JP2024002680A - Power storage device - Google Patents

Abstract

To provide a power storage device that can improve space usage efficiency.SOLUTION: A power storage device 10 includes a power storage unit 20 having a power storage element 211, and a spacer (weight 400) arranged in the first direction of the power storage unit 20, and the power storage unit 20 includes a first protrusion 331 that protrudes in a first direction, and the spacer forms a first space 401 into which the first protrusion 331 is inserted.SELECTED DRAWING: Figure 5

Description

The present invention relates to a power storage device including a power storage unit having a power storage element.

BACKGROUND ART Conventionally, a power storage device is known that includes a power storage unit having a power storage element and a spacer adjacent to the power storage unit. For example, Patent Document 1 discloses a battery pack (power storage device) in which a weight adjustment member (spacer) is disposed adjacent to a battery module (power storage unit).

JP2018-37185A

In the conventional power storage device described above, a protrusion may protrude from the power storage unit toward the spacer. In this case, a gap will be created between the power storage unit and the spacer, and there is a possibility that the space usage efficiency in the power storage device will be reduced.

The present invention was achieved by the inventors of the present invention paying new attention to the above-mentioned problem, and an object of the present invention is to provide a power storage device that can improve space usage efficiency.

A power storage device according to one aspect of the present invention includes a power storage unit having a power storage element, and a spacer disposed in a first direction of the power storage unit, wherein the power storage unit has a first spacer that protrudes in the first direction. The spacer has a protrusion, and the spacer forms a first space into which the first protrusion is inserted.

According to the power storage device of the present invention, space usage efficiency can be improved.

FIG. 1 is a perspective view showing the configuration of a power storage device according to an embodiment. FIG. 2 is a perspective view showing an internal configuration of an outer case of a power storage device according to an embodiment. FIG. 2 is an exploded perspective view showing each component when the power storage unit included in the power storage device according to the embodiment is disassembled. FIG. 1 is a perspective view showing the configuration of a power storage element unit according to an embodiment. FIG. 2 is a perspective view showing the configuration of a weight and the positional relationship between the weight and a protrusion on the inner case side wall according to the embodiment. FIG. 3 is a front view showing the positional relationship between the weights (first weight and second weight) and protrusions on the inner case side wall according to the embodiment. FIG. 3 is a top view showing the positional relationship between weights (first weight and second weight) and protrusions on the inner case side wall according to the embodiment.

(1) A power storage device according to one aspect of the present invention includes a power storage unit having a power storage element, and a spacer arranged in a first direction of the power storage unit, the power storage unit protruding in the first direction. and the spacer forms a first space into which the first protrusion is inserted.

According to this, in the power storage device, the power storage unit has the first protrusion protruding in the first direction, and the spacer forms the first space into which the first protrusion is inserted. In this manner, when the power storage unit has the first protrusion, the spacer forms the first space into which the first protrusion of the power storage unit is inserted. Thereby, by inserting the first protrusion into the first space, it is possible to suppress the generation of a gap between the power storage unit and the spacer. Therefore, it is possible to improve the efficiency of space usage in the power storage device.

(2) In the power storage device according to (1) above, the first space may extend from an edge of the spacer to the first protrusion in a second direction intersecting the first direction.

According to this, since the first space of the spacer extends from the edge of the spacer to the first protrusion, the first protrusion is inserted into the first space from the edge of the spacer and slid in the second direction. One protrusion can be easily inserted into the first space. Thereby, the power storage unit can be easily arranged with respect to the spacer.

(3) In the power storage device according to (2) above, the power storage unit has a plurality of the first protrusions lined up in the second direction, and the first space extends across the plurality of first protrusions. It may extend in the second direction.

According to this, the first space of the spacer extends across the plurality of first protrusions of the power storage unit, so by inserting the first protrusion at the end into the first space and then sliding it in the second direction, A plurality of first protrusions can be easily inserted into the first space.

(4) In the power storage device according to any one of (1) to (3) above, the power storage unit further includes a second protrusion aligned with the first protrusion in a third direction intersecting the first direction. The spacer may further form a second space into which the second protrusion is inserted.

If the spacer forms one first space into which the first protrusion and the second protrusion are inserted, the first space becomes large, and there is a risk that the spacer will be wasted. Therefore, in addition to the first space, a second space is formed into which the second protrusion is inserted. This can prevent wasteful space from being created in the spacer.

(5) In the power storage device according to any one of (1) to (4) above, the spacer includes a first spacer aligned with the first space in a third direction intersecting the first direction, and a first spacer lined up with the first space in a third direction intersecting the first direction. and a second spacer arranged in the first direction of one spacer.

According to this, by forming a first space in a position lined up with the first spacer in the third direction and arranging the second spacer in the first direction of the first spacer, the sizes of the first spacer and the second spacer can be adjusted. The size and shape of the first space can be adjusted depending on the space and shape. Thereby, the first space can be formed in the spacer with a simple configuration.

Hereinafter, a power storage device according to an embodiment of the present invention (including variations thereof) will be described with reference to the drawings. The embodiments described below are all inclusive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, manufacturing steps, order of manufacturing steps, etc. shown in the following embodiments are merely examples, and do not limit the present invention. In each figure, dimensions etc. are not strictly illustrated. In each figure, the same or similar components are designated by the same reference numerals.

In the following description and drawings, the direction in which the short side walls of the outer case of the power storage device face each other, the direction in which a pair of external terminals of the power storage element unit are arranged, or the direction in which the long sides of the container of the power storage device face each other are referred to as the X-axis direction. It is defined as The opposing direction of the long side walls of the outer case of the power storage device, the protruding direction of the external terminal of the power storage element unit, the opposing direction of the short side of the power storage element container, or the direction in which the pair of electrode terminals of the power storage element are arranged is the Y axis. Define direction. The direction in which the main body of the outer case of the power storage device and the lid are lined up, the direction in which the main body and the lid of the container of the power storage element are lined up, the protruding direction of the electrode terminal of the power storage element, or the vertical direction is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect with each other (orthogonal in this embodiment).

In the following description, the X-axis plus direction refers to the arrow direction of the X-axis, and the X-axis minus direction refers to the opposite direction to the X-axis plus direction. When simply referred to as the X-axis direction, it refers to both or one of the X-axis plus direction and the X-axis minus direction. The same applies to the Y-axis direction and the Z-axis direction. Below, the X-axis direction may also be referred to as the first direction, the Z-axis direction may also be referred to as the second direction, and the Y-axis direction may also be referred to as the third direction. Expressions indicating relative directions or orientations, such as parallel and orthogonal, include cases where the directions or orientations are not strictly speaking. For example, when two directions are parallel, it does not only mean that the two directions are completely parallel, but also that they are substantially parallel, that is, they may differ by a few percent, for example. means. In the following description, when the expression "insulation" is used, it means "electrical insulation".

(Embodiment)
[1 General description of power storage device 10]
First, a general description of power storage device 10 in this embodiment will be given. FIG. 1 is a perspective view showing the configuration of a power storage device 10 according to the present embodiment. FIG. 1 shows a state in which an outer case lid 120 is removed from an outer case body 110 of an outer case 100 included in the power storage device 10. FIG. 2 is a perspective view showing the internal configuration of outer case 100 of power storage device 10 according to the present embodiment. FIG. 2 shows a state in which the power storage unit 20 inside the outer case 100 included in the power storage device 10 is taken out from the outer case main body 110. FIG. 3 is an exploded perspective view showing each component when power storage unit 20 included in power storage device 10 according to the present embodiment is disassembled.

Power storage device 10 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a rectangular parallelepiped shape in this embodiment. The power storage device 10 is used for power storage, power supply, or the like. The power storage device 10 is used as a battery for driving or starting an engine of a mobile object such as an automobile, a motorcycle, a forklift, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. used. Examples of the above-mentioned vehicles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and fossil fuel (gasoline, diesel oil, liquefied natural gas, etc.) vehicles. Examples of the above-mentioned railway vehicles for electric railways include electric trains, monorails, linear motor cars, and hybrid electric trains equipped with both a diesel engine and an electric motor. The power storage device 10 can also be used as a stationary battery or the like used for home or business purposes.

As shown in FIGS. 1 to 3, power storage device 10 includes an outer case 100, a power storage unit 20, and a weight 400. The power storage unit 20 includes a power storage element unit group 200 including a plurality of power storage element units 210 and an inner case 300. In addition to the above configuration, the power storage device 10 includes a positive electrode and a negative electrode general terminal of the power storage device 10, a conductive member (wiring, bus bar, etc.) that connects the power storage element units 210 to each other or the power storage element units 210 and the general terminal, and It also includes electrical components such as a circuit board, relay, fuse, shunt resistor, and connector for monitoring or controlling the state (voltage, temperature, charging/discharging state, etc.) of the power storage element unit 210, but illustrations and detailed explanations are omitted. do.

Outer case 100 is a rectangular parallelepiped-shaped (box-shaped) container (outer box) that constitutes an outer case (exterior body, housing, outer shell) of power storage device 10 . The outer case 100 is disposed outside the power storage unit 20 (power storage element unit group 200, inner case 300), weight 400, etc., accommodates these in a predetermined position, and protects them from impact and the like. The outer case 100 is a metal case made of a metal member such as aluminum, aluminum alloy, stainless steel, iron, or plated steel plate. The outer case 100 may be formed of an insulating member such as any resin material that can be used for the cover member 216 of the power storage element unit 210 described later.

As shown in FIG. 1, the outer case 100 includes an outer case body 110 that constitutes the main body of the outer case 100, and an outer case lid body 120 that constitutes the lid body of the outer case 100. The outer case main body 110 is a rectangular cylindrical housing with a bottom that opens in the positive direction of the Z-axis, and accommodates the power storage unit 20 (power storage element unit group 200, inner case 300), weight 400, etc., and holds it at a predetermined position. Fix it with.

Specifically, as shown in FIG. 2, a rectangular opening 110a is formed in the outer case body 110 in the positive Z-axis direction. The outer case main body 110 has a flat and rectangular outer case bottom wall 111 arranged in the negative Z-axis direction. The outer case main body 110 has outer case side walls 112 that are a pair of flat rectangular short side walls on both sides in the X-axis direction, and a pair of flat rectangular long side walls on both sides in the Y-axis direction. It has an outer case side wall 113. The outer case side wall 112 is a wall facing (orthogonal to) the X-axis direction, and is arranged at the end of the outer case body 110 in the X-axis direction. The outer case side wall 113 is a wall facing (orthogonal to) the Y-axis direction, and is arranged at the end of the outer case body 110 in the Y-axis direction.

The outer case lid 120 is a plate-shaped and rectangular lid that closes the opening 110a of the outer case main body 110. The outer case main body 110 and the outer case lid 120 are joined by screwing with bolts or the like. Thereby, the outer case 100 has a structure in which the inside is sealed (sealed). The outer case main body 110 and the outer case lid 120 may be joined by welding, adhesive, or the like. The outer case body 110 and the outer case lid 120 may be made of the same material, or may be made of different materials. Depending on the configuration (number, size, shape, etc.) of the contents of the outer case 100, the outer case body 110 (outer case bottom wall 111, outer case side walls 112, 113) and outer case lid 120 may be It may be shaped. In this case, the outer case side wall 112 may be a long side wall, and the outer case side wall 113 may be a short side wall.

As shown in FIG. 3, the power storage element unit group 200 includes a plurality of power storage element units 210. In the present embodiment, the power storage element unit group 200 includes six power storage element units 210 in which three power storage element units 210 are arranged in the X-axis direction and two stages are arranged in the Z-axis direction. The number of power storage element units 210 included in the power storage element unit group 200 is not particularly limited, and any number of power storage element units 210 may be arranged in the Z-axis direction, and how many power storage element units 210 may be arranged in the X-axis direction. Alternatively, a plurality of power storage element units 210 may be arranged in the Y-axis direction. The power storage element unit group 200 may include only one power storage element unit 210. In this embodiment, all the power storage element units 210 are connected in series, but any of the power storage element units 210 may be connected in parallel. A detailed description of the configuration of power storage element unit 210 will be described later.

Inner case 300 is a substantially rectangular parallelepiped (box-shaped) container (inner box) that constitutes an inner case (casing) of power storage device 10 . Inner case 300 is disposed outside power storage element unit group 200, houses and holds power storage element unit group 200 (power storage element unit 210), and protects it from impact and the like. The inner case 300 is a metal case made of a metal member such as aluminum, aluminum alloy, stainless steel, iron, or plated steel plate. In this embodiment, inner case 300 is made of the same material as outer case 100, but may be made of a different material from outer case 100. Inner case 300 may be formed of an insulating member such as any resin material that can be used for cover member 216 of power storage element unit 210, which will be described later.

As shown in FIGS. 2 and 3, the inner case 300 includes an inner case upper wall 310 that forms the upper wall of the inner case 300, an inner case bottom wall 320 that forms the bottom wall of the inner case 300, and an inner case bottom wall 320 that forms the bottom wall of the inner case 300. Inner case side walls 330 to 360 constitute four side walls of the inner case. Inner case 300 further includes an intermediate member 370 between power storage element unit group 200 and inner case side wall 330. In this embodiment, the inner case top wall 310, the inner case bottom wall 320, each of the inner case side walls 330 to 360, and the intermediate member 370 are all constructed separately. That is, the inner case 300 has six walls (and one intermediate member 370) that are configured separately from each other.

The inner case upper wall 310 is a flat rectangular upper wall parallel to the XY plane (facing (perpendicular to) the Z-axis direction) and arranged in the positive Z-axis direction of the power storage element unit group 200. Inner case upper wall 310 is arranged between power storage element unit group 200 and outer case lid 120 in the Z-axis direction. The inner case upper wall 310 is joined to the ends of the inner case side walls 330, 340, and 360 in the Z-axis positive direction by screwing with bolts or the like. In this embodiment, the inner case upper wall 310 is arranged in the Z-axis positive direction of the inner case side walls 330, 340, and 360, and is aligned with the Z-axis positive direction ends of the inner case side walls 330, 340, and 360 in the Z-axis direction. It is joined with. On the inner case upper wall 310, electrical components such as a circuit board, a relay, a fuse, a shunt resistor, a connector, etc. that monitor or control the state (voltage, temperature, charging/discharging state, etc.) of the power storage element unit 210 are arranged. good.

Inner case bottom wall 320 is a flat rectangular bottom wall that is arranged in the negative Z-axis direction of power storage element unit group 200 and is parallel to the XY plane (facing (orthogonal to) Z-axis direction). Inner case bottom wall 320 is arranged between power storage element unit group 200 and outer case bottom wall 111 in the Z-axis direction. The inner case bottom wall 320 is joined to the ends of the inner case side walls 330 to 360 in the negative Z-axis direction by bolts or the like. In this embodiment, the inner case bottom wall 320 is disposed between the inner case side walls 330 and 340 in the X-axis direction, and is joined to the Z-axis minus direction ends of the inner case side walls 330 and 340 in the X-axis direction. Ru. The inner case bottom wall 320 is disposed between the inner case side walls 350 and 360 in the Y-axis direction, and is joined to the Z-axis minus direction ends of the inner case side walls 350 and 360 in the Y-axis direction.

The inner case bottom wall 320 may be joined (fixed) to the outer case bottom wall 111 by adhesion using an adhesive or double-sided tape, welding, welding, bolting, caulking, or the like. Between the inner case bottom wall 320 and the outer case bottom wall 111, a plate-like member such as a rubber plate or a resin member for tolerance absorption or vibration suppression (non-slip), or another member such as a weight is arranged. You can.

The intermediate member 370 is a flat rectangular member that is arranged in the positive X-axis direction of the power storage element unit group 200 and is parallel to the YZ plane (facing (perpendicular to) the X-axis direction). Intermediate member 370 is arranged between power storage element unit group 200 and inner case side wall 330 in the X-axis direction. Intermediate member 370 covers almost the entire surface of power storage element unit group 200 when viewed from the X-axis direction, and is formed to have a size slightly smaller than inner case side wall 330.

The inner case side walls 330 and 340 are flat, rectangular short side walls parallel to the YZ plane (facing (orthogonal to) the X-axis direction) arranged on both sides of the power storage element unit group 200 in the X-axis direction. . Inner case side wall 330 is arranged in the X-axis positive direction of power storage element unit group 200, and inner case side wall 340 is arranged in the X-axis negative direction of power storage element unit group 200. Specifically, inner case side wall 330 is arranged between power storage element unit group 200 and outer case side wall 112, specifically, between intermediate member 370 and weight 400 in the X-axis direction. Inner case side wall 340 is arranged between power storage element unit group 200 and outer case side wall 112, specifically, between power storage element unit group 200 and weight 400 in the X-axis direction. The inner case side walls 330 and 340 are joined to the X-axis direction ends of the inner case top wall 310, the inner case bottom wall 320, and the inner case side walls 350 and 360 by screwing with bolts or the like. In this embodiment, the inner case side walls 330 and 340 are arranged on the outer side of the inner case bottom wall 320 and the inner case side wall 360 in the X-axis direction, and are arranged at both ends of the inner case bottom wall 320 and the inner case side wall 360 in the X-axis direction. and are joined in the X-axis direction.

The inner case side wall 330 has a first protrusion 331 that protrudes in the X-axis direction (first direction). The first protrusion 331 is a portion that protrudes in the X-axis positive direction from the surface of the inner case side wall 330 in the X-axis positive direction. The inner case side wall 330 has a plurality of first protrusions 331 arranged in the Z-axis direction (second direction intersecting the first direction). In this embodiment, two first protrusions 331 that protrude in the X-axis plus direction are arranged side by side in the Z-axis direction. The first protrusion 331 is a portion including the head of a bolt having a male thread. Specifically, the first protrusion 331 is the head of a push bolt that has the function of pushing the intermediate member 370 in the negative direction of the X-axis by being screwed into a screw hole having a female thread formed in the inner case side wall 330. , and a loosening prevention nut connected to the push bolt (see FIG. 7).

The inner case side wall 330 further includes a second protrusion 332 that is aligned with the first protrusion 331 in the Y-axis direction (a third direction intersecting the first direction and the second direction). A plurality (two) of second protrusions 332 are arranged in the Y-axis direction (Y-axis plus direction) of the plurality (two) of first protrusions 331 in the Z-axis direction. The second protrusion 332, like the first protrusion 331, is a portion that protrudes in the X-axis plus direction from the surface of the inner case side wall 330 in the X-axis plus direction. The second protrusion 332, like the first protrusion 331, is a part that includes the head of the push bolt and a nut for preventing loosening.

The inner case side wall 330 further includes a third protrusion 333 that is aligned with the first protrusion 331 and the second protrusion 332 in the Y-axis direction (third direction). A plurality of (two) third protrusions 333 are arranged in the Z-axis direction in the Y-axis direction (Y-axis positive direction) of the plurality (two) of first protrusions 331 and the plurality of (two) second protrusions 332. It is located in The third protrusion 333 is a portion that protrudes in the X-axis positive direction from the surface of the inner case side wall 330 in the X-axis positive direction, like the first protrusion 331 and the like. The third protrusion 333, like the first protrusion 331 and the like, is a part that includes the head of the push bolt and a nut for preventing loosening.

With this configuration, a plurality of first protrusions 331, a plurality of second protrusions 332, and a plurality of third protrusions 333 are arranged in a lattice shape at approximately equal intervals on the inner case side wall 330. Each of these protrusions (first protrusion 331, second protrusion 332, and third protrusion 333) on the inner case side wall 330 pushes the intermediate member 370 in the negative direction of the X-axis, so that the power storage element unit group 200 is can be fixed. These protrusions of the inner case side wall 330 are inserted into a space provided in a weight 400, which will be described later. A detailed description of the positional relationship between the weight 400 and the protrusion of the inner case side wall 330 will be described later.

The inner case side walls 350 and 360 are flat and rectangular long side walls parallel to the XZ plane (facing (orthogonal to) the Y-axis direction) arranged on both sides of the power storage element unit group 200 in the Y-axis direction. . Inner case side wall 350 is arranged in the Y-axis negative direction of power storage element unit group 200, and inner case side wall 360 is arranged in the Y-axis positive direction of power storage element unit group 200. Inner case side walls 350 and 360 are arranged between power storage element unit group 200 and outer case side wall 113 in the Y-axis direction. The inner case side wall 350 is joined to the Y-axis minus direction ends of the inner case bottom wall 320 and the inner case side walls 330 and 340 by screwing with bolts or the like. In this embodiment, the inner case side wall 350 is arranged in the negative Y-axis direction of the inner case bottom wall 320 and the inner case side walls 330 and 340, and It is joined to the direction end portion in the Y-axis direction. The inner case side wall 360 is joined to the Y-axis positive direction ends of the inner case top wall 310, the inner case bottom wall 320, and the inner case side walls 330 and 340 by screwing with bolts or the like. In this embodiment, the inner case side wall 360 is arranged in the positive Y-axis direction of the inner case bottom wall 320 and joined to the end of the inner case bottom wall 320 in the positive Y-axis direction in the Y-axis direction.

Inner case 300 has at least one wall of inner case top wall 310, inner case bottom wall 320, inner case side walls 340 to 360, and intermediate member 370 contacting power storage element unit group 200, so that power storage element unit group 200 movement restrictions. In this embodiment, the inner case top wall 310, the inner case bottom wall 320, the inner case side walls 340, 360, and the intermediate member 370 contact the power storage element unit group 200, but the inner case side wall 350 also contacts the power storage element unit group. 200 may be contacted. At least one wall of the inner case top wall 310, the inner case bottom wall 320, and the inner case side walls 340 to 360 has a plate-like member such as a rubber plate or a resin member for tolerance absorption or vibration suppression (slip prevention) on the inner surface. etc., and the plate-like member or the like may be in contact with the power storage element unit group 200.

The inner case top wall 310, the inner case bottom wall 320, and the inner case side walls 330 to 360 may be joined together by welding, adhesive, or the like. The inner case top wall 310, the inner case bottom wall 320, the inner case side walls 330 to 360, and the intermediate member 370 may all be made of the same material, or any one of them may be made of a different material. You can. Depending on the size and shape of the power storage element unit group 200, the inner case top wall 310, the inner case bottom wall 320, the inner case side walls 330 to 360, and the intermediate member 370 may have any shape. In this case, the inner case side walls 330 and 340 may be the long side walls, and the inner case side walls 350 and 360 may be the short side walls.

Weight 400 is a weight placed inside outer case 100 and outside of inner case 300. Weight 400 is a weight (counterweight) that adjusts the weight of power storage device 10 . The weight 400 is disposed opposite to and in contact with the outer case side wall 112 of the outer case main body 110 of the outer case 100 . In this embodiment, the weight 400 is joined (fixed) to the outer case side wall 112 by welding (spot welding or the like) or the like. The weight 400 may be joined (fixed) to the outer case side wall 112 by adhesion using an adhesive or double-sided tape, welding, bolt connection, caulking, or the like.

In this embodiment, two weights 400 are arranged on both sides of the power storage unit 20 (power storage element unit group 200) in the X-axis direction (first direction). Specifically, a first weight 410 and a second weight 420 are arranged as the weight 400 between the inner case side wall 330 and the outer case side wall 112 in the positive direction of the X-axis (see FIGS. 5 and 6, etc.). . A third weight 430 having a rectangular parallelepiped shape that is flat in the X-axis direction is arranged as a weight 400 between the inner case side wall 340 and the outer case side wall 112 in the negative X-axis direction (see FIGS. 5 and 6, etc.). . A detailed description of the configuration of the weights 400 (first weight 410 and second weight 420) will be described later.

The weight of the weight 400 is appropriately determined depending on the weight required to adjust the weight of the power storage device 10, but in this embodiment, the weight of one weight 400 (the total of the first weight 410 and the second weight 420) The weight (or the weight of the third weight 430) is approximately 50 to 60 kg. The total weight of all (two in this embodiment) weights 400 included in power storage device 10 is preferably 1/5 or more of the total weight of power storage device 10, and more preferably 1/4 or more. Preferably, it is more preferably 1/3 or more.

The material of the weight 400 is not particularly limited, but it can be made of any metal member that can be used for the outer case 100 and the inner case 300, such as aluminum, aluminum alloy, stainless steel, and iron. In this embodiment, all weights 400 (first weight 410, second weight 420, and third weight 430) are formed of the same material as outer case 100 and inner case 300. The first weight 410, the second weight 420, and the third weight 430 may be made of a material different from that of the outer case 100 and the inner case 300, or any of the weights may be made of a different material. You can.

[2 Description of power storage element unit 210]
Next, the configuration of power storage element unit 210 will be described in detail. FIG. 4 is a perspective view showing the configuration of power storage element unit 210 according to this embodiment. FIG. 4 shows an enlarged view of one power storage element unit 210 shown in FIG. 3, and shows the power storage element 211 located inside and the external terminal 215 with broken lines. Since the plurality of power storage element units 210 included in the power storage device 10 (power storage unit 20, power storage element unit group 200) all have the same configuration, one power storage element unit 210 is shown in FIG. 4, and below, The configuration of one power storage element unit 210 will be described in detail.

The power storage element unit 210 is a substantially rectangular parallelepiped-shaped battery module (battery assembly) that can charge electricity from the outside and discharge electricity to the outside. As shown in FIG. 4, the power storage element unit 210 includes a plurality of power storage elements 211, a pair of end plates 212, a pair of side plates 213, an exterior member 214, and a pair (positive electrode and negative electrode) of external terminals 215. , and a pair (a positive electrode and a negative electrode) of cover members 216. In addition to the above configuration, the power storage element unit 210 also includes spacers arranged between the power storage elements 211, busbars that connect the electrode terminals 211b of the plurality of power storage elements 211, a busbar frame that positions the busbars, and the like. However, illustration and detailed description will be omitted.

The power storage element 211 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. In this embodiment, a plurality of power storage elements 211 are arranged side by side in the X-axis direction and the Y-axis direction, but the direction and number of power storage elements 211 are not particularly limited, and only one power storage element 211 is arranged. It can also be a configuration. In the present embodiment, the power storage element 211 has a rectangular parallelepiped shape (square) that is flat in the X-axis direction, but the shape of the power storage element 211 is not limited to the rectangular parallelepiped shape, and may be a polygonal prism other than the rectangular parallelepiped shape. The shape may be a cylinder, an elongated cylinder, an elliptical cylinder, or the like. The power storage element 211 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or a capacitor. The power storage element 211 may be not a secondary battery but a primary battery that allows the user to use the stored electricity without charging it. The power storage element 211 may be a battery using a solid electrolyte. The power storage element 211 may be a pouch type power storage element.

The power storage element 211 has a container 211a and a pair (positive electrode and negative electrode) of electrode terminals 211b. Inside the container 211a, an electrode body, a pair of current collectors (a positive electrode and a negative electrode), an electrolytic solution (non-aqueous electrolyte), and the like are accommodated, but illustration and detailed description thereof will be omitted. The container 211a has a container body in which an opening is formed, and a lid portion that closes the opening of the container body, and the electrode terminal 211b is arranged to protrude from the lid portion in the positive Z-axis direction. Ru. The electrode terminal 211b is electrically connected to the positive electrode plate and the negative electrode plate of the electrode body via a conductive current collector. The electrode body is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator.

A pair of end plates 212 and a pair of side plates 213 sandwich a plurality of power storage elements 211 from both sides of the arrangement direction (X-axis direction), so that each power storage element 211 can be held on both sides of the arrangement direction (X-axis direction). This is a restraining member that compresses (restricts) the body. The end plate 212 and the side plate 213 are formed of a metal member such as steel or stainless steel from the viewpoint of ensuring strength, but the material is not particularly limited, and they are formed of a high-strength insulating member. Alternatively, the metal member may be subjected to insulation treatment.

The end plate 212 is a plate-shaped and rectangular member arranged in the X-axis direction of the power storage element 211. A pair of end plates 212 are arranged on both sides of the plurality of power storage elements 211 in the X-axis direction, and hold the plurality of power storage elements 211 by sandwiching them from both sides in the X-axis direction. The end plate 212 may be a flat block-like member instead of a plate-like member.

When the power storage element unit 210 (power storage element unit group 200) is arranged in the inner case 300, the end plate 212 of the power storage element unit 210 located at the end in the X-axis direction comes into contact with the inner surface of the inner case 300. (See Figure 6). That is, the end plates 212 located at both ends in the X-axis direction of the power storage element unit group 200 are in contact with the inner case side wall 340 and the inner surface of the intermediate member 370. As described above, when the inner case side wall 340 has a plate-like member on its inner surface, the end plate 212 comes into contact with the plate-like member. Furthermore, two power storage element units 210 adjacent in the X-axis direction are arranged with their end plates 212 facing each other in the X-axis direction contacting each other (overlapping in the X-axis direction). Similarly, two power storage element units 210 adjacent in the Z-axis direction are arranged with their end plates 212 facing each other in the Z-axis direction contacting each other (overlapping in the Z-axis direction). When another member is sandwiched between the end plates 212, the end plates 212 indirectly contact each other via the other member.

The side plate 213 is a plate-shaped and rectangular member arranged in the Y-axis direction of the power storage element 211. That is, the pair of side plates 213 are arranged on both sides of the plurality of power storage elements 211 in the Y-axis direction. The side plates 213 have both ends in the X-axis direction attached to the ends in the Y-axis direction of the pair of end plates 212, and bind the plurality of power storage elements 211 by connecting the pair of end plates 212. That is, the side plate 213 extends in the X-axis direction so as to straddle the plurality of power storage elements 211 and applies a restraining force to the plurality of power storage elements 211 in the X-axis direction. In this embodiment, the side plate 213 is joined (fixed) to the end plate 212 by bolts and nuts (not shown), but may be joined (fixed) by welding, adhesive, or the like. The side plate 213 may be a long rod-shaped member or the like instead of a plate-like member.

The exterior member 214 is a member that covers the plurality of power storage elements 211 and the like in the Z-axis positive direction, and protects the plurality of power storage elements 211 and the like from external shocks and the like. The exterior member 214 is attached and fixed to the pair of side plates 213. In this embodiment, the exterior member 214 is a metal member, but it may also be a resin member.

The external terminal 215 is an external terminal that is electrically connected to the electrode terminal 211b of the power storage element 211 to charge electricity from the outside and discharge electricity to the outside. That is, external terminal 215 is a terminal member different from electrode terminal 211b of power storage element 211. The external terminal 215 is formed of a metal conductive member such as aluminum, aluminum alloy, copper, copper alloy, nickel, or a combination thereof, or a conductive member other than metal. External terminal 215 is arranged at the end of power storage element unit 210 in the Y-axis direction. In this embodiment, a pair of external terminals 215 (a positive electrode and a negative electrode) aligned in the X-axis direction are arranged at an end in the negative Y-axis direction, an end in the positive Z-axis direction, and both ends in the X-axis direction of the power storage element unit 210. has been done. External terminal 215 is arranged so as to protrude from the main body portion of power storage element unit 210 (the part where power storage element 211 is arranged) in the negative direction of the Y-axis. Specifically, the external terminal 215 protrudes in the Y-axis negative direction from a surface of the side plate 213 in the Y-axis negative direction and a surface of the exterior member 214 in the Y-axis negative direction.

The cover member 216 is a cover member for the external terminal 215 that is arranged to cover the external terminal 215. The cover member 216 is made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (PET). , polybutylene terephthalate (PBT), polyether ether ketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether sulfone (PES), polyamide (PA), ABS It is formed of an insulating member such as resin or a composite material thereof, or metal coated with an insulating coating. The cover member 216 thereby protects the external terminal 215 and prevents the external terminal 215 from coming into contact with an external metal member or the like.

[3. Explanation of the configuration of the weight 400 and its positional relationship with the protrusion of the inner case side wall 330]
Next, the configuration of the weight 400 (the first weight 410 and the second weight 420) and the positional relationship between the weight 400 and the protrusions (the first protrusion 331, the second protrusion 332, and the third protrusion 333) on the inner case side wall 330 are explained. will be explained in detail. FIG. 5 is a perspective view showing the configuration of the weight 400 and the positional relationship between the weight 400 and the protrusion of the inner case side wall 330 according to the present embodiment. FIG. 5 shows the configuration of the first weight 410 and the second weight 420 as the weight 400, and also shows the positional relationship between the first weight 410, the second weight 420 and the protrusion of the inner case side wall 330. FIG. 5 shows a state before the protrusion of the inner case side wall 330 is inserted into the space of the weight 400. When the protrusion of the inner case side wall 330 is inserted into the space of the weight 400, the weight 400 is fixed to the outer case side wall 112 of the outer case 100, but in FIG. The illustration of 100 is omitted.

FIG. 6 is a front view showing the positional relationship between the weights 400 (first weight 410 and second weight 420) and the protrusion of the inner case side wall 330 according to the present embodiment. FIG. 6 is a front view showing the state after the protrusion of the inner case side wall 330 is inserted into the space of the weight 400. For convenience of explanation, FIG. 6 shows the outer case side wall 113 and the inner case in the negative Y-axis direction from a state in which the power storage unit 20 (power storage element unit group 200, inner case 300) and weight 400 are housed in the outer case main body 110. It is a diagram of the configuration with the side wall 350 removed, viewed from the negative direction of the Y-axis. FIG. 7 is a top view showing the positional relationship between the weights 400 (first weight 410 and second weight 420) and the protrusion of the inner case side wall 330 according to the present embodiment. FIG. 7 is a top view showing the state after the protrusion of the inner case side wall 330 is inserted into the space of the weight 400. FIG. 7 shows a configuration in which the power storage unit 20 (power storage element unit group 200, inner case 300) and weight 400 are housed in the outer case main body 110, with the inner case upper wall 310 removed for convenience of explanation. It is a view seen from the axis positive direction.

As shown in FIG. 5, the weight 400 in the positive direction of the X-axis includes a first weight 410 and a second weight 420. In this embodiment, the weight 400 includes four first weights 411 to 414, which are the first weights 410, and one second weight 420. This weight 400 is an example of a "spacer," the first weight 410 (411 to 414) is an example of a "first spacer," and the second weight 420 is an example of a "second spacer."

Each of the four first weights 410 (411 to 414) is a rectangular parallelepiped weight that is flat in the X-axis direction and extends in the Z-axis direction. A first weight 411 is arranged at the end in the negative direction of the Y-axis, and first weights 412, 413, and 414 are arranged in order from the first weight 411 in the positive direction of the Y-axis. The first weights 411 and 414 are formed in the same shape, and the first weights 412 and 413 are formed in the same shape. The first weights 411 and 414 are formed to have a shorter length in the Y-axis direction (about half the length) than the first weights 412 and 413. The second weight 420 (second spacer) is a rectangular parallelepiped weight that is flat in the X-axis direction and is arranged in the X-axis direction (first direction) of the first weight 410 (first spacer).

Specifically, the four first weights 410 (411 to 414) are arranged at intervals in the Y-axis direction from one end to the other end of the second weight 420 in the Y-axis direction, and The second weight 420 is placed in contact with the surface of the second weight 420 in the negative direction of the X-axis. In this embodiment, the first weight 410 (411 to 414) is joined (fixed) to the second weight 420 by welding (spot welding or the like) or the like. The first weight 410 (411 to 414) may be joined (fixed) to the second weight 420 by adhesion with an adhesive or double-sided tape, welding, bolt connection, caulking connection, or the like.

As a result, a space is formed between the four first weights 410 (411 to 414). Specifically, a rectangular parallelepiped-shaped first space 401 extending in the Z-axis direction is formed between the first weight 411 and the first weight 412. A rectangular parallelepiped-shaped second space 402 extending in the Z-axis direction is formed between the first weight 412 and the first weight 413. A rectangular parallelepiped-shaped third space 403 extending in the Z-axis direction is formed between the first weight 413 and the first weight 414. In this way, the first weight 410 (411 to 414) is aligned with the first space 401, second space 402, and third space 403 in the Y-axis direction (third direction). The first space 401, the second space 402, and the third space 403 are spaces that extend in the Z-axis direction from one end edge of the weight 400 in the Z-axis direction to the other end edge, and have the same shape and the same size.

The first space 401 is a space into which the first protrusion 331 of the inner case side wall 330 is inserted. That is, the first space 401 is a space into which a plurality of (two) first protrusions 331 provided on the inner case side wall 330 are inserted. Since the first weights 411 and 412 are formed to have a plate thickness (thickness in the X-axis direction) larger than the protrusion amount of the first protrusion 331, the first protrusion 331 can be arranged in the first space 401. In this way, the weight 400 (spacer) forms a first space 401 into which the first protrusion 331 is inserted. The process of inserting the first protrusion 331 into the first space 401 is as follows.

When power storage unit 20 is inserted into outer case body 110, weights 400 (first weight 411 and first weight 412) are fixed to outer case side wall 112 of outer case body 110. In this state, power storage unit 20 is inserted from opening 110a of outer case main body 110 toward the negative Z-axis direction. As a result, the plurality of first protrusions 331 of the inner case side wall 330 are inserted into the first space 401 from the edge of the weight 400 in the Z-axis plus direction. That is, the first protrusion 331 in the negative Z-axis direction enters the first space 401 from the edge of the weight 400 in the positive Z-axis direction, and moves within the first space 401 in the negative Z-axis direction. Therefore, the first space 401 extends from the edge of the weight 400 (spacer) to the first protrusion 331 in the Z-axis direction (second direction). Furthermore, the first protrusion 331 in the Z-axis plus direction also enters the first space 401 from the edge of the weight 400 in the Z-axis plus direction, and moves within the first space 401 in the Z-axis minus direction. Therefore, the first space 401 extends in the Z-axis direction (second direction) across the plurality of first protrusions 331.

The second space 402 is a space into which the second protrusion 332 of the inner case side wall 330 is inserted. That is, the second space 402 is a space into which a plurality (two) of second protrusions 332 provided on the inner case side wall 330 are inserted. Since the first weights 412 and 413 are formed to have a plate thickness (thickness in the X-axis direction) larger than the protrusion amount of the second protrusion 332, the second protrusion 332 can be arranged in the second space 402. In this way, the weight 400 (spacer) further forms a second space 402 into which the second protrusion 332 is inserted. The process of inserting the second protrusion 332 into the second space 402 is the same as the process of inserting the first protrusion 331 into the first space 401, so a detailed explanation will be omitted. Similar to the first space 401, the second space 402 extends from the edge of the weight 400 (spacer) to the second protrusion 332 in the Z-axis direction (second direction). The second space 402 extends in the Z-axis direction (second direction) across the plurality of second protrusions 332.

The third space 403 is a space into which the third protrusion 333 of the inner case side wall 330 is inserted. That is, the third space 403 is a space into which a plurality of (two) third protrusions 333 provided on the inner case side wall 330 are inserted. Since the first weights 413 and 414 are formed to have a plate thickness (thickness in the X-axis direction) larger than the protrusion amount of the third protrusion 333, the third protrusion 333 can be arranged in the third space 403. In this way, the weight 400 (spacer) further forms a third space 403 into which the third protrusion 333 is inserted. The process of inserting the third protrusion 333 into the third space 403 is the same as the process of inserting the first protrusion 331 into the first space 401, so a detailed explanation will be omitted. Similar to the first space 401, the third space 403 extends from the edge of the weight 400 (spacer) to the third protrusion 333 in the Z-axis direction (second direction). The third space 403 extends in the Z-axis direction (second direction) across the plurality of third protrusions 333.

In this embodiment, when the power storage unit 20 is inserted into the outer case main body 110, a gap is formed between the inner case side walls 330, 340 and the weight 400, but the gap is not formed. Good too. A gap is also formed between the inner case side walls 350, 360 and the outer case side wall 113 of the outer case body 110, but the gap does not need to be formed either. When a gap is formed, when inserting power storage unit 20 into outer case main body 110, the insertion work becomes easier and workability can be improved. When no gap is formed, the space usage efficiency in power storage device 10 can be improved.

[4 Explanation of effects]
As described above, according to the power storage device 10 according to the embodiment of the present invention, the power storage unit 20 has the first protrusion 331 that projects in the X-axis direction (first direction), and the weight 400 (spacer) , forming a first space 401 into which the first protrusion 331 is inserted. In this way, when the power storage unit 20 has the first projection 331, the weight 400 (spacer) forms the first space 401 into which the first projection 331 of the power storage unit 20 is inserted. Thereby, by inserting the first protrusion 331 into the first space 401, it is possible to suppress the generation of a gap between the power storage unit 20 and the weight 400 (spacer). Therefore, the space usage efficiency in power storage device 10 can be improved. This is particularly effective when the first protrusion 331 cannot be accommodated by counterboring the inner case 300 because the inner case 300 is thin or the like.

A first space 401 of the weight 400 (spacer) extends from the edge of the weight 400 (spacer) to the first protrusion 331. Therefore, by inserting the first protrusion 331 into the first space 401 from the edge of the weight 400 (spacer) and sliding it in the Z-axis direction (second direction), the first protrusion 331 can be easily inserted into the first space 401. can be inserted into Thereby, power storage unit 20 can be easily arranged with respect to weight 400 (spacer).

A first space 401 of the weight 400 (spacer) extends across the plurality of first protrusions 331 of the power storage unit 20. Therefore, by inserting the first protrusion 331 at the end into the first space 401 and then sliding it in the Z-axis direction (second direction), the plurality of first protrusions 331 can be easily inserted into the first space 401. . Thereby, power storage unit 20 can be easily arranged with respect to weight 400 (spacer).

When one first space 401 into which the first protrusion 331 and the second protrusion 332 are inserted is formed by the weight 400 (spacer), the first space 401 becomes larger, and the weight 400 (spacer) has wasted space. There is a risk that this may occur. Therefore, in addition to the first space 401, a second space 402 into which the second protrusion 332 is inserted is formed. Thereby, it is possible to suppress the generation of wasted space in the weight 400 (spacer). In this embodiment, since the weight 400 (spacer) is a weight for adjusting the weight of the power storage device 10, the space between the first space 401 and the second space 402 can also be used for weight adjustment, which is the significance of this configuration. is especially large.

A first space 401 is formed at a position aligned with the first weight 410 (first spacer) in the Y-axis direction (third direction), and a first space 401 is formed in a position aligned with the first weight 410 (first spacer) in the X-axis direction (first direction). Two weights 420 (second spacers) are placed. Thereby, the size and shape of the first space 401 can be adjusted by the size and shape of the first weight 410 (first spacer) and the second weight 420 (second spacer). Thereby, the first space 401 can be formed in the weight 400 (spacer) with a simple configuration.

In the above, the effect regarding the first space 401 can be similarly applied to the other spaces (second space 402, third space 403). The effect regarding the first protrusion 331 can be similarly applied to the other protrusions (second protrusion 332, third protrusion 333).

[5 Description of modification]
Although the power storage device 10 according to the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. The embodiments disclosed herein are illustrative in all respects, and the scope of the present invention includes all changes within the meaning and range equivalent to the scope of the claims.

In the above embodiment, the weight 400 that adjusts the weight of the power storage device 10 is illustrated as an example of the spacer, but instead of a weight, a spacer that does not have the function of adjusting the weight of the power storage device 10 may be used.

In the embodiment described above, the protrusions that the power storage unit 20 has (the first protrusion 331, the second protrusion 332, and the third protrusion 333 of the inner case side wall 330) are portions that include the head of the push bolt and the nut for preventing loosening. However, it is not limited to this. The protrusion may be the head of an assembly bolt for fixing each wall of the inner case 300, or any other protrusion that protrudes in the X-axis direction.

In the above embodiment, the first space 401 extends from the edge of the weight 400 to the first protrusion 331 in the Z-axis direction, but is only recessed at the position facing the first protrusion 331 in the X-axis direction. It may be in the shape of The first space 401 may not extend in the Z-axis direction across the plurality of first protrusions 331, but may have a shape that is only recessed at a position facing the plurality of first protrusions 331 in the X-axis direction. Even if the first space 401 has such a shape, the first protrusion 331 can be inserted into the first space 401 by sliding the first protrusion 331 in the X-axis direction. The same applies to the second space 402 and the third space 403.

In the above embodiment, a plurality of first protrusions 331 are arranged, but only one first protrusion 331 may be arranged. The same applies to the second protrusion 332 and the third protrusion 333. Any one of the first protrusion 331, the second protrusion 332, and the third protrusion 333 may not be arranged. In this case, among the first space 401, second space 402, and third space 403, spaces corresponding to the projections that are not arranged do not need to be arranged.

In the embodiment described above, the first space 401 into which the first projection 331 is inserted and the second space 402 into which the second projection 332 is inserted are separate and different spaces. The second space 402 may be one connected space. In other words, one space may be formed in which the first weight 412 is not placed and the first protrusion 331 and the second protrusion 332 are inserted. The same applies to the second space 402 and the third space 403.

In the above embodiment, the space such as the first space 401 is a space arranged between two first weights 410, but even if it is a space on the side of one first weight 410, good. If the first weight 411 is disposed offset from the edge of the second weight 420 in the Y-axis negative direction, a space is formed in the Y-axis negative direction of the first weight 411, so A space may be set as the first space 401 or the like. In this case, the arrangement is not limited to a plurality of first weights 410 to form a space, but only one first weight 410 is arranged, and one side of one first weight 410 in the Y-axis direction. Alternatively, one or two spaces may be formed on both sides.

In the above embodiment, the weight 400 has the first weight 410 and the second weight 420, but the first weight 410 does not have the second weight 420, and the first weight 410 is used to fill the first space 401, etc. You may also create a space. The weight 400 may be formed from a single member instead of having a plurality of separate members. In this case, an opening (a recess, a notch, a penetrating portion, etc.) that forms a space such as the first space 401 may be formed in the weight 400 as one member.

In the above embodiment, the power storage unit 20 has a protrusion that protrudes in the negative direction of the X-axis, and the weight 400 in the negative direction of the X-axis has the same configuration as the weight 400 in the positive direction of the X-axis. Good too.

In the embodiment described above, power storage device 10 may include a weight disposed along outer case side wall 113 of outer case main body 110 in place of or in addition to weight 400. In this case, the power storage unit 20 may have a protrusion that protrudes toward the weight, and the weight may form a space into which the protrusion is inserted. In addition to these weights, power storage device 10 may also include other weights such as weights arranged along outer case bottom wall 111.

In the above embodiment, the weight 400 does not need to be joined to the outer case side wall 112 by welding or the like. The weight 400 may be held between the inner case side wall 330 or 340 and the outer case side wall 112 and fixed to the outer case side wall 112.

In the embodiment described above, the inner case 300 has six walls that are constructed separately from each other, but it may have three or more walls that are constructed separately from each other. That is, in the inner case 300, any of the six walls may be integrated, or any of the walls may not be arranged. The inner case bottom wall 320 and at least one wall of the inner case side walls 330 to 360 may be integrated (formed integrally), or the inner case top wall 310 and the inner case side walls 330 to 360 may be integrated. At least one of the walls may be integrated (formed integrally). At least one of the inner case bottom wall 320 and the inner case side walls 330 to 360 may not be provided. The inner case 300 may have a bar-shaped beam or the like instead of the plate-shaped wall. Inner case 300 may include two members configured separately from each other, or may include only one member. The power storage unit 20 may have a protrusion such as the first protrusion 331 without having the inner case 300.

In the embodiment described above, the power storage device 10 is not limited to having all the configurations described above, such as that the outer case 100 may not have the outer case lid 120.

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

INDUSTRIAL APPLICATION This invention is applicable to the electrical storage device etc. which are equipped with the electrical storage unit which has electrical storage elements, such as a lithium ion secondary battery.

10 Power storage device 20 Power storage unit 100 Outer case 110 Outer case body 110a Opening 111 Outer case bottom wall 112, 113 Outer case side wall 120 Outer case lid 200 Power storage element unit group 210 Power storage element unit 211 Power storage element 212 End plate 213 Side plate 215 External terminal 300 Inner case 310 Inner case top wall 320 Inner case bottom wall 330, 340, 350, 360 Inner case side wall 331 First protrusion 332 Second protrusion 333 Third protrusion 370 Intermediate member 400 Weight 401 First space 402 Second space 403 Third space 410, 411, 412, 413, 414 First weight 420 Second weight 430 Third weight

Claims (5)

a power storage unit having a power storage element;
a spacer arranged in a first direction of the electricity storage unit,
The power storage unit has a first protrusion that protrudes in the first direction,
The spacer forms a first space into which the first protrusion is inserted. The power storage device. The power storage device according to claim 1, wherein the first space extends from an edge of the spacer to the first protrusion in a second direction intersecting the first direction. The power storage unit has a plurality of the first protrusions arranged in the second direction,
The power storage device according to claim 2, wherein the first space extends in the second direction across the plurality of first projections. The power storage unit further includes a second protrusion aligned with the first protrusion in a third direction intersecting the first direction,
The power storage device according to any one of claims 1 to 3, wherein the spacer further forms a second space into which the second protrusion is inserted. The spacer is
a first spacer aligned with the first space in a third direction intersecting the first direction;
The power storage device according to any one of claims 1 to 3, further comprising a second spacer arranged in the first direction of the first spacer.

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