JP2017199633A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the variation in the operation pressure of a short circuit mechanism.SOLUTION: A power storage device 100 comprises: an electrode assembly 3 including positive and negative electrodes; a case 1 having a terminal-attachment face, in which the electrode assembly 3 and an electrolyte solution can be encased; a positive electrode terminal 5 provided on the terminal-attachment face, and electrically connected with the positive electrode of the electrode assembly 3; a negative electrode terminal 7 provided on the terminal-attachment face, and electrically connected with the negative electrode of the electrode assembly 3; and a short circuit mechanism 10 provided on the terminal-attachment face, which causes a short circuit between the positive electrode terminal 5 and the negative electrode terminal 7 when a pressure of an internal space of the case 1 exceeds a predetermined value. The short circuit mechanism 10 has: a deformable plate 20 electrically connected with one electrode terminal of the positive electrode terminal 5 and the negative electrode terminal 7, and insulated from the other electrode terminal; and a short circuit plate 30 electrically connected with the other electrode terminal. When viewing the terminal-attachment face along a direction orthogonal to the terminal-attachment face, the other electrode terminal is disposed between the one electrode terminal and the short circuit mechanism 10.SELECTED DRAWING: Figure 1

Description

  The technology disclosed in this specification relates to a power storage device.

  The power storage device may be provided with a mechanism for short-circuiting between the positive electrode and the negative electrode when overcharge or the like occurs. For example, in the power storage device disclosed in Patent Document 1, a short-circuit mechanism is provided between the positive electrode terminal and the negative electrode terminal provided on the terminal mounting surface of the case. The short-circuit mechanism includes a deformation plate and a short-circuit plate that are arranged to face each other. The deformation plate is provided on the terminal mounting surface of the case, is electrically connected to the positive electrode terminal, and is insulated from the negative electrode terminal. The short-circuit plate is provided on the upper portion of the deformation plate and is electrically connected to the negative electrode terminal. When the pressure in the internal space of the case exceeds a predetermined value due to overcharge or the like, the deformed plate is deformed and contacts the short circuit plate. Then, the negative electrode terminal and the positive electrode terminal are short-circuited.

JP 2013-235814 A

  The short-circuit mechanism of Patent Document 1 is provided between the positive electrode terminal and the negative electrode terminal, and is provided at the center of the terminal mounting surface of the case. When the pressure in the internal space of the case increases, the case may be deformed, and the terminal mounting surface of the case may be deformed. At this time, the terminal mounting surface is greatly deformed as being closer to the central portion. For this reason, if the short-circuit mechanism is provided at a position close to the center of the terminal mounting surface of the case, the deformation plate of the short-circuit mechanism is easily affected by the deformation of the terminal mounting surface. When the deformation of the terminal mounting surface affects the deformation plate, the operating pressure of the short-circuit mechanism (that is, the pressure in the internal space of the case when the deformation plate is deformed) may change. This specification discloses the technique which suppresses the dispersion | variation in the operating pressure of a short circuit mechanism.

  The power storage device disclosed in this specification includes an electrode assembly including a positive electrode and a negative electrode, a terminal mounting surface, a case that can store the electrode assembly and an electrolyte, and a terminal mounting surface. A positive electrode terminal electrically connected to the positive electrode of the electrode assembly and a terminal mounting surface; a negative electrode terminal electrically connected to the negative electrode of the electrode assembly; and a terminal mounting surface. And a short-circuit mechanism for short-circuiting the positive electrode terminal and the negative electrode terminal when the pressure in the internal space of the case exceeds a predetermined value. The short-circuit mechanism is electrically connected to one electrode terminal of the positive electrode terminal and the negative electrode terminal, insulated from the other electrode terminal, a short-circuit plate electrically connected to the other electrode terminal, It has. The deformable plate can be deformed into a first state that is convex with respect to the short-circuit plate and a second state that is concave with respect to the short-circuit plate. When the pressure in the internal space of the case exceeds a predetermined value, the deformable plate changes from the first state to the second state, and the deformable plate comes into contact with the short-circuit plate. When the terminal mounting surface is viewed along the direction perpendicular to the terminal mounting surface, the negative electrode terminal is disposed between the positive electrode terminal and the short-circuit mechanism, or the positive electrode is disposed between the negative electrode terminal and the short-circuit mechanism. Electrode terminals are arranged.

  In the above power storage device, the negative electrode terminal is disposed between the positive electrode terminal and the short-circuit mechanism, or the positive electrode end is disposed between the negative electrode terminal and the short-circuit mechanism. That is, the short-circuit mechanism is not disposed between the positive electrode terminal and the negative electrode terminal, but at a position closer to the side surface of the case than the positive electrode terminal or the negative electrode terminal. For this reason, even if the terminal mounting surface is deformed before the pressure in the internal space of the case rises and reaches the operating pressure of the short-circuiting mechanism, the short-circuiting mechanism is disposed in an area where the deformation amount of the terminal mounting surface is small. Yes. For this reason, the influence of a deformation | transformation of a terminal attachment surface is suppressed, and the operating pressure of a deformation | transformation board becomes difficult to change. Therefore, it is possible to suppress variation in the operating pressure of the short-circuit mechanism.

Sectional drawing of the electrical storage apparatus which concerns on an Example. The figure which shows the state at the time of normal about the short circuit mechanism which concerns on an Example. The figure which shows the state short-circuited about the short circuit mechanism which concerns on an Example. The top view which shows the structure of the short circuit mechanism which concerns on an Example.

  The main features of the embodiments described below are listed. The technical elements described below are independent technical elements and exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Absent.

(Feature 1) In the power storage device disclosed in the present specification, the deformation plate may be supported by the terminal mounting surface of the case. When the terminal mounting surface is viewed along a direction orthogonal to the terminal mounting surface, the other electrode terminal may be disposed between one electrode terminal and the short-circuit mechanism. According to such a configuration, since the distance between the other electrode terminal and the short-circuit mechanism can be shortened, these electrical connections can be easily performed.

(Feature 2) In the power storage device disclosed in this specification, when the terminal mounting surface is viewed along a direction orthogonal to the terminal mounting surface, (1) the terminal mounting surface has a rectangular shape having a long side and a short side. You may do it. (2) The short-circuit mechanism, the other electrode terminal, and the one electrode terminal may be arranged along the direction in which the long side extends. (3) The short-circuit mechanism and the other electrode terminal may be arranged on one side of the center of the long side. (4) One electrode terminal may be arrange | positioned on the other side rather than the center of the long side of a terminal attachment surface. According to such a configuration, the short-circuit mechanism is disposed at a position closer to one side than the center of the long side of the terminal mounting surface. For this reason, a short circuit mechanism will be arrange | positioned in the area | region where the deformation amount of the terminal attachment surface of a case is small, and it can suppress suitably that dispersion | variation arises in the operating pressure of a short circuit mechanism.

(Characteristic 3) In the power storage device disclosed in the present specification, when the terminal mounting surface is viewed along a direction orthogonal to the terminal mounting surface, the short-circuit mechanism is located closer to one of the long sides than the center of the short side. It may be arranged. According to such a configuration, the short-circuit mechanism is disposed at a position closer to the long side than the center of the short side of the terminal mounting surface. For this reason, a short circuit mechanism is arrange | positioned in the area | region where the deformation amount of the terminal attachment surface of a case is smaller, and it can suppress suitably that a dispersion | variation arises in the operating pressure of a short circuit mechanism.

(Characteristic 4) In the power storage device disclosed in the present specification, the deformation plate may be formed of an aluminum alloy containing 0.7 wt% or more and 1.3 wt% or less of iron. According to such a configuration, it is possible to reduce the residual stress generated when the deformed plate is formed. For this reason, even if the power storage device is used for a long period of time, it is possible to prevent malfunction of the short-circuit mechanism.

  Hereinafter, a power storage device 100 according to an embodiment will be described with reference to the drawings. As shown in FIG. 1, the power storage device 100 includes a case 1, an electrode assembly 3 accommodated in the case 1, a positive electrode terminal 5 and a negative electrode terminal 7 fixed to the case 1. The electrode assembly 3 and the positive electrode terminal 5 are electrically connected, and the electrode assembly 3 and the negative electrode terminal 7 are electrically connected. In addition, the power storage device 100 includes a short-circuit mechanism 10 fixed to the case 1. The inside of the case 1 is injected with an electrolytic solution, and the electrode assembly 3 is immersed in the electrolytic solution.

  The case 1 is made of metal and is a substantially rectangular parallelepiped box-shaped member. The case 1 includes a main body 111 and a lid portion 112 fixed to the main body 111. The lid part 112 covers the upper part of the main body 111. The lid portion 112 has a substantially rectangular shape in which the dimension in the x direction is larger than the dimension in the y direction when viewed in plan. Mounting holes 81 and 82 are formed in the lid portion 112. The positive electrode terminal 5 communicates with the inside and outside of the case 1 through the attachment hole 81, and the negative electrode terminal 7 communicates with the inside and outside of the case 1 through the attachment hole 82. That is, the positive electrode terminal 5 and the negative electrode terminal 7 are attached to the lid portion 112. The lid portion 112 is electrically connected to the positive electrode terminal 5. An insulating member 61 is disposed between the lid portion 112 and the negative electrode terminal 7. The insulating member 61 insulates the lid portion 112 from the negative electrode terminal 7. The lid 112 is an example of the “terminal mounting surface” in the claims.

  The electrode assembly 3 includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode. The electrode assembly 3 is configured by laminating a plurality of laminated bodies including a positive electrode, a negative electrode, and a separator. Each of the plurality of positive electrodes and each of the plurality of negative electrodes includes a current collecting member and an active material layer formed on the current collecting member. As the current collecting member, one used for the positive electrode is, for example, an aluminum foil, and one used for the negative electrode is, for example, a copper foil. The electrode assembly 3 includes a positive current collecting tab 51 provided for each positive electrode and a negative current collecting tab 52 provided for each negative electrode. The positive electrode current collecting tab 51 is formed on the upper end portion of the positive electrode. The negative electrode current collecting tab 52 is formed on the upper end portion of the negative electrode. The positive electrode current collecting tab 51 and the negative electrode current collecting tab 52 protrude above the electrode assembly 3. The plurality of positive electrode current collecting tabs 51 are combined into one and fixed to the positive electrode lead 53. The plurality of negative electrode current collecting tabs 52 are combined into one and fixed to the negative electrode lead 54.

  The positive electrode lead 53 is connected to the positive electrode current collecting tab 51 and the positive electrode terminal 5. The positive electrode current collecting tab 51 and the positive electrode terminal 5 are electrically connected via the positive electrode lead 53. The negative electrode lead 54 is connected to the negative electrode current collecting tab 52 and the negative electrode terminal 7. The negative electrode current collecting tab 52 and the negative electrode terminal 7 are electrically connected via the negative electrode lead 54.

  The positive electrode terminal 5 is attached to the lid portion 112 via the attachment hole 81. The positive electrode terminal 5 is disposed in the vicinity of a side (side extending in the depth direction on the right side in FIG. 1) parallel to the short axis direction (y direction) of the lid portion 112. That is, the positive electrode terminal 5 is on a side parallel to the short axis direction (y direction) from the center of the long axis (x direction) of the lid 112 (side extending in the depth direction on the x direction (+) side in FIG. 1). It is arranged at a close position. The negative electrode terminal 7 is attached to the lid portion 112 via the attachment hole 82. The negative electrode terminal 7 is a side parallel to the minor axis direction (y direction) of the lid portion 112 and is on the side opposite to the side where the positive electrode terminal 5 is disposed (in the depth direction on the left side in FIG. 1). It is arranged in the vicinity of the extending side). That is, the negative electrode terminal 7 is located on a side parallel to the short axis direction (y direction) from the center of the long axis (x direction) of the lid portion 112 (side extending in the depth direction on the x direction (−) side in FIG. 1). It is arranged at a close position.

  The short-circuit mechanism 10 will be described with reference to FIG. As shown in FIG. 2, the short-circuit mechanism 10 is provided on the lid portion 112 of the case 1. The short-circuit mechanism 10 is disposed at a position closer to the side parallel to the minor axis direction (y direction) of the lid 112 than the negative electrode terminal 7 (that is, on the x direction (−) side from the negative electrode terminal 7 in FIG. 1). Yes. The short-circuit mechanism 10 includes a deformation plate 20 and a short-circuit plate 30. The deformable plate 20 is a conductive diaphragm that is formed of a plate material having a constant plate thickness and is circular when viewed in plan. The deformation plate 20 is supported by the lid portion 112 of the case 1 and is fixed by welding or the like. The plate thickness of the deformable plate 20 is smaller than the plate thickness of the lid portion 112, and smaller than the plate thickness of the short-circuit plate 30. The deformation plate 20 is convex downward (concave toward the short-circuit plate 30) when the pressure in the case 1 is lower than a predetermined value. The outer peripheral portion of the deformation plate 20 is joined to the lid portion 112 of the case 1. For this reason, the pressure in the case 1 acts on the lower surface of the deformation plate 20. On the other hand, atmospheric pressure acts on the upper surface of the deformation plate 20. The deformation plate 20 is electrically connected to the lid portion 112. As described above, the lid portion 112 is electrically connected to the positive electrode terminal 5 and insulated from the negative electrode terminal 7. For this reason, the deformation plate 20 is electrically connected to the positive electrode terminal 5 and insulated from the negative electrode terminal 7.

  For the deformable plate 20, for example, aluminum or an aluminum alloy can be used. As the aluminum alloy, for example, an aluminum alloy A1050, an aluminum alloy A3003, or the like can be used, and it is particularly preferable to use an aluminum alloy containing 0.7 wt% or more and 1.3 wt% or less of iron (Fe). The iron-containing aluminum alloy described above is characterized in that the generation of residual stress due to plastic working is suppressed, and as a result, the tensile strength is not easily lowered even after a long period of time, and the temporal change of the residual stress is small. . For this reason, when the deformation | transformation board 20 is shape | molded using said iron containing aluminum alloy, even if it does not heat-process after shaping | molding of the deformation | transformation board 20, the temporal change of a residual stress (namely, tensile strength) can be suppressed low. For this reason, even if the power storage device 100 is used for a long period of time, the deformation pressure of the deformation plate 20 is unlikely to decrease, and the short-circuit mechanism 10 is unlikely to malfunction. The deformable plate 20 may be integrally formed with the lid portion 112 of the case 1. When the deformable plate 20 and the lid portion 112 are integrally formed, the number of processing steps during manufacturing can be reduced, and the power storage device 100 can be manufactured more easily.

  The short circuit board 30 is a metal member and has conductivity. The short-circuit plate 30 is formed in a substantially rectangular shape in plan view, and is disposed above the deformation plate 20. The thickness of the short-circuit plate 30 is larger than the thickness of the deformation plate 20. The short-circuit plate 30 is electrically connected to the negative electrode terminal 7. Insulating members 61 and 62 are disposed between the short-circuit plate 30 and the lid portion 112 of the case 1. The short-circuit plate 30 is supported on the lid portion 112 by insulating members 61 and 62. The insulating member 61 insulates the negative electrode terminal 7 from the lid portion 112 and also insulates one end of the short-circuit plate 30 from the lid portion 112. The insulating member 62 insulates the other end of the short-circuit plate 30 and the lid portion 112. For this reason, the short-circuit plate 30 is insulated from the lid portion 112. That is, the short-circuit plate 30 is insulated from the positive electrode terminal 5. In this embodiment, the deformable plate 20 is connected to the positive electrode terminal 5 and the short-circuit plate 30 is connected to the negative electrode terminal 7, but the present invention is not limited to such a configuration. For example, the deformation plate may be connected to the negative electrode terminal 7 and the short-circuit plate may be connected to the positive electrode terminal 5. Specifically, the deformable plate is formed using a conductive metal, is insulated from the positive electrode terminal 5, and is electrically connected to the negative electrode terminal 7. The short-circuit plate is formed using, for example, aluminum or an aluminum alloy, and is electrically connected to the positive electrode terminal 5 and insulated from the negative electrode terminal 7. Further, in this embodiment, the negative electrode terminal 7 electrically connected to the short-circuit plate 30 is disposed between the positive electrode terminal 5 electrically connected to the deformation plate 20 and the short-circuit mechanism 10. However, it is not limited to such a configuration. For example, the positive electrode terminal 5 electrically connected to the deformation plate may be disposed between the negative electrode electrode electrically connected to the short-circuit plate and the short-circuit mechanism.

  With reference to FIG.2 and FIG.3, the structure by which the positive electrode terminal 5 and the negative electrode terminal 7 are short-circuited by the short circuit mechanism 10 is demonstrated concretely. As shown in FIG. 2, when the pressure in the case 1 is equal to or lower than a predetermined value, the deformable plate 20 is convex downward. That is, the deformable plate 20 is in a concave first state toward the short-circuit plate 30. As described above, the deformation plate 20 is electrically connected to the positive electrode terminal 5 and insulated from the negative electrode terminal 7. For this reason, an energization path via the short-circuit mechanism 10 is not formed between the positive electrode terminal 5 and the negative electrode terminal 7. When the pressure in the case 1 increases, the pressure acting on the lower surface of the deformation plate 20 increases. On the other hand, atmospheric pressure acts on the upper surface of the deformation plate 20. For this reason, when the pressure in the case 1 rises and reaches a predetermined value, as shown in FIG. 3, the deformable plate 20 is inverted and changes to a convex state upward. That is, the deformable plate 20 enters the second state that is convex toward the short-circuit plate 30. At this time, the upper surface of the deformation plate 20 contacts the short-circuit plate 30. The deformation plate 20 is electrically connected to the positive electrode terminal 5. On the other hand, the short-circuit plate 30 is electrically connected to the negative electrode terminal 7. For this reason, when the deformation | transformation board 20 and the short circuit board 30 contact, between the positive electrode terminal 5 and the negative electrode terminal 7, the electricity supply path via the deformation board 20 and the short circuit board 30 will be formed. That is, the positive electrode terminal 5 and the negative electrode terminal 7 are short-circuited. As a result, the current flowing through the electrode assembly 3 can be reduced.

  With reference to FIG.1 and FIG.4, arrangement | positioning of the short circuit mechanism 10 on the cover part 112 is demonstrated. As shown in FIG. 1, the short-circuit mechanism 10, the negative electrode terminal 7, and the positive electrode terminal 5 are arranged in this order in the major axis direction (x direction) of the lid portion 112. As described above, the short-circuit mechanism 10 and the negative electrode terminal 7 are arranged on one side (the left side in FIG. 1) from the center of the long axis (x direction) of the lid portion 112. The short-circuit mechanism 10 is disposed closer to the side parallel to the short axis of the lid portion 112 (side extending in the depth direction on the x direction (−) side in FIG. 1) than the negative electrode terminal 7. Further, as shown in FIG. 4, the deformation plate 20 of the short-circuit mechanism 10 is arranged on one side (upper side in FIG. 4 (y direction (+) side)) from the center of the short axis (y direction) of the lid portion 112. Has been. That is, the deformable plate 20 is disposed in the vicinity of the side parallel to the long axis of the lid 112 rather than the center of the lid 112 in the short axis direction. Therefore, the deformation plate 20 is disposed in the vicinity of the side parallel to the long axis of the lid portion 112 and in the vicinity of the side parallel to the short axis. That is, the deformation plate 20 is disposed in the vicinity of the corner of the lid portion 112. In this embodiment, the deformation plate 20 is arranged on the y direction (+) side (upper side in FIG. 4), but may be arranged on the y direction (−) side (lower side in FIG. 4). . The side parallel to the long axis of the lid part 112 is an example of “long side” in the claims, and the side parallel to the short axis direction of the lid part 112 is an example of “short side” in the claims. .

  When the pressure in the internal space of the case 1 increases, the pressure in the case 1 increases. For this reason, in the process in which the pressure in the case increases, the case 1 may be deformed in a direction protruding from the inside toward the outside. At this time, the amount of deformation of each surface constituting the case 1 increases as the distance from the surface becomes closer to the center. Therefore, also in the lid part 112, the center of the long axis (x direction) and the center of the short axis (y direction) have the largest deformation amount, and the deformation amount becomes smaller as it approaches each side of the lid part 112. Go. As described above, the deformation plate 20 is fixed to the lid portion 112. When the deformation plate 20 is provided in a region where the deformation amount of the lid portion 112 is large, the support state of the deformation plate 20 changes when the lid portion 112 is deformed, and the operating pressure of the deformation plate 20 (the deformation plate 20 starts to deform). (Pressure) may change. When the operating pressure of the deformation plate 20 changes, the deformation plate 20 is deformed before the pressure in the internal space of the case 1 reaches a predetermined value, or even if the pressure exceeds the predetermined value, the deformation plate 20 does not deform. A possibility arises. The deformation plate 20 of the present embodiment is disposed in a region where the deformation amount of the lid portion 112 is relatively small. For this reason, even if the pressure in the internal space of the case 1 rises and the case 1 is deformed, the area around the deformable plate 20 of the lid 112 is hardly deformed. Therefore, a change in the operating pressure of the deformation plate 20 can be suppressed. In this way, it is possible to suppress the occurrence of variations in the pressure in the case 1 where the short-circuit mechanism 10 operates, and to prevent the short-circuit mechanism 10 from malfunctioning or not operating. .

  In the present embodiment, among the components of the short-circuit mechanism 10, only the deformation plate 20 is disposed in the vicinity of the side parallel to the long axis direction of the lid portion 112, but is not limited to such a configuration. For example, both the deformation plate 20 and the short-circuit plate may be disposed in the vicinity of the side parallel to the long axis direction of the lid portion 112. As described above, the short-circuit mechanism 10 short-circuits between the positive electrode terminal 5 and the negative electrode terminal 7 by bringing the deformation plate 20 into contact with the short-circuit plate 30. For this reason, the short circuit board should just be arrange | positioned so that it can contact when the deformation | transformation board 20 deform | transforms, and the magnitude | size and shape of a short circuit board are not limited as long as it can contact with the deformation board 20 at the time of an action | operation.

  As mentioned above, although the specific example of the technique disclosed by this specification was demonstrated in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing.

DESCRIPTION OF SYMBOLS 1 Case 3 Electrode assembly 5 Positive electrode terminal 7 Negative electrode terminal 10 Short circuit mechanism 20 Deformation board 30 Short circuit board 61, 62 Insulation member 100 Power storage device 112 Cover part

Claims (5)

An electrode assembly comprising a positive electrode and a negative electrode;
A terminal mounting surface, and a case capable of storing the electrode assembly and the electrolyte;
A positive electrode terminal provided on the terminal mounting surface and electrically connected to the positive electrode of the electrode assembly;
A negative electrode terminal provided on the terminal mounting surface and electrically connected to the negative electrode of the electrode assembly;
A short-circuit mechanism provided on the terminal mounting surface, and short-circuiting the positive electrode terminal and the negative electrode terminal when the pressure in the internal space of the case exceeds a predetermined value,
The short-circuit mechanism is electrically connected to one electrode terminal of the positive electrode terminal and the negative electrode terminal, electrically connected to the deformation plate insulated from the other electrode terminal, and electrically connected to the other electrode terminal. A short circuit board, and
The deformable plate is deformable into a first state that is convex with respect to the short-circuit plate and a second state that is concave with respect to the short-circuit plate,
When the pressure in the internal space of the case exceeds the predetermined value, the deformation plate is changed from the first state to the second state, the deformation plate is in contact with the short-circuit plate,
When the terminal mounting surface is viewed along a direction orthogonal to the terminal mounting surface, the negative electrode terminal is disposed between the positive electrode terminal and the short-circuit mechanism, or the negative electrode terminal and the short circuit A power storage device in which the positive electrode terminal is arranged between the mechanism. The deformation plate is supported on the terminal mounting surface of the case,
The said other electrode terminal is arrange | positioned between said one electrode terminal and the said short circuit mechanism when the said terminal attachment surface is seen along the direction orthogonal to the said terminal attachment surface. Power storage device. When the terminal mounting surface is viewed along a direction orthogonal to the terminal mounting surface, (1) the terminal mounting surface has a rectangular shape having a long side and a short side, and (2) the short-circuit mechanism and the The other electrode terminal and the one electrode terminal are arranged along the direction in which the long side extends, and (3) the short-circuit mechanism and the other electrode terminal are on one side from the center of the long side. The power storage device according to claim 2, wherein (4) the one electrode terminal is disposed on the other side of the center of the long side.   The electrical storage according to claim 3, wherein when the terminal mounting surface is viewed along a direction orthogonal to the terminal mounting surface, the short-circuit mechanism is disposed at a position closer to the long side than the center of the short side. apparatus. The power storage device according to any one of claims 1 to 4, wherein the deformable plate is formed of an aluminum alloy containing 0.7 wt% or more and 1.3 wt% or less of iron.

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