JP2018170265A - Inspection method of power storage module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection method of power storage module capable of inspecting airtightness a power storage module easily.SOLUTION: In an inspection process S20, airtightness a power storage module 12 is inspected, based on the change in the thickness of the power storage module 12 due to inflow of a fluid for a first liquid injection port 50Aa and a second liquid injection port 50Ba. When there is no problem in airtightness, only the thickness at a portion of the power storage module 12 corresponding to the first liquid injection port 50Aa changes by a specified quantity, due to inflow of a fluid for the first liquid injection port 50Aa, and only the thickness at a portion of the power storage module 12 corresponding to the second liquid injection port 50Ba changes by a specified quantity, due to inflow of a fluid for the second liquid injection port 50Ba. In other words, there is a problem in the airtightness of the power storage module 12, when this relationship is not established.SELECTED DRAWING: Figure 5

Description

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

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

JP 2012-234823 A

  Here, in the electricity storage module, an internal space is formed between the plurality of bipolar electrodes, and the airtightness of each internal space needs to be ensured. Therefore, there has been a demand for an inspection method for a power storage module that can easily check the airtightness of such a power storage module.

  An object of one aspect of the present invention is to provide an inspection method for a power storage module that can easily check the airtightness of the power storage module.

  In a storage module inspection method according to one aspect of the present invention, a plurality of 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 stacked. A method for inspecting a power storage module, comprising: a stacked body; and a frame body that holds an edge of an electrode plate on a side surface of the stacked body extending in the stacking direction of the bipolar electrode, and a preparation step for preparing the power storage module; And an inspection process for inspecting the airtightness of the energy storage module. In the energy storage module prepared in the preparation process, the first injection port for injecting the electrolytic solution into the frame body and the second in the frame body The liquid injection port is provided at least, and the frame includes a plurality of first resin portions that hold the edge of the electrode plate, and a second resin portion that is provided around the first resin portion when viewed from the stacking direction. The first injection port is formed of a plurality of first resin portions. And a second opening provided in the second resin portion, and the first opening communicates with the internal space of the power storage module and the second opening. The second injection port is different from the second opening of the second resin portion and the third opening provided in the first resin portion different from the first opening among the plurality of first resin portions. A fourth opening provided at a location, and the third opening communicates with the internal space of the power storage module and the fourth opening, and communicates with the first injection port in the internal space of the power storage module. And the portion communicated with the second liquid inlet are sealed, and in the inspection process, the thickness of the power storage module due to the inflow of fluid to the first liquid inlet and the second liquid inlet Based on the change, the airtightness of the power storage module is inspected.

  In this power storage module inspection method, in the power storage module prepared in the power storage module preparation step, a first liquid injection port and a second liquid injection port for injecting an electrolyte into the frame body are provided in the frame body. At least provided. Moreover, the 1st injection hole has the 1st opening provided in either of several 1st resin parts, and the 2nd opening provided in the 2nd resin part. The first opening communicates with the internal space of the power storage module and the second opening. With such a configuration, a part of the internal space of the power storage module is in communication with the first liquid inlet. On the other hand, the second liquid injection port is different from the second opening in the second resin portion and the third opening provided in the first resin portion different from the first opening among the plurality of first resin portions. 4th opening provided in the location. The third opening communicates with the internal space of the power storage module and the fourth opening. With such a configuration, the other part of the internal space of the power storage module that is not in communication with the first liquid inlet is in a state of being in communication with the second liquid inlet. Of the internal space of the power storage module provided with such a first liquid inlet and a second liquid inlet, a portion communicated with the first liquid inlet and a portion communicated with the second liquid inlet The space is sealed. Therefore, when the fluid flows in and out from the first liquid inlet, only the thickness of the portion corresponding to the first liquid inlet of the power storage module changes by a predetermined amount if there is no problem with airtightness. Similarly, when the fluid flows in and out from the second liquid inlet, only the thickness of the portion corresponding to the second liquid inlet of the power storage module changes by a predetermined amount if there is no problem with airtightness. . An inspection step of preparing the power storage module in such a state and inspecting the airtightness of the prepared power storage module is executed. In the inspection step, the airtightness of the power storage module is inspected based on the change in the thickness of the power storage module due to the inflow of fluid to the first liquid inlet and the second liquid inlet. As described above, when there is no problem in airtightness, only the thickness of the portion corresponding to the first liquid injection port in the power storage module changes by a predetermined amount due to the inflow of fluid to the first liquid injection port. By the inflow of the fluid to the liquid injection port, a relationship is established in which only the thickness of the portion corresponding to the second liquid injection port in the power storage module changes by a predetermined amount. That is, when the relationship does not hold, it can be understood that there is a problem with the airtightness of the power storage module. As described above, the airtightness can be easily inspected based on the change in the thickness of the power storage module without using a complicated apparatus or inspection method. As described above, the airtightness of the power storage module can be easily inspected.

  In the inspection process, the fluid flows into the first liquid inlet and the second liquid inlet to increase the thickness of the power storage module, and the fluid flows out from either the first liquid inlet or the second liquid inlet. Then, after reducing the thickness of the power storage module, the airtightness of the power storage module may be inspected based on the thickness of the power storage module. When there is no problem in the airtightness of the power storage module, after flowing the fluid into the first injection port and the second injection port, the fluid flows from either the first injection port or the second injection port. As a result, only the decrease in the thickness of the portion corresponding to the liquid injection port that has flowed out becomes a relationship in which the thickness of the power storage module decreases. That is, when the relationship does not hold, it can be understood that there is a problem with the airtightness of the power storage module.

  In the inspection process, the fluid is introduced into the first liquid inlet and the second liquid inlet to increase the thickness of the power storage module, and the thickness of the power storage module is measured, thereby checking the airtightness of the power storage module. You can do it. For example, when fluid leaks from the power storage module to the outside, the power storage module does not increase to a predetermined amount when the fluid flows into the first liquid inlet and the second liquid inlet. Therefore, by measuring the thickness of the power storage module, it can be understood that there is a problem in the airtightness of the power storage module.

  In a storage module inspection method according to one aspect of the present invention, a plurality of 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 stacked. A method for inspecting a power storage module, comprising: a stacked body; and a frame body that holds an edge of an electrode plate on a side surface of the stacked body extending in the stacking direction of the bipolar electrode, and a preparation step for preparing the power storage module; In the storage module prepared in the preparation process, a plurality of internal spaces sealed together are formed in the stacking direction of the bipolar electrodes, and in the inspection process, Of the plurality of internal spaces, the first pressure measuring unit is attached to the first internal space, and among the plurality of internal spaces, the second internal space is adjacent to the first internal space in the stacking direction. On the other hand, based on the pressure in the first internal space measured by the first pressure measurement unit when the first fluid supply unit is attached and the fluid is supplied from the first fluid supply unit to the second internal space. The airtightness of the power storage module is inspected.

  In this power storage module inspection method, the first pressure measurement unit is attached to the first internal space. The first fluid supply unit is attached to the second internal space that is adjacent to the first internal space in the stacking direction. Here, when the airtightness between the first internal space and the second internal space is ensured, the pressure in the first internal space does not change even if fluid is supplied to the second internal space. . On the other hand, when the airtightness between the first internal space and the second internal space is not ensured, the pressure in the first internal space also changes by supplying the fluid to the second internal space. . Therefore, the inspection is performed based on the pressure in the first internal space measured by the first pressure measurement unit when the fluid is supplied from the first fluid supply unit to the second internal space. The airtightness between the internal space and the second internal space can be easily inspected. As described above, the airtightness of the power storage module can be easily inspected.

  The second pressure measurement unit is attached to the third internal space adjacent to the second internal space in the stacking direction among the multiple internal spaces, and the third internal space among the multiple internal spaces. And a second fluid supply unit that supplies fluid to a fourth inner space adjacent to one another in the stacking direction is attached to supply fluid from the first fluid supply unit to the second inner space, and The pressure of the first internal space measured by the first pressure measurement unit when the fluid is supplied from the two fluid supply units to the fourth internal space, and the third pressure measured by the second pressure measurement unit You may test | inspect the airtightness of an electrical storage module based on the pressure of internal space. As described above, when the pressure measuring unit and the fluid supply unit are alternately provided for the plurality of internal spaces, the third internal space includes the second internal space and the fourth internal space to which the fluid is supplied. Thus, it is sandwiched from both sides in the stacking direction. Accordingly, the fluid is supplied simultaneously from the first fluid supply unit and the second fluid supply unit, and the pressure in the third internal space is measured by the second pressure measurement unit, so that the second internal space and the third fluid supply unit are measured. The airtightness between the internal space and the airtightness between the third internal space and the fourth internal space can be inspected at the same time.

  The pressure at which the first fluid supply unit supplies the fluid to the second internal space and the pressure at which the second fluid supply unit supplies the fluid to the fourth internal space may be different from each other. In this case, the airtightness between the second internal space and the third internal space is not ensured, and the airtightness between the third internal space and the fourth internal space is not ensured. The case where the airtightness on both sides is not ensured differs from the case where the pressure change in the third internal space is different. Therefore, it is possible to easily grasp which part of the airtightness is not ensured from the measurement result of the second pressure measurement unit.

  In a storage module inspection method according to one aspect of the present invention, a plurality of 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 stacked. A method for inspecting a power storage module, comprising: a stacked body; and a frame body that holds an edge of an electrode plate on a side surface of the stacked body extending in the stacking direction of the bipolar electrode, and a preparation step for preparing the power storage module; In the storage module prepared in the preparation process, a plurality of internal spaces sealed together are formed in the stacking direction of the bipolar electrodes, and in the inspection process, Among the plurality of internal spaces, a detection unit that detects the detection gas is attached to the first internal space, and among the plurality of internal spaces, the second adjacent to the first internal space in the stacking direction. A detection gas supply unit that supplies a detection gas to the partial space is attached, and the airtightness of the power storage module is determined based on a detection result by the detection unit when the detection gas is supplied from the detection gas supply unit to the second internal space. Inspect.

  In this power storage module inspection method, a detection unit for detecting a detection gas is attached to the first internal space. In addition, a detection gas supply unit that supplies the detection gas to the second internal space adjacent to the first internal space in the stacking direction is attached. Here, when the airtightness between the first internal space and the second internal space is ensured, even if the detection gas is supplied to the second internal space, the detection unit in the first internal space The detection gas is not detected above the detection reference value. On the other hand, when the airtightness between the first internal space and the second internal space is not ensured, the detection gas is supplied to the second internal space, so that the detection unit in the first internal space By means of this, a detection gas equal to or higher than the detection reference value is detected. Therefore, the airtightness between the first internal space and the second internal space is obtained by performing an inspection based on the detection result by the detection unit when the detection gas is supplied from the detection gas supply unit to the second internal space. Can be easily inspected. As described above, the airtightness of the power storage module can be easily inspected.

  The detection unit and the detection gas supply unit may be alternately and continuously attached to the plurality of internal spaces. As described above, when the detection units and the detection gas supply units are alternately and continuously provided for a plurality of internal spaces, the one internal space to which the detection units are attached is the internal space to which the detection gas is supplied. Thus, it is sandwiched from both sides in the stacking direction. Therefore, by simultaneously supplying the detection gas from the detection gas supply units on both sides, it is possible to simultaneously inspect the airtightness between the one internal space in which the detection units are attached and the internal spaces on both sides.

  When the detection unit and the detection gas supply unit are alternately and continuously mounted in the n-layer internal space, a value that is (n-1) times the standard value, which is the standard for the amount of leakage per layer, is detected. It may be set as a reference value. In this case, when the airtightness inspection by the detection unit and the detection gas supply unit is simultaneously performed on the internal space of the n layer, the airtightness inspection may be performed with an appropriate detection reference value according to the number of layers. it can.

  In the present specification, “airtightness” refers to a performance that does not leak to other spaces when gas is sealed in the internal space. Since gas is more likely to leak than liquid, the state where “airtightness” is ensured includes the state where sealing performance against liquid is ensured. “Airtightness” may be rephrased as “sealability”.

  According to one aspect of the present invention, a method for inspecting a power storage module that can easily check the airtightness of the power storage module can be provided.

It is a schematic sectional drawing which shows one Embodiment of an electrical storage apparatus provided with an electrical storage module. It is a schematic sectional drawing which shows the electrical storage module which comprises the electrical storage apparatus of FIG. It is a schematic perspective view which shows the electrical storage module of FIG. FIG. 4 is an enlarged plan view of a part of the power storage module of FIG. 3. It is a flowchart which shows the content of the test | inspection method of an electrical storage module. It is a conceptual diagram for demonstrating the content of the test | inspection process shown in FIG. It is a schematic perspective view which shows the electrical storage module which concerns on a modification. It is the top view to which a part of electrical storage module of FIG. 7 was expanded. It is a disassembled perspective view of the pressure control valve connected to opening of the frame shown in FIG. It is a schematic sectional drawing which shows the structure of the pressure control valve shown in FIG. It is a flowchart which shows the content of the test | inspection method of an electrical storage module. It is a conceptual diagram for demonstrating the content of the test | inspection process shown in FIG. It is sectional drawing which shows an example of the attachment aspect of a pressure measurement part. It is a flowchart which shows the content of the test | inspection method of an electrical storage module. It is a conceptual diagram for demonstrating the content of the test | inspection process shown in FIG. It is a figure for demonstrating a detection reference value.

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

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

  The plurality of power storage modules 12 can be stacked via a conductive plate 14 such as a metal plate. When viewed from the stacking direction, the power storage module 12 and the conductive plate 14 have, for example, a rectangular shape. Details of each power storage module 12 will be described later. The conductive plates 14 are also arranged outside the power storage modules 12 positioned at both ends in the stacking direction (Z direction) of the power storage modules 12. The conductive plate 14 is electrically connected to the adjacent power storage module 12. Thereby, the some electrical storage module 12 is connected in series in the lamination direction. In the stacking direction, a positive electrode terminal 24 is connected to the conductive plate 14 located at one end, and a negative electrode terminal 26 is connected to the conductive plate 14 located at the other end. The positive terminal 24 may be integrated with the conductive plate 14 to be connected. The negative electrode terminal 26 may be integrated with the conductive plate 14 to be connected. The positive electrode terminal 24 and the negative electrode terminal 26 extend in a direction (X direction) intersecting the stacking direction. The positive and negative terminals 24 and 26 can charge and discharge the power storage device 10.

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

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

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

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

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

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

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

  The electrode plate 34 is a rectangular metal foil made of nickel, for example. The edge 34 a of the electrode plate 34 is an uncoated region where the positive electrode active material and the negative electrode active material are not coated, and the uncoated region is buried in the first resin portion 52 constituting the inner wall of the frame body 50. It is an area to be held. An example of the positive electrode active material constituting the positive electrode 36 is nickel hydroxide. Examples of the negative electrode active material constituting the negative electrode 38 include a hydrogen storage alloy. The formation region of the negative electrode 38 on the other surface of the electrode plate 34 is slightly larger than the formation region of the positive electrode 36 on one surface of the electrode plate 34.

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

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

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

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

  As shown in FIG. 4, the first liquid injection port 50 </ b> Aa includes a first opening 52 </ b> Aa provided in any one of the plurality of first resin parts 52, and a second opening 54 </ b> Aa provided in the second resin part 54. Can have. The first opening 52Aa communicates with the internal space of the power storage module 12 and the second opening 54Aa. For example, the first opening 52Aa communicates with the internal space V between the adjacent bipolar electrodes 32 (see FIG. 2). The first liquid injection port 50Aa has a plurality of first openings 52Aa. The second resin portion 54 is provided with a single second opening 54Aa that extends so as to cover the plurality of first openings 52Aa. One or a plurality of first openings 52Aa may be provided for one first resin portion 52, or one or a plurality of first openings 52Aa are provided at a boundary portion between adjacent first resin portions 52. May be. Each first opening 52Aa has a rectangular shape, for example, and each second opening 54Aa has a rectangular shape, for example. However, the shape of each opening is not particularly limited.

  The second liquid injection port 50Ba includes a third opening 52Ba provided in the first resin portion 52 different from the first opening 52Aa among the plurality of first resin portions 52, and a second of the second resin portions 54. It may have a fourth opening 54Ba provided at a location different from the opening 54Aa. The third opening 52Ba communicates with the internal space of the power storage module 12 and the fourth opening 54Ba. For example, the third opening 52Ba communicates with the internal space V between the adjacent bipolar electrodes 32 (see FIG. 2). The second liquid injection port 50Ba has a plurality of third openings 52Ba. The second resin portion 54 is provided with a single fourth opening 54Ba extending so as to cover the plurality of third openings 52Ba. One or a plurality of third openings 52Ba may be provided for one first resin portion 52, or one or a plurality of third openings 52Ba are provided at a boundary portion between adjacent first resin portions 52. May be. The shape of each third opening 52Ba is, for example, a rectangle, and the shape of the fourth opening 54Ba is, for example, a rectangle. However, the shape of each opening is not particularly limited.

  Of the internal space of the electricity storage module 12, a portion communicated with the first liquid injection port 50Aa and a portion communicated with the second liquid injection port 50Ba are sealed. A plurality of internal spaces V between adjacent bipolar electrodes 32 are formed in the storage module 12 in the stacking direction, and each internal space V (after the liquid injection ports 50Aa and 50Ba are sealed) is independent of each other. Thus, the airtightness is ensured (see FIG. 2). Among these internal spaces V, first openings 52Aa are formed for the internal spaces V corresponding to the first liquid injection port 50Aa. Thereby, the internal space V corresponding to the first liquid injection port 50Aa is in a state of communicating with each other through the first opening 52Aa and the second opening 54Aa. On the other hand, among the internal spaces V, the third openings 52Ba are formed for the internal spaces V corresponding to the second liquid injection port 50Ba. As a result, the internal space V corresponding to the second liquid inlet 50Ba is in a state of communicating with each other via the third opening 52Ba and the fourth opening 54Ba. The first liquid inlet 50Aa and the second liquid inlet 50Ba are not in communication with each other and are in a sealed state. Therefore, the internal space V corresponding to the first liquid injection port 50Aa (portion communicated with the first liquid injection port 50Aa) and the internal space V corresponding to the second liquid injection port 50Ba (communication with the second liquid injection port 50Ba). Are not in communication with each other, and are in a sealed state. In the present embodiment, the first openings 52Aa and the third openings 52Ba are alternately formed for the plurality of first resin portions 52 stacked in the stacking direction. Accordingly, the internal space V corresponding to the first liquid injection port 50Aa (portion communicated with the first liquid injection port 50Aa) and the internal space V corresponding to the second liquid injection port 50Ba (in the second liquid injection port 50Ba). The connected portions) alternately exist in the stacking direction.

  Next, with reference to FIG.5 and FIG.6, the test | inspection method of the electrical storage module which concerns on this embodiment is demonstrated. FIG. 5 is a flowchart showing the contents of the storage module inspection method. FIG. 6 is a conceptual diagram for explaining the contents of the inspection process shown in FIG. In this inspection method, the airtightness of the power storage module 12 is inspected. This inspection method includes a preparation step S10 for preparing the power storage module 12, and an inspection step S20 for inspecting the airtightness of the power storage module 12. In the preparation step S10, the power storage module 12 in the state in which the first injection port 50Aa and the second injection port 50Ba are formed in the frame body 50 as described in FIGS. 3 and 4 is prepared.

  In the inspection step S20, the airtightness inspection of the power storage module 12 is performed based on the change in the thickness of the power storage module 12 due to the flow of fluid into the first liquid inlet 50Aa and the second liquid inlet 50Ba. Further, in the inspection step S20, the storage module 12, the first injection port 50Aa, and the second injection solution having a thickness increased by flowing a fluid into the first injection port 50Aa and the second injection port 50Ba. The airtightness of the power storage module 12 is inspected by measuring the difference in thickness between the power storage module 12 and the thickness of the power storage module 12 decreased by flowing a fluid out of either one of the ports 50Ba. That is, in the inspection step S20, the airtightness of the electricity storage module 12 is inspected based on the thickness of the electricity storage module 12 in a state where fluid is sealed from only one of the first injection port 50Aa and the second injection port 50Ba. To do.

  In addition, in order to demonstrate the procedure of inspection process S20, a schematic diagram like FIG. 6 is shown. In FIG. 6, four stacked units 60A, 60B, 60C, and 60D are shown. The stacked units 60A, 60B, 60C, 60D are unit units each having one internal space V. After the first injection port 50Aa and the second injection port 50Ba are sealed, the stacked units 60A, 60B, 60C, 60D are separated without communicating with the internal space V of the other stacked units, and are airtight. Are secured independently. Before sealing the first liquid injection port 50Aa, the first opening 52Aa is formed in the stacked unit 60A and the stacked unit 60C. That is, the multilayer unit 60A and the multilayer unit 60C are communicated with the first liquid injection port 50Aa. Before sealing the second liquid injection port 50Ba, a third opening 52Ba is formed in the stacked unit 60B and the stacked unit 60D. That is, the multilayer unit 60B and the multilayer unit 60D are communicated with the second liquid injection port 50Ba. In FIG. 6, among the stacked units 60 </ b> A, 60 </ b> B, 60 </ b> C, and 60 </ b> D, the one in which the gas (fluid) is sealed and the thickness is increased is hatched.

  In the initial stage of the inspection step S20, the first injection port 50Aa and the second injection port 50Ba are open to the atmosphere, and no gas is sealed in the stacked units 60A, 60B, 60C, 60D. (See FIG. 6 (a)). In this state, the entire thickness of the power storage module 12 is the thickness t0.

  In the inspection step S20, first, gas is sealed from both the liquid injection ports 50Aa and 50Ba (step S1). As a result, gas is sealed in all of the stacked units 60A, 60B, 60C, and 60D, thereby increasing the respective thicknesses (see FIG. 6B). The thickness of the power storage module 12 at this time is measured (step S2). The power storage module 12 at this time has a thickness t1 (thickness t1> thickness t0).

  Next, one of the first liquid inlet 50Aa and the second liquid inlet 50Ba is opened to the atmosphere (step S3). As a result, the sealed gas flows out from the stacked unit corresponding to the liquid injection port opened to the atmosphere. Therefore, the thickness of the laminated unit is reduced. In FIG. 6C, the thickness of the stacked units 60A and 60C is reduced by opening the first injection port 50Aa to the atmosphere, and the thickness of the stacked units 60B and 60D is maintained in a thick state.

  Next, the thickness of the power storage module 12 in a state where the gas is sealed only in some of the stacked units is measured (step S4). The thickness of the power storage module 12 at this time is the thickness t2 (thickness t1> thickness t2> thickness t0). When there is no problem in the airtightness of the power storage module 12, “thickness t 1 -thickness t 2” is the thickness of the gas sealed in the laminated unit corresponding to the liquid injection port released to the atmosphere. Moreover, the said value can be prepared beforehand before a test | inspection. Therefore, when the actually measured thickness t2 is smaller than the value prepared in advance, that is, when the actually measured value of “thickness t1−thickness t2” is larger than the prepared value, the injected liquid released into the atmosphere It can be known that gas is leaking from other than the laminated unit corresponding to the mouth.

  For example, when there is a problem in the airtightness between the laminated unit corresponding to the liquid injection port that is not open to the atmosphere and the outside, the gas in the laminated unit leaks to the outside. -The value of "thickness t2" is larger than the prepared value (or smaller than the prepared value of thickness t2). Alternatively, when there is a problem with the airtightness between the laminated unit corresponding to the first liquid inlet 50Aa and the laminated unit corresponding to the second liquid inlet 50Ba, the gas in the laminated unit that is not open to the atmosphere However, since it leaks to the outside through the laminated unit that is open to the atmosphere, the actually measured value of “thickness t1−thickness t2” is larger than the prepared value (or the thickness t2 is prepared. Smaller than the previous value).

  Next, gas is sealed in the liquid injection port that has been released to the atmosphere in step S3 (step S5). As a result, the gas is again sealed in all the laminated units. The thickness of the power storage module 12 in this state is measured (step S6). Then, the other liquid inlet that has not been released to the atmosphere in step S3 is released to the atmosphere (step S7). Next, the thickness of the laminated unit in a state where the laminated unit corresponding to the other liquid injection port is thin is measured (step S8). Steps S7 and S8 are the same as steps S3 and S4 except that the opening to be released to the atmosphere is different. When the process of step S8 ends, the inspection step S20 ends, and the inspection shown in FIG. 5 ends. At this time, if there is a problem with the airtightness of the power storage module 12, the power storage module 12 may be removed from the production line. On the other hand, for the power storage module 12 having no problem in airtightness, the electrolytic solution is sealed from the first injection port 50Aa and the second injection port 50Ba, and the first injection port 50Aa and the second injection port 50Ba are sealed. Is done.

  Next, operations and effects of the inspection method for the power storage module 12 according to the present embodiment will be described.

  In the power storage module 12 inspection method according to the present embodiment, in the power storage module 12 prepared in the preparatory step S10 of the power storage module 12, a first step for injecting an electrolyte into the frame 50 is performed on the frame 50. A first liquid inlet 50Aa and a second liquid inlet 50Ba are provided at least. The first liquid injection port 50Aa has a first opening 52Aa provided in any one of the plurality of first resin parts 52 and a second opening 54Aa provided in the second resin part 54. ing. The first opening 52Aa communicates with the internal space V of the power storage module 12 and the second opening 54Aa. With such a configuration, a part of the internal space of the power storage module 12 is in communication with the first liquid injection port 50Aa. On the other hand, the second liquid injection port 50Ba includes a third opening 52Ba provided in the first resin portion 52 different from the first opening 52Aa among the plurality of first resin portions 52, and the second resin portion 54. And a fourth opening 54Ba provided at a location different from the second opening 54Aa. The third opening 52Ba communicates with the internal space V of the power storage module 12 and the fourth opening 54Ba. With such a configuration, the other part of the internal space of the power storage module 12 that is not in communication with the first liquid inlet 50Aa is in a state of being in communication with the second liquid inlet 50Ba. Of the internal space of the power storage module 12 provided with the first liquid inlet 50Aa and the second liquid inlet 50Ba, a portion communicated with the first liquid inlet 50Aa and the second liquid inlet 50Ba communicate with each other. The space between the formed portions is sealed. Therefore, when the fluid flows in and out from the first liquid injection port 50Aa, if there is no problem with airtightness, only the thickness of the portion corresponding to the first liquid injection port 50Aa in the power storage module 12 is a predetermined amount. Change. Similarly, when the fluid flows in and out from the second liquid inlet 50Ba, if there is no problem with airtightness, only the thickness of the portion corresponding to the second liquid inlet 50Ba in the power storage module 12 is a predetermined amount. Only changes. The power storage module 12 in such a state is prepared, and an inspection step S20 for inspecting the airtightness of the prepared power storage module 12 is performed. In the inspection step S20, the airtightness of the electricity storage module 12 is inspected based on the change in the thickness of the electricity storage module 12 due to the inflow of fluid into the first injection port 50Aa and the second injection port 50Ba. As described above, when there is no problem in airtightness, only the thickness of the portion of the power storage module 12 corresponding to the first liquid injection port 50Aa changes by a predetermined amount due to the inflow of fluid to the first liquid injection port 50Aa. The relationship in which only the thickness of the portion of the power storage module 12 corresponding to the second liquid inlet 50Ba changes by a predetermined amount due to the inflow of fluid into the second liquid inlet 50Ba is established. That is, when the relationship does not hold, it can be understood that there is a problem with the airtightness of the power storage module 12. As described above, the airtightness test can be easily performed based on the change in the thickness of the power storage module 12 without using a complicated device or a test method. As described above, the airtightness of the power storage module 12 can be easily inspected.

  In the inspection step S20, the fluid is caused to flow into the first liquid inlet 50Aa and the second liquid inlet 50Ba to increase the thickness of the power storage module 12, and either the first liquid inlet 50Aa or the second liquid inlet 50Ba After the fluid is allowed to flow out from the one side to reduce the thickness of the power storage module 12, the airtightness of the power storage module 12 is inspected based on the thickness of the power storage module 12. When there is no problem in the airtightness of the electricity storage module 12, after the fluid flows into the first injection port 50Aa and the second injection port 50Ba, the first injection port 50Aa and the second injection port 50Ba When the fluid is caused to flow out from either one, the relationship in which only the decrease in the thickness of the portion corresponding to the liquid injection port that has flowed out becomes the decrease in the thickness of the power storage module 12 is established. That is, when the relationship does not hold, it can be understood that there is a problem with the airtightness of the power storage module 12.

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

  For example, the configuration of the power storage device is not limited to the configuration shown in FIGS. That is, as long as it has the structure which can implement the manufacturing structure of this invention, you may change a structure suitably.

  For example, the following inspection process may be added to the above process. For example, in the inspection step S20, by increasing the thickness of the power storage module 12 by flowing a fluid into the first liquid inlet 50Aa and the second liquid inlet 50Ba, and measuring the thickness of the power storage module 12, You may test | inspect the airtightness of the electrical storage module 12. FIG. When the fluid leaks from the power storage module 12 to the outside, the power storage module 12 does not increase to a predetermined amount when the fluid flows into the first liquid inlet 50Aa and the second liquid inlet 50Ba. Therefore, by measuring the thickness of the power storage module 12, it can be understood that there is a problem in the airtightness of the power storage module.

  Further, the number of liquid injection ports is not limited to two as shown in the above-described embodiment, and three or more liquid injection ports may be provided.

  Further, the inspection method is not limited to the above-described embodiment, and the following inspection method may be adopted.

  First, the structure of the electrical storage module which concerns on a modification is demonstrated with reference to FIGS. FIG. 7 is a schematic perspective view showing the power storage module of FIG. FIG. 8 is an enlarged plan view of a part of the power storage module in FIG. 7 (a peripheral region of one opening 50a). As shown in FIGS. 7 and 8, the frame 50 of the power storage module 12 has a side surface 50s extending in the stacking direction D1. The side surface 50s is a surface located outside as viewed from the stacking direction D1. Therefore, the second resin portion 54 has the side surface 50 s of the frame body 50.

  The side surface 50s of the frame 50 has a main body region 50s1 and a protruding region 50s2. Each of the main body region 50s1 and the protruding region 50s2 has a rectangular shape, for example. An opening 50a is provided in the main body region 50s1. The opening 50a functions as a liquid injection port for injecting the electrolyte into each internal space V, and after the electrolyte is injected, the pressure adjusting valve 160 (for adjusting the pressure in each internal space V) It functions as a connection port in detail). In the present embodiment, the frame 50 has a plurality (here, four) of openings 50a (openings 50a1 to 50a4). Specifically, two openings 50 a are provided on each side surface 50 s facing the longitudinal direction (X direction) of the frame body 50.

  The main body region 50 s 1 has an edge E extending in a direction (Y direction) intersecting the stacking direction D 1 of the bipolar electrode 32. The protruding region 50s2 protrudes from the edge E so as to be separated from the opening 50a in the stacking direction D1 of the bipolar electrode 32. In the present embodiment, the pair of protruding regions 50s2 are arranged so as to sandwich the opening 50a. The protruding region 50s2 is provided with a length that extends beyond the entire length of the opening 50a along the edge E and protrudes from both sides of the opening 50a.

  As shown in FIG. 8, one opening 50 a may have a first opening 52 a provided in the first resin portion 52 and a second opening 54 a provided in the second resin portion 54. Each first opening 52a communicates with the internal space V between the adjacent bipolar electrodes 32 and the second opening 54a. The first resin part 52 is provided with a plurality of first openings 52a, and the second resin part 54 is provided with a single second opening 54a that extends so as to cover the plurality of first openings 52a. . The first opening 52 a may be provided in each first resin portion 52, or may be provided between adjacent first resin portions 52. Each of the first openings 52a and the second openings 54a has a rectangular shape, for example.

  In the present embodiment, 56 internal spaces V are formed in the power storage module 12, and one opening 50 a communicates with 14 internal spaces V. That is, each internal space V communicates with any one of the four openings 50a1 to 50a4. As shown in FIG. 8, in one opening 50a (here, as an example, opening 50a1), 14 first openings 52a are arranged in two rows in the short direction (Y direction) of the frame 50. ing. In each row, seven first openings 52a are arranged along the stacking direction D1. The 14 first openings 52a are arranged point-symmetrically with respect to the center P1 of the second opening 54a when viewed from the opening direction (X direction) of the opening 50a.

  For example, the arrangement of the plurality of first openings 52a in each opening 50a (that is, the arrangement configuration in which the set of internal spaces V communicating with each opening 50a is different) may be determined as follows. In the following description, for the sake of convenience, in order to identify the 56 internal spaces V, the internal space V1 is arranged in the order from the other end (the lower side in FIG. 2) to the one end (the upper side in FIG. 2) of the stacked body 30. This is expressed as ~ V56.

  For example, in the opening 50 a 1, the seven first openings 52 a arranged in the first row (the left side in the drawing in FIG. 8, the same applies hereinafter) are skipped eight steps from the other end side of the stacked body 30 to the internal space V 1. , V9, V17, V25, V33, V41, V49, and the seven first openings 52a arranged in the second row (the right side column in FIG. It is provided so as to communicate with the internal spaces V56, V48, V40, V32, V24, V16, and V8 in eight steps from one end side of 30. Here, since the first opening 52a is provided at a height position (position in the stacking direction D1) corresponding to the internal space V communicating with the first opening 52a, according to the above arrangement, the above point-symmetric arrangement is provided. Is realized.

  With respect to the openings 50a2 to 50a4, for example, a point-symmetric arrangement can be realized similarly to the opening 50a1 by shifting the set of the internal space V to be communicated one step at a time with respect to the opening 50a1. Specifically, in the opening 50a2, the seven first openings 52a arranged in the first row are provided so as to communicate with the internal spaces V2, V10, V18, V26, V34, V42, V50, and the second The seven first openings 52a arranged in a row may be provided so as to communicate with the internal spaces V55, V47, V39, V31, V23, V15, and V7. In the opening 50a3, the seven first openings 52a arranged in the first row are provided so as to communicate with the internal spaces V3, V11, V19, V27, V35, V43, and V51, and are arranged in the second row. The seven first openings 52a may be provided so as to communicate with the internal spaces V54, V46, V38, V30, V22, V14, and V6. In the opening 50a4, the seven first openings 52a arranged in the first row are provided so as to communicate with the internal spaces V4, V12, V20, V28, V36, V44, and V52, and are arranged in the second row. The seven first openings 52a may be provided so as to communicate with the internal spaces V53, V45, V37, V29, V21, V13, and V5.

  According to the arrangement of the first openings 52a as described above (that is, the correspondence between the first openings 52a and the internal spaces V), it is possible to realize a configuration in which all the internal spaces V communicate with the first openings 52a different from each other. A point-symmetric arrangement as described above can be realized for all the openings 50a1 to 50a4.

  FIG. 9 is an exploded perspective view of the pressure regulating valve 160 connected to the opening 50 a of the frame 50. FIG. 10 is a schematic cross-sectional view showing the configuration of the pressure regulating valve 160. Specifically, FIG. 10 shows seven first openings 52a (first openings 52a communicating with the internal spaces V1, V9, V17, V25, V33, V41, and V49) arranged in the first row of the openings 50a1. It is sectional drawing containing a cross section. As shown in FIGS. 9 and 10, the pressure adjustment valve 160 includes a first base member 70, a second base member 80, a valve body 90 (elastic member), and a cover member 150 (pressing member). doing.

  The first base member 70 has a substantially rectangular parallelepiped outer shape, and is formed of, for example, polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), or the like. The first base member 70 is connected to the opening 50a. Specifically, the portion 72 including the side surface 71 (first side surface) facing the opening 50a of the first base member 70 has a shape corresponding to the second opening 54a. The first base member 70 is opened by welding a part or all of the contact portion between the side surface 71 and the side surface 52s of the first resin portion 52 in a state where the portion 72 is inserted into the second opening 54a. It is fixed with respect to 50a. The welding of the side surface 71 and the side surface 52s is performed by, for example, hot plate welding, laser transmission welding, ultrasonic welding, or the like.

  As shown in FIG. 10, the first base member 70 is provided with a plurality (14 in this case) of first communication holes 74 penetrating from the side surface 71 to the side surface 73. Each first communication hole 74 communicates with one internal space V through one corresponding first opening 52a. The first communication hole 74 includes a first communication portion 75 that is a side surface 71 side portion of the first communication hole 74 and a second communication portion 76 that is a side surface 73 side portion of the first communication hole 74.

  The first communication part 75 is formed in a rectangular cross section. A substantially rectangular parallelepiped space S <b> 1 is formed by the first communication portion 75. The opening end 75a on the opening 50a side of the first communication portion 75 is formed in a size including the rectangular first opening 52a when viewed from the connection direction D2 (X direction) between the opening 50a and the first base member 70. ing. On the other hand, the opening end 75b on the side connected to the second communication portion 76 of the first communication portion 75 is formed in a circular cross section. The inner diameter of the open end 75b is the same as the width d1 of the open end 75a in the stacking direction D1.

  The second communication portion 76 is formed in a circular cross section. The second communication portion 76 penetrates from the opening end 75 b of the first communication portion 75 to the opening end 76 a on the side surface 73 side of the second communication portion 76. The open end 76a is formed in a circular shape. The inner diameter d3 of the opening end 76a is larger than the inner diameter of the opening end 75b (that is, the width d1 of the opening end 75a in the stacking direction D1) (d3> d1). That is, the second communication portion 76 forms a tapered space S2 having an inner diameter that increases from the opening end 75b toward the opening end 76a. Such a 2nd communication part 76 may be formed by injection molding etc., for example.

  Further, in the present embodiment, as shown in FIG. 10, the second communication portion 76 connected to the seven first openings 52a in the first row has a center position of the opening end 76a rather than a center position of the opening end 75b. Extends so as to be located above. On the other hand, the second communicating portion 76 connected to the seven first openings 52a in the second row extends so that the center position of the opening end 76a is located below the center position of the opening end 75b. As a result, the plurality of open ends 76 a are brought close to the center position of the side surface 73.

  The second base member 80 has a substantially rectangular parallelepiped outer shape, and is joined to the side surface 73 of the first base member 70 on one side surface 81. The side surface 81 and the side surface 73 can be welded by, for example, hot plate welding. In the present embodiment, the second base member 80 is slightly larger than the first base member when viewed from the connection direction D2, but the second base member 80 is the same size as the first base member. The first base member may be formed smaller than the first base member.

  As shown in FIG. 10, the second base member 80 is provided with a plurality of (here, 14) second communication holes 83 that penetrate from the side surface 81 to the side surface 82. The second communication hole 83 is formed in a circular cross section. Each second communication hole 83 communicates with one internal space V via a corresponding first communication hole 74. The inner diameter of the opening end 83 a on the first base member 70 side of the second communication hole 83 coincides with the inner diameter d3 of the opening end 76 a of the first communication hole 74. The first base member 70 and the second base member 80 are joined so that the opening end 76a and the opening end 83a corresponding to each other as seen from the connection direction D2 overlap each other. The inner diameter d4 of the opening end 83b on the valve body 90 side of the second communication hole 83 is smaller than the inner diameter of the opening end 83a (that is, the inner diameter d3 of the opening end 76a) (d4 <d3). That is, the second communication hole 83 forms a tapered space S3 having an inner diameter that decreases from the opening end 83a toward the opening end 83b. Such a second communication hole 83 can be formed by, for example, injection molding or the like. Note that the inner diameter of the opening end 83a and the inner diameter d3 of the opening end 76a do not have to coincide with each other. For example, when the inner diameter of the open end 83a is made smaller than the inner diameter d3, an effect of allowing a positional shift at the time of joining can be achieved.

  The valve body 90 is formed of an elastic member such as rubber. The valve body 90 has a rectangular parallelepiped shape, for example. The valve body 90 is disposed so as to block a plurality of opening ends 83 b provided in the second base member 80.

  The cover member 150 is a box-shaped member having a rectangular plate-like bottom wall portion 101 and a side wall portion 102 erected on the edge of the bottom wall portion 101. The cover member 150 is made of, for example, polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), or the like. On the inner side of the bottom wall portion 101, a groove portion 103 that is recessed in a concave shape for positioning the valve body 90 is provided. The cover member 150 accommodates the valve body 90 in the groove portion 103 and functions as a pressing member for pressing the valve body 90 against the side surface 82 of the second base member 80. Specifically, as shown in FIG. 10, the end portion 102 a of the side wall portion 102 is formed on the side surface 82 of the second base member 80 in a state where the valve body 90 is positioned and accommodated in the groove portion 103 of the cover member 150. It is fixed against. A method for fixing the end portion 102a and the side surface 82 is not particularly limited. For example, laser welding, hot plate welding, and fastening using a fastening member such as a bolt can be used. For example, in the case of using laser welding, the cover member 150 is formed of a laser transmitting resin, the second base member 80 is formed of a laser absorbing resin, and the laser is irradiated from the cover member 150 side. The boundary portion between the base member 80 and the cover member 150 can be melted and joined.

  Here, the thickness (width in the X direction) of the valve body 90 at the normal time (non-compressed) is larger than the height d5 from the bottom surface 103a of the groove portion 103 to the end portion 102a of the side wall portion 102. That is, the compression rate of the valve body 90 is defined by the height d5. The compression rate of the valve body 90 is, for example, when the pressure in the second communication hole 83 (that is, the pressure in the internal space V communicated with the second communication hole 83) is equal to or higher than a predetermined set value. The valve body 90 is adjusted in advance so that the opening end 83b of the second communication hole 83 is released.

  On the side surface 82 side of the second base member 80, groove portions 84 corresponding to the respective open ends 83b are provided. Each groove portion 84 is formed in a slit shape extending in a direction (X direction and Y direction) orthogonal to the stacking direction D1. Each groove portion 84 is provided at a position outside the corresponding opening end 83b in the direction (Y direction) orthogonal to the stacking direction D1 and the connection direction D2. In addition, the second base member 80 is provided with an exhaust port 85 that allows the circulation space S4 to communicate with the outside. In the present embodiment, the outer opening end of the exhaust port 85 is provided on the side surface 86 that faces in a direction perpendicular to the connection direction D2 of the second base member 80 (Y direction as an example in the present embodiment).

  The second base member 80 is connected to a plurality of (here, seven) groove portions 84 as viewed from the direction facing the side surface 82 (X direction), and a circulation space S4 through which the gas discharged from the internal space V circulates. Is defined. The distribution space S4 is formed in a substantially rectangular parallelepiped shape. The circulation space S4 extends in the stacking direction D1 so as to connect the outer end portions of the seven groove portions 84 arranged along the stacking direction D1 when viewed from the direction facing the side surface 82. The plurality of grooves 84 and the distribution space S4 are formed by, for example, injection molding. In addition, the second base member 80 is provided with an exhaust port 85 that allows the circulation space S4 to communicate with the outside. In the present embodiment, the outer opening end of the exhaust port 85 is provided on the side surface 86 that faces in a direction perpendicular to the connection direction D2 of the second base member 80 (Y direction as an example in the present embodiment). According to this configuration, the gas discharged into the one groove portion 84 according to the increase in the pressure in the internal space V flows into the circulation space S4 provided in common to the plurality of groove portions 84, and is externally supplied from the exhaust port 85. To be discharged. Therefore, the gas generated in the internal space V can be appropriately discharged to the outside with a simple configuration.

  Next, an inspection method for the power storage module 12 according to the modification will be described with reference to FIGS. FIG. 11 is a flowchart showing the contents of the storage module inspection method. FIG. 12 is a conceptual diagram for explaining the contents of the inspection process shown in FIG. FIG. 13 is a cross-sectional view illustrating an example of an attachment mode of the pressure measurement unit. This inspection method includes a preparation step S110 for preparing the power storage module 12, and an inspection step S150 for inspecting the airtightness of the power storage module 12. The inspection step S150 includes a measurement preparation step S120 for preparing the pressure measurement unit 100 and the fluid supply unit 130, a fluid supply step S130 for supplying fluid from the fluid supply unit 130 to the internal space, and a measurement result of the pressure measurement unit 100. Determination step S140 for determining the airtightness based on (see FIG. 11).

  In the preparation step S110, as described in FIG. 7 described above, the storage module 12 in which the openings 50a1 to 50a4 are formed in the frame 50 is prepared by attaching the first base member 70.

  In the measurement preparation step S120, the pressure measurement unit 100 and the fluid supply unit 130 are attached to each internal space V of the power storage module 12. The pressure measuring unit 100 measures the pressure of the internal space V related to the attachment target. The pressure measurement unit 100 includes a pipe 120 that communicates with the internal space V, and a pressure gauge 110 that measures the pressure in the internal space V via the pipe 120. Specifically, the pipe 120 is attached to the opening end 76a of the first base member 70, and the pressure gauge 110 capable of measuring the inside of the pipe 120 is attached (see FIG. 13). For example, the fluid supply unit 130 may be configured by attaching a pipe to the open end 76a of the first base member 70 and providing a fluid supply mechanism such as a pump in the pipe.

  The pressure measurement unit 100 and the fluid supply unit 130 are provided for the plurality of internal spaces V of the power storage module 12. Here, for explanation, a schematic diagram as shown in FIG. 12 is used. In FIG. 12, eight stacked units 60A, 60B, 60C, 60D, 60E, 60F, 60G, and 60H are shown. The stacked units 60A, 60B, 60C, 60D, 60E, 60F, 60G, and 60H are unit units each having one internal space VA, VB, VC, VD, VE, VF, VG, and VH. After the openings 50a1 to 50a4 are sealed, the stacked units 60A, 60B, 60C, 60D, 60E, 60F, 60G, and 60H are separated without communicating with the internal space V of the other stacked units, and the airtightness is increased. It becomes a state secured independently. The internal spaces VA, VB, VC, VD, VE, VF, VG, and VH correspond to any one of the plurality of internal spaces V that are continuous in the stacking direction among the internal spaces V1 to V56 described above. .

  In the present embodiment, the pressure measurement unit 100 and the fluid supply unit 130 are alternately attached to the plurality of internal spaces VA, VB, VC, VD, VE, VF, VG, and VH. Specifically, pressure measuring units 100A, 100C, 100E, and 100G are attached to the internal spaces VA, VC, VE, and VG. Fluid supply portions 130B, 130D, 130F, and 130H are attached to the internal spaces VB, VD, VF, and VH adjacent to the internal spaces VA, VC, VE, and VG in one of the stacking directions (downward in FIG. 12). . In such an attachment mode, when the internal space VA is the “first internal space” in the claims, the internal space VB adjacent to the internal space VA in the stacking direction is the “second internal space” in the claims. The internal space VC adjacent to one of the internal spaces VB in the stacking direction corresponds to the “third internal space” in the claims, and the internal space VD adjacent to one of the internal spaces VC in the stacking direction is charged. This corresponds to “fourth internal space” in the section. Further, the pressure measuring unit 100A corresponds to the “first pressure measuring unit” in the claims, the pressure measuring unit 100C corresponds to the “second pressure measuring unit” in the claims, and the fluid supply unit 130B is in the claims. Corresponding to “first fluid supply unit”, fluid supply unit 130D corresponds to “second fluid supply unit” in the claims. It should be noted that any of the internal spaces VC, VE, and VG may be regarded as “first internal space” in the claims. Further, the upper side in the figure may be regarded as one side in the stacking direction. In that case, the correspondence of each component in the claims is appropriately changed.

  In the fluid supply step S130, the fluid supply units 130B, 130D, 130F, and 130H supply fluid to the internal spaces VB, VD, VF, and VH. At this time, the fluid supply units 130B, 130D, 130F, and 130H supply fluids at pressures PB, PD, PF, and PH, respectively. The pressures PB, PD, PF, and PH may be the same pressure or different pressures. When the fluid supply step S130 is completed, the pressures in the internal spaces VA, VC, VE, and VG measured by the pressure measuring units 100A, 100, 100E, and 100G are acquired. The pressures in the internal spaces VA, VC, VE, and VG can be acquired from the measurement results of the pressure gauges 110A, 110C, 110E, and 110G.

  In the determination step S140, the airtightness of the power storage module 12 is inspected based on the pressures in the internal spaces VA, VC, VE, and VG measured by the pressure measuring units 100A, 100, 100E, and 100G. For example, when the pressure of the internal space VC changes when the fluid supply unit 130B supplies the fluid to the internal space VB, it is determined that there is a problem with the airtightness between the internal space VB and the internal space VC, When there is no change in the pressure of the internal space VC, it can be determined that the airtightness between the internal space VB and the internal space VC is secured. The determination of the same meaning can be made for other internal spaces V.

  As described above, in the inspection step S150, measurement is performed by the pressure measuring units 100A, 100C, 100E, and 100G when the fluid is supplied from the fluid supply units 130B, 130D, 130F, and 130H to the internal spaces VB, VD, VF, and VH. Based on the pressures of the internal spaces VA, VC, VE, and VG, the airtightness of the power storage module 12 is inspected.

  The order of the fluid supply by each fluid supply unit 130 and the pressure measurement by the pressure measurement unit 100 is not particularly limited. For example, the fluid may be supplied from all the fluid supply units 130 simultaneously, and the pressure may be measured simultaneously by all the pressure measurement units 100. Alternatively, one or several pressure measuring units 100 may be measured. At this time, the fluid may be supplied only from the fluid supply unit 130 corresponding to the pressure measurement unit 100 related to the measurement target. For example, when the pressure is measured by the pressure measurement unit 100A, the fluid may be supplied only from the fluid supply unit 130B. When the pressure is measured by the pressure measuring unit 100C, the fluid may be supplied from only one or both of the fluid supply units 130B and 130D. When measuring the pressure in the internal space individually, the internal space V other than the measurement target is not provided with the pressure measurement unit 100 and the fluid supply unit 130, and only the measurement is performed on the internal space V related to the measurement target. A pressure measurement unit 100 and a fluid supply unit 130 may be provided.

  Next, the operation and effect of the power storage module 12 according to this embodiment will be described. Here, the internal space VA will be described as “first internal space” in the claims. However, the other internal space V may be regarded as the “first internal space”, and in this case, the same effect and effect can be achieved.

  In this power storage module inspection method, the pressure measuring unit 100A is attached to the internal space VA. Further, the fluid supply unit 130B is attached to the internal space VB that is adjacent to the internal space VA on the one side in the stacking direction. Here, when the airtightness between the internal space VA and the internal space VB is ensured, the pressure of the internal space VA does not change even if fluid is supplied to the internal space VB. On the other hand, when the airtightness between the internal space VA and the internal space VB is not ensured, the pressure of the internal space VA also changes by supplying the fluid to the internal space VB. Therefore, by performing an inspection based on the pressure of the internal space VA measured by the pressure measurement unit 100A when the fluid is supplied from the fluid supply unit 130B to the internal space VB, the space between the internal space VA and the internal space VB is determined. Airtightness can be easily inspected. As described above, the airtightness of the power storage module 12 can be easily inspected.

  Among the plurality of internal spaces V, the pressure measuring unit 100C is attached to the internal space VC adjacent to one of the internal spaces VB in the stacking direction, and among the multiple internal spaces V, one of the internal spaces VC and the stacking direction is one. A fluid supply unit 130D that supplies fluid to the adjacent internal space VD is attached. The pressure of the internal space VA measured by the pressure measurement unit 100A when the fluid is supplied from the fluid supply unit 130B to the internal space VB and the fluid is supplied from the fluid supply unit 130D to the internal space VD, and the pressure measurement unit 100C The airtightness of the power storage module 12 may be inspected based on the measured pressure of the internal space VC. As described above, when the pressure measurement units 100 and the fluid supply units 130 are alternately provided for the plurality of internal spaces V, the internal spaces VC are the internal space VB and the internal space VD to which the fluid is supplied. It will be sandwiched from both sides in the direction. Accordingly, the fluid is supplied from the fluid supply unit 130B and the fluid supply unit 130D at the same time, and the pressure measurement unit 100C measures the pressure in the internal space VC, so that the airtightness between the internal space VB and the internal space VC, and the internal The airtightness between the space VC and the internal space VD can be checked at the same time.

  The pressure PB at which the fluid supply unit 130B supplies the fluid to the internal space VB and the pressure at which the fluid supply unit 130D supplies the fluid to the internal space VD may be different from each other. In this case, the case where the airtightness between the internal space VB and the internal space VC is not ensured, the case where the airtightness between the internal space VC and the internal space VD is not ensured, and the airtightness on both sides are The manner of changing the pressure in the internal space VC is different from the case where it is not secured. Therefore, it is possible to easily grasp which part of the airtightness is not ensured from the measurement result of the pressure measuring unit 100C.

  Note that the order of attachment of the pressure measurement unit 100 and the fluid supply unit 130 shown in FIG. 11 is merely an example, and the order may be changed as appropriate. Further, the mounting order may be changed, and a plurality of measurements may be performed on the same internal space.

  Next, with reference to FIGS. 14 to 16, an inspection method for the power storage module 12 according to another modification will be described. FIG. 14 is a flowchart showing the contents of the storage module inspection method. FIG. 15 is a conceptual diagram for explaining the contents of the inspection process shown in FIG. FIG. 16 is a diagram for explaining the detection reference value. This inspection method includes a preparation step S210 for preparing the power storage module 12, and an inspection step S250 for inspecting the airtightness of the power storage module 12. The inspection step S250 includes a measurement preparation step S220 for preparing the detection unit 200 and the detection gas supply unit 230, a detection gas supply step S230 for supplying detection gas from the detection gas supply unit 230 to the internal space V, and the detection unit 200. Determination step S240 for determining airtightness based on the detection result (see FIG. 14).

  In the preparation step S210, the power storage module 12 having an opening as described with reference to FIGS. 3 and 7 is prepared. Moreover, what attached members, such as the 1st base member 70, with respect to such opening of the electrical storage module 12 is prepared.

In the measurement preparation step S220, the detection unit 200 and the detection gas supply unit 230 are attached to each internal space V of the power storage module 12. The detection part 200 detects the detection gas which exists in the internal space V which concerns on attachment object. The detection unit 200 includes a pipe 220 that communicates with the internal space V, and a detector 210 that detects a detection gas in the internal space V via the pipe 220. The detector 210 can measure the amount of the detected gas that can be detected within a predetermined time (for example, the unit of the detected value is Pa · m ³ / sec). The detection gas supply unit 230 supplies the detection gas into the internal space V related to the attachment target. The detection gas supply unit 230 includes a pipe 240 communicating with the internal space V and a detection gas source 250 connected to the internal space V via the pipe 240. The detection gas source 250 may be constituted by a gas cylinder or the like. As the detection gas, helium, hydrogen, or the like may be employed.

  The detection unit 200 and the detection gas supply unit 230 are provided for the plurality of internal spaces V of the power storage module 12. Here, for explanation, a schematic diagram as shown in FIG. 15 is used. In FIG. 15, eight stacked units 60A, 60B, 60C, 60D, 60E, 60F, 60G, and 60H are shown. The stacked units 60A, 60B, 60C, 60D, 60E, 60F, 60G, and 60H are unit units each having one internal space VA, VB, VC, VD, VE, VF, VG, and VH. For example, after the openings 50a1 to 50a4 are sealed, the stacked units 60A, 60B, 60C, 60D, 60E, 60F, 60G, and 60H are separated without communicating with the internal space V of the other stacked units. Sex is secured independently. Each internal space V is evacuated by being evacuated. The internal spaces VA, VB, VC, VD, VE, VF, VG, and VH correspond to any one of the plurality of internal spaces V that are continuous in the stacking direction among the internal spaces V1 to V56 described above. .

  In the present embodiment, the detection units 200 and the detection gas supply units 230 are alternately and continuously attached to the plurality of internal spaces VA, VB, VC, VD, VE, VF, VG, and VH. Specifically, pipes 220A, 220C, 220E, and 220G of the detection unit 200 are attached to the internal spaces VA, VC, VE, and VG. Pipes 240B, 240D, 240F, and 240H of the detection gas supply unit 230 are connected to the internal spaces VB, VD, VF, and VH adjacent to the internal spaces VA, VC, VE, and VG in one of the stacking directions (downward in FIG. 15). It is attached. In addition, the plurality of pipes 220 of the detection unit 200 are joined on the way, and are connected to one detector 210. Further, the plurality of pipes 240 of the detection gas supply unit 230 merge in the middle and are connected to one detection gas source 250. However, a plurality of detectors 210 and detection gas sources 250 may exist.

  In the detection gas supply step S230, the detection gas supply unit 230 supplies the detection gas to the internal spaces VB, VD, VF, and VH. When detection gas supply process S230 is completed, the detection result in the detection part 200 will be acquired. The presence or absence of detection gas leakage in the internal spaces VA, VC, VE, and VG can be obtained from the detection result of the detector 210.

  In the determination step S140, the airtightness of the power storage module 12 is inspected based on the detection result of the detection gas in the internal spaces VA, VC, VE, and VG by the detection unit 200. For example, when the detection gas supply unit 230 supplies the detection gas to the internal space VB, there is a problem in any airtightness between the internal space VB and the internal space VA or between the internal space VB and the internal space VC. If there is, the detection gas leaks into either the internal space VA or the internal space VC. In this case, an amount of detection gas equal to or greater than the detection reference value is detected by the detector 210 via the pipe 220A or the pipe 220C. Therefore, when the detector 210 detects a detection gas that is equal to or higher than the detection reference value, it is determined that there is a problem in the airtightness between the internal space V and the internal space V in any one of the plurality of layers. be able to. On the other hand, when the detection gas detected by the detector 210 is smaller than the detection reference value, it can be determined that the airtightness between the internal space V and the internal space V can be secured in any layer. .

  Here, the detection reference value will be described. The detection reference value is a threshold value for determining the presence or absence of leakage by comparing with the amount of detection gas detected by the detector 210. The detection reference value of the detection gas may be set in any way as long as leakage can be detected. However, when the detection unit 200 and the detection gas supply unit 230 are alternately and continuously attached to the n-layer internal space V, a standard value (hereinafter, referred to as a criterion) which is a standard for the leakage amount per layer. ) May be set as the detection reference value. When inspecting the airtightness of one internal space V, that is, when detecting gas is supplied to one internal space V and the internal space V adjacent to the internal space V is detected, it is standardized as a criterion in advance. The converted value is adopted as a detection reference value. When there are n layers of the internal space V, there are (n−1) boundary portions (that is, portions where leakage may occur) between the adjacent internal spaces V. Therefore, the multiple multiplied by the criterion value is (n−1), which is the number of portions where leakage can occur.

  The criteria will be described in more detail with reference to FIG. In the graph shown in FIG. 16, it is assumed that the leakage amount “A1” is a criterion. When the airtightness inspection is performed on the inner space V of one layer, the detection gas leaks by a slight amount even if there is no problem in the airtightness. Further, the amount of leakage at that time is different for each power storage module 12 and for each internal space V of the power storage module 12. Accordingly, when a sufficient number of internal spaces V are inspected (inspection of only one layer) and the relationship between the amount of leakage of the detected gas detected by the detector 210 and the frequency of occurrence of the amount of leakage is plotted, A graph like FIG. 16 is drawn. As shown in FIG. 16, the occurrence frequency draws a peak having a peak at a certain amount of leakage. As the amount of leakage increases beyond the amount of leakage related to the peak, the frequency of occurrence gradually decreases, and the frequency of occurrence near the criteria further decreases.

  Here, a case where the criterion value is directly adopted as the detection reference value when the n-layer internal space V is inspected collectively will be considered. In this case, in each layer, even if the leakage amount is within a range that is not problematic for one layer, if the leakage amounts of all the layers are summed, the total value may exceed the criteria value. In this case, although there is actually no problem with the airtightness, it is determined that “there is a problem with airtightness”. For example, when a leak amount close to the criterion value occurs in only one layer of the n layers, the total leak amount of the n layer easily exceeds the criterion value. Therefore, the erroneous determination as described above can be suppressed by setting the detection reference value to a value (n-1) times the criterion. When the detection reference value is employed, erroneous determination can be suppressed even when, for example, the leakage amount of all n layers is a value close to the criteria. If there is a problem with the airtightness of the internal space V, the amount of leakage detected by the detector 210 (indicated by “A2” in FIG. 16) is not a value near the criteria, but is considerably larger than the criteria value. Value. If it is within the range of the number of layers of the internal space V normally provided in the power storage module 12, even if the detection reference value is (n-1) times the criterion, if there is a problem with airtightness, it will be detected. There is a high possibility that the leakage amount detected by the device 210 is sufficiently larger than the detection reference value. Therefore, even if the detection reference value is increased, it is possible to suppress erroneous determination such that “no problem” is determined when there is a problem with airtightness.

  As described above, in the inspection process S250, in the internal spaces VA, VC, VE, and VG detected by the detection unit 200 when the fluid is supplied from the detection gas supply unit 230 to the internal spaces VB, VD, VF, and VH. Based on the detection result of the detection gas, the airtightness of the power storage module 12 is inspected.

  In the example shown in FIG. 15, one detector 210 is provided for a plurality of internal spaces V. Therefore, the detector 210 cannot specify the internal space V from which the detection gas flows. However, when there is a location where leakage occurs even at one location, the power storage module 12 itself is an NG product, and therefore no problem occurs even if the location of the leakage cannot be specified. In addition, you may comprise so that the location of a leak can be pinpointed by using the some detector 210. FIG. In the example shown in FIG. 15, one detection gas source 250 is provided for a plurality of internal spaces V. However, a plurality of detection gas sources 250 may be provided. In this case, the timing for supplying the detection gas from the detection gas source 250 to each internal space V may be shifted. Also by such a method, it becomes possible to specify the location of leakage.

  Next, operations and effects of the power storage module 12 according to the modification will be described. Here, the internal space VA will be described as “first internal space” in the claims. However, the other internal space V may be regarded as the “first internal space”, and in this case, the same effect and effect can be achieved.

  In the method for inspecting the power storage module 12, a detection unit 200 that detects a detection gas is attached to the internal space VA. In addition, a detection gas supply unit 230 that supplies a detection gas to the internal space VB adjacent to the internal space VA in the stacking direction is attached. Here, when the airtightness between the internal space VA and the internal space VB is ensured, even if the detection gas is supplied to the internal space VB, the detection gas in the internal space VA is equal to or greater than the detection reference value. Is not detected. On the other hand, when the airtightness between the internal space VA and the internal space VB is not secured, the detection gas is supplied to the internal space VB, so that the detection gas equal to or higher than the detection reference value is detected by the detection unit 200 in the internal space VA. Is detected. Therefore, by performing an inspection based on the detection result by the detection unit 200 when the detection gas is supplied from the detection gas supply unit 230 to the internal space VB, airtightness between the internal space VA and the internal space VB can be easily achieved. Can be inspected. As described above, the airtightness of the power storage module 12 can be easily inspected.

  The detection unit 200 and the detection gas supply unit 230 may be alternately and continuously attached to the plurality of internal spaces V. As described above, when the detection units 200 and the detection gas supply units 230 are alternately and continuously provided for a plurality of internal spaces V, the detection gas is contained in one internal space V to which the detection units 200 are attached. The supplied internal space V is sandwiched from both sides in the stacking direction. Therefore, by simultaneously supplying the detection gas from the detection gas supply units 230 on both sides, the airtightness between the one internal space V to which the detection unit 200 is attached and the internal spaces V on both sides can be inspected simultaneously. .

  When the detection unit 200 and the detection gas supply unit 230 are alternately and continuously attached to the n-layer internal space V, (n-1) times the standard value that is the standard for the amount of leakage per layer. A value may be set as a detection reference value. In this case, when the airtightness inspection is simultaneously performed by the detection unit 200 and the detection gas supply unit 230 on the internal space V of the n layer, the airtightness inspection is performed with an appropriate detection reference value according to the number of layers. It can be carried out.

  DESCRIPTION OF SYMBOLS 12 ... Power storage module, 30 ... Laminated body, 30a ... Side surface, 32 ... Bipolar electrode, 34 ... Electrode plate, 34a ... Edge, 36 ... Positive electrode, 38 ... Negative electrode, 50 ... Frame, 50Aa ... First injection port, 50Ba ... second injection port, 50s ... side surface, 52 ... first resin part, 52Aa ... first opening, 52Ba ... third opening, 54 ... second resin part, 54Aa ... second opening, 54Ba ... fourth opening, DESCRIPTION OF SYMBOLS 100 ... Pressure measuring part, 130 ... Fluid supply part, 200 ... Detection part, 230 ... Detection gas supply part, V ... Internal space.

Claims (9)

A laminate in which a plurality of 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;
A frame that holds the edge of the electrode plate on the side surface of the laminate extending in the lamination direction of the bipolar electrode;
A method for inspecting a power storage module comprising:
A preparation step of preparing the power storage module;
An inspection process for inspecting the airtightness of the power storage module,
In the power storage module prepared in the preparation step,
At least a first injection port and a second injection port for injecting an electrolyte into the frame body are provided for the frame body,
The frame includes a plurality of first resin portions that hold the edge of the electrode plate, and a second resin portion that is provided around the first resin portion as viewed from the stacking direction,
The first liquid injection port has a first opening provided in any one of the plurality of first resin parts, and a second opening provided in the second resin part,
The first opening communicates with the internal space of the power storage module and the second opening,
The second injection port includes a third opening provided in the first resin portion different from the first opening among the plurality of first resin portions, and the second of the second resin portions. A fourth opening provided at a location different from the opening,
The third opening communicates with the internal space of the power storage module and the fourth opening,
Of the internal space of the power storage module, a portion communicated with the first liquid inlet and a portion communicated with the second liquid inlet are sealed,
In the inspection process,
An inspection method for a power storage module, wherein the airtightness of the power storage module is inspected based on a change in thickness of the power storage module due to a flow of fluid into the first liquid inlet and the second liquid inlet. In the inspection process,
The fluid is caused to flow into the first liquid inlet and the second liquid inlet to increase the thickness of the power storage module, and the first liquid inlet and the second liquid inlet from either one of the first liquid inlet and the second liquid inlet. The method for inspecting a power storage module according to claim 1, wherein after the fluid is discharged to reduce the thickness of the power storage module, the airtightness of the power storage module is inspected based on the thickness of the power storage module.   In the inspection step, by increasing the thickness of the power storage module by causing the fluid to flow into the first liquid inlet and the second liquid inlet, and measuring the thickness of the power storage module, the power storage The method for inspecting a power storage module according to claim 2, wherein the airtightness of the module is inspected. A laminate in which a plurality of 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;
A frame that holds the edge of the electrode plate on the side surface of the laminate extending in the lamination direction of the bipolar electrode;
A method for inspecting a power storage module comprising:
A preparation step of preparing the power storage module;
An inspection process for inspecting the airtightness of the power storage module,
In the power storage module prepared in the preparation step,
A plurality of internal spaces sealed together are formed in the bipolar electrode stacking direction,
In the inspection process,
Of the plurality of internal spaces, a first pressure measurement unit is attached to the first internal space,
Of the plurality of internal spaces, a first fluid supply unit is attached to the second internal space adjacent to the first internal space in the stacking direction,
Based on the pressure in the first internal space measured by the first pressure measurement unit when the fluid is supplied from the first fluid supply unit to the second internal space, the airtightness of the power storage module is determined. A method for inspecting a power storage module for inspecting the property Of the plurality of internal spaces, the second pressure measurement unit is attached to the second internal space and the third internal space adjacent to one another in the stacking direction,
Of the plurality of internal spaces, a second fluid supply unit is attached to the third internal space and a fourth internal space adjacent to one another in the stacking direction,
The first pressure measurement when the fluid is supplied from the first fluid supply unit to the second internal space and the fluid is supplied from the second fluid supply unit to the fourth internal space. The airtightness of the power storage module is inspected based on the pressure of the first internal space measured by the unit and the pressure of the third internal space measured by the second pressure measurement unit. 5. A method for inspecting a power storage module according to 4.   The pressure at which the first fluid supply unit supplies the fluid to the second internal space is different from the pressure at which the second fluid supply unit supplies the fluid to the fourth internal space. The method for inspecting a power storage module according to claim 5. A laminate in which a plurality of 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;
A frame that holds the edge of the electrode plate on the side surface of the laminate extending in the lamination direction of the bipolar electrode;
A method for inspecting a power storage module comprising:
A preparation step of preparing the power storage module;
An inspection process for inspecting the airtightness of the power storage module,
In the power storage module prepared in the preparation step,
A plurality of internal spaces sealed together are formed in the bipolar electrode stacking direction,
In the inspection process,
A detection unit that detects a detection gas is attached to the first internal space among the plurality of internal spaces,
A detection gas supply unit that supplies the detection gas to the second internal space adjacent to the first internal space in the stacking direction among the plurality of internal spaces is attached,
An inspection method for a power storage module, wherein the airtightness of the power storage module is inspected based on a detection result by the detection unit when the detection gas is supplied from the detection gas supply unit to the second internal space.   The storage module inspection method according to claim 7, wherein the detection unit and the detection gas supply unit are alternately and continuously attached to the plurality of internal spaces. When the detection unit and the detection gas supply unit are alternately and continuously attached to the internal space of the n layer, (n-1) times the standard value which is the standard for the leakage amount per layer. The storage module inspection method according to claim 8, wherein the value is set as a detection reference value.

Images