ABSTRACT
Abstract
Provided is a secondary battery, where a positive electrode includes a first covered part covered with a positive electrode active material layer and a positive electrode active material non-covered part on a positive electrode foil, and a negative electrode includes a second covered part covered with a negative electrode active material layer and a negative electrode active material non-covered part on a negative electrode foil, the positive electrode active material non-covered part is joined to the positive electrode current-collecting plate at one end of an electrode wound body, and the negative electrode active material non-covered part is joined to the negative electrode current-collecting plate at the other end of the electrode wound body.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
The present application is a continuation of PCT patent application no. PCT/JP2020/028295, filed on Jul. 21, 2020, which claims priority to Japanese patent application no. JP2019-139813 filed on Jul. 30, 2019, the entire contents of which are being incorporated herein by reference.
BACKGROUND
The present disclosure generally relates to a secondary battery, a battery pack, an electronic device, an electric tool, an electric aircraft, and an electric vehicle.
Lithium ion batteries have been developed for applications that require high power, such as electric tools and automobiles. Methods for achieving high power include a method of high-rate discharge for the flow of a relatively large current from a battery. The high-rate discharge has a problem with the internal resistance of the battery, because of the flow of the large current.
SUMMARY
The present disclosure generally relates to a secondary battery, a battery pack, an electronic device, an electric tool, an electric aircraft, and an electric vehicle.
The conventional battery technology, for example, has a problem in that, because welding points are denser toward the center in order to collect current from the whole wound foil ends, simply folding and overlapping the foil produces a region with less overlap of the foils on the center side of the electrode assembly, which is perforated at the time of welding. Moreover, another problem is that a sufficient space is required in the central part of the electrode assembly at the time of can bottom welding in the assembly process, and when the foil is folded from the outer periphery toward the central part, the central space formed at the time of the winding is blocked, thereby failing to achieve the assembly.
Accordingly, an object of the present disclosure is to provide a battery for high-rate discharge, which can be reliably welded.
For solving the above-described problems, the present disclosure provides a secondary battery according to an embodiment including: an electrode wound body that has a positive electrode and a negative electrode stacked with a separator interposed therebetween and has a wound structure; and a positive electrode current-collecting plate and a negative electrode current-collecting plate, accommodated in an exterior can,
where the positive electrode includes a first covered part covered with a positive electrode active material layer and a positive electrode active material non-covered part on a positive electrode foil,
the negative electrode includes a second covered part covered with a negative electrode active material layer and a negative electrode active material non-covered part on a negative electrode foil,
the positive electrode active material non-covered part is joined to the positive electrode current-collecting plate at one end of the electrode wound body,
the negative electrode active material non-covered part is joined to the negative electrode current-collecting plate at the other end of the electrode wound body,
one or both of the positive electrode active material non-covered part and the negative electrode active material non-covered part have a surface formed by bending toward the central axis of the wound structure and overlapping each other, and
at least parts of the active material non-covered parts near the central axis are multiply bent in the case of observing sections of the active material non-covered parts in the plane including the central axis.
Further, the present disclosure provides a battery pack including:
the secondary battery as described herein;
a controller configured to control the secondary battery; and
an exterior body that encloses the secondary battery.
The present disclosure provides an electronic device including the secondary battery as described herein or the battery pack as described herein.
The present disclosure provides an electric tool according to an embodiment including the battery pack described above, which is configured to use the battery pack as a power supply.
The present disclosure provides an electric aircraft according to an embodiment including:
the battery pack as described herein;
a plurality of rotor blades;
a motor that rotates each of the rotor blades;
a support shaft that supports each of the rotor blades and the motor;
a motor controller configured to control rotation of the motor; and
a power supply line that supplies power to the motor,
where the battery pack is connected to the power supply line.
The present disclosure provides an electric vehicle according to an embodiment including the secondary battery described above, including
a conversion device that receives power supply from the secondary battery to convert the power to a driving force for the electric vehicle, and
a controller configured to perform information processing related to vehicle control, based on information on the second battery.
According to at least an embodiment of the present disclosure, the foil and the current-collecting plate can be reliably welded, the internal resistance of the battery can be reduced, or a high-power battery can be achieved.
It is to be noted that the contents of the present disclosure are not to be construed as being limited by the effects illustrated in this specification. It should be understood that the effects described in the present specification are only examples, and additional effects may be further provided.
BRIEF DESCRIPTION OF THE FIGURES
FIG. 1 is a sectional view of a battery according to an embodiment of the present disclosure.
FIG. 2 is a diagram illustrating an example of a relationship among a positive electrode, a negative electrode, and a separator disposed in an electrode wound body according to an embodiment of the present disclosure.
FIG. 3A is a plan view of a positive electrode current-collecting plate according to an embodiment of the present disclosure, and FIG. 3B is a plan view of a negative electrode current-collecting plate according to an embodiment of the present disclosure.
FIG. 4A to 4F are diagrams illustrating a process for assembling a battery according to an embodiment of the present disclosure.
FIG. 5 is a front view and a bottom view of a jig for use in an example according to an embodiment.
FIG. 6 is a front view of another jig for in an example according to an embodiment of the present disclosure.
FIG. 7A is a view illustrating an end surface according to an embodiment of the present disclosure, and FIG. 7B is a schematic view of a section taken along a broken line AA' in FIG. 7A .
FIG. 8A is a view illustrating an end surface according to a comparative example, and FIG. 8B is a schematic view of a section taken along a broken line BBâ² in FIG. 8A .
FIG. 9 is a connection diagram for use in description of a battery pack as an application example according to an embodiment of the present disclosure.
FIG. 10 is a connection diagram for use in description of an electric tool as an application example according to an embodiment of the present disclosure.
FIG. 11 is a connection diagram for use in description of an unmanned aircraft as an application example according to an embodiment of the present disclosure.
FIG. 12 is a connection diagram for use in description of an electric vehicle as an application example according to an embodiment of the present disclosure.
DETAILED DESCRIPTION
As described herein, the present disclosure will be described based on examples with reference to the drawings, but the present disclosure is not to be considered limited to the examples, and various numerical values and materials in the examples are considered by way of example.
In the embodiment of the present disclosure, a cylindrical lithium ion battery will be described as an example of the secondary battery. Obviously, any battery other than the lithium ion battery or a battery that has any shape other than the cylindrical shape may be used.
First, the overall configuration of the lithium ion battery will be described. FIG. 1 is a schematic sectional view of a lithium ion battery 1 . The lithium ion battery 1 is, for example, a cylindrical lithium ion battery 1 that has an electrode wound body 20 is housed inside an exterior can 11 as shown in FIG. 1 .
Specifically, the lithium ion battery 1 includes, for example, a pair of insulating plates
12 and 13 and an electrode wound body 20 inside the cylindrical exterior can 11 . The lithium ion battery 1 may further, however, include, for example, any one of, or two or more of a positive temperature coefficient (PTC) element, a reinforcing member, and the like inside the exterior can 11 .
The exterior can 11 is a member that mainly houses the electrode wound body 20 . The exterior can 11 is, for example, a cylindrical container with one end thereof opened and the other end thereof closed. More specifically, the exterior can 11 has an opened end ( open end 11 N). The exterior can 11 contains, for example, any one of, or two or more of metal materials such as iron, aluminum, and alloys thereof. The surface of the exterior can 11 may be, however, plated with, for example, any one of, or two or more of metal materials such as nickel.
Each of the insulating plates
12 and 13 is, for example, a dish-shaped plate that has a surface perpendicular to the winding axis of the electrode wound body 20 , that is, a surface perpendicular to the Z axis in FIG. 1 . In addition, the insulating plates
12 and 13 are disposed so as to sandwich the electrode wound <figure-callout id="20" label="body" filenames="US20220149444A1-20220512-D00000.png,US20220149444A1-202205
CROSS REFERENCE TO RELATED APPLICATIONS
The present application is a continuation of PCT patent application no. PCT/JP2020/028295, filed on Jul. 21, 2020, which claims priority to Japanese patent application no. JP2019-139813 filed on Jul. 30, 2019, the entire contents of which are being incorporated herein by reference.
BACKGROUND
The present disclosure generally relates to a secondary battery, a battery pack, an electronic device, an electric tool, an electric aircraft, and an electric vehicle.
Lithium ion batteries have been developed for applications that require high power, such as electric tools and automobiles. Methods for achieving high power include a method of high-rate discharge for the flow of a relatively large current from a battery. The high-rate discharge has a problem with the internal resistance of the battery, because of the flow of the large current.
SUMMARY
The present disclosure generally relates to a secondary battery, a battery pack, an electronic device, an electric tool, an electric aircraft, and an electric vehicle.
The conventional battery technology, for example, has a problem in that, because welding points are denser toward the center in order to collect current from the whole wound foil ends, simply folding and overlapping the foil produces a region with less overlap of the foils on the center side of the electrode assembly, which is perforated at the time of welding. Moreover, another problem is that a sufficient space is required in the central part of the electrode assembly at the time of can bottom welding in the assembly process, and when the foil is folded from the outer periphery toward the central part, the central space formed at the time of the winding is blocked, thereby failing to achieve the assembly.
Accordingly, an object of the present disclosure is to provide a battery for high-rate discharge, which can be reliably welded.
For solving the above-described problems, the present disclosure provides a secondary battery according to an embodiment including: an electrode wound body that has a positive electrode and a negative electrode stacked with a separator interposed therebetween and has a wound structure; and a positive electrode current-collecting plate and a negative electrode current-collecting plate, accommodated in an exterior can,
where the positive electrode includes a first covered part covered with a positive electrode active material layer and a positive electrode active material non-covered part on a positive electrode foil,
the negative electrode includes a second covered part covered with a negative electrode active material layer and a negative electrode active material non-covered part on a negative electrode foil,
the positive electrode active material non-covered part is joined to the positive electrode current-collecting plate at one end of the electrode wound body,
the negative electrode active material non-covered part is joined to the negative electrode current-collecting plate at the other end of the electrode wound body,
one or both of the positive electrode active material non-covered part and the negative electrode active material non-covered part have a surface formed by bending toward the central axis of the wound structure and overlapping each other, and
at least parts of the active material non-covered parts near the central axis are multiply bent in the case of observing sections of the active material non-covered parts in the plane including the central axis.
Further, the present disclosure provides a battery pack including:
the secondary battery as described herein;
a controller configured to control the secondary battery; and
an exterior body that encloses the secondary battery.
The present disclosure provides an electronic device including the secondary battery as described herein or the battery pack as described herein.
The present disclosure provides an electric tool according to an embodiment including the battery pack described above, which is configured to use the battery pack as a power supply.
The present disclosure provides an electric aircraft according to an embodiment including:
the battery pack as described herein;
a plurality of rotor blades;
a motor that rotates each of the rotor blades;
a support shaft that supports each of the rotor blades and the motor;
a motor controller configured to control rotation of the motor; and
a power supply line that supplies power to the motor,
where the battery pack is connected to the power supply line.
The present disclosure provides an electric vehicle according to an embodiment including the secondary battery described above, including
a conversion device that receives power supply from the secondary battery to convert the power to a driving force for the electric vehicle, and
a controller configured to perform information processing related to vehicle control, based on information on the second battery.
According to at least an embodiment of the present disclosure, the foil and the current-collecting plate can be reliably welded, the internal resistance of the battery can be reduced, or a high-power battery can be achieved.
It is to be noted that the contents of the present disclosure are not to be construed as being limited by the effects illustrated in this specification. It should be understood that the effects described in the present specification are only examples, and additional effects may be further provided.
BRIEF DESCRIPTION OF THE FIGURES
FIG. 1 is a sectional view of a battery according to an embodiment of the present disclosure.
FIG. 2 is a diagram illustrating an example of a relationship among a positive electrode, a negative electrode, and a separator disposed in an electrode wound body according to an embodiment of the present disclosure.
FIG. 3A is a plan view of a positive electrode current-collecting plate according to an embodiment of the present disclosure, and FIG. 3B is a plan view of a negative electrode current-collecting plate according to an embodiment of the present disclosure.
FIG. 4A to 4F are diagrams illustrating a process for assembling a battery according to an embodiment of the present disclosure.
FIG. 5 is a front view and a bottom view of a jig for use in an example according to an embodiment.
FIG. 6 is a front view of another jig for in an example according to an embodiment of the present disclosure.
FIG. 7A is a view illustrating an end surface according to an embodiment of the present disclosure, and FIG. 7B is a schematic view of a section taken along a broken line AA' in FIG. 7A .
FIG. 8A is a view illustrating an end surface according to a comparative example, and FIG. 8B is a schematic view of a section taken along a broken line BBâ² in FIG. 8A .
FIG. 9 is a connection diagram for use in description of a battery pack as an application example according to an embodiment of the present disclosure.
FIG. 10 is a connection diagram for use in description of an electric tool as an application example according to an embodiment of the present disclosure.
FIG. 11 is a connection diagram for use in description of an unmanned aircraft as an application example according to an embodiment of the present disclosure.
FIG. 12 is a connection diagram for use in description of an electric vehicle as an application example according to an embodiment of the present disclosure.
DETAILED DESCRIPTION
As described herein, the present disclosure will be described based on examples with reference to the drawings, but the present disclosure is not to be considered limited to the examples, and various numerical values and materials in the examples are considered by way of example.
In the embodiment of the present disclosure, a cylindrical lithium ion battery will be described as an example of the secondary battery. Obviously, any battery other than the lithium ion battery or a battery that has any shape other than the cylindrical shape may be used.
First, the overall configuration of the lithium ion battery will be described. FIG. 1 is a schematic sectional view of a lithium ion battery 1 . The lithium ion battery 1 is, for example, a cylindrical lithium ion battery 1 that has an electrode wound body 20 is housed inside an exterior can 11 as shown in FIG. 1 .
Specifically, the lithium ion battery 1 includes, for example, a pair of insulating plates
12 and 13 and an electrode wound body 20 inside the cylindrical exterior can 11 . The lithium ion battery 1 may further, however, include, for example, any one of, or two or more of a positive temperature coefficient (PTC) element, a reinforcing member, and the like inside the exterior can 11 .
The exterior can 11 is a member that mainly houses the electrode wound body 20 . The exterior can 11 is, for example, a cylindrical container with one end thereof opened and the other end thereof closed. More specifically, the exterior can 11 has an opened end ( open end 11 N). The exterior can 11 contains, for example, any one of, or two or more of metal materials such as iron, aluminum, and alloys thereof. The surface of the exterior can 11 may be, however, plated with, for example, any one of, or two or more of metal materials such as nickel.
Each of the insulating plates
12 and 13 is, for example, a dish-shaped plate that has a surface perpendicular to the winding axis of the electrode wound body 20 , that is, a surface perpendicular to the Z axis in FIG. 1 . In addition, the insulating plates
12 and 13 are disposed so as to sandwich the electrode wound body 20 therebetween, for example.
The open end 11 N of the exterior can 11 has, for example, a battery cover 14 and a safety valve mechanism 30 are crimped with a gasket 15 . The battery cover 14 serves as a âcover memberâ according to an embodiment of the present disclosure, and the gasket 15 serves as a âsealing memberâ according to an embodiment of the present disclosure. Thus, with the electrode wound body 20 and the like housed inside the exterior can 11 , the exterior can 11 is sealed. Accordingly, the open end 11 N of the exterior can 11 has a crimped structure (crimped structure 11 R) formed by the battery cover 14 and the safety valve mechanism 30 crimped with the gasket 15 . More specifically, a bent part 11 P is a so-called crimp part, and the crimped structure 11 R is a so-called crimp structure.
The battery cover 14 is a member that closes the open end 11 N of the exterior can 11 mainly with the electrode wound body 20 and the like housed inside the exterior can 11 . The battery cover 14 contains, for example, the same material as the material that forms the exterior can 11 . The central region of the battery cover 14 protrudes in the +Z direction, for example. Thus, the region (peripheral region) of the battery cover 14 other than the central region has contact with, for example, the safety valve mechanism 30 .
The gasket 15 is a member mainly interposed between the exterior can 11 ( bent part 11 P) and the battery cover 14 to seal the gap between the bent part 11 P and the battery cover 14 . For example, asphalt or the like may be, however, applied to the surface of the gasket 15 .
The gasket 15 contains, for example, any one of, or two or more of insulating materials. The types of the insulating materials are not particularly limited, and may be, for example, a polymer material such as a polybutylene terephthalate (PBT) and a polypropylene (PP). In particular, the insulating material is preferably a polybutylene terephthalate. This is because the gap between the bent part 11 P and the battery cover 14 is sufficiently sealed while the exterior can 11 and the battery cover 14 are electrically separated from each other.
The safety valve mechanism 30 mainly releases the sealed state of the exterior can 11 to release the pressure (internal pressure) inside the exterior can 11 , if necessary, when the internal pressure is increased. The cause of the increase in the internal pressure of exterior can 11 is, for example, a gas generated due to a decomposition reaction of an electrolytic solution during charging or discharging.
For the cylindrical lithium ion battery, a band-shaped positive electrode 21 and a band-shaped negative electrode 22 are spirally wound with a separator 23 interposed therebetween, impregnated with an electrolytic solution, and housed in the exterior can 11 . The positive electrode 21 is obtained by forming a positive electrode active material layer 21 B on one or both surfaces of a positive electrode foil 21 A, and the material of the positive electrode foil 21 A is, for example, a metal foil made of aluminum or an aluminum alloy. The negative electrode 22 is obtained by forming a negative electrode active material layer 22 B on one or both surfaces of a negative electrode foil 22 A, and the material of the negative electrode foil 22 A is, for example, a metal foil made of nickel, a nickel alloy, copper, or a copper alloy. The separator 23 is a porous and insulating film, which enables transfer of substances such as ions and an electrolytic solution while electrically insulating the positive electrode 21 and the negative electrode 22 .
The positive electrode active material layer 21 B and the negative electrode active material layer 22 B respectively cover most of the positive electrode foil 21 A and the negative electrode foil 22 A, but intentionally, neither of the layers covers one end periphery in the short axis direction of the band. Hereinafter, the part covered with no active material layer
21 B or 22 B is appropriately referred to as an active material non-covered part. In the cylindrical battery, the electrode wound body 20 is wound in such a manner that an active material non-covered part 21 C of the positive electrode and an active material non-covered part 22 C of the negative electrode are overlapped with each other with the separator 23 interposed therebetween so as to face in opposite directions.
FIG. 2 shows an example of a structure with the positive electrode 21 , the negative electrode 22 , and the separator 23 stacked before winding. The active material non-covered part 21 C (the upper hatched part in FIG. 2 ) of the positive electrode has a width denoted by A, and the active material non-covered part 22 C (the lower hatched part in FIG. 2 ) of the negative electrode has a width denoted by B. According to one embodiment, A>B is preferred, for example, A=7 (mm) and B=4 (mm). A part of the active material non-covered part 21 C of the positive electrode, protruded from one end of the separator 23 in the width direction, has a length denoted by C, and a part of the active material non-covered part 22 C of the negative electrode, protruded from the other end of the separator 23 in the width direction, has a length denoted by D. According to one embodiment, C>D is preferred, for example, C=4.5 (mm) and D=3 (mm).
The active material non-covered part 21 C of the positive electrode is made of, for example, aluminum, whereas the active material non-covered part 22 C of the negative electrode is made of, for example, copper, and thus, the active material non-covered part 21 C of the positive electrode is typically softer (has a lower Young's modulus) than the active material non-covered part 22 C of the negative electrode. Thus, according to one embodiment, A>B and C>D are more preferred, and in this case, when the active material non-covered part 21 C of the positive electrode and the active material non-covered part 22 C of the negative electrode are bent at the same pressure simultaneously from both electrode sides, the positive electrode 21 and the negative electrode 22 may be similar in the height of the bent part, measured from the tip of the separator 23 . In this case, the active material non-covered parts
21 C and 22 C are bent to appropriately overlap with each other, thus allowing the active material non-covered parts
21 C and 22 C and current-collecting plates
24 and 25 to be easily joined by laser welding. Joining according to one embodiment means joining by laser welding, but the joining method is not limited to laser welding.
For the positive electrode 21 , a section of 3 mm in width, including the boundary between the active material non-covered part 21 C and the active material covered part 21 B, is coated with an insulating layer 101 (gray region part in FIG. 2 ). Further, the whole region of the active material non-covered part 21 C of the positive electrode, opposed the active material covered part 22 B of the negative electrode with the separator interposed therebetween, is covered with the insulating layer 101 . The insulating layer 101 has the effect of reliably preventing any internal short circuit of the battery 1 if any foreign matter enters between the active material covered part 22 B of the negative electrode and the active material non-covered part 21 C of the positive electrode. In addition, the insulating layer 101 has the effect of, when an impact is applied to the battery 1 , absorbing the impact and reliably preventing the active material non-covered part 21 C of the positive electrode from being bent or short-circuited with the negative electrode 22 .
The central axis of the electrode wound body 20 has a through hole 26 formed. The through hole 26 is a hole for insertion of a winding core for assembling the electrode wound body 20 and an electrode rod for welding. The electrode wound body 20 is wound in an overlapping manner such that the active material non-covered part 21 C of the positive electrode and the active material non-covered part 22 C of the negative electrode face in the opposite directions, and thus, the active material non-covered part 21 C of the positive electrode is gathered at one (end 41 ) of the ends of the electrode wound body, whereas the active material non-covered part 22 C of the negative electrode is gathered at the other (end 42 ) of the ends of the electrode wound body 20 . For improving contact with the current-collecting plates
24 and 25 for current extraction, the active material non-covered parts
21 C and 22 C are bent, and the ends
41 and 42 form flat surfaces. The bending directions are directions from the outer edges
27 and 28 of the ends
41 and 42 toward the through hole 26 , and peripheral active material non-covered parts that are adjacent in the wound state are bent in a manner of overlapping with each other. It is to be noted that the surface may be a flat surface or a surface with a raised part. In any case, the surface has only to be a smooth surface to the extent that the joint to the current-collecting plate is not affected if the surface has some unevenness. Hereinafter, a flat surface will be described as an example.
When each of the active material non-covered parts
21 C and 22 C are bent so as to have an overlap, it seems possible for the ends
41 and 42 to have flat surfaces, but if no processing is performed before bending, wrinkles or voids (voids, spaces) are generated at the ends
41 and 42 at the time of bending. In this regard, the âwrinklesâ or âvoidsâ are portions where the bent active material non-covered parts
21 C and 22 C are biased, thereby causing the ends 41 and 42 to have no flat surfaces. For preventing the generation of wrinkles and voids, grooves 43 (see, for example, FIG. 4B ) are formed in radiation directions from the through hole 26 . The groove 43 extends from the outer edges
27 and 28 of the ends
41 and 42 to the through hole 26 in the central axis. The central axis of the electrode wound body 20 has the through hole 26 , and the through hole 26 is used as a hole into which a welding tool is inserted in the process of assembling the lithium ion battery 1 . The grooves 43 remain in the flat surfaces also after bending the active material non-covered parts
21 C and 22 C, and parts without the grooves 43 are joined (welded or the like) to the positive electrode current-collecting plate 24 or the negative electrode current-collecting plate 25 . It is to be noted that the grooves 43 as well as the flat surfaces may be joined to a part of the current-collecting plates
24 and 25 .
The detailed configuration of the electrode wound body 20 , that is, the respective detailed configuration of the positive electrode 21 , negative electrode 22 , separator 23 , and electrolytic solution will be described later.
In a common lithium ion battery, for example, a lead for current extraction is welded to each one of the positive electrode and negative electrode, but this is not suitable for high-rate discharge because of the high internal resistance of the battery and the temperature increased by heat generation of the lithium ion battery in the case of discharging. Thus, in the lithium ion battery according to one embodiment, the internal resistance of the battery is kept low by disposing the positive electrode current-collecting plate 24 and the negative electrode current-collecting plate 25 at the ends
41 and 42 , and welding at multiple points to the active material non-covered parts
21 C and 22 C of the positive electrode and negative electrode present at the ends
41 and 42 . The ends 41 and 42 are bent to form flat surfaces, which also contributes to the reduction in resistance.
FIG. 3A and FIG. 3B show examples of the current collecting plates. FIG. 3A shows the positive electrode current-collecting plate 24 , and FIG. 3B shows the negative electrode current-collecting plate 25 . The material of the positive electrode current-collecting plate 24 is, for example, a metal plate made of a simple substance of aluminum or an aluminum alloy or a composite thereof, and the mater
CLAIMS
Claims ( 20 )
1 . A secondary battery comprising:
an electrode wound body that has a positive electrode and a negative electrode stacked with a separator interposed therebetween and has a wound structure; and a positive electrode current-collecting plate and a negative electrode current-collecting plate, wherein the electrode wound body, the positive electrode current-collecting plate and the negative electrode current-collecting plate are accommodated in an exterior can, wherein the positive electrode includes a first covered part covered with a positive electrode active material layer and a positive electrode active material non-covered part on a positive electrode foil, the negative electrode includes a second covered part covered with a negative electrode active material layer and a negative electrode active material non-covered part on a negative electrode foil, the positive electrode active material non-covered part is joined to the positive electrode current-collecting plate at one end of the electrode wound body, the negative electrode active material non-covered part is joined to the negative electrode current-collecting plate at the other end of the electrode wound body, one or both of the positive electrode active material non-covered part and the negative electrode active material non-covered part have a surface formed by bending toward a central axis of the wound structure and overlapping each other, and at least parts of the active material non-covered parts near the central axis are multiply bent in a case of observing sections of the active material non-covered parts in a plane including the central axis.
2 . The secondary battery according to claim 1 , wherein a number of the active material non-covered parts multiply bent near the central axis is 5 or more counted from the central axis.
3 . The secondary battery according to claim 1 , wherein a number of the active material non-covered parts multiply bent near the central axis is 15 or less counted from the central axis.
4 . The secondary battery according to claim 2 , wherein a number of the active material non-covered parts multiply bent near the central axis is 15 or less counted from the central axis.
5 . The secondary battery according to claim 1 , wherein the active material non-covered parts multiply bent is in a region that has a depth of 0.1 mm or more and 1.5 mm or less from the surface.
6 . The secondary battery according to claim 2 , wherein the active material non-covered parts multiply bent is in a region that has a depth of 0.1 mm or more and 1.5 mm or less from the surface.
7 . The secondary battery according to claim 3 , wherein the active material non-covered parts multiply bent is in a region that has a depth of 0.1 mm or more and 1.5 mm or less from the surface.
8 . The secondary battery according to claim 1 , wherein the surface has a groove.
9 . The secondary battery according to claim 1 , wherein the surface includes a flat surface or a surface with a raised part.
10 . The secondary battery according to claim 1 , wherein
a width of the positive electrode active material non-covered part is larger than a width of the negative electrode active material non-covered part, an end of the positive electrode active material non-covered part and an end of the negative electrode active material non-covered part is protruded outward from the separator, and a length of a part of the positive electrode active material non-covered part protruded from one end of the separator in a width direction is larger than a length of a part of the negative electrode active material non-covered part protruded from the other end of the separator in the width direction.
11 . The secondary battery according to claim 1 , wherein a part of the positive electrode active material non-covered part that faces the negative electrode with the separator interposed therebetween has an insulating layer.
12 . The secondary battery according to claim 1 , wherein a material of the positive electrode foil includes aluminum or an aluminum alloy.
13 . The secondary battery according to claim 1 , wherein a material of the negative electrode foil includes a simple substance of nickel, a nickel alloy, copper, a copper alloy, or a composite thereof.
14 . A battery pack comprising:
the secondary battery according to claim 1 ; a controller configured to control the secondary battery; and an exterior body that encloses the secondary battery.
15 . An electronic device comprising the secondary battery according to claim 1 .
16 . An electronic device comprising the battery pack according to claim 14 .
17 . An electric tool comprising the battery pack according to claim 14 ,
wherein the electric tool is configured to use the battery pack as a power supply.
18 . An electric aircraft comprising:
the battery pack according to claim 14 ; a plurality of rotor blades; a motor that rotates each of the rotor blades; a support shaft that supports each of the rotor blades and the motor; a motor controller configured to control rotation of the motor; and a power supply line that supplies power to the motor, wherein the battery pack is connected to the power supply line.
19 . The electric aircraft according to claim 18 , comprising:
a plurality of pairs of the rotor blades facing each other; and a plurality of the battery packs, wherein the plurality of pairs of rotor blades and the plurality of battery packs are equal in number.
20 . An electric vehicle including the secondary battery according to claim 1 , comprising:
a conversion device that receives power supply from the secondary battery to convert the power to a driving force for the electric vehicle; and a controller configured to perform information processing related to vehicle control, based on information on the second battery.
US17/581,286
2019-07-30
2022-01-21
Secondary battery, battery pack, electronic device, electric tool, electric aircraft, and electric vehicle
Active
2042-11-01
US12620597B2
( en )
Applications Claiming Priority (3)
Application Number
Priority Date
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JP2019139813
2019-07-30
JP2019-139813
2019-07-30
PCT/JP2020/028295
WO2021020237A1
( en )
2019-07-30
2020-07-21
Secondary battery, battery pack, electronic device, electric tool, electric airplane and electric vehicle
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Title
Priority Date
Filing Date
PCT/JP2020/028295
Continuation
WO2021020237A1
( en )
2019-07-30
2020-07-21
Secondary battery, battery pack, electronic device, electric tool, electric airplane and electric vehicle
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Publication Date
US20220149444A1
true
US20220149444A1 ( en )
2022-05-12
US12620597B2
US12620597B2 ( en )
2026-05-05
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Secondary battery, battery pack, electronic device, electric tool, electric aircraft, and electric vehicle
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( en )
2022-03-01
JPWO2021020237A1
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2024-03-29
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