Battery

Abstract

The present disclosure provides a battery in which generation of a short circuit is suppressed. This battery is provided with: an electrode body in which a positive electrode and a negative electrode are alternately laminated in a first direction with a separator interposed therebetween; a laminated outer body; a first tab that protrudes from the laminated outer body in one direction of a second direction orthogonal to the first direction; and a second tab that protrudes from the laminated outer body in the other direction of the second direction. The positive electrode current collector of the positive electrode has first burrs. The negative electrode current collector of the negative electrode has second burrs. This battery satisfies the following (A) or (B). (A) The plurality of first burrs do not include a pair of first burrs in which adjacent first burrs protrude in different directions, and the plurality of second burrs do not include a pair of second burrs in which adjacent second burrs protrude in different directions. (B) The plurality of first burrs include only one pair of first burrs in which the protruding directions of adjacent first burrs are different, and the plurality of second burrs include only one pair of second burrs in which the protruding directions of adjacent second burrs are different.

Description

Technical Field

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

[0002] Japanese Patent Publication No. 2019-53917 discloses an electrochemical element (hereinafter also referred to as a "battery"). The battery has an electrode body, and the electrode body is formed by stacking the positive electrode, the negative electrode and the separator in the thickness direction in a manner that the separator is located between the positive electrode and the negative electrode. The positive electrode has a positive electrode collector and a positive electrode active material layer provided on the positive electrode collector. The negative electrode has a negative electrode collector and a specific negative electrode active material layer provided on the negative electrode collector. The positive electrode collector has a positive electrode collector exposure portion. The positive electrode collector exposure portion exposes the positive electrode collector and is located at the end of the positive electrode. The positive electrode collector exposure portion is arranged so that a portion overlaps with the negative electrode through the separator when viewed from above. In the electrode body, a spacer is provided at the end where the positive electrode collector exposure portion is located, and at the portion where the end of the positive electrode collector exposure portion located on the outer peripheral side of the electrode body overlaps with the negative electrode when viewed from above. The spacer has electrical insulation. The spacing portion is provided between the positive electrode current collector exposed portion and the separator to maintain a spacing in a stacking direction of the positive electrode current collector exposed portion and the separator.

[0003] The positive electrode collector and the negative electrode collector are usually cut into predetermined sizes. At this time, burrs protruding in the thickness direction of each end of the positive electrode collector and the negative electrode collector are sometimes generated. In Japanese Patent Publication No. 2019-53917, there is no research on the situation of configuring the positive electrode collector and the negative electrode collector separately in consideration of the directions in which the burrs of each of the positive electrode collector and the negative electrode collector protrude. Therefore, the positive electrode collector and the negative electrode collector are physically in contact due to the burrs, and there is a concern that a short circuit will occur inside the electrode body. Summary of the invention

[0004] The present disclosure provides a battery in which short circuit generation is suppressed.

[0005] The battery of the first mode of the present disclosure comprises: an electrode body formed by alternately stacking a positive electrode including a positive electrode collector and a negative electrode including a negative electrode collector along a first direction with a separator therebetween; a laminated outer casing accommodating the electrode body; a first pole tab protruding from the laminated outer casing in one direction of a second direction orthogonal to the first direction and electrically connected to a plurality of the positive electrode collectors; and a second pole tab protruding from the laminated outer casing in the other direction of the second direction and electrically connected to a plurality of the negative electrode collectors, the positive electrode collector having a first burr protruding in the first direction at an edge on the second pole tab side, and the negative electrode collector having a second burr protruding in the first direction at an edge on the first pole tab side, and the battery satisfies the following requirement (A) or requirement (B). Requirement (A): The plurality of first burrs do not include a pair of the first burrs whose adjacent first burrs protrude in different directions, and the plurality of second burrs do not include a pair of the second burrs whose adjacent second burrs protrude in different directions; Requirement (B): The plurality of first burrs include only a pair of the first burrs whose adjacent first burrs protrude in different directions, and the plurality of second burrs include only a pair of the second burrs whose adjacent second burrs protrude in different directions.

[0006] The "laminated outer casing" refers to a housing made of a laminated sheet. The "laminated sheet" refers to a sheet having at least a metal layer, a first resin layer laminated on one main surface of the metal layer, and a second resin layer laminated on the other main surface of the metal layer.

[0007] Hereinafter, when the positive electrode current collector and the negative electrode current collector are not distinguished, the positive electrode current collector or the negative electrode current collector is also referred to as the "current collector". When the first burr and the second burr are not distinguished, the first burr or the second burr is also referred to as the "burr". When the first pole lug and the second pole lug are not distinguished, the first pole lug or the second pole lug is also referred to as the "pole lug".

[0008] The battery of the first aspect satisfies the requirement (A) or the requirement (B).

[0009] When the battery of the first embodiment satisfies the requirement (A), in the battery having a laminated outer casing with a single cup structure, the current collectors can be regularly arranged in a manner such that the protruding directions of the burrs are consistent. Therefore, compared with a structure in which the current collectors are irregularly arranged, it becomes difficult for adjacent positive electrode current collectors and negative electrode current collectors to physically contact each other. As a result, in the battery of the first embodiment, the occurrence of a short circuit is suppressed.

[0010] When the battery of the first mode satisfies requirement (B), in the battery having a laminated outer casing with a double cup structure, the position of a pair of burrs in the first direction can be adjusted to the same position as the position of the pole ear in the first direction. Thus, the collector is regularly arranged in a manner that the protruding directions of a plurality of burrs located on one side of the first direction relative to the pair of burrs are consistent in a specific direction. Moreover, the collector can be regularly arranged in a manner that the protruding directions of a plurality of burrs located on the other side of the first direction relative to the pair of burrs are consistent in a specific direction opposite to the specific direction. Therefore, compared with a structure in which the collectors are irregularly arranged, it becomes difficult for adjacent positive electrode collectors and negative electrode collectors to physically contact each other. As a result, in the battery of the first mode, the occurrence of a short circuit is suppressed.

[0011] The "single cup structure laminated outer package" refers to a laminated outer package having a fold line, a cup portion (recessed portion) capable of housing the entire electrode body, and a flat portion, wherein the laminated outer package is bent along the fold line so that the flat portion covers the recessed portion.

[0012] "Double cup structure" refers to a laminated outer packaging body having a bending line, a first cup portion (recessed portion) capable of accommodating a portion of an electrode body, and a second cup portion (recessed portion) capable of accommodating a portion of an electrode body, and being able to accommodate the entire electrode body in a space formed by the overlapping of the first cup portion and the second cup portion by bending along the bending line.

[0013] A second aspect of the present disclosure may further include a plurality of electrical insulating members covering each of the first burr and the second burr in the above-mentioned first aspect.

[0014] Thus, in the second embodiment of the battery, compared with a structure without an electrical insulating member, the first burr becomes less likely to physically contact the negative electrode collector, and the second burr of the negative electrode collector becomes less likely to physically contact the positive electrode collector. As a result, in the second embodiment of the battery, short circuit generation can be more reliably suppressed.

[0015] A third aspect of the present disclosure may satisfy requirement (A) in the above-mentioned first aspect or second aspect.

[0016] A fourth aspect of the present disclosure may satisfy requirement (B) in the above-mentioned first aspect or second aspect.

[0017] According to the present disclosure, a battery in which occurrence of a short circuit is suppressed is provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Illustrative embodiments are described in detail with reference to the following drawings.

[0019] Figure 1 It is a front view of the battery according to the first exemplary embodiment of the present disclosure.

[0020] Figure 2yes Figure 1 Cross-sectional view along line II-II.

[0021] Figure 3 It is a front view of a battery according to a second exemplary embodiment of the present disclosure.

[0022] Figure 4 yes Figure 3 Cross-sectional view along line IV-IV in FIG. DETAILED DESCRIPTION

[0023] Hereinafter, exemplary embodiments of the present disclosure will be described. These descriptions and examples are intended to illustrate the exemplary embodiments and do not limit the scope of the exemplary embodiments.

[0024] In the present disclosure, a combination of two or more preferred aspects is a more preferred aspect.

[0025] In the present disclosure, a numerical range expressed using "to" means a range including the numerical values ​​described before and after "to" as a lower limit and an upper limit.

[0026] In the numerical ranges recorded in stages in the present disclosure, the upper limit or lower limit recorded in one numerical range may also be replaced by the upper limit or lower limit of another numerical range recorded in stages. In the numerical ranges recorded in the present disclosure, the upper limit or lower limit of the numerical range may also be replaced by the value shown in the embodiments.

[0027] Hereinafter, exemplary embodiments of the battery disclosed herein will be described with reference to the accompanying drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

[0028] (1) First Exemplary Embodiment

[0029] like Figure 1 As shown, a battery 1A according to a first exemplary embodiment of the present disclosure includes an electrode body 10A, a laminated outer casing 20A, a positive electrode tab 30 as an example of a first tab, a negative electrode tab 40 as an example of a second tab, a non-aqueous electrolyte (not shown), and a plurality of electrical insulating members 50. The battery 1A is a rectangular parallelepiped object.

[0030] In this exemplary embodiment, the long side direction of the main surface of the battery 1A is the X-axis direction, the short side direction of the main surface of the battery 1A is the Y-axis direction, and the thickness direction of the battery 1A is the Z-axis direction. The X-axis, the Y-axis, and the Z-axis are each orthogonal to each other. The Z-axis is an example of the first direction. The X-axis is an example of the second direction. The Y-axis is an example of the third direction. Furthermore, these directions do not limit the directions of the battery of the present disclosure when it is used.

[0031] The laminated outer casing 20A accommodates the electrode assembly 10A, the nonaqueous electrolyte, and the electrical insulating member 50. The positive electrode tab 30 protrudes from the laminated outer casing 20A in the positive direction of the X axis. The negative electrode tab 40 protrudes from the laminated outer casing 20A in the negative direction of the X axis.

[0032] The length L1 of the battery 1A in the X-axis direction (see Figure 1 ) is, for example, 530 mm to 600 mm. The length L2 of the battery 1A in the Y-axis direction (see Figure 1 ) is, for example, 80 mm to 110 mm. The length L3 of the battery 1A in the Z-axis direction (see Figure 2 ) For example, 7.0mm to 9.0mm.

[0033] (1.1) Electrode body

[0034] The structure of the electrode body 10A is a stacked type. Figure 2 As shown, the electrode body 10A includes a plurality of positive electrodes 11, a plurality of negative electrodes 12, and a plurality of separators 13. The electrode body 10A is formed by alternately stacking the positive electrodes 11 and the negative electrodes 12 with the separators 13 interposed therebetween in the Z-axis direction.

[0035] The number of each of the positive electrode 11 , the negative electrode 12 , and the separator 13 is not particularly limited, and can be appropriately selected depending on the purpose of the battery 1A and the like.

[0036] (1.1.1) Positive electrode

[0037] The positive electrode 11 has a positive electrode current collector 111A (such as aluminum foil) and a positive electrode active material layer 112 supported by both sides of the positive electrode current collector 111A. The positive electrode active material layer 112 contains a positive electrode active material. The positive electrode active material releases lithium ions into the non-aqueous electrolyte or absorbs lithium ions from the non-aqueous electrolyte. The positive electrode active material is a known positive electrode active material (such as LiNiO2, LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 The positive electrode active material layer 112 may further contain a known conductive material (such as carbon black), trilithium phosphate, and a known binder (such as polyvinylidene fluoride).

[0038] In the first exemplary embodiment, the plurality of positive current collectors included in the electrode body 10A are composed only of the positive current collector 111A. The positive current collector 111A has a positive burr B111A as an example of a first burr at the edge on the negative electrode tab 40 side. The positive burr B111A protrudes in the negative direction of the Z-axis direction. The positive burrs of the plurality of positive current collectors included in the electrode body 10A do not include a pair of positive burrs whose adjacent positive burrs protrude in different directions.

[0039] (1.1.2) Negative electrode

[0040] The negative electrode 12 has a negative electrode collector 121A (such as copper foil, etc.) and a negative electrode active material layer 122 supported by both sides of the negative electrode collector 121A. The negative electrode active material layer 122 contains a negative electrode active material. The negative electrode active material absorbs lithium ions as charge carriers from the non-aqueous electrolyte and releases them to the non-aqueous electrolyte during charging and discharging. The negative electrode active material can be a known negative electrode active material (artificial graphite, lithium alloy (such as LiXM, M is C, Si, Sn, Sb, Al, Mg, Ti, Bi, Ge, Pb or P, etc., X is a natural number)). The negative electrode active material layer 122 may also contain a known binder (such as styrene butadiene copolymer, etc.).

[0041] In the first exemplary embodiment, the plurality of negative electrode current collectors included in the electrode body 10A are composed only of the negative electrode current collector 121A. The negative electrode current collector 121A has a negative electrode burr B121A as an example of a second burr at the edge on the positive electrode tab 30 side. The negative electrode burr B121A protrudes in the negative direction of the Z-axis direction. In the first exemplary embodiment, the negative electrode burrs of the plurality of negative electrode current collectors included in the electrode body 10A do not include a pair of negative electrode burrs whose adjacent negative electrode burrs protrude in different directions.

[0042] (1.1.3) Diaphragm

[0043] The separator 13 electrically insulates the positive electrode 11 and the negative electrode 12, and provides a path for lithium ions to move between the positive electrode active material layer 112 and the negative electrode active material layer 122. As the separator 13, a porous film or the like can be cited. As the material of the porous film, for example, polyethylene, polypropylene, etc. can be cited. The separator 13 can be a single-layer structure or a multi-layer structure.

[0044] (1.2) Laminated outer body

[0045] The laminated outer package 20A covers the electrode body 10A, and seals the electrode body 10A and the non-aqueous electrolyte together with the positive electrode tab 30 and the negative electrode tab 40. In the first exemplary embodiment, the laminated outer package 20A is a single cup structure. The laminated outer package 20A is configured so that the positive electrode tab 30 and the negative electrode tab 40 are respectively located at the ends of the laminated outer package 20A on the negative side of the Z axis. The laminated outer package 20A has a laminated sheet 21 and a plurality of tab films 22. The plurality of tab films 22 are each fused to the positive electrode tab 30 or the negative electrode tab 40 and the laminated sheet 21.

[0046] (1.2.1) Laminated Sheet

[0047] The laminate 21 has a metal layer, an inner resin layer and an outer resin layer. The inner resin layer is laminated on the surface of the metal layer on the electrode body 10A side. The outer resin layer is laminated on the surface of the metal layer on the side opposite to the electrode body 10A side. The metal layer isolates the gas (such as moisture, air, etc.) outside the battery 1A from the inside of the battery 1A. The material of the metal layer is metal (such as aluminum, etc.). The inner resin layer electrically insulates the electrode body 10A, the positive electrode tab 30 and the negative electrode tab 40 from the metal layer. The inner resin layer may also contain a thermoplastic resin. The outer resin layer improves the durability of the laminate 21. The outer resin layer may also contain a thermoplastic resin. Examples of the thermoplastic resins of the inner resin layer and the outer resin layer include olefin resins (such as polypropylene, polyethylene, etc.), polyvinyl chloride, polyvinylidene chloride, etc.

[0048] (1.2.2) Ear membrane

[0049] The tab film 22 has the function of electrically insulating the laminate sheet 21 from the positive electrode tab 30 and the negative electrode tab 40, and the function of bonding the laminate sheet 21 to the positive electrode tab 30 and the negative electrode tab 40. The tab film 22 contains a thermoplastic resin. As the thermoplastic resin of the tab film 22, the same materials as those exemplified as the thermoplastic resins of the inner resin layer and the outer resin layer can be cited.

[0050] (1.3) Positive electrode tab

[0051] The positive electrode tab 30 is electrically connected to the plurality of positive electrode current collectors 111A. Examples of the material of the positive electrode tab 30 include metal (for example, stainless steel (SUS)). The length L4 of the positive electrode tab 30 in the Y-axis direction (see Figure 1 ) For example, 40mm~50mm.

[0052] (1.4) Negative electrode tab

[0053] The negative electrode tab 40 is electrically connected to the plurality of negative electrode current collectors 121A. Examples of the material of the negative electrode tab 40 include metal (for example, stainless steel (SUS)). The length L5 of the negative electrode tab 40 in the Y-axis direction (see Figure 1 ) For example, 40mm~50mm.

[0054] (1.5) Non-aqueous electrolyte

[0055] The battery 1A has a non-aqueous electrolyte. The non-aqueous electrolyte is contained in the laminated outer casing 20A together with the electrode body 10A. The non-aqueous electrolyte is a solution in which a supporting salt (e.g., LiPF6, etc.) serving as an electrolyte is dissolved or dispersed in a non-aqueous solvent (e.g., ethylene carbonate, etc.). The non-aqueous electrolyte may also contain various additives (e.g., lithium bis(oxalate)borate, etc.).

[0056] (1.6) Electrical insulation components

[0057] The battery 1A includes a plurality of electrical insulating members 50. In the first exemplary embodiment, the plurality of electrical insulating members 50 cover the positive electrode tab 30 of the positive electrode collector 111A located most on the negative side in the Z-axis direction and the negative electrode tab 40 of the negative electrode collector 121A located most on the negative side in the Z-axis direction. The electrical insulating member 50 contains a thermoplastic resin. As the thermoplastic resin of the electrical insulating member 50, the same resin as exemplified as the thermoplastic resin of each of the inner resin layer and the outer resin layer can be cited.

[0058] (1.7) Purpose

[0059] The use of the battery 1A is not particularly limited, and examples thereof include a vehicle power source, a power source for an information processing device (for example, a personal computer, a smartphone, etc.), and a power source for power storage.

[0060] (1.8) Effects

[0061] As reference Figure 1 and Figure 2 As described above, the battery 1A includes the electrode assembly 10A, the laminated exterior body 20A, the positive electrode tab 30, and the negative electrode tab 40. The battery 1A satisfies the following requirement (A).

[0062] Requirement (A): The plurality of positive electrode burrs do not include a pair of adjacent positive electrode burrs protruding in different directions, and the plurality of negative electrode burrs do not include a pair of adjacent negative electrode burrs protruding in different directions.

[0063] As a result, the positive electrode current collector 111A is regularly arranged in a manner that the protruding direction of the positive electrode burr B111A is consistent. Therefore, compared with a structure in which the positive electrode current collector 111A is irregularly arranged, it becomes difficult for the adjacent positive electrode current collector 111A and negative electrode current collector 121A to physically contact each other. The same is true for the negative electrode current collector 121A. As a result, the occurrence of a short circuit is suppressed in the battery 1A.

[0064] As reference Figure 1 and Figure 2 As described above, the battery 1A further includes the electrical insulating member 50 .

[0065] As a result, in the battery 1A, the positive electrode burr B111A of the positive electrode collector 111A is less likely to come into physical contact with the negative electrode collector 121A, and the negative electrode burr B121A of the negative electrode collector 121A is less likely to come into physical contact with the positive electrode collector 111A, compared with a structure without the electrical insulating member 50. As a result, in the battery 1A, the occurrence of a short circuit is more reliably suppressed.

[0066] (2) Second Exemplary Embodiment

[0067] The battery 1B according to the second exemplary embodiment of the present disclosure is similar to the battery 1A according to the first exemplary embodiment except that the laminated outer casing has a double cup structure and the plurality of burrs include a pair of burrs having different burr protruding directions.

[0068] like Figure 3 As shown, the battery 1B includes an electrode body 10B, a laminated outer casing 20B, a positive electrode tab 30 , a negative electrode tab 40 , a non-aqueous electrolyte (not shown), and a plurality of electrical insulating members 50 .

[0069] (2.1) Electrode body

[0070] The electrode body 10B is the same as the electrode body 10A, except that the plurality of burrs include a pair of burrs having different protruding directions of the burrs.

[0071] In the second exemplary embodiment, the plurality of positive current collectors included in the electrode body 10B include a plurality of positive current collectors 111A and a plurality of positive current collectors 111B. The positive current collector 111B includes a positive burr B111B. The positive burr B111B protrudes in the positive direction of the Z-axis direction. The plurality of positive current collectors 111A are located on the positive direction side of the Z-axis direction relative to the negative electrode tab 40. The plurality of positive current collectors 111B are located on the negative direction side of the Z-axis direction relative to the negative electrode tab 40. That is, in the second exemplary embodiment, near the position of the negative electrode tab 40 in the Z-axis direction, there is only a pair of positive burrs B111P (refer to Figure 4 ). A pair of positive electrode burrs B111P is composed of a positive electrode burr B111A of the positive electrode current collector 111A and a positive electrode burr B111B of the positive electrode current collector 111B.

[0072] In the second exemplary embodiment, the plurality of negative electrode collectors included in the electrode body 10B include a plurality of negative electrode collectors 121A and a plurality of negative electrode collectors 121B. The negative electrode collector 121B includes a negative electrode burr B121B. The negative electrode burr B121B protrudes in the positive direction of the Z-axis direction. The plurality of negative electrode collectors 121A are located on the positive direction side of the Z-axis direction relative to the positive electrode tab 30. The plurality of negative electrode collectors 121B are located on the negative direction side of the Z-axis direction relative to the positive electrode tab 30. That is, in the second exemplary embodiment, near the position of the positive electrode tab 30 in the Z-axis direction, there is only a pair of positive electrode burrs B111P (refer to Figure 4 The pair of negative electrode current collectors 121P includes a negative electrode current collector B121A of the negative electrode current collector 121A and a negative electrode current collector B121B of the negative electrode current collector 121B (see Figure 4 )constitute.

[0073] (2.2) Laminated outer body

[0074] The laminated outer casing 20B is the same as the laminated outer casing 20A of the first exemplary embodiment except for the double cup structure. The laminated outer casing 20B is configured such that the positive electrode tab 30 and the negative electrode tab 40 are each located at the center of the laminated outer casing 20A in the Z-axis direction.

[0075] (2.3) Electrical insulation components

[0076] The battery 1B includes a plurality of electrical insulating members 50. In the second exemplary embodiment, the plurality of electrical insulating members 50 are connected to the positive electrode tab 30 of the two positive electrode collectors 111A located in the center in the Z-axis direction (the two positive electrode collectors 111A close to the negative electrode tab 40 in the Z-axis direction) and the negative electrode tab 40 of the negative electrode collector 121A located in the center in the Z-axis direction (the two negative electrode collectors 121A close to the positive electrode tab 30 in the Z-axis direction).

[0077] (2.4) Effects

[0078] As reference Figure 3 and Figure 4 As described above, the battery 1B includes an electrode body 10B, a laminated outer body 20B, a positive electrode tab 30, and a negative electrode tab 40. The plurality of positive electrode collectors included in the electrode body 10B include a plurality of positive electrode collectors 111A and a plurality of positive electrode collectors 111B. The plurality of negative electrode collectors included in the electrode body 10B include a plurality of negative electrode collectors 121A and a plurality of negative electrode collectors 121B. The battery 1B satisfies the following requirement (B).

[0079] Requirement (B): The plurality of positive electrode burrs include only one pair of positive electrode burrs B111P, and the plurality of negative electrode burrs include only one pair of negative electrode burrs B121P.

[0080] Thus, the positive electrode collector 111A is regularly arranged in a manner that the protruding directions of a plurality of positive electrode burrs B111A located on the positive direction side of the Z axis with respect to a pair of positive electrode burrs B111P are consistent in the negative direction of the Z axis. Moreover, the positive electrode collector 111B can be regularly arranged in a manner that the protruding directions of a plurality of positive electrode burrs B111B located on the negative direction of the Z axis with respect to a pair of positive electrode burrs B111P are consistent in the positive direction of the Z axis. The negative electrode collector 121A is regularly arranged in a manner that the protruding directions of a plurality of negative electrode collectors 121A located on the positive direction side of the Z axis with respect to a pair of negative electrode collectors 121P are consistent in the negative direction of the Z axis. Moreover, the negative electrode collector 121B can be regularly arranged in a manner that the protruding directions of a plurality of negative electrode collectors B121B located on the negative direction of the Z axis with respect to a pair of negative electrode collectors B121P are consistent in the positive direction of the Z axis. Therefore, compared with a structure in which positive electrode collectors 111A, positive electrode collectors 111B, negative electrode collectors 121A, and negative electrode collectors 121B are arranged irregularly, adjacent positive electrode collectors and negative electrode collectors are less likely to come into physical contact with each other. As a result, in battery 1B, occurrence of a short circuit is suppressed.

[0081] As reference Figure 3 and Figure 4 As described above, the battery 1B further includes the electrical insulating member 50 .

[0082] Thus, in the battery 1B, the positive electrode burrs of the positive electrode collector are less likely to physically contact the negative electrode collector, and the negative electrode burrs of the negative electrode collector are less likely to physically contact the positive electrode collector, compared to a structure without the electrical insulating member 50. As a result, the occurrence of a short circuit is more reliably suppressed in the battery 1B.

[0083] (2) Modification

[0084] Although each of the battery 1A and the battery 1B includes a plurality of electrical insulating members 50 , the present disclosure is not limited thereto. The battery of the present disclosure may not include a plurality of electrical insulating members 50 .

Claims

1. A battery having: An electrode body including a plurality of positive electrodes having a positive electrode current collector and a plurality of negative electrodes having a negative electrode current collector, wherein the plurality of positive electrodes and the plurality of negative electrodes are alternately stacked along a first direction via a separator; a laminated outer package housing the electrode assembly; A first electrode tab protruding from the laminated outer casing in a second direction perpendicular to the first direction and electrically connected to the plurality of positive electrode current collectors; as well as a second electrode tab protruding from the laminated outer casing in the other direction of the second direction and electrically connected to the plurality of negative electrode current collectors; The positive electrode current collector has a first burr protruding in the first direction at an edge of the second electrode tab side. The negative electrode current collector has a second burr protruding in the first direction at an edge on the first tab side. The battery satisfies the following requirement (A) or requirement (B): Requirement (A): The plurality of first burrs do not include a pair of adjacent first burrs having different protruding directions, and The plurality of second burrs do not include a pair of adjacent second burrs having different protruding directions; Requirement (B): The plurality of first burrs include only a pair of adjacent first burrs having different protruding directions, and The plurality of second burrs include only a pair of second burrs in which adjacent ones of the second burrs have different protruding directions. 2 . The battery according to claim 1 , further comprising a plurality of electrical insulating members covering each of the first burr and the second burr.

3. The battery according to claim 1 or 2, satisfying the requirement (A). The battery according to claim 1 or 2, satisfying the requirement (B).

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