Electricity storage device

Abstract

The invention provides a power storage device. The battery includes: a cell array including a plurality of cells and a connection portion providing an electrical connection between adjacent ones of the cells; and a housing accommodating the cell array. The housing includes a housing body in which the cell array is clamped and held. In a cross section of the housing body, an opening portion that opens in a predetermined direction (-Z direction) is provided.

Description

Technical Field

[0001] The present disclosure relates to a power storage device. Background Art

[0002] Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2023-502457 discloses a rectangular parallelepiped battery (electricity storage device) in which the length L is 400 mm to 2500 mm and the ratio (L / H) of the length L to the width H is 4 to 21. Summary of the Invention

[0003] For the power storage device as described above, improvement in productivity is also required, such as assemblability of assembling a cell into a case and joining of the case.

[0004] The present disclosure has been devised to solve the above-mentioned problems, and an object of the present disclosure is to provide a power storage device with improved productivity.

[0005] According to one aspect of the present disclosure, a power storage device includes a cell array and a housing that houses the cell array. The cell array includes a plurality of cells and a connection portion that provides electrical connection between adjacent cells. The housing includes a first member, and the cell array is clamped and retained within the first member. The first member has an opening formed in a cross section that opens in a predetermined direction.

[0006] This allows the cell array to be assembled from the opening of the first member of the housing. This makes it easier to assemble the cell array into the housing, compared to inserting the cell array from the end of the tubular housing. This improves the productivity of the power storage device.

[0007] In one embodiment, the first member may include, in a cross section, two wall surfaces facing each other, a connecting portion connecting the ends of the two wall surfaces, and an opening. A recessed portion may be provided on each of the two wall surfaces, the recessed portion being configured to protrude toward the facing wall surface and having a bottom surface that contacts the cell array.

[0008] By doing so, the first member can hold the cell array since the bottom surfaces of the recesses provided on the two facing wall surfaces sandwich the cells by assembling the cell array with the first member.

[0009] Furthermore, in one embodiment, the housing may include a second member closing an opening of the first member to constitute the tubular body, a third member configured to close one end of the tubular body, and a fourth member configured to close the other end of the tubular body.

[0010] By doing so, the entire periphery of the cell array can be covered by the case by closing the opening portion using the second member, the third member, and the fourth member in a state where the cell array is assembled with the first member.

[0011] Furthermore, one embodiment may include: a cell array and a housing for accommodating the cell array, the cell array including a plurality of cells and connectors providing electrical connections between adjacent cells. The housing may include a tubular body surrounding the outer periphery of a surface of the cell array, the surface being arranged along a longitudinal direction. The tubular body may be constructed by folding a plate-like member to provide a wall surface facing each surface of the cell array along the longitudinal direction, and connecting one end of the plate-like member to a member on the other end side of the plate-like member.

[0012] By doing so, since the tubular body can be constructed by connecting the one end to the member on the other end side, the increase in the number of connection locations can be limited, and connection can be performed without affecting the cell array (for example, when the connection location of the one end to the member on the other end side is set to a position separated from the cell array). Therefore, the productivity of the power storage device can be improved.

[0013] According to the present disclosure, a power storage device with improved productivity can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, wherein like symbols represent like elements, and wherein:

[0015] Figure 1 shows a plurality of views illustrating an example of the configuration of a battery which is the power storage device according to the present embodiment;

[0016] Figure 2 is a perspective view with an enlarged Figure 1 The monomer array shown;

[0017] Figure 3 is included in Figure 1 an exploded perspective view of a cell in the illustrated array of cells;

[0018] Figure 4 is a diagram showing an example of the configuration of a case of a battery as the power storage device according to the present embodiment;

[0019] Figure 5 It is along Figure 1 A cross-sectional view taken along line VV in FIG; and

[0020] Figure 6There are shown a plurality of views illustrating an example of the configuration of a battery that is a power storage device according to one modification. DETAILED DESCRIPTION

[0021] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that identical or corresponding parts in the drawings are given the same symbols, and their descriptions will not be repeated. In the drawings used below, among the X-axis, Y-axis, and Z-axis that are perpendicular to each other, the X-axis represents a first in-plane direction (e.g., length direction) of the battery, the Y-axis represents a second in-plane direction (e.g., width direction) of the battery, and the Z-axis represents a height direction of the battery. Hereinafter, the directions indicated by the arrows of the X-axis, Y-axis, and Z-axis are given "+", and the opposite directions are given "-".

[0022] Figure 1 1 and 2 show a plurality of views showing an example of the configuration of a battery 100 which is a power storage device according to the present embodiment. Figure 1 In the "shell internal structure view -Z" is a view of the shell contents viewed from the +Z side. Figure 1 , "Shell Internal Structure View -Y" is a view of the shell contents viewed from the +Y side.

[0023] For example, battery 100 is a secondary battery, such as a lithium-ion battery, a nickel-metal hydride battery, or a sodium-ion battery. Examples of lithium-ion batteries include LFP batteries, in which lithium iron phosphate is used as the positive electrode active material, or ternary batteries, in which nickel, manganese, and cobalt (NMC) are used as the positive electrode active material. Secondary batteries can be either liquid-type secondary batteries or all-solid-state secondary batteries. As will be detailed later, battery 100 includes a plurality of cells, each of which functions as a secondary battery. Battery 100 can include only cells of the same type (e.g., only LFP cells), or it can include cells of different types (e.g., LFP cells and ternary cells).

[0024] The battery 100 includes a housing 300. The housing 300 has an outer shape of a rectangular parallelepiped. The housing 300 has a pair of surfaces F1 and F2 facing each other in the Z direction (first facing surfaces), a pair of surfaces F3 and F4 facing each other in the Y direction (second facing surfaces), and surfaces F5 and F6 located at the ends in the X direction (end surfaces in the X direction). The areas of surfaces F1 and F2 are smaller than those of surfaces F3 and F4. The length of the housing 300 (the dimension in the X direction) is greater than the width of the housing 300 (the dimension in the Y direction). The length of the housing 300 can be no less than 250 mm and no more than 5000 mm, and for example, is approximately 1000 mm. The width of the housing 300 can be no less than 10 mm and no more than 1250 mm, and for example, is approximately 50 mm. The ratio of the length of the housing 300 to its width can be no less than 4 and no more than 25. The height (dimension in the Z direction) of the housing 300 may be not less than 10 mm and not more than 1250 mm, and is, for example, approximately 100 mm. Note that the dimensions of the housing 300 are not limited to the above dimensions.

[0025] The housing 300 includes a housing body 310, a first cover body 320, a second cover body 330, and a bottom 340. The housing body 310 is a housing having openings at, for example, the ends in the +X direction, the -X direction, and the -Z direction. The openings at the ends of the housing body 310 in the -Z direction are closed by the bottom 340, forming a tubular body, and the cell arrays 10 and 20 are housed within the tubular body.

[0026] The first cover body 320 is a plate-like member (cover member) having an outer shape corresponding to the opening at the end of the housing body 310 in the +X direction, and closes the relevant opening. The second cover body 330 is a plate-like member (cover member) having an outer shape corresponding to the opening at the end of the housing body 310 in the -X direction, and closes the relevant opening.

[0027] The housing body 310, the first cover body 320, the second cover body 330, and the bottom 340 can be formed of the same material, or can be formed of different materials. For the material of each of the housing body 310, the first cover body 320, the second cover body 330, and the bottom 340, metal, for example, can be used. The housing 300 can be an aluminum housing. Note that these materials can be modified as appropriate. For example, at least any one of the first cover body 320, the second cover body 330, and the bottom 340 can be formed of an insulating material.

[0028] The cell array 10 includes four cells 11 to 14 capable of storing electricity and three connecting portions 2A, each of which provides electrical connection between adjacent cells. In the housing 300, the cells 11 to 14 are connected in a row along the X direction.

[0029] The cell array 20 includes four cells 21 to 24 capable of performing power storage, and three connection portions 2B each providing electrical connection between adjacent cells. In the housing 300 , the cells 21 to 24 are connected in a row along the X direction.

[0030] As described above, cell arrays 10 and 20 are arranged in parallel along the X-direction. Each of surfaces F1 to F4 of housing 300 has a shape extending along the direction (X-direction) in which cell arrays 10 and 20 are joined. Surfaces F5 and F6 of housing 300 cover respective ends of cell arrays 10 and 20 in the X-direction.

[0031] In the housing 300 of the battery 100, the cell array 10 and the cell array 20 are electrically connected. Figure 1 As shown, in the housing 300, the end portion (cell 14) of the cell array 10 in the -X direction and the end portion (cell 24) of the cell array 20 in the -X direction are electrically connected, for example, via a U-shaped connecting portion 2C. The connecting portion 2C has substantially the same structure as the connecting portion 2A or 2B, except that the connecting portion 2C is formed to have a shape different from that of the connecting portions 2A, 2B (each of the connecting portions 2A, 2B has an I-shaped cross section, while the connecting portion 2C has a U-shaped cross section). The connecting portion 2C may be an integrally molded article, or may be a composite of a plurality of separately molded parts. For example, the connecting portion 2C may be formed by connecting the protrusion 144B (protruding from the cell 14) via a conductive material (beam member) to the protrusion 144B ( Figure 3 ) and the protrusion 144B protruding from the monomer 24 ( Figure 3 It is worth noting that the protrusion 144B will be mentioned later.

[0032] Monomer arrays 10 and 20 are arranged so that the positions of the monomers and the positions of the connectors are aligned. Monomers 11, 12, 13, and 14 included in monomer array 10 are arranged at positions facing monomers 21, 22, 23, and 24 included in monomer array 20, respectively.

[0033] The end portion (cell 11 ) of the cell array 10 in the +X direction is connected to the first cover body 320 via the connection terminal T1 . The end portion (cell 21 ) of the cell array 20 in the +X direction is connected to the first cover body 320 via the connection terminal T2 . Figure 2 is a perspective view with an enlarged Figure 1The monomer arrays 10, 20 are shown in FIG.

[0034] The first cover body 320 has an external terminal 322 and a connector 323. The external terminal 322 includes a connection terminal T1 ( Figure 1 ) and the electrode tab 322A connected (eg, by laser welding) to the connection terminal T2 ( Figure 1 ) electrode tab 322B. Electrode tabs 322A and 322B are electrically connected to cell 11 and cell 21, respectively. For example, each of electrode tabs 322A and 322B can have an insulating and sealed structure with ceramic surrounding the electrode. In this embodiment, electrode tabs 322A and 322B serve as the negative and positive electrode tabs, respectively. Note that this is not a limitation; in the case of polarity reversal, electrode tab 322B can be the negative electrode tab, and electrode tab 322A can be the positive electrode tab.

[0035] For example, the connector 323 includes an output terminal and an input terminal. The output terminal is used to output a detection signal indicating a state in the housing 300 (e.g., the temperature of a cell) detected by one or more sensors in the housing 300 to the outside of the housing. The input terminal is used to input a control signal from the outside of the housing to one or more devices in the housing 300. For example, a temperature sensor may be provided for each cell in the housing 300.

[0036] In this embodiment, the cell array 10 and the cell array 20 have substantially the same configuration. Therefore, hereinafter, when the cells 11 to 14 and 21 to 24 are not distinguished, each of them is referred to as "cell 1," and when the connectors 2A and 2B are not distinguished, each of them is referred to as "connector 2."

[0037] Figure 3 is included in Figure 1 The exploded perspective view of the cells in the cell array 10, 20 is shown. Figure 3 Describe the structures of monomer 1 and linker 2. Figure 3 As shown, the single body 1 has two wound bodies 110A, 110B, spacers 120A, 120B, terminal members 130A, 130B, and covers 150A, 150B.

[0038] The jellyrolls 110A and 110B each have a coating portion 111A or 111B, an electrode tab 112A or 112B, and an electrode tab 113A or 113B. Each coating portion 111A or 111B is a region of the electrode foil in the positive or negative electrode sheet where the active material layer is disposed. Each electrode tab 112A, 112B, 113A, or 113B is an exposed region of the electrode foil on the positive or negative electrode sheet (an uncoated region where no active material layer is disposed). The electrode tabs 112A or 112B are located at the ends of the jellyrolls 110A or 110B in the +X direction, respectively. The electrode tabs 113A or 113B are located at the ends of the jellyrolls 110A or 110B in the -X direction, respectively.

[0039] The electrode tab 112A and the electrode tab 112B are arranged to face each other in the Y direction, and a spacer 120A and a terminal member 130A are provided between these electrode tabs 112A and 112B. The electrode tab 113A and the electrode tab 113B are arranged to face each other in the Y direction, and a spacer 120B and a terminal member 130B are provided between these electrode tabs 113A and 113B.

[0040] Each of the spacers 120A and 120B is made of an insulating material (e.g., a synthetic resin) and has insulating properties. The shape of each of the spacers 120A and 120B increases in size in the Y direction as it separates from the coating portions 111A and 111B. The terminal member 130A is connected to the end face of the spacer 120A in the +X direction. The terminal member 130B is connected to the end face of the spacer 120B in the -X direction. Each of the terminal members 130A and 130B is made of a conductive material (e.g., a metal such as aluminum) and has electrical conductivity. The wound body 110A and the wound body 110B are connected to each other via the terminal members 130A and 130B (e.g., by laser welding).

[0041] Each of the current collector terminals 140A and 140B is a component that forms part of the connection portion 2. Each of the current collector terminals 140A and 140B includes support portions 142A and 142B and protrusions 144A and 144B, respectively. One of the current collector terminals 140A and 140B serves as a positive electrode current collector terminal, and the other serves as a negative electrode current collector terminal. For example, the positive electrode current collector terminal is formed of aluminum, and the negative electrode current collector terminal is formed of copper.

[0042] Each collector terminal 140A, 140B is formed into an L-shape. Each support portion 142A, 142B is formed into a plate shape in the YZ plane, and each protrusion 144A, 144B is formed into a plate shape in the XZ plane. The support portion 142A and the protrusion 144A can be formed separately and connected together, or can be formed by folding in an integral state. Similarly, the support portion 142B and the protrusion 144B can be formed separately and connected together, or can be formed by folding in an integral state. The support portion 142A is connected (for example, by laser welding) to the end face of the terminal member 130A in the +X direction. The support portion 142B is connected (for example, by laser welding) to the end face of the terminal member 130B in the -X direction.

[0043] Cover 150A covers the ends of cell 1 in the +X direction (including electrode tabs 112A and 112B). Note that cover 150A includes a through-hole h1 for protrusion 144A. Protrusion 144A protrudes in the +X direction of cell 1 through through-hole h1. Furthermore, cover 150B covers the ends of cell 1 in the -X direction (including electrode tabs 113A and 113B). Note that cover 150B includes a through-hole h2 for protrusion 144B. Protrusion 144B protrudes in the -X direction of cell 1 through through-hole h2.

[0044] At the connection portion 2, the protrusion 144A of one of the two adjacent monomers 1 is joined (e.g., by laser welding) to the protrusion 144B of the other monomer 1. The welded portion may be protected by tape or the like. Furthermore, a laminate film (not shown) is provided on the surfaces of the two wound bodies 110A and 110B.

[0045] Note that the above configuration is merely an example of the configuration of the cell 1 and can be modified as appropriate. For example, the number of wound bodies included in the battery 1 is not limited to two, but can be one, three, or more. Furthermore, instead of a wound body, a stacked body (e.g., a stacked body comprising a positive electrode sheet and a negative electrode sheet stacked with a separator interposed therebetween) can be used as the electrode body.

[0046] For the battery 100 having the above-described configuration, further improvements in productivity are required, such as the assemblability of the cell arrays 10 and 20 with the case 300 and the connection of the case 300. In particular, since the cell arrays 10 and 20 have rectangular shapes, when the cell arrays 10 and 20 are inserted into the tubular body in a state where the tubular body is formed by the case body 310 and the bottom 340, improvements in assemblability are required due to the contact of the cell arrays 10 and 20 with the inner side of the tubular body and similar reasons.

[0047] Therefore, in this embodiment, the housing 300 includes a housing body 310 that sandwiches and holds the cell arrays 10 and 20. The cross-section of the housing body 310 includes an opening that opens in a predetermined direction. More specifically, the cross-section of the housing body 310 includes two surfaces F3 and F4 facing each other, a connecting portion connecting the ends of the two surfaces F3 and F4, and an opening. Furthermore, each of the two surfaces F3 and F4 includes a recessed portion that protrudes toward the facing surfaces and has a bottom surface that contacts the cell arrays 10 and 20.

[0048] By doing so, the cell arrays 10 and 20 can be assembled from the opening of the housing body 310. Therefore, they can be housed in the housing 300 without being inserted from the end of the tubular body. Thus, the cell arrays 10 and 20 can be easily assembled with the housing 300. Furthermore, when the cell arrays 10 and 20 are assembled with the housing body 310 and the bottom surfaces of the recesses provided on the two facing surfaces F3 and F4 are used to clamp the cell arrays 10 and 20, the housing body 310 can retain the cell arrays 10 and 20.

[0049] Figure 4 is a diagram showing an example of the configuration of a case 300 of a battery 100 which is a power storage device according to the present embodiment.

[0050] like Figure 4 As shown, on each of surfaces F3 and F4, two facing walls of the housing body 310, a plurality (in this embodiment, four, corresponding to the number of cells) of recesses 350 are formed along the longitudinal direction of surfaces F3 and F4. Each recess 350 is formed by a predetermined area (e.g., a rectangular area) recessed inward (toward the cell arrays 10 and 20). More specifically, on surface F3, four recesses 350 are formed by rectangular areas recessed in the -Y direction in the longitudinal direction of the housing body 310. Furthermore, on surface F4, four recesses 350 are formed by rectangular areas recessed in the +Y direction in the longitudinal direction of the housing body 310.

[0051] In each of surfaces F3 and F4, a plurality of rectangular slits 360 are provided between adjacent recesses 350. Each slit 360 is formed to have a predetermined length, with the Z direction being its longitudinal direction. Slits 360 are provided at positions facing connecting portions 2B between cells in cell arrays 10 and 20.

[0052] Figure 5 It is along Figure 1 The cross-sectional view taken along the VV line in FIG. Figure 5As shown, the bottom surfaces of the recesses 350 formed on surface F3 and the bottom surfaces of the recesses 350 formed on surface F4 are positioned facing each other. Furthermore, the distance between the bottom surfaces (the distance in the Y direction) is set to a length such that the bottom surfaces of the recesses on surface F3 and the bottom surfaces of the recesses on surface F4 contact the cell arrays 10 and 20 when the cell arrays 10 and 20 are assembled with the housing body 310. Therefore, when the cell arrays 10 and 20 are assembled with the housing body 310, the bottom surfaces of the recesses 350 on surface F3 and the bottom surfaces of the recesses 350 on surface F4 sandwich the cell arrays 10 and 20, and the cell arrays 10 and 20 are retained within the housing body 310.

[0053] The opening of the housing body 310 in the −Z direction is closed by the bottom 340 , the opening of the housing body 310 in the +X direction is closed by the first cover body 320 , and the opening of the housing body 310 in the −X direction is closed by the second cover body 330 , thereby constructing the housing 300 .

[0054] Note that while the example above describes a case where surface F2, which serves as the connection portion connecting surfaces F3 and F4 (which are two wall surfaces), is formed of a flat surface, convex and concave portions may be formed on surface F2 to increase the surface area more than in a case of a flat surface configuration, or surface F2 may be formed of a curved surface that convexly extends in the +Z direction or -Z direction. By doing so, the surface area of ​​surface F2 can be increased, thereby improving the heat dissipation performance of battery 100.

[0055] Furthermore, although the case where the bottom portion 340 is composed of a flat surface has been described as an example, Figure 5 As shown by the dotted line in FIG, a concave portion 342 that is concave inward (toward the cell arrays 10, 20) may be formed on the bottom 340. By doing so, the position of the cell arrays 10, 20 in the -Z direction can be restricted.

[0056] The operation of the battery 100 having the above-described structure is described. Because the cross-section of the case body 310 of the case 300 includes an opening that opens in a predetermined direction (-Z direction), the cell arrays 10 and 20 can be assembled with the case body 310 without inserting the cell arrays 10 and 20 through the opening in the +X or -X directions. After the cell arrays 10 and 20 are assembled with the case body 310, the bottom surfaces of the recesses 350 provided on the surfaces F3 and F4 of the case body 310 sandwich the surfaces of the cell arrays 10 and 20 in the Y direction, thereby restricting the movement of the cell arrays 10 and 20 in the Y and Z directions within the case body 310.

[0057] As described above, using the battery 100 as the power storage device according to this embodiment, the cell arrays 10 and 20 can be assembled from the opening of the case body 310 of the case 300. Therefore, the cell arrays 10 and 20 can be housed in the case 300 without being inserted from the ends of the case body 310 in the X direction. Thus, the cell arrays 10 and 20 can be easily assembled with the case 300. Therefore, the assemblability of the cell arrays 10 and 20 with the case 300 can be improved. Consequently, a power storage device with improved productivity can be provided.

[0058] Furthermore, by assembling the cell array 10 with the case body 310, the bottom surfaces of the recesses 350 provided on the two surfaces F3 and F4 can contact the cell arrays 10 and 20 to hold the cell arrays 10 and 20. Therefore, since components for holding the cell arrays 10 and 20 do not need to be separately provided, the number of components of the battery 100 can be limited.

[0059] Furthermore, the battery 100 as a power storage device can be formed by closing the opening of the case body 310 using the first cover body 320 , the second cover body 330 , and the bottom 340 while the cell arrays 10 and 20 are assembled with the case body 310 .

[0060] Furthermore, providing slits 360 allows air to flow into and out of battery 100, and can improve heat dissipation performance. In addition, when convex and concave portions are provided on surface F1 and / or surface F2, the surface area can be increased, thereby improving heat dissipation performance.

[0061] Hereinafter, modifications are described.

[0062] Although, in the foregoing embodiment, a configuration has been described in which the bottom 340 closes the opening of the case body 310 in the −Z direction, a configuration may be adopted in which the bottom 340 is omitted.

[0063] Furthermore, while the aforementioned embodiment describes a configuration in which the bottom portion 340 closes the opening of the housing body 310 in the -Z direction, a configuration may be employed in which, when the cell arrays 10 and 20 are held by the housing body 310, the ends (the ends in the -Z direction) of at least one of the wall surfaces of the bottom portion 340 and the two surfaces F3 and F4 of the housing body 310 are joined. Furthermore, the joining portion is not limited to continuous laser welding; joining using an adhesive or spot welding may be employed.

[0064] Furthermore, although in the aforementioned embodiment, the configuration in which the cell arrays 10 and 20 are sandwiched in the Y direction has been described as an example, a configuration in which they are sandwiched in the X direction, for example, may be employed.

[0065] Furthermore, while the aforementioned embodiment has been described as an example in which an opening is formed in the -Z direction of the case body 310 to improve the assemblability of the cell arrays 10, 20, thereby improving the productivity of the battery 100, the configuration for improving the productivity of the battery 100 is not limited to forming an opening in the -Z direction. For example, the case body 310 may be configured to include a tubular body that surrounds the longitudinal surfaces of the cell arrays 10, 20. In this case, the tubular body is constructed by folding a plate-like member so as to surround the cell arrays 10, 20 and connecting one end of the plate-like member to a member on the other end side.

[0066] Figure 6 1 and 2 show a plurality of views showing an example of the configuration of a battery 100 which is a power storage device according to a modification. Figure 1 Compared to the battery 100 shown, Figure 6 The battery 100 shown is different in the configuration of the housing 300. Since the configuration other than the housing 300 is similar to Figure 1 The configuration of the battery 100 is shown, and therefore its detailed description will not be repeated. Figure 6 (A) and (B) are views of the housing contents viewed from the +X direction.

[0067] like Figure 6 As shown, in this variation, the housing 300 includes a housing body 310, a first cover body 320, and a second cover body 330. For example, the housing body 310 is a housing having openings at the ends in the +X direction and the ends in the -X direction. The housing body 310 forms a tubular body, and the cell arrays 10 and 20 are accommodated inside the tubular body. Figure 6 The first cover body 320 and the second cover body 330 shown have the same Figure 1 The first cover body 320 and the second cover body 330 shown are similar in construction, so their detailed description will not be repeated. The housing body 310, the first cover body 320, and the second cover body 330 can be formed of the same material, or can be formed of different materials. For the material from which each of the housing body 310, the first cover body 320, and the second cover body 330 is composed, for example, metal can be used. The housing 300 can be an aluminum housing. Note that these materials can be appropriately modified. For example, at least any one of the first cover body 320 and the second cover body 330 can be formed of an insulating material.

[0068] The housing body 310 comprises a tubular body that surrounds the longitudinal surfaces (i.e., the surfaces in the Z direction and the Y direction) of the cell arrays 10 and 20. The tubular body is formed by folding a plate-like member so as to surround the outer circumference of the cell arrays 10 and 20 about the X-axis. One end of the folded plate-like member is then connected to the other end to construct the tubular body.

[0069] More specifically, if Figure 6 As shown in (A), the tubular body is constructed by folding a plate-like member at right angles, using the boundary line between surfaces F2 and F4, the boundary line between surfaces F2 and F3, the boundary line between surfaces F1 and F3, and the boundary line between surface F1 and the excess portion as folding positions. Furthermore, one end of the plate-like member (i.e., the end of surface F4 in the -Z direction) is connected to the boundary portion between surface F1 and the excess portion.

[0070] By doing so, the tubular body can be constructed by connecting one end of the plate-like member (the end of surface F4) to the member on the other end (the excess portion). This limits the number of connection locations, and the connection location from one end to the member on the other end can be set to a position separated from the cell arrays 10 and 20. Consequently, connection can be performed without affecting the cell arrays 10 and 20. This improves the productivity of the battery 100 as a power storage device.

[0071] Note that the connection position of the components on the housing body 310 from one end to the other end is not limited to Figure 6 The connection position shown in (A). For example, Figure 6 As shown in (B), a configuration may be adopted in which the positional relationship between the redundant portion and the surface F4 is the same as Figure 6 In the case where the positional relationship shown in (A) is reversed, the excess portion is positioned outside one end of surface F4 (in the -Y direction), and the one end of surface F4 is folded so that the plane of the excess portion and surface F4 (excluding the one end in the -Z direction) are on the same plane, and a step is formed at the one end of surface F4. In this case, the one end of the excess portion is connected to the step of surface F4.

[0072] By doing so, the tubular body can be constructed by connecting one end of the plate-like member (the end of the excess portion) to the member on the other end (the stepped portion of surface F4). This reduces the number of connection locations, and the connection portion from one end to the member on the other end can be located at a position separated from the cell arrays 10 and 20. Consequently, connection can be performed without affecting the cell arrays 10 and 20. This improves the productivity of the battery 100 as a power storage device.

[0073] Note that all or part of the aforementioned variations may be appropriately combined and implemented.

[0074] It should be understood that the embodiments disclosed herein are illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the claims rather than the foregoing description, and is intended to include all modifications within the scope and spirit of the claims and equivalents.

Claims

1. An electric storage device comprising: A monomer array, comprising: Multiple monomers, and a connecting portion providing electrical connection between adjacent cells among the cells; and a housing accommodating the array of cells, wherein: The housing includes a first member in which the array of cells is clamped and retained; and In a cross section of the first member, an opening portion opening in a predetermined direction is provided.

2. The power storage device according to claim 1, wherein: In a cross section of the first member, two wall surfaces disposed to face each other, a connecting portion connecting end portions of the two wall surfaces, and the opening portion are provided; and On each of the two wall surfaces, a recessed portion is provided which is provided to protrude toward the facing wall surface and has a bottom surface in contact with the cell array.

3. The power storage device according to claim 1, wherein: The housing comprises: a second member that closes the opening of the first member to form a tubular body; a third member configured to close one end of the tubular body, and A fourth member is configured to close the other end of the tubular body.

4. An electric storage device comprising: A monomer array, comprising: Multiple monomers, and a connecting portion providing electrical connection between adjacent cells among the cells; and a housing accommodating the array of cells, wherein: The housing includes a tubular body that surrounds the periphery of a surface of the cell array, the surface being along a longitudinal direction; and The tubular body is constructed by folding a plate-like member so as to provide a wall surface facing each surface of the cell array in the longitudinal direction and joining one end of the plate-like member to a member on the other end side of the plate-like member.

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