JP2024039887A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device configured so that a power storage unit having a power storage element and a spacer can be easily inserted in a case.

SOLUTION: A power storage device 1 includes: a power storage unit 2 having a power storage element 300 and a spacer 400b; and a case 10 having a case body 100 with an opening 101 formed on one side in a first direction to house the power storage unit 2. The spacer 400b includes a spacer projection 430 which protrudes toward the case 10 in a second direction. The case 10 includes a case projection 122 which protrudes toward the spacer 400b in the second direction and arranged on one side of the spacer projection 430 in a third direction. At least one of the spacer projection 430 and the case projection 122 includes a first surface (spacer first surface 431a, case first surface 123a) and a second surface (spacer second surface 432a, case second surface 123b) formed closer to one side in the first direction than the first surface, in positions opposite the others. The second surface is arranged closer to one side in the third direction than the first surface.

SELECTED DRAWING: Figure 6

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a power storage device including a power storage unit having a power storage element and a spacer, and a case.

2. Description of the Related Art Conventionally, power storage devices that include a power storage unit having a power storage element and a spacer, and a case that accommodates the power storage unit are widely known. For example, Patent Document 1 discloses a power storage device module (power storage device) in which a configuration (power storage unit) having a power storage device (power storage element) and a holder (spacer) is housed in an exterior case (case).

JP2016-81761A

In the conventional power storage device described above, in which a power storage unit having a power storage element and a spacer is housed in a case, when the power storage unit is inserted into the case, the power storage unit may be tilted or misaligned with respect to the case. Insertion work may be difficult due to

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 in which a power storage unit having a power storage element and a spacer can be easily inserted into a case.

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, and a case body having an opening formed on one side in a first direction and accommodating the power storage unit. , the spacer has a spacer protrusion that protrudes toward the case in a second direction orthogonal to the first direction; the case protrudes toward the spacer in the second direction; has a case protrusion disposed on one side in a third direction perpendicular to the first direction and the second direction, and at least one of the spacer protrusion and the case protrusion is in a position facing the other. has a first surface and a second surface disposed on one side in the first direction from the first surface, and the second surface is disposed on one side in the third direction from the first surface. placed on one side.

According to the power storage device of the present invention, the power storage unit having the power storage element and the spacer can be easily inserted into the case.

FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment. FIG. 2 is an exploded perspective view showing each component when the power storage device according to the embodiment is disassembled. FIG. 1 is a perspective view showing the configuration of a power storage element according to an embodiment. It is a perspective view and a front view showing the structure of a case main body concerning an embodiment. FIG. 1 is a perspective view and a front view showing the configuration of a spacer according to an embodiment. FIG. 3 is a front view showing the configuration and positional relationship between the case protrusion of the case body and the spacer protrusion of the spacer according to the embodiment. FIG. 7 is a front view showing the configuration and positional relationship between the case protrusion of the case body and the spacer protrusion of the spacer according to Modification 1 of the embodiment. FIG. 7 is a front view showing the configuration and positional relationship between the case protrusion of the case body and the spacer protrusion of the spacer according to Modification 2 of the embodiment.

(1) A power storage device according to an embodiment of the present invention includes a power storage unit having a power storage element and a spacer, and a case body having an opening formed on one side in a first direction, and a case housing the power storage unit. and, the spacer has a spacer protrusion that protrudes toward the case in a second direction orthogonal to the first direction, and the case protrudes toward the spacer in the second direction, A case protrusion is disposed on one side of the spacer protrusion in a third direction perpendicular to the first direction and the second direction, and at least one of the spacer protrusion and the case protrusion is opposite to the other a first surface, and a second surface disposed on one side of the first direction from the first surface, the second surface facing the first surface. It is arranged on one side in the third direction.

According to the power storage device according to an embodiment of the present invention, the spacer of the power storage unit is provided with the spacer protrusion, the case is provided with the case protrusion, and the spacer protrusion and the case protrusion have at least one of the first surface. Also, the second surface on one side in the first direction is arranged on one side in the third direction rather than the first surface. Thereby, the first surface and the second surface serve as a guide when inserting the power storage unit into the case, so that it is possible to suppress the power storage unit from being tilted or misaligned with respect to the case. Therefore, the power storage unit having the power storage element and the spacer can be easily inserted into the case.

(2) In the power storage device according to (1) above, the spacer may be an end spacer disposed at an end of the power storage unit in the second direction.

According to the power storage device described in (2) above, by using the spacer having the spacer protrusion as an end spacer at the end of the power storage unit in the second direction, the end spacer allows the power storage unit to be easily attached to the case. can be positioned.

(3) In the power storage device according to (1) or (2) above, at least one of the spacer protrusion and the case protrusion is located at a position facing the other, and the further the spacer protrusion and the case protrusion, It may have an inclined surface that is inclined toward one side in the third direction, and the first surface and the second surface may be part of the inclined surface.

According to the power storage device described in (3) above, the first surface and the second surface of at least one of the spacer protrusion and the case protrusion are part of the inclined surface. As a result, by forming an inclined surface on at least one of the spacer protrusion and the case protrusion, the first and second surfaces can be arranged, making it easy to arrange the first and second surfaces on the protrusion. It can be placed in

(4) In the power storage device according to (1) or (2) above, at least one of the spacer protrusion and the case protrusion has a convex portion that protrudes toward the other, and the second surface includes: It may be the tip end surface of the convex portion.

According to the power storage device described in (4) above, a protrusion is formed on at least one of the spacer protrusion and the case protrusion, and the tip surface of the protrusion is the second surface. As a result, it is possible to suppress the thickness of at least one of the spacer protrusion and the case protrusion from increasing in the third direction over the entire first direction, thereby reducing the amount of material used and making the protrusion lightweight. It is possible to aim for

(5) In the power storage device according to any one of (1) to (4) above, at least one of the spacer and the case is located on one side of the first surface and the second surface in the third direction. , having a third surface and a fourth surface facing the other, the fourth surface being on one side in the first direction from the third surface, and the other side in the third direction from the third surface. It may be placed on the side.

According to the power storage device described in (5) above, the fourth surface of at least one of the spacer and the case, which is on one side in the first direction than the third surface, is on the other side in the third direction than the third surface. Place it in As a result, in addition to the first and second surfaces, the third and fourth surfaces also serve as guides when inserting the power storage unit into the case, so the power storage unit will not be tilted or misaligned with respect to the case. You can further suppress this.

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 a pair of terminals of a power storage element are arranged or the direction in which a pair of short sides of a container of a power storage element face each other is defined as the X-axis direction. The opposing direction of a pair of long sides of the storage element container, the thickness direction (flat direction) of the storage element or spacer, or the direction in which the storage element and spacer are arranged is defined as the Y-axis direction. The protruding direction of the terminal of the energy storage element, the alignment direction of the container body of the energy storage element and the container lid, the alignment direction of the case body and the lid of the case, the opposing direction of the opening and bottom wall of the case body, 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). 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 as the vertical direction below.

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. Hereinafter, the Z-axis direction will also be referred to as the first direction, the Y-axis direction will also be referred to as the second direction, and the X-axis direction will 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 Description of power storage device 1]
First, a schematic configuration of power storage device 1 in this embodiment will be described. FIG. 1 is a perspective view showing the appearance of a power storage device 1 according to the present embodiment. FIG. 2 is an exploded perspective view showing each component when power storage device 1 according to the present embodiment is disassembled.

The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in this embodiment. Note that the rectangular parallelepiped here is a hexahedron in which all sides are rectangular or square. The power storage device 1 is a battery module (battery assembly) used for power storage, power supply, or the like. The power storage device 1 is used as a battery for driving or starting an engine of a mobile object such as an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. . 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 1 can also be used as a stationary battery or the like used for home or business purposes.

As shown in FIG. 1 , power storage device 1 includes a case 10 . As shown in FIG. 2, inside the case 10, a power storage unit 2 having a plurality of power storage elements 300 and a plurality of spacers 400 (400a to 400d), a plurality of bus bars 600 (601 to 603), etc. are accommodated. has been done. The power storage device 1 also includes external terminals (a positive external terminal and a negative external terminal) for electrically connecting to external devices, but illustrations and descriptions thereof are omitted. In addition to the above-mentioned components, the power storage device 1 includes a restraining member (end plate, side plate, etc.) that restrains the plurality of power storage elements 300, a busbar holder that holds the busbar 600, a busbar cover, and energy discharged from the power storage elements 300. The case 10 may be provided with an exhaust section or the like for exhausting the gas to the outside of the case 10. Power storage device 1 may include electrical components such as a circuit board, a relay, a fuse, a shunt resistor, and a connector that monitor or control the charging state and discharging state of power storage element 300.

Case 10 is a substantially rectangular parallelepiped (box-shaped) container (module case) that constitutes an exterior body (casing, outer shell) of power storage device 1 . The case 10 is disposed outside the power storage unit 2 (the plurality of power storage elements 300 and the plurality of spacers 400), etc., and fixes the power storage unit 2 and the like at a predetermined position and protects the power storage unit 2 and the like from impact and the like. The case 10 is a metal case formed of a metal member such as aluminum, aluminum alloy, stainless steel, iron, or plated steel plate. In this embodiment, the case 10 is formed by casting aluminum, specifically, by die casting (aluminum die casting). The case 10 may be formed of an insulating member such as any resin material that can be used for the spacer 400 described later.

As shown in FIG. 1, the case 10 includes a case body 100 that constitutes the main body of the case 10, and a lid body 200 that constitutes the lid body of the case 10. The case body 100 is a bottomed rectangular cylindrical housing (casing) in which an opening 101 is formed in the Z-axis plus direction (one side in the first direction), and the case body 100 is a bottomed rectangular cylindrical housing (casing) in which the power storage unit 2 (a plurality of power storage elements 300 and a plurality of power storage elements 300 and spacer 400) and the like. Specifically, the case body 100 has a flat and rectangular bottom wall 110 in the negative Z-axis direction (the other side in the first direction), and a pair of flat and rectangular bottom walls on both sides in the Y-axis direction. It has a side wall 120 that is a long side wall, and has a pair of flat rectangular short side walls 130 on both sides in the X-axis direction. Depending on the configuration of the contents of the case body 100, the bottom wall 110 and the side walls 120 and 130 may have any shape, and the side wall 120 may be a short side wall and the side wall 130 may be a long side wall. A detailed explanation of the configuration of the case body 100 will be described later.

The lid body 200 is a flat rectangular member that closes the rectangular opening 101 of the case body 100. The case body 100 and the lid body 200 are joined by screwing with bolts or the like. Thereby, the case 10 has a structure in which the inside is sealed (sealed). The case body 100 and the lid body 200 may be joined by welding, adhesive, or the like. The case body 100 and the lid body 200 may be made of the same material, or may be made of different materials.

The power storage element 300 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. The power storage element 300 has a shape having a longer length in the X-axis direction than in the Y-axis direction, specifically, a rectangular parallelepiped shape (square, rectangular shape) that is flat in the Y-axis direction. In this embodiment, eight power storage elements 300 are arranged side by side in the X-axis direction and the Y-axis direction. Specifically, two power storage element rows (two sets) of four power storage elements 300 arranged in the Y-axis direction are arranged side by side in the X-axis direction. The size and shape of the power storage element 300, the number of power storage elements 300 arranged, etc. are not particularly limited, and the power storage element 300 may have an elongated cylinder shape, an elliptical cylinder shape, a cylindrical shape, a polygonal pillar shape other than a rectangular parallelepiped, etc. For example, only one power storage element 300 may be arranged. The power storage element 300 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 300 may be not a secondary battery but a primary battery that allows the user to use the stored electricity without charging it. Power storage element 300 may be a battery using a solid electrolyte. Power storage element 300 may be a pouch type power storage element. A detailed description of the configuration of power storage element 300 will be described later.

The spacer 400 is arranged in parallel with the power storage element 300 in the Y-axis direction, is flat in the Y-axis direction (flat when viewed from the X-axis direction and the Z-axis direction), and insulates and/or heats up the power storage element 300 and other members. ) is a member. The spacer 400 is an insulating plate that is arranged adjacent to the power storage element 300 in the positive Y-axis direction or the negative Y-axis direction of the power storage element 300, and insulates and/or heats the power storage elements 300 from each other or between the power storage element 300 and the case 10. Or a heat insulating board. The spacer 400 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 resin , or an insulating member such as a composite material thereof, or a member having heat insulating properties such as mica. The spacer 400 has walls on both sides of the power storage element 300 in the X-axis direction and on both sides of the Z-axis direction, so that the spacer 400 holds the power storage element 300 and also functions as a holder for positioning the power storage element 300.

Hereinafter, among the five spacers 400 in the X-axis plus direction, the spacer 400 arranged between a plurality of (two) power storage elements 300 in the Y-axis direction is also referred to as spacer 400a. Among the five spacers 400 in the positive X-axis direction, the spacers 400 arranged at both ends in the Y-axis direction (between the power storage element 300 at the end and the side wall 120 of the case 10) are also referred to as spacers 400b. In this embodiment, three spacers 400a and two spacers 400b are arranged alternately in line with four power storage elements 300, but the arrangement positions and number of spacers 400a and 400b are not particularly limited. Among the five spacers 400 in the negative X-axis direction, the spacer 400 arranged between a plurality of (two) power storage elements 300 in the Y-axis direction is also referred to as a spacer 400c. Among the five spacers 400 in the negative X-axis direction, the spacers 400 arranged at both ends in the Y-axis direction (between the power storage element 300 at the end and the side wall 120 of the case 10) are also referred to as spacers 400d. In this embodiment, three spacers 400c and two spacers 400d are arranged alternately in line with four power storage elements 300, but the arrangement positions and number of spacers 400c and 400d are not particularly limited.

Specifically, the spacer 400a has walls on both sides in the X-axis direction and both sides in the Z-axis direction of two power storage elements 300 arranged on both sides of the spacer 400a in the Y-axis direction, and holds the two power storage elements 300. do. In this way, spacer 400a is an intermediate spacer (intermediate holder) placed between two power storage elements 300. The same applies to the spacer 400c. Spacer 400b has walls on both sides in the X-axis direction and on both sides in the Z-axis direction of one power storage element 300 disposed on one side of spacer 400b in the Y-axis direction, and holds the one power storage element 300. In this way, spacer 400b is an end spacer (end holder) arranged at the end of power storage unit 2 in the Y-axis direction (second direction). The same applies to the spacer 400d.

In other words, among the four energy storage elements 300 in the positive X-axis direction, the energy storage element 300 located at the end in the Y-axis direction is held by the spacer 400a and the spacer 400b, and the other energy storage elements 300 are held by the two spacers 400a. Retained. Among the four power storage elements 300 in the negative X-axis direction, the power storage element 300 located at the end in the Y-axis direction is held by a spacer 400c and a spacer 400d, and the other power storage elements 300 are held by two spacers 400c. Ru. All the spacers 400 (400a to 400d) may be made of the same material, or any of the spacers 400 may be made of different materials. A detailed description of the configuration of the spacer 400 (particularly the spacers 400b and 400d) will be described later.

Bus bar 600 is a plate-shaped member connected to power storage element 300. Bus bar 600 is arranged above the plurality of power storage elements 300 and is connected (joined) to terminals 340 that the plurality of power storage elements 300 have. Specifically, bus bar 600 connects terminals 340 of a plurality of power storage elements 300 to each other, and electrically connects terminals 340 of power storage elements 300 at the ends to an external terminal (not shown). In this embodiment, five bus bars 600 connect two power storage elements 300 in parallel to form four sets of power storage element groups, and connect the four sets of power storage element groups in series. Specifically, among the five bus bars 600, the bus bar 601 in the X-axis positive direction connects two sets of power storage element groups in the X-axis positive direction in series, and the bus bar 601 in the X-axis negative direction connects the X-axis negative direction in series. Two sets of power storage element groups in different directions are connected in series. A bus bar 602 located at the center in the X-axis direction and in the negative Y-axis direction connects in series two sets of power storage element groups in the negative Y-axis direction. Two bus bars 603 located at the center in the X-axis direction and in the Y-axis positive direction connect two sets of power storage element groups in the Y-axis positive direction and a pair (positive electrode and negative electrode) of external terminals (not shown) to other bus bars, etc. Connect each via.

The connection form of the bus bar 600 is not particularly limited, and a plurality of power storage elements 300 may be connected in series or in parallel in any combination, or all power storage elements 300 may be connected in series or in parallel. It's okay. The bus bar 600 and the terminal 340 are connected (joined) by welding or the like, but the connection form is not particularly limited. The bus bar 600 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.

[2 Description of power storage element 300]
Next, the configuration of power storage element 300 will be described in detail. FIG. 3 is a perspective view showing the configuration of power storage element 300 according to this embodiment. FIG. 3 shows an enlarged view of the power storage element 300 shown in FIG. Since the plurality of power storage elements 300 included in power storage device 1 all have the same configuration, one power storage element 300 is shown in FIG. 3, and the configuration of one power storage element 300 will be described in detail below.

As shown in FIG. 3, the power storage element 300 includes a container 310, a pair of terminals 340 (positive electrode and negative electrode), and a pair of gaskets 350 (positive electrode and negative electrode). Inside the container 310, 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 housed, but illustration thereof is omitted. The type of electrolytic solution is not particularly limited as long as it does not impair the performance of power storage element 300, and various types can be selected. In addition to the above-mentioned components, the power storage element 300 includes a spacer placed on the side or below the electrode body, an insulating film that wraps around the electrode body, or an insulating film (such as a shrink tube) that covers the outer surface of the container 310. It may have.

The container 310 is a rectangular parallelepiped-shaped (prismatic or box-shaped) case that includes a container body 320 with an opening and a container lid 330 that closes the opening of the container body 320. The container main body 320 is a rectangular cylindrical member having a bottom and forming the main body of the container 310, and has an opening formed in the positive Z-axis direction. The container lid portion 330 is a rectangular plate-like member that is long in the X-axis direction and constitutes the lid portion of the container 310, and is arranged in the positive Z-axis direction of the container body portion 320. The container lid part 330 includes a gas discharge valve 331 that releases the pressure inside the container 310 when the pressure rises excessively, and a liquid injection part (Fig. (not shown) etc. are provided. The material of the container 310 (container main body 320 and container lid 330) is not particularly limited, and may be a weldable (joinable) metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate. Resins can also be used.

The container 310 has a structure in which the inside is hermetically sealed by accommodating the electrode body and the like inside the container body 320 and then joining the container body 320 and the container lid 330 by welding or the like. ing. The container 310 has a pair of long sides 311 on both sides in the Y-axis direction, a pair of short sides 312 on both sides in the X-axis direction, and a bottom surface 313 on the negative side in the Z-axis direction. The long side surface 311 is a rectangular planar part that forms the long side surface of the container 310, and is arranged to face the adjacent spacer 400 in the Y-axis direction. The long side surface 311 is adjacent to the short side surface 312 and the bottom surface 313 and has a larger area than the short side surface 312. The short side surface 312 is a rectangular planar portion that forms the short side surface of the container 310, and is arranged to face the wall of the spacer 400 and the side wall 130 of the case 10 in the X-axis direction. The short side 312 is adjacent to the long side 311 and the bottom 313 and has a smaller area than the long side 311. The bottom surface 313 is a rectangular flat surface that forms the bottom surface of the container 310, and is arranged to face the wall of the spacer 400 and the bottom wall 110 of the case 10 in the Z-axis direction. Bottom surface 313 is disposed adjacent to long side 311 and short side 312.

Terminal 340 is a terminal member (a positive electrode terminal and a negative electrode terminal) of power storage element 300 that is arranged on container lid 330. Specifically, the terminal 340 is arranged so as to protrude from the upper surface (terminal arrangement surface) of the container lid 330 in the positive Z-axis direction. The terminal 340 is electrically connected to the positive electrode plate and the negative electrode plate of the electrode body via the current collector. In other words, the terminal 340 is made of metal for leading the electricity stored in the electrode body to the external space of the electricity storage element 300 and for introducing electricity into the internal space of the electricity storage element 300 to store electricity in the electrode body. It is a member of The terminal 340 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.

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. The positive electrode plate has a positive electrode active material layer formed on a positive electrode base material layer, which is a current collector foil made of metal such as aluminum or an aluminum alloy. The negative electrode plate has a negative electrode active material layer formed on a negative electrode base material layer which is a current collecting foil made of metal such as copper or copper alloy. As the active material used for the positive electrode active material layer and the negative electrode active material layer, any known material can be used as appropriate as long as it is capable of intercalating and deintercalating lithium ions. As the separator, a microporous sheet made of resin, a nonwoven fabric, or the like can be used. In this embodiment, the electrode body is formed by stacking electrode plates (a positive electrode plate and a negative electrode plate) in the Y-axis direction. The electrode body is a wound type electrode body formed by winding electrode plates (positive electrode plate and negative electrode plate), and a laminated type (stack type) electrode formed by laminating multiple flat electrode plates. The electrode body may be in any form, such as a bellows-shaped electrode body in which a body or an electrode plate is folded into a bellows shape.

The current collector is a conductive current collecting member (a positive electrode current collector and a negative electrode current collector) that is electrically connected to the terminal 340 and the electrode body. The positive electrode current collector is made of aluminum or aluminum alloy, etc., like the positive electrode base material layer of the positive electrode plate of the electrode body, and the negative electrode current collector is made of copper or copper, like the negative electrode base material layer of the negative electrode plate of the electrode body. It is made of alloy, etc. Gasket 350 is a gasket that is disposed between container lid 330, terminal 340, and current collector, and insulates between container lid 330, terminal 340, and current collector. Gasket 350 may be made of any material as long as it has insulating properties.

[3 Description of case body 100 and spacer 400]
Next, the configurations of the case body 100 and the spacer 400 will be described in detail. Specifically, the configuration of the case body 100 and the spacer 400b and the positional relationship between the case body 100 and the spacer 400b will be described in detail. FIG. 4 is a perspective view and a front view showing the configuration of the case body 100 according to the present embodiment. Specifically, FIG. 4(a) is an enlarged perspective view of the case body 100 shown in FIG. 2. As shown in FIG. FIG. 4B is a front view showing the configuration of the case protrusion 122 provided on the side wall 120 of the case body 100 when viewed from the negative Y-axis direction. In FIG. 4(b), the bottom wall 110 of the case body 100 is shown in a cross-sectional view. Although FIG. 4 shows the case protrusion 122 provided on the side wall 120 in the Y-axis positive direction among the pair of side walls 120 of the case body 100, the side wall 120 in the Y-axis negative direction also has a similar configuration. A case protrusion 122 is provided.

FIG. 5 is a perspective view and a front view showing the configuration of a spacer 400b according to this embodiment. Specifically, FIG. 5A is an enlarged perspective view showing the spacer 400b in the negative Y-axis direction, of the pair of spacers 400b shown in FIG. FIG. 5B is a front view showing the configuration of the spacer protrusion 430 of the spacer 400b shown in FIG. 5A when viewed from the negative Y-axis direction. Of the pair of spacers 400b, the spacer 400b in the negative Y-axis direction and the spacer 400b in the positive Y-axis direction have shapes that are symmetrical in the Y-axis direction (symmetrical with respect to a plane parallel to the XZ plane). . The spacer 400d has a shape that is symmetrical to the spacer 400b in the X-axis direction (symmetrical to a plane parallel to the YZ plane), or a shape that is obtained by rotating the spacer 400b by 180 degrees around the Z-axis. Therefore, although the spacer 400b in the negative direction of the Y-axis will be described in detail below, the same applies to the spacer 400b and the spacer 400d in the positive direction of the Y-axis.

FIG. 6 is a front view showing the configuration and positional relationship between the case protrusion 122 of the case body 100 and the spacer protrusion 430 of the spacer 400b according to the present embodiment. FIG. 6 shows the case protrusion 122 provided on the side wall 120 in the negative Y-axis direction among the pair of side walls 120 of the case body 100, and the spacer protrusion 430 of the spacer 400b in the negative Y-axis direction. In FIG. 6, the case body 100 is shown in a cross-sectional view. Two case protrusions 122 arranged in the X-axis direction are provided on the side wall 120. The case protrusion 122 in the X-axis minus direction corresponds to the spacer 400d, and the case protrusion 122 in the X-axis plus direction corresponds to the spacer 400b. handle. For this reason, FIG. 6 shows the case protrusion 122 in the positive direction of the X-axis.

As shown in FIG. 4, the case body 100 has a bottom wall 110, a pair of side walls 120, and a pair of side walls 130, as described above. The pair of side walls 120 have a similar configuration, and a recess 121 is formed in each of the pair of side walls 120, and a case protrusion 122 is provided in the recess 121.

Specifically, a recessed portion recessed in the Y-axis positive direction extends in the Z-axis direction from one end of the side wall 120 in the Z-axis direction to the other end of the side wall 120 in the X-axis direction. 121 is formed. Within the recess 121, two case protrusions 122 are provided extending from the edge of the recess 121 in the negative Z-axis direction to the center of the recess 121 in the Z-axis direction. The case protrusion 122 is a protruding portion that protrudes from the side wall 120 in the Y-axis positive direction in the Y-axis negative direction and extends in the Z-axis positive direction from the bottom wall 110 to the center of the side wall 120 in the Z-axis direction. It is. Since the side wall 120 is disposed facing the spacer 400b in the Y-axis direction, the case protrusion 122 is disposed to protrude toward the spacer 400b in the Y-axis direction (second direction). In this embodiment, case protrusion 122 has a substantially triangular shape that is long in the Z-axis direction when viewed from the Y-axis direction.

Similarly, in the center of the side wall 120 in the negative Y-axis direction in the X-axis direction, there is a recess 121 that is recessed in the negative Y-axis direction and extends in the Z-axis direction from one end to the other end of the side wall 120 in the Z-axis direction. It is formed. Within the recess 121, two case protrusions 122 (not shown in FIG. 4, shown in FIG. (one case protrusion 122 shown) is provided. The case protrusion 122 has the same configuration as the case protrusion 122 provided on the side wall 120 in the positive Y-axis direction, such as being arranged to protrude toward the spacer 400b in the Y-axis direction (second direction). , detailed explanation will be omitted.

As shown in FIG. 5, the spacer 400b includes a spacer body 410, a spacer wall 420, and a spacer protrusion 430. The spacer main body 410 is a flat and rectangular portion that constitutes the main body of the spacer 400b, and is arranged parallel to the XZ plane. Spacer main body 410 is arranged facing power storage element 300 in the Y-axis direction. In this embodiment, spacer main body 410 is formed to have substantially the same shape and size as container 310 of power storage element 300 when viewed from the Y-axis direction. Thereby, spacer main body 410 is arranged in the negative Y-axis direction of long side surface 311 so as to cover the entire surface of long side surface 311 of container 310 of power storage element 300 . The spacer body 410 is placed in contact with the inner surface of the side wall 120 of the case body 100.

Spacer wall portions 420 are the top wall, bottom wall, and side wall of spacer 400b, which are arranged on both sides of power storage element 300 in the Z-axis direction and on both sides of X-axis direction. The spacer wall portion 420 is an annular (quadrangular ring-shaped) flat plate-like wall that protrudes from both ends of the spacer body 410 in the Z-axis direction and both ends of the X-axis direction in the Y-axis positive direction. In other words, the spacer wall 420 includes a wall of the container lid 330 of the power storage element 300 arranged in the Z-axis positive direction, a wall of the bottom surface 313 of the container 310 of the power storage element 300 arranged in the Z-axis negative direction, and a wall of the container lid 330 of the power storage element 300 arranged in the Z-axis negative direction. 310 and two walls arranged on both sides of the pair of short sides 312 in the X-axis direction. In this way, spacer wall portion 420 is arranged to surround both sides of power storage element 300 in the Z-axis direction and both sides of power storage element 300 in the X-axis direction, and holds power storage element 300 .

The spacer protrusion 430 is a portion that protrudes from the spacer body 410 in the Y-axis direction. Specifically, the spacer protrusion 430 protrudes from the end of the spacer body 410 in the negative X-axis direction in the negative direction of the Y-axis, and extends from one end of the spacer body 410 in the Z-axis direction to the other end in the Z-axis direction. It is a protruding part that extends to . Since the spacer 400b is disposed facing the side wall 120 of the case body 100 of the case 10 in the Y-axis direction, the spacer protrusion 430 is placed in the case 10 in the Y-axis direction (second direction perpendicular to the first direction). protrude towards. Specifically, the spacer protrusion 430 protrudes toward the recess 121 of the side wall 120 in the negative Y-axis direction, and at least the end in the negative Y-axis direction is disposed within the recess 121 . The recessed portion 121 has an inner surface facing in the positive direction of the Y-axis, which is an inclined surface that slopes toward the negative direction of the Y-axis as it goes toward the positive direction of the Z-axis. Therefore, the spacer protrusion 430 protrudes more in the Y-axis minus direction along the inner surface of the recess 121 as it goes in the Z-axis plus direction. Although the spacer protrusion 430 may contact the inner surface of the recess 121, in this embodiment, it is arranged apart from the inner surface of the recess 121.

The spacer protrusion 430 has a plurality of concave portions recessed in the positive direction of the Y-axis, which are lined up in the X-axis direction and the Z-axis direction. It has a built-in structure. The spacer protrusion 430 has two protrusions, a first spacer protrusion 431 and a second spacer protrusion, which are arranged in the X-axis direction at approximately half the center in the X-axis direction of the spacer protrusion 430 in the Z-axis minus direction. It has a section 433. The first spacer protrusion 431 and the second spacer protrusion 433 protrude from the spacer body 410 in the Y-axis minus direction, and extend from the end of the spacer body 410 in the Z-axis minus direction to the center in the Z-axis direction. It is a flat plate-shaped part extending parallel to the YZ plane.

The first spacer protrusion 431 has a first spacer protrusion 432 that protrudes in the X-axis plus direction at the center in the Z-axis direction. The first spacer protrusion 432 is a protrusion (rib) that protrudes toward the second spacer protrusion 433 and extends from the end of the first spacer protrusion 431 in the Y-axis minus direction in the Y-axis plus direction. The second spacer protrusion 433 has a second spacer protrusion 434 that protrudes in the negative X-axis direction at the center in the Z-axis direction. The second spacer protrusion 434 is a protrusion (rib) that protrudes toward the first spacer protrusion 431 and extends from the end of the second spacer protrusion 433 in the Y-axis minus direction in the Y-axis plus direction. The first spacer convex portion 432 and the second spacer convex portion 434 are arranged to face each other in the X-axis direction and protrude toward each other.

In such a configuration, as shown in FIG. 6, the case protrusion 122 is inserted between the first spacer protrusion 431 and the second spacer protrusion 433 of the spacer protrusion 430. In this embodiment, in order to facilitate insertion of the case protrusion 122, the first spacer protrusion 432 of the first spacer protrusion 431 has a corner portion located at the end in the negative direction of the Z-axis and the end in the positive direction of the X-axis. has a curved shape. Similarly, the second spacer convex portion 434 of the second spacer protrusion 433 has a curved corner at the end in the negative Z-axis direction and the negative end in the X-axis direction. As a result, the case protrusion 122 is adjacent to the first spacer protrusion 431 and the second spacer protrusion 433 of the spacer protrusion 430 in the X-axis direction (third direction perpendicular to the first direction and the second direction). will be placed. Specifically, the case protrusion 122 is arranged in the X-axis positive direction (one side in the third direction) of the first spacer protrusion 431, and in the X-axis minus direction (one side in the third direction) of the second spacer protrusion 433. on the other side).

The first spacer protrusion 431 has a spacer first surface 431a at a position facing the case protrusion 122, and a spacer second surface disposed in the Z-axis plus direction (one side in the first direction) than the spacer first surface 431a. It has two surfaces 432a. The spacer second surface 432a is arranged in the X-axis plus direction (one side in the third direction) than the spacer first surface 431a. The first spacer convex portion 432 is arranged to protrude in the X-axis positive direction toward the case protrusion 122, and the spacer second surface 432a is the distal end surface (the end surface in the X-axis positive direction) of the first spacer convex portion 432. ). The spacer first surface 431a is a surface of the side surface of the first spacer protrusion 431 in the X-axis positive direction that is located closer to the end in the Z-axis negative direction than the spacer second surface 432a. In this embodiment, the spacer first surface 431a is located at the end of the first spacer protrusion 431 in the negative Z-axis direction, and the spacer second surface 432a is located at the center of the first spacer protrusion 431 in the Z-axis direction. To position. A convex portion may also be formed at the position of the spacer first surface 431a of the first spacer protrusion 431, and the spacer first surface 431a may be the tip surface of the convex portion.

The case protrusion 122 has a case first surface 123a at a position facing the first spacer protrusion 431, and a case third disposed in the Z-axis plus direction (one side in the first direction) relative to the case first surface 123a. It has two surfaces 123b. The second case surface 123b is arranged in the X-axis plus direction (one side in the third direction) than the first case surface 123a. In this embodiment, case protrusion 122 has first case inclined surface 123 at a position facing first spacer protrusion 431 . The first case inclined surface 123 is a side surface of the case protrusion 122 in the X-axis negative direction, and increases in the X-axis positive direction (one side in the third direction) as it goes in the Z-axis positive direction (one side in the first direction). It is a sloped surface.

The first case surface 123a and the second case surface 123b are part of the first case inclined surface 123. In this embodiment, the case first surface 123a is arranged in the Z-axis minus direction from the center position of the first case inclined surface 123 in the Z-axis direction, and the case second surface 123b is arranged in the Z-axis direction from the center position of the first case inclined surface 123. It is arranged in the Z-axis plus direction from the center position in the Z-axis direction. The case first surface 123a and the case second surface 123b are arranged at positions facing the spacer first surface 431a and the spacer second surface 432a, respectively. In FIG. 6, the case first surface 123a and the case second surface 123b are arranged apart from the spacer first surface 431a and the spacer second surface 432a, but the spacer first surface 431a and the spacer second surface 432a are arranged separately. They may be placed in contact.

In this way, at least one of the spacer protrusion 430 and the case protrusion 122 has a first surface (spacer first surface 431a, case first surface 123a) at a position facing the other, and a Z-axis It has a second surface (spacer second surface 432a, case second surface 123b) arranged in the positive direction (one side in the first direction). The second surface (spacer second surface 432a, case second surface 123b) is arranged in the X-axis plus direction (one side in the third direction) than the first surface (spacer first surface 431a, case first surface 123a). has been done. At least one of the spacer protrusion 430 and the case protrusion 122 (in this embodiment, the spacer protrusion 430) has a protrusion (first spacer protrusion 432) that protrudes toward the other (case protrusion 122). are doing. The second surface (second spacer surface 432a) is the tip end surface of the convex portion (first spacer convex portion 432). At least one of the spacer protrusion 430 and the case protrusion 122 (in this embodiment, the case protrusion 122) is located at a position facing the other (spacer protrusion 430) in the Z-axis plus direction (one side in the first direction). ) has a slope (first case slope 123) that slopes in the X-axis plus direction (one side in the third direction). The first surface and the second surface (the first case surface 123a and the second case surface 123b) are part of the inclined surface (the first case inclined surface 123).

The positions of the first surface and the second surface in the Z-axis direction are not particularly limited, and are two surfaces lined up in the Z-axis direction when the first spacer protrusion 431 or the case protrusion 122 is divided into multiple parts in the Z-axis direction. . That is, the first case surface 123a and the second case surface 123b are two surfaces lined up in the Z-axis direction when the first case inclined surface 123 is divided into a plurality of parts in the Z-axis direction. When the first case inclined surface 123 is divided into two in the Z-axis direction, the first case surface 123a is arranged on the surface in the negative direction of the Z-axis, and the second case surface 123b is arranged on the surface in the positive direction of the Z-axis. . When the first case inclined surface 123 is divided into three parts in the Z-axis direction, the case first surface 123a is arranged at the end in the negative Z-axis direction or the center part in the Z-axis direction; The case second surface 123b is disposed on a surface in the Z-axis plus direction relative to the surface. That is, when the first case surface 123a is arranged on the surface of the end in the negative Z-axis direction, the second case surface 123b is arranged on the surface of the central part in the Z-axis direction or the end in the positive Z-axis direction. When the first case surface 123a is arranged on the surface at the center in the Z-axis direction, the second case surface 123b is arranged on the surface at the end in the positive Z-axis direction.

The second spacer protrusion 433 has a spacer third surface 433a at a position facing the case protrusion 122, and a spacer third surface 433a disposed in the Z-axis plus direction (one side in the first direction) than the spacer third surface 433a. It has four sides 434a. The spacer third surface 433a and the spacer fourth surface 434a are arranged in the X-axis plus direction (one side in the third direction) of the spacer first surface 431a and the spacer second surface 432a, respectively. The spacer fourth surface 434a is arranged in the X-axis minus direction (the other side in the third direction) than the spacer third surface 433a. The second spacer convex portion 434 is arranged to protrude in the X-axis negative direction toward the case protrusion 122, and the spacer fourth surface 434a is the distal end surface (the end surface in the X-axis negative direction) of the second spacer convex portion 434. ). The spacer third surface 433a is a surface of the side surfaces of the second spacer protrusion 433 in the X-axis negative direction that is located closer to the end in the Z-axis negative direction than the spacer fourth surface 434a. In this embodiment, the spacer third surface 433a is located at the end of the second spacer protrusion 433 in the Z-axis negative direction, and the spacer fourth surface 434a is located at the center of the second spacer protrusion 433 in the Z-axis direction. To position. A convex portion may also be formed at the position of the spacer third surface 433a of the second spacer protrusion 433, and the spacer third surface 433a may be the tip end surface of the convex portion.

The case protrusion 122 has a case third surface 124a at a position facing the second spacer protrusion 433, and a case third surface disposed in the Z-axis plus direction (one side in the first direction) relative to the case third surface 124a. It has four sides 124b. The third case surface 124a and the fourth case surface 124b are arranged in the X-axis plus direction (one side in the third direction) of the first case surface 123a and the second case surface 123b, respectively. The fourth case surface 124b is arranged in the X-axis minus direction (the other side in the third direction) than the third case surface 124a. In this embodiment, case protrusion 122 has second case inclined surface 124 at a position facing second spacer protrusion 433 . The second case inclined surface 124 is a side surface of the case protrusion 122 in the X-axis positive direction, and increases in the X-axis negative direction (the other side in the third direction) as it goes in the Z-axis positive direction (one side in the first direction). It is a sloped surface.

The third case surface 124a and the fourth case surface 124b are part of the second case inclined surface 124. In the present embodiment, the third case surface 124a is arranged in the Z-axis minus direction from the center position of the second case inclined surface 124 in the Z-axis direction, and the fourth case surface 124b is arranged in the Z-axis negative direction from the center position of the second case inclined surface 124. It is arranged in the Z-axis plus direction from the center position in the Z-axis direction. The third case surface 124a and the fourth case surface 124b are arranged at positions facing the third spacer surface 433a and the fourth spacer surface 434a, respectively. In FIG. 6, the case third surface 124a and the case fourth surface 124b are arranged apart from the spacer third surface 433a and the spacer fourth surface 434a, but are spaced apart from the spacer third surface 433a and the spacer fourth surface 434a. They may be placed in contact.

In this way, at least one of the spacer 400b and the case 10 has a third surface and a fourth surface facing the other in the X-axis plus direction (one side in the third direction) of the first and second surfaces. ing. Specifically, at least one of the spacer protrusion 430 and the case protrusion 122 has a third surface (spacer third surface 433a, case third surface 124a) at a position facing the other, and a Z It has a fourth surface (spacer fourth surface 434a, case fourth surface 124b) arranged in the axial positive direction (one side in the first direction). The fourth surface (spacer fourth surface 434a, case fourth surface 124b) is arranged in the negative X-axis direction (the other side in the third direction) than the third surface (spacer third surface 433a, case third surface 124a). has been done. At least one of the spacer protrusion 430 and the case protrusion 122 (in this embodiment, the spacer protrusion 430) has a protrusion (second spacer protrusion 434) that protrudes toward the other (case protrusion 122). are doing. The fourth surface (spacer fourth surface 434a) is the tip end surface of the convex portion (second spacer convex portion 434). At least one of the spacer protrusion 430 and the case protrusion 122 (in this embodiment, the case protrusion 122) is located at a position facing the other (spacer protrusion 430) in the Z-axis plus direction (one side in the first direction). ) has an inclined surface (second case inclined surface 124) that is inclined in the X-axis minus direction (the other side in the third direction). The third surface and the fourth surface (third case surface 124a and fourth case surface 124b) are part of the inclined surface (second case inclined surface 124).

The positions of the third surface and the fourth surface in the Z-axis direction are not particularly limited, and are two surfaces lined up in the Z-axis direction when the second spacer protrusion 433 or the case protrusion 122 is divided into multiple parts in the Z-axis direction. . The details are the same as those for the first and second pages. In this embodiment, the third surface and the fourth surface are arranged at the same position as the first and second surfaces in the Z-axis direction, but are arranged at different positions from the first and second surfaces. may be done.

[4 Explanation of effects]
As described above, according to the power storage device 1 according to the present embodiment, the spacer protrusion 430 is provided on the spacer 400b of the power storage unit 2, and the case protrusion 122 is provided on the case 10. At least one of the spacer protruding portion 430 and the case protruding portion 122 has a second surface ( The spacer second surface 432a and the case second surface 123b) are arranged in the X-axis plus direction (on one side in the third direction) relative to the first surface. As a result, the first surface (spacer first surface 431a, case first surface 123a) and second surface (spacer second surface 432a, case second surface 123b) serve as guides when inserting power storage unit 2 into case 10. becomes. Therefore, it is possible to suppress the power storage unit 2 from being tilted or misaligned with respect to the case 10. Therefore, the power storage unit 2 having the power storage element 300 and the spacer 400b can be easily inserted into the case 10.

By using spacer 400b having spacer protrusion 430 as an end spacer at the end of power storage unit 2 in the Y-axis direction (second direction), power storage unit 2 can be easily positioned with respect to case 10 by the end spacer. . In particular, when inserting the power storage unit 2 into the case 10, the spacer 400b, which is an end spacer, is inserted while being in contact with the case 10. Therefore, when positioning power storage unit 2 using spacer 400a, which is an intermediate spacer, both spacers 400a and 400b are inserted while contacting case 10, making the insertion work difficult. Thereby, the power storage unit 2 can be easily inserted into the case 10 by positioning the power storage unit 2 with the spacer 400b. Furthermore, when inserting the power storage unit 2 into the case 10, the power storage unit 2 tends to tilt in the X-axis direction or become misaligned; however, the spacer 400b prevents the power storage unit 2 from tilting in the It is possible to suppress the occurrence of positional shift. Since the power storage unit 2 is prone to misalignment at the end, the power storage unit 2 can be easily positioned with respect to the case 10 by positioning the power storage unit 2 using the spacer 400b, which is an end spacer at the end of the power storage unit 2. can.

The first surface and the second surface (the first case surface 123a and the second case surface 123b) of at least one of the spacer protrusion 430 and the case protrusion 122 (in this embodiment, the case protrusion 122) are inclined surfaces. (first case inclined surface 123). As a result, by forming the first case inclined surface 123 on the case protrusion 122, the first case surface 123a and the second case surface 123b can be arranged. The surface 123b can be easily arranged. By forming the first case inclined surface 123 on the case protrusion 122 using the draft angle during manufacturing, the first case surface 123a and the second case surface 123b can be easily arranged.

A convex portion (first spacer convex portion 432) is formed on at least one of the spacer protruding portion 430 and the case protruding portion 122 (in this embodiment, the spacer protruding portion 430), and the tip end surface of the convex portion is formed on the second surface (the spacer protruding portion 432). Second surface 432a). This makes it possible to suppress the thickness of the first spacer protrusion 431 of the spacer protrusion 430 from increasing in the X-axis direction (third direction) over the entire Z-axis direction (first direction). It is possible to reduce the amount of material used and the weight of 430 (first spacer protrusion 431).

At least one of the spacer 400b and the case 10 has a fourth surface (spacer fourth surface) that is located in the Z-axis plus direction (one side in the first direction) than the third surface (spacer third surface 433a, case third surface 124a). 434a and case fourth surface 124b) are arranged in the X-axis minus direction (on the other side in the third direction) than the third surface. As a result, in addition to the first and second surfaces described above, the third surface (spacer third surface 433a, case third surface 124a) and fourth surface (spacer fourth surface 434a, case fourth surface 124b) are also , serves as a guide when inserting the power storage unit 2 into the case 10. Therefore, it is possible to further suppress the power storage unit 2 from being tilted or misaligned with respect to the case 10.

In the above description, the effects regarding the first and second surfaces can be similarly applied to the third and fourth surfaces. The effect of the spacer 400b in the negative direction of the Y-axis can be similarly applied to the spacer 400b in the positive direction of the Y-axis. The effect of spacer 400b can be similarly applied to spacer 400d.

[5 Description of modification]
Although the power storage device 1 according to the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. The embodiments disclosed this time are illustrative in all respects, and the scope of the present invention includes all changes within the meaning and range equivalent to the scope of the claims.

(Modification 1)
In the above embodiment, the case protrusion 122 is not limited to having an inclined surface (first case inclined surface 123, second case inclined surface 124). FIG. 7 is a front view showing the configuration and positional relationship between the case protrusion 122A of the case body 100 and the spacer protrusion 430 of the spacer 400b according to Modification 1 of the present embodiment. FIG. 7 is a diagram corresponding to FIG. 6.

As shown in FIG. 7, the case protrusion 122A in this modification has a first case stepped surface instead of the first case inclined surface 123 and the second case inclined surface 124 of the case protruded section 122 in the above embodiment. 123A and a second case step surface 124A. The first case step surface 123A is a step-like (step-like) surface that is recessed in the X-axis positive direction as it goes in the Z-axis positive direction. The first case surface 123a and the second case surface 123b are part of the first case stepped surface 123A. The case first surface 123a and the case second surface 123b are two surfaces formed by the step of the first case step surface 123A and are located at different positions in the X-axis direction (opposed to the spacer first surface 431a and the spacer second surface 432a). It is the aspect of The second case step surface 124A is a step-like (step-like) surface that is recessed in the X-axis minus direction as it goes in the Z-axis plus direction. The third case surface 124a and the fourth case surface 124b are part of the second case stepped surface 124A. The third case surface 124a and the fourth case surface 124b are two surfaces formed by the step of the second case step surface 124A and have different positions in the X-axis direction (opposed to the spacer third surface 433a and the spacer fourth surface 434a). It is the aspect of The other configurations of this modification are the same as those of the above embodiment, so detailed explanations will be omitted.

(Modification 2)
In the embodiment described above, the spacer protrusion 430 is not limited to having a protrusion (the first spacer protrusion 432 of the first spacer protrusion 431 and the second spacer protrusion 434 of the second spacer protrusion 433). . FIG. 8 is a front view showing the configuration and positional relationship between the case protrusion 122 of the case body 100 and the spacer protrusion 430A of the spacer 400b according to Modification 2 of the present embodiment. FIG. 8 is a diagram corresponding to FIG. 6.

As shown in FIG. 8, the spacer protrusion 430A in this modification includes a first spacer protrusion 431A and a second spacer protrusion 433A. The first spacer protrusion 431A does not have the first spacer protrusion 432 in the above embodiment, but has an inclined surface on the side surface in the X-axis positive direction that slopes in the X-axis positive direction as it moves toward the Z-axis positive direction. It has a first spacer inclined surface 431B. The first spacer surface 431a and the second spacer surface 432a are part of the first spacer inclined surface 431B. The second spacer protrusion 433A does not have the second spacer protrusion 434 in the above embodiment, but has an inclined surface on the side surface in the negative X-axis direction that slopes in the negative direction of the X-axis as it moves toward the positive direction of the Z-axis. It has a second spacer inclined surface 433B. The third spacer surface 433a and the fourth spacer surface 434a are part of the second spacer inclined surface 433B. The other configurations of this modification are the same as those of the above embodiment, so detailed explanations will be omitted.

As described above, the power storage devices according to Modifications 1 and 2 can provide the same effects as the embodiments described above. Like Modifications 1 and 2 above, the case protrusion 122 and the spacer protrusion 430 (the first spacer protrusion 431 and the second spacer protrusion 433) in the embodiment described above can take various shapes. The case protrusion 122 may have a protrusion like the first spacer protrusion 431 and the second spacer protrusion 433. The first spacer protrusion 431 and the second spacer protrusion 433 may have stepped side surfaces similarly to the case protrusion 122A. The inclined surface of the case protrusion 122 in the above embodiment and the inclined surfaces of the first spacer protrusion 431A and the second spacer protrusion 433A in the second modification are not planar inclined surfaces but curved surfaces. It may include a curved inclined surface.

(Other variations)
In the above embodiment, the spacer protrusion 430 is provided on the spacer 400b and the spacer 400d, but it may be provided on the spacer 400a or the spacer 400c. In this case, the case protrusion 122 may be provided on the side wall 130 of the case 10.

In the above embodiment, the spacer protrusion 430 protrudes in the Y-axis minus direction from the X-axis minus direction end of the spacer body 410 of the spacer 400b. It may protrude from the plus direction end. In this case, the case protrusion 122 is arranged at a position corresponding to the spacer protrusion 430. The spacer protrusion 430 may protrude in a direction slightly inclined from the Y-axis direction or in the X-axis direction. In this case, a direction slightly inclined from the Y-axis direction or an X-axis direction may be defined as the second direction. The same applies to the direction in which the case protrusion 122 protrudes.

In the above embodiment, the spacer protrusion 430 has two protrusions (the first spacer protrusion 431 and the second spacer protrusion 433), and the case protrusion 122 is inserted between the two protrusions. However, it is not limited to this. The spacer protrusion 430 does not need to have either of the two protrusions. When the spacer protrusion 430 does not have the second spacer protrusion 433, the case protrusion 122 does not need to have the third case surface 124a and the fourth case surface 124b. Similarly, when the spacer protrusion 430 does not have the first spacer protrusion 431, the case protrusion 122 does not need to have the first case surface 123a and the second case surface 123b. In this case, the third and fourth surfaces of the spacer protrusion 430 and the case protrusion 122 are referred to as the first and second surfaces, and the negative X-axis direction is referred to as one side of the third direction. The spacer protrusion 430 may be inserted between two protrusions of the case protrusion 122.

In the above embodiment, the case protrusion 122 is arranged at the end of the side wall 120 of the case body 100 in the Z-axis negative direction, but it is arranged at the center of the side wall 120 in the Z-axis direction or at the end in the Z-axis positive direction. may be placed. In this case, the spacer protrusion 430 is arranged at a position corresponding to the case protrusion 122. Although the case protrusion 122 is arranged in the recess 121 of the side wall 120, the recess 121 is not formed in the side wall 120, and the case protrusion 122 is arranged in the flat surface or convex part of the side wall 120. It's okay.

In the embodiment described above, the spacer 400b has the spacer wall portion 420, but the spacer 400b may not have some or all of the spacer wall portions. In this case, spacer 400b does not need to be a holder that holds power storage element 300.

In the above embodiment, the pair of spacers 400b have the above configuration, but one of the spacers 400b may not have the above configuration. The same applies to the spacer 400d.

In the embodiment described above, the spacers 400 (spacers 400a to 400d) are arranged alternately with the power storage element 300 in the Y-axis direction, but a configuration in which any of the spacers 400 is not arranged may also be used. The spacer 400a may not be arranged, and only the pair of spacers 400b may be arranged, and the spacer 400c may not be arranged, and only the pair of spacers 400d may be arranged. One of the pair of spacers 400b may not be arranged, and one of the pair of spacers 400d may not be arranged.

In the above embodiment, the case 10 includes the case body 100 and the lid 200, but the case 10 does not need to have the lid 200. In the embodiment described above, two power storage element rows each including a plurality of power storage elements 300 are lined up in the X-axis direction inside the case 10, but three or more power storage element rows may be lined up in the X-axis direction. Alternatively, only one power storage element row may be arranged. That is, in the X-axis direction, three or more spacers 400 may be lined up, or only one spacer 400 may be arranged.

Embodiments constructed by arbitrarily combining the constituent elements of the embodiments and their 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 electrical storage elements, such as a lithium ion secondary battery.

1 Power storage device 2 Power storage unit 10 Case 100 Case main body 101 Opening 120, 130 Side wall 121 Recessed part 122, 122A Case protrusion 123 First case inclined surface 123A First case step surface 123a Case first surface 123b Case second surface 124 Second Case inclined surface 124A Second case step surface 124a Case third surface 124b Case fourth surface 200 Lid 300 Energy storage element 310 Container 340 Terminal 400, 400a, 400b, 400c, 400d Spacer 410 Spacer body 420 Spacer wall 430, 430A Spacer Protruding portion 431, 431A First spacer protruding portion 431B First spacer inclined surface 431a Spacer first surface 432 First spacer convex portion 432a Spacer second surface 433, 433A Second spacer protruding portion 433B Second spacer inclined surface 433a Spacer third Surface 434 Second spacer convex portion 434a Spacer fourth surface 600, 601, 602, 603 Bus bar

Claims (5)

A power storage unit having a power storage element and a spacer;
a case that has a case body with an opening formed on one side in the first direction and houses the electricity storage unit;
The spacer has a spacer protrusion that protrudes toward the case in a second direction perpendicular to the first direction,
The case has a case protrusion that protrudes toward the spacer in the second direction and is disposed on one side of the spacer protrusion in a third direction orthogonal to the first direction and the second direction. ,
At least one of the spacer protrusion and the case protrusion has a first surface at a position facing the other, and a second surface disposed on one side of the first surface with respect to the first direction. death,
The second surface is arranged on one side in the third direction from the first surface. The power storage device according to claim 1, wherein the spacer is an end spacer arranged at an end of the power storage unit in the second direction. At least one of the spacer protrusion and the case protrusion has an inclined surface that is inclined toward one side of the third direction as it goes toward one side of the first direction, at a position facing the other;
The power storage device according to claim 1 , wherein the first surface and the second surface are part of the inclined surface. At least one of the spacer protrusion and the case protrusion has a protrusion that protrudes toward the other,
The power storage device according to claim 1 or 2, wherein the second surface is a tip surface of the convex portion. At least one of the spacer and the case has a third surface and a fourth surface opposite to the other on one side of the first surface and the second surface in the third direction,
The power storage device according to claim 1 or 2, wherein the fourth surface is arranged on one side in the first direction than the third surface and on the other side in the third direction than the third surface.

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