WO2022186136A1

WO2022186136A1 - Power storage device

Info

Publication number: WO2022186136A1
Application number: PCT/JP2022/008287
Authority: WO
Inventors: 拓也中畑
Original assignee: 株式会社Ｇｓユアサ
Priority date: 2021-03-02
Filing date: 2022-02-28
Publication date: 2022-09-09
Also published as: JPWO2022186136A1

Abstract

Provided is a power storage device (10) comprising a power storage element (100) and a side plate (500) arranged in a first direction of the power storage element (100), wherein: the power storage element (100) or a spacer (200) arranged in a second direction intersecting the first direction of the power storage element (100) has a first surface (230a) facing the side plate (500) in a third direction intersecting the first direction and the second direction; the side plate (500) has a second surface (620a) facing the first surface (230a) in the third direction; and formed on at least one of the first surface (230a) and the second surface (620a) is a projection (231) projecting toward the other thereof.

Description

power storage device

The present invention relates to a power storage device including power storage elements and side plates.

Conventionally, in a power storage device that includes a power storage element and a side plate, a configuration is known in which one of the power storage element or a spacer on the side of the power storage element and the side plate has a projection projecting toward the other. Patent Literature 1 discloses a power supply device (power storage device) in which an insulating spacer on the side of a battery cell (power storage element) has a pressing region (protrusion) protruding toward a side plate.

WO2017/163696

In the power storage device having the above-described conventional configuration, if the contact area between the power storage element or the spacer and the side plate is increased, the vibration resistance or impact resistance performance (load resistance performance) can be improved. For this reason, in the conventional power storage device disclosed in Patent Document 1, it is desirable to increase the contact area between the projection (pressing region) of the spacer and the side plate. However, when the side plate is attached to the storage element, the side plate is attached while being in contact with the protrusions. Assembly of the plate may become difficult. Similarly, when projections are formed on the side plates, if the contact area between the projections and the energy storage element or spacer is large, the assembly load due to the projections increases, which may make it difficult to assemble the side plate to the energy storage element. The inventor has found that.

An object of the present invention is to provide a power storage device in which side plates can be easily attached to power storage elements.

A power storage device according to an aspect of the present invention is a power storage device including a power storage element and a side plate arranged in a first direction of the power storage element, wherein the power storage element or the second side plate of the power storage element A spacer arranged in a second direction that intersects the one direction has a first surface that faces the side plate in a third direction that intersects the first direction and the second direction, and the side plate: It has a second surface facing the first surface in the third direction, and at least one of the first surface and the second surface is formed with a protrusion projecting toward the other.

According to the power storage device of the present invention, it is possible to easily attach the side plate to the power storage element.

FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment. FIG. 2 is an exploded perspective view showing each component when the power storage device according to the embodiment is exploded. FIG. 3 is a perspective view showing the structure of the storage device according to the embodiment. 4A and 4B are a perspective view, a top view, and a front view showing the configuration of the spacer according to the embodiment. FIG. 5 is a cross-sectional view showing the positional relationship between the spacer, the storage element, and the side plate according to the embodiment. FIG. 6 is a cross-sectional view showing a step of assembling the side plate to the storage element and the spacer according to the embodiment. 7A is a front view showing a configuration of a spacer according to Modification 1 of the embodiment; FIG. 7B is a front view showing a configuration of a spacer according to Modification 1 of the embodiment; FIG. 7C is a front view showing a configuration of a spacer according to Modification 1 of the embodiment; FIG. 8A and 8B are a front view and a perspective view showing a configuration of a side plate according to Modification 2 of the embodiment. FIG.

According to this, it is possible to easily attach the side plate to the storage element.

The projection may have a sloped surface that slopes away from the side plate in the first direction as it goes away from the power storage element in the third direction.

According to this, since the protrusion has the inclined surface, when the side plate is attached to the storage element from the first direction, the side plate is attached to the storage element from the first direction along the inclined surface. Assemble. This makes it easier to attach the side plate to the storage element.

The side plate may have an insulating member on which the projection is formed.

According to this, the side plate has the insulating member, and the insulating member is formed with the projection. This makes it possible to realize a configuration that facilitates the attachment of the side plate to the storage element.

At least one of the first surface and the second surface may be formed with a plurality of projections projecting toward the other.

According to this, in the power storage device, the power storage element or the spacer and the side plate of the power storage element in the first direction have first and second surfaces facing each other in the third direction. A plurality of projections are formed on at least one of the surfaces so as to protrude toward the other surface. As a result, when the side plate is attached to the storage element from the first direction, the contact area of the other member with respect to one projection is reduced. Therefore, the mounting load due to the protrusion can be reduced, and the mounting of the side plate to the power storage element can be further facilitated.

The plurality of protrusions may be arranged at different positions in the first direction.

According to this, the plurality of protrusions formed on at least one of the first surface and the second surface of the storage element or spacer and side plate are arranged at different positions in the first direction. Thereby, when the side plate is assembled to the electric storage element from the first direction, the plurality of protrusions are sequentially contacted in the first direction. Therefore, since the assembling load due to the protrusion can be divided into a plurality of stages, the assembling load due to the protrusion can be reduced, and the side plate can be more easily attached to the power storage element.

The plurality of protrusions may be arranged at positions that do not overlap in the first direction.

According to this, the plurality of protrusions formed on at least one of the first surface and the second surface of the storage element or spacer and side plate are arranged at positions that do not overlap in the first direction. In this way, when the plurality of projections are arranged at positions that do not overlap in the first direction, when the side plate is assembled to the power storage element from the first direction, after contacting one projection in the first direction, the next contact with the protrusion of As a result, the mounting load due to the protrusion can be further reduced, and the mounting of the side plate to the power storage element can be further facilitated.

At least one protrusion among the plurality of protrusions may be arranged at a position overlapping with a part of the power storage element when viewed from the third direction.

According to this, since at least one of the plurality of protrusions is arranged at a position overlapping with a part of the storage element when viewed from the third direction, the side plate makes the storage element more visible in the third direction. It can be held firmly. As a result, it is possible to improve the resistance to vibration or shock (load resistance) of the electric storage device while facilitating the attachment of the side plate to the electric storage element.

At least one projection among the plurality of projections may have an inclined surface that inclines away from the side plate in the first direction as it goes away from the power storage element in the third direction.

According to this, since at least one projection among the plurality of projections has the inclined surface, when the side plate is attached to the power storage element from the first direction, the side plate is moved along the inclined surface in the first direction. It is attached to the storage element from one direction. This makes it easier to attach the side plate to the storage element.

The side plate may have an insulating member formed with the plurality of projections.

According to this, the side plate has an insulating member, and the insulating member is formed with a plurality of projections. This makes it possible to realize a configuration that facilitates the attachment of the side plate to the storage element.

The present invention can be realized not only as such a power storage device, but also as a combination of a power storage element and a side plate, or a combination of a power storage element, a spacer and a side plate.

Power storage devices according to embodiments of the present invention (including modifications thereof) will be described below with reference to the drawings. All of the embodiments described below are generic or specific examples. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, manufacturing processes, order of manufacturing processes, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. In each drawing, dimensions and the like are not strictly illustrated. In each figure, the same reference numerals are given to the same or similar components.

In the following description and drawings, the direction in which a pair of electrode terminals in one storage element are aligned, the direction in which a pair of short sides of a container for one storage element are aligned, or the direction in which a pair of side plates are aligned is referred to as the first direction. and the X-axis direction. The direction in which a plurality of energy storage elements are arranged, the direction in which a plurality of spacers are arranged, the direction in which a pair of end plates are arranged, the direction in which the energy storage element, the spacer, and the end plate are arranged, the direction in which a pair of long sides of a container of one energy storage element face each other, Alternatively, the thickness direction of the storage element, spacer, or end plate is defined as the second direction and the Y-axis direction. The direction in which the container body and lid of the container for the storage element are arranged, or the vertical direction, is defined as the third direction and the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that cross each other (perpendicularly in this embodiment). Depending on the mode of use, the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described below as the vertical direction.

In the following description, the positive direction of the X-axis indicates the direction of the arrow on the X-axis, and the negative direction of the X-axis indicates the direction opposite to the positive direction of the X-axis. The same applies to the Y-axis direction and the Z-axis direction. In the present embodiment, the positive direction of the X-axis indicates the direction toward one side (right) when the power storage device is viewed from the direction in which the power storage elements are arranged (Y-axis direction). The negative direction of the X-axis indicates the direction toward the other (left) when the power storage device is viewed from the direction in which the power storage elements are arranged (Y-axis direction). The positive direction of the Y-axis indicates the direction toward the back when the power storage device is viewed from the direction in which the power storage elements are arranged (Y-axis direction). The minus direction of the Y-axis indicates the direction toward the front when the power storage device is viewed from the direction in which the power storage elements are arranged (the Y-axis direction). The Z-axis plus direction indicates the direction in which the terminals of the storage elements are arranged when the storage device is viewed from the direction in which the storage elements are arranged (Y-axis direction). The negative direction of the Z-axis indicates the direction opposite to the direction in which the terminals of the storage elements are arranged when the storage device is viewed from the direction in which the storage elements are arranged (the Y-axis direction). Furthermore, expressions indicating relative directions or orientations such as parallel and orthogonal include cases where they are not strictly the directions or orientations. Two directions are orthogonal, not only means that the two directions are completely orthogonal, but also substantially orthogonal, that is, including a difference of about several percent also means

(Embodiment)
[1 General description of power storage device 10]
First, a general description of power storage device 10 in the present embodiment will be given. FIG. 1 is a perspective view showing the appearance of power storage device 10 according to the present embodiment. FIG. 2 is an exploded perspective view showing each component when power storage device 10 according to the present embodiment is exploded.

The power storage device 10 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in the present embodiment. The power storage device 10 is a battery module (assembled battery) used for power storage, power supply, or the like. Specifically, the power storage device 10 is used for driving mobile bodies such as automobiles, motorcycles, water crafts, ships, snowmobiles, agricultural machinery, construction machinery, or railroad vehicles for electric railways, or for starting engines. Used as a battery or the like. Examples of such vehicles include electric vehicles (EV), hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), and gasoline vehicles. Examples of railway vehicles for the electric railway include electric trains, monorails, linear motor cars, and hybrid trains having both diesel engines and electric motors. The power storage device 10 can also be used as a stationary battery or the like for home or business use.

As shown in FIGS. 1 and 2, the power storage device 10 includes a plurality of power storage elements 100, a plurality of

spacers

200 and 300, a pair of end plates 400, and a pair of side plates 500. The side plates 500 has an insulator 600 . The power storage device 10 also includes a bus bar that connects the power storage elements 100 in series or in parallel, but illustration and description thereof are omitted. In addition to the components described above, the power storage device 10 includes a busbar frame for positioning the busbars, an exterior body for housing the components, external terminals connected to external busbars, etc., and the state of charge of the power storage element 100. Also, a circuit board, fuses, relays, connectors, and other electric devices for monitoring or controlling the discharge state may be provided.

The power storage element 100 is a secondary battery (single battery) capable of charging and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The power storage element 100 has a flat rectangular parallelepiped shape (rectangular shape), and in the present embodiment, eight power storage elements 100 are arranged side by side in the Y-axis direction. The size and shape of the power storage element 100, the number of power storage elements 100 to be arranged, and the like are not limited, and only one power storage element 100 may be arranged. The storage element 100 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 storage element 100 may be a primary battery. The storage element 100 may be a battery using a solid electrolyte. The storage element 100 may be a pouch-type storage element. A detailed description of the configuration of the storage element 100 will be given later.

The

spacers

200 and 300 are plate-like and rectangular members that are arranged in the Y-axis direction (second direction) of the storage element 100 and electrically insulate the storage element 100 from other members. That is, the

spacers

200 and 300 are arranged in the Y-axis plus direction or the Y-axis minus direction of the storage elements 100 to electrically insulate the storage elements 100 from each other or the storage elements 100 and the end plate 400 .

Spacers

200 and 300 are made of 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-perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyethersulfone (PES), ABS resin, or It is formed of an electrically insulating member such as a composite material, a metal coated with an electrically insulating coating, or a heat insulating member such as a damper material.

The spacer 200 is a plate-like and rectangular spacer (intermediate spacer) parallel to the XZ plane that is arranged between two adjacent power storage elements 100 and electrically insulates between the two power storage elements 100. . Specifically, the spacer 200 faces the long side surfaces 111 and is in contact with the long side surfaces 111 between the long side surfaces 111 of the later-described containers 110 of the two storage elements 100. placed. In the present embodiment, seven spacers 200 and eight energy storage elements 100 are arranged alternately in the Y-axis direction. The number is also appropriately changed according to the number of storage elements 100 . When power storage elements 100 are connected in parallel, spacer 200 may not be arranged between power storage elements 100 connected in parallel. A detailed description of the configuration of the spacer 200 will be given later.

The spacer 300 is arranged between the power storage element 100 at the end and the end plate 400, electrically insulates between the power storage element 100 at the end and the end plate 400, and has a flat plate shape parallel to the XZ plane. It is a rectangular spacer (end spacer). Two spacers 300 are arranged between the storage elements 100 at both ends in the Y-axis direction and the pair of end plates 400 . Specifically, the spacer 300 is provided between the long side surface 111 of the container 110 of the storage element 100 at the Y-axis direction end and the Y-axis direction surface of the end plate 400 . It is arranged in a state of facing and abutting the surface.

In the present embodiment, the spacer 300 has such a shape that the spacer 200 is divided in half in the Y-axis direction. That is, the spacer 300 positioned in the positive Y-axis direction has the same shape as the portion on the negative Y-axis direction side when the spacer 200 is divided in half in the Y-axis direction. The spacer 300 located in the negative Y-axis direction has the same shape as the portion on the positive Y-axis direction when the spacer 200 is divided in half in the Y-axis direction. Therefore, the detailed configuration of the spacer 300 is assumed to conform to the detailed configuration of the spacer 200 to be described later, and the description thereof is omitted. Although FIG. 2 does not show the spacer 300 with a projection corresponding to the later-described projection 231 of the spacer 200 , the spacer 300 may have a projection similar to the projection 231 .

The end plate 400 and the side plate 500 are restraining members that externally press (constrain) the storage elements 100 in the direction in which the plurality of storage elements 100 are arranged (Y-axis direction). That is, the end plates 400 and the side plates 500 sandwich the plurality of power storage elements 100 from both sides in the alignment direction, thereby pressing (restraining) the power storage elements 100 included in the plurality of power storage elements 100 from both sides in the alignment direction. )do.

The end plates 400 are arranged on both sides of the plurality of energy storage elements 100 and the plurality of

spacers

200 and 300 in the Y-axis direction, and sandwich and hold the plurality of energy storage elements 100 and the like from both sides in the alignment direction (Y-axis direction). It is a plate-shaped (flat block-shaped) restraining member (sandwiching member). In other words, the pair of end plates 400 are arranged at positions sandwiching the plurality of energy storage elements 100 and the plurality of

spacers

200 and 300 in the Y-axis direction (the stacking direction of the electrode bodies of the electrode bodies of the energy storage elements 100). to bound. The end plate 400 is formed of a metal member such as steel or stainless steel from the viewpoint of securing strength, but the material is not particularly limited. The end plate 400 may be made of a high-strength, electrically insulating member, or may be made of a metal member subjected to insulation treatment.

The side plate 500 is a plate-like elongated restraint member (restraint bar) arranged in the X-axis direction (first direction) of the plurality of power storage elements 100 and the plurality of

spacers

200 and 300 . Specifically, the side plate 500 has both ends attached to a pair of end plates 400 and binds the pair of end plates 400 together to bind the plurality of power storage elements 100 and the plurality of

spacers

200 and 300 . In other words, the side plate 500 is arranged so as to extend in the Y-axis direction so as to straddle the plurality of storage elements 100 and the plurality of

spacers

200 and 300, and the arrangement direction (Y axial direction).

In the present embodiment, a pair of side plates 500 are arranged on both sides of the plurality of energy storage elements 100 and the plurality of

spacers

200 and 300 in the X-axis direction. The pair of side plates 500 are attached to the X-axis direction end portions of the pair of end plates 400 at both Y-axis direction end portions. Accordingly, the pair of side plates 500 and the pair of end plates 400 sandwich and constrain the plurality of power storage elements 100 and the like from both sides in the X-axis direction and both sides in the Y-axis direction. Specifically, the side plate 500 is connected (joined) to the end plate 400 by a plurality of (three in this embodiment) connecting members 500a arranged in the Z-axis direction. In the present embodiment, connecting member 500a is a bolt (screw), and is fastened by screwing with a female threaded portion formed in end plate 400. As shown in FIG. The connection (joining) of the side plate 500 to the end plate 400 is not limited to fixing with bolts (screws), and may be joined by welding, adhesion, or the like.

As described above, the side plate 500 has the insulator 600 on the inner side (on the power storage element 100 side). The insulators 600 are plate-shaped and elongated insulating members arranged on both sides of the plurality of power storage elements 100 and the plurality of

spacers

200 and 300 in the X-axis direction and extending in the Y-axis direction. In other words, the insulator 600 is arranged between the plurality of power storage elements 100 and the like and the side plate 500 (excluding the insulator 600 ) so as to straddle the plurality of power storage elements 100 and the plurality of

spacers

200 and 300 . Thereby, insulator 600 electrically insulates power storage elements 100 from side plate 500 (excluding insulator 600). The side plate 500 (excluding the insulator 600) is made of a metal member such as steel or stainless from the viewpoint of securing strength, like the end plate 400, but the material is not particularly limited. The side plate 500 (excluding the insulator 600) may be formed of a high-strength, electrically insulating member, or may be a metal member subjected to insulation treatment. The insulator 600 may be made of any electrically insulating material, and may be made of any electrically insulating material that can be used for the

spacers

200 and 300 .

[2 Explanation of storage element 100]
Next, the configuration of the storage element 100 will be described in detail. FIG. 3 is a perspective view showing the structure of the storage device 100 according to this embodiment. Specifically, FIG. 3 shows an enlarged appearance of one power storage element 100 out of the plurality of power storage elements 100 shown in FIG. Since the plurality of power storage elements 100 all have the same configuration, the configuration of one power storage element 100 will be described in detail below.

As shown in FIG. 3 , the electric storage element 100 includes a container 110 , a pair of electrode terminals 140 (positive electrode side and negative electrode side), and an upper gasket 150 . Inside the container 110, a lower gasket, an electrode body, a pair of current collectors (positive electrode side and negative electrode side), an electrolytic solution (non-aqueous electrolyte), etc. are accommodated, but illustration of these is omitted. . There is no particular limitation on the type of the electrolytic solution as long as it does not impair the performance of the storage element 100, and various types can be selected.

In addition to the components described above, the electric storage element 100 may have spacers arranged on the side or below the electrode body, an insulating film that wraps the electrode body, and the like. Furthermore, an insulating film (shrink tube or the like) covering the outer surface of the container 110 may be arranged around the container 110 . The material of the insulating film is not particularly limited as long as it can ensure electrical insulation required for the electric storage element 100 . Materials for the insulating film include electrically insulating resins such as PC, PP, PE, PPS, PET, PBT, and ABS resins, epoxy resins, Kapton, Teflon (registered trademark), silicon, polyisoprene, and polychloride. vinyl, etc.

The container 110 is a rectangular parallelepiped (square or box-shaped) case having a container body 120 with an opening and a lid 130 closing the opening of the container body 120 . The container main body 120 is a rectangular tubular member that constitutes the main body of the container 110 and has a bottom, and an opening is formed on the Z-axis positive direction side. The lid body 130 is a rectangular plate-like member that constitutes the lid portion of the container 110 , and is arranged to extend in the X-axis direction on the Z-axis plus direction side of the container body 120 . The container 110 (lid 130) has a gas discharge valve that releases the pressure when the pressure inside the container 110 is excessively increased, and an injection part for injecting an electrolytic solution into the container 110. etc. may be provided. The material of container 110 (container body 120 and lid 130) is not particularly limited, and weldable (joinable) metals such as stainless steel, aluminum, aluminum alloys, iron, and plated steel plates can be used. Resin can also be used as the material of the container 110 (container body 120 and lid 130).

The container 110 has a structure in which the container main body 120 and the lid 130 are joined by welding or the like after the electrode body and the like are accommodated inside the container main body 120, and the inside is sealed. The container 110 has a pair of long side surfaces 111 on both side surfaces in the Y-axis direction, a pair of short side surfaces 112 on both side surfaces in the X-axis direction, and a bottom surface 113 on the negative Z-axis direction side. The long side surface 111 is a rectangular planar portion that forms the long side surface of the container 110 and is arranged to face the

adjacent spacers

200 or 300 in the Y-axis direction. Long side 111 is adjacent to short side 112 and bottom 113 and has a larger area than short side 112 . The short side surface 112 is a rectangular planar portion that forms the short side surface of the container 110 and is arranged to face the side plate 500 in the X-axis direction. Short side 112 is adjacent to long side 111 and bottom 113 and has a smaller area than long side 111 . The bottom surface 113 is a rectangular planar portion that forms the bottom surface of the container 110 and is arranged adjacent to the long side surface 111 and the short side surface 112 .

The electrode terminal 140 is a terminal member (a positive electrode terminal and a negative electrode terminal) of the storage element 100 arranged in the lid 130, and is electrically connected to the positive electrode plate and the negative electrode plate of the electrode body via a current collector. there is That is, the electrode terminal 140 is made of a metal material for leading electricity stored in the electrode body to the external space of the storage element 100 and for introducing electricity into the internal space of the storage element 100 to store the electricity in the electrode body. It is a member made of The electrode terminal 140 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.

The electrode assembly is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate is formed by forming a positive electrode active material layer on a positive electrode substrate layer, which is a collector foil made of a metal such as aluminum or an aluminum alloy. The negative electrode plate is formed by forming a negative electrode active material layer on a negative electrode substrate layer, which is a collector foil made of a metal such as copper or a copper alloy. As the active material used for the positive electrode active material layer and the negative electrode active material layer, any known material can be appropriately used as long as it can intercalate and deintercalate lithium ions. A microporous sheet made of resin, a non-woven fabric, or the like can be used as the separator. In the present embodiment, the electrode body is formed by stacking electrode plates (a positive electrode plate and a negative electrode plate) in the Y-axis direction. The electrode body includes a wound electrode body formed by winding electrode plates (a positive electrode plate and a negative electrode plate), and a laminated (stacked) electrode formed by stacking a plurality of flat plate-shaped electrode plates. The electrode body may have any form, such as a body or a bellows-shaped electrode body in which an electrode plate is folded into a bellows shape.

The current collectors are conductive members (positive electrode current collector and negative electrode current collector) that are electrically connected to the electrode terminal 140 and the electrode body. The positive electrode current collector is made of aluminum, an aluminum alloy, or the like, like the positive electrode substrate layer of the positive electrode plate, and the negative electrode current collector, like the negative electrode substrate layer of the negative electrode plate, is made of copper, a copper alloy, or the like. there is

The upper gasket 150 is a gasket that is arranged between the lid 130 and the electrode terminal 140 to electrically insulate and seal between the lid 130 and the electrode terminal 140 . The lower gasket is a gasket that is placed between the lid 130 and the current collector to electrically insulate and seal between the lid 130 and the current collector. The upper gasket 150 and the lower gasket may be made of any material that has electrical insulation.

[3 Description of Spacer 200]
Next, the configuration of spacer 200 will be described in detail. 4A and 4B are a perspective view, a top view, and a front view showing the configuration of the spacer 200 according to this embodiment. Specifically, (a) of FIG. 4 is a perspective view showing an enlarged appearance of one spacer 200 out of the plurality of spacers 200 shown in FIG. FIG. 4(b) shows projections 231 (231a, 231b) in the negative direction of the X-axis of the spacer 200 shown in (a) of FIG. It is a top view which expands and shows a structure. In FIG. 4B, the container 110 for the two storage elements 100 when the two storage elements 100 are arranged on both sides of the spacer 200 in the Y-axis direction is also indicated by broken lines. (c) of FIG. 4 shows projections 231 (231a, 231b) in the negative direction of the X-axis of the spacer 200 shown in (a) of FIG. It is a front view which expands and shows a structure.

As shown in FIG. 4, the spacer 200 has the same shape at both ends in the X-axis direction. That is, the spacer 200 has a shape that is rotationally symmetrical when rotated 180° about an axis passing through the center position and parallel to the Z-axis direction. A rotationally symmetrical shape is preferable because it enables work to be performed without considering the orientation of the spacer during assembly. The spacer 200 has a spacer body portion 210 , a pair of spacer side wall portions 220 , a pair of spacer top wall portions 230 and a pair of spacer bottom wall portions 240 .

The spacer body portion 210 is a flat plate-like and rectangular portion that constitutes the body of the spacer 200, and is arranged parallel to the XZ plane. In the present embodiment, spacer main body 210 has long side surfaces in the Y-axis direction so as to cover the entire long side surface 111 of container 110 of power storage element 100 in the Y-axis plus direction or the Y-axis minus direction. 111 and is arranged in contact with the long side surface 111 .

The spacer side wall portion 220 is a plate-like and rectangular portion that protrudes in the Y-axis direction from the end portion of the spacer body portion 210 in the X-axis direction and extends in the Z-axis direction, and is arranged parallel to the YZ plane. . Specifically, a pair of spacer side wall portions 220 projecting from both ends of the spacer body 210 in the X-axis direction and extending in the Z-axis direction are arranged at both ends of the spacer 200 in the X-axis direction. ing. In the present embodiment, spacer side wall portion 220 is arranged along short side surface 112 of container 110 of power storage element 100 (see FIG. 5). Specifically, the spacer side wall portions 220 are short in the X-axis direction so as to cover half of the short side surface 112 of the container 110 on the Y-axis positive direction side or the Y-axis negative direction side on both sides of the power storage element 100 in the X-axis direction. It is arranged opposite to the side surface 112 . As a result, the entire short side surface 112 of the container 110 of the storage element 100 is covered by the spacer side wall portions 220 of the two spacers 200 sandwiching the storage element 100 in the Y-axis direction.

The spacer bottom wall portion 240 is a plate-like and rectangular portion that protrudes in the Y-axis direction from the end of the spacer body portion 210 in the negative Z-axis direction, and is arranged parallel to the XY plane. Specifically, a pair of spacer bottom wall portions 240 projecting to both sides in the Y-axis direction from both ends in the X-axis direction of the ends of the spacer body portion 210 in the negative Z-axis direction are arranged at both ends of the spacer 200 in the X-axis direction. ing. In the present embodiment, spacer bottom wall portion 240 is arranged along bottom surface 113 of container 110 of storage element 100 on the negative Z-axis direction side of storage element 100 (see FIG. 5). Specifically, the spacer bottom wall portion 240 is arranged in the Z-axis direction so as to cover half of the bottom surface 113 of the container 110 on the Y-axis positive direction side or the Y-axis negative direction side at both ends of the power storage element 100 in the X-axis direction. It is arranged to face the bottom surface 113 .

The spacer upper wall portion 230 is a plate-like and rectangular portion that protrudes in the Y-axis direction from the end portion of the spacer body portion 210 in the positive Z-axis direction, and is arranged parallel to the XY plane. Specifically, a pair of spacer upper wall portions 230 projecting to both sides in the Y-axis direction from both ends in the X-axis direction of the end portion of the spacer main body portion 210 in the positive Z-axis direction are arranged at both ends in the X-axis direction of the spacer 200 . ing. In the present embodiment, spacer upper wall portion 230 is arranged along lid 130 of container 110 of storage element 100 on the Z-axis positive direction side of storage element 100 (see FIG. 5). More specifically, the spacer upper wall portion 230 extends in the Z-axis direction so as to cover half of the lid 130 of the container 110 on the Y-axis positive direction side or the Y-axis negative direction side at both ends of the power storage element 100 in the X-axis direction. is arranged to face the lid body 130 at .

The spacer upper wall portion 230 has a first surface 230a that is one continuous surface (flat surface in the present embodiment) facing in the positive Z-axis direction. A plurality of protrusions 231 are formed for the purpose. As described above, the spacer 200 has a shape that is rotationally symmetrical when rotated 180° about an axis that passes through the center position and is parallel to the Z-axis direction. , the shapes match when rotated 180° about the axis. Therefore, of the pair of spacer upper wall portions 230, the configuration of the spacer upper wall portion 230 in the negative direction of the X axis will be mainly described below, and the configuration of the spacer upper wall portion 230 in the positive direction of the X axis will be Simplify or omit.

As shown in (b) and (c) of FIG. 4 in addition to (a) of FIG. ing. In this embodiment, the spacer upper wall portion 230 has two projections 231a and 231b as the plurality of projections 231. As shown in FIG.

The projections 231 (231a, 231b) are ribs in the shape of quartering a sphere. Specifically, the protrusion 231 has a shape corresponding to a portion located in the negative direction of the X-axis and the positive direction of the Z-axis when cut along a plane parallel to the XY plane and a plane parallel to the YZ plane passing through the center of the sphere. have. As a result, the protrusion 231 has a semicircular shape in which the negative direction of the X-axis is a circular arc when viewed from the positive direction of the Z-axis, and the negative direction of the X-axis and the positive direction of the Z-axis when viewed from the negative direction of the Y-axis are circular arcs. It has a fan shape with an angle of 90°. In other words, the projection 231 is elongated in the Y-axis direction and has a shape in which the surface in the negative direction of the X-axis is inclined.

Specifically, the projection 231 has a curved inclined surface 231c that inclines in the positive direction of the X-axis toward the positive direction of the Z-axis (see (c) of FIG. 4). In the present embodiment, power storage element 100 is arranged in the negative Z-axis direction of projection 231, and side plate 500 is arranged in the negative X-axis direction of projection 231 (see FIG. 5, etc.). Therefore, at least one protrusion 231 among the plurality of protrusions 231 is arranged in a direction away from the side plate 500 in the X-axis direction (first direction) as it goes away from the power storage element 100 in the Z-axis direction (third direction). It has an inclined surface 231c that inclines to . In the present embodiment, all protrusions 231 (231a and 231b) have inclined surfaces 231c.

The plurality of protrusions 231 (two protrusions 231a and 231b) are arranged at different positions in the X-axis direction (first direction). That is, the plurality of protrusions 231 are arranged at positions shifted in the X-axis direction (first direction). Specifically, the plurality of protrusions 231 (two protrusions 231a and 231b) are arranged at positions that do not overlap in the X-axis direction (first direction). That is, the plurality of protrusions 231 are arranged at positions spaced apart in the X-axis direction (first direction). Furthermore, the plurality of protrusions 231 (two protrusions 231a and 231b) are arranged at different positions in the Y-axis direction (second direction) as well. That is, the plurality of protrusions 231 are arranged at positions shifted in the Y-axis direction (second direction) as well. Specifically, the plurality of protrusions 231 (two protrusions 231a and 231b) are arranged at positions that do not overlap in the Y-axis direction (second direction). That is, the plurality of protrusions 231 are arranged at positions spaced apart in the Y-axis direction (second direction). The plurality of protrusions 231 (two protrusions 231a and 231b) are arranged at the same position in the Z-axis direction (third direction).

In the present embodiment, on the spacer upper wall portion 230 in the negative X-axis direction, the protrusion 231b is arranged in the positive direction of the X-axis and the negative direction of the Y-axis from the protrusion 231a. In the spacer upper wall portion 230 in the positive direction of the X-axis, a protrusion 231b is arranged in the negative direction of the X-axis and the positive direction of the Y-axis from the protrusion 231a. In this way, the plurality of protrusions 231 (two protrusions 231a and 231b) are positioned at different positions in the X-axis direction (first direction) and are arranged in positions that do not overlap in the Y-axis direction. , a plurality of protrusions 231 can be easily formed.

At least one protrusion 231 of the plurality of protrusions 231 is arranged at a position overlapping with a part of the power storage element 100 when viewed from the Z-axis direction (third direction). That is, at least one protrusion 231 is arranged directly above the power storage element 100 . Specifically, as shown in (b) of FIG. 4, all the projections 231 (both of the two projections 231a and 231b) are arranged at positions overlapping with a part of the storage element 100 when viewed from the Z-axis direction. be done. In the present embodiment, the two protrusions 231a and 231b are all arranged at positions overlapping the storage element 100 when viewed from the Z-axis direction (third direction). When viewed in the Z-axis direction (third direction), only a portion of the projection 231a may be arranged at a position overlapping the power storage element 100, or only a portion of the projection 231b may be arranged at a position overlapping with the power storage element 100. It doesn't have to be.

[4 Description of Positional Relationship Between Spacer 200, Energy Storage Element 100, and Side Plate 500]
Next, the positional relationship between the spacer 200, the storage element 100, and the side plate 500 will be described in detail. FIG. 5 is a cross-sectional view showing the positional relationship between spacer 200, power storage element 100, and side plate 500 according to the present embodiment. Specifically, (a) of FIG. 5 is a diagram showing a cross section of power storage device 10 shown in FIG. 1 taken along a plane parallel to the XZ plane through line VV. FIG. 5(b) is an enlarged cross-sectional view showing the configuration of the protrusion 231 in the negative direction of the X-axis of the spacer 200 shown in FIG. 5(a) and its surroundings. FIG. 6 is a cross-sectional view showing a step of assembling the side plate 500 to the storage element 100 and the spacer 200 according to this embodiment. Specifically, FIG. 6 is a diagram corresponding to (b) of FIG. 5, and (a) of FIG. (b) of FIG. 6 shows the configuration during assembly, and (c) of FIG. 6 shows the configuration after assembly.

As described above, the side plate 500 has the insulator 600. As shown in FIGS. , and a plate bottom wall portion 530 . The insulator 600 has an insulator body portion 610 , an insulator top wall portion 620 and an insulator bottom wall portion 630 . Since the pair of side plates 500 (insulators 600) have the same configuration, the side plate 500 (insulator 600) in the negative direction of the X axis will be described below, and the side plate 500 (insulator 600) in the positive direction of the X axis will be described. Explanations are simplified or omitted.

The plate body portion 510 is a plate-shaped and rectangular portion that is arranged in the negative X-axis direction of the insulator body portion 610 and extends in the Y-axis direction and parallel to the YZ plane. Plate body portion 510 is arranged in a state of being in contact with insulator body portion 610 in the X-axis direction. The plate upper wall portion 520 is an elongated plate-like portion that protrudes in the positive X-axis direction from the end portion of the plate main body portion 510 in the positive Z-axis direction and extends in the Y-axis direction. Plate upper wall portion 520 is arranged in a state of being inserted and fitted into insulator upper wall portion 620 from the negative direction of the X-axis. The plate bottom wall portion 530 is an elongated plate-like portion that protrudes in the positive X-axis direction from the end portion of the plate body portion 510 in the negative Z-axis direction and extends in the Y-axis direction. Plate bottom wall portion 530 is disposed in contact with insulator bottom wall portion 630 in the Z-axis direction in the negative Z-axis direction of insulator bottom wall portion 630 .

The insulator main body 610 is a plate-shaped and rectangular portion that is arranged in the negative X-axis direction of the plurality of storage elements 100 and the plurality of

spacers

200 and 300 and extends in the Y-axis direction and parallel to the YZ plane. The insulator body portion 610 is arranged in contact with the plurality of spacers 200 (spacer side wall portions 220) and 300 in the X-axis direction. Insulator bottom wall portion 630 is an elongated plate-like portion that protrudes in the positive X-axis direction from the end of insulator body portion 610 in the negative Z-axis direction and extends in the Y-axis direction. The insulator bottom wall portion 630 is arranged in contact with the plurality of spacers 200 (spacer bottom wall portions 240) and 300 in the Z-axis direction of the plurality of power storage elements 100 and the plurality of

spacers

200 and 300 in the Z-axis direction. be done.

The insulator upper wall portion 620 is a long plate-like portion arranged in the Z-axis positive direction of the plurality of power storage elements 100 and the plurality of

spacers

200 and 300 and extending in the Y-axis direction. The insulator upper wall portion 620 protrudes in the positive direction of the X-axis from the end of the insulator main body portion 610 in the positive direction of the Z-axis, bends in the positive direction of the Z-axis, and bends in the negative direction of the X-axis as viewed from the positive direction of the Y-axis. It has a C-shaped shape. As a result, a recess recessed in the positive direction of the X-axis is formed in the insulator upper wall portion 620, and the plate upper wall portion 520 is inserted and fitted into this recess. The insulator upper wall portion 620 is arranged in contact with the plurality of protrusions 231 formed on the spacer upper wall portions 230 of the plurality of spacers 200 in the Z-axis direction.

Specifically, the insulator upper wall portion 620 has a second surface 620a that is one continuous surface (a flat surface in the present embodiment) facing in the negative Z-axis direction. The second surface 620a is a surface facing the first surface 230a of the spacer upper wall portion 230 of the spacer 200 in the Z-axis direction. That is, the spacer 200 has a first surface 230a facing the side plate 500 (insulator 600) in the Z-axis direction (third direction), and the side plate 500 (insulator 600) extends in the Z-axis direction (third direction). ) has a second surface 620a facing the first surface 230a. A plurality of projections 231 projecting in the Z-axis direction (third direction) toward the second surface 620a are formed on the first surface 230a. The insulator upper wall portion 620 is arranged on the second surface 620a in contact with the plurality of projections 231 formed on the first surface 230a of the spacer upper wall portion 230 of the plurality of spacers 200 in the Z-axis direction. .

More specifically, as shown in (a) of FIG. 6, when the side plate 500 is attached to the storage element 100, the side plate 500 ( Insulator 600) is brought closer. Then, as shown in FIG. 6(b), the side plate 500 crushes the projection 231a of the spacer 200 via the insulator upper wall portion 620 of the insulator 600, while the X-axis plus the energy storage element 100 and the spacer 200. move in the direction Then, as shown in FIG. 6(c), the side plate 500 crushes the projection 231a of the spacer 200 with the insulator upper wall portion 620 of the insulator 600, and then crushes the projection 231b, so that the power storage element 100 and the spacer 200 are separated from each other. moves in the positive direction of the X-axis. That is, the side plate 500 (insulator 600) moves in the X-axis plus direction with respect to the storage element 100 and the spacer 200 while sequentially crushing the projections 231a and 231b of the spacer 200. FIG.

Thus, the projections 231 (projections 231a and 231b) are crushed ribs, and the insulator upper wall portion 620 is formed in a state where the plurality of projections 231 (projections 231a and 231b) formed on the plurality of spacers 200 are crushed. , abut on the plurality of protrusions 231 in the Z-axis direction. This restricts the movement of the side plate 500 (insulator 600) with respect to the power storage element 100 and the spacer 200 in the Z-axis direction.

Although the case where a plurality of projections 231 are arranged has been described as the present embodiment, only one projection 231 may be arranged in the embodiment of the present invention. In this case, the projection 231 may be arranged at either position of the projections 231a and 231b, or may be arranged in a shape straddling the projections 231a and 231b.

[5 Explanation of effect]
As described above, according to the power storage device 10 according to the embodiment of the present invention, the power storage element 100 or the spacer 200 and the side plate 500 have the

first surfaces

230a and 230a facing each other in the third direction (Z-axis direction). It has a second surface 620a. At least one of the first surface 230a and the second surface 620a is provided with a protrusion 231 that protrudes toward the other. By doing so, when assembling the side plate 500 to the power storage element 100 from the first direction, the side plate 500 can be easily assembled to the power storage element 100 .

At least one of the first surface 230a and the second surface 620a (in the present embodiment, the first surface 230a of the spacer 200) of the storage element 100 or the spacer 200 and the side plate 500 has a A plurality of protrusions are formed. As a result, when the side plate is attached to the storage element from the first direction, the contact area of the other member with respect to one projection is reduced. Therefore, the mounting load due to the protrusion can be reduced, and the mounting of the side plate to the power storage element can be further facilitated.

Thus, at least one of the first surface 230a and the second surface 620a (in the present embodiment, the first surface 230a of the spacer 200) of the storage element 100 or the spacer 200 and the side plate 500 is provided with a plurality of protrusions 231. , the plurality of protrusions 231 are arranged at different positions in the first direction. As a result, when the side plate 500 is assembled to the power storage element 100 from the first direction, the plurality of projections 231 are sequentially contacted in the first direction. Therefore, since the assembling load due to the protrusion 231 can be divided into a plurality of stages, the assembling load due to the protrusion 231 can be reduced, and the side plate 500 can be easily attached to the power storage element 100 .

The plurality of projections 231 formed on at least one of the first surface 230a and the second surface 620a (in the present embodiment, the first surface 230a of the spacer 200) of the energy storage element 100 or the spacer 200 and the side plate 500 are They are arranged in a non-overlapping position in one direction. In this way, since the plurality of protrusions 231 are arranged at positions that do not overlap in the first direction, when assembling the side plate 500 to the power storage element 100 from the first direction, one protrusion 231 , the next protrusion 231 is contacted. As a result, the mounting load due to the projections 231 can be further reduced, so that the mounting of the side plate 500 to the power storage element 100 can be further facilitated.

The protrusion 231 is arranged at a position overlapping with a part of the power storage element 100 when viewed from the third direction. At least one protrusion 231 (both protrusions 231a and 231b in the present embodiment) of the plurality of protrusions 231 is arranged at a position overlapping a part of the power storage element 100 when viewed from the third direction. Thereby, the power storage element 100 can be held more firmly by the side plate 500 in the third direction. While assembling the side plate 500 to the power storage element 100 is facilitated, the vibration resistance or shock resistance performance (load resistance performance) of the power storage device 10 can be improved.

The protrusion 231 has an inclined surface 231c. At least one protrusion 231 (both protrusions 231a and 231b in this embodiment) of the plurality of protrusions 231 has an inclined surface 231c. Accordingly, when assembling the side plate 500 to the storage element 100 from the first direction, the side plate 500 can be assembled to the storage element 100 from the first direction along the inclined surface 231c. Assembly of the side plate 500 to the storage element 100 can be made easier.

[6 Description of modified example]
Although power storage device 10 according to the present embodiment has been described above, the present invention is not limited to the above embodiment. The embodiments disclosed this time are illustrative in all respects and are not restrictive, and the scope of the present invention includes all modifications within the meaning and range of equivalents to the claims. .

In the above embodiment, the plurality of protrusions 231 are arranged at non-overlapping positions in the X-axis direction and the Y-axis direction, and are arranged at the same position in the Z-axis direction. However, the plurality of protrusions 231 may be arranged at positions where they partially overlap in at least one of the X-axis direction and the Y-axis direction. The plurality of protrusions 231 may be arranged at positions where they all overlap in the Y-axis direction. The plurality of protrusions 231 may be arranged at different positions in the Z-axis direction (partially not overlapping or not entirely overlapping) due to the first surface 230a being inclined in the Z-axis direction. . In other words, the plurality of protrusions 231 may be arranged at different positions in the X-axis direction.

In the above embodiment, all of the protrusions 231 are arranged at positions overlapping with a part of the storage element 100 when viewed from the Z-axis direction. However, at least a part of the protrusion 231 , not all of the protrusion 231 , may overlap a part of the power storage element 100 when viewed from the Z-axis direction. Alternatively, not all protrusions 231 but at least one protrusion 231 may overlap the power storage element 100 when viewed from the Z-axis direction. Alternatively, all the protrusions 231 do not have to overlap the power storage element 100 when viewed from the Z-axis direction.

In the above embodiment, all protrusions 231 have curved inclined surfaces 231c. However, at least one protrusion 231 among the plurality of protrusions 231 may have the inclined surface 231c, and any of the protrusions 231 may not have the inclined surface 231c. The inclined surface 231c may be a planar inclined surface instead of a curved inclined surface. Alternatively, a configuration in which not all protrusions 231 have inclined surfaces 231c may be used.

Although all the spacers 200 have the same configuration in the above embodiment, any one of the spacers 200 may have a configuration different from that described above.

The above embodiment may be modified as follows. 7A to 7C are front views showing configurations of spacers 201 to 203 according to Modification 1 of the present embodiment. Specifically, FIGS. 7A to 7C are diagrams corresponding to (c) of FIG. 4, in which the projections 232 to 234 of the spacers 201 to 203 in the negative direction of the X axis and their surroundings are shown from the front (the negative direction of the Y axis). direction) is shown in an enlarged manner.

As shown in FIGS. 7A, 7B and 7C, in this modified example,

spacers

201, 202 and 203 are arranged instead of the spacer 200 in the above embodiment.

Spacers

201, 202 and 203 have projections 232 (232a and 232b), projections 233 (233a and 233b), and projections 234 (234a) instead of projections 231 (231a and 231b) of spacer 200 in the above embodiment. and 234b). Since other configurations are the same as those of the above-described embodiment, detailed description thereof will be omitted.

The protrusions 232 (232a and 232b) are ribs formed on the first surface 230a of the spacer upper wall portion 230 of the spacer 201, and have a leaf spring shape (like a vaulting stool) with a hollow interior. ing. Like the plurality of protrusions 231, the plurality of protrusions 232 (232a and 232b) are arranged at different positions (non-overlapping positions) in the X-axis direction and at positions overlapping a part of the power storage element 100 when viewed from the Z-axis direction. and has an inclined surface 232c. In FIG. 7A, the end of the projection 232 on the X-axis plus direction (first direction) side and the first surface 230a are connected, but the end of the projection 232 on the X-axis plus direction (first direction) side and the first surface 230a are connected. It does not have to be connected to the one surface 230a.

The projections 233 (233a and 233b) are ribs formed on the first surface 230a of the spacer upper wall portion 230 of the spacer 202, and have the same plate spring shape as the projections 232, but have a spring 233d. In other words, the protrusion 233 has a configuration in which the leaf spring is supported by the spring 233d. The spring 233d may have any shape such as a spiral shape or a bellows shape, and may be made of any material such as metal or resin. Like the plurality of protrusions 231, the plurality of protrusions 233 (233a and 233b) are arranged at different positions (non-overlapping positions) in the X-axis direction and at positions overlapping with a part of the power storage element 100 when viewed from the Z-axis direction. and has an inclined surface 233c.

The protrusions 234 (234a and 234b) are plungers provided on the first surface 230a of the spacer upper wall portion 230 of the spacer 203. Like the plurality of protrusions 231, the plurality of protrusions 234 (234a and 234b) are arranged at different positions (non-overlapping positions) in the X-axis direction and at positions overlapping part of the power storage element 100 when viewed from the Z-axis direction. and has an inclined surface 234c.

As described above, according to the power storage device according to this modified example, the same effects as those of the above-described embodiment can be obtained. As in this modified example, various types of projections can be used as the projections provided on the spacer. The shape of the protrusion is not limited to the complex shape described above, and may be a columnar shape such as a cylindrical shape or a prismatic shape, or a simple shape such as a tubular shape such as a cylindrical shape or a rectangular shape, and the shape is not particularly limited.

Thus, the spacer has a first surface 230a facing the second surface 620a of the side plate 500, and the first surface 230a is formed with a plurality of projections projecting toward the second surface 620a. there is However, in addition to the spacer projections or instead of the spacer projections, the power storage element 100 has a first surface facing the second surface 620a of the side plate 500, and the first surface has a second surface A plurality of projections projecting toward 620a may be formed. In this case, the power storage device may not include spacer 200 . When the power storage element 100 has a protrusion, the protrusion is arranged at a position overlapping a part of the power storage element 100 (the part other than the protrusion) when viewed from the Z-axis direction (third direction).

Furthermore, in addition to or instead of the projections of the storage element 100 or the spacer, the second surface 620a of the side plate 500 may have a plurality of projections projecting toward the first surface 230a. . In this case, insulator upper wall portion 620 of insulator 600 may have a plurality of projections, or if side plate 500 does not have insulator 600, plate upper wall portion 520 of side plate 500 may have a plurality of projections. may be formed. That is, the power storage element 100 or the spacer has a first surface facing the side plate 500 in the Z-axis direction (third direction), and at least one of the first surface and the second surface 620a has a A plurality of protrusions protruding in the Z-axis direction (third direction) may be formed.

When the insulator 600 is formed with a plurality of projections, the side plate 500 has an insulating member (insulator 600) formed with a plurality of projections. In this case, the side plate 500 has a plurality of projections via an insulating member (insulator 600). This makes it possible to realize a configuration that facilitates assembly of the side plate 500 to the power storage element 100 .

An example of a configuration in which protrusions are formed on the plate upper wall portion 520 of the side plate 500 described above will be specifically described below. 8A and 8B are a front view and a perspective view showing the configuration of a side plate 501 according to Modification 2 of the present embodiment. Specifically, (a) of FIG. 8 is a front view showing the configuration when the plate upper wall portion 520 of the side plate 501 is viewed from the front (Y-axis negative direction), and (b) of FIG. 4 is a perspective view showing the configuration when the plate upper wall portion 520 is viewed obliquely from below; FIG.

As shown in FIG. 8, in this modified example, a side plate 501 is arranged instead of the side plate 500 in the above embodiment. The side plate 501 has a second surface 520a on the plate upper wall portion 520, which faces the first surface of the storage element 100 or the spacer. (521a and 521b). Since other configurations are the same as those of the above-described embodiment, detailed description thereof will be omitted.

A plurality of protrusions 521 (521a and 521b) are portions formed by forming cutouts 520b in the plate upper wall portion 520 and bending the cutout portions in the negative Z-axis direction. The plurality of protrusions 521 (521a and 521b) are arranged at different positions in the X-axis direction and at positions overlapping part of the storage element 100 when viewed in the Z-axis direction, and have inclined surfaces 521c. The inclined surface 521c is inclined in the X-axis direction away from the side plate 501 (plate body portion 510) (X-axis positive direction) as it goes away from the power storage element 100 in the Z-axis direction (Z-axis positive direction). It is an inclined plane. In particular, by notching the side plate 501 and bending the notched portion as in this modified example, the protrusion 521 can be easily formed.

When the

side plates

500 and 501 are assembled to the power storage element 100 from the first direction, the protrusions 232, 233, 234 and 521 are deformed. Protrusions 232 , 233 , 234 , 521 restrict movement of side plate 500 (insulator 600 ) with respect to power storage element 100 and spacer 200 in the Z-axis direction by utilizing biasing force due to deformation. Thus, according to the power storage device according to this modification, the same effects as those of the above-described embodiment can be obtained.

Although a case where a plurality of each of the projections 232, 233, 234, 521 are arranged has been described as the form of this modification, only one each of the projections 232, 233, 234, 521 is provided in the embodiment of the present invention. may be placed. By arranging a plurality of each of the projections 232, 233, 234, 521, the mounting load due to the projections can be further reduced, and the mounting of the side plate to the power storage element can be further facilitated, which is preferable.

When protrusions are formed on the side plates 500 in addition to the protrusions on the power storage elements 100 or the spacers, the plurality of protrusions on the power storage elements 100 or the spacers and the plurality of protrusions on the side plates 500 are alternately positioned. may be placed. In this case, power storage element 100 or spacer and side plate 500 may be assembled such that the plurality of protrusions of power storage element 100 or spacer and the plurality of protrusions of side plate 500 are combined. A configuration in which the power storage element 100 or the spacer has only one protrusion may be employed, and a configuration in which the side plate 500 has only one protrusion may be employed. That is, it suffices that the power storage element 100 or the spacer and the side plate 500 have a plurality of protrusions in total.

Forms constructed by arbitrarily combining the constituent elements included in the above embodiments and modifications thereof are also included within the scope of the present invention.

The present invention can be realized not only as such a power storage device, but also as a combination of the power storage element 100 and the side plate, or a combination of the power storage element 100, the spacer and the side plate.

The present invention can be applied to a power storage device or the like having a power storage element such as a lithium ion secondary battery.

10 power storage device 100 power storage element 110 container 140

electrode terminal

200, 201, 202, 203, 300 spacer 210 spacer main body 220 spacer side wall 230 spacer upper wall 230a first surface 231, 231a, 231b, 232, 232a, 232b, 233, 233a, 233b, 234, 234a, 234b, 521, 521a,

521b Projection

231c, 232c, 233c, 234c, 521c Inclined surface 233d Spring 240 Spacer bottom wall 400

End plate

500, 501 Side plate 510 Plate body 520 Plate

Upper wall portions

520a, 620a Second surface 520b Notch 530 Plate bottom wall portion 600 Insulator 610 Insulator body portion 620 Insulator upper wall portion 630 Insulator bottom wall portion

Claims

A power storage device comprising a power storage element and a side plate arranged in a first direction of the power storage element,
The energy storage element or a spacer arranged in a second direction intersecting the first direction of the energy storage element faces the side plate in a third direction intersecting the first direction and the second direction. having a first side,
the side plate has a second surface facing the first surface in the third direction;
A power storage device in which at least one of the first surface and the second surface is formed with a projection projecting toward the other.
The power storage device according to claim 1, wherein the protrusion has an inclined surface that slopes away from the side plate in the first direction as it goes away from the power storage element in the third direction.
The power storage device according to claim 1 or 2, wherein the side plate has an insulating member on which the projection is formed.
The power storage device according to claim 1, wherein at least one of the first surface and the second surface is formed with a plurality of protrusions projecting toward the other.
The power storage device according to claim 4, wherein the plurality of protrusions are arranged at different positions in the first direction.
The power storage device according to claim 4 or 5, wherein the plurality of protrusions are arranged at positions that do not overlap in the first direction.
7. The power storage device according to claim 4, wherein at least one of the plurality of protrusions is arranged at a position overlapping with a portion of the power storage element when viewed from the third direction.
At least one projection among the plurality of projections has an inclined surface that inclines away from the side plate in the first direction as it goes away from the power storage element in the third direction. The power storage device according to any one of the above.
The power storage device according to any one of claims 4 to 8, wherein the side plate has an insulating member on which the plurality of projections are formed.