Battery

Abstract

To provide a battery in which a damage of a laminate film occurs less easily even when a load is applied to the battery in a direction of pushing a current collection terminal into an electrode body side.SOLUTION: A battery includes an electrode body, a plurality of current collector tabs extending from a side surface part of the electrode body, a current collector terminal connected to the current collector tabs, and a laminate film that accommodates the electrode body and the current collector tabs. The current collector tab includes a root part, which is an end part on the electrode body side, a connection part to be connected to the current collector terminal, and an intermediate part connecting the root part and the connection part. In each of the current collector tabs, the connection part includes a multilayer connection part stacked in a thickness direction. The current collector terminal includes an inner surface facing the side surface part of the electrode body and a side surface disposed along an outer edge of the inner surface. At a side surface of the current collector terminal, the laminate film is disposed. On the inner surface, a main surface of the multilayer connection part is bonded, and between the inner surface and the side surface part, a spacer member is disposed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This disclosure relates to batteries. [Background technology]

[0002] Batteries such as lithium-ion secondary batteries typically comprise an electrode assembly having a positive electrode current collector, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, and a negative electrode current collector. The electrode assembly is sealed by an outer casing. Electricity generated in the electrode assembly is led from the inside of the outer casing to the outside by current collection terminals. For example, Patent Document 1 discloses a stacked or stacked / folded electrode assembly with a positive electrode / separator / negative electrode structure. Figure 2 of Patent Document 1 also discloses the connection of multiple tabs (e.g., positive electrode tabs 40) in a densely packed configuration to a lead (e.g., positive electrode lead 60). Furthermore, Patent Document 1 discloses the use of a laminate sheet (laminate film) as the outer casing. Similarly, Patent Documents 2 and 3 also disclose the use of a laminate film as the outer casing. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Patent No. 5550805 [Patent Document 2] Japanese Patent Publication No. 2011-108623 [Patent Document 3] Japanese Patent Publication No. 2020-115423 [Overview of the project] [Problems that the invention aims to solve]

[0004] Batteries using laminated film are vulnerable to loads that push the current collection terminals towards the electrode body, and such loads can easily cause damage to the laminated film.

[0005] This disclosure has been made in view of the above circumstances, and its main purpose is to provide a battery in which the laminate film is less likely to be damaged even when a load is applied to the battery in a direction that pushes the current collection terminal toward the electrode body. [Means for solving the problem]

[0006] [1] A battery comprising an electrode body, a plurality of current-collecting tabs extending from the side portion of the electrode body, a current-collecting terminal connected to the plurality of current-collecting tabs, and a laminate film housing the electrode body and the plurality of current-collecting tabs, wherein each current-collecting tab has a root portion which is the end on the electrode body side, a connecting portion for connecting to the current-collecting terminal, and an intermediate portion connecting the root portion and the connecting portion, each of the plurality of current-collecting tabs has a laminated connecting portion which is stacked in the thickness direction at each of the connecting portions, the current-collecting terminal has an inner surface facing the side portion of the electrode body and a side surface arranged along the outer edge of the inner surface, the laminate film is placed on the side surface of the current-collecting terminal, the main surface of the laminated connecting portion is joined to the inner surface, and a spacer member is placed between the inner surface and the side portion.

[0007] [2] The battery according to [1], wherein in a cross-sectional view of the electrode body in the stacking direction, the intermediate portion has a curved structure in which parts of the intermediate portion face each other.

[0008] [3] The above-mentioned spacer member is a resin member, as described in [1] or [2].

[0009] [4] The battery according to any one of [1] to [3], wherein the spacer member is in contact with the inner surface and also in contact with the side surface.

[0010] [5] The battery according to any one of [1] to [4], wherein the battery comprises a first spacer member and a second spacer member as the spacer members, and the plurality of current collecting tabs are arranged between the first spacer member and the second spacer member in a plan view in the stacking direction of the electrode assembly. Effects of the Invention

[0011] In the present disclosure, even when a load in a direction that pushes the current collecting terminal toward the electrode assembly is applied to the battery, an effect of providing a battery in which the laminate film is less likely to be damaged can be obtained. Brief Description of the Drawings

[0012] [Figure 1] It is a schematic perspective view illustrating the battery in the present disclosure. [Figure 2] They are a schematic plan view and a schematic side view illustrating the battery in the present disclosure. [Figure 3] They are an A-A cross-sectional view and a B-B cross-sectional view in FIG. 2(b). [Figure 4] They are a schematic plan view and a schematic cross-sectional view illustrating a conventional battery. [Figure 5] They are a schematic plan view and a schematic cross-sectional view illustrating the battery in the present disclosure. [Figure 6] It is a schematic perspective view illustrating the current collecting terminal in the present disclosure. [Figure 7] It is a schematic plan view illustrating the spacer member in the present disclosure. [Figure 8] It is a schematic cross-sectional view illustrating the spacer member in the present disclosure. [Figure 9] It is a schematic cross-sectional view illustrating the electrode assembly in the present disclosure. [Figure 10] It is a schematic perspective view illustrating the method for manufacturing the battery in the present disclosure. Mode for Carrying Out the Invention

[0013] The battery described in this disclosure will be explained in detail below with reference to the drawings. The following figures are schematic representations, and the size and shape of each part have been exaggerated as appropriate for ease of understanding. In addition, hatching of parts may be omitted as appropriate.

[0014] Figure 1 is a schematic perspective view illustrating a battery in this disclosure. Figures 2(a) and 2(b) are schematic plan views illustrating a battery in this disclosure, and Figure 2(c) is a schematic side view illustrating a battery in this disclosure. As shown in Figures 1 and 2, the battery 100 comprises an electrode body 10 and a side portion S of the electrode body 10. 10 It comprises a plurality of current collection tabs 20 extending from the electrode body, a current collection terminal 30 (first current collection terminal 30A and second current collection terminal 30B) connected to the plurality of current collection tabs 20, and a laminate film 40 that houses the electrode body 10 and the plurality of current collection tabs 20.

[0015] Figure 3(a) is a cross-sectional view of AA in Figure 2(b), and Figure 3(b) is a cross-sectional view of BB in Figure 2(b). As shown in Figure 3(a), the current collector tab 20 has a base portion X which is the end on the electrode body 10 side, a connection portion Y for connecting to the current collector terminal 30, and an intermediate portion Z connecting the base portion X and the connection portion Y. In addition, each of the multiple current collector tabs 20 has a stacked connection portion W in which the connection portion Y is stacked in the thickness direction (vertical direction in Figure 3). The current collector terminal 30 is on the side portion S of the electrode body 10. 10 It has an inner surface S1 facing the front, an outer surface S2 facing the inner surface S1, and four side surfaces (S3, S4, S5, S6) arranged along the outer edge of the inner surface S1. Note that side surfaces S4 and S6 are not shown in Figure 3(a). As shown in Figure 2(c), laminate film 40 is arranged on the four side surfaces S3 to S6. As shown in Figure 3(a), the main surface of the laminated connection part W is joined to the inner surface S1 of the current collection terminal 30. Also, as shown in Figure 3(b), the inner surface S1 of the current collection terminal 30 and the side surface S of the electrode body 10 10 A spacer member 50 is positioned between them.

[0016] According to this disclosure, by using a current collector terminal having a predetermined inner surface and a spacer member, a battery is made in which the laminate film is less likely to be damaged even when a load is applied to the battery in a direction that pushes the current collector terminal toward the electrode body. Here, Figure 4(a) is a schematic plan view illustrating a conventional battery, and Figure 4(b) is a cross-sectional view AA of Figure 4(a). Also, Figure 5(a) is a schematic plan view illustrating the battery in this disclosure, and Figure 5(b) is a cross-sectional view AA of Figure 5(a). As shown in Figures 4(a) and (b), in a conventional battery, when a load is applied in a direction that pushes the current collector terminal 30 toward the electrode body 10 (black arrow), the laminate film 40 is prone to damage. The reason for this is that the rigidity of the current collector terminal 30 is high in the direction of the load, while the rigidity of the current collector tab 20 and the laminate film 40 is low. In contrast, as shown in Figures 5(a) and (b), the present disclosure uses a current collector terminal 30 having an inner surface S1 that can make surface contact with the main surface of the laminated connection portion W. Furthermore, the inner surface S1 of the current collector terminal 30 and the side portion S of the electrode body 10 10 A spacer member 50 is positioned between the current collector terminal 30 and the electrode body 10. Therefore, even if a load is applied in the direction that pushes the current collector terminal 30 toward the electrode body 10 (black arrow), the presence of the spacer member 50 suppresses deformation due to the load, and furthermore, the large surface area of ​​the inner surface S1 flexes, distributing the stress generated by the load. In particular, as will be described later, if the multiple current collector tabs 20 have a curved structure, when the current collector terminal 30 flexes, the multiple current collector tabs 20 also flex at the same time, further distributing the stress generated by the load. Therefore, even when a load is applied to the battery in the direction that pushes the current collector terminal toward the electrode body, the laminate film is less likely to be damaged.

[0017] 1. Battery configuration The battery in this disclosure comprises an electrode body, a plurality of current-collecting tabs extending from the side surface of the electrode body, a current-collecting terminal connected to the plurality of current-collecting tabs, and a laminate film housing the electrode body and the plurality of current-collecting tabs. Furthermore, the battery in this disclosure has a spacer member between the inner surface of the current-collecting terminal and the side surface of the electrode body.

[0018] (1) Electrode body The electrode body in this disclosure typically comprises a power generation unit having a positive electrode current collector, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, and a negative electrode current collector in this order in the thickness direction. The shape of the electrode body is not particularly limited, but preferably it has a top surface, a bottom surface facing the top surface, and four side surfaces connecting the top surface and the bottom surface. The shape of the top surface is not particularly limited, but examples include quadrilaterals such as squares, rectangles, rhombuses, trapezoids, and parallelograms. The shape of the top surface may also be a polygon other than a quadrilateral, or a curved shape such as a circle. The shape of the bottom surface is the same as the shape of the top surface. The shape of the side surfaces is not particularly limited, but examples include quadrilaterals such as squares, rectangles, rhombuses, trapezoids, and parallelograms.

[0019] (2) Multiple current collection tabs The multiple current-collecting tabs in this disclosure are arranged to extend from the side portion of the electrode body. The "side portion of the electrode body" refers to the portion that constitutes the electrode body and whose normal direction intersects the stacking direction of the electrode body. For example, in Figure 3(a), the side portion S of the electrode body 10. 10 The normal direction of the electrode (vertical direction in the drawing) is perpendicular to the stacking direction of the electrode body 10 (horizontal direction in the drawing). Furthermore, "stacking direction of the electrode body" refers to the thickness direction of each layer that makes up the electrode body.

[0020] As shown in Figure 3(a), the current collector tab 20 has a base portion X which is the end on the electrode body 10 side, a connection portion Y for connecting to the current collector terminal 30, and an intermediate portion Z connecting the base portion X and the connection portion Y. The base portion X is the end (boundary portion) of the current collector tab 20 on the electrode body 10 side. The connection portion Y is the part for connecting to the current collector terminal 30 and is the part that constitutes the laminated connection portion W described later. The intermediate portion Z is the part that connects the base portion X and the connection portion Y. In this disclosure, each of the multiple current collector tabs has a laminated connection portion in which the connection portion is stacked in the thickness direction. In Figure 3(a), each connection portion Y of the multiple current collector tabs 20 is stacked in the thickness direction of the current collector tab 20, thereby forming a laminated connection portion W. In the laminated connection portion W, each connection portion Y is joined to each other (fixed to each other).

[0021] As shown in Figure 3(a), in a cross-sectional view of the electrode body 10 in the stacking direction, it is preferable that the intermediate portion Z has a curved structure (area shown by dashed lines) in which parts of the intermediate portion Z face each other. In Figure 3(a), the intermediate portion Z of the rightmost current collection tab 20 among the multiple current collection tabs 20 does not have the curved structure because parts of the intermediate portion Z do not face each other, but the intermediate portions Z of the other multiple current collection tabs 20 all have the curved structure. Thus, it is preferable that the intermediate portion Z of at least one of the multiple current collection tabs 20 has the curved structure. In the curved structure, the parts of the opposing intermediate portions Z may be arranged to be in direct contact with each other, or they may be arranged with a space between them. Also, as shown in Figure 3, it is preferable that the intermediate portions Z of the multiple current collection tabs 20 are curved in a U-shape.

[0022] (3) Current collector terminal The current collector terminal in this disclosure has an inner surface facing the side surface of the electrode body and a side surface arranged along the outer edge of the inner surface. The shape of the inner surface is not particularly limited, but examples include quadrilaterals such as squares, rectangles, rhombuses, trapezoids, and parallelograms. The number of side surfaces is, for example, multiple. The number of side surfaces depends, for example, on the shape of the outer edge of the inner surface. For example, if the shape of the outer edge of the inner surface is quadrilateral, the current collector terminal may have four side surfaces. The current collector terminal may also have an outer surface facing the inner surface. The inner surface usually corresponds to a surface within the area sealed by the laminate film. The outer surface usually corresponds to a surface outside the area sealed by the laminate film. The inner surface, side surfaces, and outer surface may each be flat or curved.

[0023] As shown in Fig. 6, the current collector terminal 30 may include an inner surface S1, an outer surface S2 opposite to the inner surface S1, and four side surfaces (S3, S4, S5, S6) arranged along the outer edge of the inner surface S1. As shown in Fig. 2(b), let D1 be the opposing direction of the electrode assembly 10 and the current collector terminal 30, and D2 be the direction orthogonal to the direction D1. Further, as shown in Fig. 2(c), let D3 be the direction orthogonal to both the direction D1 and the direction D2. The direction D3 is normally the stacking direction D of the electrode assembly 10 L and coincides therewith. As shown in Fig. 6, let L1 be the length of the current collector terminal 30 in the direction D1, L2 be the length of the current collector terminal 30 in the direction D2, and L3 be the length of the current collector terminal 30 in the direction D3. L2 may be greater than L1. The ratio of L2 to L1 (L2 / L1) is, for example, 2 or more, may be 5 or more, and may also be 10 or more. L2 may be greater than L3. The ratio of L2 to L3 (L2 / L3) is, for example, 5 or more, may be 10 or more, and may also be 50 or more. L1 may be greater than L3. The ratio of L1 to L3 (L1 / L3) is, for example, 2 or more, may be 5 or more, and may also be 10 or more.

[0024] Although not particularly illustrated, let L be the length of the electrode assembly in the direction D1 X , let L be the length of the electrode assembly in the direction D2 Y , and let L be the length of the electrode assembly in the direction D3 Z . Let L X be the ratio of L1 to L (L1 / L X ), which is not particularly limited. The ratio of L2 to L (L2 / L Y ) is, for example, 0.8 or more, may be 0.9 or more, and may also be 0.95 or more. L2 / L Y is, for example, 1.0 or less. The ratio of L3 to L (L3 / L Y ) is, for example, 0.8 or more, may be 0.9 or more, and may also be 0.95 or more. L3 / L Z is, for example, 1.0 or less. Z ) is, for example, 0.8 or more, may be 0.9 or more, and may also be 0.95 or more. L3 / L Z is, for example, 1.0 or less.

[0025] When the battery is viewed from the side, from the current collection terminal side, the inner surface of the current collection terminal and the side surface of the electrode body are arranged to overlap. The area where the inner surface of the current collection terminal and the side surface of the electrode body overlap is called the overlapping area. Area S of the side surface of the electrode body. A The area S of the overlapping region B The proportion (S B / S A ) is, for example, 80% or more, may be 90% or more, or may be 95% or more. On the other hand, S B / S A It is less than 100%.

[0026] As shown in Figure 3(a), the main surface of the laminated connection portion W is joined to the inner surface S1 of the current collection terminal 30. The "main surface of the laminated connection portion W" refers to the surface that constitutes the laminated connection portion W and whose normal direction coincides with the thickness direction of the connection portion Y. The main surface of the laminated connection portion W may be joined to the inner surface S1 by direct contact, or it may be joined via another member (for example, a conductive layer). The inner surface S1 of the current collection terminal 30 and the laminated connection portion W are usually joined to each other (fixed to each other).

[0027] (4) Spacer member The spacer member in this disclosure is positioned between the inner surface of the current collector terminal and the side surface of the electrode body. The battery in this disclosure may have one spacer member per current collector terminal, or it may have multiple spacer members. Furthermore, it is preferable that the spacer member is in surface contact with the inner surface of the current collector terminal. Similarly, it is preferable that the spacer member is in surface contact with the side surface of the electrode body.

[0028] Figure 7 is a schematic plan view illustrating a spacer member in this disclosure. As shown in Figure 7(a), in a plan view of the electrode body 10 in the stacking direction, a plurality of current-collecting tabs 20 are arranged between the first spacer member 50A and the second spacer member 50B. In this case, stress is easily distributed when a load is applied in a direction that pushes the current-collecting terminal toward the electrode body. As shown in Figure 7(a), a space may be provided between the spacer member 50 and the plurality of current-collecting tabs 20. In this case, even if the plurality of current-collecting tabs 20 are deformed by a load, it is possible to prevent the plurality of current-collecting tabs 20 from coming into contact with the spacer member 50, thereby preventing damage to the plurality of current-collecting tabs 20. Also, as shown in Figure 7(a), the electrode body 10 and the spacer member 50 may be flush in the direction D2 perpendicular to the opposing direction of the electrode body 10 and the current-collecting terminal 30. In this case, it is possible to suppress the occurrence of wrinkles in the laminate film when covering the electrode body with the laminate film.

[0029] As shown in Figure 7(b), the spacer member 50 and the multiple current-collecting tabs 20 may be in direct contact. In this case, deformation of the tabs due to load can be suppressed by firmly fixing the multiple current-collecting tabs 20. Furthermore, the spacer member 50 may be positioned in a location that overlaps with the multiple current-collecting tabs 20 (for example, a position inside the U-shape of the curved structure shown in Figure 3(a)). Also, as shown in Figure 7(b), the electrode body 10 may protrude from the spacer member 50 in a direction D2 perpendicular to the opposing direction of the electrode body 10 and the current-collecting terminal 30. Also, as shown in Figure 7(c), the spacer member 50 and the multiple current-collecting tabs 20 may be in direct contact, and furthermore, the electrode body 10 and the spacer member 50 may be flush in direction D2. Also, as shown in Figure 7(d), the battery may have one spacer member 50 for each current-collecting terminal 30.

[0030] Figure 8 is a schematic cross-sectional view illustrating a spacer member in this disclosure. As shown in Figure 8(a), in a cross-sectional view of the electrode body 10 in the stacking direction, the spacer member 50 is located on the side portion S of the electrode body 10. 10It may be in contact with the inner surface S1 of the current collection terminal 30. In Figure 8(a), a space is provided between the inner surface S1 of the current collection terminal 30 and the spacer member 50. Also, as shown in Figure 8(b), in a cross-sectional view of the electrode body 10 in the stacking direction, the spacer member 50 may be in contact with the inner surface S1 of the current collection terminal 30. In Figure 8(b), the side surface S of the electrode body 10 10 A space is provided between the spacer member 50 and the current collector terminal 30. Furthermore, as shown in Figure 3(b) above, the spacer member 50 is in contact with the inner surface S1 of the current collector terminal 30 and the side surface S of the electrode body 10. 10 They may also be in contact with each other.

[0031] As shown in Figure 8(c), the stacking direction D of the electrode body 10 L In this configuration, the spacer member 50 may be in contact with only one of the opposing laminate films 40. Also, as shown in Figure 8(d), the lamination direction D of the electrode body 10 L In this configuration, the spacer member 50 may be in contact with both of the opposing laminate films 40. Also, as shown in Figure 3(b) above, the spacer member 50 may be in contact with both of the opposing laminate films 40.

[0032] (5) Laminating film The laminate film in this disclosure houses an electrode body and a plurality of current-collecting tabs. In Figure 2(b), the laminate film 40 covers the electrode body 10, the plurality of current-collecting tabs 20, and the spacer member 50. As shown in Figures 2(b) and (c), the laminate film 40 covers a portion of each side surface S3 to S6 of the current-collecting terminal 30. As shown in Figure 2(c), the laminate film 40 is arranged on each of the side surfaces S3 to S6. Each side surface and the laminate film may be in direct contact, or they may be arranged via other members (for example, a resin layer to improve adhesion). On the other hand, as shown in Figure 1, a seal portion 41 formed by fusing the laminate films 40 together is arranged along the opposing direction D1 of the electrode body 10 and the current-collecting terminal 30.

[0033] 2. Battery components The battery in this disclosure comprises at least an electrode body, a current collector tab, a current collector terminal, a spacer member, and a laminate film.

[0034] The electrode body in this disclosure typically comprises a power generation unit having a positive electrode current collector, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, and a negative electrode current collector in this order in the thickness direction. The electrode body typically has multiple power generation units stacked in the thickness direction. For example, the electrode body 10 shown in Figure 9 has multiple power generation units U stacked in the thickness direction (direction D3). Each power generation unit U has a positive electrode current collector 4, a positive electrode active material layer 1, an electrolyte layer 3, a negative electrode active material layer 2, and a negative electrode current collector 5 in this order in the thickness direction (direction D3). Also, adjacent power generation units U share one negative electrode current collector 5.

[0035] The positive electrode active material layer contains at least a positive electrode active material. The positive electrode active material layer may further contain at least one of a conductive material, an electrolyte, and a binder. Examples of positive electrode active materials include LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 Examples of oxide active materials include O2. Examples of conductive materials include carbon materials. The electrolyte may be a solid electrolyte or a liquid electrolyte (electrolyte solution). The solid electrolyte may be an organic solid electrolyte such as a gel electrolyte, or an inorganic solid electrolyte such as an oxide solid electrolyte or a sulfide solid electrolyte. Examples of binders include rubber-based binders and fluoride-based binders.

[0036] The negative electrode active material layer contains at least a negative electrode active material. The negative electrode active material layer may further contain at least one of a conductive material, an electrolyte, and a binder. Examples of negative electrode active materials include metallic active materials such as Li and Si, carbon active materials such as graphite, and Li4Ti5O 12Examples of oxide active materials include the following. The conductive material, electrolyte, and binder are the same as described above. The electrolyte layer is placed between the positive electrode active material layer and the negative electrode active material layer and contains at least an electrolyte. The electrolyte may be a solid electrolyte or a liquid electrolyte. The electrolyte is the same as described above. The electrolyte layer may have a separator.

[0037] The positive electrode current collector collects current from the positive electrode active material layer. Examples of materials for the positive electrode current collector include metals such as aluminum, stainless steel (SUS), and nickel. The positive electrode current collector can take the form of a foil. The negative electrode current collector collects current from the negative electrode active material layer. Examples of materials for the negative electrode current collector include metals such as copper, stainless steel (SUS), and nickel. The negative electrode current collector can take the form of a foil.

[0038] The battery in this disclosure has a positive electrode tab and a negative electrode tab as current collecting tabs. As shown in Figure 9, the positive electrode tab 4t is on the side portion S of the electrode body 10. 10 The positive electrode tab 4t extends in a direction intersecting the stacking direction (direction D3) of the electrode body 10. Also, as shown in Figure 9, the positive electrode tab 4t may be formed continuously from the positive electrode active material layer 1. When observed from the stacking direction (direction D3) of the electrode body 10, the positive electrode tab 4t is positioned so as not to overlap with the positive electrode active material layer 1. Also, in Figure 9, the negative electrode tab 5t extends from the side of the electrode body 10 in a direction intersecting the stacking direction (direction D3) of the electrode body 10. Details of the negative electrode tab are the same as those of the positive electrode tab, so they are omitted here. As shown in Figure 9, the positive electrode tab 4t may extend from one side of the electrode body 10, and the negative electrode tab 5t may extend from the other side of the electrode body 10 (double-tab structure). On the other hand, although not specifically shown, the positive electrode tab and the negative electrode tab may extend from the same side of the electrode body (single-tab structure).

[0039] The current collector terminal in this disclosure is electrically connected to the current collector tab in the electrode body. The shape of the current collector terminal can be, for example, a plate shape. The material of the current collector terminal can be, for example, a metal such as Al or SUS.

[0040] The spacer member in this disclosure is disposed between the inner surface of the current collector terminal and the side surface of the electrode body. Examples of spacer members include resin members, rubber members, metal members, glass members, and ceramic members. Examples of resins used for resin members include polyethylene, polyolefins such as polypropylene, and polyimide. The spacer member may be insulating or conductive. In the latter case, it is preferable that an insulating member is disposed between the spacer member and the side surface of the electrode body.

[0041] The laminate film in this disclosure has at least a structure in which a heat-sealable layer and a metal layer are laminated. The laminate film may also have the heat-sealable layer, metal layer and resin layer in this order along the thickness direction. Examples of materials for the heat-sealable layer include olefin resins such as polypropylene (PP) and polyethylene (PE). Examples of materials for the metal layer include aluminum, aluminum alloys and stainless steel. Examples of materials for the resin layer include polyethylene terephthalate (PET) and nylon. The thickness of the heat-sealable layer is, for example, 40 μm to 100 μm. The thickness of the metal layer is, for example, 30 μm to 60 μm. The thickness of the resin layer is, for example, 20 μm to 60 μm. The thickness of the laminate film is, for example, 80 μm to 250 μm.

[0042] The battery in this disclosure is typically a lithium-ion secondary battery. Applications of the battery include, for example, powering vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), battery electric vehicles (BEVs), gasoline-powered vehicles, and diesel-powered vehicles. It is particularly preferable for the battery to be used as a power source for hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), or electric vehicles (BEVs). Furthermore, the battery in this disclosure may be used as a power source for mobile devices other than vehicles (e.g., railways, ships, aircraft), or as a power source for electrical products such as information processing devices.

[0043] 3. Battery manufacturing method The method for manufacturing a battery in this disclosure is not particularly limited as long as it is a method that can manufacture the battery described above. Figure 10 is a schematic perspective view illustrating the method for manufacturing a battery in this disclosure. First, as shown in Figure 10(a), negative electrode active material layers 2 are formed on both sides of the negative electrode current collector 5. One method for forming the negative electrode active material layers is to apply a slurry containing the material for the negative electrode active material layer onto the negative electrode current collector and dry it. Next, as shown in Figure 10(b), an electrolyte layer (not shown), a positive electrode active material layer (not shown), and a positive electrode current collector 4 are arranged on the two negative electrode active material layers 2, respectively, to obtain a laminate α.

[0044] Subsequently, as shown in Figure 10(c), multiple laminates α are stacked in the stacking direction D L The materials are stacked to create a laminated body β. Next, as shown in Figure 10(d), the tip of the positive electrode tab 4t is joined to create a laminated connection part W, and the main surface of the laminated connection part W is joined to the inner surface S1 of the current collector terminal 30. Methods for creating the laminated connection part W include, for example, welding methods such as laser welding and electron beam welding, methods using conductive paste, and methods using solder. The method for joining the main surface of the laminated connection part W to the inner surface S1 of the current collector terminal 30 is the same as the method for creating the laminated connection part W. Next, as shown in Figure 10(e), a spacer member 50 is placed on the side surface of the electrode body. Next, as shown in Figure 10(f), the normal direction of the inner surface S1 and outer surface S2 of the current collector terminal 30 is the stacking direction D. L The current collection terminal 30 is rotated so that it is perpendicular to the direction. Then, the same process is performed on the negative electrode tab (not shown), and the resulting components are covered with a single laminate film so that a portion of the two opposing current collection terminals (at least the outer surface of each) is exposed, thereby obtaining a battery.

[0045] This disclosure is not limited to the embodiments described above. The embodiments described above are illustrative, and any configuration that is substantially identical to the technical idea described in the claims of this disclosure and achieves similar effects is included within the technical scope of this disclosure. [Explanation of Symbols]

[0046] 1...Cathode active material layer 2...Negative electrode active material layer 3...Electrolyte layer 4...Positive electrode current collector 5...Negative electrode current collector 10...Electrode body 20... Current collection tab 30...Current collector terminal 40... Laminating film 50...Spacer member 100...battery

Claims

1. Electrode body and Multiple current-collecting tabs extending from the side surface of the electrode body, The current collection terminal connected to the aforementioned multiple current collection tabs, A laminate film that houses the electrode body and the plurality of current collecting tabs, A battery having, The current collection tab has a connection portion for connecting to the current collection terminal, Each of the plurality of current-collecting tabs has a laminated connection portion which is stacked in the thickness direction, The current collection terminal has an inner surface facing the side surface of the electrode body and a side surface arranged along the outer edge of the inner surface, The laminate film is placed on the side surface of the current collection terminal. The laminated connecting portion is joined to the inner surface, A spacer member is placed between the inner surface and the side surface. A battery in which, in a plan view in the stacking direction of the electrode bodies, the spacer member is positioned so as not to overlap with the plurality of current-collecting tabs.

2. Electrode body and Multiple current-collecting tabs extending from the side surface of the electrode body, The current collection terminal connected to the aforementioned multiple current collection tabs, A laminate film that houses the electrode body and the plurality of current collecting tabs, A battery having, The current collection tab has a connection portion for connecting to the current collection terminal, Each of the plurality of current-collecting tabs has a laminated connection portion which is stacked in the thickness direction, The current collection terminal has an inner surface facing the side surface of the electrode body and a side surface arranged along the outer edge of the inner surface, The laminate film is placed on the side surface of the current collection terminal. The laminated connecting portion is joined to the inner surface, A spacer member is placed between the inner surface and the side surface. The spacer member is in contact with at least one of the inner surface and the side surface of the battery.

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