Electricity storage device and vehicle

Abstract

The invention relates to a power storage device and a vehicle. The power storage device includes a case and a cell connector accommodated in the case. The cell connection body includes a plurality of power storage cells and a connection portion that electrically connects the power storage cells to each other. The power storage device further includes a holding member that holds the at least one power storage cell between the inner surface of the case and the cell connector.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This non-provisional application is based on Japanese Patent Application No. 2024-039268 filed with the Japan Patent Office on March 13, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to an electric storage device and a vehicle including the electric storage device. Background Art

[0004] Japanese National Patent Publication No. 2023-502457 discloses a parallelepiped-shaped battery (electricity storage device) having a length L of 400 mm to 2500 mm and a ratio (L / H) of length L to width H of 4 to 21. Summary of the Invention

[0005] The power storage device described in Japanese National Patent Publication No. 2023-502457 features a housing (casing) containing multiple electrode core groups connected in series and arranged in a straight line. In this power storage device, the electrode core groups correspond to power storage cells. This connection of multiple power storage cells in a straight line is hereinafter referred to as a "cell connection."

[0006] In the power storage device described in Japanese National Patent Publication No. 2023-502457, excessive movement of the cell connection body in the case tends to cause damage to a portion of the connection portion between the power storage cells and the like.

[0007] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to improve the durability of a power storage device including a cell connected body.

[0008] According to a first aspect of the present disclosure, there is provided a power storage device shown below.

[0009] (Clause 1) An electricity storage device includes a housing and a cell connector housed in the housing. The cell connector includes a plurality of electricity storage cells and a connector that electrically connects the electricity storage cells to each other. The electricity storage device further includes one or more retaining members that retain at least one of the plurality of electricity storage cells between the inner surface of the housing and the cell connector.

[0010] In this configuration, at least one of the plurality of storage cells included in the cell connector is retained by a retaining member, making it less likely that the cell connector will move. Therefore, a portion of the connection portion between the storage cells and the like is less likely to be damaged. According to this configuration, the durability of the storage device against external impacts and the like is improved. The connection portion can be formed by a conductive member. The connection portion can connect the electrodes of adjacent storage cells to each other to electrically connect these storage cells to each other. The positive electrode of one storage cell and the negative electrode of the other storage cell of two adjacent storage cells can be connected to each other through the connection portion.

[0011] (Clause 2) In the power storage device described in Clause 1, the one or more holding members include a first holding member formed along the cell connecting body to hold a first surface of each of the plurality of power storage cells.

[0012] Since one holding member (first holding member) holds the first surface of each power storage cell included in the cell connected body as described above, the cell connected body can be appropriately held while reducing the number of components.

[0013] (Clause 3) In the power storage device described in clause 2, a plate-shaped first main body portion and one or more first protrusions protruding from the first main body portion toward the cell connecting body are included.

[0014] According to the first holding member configured as described above, the first projections more easily restrict movement of the individual connection bodies.

[0015] (Clause 4) In the power storage device described in Clause 2 or 3, the one or more holding members further include a second holding member formed along the cell connector to hold a second surface opposite to the first surface of each of the plurality of power storage cells.

[0016] When the second holding member holds the second surface of each power storage cell included in the cell connection body, the first holding member and the second holding member can clamp each power storage cell included in the cell connection body. According to this configuration, the cell connection body can be more easily properly held.

[0017] (Clause 5) In the power storage device described in Clause 4, the second holding member includes a plate-shaped second main body portion and one or more second protrusions protruding from the second main body portion toward the cell connecting body.

[0018] According to the second holding member configured as described above, the second convex portion more easily restricts the movement of the single-unit connected body.

[0019] (Clause 6) In the power storage device according to any one of clauses 2 to 5, a flow path is provided in at least one of the first holding member and the second holding member. The flow path is configured to discharge gas generated from at least one of the plurality of power storage cells.

[0020] According to this configuration, the gas generated from the power storage cells can be discharged more easily and appropriately.

[0021] (Clause 7) In the power storage device according to any one of Clauses 2 to 6, at least one of the first holding member and the second holding member has a hollow structure.

[0022] Since the cavity is provided in at least one of the first holding member and the second holding member as described above, an impact applied to the housing from the outside is more easily absorbed by at least one of the first holding member and the second holding member.

[0023] (Clause 8) In the power storage device according to any one of clauses 4 to 7, the thermal conductivity of the second holding member is higher than the thermal conductivity of the first holding member.

[0024] In this power storage device, the second holding member located on the second surface side of the power storage cell has high thermal conductivity. Therefore, the power storage cell is more easily heated or cooled from the second surface side of the power storage cell.

[0025] (Clause 9) In the power storage device described in Clause 8, the second holding member contains metal, and the first holding member contains resin.

[0026] Since the second holding member contains metal as described above, the second holding member has high thermal conductivity. On the other hand, the first holding member containing resin is excellent in toughness and formability, and therefore it easily holds each power storage cell included in the cell connection body.

[0027] (Clause 10) In the power storage device of any one of Clauses 4 to 9, a tapered surface is formed at an end portion of each of the first holding member and the second holding member.

[0028] Since the tapered surface is formed at the end of each retaining member as described above, the single-body connected body to which the first retaining member and the second retaining member are attached is more easily inserted into the housing.

[0029] (Clause 11) In the power storage device according to any one of clauses 4 to 10, the cell connection body, the first holding member, and the second holding member are formed integrally by winding a member in the form of a wire, a tape, or a sheet.

[0030] Since the single-body connection body, the first holding member, and the second holding member are integrally formed as described above, there is less possibility of positional displacement.

[0031] (Clause 12) In the power storage device described in any one of Clauses 1 to 11, the housing has a parallelepipedal geometry. The housing includes four surfaces extending along the connection direction of the cell connector and two surfaces covering the ends of the cell connector. The four surfaces include a first opposing surface, which is a pair of surfaces facing each other, and a second opposing surface, which is an opposing surface having a larger area than the first opposing surface. A retaining member is disposed on the first opposing surface.

[0032] Since the holding members are arranged on the opposing surfaces (a pair of opposing surfaces) having a small area as described above, the size of the holding member that holds the power storage cell can be made smaller more easily.

[0033] According to a second aspect of the present disclosure, there is provided a vehicle as follows.

[0034] (Clause 13) A vehicle includes the power storage device according to any one of clauses 1 to 12.

[0035] In combination with this vehicle, the durability of the power storage device including the cell connected body is improved.

[0036] The foregoing and other objects, features, aspects and advantages of the present disclosure will become more apparent from the following detailed description of the present disclosure when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 1 is a diagram for explaining the configuration of a power storage device according to an embodiment of the present disclosure.

[0038] Figure 2 is a perspective view showing in enlarged form the Figure 1 The interior of the housing of the power storage device is shown.

[0039] Figure 3 Is used to show Figure 1 Diagram of the configuration of each monomer linker shown.

[0040] Figure 4 is included in Figure 1 An exploded perspective view of each power storage cell in the cell connection body is shown.

[0041] Figure 5 It is along Figure 1 Cross-sectional view along line VV in FIG.

[0042] Figure 6 It is along Figure 1Cross-sectional view along line VI-VI in FIG.

[0043] Figure 7 It shows Figure 1 A diagram of a first variation of the power storage device is shown.

[0044] Figure 8 is a power storage device according to the first modification corresponding to Figure 5 Cross-sectional view of .

[0045] Figure 9 is a power storage device according to the first modification corresponding to Figure 6 Cross-sectional view of .

[0046] Figure 10 It shows Figure 1 A diagram showing a second variation of the power storage device is shown.

[0047] Figure 11 It shows Figure 1 A diagram showing a third variation of the power storage device is shown.

[0048] Figure 12 It shows Figure 1 A diagram showing a fourth variation of the power storage device is shown.

[0049] Figure 13 It shows Figure 1 A diagram showing a fifth variation of the power storage device is shown.

[0050] Figure 14 It shows Figure 1 A diagram showing a sixth variation of the power storage device is shown.

[0051] Figure 15 It shows Figure 1 A diagram showing a seventh variation of the power storage device is shown.

[0052] Figure 16 It shows Figure 1 FIG. 8 shows an eighth variation of the power storage device.

[0053] Figure 17 It shows Figure 1 A diagram showing a ninth variation of the power storage device is shown.

[0054] Figure 18 It shows Figure 1 A diagram showing a tenth variation of the power storage device is shown.

[0055] Figure 19 It shows Figure 1 FIG. 11 shows an eleventh variation of the power storage device.

[0056] Figure 20 It shows Figure 1 A diagram showing a twelfth variation of the power storage device is shown.

[0057] Figure 21 It is along Figure 20 Cross-sectional view along line XXI-XXI in FIG.

[0058] Figure 22 is a diagram illustrating an exemplary power storage module including a plurality of batteries.

[0059] Figure 23 Is shown installed with Figure 22 Figure 1 shows an exemplary vehicle with a power storage module. DETAILED DESCRIPTION

[0060] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The same or corresponding elements in the drawings are assigned the same reference numerals, and their description will not be repeated. In each of the figures mentioned below, among the X-axis, Y-axis, and Z-axis that are orthogonal to each other, the X-axis represents the first in-plane direction of the battery (e.g., the length direction), the Y-axis represents the second in-plane direction of the battery (e.g., the width direction), and the Z-axis represents the height direction of the battery. The direction indicated by the arrow along each of the X-axis, Y-axis, and Z-axis is represented by "+" below, and the opposite direction is represented by "-".

[0061] Figure 1 is a diagram for explaining the configuration of the power storage device according to this embodiment. Figure 1 The "Internal Structure Diagram of the Housing - Z" in the figure is a diagram of the components in the housing as viewed from the +Z side. The "Internal Structure Diagram of the Housing - Y" is a diagram of the components in the housing as viewed from the +Y side.

[0062] The power storage device according to this embodiment is Figure 1 Battery 100 is shown. Battery 100 is a secondary battery, such as a lithium-ion battery, a nickel-metal hydride battery, or a sodium-ion battery. Exemplary lithium-ion batteries include LFP batteries using lithium iron phosphate as the positive electrode active material or ternary batteries using nickel-manganese-cobalt (NMC) as the positive electrode active material. The secondary battery can be a liquid secondary battery or an all-solid secondary battery. Although details will be described later, battery 100 includes a plurality of power storage cells, each of which functions as a secondary battery. Battery 100 can include only power storage cells of the same type (e.g., only LFP cells) or different types of power storage cells (e.g., LFP cells and ternary cells).

[0063] The battery 100 includes a housing 300. The housing 300 has a parallelepiped geometry. The housing 300 includes a pair of surfaces F1 and F2 (first opposing surfaces) that oppose each other in the Z direction, a pair of surfaces F3 and F4 (second opposing surfaces) that oppose each other in the Y direction, and surfaces F5 and F6 (end surfaces in the X direction) located at respective ends in the X direction. The area of ​​each of surfaces F1 and F2 is smaller than the area of ​​each of surfaces F3 and F4. The length of the housing 300 (the dimension in the X direction) is longer than its width (the dimension in the Y direction). The length of the housing 300 may be no less than 250 mm and no more than 5000 mm, and may be, for example, approximately 1000 mm. The width of the housing 300 may be no less than 10 mm and no more than 1250 mm, and may be, for example, approximately 50 mm. The ratio of the length to the width of the housing 300 may 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. The size of the housing 300 is not limited to the above.

[0064] The housing 300 includes a main body 310 and a cover 320. The main body 310 is a hollow housing with a bottom, for example, with an opening on the end face on the +X side. The cell connectors 10 and 20 are housed therein. The cover 320 is a plate-like member (covering member) having a geometric shape corresponding to the opening in the main body 310, and closes the +X side opening in the main body 310. The main body 310 and the cover 320 can be formed of the same material or different materials. For example, metal can be used as the material for each of the main body 310 and the cover 320. The housing 300 can be made of aluminum. These materials can be varied as appropriate. For example, the cover 320 can be formed of an insulating material.

[0065] The cell connector 10 includes four power storage cells 11 to 14 and three connection portions 2A that electrically connect these power storage cells to each other. The power storage cells 11 to 14 are connected in a straight line along the X direction in the housing 300. The cell connector 20 includes four power storage cells 21 to 24 and three connection portions 2B that electrically connect these power storage cells to each other. The power storage cells 21 to 24 are connected in a straight line along the X direction in the housing 300. Therefore, the cell connector 10 and the cell connector 20 are arranged parallel to the X direction. Each of the surfaces F1 to F4 of the housing 300 extends in the connection direction (X direction) of the cell connectors 10 and 20. Each of the surfaces F5 and F6 of the housing 300 covers the ends of the cell connectors 10 and 20 in the X direction. Each power storage device included in the cell connectors 10 and 20 is configured to store electricity.

[0066] In the housing 300 of the battery 100, the cell connector 10 and the cell connector 20 are electrically connected to each other. Figure 1 As shown, for example, the end portion on the -X side of the cell connector 10 (storage cell 14) and the end portion on the -X side of the cell connector 20 (storage cell 24) are electrically connected to each other by a U-shaped connector 2C in the housing 300. The connector 2C has a U-shaped cross section, while each of the connectors 2A and 2B has an I-shaped cross section. The connector 2C is basically similar in structure to the connector 2A or 2B except that it is formed in a different shape. The connector 2C may be an integrally formed article or a composite of a plurality of separately formed parts. For example, the connector 2C may be formed by a protrusion 144B ( Figure 3 ) and the protrusion 144B ( Figure 3 ) is formed by connecting conductive materials (beam portions) to each other. The protrusion 144B will be described later.

[0067] The cell connectors 10 and 20 are arranged so that the positions of the storage cells are aligned and the positions of the connecting parts are aligned. The storage cells 11, 12, 13 and 14 included in the cell connector 10 are respectively superimposed on the storage cells 21, 22, 23 and 24 included in the cell connector 20 in the Y direction. In other words, all the storage cells included in the cell connector 10 are arranged to be opposite to any storage cells included in the cell connector 20 in the Y direction. The end face on the -Z side of each storage cell may be referred to as the "first surface" hereinafter, and the end face on the +Z side of each storage cell (the end face opposite to the first surface) may be referred to as the "second surface" hereinafter.

[0068] The retaining members 51 and 52 are further housed in the housing 300. The retaining members 51 and 52 are located between the inner surface of the housing 300 (more specifically, the inner surface of the main body 310) and the corresponding cell connectors 10 and 20. Each of the cell connectors 10 and 20 is formed parallel to the X direction. The retaining members 51 and 52 are formed along the cell connectors 10 and 20 and are formed to be elongated in the X direction. The retaining member 51 retains the first surface of each of the power storage cells 11 to 14 included in the cell connector 10 and the first surface of each of the power storage cells 21 to 24 included in the cell connector 20. The retaining member 52 retains the second surface of each of the power storage cells 11 to 14 included in the cell connector 10 and the second surface of each of the power storage cells 21 to 24 included in the cell connector 20. The cell connectors 10 and 20 are clamped by the retaining members 51 and 52. According to the holding members 51 and 52, the monomer connection bodies 10 and 20 can be appropriately held while reducing the number of parts. The holding members 51 and 52 correspond to an exemplary "first holding member" and an exemplary "second holding member" according to the present disclosure, respectively. The details of the holding members 51 and 52 will be described later (see Figure 5 and 6 ).

[0069] The +X side end (power storage cell 11 ) of the cell connection body 10 is connected to the cover 320 via the inserted connection terminal T1 . The +X side end (power storage cell 21 ) of the cell connection body 20 is connected to the cover 320 via the inserted connection terminal T2 . Figure 2 1 is a perspective view showing the ends on the +X side of the cell connection bodies 10 and 20 in an enlarged manner, in which the holding members 51 and 52 have been removed.

[0070] The cover 320 includes a sealing hole 321, an external terminal 322, and a connector 323. The sealing hole 321 may be a pressure regulating hole for regulating the pressure in the housing 300. The sealing hole 321 has a sealing structure, for example, a metal cap (outside the housing) and a sealing member (inside the housing). Although this sealing structure ensures airtightness in the housing 300, when the pressure in the housing 300 exceeds a prescribed level, gas is discharged to the outside of the housing 300 through the sealing hole 321. The external terminal 322 includes a connection terminal T1 (connected to the cell connector 10 by, for example, laser welding). Figure 1 ) and the electrode tab 322A joined (eg, by laser welding) to the connection terminal T2 ( Figure 1) electrode tab 322B. Electrode tabs 322A and 322B are electrically connected to power cells 11 and 21, respectively. Each of electrode tabs 322A and 322B can be provided with an insulating seal structure, for example, made of ceramic surrounding the electrode. In this embodiment, electrode tabs 322A and 322B serve as the negative electrode tab and the positive electrode tab, respectively. Without limitation, in the case of polarity reversal, electrode tab 322B can serve as the negative electrode tab, and electrode tab 322A can serve as the positive electrode tab. Connector 323 includes, for example, an output terminal that outputs detection signals indicating the status of housing 300 (e.g., the temperature of each power cell) detected by one or more sensors in housing 300 to the outside of the housing, and an input terminal that receives control signals from the outside of the housing to one or more devices in housing 300. For example, a temperature sensor can be provided for each power cell in housing 300.

[0071] With the retaining members 51 and 52 attached to the cell connectors 10 and 20, the cell connectors 10 and 20 are inserted into the main body 310. Since the storage cells are held by the retaining members 51 and 52, the insertion of the cell connectors 10 and 20 into the main body 310 is facilitated. The retaining members 51 and 52 can be attached before or after welding the connecting portions 2A and 2B (e.g., welding the protrusions 144A and 144B, which will be described later). After the cell connectors 10 and 20 are inserted into the main body 310 along with the retaining members 51 and 52, the main body 310 and the cover 320 are joined. The main body 310 and the cover 320 are welded together, for example, using a laser.

[0072] In this embodiment, the cell connecting body 10 and the cell connecting body 20 are substantially identical in structure. Therefore, when the storage cells 11 to 14 and the storage cells 21 to 24 are not distinguished, they are hereinafter referred to as "storage cells 1", and when the connection portion 2A and the connection portion 2B are not distinguished, they are hereinafter referred to as "connection portion 2".

[0073] Figure 3 is a diagram for illustrating the configuration of each monomer linker 10 and 20. Figure 3 As shown, each cell connector includes four storage cells 1. Connecting portions 2 are provided between adjacent storage cells 1, and the connecting portions 2 electrically connect these storage cells 1 to each other. Each cell connector is composed of alternatingly aligned storage cells 1 and connecting portions 2. In each of the cell connectors 10 and 20, the storage cells 1 are connected to each other by the connecting portions 2. The rigidity of the connecting portions 2 is lower than that of the storage cells 1. The storage cells 11 to 14 and 21 to 24 are formed by the same storage cells 1. By forming the cell connectors 10 and 20 by common storage cells 1, the manufacture of the battery 100 is facilitated and the manufacturing cost can be reduced.

[0074] The configuration of cell connectors 10 and 20 is not limited to that described above. Each cell connector may include storage cells of varying sizes or shapes. The number of storage cells to be housed in housing 300 is not limited to eight, but may vary as appropriate. The number of storage cells included in each cell connector may be less than four, may be no less than five and no more than nineteen, or may be equal to or greater than twenty.

[0075] In this embodiment, the power storage cell 1 is a laminated cell including one or more wound bodies. In the laminated cell, one or more wound bodies serving as an electrode assembly are covered with a laminated outer body. Figure 2 The battery cell is shown without a laminated outer body. The wound body has a structure in which, for example, a positive electrode sheet and a negative electrode sheet are wound with a separator therebetween. Each of the positive electrode sheet and the negative electrode sheet includes an electrode foil and an active material layer.

[0076] Figure 4 This is an exploded perspective view of the battery cell 1. Figure 3 Cross-sectional view (XY cross-sectional view around the connection portion 2) and Figure 4 The structures of the power storage cells 1 and the connection portion 2 will be described.

[0077] like Figure 4 As shown, the power storage cell 1 includes two wound bodies 110A and 110B, separators 120A and 120B, terminal members 130A and 130B, and covers 150A and 150B.

[0078] Jelly jelly roll 110A includes a coating portion 111A, an electrode tab 112A, and an electrode tab 113A. Jelly jelly roll 110B includes a coating portion 111B, an electrode tab 112B, and an electrode tab 113B. Each of coating portions 111A and 111B is a region of the positive or negative electrode sheet where the active material layer is disposed within the electrode foil. Each of electrode tabs 112A, 112B, 113A, and 113B is an area of ​​the positive or negative electrode sheet where the electrode foil is exposed (an uncoated region where the active material layer is not disposed). Electrode tabs 112A and 112B are located at the ends of the jelly jelly rolls 110A and 110B on the +X side, respectively. Electrode tabs 113A and 113B are located at the ends of the jelly jelly rolls 110A and 110B on the -X side, respectively.

[0079] The electrode tab 112A and the electrode tab 112B are arranged to be superimposed in the Y direction, and the spacer 120A and the terminal member 130A are provided between the electrode tab 112A and the electrode tab 112B (see FIG. Figure 3). The electrode tab 113A and the electrode tab 113B are arranged to be superimposed in the Y direction, and the spacer 120B and the terminal member 130B are provided between the electrode tab 113A and the electrode tab 113B (see Figure 3 ).

[0080] Each of the spacers 120A and 120B contains an insulating material (eg, synthetic resin) and is insulative. The spacers 120A and 120B each have a shape in which the size thereof in the Y direction increases as they are farther away from the coating portions 111A and 111B (see FIG. 1 ). Figure 3 Terminal member 130A is connected to the end surface on the +X side of spacer 120A. Terminal member 130B is connected to the end surface on the -X side of spacer 120B. Each of terminal members 130A and 130B is made of a conductive material (e.g., a metal such as aluminum or copper) and is electrically conductive. The wound body 110A and the wound body 110B are joined to each other (e.g., by laser welding) with terminal members 130A and 130B interposed therebetween.

[0081] Each of the current collector terminals 140A and 140B forms part of the connection portion 2. Current collector terminal 140A includes a support portion 142A and a protrusion 144A. Current collector terminal 140B includes a support portion 142B and a protrusion 144B. One of 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. In one example, the positive electrode current collector terminal is formed of aluminum, while the negative electrode current collector terminal is formed of copper.

[0082] Each of the collector terminals 140A and 140B is formed in an L-shape. Each of the support portions 142A and 142B is formed in the shape of a plate on the YZ plane, and each of the protrusions 144A and 144B is formed in the shape of a plate on the XZ plane. The support portion 142A and the protrusion 144A may be formed separately from each other and then joined to each other, or may be formed when integrally molded by bending. The support portion 142B and the protrusion 144B may also be formed separately from each other and then joined to each other, or may be formed when integrally molded by bending. The support portion 142A is joined (for example, by laser welding) to the end face on the +X side of the terminal member 130A (see Figure 3 ). The support portion 142B is joined (eg, laser welded) to the end surface on the -X side of the terminal member 130B (see Figure 3 ).

[0083] The cover 150A covers the end portion on the +X side of the storage cell 1 (including the electrode tabs 112A and 112B). The cover 150A is provided with a through hole h1 for the protrusion 144A. The protrusion 144A passes through the through hole h1 and protrudes on the +X side of the storage cell 1 (see Figure 3 ). The cover 150B covers the end portion on the -X side of the storage cell 1 (including the electrode tabs 113A and 113B). The cover 150B is provided with a through hole h2 for the protrusion 144B. The protrusion 144B passes through the through hole h2 and protrudes on the -X side of the storage cell 1 (see Figure 3 ).

[0084] like Figure 3 As shown, in the connection portion 2, the protrusion 144A of one of the two adjacent storage cells 1 is joined to the protrusion 144B of the other storage cell 1 (for example, by laser welding). The welded portion can be protected with tape or the like. Figure 4 Not shown, but a Figure 3 The laminated outer body 160 is shown. The laminated outer body 160 is, for example, a laminated film, and is provided on the surface of the power storage cell 1 .

[0085] The above configuration is merely an example of the configuration of the power storage cell 1 and can be modified as appropriate. For example, the number of wound bodies included in the power storage cell 1 is not limited to two, and a single wound body or at least three wound bodies may be provided. Instead of a wound body, a laminated body (e.g., a laminated body in which positive and negative electrode sheets are stacked with a separator therebetween) may be used as the electrode assembly.

[0086] Figure 5 It is along Figure 1 Cross-sectional view along line VV in FIG. Figure 6 It is along Figure 1 Cross-sectional view along line VI-VI in FIG.

[0087] like Figure 5 and Figure 6 As shown, an insulating layer 3 composed of a resin such as polyethylene terephthalate (PET) is provided on the inner surface of the main body 310 of the housing 300. This layer electrically isolates the housing 300 and the components within it. However, in batteries where sufficient insulation is ensured, the insulating layer 3 is not necessary. For example, the cell connectors 10 and 20 and the retaining members 51 and 52 may be covered with an insulating film (insulating layer). By integrating these components with the insulating film, the ease of insertion into the housing 300 is improved.

[0088] like Figure 5 and Figure 6As shown, the retaining member 51 is formed essentially in a plate shape. In addition to a plate-shaped main body (first main body), the retaining member 51 includes projections P11 to P14 (first projections) that project from this main body toward the cell connecting bodies 10 and 20. Each of these projections P11 to P14 projects toward the cell connecting bodies 10 and 20 (the +Z side). The retaining member 52 is also formed essentially in a plate shape. In addition to a plate-shaped main body (second main body), the retaining member 52 includes projections P21 to P24 (second projections) that project from this main body toward the cell connecting bodies 10 and 20. Each of these projections P21 to P24 projects toward the -Z side. Each of the retaining members 51 and 52 is made of an insulating material (e.g., resin) and is insulative. Each of the retaining members 51 and 52 may be an integrally formed article or such a composite that a plurality of separately formed members are connected to each other.

[0089] like Figure 5 As shown, the shapes of protrusions P11 to P13 conform to the first surfaces of adjacent storage cells 13 and 23 in the Y direction, and protrusions P11 to P13 retain the ends of the first surfaces, thereby holding storage cells 13 and 23 in a predetermined position. Specifically, protrusions P11 and P12 are located at the ends (corners) of the first surfaces of storage cells 13 and 23 in the Y direction and function as claws. Protrusion P11 captures the corners of storage cell 13 and prevents movement of storage cell 13 toward the +Y side. Protrusion P12 captures the corners of storage cell 23 and prevents movement of storage cell 23 toward the -Y side. Protrusion P13 engages the boundary between the first surfaces of storage cells 13 and 23, preventing positional displacement of storage cells 13 and 23. The shapes of protrusions P21 to P23 conform to the second surfaces of adjacent storage cells 13 and 23 in the Y direction, and they hold the ends of the second surfaces, thereby retaining storage cells 13 and 23 in a predetermined position. Specifically, protrusions P21 and P22 are located at the ends (corners) of the second surfaces of storage cells 13 and 23 in the Y direction and function as claws. Protrusion P21 captures the corners of storage cell 13 and prevents movement of storage cell 13 toward the +Y side. Protrusion P22 captures the corners of storage cell 23 and prevents movement of storage cell 23 toward the -Y side. Protrusion P23 engages the boundary between the second surfaces of storage cells 13 and 23, preventing positional displacement of storage cells 13 and 23.

[0090] Although Figure 5Only the protrusions P11 to P13 and P21 to P23 are shown representatively as being arranged for a pair of storage cells 13 and 23 adjacent in the Y direction, but the protrusions P11 to P13 and P21 to P23 are also maintained in a similar structure for other pairs of storage cells adjacent in the Y direction (a pair of storage cells 11 and 21, a pair of storage cells 12 and 22, and a pair of storage cells 14 and 24).

[0091] like Figure 6 As shown, similar to the connection portion 2A, each of the protrusions P14 and P24 is located between adjacent storage cells in the cell connector 10. Each of the protrusions P14 and P24 has a size (size in the X direction) corresponding to the interval between the storage cells, and serves as a spacer. The protrusion P14 holds the end of the first surface of each of two adjacent storage cells in the cell connector 10, and is used to set the interval between adjacent storage cells to be constant. The protrusion P24 holds the end of the second surface of each of two adjacent storage cells in the cell connector 10, and is used to set the interval between adjacent storage cells to be constant. Each of the protrusions P14 and P24 limits the movement of the storage cell 12 toward the -X side and the movement of the storage cell 13 toward the +X side, and suppresses the storage cells 12 and 13 from being too close to each other, for example, as Figure 6 shown.

[0092] Although Figure 6 Only the projections P14 and P24 are shown representatively as being arranged around the pair of storage cells 12 and 13, but the projections P14 and P24 hold the other adjacent pairs of storage cells (the pair of storage cells 11 and 12 and the pair of storage cells 13 and 14) in the cell connection body 10 in a similar structure. Each of the holding members 51 and 52 also holds each adjacent pair of storage cells (the pair of storage cells 21 and 22, the pair of storage cells 22 and 23, and the pair of storage cells 23 and 24) in the cell connection body 20, with the projections being similar in structure to the projections P14 and P24. Figure 6 The protrusions P14 and P24 shown are used for the cell connection body 10. The protrusions P14 and P24 can be arranged between the connection part 2A and the connection part 2B in the Y direction. The protrusions P14 and P24 arranged in this way serve as spacers shared by the cell connection bodies 10 and 20.

[0093] In the battery 100 according to this embodiment, retaining members 51 and 52 are provided between the inner surface of the housing 300 and the corresponding cell connectors 10 and 20. The power storage cells included in the cell connectors 10 and 20 are retained by retaining members 51 and 52. Consequently, the cell connectors 10 and 20 are less likely to move, and the connections between the power storage cells are less likely to be damaged. This configuration improves the durability of the battery 100 (power storage device) against external impacts and the like.

[0094] like Figure 1 、 Figure 5 and Figure 6 As shown, retaining members 51 and 52 are arranged on first opposing surfaces (surfaces F1 and F2), which have a smaller area than second opposing surfaces (surfaces F3 and F4). Therefore, since retaining members 51 and 52 are arranged on the two opposing surfaces (surfaces F1 and F2), which have smaller areas, it is easier to reduce the size of retaining members 51 and 52 that retain each power storage cell included in cell connectors 10 and 20. Without limitation, retaining members 51 and 52 may also be provided on the second opposing surfaces in place of or in addition to the first opposing surfaces.

[0095] Retaining members 51 and 52 can be fixed to housing 300 using an adhesive. However, by not employing this type of fixing method, the recyclability of the power storage device tends to be higher. In battery 100 (power storage device) according to this embodiment, retaining members 51 and 52 retain each power storage cell included in cell connectors 10 and 20. Therefore, adhesive is not necessary, or any adhesive used may have weak adhesion. Consequently, the recyclability of the power storage device is improved. Even when cell connectors 10 and 20 move within housing 300 while being held by retaining members 51 and 52, the positional relationship between the power storage cells remains unchanged, and therefore, connection portions 2A to 2C are less likely to be damaged.

[0096] Figure 7 It shows Figure 1 A diagram of a first variant of a battery is shown. Figure 8 The battery according to the first modification corresponds to Figure 5 Cross-sectional view of . Figure 9 The battery according to the first modification corresponds to Figure 6 Cross-sectional view of .

[0097] like Figure 7 As shown, the battery 100A according to the first modification is substantially similar in structure to Figure 1 The battery 100 shown. The battery 100A includes a housing 300A instead of the housing 300 ( Figure 1 ), and includes holding members 51A and 51B instead of holding members 51 and 52 ( Figure 1 The housing 300A includes a main body 310A and covers 320 and 330. The main body 310A is a hollow housing having openings on both opposite end faces in the X direction (the +X end face and the -X end face), and houses the connected cell bodies 10 and 20 therein. Figure 7 The cover 320 shown in FIG. Figure 1The cover 320 shown in FIG is identical and closes the opening on the +X side of the main body 310A. The cover 320 is provided with a sealing hole 321. The cover 330 closes the opening on the -X side of the main body 310A. The cover 330 is provided with a sealing hole 331. Each of the sealing holes 321 and 331 has a sealing structure, for example, comprising a metal cap (external to the housing) and a sealing member (inside the housing). While this sealing structure ensures airtightness within the housing 300A, when the pressure within the housing 300A exceeds a specified level, gas is discharged to the outside of the housing 300A through the sealing holes 321 and 331.

[0098] like Figures 7 to 9 As shown, by retaining members 51 and 52 (see Figure 1 ) are provided with flow paths GL1 and GL2 to obtain the holding members 51A and 52A, respectively. Each of the flow paths GL1 and GL2 is a flow path through which the gas generated from the power storage unit is discharged. Specifically, Figure 9 The projections P14A and P24A shown in FIG are formed by the projections P14 and P24 (see Figure 6 ) are provided with through-holes (e.g., holes extending in the Z direction) in each of the housings 300A. These through-holes allow the space between two adjacent storage cells in the X direction to communicate with flow paths GL1 and GL2. Each of the through-holes and flow paths GL1 and GL2 guides the gas generated from each storage cell included in cell connectors 10 and 20 housed in housing 300A to sealing holes 321 or 331. Each of sealing holes 321 and 331 is configured to discharge the gas within housing 300A to the exterior of housing 300A. This configuration facilitates the proper discharge of gas generated from the storage cells.

[0099] The flow paths GL1 and GL2 define cavities inside the retaining members 51A and 52A, respectively. Therefore, each retaining member 51A and 52A has a hollow structure. Therefore, an impact applied to the housing 300A from the outside is more easily absorbed by the retaining members 51A and 52A. Each of the flow paths GL1 and GL2 can be provided by mechanical processing or chemically by etching or the like. The flow path may be provided only in Figure 1 In one of the holding members 51 and 52 shown.

[0100] Figure 10 It shows Figure 1 FIG. 2 shows a second variant of the battery. Figure 10 As shown, the battery 100B according to the second modification is substantially similar in structure to Figure 7 The battery 100A shown. The battery 100B includes holding members 51B and 52B instead of the holding members 51A and 52A ( Figure 7By providing the retaining members 51 and 52 (see Figure 1 ) to obtain the holding members 51B and 52B respectively by forming the cavities R1 and R2 of the gas discharge flow path in the holding member 51B. In the holding member 51B, a plurality of cavities R1 are provided. In the holding member 52B, a plurality of cavities R2 are provided. Therefore, each of the holding members 51B and 52B has a hollow structure. Therefore, the impact applied to the housing 300A from the outside is more easily absorbed by the holding members 51B and 52B. Each of the cavities R1 and R2 can be a cavity in a porous body. The cavity can be provided only in Figure 1 In one of the holding members 51 and 52 shown.

[0101] Figure 11 It shows Figure 1 FIG. 3 shows a third variant of a battery. Figure 11 As shown, the battery 100C according to the third modification is configured so that the holding member 52A ( Figure 7 ) has been Figure 7 Battery 100A is shown removed. In battery 100C, the space (region R3) between the second surface of each power storage cell included in cell connectors 10 and 20 and the inner surface (top surface) of case 300A serves as a gas discharge flow path (a flow path through which the gas generated from each power storage cell is guided to sealing hole 321 or 331).

[0102] Figure 12 It shows Figure 1 FIG4 is a diagram of a fourth variation of a battery shown in FIG4. Figure 12 As shown, the battery 100D according to the fourth modification is basically similar in structure to Figure 1 The battery 100 shown. The battery 100D includes holding members 51D and 52D instead of the holding members 51 and 52 ( Figure 1 ). Tapered surfaces TP1 and TP2 are formed at the ends on the -X side of the retaining members 51D and 52D, respectively. Each of the tapered surfaces TP1 and TP2 is an inclined surface whose dimension in the Z direction decreases toward the end (-X side). Since the tapered surface is formed at the end of each of the retaining members 51D and 52D, the single-unit connectors 10 and 20 to which the retaining members 51D and 52D are attached are more easily inserted into the main body 310 of the housing 300 from the end on the -X side.

[0103] Figure 13 It shows Figure 1 FIG5 is a diagram showing a fifth variation of a battery. Figure 13 As shown, the battery 100E according to the fifth modification is basically similar in structure to Figure 7The battery 100A shown. The battery 100E includes holding members 51E and 52E instead of the holding members 51A and 52A ( Figure 7 ). Tapered surfaces TP1 and TP2 are formed at the ends on the -X side of the retaining members 51E and 52E, respectively. Each of the tapered surfaces TP1 and TP2 is an inclined surface that decreases in size in the Z direction toward the first end (-X side). Tapered surfaces TP3 and TP4 are formed at the ends on the +X side of the retaining members 51E and 52E, respectively. Each of the tapered surfaces TP3 and TP4 is an inclined surface that decreases in size in the Z direction toward the second end (+X side). Since the tapered surfaces are formed at each of the opposite ends of each of the retaining members 51E and 52E, the single-unit connectors 10 and 20 to which the retaining members 51E and 52E are attached are more easily inserted into the main body 310A of the housing 300A.

[0104] Figure 14 It shows Figure 1 FIG6 is a diagram of a sixth variation of a battery shown in FIG6. Figure 14 As shown, the battery 100F according to the sixth modification has a cross-sectional structure similar to that of the battery 100F of FIG. Figure 5 The battery 100 shown is the same. The battery 100F includes a retaining member 52F instead of the retaining member 52 ( Figure 5 ). The thermal conductivity of the holding member 52F is higher than that of the holding member 51. Specifically, the holding member 52F includes metal, and the holding member 51 includes resin. The holding member 52F may be formed entirely of metal. The holding member 51 may be formed entirely of resin. The holding member 52F is provided with protrusions P21F, P22F, and P23F, which are similar in shape to Figure 5 The convex parts P21, P22 and P23 shown. Figure 14 Not shown, but the retaining member 52F also includes Figure 6 The convex portion corresponding to the convex portion P24 shown in FIG. In the battery 100F, the thermal conductivity of the retaining member 52F located on the +Z side of each storage cell is high. Therefore, each storage cell is more easily removed from the outside of the +Z side of each storage cell (for example, the Figure 22 The temperature regulating device 800 shown is used for heating or cooling.

[0105] In battery 100F, retaining member 52F is made of metal, resulting in high thermal conductivity. Meanwhile, retaining member 51, made of resin, excels in toughness and formability, and therefore easily retains each of the power storage cells included in cell connectors 10 and 20. Retaining member 52F may include a main body formed of metal and protrusions (each of the above-mentioned protrusions) formed of resin. Retaining member 52F may have a structure in which particulate metal (e.g., a metal filler) is dispersed in a binder (e.g., a resin binder).

[0106] Figure 15 It shows Figure 1 FIG. 7 shows a seventh variation of the battery. Figure 15 As shown, the battery 100G according to the seventh variation has a cross-sectional structure similar to that of the battery 100G. Figure 14 The battery 100F shown is substantially the same. The battery 100G includes a retaining member 52G instead of the retaining member 52F ( Figure 14 ). The holding member 52G is constructed so that each of the protrusions described previously has been removed from the holding member 52F. The holding member 52G is a plate-shaped member made of metal (a main body portion formed of a flat plate made of metal), and has a higher thermal conductivity than the holding member 51 made of resin. According to this structure, each storage cell is more easily removed from the outside of the +Z side of each storage cell (for example, the side to be described later). Figure 22 The holding member 52G may have a structure in which particulate metal (eg, metal filler) is dispersed in a binder (eg, resin binder).

[0107] Figure 16 It shows Figure 1 FIG8 is a diagram of an eighth variation of a battery shown in FIG8. Figure 16 As shown, the battery 100H according to the eighth modification is basically similar in structure to Figure 1 Battery 100 shown. In battery 100H, the cell connectors 10 and 20 and retaining members 51 and 52 are formed integrally by being wound around a belt-like member 170. Member 170 is wound around each power storage cell and retaining members 51 and 52 located on opposite sides thereof, for example, with the X-axis defined as the rotation axis. Consequently, positional displacement of the cell connectors 10 and 20 and retaining members 51 and 52 is less likely. Furthermore, the cell connectors 10 and 20, to which the retaining members 51 and 52 are attached, are more easily inserted into the main body 310 of the housing 300.

[0108] Component 170 may be an adhesive tape having adhesive properties on two opposing surfaces or on one surface. To improve recyclability, a tape that can be peeled with a specific organic solvent may be used as component 170. Component 170 is not limited to a tape. Component 170 may be formed in a string-like form. Component 170 may also include a resin component, a heat-shrinkable component, an elastomer (e.g., a rubber tape), or the like.

[0109] Figure 17 It shows Figure 1 FIG. 9 is a diagram of a ninth variation of a battery. Figure 17 As shown, the battery 100I according to the ninth variation is substantially similar in structure to Figure 1 Battery 100 shown. In battery 100I, cell connectors 10 and 20 and retaining members 51 and 52 are formed into one piece by wrapping a sheet-like member 180. Member 180 wraps around the entirety of cell connectors 10 and 20 and retaining members 51 and 52, for example, with the Y axis defined as the axis of rotation. Therefore, positional displacement of cell connectors 10 and 20 and retaining members 51 and 52 is less likely. Furthermore, cell connectors 10 and 20, to which retaining members 51 and 52 are attached, are more easily inserted into body 310 of housing 300. Member 180 may be a resin film (e.g., a film containing vinyl chloride resin, polyvinylidene chloride, polyethylene, or polyolefin). Member 180 may be a heat shrink sheet.

[0110] Figure 18 It shows Figure 1 FIG10 is a diagram of a tenth variation of a battery shown in FIG10 . Figure 18 As shown, the battery 100J according to the tenth modification has a cross-sectional structure similar to that of the battery 100J. Figure 5 The battery 100 shown is basically the same. In the battery 100J, a gap is provided between the power storage cell (e.g., power storage cell 13) of the cell connector 10 and the power storage cell (e.g., power storage cell 23) of the cell connector 20 adjacent in the Y direction, and the retaining members 51J and 52J include protrusions P13J and P23J formed to enter the gap, respectively, instead of the protrusions P13 and P23 ( Figure 1 ). Each of the protrusions P13J and P23J has a size (size in the Y direction) corresponding to the interval between the storage cells and serves as a spacer. Each of the protrusions P13J and P23J restricts the movement of the storage cell 13 toward the -Y side and the movement of the storage cell 23 toward the +Y side, and suppresses the storage cells 13 and 23 from getting too close to each other, for example, as in Figure 18 As shown in .

[0111] Figure 19 It shows Figure 1 FIG. 11 shows an eleventh variation of the battery. Figure 19As shown, the cross-sectional structure of the battery 100K according to the eleventh modification is similar to Figure 18 The cross-sectional structure of the battery 100J shown is basically the same. In the battery 100K, each of the retaining members 51K and 52K does not include a protrusion ( Figure 18 ) (see projections P13J and P23J shown in FIG), however, metal plate 190 is positioned between the power storage cells, rather than the projections. The end of metal plate 190 on the -Z side contacts retaining member 51K, while the end of metal plate 190 on the +Z side contacts retaining member 52K. Metal plate 190 is, for example, an aluminum plate. However, this is not limiting and metal plate 190 may be formed from a metal other than aluminum. For example, metal plate 190 may be a copper plate or a stainless steel plate.

[0112] According to this configuration, for example, heat from each power storage cell is easily radiated to the outside of the housing 300 through the metal plate 190. Figure 22 When the temperature regulating device 800 shown heats each power cell, the heat is more easily conducted to each power cell through the metal plate 190. In one form of ensuring sufficient thermal conductivity, at least one end of the metal plate 190 in the Z direction does not need to be in contact with the retaining member.

[0113] It is not essential that a plurality of battery connectors be accommodated in the housing, and a single battery connector may be accommodated in the housing. Figure 20 It shows Figure 1 A diagram of a twelfth variant of a battery is shown. Figure 21 It is along Figure 20 Cross-sectional view along line XXI-XXI in FIG.

[0114] like Figure 20As shown, a battery 100L according to the twelfth variation includes a housing 300B and a cell connector 10 housed in the housing 300B. The cell connector 10 is housed in the housing 300B, but the cell connector 20 is not. The housing 300B includes a main body 310B and lids 320B and 330B. The main body 310B is a hollow housing with openings on its two opposite X-direction ends (the +X end face and the -X end face). The main body 310B houses a single cell connector (cell connector 10). The lid 320B closes the +X-side opening in the main body 310B. The lid 330B closes the -X-side opening in the main body 310B. The lids 320B and 330B are provided with electrode tabs T3B and T4B, respectively. Connection terminal T1B is provided in the storage cell 11 located at one end (+X side) of the cell connector 10 in the X direction, and connection terminal T2B is provided in the storage cell 14 located at the other end (-X side) of the cell connector 10 in the X direction. Electrode tabs T3B and T4B are electrically connected to the corresponding connection terminals T1B and T2B. Electrode tabs T3B and T4B function as, for example, the negative and positive electrode tabs, respectively. However, in the event of polarity reversal, electrode tab T4B can function as the negative electrode tab, and electrode tab T3B can function as the positive electrode tab.

[0115] like Figure 21 As shown, the retaining member 51L is formed essentially in a plate shape. In addition to a plate-shaped main body (first main body), the retaining member 51L includes projections P11L and P12L (first projections) that project from this main body toward the cell connection body 10. Each of the projections P11L and P12L projects toward the cell connection body 10 (the +Z side). The retaining member 52L is also formed essentially in a plate shape. In addition to a plate-shaped main body (second main body), the retaining member 52L includes projections P21L and P22L (second projections) that project from this main body toward the cell connection body 10. Each of the projections P21L and P22L projects toward the cell connection body 10 (the -Z side). Each of the retaining members 51L and 52L is made of an insulating material (e.g., resin) and is insulated. The holding members 51L and 52L hold each of the power storage cells (including Figure 21 The battery cell 13 shown in the figure is secured in a predetermined position. Specifically, protrusions P11L and P12L are located at the ends (corners) in the Y direction on the first surface of the battery cell and function as claws. This prevents positional displacement of the battery cell. Protrusions P21L and P22L are located at the ends (corners) in the Y direction on the second surface of the battery cell and function as claws. This prevents positional displacement of the battery cell.

[0116] It is not necessary for all the power storage cells included in the cell connection body to be held by the retaining member. For example, only power storage cells 12 and 13 of power storage cells 11 to 14 included in the cell connection body 10 may be retained by the retaining member, that is, only the central portion of the cell connection body 10 in the X direction may be retained. Only power storage cells 11 and 14 of power storage cells 11 to 14 included in the cell connection body 10 may be retained by the retaining member, that is, only the opposite ends of the cell connection body 10 in the X direction may be retained. The parallelepiped-shaped housing housing the cell connection body can be assembled by joining six plates forming six separately formed surfaces (surfaces F1 to F6) to each other (for example, by laser welding).

[0117] The battery 100 and 100A to 100L and their previously described variants can serve as an electrical storage device. A plurality of such batteries can be combined into a module.

[0118] Figure 22 is a diagram illustrating an exemplary power storage module including a plurality of batteries. Figure 22 The vertical, front-back, and left-right directions are shown as being orthogonal to one another. "Downward" corresponds to the vertical direction (the direction of gravity), and "upward" refers to the direction opposite thereto. The diagram showing the storage module as viewed from above shows the internal structure of the storage module 200.

[0119] Figure 22 The power storage module 200 shown includes a plurality of batteries 100. In the power storage module 200, the plurality of batteries 100 (see Figure 1 ) are arranged so that the surface on the +Z side of each battery faces upward, and the surface on the -Z side of each battery faces downward. For each of the plurality of batteries 100, it is possible to freely set Figure 1 and Figure 2 The illustrated cover 320 (surface on the +X side) faces either the left or right side. For example, all batteries 100 can be aligned in the battery module 200. Alternatively, the battery module 200 can include both batteries 100 with their covers 320 facing the right and batteries 100 with their covers 320 facing the left. Multiple batteries 100 can be electrically connected in series or in parallel. The battery module 200 functions as a battery storage device.

[0120] exist Figure 22In the example shown, a temperature regulating device 800 is provided on the upper surface of the storage module 200. The temperature regulating device 800 is configured to regulate the temperature of each of the plurality of batteries 100 included in the storage module 200. The temperature regulating device 800 may include at least one of a heater and a cooler. The temperature regulating device 800 is controlled by a control device 900. The control device 900 includes, for example, a processor and a storage device, and is connected to the connector 323 ( ) of each of the plurality of batteries 100 included in the storage module 200 via a signal line. Figure 1 ). The control device 900 receives a signal (e.g., a sensor detection value) from the connector 323 of each battery and sends a control command to the temperature adjustment device 800. The control device 900 can control the temperature adjustment device 800 based on the state of each battery. In the power storage module 200, another battery (any of the batteries 100A to 100L or a battery obtained by applying the various modifications described previously to its structure) can be used instead of the battery 100. The temperature adjustment device 800 can be provided on the lower surface of the power storage module 200.

[0121] Batteries 100 and 100A to 100L, and their previously described variations, and power storage module 200 can be mounted on, for example, a mobile object. Examples of mobile objects include automobiles (e.g., battery electric vehicles, hybrid electric vehicles), vehicles other than automobiles (e.g., ships, airplanes), mobile machines (e.g., agricultural machinery, construction machinery), and unmanned mobile objects (e.g., automated guided vehicles, robots). They can be used in any application for power storage devices, and the power storage devices can be used for stationary applications.

[0122] Figure 23 Is shown installed with Figure 22 Figure 1 shows an exemplary vehicle with a power storage module. Figure 23 The vehicle 2000 shown includes a battery pack 1000. The battery pack 1000 includes a plurality of power storage modules 200 and serves as a power storage device. The battery pack 1000 may also include Figure 22 Temperature adjustment device 800 is shown. Battery pack 1000 can be placed on or under the floor of vehicle 2000. Vehicle 2000 is a battery electric vehicle configured to travel using, for example, electricity output from battery pack 1000. Battery pack 1000 can supply electricity to a travel motor mounted on vehicle 2000. In battery pack 1000, power storage modules 200 are electrically connected to each other, for example, via bus bars. Battery pack 1000 can include at least one hundred power storage cells.

[0123] Various characteristics related to the above-described power storage device (characteristics described in the embodiment and modifications) can be freely combined and implemented. The power storage device can be applied to equipment other than vehicles.

[0124] Although the embodiments of the present disclosure have been described, it should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every aspect. The scope of the present disclosure is defined by the terms of the claims and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

Claims

1. An electric storage device comprising: case; One or more cell connecting bodies accommodated in the housing, each of the one or more cell connecting bodies including a plurality of power storage cells and a connecting portion electrically connecting the power storage cells to each other; as well as One or more holding members that hold at least one of the plurality of power storage cells between an inner surface of the case and at least one of the one or more cell connectors.

2. The power storage device according to claim 1, wherein For at least one of the one or more cell connected bodies, the one or more holding members include a first holding member that holds a first surface of each of two or more power storage cells included in the cell connected body.

3. The power storage device according to claim 2, wherein The first retaining member includes a plate-shaped first main body portion and one or more first protrusions protruding from the first main body portion toward the one or more cell connectors.

4. The power storage device according to claim 2, wherein For at least one of the one or more cell connectors, the one or more retaining members further include a second retaining member that retains a second surface opposite to the first surface of each of the two or more power storage cells included in the cell connector.

5. The power storage device according to claim 4, wherein The second retaining member includes a plate-shaped second main body portion and one or more second protrusions protruding from the second main body portion toward the one or more cell connectors.

6. The power storage device according to claim 4, wherein A flow path configured to discharge gas generated from at least one of the plurality of power storage cells is provided in at least one of the first and second holding members.

7. The power storage device according to claim 4, wherein At least one of the first holding member and the second holding member has a hollow structure.

8. The power storage device according to claim 4, wherein The thermal conductivity of the second holding member is higher than the thermal conductivity of the first holding member.

9. The power storage device according to claim 8, wherein The second holding member includes metal, and the first holding member includes resin.

10. The power storage device according to claim 4, wherein A tapered surface is formed at an end portion of each of the first holding member and the second holding member.

11. The power storage device according to claim 4, wherein The one or more single connecting bodies, the first holding member, and the second holding member are formed into one body by winding members in the form of wires, tapes, or sheets.

12. The power storage device according to claim 1, wherein The housing has a parallelepiped geometry, The housing is provided with four surfaces extending along the connection direction of each of the one or more monomer connectors and two surfaces covering the ends of the one or more monomer connectors. The four surfaces include a first opposing surface and a second opposing surface, wherein The first opposing surfaces are a pair of surfaces opposing each other, the second opposing surfaces are opposing surfaces having an area larger than that of the first opposing surfaces, and The retaining member is arranged on the first opposing surface. 13 . A vehicle comprising the power storage device according to claim 1 .

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