JP7524551B2 - Power storage device - Google Patents

Description

The present invention relates to an energy storage device that includes an energy storage unit having an energy storage element and an electrical device that is attached to the energy storage unit.

Conventionally, there is known a storage device that includes a storage unit having a storage element and an electrical device, and the electrical device is attached to the storage unit via a mounting member. For example, Patent Document 1 discloses a storage device (battery pack) in which an electrical device (circuit unit) is attached to a storage unit having a storage element (battery cell) via a mounting member (terminal block).

JP 2018-133152 A

In an energy storage device, it is important to save space (reducing size) because the space available for installation is limited. However, in a configuration in which an electrical device is attached to a storage unit via a mounting member, as in the above-mentioned conventional energy storage device, the thickness of both the electrical device and the mounting member is added to the storage unit, and the dimensions of the energy storage device may become large.

The present invention was made by the inventors with a new focus on the above problem, and aims to provide an electricity storage device that can suppress an increase in size.

In order to achieve the above object, the energy storage device according to one aspect of the present invention is an energy storage device including an energy storage unit having an energy storage element and an electrical device attached to the energy storage unit, and includes a mounting member disposed between the energy storage unit and the electrical device, attached to the energy storage unit, and to which the electrical device is attached, the mounting member having an opening through which the electrical device is inserted and which exposes the surface of the electrical device facing the energy storage unit to the energy storage unit side.

According to this, the energy storage device includes an electrical equipment mounting member disposed between the energy storage unit and the electrical equipment, and the mounting member has an opening through which the electrical equipment is inserted and the surface of the electrical equipment facing the energy storage unit is exposed to the energy storage unit. In this way, an opening is formed in the mounting member, and the electrical equipment is inserted into the opening. This makes it possible to prevent the dimensions of the energy storage device from increasing due to the thickness of both the electrical equipment and the mounting member being added to the energy storage unit, even when the electrical equipment is mounted to the energy storage unit via the mounting member. Therefore, it is possible to prevent an increase in the dimensions of the energy storage device caused by mounting the electrical equipment to the energy storage unit.

The electrical device may have a main body and a first protrusion protruding from the main body toward the power storage unit, and the opening may be configured so that the first protrusion is inserted into the opening, exposing a surface of the first protrusion facing the power storage unit to the power storage unit side.

According to this, the electrical device has a main body and a first convex portion that protrudes toward the power storage unit, and the first convex portion is inserted into the opening of the mounting member. In this way, if the electrical device has a first convex portion that protrudes toward the power storage unit, there is a concern that the dimensions will increase when the electrical device is mounted on the power storage unit, so the first convex portion is inserted into the opening of the mounting member. This makes it possible to suppress an increase in the dimensions of the power storage device caused by mounting the electrical device to the power storage unit.

The electrical device may also have an insulating cover member, and the opening may be configured so that the cover member is inserted into the opening, exposing the surface of the cover member facing the power storage unit to the power storage unit side.

According to this, an insulating cover member for the electrical device is inserted into the opening of the mounting member. When the electrical device is inserted into the opening of the mounting member in this way, the distance between the power storage unit and the electrical device becomes shorter, so an insulating cover member is provided for the electrical device and the cover member is inserted into the opening of the mounting member. This ensures insulation between the power storage unit and the electrical components, etc., inside the cover member for the electrical device, even when the electrical device is inserted into the opening of the mounting member and the distance between the power storage unit and the electrical device becomes shorter.

The energy storage element may have an electrode terminal, and the mounting member may be arranged to face a surface of the energy storage unit that is different from the surface on which the electrode terminal is arranged.

Because bus bars are attached to the electrode terminals of the energy storage element, if an electrical device is placed opposite the surface of the energy storage unit on which the electrode terminals are located, there is a risk of a large increase in the dimensions of the electrode terminals or the occurrence of a short circuit. For this reason, the mounting member is placed opposite a surface of the energy storage unit other than the surface on which the electrode terminals are located. This makes it possible to attach the electrical device to the energy storage unit while suppressing problems such as an increase in the dimensions of the energy storage device.

The mounting member may also have a second protrusion around the opening that protrudes toward the electrical device.

With this, since the mounting member has a second protrusion around the opening that protrudes toward the electrical device, the second protrusion can be used as a guide when inserting the electrical device into the opening and as a positioning portion. This makes it easy to insert the electrical device into the opening of the mounting member, making it easy to realize a configuration that suppresses an increase in the dimensions of the electricity storage device.

The present invention can be realized not only as an electricity storage device, but also as a mounting member for an electrical device, or a combination of the mounting member and the electrical device.

The electricity storage device of the present invention can suppress the increase in dimensions.

1 is a perspective view showing an external appearance of a power storage device according to an embodiment; 2 is a perspective view showing the inside of an exterior body with a main body and a lid separated in an energy storage device according to an embodiment; FIG. 2 is an exploded perspective view showing inner components of an exterior body of the energy storage device according to the embodiment; FIG. FIG. 2 is an exploded perspective view illustrating the components of the electricity storage unit according to the embodiment. FIG. 2 is an exploded perspective view showing each component of the energy storage element according to the embodiment. 1 is a perspective view showing configurations of an electrical device, an end plate, and a mounting member according to an embodiment; 2 is a cross-sectional view showing the configuration of an electrical device, an end plate, and a mounting member according to the embodiment. FIG.

The following describes an energy storage device according to an embodiment of the present invention (including its variations) with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection forms, manufacturing processes, and the order of manufacturing processes shown in the following embodiments are merely examples and are not intended to limit the present invention. Furthermore, the dimensions and other details are not strictly shown in each figure. Furthermore, the same reference numerals are used in each figure to identify identical or similar components.

In the following description and drawings, the longitudinal direction of the exterior body of the energy storage device, the arrangement direction of the energy storage unit and the electrical equipment, the arrangement direction of the energy storage unit and the mounting member, the arrangement direction of the pair of side plates, the extension direction of the pair of end plates, the opposing direction of the short sides of the container of the energy storage element, or the arrangement direction of the pair of electrode terminals in one energy storage element is defined as the X-axis direction. The arrangement direction of the energy storage element and the bus bar or bus bar frame, or the arrangement direction of the main body and the lid of the container of the energy storage element is defined as the Y-axis direction. The arrangement direction of the main body and the lid of the exterior body of the energy storage device, the arrangement direction of the pair of end plates, the arrangement direction of the energy storage element and the end plate, the opposing direction of the long sides of the container of the energy storage element, the flattening direction of the energy storage element, the stacking direction of the electrode plates of the electrode body of the energy storage element, or the up-down direction is defined as the Z-axis direction. These X-axis, Y-axis, and Z-axis directions intersect each other (orthogonal in this embodiment). Depending on the usage, the Z-axis direction may not be the up-down direction, but for ease of explanation, the following explanation will assume that the Z-axis direction is the up-down direction.

In the following description, for example, the positive X-axis direction refers to the direction of the X-axis arrow, and the negative X-axis direction refers to the opposite direction to the positive X-axis direction. The same applies to the Y-axis and Z-axis directions. In the following, the X-axis direction may also be referred to as the arrangement direction. Furthermore, expressions indicating relative directions or attitudes, such as parallel and perpendicular, may also include cases where the directions or attitudes are not strictly speaking the same. For example, saying that two directions are perpendicular does not only mean that the two directions are completely perpendicular, but also means that the directions are substantially perpendicular, that is, there is a difference of, for example, a few percent.

(Embodiment)
[1 General Description of Power Storage Device 10]
First, a schematic configuration of the energy storage device 10 according to the present embodiment will be described. Fig. 1 is a perspective view showing the external appearance of the energy storage device 10 according to the present embodiment. Fig. 2 is a perspective view showing the inside of the exterior body 100 in the energy storage device 10 according to the present embodiment, with the main body and the lid of the exterior body 100 separated. Fig. 3 is an exploded perspective view showing the components inside the exterior body 100 of the energy storage device 10 according to the present embodiment.

The power storage device 10 is a device that can charge electricity from the outside and discharge electricity to the outside, and in this embodiment, has a substantially rectangular parallelepiped shape. For example, the power storage device 10 is a battery module (battery pack) used for power storage or power source applications. Specifically, the power storage device 10 is used as a battery for driving or starting the engine of a moving body such as an automobile, motorcycle, watercraft, ship, snowmobile, agricultural machinery, construction machinery, or railroad vehicle for electric railway. Examples of the above-mentioned automobiles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and gasoline-powered automobiles. Examples of the above-mentioned railroad vehicles for electric railways include trains, monorails, and linear motor cars. The power storage device 10 can also be used as a stationary battery for home use or for power generation.

As shown in Figures 1 to 3, the energy storage device 10 includes an exterior body 100, an energy storage unit 200 housed in the exterior body 100, an attachment member 300, an electrical device 400, and a busbar unit 500. In addition to the above components, the energy storage device 10 may also include an exhaust section for exhausting gas discharged from the energy storage unit 200 to the outside of the exterior body 100, and a connector connected to the electrical device 400 by an electric wire or the like for transmitting signals to the outside.

The exterior body 100 is a box-shaped (approximately rectangular parallelepiped) container (module case) that constitutes the exterior body of the energy storage device 10. In other words, the exterior body 100 is arranged outside the energy storage unit 200 and the electrical equipment 400, etc., and fixes the energy storage unit 200 and the electrical equipment 400, etc. at a predetermined position to protect them from impacts, etc. The exterior body 100 is formed of, for example, an insulating material such as 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), ABS resin, or a composite material thereof, or a metal with an insulating coating. The exterior body 100 prevents the power storage unit 200, the electrical device 400, etc. from coming into contact with external metal members, etc. Note that the exterior body 100 may be formed of a conductive member such as a metal as long as the electrical insulation of the power storage unit 200, the electrical device 400, etc. is maintained.

The exterior body 100 has an exterior body main body 110 constituting the main body of the exterior body 100, and an exterior body lid body 120 constituting the lid body of the exterior body 100. The exterior body main body 110 is a bottomed rectangular cylindrical housing (chassis) with an opening formed therein, and contains the storage element 210 and the electrical device 400, etc. The exterior body lid body 120 is a flat rectangular member that closes the opening of the exterior body main body 110. The exterior body lid body 120 is preferably airtight or watertightly joined to the exterior body main body 110 by adhesive, heat sealing, ultrasonic welding, etc. In addition, the exterior body lid body 120 is provided with external terminals 130, which are a pair of module terminals (general terminals) on the positive and negative sides. The energy storage device 10 charges with electricity from the outside and discharges electricity to the outside through this pair of external terminals 130. The external terminal 130 is formed from a conductive metal material such as aluminum, an aluminum alloy, copper, or a copper alloy.

In the energy storage unit 200, a plurality of energy storage elements 210 are stacked in the Z-axis direction in a horizontally placed (laying on their side) state and arranged in the X-axis direction, so that the energy storage unit 200 has a shape that is flat in the Z-axis direction and elongated in the X-axis direction. Specifically, the energy storage unit 200 has a configuration in which a plurality of energy storage elements 210 arranged in the Z-axis direction and the X-axis direction are sandwiched in the Z-axis direction and the X-axis direction by a pair of end plates 230 and a pair of side plates 240 together with spacers 220, 223. A more detailed explanation of the configuration of the energy storage unit 200 will be given later.

The electrical device 400 is a device capable of monitoring the state of the energy storage element 210 of the energy storage unit 200 and controlling the energy storage element 210, and is attached to the energy storage unit 200. In this embodiment, the electrical device 400 is a flat rectangular member arranged at the longitudinal end of the energy storage unit 200, that is, in the positive direction of the X-axis of the energy storage unit 200. The electrical device 400 has electrical components (electrical components) such as a circuit board, a shunt resistor, and a connector that monitors the charging and discharging states of the energy storage element 210 and controls the charging and discharging of the energy storage element 210. The electrical device 400 has a configuration in which these electrical components are housed in an insulating cover member 400a. A detailed description of the configuration of the electrical device 400 will be described later.

The mounting member 300 is a member that mounts the electrical device 400 to the power storage unit 200. In other words, the mounting member 300 is a flat plate-shaped member that is disposed between the power storage unit 200 and the electrical device 400, is attached to the power storage unit 200, and has the electrical device 400 attached thereto. The mounting member 300 is formed, for example, from any electrically insulating resin material that can be used for the exterior body 100 described above.

The mounting member 300 is disposed opposite a surface of the energy storage unit 200 that is different from the surface on which the electrode terminals of the energy storage element 210 are disposed. Specifically, the mounting member 300 is disposed in the X-axis direction (arrangement direction) of the energy storage unit 200. In this embodiment, the mounting member 300 is attached to the side surface of the energy storage unit 200 in the positive direction of the X-axis, so that the electrical device 400 is attached to the side surface of the energy storage unit 200 in the positive direction of the X-axis in an upright position (a position parallel to the YZ plane). The mounting member 300 is also attached to at least one plate member of the pair of end plates 230 of the energy storage unit 200 and the side plates 240 connecting the pair of end plates 230.

In other words, the plate member refers to at least one of the pair of end plates 230 (end plates 231 and 232 described below) and the side plate 240 in the positive direction of the X-axis (side plate 242 described below), and the mounting member 300 is attached to the plate member. In this embodiment, the mounting member 300 is attached to both of the pair of end plates 230 and the side plate 240 in the positive direction of the X-axis, so the plate member refers to the pair of end plates 230 and the side plate 240. A detailed description of the configuration of the mounting member 300 will be given later.

The busbar unit 500 is a member that electrically connects the energy storage unit 200 and the electrical device 400, electrically connects the electrical device 400 and the external terminal 130, and electrically connects the energy storage unit 200 and the external terminal 130. The busbar unit 500 has a busbar 510 and a relay 520.

The bus bar 510 is a plate-shaped member that connects the bus bar 250 (described later) of the energy storage unit 200 to the electric device 400, connects the electric device 400 to the external terminal 130, connects the bus bar 250 to the relay 520, and connects the relay 520 to the external terminal 130. In this embodiment, the bus bar 510 is connected (joined) to the bus bar 250, the electric device 400, the external terminal 130, or the relay 520 by bolt fastening, but may be connected (joined) by welding, crimping, or the like. The bus bar 510 is formed of, for example, a conductive member made of a metal such as aluminum, an aluminum alloy, copper, a copper alloy, or nickel, or a combination thereof, or a conductive member other than a metal. The relay 520 is a relay (electric relay) that is arranged between the energy storage unit 200 and the external terminal 130 via the bus bar 510.

[2. Description of the Configuration of the Energy Storage Unit 200]
Next, the configuration of the energy storage unit 200 will be described in detail with reference to Fig. 4 in addition to Fig. 3. Fig. 4 is an exploded perspective view showing the components of the energy storage unit 200 according to the present embodiment. Note that in Fig. 4, the bus bar 250 and the bus bar frame 260 of the energy storage unit 200 are omitted.

As shown in Figures 3 and 4, the energy storage unit 200 includes energy storage elements 210 (211, 212), spacers 220 (221, 222), 223, end plates 230 (231, 232), side plates 240 (241, 242, 243), a bus bar 250, and a bus bar frame 260.

The storage element 210 is a secondary battery (single cell) capable of charging and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The storage element 210 has a flat rectangular parallelepiped shape (rectangular shape), and in this embodiment, eight storage elements 210 are arranged in the Z-axis direction and the X-axis direction in a horizontally placed (lying down) state (with the long side of the storage element 210 facing the Z-axis direction). Specifically, the four first storage elements 211 on the negative side of the X-axis are stacked (flat) in the Z-axis direction, and the four second storage elements 212 on the positive side of the X-axis are stacked (flat) in the Z-axis direction. The four first storage elements 211 and the four second storage elements 212 are arranged side by side in the X-axis direction. A detailed description of the configuration of the storage element 210 will be given later.

The number of the storage elements 210 is not particularly limited as long as a plurality of storage elements 210 are arranged in the X-axis direction. Any number of storage elements 210 may be stacked (flat) in the Z-axis direction, or any number of storage elements 210 may be arranged in the X-axis direction. The shape of the storage element 210 is not limited to the above-mentioned square shape, and may be other polygonal prism shapes, cylindrical shapes, elliptical prism shapes, oblong prism shapes, etc. The storage element 210 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 may be a capacitor. The storage element 210 may not be a secondary battery, but may be a primary battery that can use stored electricity without the user having to charge it. Furthermore, the storage element 210 may be a battery using a solid electrolyte. The storage element 210 may be a laminated storage element.

The spacers 220 (221, 222) and 223 are flat, rectangular members that are arranged adjacent to the storage element 210 on the side of the storage element 210 (in the Z-axis direction or the X-axis direction) and electrically insulate the storage element 210 from other members. The spacers 220 and 223 are formed, for example, from any electrically insulating resin material that can be used for the exterior body 100 described above.

Specifically, the spacer 221 is an intermediate spacer (inter-cell spacer) arranged in the Z-axis direction of the storage element 210. In other words, the spacer 221 is arranged between two adjacent storage elements 210 (between the two first storage elements 211 and between the two second storage elements 212) and electrically insulates the two storage elements 210. In this embodiment, three spacers 221 are arranged corresponding to the four first storage elements 211, but when the number of first storage elements 211 is other than four, the number of spacers 221 is appropriately changed according to the number of first storage elements 211. The same applies to the second storage elements 212.

The spacers 222 are end spacers arranged in the Z-axis direction of the end storage elements 210. That is, the spacers 222 are arranged between the end storage elements 210 (the end first storage elements 211 and second storage elements 212) and the end plates 230 (231, 232), and electrically insulate the end storage elements 210 from the end plates 230 (231, 232). That is, two spacers 222 are arranged on both sides of the four first storage elements 211 in the Z-axis direction, and two spacers 222 are arranged on both sides of the four second storage elements 212 in the Z-axis direction.

The spacers 223 are disposed between the energy storage element 210 and the side plates 240 (241, 242, 243) and electrically insulate the energy storage element 210 from the side plates 240 (241, 242, 243). That is, on both sides of the four first energy storage elements 211 in the X-axis direction, two spacers 223 are disposed between the four first energy storage elements 211 and the side plates 241 and 243. In addition, on both sides of the four second energy storage elements 212 in the X-axis direction, two spacers 223 are disposed between the four second energy storage elements 212 and the side plates 242 and 243.

The end plates 230 and the side plates 240 are members (restraining members) that compress (restrain) the energy storage elements 210 from the outside in the Z-axis direction. In other words, the end plates 230 and the side plates 240 sandwich the energy storage elements 210 and the spacers 220 from both sides in the Z-axis direction, thereby compressing (restraining) each of the energy storage elements 210 and the spacers 220 from both sides in the Z-axis direction. The end plates 230 and the side plates 240 are formed of metal members such as stainless steel, aluminum, aluminum alloy, iron, plated steel sheet, etc., but may also be formed of insulating members such as highly rigid resin.

The end plates 230 (231, 232) are arranged in a position sandwiching the multiple storage elements 210 (multiple first storage elements 211 and multiple second storage elements 212) and multiple spacers 220 in the Z-axis direction (stacking direction), and are a pair of flat plate-shaped members that sandwich them in the Z-axis direction. As a result, the pair of end plates 230 collectively restrain the multiple storage elements 210 and the multiple spacers 220 in the Z-axis direction (collectively apply a restraining force in the Z-axis direction to the multiple storage elements 210 and the multiple spacers 220). Note that the end plate 231 is the end plate 230 on the negative side of the Z-axis of the pair of end plates 230, and the end plate 232 is the end plate 230 on the positive side of the Z-axis. A detailed description of the configuration of the end plates 230 (end plates 231, 232) will be described later.

The side plates 240 (241, 242, 243) are flat members that are attached at both ends to a pair of end plates 230 and connect the pair of end plates 230 to restrain the multiple storage elements 210 and the multiple spacers 220. In other words, the side plates 240 are arranged extending in the Z-axis direction so as to straddle the multiple storage elements 210 and the multiple spacers 220, and apply a restraining force to the multiple storage elements 210, etc. in the arrangement direction (Z-axis direction).

In this embodiment, a side plate 241 is disposed in the negative X-axis direction of the first storage element 211, a side plate 242 is disposed in the positive X-axis direction of the second storage element 212, and a side plate 243 is disposed between the first storage element 211 and the second storage element 212. Each of the side plates 241, 242, and 243 is attached to both ends in the X-axis direction and the center of the pair of end plates 230 at both ends in the Z-axis direction. Note that a through hole is formed in the side plate 240 that penetrates in the Y-axis direction for weight reduction, etc., but the through hole does not have to be formed.

In this way, the end plate 230 and the side plate 240 sandwich and restrain the multiple energy storage elements 210 and the multiple spacers 220 from both sides in the X-axis direction and both sides in the Z-axis direction. In addition, the end plate 230 (231, 232) and each side plate 240 are connected (joined) to each other by multiple connection members 230a (231a, 232a) arranged in the Y-axis direction. In this embodiment, the connection member 230a is a bolt that penetrates the end plate 230 and is screwed into a female thread portion formed in the side plate 240 to connect (fasten) the end plate 230 and the side plate 240. The arrangement position and number of the connection members 230a are not particularly limited. In addition, the method of connecting the end plate 230 and the side plate 240 may be other methods, such as welding, crimping, adhesion, and welding.

The bus bar 250 is a flat member connected to the energy storage element 210. Specifically, the bus bar 250 is arranged in the negative Y-axis direction of the multiple energy storage elements 210 and is connected (joined) to the electrode terminals of the multiple energy storage elements 210 and the bus bar 510. In other words, the bus bar 250 connects the electrode terminals of the multiple energy storage elements 210 to each other, and connects the electrode terminals of the end energy storage elements 210 to the bus bar 510. In this embodiment, the bus bar 250 and the electrode terminals of the energy storage elements 210 are connected (joined) by welding, but may be connected (joined) by bolt fastening or the like. The bus bar 250 is formed, for example, of any material that can be used for the bus bar 510 described above. In addition, in this embodiment, the bus bar 250 connects two storage elements 210 in parallel to form four sets of storage element groups, and the four sets of storage element groups are connected in series, but the bus bar 250 may connect all eight storage elements 210 in series, or may have another configuration.

An electric wire 251 for detecting voltage, etc. is connected to the bus bar 250. The electric wire 251 is also connected to the electrical device 400, and transmits information such as the voltage of the storage element 210 to the electrical device 400. The electric wire 251 is also connected to the thermistor 252, and transmits temperature information of the storage element 210 to the electrical device 400.

The busbar frame 260 is a flat rectangular insulating member that can electrically insulate the busbar 250 from other members and can regulate the position of the busbar 250. The busbar frame 260 is formed of, for example, any electrically insulating resin material that can be used for the exterior body 100. The busbar frame 260 is arranged in the negative Y-axis direction of the multiple storage elements 210 and is positioned relative to the multiple storage elements 210. Specifically, the busbar frame 260 is attached to at least one end plate 230 of the pair of end plates 230 (both end plates 230 in this embodiment). In addition, the busbar 250, the electric wire 251, and the thermistor 252 are positioned on the busbar frame 260. As a result, the busbar 250 is positioned relative to the multiple storage elements 210 and joined to the electrode terminals of the multiple storage elements 210.

[3. Description of the Configuration of Energy Storage Element 210]
Next, the configuration of the energy storage element 210 will be described in detail. Fig. 5 is an exploded perspective view showing each component of the energy storage element 210 according to the present embodiment. Specifically, Fig. 5 shows an exploded view of each part of the energy storage element 210 shown in Fig. 4 in a vertically placed (standing) state. Note that since all eight energy storage elements 210 (four first energy storage elements 211 and four second energy storage elements 212) have the same configuration, the configuration of one energy storage element 210 will be described below.

As shown in FIG. 5, the energy storage element 210 includes a container 210a, a pair of electrode terminals 210b (positive and negative), and a pair of upper gaskets 210c (positive and negative). The container 210a also contains a pair of lower gaskets 210d (positive and negative), a pair of current collectors 210e (positive and negative), and an electrode body 210f. An electrolyte (non-aqueous electrolyte) is enclosed inside the container 210a, but is not shown. There is no particular limit to the type of electrolyte as long as it does not impair the performance of the energy storage element 210, and various electrolytes can be selected. In addition to the above components, a spacer disposed on the side or below the electrode body 210f, an insulating film that encases the electrode body 210f, or an insulating sheet that covers the outer surface of the container 210a may be disposed.

The container 210a is a rectangular parallelepiped (square or box-shaped) case having a container body 210a1 with an opening and a container lid 210a2 that closes the opening of the container body 210a1. With this configuration, the container 210a is structured so that the inside can be sealed by welding the container body 210a1 and the container lid 210a2 together after the electrode body 210f and other components are housed inside the container body 210a1. The materials of the container body 210a1 and the container lid 210a2 are not particularly limited, but are preferably weldable metals such as stainless steel, aluminum, aluminum alloy, iron, and plated steel sheet.

The container body 210a1 is a rectangular cylindrical member with a bottom that constitutes the main body of the container 210a, and has an opening on the negative Y-axis side. In other words, the container body 210a1 has a pair of rectangular, planar (flat) long sides on both sides in the Z-axis direction, a pair of rectangular, planar (flat) short sides on both sides in the X-axis direction, and a rectangular, planar (flat) bottom surface on the positive Y-axis side. The container lid 210a2 is a rectangular plate-like member that constitutes the lid of the container 210a, and is disposed extending in the X-axis direction on the negative Y-axis side of the container body 210a1.

The electrode body 210f is an electric storage element (power generation element) formed by stacking a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate is a positive electrode active material layer formed on a positive electrode base layer, which is a current collector foil made of a metal such as aluminum or an aluminum alloy. The negative electrode plate is a negative electrode active material layer formed on a negative electrode base layer, which is a current collector foil made of a metal such as copper or a copper alloy. As the active material used for the positive electrode active material layer and the negative electrode active material layer, any known material can be used as long as it can absorb and release lithium ions. In this embodiment, the electrode body 210f is a wound type (so-called vertically wound type) electrode body formed by winding the electrode plates (positive electrode plate and negative electrode plate) around a winding axis (a virtual axis parallel to the X-axis direction) extending in the X-axis direction.

Here, the electrode plates (positive and negative plates) of the electrode body 210f are stacked in the Z-axis direction, so the Z-axis direction is also called the stacking direction. In other words, the electrode body 210f is formed by stacking the electrode plates in the stacking direction. The electrode body 210f has a pair of flat parts 210f1 aligned in the Z-axis direction and a pair of curved parts 210f2 aligned in the Y-axis direction by winding the electrode plates, and the stacking direction is the stacking direction of the electrode plates in the flat part 210f1. The flat part 210f1 is a flat part that connects the ends of the pair of curved parts 210f2, and the curved part 210f2 is a part that is curved in a semicircular shape or the like so as to protrude in the Y-axis direction. The stacking direction can also be defined as the direction in which the flat surface of the flat part 210f1 faces, or the direction in which the pair of flat parts 210f1 face each other. For this reason, the multiple first storage elements 211 can be said to be arranged in the stacking direction, and the multiple second storage elements 212 can also be said to be arranged in the stacking direction. The X-axis direction in which the first storage elements 211 and the second storage elements 212 are arranged is also called the arrangement direction. In other words, the first storage elements 211 and the second storage elements 212 are arranged in an arrangement direction that intersects with the stacking direction.

In addition, the electrode body 210f has positive and negative plates wound with a mutual shift in the X-axis direction, so that the positive and negative plates have portions (active material layer non-formed portions) at the ends in the shifted direction where the active material is not formed (coated) and the substrate layer is exposed. In other words, the electrode body 210f has connection portions 210f3 at both ends in the X-axis direction that protrude from the flat portion 210f1 and the curved portion 210f2 on both sides in the X-axis direction, and are connected to the current collector 210e by stacking the active material layer non-formed portions of the positive and negative plates.

The electrode body 210f may be of any type, such as a so-called horizontally wound electrode body formed by winding an electrode plate around a winding axis extending in the Y-axis direction, a laminated (stacked) electrode body formed by stacking multiple flat electrode plates, or a bellows-shaped electrode body in which the electrode plate is folded into a bellows shape. In the case of a horizontally wound electrode body, the flat parts are the curved parts and the flat parts other than the connection parts (tabs) with the current collector, and in the case of a laminated (stacked) and bellows-shaped electrode body, the flat parts are the flat parts other than the connection parts (tabs) with the current collector.

The electrode terminals 210b are terminals (positive and negative terminals) of the storage element 210, and are arranged on the container lid 210a2 so as to protrude in the negative Y-axis direction. The electrode terminals 210b are electrically connected to the positive and negative plates of the electrode body 210f via the current collector 210e. The electrode terminals 210b are formed of a conductive material such as a metal, such as aluminum, an aluminum alloy, copper, or a copper alloy.

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

[4. Description of the Configurations of Electric Device 400, End Plate 230, and Mounting Member 300]
Next, the configurations of the electric device 400, the end plate 230 (231, 232), and the mounting member 300 will be described in detail with reference to Figs. 3 and 4 as well as Figs. 6 and 7. Fig. 6 is a perspective view showing the configurations of the electric device 400, the end plate 230, and the mounting member 300 according to this embodiment. Specifically, Fig. 6 is a perspective view showing the configurations of the electric device 400, the end plates 231, 232, and the mounting member 300 in a separated state as viewed from the negative X-axis direction. Fig. 7 is a cross-sectional view showing the configurations of the electric device 400, the end plate 230, and the mounting member 300 according to this embodiment. Specifically, Fig. 7 is a cross-sectional view showing the configurations of the electric device 400, the end plate 230, the side plate 240, and the mounting member 300 in an assembled state as cut along a plane parallel to the XZ plane and passing through the mounting member protruding portion 320 of the mounting member 300.

As shown in these figures, the electrical device 400 has an insulating cover member 400a. The cover member 400a is formed of, for example, any electrically insulating resin material that can be used for the exterior body 100. The cover member 400a also houses electrical components (electrical components) such as a circuit board 400b (see FIG. 7), a shunt resistor (not shown), and a connector (not shown). In this way, in order to house the electrical components in the cover member 400a, a space for arranging the electrical components is formed in the cover member 400a, and thus a convex portion (electrical device convex portion 420 described later) that protrudes in the negative X-axis direction is formed in the cover member 400a. Note that, for simplicity, in FIG. 7, only the circuit board 400b is shown inside the cover member 400a, but the above-mentioned electrical components and a space for housing them are formed inside the cover member 400a.

As a result, it can be said that the electrical device 400 has an electrical device main body 410 and an electrical device protrusion 420. The electrical device main body 410 is a flat rectangular part that constitutes the main body of the electrical device 400. The electrical device protrusion 420 is a protrusion that protrudes from the electrical device main body 410 toward the storage unit 200 (in the negative X-axis direction), and contains, for example, a shunt resistor, a connector, a part that holds the circuit board 400b, and the like. In other words, the electrical device protrusion 420 is not the electrical component itself, but a protrusion formed on the cover member 400a in a state in which the electrical component is covered by the cover member 400a located in the negative X-axis direction of the electrical component. In this embodiment, the electrical device protrusion 420 has two electrical device protrusions 421 and 422. The electrical device protrusion 421 is a substantially L-shaped protrusion. The electrical device protrusion 422 is a rectangular protrusion that protrudes the same amount in the X-axis direction as the electrical device protrusion 421, and is smaller than the electrical device protrusion 421 when viewed in the X-axis direction. The number and shape of the protrusions of the electrical device protrusion 420 are not particularly limited. The electrical device main body 410 is an example of a main body of the electrical device 400, and the electrical device protrusions 420 (421, 422) are an example of a first protrusion.

The end plate 230 (231, 232) has a plate connection portion 230b (231b, 232b), and the plate connection portion 230b has a plate opening 230b1 formed therein. That is, the end plate 231 has a plate connection portion 231b in which the plate opening 230b1 is formed, and the end plate 232 has a plate connection portion 232b in which the plate opening 230b1 is formed.

The plate connection portion 231b is a rectangular protrusion that is long in the Y-axis direction and protrudes in the positive X-axis direction from the end of the end plate 231 that is in the positive Y-axis direction. The plate connection portion 232b is a rectangular protrusion that is long in the Y-axis direction and protrudes in the positive X-axis direction from the end of the end plate 232 that is in the negative Y-axis direction. The plate opening 230b1 is a through hole that is long in the Y-axis direction and passes through the plate connection portion 230b (231b, 232b) in the Z-axis direction.

The mounting member 300 has a mounting member main body 310, a mounting member protrusion 320 (321, 322), a mounting member opening 330 (331, 332), and a mounting member convex portion 340. The mounting member main body 310 is a flat, rectangular portion that constitutes the main body of the mounting member 300. In this embodiment, the mounting member main body 310 is attached to the side plate 240. Specifically, the mounting member main body 310 is adhered and fixed to the side plate 242 by placing (applying) an adhesive between the mounting member main body 310 and the side plate 242.

The mounting member protrusions 320 (321, 322) are protruding parts that protrude from the mounting member main body 310 in a direction (Z-axis direction) that intersects with the arrangement direction (X-axis direction) of the storage unit 200 and the mounting member 300. The mounting member protrusions 320 (321, 322) are inserted into the plate openings 230b1 formed in the plate connection parts 230b (231b, 232b) of the end plates 230 (231, 232).

The mounting member protrusion 321 is a rectangular protrusion that is long in the Y-axis direction and protrudes in the negative Z-axis direction from the end of the mounting member main body 310 in the positive Y-axis direction and the negative Z-axis direction, and is inserted into the plate opening 230b1 formed in the plate connection part 231b of the end plate 231. The mounting member protrusion 322 is a rectangular protrusion that is long in the Y-axis direction and protrudes in the positive Z-axis direction from the end of the mounting member main body 310 in the negative Y-axis direction and the positive Z-axis direction, and is inserted into the plate opening 230b1 formed in the plate connection part 232b of the end plate 232. In this embodiment, the mounting member protrusion 321 is not inserted into the plate opening 230b1 until it penetrates (pierces) the plate connection part 231b, and the mounting member protrusion 322 is inserted into the plate opening 230b1 so as to penetrate (pierce) the plate connection part 232b.

In this way, the mounting member 300 is sandwiched in the Z-axis direction (stacking direction) by a pair of end plates 230 (231 and 232). That is, the plate connection part 231b is arranged in the negative Z-axis direction of the mounting member main body 310, and the plate connection part 232b is arranged in the positive Z-axis direction of the mounting member main body 310, and the mounting member main body 310 is sandwiched in the Z-axis direction by the plate connection parts 231b and 232b. For example, when the mounting member 300 is formed of a hard material that is difficult to deform, the pair of end plates 230 (231 and 232) sandwich the mounting member 300 in the Z-axis direction together with the storage element 210 and the spacer 220, etc., and collectively restrain them in the Z-axis direction. At that time, when manufacturing the mounting member 300 with the Z-axis direction as the up-down direction, it is preferable that the mounting member main body 310 is bonded to the side plate 242 because it is easier to manufacture if the mounting member 300 is fixed (joined) to the side plate 242.

The mounting member opening 330 is a through hole that penetrates the mounting member main body 310 in the X-axis direction, and the electrical device 400 is inserted into the mounting member opening 330 to expose the surface of the electrical device 400 facing the power storage unit 200 (the surface on the negative X-axis direction) to the power storage unit 200 side (the negative X-axis direction). Specifically, the mounting member opening 330 is inserted into the cover member 400a of the electrical device 400 to expose the surface of the cover member 400a facing the power storage unit 200 (the surface on the negative X-axis direction) to the power storage unit 200 side (the negative X-axis direction). In other words, the mounting member opening 330 is inserted into the electrical device protrusion 420 (first protrusion) of the electrical device 400 to expose the surface of the electrical device protrusion 420 facing the power storage unit 200 (the surface on the negative X-axis direction) to the power storage unit 200 side (the negative X-axis direction). That is, a portion of the cover member 400a of the electrical device 400 that corresponds to the electrical device protrusion 420 is inserted into the mounting member opening 330. The electrical device protrusion 420 is inserted into the mounting member opening 330 so that it does not protrude from the mounting member main body 310 in the negative X-axis direction.

The mounting member opening 330 has a mounting member opening 331 and a mounting member opening 332. The mounting member opening 331 is a rectangular through hole corresponding to the size and shape of the electrical device convex portion 421, and the electrical device convex portion 421 is inserted to expose the surface of the electrical device convex portion 421 in the negative X-axis direction. The mounting member opening 332 is a rectangular through hole smaller than the mounting member opening 331 and corresponding to the size and shape of the electrical device convex portion 422, and the electrical device convex portion 422 is inserted to expose the surface of the electrical device convex portion 422 in the negative X-axis direction. The mounting member opening 331 and the mounting member opening 332 are connected (connected). The size and shape of the mounting member opening 330 (331, 332) are not particularly limited as long as the electrical device convex portion 420 (421, 422) can be inserted. For example, as shown in FIG. 6, the mounting member opening 330 (331, 332) may be an opening that opens in the center of the mounting member body 310, or may be a notch shape in which the edge of the mounting member body 310 in the Y-axis direction or the Z-axis direction (the outer peripheral edge of the mounting member body 310) is recessed inward in the Y-axis direction or the Z-axis direction, respectively.

The mounting member protrusion 340 is a protrusion that is arranged around the mounting member opening 330 and protrudes toward the electrical device 400 (in the positive direction of the X-axis). Specifically, the mounting member protrusion 340 is a protrusion that extends in an elongated shape along the periphery of the mounting member opening 330, and a mounting member recess 341 that is recessed in the positive direction of the X-axis is formed on the surface on the negative X-axis side. In other words, the mounting member protrusion 340 is a bulge that bulges in the positive X-axis direction. In this embodiment, the mounting member protrusion 340 is arranged to extend in the Z-axis direction on both sides of the mounting member opening 331 in the Y-axis direction. The mounting member protrusion 340 is an example of a second protrusion.

[5. Description of Effects]
As described above, according to the energy storage device 10 according to the embodiment of the present invention, the attachment member 300 is provided between the energy storage unit 200 and the electric device 400, and the attachment member 300 has an attachment member opening 330 into which the electric device 400 is inserted and the surface of the electric device 400 facing the energy storage unit 200 is exposed to the energy storage unit 200 side. In this manner, the attachment member opening 330 is formed in the attachment member 300, and the electric device 400 is inserted into the attachment member opening 330. As a result, even when the electric device 400 is attached to the energy storage unit 200 via the attachment member 300, it is possible to suppress the size of the energy storage device 10 from increasing due to the thickness of both the electric device 400 and the attachment member 300 being added to the energy storage unit 200. For example, in order to reuse an existing electric device 400, the electric device 400 may be attached to the energy storage unit 200 via the attachment member 300 rather than directly to the energy storage unit 200. Even in this case, it is possible to suppress an increase in the dimensions of the power storage device 10 due to the addition of the thicknesses of both the electrical device 400 and the mounting member 300 to the power storage unit 200. Therefore, it is possible to suppress an increase in the dimensions of the power storage device 10 caused by mounting the electrical device 400 to the power storage unit 200.

The electrical device 400 has a main body (electrical device main body 410) and a first convex portion (electrical device convex portion 420) that protrudes toward the energy storage unit 200, and the first convex portion is inserted into the mounting member opening 330 of the mounting member 300. If the electrical device 400 has a first convex portion that protrudes toward the energy storage unit 200, there is a concern that the dimensions of the electrical device 400 may increase when the electrical device 400 is mounted to the energy storage unit 200. Therefore, the first convex portion is inserted into the mounting member opening 330 of the mounting member 300. This makes it possible to suppress an increase in the dimensions of the energy storage device 10 caused by mounting the electrical device 400 to the energy storage unit 200.

In addition, the insulating cover member 400a of the electrical device 400 is inserted into the mounting member opening 330 of the mounting member 300. When the electrical device 400 is inserted into the mounting member opening 330 of the mounting member 300 in this way, the distance between the power storage unit 200 and the electrical device 400 becomes short, so an insulating cover member 400a is provided on the electrical device 400 and the cover member 400a is inserted into the mounting member opening 330. As a result, even if the electrical device 400 is inserted into the mounting member opening 330 of the mounting member 300 and the distance between the power storage unit 200 and the electrical device 400 becomes short, insulation between the power storage unit 200 and the electrical components in the cover member 400a of the electrical device 400 can be ensured.

In addition, since the bus bar 250 is attached to the electrode terminal 210b of the energy storage element 210, if the electrical device 400 is arranged opposite the surface on which the electrode terminal 210b of the energy storage unit 200 is arranged, there is a risk of a large increase in the dimensions of the electrode terminal 210b side or a short circuit occurring. For this reason, the mounting member 300 is arranged opposite a surface of the energy storage unit 200 different from the surface on which the electrode terminal 210b is arranged. This makes it possible to attach the electrical device 400 to the energy storage unit 200 while suppressing problems such as an increase in the dimensions of the energy storage device 10.

In addition, since the mounting member 300 has a second protrusion (mounting member protrusion 340) around the mounting member opening 330 that protrudes toward the electrical device 400, the second protrusion can be used as a guide when inserting the electrical device 400 into the mounting member opening 330 and as a positioning portion. This allows the electrical device 400 to be easily inserted into the mounting member opening 330, making it easy to realize a configuration that suppresses an increase in the dimensions of the power storage device 10. In addition, since the mounting member 300 is weakened by the formation of the mounting member opening 330, the mounting member 300 can be reinforced by forming a second protrusion around the mounting member opening 330.

The energy storage unit 200 has a plurality of energy storage elements 210 arranged in an arrangement direction intersecting with the stacking direction of the electrode plates of the electrode body 210f, and the mounting member 300 is attached to at least one of the pair of end plates 230 and the side plate 240. In this manner, even in a configuration in which a plurality of energy storage elements 210 are arranged in the arrangement direction, the mounting member 300 of the electrical device 400 is attached to at least one of the pair of end plates 230 and the side plate 240. This allows the electrical device 400 to be attached to the energy storage unit 200 using the plate member, thereby making it possible to prevent the electrical device 400 from shaking relative to the energy storage unit 200 and to prevent damage to the electrical device 400.

In addition, when the mounting member 300 of the electrical device 400 is arranged in the stacking direction of the energy storage unit 200, the energy storage element 210 expands in the stacking direction, so that the mounting member 300 may come off the energy storage unit 200 or the electrical device 400 may be compressed between the exterior body 100 of the energy storage device 10, etc. For this reason, the mounting member 300 of the electrical device 400 is arranged in the arrangement direction of the energy storage unit 200. This makes it possible to prevent the mounting member 300 from coming off the energy storage unit 200 or the electrical device 400 from being compressed between the exterior body 100, etc., so that damage to the electrical device 400 can be suppressed. In addition, since the energy storage element 210 is arranged in the arrangement direction, the energy storage unit 200 becomes longer in the arrangement direction, so that the surface on the side different from the arrangement direction of the energy storage unit 200 becomes larger in area. For this reason, when the mounting member 300 is arranged on the side different from the arrangement direction of the energy storage unit 200, the width between the surfaces with large areas becomes larger. Therefore, by arranging the mounting members 300 in the same direction as the storage units 200, space can be saved.

In addition, by attaching the mounting member 300 of the electrical device 400 to both of the pair of end plates 230, the mounting member 300 can be attached firmly and in a balanced manner to the energy storage unit 200. This can further prevent the electrical device 400 from shaking relative to the energy storage unit 200, thereby preventing damage to the electrical device 400.

Although the energy storage element 210 expands in the stacking direction, the side plate 240 is not arranged in the stacking direction of the energy storage element 210, so it is not easily deformed even if the energy storage element 210 expands. For this reason, the mounting member 300 of the electrical device 400 is attached to the side plate 240. This makes it possible to prevent the mounting member 300 from coming off the energy storage unit 200, so that the electrical device 400 can be prevented from shaking relative to the energy storage unit 200, and damage to the electrical device 400 can be prevented. Furthermore, by attaching the mounting member 300 to the side plate 240 in addition to the end plate 230, the mounting member 300 can be attached more firmly to the energy storage unit 200. This makes it possible to further prevent the electrical device 400 from shaking relative to the energy storage unit 200, and therefore damage to the electrical device 400 can be further prevented.

In addition, since the mounting member 300 has the mounting member protrusion 320 and the end plate 230 has the plate opening 230b1 into which the mounting member protrusion 320 is inserted, the mounting member 300 can be attached to the energy storage unit 200 with a simple configuration. In addition, since there is no need to provide fastening members such as bolts when attaching the mounting member 300 to the energy storage unit 200, it is possible to reduce the number of parts, reduce weight, and save space. In particular, it is possible to reduce problems such as the bolt piercing the energy storage element 210 when the energy storage device 10 is deformed due to a crash or the like. In addition, it is possible to solve problems (such as the need for a dedicated tool or the inability to remove and reassemble when an assembly failure occurs) that occur when attaching the mounting member 300 to the energy storage unit 200 by joining such as heat crimping.

The mounting member protrusion 320 of the mounting member 300 protrudes in a direction intersecting the arrangement direction of the power storage unit 200 and the mounting member 300, and is inserted into the plate opening 230b1 of the end plate 230. In this way, the mounting member protrusion 320 protrudes in a direction intersecting the arrangement direction and is inserted into the plate opening 230b1, so that even if the mounting member 300 tries to come off the power storage unit 200, the mounting member protrusion 320 is unlikely to come off the plate opening 230b1. This makes it possible to prevent the mounting member 300 from coming off the power storage unit 200, and therefore to prevent the electric device 400 from swinging relative to the power storage unit 200, thereby suppressing damage to the electric device 400.

[6. Description of Modifications]
Although the power storage device 10 according to the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. In other words, the embodiment disclosed herein is illustrative and not restrictive in all respects, and the scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope equivalent to the claims.

For example, in the above embodiment, the energy storage unit 200 has a plurality of energy storage elements 210 arranged in the arrangement direction, but the energy storage elements 210 do not have to be arranged in the arrangement direction. In other words, the energy storage unit 200 may have a plurality of energy storage elements 210 arranged in the stacking direction, or may have only one energy storage element 210.

In addition, in the above embodiment, the electrical device 400 has an insulating cover member 400a, but the cover member 400a may be conductive, or the electrical device 400 may not have a cover member 400a.

In the above embodiment, the mounting member 300 is arranged in the positive direction of the X-axis of the energy storage unit 200. However, the mounting member 300 may be arranged in the negative direction of the X-axis of the energy storage unit 200, or in the positive direction of the Y-axis, positive direction of the Z-axis, or negative direction of the Z-axis of the energy storage unit 200. In other words, the mounting member 300 may be arranged facing a surface of the energy storage unit 200 that is different from the surface on which the electrode terminal 210b is arranged. Alternatively, the mounting member 300 may be arranged facing the surface of the energy storage unit 200 on which the electrode terminal 210b is arranged (arranged in the negative direction of the Y-axis of the energy storage unit 200).

In addition, in the above embodiment, the mounting member 300 has a second convex portion (mounting member convex portion 340), but it does not have to have a second convex portion.

In the above embodiment, the mounting member 300 has a protrusion (mounting member protrusion 320), and both of the pair of end plates 230 have an opening (plate opening 230b1) into which the protrusion is inserted. However, only one of the pair of end plates 230 may have an opening into which the protrusion of the mounting member 300 is inserted. Or, the side plate 240 may have an opening into which the protrusion of the mounting member 300 is inserted. In other words, at least one of the pair of end plates 230 and side plate 240 may have an opening into which the protrusion of the mounting member 300 is inserted. Also, the plate member may have a protrusion, and the mounting member 300 may have an opening into which the protrusion is inserted. In this way, it is sufficient that one of the plate member and the mounting member 300 has a protrusion, and the other has an opening into which the protrusion is inserted. The opening may not be a through hole, but may be a recess (notch) recessed in the Y-axis direction.

In other words, the mounting member 300 only needs to be attached to at least one of the pair of end plates 230 and side plate 240. In other words, the mounting member 300 does not need to be attached to the side plate 240. In this case, the side plate 240 may be disposed in the positive Y-axis direction or the negative Y-axis direction of the energy storage element 210. Alternatively, the energy storage unit 200 may not have a side plate 240. Also, the mounting member 300 may be attached to the side plate 240 without being attached to either of the end plates 230. Alternatively, the mounting member 300 may not be attached to either the end plate 230 or the side plate 240.

Furthermore, the energy storage device 10 does not need to include all of the components described above. For example, the energy storage device 10 does not need to include the spacers 220, 223, the bus bar frame 260, the thermistor 252, or the relay 520, etc.

In addition, configurations constructed by arbitrarily combining the components included in the above embodiments and their variations are also included within the scope of the present invention.

The present invention can be realized not only as an energy storage device 10, but also as a mounting member 300, or a combination of a mounting member 300 and an electrical device 400.

The present invention can be applied to a storage device equipped with a storage element such as a lithium-ion secondary battery.

REFERENCE SIGNS LIST 10 Energy storage device 100 Exterior body 200 Energy storage unit 210 Energy storage element 210a Container 210b Electrode terminal 210e Current collector 210f Electrode body 210f1 Flat portion 210f2 Curved portion 211 First energy storage element 212 Second energy storage element 230, 231, 232 End plate 230b, 231b, 232b Plate connection portion 230b1 Plate opening 240, 241, 242, 243 Side plate 250, 510 Bus bar 300 Mounting member 310 Mounting member main body 320, 321, 322 Mounting member protruding portion 330, 331, 332 Mounting member opening 340 Mounting member convex portion 341 Mounting member concave portion 400 Electrical equipment 400a Cover member 400b Circuit board 410 Electric device body 420, 421, 422 Electric device protrusion

Claims (4)

A power storage device including a power storage unit having a power storage element and an electric device attached to the power storage unit,
a mounting member disposed between the power storage unit and the electric device, the mounting member being attached to the power storage unit and to which the electric device is attached;
The mounting member is
an opening into which the electrical device is inserted, exposing a surface of the electrical device facing the power storage unit to the power storage unit;
a second protrusion extending along a periphery of the opening and protruding toward the electric device . the electrical device has a main body and a first protrusion protruding from the main body toward the power storage unit,
The power storage device according to claim 1 , wherein the opening receives the first protrusion and exposes a surface of the first protrusion facing the power storage unit to a side of the power storage unit. The electrical device has an insulating cover member,
The power storage device according to claim 1 , wherein the cover member is inserted into the opening so that a surface of the cover member facing the power storage unit is exposed to a side of the power storage unit. The storage element has an electrode terminal,
The power storage device according to any one of claims 1 to 3, wherein the attachment member is disposed so as to face a surface of the power storage unit different from a surface on which the electrode terminals are disposed.

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