JP2022029095A - Storage device - Google Patents

Abstract

To provide a power storage device that can prevent damage to internal components.SOLUTION: In a power storage device 10 having power storage elements 210 and spacers 221 arranged in a row in a first direction, the spacer 221 has a side wall portion 280 facing the power storage element 210 in a second direction intersecting the first direction and extending in a third direction intersecting the first and second directions, and a projection 282b (285b) protruding from the side wall portion 280 in the second direction and the side wall portion 280 has a concave wall portion 282 (285) in which the protrusion 282b (285b) is provided and which is concave in a direction opposite to the protruding direction of the protrusion 282b (285b).SELECTED DRAWING: Figure 7

Description

The present invention relates to a power storage device including a power storage element and a spacer.

Conventionally, there is known a power storage device including a power storage element and a spacer, in which the spacer has a wall portion around the power storage element. For example, Patent Document 1 discloses a battery module (storage device) having a battery cell (storage element) and a spacer, and the spacer has a side wall portion, a bottom wall portion, and an upper wall portion around the battery cell. Has been done.

Japanese Unexamined Patent Publication No. 2017-174831

In a configuration in which the spacer has a wall portion around the power storage element as in the conventional power storage device, a gap (rattling) may occur between the wall portion and the power storage element due to a dimensional tolerance or the like. When the member is also arranged on the side opposite to the power storage element of the wall portion, a gap (rattling) may occur between the wall portion and the member due to a dimensional tolerance or the like. For example, in the conventional power storage device, the side wall portion of the spacer is arranged between the power storage element (battery cell) and the side plate, and the bottom wall portion of the spacer is arranged between the power storage element and the base plate. .. Therefore, a gap may be generated between the side wall portion of the spacer and the power storage element or the side plate, or a gap may be generated between the bottom wall portion of the spacer and the power storage element or the base plate. In such a case, the power storage element or the like may move in the power storage device due to vibration or impact applied to the power storage device, and the internal members of the power storage device may be damaged.

The present invention has been made by the inventor of the present application with a new focus on the above-mentioned problems, and an object of the present invention is to provide a power storage device capable of suppressing damage to internal members.

In order to achieve the above object, the power storage device according to one aspect of the present invention is a power storage device including a power storage element and a spacer arranged side by side in the first direction, and the spacer intersects the first direction. A wall portion facing the power storage element in the second direction and extending in the third direction intersecting the first direction and the second direction, and a protrusion protruding from the wall portion in the second direction. The wall portion has a concave wall portion provided with the protrusion and recessed in a direction opposite to the protrusion direction of the protrusion.

According to this, in the power storage device, the spacer lined up with the power storage element in the first direction has a protrusion protruding in the second direction from the wall portion facing the power storage element in the second direction and extending in the third direction. .. Further, the wall portion of the spacer is provided with the protrusion and has a concave wall portion recessed in the direction opposite to the protrusion direction of the protrusion. As described above, the spacer has a protrusion protruding from the wall portion toward the power storage element or in the direction opposite to the power storage element, so that the wall portion and the power storage element or the power storage element can be separated from each other. Even if there is a gap (rattling) between the member and the member on the opposite side, the protrusion can fill the gap. As a result, even if vibration or impact is applied to the power storage device, it is possible to suppress the movement of the power storage element or the like in the power storage device, so that it is possible to suppress damage to the internal members of the power storage device. can.

Further, when the protrusion is provided on the spacer, if the protrusion length is short, the protrusion may not be sufficiently crushed and the spacer, the power storage element, the member, or the like may be damaged. Therefore, a concave wall portion recessed in the direction opposite to the protruding direction of the protrusion is provided on the wall portion of the spacer, and the protrusion is provided on the concave wall portion. As a result, the protruding length of the protrusion can be increased, so that the protrusion cannot be sufficiently crushed and damage to the spacer, the power storage element, the member, or the like can be suppressed. Therefore, it is possible to prevent the internal members of the power storage device from being damaged.

Further, the concave wall portion includes a first wall portion provided with the protrusion, a second wall portion arranged at a position adjacent to the first wall portion in the third direction, the first wall portion and the said. It may have a deformed portion which is arranged between the second wall portions and enables a larger deformation of the first wall portion with respect to the second wall portion than other adjacent portions.

When the above protrusion is provided on the spacer, if the gap between the wall of the spacer and the power storage element or the member on the opposite side of the power storage element is small or the protrusion is hard, the protrusion will not be sufficiently crushed. , Spacer, power storage element or the member concerned may be damaged. Therefore, in the concave wall portion of the spacer, a deformed portion that enables large deformation of the first wall portion with respect to the second wall portion is arranged between the first wall portion and the second wall portion provided with the protrusion. .. As a result, when the protrusion is not sufficiently crushed, the deformed portion deforms the first wall portion with respect to the second wall portion, thereby suppressing damage to the spacer, the power storage element, the member, and the like. Can be done. Therefore, it is possible to prevent the internal members of the power storage device from being damaged.

Further, the concave wall portion has a first wall portion provided with the protrusion and a second wall portion arranged at a position adjacent to the first wall portion in the third direction, and the first wall portion. The wall portion may be thinner in the second direction than the second wall portion.

According to this, in the concave wall portion of the spacer, the first wall portion is thinner than the second wall portion, so that even if the first wall portion is provided with a protrusion, the first wall portion is a protrusion. Can suppress the protrusion on the opposite side. As a result, even in a configuration in which a concave wall portion is provided on the wall portion of the spacer to suppress damage to the internal members of the power storage device, it is possible to prevent the concave wall portion from protruding to the opposite side of the protrusion, thus saving space. Can be achieved.

Further, the concave wall portion has a first wall portion provided with the protrusion and a second wall portion arranged at a position adjacent to the first wall portion in the third direction, and the first wall portion. As for the wall portion, a surface opposite to the protrusion side of the second wall portion may be arranged on the protrusion side.

According to this, in the concave wall portion of the spacer, the surface of the first wall portion provided with the protrusion is arranged on the protrusion side with the surface opposite to the protrusion side of the second wall portion. Even if the wall portion is deformed to the side opposite to the protrusion, it is possible to prevent the first wall portion from protruding to the side opposite to the protrusion. As a result, even in a configuration in which a concave wall portion is provided on the wall portion of the spacer to suppress damage to the internal members of the power storage device, it is possible to prevent the concave wall portion from protruding to the opposite side of the protrusion, thus saving space. Can be achieved.

Further, a side member facing the spacer in the second direction is provided, and the side member has a concave portion into which the concave wall portion is inserted or a convex portion inserted into the concave wall portion. You may decide to be there.

According to this, since the side member facing the spacer has a concave portion into which the concave wall portion of the spacer is inserted or a convex portion inserted into the concave wall portion, the concave wall portion is utilized. , The spacer can be positioned with respect to the side member. As a result, even if vibration or impact is applied to the power storage device, it is possible to suppress the movement of the spacer, the power storage element, and the like in the power storage device, so that damage to the internal members of the power storage device is suppressed. be able to.

The present invention can be realized not only as a power storage device but also as a spacer.

According to the power storage device of the present invention, it is possible to suppress damage to internal members.

It is a perspective view which shows the appearance of the power storage device which concerns on embodiment. It is a perspective view which shows the inside of the exterior body by separating the main body and the cover of the exterior body in the power storage device which concerns on embodiment. It is an exploded perspective view which shows by disassembling the component inside the exterior body of the power storage device which concerns on embodiment. It is an exploded perspective view which shows each component by disassembling the electricity storage unit which concerns on embodiment. It is an exploded perspective view which shows each component by disassembling the power storage element which concerns on embodiment. It is a perspective view which shows the structure of the spacer which concerns on embodiment. It is a perspective view and the top view which enlargedly shows the structure of the concave wall part of the side wall part of the spacer which concerns on embodiment. It is the perspective view and the top view which enlargedly shows the structure of the flat wall part of the rear wall part of the spacer which concerns on embodiment. It is a perspective view which shows the structure of the side member which concerns on embodiment. It is a top view which shows the positional relationship of a spacer, a power storage element and a side member which concerns on embodiment.

Hereinafter, a power storage device according to an embodiment of the present invention (including a modification thereof) will be described with reference to the drawings. It should be noted that all of the embodiments described below are comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, manufacturing processes, order of manufacturing processes, etc. shown in the following embodiments are examples, and are not intended to limit the present invention. Further, in each figure, the dimensions and the like are not exactly shown. Further, in each figure, the same or similar components are designated by the same reference numerals.

In the following description and drawings, the longitudinal direction of the exterior body of the power storage device, the arrangement direction of the power storage unit and the electric device unit, the arrangement direction of a plurality of side members, the extension direction of the end member, the short side surface of the container of the power storage element. The facing direction or the arrangement direction of the pair of electrode terminals in one power storage element is defined as the X-axis direction. The direction in which the power storage element and the bus bar or the bus bar frame are arranged, or the direction in which the container body and the lid of the power storage element are arranged is defined as the Y-axis direction. The direction in which the main body of the exterior of the power storage device and the lid are arranged, the direction in which the pair of end members are arranged, the direction in which the power storage element and the spacer and the end member are arranged, the direction opposite to the long side surface of the container of the power storage element, and the flat direction of the power storage element. , The stacking direction or the vertical direction of the electrode plates of the electrode body of the power storage element is defined as the Z-axis direction. These X-axis directions, Y-axis directions, and Z-axis directions intersect each other (orthogonally in the present embodiment). Depending on the usage mode, 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.

Further, in the following description, for example, the X-axis plus direction indicates the arrow direction of the X-axis, and the X-axis minus direction indicates the direction opposite to the X-axis plus direction. The same applies to the Y-axis direction and the Z-axis direction. Further, in the following, the Z-axis direction may be referred to as a first direction or an arrangement direction, the X-axis direction may be referred to as a second direction, and the Y-axis direction may be referred to as a third direction. Further, expressions indicating relative directions or postures such as parallel and orthogonal include cases where they are not strictly the directions or postures. For example, the fact that two directions are orthogonal not only means that the two directions are completely orthogonal, but also that they are substantially orthogonal, that is, a difference of, for example, about several percent. It also means to include.

(Embodiment)
[1 General description of power storage device 10]
First, a schematic configuration of the power storage device 10 according to the present embodiment will be described. FIG. 1 is a perspective view showing the appearance of the power storage device 10 according to the present embodiment. FIG. 2 is a perspective view showing the inside of the exterior body 100 by separating the main body and the lid of the exterior body 100 in the power storage device 10 according to the present embodiment. FIG. 3 is an exploded perspective view showing the inner components of the exterior body 100 of the power storage device 10 according to the present embodiment in an exploded manner.

The power storage device 10 is a device capable of charging electricity from the outside and discharging electricity to the outside, and has a substantially rectangular parallelepiped shape in the present embodiment. For example, the power storage device 10 is a battery module (assembled battery) used for power storage, power supply, and the like. Specifically, the power storage device 10 is for driving or starting an engine of a moving body such as an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railroad vehicle for an electric railway. It is used as a battery or the like. Examples of the above-mentioned vehicle include an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), and a gasoline vehicle. Examples of the railcars for electric railways include trains, monorails, maglev trains, and hybrid trains equipped with both diesel engines and electric motors. The power storage device 10 can also be used as a stationary battery or the like used for home use, a generator, or the like.

As shown in FIGS. 1 to 3, the power storage device 10 includes an exterior body 100, and a power storage unit 200 and an electric device unit 300 housed in the exterior body 100. In addition to the above components, the power storage device 10 is connected to the outside by an exhaust unit for exhausting the gas discharged from the power storage unit 200 to the outside of the exterior body 100 and the electric device unit 300 by an electric wire or the like. It may be provided with a connector or the like for transmitting the signal of.

The exterior body 100 is a box-shaped (substantially rectangular parallelepiped) container (module case) that constitutes the exterior body of the power storage device 10. That is, the exterior body 100 is arranged outside the power storage unit 200 and the electric equipment unit 300, and these power storage units 200 and the electric equipment unit 300 are fixed at predetermined positions to protect them from impacts and the like. The exterior body 100 includes, for example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (including modified PPE). PET), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), tetrafluoroethylene / perfluoroalkylvinyl ether (PFA), polytetrafluoroethylene (PTFE), polyethersulfon (PES), ABS resin, or , These composite materials and other insulating members, or insulatingly coated metal and the like. As a result, the exterior body 100 prevents the power storage unit 200 and the electric device unit 300 from coming into contact with an external metal member or the like. The exterior body 100 may be made of a conductive member such as metal as long as the electrical insulation of the power storage unit 200 and the electric device unit 300 is maintained.

The exterior body 100 has an exterior body main body 110 that constitutes the main body of the exterior body 100, and an exterior body lid body 120 that constitutes the lid body of the exterior body 100. The exterior body body 110 is a bottomed rectangular tubular housing (housing) having an opening formed on the Z-axis plus direction side, and accommodates the power storage unit 200 and the electrical equipment unit 300. The exterior body body 110 has a bottom wall portion 111, four side wall portions 112, and a plurality of projecting portions 113.

The bottom wall portion 111 is a flat plate-shaped and rectangular wall portion that is arranged on the Z-axis minus direction side of the exterior body main body 110 and forms the bottom surface of the exterior body main body 110. A rib 111a is formed on the surface of the bottom wall portion 111 in the plus direction of the Z axis. The rib 111a is a convex portion protruding in the Z-axis plus direction from the Z-axis plus direction surface of the bottom wall portion 111, and extends in the X-axis direction and over substantially the entire surface of the bottom wall portion 111 in the Z-axis plus direction. A plurality of ribs 111a extending in the Y-axis direction are formed. The four side wall portions 112 are arranged on both sides in the X-axis direction and both sides in the Y-axis direction of the exterior body body 110, and have two short side surfaces on both sides in the X-axis direction and two long side surfaces on both sides in the Y-axis direction of the exterior body body 110. It is four flat plate-shaped and rectangular wall portions forming the above.

The projecting portion 113 is a member that penetrates the bottom wall portion 111 in the Z-axis direction and projects from the Z-axis plus direction surface of the bottom wall portion 111 in the Z-axis plus direction. In the present embodiment, two protrusions 113 arranged in the Y-axis direction are arranged at each of the central portion in the X-axis direction and the end portion in the plus direction of the X-axis of the bottom wall portion 111. Each protruding portion 113 has a portion protruding from the bottom wall portion 111 in the plus direction of the Z axis by being inserted into an opening formed in the end member 230 and the side member 240 (openings 230b and 244 described later). , Attached to the end member 230 and the side member 240.

For example, the protruding portion 113 is a bolt such as a sealing bolt, and the male screw portion of the bolt is arranged so as to project from the surface of the bottom wall portion 111 in the Z-axis positive direction with respect to the rib 111a in the Z-axis positive direction. There is. Then, the male threaded portion of the protruding portion 113 is screwed into the female threaded portion formed in at least one of the openings 230b and 244, so that the bottom wall portion 111 is attached to the end member 230 and the side member 240. .. In the present embodiment, the protruding portion 113 has a bottom wall portion 111 in which the male screw portion penetrates the opening 230b of the end member 230 and is screwed into the female screw portion of the opening 244 of the side member 240. Is fixed to the side member 240 with the end member 230 sandwiched between them.

As described above, one of the exterior body 100 and the side member 240 (the exterior body 100 in the present embodiment) protrudes toward the other (the side member 240 in the present embodiment) (protruding portion 113). The other has an opening (opening 244) into which the protrusion is inserted. Then, the side member 240 is fixed to the exterior body 100 by fixing the protruding portion (projecting portion 113) to the other (side member 240) in the opening (opening 244).

The exterior body lid 120 is a flat rectangular member that closes the opening of the exterior body main body 110. The exterior body lid 120 is preferably airtightly or watertightly bonded to the exterior body body 110 by an adhesive, heat seal, ultrasonic welding, laser welding, or the like. In the exterior body lid 120, a pair of external terminals 130, which are a pair of module terminals (total terminals) on the positive electrode side and the negative electrode side, are arranged at both ends in the minus direction and the Y axis direction in the X-axis direction. The power storage device 10 charges electricity from the outside and discharges electricity to the outside through the pair of external terminals 130. The external terminal 130 is formed of, for example, a conductive member made of a metal such as aluminum, an aluminum alloy, copper, or a copper alloy.

The power storage unit 200 is flat and flat in the Z-axis direction by arranging (flat stacking) in the Z-axis direction and arranging in the X-axis direction in a state where a plurality of power storage elements 210 are placed horizontally (sideways). It has a long shape in the X-axis direction. Specifically, the power storage unit 200 includes a plurality of power storage elements 210 arranged in the Z-axis direction and the X-axis direction, a pair of end members 230 and a plurality (three) side members 240 in the Z-axis direction and a spacer 220. It has a configuration of sandwiching in the X-axis direction. A more detailed description of the configuration of the power storage unit 200 will be described later.

The electric device unit 300 includes an electric device 310, a mounting member 320, and a bus bar unit 330. The electric device 310 is a device capable of monitoring the state of the power storage element 210 included in the power storage unit 200 and controlling the power storage element 210. In the present embodiment, the electric device 310 is a flat rectangular member arranged and attached in the X-axis plus direction of the power storage unit 200. The electric device 310 has, for example, an electric component such as a circuit board, a shunt resistor, and a connector for monitoring the charge state and the discharge state of the power storage element 210 and controlling the charge / discharge state of the power storage element 210. The electrical device 310 has a configuration in which these electrical components are housed in an insulating cover member.

The mounting member 320 is a flat plate-shaped member that mounts the electric device 310 to the power storage unit 200. The mounting member 320 is formed of, for example, any electrically insulating resin material that can be used for the exterior body 100. The mounting member 320 is arranged between the power storage unit 200 and the electric device 310, and is mounted on the power storage unit 200 and the electric device 310 is mounted. In the present embodiment, the mounting member 320 is mounted on the side surface of the power storage unit 200 in the plus direction of the X-axis, so that the power storage unit 200 is in an upright posture (a posture parallel to the YZ plane). Attach to the side surface in the plus direction of the X-axis.

Specifically, the mounting member 320 is mounted on the end member 230 and the side member 240, which will be described later, of the power storage unit 200. More specifically, the mounting member 320 has four protrusions 321 at both ends in the Z-axis direction and both ends in the Y-axis direction. The protruding portion 321 has a portion that protrudes in the Z-axis direction toward the end member 230, and the portion is inserted into the openings (openings 230c and 244 described later) formed in the end member 230 and the side member 240. By doing so, it is attached to the end member 230 and the side member 240. For example, the protrusion 321 is a bolt, and the male threaded portion of the bolt is screwed into the female threaded portion formed in at least one of the openings 230c and 244, whereby the mounting member 320 becomes the end member 230 and the end member 230. It is attached to the side member 240.

The bus bar unit 330 has a bus bar, a relay (junction), and the like, and electrically connects the power storage unit 200 and the electric device 310, electrically connects the electric device 310 and the external terminal 130, and the power storage unit. The 200 and the external terminal 130 are electrically connected. The bus bar may be used to connect the bus bar 250 described later of the power storage unit 200 to the electric device 310, to connect the electric device 310 to the external terminal 130, to connect the bus bar 250 to the relay, or to connect the relay. It is a plate-shaped member that connects to the external terminal 130. The bus bar is formed of, for example, a conductive member made of metal such as aluminum, aluminum alloy, copper, copper alloy, nickel, or a combination thereof, or a conductive member other than metal.

[2 Explanation of the configuration of the power storage unit 200]
Next, the configuration of the power storage unit 200 will be described in detail with reference to FIG. 4 in addition to FIG. FIG. 4 is an exploded perspective view showing each component by disassembling the power storage unit 200 according to the present embodiment. In FIG. 4, the bus bar 250 and the bus bar frame 251 of the power storage unit 200 are omitted.

As shown in FIGS. 3 and 4, the power storage unit 200 includes a plurality of power storage elements 210 (211 and 212), a plurality of spacers 220 (221 and 222), and a pair of end members 230 (231 and 232). It has three side members 240, a plurality of bus bars 250, and a bus bar frame 251.

The power storage element 210 is a secondary battery (cell battery) capable of charging electricity and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. .. The power storage element 210 has a flat rectangular parallelepiped shape (square shape), and in the present embodiment, the eight power storage elements 210 are laid horizontally (sideways) (the long side surface of the power storage element 210 is Z). They are arranged in the Z-axis direction and the X-axis direction (in the state of facing the axial direction). Specifically, the four storage elements 211 on the minus direction side of the X axis are arranged (flatly stacked) in the Z axis direction (arrangement direction), and the four storage elements 212 on the plus direction side of the X axis are arranged in the Z axis direction (arrangement direction). ) Are arranged (flat stacking). The four power storage elements 211 and the four power storage elements 212 are arranged side by side in the X-axis direction. A detailed description of the configuration of the power storage element 210 (211 and 212) will be described later.

The number of power storage elements 210 is not particularly limited, and any number of power storage elements 210 may be stacked (flatly stacked) in the Z-axis direction, and any number of power storage elements 210 may be arranged in the X-axis direction. You may. That is, the power storage unit 200 may have only one power storage element 210. The shape of the power storage element 210 is not limited to the above-mentioned prismatic shape, and may be a polygonal pillar shape, a cylindrical shape, an elliptical pillar shape, a long cylindrical shape, or the like. The power storage element 210 is not limited to the non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery, or may be a capacitor. The power storage element 210 may be a primary battery that can use the stored electricity without being charged by the user, instead of the secondary battery. The power storage element 210 may be a battery using a solid electrolyte. The power storage element 210 may be a pouch-type power storage element.

The spacer 220 (221, 222) is arranged (arranged) side by side with the power storage element 210 in the Z-axis direction (first direction, arrangement direction), and has a flat plate shape that electrically insulates the power storage element 210 from other members. Moreover, it is a rectangular member. The spacer 220 (221, 222) is formed of, for example, any electrically insulating resin material that can be used for the exterior body 100 described above.

Specifically, the spacer 221 is an intermediate spacer (inter-cell spacer) arranged adjacent to the power storage element 210 in the Z-axis direction. That is, the spacer 221 is arranged between two adjacent power storage elements 210 (between the two power storage elements 211 and between the two power storage elements 212), and electrically between the two power storage elements 210. Insulate. In the present embodiment, three spacers 221 are arranged corresponding to the four storage elements 211, but when the number of the storage elements 211 is other than four, the number of spacers 221 is also the number of the storage elements 211. It is changed as appropriate according to the number. The same applies to the power storage element 212.

The spacer 222 is an end spacer arranged at the end of the plurality of spacers 220 in the Z-axis direction (first direction, arrangement direction), and is arranged adjacent to the end of the power storage element 210 in the Z-axis direction. To. The spacer 222 is arranged between the power storage element 210 at the end (the power storage element 211 and the power storage element 212 at the end) and the end member 230 (231, 232), and the power storage element 210 and the end member 230 (at the end) are arranged. It is electrically insulated from 231 and 232). That is, two spacers 222 are arranged on both sides of the four storage elements 211 in the Z-axis direction, and two spacers 222 are arranged on both sides of the four storage elements 212 in the Z-axis direction.

The spacer 220 (221, 222) has walls on both sides in the X-axis direction and both sides in the Y-axis direction, and is arranged on both sides in the X-axis direction and both sides in the Y-axis direction of the power storage element 210. It is also electrically insulated from the members. For example, in the spacer 220 (221, 222), the wall portion is arranged between the power storage element 210 and the side member 240, and electrically insulates between the power storage element 210 and the side member 240. A detailed description of the configuration of the spacer 220 (221) will be described later.

The end member 230 and the side member 240 are members (constraint members) that press (constrain) the power storage element 210 from the outside in the Z-axis direction. That is, the end member 230 and the side member 240 press the respective storage elements 210 and the plurality of spacers 220 from both sides in the Z-axis direction by sandwiching the plurality of storage elements 210 and the plurality of spacers 220 from both sides in the Z-axis direction. (to restrict. The end member 230 and the side member 240 are made of a metal member such as stainless steel, aluminum, aluminum alloy, iron, or a plated steel plate, but may be made of an insulating member such as a highly rigid resin. good.

The end members 230 (231 and 232) are arranged at positions that sandwich the plurality of power storage elements 210 (211 and 212) and the plurality of spacers 220 (221 and 222) in the Z-axis direction, and a pair that sandwiches them in the Z-axis direction. It is a flat plate-shaped member (end plate). As a result, the pair of end members 230 collectively restrain the plurality of storage elements 210 and the plurality of spacers 220 in the Z-axis direction (the binding force in the Z-axis direction is collectively bound to the plurality of storage elements 210 and the plurality of spacers 220). And give it). The end member 231 is the end member 230 on the Z-axis minus direction side of the pair of end members 230, and the end member 232 is the end member 230 on the Z-axis plus direction side. The end member 230 (231, 232) may be a block-shaped or rod-shaped member instead of a flat plate-shaped member.

The side member 240 is a flat plate-shaped member (side plate) arranged so as to face the spacer 220 at a position adjacent to the spacer 220 in the X-axis direction (second direction intersecting the first direction). Both ends of the side member 240 are attached to the pair of end members 230, and by connecting the pair of end members 230, the plurality of power storage elements 210 and the plurality of spacers 220 are restrained. That is, the side member 240 is arranged so as to extend in the Z-axis direction so as to straddle the plurality of power storage elements 210 and the plurality of spacers 220, and these side arrangement directions (Z-axis direction) with respect to the plurality of power storage elements 210 and the like. ) Is given a binding force. The side member 240 may be a block-shaped or rod-shaped member instead of a flat plate-shaped member.

In the present embodiment, there are three side members in the X-axis negative direction of the plurality of power storage elements 211, between the plurality of power storage elements 211 and the plurality of power storage elements 212, and in the X-axis plus direction of the plurality of power storage elements 212. 240 is arranged. That is, in the X-axis direction (second direction), two sets of power storage elements 210 and spacer 220 are arranged at positions sandwiching the central side member 240, and at positions sandwiching the two sets of power storage elements 210 and spacer 220. Two side members 240 are arranged. Then, these three side members 240 are attached to both ends in the X-axis direction and the center of the pair of end members 230 at both ends in the Z-axis direction. As a result, the end member 230 and the side member 240 sandwich and restrain the plurality of power storage elements 210 and the plurality of spacers 220 from both sides in the X-axis direction and both sides in the Z-axis direction.

Specifically, the end member 230 (231, 232) has a protrusion 230a (231a, 232a), and is connected (joined) to each side member 240 by the protrusion 230a. In the present embodiment, three projecting portions 230a arranged in the Y-axis direction are arranged at each of the central portion and both ends in the X-axis direction of the end member 230. The protruding portion 230a has a portion that protrudes in the Z-axis direction from the surface of the end member 230 on the side member 240 side toward the side member 240, and the portion is inserted into the opening 243 formed in the side member 240. By doing so, it is attached to the side member 240.

For example, the protruding portion 230a is a bolt, and the end member 230 is attached to the side member 240 by screwing the male screw portion of the bolt into the female screw portion formed in the opening 243. Alternatively, the protruding portion 230a is a self-tap bolt (tapping bolt), and the end member 230 is attached to the side member 240 by being screwed while forming a female screw portion in the opening 243. The arrangement position and number of the protrusions 230a are not particularly limited. Further, the method of connecting the end member 230 and the side member 240 may be another method, for example, welding, caulking joining, adhesion, welding or the like. A detailed description of the configuration of the side member 240 will be described later.

Further, in the end member 230 (231, 232), between the three protruding portions 230a (231a, 232a) arranged in the Y-axis direction at the central portion in the X-axis direction and the end portion in the X-axis positive direction, respectively. , The above-mentioned two openings 230b (231b, 232b) are arranged. That is, the three protrusions 230a (231a, 232a) and the two openings 230b (231b, 232b) are alternately arranged in the Y-axis direction. The opening 230b (231b, 232b) is a circular through hole that penetrates the end member 230 (231, 232) in the Z-axis direction. At the end of the end member 230 (231, 232) in the minus direction of the X axis, the above-mentioned two openings 230c (231c, 232c) is arranged. That is, the three protrusions 230a (231a, 232a) and the two openings 230c (231c, 232c) are alternately arranged in the Y-axis direction. The opening 230c (231c, 232c) is a circular through hole that penetrates the end member 230 (231, 232) in the Z-axis direction.

The bus bar 250 is a flat plate-shaped member connected to the power storage element 210. Specifically, the bus bar 250 is arranged in the negative direction of the Y-axis of the plurality of power storage elements 210, and is connected (bonded) to the electrode terminals 210b of the plurality of power storage elements 210 and the bus bar unit 330. That is, the bus bar 250 connects the electrode terminals 210b of the plurality of power storage elements 210 to each other, and also connects the electrode terminals 210b of the power storage element 210 at the end to the bus bar unit 330. In the present embodiment, the bus bar 250 and the electrode terminal 210b of the power storage element 210 are connected (joined) by welding, but may be connected (joined) by bolt fastening or the like. The bus bar 250 is formed of, for example, a conductive member made of metal such as aluminum, aluminum alloy, copper, copper alloy, nickel, or a combination thereof, or a conductive member other than metal. In the present embodiment, the bus bar 250 is formed by connecting two power storage elements 210 in parallel to form four sets of power storage element groups, and the four sets of power storage element groups are connected in series. All eight power storage elements 210 may be connected in series, or may have other configurations.

The bus bar frame 251 is a flat rectangular insulating member capable of electrically insulating the bus bar 250 from other members and restricting the position of the bus bar 250. The bus bar frame 251 is made of, for example, any electrically insulating resin material that can be used for the exterior body 100. The bus bar frame 251 is arranged in the negative direction of the Y-axis of the plurality of power storage elements 210, and is positioned with respect to the plurality of power storage elements 210. Further, the bus bar 250 is positioned on the bus bar frame 251. As a result, the bus bar 250 is positioned with respect to the plurality of power storage elements 210 and is joined to the electrode terminals 210b of the plurality of power storage elements 210.

[3 Explanation of the configuration of the power storage element 210]
Next, the configuration of the power storage element 210 will be described in detail. FIG. 5 is an exploded perspective view showing each component by disassembling the power storage element 210 according to the present embodiment. Specifically, FIG. 5 shows an exploded view of each part of the power storage element 210 shown in FIG. 4 in a vertically placed (standing) state. Since the eight power storage elements 210 (four power storage elements 211 and four power storage elements 212) all have the same configuration, the configuration of one power storage element 210 will be described below.

As shown in FIG. 5, the power storage element 210 includes a container 210a, a pair of electrode terminals 210b (positive electrode side and negative electrode side), and a pair of gaskets 210c (positive electrode side and negative electrode side). Further, a pair of gaskets 210d (positive electrode side and negative electrode side), a pair of current collectors 210e (positive electrode side and negative electrode side), and an electrode body 210f are housed inside the container 210a. An electrolytic solution (non-aqueous electrolyte) is sealed inside the container 210a, but the illustration is omitted. The type of the electrolytic solution is not particularly limited as long as it does not impair the performance of the power storage element 210, and various types can be selected. Further, in addition to the above components, even if a spacer arranged on the side or below of the electrode body 210f, an insulating film for wrapping the electrode body 210f, or an insulating sheet covering the outer surface of the container 210a is arranged. good.

The container 210a is a rectangular parallelepiped (square or box-shaped) case having a container body 210a1 having an opening formed therein and a container lid portion 210a2 for closing the opening of the container body 210a1. With such a configuration, the container 210a has a structure in which the inside of the container 210a can be sealed by accommodating the electrode body 210f and the like inside the container body 210a1 and then welding the container body 210a1 and the container lid 210a2. It has become. The material of the container body 210a1 and the container lid 210a2 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate.

The container main body 210a1 is a rectangular cylindrical member having a bottom that constitutes the main body portion of the container 210a, and has an opening formed on the negative direction side of the Y axis. That is, the container body 210a1 has a pair of rectangular and planar (flat) long side surfaces on both side surfaces in the Z-axis direction, and a pair of rectangular and planar (flat) side surfaces on both side surfaces in the X-axis direction. ) It has a short side surface and a rectangular and flat (flat) bottom surface on the positive side of the Y-axis. The container lid portion 210a2 is a rectangular plate-shaped member constituting the lid portion of the container 210a, and is arranged so as to extend in the Y-axis negative direction side of the container main body 210a1 in the X-axis direction.

The electrode body 210f 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 a positive electrode active material layer formed on a positive electrode base material layer which is a current collecting foil made of a metal such as aluminum or an aluminum alloy. The negative electrode plate is a negative electrode active material layer formed on a negative electrode base material layer which is a current collecting 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, known materials can be appropriately used as long as they can occlude and release lithium ions. In the present embodiment, the electrode body 210f is formed by winding an electrode plate (positive electrode plate and negative electrode plate) around a winding axis (virtual axis parallel to the X-axis direction) extending in the X-axis direction. It is a type (so-called vertical winding type) electrode body.

Here, since the electrode plates (positive electrode plate and negative electrode plate) of the electrode body 210f are laminated in the Z-axis direction, the Z-axis direction is also referred to as a stacking direction. That is, the electrode body 210f is formed by laminating the electrode plates in the laminating direction. The electrode body 210f has a pair of flat portions 210f1 arranged in the Z-axis direction and a pair of curved portions 210f2 arranged in the Y-axis direction by winding the electrode plate. The stacking direction is the stacking direction of the electrode plates in the flat portion 210f1. The flat portion 210f1 is a flat portion connecting the ends of the pair of curved portions 210f2, and the curved portion 210f2 is a portion curved in a semicircular shape or the like so as to project in the Y-axis direction. Further, the direction in which the flat surface of the flat portion 210f1 faces or the direction in which the pair of flat portions 210f1 face each other can be defined as the stacking direction. Therefore, it can be said that the plurality of storage elements 211 arranged in the arrangement direction (Z-axis direction) are arranged in the stacking direction, and the plurality of storage elements 212 arranged in the arrangement direction (Z-axis direction) are also arranged in the stacking direction. It can be said that they are lined up.

Further, since the positive electrode plate and the negative electrode plate are wound around the electrode body 210f with the positive electrode plate and the negative electrode plate displaced from each other in the X-axis direction, the active material is formed at the ends of the positive electrode plate and the negative electrode plate in the shifted directions. It has a portion (active material layer non-forming portion) where the base material layer is exposed without being (coated). That is, the electrode body 210f protrudes from the flat portion 210f1 and the curved portion 210f2 on both sides in the X-axis direction at both ends in the X-axis direction, and the active material layer non-forming portions of the positive electrode plate and the negative electrode plate are laminated to collect electricity. It has a connecting portion 210f3 connected to the body 210e.

The electrode body 210f is a so-called horizontal winding type electrode body formed by winding an electrode plate around a winding axis extending in the Y-axis direction, and a laminate formed by laminating a plurality of flat plate-shaped electrode plates. Any form of electrode body may be used, such as a type (stack type) electrode body or a bellows type electrode body in which an electrode plate is folded into a bellows shape. In the case of the horizontal winding type electrode body, the flat part other than the curved part and the connection part (tab) with the current collector is the flat part, and in the case of the laminated type (stack type) and the bellows type electrode body, the flat part is the flat part. The flat part other than the connection part (tab) with the current collector is the flat part.

The electrode terminal 210b is a terminal (positive electrode terminal and negative electrode terminal) of the power storage element 210, and is arranged on the container lid portion 210a2 so as to project in the negative direction of the Y axis. The electrode terminal 210b is electrically connected to the positive electrode plate and the negative electrode plate of the electrode body 210f via the current collector 210e. The electrode terminal 210b is formed of a conductive member such as a metal such as aluminum, an aluminum alloy, copper, or a copper alloy.

The current collector 210e is a conductive member (positive electrode current collector and negative electrode current collector) that is electrically connected to the connection portion 210f3 of the electrode terminal 210b and the electrode body 210f. The current collector 210e is made of aluminum, an aluminum alloy, copper, a copper alloy, or the like. The gaskets 210c and 210d are flat plate-shaped sealing members having electrical insulating properties, which are arranged between the container lid portion 210a2, the electrode terminal 210b, and the current collector 210e. The gaskets 210c and 210d are formed of, for example, any electrically insulating resin material that can be used for the exterior body 100 described above.

[Explanation of the configuration of 4 spacer 221]
Next, the configuration of the spacer 221 will be described in detail. Since all the spacers 221 included in the power storage unit 200 have the same configuration, one spacer 221 will be illustrated and described below. FIG. 6 is a perspective view showing the configuration of the spacer 221 according to the present embodiment. Specifically, FIG. 6 shows the spacer 221 shown in FIG. 4 in an enlarged manner.

FIG. 7 is an enlarged perspective view and top view showing the configuration of the concave wall portions 282 and 285 of the side wall portion 280a of the spacer 221 according to the present embodiment. Specifically, FIG. 7A is an enlarged perspective view showing the configuration of the concave wall portions 282 and 285 of the side wall portion 280a surrounded by the broken line shown by the broken line in the spacer 221 shown in FIG. be. FIG. 7B is a perspective view of the configuration of FIG. 7A as viewed from the opposite side (X-axis minus direction). FIG. 7 (c) is a top view of the configuration of FIG. 7 (a) as viewed from the Z-axis plus direction. FIG. 8 is an enlarged perspective view and top view showing the configuration of the flat wall portion 291 of the rear wall portion 290 of the spacer 221 according to the present embodiment. Specifically, FIG. 8A is an enlarged perspective view showing the configuration of the flat wall portion 291 of the rear wall portion 290 surrounded by the broken line shown by the broken line in the spacer 221 shown in FIG. .. FIG. 8B is a top view of the configuration of FIG. 8A as viewed from the Z-axis plus direction.

As shown in these figures, the spacer 221 has a spacer body 260, a front wall portion 270, a pair of side wall portions 280 (280a and 280b), and a rear wall portion 290. The spacer main body 260 is a flat plate-shaped and rectangular portion constituting the main body of the spacer 221 and is arranged at a position facing the power storage element 210 in the Z-axis direction (first direction). Specifically, the spacer main body 260 is arranged so as to face the long side surface of the container 210a of the power storage element 210 and to be sandwiched between the long side surfaces of the two power storage elements 210. In the present embodiment, the spacer main body 260 is formed with a plurality of ribs 261, 262 and 263 extending in the X-axis direction on the main surfaces 260a on both sides in the Z-axis direction, but ribs extending in the Y-axis direction are formed. It may be formed or the rib may not be formed.

The front wall portion 270 is a flat plate-shaped wall portion that protrudes from the end edge of the spacer body 260 in the minus direction in the Y-axis direction on both sides in the Z-axis direction, faces the power storage element 210 in the Y-axis direction, and is in the X-axis direction. It is extended and placed. Specifically, the front wall portion 270 is abbreviated in the Z-axis direction of the Y-axis minus direction surface of the container lid portion 210a2 of the storage element 210 for each storage element 210 arranged on both sides of the spacer 221 in the Z-axis direction. Arranged to cover half. More specifically, the front wall portion 270 covers approximately half of the portion of the power storage element 210 in the negative direction in the Y-axis direction in the Z-axis direction except for the gas discharge valve and the electrode terminal 210b of the container lid portion 210a2. Arranged to cover.

The pair of side wall portions 280 are plate-shaped wall portions protruding from the edges on both sides of the spacer body 260 in the X-axis direction to both sides in the Z-axis direction, and face the power storage element 210 in the X-axis direction (second direction). Moreover, it is extended and arranged in the Y-axis direction (the first direction and the third direction intersecting the second direction). Specifically, the pair of side wall portions 280 are Z on both sides (short side surfaces) in the X-axis direction of the container body 210a1 of the storage element 210 for each storage element 210 arranged on both sides in the Z-axis direction of the spacer 221. It is arranged so as to cover approximately half in the axial direction. In the following, of the pair of side wall portions 280, the side wall portion 280 on the plus direction side of the X axis is also referred to as the side wall portion 280a, and the side wall portion 280 on the minus direction side of the X axis is also referred to as the side wall portion 280b.

The side wall portion 280a has a spacer convex portion 281 and concave wall portions 282 to 285. The side wall portion 280b also has a spacer convex portion 281 and concave wall portions 282 to 285, similarly to the side wall portion 280a. That is, the side wall portion 280b has a shape symmetrical with the side wall portion 280a with respect to the YZ plane passing through the center of the spacer main body 260. Therefore, in the following, the configuration of the side wall portion 280a will be described in detail, and the description of the configuration of the side wall portion 280b will be simplified or omitted.

The spacer convex portion 281 is a convex portion that protrudes in the plus direction of the X-axis. That is, the spacer convex portion 281 projects toward the side member 240. Specifically, the spacer convex portion 281 is a prismatic (in this embodiment, a square cylinder shape) convex portion extending in the Z-axis direction protruding in a rectangular shape toward the plus direction of the X-axis, and the side wall portion 280a. Two spacer convex portions 281 are arranged at the ends on both sides in the Y-axis direction of the above. In the present embodiment, the two spacer convex portions 281 have the same amount of protrusion in the plus direction of the X axis, and are arranged so as to protrude in the plus direction of the X axis from the concave wall portions 282 to 285. In the Y-axis direction, the spacer convex portion 281 in the Y-axis negative direction has a larger width than the spacer convex portion 281 in the Y-axis positive direction.

The concave wall portions 282 to 285 are arranged between the two spacer convex portions 281 and are concave portions that are rectangularly recessed in the plus direction or the minus direction of the X axis when viewed from the Z axis direction. Specifically, the concave wall portions 282 and 283 are concave portions having a U-shape (inverted C-shape) when viewed from the Z-axis direction, in which the surface in the minus direction of the X-axis is recessed in a rectangular shape toward the plus direction of the X-axis. It is extended and arranged in the Z-axis direction. Since the concave wall portions 282 and 283 have a surface in the plus direction of the X axis protruding in the plus direction of the X axis, a bulge extending in the Z axis direction extending in a rectangular shape toward the plus direction of the X axis when viewed from the plus direction of the Z axis. It can also be said that it is a convex part of the protrusion. In the present embodiment, two concave wall portions 282 are arranged between the two spacer convex portions 281 and two concave wall portions 283 are arranged between the two concave wall portions 282. These concave wall portions 282 and 283 have the same amount of dent in the X-axis plus direction, the same amount of protrusion in the X-axis plus direction, and the same width in the Y-axis direction.

The concave wall portions 284 and 285 are concave portions having a substantially C-shape when viewed from the Z-axis direction, in which the surface in the plus direction of the X-axis is recessed in a rectangular shape toward the minus direction of the X-axis, and are extended in the Z-axis direction. Are arranged. Since the concave wall portions 284 and 285 have a surface in the minus direction of the X axis protruding in the minus direction of the X axis, a bulge extending in the Z axis direction extending in a rectangular shape toward the minus direction of the X axis when viewed from the minus direction of the Z axis. It can also be said that it is a convex part of the protrusion. In the present embodiment, two concave wall portions 284 are arranged between each of the two spacer convex portions 281 and each of the two concave wall portions 282, and between the two concave wall portions 283. One concave wall portion 284 is arranged. Two concave wall portions 285 are arranged between each of the two concave wall portions 282 and each of the two concave wall portions 283.

That is, the five concave wall portions of the three concave wall portions 284 and the two concave wall portions 285 have four concave wall portions 282 and two concave wall portions 283 between the two spacer convex portions 281. It is arranged side by side alternately with the concave wall portion in the Y-axis direction. These concave wall portions 284 and 285 have the same amount of dent in the minus direction of the X axis, the same amount of protrusion in the minus direction of the X axis, and the same width in the minus direction of the Y axis. The concave wall portions 284 and 285 have a smaller width in the Y-axis direction than the concave wall portions 282 and 283.

Here, the concave wall portions 283 and 284 are flat plate-shaped wall portions (recesses), whereas the concave wall portions 282 and 285 are provided with protrusions (projections 282b and 285b described later), and the protrusions are provided. It has a concave shape in the direction opposite to the protruding direction of. Hereinafter, the configurations of these concave wall portions 282 and 285 will be described in detail. Since the concave wall portions 282 included in the side wall portions 280 (280a and 280b) all have the same configuration, one concave wall portion 282 will be described in detail below. The same applies to the concave wall portion 285.

As shown in FIG. 7, the concave wall portion 282 has a first wall portion 282a provided with protrusions 282b, a second wall portion 282c, and a deformed portion 282d. The first wall portion 282a is a flat plate-shaped and rectangular wall portion parallel to the YZ plane, which is arranged so as to project from the spacer main body 260 on both sides in the Z-axis direction and faces the power storage element 210 in the X-axis direction (second direction). Is. The protrusion 282b is a protruding portion that protrudes from the first wall portion 282a toward the power storage element 210 in the X-axis direction (second direction). That is, the portion of the first wall portion 282a on which the protrusion 282b is formed is connected to the spacer main body 260 and protrudes from the spacer main body 260 in the Z-axis direction (first direction).

The protrusion 282b is a rib protruding from the central portion of the first wall portion 282a in the Y-axis direction in the minus direction of the X-axis, and extends from the end portion of the first wall portion 282a to the main surface 260a of the spacer main body 260a in the Z-axis direction. It is extended and arranged. In the present embodiment, the protrusion 282b has a length shorter in the Z-axis direction from the first wall portion 282a in the minus direction of the X-axis, and an edge in the plus direction of the Z-axis toward the minus direction of the X-axis. It has a shape inclined in the minus direction of the Z axis.

The arrangement position of the protrusion 282b is not particularly limited, and for example, the protrusion 282b may be arranged at the end portion of the first wall portion 282a in the Y-axis direction, or at the end portion or the central portion in the Z-axis direction. It may be arranged. The shape and number of the protrusions 282b are not particularly limited, and the length in the Z-axis direction becomes longer toward the minus direction of the X-axis, or the protrusions have the same length in the Z-axis direction over the X-axis direction. A plurality of protrusions 282b may be arranged side by side in the Y-axis direction or the Z-axis direction. In the present embodiment, the protrusion 282b is also arranged at the rounded portion of the boundary between the first wall portion 282a and the spacer main body 260, but the protrusion 282b is easily crushed on the rounded portion. 282b may not be arranged.

Like the first wall portion 282a, the second wall portion 282c is arranged so as to project from the spacer main body 260 on both sides in the Z-axis direction, and is flat and rectangular parallel to the YZ plane and faces the power storage element 210 in the X-axis direction. It is a wall part of the shape. The second wall portion 282c is arranged at a position adjacent to the first wall portion 282a in the Y-axis direction (third direction). Specifically, a pair of second wall portions 282c are arranged at positions sandwiching the first wall portion 282a in the Y-axis direction (third direction).

Here, the first wall portion 282a is thinner in the X-axis direction (second direction) than the second wall portion 282c. Specifically, the surface of the first wall portion 282a opposite to the protrusion 282b side of the second wall portion 282c is arranged on the protrusion 282b side. That is, the first wall portion 282a and the second wall portion 282c are arranged at the same position in the X-axis direction on the surface in the minus direction of the X axis, and the first wall portion 282a is arranged on the surface in the plus direction on the X axis. It is arranged in the minus direction of the X-axis with respect to the second wall portion 282c. In other words, the concave wall portion 282 has a shape in which the surface in the plus direction of the X axis is recessed in the minus direction of the X axis at the position of the first wall portion 282a.

The deformed portion 282d is arranged between the first wall portion 282a and the second wall portion 282c, and is a portion that enables a larger deformation of the first wall portion 282a with respect to the second wall portion 282c than other adjacent portions. be. A pair of deformed portions 282d are arranged between the first wall portion 282a and the pair of second wall portions 282c. In the present embodiment, the deformed portion 282d is a penetrating portion formed by penetrating a portion between the first wall portion 282a and the second wall portion 282c in the X-axis direction (second direction). Specifically, in the deformed portion 282d, the portion of the concave wall portion 282 between the first wall portion 282a and the second wall portion 282c is cut out from the end edge in the Z-axis positive direction toward the Z-axis negative direction. In addition, it is a long notch (slit) extending in the Z-axis direction. In the present embodiment, the deformed portion 282d extends to the rounded portion of the boundary between the first wall portion 282a and the spacer main body 260, but may not extend to the rounded portion, and the rounded portion may not extend to the rounded portion. It may extend beyond the portion.

Further, the deformed portion 282d is not limited to the notch (slit), and may be, for example, a through hole extending in the Z-axis direction or a through portion such as a plurality of through holes arranged in the Z-axis direction. Alternatively, the deformed portion 282d may be a thin portion having a thickness thinner in the X-axis direction (second direction) than the first wall portion 282a and the second wall portion 282c, instead of the penetrating portion. In this case, the deformed portion 282d may be a flat plate-shaped thin-walled portion, a bellows-shaped thin-walled portion, or the like. Further, the deformed portion 282d may have both the penetrating portion and the thin-walled portion. As described above, the deformed portion 282d may have at least one of a penetrating portion and a thin-walled portion.

Next, the configuration of the concave wall portion 285 will be described in detail. The concave wall portion 285 has a first wall portion 285a provided with a protrusion 285b, a second wall portion 285c, and a deformed portion 285d. The first wall portion 285a is a flat plate-shaped and rectangular wall portion parallel to the YZ plane, which is arranged so as to project from the spacer body 260 on both sides in the Z-axis direction and faces the power storage element 210 in the X-axis direction (second direction). Is. The protrusion 285b is a protruding portion that protrudes from the first wall portion 285a toward the side opposite to the power storage element 210 in the X-axis direction (second direction). That is, the portion of the first wall portion 285a on which the protrusion 285b is formed is connected to the spacer main body 260 and protrudes from the spacer main body 260 in the Z-axis direction (first direction).

The protrusion 285b is a rib that protrudes from the central portion of the first wall portion 285a in the Y-axis direction in the plus direction of the X-axis, and is arranged so as to extend in the Z-axis direction. In the present embodiment, the protrusion 285b is a trapezoidal protrusion seen from the X-axis direction in which the length in the Z-axis direction becomes shorter toward the X-axis plus direction from the first wall portion 285a, and the two protrusions 285b. Are arranged side by side in the Z-axis direction. The two protrusions 285b may be formed as one protrusion by extending and connecting them in the Z-axis direction. Further, the arrangement position, shape and number of the protrusions 285b are not particularly limited, and various modifications similar to the above-mentioned protrusions 282b are possible.

Like the second wall portion 282c described above, the second wall portion 285c is arranged in a position adjacent to the first wall portion 285a in the Y-axis direction (third direction), and has a flat plate shape and a rectangle parallel to the YZ plane. It is a wall part of the shape. Specifically, a pair of second wall portions 285c are arranged at positions sandwiching the first wall portion 285a in the Y-axis direction (third direction). The thickness of the first wall portion 285a and the second wall portion 285c is the same in the X-axis direction (second direction).

The deformed portion 285d is arranged between the first wall portion 285a and the second wall portion 285c, and is a portion that enables a larger deformation of the first wall portion 285a with respect to the second wall portion 285c than other adjacent portions. be. A pair of deformed portions 285d are arranged between the first wall portion 285a and the pair of second wall portions 285c. In the present embodiment, the deformed portion 285d is a penetrating portion (notch) formed by penetrating a portion between the first wall portion 285a and the second wall portion 285c in the X-axis direction (second direction). However, various deformations (through holes, thin-walled parts, etc.) similar to those of the above-mentioned deformed portion 282d are possible.

As shown in FIGS. 6 and 8, the rear wall portion 290 is a flat plate-shaped wall portion that protrudes from the edge of the spacer body 260 in the plus direction in the Y-axis direction to both sides in the Z-axis direction, and is a storage element 210 in the Y-axis direction. Facing and extending in the X-axis direction. Specifically, the rear wall portion 290 has the Z-axis direction of the Y-axis plus direction surface (bottom surface) of the container body 210a1 of the storage element 210 for each storage element 210 arranged on both sides in the Z-axis direction of the spacer 221. It is arranged so as to cover about half of the above.

The rear wall portion 290 has two flat wall portions 291 at both ends in the X-axis direction. The flat wall portion 291 is not a wall portion that is recessed or protrudes like the concave wall portion 282 or the like, but is a flat wall portion. The rear wall portion 290 has a first wall portion 291a provided with protrusions 291b, a second wall portion 291c, and a deformed portion 291d. The first wall portion 291a is a flat plate-shaped and rectangular wall portion parallel to the XZ plane, which is arranged so as to project from the spacer main body 260 on both sides in the Z-axis direction and faces the power storage element 210 in the Y-axis direction. The protrusion 291b is a protruding portion that protrudes from the first wall portion 291a toward the power storage element 210 in the Y-axis direction. That is, the portion of the first wall portion 291a on which the protrusion 291b is formed is connected to the spacer main body 260 and protrudes from the spacer main body 260 in the Z-axis direction.

The protrusions 291b are ribs that project from both ends of the first wall portion 291a in the X-axis direction in the minus direction of the Y-axis, and are arranged so as to extend in the Z-axis direction. Since the protrusion 291b has the same configuration as the protrusion 282b described above, detailed description thereof will be omitted. The second wall portion 291c is a flat plate-shaped and rectangular wall portion parallel to the XZ plane, which is arranged at a position adjacent to the first wall portion 291a in the X-axis direction. A pair of second wall portions 291c are arranged at positions sandwiching the first wall portion 291a in the X-axis direction. Since the second wall portion 291c has the same configuration as the above-mentioned second wall portion 282c, detailed description thereof will be omitted. The deformed portion 291d is arranged between the first wall portion 291a and the second wall portion 291c, and is a portion that enables a larger deformation of the first wall portion 291a with respect to the second wall portion 291c than other adjacent portions. be. A pair of deformed portions 291d are arranged between the first wall portion 291a and the pair of second wall portions 291c. Since the deformed portion 291d has the same configuration as the deformed portion 282d described above, detailed description thereof will be omitted.

Although the configuration of the spacer 221 has been described above, the spacer 222 also has the same configuration as the spacer 221. That is, for all spacers 222, the spacer 221 has a front wall portion 270, a pair of side wall portions 280 (280a and 280b), and a wall portion having the same configuration as half of the rear wall portion 290 in the Z-axis direction.

[5 Explanation of the configuration of the side member 240]
Next, the configuration of the side member 240 will be described in detail. Since all the side members 240 included in the power storage unit 200 have the same configuration, one side member 240 will be illustrated and described below. FIG. 9 is a perspective view showing the configuration of the side member 240 according to the present embodiment. Specifically, FIG. 9 shows an enlarged view of the side member 240 shown in FIG.

As shown in FIG. 9, the side member 240 has a side convex portion 241 in which the above-mentioned openings 243 and 244 are formed, and a side concave portion 242. In the present embodiment, the five side protrusions 241 and the four side recesses 242 are arranged alternately side by side in the Y-axis direction.

The side convex portion 241 is a protruding portion of the side member 240 that protrudes in the X-axis direction and extends in the Z-axis direction. In the present embodiment, the side convex portion 241 projects in a rectangular shape on both sides of the side member 240 in the X-axis direction, and is a rectangular parallelepiped (rectangular parallelepiped shape) extending from one end to the other end in the Z-axis direction of the side member 240. ) Part. Here, the side convex portion 241 in which the opening 243 is formed is referred to as a side convex portion 241a, and the side convex portion 241 in which the opening 244 is formed is referred to as a side convex portion 241b. That is, the three side convex portions 241a and the two side convex portions 241b are arranged alternately side by side in the Y-axis direction. Then, two openings 243 extending in the Z-axis direction are formed at both ends of the side convex portion 241a in the Z-axis direction, and two openings 244 extending in the Z-axis direction are formed at both ends of the side convex portion 241b in the Z-axis direction. Is formed.

As described above, the side convex portion 241a is formed in the Z-axis direction by inserting the protrusions 230a (231a, 232a) of the pair of end members 230 (231, 232) into the openings 243 on both sides in the Z-axis direction. It is fixed to the pair of end members 230. The side convex portion 241b is fixed to the exterior body 100 in the Z-axis direction by inserting the protruding portion 113 of the exterior body main body 110 of the exterior body 100 into the opening portion 244 in the negative direction of the Z-axis. Regarding the side member 240 on the minus direction side of the X axis, the side convex portion 241b is Z by inserting the protruding portion 321 of the mounting member 320 of the electrical equipment unit 300 into the openings 244 on both sides in the Z axis direction. It is fixed to the electrical equipment unit 300 in the axial direction.

The side recess 242 is a portion of the side member 240 that is recessed in the X-axis direction and extends in the Z-axis direction, and is arranged adjacent to the side convex portion 241 (241a, 241b). In the present embodiment, the side recesses 242 are rectangularly recessed from both sides in the X-axis direction of the side member 240, and are flat and rectangular (flat plate-like and rectangular) extending from one end to the other end in the Z-axis direction of the side member 240. It is a part of the rectangular parallelepiped shape).

[6 Explanation of the positional relationship between the spacer 221 and the power storage element 210 and the side member 240]
Next, the positional relationship between the spacer 221 and the power storage element 210 and the side member 240 will be described in detail. FIG. 10 is a top view showing the positional relationship between the spacer 221 and the power storage element 210 and the side member 240 according to the present embodiment. Specifically, FIG. 10A shows a configuration in which the spacer 221 and the power storage element 210 and the side member 240 are assembled when viewed from the Z-axis plus direction. 10 (b) shows an enlarged view of the concave wall portions 282 and 285 of the side wall portion 280a of the spacer 221 of FIG. 10 (a) and their surroundings.

As shown in FIG. 10, the side wall portions 280 (280a and 280b) of the spacer 221 are arranged on both sides in the X-axis direction of the power storage element 210, and the rear wall portions 290 are arranged in the Y-axis plus direction of the power storage element 210. .. Then, side members 240 are arranged on both sides of the side wall portions 280 (280a and 280b) in the X-axis direction. That is, the side wall portions 280 (280a and 280b) are arranged between the power storage element 210 and the side member 240, and are arranged in a state of being sandwiched between the power storage element 210 and the side member 240.

The spacer convex portion 281 of the side wall portion 280 is arranged outside the end portion of the side member 240 in the Y-axis direction and projects toward the side member 240. The two concave wall portions 282 and the two concave wall portions 283 are inserted into the four side recesses 242 of the side member 240, respectively. The five side convex portions 241 of the side member 240 are inserted into the three concave wall portions 284 and the two concave wall portions 285, respectively. Specifically, the three side convex portions 241a are inserted into the three concave wall portions 284, and the two side convex portions 241b are inserted into the two concave wall portions 285.

Then, the protrusion 282b of the concave wall portion 282 abuts on the power storage element 210, and the protrusion 285b of the concave wall portion 285 abuts on the side convex portion 241b of the side member 240. In the present embodiment, since all the spacers 220 (all the spacers 221 and all the spacers 222) have the same configuration as described above, the protrusions 285b of all the spacers 220 are the sides of the side member 240. It abuts on the convex portion 241b. The protrusion 291b (not shown in FIG. 10) of the flat wall portion 291 of the rear wall portion 290 abuts on the power storage element 210. The protrusion 282b protrudes from the concave wall portion 285 in the minus direction of the X-axis so that the protrusion 282b can come into contact with the power storage element 210. Since the protrusion 285b only needs to be in contact with the side convex portion 241b, the protrusion amount is smaller than that of the protrusion 282b, and the protrusion 285b does not protrude in the X-axis plus direction from the concave wall portion 282. Further, the distance (gap) between the first wall portion 282a and the side recess 242 is larger than the distance between the second wall portion 282c and the side recess 242.

Further, the power storage device 10 includes two sets of power storage elements 210 and a spacer 221 at positions sandwiching the side member 240 in the X-axis direction. That is, the side member 240 is arranged between the side wall portion 280a of the spacer 221 arranged in the Z-axis direction of the power storage element 211 and the side wall portion 280b of the spacer 221 arranged in the Z-axis direction of the power storage element 212. .. The portion of the side member 240 on the X-axis minus direction side and the side wall portion 280a have the above-mentioned configuration, and the portion of the side member 240 on the X-axis plus direction side and the side wall portion 280b are described above. Has the same configuration.

[7 Explanation of effect]
As described above, according to the power storage device 10 according to the embodiment of the present invention, the spacer 221 faces the power storage element 210 in the second direction (X-axis direction) and extends in the third direction (Y-axis direction). It has protrusions 282b and 285b protruding in the second direction from the portion 280. Further, the side wall portion 280 of the spacer 221 is provided with the protrusions 282b and 285b, and has concave wall portions 282 and 285 recessed in the direction opposite to the protrusion direction of the protrusions 282b and 285b. As described above, the spacer 221 has a protrusion 282b protruding from the side wall portion 280 toward the power storage element 210, and a protrusion 285b protruding in the direction opposite to the power storage element 210 (toward the side member 240). ing. Therefore, even if there is a gap (rattling) between the side wall portion 280 and the power storage element 210 or the member (side member 240) on the opposite side of the power storage element 210, the protrusions 282b or 285b fill the gap. Can be done. As a result, even if vibration or impact is applied to the power storage device 10, it is possible to suppress the movement of the power storage element 210 or the like in the power storage device 10, so that the internal members of the power storage device 10 are not damaged. It can be suppressed.

Further, when the protrusions 282b and 285b are provided on the spacer 221 and the protrusions 282b and 285b have a short protrusion length, the protrusions 282b and 285b are not sufficiently crushed, and the spacer 221 and the power storage element 210 or the above member (side member 240) are not sufficiently crushed. ) Etc. may be damaged. Therefore, the side wall portion 280 of the spacer 221 is provided with the concave wall portions 282 and 285 recessed in the direction opposite to the protruding direction of the protrusions 282b and 285b, and the concave wall portions 282 and 285 are provided with the protrusions 282b and 285b. As a result, the protrusion length of the protrusions 282b and 285b can be lengthened, so that the protrusions 282b and 285b cannot be sufficiently crushed and the spacer 221 and the power storage element 210 or the above-mentioned member can be prevented from being damaged. Therefore, it is possible to prevent the internal members of the power storage device 10 from being damaged.

Further, when the protrusion 282b is provided on the spacer 221 and the gap between the side wall portion 280 and the power storage element 210 is small or the protrusion 282b is hard, the protrusion 282b is not sufficiently crushed and the spacer 221 or the power storage element 210 is not sufficiently crushed. Etc. may be damaged. Similarly, for the protrusion 285b, if the gap between the side wall portion 280 and the member (side member 240) on the opposite side of the power storage element 210 is small or the protrusion 285b is hard, the protrusion 285b will not be sufficiently crushed. , Spacer 221 or the member concerned may be damaged. Therefore, in the concave wall portions 282 and 285, between the first wall portions 282a and 285a and the second wall portions 282c and 285c provided with the protrusions 282b and 285b, the first wall portion with respect to the second wall portions 282c and 285c. Deformation portions 282d and 285d that enable large deformation of 282a and 285a are arranged. As a result, when the protrusions 282b and 285b are not sufficiently crushed, the deformed portions 282d and 285d deform the first wall portions 282a and 285a with respect to the second wall portions 282c and 285c, so that the spacer 221 and the power storage element are deformed. It is possible to prevent the 210 or the member from being damaged. Therefore, it is possible to prevent the internal members of the power storage device 10 from being damaged.

Further, in the concave wall portion 282, the first wall portion 282a is thinner than the second wall portion 282c, so that even if the first wall portion 282a is provided with the protrusion 282b, the first wall portion 282a is a protrusion. It is possible to suppress the protrusion on the opposite side of 282b. As a result, even in a configuration in which the concave wall portion 282 is provided on the side wall portion 280 of the spacer 221 to suppress damage to the internal members of the power storage device 10, the concave wall portion 282 is prevented from protruding to the side opposite to the protrusion 282b. Therefore, it is possible to save space.

Further, in the concave wall portion 282, the surface (for example, the outer surface) opposite to the protrusion 282b side of the first wall portion 282a provided with the protrusion 282b is the projection 282b side (for example, the inner surface) with respect to the second wall portion 282c. Is located in. Therefore, even if the first wall portion 282a is deformed to the side opposite to the protrusion 282b (for example, outside), it is possible to prevent the first wall portion 282a from protruding to the side opposite to the protrusion 282b. As a result, even in a configuration in which the concave wall portion 282 is provided on the side wall portion 280 of the spacer 221 to suppress damage to the internal members of the power storage device 10, the concave wall portion 282 is prevented from protruding to the side opposite to the protrusion 282b. Therefore, it is possible to save space.

Further, the side member 240 facing the spacer 221 has a side concave portion 242 into which the concave wall portions 282 and 283 of the spacer 221 are inserted, and a side convex portion 241 inserted into the concave wall portions 284 and 285. .. Therefore, the spacer 221 can be positioned with respect to the side member 240 by utilizing the concave wall portion 282, 283, 284 or 285. As a result, even if vibration or impact is applied to the power storage device 10, it is possible to suppress the movement of the spacer 221 and the power storage element 210 in the power storage device 10, so that the internal members of the power storage device 10 are damaged. Can be suppressed.

Further, the portion of the first wall portion 282a on which the protrusion 282b is formed is connected to the spacer main body 260 and protrudes from the spacer main body 260, so that the portion is not connected to the spacer main body 260. , It is possible to suppress deformation with respect to the second wall portion 282c. As a result, it is possible to prevent the portion from being deformed too much with respect to the second wall portion 282c, causing damage to the spacer 221 and creating a gap between the spacer 221 and the power storage element 210. .. Similarly, with respect to the protrusion 285b, it is possible to prevent the spacer 221 from being damaged or a gap from being formed between the spacer 221 and the member (side member 240) on the opposite side of the power storage element 210. .. Therefore, it is possible to prevent the internal members of the power storage device 10 from being damaged. The same can be said for the flat wall portion 291.

Further, at least a penetrating portion through which the portion between the first wall portion 282a and the second wall portion 282c penetrates the deformed portion 282d, and a thin-walled portion thinner than the first wall portion 282a and the second wall portion 282c. With the configuration having one of them, the deformed portion 282d can be easily formed. As a result, it is possible to easily prevent the internal members of the power storage device 10 from being damaged. The same can be said for the deformed portion 285d. The same can be said for the flat wall portion 291.

Further, since the spacer 221 has a pair of deformed portions 282d between the first wall portion 282a and the pair of second wall portions 282c, the first wall portion 282a is deformed with respect to the second wall portion 282c. It is easy to deform and can be deformed in a well-balanced manner. As a result, it is possible to further suppress damage to the internal members of the power storage device 10. The same can be said for the deformed portion 285d. The same can be said for the flat wall portion 291.

Further, since the protrusion 285b protrudes toward the side opposite to the power storage element 210, there is a gap (rattling) between the first wall portion 285a and the member (side member 240) on the side opposite to the power storage element 210. Even if it occurs, the protrusion 285b can fill the gap. As a result, even if vibration or impact is applied to the power storage device 10, it is possible to suppress the movement of the power storage element 210 or the like in the power storage device 10. Further, even if the protrusion 285b is pressed against the member (side member 240), the first wall portion 285a is deformed with respect to the second wall portion 285c by the deforming portion 285d, so that the spacer 221 or the member is damaged. Can be suppressed. Therefore, it is possible to prevent the internal members of the power storage device 10 from being damaged.

[8 Explanation of modified example]
Although the power storage device 10 according to the embodiment of the present invention (including a modification thereof) has been described above, the present invention is not limited to this embodiment. That is, the embodiments disclosed this time are exemplary and not restrictive in all respects, and the scope of the present invention includes all modifications within the meaning and scope equivalent to the scope of claims. Is done.

For example, in the above embodiment, it is assumed that a plurality of spacers 220 are arranged, but only one spacer 220 may be arranged. That is, only one spacer 221 may be arranged, only one spacer 222 may be arranged, or one of the spacer 221 and the spacer 222 may not be arranged. good. Even when the spacer 221 is not arranged, the spacer 222 can have the same function as the spacer 221 by having the same wall structure as the spacer 221 described above.

In the above embodiment, the spacer 221 has a pair of second wall portions 282c at positions sandwiching the first wall portion 282a, and a pair of deformed portions between the first wall portion 282a and the pair of second wall portions 282c. It was decided to have 282d. However, the spacer 221 has the second wall portion 282c only on one side of the first wall portion 282a, and has only one deformed portion 282d between the first wall portion 282a and the second wall portion 282c. It may not be. The same applies to the concave wall portion 285 and the flat wall portion 291.

In the above embodiment, the concave wall portion 282 of the side wall portion 280 of the spacer 221 has a first wall portion 282a thinner than the second wall portion 282c. However, the first wall portion 282a may have the same thickness as the second wall portion 282c, or the second wall portion 282c may be thicker.

In the above embodiment, in the concave wall portion 282 of the side wall portion 280 of the spacer 221, the first wall portion 282a is arranged on the projection 282b side with the surface opposite to the projection 282b side of the second wall portion 282c. I decided to do it. However, the surface of the first wall portion 282a on the projection 282b side may be arranged on the side opposite to the projection 282b side of the second wall portion 282c.

In the above embodiment, the concave wall portion 285 of the side wall portion 280 of the spacer 221 has a first wall portion 285a having the same thickness as the second wall portion 285c. However, the first wall portion 285a may be thinner or thicker than the second wall portion 285c. Further, the surface of the first wall portion 285a on the side opposite to the protrusion 285b side may be arranged on the protrusion 285b side of the second wall portion 285c, or the protrusion may be arranged on the protrusion 285b side of the second wall portion 285c. The surface on the 285b side may be arranged on the side opposite to the protrusion 285b side. The same applies to the flat wall portion 291.

In the above embodiment, the flat wall portion 291 is a flat wall portion, but it may be a concave wall portion as in the concave wall portions 282, 285 and the like. Alternatively, the concave wall portion such as the concave wall portion 282, 285 may be a flat wall portion instead of a concave wall portion.

In the above embodiment, the concave wall portions 284 and 285 have the same shape, and the width between the pair of wall portions facing each other in the Y-axis direction in the concave portion is the same. However, the concave wall portions 284 and 285 may have different widths between the pair of wall portions. For example, in the concave wall portions 284 and 285, the width between the pair of wall portions gradually increases from the concave wall portion at the end in the minus direction of the Y axis toward the concave wall portion at the end in the plus direction of the Y axis. Or it may be gradually reduced. As a result, a gap can be formed between the concave wall portions 284 and 285 and the side convex portion 241 of the side member 240, so that it is possible to absorb the positional deviation due to dimensional tolerances during manufacturing.

In the above embodiment, the side member 240 has side protrusions 241 protruding from both sides in the X-axis direction. However, the side convex portion 241 may protrude only to one side in the X-axis direction, and the side member 240 may be a flat plate-shaped member having no side convex portion 241. That is, the side member 240 does not have at least one of the side recesses 242 into which the concave wall portions 282 and 283 of the spacer 221 are inserted and the side convex portions 241 inserted into the concave wall portions 284 and 285. good.

In the above embodiment, the power storage unit 200 has two power storage elements 210 (211 and 212) arranged in the X-axis direction. However, the power storage unit 200 may have three or more power storage elements 210 arranged in the X-axis direction, or may have only one power storage element 210 in the X-axis direction.

In the above embodiment, any one of the plurality of spacers 221 may not have the above-mentioned configuration, and even if any one of the plurality of side members 240 does not have the above-mentioned configuration. Alternatively, any one of the plurality of power storage elements 210 may not have the above configuration.

In the above embodiment, the power storage device 10 does not need to include all the above-mentioned components. For example, the power storage device 10 may not be provided with a component (member or part) that does not contribute to the above-mentioned effect or can exert the above-mentioned effect without it.

Also included in the scope of the present invention is a form constructed by arbitrarily combining the components included in the above-described embodiment and its modifications.

The present invention can be realized not only as a power storage device 10 but also as a spacer 220.

The present invention can be applied to a power storage device including a power storage element such as a lithium ion secondary battery.

10 Power storage device 100 Exterior body 112, 280, 280a, 280b Side wall 130 External terminal 200 Power storage unit 210, 211, 212 Power storage element 210a Container 210b Electrode terminal 210e Current collector 210f Electrode body 220, 222, 222 Spacer 230, 231 232 End member 240 Side member 241, 241a, 241b Side convex part 242 Side concave part 250 Bus bar 260 Spacer body 270 Front wall part 281 Spacer convex part 282, 283, 284, 285 Concave wall part 282a, 285a, 291a First wall part 282b , 285b, 291b Protrusions 282c, 285c, 291c Second wall part 282d, 285d, 291d Deformation part 290 Rear wall part 291 Flat wall part 300 Electrical equipment unit

Claims (5)

A power storage device including a power storage element and a spacer arranged side by side in the first direction.
The spacer is
A wall portion facing the power storage element in the second direction intersecting the first direction and extending in the third direction intersecting the first direction and the second direction.
It has a protrusion that protrudes from the wall portion in the second direction, and has.
The wall portion is a power storage device provided with the protrusion and having a concave wall portion recessed in a direction opposite to the protruding direction of the protrusion. The concave wall portion
The first wall portion provided with the protrusion and
The second wall portion arranged adjacent to the first wall portion in the third direction, and the second wall portion.
A claim having a deformed portion disposed between the first wall portion and the second wall portion, which allows a larger deformation of the first wall portion with respect to the second wall portion than other adjacent portions. Item 1. The power storage device according to item 1. The concave wall portion
The first wall portion provided with the protrusion and
It has a second wall portion arranged at a position adjacent to the first wall portion in the third direction, and has.
The power storage device according to claim 1 or 2, wherein the first wall portion is thinner than the second wall portion in the second direction. The concave wall portion
The first wall portion provided with the protrusion and
It has a second wall portion arranged at a position adjacent to the first wall portion in the third direction, and has.
The power storage device according to any one of claims 1 to 3, wherein the first wall portion has a surface opposite to the protrusion side on the protrusion side of the second wall portion. Moreover,
A side member facing the spacer in the second direction is provided.
The power storage device according to any one of claims 1 to 4, wherein the side member has a concave portion into which the concave wall portion is inserted or a convex portion inserted into the concave wall portion.

Images