JP2011249428A - Power storage module with explosion proof function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage module with an explosion proof function, which ensures to avoid the explosion of a container of a power storage device without increasing the size of the module.SOLUTION: In the power storage module 10, a plurality of power storage cells 11 are stacked with main surfaces 11a and 11b overlapped. Stack plates 12 are respectively disposed between adjacent power storage cells 11. A cutting blade 61, which contacts with an outer edge 46a of a container 46 expanded due to the increase of inner pressure and cleaves the container 46, is provided in each stack plate 12. The cutting blade 61 is a metal member and is fixed to the stack plate 12 made of resin material.

Description

  The present invention is a module in which storage cells formed by sealing and sealing an electrode laminate in a metal laminate film container are electrically connected in series or in parallel, and has an explosion-proof function having a function of preventing the container from bursting It is related with a storage battery module.

  Energy storage systems such as load leveling devices such as photovoltaic power generation and wind power generation, instantaneous voltage drop countermeasure devices for electronic devices such as computers, and energy regeneration devices for electric vehicles and hybrid cars have a large energy capacity. There is a need for an electricity storage device that can be rapidly charged and discharged. Conventional lead-acid batteries and other secondary batteries are difficult to charge and discharge with a large current and have a short cycle life, so it is difficult to cope with the power storage system. Accordingly, in recent years, non-aqueous power storage devices have attracted attention as new power storage devices that can solve these problems.

  Currently, a lithium ion capacitor has been proposed as an electricity storage device capable of rapid charge / discharge and long life. This lithium ion capacitor includes an electrode laminate formed by laminating a positive electrode and a negative electrode. Such an electrode laminate is accommodated in a laminate case made of, for example, a soft aluminum laminate foil, and the case is filled with an organic electrolyte containing lithium ions. In this lithium ion capacitor, when gas is generated in the laminate case at the time of abnormality such as overcharge, the internal pressure of the laminate case increases and the case expands. Conventionally, in order to prevent the laminate case from bursting in the event of an abnormality, a technique for safely and reliably discharging the gas in the laminate case has been proposed (see, for example, Patent Document 1).

  In the power storage module (device assembly) disclosed in Patent Document 1, the power storage devices are stacked in a separated state. And the gas discharge hole formation member which has a needle-like projection part is provided in the state spaced apart from the position of the central part where the laminate case of an electrical storage device swells most. In this power storage module, when gas is generated in the power storage device and the laminate case expands, needle-like protrusions are pierced into the laminate case to form a gas discharge hole, and gas is discharged from the gas discharge hole. By discharging, the burst of the laminate case is avoided.

JP 2010-33789 A

  By the way, in the above-described conventional power storage module, the power storage devices are separated and stacked, and a gas discharge hole forming member is installed in a space formed between the power storage devices. Thus, when the installation space for the gas discharge hole forming member is provided between the electricity storage devices, the size of the electricity storage module is increased. In this case, the energy density of the entire power storage module is reduced. Furthermore, in a device in which the power storage module is mounted, a sufficient installation space for the power storage module must be secured, which makes it difficult to reduce the size of the device.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an energy storage module with an explosion-proof function that can reliably avoid the rupture of the container of the energy storage device without increasing the module size. There is.

  Means [1] to [6] for solving the above problems are listed below.

  [1] An electrode laminate formed by laminating a positive electrode and a negative electrode is hermetically sealed in a container made of a metal laminate film together with an electrolytic solution, and external terminals respectively connected to the positive electrode and the negative electrode are connected to the container. A plurality of power storage cells protruding and exposed, and a frame-shaped stack member interposed between the power storage cells stacked in a state where the cell main surfaces are overlapped with each other, and the plurality of power storage cells Is a storage module electrically connected in series or in parallel, wherein the stack member is provided with a cutting blade that contacts the outer edge portion of the container expanded due to an increase in internal pressure to cleave the container. Storage module with explosion-proof function.

  Therefore, according to the invention described in Means 1, since the plurality of power storage cells are stacked in a state where the cell main surfaces are overlapped with each other, there is no gap between the power storage cells as in the prior art, and the power storage module Can be configured compactly. Further, in the power storage module, when an abnormality such as overcharge or overdischarge occurs, gas is generated in the container of the power storage cell and the internal pressure rises. In this case, since each electrical storage cell is arrange | positioned in the state which accumulated cell main surfaces, the outer edge part of a container expand | swells. At this time, the cutting blade provided on the stack member comes into contact with the outer edge portion of the expanded container to cleave the container. As a result, gas is discharged from the hole opened in the container, the internal pressure of the container can be reliably released, and the container can be prevented from bursting.

  [2] The electricity storage module with an explosion-proof function according to means 1, wherein the cutting blade is a metal member and is fixed to the stack member made of a resin material.

  According to the invention described in Means 2, since the cutting blade is a metal member, the blade portion can be formed so as to have a strong and sharp edge shape. For this reason, the container can be reliably cleaved. The metal cutting blade is preferably fixed to the resin stack member by heat welding. In this case, the cutting blade can be fixed to the stack member easily and reliably. In addition, you may fix so that a metal cutting blade may be inserted in the resin-made stack members.

  [3] In the means 2, the cutting blade is formed so that a plate-like member having blade portions at two places is folded in two, and the two blade portions face each of two adjacent storage cells. An energy storage module with an explosion-proof function.

  Therefore, according to the invention described in the means 3, it is possible to efficiently cleave the containers of the two storage cells adjacent to each other by the two blade portions formed on the cutting blade. Moreover, since the number of parts can be reduced compared with the case where a cutting blade is provided for each power storage cell, the part cost of the power storage module can be suppressed.

  [4] The storage module with explosion-proof function according to means 1, wherein the cutting blade is formed integrally with the stack member made of a resin material.

  According to the invention described in the means 4, since the cutting blade is integrally formed on the stack member made of a resin material, the number of parts is reduced as compared with the case where the stack member and the cutting blade are configured as separate members. can do. As a result, the component cost of the power storage module can be suppressed.

  [5] In any one of the means 1 to 4, the positive external terminal and the negative external terminal protrude in opposite directions, and the positive edge external terminal protrudes from the cutting blade. A storage module with an explosion-proof function, wherein the storage module is provided corresponding to an outer edge portion on the side and an outer edge portion on the side from which the external terminal of the negative electrode projects.

  In the electricity storage device of the invention described in means 5, the positive external terminal and the negative external terminal are provided so as to protrude in opposite directions. In the container of this electricity storage device, when the internal pressure rises, either the outer edge portion on the side where the positive external terminal protrudes or the outer edge portion on the side where the negative external terminal protrudes may swell first. In this invention, since the cutting blade is provided corresponding to these outer edge parts, the outer edge part of a container can be rapidly cleaved by any one cutting blade.

  [6] The electricity storage module with an explosion-proof function according to any one of the means 1 to 4, wherein the cutting edge has a tip-like edge shape pointed in a triangular mountain shape.

  According to the invention described in the means 6, since the cutting blade has a pointed edge shape with a triangular mountain shape, a relatively large hole can be formed in the container, and the gas generated in the container can be reliably Can be discharged.

  As described above in detail, according to the inventions described in the means 1 to 6, the container of the electricity storage device can be surely avoided without increasing the module size.

Sectional drawing which shows schematic structure of the electrical storage module of one embodiment. The top view which shows an electrical storage cell. Sectional drawing which shows an electrical storage cell. The top view which shows a stack plate. The side view which shows a stack plate. (A) is a front view of a cutting blade, (b) is a plan view of the cutting blade, (c) is a side view of the cutting blade. The top view of the plate-shaped member for forming a cutting blade. Explanatory drawing which shows the container expanded and deformed in the electrical storage module. The top view which shows the cutting blade of a comparative example. The top view which shows the hole formed in a container with the cutting blade of FIG. The top view which shows the hole formed in a container by the cutting blade of FIG. Sectional drawing which shows schematic structure of the electrical storage module of another embodiment. Sectional drawing which shows schematic structure of the electrical storage module of another embodiment.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a schematic configuration of a power storage module according to the present embodiment. 2 is a plan view of a power storage cell constituting the power storage module, and FIG. 3 is a cross-sectional view of the power storage cell.

  As shown in FIG. 1, a power storage module 10 of the present embodiment is a module in which a plurality of (for example, 12) storage cells 11 of a lithium ion capacitor are stacked, and a stack plate 12 is interposed between the storage cells 11. (Stack member) is interposed.

  As shown in FIGS. 2 and 3, the storage cell 11 of the present embodiment includes an electrode stack 45 formed by stacking a positive electrode 21, a negative electrode 31, and a separator 41. In this electrode laminate 45, a plurality of units of power generation elements are stacked with a power generation element formed by arranging the positive electrode 21 and the negative electrode 31 facing each other with a separator 41 therebetween as one unit.

  The positive electrode 21 has a structure in which a positive electrode 22 made of a material capable of reversibly supporting lithium ions is formed on a positive electrode current collector 23. The positive electrode current collector 23 is a member for collecting current while supporting the positive electrode 22, and is formed using a conductive metal plate made of, for example, aluminum. The positive electrode current collector 23 is formed in a rectangular shape in plan view, and a tab 24 projects from one of the four sides. The tab 24 is connected to a positive external terminal 25 made of aluminum.

  The negative electrode 31 has a structure in which a negative electrode 32 made of a material capable of reversibly supporting lithium ions is formed on a negative electrode current collector 33. The negative electrode current collector 33 is a member for collecting current while supporting the negative electrode 32, and is formed using a conductive metal plate made of copper, for example. The negative electrode current collector 33 is formed in a rectangular shape in plan view, and a tab 34 projects from one of the four sides. The tab 34 is connected to a negative external terminal 35 made of copper.

  In the electricity storage cell 11 of the present embodiment, the electrode laminate 45 is hermetically sealed in the container 46 together with the electrolytic solution containing a lithium salt. This container 46 is a soft container processed into a rectangular bag shape using an aluminum laminate film (metal laminate film) obtained by laminating an aluminum foil on a resin film. The opening is sealed by heat sealing. Sealing by thermal fusion is performed in a state where the positive external terminal 25 and the negative external terminal 35 are sandwiched between the fusion parts.

  When the electrode stack 45 is housed in the container 46 in this way, the positive electrode external terminal 25 protrudes from one end (the right end in FIG. 3) of the container 46 and the other end in the opposite direction. The negative external terminal 35 protrudes from the left end in FIG. In addition, you may form the container 46 using the metal laminated film which consists of metal foil other than aluminum foil.

  In the power storage module 10 of the present embodiment, a stack plate 12 is interposed between the power storage cells 11, and the cell main surfaces (the upper surface 11a and the lower surface 11b in FIG. 1) of the power storage cells 11 are stacked. Each storage cell 11 is modularized by arranging. And about each storage cell 11 arrange | positioned up and down, by welding the positive electrode external terminal 25 of one electrical storage cell 11 and the negative electrode external terminal 35 of the other electrical storage cell 11, each electrical storage cell 11 is electrically connected in series. It is connected. In addition, the electrical storage module 10 is good also as a module of the structure which welded the external terminals of the same polarity and connected each electrical storage cell 11 in parallel.

  As shown in FIGS. 1, 4 and 5, the stack plate 12 is a rectangular frame-shaped member, and is formed using, for example, flame-retardant polypropylene or glass-filled nylon which is a flame-retardant resin material. ing. More specifically, the stack plate 12 includes a flat plate portion 52 having an opening 51 at the center, and an outer frame portion 53 provided so as to surround the outer periphery of the flat plate portion 52. The storage portion of the electrode stack 45 in the container 46 is disposed at a position inside the opening 51. The flat plate portion 52 is provided so as to be connected to the substantially central portion of the inner surface of the outer frame portion 53, and the cross-sectional shape of the connecting portion is substantially T-shaped. Moreover, in this Embodiment, the metal plate 55 (for example, aluminum plate) is arrange | positioned so that the opening 51 may be plugged up in the flat plate part 52 (refer FIG. 1). The metal plate 55 is interposed between the power storage cells 11 so as to be in surface contact with the cell main surfaces 11 a and 11 b of the adjacent power storage cells 11, and functions as a heat dissipation plate that radiates heat generated in each power storage cell 11. .

  As shown in FIGS. 4 and 5, positioning protrusions 57 that are engaged with the other stack plate 12 and positioned relative to each other inside the corner portion that is diagonal in the outer frame portion 53 of the stack plate 12. , 58 are provided. The positioning protrusions 57 and 58 are provided so as to protrude above the stack plate 12, and the stack plates 12 are positioned with each other by engaging with the inner surface of the outer frame portion 53 of the stack plate 12 disposed above. Yes.

  Further, a cutting edge 61 is provided at the opening edge of the flat plate portion 52 in the stack plate 12. In the present embodiment, the cutting blades 61 are not provided on all the stack plates 12, but the cutting blades 61 are provided on every other stack plate 12. Specifically, in the flat plate portion 52 of the stack plate 12, it is an opening edge corresponding to one of the external terminals 25 and 35 (left side in FIG. A cutting blade 61 is arranged. As shown in FIG. 6, the cutting blade 61 is a metal member having a substantially Y shape, and a plate-like member 63 (see FIG. 7) having blade portions 62 at two locations is bent in two. Is formed. Each blade part 62 which becomes the front-end | tip of the cutting blade 61 has the shape of a blade-pointed blade edge sharpened in the triangular mountain shape. In the cutting edge 61, a circular fixing hole 65 is provided on the base end side serving as a fixing portion.

  A circular projection 66 is provided on the flat plate portion 52 of the stack plate 12, and the cutting blade 61 is fixed by thermal welding in a state where the fixing hole 65 of the cutting blade 61 is fitted into the projection 66. Here, the fixing method of the cutting blade 61 is not limited to the heat welding, and the cutting blade 61 may be fixed only by fitting when sufficient fixing strength is obtained. Further, in the flat plate portion 52, a through hole 67 through which the blade portion 62 is inserted is formed between the projection 66 that fixes the cutting blade 61 and the opening 51. Further, each blade portion 62 in the cutting blade 61 is inclined in the center direction of the stack plate 12 with reference to a direction orthogonal to the flat plate portion 52 of the stack plate 12 (the stacking direction of the stack plate 12 in the vertical direction in FIG. 1). is doing. In the present embodiment, the inclination angle of the blade portion 62 with respect to the flat plate portion 52 is about 55 °.

  As described above, in the power storage module 10 according to the present embodiment, the cutting blade 61 is disposed so that the two blade portions 62 face each of the two adjacent power storage cells 11. Further, the cutting blade 61 is arranged so that the tip of the blade portion 62 is retracted from the opening edge, and the blade portion 62 of the container 46 is in a normal state when no gas is generated in the storage cell 11. Separated from the surface.

  When gas is generated in the container 46 at the time of abnormality such as overcharge or overdischarge, the internal pressure rises and the container 46 expands. At this time, since the cell main surfaces 11a and 11b overlap each other in the electricity storage cell 11, the outer edge portion 46a of the container 46 expands as shown in FIG. Then, the blade portion 62 provided at the tip of the cutting blade 61 abuts the surface of the container 46 which has been expanded and deformed substantially at a right angle, thereby causing the container 46 to be cleaved. As a result, the gas generated in the container 46 is discharged to the outside, and the internal pressure of the container 46 is released.

  Incidentally, when using a cutting blade 71 (see FIG. 9) formed in a single cutting process like the cutting edge shape of a cutter knife, a relatively small hole 72 is formed in the container 46 as shown in FIG. It is formed. In this case, there is a possibility that the gas generated in the container 46 is not sufficiently released and the container 46 is ruptured. On the other hand, the cutting blade 61 (refer FIG. 6) of this Embodiment is formed so that it may become a blade-shaped blade-tip shape in a two-step cutting process. For this reason, as shown in FIG. 11, the container 46 is formed with a wide and relatively large hole 72, and the gas generated in the container 46 is efficiently discharged.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) In the power storage module 10 of the present embodiment, since a plurality of power storage cells 11 are stacked in a state where the cell main surfaces 11a and 11b are overlapped with each other, There is no gap and the power storage module 10 can be configured compactly. Further, in this case, each storage cell 11 is stored between the stack plates 12 in a state where the electrode stack 45 is pressurized, so that the electrodes of the positive electrode 21 and the negative electrode 31 can be held at an appropriate interval. The power storage performance of the power storage cell 11 can be sufficiently secured. In addition, when gas is generated in the container 46 of the storage cell 11 and the container 46 expands in the event of an abnormality such as overcharge or overdischarge, the cutting blade 61 provided on the stack plate 12 is moved to the expanded container 46. The container 46 is cleaved in contact with the outer edge portion 46a. As a result, the gas is discharged from the hole 72 opened in the container 46, the internal pressure of the container 46 can be reliably released, and the rupture of the container 46 can be reliably avoided.

  (2) In the present embodiment, the cutting blade 61 is a metal member, and since the blade portion 62 can be formed so as to have a strong and sharp blade shape, the container 46 can be reliably cleaved. Can do. A metal cutting blade 61 is fixed to the resin stack plate 12 by heat welding. More specifically, a fixing hole 65 is formed on the base end side of the cutting blade 61, and the base end of the cutting blade 61 is fixed by thermal welding in a state where the fixing hole 65 is fitted in the protrusion 66 provided on the stack plate 12. Is done. In this way, the metal cutting edge 61 can be easily and reliably fixed to the resin stack plate 12.

  (3) In the present embodiment, the cutting blade 61 bends the plate-like member 63 having the blade portions 62 at two places in two, and the two blade portions 62 face each of the two adjacent storage cells 11. It is formed as follows. If it does in this way, the container 46 of the two adjacent electrical storage cells 11 can be efficiently and reliably cleaved by one cutting edge 61. Moreover, since the number of parts can be reduced compared with the case where a cutting blade is provided for each power storage cell 11, the part cost of the power storage module 10 can be suppressed.

  (4) In the present embodiment, the cutting edge 61 has a pointed edge shape that is pointed in a triangular mountain shape, so that a relatively large hole 72 can be formed in the container 46 and is generated in the container 46. Gas can be discharged reliably.

  (5) In the present embodiment, the leading edge of the cutting edge 61 is disposed so as to be retracted from the opening edge of the stack plate 12. In this case, it is possible to prevent the cutting edge 61 from hitting the container 46 when the container 46 is not expanded.

  (6) In the present embodiment, the cutting blade 61 is arranged in a state where the blade portion 62 is inclined in the central direction of the stack plate 12 with respect to the stacking direction of the stack plate 12. In this case, the blade portion 62 can be brought into contact with the outer edge portion 46a of the container 46 that has been inflated and deformed at the time of abnormality, so that the container 46 can be reliably cleaved.

  In addition, you may change embodiment of this invention as follows.

  -In the electrical storage module 10 of the said embodiment, although the cutting blade 61 was provided corresponding to one outer edge part 46a from which the external terminals 25 and 35 protruded in the container 46, it is not limited to this Absent. As in the electricity storage module 10A shown in FIG. 12, the cutting blades respectively correspond to the outer edge portion 46a on the side where the positive electrode external terminal 25 protrudes and the outer edge portion 46a on the side where the negative electrode external terminal 35 protrudes. 61 may be provided. In this case, even if one of the outer edge portion 46a on the side from which the positive electrode external terminal 25 protrudes and the outer edge portion 46a on the side from which the negative electrode external terminal 35 protrudes in the container 46, the bulge does not occur. The outer edge portion 46a abuts on the cutting edge 61, and the container 46 can be quickly cleaved. Further, in the power storage module 10 of the above embodiment, the cutting blades 61 are provided on every other stack plate 12, but the cutting blades 61 may be provided on all the stack plates 12. Even in this case, the container 46 expanded by the increase in internal pressure can be reliably cleaved.

  -In the electrical storage cell 11 of the said embodiment, although the positive electrode external terminal 25 and the negative electrode external terminal 35 were pulled out in the mutually opposite direction, it is not limited to this, The positive electrode external terminal 25 and the negative electrode external terminal from the same direction It is good also as a structure which pulls out 35. In this case, the container 46 may be provided with a cutting edge 61 corresponding to the outer edge portion 46a on the side where the external terminals 25 and 35 are provided, or on the side where the external terminals 25 and 35 are provided. The cutting edge 61 may be provided corresponding to the outer edge portion 46a on the opposite side (the side where the external terminals 25 and 35 are not provided). Of course, corresponding to the outer edge portion 46a on the side where the external terminals 25 and 35 are provided and the outer edge portion 46a on the opposite side, the cutting blades 61 are provided at positions corresponding to the two opposite sides of the stack plate 12, respectively. Also good. Even in this case, the container 46 expanded by the increase in internal pressure can be reliably cleaved.

  -In above-mentioned embodiment, although the cutting blade 61 was comprised with the metal members, you may comprise using a ceramic member, a resin member, etc. besides this. Further, like the power storage module 10B shown in FIG. 13, the cutting blade 61A may be integrally formed on the stack plate 12A made of a resin material. If it does in this way, compared with the case where the stack plate 12 and the cutting blade 61 are comprised by another member, since the number of parts can be reduced, the component cost of the electrical storage module 10B can be held down.

  In the above-described embodiment, the storage cell 11 of the lithium ion capacitor is embodied, but the present invention can be embodied in another electrical storage device as long as the container 46 made of a metal laminate film is provided. For example, the present invention may be embodied in an electric double layer capacitor or a lithium ion secondary battery.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the embodiment described above are listed below.

  (1) The storage module with an explosion-proof function according to any one of the means 1 to 6, wherein the cutting blade is provided on each of two opposing sides of the stack member.

  (2) The storage module with explosion-proof function according to any one of the means 1 to 6, wherein the cutting blade is provided at an opening edge of the stack member.

  (3) In any of the means 1 to 6, the tip of the cutting blade is disposed so as to be retracted from the opening edge of the stack member. .

  (4) The power storage module with an explosion-proof function according to any one of the means 1 to 6, wherein the blade portion of the cutting blade is disposed in a state of being separated from the surface of the container in a normal state.

  (5) In any one of the means 1 to 6, the cutting blade is disposed in a state in which the blade portion is inclined in the center direction of the stack member with respect to the stacking direction of the stack member. Power storage module with functions.

  (6) In the means 2, a fixing hole is provided on the base end side of the cutting blade, and the cutting blade is fixed by thermal welding in a state where the fixing hole is fitted in a protrusion provided on the stack member. An energy storage module with an explosion-proof function.

  (7) The power storage module with an explosion-proof function, characterized in that, in the means 3, the cutting blade has a substantially Y shape.

  (8) The explosion-proof function according to any one of the means 1 to 6, wherein the stack member has a positioning protrusion that is engaged with another adjacent stack member at the time of stacking and arranged for mutual positioning. With storage module.

DESCRIPTION OF SYMBOLS 10, 10A, 10B ... Power storage module 11 ... Power storage cell 11a, 11b ... Cell main surface 12, 12A ... Stack plate as stack member 21 ... Positive electrode 25 ... Positive electrode external terminal 31 ... Negative electrode 35 ... Negative electrode external terminal 45 ... Electrode laminated body 46 ... container 46a ... outer edge portion 61, 61A ... cutting blade 62 ... blade portion 63 ... plate-like member

Claims (6)

An electrode laminate formed by laminating a positive electrode and a negative electrode is hermetically sealed in a container made of a metal laminate film together with an electrolyte, and external terminals connected to the positive electrode and the negative electrode protrude from the container and are exposed. A plurality of storage cells,
A power storage module comprising: a frame-shaped stack member interposed between the power storage cells arranged in a stacked manner in a state where the cell main surfaces are overlapped with each other, wherein the plurality of power storage cells are electrically connected in series or in parallel Because
An electrical storage module with an explosion-proof function, wherein a cutting blade that contacts an outer edge portion of the container expanded due to an increase in internal pressure to cleave the container is provided on the stack member.   The power storage module with explosion-proof function according to claim 1, wherein the cutting blade is a metal member and is fixed to the stack member made of a resin material.   The cutting blade is formed such that a plate-like member having blade portions at two locations is bent in two, and the two blade portions are directed to two adjacent storage cells. Item 3. A power storage module with an explosion-proof function according to Item 2.   The power storage module with explosion-proof function according to claim 1, wherein the cutting blade is formed integrally with the stack member made of a resin material.   The external terminal of the positive electrode and the external terminal of the negative electrode protrude in opposite directions, and the cutting blade has an outer edge portion on the side where the external terminal of the positive electrode protrudes and an external terminal of the negative electrode protrudes The storage module with an explosion-proof function according to any one of claims 1 to 4, wherein the storage module is provided corresponding to an outer edge portion on the side.   6. The power storage module with an explosion-proof function according to claim 1, wherein the cutting blade has a tip shape with a pointed shape in a triangular mountain shape.

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