JP2018101486A - Power storage module and method for manufacturing power storage module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a power storage module by which an adequately wide sealing surface can be ensured outside a liquid-pouring spout in a lamination direction of a bipolar electrode; and a method for manufacturing the power storage module.SOLUTION: A power storage module 12 comprises: a laminate 30 in which bipolar electrodes 32 each including an electrode plate 34, a positive electrode 36 and a negative electrode 38 are laminated on one another; and a frame 50 holding edge parts 34a of the electrode plates 34 at a side face 30a of the laminate 30 extending in a lamination direction of the bipolar electrodes 32. The frame 50 has a side face 50s extending in the lamination direction. The side face 50s of the frame 50 has a main body region 50s1 and a protruding region 50s2. The main body region 50s1 has a liquid-pouring spout 50a provided therein for injecting an electrolyte solution into the frame 50. The main body region 50s1 has an edge E extending in a direction crossing the lamination direction. The protruding region 50s2 protrudes from the edge E so as to bear off from the liquid-pouring spout 50a in the lamination direction.SELECTED DRAWING: Figure 4

Description

  One aspect of the present invention relates to a power storage module and a method for manufacturing the power storage module.

  A bipolar battery having a laminate in which a bipolar electrode including an electrode plate, a positive electrode provided on one surface of the electrode plate, and a negative electrode provided on the other surface of the electrode plate is laminated is known (for example, Patent Documents). 1). In this bipolar battery, the laminate is surrounded by a resin sealing material (frame). The sealing material has an opening for injecting an electrolytic solution. The electrolyte is injected from the opening using a tube or nozzle.

JP 2012-234823 A

  When injecting the electrolytic solution, for example, the electrolytic solution in a state in which a seal (airtight) is ensured between the electrolytic solution supply pipe such as a tube or a nozzle and the peripheral region of the liquid injection port provided on the side surface of the frame body Can be injected into the frame. In order to inject the electrolytic solution into each space between adjacent bipolar electrodes, the liquid injection port extends in the lamination direction of the bipolar electrodes on the side surface of the frame. As a result, since the liquid injection port is located close to the edge of the side surface of the frame body in the stacking direction, the outer region of the liquid injection port in the stacking direction (the region between the side edge of the frame body and the liquid injection port) is narrow. Become. Therefore, a sufficiently wide sealing surface cannot be secured outside the liquid injection port in the stacking direction. Therefore, for example, a seal between the supply pipe and the inner wall of the liquid injection port is secured by inserting the supply pipe into the liquid injection port. In such a case, in order to insert the supply pipe into the liquid injection port, it is necessary to adjust the position between the supply pipe and the liquid injection port.

  An object of one aspect of the present invention is to provide a power storage module and a method for manufacturing a power storage module that can ensure a sufficiently wide sealing surface outside a liquid injection port in the stacking direction of bipolar electrodes.

  An electricity storage module according to one aspect of the present invention is a laminate in which a bipolar electrode including an electrode plate, a positive electrode provided on one surface of the electrode plate, and a negative electrode provided on the other surface of the electrode plate is laminated. And a frame body that holds the edge of the electrode plate on the side surface of the multilayer body that extends in the stacking direction of the bipolar electrode, and the frame body has a side surface that extends in the stacking direction. The side surface of the frame body has a main body region and a protruding region, and the main body region is provided with a liquid injection port for injecting an electrolyte into the frame body. Has an edge extending in a direction crossing the stacking direction, and the protruding region protrudes from the edge so as to be separated from the liquid injection port in the stacking direction.

  In this power storage module, a protruding region is located outside the liquid injection port in the bipolar electrode stacking direction. This protruding area functions as a sealing surface. Therefore, a sufficiently wide sealing surface can be secured outside the liquid injection port in the bipolar electrode stacking direction.

  The side surface of the frame body may have a rectangular shape when viewed from the stacking direction, and the liquid injection port may be provided at the center of one side of the rectangular shape.

  In this case, when the electrolytic solution supply pipe is pressed against the side surface of the frame body, the supply pipe is pressed to the center of one side of the rectangular shape. Therefore, the pressure distribution by the supply pipe on one side of the rectangular shape is substantially symmetric with respect to the center of the one side.

  The frame includes a first resin portion that holds the edge portion of the electrode plate, and a second resin portion that is provided around the first resin portion as viewed from the stacking direction and has the side surface of the frame. The liquid injection port has a first opening provided in the first resin portion and a second opening provided in the second resin portion, and the first opening is You may connect with the space between the said adjacent bipolar electrodes, and the said 2nd opening.

  In this case, the electrolytic solution is injected from the second opening into the frame through the first opening.

  A method for manufacturing a power storage module according to one aspect of the present invention includes a bipolar electrode including an electrode plate, a positive electrode provided on one surface of the electrode plate, and a negative electrode provided on the other surface of the electrode plate. A method for manufacturing a module, comprising: a step of stacking the bipolar electrodes to obtain a stacked body; and a frame body that holds an edge portion of the electrode plate on a side surface of the stacked body extending in the stacking direction of the bipolar electrodes. And a step of injecting an electrolytic solution into the frame from a liquid injection port provided in the frame, and the side surface of the frame extending in the stacking direction includes a main body region and a protruding region. The liquid injection port is provided in the main body region, the main body region has an edge extending in a direction intersecting the stacking direction, and the protruding region is Away from the injection port in the stacking direction The projects from the edge, in the step of injecting the electrolyte solution, injecting the electrolyte solution while pressing the supply pipe of the electrolyte to the projected area.

  Note that a part of the frame body may be formed before the stacking step, and the existing portion of the frame body may be formed in the frame body forming step.

  In this manufacturing method, in the step of injecting the electrolytic solution, the protruding region is located outside the liquid injection port in the bipolar electrode stacking direction. This protruding area functions as a sealing surface. Therefore, a sufficiently wide sealing surface can be secured outside the liquid injection port in the bipolar electrode stacking direction. By pressing the electrolyte supply pipe against the protruding region, a seal between the supply pipe and the peripheral area of the liquid injection port can be secured.

  The frame includes a first resin portion that holds the edge portion of the electrode plate, and a second resin portion that is provided around the first resin portion as viewed from the stacking direction and has the side surface of the frame. In the step of forming the frame body, the second resin part may be formed by injection molding, and the resin material of the second resin part may flow in a direction crossing the laminating direction.

  In this case, the side surface of the frame is formed by solidifying the resin material of the second resin portion. When the second resin portion is formed, the protruding region is formed by the resin material of the second resin portion flowing outside the liquid injection port in the stacking direction. If the side surface of the frame has a protruding region, the resin material of the second resin portion can flow more easily by the width of the protruding region in the stacking direction than when there is no protruding region.

  According to one aspect of the present invention, it is possible to provide a power storage module and a method for manufacturing the power storage module that can ensure a sufficiently wide sealing surface outside the liquid injection port in the stacking direction of the bipolar electrodes.

It is a schematic sectional drawing which shows one Embodiment of an electrical storage apparatus provided with an electrical storage module. It is a schematic sectional drawing which shows the electrical storage module which comprises the electrical storage apparatus of FIG. It is a schematic perspective view which shows the electrical storage module of FIG. FIG. 4 is an enlarged plan view of a part of the power storage module of FIG. 3. It is a schematic sectional drawing which shows an example of the lamination process in the manufacturing method of the electrical storage module of FIG. It is a schematic sectional drawing which shows the frame formation process in the manufacturing method of the electrical storage module of FIG. It is a schematic sectional drawing which shows the electrolyte solution injection | pouring process in the manufacturing method of the electrical storage module of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and redundant descriptions are omitted. In the drawing, an XYZ orthogonal coordinate system is shown.

[Configuration of power storage device]
FIG. 1 is a schematic cross-sectional view illustrating an embodiment of a power storage device including a power storage module. The power storage device 10 shown in the figure is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 10 includes a plurality (three in the present embodiment) of 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 hydride 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 is illustrated.

  The plurality of power storage modules 12 can be stacked via a conductive plate 14 such as a metal plate. When viewed from the stacking direction, 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 outside the power storage modules 12 positioned at both ends in the stacking direction (Z direction) of the power storage modules 12. The conductive plate 14 is electrically connected to the adjacent power storage module 12. Thereby, the some electrical storage module 12 is connected in series in the lamination direction. In the stacking direction, a positive electrode terminal 24 is connected to the conductive plate 14 located at one end, and a negative electrode terminal 26 is connected to the conductive plate 14 located at the other end. The positive 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 direction) intersecting the stacking direction. The positive and negative terminals 24 and 26 can charge and discharge the power storage device 10.

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

  The power storage device 10 may include a restraining member 16 that restrains the alternately stacked power storage modules 12 and conductive plates 14 in the stacking direction. The restraining member 16 includes a pair of restraining plates 16A and 16B and a connecting member (bolt 18 and nut 20) for joining the restraining plates 16A and 16B to each other. An insulating film 22 such as a resin film is disposed between the restraining plates 16A and 16B and the conductive plate. Each restraint plate 16A, 16B is comprised, for example with metals, such as iron. When viewed from the stacking direction, each of the restraining plates 16A and 16B and the insulating film 22 has, for example, a rectangular shape. The insulating film 22 is larger than the conductive plate 14, and the restraining plates 16 </ b> A and 16 </ b> B are larger than the power storage module 12. When viewed from the stacking direction, an insertion hole 16A1 through which the shaft portion of the bolt 18 is inserted is provided at a position on the outer side of the power storage module 12 at the edge portion of the restraint plate 16A. Similarly, an insertion hole 16 </ b> B <b> 1 through which the shaft part of the bolt 18 is inserted is provided at a position on the outer side of the power storage module 12 at the edge of the restraint plate 16 </ b> B when viewed from the stacking direction. When each restraint plate 16A, 16B has a rectangular shape when viewed from the stacking direction, the insertion hole 16A1 and the insertion hole 16B1 are located at the corners of the restraint plates 16A, 16B.

  One constraining plate 16A is abutted against the conductive plate 14 connected to the negative terminal 26 via the insulating film 22, and the other constraining plate 16B has the insulating film 22 applied to the conductive plate 14 connected to the positive terminal 24. Has been hit through. For example, the bolt 18 is passed through the insertion hole 16A1 from one restraint plate 16A side toward the other restraint plate 16B side, and a nut 20 is screwed onto the tip of the bolt 18 protruding from the other restraint plate 16B. Yes. Accordingly, the insulating film 22, the conductive plate 14, and the power storage module 12 are sandwiched and unitized, and a restraining load is applied in the stacking direction.

  2 is a schematic cross-sectional view showing a power storage module constituting the power storage device of FIG. The power storage module 12 shown in the figure includes a stacked body 30 in which a plurality of bipolar electrodes 32 are stacked. The laminated body 30 has, for example, a rectangular shape when viewed from the lamination direction of the bipolar electrode 32. A separator 40 may be disposed between the 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 stacked body 30, the positive electrode 36 of one bipolar electrode 32 faces the negative electrode 38 of one bipolar electrode 32 adjacent in the stacking direction across the separator 40, and the negative electrode 38 of one bipolar electrode 32 connects the separator 40. It faces the positive electrode 36 of the other bipolar electrode 32 that is adjacent in the stacking direction. In the laminating direction, an electrode plate 34 (negative electrode termination electrode) having a negative electrode 38 disposed on the inner surface is disposed at one end of the laminate 30 and a positive electrode 36 is disposed on the inner surface at the other end. 34 (positive terminal electrode) is disposed. The negative electrode 38 of the negative electrode-side termination electrode faces the positive electrode 36 of the uppermost bipolar electrode 32 with the separator 40 interposed therebetween. The positive electrode 36 of the positive terminal electrode is opposed to the negative electrode 38 of the lowermost bipolar electrode 32 with the separator 40 interposed therebetween. The electrode plates 34 of these termination electrodes are connected to the adjacent conductive plates 14 (see FIG. 1).

  The power storage module 12 includes a frame body 50 that holds the edge portion 34 a of the electrode plate 34 on the side surface 30 a of the stacked body 30 that extends in the stacking direction of the bipolar electrodes 32. The frame body 50 is configured to surround the side surface 30 a of the stacked body 30. The side surface 50 s has, for example, a rectangular shape when viewed from the lamination direction of the bipolar electrode 32. In this case, the side surface 50s is composed of four rectangular surfaces. The frame 50 can include a first resin portion 52 that holds the edge portion 34a of the electrode plate 34 and a second resin portion 54 that is provided around the first resin portion 52 when viewed from the stacking direction.

  The first resin portion 52 constituting the inner wall of the frame 50 is provided from one surface (surface on which the positive electrode 36 is formed) of the electrode plate 34 of each bipolar electrode 32 to the end surface of the electrode plate 34 at the edge portion 34a. . When viewed from the stacking direction of the bipolar electrodes 32, each first resin portion 52 is provided over the entire circumference of the edge portion 34 a of the electrode plate 34 of each bipolar electrode 32. Adjacent first resin portions 52 are welded to each other on the surface extending outside the other surface (surface on which the negative electrode 38 is formed) of the electrode plate 34 of each bipolar electrode 32. As a result, the edge portion 34 a of the electrode plate 34 of each bipolar electrode 32 is buried and held in the first resin portion 52. Similarly to the edge portion 34 a of the electrode plate 34 of each bipolar electrode 32, the edge portions 34 a of the electrode plates 34 disposed at both ends of the laminated body 30 are also held in a state of being buried in the first resin portion 52. Thus, an internal space V that is airtightly partitioned by the electrode plates 34 and 34 and the first resin portion 52 is formed between the electrode plates 34 and 34 adjacent in the stacking direction. In the internal space V, for example, an electrolytic solution (not shown) made of an alkaline solution such as an aqueous potassium hydroxide solution is accommodated.

  The second resin portion 54 constituting the outer wall of the frame body 50 is a cylindrical portion that extends over the entire length of the multilayer body 30 in the lamination direction of the bipolar electrode 32. The second resin portion 54 covers the outer surface of the first resin portion 52 extending in the stacking direction of the bipolar electrode 32. The second resin portion 54 is welded to the outer surface of the first resin portion 52 on the inner surface that extends in the stacking direction of the bipolar electrode 32.

  The electrode plate 34 is a rectangular metal foil made of nickel, for example. The edge 34 a of the electrode plate 34 is an uncoated region where the positive electrode active material and the negative electrode active material are not coated, and the uncoated region is buried in the first resin portion 52 constituting the inner wall of the frame body 50. It is an area to be held. An example of the positive electrode active material constituting the positive electrode 36 is 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.

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

  The frame 50 (the first resin portion 52 and the second resin portion 54) is formed in a rectangular cylindrical shape by, for example, injection molding using an insulating resin. Examples of the resin material constituting the frame 50 include polypropylene (PP), polyphenylene sulfide (PPS), and modified polyphenylene ether (modified PPE).

  FIG. 3 is a schematic perspective view showing the power storage module of FIG. 4 is an enlarged plan view of a part of the power storage module of FIG. As shown in FIGS. 3 and 4, the frame 50 of the power storage module 12 has side surfaces 50 s extending in the stacking direction of the bipolar electrodes 32. The side surface 50 s is a surface located on the outer side when viewed from the lamination direction of the bipolar electrode 32. Therefore, the second resin portion 54 has the side surface 50 s of the frame body 50.

  The side surface 50s of the frame 50 has a main body region 50s1 and a protruding region 50s2. Each of the main body region 50s1 and the protruding region 50s2 has a rectangular shape, for example. In the main body region 50 s 1, a liquid injection port 50 a for injecting an electrolytic solution into the frame body 50 is provided. The liquid injection port 50a is sealed with a sealing material (not shown) after the electrolyte solution is injected. The shape of the liquid injection port 50a is, for example, a rectangle, but may be another shape such as a circle. The liquid injection port 50a extends so that the lamination direction of the bipolar electrodes 32 is the longitudinal direction. The liquid injection port 50 a is provided at the center of one side of the rectangular shape of the side surface 50 s as viewed from the lamination direction of the bipolar electrode 32, but may be shifted from the center. The main body region 50 s 1 has an edge E that extends in a direction (Y direction) intersecting the stacking direction of the bipolar electrodes 32. The protruding region 50 s 2 protrudes from the edge E so as to be separated from the liquid injection port 50 a in the lamination direction of the bipolar electrode 32. In the present embodiment, the pair of projecting regions 50s2 are arranged so as to sandwich the liquid injection port 50a. The protruding region 50s2 is provided with a length that extends beyond the entire length of the liquid injection port 50a along the edge E and protrudes on both outer sides of the liquid injection port 50a.

  As shown in FIG. 4, the liquid injection port 50 a may have a first opening 52 a provided in the first resin part 52 and a second opening 54 a provided in the second resin part 54. The first opening 52a communicates with the internal space V (see FIG. 2) between the adjacent bipolar electrodes 32 and the second opening 54a. The first resin part 52 is provided with a plurality of first openings 52a, and the second resin part 54 is provided with a single second opening 54a that extends so as to cover the plurality of first openings 52a. . The first opening 52 a may be provided in each first resin portion 52, or may be provided between adjacent first resin portions 52. The shape of each first opening 52a is, for example, a circle, and the shape of the second opening 54a is, for example, a rectangle.

  As described above, the power storage module 12 of this embodiment includes the electrode plate 34, the positive electrode 36 provided on one surface of the electrode plate 34, and the negative electrode 38 provided on the other surface of the electrode plate 34. A laminated body 30 in which the electrodes 32 are laminated, and a frame body 50 that holds the edge portion 34a of the electrode plate 34 on a side surface 30a of the laminated body 30 extending in the lamination direction of the bipolar electrode 32 are provided. The frame 50 has side surfaces 50 s extending in the stacking direction of the bipolar electrodes 32. The side surface 50s has a main body region 50s1 and a protruding region 50s2. In the main body region 50 s 1, a liquid injection port 50 a for injecting an electrolytic solution into the frame body 50 is provided. The main body region 50 s 1 has an edge E extending in a direction intersecting with the stacking direction of the bipolar electrodes 32. The protruding region 50 s 2 protrudes from the edge E so as to be separated from the liquid injection port 50 a in the lamination direction of the bipolar electrode 32.

  In the power storage module 12, the protruding region 50 s 2 is located outside the liquid injection port 50 a in the stacking direction of the bipolar electrodes 32. When the electrolytic solution is injected into the frame body 50, the protruding region 50 s 2 is a region surrounding the electrolyte solution supply pipe 110 (see FIG. 7), which will be described later, and the liquid inlet 50 a provided on the side surface 50 s of the frame body 50 ( It functions as a seal surface between the portion adjacent to the liquid injection port 50a in the main body region 50s1 and the protruding region 50s2). Therefore, a sufficiently wide sealing surface can be secured on the outside of the liquid injection port 50a in the lamination direction of the bipolar electrode 32. This eliminates the need to insert the electrolyte supply pipe 110 into the liquid injection port 50a, and eliminates the need to adjust the position between the supply pipe 110 and the liquid injection port 50a.

  The side surface 50s of the frame 50 has a rectangular shape when viewed from the stacking direction of the bipolar electrode 32, and the liquid injection port 50a may be provided at the center of one side of the rectangular shape. In this case, when the electrolytic solution supply pipe 110 is pressed against the side surface 50s of the frame 50, the supply pipe 110 is pressed against the center of one side of the rectangular shape (see FIG. 7). Therefore, the pressure distribution by the supply pipe 110 on one side of the rectangular shape is substantially symmetric with respect to the center of the one side. When the liquid injection port 50a is arranged so as to be shifted from the center of one side of the rectangular shape, a jig that can apply a pressure equivalent to that of the supply pipe 110 to a position symmetrical to the position of the liquid injection port 50a with respect to the center ( (Not shown) may be arranged. Thereby, the pressure distribution by the supply pipe 110 and the jig on one side of the rectangular shape becomes substantially symmetric.

  The frame 50 is provided with a first resin portion 52 that holds the edge portion 34a of the electrode plate 34 and a first side portion 50s of the frame body 50 that is provided around the first resin portion 52 when viewed from the lamination direction of the bipolar electrode 32. 2 resin portions 54 may be provided. The liquid injection port 50a has a first opening 52a provided in the first resin portion 52 and a second opening 54a provided in the second resin portion 54, and the first opening 52a is adjacent to the bipolar. It communicates with the internal space V between the electrodes 32 and the second opening 54a. In this case, the electrolytic solution is injected into the frame body 50 from the second opening 54a via the first opening 52a.

[Method for Manufacturing Power Storage Device]
5-7 is a schematic sectional drawing which shows an example of each process in the manufacturing method of the electrical storage module which concerns on this embodiment. Hereinafter, an example of a method for manufacturing the power storage module 12 illustrated in FIG. 2 will be described.

(Lamination process)
First, as shown in FIG. 5, for example, the bipolar electrode 32 is stacked via the separator 40 to obtain the stacked body 30. In the present embodiment, the first resin portion 52 is formed on the edge portion 34a of the electrode plate 34 of each bipolar electrode 32 by, for example, injection molding before the lamination step.

(Frame forming process)
Next, the second resin portion 54 is formed by, for example, injection molding (see FIG. 2). As shown in FIG. 6, the second resin portion 54 is formed by pouring the resin material 54 </ b> P of the second resin portion 54 having fluidity into the mold M. As a result, as shown in FIGS. 3 and 4, the frame body 50 having the first resin portion 52 and the second resin portion 54 is formed. The mold M is a nest for forming a first portion M1 that forms the outer edge of the main body region 50s1 and the protruding region 50s2 (see FIG. 4) on the side surface 50s of the frame body 50, and a second opening 54a of the liquid injection port 50a. A second portion M2. The resin material 54 </ b> P of the second resin portion 54 flows in a direction crossing the lamination direction of the bipolar electrode 32. For example, after the resin material 54P of the second resin portion 54 flows between the pair of first portions M1 that are arranged to face each other, the resin material 54P collides with the second portion M2, and the two resin materials 54P along the periphery of the second portion M2. Divided into The resin material 54P of the second resin portion 54 divided into two flows between the first portion M1 and the second portion M2, respectively, and then merges to flow between the pair of first portions M1.

  In the present embodiment, the first resin portion 52 that is a part of the frame 50 is formed before the lamination step, and the second resin portion 54 that is the remaining portion of the frame 50 is formed after the lamination step. You may form the 1st resin part 52 which is a part of frame 50 after a process.

(Electrolyte injection process)
Next, as shown in FIG. 7, an electrolytic solution is injected into the frame 50 from a liquid injection port 50 a provided in the frame 50. The electrolytic solution is injected while pressing the electrolytic solution supply pipe 110 against a region around the liquid injection port 50 a on the side surface 50 s of the frame 50. This peripheral region includes a portion adjacent to the liquid injection port 50a in the main body region 50s1 shown in FIG. 4 and a protruding region 50s2.

  The injection of the electrolytic solution is performed using the injection device 100. The injection device 100 includes a supply pipe 110 and a jig 120 that holds the supply pipe 110 and the frame body 50. The supply pipe 110 includes a supply pipe main body 112, an attachment 114 that surrounds the distal end of the supply pipe main body 112, and a packing 116 that is disposed between the attachment 114 and the side surface 50 s of the frame body 50. The jig 120 connects the plate-like member 122 that supports the side surface of the frame 50 opposite to the side surface 50 s, the plate-like member 124 disposed opposite to the plate-like member 122, and the plate-like members 122, 124. And a pair of columnar members 126. A supply pipe 110 is fixed to the plate member 124. Each columnar member 126 is fixed to the plate-like member 122 and connected to the plate-like member 124 by a bolt 108 that penetrates the plate-like member 124 in the plate thickness direction. The tip of the bolt 108 is inserted into an insertion hole provided in the upper surface of the columnar member 126 and screwed. By tightening the bolt 108, the packing 116 of the supply pipe 110 fixed to the plate member 124 can be pressed against the side surface 50 s of the frame body 50.

  The supply pipe body 112 is a cylindrical member that penetrates the plate member 124 in the plate thickness direction. The attachment 114 is a cylindrical member that is fixed to the plate-like member 124 and is disposed between the plate-like member 124 and the side surface 50 s of the frame body 50. One end of the supply pipe 110 is located in the liquid injection port 50a, and the other end is located on the outer surface of the plate-like member 124 (the surface on which the attachment 114 is not disposed). The other end of the supply pipe 110 is connected to the valve V1 by a pipe. The valve V1 is connected to the dispenser D by piping through a tank T that stores an electrolytic solution. The tank T is disposed between the dispenser D and the valve V1. The pipe between the other end of the supply pipe 110 and the valve V1 is branched in the middle and is also connected to the valve V2. The valve V2 is connected to the vacuum pump P via the vacuum gauge G. The other end of the supply pipe 110 may be connectable to a pressure tester of the power storage module 12.

  The injection of the electrolytic solution is performed using the injection device 100 as follows, for example. First, the vacuum pump P is operated with the valve V2 opened and the valve V1 closed. Thereby, air is discharged | emitted from the internal space V (refer FIG. 2) in the frame 50. FIG. Thereafter, when the valve V2 is closed and the valve V1 is opened, the electrolytic solution supplied from the dispenser D and stored in the tank T is injected into the internal space V in the frame 50.

  After passing through the above steps, the liquid inlet 50a is sealed with a sealing material, whereby the power storage module 12 shown in FIG. 2 is manufactured. Thereafter, as shown in FIG. 1, a plurality of power storage modules 12 are stacked via the conductive plate 14. A positive electrode terminal 24 and a negative electrode terminal 26 are connected in advance to the conductive plates 14 located at both ends in the stacking direction. Thereafter, a pair of restraining plates 16A and 16B are disposed at both ends in the stacking direction via the insulating film 22, respectively. Thereafter, the shaft portion of the bolt 18 is inserted into the insertion hole 16A1 of the restraining plate 16A, and is inserted into the insertion hole 16B1 of the restraining plate 16B. Thereafter, the nut 20 is screwed onto the tip of the bolt 18 protruding from the restraining plate 16B. In this way, the power storage device 10 shown in FIG. 1 is manufactured.

  As described above, the method for manufacturing the power storage module according to the present embodiment includes the stacking process, the frame forming process, and the electrolyte injection process. In this manufacturing method, in the electrolytic solution injection step, the protruding region 50s2 is located outside the liquid injection port 50a in the lamination direction of the bipolar electrode 32. The protruding region 50s2 functions as a seal surface. Therefore, a sufficiently wide sealing surface can be secured on the outside of the liquid injection port 50a in the lamination direction of the bipolar electrode 32. By pressing the electrolyte supply pipe 110 against the protruding area 50s2, a seal between the supply pipe 110 and the area around the liquid injection port 50a can be secured.

  In the frame forming step, the second resin portion 54 may be formed by injection molding, and the resin material 54P of the second resin portion 54 may flow in a direction intersecting the lamination direction of the bipolar electrodes 32. In this case, the side surface 50s of the frame 50 is formed by the solidification of the resin material 54P of the second resin portion 54. When the second resin portion 54 is formed, the resin material 54P of the second resin portion 54 flows outside the liquid injection port 50a in the stacking direction of the bipolar electrode 32, whereby the protruding region 50s2 is formed. When the side surface 50 s of the frame 50 has the protruding region 50 s 2, the resin material of the second resin portion 54 is equal to the width of the protruding region 50 s 2 in the stacking direction of the bipolar electrode 32 compared to the case where the protruding region 50 s 2 is not provided. 54P becomes easy to flow.

  As mentioned above, although preferred embodiment of this invention was described in detail, this invention is not limited to the said embodiment.

  DESCRIPTION OF SYMBOLS 12 ... Power storage module, 30 ... Laminated body, 30a ... Side surface, 32 ... Bipolar electrode, 34 ... Electrode plate, 34a ... Edge part, 36 ... Positive electrode, 38 ... Negative electrode, 50 ... Frame, 50a ... Injection hole, 50s ... Side surface, 50s1 ... main body region, 50s2 ... projecting region, 52 ... first resin part, 52a ... first opening, 54 ... second resin part, 54a ... second opening, 54P ... resin material, 110 ... supply pipe, E ... Edge, V ... Internal space.

Claims (5)

A laminate in which a bipolar electrode including an electrode plate, a positive electrode provided on one surface of the electrode plate, and a negative electrode provided on the other surface of the electrode plate is laminated;
A frame that holds the edge of the electrode plate on the side surface of the laminate extending in the lamination direction of the bipolar electrode;
With
The frame has side surfaces extending in the stacking direction,
The side surface of the frame has a main body region and a protruding region,
The main body region is provided with a liquid injection port for injecting an electrolyte into the frame, and the main body region has an edge extending in a direction intersecting the stacking direction,
The power storage module, wherein the protruding region protrudes from the edge so as to be separated from the liquid injection port in the stacking direction. The side surface of the frame body has a rectangular shape when viewed from the stacking direction,
The power storage module according to claim 1, wherein the liquid injection port is provided at a center of one side of the rectangular shape. The frame includes a first resin portion that holds the edge portion of the electrode plate, and a second resin portion that is provided around the first resin portion as viewed from the stacking direction and has the side surface of the frame. With
The liquid injection port has a first opening provided in the first resin part and a second opening provided in the second resin part,
The power storage module according to claim 1, wherein the first opening communicates with a space between the adjacent bipolar electrodes and the second opening. A method of manufacturing an electricity storage module having a bipolar electrode including an electrode plate, a positive electrode provided on one surface of the electrode plate, and a negative electrode provided on the other surface of the electrode plate,
Laminating the bipolar electrodes to obtain a laminate;
Forming a frame that holds the edge of the electrode plate on the side surface of the laminate extending in the lamination direction of the bipolar electrode;
Injecting an electrolyte into the frame from a liquid injection port provided in the frame;
Including
The side surface of the frame extending in the stacking direction has a main body region and a protruding region,
In the main body region, the liquid injection port is provided, and the main body region has an edge extending in a direction intersecting the stacking direction,
The protruding region protrudes from the edge so as to be separated from the liquid injection port in the stacking direction,
In the step of injecting the electrolytic solution, the electrolytic solution is injected while pressing the electrolytic solution supply pipe against the protruding region. The frame includes a first resin portion that holds the edge portion of the electrode plate, and a second resin portion that is provided around the first resin portion as viewed from the stacking direction and has the side surface of the frame. With
5. The power storage module according to claim 4, wherein in the step of forming the frame body, the second resin portion is formed by injection molding, and the resin material of the second resin portion flows in a direction intersecting the stacking direction. Method.

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