Power storage device

Abstract

To provide a power storge device which can secure sealability of a storage portion of a power storage element unit with a simple structure.SOLUTION: A power storage device 10 includes: a power storage element unit 200 including a power storage element; a case which stores the power storage element unit; a connector 500 which electrically connects the power storage element unit with external wiring; a partition wall which partitions an internal space of the case into a first space S1 and a second space S2 arranged in a predetermined direction; and a gasket 900 disposed between a surface oriented to the first space of the partition wall and the case. The power storage element unit is disposed in the first space. At least a part of the connector is disposed in the second space.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a power storage device.

Background Art

[0002] Patent Document 1 discloses a power storage device (battery pack) in which a plurality of secondary battery modules are arranged in a housing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the power storage device disclosed in Patent Document 1, a sealing member is arranged between a housing that houses battery modules and a lid that closes an opening of the housing. In such a configuration, when arranging a connector for connecting wiring outside the power storage device (for example, wiring of an external charger) to the power storage device in the housing, it is conceivable to arrange the connector through the housing. In this case, in order to ensure the sealing property (such as waterproof property) of the plurality of battery module accommodation portions, it is necessary to arrange a sealing member around the connector, etc., and there is a risk that the configuration becomes complicated.

[0005] The present invention has been made by the inventors of the present application newly focusing on the above problems, and an object of the present invention is to provide a power storage device that can ensure the sealing property of the accommodation portion of a power storage element unit with a simple configuration in a power storage device including a connector and a power storage element unit including a power storage element.

Means for Solving the Problems

[0006] A power storage device according to one aspect of the present invention includes a power storage element unit including a power storage element, a case that houses the power storage element unit, a connector that electrically connects the power storage element unit and an external wiring, a partition wall that partitions a space inside the case into a first space and a second space arranged in a predetermined direction, and a gasket disposed between a surface of the partition wall facing the first space and the case. The power storage element unit is disposed in the first space, and at least a part of the connector is disposed in the second space.

Advantages of the Invention

[0007] According to the power storage device of the present invention, in a power storage device including a connector and a power storage element unit including a power storage element, the sealing performance of the housing portion of the power storage element unit can be ensured with a simple configuration.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0009] (1) A power storage device according to one aspect of the present invention includes a power storage element unit including a power storage element, a case that houses the power storage element unit, a connector that electrically connects the power storage element unit and an external wiring, a partition wall that partitions the space inside the case into a first space and a second space arranged in a predetermined direction, and a gasket disposed between the surface of the partition wall facing the first space and the case. The power storage element unit is disposed in the first space, and at least a part of the connector is disposed in the second space.

[0010] According to this, in the power storage device, a gasket is disposed between the surface of the partition wall facing the first space and the case, which partitions the space inside the case into the first space and the second space. The power storage element unit including the power storage element is disposed in the first space, and at least a part of the connector is disposed in the second space. In this way, by disposing the gasket between the surface of the partition wall facing the first space and the case, the sealing performance (such as waterproof performance) between the first space and the second space can be improved. Thereby, the sealing performance between the power storage element unit including the power storage element and the connector can be improved with a simple configuration. Therefore, in a power storage device including a connector and a power storage element unit including a power storage element, the sealing performance of the housing portion of the power storage element unit can be ensured with a simple configuration.

[0011] A power storage device including a power storage element, comprising: a power storage element unit including the power storage element; a case housing the power storage element unit; a connector to which wiring outside the power storage device is electrically connected; a main circuit wiring member electrically connecting the power storage element unit and the connector; a partition wall partitioning an inner space of the case into a first space and a second space arranged in a predetermined direction; and a gasket disposed between a surface of the partition wall facing the first space and the case, wherein a portion of the case forming the first space is sealed with respect to the second space, a portion of the partition wall forming the first space is sealed with respect to the second space, the power storage element unit is disposed in the first space, at least a part of the connector is disposed in the second space, and a portion of the main circuit wiring member connected to the power storage element unit is sealed with respect to the second space. The same effects as those of the power storage device described in (1) above can be achieved.

[0012] (2) In the power storage device described in (1) above, an electrical component electrically connected to the power storage element unit and a cover covering the electrical component may be disposed in the second space.

[0013] According to this, even when an electrical component is disposed in the second space, the sealing property (such as waterproof property) of the electrical component can be improved by covering the electrical component with a cover.

[0014] An electrical component electrically connected to the power storage element unit and a cover covering the electrical component are provided. The cover is disposed on a side of the partition wall opposite to the first space, and a third space is formed by the partition wall and the cover. A portion of the cover forming the third space is sealed with respect to a space in which at least a part of the connector is disposed, and the electrical component is disposed in the third space. The same effects as those of the power storage device described in (2) above can be achieved.

[0015] (3) The power storage device according to (2) above may further include a conductive member that penetrates the partition wall within the range where the cover covers the electrical component, and the conductive member electrically connects the power storage element unit and the electrical component.

[0016] According to this, when connecting the power storage element unit and the electrical component with a conductive member, the conductive member is disposed to penetrate the partition wall within the range where the cover covers the electrical component. Thereby, it is possible to suppress a decrease in the sealing property (such as waterproof property) between the first space and the second space due to the conductive member penetrating the partition wall.

[0017] The main circuit wiring member may include a conductive member that electrically connects the power storage element unit and the electrical component, and the conductive member penetrates the partition wall within the range where the cover covers the electrical component. The same effect as the power storage device described in (3) above is achieved.

[0018] (4) In the power storage device according to any one of (1) to (3) above, the case may include a weight, and the gasket may be disposed between the surface of the partition wall facing the first space and the weight.

[0019] According to this, when the case includes a weight, by disposing the gasket between the partition wall and the weight, the sealing property (such as waterproof property) between the first space and the second space can be improved by utilizing the weight.

[0020] (5) The power storage device according to any one of (1) to (4) above may include an inner case that is disposed within the case and houses the power storage element unit, and the partition wall may be a part of the inner case.

[0021] According to this, by making the partition wall a part of the inner case, the sealing property (such as waterproof property) between the first space and the second space can be improved by utilizing a part of the inner case. By housing the power storage element unit in the inner case, the sealing property between the power storage element unit and the connector can be improved.

[0022] (6) In the power storage device according to any one of (1) to (5) above, an opening may be formed in the case, and at least a part of the gasket may be disposed in the opening when viewed from the opening direction of the opening.

[0023] According to this, since at least a part of the gasket is disposed in the opening when viewed from the opening direction of the opening of the case, an opening is provided near the boundary between the case and the partition wall. Therefore, when water enters the second space or the like, the water flowing from the second space toward the first space can be discharged (drained) from the opening. Thereby, the entry of water into the first space can be suppressed.

[0024] Hereinafter, with reference to the drawings, a power storage device according to an embodiment (including its modified examples) of the present invention will be described. Each of the embodiments described below shows comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, manufacturing processes, order of manufacturing processes, etc. shown in the following embodiments are examples and are not intended to limit the present invention. In each figure, the dimensions and the like are not strictly illustrated. In each figure, the same or similar components are denoted by the same reference numerals.

[0025] In the following description and drawings, the direction in which the cover of the power storage device faces the connector, the opening direction of the connector opening of the outer case, the opposing direction of the short side walls of the outer case of the power storage device, or the arrangement direction of the power storage element unit groups is defined as the X-axis direction. The opposing direction of the long side walls of the outer case of the power storage device, the protruding direction of the external terminals of the power storage element unit, or the depth direction of the power storage element unit is defined as the Y-axis direction. The opening direction of the opening of the outer case of the power storage device, the arrangement direction of the connector and the partition wall, the arrangement direction of the power storage element unit (power storage unit), the electrical components and the connector, the arrangement direction of the pair of external terminals provided in the power storage element unit, or the vertical direction is defined as the Z-axis direction. These X-axis direction, Y-axis direction and Z-axis direction are directions that intersect (orthogonal in this embodiment) with each other.

[0026] In the following description, the positive X-axis direction indicates the direction of the arrow on the X-axis, and the negative X-axis direction indicates the direction opposite to the positive X-axis direction. When simply referring to the X-axis direction, it indicates both directions of the positive X-axis direction and the negative X-axis direction or either one of them. The same applies to the Y-axis direction and the Z-axis direction. Hereinafter, the Z-axis direction may also be referred to as the first direction, the X-axis direction may also be referred to as the second direction, and the Y-axis direction may also be referred to as the third direction. Expressions indicating relative directions or postures such as parallel and orthogonal strictly include cases where they are not exactly in that direction or posture. For example, when two directions are parallel, it means not only that the two directions are completely parallel but also that they are substantially parallel, that is, including a difference of, for example, about several percent. In the following description, when expressing "insulation", it means "electrical insulation". A material having insulating properties is preferably formed from a material having a volume resistivity of 1 × 10 10 Ωm or more.

[0027] (Embodiment) [1 General description of the power storage device 10] First, a general description of the power storage device 10 in the present embodiment will be given. FIG. 1 is a perspective view showing the appearance of the power storage device 10 according to the present embodiment. FIG. 2 is a perspective view showing a state in which the lid member 140 and the first fixing member 700 are removed from the power storage device 10 according to the present embodiment. FIG. 3 is a perspective view showing the internal configuration of the outer case 100 of the power storage device 10 according to the present embodiment. In FIG. 3, a state in which the power storage unit 20, the elastic member 800, and the gasket 900 are taken out from the inside of the outer case 100 is shown. In FIG. 3, the lid member 140 and the first fixing member 700 shown in FIG. 2 are not shown. FIG. 4 is an exploded perspective view and a cross-sectional view showing the configuration of the outer case 100 included in the power storage device 10 according to the present embodiment. FIG. 4(a) is an exploded perspective view showing each component when the outer case 100 is disassembled. FIG. 4(b) is a cross-sectional view showing the configuration when the end portion in the negative Z-axis direction (the portion including the intermediate member 130) of the outer case 100 is cut by a plane parallel to the YZ plane. In FIG. 4, the lid member 140 included in the outer case 100 shown in FIG. 2 is not shown. FIG. 5 is an exploded perspective view showing the configuration of the power storage unit 20 included in the power storage device 10 according to the present embodiment. For convenience of explanation, in FIG. 1, a state in which the case lid 150 is removed from the case body 110 of the outer case 100 is shown, and in FIGS. 2 and later, the case lid 150 is not shown.

[0028] The power storage device 10 is a device that can charge electricity from the outside and discharge electricity to the outside. In this embodiment, it has a substantially rectangular parallelepiped shape. A rectangular parallelepiped is a hexahedron composed of all rectangular or square faces. The power storage device 10 is used for power storage applications or power supply applications, etc. The power storage device 10 is used as a battery for driving a moving body such as a forklift, construction machinery, agricultural machinery, an automatic guided vehicle (AGV), an automobile, a motorcycle, a watercraft, a ship, a snowmobile, or a railway vehicle for electric railways, or for engine starting, etc. Examples of the above-mentioned automobiles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and fossil fuel (gasoline, light oil, liquefied natural gas, etc.) automobiles. Examples of the above-mentioned railway vehicles for electric railways include trains, monorails, linear motor cars, and hybrid trains equipped with both a diesel engine and an electric motor. The power storage device 10 can also be used as a stationary battery for household or business use, etc.

[0029] As shown in FIGS. 1 to 3, etc., the power storage device 10 includes an outer case 100, a power storage unit 20, a first fixing member 700, an elastic member 800, and a gasket 900. As shown in FIGS. 1 to 4, the outer case 100 includes a case body 110, a weight 120, an intermediate member 130, a lid member 140, and a case lid 150. As shown in FIGS. 3 and 5, etc., the power storage unit 20 includes a power storage unit body 30 composed of a plurality of power storage element units 200, etc., an inner case 300, an elastic member 400, a connector 500, electrical components 510, a cover 600, a control wiring member 514, and main circuit wiring members such as a first wiring member 515 and a second wiring member 516 (see FIGS. 7 and 8).

[0030] [1.1 Explanation of the outer case 100] The outer case 100 is a rectangular parallelepiped-shaped (box-shaped) container (outer box) that constitutes the outer case (outer packaging body, housing, outer shell) of the power storage device 10. The outer case 100 is disposed outside the power storage unit 20, the first fixing member 700, the elastic member 800, the gasket 900, etc., houses the power storage unit 20, etc., fixes the power storage unit 20, etc. at a predetermined position, and protects them from impacts and the like. Hereinafter, the case body 110, the weight 120, the intermediate member 130, the lid member 140, and the case lid body 150 included in the outer case 100 will be described in detail.

[0031] The case body 110 is a box-shaped member that constitutes the main body of the outer case 100. The case body 110 is a bottomed rectangular cylindrical container in which a rectangular opening 100a is formed in the positive Z-axis direction. The case lid body 150 is a flat plate-shaped member that constitutes the lid of the outer case 100. The case lid body 150 is connected (joined) to the case body 110 and closes the opening 100a of the case body 110. The case lid body 150 is not limited to a flat plate shape as long as it can close the opening 100a, and may be a bottomed rectangular cylindrical shape or any other shape. The case body 110 and the case lid body 150 are metal cases formed of metal members such as steel plates, plated steel plates, iron, aluminum, aluminum alloys, and stainless steel. The case body 110 or the case lid body 150 may be formed of an insulating member such as any resin material that can be used for the terminal cover 260 of the power storage element unit 200 described later.

[0032] The case body 110 includes outer case side walls 111, which are a pair of flat plate-shaped and rectangular long side walls, on both sides in the Y-axis direction, and outer case side walls 112, which are a pair of flat plate-shaped and rectangular short side walls, on both sides in the X-axis direction. The case body 110 includes an outer case bottom wall 113, which is a flat plate-shaped and rectangular bottom wall, in the negative Z-axis direction. As a result, an opening 100a is formed on the side of the case body 110 opposite to the outer case bottom wall 113. That is, the outer case 100 has an opening 100a on the side opposite to the outer case bottom wall 113.

[0033] The outer case side wall 111 is a wall facing (orthogonal to) the Y-axis direction and is disposed at the end of the case body 110 in the Y-axis direction. The outer case side wall 112 is a wall facing (orthogonal to) the X-axis direction and is disposed at the end of the case body 110 in the X-axis direction. The outer case bottom wall 113 is a wall facing (orthogonal to) the Z-axis direction and is disposed at the end of the case body 110 in the minus Z-axis direction. Depending on the configuration (number, size, shape, etc.) of the contents of the outer case 100, the case body 110 (the outer case side walls 111, 112, and the outer case bottom wall 113) may have any shape. In this case, the outer case side wall 111 may be a short side wall and the outer case side wall 112 may be a long side wall.

[0034] At least one of the outer case side walls 111, 112, and the outer case bottom wall 113 is formed with a through portion, which is an opening (through hole, through aperture) penetrating the wall. In the present embodiment, a through portion 111a penetrating the outer case side wall 111 in the Y-axis direction is formed in the outer case side wall 111. Further, at least one of the outer case side walls 111, 112, and the outer case bottom wall 113 is formed with a plurality of through portions 111a. In the present embodiment, through portions 111a are formed in each of the pair of outer case side walls 111. That is, two through portions 111a are formed in the two opposing outer case side walls 111 provided in the outer case 100. The through portion 111a is a rectangular opening formed at the end of the outer case side wall 111 in the minus Z-axis direction and extending in the X-axis direction when viewed from the Y-axis direction.

[0035] A connector opening 112a is formed in the outer case side wall 112 in the plus X-axis direction. The connector opening 112a is a rectangular through hole disposed at the end of the outer case side wall 112 in the plus X-axis direction in the plus Z-axis direction, and the connector 500 passes through it.

[0036] The outer case 100 is further formed with openings 111b and 112b. That is, an opening 111b is formed in each of the pair of outer case side walls 111, and an opening 112b is formed in each of the pair of outer case side walls 112. The openings 111b and 112b are circular through-holes provided at the Z-axis plus direction ends of the outer case side walls 111 and 112. Through the openings 111b and 112b, liquids such as water or condensed water that enter the outer case 100 are discharged to the outside of the outer case 100.

[0037] The weight 120 is a weight disposed inside the case body 110. The weight 120 is a weight (counterweight) for adjusting the weight of the power storage device 10. The weight of the weight 120 is appropriately determined as the weight required for adjusting the weight of the power storage device 10. The total weight of all the weights 120 included in the power storage device 10 is preferably 1 / 5 or more, more preferably 1 / 4 or more, and even more preferably 1 / 3 or more of the total weight of the power storage device 10. The material of the weight 120 is not particularly limited, and it can be formed of any metal member such as a steel plate, a plated steel plate, iron, aluminum, an aluminum alloy, or stainless steel that can be used for the case body 110.

[0038] As shown in FIG. 4, the weight 120 includes a pair of plate-like and rectangular weights 121 parallel to the XZ plane on both sides in the Y-axis direction, and a pair of plate-like and rectangular weights 122 parallel to the YZ plane on both sides in the X-axis direction. The weight 120 further includes a rectangular ring-shaped connecting member 123 and an auxiliary member 124 in the Z-axis plus direction of the pair of weights 121 and the pair of weights 122, as viewed from the Z-axis direction.

[0039] The weight 121 faces the outer case side wall 111 of the case body 110 and is arranged in a state of being in contact with the outer case side wall 111. The weight 121 is joined (fixed) to the outer case side wall 111 by welding (such as spot welding) or the like. In the present embodiment, a pair of weights 121 are joined (fixed) to the inner surfaces of the pair of outer case side walls 111. The weight 122 faces the outer case side wall 112 of the case body 110 and is arranged in a state of being in contact with the outer case side wall 112. The weight 122 is joined (fixed) to the outer case side wall 112 by welding (such as spot welding) or the like. In the present embodiment, a pair of weights 122 are joined (fixed) to the inner surfaces of the pair of outer case side walls 112. The weights 121 and 122 may be joined (fixed) to the outer case side walls 111 and 112 by adhesion with an adhesive or double-sided tape, welding, bolt connection, caulking joint, or the like. The weight 121 is shorter than the weight 122 in the length in the Z-axis direction. The Z-axis plus direction ends of the weight 121 and the weight 122 are arranged at the same position in the Z-axis direction. Thereby, a space is formed between the weight 121 in the Z-axis minus direction and the pair of weights 122, and the intermediate member 130 is arranged in this space.

[0040] The connecting member 123 and the auxiliary member 124 are members to which the partition wall 340 of the inner case 300 to be described later is fixed (see FIG. 7 and the like). That is, the connecting member 123 is a member that connects the outer case 100 and the upper wall (partition wall 340) of the inner case 300. A plurality of fixing portions 123a and 124a for fixing the power storage unit 20 (partition wall 340) are provided on the connecting member 123 and the auxiliary member 124. The connecting member 123 is joined (fixed) to the pair of weights 121 and the pair of weights 122 by welding or the like, and the auxiliary member 124 is joined (fixed) to the connecting member 123 by welding or the like. In the present embodiment, the connecting member 123 is divided into four members corresponding to each of the pair of weights 121 and the pair of weights 122, but it may be divided into any number of members or may be formed of one member. The same applies to the auxiliary member 124. The auxiliary member 124 is formed to be thinner in the Z-axis direction than the connecting member 123. The auxiliary member 124 is arranged along the gasket 900 and has a function of restricting the thickness of the gasket 900 in the Z-axis direction so as not to excessively crush the gasket 900. The auxiliary member 124 has the same thickness as the gasket 900 and is thinner than the thickness of the gasket 900 before being crushed.

[0041] The intermediate member 130 is a member to which the first fixing member 700 is fixed. By fixing the intermediate member 130 to the case body 110, the first fixing member 700 is fixed to the case body 110. Specifically, the intermediate member 130 is arranged surrounded by one weight 121, the pair of weights 122, and the outer case bottom wall 113, and is fixed to the case body 110 by being joined (fixed) to at least one of these by welding or the like. At least a part (the whole of the intermediate member 130 in the present embodiment) of the intermediate member 130 is arranged in the through portion 111a of the outer case side wall 111 when viewed from the Y-axis direction. In the present embodiment, a pair of intermediate members 130 are arranged on both sides of the outer case 100 in the Y-axis direction.

[0042] As shown in FIG. 4, the intermediate member 130 includes an intermediate member main body 131, an auxiliary member 132, and a gasket 133. The intermediate member main body 131 includes a rectangular annular frame body 131a that is long in the X-axis direction when viewed from the Y-axis direction, and a column portion 131b that is disposed at the central portion of the frame body 131a in the X-axis direction and extends in the Z-axis direction. The column portion 131b has a function of reinforcing the central portion of the frame body 131a in the X-axis direction and suppressing deformation of the frame body 131a. A plurality of fixing portions 131c for fixing the lid member 140 are provided on the frame body 131a and the column portion 131b. A plurality of fixing portions 131d for fixing the first fixing member 700 are provided on the frame body 131a.

[0043] Similar to the intermediate member main body 131, the auxiliary member 132 includes a rectangular annular frame body 132a that is long in the X-axis direction when viewed from the Y-axis direction, and a column portion 132b that is disposed at the central portion of the frame body 132a in the X-axis direction and extends in the Z-axis direction. A plurality of fixing portions 132c for fixing the lid member 140 are provided on the frame body 132a and the column portion 132b. The auxiliary member 132 is formed to be thinner in the Y-axis direction than the intermediate member main body 131, and is joined (fixed) to the intermediate member main body 131 by welding or the like. The gasket 133 is a rectangular annular gasket that is disposed on the intermediate member main body 131 along the outer periphery of the auxiliary member 132 and is long in the X-axis direction when viewed from the Y-axis direction. That is, the auxiliary member 132 is a member for increasing the bulk of the intermediate member main body 131. The gasket 133 is disposed in a stepped portion (groove portion) formed on the intermediate member main body 131 and on the outer periphery of the auxiliary member 132. The auxiliary member 132 is disposed along the gasket 133 and has a function of restricting the thickness of the gasket 133 in the Y-axis direction so as not to excessively crush the gasket 133.

[0044] The materials of the intermediate member body 131 and the auxiliary member 132 are not particularly limited, and they can be formed of any metal member such as a steel plate, a plated steel plate, iron, aluminum, an aluminum alloy, stainless steel, etc., that can be used for the case body 110. The material of the gasket 133 is also not particularly limited, and it can be formed of rubber such as natural rubber (NR), nitrile rubber (NBR), silicone rubber (Si), styrene-butadiene rubber (SBR), chloroprene rubber (CR), butyl rubber (IIR), ethylene-propylene rubber (EPDM), urethane rubber (U), fluororubber, etc., or a member having elasticity such as sponge, or any resin material that can be used for the terminal cover 260 of the power storage element unit 200 described later.

[0045] The lid member 140 is a member that closes the through-hole 111a in the outer case side wall 111 of the case body 110. The lid member 140 is fixed to the outer case side wall 111 by being attached to the intermediate member 130 to close the through-hole 111a. In the present embodiment, a pair of lid members 140 are arranged on both sides in the Y-axis direction of the outer case 100, and the through-holes 111a in the pair of outer case side walls 111 are closed by the pair of lid members 140. As shown in FIG. 2 and the like, the lid member 140 is a flat plate-shaped and rectangular member that is long in the X-axis direction parallel to the XZ plane, and includes a plurality of fixing portions 141 on the outer peripheral portion. The fixing portion 141 is a member that attaches (fixes) the lid member 140 to the intermediate member 130 by being fixed to the intermediate member 130. In the present embodiment, the fixing portion 141 is a bolt having a male screw portion, penetrates the fixing portion 132c of the auxiliary member 132, and is coupled to the female screw portion formed in the fixing portion 131c of the intermediate member body 131.

[0046] As described above, the outer case 100 is a rectangular parallelepiped, and a rectangular parallelepiped is a hexahedron. The outer case 100 is composed of six wall portions, and the wall portions constituting the outer case 100 are walls including at least one surface of the hexahedron. That is, the outer case side wall 111 and the lid member 140 form the wall portions of the outer case 100. The outer case side wall 111 in which the lid member 140 is not arranged and the through-hole 111a is formed may be defined as the wall portion of the outer case 100.

[0047] [1.2 Description of the power storage unit 20] Next, the power storage unit main body 30, the inner case 300, the elastic member 400, the connector 500, the electrical component 510, and the cover 600 included in the power storage unit 20 will be described in detail.

[0048] As shown in FIG. 5 and FIG. 7 described later, the power storage unit main body 30 includes a power storage element unit group 31, a first bus bar 41, a second bus bar 42, a first conductive member 513, and electrical components (such as the electrical component 511) that form part of the current path of the main circuit of the power storage unit main body 30. Specifically, the power storage unit main body 30 includes a plurality of power storage element unit groups 31 arranged in the X-axis direction (the second direction intersecting the first direction). In the present embodiment, six power storage element unit groups 31 are arranged side by side in the X-axis direction. Each of the plurality of power storage element unit groups 31 includes a plurality of power storage elements 200 arranged in the Z-axis direction (the first direction) and a third bus bar 43 that electrically connects the plurality of power storage elements 200. In the present embodiment, in each power storage element unit group 31, two power storage elements 200 are arranged side by side in the Z-axis direction. The number of power storage element unit groups 31 included in the power storage unit main body 30 and the number of power storage elements 200 included in the power storage element unit group 31 are not particularly limited, and any number of power storage element unit groups 31 may be arranged in the X-axis direction, and any number of power storage elements 200 may be arranged in the Z-axis direction. A plurality of power storage elements 200 (a plurality of power storage element unit groups 31) may be arranged in the Y-axis direction. The power storage unit main body 30 may include only one power storage element unit group 31. In the present embodiment, the plurality of power storage elements 200 included in the power storage element unit group 31 are connected in series, and the plurality of power storage element unit groups 31 are connected in parallel, but any of the power storage elements 200 may be connected in series or in parallel. A detailed description of the configuration of the power storage element 200 will be described later.

[0049] In this embodiment, two adjacent power storage element units 200 are in direct or indirect surface contact with each other. That is, the power storage element units 200 arranged in the X-axis direction are in surface contact in the X-axis direction, or are in surface contact in the X-axis direction on both surfaces of the member between the power storage element units 200. Examples of the member between the power storage element units 200 include an elastic member 421 or a member similar to the elastic member 420 described later. The power storage element units 200 arranged in the Z-axis direction are in surface contact in the Z-axis direction, or are in surface contact in the Z-axis direction on both surfaces of the member between the power storage element units 200. Examples of the member between the power storage element units 200 include a member similar to the elastic member 440 described later.

[0050] The inner case 300 is a substantially rectangular parallelepiped-shaped (box-shaped) container (inner box) that constitutes the inner case (housing) of the power storage device 10. The inner case 300 is disposed inside the outer case 100 (inside the outer case 100), houses and holds a plurality of power storage element units 200 (power storage unit main bodies 30), and protects them from impacts and the like. The inner case 300 is a metal case formed of a metal member such as a steel plate, a plated steel plate, iron, aluminum, an aluminum alloy, or stainless steel. In this embodiment, the inner case 300 is formed of a member of the same material as the outer case 100, but may be formed of a member of a different material from the outer case 100. The inner case 300 may be formed of an insulating member such as any resin material that can be used for the terminal cover 260 of the power storage element unit 200 described later.

[0051] The inner case 300 includes a pair of first wall members 310 that constitute a pair of long side walls of the inner case 300, a second wall member 320 that constitutes one short side wall, a third wall member 330 that constitutes the other short side wall and the bottom wall, and a partition wall 340 that constitutes the upper wall. In the present embodiment, the pair of first wall members 310, the second wall member 320, the third wall member 330, and the partition wall 340 are all configured separately. The third wall member 330 integrally includes a side wall 331 and a bottom wall 332 that are two walls facing different directions (X-axis direction and Z-axis direction). That is, the inner case 300 includes five wall members configured separately from each other. The inner case 300 may include four or three wall members in which any one of the wall members is integrated and configured separately. That is, the inner case 300 includes three or more wall members configured separately, and at least one of the three or more wall members (the third wall member 330) integrally includes two walls facing different directions. The side wall 331 and the bottom wall 332 of the third wall member 330 may be configured separately, and the inner case 300 may include six wall members configured separately.

[0052] The pair of first wall members 310 are flat plate-shaped and rectangular walls parallel to the XZ plane, which are arranged on both sides in the Y-axis direction of the power storage unit main body 30. The pair of first wall members 310 are joined (fixed) to the second wall member 320, the third wall member 330, and the partition wall 340 by means of bolting or the like. Each first wall member 310 is provided with a plurality of fixing portions 310b for fixing to the second wall member 320, a plurality of fixing portions 310c for fixing to the side wall 331 of the third wall member 330, and a plurality of fixing portions 310d for fixing to the bottom wall 332 of the third wall member 330. Further, the first wall member 310 is provided with a plurality of fixing portions 310a for fixing the first fixing member 700.

[0053] The second wall member 320 is a flat plate-shaped and rectangular wall parallel to the YZ plane, which is arranged in the +X-axis direction of the power storage unit main body 30. The second wall member 320 is joined (fixed) to the pair of first wall members 310, the bottom wall 332 and the partition wall 340 of the third wall member 330 by means of bolting or the like. The second wall member 320 is provided with a plurality of fixing portions 320a for fixing to the pair of first wall members 310, a plurality of fixing portions 320b for fixing to the bottom wall 332, and a plurality of fixing portions 320c for fixing to the partition wall 340.

[0054] The side wall 331 of the third wall member 330 is a flat plate-shaped and rectangular wall parallel to the YZ plane, which is arranged in the -X-axis direction of the power storage unit main body 30. The side wall 331 is joined (fixed) to the pair of first wall members 310 and the partition wall 340 by means of bolting or the like. The side wall 331 is provided with a plurality of fixing portions 331a for fixing to the pair of first wall members 310 and a plurality of fixing portions 331b for fixing to the partition wall 340.

[0055] The bottom wall 332 of the third wall member 330 is a flat plate-shaped and rectangular wall parallel to the XY plane, which is arranged in the -Z-axis direction of the power storage unit main body 30. The bottom wall 332 is joined (fixed) to the pair of first wall members 310 and the second wall member 320 by means of bolting or the like. The bottom wall 332 is provided with a plurality of fixing portions 332a for fixing to the pair of first wall members 310 and a plurality of fixing portions 332b for fixing to the second wall member 320.

[0056] The partition wall 340 is a flat plate-shaped and rectangular wall parallel to the XY plane, which is arranged in the +Z-axis direction of the power storage unit main body 30. The partition wall 340 is joined (fixed) to the pair of first wall members 310, the second wall member 320 and the side wall 331 of the third wall member 330 by means of bolting or the like. The partition wall 340 is provided with a plurality of fixing portions 342 for fixing to the pair of first wall members 310, the second wall member 320 and the side wall 331.

[0057] The partition wall 340 is further provided with a plurality of second fixing members 341 for fixing to the outer case 100, a plurality of openings 343 through which a first conductive member 513 described later penetrates, and a plurality of openings 344 through which a control wiring member 514 described later penetrates. A main circuit wiring member (second wiring member 516) penetrates through the opening 343 at the X-axis plus direction end. The plurality of second fixing members 341 are arranged at predetermined intervals over the entire circumference of the outer peripheral portion of the partition wall 340. The plurality of openings 343 are arranged at predetermined intervals from one end to the other end in the X-axis direction at the Y-axis minus direction end of the partition wall 340. The plurality of openings 344 are arranged at predetermined intervals from one end to the other end in the X-axis direction at the Y-axis plus direction end of the partition wall 340.

[0058] The second fixing member 341 is a member for attaching (fixing) the partition wall 340 to the outer case 100 by being fixed to the weight 120 of the outer case 100. In the present embodiment, the second fixing member 341 is a bolt having a male screw portion, penetrates through the fixing portion 124a of the auxiliary member 124 of the weight 120, and is coupled to the female screw portion formed in the fixing portion 123a of the connecting member 123. Thereby, since the partition wall 340 is fixed to the weight 120, the power storage unit 20 is fixed to the outer case 100. Since the partition wall 340 is disposed at a position closer to the opening 100a than the outer case bottom wall 113 of the outer case 100, the second fixing member 341 fixes the power storage unit 20 and the outer case 100 at a position closer to the opening 100a than the outer case bottom wall 113.

[0059] When the partition wall 340 is fixed to the weight 120, the space inside the outer case 100 is partitioned vertically. Thus, the partition wall 340 also serves to partition the space inside the outer case 100. That is, the space inside the outer case 100 is partitioned by the partition wall 340 which is a part of the inner case 300.

[0060] The pair of first wall members 310, second wall members 320, third wall members 330, and partition wall 340 may be joined by welding, adhesion, or the like. The pair of first wall members 310, second wall members 320, third wall members 330, and partition wall 340 may all be formed of members of the same material, or any of them may be formed of members of different materials. Depending on the size, shape, etc. of the power storage unit main body 30, the pair of first wall members 310, second wall members 320, third wall members 330, and partition wall 340 may have any shape. In this case, the pair of first wall members 310 may be short side walls, and the side walls 331 of the second wall members 320 and third wall members 330 may be long side walls.

[0061] The elastic member 400 is a member disposed between at least one of the two wall members sandwiching the plurality of power storage element units 200 provided in the inner case 300 and the plurality of power storage element units 200. The elastic member 400 is a sheet-like elastic member having functions such as tolerance absorption, vibration suppression, or anti-slip. The elastic member 400 can be formed of an elastic member or the like among those that can be used for the gasket 133 described above. In the present embodiment, the elastic member 400 is disposed between each of the two wall members sandwiching the power storage unit main body 30 and the power storage unit main body 30 in the three directions of the X-axis direction, Y-axis direction, and Z-axis direction.

[0062] Specifically, an elastic member 410 is disposed between the pair of first wall members 310 and the power storage unit main body 30 (such as the protruding portion 221 of the power storage element unit 200 described later). An elastic member 420 is disposed between the second wall member 320 and the power storage unit main body 30. Further, an elastic member 421 is disposed at the recessed position of the surface of the power storage element unit 200 in the +X-axis direction. An elastic member 430 is disposed between the side wall 331 of the third wall member 330 and the power storage unit main body 30. An elastic member 440 is disposed between the bottom wall 332 of the third wall member 330 and the power storage unit main body 30. An elastic member 450 is disposed between the partition wall 340 and the power storage unit main body 30.

[0063] With this configuration, the pair of first wall members 310 sandwich the power storage unit main body 30 while compressing it in the Y-axis direction. The side walls 331 of the second wall member 320 and the third wall member 330 sandwich the power storage unit main body 30 while compressing it in the X-axis direction. The bottom wall 332 and the partition wall 340 of the third wall member 330 sandwich the power storage unit main body 30 while compressing it in the Z-axis direction.

[0064] The connector 500 is a connector that electrically connects the power storage element unit 200 inside the power storage unit main body 30 and wiring outside the power storage device 10 (for example, wiring of an external charger not shown). The connector 500 is electrically connected to the power storage element unit 200 via a main circuit wiring member described later. The connector 500 is also connected to an electronic component (electronic circuit) provided in the electrical component 510 via a control wiring different from the control wiring member 514. The connector 500 is disposed on the partition wall 340, and the end in the positive X-axis direction protrudes from the connector opening 112a of the outer case 100 (see FIGS. 1 and 3, etc.). That is, at least a part of the connector 500 is disposed inside the outer case 100. The connector 500 may not protrude from the connector opening 112a, and all the connectors 500 may be disposed inside the outer case 100.

[0065] The electrical component 510 is an electrical component that is electrically connected to the power storage element unit 200 inside the power storage unit main body 30. The electrical component 510 is disposed on the partition wall 340. The electrical component 510 includes an electronic component such as a circuit board, a relay (magnetic contactor), a fuse, a current sensor (Hall sensor), and wiring for monitoring or controlling the state (voltage, temperature, charge / discharge state, etc.) of the power storage element unit 200.

[0066] The cover 600 is a cover member that covers the electrical component 510. The cover 600 is disposed on the partition wall 340 so as to cover the electrical component 510 on the partition wall 340. The cover 600 also covers the fixing portion 342, the opening 343, and the opening 344 of the partition wall 340 (see FIG. 3). That is, within the range covered by the cover 600, the electrical component 510, and the fixing portion 342, the opening 343, and the opening 344 of the partition wall 340 are disposed. The gap between the cover 600 and the partition wall 340 is filled by caulking or welding or the like, and waterproof treatment is performed. Thereby, in a state where the partition wall 340 divides the space inside the outer case 100 vertically, the power storage unit main body 30 is waterproofed, and the electrical component 510 and the like are waterproofed.

[0067] The cover 600 is a box-shaped member and includes a wire holding portion 610 on the side surface in the positive X-axis direction. The wire holding portion 610 is a member for inserting and holding a wire. The side surface of the cover 600 and the wire holding portion 610 face the connector 500. In each wire holding portion 610, a main circuit wiring member for the positive and negative electrodes for charging, a control wiring member (not shown), and the like are inserted and held. One end of the wire for charging is connected to the connector 500, and the other end is connected to the main circuit wiring member inside the cover 600. The wire holding portion 610 has waterproof properties and prevents water from entering the cover 600. The wire holding portion 610 also holds a wire for discharging (not shown). The wire holding portion 610 may hold a wire for both charging and discharging.

[0068] [1.3 Explanation of the first fixing member 700] Next, the first fixing member 700 will be described in detail.

[0069] The first fixing member 700 is a member that is housed in the outer case 100 and fixes the power storage unit 20 and the outer case 100. The first fixing member 700 is fixed to the first wall member 310 of the inner case 300 of the power storage unit 20 and the intermediate member 130 of the outer case 100. Thereby, the first fixing member 700 is disposed at a position facing the through-hole 111a of the outer case side wall 111 of the outer case 100 (a position where at least a part of the first fixing member 700 is exposed from the through-hole 111a). In the present embodiment, a plurality of first fixing members 700 are arranged corresponding to the plurality of through-holes 111a of the outer case 100. Specifically, two first fixing members 700 are arranged corresponding to the two through-holes 111a formed in the pair of outer case side walls 111 of the case body 110.

[0070] As shown in FIG. 2, the first fixing member 700 includes two fixing member main bodies 710 arranged in the X-axis direction, and a plurality of reinforcing portions 720 provided on the two fixing member main bodies 710. The two fixing member main bodies 710 are arranged on both sides in the X-axis direction of the column portion 131b of the intermediate member main body 131 of the intermediate member 130. Each fixing member main body 710 is a plate-like member that is L-shaped when viewed from the X-axis direction and extends in the X-axis direction. The reinforcing portion 720 is a triangular and plate-like reinforcing rib when viewed from the X-axis direction.

[0071] Each fixing member main body 710 includes a plurality of fixing portions 711 for fixing to the outer case 100 and a plurality of fixing portions 712 for fixing to the power storage unit 20. The fixing portion 711 is arranged at a flat plate-like portion parallel to the XY plane at the end in the minus Z-axis direction of the fixing member main body 710. The fixing portion 711 is a bolt having a male screw portion, and is coupled to a female screw portion formed in the fixing portion 131d of the intermediate member main body 131 of the intermediate member 130. The fixing portion 712 is arranged at a flat plate-like portion parallel to the XZ plane at the end in the plus Y-axis direction of the fixing member main body 710. The fixing portion 712 is a bolt having a male screw portion, and is coupled to a female screw portion formed in the fixing portion 310a of the first wall member 310 of the inner case 300. The reinforcing portion 720 is arranged at a position adjacent in the X-axis direction to each of the fixing portion 711 and the fixing portion 712 having the same position in the X-axis direction.

[0072] [1.4 Explanation of Elastic Member 800 and Gasket 900] Next, the elastic member 800 and the gasket 900 will be described in detail.

[0073] The elastic member 800 is a member disposed between the power storage unit 20 and the outer case bottom wall 113 of the outer case 100. Similar to the elastic member 400, the elastic member 800 is a sheet-like elastic member having functions such as tolerance absorption, vibration suppression, or anti-slip. The elastic member 800 can be formed of any member or the like that can be used for the elastic member 400.

[0074] The gasket 900 is a member disposed between the partition wall 340 of the inner case 300 of the power storage unit 20 and the outer case 100. The gasket 900 is a rectangular annular member disposed along the outer peripheral portion outside the second fixing member 341 on the partition wall 340. Specifically, the gasket 900 is disposed between the partition wall 340 and the weight 120. In the present embodiment, the gasket 900 is divided into four members corresponding to each of the pair of weights 121 and the pair of weights 122, but it may be divided into any number of members or may be formed of one member. The gasket 900 can be formed of any member or the like that can be used for the gasket 133 of the intermediate member 130.

[0075] [2 Explanation of Power Storage Element Unit 200] Next, the configuration of the energy storage element unit 200 will be described in detail. FIG. 6 is a perspective view showing the configuration of the energy storage element unit 200 according to the present embodiment. FIG. 6(a) shows an enlarged view of one energy storage element unit 200 shown in FIG. 5, and the energy storage element 210 and the external terminals 250 located inside are shown by broken lines. FIG. 6(b) is a perspective view showing the end portion of the energy storage element unit 200 in the +Y-axis direction when the energy storage element unit 200 shown in FIG. 6(a) is viewed from the opposite side (+Y-axis direction). Since the plurality of energy storage element units 200 included in the energy storage device 10 (energy storage unit 20, energy storage unit main body 30) all have the same configuration, in FIG. 6, one energy storage element unit 200 is shown, and hereinafter, the configuration of one energy storage element unit 200 will be described in detail.

[0076] The energy storage element unit 200 is a substantially rectangular parallelepiped battery module (battery pack) that can charge electricity from the outside and discharge electricity to the outside. As shown in FIG. 6, the energy storage element unit 200 includes a plurality of energy storage elements 210, a pair of end plates 220, a pair of side plates 230, an exterior member 240, a pair (positive and negative) of external terminals 250, and a pair (positive and negative) of terminal covers 260. In addition to the above configuration, the energy storage element unit 200 also includes spacers disposed between the energy storage elements 210, bus bars connecting the terminals 212 of the plurality of energy storage elements 210, and a bus bar frame for positioning the bus bars, etc., but illustration and detailed description thereof are omitted.

[0077] In the present embodiment, the depth direction (front-rear direction) of the energy storage element unit 200 is along the Y-axis direction (third direction). The surface of the side plate 230 in the -Y-axis direction in the -Y-axis direction and the surface of the exterior member 240 in the -Y-axis direction are referred to as the front surface of the energy storage element unit 200. The surface of the side plate 230 in the +Y-axis direction in the +Y-axis direction and the surface of the exterior member 240 in the +Y-axis direction are referred to as the rear surface of the energy storage element unit 200. The pair of external terminals 250 are disposed on the front surface of the energy storage element unit 200.

[0078] The energy storage element 210 is a secondary battery (single cell) that can charge and discharge electricity. More specifically, it is a non-aqueous electrolyte secondary battery such as a lithium-ion secondary battery. In the present embodiment, a plurality of energy storage elements 210 are arranged side by side in the Y-axis direction and the Z-axis direction, but the arrangement direction and the number of the energy storage elements 210 are not particularly limited. In the present embodiment, the energy storage element 210 has a rectangular parallelepiped shape (angular shape) that is flat in the Z-axis direction, but the shape of the energy storage element 210 is not limited to the rectangular parallelepiped shape, and may be a polygonal prism shape, a cylindrical shape, an elliptical cylindrical shape, an elliptical prism shape, etc. other than the rectangular parallelepiped shape. The energy storage element 210 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or may be a capacitor. The energy storage element 210 may be a primary battery instead of a secondary battery. The energy storage element 210 may be a battery using a solid electrolyte. The energy storage element 210 may be a pouch-type energy storage element.

[0079] The energy storage element 210 includes a container 211 and terminals 212 which are a pair of (positive and negative) electrode terminals. Inside the container 211, an electrode body, a pair of (positive and negative) current collectors, an electrolytic solution (non-aqueous electrolyte), etc. are accommodated, but the illustration and detailed description thereof are omitted. The container 211 includes a container body having an opening formed therein and a lid portion that closes the opening of the container body, and the terminals 212 are arranged in a state of protruding in the negative X-axis direction from the lid portion. The terminals 212 are electrically connected to the positive electrode plate and the negative electrode plate of the electrode body via a conductive current collector. The electrode body is an energy storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator.

[0080] A pair of end plates 220 and a pair of side plates 230 are restraining members that sandwich a plurality of power storage elements 210 from both sides in the Z-axis direction, thereby pressing (restraining) each power storage element 210 from both sides in the Z-axis direction. The restraining members are composed of a first restraining member (end plate 220) and a second restraining member (side plate 230). In other words, a pair of end plates 220 and a pair of side plates 230 are holding members that hold a plurality of power storage elements 210. The holding members are composed of a first holding member (end plate 220) and a second holding member (side plate 230). The end plates 220 and the side plates 230 are formed of members made of metal such as steel or stainless steel from the viewpoint of ensuring strength, etc., but their materials are not particularly limited, and they may be formed of highly insulating members, or the metal members may be subjected to insulation treatment.

[0081] A pair of end plates 220 are arranged on both sides of a plurality of power storage elements 210 in the Z-axis direction, and are plate-shaped and rectangular members that sandwich and hold the plurality of power storage elements 210 from both sides in the Z-axis direction. The end plates 220 may be flat block-shaped members or the like instead of plate-shaped. The end plates 220 are provided with a protruding portion 221 protruding in the minus Y-axis direction and a protruding portion 222 protruding in the plus Y-axis direction. Concave portions 221a are formed on both sides in the X-axis direction of the protruding portion 221, and concave portions 222a are formed on both sides in the X-axis direction of the protruding portion 222. The end face (front end face) in the minus Y-axis direction of the protruding portion 221 has a front end face 221c that is a flat surface, and the end face (front end face) in the plus Y-axis direction of the protruding portion 222 has a front end face 222c that is a flat surface. In the present embodiment, both of the pair of end plates 220 are provided with protruding portions 221 and concave portions 221a and protruding portions 222 and concave portions 222a having the same configuration.

[0082] The protruding portion 221 is a rectangular portion extending in the X-axis direction that protrudes in the minus Y-axis direction from the substantially central portion in the X-axis direction at the minus Y-axis direction end of the end plate 220. The protruding portion 221 is provided with a fixing portion 221b, such as a bolt, for fixing the end plate 220 to the side plate 230. The protruding portion 221 protrudes in a predetermined direction (minus Y-axis direction) from the external terminal 250. The protruding portion 222 is a rectangular portion extending in the X-axis direction that protrudes in the plus Y-axis direction from the substantially central portion in the X-axis direction at the plus Y-axis direction end of the end plate 220. The protruding portion 222 is provided with a fixing portion 222b, such as a bolt, for fixing the end plate 220 to the side plate 230.

[0083] The pair of side plates 230 are plate-shaped and rectangular members arranged on both sides in the Y-axis direction of the plurality of power storage elements 210. The side plates 230 have both ends in the Z-axis direction attached to the ends in the Y-axis direction of the pair of end plates 220, and by connecting the pair of end plates 220, the plurality of power storage elements 210 are constrained. The side plates 230 extend in the Z-axis direction so as to straddle the plurality of power storage elements 210, and apply a constraining force in the Z-axis direction to the plurality of power storage elements 210. The side plates 230 may be long rod-shaped members or the like instead of plate-shaped.

[0084] The exterior member 240 is a member that covers the X-axis minus direction of a plurality of power storage elements 210 and the like, and protects the plurality of power storage elements 210 and the like from external impacts and the like. In the present embodiment, the exterior member 240 is a metal member, but it may also be a resin member. At the Z-axis plus direction end portion in the Y-axis plus direction end portion of the exterior member 240, an opening 241 through which a control wiring member 514 (see FIG. 8) including wiring for monitoring or controlling the state (voltage, temperature, charge / discharge state, etc.) of the power storage element 210 passes is formed. The opening 241 is disposed on the rear surface, which is opposite to the front surface of the power storage element unit 200, in the Y-axis direction (the third direction). The exterior member 240 is attached and fixed to a pair of end plates 220 and a pair of side plates 230. Recesses 242 extending in the Y-axis direction are formed at both ends of the exterior member 240 in the Z-axis direction, and fixing portions 243 with the pair of end plates 220 are disposed in the recesses 242. Thereby, the fixing portion 243 is suppressed from protruding from the outer surface (the end surface in the X-axis minus direction) of the exterior member 240. In the present embodiment, the fixing portion 243 does not protrude from the outer surface (the end surface in the X-axis minus direction) of the exterior member 240.

[0085] The external terminal 250 is an external terminal that is electrically connected to the terminal 212 of the power storage element 210, charges electricity from the outside, and discharges electricity to the outside. The external terminal 250 is a terminal member different from the terminal 212 of the power storage element 210. The external terminal 250 is formed of a metal conductive member such as aluminum, aluminum alloy, copper, copper alloy, nickel, or a combination thereof, or a conductive member other than metal. In the present embodiment, a pair (positive electrode and negative electrode) of external terminals 250 arranged in the Z-axis direction are disposed at the X-axis minus direction end portion and both ends in the Z-axis direction in the Y-axis minus direction end portion of the power storage element unit 200. The external terminal 250 protrudes in a predetermined direction (Y-axis minus direction) from the main body portion (the portion where the power storage element 210 is disposed) of the power storage element unit 200. Specifically, the external terminal 250 protrudes in the Y-axis minus direction from the Y-axis minus direction surface of the side plate 230 in the Y-axis minus direction and the Y-axis minus direction surface of the exterior member 240.

[0086] The terminal cover 260 is a cover member of the external terminal 250 that is arranged to cover the external terminal 250 and insulate and protect the external terminal 250. An opening (not shown) through which a conductive member such as a bus bar connected to the external terminal 250 passes is formed in the terminal cover 260. The terminal cover 260 is formed of an insulating member such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyether ether ketone (PEEK), tetrafluoroethylene - perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether sulfone (PES), polyamide (PA), ABS resin, or a composite material thereof. The terminal cover 260 may be formed of a metal or the like with an insulating coating. Thereby, the terminal cover 260 protects the external terminal 250 and avoids the external terminal 250 from contacting an external metal member or the like.

[0087] [Explanation of the positional relationship of the components included in the power storage device 10] Next, the positional relationship of the components included in the power storage device 10 will be described in detail. FIG. 7 is a cross - sectional view showing the positional relationship of the components included in the power storage device 10 according to the present embodiment. In FIG. 7, the power storage device 10 is cut along a plane parallel to the XZ plane located between the elastic member 410 in the minus Y - axis direction and the power storage unit main body 30, and the configuration when viewed from the minus Y - axis direction is shown. FIG. 8 is a top view showing the positional relationship of the components included in the power storage device 10 according to the present embodiment. FIG. 8 shows the configuration when viewed from the plus Z - axis direction after removing members other than the first bus bar 41 and the electrical component 511 (partition wall 340, other electrical components 510, cover 600, etc.) among the members located in the plus Z - axis direction relative to the power storage unit main body 30 from the power storage device 10.

[0088] As shown in FIG. 7, the side walls 331 of the second wall member 320 and the third wall member 330 of the inner case 300 sandwich a plurality of power storage element units 200 in the X-axis direction and are in contact with the plurality of power storage element units 200 in the X-axis direction (indirectly in contact via elastic members 420, 430, etc.). The bottom wall 332 and the partition wall 340 of the third wall member 330 sandwich a plurality of power storage element units 200 in the Z-axis direction and are in contact with the plurality of power storage element units 200 in the Z-axis direction (indirectly in contact via elastic members 440, 450). As shown in FIG. 8, a pair of first wall members 310 sandwich a plurality of power storage element units 200 in the Y-axis direction and are in contact with the plurality of power storage element units 200 in the Y-axis direction (indirectly in contact via an elastic member 410).

[0089] A pair of first wall members 310, which are two wall members included in the inner case 300, sandwich a plurality of power storage element units 200 at the position of the protruding portion 221 of the end plate 220. That is, as described above, in the power storage element unit 200, the protruding portion 221 of the end plate 220 protrudes in the negative Y-axis direction from the external terminal 250. Further, the protruding portion 221 protrudes in the negative Y-axis direction from the terminal cover 260 (see FIG. 12). In the negative Y-axis direction of the protruding portion 221, the first wall member 310 is disposed, and the protruding portion 221 is in contact with the first wall member 310 in the Y-axis direction (indirectly in contact via the elastic member 410). That is, the external terminal 250 and the terminal cover 260 are disposed apart from the first wall member 310 without contacting the first wall member 310.

[0090] Similarly, a pair of first wall members 310, which are two wall members, sandwich a plurality of power storage element units 200 at the position of the protruding portions 222 of the end plate 220. That is, in the +Y-axis direction of the protruding portion 222 protruding in the +Y-axis direction, the other first wall member 310 is arranged, and the protruding portion 222 contacts the first wall member 310 in the Y-axis direction (indirectly through the other elastic member 410). In this way, the pair of first wall members 310 sandwich the plurality of power storage element units 200 in the Y-axis direction at the positions of the protruding portions 221 and 222 in the Z-axis direction. The front end surface 221c, which is a flat surface, of the protruding portion 221 is in surface contact with one of the first wall members 310, and the front end surface 222c, which is a flat surface, of the protruding portion 222 is in surface contact with the other first wall member 310.

[0091] With such a configuration, a recess is formed between the two external terminals 250 provided in two adjacent power storage element units 200 in the Z-axis direction, and the two recesses 221a are connected. A bus bar or wiring or the like connected to the external terminal 250 passes through the recess 221a. That is, the recess 221a is formed to have a size through which the bus bar or wiring or the like can pass.

[0092] As described above, the power storage unit main body 30 includes six power storage element unit groups 31 arranged in the X-axis direction (second direction), and each of the plurality of power storage element unit groups 31 includes two power storage element units 200 arranged in the Z-axis direction (first direction). As shown in FIG. 6, each of the plurality of power storage element units 200 includes a pair of external terminals 250 arranged in the Z-axis direction (first direction). As shown in FIG. 7, in each power storage element unit group 31, by setting the arrangement direction (stacking direction) of the power storage element units 200 included in the power storage element unit group 31 and the arrangement direction of the pair of external terminals 250 of the power storage element unit 200 in the same direction (Z-axis direction), four external terminals 250 are arranged in the Z-axis direction. In the power storage unit main body 30, the power storage element unit groups 31 are arranged in the direction (X-axis direction) intersecting the direction in which the pair of external terminals 250 are arranged, so that the external terminals 250 included in each of the six power storage element unit groups 31 are arranged in the X-axis direction. More specifically, the external terminals 250 having the same potential in each power storage element unit group 31 are arranged in the X-axis direction at the same position in the Z-axis direction.

[0093] The plurality of power storage element unit groups 31 are connected in parallel. Specifically, the power storage unit main body 30 further includes a first bus bar 41 and a second bus bar 42 which are a pair of bus bars 40. The pair of bus bars 40 (the first bus bar 41 and the second bus bar 42) extend in the X-axis direction (second direction) and connect the plurality of power storage element unit groups 31 in parallel. The plurality of power storage element units 200 included in each of the plurality of power storage element unit groups 31 are connected in series. Specifically, the power storage element unit group 31 further includes a third bus bar 43. The third bus bar 43 extends in the Z-axis direction and connects the plurality of power storage element units 200 in series. The third bus bar 43 passes through the recess 221a of the end plate 220 of the two power storage element units 200. The first bus bar 41, the second bus bar 42, and the third bus bar 43 are formed of a metal conductive member such as aluminum, an aluminum alloy, copper, a copper alloy, nickel, or a combination thereof, or a conductive member other than metal. Since the first bus bar 41, the second bus bar 42, and the third bus bar 43 are plate-like members, the connection work is easier than that of a cable (electric wire) or the like.

[0094] In this embodiment, the first bus bar 41 is connected to each power storage element unit group 31 via the first conductive member 513. That is, the power storage unit 20 includes the first conductive members 513 connected to each of the plurality of power storage element unit groups 31. The first conductive member 513 is connected to the external terminal 250 at the plus Z-axis direction end among the external terminals 250 of the power storage element units 200 included in each power storage element unit group 31. Further, each first conductive member 513 is electrically connected to the first bus bar 41. Specifically, the first conductive member 513 is connected to the first bus bar 41 via the electrical component 511. More specifically, the first conductive member 513 passes through the recess 221a of the power storage element unit 200 located in the plus Z-axis direction of the external terminal 250 from the external terminal 250, penetrates the opening 343 of the partition wall 340, and is connected to the electrical component 511. In this way, the first conductive member 513 electrically connects the power storage element unit 200 and the electrical component 511. Thereby, the first conductive member 513 is connected to the first bus bar 41 connected to the electrical component 511. In this embodiment, the first conductive member 513 is a cable (electric wire), but may also be a conductive member such as a bus bar. The electrical component 511 is a magnetic contactor (electromagnetic contactor, MC), but may also be a fuse or the like. When the first conductive member 513 passes through the electrical component 512, the current flowing through the first conductive member 513 is measured. The electrical component 512 is a Hall sensor.

[0095] With such a configuration, as shown in FIG. 8, the first bus bar 41 is arranged at a position in the plus Z-axis direction of the plurality of power storage element unit groups 31 and overlapping the plurality of power storage element unit groups 31 when viewed from the Z-axis direction. In this way, the plurality of power storage element unit groups 31 are connected in parallel by the bus bar 40 (first bus bar 41) arranged at a position in the Z-axis direction (first direction) of the plurality of power storage element unit groups 31 and overlapping the plurality of power storage element unit groups 31 when viewed from the Z-axis direction (first direction).

[0096] One and the other of the main circuit wiring members (the positive electrode wiring member and the negative electrode wiring member) of the positive electrode and the negative electrode, through which the currents flowing through the respective power storage element unit groups 31 are integrated, are connected to the first bus bar 41 and the second bus bar 42. In the present embodiment, the first wiring member 515, which is the main circuit wiring member (positive electrode wiring member) of the positive electrode, is connected to the first bus bar 41. The second wiring member 516, which is the main circuit wiring member (negative electrode wiring member) of the negative electrode, is connected to the second bus bar 42. The positive electrode wiring member and the negative electrode wiring member are each composed of a plurality of wiring members, pass through the wire holding portion 610 provided in the cover 600, and are connected to the connector 500. The wire holding portion 610 is configured to be able to seal between the wire holding portion 610 and the main circuit wiring member and between the wire holding portion 610 and the cover 600. The wire holding portion 610 is a cable ground, but may also have a structure that fills the gap with caulking or the like.

[0097] As shown in FIG. 8, the power storage unit 20 further includes a control wiring member 514 for controlling at least one power storage element unit 200 among the plurality of power storage element units 200. The control wiring member 514 is derived from the rear surface of the power storage element unit 200, which is located on the opposite side of the pair of external terminals 250 of the plurality of power storage element units 200 in the Y-axis direction (the third direction intersecting the first direction and the second direction). In the present embodiment, the control wiring member 514 is provided with harness connectors (not shown) at both ends and is connected to the mating harness connector inside the opening 241 on the rear surface of the power storage element unit 200. Thereby, in each power storage element unit 200, the control wiring member 514 is derived from the opening 241 formed at the Y-axis positive direction end of the exterior member 240. The control wiring member 514 derived from the opening 241 is connected to the connector 500 via the electronic components (electronic circuits) and wiring etc. provided in the electrical component 510 (such as the wiring passing through the cover 600). In the present embodiment, the control wiring member 514 is a cable (wire) including various wirings such as wiring for monitoring or controlling the state (voltage, temperature, charge and discharge state, etc.) of the power storage element 210, wiring for controlling the electrical component 510, and wiring for communication, but may also be a conductive member such as a bus bar.

[0098] As shown in FIG. 7, the partition wall 340 divides the space inside the outer case 100 into a first space S1 and a second space S2 arranged in the Z-axis direction. The power storage element unit 200 (power storage unit main body 30) is disposed in the first space S1. At least a part of the connector 500 is disposed in the second space S2. Further, in the second space S2, an electrical component 510 and a cover 600 covering the electrical component 510 are disposed.

[0099] As described above, the opening 343 of the partition wall 340 is disposed within the range where the cover 600 covers the electrical component 510 (a position overlapping the cover 600 when viewed from the Z-axis direction), and the first conductive member 513 penetrates the opening 343. For this reason, the first conductive member 513 penetrates the partition wall 340 within the range where the cover 600 covers the electrical component 510. Similarly, the opening 344 of the partition wall 340 is disposed within the range where the cover 600 covers the electrical component 510 (a position overlapping the cover 600 when viewed from the Z-axis direction), and the control wiring member 514 penetrates the opening 344. For this reason, the control wiring member 514 penetrates the partition wall 340 within the range where the cover 600 covers the electrical component 510.

[0100] The connector 500 is disposed outside the cover 600 and is not disposed within the range where the cover 600 covers the electrical component 510 (see FIG. 3). Since the connector 500 and its peripheral portion are boundary portions with the outside of the power storage device 10, the degree of freedom in design can be increased by not providing a waterproof structure. A waterproof connector can be selected for the connector 500 itself, or a waterproof cover can be provided from the outside around the connector 500.

[0101] [Description of the Partition Wall 340 and the Configuration Around It] Next, the partition wall 340 and its surrounding configuration will be described in detail. FIG. 9 is a cross-sectional view and a side view showing the partition wall 340 and its surrounding configuration according to the present embodiment. (a) of FIG. 9 is an enlarged cross-sectional view showing the X-axis positive direction end portion of the partition wall 340 in FIG. 7 and its surrounding configuration. (b) of FIG. 9 is a side view showing the configuration when the opening 112b formed in the outer case side wall 112 in the X-axis positive direction provided in the outer case 100 is viewed from the X-axis positive direction.

[0102] As shown in FIG. 7, the partition wall 340 divides the space inside the outer case 100 into a first space S1 and a second space S2 arranged in a predetermined direction. In the present embodiment, the predetermined direction is the Z-axis direction, which is the direction in which gravity acts (the direction in which an object falls), the vertical direction, or the plumb direction. The Z-axis negative direction of the flat partition wall 340 is the first space S1, and the Z-axis positive direction of the partition wall 340 is the second space S2. The first space S1 and the second space S2 are spaces having different positions in the Z-axis direction and do not overlap when viewed from a direction orthogonal to the Z-axis direction (horizontal direction).

[0103] As shown in FIG. 9, a gasket 900 is disposed between the surface 345 of the partition wall 340 facing the first space S1 and the outer case 100. The surface 345 is the surface (lower surface, back surface) of the partition wall 340 in the Z-axis negative direction. The gasket 900 seals between the first space S1 and the second space S2, making the first space S1 in which the power storage element unit 200 (power storage unit main body 30) is accommodated a waterproof space. The gasket 900 may be an O-ring. Since there is a step portion on the upper surface 120a of the weight 120 (connecting member 123) inside the outer case 100, it is easy to arrange the partition wall 340 and the gasket 900 inside the outer case 100. Therefore, it is easy to make the first space S1 a waterproof space.

[0104] Specifically, the gasket 900 is disposed between the surface 345 of the partition wall 340 and the weight 120. More specifically, the gasket 900 is disposed between the surface 345 of the partition wall 340 and the connecting member 123 and the auxiliary member 124 of the weight 120. That is, the gasket 900 is disposed across the connecting member 123 and the auxiliary member 124 and is compressed when the second fixing member 341 fixes the partition wall 340 to the connecting member 123. At this time, the gasket 900 is compressed between the partition wall 340 and the connecting member 123. However, due to the arrangement of the auxiliary member 124, the compression between the partition wall 340 and the connecting member 123 is not less than the thickness of the auxiliary member 124. In this way, the auxiliary member 124 has a function of suppressing excessive compression of the gasket 900. Thereby, it is suppressed that the sealing performance by the gasket 900 is impaired due to damage or the like of the gasket 900.

[0105] The gasket 900 is disposed at a position facing the opening 112b formed in the outer case side wall 112 in the +X-axis direction of the outer case 100 (a position where a part of the gasket 900 can be seen from the opening 112b). In other words, at least a part of the gasket 900 (a part of the end portion in the +X-axis direction) is disposed within the opening 112b when viewed from the opening direction of the opening 112b. In the present embodiment, the gasket 900, the connection member 123, and the partition wall 340 are disposed within the opening 112b when viewed from the opening direction (X-axis direction) of the opening 112b. That is, the boundary portion between the gasket 900 and the connection member 123 and the boundary portion between the gasket 900 and the partition wall 340 are disposed within the opening 112b when viewed from the X-axis direction. The gasket 900 is disposed spaced apart from the outer case side wall 112, and the connection member 123 is disposed in contact with the outer case side wall 112. In this way, it is desirable that at least the boundary portion between the gasket 900 and the weight 120 (connection member 123) (the lower end of the gasket 900) can be seen from the opening 112b. Since the lower end of the opening 112b is located below the upper surface of the connection member 123, water or dew condensation water that has entered the second space S2 within the outer case 100 is discharged from the opening 112b to the outside of the outer case 100. The same applies to the opening 112b formed in the outer case side wall 112 in the -X-axis direction of the outer case 100. The same also applies to the openings 111b formed in the outer case side walls 111 on both sides in the Y-axis direction of the outer case 100.

[0106] In the above, the outer case 100 is an example of a "case", and the first conductive member 513 is an example of a "conductive member".

[0107] It is more preferable to also seal between the periphery of the opening 112b and the side surface of the connection member 123. Further, in order to waterproof between the weight 120 and the case body 110, it is preferable that the entire circumference between the weight 120 (connection member 123, etc.) and the case body 110 is caulked. The entire circumference between the weight 120 (connection member 123, etc.) and the case body 110 may be welded.

[0108] As described above, the power storage device 10 includes a power storage element unit 200 including a power storage element 210, an outer case 100 that houses the power storage element unit 200, and a connector 500 to which wiring outside the power storage device 10 is electrically connected. The power storage device 10 includes a main circuit wiring member (including a first conductive member 513) that electrically connects the power storage element unit 200 and the connector 500. The power storage device 10 includes a partition wall 340 that divides the space inside the outer case 100 into a first space S1 and a second space S2 arranged in a predetermined direction, and a gasket 900 disposed between the surface of the partition wall 340 facing the first space S1 and the outer case 100. The portion of the outer case 100 that forms the first space S1 is sealed with respect to the second space S2 (the wall portion of the outer case 100 forms a sealed state). The portion of the partition wall 340 that forms the first space S1 is sealed with respect to the second space S2. The power storage element unit 200 is disposed in the first space S1, and at least a part of the connector 500 is disposed in the second space S2. Among the main circuit wiring members, the portion on the side connected to the power storage element unit 200 is sealed with respect to the second space S2 (the portion of the wire holding portion 610 is sealed) while passing through the partition wall 340.

[0109] The power storage device 10 includes an electrical component 510 electrically connected to the power storage element unit 200 and a cover 600 that covers the electrical component 510. The cover 600 is disposed on the side opposite to the first space S1 of the partition wall 340, and a third space S3 (see FIG. 9) is formed by the partition wall 340 and the cover 600. The portion of the cover 600 that forms the third space S3 is sealed with respect to the space (the second space S2 other than the third space S3) in which at least a part of the connector 500 is disposed, and the electrical component 510 is disposed in the third space S3.

[0110] The main circuit wiring member includes a first conductive member 513 that electrically connects the power storage element unit 200 and the electrical component 510. The first conductive member 513 passes through the partition wall 340 within the range where the cover 600 covers the electrical component 510.

[0111] [Description of Effects] As described above, according to the power storage device 10 according to the embodiment of the present invention, a gasket 900 is disposed between the surface 345 of the partition wall 340 facing the first space S1, which partitions the space inside the outer case 100 into the first space S1 and the second space S2, and the outer case 100. The power storage element unit 200 including the power storage element 210 is disposed in the first space S1, and at least a part of the connector 500 is disposed in the second space S2. In this way, by disposing the gasket 900 between the surface 345 of the partition wall 340 facing the first space S1 and the outer case 100, the sealing property (such as waterproof property) between the first space S1 and the second space S2 can be improved. Thereby, the sealing property between the power storage element unit 200 including the power storage element 210 and the connector 500 can be improved with a simple configuration. That is, since the first space S1 can be made into a waterproof space, the power storage element unit 200 (the power storage unit main body 30) can be waterproofed. By disposing the connector 500 in the second space S2, the waterproof treatment around the connector 500 can be made unnecessary. Therefore, in the power storage device 10 including the connector 500 and the power storage element unit 200 including the power storage element 210, the sealing property of the accommodation portion of the power storage element unit 200 can be ensured with a simple configuration.

[0112] Even when the electrical component 510 is disposed in the second space S2, the sealing property (such as waterproof property) of the electrical component 510 can be improved by covering the electrical component 510 with the cover 600.

[0113] When connecting the power storage element unit 200 and the electrical component 510 with the first conductive member 513, the first conductive member 513 is disposed to penetrate the partition wall 340 within the range where the cover 600 covers the electrical component 510. Thereby, it is possible to suppress a decrease in the sealing property (such as waterproof property) between the first space S1 and the second space S2 due to the first conductive member 513 penetrating the partition wall 340.

[0114] When the outer case 100 includes the weight 120, by disposing the gasket 900 between the partition wall 340 and the weight 120, the sealing property (such as waterproof property) between the first space S1 and the second space S2 can be improved by using the weight 120.

[0115] By making the partition wall 340 a part of the inner case 300, a part of the inner case 300 can be utilized to improve the sealing property (such as waterproof property) between the first space S1 and the second space S2. By housing the power storage element unit 200 in the inner case 300, the sealing property between the power storage element unit 200 and the connector 500 can be improved.

[0116] Since at least a part of the gasket 900 is disposed within the openings 111b, 112b as viewed from the opening directions of the openings 111b, 112b of the outer case 100, the openings 111b, 112b are provided near the boundary between the outer case 100 and the partition wall 340. Therefore, when water enters the second space S2, for example, the water flowing from the second space S2 toward the first space S1 can be discharged (drained) from the openings 111b, 112b. Thereby, the entry of water into the first space S1 can be suppressed.

[0117] [Description of Modification Example 6] As described above, the power storage device 10 according to the embodiment of the present invention has been described. However, the present invention is not limited to this embodiment. The embodiments disclosed this time are illustrative in all respects, and the scope of the present invention includes all modifications within the meaning and scope equivalent to the claims.

[0118] In the above embodiment, the first space S1 and the second space S2 are arranged in the Z-axis direction (vertical direction, perpendicular direction). However, they may be arranged in a direction inclined from the Z-axis direction or in a direction within the XY plane (horizontal direction).

[0119] In the above embodiment, the electrical component 510 and the cover 600 are arranged in the second space S2. However, at least one of the electrical component 510 and the cover 600 may not be arranged. The electrical component 510 and the cover 600 may be arranged in the first space S1.

[0120] In the above-described embodiment, the first conductive member 513 penetrates the partition wall 340 within the range where the cover 600 covers the electrical component 510. However, the present invention is not limited to this. The first conductive member 513 may penetrate the partition wall 340 outside the range where the cover 600 covers the electrical component 510. In this case, the space between the first conductive member 513 and the partition wall 340 is sealed by filling with a caulking material or using a waterproof cable ground, etc. The first conductive member 513 does not necessarily have to penetrate the partition wall 340. In this case, after the first conductive member 513 penetrates the case body 110, it may be connected to the main circuit wiring member, or the first bus bar 41 may be disposed in the first space S1 and the main circuit wiring member may penetrate the case body 110. The lid member 140 may be penetrated by the first conductive member 513 or the main circuit wiring member. In this case, the gasket 133 serves as the gasket of the present invention. That is, in this case, the "second space" may not be provided. Thus, in the above-described embodiment, an aspect in which the "second space" is not provided may also be acceptable.

[0121] In the above-described embodiment, the partition wall 340 is part of the inner case 300. However, the partition wall 340 may be a member different from the inner case 300. In this case, the power storage device 10 does not necessarily have to include the inner case 300.

[0122] In the above-described embodiment, the gasket 900 is disposed between the partition wall 340 and the weight 120 of the outer case 100. However, it may be disposed between the partition wall 340 and the case body 110 of the outer case 100. In this case, the outer case 100 does not necessarily have to include the weight 120.

[0123] In the above-described embodiment, at least a part of the gasket 900 is disposed within the opening 112b when viewed from the opening direction of the opening 112b of the outer case 100. However, the present invention is not limited to this. The opening 112b may be disposed at a position where water can be drained from the outer case 100, and the position is not particularly limited. The same applies to the opening 111b.

[0124] In the above embodiment, the opening 111b is formed in each of the pair of outer case side walls 111 of the outer case 100, and the opening 112b is formed in each of the pair of outer case side walls 112. However, the present invention is not limited to this. The opening 111b may not be formed in one or both of the outer case side walls 111, and the opening 112b may not be formed in one or both of the outer case side walls 112.

[0125] In the above embodiment, the posture (orientation) in which the power storage element unit 200 is arranged is not limited. In the power storage element unit 200, the external terminal 250 may be arranged to protrude in the +Y-axis direction, or may be arranged to protrude in the X-axis direction or the Z-axis direction. The pair of end plates 220 may be arranged to face each other in the X-axis direction, or may be arranged to face each other in the Y-axis direction.

[0126] In the above embodiment, the power storage element unit 200 may include a box body (container) constituting the exterior body instead of, or in addition to, the end plates 220 and the side plates 230.

[0127] In the above embodiment, the power storage device 10 is not limited to having all the above-described configurations, such as not having the through-hole 111a formed in the case main body 110, not having the case lid 150, or not having the elastic member 800.

[0128] The forms constructed by arbitrarily combining the above embodiment and the above modification examples are also included in the scope of the present invention.

Industrial Applicability

[0129] The present invention can be applied to a power storage device including a power storage element such as a secondary battery.

Explanation of Reference Numerals

[0130] 10 Power storage device 20 Power storage unit 30 Power storage unit main body 31 Battery element unit group 40 Bus bar 43 Third bus bar 100 Outer case 100a, 111b, 112b, 241, 343, 344 Opening 112a Opening for connector 110 Case body 120, 121, 122 Weight 120a Upper surface 124, 132 Auxiliary member 123a, 124a Fixing part 130 Intermediate member 900 Gasket 140 Cover member 200 Battery element unit 210 Battery element 220 End plate 230 Side plate 250 External terminal 260 Terminal cover 300 Inner case 310 First wall member 320 Second wall member 330 Third wall member 340 Partition wall 341 Second fixing member 345 Surface 400, 410, 420, 421, 430, 440, 450, 800 Elastic member 500 Connector 510, 511, 512 Electrical component 513 First conductive member 514 Control wiring member 515 First wiring member 516 Second wiring member 600 Cover 610 Wire holding part 700 First fixing member S1 First space S2 Second space

Claims

1. A power storage element unit including a power storage element, a case for housing the power storage element unit, a connector for electrically connecting the power storage element unit and an external wiring, a partition wall for partitioning a space inside the case into a first space and a second space arranged in a predetermined direction, a gasket disposed between a surface of the partition wall facing the first space and the case, and the power storage element unit is disposed in the first space, at least a part of the connector is disposed in the second space A power storage device.

2. An electrical component electrically connected to the power storage element unit and a cover for covering the electrical component are disposed in the second space The power storage device according to claim 1.

3. The power storage device further includes a conductive member penetrating the partition wall within a range where the cover covers the electrical component, The conductive member electrically connects the power storage element unit and the electrical component The power storage device according to claim 2.

4. The case includes a weight, The gasket is disposed between a surface of the partition wall facing the first space and the weight The power storage device according to any one of claims 1 to 3.

5. An inner case disposed inside the case and housing the power storage element unit is provided, The partition wall is a part of the inner case The power storage device according to any one of claims 1 to 3.

6. An opening is formed in the case, At least a part of the gasket is disposed in the opening when viewed from the opening direction of the opening The power storage device according to any one of claims 1 to 3.

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