JP7063196B2 - How to inspect the power storage module - Google Patents

Description

The present invention relates to an inspection method for a power storage module.

As a conventional power storage module, a bipolar battery having a bipolar electrode having a positive electrode formed on one surface of an electrode plate and a negative electrode formed on the other surface is known (see, for example, Patent Document 1). The bipolar battery includes an electrode laminate formed by laminating a plurality of bipolar electrodes via a separator. The laminated body is provided with, for example, a resin-made sealing body so that the edge portion of the electrode plate is held on the side surface formed by laminating the bipolar electrodes. As a result, a plurality of internal spaces for accommodating the electrolytic solution are formed between the bipolar electrodes.

Japanese Unexamined Patent Publication No. 2011-151016

By the way, in the above-mentioned power storage module, in order to prevent the electrolytic solution from moving between adjacent internal spaces, it is necessary to ensure the sealing property of each internal space. Therefore, it is necessary to inspect the sealing property of each internal space of the power storage module.

As a method of inspecting the sealing property of the internal space, for example, a method of pressurizing or depressurizing one internal space and determining whether or not there is a change in internal pressure in another internal space adjacent to the one internal space can be mentioned. .. However, if this method is to be applied to all internal spaces, there is a problem that it takes time for inspection.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an inspection method for a power storage module capable of easily and quickly inspecting the sealing property of an internal space.

The method for inspecting a power storage module according to one aspect of the present invention surrounds an electrode laminate in which electrodes are laminated and a side surface of the electrode laminate, forms a plurality of internal spaces between adjacent electrodes, and seals the internal space. This is an inspection method for inspecting a power storage module provided with a sealing body to be stopped, and is an odd-th or even-th order counting from one end side in the stacking direction among a plurality of internal spaces arranged along the stacking direction of the electrode laminated body. The presence or absence of a change in the internal pressure is detected in the first step of changing the internal pressure of the internal space of the first set corresponding to the above and the internal space of the second set in which the internal pressure is not changed in the first step. Including the second step.

In the first step of the inspection method of the power storage module, the internal pressure of the internal space of the first set corresponding to the odd-numbered or even-numbered ones counting from one end side in the stacking direction is changed at once. Then, in the second step, the presence or absence of a change in the internal pressure is detected in the internal space of the second set in which the internal pressure is not changed in the first step. According to this method, the internal space of the first set and the internal space of the second set are alternately arranged. Therefore, if there is an abnormality in the sealing property between the adjacent internal spaces, it is abnormal. The internal pressure of the second set of internal spaces adjacent to a certain internal space will change. Therefore, in this method for inspecting the power storage module, the sealing property for all the internal spaces can be inspected by one pressure change, so that the sealing property of the internal space can be inspected easily and quickly.

In the method of inspecting the electricity storage module, the internal space of the first set may be depressurized in the first step, and in the method of inspecting the electricity storage module, when the internal space in which the internal pressure is reduced is detected in the second step, the internal space is detected. A third step of determining that there is an abnormality in the seal between the internal space and the internal space adjacent to the internal space may be further included. According to this configuration, it is possible to determine a portion where the sealing property of the internal space is not secured by the third step.

In the method of inspecting the electricity storage module, the internal space of the first set may be pressurized in the first step, and in the method of inspecting the electricity storage module, when the internal space in which the internal pressure is increased is detected in the second step, the internal space is detected. A third step of determining that there is an abnormality in the seal between the internal space and the internal space adjacent to the internal space may be further included. According to this configuration, it is possible to determine a portion where the sealing property of the internal space is not secured by the third step.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided a method for inspecting a power storage module capable of easily and quickly inspecting the sealing property of an internal space.

It is a schematic sectional drawing which shows the electric power storage apparatus which is configured with the electric power storage module which concerns on this embodiment. It is a schematic sectional drawing which shows the internal structure of a power storage module. It is a perspective view which shows the whole shape of a power storage module. It is a schematic diagram which shows the structure of the injection port provided in the sealing body. It is a flowchart which shows an example of the manufacturing process of a power storage module. It is a figure which shows roughly the structure of the inspection apparatus used in the inspection process. It is a flowchart which shows an example of an inspection process.

Hereinafter, various embodiments will be described in detail with reference to the drawings. In each drawing, the same or corresponding parts are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a schematic cross-sectional view showing an embodiment of a power storage device. The power storage device 1 shown in FIG. 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 1 includes a module stack 2 including a plurality of stacked power storage modules 4, and a restraint member 3 that applies a restraining load to the module stack 2 in the stacking direction of the module stack 2.

The module stack 2 includes a plurality of (here, three) power storage modules 4 and a plurality of (here, four) conductive plates 5. The power storage module 4 is a bipolar battery and has a rectangular shape when viewed from the stacking direction. The power storage module 4 is, for example, a secondary battery such as a nickel hydrogen secondary battery or a lithium ion secondary battery, or an electric double layer capacitor. In the following description, a nickel hydrogen secondary battery will be illustrated.

The storage modules 4 adjacent to each other in the stacking direction are electrically connected to each other via the conductive plate 5. The conductive plates 5 are arranged between the power storage modules 4 adjacent to each other in the stacking direction and outside the power storage modules 4 located at the stacking ends. A positive electrode terminal 6 is connected to one of the conductive plates 5 arranged outside the power storage module 4 located at the laminated end. The negative electrode terminal 7 is connected to the other conductive plate 5 arranged outside the power storage module 4 located at the laminated end. The positive electrode terminal 6 and the negative electrode terminal 7 are drawn out from the edge of the conductive plate 5, for example, in a direction intersecting with each other in the stacking direction. The positive electrode terminal 6 and the negative electrode terminal 7 charge and discharge the power storage device 1.

Inside the conductive plate 5, a plurality of flow paths 5a through which a refrigerant such as air flows are provided. The flow path 5a extends along a direction intersecting (orthogonal) with, for example, the stacking direction and the drawing direction of the positive electrode terminal 6 and the negative electrode terminal 7. The conductive plate 5 not only functions as a connecting member for electrically connecting the power storage modules 4 to each other, but also serves as a heat sink that dissipates heat generated by the power storage module 4 by circulating a refrigerant through these flow paths 5a. It also has a function. In the example of FIG. 1, the area of the conductive plate 5 seen from the stacking direction is smaller than the area of the power storage module 4, but from the viewpoint of improving heat dissipation, the area of the conductive plate 5 is the power storage module. It may be the same as the area of 4 and may be larger than the area of the power storage module 4.

The restraint member 3 is composed of a pair of end plates 8 that sandwich the module laminate 2 in the stacking direction, and fastening bolts 9 and nuts 10 that fasten the end plates 8 to each other. The end plate 8 is a rectangular metal plate having an area one size larger than the area of the power storage module 4 and the conductive plate 5 when viewed from the stacking direction. A film F having electrical insulation is provided on the surface of the end plate 8 on the module laminate 2 side. The film F insulates between the end plate 8 and the conductive plate 5.

An insertion hole 8a is provided at the edge of the end plate 8 at a position outside the module laminate 2. The fastening bolt 9 is passed from the insertion hole 8a of one end plate 8 toward the insertion hole 8a of the other end plate 8, and is attached to the tip portion of the fastening bolt 9 protruding from the insertion hole 8a of the other end plate 8. , The nut 10 is screwed. As a result, the power storage module 4 and the conductive plate 5 are sandwiched by the end plate 8 to be unitized as the module laminate 2, and a restraining load is applied to the module laminate 2 in the stacking direction.

Next, the configuration of the power storage module 4 will be described in detail. FIG. 2 is a schematic cross-sectional view showing the internal configuration of the power storage module shown in FIG. As shown in FIG. 2, the power storage module 4 includes an electrode laminated body 11 and a resin-made sealing body 12 that seals the electrode laminated body 11. The electrode laminate 11 is composed of a plurality of electrodes laminated along the stacking direction D of the power storage module 4 via the separator 13. These electrodes include a laminate of a plurality of bipolar electrodes 14, a negative electrode termination electrode 18, and a positive electrode termination electrode 19.

The bipolar electrode 14 has an electrode plate 15 including one surface 15a and the other surface 15b on the opposite side of the one surface 15a, a positive electrode 16 provided on the one surface 15a, and a negative electrode 17 provided on the other surface 15b. ing. The positive electrode 16 is a positive electrode active material layer formed by applying a positive electrode active material to the electrode plate 15. The negative electrode 17 is a negative electrode active material layer formed by applying a negative electrode active material to the electrode plate 15. In the electrode laminate 11, the positive electrode 16 of one bipolar electrode 14 faces the negative electrode 17 of another bipolar electrode 14 adjacent to one of the stacking directions D with the separator 13 interposed therebetween. In the electrode laminate 11, the negative electrode 17 of one bipolar electrode 14 faces the positive electrode 16 of another bipolar electrode 14 adjacent to the other in the stacking direction D with the separator 13 interposed therebetween.

The negative electrode terminal electrode 18 has an electrode plate 15 and a negative electrode 17 provided on the other surface 15b of the electrode plate 15. The negative electrode terminal electrode 18 is arranged at one end of the stacking direction D so that the other surface 15b faces the center side of the stacking direction D in the electrode laminated body 11. One surface 15a of the electrode plate 15 of the negative electrode terminal electrode 18 constitutes one outer surface in the stacking direction of the electrode laminate 11, and is electrically connected to one conductive plate 5 (see FIG. 1) adjacent to the power storage module 4. It is connected. The negative electrode 17 provided on the other surface 15b of the electrode plate 15 of the negative electrode terminal electrode 18 faces the positive electrode 16 of the bipolar electrode 14 at one end in the stacking direction D via the separator 13.

The positive electrode terminal electrode 19 has an electrode plate 15 and a positive electrode 16 provided on one surface 15a of the electrode plate 15. The positive electrode terminal electrode 19 is arranged at the other end of the stacking direction D so that one surface 15a faces the center side of the stacking direction D in the electrode laminated body 11. The positive electrode 16 provided on one surface 15a of the positive electrode terminal electrode 19 faces the negative electrode 17 of the bipolar electrode 14 at the other end in the stacking direction D via the separator 13. The other surface 15b of the electrode plate 15 of the positive electrode terminal electrode 19 constitutes the other outer surface of the electrode laminate 11 in the stacking direction, and is electrically connected to the other conductive plate 5 (see FIG. 1) adjacent to the power storage module 4. It is connected.

The electrode plate 15 is made of a metal such as nickel or a nickel-plated steel plate. As an example, the electrode plate 15 is a rectangular metal leaf made of nickel. The edge portion 15c of the electrode plate 15 has a rectangular frame shape, and is an uncoated region in which the positive electrode active material and the negative electrode active material are not coated. Examples of the positive electrode active material constituting the positive electrode 16 include nickel hydroxide. Examples of the negative electrode active material constituting the negative electrode 17 include a hydrogen storage alloy. In the present embodiment, the formation region of the negative electrode 17 on the other surface 15b of the electrode plate 15 is slightly larger than the formation region of the positive electrode 16 on the one surface 15a of the electrode plate 15.

The separator 13 is formed, for example, in the form of a sheet. Examples of the separator 13 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), a woven fabric made of polypropylene, methyl cellulose and the like, or a non-woven fabric. The separator 13 may be reinforced with a vinylidene fluoride resin compound. The separator 13 is not limited to a sheet shape, and a bag shape may be used.

The sealing body 12 is formed into a rectangular cylinder as a whole by, for example, an insulating resin. The sealing body 12 is provided on the side surface 11a of the electrode laminated body 11 so as to surround the edge portion 15c of the electrode plate 15. The sealing body 12 holds the edge portion 15c on the side surface 11a. The sealing body 12 surrounds the plurality of first sealing portions 21 coupled to the edge portion 15c of the electrode plate 15 and the first sealing portion 21 from the outside along the side surface 11a, and the first sealing portion 21. It has a second sealing portion 22 coupled to each of the above. The first sealing portion 21 and the second sealing portion 22 are, for example, alkaline-resistant insulating resins. Examples of the constituent materials of the first sealing portion 21 and the second sealing portion 22 include polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), and the like.

The first sealing portion 21 is continuously provided on one surface 15a of the electrode plate 15 over the entire circumference of the edge portion 15c, and has a rectangular frame shape when viewed from the stacking direction D. In the present embodiment, the first sealing portion 21 is provided not only on the electrode plate 15 of the bipolar electrode 14, but also on the electrode plate 15 of the negative electrode termination electrode 18 and the electrode plate 15 of the positive electrode termination electrode 19. In the negative electrode terminal electrode 18, the first sealing portion 21 is provided on the edge portion 15c of the one side surface 15a of the electrode plate 15, and in the positive electrode terminal electrode 19, both the edge portions of both the one surface 15a and the other surface 15b of the electrode plate 15 are provided. The first sealing portion 21 is provided on the 15c.

The first sealing portion 21 is welded to one surface 15a of the electrode plate 15 by, for example, ultrasonic waves or heat, and is airtightly bonded. The first sealing portion 21 is, for example, a film having a predetermined thickness in the stacking direction D. The inside of the first sealing portion 21 is located between the edge portions 15c of the electrode plates 15 adjacent to each other in the stacking direction D. The outside of the first sealing portion 21 projects outward from the edge of the electrode plate 15, and the tip portion thereof is embedded in the second sealing portion 22. The first sealing portions 21 adjacent to each other along the stacking direction D may be separated from each other or may be in contact with each other. Further, the outer edge portions of the first sealing portion 21 may be bonded to each other by, for example, hot plate welding.

The region where the electrode plate 15 and the first sealing portion 21 overlap is a coupling region K between the electrode plate 15 and the first sealing portion 21. In the coupling region K, the surface of the electrode plate 15 is roughened. The roughened region may be only the coupling region K, but in the present embodiment, the entire surface of the electrode plate 15 is roughened. Roughening can be achieved, for example, by forming a plurality of protrusions by electrolytic plating. By forming a plurality of protrusions, at the joint interface between the electrode plate 15 and the first sealing portion 21, the molten resin enters between the plurality of protrusions formed by the roughening, and the anchor effect is exhibited. To. Thereby, the bond strength between the electrode plate 15 and the first sealing portion 21 can be improved. The protrusions formed during roughening have, for example, a shape that becomes thicker from the proximal end side toward the distal end side. As a result, the cross-sectional shape between the adjacent protrusions becomes an undercut shape, and the anchor effect can be enhanced.

The second sealing portion 22 is provided on the outside of the electrode laminate 11 and the first sealing portion 21, and constitutes the outer wall (housing) of the power storage module 4. The second sealing portion 22 is formed, for example, by injection molding of a resin, and extends along the stacking direction D over the entire length of the electrode laminate 11. The second sealing portion 22 has a rectangular frame shape extending with the stacking direction D as the axial direction. The second sealing portion 22 is welded to the outer surface of the first sealing portion 21 by heat during injection molding, for example.

The first sealing portion 21 and the second sealing portion 22 form an internal space V between adjacent electrodes and seal the internal space V. More specifically, the second sealing portion 22, together with the first sealing portion 21, is between the bipolar electrodes 14 adjacent to each other along the stacking direction D, and the negative electrode termination electrodes 18 adjacent to each other along the stacking direction D. And the bipolar electrode 14, and between the positive electrode terminal 19 and the bipolar electrode 14 adjacent to each other along the stacking direction D are sealed. As a result, an airtightly partitioned internal space V is formed between the adjacent bipolar electrodes 14, the negative electrode terminating electrode 18 and the bipolar electrode 14, and the positive electrode terminating electrode 19 and the bipolar electrode 14. ing. The internal space V contains an electrolytic solution (not shown) containing an alkaline solution such as an aqueous potassium hydroxide solution. The electrolytic solution is impregnated in the separator 13, the positive electrode 16, and the negative electrode 17.

As shown in FIG. 3, the sealing body 12 of the power storage module 4 has a side surface 12a extending along the stacking direction D. The side surface 12a is provided with an injection port 50 for injecting the electrolytic solution into the internal space V. The injection port 50 is sealed with a sealing material or the like after the electrolytic solution is injected. The position of the inlet 50 may be at the center of the side surface 12a or at a position deviated from the center.

As shown in FIG. 4, the injection port 50 is composed of a first opening 50a provided in the first sealing portion 21 and a second opening 50b provided in the second sealing portion 22. A plurality of first openings 50a are provided in the first sealing portion 21 so as to communicate with each of the internal spaces V (see FIG. 2). The second opening 50b is provided alone in the second sealing portion 22 so as to communicate with the plurality of first openings 50a. In the present embodiment, the shape of the first opening 50a is circular, and the shape of the second opening 50b is rectangular.

Subsequently, the manufacturing method of the power storage module 4 described above will be described.

FIG. 5 is a flowchart showing an example of the manufacturing process of the power storage module. As shown in FIG. 5, the manufacturing process of the power storage module 4 includes a laminating process (S01), a sealed body forming process (S02), an inspection process (S03), an injection process (S04), and an assembly process (S04). S05) and is included.

In the laminating step S01, the bipolar electrodes 14 are laminated via the separator 13 to obtain a laminated body. Further, the electrode laminated body 11 is obtained by further laminating the negative electrode terminal electrode 18 and the positive electrode terminal electrode 19 on the laminated end of the laminated body of the bipolar electrode 14. In laminating, a rectangular frame-shaped first sealing portion 21 may be bonded to the edge portion 15c of each of the electrode plates 15 of the bipolar electrode 14, the negative electrode termination electrode 18, and the positive electrode termination electrode 19 by welding or the like. Suitable.

In the sealing body forming step S02, for example, a second sealing portion 22 is formed on the electrode laminated body 11 by injection molding to form the sealing body 12. Specifically, the electrode laminate 11 obtained in the laminating step is placed in the mold, and the resin material of the second sealing portion 22 having fluidity is poured into the mold to form the electrode laminate 11. A second sealing portion 22 is formed on the side surface. The first sealing portions 21 of the electrode laminate 11 are bonded to each other by the second sealing portion 22, and the sealing body 12 is obtained.

In the inspection step S03, it is inspected whether the sealing property (that is, airtightness and liquidtightness) is ensured in each internal space V by the sealing body 12 formed in the sealing body forming step S02. In the inspection step S03, the sealing property of the internal space V is improved by changing the internal pressure of the internal space V through the injection port 50 provided on the side surface 12a of the sealing body 12 by using the inspection device 60 described later. The inspection is done. The specific method of the inspection step S03 will be described later.

In the injection step S03, the electrolytic solution is injected into each of the internal spaces V of the electrode laminate 11 determined to have no abnormality in the inspection step S03. Here, the electrolytic solution is injected into the internal space V through the injection port 50 provided on the side surface 12a of the sealing body 12 by using an electrolytic solution injection device or the like. After injecting the electrolytic solution, the injection port 50 is sealed with a sealing material or the like to obtain a power storage module 4. In addition, instead of the sealing material, a pressure adjusting valve or the like may be provided in the injection port 50.

In the assembly step S05, first, a plurality of power storage modules 4 are laminated via the conductive plate 5. At this time, it is preferable that the positive electrode terminal 6 is connected in advance to the conductive plate 5 arranged on one side in the stacking direction, and the negative electrode terminal 7 is connected in advance to the conductive plate 5 arranged on the other side. Next, a pair of end plates 8 and 8 are arranged at both ends of the power storage module 4 in the stacking direction via the film F having electrical insulation. Then, the fastening bolt 9 is inserted into the insertion hole 8a of the end plate 8, and the nut 10 is screwed into the tip of the fastening bolt 9 protruding from the end plate 8. As a result, a plurality of power storage modules 4 are unitized to obtain a power storage device 1.

Subsequently, the inspection device 60 used in the above-mentioned inspection step S03 will be described. FIG. 6 is a diagram schematically showing the configuration of an inspection device used in the inspection process. As shown in FIG. 6, the inspection device 60 includes a plurality of inspection units 61 and a control unit (not shown) for controlling the plurality of inspection units 61. The inspection unit 61 is provided corresponding to the number of internal spaces V of the electrode laminate 11. In the present embodiment, the number of internal spaces V (number of cells) in the electrode laminate 11 is 24, and the number of inspection units 61 provided in the inspection device 60 is also 24. Each inspection unit 61 has a pump 62 for changing the internal pressure of the internal space V, a pressure gauge 63 for detecting a change in the internal pressure of the internal space V, and a tube 64 connecting the pump 62 and the internal space V. And have. The tube 64 is connected to the internal space V via an injection port 50 provided in the sealing body 12 of the electrode laminated body 11. The pressure gauge 63 is connected in the middle of the tube 64. The control unit is communicably connected to the inspection unit 61, and is configured to be able to individually control the pump 62 of each inspection unit 61. With such a configuration, in the inspection device 60, the internal pressure of each internal space V is individually changed by the pump 62, and the change of the internal pressure in each internal space V can be detected by the pressure gauge 63.

Next, the inspection step S03 will be described in more detail with reference to FIGS. 6 and 7. FIG. 7 is a flowchart showing an example of the inspection process.

As shown in FIG. 7, in the inspection step S03, first, the inspection device 60 is connected to the electrode laminate 11 (step S11). At this time, the tube 64 of the inspection unit 61 is inserted into the injection port 50 to connect each internal space V and each inspection unit 61. Next, among the plurality of internal spaces V arranged along the stacking direction D of the electrode laminated body 11, the first set of internal spaces V corresponding to the odd-numbered or even-numbered from one end side of the stacking direction D. The internal pressure is changed at once (first step S12). In the present embodiment, the internal space corresponding to the odd-numbered order from one end side of the stacking direction D is the internal space V1 of the first set, and the internal space corresponding to the even-numbered order is the internal space of the second set described later. The case of V2 will be described. In the first step S12, the control unit of the inspection device 60 controls only the inspection unit 61 connected to the internal space V1 of the first set, and reduces the internal pressure of the internal space V1 of the first set at one time. Next, for the second set of internal space V2 (that is, the even-numbered internal space V) in which the internal pressure was not changed (decompressed) in the first step 12, the internal pressure was used with the pressure gauge 63. (Second step S13). Next, based on the result of the second step S13, it is determined whether or not there is an abnormality in the sealing body 12 (third step S14). In the third step S14, as a result of the second step S13, when a change in the internal pressure is not detected in any of the internal spaces V2 of the second set, the sealing property of each internal space V is ensured. It is determined that there is no abnormality in the sealing body 12. As a result of the second step S13, when a decrease in the internal pressure is detected in any of the internal spaces V2 of the second set of internal spaces V2, the internal space V2 in which the decrease in the internal pressure is detected and the internal space V2. It is determined that there is an abnormality in the sealing body 12 between the one or both internal spaces V1 adjacent to the above.

As described above, in the first step S12 of the inspection method of the power storage module 4, the internal pressure of the first set of internal spaces V1 corresponding to the odd-numbered order from one end side of the stacking direction D is changed at once. Then, in the second step S13, the presence or absence of a change in the internal pressure is detected with respect to the second set of internal space V2 (internal space V corresponding to the even number) in which the internal pressure was not changed in the first step S12. In the power storage module 4, each internal space V is sealed by the sealing body 12, but due to poor welding between the plurality of first sealing portions 21 constituting the sealing body 12, the adjacent internal spaces V are sealed. Sealability may not be ensured between them. According to the above inspection method, the first set of internal spaces V1 and the second set of internal spaces V2 are alternately arranged, so that there is an abnormality in the sealing property between the adjacent internal spaces V. In this case, the internal pressure of the second set of internal spaces V2 adjacent to the abnormal internal space V will change. Therefore, in this inspection method of the power storage module 4, since the sealing property for all the internal space V can be inspected by one pressure change, the sealing property of the internal space V can be inspected easily and quickly.

Further, in the above-mentioned method for inspecting the power storage module, the internal space V1 of the first set is depressurized in the first step S12. Further, in this method of inspecting the power storage module, when the second set of internal space V2 whose internal pressure is reduced is detected in the second step S13, the second set of internal space V2 and the internal space V2 are adjacent to each other. It further includes a third step S14 for determining that there is an abnormality in the sealing body 12 between the first set of internal spaces V1 and the interior space V1. Thereby, it is possible to determine the portion where the sealing property of the internal space V is not secured by the third step S14.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made. For example, in the above embodiment, the example of depressurizing the internal space V1 of the first set in the first step S12 has been described, but the pressure is applied to the internal space V1 of the first set in the first step S12. You may. In this case, in the third step S14, when an increase in the internal pressure is detected in any of the internal spaces V2, the internal space V2 in which the increase in the internal pressure is detected and one or both internal spaces adjacent to the internal space V2 are detected. It is determined that there is an abnormality in the sealing body 12 between V1 and V1.

Further, in the above embodiment, an example will be described in which the internal pressure of the internal space V1 of the first set is changed in the first step S12, and the change of the internal pressure of the internal space V2 of the second set is detected in the second step S13. However, the internal pressure of the internal space V2 of the second set may be changed in the first step S12, and the change of the internal pressure of the internal space V1 of the first set may be detected in the second step S13.

Further, in the above embodiment, the example in which all the inspection units 61 of the inspection device 60 have the pump 62 has been described, but the internal space V (that is, the second in the above embodiment) in which the internal pressure is not changed in the first step S12 has been described. The inspection unit 61 connected to the set of internal spaces V2) may not have the pump 62.

4 ... Energy storage module, 11 ... Electrode laminate, 12 ... Sealed body, 14 ... Bipolar electrode, 60 ... Inspection device, S12 ... 1st process, S13 ... 2nd process, S14 ... 3rd process, V ... Internal space, V1 ... the internal space of the first set, V2 ... the internal space of the second set.

Claims (3)

Inspect a power storage module including an electrode laminated body in which electrodes are laminated and a sealing body that surrounds a side surface of the electrode laminated body, forms a plurality of internal spaces between adjacent electrodes, and seals the internal spaces. It ’s an inspection method,
Of the plurality of internal spaces arranged along the stacking direction of the electrode laminates, the internal pressures of the first set of internal spaces corresponding to the odd-numbered or even-numbered ones counting from one end side in the stacking direction are simultaneously applied. The first step to change and
A method for inspecting a power storage module, comprising a second step of detecting the presence or absence of a change in internal pressure with respect to the second set of internal spaces in which the internal pressure is not changed in the first step. In the first step, the internal space of the first set is depressurized.
When the internal space in which the internal pressure is reduced is detected in the second step, the third step of determining that there is an abnormality in the seal between the internal space and the internal space adjacent to the internal space is further performed. The method for inspecting a power storage module according to claim 1, including the method. In the first step, the internal space of the first set is pressurized.
When the internal space in which the internal pressure has increased is detected in the second step, the third step of determining that there is an abnormality in the seal between the internal space and the internal space adjacent to the internal space is further performed. The method for inspecting a power storage module according to claim 1, including the method.

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