Power storage device

Abstract

To provide a power storage device with which it is possible to easily fix a power storage unit including power storage elements and a case together.SOLUTION: A power storage device 10 comprises: a power storage unit 20 including power storage elements; a case for accommodating the power storage unit 20; and a first fixing member 700 accommodated in the case, for fixing the power storage unit 20 and the case together. The case includes a side wall and a bottom wall, a penetration part 111a is formed in the side wall and / or the bottom wall, and at least some of the first fixing members 700 is located in the penetration part 111a as seen from the penetration direction of the penetration part.SELECTED DRAWING: Figure 9

Description

Technical Field

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

Background Art

[0002] Patent Document 1 discloses an in-vehicle battery in which a battery module including battery cells is fixed to a fixing bracket, and the fixing bracket is fixed to a battery case.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the in-vehicle battery disclosed in Patent Document 1, although the battery module, the battery case, and the fixing bracket are fixed, depending on the fixing positions of the battery module or the battery case and the fixing bracket, the fixing work may be difficult.

[0005] The present invention has been made by the inventors of the present application newly paying attention to the above problems, and an object thereof is to provide a power storage device capable of easily fixing a power storage unit including a power storage element and a case.

Means for Solving the Problems

[0006] A power storage device according to an aspect of the present invention includes a power storage unit including a power storage element, a case that houses the power storage unit, and a first fixing member that is housed in the case and fixes the power storage unit and the case. The case includes a side wall and a bottom wall, a through-hole is formed in at least one of the side wall and the bottom wall, and at least a part of the first fixing member is disposed in the through-hole as viewed from the through direction of the through-hole.

Advantages of the Invention

[0007] According to the power storage device of the present invention, a power storage unit including a power storage element and a case can be easily fixed.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0009] (1) The power storage device according to one aspect of the present invention includes a power storage unit including a power storage element, a case housing the power storage unit, and a first fixing member housed in the case for fixing the power storage unit and the case. The case includes a side wall and a bottom wall, and a through-hole is formed in at least one of the side wall and the bottom wall. At least a part of the first fixing member is disposed in the through-hole as viewed from the through direction of the through-hole.

[0010] According to this, in the power storage device, a through-hole is formed in at least one of the side wall and the bottom wall of the case, and at least a part of the first fixing member for fixing the power storage unit including the power storage element and the case is disposed in the through-hole as viewed from the through direction of the through-hole. Thereby, since the first fixing member can be accessed from the through-hole, the fixing work when fixing the power storage unit and the case becomes easy. Therefore, the power storage unit including the power storage element and the case can be easily fixed.

[0011] (2) In the power storage device according to the above (1), the through-hole may be formed at a position close to the bottom wall in the side wall.

[0012] According to this, by forming the through-hole at a position close to the bottom wall in the side wall of the case, the power storage unit and the case can be fixed at a position close to the bottom wall in the power storage unit. Thereby, the power storage unit can be stably fixed to the case.

[0013] (3) In the power storage device according to the above (1) or (2), the case may include an opening on the side opposite to the bottom wall, and the power storage device may include a second fixing member for fixing the power storage unit and the case at a position closer to the opening than the bottom wall.

[0014] According to this, by fixing the power storage unit and the case at a position closer to the opening than the bottom wall of the case by the second fixing member, the power storage unit can be more stably fixed to the case.

[0015] (4) In the power storage device according to any one of (1) to (3) above, at least one of the side wall and the bottom wall has a plurality of the through portions formed therein, and the power storage device may include a plurality of the first fixing members corresponding to the plurality of the through portions.

[0016] According to this, a plurality of through portions are formed in the case, and a plurality of first fixing members arranged in the through portions as viewed from the through direction of the through portions are arranged for the plurality of through portions. Thereby, since the power storage unit and the case can be fixed by the plurality of first fixing members, the power storage unit can be fixed to the case more stably.

[0017] (5) In the power storage device according to (4) above, the through portions may be formed in each of two opposing side walls provided in the case, and the power storage device may include the first fixing members corresponding to the respective through portions.

[0018] According to this, by forming two through portions in two opposing side walls of the case and arranging two first fixing members for the two through portions, the power storage unit can be fixed to the case more stably.

[0019] (6) In the power storage device according to any one of (1) to (5) above, the case includes a case body in which the through portion is formed and an intermediate member fixed to the case body, and the first fixing member may be fixed to the intermediate member.

[0020] According to this, the case includes an intermediate member fixed to the case body, and by fixing the first fixing member to the intermediate member, the first fixing member can be fixed to the case body via the intermediate member. Thereby, even when it is difficult to directly fix the first fixing member to the case body, the first fixing member can be easily fixed to the case.

[0021] (7) In the power storage device according to (6) above, the first fixing member may be fixed to a portion of the intermediate member close to the bottom wall.

[0022] According to this, by fixing the first fixing member to a portion of the intermediate member of the case close to the bottom wall, the power storage unit and the case can be fixed at a position close to the bottom wall of the intermediate member. Thereby, the power storage unit can be fixed to the case more stably.

[0023] (8) In the power storage device according to the above (6) or (7), the case may further include a lid member that closes the through portion, and the lid member may be attached to the intermediate member.

[0024] According to this, in the case, by attaching the lid member that closes the through portion of the case body to the intermediate member, the lid member can be attached to the case body by using the intermediate member.

[0025] Hereinafter, with reference to the drawings, a power storage device according to an embodiment (including a modification thereof) of the present invention will be described. Each of the embodiments described below shows a comprehensive or specific example. 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 shown. In each figure, the same or similar components are denoted by the same reference numerals.

[0026] In the following description and drawings, the opposing direction of the short side wall of the outer case of the power storage device, the opposing direction of the short side wall of the inner case, the opposing direction of the short side wall of the outer case and the short side wall of the inner case, or the arrangement direction of the power storage element unit group is defined as the X-axis direction. The opposing direction of the long side wall of the outer case of the power storage device, the penetrating direction of the through portion of the outer case, the opposing direction of the long side wall of the inner case, the opposing direction of the long side wall of the outer case and the long side wall of the inner case, the protruding direction of the external terminal 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 opposing direction of the bottom wall of the outer case and the bottom wall of the inner case, the arrangement direction of the power storage element unit (power storage unit), the electrical component 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.

[0027] In the following description, the X-axis plus direction indicates the arrow direction of the X-axis, and the X-axis minus direction indicates the opposite direction of the X-axis plus direction. When simply referring to the X-axis direction, it indicates both directions of the X-axis plus direction and the X-axis minus direction or either one of the directions. 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 include cases where they are not strictly 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". The material having insulating properties is preferably formed from a material having a volume resistivity of 1×10 10 Ωm or more.

[0028] (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 Z-axis negative direction end portion (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.

[0029] 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, automatic guided vehicle (AGV), automobile, motorcycle, watercraft, ship, 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.

[0030] 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).

[0031] [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 it 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 150 included in the outer case 100 will be described in detail.

[0032] 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 150 is a flat plate-shaped member that constitutes the lid of the outer case 100. The case lid 150 is connected (joined) to the case body 110 and closes the opening 100a of the case body 110. The case lid 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 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 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.

[0033] 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 opposite to the outer case bottom wall 113 of the case body 110. That is, the outer case 100 has an opening 100a on the side opposite to the outer case bottom wall 113.

[0034] The outer case side wall 111 is a wall that faces (is orthogonal to) in 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 that faces (is orthogonal to) in 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 that faces (is orthogonal to) in 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, etc., the case body 110 (outer case side walls 111, 112, 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.

[0035] A through portion, which is an opening (through hole, through aperture) that penetrates the wall, is formed in at least one of the outer case side walls 111, 112, and the outer case bottom wall 113. In the present embodiment, a through portion 111a that penetrates the outer case side wall 111 in the Y-axis direction is formed in the outer case side wall 111. Further, a plurality of through portions 111a are formed in at least one of the outer case side walls 111, 112, and the outer case bottom wall 113. 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.

[0036] 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 through which the connector 500 passes.

[0037] The outer case 100 is further formed with openings 111b and 112b. That is, the openings 111b are formed in each of the pair of outer case side walls 111, and the openings 112b are 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.

[0038] 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.

[0039] As shown in FIG. 4, the weight 120 includes a pair of flat plate-shaped and rectangular weights 121 parallel to the XZ plane on both sides in the Y-axis direction, and a pair of flat plate-shaped 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.

[0040] The weight 121 faces the outer case side wall 111 of the case body 110 and is arranged 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 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 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.

[0041] The connecting member 123 and the auxiliary member 124 are members to which the partition wall 340 of the inner case 300 described later is fixed (see FIG. 7 etc.). 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.

[0042] 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-hole 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 in the Y-axis direction of the outer case 100.

[0043] 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.

[0044] 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.

[0045] 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., which 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.

[0046] The lid member 140 is a member that closes the through-hole 111a of the outer case side wall 111 of the case body 110. The lid member 140 is fixed to the intermediate member 130 and thereby fixed to the outer case side wall 111 to close the through-hole 111a. In the present embodiment, a pair of lid members 140 are arranged on both sides of the outer case 100 in the Y-axis direction, and the through-holes 111a of 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.

[0047] 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 portion 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.

[0048] [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.

[0049] 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 element units 200 arranged in the Z-axis direction (the first direction) and a third bus bar 43 that electrically connects the plurality of power storage element units 200. In the present embodiment, in each power storage element unit group 31, two power storage element units 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 element units 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 element units 200 may be arranged in the Z-axis direction. A plurality of power storage element units 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 element units 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 element units 200 may be connected in series or in parallel. A detailed description of the configuration of the power storage element unit 200 will be given later.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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 of the power storage unit main body 30 in the Y-axis direction. 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.

[0054] The second wall member 320 is a flat plate-shaped and rectangular wall parallel to the YZ plane, which is arranged in the positive 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.

[0055] 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 negative 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.

[0056] 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 negative 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.

[0057] The partition wall 340 is a flat plate-shaped and rectangular wall parallel to the XY plane, which is arranged in the positive 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.

[0058] 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 passes, and a plurality of openings 344 through which a control wiring member 514 described later passes. The main circuit wiring member (second wiring member 516) passes 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.

[0059] 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, passes 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, when 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.

[0060] 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.

[0061] 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 and shape of the power storage unit body 30, etc., 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.

[0062] 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 body 30 and the power storage unit body 30 in three directions of the X-axis direction, Y-axis direction, and Z-axis direction.

[0063] Specifically, an elastic member 410 is disposed between the pair of first wall members 310 and the power storage unit 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 body 30. Further, an elastic member 421 is disposed at a recessed position on the surface of the power storage element unit 200 in the positive 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 body 30. An elastic member 440 is disposed between the bottom wall 332 of the third wall member 330 and the power storage unit body 30. An elastic member 450 is disposed between the partition wall 340 and the power storage unit body 30.

[0064] With this configuration, the pair of first wall members 310 sandwich the power storage unit main body 30 in a state of 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 in a state of 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 in a state of compressing it in the Z-axis direction.

[0065] The connector 500 is a connector that electrically connects the power storage element unit 200 inside the power storage unit main body 30 and the wiring outside the power storage device 10 (for example, the 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 the electronic components (electronic circuits) 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.

[0066] 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 electronic components such as a circuit board, a relay (magnetic contactor), a fuse, and a current sensor (Hall sensor) for monitoring or controlling the state (voltage, temperature, charge / discharge state, etc.) of the power storage element unit 200, and wiring.

[0067] Cover 600 is a cover member that covers the electrical component 510. Cover 600 is disposed on the partition wall 340 so as to cover the electrical component 510 on the partition wall 340. 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 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 cover 600 and partition wall 340 is filled by caulking or welding or the like, and waterproofing 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.

[0068] Cover 600 is a box-shaped member and is provided with a wire holding portion 610 on the side surface in the positive X-axis direction. The wire holding portion 610 is a member that allows a wire to be inserted and held. The side surface of 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), etc. 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 inside 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 common to charging and discharging.

[0069] [1.3 Description of the First Fixing Member 700] Next, the first fixing member 700 will be described in detail.

[0070] 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 portion 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 portion 111a). In the present embodiment, a plurality of first fixing members 700 are disposed corresponding to the plurality of through portions 111a of the outer case 100. Specifically, two first fixing members 700 are disposed corresponding to the two through portions 111a formed in the pair of outer case side walls 111 of the case body 110.

[0071] 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 disposed 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 an L-shaped and plate-shaped member extending in the X-axis direction as viewed from the X-axis direction. The reinforcing portion 720 is a triangular and plate-shaped reinforcing rib as viewed from the X-axis direction.

[0072] 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 disposed on a flat plate portion parallel to the XY plane at the end portion 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 disposed on a flat plate portion parallel to the XZ plane at the end portion 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 disposed at a position adjacent in the X-axis direction to each of the fixing portions 711 and the fixing portions 712 having the same position in the X-axis direction.

[0073] [1.4 Explanation of Elastic Member 800 and Gasket 900] Next, the elastic member 800 and the gasket 900 will be described in detail.

[0074] 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 that can be used for the elastic member 400.

[0075] 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 that can be used for the gasket 133 of the intermediate member 130.

[0076] [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, FIG. 6 shows one energy storage element unit 200, and hereinafter, the configuration of one energy storage element unit 200 will be described in detail.

[0077] 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 a spacer disposed between the energy storage elements 210, a bus bar that connects the terminals 212 of the plurality of energy storage elements 210, and a bus bar frame that positions the bus bar, etc., but illustration and detailed description thereof are omitted.

[0078] 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.

[0079] The power 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 power storage elements 210 are arranged side by side in the Y-axis direction and the Z-axis direction, but the arrangement direction and number of the power storage elements 210 are not particularly limited. In the present embodiment, the power storage element 210 has a rectangular parallelepiped shape (square shape) that is flat in the Z-axis direction, but the shape of the power storage element 210 is not limited to the rectangular parallelepiped shape, and may be a polygonal prism shape, a cylindrical shape, an elliptical cylinder shape, an elliptical cylinder shape, etc. other than the rectangular parallelepiped shape. The power 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 power storage element 210 may be a primary battery instead of a secondary battery. The power storage element 210 may be a battery using a solid electrolyte. The power storage element 210 may be a pouch-type power storage element.

[0080] The power storage element 210 includes a container 211 and terminals 212 that 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 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 a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator.

[0081] A pair of end plates 220 and a pair of side plates 230 are restraint members that sandwich a plurality of power storage elements 210 from both sides in the Z-axis direction, thereby compressing (restraining) each power storage element 210 from both sides in the Z-axis direction. The restraint member is composed of a first restraint member (end plate 220) and a second restraint 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 member is 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 metal members 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.

[0082] A pair of end plates 220 are plate-shaped and rectangular members that are arranged on both sides of a plurality of power storage elements 210 in the Z-axis direction and 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 include a protruding portion 221 that protrudes in the minus Y-axis direction and a protruding portion 222 that protrudes in the plus Y-axis direction. Recesses 221a are formed on both sides of the protruding portion 221 in the X-axis direction, and recesses 222a are formed on both sides of the protruding portion 222 in the X-axis direction. The end face (front end face) of the protruding portion 221 in the minus Y-axis direction has a flat front end face 221c, and the end face (front end face) of the protruding portion 222 in the plus Y-axis direction has a flat front end face 222c. In the present embodiment, both of the pair of end plates 220 include protruding portions 221 and recesses 221a and protruding portions 222 and recesses 222a having the same configuration.

[0083] The protruding portion 221 is a rectangular portion extending in the X-axis direction and protruding 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 and protruding 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.

[0084] 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 restrained. The side plates 230 extend in the Z-axis direction so as to straddle the plurality of power storage elements 210, and apply a restraining 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.

[0085] 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. An opening 241 through which a control wiring member 514 (see FIG. 8) including wiring for monitoring or controlling the state (voltage, temperature, charge and discharge state, etc.) of the power storage element 210 passes is formed at the Z-axis plus direction end portion in the Y-axis plus direction end portion of the exterior member 240. 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 (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, it is suppressed that the fixing portion 243 protrudes from the outer surface (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 (end surface in the X-axis minus direction) of the exterior member 240.

[0086] 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 conductive member made of metal 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 (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.

[0087] The terminal cover 260 is a cover member for the external terminal 250, which 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 insulating coating. The terminal cover 260 thereby protects the external terminal 250 and avoids the external terminal 250 from contacting an external metal member or the like.

[0088] [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 with respect to the power storage unit main body 30 from the power storage device 10.

[0089] 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, the 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 the elastic member 410).

[0090] The pair of first wall members 310, which are two wall members provided in the inner case 300, sandwich the 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 at a distance from the first wall member 310 without contacting the first wall member 310.

[0091] 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 that protrudes 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 protruding portion 221 has a flat tip surface 221c in surface contact with one of the first wall members 310, and the protruding portion 222 has a flat tip surface 222c in surface contact with the other first wall member 310.

[0092] 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 in a size through which the bus bar or wiring or the like can pass.

[0093] 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 making 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 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, by arranging the power storage element unit groups 31 in the direction (X-axis direction) intersecting the direction in which the pair of external terminals 250 are arranged, 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 of 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.

[0094] 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, aluminum alloy, copper, 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.

[0095] 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.

[0096] 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).

[0097] 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, penetrate 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 have a structure that fills the gap with caulking or the like.

[0098] 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 led out 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 led out from the opening 241 formed at the Y-axis positive direction end of the exterior member 240. The control wiring member 514 led out from the opening 241 is connected to the connector 500 through the electronic components (electronic circuits) and wirings provided in the electrical component 510 (such as by the wiring penetrating the cover 600). In the present embodiment, the control wiring member 514 is a cable (wire) including various wirings such as a wiring for monitoring or controlling the state (voltage, temperature, charge / discharge state, etc.) of the power storage element 210, a wiring for controlling the electrical component 510, and a wiring for communication, but may also be a conductive member such as a bus bar.

[0099] 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.

[0100] [Description of the First Fixing Member 700 and the Surrounding Configuration] Next, the first fixing member 700 and the surrounding configuration will be described in detail. FIG. 9 is a perspective view showing the first fixing member 700 and the surrounding configuration according to the present embodiment. FIG. 9 shows a state where the lid member 140 in the minus Y-axis direction is removed from the power storage device 10. FIG. 10 is a cross-sectional view showing the first fixing member 700 and the surrounding configuration according to the present embodiment. FIG. 10 shows a configuration when both ends in the Y-axis direction at the minus Z-axis direction end of the power storage device 10 shown in FIG. 9 are cut by a plane parallel to the YZ plane and viewed from the plus X-axis direction. In FIG. 10, the lid member 140 in the plus Y-axis direction is not removed from the power storage device 10 (it is in an attached state). In the present embodiment, the first fixing member 700 and the surrounding configuration in the plus Y-axis direction and the first fixing member 700 and the surrounding configuration in the minus Y-axis direction have the same configuration.

[0101] As shown in these figures, the through-hole 111a is formed at a position on the outer case side wall 111 close to the outer case bottom wall 113. That is, the through-hole 111a is formed in a part in the minus Z-axis direction (a part in the minus Z-axis direction from the central position of the outer case side wall 111 in the Z-axis direction) when the outer case side wall 111 is bisected in the Z-axis direction. In the present embodiment, the through-hole 111a is formed at the minus Z-axis direction end of the outer case side wall 111. The two through-holes 111a formed in the pair of outer case side walls 111 are both formed at positions close to the outer case bottom wall 113 of the pair of outer case side walls 111. That is, the two through-holes 111a are both formed at the minus Z-axis direction ends of the outer case side wall 111 and are arranged at positions facing each other in the Y-axis direction (positions overlapping when viewed from the Y-axis direction).

[0102] The first fixing member 700 is arranged at a position facing the through-hole 111a (a position where at least a part of the first fixing member 700 is exposed from the through-hole 111a). That is, at least a part of the first fixing member 700 is arranged in the through-hole 111a when viewed from the through direction (Y-axis direction) of the through-hole 111a. It can also be said that at least a part of the first fixing member 700 is arranged at a position visible from the through-hole 111a when the lid member 140 is removed from the power storage device 10. In the present embodiment, the entire first fixing member 700 is arranged in the through-hole 111a when viewed from the through direction (Y-axis direction) of the through-hole 111a. More specifically, since the first fixing member 700 is fixed in the opening of the intermediate member 130, at least a part (the whole in the present embodiment) of the first fixing member 700 is arranged in the opening of the intermediate member 130 when viewed from the Y-axis direction.

[0103] The fixing portion 711 of the first fixing member 700 is fixed to the intermediate member 130 in the Z-axis direction. Specifically, the fixing portion 711 is disposed at the minus Z-axis direction end of the fixing member main body 710 and fixed to the fixing portion 131d at the minus Z-axis direction end of the intermediate member main body 131 of the intermediate member 130. Thereby, the first fixing member 700 is fixed to a portion of the intermediate member 130 close to the outer case bottom wall 113. That is, the fixing portion 131d is formed at a portion in the minus Z-axis direction (a portion in the minus Z-axis direction from the central position of the intermediate member 130 in the Z-axis direction) when the intermediate member 130 is bisected in the Z-axis direction. In the present embodiment, the fixing portion 131d is disposed at the minus Z-axis direction end of the intermediate member main body 131 of the intermediate member 130. For this reason, the first fixing member 700 is fixed to a portion of the intermediate member 130 close to the outer case bottom wall 113 by the fixing portion 711.

[0104] The fixing portion 712 of the first fixing member 700 is fixed to the power storage unit 20 in the Y-axis direction. Specifically, the fixing portion 712 of the first fixing member 700 is fixed to the fixing portion 310a of the first wall member 310 of the inner case 300 included in the power storage unit 20. Thereby, the first fixing member 700 is fixed to a portion of the power storage unit 20 close to the outer case bottom wall 113. That is, the fixing portion 310a is formed at a portion in the minus Z-axis direction (a portion in the minus Z-axis direction from the central position of the power storage unit 20 (first wall member 310) in the Z-axis direction) when the power storage unit 20 (first wall member 310) is bisected in the Z-axis direction. For this reason, the first fixing member 700 is fixed to a portion of the power storage unit 20 (first wall member 310) close to the outer case bottom wall 113 by the fixing portion 712.

[0105] As a result, the first fixing member 700 fixes the power storage unit 20 and the outer case 100 at a position close to the bottom wall 113 of the outer case of the power storage unit 20 (a position close to the bottom wall 113 of the outer case 100, a position closer to the bottom wall 113 than the opening 100a). On the other hand, as described above, 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 bottom wall 113 of the outer case (see FIGS. 3, 7, etc.). That is, the second fixing member 341 is disposed at a portion in the +Z-axis direction when the power storage unit 20 is bisected in the Z-axis direction (a portion in the +Z-axis direction from the central position of the power storage unit 20 in the Z-axis direction). In the present embodiment, the second fixing member 341 is disposed at the +Z-axis direction end of the inner case 300. Therefore, the second fixing member 341 fixes the power storage unit 20 and the outer case 100 at a position close to the opening 100a of the power storage unit 20 (a position far from the bottom wall 113 of the outer case).

[0106] With the first fixing member 700 fixing the power storage unit 20 and the outer case 100 inside the outer case 100, the lid member 140 closes the through hole 111a. Specifically, the lid member 140 has the same size as, or slightly smaller than, the through hole 111a when viewed in the Y-axis direction, and closes the through hole 111a by being disposed inside the through hole 111a. More specifically, the lid member 140 is detachably attached to the intermediate member 130 by fixing the fixing portion 141 of the lid member 140 to the fixing portion 131c of the intermediate member main body 131 of the intermediate member 130.

[0107] In the present embodiment, the lid member 140 is a member cut out from the outer case side wall 111, and the thickness of the lid member 140 in the Y-axis direction is the same as the thickness of the outer case side wall 111 in the Y-axis direction. The outer surface of the auxiliary member 132 of the intermediate member 130 in the Y-axis direction is arranged at the same position in the Y-axis direction as the inner surface of the outer case side wall 111 in the Y-axis direction (the outer surface of the weight 121 in the Y-axis direction). When the lid member 140 is attached to the intermediate member 130, the gasket 133 is compressed by the lid member 140, and the inner surface of the lid member 140 in the Y-axis direction comes into contact with the outer surface of the auxiliary member 132 in the Y-axis direction. Thereby, the lid member 140 is arranged at the same position as the outer case side wall 111 in the Y-axis direction. That is, the lid member 140 is arranged so as not to protrude in the Y-axis direction from the outer case side wall 111.

[0108] In the above, the outer case 100 is an example of a "case", the outer case side wall 111 is an example of a "side wall", and the outer case bottom wall 113 is an example of a "bottom wall".

[0109] [Description of Effects] As described above, according to the power storage device 10 according to the embodiment of the present invention, a through-hole 111a is formed in at least one of the outer case side walls 111 and 112 and the outer case bottom wall 113 of the outer case 100 (in this embodiment, the outer case side wall 111). At least a part of the first fixing member 700 that fixes the power storage unit 20 including the power storage element 210 and the outer case 100 is arranged in the through-hole 111a when viewed from the through direction of the through-hole 111a. Thereby, since the first fixing member 700 can be accessed from the through-hole 111a, the fixing work when fixing the power storage unit 20 and the outer case 100 becomes easy. Therefore, the power storage unit 20 including the power storage element 210 and the outer case 100 can be easily fixed.

[0110] A through-hole 111a is formed at a position on the outer case side wall 111 of the outer case 100 close to the outer case bottom wall 113, so that the power storage unit 20 and the outer case 100 can be fixed at a position (lower position) close to the outer case bottom wall 113 of the power storage unit 20. Thereby, the power storage unit 20 can be stably fixed to the outer case 100. The slip of the power storage unit 20 on the outer case bottom wall 113 of the outer case 100 is suppressed, and the rigidity of the outer case 100 is increased, so that the vibration resistance of the power storage device 10 can be improved.

[0111] By fixing 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 of the outer case 100 by the second fixing member 341, the power storage unit 20 can be more stably fixed to the outer case 100. By fixing the power storage unit 20 and the outer case 100 at a position close to the opening 100a, the fixing operation by the second fixing member 341 becomes easy, and the workability can be improved.

[0112] A plurality of through-holes 111a are formed in the outer case 100, and a plurality of first fixing members 700 arranged in the through-holes 111a are arranged with respect to the plurality of through-holes 111a as viewed from the through direction of the through-holes 111a. Thereby, since the power storage unit 20 and the outer case 100 can be fixed by the plurality of first fixing members 700, the power storage unit 20 can be more stably fixed to the outer case 100.

[0113] By forming two through-holes 111a in two opposing outer case side walls 111 of the outer case 100 and arranging two first fixing members 700 with respect to the two through-holes 111a, the power storage unit 20 can be more stably fixed to the outer case 100.

[0114] The outer case 100 includes an intermediate member 130 fixed to the case body 110. By fixing the first fixing member 700 to the intermediate member 130, the first fixing member 700 can be fixed to the case body 110 via the intermediate member 130. Thereby, even when it is difficult to directly fix the first fixing member 700 to the case body 110, the first fixing member 700 can be easily fixed to the outer case 100. Specifically, by providing the intermediate member 130 for fixing the first fixing member 700 to the outer case 100, the intermediate member 130 can be manufactured according to the first fixing member 700. Thus, the processing of the outer case 100 is easy and waste of the material of the outer case 100 can be suppressed. That is, since it is only necessary to form a connection portion (such as a screw hole, the fixing portion 131d in the present embodiment) with the first fixing member 700 in the intermediate member 130, the processing of the outer case 100 is easy. If the outer case 100 is processed according to the first fixing member 700, there is a possibility of waste of the material. However, by providing the intermediate member 130 in the outer case 100, waste of the material of the outer case 100 can be suppressed.

[0115] By fixing the first fixing member 700 to a portion of the intermediate member 130 of the outer case 100 close to the outer case bottom wall 113, the power storage unit 20 and the outer case 100 can be fixed at a position (lower position) close to the outer case bottom wall 113 of the intermediate member 130. Thereby, the power storage unit 20 can be fixed to the outer case 100 more stably. Slippage of the power storage unit 20 at the outer case bottom wall 113 of the outer case 100 is further suppressed, and the vibration resistance of the power storage device 10 can be further improved.

[0116] In the outer case 100, by attaching the lid member 140 that closes the through-hole 111a of the case body 110 to the intermediate member 130, the lid member 140 can be attached to the case body 110 using the intermediate member 130. That is, even when it is difficult to directly fix the lid member 140 to the case body 110, the lid member 140 can be easily fixed to the case body 110. Specifically, by providing the intermediate member 130 for fixing the lid member 140 to the case body 110, the intermediate member 130 can be manufactured according to the lid member 140, so that the processing of the case body 110 is easy and waste of the material of the case body 110 can be suppressed. That is, since it is only necessary to form a connection portion (such as a screw hole, the fixing portion 131c in the present embodiment) with the lid member 140 in the intermediate member 130, the processing of the case body 110 is easy. If the case body 110 is processed according to the lid member 140, there is a possibility of waste of the material, but by providing the intermediate member 130, waste of the material of the case body 110 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, but 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, one through-hole 111a is formed in each of the pair of outer case side walls 111 of the outer case 100, but the present invention is not limited to this. A plurality of through-holes 111a may be formed in one outer case side wall 111. The through-hole 111a may be formed only in one of the pair of outer case side walls 111. Instead of the through-hole 111a in the outer case side wall 111, or in addition to the through-hole 111a in the outer case side wall 111, a through-hole may be formed in the outer case side wall 112, or a through-hole may be formed in the outer case bottom wall 113. That is, it is only necessary that a through-hole is formed in at least one of the outer case side walls 111, 112 and the outer case bottom wall 113 of the outer case 100.

[0119] In the above embodiment, the first fixing member 700 is arranged for all the through portions 111a, but a configuration in which the first fixing member 700 is not arranged for any of the through portions 111a may also be adopted.

[0120] In the above embodiment, the entire first fixing member 700 is arranged within the through portion 111a as viewed from the through direction of the through portion 111a, but only a part of the first fixing member 700 may be arranged within the through portion 111a.

[0121] In the above embodiment, the through portion 111a is formed at a position close to the outer case bottom wall 113 of the outer case side wall 111, but it may be formed at the central portion of the outer case side wall 111 in the Z-axis direction or at a position close to the opening 100a of the outer case side wall 111.

[0122] In the above embodiment, 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, but it is not limited thereto. The second fixing member 341 may fix the power storage unit 20 and the outer case 100 at a position closer to the outer case bottom wall 113 than the opening 100a or at an intermediate position between the opening 100a and the outer case bottom wall 113.

[0123] In the above embodiment, the first fixing member 700 is fixed to a portion of the intermediate member 130 close to the outer case bottom wall 113, but it is not limited thereto. The first fixing member 700 may be fixed to the central portion of the intermediate member 130 in the Z-axis direction or to a portion of the intermediate member 130 far from the outer case bottom wall 113 (a portion close to the opening 100a).

[0124] In the above embodiment, the shape of the intermediate member 130 is not particularly limited. The intermediate member 130 only needs to include a rod-shaped portion extending in the X-axis direction where the fixing portion 131d is arranged, and may not include the column portion 131b or other portions.

[0125] In the above embodiment, the first fixing member 700 is attached to the intermediate member 130 fixed to the case body 110, but it may be directly attached to the case body 110.

[0126] In the above embodiment, the lid member 140 is attached to the intermediate member 130 fixed to the case body 110, but it may be directly attached to the case body 110. The outer case 100 may not include the lid member 140.

[0127] In the above embodiment, the partition wall 340 is a wall that partitions the space inside the outer case 100, but it may not have the function of partitioning the space inside the outer case 100. In the above embodiment, the partition wall 340 is part of the inner case 300, but the partition wall 340 may be a member different from the inner case 300. That is, the first fixing member 700 and the second fixing member 341 may fix a part other than the inner case 300 of the power storage unit 20 and the outer case 100. In this case, the power storage device 10 may not include the inner case 300.

[0128] 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 protrude in the +Y-axis direction, or may 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.

[0129] In the above embodiment, the power storage element unit 200 may include a box body (container) that constitutes the exterior body instead of, or in addition to, the end plates 220 and the side plates 230.

[0130] In the above embodiment, the power storage device 10 is not limited to having all the above-described configurations, such as not having to include the elastic member 800.

[0131] Modes constructed by arbitrarily combining the above-described embodiments and the above-described modification examples are also included within the scope of the present invention.

Industrial Applicability

[0132] The present invention can be applied to a power storage device including a power storage element such as a secondary battery.

Explanation of Signs

[0133] 10 Power storage device 20 Power storage unit 30 Power storage unit main body 31 Power storage element unit group 40 Bus bar 43 Third bus bar 100 Outer case 100a, 111b, 112b, 241, 343, 344 Opening 110 Case main body 111, 112 Outer case side wall 111a Through-hole 113 Outer case bottom wall 120, 121, 122 Weight 124, 132 Auxiliary member 131c, 131d, 132c, 141, 711, 712 Fixing part 130 Intermediate member 131 Intermediate member main body 131a, 132a Frame body 131b, 132b Column part 133, 900 Gasket 140 Cover member 200 Power storage element unit 210 Power storage 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 400, 410, 420, 421, 430, 440, 450, 800 Elastic member 500 Connector 510, 511, 512 Electrical component 600 Cover 700 First fixing member 710 Fixing member body 720 Reinforcing portion

Claims

1. A power storage unit including a power storage element, a case for housing the power storage unit, and a first fixing member housed in the case for fixing the power storage unit and the case. The case includes a side wall and a bottom wall. At least one of the side wall and the bottom wall is formed with a through hole. At least a part of the first fixing member is disposed in the through hole as viewed from the through direction of the through hole. A power storage device.

2. The through hole is formed at a position of the side wall close to the bottom wall. The power storage device according to Claim 1.

3. The case has an opening on a side opposite to the bottom wall. The power storage device includes a second fixing member for fixing the power storage unit and the case at a position closer to the opening than the bottom wall. The power storage device according to Claim 1 or 2.

4. A plurality of the through holes are formed in at least one of the side wall and the bottom wall. The power storage device includes a plurality of the first fixing members corresponding to the plurality of the through holes. The power storage device according to Claim 1 or 2.

5. The through holes are formed in each of two opposing side walls of the case. The power storage device includes the first fixing member corresponding to each of the through holes. The power storage device according to Claim 4.

6. The case includes a case body in which the through hole is formed and an intermediate member fixed to the case body. The first fixing member is fixed to the intermediate member. The power storage device according to Claim 1 or 2.

7. The first fixing member is fixed to a part of the intermediate member close to the bottom wall. The power storage device according to Claim 6.

8. The case further includes a lid member for closing the through hole. The lid member is attached to the intermediate member. The power storage device according to Claim 6.

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