Power storage device

Abstract

To provide a power storage device capable of suppressing an increase in a time required to disconnect the power storage device at an appropriate position.SOLUTION: A power storage device 1 includes a power storage module 200 including a plurality of power storage cells 210, and a case 100 that houses the power storage module 200. An outer surface 101 and an outer surface 102 of the case 100 are provided with recesses 11 (information providing portions) and recesses 12 (information providing portions), respectively, that indicate the cut portions of the case 100 that are to be cut when the power storage device 1 is disassembled.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an electricity storage device. [Background technology]

[0002] JP-A-2023-502457 (Patent Document 1) discloses a battery including a housing and a plurality of electrode body sets. The plurality of electrode body sets are provided inside the housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2023-502457 Summary of the Invention [Problem to be solved by the invention]

[0004] Although not explicitly stated in Patent Document 1, there are cases where a battery (electricity storage device) is disassembled for recycling or the like. In this case, it is necessary to cut the battery at an appropriate position so as not to damage, for example, the electrode assembly (electricity storage cell). However, for example, an inexperienced worker may take a long time to identify the appropriate position. In this case, it takes a long time to cut the battery at the appropriate position.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide an energy storage device that can prevent the time required to disconnect the energy storage device at an appropriate position from increasing. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, there is provided an energy storage device including an energy storage module including at least one energy storage cell, and a case for housing the energy storage module, wherein an information providing portion is provided on an outer surface of the case to indicate a cutting portion of the case to be cut when dismantling the energy storage device.

[0007] In the energy storage device according to one aspect of the present disclosure, as described above, an information providing unit is provided on the outer surface of the case to indicate the cutting portion of the case to be cut when dismantling the energy storage device. By presetting an appropriate position for cutting the battery as the cutting portion, the case can be easily cut at the appropriate position based on the information provided by the information providing unit. As a result, it is possible to prevent the time required to cut the energy storage device at the appropriate position from increasing.

[0008] In the energy storage device according to the above aspect, the at least one energy storage cell preferably includes a plurality of energy storage cells. The energy storage module includes a connection portion that connects different energy storage cells among the plurality of energy storage cells. The cutting portion is a portion corresponding to the connection portion. With this configuration, the portion of the case that corresponds to the connection portion provided between the energy storage cells is cut, thereby preventing the energy storage cells from being cut (damaged).

[0009] In the power storage device according to the above aspect, the case preferably has a sealed structure. Here, the sealed structure of the case makes it difficult to visually check the inside of the case. Therefore, providing an information providing portion indicating the cut portion of the case on the outer surface of the case is particularly effective in identifying the cut portion of the case (a suitable position for cutting) without visually checking the inside of the case.

[0010] In the power storage device according to the aforementioned aspect, the cutting portion preferably includes a weakened portion. With this configuration, the operation of cutting the case along the cutting portion can be facilitated (simplified).

[0011] In the power storage device according to the aforementioned aspect, the information providing unit preferably includes at least one of a line and a mark marked on the outer surface of the case so as to visually indicate the cut portion. With this configuration, the cut portion of the case can be easily identified based on at least one of the line and the mark.

[0012] In the power storage device according to the aforementioned aspect, the information providing unit preferably includes at least one of a recess and a protrusion formed on the outer surface of the case so as to visually indicate the cut portion. With this configuration, the cut portion of the case can be easily identified based on the at least one of the recess and the protrusion.

[0013] In the power storage device according to the above aspect, the information providing unit preferably includes a member attached to the outer surface of the case so as to visually indicate the cut portion. With this configuration, the cut portion of the case can be easily identified based on the member attached to the outer surface of the case.

[0014] In the power storage device according to the above aspect, the information providing unit preferably includes a code from which information about the cut portion can be acquired by being imaged by the information acquisition device. With this configuration, the cut portion of the case can be easily identified based on the information acquired by imaging the code. [Effects of the Invention]

[0015] According to the present disclosure, it is possible to prevent the time required to disconnect the power storage device at an appropriate position from increasing. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view illustrating a configuration of an electricity storage device according to an embodiment. [Figure 2] FIG. 2 is a partially enlarged perspective view showing the configuration of a case and an electricity storage module according to an embodiment. [Figure 3] FIG. 2 is a schematic plan view showing an arrangement of a plurality of storage cells according to one embodiment. [Figure 4] FIG. 1 is an exploded perspective view showing a configuration of a storage cell according to one embodiment. [Figure 5] 1 is a side view from the Y1 side showing the configuration of an electricity storage device according to an embodiment. [Figure 6] 1 is a side view from the X1 side showing the configuration of a power storage device according to an embodiment. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5. [Figure 8] FIG. 7 is a cross-sectional view taken along line VIII-VIII in FIG. 6. [Figure 9] FIG. 6 is a cross-sectional view taken along line IX-IX in FIG. 5. [Figure 10] FIG. 10 is a side view showing the configuration of a power storage device according to a first modified example of an embodiment. [Figure 11] FIG. 10 is a partially enlarged cross-sectional view showing a protrusion provided on a case according to a second modified example of the embodiment. [Figure 12] FIG. 10 is a side view showing the configuration of a power storage device according to a third modified example of an embodiment. [Figure 13] FIG. 10 is a perspective view showing a configuration of a power storage device according to a fourth modified example of an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0018] FIG. 1 is a perspective view that schematically illustrates a power storage device 1 according to an embodiment of the present disclosure. The power storage device 1 is a device for storing electric power for driving, for example, an electric vehicle (not shown). The power storage device 1 may also be provided in an electrical device other than an electric vehicle (for example, a stationary power storage device). The X direction, Y direction, and Z direction in this specification are directions that are perpendicular to one another. For example, the X direction and the Y direction may correspond to the front-rear direction and the left-right direction of the electric vehicle, respectively. The Z direction may also be the vertical direction.

[0019] 1 and 2, the energy storage device 1 includes a case 100 and an energy storage module 200 (see FIG. 2). The case 100 is made of aluminum, for example.

[0020] Referring to FIG. 1, case 100 is formed in a rectangular parallelepiped shape. Case 100 is formed in a rectangular parallelepiped shape that is long in the X direction. Specifically, case 100 has a length L1 in the X direction. Case 100 has a length L2 in the Y direction. Length L1 is greater than length L2. Case 100 has a height H in the Z direction. Height H is less than length L1. Height H is greater than length L2. Note that the shape of case 100 (the relationship between the dimensions in each direction) is not limited to the above example.

[0021] Referring to FIG. 2, the case 100 includes a case body 10 and a lid 20. The case body 10 is formed in a rectangular cylindrical shape that is long in the X direction. The lid 20 is connected to the case body 10 by welding or the like so as to close an opening 10a on the X2 side of the case body 10. The case body 10 does not have any openings other than the opening 10a. In other words, the case 100 has a sealed structure. The energy storage module 200 is inserted into the case body 10 through the opening 10a. For simplicity, a recess 11, which will be described later, is not shown in FIG. 2.

[0022] The energy storage module 200 includes a plurality of energy storage cells 210. In this embodiment, the number of energy storage cells 210 is eight. However, the number of energy storage cells 210 is not limited to eight. An example of each energy storage cell 210 is a lithium ion battery. Each energy storage cell 210 may be configured as a so-called all-solid-state battery that includes a solid electrolyte. Each of the plurality of energy storage cells 210 has a shape that is longer in the X direction than in the Y direction and that is longer in the X direction than in the Z direction. Each of the plurality of energy storage cells 210 has a shape that is longer in the Z direction than in the Y direction.

[0023] 3, the eight storage cells 210 are electrically connected in series. The eight storage cells 210 include a storage cell 210A, a storage cell 210B, a storage cell 210C, a storage cell 210D, a storage cell 210E, a storage cell 210F, a storage cell 210G, and a storage cell 210H. The storage cells 210A to 210D are arranged in the X direction. Specifically, the storage cell 210A, the storage cell 210B, the storage cell 210C, and the storage cell 210D are arranged in this order from the X2 side. The storage cells 210E to 210H are arranged in the X direction. Specifically, the storage cell 210E, the storage cell 210F, the storage cell 210G, and the storage cell 210H are arranged in this order from the X1 side.

[0024] The column of the power storage cells 210A to 210D and the column of the power storage cells 210E to 210H are adjacent to each other in the Y direction. Specifically, the power storage cell 210A and the power storage cell 210H are adjacent to each other in the Y direction. The power storage cell 210B and the power storage cell 210G are adjacent to each other in the Y direction. The power storage cell 210C and the power storage cell 210F are adjacent to each other in the Y direction. The power storage cell 210D and the power storage cell 210E are adjacent to each other in the Y direction.

[0025] The power storage cell 210A and the power storage cell 210B are electrically connected by a connection portion 220. The power storage cell 210B and the power storage cell 210C are electrically connected by the connection portion 220. The power storage cell 210C and the power storage cell 210D are electrically connected by the connection portion 220. The power storage cell 210D and the power storage cell 210E are electrically connected by the connection portion 220. The power storage cell 210E and the power storage cell 210F are electrically connected by the connection portion 220. The power storage cell 210F and the power storage cell 210G are electrically connected by the connection portion 220. The power storage cell 210G and the power storage cell 210H are electrically connected by the connection portion 220. The connection portion 220 that electrically connects the power storage cell 210D and the power storage cell 210E is bent into a U shape. Each of the plurality of connection parts 220 other than the connection part 220 between the power storage cell 210D and the power storage cell 210E is formed in a straight line.

[0026] Fig. 4 is an exploded perspective view of the energy storage cell 210. Each energy storage cell 210 has at least one electrode body 211, a spacer 212, a terminal member 213, a current collecting terminal 214, a cover 215, and a laminated outer casing 216 (see Fig. 9, etc.). Note that the laminated outer casing 216 is not shown in Fig. 4. Also, the laminated outer casing 216 of the energy storage cell 210B (see Fig. 3) and the laminated outer casing 216 of the energy storage cell 210G (see Fig. 3) are not shown in Fig. 2.

[0027] At least one electrode body 211 includes two electrode bodies 211. However, the number of electrode bodies 211 is not limited to two. Each electrode body 211 is configured as a wound body in which a positive electrode sheet and a negative electrode sheet are wound with a separator interposed therebetween. However, each electrode body 211 may be configured as a laminate in which a positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween. The two electrode bodies 211 are adjacent to each other in the Y direction in which the positive electrode sheet and the negative electrode sheet are stacked on top of each other. Each electrode body 211 is formed in a shape elongated in the X direction.

[0028] Each electrode body 211 has a coated portion 211a and an electrode tab 211b. The coated portion 211a is a region of the electrode foil on the positive electrode sheet or negative electrode sheet where an active material layer is provided. The electrode tab 211b is a region of the electrode foil on the positive electrode sheet or negative electrode sheet where no active material layer is provided (i.e., an uncoated portion where the electrode foil is exposed).

[0029] The spacer 212 is disposed between a pair of adjacent electrode tabs 211b. The spacer 212 is made of an insulating material (synthetic resin, etc.). The spacer 212 has a shape such that its dimension in the Y direction gradually increases as it moves away from the coated portion 211a in the X direction.

[0030] The terminal members 213 are connected to the outer surfaces of the spacers 212 in the X direction. The terminal members 213 are made of a conductive material (metal such as copper or aluminum). The terminal members 213 are connected to a pair of electrode tabs 211b adjacent to each other in the Y direction.

[0031] The current collecting terminal 214 is connected to a terminal member 213. The current collecting terminal 214, which is electrically connected to the positive electrode tab 211b via the terminal member 213, is made of, for example, aluminum. The current collecting terminal 214, which is electrically connected to the negative electrode tab 211b via the terminal member 213, is made of, for example, copper. The current collecting terminal 214 has a connecting portion 214a and a protruding portion 214b.

[0032] The connection portion 214a is connected to the outer surface of the terminal member 213 in the X direction by welding or the like. The connection portion 214a is formed in a flat plate shape.

[0033] The protruding portion 214b protrudes outward in the X direction from the connecting portion 214a. The protruding portion 214b is formed in a flat plate shape. The energy storage cells 210 that are electrically connected to each other are electrically connected by connecting their protruding portions 214b to each other. The electrically connected protruding portions 214b form a connecting portion 220 (see FIG. 3).

[0034] The cover 215 covers the end (electrode tab 211b) of the electrode body 211 in the X direction. The cover 215 is made of an insulating material (synthetic resin, etc.). The cover 215 is provided with a through hole 215a through which the protrusion 214b is inserted.

[0035] The laminated exterior body 216 houses the electrode bodies 211, the spacer 212, the terminal member 213, a part of the current collecting terminal 214, and the cover 215. The laminated exterior body 216 is made of a laminated film.

[0036] The external terminal 21 (see FIG. 2) is provided on the lid 20. The external terminal 21 is electrically connected to the X2-side current collecting terminal 214 of the storage cell 210 (storage cells 210A and 210H) that is arranged closest to the lid 20 among the multiple storage cells 210.

[0037] Here, the power storage device may be dismantled for recycling or the like. In this case, it is necessary to cut the power storage device at an appropriate position so as not to damage the power storage cells, for example. However, for example, an inexperienced worker may take a long time to identify the appropriate position. In this case, it takes a long time to cut the power storage device at the appropriate position.

[0038] Therefore, in this embodiment, as shown in FIG. 1 , recesses 11 are provided on an outer surface 101 of the case 100, indicating cut portions of the case 100 to be cut when dismantling the energy storage device 1. The recesses 11 visually indicate the cut portions of the case 100. The outer surface 101 is, for example, an outer surface provided on the side surface 101a on the Y1 side of a pair of side surfaces 101a (see FIG. 7 ) perpendicular to the Y direction. A plurality of recesses 11 (four in this embodiment) are provided on the outer surface 101. The recesses 11 are arranged side by side in the X direction. By cutting the energy storage device 1 along the recesses 11, the energy storage cells 210 arranged side by side in the X direction are separated from each other. Furthermore, the energy storage cells 210 arranged side by side in the X direction are separated from the external terminals 21. Note that cutting the energy storage device 1 along the recesses 11 means cutting the energy storage device 1 at the X direction positions where the recesses 11 are provided. Furthermore, the recesses 11 are an example of an "information providing portion" in the present disclosure.

[0039] The recess 11 is provided on the outer surface 101 so as to extend in the Z direction. That is, the recess 11 forms a groove extending in the Z direction on the outer surface 101. Specifically, the recess 11 extends from the end of the outer surface 101 on the Z1 side to the end of the outer surface 101 on the Z2 side. Note that the shape and length of the recess 11 are not limited to the above example.

[0040] Further, recesses 12 are provided on the outer surface 102 of the case 100, indicating the cutting portions of the case 100 to be cut when dismantling the energy storage device 1. The outer surface 102 is, for example, an outer surface provided on the side surface 102a on the X1 side of a pair of side surfaces 102a (see FIG. 8) perpendicular to the X direction. Only one recess 12 is provided on the outer surface 102. By cutting the energy storage device 1 along the recess 12, the energy storage cells 210 adjacent in the Y direction are separated from each other. Note that cutting the energy storage device 1 along the recess 12 means cutting the energy storage device 1 at the Y direction position where the recess 12 is provided. Furthermore, the recess 12 is an example of an "information providing portion" in the present disclosure.

[0041] The recess 12 is provided on the outer surface 102 so as to extend in the Z direction. That is, the recess 12 forms a groove extending in the Z direction on the outer surface 102. Specifically, the recess 12 extends from the end of the outer surface 102 on the Z1 side to the end of the outer surface 102 on the Z2 side. Note that the shape and length of the recess 12 are not limited to the above example.

[0042] In this embodiment, the cut portion of the case 100 indicated by the recesses (11, 12) is a portion corresponding to the connection portion 220 (see FIG. 3, etc.) A detailed description will be given with reference to FIG.

[0043] Fig. 5 is a front view of the outer surface 101. As shown in Fig. 5, each of the multiple recesses 11 is provided at a position overlapping with the connection portion 220 (protrusion 214b) in the Y direction. Specifically, of the four recesses 11 provided on the outer surface 101, each of the three recesses 11 on the X1 side is provided at a position overlapping with the connection portion 220 in the Y direction. Of the four recesses 11 provided on the outer surface 101, the recess 11 closest to the X2 side is provided at a position overlapping with the protrusion 214b that electrically connects the energy storage cell 210 (210A, 210H) closest to the X2 side and the external terminal 21.

[0044] Each of the plurality of recesses 11 has a width W1 in the X direction. Furthermore, the connection portion 220 that connects the energy storage cells 210 adjacent to each other in the X direction has a width W2 in the X direction. The width W1 is smaller than the width W2. The width W2 is twice the length that the protrusion 214b (see FIG. 4) protrudes from the through-hole 215a (see FIG. 4) in the X direction. Therefore, the width W1 may be smaller than half the width W2. This prevents each of the plurality of recesses 11 from being provided at a position that overlaps with the energy storage cell 210 in the Y direction.

[0045] Fig. 6 is a front view of the outer surface 102. As shown in Fig. 6, the recess 12 is provided at a position overlapping with the connection portion 220 in the X direction. Specifically, the recess 12 is provided at the center of the outer surface 102 in the Y direction. As a result, the recess 12 is provided at a position overlapping with the space between two storage cells 210 lined up in the Y direction (the contact surfaces between the storage cells 210) in the X direction.

[0046] In this embodiment, the cut portion of the case 100 indicated by the recess 11 (12) includes a weakened portion. In other words, a weakened portion is formed at a position corresponding to the cut portion.

[0047] 7, the thin-walled portion 11a is formed on the side surface 101a by providing a recess 11 in the outer surface 101. That is, the thin-walled portion 11a is a portion of the side surface 101a that is provided on the Y2 side (the inner surface side of the case body 10) of the recess 11. The thin-walled portion 11a is an example of a "weak portion" in the present disclosure.

[0048] The thin portion 11a has a thickness t1 in the Y direction. The thickness t1 of the thin portion 11a is smaller than a thickness t2 in the Y direction of a portion of the side surface 101a where the thin portion 11a is not provided. The thickness t1 may be, for example, ½ or less of the thickness t2.

[0049] 8, the side surface 102a has a thin portion 12a formed by providing a recess 12 in the outer surface 102. The thin portion 12a is a portion of the side surface 102a that is provided on the Y2 side (the inner surface side of the case body 10) of the recess 12. The thin portion 12a is an example of a "weak portion" in the present disclosure.

[0050] The thin portion 12a has a thickness t11 in the X direction. The thickness t11 of the thin portion 12a is smaller than a thickness t12 in the X direction of a portion of the side surface 102a where the thin portion 12a is not provided. The thickness t11 may be, for example, ½ or less of the thickness t12.

[0051] Fig. 9 is a cross-sectional view taken along line IX-IX in Fig. 5. The energy storage module 200 includes a covering sheet 230. The covering sheet 230 is housed in a case 100. A case body 10 surrounds the multiple energy storage cells 210 and the covering sheet 230.

[0052] The covering sheet 230 covers the plurality of power storage cells 210. Specifically, the covering sheet 230 covers the power storage cells 210 so as to collectively surround the plurality of power storage cells 210. The covering sheet 230 is made of an insulating material (synthetic resin, etc.).

[0053] The process of cutting the energy storage device 1 includes a first process of cutting the energy storage device 1 along the recesses 11 corresponding to the protrusions 214b (see FIG. 5) that connect the energy storage cells 210 and the external terminals 21, a second process of cutting the energy storage device 1 along the three recesses 11 that correspond to the connection portions 220 after the first process, and a third process of cutting the energy storage device 1 along the recesses 12 after the second process. The order of cutting is not limited to the above example.

[0054] As described above, in the energy storage device 1 of this embodiment, the outer surfaces (101, 102) of the case 100 are provided with recesses (11, 12) that indicate cutting portions of the case 100 to be cut when dismantling the energy storage device 1. This allows the energy storage device 1 to be cut using the recesses (11, 12) as indicators. As a result, the energy storage device 1 can be appropriately cut by cutting the energy storage device 1 along the recesses (11, 12) without specifying an appropriate cutting position of the energy storage device 1.

[0055] Furthermore, in the energy storage device 1 of this embodiment, the cutting portion of the case 100 indicated by the recesses (11, 12) includes a portion corresponding to the connection portion 220. As a result, by cutting the case 100 along the recesses (11, 12), it is possible to cut the connection portion 220 and separate the energy storage cells 210 from each other. This makes it possible to prevent the energy storage cells 210 themselves from being cut. As a result, the energy storage cells 210 can be easily recycled.

[0056] In the above embodiment, an example was shown in which the cut portion of the case 100 is indicated by the recesses (11, 12), but the present disclosure is not limited to this. The cut portion of the case may be indicated by something other than a recess.

[0057] For example, in the example shown in Fig. 10, the cut portion of case 300 is visually recognizable by line 311 and mark 312. Line 311 is drawn on outer surface 301 of case 300 so as to extend in the Z direction. Furthermore, multiple marks 312 (three in Fig. 10) are drawn on outer surface 301 so as to be aligned in the Z direction. At least one of line 311 and mark 312 may be drawn on an outer surface of case 300 other than outer surface 301.

[0058] 10 shows an example in which both the line 311 and the mark 312 are marked on the case 300, but only one of the line 311 and the mark 312 may be marked on the case 300. The shapes and arrangements of the line 311 and the mark 312 are not limited to the example shown in FIG. 10. The line 311 and the mark 312 may be marked with a pen or the like, or may be marked by discoloring metal or the like. Each of the line 311 and the mark 312 is an example of an "information providing unit" in the present disclosure.

[0059] 11, a protrusion 411 is formed on the outer surface 401 of the case 400, which visually indicates the cut portion of the case 400. The protrusion 411 is provided on the side surface 401a on which the outer surface 401 is provided, thereby forming a thin portion 411a. The thin portion 411a is a portion of the side surface 401a that is provided on the Y2 side (the inner surface side of the case body) of the protrusion 411. The protrusion 411 may be provided on an outer surface of the case 400 other than the outer surface 401. The thin portion 411a is an example of a "weak portion" in the present disclosure. The protrusion 411 is also an example of an "information providing portion" in the present disclosure.

[0060] The thin portion 411a has a thickness t21 in the Y direction. The thickness t21 of the thin portion 411a is smaller than a thickness t22 in the Y direction of a portion of the side surface 401a where the thin portion 411a is not provided. Note that the thin portion does not have to be formed at a position corresponding to the protrusion 411. Furthermore, both the recesses (11, 12) and the protrusion 411 of the above embodiment may be provided on the outer surface of the case.

[0061] 11, case 400 is cut at the position where protrusion 411 is provided, but the present disclosure is not limited to this. The portion between adjacent protrusions may also be cut. This feature may also be applied to the above embodiment and each of the modified examples.

[0062] 12, member 511 is attached to outer surface 501 of case 500, so that the cut portion of case 500 is visually recognizable. Member 511 may be, for example, a sticker, tape, or the like. Member 511 may also be attached to an outer surface of case 500 other than outer surface 501. Member 511 is an example of the "information providing unit" of the present disclosure.

[0063] In the example shown in FIG. 13 , code 611 is attached to outer surface 601 of case 600. Code 611 is, for example, a QR code (registered trademark). As shown in FIG. 13 , code 611 is imaged (read) by terminal 700 (for example, a smartphone, tablet, or the like), thereby making it possible to acquire information about the cut portion of case 600. Specifically, when code 611 is imaged (read) by terminal 700, position information about the cut portion of case 600 is displayed on screen 710 of terminal 700. The position information about the cut portion is displayed by an arrow on screen 710. Code 611 may be attached to an outer surface of case 600 other than outer surface 601. Code 611 and terminal 700 are examples of the "information providing unit" and "information acquisition device" of the present disclosure, respectively.

[0064] Although not shown, a through hole may be provided instead of the recess 11 (12) in the above embodiment. Resin or the like may be injected into the inside of the case through the through hole.

[0065] A winding key for use in opening a can or the like may also be provided at the cut portion of the case.

[0066] In the above embodiment, an example was shown in which the cut portions of the case 100 were thin-walled portions (11a, 12a), but the present disclosure is not limited to this. The cut portions may be knurled (processing to create fine irregularities or cuts in metal).

[0067] In the above embodiment, an example was shown in which a plurality of storage cells 210 were housed in the case 100, but the present disclosure is not limited to this. The number of storage cells housed in the case may be one.

[0068] In the above embodiment, an example was shown in which the case 100 has a sealed structure, but the present disclosure is not limited to this. The case 100 does not have to be sealed.

[0069] In the above embodiment, an example was shown in which the thin-walled portions (11a, 12a) were formed to provide weak portions in the case 100, but the present disclosure is not limited to this. The case does not necessarily have to be provided with weak portions.

[0070] In the above embodiment, an example was shown in which recesses were provided on each of outer surface 101 and outer surface 102, but the present disclosure is not limited to this. Recesses may be provided on only one of outer surface 101 and outer surface 102. Furthermore, recesses may be provided on an outer surface of case 100 other than outer surface 101 and outer surface 102.

[0071] The configurations of the above-described embodiment and the various modified examples may be combined with each other.

[0072] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not by the description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0073] 1 Energy storage device, 11, 12 Recess (information providing portion), 11a, 12a, 411a Thin portion (weak portion), 100, 300, 400, 500, 600 Case, 101, 102, 301, 401, 501, 601 Outer surface, 200 Energy storage module, 210 Energy storage cell, 220 Connection portion, 311 Wire (information providing portion), 312 Mark (information providing portion), 411 Convex portion (information providing portion), 511 Member (information providing portion), 611 Code (information providing portion), 700 Terminal (information acquisition device).

Claims

1. An electricity storage device, a storage module including at least one storage cell; a case that houses the power storage module, The power storage device, wherein an information providing section indicating a cutting section of the case to be cut when the power storage device is disassembled is provided on an outer surface of the case.

2. the at least one storage cell includes a plurality of storage cells; the power storage module includes a connection portion that connects different power storage cells among the plurality of power storage cells, The power storage device according to claim 1 , wherein the disconnecting portion is a portion corresponding to the connecting portion.

3. The power storage device according to claim 1 , wherein the case has a sealed structure.

4. The power storage device according to claim 1 , wherein the cut portion includes a weakened portion.

5. The power storage device according to claim 1 , wherein the information providing unit includes at least one of a line and a mark marked on the outer surface of the case to visually indicate the cut portion.

6. The power storage device according to claim 1 , wherein the information providing portion includes at least one of a recess and a protrusion formed on the outer surface of the case to visually indicate the cut portion.

7. The power storage device according to claim 1 , wherein the information providing unit includes a member attached to the outer surface of the case to visually indicate the cut portion.

8. The power storage device according to claim 1 , wherein the information providing unit includes a code from which information about the cut portion can be acquired by capturing an image of the code with an information acquisition device.

Images