Battery

Abstract

To provide a battery in which a laminate film is less likely to be damaged even when a load is applied to the battery in a direction in which a current collector terminal is pushed into an electrode body side.SOLUTION: In a battery having an electrode body 10, a plurality of current collector tabs 20 extending from a side surface portion of the electrode body, a current collector terminal 30 connected to the plurality of current collector tabs, and a laminate film 40 for accommodating the electrode body and the plurality of current collector tabs, the current collector tab has a root portion X that is an end portion on the electrode body side, a connection portion Y for connecting to the current collector terminal, and an intermediate portion Z connecting the root portion and the connection portion. The plurality of current collector tabs have a laminated connection portion W in which the connection portions thereof are laminated in a thickness direction, and the current collector terminal has an inner surface S1 facing the side surface portion S10 of the electrode body, and a side surface disposed along the outer edge of the inner surface. A laminate film is disposed on the side surface of the current collector terminal, the main surface of the laminated connection portion is bonded to the inner surface, and a spacer member 50 is disposed between the inner surface and the side surface.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to batteries. [Background technology]

[0002] A battery such as a lithium ion secondary battery usually includes an electrode body 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 body is sealed by an exterior body. Electricity generated in the electrode body is led from the inside of the exterior body to the outside by a current collecting terminal. For example, Patent Document 1 discloses a stacked or stacked / folded electrode assembly having a positive electrode / separator / negative electrode structure. Also, FIG. 2 of Patent Document 1 discloses that a plurality of tabs (e.g., positive electrode tabs 40) are joined in a dense form and connected to a lead (e.g., positive electrode lead 60). Furthermore, Patent Document 1 discloses the use of a laminate sheet (laminate film) as the exterior body. Similarly, Patent Documents 2 and 3 also disclose the use of a laminate film as the exterior body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5550805 [Patent Document 2] JP 2011-108623 A [Patent Document 3] JP 2020-115423 A Summary of the Invention [Problem to be solved by the invention]

[0004] Batteries using laminate films are weak against loads in the direction in which the current collector terminals are pushed into the electrode body, and when such loads are applied to the battery, the laminate film is likely to be damaged.

[0005] The present disclosure has been made in consideration of the above-mentioned situation, and has as its main object to provide a battery in which damage to the laminate film is unlikely to occur even when a load is applied to the battery in a direction in which the current collecting terminal is pushed into the electrode body. [Means for solving the problem]

[0006] [1] a laminate film that houses the electrode body and the multiple current collecting tabs, wherein the current collecting tab has a root portion that is an end portion on the electrode body side, a connection portion for connecting to the current collecting terminal, and an intermediate portion that connects the root portion and the connection portion, the multiple current collecting tabs have a laminated connection portion in which the connection portions are laminated in a thickness direction, the current collecting terminal has an inner surface that faces the side portion of the electrode body and a side surface that is arranged along an outer edge of the inner surface, the laminate film is arranged on the side of the current collecting terminal, a main surface of the laminated connection portion is joined to the inner surface, and a spacer member is arranged 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 portions have a curved structure in which parts of the intermediate portions face each other.

[0008] [3] The battery according to [1] or [2], wherein the spacer member is a resin member.

[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 has a first spacer member and a second spacer member as the spacer members, and the multiple current collecting tabs are arranged between the first spacer member and the second spacer member in a planar view in the stacking direction of the electrode body. Effect of the Invention

[0011] The present disclosure has an effect of providing a battery in which damage to the laminate film is unlikely to occur even when a load is applied to the battery in a direction in which the current collecting terminal is pushed into the electrode body. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic perspective view illustrating a battery according to the present disclosure. [Diagram 2] 1A and 1B are schematic plan and side views illustrating a battery according to the present disclosure. [Diagram 3] 2(b) is a cross-sectional view taken along line AA and line BB in FIG. [Figure 4] 1A and 1B are a schematic plan view and a schematic cross-sectional view illustrating a conventional battery. [Diagram 5] 1A and 1B are a schematic plan view and a schematic cross-sectional view illustrating a battery according to the present disclosure. [Figure 6] FIG. 2 is a schematic perspective view illustrating a current collecting terminal according to the present disclosure. [Figure 7] 1 is a schematic plan view illustrating a spacer member according to the present disclosure. [Figure 8] 1 is a schematic cross-sectional view illustrating a spacer member according to the present disclosure. [Figure 9] 1 is a schematic cross-sectional view illustrating an electrode body according to the present disclosure. [Figure 10] 1 is a schematic perspective view illustrating a method for manufacturing a battery according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The battery of the present disclosure will be described in detail below with reference to the drawings. Each of the drawings shown below is a schematic illustration, and the size and shape of each part are appropriately exaggerated to facilitate understanding. Furthermore, hatching of each part may be omitted as appropriate.

[0014] FIG. 1 is a schematic perspective view illustrating a battery in the present disclosure. FIGS. 2(a) and 2(b) are schematic plan views illustrating a battery in the present disclosure, and FIG. 2(c) is a schematic side view illustrating a battery in the present disclosure. As shown in FIGS. 1 and 2, a battery 100 includes an electrode body 10 and a side portion S of the electrode body 10. 10 The electrode body 10 has a plurality of current collecting tabs 20 extending therefrom, a current collecting terminal 30 (a first current collecting terminal 30A and a second current collecting terminal 30B) connected to the plurality of current collecting tabs 20, and a laminate film 40 that houses the electrode body 10 and the plurality of current collecting tabs 20.

[0015] Fig. 3(a) is a cross-sectional view taken along line AA in Fig. 2(b), and Fig. 3(b) is a cross-sectional view taken along line BB in Fig. 2(b). As shown in Fig. 3(a), the current collecting tab 20 has a root portion X which is the end portion on the electrode body 10 side, a connection portion Y for connecting to the current collecting terminal 30, and an intermediate portion Z which connects the root portion X and the connection portion Y. The current collecting tabs 20 also have a stacked connection portion W in which the connection portions Y are stacked in the thickness direction (the vertical direction in Fig. 3). The current collecting terminal 30 is connected to the side portion S of the electrode body 10. 10 3(a) does not show side surface S4 and side surface S6. As shown in FIG. 2(c), a laminate film 40 is disposed on the four side surfaces S3 to S6. As shown in FIG. 3(a), the main surface of the laminated connection portion W is joined to the inner surface S1 of the current collecting terminal 30. Also, as shown in FIG. 3(b), the inner surface S1 of the current collecting terminal 30 and the side surface portion S of the electrode body 10 are joined to each other. 10 A spacer member 50 is disposed between them.

[0016] According to the present disclosure, by using a current collecting terminal having a predetermined inner surface and a spacer member, even if a load is applied to the battery in a direction in which the current collecting terminal is pushed into the electrode body side, the laminate film is unlikely to break. Here, FIG. 4(a) is a schematic plan view illustrating a conventional battery, and FIG. 4(b) is an AA cross-sectional view of FIG. 4(a). FIG. 5(a) is a schematic plan view illustrating a battery in the present disclosure, and FIG. 5(b) is an AA cross-sectional view of FIG. 5(a). As shown in FIGS. 4(a) and (b), in the conventional battery, when a load is applied in a direction in which the current collecting terminal 30 is pushed into the electrode body 10 side (black arrow), the laminate film 40 is likely to break. The reason is that the rigidity of the current collecting terminal 30 is high in the load direction, and the rigidity of the current collecting tab 20 and the laminate film 40 is low. 5(a) and (b), in the present disclosure, a current collecting terminal 30 is used that has an inner surface S1 with which the main surface of the stacked joint W can make surface contact. 10 A spacer member 50 is disposed between the current collecting tabs 20 and the current collecting terminal 30. Therefore, even if a load is applied in a direction (black arrow) in which the current collecting terminal 30 is pushed toward the electrode body 10, the presence of the spacer member 50 suppresses deformation due to the load, and further, the large-area inner surface S1 bends, dispersing the stress caused by the load. In particular, as described below, when the multiple current collecting tabs 20 have a curved structure, the multiple current collecting tabs 20 also bend at the same time as the current collecting terminal 30 bends, thereby further dispersing the stress caused by the load. Therefore, even if a load is applied to the battery in a direction in which the current collecting terminal is pushed toward the electrode body, the laminate film is less likely to break.

[0017] 1. Battery configuration The battery according to the present disclosure includes an electrode body, a plurality of current collecting tabs extending from a side portion of the electrode body, a current collecting terminal connected to the plurality of current collecting tabs, and a laminate film that houses the electrode body and the plurality of current collecting tabs. The battery according to the present disclosure further includes a spacer member between an inner surface of the current collecting terminal and the side portion of the electrode body.

[0018] (1) Electrode body The electrode body in the present disclosure usually includes 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 it is preferable that the electrode body has, for example, a top surface portion, a bottom surface portion facing the top surface portion, and four side surfaces connecting the top surface portion and the bottom surface portion. The shape of the top surface portion is not particularly limited, but examples thereof include quadrangles such as a square, a rectangle, a rhombus, a trapezoid, and a parallelogram. The shape of the top surface portion may be a polygon other than a quadrangle, or may be a shape having a curve such as a circle. The shape of the bottom surface portion is the same as that of the top surface portion. The shape of the side surface portion is not particularly limited, but examples thereof include quadrangles such as a square, a rectangle, a rhombus, a trapezoid, and a parallelogram.

[0019] (2) Multiple current collecting tabs In the present disclosure, the multiple current collecting tabs are arranged to extend from the side surface of the electrode assembly. The "side surface of the electrode assembly" refers to a portion that constitutes the electrode assembly and whose normal direction intersects with the stacking direction of the electrode assembly. For example, in FIG. 3(a), the side surface S of the electrode assembly 10 10 The normal direction (vertical direction in the drawing) is perpendicular to the stacking direction (horizontal direction in the drawing) of the electrode body 10. Moreover, the "stacking direction of the electrode body" refers to the thickness direction of each layer constituting the electrode body.

[0020] As shown in FIG. 3(a), the current collecting tab 20 has a root portion X, which is an end portion on the electrode body 10 side, a connection portion Y for connecting to the current collecting terminal 30, and an intermediate portion Z connecting the root portion X and the connection portion Y. The root portion X is an end portion (boundary portion) of the current collecting tab 20 on the electrode body 10 side. The connection portion Y is a portion for connecting to the current collecting terminal 30, and is a portion constituting a stacked connection portion W described later. The intermediate portion Z is a portion connecting the root portion X and the connection portion Y. In the present disclosure, the multiple current collecting tabs have a stacked connection portion in which the respective connection portions are stacked in the thickness direction. In FIG. 3(a), each connection portion Y of the multiple current collecting tabs 20 is stacked in the thickness direction of the current collecting tab 20, thereby forming the stacked connection portion W. In the stacked connection portion W, each connection portion Y is joined to each other (fixed to each other).

[0021] As shown in FIG. 3(a), in a cross-sectional view of the electrode body 10 in the stacking direction, the intermediate portion Z preferably has a curved structure (area indicated by a broken line) in which parts of the intermediate portion Z are curved to face each other. In FIG. 3(a), the intermediate portion Z of the rightmost current collecting tab 20 among the multiple current collecting tabs 20 does not have the above-mentioned curved structure because parts of the intermediate portion Z do not face each other, but the intermediate portions Z of the other multiple current collecting tabs 20 all have a curved structure. In this way, it is preferable that the intermediate portion Z of at least one current collecting tab 20 among the multiple current collecting tabs 20 has a curved structure. In the curved structure, parts of the opposing intermediate portions Z may be arranged to be in direct contact with each other, or may be arranged with a space therebetween. In addition, as shown in FIG. 3, the intermediate portions Z of the multiple current collecting tabs 20 are preferably curved in a U-shape.

[0022] (3) Current collector terminal The current collecting terminal in the present disclosure 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 shape of the inner surface is not particularly limited, and examples thereof include quadrangles such as squares, rectangles, rhombuses, trapezoids, and parallelograms. The number of sides is, for example, multiple. The number of sides depends on, for example, the shape of the outer edge of the inner surface. For example, when the shape of the outer edge of the inner surface is a quadrangle, the current collecting terminal may have four sides. The current collecting terminal may 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, the side surface, and the outer surface may each be a flat surface or a curved surface.

[0023] As shown in Fig. 6, the current collecting terminal 30 may have an inner surface S1, 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. As shown in Fig. 2(b), the opposing direction of the electrode body 10 and the current collecting terminal 30 is designated as D1, and the direction perpendicular to the direction D1 is designated as D2. Also, as shown in Fig. 2(c), the direction perpendicular to both the direction D1 and the direction D2 is designated as D3. The direction D3 is usually the stacking direction D of the electrode body 10. L As shown in FIG. 6, the length of the current collecting terminal 30 in the direction D1 is L1, the length of the current collecting terminal 30 in the direction D2 is L2, and the length of the current collecting terminal 30 in the direction D3 is L3. L2 may be greater than L1. The ratio of L2 to L1 (L2 / L1) is, for example, 2 or more, 5 or more, or 10 or more. L2 may be greater than L3. The ratio of L2 to L3 (L2 / L3) is, for example, 5 or more, 10 or more, or 50 or more. L1 may be greater than L3. The ratio of L1 to L3 (L1 / L3) is, for example, 2 or more, 5 or more, or 10 or more.

[0024] Although not shown in the figure, the length of the electrode body in the direction D1 is L X The length of the electrode body in the direction D2 is L Y The length of the electrode body in the direction D3 is L Z Let us assume that L X The ratio of L1 to L X ) is not particularly limited. Y The ratio of L2 to L Y ) is, for example, 0.8 or more, may be 0.9 or more, or may be 0.95 or more. Y For example, L is less than or equal to 1.0. Z The ratio of L3 to L Z ) is, for example, 0.8 or more, may be 0.9 or more, or may be 0.95 or more. Z is, for example, less than or equal to 1.0.

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

[0026] As shown in FIG. 3(a), the main surface of the laminate connection part W is joined to the inner surface S1 of the current collecting terminal 30. The "main surface of the laminate connection part W" refers to a surface that constitutes the laminate connection part W and whose normal direction coincides with the thickness direction of the connection part Y. The main surface of the laminate connection part W may be joined to the inner surface S1 in direct contact therewith, or may be joined via another member (e.g., a conductive layer). The inner surface S1 of the current collecting terminal 30 and the laminate connection part W are usually joined to each other (fixed to each other).

[0027] (4) Spacer member The spacer member in the present disclosure is disposed between the inner surface of the current collecting terminal and the side surface of the electrode assembly. The battery in the present disclosure may have one spacer member for one current collecting terminal, or may have multiple spacer members. In addition, the spacer member is preferably in surface contact with the inner surface of the current collecting terminal. Similarly, the spacer member is preferably in surface contact with the side surface of the electrode assembly.

[0028] FIG. 7 is a schematic plan view illustrating a spacer member in the present disclosure. As shown in FIG. 7(a), in a plan view of the stacking direction of the electrode body 10, a plurality of current collecting tabs 20 are arranged between the first spacer member 50A and the second spacer member 50B. In this case, when a load occurs in a direction in which the current collecting terminal is pushed toward the electrode body, the stress is easily dispersed. As shown in FIG. 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, the plurality of current collecting tabs 20 can be prevented from contacting the spacer member 50, and damage to the plurality of current collecting tabs 20 can be prevented. Also, as shown in FIG. 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 FIG. 7(b), the spacer member 50 and the current collecting tabs 20 may be in direct contact with each other. In this case, by firmly fixing the current collecting tabs 20, deformation of the tabs due to a load can be suppressed. Furthermore, the spacer member 50 may be disposed at a position overlapping with the current collecting tabs 20 (for example, a position inside the curved U-shape shown in FIG. 3(a)). As shown in FIG. 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. As shown in FIG. 7(c), the spacer member 50 and the current collecting tabs 20 may be in direct contact with each other, and further, the electrode body 10 and the spacer member 50 may be flush with each other in the direction D2. As shown in FIG. 7(d), the battery may have one spacer member 50 for one current collecting terminal 30.

[0030] 8A and 8B are schematic cross-sectional views illustrating a spacer member according to the present disclosure. As shown in FIG. 8A, in a cross-sectional view of the electrode assembly 10 in the stacking direction, the spacer member 50 is disposed between the side surface S 10In Fig. 8(a), a space is provided between the inner surface S1 of the current collecting terminal 30 and the spacer member 50. Also, as shown in Fig. 8(b), in a cross-sectional view of the electrode assembly 10 in the stacking direction, the spacer member 50 may be in contact with the inner surface S1 of the current collecting terminal 30. In Fig. 8(b), the side surface S 10 3B, the spacer member 50 is in contact with the inner surface S1 of the current collecting terminal 30 and is spaced apart from the side surface S of the electrode assembly 10. 10 It may also be in contact with

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

[0032] (5) Laminate film The laminate film in the present disclosure houses the electrode body and the multiple current collecting tabs. In FIG. 2(b), the laminate film 40 covers the electrode body 10, the multiple current collecting tabs 20, and the spacer member 50. As shown in FIGS. 2(b) and 2(c), the laminate film 40 covers a part of each of the side surfaces S3 to S6 of the current collecting terminal 30. As shown in FIG. 2(c), the laminate film 40 is disposed on each of the side surfaces S3 to S6. The side surfaces and the laminate film may be in direct contact with each other, or may be disposed via another member (for example, a resin layer for improving adhesion). Meanwhile, as shown in FIG. 1, a seal portion 41 in which the laminate films 40 are fused together is disposed along the opposing direction D1 of the electrode body 10 and the current collecting terminal 30.

[0033] 2. Battery components The battery according to the present disclosure includes at least an electrode body, a current collecting tab, a current collecting terminal, a spacer member, and a laminate film.

[0034] The electrode body in the present disclosure usually includes a generating 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 usually has a plurality of generating units stacked in the thickness direction. For example, the electrode body 10 shown in FIG. 9 has a plurality of generating units U stacked in the thickness direction (direction D3). Each generating 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). Adjacent generating 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. The positive electrode active material is, for example, LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 Examples of the conductive material include oxide active materials such as O2. Examples of the conductive material include carbon materials. The electrolyte may be a solid electrolyte or a liquid electrolyte (electrolytic 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 the binder include a rubber-based binder and a fluoride-based binder.

[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 the negative electrode active material include metal active materials such as Li and Si, carbon active materials such as graphite, Li4Ti5O 12Examples of oxide active materials include oxide active materials such as . The conductive material, electrolyte, and binder are the same as those described above. The electrolyte layer is disposed 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 those described above. The electrolyte layer may have a separator.

[0037] The positive electrode current collector collects the current of the positive electrode active material layer. Examples of the material of the positive electrode current collector include metals such as aluminum, SUS, and nickel. Examples of the shape of the positive electrode current collector include a foil shape. The negative electrode current collector collects the current of the negative electrode active material layer. Examples of the material of the negative electrode current collector include metals such as copper, SUS, and nickel. Examples of the shape of the negative electrode current collector include a foil shape.

[0038] The battery of the present disclosure has a positive electrode tab and a negative electrode tab as current collecting tabs. As shown in FIG. 9, the positive electrode tab 4t is connected to the side surface S of the electrode assembly 10. 10 From the electrode assembly 10, the positive electrode tab 4t extends in a direction intersecting the stacking direction (direction D3) of the electrode assembly 10. As shown in FIG. 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 assembly 10, the positive electrode tab 4t is disposed at a position not overlapping with the positive electrode active material layer 1. In FIG. 9, the negative electrode tab 5t extends from the side surface of the electrode assembly 10 in a direction intersecting the stacking direction (direction D3) of the electrode assembly 10. Details of the negative electrode tab are similar to those of the positive electrode tab, so they will not be described here. As shown in FIG. 9, the positive electrode tab 4t may extend from one side surface of the electrode assembly 10, and the negative electrode tab 5t may extend from the other side surface of the electrode assembly 10 (double tab structure). On the other hand, although not particularly shown, the positive electrode tab and the negative electrode tab may extend from the same side surface of the electrode assembly (single tab structure).

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

[0040] The spacer member in the present disclosure is disposed between the inner surface of the current collecting terminal and the side surface of the electrode body. Examples of the spacer member include a resin member, a rubber member, a metal member, a glass member, and a ceramic member. Examples of the resin used for the resin member include polyolefins such as polyethylene and polypropylene, and polyimides. 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 the present disclosure has at least a structure in which a heat-sealing layer and a metal layer are laminated. The laminate film may have a heat-sealing layer, a metal layer, and a resin layer in this order along the thickness direction. Examples of the material of the heat-sealing layer include olefin resins such as polypropylene (PP) and polyethylene (PE). Examples of the material of the metal layer include aluminum, aluminum alloys, and stainless steel. Examples of the material of the resin layer include polyethylene terephthalate (PET) and nylon. The thickness of the heat-sealing layer is, for example, 40 μm or more and 100 μm or less. The thickness of the metal layer is, for example, 30 μm or more and 60 μm or less. The thickness of the resin layer is, for example, 20 μm or more and 60 μm or less. The thickness of the laminate film is, for example, 80 μm or more and 250 μm or less.

[0042] The battery in the present disclosure is typically a lithium-ion secondary battery. Examples of uses of the battery include power sources for vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), electric vehicles (BEVs), gasoline-powered vehicles, and diesel-powered vehicles. In particular, the battery is preferably used as a driving power source for hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), or electric vehicles (BEVs). The battery in the present disclosure may also be used as a power source for moving objects other than vehicles (e.g., railways, ships, and aircraft), and may also be used as a power source for electrical products such as information processing devices.

[0043] 3. Battery manufacturing method The method for manufacturing a battery in the present disclosure is not particularly limited as long as it can manufacture the above-mentioned battery. FIG. 10 is a schematic perspective view illustrating a method for manufacturing a battery in the present disclosure. First, as shown in FIG. 10(a), a negative electrode active material layer 2 is formed on each of both sides of a negative electrode current collector 5. As a method for forming the negative electrode active material layer, for example, a method of applying a slurry containing a material for the negative electrode active material layer onto the negative electrode current collector and drying it can be mentioned. Next, as shown in FIG. 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] Then, as shown in FIG. 10(c), the plurality of laminates α are stacked in the stacking direction D L 10(d), the tip of the positive electrode tab 4t is joined to form a laminated joint W, and the main surface of the laminated joint W is joined to the inner surface S1 of the current collecting terminal 30. Examples of a method for forming the laminated joint W include a method using welding such as laser welding and electron beam welding, a method using a conductive paste, and a method using solder. The method for joining the main surface of the laminated joint W to the inner surface S1 of the current collecting terminal 30 is the same as the method for forming the laminated joint W. Next, as shown in FIG. 10(e), a spacer member 50 is disposed on the side portion of the electrode body. Next, as shown in FIG. 10(f), a spacer member 50 is disposed on the side portion of the electrode body. Next, as shown in FIG. 10(f), a normal direction of the inner surface S1 and the outer surface S2 of the current collecting terminal 30 is aligned in the stacking direction D. L The current collecting terminal 30 is rotated so that it is perpendicular to the current collecting terminal 30. The negative electrode tab (not shown) is then subjected to the same treatment, and the obtained member is covered with a laminate film so that a portion of the two opposing current collecting terminals (at least the outer surfaces of each) is exposed, thereby obtaining a battery.

[0045] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are merely examples, and anything that has substantially the same configuration as the technical idea described in the claims of the present disclosure and exhibits similar effects is included in the technical scope of the present 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 collecting tab 30...Current collector terminal 40...Laminate film 50...Spacer member 100...battery

Claims

1. An electrode body; a plurality of current collecting tabs extending from a side portion of the electrode body; a current collecting terminal connected to the plurality of current collecting tabs; a laminate film that houses the electrode body and the multiple current collecting tabs; A battery having the current collecting tab has a root portion which is an end portion on the electrode body side, a connection portion for connecting to the current collecting terminal, and an intermediate portion connecting the root portion and the connection portion, The connection portions of each of the current collecting tabs have a laminated connection portion in which the connection portions are laminated in a thickness direction, the current collecting terminal has an inner surface facing the side surface portion of the electrode body and a side surface disposed along an outer edge of the inner surface, The laminate film is disposed on the side surface of the current collecting terminal, A main surface of the laminated joint portion is joined to the inner surface, A spacer member is disposed between the inner surface and the side surface, The spacer member is arranged at a position not overlapping with the current collecting tabs in a plan view in a stacking direction of the electrode body.

2. An electrode body, a plurality of current collecting tabs extending from a side portion of the electrode body; a current collecting terminal connected to the plurality of current collecting tabs; a laminate film that houses the electrode body and the multiple current collecting tabs; A battery having the current collecting tab has a root portion which is an end portion on the electrode body side, a connection portion for connecting to the current collecting terminal, and an intermediate portion connecting the root portion and the connection portion, The connection portions of each of the current collecting tabs have a laminated connection portion in which the connection portions are laminated in a thickness direction, the current collecting terminal has an inner surface facing the side surface portion of the electrode body and a side surface disposed along an outer edge of the inner surface, The laminate film is disposed on the side surface of the current collecting terminal, A main surface of the laminated joint portion is joined to the inner surface, A spacer member is disposed 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.

3. The battery according to claim 1 , wherein, in a cross-sectional view of the electrode body in the stacking direction, the intermediate portions have a curved structure in which parts of the intermediate portions face each other.

4. The battery according to claim 1 , wherein the spacer member is a resin member.

5. the battery includes a first spacer member and a second spacer member as the spacer member, 3 . The battery according to claim 1 , wherein the current collecting tabs are disposed between the first spacer member and the second spacer member in a plan view in a stacking direction of the electrode assembly.

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