JP6907737B2 - 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.

Patent Document 1 describes a bipolar thin battery. This bipolar thin battery includes a bipolar electrode having a positive electrode, a negative electrode, and a current collector, an electrolyte layer containing a separator and an electrolytic solution, a seal portion, and an exterior member that encloses the seal portion. The bipolar electrode has a positive electrode formed on one main surface of the current collector and a negative electrode formed on the other main surface. The seal portion has a first seal portion arranged so as to surround the positive electrode on one main surface of the current collector, and a negative electrode on the other surface of the current collector at the same back position as the position of the first seal portion. Includes a second seal that is arranged to surround it.

JP-A-2010-287451

In the above-mentioned bipolar thin battery, a plurality of bipolar electrodes are laminated via a seal portion and a separator to form a laminated body. On the other hand, in the above-mentioned bipolar thin battery, it is conceivable to further seal the sealing portions for the purpose of integrating the laminated body and improving the sealing property. In this case, for example, in three bipolar electrodes adjacent to each other, if the end face of the seal portion provided on the central bipolar electrode is displaced inward from the end face of the seal portion provided on the other bipolar electrode and is recessed. It becomes difficult for the sealing material to enter the recess, and filling defects may occur. As a result, the sealing property of the laminated body may decrease.

Therefore, an object of the present invention is to provide a method for manufacturing a power storage module capable of suppressing deterioration of the sealing property of the laminated body, and a power storage module.

The method for manufacturing a power storage module according to the present invention includes a metal foil, a bipolar electrode including a positive electrode active material layer provided on one surface of the metal foil, and a negative electrode active material layer provided on the other surface of the metal foil, and a metal. A first step of laminating a plurality of electrode bodies including a first sealing member provided in a frame shape along the outer edge of the foil and extending to the outside of the metal foil so that the first sealing members overlap each other. After the first step, a second step of forming a new end on the first sealing member by cutting the ends of a plurality of first sealing members so as not to cut the metal foil, and a first step at the new end. (1) A third step of sealing the sealing members with each other is provided.

In this manufacturing method, first, an electrode body including a bipolar electrode and a first sealing member provided on the metal foil thereof is laminated so that the first sealing members overlap each other. Subsequently, the end portion of the first sealing member is cut so as not to cut the metal foil. Then, the first seal members are further sealed with each other at the new end portion generated by the cutting of the first seal member. As a result, the laminated body of the electrode bodies can be integrated and the sealing property can be improved. In particular, in this manufacturing method, as described above, the end portion of the first seal member is cut to form a new end portion. Therefore, when the first seal member is further sealed, the end faces (end faces of the new end portions) of the first seal member are aligned. Therefore, poor filling of the sealing material due to the displacement of the end face of the first sealing member is unlikely to occur. Therefore, the deterioration of the sealing property of the laminated body is suppressed.

In the method for manufacturing a power storage module according to the present invention, a fourth step of temporarily fixing the first seal members to each other by welding may be provided between the second step and the third step. In this case, the displacement of the electrode body can be suppressed when the laminated body is transferred in the third step.

In the method for manufacturing a power storage module according to the present invention, in the third step, the first seal members may be used to seal the first seal members with each other. At this time, in the third step, the first sealing members may be sealed to each other by joining the second sealing member to the new end portion by heating. Alternatively, in the third step, the first sealing members may be sealed with each other by providing a second sealing member at a new end portion by injection molding. In these cases, it is possible to suppress poor filling of the material constituting the second sealing member and surely suppress a decrease in sealing property.

In the method for manufacturing a power storage module according to the present invention, in the second step, the first seal member may be cut using an ultrasonic cutter. In this case, the first seal member can be cut while suppressing deterioration due to heat and deformation due to shearing force of the first seal member.

The power storage module according to the present invention includes a laminated body including a plurality of electrode bodies laminated to each other, and the electrode body includes a metal foil, a positive electrode active material layer provided on one surface of the metal foil, and a metal foil. A bipolar electrode including a negative electrode active material layer provided in the direction and a first sealing member provided in a frame shape along the outer edge of the metal foil and extending to the outside of the metal foil are included, and are included in the stacking direction in the laminated body. The ends of the first sealing members of the electrode bodies that are adjacent to each other along the same line are aligned with each other and are sealed to each other.

In this power storage module, at least the ends of the first seal members of the electrode bodies adjacent to each other along the stacking direction in the laminated body are aligned. Therefore, for the same reason as described above, the deterioration of the sealing property of the laminated body is suppressed.

In the power storage module according to the present invention, in the electrode bodies adjacent to each other, the amount of deviation between the end faces defining the ends of the first seal member is the sum of the thickness of the first seal member and the thickness of the metal foil in the stacking direction. It may be less than twice as much as. If the ends of the first sealing member are aligned in such a range, defective filling of the sealing material can be reliably suppressed.

According to the present invention, it is possible to provide a method for manufacturing a power storage module capable of suppressing deterioration of the sealing property of a laminated body and a power storage module.

It is schematic cross-sectional view which shows one Embodiment of the power storage device including the power storage module. It is schematic cross-sectional view which shows the power storage module which comprises the power storage device of FIG. It is a figure which shows the laminated body shown in FIG. It is a side view for demonstrating the deviation of the end portion of the 1st seal member. It is a figure which shows the main process of the manufacturing method of a power storage module. It is a figure which shows the main process of the manufacturing method of a power storage module. It is a figure which shows the main process of the manufacturing method of a power storage module. It is a figure which shows the main process of the manufacturing method of a power storage module.

Hereinafter, an embodiment of a power storage module and a method for manufacturing the power storage module will be described with reference to the drawings. In the description of the drawings, the same elements or the corresponding elements may be designated by the same reference numerals, and duplicate description may be omitted. Further, the drawing may show a three-dimensional Cartesian coordinate system defined by the X-axis, the Y-axis, and the Z-axis.

FIG. 1 is a schematic cross-sectional view showing an embodiment of a power storage device including a power storage module. The power storage device 10 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 10 includes a plurality of (three in this embodiment) power storage modules 12, but may include a single power storage module 12. The power storage module 12 is, for example, a bipolar battery. The power storage module 12 is a secondary battery such as a nickel hydrogen secondary battery or a lithium ion secondary battery, but may be an electric double layer capacitor. In the following description, a nickel-metal hydride secondary battery will be illustrated.

The plurality of power storage modules 12 are laminated via a conductive plate 14 such as a metal plate. Seen from the stacking direction D1, the power storage module 12 and the conductive plate 14 have, for example, a rectangular shape. Details of each power storage module 12 will be described later. The conductive plates 14 are also arranged on the outside of the power storage modules 12 located at both ends in the stacking direction D1 (Z-axis direction) of the power storage modules 12. The conductive plate 14 is electrically connected to the adjacent power storage modules 12. As a result, the plurality of power storage modules 12 are connected in series in the stacking direction D1.

In the stacking direction D1, the positive electrode terminal 24 is connected to the conductive plate 14 located at one end, and the negative electrode terminal 26 is connected to the conductive plate 14 located at the other end. The positive electrode terminal 24 may be integrated with the conductive plate 14 to be connected. The negative electrode terminal 26 may be integrated with the conductive plate 14 to be connected. The positive electrode terminal 24 and the negative electrode terminal 26 extend in a direction (X-axis direction) intersecting the stacking direction D1. The positive electrode terminal 24 and the negative electrode terminal 26 can be used to charge and discharge the power storage device 10.

The conductive plate 14 can also function as a heat radiating plate for releasing the heat generated in the power storage module 12. By allowing a refrigerant such as air to pass through the plurality of voids 14a provided inside the conductive plate 14, the heat from the power storage module 12 can be efficiently released to the outside. Each void 14a extends, for example, in a direction intersecting the stacking direction D1 (Y-axis direction). The conductive plate 14 is smaller than the power storage module 12 when viewed from the stacking direction D1, but may be the same as or larger than the power storage module 12.

The power storage device 10 includes a restraint member 16 that restrains the alternately stacked power storage modules 12 and the conductive plates 14 in the stacking direction D1. The restraint member 16 includes a pair of restraint plates 16A and 16B and connecting members (bolts 18 and nuts 20) that connect the restraint plates 16A and 16B to each other. An insulating film 22 such as a resin film is arranged between the restraint plates 16A and 16B and the conductive plate 14. Each of the restraint plates 16A and 16B is made of a metal such as iron. The restraint plates 16A and 16B and the insulating film 22 have, for example, a rectangular shape when viewed from the stacking direction D1. The insulating film 22 is larger than the conductive plate 14, and the restraint plates 16A and 16B are larger than the power storage module 12.

Seen from the stacking direction D1, an insertion hole H1 through which the shaft portion of the bolt 18 is inserted is provided at a position outside the power storage module 12 at the edge portion of the restraint plate 16A. Similarly, when viewed from the stacking direction D1, an insertion hole H2 through which the shaft portion of the bolt 18 is inserted is provided at a position outside the power storage module 12 at the edge portion of the restraint plate 16B. When the restraint plates 16A and 16B have a rectangular shape when viewed from the stacking direction D1, the insertion holes H1 and the insertion holes H2 are located at the corners of the restraint plates 16A and 16B.

One restraint plate 16A is abutted against the conductive plate 14 connected to the negative electrode terminal 26 via the insulating film 22, and the other restraint plate 16B has the insulating film 22 attached to the conductive plate 14 connected to the positive electrode terminal 24. It is struck through. For example, the bolt 18 is passed through the insertion hole H1 from one restraint plate 16A side toward the other restraint plate 16B side, and a nut 20 is screwed into the tip of the bolt 18 protruding from the other restraint plate 16B. There is. As a result, the insulating film 22, the conductive plate 14, and the power storage module 12 are sandwiched and unitized, and a restraining load is applied to the stacking direction D1.

FIG. 2 is a schematic cross-sectional view showing a power storage module constituting the power storage device of FIG. The power storage module 12 includes a laminated body 30. The laminated body 30 includes a plurality of electrode bodies 31 laminated to each other. The electrode body 31 includes a bipolar electrode 32 and a seal member (first seal member) 52, respectively. The electrode bodies 31 are laminated so that the bipolar electrodes 32 overlap each other and the seal members 52 overlap each other. Here, as an example, since the stacking direction of the electrode body 31 in the laminated body 30 is along the above-mentioned stacking direction D1, it is also referred to as the stacking direction D1 below.

The laminated body 30 has, for example, a rectangular shape when viewed from the stacking direction D1. A separator 40 may be arranged between adjacent bipolar electrodes 32. The bipolar electrode 32 includes an electrode plate 34, a positive electrode 36 provided on one surface of the electrode plate 34, and a negative electrode 38 provided on the other surface of the electrode plate 34. In the laminated body 30, the positive electrode 36 of one bipolar electrode 32 faces the negative electrode 38 of one of the bipolar electrodes 32 adjacent to the stacking direction D1 with the separator 40 interposed therebetween, and the negative electrode 38 of one bipolar electrode 32 is the separator 40. Is opposed to the positive electrode 36 of the other bipolar electrode 32 adjacent to each other in the stacking direction D1.

In the stacking direction D1, an electrode plate 34 (negative electrode side terminal electrode) having a negative electrode 38 arranged on the inner side surface is arranged at one end of the laminated body 30, and a positive electrode 36 is arranged on the inner side surface at the other end of the laminated body 30. The arranged electrode plate 34 (positive electrode side terminal electrode) is arranged. The negative electrode 38 of the negative electrode side terminal electrode faces the positive electrode 36 of the uppermost bipolar electrode 32 via the separator 40. The positive electrode 36 of the positive electrode side terminal electrode faces the negative electrode 38 of the lowermost bipolar electrode 32 via the separator 40. The electrode plates 34 of these terminal electrodes are connected to adjacent conductive plates 14 (see FIG. 1).

The electrode plate 34 is a rectangular metal leaf made of, for example, nickel. The edge portion 34a of the electrode plate 34 is an uncoated region in which the positive electrode active material and the negative electrode active material are not coated, and the uncoated region is buried in the seal member 52 constituting the inner wall of the frame body 50. It is an area to be held. Examples of the positive electrode active material constituting the positive electrode 36 include nickel hydroxide. Examples of the negative electrode active material constituting the negative electrode 38 include a hydrogen storage alloy. The formation region of the negative electrode 38 on the other surface of the electrode plate 34 is slightly larger than the formation region of the positive electrode 36 on one surface of the electrode plate 34. As described above, the bipolar electrode 32 includes the metal foil (electrode plate 34), the positive electrode active material layer (positive electrode 36) provided on one surface of the metal foil, and the negative electrode active material layer provided on the other surface of the metal foil. (Negative electrode 38) is included.

The separator 40 is formed, for example, in the form of a sheet. Examples of the material for forming the separator 40 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), a woven fabric made of polypropylene or the like, or a non-woven fabric. Further, the separator 40 may be reinforced with a vinylidene fluoride resin compound or the like. The separator 40 is not limited to a sheet shape, and a bag shape may be used.

FIG. 3 is a diagram showing the laminate shown in FIG. FIG. 3A is a perspective view, and FIG. 3B is a plan view. As shown in FIGS. 2 and 3, the laminated body 30 includes a plurality of sealing members (first sealing member) 52. The seal member 52 is formed in a frame shape when viewed from the stacking direction D1. More specifically, the seal member 52 is provided in a frame shape along the outer edge 34e of the electrode plate 34. Therefore, here, since the planar shape of the electrode plate 34 is rectangular, the seal member 52 has a rectangular frame shape (rectangular annular shape). One sealing member 52 is provided for each of the electrode plates 34 (that is, each of the bipolar electrodes 32).

When viewed from the stacking direction D1, the inner edge 52a of the seal member 52 is located inside the outer edge 34e of the electrode plate 34, and the outer edge 52e of the seal member 52 is located outside the outer edge 34e of the electrode plate 34. Therefore, the seal member 52 overlaps the electrode plate 34 at the frame-shaped inner portion 52p and protrudes from the electrode plate 34 at the frame-shaped outer portion 52r. In other words, the sealing member 52 extends to the outside of the electrode plate 34. The seal member 52 is welded to at least one surface of the corresponding electrode plate 34 (here, the one surface provided with the positive electrode 36) at the inner portion 52p thereof.

The seal members 52 are laminated with each other along the stacking direction D1. A part of the electrode plate 34 and a part of the seal member 54, which will be described later, are interposed between the seal members 52 adjacent to each other along the stacking direction D1. The sealing member 52 is, for example, an insulating resin and is composed of polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), or the like.

Here, at least the outer end portions 52q of the seal members 52 of the electrode bodies 31 adjacent to each other along the stacking direction D1 (hereinafter, may be simply referred to as “seal members 52 adjacent to each other”) are aligned with each other. As shown in FIG. 4, the fact that the ends 52q of the sealing members 52 adjacent to each other are aligned with each other means that the deviation amount DA between the end faces 52s defining the end 52q is the seal member 52 in the stacking direction D1. It means that it is not more than twice the total T of the thickness and the thickness of the electrode plate 34. However, the deviation amount DA is preferably 1 times or less of the total T, and more preferably 0.5 times or less.

See FIGS. 2 and 3 again. The power storage module 12 further includes a seal member (second seal member) 54. The seal member 54 is provided in an annular shape on the side portion of the laminated body 30 over the entire circumference of the laminated body 30. More specifically, the sealing member 54 is integrally provided on the end portion 52q of the plurality of sealing members 52 and the edge portion 34a of the electrode plate 34, for example, by injection molding, and further seals the sealing members 52 with each other. (It is the second seal member).

The seal member 52 and the seal member 54 are joined to each other to form a single frame 50. As a result, an internal space V that is at least liquid-tightly partitioned by the electrode plate 34 and the sealing member 52 is formed between the electrode plates 34 adjacent to each other in the stacking direction D1. The internal space V contains an electrolytic solution (not shown) composed of an alkaline solution such as an aqueous potassium hydroxide solution. The seal member 54 can be made of, for example, the same material as the seal member 52.

Subsequently, the manufacturing method of the above-mentioned power storage module 12 will be described. In this manufacturing method, as shown in FIGS. 5 and 6, first, the laminated body 30 is prepared by laminating the electrode bodies 31. In the laminated body 30 here, as compared with the above-mentioned laminated body 30, the sealing member 52 includes a frame-shaped (annular) planned cutting portion (cutting allowance) 52c extending further outward than the outer portion 52r. It differs in that it is.

That is, in this step, the metal foil (electrode plate 34), the positive electrode active material layer (positive electrode 36) provided on one surface of the metal foil, and the negative electrode active material layer (negative electrode) provided on the other surface of the metal foil. The sealing members 52 overlap each other with a plurality of electrode bodies 31 including a bipolar electrode 32 including 38) and a sealing member 52 provided in a frame shape along the outer edge of the metal foil and extending to the outside of the metal foil. (1st step). This lamination can be performed, for example, by sequentially accommodating the electrode bodies 31 in a box-shaped jig A slightly larger than the laminated body 30.

Subsequently, as shown in FIG. 7A, the laminated body 30 is taken out from the laminating jig A and placed on another cutting jig B. Then, as shown in FIG. 7B, the end portions 52w of the plurality of sealing members 52 are cut at once. Here, the seal member 52 is cut along the boundary between the planned cutting portion 52c and the outer portion 52r. As a result, a new end portion 52q (shown in FIGS. 2 and 3) is formed on the seal member 52. Therefore, the electrode plate 34 is not cut here. That is, in this step, after the first step, a new end portion 52q is formed on the seal member 52 by cutting the end portions 52w of the plurality of sealing members 52 so as not to cut the metal foil (electrode plate 34). (Second step).

Before this second step, the end portions 52w of the seal member 52 may not be aligned with each other due to dimensional errors of each portion, misalignment during stacking, and the like. On the other hand, after this second step, the end portions 52q of the seal member 52 are collectively cut to obtain end portions 52q aligned with each other. In this second step, the seal member 52 can be cut by using, for example, an ultrasonic cutter C.

Subsequently, as shown in FIG. 8A, the laminated body 30 is transferred from the cutting jig B and placed on another jig (form) D for injection molding, for example. Then, as shown in FIG. 8B, the seal member 54 is formed. That is, the seal members 52 are sealed with each other at the new end 52q of the seal member 52 formed in the second step (third step). Here, the seal members 52 are sealed with each other by using a seal member (seal material) 54 different from the seal member 52. More specifically, as an example, the seal members 52 are sealed with each other by providing another seal member 54 at the new end portion 52q by injection molding. As described above, the frame body 50 and the internal space V are formed, and the power storage module 12 is manufactured.

As described above, in the above manufacturing method, first, the sealing members 52 overlap each other with the electrode body 31 including the bipolar electrode 32 and the sealing member 52 provided on the metal foil (electrode plate 34) thereof. (1st step). Subsequently, the end portion 52w of the seal member 52 is cut so as not to cut the metal foil (second step). Then, the seal members 52 are further sealed with each other at the new end portion 52q generated by the cutting of the seal member 52 (third step).

As a result, the laminated body 30 of the electrode body 31 can be integrated and the sealing property can be improved. In particular, in this manufacturing method, as described above, the end portion 52w of the seal member 52 is cut to form a new end portion 52q. Therefore, when the seal member 52 is further sealed, the end faces 52s (end faces of the new end 52q) of the seal member 52 are aligned. Therefore, poor filling of the sealing material due to the displacement of the end surface 52s of the sealing member 52 is unlikely to occur. Therefore, the deterioration of the sealing property of the laminated body 30 is suppressed.

Further, in this manufacturing method, in the third step, the seal members 52 are sealed with each other by using another seal member 54. At this time, in the third step, the seal members 52 are sealed with each other by providing another seal member 54 at the new end portion 52q by injection molding. Therefore, it is possible to suppress poor filling of the material constituting the seal member 54 and surely suppress deterioration of the seal property.

Further, in this manufacturing method, in the second step, the sealing member 52 is cut using an ultrasonic cutter. Therefore, the seal member 52 can be cut while suppressing deterioration due to heat and deformation due to shearing force of the seal member 52.

Here, in the power storage module 12, the ends 52q of the seal members 52 of the electrode bodies 31 adjacent to each other along the stacking direction D1 in the laminated body 30 are aligned. Therefore, for the same reason as described above, the deterioration of the sealing property of the laminated body 30 is suppressed. In the power storage module 12, in the electrode bodies 31 adjacent to each other, the amount of deviation DA between the end faces 52s defining the end 52q of the seal member 52 is the thickness of the seal member 52 in the stacking direction D1 and the metal foil (electrode plate). It is less than twice the total T with the thickness of 34). If the ends 52q of the seal member 52 are aligned in such a range, defective filling of the seal material can be reliably suppressed.

The above-described embodiment describes a method for manufacturing a power storage module and an embodiment of a power storage module according to the present invention. Therefore, the method for manufacturing the power storage module and the power storage module according to the present invention are not limited to the above, and can be arbitrarily modified without changing the gist of each claim.

For example, in the method for manufacturing the power storage module 12, the laminate 30 is transferred between the first step and the second step, and between the second step and the third step. Therefore, the manufacturing method further includes a fourth step of temporarily fixing the sealing members 52 to each other by welding between the first step and the second step, and between the second step and the third step. May be good. In this case, the displacement of the electrode body 31 can be suppressed when the laminated body 30 is transferred in each step. In particular, it is more important to suppress the misalignment after the end portions 52q of the seal member 52 are aligned by cutting in the second step. Therefore, it is effective to carry out the fourth step at least between the second step and the third step.

Further, in the method of manufacturing the power storage module 12, the jig A for laminating and the jig B for cutting may be the same jig between the first step and the second step. Further, between the second step and the third step, the jig B for cutting and the jig D for injection molding may be the same jig. Even in these aspects, a fourth step of temporarily fixing the sealing members 52 to each other by welding is carried out between the first step and the second step, and between the second step and the third step. You may. In this case, it is not necessary to transfer the laminated body 30 between the steps, and the sealing members 52 are temporarily fixed to each other, so that the effect of suppressing the misalignment of the electrode body 31 is great.

Further, in the above embodiment, an example in which an ultrasonic cutter is used for cutting the seal member 52 is given in the second step. However, the sealing member 52 can be cut by any other method. For example, the seal member 52 may be cut by irradiation with a laser beam (by laser cutting), or the seal member 52 may be cut by using a cutting tool or the like (for example, a shear cutting machine).

Further, in the above embodiment, a case where the seal member 54 is provided on the seal member 52 by injection molding in the third step has been illustrated. However, for example, the seal member 54 may be provided on the seal member 52 by using heat. More specifically, the seal member 54 may be prepared, and the surface of the seal member 54 on the seal member 52 side may be melted by heat and the melted portion may be brought into contact with the seal member 52. That is, in the third step, the seal members 52 may be sealed to each other by joining the seal members 54 to the end portion 52q by heating. For heating the seal member 54, for example, a hot plate, hot air, or the like can be used.

Further, in the third step, the seal members 52 may be sealed with each other by melting the end portion 52q of the seal member 52 without using another seal member 54. In this case, for example, the hot plate may be pressed against the end portion 52q of the seal member 52 to melt the end portion 52q. Further, the material of the seal member 52 and the material of the seal member 54 do not have to be the same as each other.

It should be noted that the fact that the end portions 52q of the sealing member 52 after cutting in the second step are aligned means that at least the end portions 52q adjacent to each other along the stacking direction D1 are at least aligned with each other for the purpose of suppressing poor filling of the sealing material. All you have to do is have them. Therefore, for example, the end portion 52q may be gradually displaced along the stacking direction D1. In this case, tentatively, the end 52q on one end side of the stacking direction D1 in the laminated body 30 and the end 52q on the other end side of the stacking direction D1 in the laminated body 30 are in accordance with the above definition. It can be assumed that they are not aligned with each other.

12 ... Storage module, 30 ... Laminated body, 31 ... Electrode body, 32 ... Bipolar electrode, 34 ... Electrode plate (metal foil), 34e ... Outer edge, 36 ... Positive electrode (positive electrode active material layer), 38 ... Negative electrode (negative electrode active material) Layer), 52 ... Seal member (first seal member), 52w ... End, 52q ... End (new end), 54 ... Seal member (second seal member).

Claims (6)

A bipolar electrode including a metal foil, a positive electrode active material layer provided on one surface of the metal foil, and a negative electrode active material layer provided on the other surface of the metal foil, and a frame shape along the outer edge of the metal foil. A plurality of electrode bodies including the first sealing member provided on the metal foil and extending to the outside of the metal foil are laminated so that the bipolar electrodes overlap each other and the first sealing members overlap each other. 1 step and
After the first step, a second step of collectively cutting the ends extending to the outside of the metal leaf of the plurality of first seal members arranged so as to overlap in the stacking direction of the electrode bodies.
After the second step, a third step of sealing the first sealing members adjacent to each other along the stacking direction, and
A method of manufacturing a power storage module comprising. Between the second step and the third step, a fourth step of temporarily fixing the plurality of first seal members to each other by welding is provided.
The method for manufacturing a power storage module according to claim 1. In the third step, a plurality of the first sealing members are sealed with each other by using the second sealing member.
The method for manufacturing a power storage module according to claim 1 or 2. In the third step, the heated second seal member is joined to the cut surface formed by collectively cutting the ends of the plurality of first seal members in the stacking direction. Seal the first sealing members adjacent to each other along the line.
The method for manufacturing a power storage module according to claim 3. In the third step, the second seal member is provided by injection molding on the cut surface formed by cutting the ends of the plurality of first seal members at once, so that the second seal member is provided along the stacking direction. Seals the first sealing members adjacent to each other.
The method for manufacturing a power storage module according to claim 3. In the second step, an ultrasonic cutter is used to collectively cut the ends of the first seal member laminated in the stacking direction.
The method for manufacturing a power storage module according to any one of claims 1 to 5.

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