Electricity storage device

Abstract

A power storage device (10) is provided with a power storage element unit (210) having a power storage element (211) and an external terminal (215), the external terminal (215) being disposed at an end of the power storage element unit (210) in a first direction, and the power storage element unit (210) further having a side member (212) disposed in a second direction intersecting the first direction of the power storage element (211). The side member has a protruding portion (212a) protruding in the first direction than the external terminal (215).

Description

Technical Field

[0001] The present invention relates to an electric storage device including an electric storage element unit having an electric storage element. Background Art

[0002] Conventionally, there is known a power storage device including a power storage element unit having a power storage element and an external terminal. Patent Document 1 discloses a battery pack (power storage element unit, power storage device) including a secondary battery (power storage element) and a high voltage terminal (external terminal).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-133861 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the above-mentioned conventional power storage device, it may be impossible to improve the vibration resistance or impact resistance. That is, in the above-mentioned conventional power storage device, since there is no component for protecting the external terminal, the external terminal or the wiring connected to the external terminal may come into contact with other components and be damaged due to vibration or impact from the outside.

[0008] The present invention was made by the inventors of the present application with new attention paid to the above-mentioned problems, and an object of the present invention is to provide a power storage device capable of easily improving vibration resistance or impact resistance.

[0009] Solutions to Solve Problems

[0010] A power storage device according to one embodiment of the present invention comprises a power storage element unit having a power storage element and an external terminal, wherein the external terminal is arranged at an end of the power storage element unit in a first direction, and the power storage element unit also has a side member arranged in a second direction of the power storage element intersecting the first direction, and the side member has a protrusion that protrudes in the first direction more than the external terminal.

[0011] Effects of the Invention

[0012] According to the power storage device of the present invention, vibration resistance or impact resistance can be easily improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a perspective view showing the structure of the power storage device according to the embodiment.

[0014] Figure 2 It is a perspective view showing the internal structure of an outer casing of the power storage device according to the embodiment.

[0015] Figure 3 It is an exploded perspective view showing each component when the power storage unit included in the power storage device according to the embodiment is exploded.

[0016] Figure 4 It is a perspective view showing the structure of the electric storage element unit according to the embodiment.

[0017] Figure 5 It is a plan view showing the positional relationship between the electric storage device unit and the inner case according to the embodiment.

[0018] Figure 6 It is a front view showing the positional relationship between the electric storage device unit and the inner case according to the embodiment. DETAILED DESCRIPTION

[0019] (1) An electric storage device according to one aspect of the present invention includes an electric storage element unit having an electric storage element and an external terminal, the external terminal being arranged at an end of the electric storage element unit in a first direction, the electric storage element unit further including a side member arranged in a second direction intersecting the first direction of the electric storage element, the side member having a protrusion that protrudes in the first direction relative to the external terminal.

[0020] Thus, in the power storage device, the side member of the power storage element unit has a protruding portion protruding from the external terminal, so that the external terminal and the wiring connected to the external terminal can be prevented from contacting with other members and being damaged due to vibration or impact from the outside. Thus, the external terminal and the wiring can be protected by a simple structure, so that the vibration resistance or impact resistance of the power storage device can be easily improved.

[0021] (2) In the power storage device described in (1) above, the power storage element unit may further include a cover member covering the external terminal, and the protrusion may protrude in the first direction beyond the cover member.

[0022] Thus, the protruding portion of the side member protrudes further than the cover member covering the external terminal, and can protect the external terminal together with the cover member.

[0023] (3) In the power storage device described in (1) or (2) above, the side member may have a recessed portion, the recessed portion being arranged in the first direction of the protruding portion, or the recessed portion being arranged in a third direction of the protruding portion that intersects the first direction and the second direction.

[0024] Thus, the side member has the recessed portion in the first direction or the third direction of the protruding portion, and wiring and the like connected to the external terminal can be arranged in the recessed portion.

[0025] (4) In the power storage device described in (3) above, the recess may be arranged in the second direction of the external terminal.

[0026] Thus, the recessed portion of the side member is arranged on the side (in the second direction) of the external terminal, and thus wiring and the like connected to the external terminal can be easily arranged in the recessed portion.

[0027] (5) For the power storage device described in (3) or (4) above, the power storage device may include a plurality of the power storage element units, the plurality of the power storage element units include a first power storage element unit and a second power storage element unit arranged in the second direction, and the recessed portion of the side member of the first power storage element unit and the recessed portion of the side member of the second power storage element unit are arranged adjacent to each other in the second direction.

[0028] Thus, the plurality of energy storage element units include a first energy storage element unit and a second energy storage element unit, and the recessed portion of the side member of the first energy storage element unit and the recessed portion of the side member of the second energy storage element unit are arranged at adjacent positions, so that wiring connecting the external terminals of the two energy storage element units can be arranged through the two recessed portions.

[0029] (6) In the power storage device described in any one of (1) to (5) above, the power storage device may further include a wall portion disposed in the first direction of the protruding portion.

[0030] Thus, the wall portion is arranged in the first direction of the protruding portion of the side member. Even when an impact is applied from the outside in the first direction, the external terminal and the like can be protected by the contact between the wall portion and the protruding portion.

[0031] Hereinafter, the power storage device involved in the embodiments of the present invention (including its modified examples) will be described with reference to the drawings. The embodiments described below all represent general or specific examples. The numerical values, shapes, materials, components, configuration positions and connection methods of components, manufacturing processes, and the order of manufacturing processes shown in the following embodiments are examples and are not intended to limit the present invention. In each figure, dimensions, etc. are not strictly illustrated. In each figure, the same or identical components are marked with the same figure marks.

[0032] In the following description and drawings, the opposing direction of a pair of short side walls of the case (inner case) of the storage device, the arrangement direction of a pair of external terminals of the storage element unit, the opposing direction of a pair of side members of the storage element unit, the opposing direction of the long side of the storage element and the side member of the storage element unit, the arrangement direction of the external terminal of the storage element unit and the side member, or the opposing direction of a pair of long side faces of the storage element is defined as the X-axis direction. The opposing direction of a pair of long side walls of the case (inner case) of the storage device, the protruding direction of the external terminal of the storage element unit, the opposing direction of the short side of the storage element, or the arrangement direction of a pair of electrode terminals of the storage element is defined as the Y-axis direction. The opposing direction of the upper wall and the bottom wall of the case (inner case) of the storage device, the arrangement direction of the main body and the cover of the container of the storage element, the protruding direction of the electrode terminal of the storage element, or the up and down direction is defined as the Z-axis direction. The above-mentioned X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect each other (orthogonal in this embodiment).

[0033] In the following description, the so-called positive direction of the X-axis indicates the direction of the arrow of the X-axis, and the so-called negative direction of the X-axis indicates the direction opposite to the positive direction of the X-axis. When it is only referred to as the X-axis direction, it means the two directions or any one direction of the positive direction of the X-axis and the negative direction of the X-axis. The same is true for the Y-axis direction and the Z-axis direction. In the following, the Y-axis direction is sometimes referred to as the first direction, the X-axis direction is referred to as the second direction, and the Z-axis direction is referred to as the third direction. The X-axis direction is sometimes described as the left and right direction. Expressions such as parallel and orthogonal that indicate relative directions or postures also include situations where the directions or postures are not strictly speaking. The so-called parallelism of two directions not only means that the two directions are completely parallel, but also means that they are substantially parallel, that is, including a difference of about a few percent. In the following description, when expressed as "insulation", it means "electrical insulation".

[0034] (Implementation Method)

[0035] [1 Overall Description of Power Storage Device 10]

[0036] First, the overall description of the power storage device 10 in the present embodiment will be given. Figure 1 is a perspective view showing the structure of the power storage device 10 according to the present embodiment. Figure 1 , a state in which the outer case cover 120 is removed from the outer case main body 110 of the outer case 100 included in the power storage device 10 is shown. Figure 2 1 is a perspective view showing the internal structure of the outer case 100 of the power storage device 10 according to the present embodiment. Figure 2 , a state is shown in which the power storage cell 20 inside the outer case 100 provided in the power storage device 10 is taken out from the outer case main body 110 . Figure 3It is an exploded perspective view showing each component when the power storage unit 20 included in the power storage device 10 according to the present embodiment is exploded.

[0037] The power storage device 10 is a device that can charge electricity from the outside and discharge electricity to the outside. In the present embodiment, it has a rectangular parallelepiped shape. The power storage device 10 is used for power storage purposes or power supply purposes. The power storage device 10 is used as a battery for driving or starting the engine of a mobile body such as a car, a motorcycle, a forklift, a jet ski, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. As the above-mentioned car, an electric car (EV), a hybrid electric car (HEV), a plug-in hybrid electric car (PHEV) and a fossil fuel (gasoline, light oil, liquefied natural gas, etc.) car are exemplified. As the above-mentioned railway vehicle for the electric railway, a tram, a monorail, a linear motorcar, and a hybrid electric car with both a diesel engine and an electric motor are exemplified. The power storage device 10 can also be used as a battery for fixed installation for home or business use.

[0038] like Figure 1~Figure 3 As shown, the power storage device 10 includes an outer case 100, a power storage cell 20, and a weight 400. The power storage cell 20 includes a power storage cell group 200 composed of a plurality of power storage element cells 210 and an inner case 300. In addition to the above-mentioned structure, the power storage device 10 also includes a positive terminal and a negative terminal of the power storage device 10, a conductive member (wiring, bus bar, etc.) connecting the power storage element cells 210 to each other or the power storage element cells 210 to the main terminal, and a circuit substrate for monitoring or controlling the state (voltage, temperature, charge and discharge state, etc.) of the power storage element cells 210, a relay, a fuse, a shunt resistor, a connector, and other electrical components, but the drawings and detailed descriptions are omitted.

[0039] The outer shell 100 is a rectangular parallelepiped (box-shaped) container (outer box) constituting the outer shell (external body, shell, outer shell) of the power storage device 10. The outer shell 100 is arranged on the outer side of the power storage unit 20 (power storage element unit group 200, inner shell 300) and the counterweight 400, etc., and accommodates them in a predetermined position to protect them from impact, etc. The outer shell 100 is a metal shell formed of a metal member such as aluminum, aluminum alloy, stainless steel, iron, plated steel plate, etc. The outer shell 100 can also be formed of an insulating member such as any resin material that can be used for the cover member 216 of the power storage element unit 210 described later.

[0040] like Figure 1As shown, the outer shell 100 includes an outer shell body 110 constituting the main body of the outer shell 100 and an outer shell cover 120 constituting the cover of the outer shell 100. The outer shell body 110 is a bottomed rectangular cylindrical shell opened in the positive direction of the Z axis, and accommodates the storage cell 20 (storage element cell group 200, inner shell 300) and the weight 400, etc., and fixes them at a predetermined position.

[0041] Specifically, if Figure 2 As shown, a rectangular opening 110a is formed on the outer shell body 110 in the positive direction of the Z axis. The outer shell body 110 has a flat and rectangular outer shell bottom wall 111 arranged in the negative direction of the Z axis. The outer shell body 110 has a pair of outer shell side walls 112 as flat and rectangular short side walls on both sides of the X axis direction, and a pair of outer shell side walls 113 as flat and rectangular long side walls on both sides of the Y axis direction. The outer shell side wall 112 is a wall facing the X axis direction (orthogonal to the X axis direction), and is arranged at the end of the outer shell body 110 in the X axis direction. The outer shell side wall 113 is a wall facing the Y axis direction (orthogonal to the Y axis direction), and is arranged at the end of the outer shell body 110 in the Y axis direction.

[0042] The outer shell cover 120 is a plate-shaped and rectangular cover that blocks the opening 110a of the outer shell body 110. The outer shell body 110 and the outer shell cover 120 are joined by screw fastening based on bolts, etc. As a result, the outer shell 100 becomes a structure in which the interior is sealed. The outer shell body 110 and the outer shell cover 120 can also be joined by welding or bonding, etc. The outer shell body 110 and the outer shell cover 120 can be formed by components of the same material or by components of different materials. According to the structure (quantity, size, shape, etc.) of the contents of the outer shell 100, the outer shell body 110 (the outer shell bottom wall 111, the outer shell side walls 112, 113) and the outer shell cover 120 can be any shape. In this case, the outer shell side wall 112 can also be a long side wall, and the outer shell side wall 113 can be a short side wall.

[0043] like Figure 3As shown, the storage element unit group 200 has a plurality of storage element units 210. In the present embodiment, the storage element unit group 200 is composed of six storage element units 210 arranged in two layers along the Z-axis direction, three storage element units 210 arranged along the X-axis direction. The number of storage element units 210 in the storage element unit group 200 is not particularly limited, and several storage element units 210 may be arranged along the Z-axis direction, several storage element units 210 may be arranged along the X-axis direction, and multiple storage element units 210 may also be arranged along the Y-axis direction. The storage element unit group 200 may also have only one storage element unit 210. In the present embodiment, all the storage element units 210 are connected in series, but any storage element unit 210 may be connected in parallel. A detailed description of the structure of the storage element unit 210 will be described later.

[0044] The inner housing 300 is a housing for housing the electric storage element unit 210. The inner housing 300 is a container (inner box) of a substantially rectangular parallelepiped shape (box shape) constituting the housing (frame) inside the electric storage device 10. The inner housing 300 is arranged outside the electric storage element unit group 200, and houses and holds the electric storage element unit group 200 (electric storage element unit 210) to protect it from impact, etc. The inner housing 300 is a metal housing formed of a member made of metal such as aluminum, aluminum alloy, stainless steel, iron, plated steel plate, etc. In the present embodiment, the inner housing 300 may be formed of a member of the same material as the outer housing 100, or may be formed of a member of a different material from the outer housing 100. The inner housing 300 may also be formed of an insulating member such as any resin material that can be used for the cover member 216 of the electric storage element unit 210 described later. In the present embodiment, the inner housing 300 is a housing for housing the electric storage element unit 210, and the outer housing 100 is a housing for housing the inner housing 300.

[0045] like Figure 2 as well as Figure 3 As shown, the inner housing 300 has an inner housing upper wall 310 constituting the upper wall of the inner housing 300, an inner housing bottom wall 320 constituting the bottom wall of the inner housing 300, and inner housing side walls 330 to 360 constituting the four side walls of the inner housing 300. In this embodiment, the inner housing upper wall 310, the inner housing bottom wall 320, and the inner housing side walls 330 to 360 are all separately constituted. In other words, the inner housing 300 has six walls that are separately constituted.

[0046] The inner housing upper wall 310 is a flat and rectangular upper wall arranged in the positive direction of the Z axis of the storage element unit group 200 and parallel to the XY plane (toward the Z axis direction (orthogonal to the Z axis direction)). The inner housing upper wall 310 is arranged between the storage element unit group 200 and the outer housing cover 120 in the Z axis direction. The inner housing upper wall 310 is joined to the positive end of the inner housing side walls 330, 340 and 360 in the Z axis direction by threaded fastening based on bolts, etc. In the present embodiment, the inner housing upper wall 310 is arranged in the positive direction of the Z axis of the inner housing side walls 330, 340 and 360, and is joined to the positive end of the inner housing side walls 330, 340 and 360 in the Z axis direction. The inner housing upper wall 310 may also be provided with electrical components such as a circuit substrate, a relay, a fuse, a shunt resistor and a connector that monitor or control the state (voltage, temperature, charge and discharge state, etc.) of the storage element unit 210.

[0047] The inner housing bottom wall 320 is a flat and rectangular bottom wall arranged in the negative Z-axis direction of the storage element unit group 200 and parallel to the XY plane (toward the Z-axis direction (orthogonal to the Z-axis direction)). The inner housing bottom wall 320 is arranged between the storage element unit group 200 and the outer housing bottom wall 111 in the Z-axis direction. The inner housing bottom wall 320 is joined to the negative Z-axis end of the inner housing side walls 330 to 360 by threaded fastening based on bolts, etc. In the present embodiment, the inner housing bottom wall 320 is arranged between the inner housing side walls 330 and 340 in the X-axis direction, and is joined to the negative Z-axis end of the inner housing side walls 330 and 340 in the X-axis direction. The inner housing bottom wall 320 is arranged between the inner housing side walls 350 and 360 in the Y-axis direction, and is joined to the negative Z-axis end of the inner housing side walls 350 and 360 in the Y-axis direction.

[0048] The inner housing bottom wall 320 may also be joined to (fixed to) the outer housing bottom wall 111 by bonding, welding, welding, bolting, or riveting using an adhesive or double-sided tape, etc. A plate-like member such as a rubber plate or resin member for absorbing tolerance or suppressing vibration (anti-slip) or other members such as a counterweight may be disposed between the inner housing bottom wall 320 and the outer housing bottom wall 111.

[0049] The inner housing side walls 330 and 340 are short side walls of a flat plate shape and a rectangular shape, which are parallel to the YZ plane (toward the X-axis direction (orthogonal to the X-axis direction)) and are arranged on both sides of the storage element unit group 200 in the X-axis direction. The inner housing side wall 330 is arranged in the positive direction of the X-axis of the storage element unit group 200, and the inner housing side wall 340 is arranged in the negative direction of the X-axis of the storage element unit group 200. The inner housing side walls 330 and 340 are arranged between the storage element unit group 200 and the outer housing side wall 112 (between the storage element unit group 200 and the counterweight 400) in the X-axis direction. The inner housing side walls 330 and 340 are joined to the X-axis direction ends of the inner housing upper wall 310, the inner housing bottom wall 320, and the inner housing side walls 350 and 360 by screw fastening based on bolts or the like. In this embodiment, the inner casing side walls 330 and 340 are arranged outside the inner casing bottom wall 320 and the inner casing side wall 360 in the X-axis direction, and are joined to both ends of the inner casing bottom wall 320 and the inner casing side wall 360 in the X-axis direction.

[0050] The inner housing side walls 350 and 360 are long flat rectangular side walls arranged on both sides in the Y-axis direction of the storage element unit group 200 and parallel to the XZ plane (toward the Y-axis direction (orthogonal to the Y-axis direction)). The inner housing side wall 350 is arranged in the negative direction of the Y-axis of the storage element unit group 200, and the inner housing side wall 360 is arranged in the positive direction of the Y-axis of the storage element unit group 200. The inner housing side walls 350 and 360 are arranged between the storage element unit group 200 and the outer housing side wall 113 in the Y-axis direction. The inner housing side wall 350 is joined to the negative end of the Y-axis of the inner housing bottom wall 320 and the inner housing side walls 330 and 340 by screw fastening with bolts or the like. In the present embodiment, the inner housing side wall 350 is arranged in the negative direction of the Y axis of the inner housing bottom wall 320, the inner housing side walls 330 and 340, and is joined to the negative end of the Y axis in the Y axis direction of the inner housing bottom wall 320, the inner housing side walls 330 and 340. The inner housing side wall 360 is joined to the positive end of the Y axis in the inner housing upper wall 310, the inner housing bottom wall 320, the inner housing side walls 330 and 340 by screw fastening with bolts or the like. In the present embodiment, the inner housing side wall 360 is arranged in the positive direction of the Y axis of the inner housing bottom wall 320, and is joined to the positive end of the Y axis in the Y axis direction of the inner housing bottom wall 320.

[0051] The inner case 300 restricts the movement of the storage element unit group 200 by causing at least one of the inner case upper wall 310, the inner case bottom wall 320, and the inner case side walls 330 to 360 to come into contact with the storage element unit group 200. In the present embodiment, all of the inner case upper wall 310, the inner case bottom wall 320, and the inner case side walls 330 to 360 come into contact with the storage element unit group 200. At least one of the inner case upper wall 310, the inner case bottom wall 320, and the inner case side walls 330 to 360 has a plate-like member such as a rubber plate or a resin member for tolerance absorption or vibration suppression (anti-slip) on the inner surface, and comes into contact with the storage element unit group 200 through the plate-like member.

[0052] The walls of the inner shell upper wall 310, the inner shell bottom wall 320, and the inner shell side walls 330~360 can also be joined to each other by welding or bonding. For the inner shell upper wall 310, the inner shell bottom wall 320, and the inner shell side walls 330~360, all walls can be formed by components of the same material, or any wall can be formed by components of different materials. Depending on the size and shape of the storage element unit group 200, the inner shell upper wall 310, the inner shell bottom wall 320, and the inner shell side walls 330~360 can be walls of any shape. In this case, the inner shell side walls 330 and 340 can also be long side walls, and the inner shell side walls 350 and 360 can be short side walls.

[0053] The counterweight 400 is a weight disposed inside the outer shell 100 and outside the inner shell 300. The counterweight 400 is a counterweight (balance weight) for adjusting the weight of the power storage device 10. In the present embodiment, the counterweight 400 has a rectangular parallelepiped shape that is flat in the X-axis direction. The counterweight 400 is disposed in a state of being opposed to the outer shell side wall 112 of the outer shell body 110 of the outer shell 100 and in contact with the outer shell side wall 112. In the present embodiment, the counterweight 400 is joined to (fixed to) the outer shell side wall 112 by welding (spot welding, etc.). The counterweight 400 may also be joined to (fixed to) the outer shell side wall 112 by bonding, welding, bolting, or riveting based on an adhesive or double-sided tape. In the present embodiment, two weights 400 (see FIG. 1 ) are arranged on both sides of the power storage unit 20 (power storage element unit group 200 , inner case 300 ) in the X-axis direction. Figure 6 Specifically, two counterweights 400 are disposed between the inner housing side wall 330 and the outer housing side wall 112 in the positive direction of the X-axis and between the inner housing side wall 340 and the outer housing side wall 112 in the negative direction of the X-axis.

[0054] The weight of the counterweight 400 is appropriately determined according to the weight required to adjust the weight of the power storage device 10. In the present embodiment, the weight of one counterweight 400 is about 50 to 60 kg. The total weight of all (two in the present embodiment) counterweights 400 provided by the power storage device 10 is preferably 1 / 5 or more of the total weight of the power storage device 10, more preferably 1 / 4 or more, and further preferably 1 / 3 or more. The material of the counterweight 400 is not particularly limited, and can be formed of any metal member that can be used for the outer shell 100 and the inner shell 300, such as aluminum, aluminum alloy, stainless steel, and iron. In the present embodiment, the two counterweights 400 are formed of a member of the same material as the outer shell 100 and the inner shell 300, but can also be formed of a member of a material different from the outer shell 100 and the inner shell 300, and the two counterweights 400 can also be formed of members of different materials from each other.

[0055] [2 Description of the power storage element unit 210]

[0056] Next, the structure of the power storage element unit 210 will be described in detail. Figure 4 2 is a perspective view showing the structure of the power storage element unit 210 according to the present embodiment. Figure 4 In Figure 3 One of the storage element cells 210 shown in FIG. 1 is enlarged, and the storage element 211 and the external terminal 215 located inside are shown by dotted lines. All of the plurality of storage element cells 210 provided in the storage device 10 (storage cell 20, storage element cell group 200) have the same structure. Figure 4 , one power storage element unit 210 is shown, and the structure of one power storage element unit 210 will be described in detail below.

[0057] The power storage element unit 210 is a substantially rectangular parallelepiped battery module (battery pack) that can charge electricity from the outside and discharge electricity to the outside. Figure 4 As shown, the storage element unit 210 includes a plurality of storage elements 211, a pair of end plates 212, a pair of side plates 213, an outer casing 214, a pair of (positive and negative) external terminals 215, and a pair of (positive and negative) cover members 216. In addition to the above-mentioned structure, the storage element unit 210 further includes a spacer disposed between the storage elements 211, a bus bar connecting the electrode terminals 211b of the plurality of storage elements 211 to each other, and a bus bar frame for positioning the bus bar, etc., but illustration and detailed description are omitted.

[0058] The storage element 211 is a secondary battery (single cell) that can charge and discharge electricity, more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. In the present embodiment, a plurality of storage elements 211 are arranged along the X-axis direction and the Y-axis direction, but the arrangement direction and number of the storage elements 211 are not particularly limited, and it can also be configured to have only one storage element 211. In the present embodiment, when the storage element 211 is arranged in such a way that the direction in which a pair of electrode terminals 211b are arranged becomes the Y-axis direction, the storage element 211 is in a rectangular parallelepiped shape (square) flat in the X-axis direction, and has a long side and a short side. In the storage element 211, the X-axis direction becomes the thickness direction of the storage element 211. The shape of the storage element 211 is not limited to a rectangular parallelepiped shape, and may also be a polygonal prism shape, a cylindrical shape, a long cylindrical shape, an elliptical cylindrical shape, etc. other than a rectangular parallelepiped shape. The storage element 211 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 211 may not be a secondary battery but a primary battery that allows the user to use the stored electricity even if the user does not charge the battery. The power storage element 211 may be a battery using a solid electrolyte. The power storage element 211 may be a pouch-type power storage element.

[0059] The storage element 211 has: a container 211a having a long side and a short side and a pair of electrode terminals 211b (positive and negative electrodes). An electrode body, a pair of current collectors (positive and negative electrodes), and an electrolyte (non-aqueous electrolyte) are housed inside the container 211a, but their illustrations and detailed descriptions are omitted. The container 211a has a container body with an opening and a cover that closes the opening of the container body, and the electrode terminal 211b is arranged in a state of protruding from the cover in the positive direction of the Z axis. The electrode terminal 211b is 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 storage element (power generation element) formed by stacking positive electrode plates, negative electrode plates, and separators.

[0060] The end plates are components arranged at both ends of the arrangement when a plurality of storage elements are arranged in such a manner that the long sides of each storage element are opposed to each other. The side plates are components connected to the end plates at both ends. A pair of end plates 212 is sandwiched from both sides in the arrangement direction (X-axis direction) when a plurality of storage elements 211 are arranged in such a manner that the long sides of each storage element 211 are opposed to each other. The pair of end plates 212 is a restraining component that presses (restrains) the plurality of storage elements 211 from both sides in the arrangement direction (X-axis direction). A pair of side plates 213 is connected to the pair of end plates that restrain the plurality of storage elements 211. From the perspective of ensuring strength, etc., the end plates 212 and the side plates 213 are formed of metal components such as steel or stainless steel, but the material thereof is not particularly limited, and it may be formed of a component with high strength and insulation, or the metal component may be subjected to insulation treatment.

[0061] The end plate 212 is a plate-shaped and rectangular member arranged in the X-axis direction (the second direction intersecting the first direction) of the storage element 211. A pair of end plates 212 are arranged on both sides of the multiple storage elements 211 in the X-axis direction, and the multiple storage elements 211 are sandwiched from both sides in the X-axis direction to be held. The end plate 212 may not be a plate-shaped member, but a flat block-shaped member. The end plate 212 is an example of a "side member" arranged on the side (the second direction) of the storage element 211.

[0062] The end plate 212 (side member) has a protrusion 212a protruding in the Y-axis direction (first direction), and recesses 212b and 212c arranged in the Z-axis direction (third direction intersecting the first direction and the second direction) of the protrusion 212a. In this embodiment, both of the pair of end plates 212 have the protrusion 212a and the recesses 212b and 212c of the same structure.

[0063] The protrusion 212a is a flat and rectangular portion that protrudes from the approximate center of the Y-axis negative end of the end plate 212 in the Z-axis direction toward the Y-axis negative direction and extends in the Z-axis direction. The protrusion 212a is provided with a fixing portion 212d for fixing the end plate 212 to the side plate 213. In the present embodiment, the fixing portion 212d is a through hole for inserting a fixing member such as a bolt (not shown), and two fixing portions 212d arranged in the Z-axis direction are arranged at the root (the Y-axis positive end) of the protrusion 212a. Thus, the end plate 212 is fixed to the side plate 213 at the protrusion 212a.

[0064] The recessed portions 212b and 212c are disposed on both sides of the protruding portion 212a in the Z-axis direction so as to sandwich the protruding portion 212a, and are recessed from the protruding portion 212a in the Y-axis direction and the Z-axis direction. In the present embodiment, the recessed portions 212b and 212c are notches formed at the Y-axis negative end of the end plate 212 and at the corners of both end portions in the Z-axis direction.

[0065] Specifically, the recess 212b is a recess that is arranged in the positive direction of the Z axis of the protrusion 212a when viewed in the X axis direction and is recessed from the protrusion 212a to the positive direction of the Y axis. The recess 212b is also a recess that is recessed from the protrusion 212a to the negative direction of the Z axis. The recess 212b is a rectangular recess that is recessed in the positive direction of the Y axis and the negative direction of the Z axis at the negative direction end of the Y axis and the corner of the positive direction end of the Z axis of the rectangular end plate 212 (not shown). The recess 212b is a rectangular notch that is cut off in the positive direction of the Y axis and the negative direction of the Z axis at the negative direction end of the Y axis and the corner of the positive direction end of the Z axis of the rectangular end plate 212. The recess 212b is arranged in the X axis direction (second direction) of the external terminal 215. That is, in the end plate 212 in the positive direction of the X axis, the recess 212b is arranged adjacent to the positive direction of the X axis of the external terminal 215 in the positive direction of the X axis. In the end plate 212 in the negative X-axis direction, the recess 212b is arranged adjacent to the external terminal 215 in the negative X-axis direction. Thus, the external terminal 215 is arranged so that at least a portion thereof protrudes from the recess 212b when viewed from the X-axis direction.

[0066] The recess 212c is a recess that is arranged in the negative direction of the Z axis of the protrusion 212a when viewed in the X axis direction and is recessed from the protrusion 212a to the positive direction of the Y axis. The recess 212c is also a recess that is recessed from the protrusion 212a to the positive direction of the Z axis. The recess 212c is a rectangular recess that is recessed in the positive direction of the Y axis and the positive direction of the Z axis at the negative direction end of the Y axis and the corner of the negative direction end of the rectangular end plate 212 (not shown). The recess 212c is a rectangular notch that is cut out in the positive direction of the Y axis and the positive direction of the Z axis at the negative direction end of the Y axis and the corner of the negative direction end of the rectangular end plate 212 (not shown). The shape and size of the recess 212c are not particularly limited, but in the present embodiment, the length (depth) of the recess 212c in the Y axis direction is the same as that of the recess 212b, and the length (width) in the Z axis direction is shorter than that of the recess 212b. That is, the protrusion 212a is arranged at a position offset in the negative direction of the Z axis from the center position in the Z axis direction at the negative end of the Y axis direction of the end plate 212. In the present embodiment, in the Z axis direction, the total length of the recesses 212b and 212c is about the same as the length of the protrusion 212a. A more detailed description of the structure of the end plate 212 (side member) will be described later.

[0067] The side plate 213 is a plate-shaped and rectangular member arranged in the Y-axis direction of the storage element 211. That is, a pair of side plates 213 are arranged on both sides of the plurality of storage elements 211 in the Y-axis direction. The side plate 213 constrains the plurality of storage elements 211 by attaching both ends in the X-axis direction to the ends in the Y-axis direction of a pair of end plates 212 to connect the pair of end plates 212. That is, the side plate 213 extends in the X-axis direction in a manner spanning the plurality of storage elements 211, and imparts a constraining force in the X-axis direction to the plurality of storage elements 211. In the present embodiment, the side plate 213 is joined to the end plate 212 (fixed portion 212d of the protruding portion 212a) (fixed to the end plate 212 (fixed portion 212d of the protruding portion 212a)) by a fixing member such as a bolt and a nut (not shown). The side plate 213 may also be joined to the end plate 212 (fixed to the end plate 212) by welding or bonding. The side plate 213 may not be in the form of a plate, but may be in the form of a long rod.

[0068] The outer casing 214 is a member covering the positive direction of the Z axis of the plurality of storage elements 211, etc., and protects the plurality of storage elements 211, etc. from external impacts, etc. The outer casing 214 is mounted and fixed to a pair of side plates 213. In the present embodiment, the outer casing 214 is a metal member, but it may also be a resin member. An opening 214a is formed in the center of the outer casing 214 in the X axis direction at the negative end of the Y axis direction, through which wiring for monitoring or controlling the state (voltage, temperature, charge and discharge state, etc.) of the storage element 211 is passed.

[0069] The external terminal 215 is electrically connected to the electrode terminal 211b of the storage element 211, and is an external terminal for charging electricity from the outside and discharging electricity to the outside. In other words, the external terminal 215 is a terminal member different from the electrode terminal 211b of the storage element 211. The external terminal 215 is formed of a conductive member made of a metal such as aluminum, aluminum alloy, copper, copper alloy, nickel, or a combination thereof, or a conductive member other than a metal. The external terminal 215 is arranged at the end of the storage element unit 210 in the Y-axis direction (first direction). In this embodiment, a pair of (positive and negative) external terminals 215 arranged in the X-axis direction are arranged at the end of the storage element unit 210 in the Y-axis negative direction, the end in the Z-axis positive direction, and both ends in the X-axis direction. The external terminal 215 is arranged in a state of protruding from the main body of the storage element unit 210 (the part where the storage element 211 is arranged) in the Y-axis negative direction. Specifically, the external terminal 215 protrudes in the negative Y-axis direction from the negative Y-axis surface of the side plate 213 and the negative Y-axis surface of the exterior member 214 .

[0070] The cover member 216 is a cover member of the external terminal 215 configured to cover the external terminal 215. The cover member 216 is formed of insulating members 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), polyetheretherketone (PEEK), tetrafluoroethylene-perfluoroalkylvinyl ether (PFA), polytetrafluoroethylene (PTFE), polyethersulfone (PES), polyamide (PA), ABS resin or composite materials thereof, or metal with insulating coating. The cover member 216 protects the external terminal 215 and prevents the external terminal 215 from contacting with external metal members.

[0071] [3. Description of the structure of the end plate 212 (side member)]

[0072] Next, the structure of the end plate 212 (side member) of the electricity storage element unit 210 will be described in more detail. Figure 5 It is a plan view showing the positional relationship between the energy storage device unit 210 and the inner case 300 according to the present embodiment. Figure 5 This is a diagram of a structure in which the inner case upper wall 310 is removed from the inner case 300 in a state where the electric storage element unit 210 is housed for convenience of explanation, as viewed from the positive direction of the Z axis. Figure 6 It is a front view showing the positional relationship between the electric storage device unit 210 and the inner case 300 according to the present embodiment. Figure 6 The figure is a view of the structure in which the outer case side wall 113 and the inner case side wall 350 in the negative direction of the Y axis are removed from the outer case body 110 in a state where the storage cells 20 (storage element cell group 200 , inner case 300 ) and the weight 400 are housed for convenience of explanation, as viewed from the negative direction of the Y axis.

[0073] like Figure 5 As shown, in the storage element unit 210, the protrusion 212a of the end plate 212 protrudes in the Y-axis direction (first direction) more than the external terminal 215. The protrusion 212a protrudes in the Y-axis direction (first direction) more than the cover member 216. That is, the protrusion 212a protrudes in the negative direction of the Y-axis more than the external terminal 215, and protrudes in the negative direction of the Y-axis more than the cover member 216. The inner housing side wall 350 is arranged in the negative direction of the Y-axis of the protrusion 212a, and the protrusion 212a is in contact with the inner housing side wall 350. That is, the external terminal 215 and the cover member 216 are arranged so as to be separated from the inner housing side wall 350 without contacting the inner housing side wall 350. The inner housing side wall 350 is an example of a "wall portion" arranged in the Y-axis direction (first direction) of the protrusion 212a.

[0074] The end of the end plate 212 in the positive direction of the Y axis also contacts the inner shell side wall 360. Figure 5 as well as Figure 6 As shown, the end plates 212 of the storage element unit group 200 located at both ends in the X-axis direction are in contact with the inner case side walls 330 and 340. Specifically, the end plate 212 in the positive direction of the X-axis of the storage element unit 210 located at the end in the positive direction of the X-axis is in contact with the inner case side wall 330. The end plate 212 in the negative direction of the X-axis of the storage element unit 210 located at the end in the negative direction of the X-axis is in contact with the inner case side wall 340. In this way, for the storage element unit group 200, any end plate 212 is in contact with the inner surface of the inner case 300 on both sides in the X-axis direction and both sides in the Y-axis direction. When the inner case side walls 330 to 360 have a plate-like member on the inner surface as described above, the end plate 212 is in contact with the plate-like member.

[0075] Two storage element units 210 adjacent to each other in the X-axis direction are arranged so that the end plates 212 facing each other in the X-axis direction are in contact with each other (overlap in the X-axis direction). Similarly, two storage element units 210 adjacent to each other in the Z-axis direction are arranged so that the end plates 212 facing each other in the Z-axis direction are in contact with each other (overlap in the Z-axis direction). When another member is sandwiched between the end plates 212, the end plates 212 are in indirect contact with each other via the other member.

[0076] Two storage element cells 210 adjacent to each other in the X-axis direction are described as a first storage element cell 210a and a second storage element cell 210b. Two storage element cells 210 adjacent to each other in the Z-axis direction are described as a first storage element cell 210a and a third storage element cell 210c. Figure 6 , the storage element cell 210 in the upper section of the left column is the first storage element cell 210a. The storage element cell 210 in the upper section of the center column is the second storage element cell 210b. The storage element cell 210 in the lower section of the left column is the third storage element cell 210c. The storage element cell 210 in the lower section of the center column is the fourth storage element cell 210d.

[0077] like Figure 6As shown, the first power storage element unit 210a and the second power storage element unit 210b are arranged side by side in the X-axis direction (second direction). The end plate 212 (side member) of the first power storage element unit 210a and the end plate 212 (side member) of the second power storage element unit 210b are arranged adjacent to each other in the X-axis direction (second direction). Therefore, the protrusion 212a of the end plate 212 (side member) of the first power storage element unit 210a and the protrusion 212a of the end plate 212 of the second power storage element unit 210b are arranged adjacent to each other in the X-axis direction. The recessed portion 212b1 of the end plate 212 (side member) of the first power storage element unit 210a and the recessed portion 212b2 of the end plate 212 of the second power storage element unit 210b are arranged adjacent to each other in the X-axis direction. The recessed portion 212 c 1 included in the end plate 212 (side member) of the first electricity storage element unit 210 a and the recessed portion 212 c 2 included in the end plate 212 of the second electricity storage element unit 210 b are arranged adjacent to each other in the X-axis direction.

[0078] like Figure 6 As shown, the first power storage element unit 210a and the third power storage element unit 210c are arranged in the Z-axis direction (third direction). The end plate 212 (side member) of the first power storage element unit 210a and the end plate 212 (side member) of the third power storage element unit 210c are arranged adjacent to each other in the Z-axis direction (third direction). As a result, the concave portion 212c1 of the end plate 212 of the first power storage element unit 210a arranged in the positive direction of the Z axis is connected to the concave portion 212b3 of the end plate 212 of the third power storage element unit 210c arranged in the negative direction of the Z axis, forming a larger concave portion 212bc. Figure 6 The same applies to the structure in which the recessed portions 212b, 212c of the third power storage element cell 210c in the lower stage of the left column and the recessed portions 212b, 212c of the fourth power storage element cell 210d in the lower stage of the center column are adjacent to each other in the X-axis direction. Figure 6 The same is true for the structure in which the recess 212c of the second power storage element unit 210b in the upper section of the central row and the recess 212b of the fourth power storage element unit 210d in the lower section of the central row are adjacent in the Z-axis direction. Sometimes, the recess 212b is referred to as the first recess, the recess 212c is referred to as the second recess, and the recess 212bc is referred to as the third recess. The third recess is a recess formed by connecting the first recess and the second recess in the Z-axis direction.

[0079] With such a structure, between the external terminals 215, 215 of the storage element units 210 that are adjacent and different in the X-axis direction, the recess 212b of one storage electronic unit 210 and the recess 212b of the other storage electronic unit 210 are arranged adjacent to each other in the X-axis direction. Between the negative ends of the two storage element units 210 that are adjacent to each other in the X-axis direction, the recess 212c of one storage electronic unit 210 and the recess 212c of the other storage electronic unit 210 are arranged adjacent to each other in the X-axis direction. Wiring connected to the external terminals 215 (main circuit wiring connecting the two adjacent external terminals 215) or control wiring led out from the opening 214a of the outer casing 214 are arranged in these recesses. The recesses 212b and 212c are formed to have a size that allows the wiring and the like to pass through. For the recess 212bc formed by connecting the recess 212b and the recess 212c in the Z-axis direction, the recess is enlarged in the Z-axis direction, so that the wiring path can be increased. The wiring can be arranged obliquely relative to the X-axis direction or the Z-axis direction via the recess 212bc. By configuring the protrusion 212a, a space in which the wiring can be arranged is formed in the negative direction of the Y-axis of the storage element unit 210. Thus, the wiring can be arranged in the negative direction of the Y-axis of the storage element unit group 200 so as to cross multiple storage element units 210 in the X-axis direction and the Z-axis direction.

[0080] In the present embodiment, when the power storage unit 20 is inserted into the outer shell body 110, a gap is formed between the inner shell side walls 330, 340 and the counterweight 400, but this gap may not be formed. A gap is also formed between the inner shell side walls 350, 360 and the outer shell side wall 113 of the outer shell body 110, but this gap may not be formed. When a gap is formed, when inserting the power storage unit 20 into the outer shell body 110, the insertion operation becomes easy, thereby improving the workability. When no gap is formed, the use efficiency of the space in the power storage device 10 can be improved.

[0081] [4. Description of the Effect]

[0082] As described above, according to the power storage device 10 involved in the embodiment of the present invention, the end plate 212 (side member) of the power storage element unit 210 has a protrusion 212a that protrudes from the external terminal 215. As a result, it is possible to prevent the external terminal 215 and the wiring connected to the external terminal 215 from contacting with other members and being damaged due to vibration or impact from the outside. Therefore, the external terminal 215 and the wiring can be protected by a simple structure, so that the vibration resistance or impact resistance of the power storage device 10 can be easily improved. By configuring the protrusion 212a that protrudes from the external terminal 215, a space is formed around the external terminal 215, so that the wiring can be configured in the space.

[0083] Since the protruding portion 212 a of the end plate 212 (side member) protrudes further than the cover member 216 of the external terminal 215 , the external terminal 215 can be protected together with the cover member 216 .

[0084] Since the end plate 212 (side member) has the recessed portions 212 b and 212 c in the Z-axis direction (third direction) of the protruding portion 212 a , wiring and the like connected to the external terminal 215 can be arranged in the recessed portions 212 b and 212 c .

[0085] Since the recessed portion 212 b of the end plate 212 (side member) is disposed laterally (in the X-axis direction (second direction)) of the external terminal 215 , wiring and the like connected to the external terminal 215 can be easily disposed in the recessed portion 212 b .

[0086] By arranging the recessed portion 212b1 of the end plate 212 (side member) of the first power storage element unit 210a and the recessed portion 212b2 of the end plate 212 (side member) of the second power storage element unit 210b at adjacent positions, wiring etc. for connecting the external terminals 215 of the two power storage element units 210 (210a, 210b) can be arranged through the two recessed portions 212b (212b1, 212b2). The same is true for the recessed portion 212c.

[0087] Since the inner case side wall 350 as a wall portion is arranged in the Y-axis direction (first direction) of the protruding portion 212a of the end plate 212 (side member), even when an impact is applied from the outside in the Y-axis direction (first direction), the inner case side wall 350 is in contact with the protruding portion 212a, thereby protecting the external terminal 215 and the like. Since the protruding portion 212a is in contact with the inner case side wall 350 (the protruding portion 212a is pressed by the inner case side wall 350), the movement of the storage element unit 210 can be restricted. Wiring and the like can be arranged in the space formed by the protruding portion 212a and the inner case side wall 350.

[0088] [5. Description of Modifications]

[0089] Although the power storage device 10 according to the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. The embodiment disclosed herein is illustrative in all respects, and all modifications within the meaning and scope equivalent to the claims are included within the scope of the present invention.

[0090] In the above embodiment, a protrusion 212a and recesses 212b and 212c are formed at the negative end of the end plate 212 in the Y-axis direction, but instead of or in addition to this, the same protrusion and recess may be formed at the positive end of the end plate 212 in the Y-axis direction.

[0091] In the above embodiment, the recesses 212b and 212c are notches formed at the corners of the rectangular end plate 212, but they may be recesses that are recessed in the Y-axis direction and formed other than the corners of the rectangular end plate 212. The recesses 212b and 212c may also be recesses that are recessed in the Z-axis direction and formed other than the corners of the rectangular end plate 212. The recess 212b may not be arranged in the X-axis direction of the external terminal 215 but may be arranged at a position offset from the X-axis direction of the external terminal 215. The two recesses 212b of the two adjacent end plates 212 of the two adjacent storage element units 210 may not be adjacent in the X-axis direction but may be arranged at offset positions. The same is true for the recess 212c. In such a structure, the external terminal 215 and wiring, etc. can also be protected by the protrusion 212a. As long as the wiring, etc. can be arranged by utilizing the recesses 212b and 212c, the use efficiency of the space in the storage device 10 can be improved.

[0092] In the above embodiment, the end plate 212 has the recessed parts 212b and 212c on both sides of the protruding part 212a in the Z-axis direction, but it is not necessary to have the recessed parts 212b or 212c. Alternatively, the end plate 212 does not have both the recessed parts 212b and 212c, and the protruding part 212a is a part of the end plate 212 in the Z-axis direction that protrudes in the Y-axis direction as a whole. The shape of the end plate 212 in this case is, as an example, a rectangular shape when viewed in the X-axis direction.

[0093] In the above embodiment, for the electric storage element unit 210, the protrusion 212a of the end plate 212 is in contact with the inner case side wall 350 of the inner case 300, but the protrusion 212a may be configured not to be in contact with the inner case side wall 350. The inner case 300 may not have the inner case side wall 350. Similarly, the electric storage element unit 210 may be configured so that the end plate 212 is not in contact with the inner case side wall 360, and the electric storage element unit 210 at the end may be configured so that the end plate 212 is not in contact with the inner case side wall 330 or 340. The inner case 300 may not have any of the inner case side walls 330, 340, and 360.

[0094] In the above embodiment, the protrusion 212a of the end plate 212 protrudes in the Y-axis direction more than the cover member 216, but it may be configured to protrude the same amount as the cover member 216, or less than the cover member 216. The storage element unit 210 may not have the cover member 216. In the above structure, the external terminal 215 and wiring, etc. can also be protected by the protrusion 212a.

[0095] In the above embodiment, all the storage element cells 210 included in the storage device 10 have the above structure, but any storage element cell 210 may not have the above structure. Both of the pair of end plates 212 included in the storage element cell 210 have the above structure, but any end plate 212 may not have the above structure.

[0096] In the above embodiment, in the storage element unit 210, the end plate 212 is used as an example of a side member, but the side plate may be used as an example of a side member, or other members may be used as an example of a side member. In the storage element unit 210 of the above embodiment, when the storage element 211 flat in the Y-axis direction is arranged in the Y-axis direction, the side plate is arranged at the position of the end plate 212. In this case, the side plate as an example of a side member may have a protrusion that protrudes in the Y-axis direction from the external terminal 215.

[0097] In the above embodiment, the power storage device 10 may include other weights such as a weight disposed along the outer case side wall 113 or the outer case bottom wall 111 of the outer case body 110 instead of the weight 400 or in addition to the weight 400. The weight 400 may not be joined to the outer case side wall 112 by welding or the like, but may be fixed to the outer case side wall 112 by being clamped between the inner case side wall 330 or 340 and the outer case side wall 112, or may not be fixed to the outer case side wall 112.

[0098] In the above embodiment, the inner shell 300 has six walls that are separated from each other, but it only needs to be composed of two or more components that are separated from each other. The inner shell 300 may also have only one component. For the inner shell 300, any of the six walls may be integrated, or no wall may be configured. The inner shell bottom wall 320 and at least one of the inner shell side walls 330~360 may be integrated (integrally formed), or the inner shell upper wall 310 and at least one of the inner shell side walls 330~360 may be integrated (integrally formed). The inner shell bottom wall 320 and at least one of the inner shell side walls 330~360 may not be configured. The inner shell 300 may also have a rod-shaped beam or the like instead of a plate-shaped wall.

[0099] In the above-described embodiment, the power storage device includes an inner case that houses the power storage element unit and an outer case that houses the inner case. However, the power storage device may not include an outer case.

[0100] In the above embodiment, the power storage device includes an inner case that accommodates the power storage element unit. However, the power storage device may include a wall portion disposed in the first direction of the protruding portion of the power storage element unit instead of an inner case.

[0101] In the above embodiment, the wiring is a wiring that connects two adjacent external terminals 215, but it can also be a wiring that connects two non-adjacent external terminals 215. The wiring can be arranged along the X-axis direction or along the Z-axis direction. The wiring can also be arranged obliquely relative to the X-axis direction or the Z-axis direction. The wiring arranged in the recess can be either the main circuit wiring or the control wiring. The control wiring may not be connected to the external terminal.

[0102] In the above embodiment, the power storage device 10 is not limited to having all the above structures, and it may not have the outer shell 100, the inner shell 300, the counterweight 400, etc. The power storage device only needs to have a structure including at least one power storage element unit. As an example, a power storage element unit 210 in the above embodiment can be a power storage device in the present invention.

[0103] Any combination of the above-described embodiments and modifications is also included in the scope of the present invention.

[0104] Industrial Applicability

[0105] The present invention can be applied to a power storage device or the like including a power storage element unit including a power storage element such as a lithium ion secondary battery.

[0106] Description of Reference Numerals

[0107] 10: power storage device, 20: power storage unit, 100: outer shell, 110: outer shell body, 120: outer shell cover, 200: power storage element unit group, 210, 210a, 210b, 210c, 210d: power storage element unit, 211: power storage element, 211a: container, 211b: electrode terminal, 212: end plate, 212a: protrusion, 212b, 212b1, 212b 2, 212b3, 212bc: recess, 212c, 212c1, 212c2: recess, 212d: fixing portion, 213: side plate, 214: exterior member, 214a: opening, 215: external terminal, 216: cover member, 300: inner shell, 310: upper wall of inner shell, 320: bottom wall of inner shell, 330, 340, 350, 360: side wall of inner shell, 400: counterweight.

Claims

1. A power storage device, wherein: The power storage device includes a power storage element unit having a power storage element and an external terminal. The external terminal is arranged at an end portion of the power storage element unit in the first direction. The electric storage element unit further includes a side member disposed in a second direction intersecting the first direction of the electric storage element. The side member has a protrusion that protrudes in the first direction beyond the external terminal.

2. The power storage device according to claim 1, wherein The power storage element unit further includes a cover member covering the external terminal. The protrusion protrudes in the first direction further than the cover member.

3. The power storage device according to claim 1 or 2, wherein: The side member has a recessed portion, The recessed portion is arranged in the first direction of the protruding portion, or the recessed portion is arranged in a third direction of the protruding portion that intersects the first direction and the second direction.

4. The power storage device according to claim 3, wherein: The recessed portion is arranged in the second direction of the external terminal.

5. The power storage device according to claim 3, wherein: The power storage device includes a plurality of the power storage element units. The plurality of power storage element units include a first power storage element unit and a second power storage element unit arranged in the second direction, The recessed portion included in the side member of the first electricity storage element unit and the recessed portion included in the side member of the second electricity storage element unit are arranged adjacent to each other in the second direction.

6. The power storage device according to claim 1 or 2, wherein: The power storage device further includes a wall portion disposed in the first direction of the protruding portion.

Images