JP6834638B2 - Manufacturing method of liquid injection jig and power storage module - Google Patents

Description

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

A power storage module (bipolar battery) having a laminate in which a bipolar electrode (battery cell) 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. It is known (for example, Patent Document 1). In the power storage module, the laminated body is surrounded by a resin sealing material (frame body), and a liquid injection port is provided for injecting an electrolytic solution into each internal space formed by adjacent bipolar electrodes. There is. In the manufacturing process of such a power storage module, the electrolytic solution may be injected into a plurality of injection ports at once.

Japanese Unexamined Patent Publication No. 2012-234823

It is difficult to inject a specified amount of electrolytic solution into each internal space by the conventional method of injecting an electrolytic solution into a plurality of injection ports at once. Therefore, it is conceivable to connect a liquid injection device that injects a specified amount of electrolytic solution into each of a plurality of liquid injection ports via a joint portion. However, since the distance between the internal spaces adjacent to each other is very narrow, it is not possible to arrange a joint portion having a relatively large size with respect to the communication passage connected to the adjacent liquid injection port, and the joint portion is arranged. It is inferior in workability, for example, it is necessary to maintain an interval for the work.

An object of the present invention is to provide a method for manufacturing a liquid injection jig and a power storage module capable of improving workability when injecting an electrolytic solution into each liquid injection port.

The liquid injection jig according to the present invention is a laminated body 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 an electrode. The electrolytic solution is injected into a power storage module provided with a frame body that holds the edge of the plate and is provided with a plurality of liquid injection ports that communicate with each of a plurality of internal spaces between adjacent bipolar electrodes in the laminated body. A liquid injection jig used for this purpose, which has a plurality of first openings provided corresponding to a plurality of liquid injection ports, and is pressed against a frame when the electrolytic solution is injected. A joint portion having a plurality of second openings provided corresponding to the plurality of first openings and connected to a liquid injection device connected at the time of liquid injection, and a first opening and a second opening. The distance between the second openings that are adjacent to each other is longer than the distance between the first openings that are adjacent to each other.

In the above-mentioned liquid injection jig, since the distance between the second openings is longer than the distance between the liquid injection ports provided in the power storage module, a joint having a size relatively large compared to the distance between the liquid injection ports is connected. It will be possible to install it for each passage. Then, with a simple operation of pressing this liquid injection jig against the side surface of the power storage module provided with the liquid injection port, the liquid injection port communicating with the internal space of the frame and the liquid injection device for injecting the electrolytic solution Can be connected. As a result, workability when injecting the electrolytic solution at each injection port can be improved.

In the liquid injection jig according to the present invention, the communication passage may have a bent portion that bends between the first opening and the second opening. With this liquid injection jig, the distance between the second openings adjacent to each other can be widened with a simple configuration, and the joint portion can be positioned in a direction that makes it easy to connect to the liquid injection device. As a result, workability when injecting the electrolytic solution into each injection port can be further improved.

In the liquid injection jig according to the present invention, the distance between the communication passages adjacent to each other on the second opening side of the bent portion is larger than the distance between the communication passages adjacent to each other on the first opening side of the bending portion. It may be long. With this liquid injection jig, the distance between the second openings adjacent to each other can be made longer than the distance between the first openings adjacent to each other with a simple configuration.

In the liquid injection jig according to the present invention, the communication passage may be formed in a straight line between the first opening and the second opening. With this liquid injection jig, it is possible to maintain a good flow of the electrolytic solution at the time of injecting the electrolytic solution.

In the liquid injection jig according to the present invention, the opening directions of the plurality of second openings may be the same. With this liquid injection jig, the connection with the liquid injection device becomes easy.

The method for manufacturing a power storage module according to the present invention includes a laminated body 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 method for manufacturing a power storage module including a frame body that holds the edge of an electrode plate and is provided with a plurality of liquid injection ports that communicate with each of a plurality of internal spaces between adjacent bipolar electrodes in a laminated body. In the preparatory step of preparing the above-mentioned liquid injection jig, the supply path and the joint portion communicating with the storage portion in which the electrolytic solution is stored in the liquid injection device are connected, and the liquid injection port and the first opening are connected. An installation process for connecting, a vacuum state forming step for forming a vacuum state in a plurality of internal spaces which are spaces between electrode plates adjacent to each other, and an electrolytic solution in the internal space due to the pressure difference between the internal space in the vacuum state and the storage portion. Has an injection step of injecting.

The manufacturing method of this power storage module is a simple operation of pressing the above liquid injection jig against the opening of the power storage module, and the electrolytic solution is injected into each first opening communicating with the internal space of the frame. Can be connected to a liquid device. As a result, workability when injecting the electrolytic solution at each injection port can be improved.

According to the present invention, it is possible to improve workability when injecting an electrolytic solution at each injection port.

It is the schematic sectional drawing which shows one Embodiment of the power storage device. It is schematic cross-sectional view which shows the power storage module included in the power storage device of FIG. It is a schematic perspective view which shows the power storage module of FIG. It is an enlarged plan view of a part of the power storage module of FIG. It is sectional drawing which follows the communication direction of the liquid injection jig used for liquid injection to the power storage module of FIG. It is a top view of the liquid injection jig of FIG. It is a perspective view of the liquid injection jig of FIG. It is a flowchart which shows one Embodiment of the manufacturing method of the power storage device of FIG. It is a schematic diagram which shows the structure at the time of injecting an electrolytic solution into a power storage module. It is a perspective view which shows an example of the state which the liquid injection jig is installed in the power storage module.

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 duplicate description is omitted. 1 to 4 show an XYZ Cartesian coordinate system.

The power storage device 10 shown in FIG. 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage module 12 is, for example, a bipolar battery. Examples of the power storage module 12 include a secondary battery such as a nickel hydrogen secondary battery and a lithium ion secondary battery, but may be an electric double layer capacitor. In the following description, a nickel hydrogen secondary battery will be illustrated.

The plurality of power storage modules 12 are laminated via a conductor 14 such as a metal plate to form an array 11. The conductor 14 is one metal body arranged between the electricity storage modules 12 and 12 adjacent to each other, and is arranged in contact with both the electricity storage modules 12 and 12 adjacent to each other. The conductor 14 is formed of, for example, a metal material such as aluminum or copper. When the conductor 14 is viewed from the stacking direction (Z direction), the power storage module 12 and the conductor 14 have, for example, a rectangular shape. When viewed from the stacking direction, the conductor 14 is smaller than the power storage module 12, but may be the same as or larger than the power storage module 12. In other words, the conductor 14 is arranged in the region where the power storage module 12 is arranged when viewed from the stacking direction. The conductor 14 is electrically connected to the adjacent power storage module 12. As a result, the plurality of power storage modules 12 are connected in series in the stacking direction.

The conductors 14 are also arranged on the outside of the power storage modules 12 located at both ends in the stacking direction of the power storage modules 12. That is, the conductors 14 are also arranged at both ends of the array 11 in the stacking direction. In the stacking direction, the positive electrode terminal 24 is connected to the conductor 14 located at one end, and the negative electrode terminal 26 is connected to the conductor 14 located at the other end. The positive electrode terminal 24 may be integrated with the conductor 14 to be connected. The negative electrode terminal 26 may be integrated with the conductor 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 electrode terminal 24 and the negative electrode terminal 26 can be used to charge and discharge the power storage device 10.

The conductor 14 also functions as a heat radiating plate for releasing the heat generated in the power storage module 12. Inside the conductor 14, a through hole 14a extending in a direction (Y direction) intersecting the stacking direction is provided. The through hole 14a communicates with the conductor 14 from one side surface facing each other to the other side surface. The through holes 14a are arranged in the stacking direction and the direction intersecting the stacking direction (X direction). By passing a gaseous refrigerant such as air through such a through hole 14a, the heat generated in the power storage module 12 can be efficiently released to the outside. The size of the conductor 14, the material of the conductor 14, the size of the through holes 14a, the number of through holes 14a, and the like are appropriately adjusted so that the temperature of the power storage device 10 does not exceed 50 ° C., for example. The power storage module 12 may be provided with a device for actively circulating (circulating) air through the through hole 14a.

The power storage device 10 may include a restraint member 15 that restrains the alternately stacked power storage modules 12 and the conductor 14 in the stacking direction. The restraint member 15 includes a pair of restraint plates 16 and 17 and a connecting member (bolt 18 and nut 20) for connecting the restraint plates 16 and 17 to each other. An insulating film 22 such as a resin film is arranged between the restraint plates 16 and 17 and the conductor 14. The restraint plates 16 and 17 are made of, for example, a metal such as iron.

When viewed from the stacking direction, the restraint plates 16 and 17 and the insulating film 22 have, for example, a rectangular shape. The insulating film 22 is larger than the conductor 14, and the restraint plates 16 and 17 are larger than the power storage module 12. When viewed from the stacking direction, an insertion hole 16a 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 16. Similarly, when viewed from the stacking direction, an insertion hole 17a 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 17. When the restraint plates 16 and 17 have a rectangular shape when viewed from the stacking direction, the insertion holes 16a and the insertion holes 17a are located at the corners of the restraint plates 16 and 17.

One restraint plate 16 is abutted against the conductor 14 connected to the negative electrode terminal 26 via the insulating film 22, and the other restraint plate 17 has the insulating film 22 attached to the conductor 14 connected to the positive electrode terminal 24. It is struck through. For example, the bolt 18 is passed through the insertion hole 16a from one restraint plate 16 side toward the other restraint plate 17, and a nut 20 is screwed into the tip of the bolt 18 protruding from the other restraint plate 17. ing. As a result, the insulating film 22, the conductor 14, and the power storage module 12 are sandwiched and unitized, and a restraining load is applied in the stacking direction.

As shown in FIG. 2, the power storage module 12 includes a laminated body 30 in which a plurality of bipolar electrodes 32 are laminated. When viewed from the stacking direction of the bipolar electrodes 32, the laminated body 30 has, for example, a rectangular shape. A separator 40 may be arranged between adjacent bipolar electrodes 32. The bipolar electrode 32 includes an electrode plate 34, a positive electrode layer 36 provided on one surface of the electrode plate 34, and a negative electrode layer 38 provided on the other surface of the electrode plate 34. In the laminated body 30, the positive electrode layer 36 of one bipolar electrode 32 faces the negative electrode layer 38 of one of the bipolar electrodes 32 adjacent to each other in the stacking direction with the separator 40 interposed therebetween, and the negative electrode layer 38 of one bipolar electrode 32 is It faces the positive electrode layer 36 of the other bipolar electrode 32 that is adjacent to each other in the stacking direction with the separator 40 in between.

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

The power storage module 12 includes a frame body 50 that holds the edge portion 34a of the electrode plate 34 on the side surface 30a of the laminated body 30 extending in the stacking direction of the bipolar electrodes 32. The frame body 50 is configured to surround the side surface 30a of the laminated body 30. The side surface 51 of the frame body 50 has, for example, a rectangular shape when viewed from the stacking direction of the bipolar electrodes 32. In this case, the side surface 51 is composed of four rectangular surfaces. The frame body 50 may 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 body 50 is provided from one surface of the electrode plate 34 of each bipolar electrode 32 (the surface on which the positive electrode layer 36 is formed) to the end surface of the electrode plate 34 at the edge portion 34a. There is. 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 34a of the electrode plate 34 of each bipolar electrode 32. The adjacent first resin portions 52 are welded to each other on a surface extending outside the other surface (the surface on which the negative electrode layer 38 is formed) of the electrode plate 34 of each bipolar electrode 32. As a result, the edge portion 34a of the electrode plate 34 of each bipolar electrode 32 is buried and held in the first resin portion 52. Similar to the edge 34a of the electrode plate 34 of each bipolar electrode 32, the edge 34a of the electrode plates 34 arranged at both ends of the laminated body 30 is also held in a state of being buried in the first resin portion 52. As a result, an internal space V airtightly partitioned by the electrode plates 34, 34 and the first resin portion 52 is formed between the electrode plates 34, 34 adjacent to each other in the stacking direction. An electrolytic solution (not shown) composed of an alkaline solution such as an aqueous potassium hydroxide solution is housed in the internal space V.

The second resin portion 54 constituting the outer wall of the frame body 50 is a tubular portion extending over the entire length of the laminated body 30 in the stacking 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 electrode plate 34 is, for example, a rectangular metal leaf made of 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 first resin portion 52 constituting the inner wall of the frame body 50. It is an area that is held. An example of the positive electrode active material constituting the positive electrode layer 36 includes nickel hydroxide. Examples of the negative electrode active material constituting the negative electrode layer 38 include a hydrogen storage alloy. The formation region of the negative electrode layer 38 on the other surface of the electrode plate 34 is slightly larger than the formation region of the positive electrode layer 36 on one surface of the electrode plate 34. The electrode plate 34 may be formed of a conductive resin.

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 made of polypropylene, methyl cellulose and the like, and a non-woven fabric. Further, the separator 40 may be reinforced with a vinylidene fluoride resin compound.

The frame body 50 (first resin portion 52 and second resin portion 54) is formed in a rectangular tubular 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), modified polyphenylene ether (modified PPE), and the like.

As shown in FIGS. 3 and 4, the frame 50 of the power storage module 12 has a side surface 51 extending in the stacking direction of the bipolar electrodes 32. The side surface 51 is a surface located on the outside when viewed from the stacking direction of the bipolar electrodes 32. Therefore, the second resin portion 54 has the side surface 51 of the frame body 50.

The side surface 51 is provided with a liquid injection unit 55 for injecting the electrolytic solution into the frame body 50. The liquid injection portion 55 has a liquid injection port portion 55a and a protruding portion 55b. The liquid injection port portion 55a communicates with the outside and the inside of the frame body 50. As shown in FIG. 4, the liquid injection port 55a includes a first liquid injection port (liquid injection port) 52a provided in the first resin part 52 and a second liquid injection provided in the second resin part 54. It may have a mouth 54a and. The first liquid injection port 52a communicates with the internal space V (see FIG. 2) between the adjacent bipolar electrodes 32 and the second liquid injection port 54a. The first resin portion 52 is provided with a plurality of first liquid injection ports 52a, and the second resin portion 54 has a single second liquid injection port extending so as to cover the plurality of first liquid injection ports 52a. 54a is provided. The first liquid injection port 52a may be provided in each first resin portion 52, or may be provided between adjacent first resin portions 52. The shape of each first liquid injection port 52a is, for example, circular, and the shape of the second liquid injection port 54a is, for example, rectangular. The liquid injection port 55a is sealed by a seal (not shown) after the electrolytic solution is injected.

When the electrolytic solution is injected into the internal space V (see FIG. 2) of the power storage module 12, the protruding portion 55b sufficiently seals (airtightness) between the electrolytic solution injection device and the like and the injection port portion 55a. It has a sealing surface provided for connection in a state of (maintenance). The protruding portion 55b protrudes from the side surface 51 in the stacking direction. The protruding portion 55b is arranged so as to sandwich the liquid injection port portion 55a, and is provided with a length extending along the Y-axis direction beyond the entire length of the liquid injection port portion 55a and protruding to both outer sides of the liquid injection port portion 55a. ing.

Next, the liquid injection jig 60 used when injecting the electrolytic solution into the power storage module 12 as shown in FIG. 3 will be described in detail with reference to FIGS. 5 to 8. The liquid injection jig 60 includes a pressing portion 61, a joint portion 65, and a communication passage 71.

The pressing portion 61 is a portion that is pressed against the frame body 50 when the electrolytic solution is injected. The pressing portion 61 has a pressing surface 61a that is pressed against the frame body 50 when the electrolytic solution is injected. The pressing portion 61 is formed of an elastic resin such as rubber. The pressing portion 61 has a plurality of (seven in the present embodiment) through-passages 63 provided corresponding to the plurality of (seven in the present embodiment) first injection ports 52a. Each of the plurality of through-passages 63 has a first opening 63a. The plurality of through-passages 63 are provided so that the first opening 63a and the first liquid injection port 52a have a one-to-one correspondence when the pressing portion 61 is pressed against the frame body 50. The first opening 63a and the first liquid injection port 52a may be directly connected or may be connected via an intermediate member.

The pressing portion 61 is detachably provided with respect to the main body portion 70 that integrally forms the joint portion 65 and the communication passage 71. The main body 70 is made of resin or the like, and is formed by insert molding a member to be a joint 65. The pressing portion 61 and the main body portion 70 have a convex portion (not shown) and a concave portion 62 that are fitted to each other, and the pressing portion 61 is provided detachably from the main body portion 70.

The joint portion 65 is provided in the main body portion 70 as described above. The joint portion 65 has a plurality of (seven in this embodiment) second openings 65a provided corresponding to the plurality of first openings 63a, and is used for injecting liquid. (See FIG. 9). The size of the joint portion 65 is relatively large with respect to the distance D1 between the adjacent first liquid injection ports 52a and 52a. The joint portion 65 is arranged so that the distance D3 between the second openings 65a and 65a adjacent to each other is longer than the distance D1 between the first openings 63a and 63a adjacent to each other. The opening directions of the second openings 65a of the plurality of joint portions 65 are the same.

The communication passage 71 is a pipeline that connects the first opening 63a and the second opening 65a. The communication passage 71 is formed by a main body 70 made of resin or the like. A plurality of passages 71 (seven in the present embodiment) are provided corresponding to a plurality of (seven in the present embodiment) first injection ports 52a. The plurality of communication passages 71 are provided so that the communication passage 71 and the gangway 63 correspond one-to-one when the pressing portion 61 is fixed to the main body portion 70.

The communication passage 71 has a bent portion 73 that bends between the first opening 63a and the second opening 65a. Further, in the communication passage 71, the distance D13 between the communication passages 71b and 71b adjacent to each other on the second opening 65a side of the bending portion 73 is the communication passage adjacent to each other on the first opening 63a side of the bending portion 73. The distance between 71a and 71a is longer than D11.

Next, an example of the manufacturing method of the power storage module 12 shown in FIG. 2 will be described. As shown in FIG. 8, the method of manufacturing the power storage module 12 includes a stacking step S1, a frame body forming step S2, a preparation step S3, an installation step S4, and an electrolytic solution injection step (vacuum state forming step / injection step). ) S5 and the assembly step S6 are included. Hereinafter, each step will be described in detail.

(Laminating step S1)
First, the bipolar electrodes 32 are laminated via the separator 40 to obtain a laminated 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 laminating step.

(Frame body forming step S2)
Next, the second resin portion 54 is formed by, for example, injection molding. The second resin portion 54 is formed by installing a mold on the peripheral edge of the first resin portion 52 and pouring the resin material of the second resin portion 54 having fluidity into the mold. As a result, as shown in FIGS. 3 and 4, a frame body 50 having the first resin portion 52 and the second resin portion 54 is formed. The mold has a portion corresponding to a nest for forming the second liquid injection port 54a of the liquid injection port portion 55a.

(Preparation step S3)
Next, the liquid injection jig 60 shown in FIGS. 5 to 7 is prepared. Since the detailed configuration of the liquid injection jig 60 is as described above, the description thereof will be omitted here.

(Installation process S4)
Next, as shown in FIG. 9, in the liquid injection device 110, the supply path C1 communicating with the tank (storage portion) T in which the electrolytic solution is stored is connected to the joint portion 65, and the first liquid injection port 52a And the first opening 63a are connected. Here, the liquid injection device 110 will be described. The liquid injection device 110 includes a dispenser D, a tank T, a valve VA1, a valve VA2, a vacuum gauge G, and a vacuum pump P.

The dispenser D is a liquid quantitative discharge device, and accurately quantitatively supplies the electrolytic solution to the tank T. The tank T temporarily stores the electrolytic solution supplied by the dispenser D. The supply path C1 is a pipe for supplying the electrolytic solution from the dispenser D to the power storage module 12. Hereinafter, the dispenser D side will be described as the upstream side and the power storage module 12 side as the downstream side along the supply path C1. A valve VA1 is arranged in the supply path C1. The valve VA1 regulates the flow rate of the electrolytic solution flowing through the supply path C1. The downstream end of the supply path C1 is connected to the joint portion 65 of the liquid injection jig 60.

The liquid injection device 110 of the present embodiment has a number of tanks T corresponding to a plurality of (seven in the present embodiment) first liquid injection ports 52a, a plurality of valves VA1, and a plurality of supply paths C1. ing. A connection portion C3 to which the pipe C2 is connected is provided between the valve VA1 and the liquid injection jig 60 in the supply path C1. Hereinafter, the connection portion C3 side will be described as the upstream side and the vacuum pump P side as the downstream side along the pipe C2. A valve VA2 is provided on the downstream side of the connection portion C3 of the pipe C2. The valve VA2 regulates the flow rate of the gas flowing through the pipe C2. A vacuum gauge G is provided on the downstream side of the valve VA2 in the pipe C2. The vacuum gauge G is a pressure gauge for measuring pressure (negative pressure) below atmospheric pressure. The vacuum pump P is connected to the pipe C2 via a vacuum gauge G. The vacuum pump P is a pump for discharging gas from the internal space V in the power storage module 12 to obtain a vacuum. The other end of the pipe C2 on the downstream side may be connected to the withstand voltage tester of the power storage module 12.

The liquid injection jig 60 and the power storage module 12 are fixed via the fixing jig 120. The fixing jig 120 includes a plate-shaped member 122 that supports the side surface 51 opposite to the side surface 51 provided with the liquid injection portion 55, a plate-shaped member 124 that is arranged to face the plate-shaped member 122, and a plate-shaped member. It includes a pair of columnar members 126, 126 that connect the 122 and the plate-shaped member 124. The plate-shaped member 122 is provided so as to be in contact with the liquid injection jig 60. Each columnar member 126 is fixed to the plate-shaped member 122, and is connected to the plate-shaped member 124 by a bolt 128 penetrating the plate-shaped member 124 in the plate thickness direction. The tip of the bolt 128 is inserted into an insertion hole provided on the upper surface of the columnar member 126 and screwed. By tightening the bolt 128, the liquid injection jig 60 is pressed toward the side surface 51 side of the frame body 50, and the pressing portion 61 of the liquid injection jig 60 can be pressed against the side surface 51 of the frame body 50. In the present embodiment, an intermediate member connecting the first opening 63a and the first liquid injection port 52a is arranged between the first opening 63a and the first liquid injection port 52a. The liquid injection jig 60 is fixed to the power storage module 12 in the horizontal state, and the supply path C1 of the liquid injection device 110 is connected to the joint portion 65 facing upward in the vertical direction (see FIG. 10).

(Electrolytic solution injection step S5)
Next, the electrolytic solution is injected into the power storage module 12. Specifically, the vacuum pump P is operated with the valve VA2 opened and the valve VA1 closed. As a result, air is discharged from the internal space V in the frame body 50. Next, the dispenser D is operated to supply a specified amount of electrolytic solution to each tank T. After that, when the valve VA2 is closed and the valve VA1 is opened, the electrolytic solution stored in the tank T is injected into the internal space V in the frame body 50.

(Assembly process S6)
After passing through the above steps, the power storage module 12 shown in FIG. 2 is manufactured by sealing the liquid injection port 55a with a sealing material. After that, as shown in FIG. 1, a plurality of power storage modules 12 are laminated via the conductor 14. Positive electrode terminals 24 and negative electrode terminals 26 are connected in advance to the conductors 14 located at both ends in the stacking direction, respectively. After that, a pair of restraint plates 16 and 17 are arranged at both ends in the stacking direction via the insulating film 22. After that, the shaft portion of the bolt 18 is inserted into the insertion hole 16a of the restraint plate 16 and is inserted into the insertion hole 17a of the restraint plate 17. After that, the nut 20 is screwed into the tip of the bolt 18 protruding from the restraint plate 17. In this way, the power storage device 10 shown in FIG. 1 is manufactured.

In the liquid injection jig 60 of the above-described embodiment, as shown in FIG. 5, the distance between the second openings 65a and 65a is the distance between the first liquid injection ports 52a and 52a provided in the power storage module 12. Since it is longer than the above, it is possible to provide a joint portion 65 having a size relatively larger than the distance D1 between the first liquid injection ports 52a and 52a for each communication passage 71. Then, the first liquid injection port 52a communicating with the internal space V and the electrolytic solution can be brought into contact with each other by a simple operation of pressing the liquid injection jig 60 against the side surface 51 provided with the liquid injection port 55a of the power storage module 12. It can be connected to the liquid injection device 110 for injection. That is, the injection of the electrolytic solution for each of the first injection port 52a becomes easy.

In the liquid injection jig 60 of the above-described embodiment, since the communication passage 71 has a bent portion 73 between the first opening 63a and the second opening 65a, it is easy to connect to the liquid injection device 110. The joint portion 65 can be positioned in.

In the liquid injection jig 60 of the above-described embodiment, the distance D13 between the communication passages 71 and 71 adjacent to each other on the second opening 65a side of the bent portion 73 is such that the distance D13 between the first opening 63a side of the bent portion 73 is mutual. With a simple configuration in which the distance between the adjacent passages 71 and 71 is longer than the distance between the adjacent passages 71 and 71, the distance D3 between the second openings 65a and 65a adjacent to each other is set from the distance D1 between the first openings 63a and 63a adjacent to each other. Can also be lengthened.

In the liquid injection jig 60 of the above-described embodiment, since all the opening directions of the plurality of second openings 65a and 65a are the same, the connection of the liquid injection device 110 to the supply path C1 becomes easy.

Although one embodiment has been described in detail above, the present invention is not limited to the above embodiment.

In the liquid injection jig 60 of the above embodiment, the distance D3 between the second openings 65a and 65a adjacent to each other is set by providing the bent portion 73 between the first opening 63a and the second opening 65a. Although the distance between the adjacent first openings 63a and 63a is longer than the distance D1, the distance between the first opening 63a and the second opening 65a is formed in a straight line, and the second opening is formed. By expanding the 65a side in a fan shape, the distance D3 between the second openings 65a and 65a adjacent to each other may be longer than the distance D1 between the first openings 63a and 63a adjacent to each other.

In the above-described embodiment or modified example, an example in which the through-hole 14a is formed inside the conductor 14 has been described, but as shown in FIG. 4, a through-hole is provided in place of the conductor 14. A conductor that does not exist may be adopted.

Further, in the above-described embodiment or modified example, the power storage device 10 has been described with reference to an example of a nickel-metal hydride secondary battery, but a lithium ion secondary battery may also be used. In this case, the positive electrode active material is, for example, a composite oxide, metallic lithium, sulfur or the like. The negative electrode active material includes, for example, graphite, highly oriented graphite, mesocarbon microbeads, carbon such as hard carbon and soft carbon, alkali metals such as lithium and sodium, metal compounds, SiOx (0.5 ≦ x ≦ 1.5). Such as metal oxides, boron-added carbon, and the like.

10 ... power storage device, 12 ... power storage module, 32 ... bipolar electrode, 50 ... frame, 51 ... side surface, 52 ... first resin part, 52a ... first liquid injection port (liquid injection port), 54 ... second resin part , 54a ... second injection port, 55 ... injection part, 55a ... injection port, 55b ... protrusion, 60 ... injection jig, 61 ... pressing part, 61a ... pressing surface, 62 ... concave, 63 ... Through passage, 63a ... first opening, 65 ... joint, 65a ... second opening, 70 ... main body, 71 ... communication passage, 73 ... bent, 110 ... liquid injection device, V ... internal space.

Claims (6)

Holds a laminate in which bipolar electrodes 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 are laminated, and an edge portion of the electrode plate. , Used when injecting an electrolytic solution into a power storage module including a frame body provided with a plurality of liquid injection ports communicating with each of a plurality of internal spaces between adjacent bipolar electrodes in the laminated body. It is a liquid jig
A pressing portion having a plurality of first openings provided corresponding to the plurality of liquid injection ports and being pressed against the frame body when the electrolytic solution is injected.
A joint portion having a plurality of second openings provided corresponding to the plurality of first openings and connected to the liquid injection device connected at the time of the liquid injection, and a joint portion.
A communication passage for communicating the first opening and the second opening is provided.
A liquid injection jig in which the distance between the second openings adjacent to each other is longer than the distance between the first openings adjacent to each other. The liquid injection jig according to claim 1, wherein the communication passage has a bent portion that bends between the first opening and the second opening. The claim that the distance between the communication passages adjacent to each other on the second opening side of the bent portion is longer than the distance between the communication passages adjacent to each other on the first opening side of the bending portion. 2. The liquid injection jig described. The liquid injection jig according to claim 1, wherein the communication passage is formed in a straight line between the first opening and the second opening. The liquid injection jig according to any one of claims 1 to 4, wherein the plurality of second openings have the same opening directions. Holds a laminate in which bipolar electrodes 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 are laminated, and an edge portion of the electrode plate. A method for manufacturing a power storage module, comprising: a frame body provided with a plurality of liquid injection ports communicating with each of a plurality of internal spaces between adjacent bipolar electrodes in the laminated body.
The preparatory step for preparing the liquid injection jig according to any one of claims 1 to 5, and
An installation step of connecting a supply path communicating with a storage portion in which an electrolytic solution is stored in the liquid injection device and the joint portion, and connecting the liquid injection port and the first opening.
A vacuum state forming step of forming a vacuum state in a plurality of internal spaces which are spaces between the electrode plates adjacent to each other,
A method for manufacturing a power storage module, comprising an injection step of injecting the electrolytic solution into the internal space due to a pressure difference between the internal space in a vacuum state and the storage portion.

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