Manufacturing method of laminate battery

Abstract

To seal an electrode stack by welding a laminate film and a resin member, and to eliminate the volume that occurs when laminate films are welded together.SOLUTION: A laminate battery manufacturing method includes the steps of: providing an electrode laminate 200 having resin members 300 on its sides; sandwiching the electrode laminate 200 between laminate films 100; and sealing the electrode laminate 200 by welding the resin members 300 and the laminate films 100.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a laminate battery. [Background technology]

[0002] A laminate battery is a battery in which an electrode laminate having, for example, 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 is covered with a laminate film and sealed.

[0003] For example, Patent Document 1 discloses a battery comprising an electrode assembly, a side member disposed on a side surface of the electrode assembly, and a laminate film covering the electrode assembly, wherein, when the battery is viewed from the side of the side member, the outer edge of the side member is located inside the outer edge of the electrode assembly, the laminate film is disposed so as to cover the surface constituting the outer edge of the side member and the surface constituting the outer edge of the electrode assembly, and a fused portion where the inner surfaces of the laminate film are fused together is disposed on the side member. The battery described in Patent Document 1 is said to be able to suppress deterioration of sealing performance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-163373 Summary of the Invention [Problem to be solved by the invention]

[0005] For example, when sealing the electrode stack with a laminate film as described above, a method is conceivable in which the welding layers of the laminate film are welded to each other to form a laminate film welding part, In this case, the laminate film welding part may increase the volume of the laminate battery, i.e., the energy density of the laminate battery may decrease.

[0006] Therefore, an object of the present disclosure is to suppress an increase in the volume of a laminate battery due to the formation of a laminate film welded portion, i.e., to suppress a decrease in the energy density of a laminate battery due to the formation of a laminate film welded portion. [Means for solving the problem]

[0007] The present disclosure achieves the above object by the following procedures.

[0008] A method for manufacturing a laminated battery, comprising the steps of: To provide an electrode laminate having a resin member on a side surface, sandwiching the electrode stack between laminate films; and The resin member and the laminate film are welded together to seal the electrode stack. [Effects of the Invention]

[0009] According to the method of the present disclosure, it is possible to suppress an increase in the volume of a laminate battery due to the formation of a laminate film welded portion, that is, a decrease in the energy density of a laminate battery due to the formation of a laminate film welded portion. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram illustrating a step of providing an electrode laminate having a resin member on the side surface in the method for producing a laminate battery according to the present disclosure. [Figure 2] FIG. 2 is a schematic diagram illustrating a step of sandwiching an electrode stack between laminate films and welding a resin member and the laminate films to seal the electrode stack, in the method for manufacturing a laminate battery of the present disclosure. [Figure 3] FIG. 3 is a schematic diagram for explaining another embodiment of the present disclosure. [Figure 4] FIG. 4 is a schematic diagram for explaining a method for manufacturing a laminate battery according to the prior art. DETAILED DESCRIPTION OF THE INVENTION

[0011] <Laminate battery manufacturing method> The disclosed method for manufacturing a laminate battery includes: To provide an electrode laminate having a resin member on a side surface, sandwiching the electrode stack between laminate films; and the resin member and the laminate film are welded together to seal the electrode stack. Includes:

[0012] According to the above-described method for manufacturing a laminate battery, it is possible to suppress an increase in the volume of the laminate battery due to the formation of a laminate film welded portion, that is, a decrease in the energy density of the laminate battery due to the formation of a laminate film welded portion.

[0013] Figure 4 shows a conventional method for manufacturing a laminate battery. In this method, an electrode stack 200 is sandwiched between laminate films 100 (Figure 4(a)). Then, the welding layers of the laminate films 100 are welded together (Figure 4(b)).

[0014] When welding the welding layers of the laminate film 100 together, it is necessary to fold and overlap the laminate film 100 so that the welding layers of the laminate film 100 come into contact with each other. Therefore, when welding the welding layers of the laminate film 100 together to form the laminate film welding part 400, it is thought that the volume of the laminate battery will increase.

[0015] In contrast, according to the present disclosure, it is possible to suppress an increase in the volume of a laminate battery due to the formation of a laminate film welded portion, that is, a decrease in the energy density of a laminate battery due to the formation of a laminate film welded portion.

[0016] 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.

[0017] (Step of Providing an Electrode Stack) In the method for producing a laminate battery of the present disclosure, first, an electrode laminate having a resin member on the side surface is provided.

[0018] FIG. 1 shows a method for manufacturing a laminate battery according to an embodiment of the present disclosure. FIG. 1(a) is a cross-sectional view of an electrode laminate used in the method of the present disclosure. The electrode laminate 200 has a resin member 300 on its side surface. FIGS. 1(b) and 1(c) are top views of the electrode laminate used in the method of the present disclosure. In the present disclosure, the electrode laminate 200 may have the resin member 300 on a portion of its side surface (FIG. 1(b)), or on the entire side surface (FIG. 1(c)).

[0019] In this disclosure, the side surface refers to the end surface perpendicular to the stacking direction of the electrode stack, which is the vertical direction in Figure 1(a). Also, in this disclosure, the stacking direction refers to the stacking direction of the electrode stack.

[0020] (Clamping process) In the method for producing a laminate battery of the present disclosure, the electrode stack is then sandwiched between laminate films.

[0021] FIG. 2 shows a method for manufacturing a laminated battery according to an embodiment of the present disclosure. FIG. 2(a) is a cross-sectional view of a laminated battery manufactured by the method of the present disclosure. FIG. 2(b) is a top view of the electrode laminate used in FIG. 2(a). An electrode laminate 200 having resin members 300 on its side surfaces is sandwiched between laminate films 100. At this time, the laminate films 100 are placed so that they contact both the electrode laminate 200 and the resin members 300 on the top and bottom surfaces of the electrode laminate, respectively.

[0022] (Sealing process) In the method for producing a laminate battery of the present disclosure, the resin member and the laminate film are then welded together to seal the electrode stack.

[0023] The welding layer of the laminate film 100 and the top and bottom surfaces of the resin member 300 are welded to form a resin welding part 410, and the electrode stack 200 is sealed with the laminate film 100 (FIG. 2(a)). FIG. 2(b) is an example of the electrode stack used in FIG. 2(a), and is not limited to this.

[0024] In the present disclosure, the resin welded portion is a portion where the resin member and the welded layer of the laminate film are welded together.

[0025] FIG. 3(a) is a cross-sectional view of a laminate battery manufactured by the method of the present disclosure. FIG. 3(b) is a top view of the electrode laminate used in FIG. 3(a). In FIG. 2, the resin member 300 is provided on all of the side surfaces of the electrode laminate 200, but this is not limited to this case. Therefore, for example, as shown in FIG. 3(b), it is sufficient that the resin member 300 is provided on at least a portion of the side surfaces of the electrode laminate 200. Furthermore, when a resin member is provided on a portion of the side surfaces of the electrode laminate, a laminate film welding portion may be formed on the side surfaces that do not have the resin member (FIG. 3(a)).

[0026] Furthermore, when sealing the electrode stack with a laminate film, a laminate film welding portion may be optionally included. For example, as shown in Figure 3(a), a laminate film welding portion may be included in a part of the laminate battery.

[0027] <Each configuration> Each component used in the method of the present disclosure will be described below.

[0028] (electrode laminate) In the present disclosure, the electrode stack may be a liquid-based electrode stack or a solid electrode stack. In the present disclosure, a "solid electrode stack" refers to an electrode stack that uses at least a solid electrolyte as the electrolyte, and therefore the solid electrode stack may use a combination of a solid electrolyte and a liquid electrolyte (particularly a gel electrolyte) as the electrolyte. The solid electrode stack of the present disclosure may also be an all-solid electrode stack, i.e., an electrode stack that uses only a solid electrolyte as the electrolyte.

[0029] In the present disclosure, the electrode laminate is not particularly limited, and may have at least 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. The electrode laminate may be, for example, a plurality of sub-electrode laminates, each of which has 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 stacked in this order, with the positive electrode current collector layer and / or the negative electrode current collector layer being shared between adjacent sub-electrode laminates.

[0030] (Resin parts) In the present disclosure, the material of the resin member is not particularly limited, but it is desirable that the material has a melting point close to that of the material of the welding layer of the laminate film.

[0031] In addition, in order to reduce moisture penetration into the interior of the laminate battery through the resin member, a waterproof material and / or a water-absorbing material may be mixed into the resin member or applied to the surface of the resin member.

[0032] (laminating film) In the present disclosure, the laminate film is not particularly limited, but may have a welding layer, a metal layer, and a resin layer in this order.

[0033] (welding layer) The material of the welding layer is not particularly limited, but examples thereof include polyolefin resins. Examples of polyolefin resins include polypropylene (PP) and polyethylene (PE). The thickness of the welding layer is not particularly limited, but may be 3 It may be 100 μm or more, 40 μm or more, or 50 μm or more, and may be 110 μm or less, 100 It may be 90 μm or less.

[0034] (metal layer) Examples of materials for the metal layer include aluminum, aluminum alloys, and stainless steel. The thickness of the metal layer is not particularly limited, but may be 20 It may be 70 μm or less, 60 μm or less, 30 μm or more, or 40 μm or more. It may be 50 μm or less, or 50 μm or less.

[0035] (resin layer) Examples of materials for the resin layer include polyethylene terephthalate and nylon. The thickness of the resin layer is not particularly limited, but is preferably 70 μm or more. , 80 μm or more, or 90 μm or more, 270 μm or less, 250 μm or less, Alternatively, it may be 230 μm or less. [Explanation of symbols]

[0036] 100 Laminating Film 200 Electrode laminate 300 Resin parts 400 Laminate film welding part 410 Resin weld part

Claims

[Claim 1] A method for manufacturing a laminate battery, comprising the steps of: To provide an electrode laminate having a resin member on a side surface, sandwiching the electrode stack between laminate films; and The resin member and the laminate film are welded together to seal the electrode stack.

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