Power storage device and method for manufacturing power storage device

Abstract

The invention provides a power storage device and a method for manufacturing the power storage device. A power storage device is provided with an element connection body (element module) including a plurality of power storage elements, and a housing for housing the element connection body. A hole portion (engagement portion) through which the hook can be attached and detached is provided at an end portion of the element connection body in the X direction (connection direction) (longitudinal direction).

Description

Technical Field

[0001] The present disclosure relates to a power storage device and a method for manufacturing the power storage device. Background Art

[0002] Japanese Patent Application No. 2023-502457 discloses a battery comprising a housing and a plurality of electrode assembly assemblies. The plurality of electrode assembly assemblies are disposed within the housing. The plurality of electrode assembly assemblies are sequentially arranged along a first direction and connected in series. Summary of the Invention

[0003] Although not explicitly described in Japanese Patent Publication No. 2023-502457, multiple electrode assembly groups aligned in a first direction may be inserted into a case along the first direction. In this case, it is desirable to facilitate the work of housing the multiple electrode assembly groups (element modules) in the case.

[0004] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a power storage device and a method for manufacturing the power storage device, in which an element module can be easily housed in a casing.

[0005] A first aspect of the present disclosure provides an electric storage device comprising: an element module including at least one electric storage element and having a longitudinal direction; and a housing housing the element module. A hook-detachable engaging portion is provided at an end portion of the element module in the longitudinal direction.

[0006] In the power storage device according to the first aspect of the present disclosure, as described above, a hook-attachable engaging portion is provided at the end of the component module in the longitudinal direction. Thus, by pulling the hook in the longitudinal direction while it is engaged with the engaging portion, the component module can be easily moved in the longitudinal direction. As a result, the component module can be easily inserted into the housing along the longitudinal direction. This makes it easy to store the component module in the housing.

[0007] In the power storage device according to the first aspect, the at least one power storage element preferably includes a plurality of power storage elements. The longitudinal direction is a connection direction connecting the plurality of power storage elements. This configuration facilitates insertion of the plurality of power storage elements into the housing along the connection direction.

[0008] In the energy storage device according to the first aspect, preferably, the at least one energy storage element includes an electrode terminal. The engaging portion includes a hole provided in the electrode terminal or an L-shaped or U-shaped protrusion provided at the end of the element module. With this configuration, the hook can be easily engaged with the end of the element module using the hole provided in the electrode terminal or the L-shaped or U-shaped protrusion.

[0009] In the power storage device of the first aspect described above, it is preferred that one end of the housing in the longitudinal direction is open. The element module includes a cover member arranged at the above-mentioned end. The cover member is configured to close the one end by being engaged with one end of the housing. A snap-fit ​​portion is provided on the cover member. The cover member has a size that enables it to pass through the housing in the above-mentioned longitudinal direction. If configured in this way, by pulling the hook in the longitudinal direction while the hook is engaged with the snap-fit ​​portion of the cover member, the cover member can be moved in the longitudinal direction together with the above-mentioned at least one power storage element and passed through the housing. As a result, by moving the cover member to one end of the housing, the above-mentioned at least one power storage element can be accommodated in the housing and the one end can be closed by the cover member.

[0010] A second aspect of the present disclosure is a method for manufacturing an electrical storage device comprising an element module including at least one electrical storage element and having a longitudinal direction, the method comprising: a step of engaging a hook with an engaging portion provided at an end portion of the element module in the longitudinal direction; and a step of inserting the element module into a housing by pulling the hook engaged with the engaging portion in the longitudinal direction.

[0011] In the second aspect of the present disclosure, the method for manufacturing a power storage device inserts the element module into the case by pulling the hook engaged with the engaging portion in the longitudinal direction.

[0012] According to the present disclosure, an element module including at least one power storage element can be easily housed in a casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like numerals represent like elements, and in which:

[0014] Figure 1 is a perspective view showing the structure of the power storage device according to the first embodiment;

[0015] Figure 2 is a diagram showing the structure of an element connection body in the power storage device according to the first embodiment;

[0016] Figure 3 is a partially enlarged perspective view showing the internal structure of the power storage device according to the first embodiment;

[0017] Figure 4 is an exploded perspective view showing the structure of an electric storage element in the electric storage device according to the first embodiment;

[0018] Figure 5 This is a partially enlarged perspective view showing a hole portion in which a current collecting terminal of the storage element is provided in the storage device according to the first embodiment;

[0019] Figure 6 is a flowchart illustrating a method for manufacturing the power storage device according to the first embodiment;

[0020] Figure 7 It is shown in Figure 6 A partially enlarged top view of a state in which a hook is engaged in the hole portion in step S1;

[0021] Figure 8 It is shown in Figure 6 A cross-sectional view showing a state in which the element connection body is pulled in step S2;

[0022] Figure 9 It is shown in Figure 6 A sectional view showing a state in which the housing is closed by the cover member in step S3;

[0023] Figure 10 is a cross-sectional view showing the structure of the power storage device according to the second embodiment;

[0024] Figure 11 is a cross-sectional view showing a state in which an element coupling body is pulled in the power storage device according to the second embodiment;

[0025] Figure 12 is a cross-sectional view showing a state in which the outer casing of the power storage device according to the second embodiment is closed by a cover member;

[0026] Figure 13 It is a cross-sectional view showing the structure of a power storage device according to a modification of the second embodiment. DETAILED DESCRIPTION

[0027] The embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that, in the drawings referred to below, the same or corresponding components are denoted by the same reference numerals.

[0028] [First embodiment]

[0029] <Structure of Power Storage Device>

[0030] Figure 1It is a stereoscopic diagram schematically showing the power storage device 1 in the first 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). It should be noted that the power storage device 1 can also be provided in an electrical device other than an electric vehicle (for example, a mounted power storage device). It should be noted that the X direction, Y direction, and Z direction in this specification are directions orthogonal to each other. For example, the X direction and the Y direction can be the front-to-back direction and the left-to-right direction of the electric vehicle, respectively, when the power storage device 1 is mounted on the electric vehicle. In addition, the Z direction can be a vertical direction. It should be noted that the X direction is an example of the "connection direction" and the "long side direction" of the present disclosure.

[0031] like Figure 1 As shown, the power storage device 1 includes an element connection body 100 and a case 200. The element connection body 100 is housed in the case 200. The case 200 is formed of, for example, aluminum. It should be noted that the element connection body 100 is an example of a "element module" in the present disclosure.

[0032] The housing 200 is formed into a rectangular parallelepiped shape that is elongated in the X-direction. Specifically, the housing 200 has a length L1 in the X-direction and a length L2 in the Y-direction. Length L1 is greater than length L2. The housing 200 has a height H in the Z-direction. Height H is less than length L1 and greater than length L2. It should be noted that the shape of the housing 200 (the relationship between its dimensions in various directions) is not limited to the above example.

[0033] like Figure 2 As shown, the element assembly 100 includes a plurality of energy storage elements 110. In the first embodiment, the number of energy storage elements 110 is 8. However, the number of energy storage elements 110 is not limited to 8. As each energy storage element 110, for example, a lithium-ion battery can be cited. Each energy storage element 110 can also be composed of a so-called all-solid-state battery containing a solid electrolyte. It should be noted that each of the plurality of energy storage elements 110 has a shape that is longer in the X direction than in the Y direction and extends longer in the X direction than in the Z direction. In addition, each of the plurality of energy storage elements 110 has a shape that extends longer in the Z direction than in the Y direction. The element assembly 100 has a long side direction in the X direction.

[0034] Eight energy storage elements 110 are electrically connected in series. Specifically, the eight energy storage elements 110 include energy storage element 110A, energy storage element 110B, energy storage element 110C, energy storage element 110D, energy storage element 110E, energy storage element 110F, energy storage element 110G, and energy storage element 110H. Energy storage elements 110A to 110D are arranged in the X direction. Specifically, from the X2 side, they are arranged in the order of energy storage element 110A, energy storage element 110B, energy storage element 110C, and energy storage element 110D. Energy storage elements 110E to 110H are arranged in the X direction. Specifically, from the X1 side, they are arranged in the order of energy storage element 110E, energy storage element 110F, energy storage element 110G, and energy storage element 110H.

[0035] The row of energy storage elements 110A to 110D and the row of energy storage elements 110E to 110H are adjacent in the Y direction. Specifically, energy storage element 110A and energy storage element 110H are adjacent in the Y direction. Energy storage element 110B and energy storage element 110G are adjacent in the Y direction. Energy storage element 110C and energy storage element 110F are adjacent in the Y direction. Energy storage element 110D and energy storage element 110E are adjacent in the Y direction.

[0036] Energy storage elements 110A to 110D are electrically connected in series by a connection portion 120. Energy storage element 110D and energy storage element 110E are electrically connected by a connection portion 120. Energy storage elements 110E to 110H are electrically connected in series by a connection portion 120. It should be noted that the connection portion 120 electrically connecting energy storage element 110D and energy storage element 110E is bent into a U-shape. The other connection portions 120 are formed in a straight line.

[0037] Reference Figure 3 The housing 200 includes a housing body 210 and a cover member 220. The housing body 210 is formed in a rectangular cylindrical shape that is long in the X direction.

[0038] The housing 200 (housing body 210) is provided with an opening 210a. The opening 210a is provided at the end 210b on the X2 side of the housing body 210. The cover member 220 is joined to the end 210b by welding or the like to close the end 210b (opening 210a) of the housing body 210. It should be noted that the end 210b is an example of "one end" in this disclosure.

[0039] Figure 4 This is an exploded perspective view of the storage element 110. Figure 3 and Figure 4 Each storage element 110 includes at least one electrode body 111, a separator 112, a terminal member 113, a collector terminal 114, a cover 115, and a laminated outer body 116 ( Figure 3 ). It should be noted that Figure 4 In FIG, the laminated outer casing 116 is omitted. Figure 3 In FIG, the laminated outer casing 116 of the energy storage element 110B and the laminated outer casing 116 of the energy storage element 110G are omitted from illustration.

[0040] In this example, the storage element 110 includes two electrode bodies 111. However, the number of electrode bodies 111 is not limited to two. Each electrode body 111 is composed of a wound body formed by winding a positive electrode sheet and a negative electrode sheet with a separator interposed therebetween. However, each electrode body 111 may also be composed of a stacked body formed by stacking a positive electrode sheet and a negative electrode sheet with a separator interposed therebetween. The two electrode bodies 111 are adjacent to each other in the Y direction in which the positive electrode sheet and the negative electrode sheet are stacked. Each electrode body 111 is formed into a shape that is elongated in the X direction.

[0041] Each electrode body 111 includes a coated portion 111a and an electrode tab 111b. The coated portion 111a is the area of ​​the electrode foil of the positive or negative electrode sheet where the active material layer is provided. The electrode tab 111b is the area of ​​the electrode foil of the positive or negative electrode sheet where the active material layer is not provided (i.e., the uncoated portion of the electrode foil where it is exposed).

[0042] The spacer 112 is disposed between a pair of adjacent electrode tabs 111b. The spacer 112 is made of an insulating material (synthetic resin, etc.). The spacer 112 has a shape in which the size in the Y direction gradually increases as the distance from the coating portion 111a in the X direction increases.

[0043] The terminal member 113 is connected to the outer side surface of the spacer 112 in the X direction. The terminal member 113 is made of a conductive material (metal such as copper or aluminum) and is connected to a pair of electrode tabs 111b adjacent to each other in the Y direction.

[0044] The collector terminal 114 is connected to the terminal member 113. The collector terminal 114 electrically connected to the positive electrode tab 111b via the terminal member 113 is made of, for example, aluminum. The collector terminal 114 electrically connected to the negative electrode tab 111b via the terminal member 113 is made of, for example, copper. The collector terminal 114 has a connecting portion 114a and a protruding portion 114b. It should be noted that, among the eight storage elements 110, only the storage elements 110A and 110H have a collector terminal 114c instead of the collector terminal 114. The collector terminal 114c is connected to the external terminal 221 (see Figure 3 ) terminals for electrical connection. The collector terminal 114c is provided at the X2-side end of each of the energy storage element 110A and the energy storage element 110H. Note that the collector terminal 114 is provided at the X1-side end of each of the energy storage element 110A and the energy storage element 110H. The collector terminal 114c is an example of an "electrode terminal" in this disclosure.

[0045] The connection portion 114a is connected to the outer side surface in the X direction of the terminal member 113 by welding or the like. The connection portion 114a is formed in a flat plate shape.

[0046] The protrusion 114b protrudes outward from the connection portion 114a in the X direction. The protrusion 114b is formed in a flat plate shape. The mutually electrically connected storage elements 110 are electrically connected by being connected to each other through their respective protrusions 114b. The connection portion 120 ( Figure 3 ).

[0047] The cover 115 covers the X-direction end portion (electrode tab 111 b ) of the electrode body 111 . The cover 115 is made of an insulating material (synthetic resin, etc.) and is provided with a through-hole 115 a through which the protrusion 114 b is inserted.

[0048] Laminated outer body 116 ( Figure 3 ) accommodates each electrode body 111, the separator 112, the terminal member 113, a part of the collector terminal 114 and the cover 115. The laminated outer package 116 is composed of a laminate film.

[0049] External terminal 221( Figure 3 ) is provided on the cover member 220. The external terminal 221 is electrically connected to the collector terminal 114c of the storage element 110 (the storage elements 110A and 110H) that is arranged closest to the cover member 220 among the plurality of storage elements 110.

[0050] Here, as described above, the element connection body 100 including the plurality of power storage elements 110 arranged in the X direction is inserted into the case body 210 during manufacturing. It is desirable to facilitate the operation of inserting the element connection body 100 into the case body 210.

[0051] Therefore, in the first embodiment, if Figure 5 As shown, a hook 900 (see FIG. 1 ) is provided at the end 100a in the X direction of the component connection body 100. Figure 7 ) is provided in a hole 114d for attachment and detachment. Specifically, hole 114d is provided in each of current collector terminals 114c of storage element 110A and storage element 110H. Hole 114d is a through-hole extending through current collector terminal 114c in the Y direction. It should be noted that the direction in which hole 114d extends is not limited to the example described above. Furthermore, hole 114d is an example of a "locking portion" as used herein.

[0052] Hole 114d is provided below collector terminal 114c. Specifically, hole 114d is provided below the center of collector terminal 114c in the Z direction. Note that "below the center of collector terminal 114c" refers to below the center of storage element 110A (110H) in the Z direction.

[0053] Although not shown, the hole 114d may be provided on the X1 side (ie, closer to the storage element) than the center of the collector terminal 114c in the X direction.

[0054] <Method for Manufacturing Electricity Storage Device>

[0055] Next, refer to Figures 6 to 9 Next, a method for manufacturing the electricity storage device 1 will be described. Note that the method for manufacturing the electricity storage device 1 is not limited to the example shown below, and can be modified as appropriate.

[0056] like Figure 6 As shown, in step S1, the hook 900 (refer to Figure 7 ) is engaged with the hole portion 114d. In step S2, the element connection body 100 is inserted into the housing 200 (housing body 210). In step S3, the end portion (opening) of the housing body 210 is closed.

[0057] Figure 7 It shows Figure 6 FIG step S1 of the process. Figure 7 As shown, hook 900 engages with hole 114d formed in collector terminal 114c of each of storage element 110A and storage element 110H. Note that hook 900 is formed of, for example, an insulating member. Alternatively, hook 900 may be formed of, for example, a metal member coated with insulating tape.

[0058] Figure 8 It shows Figure 6 FIG step S2 of the process. Figure 8 As shown, the component connection body 100 is inserted from the opening 210c on the opposite side of the opening 210a of the housing body 210. The opening 210c is provided at the end 210d on the X1 side of the housing body 210. For example, at the end 100a ( Figure 5 ) is inserted into the housing body 210 from the opening 210c, and then moves to the X2 side ( Figure 8 The hook 900 is pulled (in the direction of the arrow). As a result, the entire component connection body 100 is inserted into the housing body 210.

[0059] Figure 9 It shows Figure 6 FIG step S3 of the process. Figure 9 As shown, the end 210b (opening 210a) of the housing body 210 is closed by the cover member 220. In addition, the end 210d (opening 210c) of the housing body 210 is closed by the cover member 230. The cover member 220 and the cover member 230 are respectively joined to the edge of the opening 210a (end 210b) and the edge of the opening 210c (end 210d) by, for example, welding. It should be noted that the cover member 220 is larger than the opening 210a. Specifically, in the Y direction and the Z direction, the size of the cover member 220 is larger than the size of the opening 210a. Similarly, in the Y direction and the Z direction, the size of the cover member 230 is larger than the size of the opening 210c.

[0060] As described above, in the energy storage device 1 according to the first embodiment, the end portion 100a in the X direction of the element connection body 100 is provided with a hole 114d through which the hook 900 can be attached and detached. Thus, by pulling the hook 900 engaged in the hole 114d in the X direction, the plurality of energy storage elements 110 (element connection body 100) can be moved integrally in the X direction. As a result, the element connection body 100 can be easily inserted into the housing 200.

[0061] [Second embodiment]

[0062] Next, refer to Figures 10 to 12 The second embodiment of the present disclosure will now be described. Unlike the first embodiment described above, in which a hole 114d (engaging portion) is formed in the collector terminal 114c of the energy storage element 110, the second embodiment includes an engaging portion in the cover member 320. Components identical to those in the first embodiment are denoted by the same reference numerals, and descriptions thereof will not be repeated.

[0063] <Structure of Power Storage Device>

[0064] like Figure 10 As shown, the power storage device 2 includes an element module 101 a and a case 200 a. The element module 101 a includes an element connection body 101 and a cover member 320. The case 200 a includes a case body 210 and a cover member 230.

[0065] The element connection body 101 includes the storage element 110I ( Figure 11 ) instead of the energy storage element 110A of the first embodiment and including an energy storage element 110J ( Figure 11) instead of the energy storage element 110H of the first embodiment. The energy storage element 110I and the energy storage element 110J are each located closest to the X2 side (toward the end 101b of the element module 101a) among the plurality of energy storage elements 110. It should be noted that the energy storage elements 110I and 110J have the same structure as the energy storage elements 110B to 110G.

[0066] The cover member 320 is joined (fixed) to the element assembly 101 by welding or other means. Specifically, the cover member 320 is joined (fixed) to each of the energy storage element 110I and the energy storage element 110J. That is, the cover member 320 is provided at the X2-side end 101b of the element module 101a. It should be noted that the cover member 320 may be directly joined to the element assembly 101 or indirectly joined to the element assembly 101 via another member.

[0067] The cover member 320 is joined to the end portion 210b of the housing 200a (housing body 210). The cover member 320 is provided to close the end portion 210b (opening 210a). That is, the cover member 320 and the housing 200a together form a housing space for the component connection body 101.

[0068] A protrusion 321 is provided on the cover member 320. The protrusion 321 is provided on a surface 322 of the cover member 320 on the side opposite to the element connector 101 (X2 side). The protrusion 321 is provided integrally with the cover member 320. It should be noted that the protrusion 321 may also be separate from the cover member 320. In this case, the protrusion 321 may be fastened to the cover member 320, for example. It should be noted that the protrusion 321 is formed of, for example, metal (aluminum, etc.). In addition, the protrusion 321 is an example of a "locking portion" disclosed in the present invention.

[0069] The protrusion 321 is provided so as to protrude from the surface 322 toward the side (X2 side) opposite to the element connection body 101. In addition, the external terminal 221 is also provided so as to protrude from the surface 322 toward the X2 side.

[0070] The protrusion 321 has a U-shape (or a J-shape). Specifically, the protrusion 321 has a U-shape with the X2 side facing downward.

[0071] The protrusion 321 is arranged on the Z2 side (downward side) of the position where the external terminal 221 is provided in the Z direction. It should be noted that the arrangement position of the protrusion 321 may be a position other than the above-mentioned position.

[0072] In the second embodiment, the cover member 320 has dimensions that allow it to pass through the housing 200a (housing body 210) in the X direction. Specifically, the cover member 320 has a dimension W1 in the Z direction. The space S within the housing body 210 (the space housing the component assembly 101) has a dimension W2 in the Z direction. Dimension W2 is greater than dimension W1.

[0073] In addition, the cover member 320 has a dimension W3 ( Figure 11 The space S in the housing body 210 has a dimension W4 in the Y direction. The dimension W4 is greater than or equal to the dimension W3.

[0074] <Method for Manufacturing Electricity Storage Device>

[0075] Next, refer to Figure 11 and Figure 12 The manufacturing method of the power storage device 2 is described below. The manufacturing method has the same flow as the first embodiment ( Figure 6 ) is the same.

[0076] Figure 11 1 is a diagram showing a process of inserting the element module 101a into the housing 200a (housing body 210) (equivalent to step S2 of the first embodiment described above). Figure 11 As shown, in the second embodiment, by pulling the hook 910 toward the X2 side while the hook 910 is engaged with the protrusion 321 , the plurality of power storage elements 110 and the cover member 320 are integrally inserted into the case body 210 .

[0077] Figure 12 1 is a diagram showing a process of closing the end portion (opening) of the housing body 210 (equivalent to step S3 of the first embodiment described above). Figure 12 As shown, in the second embodiment, the end portion 210b (opening 210a) is closed by the cover member 320. In this case, a metal plate (repairing member) having a shape corresponding to the gap (e.g., annular shape) may be welded to fill the gap between the end portion 210b and the cover member 320.

[0078] It should be noted that other configurations and processes are the same as those of the first embodiment, and therefore description thereof will not be repeated.

[0079] In the second embodiment described above, an example is shown in which the U-shaped protrusion 321 is provided on the end portion 101b of the element module 101a, but the present disclosure is not limited thereto. The shape of the protrusion is not limited to the U-shape.

[0080] For example, in Figure 13In the example shown, an L-shaped protrusion 421 is provided at the end 101d of the element module 101c provided in the power storage device 3. The protrusion 421 is provided on the cover member 420. The protrusion 421 has a portion 421a and a portion 421b. The portion 421a extends in the X direction. The portion 421b extends in the Z direction. The portion 421a has a length L11 in the X direction. The portion 421b has a length L12 in the Z direction. The length L12 is greater than the length L11. Thus, it is possible to prevent the hook from falling off the protrusion 421. It should be noted that the other structures are the same as those in the second embodiment described above. In addition, the protrusion 421 is an example of a "locking portion" disclosed in the present invention.

[0081] In the first embodiment described above, the collector terminal 114c of the energy storage element 110 is provided with a hole 114d for engaging the hook 900. However, the present disclosure is not limited thereto. For example, a hole may be provided in the cover member 220 at the closed end 210b (opening 210a). Alternatively, a hole may be provided in the external terminal 221 provided on the cover member 220. Furthermore, a U-shaped or L-shaped protrusion may be provided on the collector terminal 114 or the external terminal 221.

[0082] Alternatively, for example, the outer casing 116 ( Figure 3 ) is provided with a hole for hook engagement, etc.

[0083] While the first embodiment described above illustrates an example in which the element coupling assembly 100 is pulled using the hook 900 from the side (the X2 side) where the energy storage elements 110A and 110H are located, the present disclosure is not limited thereto. The element coupling assembly 100 may also be pulled using the hook from the side (the X1 side) where the energy storage elements 110D and 110E are located. For example, the hook may be engaged with an engaging portion (a groove, a hole, a concave-convex portion, etc.) provided in the connection portion 120 connecting the energy storage elements 110D and 110E.

[0084] In the second embodiment described above, the size W1 ( Figure 10 ) and size W3( Figure 11 ) are smaller than the size W2 and the size W4 of the space S in the housing 200a so that the cover member 320 can pass through the housing 200a, but the present disclosure is not limited thereto. For example, the elastically deformable cover member may be inserted into the housing while being elastically deformed.

[0085] In the first and second embodiments described above, the element assembly 100 (101) includes a plurality of energy storage elements 110. However, the present disclosure is not limited thereto. For example, the number of energy storage elements included in the energy storage device may be one. This single energy storage element may be composed of a stack of positive and negative electrode sheets stacked with a separator interposed therebetween.

[0086] It should be noted that the structures of the above-mentioned embodiment and various modified examples may be combined with each other.

[0087] The embodiments disclosed herein are to be considered in all respects as illustrative and non-restrictive. The scope of the present disclosure is indicated by the claims rather than the above description of the embodiments, and is intended to include all modifications within the meaning and scope equivalent to the claims.

Claims

1. A power storage device comprising: an element module including at least one power storage element and having a long side direction; and a housing for accommodating the component module; An engaging portion that can be attached or detached by a hook is provided at an end portion of the element module in the longitudinal direction.

2. The power storage device according to claim 1, The at least one storage element includes a plurality of storage elements, The longitudinal direction is a connection direction connecting the plurality of power storage elements.

3. The power storage device according to claim 1 or 2, The at least one storage element has an electrode terminal, The engaging portion includes a hole provided in the electrode terminal, or an L-shaped or U-shaped protrusion provided at the end portion of the element module.

4. The power storage device according to claim 1 or 2, One end of the housing in the longitudinal direction is open. The element module includes a cover member arranged at the end portion, The cover member is configured to close the one end by being joined to the one end of the housing. The engaging portion is provided on the cover member, The cover member has a size capable of passing through the housing in the longitudinal direction.

5. A method for manufacturing an electric storage device comprising an element module including at least one electric storage element and having a longitudinal direction, wherein: The manufacturing method comprises: a step of engaging a hook with an engaging portion provided at an end portion in the longitudinal direction of the element module; and and inserting the element module into the housing by pulling the hook engaged with the engaging portion in the longitudinal direction.

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