JP2024045878A - Power storage device - Google Patents

Abstract

[Problem] To provide an electric storage device having a structure that allows a restraint to be positioned relative to a housing without relying on an adhesive. [Solution] An electric storage device (1) includes a cell (10), a restraint (20), and a housing (30). The restraint (20) restrains the cell (10). The housing (30) houses the cell (10) and the restraint (20). One of the restraint (20) and the housing (30) has a protrusion (251) that protrudes toward the other. The other of the restraint (20) and the housing (30) has a groove (313). The protrusion (251) is inserted into the groove (313). [Selected Figure] Figure 2

Description

The present invention relates to a power storage device that includes a cell, a restraining body that restrains the cell, and a housing that accommodates the cell and the restraining body.

Conventionally, there is known an electric storage device used as a battery for an automobile or the like. The electric storage device includes a plurality of cells capable of charging and discharging electricity, a restraining body that restrains the plurality of cells, and a housing that contains the plurality of cells and the restraining body. A conventional electric storage device is described, for example, in Patent Document 1.

JP 2020-155228 A

In this type of energy storage device, the restraining body needs to be positioned relative to the housing. In conventional energy storage devices, the restraining body is positioned relative to the housing by fixing it with an adhesive. However, when an adhesive is used, it is necessary to carry out a surface modification process on the housing or the restraining body to improve adhesion. In addition, when an adhesive is used, it takes longer to manufacture the energy storage device because of the application and hardening of the adhesive.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power storage device having a structure in which a restraining body can be positioned with respect to a housing without depending on an adhesive.

A power storage device according to an embodiment of the present invention is a power storage device including a cell, a restraint body that restrains the cell, and a housing that accommodates the cell and the restraint body, the power storage device including the restraint body and the restraint body. Either one of the housings has a protrusion that protrudes toward the other, and the other of the restraint body and the housing has a groove into which the protrusion is inserted.

According to the power storage device according to an embodiment of the present invention, by inserting the protrusion into the groove, the restraining body can be positioned with respect to the housing without relying on adhesive.

FIG. 2 is a perspective view of a power storage device. FIG. It is a perspective view of a cell. A view of multiple cells and constraints in the z direction. FIG. 3 is a diagram of the power storage device viewed in the z direction with the lid removed. FIG. 7 is a partial cross-sectional view of a restraint body and a housing according to a first modification. FIG. 11 is a partial cross-sectional view of a restraint body and a housing according to a second modified example. FIG. 11 is a partial cross-sectional view of a restraint body and a housing according to a third modified example. FIG. 13 is a partial cross-sectional view of a restraint body and a housing according to a fifth modified example. FIG. 13 is a partial cross-sectional view of a restraint body and a housing according to a seventh modified example.

1. Overview of the embodiment
(1) An energy storage device according to one embodiment of the present invention is an energy storage device comprising a cell, a restraint body that restrains the cell, and a housing that accommodates the cell and the restraint body, wherein one of the restraint body or the housing has a protrusion that protrudes toward the other, and the other of the restraint body or the housing has a groove into which the protrusion is inserted.

According to the power storage device described in (1) above, by inserting the protrusion into the groove, the restraining body can be positioned with respect to the housing without relying on adhesive.

(2) In the energy storage device described in (1) above, the protrusion may be an elastic body having elasticity in a direction in which the outer surface of the restraint body and the inner surface of the housing face each other.

According to the power storage device described in (2) above, it is possible to suppress vibrations from being transmitted from the housing to the restraint body. This protects the cell from vibrations.

(3) In the energy storage device described in (2) above, the protrusion may be a leaf spring.

According to the power storage device described in (3) above, manufacturing is easier than other types of elastic bodies, and design regarding elastic force is also easier.

(4) In the power storage device according to any one of (1) to (3) above, the protrusion is located on the outer surface of the restraint body, and the groove is located on the inner surface of the housing. You can.

According to the energy storage device described in (4) above, by providing a groove in the housing, it is easier to form the groove than if the groove were provided in the restraint.

(5) In the energy storage device described in (4) above, the housing may have a first inner surface and a second inner surface that face each other, the restraint body may have a first outer surface that faces the first inner surface and a second outer surface that faces the second inner surface, the protrusions may be located on the first outer surface and the second outer surface, and the grooves may be located on the first inner surface and the second inner surface.

According to the power storage device described in (5) above, positioning of the restraint member in one direction with respect to the housing is performed by the pair of protrusions. Thereby, the restraining body can be accurately positioned with respect to the housing.

(6) In the power storage device according to any one of (1) to (5) above, the housing includes a bottom plate portion and a side wall portion extending from the bottom plate portion, and the protrusion portion includes: An end portion of the side wall portion opposite to the bottom plate portion may be inserted into the groove portion.

According to the power storage device described in (6) above, the groove and the protrusion are provided near the opening of the housing. Thereby, the restraining body can be positioned with more precision with respect to the housing.

＜2. Specific implementation examples＞

Below, more specific embodiments of the present invention will be described with reference to the drawings.

Note that in each figure of the present application, the x direction, y direction, and z direction are indicated by arrows. The x direction is the direction in which the plurality of cells 10 are arranged. The y direction is the direction in which the positive terminal 111 and negative terminal 112 of the cell 10 are lined up. The z direction is a direction in which the bottom plate portion 311 of the housing 30 and the opening portion 310 are lined up. The x direction, y direction, and z direction are orthogonal to each other.

Power storage device 1 is installed, for example, in a posture in which the x and y directions are horizontal and the z direction is vertical. However, the installation posture of power storage device 1 does not necessarily have to be as described above.

<2-1. Configuration of power storage device>
FIG. 1 is a perspective view of a power storage device 1 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of power storage device 1.

This storage battery 1 is a device that stores (charges) electricity and supplies (discharges) the stored electricity to an external circuit as needed. The storage battery 1 is mounted, for example, on transportation equipment such as automobiles, motorcycles, ships, and trains, and is used as a battery for a drive motor or a battery for starting an engine. However, the storage battery 1 may also be mounted on a stationary device such as a generator.

As shown in FIG. 2, power storage device 1 includes a plurality of cells 10, a restraining body 20, and a housing 30.

Cell 10 is an energy storage element capable of charging and discharging electricity. Cell 10 is, for example, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. FIG. 3 is a perspective view of cell 10. As shown in FIG. 3, cell 10 has a case 11 that is a substantially rectangular parallelepiped that is flattened in the x direction. The thickness of case 11 in the x direction is smaller than the length of cell 10 in the y direction and z direction. An electrode body, a positive electrode collector, a negative electrode collector, and an electrolyte are contained inside case 11.

The case 11 also has a positive electrode terminal 111 and a negative electrode terminal 112 on the end surface in the z direction. The positive electrode terminal 111 is electrically connected to the positive electrode collector inside the case 11. The negative electrode terminal 112 is electrically connected to the negative electrode collector inside the case 11. The positive electrode terminal 111 and the negative electrode terminal 112 are arranged with a gap in the y direction.

The plurality of cells 10 are arranged in a row in the x direction with the ends in the y direction and the ends in the z direction aligned. In this embodiment, four cells 10 are arranged adjacent to each other in the x direction. However, the number of cells 10 that power storage device 1 has may be two, three, or five or more. Further, a spacer made of an insulator may be interposed between adjacent cells 10.

The restraint body 20 is a part for restraining the multiple cells 10. The restraint body 20 is formed of a metal such as iron or aluminum. Figure 4 is a view of the multiple cells 10 and the restraint body 20 viewed in the z direction. As shown in Figures 2 and 4, the restraint body 20 has a first end portion 21, a second end portion 22, a first side portion 23, and a second side portion 24.

The first end portion 21 and the second end portion 22 are located at both ends of the multiple cells 10 in the arrangement direction (x direction). The multiple cells 10 are sandwiched between the first end portion 21 and the second end portion 22. The first side portion 23 connects one end of the first end portion 21 in the y direction to one end of the second end portion 22 in the y direction in the x direction. The second side portion 24 connects the other end of the first end portion 21 in the y direction to the other end of the second end portion 22 in the y direction in the x direction.

That is, the restraint body 20 is formed into a substantially rectangular ring shape by the first end portion 21, the second end portion 22, the first side portion 23, and the second side portion 24. A plurality of cells 10 are inserted inside this rectangular annular restraint body 20. Thereby, the plurality of cells 10 are mutually restrained. Further, by restraining the plurality of cells 10, the restraining body 20 also plays a role of suppressing expansion of the cells 10 due to long-term use.

The first end portion 21, the second end portion 22, the first side portion 23, and the second side portion 24 may be separate members from each other. In that case, the first end portion 21, the second end portion 22, the first side portion 23, and the second side portion 24 may be fixed to each other by welding or the like. Further, the restraint body 20 may be formed by bending a single metal plate into a rectangular ring shape and welding both ends of the metal plate.

The housing 30 is a housing that houses multiple cells 10 and the restraining body 20. As shown in Figures 1 and 2, the housing 30 has a cylindrical housing body 31 with a bottom and a lid body 32.

The housing body 31 and the lid body 32 are formed by injection molding of resin, which is an insulator. Specifically, the housing body 31 and the lid body 32 are made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE) )), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyethersulfone ( PES), ABS resin, or a composite material thereof. However, the housing main body 31 and the lid body 32 may be formed of metal.

The housing body 31 has a bottom plate portion 311 and four side wall portions 312. The bottom plate portion 311 extends along the xy plane. When viewed in the z direction, the shape of the bottom plate portion 311 is rectangular. The four side wall portions 312 each extend in the z direction from an edge portion corresponding to the four sides of the rectangular bottom plate portion 311. Thus, the housing body 31 has the bottom plate portion 311 at one end in the z direction and an opening portion 310 at the other end in the z direction. The restraint body 20 holding the multiple cells 10 is accommodated inside the housing body 31 through the opening portion 310.

The lid 32 is a plate-shaped component that extends along the xy plane. The lid 32 is fixed to the ends of the four side walls 312 on the opening 310 side. This causes the opening 310 of the housing body 31 to be closed by the lid 32.

As shown in FIGS. 1 and 2, the lid 32 has a positive external terminal 321 and a negative external terminal 322. Further, a positive bus bar and a negative bus bar (not shown) are arranged between the plurality of cells 10 and the lid 32. The positive external terminal 321 is electrically connected to the positive terminal 111 of the cell 10 at one end in the x direction via a positive bus bar. The negative external terminal 322 is electrically connected to the negative terminal 112 of the cell 10 at the other end in the x direction via the negative bus bar. Moreover, the cells 10 adjacent in the x direction are connected in series by electrically connecting the positive electrode terminal 111 and the negative electrode terminal 112.

When the energy storage device 1 is in use, the positive electrode external terminal 321 and the negative electrode external terminal 322 are connected to an external electrical circuit.

<2-2. Positioning of the restraint body relative to the housing>
Next, the positioning of the restraining body 20 relative to the housing 30 will be described.

Figure 5 is a view of the energy storage device 1 viewed in the z direction with the lid 32 removed. As shown in Figures 2, 4, and 5, the restraint 20 has four fixing members 25. The four fixing members 25 are fixed to the first end portion 21, the second end portion 22, the first side portion 23, and the second side portion 24 of the restraint 20, respectively. The fixing members 25 are formed by pressing a metal plate. The four fixing members 25 are fixed to the outer surfaces of the first end portion 21, the second end portion 22, the first side portion 23, and the second side portion 24, for example, by welding.

As shown in Figures 2 and 4, the fixing member 25 has a base portion 251 and a protrusion portion 252. The base portion 251 is flat and is fixed to the outer surface of the restraint body 20. The protrusion portion 252 protrudes from the base portion 251 toward the outside of the restraint body 20. In other words, when the restraint body 20 is housed in the housing main body 31, the protrusion portion 252 protrudes from the outer surface of the restraint body 20 toward the inner surface of the housing 30.

The protrusion 252 in this embodiment is formed by punching out a strip-shaped region in the center of the base portion 251 using a press process, leaving one end. The protrusion 252 extends obliquely relative to the base portion 251 from one end connected to the base portion 251 toward the other end, which is the free end. In other words, the protrusion 252 in this embodiment protrudes in a thin plate shape in a direction inclined relative to the outer surface of the restraining body 20.

For this reason, the protrusion 252 in this embodiment is a leaf spring that is elastically deformable in the direction in which the outer surface of the restraint 20 and the inner surface of the housing 30 face each other. When an external force is applied from outside the restraint 20, the protrusion 252 bends in a direction approaching the outer surface of the restraint 20.

On the other hand, as shown in Figures 2 and 5, the housing 30 has four grooves 313. The four grooves 313 are provided on the inner surfaces of the four side walls 312 of the housing main body 31. The grooves 313 are rectangular recesses that are recessed outward from the inner surface of each side wall 312. The grooves 313 provided on a pair of side walls 312 facing each other in the x direction are located at the center of the side walls 312 in the y direction. The grooves 313 provided on a pair of side walls 312 facing each other in the y direction are located at the center of the side walls 312 in the x direction.

When the restraint 20 is housed in the housing body 31, the protrusions 252 of the fixing member 25 are inserted into the four grooves 313 of the housing body 31. In this embodiment, one protrusion 252 is inserted into one groove 313. At least a portion of the protrusion 252 contacts the inner surface of the groove 313. This positions the restraint 20 relative to the housing body 31.

That is, in this energy storage device 1, the restraining body 20 is positioned relative to the housing body 31 by inserting the protrusion 252 on the restraining body 20 into the groove 313 on the inner surface of the housing body 31. In this way, the restraining body 20 can be positioned relative to the housing body 31 without relying on adhesive. If the adhesive is omitted, there is no need to perform a surface modification process on the housing body 31 or the restraining body 20 to improve adhesion. In addition, the time and cost required for applying and curing the adhesive can be reduced. Therefore, the manufacturing cost of the energy storage device 1 can be reduced.

The following provides a more detailed explanation of the positioning of the restraint body 20 in the x direction relative to the housing body 31.

The four side walls 312 of the housing body 31 include a pair of side walls 312 spaced apart in the x direction. The inner surfaces of the pair of side walls 312 face each other in the x direction. The housing body 31 has grooves 313 on the inner surfaces (first inner surface and second inner surface) of the pair of side walls 312 that face each other in the x direction.

On the other hand, the restraint 20 has a first end portion 21 and a second end portion 22 that are spaced apart in the x direction. The outer surface of the first end portion 21 faces in the x direction the inner surface of one of the pair of side wall portions 312 that face each other in the x direction. The outer surface of the second end portion 22 faces in the x direction the inner surface of the other of the pair of side wall portions 312 that face each other in the x direction. The restraint 20 has protrusions 252 on the outer surfaces of the first end portion 21 and the second end portion 22 (first outer surface and second outer surface), respectively.

These pair of protrusions 252 are respectively inserted into the grooves 313 of the housing body 31. Then, each protrusion 252 contacts the inner surface of the groove 313 in the x direction. In this way, the protrusion 252 and the groove 313 come into contact with each other in the x direction at both ends of the restraint body 20 in the x direction, so that the restraint body 20 is positioned in the x direction with respect to the housing body 31.

Next, positioning of the restraint body 20 in the y direction with respect to the housing body 31 will be described in more detail.

The four side wall portions 312 of the housing body 31 include a pair of side wall portions 312 spaced apart from each other in the y direction. The inner surfaces of the pair of side wall portions 312 face each other in the y direction. The housing main body 31 has grooves 313 on the inner surfaces (first inner surface and second inner surface) of the pair of side wall sections 312 facing each other in the y direction.

On the other hand, the restraint 20 has a first side portion 23 and a second side portion 24 that are spaced apart in the y direction. The outer surface of the first side portion 23 faces in the y direction with the inner surface of one of the pair of side wall portions 312 that face in the y direction. The outer surface of the second side portion 24 faces in the y direction with the inner surface of the other of the pair of side wall portions 312 that face in the y direction. The restraint 20 has protrusions 252 on the outer surfaces of the first side portion 23 and the second side portion 24 (first outer surface and second outer surface), respectively.

These pair of protrusions 252 are respectively inserted into the grooves 313 of the housing body 31. Then, each protrusion 252 contacts the inner surface of the groove 313 in the y direction. In this way, the protrusion 252 and the groove 313 come into contact with each other in the y direction at both ends of the restraint body 20 in the y direction, so that the restraint body 20 is positioned in the y direction with respect to the housing body 31.

In particular, in this embodiment, the protrusion 252 is a leaf spring. Each protrusion 252 comes into contact with the inner surface of the groove 313 in a state bent more inward than in its natural state. In this way, the elastic repulsive force of the protrusion 252 allows the protrusion 252 to be maintained in contact with the groove 313 at all times. Further, by elastically deforming the protruding portion 252, dimensional errors in the housing body 31 or the restraining body 20 can be absorbed.

Further, when the housing main body 31 receives external vibrations or shocks, the vibrations or shocks are absorbed by the protrusion 252, which is an elastic body. Therefore, transmission of vibration or impact from the housing body 31 to the restraining body 20 can be suppressed. Thereby, the plurality of cells 10 can be protected from vibration or impact.

In particular, in this embodiment, protrusions 252 are provided on both ends of the restraint 20 in the x direction and both ends in the y direction. Therefore, even if vibration or impact is received from either the x direction or the y direction, the vibration or impact can be absorbed by the protrusions 252. This makes it possible to protect the multiple cells 10 from external forces in more directions.

As shown in FIG. 2, in this embodiment, the fixing member 25 is disposed at one of the two ends of the outer surface of the restraining body 20 in the z direction, which is the end farthest from the bottom plate portion 311 of the housing 30. Then, the protrusion 252 of the fixing member 25 is inserted into the groove portion 313 at the end of the side wall portion 312 of the housing 30 opposite the bottom plate portion 311. By inserting the protrusion 252 into the groove portion 313 in this manner near the opening portion 310 of the housing 30, the restraining body 20 can be positioned with greater precision relative to the housing 30. Specifically, the protrusion 252 is inserted into the groove portion 313 in the region between the midpoint of the side wall portion 312 in the height direction (z direction) and the opening portion 310.

In particular, when the housing body 31 is manufactured by injection molding, the inner dimension of the side wall portion 312 of the housing body 31 gradually increases toward the opening 310 for release from the mold. Such an inclination (so-called extraction taper) is provided. In this case, by inserting the protrusion 252 into the groove 313 near the opening 310 having the largest internal dimension, the restraining body 20 can be positioned with respect to the housing 30 with higher accuracy.

2, the groove 313 extends in the z direction on the inner surface of the side wall 312 from the end on the opening 310 side to near the bottom plate 311. However, the groove 313 may be formed only on the inner surface of the side wall 312 near the end on the opening 310 side. In this way, the area that is thinned by the groove 313 is reduced, and the strength of the housing 30 body can be increased. Specifically, the groove 313 may be formed in the area between the midpoint of the side wall 312 in the height direction (z direction) and the opening 310.

3. Modifications
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. Various modified examples will be described below, focusing on the differences from the above embodiment.

<3-1. First modification>
In the above embodiment, the protrusions 252 located at both ends of the restraint body 20 in the x direction were in contact with the inner surface of the groove 313 in the x direction. Further, in the above embodiment, the protrusions 252 located at both ends of the restraint body 20 in the y direction were in contact with the inner surface of the groove 313 in the y direction. However, as shown in FIG. 6, the protrusions 252 located at both ends of the restraint body 20 in the x direction may be in contact with the inner surface of the groove 313 in the y direction. Furthermore, the protrusions 252 located at both ends of the restraint body 20 in the y direction may be in contact with the inner surface of the groove 313 in the x direction.

In this case, the restraint body 20 is positioned in the y direction relative to the housing 30 by the protrusions 252 located at both ends of the restraint body 20 in the x direction. The restraint body 20 is also positioned in the x direction relative to the housing 30 by the protrusions 252 located at both ends of the restraint body 20 in the y direction. Therefore, even in this form, the restraint body 20 can be positioned in the x and y directions relative to the housing 30 by inserting the protrusions 252 into the grooves 313.

<3-2. Second modified example>
In the above embodiment, the fixing member 25 having the protrusion 252 is fixed to the outer surface of the restraint body 20. However, as shown in Fig. 7, the restraint body 20 itself may be formed with the protrusion 252 protruding outward. In this case, the protrusion 252 protruding outward may be formed by pressing a portion of the first end portion 21, the second end portion 22, the first side portion 23, and the second side portion 24 during the manufacture of the restraint body 20.

<3-3. Third modification>
In the above embodiment, the restraining body 20 was provided with the protrusion 252, and the housing 30 was provided with the groove 313 into which the protrusion 252 was inserted. However, as shown in FIG. 8, the housing 30 may be provided with the protrusion 252, and the restraint body 20 may be provided with a groove 313 into which the protrusion 252 is inserted.

That is, either the restraint body 20 or the housing 30 has a protrusion 252 that protrudes toward the other, and the other of the restraint body 20 or the housing 30 has a groove 313 into which the protrusion 252 is inserted. That's fine.

However, a plurality of cells 10 are arranged inside the restraint body 20. Furthermore, the restraining body 20 is often made of metal, whereas the housing 30 is often a resin molded product. For this reason, it is preferable to provide the groove portion 313 in the housing 30 as in the above embodiment, since the groove portion 313 can be easily formed.

<3-4. Fourth Modified Example>
In the above embodiment, the protruding portion 252 is a leaf spring, which is an elastic body. However, the protruding portion 252 may be an elastic body other than a leaf spring. For example, the protruding portion 252 may be another type of elastic body, such as a disc spring or rubber. However, the leaf spring is preferable in that it is easier to manufacture than other elastic bodies and is also easier to design in terms of elastic force.

<3-5. Fifth Modified Example>
In addition, the protrusion 252 may be a projection that does not have elasticity. For example, as shown in Fig. 9, the protrusion 252 may be a projection that protrudes in a semispherical shape from the outer surface of the restraint body 20 toward the inner surface of the housing 30. In addition, the restraint body 20 may be positioned relative to the housing 30 by press-fitting the protrusion 252 into the groove 313 of the housing 30.

<3-6. Sixth modification>
In the embodiment described above, a pair of protrusions 252 were provided at both ends of the restraint body 20 in the x direction. Further, in the above embodiment, a pair of protrusions 252 were provided at both ends of the restraint body 20 in the y direction. However, the protrusion 252 may be provided at only one of both ends of the restraint body 20 in the x direction, and the other end may be pressed against the side wall 312 of the housing body 31. Alternatively, the protrusion 252 may be provided at only one of both ends of the restraining body 20 in the y direction, and the other end may be pressed against the side wall 312 of the housing body 31.

<3-7. Seventh Modified Example>
In the above embodiment, one protrusion 252 is provided on each of the first end portion 21, the second end portion 22, the first side portion 23, and the second side portion 24 of the restraint body 20. However, for example, as shown in Fig. 10, multiple protrusions 252 may be provided on each of the first end portion 21 and the second end portion 22 of the restraint body 20. Similarly, multiple protrusions 252 may be provided on each of the first side portion 23 and the second side portion 24 of the restraint body 20. Two or more protrusions 252 may be inserted into one groove portion 313.

<3-8. Other Modifications>
In the above embodiment, the protrusion 252 is provided near one of both ends of the outer surface of the restraint 20 in the z direction that is farther from the bottom plate portion 311 of the housing 30. However, the protrusion 252 may be provided near one of both ends of the outer surface of the restraint 20 in the z direction that is closer to the bottom plate portion 311 of the housing 30. In addition, the protrusion 252 may be provided near the center of the restraint 20 in the z direction.

Further, the detailed configuration of power storage device 1 may be appropriately modified in design without departing from the spirit of the present invention. Furthermore, the elements appearing in the above-described embodiments or modified examples may be combined as appropriate to the extent that no contradiction occurs.

1 Power storage device 10 Cell 11 Case 20 Restraint body 21 First end portion 22 Second end portion 23 First side portion 24 Second side portion 25 Fixing member 30 Housing 31 Housing main body 32 Lid body 111 Positive electrode terminal 112 Negative electrode terminal 251 Base portion 252 Projection 310 Opening 311 Bottom plate 312 Side wall 313 Groove 321 Positive external terminal 322 Negative external terminal

Claims (6)

A cell,
A restraining body that restrains the cell;
a housing containing the cell and the restraint;
A power storage device comprising:
One of the restraint body and the housing has a protrusion protruding toward the other,
the other of the restraint body and the housing has a groove into which the protrusion is inserted. The power storage device according to claim 1,
In the power storage device, the protruding portion is an elastic body having elasticity in a direction in which the outer surface of the restraining body and the inner surface of the housing face each other. The power storage device according to claim 2,
The protrusion is a leaf spring. The power storage device according to any one of claims 1 to 3,
The protrusion is located on the outer surface of the restraint body,
In the power storage device, the groove portion is located on an inner surface of the housing. The power storage device according to claim 4,
The housing includes:
having a first inner surface and a second inner surface facing each other,
The restraint body is
having a first outer surface opposite to the first inner surface and a second outer surface opposite to the second inner surface,
The protrusion is located on the first outer surface and the second outer surface,
In the power storage device, the groove portion is located on the first inner surface and the second inner surface. The power storage device according to claim 4,
The housing includes:
A bottom plate portion;
A side wall portion extending from the bottom plate portion;
having
The protrusion is inserted into the groove at an end of the side wall portion opposite the bottom plate portion.