Joining method for current collecting terminal and current collecting tab

Abstract

To provide a joining method for a current collecting terminal and a current collecting tab, which can join the current collecting terminal and the current collecting tab in a short time and that can prevent damage to the current collecting tab.SOLUTION: A joining method for a current collecting terminal and a current collecting tab, which includes stacking a current collecting terminal (110), a current collecting tab (120), and a metal protective member (130) in this order, and irradiating a laser (160) from the side of the metal protective member (130) to laser-weld the current collecting terminal (110), the current collecting tab (120), and the metal protective member (130) together.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a method for joining a current collecting terminal and a current collecting tab. [Background technology]

[0002] A battery generally includes an electrode laminate having a positive electrode current collector layer, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, and a negative electrode current collector layer. The electrode laminate of the battery is sealed in an internal space surrounded by an exterior material such as a laminate film. Some batteries are known in which electricity generated in the electrode laminate is conducted to the outside via a current collecting terminal joined to a current collecting tab of the electrode laminate. Summary of the Invention [Problem to be solved by the invention]

[0003] In batteries using the above-described current collecting terminals, joining the current collecting tab to the current collecting terminal using ultrasonic waves takes time, and joining the current collecting terminal to the current collecting tab using a laser instead of ultrasonic waves can generate excessive heat at the laser irradiated area, potentially damaging the current collecting tab.

[0004] Therefore, an object of the present disclosure is to provide a method for joining a current collecting terminal and a current collecting tab, which can join the current collecting terminal and the current collecting tab in a short time and can prevent damage to the current collecting tab. [Means for solving the problem]

[0005] The present disclosure achieves the above object by the following means.

[0006] <Aspect 1> Methods for joining current collecting terminals and current collecting tabs, including: stacking the current collecting terminal, the current collecting tab, and the metal protective member in this order; and A laser is irradiated from the side of the metal protective member to laser-weld the current collecting terminal, the current collecting tab, and the metal protective member together. <Aspect 2> 2. The method of embodiment 1, wherein the metallic protective member is made of the same material as the current collecting tab. <Aspect 3> A method for manufacturing a battery, comprising the steps of: forming the current collecting tab on a side surface of the electrode stack; Joining the current collecting terminal and the current collecting tab by the method according to aspect 1 or 2; and The joined electrode stack and the current collecting terminal are covered with a laminate film to seal the electrode stack. [Effects of the Invention]

[0007] According to the method for joining a current collecting terminal and a current collecting tab of the present disclosure, the current collecting terminal and the current collecting tab can be joined in a short time, and damage to the current collecting tab can be suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram for explaining a method for joining a current collecting terminal and a current collecting tab according to the present disclosure. [Figure 2] FIG. 2 is a schematic diagram illustrating the method for manufacturing a battery according to the present disclosure. [Figure 3] FIG. 3 is a schematic diagram for explaining the method for manufacturing a battery according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described in detail. Note that the present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the gist of the present disclosure. In addition, in the description of the drawings, the same elements are given the same reference numerals, and duplicated descriptions will be omitted.

[0010] <Method for joining current collecting terminals and current collecting tabs> The method for joining a current collecting terminal and a current collecting tab according to the present disclosure includes the steps of: stacking the current collecting terminal, the current collecting tab, and the metal protective member in this order; and irradiating a laser from the side of the metal protective member to laser-weld the current collecting terminal, the current collecting tab, and the metal protective member together; Includes:

[0011] According to the method for joining a current collecting terminal and a current collecting tab of the present disclosure, the current collecting terminal and the current collecting tab can be joined in a short time, and damage to the current collecting tab can be suppressed.

[0012] The present inventors have discovered that by placing a metal protective member on the current collecting tab and irradiating a laser from the side where the metal protective member is placed to laser-weld the current collecting terminal and the current collecting tab, the current collecting terminal and the current collecting tab can be joined in a short time and damage to the current collecting tab can be suppressed. Without being limited by theory, it is presumed that by placing a metal protective member and irradiating a laser from the side of the metal protective member, heat generation in the current collecting tab can be suppressed even in laser welding, thereby allowing the current collecting terminal and the current collecting tab to be joined in a short time and suppressing damage to the current collecting tab.

[0013] FIG. 1 is a schematic diagram showing one embodiment of the method for joining a current collecting terminal and a current collecting tab according to the present disclosure, but the present invention is not limited to this embodiment.

[0014] The electrode laminate 140 has a current collecting tab 120 on a side surface portion 140a of the electrode laminate 140. To join the current collecting terminal and the current collecting tab, first, as shown in FIG. 1A, the current collecting terminal 110, the current collecting tab 120, and the metal protective member 130 are stacked in this order. Next, as shown in FIG. 1B, a laser 160 is applied from the side of the metal protective member 130 to laser-weld the current collecting terminal 110, the current collecting tab 120, and the metal protective member 130 together. By applying the laser 160, a joint portion 120a is formed in the current collecting terminal 110, the current collecting tab 120, and the metal protective member 130, and the current collecting terminal 110 and the current collecting tab 120 are electrically joined. By positioning the metal protective member 130 and irradiating the laser 160 from the side of the metal protective member 130, heat generation in the current collecting tab 120 can be suppressed even when joining by laser, thereby allowing the current collecting terminal 110 and the current collecting tab 120 to be joined in a short time and suppressing damage to the current collecting tab 120.

[0015] <Laser welding> The method of laser welding is not particularly limited, but any known method used for laser welding can be appropriately adopted.

[0016] <Method for joining current collecting terminals and current collecting tabs; each configuration> The following describes each configuration of the joining method for the current collecting terminal and the current collecting tab.

[0017] <Collector terminal> The material of the current collecting terminal is not particularly limited, but metals such as aluminum and stainless steel (SUS) can be used.

[0018] <Current collecting tab> In the present disclosure, the current collector tabs are not particularly limited, but may be connected to the current collector layers of the electrode stack described below. For example, the current collector tab of the positive electrode may be connected to the positive electrode current collector layer, and the current collector tab of the negative electrode may be connected to the negative electrode current collector layer.

[0019] The material of the current collecting tab can be any material that can be used in batteries. The material of the positive electrode current collecting tab is not particularly limited, but aluminum is preferable. The material of the negative electrode current collecting tab is not particularly limited, but copper is preferable.

[0020] <Metal protection parts> The metal protective member is preferably made of the same material as the current collecting tab, although not particularly limited thereto. The thickness of the metal protective member is also not particularly limited, but may be 0.1 mm or more, 0.2 mm or more, or 0.5 mm or more, or 15 mm or less, 13 mm or less, 9.0 mm or less, 7.0 mm or less, or 5.0 mm or less, from the viewpoint of suppressing heat generation in the current collecting tab.

[0021] <Battery manufacturing method> The battery can be manufactured by the following steps: forming a current collecting tab on a side surface of the electrode stack; joining the current collecting terminal and the current collecting tab by the method of the present disclosure; and The joined electrode stack and the current collecting terminal are covered with a laminate film to seal the electrode stack.

[0022] According to the battery manufacturing method of the present disclosure, the current collecting terminal and the current collecting tab can be joined in a short time, and damage to the current collecting tab can be suppressed.

[0023] FIG. 2 is a schematic diagram showing one embodiment of the method for producing a battery according to the present disclosure, showing the vicinity of the current collecting terminal and the current collecting tab, but is not limited to this case.

[0024] In the battery manufacturing method of the present disclosure, first, as shown in FIG. 2A , a current collecting tab 120 is formed on a side surface 140a of an electrode laminate 140. Next, as shown in FIG. 2B , a current collecting terminal 110, a current collecting tab 120, and a metal protective member 130 are stacked in this order, and a laser 160 is irradiated from the side of the metal protective member 130. By irradiating with the laser 160, a joint 120a is formed in the current collecting terminal 110, the current collecting tab 120, and the metal protective member 130, and the current collecting terminal 110 and the current collecting tab 120 are electrically joined. Next, as shown in FIG. 2C , the current collecting tab is bent so that the laser irradiated surface 130a of the metal protective member 130 faces the side surface 140a of the electrode laminate 140. 2D , the joined electrode laminate 140 and current collecting terminal 110 are covered with a laminate film 150, for example by wrapping the laminate film 150 around the electrode laminate 140, and then heat-sealed at a heat-seal surface 140b of the electrode laminate where the electrode laminate 140 and the laminate film 150 come into contact, and at a heat-seal surface 110a of the current collecting terminal where the current collecting terminal 110 and the laminate film 150 come into contact, thereby sealing the electrode laminate 140. By providing a metal protective member 130 and irradiating the current collecting tab 120 with a laser 160 from the side of the metal protective member 130, heat generation in the current collecting tab 120 is suppressed even during laser joining, and as a result, the current collecting terminal 110 and the current collecting tab 120 can be joined in a short time and damage to the current collecting tab 120 can be suppressed.

[0025] FIG. 3 is a schematic diagram showing one embodiment of the method for producing a battery according to the present disclosure, and is a schematic diagram showing an overall image of an electrode stack and a battery, but is not limited to this case.

[0026] 3A, the bonded electrode stack 140 and current collecting terminal 110 are placed on a laminate film 150. As shown in Fig. 3B, the bonded electrode stack 140 and current collecting terminal 110 are covered with the laminate film 150, for example by wrapping, to seal the electrode stack 140. As a result, the electrode stack 140 is sealed in a space formed by being surrounded by the laminate film 150 and the current collecting terminal 110.

[0027] <Battery manufacturing method; each component> Each step in the battery manufacturing method will be described below.

[0028] The battery of the present disclosure may be a liquid-based battery containing an electrolytic solution as an electrolyte layer, or may be a solid-state battery having a solid electrolyte layer as an electrolyte layer. In the context of the present disclosure, a "solid-state battery" refers to a battery that uses at least a solid electrolyte as an electrolyte, and therefore a solid-state battery may use a combination of a solid electrolyte and a liquid electrolyte as an electrolyte. The battery of the present disclosure may also be an all-solid-state battery, i.e., a battery that uses only a solid electrolyte as an electrolyte.

[0029] In the present disclosure, a "composite" refers to a composition that can constitute a positive electrode active material layer, etc., either as it is or by further containing other components. Also, in the present disclosure, a "composite slurry" refers to a slurry that contains a dispersion medium in addition to a "composite" and can be applied and dried to form a positive electrode active material layer, etc.

[0030] <Electrode laminate> The electrode stack is not particularly limited, but may have a positive electrode current collector layer, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, and a negative electrode current collector layer in this order.

[0031] <Positive electrode current collector layer> The material used for the positive electrode current collector layer is not particularly limited, and any material commonly used for a battery positive electrode current collector can be appropriately adopted. Examples of materials used for the positive electrode current collector layer include, but are not limited to, Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, and stainless steel. The positive electrode current collector layer may have a coating layer on its surface for purposes such as adjusting resistance. The positive electrode current collector layer may also be a metal foil or a substrate on which the above metals are plated or vapor-deposited.

[0032] The shape of the positive electrode current collector layer is not particularly limited, but examples thereof include foil, plate, mesh, etc. Among these, foil is preferred.

[0033] The thickness of the positive electrode current collector layer is not particularly limited, but may be 0.1 μm or more, or 1 μm or more, and may be 1 mm or less, or 100 μm or less.

[0034] <Cathode active material layer> The positive electrode active material layer contains at least a positive electrode active material, and may further contain, optionally, a solid electrolyte, a conductive additive, a binder, etc. The positive electrode active material layer may also contain various other additives. The contents of the positive electrode active material, solid electrolyte, conductive additive, binder, etc. in the positive electrode active material layer may be appropriately determined depending on the desired battery performance. For example, when the entire positive electrode active material layer (total solid content) is taken as 100 mass%, the content of the positive electrode active material may be 40 mass% or more, 50 mass% or more, 60 mass% or more, or 100 mass% or less, or 90 mass% or less.

[0035] (Cathode active material) The material of the positive electrode active material is not particularly limited as long as it can absorb and release lithium ions. Examples of the positive electrode active material include lithium cobalt oxide (LiCoO), lithium nickel oxide (LiNiO), lithium manganese oxide (LiMnO), and nickel-cobalt-manganese oxide (NCM:LiCO 1 / 3 Ni 1 / 3 Mn 1 / 3 O2), lithium nickel-cobalt-aluminate (LiNi 0.8 (CoAl) 0.2 O2), Li 1+x Mn 2-x-y M y The material may be, but is not limited to, a different element-substituted Li-Mn spinel having a composition represented by O4 (M is one or more metal elements selected from Al, Mg, Co, Fe, Ni, and Zn).

[0036] The positive electrode active material may have a coating layer, although it is not particularly limited. The coating layer is a layer containing a substance that has lithium ion conductivity, low reactivity with the positive electrode active material and the solid electrolyte, and can maintain the shape of the coating layer without flowing even when in contact with the active material and the solid electrolyte. Specific examples of materials that constitute the coating layer include LiNbO3 and Li4Ti5O 12 , Li3PO4, etc., but are not limited to these.

[0037] The shape of the positive electrode active material is not particularly limited as long as it is a general shape for a positive electrode active material of a battery. The positive electrode active material may be, for example, in the form of particles. The positive electrode active material may be in the form of primary particles or secondary particles formed by agglomeration of a plurality of primary particles. The average particle diameter D of the positive electrode active material 50 The average particle size D may be, for example, 1 nm or more, 5 nm or more, or 10 nm or more, and may be 500 μm or less, 100 μm or less, 50 μm or less, or 30 μm or less. 50 is the particle size (median size) at 50% cumulative value in the volume-based particle size distribution determined by laser diffraction / scattering method.

[0038] (solid electrolyte) The material of the solid electrolyte is not particularly limited, and may be, for example, a sulfide solid electrolyte, an oxide solid electrolyte, or a polymer electrolyte.

[0039] Examples of sulfide solid electrolytes include, but are not limited to, sulfide-based amorphous solid electrolytes, sulfide-based crystalline solid electrolytes, and argyrodite-type solid electrolytes. Specific examples of sulfide solid electrolytes include Li2S-P2S5-based (Li7P3S 11 , Li3PS4, Li8P2S9, etc.), Li2S-SiS2, LiI-Li2S-SiS2, LiI-Li2S-P2S5, LiI-LiBr-Li2S-P2S5, Li2S-P2S5-GeS2 (Li 13 GeP3S 16 , Li 10 GeP2S 12 ), LiI-Li2S-P2O5, LiI-Li3PO4-P2S5, Li 7-xPS 6-x Cl x etc.; or combinations thereof, but are not limited to these.

[0040] An example of an oxide solid electrolyte is Li7La3Zr2O 12 , Li 7-x La3Zr 1-x Nb x O 12 , Li 7-3x La3Zr2Al x O 12 , Li 3x La 2 / 3-x TiO3, Li 1+x Al x Ti 2-x (PO4)3, Li 1+x Al x Ge 2-x (PO4)3, Li3PO4, or Li 3+x PO 4-x N x (LiPON), etc.; or combinations thereof.

[0041] The sulfide solid electrolyte and the oxide solid electrolyte may be glass or crystallized glass (glass ceramics).

[0042] Examples of polymer electrolytes include, but are not limited to, polyethylene oxide (PEO), polypropylene oxide (PPO), and copolymers thereof.

[0043] (Conductive additive) The conductive additive is not particularly limited. The conductive additive may be, for example, vapor grown carbon fiber (VGCF), acetylene black (AB), ketjen black (KB), carbon nanotube (CNT), carbon nanofiber (CNF), etc., but is not limited thereto. The conductive additive may be, for example, particulate or fibrous, and its size is not particularly limited. The conductive additive is not particularly limited, but one type may be used alone, or two or more types may be used in combination.

[0044] (binder) The binder is not particularly limited. The binder may be, for example, polyvinylidene fluoride (PVdF), butadiene rubber (BR), polytetrafluoroethylene (PTFE), styrene butadiene rubber (SBR), or other materials, but is not limited to these. The binder is not particularly limited, and one type may be used alone, or two or more types may be used in combination.

[0045] The shape of the positive electrode active material layer is not particularly limited, and may be, for example, a substantially flat sheet-like positive electrode active material layer. The thickness of the positive electrode active material layer is not particularly limited, and may be, for example, 0.1 μm or more, 1 μm or more, or 10 μm or more, and may be 2 mm or less, 1 mm or less, or 500 μm or less.

[0046] The positive electrode active material layer can be produced by applying a known method. For example, the positive electrode active material layer can be easily formed by dry or wet molding a positive electrode composite containing the above-mentioned various components. The positive electrode active material layer may be formed together with the positive electrode current collector layer or may be formed separately from the positive electrode current collector layer.

[0047] <Electrolyte layer - solid electrolyte layer> The battery of the present disclosure can be a solid-state battery, i.e., have a solid electrolyte layer as an electrolyte layer. The solid electrolyte layer contains at least a solid electrolyte and may also contain a conductive additive, a binder, etc. as necessary.

[0048] For the solid electrolyte, the conductive additive, and the binder, reference can be made to the above description of "<Positive Electrode Active Material Layer>".

[0049] The thickness of the solid electrolyte layer is not particularly limited, but may be, for example, 0.1 μm or more, 1 μm or more, or 10 μm or more, and may be 2 mm or less, 1 mm or less, or 500 μm or less.

[0050] The solid electrolyte layer can be easily formed, for example, by dry or wet molding a solid electrolyte mixture containing the above-mentioned solid electrolyte and a binder.

[0051] <Electrolyte layer-electrolyte> The battery of the present disclosure can be a liquid battery, i.e., have an electrolyte solution as the electrolyte layer, particularly an electrolyte solution held in a separator layer.

[0052] (electrolyte) The electrolyte is not particularly limited, but preferably contains a supporting salt and a solvent.

[0053] The supporting salt (lithium salt) of the electrolyte solution having lithium ion conductivity is not particularly limited, but examples thereof include inorganic lithium salts and organic lithium salts. Examples of inorganic lithium salts include, but are not limited to, LiPF, LiBF, LiClO, and LiAsF. Examples of organic lithium salts include, but are not limited to, LiCF, SO, LiN(CF, SO), LiN(CF, SO), LiN(FSO), LiC(CF, SO), and LiC(CF, SO).

[0054] The solvent used in the electrolyte solution is not particularly limited, but examples thereof include cyclic carbonates, chain carbonates, etc. Examples of cyclic carbonates include, but are not limited to, ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), etc. Examples of chain carbonates include, but are not limited to, dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), etc. The electrolyte solution is not particularly limited, but one type may be used alone, or two or more types may be used in combination.

[0055] (separator) The separator is not particularly limited, and any separator commonly used for batteries can be appropriately used, such as a polyolefin-based, polyamide-based, or polyimide-based nonwoven fabric.

[0056] <Negative electrode active material layer> The negative electrode active material layer contains at least a negative electrode active material, and may further contain, optionally, a conductive additive, a binder, a solid electrolyte, and the like. The negative electrode active material layer may also contain various other additives. The contents of the negative electrode active material, solid electrolyte, conductive additive, binder, and the like in the negative electrode active material layer may be appropriately determined depending on the desired battery performance. For example, when the entire negative electrode active material layer (total solid content) is taken as 100 mass%, the content of the negative electrode active material may be 40 mass% or more, 50 mass% or more, or 60 mass% or more, or may be 100 mass% or less, or 90 mass% or less.

[0057] (Negative electrode active material) As the negative electrode active material, various substances can be used that have a potential (charge / discharge potential) for absorbing and releasing lithium ions that is lower than that of the positive electrode active material of the present disclosure. The material for the negative electrode active material is not particularly limited, and may be metallic lithium or a material capable of absorbing and releasing metal ions such as lithium ions. Examples of materials capable of absorbing and releasing metal ions such as lithium ions include alloy-based negative electrode active materials, carbon materials, and lithium titanate (Li4Ti5O 12 ) and the like can be mentioned, but are not limited to these.

[0058] The alloy-based negative electrode active material is not particularly limited, and examples thereof include Si alloy-based negative electrode active materials and Sn alloy-based negative electrode active materials. Examples of Si alloy-based negative electrode active materials include silicon, silicon oxide, silicon carbide, silicon nitride, and solid solutions thereof. The Si alloy-based negative electrode active material may contain metal elements other than silicon, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Sn, and Ti. Examples of Sn alloy-based negative electrode active materials include tin, tin oxide, tin nitride, and solid solutions thereof. The Sn alloy-based negative electrode active material may contain metal elements other than tin, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Ti, and Si.

[0059] The carbon material is not particularly limited, and examples thereof include hard carbon, soft carbon, graphite, and the like.

[0060] The shape of the negative electrode active material is not particularly limited, and may be any shape commonly used for negative electrode active materials in batteries. The negative electrode active material may be, for example, in the form of particles or a sheet.

[0061] For the solid electrolyte, conductive additive, and binder that can be contained in the negative electrode active material layer, the description in the "<Positive electrode active material layer>" above can be referred to.

[0062] The shape of the negative electrode active material layer is not particularly limited, and may be, for example, a substantially flat sheet-like negative electrode active material layer. The thickness of the negative electrode active material layer is not particularly limited, and may be, for example, 0.1 μm or more, 1 μm or more, or 10 μm or more, and may be 2 mm or less, 1 mm or less, or 500 μm or less.

[0063] The negative electrode active material layer can be produced by applying a known method. For example, the negative electrode active material layer can be easily formed by dry or wet molding a negative electrode composite containing the above-mentioned various components. The negative electrode active material layer may be formed together with the negative electrode current collector layer or may be formed separately from the negative electrode current collector layer.

[0064] <Negative electrode current collector layer> The material used for the negative electrode current collector layer is not particularly limited, and any material commonly used for a negative electrode current collector in a battery can be appropriately used. Examples of materials used for the negative electrode current collector layer include, but are not limited to, Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, stainless steel, and a carbon sheet. The negative electrode current collector layer may have a coating layer on its surface for the purpose of adjusting resistance, etc.

[0065] The shape of the negative electrode current collector layer is not particularly limited, but examples thereof include foil, plate, mesh, etc. Among these, foil is preferred.

[0066] The thickness of the negative electrode current collector layer is not particularly limited, but may be 0.1 μm or more, or 1 μm or more, and may be 1 mm or less, or 100 μm or less.

[0067] <Laminating film> The laminate film has a fusion layer and a metal layer. The laminate film is not particularly limited, but may have a fusion layer, a metal layer, and a resin layer in this order.

[0068] (fusion layer) The material of the fusion layer is not particularly limited, but may be polyolefin resin, etc. Examples of polyolefin resins include, but are not limited to, polypropylene (PP) and polyethylene (PE). The thickness of the fusion layer is not particularly limited, but may be 30 μm or more, 40 μm or more, or 50 μm or more, or 110 μm or less, 100 μm or less, or 90 μm or less.

[0069] (metal layer) Examples of materials for the metal layer include, but are not limited to, aluminum, aluminum alloys, stainless steel, etc. The thickness of the metal layer is not particularly limited, but may be 20 μm or more, 30 μm or more, or 40 μm or more, or 70 μm or less, 60 μm or less, or 50 μm or less.

[0070] (resin layer) Examples of materials for the resin layer include, but are not limited to, polyethylene terephthalate, nylon, etc. The thickness of the resin layer is not particularly limited, but may be 70 μm or more, 80 μm or more, or 90 μm or more, or 270 μm or less, 250 μm or less, or 230 μm or less.

[0071] For the current collecting terminal and the current collecting tab, please refer to the description in "Method for joining current collecting terminal and current collecting tab; each configuration" above.

[0072] <Battery uses, etc.> The battery in the present disclosure is not particularly limited, and may be a lithium-ion secondary battery. The battery in the present disclosure may be, for example, an in-vehicle battery, or may be used as a power source for a moving body other than a vehicle (for example, a train, a ship, or an airplane), or may be used as a power source for an electrical appliance such as an information processing device.

[0073] While embodiments of the disclosed method for joining current collector terminals and current collector tabs, and method for manufacturing batteries have been described, those skilled in the art will recognize that modifications may be made without departing from the scope of the claims. [Explanation of symbols]

[0074] 100 batteries 110 Current collector terminal 110a Heat seal surface of current collecting terminal 120 Current collecting tab 120a joint 130 Metal protective components 130a Laser irradiation surface 140 Electrode laminate 140a Side part 140b Heat seal surface of electrode laminate 150 Laminating Film 160 Laser

Claims

1. A method for joining current collecting terminals and current collecting tabs, including: stacking the current collecting terminal, the current collecting tab, and the metal protective member in this order; and A laser is irradiated from the side of the metal protective member to laser-weld the current collecting terminal, the current collecting tab, and the metal protective member together.

2. The method of claim 1 , wherein the metallic protective member is constructed from the same material as the current collecting tab.

3. A method for manufacturing a battery, comprising the steps of: forming the current collecting tab on a side surface of the electrode stack; Joining the current collecting terminal and the current collecting tab by the method of claim 1 or 2; and The joined electrode stack and the current collecting terminal are covered with a laminate film to seal the electrode stack.

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