JP2018106850A - Liquid-injection device and liquid-injection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid-injection device and a liquid-injection method which can increase the production efficiency of power storage modules.SOLUTION: A liquid-injection device 100 is one arranged to inject an electrolyte solution into a power storage module 12. The liquid-injection device comprises: a second jig 140 for constraining the power storage module at a fixed distance in a lamination direction; a vacuum pump P operable to bring a plurality of internal spaces V1 to V8, which are each a space located between electrode plates 34, 34 adjacent to each other, into a vacuum condition; a pool unit T in which the electrolyte solution is stored; a plurality of supply pipes 112 which are in communication with the pool unit, and which are inserted into the plurality of internal spaces through liquid-pouring spouts; and a supplying device 110 operable to injecting the electrolyte solution into each internal space by the difference in atmospheric pressure between the internal spaces in the vacuum condition and the pool unit.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a liquid injection apparatus and a liquid injection method.

  As a conventional power storage module, a bipolar battery including a bipolar electrode in which a positive electrode is formed on one surface of an electrode plate and a negative electrode is formed on the other surface is known (see Patent Document 1). The bipolar battery is provided with a laminate formed by laminating a plurality of bipolar electrodes via a separator. The laminated body is provided with an insulating frame for sealing, and the edge of the electrode plate is held on the side surface formed by the lamination of the bipolar electrodes.

JP 2011-151016 A JP-T-2006-511919

  The above-described method for manufacturing a power storage module includes a step of injecting an electrolytic solution between bipolar electrodes in the frame. As a method for injecting an electrolytic solution, for example, as disclosed in Patent Document 2, there is a method of injecting into a vacuum cell using a needle or the like. However, since the bipolar electrode is formed by a very thin electrode plate, the volume of the space (cell) sandwiched between the bipolar electrodes is likely to change. If the cell volume changes and the cell volumes differ from cell to cell, the electrolyte supply rate from the needle or the like varies, and the production efficiency of the power storage module decreases.

  An object of this invention is to provide the liquid injection apparatus and the liquid injection method which can improve the production efficiency of an electrical storage module.

  The liquid injection device according to the present invention includes a laminate in which a bipolar electrode composed of an electrode plate having a positive electrode formed on one side and a negative electrode formed on the other side is laminated via a separator, and a laminate of bipolar electrodes Electrolysis is performed on a power storage module having a frame body that holds the edge of the electrode plate on the side surface of the laminated body that is formed, and a liquid injection port that is provided on the frame body and exposes a part of the side surface of the laminated body in the laminating direction. A liquid injection device for injecting liquid, which can form a vacuum state in a plurality of internal spaces, which are spaces between electrode plates adjacent to each other, and a restraining jig that restrains the power storage module at a constant pressure or a constant size in the stacking direction. A vacuum pump, a reservoir in which an electrolytic solution is stored, and a plurality of supply pipes that communicate with the reservoir and are inserted into each of the plurality of internal spaces through a liquid inlet, in a vacuum state Between internal space and storage And a supply device for the electrolytic solution is injected into the space by the difference.

  The liquid injection method according to the present invention includes a laminate in which a bipolar electrode composed of an electrode plate having a positive electrode formed on one side and a negative electrode formed on the other side is laminated via a separator, and lamination of the bipolar electrode A power storage module having a frame body that holds the edge of the electrode plate on the side surface of the laminate to be formed, and a liquid injection port that is provided on the frame body and exposes a part of the side surface of the laminate body in the stacking direction. A method for injecting an electrolytic solution, in which a power storage module is constrained at a constant pressure or a constant size in a stacking direction, and a vacuum state is formed in a plurality of internal spaces that are spaces between adjacent electrode plates Insert a supply pipe that communicates with the process and the reservoir in which the electrolyte is stored into each of the plurality of internal spaces through the liquid inlet, and electrolyze the internal space by the pressure difference between the vacuum internal space and the reservoir Inject liquid Having an injection step.

  In the liquid injection device and the liquid injection method, the power storage module is restrained at a constant pressure or a constant size in the stacking direction, so that the displacement of the electrode plate at the time of electrolyte injection can be suppressed. Thereby, the volume of several internal space which is the space of mutually adjacent electrode plates can be maintained constant. As a result, the injection rate when the electrolyte is injected into the internal space due to the pressure difference between the vacuum internal space formed by the vacuum pump and the storage portion becomes substantially constant in all the supply pipes. As a result, the time for injecting the specified amount of electrolyte into the internal space is substantially the same for all the supply pipes, and the production efficiency of the power storage module can be increased.

  In the liquid injection device and the liquid injection method according to the present invention, the separator may be compressed in the stacking direction.

  In a power storage module in which the separator is compressed, the displacement of the electrode plate increases due to the stress of the separator, and the volume changes when not restrained by a restraining jig as in the liquid pouring device and the liquid pouring method according to the present invention. easy. When manufacturing such a power storage module, the production efficiency can be further increased.

  In the liquid injection device according to the present invention, a plurality of supply pipes are provided, and each of the storage units may store a preset amount of the electrolytic solution.

  In the injection step of the liquid injection method according to the present invention, a predetermined amount of electrolyte may be injected into each of the plurality of internal spaces.

  With this liquid injection device and liquid injection method, it is possible to reliably inject a specified amount of electrolyte into each of the plurality of internal spaces.

  In the liquid injection device according to the present invention, the reservoir may be provided in common for the plurality of supply pipes.

  In the injection step of the liquid injection method according to the present invention, the electrolytic solution may be supplied from a common supply source to the plurality of internal spaces.

  In this liquid injection device and liquid injection method, the volume of all the internal spaces can be kept constant, so that the injection rate from the supply pipe is constant, and the injection amount of the electrolyte is easy to adjust. Therefore, it is not necessary to provide a portion for storing a predetermined amount of electrolyte for each of the plurality of supply pipes. Thereby, an injection apparatus can be made cheaply and an apparatus structure can be simplified. Moreover, also when manufacturing an electrical storage module, the effort which stores the electrolyte solution of the quantity preset for every some supply pipe | tube can be saved, and workability | operativity improves.

  In the liquid injection device according to the present invention, the power storage module is provided with a plurality of liquid injection ports, and the plurality of supply pipes in the supply device are connected to each of the plurality of internal spaces via the plurality of liquid injection ports. It may be inserted one by one.

  In the liquid injection method according to the present invention, the power storage module is provided with a plurality of liquid injection ports. May be inserted one by one.

  In the laminated body of bipolar electrodes, the distance between the electrode plates adjacent to each other is very narrow, and the interval between the supply pipes must be narrowed. In the liquid injection device and the liquid injection method according to the present invention, for example, when an electrolyte is injected into a battery module provided with four liquid injection ports, one supply pipe is inserted into each of four internal spaces. As a result, the distance between adjacent supply pipes can be increased. Thereby, when inserting a supply pipe | tube into internal space, it becomes easy to arrange | position each supply pipe | tube.

  ADVANTAGE OF THE INVENTION According to this invention, the production efficiency of an electrical storage module can be improved.

It is a schematic sectional drawing which shows an electrical storage apparatus provided with the electrical storage module by which electrolyte solution is inject | poured with the liquid injection apparatus which concerns on one Embodiment. 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 of the electrical storage module of FIG. It is a schematic sectional drawing of the liquid injection apparatus which concerns on one Embodiment. It is a schematic sectional drawing of the liquid injection apparatus which concerns on one Embodiment. It is a schematic sectional drawing of the liquid injection apparatus which concerns on one Embodiment. It is the flowchart which showed an example of the manufacturing method of the electrical storage module containing the liquid injection method which concerns on one Embodiment. 6 is a schematic cross-sectional view of a liquid injection device according to Modification Example 1. FIG. 10 is a schematic cross-sectional view of a liquid injection device according to Modification 2. FIG. (A) And (B) is a schematic sectional drawing of the liquid injection apparatus which concerns on the modification 2. FIG. (A)-(D) are the figures which showed the relationship between the supply pipe | tube of the liquid injection apparatus which concerns on the modification 2, and internal space.

  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. 1 to 13 show an XYZ orthogonal coordinate system except for FIG.

[Configuration of power storage device]
First, the structure of the electrical storage module in which electrolyte solution is inject | poured with the liquid injection apparatus which concerns on one Embodiment is demonstrated. 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 secondary batteries such as nickel hydride secondary batteries and lithium ion secondary batteries, but may be electric double layer capacitors. In the following description, a nickel metal hydride secondary battery is illustrated.

  The plurality of power storage modules 12 are stacked via a conductor 14 such as a metal plate to form an array 11. The conductor 14 is one metal body disposed between the power storage modules 12 and 12 adjacent to each other, and is disposed in contact with both the power storage modules 12 and 12 adjacent to each other. The conductor 14 is made of, for example, a metal material such as aluminum. 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 disposed in a region where the power storage module 12 is disposed when viewed from the stacking direction. The conductor 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.

  The conductors 14 are also arranged outside the power storage modules 12 positioned 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 body 11 in the stacking direction. In the stacking direction, a positive electrode terminal 24 is connected to the conductor 14 located at one end, and a negative electrode terminal 26 is connected to the conductor 14 located at the other end. The positive terminal 24 may be integral 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 and negative terminals 24 and 26 can charge and discharge the power storage device 10.

  The conductor 14 also functions as a heat radiating plate for releasing heat generated in the power storage module 12. Specifically, the conductor 14 has higher thermal conductivity than the contact surface 12 a with the conductor 14 in the power storage module 12. In addition, a through hole 14 a extending in a direction (Y direction) intersecting the stacking direction is provided inside the conductor 14. The through hole 14 a communicates from one side surface facing each other in the conductor 14 to the other side surface. The through holes 14a are arranged in a stacking direction and a direction (X direction) intersecting the stacking direction. When a gaseous refrigerant such as air passes through such a through hole 14a, 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 the through holes 14a, and the like are adjusted as appropriate 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 that actively circulates (circulates) air through the through hole 14a.

  The power storage device 10 may include a restraining member 15 that restrains the alternately stacked power storage modules 12 and conductors 14 in the stacking direction. The restraining member 15 includes a pair of restraining plates 16 and 17 and a connecting member (bolt 18 and nut 20) for joining the restraining plates 16 and 17 together. For example, an insulating film 22 such as a resin film is disposed between the restraining plates 16 and 17 and the conductor 14. Each restraint plate 16 and 17 is comprised, for example with metals, such as iron.

  When viewed from the stacking direction, each of the restraining plates 16 and 17 and the insulating film 22 has, for example, a rectangular shape. The insulating film 22 is larger than the conductor 14, and the restraining plates 16 and 17 are larger than the power storage module 12. When viewed from the stacking direction, an insertion hole 16 a 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 of the restraint plate 16. Similarly, when viewed from the stacking direction, an insertion hole 17 a through which the shaft portion of the bolt 18 is inserted is provided at the edge of the restraint plate 17 at a position outside the power storage module 12. When each restraint plate 16, 17 has a rectangular shape when viewed from the stacking direction, the insertion hole 16 a and the insertion hole 17 a are located at the corners of the restraint plates 16, 17.

  One constraining plate 16 is abutted against the conductor 14 connected to the negative electrode terminal 26 via the insulating film 22, and the other constraining plate 17 applies the insulating film 22 to the conductor 14 connected to the positive electrode terminal 24. Has been hit through. For example, the bolt 18 is passed through the insertion hole 16a from one restraint plate 16 side to the other restraint plate 17 side, and a nut 20 is screwed onto 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 stacked body 30 in which a plurality of bipolar electrodes 32 are stacked. When viewed from the stacking direction of the bipolar electrode 32, the stacked body 30 has, for example, a rectangular shape. A separator 40 may be disposed between the 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 stacked body 30, the positive electrode layer 36 of one bipolar electrode 32 faces the negative electrode layer 38 of one bipolar electrode 32 adjacent in the stacking direction across the separator 40, 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 adjacent in the stacking direction with the separator 40 interposed therebetween.

  In the stacking direction, an electrode plate 34 (negative electrode side termination electrode) having a negative electrode layer 38 disposed on the inner surface is disposed at one end of the stacked body 30, and a positive electrode layer 36 is disposed on the inner surface at the other end. An electrode plate 34 (positive terminal electrode) is disposed. The negative electrode layer 38 of the negative electrode side termination electrode is opposed to the positive electrode layer 36 of the uppermost bipolar electrode 32 with the separator 40 interposed therebetween. The positive electrode layer 36 of the positive electrode termination electrode faces the negative electrode layer 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 conductors 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 stacking 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 layer 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 34a. Yes. 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 layer 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. Examples of the positive electrode active material constituting the positive electrode layer 36 include 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 such as conductive rubber, for example.

  The separator 40 is formed in a sheet shape, for example. Examples of the material forming the separator 40 include porous films made of polyolefin resins such as polyethylene (PE) and polypropylene (PP), woven fabrics and nonwoven fabrics made of polypropylene, polyethylene terephthalate (PET), methylcellulose and the like. It is. Moreover, 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 formed in a bag shape. The separator 40 is compressed in the stacking direction.

  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).

  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.

  On the side surface 50 s of the frame body 50, a liquid injection port 50 a for injecting an electrolyte 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.

  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 portion 52 is provided with a plurality of first openings 52a, and the second resin portion 54 is provided with a single second opening 54a that extends so as to cover the plurality of first openings 52a. Yes. In this case, the electrolytic solution is injected into the frame body 50 from the second opening 54a via the first opening 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.

[Method for Manufacturing Power Storage Device]
Next, an example of a method for manufacturing the power storage module 12 shown in FIG. 2 will be described. As shown in FIG. 9, the method of manufacturing the power storage module 12 includes a stacking step S1, a frame forming step S2, a restraining step S3, an electrolyte injection step (vacuum state forming step / injection step) S4, and an assembly. Step S5 is included. Hereinafter, each step will be described in detail.

(Lamination process S1)
First, as shown in FIG. 5, 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 step S2)
Next, the second resin portion 54 is formed by, for example, injection molding (see FIG. 2). The 2nd resin part 54 is formed by installing mold M in the peripheral part of the 1st resin part 52, and pouring the resin material of the 2nd resin part 54 which has fluidity in the mold concerned. 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 has a portion corresponding to a nesting for forming the second opening 54a of the liquid injection port 50a.

(Restraining step S3)
Next, the stacked body 30 having the frame 50 formed in the frame forming process is constrained in the stacking direction. Hereinafter, for convenience of explanation, the laminated body 30 having the frame body 50 is simply referred to as the power storage module 12. First, the 2nd jig | tool 140 which restrains the electrical storage module 12 in the lamination direction is demonstrated. As shown in FIGS. 6 and 7, the second jig 140 is a jig that restrains the power storage module 12 with a fixed dimension (fixed dimension) in the stacking direction. The second jig 140 includes a pair of restraining plates 141 and 141, a bolt 143, and a nut 145. The pair of restraining plates 141 and 141 are members on a flat plate that restrains the power storage module 12 from the stacking direction. The bolt 143 and the nut 145 are members that fasten the pair of restraining plates 141 and 141.

  Specifically, a pair of restraining plates 141 and 141 are disposed at both ends in the stacking direction of the power storage modules 12. Next, the bolts 143 are inserted into the insertion holes 141 a and 141 a formed in the pair of restriction plates 141 and 141 from the one restriction plate 141 side to the other restriction plate 141. Next, the nut 145 is screwed onto the tip of the bolt 143 protruding to the other restraining plate 141 side. As a result, the pair of restraining plates 141 and 141 are fastened by the bolt 143 and the nut 145. At this time, since the distance between the pair of restraining plates 141 and 141 is maintained by keeping the tightening amount of the nut 145 constant, the power storage module 12 can be restrained with a fixed size in the stacking direction.

(Electrolyte injection step S4)
Next, as shown in FIGS. 6 and 7, an electrolytic solution is injected into the frame body 50 from a liquid injection port 50 a provided in the frame body 50. The electrolytic solution is injected in a state where the packing 116 of the attachment 114 is pressed against a region around the liquid injection port 50 a on the side surface 50 s of the frame body 50. Next, the configuration of the liquid injection device 100 of one embodiment will be described in detail. The liquid injection device 100 includes a supply device 110, a first jig 120, and a second jig 140. In FIG. 7, the internal structure of the power storage module 12, that is, the configuration of the stacked body 30 as illustrated in FIG. 2 and the detailed configuration of the supply pipe 112 described in detail later are omitted. .

  The supply device 110 includes a dispenser D, a tank (reservoir) T, a valve VA1, a valve VA2, a vacuum gauge G, a vacuum pump P, a supply pipe 112, an attachment 114, an attachment 114, and a packing 116. And having.

  The dispenser D is a liquid fixed quantity discharge device, and supplies a fixed quantity of electrolyte to the tank T with high accuracy. The tank T temporarily stores the electrolyte supplied by the dispenser D. The supply path C <b> 1 is a pipe for supplying the electrolytic solution from the dispenser D to the power storage module 12. Hereinafter, along the supply path C1, the dispenser D side will be described as the upstream side, and the power storage module 12 side will be described as the downstream side. A valve VA1 is disposed in the supply path C1. The valve VA1 adjusts the flow rate of the electrolyte flowing through the supply path C1. A supply pipe 112 is provided at the downstream end of the supply path C1.

  The supply pipe 112 communicates with the supply path C1 and circulates the electrolytic solution supplied from the supply path C1. The supply pipe 112 is a cylindrical member that penetrates the plate member 124 provided in the first jig 120 described in detail later 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 112 is located at the liquid injection port 50a. The packing 116 is disposed between the attachment 114 and the side surface 50 s of the frame body 50. The packing 116 seals between the supply pipe 112 and the liquid injection port 50a.

  As shown in FIG. 8, the supply device 110 according to the present embodiment includes a plurality of tanks T1 to T8, a plurality of valves VA1 to VA8, and a plurality of supply pipes 112A to 112H. The plurality of tanks T1 to T8, the plurality of valves VA11 to VA18, and the plurality of supply pipes 112A to 112H are connected to one dispenser D via supply paths C11 to C18, respectively. The plurality of supply pipes 112A to 112H are inserted into the plurality of internal spaces V1 to V8 via the liquid injection port 50a and the first opening 52a, respectively. In FIG. 8, illustration of a part of the configurations shown in FIGS. 6 and 7 is omitted.

  Returning to FIG. 6 and FIG. 7, a connecting portion C3 to which the pipe C2 is connected is provided between the valve VA1 and the supply pipe 112 in the supply path C1. Hereinafter, the connection part C3 side will be described along the pipe C2 as the upstream side, and the vacuum pump P side as the downstream side. A valve VA2 is provided on the downstream side of the connection portion C3 of the pipe C2. The valve VA2 adjusts 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 a pressure (negative pressure) below atmospheric pressure. The vacuum pump P is connected to the pipe C2 via the vacuum gauge G. The vacuum pump P is a pump for exhausting gas from the internal space V in the power storage module 12 to obtain a vacuum. Note that the other end on the downstream side of the pipe C <b> 2 may be connectable to a pressure tester of the power storage module 12.

  The first jig 120 is a jig that holds the attachment 114 (packing 116) in the supply device 110 in close contact with the frame body 50. The first jig 120 includes a plate-like member 122 that supports the side surface of the frame 50 opposite to the side surface 50 s in the power storage module 12, a plate-like member 124 that is disposed opposite to the plate-like member 122, and a plate-like member 122 and a pair of columnar members 126 and 126 that connect the plate-like member 124. The plate-like member 124 has a through hole of the supply pipe 112 and is provided so as to be in contact with the attachment 114. Each columnar member 126 is fixed to the plate-like member 122 and connected to the plate-like member 124 by a bolt 128 that penetrates the plate-like 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 packing 116 pressed by the plate member 124 can be pressed against the side surface 50 s of the frame body 50.

  The injection of the electrolytic solution is performed, for example, as follows using the liquid injection device 100 shown in FIGS. First, the vacuum pump P is operated with the valve VA2 opened and the valve VA1 closed. Thereby, 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 of the tanks T1 to T8. Thereafter, when the valve VA2 is closed and the valve VA1 is opened, the electrolytic solution stored in the tanks T1 to T8 is injected into the internal space V in the frame 50.

(Assembly process S5)
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 conductor 14. A positive electrode terminal 24 and a negative electrode terminal 26 are previously connected to the conductors 14 located at both ends in the stacking direction, respectively. Thereafter, a pair of restraining plates 16 and 17 are respectively disposed at both ends in the stacking direction via the insulating film 22. Thereafter, the shaft portion of the bolt 18 is inserted into the insertion hole 16 a of the restraining plate 16 and inserted into the insertion hole 17 a of the restraining plate 17. Thereafter, the nut 20 is screwed onto 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 device 100 and the method for manufacturing the power storage module 12 of the above-described embodiment, the power storage module 12 is restrained with a fixed size in the stacking direction, so that the displacement of the electrode plate 34 at the time of electrolyte injection can be suppressed. Thereby, the volume of several internal space V1-V8 which is the space of the mutually adjacent electrode plates 34 and 34 shown by FIG. 8 can be maintained constant. Thereby, the injection speed when injecting the electrolyte into the internal spaces V1 to V8 due to the respective atmospheric pressure differences between the vacuum internal spaces V1 to V8 and the tanks T1 to T8 formed by the vacuum pump P is all supplied. It becomes substantially constant in the tubes 112A to 112H. For this reason, the time for injecting the prescribed amount of electrolyte into the internal spaces V1 to V8 is substantially the same for all the supply pipes 112A to 112H, and the production efficiency of the power storage module 12 can be increased.

  The method for manufacturing the liquid injection device 100 and the power storage module 12 according to the embodiment described above is particularly effective when the electrolyte is injected into the power storage module 12 in which the separator 40 is compressed in the stacking direction. That is, in such a power storage module 12, the displacement of the electrode plate 34 increases due to the stress of the separator 40, so that the second jig 140 is restrained as in the manufacturing method of the liquid injection device 100 and the power storage module 12 as described above. If not, volume changes are likely to occur. Therefore, if the change in volume can be suppressed, the production efficiency of the power storage module 12 can be further increased. As described above, in the manufacturing method of the liquid injection device 100 and the power storage module 12, the power storage module 12 is restrained in the stacking direction, so that the displacement of the electrode plate 34 can be suppressed, and the internal spaces V1 to V8 of the power storage module 12 can be suppressed. Can be kept constant. For this reason, the production efficiency of the electrical storage module 12 can be further improved.

  In the method for manufacturing the liquid injection device 100 and the power storage module 12 according to the embodiment described above, a plurality of tanks T1 to T8 are provided for each of the plurality of supply pipes 112A to 112H, and each of the tanks T1 to T8 is set in advance. The amount of electrolyte is stored. In the method for manufacturing the liquid injection device 100 and the power storage module 12, a specified amount of electrolyte can be reliably injected into each of the plurality of internal spaces V1 to V8.

  As mentioned above, although one embodiment was described in detail, the present invention is not limited to the above-mentioned embodiment.

<Modification 1>
In the above embodiment, as shown in FIG. 8, a plurality of tanks T1 to T8 are provided for each of the plurality of supply pipes 112A to 112H, and each of the tanks T1 to T8 has a predetermined amount of electrolyte. However, the present invention is not limited to this. For example, the tank T may be provided in common to the plurality of supply pipes 112A to 112H as in the configuration of the liquid injection apparatus 100A illustrated in FIG. When the electrolytic solution is injected in a state where the power storage module 12 is constrained with a fixed size in the stacking direction, the volume of all the internal spaces V1 to V8 can be maintained constant, so that the injection rate from the supply pipes 112A to 112H becomes constant, It becomes easy to adjust the injection amount of the electrolytic solution. Therefore, for example, by adjusting the injection time, it is possible to inject a specified amount of electrolyte without providing a tank for storing a preset amount of electrolyte for each of the plurality of supply pipes 112A to 112H. become. Thereby, an injection apparatus can be made cheaply and an apparatus structure can be simplified. Moreover, also when manufacturing the electrical storage module 12, the effort which stores the electrolyte solution of the quantity preset for every some supply pipe | tube 112A-112H can be saved, and workability | operativity improves.

<Modification 2>
In the said embodiment, as FIG. 3 shows, the liquid injection apparatus which inject | pours electrolyte solution into the laminated body 30 (electric storage module 12) in which the one liquid injection port 50a is formed through the said liquid injection port 50a. The method for manufacturing 100 or the power storage module 12 has been described as an example, but the present invention is not limited to this. For example, a liquid injection device 100B configured as described below can be used for a power storage module provided with a plurality of liquid injection ports 50a. Hereinafter, an example in which an electrolytic solution is injected into the power storage module 330 in which the four injection ports 50a are formed will be described with reference to FIGS.

  As shown in FIG. 11, the liquid injection device 100 </ b> B is configured to be able to insert supply pipes 112 for injecting an electrolytic solution from four liquid injection ports 50 a. That is, the liquid injection device 100B is provided with four attachments 114 provided at positions corresponding to the four liquid injection ports 50a. The electrolytic solution is injected in a state where each of the packings 116 in the attachment 114 is pressed against a region around each liquid injection port 50 a on the side surface 50 s of the frame body 50. In this case, the supply pipes 112A to 112H are not inserted into all the internal spaces V1 to V8 (see FIGS. 12A and 12B) at the respective liquid injection ports 50a.

  For example, as shown in FIG. 13A, two supply pipes 112A and 112E for insertion into the two internal spaces V1 and V5 are inserted into the first liquid injection port 50a. As shown in FIG. 13B, two supply pipes 112B and 112F for insertion into the two internal spaces V2 and V6 are inserted into the eye injection port 50a, and the third liquid injection is performed. Although not shown, two supply pipes 112C and 112G (see FIG. 13C) for insertion into the two internal spaces V3 and V7 are inserted into the port 50a, and the fourth liquid injection port. The supply pipes 112D and 112H (see FIG. 13D) for insertion into the two internal spaces V4 and V8 are inserted into the 50a, although this is not shown. Thus, when inserting the supply pipe | tube 112 one by one in each internal space V1-V8, it is the characteristics of this modification in the point distributed and inserted in the some injection port 50a, respectively.

  In the power storage module 330 having bipolar electrodes, the distance between the electrode plates 34 and 34 adjacent to each other is very narrow, and the interval between the supply pipes 112 and 112 must be narrowed. In the liquid injection device 100B and the liquid injection method according to this modification, for example, when an electrolytic solution is injected into the power storage module 330 provided with the four liquid injection ports 50a, FIG. 13 (A) to FIG. 13 (D). As shown in FIG. 4, the supply pipe 112 has only to be inserted for every four internal spaces, and a distance corresponding to three internal spaces can be secured. Thereby, the distance D1 between the adjacent supply pipes 112 and 112 can be separated. As a result, when the supply pipes 112A to 112H are inserted into the internal spaces V1 to V8, the supply pipes 112A to 112H are easily arranged.

  Further, in the above-described embodiment or modification, when the electrolyte is injected into the power storage module, the power storage module is restrained with a constant size in the stacking direction. However, the power storage module is restrained with a constant pressure in the stacking direction. May be.

  Moreover, although the electrical storage apparatus 10 gave and demonstrated the example of the nickel hydride secondary battery in the said embodiment or modification, a lithium ion secondary battery may be sufficient. In this case, the positive electrode active material is, for example, a composite oxide, metallic lithium, sulfur or the like. Examples of the negative electrode active material include carbon such as graphite, highly oriented graphite, mesocarbon microbeads, hard carbon, and soft carbon, alkali metals such as lithium and sodium, metal compounds, and SiOx (0.5 ≦ x ≦ 1.5). And metal oxides such as boron and carbon added with boron. For the electrode plate, stainless steel foil or the like can be used.

  DESCRIPTION OF SYMBOLS 10 ... Power storage device, 12 ... Power storage module, 30 ... Laminated body, 32 ... Bipolar electrode, 34 ... Electrode plate, 36 ... Positive electrode layer, 38 ... Negative electrode layer, 40 ... Separator, 50 ... Frame, 50a ... Liquid injection port, DESCRIPTION OF SYMBOLS 100,100A, 100B ... Injection apparatus, 110 ... Supply apparatus, 112 (112A-112H) ... Supply pipe, 120 ... First jig, 140 ... Second jig, 141 ... Restraint plate, 143 ... Bolt, 145 ... Nut, 330 ... power storage module, C1 (C11-C18) ... supply path, C2 ... piping, C3 ... connection, P ... vacuum pump, T (T1-T8) ... tank (reservoir), V (V1-V8) ... internal space.

Claims (10)

A laminated body in which a bipolar electrode composed of an electrode plate having a positive electrode formed on one side and a negative electrode formed on the other side is laminated via a separator, and a side surface of the laminated body formed by stacking the bipolar electrodes Injecting the electrolyte into a power storage module having a frame body that holds the edge of the electrode plate and a liquid injection port that is provided on the frame body and exposes a part of the side surface of the multilayer body in the stacking direction An infusion device for
A restraining jig for restraining the power storage module at a constant pressure or a constant size in the stacking direction;
A vacuum pump capable of forming a vacuum state in a plurality of internal spaces which are spaces between the electrode plates adjacent to each other;
A storage section in which the electrolytic solution is stored; and a plurality of supply pipes that are in communication with the storage section and inserted into the plurality of internal spaces through the liquid injection port, respectively, and are in a vacuum state And a supply device for injecting the electrolytic solution into the internal space due to a pressure difference between the internal space and the storage portion.   The liquid injection device according to claim 1, wherein the separator in the power storage module is compressed in the stacking direction.   The injection unit according to claim 1 or 2, wherein a plurality of the storage units are provided for each of the plurality of supply pipes, and each of the storage units stores a predetermined amount of the electrolytic solution.   The liquid injection device according to claim 1 or 2, wherein the storage section is provided in common to the plurality of supply pipes. The power storage module is provided with a plurality of the liquid injection ports,
5. The liquid injection according to claim 1, wherein the plurality of supply pipes in the supply device are inserted one by one into each of the plurality of internal spaces via the plurality of liquid injection ports. apparatus. A laminated body in which a bipolar electrode composed of an electrode plate having a positive electrode formed on one side and a negative electrode formed on the other side is laminated via a separator, and a side surface of the laminated body formed by stacking the bipolar electrodes The electrolyte solution to the power storage module includes: a frame body that holds an edge of the electrode plate; and a liquid injection port that is provided in the frame body and exposes a part of the side surface of the stacked body in the stacking direction. A liquid injection method,
A restraining step of restraining the power storage module with a constant pressure or a constant size in the stacking direction;
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 supply pipe that communicates with the storage part in which the electrolytic solution is stored is inserted into each of the plurality of internal spaces via the liquid injection port, and the internal space is caused by a pressure difference between the internal space in a vacuum state and the storage part. And an injection step of injecting the electrolytic solution into the liquid injection method.   The liquid injection method according to claim 6, wherein the separator in the power storage module is compressed in the stacking direction.   The liquid injection method according to claim 6 or 7, wherein in the injection step, a predetermined amount of the electrolytic solution is injected into each of the plurality of internal spaces.   The injection method according to claim 6 or 7, wherein, in the injection step, the electrolytic solution is supplied from a common supply source to the plurality of internal spaces. The power storage module is provided with a plurality of the liquid injection ports,
The injection according to any one of claims 6 to 9, wherein in the injection step, a plurality of the supply pipes are inserted into the plurality of internal spaces one by one through the plurality of liquid injection ports. Liquid method.

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