JP2022186464A - power storage device - Google Patents

Abstract

To provide a power storage device that can change the position of an external terminal.SOLUTION: A power storage device 1 including a power storage element 400 includes: a first conductive member 920 arranged on a main current path of the power storage element 400 and connectable to a first external terminal 41; a second conductive member 930 that is electrically connectable to the first conductive member 920 and is connectable to a second external terminal 22 which is an external terminal having the same polarity as the first external terminal 41 and is arranged at one end in a longitudinal direction of the power storage device 1; and a connection member 40 that is arranged at the other end in the longitudinal direction of the power storage device 1, the connection member 40 having any one of a first external terminal 41 connected to the first conductive member 920 and not connected to the second conductive member 930 and a connection portion 43 electrically connecting the first conductive member 920 and the second conductive member 930.SELECTED DRAWING: Figure 7

Description

TECHNICAL FIELD The present invention relates to a power storage device including power storage elements and external terminals.

2. Description of the Related Art Conventionally, a power storage device including a power storage element and an external terminal is known. For example, Patent Literature 1 discloses an assembled battery (power storage device) including battery cells (power storage elements) and LOAD terminals and the like (external terminals).

JP 2018-125251 A

The layout of the power storage device is often restricted because it is arranged in a narrow space, and it is sometimes desired to change the position of the external terminal depending on the situation. However, in the above-described conventional power storage device, the positions of the external terminals are fixed and cannot be changed.

SUMMARY OF THE INVENTION The present invention has been made by the inventor of the present application by focusing on the above problem, and an object of the present invention is to provide a power storage device in which the positions of external terminals can be changed.

To achieve the above object, a power storage device according to one aspect of the present invention is a power storage device including a power storage element, wherein a first power storage device is arranged on a main current path of the power storage device and connectable to a first external terminal. a first conductive member; and a second external terminal which is electrically connectable to the first conductive member and has the same polarity as the first external terminal and which is arranged at one end in the longitudinal direction of the power storage device. and a connecting member arranged at the other end in the longitudinal direction of the power storage device, the connecting member being connected to the first conductive member and not connected to the second conductive member. An external terminal and a connection member having either one of a connection portion for electrically connecting the first conductive member and the second conductive member are provided.

According to this, the power storage device includes a first conductive member connectable to the first external terminal, a second conductive member connectable to the first conductive member and the second external terminal, the first external terminal, and the second a connection member having either one of connection portions for connecting the first conductive member and the second conductive member. The second external terminal is arranged at one end in the longitudinal direction of the power storage device, and the connecting member is arranged at the other end in the longitudinal direction of the power storage device. Accordingly, when the connection member has the first external terminal, the first external terminal is connected to the first conductive member, so that the first external terminal connected to the first conductive member serves as the external terminal of the power storage device. Become. When the connection member has a connection portion, the first conductive member and the second conductive member to which the second external terminal is connected are connected, so that the second external terminal connected to the second conductive member is charged. It becomes the external terminal of the device. That is, when the connection member has the first external terminal, the first external terminal as the external terminal is arranged at the connection position (the other end in the longitudinal direction of the power storage device) with the first conductive member. Become. When the connection member has a connection portion, a second external terminal as an external terminal is arranged at the connection position (one end in the longitudinal direction of the power storage device) with the second conductive member. In this way, since the external terminal can be changed to the first external terminal or the second external terminal, the position of the external terminal can be changed (one end and the other end in the longitudinal direction of the power storage device can be switched). )be able to.

Further, an exterior body in which the electric storage element is housed may be provided, and the connection member may be arranged in a state of penetrating the exterior body.

According to this, the connection member is arranged in a state of penetrating the exterior body, so that the connection member can be attached and detached from the outside of the exterior body. Thus, the external terminal can be easily changed to the first external terminal or the second external terminal by attaching/detaching the first external terminal as the connection member or attaching/detaching the connection part from the outside of the package. Therefore, the positions of the external terminals can be easily changed.

Further, the connection member has the connection portion, and the power storage device includes the second external terminal connected to the second conductive member at the one end portion in the longitudinal direction of the power storage device. may

According to this, the connecting member has the connecting portion, and the second external terminal is used as the external terminal instead of the first external terminal by connecting the second external terminal to the second conductive member. That is, the position of the external terminal is changed from the position where it is connected to the first conductive member (the position of the connection member) to the position where it is connected to the second conductive member (one end in the longitudinal direction of the power storage device). . Thus, the positions of the external terminals can be easily changed.

Also, the second external terminal may be detachably connected to the second conductive member.

According to this, since the second external terminal is configured to be detachable from the second conductive member, the shape of the second external terminal can be easily changed, and maintenance or replacement of the second external terminal can be easily performed. can be done.

The present invention can be realized not only as a power storage device, but also as a combination of a first conductive member, a second conductive member, and a connection member.

According to the power storage device of the present invention, the positions of the external terminals can be changed.

1 is a perspective view showing an appearance of a power storage device according to an embodiment; FIG. FIG. 3 is an exploded perspective view showing each constituent element of the power storage unit according to the embodiment; FIG. 3 is an exploded perspective view showing each constituent element of the power storage unit according to the embodiment; 1 is an exploded perspective view showing each component by disassembling a power storage device according to an embodiment; FIG. FIG. 2 is a perspective view showing a configuration of a connection member and its surroundings according to an embodiment; FIG. 4 is a perspective view showing a positional relationship among a first exterior body, a conductive member, and an external terminal of a connection member according to the embodiment; FIG. 4 is a perspective view showing the positional relationship among the mounting base of the first exterior body, the conductive member, and the external terminal (and connecting portion) according to the embodiment; FIG. 3 is a perspective view showing a configuration in which the power storage device according to the embodiment includes a connection member;

Hereinafter, power storage devices according to embodiments of the present invention (including modifications thereof) will be described with reference to the drawings. It should be noted that the embodiments described below are all comprehensive or specific examples. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, manufacturing processes, order of manufacturing processes, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. Also, in each drawing, dimensions and the like are not strictly illustrated. Furthermore, in each figure, the same reference numerals are given to the same or similar components.

In the following description and drawings, the longitudinal direction of (the exterior body of) the power storage device, the arrangement direction of a plurality of power storage elements such as the first power storage element and the second power storage element, the alignment direction of the power storage unit and the control unit, the power storage element , or the direction in which a pair of electrode terminals are arranged in one storage element is defined as the X-axis direction. The direction in which the electric storage elements and the busbars are arranged, or the direction in which the main body and lid of the container for the electric storage elements are arranged is defined as the Y-axis direction. The direction in which the main body and the lid of the exterior body are arranged, the direction in which the storage element and the restraining body are arranged, the direction in which the storage element and the spacer are arranged, the direction in which the long sides of the container of the storage element face each other, the direction of the electrode plate of the electrode body of the storage element The stacking direction or vertical direction is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that cross each other (perpendicularly in this embodiment). Although the Z-axis direction may not be the vertical direction depending on the mode of use, the Z-axis direction will be described below for convenience of explanation.

Further, in the following description, for example, the positive direction of the X-axis indicates the direction of the arrow of the X-axis, and the negative direction of the X-axis indicates the opposite direction to the positive direction of the X-axis. The same applies to the Y-axis direction and the Z-axis direction. Also, hereinafter, the Z-axis direction may also be referred to as the first direction, the Y-axis direction may also be referred to as the second direction, and the X-axis direction may also be referred to as the third direction. Furthermore, expressions indicating relative directions or orientations such as parallel and orthogonal include cases where they are not strictly the directions or orientations. For example, two directions are orthogonal, not only means that the two directions are completely orthogonal, but also substantially orthogonal, that is, for example, a difference of about several percent It is also meant to include

(Embodiment)
[1 General description of power storage device 1]
First, a schematic configuration of a power storage device 1 according to the present embodiment will be described. FIG. 1 is a perspective view showing the appearance of a power storage device 1 according to this embodiment. FIG. 2 and FIG. 3 are exploded perspective views showing respective constituent elements of power storage unit 10 according to the present embodiment. Specifically, FIG. 2 shows a configuration in which the second exterior body 120 and the like are separated from the exterior body 100 in the power storage unit 10 and the connection member 40 is separated from the second exterior body 120 . FIG. 3 shows an exploded view of each component fixed to first exterior body 110 of power storage unit 10 shown in FIG. 2 .

The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in the present embodiment. For example, the power storage device 1 is a battery module (assembled battery) used for power storage or power supply. Specifically, the power storage device 1 is, for example, an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a rolling stock for an electric railway. It is used as a battery etc. Examples of such vehicles include electric vehicles (EV), hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), and gasoline vehicles. Examples of railway vehicles for the electric railway include electric trains, monorails, linear motor cars, and hybrid trains having both diesel engines and electric motors. In addition, the power storage device 1 can also be used as a stationary battery or the like used for home use or a power generator.

As shown in FIGS. 1 to 3, the power storage device 1 includes a power storage unit 10 and a control unit 20. FIG. Hereinafter, the portion of the power storage device 1 that has the power storage element 400 is referred to as power storage unit 10 , and the portion that includes a control device for controlling power storage element 400 is referred to as control unit 20 . Since power storage device 1 has a shape that is long in the X-axis direction, the end of power storage device 1 in the positive direction of the X-axis is hereinafter also referred to as one end in the longitudinal direction of power storage device 1 . The end in the negative direction of the X axis is also called the other end in the longitudinal direction of power storage device 1 . The power storage unit 10 includes an exterior body 100, a connecting member 40, and a first reinforcing member 200. Inside the exterior body 100, an energy storage element 400, a spacer 500, a restraint body 600, a busbar frame 700, a busbar 800, the conductive member 900, the control unit 20, and the like are accommodated. A pair of (positive electrode side and negative electrode side) external terminals 21 and 22 and a connector 23 are arranged in the exterior body 100 . Each component will be described in detail below.

[1.1 Explanation of exterior body 100]
The exterior body 100 is a box-shaped (substantially rectangular parallelepiped) container (module case) that constitutes the exterior body of the power storage device 1 . That is, the exterior body 100 is arranged outside the power storage elements 400 and the like, fixes the power storage elements 400 and the like at predetermined positions, and protects them from impacts and the like. The exterior body 100 has a first exterior body 110 , a second exterior body 120 , a fixing member 130 and a second reinforcing member 300 .

The first exterior body 110 is a flat rectangular member forming the main body of the exterior body 100, and the power storage element 400 and the like are placed and fixed thereon. The second exterior body 120 is a bottomed rectangular cylindrical member that constitutes the lid of the exterior body 100, is arranged in the positive Z-axis direction of the first exterior body 110, and is connected to the first exterior body 110. cover the power storage element 400 and the like. That is, the second exterior body 120 has an opening in the negative direction of the Z axis, and the first exterior body 110 is arranged so as to block the opening of the second exterior body 120 .

For example, the first exterior body 110 is a metal member such as stainless steel, aluminum, aluminum alloy, iron, or steel plate, or is subjected to insulation treatment such as insulation coating from the viewpoint of ensuring safety (resistance to crushing). It is formed of a highly rigid member such as the metal member. For example, from the viewpoint of weight reduction, the second exterior body 120 is made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (modified PPE including)), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether monkey It is formed of a resin member (insulating member) such as phone (PES), ABS resin, or a composite material thereof. The first exterior body 110 may be made of the same resin member as the second exterior body 120, but is preferably made of a highly rigid member. Also, the second exterior body 120 may be formed of the same metal member as the first exterior body 110 .

The first exterior body 110 has a first connection portion 111 , mounts 113 , 114 , 115 and 117 , and an exterior body convex portion 116 . The second exterior body 120 has a second connection portion 121 and an opening portion 122 .

The first connection portion 111 is a portion (flange portion) that is arranged on the outer peripheral portion of the first exterior body 110 and has an angular annular shape (as viewed from the Z-axis direction) in a top view (flange portion). It is arranged at a position facing the connecting portion 121 , overlapped with the second connecting portion 121 and connected to the second connecting portion 121 . Similarly, the second connection portion 121 is a rectangular ring-shaped portion (flange portion) in a top view that is arranged on the outer peripheral portion of the second exterior body 120, and is arranged at a position facing the first connection portion 111. It is superimposed on the one connection portion 111 and connected to the first connection portion 111 . That is, the first connection portion 111 and the second connection portion 121 are connection portions that are superimposed and connected to each other in the Z-axis direction (first direction), and are connected in the Y-axis direction (second direction intersecting the first direction). ) and the X-axis direction (the third direction intersecting the first direction and the second direction).

Mounting bases 113 and 114 are members to which restraint body 600 is attached. Specifically, the mounting base 113 is arranged at the end of the first exterior body 110 in the negative Y-axis direction, and is attached to a portion of the restraining body 600 on the negative Y-axis direction side of the first restraining body 610 described later. The mounting base 114 is arranged at the end of the first exterior body 110 in the positive Y-axis direction, and the portion of the first restricting body 610 on the positive Y-axis direction side is attached thereto. More specifically, mounting bases 113 and 114 have bolt portions, and by screwing the bolt portions with nuts, restraining body 600 (first restraining body 610) is attached to mounting bases 113 and 114. It is attached.

The mounts 115 and 117 are members to which the conductive member 900 is attached. Specifically, the mounting base 115 is arranged at the center of the first exterior body 110 in the X-axis direction and at the end in the positive Y-axis direction, and mounting portions 913 and 933 of the conductive member 900, which will be described later, are mounted thereon (FIG. 6). reference). The mount 117 is arranged at the end of the first exterior body 110 in the negative direction of the X-axis and the positive direction of the Y-axis, and the connecting portions 921 and 932 (described later) of the conductive member 900 are attached thereto (see FIG. 6). More specifically, mounting bases 115 and 117 have bolt portions, and when the bolt portions are screwed with nuts, conductive member 900 (mounting portions 913 and 933 and , connections 921 and 932) are attached.

Exterior body convex portion 116 is a convex portion that protrudes toward power storage element 400 . Specifically, the exterior body convex portion 116 is disposed in the center portion of the first exterior body 110 in the Y-axis direction, and has a rectangular shape in a top view and a bulging portion (bulge part). Four exterior body protrusions 116 are arranged side by side in the X-axis direction corresponding to the four power storage elements 400 aligned in the X-axis direction. Each convex portion 116 of the exterior body is arranged at a position facing the central portion of a long side surface 411 a of the storage element 400 , which will be described later, and presses the central portion of the storage element 400 .

The opening 122 is a through hole formed at a corner of the second exterior body 120 in the negative direction of the X axis and the positive direction of the Y axis and penetrating the corner of the second exterior body 120 in the Z axis direction. It is closed by member 40 . That is, the opening 122 is closed by attaching the connecting member 40 to the second exterior body 120 while the connecting member 40 is inserted into the opening 122 .

A control wire (also referred to as a communication line, control line, communication cable, or control cable) that transmits information such as the voltage or temperature of the storage element 400 is connected to the control unit 20 in the second exterior body 120 . Thus, information such as the voltage or temperature of the storage element 400 is transmitted to and from the control unit 20 . Also, the control unit 20 is electrically connected to the connector 23, thereby transmitting the information to the outside.

The second reinforcing member 300 is a member arranged at a position sandwiching the second exterior body 120 with the first exterior body 110 and extending along the outer peripheral portions of the first exterior body 110 and the second exterior body 120. . That is, the second reinforcing member 300 is arranged at a position sandwiching the second connecting portion 121 with the first connecting portion 111 and extends in the X-axis direction or the Y-axis direction (the third direction or the second direction). In this embodiment, four second reinforcing members 300 are arranged over substantially the entire outer peripheral portions of the first exterior body 110 and the second exterior body 120 . In other words, the second reinforcing member 300 is arranged to extend over the plurality of fixing members 130 . The second reinforcing member 300 is formed of a metal member such as stainless steel, aluminum, an aluminum alloy, iron, or steel plate, or a highly rigid member such as the metal member subjected to insulation treatment such as insulating coating. Therefore, the second exterior body 120 (the second connection portion 121) is more rigid than at least one of the first exterior body 110 (the first connection portion 111) and the second reinforcing member 300 (in this embodiment, both of them). is low.

The fixing member 130 is a member that connects (joins) the first exterior body 110 and the second exterior body 120 . Specifically, a plurality of fixing members 130 are arranged side by side at substantially equal intervals in the first connection portion 111 and the second connection portion 121, and the first connection portion 111 and the second connection portion 121 are arranged as the second reinforcing member 300 are connected (bonded) together. In this embodiment, fixing member 130 is formed of a bolt and a nut with which the bolt is screwed. A through-hole 111a is formed in the first connecting portion 111, and through-holes (not shown) are formed in the second connecting portion 121 and the second reinforcing member 300 as well. is inserted and screwed with the nut. As a result, the fixing member 130 presses the second reinforcing member 300 toward the second connecting portion 121 with the second connecting portion 121 sandwiched between the first connecting portion 111 and the second reinforcing member 300, thereby The one connection portion 111 and the second connection portion 121 are connected (fixed). The method of connecting (joining) the first exterior body 110 and the second exterior body 120 may be other methods, such as riveting, caulking, clipping, bonding, welding, heat sealing, ultra Sonic welding or the like may be used.

[1.2 Description of Connection Member 40 and First Reinforcing Member 200]
The connection member 40 is a member arranged in a state of penetrating the exterior body 100 . Specifically, the connection member 40 is detachably attached to the second exterior body 120 while passing through the opening 122 of the second exterior body 120 to close the opening 122 . The connection member 40 is a member arranged at the other end (the end in the negative X-axis direction) of the power storage device 1 in the longitudinal direction (X-axis direction). Here, the connection member 40 shown in FIGS. 1 and 2 is also called a connection member 40a. The connection member 40 ( 40 a ) has an external terminal 41 and a cover member 42 .

The external terminal 41 is a member that can serve as a module terminal (general terminal) of the power storage device 1 . The external terminal 41 is made of a conductive member made of metal such as aluminum, aluminum alloy, copper, copper alloy, or the like. The cover member 42 is a member formed in a shape corresponding to the opening 122 to close the opening 122 . The cover member 42 is formed of an insulating member such as any resin material that can be used for the second exterior body 120 . The external terminal 41 is attached to the cover member 42 by insert molding or the like while penetrating in the Z-axis direction. That is, when the cover member 42 closes the opening 122 , the end of the external terminal 41 in the Z-axis positive direction protrudes outward from the second exterior body 120 (Z-axis positive direction), and the Z-axis of the external terminal 41 The end in the negative direction is arranged inside the second exterior body 120 (Z-axis negative direction). A detailed description of the configuration of the connection member 40 will be given later.

The first reinforcing member 200 is a plate-shaped member arranged along the exterior body 100 and aligned with the power storage element 400 in the Z-axis direction (first direction). The first reinforcing member 200 is attached to the outer surface of the exterior body 100 . Specifically, the first reinforcing member 200 has a rectangular shape extending in the X-axis direction along the first exterior body 110 in the negative Z-axis direction of the power storage element 400 and the first exterior body 110. It is a corrugated member. The first reinforcing member 200 abuts and is attached to the outer surface of the first exterior body 110 on the negative Z-axis direction side. The first reinforcing member 200 may be formed by bending a plate member into a corrugated plate shape, or may be formed by casting (die casting) or the like. In the present embodiment, the first reinforcing member 200 is attached to the first connecting portion 111 together with the second connecting portion 121 and the second reinforcing member 300 by the fixing member 130 at both ends in the X-axis direction.

[1.3 Explanation of each component in the exterior body 100]
The storage element 400 is a secondary battery (single battery) capable of charging and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage elements 400 have a flattened rectangular parallelepiped shape (rectangular shape). 411a faces the Z-axis direction), and are arranged in the Z-axis direction and the X-axis direction. Specifically, two first power storage elements 401 are stacked (flat stacked) in the Z-axis direction, two second power storage elements 402 are stacked (flat stacked) in the Z-axis direction, and two third power storage elements 403 are stacked (flat stacked). are stacked (flat stacked) in the Z-axis direction, and two fourth power storage elements 404 are stacked (flat stacked) in the Z-axis direction. Then, the two first storage elements 401, the two second storage elements 402, the two third storage elements 403, and the two fourth storage elements 404 move from the negative direction of the X axis to the positive direction of the X axis, They are arranged side by side in the X-axis direction.

The number of power storage elements 400 is not particularly limited, and any number of power storage elements 400 may be arranged (stacked) in the Z-axis direction, and how many power storage elements 400 may be arranged (arranged) in the X-axis direction. may have been The shape of the electric storage element 400 is not limited to the rectangular shape described above, and may be other shapes such as a polygonal columnar shape, a cylindrical shape, an elliptical columnar shape, and an oval columnar shape. The storage element 400 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 power storage element 400 may be a primary battery that can use stored electricity without being charged by the user, instead of a secondary battery. Electric storage element 400 may be a battery using a solid electrolyte. The storage element 400 may be a pouch-type storage element. A detailed description of the configuration of the storage element 400 will be given later.

Spacer 500 is a rectangular and plate-like spacer arranged adjacent to power storage element 400 . Spacer 500 is arranged in the Z-axis plus direction or the Z-axis minus direction of storage element 400 , facing long side surface 411 a of storage element 400 . The spacer 500 is formed of an insulating member such as any resin material that can be used for the second exterior body 120, or a member having a high heat insulating property such as a damper material.

In this embodiment, an intermediate spacer 510 and a pair of end spacers 520 are arranged as spacers 500 . The intermediate spacer 510 is the spacer 500 arranged between the two power storage elements 400, and the end spacer 520 is the spacer 500 arranged between the power storage element 400 and the first exterior body 110 or the restraining body 600. . That is, the intermediate spacer 510 and the pair of end spacers 520 are arranged so as to sandwich the power storage element 400 in the Z-axis direction, and between the power storage elements 400 and between the power storage elements 400 and the first exterior body 110 and the restraining body 600 . electrically insulate between In the present embodiment, since the first power storage element 401 to the fourth power storage element 404 are arranged side by side in the X-axis direction, the intermediate spacer 510 is provided for each of the first power storage element 401 to the fourth power storage element 404. and a pair of end spacers 520 are arranged. In place of spacer 500 or in addition to spacer 500, an insulating sheet may be arranged on the side surface of power storage element 400. FIG.

Two protrusions 521 arranged in the X-axis direction are formed at the ends in the Y-axis negative direction of each of the end spacers 520 arranged on the Z-axis positive direction side. The protrusion 521 is inserted into a circular through-hole 611 formed in a first restraining body 610 and a circular through-hole 621 formed in a second restraining body 620 of a restraining body 600 described later in the Z-axis plus direction. It is a columnar protrusion protruding into the Thereby, the restraining body 600 can be positioned with respect to the spacer 500 (and the storage element 400).

The restraint body 600 is a member that sandwiches a plurality of power storage elements 400 such as the first power storage element 401 and the second power storage element 402 together with the first exterior body 110 in the Z-axis direction. Specifically, first exterior body 110 and restraint body 600 are joined together to sandwich a plurality of power storage elements 400 . Thereby, the first exterior body 110 and the restraining body 600 restrain the plurality of power storage elements 400 in the Z-axis direction (apply a restraining force in the Z-axis direction to the plurality of power storage elements 400). That is, the first exterior body 110 is arranged so as to extend in the X-axis direction so as to straddle the first storage element 401 to the fourth storage element 404. Each of the storage elements 404 is individually constrained with the first exterior body 110 . The restraint body 600 is formed of a metal member or the like that can be used for the first exterior body 110 .

The restraining body 600 has a first restraining body 610 and a second restraining body 620 . The first restraint body 610 is a plate-like member arranged in the positive Z-axis direction of the second restraint body 620 and joined to the first exterior body 110 and having an inverted U shape when viewed from the X-axis direction. The second restraint body 620 is a plate-like member arranged so as to cover substantially the entire side surface of the power storage element 400 and the spacer 500 (end spacer 520) in the positive Z-axis direction. The first restraint body 610 and the second restraint body 620 are formed with protrusions (bulges) extending in the Y-axis direction in order to improve strength. The position, shape, and number are not particularly limited, and a configuration in which no convex portion (bulging portion) is formed may be employed. Furthermore, the first restraint 610 and the second restraint 620 may be integrally formed, or the restraint 600 may not have the second restraint 620 .

The first storage element 401 to the fourth storage element 404 are arranged apart from each other, and the restraining bodies 600 arranged in the X-axis direction are also arranged apart from each other. Therefore, for example, heat transfer between the first storage element 401 and the second storage element 402 can be suppressed, so that the first storage element 401 and the second storage element 402 do not affect each other thermally. can be suppressed. A heat insulating material may be placed in the gap between the first storage element 401 and the second storage element 402, thereby further suppressing the thermal influence of the first storage element 401 and the second storage element 402 on each other. can do.

The busbar frame 700 is a flat rectangular insulating member capable of electrically insulating the busbar 800 from other members and regulating the position of the busbar 800 . The busbar frame 700 is made of, for example, any resin material that can be used for the second exterior body 120 . The busbar frame 700 is arranged in the Y-axis negative direction of the plurality of power storage elements 400 and is positioned with respect to the plurality of power storage elements 400 , so that the busbar 800 is positioned with respect to the plurality of power storage elements 400 . It is joined to the electrode terminals of the plurality of power storage elements 400 .

The bus bar 800 is a plate-like member arranged in the Y-axis negative direction of the plurality of power storage elements 400 and connected (bonded) to the plurality of power storage elements 400 and the conductive member 900 . Busbar 800 includes busbars 810 , 820 and 830 . Bus bar 810 connects electrode terminals 420 (to be described later) of adjacent storage elements 400 to each other. The bus bars 820 and 830 connect the electrode terminals 420 of the storage element 400 and the later-described connecting portions 912 and 922 of the conductive member 900 to connect the storage element 400 to the positive and negative external terminals 21 and 41 or 22 are electrically connected.

In the present embodiment, bus bar 800 and electrode terminal 420 of power storage element 400 are connected (joined) by welding, but may be connected (joined) by bolting or the like. Bus bar 800 and connecting portions 912 and 922 of conductive member 900 are connected (joined) by bolting, but may be connected (joined) by welding or the like. The bus bar 800 is made of, for example, a conductive member made of metal such as aluminum, aluminum alloy, copper, copper alloy, nickel, or a combination thereof, or a conductive member other than metal. In the present embodiment, the bus bar 800 connects two power storage elements 400 in parallel to form four sets of power storage element groups, and connects the four power storage element groups in series. All eight power storage elements 400 may be connected in series, or other configurations may be used.

Conductive member 900 is a conductive member that is connected to bus bar 800 , connecting member 40 and control unit 20 to electrically connect power storage element 400 to external terminal 21 and external terminal 41 or 22 . That is, the conductive member 900 is a conductive member (also referred to as a power line, power line, main circuit cable, power cable, or power cable) arranged on the main current path of the storage element 400 . The main current path of the power storage element 400 is the main current of the power storage element 400 , that is, the path of the current (charge/discharge current) flowing through the electrode body 460 of the power storage element 400 , which will be described later. In other words, the conductive member 900 is a member that is arranged on the path between the storage element 400 and the external terminals 40 (41 and 42) and through which charging/discharging current flows when the storage device 1 is charged/discharged. The conductive member 900 is made of, for example, a conductive member made of metal such as aluminum, aluminum alloy, copper, copper alloy, or nickel, a combination thereof, or a conductive member other than metal.

Conductive member 900 includes conductive members 910 , 920 and 930 . The conductive member 910 has connecting portions 911 and 912 and a mounting portion 913 . The conductive member 920 has connecting portions 921 and 922 . The conductive member 930 has connecting portions 931 and 932 and a mounting portion 933 .

As described above, connection portion 912 is a portion connected to bus bar 820 , and connection portion 922 is a portion connected to bus bar 830 . The attachment portions 913 and 933 are portions attached to the attachment base 115 of the first exterior body 110 as described above. The connection portion 921 is a portion that can be connected to the external terminal 41 or a connection portion 43 described later, and the connection portion 932 is a portion that can be connected to the connection portion 43 (see FIG. 7).

In the present embodiment, conductive member 910 has a configuration in which a plate member extends from connection portion 911 to attachment portion 913 and an electric wire extends from attachment portion 913 to connection portion 912 . is doing. The conductive member 920 has a configuration in which an electric wire extends from the connection portion 921 to the connection portion 922 . The conductive member 930 has a configuration in which a plate member extends from the connection portion 931 to the attachment portion 933 and an electric wire extends from the attachment portion 933 to the connection portion 932 .

[1.4 Description of Other Components]
The control unit 20 is a device having a control device (not shown) that controls the storage elements 400 in the storage unit 10 , specifically a BMS (Battery Management System) that controls the storage elements 400 . The control device arranged in the control unit 20 is a device that is connected to the main current path of the storage element 400 and controls the storage element 400. For example, a circuit board, a fuse, They are relays, semiconductor switches such as FETs (Field Effect Transistors), shunt resistors, and the like. The control unit 20 is housed in the exterior body 100 .

External terminals 21 are arranged at the ends of the exterior body 100 in the positive direction of the X axis and the negative direction of the Y axis, and external terminals 22 are arranged at the ends in the positive direction of the X axis and the positive direction of the Y axis. That is, the external terminal 22 is arranged at one end (the end in the positive X-axis direction) of the power storage device 1 in the longitudinal direction (X-axis direction). The external terminal 21 is one module terminal (general terminal) on the positive electrode side and the negative electrode side, which is electrically connected to the power storage element 400 of the power storage unit 10 . The external terminal 22 is a member that can be the other module terminal (general terminal) on the positive electrode side and the negative electrode side, and is configured to be electrically connectable to the storage element 400 . The external terminals 21 and 22 are electrically connected to the connection portions 911 and 931, respectively.

The power storage device 1 charges electricity from the outside and discharges electricity to the outside through the external terminals 21 and 41 or the external terminals 21 and 22 . For example, the external terminal 21 is a positive external terminal that is a positive external terminal, and the external terminal 41 or 22 is a negative external terminal that is a negative external terminal. The external terminals 21 and 22 are made of a conductive member made of metal such as aluminum, aluminum alloy, copper, copper alloy, or the like.

[2 Description of Configuration of Storage Element 400]
Next, the configuration of power storage element 400 will be described in further detail. Note that the eight power storage elements 400 (two first power storage elements 401, two second power storage elements 402, two third power storage elements 403, and two fourth power storage elements 404) provided in the power storage unit 10 are Since they all have the same configuration, the configuration of one power storage element 400 will be described below.

FIG. 4 is an exploded perspective view showing each component by disassembling the power storage device 400 according to the present embodiment. Specifically, FIG. 4 shows an exploded view of each part in a state in which the power storage element 400 shown in FIG. 3 is placed vertically (upright).

As shown in FIG. 4 , the storage element 400 includes a container 410 , a pair of electrode terminals 420 (positive electrode side and negative electrode side), and a pair of gaskets 430 (positive electrode side and negative electrode side). A pair of gaskets 440 (on the positive electrode side and the negative electrode side), a pair of current collectors 450 (on the positive electrode side and the negative electrode side), and an electrode assembly 460 are housed inside the container 410 . An electrolytic solution (non-aqueous electrolyte) is sealed inside the container 410, but the illustration is omitted. As the electrolytic solution, the type is not particularly limited as long as it does not impair the performance of the electric storage element 400, and various kinds can be selected. In addition to the components described above, a spacer disposed on the side or below the electrode body 460, an insulating film that wraps the electrode body 460 or the like, an insulating sheet that covers the outer surface of the container 410, or the like may be disposed.

The container 410 is a rectangular parallelepiped (square or box-shaped) case having a container body 411 with an opening and a container lid 412 closing the opening of the container body 411 . With such a configuration, the container 410 has a structure in which the inside can be hermetically sealed by, for example, welding the container body 411 and the container lid 412 after housing the electrode body 460 and the like inside the container body 411 . It's becoming The material of the container main body 411 and the container lid 412 is not particularly limited, but weldable metals such as stainless steel, aluminum, aluminum alloy, iron, and plated steel plate are preferable.

The container main body 411 is a rectangular tubular member that constitutes the main body of the container 410 and has a bottom, and an opening is formed on the Y-axis negative direction side. That is, the container body 411 has a pair of rectangular and planar (flat) long side surfaces 411a on both side surfaces in the Z-axis direction, and a pair of rectangular and planar (flat) side surfaces on both side surfaces in the X-axis direction. b) It has a short side surface 411b and a rectangular and planar (flat) bottom surface 411c on the Y-axis plus direction side. The container lid 412 is a rectangular plate-like member that constitutes the lid of the container 410 , and is arranged on the Y-axis negative direction side of the container body 411 so as to extend in the X-axis direction. The container cover 412 has a gas discharge valve 412a that releases the pressure inside the container 410 when the pressure rises, and an injection part (not shown) for injecting the electrolytic solution into the container 410. ) etc. are provided. Thus, the container 410 has a container body 411 and a container lid 412 that are arranged side by side in the Y-axis direction (second direction) and joined together. Further, as described above, the first storage element 401 to the fourth storage element 404 are arranged side by side in the X-axis direction (third direction), which is the longitudinal direction of the container lid 412 .

The electrode body 460 is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate is formed by forming a positive electrode active material layer on a positive electrode substrate layer, which is a collector foil made of a metal such as aluminum or an aluminum alloy. The negative electrode plate is formed by forming a negative electrode active material layer on a negative electrode substrate layer, which is a 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 appropriately used as long as it can intercalate and deintercalate lithium ions. In the present embodiment, electrode body 460 is formed by winding electrode plates (positive electrode plate and negative electrode plate) around a winding axis (virtual axis parallel to the X-axis direction) extending in the X-axis direction. It is a type (so-called vertically wound type) electrode body.

Here, since the electrode plates (positive electrode plate and negative electrode plate) of the electrode assembly 460 are stacked in the Z-axis direction, the Z-axis direction is also called the stacking direction. That is, the electrode body 460 is formed by stacking electrode plates in the stacking direction. The electrode body 460 has a pair of flat portions 461 aligned in the Z-axis direction and a pair of curved portions 462 aligned in the Y-axis direction by winding the electrode plate. The stacking direction is the stacking direction of the electrode plates in the flat portion 461 . The flat portion 461 is a flat portion that connects the ends of a pair of curved portions 462, and the curved portion 462 is a portion curved in a semicircular shape or the like so as to protrude in the Y-axis direction. The direction in which the flat surface of the flat portion 461 faces or the facing direction of the pair of flat portions 461 can also be defined as the stacking direction. Therefore, it can be said that the plurality of first power storage elements 401 are arranged in the stacking direction. The same applies to other storage elements 400 . The X-axis direction in which the first storage element 401 to the fourth storage element 404 are arranged is also called the arrangement direction. That is, the first storage element 401 to the fourth storage element 404 are arranged in the arrangement direction crossing the stacking direction.

In addition, since the electrode body 460 is wound with the positive electrode plate and the negative electrode plate shifted in the X-axis direction, the active material is formed at the ends of the positive electrode plate and the negative electrode plate in the shifted direction. It has a part (active material layer non-formation part) where the base material layer is exposed without being (coated). That is, the electrode body 460 protrudes from the flat portion 461 and the curved portion 462 to both sides in the X-axis direction at both ends in the X-axis direction, and the active material layer non-formed portions of the positive electrode plate and the negative electrode plate are laminated to collect current. It has an end 463 that connects with the body 450 .

Note that the electrode body 460 is a so-called horizontally wound electrode body formed by winding electrode plates around a winding axis extending in the Y-axis direction, or a laminated body formed by laminating a plurality of flat plate-shaped electrode plates. The electrode body may be of any form, such as a stacked (stacked) electrode body or a bellows-shaped electrode body in which electrode plates are folded into a bellows shape. In the case of the horizontally wound electrode body, the flat portion is the flat portion other than the curved portion and the connection portion (tab) with the current collector. A flat portion is a flat portion other than the connection portion (tab) with the current collector.

The electrode terminal 420 is a terminal (a positive electrode terminal and a negative electrode terminal) of the power storage element 400, and is arranged on the container lid 412 so as to protrude in the Y-axis negative direction. The electrode terminal 420 is electrically connected to the positive plate and the negative plate of the electrode body 460 via the current collector 450 . The electrode terminal 420 is made of a conductive member such as metal such as aluminum, aluminum alloy, copper, copper alloy, or the like.

The current collector 450 is a conductive member (a positive electrode current collector and a negative electrode current collector) electrically connected to the electrode terminal 420 and the end portion 463 of the electrode body 460 . The current collector 450 is made of aluminum, an aluminum alloy, copper, a copper alloy, or the like. The gaskets 430 and 440 are plate-shaped electrically insulating sealing members arranged between the container cover 412 and the electrode terminal 420 and current collector 450 . The gaskets 430 and 440 are made of, for example, any electrically insulating resin material that can be used for the second exterior body 120 .

[3 Description of Connection Member 40 and its Peripheral Configuration]
Next, the configuration of the connection member 40 and its surroundings will be described in more detail. FIG. 5 is a perspective view showing the configuration of the connection member 40 and its surroundings according to the present embodiment. Specifically, (a) of FIG. 5 shows an enlarged view of the configuration around the opening 122 of the connecting member 40a and the second exterior body 120 shown in FIG. 2, and (b) of FIG. (a) shows the configuration of the external terminal 41 of the connection member 40a. (c) and (d) of FIG. 5 show the configuration when (a) and (b) of FIG. 5 are rotated by 180° around the Z-axis (as seen from the opposite side).

FIG. 6 is a perspective view showing the positional relationship among the first exterior body 110, the conductive member 900, and the external terminals 41 of the connection member 40a according to the present embodiment. Specifically, in FIG. 6, the first exterior body 110 and the conductive members 910 to 930 shown in FIG. 4 is a perspective view showing a configuration to which an external terminal 41 is added. FIG. FIG. 7 is a perspective view showing the positional relationship among mounting base 117 of first exterior body 110, conductive members 920 and 930, and external terminal 41 (and connecting portion 43) according to the present embodiment. Specifically, FIG. 7(a) shows an enlarged view of the mount 117, the conductive members 920 and 930, and the external terminal 41 shown in FIG. 6, and FIG. 7(b) shows FIG. The structure of the connecting portion 43 of the connecting member 40b is shown.

FIG. 8 is a perspective view showing a configuration in which power storage device 1 according to the present embodiment includes connection member 40b. Specifically, (a) of FIG. 8 shows a configuration in which the connection member 40a is changed to the connection member 40b in the power storage device 1 shown in FIG. 1, and (b) of FIG. configuration.

In the following description, the external terminal 41 of the connection member 40a is also referred to as the first external terminal 41, and the cover member 42 is also referred to as the first cover member 42. As shown in FIG. The external terminal 22 is also called the second external terminal 22 . Conductive member 920 is also referred to as first conductive member 920 and conductive member 930 is also referred to as second conductive member 930 . The connection portion 921 is also called the first conductive member connection portion 921 , and the connection portion 932 is also called the second conductive member connection portion 932 .

As shown in FIG. 5, the first external terminal 41 of the connection member 40a has a first external terminal main body 41a and a first external terminal connecting portion 41b. The first external terminal main body 41a is a part that constitutes the main body of the first external terminal 41, and is connected to an external conductive member (not shown). The first external terminal main body 41a has a shape in which a columnar portion protrudes in the positive direction of the Z-axis from a center portion of a plate-like portion parallel to the XY plane. The first external terminal connection portion 41b is a plate-like portion parallel to the XZ plane and extending in the negative Z-axis direction from the end (edge) of the first external terminal main body 41a in the negative Y-axis direction. The first external terminal connection portion 41b is electrically connected to the first conductive member 920 by being attached to the mounting base 117, as shown in FIG. 6 and the like.

The first cover member 42 of the connecting member 40a has a shape in which the corners of the negative X-axis direction and the positive Y-axis direction are recessed in the negative Z-axis direction. A first external terminal main body 41a is arranged. In addition, the first cover member 42 has two first cover member mounting portions 42a projecting in the negative Z-axis direction at the negative end of the X-axis and the positive end of the Y-axis. The first cover member attachment portion 42 a is a portion attached to a second exterior body attachment portion 122 a provided inside the opening 122 of the second exterior body 120 .

By attaching the first cover member attachment portion 42a to the second exterior body attachment portion 122a, the first cover member 42 is attached to the second exterior body 120 and closes the opening 122 of the second exterior body 120. . Thus, it can be said that the first cover member 42 constitutes a part of the second exterior body 120 (a part of the exterior body 100). Also, when the first cover member 42 is attached to the second exterior body 120 , the first external terminal connection portion 41 b of the first external terminal 41 is attached to the mounting base 117 and electrically connected to the first conductive member 920 . Connected.

Specifically, as shown in (a) of FIG. 7, the first conductive member connecting portion 921 of the first conductive member 920 can be It is attached to the first attachment portion 117a. The first external terminal connection portion 41b is attached to the second attachment portion 117b by being inserted into a gap provided in the second attachment portion 117b of the attachment base 117 . In the present embodiment, the first attachment portion 117a and the second attachment portion 117b are made of a conductive member made of metal such as aluminum, aluminum alloy, copper, or copper alloy, and are integrally formed. Thereby, the first external terminal connection portion 41 b is electrically connected to the first conductive member connection portion 921 . The first conductive member connecting portion 921 may be attached to the first attaching portion 117a by welding or the like, and the method of attaching the first external terminal connecting portion 41b to the second attaching portion 117b is not particularly limited.

Also, the second conductive member connecting portion 932 of the second conductive member 930 is attached to the third mounting portion 117c of the mounting base 117 by a bolt portion and a nut provided on the third mounting portion 117c. The second conductive member connection portion 932 may be attached to the third attachment portion 117c by welding or the like. Further, the mounting base 117 is provided with a fourth mounting portion 117d having a shape obtained by rotating the second mounting portion 117b by 90° around the Z-axis. The third mounting portion 117c and the fourth mounting portion 117d, like the first mounting portion 117a and the second mounting portion 117b, are made of a conductive member made of metal such as aluminum, aluminum alloy, copper, copper alloy, etc. and integrally formed.

The mounting base 117 is formed of an insulating member such as resin at portions other than the first mounting portion 117a, the second mounting portion 117b, the third mounting portion 117c, and the fourth mounting portion 117d. Therefore, the first mounting portion 117a and the second mounting portion 117b are insulated from the third mounting portion 117c and the fourth mounting portion 117d. Therefore, when the first external terminal connection portion 41b is attached to the second attachment portion 117b (the first cover member 42 is attached to the second exterior body 120), the first external terminal connection portion 41b is attached to the second attachment portion 117b. It is not electrically connected to the two conductive member connecting portion 932 . In other words, when the external terminal 41 is attached to the mount 117, the first conductive member 920 and the second conductive member 930 are not electrically connected.

On the other hand, as shown in (b) of FIG. 7, when the connection portion 43 is attached to the mounting base 117 instead of the external terminal 41, the first conductive member 920 and the second conductive member 930 are electrically connected. . Similarly to the external terminal 41, the connecting portion 43 is made of a conductive member made of metal such as aluminum, aluminum alloy, copper, or copper alloy, and is shaped like a sheet of plate-like member that is bent. have.

Specifically, the connecting portion 43 has a first conductive side connecting portion 43a and a second conductive side connecting portion 43b. Like the first external terminal connection portion 41b, the first conductive side connection portion 43a is a plate-like portion extending in the Z-axis direction and parallel to the XZ plane. It is attached to the second attachment portion 117b by being inserted into the provided gap. The second conductive-side connecting portion 43b protrudes in the positive Y-axis direction from the end (edge) of the first conductive-side connecting portion 43a in the positive X-axis direction, and is parallel to the YZ plane extending in the Z-axis direction. It is a flat plate-shaped part. The second conductive-side connection portion 43b is attached to the fourth attachment portion 117d by being inserted into a gap provided in the fourth attachment portion 117d of the attachment base 117 .

As a result, the connecting portion 43 electrically connects the second mounting portion 117b and the fourth mounting portion 117d, and conducts the first conductive member 920 and the second conductive member 930. As shown in FIG. That is, the connecting portion 43 is an adapter that electrically connects the first conductive member 920 and the second conductive member 930 . The method of attaching the first conductive side connection portion 43a to the second attachment portion 117b and the method of attaching the second conductive side connection portion 43b to the fourth attachment portion 117d are not particularly limited.

Here, as shown in FIG. 8, the connecting portion 43 is a member provided on the connecting member 40b. That is, the connection member 40b has a connection portion 43 and a second cover member 44. As shown in FIG. The second cover member 44, like the first cover member 42 of the connecting member 40a, is a member that is formed in a shape corresponding to the opening 122 of the second exterior body 120 and closes the opening 122. It is formed of an insulating member or the like similar to the member 42 . Like the first cover member 42, the second cover member 44 is provided with an attachment portion (not shown) that is attached to the second exterior body attachment portion 122a. The connecting portion 43 is attached to the second cover member 44 by insert molding or the like, and when the second cover member 44 closes the opening 122, the connecting portion 43 is arranged inside the second exterior body 120. be done. That is, when the second cover member 44 is attached to the second exterior body 120 , the connecting portion 43 electrically connects the first conductive member 920 and the second conductive member 930 .

As described above, when the connection member 40a is attached to the second exterior body 120, the first external terminal 41 is connected to the first conductive member 920 without being connected to the second conductive member 930. . When the connecting member 40 b is attached to the second exterior body 120 , the connecting portion 43 electrically connects the first conductive member 920 and the second conductive member 930 .

In other words, the connection member 40 electrically connects the first external terminal 41 that is connected to the first conductive member 920 and is not connected to the second conductive member 930, and the first conductive member 920 and the second conductive member 930. It has either one of the connection portions 43 that allow the connection to be made. That is, the first conductive member 920 is configured to be connectable to the first external terminal 41, and the second conductive member 930 is electrically connectable to the first conductive member 920 and has the same polarity as the first external terminal 41. is configured to be connectable with the second external terminal 22 of

[4 Explanation of effects]
As described above, the power storage device 1 according to the embodiment of the present invention includes the first conductive member 920 connectable to the first external terminal 41 and the first conductive member 920 connectable to the first conductive member 920 and the second external terminal 22 . a second conductive member 930; Furthermore, the power storage device 1 includes a connection member 40 having either one of a first external terminal 41 and a connection portion 43 that connects the first conductive member 920 and the second conductive member 930 . The second external terminal 22 is arranged at one end in the longitudinal direction of the power storage device 1 (the end in the positive direction of the X-axis), and the connection member 40 is arranged at the other end in the longitudinal direction of the power storage device 1 (the end in the negative direction of the X-axis). end). Accordingly, when the connection member 40 has the first external terminal 41 (the power storage device 1 has the connection member 40a), the first external terminal 41 is connected to the first conductive member 920, so that the first conductive member A first external terminal 41 connected to 920 serves as an external terminal of the power storage device 1 . When the connection member 40 has the connection portion 43 (the power storage device 1 includes the connection member 40b), the first conductive member 920 and the second conductive member 930 to which the second external terminal 22 is connected are connected. Therefore, the second external terminal 22 connected to the second conductive member 930 becomes the external terminal of the power storage device 1 . That is, when the connection member 40 has the first external terminal 41, the first external terminal 41 as an external terminal is located at the connection position (the other end in the longitudinal direction of the power storage device 1) with the first conductive member 920. will be placed. When the connection member 40 has the connection portion 43, the second external terminal 22 as an external terminal is arranged at the connection position (one end in the longitudinal direction of the power storage device 1) with the second conductive member 930. Become. In this way, since the external terminal can be changed to the first external terminal 41 or the second external terminal 22, the position of the external terminal is changed (switched between one end and the other end in the longitudinal direction of the power storage device 1). possible).

In addition, the connection member 40 can be attached and detached from the outside of the exterior body 100 by arranging the connection member 40 so as to pass through the exterior body 100 . Thus, the external terminal can be easily changed to the first external terminal 41 or the second external terminal 22 by attaching/detaching the first external terminal 41 or attaching/detaching the connection portion 43 from the outside of the exterior body 100. Therefore, the positions of the external terminals can be easily changed.

Further, when the power storage device 1 includes the connection member 40b, the connection member 40b has the connection portion 43, and the second external terminal 22 is connected to the second conductive member 930, so that the first external terminal is used as the external terminal. A second external terminal 22 is used instead of 41 . That is, the position of the external terminal is not the position where it is connected to the first conductive member 920 (the position of the connection member 40), but the position where it is connected to the second conductive member 930 (one end in the longitudinal direction of the power storage device 1). Be changed. Thus, the positions of the external terminals can be easily changed.

In addition, since the second external terminal 22 is configured to be detachable from the second conductive member 930, the shape of the second external terminal 22 can be easily changed, and maintenance or replacement of the second external terminal 22 can be easily performed. can be easily done.

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

For example, in the above-described embodiment, in the exterior body 100, the second exterior body 120 is a bottomed rectangular cylindrical member with an opening formed in the negative direction of the Z axis, and the first exterior body 110 is a second It is a flat rectangular member that closes the opening of the exterior body 120 . However, the first exterior body 110 is a bottomed rectangular cylindrical member with an opening formed in the positive direction of the Z axis, and the second exterior body 120 is a flat rectangular shape that closes the opening of the first exterior body 110 . It may be a shaped lid or any other shape.

In the above-described embodiment, the first exterior body 110 is arranged in the negative Z-axis direction of the power storage element 400, and the restraining body 600 is arranged in the positive Z-axis direction of the power storage element 400 and joined to each other. . However, the first exterior body 110 may be arranged in the positive Z-axis direction of the power storage element 400, and the restraining body 600 may be arranged in the negative Z-axis direction of the power storage element 400 and joined together. In other words, the power storage device 1 may have a configuration that is upside down.

In the above embodiment, first exterior body 110 is attached with restraining body 600 to restrain power storage element 400 . However, restraining body 600 may not be attached to first exterior body 110 , and restraining body 600 may be attached to another member to restrain power storage element 400 .

In the above embodiment, the connection member 40 is detachably attached to the exterior body 100 . However, the connection member 40 may be fixed to the exterior body 100 in a non-detachable (unremovable) manner.

In the above-described embodiment, the connection member 40 is arranged so as to pass through the second exterior body 120 of the exterior body 100 . However, the connection member 40 may be arranged in a state of penetrating the first exterior body 110 , or may be arranged inside the exterior body 100 without penetrating the exterior body 100 . Alternatively, power storage device 1 may include connecting member 40 without including exterior body 100 .

In the above embodiment, instead of providing the external terminal 21 or 22 in the power storage unit 10, the potential of the external terminal 21 or 22 (e.g., the negative potential) may be dropped to the exterior body 100 (e.g., the first exterior body 110). good. When the potential is dropped to the exterior body 100 (for example, the first exterior body 110) without providing the external terminal 22 (the second exterior terminal 22), the exterior body 100 (for example, the first exterior body 110) serves as the second external terminal. can be defined.

In the above-described embodiment, the connection portion 43 of the connection member 40b is a conductive member (adapter) that electrically connects the first conductive member 920 and the second conductive member 930 together. However, the first conductive member 920 and the second conductive member 930 are configured to be in direct contact, and the connection portion 43 presses the second conductive member 930 against the first conductive member 920, for example, to A member that directly contacts the member 920 and the second conductive member 930 may be used.

In the above-described embodiment, the positions of the external terminals of one of the polarities of the power storage device 1 are configured to be changeable, but the positions of the external terminals of both polarities of the power storage device 1 are configured to be changeable. It is permissible to assume that

The power storage device 1 does not have to include all the components described above. For example, power storage device 1 may not include first reinforcing member 200, second reinforcing member 300, spacer 500, restraint body 600, or the like.

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

The present invention can be realized not only as power storage device 1 , but also as a combination of first conductive member 920 , second conductive member 930 and connection member 40 .

INDUSTRIAL APPLICABILITY The present invention can be applied to a power storage device having a power storage element such as a lithium ion secondary battery.

1 power storage device 10 power storage unit 20 control unit 21 external terminal 22 external terminal (second external terminal)
43, 911, 912, 922, 931 connection part 800, 810, 820, 830 bus bar 40, 40a, 40b connection member 41 external terminal (first external terminal)
41a first external terminal main body 41b first external terminal connection portion 42 cover member (first cover member)
42a First cover member attachment portion 43a First conductive side connection portion 43b Second conductive side connection portion 44 Second cover member 100 Exterior body 110 First exterior body 113, 114, 115, 117 Mounting base 117a First mounting portion 117b Second attachment portion 117c Third attachment portion 117d Fourth attachment portion 120 Second exterior body 122 Opening 122a Second exterior body attachment portion 130 Fixing member 200 First reinforcing member 300 Second reinforcing member 400 Storage element 410 Container 420 Electrode terminal 500 Spacer 600 Restraint 900, 910 Conductive member 913, 933 Mounting portion 920 Conductive member (first conductive member)
921 connection part (first conductive member connection part)
930 conductive member (second conductive member)
932 connection part (second conductive member connection part)

Claims (4)

A power storage device comprising a power storage element,
a first conductive member arranged on the main current path of the storage element and connectable to a first external terminal;
A second external terminal that is electrically connectable to the first conductive member and has the same polarity as the first external terminal and is arranged at one end in the longitudinal direction of the power storage device. a two-conducting member;
said first external terminal connected to said first conductive member and not connected to said second conductive member; a connection member having either one of connection portions for electrically connecting the member and the second conductive member;
A power storage device. Further comprising an exterior body in which the power storage element is housed,
The power storage device according to claim 1 , wherein the connection member is arranged in a state of penetrating the exterior body. The connecting member has the connecting portion,
The power storage device according to claim 1 or 2, wherein the power storage device includes the second external terminal connected to the second conductive member at the one end portion in the longitudinal direction of the power storage device. The power storage device according to claim 3, wherein the second external terminal is detachably connected to the second conductive member.

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