Power storage device and vehicle

Abstract

To improve the recyclability of a power storage device having a plurality of cell connections.SOLUTION: A power storage device (battery 100) comprises a first cell connection (cell connection 10) and a second cell connection (cell connection 20) that are electrically connected. The first cell connection comprises a plurality of first power storage cells (power storage cells 11 to 14) and a first connection section (connection section 2A) that electrically connects the first power storage cells to each other. The second cell connection comprises a plurality of second power storage cells (storage cells 21 to 24) and a second connection section (connection section 2B) that electrically connects the second power storage cells to each other. At least one of the plurality of first power storage cells is positioned to face one of the plurality of second power storage cells in the first direction. The power storage device further comprises holding members 51 to 54 between the opposing first power storage cell and second power storage cell, which hold the first power storage cell and second power storage cell.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a power storage device and a vehicle equipped with the power storage device. [Background technology]

[0002] JP 2023-502457 A (Patent Document 1) discloses a rectangular parallelepiped battery (electricity storage device) having a length L of 400 mm to 2500 mm and a ratio of length L to width H (L / H) of 4 to 21. [Prior art documents] [Patent documents]

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

[0004] In the energy storage device described in Patent Document 1, a plurality of electrode assembly sets (energy storage cells) connected in series and arranged in a row are disposed in a case (housing). Hereinafter, a series of a plurality of energy storage cells connected in a row will be referred to as a "cell series."

[0005] To improve the volumetric energy density of an energy storage device, it is advantageous to house multiple connected cell bodies in a case, rather than just one connected cell body. However, excessive movement of the multiple connected cell bodies within the case can easily damage the connections between the connected cell bodies and the connections between the energy storage cells. To address this issue, it is conceivable to fix each connected cell body to the inner surface of the case using a strong adhesive. However, in an energy storage device using this fixing method, when the energy storage device is disassembled after use and the parts are reused, it becomes difficult to separate the case and each connected cell body. For this reason, there is still room for improvement in terms of recyclability for energy storage devices that include multiple connected cell bodies.

[0006] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to improve the recyclability of an electricity storage device including a plurality of connected cell bodies. [Means for solving the problem]

[0007] According to an embodiment of a first aspect of the present disclosure, there is provided a power storage device as described below.

[0008] (Item 1) The energy storage device includes a first cell connected body and a second cell connected body that are electrically connected. The first cell connected body includes a plurality of first energy storage cells and a first connection portion that electrically connects the first energy storage cells to each other. The second cell connected body includes a plurality of second energy storage cells and a second connection portion that electrically connects the second energy storage cells to each other. At least one of the plurality of first energy storage cells is arranged to face one of the plurality of second energy storage cells in a first direction. The energy storage device further includes a holding member between the facing first energy storage cell and second energy storage cell that holds the first energy storage cell and the second energy storage cell.

[0009] According to the above configuration, the first and second energy storage cells are held by the holding members, making them less likely to move. This makes it possible to omit an adhesive for fixing the first and second cell connected bodies or to weaken the adhesive strength of the adhesive used. This improves the recyclability of the energy storage device. Note that each connection portion in each of the first and second cell connected bodies may be a conductive member. Each connection portion may connect electrodes of adjacent energy storage cells. The first and second cell connected bodies may be electrically connected by connecting an electrode of the first and second cell connected bodies to an electrode of the second cell connected body (for example, by contacting the electrodes or connecting the electrodes via a conductive member). The positive electrode of the first and second cell connected bodies may be connected to the negative electrode of the second cell connected body. The positive electrode of the first and second cell connected bodies may be connected to the positive electrode of the second cell connected body. The first and second cell connected bodies may be connected in series or in parallel.

[0010] (Item 2) In the energy storage device described in item 1, the holding member has a main body portion located between the first energy storage cell and the second energy storage cell, a first cell holding portion extending from the main body portion toward the first energy storage cell and holding the first energy storage cell, and a second cell holding portion extending from the main body portion toward the second energy storage cell and holding the second energy storage cell.

[0011] The holding member makes it easier to properly hold the first and second energy storage cells.

[0012] (Item 3) In the energy storage device described in item 2, the main body is located between the first and second energy storage cells in a second direction perpendicular to the first direction. The first cell holding unit holds the first energy storage cell in a third direction perpendicular to both the first and second directions. The second cell holding unit holds the second energy storage cell in the third direction.

[0013] The holding member sandwiches the respective electric storage cells, thereby enabling precise restriction of movement of each of the first electric storage cell and the second electric storage cell.

[0014] (Item 4) In the energy storage device described in any one of Items 1 to 3, the first cell connected body and the second cell connected body are aligned in a second direction perpendicular to the first direction, and the holding member has an X-shaped cross section perpendicular to the second direction.

[0015] The holding member makes it easier to properly hold the first and second storage cells even if the gap between the first and second storage cells is narrow.

[0016] (Item 5) In the energy storage device described in any one of Items 1 to 4, the holding member has a first resin member that holds the first energy storage cell, a second resin member that holds the second energy storage cell, and a metal plate located between the first resin member and the second resin member.

[0017] The holding member can appropriately hold each energy storage cell with the resin member, while increasing thermal conductivity between each energy storage cell and its surroundings with the metal plate. For example, heat from each energy storage cell is more easily released through the metal plate. Furthermore, when each energy storage cell is heated, heat is more easily transferred to each energy storage cell through the metal plate.

[0018] (Item 6) The power storage device according to any one of Items 1 to 5 further includes a circuit board that detects smoke. The holding member is provided with a flow path that guides smoke emitted from at least one of the opposing first and second power storage cells to the circuit board.

[0019] According to the above configuration, it becomes easier to detect smoke emitted from at least one of the first and second storage cells held by the holding member.

[0020] (Item 7) The energy storage device according to any one of Items 1 to 6 further includes a circuit board that detects smoke, and a spacer positioned between adjacent energy storage cells in the first cell assembly and / or between adjacent energy storage cells in the second cell assembly, the spacer having a flow path that guides smoke emitted from at least one of the adjacent energy storage cells to the circuit board.

[0021] According to the above configuration, it becomes easier to detect smoke emitted from at least one of two adjacent storage cells sandwiching the spacer therebetween.

[0022] (Item 8) In the energy storage device according to any one of items 1 to 7, each of the plurality of first energy storage cells is arranged to face one of the plurality of second energy storage cells in the first direction, and a holding member is provided for each pair of facing first and second energy storage cells.

[0023] According to the above configuration, all of the first storage cells included in the first connected cell body can be held by the holding member.

[0024] According to an embodiment of the second aspect of the present disclosure, there is provided a vehicle as follows.

[0025] (Item 9) The vehicle includes the power storage device according to any one of Items 1 to 8.

[0026] In the vehicle, the recyclability of the power storage device including a plurality of connected cell bodies is improved. [Effects of the Invention]

[0027] According to the present disclosure, it is possible to improve the recyclability of an electricity storage device including a plurality of cell connected bodies. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a diagram illustrating a configuration of a power storage device according to an embodiment of the present disclosure. [Figure 2] 2 is an enlarged perspective view showing the inside of a case of the electricity storage device shown in FIG. 1. FIG. [Figure 3] 2 is a diagram for explaining the configuration of each cell connected body shown in FIG. 1. FIG. [Figure 4] 2 is an exploded perspective view of a storage cell included in each of the cell connected bodies shown in FIG. 1. FIG. [Figure 5] FIG. 2 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 2 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 2 is a diagram showing a first modified example of the power storage device shown in FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. [Figure 9] 6A and 6B are diagrams showing modified examples of the structure of the holding member shown in FIG. 5. [Figure 10] 10 is a diagram showing a modified example of the holding member shown in FIG. 9. FIG. [Figure 11] 1. FIG. 5 is a diagram showing a second modified example of the power storage device shown in FIG. [Figure 12] FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. [Figure 13] 1. FIG. 6 is a diagram showing a third modified example of the power storage device shown in FIG. [Figure 14] FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG. [Figure 15] 1. FIG. 6 is a diagram showing a fourth modified example of the power storage device shown in FIG. [Figure 16] FIG. 16 is a cross-sectional view taken along line XVI-XVI in FIG. [Figure 17] FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. [Figure 18] FIG. 7 is a diagram showing an example in which a flow path is formed in the spacer shown in FIG. 6. [Figure 19] 11 is a diagram showing an example in which a flow path is formed in the holding member shown in FIG. 10. FIG. [Figure 20] 2 is a diagram showing an example of an electricity storage module produced by combining a plurality of the batteries shown in FIG. 1. FIG. [Figure 21] 21 is a diagram showing an example of a vehicle equipped with the power storage module shown in FIG. 20. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0029] Embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, identical or corresponding parts are designated by the same reference numerals, and their description will not be repeated. In each of the drawings used below, of the mutually orthogonal X-axis, Y-axis, and Z-axis, the X-axis indicates a first in-plane direction of the battery (e.g., the length direction), the Y-axis indicates a second in-plane direction of the battery (e.g., the width direction), and the Z-axis indicates the height direction of the battery. Hereinafter, the directions indicated by the arrows of the X-axis, Y-axis, and Z-axis will be indicated with a "+" and the opposite directions will be indicated with a "-".

[0030] Fig. 1 is a diagram for explaining the configuration of the electricity storage device according to this embodiment. "Case internal configuration diagram-Z1" in Fig. 1 is a diagram of the contents of the case as seen from the +Z side. "Case internal configuration diagram-Z2" in Fig. 1 is a diagram of the contents of the case as seen from the -Z side.

[0031] The power storage device according to this embodiment is a battery 100 shown in FIG. 1. The 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 an LFP battery that uses lithium iron phosphate as the positive electrode active material, or a ternary battery that uses NMC (nickel-manganese-cobalt) as the positive electrode active material. The secondary battery may be a liquid secondary battery or an all-solid-state secondary battery. As will be described in detail later, the battery 100 includes multiple storage cells that each function as a secondary battery. The battery 100 may include only storage cells of the same type (e.g., only LFP batteries) or may include storage cells of different types (e.g., an LFP battery and a ternary battery).

[0032] The battery 100 includes a rectangular parallelepiped case 300. The length (dimension in the X direction) of the case 300 is longer than the width (dimension in the Y direction) of the case 300. The length of the case 300 may be 250 mm or more and 5000 mm or less, for example, approximately 1000 mm. The width of the case 300 may be 10 mm or more and 1250 mm or less, for example, approximately 50 mm. The ratio of the length of the case 300 to the width of the case 300 may be 4 or more and 25 or less. The height (dimension in the Z direction) of the case 300 may be 10 mm or more and 1250 mm or less, for example, approximately 100 mm. However, the dimensions of the case 300 are not limited to those described above.

[0033] The case 300 includes a main body 310 and a lid 320. The main body 310 is, for example, a cylindrical housing with a bottom and an opening on the end face on the +X side, and houses the cell assemblies 10 and 20. The lid 320 is a plate-like member (cover member) having an outer shape corresponding to the opening of the main body 310, and closes the opening on the +X side of the main body 310. The main body 310 and the lid 320 may be made of the same material or different materials. For example, metal can be used as the material constituting each of the main body 310 and the lid 320. The case 300 may be made of aluminum. However, these materials can be changed as appropriate. For example, the lid 320 may be made of an insulating material.

[0034] The cell connected body 10 includes four energy storage cells 11 to 14 and three connection parts 2A that electrically connect the energy storage cells to each other. The energy storage cells 11 to 14 are connected in a row in the X direction inside the case 300. The cell connected body 20 includes four energy storage cells 21 to 24 and three connection parts 2B that electrically connect the energy storage cells to each other. The energy storage cells 21 to 24 are connected in a row in the X direction inside the case 300. In this manner, the cell connected body 10 and the cell connected body 20 are arranged parallel to the X direction. Each energy storage cell is configured to be able to store electricity. In this embodiment, the cell connected body 10, the cell connected body 20, the Y direction, the X direction, and the Z direction correspond to examples of the "first cell connected body," the "second cell connected body," the "first direction," the "second direction," and the "third direction" according to the present disclosure, respectively. Moreover, the power storage cells 11 to 14, the power storage cells 21 to 24, the connection portion 2A, and the connection portion 2B correspond to examples of the "first power storage cell," "second power storage cell," "first connection portion," and "second connection portion" according to the present disclosure, respectively.

[0035] The cell assembly 10 and the cell assembly 20 are electrically connected within the case 300 of the battery 100. Specifically, as shown in FIG. 1, the -X side end of the cell assembly 10 (the energy storage cell 14) and the -X side end of the cell assembly 20 (the energy storage cell 24) are electrically connected within the case 300 via, for example, a U-shaped connection portion 2C. The connection portion 2C basically has the same structure as the connection portion 2A or 2B, except that it is formed in a different shape (the connection portion 2C has a U-shaped cross section, while the connection portions 2A and 2B each have an I-shaped cross section). The connection portion 2C may be an integrally molded product or a composite of a plurality of separately molded parts. For example, the connection portion 2C may be formed by connecting a protrusion 144B (FIG. 3) protruding from the energy storage cell 14 and a protrusion 144B (FIG. 3) protruding from the energy storage cell 24 via a conductive material (beam portion). The protrusion 144B will be described later.

[0036] The cell connected bodies 10 and 20 are arranged so that the positions of the storage cells and the connection parts are aligned. The storage cells 11, 12, 13, and 14 included in the cell connected body 10 overlap with the storage cells 21, 22, 23, and 24 included in the cell connected body 20 in the Y direction, respectively. That is, all the storage cells included in the cell connected body 10 are arranged so as to face any of the storage cells included in the cell connected body 20 in the Y direction.

[0037] The case 300 further houses holding members 51 to 54. The holding member 51 is disposed between the opposing storage cells 11 and 21 and holds the storage cells 11 and 21. The holding member 52 is disposed between the opposing storage cells 12 and 22 and holds the storage cells 12 and 22. The holding member 53 is disposed between the opposing storage cells 13 and 23 and holds the storage cells 13 and 23. The holding member 54 is disposed between the opposing storage cells 14 and 24 and holds the storage cells 14 and 24. In this way, in the battery 100, a holding member is provided for each combination of storage cells that face each other in the Y direction. With this configuration, it becomes possible for all storage cells housed in the case 300 to be held by the holding members. The holding members 51 to 54 will be described in detail later (see FIG. 5).

[0038] The case 300 further accommodates a plurality of spacers 60 (for example, three spacers 60). Each of the plurality of spacers 60 overlaps with the connection portions 2A and 2B in the Y direction. Specifically, each of the plurality of spacers 60 is located between the connection portions 2A and 2B in the Y direction. Adjacent energy storage cells in the connected cell body 10 face each other in the X direction with the spacer 60 sandwiched therebetween. Adjacent energy storage cells in the connected cell body 20 also face each other in the X direction with the spacer 60 sandwiched therebetween. The spacer 60 is a spacer common to the connected cell bodies 10 and 20, and is located between adjacent energy storage cells in the connected cell body 10 and between adjacent energy storage cells in the connected cell body 20. The spacers 60 will be described in detail later (see FIG. 6).

[0039] The +X side end (energy storage cell 11) of the cell connected body 10 is connected to the lid body 320 via a connection terminal T1. The +X side end (energy storage cell 21) of the cell connected body 20 is connected to the lid body 320 via a connection terminal T2. Fig. 2 is an enlarged perspective view showing the +X side end of the cell connected bodies 10, 20 with the holding members 51 to 54 and the spacer 60 removed.

[0040] The cover 320 has a sealing hole 321, an external terminal 322, and a connector 323. The sealing hole 321 may be a pressure adjustment hole that adjusts the pressure inside the case 300. The sealing hole 321 has a sealing structure, for example, made of a metal cap (outside the case) and a sealing member (inside the case). This sealing structure ensures airtightness inside the case 300. The external terminal 322 includes an electrode tab 322A joined (e.g., laser welded) to the connection terminal T1 ( FIG. 1 ) of the cell assembly 10, and an electrode tab 322B joined (e.g., laser welded) to the connection terminal T2 ( FIG. 1 ) of the cell assembly 20. The electrode tabs 322A and 322B are electrically connected to the energy storage cells 11 and 21, respectively. Each of the electrode tabs 322A and 322B may have an insulating sealing structure made of ceramic, for example, around the periphery of the electrode. In this embodiment, the electrode tabs 322A and 322B function as a negative electrode tab and a positive electrode tab, respectively. However, the present invention is not limited to this, and the polarities may be reversed, with electrode tab 322B being a negative electrode tab and electrode tab 322A being a positive electrode tab. Connector 323 includes, for example, an output terminal that outputs a detection signal indicating a state inside case 300 (for example, the temperature of each power storage cell) detected by one or more sensors inside case 300 to the outside of the case, and an input terminal that inputs a control signal from the outside of the case to one or more devices inside case 300. For example, a temperature sensor may be provided for each power storage cell inside case 300.

[0041] The cell connected bodies 10 and 20 are inserted into the main body 310 with the holding members 51 to 54 and the spacer 60 attached. Holding each of the energy storage cells by the holding members 51 to 54 makes it easier to insert the cell connected bodies 10 and 20 into the main body 310. The holding members 51 to 54 and the spacer 60 may be attached before or after welding of the connection portions 2A and 2B (for example, welding of the protrusions 144A and 144B, which will be described later). After the cell connected bodies 10 and 20 are inserted into the main body 310 together with the holding members 51 to 54 and the spacer 60, the main body 310 and the lid body 320 are joined together. The main body 310 and the lid body 320 are welded together, for example, by laser.

[0042] At least one of a pressure adjustment hole and a gas exhaust valve may be provided on the end surface on the -X side of main body 310. Furthermore, an opening may be formed on the end surface on the -X side of main body 310, similar to the end surface on the +X side of main body 310. Then, a lid formed separately from cylindrical main body 310 may be joined (for example, laser welded) to the opening.

[0043] In this embodiment, the cell connected body 10 and the cell connected body 20 basically have the same configuration. Therefore, hereinafter, when there is no need to distinguish between the energy storage cells 11 to 14 and 21 to 24, they will be referred to as "energy storage cells 1," and when there is no need to distinguish between the connection parts 2A and 2B, they will be referred to as "connection part 2."

[0044] FIG. 3 is a diagram illustrating the configuration of each of the cell connected bodies 10 and 20. As shown in FIG. 3, each cell connected body includes four energy storage cells 1. Connection portions 2 are provided between adjacent energy storage cells 1, and the connection portions 2 electrically connect the energy storage cells 1. Each cell connected body is configured such that the energy storage cells 1 and the connection portions 2 are arranged alternately. In each of the cell connected bodies 10 and 20, the energy storage cells 1 are connected to each other via the connection portions 2. The rigidity of the connection portions 2 is lower than the rigidity of the energy storage cells 1. The energy storage cells 11 to 14 and 21 to 24 are configured from the same energy storage cells 1. By forming the cell connected bodies 10 and 20 using common energy storage cells 1, the manufacture of the battery 100 becomes easier and the manufacturing cost can be reduced.

[0045] However, the configurations of the cell connected bodies 10 and 20 are not limited to the above. Each cell connected body may include energy storage cells of different dimensions or shapes. The number of energy storage cells housed in the case 300 is not limited to eight and can be changed as appropriate. The number of energy storage cells included in each cell connected body may be less than four, may be between five and nineteen, or may be twenty or more.

[0046] In this embodiment, the energy storage cell 1 is a laminate cell having one or more wound bodies. In a laminate cell, one or more wound bodies that function as electrode bodies are covered with a laminate exterior body. In FIG. 2, the energy storage cell is illustrated without the laminate exterior 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 interposed therebetween. Each of the positive electrode sheet and the negative electrode sheet includes an electrode foil and an active material layer.

[0047] Fig. 4 is an exploded perspective view of the energy storage cell 1. The structures of the energy storage cell 1 and the connection portion 2 will be described below with reference to the cross-sectional view in Fig. 3 (XY cross-sectional view of the periphery of the connection portion 2) and Fig. 4.

[0048] As shown in FIG. 4, the energy storage cell 1 includes two wound bodies 110A and 110B, spacers 120A and 120B, terminal members 130A and 130B, and covers 150A and 150B.

[0049] The wound bodies 110A and 110B have coated portions 111A and 111B, electrode tabs 112A and 112B, and electrode tabs 113A and 113B, respectively. Each of the coated portions 111A and 111B is a region of the electrode foil on the positive electrode sheet or the negative electrode sheet where an active material layer is provided. Each of the electrode tabs 112A, 112B, 113A, and 113B is a region of the positive electrode sheet or the negative electrode sheet where the electrode foil is exposed (an uncoated portion where no active material layer is provided). The electrode tabs 112A and 112B are located at the +X side ends of the wound bodies 110A and 110B, respectively. The electrode tabs 113A and 113B are located at the −X side ends of the wound bodies 110A and 110B, respectively.

[0050] The electrode tabs 112A and 112B are arranged to overlap in the Y direction, and a spacer 120A and a terminal member 130A are provided between the electrode tabs 112A and 112B (see FIG. 3). The electrode tabs 113A and 113B are arranged to overlap in the Y direction, and a spacer 120B and a terminal member 130B are provided between the electrode tabs 113A and 113B (see FIG. 3).

[0051] Each of the spacers 120A, 120B contains an insulating material (e.g., synthetic resin) and is insulating. Each of the spacers 120A, 120B has a shape in which the dimension in the Y direction increases with increasing distance from the coated portions 111A, 111B (see FIG. 3). The terminal member 130A is connected to an end face on the +X side of the spacer 120A. The terminal member 130B is connected to an end face on the -X side of the spacer 120B. Each of the terminal members 130A, 130B contains a conductive material (e.g., a metal such as aluminum or copper) and is conductive. The wound body 110A and the wound body 110B are joined to each other (e.g., laser welded) via the terminal members 130A and 130B.

[0052] Each of the current collecting terminals 140A, 140B is a component that constitutes a part of the connection portion 2. The current collecting terminals 140A, 140B have support portions 142A, 142B and protrusions 144A, 144B, respectively. One of the current collecting terminals 140A and 140B functions as a positive electrode current collecting terminal, and the other functions as a negative electrode current collecting terminal. In one example, the positive electrode current collecting terminal is made of aluminum, and the negative electrode current collecting terminal is made of copper.

[0053] Each of the current collecting terminals 140A, 140B is formed in an L-shape. Each of the support portions 142A, 142B is formed in a plate shape on the YZ plane, and each of the protrusions 144A, 144B is formed in a plate shape on the XZ plane. The support portion 142A and the protrusion 144A may be formed separately and then joined together, or may be formed in an integrated state by bending. The support portion 142B and the protrusion 144B may also be formed separately and then joined together, or may be formed in an integrated state by bending. The support portion 142A is joined (e.g., laser welded) to the end surface on the +X side of the terminal member 130A (see FIG. 3). The support portion 142B is joined (e.g., laser welded) to the end surface on the -X side of the terminal member 130B (see FIG. 3).

[0054] The cover 150A covers the end portion of the energy storage cell 1 on the +X side (including the electrode tabs 112A and 112B). However, 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 toward the +X side of the energy storage cell 1 (see FIG. 3). The cover 150B covers the end portion of the energy storage cell 1 on the -X side (including the electrode tabs 113A and 113B). However, 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 toward the -X side of the energy storage cell 1 (see FIG. 3).

[0055] As shown in Fig. 3, at the connection portion 2, of two adjacent energy storage cells 1, the protruding portion 144A of one energy storage cell 1 is joined (for example, by laser welding) to the protruding portion 144B of the other energy storage cell 1. The welded portion may be protected with tape or the like. Although not shown in Fig. 4, a laminated outer casing 160 shown in Fig. 3 is provided on the surfaces of the two wound bodies 110A and 110B. The laminated outer casing 160 is, for example, a laminated film, and is provided on the surfaces of the energy storage cells 1.

[0056] The above-described configuration is merely one example of the configuration of the energy storage cell 1 and can be modified as appropriate. For example, the number of wound bodies included in the energy storage cell 1 is not limited to two, and may be one, three, or more. Furthermore, a laminate (for example, a laminate in which a positive electrode sheet and a negative electrode sheet are laminated with a separator interposed therebetween) may be used as the electrode body instead of the wound body.

[0057] Fig. 5 is a cross-sectional view taken along line VV in Fig. 1. As shown in Fig. 5, an insulating layer 310a containing a resin such as PET (polyethylene terephthalate) is provided on the inner surface of main body 310 of case 300. This electrically insulates case 300 from the components inside case 300. However, in a case (housing) that ensures sufficient insulation, insulating layer 310a can be omitted. Hereinafter, the end face on the +Z side of each storage cell may be referred to as the "upper face," and the end face on the -Z side of each storage cell may be referred to as the "lower face."

[0058] 5, the holding member 53 has an X-shaped cross section (YZ cross section) perpendicular to the X direction. Due to this shape, the holding member 53 can sandwich each of the power storage cells 13 and 23 that face each other in the Y direction. The holding member 53 holds both the upper and lower surfaces of the power storage cell 13 (first power storage cell), and also holds both the upper and lower surfaces of the power storage cell 23 (second power storage cell).

[0059] Specifically, the holding member 53 has a first holding portion 531, a second holding portion 532, and a main body portion 533. The main body portion 533 is located between the first holding portion 531 and the second holding portion 532 in the Z direction and functions as a connector connecting these holding portions. The main body portion 533 is also located between the energy storage cell 13 and the energy storage cell 23 in the Y direction and functions as a spacer that maintains a constant distance between these energy storage cells. An X-direction groove P1 is formed in each of the -Z side end face of the first holding portion 531 and the +Z side end face of the second holding portion 532. The groove P1 may act to release pressure.

[0060] The +Z side surface of the first holding portion 531 functions as a holding surface and is in contact with the lower surfaces of the power storage cells 13 and 23. The -Z side surface of the second holding portion 532 functions as a holding surface and is in contact with the upper surfaces of the power storage cells 13 and 23. The portions of the first holding portion 531 and the second holding portion 532 on the +Y side of the main body portion 533 correspond to first cell holding portions extending from the main body portion 533 toward the power storage cells 13 and hold the power storage cells 13 (more specifically, sandwich the power storage cells 13 in the Z direction). The portions of the first holding portion 531 and the second holding portion 532 on the -Y side of the main body portion 533 correspond to second cell holding portions extending from the main body portion 533 toward the power storage cells 23 and hold the power storage cells 23 (more specifically, sandwich the power storage cells 23 in the Z direction).

[0061] The holding member 53 contains an insulating material (e.g., resin) and has insulating properties. The holding member 53 is, for example, an integrally molded product. The first holding portion 531, the second holding portion 532, and the main body portion 533 are seamlessly integrated. However, this structure is not limiting, and each portion constituting the holding member 53 may be molded separately and then joined together. In this embodiment, the first holding portion 531, the second holding portion 532, and the main body portion 533 are each made of resin, but these portions may also be made of different materials.

[0062] Although FIG. 5 shows only the structure of the holding member 53 as a representative example, the other holding members (holding members 51, 52, 54) also have the same structure as the holding member 53.

[0063] 6 is a cross-sectional view taken along line VI-VI in FIG. 1. The spacer 60 shown in FIG. 6 has, for example, a rectangular parallelepiped outer shape and is positioned between adjacent energy storage cells 12 and 13 in the cell assembly 10. The spacer 60 contains an insulating material (for example, resin) and has insulating properties. The -Z side surface of the spacer 60 contacts the inner surface (insulating layer 310a) of the main body 310 of the case 300. The dimension of the spacer 60 in the Z direction is set corresponding to the dimension of each energy storage cell. The +Z side surface of the spacer 60 is substantially flush with the upper surfaces of the energy storage cells 12 and 13. At least one of a heat management system (for example, a heater and / or a temperature sensor), a gas exhaust system (for example, a gas flow path and / or a pressure sensor), an FPC (flexible printed circuit board), and wiring connected to the connector 323 may be provided in a region R1 between the +Z side surface of the spacer 60 and the inner surface (top surface) of the main body 310. The devices and / or sensors provided in the region R1 may be connected to the connector 323 of the cover 320.

[0064] The dimension of the spacer 60 in the X direction is set corresponding to the interval between two adjacent power storage cells. The spacer 60 acts to keep the interval between the power storage cells 12 and 13 constant. Specifically, the spacer 60 restricts movement of the power storage cell 12 toward the −X side and movement of the power storage cell 13 toward the +X side, thereby preventing the power storage cells 12 and 13 from coming too close to each other.

[0065] While Fig. 6 shows only the spacer 60 located between the energy storage cells 12 and 13 as a representative example, the other spacers 60 shown in Fig. 1 also have the structure shown in Fig. 6. The shape of the spacer 60 can be changed as appropriate. The spacer 60 may be formed, for example, in a cylindrical shape or a prismatic shape other than a rectangular parallelepiped (such as a hexagonal prism or an octagonal prism).

[0066] The holding members 51-54 and the spacer 60 may be fixed to the case 300 with adhesive or double-sided tape. However, not using this type of fixing method tends to increase the recyclability of the energy storage device. The battery 100 (energy storage device) according to this embodiment includes holding members between the opposing first and second energy storage cells to hold the first and second energy storage cells. Each of the holding members 51-54 functions as such a holding member. In the battery 100 having such a configuration, the first and second energy storage cells are held by the holding members, making them less likely to move. This makes it possible to omit the adhesive used to fix the first and second cell connected bodies or to weaken the adhesive strength of the adhesive used. This improves the recyclability of the energy storage device. Even if the cell connected bodies 10 and 20 move within the case 300 while held by the holding members 51-54, the positional relationship between the energy storage cells remains unchanged, and therefore the connection portions 2A-2C are less likely to be damaged.

[0067] It is not essential to provide a holding member for every combination of storage cells facing each other in the Y direction. For example, among the holding members 51 to 54, the holding members 52 and 53 may be omitted, and only the two end portions in the X direction of the cell connected bodies 10 and 20 may be held by the holding members 51 and 54. Furthermore, among the holding members 51 to 54, the holding members 51 and 54 may be omitted, and only the central portions in the X direction of the cell connected bodies 10 and 20 may be held by the holding members 52 and 53.

[0068] Fig. 7 is a diagram showing a first modified example of the battery shown in Fig. 1. Fig. 8 is a cross-sectional view taken along line VIII-VIII in Fig. 7.

[0069] As shown in Fig. 7, battery 100A according to the first modification basically has the same configuration as battery 100 shown in Fig. 1. However, battery 100A employs resin members 51A and 51B and a metal plate 70 instead of holding member 51 (Fig. 1), resin members 52A and 52B and a metal plate 70 instead of holding member 52 (Fig. 1), resin members 53A and 53B and a metal plate 70 instead of holding member 53 (Fig. 1), and resin members 54A and 54B and a metal plate 70 instead of holding member 54 (Fig. 1).

[0070] As shown in FIG. 8, the resin member 53A has a C-shaped cross section (YZ cross section) perpendicular to the X direction. This shape allows the resin member 53A to sandwich the energy storage cell 13. Specifically, the resin member 53A has a first holding portion 531A, a second holding portion 532A, and a main body portion 533A. The portions (corners) where the first holding portion 531A and the second holding portion 532A are connected to the main body portion 533A may be chamfered. The main body portion 533A is located between the first holding portion 531A and the second holding portion 532A in the Z direction and functions as a connection portion connecting these holding portions. Furthermore, the main body portion 533A is located between the energy storage cell 13 and the energy storage cell 23 in the Y direction. The first holding portion 531A and the second holding portion 532A correspond to a first cell holding portion extending from the main body portion 533A toward the storage cell 13, and hold (more specifically, sandwich) the storage cell 13. The resin member 53A holds both the upper and lower surfaces of the storage cell 13 (first storage cell).

[0071] The resin member 53B has a C-shaped cross section perpendicular to the X direction (YZ cross section) that is oriented in the opposite direction to the resin member 53A. This shape enables the resin member 53B to sandwich the energy storage cell 23. Specifically, the resin member 53B has a first holding portion 531B, a second holding portion 532B, and a main body portion 533B. The portions (corners) where the first holding portion 531B and the second holding portion 532B are connected to the main body portion 533B may be chamfered. The main body portion 533B is located between the first holding portion 531B and the second holding portion 532B in the Z direction and functions as a connection portion that connects these holding portions. Furthermore, the main body portion 533B is located between the energy storage cell 13 and the energy storage cell 23 in the Y direction. The first holding portion 531B and the second holding portion 532B correspond to a second cell holding portion extending from the main body portion 533B toward the storage cell 23, and hold (more specifically, sandwich) the storage cell 23. The resin member 53B holds both the upper and lower surfaces of the storage cell 23 (second storage cell).

[0072] Each of the resin members 53A, 53B is made of resin. The metal plate 70 is located between the resin members 53A and 53B in the Y direction. Both ends of the metal plate 70 in the Z direction are in contact with the inner surface of the main body 310 of the case 300. The metal plate 70 is, for example, an aluminum plate. However, the metal plate 70 is not limited to this and may be made of a metal other than aluminum. The metal plate 70 may be, for example, a copper plate or a stainless steel plate.

[0073] The metal plate 70 is joined (e.g., welded) to each of the resin members 53A and 53B, and these resin members 53A and 53B and the metal plate 70 function as holding members that hold the energy storage cells 13 and 23 that face each other in the Y direction. Such holding members can appropriately hold each energy storage cell with the resin members 53A and 53B, while the metal plate 70 can increase thermal conductivity between each energy storage cell and its surroundings. For example, heat from each energy storage cell is more easily released to the outside of the case 300 (e.g., a temperature adjustment device 800 shown in FIG. 20 , which will be described later) through the metal plate 70. Furthermore, when each energy storage cell is heated from the outside of the case 300 (e.g., a temperature adjustment device 800 shown in FIG. 20 , which will be described later), heat is more easily transferred to each energy storage cell through the metal plate 70. The metal plate 70 being in contact with the case 300 increases thermal conductivity between each energy storage cell and the case 300. However, in a configuration in which sufficient thermal conductivity is ensured without relying on such a configuration, at least one end of the metal plate 70 in the Z direction does not need to be in contact with the case 300.

[0074] Figure 8 shows only the retaining member (resin members 53A, 53B and metal plate 70) located between storage cells 13 and 23 as a representative example, but the retaining member (resin members 51A, 51B and metal plate 70) located between storage cells 11 and 21, the retaining member (resin members 52A, 52B and metal plate 70) located between storage cells 12 and 22, and the retaining member (resin members 54A, 54B and metal plate 70) located between storage cells 14 and 24 also have the structure shown in Figure 8.

[0075] Fig. 9 is a diagram showing a modified example of the structure of the holding member shown in Fig. 5. The holding member 50 shown in Fig. 9 has a first holding portion 501, a second holding portion 502, and a main body portion 503. The first holding portion 501, the second holding portion 502, and the main body portion 503 basically have the same configurations as the first holding portion 531, the second holding portion 532, and the main body portion 533 shown in Fig. 5, respectively. However, the first holding portion 501 and the second holding portion 502 each have a claw portion P2 at both ends in the Y direction.

[0076] The portions (first cell holding portions) of the first holding portion 501 and the second holding portion 502 on the +Y side of the main body portion 503 hold the energy storage cell 1 (first energy storage cell) using the holding surfaces and the claw portions P2. Such first cell holding portions clamp the first energy storage cell in the Z direction with the holding surfaces and suppress movement of the first energy storage cell outward (to the +Y side) with the claw portions P2. The claw portions P2 of the first cell holding portion catch on the first energy storage cell and act to hold the first energy storage cell in a predetermined position.

[0077] The portions (second cell holding portions) of the first holding portion 501 and the second holding portion 502 on the -Y side of the main body portion 503 hold the energy storage cell 1 (second energy storage cell) using the holding surfaces and the claw portions P2. Such second cell holding portions clamp the second energy storage cell in the Z direction with the holding surfaces and suppress movement of the second energy storage cell outward (to the -Y side) with the claw portions P2. The claw portions P2 of the second cell holding portion catch on the second energy storage cell and act to hold the second energy storage cell in a predetermined position.

[0078] For example, in battery 100, holding member 50 having the above-described configuration may be used in place of at least one of holding members 51 to 54. Note that no groove (groove P1 shown in FIG. 5) is formed in each of first holding portion 501 and second holding portion 502 shown in FIG. 9. However, this is not limiting, and groove P1 may be formed in each of first holding portion 501 and second holding portion 502.

[0079] FIG. 10 is a diagram showing a modified example of the holding member shown in FIG. 9. The holding member 50A shown in FIG. 10 has a structure in which the second holding portion 502 is removed from the holding member 50 shown in FIG. 9. The holding member 50A has a T-shaped cross section (YZ cross section) perpendicular to the X direction. In the holding member 50A, a portion of the first holding portion 501 on the +Y side of the main body 503 (first cell holding portion) holds the storage cell 1 (first storage cell) with the holding surface and the claw portion P2. In addition, a portion of the first holding portion 501 on the −Y side of the main body 503 (second cell holding portion) holds the storage cell 1 (second storage cell) with the holding surface and the claw portion P2. A space (region R2) is formed between the inner surface (top surface) of the main body 310 of the case 300 and the +Z side surfaces of the two adjacent storage cells 1 and the main body portions 503 located therebetween. At least one of a heat management system, a gas exhaust system, an FPC, and wiring connected to the connector 323 may be provided in the region R2.

[0080] For example, in the battery 100, in place of at least one of the holding members 51 to 54, the holding member 50A having the above-described configuration may be employed.

[0081] 1 employs a common spacer 60 for the first and second cell connected bodies. However, this is not limiting, and separate spacers may be provided between adjacent storage cells in each of the first and second cell connected bodies. Furthermore, the spacer 60 may be replaced with a holding member.

[0082] Fig. 11 is a diagram showing a second modified example of the battery shown in Fig. 1. Fig. 12 is a cross-sectional view taken along line XII-XII in Fig. 11.

[0083] 11 and 12, the battery 100B according to the second modification has basically the same configuration as the battery 100 shown in FIG. 1. However, the battery 100B employs three holding members 60B instead of the three spacers 60 (FIG. 1). The cross section taken along line VV in FIG. 11 is the same as the cross section shown in FIG. 5.

[0084] As shown in Fig. 11, the holding member 60B is formed in an H-shape in a plane perpendicular to the Z direction (XY plane). Moreover, as shown in Fig. 12, the holding member 60B has an X-shaped cross section as a cross section perpendicular to the Y direction (XZ cross section). Due to this shape, the holding member 60B can sandwich each of the energy storage cells 12 and 13 that face each other in the X direction. The holding member 60B holds both the upper and lower surfaces of the energy storage cell 12 and also holds both the upper and lower surfaces of the energy storage cell 13.

[0085] Specifically, the holding member 60B has a first holding portion 601, a second holding portion 602, and a main body portion 603. The main body portion 603 is located between the first holding portion 601 and the second holding portion 602 in the Z direction, and functions as a connector that connects these holding portions. The main body portion 603 is also located between the energy storage cell 12 and the energy storage cell 13 in the X direction, and functions as a spacer that keeps the spacing between these energy storage cells constant. Note that a Y-direction groove may be formed in at least one of the -Z side end face of the first holding portion 601 and the +Z side end face of the second holding portion 602.

[0086] The +Z side surface of the first holding portion 601 functions as a holding surface and is in contact with the lower surfaces of the power storage cells 12 and 13. The -Z side surface of the second holding portion 602 functions as a holding surface and is in contact with the upper surfaces of the power storage cells 12 and 13. A portion of each of the first holding portion 601 and the second holding portion 602 on the +X side of the main body portion 603 extends from the main body portion 603 toward the power storage cell 12 and holds (more specifically, sandwiches) the power storage cell 12. Furthermore, a portion of each of the first holding portion 601 and the second holding portion 602 on the -X side of the main body portion 603 extends from the main body portion 603 toward the power storage cell 13 and holds (more specifically, sandwiches) the power storage cell 13.

[0087] The holding member 60B contains an insulating material (e.g., resin) and has insulating properties. The holding member 60B is, for example, an integrally molded product. The first holding portion 601, the second holding portion 602, and the main body portion 603 are seamlessly integrated. However, this structure is not limited thereto, and each portion constituting the holding member 60B may be molded separately and then joined together. Each of the first holding portion 601, the second holding portion 602, and the main body portion 603 is, for example, a resin member. However, this is not limited thereto, and each portion may be formed from a different material.

[0088] While Fig. 12 shows only the holding member 60B located between the energy storage cells 12 and 13 as a representative example, the other holding members 60B shown in Fig. 11 also have the structure shown in Fig. 12. The holding member 60B described above makes it easier to suppress the movement of the cell connected bodies 10 and 20.

[0089] Fig. 13 is a diagram showing a third modified example of the battery shown in Fig. 1. Fig. 14 is a cross-sectional view taken along line XIV-XIV in Fig. 13.

[0090] 13 and 14, a battery 100C according to the third modification has basically the same configuration as the battery 100B shown in FIG. 11. However, the battery 100C employs a holding member 60C instead of the holding member 60B (FIGS. 11 and 12). The cross section taken along line VV in FIG. 13 is the same as the cross section shown in FIG. 5.

[0091] As shown in FIG. 13 , in battery 100C, one holding member 500A is formed by holding members 51 to 54 and a holding member 60C disposed between adjacent holding members so as to connect these holding members 51 to 54. Holding member 500A includes holding members 51 to 54 and holding member 60C formed to physically connect the holding members. Holding members 51 to 54 are connected in a row in the X direction inside case 300. Holding members 60C are provided in three locations. Holding member 60C positioned between holding members 51 and 52 in the X direction functions as a connecting portion connecting holding members 51 and 52. Holding member 60C positioned between holding members 52 and 53 in the X direction functions as a connecting portion connecting holding members 52 and 53. Holding member 60C positioned between holding members 53 and 54 in the X direction functions as a connecting portion connecting holding members 53 and 54.

[0092] As shown in FIG. 14, holding member 60C basically has the same configuration as holding member 60B shown in FIG. 12. Holding member 60C has first holding portion 601A, second holding portion 602A, and main body portion 603A. First holding portion 601A, second holding portion 602A, and main body portion 603A basically have the same configurations as first holding portion 601, second holding portion 602, and main body portion 603 shown in FIG. 12, respectively. However, first holding portion 601A is connected to holding members 52 and 53 adjacent to it on the +X side and the -X side, respectively. Second holding portion 602A is also connected to holding members 52 and 53 adjacent to it on the +X side and the -X side, respectively.

[0093] While Fig. 14 shows only the holding member 60C located between the energy storage cells 12 and 13 as a representative example, the other holding members 60C shown in Fig. 13 also have the structure shown in Fig. 14. The holding member 500A described above makes it easier to suppress the movement of the cell assemblies 10 and 20. The holding member 500A may be an integrally molded product, or may be a composite in which a plurality of separately molded members are joined together.

[0094] Fig. 15 is a diagram showing a fourth modified example of the battery shown in Fig. 1. Fig. 16 is a cross-sectional view taken along line XVI-XVI in Fig. 15. Fig. 17 is a cross-sectional view taken along line XVII-XVII in Fig. 15.

[0095] 15 to 17, the battery 100D according to the fourth modification basically has the same configuration as the battery 100C shown in Fig. 13. However, the battery 100D employs a holding member 500B instead of the holding member 500A (Fig. 13).

[0096] Holding member 500B includes holding members 51D, 52D, 53D, and 54D, and holding member 60D provided between adjacent holding members to connect these holding members 51D to 54D. In holding member 500B, the -Z side ends of each of holding members 51D to 54D are connected in the X direction via holding member 60D. Holding member 60D is provided in three locations.

[0097] As shown in Fig. 16, holding member 53D has a structure obtained by removing second holding portion 532 from holding member 53 shown in Fig. 5. Holding member 53D has first holding portion 531D and main body portion 533D that have structures similar to first holding portion 531 and main body portion 533 shown in Fig. 5. Although Fig. 16 shows only holding member 53D as a representative, each of holding members 51D, 52D, and 54D also has the structure shown in Fig. 16.

[0098] As shown in Fig. 17, holding member 60D has a structure in which second holding portion 602A is removed from holding member 60C shown in Fig. 14. Holding member 60D has first holding portion 601D and main body portion 603D that have structures similar to first holding portion 601A and main body portion 603A shown in Fig. 14. Fig. 17 shows only holding member 60D located between energy storage cells 12 and 13 as a representative, but the other holding members 60D shown in Fig. 15 also have the structure shown in Fig. 17.

[0099] 16 and 17, in battery 100D, a space (region R3) is formed between the inner surface (top surface) of main body 310 of case 300 and the +Z side surfaces of each of the above-described plurality of storage cells and plurality of holding members. At least one of a heat management system, a gas exhaust system, an FPC, and wiring connected to connector 323 may be provided in region R3. The above-described holding member 500B makes it easier to ensure space within case 300. Holding member 500B may be an integrally molded product, or may be a composite in which multiple separately molded members are joined together.

[0100] A flow path through which smoke emitted from the energy storage cells flows may be formed in the spacer 60, the holding member 60B, the holding member 60C, or the holding member 60D described above. FIG. 18 is a diagram showing an example in which a flow path is formed in the spacer 60 shown in FIG. 6. In the example shown in FIG. 18, an FPC (flexible printed circuit board) 700 is provided in the region R1 shown in FIG. 6, and a flow path GL1 is formed in the spacer 60. The spacer 60E shown in FIG. 18 is the spacer 60 in which the flow path GL1 is formed. Like the spacer 60 shown in FIG. 1, the spacer 60E is located between adjacent energy storage cells in the cell connected body 10 (first cell connected body) and between adjacent energy storage cells in the cell connected body 20 (second cell connected body). The FPC 700 is configured to detect smoke. The FPC 700 may be configured to be disconnected, for example, when smoke is exhausted. The spacer 60E is provided with a flow path GL1 that guides smoke emitted from adjacent energy storage cells 12 and 13 to the FPC 700. When the FPC 700 detects smoke exhaust from at least one of the adjacent power storage cells 12 and 13, the FPC 700 may output a signal indicating this to the connector 323.

[0101] 1, the flow path GL1 may be formed in all three spacers 60, or in only one or two spacers 60. The flow path GL1 shown in FIG. 18 may be modified so as to guide smoke from only one of the adjacent energy storage cells 12 and 13 to the FPC 700.

[0102] A flow path through which smoke emitted from the energy storage cells flows may be formed in the holding members 51 to 54, the holding member 50, the holding member 50A, the resin members 51A to 54A, the resin members 51B to 54B, or the holding members 51D to 54D described above. FIG. 19 is a diagram showing an example in which a flow path is formed in the holding member 50A shown in FIG. 10. In the example shown in FIG. 19, an FPC 700 is provided in the region R2 shown in FIG. 10, and a flow path GL2 is formed in the holding member 50A. The holding member 50E shown in FIG. 19 is the holding member 50A in which the flow path GL2 is formed. The holding member 50E is used in place of at least one of the holding members 51 to 54 shown in FIG. 1, and holds the first and second energy storage cells facing each other in the Y direction between the first and second energy storage cells. The FPC 700 is configured to detect smoke. The holding member 50E is provided with a flow path GL2 that guides smoke emitted from each of two storage cells 1 (first storage cell and second storage cell) facing each other in the Y direction to the FPC 700. When the FPC 700 detects smoke emitted from at least one of the two facing storage cells 1, the FPC 700 may output a signal indicating this to the connector 323. Note that the flow path GL2 shown in FIG. 19 may be modified so as to guide smoke from only one of the two facing storage cells 1 in the Y direction to the FPC 700.

[0103] The batteries 100, 100A to 100D and their modifications can function as a power storage device on their own, but a plurality of such batteries may also be combined to form a module.

[0104] Fig. 20 is a diagram showing an example of a power storage module including multiple batteries. Fig. 20 shows the up-down direction, the front-rear direction, and the left-right direction, which are perpendicular to one another. "Down" corresponds to the vertical direction (the direction of gravity), and "up" corresponds to the opposite direction. The diagram showing the power storage module from above shows the internal structure of the power storage module 200.

[0105] The energy storage module 200 shown in FIG. 20 includes a plurality of batteries 100. In the energy storage module 200, the plurality of batteries 100 (see FIG. 1) are arranged so that the +Z side surface of each battery faces upward and the −Z side surface of each battery faces downward. However, for each of the plurality of batteries 100, it is possible to arbitrarily set whether the lid body 320 (the +X side surface) shown in FIGS. 1 and 2 faces left or right. For example, all of the batteries 100 in the energy storage module 200 may face the same direction. Alternatively, the energy storage module 200 may include both batteries 100 with the lid body 320 facing right and batteries 100 with the lid body 320 facing left. The plurality of batteries 100 may be electrically connected in series or in parallel. The energy storage module 200 functions as an energy storage device.

[0106] In the example shown in FIG. 20 , a temperature adjustment device 800 is provided on the upper surface of the power storage module 200. The temperature adjustment device 800 is configured to adjust the temperature of each of the multiple batteries 100 included in the power storage module 200. The temperature adjustment device 800 may include at least one of a heater and a cooler. The temperature adjustment 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 each connector 323 ( FIG. 1 ) of the multiple batteries 100 included in the power storage module 200 via signal lines. The control device 900 receives signals (for example, sensor detection values) from the connector 323 of each battery and sends control commands to the temperature adjustment device 800. The control device 900 may control the temperature adjustment device 800 based on the state of each battery. Note that in the power storage module 200, another battery (one of the batteries 100A to 100D, or a battery with the above-mentioned various modifications) may be used instead of the battery 100. The temperature adjustment device 800 may also be provided on the lower surface of the power storage module 200.

[0107] The above-described batteries 100, 100A to 100D and their variations, and the power storage module 200 can be mounted on, for example, a mobile body. Examples of mobile bodies include automobiles (electric vehicles, hybrid vehicles, etc.), vehicles other than automobiles (ships, airplanes, etc.), mobile machines (agricultural machines, construction machines, etc.), and unmanned mobile bodies (automated guided vehicles, robots, etc.). However, the power storage device may be used for any purpose, and may be for stationary use.

[0108] FIG. 21 is a diagram showing an example of a vehicle equipped with the power storage module shown in FIG. 20. The vehicle 2000 shown in FIG. 21 includes a battery pack 1000. The battery pack 1000 includes a plurality of power storage modules 200 and functions as a power storage device. The battery pack 1000 may further include the temperature adjustment device 800 shown in FIG. 20. The battery pack 1000 may be installed either above or below the floor of the vehicle 2000. The vehicle 2000 is, for example, an electric vehicle configured to be able to run using power output from the battery pack 1000. The battery pack 1000 may supply power to a traction motor mounted on the vehicle 2000. In the battery pack 1000, the power storage modules 200 are electrically connected to each other via, for example, a bus bar. The battery pack 1000 may include 100 or more power storage cells.

[0109] The various features of the power storage device described above (the features described in the embodiments and modifications) may be implemented in any combination. The power storage device may be applied to devices other than vehicles.

[0110] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0111] 1, 11 to 14, 21 to 24: storage cells; 2, 2A to 2C: connection parts; 10, 20: cell coupling bodies; 50, 50A, 50E, 51 to 54, 51D to 54D: holding members; 51A to 54A, 51B to 54B: resin members; 60, 60E: spacers; 60B, 60C, 60D: holding members; 70: metal plates; 100, 100A to 100D: batteries; 200: storage modules; 700: FPCs; 1000: battery packs; 2000: vehicles.

Claims

1. An electricity storage device, The power storage device includes a first cell connected body and a second cell connected body that are electrically connected to each other, the first cell coupled body includes a plurality of first energy storage cells and first connection portions that electrically connect the first energy storage cells to each other, the second cell coupled body includes a plurality of second energy storage cells and second connection portions that electrically connect the second energy storage cells to each other, at least one of the plurality of first storage cells is arranged to face any one of the plurality of second storage cells in a first direction; The power storage device further includes a holding member between the opposing first and second power storage cells, the holding member holding the first and second power storage cells.

2. The holding member is a main body portion located between the first storage cell and the second storage cell; a first cell holding portion that extends from the main body portion toward the first storage cell and holds the first storage cell; a second cell holding portion that extends from the main body portion toward the second storage cell and holds the second storage cell; The power storage device according to claim 1 ,

3. the main body portion is located between the first storage cell and the second storage cell in a second direction perpendicular to the first direction, the first cell holding portion holds the first storage cell in a third direction perpendicular to both the first direction and the second direction; The power storage device according to claim 2 , wherein the second cell holding portion sandwiches the second power storage cell in the third direction.

4. the first cell connected body and the second cell connected body are aligned in a second direction perpendicular to the first direction, The power storage device according to claim 1 , wherein the holding member has an X-shaped cross section perpendicular to the second direction.

5. 2. The energy storage device according to claim 1, wherein the holding member has a first resin member that holds the first energy storage cell, a second resin member that holds the second energy storage cell, and a metal plate positioned between the first resin member and the second resin member.

6. The power storage device further includes a circuit board that detects smoke; The power storage device according to claim 1 , wherein the holding member is provided with a flow path that guides smoke emitted from at least one of the opposing first and second power storage cells to the circuit board.

7. The power storage device is a smoke detecting circuit board; a spacer positioned between adjacent energy storage cells in the first cell string and / or between adjacent energy storage cells in the second cell string; Furthermore, The power storage device according to claim 1 , wherein the spacer is provided with a flow path that guides smoke emitted from at least one of the adjacent power storage cells to the circuit board.

8. each of the plurality of first storage cells is disposed to face one of the plurality of second storage cells in the first direction; The power storage device according to claim 1 , wherein the holding member is provided for each combination of the opposing first and second power storage cells.

9. A vehicle comprising the power storage device according to any one of claims 1 to 8.

Images