Manufacturing method for energy storage modules

Abstract

The present invention provides a method for manufacturing an energy storage module that can reduce material loss in the resin frame formed around the periphery of the current collector. [Solution] The method for manufacturing an energy storage module according to the present disclosure comprises a resin frame forming step of applying an annular resin frame to the peripheral portion of a bipolar electrode 1 where electrode composite layers 12 and 13 are not formed; a stacking step of stacking a plurality of bipolar electrodes 1 with resin frames formed thereon to form an electrode stack 20; and a welding step of welding adjacent bipolar electrodes together using the resin frame. The welding step includes welding a block-shaped resin member 43 to the side surface of the electrode stack 20. A metal layer 6 is formed on a surface of the resin member 43 that is different from the surface facing the side surface of the electrode stack 20.

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a power storage module.

Background Art

[0002] There is known a bipolar battery having a plurality of bipolar electrodes in which a positive electrode is provided on one surface of a current collector and a negative electrode is provided on the other surface of the current collector. A resin frame for sealing between adjacent electrodes in the stacking direction is attached to the edge of each electrode. The plurality of electrodes are overlapped with each other via a separator to form an electrode unit.

[0003] Patent Document 1 discloses a method for manufacturing an electrode unit of a bipolar battery. In Patent Document 1, a resin film is fed out from a roll of a strip-shaped resin film, and through-holes are formed in continuous regions by punching, thereby forming a resin film in which a plurality of rectangular ring-shaped resin frames are connected. With the resin frame being conveyed in the form of a resin film, a bipolar electrode is overlapped on the resin frame, and the current collector of the resin frame and the bipolar electrode that overlap each other are joined.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In Patent Document 1, with respect to a roll of a resin film, through-holes are formed in continuous regions by punching to form a resin frame. In the width direction of the resin film, the outer width of the resin frame is about 1 m, whereas the line width of the resin frame may be about 30 mm. In this case, most of the resin film becomes waste, which may lead to an increase in cost.

[0006] This disclosure has been made in view of the above problems, and aims to provide a method for manufacturing an energy storage module that can reduce material loss in the resin frame formed on the periphery of the current collector. [Means for solving the problem]

[0007] The method for manufacturing an energy storage module according to this disclosure comprises: a resin frame forming step of applying an annular resin frame to the peripheral portion of a bipolar electrode where an electrode composite layer is not formed; a lamination step of stacking a plurality of the bipolar electrodes on which the resin frames are formed to form an electrode laminate; and a welding step of welding adjacent bipolar electrodes using the resin frame. [Effects of the Invention]

[0008] According to this disclosure, it is possible to reduce material loss in the resin frame formed on the periphery of the current collector. [Brief explanation of the drawing]

[0009] [Figure 1] This figure shows a cross-section of a bipolar battery according to an embodiment. [Figure 2] This is a flowchart illustrating the manufacturing method of a bipolar battery according to an embodiment. [Figure 3] This is a diagram illustrating the resin frame formation process. [Figure 4] This is a top view of a current collector sheet, which has resin frames formed on both sides. [Figure 5] Figure 5 is a cross-sectional view of the VV section of Figure 4. [Figure 6] Figure 6 is a cross-sectional view taken along the line VI-VI in Figure 4. [Modes for carrying out the invention]

[0010] Embodiments of this disclosure will be described below with reference to the drawings. For clarity of explanation, the following descriptions and drawings have been omitted and simplified as appropriate. In addition, the same elements are denoted by the same reference numerals in each drawing, and redundant explanations have been omitted where necessary.

[0011] The embodiment relates to a bipolar secondary battery (energy storage module) that is installed as a battery in various vehicles, such as hybrid vehicles and electric vehicles. The bipolar battery according to the embodiment is a secondary battery such as a lithium-ion secondary battery or a nickel-metal hydride secondary battery. This disclosure can also be applied to energy storage modules such as electric double-layer capacitors. In the following description, a lithium-ion secondary battery will be used as an example.

[0012] Figure 1 is a diagram showing a cross-section of a bipolar battery according to an embodiment. The bipolar battery 10 comprises an electrode stack 20 in which positive and negative electrodes are alternately stacked while being insulated from each other. The electrode stack 20 has a plurality of bipolar electrodes 1, a plurality of separators 2, and a pair of outermost current collectors 3. The plurality of bipolar electrodes 1 are stacked on top of each other. Note that the number of bipolar electrodes 1 shown in Figure 1 is an example and is not limited thereto. The electrode stack 20 has a rectangular shape when viewed from the stacking direction of the plurality of bipolar electrodes 1. Separators 2 are arranged between adjacent bipolar electrodes 1.

[0013] Each bipolar electrode 1 has a current collector 11, a positive electrode 12, and a negative electrode 13. The current collector 11 is made of a metal material such as aluminum foil. The current collector 11 is rectangular in shape when viewed from above. The positive electrode 12 is provided on one side of the current collector 11. The positive electrode 12 is formed by coating one side of the current collector 11 with a positive electrode active material. Examples of positive electrode active materials include lithium-containing metal oxides and lithium-containing phosphates. Examples of lithium-containing metal oxides include Li(NiCoMn)O2 and Li(NiCoAl)O2. Examples of lithium-containing phosphates include LiFePO4.

[0014] The negative electrode 13 is provided on the other side of the current collector 11. The negative electrode 13 is formed by coating the other side of the current collector with a negative electrode active material. Examples of negative electrode active materials include carbon-based negative electrode active materials such as graphite, easily graphitizable carbon, and difficult-to-graphitize carbon, as well as alloy-based negative electrode active materials containing silicon (Si), tin (Sn), etc. The region where the negative electrode 13 is formed on the current collector 11 may be slightly larger than the region where the positive electrode 12 is formed. The peripheral edge of the current collector 11 is an uncoated region where neither the positive electrode active material nor the negative electrode active material is coated. In the uncoated region, the current collector is exposed. Hereinafter, the positive electrode 12 and the negative electrode 13 will be collectively referred to as the electrode composite layer.

[0015] The separator 2 is positioned between the positive electrode 12 and the negative electrode 13 of the adjacent bipolar electrode 1. The separator 2 allows ions to pass through while insulating the positive electrode 12 and the negative electrode 13 from direct contact. The separator 2 has a rectangular shape. The separator 2 is formed, for example, in the form of a sheet. The separator 2 is made of a porous film made of polyolefin resin such as polyethylene (PE) or polypropylene (PP), or a nonwoven or woven fabric made of PE, PP, polyethylene terephthalate (PET), or methylcellulose. Note that the separator 2 may be smaller than the current collector 11 and larger than the positive electrode 12 and the negative electrode 13 when viewed from the stacking direction.

[0016] A pair of outermost current collectors 3 are positioned on the outside of the stacking direction of the multiple bipolar electrodes 1. A positive electrode 31 is formed on one of the outermost current collectors 3. This outermost current collector 3 corresponds to the positive terminal electrode. The positive electrode 31 of the positive terminal electrode faces the negative electrode 13 of the adjacent bipolar electrode 1 via a separator 2. A negative electrode 32 is formed on the other outermost current collector 3. This other outermost current collector 3 corresponds to the negative terminal electrode. The negative electrode 32 of the negative terminal electrode faces the positive electrode 12 of the adjacent bipolar electrode 1 via a separator 2. The peripheral edges of the pair of outermost current collectors 3 are uncoated regions where the positive and negative electrode active materials are not applied. In the uncoated regions, the current collectors are exposed.

[0017] A pair of adjacent current collectors 11, a positive electrode 12, a separator 2, and a negative electrode 13 disposed between the pair of current collectors 11 constitute one cell. That is, the electrode laminate 20 includes a plurality of cells stacked on top of each other. Among the plurality of cells, the current collector outside the cell disposed on the outermost side becomes the outermost current collector 3. That is, in the bipolar battery 10, each bipolar electrode 1 serves as both the positive electrode and the negative electrode of adjacent cells, and the plurality of cells are connected in series.

[0018] External current collectors 5 can be provided on the outside of the pair of outermost current collectors 3 via a conductive adhesive, respectively. A positive electrode terminal (not shown) is connected to one of the external current collectors 5. A negative electrode terminal (not shown) is connected to the other external current collector 5. The bipolar battery has a structure in which current is taken out from the electrode laminate via the external current collectors by the positive electrode terminal and the negative electrode terminal. The external current collector 5 is, for example, a metal sheet. As the external current collector 5, for example, a conductive metal such as stainless steel, iron, copper, aluminum, titanium, nickel, etc. is adopted. The material of the external current collector 5 is not particularly limited, and a metal according to the purpose can be appropriately adopted.

[0019] The bipolar battery 10 includes a cylindrical sealing member 4 that extends in the stacking direction of the bipolar electrodes 1 and houses the electrode laminate 20. The sealing member 4 regulates the movement of gas and electrolyte between the cells. Thereby, insulation between adjacent cells is ensured.

[0020] The sealing member 4 is made of a resin material such as, for example, polypropylene (PP), polyphenylene sulfide (PPS), or modified polyphenylene ether (modified PPE). The sealing member 4 holds the ends of the bipolar electrode 1, the separator 2, and the outermost current collector 3. The uncoated region where the current collector of the bipolar electrode 1 is exposed is buried and held by the sealing member 4. That is, the sealing member 4 is configured to surround the electrode laminate 20. The sealing member 4 has, for example, a rectangular shape when viewed from the stacking direction side of the bipolar electrode 1. That is, the sealing member 4 is, for example, a square tube.

[0021] The sealing member 4 includes two resin frames and a resin block. In FIG. 1, for the purpose of explanation, a state where the two resin frames and the resin block are separated is shown. The two resin frames and the resin block are welded after the bipolar electrodes 1 are laminated. The two resin frames are the first sealing material 41 and the second sealing material 42.

[0022] The first sealing material 41 is provided at the peripheral portion where no electrode composite layer is formed on one surface of the current collector 11. The first sealing material 41 is a rectangular annular resin frame formed so as to surround the electrode composite layer. The first sealing material 41 is provided on the lower side of the peripheral portion of the current collector 11 over the entire circumference of the peripheral portion. The first sealing material 41 is joined to the current collector 11 of the bipolar electrode 1.

[0023] The second sealing material 42 is provided at the peripheral portion where no electrode composite layer is formed on the other surface of the current collector 11. The second sealing material 42 is a rectangular annular resin frame formed so as to surround the electrode composite layer. The second sealing material 42 is provided on the upper side of the peripheral portion of the current collector 11 over the entire circumference of the peripheral portion. The second sealing material 42 is joined to the peripheral portion of the current collector 11 of the bipolar electrode 1.

[0024] The first sealing material 41 and the second sealing material 42 are provided so as to overlap with each other with the current collector 11 interposed therebetween when viewed from the lamination direction side. The sealing member 4 includes a plurality of first sealing materials 41 and a plurality of second sealing materials 42 that are alternately arranged.

[0025] The separator 2 is disposed between the first sealing material 41 and the second sealing material 42 of adjacent bipolar electrodes 1. The peripheral portion of the separator 2 is joined to the first sealing material 41 and the second sealing material 42.

[0026] The resin block 43 is joined to the side surface of the electrode stack 20. The resin block 43 is a block-shaped resin member. Block-shaped means a mass of resin material having at least six faces, and may be, for example, a rectangular parallelepiped. The resin block 43 is placed, for example, on each side surface of the electrode stack 20. The resin block 43 may have a height H that is approximately equal to the thickness of the electrode stack 20. By welding the resin block 43 to the side surface of the electrode stack 20, the side surface of the electrode stack 20 is covered with resin material.

[0027] The sealing member 4 is constructed by joining a first sealing material 41 and a second sealing material 42, which are respectively placed between adjacent current collectors 11, with a resin block 43. The first sealing material 41, the second sealing material 42, and the resin block 43 surround the periphery of the current collector 11 and the periphery of the separator 2, thereby holding their peripheries in place.

[0028] The current collector 11 of the bipolar electrode 1 is joined to the first sealing material 41, the second sealing material 42, and the resin block 43 by, for example, thermal welding using a laser. The bipolar electrode 1, separator 2, first sealing material 41, second sealing material 42, and resin block 43 constitute the electrode unit.

[0029] Multiple bipolar electrodes 1 and a pair of outermost current collectors 3 are stacked via a first sealing material 41 and a second sealing material 42, and a resin block 43 is provided on the side surface of the electrode stack 20, so that the peripheral edge of each current collector is held embedded in the sealing member 4. As a result, an internal space is formed between adjacent current collectors 11 in the stacking direction, which is airtight and watertight due to the current collectors 11 and the sealing member 4.

[0030] The internal space contains an electrolyte solution containing lithium ions as carrier ions. As the electrolyte solution, for example, a solution of lithium salt dissolved at a predetermined concentration in a carbonate-based solvent can be used. Examples of carbonate-based solvents include fluoroethylene carbonate (FEC) and ethylene carbonate (EC). Examples of lithium salts include hexafluoride phosphate. The sealing member 4 is provided with an injection port (not shown). The injection port is used to inject the electrolyte solution into the internal space formed between adjacent current collectors 11. The injection port can also be used as a communication port for a pressure regulating valve that opens and closes according to the internal pressure within the sealing member 4. A pressure regulating unit may be provided in the communication port. The pressure regulating unit may assist or complement the function of the communication port as a pressure regulating valve.

[0031] A metal layer 6 is formed on the resin block 43 on a surface different from the surface facing the side of the electrode stack 20. The resin block 43 on which the metal layer 6 is formed is called a metal-integrated component. The metal-integrated component can be formed, for example, by attaching metal foil to each of the five surfaces of the resin block 43, excluding the surface facing the side of the electrode stack 20. As the metal foil, for example, aluminum foil, stainless steel foil, etc. may be used. Alternatively, the metal-integrated component may be formed by filling a rectangular box-shaped metal frame, with the surface facing the side of the electrode stack 20 open, with resin inside.

[0032] By heating and melting the resin block 43 of the metal-integrated component and pressing it against the side surface of the electrode laminate 20, the first sealing material 41 and the second sealing material 42 also melt. This causes the resin block 43, the first sealing material 41, and the second sealing material 42 to join together, forming the sealing member 4. Furthermore, the metal-integrated component can function as an outer covering that covers the side surface of the electrode laminate 20. This eliminates the need to cover the side surface of the electrode laminate 20 with a laminate film to form an outer covering. In addition, the welding quality of the outer covering can be improved by welding the metal foil or metal frame to the resin (resin block 43) beforehand.

[0033] Next, a method for manufacturing a bipolar battery will be described. Figure 2 is a flowchart illustrating a method for manufacturing a bipolar battery according to an embodiment. Positive electrodes 12 and negative electrodes 13 are intermittently coated onto the strip-shaped current collector sheet 110 in regions corresponding to individual bipolar electrodes 1. That is, multiple bipolar electrodes 1 are formed on the current collector sheet 110 in a continuous manner in the unwinding direction.

[0034] First, electrodes are unwound from the roll of current collector sheet 110 (S101). Then, a resin frame forming process is performed in which a resin frame 100, which will become the first sealing material 41, is formed on the peripheral edge of each bipolar electrode 1 where the electrode composite layer of the current collector 11 has not been formed (S102). Figure 3 is a diagram illustrating the resin frame forming process. Figure 3 shows the schematic configuration of the coating apparatus 200. The coating apparatus 200 is used when forming the resin frames 100, which will become the first sealing material 41 and the second sealing material 42. First, the process of forming a resin frame 100 in which multiple first sealing materials 41 are continuously arranged on one side of the current collector sheet 110 will be explained.

[0035] Here, width refers to the length of the resin frame 100 in the direction perpendicular to the transport direction, and height refers to the length of the resin frame 100 along the transport direction. Here, the length direction of the current collector sheet 110 on which the continuous resin frames 100 are formed is defined as the long side, and the width direction is defined as the short side.

[0036] The coating apparatus 200 includes a melting station (not shown) for storing molten resin material. The molten resin material is supplied to the first coating section 201. The first coating section 201 coats the resin material on, for example, a metal first roll 202, so as to form two parallel, continuous straight sections 101 spaced at a predetermined distance in the width direction of the first roll 202. The coating apparatus 200 may include a pump for adjusting the amount of resin material to be coated. The resin material is introduced between the first roll 202 and the second roll 203 and conveyed following the circumferential shape of the second roll 203. The first roll 202 and the second roll 203 cool the resin material while sandwiching it, forming a film-like resin.

[0037] Subsequently, the resin material is introduced between the second roll 203 and the third roll 204 and transported to the second coating section 205. Molten resin material is supplied to the second coating section 205. The second coating section 205 intermittently coats the resin material onto, for example, a metal third roll 204. This allows the second coating section 205 to form multiple connecting sections 102 that connect two straight sections 101 formed in the first coating section 201, spaced at predetermined intervals in the transport direction. In other words, the resin material is formed into a ladder-like structure with multiple resin frames 100 connected together.

[0038] The continuous resin frame 100 is conveyed to the fourth roll 206, where it is cooled and molded into a film-like resin. The fourth roll 206 directs the conveying direction of the continuous resin frame 100 to the same direction as the unwinding direction of the roll-shaped strip current collector sheet 110. The continuous resin frame 100 is positioned on top of the unwinded portion of the current collector sheet 110. The width of the resin frame 100 is approximately the same as the width of the current collector sheet 110. That is, the two straight sections 101 are positioned at both ends of the short side of the current collector sheet 110 so as to extend in the long side direction.

[0039] Although not shown in Figure 3, as described above, electrode composite layers are intermittently formed on the current collector sheet 110. The electrode composite layers are located within an opening 103 surrounded by a straight section 101 and a connecting section 102. The current collector sheet 110, on which the resin frame 100 that will become the first sealing material 41 is formed, is rolled again, and a resin frame that will become the second sealing material 42 is formed on the other side of the current collector sheet 110. The second sealing material 42 has the same configuration as the first sealing material 41 and can be formed by the method described above using Figure 3. Multiple second sealing materials 42 are formed as a continuous resin frame 100 on the current collector sheet 110.

[0040] The first sealing material 41 and the second sealing material 42 are arranged so that they overlap when viewed from above. For positioning the second sealing material 42 relative to the first sealing material 41, a known method using an imaging device, for example, can be used.

[0041] Figure 4 is a top view of a current collector sheet 110, in which resin frames 100 are formed on both sides of the current collector sheet 110. Figure 5 is a cross-sectional view of Figure 4 along VV. Figure 6 is a cross-sectional view of Figure 4 along VI-VI. As shown in Figures 4 and 5, the connecting portion 102 is arranged across the entire width of the current collector sheet 110 and is joined to the current collector sheet 110. As shown in Figures 4 and 6, a positive electrode 12 is formed on the lower surface of the current collector sheet 110. On the lower surface of the current collector sheet 110, a straight portion 101 (corresponding to the first sealing material 41) of one resin frame is formed at predetermined intervals in the width direction from the positive electrode 12. A negative electrode 13 is formed on the upper surface of the current collector sheet 110. On the upper surface of the current collector sheet 110, a straight portion 101 (corresponding to the second sealing material 42) of the other resin frame is formed at predetermined intervals in the width direction from the negative electrode 13.

[0042] Subsequently, the current collector sheet 110, on which resin frames 100 are formed on both sides, is cut into individual sheets (S103). Known cutters such as shear cutters or rotary cutters can be used to cut the current collector sheet 110. By unwinding the current collector sheet 110 and cutting it at a predetermined position, individual bipolar electrodes 1 are obtained. Then, multiple individual bipolar electrodes 1 with resin frames 100 formed on them are stacked (S104) to form an electrode stack 20. In the stacking process, multiple bipolar electrodes 1 are stacked such that the first sealing material 41 of one bipolar electrode 1 and the second sealing material 42 of the other bipolar electrode 1 face each other.

[0043] A separator is placed between the opposing first sealing material 41 and second sealing material 42. The separator 2 is obtained, for example, by cutting a roll of separator sheet into regions corresponding to individual separators 2. In this embodiment, the dimensions of the separator 2 are smaller than the outer dimensions of the resin frame 100 and larger than the dimensions of the opening 103. The separator 2 is positioned to close the opening 103. As a result, the first sealing material 41 and the second sealing material 42 of adjacent bipolar electrodes 1 overlap via the separator 2. At the stage when the bipolar electrodes 1 are stacked, there is no bonding between each bipolar electrode 1, nor between the bipolar electrodes 1 and the separator 2.

[0044] Then, the resin block 43 is welded to the stacked bipolar electrodes 1 (electrode stack 20) ​​(S105). The resin block 43 is prepared as part of a metal integrated component by a process of forming a metal layer on a surface of the resin block 43 that is different from the surface facing the side of the electrode stack 20. First, the resin block 43 of the metal integrated component is melted using a laser, a heat roller, a heat sealer, etc. Then, the molten resin block 43 is pressed against the side of the electrode stack 20 to melt the first seal material 41 and the second seal material 42. As a result, the first seal material 41, the second seal material 42 and the resin block 43 are joined together to form a sealing member 4. As a result, adjacent bipolar electrodes 1 are joined together via the first seal material 41 and the second seal material 42. In addition, the ends of the current collector 11, the separator 2 and the outermost current collector 3 are embedded in and held by the sealing member 4.

[0045] The integrated metal components are connected to each side of the rectangular electrode stack 20 when viewed from above. As a result, the resin block 43 is welded to the entire circumference of the sides of the electrode stack 20.

[0046] Furthermore, at least one of the resin frames 100 that form the first sealing material 41 and the second sealing material 42 may have a notch that serves as an electrolyte injection port. That is, the resin frame 100 is in a state where a part of the ladder-shaped resin material has been cut out. The notch penetrates the resin frame 100. By injecting electrolyte through the electrolyte injection port to seal the cell and connecting the positive and negative terminals via the external current collector 5, a bipolar battery 10 is obtained.

[0047] As described above, according to the embodiment, by directly coating a ladder-like resin material onto a strip-shaped current collector sheet to form a continuous resin frame, it is possible to reduce the loss of material used to form the resin frame provided on the periphery of the current collector. Furthermore, since the resin material is directly coated onto the current collector, the current collector and the resin frame are joined simply by coating the resin material. This eliminates the need for a separate joining process between the current collector and the resin frame, as well as any associated processes.

[0048] Furthermore, by joining a metal-integrated component, which integrates a resin block and a metal layer, to the side surface of the electrode stack 20, it becomes possible to efficiently realize the function of the outer casing without requiring a separate process of attaching a laminate film to form the outer casing. In addition, since the metal layer and the resin block are welded together in advance, the welding quality of the outer casing can be improved. This improves the quality stability of the bipolar battery, such as airtightness and dimensions. Moreover, by providing a notch in a part of the resin frame, the process of processing the liquid injection port can be reduced, making it possible to shorten the manufacturing time of the bipolar battery.

[0049] In the comparative example where strip-shaped resin material is joined together to form a resin frame, the excess resin at the overlapping portions interferes with the positive and negative electrode active materials. This necessitates reducing the size of the positive and negative electrode active materials, resulting in a decrease in energy density. Furthermore, variations in the thickness of the overlapping portions and the length of the excess resin increase the number of defects, requiring processes such as crushing the overlapping portions of the resin material or measuring the thickness, thus increasing manufacturing man-hours. Additionally, if the resin materials are butted together without overlapping, gaps form between the resin materials, leading to leakage.

[0050] In contrast, in this embodiment, since the sealing member 4 is formed by laminating a frame-shaped first sealing material 41 and a second sealing material 42 that do not have joints, there is no overflow of resin material, and it is possible to suppress a decrease in the energy density of the bipolar battery 10. In addition, since the process of crushing the overlapping parts of the resin material is eliminated, it is possible to reduce costs. Furthermore, quality defects such as leaks are less likely to occur, and the defect rate of the bipolar battery 10 can be reduced.

[0051] This disclosure is not limited to the embodiments described above, and may be modified as appropriate without departing from the spirit of the invention. [Explanation of symbols]

[0052] 1 Bipolar electrode 2 Separators 3. Outermost current collector 4 Sealing member 5. External current collector 6 metal layer 10 Bipolar batteries 11 Current collector 12 Positive electrode 13 Negative electrode 20 Electrode Stack 31 Positive electrode 32 Negative electrode 41. First sealing material 42. Second sealing material 43 Resin Blocks 100 resin frame 101 Straight section 102 Connection part 103 Opening 110 Current collector sheet 200 Coating equipment 201 1st Coating Section 202 Roll 1 203 Roll 2 204 Third Roll 205 Second Coating Section 206 4th Roll

Claims

1. A resin frame forming step involves applying an annular resin frame to the peripheral portion of a bipolar electrode where the electrode composite layer is not formed, A lamination step of stacking a plurality of bipolar electrodes, each having a resin frame formed on it, to form an electrode laminate, A welding step in which adjacent bipolar electrodes are welded together using the resin frame, Equipped with, A method for manufacturing energy storage modules.

2. The resin frame forming step is, A step of forming a plurality of ladder-like, continuous first resin frames along the length direction on one surface of the strip-shaped bipolar electrode, A step of forming a plurality of second resin frames in a ladder-like manner along the length direction on the other surface of the strip-shaped bipolar electrode, so as to overlap the first resin frame, The process of cutting the bipolar electrode into a single-sheet shape, including, A method for manufacturing an energy storage module according to claim 1.

3. The aforementioned lamination process is The process includes stacking a plurality of bipolar electrodes such that, among adjacent bipolar electrodes, the first resin frame of one bipolar electrode and the second resin frame of the other bipolar electrode face each other. A method for manufacturing an energy storage module according to claim 2.

4. The welding process described above is This includes a step of welding a block-shaped resin member to the side surface of the electrode stack. A method for manufacturing an energy storage module according to claim 1.

5. The process includes forming a metal layer on a surface of the resin member that is different from the surface facing the side of the electrode laminate, A method for manufacturing an energy storage module according to claim 4.

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