JP2019079614A - Power storage module, and method for manufacturing power storage module - Google Patents

Abstract

To provide a power storage module capable of preventing a short circuit while avoiding an increase in size, and a method for manufacturing the power storage module.SOLUTION: A power storage module 4 includes an electrode laminate 11 having a plurality of bipolar electrodes 14 and a plurality of separators 13, and a sealing body 12 provided on the electrode laminate 11 so as to surround an edge part 15c of the bipolar electrodes 14. The separators 13 are interposed between a positive electrode 16 and a negative electrode 17 of the mutually adjacent bipolar electrodes 14, and extend so as to overlap with the edge part 15c of the electrode plate 15. The sealing body 12 includes a plurality of first resin parts 21 which are welded to the edge part 15c in a state in which the separators 13 are interposed between the edge part 15c, and a second resin part 22 which surrounds the plurality of first resin parts 21 from the outside and is joined to the first resin part 21. The first resin part 21 is formed of an elastic material, and is held by the second resin part 22 in an elastically compressed state.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a storage module and a method of manufacturing the storage module.

  Patent Document 1 describes a bipolar plate type laminated battery. In this bipolar plate type laminated battery, a plurality of unit cells defined by a plurality of bipolar plates separated by a plurality of bipolar plates are clamped with bolts and nuts, with the space defined by the negative side current collector plate, the positive side current collector plate and the cell casing. It is obtained by

Patent No. 4570863

  In the above laminated battery, the positive electrode and the negative electrode are disposed on both sides of one bipolar plate. In addition, the bipolar plate extends outward beyond the positive electrode and the negative electrode and is sandwiched by the cell casing. On the other hand, the separator interposed between the positive electrode and the negative electrode is smaller than the bipolar plate, and does not reach the sandwiching portion of the bipolar plate in the cell casing.

  Therefore, in the above laminated battery, there is a possibility that a short circuit may occur in a part of the bipolar plate exposed from the separator when viewed in the laminating direction. On the other hand, it is conceivable to enlarge the separator and to hold it together with the bipolar plate by the cell casing, but in this case, the dimension in the lamination direction of the laminated battery becomes larger by the separator.

  Then, this invention aims at providing the electrical storage module which can prevent a short circuit while avoiding enlargement, and the manufacturing method of an electrical storage module.

  A storage module according to the present invention comprises a laminate having a plurality of bipolar electrodes stacked together in a first direction, and a plurality of separators disposed between adjacent bipolar electrodes in a first direction. And a sealing body provided in the laminate so as to surround the edge of the bipolar electrode, the bipolar electrode comprising an electrode plate, a positive electrode provided on a first surface of the electrode plate, and a first electrode plate The positive electrode and the negative electrode are alternately arranged along the first direction and stacked on one another, and the separators are arranged along the first direction. It is interposed between the positive electrode and the negative electrode of adjacent bipolar electrodes, and extends overlapping the edge of the electrode plate as viewed from the first direction, and the sealing body is laminated along the first direction In the state of interposing a separator between the edge of the electrode plate And a plurality of first sealing portions welded to the edge of the electrode plate, and a second sealing portion surrounding the plurality of first sealing portions from the outside and joined to the first sealing portion. The first sealing portion is made of an elastic material, and is held by the second sealing portion in a state of being elastically compressed along the first direction.

  Further, according to a method of manufacturing a storage module of the present invention, a plurality of bipolar electrodes stacked together in a first direction, and a plurality of separators disposed between bipolar electrodes adjacent in a first direction, And a sealing step of providing a sealing body on the laminate so as to surround the edge of the bipolar electrode, the bipolar electrode comprising: an electrode plate; The sealing body includes a plurality of first sealing portions made of an elastic material, and a second electrode including a positive electrode provided on the surface and a negative electrode provided on the second surface opposite to the first surface of the electrode plate A sealing portion, and the sealing step includes a primary sealing step of welding the first resin portion 21 to the edge of the electrode plate before the laminating step, and the laminating step is after the primary sealing step While interposing a separator extending overlapping with the edge of the electrode plate as viewed from the first direction, The bipolar electrodes are stacked on each other so that the positive electrode and the negative electrode are alternately arranged along one direction, and the sealing step is performed by separating the separator between the first sealing portion and the edge of the electrode plate after the stacking step. By providing a second sealing portion so as to surround the first sealing portion from the outside while elastically compressing the first sealing portion in the first direction in the state in which the second sealing portion is interposed. The secondary sealing process of holding a 1st sealing part by a sealing part is included.

  In the storage module and the method of manufacturing the storage module, the separator interposed between the positive electrode and the negative electrode overlaps the edge of the electrode plate of the bipolar electrode as viewed from the stacking direction (first direction). ing. Then, the first sealing portion made of an elastic material is welded to the edge of the electrode plate in a state in which the separator is interposed between the first sealing portion and the edge of the electrode plate, and elastically compressed along the stacking direction. It is held by the second sealing portion in the closed state. That is, the separator is held by the first sealing portion together with the electrode plate in the stacking direction at the edge of the electrode plate. Therefore, a short circuit can be prevented. At this time, the first sealing portion is compressed in the stacking direction. Therefore, enlargement in the stacking direction can be avoided.

  In the storage module according to the present invention, the separator may be in contact with the electrode plate in a state of being interposed between the first sealing portion and the electrode plate. In this case, a short circuit can be reliably prevented.

  In the storage module according to the present invention, the longitudinal elastic modulus of the first sealing portion may be smaller than the longitudinal elastic modulus of the separator. In this case, since the separator is not easily deformed when the first sealing portion is compressed, electrical insulation can be reliably ensured.

  In the storage module according to the present invention, the longitudinal elastic modulus of the first sealing portion may be smaller than the longitudinal elastic modulus of the second sealing portion. In this case, the first sealing portion can be reliably held in a state in which it is elastically deformed.

  According to the present invention, it is possible to provide a storage module capable of preventing a short circuit while avoiding an increase in size, and a method of manufacturing the storage module.

It is a schematic sectional drawing which shows one Embodiment of an electrical storage apparatus. It is a schematic sectional drawing which shows the internal structure of the electrical storage module shown by FIG. FIG. 3 is an enlarged view of a portion of the storage module shown in FIG. 2;

  Hereinafter, an embodiment of a storage module will be described with reference to the drawings. In the description of the drawings, the same elements or corresponding elements may be denoted by the same reference numerals, and redundant description may be omitted.

  FIG. 1 is a schematic cross-sectional view showing an embodiment of a power storage device. The storage device 1 shown in FIG. 1 is used, for example, as a battery of various vehicles such as a forklift, a hybrid car, and an electric car. The power storage device 1 includes a module stack 2 including a plurality of power storage modules 4 stacked on one another, and a constraining member 3 that applies a constraint load to the module stack 2 in the stacking direction.

  The module stack 2 includes a plurality of (here, three) storage modules 4 and a plurality of (here, four) conductive plates 5. The storage module 4 is a bipolar battery, and has a rectangular shape when viewed from the stacking direction. The storage module 4 is, for example, a nickel-hydrogen secondary battery, a secondary battery such as a lithium ion secondary battery, or an electric double layer capacitor. The following description exemplifies a nickel-hydrogen secondary battery.

  The storage modules 4 adjacent to each other in the stacking direction are electrically connected via the conductive plate 5. The conductive plates 5 are respectively disposed between the storage modules 4 adjacent to each other in the stacking direction and at the outside of the storage modules 4 located at the stacking end. The positive electrode terminal 6 is connected to one of the conductive plates 5 disposed on the outer side of the storage module 4 located at the lamination end. The negative electrode terminal 7 is connected to the other conductive plate 5 disposed outside the power storage module 4 located at the stacking end. The positive electrode terminal 6 and the negative electrode terminal 7 are drawn out, for example, from the edge of the conductive plate 5 in the direction crossing the stacking direction. Charging and discharging of the power storage device 1 are performed by the positive electrode terminal 6 and the negative electrode terminal 7.

  Inside the conductive plate 5, a plurality of flow paths 5a for circulating a refrigerant such as air are provided. The flow path 5 a extends, for example, along a direction intersecting (orthogonal to) the stacking direction and the drawing direction of the positive electrode terminal 6 and the negative electrode terminal 7. The conductive plate 5 has a function as a connecting member for electrically connecting the storage modules 4 to each other, and as a heat sink for radiating heat generated by the storage module 4 by circulating a refrigerant through the flow paths 5a. It also has a function. In the example of FIG. 1, although the area of the conductive plate 5 viewed from the stacking direction is smaller than the area of the storage module 4, the area of the conductive plate 5 is the area of the storage module 4 from the viewpoint of improving heat dissipation. And may be larger than the area of the storage module 4.

  The restraint member 3 is configured by a pair of end plates 8 sandwiching the module stack 2 in the stacking direction, and a fastening bolt 9 and a nut 10 fastening the end plates 8 to each other. The end plate 8 is a rectangular metal plate having an area slightly larger than the areas of the storage module 4 and the conductive plate 5 as viewed in the stacking direction. A film F having an electrical insulation property is provided on the inner side surface of the end plate 8 (the surface on the module stack 2 side). The film F insulates between the end plate 8 and the conductive plate 5.

  At the edge of the end plate 8, an insertion hole 8 a is provided at a position outside the module stack 2. The fastening bolt 9 is passed from the insertion hole 8a of one end plate 8 toward the insertion hole 8a of the other end plate 8, and the tip portion of the fastening bolt 9 protrudes from the insertion hole 8a of the other end plate 8 , The nut 10 is screwed. As a result, the storage module 4 and the conductive plate 5 are sandwiched by the end plates 8 to be unitized as the module stack 2, and a restraining load is applied to the module stack 2 in the stacking direction.

  Next, the configuration of the storage module 4 will be described in detail. FIG. 2 is a schematic cross-sectional view showing an internal configuration of the storage module shown in FIG. As shown in FIG. 2, the storage module 4 includes an electrode stack (stack) 11, and a resin sealing body 12 that seals the electrode stack 11. The electrode stack 11 includes a plurality of electrodes (a plurality of bipolar electrodes 14, a single negative electrode terminal electrode (electrode) 18) stacked one on another along a stacking direction D (first direction) via a plurality of separators 13. And a single positive electrode termination electrode 19). Here, the stacking direction D of the electrode stack 11 coincides with the stacking direction of the module stack 2. The electrode stack 11 has side surfaces 11 a extending in the stacking direction D.

  The bipolar electrode 14 includes an electrode plate 15, a positive electrode 16 provided on a first surface 15 a of the electrode plate 15, and a negative electrode 17 provided on a second surface 15 b opposite to the first surface 15 a of the electrode plate 15. The positive electrode 16 is a positive electrode active material layer formed by applying a positive electrode active material to the electrode plate 15. The negative electrode 17 is a negative electrode active material layer formed by applying a negative electrode active material to the electrode plate 15. In the electrode stack 11, the positive electrode 16 of one bipolar electrode 14 is opposed to the negative electrode 17 of another bipolar electrode 14 adjacent in the stacking direction D with the separator 13 interposed therebetween. In the electrode stack 11, the negative electrode 17 of one bipolar electrode 14 is opposed to the positive electrode 16 of another bipolar electrode 14 adjacent in the stacking direction D with the separator 13 interposed therebetween. That is, in the bipolar electrode 14, the positive electrode 16 and the negative electrode 17 are alternately arranged along the stacking direction D and stacked one on another.

  The negative electrode terminal electrode 18 includes an electrode plate 15 and a negative electrode 17 provided on the second surface 15 b of the electrode plate 15. The negative electrode terminal electrode 18 is disposed at one end in the stacking direction D such that the second surface 15 b is on the inner side (the center side in the stacking direction D) of the electrode stack 11. The negative electrode 17 of the negative electrode terminal electrode 18 is opposed to the positive electrode 16 of the bipolar electrode 14 at one end in the stacking direction D via the separator 13. The positive electrode terminal electrode 19 includes an electrode plate 15 and a positive electrode 16 provided on a first surface 15 a of the electrode plate 15. The positive electrode terminal electrode 19 is disposed at the other end in the stacking direction D such that the first surface 15 a thereof is inside the electrode stack 11. The positive electrode 16 of the positive electrode terminal electrode 19 is opposed to the negative electrode 17 of the bipolar electrode 14 at the other end in the stacking direction D via the separator 13.

  The conductive plate 5 is in contact with the first surface 15 a of the electrode plate 15 of the negative electrode terminal electrode 18. The other conductive plate 5 adjacent to the storage module 4 is in contact with the second surface 15 b of the electrode plate 15 of the positive electrode terminal electrode 19. The restraint load from the restraint member 3 is applied to the electrode stack 11 from the negative electrode termination electrode 18 and the positive electrode termination electrode 19 via the conductive plate 5.

  The electrode plate 15 is made of, for example, a metal such as a nickel or nickel plated steel plate. As an example, the electrode plate 15 is a rectangular metal foil made of nickel. An edge portion of the electrode plate 15 (edge portion of the bipolar electrode 14, the negative electrode termination electrode 18, and the positive electrode termination electrode 19) 15c has a rectangular frame shape, and a positive electrode active material and a negative electrode active material are not coated It has become. As a positive electrode active material which comprises the positive electrode 16, nickel hydroxide is mentioned, for example. As a negative electrode active material which comprises the negative electrode 17, a hydrogen storage alloy is mentioned, for example. In the present embodiment, the formation region of the negative electrode 17 on the second surface 15 b of the electrode plate 15 is one size larger than the formation region of the positive electrode 16 on the first surface 15 a of the electrode plate 15.

  The separator 13 is interposed at least between the positive electrode 16 and the negative electrode 17 of the bipolar electrode 14 adjacent to each other along the stacking direction D. Here, the separator 13 is disposed between the negative electrode 17 of the negative electrode terminal electrode 18 and the positive electrode 16 of the bipolar electrode 14 adjacent to the negative electrode terminal electrode 18, the positive electrode 16 of the positive electrode terminal electrode 19, and the positive electrode terminal electrode 19. It is also interposed between the negative electrode 17 of the bipolar electrode 14 adjacent to the.

  The separator 13 is formed in, for example, a sheet shape. Examples of the separator 13 include porous films made of polyolefin resins such as polyethylene (PE) and polypropylene (PP), and woven or non-woven fabrics made of polypropylene, polyethylene terephthalate (PET), methyl cellulose and the like. The separator 13 may be reinforced with a vinylidene fluoride resin compound. The separator 13 is not limited to a sheet but may be a bag.

  The sealing body 12 is formed in a rectangular tube shape as a whole by, for example, an insulating resin. The sealing body 12 is provided on the side surface 11 a of the electrode stack 11 so as to surround the edge 15 c. The sealing body 12 holds the edge 15 c at the side surface 11 a. The sealing body 12 surrounds a plurality of first resin portions (a plurality of first sealing portions) 21 welded to the edge portion 15c and the first resin portion 21 along the side surface 11a from the outside to form a first resin And a single second resin portion (second sealing portion) 22 joined to the portion 21.

  The first resin portion 21 has a rectangular annular shape when viewed in the stacking direction D, and is continuously provided over the entire circumference of the edge portion 15 c. The first resin portion 21 is welded and airtightly bonded to the first surface 15 a of the electrode plate 15. The first resin portion 21 is welded, for example, by ultrasonic waves or heat. The first resin portion 21 is a film having a predetermined thickness (length in the stacking direction D). The end face of the electrode plate 15 is exposed from the first resin portion 21. A part of the inside of the first resin portion 21 is located between the edge portions 15c of the electrode plates 15 adjacent to each other in the stacking direction D, and a part of the outside protrudes from the electrode plate 15 to the outside . The first resin portion 21 is embedded in the second resin portion 22 in a part of the outer side. The first resin portions 21 adjacent to each other along the stacking direction D are separated from each other.

  The second resin portion 22 is provided outside the electrode stack 11 and the first resin portion 21, and constitutes an outer wall (housing) of the storage module 4. The second resin portion 22 is formed, for example, by injection molding of a resin, and extends along the stacking direction D along the entire length of the electrode stack 11. The second resin portion 22 has a tubular (annular) shape extending with the stacking direction D as an axial direction. The second resin portion 22 is welded (joined) to the outer surface of the first resin portion 21 by, for example, heat at the time of injection molding.

  The second resin portion 22 is, together with the first resin portion 21, between the bipolar electrodes 14 adjacent to each other along the stacking direction D, between the negative electrode terminal electrode 18 and the bipolar electrode 14 adjacent to each other along the stacking direction D, And between the positive electrode terminal electrode 19 and the bipolar electrode 14 which mutually adjoin along the lamination direction D, it each seals. As a result, an airtightly partitioned internal space V is formed between the bipolar electrode 14, between the negative electrode termination electrode 18 and the bipolar electrode 14, and between the positive electrode termination electrode 19 and the bipolar electrode 14. There is. In the internal space V, for example, an electrolytic solution (not shown) made of an alkaline aqueous solution such as a potassium hydroxide aqueous solution is accommodated. The electrolytic solution is impregnated in the separator 13, the positive electrode 16 and the negative electrode 17.

  The second resin portion 22 is, for example, an insulating resin, and may be made of polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), or the like.

  FIG. 3 is an enlarged view of a portion of the storage module shown in FIG. As shown in FIGS. 2 and 3, the first resin portions 21 are stacked together along the stacking direction D. And, here, the separator 13 extends so as to reach the region between the electrode plate 15 and the first resin portion 21. That is, the separator 13 overlaps the edge 15 c of the electrode plate 15 when viewed in the stacking direction D and extends. In other words, the separator 13 has an edge 13c overlapping the edge 15c. The separator 13 is in contact with the edge 15 c of the electrode plate 15 at the edge 13 c. The first resin portion 21 excluding the outermost portion on the negative electrode terminal electrode 18 side has the edge portion 15 c of the electrode plate 15 in a state where the edge portion 13 c of the separator 13 is interposed between the first resin portion 21 and the edge portion 15 c of the electrode plate 15. It is welded to

  On the other hand, the first resin portion 21 is made of an elastic material. Specific materials of the first resin portion 21 include, for example, an elastomer, modified PPE, and acid-modified PP. The first resin portion 21 is welded and held by the second resin portion 22 in a state in which the first resin portion 21 is elastically compressed at least along the stacking direction D. Further, the longitudinal elastic modulus of the first resin portion 21 is smaller than the longitudinal elastic modulus of the separator 13. Therefore, the portion of the first resin portion 21 overlapping the edge 13 c of the separator 13 is recessed in accordance with the shape of the separator 13. Therefore, although both the first resin portion 21 and the separator 13 intervene between the edge portions 15c of the pair of electrode plates 15 adjacent to each other, the thickness of the separator 13 is the elasticity of the first resin portion 21. Covered by deformation, the overall thickness does not increase.

  The longitudinal modulus of elasticity of the first resin portion 21 is smaller than the longitudinal modulus of elasticity of the second resin portion 22. That is, the first resin portion 21 is configured to be most elastically deformed among resin members such as the separator 13 and the second resin portion 22.

  Subsequently, an example of a method of manufacturing power storage device 1 will be described. In this method, first, the above storage module 4 is manufactured. The method of manufacturing the storage module 4 includes a primary molding process (primary sealing process, sealing process), a lamination process, a secondary molding process (secondary sealing process, sealing process), and an injection process. . In the primary molding process, a predetermined number of bipolar electrodes 14, a negative electrode terminal electrode 18 and a positive electrode terminal electrode 19 are prepared, and the first resin portion 21 is welded to the first surface 15a of the edge 15c of each electrode plate 15.

  In the laminating step, the first resin portion 21 is disposed between the edge portions 15c of the electrode plate 15, and the separator 13 is interposed so as to overlap with the edge portion 15c of the electrode plate 15 viewed from the stacking direction D. Meanwhile, the electrode stack 11 is formed by laminating the bipolar electrode 14, the negative electrode termination electrode 18, and the positive electrode termination electrode 19 so that the positive electrodes 16 and the negative electrodes 17 are alternately arranged along the stacking direction D.

  In the secondary molding step, after disposing the electrode stack 11 in a mold (not shown) for injection molding, a compressive load is applied to at least the first resin portion 21, and the first resin along the stacking direction D In a state where the portion 21 is elastically compressed, the molten resin is injected into the mold. As a result, the second resin portion 22 is provided so as to surround the first resin portion 21, and the first resin portion 21 is held in a compressed state. Thereby, the sealing body 12 is formed on the side surface 11 a of the electrode stack 11. In the injection step, an electrolytic solution is injected into the internal space V of the bipolar electrode 14 after the secondary forming step. Thereby, the storage module 4 is obtained.

  Thereafter, the obtained power storage module 4 and the conductive plate 5 are stacked to form the module stack 2, and the power storage device 1 is manufactured through steps such as restraining the module stack 2 by the restraint member 3.

  As described above, in the storage module 4 and the method of manufacturing the storage module 4, the separator 13 interposed between the positive electrode 16 and the negative electrode 17 is the electrode plate 15 as viewed from the stacking direction (first direction) D. It extends overlapping the edge 15c. Then, the first resin portion 21 made of an elastic material is welded to the edge 15 c of the electrode plate 15 in a state in which the separator 13 is interposed between the first resin portion 21 and the edge 15 c of the electrode plate 15. It is held by the second resin portion 22 in a state of being elastically compressed. That is, the separator 13 is held by the first resin portion 21 together with the electrode plate 15 in the stacking direction D at the edge 15 c of the electrode plate 15. Therefore, a short circuit can be prevented. At this time, the first resin portion 21 is compressed in the stacking direction D. Therefore, the enlargement in the stacking direction D can be avoided.

  Further, in the storage module 4, the separator 13 is in contact with the electrode plate 15 in a state of being interposed between the first resin portion and the electrode plate 15. Therefore, a short circuit can be reliably prevented.

  Further, in the storage module 4, the longitudinal elastic modulus of the first resin portion 21 is smaller than the longitudinal elastic modulus of the separator. For this reason, since the separator 13 is not easily deformed when the first resin portion 21 is compressed (the crushing of the separator 13 is suppressed), it is possible to ensure electrical insulation.

  Furthermore, in the storage module 4, the longitudinal elastic modulus of the first resin portion 21 is smaller than the longitudinal elastic modulus of the second resin portion 22. Therefore, the second resin portion 22 can reliably hold the elastically deformed state of the first resin portion 21.

  The above embodiment describes one embodiment of the storage module according to the present invention. Therefore, the storage module according to the present invention is not limited to the storage module 4 described above, and the storage module 4 may be arbitrarily modified without departing from the scope of each claim.

  For example, in the storage module 4, the first resin portion 21 and the separator 13 may be welded to each other. This welding may be performed simultaneously with the welding of the first resin portion 21 and the electrode plate 15, for example. For welding in the present embodiment, for example, laser welding, heat welding, ultrasonic welding or the like can be used.

  DESCRIPTION OF SYMBOLS 4 ... Storage module, 11 ... Electrode laminated body (laminated body), 12 ... Sealed body, 15 ... Electrode plate, 15c ... Edge part, 16 ... Positive electrode, 17 ... Negative electrode, 21 ... 1st resin part (1st sealing) 22) second resin portion (second sealing portion) D: stacking direction (first direction).

Claims (5)

A laminate having a plurality of bipolar electrodes stacked together along a first direction, and a plurality of separators disposed between the adjacent bipolar electrodes along the first direction;
An encapsulant provided in the laminate so as to surround an edge of the bipolar electrode;
Equipped with
The bipolar electrode includes an electrode plate, a positive electrode provided on a first surface of the electrode plate, and a negative electrode provided on a second surface opposite to the first surface of the electrode plate, The positive electrode and the negative electrode are alternately arranged along the direction and stacked on each other,
The separator is interposed between the positive electrode and the negative electrode of the bipolar electrode adjacent to each other along the first direction, and extends overlapping the edge of the electrode plate as viewed from the first direction. Yes,
The sealing body is a plurality of first seals that are stacked along the first direction and are welded to the edge of the electrode plate in a state in which the separator is interposed between the sealing member and the edge of the electrode plate. A stop portion, and a second seal portion surrounding the plurality of first seal portions from the outside and joined to the first seal portion;
The first sealing portion is made of an elastic material, and is held by the second sealing portion in a state of being elastically compressed along the first direction.
Storage module. The separator is in contact with the electrode plate in a state interposed between the first sealing portion and the electrode plate.
The power storage module according to claim 1. The longitudinal elastic modulus of the first sealing portion is smaller than the longitudinal elastic modulus of the separator,
The storage module according to claim 1. The longitudinal elastic modulus of the first sealing portion is smaller than the longitudinal elastic modulus of the second sealing portion,
The storage module according to any one of claims 1 to 3. A lamination step of forming a laminate having a plurality of bipolar electrodes stacked together along a first direction, and a plurality of separators disposed between the adjacent bipolar electrodes along the first direction;
Providing a sealing body on the laminate so as to surround an edge of the bipolar electrode;
Equipped with
The bipolar electrode includes an electrode plate, a positive electrode provided on a first surface of the electrode plate, and a negative electrode provided on a second surface opposite to the first surface of the electrode plate,
The sealing body includes a plurality of first sealing portions made of an elastic material and a second sealing portion.
The sealing step includes a primary sealing step of welding the first resin portion 21 to the edge of the electrode plate before the laminating step,
The laminating step includes, after the primary sealing step, the positive electrode and the positive electrode along the first direction, interposing the separator extending in an overlapping manner on the edge of the electrode plate as viewed from the first direction. Laminating the bipolar electrodes to each other so that the negative electrodes are alternately arranged;
In the sealing step, in the state in which the separator is interposed between the first sealing portion and the edge portion of the electrode plate after the laminating step, the first sealing portion is in the first direction. By providing a second sealing portion so as to surround the first sealing portion from the outside while being elastically compressed along with the secondary sealing member for holding the first sealing portion by the second sealing portion Including sealing process,
Method of manufacturing a storage module.

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