Power storage device and method for manufacturing the same

Abstract

To provide a power storage device in which a cell module can be easily housed in a case.SOLUTION: A power storage device 1 includes a cell assembly 100 (cell module) including a plurality of power storage cells 110, and a case 200 that houses the cell assembly 100. An end 100a of the cell assembly 100 in the X direction (connecting direction) (longitudinal direction) is provided with a hole 114d (engagement portion) to which a hook 900 can be attached and detached.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to an electricity storage device and a method for manufacturing an electricity storage device. [Background technology]

[0002] JP 2023-502457 A (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. The plurality of electrode body sets are arranged in order along a first direction and connected in series. [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 multiple electrode sets arranged in a first direction are inserted into a housing along the first direction. In such cases, it is desirable to simplify the task of storing multiple electrode sets (cell modules) in a housing.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide an electricity storage device that allows a cell module to be easily housed in a case, and a method for manufacturing the electricity storage device. [Means for solving the problem]

[0006] A first aspect of the present disclosure provides an energy storage device including a cell module having a longitudinal direction and including at least one energy storage cell, and a case for housing the cell module. An engaging portion is provided at an end of the cell module in the longitudinal direction, to which a hook can be attached and detached.

[0007] In the energy storage device according to the first aspect of the present disclosure, as described above, an engagement portion to which a hook can be attached or detached is provided at an end of the cell module in the longitudinal direction. This allows the cell module to be easily moved in the longitudinal direction by pulling the hook in the longitudinal direction while the hook is engaged with the engagement portion. As a result, the cell module can be easily inserted into the case along the longitudinal direction. This allows the cell module to be easily stored in the case.

[0008] In the energy storage device according to the first aspect, the at least one energy storage cell preferably includes a plurality of energy storage cells, and the longitudinal direction is a connecting direction in which the plurality of energy storage cells are connected. With this configuration, the plurality of energy storage cells can be easily inserted into the case along the connecting direction.

[0009] In the energy storage device according to the first aspect, the at least one energy storage cell preferably has an electrode terminal, and the engagement portion includes a hole provided in the electrode terminal or an L-shaped or U-shaped protrusion provided at an end of the cell module. With this configuration, the hook can be easily engaged with the end of the cell module using the hole provided in the electrode terminal or the L-shaped or U-shaped protrusion.

[0010] In the energy storage device according to the first aspect, preferably, one longitudinal end of the case is open. The cell module includes a cover member disposed at the end. The cover member is configured to be joined to the one end of the case to close the one end. The engaging portion is provided on the cover member. The cover member has a dimension that allows it to pass through the case in the longitudinal direction. With this configuration, by pulling the hook in the longitudinal direction while the hook is engaged with the engaging portion of the cover member, the cover member can be moved in the longitudinal direction together with the at least one energy storage cell to pass through the case. As a result, by moving the cover member to one end of the case, the at least one energy storage cell can be stored in the case and the one end can be closed by the cover member.

[0011] A manufacturing method for a storage device according to a second aspect of the present disclosure is a manufacturing method for a storage device having a cell module including at least one storage cell and having a longitudinal direction, and includes the steps of engaging a hook with an engaging portion provided at an end of the cell module in the longitudinal direction, and inserting the cell module into a case by pulling the hook engaged with the engaging portion in the longitudinal direction.

[0012] In the manufacturing method for an energy storage device according to the second aspect of the present disclosure, as described above, the cell module is inserted into the case by pulling the hooks engaged with the engagement portions in the longitudinal direction, thereby providing a manufacturing method for an energy storage device that allows the cell module to be easily housed in the case. [Effects of the Invention]

[0013] According to the present disclosure, a cell module including at least one power storage cell can be easily housed in a case. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view showing the configuration of an electricity storage device according to a first embodiment. [Figure 2]2 is a diagram showing the configuration of a cell connected body in the electricity storage device according to the first embodiment. FIG. [Figure 3] FIG. 2 is a partially enlarged perspective view showing the internal structure of the electricity storage device according to the first embodiment. [Figure 4] 1 is an exploded perspective view showing the configuration of a storage cell in a storage device according to a first embodiment. FIG. [Figure 5] 4 is a partially enlarged perspective view showing a hole provided in a current collector terminal of an electricity storage cell in the electricity storage device according to the first embodiment. FIG. [Figure 6] FIG. 3 is a flowchart showing a method for manufacturing the electricity storage device according to the first embodiment. [Figure 7] 7 is a partially enlarged plan view showing a state in which the hook is engaged with the hole in step S1 of FIG. 6. FIG. [Figure 8] 7 is a cross-sectional view showing a state in which the cell connected body is being pulled in step S2 of FIG. 6. FIG. [Figure 9] 7 is a cross-sectional view showing a state in which the case is closed by the cover member in step S3 of FIG. 6. FIG. [Figure 10] FIG. 5 is a cross-sectional view showing the configuration of an electricity storage device according to a second embodiment. [Figure 11] FIG. 10 is a cross-sectional view showing a state in which a cell connected body is being pulled in the electricity storage device according to the second embodiment. [Figure 12] FIG. 10 is a cross-sectional view showing a state in which the case is closed by a cover member in the electricity storage device according to the second embodiment. [Figure 13] FIG. 10 is a cross-sectional view showing the configuration of an electricity storage device according to a modified example of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] 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.

[0016] [First embodiment] <Configuration of the power storage device> FIG. 1 is a perspective view schematically illustrating a power storage device 1 according to a first embodiment of the present disclosure. The power storage device 1 is a device for storing electric power for driving an electric vehicle (not shown), for example. 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, Y, and Z directions in this specification are directions that are perpendicular to one another. For example, the X and Y directions may correspond to the front-to-rear and left-to-right directions of the electric vehicle when the power storage device 1 is mounted on the electric vehicle, respectively. The Z direction may also be the vertical direction. The X direction is an example of the "coupling direction" and "longitudinal direction" in the present disclosure.

[0017] As shown in Fig. 1, the energy storage device 1 includes a cell connected body 100 and a case 200. The cell connected body 100 is housed in the case 200. The case 200 is made of, for example, aluminum. The cell connected body 100 is an example of a "cell module" of the present disclosure.

[0018] Case 200 is formed in the shape of a rectangular parallelepiped that is long in the X direction. Specifically, case 200 has a length L1 in the X direction and a length L2 in the Y direction. Length L1 is greater than length L2. Case 200 has a height H in the Z direction. Height H is smaller than length L1. Height H is greater than length L2. Note that the shape of case 200 (the relationship between the dimensions in each direction) is not limited to the above example.

[0019] As shown in FIG. 2 , the cell assembly 100 includes a plurality of storage cells 110. In the first embodiment, the number of storage cells 110 is eight. However, the number of storage cells 110 is not limited to eight. An example of each storage cell 110 is a lithium ion battery. Each storage cell 110 may be configured as a so-called all-solid-state battery including a solid electrolyte. Each of the plurality of storage cells 110 has a shape that is longer in the X direction than in the Y direction and that extends longer in the X direction than in the Z direction. Each of the plurality of storage cells 110 has a shape that extends longer in the Z direction than in the Y direction. The cell assembly 100 has a longitudinal direction in the X direction.

[0020] The eight storage cells 110 are electrically connected in series. Specifically, the eight storage cells 110 include a storage cell 110A, a storage cell 110B, a storage cell 110C, a storage cell 110D, a storage cell 110E, a storage cell 110F, a storage cell 110G, and a storage cell 110H. The storage cells 110A to 110D are arranged in the X direction. Specifically, the storage cell 110A, the storage cell 110B, the storage cell 110C, and the storage cell 110D are arranged in this order from the X2 side. The storage cells 110E to 110H are arranged in the X direction. Specifically, the storage cell 110E, the storage cell 110F, the storage cell 110G, and the storage cell 110H are arranged in this order from the X1 side.

[0021] The column of the power storage cells 110A to 110D and the column of the power storage cells 110E to 110H are adjacent to each other in the Y direction. Specifically, the power storage cell 110A and the power storage cell 110H are adjacent to each other in the Y direction. The power storage cell 110B and the power storage cell 110G are adjacent to each other in the Y direction. The power storage cell 110C and the power storage cell 110F are adjacent to each other in the Y direction. The power storage cell 110D and the power storage cell 110E are adjacent to each other in the Y direction.

[0022] The power storage cells 110A to 110D are electrically connected in series by the connection parts 120. The power storage cell 110D and the power storage cell 110E are electrically connected by the connection parts 120. The power storage cells 110E to 110H are electrically connected in series by the connection parts 120. The connection parts 120 that electrically connect the power storage cell 110D and the power storage cell 110E are bent in a U-shape. The other connection parts 120 are formed in a straight line.

[0023] 3, case 200 includes a case main body 210 and a cover member 220. Case main body 210 is formed in the shape of a rectangular tube that is long in the X direction.

[0024] An opening 210a is provided in the case 200 (case body 210). The opening 210a is provided at an end 210b on the X2 side of the case body 210. The cover member 220 is joined to the end 210b (opening 210a) of the case body 210 by welding or the like so as to close the end 210b. The end 210b is an example of "one end" in the present disclosure.

[0025] Fig. 4 is an exploded perspective view of the energy storage cell 110. Referring to Fig. 4 together with Fig. 3, each energy storage cell 110 has at least one electrode assembly 111, a spacer 112, a terminal member 113, a current collecting terminal 114, a cover 115, and a laminated outer casing 116 (Fig. 3). Note that the laminated outer casing 116 is not shown in Fig. 4. Also, the laminated outer casing 116 of the energy storage cell 110B and the laminated outer casing 116 of the energy storage cell 110G are not shown in Fig. 3.

[0026] In this example, the energy storage cell 110 includes two electrode bodies 111. However, the number of electrode bodies 111 is not limited to two. Each electrode body 111 is formed of 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 111 may also be formed of a laminate in which a positive electrode sheet and a negative electrode sheet are stacked 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 on top of each other. Each electrode body 111 is formed in a shape elongated in the X direction.

[0027] Each electrode body 111 has a coated portion 111a and an electrode tab 111b. The coated portion 111a 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 111b 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).

[0028] 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 such that its dimension in the Y direction gradually increases as it moves away from the coated portion 111a in the X direction.

[0029] The terminal members 113 are connected to the outer surfaces of the spacers 112 in the X direction. The terminal members 113 are made of a conductive material (metal such as copper or aluminum). The terminal members 113 are connected to a pair of electrode tabs 111b adjacent to each other in the Y direction.

[0030] The current collecting terminal 114 is connected to the terminal member 113. The current collecting terminal 114, which is electrically connected to the positive electrode tab 111b via the terminal member 113, is made of, for example, aluminum. The current collecting terminal 114, which is electrically connected to the negative electrode tab 111b via the terminal member 113, is made of, for example, copper. The current collecting terminal 114 has a connecting portion 114a and a protruding portion 114b. Of the eight power storage cells 110, only the power storage cells 110A and 110H have a current collecting terminal 114c instead of the current collecting terminal 114. The current collecting terminal 114c is a terminal electrically connected to the external terminal 221 (see FIG. 3). The current collecting terminal 114c is provided at the X2-side end of each of the power storage cell 110A and the power storage cell 110H. The current collecting terminal 114 is provided at the X1-side end of each of the power storage cell 110A and the power storage cell 110H. The current collecting terminal 114c is an example of the "electrode terminal" of the present disclosure.

[0031] The connection portion 114a is connected to the outer surface of the terminal member 113 in the X direction by welding or the like. The connection portion 114a is formed in a flat plate shape.

[0032] The protrusions 114b protrude outward in the X direction from the connection portions 114a. The protrusions 114b are formed in a flat plate shape. The energy storage cells 110 that are electrically connected to each other are electrically connected by connecting their protrusions 114b to each other. The protrusions 114b that are electrically connected to each other form the connection portions 120 (FIG. 3).

[0033] The cover 115 covers the end (electrode tab 111b) of the electrode body 111 in the X direction. The cover 115 is made of an insulating material (synthetic resin, etc.). The cover 115 is provided with a through hole 115a through which the protrusion 114b is inserted.

[0034] The laminated exterior body 116 (FIG. 3) houses the electrode assemblies 111, the spacer 112, the terminal member 113, a part of the current collecting terminal 114, and the cover 115. The laminated exterior body 116 is made of a laminated film.

[0035] The external terminal 221 (FIG. 3) is provided on the cover member 220. The external terminal 221 is electrically connected to the collector terminal 114c of the storage cell 110 (storage cells 110A and 110H) that is located closest to the cover member 220 among the multiple storage cells 110.

[0036] Here, as described above, the cell assembly 100 including the plurality of energy storage cells 110 arranged in the X direction is inserted into the case body 210 during manufacturing. It is desired to simplify the work of inserting the cell assembly 100 into the case body 210.

[0037] Therefore, in the first embodiment, as shown in FIG. 5, a hole 114d to which a hook 900 (see FIG. 7) can be attached and detached is provided at the end 100a of the cell connected body 100 in the X direction. Specifically, the hole 114d is provided in each of the current collector terminals 114c of the energy storage cell 110A and the energy storage cell 110H. The hole 114d is a through-hole that penetrates the current collector terminal 114c in the Y direction. Note that the direction in which the hole 114d penetrates is not limited to the above example. The hole 114d is an example of an "engagement portion" in the present disclosure.

[0038] The hole 114d is provided in the lower part of the collector terminal 114c. Specifically, the hole 114d is provided below the center of the collector terminal 114c in the Z direction. Note that below the center of the collector terminal 114c means below the center of the power storage cell 110A (110H) in the Z direction.

[0039] Although not shown, the hole 114d may be provided on the X1 side (closer to the power storage cell) of the collector terminal 114c relative to the center in the X direction. The position of the hole 114d in the collector terminal 114c is not limited to the above example.

[0040] <Method of manufacturing an electricity storage device> Next, a method for manufacturing the electricity storage device 1 will be described with reference to Fig. 6 to Fig. 9. The method for manufacturing the electricity storage device 1 is not limited to the example shown below, and may be modified as appropriate.

[0041] As shown in Fig. 6, in step S1, the hook 900 (see Fig. 7) is engaged with the hole 114d. In step S2, the cell assembly 100 is inserted into the case 200 (case body 210). In step S3, the end (opening) of the case body 210 is closed.

[0042] Fig. 7 is a diagram showing the process of step S1 in Fig. 6. As shown in Fig. 7, the hook 900 is engaged with the hole 114d formed in the current collector terminal 114c of each of the energy storage cell 110A and the energy storage cell 110H. The hook 900 is formed of, for example, an insulating member. Alternatively, the hook 900 may be formed of, for example, a metal member covered with insulating tape.

[0043] 8 is a diagram showing the process of step S2 in FIG. 6. As shown in FIG. 8, the cell assembly 100 is inserted into the case body 210 through the opening 210c on the opposite side from the opening 210a. The opening 210c is provided at the end 210d on the X1 side of the case body 210. For example, with the end 100a (FIG. 5) on the X2 side of the cell assembly 100 inserted into the case body 210 through the opening 210c, the hook 900 is pulled toward the X2 side (in the direction of the arrow in FIG. 8). As a result, the entire cell assembly 100 is inserted into the case body 210.

[0044] FIG. 9 is a diagram illustrating the process of step S3 in FIG. 6. As shown in FIG. 9, end 210b (opening 210a) of case body 210 is closed by cover member 220. Furthermore, end 210d (opening 210c) of case body 210 is closed by cover member 230. Cover members 220 and 230 are joined to the edge of opening 210a (end 210b) and the edge of opening 210c (end 210d), respectively, by, for example, welding. Cover member 220 is larger than opening 210a. Specifically, the width of cover member 220 is larger than the width of opening 210a in both the Y direction and the Z direction. Similarly, the width of cover member 230 is larger than the width of opening 210c in both the Y direction and the Z direction.

[0045] As described above, in the energy storage device 1 of the first embodiment, the end 100a of the cell assembly 100 in the X direction is provided with the hole 114d to which the hook 900 can be attached and detached. This allows the plurality of energy storage cells 110 (cell assembly 100) to be moved integrally in the X direction by pulling the hook 900 engaged with the hole 114d in the X direction. As a result, the cell assembly 100 can be easily inserted into the case 200.

[0046] [Second embodiment] Next, a second embodiment of the present disclosure will be described with reference to Figures 10 to 12. Unlike the first embodiment in which holes 114d (engagements) are formed in the collector terminals 114c of the energy storage cells 110, the second embodiment has an engagement portion provided in the cover member 320. The same components as those in the first embodiment are denoted by the same reference numerals and will not be described repeatedly.

[0047] <Configuration of the power storage device> 10, the energy storage device 2 includes a cell module 101a and a case 200a. The cell module 101a includes a cell connected body 101 and a cover member 320. The case 200a is composed of a case body 210 and a cover member 230.

[0048] The cell connected body 101 differs from the cell connected body 100 of the first embodiment in that it includes a storage cell 110I (FIG. 11) instead of the storage cell 110A of the first embodiment and a storage cell 110J (FIG. 11) instead of the storage cell 110H of the first embodiment. The storage cell 110I and the storage cell 110J are each arranged closest to the X2 side (closer to the end 101b of the cell module 101a) among the multiple storage cells 110. The storage cell 110I and the storage cell 110J each have the same configuration as the storage cells 110B to 110G.

[0049] The cover member 320 is joined (fixed) to the connected cell body 101 by welding or the like. Specifically, the cover member 320 is joined (fixed) to each of the energy storage cell 110I and the energy storage cell 110J. That is, the cover member 320 is provided at the end 101b on the X2 side of the cell module 101a. The cover member 320 may be joined directly to the connected cell body 101, or may be joined indirectly to the connected cell body 101 via another member.

[0050] The cover member 320 is joined to the end 210b of the case 200a (case body 210). The cover member 320 is provided so as to close the end 210b (opening 210a). In other words, the cover member 320, together with the case 200a, forms a storage space for the cell assembly 101.

[0051] The cover member 320 is provided with a protrusion 321. The protrusion 321 is provided on a surface 322 of the cover member 320 on the side opposite to the cell connected body 101 (X2 side). The protrusion 321 is provided integrally with the cover member 320. The protrusion 321 may be a separate member from the cover member 320. In this case, the protrusion 321 may be fastened to the cover member 320, for example. The protrusion 321 is formed of, for example, a metal (aluminum, etc.). The protrusion 321 is an example of an "engagement portion" in the present disclosure.

[0052] The protrusion 321 is provided so as to protrude from the surface 322 to the side (X2 side) opposite to the cell connected body 101. The external terminal 221 is also provided so as to protrude from the surface 322 to the X2 side.

[0053] 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.

[0054] In the Z direction, the protrusion 321 is disposed on the Z2 side (lower side) of the position where the external terminal 221 is provided. Note that the protrusion 321 may be disposed at a position other than the above.

[0055] In the second embodiment, the cover member 320 has a dimension that allows it to pass through the case 200a (case body 210) in the X direction. Specifically, the cover member 320 has a width W1 in the Z direction. The space S (the accommodation space for the cell assembly 101) within the case body 210 has a width W2 in the Z direction. The width W2 is equal to or greater than the width W1.

[0056] Additionally, the cover member 320 has a width W3 (FIG. 11) in the Y direction. The space S within the case main body 210 has a width W4 in the Y direction. The width W4 is equal to or greater than the width W3.

[0057] <Method of manufacturing an electricity storage device> Next, a method for manufacturing the electricity storage device 2 will be described with reference to Figures 11 and 12. The flow of the manufacturing method is similar to that of the first embodiment (Figure 6).

[0058] 11 is a diagram showing a step (corresponding to step S2 in the first embodiment) of inserting the cell module 101a into the case 200a (case body 210). As shown in Fig. 11, in the second embodiment, the plurality of energy storage cells 110 and the cover member 320 are inserted together into the case body 210 by pulling the hook 910 toward the X2 side while the hook 910 is engaged with the protrusion 321.

[0059] 12 is a diagram showing a step (corresponding to step S3 in the first embodiment) of closing an end (opening) of case body 210. As shown in Fig. 12, in the second embodiment, end 210b (opening 210a) is closed by cover member 320. At this time, in order to fill the gap between end 210b and cover member 320, welding may be performed using a metal plate (patch) having a shape (for example, an annular shape) corresponding to the gap.

[0060] The other configurations and processes are the same as those in the first embodiment, and therefore will not be described repeatedly.

[0061] In the second embodiment, an example was shown in which the U-shaped protrusion 321 was provided on the end 101b of the cell module 101a, but the present disclosure is not limited to this.The shape of the protrusion is not limited to a U-shape.

[0062] For example, in the example shown in FIG. 13 , an L-shaped protrusion 421 is provided on an end 101d of a cell module 101c included in the energy storage device 3. The protrusion 421 is provided on a 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. This makes it possible to prevent the hook from coming off the protrusion 421. Note that the other configurations are the same as those of the second embodiment. The protrusion 421 is an example of an "engagement portion" of the present disclosure.

[0063] In the first embodiment described above, an example has been shown in which the hole 114d into which the hook 900 engages is provided in the collector terminal 114c of the energy storage cell 110, but the present disclosure is not limited to this. For example, the hole may be provided in the cover member 220 that closes the end portion 210b (opening 210a). Alternatively, the hole may be provided in the external terminal 221 provided in the cover member 220. Alternatively, the collector terminal 114 or the external terminal 221 may be provided with a U-shaped or L-shaped protrusion.

[0064] Furthermore, for example, holes or the like for engaging hooks may be provided in laminate exterior body 116 (FIG. 3).

[0065] In the first embodiment, an example has been described in which the cell connected body 100 is pulled by the hook 900 from the side (X2 side) where the energy storage cell 110A and the energy storage cell 110H are provided, but the present disclosure is not limited to this. The cell connected body 100 may be pulled by the hook from the side (X1 side) where the energy storage cell 110D and the energy storage cell 110E are provided. For example, the hook may be engaged with an engaging portion (a groove, a hole, a concave-convex portion, or the like) provided in the connecting portion 120 that connects the energy storage cell 110D and the energy storage cell 110E.

[0066] In the second embodiment, the width W1 (FIG. 10) and width W3 (FIG. 11) of the cover member 320 are smaller than the widths W2 and W4 of the space S in the case 200a, respectively, so that the cover member 320 can pass through the case 200a. However, the present disclosure is not limited to this. For example, an elastically deformable cover member may be inserted into the case while being elastically deformed.

[0067] In the first and second embodiments, an example has been described in which the cell connected body 100 (101) includes a plurality of energy storage cells 110, but the present disclosure is not limited to this. For example, the number of energy storage cells provided in the energy storage device may be one. This one energy storage cell may be formed as a laminate in which a positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween.

[0068] The configurations of the above-described embodiment and the various modified examples may be combined with each other.

[0069] 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]

[0070] 1, 2, 3 Energy storage device, 100 Cell assembly (cell module), 101a, 101c Cell module, 100a, 101b, 101d End, 110 Energy storage cell, 114c Current collecting terminal (electrode terminal), 114d Hole (engagement portion), 200, 200a Case, 210a Opening, 210b End (one end), 320, 420 Cover member, 321, 421 Protrusion (engagement portion), 900, 910 Hook.

Claims

1. a cell module including at least one storage cell and having a longitudinal direction; a case that houses the cell module, An electric storage device, wherein an engaging portion to which a hook can be attached and detached is provided at an end of the cell module in the longitudinal direction.

2. the at least one storage cell includes a plurality of storage cells; The power storage device according to claim 1 , wherein the longitudinal direction is a direction in which the plurality of power storage cells are connected to each other.

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

4. One end of the case in the longitudinal direction is open, the cell module includes a cover member disposed at the end, the cover member is configured to close the one end of the case by being joined to the one end, The engaging portion is provided on the cover member, The power storage device according to claim 1 , wherein the cover member has a dimension that allows the cover member to pass through the case in the longitudinal direction.

5. A method for manufacturing an electricity storage device including a cell module including at least one electricity storage cell and having a longitudinal direction, the method comprising: a step of engaging a hook with an engaging portion provided at an end of the cell module in the longitudinal direction; and inserting the cell module into the case by pulling the hook engaged with the engagement portion in the longitudinal direction.

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