Current collector and battery

Abstract

The invention provides a current collector and a battery. The current collector includes a support layer, a conductive layer, and a tab portion. The support layer is configured from a resin composition having electrical insulating properties. The conductive layer is laminated on the support layer. The tab portion is configured from a film-like member. The tab part comprises a tab main body part and a heat dissipation part; the tab main body part is connected to the conductive layer. The tab main body portion is configured to be capable of being joined to another conductive member so as to be electrically connected to the other conductive member. The heat dissipation part is bent for multiple times.

Description

Technical Field

[0001] This disclosure relates to current collectors and batteries. Background Technology

[0002] Japanese Patent Application Publication No. 2024-510696 discloses a conventional electrode plate. The electrode plate includes a current collector, an active material layer, and electrical connection components. The current collector includes a support layer and a conductive layer. The support layer is made of insulating material. The conductive layer is disposed on one surface of the support layer. The electrical connection components are welded to the current collector at the edge of the current collector. This welded connection area is called the relay welding area. Summary of the Invention

[0003] In traditional current collectors, the support layer is made of insulating material. Therefore, the current collector has relatively high resistance. This makes the welding area prone to overheating when energized.

[0004] This disclosure is made in view of the above-mentioned problems, and its purpose is to provide a current collector capable of suppressing local heating and a battery having the current collector.

[0005] One aspect of the current collector disclosed herein includes a support layer, a conductive layer, and a tab portion. The support layer is composed of a resin composition having electrical insulating properties. The conductive layer is laminated onto the support layer. The tab portion is composed of a film-like component. The tab portion includes a tab body portion and a heat dissipation portion. The tab body portion is connected to the conductive layer. The tab body portion is configured to be able to engage with other conductive components to conduct electricity with other conductive components. The heat dissipation portion is bent multiple times.

[0006] A battery according to one aspect of this disclosure includes an electrode body and external terminals. The electrode body includes a first electrode, a second electrode, and a separator. The first electrode includes a current collector and an active material layer. The current collector includes a support layer, a conductive layer, and a tab portion. The support layer is composed of a resin composition having electrical insulating properties. The conductive layer is laminated on the support layer. The tab portion is composed of a film-like component. The tab portion includes a tab body portion and a heat dissipation portion. The tab body portion is connected to the conductive layer. The tab body portion is configured to be able to engage with other conductive components to conduct electricity with other conductive components. The heat dissipation portion is bent multiple times. The active material layer is laminated on the conductive layer. The separator is laminated on the active material layer. The second electrode is laminated on the active material layer via the separator. The external terminals are electrically connected to the tab body portion.

[0007] According to this disclosure, it is possible to suppress localized heating of the current collector. Attached Figure Description

[0008] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, wherein like reference numerals denote like elements, and wherein:

[0009] Figure 1This is a cross-sectional view showing the battery of Embodiment 1.

[0010] Figure 2 It is observed along the direction of the arrow on line II-II. Figure 1 A cross-sectional view of the electrode body.

[0011] Figure 3 This is a unfolded view of the first electrode in Embodiment 1.

[0012] Figure 4 This is a diagram showing the tab of the first electrode in Embodiment 1 as viewed from one direction.

[0013] Figure 5 It is observed along the direction of the arrow on the VV line. Figure 3 A partial cross-sectional view of the first electrode.

[0014] Figure 6 Observe along the direction of the arrow on line VI-VI. Figure 3 A partial cross-sectional view of the first electrode.

[0015] Figure 7 This is a unfolded view of the first electrode in Embodiment 2.

[0016] Figure 8 It is observed along the direction of the arrow on line VIII-VIII. Figure 7 A partial cross-sectional view of the first electrode. Detailed Implementation

[0017] Hereinafter, with reference to the accompanying drawings, the current collector and battery of various embodiments of the present disclosure will be described. The same or equivalent parts in the drawings will be labeled with the same reference numerals, and their descriptions will not be repeated.

[0018] (Implementation Method 1)

[0019] Figure 1 This is a cross-sectional view showing the battery of Embodiment 1. Figure 1 The battery 1 shown is a so-called square battery. Battery 1 can be a rechargeable battery such as a lithium-ion battery or a nickel-metal hydride battery. Battery 1 can be used, for example, as a single cell included in an energy storage module mounted in an electric vehicle.

[0020] like Figure 1 As shown, the battery 1 of Embodiment 1 of this disclosure includes an electrode body 10, a housing 20, a first external terminal 30A, a second external terminal 30B, a first connecting member 40A, and a second connecting member 40B. First, the structure of the battery 1 other than the electrode body 10 will be described.

[0021] The housing 20 is conductive. The conductive parts of the housing 20 are made of a metal such as aluminum. The housing 20 houses the electrode body 10. The housing 20 also houses the electrolyte (not shown in the illustration).

[0022] The housing 20 includes a housing body 21 and a cover 22. The housing body 21 includes a bottom wall 21a and a peripheral wall 21b rising from the bottom wall 21a.

[0023] The cover 22 is joined to the peripheral wall 21b by welding or the like in a manner that closes the opening of the peripheral wall 21b. The cover 22 has a first connecting hole 22a and a second connecting hole 22b.

[0024] The first external terminal 30A and the second external terminal 30B are exposed to the outside of the battery 1. The first connecting member 40A and the second connecting member 40B are conductive. At least a portion of the first connecting member 40A and the second connecting member 40B are disposed inside the housing 20.

[0025] The first external terminal 30A or the first connecting member 40A is inserted into the first connecting hole 22a. The first external terminal 30A and the first connecting member 40A are electrically connected. Specifically, the first external terminal 30A and the first connecting member 40A are engaged with each other. The first connecting member 40A is engaged with the electrode body 10. Thus, the first external terminal 30A is electrically connected to the electrode body 10.

[0026] The second external terminal 30B or the second connecting member 40B is inserted into the second connecting hole 22b. The second external terminal 30B and the second connecting member 40B are electrically connected. Specifically, the second external terminal 30B and the second connecting member 40B are engaged with each other. The second connecting member 40B is engaged with the electrode body 10. Thus, the second external terminal 30B is electrically connected to the electrode body 10.

[0027] It should be noted that, in this embodiment, the first external terminal 30A is the positive terminal and the second external terminal 30B is the negative terminal. The first external terminal 30A and the second external terminal 30B are arranged along the second direction D2. The second direction D2 is orthogonal to the first direction D1.

[0028] Next, the electrode bodies 10 will be described. The battery 1 of this embodiment includes a plurality of electrode bodies 10. The battery 1 typically includes two electrode bodies 10. These electrode bodies 10 are arranged along a third direction D3. The third direction D3 is a direction orthogonal to both the first direction D1 and the second direction D2.

[0029] The following describes one of the plurality of electrode bodies 10. It should be noted that the plurality of electrode bodies 10 may each have the structure shown below.

[0030] Figure 2 It is observed along the direction of the arrow on line II-II. Figure 1 A cross-sectional view of the electrode body. (e.g.) Figure 1 and Figure 2As shown, the electrode body 10 includes a first electrode 11A, a second electrode 11B, and a diaphragm 12. In the electrode body 10, the first electrode 11A, the second electrode 11B, and the diaphragm 12 are wound around the winding axis Z. Thus, in this embodiment, the electrode body 10 is a so-called wound electrode body. However, the electrode body 10 may also be a stacked electrode body formed by stacking the first electrode 11A, the second electrode 11B, and the diaphragm 12 in one direction (e.g., the third direction D3). It should be noted that... Figure 2 In the diagram, diaphragm 12 is schematically represented by a dashed line.

[0031] The first electrode 11A and the second electrode 11B have a sheet-like shape. The electrode body 10 is composed of an electrode plate assembly formed by winding the first electrode 11A and the second electrode 11B with one or more diaphragms 12 in between. In this embodiment, the first electrode 11A is the positive electrode and the second electrode 11B is the negative electrode. However, it is also possible for the first electrode 11A to be the negative electrode and the second electrode 11B to be the positive electrode.

[0032] A diaphragm 12 is disposed between the first electrode 11A and the second electrode 11B. The diaphragm 12 allows ions to pass between the first electrode 11A and the second electrode 11B, while separating the first electrode 11A from the second electrode 11B. The ions are, for example, lithium ions. The diaphragm 12 is electrically insulating.

[0033] Figure 3 This is a unfolded view of the first electrode in Embodiment 1. That is, in Figure 3 The image shows the state of the first electrode 11A before it was wound up. Figure 4 This is a diagram showing the tab of the first electrode in Embodiment 1 as viewed from one direction. Figure 5 It is observed along the direction of the arrow on the VV line. Figure 3 A partial cross-sectional view of the first electrode. Figure 6 Observe along the direction of the arrow on line VI-VI. Figure 3 A partial cross-sectional view of the first electrode.

[0034] like Figures 2-6 As shown, the first electrode 11A includes a first current collector 100A, a first active material layer 200A, a first protective part 400, and a second protective part 500.

[0035] The first current collector 100A includes a support layer 110, a first conductive layer 120, a second conductive layer 130, and a plurality of tabs 140.

[0036] The support layer 110 is made of an electrically insulating resin composition. Therefore, the first current collector 100A is a composite current collector composed of conductive and electrically insulating components. As a result, compared to the case where the first current collector 100A is made entirely of metal, the first current collector 100A is lighter, and the safety of the battery 1 as a whole is improved.

[0037] The support layer 110 is composed of a resin composition comprising, for example, a polyamide resin, a polyester resin, or a polyolefin resin. To improve rigidity, the support layer 110 is preferably composed of a resin composition comprising a polyester resin. The support layer 110 is substantially more preferably composed of a polyester resin. This polyester resin can be, for example, polyethylene terephthalate. This allows the electrical insulation of the support layer 110 to be maintained and the rigidity of the first current collector 100A to be improved. Furthermore, the support layer 110 can be made relatively thin.

[0038] The thickness direction DT of the support layer 110 is approximately orthogonal to the first direction D1. That is, the support layer 110 extends along a direction approximately orthogonal to the first direction D1.

[0039] To reduce the overall thickness of the electrode body 10, the thickness of the support layer 110 is preferably 20 μm or less, more preferably 15 μm or less, and even more preferably 10 μm or less. The support layer 110 only needs to have the desired rigidity, and its thickness is not particularly limited. For example, a thickness of 2 μm or more is sufficient.

[0040] A first conductive layer 120 is stacked on a support layer 110. The first conductive layer 120 is disposed on one surface of the support layer 110. The first conductive layer 120 is disposed integrally over the one surface.

[0041] In this embodiment, the first conductive layer 120 is located on the Z-side of the winding axis as viewed from the support layer 110. However, the first conductive layer 120 may also be located on the opposite side of the Z-side of the winding axis as viewed from the support layer 110.

[0042] The second conductive layer 130 is stacked on the support layer 110 on the opposite side of the first conductive layer 120. That is, the second conductive layer 130 is disposed on the other side of the support layer 110. The second conductive layer 130 is disposed integrally over this other side.

[0043] The thickness of the first conductive layer 120 and the thickness of the second conductive layer 130 are thinner than the thickness of the support layer 110. To reduce the overall thickness of the electrode body 10, the thickness of the first conductive layer 120 and the second conductive layer 130 is preferably 5 μm or less, more preferably 2 μm or less, and even more preferably 1 μm or less. To suppress excessive resistance in the first conductive layer 120 and the second conductive layer 130, the thickness of the first conductive layer 120 and the second conductive layer 130 only needs to be, for example, 0.1 μm or more. It should be noted that when the thickness of the first conductive layer 120 and the second conductive layer 130 is 5 μm or less, it is difficult to directly weld the first conductive layer 120 and the second conductive layer 130 to each other, or it is difficult to directly bond them together by ultrasonic welding.

[0044] The method for forming the first conductive layer 120 and the second conductive layer 130 is not particularly limited. Typically, the first conductive layer 120 and the second conductive layer 130 can be disposed on the support layer 110 by means of vapor deposition or the like. The first conductive layer 120 and the second conductive layer 130 can be made of metal films. In this case, the first conductive layer 120 and the second conductive layer 130 can be bonded to the support layer 110 by means of a resin adhesive.

[0045] Furthermore, typically, the first conductive layer 120 and the second conductive layer 130 are made of a metal containing aluminum. Therefore, the first current collector 100A, having the first conductive layer 120 and the second conductive layer 130, can be appropriately used as a positive current collector. It should be noted that the first current collector 100A can also be a negative current collector, and the first conductive layer 120 and the second conductive layer 130 can be made of a metal containing copper.

[0046] like Figure 3 As shown, multiple tabs 140 are arranged along the winding direction DR of the electrode body 10. The multiple tabs 140 are isolated from each other.

[0047] And, as Figure 2 As shown, multiple electrode portions 140 are arranged along a third direction D3. The multiple electrode portions 140 are joined together by means of ultrasonic bonding or the like. Furthermore, as... Figure 1 As shown, multiple electrode tabs 140 are joined to the first connecting member 40A by means of ultrasonic bonding or the like. Thus, the first external terminal 30A is electrically connected to the electrode tabs 140. The structure of each of the multiple electrode tabs 140 will be described below.

[0048] The tab portion 140 is composed of one or more membrane-like components. Typically, the tab portion 140 is composed of a metal membrane containing aluminum or copper.

[0049] like Figures 3-6 As shown, the tab portion 140 includes a tab body portion 141, multiple heat dissipation portions 142, and an auxiliary portion 145.

[0050] The tab body 141 is connected to the first conductive layer 120. Typically, the tab body 141 is directly bonded to the first conductive layer 120. The tab body 141 is bonded to the first conductive layer 120, for example, by ultrasonic welding. The tab body 141 extends on the first conductive layer 120 along a first direction D1. The tab body 141 extends away from the first conductive layer 120. The extension direction DE of the tab body 141 is substantially parallel to the first direction D1.

[0051] The tab body 141 is configured to engage with other conductive components to conduct electricity to them. In this embodiment, the tab body 141 is engaged with the first connecting member 40A via ultrasonic bonding. The tab body 141 can also be directly engaged with the first external terminal 30A.

[0052] like Figure 3 As shown, the heat dissipation portion 142 is connected to the tab body portion 141 in the winding direction DR. The heat dissipation portion 142 is formed by a component integral with the tab body portion 141. In this embodiment, the two heat dissipation portions 142 are located on both sides of the tab body portion 141 in the winding direction DR. In the extending direction DE of the tab body portion 141, the heat dissipation portion 142 is shorter than the tab body portion 141.

[0053] like Figure 6 As shown, the heat dissipation portion 142 is located on the opposite side of the support layer 110 when viewed from the first conductive layer 120. The heat dissipation portion 142 is bonded to the first conductive layer 120 by ultrasonic welding.

[0054] like Figure 4 As shown, the heat sink 142 is bent multiple times. It should be noted that the tab body 141 is not bent, or is bent fewer times than the heat sink 142. Typically, as... Figure 2 As shown, the tab body 141 is bent fewer times than the heat dissipation part 142. As a result, it is easier to join the tab body 141 with other conductive components (first connecting member 40A).

[0055] like Figure 4 and Figure 6 As shown, the heat dissipation section 142 includes multiple valley bends 143 and multiple mountain bends 144.

[0056] Multiple valley bends 143 and multiple mountain bends 144 are arranged alternately. The multiple valley bends 143 protrude towards the first conductive layer 120 in the thickness direction DT. The multiple mountain bends 144 protrude towards the opposite side of the first conductive layer 120 in the thickness direction DT. The multiple valley bends 143 extend along the extension direction DE. The multiple valley bends 143 extend integrally over the heat dissipation portion 142. The multiple mountain bends 144 extend along the extension direction DE. The multiple mountain bends 144 extend integrally over the heat dissipation portion 142. The multiple valley bends 143 are directly bonded to the first conductive layer 120 by ultrasonic bonding.

[0057] The auxiliary portion 145 is bonded to the second conductive layer 130 by ultrasonic welding. The auxiliary portion 145 extends on the second conductive layer 130 along a first direction D1. The auxiliary portion 145 extends from the second conductive layer 130 in the extension direction DE. The auxiliary portion 145 is also bonded to the tab body portion 141 and the heat dissipation portion 142 (valve fold portion 143) by ultrasonic welding. In the extension direction DE, the auxiliary portion 145 is shorter than both the tab body portion 141 and the heat dissipation portion 142 (valve fold portion 143). Furthermore, the auxiliary portion 145 is aligned with the tab body portion 141 and the heat dissipation portion 142 in the thickness direction DT. Moreover, in this embodiment, the auxiliary portion 145 is formed of a metal film separate from the tab body portion 141 and the heat dissipation portion 142.

[0058] The thickness of each of the tab body 141, heat dissipation portion 142, and auxiliary portion 145 is greater than the thickness of the first conductive layer 120 and the thickness of each of the second conductive layer 130. The thickness of each of the tab body 141, heat dissipation portion 142, and auxiliary portion 145 is preferably, for example, 20 μm or less, more preferably 15 μm or less, and even more preferably 10 μm or less. There is no particular limitation on their respective thicknesses as long as the desired rigidity is achieved. For example, a thickness of 2 μm or more is sufficient.

[0059] like Figure 2 , Figure 5 and Figure 6 As shown, a first active material layer 200A is stacked on a first conductive layer 120 and a second conductive layer 130. The first active material layer 200A is a positive electrode active material layer, but it can also be a negative electrode active material layer. The first active material layer 200A is isolated from the tab portion 140.

[0060] The diaphragm 12 is stacked radially on the first active material layer 200A with the winding axis Z as the center.

[0061] The first protective section 400 is made of electrically insulating ceramic. For example... Figure 5 and Figure 6As shown, the first protective portion 400 covers a portion of the first active material layer 200A stacked on the first conductive layer 120 along its extension direction DE. The first protective portion 400 covers the entire surface of the first conductive layer 120 between the first active material layer 200A and the tab body portion 141 and the heat dissipation portion 142. The first protective portion 400 is also partially disposed between the first conductive layer 120 and the tab body portion 141 and the heat dissipation portion 142.

[0062] The second protective portion 500 is made of electrically insulating ceramic. The second protective portion 500 covers a portion of the first active material layer 200A, which is stacked on the second conductive layer 130, along its extension direction DE. The second protective portion 500 covers the entire surface of the second conductive layer 130 between the first active material layer 200A and the auxiliary portion 145. It should be noted that the second protective portion 500 is also partially disposed between the second conductive layer 130 and the auxiliary portion 145.

[0063] like Figure 2 As shown, in the aforementioned radial direction, the second electrode 11B is stacked on the first active material layer 200A through a diaphragm 12. In this embodiment, the electrode body 10 includes multiple diaphragms 12, but may also include a single diaphragm 12.

[0064] The second electrode 11B includes a second current collector 100B and a second active material layer 200B. The second current collector 100B extends from between the second active material layers 200B toward one side in the first direction D1. The second current collector 100B is bonded to the second connecting member 40B (see reference) by ultrasonic welding. Figure 1 ).

[0065] The second current collector 100B is, for example, made of a metal film. The second current collector 100B is, for example, made of a metal containing copper. Therefore, the second current collector 100B can be appropriately used as a negative current collector. It should be noted that when the first current collector 100A is a negative current collector and the second current collector 100B is a positive current collector, the second current collector 100B may also be made of a metal containing aluminum.

[0066] The second active material layer 200B is stacked on both sides of the second current collector 100B. It should be noted that in this embodiment, the second electrode 11B is the negative electrode. Therefore, the second active material layer 200B is a negative electrode active material layer. It should also be noted that the second active material layer 200B can also be a positive electrode active material layer.

[0067] As described above, the first current collector 100A of Embodiment 1 includes a support layer 110, a first conductive layer 120, and a tab portion 140. The support layer 110 is made of a resin composition having electrical insulating properties. The first conductive layer 120 is laminated on the support layer 110. The tab portion 140 is made of a film-like component. The tab portion 140 includes a tab body portion 141 and a heat dissipation portion 142. The tab body portion 141 is connected to the first conductive layer 120. The tab body portion 141 is configured to be able to connect with other conductive components to conduct electricity with other conductive components. The heat dissipation portion 142 is bent multiple times.

[0068] As described above, the membrane-like component constituting the tab portion 140 is bent multiple times in the heat dissipation portion 142, thereby increasing the surface area of ​​the heat dissipation portion 142 within a limited space (e.g., inside the casing 20 of the battery 1). This allows for effective heat dissipation at the connection between the first conductive layer 120 and the tab body portion 141 when energized. Consequently, localized heating of the electrode body 10 can be suppressed.

[0069] In this embodiment, the tab body 141 extends away from the first conductive layer 120. The heat dissipation portion 142 includes a plurality of valley bends 143 and a plurality of mountain bends 144. The plurality of valley bends 143 and the plurality of mountain bends 144 are arranged alternately. The plurality of valley bends 143 protrude toward the first conductive layer 120. The plurality of mountain bends 144 protrude toward the opposite side of the first conductive layer 120. The plurality of valley bends 143 extend along the extending direction DE of the tab body 141. The plurality of mountain bends 144 extend along the extending direction DE.

[0070] As described above, the plurality of valley bends 143 and the plurality of mountain bends 144 extend along the extension direction DE, thereby making the heat dissipation portion 142 more compact in the orthogonal direction DX (the winding direction DR in this embodiment) which is orthogonal to the extension direction DE. Furthermore, the tab portion 140 as a whole becomes compact in the aforementioned orthogonal direction DX, making it easier to connect the tab body portion 141 to the first conductive layer 120.

[0071] In addition, in this embodiment, the tab body 141 is not bent, or is bent a fewer number of times than the heat dissipation part 142.

[0072] According to the above structure, the tab body 141 includes more relatively flat portions, thus making it easy to connect the tab body 141 to other conductive components.

[0073] (Implementation Method 2)

[0074] Next, the first current collector and battery of Embodiment 2 of this disclosure will be described. It should be noted that sometimes the same structure and effects as in Embodiment 1 are omitted.

[0075] Figure 7 This is a unfolded view of the first electrode in Embodiment 2. Figure 8 It is observed along the direction of the arrow on line VIII-VIII. Figure 7 A partial cross-sectional view of the first electrode.

[0076] like Figure 7 and Figure 8 As shown, in Embodiment 2, a plurality of valley bends 143a extend along an orthogonal direction DX that is orthogonal to the extending direction DE of the tab body 141. A plurality of mountain bends 144a extend along the orthogonal direction DX.

[0077] As described above, the plurality of valley bends 143a and the plurality of mountain bends 144a extend along the orthogonal direction DX, thereby allowing the heat dissipation portion 142a to be formed by compressing a film-like component that is relatively long in the extension direction DE. Furthermore, the tab body portion 141 extends from the first conductive layer 120, and therefore the tab body portion 141 is also a relatively long component in the extension direction DE. Thus, the variation in length of the film-like component constituting the tab portion 140 along the entire orthogonal direction DX and the extension direction DE is reduced. Therefore, the film-like component constituting the tab portion 140 can be easily cut from the raw material film, providing a first current collector 100A that is easy to manufacture.

[0078] It should be noted that in this embodiment, the heat dissipation part 142a is not directly connected to the electrode body part 141. The heat dissipation part 142a is not bonded to the first conductive layer 120 by ultrasonic welding.

[0079] In this embodiment, the tab portion 140 further includes a joining portion 146a. The joining portion 146a is connected to the tab body portion 141 in the winding direction DR. The joining portion 146a is connected to the heat dissipation portion 142a at its end in the extending direction DE. The joining portion 146a and the heat dissipation portion 142a are side by side. The joining portion 146a is joined to the first conductive layer 120 by ultrasonic bonding.

[0080] In the above description of the embodiments, the combinable structures can be combined with each other.

[0081] The embodiments disclosed herein should be considered illustrative rather than restrictive in all respects. The scope of this disclosure is defined not by the foregoing description but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

Claims

1. A current collector, wherein, The current collector has: Support layer; Conductive layer; and extreme ear area, The support layer is composed of an electrically insulating resin composition. The conductive layer is stacked on the support layer. The tab portion is composed of a membrane-like component. The electrode portion includes an electrode body and a heat dissipation portion. The main body of the electrode is connected to the conductive layer. The electrode body is configured to engage with other conductive components to conduct electricity with those other conductive components. The heat dissipation section was bent multiple times.

2. The current collector according to claim 1, wherein, The electrode body extends away from the conductive layer. The heat dissipation section includes multiple valley bends and multiple mountain bends. The multiple valley bends and the multiple mountain bends are arranged alternately. The plurality of valley folds protrude toward the conductive layer side. The plurality of bends protrude to the opposite side of the conductive layer side. The plurality of valley folds extend along the extension direction of the electrode body. The plurality of mountain-shaped bends extend along the extension direction.

3. The current collector according to claim 1, wherein, The electrode body extends away from the conductive layer. The heat dissipation section includes multiple valley bends and multiple mountain bends. The multiple valley bends and the multiple mountain bends are arranged alternately. The multiple valley folds protrude toward the conductive layer side. The plurality of bends protrude to the opposite side of the conductive layer side. The plurality of valley folds extend in an orthogonal direction to the extension direction of the electrode body. The plurality of mountain-shaped bends extend along the orthogonal direction.

4. The current collector according to claim 2 or 3, wherein, The main body of the electrode is not bent or is bent a fewer number of times than the heat dissipation part.

5. A battery, wherein, The battery has the following features: Electrode body; and external terminals, The electrode body includes a first electrode, a second electrode, and a diaphragm. The first electrode includes a current collector and an active material layer. The current collector includes a support layer, a conductive layer, and a tab portion. The support layer is composed of an electrically insulating resin composition. The conductive layer is stacked on the support layer. The tab portion is composed of a membrane-like component. The electrode portion includes an electrode body and a heat dissipation portion. The electrode body is connected to the conductive layer. The electrode body is configured to engage with other conductive components to conduct electricity with those other conductive components. The heat dissipation section was bent multiple times. The active material layer is stacked on the conductive layer. The membrane layer is stacked on top of the active material layer. The second electrode is stacked on the active material layer through the membrane. The external terminal is electrically connected to the electrode body.

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