Battery and method for manufacturing battery

Abstract

The invention provides a battery and a manufacturing method of the battery. This battery is provided with: an electrode body formed by laminating a positive electrode current collector, a negative electrode current collector, a positive electrode foil extending from the positive electrode current collector, and a negative electrode foil extending from the negative electrode current collector; a first foil collection part for collecting one of the positive electrode foil and the negative electrode foil as one; a second foil collection part which is formed by dividing the other one of the positive electrode foil and the negative electrode foil into a plurality of pieces and collecting the pieces; a first terminal joined to the first foil collection portion; and a second terminal joined to the second foil collection portion.

Description

Technical Field

[0001] This disclosure relates to batteries.

[0002] This application is based on Japanese Patent Application No. 2024-139219, filed on August 20, 2024, and claims priority to it under 35 U.S.C., section 119, the disclosure of which is incorporated herein by reference. Background Technology

[0003] Japanese Patent Application Publication No. 2015-060823 discloses a battery in which an electrode assembly (electrode body) is housed in a battery can (outer can). In the battery disclosed in Japanese Patent Application Publication No. 2015-060823, the exposed metal foil portion of one of the positive electrode and the negative electrode has multiple current-collecting leads, and the exposed metal foil portion of the other electrode has a continuous structure with a specified width.

[0004] However, in the battery disclosed in Japanese Patent Application Publication No. 2015-060823, multiple current collector leads are individually connected to the terminals, resulting in a complex structure. On the other hand, methods for assembling metal foils and connecting them to terminals are known, but this becomes difficult when there are many metal foils, leaving room for improvement in terms of increasing energy density. Summary of the Invention

[0005] This disclosure takes into account the above facts and provides a battery with improved energy density through a simple structure, as well as a method for manufacturing the battery.

[0006] The battery of the first embodiment includes: an electrode body, which is formed by stacking a positive current collector, a negative current collector, a positive foil extending from the positive current collector, and a negative foil extending from the negative current collector; a first foil collection section, which gathers one of the positive foil and the negative foil into one; a second foil collection section, which divides the other of the positive foil and the negative foil into multiple portions and gathers them together; a first terminal, which is connected to the first foil collection section; and a second terminal, which is connected to the second foil collection section.

[0007] In the battery of the first embodiment, an electrode body is formed by stacking a positive current collector, a negative current collector, a positive foil extending from the positive current collector, and a negative foil extending from the negative current collector. Furthermore, one of the positive and negative foils is combined into a single first foil portion, which is then bonded to a first terminal. This combination of the positive and negative foils into a single unit provides a simpler construction compared to the case where each foil is individually bonded to the first terminal.

[0008] Furthermore, the other of the positive and negative electrode foils is divided into multiple portions and assembled as a second foil section, which is then connected to the second terminal. Thus, by assembling the second foil section into multiple portions, even in cases where the number of foils is too large to be assembled into one, such as when the number of positive and negative electrode foils differs, it is possible to assemble the foils without reducing the number of foils. That is, energy density can be increased.

[0009] In the second type of battery, in the first type, the first terminal is disposed on one end of the electrode body, and the second terminal is disposed on the other end of the electrode body.

[0010] In the second type of battery, by setting the first terminal on one end of the electrode body and the second terminal on the other end of the electrode body, the densification of the first and second foil portions can be suppressed.

[0011] In the third type of battery, in the second type, the distance from the other end of the electrode body to the second terminal is shorter than the distance from one end of the electrode body to the first terminal.

[0012] In third-party batteries, the second foil section, which is divided into multiple parallel sections, can be shorter than the first foil section. Therefore, by designing the distance on the second foil section side to be shorter, the energy density can be improved.

[0013] In the fourth type of battery, in the first type, the number of foils collected in the second foil collection section is greater than that in the first foil collection section.

[0014] In the fourth type of battery, by dividing the second foil section, which has a larger number of foil pieces, into multiple pieces and then combining them, assembly and bonding can be easily performed.

[0015] In the fifth type of battery, in the first type, the first foil portion is bent near a corner of the electrode body to engage with the first terminal.

[0016] In the fifth type of battery, by bending the first collecting foil portion near one corner of the electrode body, gas can be stored near another corner of the electrode body when gas is generated. Therefore, when the internal pressure of the battery increases, gas can leak from the gas-storage portion to the outside of the battery.

[0017] In the sixth embodiment of the battery, the first foil portion is engaged with the first terminal at one location, and the second foil portion is engaged with the second terminal at multiple locations.

[0018] In the sixth type of battery, the first foil portion is joined to the first terminal at one point. Therefore, compared to the second foil portion, which is joined at multiple points, the unjoined area in the first terminal is larger. Consequently, the unjoined area becomes a fragile structure, making it easy for gas to leak from the first terminal side when the internal pressure of the battery increases.

[0019] The battery of the seventh type, in the first type, further comprises: a housing for housing the electrode body; a first external terminal disposed on the housing and electrically connected to the first terminal; and a second external terminal disposed on the housing and electrically connected to the second terminal.

[0020] In the battery of the seventh type, the first foil portion is electrically connected to the first external terminal via the first terminal, and the second foil portion is electrically connected to the second external terminal via the second terminal. This increases the design freedom of the first and second external terminals.

[0021] The battery manufacturing method of the eighth method is a method for manufacturing a battery having an electrode body, wherein the electrode body is constructed by stacking a positive current collector, a negative current collector, a positive foil extending from the positive current collector, and a negative foil extending from the negative current collector. The battery manufacturing method includes the following steps: assembling one of the positive foil and the negative foil into one and connecting it to a first terminal disposed at one end of the electrode body; and dividing the other of the positive foil and the negative foil into multiple portions and assembling them to connect them to a second terminal disposed at the other end of the electrode body.

[0022] As explained above, the battery and its manufacturing method according to this disclosure can improve energy density with a simple structure. Attached Figure Description

[0023] Exemplary embodiments of this disclosure will be described in detail with reference to the following figures, wherein:

[0024] Figure 1 This is a schematic top view showing the main parts of a vehicle using a battery implemented in this way.

[0025] Figure 2 This is a schematic 3D diagram of the battery module.

[0026] Figure 3 This is a cross-sectional view of the battery cell in the embodiment, viewed from the stacking direction.

[0027] Figure 4 It is a schematic cross-sectional view depicting the cross-section of the electrode body in the embodiment.

[0028] Figure 5 It means from Figure 3 The state of the gas produced a cross-sectional view of the gas state.

[0029] Figure 6 It indicates that the gas comes from Figure 5 A cross-sectional view of the state of the leak.

[0030] Figure 7 This is a cross-sectional view of the battery cell of the first modified example as viewed from the stacking direction.

[0031] Figure 8 This is a cross-sectional view of the battery cell of the second modified example viewed from the stacking direction. Detailed Implementation

[0032] (The overall structure of vehicle 100)

[0033] Figure 1 This is a schematic top view showing the main parts of a vehicle 100 using the battery pack 10 of this embodiment. Figure 1 As shown, vehicle 100 is an electric vehicle (BEV) with a battery pack 10 mounted under the floor. Additionally, the arrows UP, FR, and LH in each figure represent the upper side in the vertical direction, the front side in the longitudinal direction, and the left side in the width direction, respectively. When using the directions front-back, left-right, up-down, or forward / backward, unless otherwise specified, they represent the front-back direction, the left-right direction, and the up-down direction, respectively.

[0034] In this embodiment, the vehicle 100 is an example, in which a DC / DC converter 102, an electric compressor 104, and a PTC (Positive Temperature Coefficient) heater 106 are arranged on the front side of the vehicle relative to the battery pack 10. In addition, an electric motor 108, a gearbox 110, an inverter 112, and a charger 114 are arranged on the rear side of the vehicle relative to the battery pack 10.

[0035] The DC current output from the battery pack 10 is regulated by the DC / DC converter 102 and then supplied to the electric compressor 104, PTC heater 106, inverter 112, etc. In addition, by supplying power to the motor 108 via the inverter 112, the rear wheels rotate, thus driving the vehicle 100.

[0036] A charging port 116 is provided on the right side of the rear of the vehicle 100. By connecting the charging port 116 to the charging plug of an external charging device (not shown), power can be stored in the battery pack 10 via the charger 114.

[0037] Furthermore, the configuration and structure of the components constituting the vehicle 100 are not limited to the structure described above. For example, it can also be applied to hybrid vehicles (HV) or plug-in hybrid electric vehicles (PHEVs) equipped with an engine. In this embodiment, the vehicle is a rear-wheel drive vehicle with the electric motor 108 mounted at the rear of the vehicle, but it is not limited to this. It can also be a front-wheel drive vehicle with the electric motor 108 mounted at the front of the vehicle, or a pair of electric motors 108 can be mounted at both the front and rear of the vehicle. Furthermore, it can also be a vehicle with an in-wheel electric motor at each wheel.

[0038] The battery pack 10 is configured to include a plurality of battery modules 11. In this embodiment, as an example, 10 battery modules 11 are provided. Specifically, 5 battery modules 11 are arranged along the front-rear direction on the right side of the vehicle 100, and 5 battery modules 11 are arranged along the front-rear direction on the left side of the vehicle 100. In addition, the battery modules 11 are electrically connected to each other.

[0039] Figure 2 This is a schematic 3D view of battery module 11. (As shown) Figure 2 As shown, the battery module 11 is formed into a generally rectangular parallelepiped shape with the width of the vehicle as its length. Furthermore, the housing 13 of the battery module 11 is made of aluminum alloy. For example, aluminum die-castings are joined to both ends of an extruded aluminum alloy material by laser welding or the like, thereby forming the housing 13 of the battery module 11.

[0040] A pair of voltage terminals 12 and a connector 14 are respectively provided at both ends of the battery module 11 in the vehicle width direction. In addition, busbars (not shown) are welded to both ends of the battery module 11 in the vehicle width direction.

[0041] Here, multiple battery cells serving as batteries are housed inside the battery module 11.

[0042] Figure 3 This is a cross-sectional view of the battery cell 20 of the embodiment, viewed from the stacking direction. (Example) Figure 3 As shown, the battery cell 20 of this embodiment is configured to include an outer casing 22 as a housing and an electrode body 24.

[0043] The outer can 22 constitutes the outer casing of the battery cell 20 and is formed in a generally rectangular parallelepiped shape. As an example, the outer can 22 in this embodiment is configured to include a generally cylindrical peripheral wall portion 22A, a positive electrode side cover portion 22B that closes the opening on one side of the peripheral wall portion 22A, and a negative electrode side cover portion 22C that closes the opening on the other side of the peripheral wall portion 22A.

[0044] The peripheral wall portion 22A is formed of metal into a generally rectangular shape with openings at both ends, and is sized to accommodate the electrode body 24 internally. The positive electrode side cover portion 22B is fixed to the opening on one side of the peripheral wall portion 22A by fitting, welding or other means, thus closing the opening on one side of the peripheral wall portion 22A. In addition, an opening 22D is formed in the center of the positive electrode side cover portion 22B, and a generally frame-shaped positive electrode side insulator 26 is provided in the opening 22D.

[0045] The negative electrode side cover 22C is fixed to the opening on the other side of the peripheral wall 22A by fitting, welding or other means, thus closing the opening on the other side of the peripheral wall 22A. In addition, an opening 22E is formed in the center of the negative electrode side cover 22C, and a generally frame-shaped negative electrode side insulator 28 is provided in the opening 22E.

[0046] A negative electrode tab 32, serving as a first external terminal, is disposed inside the negative electrode insulator 28. A positive electrode tab 30, serving as a second external terminal, is disposed inside the positive electrode insulator 26. The negative electrode tab 32 is electrically connected to the first terminal 33 housed inside the outer packaging can 22, and the positive electrode tab 30 is electrically connected to the second terminal 31 housed inside the outer packaging can 22.

[0047] The first terminal 33 is formed in a generally rectangular plate shape with an outer diameter larger than the negative electrode tab 32, and a first foil collection portion 34, described later, is attached to the first terminal 33. In addition, the second terminal 31 is formed in a generally rectangular plate shape with an outer diameter larger than the positive electrode tab 30, and a second foil collection portion 36, described later, is attached to the second terminal 31.

[0048] Figure 4 This is a schematic cross-sectional view depicting the electrode body 24 in the embodiment. Furthermore, Figure 4 Only a portion of electrode body 24 is shown schematically, and the actual number of layers differs.

[0049] like Figure 4 As shown, the electrode body 24 is constructed by stacking a negative electrode current collector 40, a negative electrode mixed material 42, a solid electrolyte 44, a positive electrode mixed material 46, and a positive electrode current collector 48. The negative electrode current collector 40 is disposed in the center of the stacking direction and is formed of metal foil. Copper foil is preferred as the negative electrode current collector 40.

[0050] Negative electrode composite material 42 is coated on both sides of the negative electrode current collector 40. The negative electrode composite material 42 is a mixture of negative electrode active material, conductive auxiliary material, and binder, etc. Examples of negative electrode active materials include natural graphite, artificial graphite, hard carbon (non-graphitized carbon) or soft carbon (graphitizable carbon), Si, SiOx (0 < x < 2), Si-based alloys, Sn, SnOx (0 < x < 2), Li, Li-based alloys, and Li4Ti5O. 12At least one of the group. Examples of artificial graphite include highly oriented graphite and mesophase carbon microspheres. Artificial graphite is preferred as the negative electrode active material.

[0051] A solid electrolyte 44 is stacked on the side of the negative electrode mixture 42 opposite to the negative electrode current collector 40. Furthermore, a positive electrode mixture 46 is stacked on the side of the solid electrolyte 44 opposite to the negative electrode mixture 42. The positive electrode mixture 46 is a mixture of a positive electrode active material, conductive auxiliary material, and binder, etc., and is coated onto the positive electrode current collector 48. There are no particular limitations on the positive electrode active material; conventionally known materials can be appropriately used. Examples of positive electrode active materials include LiCoO2, LiNiO2, LiMnO2, LiMn2O4, Li(NiCoMn)O2, Li(NiCoAl)O2, and LiFePO4. Furthermore, the positive electrode active material particles can be Hi-Nickel (a positive electrode active material with a high Ni ratio), or they can be Li-Ni-Co-Mn composite oxides or ternary positive electrode active materials.

[0052] The positive current collector 48 is formed of metal foil, preferably aluminum foil. Thus, the electrode body 24 of this embodiment, as an example, has a structure in which a negative current collector 40 is arranged in the center in the stacking direction, and positive current collectors 48 are arranged on both sides of the negative current collector 40. Therefore, the number of positive current collectors 48 is greater than the number of negative current collectors 40.

[0053] Here, a positive foil (not shown) extends from the end of the positive current collector 48, and a negative foil (not shown) extends from the end of the negative current collector 40.

[0054] like Figure 3 As shown, a first foil collection section 34 is formed by a negative electrode foil with a negative electrode current collector 40 at one end of the electrode body 24 along its length. The first foil collection section 34 is bent near one corner of the electrode body 24 (lower right of the paper) and engages with a first terminal 33.

[0055] On the other hand, a second foil collection section 36, which divides the positive electrode foil of the positive current collector 48 into multiple parts and assembles them, is provided at the other end of the electrode body 24 along its length. As an example, in this embodiment, the second foil collection section 36 is divided into two parts. One of the second foil collection sections 36 bends near the upper left corner of the electrode body 24 and engages with the second terminal 31. The other second foil collection section 36 bends near the lower left corner of the electrode body 24 and engages with the second terminal 31. Therefore, the first foil collection section 34 engages with the first terminal 33 at one location, and the second foil collection section 36 engages with the second terminal 31 at multiple locations.

[0056] Furthermore, since the number of positive current collectors 48 is greater than the number of negative current collectors 40, the number of foils collected in the second foil collection section 36 is greater than that in the first foil collection section 34. Specifically, the total number of foils in the divided second foil collection section 36 is greater than the total number of foils in the first foil collection section 34.

[0057] Furthermore, in this embodiment, the distance from the end of the electrode body 24 on the second terminal 31 side to the second terminal 31 is shorter than the distance from the end of the electrode body 24 on the first terminal 33 side to the first terminal 33. That is, the space between the electrode body 24 and the second terminal 31 is narrower than the space between the electrode body 24 and the first terminal 33.

[0058] In this embodiment, the battery cell 20 is formed, for example, by joining a negative electrode foil assembly extending from the negative electrode current collector 40 to the first terminal 33, and then joining a positive electrode foil assembly extending from the electrode body 24 in a divided state to the second terminal 31.

[0059] (effect)

[0060] Next, the function of the battery cell 20 and the energy storage device mounting structure in this embodiment will be explained.

[0061] In the battery cell 20 of this embodiment, such as Figure 4 As shown, the electrode body 24 is constructed by stacking a positive current collector 48, a negative current collector 40, a positive electrode foil extending from the positive current collector 48, and a negative electrode foil extending from the negative current collector 40. Furthermore, as... Figure 3 As shown, the negative electrode foil is assembled into one as a first foil collection section 34, and the first foil collection section 34 is connected to the first terminal 33. In this way, by assembling one side of the negative electrode foil into one, a simpler structure is achieved compared to the case where multiple negative electrode foils are individually connected to the first terminal 33.

[0062] Furthermore, the positive electrode foil is divided into multiple parallel sets as the second foil collection section 36, and the second foil collection section 36 is connected to the second terminal 31. In this way, by dividing the second foil collection section 36 into multiple parallel sets, even in cases where the number of foils is large and cannot be combined into one, such as when the number of positive and negative electrode foils is different, it is possible to combine them without reducing the number of foils. That is, the energy density can be improved.

[0063] In addition, in this embodiment, by providing the first terminal 33 on one end of the electrode body 24 and the second terminal 31 on the other end of the electrode body 24, the densification of the first foil portion 34 and the second foil portion 36 can be suppressed.

[0064] Furthermore, in this embodiment, the second foil section 36, which is divided into multiple sets and joined together, can be shorter than the first foil section 34. Therefore, by designing the distance on the side of the second foil section 36 to be shorter, the energy density can be improved.

[0065] Furthermore, in this embodiment, by dividing the second foil-gathering section 36, which has a large number of foil sheets, into multiple sections and then assembling them, assembly and bonding can be easily performed. That is, when the second foil-gathering section 36, which has a large number of foil sheets, is assembled into one, the foil-gathering section becomes thicker, making assembly and bonding to the terminals difficult. In contrast, by dividing the second foil-gathering section 36 into multiple sections as in this embodiment, assembly and bonding become easier.

[0066] Furthermore, in this embodiment, the first foil collection section 34 is electrically connected to the negative electrode tab 32 via the first terminal 33, and the second foil collection section 36 is electrically connected to the positive electrode tab 30 via the second terminal 31. This increases the design flexibility of the negative electrode tab 32 and the positive electrode tab 30.

[0067] Furthermore, in this embodiment, by bending the first foil portion 34 near one corner of the electrode body 24, gas can be stored near another corner of the electrode body 24 when gas is generated. Therefore, when the internal pressure of the battery increases, gas can leak from the stored portion to the outside of the battery. Figure 5 and Figure 6 Explain this effect.

[0068] Figure 5 It means from Figure 3 The state of the gas produced a cross-sectional view of the gas state. Figure 6 It indicates that the gas comes from Figure 5 A cross-sectional view of the state of the leak. For example... Figure 5 As shown, gas G is generated from the electrode body 24 through repeated charging and discharging of the battery cell 20. In addition, when the battery cell 20 malfunctions, a large amount of gas G is sometimes generated, and the internal pressure of the outer casing 22 becomes high.

[0069] Here, on the negative electrode side of the electrode body 24, a gap is provided near the corner on the side opposite to the side that bends towards the first foil collection section 34, making it easy for gas G to accumulate. Furthermore, since the first foil collection section 34 is joined to the first terminal 33 at only one location, the unjoined area in the first terminal 33 is larger compared to the second foil collection section 36, which is joined at multiple locations. Therefore, the unjoined area becomes a fragile structure, such as... Figure 6 As shown, the corner of the outer canister 22 is ruptured, allowing gas G to leak to the outside of the outer canister 22.

[0070] It should be noted that, in the above embodiments, such as Figure 3As shown, the negative electrode tab 32 is electrically connected to the first terminal 33 housed inside the outer can 22, and the positive electrode tab 30 is electrically connected to the second terminal 31 housed inside the outer can 22, but this is not a limitation. For example, alternative methods may be used. Figure 7 The structure of the first modified example shown is illustrated. Furthermore, in the above embodiment, a first terminal 33 is provided on one side of the electrode body 24 along its length, and a second terminal 31 is provided on the other side, but the embodiment is not limited to this. For example, alternative methods may also be used. Figure 8 The structure of the second modified example shown.

[0071] (First variation)

[0072] Figure 7 This is a cross-sectional view of the battery cell 50 of the first modified example, viewed from the stacking direction. Figure 7 As shown, the battery cell 50 of this modified example includes a housing 52. The housing 52 is a laminated film constituting the outer shell of the battery cell 50, and an electrode body 24 is housed in the housing 52.

[0073] An annular insulating member 54 is fixed to one end of the housing 52, and a first terminal 56 is disposed inside the insulating member 54. In addition, an annular insulating member 58 is fixed to the other end of the housing 52, and a second terminal 60 is disposed inside the insulating member 58.

[0074] The first foil portion 34 of the electrode body 24 is engaged with the first terminal 56, and the second foil portion 36 is engaged with the second terminal 60.

[0075] As in this variation, this disclosure can also be applied to laminated battery cells.

[0076] (Second variation)

[0077] Figure 8 This is a cross-sectional view of the battery cell 70 of the second modified example, viewed from the stacking direction. Figure 8 As shown, the orientation of the terminals of the battery cell 70 in this modified example differs from that in the previous embodiment. Specifically, the battery cell 70 in this modified example includes an outer casing 72. The outer casing 72 constitutes the outer shell of the battery cell 70, and the electrode body 24 is housed inside the outer casing 72.

[0078] The outer can 72 is formed in a generally rectangular box shape with an open top, and the opening at the top of the outer can 72 is closed by a cover member 74. The cover member 74 is formed in a generally flat shape and has two through holes.

[0079] An insulating component 76 and an insulating component 80 are respectively provided in the through hole of the cover component 74. A negative electrode tab 78, serving as a first external terminal, is fixed inside the insulating component 76. In addition, a positive electrode tab 82, serving as a second external terminal, is fixed inside the insulating component 80.

[0080] A first terminal 84 is fixed to the negative electrode tab 78, and a first foil collection portion 34 is connected to the first terminal 84. In addition, a second terminal 86 is fixed to the positive electrode tab 82, and a second foil collection portion 36, which is divided into two parts, is connected to the second terminal 86.

[0081] As in this modified example, this disclosure can be applied to battery cells that have an upper terminal structure with a positive electrode tab 82 and a negative electrode tab 78 provided on the upper part.

[0082] The battery cells 20, 50, and 70 involved in the embodiments and variations have been described above, but are not limited thereto. It is natural that they can be implemented in various ways without departing from the spirit of this disclosure. For example, in the above embodiments, such as... Figure 3 As shown, a first foil assembly section 34 is configured to assemble the negative electrode foil into one unit, and a second foil assembly section 36 is configured to divide the positive electrode foil into multiple units and assemble them together, but this is not a limitation. It is also possible to configure the negative electrode foil into multiple units and the positive electrode foil into one unit.

[0083] Furthermore, in the above embodiment, the second foil section 36 is divided into two sets, but it is not limited to this. For example, it may be divided into three or more sets. However, it is preferable to divide and set the set with the foil section having more foil pieces.

[0084] Regarding the above-described embodiments, the following notes are disclosed.

[0085] (Note 1)

[0086] A battery includes: an electrode body formed by stacking a positive current collector, a negative current collector, a positive foil extending from the positive current collector, and a negative foil extending from the negative current collector; a first foil collection portion that gathers one of the positive foil and the negative foil into one; a second foil collection portion that divides the other of the positive foil and the negative foil into multiple portions and gathers them together; a first terminal that is connected to the first foil collection portion; and a second terminal that is connected to the second foil collection portion.

[0087] (Note 2)

[0088] According to Appendix 1, the battery has the first terminal disposed on one end of the electrode body and the second terminal disposed on the other end of the electrode body.

[0089] (Note 3)

[0090] According to the battery described in Appendix 2, the distance from the other end of the electrode body to the second terminal is shorter than the distance from one end of the electrode body to the first terminal.

[0091] (Note 4)

[0092] According to any one of Appendices 1 to 3, in the battery, the number of foils collected in the second foil collection section is greater than the number of foils collected in the first foil collection section.

[0093] (Note 5)

[0094] According to any one of Appendices 1 to 4, the first foil portion is bent near a corner of the electrode body to engage with the first terminal.

[0095] (Note 6)

[0096] According to the battery described in Appendix 5, the first foil portion is engaged with the first terminal at one location, and the second foil portion is engaged with the second terminal at multiple locations.

[0097] (Note 7)

[0098] The battery according to any one of Appendices 1 to 6 further comprises: a housing housing the electrode body; a first external terminal disposed on the housing and electrically connected to the first terminal; and a second external terminal disposed on the housing and electrically connected to the second terminal.

[0099] (Note 8)

[0100] A method for manufacturing a battery, wherein the battery includes an electrode body, the electrode body being constructed by stacking a positive current collector, a negative current collector, a positive foil extending from the positive current collector, and a negative foil extending from the negative current collector, the method for manufacturing the battery comprising the steps of: assembling one of the positive foil and the negative foil into one and engaging it with a first terminal disposed at one end of the electrode body; and dividing the other of the positive foil and the negative foil into multiple portions and assembling them to engage them with a second terminal disposed at the other end of the electrode body.

Claims

1. A battery having: An electrode body is constructed by stacking a positive current collector, a negative current collector, a positive foil extending from the positive current collector, and a negative foil extending from the negative current collector. The first foil assembly is formed by combining one of the positive electrode foil and the negative electrode foil into one unit; The second foil section is formed by dividing one of the positive electrode foil and the negative electrode foil into multiple parts and then assembling them; The first terminal is engaged with the first foil portion; and The second terminal is engaged with the second foil section.

2. The battery according to claim 1, wherein, The first terminal is disposed at one end of the electrode body. The second terminal is located at the other end of the electrode body.

3. The battery according to claim 2, wherein, The distance from the other end of the electrode to the second terminal is shorter than the distance from one end of the electrode to the first terminal.

4. The battery according to claim 1, wherein, The number of foils collected in the second foil collection section is greater than the number of foils collected in the first foil collection section.

5. The battery according to claim 1, wherein, The first foil portion bends near a corner of the electrode body to engage with the first terminal.

6. The battery according to claim 5, wherein, The first foil portion is engaged with the first terminal at one point. The second foil portion engages with the second terminal at multiple locations.

7. The battery according to claim 1, wherein, The battery also has: Housing, which houses the electrode body; A first external terminal is disposed on the housing and electrically connected to the first terminal; and A second external terminal is disposed on the housing and electrically connected to the second terminal.

8. A method for manufacturing a battery, wherein, The battery includes an electrode body, which is constructed by stacking a positive current collector, a negative current collector, a positive electrode foil extending from the positive current collector, and a negative electrode foil extending from the negative current collector. The battery manufacturing method includes the following steps: One of the positive electrode foil and the negative electrode foil is assembled into one and connected to a first terminal disposed at one end of the electrode body; and The other of the positive electrode foil and the negative electrode foil is divided into multiple parts and assembled to be connected to a second terminal disposed on the other end side of the electrode body.

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