JP2022029069A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device capable of suppressing damage to a spacer.
SOLUTION: The power storage device 10 includes a power storage element 210 and a spacer 221 arranged in an array direction, and the spacer 221 is a planar first surface 260a which is one surface in the arrangement direction and the other surface. The spacer main body 260 having a planar second surface 260b, the first convex portions 261, 262 and 263 arranged on the first surface 260a and extending along the first surface 260a, and the second surface 260b. The second convex portions 264, 265 and 266 arranged in the second convex portions 264, 265 and 266 arranged at positions adjacent to the first convex portions 261, 262 and 263 when viewed from the arrangement direction. , Have.
[Selection diagram] FIG. 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 having a power storage element and a spacer arranged in the arrangement direction and having a convex portion formed on a surface of the spacer in the arrangement direction. For example, Patent Document 1 includes a plurality of cells (storage elements) and spacers arranged in the arrangement direction, and has a first convex portion and a second convex portion (convex portion) on the surface of the spacer in the arrangement direction. The assembled battery (power storage device) in which the is formed is disclosed.

Japanese Unexamined Patent Publication No. 2019-128991

In a configuration in which a convex portion is formed on the spacer as in the conventional power storage device, stress is concentrated on the convex portion due to the convex portion being compressed by the power storage element, and the spacer may be damaged. .. In particular, when a convex portion is formed on the back side of the convex portion of the spacer, stress is concentrated on the convex portions on both sides of the spacer, and when the convex portion of the spacer is long, a long convex portion is formed. Stress is concentrated over the part. In such a case, there is an increased risk that the spacer will 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 a spacer.

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 in the arrangement direction, and the spacer is one surface in the arrangement direction. A spacer body having a planar first surface and a planar second surface which is the other surface, and a first convex portion arranged on the first surface and extended along the first surface. It has a second convex portion arranged on the second surface, and a second convex portion arranged at a position adjacent to the first convex portion when viewed from the arrangement direction.

According to this, in the power storage device, the power storage element and the spacer arranged in the arrangement direction are arranged on one planar first surface and extend along the first surface, and the other It is arranged on a planar second surface, and has a second convex portion adjacent to the first convex portion when viewed from the arrangement direction. Here, if a long first convex portion is arranged on the first surface of the spacer, stress is concentrated over the long first convex portion, so that the spacer may be damaged. Further, if the second convex portion is arranged on the second surface of the spacer at a position overlapping the first convex portion when viewed from the arrangement direction, stress is concentrated on the first convex portion and the second convex portion. There is an increased risk that the spacer will be damaged. Therefore, on the second surface of the spacer, the second convex portion is arranged at a position adjacent to the first convex portion (position not overlapping with the first convex portion) when viewed from the arrangement direction. As a result, the stress applied to the first convex portion and the second convex portion can be dispersed, and the concentration of the stress on the first convex portion and the second convex portion can be suppressed. Therefore, damage to the spacer can be suppressed.

Further, the first convex portion and the second convex portion may be extended and arranged in the same direction.

According to this, in the spacer, the first convex portion of the first surface and the second convex portion of the second surface are extended in the same direction, so that the first convex portion and the second convex portion arranged at adjacent positions are arranged. Stress is easily dispersed to the convex parts. As a result, it is possible to suppress the concentration of stress on the first convex portion and the second convex portion, so that damage to the spacer can be suppressed.

Further, the spacer may have two first convex portions, and the second convex portion may be arranged between the two first convex portions when viewed from the arrangement direction.

According to this, in the spacer, the second convex portion of the second surface is arranged between the two first convex portions of the first surface when viewed from the above-mentioned arrangement direction, whereby the first convex portion and the second convex portion are arranged. Stress is easily dispersed to the convex part. As a result, it is possible to suppress the concentration of stress on the first convex portion and the second convex portion, so that damage to the spacer can be suppressed.

Further, the spacer has a plurality of the first convex portions and a plurality of the second convex portions, and the plurality of the first convex portions and the plurality of the second convex portions are from the arrangement direction. You may look at it and arrange it alternately.

According to this, in the spacer, the plurality of first convex portions on the first surface and the plurality of second convex portions on the second surface are alternately arranged when viewed from the above-mentioned arrangement direction, whereby the first convex portions are arranged. Stress is easily dispersed between the and the second convex portion. As a result, it is possible to suppress the concentration of stress on the first convex portion and the second convex portion, so that damage to the spacer can be suppressed.

Further, the spacer has a wall portion facing the power storage element in the extending direction of at least one of the first convex portion and the second convex portion, and the at least one convex portion is the said. It may be arranged apart from the wall portion.

According to this, in the spacer, at least one convex portion of the first convex portion of the first surface and the second convex portion of the second surface is arranged apart from the wall portion facing the power storage element. The at least one convex portion is easily deformed. As a result, it is possible to suppress the concentration of stress on the at least one convex portion, and thus it is possible to suppress damage to the spacer.

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, damage to the spacer can be suppressed.

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 top view and the bottom view which show the structure of the spacer which concerns on embodiment. It is sectional drawing which shows the structure of the spacer 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 is screwed into the opening portion 244 of the side member 240 in a state of penetrating the end member 230.

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, a self-tap bolt (tapping bolt), or the like, and is screwed into the opening 243 of the side member 240.

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 a top view and a bottom view showing the configuration of the spacer 221 according to the present embodiment. Specifically, FIG. 7A is a top view showing the configuration of the spacer 221 shown in FIG. 6 when viewed from the Z-axis plus direction. FIG. 7B is a bottom view showing the configuration of the spacer 221 shown in FIG. 6 when viewed from the negative direction on the Z axis. FIG. 8 is a cross-sectional view showing the configuration of the spacer 221 according to the present embodiment. Specifically, FIG. 8A shows a cross section when the spacer 221 shown in FIG. 7 is cut along a plane parallel to the YZ plane through the VIII-VIII line, and is shown in FIG. 8B and FIG. (C) shows an enlarged structure in the broken line of FIG. 8 (a).

[Approximate configuration of 4.1 spacer 221]
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.

The spacer main body 260 has a planar first surface 260a which is one surface in the Z-axis direction (arrangement direction) and a planar second surface 260b which is the other surface. That is, the first surface 260a is the main surface of the spacer body 260 in the Z-axis plus direction, and the second surface 260b is the main surface of the spacer body 260 in the Z-axis minus direction. The first convex portions 261 and 262 and 263 are arranged on the first surface 260a, and the second convex portions 264, 265 and 266 are arranged on the second surface 260b. A detailed description of the configurations of the first convex portions 261 and 262 and 263 and the second convex portions 264, 265 and 266 will be described later.

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.

The concave wall portions 282 and 283 are U-shaped (inverted C-shaped) recesses 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 arranged so as to extend in the 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.

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. As a result, the surface of the concave wall portions 284 and 285 in the minus direction of the X-axis abuts on the short side surface of the container 210a of the power storage element 210. 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.

The concave wall portions 282 and 283 are inserted into the side concave portions 242 (see FIG. 4) of the side member 240, respectively, and the side convex portions 241 (see FIG. 4) of the side member 240 are inserted into the concave wall portions 284 and 285, respectively. Will be done. The side convex portion 241 is a convex portion that protrudes in a rectangular shape on both sides of the side member 240 in the X-axis direction and extends from one end to the other end of the side member 240 in the Z-axis direction. 244 is formed. The side recess 242 is a recess that is rectangularly recessed from both sides of the side member 240 in the X-axis direction and extends from one end to the other end of the side member 240 in the Z-axis direction.

The rear wall portion 290 is a flat plate-shaped wall portion that protrudes from the end edge of the spacer body 260 in the Y-axis positive direction to 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 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 of the spacer 221 in the Z-axis direction. It is arranged so as to cover about half of the above.

[4.2 Explanation of the configuration of the first convex portion and the second convex portion of the spacer main body 260]
Next, the configurations of the first convex portions 261 and 262 and 263 of the spacer main body 260 and the second convex portions 264, 265 and 266 will be described in detail. The first convex portions 261, 262 and 263 are convex portions formed by projecting from the first surface 260a in the plus direction of the Z axis and extending in the X-axis direction along the first surface 260a. The second convex portions 264, 265 and 266 are convex portions formed by projecting from the second surface 260b in the minus direction of the Z axis and extending in the X-axis direction along the second surface 260b.

The first convex portion 261 is a rib extending linearly from one end portion to the other end portion of the first surface 260a in the X-axis direction at the end portion of the first surface 260a in the Y-axis direction. One first convex portion 261 is arranged at each of both ends of the first surface 260a in the Y-axis direction. In the present embodiment, the first convex portion 261 has a rectangular cross-sectional shape when cut on a YZ plane, but the cross-sectional shape is any shape such as a triangular shape, a semicircular shape, a semi-elliptical shape, or the like. It may be. Further, the first convex portion 261 does not extend to the end edge of the first surface 260a in the X-axis direction. That is, the first convex portion 261 does not reach the side wall portion 280 (280a and 280b), but is arranged apart from the side wall portion 280 (280a and 280b). Specifically, the first convex portion 261 is arranged in the X-axis direction of the concave wall portions 284 at both ends of the side wall portions 280 (280a and 280b) in the Y-axis direction, and extends toward the concave wall portions 284. However, it is arranged apart from the concave wall portion 284.

The second convex portion 264 is a rib extending linearly from one end portion to the other end portion of the second surface 260b in the X-axis direction at the end portion of the second surface 260b in the Y-axis direction. Two second convex portions 264 are arranged on each of both ends of the second surface 260b in the Y-axis direction. In the present embodiment, the second convex portion 264 has a rectangular cross-sectional shape when cut in the YZ plane, but the cross-sectional shape is any shape such as a triangular shape, a semicircular shape, a semi-elliptical shape, or the like. It may be. The second convex portion 264 has the same length as the first convex portion 261 in the X-axis direction, but may have a different length in the X-axis direction. Further, the second convex portion 264 does not extend to the end edge of the second surface 260b in the X-axis direction. That is, the second convex portion 264 does not reach the side wall portion 280 (280a and 280b), but is arranged apart from the side wall portion 280 (280a and 280b). Specifically, the second convex portion 264 is arranged in the X-axis direction of the concave wall portions 284 at both ends of the side wall portions 280 (280a and 280b) in the Y-axis direction, and extends toward the concave wall portions 284. However, it is arranged apart from the concave wall portion 284.

The first convex portion 262 is a rib extending linearly in the X-axis direction at the central portion of the first surface 260a in the Y-axis direction, and is first on each of both ends of the first surface 260a in the X-axis direction. The convex portions 262 are arranged one by one. The cross-sectional shape of the first convex portion 262 is the same as that of the first convex portion 261. The first convex portion 262, like the first convex portion 261, does not extend to the end edge of the first surface 260a in the X-axis direction, and is arranged apart from the side wall portions 280 (280a and 280b). Has been done. Specifically, the first convex portion 262 is arranged in the X-axis direction of the concave wall portion 284 at the center of the side wall portions 280 (280a and 280b) in the Y-axis direction, and extends toward the concave wall portion 284. However, it is arranged apart from the concave wall portion 284.

The second convex portion 265 is a rib extending linearly in the X-axis direction at the central portion of the second surface 260b in the Y-axis direction, and is a second rib at both ends of the second surface 260b in the X-axis direction. Two convex portions 265 are arranged. The cross-sectional shape of the second convex portion 265 is the same as that of the second convex portion 264. The second convex portion 265 has the same length as the first convex portion 262 in the X-axis direction, but may have a different length in the X-axis direction. Like the second convex portion 264, the second convex portion 265 does not extend to the end edge of the second surface 260b in the X-axis direction, and is arranged apart from the side wall portions 280 (280a and 280b). Has been done. Specifically, the second convex portion 265 is arranged in the X-axis direction of the concave wall portion 284 at the center of the side wall portions 280 (280a and 280b) in the Y-axis direction, and extends toward the concave wall portion 284. However, it is arranged apart from the concave wall portion 284.

The first convex portion 263 is a rib extending linearly in the X-axis direction on both sides of the first convex portion 262 in the Y-axis direction, and the first convex portion 263 is located between the first convex portions 261 and 262, respectively. Two parts 263 are arranged. The cross-sectional shape of the first convex portion 263 is the same as that of the first convex portion 262. Like the first convex portion 262, the first convex portion 263 does not extend to the end edge of the first surface 260a in the X-axis direction, and is arranged apart from the side wall portions 280 (280a and 280b). Has been done. Specifically, the first convex portion 263 is arranged in the X-axis direction of the concave wall portion 285 of the side wall portions 280 (280a and 280b) and extends toward the concave wall portion 285, but the concave wall portion. It is arranged apart from 285.

The second convex portion 266 is a rib extending linearly in the X-axis direction on both sides of the second convex portion 265 in the Y-axis direction, and is a second convex portion between the second convex portions 264 and 265, respectively. The portions 266 are arranged one by one. The cross-sectional shape of the second convex portion 266 is the same as that of the second convex portion 265. The second convex portion 266 has the same length as the first convex portion 263 in the X-axis direction, but may have a different length in the X-axis direction. Like the second convex portion 265, the second convex portion 266 does not extend to the end edge of the second surface 260b in the X-axis direction, and is arranged apart from the side wall portions 280 (280a and 280b). Has been done. Specifically, the second convex portion 266 is arranged in the X-axis direction of the concave wall portion 285 of the side wall portions 280 (280a and 280b) and extends toward the concave wall portion 285, but the concave wall portion. It is arranged apart from 285.

As described above, the first convex portions 261, 262 and 263, and the second convex portions 264, 265 and 266 are arranged so as to extend in the same direction (X-axis direction). The spacer 221 is a side wall portion 280 (280a) which is a wall portion facing the power storage element 210 in the extending direction (X-axis direction) of at least one of the convex portions such as the first convex portion 261 and the like and the second convex portion 264 and the like. And 280b). Then, at least one of the convex portions (in the present embodiment, all the convex portions) such as the first convex portion 261 and the like and the second convex portion 264 and the like are separated from the wall portion (side wall portion 280 (280a and 280b)). And are arranged. Specifically, these first convex portions 261 and the like and the second convex portions 264 and the like are concave at positions adjacent to the concave wall portions 284 and 285, which are the wall portions in the side wall portion 280 that come into contact with the power storage element 210. It is arranged apart from the wall portions 284 and 285.

Further, when viewed from the Z-axis direction (arrangement direction), the second convex portion 264 is arranged at a position adjacent to the first convex portion 261 and the second convex portion 265 is arranged at a position adjacent to the first convex portion 262. , The second convex portion 266 is arranged at a position adjacent to the first convex portion 263. In other words, the second convex portions 264, 265 and 266 are arranged at positions that do not overlap with the first convex portions 261, 262 and 263 (positions that do not face each other in the Z-axis direction). In the present embodiment, when viewed from the Z-axis direction (arrangement direction), one first convex portion 261 is arranged between the two second convex portions 264, and one is arranged between the two second convex portions 265. The first convex portion 262 is arranged, and one second convex portion 266 is arranged between the two first convex portions 263. As a result, the plurality of first convex portions 261, 262 and 263 and the plurality of second convex portions 264, 265 and 266 are alternately arranged when viewed from the Z-axis direction (arrangement direction). .. Although the enlarged view of the cross-sectional shape of the first convex portion 262 and the second convex portion 265 is not shown in FIG. 8, the first convex portion 261 and the second convex portion 264 shown in FIG. 8 (b) are shown. It has a shape similar to the cross-sectional shape.

[5 Explanation of effect]
As described above, according to the power storage device 10 according to the embodiment of the present invention, the spacer 221 is arranged on the first surface 260a and extends along the first surface 260a, the first convex portions 261 and 262. And 263 (hereinafter, also referred to as a first convex portion 261 and the like). Further, the spacer 221 is arranged on the second surface 260b, and is adjacent to the first convex portion 261 and the like when viewed from the arrangement direction (Z-axis direction). Etc.). Here, if a long first convex portion 261 or the like is arranged on the first surface 260a of the spacer 221, stress is concentrated over the long first convex portion 261 or the like, so that the spacer 221 is damaged. There is a risk of doing so. Further, if the second convex portion 264 or the like is arranged at a position overlapping the first convex portion 261 or the like when viewed from the arrangement direction on the second surface 260b of the spacer 221, the first convex portion 261 or the like and the second convex portion 261 or the like are arranged. Since stress is concentrated on the portion 264 and the like, there is an increased risk that the spacer 221 will be damaged. Therefore, on the second surface 260b of the spacer 221, the second convex portion 264 and the like are arranged at positions adjacent to the first convex portion 261 and the like (positions that do not overlap with the first convex portion 261 and the like) when viewed from the arrangement direction. do. As a result, the stress applied to the first convex portion 261 and the like and the second convex portion 264 and the like can be dispersed, and the stress can be suppressed from being concentrated on the first convex portion 261 and the like and the second convex portion 264 and the like. Therefore, damage to the spacer 221 can be suppressed.

Further, the first convex portion 261 and the like on the first surface 260a and the second convex portion 264 and the like on the second surface 260b are extended in the same direction, so that the first convex portion 261 and the like are arranged at adjacent positions. The stress is easily dispersed between the second convex portion 264 and the like. As a result, it is possible to suppress the concentration of stress on the first convex portion 261 and the like and the second convex portion 264 and the like, so that damage to the spacer 221 can be suppressed.

Further, the second convex portion 266 of the second surface 260b is arranged between the two first convex portions 263 of the first surface 260a when viewed from the arrangement direction (Z-axis direction), so that the first convex portion Stress is likely to be dispersed between the 263 and the second convex portion 266. As a result, it is possible to suppress the concentration of stress on the first convex portion 263 and the second convex portion 266, so that damage to the spacer 221 can be suppressed. The same can be said for the first convex portion 261 and the two second convex portions 264, and the first convex portion 262 and the two second convex portions 265.

Further, the plurality of first convex portions 261 and the like on the first surface 260a and the plurality of second convex portions 264 and the like on the second surface 260b are alternately arranged when viewed from the above-mentioned arrangement direction (Z-axis direction). , The stress is easily dispersed in the first convex portion 261 and the like and the second convex portion 264 and the like. As a result, it is possible to suppress the concentration of stress on the first convex portion 261 and the like and the second convex portion 264 and the like, so that damage to the spacer 221 can be suppressed.

Further, at least one convex portion such as the first convex portion 261 or the like on the first surface 260a and the second convex portion 264 or the like on the second surface 260b is separated from the wall portion (side wall portion 280) facing the power storage element 210. By arranging the convex portion, at least one of the convex portions is easily deformed. In particular, since the concave wall portions 284 and 285 of the side wall portion 280 come into contact with the power storage element 210 and the movement is restricted, at least one of the convex portions such as the first convex portion 261 and the second convex portion 264 is concave. If it extends to the wall portions 284 and 285, the at least one convex portion is less likely to be deformed. Therefore, by arranging at least one convex portion such as the first convex portion 261 and the like and the second convex portion 264 apart from the concave wall portions 284 and 285, the at least one convex portion is easily deformed. Become. As a result, it is possible to suppress the concentration of stress on the at least one convex portion, so that damage to the spacer 221 can be suppressed.

[6 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. When the spacer 221 is not arranged, the spacer 222 can have the same function as the spacer 221 by having the same configuration of the first convex portion and the second convex portion as the spacer 221 described above.

In the above embodiment, the first convex portion 261 and the like and the second convex portion 264 and the like of the spacer 221 are extended linearly in the X-axis direction. However, at least one of these convex portions may extend in a direction different from the X-axis direction, such as a direction inclined from the X-axis direction or a Y-axis direction. For example, the first convex portion 261 and the second convex portion 264 may be extended in different directions. At least one of the first convex portion 261 and the like and the second convex portion 264 and the like may be extended in a curved shape instead of a linear shape. Although the second convex portion 264 or the like is a long convex portion, at least one convex portion of the second convex portion 264 or the like may not be a long convex portion.

In the above embodiment, the first convex portion 261 and the like are arranged on the first surface 260a of the spacer 221 and the second convex portion 264 and the like are arranged on the second surface 260b. However, the second convex portion 264 or the like may be arranged on the first surface 260a, and the first convex portion 261 or the like may be arranged on the second surface 260b.

In the above embodiment, the first convex portion 261 and the like and the second convex portion 264 and the like of the spacer 221 are arranged alternately when viewed from the Z-axis direction. However, the first convex portion 261 and the like and the second convex portion 264 and the like may be arranged in any order when viewed from the Z-axis direction. For example, the first convex portion 261 may be arranged laterally to the two second convex portions 264 instead of between the two second convex portions 264. Further, only one second convex portion 264 is arranged, and the first convex portion 261 may be arranged at a position adjacent to the one second convex portion 264. The same applies to the first convex portion 262 and the second convex portion 265, and the first convex portion 263 and the second convex portion 266.

In the above embodiment, the first convex portion 261 and the like and the second convex portion 264 and the like of the spacer 221 are arranged apart from the side wall portion 280. However, at least one of the first convex portion 261 and the like and the second convex portion 264 and the like may extend to the side wall portion 280 and reach the side wall portion 280.

In the above embodiment, the spacer 221 has a plurality of first convex portions and a plurality of second convex portions. However, the spacer 221 may have at least one first convex portion and at least one second convex portion arranged at adjacent positions.

In the above embodiment, the spacer 221 has a front wall portion 270, a pair of side wall portions 280, and a rear wall portion 290. However, the spacer 221 does not have to have at least one wall portion of the front wall portion 270, the pair of side wall portions 280 and the rear wall portion 290.

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 within 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 221.

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 Side convex part 242 Side concave part 250 Bus bar 260 Spacer body 260a First surface 260b Second surface 261, 262, 263 First convex part 264, 265, 266 Second convex part 270 Front wall part 281 Spacer Convex 282, 283, 284, 285 Concave wall 290 Rear wall 300 Electrical equipment unit

Claims (5)

A power storage device including a power storage element and a spacer arranged in the arrangement direction.
The spacer is
A spacer body having a planar first surface, which is one surface in the arrangement direction, and a planar second surface, which is the other surface.
A first convex portion arranged on the first surface and extending along the first surface,
A power storage device having a second convex portion arranged on the second surface and a second convex portion arranged at a position adjacent to the first convex portion when viewed from the arrangement direction. The power storage device according to claim 1, wherein the first convex portion and the second convex portion are arranged so as to extend in the same direction. The spacer has two said first protrusions.
The power storage device according to claim 1 or 2, wherein the second convex portion is arranged between the two first convex portions when viewed from the arrangement direction. The spacer has a plurality of the first convex portions and a plurality of the second convex portions.
The power storage device according to any one of claims 1 to 3, wherein the plurality of first convex portions and the plurality of second convex portions are alternately arranged when viewed from the arrangement direction. The spacer has a wall portion facing the power storage element in the extending direction of at least one of the first convex portion and the second convex portion.
The power storage device according to any one of claims 1 to 4, wherein the at least one convex portion is arranged apart from the wall portion.

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