Battery and method for manufacturing battery

Abstract

A battery and a method for manufacturing the battery are provided. A battery according to the present disclosure is provided with an electrode laminate including a plurality of electrodes, a sealing frame, and a non-aqueous electrolyte solution. The electrode has a current collector and at least one of a positive electrode layer and a negative electrode layer. The electrode has an uncoated portion. The sealing frame has a sealing frame member that is welded to at least a portion of the uncoated portion of at least one of the one surface and the other surface of the current collector of each of the plurality of electrodes. The battery satisfies the following (A) or (B). (A) The seal frame is further provided with a spacer having a convex portion, the seal frame member has a concave portion, and the convex portion fits into the concave portion. (B) The sealing frame member is welded to at least a portion of the uncoated portion of one of the one surface and the other surface of the current collector, and the sealing frame member has an extended portion that is directly in contact with an adjacent sealing frame member.

Description

Technical Field

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

[0002] Japanese Patent Gazette No. 2023-59 (Patent Document 1) discloses a method for manufacturing a power storage device (hereinafter also referred to as a "battery"). The manufacturing method includes a preparation process, a melting process, and a specific molding process. In the preparation process, a stack is prepared. The stack includes a plurality of current collectors provided with active material layers, and a plurality of sealing members. The sealing member is in the shape of a frame surrounding the active material layer when observed from the thickness direction of the current collector, and has an extension portion extending outward from the outer edge of the current collector. The sealing member is arranged between each of the plurality of current collectors. In the welding process, the plurality of sealing members are melted by non-contact heating, thereby forming a side surface composed of the plurality of sealing members and including a connecting port connecting the inside and outside of the stack.

[0003] Specifically, in the preparation process, Fig. 9 The stack 900 shown. The stack 900 includes a plurality of electrode units 910, a plurality of separators 920, and a plurality of spacers 930. The electrode units 910, the separators 920, and the spacers 930 are stacked in this order along the stacking direction D1. The electrode unit 910 includes a bipolar electrode 911 and a sealing member 912. The bipolar electrode 911 includes 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 side S9111A of the current collector 9111. The negative electrode active material layer 9113 is provided on the other side S9111B of the current collector 9111. The sealing member 912 is bonded to one side S9111A and the other side S9111B of the current collector 9111 at the peripheral portion 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, Fig. 9 As shown, infrared heater 800 is used to irradiate infrared rays to the side surface S900 of stacked body 900, and the interface between sealing member 912 and spacer 930 is welded and integrated. Thus, sealing portion 940 is formed. Then, a specific molding process is performed. Thus, Fig.10 Battery 901 is shown. Summary of the invention

[0005] Problems to be solved by the invention

[0006] In the case where all areas of the interface between the sealing member 912 and the spacer 930 are welded, when the battery 901 is subjected to a hot and cold cycle test, a crack may occur in the sealing portion 940 due to the volume change of the sealing portion 940. The "hot and cold cycle test" refers to a test in which the battery 901 is alternately exposed to a high temperature atmosphere and a low temperature atmosphere for multiple times. When a crack occurs in the sealing portion 940, the non-aqueous electrolyte may leak out. In other words, the sealing of the battery 901 may be insufficient.

[0007] The inventors have confirmed through experiments that, in the direction D2 orthogonal to the stacking direction D1, making the length of the fusion region of the sealing member 912 (for example, the region where the interface of the sealing member 912 and the spacer 930 is fused) shorter than the length L901 between the side surface S901 of the battery 901 and the end surface of the collector 9111 is effective in suppressing the occurrence of cracks in the sealing portion 940. This is believed to be because, compared to the case where all regions of the interface between the sealing member 912 and the spacer 930 are fused, the stress caused by the volume change is not easily applied locally to the sealing portion 940.

[0008] On the other hand, in the laminate 900, the current collector 9111 does not exist at the periphery of the electrode unit 910. Therefore, the thickness of the periphery of the electrode unit 910 is thinner than the thickness of the central portion of the electrode unit 910. Fig. 9 As shown, a gap G is formed at the periphery of the stack 900. Thus, when the welding process is performed, the melt of the sealing member 912 or the spacer 930 flows into the gap G, and the shape of the periphery of the stack 900 may be deformed. In other words, the side of the battery 901 formed by the sealing portion 940 may become an inclined surface. Therefore, in the stack 900, in order to form a battery 901 with excellent sealing (in order to suppress the occurrence of rupture of the sealing portion 940), it is difficult to control the welding length.

[0009] On the other hand, in order to form a battery 901 with excellent sealing properties, it is conceivable to increase the length L901 (see Fig.10 ) is designed to be long. However, the sealing member 912 and the spacer 930 do not directly contribute to the battery reaction. Therefore, the length L901 (refer to Fig.10 ) is designed to be long, which 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 that performs the battery reaction to the overall volume of the battery.

[0010] Therefore, a battery having excellent structural efficiency is required. Furthermore, a battery manufacturing method capable of manufacturing a battery having excellent structural efficiency is required.

[0011] The present disclosure is completed in view of the above-mentioned actual situation. The problem to be solved by one embodiment of the present disclosure is to provide a battery with excellent structural efficiency. The problem to be solved by other embodiments of the present disclosure is to provide a method for manufacturing a battery capable of manufacturing a battery with excellent structural efficiency and excellent sealing.

[0012] Means for solving problems

[0013] Means for solving the above-mentioned problems include the following embodiments.

[0014] <1> The battery of Option 1 has:

[0015] An electrode stack including a plurality of electrodes stacked in a stacking direction with separators interposed therebetween;

[0016] a sealing frame that seals the side circumference of the electrode stack and forms a receiving portion between adjacent electrodes among the plurality of electrodes; and

[0017] A non-aqueous electrolyte is contained in the containing portion.

[0018] The electrode comprises at least one of a positive electrode layer and a negative electrode layer and a current collector, and

[0019] 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.

[0020] The sealing frame includes a sealing frame member, and the sealing frame member is 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.

[0021] The battery satisfies the following (A) or (B),

[0022] (A): The sealing frame further includes a spacer, and the spacer is arranged between two adjacent sealing frame members among the plurality of sealing frame members.

[0023] The spacer has a first planar portion and a convex portion protruding from the first planar portion in the stacking direction at a portion contacting each of the two adjacent sealing frame members.

[0024] 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 contacting each of the two adjacent spacers.

[0025] The convex portion is fitted into the concave portion,

[0026] (B) the sealing frame member is welded to at least a portion of the uncoated portion of one of the one surface and the other surface of the current collector,

[0027] The sealing frame member has an extension portion extending from the current collector in a surface direction of the current collector orthogonal to the stacking direction.

[0028] The extended portion is directly connected to the adjacent sealing frame member.

[0029] The battery according to the first aspect satisfies (A) or (B).

[0030] When the battery of the first scheme satisfies (A), the convex portion of the spacer is fitted into the concave portion of the sealing frame member. In other words, it is not easy to form a gap at the interface between the spacer and the sealing frame member. Therefore, when the sealing frame member is welded, the shape of the sealing frame member is not easily deformed. As a result, the side surface of the battery formed by the sealing frame becomes a vertical surface. As a result, the battery of the first scheme has excellent structural efficiency.

[0031] When the battery of the first scheme satisfies (B), the extended portion is directly connected to the adjacent sealing frame member. In other words, it is not easy to form a gap at the interface of two adjacent sealing frame members of the sealing frame member. Therefore, when the sealing frame member is welded, the shape of the sealing frame member is not easily deformed. As a result, the side surface of the battery formed by the sealing frame becomes a vertical surface. As a result, the battery of the first scheme has excellent structural efficiency.

[0032] <2> The battery of the second embodiment is based on the above <1> The battery,

[0033] When the condition (A) is satisfied, in a cross section cut along a direction parallel to the stacking direction, the length of the portion where the interface between the spacer and the sealing frame member is welded from the side surface of the sealing frame in a direction orthogonal to the stacking direction is shorter than the length from the side surface of the sealing frame to the collector,

[0034] When condition (B) is satisfied, in a cross section obtained by cutting along a direction parallel to the stacking direction, in a direction orthogonal to the stacking direction, the length of the interface welded portion of adjacent sealing frame members from the side of the sealing frame is shorter than the length from the side of the sealing frame to the collector.

[0035] In the second embodiment, when (A) is satisfied, the stress caused by the volume change is not easily applied locally to the sealing portion, compared to the case where all areas of the interface between the sealing frame member and the spacer are welded. As a result, even if the battery of the second embodiment is subjected to a hot and cold cycle test, it is not easy to cause cracks in the sealing frame. In other words, the battery of the second embodiment has excellent sealing performance.

[0036] In the second embodiment, when (B) is satisfied, compared with the case where all areas of the interface of two adjacent sealing frame members of the sealing frame member are welded, the stress caused by the volume change is not easily applied locally to the sealing portion. As a result, even if the battery of the second embodiment is subjected to a hot and cold cycle test, it is not easy to cause cracks in the sealing frame. In other words, the battery of the second embodiment has excellent sealing performance.

[0037] <3> The battery of the third aspect of the present disclosure is based on the above <1> or <2> The battery,

[0038] The battery satisfies (A),

[0039] A height of the convex portion of the spacer from the first planar portion in the stacking direction is not less than 0.25 times and not more than 1 times the thickness of the current collector.

[0040] Therefore, in the battery of the third scheme, compared with the structure in which the height of the convex portion of the spacer in the stacking direction from the first plane portion is outside the range of more than 0.25 times and less than 1 times the thickness of the collector, the adhesion (close fitting, tight contact) between the spacer and the sealing frame member is excellent.

[0041] <4> The battery of the fourth aspect of the present disclosure is according to the above <1> or <2> The battery,

[0042] The battery satisfies (B),

[0043] The sealing frame member has a protrusion on the extension portion that protrudes from a welding surface welded to the collector.

[0044] The thickness of the protrusion in the stacking direction from the welded surface is not less than 1 time and not more than 2 times the thickness of the current collector.

[0045] Therefore, in the battery of the fourth aspect, the adhesion between two adjacent sealing frame members is excellent compared to a configuration in which the thickness of the protrusion in the stacking direction from the welded surface is not less than 1 times and not more than 2 times the thickness of the collector.

[0046] <5> The method for manufacturing a battery according to the fifth aspect of the present disclosure is to manufacture a battery satisfying the above (A) <1> ~ <3> The battery method described in any one of the above,

[0047] The manufacturing method of the battery comprises:

[0048] preparing an electrode sheet and the separator, the electrode sheet including the electrode, the sealing frame member, and the separator welded to the sealing frame member; and

[0049] Repeating the lamination operation to form the electrode stack and the sealing frame,

[0050] The cascade operation represents the following operation:

[0051] The separator is stacked on the electrode sheet, and the periphery of the stacked separator is heated from the stacking direction to be welded to the electrode sheet.

[0052] The electrode sheets are stacked on the separator, and the peripheral edges of the sealing frame member of the stacked electrode sheets are heated from the stacking direction to be welded to the separator.

[0053] The manufacturing method of the fifth embodiment includes: repeatedly performing a stacking operation to form an electrode stack and a sealing frame. Thus, the manufacturing method of the fifth embodiment can manufacture a battery that satisfies the above-mentioned (A). Here, the manufacturing method of the fifth embodiment is a method of performing the following operations: heating the periphery of the stacked spacers from the stacking direction to fuse them to the electrode sheets, and then further stacking the electrode sheets, and heating the periphery of the sealing frame components of the stacked electrode sheets from the stacking direction to fuse them to the spacers. By performing the welding by heating from the stacking direction, it is easy to control the length of the welded portion. Therefore, there is no need to increase the weld length (for example, Fig.10 The length L901) in the middle is designed to be long, and the structural efficiency of the battery is improved.

[0054] As a result, the manufacturing method of the fifth aspect can manufacture a battery having excellent structural efficiency and excellent sealing properties.

[0055] <6> The method for manufacturing a battery according to the sixth aspect of the present disclosure is to manufacture a battery that satisfies the above (B) <1> , <2> as well as <4> The battery method according to any one of the preceding claims,

[0056] The manufacturing method of the battery comprises:

[0057] preparing an electrode sheet including the electrode, the sealing frame member, and the separator welded to the sealing frame member; and

[0058] Repeating the lamination operation to form the electrode stack and the sealing frame,

[0059] The stacking operation refers to an operation of stacking the electrode sheet on the electrode sheet and heating the peripheral edge of the sealing frame member of the stacked electrode sheet from the stacking direction to be welded to the electrode sheet.

[0060] Moreover, the manufacturing method of the sixth embodiment includes: repeatedly performing a stacking operation to form an electrode stack and a sealing frame. Thus, the manufacturing method of the sixth embodiment can manufacture a battery that satisfies the above-mentioned (B). Here, the manufacturing method of the sixth embodiment is a method of performing the following operation: heating the periphery of the sealing frame component of the stacked electrode sheets from the stacking direction to fuse them to the electrode sheets. By heating from the stacking direction to perform welding, it is easy to control the length of the welded portion. Therefore, there is no need to increase the weld length (for example, Fig.10 The length L901) in the middle is designed to be long, and the structural efficiency of the battery is improved.

[0061] As a result, the manufacturing method of the sixth aspect can manufacture a battery having excellent structural efficiency and excellent sealing properties.

[0062] Effects of the Invention

[0063] According to one 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 performance is provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 This is a perspective view of the appearance of the battery according to the first embodiment of the present disclosure.

[0065] Figure 2 yes Figure 1 Sectional view along line II-II.

[0066] Figure 3 yes Figure 2 A partial enlarged view of .

[0067] Figure 4 It is a cross-sectional view for explaining the method for manufacturing the battery according to the first embodiment of the present disclosure.

[0068] Figure 5 This is a perspective view of the appearance of a battery according to a second embodiment of the present disclosure.

[0069] Figure 6 yes Figure 5 VI-VI line section view.

[0070] Figure 7 yes Figure 6 A partial enlarged view of .

[0071] Figure 8 It is a cross-sectional view for explaining the method for manufacturing a battery according to the second embodiment of the present disclosure.

[0072] Fig. 9 This is a cross-sectional view of a laminated body which is a precursor of a conventional battery.

[0073] Fig.10 This is a cross-sectional view of a conventional battery.

[0074] Description of Reference Numerals

[0075] 1A: Battery, 1B: Battery, 10: Electrode stack, 11: Bipolar electrode, 12: Separator, 13: Positive electrode layer end electrode, 14: Negative electrode layer end electrode, 20A: Sealing frame, 20B: Sealing frame, 21: Sealing frame member, 22: Separator, 23: Sealing frame member, 31A: Electrode sheet, 31B: Electrode sheet, 32A: Positive electrode layer end electrode sheet, 32B: Positive electrode layer end electrode sheet, 33A: Negative electrode layer end electrode sheet, 33B: Negative electrode layer end electrode sheet, 40: Heating device, 110: Current collector , 111: positive electrode layer, 112: negative electrode layer, 301: laminated integrated product, 302: laminated integrated product, 303: laminated integrated product, 304: laminated integrated product, 305: laminated integrated product, R21: periphery, R22: periphery, R23: periphery, R110: periphery, S21A1: plane portion, S21A2: concave portion, S21B1: plane portion, S21B2: concave portion, S22A1: plane portion, S22A2: convex portion, S22B1: plane portion, S22B2: convex portion. DETAILED DESCRIPTION

[0076] In the present disclosure, the numerical range represented by "to" means the following range: the numerical values ​​recorded before and after the "to" are included as the minimum and maximum values, respectively. In the numerical range recorded in stages in the present disclosure, the upper limit or lower limit recorded in a certain numerical range can also be replaced by the upper limit or lower limit of other numerical ranges recorded in stages. In the present disclosure, a combination of two or more preferred schemes is a more preferred scheme. In the present disclosure, the term "process" does not only include independent processes, even if it cannot be clearly distinguished from other processes, as long as the desired purpose of the process can be achieved, it is also included in this term.

[0077] Hereinafter, embodiments of the battery and the method for manufacturing the battery disclosed herein will be described with reference to the accompanying drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals, and their description will not be repeated.

[0078] (1) First Embodiment

[0079] (1.1) Battery

[0080] like Figure 1 As shown in FIG. 1 , the battery 1A of the first embodiment is a rectangular parallelepiped. The battery 1A includes an electrode stack 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 stack 10 .

[0081] In the embodiment, the long side 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. The X-axis, the Y-axis, and the Z-axis are respectively orthogonal to each other. The Z-axis direction is an example of a stacking direction. The negative direction of the Z-axis is parallel to the gravity direction. In addition, these directions do not limit the directions of the battery of the present disclosure when in use.

[0082] The length L1 of the battery 1A in the X-axis direction (see Figure 1 ) and the length L2 in the Y-axis direction (refer to Figure 1 ) can each exceed 1m.

[0083] (1.1.1) Electrode stack

[0084] The electrode stack 10 is a rectangular parallelepiped. The electrode stack 10 includes a plurality of bipolar electrodes 11 stacked in the Z-axis direction with separators 12 interposed therebetween. Figure 2 As shown, the electrode stack 10 includes 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 stacked along the axial direction. The positive electrode layer side terminal electrode 13 is stacked on the bipolar electrode 11 located closest to one side of the stacking direction (the positive side in the Z-axis direction) among the plurality of bipolar electrodes 11 through the separator 12. The negative electrode layer side terminal electrode 14 is stacked on the bipolar electrode 11 located closest to the other side of the stacking direction (the negative side in the Z-axis direction) among the plurality of bipolar electrodes 11 through the separator 12.

[0085] (1.1.1.1) Bipolar Electrode

[0086] like Figure 3 As shown, the bipolar electrode 11 has a current collector 110, a positive electrode layer 111, and a negative electrode layer 112. The positive electrode layer 111 is formed on the second main surface S110B of the current collector 110. The negative electrode layer 112 is formed on the first main surface S110A of the current collector 110. The bipolar electrode 11 has an uncoated portion R10 on the first main 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 in the uncoated portion R10. The uncoated portion R10 includes the periphery R110 of the current collector 110 (see Figure 3 ). The bipolar electrode 11 may have a known structure. 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.

[0087] The collector 110 supplies current to the positive electrode layer 111 and the negative electrode layer 112 during the discharge or charge of the battery 1A. As the material of the collector 110, metal foil, conductive resin material or conductive inorganic material can be listed. As metal foil, for example, aluminum foil, copper foil, nickel foil, titanium foil, stainless steel foil, etc. can be listed. As conductive resin material, for example, resin obtained by adding conductive fillers to conductive polymer materials or non-conductive polymer materials as needed can be listed. A coating layer can be formed on the surface of the collector 110. The coating layer can be formed by a known method (for example, plating treatment, spraying, etc.). The thickness of the collector 110 can be 1μm to 100μm.

[0088] The positive electrode layer 111 includes a positive electrode layer active material that can absorb and release charge carriers (e.g., a lithium composite metal oxide with a layered rock salt structure, a metal oxide with a spinel structure, a polyanion compound, etc.). The thickness (length in the Z-axis direction) of the positive electrode layer 111 can be 2 μm to 500 μm.

[0089] The negative electrode layer 112 includes a negative electrode layer active material that can absorb and release charge carriers (for example, a compound that can be alloyed with carbon, lithium, etc.). As carbon, for example, natural graphite, artificial graphite, hard carbon (difficult to graphitize carbon) or soft carbon (easy to graphitize carbon) can be listed. As artificial graphite, for example, highly oriented graphite, intermediate phase carbon microbeads can be listed. As elements that can be alloyed with lithium, silicon or tin can be listed. The thickness of the negative electrode layer 112 (the length in the Z-axis direction) can be 2μm to 500μm. The thickness of the negative electrode layer 112 can be the same as or different from the thickness of the positive electrode layer 111.

[0090] The positive electrode layer 111 and the negative electrode layer 112 may each further include a conductive aid for improving electronic conductivity, a binder, an electrolyte supporting salt (lithium salt) for improving ion conductivity, a polymer electrolyte, an additive (for example, trifluoropropylene carbonate, a filler as a reinforcing material, etc.) as needed. As a conductive aid, for example, carbon nanofibers, acetylene black, carbon black or graphite can be listed. As a binder, for example, fluorine-containing resins (polyvinylidene fluoride, polytetrafluoroethylene, fluororubber, etc.), thermoplastic resins (for example, polypropylene, polyethylene, etc.), imide resins (for example, polyimide, polyamideimide, etc.), alkoxysilyl-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 crosslinked bodies, starch-acrylic acid graft polymers, etc. can be listed. These binders (adhesives) can be used alone or in combination.

[0091] (1.1.1.2) Separator

[0092] The separator 12 maintains the spacing between the positive electrode layer 111 and the negative electrode layer 112 to prevent the occurrence of contact short circuits, 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. As the separator 12, for example, a porous resin sheet or a non-woven fabric can be listed. As the material of the porous resin sheet, for example, polyolefins (polypropylene, polyethylene, etc.) or polyester can be listed. As the material of the non-woven fabric, for example, polypropylene, polyethylene terephthalate or methyl cellulose can be listed. The separator 12 can be a known structure.

[0093] (1.1.1.3) Positive electrode side terminal electrode

[0094] The positive electrode layer side terminal electrode 13 includes 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 structure.

[0095] (1.1.1.4) Negative electrode side terminal electrode

[0096] The negative electrode layer side terminal electrode 14 includes 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 structure.

[0097] (1.1.2) Sealing frame

[0098] The sealing frame 20A forms a housing 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 contained in the housing portion T in a state of being contained in the non-aqueous electrolyte. The sealing frame 20A prevents the non-aqueous electrolyte contained in the housing portion T from leaking to the outside. The sealing frame 20A can prevent moisture from entering the housing portion T from the outside of the battery 1A.

[0099] The sealing frame 20A is a square tube-shaped object 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.

[0100] In the first embodiment, a portion 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. Figure 3As shown, in the direction orthogonal to the Z-axis direction, the length L3 (hereinafter also referred to as "welding length L3") from the side S20A of the sealing frame 20A at the interface where the spacer 22 and the sealing frame member 21 are welded is shorter than the length L4 from the side S20A of the sealing frame 20A to the collector 110.

[0101] (1.1.2.1) Sealing frame components

[0102] The sealing frame member 21 is a square tube-shaped object with a rectangular cross section. In the first embodiment, 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 each of the plurality of bipolar electrodes 11 .

[0103] The sealing frame member 21 has a flat portion S21A1 and a concave portion S21A2 on a first surface S21A in contact with the spacer 22 disposed on the positive side of the Z axis. The flat portion S21A1 contacts the flat portion S22B1 of the spacer 22. The concave portion S21A2 is recessed from the flat portion S21A1 in the negative direction of the Z axis.

[0104] The sealing frame member 21 has a flat portion S21B1 and a concave portion S21B2 on the second surface S21B in contact with the spacer 22 disposed on the negative side of the Z axis. The flat portion S21B1 contacts the flat portion S22A1 of the spacer 22. The concave portion S21B2 is recessed from the flat portion S21B1 toward the positive direction of the Z axis.

[0105] Examples of the material of the sealing frame member 21 include polyethylene, polystyrene, acrylonitrile-butadiene-styrene copolymer resin (ABS resin), modified polypropylene, and acrylonitrile-styrene resin.

[0106] (1.1.2.2) Spacers

[0107] The spacer 22 is a square tube-shaped object with a rectangular cross section.

[0108] The spacer 22 has a planar portion S22A1 and a convex portion S22A2 on a first surface S22A that contacts the sealing frame member 21 disposed on the positive Z-axis direction side. The convex portion S22A2 protrudes from the planar portion S22A1 in the positive Z-axis direction.

[0109] The spacer 22 has a flat portion S22B1 and a convex portion S22B2 on the second surface S22B in contact with the sealing frame member 21 disposed on the negative side in the Z axis direction. The convex portion S22B2 protrudes from the flat portion S22B1 in the negative direction in the Z axis.

[0110] 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.

[0111] In the first embodiment, the height L5 of the convex portion S22A2 of the spacer 22 in the Z-axis direction from the plane portion S22A1 is 0.25 times or more and 1 times or less of the thickness of the current collector 110 (i.e., the length of the current collector 110 in the Z-axis direction). In the first embodiment, the height L5 of the convex portion S22B2 of the spacer 22 in the Z-axis direction from the plane portion S22B1 is 0.25 times or more and 1 times or less of the thickness of the current collector 110.

[0112] Examples of the material of the spacer 22 include polyethylene, polystyrene, acrylonitrile-butadiene-styrene copolymer resin (ABS resin), modified polypropylene, acrylonitrile-styrene resin, etc. The material of the spacer 22 may be the same as or different from that of the sealing frame member 21 .

[0113] (1.1.3) Non-aqueous electrolyte

[0114] The non-aqueous electrolyte is contained in the containing part T. The non-aqueous electrolyte may include a non-aqueous solvent and a lithium salt. As the lithium salt, for example, LiClO4, LiAsF6, LiPF6, LiBF4, LiCF3SO3, LiN(FSO2)2, LiN(CF3SO2)2, etc. may be listed. As the non-aqueous solvent, cyclic carbonates, cyclic esters, chain carbonates, chain esters, ethers, etc. may be listed. The non-aqueous electrolyte may also include additives (for example, lithium bis(oxalatoborate), etc.).

[0115] (1.1.4) Purpose

[0116] The battery 1A can be used as a power source for electric four-wheeled vehicles, electric two-wheeled vehicles, portable devices, power storage systems, etc. Examples of electric four-wheeled vehicles include battery electric vehicles (BEV), plug-in hybrid electric vehicles (PHEV), and hybrid electric vehicles (HEV).

[0117] Electric two-wheeled vehicles include electric bicycles or electric power-assisted bicycles. Portable devices include, for example, smart phones, tablet computers, laptop computers, power tools, and cameras. Power storage systems include household power storage systems, industrial power storage systems, and power storage systems (ESS: Energy Storage System).

[0118] (1.2) Manufacturing method

[0119] The method for manufacturing the battery of the first embodiment includes a preparation step, a lamination welding step, a decompression step, and a liquid injection step. The preparation step, the lamination welding step, the decompression step, and the liquid injection step are performed in this order. Thus, the battery 1A is obtained.

[0120] (1.2.1) Preparation process

[0121] In the preparation step, a plurality of electrode tabs 31A, a plurality of separators 22 , a positive electrode layer terminal electrode tab 32A, and a negative electrode layer terminal electrode tab 33A are prepared.

[0122] The electrode sheet 31A includes the bipolar electrode 11 , the sealing frame member 21 , and the 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 .

[0123] The positive electrode layer side terminal electrode sheet 32A includes the 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.

[0124] The negative electrode layer end electrode sheet 33A includes the negative electrode layer end 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 end electrode 14.

[0125] The electrode tab 31A, the positive electrode layer-end electrode tab 32A, the negative electrode layer-end electrode tab 33A, and the separator 22 may be prepared by any known method.

[0126] (1.2.2) Lamination welding process

[0127] In the lamination and welding process, the lamination operation is repeatedly performed to form the electrode laminate 10 and the sealing frame 20A. The lamination operation refers to the following operations: laminating the spacer 22 on the electrode sheet 31A, and heating the periphery R22 of the laminated spacer 22 from the Z-axis direction to be welded 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 be welded to the spacer 22.

[0128] Specifically, if Figure 4As shown, the separator 22 is stacked on the negative electrode layer end electrode sheet 33A. Next, the peripheral edge R22 of the stacked separator 22 is heated from the Z-axis direction by the heating device 40 to be welded to the negative electrode layer end electrode sheet 33A. Thus, the negative electrode layer end electrode sheet 33A and the separator 22 are integrated to obtain a stacked integrated product 301.

[0129] Next, the electrode sheet 31A is stacked on the spacer 22 of the stacked integrated product 301. Next, the peripheral edge R21 of the sealing frame member 21 of the stacked electrode sheet 31A is heated from the Z-axis direction by the heating device 40 to be welded to the spacer 22 of the stacked integrated product 301. Thus, the stacked integrated product 301 and the electrode sheet 31A are integrated to obtain the stacked integrated product 302.

[0130] Next, the spacer 22 is stacked on the electrode sheet 31A of the stacked integrated product 302. Next, the peripheral edge R22 of the stacked spacer 22 is heated from the Z-axis direction by the heating device 40 to be welded to the electrode sheet 31A of the stacked integrated product 302. Thus, the stacked integrated product 302 and the spacer 22 are integrated to obtain a stacked integrated product 303.

[0131] Such stacking operation is repeated.

[0132] Finally, the positive electrode layer side terminal electrode sheet 32A is stacked on the spacer 22 of the stacked integrated product. Next, the peripheral edge R21 of the sealing frame member 21 of the stacked positive electrode layer side terminal electrode sheet 32A is heated from the Z-axis direction by the heating device 40 to be fused to the spacer 22 of the stacked integrated product. Thus, the stacked integrated product and the positive electrode layer side terminal electrode sheet 32A are integrated to form the electrode stack 10 and the sealing frame 20A. In other words, the first battery precursor is obtained. The first battery precursor has the same structure as the battery 1A except that the non-aqueous electrolyte is not contained in the housing T.

[0133] The heating method of the heating device 40 is not particularly limited as long as it is a method that can weld 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 roller, etc. can be listed. From the viewpoint of controlling the weld length L3 with high precision, the heating method of the heating device 40 is preferably laser heating.

[0134] (1.2.3) Decompression process

[0135] In the decompression step, the pressure in the housing T of the first cell precursor is reduced. As a result, the air in the housing T is discharged to the outside of the first cell precursor. As a result, the nonaqueous electrolyte is easily injected into the housing T. The method of reducing the pressure in the housing T may be any known method.

[0136] (1.2.4) Liquid injection process

[0137] In the liquid injection step, the nonaqueous electrolyte is injected into the housing portion T of the first battery precursor. In this way, the battery 1A is obtained. The nonaqueous electrolyte may be injected by any known method.

[0138] (1.3) Effects

[0139] As reference Figure 1 to Figure 4 As described above, the battery 1A includes an electrode stack 10, a sealing frame 20A, and a non-aqueous electrolyte. The bipolar electrode 11 includes a current collector 110, a positive electrode layer 111, and a negative electrode layer 112. The sealing frame 20A includes a sealing frame member 21 and a spacer 22. The spacer 22 includes a planar portion S22A1 and a convex portion S22A2 on the first surface S22A. The spacer 22 includes a planar portion S22B1 and a convex portion S22B2 on the second surface S22B. The sealing frame member 21 includes a planar portion S21A1 and a concave portion S21A2 on the first surface S21A. The sealing frame member 21 includes a planar portion S21B1 and a concave portion S21B2 on the second surface S21B. The convex portion S22A2 is fitted into the concave portion S21B2. The convex portion S22B2 is fitted into the concave portion S21A2.

[0140] As a result, a gap is not easily formed 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 not easily deformed. 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.

[0141] As reference Figure 1 to Figure 4 As described above, in a cross section of the battery 1A cut along a direction parallel to the Z-axis direction, the weld length L3 (see FIG. Figure 3 ) than the length L4 (reference Figure 3 )short.

[0142] Thus, compared with the case where all regions of the interface between the sealing frame member 21 and the spacer 22 are welded, stress caused by volume change is less likely to be locally applied to the sealing frame 20A. As a result, even when the battery 1A is subjected to a thermal cycle test, cracks are less likely to occur in the sealing frame 20A. In other words, the battery 1A has excellent sealing performance.

[0143] As reference Figure 1 to Figure 4 As explained above, the height L5 (see Figure 3 ) is greater than 0.25 times and less than 1 times the thickness of the current collector 110.

[0144] Thus, compared with a configuration in which the height L5 is not less than 0.25 times and not more than 1 times the thickness of the current collector 110 , the adhesion between the spacer 22 and the sealing frame member 21 is excellent.

[0145] As reference Figure 1 to Figure 4 As described above, the manufacturing method of the battery of the first embodiment is a method for manufacturing the battery 1A. The manufacturing method includes a preparation step and a stacking and welding step. The stacking operation means the following operation: stacking the spacer 22 on the electrode sheet 31A, and heating the periphery R22 of the stacked spacer 22 from the Z-axis direction to be welded to the electrode sheet 31A, stacking the electrode sheet 31A on the spacer 22, and heating the periphery R21 of the sealing frame member 21 of the stacked electrode sheet 31A from the Z-axis direction to be welded to the spacer 22.

[0146] Thus, the manufacturing method of the first embodiment can manufacture a battery 1A having excellent structural efficiency. In addition, the manufacturing method of the first embodiment performs welding by heating from the stacking direction (Z-axis direction), and it is 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 performance, and the structural efficiency of the battery 1A is improved.

[0147] As a result, the manufacturing method of the first embodiment can manufacture the battery 1A having excellent structural efficiency and excellent sealing properties.

[0148] (2) Second Embodiment

[0149] (2.1) Battery

[0150] The battery 1B according to the second embodiment of the present disclosure has the same configuration as the battery 1A according to the first embodiment except that the battery 1B does not include a separator.

[0151] like Figure 5 As shown, the battery 1B includes an electrode stack 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 stack 10 .

[0152] (2.1.1) Sealing frame

[0153] The sealing frame 20B has the same configuration as the sealing frame 20A except that it does not include a spacer.

[0154] like Figure 6 As shown, the sealing frame 20B has a plurality of sealing frame members 23. Figure 7As shown, the sealing frame member 23 is welded to a portion of the uncoated portion R10 (i.e., the peripheral edge R110) of the first main surface S110A of the collector 110. The sealing frame member 23 has an extension portion 230. The extension portion 230 extends from the collector 110 in a surface direction of the collector 110 that is orthogonal to the Z-axis direction (stacking direction). The extension portion 230 is directly connected to the adjacent sealing frame member 23. In other words, no spacer is provided between the adjacent sealing frame members 23.

[0155] In the second embodiment, a portion 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. Figure 7 As shown, in the direction orthogonal to the Z-axis direction, the length L6 (hereinafter also referred to as "welding length L6") of the interface welded portion of adjacent sealing frame members 23 from the side S20B of the sealing frame 20B is shorter than the length L7 from the side S20B of the sealing frame 20B to the collector 110.

[0156] The sealing frame member 23 is a square tube-shaped member having a rectangular cross section. In the second embodiment, the sealing frame member 23 is welded to the periphery R110 of the first main surface S110A of the current collector 110 of each of the plurality of bipolar electrodes 11 .

[0157] The surface S23A of the sealing frame member 23 disposed on the positive side of the Z axis of the sealing frame member 23 in contact with the surface S23B of the sealing frame member 23 disposed on the negative side of the Z axis in contact with the surface S23B is a plane. The sealing frame member 23 is welded to at least a portion of the uncoated portion of at least one of the surfaces of one side and the other side of the collector, and the sealing frame member 23 has an extension portion extending from the collector in the surface direction of the collector, and the extension portion is directly in contact with the adjacent sealing frame member.

[0158] In the second embodiment, the sealing frame member has a protrusion 231 protruding from the welding surface S23 welded to the current collector 110 in the extended portion 230. The thickness L8 in the Z-axis direction (stacking direction) from the welding surface S23 (see Figure 7 ) is greater than 1 times and less than 2 times the thickness of the current collector 110 (the length of the current collector 110 in the Z-axis direction).

[0159] Examples of the material of the sealing frame member 23 include polyethylene, polystyrene, acrylonitrile-butadiene-styrene copolymer resin (ABS resin), modified polypropylene, and acrylonitrile styrene resin.

[0160] (2.1.2) Purpose

[0161] The applications of the battery 1B include the same applications as those exemplified as the applications of the battery 1A.

[0162] (2.2) Manufacturing method

[0163] The method for manufacturing a battery according to the second embodiment includes a preparation step, a lamination welding step, a decompression step, and a liquid injection step. The preparation step, the lamination welding step, the decompression step, and the liquid injection step are performed in this order. Thus, a battery 1B is obtained.

[0164] (2.2.1) Preparation process

[0165] In the preparation step, a plurality of electrode tabs 31B, a plurality of separators 22 , a positive electrode layer terminal electrode tab 32B, and a negative electrode layer terminal electrode tab 33B are prepared.

[0166] The electrode sheet 31B includes the bipolar electrode 11 , the sealing frame member 23 , and the 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 .

[0167] The positive electrode layer end electrode sheet 32B includes the positive electrode layer end 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 end electrode 13.

[0168] The negative electrode layer end electrode sheet 33B includes the negative electrode layer end 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 end electrode 14.

[0169] The electrode tab 31B, the positive electrode layer end electrode tab 32B, and the negative electrode layer end electrode tab 33B may be prepared by any known method.

[0170] (2.2.2) Lamination welding process

[0171] In the lamination and welding step, lamination operations are repeatedly performed to form the electrode laminate 10 and the sealing frame 20B. The lamination operation is an operation of laminating the electrode sheet 31B on the electrode sheet 31B and heating the peripheral edge R23 of the sealing frame member 23 of the laminated electrode sheet 31B from the Z-axis direction to weld to the electrode sheet 31B.

[0172] Specifically, if Figure 8As shown, the electrode sheet 31B is stacked on the negative electrode layer end electrode sheet 33B. Next, the peripheral edge R23 of the sealing frame member 23 of the stacked electrode sheet 31B is heated from the Z-axis direction by the heating device 40 to be welded to the negative electrode layer end electrode sheet 33B. Thus, the negative electrode layer end electrode sheet 33B and the electrode sheet 31B are integrated to obtain a stacked integrated product 304.

[0173] Next, the electrode sheet 31B is stacked on the electrode sheet 31B of the stacked integrated product 304. Next, the peripheral edge R23 of the sealing frame member 23 of the stacked electrode sheet 31B is heated from the Z-axis direction by the heating device 40 to be welded to the sealing frame member 23 of the stacked integrated product 304. Thus, the stacked integrated product 304 and the electrode sheet 31B are integrated to obtain the stacked integrated product 305.

[0174] Such stacking operation is repeated.

[0175] Finally, the positive electrode layer side terminal electrode sheet 32B is stacked on the electrode sheet 31B of the stacked integrated product. Next, the peripheral edge R23 of the sealing frame member 23 of the stacked positive electrode layer side terminal electrode sheet 32B is heated from the Z-axis direction by the heating device 40 to be fused to the sealing frame member 23 of the stacked integrated product. Thus, the stacked integrated product and the positive electrode layer side terminal electrode sheet 32B are integrated to form the electrode stack 10 and the sealing frame 20B. In other words, the second battery precursor is obtained. The second battery precursor has the same structure as the battery 1B except that the non-aqueous electrolyte is not contained in the housing T.

[0176] The heating method of the heating device 40 may be the same method as that exemplified as the heating method of the heating device 40 in the first embodiment. From the viewpoint of accurately controlling the weld length L6, the heating method of the heating device 40 is preferably laser heating.

[0177] (2.2.3) Decompression process

[0178] In the decompression step, the pressure in the housing T of the second cell precursor is reduced. As a result, the air in the housing T is discharged to the outside of the second cell precursor. As a result, the nonaqueous electrolyte is easily injected into the housing T. The method of reducing the pressure in the housing T may be any known method.

[0179] (2.2.4) Liquid injection process

[0180] In the liquid injection step, the nonaqueous electrolyte is injected into the housing portion T of the second battery precursor. In this way, the battery 1B is obtained. The nonaqueous electrolyte may be injected by any known method.

[0181] (2.3) Effects

[0182] As reference Figures 5 to 8 As described above, the battery 1B includes the electrode stack 10, the sealing frame 20B, and the non-aqueous electrolyte. The bipolar electrode 11 includes the current collector 110, the positive electrode layer 111, and the negative electrode layer 112. The sealing frame 20B includes the sealing frame member 23. The sealing frame member 23 includes the extending portion 230. The extending portion 230 is directly connected to the adjacent sealing frame member 23.

[0183] As a result, a gap is not easily formed 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 not easily deformed. As a result, the side surface of the battery 1B formed by the sealing frame 20B becomes a vertical surface. As a result, the battery 1B has excellent structural efficiency.

[0184] As reference Figures 5 to 8 As described above, in a cross section cut along a direction parallel to the Z-axis direction, the weld length L6 (see Figure 7 ) is longer than the length L7 from the side surface S20B of the sealing frame 20B to the current collector 110 (see Figure 7 )short.

[0185] Thus, compared with the case where all regions of the interface between two adjacent sealing frame members 23 of the sealing frame members 23 are welded, stress caused by volume change is less likely to be locally applied to the sealing frame 20B. As a result, even if the battery 1B is subjected to a thermal cycle test, cracks are less likely to occur in the sealing frame 20B. In other words, the battery 1B has excellent sealing performance.

[0186] As reference Figures 5 to 8 As described above, the thickness L8 of the protrusion 231 in the Z-axis direction from the welding surface S23 (see Figure 7 ) is greater than 1 times and less than 2 times the thickness of the current collector 110.

[0187] Thus, in the battery 1B, the adhesion between the two adjacent sealing frame members 23 is excellent compared to a configuration in which the thickness L8 is not less than 1 times and not more than 2 times the thickness of the current collector 110 .

[0188] As reference Figures 5 to 8 As described above, the manufacturing method of the battery of the second embodiment is a method for manufacturing the battery 1B. The manufacturing method includes a preparation step and a stacking and welding step. The stacking operation refers to the following operation: stacking the electrode sheet 31B on the electrode sheet 31B, and heating the peripheral edge R23 of the sealing frame member 23 of the stacked electrode sheet 31B from the Z-axis direction to be welded to the electrode sheet 31B.

[0189] Thus, the manufacturing method of the second embodiment can manufacture a battery 1B having excellent structural efficiency. In addition, the manufacturing method of the second embodiment heats and welds the battery 1B from the stacking direction (Z-axis direction), making it easy to control the weld length L6. Therefore, it is not necessary to design the weld length L6 to be long in order to ensure the sealing performance, and the structural efficiency of the battery 1B is improved.

[0190] As a result, the manufacturing method of the second embodiment can manufacture the battery 1B having excellent structural efficiency and excellent sealing properties.

[0191] (3) Modification

[0192] In the first embodiment, the weld length L3 (see Figure 3 ) than the length L4 (reference Figure 3 ) is shorter, 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.

[0193] In the first embodiment, the height L5 (see Figure 3 ) is greater than or equal to 0.25 times and less than or equal to 1 times the thickness of the current collector 110, but the present disclosure is not limited thereto. In the present disclosure, the height L5 may also be outside the range of greater than or equal to 0.25 times and less than or equal to 1 times the thickness of the current collector 110.

[0194] In the second embodiment, the weld length L6 (see Figure 7 ) than the length L7 (reference Figure 7 ) is shorter, 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 longer than the length L7.

[0195] In the second embodiment, the thickness L8 of the sealing frame member 23 in the Z-axis direction (see Figure 7 ) is 1 to 2 times the thickness of the current collector 110, but the present disclosure is not limited thereto. In the present disclosure, L8 may also be outside the range of 1 to 2 times the thickness of the current collector 110.

[0196] In the first and second embodiments, the electrode stack 10 includes a plurality of bipolar electrodes 11, but the present disclosure is not limited thereto. In the present disclosure, the electrode stack 10 may include a single electrode instead of the plurality of bipolar electrodes 11. Figure 3 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.

Claims

1. A battery having: An electrode stack including a plurality of electrodes stacked in a stacking direction with separators interposed therebetween; a sealing frame that seals the side circumference of the electrode stack and forms a receiving portion between adjacent electrodes among the plurality of electrodes; and A non-aqueous electrolyte is contained in the containing portion. The electrode comprises at least one of a positive electrode layer and a negative electrode layer and a current collector, 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 includes a sealing frame member, and the sealing frame member is 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. The battery satisfies the following (A) or (B), (A): The sealing frame further includes a spacer, and the spacer is arranged 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 contacting 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 contacting 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 portion of the uncoated portion of one of the one surface and the other surface of the current collector, The sealing frame member has an extension portion extending from the current collector in a surface direction of the current collector orthogonal to the stacking direction. The extended portion is directly connected to the adjacent sealing frame member.

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

3. The battery according to claim 1 or 2, The battery satisfies (A), A height of the convex portion of the spacer from the first planar portion in the stacking direction is not less than 0.25 times and not more than 1 times the thickness of the current collector.

4. The battery according to claim 1 or 2, The battery satisfies (B), The sealing frame member has a protrusion on the extension portion that protrudes from a welding surface welded to the collector. The thickness of the protrusion in the stacking direction from the welded surface is not less than 1 time and not more than 2 times the thickness of the current collector.

5. A method for manufacturing a battery, which is a method for manufacturing the battery according to claim 1 that satisfies (A), The manufacturing method of the battery comprises: preparing an electrode sheet and the separator, wherein the electrode sheet includes the electrode, the sealing frame member, and the separator welded to the sealing frame member; and Repeating the lamination operation to form the electrode stack and the sealing frame, The cascade operation represents the following operation: The separator is stacked on the electrode sheet, and the periphery of the stacked separator is heated from the stacking direction to be welded to the electrode sheet. The electrode sheets are stacked on the separator, and the peripheral edges of the sealing frame member of the stacked electrode sheets are heated from the stacking direction to be welded to the separator.

6. A method for manufacturing a battery, which is a method for manufacturing the battery according to claim 1 that satisfies the above (B), The manufacturing method of the battery comprises: preparing an electrode sheet, the electrode sheet comprising the electrode, the sealing frame member, and the separator welded to the sealing frame member; and Repeating the lamination operation to form the electrode stack and the sealing frame, The stacking operation refers to an operation of stacking the electrode sheet on the electrode sheet and heating the peripheral edge of the sealing frame member of the stacked electrode sheet from the stacking direction to be welded to the electrode sheet.

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