JP6838509B2 - How to inspect the power storage module - Google Patents

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 Document). 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 laminated body with the frame body. The power storage module has an opening for injecting the electrolytic solution in the resin portion of the sealing material. The electrolyte is injected through the opening using a tube or nozzle.

Japanese Unexamined Patent Publication No. 2012-234823

Here, in the power storage module, an internal space is formed between the plurality of bipolar electrodes, and it is necessary to ensure the airtightness of each internal space. Therefore, there has been a demand for a method for inspecting a power storage module that can easily inspect the airtightness of such a power storage module.

One aspect of the present invention is to provide an inspection method for a power storage module capable of easily inspecting the airtightness of the power storage module.

In the method for inspecting the power storage module 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 laminated. A method for inspecting a power storage module including a laminated body and a frame body that holds an edge of an electrode plate on a side surface of the laminated body extending in the stacking direction of the bipolar electrodes, and a preparatory step for preparing the power storage module. In the power storage module prepared in the preparatory step, which includes an inspection step for inspecting the airtightness of the power storage module, a first injection port and a second injection port for injecting an electrolytic solution into the frame body are provided. A liquid injection port is provided at least, and the frame body includes a plurality of first resin portions for holding the edge portion of the electrode plate, and a second resin portion provided around the first resin portion when viewed from the stacking direction. The first liquid injection port has a first opening provided in any of the plurality of first resin portions and a second opening provided in the second resin portion, and the first liquid injection port is provided. The opening communicates with the internal space of the power storage module and the second opening, and the second injection port is provided in the first resin portion different from the first opening among the plurality of first resin portions. It has three openings and a fourth opening provided in a portion of the second resin portion different from the second opening, and the third opening communicates with the internal space of the power storage module and the fourth opening. However, in the internal space of the power storage module, the part communicating with the first injection port and the part communicating with the second injection port are sealed, and in the inspection process, the first injection is performed. 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 into the port and the second liquid injection port.

In this method of inspecting the power storage module, in the power storage module prepared in the preparation process of the power storage module, the first liquid injection port and the second liquid injection port for injecting the electrolytic solution into the frame body are provided. At least provided. Further, the first liquid injection port has a first opening provided in any one of the plurality of first resin portions and a second opening provided in the second resin portion. 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 a state of communicating with the first liquid injection port. On the other hand, the second liquid injection port is different from the third opening provided in the first resin portion different from the first opening among the plurality of first resin portions and the second opening in the second resin portion. It has a fourth opening provided at a location. The third opening communicates with the internal space of the power storage module and the fourth opening. With such a configuration, the other portion of the internal space of the power storage module that does not communicate with the first liquid injection port is in a state of communicating with the second liquid injection port. Of the internal space of the power storage module provided with such a first injection port and a second injection port, a portion communicated with the first injection port and a portion communicated with the second injection port. The space is sealed. Therefore, when the fluid flows in and out from the first liquid injection port, if there is no problem in airtightness, only the thickness of the portion of the power storage module corresponding to the first liquid injection port changes by a predetermined amount. Similarly, when the fluid flows in and out from the second injection port, only the thickness of the portion of the power storage module corresponding to the second injection port changes by a predetermined amount if there is no problem in airtightness. .. An inspection step of preparing a 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 into the first liquid injection port and the second liquid injection port. As described above, when there is no problem with airtightness, the inflow of fluid into the first injection port changes only the thickness of the portion of the power storage module corresponding to the first injection port by a predetermined amount, and the second Due to the inflow of fluid into the injection port, only the thickness of the portion of the power storage module corresponding to the second injection port changes by a predetermined amount. That is, when the relationship is not established, it can be understood that there is a problem in the airtightness of the power storage module. In this way, the airtightness can be easily inspected based on the change in the thickness of the power storage module without using a complicated device or inspection method. From the above, the airtightness of the power storage module can be easily inspected.

In the inspection process, the fluid flows into the first injection port and the second injection port to increase the thickness of the power storage module, and the fluid flows out from either the first injection port or the second injection port. 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. If there is no problem with the airtightness of the power storage module, the fluid is allowed to flow into the first injection port and the second injection port, and then the fluid is supplied from either the first injection port or the second injection port. When the fluid is discharged, only the decrease in the thickness of the portion corresponding to the liquid injection port on the outflow side is the reduction in the thickness of the power storage module. That is, when the relationship is not established, it can be understood that there is a problem in the airtightness of the power storage module.

In the inspection process, the thickness of the power storage module is increased by inflowing fluid into the first liquid injection port and the second liquid injection port, and the airtightness of the power storage module is inspected by measuring the thickness of the power storage module. You can do it. For example, when the 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 injection port and the second liquid injection port. Therefore, by measuring the thickness of the power storage module, it is possible to understand that there is a problem in the airtightness of the power storage module.

In the method for inspecting the power storage module 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 laminated. A method for inspecting a power storage module including a laminated body and a frame body that holds an edge of an electrode plate on a side surface of the laminated body extending in the stacking direction of the bipolar electrodes, and a preparatory step for preparing the power storage module. In the power storage module prepared in the preparation step, which includes an inspection step for inspecting the airtightness of the power storage module, a plurality of internal spaces sealed to each other are formed in the stacking direction of the bipolar electrodes. A first pressure measuring unit is attached to the first internal space of the plurality of internal spaces, and the second internal space of the plurality of internal spaces adjacent to the first internal space in the stacking direction. A first fluid supply unit is attached to the electrode, and 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 Based on this, the airtightness of the power storage module is inspected.

In this method of inspecting the power storage module, a first pressure measuring unit is attached to the first internal space. Further, a first fluid supply unit is attached to a second internal space 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 the 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 due to the supply of fluid to the second internal space. .. Therefore, by performing the inspection based on the pressure in the first internal space measured by the first pressure measuring unit when the fluid is supplied from the first fluid supply unit to the second internal space, the first The airtightness between the interior space and the second interior space can be easily inspected. From the above, the airtightness of the power storage module can be easily inspected.

A second pressure measuring unit is attached to a third internal space adjacent to the second internal space in the stacking direction among the plurality of internal spaces, and the third internal space among the plurality of internal spaces is provided. A second fluid supply unit that supplies fluid to the adjacent fourth internal space while in the stacking direction is attached, and the fluid is supplied from the first fluid supply unit to the second internal space, and the second The pressure in the first internal space measured by the first pressure measuring unit when the fluid is supplied from the second fluid supply unit to the fourth internal space, and the third measured by the second pressure measuring unit. The airtightness of the power storage module may be inspected based on the pressure in the internal space. In this way, when the pressure measuring unit and the fluid supply unit are alternately provided for the plurality of internal spaces, the third internal space is the second internal space and the fourth internal space to which the fluid is supplied. Therefore, it is sandwiched from both sides in the stacking direction. Therefore, the fluid is supplied from the first fluid supply unit and the second fluid supply unit at the same time, and the pressure in the third internal space is measured by the second pressure measurement unit to measure the pressure in the second internal space and the third internal space. 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 secured, and the airtightness between the third internal space and the fourth internal space is not secured. The change mode of the pressure in the third internal space is different between the case where the airtightness on both sides is not ensured and the case where the airtightness on both sides is not secured. Therefore, it is possible to easily grasp which part of the airtightness is not ensured from the measurement result of the second pressure measuring unit.

In the method for inspecting the power storage module 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 laminated. A method for inspecting a power storage module including a laminated body and a frame body that holds an edge of an electrode plate on a side surface of the laminated body extending in the stacking direction of the bipolar electrodes, and a preparatory step for preparing the power storage module. In the power storage module prepared in the preparation step, which includes an inspection step for inspecting the airtightness of the power storage module, a plurality of internal spaces sealed to each other are formed in the stacking direction of the bipolar electrodes. A detection unit that detects the detection gas is attached to the first internal space of the plurality of internal spaces, and the second interior of the plurality of internal spaces adjacent to the first internal space in the stacking direction. A detection gas supply unit that supplies the detection gas to the space is attached, and the airtightness of the power storage module is determined 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. inspect.

In this method of inspecting the power storage module, a detection unit that detects the detection gas is attached to the first internal space. Further, a detection gas supply unit for supplying 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 detected 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 is in the first internal space. Detects a detection gas that exceeds the detection reference value. Therefore, by performing the 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, the airtightness between the first internal space and the second internal space is airtight. The sex can be easily inspected. From the 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. In this way, when the detection unit and the detection gas supply unit are provided alternately and continuously with respect to the plurality of internal spaces, one internal space to which the detection unit is attached is an internal space to which the detection gas is supplied. Therefore, 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, the airtightness between the one internal space to which the detection unit is attached and the internal spaces on both sides can be inspected at the same time.

When the detection unit and the detection gas supply unit are attached alternately and continuously to the internal space of the n-layer, a value (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 of the internal space of the n-layer is simultaneously inspected by the detection unit and the detection gas supply unit, the airtightness can be inspected with an appropriate detection reference value according to the number of layers. it can.

In the present specification, "airtightness" refers to the performance of not leaking to other spaces when the gas is sealed in the internal space. Since gas leaks more easily than liquid, the state in which "airtightness" is ensured includes the state in which sealing performance against liquid is ensured. In addition, "airtightness" may be paraphrased as "sealing property".

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

It is schematic cross-sectional view which shows one Embodiment of the power storage device including the power storage module. It is schematic cross-sectional view which shows the power storage module which comprises the power storage device of FIG. It is a schematic perspective view which shows the power storage module of FIG. It is an enlarged plan view of a part of the power storage module of FIG. It is a flow chart which shows the content of the inspection method of a power storage module. It is a conceptual diagram for demonstrating the content of the inspection process shown in FIG. It is a schematic perspective view which shows the power storage module which concerns on the modification. It is an enlarged plan view of a part of the power storage module of FIG. It is an exploded perspective view of the pressure adjustment valve connected to the opening of the frame body shown in FIG. It is a schematic cross-sectional view which shows the structure of the pressure control valve shown in FIG. It is a flow chart which shows the content of the inspection method of a power storage module. It is a conceptual diagram for demonstrating the content of the inspection process shown in FIG. It is sectional drawing which shows an example of the mounting mode of the pressure measuring part. It is a flow chart which shows the content of the inspection method of a power storage module. It is a conceptual diagram for demonstrating the content of the inspection process shown in FIG. It is a figure for demonstrating the 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 duplicate description is omitted. The drawing shows the XYZ Cartesian coordinate system.

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

The plurality of power storage modules 12 can be laminated via a conductive plate 14 such as a metal plate. Seen 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 on the outside of the power storage modules 12 located 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 modules 12. As a result, the plurality of power storage modules 12 are connected in series in the stacking direction. In the stacking direction, the positive electrode terminal 24 is connected to the conductive plate 14 located at one end, and the negative electrode terminal 26 is connected to the conductive plate 14 located at the other end. The positive electrode terminal 24 may be integrated with the conductive plate 14 to be connected. The negative electrode terminal 26 may be integrated with the conductive plate 14 to be connected. The positive electrode terminal 24 and the negative electrode terminal 26 extend in a direction (X direction) intersecting the stacking direction. The positive electrode terminal 24 and the negative electrode terminal 26 can be used to charge and discharge the power storage device 10.

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

The power storage device 10 may include a restraint member 16 that restrains the power storage modules 12 and the conductive plates 14 that are alternately stacked in the stacking direction. The restraint member 16 includes a pair of restraint plates 16A and 16B and connecting members (bolts 18 and nuts 20) that connect the restraint plates 16A and 16B to each other. An insulating film 22 such as a resin film is arranged between the restraint plates 16A and 16B and the conductive plate 14. Each of the restraint plates 16A and 16B is made of a metal such as iron. When viewed from the stacking direction, the restraint plates 16A and 16B and the insulating film 22 have, for example, a rectangular shape. The insulating film 22 is larger than the conductive plate 14, and the restraint plates 16A and 16B are larger than the power storage module 12. 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 outside the power storage module 12 at the edge portion of the restraint plate 16A. Similarly, when viewed from the stacking direction, an insertion hole 16B1 through which the shaft portion of the bolt 18 is inserted is provided at a position outside the power storage module 12 at the edge portion of the restraint plate 16B. When the restraint plates 16A and 16B have a rectangular shape when viewed from the stacking direction, the insertion holes 16A1 and the insertion holes 16B1 are located at the corners of the restraint plates 16A and 16B.

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

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

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

The first resin portion 52 constituting the inner wall of the frame body 50 is provided from one surface (the 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 34a of the electrode plate 34 of each bipolar electrode 32. The adjacent first resin portions 52 are welded to each other on a surface extending outside the other surface (the surface on which the negative electrode 38 is formed) of the electrode plate 34 of each bipolar electrode 32. As a result, the edge portion 34a of the electrode plate 34 of each bipolar electrode 32 is buried and held in the first resin portion 52. Similar to the edge 34a of the electrode plate 34 of each bipolar electrode 32, the edge 34a of the electrode plate 34 arranged at both ends of the laminated body 30 is also held in a state of being embedded in the first resin portion 52. As a result, an internal space V airtightly partitioned by the electrode plates 34, 34 and the first resin portion 52 is formed between the electrode plates 34, 34 adjacent to each other in the stacking direction. The internal space V contains an electrolytic solution (not shown) composed of an alkaline solution such as an aqueous potassium hydroxide solution.

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

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

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

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

FIG. 3 is a schematic perspective view showing the power storage module of FIG. 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 50s extending in the stacking direction of the bipolar electrodes 32. The side surface 50s is a surface located on the outer side when viewed from the stacking direction of the bipolar electrodes 32. Therefore, the second resin portion 54 has the side surface 50s of the frame body 50.

The side surface 50s of the frame body 50 has a main body region 50s1 and a protruding region 50s2. The shapes of the main body region 50s1 and the protruding region 50s2 are, for example, rectangular. The main body region 50s1 is provided with a first liquid injection port 50Aa and a second liquid injection port 50Ba for injecting the electrolytic solution into the frame body 50. The injection ports 50Aa and 50Ba are sealed with a sealing material (not shown) after the electrolytic solution is injected. The shapes of the injection ports 50Aa and 50Ba are, for example, rectangular, but other shapes such as a circular shape may be used. The liquid injection ports 50Aa and 50Ba extend so that the stacking 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 seen from the stacking direction of the bipolar electrodes 32, but the positions where they are provided are not particularly limited. The main body region 50s1 has an edge E extending 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 protruding 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 with a length that extends beyond the entire length of the injection ports 50Aa and 50Ba and protrudes to both outer sides of the injection ports 50Aa and 50Ba.

As shown in FIG. 4, the first liquid injection port 50Aa includes a first opening 52Aa provided in any of the plurality of first resin portions 52 and a second opening 54Aa provided in the second resin portion 54. Can have. The first opening 52Aa communicates with the internal space of the power storage module 12 and the second opening 54Aa. The first opening 52Aa communicates with, for example, 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 may be provided at a boundary portion between adjacent first resin portions 52. May be done. The shape of each first opening 52Aa is, for example, a rectangle, and the shape of the second opening 54Aa is, for example, a rectangle. However, the shape of each opening is not particularly limited.

The second liquid injection port 50Ba has 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. The third opening 52Ba communicates with, for example, 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 that extends 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 may be provided at a boundary portion between adjacent first resin portions 52. May be done. 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.

In the internal space of the power storage module 12, the portion communicated with the first liquid injection port 50Aa and the 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 the internal spaces V (after the injection ports 50Aa and 50Ba are sealed) are independent of each other. The airtightness is ensured (see FIG. 2). Of these internal spaces V, a first opening 52Aa is formed for each of the internal spaces V corresponding to the first liquid injection port 50Aa. As a result, the internal space V corresponding to the first liquid injection port 50Aa is in a state of being communicated with each other through the first opening 52Aa and the second opening 54Aa. On the other hand, of the internal space V, a third opening 52Ba is formed for each of the internal space V corresponding to the second liquid injection port 50Ba. As a result, the internal space V corresponding to the second liquid injection port 50Ba is in a state of being communicated with each other through the third opening 52Ba and the fourth opening 54Ba. The first liquid injection port 50Aa and the second liquid injection port 50Ba are not in communication with each other and are in a sealed state. Therefore, the internal space V corresponding to the first injection port 50Aa (the portion communicating with the first injection port 50Aa) and the internal space V corresponding to the second injection port 50Ba (communication with the second injection port 50Ba). It is in a state of being sealed from each other without communicating with each other. In the present embodiment, the first opening 52Aa and the third opening 52Ba are alternately formed with respect to the plurality of first resin portions 52 laminated in the stacking direction. As a result, the internal space V corresponding to the first injection port 50Aa (the portion communicated with the first injection port 50Aa) and the internal space V corresponding to the second injection port 50Ba (to the second injection port 50Ba). The communicated portions) are alternately present in the stacking direction.

Next, the inspection method of the power storage module according to the present embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a flow chart showing the contents of the inspection method of the power storage module. 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 a state in which the first liquid injection port 50Aa and the second liquid injection port 50Ba are formed in the frame body 50 as described with reference to FIGS. 3 and 4 described above is prepared.

In the inspection step S20, the airtightness of the power storage module 12 is inspected based on the change in the thickness of the power storage module 12 due to the inflow of fluid into the first liquid injection port 50Aa and the second liquid injection port 50Ba. Further, in the inspection step S20, the power storage module 12 whose thickness is increased by allowing a fluid to flow into the first injection port 50Aa and the second injection port 50Ba, and the first injection port 50Aa and the second injection port. The airtightness of the power storage module 12 is inspected by measuring the difference in thickness between the power storage module 12 in which the fluid flows out from any one of the ports 50Ba and the thickness is reduced. That is, in the inspection step S20, the airtightness of the power storage module 12 is inspected based on the thickness of the power storage module 12 in which the fluid is sealed from only one of the first liquid injection port 50Aa and the second liquid injection port 50Ba. To do.

In order to explain the procedure of the inspection step S20, a schematic diagram as shown in FIG. 6 is shown. In FIG. 6, four laminated units 60A, 60B, 60C, 60D are shown. The laminated units 60A, 60B, 60C, and 60D are unit units each having one internal space V. After the first liquid injection port 50Aa and the second liquid injection port 50Ba are sealed, the stacking units 60A, 60B, 60C, and 60D are separated from each other without communicating with the internal space V of the other stacking units, and are airtight. Is in an independently secured state. Before sealing the first liquid injection port 50Aa, the first opening 52Aa is formed with respect to the stacking unit 60A and the stacking unit 60C. That is, the stacking unit 60A and the stacking 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 with respect to the stacking unit 60B and the stacking unit 60D. That is, the stacking unit 60B and the stacking unit 60D are communicated with the second liquid injection port 50Ba. In FIG. 6, of the laminated units 60A, 60B, 60C, and 60D, those in which gas (fluid) is sealed to increase the thickness are 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 the stacking units 60A, 60B, 60C, and 60D are not filled with gas. (See FIG. 6 (a)). In this state, the total thickness of the power storage module 12 is t0.

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

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

Next, the thickness of the power storage module 12 in a state where the gas is sealed only in a part of the laminated units is measured (step S4). The thickness of the power storage module 12 at this time is t2 (thickness t1> thickness t2> thickness t0). If there is no problem with the airtightness of the power storage module 12, the "thickness t1-thickness t2" is the thickness of the amount of gas enclosed in the stacking unit corresponding to the liquid injection port of the one released to the atmosphere. In addition, the value can be prepared in advance before the inspection. Therefore, when the actually measured thickness t2 is smaller than the prepared value, that is, when the actually measured "thickness t1-thickness t2" value is larger than the prepared value, the injection liquid released to the atmosphere It is possible to know that gas is leaking from other than the laminated unit corresponding to the mouth.

For example, if there is a problem with 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, so the actually measured "thickness t1" The value of "-thickness t2" becomes larger than the prepared value (or the thickness t2 becomes smaller than the prepared value). Alternatively, if there is a problem with the airtightness between the stacking unit corresponding to the first liquid injection port 50Aa and the stacking unit corresponding to the second liquid injection port 50Ba, the gas in the stacking 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" becomes larger than the prepared value (or the thickness t2 is prepared). It will be smaller than it was.)

Next, the gas is sealed in the injection port of the one released to the atmosphere in step S3 (step S5). As a result, all the laminated units are filled with gas again. The thickness of the power storage module 12 in this state is measured (step S6). Then, the other injection port that was not 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). In step S7 and step S8, the same processing as in step S3 and step S4 is performed except that the openings to be released to the atmosphere are different. When the process of step S8 is completed, the inspection step S20 is completed, and the inspection shown in FIG. 5 is completed. 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. Will be done.

Next, the operation and effect of the inspection method of the power storage module 12 according to the present embodiment will be described.

In the method for inspecting the power storage module 12 according to the present embodiment, in the power storage module 12 prepared in the preparation step S10 of the power storage module 12, the first unit for injecting the electrolytic solution into the frame 50 into the frame 50. At least one injection port 50Aa and a second injection port 50Ba are provided. Further, the first liquid injection port 50Aa has a first opening 52Aa provided in any one of the plurality of first resin portions 52 and a second opening 54Aa provided in the second resin portion 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 a state of communicating with the first liquid injection port 50Aa. On the other hand, the second liquid injection port 50Ba is among the third opening 52Ba provided in the first resin portion 52 different from the first opening 52Aa and the second resin portion 54 among the plurality of first resin portions 52. It has a fourth opening 54Ba provided at a position 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 portion of the internal space of the power storage module 12 that does not communicate with the first liquid injection port 50Aa is in a state of communicating with the second liquid injection port 50Ba. Of the internal space of the power storage module 12 provided with the first injection port 50Aa and the second injection port 50Ba, the portion communicating with the first injection port 50Aa and the second injection port 50Ba are communicated with each other. It is sealed between the parts. Therefore, when the fluid flows in and out from the first liquid injection port 50Aa, if 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 is a predetermined amount. Change. Similarly, when the fluid flows in and out from the second liquid injection port 50Ba, if there is no problem in airtightness, only the thickness of the portion of the power storage module 12 corresponding to the second liquid injection port 50Ba is a predetermined amount. Only change. The inspection step S20 for preparing the power storage module 12 in such a state and inspecting the airtightness of the prepared power storage module 12 is executed. In the inspection step S20, the airtightness of the power storage module 12 is inspected based on the change in the thickness of the power storage module 12 due to the inflow of fluid into the first liquid injection port 50Aa and the second liquid injection port 50Ba. As described above, when there is no problem with the airtightness, only the thickness of the portion of the power storage module 12 corresponding to the first injection port 50Aa changes by a predetermined amount due to the inflow of the fluid into the first injection port 50Aa. Due to the inflow of the fluid into the second liquid injection port 50Ba, only the thickness of the portion of the power storage module 12 corresponding to the second liquid injection port 50Ba changes by a predetermined amount. That is, when the relationship is not established, it can be grasped that there is a problem in the airtightness of the power storage module 12. As described above, the airtightness can be easily inspected based on the change in the thickness of the power storage module 12 without using a complicated device or inspection method. From the above, the airtightness of the power storage module 12 can be easily inspected.

In the inspection step S20, the fluid is allowed to flow into the first injection port 50Aa and the second injection port 50Ba to increase the thickness of the power storage module 12, and any of the first injection port 50Aa and the second injection port 50Ba. After the fluid is discharged from one of them 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. If there is no problem with the airtightness of the power storage module 12, the fluid is allowed to flow into the first injection port 50Aa and the second injection port 50Ba, and then the first injection port 50Aa and the second injection port 50Ba. When the fluid is discharged from either one, the relationship is established in which only the decrease in the thickness of the portion corresponding to the liquid injection port of the outflow side becomes the decrease in the thickness of the power storage module 12. That is, when the relationship is not established, it can be grasped that there is a problem in the airtightness of the power storage module 12.

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

For example, the configuration of the power storage device is not limited to the configurations shown in FIGS. 1 and 2. That is, as long as it has a structure capable of carrying out the manufacturing structure of the present invention, the structure may be changed as appropriate.

For example, the following inspection steps may be added to the above steps. For example, in the inspection step S20, the thickness of the power storage module 12 is increased by inflowing fluid into the first liquid injection port 50Aa and the second liquid injection port 50Ba, and the thickness of the power storage module 12 is measured. The airtightness of the power storage module 12 may be inspected. 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 injection port 50Aa and the second liquid injection port 50Ba. Therefore, by measuring the thickness of the power storage module 12, it is possible to grasp that there is a problem in the airtightness of the power storage module.

Further, the liquid injection port is not limited to two as shown in the above-described embodiment, and three or more 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 configuration of the power storage module according to the modified example will be described with reference to FIGS. 7 to 10. 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 of FIG. 7 (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 on the outer side when viewed from the stacking direction D1. Therefore, the second resin portion 54 has the side surface 50s of the frame body 50.

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

The main body region 50s1 has an edge E extending in a direction (Y direction) intersecting the stacking direction D1 of the bipolar electrodes 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 along the edge E with a length extending beyond the entire length of the opening 50a and protruding to both outer sides of the opening 50a.

As shown in FIG. 8, one opening 50a may have a first opening 52a provided in the first resin portion 52 and a second opening 54a 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 portion 52 is provided with a plurality of first openings 52a, and the second resin portion 54 is provided with a single second opening 54a extending so as to cover the plurality of first openings 52a. .. The first opening 52a may be provided in each of the first resin portions 52, or may be provided between adjacent first resin portions 52. The shape of each of the first opening 52a and the second opening 54a is, for example, a rectangle.

In the present embodiment, 56 internal spaces V are formed in the power storage module 12, and one opening 50a 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, opening 50a1 as an example), 14 first openings 52a are arranged in two rows in the lateral direction (Y direction) of the frame body 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 convenience, in order to identify the 56 internal spaces V, the internal spaces V1 are directed from the other end (lower side in the drawing of FIG. 2) to one end (upper side in the drawing of FIG. 2) of the laminated body 30. Notated as ~ V56.

For example, in the opening 50a1, the seven first openings 52a arranged in the first row (the row on the left side in the drawing of FIG. 8; the same applies hereinafter) are arranged in the internal space V1 by skipping eight steps from the other end side of the laminated body 30. , V9, V17, V25, V33, V41, V49, and the seven first openings 52a arranged in the second row (the right row in the drawing of FIG. 8; the same applies hereinafter) are laminated bodies. It is provided so as to communicate with the internal spaces V56, V48, V40, V32, V24, V16, and V8, skipping eight steps from one end side of the thirty. 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-mentioned point-symmetrical arrangement is provided. Is realized.

As for the openings 50a2 to 50a4, for example, by shifting the set of the internal spaces V to be communicated by one step with respect to the opening 50a1, a point-symmetrical arrangement can be realized as in 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, 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, 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 opening 52a as described above (that is, the association between the first opening 52a and the internal space V), it is possible to realize a configuration in which all the internal spaces V communicate with the first opening 52a which is different from each other. , The point-symmetrical arrangement as described above can be realized for all the openings 50a1 to 50a4.

FIG. 9 is an exploded perspective view of the pressure adjusting valve 160 connected to the opening 50a of the frame body 50. Further, FIG. 10 is a schematic cross-sectional view showing the configuration of the pressure regulating valve 160. Specifically, FIG. 10 shows the seven first openings 52a (first openings 52a communicating with the internal spaces V1, V9, V17, V25, V33, V41, V49) arranged in the first row of the openings 50a1. It is a cross-sectional view including a cross section. As shown in FIGS. 9 and 10, the pressure regulating 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 to 50a. 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 of (14 in this case) first communication holes 74 penetrating from the side surface 71 to the side surface 73. Each first communication hole 74 communicates with one interior space V through one corresponding first opening 52a. The first communication hole 74 includes a first communication portion 75 which is a side portion 71 side portion of the first communication hole 74 and a second communication portion 76 which is a side surface 73 side portion of the first communication hole 74.

The first communication portion 75 is formed to have a rectangular cross section. A substantially rectangular parallelepiped space S1 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 to have 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 of the first communication portion 75 connected to the second communication portion 76 is formed in a circular cross section. The inner diameter of the opening end 75b is the same as the width d1 of the opening 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 75b of the first communication portion 75 to the opening end 76a on the side surface 73 side of the second communication portion 76. The opening end 76a is formed in a circular shape. The inner diameter d3 of the opening end 76a is made 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 in which the inner diameter increases from the opening end 75b toward the opening end 76a. Such a second communication portion 76 can be formed by, for example, injection molding or the like.

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 is located at the center position of the opening end 76a rather than the center position of the opening end 75b. Extends to be located above. On the other hand, the second communication 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 76a are brought 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, for example, by hot plate welding. In the present embodiment, the second base member 80 is formed to be 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. It may be formed in a vertical shape, or it 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 (14 in this case) second communication holes 83 penetrating 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 through one corresponding first communication hole 74. The inner diameter of the opening end 83a on the first base member 70 side of the second communication hole 83 coincides with the inner diameter d3 of the opening end 76a of the first communication hole 74. The first base member 70 and the second base member 80 are joined so that the opening ends 76a and the opening ends 83a corresponding to each other when viewed 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 made 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 whose inner diameter 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. The inner diameter of the opening end 83a and the inner diameter d3 of the opening end 76a do not have to match. For example, when the inner diameter of the opening end 83a is made smaller than the inner diameter d3, an effect that allows misalignment at the time of joining can be obtained.

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

The cover member 150 is a box-shaped member having a rectangular plate-shaped bottom wall portion 101 and a side wall portion 102 erected on the edge portion of the bottom wall portion 101. The cover member 150 is formed of, for example, polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), or the like. Inside the bottom wall portion 101, a groove portion 103 recessed in a concave shape is provided for positioning the valve body 90. The cover member 150 accommodates the valve body 90 in the groove 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, with the valve body 90 positioned and accommodated in the groove 103 of the cover member 150, the end 102a of the side wall 102 is placed on the side surface 82 of the second base member 80. On the other hand, it is fixed. The method of fixing the end portion 102a and the side surface 82 is not particularly limited, and for example, laser welding, hot plate welding, fastening using a fastening member such as a bolt, or the like can be used. For example, when laser welding is used, the cover member 150 is made of a laser-transmissive resin, the second base member 80 is made of a laser-absorbing resin, and the laser is irradiated from the cover member 150 side. The boundary portion of the base member 80 with the cover member 150 can be melted and joined.

Here, the normal (uncompressed) thickness (width in the X direction) of the valve body 90 is larger than the height d5 from the bottom surface 103a of the groove 103 to the end 102a of the side wall 102. That is, the compression ratio of the valve body 90 is defined by the height d5. The compressibility 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) becomes equal to or higher than a predetermined set value. The valve body 90 is adjusted in advance so as to release the obstruction of the opening end 83b of the second communication hole 83.

A groove 84 corresponding to each opening end 83b is provided on the side surface 82 side of the second base member 80. Each groove 84 is formed in a slit shape extending in a direction (X direction and Y direction) orthogonal to the stacking direction D1. Each groove 84 is provided at a position outside the corresponding opening end 83b in a direction (Y direction) orthogonal to the stacking direction D1 and the connection direction D2. Further, the second base member 80 is provided with an exhaust port 85 for communicating the distribution space S4 with the outside. In the present embodiment, the outer open end of the exhaust port 85 is provided on the side surface 86 facing the direction orthogonal to the connection direction D2 of the second base member 80 (in the present embodiment, the Y direction as an example).

The second base member 80 is connected to a plurality of (seven in this case) groove portions 84 when viewed from the direction (X direction) facing the side surface 82, and the distribution space S4 through which the gas released from the internal space V is circulated. Is defined. The distribution space S4 is formed in a substantially rectangular parallelepiped shape. The distribution space S4 extends in the stacking direction D1 so as to connect the outer ends 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 groove portions 84 and the distribution space S4 are formed by, for example, injection molding or the like. Further, the second base member 80 is provided with an exhaust port 85 for communicating the distribution space S4 with the outside. In the present embodiment, the outer open end of the exhaust port 85 is provided on the side surface 86 facing the direction orthogonal to the connection direction D2 of the second base member 80 (in the present embodiment, the Y direction as an example). According to this configuration, the gas discharged to the one groove portion 84 in response to the increase in the pressure of the internal space V flows into the distribution space S4 commonly provided in the plurality of groove portions 84, and flows from the exhaust port 85 to the outside. Is discharged to. Therefore, the gas generated in the internal space V can be appropriately discharged to the outside by a simple configuration.

Next, the inspection method of the power storage module 12 according to the modified example will be described with reference to FIGS. 11 to 13. FIG. 11 is a flow chart showing the contents of the inspection method of the power storage module. FIG. 12 is a conceptual diagram for explaining the contents of the inspection process shown in FIG. FIG. 13 is a cross-sectional view showing an example of a mounting mode of the pressure measuring 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 measuring unit 100 and the fluid supply unit 130, a fluid supply step S130 for supplying the fluid from the fluid supply unit 130 to the internal space, and a measurement result of the pressure measuring unit 100. The determination step S140 for determining the airtightness based on the above is provided (see FIG. 11).

In the preparation step S110, the power storage module 12 in which the openings 50a1 to 50a4 are formed in the frame body 50 as described with reference to FIG. 7 is prepared with the first base member 70 attached.

In the measurement preparation step S120, the pressure measuring 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 in the internal space V related to the mounting target. The pressure measuring unit 100 includes a pipe 120 communicating with the internal space V and a pressure gauge 110 for measuring the pressure of the internal space V via the pipe 120. Specifically, the pipe 120 is attached to the open 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). The fluid supply unit 130 may be configured by, for example, attaching a pipe to the open end 76a of the first base member 70 and providing the pipe with a fluid supply mechanism such as a pump.

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

In the present embodiment, the pressure measuring 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, 100G are attached to the internal spaces VA, VC, VE, and VG. Fluid supply units 130B, 130D, 130F, 130H are attached to the internal spaces VB, VD, VF, and VH that are adjacent to the internal spaces VA, VC, VE, and VG in the stacking direction (lower in FIG. 12). .. In such a mounting mode, when the internal space VA is the "first internal space" in the claim, the internal space VB adjacent to the internal space VA in the stacking direction is the "second internal space" in the claim. Corresponds to the internal space VB and the adjacent internal space VC in the stacking direction corresponds to the "third internal space" in the claim, and the internal space VC and the adjacent internal space VD in the stacking direction are claimed. Corresponds to the "fourth interior space" in the section. Further, the pressure measuring unit 100A corresponds to the "first pressure measuring unit" in the claim, the pressure measuring unit 100C corresponds to the "second pressure measuring unit" in the claim, and the fluid supply unit 130B corresponds to the claim. Corresponding to the "first fluid supply unit", the fluid supply unit 130D corresponds to the "second fluid supply unit" in the claim. In addition, any of the internal space VC, VE, and VG may be regarded as the "first internal space" in the claims. Further, the upper part in the figure may be regarded as one side in the stacking direction. In that case, the correspondence of each component in the claim is changed as appropriate.

In the fluid supply step S130, the fluid supply units 130B, 130D, 130F, 130H supply the fluid to the internal spaces VB, VD, VF, and VH. At this time, the fluid supply units 130B, 130D, 130F, and 130H supply the fluid at the pressures PB, PD, PF, and PH, respectively. The pressures PB, PD, PF, and PH may be the same pressure or different pressures from each other. When the fluid supply step S130 is completed, the pressures of the internal spaces VA, VC, VE, and VG measured by the pressure measuring units 100A, 100, 100E, and 100G are acquired. The pressures of the internal spaces VA, VC, VE, and VG can be obtained 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 of the internal spaces VA, VC, VE, and VG measured by the pressure measuring units 100A, 100, 100E, and 100G. For example, if 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. A determination to the same effect can be made for the other internal space V.

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

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

Next, the operation / effect of the power storage module 12 according to the present embodiment will be described. Here, the internal space VA will be described as the "first internal space" in the claims. However, the other internal space V may be regarded as the "first internal space", and in that case, the same effect / effect is established.

In this method of inspecting the power storage module, 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 adjacent to the internal space VA 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 the 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 the inspection based on the pressure of the internal space VA measured by the pressure measuring unit 100A when the fluid is supplied from the fluid supply unit 130B to the internal space VB, between the internal space VA and the internal space VB. The airtightness can be easily inspected. From the above, the airtightness of the power storage module 12 can be easily inspected.

Of the plurality of internal spaces V, the pressure measuring unit 100C is attached to the adjacent internal space VC on the one side in the stacking direction with the internal space VB, and one of the plurality of internal space Vs on the one side in the stacking direction with the internal space VC. A fluid supply unit 130D that supplies fluid to adjacent internal space VDs is attached. The pressure of the internal space VA measured by the pressure measuring 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 measuring unit 100C. The airtightness of the power storage module 12 may be inspected based on the measured pressure of the internal space VC. In this way, when the pressure measuring unit 100 and the fluid supply unit 130 are alternately provided for the plurality of internal spaces V, the internal space VC is laminated in 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. Therefore, by supplying fluid from the fluid supply unit 130B and the fluid supply unit 130D at the same time and measuring the pressure of the internal space VC with the pressure measuring unit 100C, the airtightness between the internal space VB and the internal space VC and the inside The airtightness between the space VC and the interior space VD can be inspected 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 airtightness between the internal space VB and the internal space VC is not secured, the airtightness between the internal space VC and the internal space VD is not secured, and the airtightness on both sides is different. The mode of change in the pressure of the internal space VC is different from that in 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.

The mounting order of the pressure measuring unit 100 and the fluid supply unit 130 shown in FIG. 11 is only an example, and the order may be changed as appropriate. Further, the mounting order may be changed to perform a plurality of measurements for the same internal space.

Next, an inspection method of the power storage module 12 according to another modification will be described with reference to FIGS. 14 to 16. FIG. 14 is a flow chart showing the contents of the inspection method of the power storage module. 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 the detection gas from the detection gas supply unit 230 to the internal space V, and the detection unit 200. The determination step S240 for determining the airtightness based on the detection result of the above is provided (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 described above is prepared. Further, a member having a member such as the first base member 70 attached to the opening of the power 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 unit 200 detects the detection gas existing in the internal space V related to the attachment target. The detection unit 200 includes a pipe 220 that communicates with the internal space V, and a detector 210 that detects the 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, etc.). The detection gas supply unit 230 supplies the detection gas into the internal space V related to the mounting 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 configured by a gas cylinder or the like. As the detection gas, helium, hydrogen or the like may be adopted.

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

In the present embodiment, the detection unit 200 and the detection gas supply unit 230 are alternately and continuously attached to the plurality of internal spaces VA, VB, VC, VD, VE, VF, VG, and VH. Specifically, the pipes 220A, 220C, 220E, 220G of the detection unit 200 are attached to the internal spaces VA, VC, VE, VG. Piping 240B, 240D, 240F, 240H of the detection gas supply unit 230 is provided with respect to the internal spaces VB, VD, VF, and VH adjacent to the internal spaces VA, VC, VE, and VG in the stacking direction (lower in FIG. 15). It is installed. The plurality of pipes 220 of the detection unit 200 merge in the middle 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 the detection gas supply step S230 is completed, the detection result in the detection unit 200 is acquired. The presence or absence of leakage of the detection gas of the internal space VA, VC, VE, 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 of the internal space VA, VC, VE, 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 the 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 to 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 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 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 ensured in any of the layers. ..

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 the detected gas detected by the detector 210. The detection reference value of the detection gas may be set as long as the leakage can be detected. However, when the detection unit 200 and the detection gas supply unit 230 are alternately and continuously attached to the internal space V of the n-layer, a standard value (hereinafter, referred to as a criterion) which is a standard for the amount of leakage per layer. ) May be set as a detection reference value. When inspecting the airtightness of the internal space V of one layer, that is, when supplying the detection gas to the internal space V of the single layer and detecting the detection gas of the internal space V adjacent to the internal space V, the standard is specified in advance as a criterion. The converted value is adopted as the detection reference value. When there are n layers of internal space V, there are (n-1) boundary portions (that is, portions where leakage can occur) between adjacent internal space Vs. Therefore, the multiple multiplied by the value of the criteria is the number of parts where leakage can occur (n-1).

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 the criterion. When the airtightness of the inner space V of one layer is inspected, a small amount of the detected gas leaks even if there is no problem with the airtightness. Further, the amount of leakage at that time differs for each power storage module 12 and for each internal space V of the power storage module 12. Therefore, when a sufficient number of internal spaces V are inspected (inspection of only one layer) and the relationship between the leakage amount of the detected gas detected by the detector 210 and the frequency of occurrence of the leakage amount is plotted. A graph as shown in FIG. 16 is drawn. As shown in FIG. 16, the frequency of occurrence draws a peak having a peak at a certain leakage amount. As the amount of leakage increases from the amount of leakage related to the peak, the frequency of occurrence gradually decreases, and the frequency of occurrence further decreases in the vicinity of the criteria.

Here, when the internal space V of the n-layer is inspected collectively, the case where the criterion value is adopted as it is as the detection reference value is considered. In this case, even if the leakage amount of each layer is within the range where there is no problem for one layer, the total value may exceed the criterion value when the leakage amounts of all the layers are totaled. In this case, although there is actually no problem with the airtightness, it is determined that there is a problem with the airtightness. For example, if only one of the n layers has a leakage amount close to the criterion value, the total leakage amount of the n layers easily exceeds the criterion value. Therefore, by setting the detection reference value to a value (n-1) times the criterion, the above-mentioned erroneous determination can be suppressed. By adopting the detection reference value, it is possible to suppress erroneous determination even when the leakage amount of all n layers is close to the criteria, for example. 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 considerably larger than the value of the criteria. It becomes a 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 set to (n-1) times the value of the criteria, if there is a problem in airtightness even one layer, it is detected. The amount of leakage detected by the vessel 210 is likely to be sufficiently larger than the detection reference value. Therefore, even if the detection reference value is increased, when there is a problem in airtightness, it is possible to suppress an erroneous determination that "there is no problem".

As described above, in the inspection step S250, 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. The airtightness of the power storage module 12 is inspected based on the detection result of the detected gas.

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 from which internal space V the detected gas came from. However, if there is a leak even at one location, the power storage module 12 itself is an NG product, so that no problem occurs even if the leak location cannot be specified. By using a plurality of detectors 210, a leak location may be identified. Further, in the example shown in FIG. 15, one detection gas source 250 is provided for the plurality of internal spaces V, but a plurality of detection gas sources 250 may be provided. In this case, the timing of supplying the detection gas from the detection gas source 250 to each internal space V may be shifted. This method also makes it possible to identify the location of the leak.

Next, the operation / effect of the power storage module 12 according to the modified example will be described. Here, the internal space VA will be described as the "first internal space" in the claims. However, the other internal space V may be regarded as the "first internal space", and in that case, the same effect / effect is established.

In the inspection method of the power storage module 12, a detection unit 200 for detecting the detection gas is attached to the internal space VA. Further, a detection gas supply unit 230 that supplies the 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 is equal to or higher than the detection reference value in the detection unit 200 in the internal space VA. Is not detected. On the other hand, when the airtightness between the internal space VA and the internal space VB is not ensured, the detection gas is supplied to the internal space VB, and 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 the 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, the airtightness between the internal space VA and the internal space VB can be easily improved. Can be inspected. From the 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. In this way, when the detection unit 200 and the detection gas supply unit 230 are provided alternately and continuously with respect to the plurality of internal spaces V, the detection gas is contained in one internal space V to which the detection unit 200 is 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 space V on both sides can be inspected at the same time. ..

When the detection unit 200 and the detection gas supply unit 230 are attached alternately and continuously to the internal space V of the n-layer, it is (n-1) times the standard value of the leakage amount per layer. The value may be set as the detection reference value. In this case, when the detection unit 200 and the detection gas supply unit 230 simultaneously perform the airtightness inspection 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.

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 body, 50Aa ... First liquid injection port, 50Ba ... 2nd injection port, 50s ... side surface, 52 ... 1st resin part, 52Aa ... 1st opening, 52Ba ... 3rd opening, 54 ... 2nd resin part, 54Aa ... 2nd opening, 54Ba ... 4th opening, 100 ... pressure measuring unit, 130 ... fluid supply unit, 200 ... detection unit, 230 ... detection gas supply unit, 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 body that holds the edge of the electrode plate on the side surface of the laminated body extending in the stacking direction of the bipolar electrodes, and
It is an inspection method of the power storage module equipped with
The preparatory process for preparing the power storage module and
It is provided with an inspection process for inspecting the airtightness of the power storage module.
In the power storage module prepared in the preparation step,
The frame body is provided with at least a first liquid injection port and a second liquid injection port for injecting an electrolytic solution into the frame body.
The frame body includes a plurality of first resin portions for holding the edge portion of the electrode plate, and a second resin portion provided around the first resin portion when viewed from the stacking direction.
The first liquid injection port has a first opening provided in any of the plurality of first resin portions and a second opening provided in the second resin portion.
The first opening communicates with the internal space of the power storage module and the second opening.
The second liquid injection port is 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. It has a fourth opening provided at a location different from the opening, and has.
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, the first internal space communicated with the first liquid injection port and the second internal space communicated with the second liquid injection port are partitioned.
In the inspection process,
A fluid is allowed to flow into the first internal space and the second internal space.
The fluid is allowed to flow out from the internal space of either the first internal space or the second internal space to be released to the atmosphere.
The first thickness of the power storage module in a state where the one internal space is open to the atmosphere and the fluid flows into the other internal space is measured.
A method for inspecting a power storage module, which inspects the airtightness of the power storage module by comparing the measured value based on the first thickness with a reference value prepared in advance. In the inspection process,
The second thickness of the power storage module in a state where the fluid has flowed into the first internal space and the second internal space is measured.
As a value based on the first thickness, a value of decrease from the measured second thickness to the measured first thickness is calculated.
The method for inspecting a power storage module according to claim 1, wherein the calculated reduction value is compared with the reference value prepared in advance for the reduction value to check the airtightness of the power storage module. In the inspection process,
The second thickness of the power storage module in a state where the fluid has flowed into the first internal space and the second internal space is measured.
The power storage module according to claim 1 or 2, wherein the measured second thickness is compared with a reference value prepared in advance for the second thickness to inspect the airtightness of the power storage module. Inspection method. 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 body that holds the edge of the electrode plate on the side surface of the laminated body extending in the stacking direction of the bipolar electrodes, and
It is an inspection method of the power storage module equipped with
The preparatory process for preparing the power storage module and
It is provided with 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 partitioned from each other are formed in the stacking direction of the bipolar electrodes.
In the inspection process,
A first pressure measuring unit is attached to the first internal space among the plurality of internal spaces.
Among the plurality of internal spaces, a first fluid supply unit is attached to a second internal space adjacent to the first internal space on the one side in the stacking direction.
Based on the pressure of the second of the first of said flow body is measured by the first pressure measuring portion when supplied first internal space into the inner space from the first fluid supply unit, the power storage A method of inspecting a power storage module that inspects the airtightness of a module. A second pressure measuring unit is attached to a third internal space that is adjacent to the second internal space in the stacking direction among the plurality of internal spaces.
A second fluid supply unit is attached to the third internal space and the fourth internal space adjacent to each other in the stacking direction among the plurality of internal spaces.
Wherein when said first feeding said first fluid to said second internal space from the fluid supply unit, and was fed a second fluid into the fourth internal space from the second fluid supply portion The airtightness of the power storage module is determined based on the pressure in the first internal space measured by the first pressure measuring unit and the pressure in the third internal space measured by the second pressure measuring unit. The method for inspecting a power storage module according to claim 4, wherein the inspection method is performed. The pressure at which the first fluid supply unit supplies the first fluid to the second internal space and the pressure at which the second fluid supply unit supplies the second fluid to the fourth internal space. The method for inspecting a power storage module according to claim 5, which is different from each other. 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 body that holds the edge of the electrode plate on the side surface of the laminated body extending in the stacking direction of the bipolar electrodes, and
It is an inspection method of the power storage module equipped with
The preparatory process for preparing the power storage module and
It is provided with 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 partitioned from each other are formed in the stacking direction of the bipolar electrodes.
In the inspection process,
A detection unit that detects the detection gas is attached to the first internal space among the plurality of internal spaces.
Among the plurality of internal spaces, a detection gas supply unit that supplies the detection gas to the first internal space and the second internal space adjacent to the first internal space in the stacking direction is attached.
A method for inspecting a power storage module, which inspects the airtightness of the power storage module 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. The method for inspecting a power storage module 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, it is (n-1) times the standard value which is the standard of the leakage amount per layer. The method for inspecting a power storage module according to claim 8, wherein a value is set as a detection reference value.

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