JP7056102B2 - Manufacturing method of power storage module and power storage module - Google Patents

Description

The present invention relates to a method for manufacturing a power storage module and a power storage module.

As a conventional power storage module, for example, there is a power storage module described in Patent Document 1. This power storage module is a so-called bipolar type power storage module provided with a bipolar electrode having a positive electrode formed on one surface of an electrode plate and a negative electrode formed on the other surface. Such a power storage module includes an electrode laminate formed by laminating a plurality of bipolar electrodes via a separator. On the side surface of the electrode laminate, a sealant is provided to seal between the bipolar electrodes adjacent to each other in the stacking direction.

Japanese Unexamined Patent Publication No. 2011-204386

In forming the above-mentioned encapsulant, for example, a primary encapsulant is arranged at the edge of an electrode plate constituting the bipolar electrode, and bipolar electrodes having the primary encapsulant are laminated to form an electrode laminate. After that, the primary encapsulant of each bipolar electrode is bonded to each other by the secondary encapsulant to form the encapsulant.

However, when the sealed body is formed through the above-mentioned forming step, it is caused by the dimensional tolerance of the electrode plate, the placement accuracy of the primary sealed body at the edge of the electrode plate, the stacking accuracy of the electrode plate with the primary sealed body, and the like. Therefore, it is conceivable that the primary encapsulation bodies adjacent to each other in the stacking direction of the electrode laminated body are displaced from each other. Further, for example, it is conceivable that the primary encapsulant is deformed when the secondary encapsulant is formed. If the primary sealant is misaligned or deformed, the secondary sealant may cause poor coupling between the bipolar electrodes due to poor coupling of the primary sealant, which may lead to a decrease in the manufacturing yield of the power storage module. be.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for manufacturing a power storage module and a power storage module capable of suppressing a decrease in manufacturing yield due to poor sealing between bipolar electrodes. ..

The method for manufacturing a power storage module according to one aspect of the present invention is an intermediate laminated body in which a predetermined number of bipolar electrodes with a primary sealant are laminated by arranging a primary sealant on the edge of an electrode plate constituting the bipolar electrode. The intermediate laminate forming step of forming the primary sealant and the primary sealant step of welding the primary sealants of the bipolar electrode with the primary sealant in the intermediate laminate to form the primary sealant welded body in the intermediate laminate. An electrode laminate forming step of forming an electrode laminate including a laminate, and a secondary encapsulation step of sealing the primary encapsulation bodies including the primary encapsulation welded body in the electrode laminate with a secondary encapsulant. To prepare for.

In this method of manufacturing a power storage module, before sealing the primary sealants with the secondary sealant in the secondary sealant step, the primary sealants of the electrode laminate are welded together in the primary sealant step. Form a primary sealed weld. By forming the primary sealing welded body in advance, the influence of the positional deviation between the primary sealing bodies adjacent to each other in the stacking direction in the electrode laminated body is alleviated. Further, since the primary sealed welded body can secure sufficient strength as compared with the individual primary sealed body, it is possible to suppress the deformation of the primary sealed body when forming the secondary sealed body. Therefore, in this method of manufacturing the power storage module, it is possible to suppress the sealing failure between the bipolar electrodes due to the poor coupling of the primary sealing body by the secondary sealing body, and it is possible to suppress the decrease in the manufacturing yield.

Further, in the bipolar electrode with a primary encapsulation body, an overhanging portion protruding from the edge of the electrode plate is provided on the primary encapsulating body, and in the primary encapsulation step, the overhanging portions of the primary encapsulating body in the intermediate laminate are separated from each other. It may be welded. This makes it possible to easily and reliably weld the primary seals to each other.

Further, in the electrode laminate forming step, a plurality of intermediate laminates may be laminated to form an electrode laminate. In this case, it is possible to more reliably suppress the influence of the positional deviation between the primary encapsulating bodies adjacent to each other in the laminating direction in the electrode laminated body and the deformation of the primary encapsulating body when forming the secondary encapsulating body. ..

Further, in the electrode laminate forming step, the electrode laminate may be formed by including an intermediate laminate in which the number of laminates of the bipolar electrodes with the primary sealant is different from each other. In this case, the capacity of the power storage module can be easily adjusted by combining intermediate laminated bodies having different numbers of layers.

Further, in the primary sealing step, welding between the primary sealing bodies and welding between the primary sealing bodies and the electrode plate may be carried out at the same time. This further simplifies the manufacturing process of the power storage module.

Further, the power storage module according to one aspect of the present invention includes an electrode laminate in which a plurality of bipolar electrodes are laminated, and a sealing body that seals between bipolar electrodes adjacent to each other in the stacking direction in the electrode laminate. The encapsulant has a primary encapsulant provided at the edge of the electrode plate constituting the bipolar electrode and a secondary encapsulant for binding the primary encapsulants to each other. A primary sealing welded body is provided in which primary sealing bodies adjacent to each other in the stacking direction are welded to each other, and the primary sealing bodies including the primary sealing welding body are sealed to each other by the secondary sealing body.

In this power storage module, the primary sealing welded body alleviates the influence of the positional deviation between the primary sealing bodies adjacent to each other in the stacking direction in the electrode laminated body. Further, since the primary sealed welded body can secure sufficient strength as compared with the individual primary sealed body, it is possible to suppress the deformation of the primary sealed body when forming the secondary sealed body. Therefore, in this power storage module, it is possible to suppress the sealing failure between the bipolar electrodes due to the poor coupling of the primary sealing body by the secondary sealing body, and it is possible to suppress the decrease in the manufacturing yield.

According to the present invention, it is possible to suppress a decrease in manufacturing yield due to poor sealing between bipolar electrodes.

It is a schematic diagram which shows one Embodiment of a power storage device. It is schematic cross-sectional view which shows one Embodiment of the power storage module which constitutes the power storage device. It is an enlarged schematic diagram of a main part which shows an example of the structure of a sealed body. It is a flowchart which shows one Embodiment of the manufacturing method of a power storage module. It is a schematic diagram which shows an example of the intermediate laminate formation process and the primary sealing process. It is a schematic diagram which shows an example of the electrode laminated body formation process. It is a schematic diagram which shows another example of the electrode laminate formation process. It is a schematic diagram which shows another example of the primary sealing process.

Hereinafter, a method for manufacturing a power storage module and a preferred embodiment of the power storage module according to one aspect of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing an embodiment of a power storage device. The power storage device 1 shown in the figure is a device used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 1 includes a power storage module stack 2 in which a plurality of power storage modules 4 are laminated, and a restraint member 3 that applies a restraint load to the power storage module stack 2 in the stacking direction.

The power storage module stack 2 is composed of a plurality of (three in this embodiment) power storage modules 4 and a plurality of (four in this embodiment) conductive plates 5. The power storage module 4 is, for example, a bipolar battery provided with a bipolar electrode 14 described later, and has a rectangular shape when viewed from the stacking direction. The power storage module 4 is, for example, a secondary battery such as a nickel hydrogen secondary battery or a lithium ion secondary battery, or an electric double layer capacitor. In the following description, a nickel-metal hydride secondary battery will be illustrated.

In the power storage module stack 2, the power storage modules 4 and 4 adjacent to each other in the stacking direction are electrically connected to each other via the conductive plate 5. The conductive plates 5 are arranged between the storage modules 4 and 4 adjacent to each other in the stacking direction and outside the power storage modules 4 located at the stacking ends. A positive electrode terminal 6 is connected to one of the conductive plates 5 arranged outside the power storage module 4 located at the laminated end. The negative electrode terminal 7 is connected to the other conductive plate 5 arranged outside the power storage module 4 located at the laminated end. The positive electrode terminal 6 and the negative electrode terminal 7 are drawn out from the edge of the conductive plate 5, for example, in a direction intersecting with each other in the stacking direction. The positive electrode terminal 6 and the negative electrode terminal 7 charge and discharge the power storage device 1.

Inside each conductive plate 5, a plurality of flow paths 5a through which a refrigerant such as air flows are provided. Each flow path 5a extends in parallel with each other, for example, in a direction orthogonal to the stacking direction and the drawing direction of the positive electrode terminal 6 and the negative electrode terminal 7. By circulating the refrigerant through these flow paths 5a, the conductive plate 5 functions as a connecting member for electrically connecting the power storage modules 4 and 4 to each other, and also dissipates heat generated by the power storage module 4. It also has the function of. In the example of FIG. 1, the area of the conductive plate 5 seen from the stacking direction is smaller than the area of the power storage module 4, but from the viewpoint of improving heat dissipation, the area of the conductive plate 5 is the power storage module. It may be the same as the area of 4 and may be larger than the area of the power storage module 4.

The restraint member 3 is composed of a pair of end plates 8 and 8 that sandwich the power storage module laminate 2 in the stacking direction, and a fastening bolt 9 and a nut 10 that fasten the end plates 8 and 8 to each other. The end plate 8 is a rectangular metal plate having an area one size larger than the area of the power storage module 4 and the conductive plate 5 when viewed from the stacking direction. A film F having electrical insulation is provided on the inner side surface of the end plate 8 (the surface on the side of the storage module laminate 2). The film F electrically insulates between the end plate 8 and the conductive plate 5.

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

Next, the configuration of the power storage module 4 will be described. FIG. 2 is a schematic cross-sectional view showing an embodiment of the power storage module. As shown in the figure, the power storage module 4 includes an electrode laminated body 11 and a resin-made sealing body 12 that seals the electrode laminated body 11.

The electrode laminate 11 is configured by laminating a plurality of bipolar electrodes 14 via a separator 13. In the present embodiment, the stacking direction of the electrode laminated body 11 and the stacking direction of the power storage module laminated body 2 are the same. The electrode laminate 11 has a side surface 11a extending in the stacking direction. The bipolar electrode 14 includes an electrode plate 15, a positive electrode 16 provided on one surface 15a of the electrode plate 15, and a negative electrode 17 provided on the other surface 15b of the electrode plate 15.

The positive electrode 16 is a positive electrode active material layer coated with a positive electrode active material. The negative electrode 17 is a negative electrode active material layer coated with a negative electrode active material. In the electrode laminate 11, the positive electrode 16 of one bipolar electrode 14 faces the negative electrode 17 of one of the bipolar electrodes 14 adjacent to each other in the stacking direction with the separator 13 interposed therebetween. In the electrode laminate 11, the negative electrode 17 of one bipolar electrode 14 faces the positive electrode 16 of the other bipolar electrode 14 adjacent to each other in the stacking direction with the separator 13 interposed therebetween.

In the electrode laminate 11, the negative electrode termination electrode 18 is arranged at one end in the stacking direction. Further, a positive electrode termination electrode 19 is arranged at the other end in the stacking direction. The negative electrode terminal electrode 18 includes an electrode plate 15 and a negative electrode 17 provided on the other surface 15b of the electrode plate 15. The negative electrode 17 of the negative electrode terminal electrode 18 faces the positive electrode 16 of the bipolar electrode 14 at one end in the stacking direction via the separator 13. One conductive plate 5 adjacent to the power storage module 4 is in contact with one surface 15a of the electrode plate 15 of the negative electrode terminal electrode 18. The positive electrode terminal electrode 19 includes an electrode plate 15 and a positive electrode 16 provided on one surface 15a of the electrode plate 15. The other conductive plate 5 adjacent to the power storage module 4 is in contact with the other surface 15b of the electrode plate 15 of the positive electrode terminal electrode 19. The positive electrode 16 of the positive electrode terminal electrode 19 faces the negative electrode 17 of the bipolar electrode 14 at the other end in the stacking direction via the separator 13.

The electrode plate 15 is made of, for example, a metal foil made of nickel or a nickel-plated steel plate, and has a rectangular shape. The edge portion 15c of the electrode plate 15 is an uncoated region in which the positive electrode active material and the negative electrode active material are not coated. Examples of the positive electrode active material constituting the positive electrode 16 include nickel hydroxide. Examples of the negative electrode active material constituting the negative electrode 17 include a hydrogen storage alloy. In the present embodiment, the formation region of the negative electrode 17 on the other surface 15b of the electrode plate 15 is slightly larger than the formation region of the positive electrode 16 on the one surface 15a of the electrode plate 15.

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

The sealing body 12 is formed in a rectangular tubular shape, for example, by an insulating resin. The sealing body 12 is configured to hold the edge portion 15c of the electrode plate 15 on the side surface 11a of the electrode laminated body 11 extending in the stacking direction and to surround the side surface 11a. The sealing body 12 includes a primary sealing body 21 provided along the edge portion 15c of the electrode plate 15 of each bipolar electrode 14, and two provided so as to surround the entire primary sealing body 21 from the outside. It is composed of a subsealing body 22 and the like.

The primary sealant 21 is formed, for example, by injection molding of a resin, and is continuously provided over all sides of the electrode plate 15 at the edge portion 15c (uncoated region) on the one side 15a side of the electrode plate 15. There is. The primary sealant 21 has a function as a spacer between the electrode plates 15 and 15 of the bipolar electrodes 14 and 14 adjacent to each other in the stacking direction. An internal space V defined by the spacing between the primary sealants 21 and 21 in the stacking direction is formed between the electrode plates 15 and 15. The internal space V contains an electrolytic solution E made of an alkaline solution such as an aqueous potassium hydroxide solution.

The primary sealing body 21 has an overlapping portion 21a that overlaps the edge portion 15c of the electrode plate 15, and an overhanging portion 21b that projects outward from the edge of the electrode plate 15. At least a part of the overlapping portion 21a is firmly bonded to the edge portion 15c by welding using, for example, ultrasonic waves or heat. In connecting the primary sealing body 21 and the electrode plate 15, the bonding surface of the electrode plate 15 with the primary sealing body 21 is a roughened plated surface provided with a plurality of fine protrusions. In the present embodiment, the entire surface of one surface 15a of the electrode plate 15 provided with the positive electrode 16 is a roughened plated surface. The fine protrusions are, for example, protrusion-shaped precipitated metal (including an impart) formed by electrolytic plating on the electrode plate 15. On the roughened plated surface, the resin material constituting the primary encapsulant 21 enters the gaps between the fine protrusions to produce an anchor effect, and the bond strength and liquid tightness between the electrode plate 15 and the primary encapsulant 21 are formed. The sex is improved.

As shown in FIG. 3, the electrode laminated body 11 is provided with a primary sealed welded body 31 in which the primary sealed bodies 21 and 21 adjacent to each other in the laminated direction are welded to each other. The primary sealing welded body 31 is a bonded body in which overhanging portions 21b of a plurality of layers of primary sealed bodies 21 adjacent to each other in the stacking direction are bonded to each other by welding using, for example, ultrasonic waves or heat. In the example of FIG. 3, in the electrode laminated body 11, the primary sealed welded body 31 formed by welding the overhanging portions 21b of the three-layer primary sealed body 21 to each other is arranged in the stacking direction of the electrode laminated body 11. ..

The secondary sealing body 22 is formed, for example, by injection molding of a resin, and extends over the entire length of the electrode laminated body 11 in the stacking direction. The secondary encapsulant 22 is welded to the outer surface of the primary encapsulant welded body 31 by heat during injection molding, for example. Further, the secondary sealing body 22 also penetrates between the primary sealing welding bodies 31 and 31 adjacent to each other in the stacking direction, and is firmly bonded to the primary sealing welding body 31. With such a configuration, the electrolytic solution E housed in the internal space V can pass between the primary sealing welded bodies 31 and 31 adjacent to each other in the stacking direction, but the primary sealed welded body 31 and the secondary sealed body 22 It is sealed at the welded part with.

Examples of the resin material constituting the primary sealant 21 include acid-modified polypropylene, modified polyphenylene ether, polypropylene, and a thermoplastic elastomer in which a rubber component and polypropylene are mixed. In addition, examples of the material constituting the secondary encapsulant 22 include modified polyphenylene ether.

Subsequently, a method of manufacturing the power storage module 4 will be described. FIG. 4 is a flowchart showing an embodiment of the above-mentioned method for manufacturing a power storage module. As shown in the figure, the method for manufacturing the power storage module includes an intermediate laminate forming step (step S01), a primary sealing step (step S02), an electrode laminate forming step (step S03), and a secondary sealing. It is configured to include a stopping step (step S04).

In the intermediate laminate forming step, as shown in FIG. 5A, the bipolar electrode 32 with a primary sealing body is formed by arranging the primary sealing body 21 in advance on the edge portion 15c of the electrode plate 15 constituting the bipolar electrode 14. Is used. In the bipolar electrode 32 with a primary sealing body, at least a part of the overlapping portion 21a of the primary sealing body 21 is previously welded to the edge portion 15c of one surface 15a of the electrode plate 15. In the example of FIG. 5A, the bipolar electrode 32 with the primary sealant having three layers is laminated via the separator 13. The intermediate laminated body K is formed by laminating the bipolar electrodes 32 with the primary sealant.

In the primary sealing step, as shown in FIG. 5A, a pair of heaters 33 are used to sandwich and stretch the overhanging portion 21b of the primary sealing body 21 in the bipolar electrode 32 with the primary sealing body having three layers. The protruding portions 21b are welded together. As a result, as shown in FIG. 5B, the overhanging portions 21b of the primary sealing body 21 are bonded to each other, and the primary sealing welded body 31 is formed in the intermediate laminated body K. By repeatedly carrying out the intermediate laminate forming step and the primary sealing step, the intermediate laminate K having the primary sealed welded body 31 is formed according to the required number.

In the electrode laminate forming step, as shown in FIG. 6, a plurality of intermediate laminates K having the primary sealed welded body 31 are laminated as needed to form the electrode laminate 11. In the secondary sealing step, the electrode laminate 11 is placed in a mold for injection molding. Then, the molten resin is injected into the mold to form the secondary sealing body 22 so as to cover the primary sealing welding body 31 of the electrode laminate 11. As a result, the primary sealing welded bodies 31, 31 are bonded to each other by the secondary sealing body 22, and the sealing body 12 is formed on the side surface 11a of the electrode laminated body 11.

As described above, in this method of manufacturing the power storage module, the electrode laminate is formed in the primary sealing step before the primary sealing bodies 21 and 21 are sealed by the secondary sealing body 22 in the secondary sealing step. The primary sealing welders 21 and 21 of 11 are welded together to form the primary sealing welded body 31. By forming the primary sealing welded body 31 in advance, the influence of the positional deviation between the primary sealed bodies 21 and 21 adjacent to each other in the stacking direction in the electrode laminated body 11 is alleviated. Further, since the primary sealing welded body 31 can secure sufficient strength as compared with the individual primary sealed body 21, the pressure resistance against the molten resin injected into the mold during injection molding is increased, and the secondary sealed body is increased. Deformation of the primary sealant 21 when forming 22 can also be suppressed. Therefore, in this method of manufacturing the power storage module, it is possible to suppress the sealing failure between the bipolar electrodes 14 and 14 due to the poor coupling of the primary sealing body 21 by the secondary sealing body 22, and it is possible to suppress the decrease in the manufacturing yield. It will be possible.

Further, in the present embodiment, in the bipolar electrode 32 with the primary encapsulation body, the overhanging portion 21b protruding from the edge portion 15c of the electrode plate 15 is provided on the primary encapsulation body 21, and in the primary encapsulation step, the intermediate laminate K is provided. The overhanging portions 21b and 21b of the primary sealing body 21 in the above are welded to each other. As a result, welding of the primary encapsulants 21 and 21 can be carried out easily and reliably.

In FIG. 3 and the like, the outer surface of the primary sealed welded body 31 is schematically drawn flat, but depending on the degree of misalignment of the primary sealed body 21 in the intermediate laminate K, the primary sealed after welding. It is also possible that the outer surface of the welded body 31 has irregularities. However, the unevenness on the outer surface of the primary sealed welded body 31 does not affect the bonding of the primary sealed welded body 31 by the secondary sealed body 22, and does not lead to a decrease in the manufacturing yield. Further, in the primary sealing welded body 31, it is sufficient that at least a part of the overhanging portion 21b of the primary sealing body 21 is welded to each other, and it is not always necessary that the entire overhanging portion 21b is welded to each other. .. For example, only the inner edge sides of the overhanging portion 21b may be welded to each other, and the outer edge side of the overhanging portion 21b may not be welded.

Further, in the present embodiment, a plurality of intermediate laminated bodies K are laminated to form the electrode laminated body 11 in the electrode laminated body forming step. In this case, in the electrode laminated body 11, the influence of the positional deviation between the primary sealing bodies 21 and 21 adjacent to each other in the stacking direction is alleviated, and the deformation of the primary sealing body 21 when forming the secondary sealing body 22 is suppressed. Can be realized more reliably. In the present embodiment, the intermediate laminated body K having the same number of laminated bipolar electrodes 32 with the primary sealant is laminated to form the electrode laminated body 11. Therefore, it is possible to avoid an increase in the number of parts of the power storage module 4.

The present invention is not limited to the above embodiment. For example, in the above embodiment, a plurality of intermediate laminated bodies K are laminated to form the electrode laminated body 11 in the electrode laminated body forming step, but the number of laminated intermediate laminated bodies K may be arbitrary. For example, the electrode laminate 11 may be formed by combining one or a plurality of intermediate laminates K and one or a plurality of bipolar electrodes 32 with a primary sealant. Further, as shown in FIG. 7, the electrode laminated body 11 may be formed by including the intermediate laminated body K in which the number of laminated bipolar electrodes 32 with the primary sealant is different from each other. According to these configurations, the capacity of the power storage module 4 can be easily adjusted.

Further, for example, in the above embodiment, in the primary sealing step, the bipolar electrode 32 with the primary sealing body in which the primary sealing body 21 is previously welded to the electrode plate 15 is used, and the overhanging portions 21b, 21b of the primary sealing body 21 are used. Welding of each other is carried out. For example, as shown in FIG. 8, the holding range of the primary sealing body 21 by the heaters 33 and 33 is further extended to the inner edge side of the primary sealing body 21, and the primary sealing body 21 is carried out. Welding of the overhanging portions 21b and 21b of the above and welding of the overlapping portion 21a of the primary sealing body 21 and the edge portion 15c of the one surface 15a of the electrode plate 15 may be carried out at the same time. As a result, the manufacturing process of the power storage module 4 can be further simplified.

4 ... Energy storage module, 11 ... Electrode laminate, 14 ... Bipolar electrode, 15 ... Electrode plate, 15c ... Edge, 21 ... Primary encapsulation, 21b ... Overhang, 22 ... Secondary encapsulation, 31 ... Primary Sealed welded body, 32 ... Bipolar electrode with primary sealed body, K ... Intermediate laminate.

Claims (5)

A bipolar electrode with a primary sealant having a positive electrode on one side of the electrode plate and a negative electrode on the other side, and a primary sealant formed of a resin arranged on the edge of the electrode plate, and a separator. An intermediate laminate forming step of alternately laminating a predetermined number of and to form an intermediate laminate,
In the bipolar electrode with a primary sealant in the intermediate laminate, the overhanging portions of the primary sealant overhanging from the edge of the electrode plate are welded to each other to form a primary sealant welded body in the intermediate laminate. Primary sealing process and
Another intermediate laminate on which the primary sealed weld is formed is laminated on the intermediate laminate on which the primary sealed weld is formed, and the primary is laminated between the primary sealed welds adjacent to each other in the stacking direction. An electrode laminate forming step of forming an electrode laminate without providing a welded portion between sealed bodies, and
A secondary sealed body is formed on the side surface of the electrode laminated body by injecting a molten resin into a mold in which the electrode laminated body is arranged, and the primary sealed welded bodies of the intermediate laminated body are bonded to each other. A method for manufacturing a power storage module, comprising a secondary sealing step of welding the secondary sealing body to each of the primary sealing welding bodies. The method for manufacturing a power storage module according to claim 1, wherein in the intermediate laminate forming step, the primary encapsulation body arranged at the edge portion of the electrode plate is previously welded to the edge portion of the electrode plate. The method for manufacturing a power storage module according to claim 1 or 2, wherein in the electrode laminate forming step, the electrode laminate is formed by including the intermediate laminate in which the number of laminates of the bipolar electrodes with the primary sealant is different from each other. The method for manufacturing a power storage module according to claim 1 , wherein in the primary sealing step, welding between overhanging portions of the primary sealing body and welding between the primary sealing body and the electrode plate are simultaneously performed. .. A plurality of bipolar electrodes having a positive electrode on one surface of the electrode plate and a negative electrode on the other surface, and an electrode laminate in which separators are alternately laminated.
In the electrode laminated body, a sealing body for sealing between the bipolar electrodes adjacent to each other in the stacking direction is provided.
The encapsulant is formed of a resin, and is formed on the side surface of the electrode laminate by a primary encapsulant provided at the edge of an electrode plate constituting the bipolar electrode and an injection molded body of molten resin. It has a secondary sealant bonded to the primary sealant adjacent to each other in the stacking direction, and has.
The primary sealant has an overhanging portion overhanging from the edge of the electrode plate.
The electrode laminated body is provided with a plurality of primary sealed welded bodies in which overhanging portions of the primary sealed bodies adjacent to each other in the laminated direction are welded to each other.
The secondary sealed body is welded to each of the primary sealed welded bodies so that the primary sealed welded bodies are bonded to each other, and the primary sealed body is between the primary sealed welded bodies adjacent to each other in the stacking direction. A power storage module that is not provided with welded parts between sealed bodies.

Images