JP6891597B2 - Power storage device - Google Patents

Description

The present invention relates to a power storage device including a plurality of power storage elements.

Conventionally, there is a power storage device used for power storage or power supply, which is provided with a plurality of power storage elements. In such a power storage device, adjacent power storage elements are electrically connected by a metal member called a bus bar.

For example, Patent Document 1 discloses an assembled battery having a plurality of battery cells. In this assembled battery, the electrode terminals of different electrodes of adjacent battery cells are electrically connected to each other by a bus bar, and a cover portion that insulates the outer case of the battery cell and the bus bar is further arranged. Further, a voltage detection line extending to the battery monitoring unit is connected to each battery cell.

Japanese Unexamined Patent Publication No. 2012-113896

Like the conventional battery pack, a power storage device including a plurality of power storage elements includes a plurality of bus bars that connect the power storage elements, an insulating member that insulates the plurality of bus bars and each power storage element, and a monitoring unit. Various members such as electric wires that connect electric devices such as electric devices and each power storage element are incorporated. Further, for example, from the viewpoint of improving the energy density, it is preferable that the distance between the adjacent power storage elements is short. Therefore, a spacer having a function of insulating the power storage elements is arranged between the adjacent power storage elements. Is common.

As described above, the power storage device is composed of a large number of members, which causes difficulty in assembling. Further, when arranging conductive members such as a bus bar and an electric wire, there is a possibility that a short circuit may occur in the power storage element due to a work error.

An object of the present invention is to provide a power storage device including a plurality of power storage elements, which can be efficiently manufactured, in consideration of the above-mentioned conventional problems.

In order to achieve the above object, the power storage device according to one aspect of the present invention is a plurality of power storage elements arranged side by side in the first direction, each of which is arranged in a second direction intersecting the first direction. A plurality of power storage elements having the electrode terminals and a plurality of spacers, each of which is arranged between two adjacent power storage elements among the plurality of power storage elements, and the plurality of spacers. It includes a substrate arranged on the side of the power storage element in the second direction and integrated with the end portion of each of the plurality of spacers in the second direction.

According to this configuration, the plurality of spacers are in a state of being connected by a substrate. Therefore, for example, by arranging the substrates for a plurality of power storage elements, it is possible to collectively arrange the plurality of spacers for the plurality of power storage elements. Further, since the substrate is arranged on the electrode terminal side, it is possible to use the electrode terminal for positioning the substrate, for example. Therefore, the power storage device of this embodiment is a power storage device that can be efficiently manufactured.

Further, since each spacer is fixed to the substrate, for example, by fixing the position of the substrate in the power storage device, the movement of each of the plurality of power storage elements in the second direction is restricted by the base, and the movement of each of the plurality of power storage elements is restricted. Each spacer regulates movement in the direction parallel to the first direction. This is advantageous for improving the vibration resistance or impact resistance of the power storage device, for example.

Further, in the power storage device according to one aspect of the present invention, each of the plurality of spacers may extend from the substrate to the central portion of the plurality of power storage elements in the second direction.

For example, when each power storage element swells as the internal pressure rises, the central portion of each power storage element protrudes outward. Therefore, since each spacer extends to the central portion, the possibility that adjacent power storage elements come into direct contact with each other is reduced. That is, the safety of the power storage device that can be efficiently manufactured is further improved.

Further, in the power storage device according to one aspect of the present invention, even if each of the plurality of spacers extends from the substrate to a position beyond the center of the plurality of power storage elements in the second direction. Good.

According to this configuration, the lower end of each spacer (the end opposite to the substrate) is arranged at a position beyond the center in the second direction of the power storage element adjacent to the spacer. Therefore, when the power storage element is inflated, contact between the power storage element and other power storage elements adjacent to each other with the spacer in between is more reliably suppressed.

Further, the power storage device according to one aspect of the present invention further includes a conductive member electrically connected to at least one of the plurality of power storage elements, and the conductive member is fixed to the substrate. It may be.

According to this configuration, for example, when the bus bar, which is a conductive member, is fixed to the substrate, the arrangement of the plurality of spacers and the arrangement of the bus bar are collectively arranged by arranging the substrates for a plurality of power storage elements. Can be done. Further, when the bus bar and the electrode terminal are bonded by welding such as ultrasonic welding, the positioning of the bus bar during the bonding operation is facilitated. Further, for example, when the conductive member is a highly flexible electric wire, the electric wire is incorporated in the power storage device in a state of being fixed to the substrate. Problems such as pinching or wiring mistakes are unlikely to occur.

Further, in the power storage device according to one aspect of the present invention, the ends of each of the plurality of spacers on the opposite side of the substrate may be formed so that the width becomes narrower toward the tip. ..

As described above, the tapered shape of the tip of the spacer facilitates insertion of each spacer between the power storage elements. That is, the collective arrangement of the plurality of spacers with respect to the plurality of power storage elements is further facilitated.

Further, the power storage device according to one aspect of the present invention further includes an exterior body for accommodating the plurality of power storage elements, and a plurality of ribs are provided on the inner surface of the exterior body, and each of the plurality of ribs is provided. May be arranged at a position inserted between two adjacent power storage elements among the plurality of power storage elements.

According to this configuration, the position in the first direction inside the exterior body of each power storage element can be positioned at a regular position by a plurality of ribs. As a result, when the substrate is arranged on the plurality of power storage elements housed in the exterior body, the spacers can be easily inserted between the power storage elements. That is, the power storage device can be manufactured more efficiently.

Further, in the power storage device according to one aspect of the present invention, each of the plurality of ribs has a fitting portion that fits with a spacer arranged at a position facing the rib among the plurality of spacers. May be.

According to this configuration, since each of the plurality of spacers is fitted with the ribs provided on the exterior body, for example, the rigidity of the power storage device as a whole is improved. Further, since the deformation (distortion, bending, etc.) of each of the plurality of spacers is suppressed, the effect of suppressing the swelling of each power storage element by each of the plurality of spacers is improved.

Further, in the power storage device according to one aspect of the present invention, each of the plurality of spacers is arranged so as to cover the entire side surface of the power storage element adjacent to the spacer among the plurality of power storage elements. May be.

According to this configuration, for example, each spacer can further ensure electrical insulation between the containers of two adjacent storage elements.

Further, in the power storage device according to one aspect of the present invention, the plurality of power storage elements include two power storage elements connected in parallel and two power storage elements connected in series, and (i) the plurality of spacers. The length of the spacer arranged between the two storage elements connected in parallel in the second direction is (ii) the two storage elements connected in series among the plurality of spacers. The spacer arranged between the two may be shorter than the length in the second direction.

According to this configuration, for example, the electrical insulation between the containers of two power storage elements connected in series can be further ensured, and as a result, the safety of the power storage device is improved. Further, since the plurality of spacers include a relatively short spacer, the amount of material required for manufacturing the plurality of spacers can be reduced.

Further, the power storage device according to one aspect of the present invention includes an exterior body, a plurality of power storage elements arranged side by side along the bottom surface of the exterior body, and a plurality of spacers, each of which comprises the plurality of power storage devices. A plurality of spacers arranged between two adjacent two energy storage elements among the elements, and the plurality of spacers are arranged on the opposite side of the bottom surface of the plurality of energy storage elements and integrated with each of the plurality of spacers. It is provided with a substrate.

According to this configuration, for example, by arranging the substrates for the plurality of power storage elements housed in the exterior body, it is possible to collectively arrange the plurality of spacers. Further, since the substrate is arranged on the side opposite to the bottom surface, for example, the substrate can be arranged from the opening of the exterior body, which allows the plurality of power storage elements to be housed inside the exterior body. That is, since the substrate can be arranged through the relatively large opening of the exterior body, the arrangement of the substrate is easy. Therefore, the power storage device of this embodiment is a power storage device that can be efficiently manufactured.

Further, since each spacer is fixed to the substrate, for example, by fixing the substrate to the exterior body, each of the plurality of power storage elements is moved in the vertical direction (direction orthogonal to the bottom surface) by the substrate and the exterior body. The movement is regulated, and the movement of the plurality of power storage elements in the arrangement direction is regulated by each spacer. This is advantageous for improving, for example, vibration resistance or impact resistance.

It is a perspective view which shows the appearance of the power storage device which concerns on embodiment. It is an exploded perspective view which shows each component when the power storage device which concerns on embodiment is disassembled. It is a perspective view of the power storage element which concerns on embodiment. It is a side view which shows the structural relationship between a plurality of power storage elements and an inner lid unit which concerns on embodiment. It is a side view which shows the state which arranged the inner lid unit with respect to a plurality of power storage elements which concerns on embodiment. It is a figure for demonstrating the length of the spacer in the 2nd direction which concerns on embodiment. It is a figure which shows the 1st example of another shape of the spacer which concerns on embodiment. It is a figure which shows the 2nd example of another shape of the spacer which concerns on embodiment. It is a side view which shows the structural outline of the power storage device which concerns on the modification 1 of embodiment. It is a partial side view which shows the structural outline of the power storage device which concerns on the modification 2 of embodiment. It is a top view which shows the structural outline of the inner lid unit which concerns on the modification 3 of embodiment. It is a partial side view which shows the structural outline of the power storage device which concerns on the modification 3 of embodiment.

Hereinafter, a power storage device according to an embodiment of the present invention and a modified example thereof will be described with reference to the drawings. The following embodiments and modifications show comprehensive or specific examples, respectively. Numerical values, shapes, materials, components, arrangement positions and connection forms of the components, each process in the manufacturing method, the order of each process, etc. shown in the following embodiments and modifications are examples, and the present invention is limited. It is not the purpose of doing it. Further, among the components in the following embodiments and modifications, the components not described in the independent claims indicating the highest level concept are described as arbitrary components. Moreover, in each figure, the dimensions and the like are not exactly illustrated.

Further, in the following description and drawings, the arrangement direction of the plurality of power storage elements, the direction opposite to the long side surface of the container of the power storage element, or the thickness direction of the container is defined as the X-axis direction. Further, the arrangement direction of the electrode terminals in one power storage element or the opposite direction of the short side surface of the container of the power storage element is defined as the Y-axis direction. Further, the alignment direction between the outer body body and the lid of the power storage device, the line-up direction between the container body and the container lid of the power storage element, or the vertical direction is defined as the Z-axis direction. These X-axis directions, Y-axis directions, and Z-axis directions are directions that intersect each other (orthogonally in the present embodiment). Depending on the mode of use, the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described below as the vertical direction. Further, in the following description, for example, the plus side in the X-axis direction indicates the arrow direction side of the X-axis, and the minus side in the X-axis direction indicates the side opposite to the plus side in the X-axis direction. The same applies to the Y-axis direction and the Z-axis direction.

(Embodiment)
First, with reference to FIGS. 1 and 2, a general description of the power storage device 10 according to the present embodiment will be given. FIG. 1 is a perspective view showing the appearance of the power storage device 10 according to the embodiment. FIG. 2 is an exploded perspective view showing each component when the power storage device 10 according to the embodiment is disassembled.

The power storage device 10 is a device capable of charging electricity from the outside and discharging electricity to the outside. For example, the power storage device 10 is a battery module used for power storage and power supply applications. Specifically, the power storage device 10 includes, for example, automobiles such as electric vehicles (EV), hybrid electric vehicles (HEV) or plug-in hybrid electric vehicles (PHEV), motorcycles, watercraft, snowmobiles, agricultural machinery, and construction. It is used as a battery for driving a moving body such as a machine or for starting an engine.

As shown in FIGS. 1 and 2, the power storage device 10 includes an exterior body 11, a plurality of power storage elements 300 housed inside the exterior body 11, and a plurality of bus bars 400. The exterior body 11 has a lid body 100 and an exterior body body 200. In the present embodiment, the plurality of bus bars 400 are fixed to the substrate 510 arranged on the electrode terminal side (plus side in the Z-axis direction) of the plurality of power storage elements 300.

The exterior body 11 is a rectangular (box-shaped) container (module case) that houses a plurality of power storage elements 300 and the like. That is, the exterior body 11 is arranged outside the plurality of power storage elements 300, the bus bar 400, and the like, and these power storage elements 300 and the like are arranged at predetermined positions to protect them from impacts and the like. Further, the exterior body 11 is made of an insulating material such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polybutylene terephthalate (PBT), or ABS resin. As a result, the exterior body 11 prevents the power storage element 300 and the like from coming into contact with an external metal member or the like.

The lid 100 is a flat rectangular member that closes the opening 201 of the exterior body 200. The lid 100 is provided with a positive electrode external terminal 110 and a negative electrode external terminal 120. The power storage device 10 charges electricity from the outside and discharges electricity to the outside via the positive electrode external terminal 110 and the negative electrode external terminal 120. Further, the exterior body body 200 is a bottomed rectangular tubular housing having an opening 201 formed therein.

The power storage element 300 is a secondary battery (cell battery) capable of charging electricity and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. .. The power storage element 300 has a flat rectangular parallelepiped shape (square shape), and in the present embodiment, eight power storage elements 300 are arranged in the X-axis direction. The shape of the power storage element 300 and the number of power storage elements 300 arranged are not limited. Further, the power storage element 300 is not limited to the non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery, a capacitor, and further charged by the user. It may be a primary battery that can use the stored electricity without using the above. A detailed description of the configuration of the power storage element 300 will be described later with reference to FIG.

The bus bar 400 is a rectangular conductive member arranged on a plurality of power storage elements 300 and electrically connecting the electrode terminals of the plurality of power storage elements 300. In this embodiment, the bus bar 400 is made of, for example, an aluminum alloy. The positive electrode lead plate 420 and the negative electrode lead plate 430 are also formed of, for example, an aluminum alloy.

Further, in the present embodiment, each of the plurality of bus bars 400 is arranged so as to connect different poles of two adjacent power storage elements 300, whereby eight power storage elements 300 are connected in series. ing.

When the plurality of power storage elements 300 connected in this way are used as one power storage element unit 380, the positive electrode of the power storage element unit 380 (the positive electrode terminal of the power storage element 300 arranged on the positive side in the X-axis direction (positive electrode terminal 320 described later). )) Is electrically connected to the positive electrode external terminal 110 via the positive electrode lead plate 420. Further, the negative electrode of the power storage element unit 380 (the negative electrode terminal of the power storage element 300 arranged on the negative side in the X-axis direction (negative electrode terminal 330 described later)) is electrically connected to the negative electrode external terminal 120 via the negative electrode lead plate 430. Has been done. In the present embodiment, the positive electrode lead plate 420 and the negative electrode lead plate 430 are fixed to the substrate 510 in the same manner as the bus bar 400.

Here, in the present embodiment, the X-axis plus direction (or X-axis minus direction) direction is an example of the first direction, and the Z-axis plus direction is an example of the second direction. That is, in the present embodiment, the plurality of power storage elements 300 are arranged side by side in the first direction, and the electrode terminals are arranged in the second direction in each power storage element 300.

The base 510 is a flat member as a whole, which is made of an insulating material such as PC or PP like the exterior body 11. As described above, a plurality of bus bars 400, a positive electrode lead plate 420, and a negative electrode lead plate 430 are fixed to the substrate 510. In the present embodiment, the substrate 510 is further fixed with a CMU (Cell Monitoring Unit) 800 and an electric wire 700 for electrically connecting the CMU 800 and each of the plurality of bus bars 400. The bus bar 400, the positive electrode lead plate 420, the negative electrode lead plate 430, and the electric wire 700 are examples of conductive members. The CMU 800 is an example of an electric device that is electrically connected to a conductive member.

Each of the plurality of bus bars 400 is fixed to the substrate 510 in a state of being exposed on the back surface side (minus side in the Z-axis direction) of the substrate 510, and electrically and electrically with the two power storage elements 300 located directly below in FIG. It is mechanically connected. Further, each of the positive electrode lead plate 420 and the negative electrode lead plate 430 is fixed to the substrate 510 in a state of being exposed on the back surface side of the substrate 510, and is electrically and electrically with one power storage element 300 located directly below in FIG. It is mechanically connected.

The method of fixing the plurality of bus bars 400, the positive electrode lead plate 420, and the negative electrode lead plate 430 to the substrate 510 is not particularly limited. For example, the bus bar 400 may be fixed to the base 510 by fitting the bus bar 400 into the through hole provided in the base 510. Further, for example, a substrate 510 provided with a metal bus bar 400 or the like may be produced by insert molding.

The CMU 800 is a measuring device that measures the voltage of each power storage element 300, and is fixed to the upper surface (the surface on the plus side in the Z-axis direction) of the substrate 510 by, for example, a plurality of screws (not shown).

The electric wire 700 is a conductive member that electrically connects the CMU 800 and each of the plurality of bus bars 400. For example, the electric wire 700 is hooked on a plurality of claws (not shown) provided on the upper surface of the substrate 510 to be hooked on the substrate 510. It is fixed. One end of each of the plurality of electric wires 700 is connected to the bus bar 400, and the other end is connected to the CMU 800.

A terminal (not shown) is provided at one end of the electric wire 700, and when the bus bar 400 and the electrode terminal of the power storage element 300 are fastened by the nut, the terminal is located between the nut and the electrode terminal together with the bus bar 400. The terminals are sandwiched and fixed. Further, a connector is provided at the other end of the electric wire 700, and the electric wire 700 is mechanically and electrically connected to the CMU 800 by being fitted with the connector of the CMU 800. With such a configuration, the CMU 800 can measure the voltage of each power storage element 300.

A plurality of spacers 600 are provided on the back surface side of the substrate 510. Each of the plurality of spacers 600 is arranged between two adjacent power storage elements 300 among the plurality of power storage elements 300. In this embodiment, the plurality of spacers 600 are integrated with the substrate 510. Specifically, the substrate 510 and the plurality of spacers 600 are integrally molded.

As described above, in the present embodiment, the substrate 510, the conductive member (bus bar 400 or the like) fixed to the substrate 510, the electric device (CMU800), and the plurality of spacers 600 are used at the time of assembling the power storage device 10. It constitutes an inner lid unit 500 that can be handled as one member. The effects of the inner lid unit 500 and the like will be described later with reference to FIGS. 4 to 8.

Next, the configuration of the power storage element 300 will be described in detail. FIG. 3 is a perspective view of the power storage element 300 according to the embodiment. In FIG. 3, the inside of the power storage element 300 is shown through the container 310 of the power storage element 300.

As shown in FIG. 3, the power storage element 300 includes a container 310, a positive electrode terminal 320, and a negative electrode terminal 330. Further, an electrode body 340, a positive electrode current collector 350, and a negative electrode current collector 360 are arranged inside the container 310. An electrolytic solution (non-aqueous electrolyte) is also sealed inside the container 310, but the illustration is omitted. In addition to the above components, a gasket may be arranged between the positive electrode terminal 320, the negative electrode terminal 330, the positive electrode current collector 350, the negative electrode current collector 360, and the container 310, or the electrode body 340 and the container. A spacer may be arranged between the spacer and the 310.

The container 310 has a container body 311 and a container lid 312. Specifically, the container 310 has a bottom surface portion 315 on the negative side in the Z-axis direction in FIG. 3, a long side surface portion 314 on both side surfaces in the X-axis direction, a short side surface portion 313 on both side surfaces in the Y-axis direction, and a Z-axis. It is a square-shaped (square) container having a container lid portion 312 on the positive side in the direction. That is, in the container 310, the bottom surface portion 315, the two long side surface portions 314, and the two short side surface portions 313 form a container body 311 having a rectangular tubular shape and a bottom, and the opening of the container body 311 is the container lid portion 312. Is configured to be closed.

Specifically, the container 310 can be sealed inside by accommodating the electrode body 340 and the like inside the container body 311 and then joining the container body 311 and the container lid portion 312 by welding or the like. It has a structure. The material of the container 310 (container body 311 and container lid 312) is not particularly limited, but is preferably a weldable (bondable) metal such as stainless steel, aluminum, or aluminum alloy.

The electrode body 340 is a power storage element (power generation element) capable of storing electricity, includes a positive electrode plate, a negative electrode plate, and a separator, and is formed by laminating the positive electrode plate, the negative electrode plate, and the separator in the X-axis direction. There is. Specifically, the electrode body 340 is a winding type electrode formed by winding a positive electrode plate, a negative electrode plate, and a separator around a winding axis (a virtual axis in the Y-axis direction penetrating the center of the electrode body 340). It is a body and is electrically connected to the positive electrode current collector 350 and the negative electrode current collector 360.

The positive electrode plate is an electrode plate in which a positive electrode mixture layer is formed on the surface of a positive electrode base material layer which is a long strip-shaped metal foil made of aluminum, an aluminum alloy, or the like. The negative electrode plate is an electrode plate in which a negative electrode mixture layer is formed on the surface of a negative electrode base material layer which is a long strip-shaped metal foil made of copper, a copper alloy, or the like. The separator is a microporous sheet made of resin. As the positive electrode active material and the negative electrode active material used for the positive electrode mixture layer and the negative electrode mixture layer, known materials can be appropriately used as long as they are active materials capable of occluding and releasing lithium ions. As for the separator, a known material can be appropriately used as long as it does not impair the performance of the power storage element 300.

More specifically, in the electrode body 340, the positive electrode plate and the negative electrode plate are wound so as to be displaced from each other in the direction of the winding axis (Y-axis direction) via the separator. The positive electrode plate and the negative electrode plate each have a mixture layer non-forming portion which is a portion where the mixture layer is not formed and the base material layer is exposed at the end portions in the shifted directions. Specifically, the electrode body 340 has a positive electrode side end portion 341 in which a mixture layer non-forming portion of the positive electrode plate is laminated on one end in the winding axis direction (end portion on the positive side in the Y axis direction). There is. Similarly, the electrode body 340 has a negative electrode side end portion 342 in which a mixture layer non-forming portion of the negative electrode plate is laminated on the other end (the end portion on the negative side in the Y axis direction) in the winding axis direction. ing.

The positive electrode current collector 350 is arranged between the positive electrode plate of the electrode body 340 and the side wall of the container 310, and has conductivity and rigidity that are electrically connected to the positive electrode terminal 320 and the positive electrode plate of the electrode body 340. It is a member. Further, the negative electrode current collector 360 is arranged between the negative electrode plate of the electrode body 340 and the side wall of the container 310, and has conductivity and rigidity which are electrically connected to the negative electrode terminal 330 and the negative electrode plate of the electrode body 340. It is a member provided with. Specifically, the positive electrode current collector 350 is joined to the positive electrode side end 341 of the electrode body 340 by welding or the like, and the negative electrode current collector 360 is joined to the negative electrode side end 342 of the electrode body 340 by welding or the like. ing. The positive electrode current collector 350 is formed of aluminum or an aluminum alloy like the positive electrode base material layer of the positive electrode plate, and the negative electrode current collector 360 is made of copper or a copper alloy or the like like the negative electrode base material layer of the negative electrode plate. Is formed of.

The positive electrode terminal 320 is an electrode terminal electrically connected to the positive electrode plate of the electrode body 340 via the positive electrode current collector 350, and the negative electrode terminal 330 is the electrode body 340 via the negative electrode current collector 360. It is an electrode terminal electrically connected to the negative electrode plate. That is, the positive electrode terminal 320 and the negative electrode terminal 330 lead the electricity stored in the electrode body 340 to the external space of the power storage element 300, and the electricity is stored in the internal space of the power storage element 300 in order to store electricity in the electrode body 340. It is a metal electrode terminal for introducing.

Specifically, each of the positive electrode terminal 320 and the negative electrode terminal 330 has a shaft portion having a thread formed on the outer periphery thereof. That is, the positive electrode terminal 320 and the negative electrode terminal 330 are members called, for example, bolt terminals. Each of the positive electrode terminal 320 and the negative electrode terminal 330 mechanically and electrically with the bus bar 400, for example, by screwing a shaft portion inserted into a through hole 401 (see FIG. 2) provided in the bus bar 400 with a nut. Be connected. Further, the positive electrode terminal 320 can be mechanically and electrically connected to the positive electrode lead plate 420 as well, and the negative electrode terminal 330 can be mechanically and electrically connected to the negative electrode lead plate 430 as well. It is possible.

As the material of the positive electrode terminal 320 and the negative electrode terminal 330, aluminum, an aluminum alloy, or the like is adopted.

In the present embodiment, eight power storage elements 300, each having the above configuration, are arranged in a row, and the inner lid unit 500 including the substrate 510 is arranged from above, so that the bus bar 400 or the like for these power storage elements 300 can be obtained. The placement work can be performed all at once. Hereinafter, the structure of the substrate 510 and its surroundings and the like will be described in detail with reference to FIGS. 4 to 8.

FIG. 4 is a side view showing the structural relationship between the plurality of power storage elements 300 and the inner lid unit 500 according to the embodiment. FIG. 5 is a side view showing a state in which the inner lid unit 500 is arranged with respect to the plurality of power storage elements 300. In addition, in FIGS. 4 and 5, the exterior body body 200 is represented by a cross-sectional view so that a plurality of internal power storage elements 300 can be seen, and the lid 100 is not shown. This also applies to FIGS. 9, 10, and 11 described later.

When assembling the power storage device 10 according to the present embodiment, for example, as shown in FIG. 4, a plurality of power storage elements 300 are arranged on the bottom surface 210 of the exterior body body 200 of the exterior body 11, and above the plurality of power storage elements 300. The substrate 510 is arranged from. The plurality of power storage elements 300 and the substrate 510 are housed inside the exterior body body 200 through an opening 201 located at a position facing the bottom surface 210 in the exterior body body 200.

At this time, the shaft portions of the positive electrode terminal 320 and the negative electrode terminal 330 directly below the bus bar 400 are inserted into the two through holes 401 of each of the plurality of bus bars 400 fixed to the substrate 510. As a result, the arrangement (positioning) of the substrate 510 and the plurality of bus bars 400 with respect to the plurality of power storage elements 300 is completed. Further, a nut 480 is attached to a shaft portion protruding from each through hole 401 and tightened. As a result, the attachment of the plurality of bus bars 400 to the plurality of power storage elements 300 is completed, and the plurality of power storage elements 300 and the inner lid unit 500 are in the state shown in FIG. In this state, since the CMU 800 and the electric wire 700 that electrically connects each bus bar 400 and the CMU 800 are already fixed to the substrate 510, the electrical connection between the CMU 800 and each power storage element 300 is completed. There is.

Further, for example, the substrate 510 is fixed to the exterior body body 200 by welding the peripheral edge portion of the substrate 510 and the inner surface of the exterior body body 200. In this state, the substrate 510 is in contact with each of the plurality of power storage elements 300. As a result, the movement of the plurality of power storage elements 300 upward (in the direction toward the opening 201) is restricted. Therefore, the movement of the plurality of power storage elements 300 arranged on the bottom surface 210 in the arrangement direction (vertical direction in FIG. 5) of the bottom surface 210 and the opening 201 is restricted by the exterior body 11 and the base 510.

As described above, in the power storage device 10, the base 510 is not only used as a member for fixing the plurality of spacers 600 and the bus bar 400, but also moves the plurality of power storage elements 300 in the direction toward the opening 201 of the exterior body body 200. It also functions as a regulating member.

Further, when the substrate 510 is arranged with respect to the plurality of power storage elements 300 as shown in FIGS. 5 and 6, each of the plurality of spacers 600 integrated with the base 510 is located between two adjacent power storage elements 300. Is inserted into. This reduces the possibility that the containers 310 of the two power storage elements 300 adjacent to each other with the spacer 600 in between are in contact with each other. That is, the electrical insulation between the containers 310 of the two power storage elements 300 is ensured.

The substrate 510 may be arranged with respect to the plurality of power storage elements 300 before the plurality of power storage elements 300 are housed in the exterior body body 200. For example, the substrate 510 is arranged on a predetermined flat surface such as a work table from above a plurality of power storage elements 300 arranged at predetermined intervals. As a result, each of the plurality of spacers 600 is arranged between two adjacent power storage elements 300. In that state, end plates are arranged on both sides in the arrangement direction of the plurality of power storage elements 300, and the plurality of power storage elements 300 are fixed by connecting the two end plates with a connecting member. After that, a plurality of power storage elements 300 sandwiched between the two end plates and combined with the base 510 (inner lid unit 500) are housed in the exterior body body 200. It is also possible to manufacture the power storage device 10 by such a process.

As described above, the power storage device 10 according to the present embodiment is a plurality of power storage elements 300 arranged side by side in the first direction, each of which is arranged in the second direction intersecting the first direction. A plurality of power storage elements 300 having the electrode terminals (positive electrode terminal 320 and negative electrode terminal 330) are provided. The power storage device 10 is further composed of a plurality of spacers 600, each of which is a plurality of spacers 600 arranged between two adjacent power storage elements 300 among the plurality of power storage elements 300, and a plurality of power storage elements 300. It includes a substrate 510 that is arranged on the side in the second direction and is integrated with each of the plurality of spacers 600. In the present embodiment, the first direction is the X-axis plus direction (or the X-axis minus direction), and the second direction is the Z-axis plus direction.

As described above, in the present embodiment, the plurality of spacers 600 are connected by the substrate 510. Therefore, for example, by arranging the base 510 with respect to the plurality of power storage elements 300, it is possible to collectively arrange the plurality of spacers 600 with respect to the plurality of power storage elements 300. Further, since the substrate 510 is arranged on the side where the positive electrode terminal 320 and the negative electrode terminal 330 are provided with respect to the plurality of power storage elements 300, for example, the positive electrode terminal 320 or the negative electrode terminal 330 can be used for positioning the substrate 510. Is also possible. Therefore, the power storage device 10 according to the present embodiment is a power storage device 10 that can be efficiently manufactured.

Further, each spacer 600 is fixed to the substrate 510. Therefore, by fixing the position of the base 510 in the power storage device 10, each of the plurality of power storage elements 300 is restricted from moving in the second direction by the base 510, and is parallel to the first direction by each spacer 600. Movement in any direction is restricted. This is advantageous for improving the vibration resistance or impact resistance of the power storage device 10, for example.

Further, in the present embodiment, each of the plurality of spacers 600 extends from the substrate 510 to the central portion of the plurality of power storage elements 300 in the second direction. Specifically, the length of the spacer 600 according to the present embodiment in the second direction is described as shown in FIG.

FIG. 6 is a diagram for explaining the length of the spacer 600 according to the embodiment in the second direction. As shown in FIG. 6, when a predetermined range including the center (position of the alternate long and short dash line P) in the second direction (Z-axis plus direction) of the container 310 of the power storage element 300 is defined as the central portion 370, the spacer 600 Extends from the substrate 510 to the central portion 370. The length M of the central portion 370 in the second direction is, for example, half or less of the length L of the container 310 in the second direction.

Here, for example, when each power storage element 300 swells as the internal pressure rises, the central portion 370 of each power storage element 300 protrudes outward. Therefore, since each spacer 600 extends to the central portion 370, the possibility that the adjacent power storage elements 300 come into direct contact with each other is reduced. That is, the safety of the power storage device 10 that can be efficiently manufactured is further improved.

More specifically, in the present embodiment, each of the plurality of spacers 600 extends from the substrate 510 to a position beyond the center of the plurality of power storage elements 300 in the second direction.

That is, the lower end of each spacer 600 (the end opposite to the substrate 510) is arranged at a position beyond the center in the second direction of the power storage element 300 adjacent to the spacer 600. Therefore, when the power storage element 300 is inflated, direct contact between the power storage element 300 and other power storage elements 300 adjacent to each other with the spacer 600 in between is more reliably suppressed.

The size and shape of the spacer 600 is not limited to a specific size and shape. For example, each of the plurality of spacers 600 may be formed in the size shown in FIG. That is, each of the plurality of spacers 600 may be arranged so as to cover the entire side surface of the power storage element 300 adjacent to the spacer 600 among the plurality of power storage elements 300. Specifically, in the present embodiment, the spacer 600 is arranged along the long side surface portion 314 (see FIG. 3) of the power storage element 300, and the spacer 600 has a size that covers the entire area of the long side surface portion 314. It may be formed in a shape.

In this case, for example, each spacer 600 can further ensure electrical insulation between the containers 310 of two adjacent power storage elements 300.

Further, the power storage device 10 according to the present embodiment includes a conductive member electrically connected to at least one power storage element 300 among the plurality of power storage elements 300, and the conductive member is fixed to the substrate 510. .. Specifically, each of the plurality of bus bars 400, the positive electrode lead plate 420, the negative electrode lead plate 430, and the electric wire 700 is fixed to the substrate 510 as a conductive member.

According to this configuration, for example, by arranging the base 510 with respect to the plurality of power storage elements 300 arranged in the first direction, the plurality of spacers 600 are arranged and at least one (7 in the present embodiment). ) Can be arranged collectively. Further, if the electrode terminal of the power storage element 300 is not a bolt terminal but a flat electrode terminal joined to the bus bar 400 by laser welding or the like, the positioning of the bus bar 400 during the joining work is facilitated. Further, for example, since the highly flexible electric wire 700 is incorporated into the power storage device 10 in a state of being fixed to the base 510, between the members (for example, the base 510 and the exterior body body 200) at the time of manufacturing the power storage device 10. It is unlikely that problems such as pinching of the electric wire 700 between the wires or wiring mistakes will occur.

Further, in the present embodiment, the ends of each of the plurality of spacers 600 on the opposite side of the substrate 510 are formed so that the width becomes narrower as they approach the tip. Specifically, for example, as shown in FIG. 4, the end portion (spacer end portion 610) of the spacer 600 has a tapered shape. Therefore, each spacer 600 can be easily inserted between the power storage elements 300. That is, the collective arrangement of the plurality of spacers 600 with respect to the plurality of power storage elements 300 is further facilitated.

When the spacer 600 is viewed from the thickness direction (X-axis direction) of the spacer 600, the spacer 600 may be formed so that the width becomes narrower as the end portion of the spacer 600 approaches the tip end. For example, as shown in FIG. 8, each spacer 600 also has a spacer end portion 611 formed so that the width becomes narrower as it approaches the tip, so that the respective spacer 600 can be inserted between the power storage elements 300. It will be easy. That is, for example, when the tip of the spacer 600 is inserted into the gap between two adjacent power storage elements 300, the width of the tip of the spacer 600 in the longitudinal direction (Y-axis direction) of the gap is relatively short, so that the tip and the two The possibility of interference with the power storage element 300 is reduced. Therefore, even when each of the spacers 600 is formed in the shape shown in FIG. 8, the collective arrangement of the plurality of spacers 600 with respect to the plurality of power storage elements 300 is further facilitated.

Although the power storage device 10 and its supplement according to the embodiment have been described above, the spacer 600 and the like included in the power storage device 10 may have a configuration different from the above description. Therefore, a modified example of the spacer 600 or the like included in the power storage device 10 will be described below, focusing on the difference from the above embodiment.

(Modification example 1)
FIG. 9 is a side view showing a configuration outline of the power storage device 10a according to the first modification of the embodiment. The power storage device 10a shown in FIG. 9 includes an exterior body 11a that accommodates a plurality of power storage elements 300. A plurality of ribs 250 are provided on the inner surface of the exterior body 11a, and each of the plurality of ribs 250 is arranged at a position inserted between two adjacent power storage elements 300 among the plurality of power storage elements 300. Has been done. In this modification, a plurality of ribs 250 are provided on the bottom surface 210 of the exterior body body 200 included in the exterior body 11a.

According to this configuration, the position in the first direction inside the exterior body 11a of each power storage element 300 can be positioned at a regular position by the plurality of ribs 250. As a result, when arranging the base 510 with respect to the plurality of power storage elements 300 housed in the exterior body 11a, the spacers 600 integrated with the base 510 can be easily inserted between the power storage elements 300. it can. That is, the power storage device 10a can be manufactured more efficiently.

The arrangement position of the plurality of ribs 250 is not limited to the bottom surface 210 of the exterior body body 200. For example, all or a part of the plurality of ribs 250 may be arranged on the inner surface of the exterior body body 200 in the Y-axis direction. Even in this case, the positioning function for each power storage element 300 by the plurality of ribs 250 is exhibited.

(Modification 2)
FIG. 10 is a partial side view showing a configuration outline of the power storage device 10b according to the second modification of the embodiment. The power storage device 10b shown in FIG. 10 has a plurality of ribs 255 provided on the inner surface of the exterior body 11b, similarly to the power storage device 10a according to the first modification. In this modification, each of the plurality of ribs 255 has a fitting portion 255a that fits with the spacer 600 arranged at a position facing the rib 255 among the plurality of spacers 600.

Specifically, the rib 255 according to the present modification is formed with a recess into which the spacer end portion 610 is inserted, and this recess functions as a fitting portion 255a.

According to this configuration, since each of the plurality of spacers 600 is fitted with the rib 255 provided on the exterior body 11b, for example, the rigidity of the power storage device 10b as a whole is improved. Further, since the deformation (distortion, bending, etc.) of each of the plurality of spacers 600 is suppressed, the effect of suppressing the swelling of each power storage element 300 by each of the plurality of spacers 600 is improved.

The fitting portion 255a may be fitted with the spacer 600 in a manner different from that shown in FIG. For example, the rib 255 may be fitted with the spacer 600 by inserting the tip portion of the rib 255 into a recess provided at the end of the spacer 600. That is, the tip portion of the rib 255 inserted into the recess of the spacer 600 may function as the fitting portion 255a.

Further, for example, when the rib 255 is arranged on the inner surface of the exterior body body 200 in the Y-axis direction, the fitting portion 255a is an end portion of the spacer 600 in the Y-axis direction and faces the rib 255. It may be fitted to the end. Even in this case, the rigidity of the power storage device 10b as a whole can be improved, or the effect of suppressing the swelling of each power storage element 300 can be improved.

(Modification example 3)
FIG. 11 is a plan view showing an outline of the configuration of the inner lid unit 500a according to the third modification of the embodiment. FIG. 12 is a partial side view showing a configuration outline of the power storage device 10c according to the third modification of the embodiment.

Note that FIG. 11 shows the inner lid unit 500a in a state of being arranged with respect to the plurality of power storage elements 300. Further, in FIG. 11, in order to clearly show the position of the spacer 600, only the outer shape of the substrate 510 is represented by a dotted line, the arrangement region of the spacer 600 is represented by a diagonal line, and the CMU800 and the CMU800 The illustration of the electric wire 700 is omitted. Further, in FIGS. 11 and 12, in order to distinguish two spacers 600 having different lengths in the second direction (direction in the Z-axis plus direction), one of these two spacers 600 is designated by a reference numeral “600a”. On the other hand, "600b" is attached. Further, the positive electrode terminal 320 is represented by a circle without a pattern, and the negative electrode terminal 330 is represented by a circle with dots.

The power storage device 10c according to this modification includes an inner lid unit 500a. In the inner lid unit 500a, the plurality of bus bars 400 are fixed to the base 510, and this point is common to the inner lid unit 500 according to the above embodiment. However, in this modification, the electrical connection mode of the plurality of power storage elements 300 by the plurality of bus bars 400 is different from that of the above embodiment.

Specifically, in this modification, in the plurality of bus bars 400, two power storage elements 300 are connected in parallel to form four sets of power storage element groups, and the four sets of power storage element groups are connected in series. ing. When the plurality of power storage elements 300 connected in this way are regarded as one power storage element unit 380a, the positive electrode of the power storage element unit 380a (the positive electrode terminal 320 of the two power storage elements 300 arranged on the positive side in the X-axis direction). ) Is electrically connected to the positive electrode external terminal 110 (see FIG. 2) via a bus bar or the like (not shown). Further, the negative electrode of the power storage element unit 380a (the negative electrode terminals 330 of the two power storage elements 300 arranged on the negative side in the X-axis direction) is electrically connected to the negative electrode external terminal 120 (see FIG. 2) via a bus bar or the like (not shown). Connected to.

As described above, in this modification, the plurality of power storage elements 300 include two power storage elements 300 connected in parallel and two power storage elements 300 connected in series. Further, in the present modification, (i) of the plurality of spacers 600, the lengths of the spacers 600 arranged between the two power storage elements 300 connected in parallel are (ii) a plurality of lengths in the second direction. Of the spacers 600, the length of the spacer 600 arranged between the two power storage elements 300 connected in series is shorter than the length in the second direction.

Specifically, for example, in FIGS. 11 and 12, the power storage element 300 with "A" (hereinafter, referred to as power storage element A; the same applies to the power storage element 300 with "B" and "C"). The power storage element B is connected in parallel. Further, the power storage element B and the power storage element C are connected in series. In this configuration, the length of the spacer 600a arranged between the power storage element A and the power storage element B in the second direction (the length in the vertical direction in FIG. 12) is arranged between the power storage element B and the power storage element C. It is shorter than the length of the spacer 600b in the second direction.

According to this configuration, for example, a relatively long spacer 600b can further ensure electrical insulation between the containers 310 of the two storage elements 300 connected in series. As a result, the safety of the power storage device 10c can be improved. Further, by including the relatively short spacer 600b in the plurality of spacers 600, the amount of material required for manufacturing the plurality of spacers 600 can be reduced.

(Other embodiments)
The power storage device according to the present invention has been described above based on the embodiments and modifications thereof. However, the present invention is not limited to the above-described embodiment and its modifications. As long as the gist of the present invention is not deviated, various modifications that can be conceived by those skilled in the art are applied to the above-described embodiment or examples thereof, or a form constructed by combining a plurality of the above-described components. Included within the scope of the invention.

For example, when the container lid portion 312 of each power storage element 300 is provided with a gas discharge valve, the substrate 510 may be provided with a through hole for allowing gas to pass through. In this case, for example, a flow path for discharging the gas discharged from each power storage element 300 to the outside of the exterior body 11 may be formed in the lid body 100. As a result, for example, when gas is discharged from the gas discharge valve of one or more power storage elements 300, the gas can be quickly released to the exterior body 11, and as a result, an increase in the internal pressure of the exterior body 11 is suppressed. To.

Further, for example, the substrate 510, the positive electrode terminal 320, and the negative electrode terminal 330 may not be arranged on the same side with respect to the plurality of power storage elements 300. For example, in FIG. 2, when the positive electrode terminal 320 and the negative electrode terminal 330 of each power storage element 300 are oriented toward the plus side (or minus side) in the Y-axis direction, and a plurality of power storage elements 300 are housed in the exterior body body 200. Is assumed. In this case, the substrate 510 may be arranged on the positive side in the Z-axis direction of the plurality of power storage elements 300. In this case, the bus bar 400 is not arranged on the substrate 510. However, if the substrate 510 is provided with at least a plurality of spacers 600, the spacers 600 can be collectively arranged between the two power storage elements 300 adjacent to each other.

That is, regardless of whether or not the positions of the substrate 510 and the electrode terminals (positive electrode terminal 320 and negative electrode terminal 330) are the same with respect to the plurality of power storage elements 300, for example, the power storage device 10 according to the above embodiment may be used. It is expressed as follows.

The power storage device 10 is an exterior body 11, a plurality of power storage elements 300 arranged side by side along the bottom surface 210 of the exterior body 11, and a plurality of spacers 600, each of which is a plurality of power storage elements 300. A plurality of spacers 600 arranged between two adjacent power storage elements 300 and a substrate arranged on the opposite side of the bottom surface 210 with the plurality of power storage elements 300 interposed therebetween and integrated with each of the plurality of spacers 600. It is equipped with 510.

According to this configuration, for example, by arranging the base 510 with respect to the plurality of power storage elements 300 housed in the exterior body 11, the plurality of spacers 600 can be collectively arranged. Further, since the base 510 is arranged on the side opposite to the bottom surface 210, for example, the base 510 is arranged from the opening 201 of the exterior body 11 which allows the plurality of power storage elements 300 to be housed inside the exterior body 11. be able to. That is, since the base 510 can be arranged through the relatively large opening 201 of the exterior body 11, the arrangement of the base 510 is easy. Therefore, the power storage device 10 is a power storage device 10 that can be efficiently manufactured.

Further, each spacer 600 is fixed to the substrate 510. Therefore, for example, by fixing the base 510 to the exterior body 11, the movement of each of the plurality of power storage elements 300 in the vertical direction (direction orthogonal to the bottom surface 210) is restricted by the base 510 and the exterior body 11. In addition, each spacer 600 regulates the movement of the plurality of power storage elements 300 in the arrangement direction. This is advantageous for improving the vibration resistance or impact resistance of the power storage device 10, for example.

Further, when the container lid portion 312 of each power storage element 300 is provided with a gas discharge valve, the base 510 is located at a position not facing each gas discharge valve, so that the base 510 is considered for the gas flow path. Can be designed without.

Further, in the above embodiment, the CMU 800 is fixed to the base 510, but an electric device of a type different from that of the CMU 800 may be fixed to the base 510. For example, a BMU (Battery Management Unit) may be fixed to the substrate 510.

Further, it is not essential that the electric device is fixed to the substrate 510. For example, the CMU 800 may be provided in the power storage device 10 in a state of being fixed to a member different from the substrate 510. That is, the inner lid unit 500 may include at least a substrate 510 and a plurality of spacers 600 integrated with the substrate 510, and does not include a conductive member such as a bus bar 400 and an electric device such as a CMU 800. May be good.

Further, the substrate 510 including the plurality of spacers 600 integrally may not be manufactured by integral molding. For example, it is also possible to obtain a substrate 510 integrated with each of the plurality of spacers 600 by welding a plurality of spacers 600 to the flat plate-shaped substrate 510 by heat or by adhering them with an adhesive. .. Further, for example, by press-fitting the end portion of the spacer 600 into each of the plurality of grooves provided in the substrate 510, it is possible to obtain the substrate 510 integrated with each of the plurality of spacers 600.

Further, the electrode body 340 included in the power storage element 300 is formed by winding a positive electrode plate, a negative electrode plate, and a separator in the vertical direction (winding on a winding shaft parallel to the Y-axis direction in FIG. 3). It is assumed that it has a winding shape. However, the electrode body 340 has a horizontally wound winding shape formed by winding a positive electrode plate, a negative electrode plate, and a separator in the lateral direction (winding on a winding axis parallel to the Z-axis direction). It may have a laminated shape in which flat plate-shaped electrode plates are laminated.

The above-mentioned various supplementary matters concerning the power storage device 10 are also applied to each of the power storage devices 10a to 10c according to the above-described modifications 1 to 3.

Further, the present invention can be realized not only as any of such power storage devices 10, 10a to 10c, but also as an inner lid unit provided in any of the power storage devices 10, 10a to 10c. ..

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

10, 10a, 10b, 10c Power storage device 11, 11a, 11b Exterior 210 Bottom surface 250, 255 Rib 255a Fitting part 300 Power storage element 320 Positive electrode terminal 330 Negative electrode terminal 370 Central part 400 Bus bar 510 Base 600, 600a, 600b Spacer 610, 611 Spacer end 700 Wire

Claims (9)

A plurality of power storage elements arranged side by side in the first direction, each of which has an electrode terminal arranged in a second direction intersecting the first direction, and a plurality of power storage elements.
A plurality of spacers, each of which is a plurality of spacers arranged between two adjacent power storage elements among the plurality of power storage elements.
A substrate arranged on the second direction side of the plurality of power storage elements and integrated with each of the plurality of spacers is provided.
The ends of each of the plurality of spacers on the opposite side of the substrate are formed so that the width becomes narrower toward the tip.
Power storage device. A plurality of power storage elements arranged side by side in the first direction, each of which has an electrode terminal arranged in a second direction intersecting the first direction, and a plurality of power storage elements.
A plurality of spacers, each of which is a plurality of spacers arranged between two adjacent power storage elements among the plurality of power storage elements.
A substrate arranged on the second direction side of the plurality of power storage elements and integrated with each of the plurality of spacers is provided.
The plurality of power storage elements include two power storage elements connected in parallel and two power storage elements connected in series.
(I) The length of the spacer arranged between the two power storage elements connected in parallel among the plurality of spacers in the second direction is (ii) the length of the plurality of spacers. The length of the spacer arranged between the two power storage elements connected in series is shorter than the length in the second direction.
Power storage device. The power storage device according to claim 1 or 2 , wherein each of the plurality of spacers extends from the substrate to the central portion of the plurality of power storage elements in the second direction. The power storage device according to any one of claims 1 to 3, wherein each of the plurality of spacers extends from the substrate to a position of the plurality of power storage elements beyond the center in the second direction. Further, a conductive member electrically connected to at least one of the plurality of power storage elements is provided.
The power storage device according to any one of claims 1 to 4 , wherein the conductive member is fixed to the substrate. Further, an exterior body for accommodating the plurality of power storage elements is provided.
A plurality of ribs are provided on the inner surface of the exterior body.
The power storage device according to any one of claims 1 to 5, wherein each of the plurality of ribs is arranged at a position inserted between two adjacent power storage elements among the plurality of power storage elements. The power storage device according to claim 6, wherein each of the plurality of ribs has a fitting portion that fits with a spacer arranged at a position facing the rib among the plurality of spacers. The power storage according to any one of claims 1 to 7, wherein each of the plurality of spacers is arranged so as to cover the entire side surface of the power storage element adjacent to the spacer among the plurality of power storage elements. apparatus. With the exterior
A plurality of power storage elements arranged side by side along the bottom surface of the exterior body, and
A plurality of spacers, each of which is a plurality of spacers arranged between two adjacent power storage elements among the plurality of power storage elements.
A substrate that is arranged on the side opposite to the bottom surface of the plurality of power storage elements and is integrated with each of the plurality of spacers is provided.
The end of each of the plurality of spacers on the opposite side of the substrate is formed so that the width becomes narrower as it approaches the tip.
Power storage device.

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