Power storage device and vehicle

Abstract

To provide a power storage device having a configuration that facilitates the placement of cell connections into cases, and a vehicle.SOLUTION: A power storage device (battery 100) configured for power storage comprises a case 300, one or more cell connections (cell connections 10, 20), and a base member 50 for supporting one or more cell connections. The cell connection comprises a plurality of power storage cells (power storage cells 11 to 14, 21 to 24) and connection sections (connection sections 2A, 2B) that electrically connect the power storage cells to each other. One or more cell connections and the base member 50 are housed within the case 300.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] The cell assembly is difficult to fit into a case because it includes high-rigidity energy storage cells and low-rigidity connection parts. For example, when fitting the cell assembly into a case, stress is generated in the connection parts, which may cause damage to the connection parts.

[0006] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide an electricity storage device and a vehicle having a configuration that makes it easy to put a cell assembly into a case. [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) An electricity storage device configured to be able to store electricity includes a case, one or more connected cell bodies, and a base member on which the one or more connected cell bodies are placed. The connected cell body includes a plurality of electricity storage cells and connection parts that electrically connect the electricity storage cells to each other. The one or more connected cell bodies and the base member are housed in a case.

[0009] With the above configuration, one or more cell combinations can be placed on the base member and then placed in the case, which makes it easier to place the cell combinations in the case.

[0010] (Item 2) In the electricity storage device described in item 1, the case has a rectangular parallelepiped shape with the connecting direction of the cell connected body as the longitudinal direction.

[0011] In the above-described energy storage device, the base member carrying one or more connected cell units can be slid toward the rectangular parallelepiped case, thereby allowing the one or more connected cell units to be inserted into the case together with the base member.

[0012] (Item 3) In the energy storage device described in item 2, the case has four faces extending in the connection direction of the one or more cell connected bodies and two faces covering the ends of the one or more cell connected bodies. The four faces include a pair of opposing faces, called first opposing faces, and a second opposing face, called a second opposing face, having an area larger than that of the first opposing faces. The base member is disposed on one of the first opposing faces.

[0013] As described above, by arranging the base member on a surface with a small area, it becomes easier to reduce the dimensions of the base member.

[0014] (Item 4) In the electricity storage device according to any one of items 1 to 3, one or more of the cell connected bodies are bonded to the base member.

[0015] According to the above configuration, when one or more cell connected bodies are placed on the base member and put into the case, it is possible to prevent the one or more cell connected bodies from coming off the base member.

[0016] (Item 5) In the electricity storage device according to any one of items 1 to 3, the one or more cell connected bodies are slidable in the connecting direction relative to the base member.

[0017] According to the above configuration, after one or more cell connected bodies are placed on the base member and inserted into the case, it becomes possible to slide the one or more cell connected bodies in the connecting direction relative to the base member.

[0018] (Item 6) In the electricity storage device according to any one of items 1 to 5, the base member has a flat plate shape.

[0019] The base member is easy to manufacture, and the above configuration reduces manufacturing costs.

[0020] (7) In the electricity storage device according to any one of the first to fifth aspects, the base member has a U-shaped cross section.

[0021] By placing one or more cell connected bodies in the recess (U-shaped portion) of the base member, it becomes easier to properly insert the one or more cell connected bodies, with the cell connected bodies placed on the base member, into the case.

[0022] (Item 8) In the energy storage device according to any one of items 1 to 5, one or more recesses are formed on the surface of the base member on which one or more cell connected bodies are placed, into which a part of one or more cell connected bodies can fit.

[0023] By placing one or more cell connected bodies in the one or more recesses, it becomes easier to properly place the one or more cell connected bodies on the base member into the case.

[0024] (Item 9) In the energy storage device according to any one of Items 1 to 5, the one or more cell connected bodies include a first cell connected body and a second cell connected body that are electrically connected. A first recess into which a portion of the first cell connected body fits and a second recess into which a portion of the second cell connected body fits are formed on a surface of the base member on which the one or more cell connected bodies are placed.

[0025] By placing the first cell connected body and the second cell connected body in the first recess and the second recess, respectively, it becomes easier to properly place the first cell connected body and the second cell connected body in the case while they are placed on the base member.

[0026] (Item 10) In the energy storage device according to any one of items 1 to 9, a linear convex portion extending in the connecting direction of the one or more cell connected bodies is formed on the surface of the base member opposite to the surface on which the one or more cell connected bodies are placed.

[0027] The linear protrusions allow the base member to move straight along the inner surface of the case, making it easier to properly insert one or more cell combinations into the case while they are placed on the base member.

[0028] (Item 11) In the electricity storage device according to any one of items 1 to 9, a sheet that reduces the coefficient of friction between the base member and the inner surface of the case is provided on a surface of the base member opposite to a surface on which one or more cell connected bodies are placed.

[0029] The sheet reduces the coefficient of friction between the base member and the inner surface of the case, making it easier for the base member to slide along the inner surface of the case. This makes it easier to properly insert one or more cell assemblies into the case while they are on the base member.

[0030] (Item 12) In the electricity storage device according to any one of items 1 to 11, the base member is formed with a flow path for discharging gas generated from at least one of the plurality of electricity storage cells.

[0031] According to the above configuration, gas generated from the electricity storage cell can be easily and appropriately discharged.

[0032] According to an embodiment of the second aspect of the present disclosure, there is provided a vehicle as follows.

[0033] (13) The vehicle includes the power storage device according to any one of the first to twelfth paragraphs.

[0034] The vehicle includes an electricity storage device having a configuration that makes it easy to insert the cell assembly into a case. [Effects of the Invention]

[0035] According to the present disclosure, it is possible to provide an electricity storage device and a vehicle having a configuration that makes it easy to put a cell assembly into a case. [Brief explanation of the drawings]

[0036] [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] 10A to 10C are diagrams for explaining the functions and effects achieved by the power storage device according to the embodiment of the present disclosure. [Figure 8] FIG. 2 is a diagram showing a first modified example of the power storage device shown in FIG. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8. [Figure 10] 1. FIG. 5 is a diagram showing a second modified example of the power storage device shown in FIG. [Figure 11] 7 is a cross-sectional view corresponding to FIG. 5 of an electricity storage device according to a second modified example. FIG. [Figure 12] 7 is a cross-sectional view corresponding to FIG. 6 of a power storage device according to a second modified example. FIG. [Figure 13] 1. FIG. 6 is a diagram showing a third modified example of the power storage device shown in FIG. [Figure 14] 1. FIG. 6 is a diagram showing a fourth modified example of the power storage device shown in FIG. [Figure 15]1. FIG. 9 is a diagram showing a fifth modified example of the power storage device shown in FIG. [Figure 16] 1. FIG. 9 is a diagram showing a sixth modified example of the power storage device shown in FIG. [Figure 17] 1. FIG. 10 is a diagram showing a seventh modification of the power storage device shown in FIG. [Figure 18] 1. FIG. 10 is a diagram illustrating an eighth modification of the power storage device illustrated in FIG. [Figure 19] FIG. 19 is a cross-sectional view taken along line XIX-XIX in FIG. [Figure 20] FIG. 1 is a diagram illustrating an example of a power storage module including a plurality of batteries. [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

[0037] 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 "-".

[0038] Fig. 1 is a diagram for explaining the configuration of the electricity storage device according to this embodiment. "Case internal configuration diagram-Z" in Fig. 1 is a diagram of the contents of the case as seen from the +Z side. "Case internal configuration diagram-Y" in Fig. 1 is a diagram of the contents of the case as seen from the +Y side.

[0039] 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).

[0040] The battery 100 includes a case 300. The case 300 has a rectangular parallelepiped outer shape. The case 300 has a pair of faces F1 and F2 (first opposing faces) facing each other in the Z direction, a pair of faces F3 and F4 (second opposing faces) facing each other in the Y direction, and faces F5 and F6 (X-direction end faces) located at the ends in the X direction. The area of ​​each of the faces F1 and F2 is smaller than the area of ​​each of the faces F3 and F4. 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, about 100 mm, but the dimensions of the case 300 are not limited to the above.

[0041] 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.

[0042] 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 within 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 within the case 300. The energy storage cells 21 to 24 are connected in a row in the X direction within 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 of the faces F1 to F4 of the case 300 extends in the connecting direction (X direction) of the cell connected bodies 10 and 20. Each of the faces F5 and F6 of the case 300 covers the end portions of the cell connected bodies 10 and 20 in the X direction. Each of the energy storage cells included in the cell connected bodies 10 and 20 is configured to be able to store electricity.

[0043] 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.

[0044] The cell connected bodies 10 and 20 are arranged such that the positions of the storage cells and the positions of 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. The end (storage cell 11) on the +X side of the cell connected body 10 is connected to the lid body 320 via a connection terminal T1. The end (storage cell 21) on the +X side of the cell connected body 20 is connected to the lid body 320 via a connection terminal T2.

[0045] The case 300 further accommodates a base member 50. Fig. 2 is a perspective view showing the cell connected bodies 10, 20 and the base member 50 in a separated state.

[0046] As shown in FIG. 2, the base member 50 is U-shaped. The base member 50 includes a plate-like main body 51 and protruding portions 52 and 53. The main body 51 is elongated in the X direction (the connecting direction of the cell connected bodies 10 and 20). The main body 51 is formed along the cell connected bodies 10 and 20. The protruding portions 52 and 53 are located at the +Y side end and the -Y side end of the main body 51, respectively. Each of the protruding portions 52 and 53 is formed linearly in the X direction and protrudes to the +Z side. The base member 50 is housed in the case 300 with the cell connected bodies 10 and 20 placed on the main body 51. Details of the base member 50 will be described later (see FIGS. 5 and 6).

[0047] 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, and when the pressure inside the case 300 exceeds a predetermined level, gas is discharged to the outside of the case 300 through the sealing hole 321. 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, 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 serving as a negative electrode tab and electrode tab 322A serving as a positive electrode tab. Connector 323 includes, for example, an output terminal that outputs a detection signal indicating a state inside case 300 (e.g., the temperature of each 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 storage cell inside case 300.

[0048] 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."

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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).

[0056] 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.

[0057] 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.

[0058] 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).

[0059] 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).

[0060] 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.

[0061] 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.

[0062] Fig. 5 is a cross-sectional view taken along line VV in Fig. 1. Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 1.

[0063] As shown in FIGS. 5 and 6 , the cell assemblies 10 and 20 are placed on a base member 50 and housed in a case 300. An insulating layer 3 containing a resin such as PET (polyethylene terephthalate) is provided on the inner surface of a main body 310 of the case 300. This electrically insulates the case 300 from the components inside the case 300. However, in batteries that ensure sufficient insulation, the insulating layer 3 can be omitted. A region R1 exists between the +Z side surface of each storage cell included in the cell assemblies 10 and 20 and the inner surface (top surface) of the main body 310. At least one of a thermal management system (e.g., a heater and / or a temperature sensor), a gas exhaust system (e.g., a gas flow path and / or a pressure sensor), an FPC (flexible printed circuit board), and wiring connected to a connector 323 may be provided in the region R1. The devices and / or sensors provided in the region R1 may be connected to the connector 323 of the lid 320.

[0064] As shown in FIG. 5 , the base member 50 has a U-shaped cross section (YZ cross section) perpendicular to the X direction. The base member 50 is basically formed in a plate shape. However, in addition to a plate-shaped main body portion 51, the base member 50 includes protrusions 52 and 53 that protrude from the main body portion 51 toward the +Z side. The protrusions 52 and 53 are located on both sides of the adjacent storage cells 13 and 23 in the Y direction, and act to hold the storage cells 13 and 23 in place. The protrusion 52 suppresses movement of the storage cell 13 toward the +Y side. The protrusion 53 suppresses movement of the storage cell 23 toward the -Y side.

[0065] The base member 50 contains an insulating material (e.g., resin) and has insulating properties. However, the material of the base member 50 is not limited to this and can be changed as appropriate. The base member 50 may contain metal. The main body portion 51 and the protruding portions 52, 53 may be integrally molded, or may be a composite formed by joining multiple separately molded components. The main body portion 51 and the protruding portions 52, 53 may be formed from the same material or from different materials.

[0066] A recess (more specifically, a groove in the X direction) is formed in the base member 50 in a portion between the protrusions 52 and 53 (above the main body 51). The -Z side ends of the storage cells 13 and 23 are inserted into this recess, and the storage cells 13 and 23 are adhered to the +Z side surface of the main body 51 with an adhesive 60. The adhesive 60 may have higher thermal conductivity than the main body 51. The base member 50 has a sheet 70 on the -Z side surface of the main body 51. The coefficient of friction between the sheet 70 and the inner surface of the main body 310 is lower than the coefficient of friction between the main body 51 and the inner surface of the main body 310. Therefore, the sheet 70 acts to reduce the coefficient of friction between the base member 50 and the inner surface of the case 300. Hereinafter, the +Z side surface of the base member 50 (the surface on which the cell connected bodies 10, 20 are placed) may be referred to as the "first surface," and the -Z side surface of the base member 50 (the surface opposite to the surface on which the cell connected bodies 10, 20 are placed) may be referred to as the "second surface."

[0067] FIG. 5 shows only a representative pair of storage cells 13 and 23 adjacent in the Y direction. FIG. 6 shows only a representative pair of storage cells 12 and 13 adjacent in the X direction. However, as shown in FIG. 1 , main body 51 is a plate-like member extending over substantially the entire area of ​​main body 310 in the X direction, and each of protrusions 52 and 53 is a linear protrusion extending over substantially the entire area of ​​main body 310 in the X direction. All of the storage cells included in cell connected bodies 10 and 20 are bonded to main body 51. Protrusion 52 is located on the +Y side of all of the storage cells included in cell connected body 10 and suppresses movement of those storage cells toward the +Y side. Protrusion 53 is located on the −Y side of all of the storage cells included in cell connected body 20 and suppresses movement of those storage cells toward the −Y side.

[0068] FIG. 7 is a diagram illustrating the functions and effects of the battery 100 according to this embodiment. As shown in FIG. 1, the battery 100 includes a case 300, the cell combinations 10 and 20, and a base member 50 on which the cell combinations 10 and 20 are placed. The cell combinations 10 and 20 and the base member 50 are housed in the case 300. The case 300 has a rectangular parallelepiped shape with its longitudinal direction in the X direction (the direction in which the cell combinations 10 and 20 are connected). In the battery 100 having this configuration, the base member 50 functions as a sliding board. As shown in FIG. 7, the base member 50 with the cell combinations 10 and 20 placed thereon is slid toward the rectangular parallelepiped case 300 (more specifically, the cylindrical main body 310 with a bottom), thereby allowing the cell combinations 10 and 20 to be inserted together with the base member 50 into the main body 310 of the case 300. The cell assemblies 10 and 20 are bonded to the first surface of the base member 50, preventing the cell assemblies 10 and 20 from separating from the base member 50 when the cell assemblies 10 and 20 are inserted into the main body 310 while resting on the base member 50. Furthermore, a sheet 70 (FIGS. 5 and 6) is provided on the second surface of the base member 50 to reduce the coefficient of friction between the base member 50 and the inner surface of the main body 310 of the case 300, making it easier for the base member 50 to slide along the inner surface of the main body 310. The protrusions 52 and 53 (FIGS. 5 and 6) not only stabilize the orientation of the cell assemblies 10 and 20 as the base member 50 slides along the inner surface of the main body 310, but also function as guides for insertion. The cell assemblies 10 and 20 are positioned in place by inserting the base member 50 into the main body 310 until the end face on the -X side of the base member 50 abuts the inner surface on the -X side of the main body 310 (the surface opposite the opening). As described above, the above configuration makes it easier to properly insert the cell assemblies 10 and 20 into the case 300. Since the relative positions of the energy storage cells hardly change when the base member 50 is inserted, the connection portions 2A to 2C are less likely to be damaged. After the cell assemblies 10 and 20 are inserted into the main body 310 together with the base member 50, the main body 310 and the lid 320 are joined together as shown in FIG. 1. The main body 310 and the lid 320 are welded together with a laser, for example.

[0069] As shown in FIGS. 1, 5, and 6, the base member 50 is disposed on one surface F1 of the first opposing surfaces (surfaces F1 and F2) that has a smaller area than the second opposing surfaces (surfaces F3 and F4). By disposing the base member 50 on the surface F1 with a smaller area in this manner, it becomes easier to reduce the dimensions of the base member 50. Furthermore, the reduced area of ​​the base member 50 makes the base member 50 more likely to slide. However, this is not limiting, and the base member 50 may be disposed on the second opposing surface instead of the first opposing surface.

[0070] Fig. 8 is a diagram showing a first modified example of the battery shown in Fig. 1. Fig. 9 is a cross-sectional view taken along line IX-IX in Fig. 8.

[0071] As shown in FIG. 8, the battery 100A according to the first modification has a configuration similar to that of the battery 100 shown in FIG. 1. However, the battery 100A includes a base member 50A instead of the base member 50 (FIG. 1). As shown in FIGS. 8 and 9, the base member 50A includes, in addition to the main body portion 51 and the protruding portions 52 and 53, protruding portions 54 to 56 protruding from the main body portion 51 toward the -Z side. The protruding portions 54 and 55 are located at the +Y side end and the -Y side end of the main body portion 51, respectively. The protruding portions 54 and 55 are located opposite the protruding portions 52 and 53, respectively. The protruding portion 56 is located between the protruding portions 54 and 55. Each of the protruding portions 54 to 56 is a linear protruding portion extending substantially the entire area of ​​the main body 310 in the X direction. The main body portion 51 and the protruding portions 52 to 56 may be integrally molded or may be a composite formed by joining multiple separately molded components.

[0072] In the battery 100A according to the first modification, linear protrusions 54-56 extending in the X direction (the direction in which the cell assembly 10, 20 are connected) are formed on the second surface of the base member 50A. The protrusions 54-56 slide along the inner surface of the main body 310 of the case 300, and the base member 50A is guided by the protrusions 54-56, making it easier to move in the X direction within the main body 310. This allows the base member 50A to move straight along the inner surface of the main body 310 via the linear protrusions 54-56. This makes it easier to properly insert the cell assembly 10, 20 placed on the base member 50A into the main body 310.

[0073] Fig. 10 is a diagram showing a second modified example of the battery shown in Fig. 1. Fig. 11 is a cross-sectional view of a power storage device according to the second modified example, corresponding to Fig. 5. Fig. 12 is a cross-sectional view of a power storage device according to the second modified example, corresponding to Fig. 6.

[0074] As shown in Fig. 10, battery 100B according to the second modification basically has the same configuration as battery 100 shown in Fig. 1. However, battery 100B includes case 300A instead of case 300 (Fig. 1) and base member 50B instead of base member 50 (Fig. 1). Case 300A includes main body 310A and lids 320A and 330A.

[0075] The main body 310A is a cylindrical housing having openings on both end faces in the X direction (the end face on the +X side and the end face on the −X side), and houses the cell connected bodies 10 and 20. The lid 320A has sealing holes 321A facing each other in the X direction in the base member 50B, closing the opening on the +X side of the main body 310A. The lid 330A has sealing holes 331A facing each other in the X direction in the base member 50B, closing the opening on the −X side of the main body 310A. Each of the sealing holes 321A, 331A has a sealing structure, for example, using a metal cap (outside the case) and a sealing member (inside the case). This sealing structure ensures airtightness within the case 300A, and when the pressure within the case 300A exceeds a predetermined level, gas is discharged to the outside of the case 300A through the sealing holes 321A, 331A.

[0076] As shown in FIGS. 10 to 12, the base member 50B is the base member 50 (see FIG. 1) in which a flow path GL1 is formed. The flow path GL1 is a flow path for discharging gas generated from the energy storage cells. As shown in FIG. 12, in the base member 50B, a through-hole (for example, a hole penetrating in the Z direction) is formed in a region P1 between two energy storage cells adjacent to each other in the X direction, which connects the flow path GL1 to the space between the energy storage cells. The through-hole and the flow path GL1 guide gas generated from each energy storage cell included in the cell connected bodies 10 and 20 housed in the case 300A to the sealing hole 321A or 331A. Each of the sealing holes 321A and 331A is configured to be able to discharge gas inside the case 300A to the outside of the case 300A. This configuration makes it easier to appropriately discharge gas generated from the energy storage cells.

[0077] The flow path GL1 forms a cavity inside the base member 50B. In this way, the base member 50B has a hollow structure. This makes it easier for the base member 50B to absorb shocks applied to the case 300A from the outside. The flow path GL1 may be formed by mechanical processing or chemically by etching or the like.

[0078] FIG. 13 is a diagram showing a third modified example of the battery shown in FIG. 1. As shown in FIG. 13, the battery 100C according to the third modified example basically has the same configuration as the battery 100 shown in FIG. 1. However, the battery 100C includes a base member 50C instead of the base member 50 (FIG. 1). The base member 50C is the base member 50 (see FIG. 1) in which a cavity R2 that does not function as a gas discharge flow path is formed. Multiple cavities R2 are formed inside the base member 50C. The base member 50C has a hollow structure. This makes it easier for the base member 50C to absorb impacts applied to the case 300 from the outside. The multiple cavities R2 may be cavities made of a porous body. The cavity R2 may be used as a path for a heat medium (e.g., a refrigerant).

[0079] FIG. 14 is a diagram showing a fourth modified example of the battery shown in FIG. 1. As shown in FIG. 14, a battery 100D according to the fourth modified example basically has the same configuration as the battery 100 shown in FIG. 1. However, the battery 100D includes a base member 50D instead of the base member 50 (FIG. 1). The base member 50D has a flat plate shape. The base member 50D does not have any protrusions. The base member 50D is easy to manufacture. This configuration allows for reduced manufacturing costs.

[0080] FIG. 15 is a diagram illustrating a fifth modified example of the battery illustrated in FIG. 1. As illustrated in FIG. 15, a battery 100E according to the fifth modified example has basically the same configuration as the battery 100 illustrated in FIG. 1. However, the battery 100E includes a base member 50E instead of the base member 50 (FIG. 1). As illustrated in FIG. 15, the base member 50E further includes a plurality of protrusions 57 protruding from the main body 51 toward the +Z side, in addition to the main body 51 and the protrusions 52 and 53 illustrated in FIG. 5. The protrusions 57 are provided in positions corresponding to the respective connection portions 2A in the cell connected body 10. Although FIG. 15 illustrates only the energy storage cells 12 and 13 included in the cell connected body 10, the protrusions 57 are also provided in positions corresponding to the respective connection portions 2B in the cell connected body 20. Each of the plurality of protrusions 57 is located between two energy storage cells adjacent to each other in the X direction. The protrusions 57 are provided at each gap (connection portions 2A and 2B) between the energy storage cells. The formation of multiple protrusions 57 on the main body 51 makes it difficult for the cell combinations 10 and 20 placed on the first surface of the base member 50E to move. For this reason, the adhesive 60 (FIG. 5) may be omitted from the base member 50E. In the example shown in FIG. 15, the sheet 70 (FIG. 5) is omitted, but the sheet 70 may be provided on the second surface of the base member 50E.

[0081] The plurality of protrusions 57 are added to, for example, the base member 50 shown in Fig. 1. However, without being limited to this, the plurality of protrusions 57 may be added to the base member 50A (Fig. 8), the base member 50B (Fig. 10), the base member 50C (Fig. 13), or the base member 50D (Fig. 14).

[0082] FIG. 16 is a diagram showing a sixth modified example of the battery shown in FIG. 1. As shown in FIG. 16, a battery 100F according to the sixth modified example basically has the same cross-sectional structure as the battery 100 shown in FIG. 5. However, in the battery 100F, a gap is formed between a storage cell (e.g., storage cell 13) of a cell connected body 10 and a storage cell (e.g., storage cell 23) of a cell connected body 20 adjacent to each other in the Y direction, and a base member 50F has a protrusion 58 formed to fit into the gap. The protrusion 58 is a linear protrusion extending in the X direction (the connecting direction of the cell connected bodies 10 and 20) and protruding toward the +Z side. The protrusion 58 has a dimension (dimension in the Y direction) corresponding to the spacing between the storage cells and functions as a spacer. For example, as shown in FIG. 16, the protrusion 58 restricts movement of the storage cell 13 toward the −Y side and movement of the storage cell 23 toward the +Y side, thereby preventing the storage cells 13 and 23 from getting too close to each other.

[0083] On the first surface of the base member 50F, a first recess is formed between the protrusion 52 and the protrusion 58, into which the -Z side end of each storage cell (including the storage cell 13) included in the cell connected body 10 (first cell connected body) is fitted. On the first surface of the base member 50F, a second recess is formed between the protrusion 53 and the protrusion 58, into which the -Z side end of each storage cell (including the storage cell 23) included in the cell connected body 20 (second cell connected body) is fitted. By fitting the cell connected bodies 10 and 20 into the first recess and the second recess, respectively, it becomes easier to properly fit the cell connected bodies 10 and 20 into the main body 310 of the case 300 while they are placed on the base member 50F.

[0084] Furthermore, the adhesive 60 (FIG. 5) is omitted from the base member 50F. Therefore, the cell assemblies 10 and 20 placed on the first surface of the base member 50F can slide in the connecting direction (X direction) relative to the base member 50F. With this configuration, after the cell assemblies 10 and 20 are placed on the base member 50F and inserted into the main body 310, the cell assemblies 10 and 20 can be slid in the connecting direction relative to the base member 50F. In the example shown in FIG. 16, the sheet 70 (FIG. 5) is also omitted, but the sheet 70 may be provided on the second surface of the base member 50F.

[0085] The number of cell combinations housed in the case is not limited to two and is arbitrary. The number of cell combinations housed in the case may be three or more, or may be one.

[0086] FIG. 17 is a diagram showing a seventh modified example of the battery shown in FIG. 1. As shown in FIG. 17, a battery 100G according to the seventh modified example basically has the same cross-sectional structure as the battery 100 shown in FIG. 5. However, in the battery 100G, three rows of connected cells are housed in a case 300. A base member 50G has a main body portion 51 formed in a plate shape on the XY plane, protrusions 52 and 53 located on both sides of the three rows of connected cells in the Y direction, a protrusion 58A formed to fit into the gap between the storage cell 1A of the first connected cell portion and the storage cell 1B of the second connected cell portion, and a protrusion 58B formed to fit into the gap between the storage cell 1B of the second connected cell portion and the storage cell 1C of the third connected cell portion. Each of the protrusions 52, 53, 58A, and 58B protrudes from the main body portion 51 toward the +Z side.

[0087] On the first surface of the base member 50G, a first recess is formed between the protrusion 52 and the protrusion 58A, into which the -Z side end portions of the respective storage cells (including the storage cell 1A) included in the first connected cell body are fitted. On the first surface of the base member 50G, a second recess is formed between the protrusion 58A and the protrusion 58B, into which the -Z side end portions of the respective storage cells (including the storage cell 1B) included in the second connected cell body are fitted. On the first surface of the base member 50G, a third recess is formed between the protrusion 58B and the protrusion 53, into which the -Z side end portions of the respective storage cells (including the storage cell 1C) included in the third connected cell body are fitted. By fitting the first connected cell body, the second connected cell body, and the third connected cell body into the first recess, the second recess, and the third recess, respectively, the first to third connected cell bodies can be easily fitted appropriately into the main body 310 of the case 300 while placed on the base member 50G. In the example shown in FIG. 17, the adhesive 60 and the sheet 70 shown in FIG. 5 are omitted, but at least one of the adhesive 60 and the sheet 70 may be provided on the base member 50G.

[0088] Fig. 18 is a diagram showing an eighth modified example of the battery shown in Fig. 1. Fig. 19 is a cross-sectional view taken along line XIX-XIX in Fig. 18.

[0089] As shown in FIG. 18 , a battery 100H according to the eighth modification includes a case 300B and a cell assembly 10 housed in the case 300B. The case 300B houses the cell assembly 10 but does not house the cell assembly 20. The case 300B includes a main body 310B and lids 320B and 330B. The main body 310B is a cylindrical housing having openings on both end faces in the X direction (the end face on the +X side and the end face on the −X side) and houses one cell assembly (the cell assembly 10). The lid 320B closes the opening on the +X side of the main body 310B. The lid 330B closes the opening on the −X side of the main body 310B. The lids 320B and 330B are provided with electrode tabs T3B and T4B, respectively. A connection terminal T1B is provided on the energy storage cell 11 located at one end (+X side) of the cell connected body 10 in the X direction, and a connection terminal T2B is provided on the energy storage cell 14 located at the other end (-X side) of the cell connected body 10 in the X direction. The electrode tabs T3B and T4B are electrically connected to the connection terminals T1B and T2B, respectively. The electrode tabs T3B and T4B function as, for example, a negative electrode tab and a positive electrode tab, respectively. However, without being limited to this, the polarities may be reversed, with the electrode tab T4B being the negative electrode tab and the electrode tab T3B being the positive electrode tab.

[0090] 19, base member 50H further includes plate-shaped main body 51H, protrusions 52H and 53H protruding from main body 51H toward the +Z side, and protrusions 54H and 55H protruding from main body 51H toward the -Z side. Protrusions 52H and 53H are located at the +Y side and the -Y side ends, respectively, on the first surface of base member 50H. Protrusions 54H and 55H are located at the +Y side and the -Y side ends, respectively, on the second surface of base member 50H. Each of protrusions 52H to 55H is a linear protrusion extending substantially the entire area of ​​main body 310B in the X direction.

[0091] On the first surface of the base member 50H, recesses (more specifically, grooves in the X direction) are formed between the protrusions 52H and 53H, into which the -Z side ends of each storage cell (including the storage cell 13) included in the cell assembly 10 fit. The cell assembly 10 placed on the first surface of the base member 50H is slidable in the connection direction relative to the base member 50H. Each storage cell (including the storage cell 13) included in the cell assembly 10 can move along the grooves in the X direction. However, this is not limited to this, and the cell assembly 10 may be bonded to the base member 50H. Furthermore, linear protrusions 54H and 55H that protrude toward the -Z side are formed on the second surface of the base member 50H. The base member 50H can easily move straight in the X direction on the inner surface of the main body 310 via the protrusions 54H and 55H. The main body 51H and the protrusions 52H to 55H may be integrally molded or may be a composite formed by joining multiple separately molded components. A convex portion that protrudes toward the −Z side may be further formed between the convex portion 54H and the convex portion 55H on the second surface of the base member 50H.

[0092] The above-described batteries 100, 100A to 100H and their variations can function as a power storage device on their own, but a plurality of such batteries may also be combined to form a module.

[0093] 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.

[0094] 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.

[0095] 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 100H, or batteries with the various modifications described above) 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.

[0096] The above-described batteries 100, 100A to 100H and their variations, as well as the power storage module 200, may be mounted on, for example, a mobile object. Examples of mobile objects include automobiles (electric vehicles, hybrid vehicles, etc.), vehicles other than automobiles (ships, airplanes, etc.), mobile machines (agricultural machines, construction machines, etc.), and unmanned mobile objects (automated guided vehicles, robots, etc.). However, the power storage device may be used for any purpose, and may be for stationary purposes.

[0097] 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.

[0098] 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.

[0099] 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]

[0100] 1, 11-14, 21-24 storage cells, 2, 2A-2C connection parts, 10, 20 cell connectors, 50, 50A-50H base members, 60 adhesive, 70 sheet, 100, 100A-100H batteries, 200 storage modules, 1000 battery packs, 2000 vehicles.

Claims

1. A power storage device configured to be able to store power, The power storage device includes a case, one or more cell connected bodies, and a base member on which the one or more cell connected bodies are placed, the cell assembly includes a plurality of energy storage cells and connection portions that electrically connect the energy storage cells to each other, The one or more cell connected bodies and the base member are housed in the case.

2. The power storage device according to claim 1 , wherein the case has a rectangular parallelepiped shape with a longitudinal direction that corresponds to a connecting direction of the cell connected body.

3. the case has four surfaces extending in a connection direction of the one or more cell connected bodies and two surfaces covering end portions of the one or more cell connected bodies, the four surfaces include a first opposing surface that is a pair of opposing surfaces, and a second opposing surface that is an opposing surface having an area larger than that of the first opposing surfaces, The power storage device according to claim 2 , wherein the base member is disposed on one of the first opposing surfaces.

4. The power storage device according to claim 1 , wherein the one or more cell connected bodies are bonded to the base member.

5. The power storage device according to claim 1 , wherein the one or more cell connected bodies are slidable in a connecting direction relative to the base member.

6. The power storage device according to claim 1 , wherein the base member has a flat plate shape.

7. The power storage device according to claim 1 , wherein the base member has a U-shaped cross section.

8. The power storage device according to claim 1 , wherein one or more recesses into which parts of the one or more cell connected bodies are fitted are formed in a surface of the base member on which the one or more cell connected bodies are placed.

9. the one or more cell strings include a first cell string and a second cell string that are electrically connected; 2. The energy storage device according to claim 1, wherein a surface of the base member on which the one or more cell connected bodies are placed is formed with a first recess into which a portion of the first cell connected body fits, and a second recess into which a portion of the second cell connected body fits.

10. 2. The energy storage device according to claim 1, wherein a linear convex portion extending in a connecting direction of the one or more cell connected bodies is formed on a surface of the base member opposite to a surface on which the one or more cell connected bodies are placed.

11. The power storage device according to claim 1 , wherein a sheet that reduces a coefficient of friction between the base member and an inner surface of the case is provided on a surface of the base member opposite to a surface on which the one or more cell connected bodies are placed.

12. The power storage device according to claim 1 , wherein the base member is formed with a flow path for discharging gas generated from at least one of the plurality of power storage cells.

13. A vehicle comprising the power storage device according to any one of claims 1 to 12.

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