Battery and manufacturing method of the battery

Abstract

To provide a battery having an excellent structure efficiency.SOLUTION: A battery of a present disclosure, comprises: an electrode lamination body containing a plurality of electrodes; a sealing frame; and a non-aqueous electrolyte. The electrode includes: a collector; and at least one of a positive electrode and a negative electrode. The electrode includes an uncoating step. The sealing frame includes a sealing frame member deposed to at least one part of the uncoating part of at least one of a one surface and the other surface of the collector of each of the plurality of electrodes. A battery satisfies the following (A) or (B): (A) the sealing frame further provide a spacer, the spacer has a convex-like portion, the sealing member has a concave-like portion, and a convex-like portion is fitted to the concave-like portion; and (B) the sealing member is deposed to at least one pf the uncoated part of one of the one surface and the other surface of the collector, the sealing frame member has an extension part, the extension part is directly contacted to the adjacent sealing frame member.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a battery and a method for manufacturing the battery.

Background Art

[0002] Patent Document 1 discloses a method for manufacturing an energy storage device (hereinafter also referred to as a "battery"). The manufacturing method includes a preparation step, a melting step, and a specific molding step. In the preparation step, a laminate is prepared. The laminate includes a plurality of current collectors provided with active material layers and a plurality of sealing members. The sealing member has a frame shape surrounding the active material layer as viewed from the thickness direction of the current collector and has an extending portion extending outward from the outer edge of the current collector. The sealing member is disposed between each of the plurality of current collectors. In the welding step, the plurality of sealing members are melted by non-contact heating to form a side surface including a communication port formed of the plurality of sealing members and communicating the inside and outside of the laminate.

[0003] Specifically, in the preparation step, the laminate 900 shown in FIG. 9 is prepared. The laminate 900 includes a plurality of electrode units 910, a plurality of separators 920, and a plurality of spacers 930. The electrode unit 910, the separator 920, and the spacer 930 are laminated in this order along the lamination direction D1. The electrode unit 910 has a bipolar electrode 911 and a sealing member 912. The bipolar electrode 911 has a current collector 9111, a positive electrode active material layer 9112, and a negative electrode active material layer 9113. The positive electrode active material layer 9112 is provided on one surface S9111A of the current collector 9111. The negative electrode active material layer 9113 is provided on the other surface S9111B of the current collector 9111. The sealing member 912 is joined to one surface S9111A and the other surface S9111B of the current collector 9111 at the peripheral edge of the current collector 9111. One surface S912 of the sealing member 912 is a flat surface. One surface S930 of the spacer 930 is a flat surface. Therefore, a gap G is formed between one surface S912 of the sealing member 912 and one surface S930 of the spacer 930.

[0004] In the welding process, as shown in FIG. 9, infrared rays are irradiated onto the side surface S900 of the laminate 900 using the infrared heater 800, and the interface between the sealing member 912 and the spacer 930 is welded and integrated. Thereby, the sealing portion 940 is formed. Next, a specific molding process is performed. Thereby, the battery 901 shown in FIG. 10 is obtained.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] When all regions of the interface between the sealing member 912 and the spacer 930 are welded, if a thermal cycle test is performed on the battery 901, cracks may occur in the sealing portion 940 due to the volume change of the sealing portion 940. The “thermal cycle test” refers to a test in which the battery 901 is alternately exposed to a high-temperature atmosphere and a low-temperature atmosphere a plurality of times. If cracks occur in the sealing portion 940, there is a risk of leakage of the non-aqueous electrolyte. That is, the sealing performance of the battery 901 may not be sufficient.

[0007] The inventor has experimentally confirmed that making the length of the welding region of the sealing member 912 (for example, the region where the interface between the sealing member 912 and the spacer 930 is welded) (hereinafter also referred to as “welding length”) shorter than the length L901 between the side surface S901 of the battery 901 and the end surface of the current collector 9111 in the direction D2 orthogonal to the lamination direction D1 is effective in suppressing the occurrence of cracks in the sealing portion 940. This is presumably because, compared to the case where all regions of the interface between the sealing member 912 and the spacer 930 are welded, the stress caused by the volume change is less likely to be locally applied to the sealing portion 940.

[0008] On the one hand, in the laminate 900, the current collector 9111 does not exist at the periphery of the electrode unit 910. Therefore, the thickness at the periphery of the electrode unit 910 is thinner than the thickness at the central portion of the electrode unit 910. Further, as shown in FIG. 9, a gap G is formed at the periphery of the laminate 900. As a result, when the welding process is performed, the melt of the sealing member 912 or the spacer 930 may flow into the gap G, and the shape of the periphery of the laminate 900 may be deformed. That is, the side surface of the battery 901 formed by the sealing portion 940 may be inclined. Therefore, in the laminate 900, it is difficult to control the welding length in order to obtain a battery 901 having excellent sealing performance (in order to suppress the occurrence of cracks in the sealing portion 940).

[0009] On the other hand, in order to obtain a battery 901 having excellent sealing performance, it may be considered to design such that the length L901 (see FIG. 10) becomes longer. However, the sealing member 912 and the spacer 930 do not directly contribute to the battery reaction. Therefore, designing such that the length L901 (see FIG. 10) becomes longer leads to a decrease in the structural efficiency of the battery 901. "Structural efficiency" refers to the ratio of the volume of the electrode body where the battery reaction occurs to the total volume of the battery.

[0010] Therefore, there is a demand for a battery having excellent structural efficiency. Further, there is a demand for a battery manufacturing method capable of manufacturing a battery having excellent structural efficiency.

[0011] The present disclosure has been made in view of the above circumstances. The problem to be solved by one embodiment of the present disclosure is to provide a battery having excellent structural efficiency. The problem to be solved by another embodiment of the present disclosure is to provide a battery manufacturing method capable of manufacturing a battery having excellent structural efficiency and excellent sealing performance.

Means for Solving the Problems

[0012] The means for solving the above problems include the following embodiments.

[0013] <1>The battery according to the first aspect includes an electrode laminate including a plurality of electrodes laminated in a stacking direction via a separator, a sealing frame that seals a side circumferential surface of the electrode laminate and forms a housing portion between adjacent electrodes among the plurality of electrodes, a non-aqueous electrolyte housed in the housing portion, and the electrode has a current collector and at least one of a positive electrode layer and a negative electrode layer, and the electrode has an uncoated portion where the positive electrode layer and the negative electrode layer are not formed on one surface and the other surface of the current collector, the sealing frame has a sealing frame member welded to at least a part of the uncoated portion of at least one of one surface and the other surface of the current collector of each of the plurality of electrodes, and satisfies the following (A) or (B). (A): The sealing frame further includes a spacer disposed between two adjacent sealing frame members among the plurality of sealing frame members, the spacer has a first planar portion and a convex portion protruding from the first planar portion in the stacking direction at a portion in contact with each of the two adjacent sealing frame members, the sealing frame member has a second planar portion in contact with the first planar portion and a concave portion recessed from the second planar portion in the stacking direction at a portion in contact with each of the two adjacent spacers, and the convex portion is fitted into the concave portion (B): The sealing frame member is welded to at least a part of one of the uncoated portions of one surface and the other surface of the current collector, the sealing frame member has an extending portion extending in a surface direction of the current collector orthogonal to the stacking direction from the current collector, and the extending portion is in direct contact with an adjacent sealing frame member

[0014] The battery according to the first aspect satisfies (A) or (B). When the battery of the first aspect satisfies (A), the convex portion of the spacer is fitted into the concave portion of the sealing frame member. That is, it is difficult to form a gap at the interface between the spacer and the sealing frame member. Therefore, when welding the sealing frame member, the shape of the sealing frame member is difficult to deform. As a result, the side surface of the battery constituted by the sealing frame becomes a vertical surface. Consequently, the battery of the first aspect has excellent structural efficiency. When the battery of the first aspect satisfies (B), the extending portion is in direct contact with the adjacent sealing frame member. That is, it is difficult to form a gap at the interface between two adjacent sealing frame members of the sealing frame member. Therefore, when welding the sealing frame member, the shape of the sealing frame member is difficult to deform. As a result, the side surface of the battery constituted by the sealing frame becomes a vertical surface. Consequently, the battery of the first aspect has excellent structural efficiency.

[0015] <2>The battery of the second aspect is When satisfying the above (A), in a cross-section cut along a direction parallel to the stacking direction, in a direction orthogonal to the stacking direction, the length from the side surface of the sealing frame at the portion where the interface between the spacer and the sealing frame member is welded is shorter than the length from the side surface of the sealing frame to the current collector, When satisfying the above (B), in a cross-section cut along a direction parallel to the stacking direction, in a direction orthogonal to the stacking direction, the length from the side surface of the sealing frame at the portion where the interface between the adjacent sealing frame members is welded is shorter than the length from the side surface of the sealing frame to the current collector, and the battery according to <1>.

[0016] In the second aspect, when satisfying (A), compared with the case where all regions of the interface between the sealing frame member and the spacer are welded, the stress caused by the volume change is less likely to be locally applied to the sealing portion. As a result, even when a thermal cycle test is performed on the battery of the second aspect, cracks are less likely to occur in the sealing frame. That is, the battery of the second aspect has excellent sealing performance. In the second aspect, when (B) is satisfied, compared with the case where all regions of the interface between two adjacent sealing frame members of the sealing frame member are welded, the stress caused by volume change is less likely to be locally applied to the sealing portion. As a result, even when a thermal cycle test is performed on the battery of the second aspect, cracks are less likely to occur in the sealing frame. That is, the battery of the second aspect has excellent sealing performance.

[0017] <3>The battery of the third aspect of the present disclosure is satisfying the above (A), The battery according to <1> or <2> above, wherein the height in the stacking direction of the convex portion from the first flat portion of the spacer is 0.25 times or more and 1 time or less the thickness of the current collector.

[0018] Thereby, in the battery of the third aspect, the adhesion between the spacer and the sealing frame member is superior to a configuration in which the height in the stacking direction of the convex portion from the first flat portion of the spacer is outside the range of 0.25 times or more and 1 time or less the thickness of the current collector.

[0019] <4>The battery of the fourth aspect of the present disclosure is satisfying the above (B), The sealing frame member has a protruding portion protruding from the welding surface with the current collector in the extending portion, The battery according to <1> or <2> above, wherein the thickness in the stacking direction of the protruding portion from the welding surface is 1 time or more and 2 times or less the thickness of the current collector.

[0020] Thereby, in the battery of the fourth aspect, the adhesion between two adjacent sealing frame members is superior to a configuration in which the thickness in the stacking direction of the protruding portion from the welding surface is outside the range of 1 time or more and 2 times or less the thickness of the current collector.

[0021] <5>The manufacturing method of the battery of the fifth aspect of the present disclosure is A method for manufacturing the battery according to any one of <1> to <3> satisfying the above (A), preparing an electrode sheet including the electrode, the sealing frame member, and the separator welded to the sealing frame member, and the spacer; Repeatedly perform a lamination operation to form the electrode laminate and the sealing frame. having wherein the lamination operation laminates the spacer on the electrode sheet, heats the periphery of the laminated spacer from the lamination direction, and welds it to the electrode sheet. laminates the electrode sheet on the spacer, heats the periphery of the sealing frame member of the laminated electrode sheet from the lamination direction, and welds it to the spacer, which is a method for manufacturing a battery.

[0022] The manufacturing method of the fifth aspect includes repeatedly performing a lamination operation to form an electrode laminate and a sealing frame. As a result, the manufacturing method of the fifth aspect can manufacture a battery that satisfies (A). Here, the manufacturing method of the fifth aspect heats the periphery of the sealing frame member of the laminated electrode sheet from the lamination direction and welds it to the electrode sheet, and then further laminates the electrode sheet and heats the periphery of the sealing frame member of the laminated electrode sheet from the lamination direction to weld it to the spacer. By performing heating and welding from the lamination direction, it becomes easier to control the length of the welded portion. Therefore, it is not necessary to design a longer welding length (for example, length L901 in FIG. 10) to ensure the sealing property, and the structural efficiency of the battery is improved. As a result, the manufacturing method of the fifth aspect can manufacture a battery having excellent structural efficiency and excellent sealing property.

[0023] <6>The manufacturing method of the battery according to the sixth aspect of the present disclosure is a method for manufacturing a battery according to any one of <1>, <2>, and <4> that satisfies (B), preparing an electrode sheet including the electrode, the sealing frame member, and the separator welded to the sealing frame member, repeatedly performing a lamination operation to form the electrode laminate and the sealing frame, having The stacking operation includes stacking the electrode sheet on the electrode sheet and heating the periphery of the sealing frame member of the stacked electrode sheet from the stacking direction to weld it to the electrode sheet, which is a method for manufacturing a battery.

[0024] Furthermore, the manufacturing method of the sixth aspect includes repeatedly performing a stacking operation to form an electrode laminate and a sealing frame. Thereby, the manufacturing method of the sixth aspect can manufacture a battery that satisfies the above (B). Here, the manufacturing method of the sixth aspect heats the periphery of the sealing frame member of the stacked electrode sheet from the stacking direction and welds it to the electrode sheet, and then further stacks the electrode sheet and heats the periphery of the sealing frame member of the stacked electrode sheet from the stacking direction to weld it to the spacer. By performing heating and welding from the stacking direction, it becomes easier to control the length of the welded portion. Therefore, it is not necessary to design the welding length (for example, the length L901 in FIG. 10) to be long to ensure the sealing property, and the structural efficiency of the battery is improved. As a result, the manufacturing method of the sixth aspect can manufacture a battery having excellent structural efficiency and excellent sealing property.

Effects of the Invention

[0025] According to an embodiment of the present disclosure, a battery having excellent structural efficiency is provided. According to another embodiment of the present disclosure, a method for manufacturing a battery capable of manufacturing a battery having excellent structural efficiency and excellent sealing property is provided.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

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Figure 9

Figure 10

MODE FOR CARRYING OUT THE INVENTION

[0027] In the present disclosure, a numerical range indicated by "~" means a range including the numerical values described before and after "~" as the minimum value and the maximum value, respectively. In the numerical ranges described stepwise in the present disclosure, the upper limit value or the lower limit value described in a certain numerical range may be replaced with the upper limit value or the lower limit value of the numerical range described in other stepwise descriptions. In the present disclosure, a combination of two or more preferred embodiments is a more preferred embodiment. In the present disclosure, the term "step" includes not only an independent step but also a step that cannot be clearly distinguished from other steps as long as the intended purpose of the step is achieved.

[0028] Hereinafter, embodiments of the battery and the method of manufacturing the battery of the present disclosure will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and the description thereof will not be repeated.

[0029] (1) First Embodiment (1.1) Battery As shown in FIG. 1, the battery 1A according to the first embodiment is a rectangular parallelepiped. The battery 1A includes an electrode laminate 10, a sealing frame 20A, and a non-aqueous electrolyte (not shown). The sealing frame 20A seals the side peripheral surface S10 of the electrode laminate 10.

[0030] In the embodiment, the longitudinal direction of the main surface of the battery 1A is defined as the X-axis direction. The short-side direction of the main surface of the battery 1A is defined as the Y-axis direction. The thickness direction of the battery 1A is defined as the Z-axis direction. Each of the X-axis, Y-axis, and Z-axis is orthogonal to each other. The Z-axis direction is an example of the stacking direction. The Z-axis negative direction and the gravitational direction are parallel. Note that these directions do not limit the orientation during the use of the battery of the present disclosure.

[0031] Each of the length L1 (see FIG. 1) in the X-axis direction and the length L2 (see FIG. 1) in the Y-axis direction of the battery 1A may exceed 1 m.

[0032] (1.1.1) Electrode laminate The electrode laminate 10 is a rectangular parallelepiped. The electrode laminate 10 includes a plurality of bipolar electrodes 11 laminated in the Z-axis direction via separators 12. Specifically, as shown in FIG. 2, the electrode laminate 10 has a plurality of bipolar electrodes 11, a plurality of separators 12, a positive electrode layer side terminal electrode 13, and a negative electrode layer side terminal electrode 14. The plurality of bipolar electrodes 11 and the plurality of separators 12 are alternately laminated along the axial direction. The positive electrode layer side terminal electrode 13 is laminated via a separator 12 on the bipolar electrode 11 that is located most on one side (the positive direction side of the Z-axis direction) in the stacking direction among the plurality of bipolar electrodes 11. The negative electrode layer side terminal electrode 14 is laminated via a separator 12 on the bipolar electrode 11 that is located most on the other side (the negative direction side of the Z-axis direction) in the stacking direction among the plurality of bipolar electrodes 11.

[0033] (1.1.1.1) Bipolar electrode As shown in FIG. 3, the bipolar electrode 11 includes a current collector 110, a positive electrode layer 111, and a negative electrode layer 112. The positive electrode layer 111 is formed on the first main surface S110A of the current collector 110. The negative electrode layer 112 is formed on the second main surface S110B of the current collector 110. The bipolar electrode 11 has an uncoated portion R10 on the first surface S110A of the current collector 110 and the second main surface S110B of the current collector 110. The positive electrode layer 111 and the negative electrode layer 112 are not formed on the uncoated portion R10. The uncoated portion R10 includes the peripheral edge R110 (see FIG. 3) of the current collector 110. The bipolar electrode 11 may have a known configuration. The first main surface S110A of the current collector 110 is an example of one surface of the current collector. The second main surface S110B of the current collector 110 is an example of the other surface of the current collector.

[0034] During discharge or charging of the battery 1A, the current collector 110 supplies current to the positive electrode layer 111 and the negative electrode layer 112. Examples of the material of the current collector 110 include metal foil, conductive resin material, or conductive inorganic material. Examples of the metal foil include aluminum foil, copper foil, nickel foil, titanium foil, stainless steel foil, and the like. Examples of the conductive resin material include a resin obtained by adding a conductive filler to a conductive polymer material or a non-conductive polymer material as necessary. A coating layer may be formed on the surface of the current collector 110. The coating layer may be formed by a known method (for example, plating treatment, spray coating, etc.). The thickness of the current collector 110 may be 1 μm to 100 μm.

[0035] The positive electrode layer 111 includes a positive electrode layer active material (for example, a lithium composite metal oxide having a layered rock salt structure, a metal oxide having a spinel structure, a polyanion-based compound, etc.) capable of occluding and releasing charge carriers. The thickness (length in the Z-axis direction) of the positive electrode layer 111 may be 2 μm to 500 μm.

[0036] The negative electrode layer 112 contains a negative electrode layer active material (for example, carbon, a compound capable of alloying with lithium, etc.) that can occlude and release charge carriers. Examples of carbon include natural graphite, artificial graphite, hard carbon (graphitization-resistant carbon), or soft carbon (graphitizable carbon). Examples of artificial graphite include highly oriented graphite, mesocarbon microbeads, etc. Examples of elements capable of alloying with lithium include silicon or tin. The thickness (length in the Z-axis direction) of the negative electrode layer 112 may be 2 μm to 500 μm. The thickness of the negative electrode layer 112 may be the same as or different from the thickness of the positive electrode layer 111.

[0037] Each of the positive electrode layer 111 and the negative electrode layer 112 may further contain a conductive assistant for enhancing electron conductivity, a binder, an electrolyte support salt (lithium salt) for enhancing ion conductivity, a polymer electrolyte, an additive (for example, trifluoropropylene carbonate, a filler as a reinforcing material, etc.). Examples of the conductive assistant include carbon nanofibers, acetylene black, carbon black, or graphite. Examples of the binder include fluorine-containing resins (polyvinylidene fluoride, polytetrafluoroethylene, fluororubber, etc.), thermoplastic resins (for example, polypropylene, polyethylene, etc.), imide-based resins (for example, polyimide, polyamideimide, etc.), alkoxysilyl group-containing resins, acrylic resins (for example, acrylic acid or methacrylic acid, etc.), styrene-butadiene rubber (SBR), carboxymethyl cellulose, alginates (for example, sodium alginate or ammonium alginate, etc.), water-soluble cellulose ester cross-linked bodies, starch-acrylic acid graft polymers, etc. These binders can be used alone or in combination.

[0038] (1.1.1.2) Separator Separator 12 maintains the distance between the positive electrode layer 111 and the negative electrode layer 112 to prevent the occurrence of a short circuit due to contact, and allows charge carriers such as lithium ions (for example, lithium ions, etc.) to pass through. The periphery of the separator 12 is welded to the sealing frame 20A. The separator 12 is held by the sealing frame 20A. Examples of the separator 12 include a porous resin sheet or a non-woven fabric. Examples of the material of the porous resin sheet include polyolefin (such as polypropylene, polyethylene, etc.) or polyester. Examples of the material of the non-woven fabric include polypropylene, polyethylene terephthalate, or methyl cellulose. The separator 12 may have a known configuration.

[0039] (1.1.1.3) Positive electrode layer side terminal electrode The positive electrode layer side terminal electrode 13 has a current collector 110 and a positive electrode layer 111. The positive electrode layer 111 is formed on the second main surface S110B of the current collector 110. The positive electrode layer side terminal electrode 13 may have a known configuration.

[0040] (1.1.1.4) Negative electrode layer side terminal electrode The negative electrode layer side terminal electrode 14 has a current collector 110 and a negative electrode layer 112. The negative electrode layer 112 is formed on the first main surface S110A of the current collector 110. The negative electrode layer side terminal electrode 14 may have a known configuration.

[0041] (1.1.2) Sealing frame The sealing frame 20A forms an accommodation portion T between adjacent bipolar electrodes 11 among the plurality of bipolar electrodes 11. The positive electrode layer 111, the negative electrode layer 112, and the separator 12 are accommodated in the accommodation portion T in a state of being contained in the non-aqueous electrolyte. The sealing frame 20A prevents the non-aqueous electrolyte accommodated in the accommodation portion T from leaking to the outside. The sealing frame 20A can prevent moisture from entering the accommodation portion T from the outside of the battery 1A.

[0042] The sealing frame 20A is a rectangular tube with a rectangular cross-section. The sealing frame 20A includes a plurality of sealing frame members 21 and a plurality of spacers 22. Each of the plurality of spacers 22 is disposed between two adjacent sealing frame members 21 among the plurality of sealing frame members 21.

[0043] In the first embodiment, a part of the interface between the plurality of sealing frame members 21 and the plurality of spacers 22 is welded. Specifically, in a cross-section cut along a direction parallel to the Z-axis direction, as shown in FIG. 3, in the direction orthogonal to the Z-axis direction, the length L3 (hereinafter, also referred to as "welding length L3") from the side surface S20A of the sealing frame 20A of the part where the interface between the spacer 22 and the sealing frame member 21 is welded is shorter than the length L4 from the side surface S20A of the sealing frame 20A to the current collector 110.

[0044] (1.1.2.1) Sealing Frame Member The sealing frame member 21 is a rectangular tube with a rectangular cross-section. In the first embodiment, the sealing frame member 21 is welded to the peripheries R110 of the first main surface S110A and the second main surface S110B of the current collector 110 of each of the plurality of bipolar electrodes 11.

[0045] The sealing frame member 21 has a flat portion S21A1 and a concave portion S21A2 on a first surface S21A that contacts the spacer 22 disposed on the positive Z-axis side. The flat portion S21A1 is in contact with the flat portion S22B1 of the spacer 22. The concave portion S21A2 is recessed from the flat portion S21A1 in the negative Z-axis direction. The sealing frame member 21 has a flat portion S21B1 and a concave portion S21B2 on a first surface S21B that contacts the spacer 22 disposed on the negative Z-axis side. The flat portion S21B1 is in contact with the flat portion S22A1 of the spacer 22. The concave portion S21B2 is recessed from the flat portion S21B1 in the positive Z-axis direction.

[0046] Examples of the material of the sealing frame member 21 include polyethylene, polystyrene, acrylonitrile-butadiene-styrene copolymer synthetic resin (ABS resin), modified polypropylene, acrylonitrile styrene resin, and the like.

[0047] (1.1.2.2) Spacer The spacer 22 is a rectangular corner tube in cross section.

[0048] The spacer 22 has a flat portion S22A1 and a convex portion S22A2 on a first surface S22A that contacts a sealing frame member 21 disposed on the positive Z-axis side. The convex portion S22A2 protrudes in the positive Z-axis direction from the flat portion S22A1. The spacer 22 has a flat portion S22B1 and a convex portion S22B2 on a second surface S22B that contacts a sealing frame member 21 disposed on the negative Z-axis side. The convex portion S22B2 protrudes in the negative Z-axis direction from the flat portion S22B1.

[0049] The convex portion S22A2 of the spacer 22 is fitted into the concave portion S21B2 of the sealing frame member 21. The convex portion S22B2 of the spacer 22 is fitted into the concave portion S21A2 of the sealing frame member 21.

[0050] In the first embodiment, the height L5 in the Z-axis direction of the convex portion S22A2 from the flat portion S22A1 of the spacer 22 is 0.25 times or more and 1 time or less the thickness of the current collector 110 (i.e., the length of the current collector 110 in the Z direction). In the first embodiment, the height L5 in the Z-axis direction of the convex portion S22B2 from the flat portion S22B1 of the spacer 22 is 0.25 times or more and 1 time or less the thickness of the current collector 110.

[0051] Examples of the material of the spacer 22 include polyethylene, polystyrene, acrylonitrile-butadiene-styrene copolymer synthetic resin (ABS resin), modified polypropylene, acrylonitrile styrene resin, and the like. The material of the spacer 22 may be the same as or different from the material of the sealing frame member 21.

[0052] (1.1.3) Non-aqueous electrolyte The non-aqueous electrolyte is accommodated in the accommodating portion T. The non-aqueous electrolyte may contain a non-aqueous solvent and a lithium salt. Examples of the lithium salt include LiClO 4, LiAsF 6 , LiPF 6 , LiBF 4 , LiCF 3 SO 3 , LiN(FSO 2 ) 2 , LiN(CF 3 SO 2 ) 2 Examples include the like. Examples of the non-aqueous solvent include cyclic carbonates, cyclic esters, chain carbonates, chain esters, ethers, and the like. The non-aqueous electrolyte may contain additives (for example, lithium bis(oxalato)borate, etc.).

[0053] (1.1.4) Applications The battery 1A can be used, for example, as a power source for electric four-wheel vehicles, electric two-wheel vehicles, portable devices, power storage systems, and the like. Examples of electric four-wheel vehicles include battery electric vehicles (BEV), plug-in hybrid electric vehicles (PHEV), and hybrid electric vehicles (HEV). Electric two-wheel vehicles include electric motorcycles or electric assist bicycles. Portable devices include, for example, smartphones, tablet computers, notebook computers, power tools, video cameras, and the like. Power storage systems include home power storage systems, industrial power storage systems, and energy storage systems (ESS).

[0054] (1.2) Manufacturing method The manufacturing method of the battery according to the first embodiment includes a preparation step, a lamination welding step, a depressurization step, and a liquid injection step, which are carried out in this order, thereby obtaining the battery 1A.

[0055] (1.2.1) Preparation step In the preparation step, a plurality of electrode sheets 31A, a plurality of spacers 22, a positive electrode layer side terminal electrode sheet 32A, and a negative electrode layer side terminal electrode sheet 33A are prepared.

[0056] The electrode sheet 31A has a bipolar electrode 11, a sealing frame member 21, and a separator 12. The sealing frame member 21 is welded to the periphery R110 of the first main surface S110A and the second main surface S110B of the current collector 110 of the bipolar electrode 11. The separator 12 is welded to the sealing frame member 21. The positive electrode layer side terminal electrode sheet 32A has a positive electrode layer side terminal electrode 13 and a sealing frame member 21. The sealing frame member 21 is welded to the periphery R110 of the current collector 110 of the positive electrode layer side terminal electrode 13. The negative electrode layer side terminal electrode sheet 33A has a negative electrode layer side terminal electrode 14 and a sealing frame member 21. The sealing frame member 21 is welded to the periphery R110 of the current collector 110 of the negative electrode layer side terminal electrode 14. The preparation method for each of the electrode sheet 31A, the positive electrode layer side terminal electrode sheet 32A, the negative electrode layer side terminal electrode sheet 33A, and the spacer 22 may be a known method.

[0057] (1.2.2) Laminating and welding process In the laminating and welding process, a laminating operation is repeatedly performed to form the electrode laminate 10 and the sealing frame 20A. The laminating operation includes laminating the spacer 22 on the electrode sheet 31A, heating the periphery R22 of the laminated spacer 22 from the Z-axis direction to weld it to the electrode sheet 31A, laminating the electrode sheet 31A on the spacer 22, and heating the periphery R21 of the sealing frame member 21 of the laminated electrode sheet 31A from the Z-axis direction to weld it to the spacer 22.

[0058] Specifically, as shown in FIG. 4, the spacer 22 is laminated on the negative electrode layer side terminal electrode sheet 33A. Next, the periphery R22 of the laminated spacer 22 is heated from the Z-axis direction by the heating device 40 and welded to the negative electrode layer side terminal electrode sheet 33A. Thereby, the negative electrode layer side terminal electrode sheet 33A and the spacer 22 are integrated, and the laminated integrated body 301 is obtained. Next, an electrode sheet 31A is laminated on the spacer 22 of the laminated integrated body 301. Next, the peripheral edge R21 of the sealing frame member 21 of the laminated electrode sheet 31A is heated from the Z-axis direction by a heating device 40 and welded to the spacer 22 of the laminated integrated body 301. As a result, the laminated integrated body 301 and the electrode sheet 31A are integrated, and a laminated integrated body 302 is obtained. Next, a spacer 22 is laminated on the electrode sheet 31A of the laminated integrated body 302. Next, the peripheral edge R22 of the laminated spacer 22 is heated from the Z-axis direction by a heating device 40 and welded to the electrode sheet 31A of the laminated integrated body 302. As a result, the laminated integrated body 303 and the spacer 22 are integrated, and a laminated integrated body 303 is obtained. Such lamination operations are repeated. Finally, a positive electrode layer side terminal electrode sheet 32A is laminated on the spacer 22 of the laminated integrated body. Next, the peripheral edge R21 of the sealing frame member 21 of the laminated positive electrode layer side terminal electrode sheet 32A is heated from the Z-axis direction by a heating device 40 and welded to the spacer 22 of the laminated integrated body. As a result, the laminated integrated body and the positive electrode layer side terminal electrode sheet 32A are integrated, and an electrode laminate 10 and a sealing frame 20A are formed. In other words, a first battery precursor is obtained. The first battery precursor has the same configuration as the battery 1A except that the non-aqueous electrolyte is not contained in the accommodation portion T.

[0059] The heating method of the heating device 40 is not particularly limited as long as it can weld each of the sealing frame member 21 and the spacer 22. For example, laser heating, infrared (IR) heating, microwave heating, induction heating, hot air heating, hot plate heating, or heating roll, etc. can be mentioned. From the viewpoint of accurately controlling the welding length L3, the heating method of the heating device 40 is preferably laser heating.

[0060] (1.2.3) Vacuum reduction process In the vacuum reduction process, the pressure in the accommodation portion T of the first battery precursor is reduced. As a result, the air in the accommodation portion T is discharged to the outside of the first battery precursor. As a result, the non-aqueous electrolyte is easily injected into the accommodation portion T. The method of reducing the pressure in the accommodation portion T may be any known method.

[0061] (1.2.4) Liquid injection process In the liquid injection process, a non-aqueous electrolyte is injected into the housing part T of the first battery precursor. Thereby, the battery 1A is obtained. The method of injecting the non-aqueous electrolyte may be any known method.

[0062] (1.3) Function and effect As described with reference to FIGS. 1 to 4, the battery 1A includes an electrode laminate 10, a sealing frame 20A, and a non-aqueous electrolyte. The bipolar electrode 11 has a current collector 110, a positive electrode layer 111, and a negative electrode layer 112. The sealing frame 20A has a sealing frame member 21 and a spacer 22. The spacer 22 has a flat part S22A1 and a convex part S22A2 on the first surface S22A. The spacer 22 has a flat part S22B1 and a convex part S22B2 on the second surface S22B. The sealing frame member 21 has a flat part S21A1 and a concave part S21A2 on the first surface S21A. The sealing frame member 21 has a flat part S21B1 and a concave part S21B2 on the second surface S21B. The convex part S22A2 is fitted into the concave part S21B2. The convex part S22B2 is fitted into the concave part S21A2. Thereby, it is difficult to form voids at the interface between the spacer 22 and the sealing frame member 21. Therefore, when the sealing frame member 21 is welded, the shape of the sealing frame member 21 is difficult to deform. As a result, the side surface S20A of the battery 1A formed by the sealing frame 20A becomes a vertical surface. As a result, the battery 1A has excellent structural efficiency.

[0063] As described with reference to FIGS. 1 to 4, in the cross-section of the battery 1A cut along a direction parallel to the Z-axis direction, in the direction orthogonal to the Z-axis direction, the welding length L3 (see FIG. 3) is shorter than the length L4 (see FIG. 3). Thereby, compared with the case where all regions of the interface between the sealing frame member 21 and the spacer 22 are welded, the stress caused by the volume change is less likely to be locally applied to the sealing frame 20A. As a result, even when a thermal cycle test is performed on the battery 1A, cracks are less likely to occur in the sealing frame 20A. That is, the battery 1A has excellent sealing performance.

[0064] As described with reference to FIGS. 1 to 4, the height L5 (see FIG. 3) is 0.25 times or more and 1 time or less the thickness of the current collector 110. Thereby, the adhesion between the spacer 22 and the sealing frame member 21 is superior to a configuration in which the height L5 is outside the range of 0.25 times or more and 1 time or less the thickness of the current collector 110.

[0065] As described with reference to FIGS. 1 to 4, the method for manufacturing a battery according to the first embodiment is a method for manufacturing the battery 1A. The manufacturing method includes a preparation step and a lamination welding step. The lamination operation includes laminating the spacer 22 on the electrode sheet 31A, heating the periphery R22 of the laminated spacer 22 from the Z-axis direction to weld it to the electrode sheet 31A, laminating the electrode sheet 31A on the spacer 22, and heating the periphery R21 of the sealing frame member 21 of the laminated electrode sheet 31A from the Z-axis direction to weld it to the spacer 22. Thereby, the manufacturing method of the first embodiment can manufacture the battery 1A having excellent structural efficiency. Further, in the manufacturing method of the first embodiment, by performing heating and welding from the lamination direction (Z-axis direction), it becomes easy to control the welding length L3. Therefore, it is not necessary to design the welding length L3 to be long in order to ensure the sealing property, and the structural efficiency of the battery 1A is improved. As a result, the manufacturing method of the first embodiment can manufacture the battery 1A having excellent structural efficiency and excellent sealing property.

[0066] (2) Second Embodiment (2.1) Battery The battery 1B according to the second embodiment of the present disclosure has substantially the same configuration as the battery 1A according to the first embodiment, except that it does not mainly include a spacer.

[0067] As shown in FIG. 5, the battery 1B includes an electrode laminate 10, a sealing frame 20B, and a non-aqueous electrolyte (not shown). The sealing frame 20B seals the side peripheral surface S10 of the electrode laminate 10.

[0068] (2.1.1) Sealing Frame The sealing frame 20B has substantially the same configuration as the sealing frame 20A, except that it mainly does not include a spacer.

[0069] As shown in FIG. 6, the sealing frame 20B has a plurality of sealing frame members 23. As shown in FIG. 7, the sealing frame members 23 are welded to a part (i.e., the peripheral edge R110) of the non-coated portion R10 of the first surface S110A of the current collector 110. The sealing frame member 23 has an extending portion 230. The extending portion 230 extends in the plane direction of the current collector 110 perpendicular to the Z-axis direction (lamination direction) from the current collector 110. The extending portion 230 is in direct contact with an adjacent sealing frame member 23. That is, no spacer is interposed between adjacent sealing frame members 23.

[0070] In the second embodiment, a part of the interface between adjacent sealing frame members 23 is welded. Specifically, in a cross-section cut along a direction parallel to the Z-axis direction, as shown in FIG. 7, in the direction perpendicular to the Z-axis direction, the length L6 (hereinafter also referred to as the "welding length L6") from the side surface S20B of the sealing frame 20B of the welded part of the interfaces of adjacent sealing frame members 23 is shorter than the length L7 from the side surface S20B of the sealing frame 20B to the current collector 110.

[0071] The sealing frame member 23 is a rectangular square tube in cross-section. In the second embodiment, the sealing frame members 23 are welded to the peripheral edge R110 of the first main surface S110A of each of the plurality of bipolar electrodes 11 of the current collector 110.

[0072] The surface S23A that the sealing frame member 23 arranged on the positive Z-axis direction side of the sealing frame member 23 contacts is a flat surface. The surface S23B that the sealing frame member 23 arranged on the negative Z-axis direction side of the sealing frame member 23 contacts is a flat surface. The sealing frame member 23 is welded to at least a part of at least one of the non-coated portions on one surface and the other surface of the current collector, and the sealing frame member 23 has an extending portion that extends in the plane direction of the current collector from the current collector, and the extending portion is in direct contact with an adjacent sealing frame member.

[0073] In the second embodiment, the sealing frame member has a protruding portion 231 that protrudes from the welding surface S23 with the current collector 110 in the extending portion 230. The thickness L8 (see FIG. 7) in the Z-axis direction (lamination direction) from the welding surface S23 is 1 time or more and 2 times or less the thickness of the current collector 110 (the length of the current collector 110 in the Z-axis direction).

[0074] Examples of the material of the sealing frame member 23 include polyethylene, polystyrene, acrylonitrile-butadiene-styrene copolymer synthetic resin (ABS resin), modified polypropylene, acrylonitrile styrene resin, and the like.

[0075] (2.1.2) Applications The applications of the battery 1B are the same as those exemplified for the applications of the battery 1A.

[0076] (2.2) Manufacturing method The manufacturing method of the battery according to the second embodiment includes a preparation step, a lamination welding step, a depressurization step, and a liquid injection step. The preparation step, the lamination welding step, the depressurization step, and the liquid injection step are carried out in this order. Thereby, the battery 1B is obtained.

[0077] (2.2.1) Preparation step In the preparation step, a plurality of electrode sheets 31B, a plurality of spacers 22, a positive electrode layer side terminal electrode sheet 32B, and a negative electrode layer side terminal electrode sheet 33B are prepared.

[0078] The electrode sheet 31B has a bipolar electrode 11, a sealing frame member 23, and a separator 12. The sealing frame member 23 is welded to the periphery R110 of the first main surface S110A of the current collector 110 of the bipolar electrode 11. The separator 12 is welded to the sealing frame member 23. The positive electrode layer side terminal electrode sheet 32B has a positive electrode layer side terminal electrode 13 and a sealing frame member 23. The sealing frame member 23 is welded to the periphery R110 of the current collector 110 of the positive electrode layer side terminal electrode 13. The negative electrode layer side terminal electrode sheet 33B has a negative electrode layer side terminal electrode 14 and a sealing frame member 23. The sealing frame member 23 is welded to the periphery R110 of the current collector 110 of the negative electrode layer side terminal electrode 14. The preparation method for each of the electrode sheet 31B, the positive electrode layer side terminal electrode sheet 32B, and the negative electrode layer side terminal electrode sheet 33B may be a known method.

[0079] (2.2.2) Laminating and welding process In the laminating and welding process, the laminating operation is repeatedly performed to form the electrode laminate 10 and the sealing frame 20B. The laminating operation refers to the operation of laminating the electrode sheet 31B on the electrode sheet 31B, heating the periphery R23 of the sealing frame member 23 of the laminated electrode sheet 31B from the Z-axis direction, and welding it to the electrode sheet 31B.

[0080] Specifically, as shown in FIG. 8, the electrode sheet 31B is laminated on the negative electrode layer side terminal electrode sheet 33B. Next, the periphery R23 of the sealing frame member 23 of the laminated electrode sheet 31B is heated from the Z-axis direction by the heating device 40 and welded to the negative electrode layer side terminal electrode sheet 33B. Thereby, the negative electrode layer side terminal electrode sheet 33B and the electrode sheet 31B are integrated to obtain a laminated integrated body 304. Next, the electrode sheet 31B is laminated on the electrode sheet 31B of the laminated integrated body 304. Next, the periphery R23 of the sealing frame member 23 of the laminated electrode sheet 31B is heated from the Z-axis direction by the heating device 40 and welded to the sealing frame member 23 of the laminated integrated body 304. Thereby, the laminated integrated body 304 and the electrode sheet 31B are integrated to obtain a laminated integrated body 305. Such a laminating operation is repeatedly performed. Finally, the positive electrode layer side terminal electrode sheet 32B is laminated on the electrode sheet 31B of the laminated integrated body. Next, the periphery R23 of the sealing frame member 23 of the laminated positive electrode layer side terminal electrode sheet 32B is heated from the Z-axis direction by the heating device 40 and welded to the sealing frame member 23 of the laminated integrated body. Thereby, the laminated integrated body and the positive electrode layer side terminal electrode sheet 32B are integrated to form the electrode laminate 10 and the sealing frame 20B. In other words, a second battery precursor is obtained. The second battery precursor has the same configuration as the battery 1B except that the non-aqueous electrolyte is not accommodated in the accommodation portion T.

[0081] Examples of the heating method of the heating device 40 include the same ones as those exemplified as the heating method of the heating device 40 in the first embodiment. From the viewpoint of accurately controlling the welding length L6, the heating method of the heating device 40 is preferably laser heating.

[0082] (2.2.3) Pressure reduction step In the pressure reduction step, the pressure in the accommodation portion T of the second battery precursor is reduced. As a result, the air in the accommodation portion T is discharged to the outside of the second battery precursor. As a result, the non-aqueous electrolyte is easily injected into the accommodation portion T. Any known method may be used to reduce the pressure in the accommodation portion T.

[0083] (2.2.4) Liquid injection step In the liquid injection step, a non-aqueous electrolyte is injected into the accommodation portion T of the second battery precursor. Thereby, the battery 1B is obtained. Any known method may be used for injecting the non-aqueous electrolyte.

[0084] (2.3) Operational effects As described with reference to FIGS. 5 to 8, the battery 1B includes an electrode laminate 10, a sealing frame 20B, and a non-aqueous electrolyte. The bipolar electrode 11 has a current collector 110, a positive electrode layer 111, and a negative electrode layer 112. The sealing frame 20B has a sealing frame member 23. The sealing frame member 23 has an extending portion 230. The extending portion 230 is in direct contact with an adjacent sealing frame member 23. As a result, it is difficult to form a gap at the interface between two adjacent sealing frame members 23 of the sealing frame member 23. Therefore, when the sealing frame member 23 is welded, the shape of the sealing frame member 23 is difficult to deform. As a result, the side surface of the battery 1B constituted by the sealing frame 20B becomes a vertical surface. As a result, the battery 1B has excellent structural efficiency.

[0085] As described with reference to FIGS. 5 to 8, in a cross section cut along a direction parallel to the Z-axis direction, in a direction orthogonal to the Z-axis direction, the welding length L6 (see FIG. 7) is shorter than the length L7 (see FIG. 7) from the side surface S20B of the sealing frame 20B to the current collector 110. As a result, compared with the case where all regions of the interface between two adjacent sealing frame members 23 of the sealing frame member 23 are welded, stress due to volume change is less likely to be locally applied to the sealing frame 20B. As a result, even when a thermal cycle test is performed on the battery 1B, cracks are less likely to occur in the sealing frame 20B. That is, the battery 1B has excellent sealing performance

[0086] As described with reference to FIGS. 5 to 8, the thickness L8 (see FIG. 7) in the Z-axis direction from the welding surface S23 of the protruding portion 231 is not less than 1 time and not more than 2 times the thickness of the current collector 110. As a result, in the battery 1B, the adhesion between two adjacent sealing frame members 23 is better than that in a configuration where the thickness L8 is outside the range of not less than 1 time and not more than 2 times the thickness of the current collector 110.

[0087] As described with reference to FIGS. 5 to 8, the manufacturing method of the battery according to the second embodiment is a method for manufacturing the battery 1B. The manufacturing method includes a preparation step and a laminated welding step. The lamination operation refers to an operation of laminating the electrode sheet 31B on the electrode sheet 31B, heating the peripheral edge R23 of the sealing frame member 23 of the laminated electrode sheet 31B from the Y-axis direction, and welding it to the electrode sheet 31B. As a result, the manufacturing method of the second embodiment can manufacture the battery 1B having excellent structural efficiency. Further, in the manufacturing method of the second embodiment, by performing heating and welding from the stacking direction (Z-axis direction), it becomes easier to control the welding length L6. Therefore, it is not necessary to design the welding length L6 to be long in order to ensure the sealing property, and the structural efficiency of the battery 1B is improved. As a result, the manufacturing method of the second embodiment can manufacture the battery 1B having excellent structural efficiency and excellent sealing property.

[0088] (3) Modification In the first embodiment, the welding length L3 (see FIG. 3) is shorter than the length L4 (see FIG. 3), but the present disclosure is not limited thereto. In the present disclosure, the welding length L3 may be the same as the length L4 or may be longer than the length L4.

[0089] In the first embodiment, the height L5 (see FIG. 3) is 0.25 times or more and 1 time or less the thickness of the current collector 110, but the present disclosure is not limited thereto. In the present disclosure, the height L5 may be outside the range of 0.25 times or more and 1 time or less the thickness of the current collector 110.

[0090] In the second embodiment, the welding length L6 (see FIG. 7) is shorter than the length L7 (see FIG. 7), but the present disclosure is not limited thereto. In the present disclosure, the welding length L6 may be the same as the length L7 or may be longer than the length L7.

[0091] In the second embodiment, the thickness L8 (see FIG. 7) of the sealing frame member 23 in the Y-axis direction is 1 time or more and 2 times or less the thickness of the current collector 110, but the present disclosure is not limited thereto. In the present disclosure, L8 may be outside the range of 1 time or more and 2 times or less the thickness of the current collector 110.

[0092] In the first and second embodiments, the electrode laminate 10 includes a plurality of bipolar electrodes 11, but the present disclosure is not limited thereto. In the present disclosure, the electrode laminate 10 may include monopolar electrodes instead of the plurality of bipolar electrodes 11. As shown in FIG. 3, the monopolar electrode has a positive electrode and a negative electrode. The positive electrode includes a current collector 110 and a positive electrode layer 111 formed on the first main surface S110A and the second main surface S110B of the current collector 110. The negative electrode includes a current collector 110 and a negative electrode layer 112 formed on the first main surface S110A and the second main surface S110B of the current collector 110.

Explanation of Signs

[0093] 1A: Battery, 1B: Battery, 10: Electrode laminate, 11: Bipolar electrode, 12: Separator, 13: Positive electrode layer side terminal electrode, 14: Negative electrode layer side terminal electrode, 20A: Sealing frame, 20B: Sealing frame, 21: Sealing frame member, 22: Spacer, 23: Sealing frame member, 31A: Electrode sheet, 31B: Electrode sheet, 32A: Positive electrode layer side terminal electrode sheet, 32B: Positive electrode layer side terminal electrode sheet, 33A: Negative electrode layer side terminal electrode sheet, 33B: Negative electrode layer side terminal electrode sheet, 40: Heating device, 110: Current collector, 111: Positive electrode layer, 112: Negative electrode layer, 301: Laminated integrated body, 302: Laminated integrated body, 303: Laminated integrated body, 304: Laminated integrated body, 305: Laminated integrated body, R21: Periphery, R22: Periphery, R23: Periphery, R110: Periphery, S21A1: Planar part, S21A2: Concave part, S21B1: Planar part, S21B2: Concave part, S22A1: Planar part, S22A2: Convex part, S22B1: Planar part, S22B2: Convex part

Claims

1. An electrode laminate including a plurality of electrodes laminated in a stacking direction via a separator; A sealing frame that seals a side circumferential surface of the electrode laminate and forms an accommodation portion between adjacent electrodes among the plurality of electrodes; A non-aqueous electrolyte accommodated in the accommodation portion; Comprising: The electrode has a current collector and at least one of a positive electrode layer and a negative electrode layer, and The electrode has an uncoated portion on one surface and the other surface of the current collector where the positive electrode layer and the negative electrode layer are not formed, The sealing frame has a sealing frame member welded to at least a part of the uncoated portion on at least one of one surface and the other surface of the current collector of each of the plurality of electrodes, A battery satisfying the following (A) or (B). (A): The sealing frame further includes a spacer disposed between two adjacent sealing frame members among the plurality of sealing frame members, The spacer has a first planar portion and a convex portion protruding in the stacking direction from the first planar portion at a portion in contact with each of the two adjacent sealing frame members, The sealing frame member has a second planar portion in contact with the first planar portion and a concave portion recessed in the stacking direction from the second planar portion at a portion in contact with each of the two adjacent spacers, The convex portion is fitted into the concave portion (B): The sealing frame member is welded to at least a part of the uncoated portion on one of one surface and the other surface of the current collector, The sealing frame member has an extending portion extending in a plane direction of the current collector orthogonal to the stacking direction from the current collector, The extending portion is in direct contact with an adjacent sealing frame member

2. When satisfying (A), in a cross section cut along the stacking direction, in a direction orthogonal to the stacking direction, the length from the side surface of the sealing frame of the portion where the interface between the spacer and the sealing frame member is welded is shorter than the length from the side surface of the sealing frame to the current collector, When satisfying (B), in a cross section cut along the stacking direction, in a direction orthogonal to the stacking direction, the length from the side surface of the sealing frame of the portion where the interface between adjacent sealing frame members is welded is shorter than the length from the side surface of the sealing frame to the current collector. The battery according to Claim 1.

3. Satisfying (A), The battery according to claim 1 or claim 2, wherein the height of the convex portion in the stacking direction from the first planar portion of the spacer is 0.25 times or more and 1 time or less the thickness of the current collector.

4. satisfying the above (B), the sealing frame member has a protruding portion protruding from the welding surface with the current collector in the extending portion, The battery according to claim 1 or claim 2, wherein the thickness of the protruding portion in the stacking direction from the welding surface is 1 time or more and 2 times or less the thickness of the current collector.

5. A method for manufacturing the battery according to claim 1, which satisfies the above (A), comprising: preparing an electrode sheet including the electrode, the sealing frame member, and the separator welded to the sealing frame member, and the spacer; repeatedly performing a stacking operation to form the electrode laminate and the sealing frame; having The stacking operation is stacking the spacer on the electrode sheet, heating the periphery of the stacked spacer in the stacking direction, and welding it to the electrode sheet; A method for manufacturing a battery, which includes stacking the electrode sheet on the spacer, heating the periphery of the sealing frame member of the stacked electrode sheet in the stacking direction, and welding it to the spacer.

6. A method for manufacturing the battery according to claim 1, which satisfies the above (B), comprising: preparing an electrode sheet including the electrode, the sealing frame member, and the separator welded to the sealing frame member; repeatedly performing a stacking operation to form the electrode laminate and the sealing frame; having The stacking operation is an operation of stacking the electrode sheet on the electrode sheet, heating the periphery of the sealing frame member of the stacked electrode sheet in the stacking direction, and welding it to the electrode sheet.

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