Method for manufacturing power storage device

Abstract

To provide a method for manufacturing a power storage device with which air between a battery and an exterior body can be removed by using a suction type pressure reducing device to manufacture a power storage device.SOLUTION: A method for manufacturing a power storage device of the present disclosure is to manufacture a power storage device. The power storage device comprises a battery, and an exterior body formed of a laminate sheet. The exterior body has a storage portion and a seal portion. The manufacturing method includes: preparing the battery, the laminate sheet, and a component including an insertion path forming component; laminating and welding the ends of the laminate sheet to each other with the component therebetween to form a primary seal portion sandwiching the component; pulling out the insertion path forming component from the primary seal portion to form an insertion path; inserting a tube for pressure reduction into the insertion path to reduce the pressure inside the storage portion; and welding to seal a portion that forms the insertion path to form the seal portion.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a method for manufacturing an electricity storage device. [Background technology]

[0002] Patent Document 1 discloses a storage cell (hereinafter, also referred to as a "battery"). The battery includes a positive electrode layer, a negative electrode layer, a separator, a spacer (hereinafter, also referred to as a "resin body"), and a specific reinforcing member. The positive electrode layer and the negative electrode layer have an active material layer on one side of a current collector made of metal foil. The positive electrode layer and the negative electrode layer are arranged so that the active material layers face each other. A separator is arranged between the positive electrode layer and the negative electrode layer and is interposed between the active material layers. A spacer is arranged between the positive electrode layer and the negative electrode layer, and seals the edge portion of the current collector so as to surround the active material layer, forming a storage space in which an electrolyte (hereinafter, also referred to as a "non-aqueous electrolyte") is stored. Such a battery may be covered with an exterior body (hereinafter, also referred to as an "exterior body") composed of a laminate sheet that is an exterior body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-069042 Summary of the Invention [Problem to be solved by the invention]

[0004] When covering a battery with an exterior body, the work may be carried out under reduced pressure in order to improve the sealing between the battery and the exterior body.

[0005] As a method for removing the air between the battery and the exterior body, there is a method of covering the battery with the exterior body in a decompression chamber. Hereinafter, the battery covered with the exterior body is also referred to as the "electricity storage device". However, in this method, a load due to the pressure difference between the inside and outside of the electricity storage device may be applied to the electricity storage device. In order to suppress the load, a complex design is required to restrain the electricity storage device. Large-scale equipment is required. Therefore, a method is required to remove the air between the battery and the exterior body under normal pressure (1 atmosphere) using a suction-type decompression device, which is an inexpensive and simple facility. The suction-type decompression device includes a decompression tube and a vacuum pump connected to the decompression tube.

[0006] The present disclosure has been made in view of the above-mentioned circumstances. An object of one embodiment of the present disclosure is to provide a method for manufacturing an electricity storage device, which can manufacture an electricity storage device by removing air between a battery and an exterior body using a suction-type pressure reduction device. [Means for solving the problem]

[0007] Means for solving the above problems include the following embodiments.

[0008] <1> The method for producing the electricity storage device according to the first aspect of the present disclosure includes: A method for manufacturing an electricity storage device, comprising the steps of: The power storage device includes a battery and an exterior body formed of a laminate sheet, the exterior body has a storage portion that stores the battery and the nonaqueous electrolyte, and a sealing portion that is formed by welding ends of the laminate sheet to each other, preparing the battery, the laminate sheet, and a part including an insertion path forming part that forms an insertion path for connecting a vacuum tube to the housing portion (hereinafter also referred to as a "vacuum tube connecting part") (hereinafter also referred to as a "preparation step"); overlapping and welding the ends of the laminate sheet together via the component to form the storage area and a primary seal area sandwiching the component (hereinafter also referred to as the "primary welding step"); Pulling out the insertion path forming component from the primary seal portion sandwiching the component to form the insertion path in the primary seal portion (hereinafter also referred to as a "pulling out process"); inserting the decompression tube into the insertion path to decompress the storage portion (hereinafter also referred to as the "decompression step"); a portion of the primary seal portion that forms the insertion path is welded and sealed to form the seal portion (hereinafter also referred to as a "secondary welding step"); The present invention relates to a method for manufacturing an electricity storage device.

[0009] The term "battery" refers to a battery including a monopolar electrode body or a bipolar electrode body. The monopolar electrode body refers to an electrode body in which a positive electrode current collector, a positive electrode composite layer, a separator, a negative electrode composite layer, and a negative electrode current collector are laminated in this order. The bipolar electrode body refers to an electrode body including a plurality of bipolar electrodes laminated via separators. The bipolar electrode has a current collector, a positive electrode composite layer formed on a first main surface of the current collector, and a negative electrode composite layer formed on a second main surface opposite to the first main surface of the current collector. The term "exterior body" refers to a case made of a laminate sheet. The term "laminate sheet" refers to a sheet having at least a metal layer, a first resin layer laminated on one main surface of the metal layer, and a second resin layer laminated on the other main surface of the metal layer. The term "sealed portion" refers to a portion formed by welding the ends of the laminate sheet together to seal the battery. When the exterior body has one laminate sheet, "the ends of the laminate sheet" refers to the first end and the second end of the single laminate sheet. When the exterior body has multiple laminate sheets, "the ends of the laminate sheets" refers to the end of the first laminate sheet and the end of the second laminate sheet.

[0010] In the first embodiment, the preparation step, the primary welding step, the drawing step, the depressurization step, and the secondary welding step are performed in this order. In the method for producing an electricity storage device of the first embodiment, the electricity storage device can be produced by removing air between the battery and the exterior body using a suction-type depressurization device.

[0011] <2> A method for producing an electricity storage device according to a second aspect of the present disclosure includes: the power storage device further includes a resin part having a through hole communicating between the housing portion and the insertion path, The resin part is accommodated in the accommodation portion, In the decompression, a tip of the decompression tube is inserted into the through hole to decompress the storage portion. <1> 2 is a method for producing the power storage device according to the first embodiment.

[0012] In a second aspect, the energy storage device further includes a resin part having a through hole. In the decompression step, a tip of the decompression tube is inserted into the through hole. As a result, in the second aspect, the decompression tube is less likely to become clogged in the decompression step than in a configuration in which the energy storage device does not include a resin part. As a result, the method for manufacturing an energy storage device of the second aspect can efficiently remove air between the battery and the exterior body.

[0013] <3> A method for producing an electricity storage device according to a third aspect of the present disclosure includes: The part further includes a tubular part into which the insertion path forming part is inserted, for guiding the decompression tube into the insertion path, the tubular part has a resin wall, The resin wall is welded to the laminate sheet at the primary seal portion, In the decompression, the decompression tube is inserted into the insertion path via the tubular part. <2> 2 is a method for producing the power storage device according to the first embodiment.

[0014] In a third aspect, the pressure reducing tube connecting part further includes a tubular part. In the primary welding step, the resin wall of the tubular part is welded to the laminate sheet. That is, the tubular part is fixed to the primary seal site. This makes it easier for the manufacturing method for an electricity storage device of the third aspect to connect the pressure reducing tube to the space between the battery and the exterior body than a configuration in which the pressure reducing tube connecting part does not include a tubular part.

[0015] <4> A method for producing an electricity storage device according to a fourth aspect of the present disclosure includes: the laminate sheet has a resin layer disposed on the battery side, The resin contained in the resin layer and the resin contained in the resin wall are of the same kind. <3> 2 is a method for producing the power storage device according to the first embodiment.

[0016] In the fourth aspect, the resin layer and the resin wall are more reliably welded together than in a configuration in which the resin contained in the resin layer of the laminate sheet and the resin contained in the resin wall of the tubular part are not the same type, and therefore the manufacturing method for the electricity storage device of the fourth aspect can more reliably connect the pressure reducing tube to the space between the battery and the exterior body.

[0017] <5> A method for producing an electricity storage device according to a fourth aspect of the present disclosure includes: the laminate sheet has a resin layer disposed on the battery side, The insertion path forming component is a resin rod, The melting point of the resin contained in the resin rod is higher than the melting point of the resin contained in the resin layer. <1> ~ <4> 2 is a method for manufacturing the power storage device according to any one of the above.

[0018] In the fifth aspect, the melting point of the resin contained in the resin rod is higher than the melting point of the resin contained in the resin layer. This makes it difficult for the resin rod to be welded to the laminate sheet by carrying out the primary welding process. Therefore, in the pulling-out process, the resin rod can be more easily pulled out from the primary seal portion that sandwiches the part for connecting the vacuum tube. As a result, the manufacturing method of the storage device of the fifth aspect can efficiently remove the air between the battery and the exterior body using a suction-type pressure reducing device to manufacture the storage device. Effect of the Invention

[0019] According to the present disclosure, there is provided a method for manufacturing an electricity storage device, which can manufacture an electricity storage device by removing air between a battery and an exterior body using a suction-type pressure reduction device. [Brief description of the drawings]

[0020] [Figure 1]FIG. 1 is an external perspective view of a power storage device according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is an external perspective view of a battery and a resin part according to an embodiment of the present disclosure. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is an external perspective view of a decompression tube connecting component according to an embodiment of the present disclosure. [Diagram 5] FIG. 5 is an explanatory diagram for explaining a manufacturing method of an electricity storage device according to an embodiment of the present disclosure. [Figure 6] FIG. 6 is an explanatory diagram for explaining a manufacturing method of a power storage device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] In the present disclosure, a numerical range indicated using "~" means a range including the numerical values ​​described before and after "~" as the minimum and maximum values, respectively. In the numerical ranges described in stages in the present disclosure, the upper limit or lower limit described in a certain numerical range may be replaced with the upper limit or lower limit of another numerical range described in stages. In the present disclosure, a combination of two or more preferred embodiments is a more preferred embodiment. In the present disclosure, the term "process" includes not only an independent process, but also a process that cannot be clearly distinguished from other processes, as long as the intended purpose of the process is achieved.

[0022] Hereinafter, an embodiment of a manufacturing method for an electricity storage device according to the present disclosure will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0023] (1) Manufacturing method The manufacturing method of the energy storage device according to the embodiment of the present disclosure manufactures the energy storage device 1. The manufacturing method includes a preparation step, an arrangement step S1, a primary welding step S2, a pulling out step S3, a depressurization step S4, a secondary welding step S5, and a cutting step S6. The preparation step, the arrangement step S1, the primary welding step S2, the pulling out step S3, the depressurization step S4, the secondary welding step S5, and the cutting step S6 are performed in this order.

[0024] (1.1) Energy storage device The electricity storage device 1 is a rectangular parallelepiped object, as shown in Fig. 1. The electricity storage device 1 includes a battery 10, an exterior body 20, and a pair of resin parts 30.

[0025] In the embodiment, the short-side direction of the main surface of the energy storage device 1 is defined as the X-axis direction. The long-side direction of the main surface of the energy storage device 1 is defined as the Y-axis direction. The thickness direction of the energy storage device 1 is defined as the Z-axis direction. The X-axis, Y-axis, and Z-axis are mutually perpendicular. The negative Z-axis direction and the direction of gravity are parallel. Note that these directions do not limit the orientation of the energy storage device of the present disclosure during use.

[0026] The battery 10 is sandwiched between a pair of resin parts 30 in the longitudinal direction (Y-axis direction) of the electricity storage device 1. The exterior body 20 houses the battery 10 and the pair of resin parts 30.

[0027] The length L1 (see FIG. 1) of the power storage device 1 in the X-axis direction and the length L2 (see FIG. 1) in the Y-axis direction may each be greater than 1 m.

[0028] (1.1.1)Battery The battery 10 is a rectangular parallelepiped as shown in Fig. 2. The battery 10 has an electrode laminate 11, a resin body 12, and a non-aqueous electrolyte (not shown) as shown in Fig. 3. The resin body 12 covers the side surfaces of the electrode laminate 11.

[0029] The electrode laminate 11 includes a plurality of bipolar electrodes 111 laminated via separators 112 along the Z-axis direction (lamination direction). In detail, the electrode laminate 11 has a plurality of bipolar electrodes 111, a plurality of separators 112, a positive terminal electrode 113, and a negative terminal electrode 114. The plurality of bipolar electrodes 111 and the plurality of separators 112 are laminated alternately along the Z-axis direction. The positive terminal electrode 113 is laminated via the separator 112 on the bipolar electrode 111 located furthest on one side of the lamination direction (the positive side in the Z-axis direction) among the plurality of bipolar electrodes 111. The negative terminal electrode 114 is laminated via the separator 112 on the bipolar electrode 111 located furthest on the other side of the lamination direction (the negative side in the Z-axis direction) among the plurality of bipolar electrodes 111.

[0030] (1.1.1.1) Bipolar electrodes The bipolar electrode 111 has a current collecting foil 1110, a positive electrode composite layer 1111, and a negative electrode composite layer 1112. The peripheral edge of the current collecting foil 1110 is heat welded to the resin body 12. The positive electrode composite layer 1111 is formed on a first main surface S1110A of the current collecting foil 1110. The negative electrode composite layer 1112 is formed on a second main surface S1110B of the current collecting foil 1110. The bipolar electrode 111 may have a known configuration.

[0031] The current collector foil 1110 supplies current to the positive electrode mixture layer 1111 and the negative electrode mixture layer 1112 during charging or discharging of the electricity storage device 1.

[0032] The positive electrode mixture layer 1111 includes a positive electrode active material capable of absorbing and releasing charge carriers (e.g., a lithium composite metal oxide having a layered rock salt structure, a metal oxide having a spinel structure, a polyanion-based compound, etc.). The positive electrode mixture layer 1111 may further include, as necessary, a conductive assistant (e.g., carbon nanofiber, etc.) for increasing electronic conductivity, a binder (e.g., polyvinylidene fluoride, etc.), an electrolyte supporting salt (lithium salt) for increasing ionic conductivity, a polymer electrolyte, and an additive (e.g., trifluoropropylene carbonate, a filler as a reinforcing material, etc.).

[0033] The negative electrode mixture layer 1112 includes a negative electrode active material capable of absorbing and releasing charge carriers (e.g., carbon (e.g., natural graphite, artificial graphite), a compound capable of being alloyed with lithium (e.g., silicon, tin, etc.), etc.). The negative electrode mixture layer 1112 may further include, as necessary, a conductive assistant (e.g., acetylene black, etc.) for enhancing electronic conductivity, a binder (e.g., polyvinylidene fluoride, etc.), an electrolyte supporting salt (lithium salt) for enhancing ionic conductivity, a polymer electrolyte, an additive (e.g., trifluoropropylene carbonate, a filler as a reinforcing material, etc.).

[0034] (1.1.1.2) Separators The separator 112 maintains a gap between the positive electrode mixture layer 1111 and the negative electrode mixture layer 1112 to prevent contact short circuit, and allows charge carriers such as lithium ions (e.g., lithium ions) to pass through. Examples of the separator 112 include a porous resin sheet or a nonwoven fabric. Examples of the material for the porous resin sheet include polyolefin (polypropylene, polyethylene, etc.). Examples of the material for the nonwoven fabric include polypropylene, polyethylene terephthalate, methyl cellulose, etc. The separator 112 may have a known configuration.

[0035] (1.1.1.3) Positive terminal electrode The positive terminal electrode 113 has a current collector foil 1110 and a positive electrode mixture layer 1111. The positive electrode mixture layer 1111 is formed on a second main surface S1110B of the current collector foil 1110. The positive terminal electrode 113 may have a known configuration.

[0036] (1.1.1.4) Negative terminal electrode The negative terminal electrode 114 has a current collector foil 1110 and a negative electrode mixture layer 1112. The negative electrode mixture layer 1112 is formed on a first main surface S1110A of the current collector foil 1110. The negative terminal electrode 114 may have a known configuration.

[0037] (1.1.1.5) Resin body The resin body 12 forms an accommodation space R10 between adjacent bipolar electrodes 111 among the plurality of bipolar electrodes 111. The resin body 12 has a portion that communicates the accommodation space R10 with an insertion path P described below, and seals the accommodation space R10. Examples of materials for the resin body 12 include polyethylene, polystyrene, acrylonitrile-butadiene-styrene copolymer synthetic resin (ABS resin), modified polypropylene, acrylonitrile-styrene resin, etc.

[0038] (1.1.1.6) Non-aqueous electrolyte The nonaqueous electrolyte is contained in the containing space R10. The nonaqueous electrolyte may include a nonaqueous solvent and a lithium salt. Examples of the lithium salt include LiClO4, LiAsF6, LiPF6, LiBF4, LiCF3SO3, LiN(FSO2)2, and LiN(CF3SO2)2. Examples of the nonaqueous solvent include cyclic carbonates, cyclic esters, chain carbonates, chain esters, and ethers. The nonaqueous electrolyte may include an additive (e.g., lithium bis(oxalato)borate, etc.).

[0039] (1.1.2) Exterior Body In this embodiment, the exterior body 20 is composed of two laminate sheets 21. The exterior body 20 has an accommodation area R20A and a sealed area R20B. The accommodation area R20A accommodates the battery 10, a non-aqueous electrolyte, and a pair of resin parts 30. The sealed area R20B is formed by welding the ends R21 of the laminate sheets 21 together (i.e., the peripheral edges of the laminate sheets 21 together). When viewed from the Z-axis direction, the sealed area R20B surrounds the periphery of the accommodation area R20A.

[0040] The laminate sheet 21 has an inner resin layer 211, a metal layer 212, and an outer insulating layer 213. The inner resin layer 211, the metal layer 212, and the outer insulating layer 213 are laminated in this order.

[0041] The inner resin layer 211 electrically insulates the battery 10 from the metal layer 212. The inner resin layer 211 includes a first resin. Examples of the first resin include olefin-based resins (e.g., polypropylene (PP), polyethylene (PE), etc.).

[0042] The metal layer 212 blocks the passage of gas (for example, moisture, air, etc.) between the outside and the inside of the power storage device 1. Examples of materials for the metal layer 212 include aluminum, aluminum alloys, and stainless steel.

[0043] The outer insulating layer 213 functions as a protective layer for the metal layer 212. The outer insulating layer 213 includes a second resin. Examples of the second resin include polyethylene terephthalate (PET) and nylon.

[0044] (1.1.3) Plastic parts The resin part 30 covers the side surface of the battery 10 in the longitudinal direction (Y-axis direction). The resin part 30 is a plate-like object. The resin part 30 has a recessed surface S30. The recessed surface S30 has a through hole TH30. The through hole TH30 communicates the interior of the storage area R20A with the insertion path P. The insertion path P is used to connect the decompression tube 51 to the interior of the storage area R20A. Details of the insertion path P will be described later with reference to FIG. 5. The resin part 30 includes a third resin. The third resin may be a known resin (e.g., polyimide) that has heat resistance and is not deformed by carrying out the primary welding process and the secondary welding process.

[0045] (1.2) Preparation process In the preparation step, there are prepared a battery 10, two laminate sheets 21, a pressure reducing tube connecting part 40 (an example of a part), and a pair of resin parts 30. The preparation method is not particularly limited and may be any known method.

[0046] 4, the decompression tube connecting part 40 has an insertion path forming part 41 and a tubular part 42. The insertion path forming part 41 is inserted into a hollow part TH42 of the tubular part 42. The tubular part 42 is displaceable relative to the insertion path forming part 41 along the longitudinal direction (Y-axis direction) of the insertion path forming part 41.

[0047] The insertion path forming part 41 is used to form an insertion path P in the seal area R20B. In this embodiment, the insertion path forming part 41 is a resin rod (e.g., a square plate-like object, etc.). The resin rod contains a fourth resin. The melting point of the fourth resin is higher than the melting point of the resin of the inner resin layer 211 of the laminate sheet 21. The fourth resin is, for example, a heat-resistant resin (e.g., polyimide, etc.).

[0048] The tubular part 42 is used to guide the decompression tube into the insertion path P. The tubular part 42 has a pair of metal walls 421 facing each other and a pair of resin walls 422 facing each other. The resin walls 422 contain a fifth resin. In this embodiment, the first resin contained in the inner resin layer 211 of the laminate sheet 21 and the fifth resin contained in the resin walls 422 are the same type.

[0049] (1.3) Placement process 5, in the arrangement step S1, a pair of resin parts 30 are arranged on both sides of the battery 10 in the longitudinal direction (Y-axis direction), and the battery 10 and the pair of resin parts 30 are covered with two laminate sheets 21. A pressure reducing tube connecting part 40 is sandwiched between end portions R21 of the two laminate sheets 21. The arrangement method and covering method are not particularly limited and may be any known method.

[0050] (1.4) Primary welding process 5, in the primary welding step S2, ends R21 of the laminate sheet 21 are overlapped and welded to each other via the decompression tube connection part 40 to form a primary seal area R20B1 that sandwiches the storage area R20A and the decompression tube connection part 40. In this embodiment, the resin wall 422 of the tubular part 42 is welded to the laminate sheet 21 in the primary seal area R20B1.

[0051] The welding method is not particularly limited, and may be, for example, a method in which the end portion R21 of the laminate sheet 21 is sandwiched between a pair of heated heat bars.

[0052] In this embodiment, when the tubular part 42 is viewed in the direction in which the hollow part TH42 of the tubular part 42 extends (Y-axis direction), the tubular part 42 is arranged so that the direction in which the ends R21 of the laminate sheet 21 face each other (Z-axis direction) is perpendicular to the direction in which the pair of metal walls 421 face each other (X-axis direction). In the primary welding step, when the ends R21 are sandwiched between a pair of heated heat bars, the pair of metal walls 421 of the tubular part 42 make it difficult for the hollow part TH42 of the tubular part 42 to be crushed. As a result, the manufacturing method for the electricity storage device of this embodiment can connect the decompression tube 51 and the storage site R20A more smoothly than a configuration in which the tubular part 42 does not have a pair of metal walls 421.

[0053] (1.5) Drawing process 5, in the pulling-out process S3, the insertion path forming part 41 is pulled out from the primary seal part R20B1 that sandwiches the decompression tube connecting part 40, to form an insertion path P in the primary seal part R20B1. The pulling-out method is not particularly limited and may be any known method.

[0054] (1.6) Decompression process In the depressurization step S4, as shown in Fig. 5, a depressurization tube 51 of a suction-type depressurization device 50 is inserted into the insertion path P via the cylindrical part 42 to depressurize the storage part R20A. In this embodiment, the tip of the depressurization tube 51 is inserted into the through hole TH30 of the resin part 30. The depressurization device 50 has the depressurization tube 51 and a vacuum pump 52 connected to the depressurization tube 51. In this embodiment, the vacuum pump 52 is driven to suck air from the tip of the depressurization tube 51 in the storage part R20A. The material of the depressurization tube 51 may be metal or resin.

[0055] (1.7) Secondary welding process In the secondary welding step S5, as shown in Fig. 6, the portion of the primary seal area R20B1 that forms the insertion path P is welded and sealed to form the seal area R20B. The welding method is not particularly limited, and may be the same as the welding method exemplified in the primary welding step S2. The portion that forms the insertion path P may be welded while the decompression tube 51 is pulled out of the insertion path P.

[0056] (1.8) Cutting process In the cutting process S6, the portion R42 of the sealed region R20B that sandwiches the tubular part 42 is cut to separate the tubular part 42 from the sealed region R20B. This results in obtaining the electricity storage device 1. The cutting method is not particularly limited and may be any known method.

[0057] (1.9) Effects 1 to 6, the method for manufacturing an electricity storage device according to the present embodiment is a method for manufacturing an electricity storage device 1. The manufacturing method includes a preparation step, a primary welding step S2, a pulling-out step S3, a depressurization step S4, and a secondary welding step S5. As a result, the manufacturing method for the energy storage device of this embodiment can manufacture the energy storage device 1 by removing the air between the battery 10 and the exterior body 20 (i.e., the air in the storage area R20A) using a suction-type pressure reduction device 50.

[0058] 1 to 6, the electricity storage device 1 further includes a resin part 30. In a depressurization step S4, the tip of the depressurization tube 51 is inserted into the through hole TH30 to depressurize the interior of the accommodation site R20A. As a result, in the depressurization step S4, the tip of the depressurization tube 51 is less likely to become blocked than in a configuration in which the electricity storage device 1 does not include the resin part 30. As a result, the manufacturing method for the electricity storage device of the present embodiment can efficiently remove air between the battery 10 and the exterior body 20 (i.e., air in the accommodation portion R20A).

[0059] As described with reference to Figs. 1 to 6, the decompression tube connecting part 40 further has a tubular part 42. The tubular part 42 has a resin wall 422. At the primary seal site R20B1, the resin wall 422 is welded to the laminate sheet 21. In the decompression step S4, the decompression tube 51 is inserted into the insertion path P via the tubular part 42. As a result, the manufacturing method for the energy storage device of this embodiment makes it easier to connect the pressure reduction tube 51 to the space between the battery and the outer casing (i.e., the storage portion R20A) than a configuration in which the pressure reduction tube connection part 40 does not have a tubular part 42.

[0060] As described with reference to FIGS. 1 to 6, the resin contained in the inner resin layer 211 of the laminate sheet 21 and the resin contained in the resin wall 422 of the tubular part 42 are of the same type. This ensures that the inner resin layer 211 and the resin wall 422 are welded together more reliably than in a configuration in which the resin contained in the inner resin layer 211 and the resin contained in the resin wall 422 are not the same type. This allows the manufacturing method for the electricity storage device of the present embodiment to more reliably connect the decompression tube 51 and the accommodation portion R20A.

[0061] As described with reference to FIGS. 1 to 6, the melting point of the resin contained in the insertion path forming part 41 (resin rod) is higher than the melting point of the resin contained in the inner resin layer 211 of the laminate sheet 21. This makes it difficult for the insertion path forming part 41 (resin rod) to be welded to the laminate sheet 21 by carrying out the primary welding step S2. Therefore, in the pulling-out step S3, the insertion path forming part 41 (resin rod) can be more easily pulled out from the primary seal part R20B1 that sandwiches the decompression tube connecting part 40. As a result, the manufacturing method for the electricity storage device of this embodiment can efficiently remove the air in the accommodation part R20A using the decompression device 50 of the suction type, thereby manufacturing the electricity storage device 1.

[0062] (2) Variations In the present embodiment, the power storage device 1 includes the resin part 30, but the present disclosure is not limited to this.

[0063] In the present embodiment, the vacuum tube connecting part 40 has the tubular part 42, but the present disclosure is not limited thereto. In the present disclosure, the vacuum tube connecting part 40 does not have to have the tubular part 42.

[0064] In this embodiment, the insertion path forming part 41 is a resin rod, but the present disclosure is not limited to this. In the present disclosure, the insertion path forming part 41 may be a metal that is not welded to the laminate sheet 21 by performing the primary welding step S2.

[0065] In this embodiment, the battery 10 includes a bipolar electrode assembly, although the present disclosure is not limited in this respect. The battery 10 may also include a monopolar electrode assembly.

[0066] Although the method for producing an electricity storage device according to the present embodiment includes the cutting step S6, the present disclosure is not limited thereto. The method for producing an electricity storage device according to the present disclosure does not necessarily have to include the cutting step S6.

[0067] In this embodiment, the first resin contained in the inner resin layer 211 and the fifth resin contained in the resin wall 422 are the same type, but the present disclosure is not limited to this. In the present disclosure, the first resin contained in the inner resin layer 211 and the fifth resin contained in the resin wall 422 do not have to be the same type. [Explanation of symbols]

[0068] 1: power storage device, 10: battery, 11: electrode laminate, 12: resin body, 20: exterior body, 21: laminate sheet, 30: resin part, 40: part (part) for connecting a pressure reducing tube, 41: part forming an insertion path, 42: cylindrical part, 50: pressure reducing device, 51: pressure reducing tube, 52: vacuum pump, P: insertion path, R10: storage space, R20A: storage part, R20B: sealing part, R20B1: primary sealing part, R21: end, TH30: through hole, TH42: hollow part

Claims

1. A method for manufacturing an electricity storage device, comprising the steps of: The power storage device includes a battery and an exterior body formed of a laminate sheet, the exterior body has a housing portion that houses the battery and a sealing portion formed by welding ends of the laminate sheet to each other, preparing the battery, the laminate sheet, and a component including an insertion path forming component that forms an insertion path for connecting a decompression tube to the storage portion; overlapping and welding the ends of the laminate sheet together via the component to form the storage area and a primary seal area sandwiching the component; Pulling out the insertion path forming component from the primary seal portion sandwiching the component to form the insertion path in the primary seal portion; inserting the decompression tube into the insertion path to decompress the interior of the accommodation portion; a portion of the primary seal portion that forms the insertion path is welded and sealed to form the seal portion; The manufacturing method of the electricity storage device includes the steps of:

2. the power storage device further includes a resin part having a through hole communicating between the housing portion and the insertion path, The resin part is accommodated in the accommodation portion, The method for manufacturing an electricity storage device according to claim 1 , wherein in the reducing the pressure, a tip of the pressure reducing tube is inserted into the through hole to reduce the pressure inside the accommodation portion.

3. The part further includes a tubular part into which the insertion path forming part is inserted, for guiding the decompression tube into the insertion path, the tubular part has a resin wall, The resin wall is welded to the laminate sheet at the primary seal portion, The method for manufacturing an electricity storage device according to claim 2 , wherein, in the reducing pressure, the pressure reducing tube is inserted into the insertion path via the tubular part.

4. the laminate sheet has a resin layer disposed on the battery side, The method for producing an electricity storage device according to claim 3 , wherein the resin contained in the resin layer and the resin contained in the resin wall are of the same kind.

5. the laminate sheet has a resin layer disposed on the battery side, The insertion path forming component is a resin rod, The method for producing an electricity storage device according to claim 1, wherein a melting point of the resin contained in the resin rod is higher than a melting point of the resin contained in the resin layer.

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