JP7780290B2 - Energy storage element module kit, energy storage element unit, building, and energy storage element unit installation method - Google Patents

Description

The present invention relates to an energy storage element module kit, an energy storage element unit, a building, and a method for installing an energy storage element unit.

Patent Document 1 discloses an energy storage element unit. The energy storage element unit includes a housing and multiple energy storage element modules housed within the housing. The energy storage element modules have a large number of cells.

JP 2018-181640 A

In recent years, demand for increased capacity in energy storage element units has led to larger and heavier energy storage element modules. When inspecting or repairing installed energy storage element units, the heavy energy storage element modules must be removed from their housings or reinserted into the housings, which places a heavy burden on the user.

In addition, as energy storage element units have become larger and heavier, the burden of transporting the assembled energy storage element units and installing them at the installation site has increased. As a way to deal with the increased size and weight of energy storage element units, assembling the energy storage element units at the installation site is also being considered. With this construction method, the energy storage element module is housed in a housing that is fixed to the installation site.

Against this background, there is a demand for improving the ease of handling when carrying an energy storage element module. The present invention aims to improve the ease of handling when carrying an energy storage element module.

The energy storage element module kit according to the present invention comprises:
a power storage element module;
a first handle member attached to the energy storage element module;
a second handle member attached to the energy storage element module,
The first handle member and the second handle member are swingable relative to the energy storage element module when attached to the energy storage element module.

In the energy storage element module kit according to the present invention,
the first handle member is swingable on a side away from the second handle member when attached to the energy storage element module,
The second handle member may be swingable on a side away from the first handle member when attached to the energy storage element module.

In the energy storage element module kit according to the present invention,
a swingable angle range on a side away from the second handle member of the first handle member when the first handle member is attached to the energy storage element module is larger than a swingable angle range on a side approaching the second handle member,
When the second handle member is attached to the energy storage element module, the range of angles at which it can be swung on the side away from the first handle member may be greater than the range of angles at which it can be swung on the side approaching the first handle member.

In the energy storage element module kit according to the present invention,
the first handle member attached to the energy storage element module housed in a housing can swing within a range where it does not come into contact with the housing,
The second handle member attached to the energy storage element module housed in the housing may be swingable within a range where it does not come into contact with the housing.

In the energy storage element module kit according to the present invention,
the energy storage element module includes a first protrusion provided at a position away from a swing center of the first handle member,
The first handle member is restricted from swinging away from the second handle member by contacting the first protrusion,
the energy storage element module includes a second protrusion provided at a position away from a swing center of the second handle member,
The second handle member may be restricted from swinging away from the first handle member by contacting the second protrusion.

In the energy storage element module kit according to the present invention, the center of gravity of the energy storage element module may be located between the swing center of the first handle member and the swing center of the second handle member.

In the energy storage element module kit according to the present invention,
the first handle member and the second handle member are attached to the energy storage element module at positions spaced apart from each other in the longitudinal direction of the energy storage element module;
A pivot center of the first handle member and a pivot center of the second handle member may be perpendicular to the longitudinal direction of the energy storage element module.

The energy storage element unit according to the present invention comprises:
Any one of the energy storage element module kits according to the present invention;
and a housing that houses the energy storage element module.

A building according to the present invention is equipped with an energy storage element unit according to the present invention.

The method for installing an energy storage element unit according to the present invention includes the steps of:
attaching the first handle member and the second handle member of any one of the energy storage element module kits according to the present invention to the energy storage element module of the energy storage element module kit;
and a step of gripping the first handle member and the second handle member and placing the energy storage element module in a housing.

The present invention improves the ease of handling when carrying an energy storage element module.

FIG. 1 is a diagram for explaining an embodiment of the present invention, and is an exploded perspective view showing an example of an energy storage element unit. FIG. 2 is a perspective view showing the energy storage element unit of FIG. 1 with some components omitted. FIG. 3 is a perspective view showing an example of an energy storage element module kit included in the energy storage element unit. FIG. 4 is an exploded perspective view showing the energy storage element module included in the energy storage element module kit of FIG. FIG. 5 is a side view showing the energy storage element module kit of FIG. 3 with the handle member attached to the energy storage element module. FIG. 6 is a partially enlarged view corresponding to FIG. 5, showing a state in which the handle member has swung relative to the energy storage element module. FIG. 7 is a partially enlarged view corresponding to FIG. 5, showing a state in which the handle member has swung relative to the energy storage element module. FIG. 8 is a top view showing the energy storage element module of FIG. FIG. 9 is an enlarged top view of part A in FIG. 8, showing the opening and the connecting portion provided in the first side wall portion. FIG. 10 is a cross-sectional view taken along line BB in FIG. 9, showing the opening and the connecting portion provided in the first side wall portion. FIG. 11 is a side view showing the same portion of the first side wall as FIG. FIG. 12 is a top view corresponding to FIG. 9, showing a state in which the hook of the handle member is inserted into the opening of the first side wall portion. FIG. 13 is a cross-sectional view taken along line CC of FIG. FIG. 14 is a view corresponding to FIG. 9, showing a state in which the hooks are arranged in different positions from those in FIG. FIG. 15 is a cross-sectional view corresponding to FIG. 13, showing a state in which the handle member is attached to the energy storage element module. FIG. 16 is a top view showing the energy storage element module kit of FIG. 3, showing a state in which a handle member is attached to the energy storage element module.

An embodiment of the present invention will now be described with reference to the drawings. Note that in the drawings accompanying this specification, the scale and aspect ratios have been appropriately altered and exaggerated from their actual sizes for the sake of clarity and ease of understanding. Furthermore, configurations shown in some drawings may be omitted in other drawings.

In this specification, terms that specify shapes and geometric conditions, as well as their degrees, such as "parallel," "orthogonal," and "identical," as well as length and angle values, are not limited to their strict meanings, but are interpreted to include the range of degrees to which similar functions can be expected.

To clarify the directional relationships between the drawings, the first direction D1, second direction D2, third direction D3, Z direction DZ, X direction DX, and Y direction DY are indicated by arrows as directions common to the drawings. The tip of the arrow is the first side of each direction D1, D2, D3, DZ, DX, and DY. In each direction, the side opposite the first side is the second side. Arrows pointing away from the paper in a direction perpendicular to the paper surface are indicated by symbols with a dot in a circle, as shown in Figure 5, for example.

The Z direction DZ, X direction DX, and Y direction DY are used for the energy storage element module 40. The first direction D1, second direction D2, and third direction D3 are used for the energy storage element unit 10. That is, the first direction D1, second direction D2, and third direction D3 are used for the energy storage element module 40 when it is properly housed in the housing box 15 or the internal space 15S.

Figures 1 to 16 are diagrams illustrating one embodiment. Of these, Figure 1 is an exploded perspective view showing the energy storage element unit 10, and Figure 2 is a perspective view showing the energy storage element unit 10 with some components removed. The energy storage element unit 10 is used as a secondary battery unit that can be charged and discharged. The illustrated energy storage element unit 10 is applied to buildings such as homes and public facilities, for example. The energy storage element unit 10 is electrically connected to the building's wiring and functions as a power source for electrical devices installed within the building.

In the example shown in FIG. 2, the energy storage element unit 10 includes a storage box 15, an energy storage element module 40, and a pair of handle members 35. The energy storage element module 40 is housed in an internal space 15S within the storage box 15. The pair of handle members 35 are used when handling the energy storage element module 40. In this embodiment, measures have been taken to improve the ease of handling when carrying the energy storage element module 40.

As shown in FIG. 1, the storage box 15 may include a cover plate 18 and a housing 20. The illustrated housing 20 has a rectangular parallelepiped shape with one side open. The housing 20 has an opening 20A that opens to a first side in the third direction D3. In a specific application, the Z direction DZ may be a vertical direction, and the first side in the Z direction DZ may be the upper side in the vertical direction. The illustrated cover plate 18 is plate-shaped. The cover plate 18 is detachable from the housing 20. The cover plate 18 is attached to the housing 20 to close the opening 20A. Between the housing 20 and the cover plate 18, a rectangular parallelepiped internal space 15S is formed to accommodate the energy storage element module 40 and the like. The housing 20 and the cover plate 18 have the strength required to accommodate the heavy energy storage element module 40. The housing 20 and the cover plate 18 may, for example, include a frame and a panel material fixed to the frame. The frame is made of, for example, metal. The panel is made of, for example, metal or resin.

The housing 20 includes a bottom wall portion 21 and a side wall portion 22 extending from the bottom wall portion 21. The side wall portion 22 extends from the bottom wall portion 21 to a first side in the third direction D3. The bottom wall portion 21 defines an internal space 15S from a second side in the third direction D3. The side wall portion 22 includes a first side wall portion 22A, a second side wall portion 22B, a third side wall portion 22C, and a fourth side wall portion 22D. The first side wall portion 22A and the second side wall portion 22B face in the first direction D1. The first side wall portion 22A defines the internal space 15S from a first side in the first direction D1. The third side wall portion 22C and the fourth side wall portion 22D face in the second direction D2. The third side wall portion 22C defines the internal space 15S from the first side in the second direction D2. Figure 2 shows the housing 20 with the first side wall portion 22A and the third side wall portion 22C removed.

As shown in FIG. 2, the energy storage element unit 10 may include multiple energy storage element modules 40. In the internal space 15S of the housing box 15, multiple energy storage element modules 40 may be stacked in the third direction D3. In the internal space 15S, multiple energy storage element modules 40 may be arranged in the first direction D1. The number of energy storage element modules 40 housed in the housing 20 may be selected appropriately depending on the electrical characteristics required of the energy storage element unit 10.

In the illustrated example, the energy storage element unit 10 includes a first group G1 of energy storage element modules and a second group G2 of energy storage element modules. The first group G1 includes three energy storage element modules 40 stacked in the third direction D3. The second group G2 includes four energy storage element modules 40 stacked in the third direction D3. The first group G1 and the second group G2 are arranged adjacent to each other in the first direction D1. The first group G1 is located on a first side in the first direction D1, and the second group G2 is located on a second side in the first direction D1. The first group G1 and the second group G2 are arranged at the same position in the second direction D2.

The energy storage element module 40 may include cells 41 and a case 45 that houses the cells 41. The cells 41 are the smallest units that can be used as an energy storage element. Figures 3 and 4 are perspective views showing an example of an energy storage element module 40. Figure 3 is a perspective view showing an energy storage element module kit. That is, Figure 3 is a perspective view showing the energy storage element module 40 together with a pair of handle members 35. Figure 4 is an exploded perspective view showing the energy storage element module 40 shown in Figure 3 with the end covers 46 and 47 removed. As shown in Figure 4, the case 45 may include a case main body 50 and a case lid 70.

As shown in FIG. 4 , the cell 41 has a flattened shape and extends in the X direction DX and the Y direction DY. In the illustrated example, multiple cells 41 are stacked in the Z direction DZ, which is perpendicular to both the X direction DX and the Y direction DY. The cell 41 has a rectangular shape in a plan view. The cell 41 has a short side of the rectangular shape in the X direction DX and a long side of the rectangular shape in the Y direction DY. The X direction DX and the Y direction DY are perpendicular to each other. The cell 41 shown in FIG. 4 includes an outer casing 42 that houses multiple electrode plates (not shown), including positive and negative electrode plates, and a pair of tabs 43 that are electrically connected to the electrode plates and extend to the outside of the outer casing 42. The pair of tabs 43 function as positive and negative terminals, respectively. Due to the electrode plates housed in the outer casing 42, the thickness of the central portion 41c of the cell 41 is thicker than the thickness of the peripheral portion 41e located around the central portion 41c.

As shown in FIG. 3, the energy storage element module 40 has a longitudinal direction in the Y direction DY. The energy storage element module 40 has a thickness direction in the Z direction DZ. The energy storage element module 40 has a lateral direction in the X direction DX. As shown in FIG. 2, the energy storage element module 40 shown in FIGS. 3 and 4 is housed in the housing box 15 so that the X direction DX is parallel to the first direction D1, the Y direction DY is parallel to the second direction D2, and the Z direction DZ is parallel to the third direction D3.

As shown in FIG. 2, the energy storage element unit 10 may further include stoppers 28 that secure the first group G1 and the second group G2 to the housing box 15. In the illustrated example, the stoppers 28 include a first stopper 28A that secures the first group G1 and a second stopper 28B that secures the second group G2. The illustrated stoppers 28 are removably attached to the housing 20 at both ends in the second direction D2. The first stopper 28A secured to the housing 20 contacts the first group G1 from a first side in the third direction D3. The first stopper 28A holds the first group G1 between itself and the bottom wall 21. The second stopper 28B secured to the housing 20 contacts the second group G2 from a first side in the third direction D3. The second stopper 28B holds the second group G2 between itself and the bottom wall 21.

As shown in FIG. 2, the energy storage element unit 10 may further include a control module 25. The illustrated control module 25 is disposed on the second stopper 28B. The control module 25 may have one or more of the following functions: controlling the charging and discharging of the multiple energy storage element modules 40; monitoring the charge state (e.g., charge amount) of the energy storage element modules 40; and monitoring the presence or absence of abnormalities in the energy storage element modules 40. The control module 25 may transmit information such as the charge state and monitoring results of the presence or absence of abnormalities of the energy storage element modules 40 to a control device installed outside the energy storage element unit 10. The control module 25 may also include a switch that switches between electrical connection and disconnection between wiring external to the energy storage element unit 10 (e.g., building wiring) and the energy storage element modules 40.

In FIG. 2, a pair of handle members 35 are disposed on the first stopper 28A. As described above, the handle members 35 are used when carrying the energy storage element module 40. As shown in FIGS. 5 to 7, the handle members 35 are attached to the energy storage element module 40. An operator can carry the energy storage element module 40 by grasping the handle members 35. When not in use, the handle members 35 may be stored in the internal space 15S of the storage box 15, as in the example shown. In the example shown in FIG. 2, the pair of handle members 35 during storage are each screwed to the first stopper 28A. However, this example is not limiting, and the handle members 35 may also be stored somewhere other than the internal space 15S of the storage box 15.

Next, we will further explain the handle member 35 and the case 45 of the energy storage element module 40 to which the handle member 35 can be attached.

The energy storage element unit 10 and the energy storage element module kit 30 include a pair of handle members 35. The pair of handle members 35 includes a first handle member 35A and a second handle member 35B. The first handle member 35A and the second handle member 35B may have different configurations. The first handle member 35A and the second handle member 35B may have the same configuration, as in the example shown. In the following description, matters that may be common to the first and second handle members 35A, 35B will be described simply as "handle member 35" without distinguishing between the first and second handle members 35A, 35B.

The handle member 35, together with the energy storage element module 40, constitutes the energy storage element module kit 30. The handle member 35 can be attached to the energy storage element module 40. As in the illustrated example, the handle member 35 may also be detachable from the energy storage element module 40. The handle member 35 may be made by cutting and bending a metal plate.

In the example shown in FIG. 3, the handle member 35 includes a grip portion 36 for an operator to grasp and a pair of hooks 37 formed from a plate-shaped material. The grip portion 36 includes a base portion 36a and a pair of extension portions 36b rising from the base portion 36a. The base portion 36a and the extension portions 36b are connected. The base portion 36a is located between the pair of extension portions 36b. Both the base portion 36a and the extension portions 36b are plate-shaped. The base portion 36a has a rectangular shape including a pair of short sides and a pair of long sides. Each extension portion 36b is connected to the long sides of the base portion 36a. The base portion 36a and the extension portions 36b are connected so that they are non-parallel, more specifically, perpendicular to each other. The base portion 36a and the pair of extension portions 36b may be formed by bending a single metal plate. As shown in FIG. 3, at least one of the extension portions 36b may have a through hole 36c through which a screw passes for fixing the handle member 35 to the stopper 28. In the example shown in FIG. 2, the handle member 35 is attached to the stopper 28 so that the extension portion 36b with the through hole 36c comes into contact with the stopper 28. According to this example, when the handle member 35 is attached to the stopper 28, the extension portion 36b comes into surface contact with the stopper 28, and the handle member 35 is stably held on the stopper 28.

In the example shown in FIG. 3, a pair of hooks 37 extend from each short side of the base portion 36a. Each hook 37 is formed from a plate-shaped material. The pair of hooks 37 extend from each short side of the base portion 36a so as to bend relative to the base portion 36a. In the example shown, the width of the plate-shaped material along the short side of the base portion 36a decreases as it moves away from the base portion 36a. The hook 37 includes a hook-shaped portion 37X that is curved 180 degrees in a U-shape at the end region away from the base portion 36a. This curved hook-shaped portion 37X forms a hook shape. The axis of curvature forming the hook shape extends normal to the plate surface of the plate-shaped material forming the hook 37. In the example shown, the pair of hooks 37 face each other in a direction along the long side of the base portion 36a. The pair of hooks 37 have the same shape. The protruding end 37b of the hook-shaped portion 37X of each hook 37, which forms the edge away from the base portion 36a, has a curved outer contour. In addition, the hook tip 37a, which is the end of the curved hook-shaped portion 37X, also has a curved contour.

As shown in FIG. 4 , the case body 50 has a bottom 51 and sidewalls 52 extending from the bottom 51. The bottom 51 and sidewalls 52 define an internal space 15S that accommodates multiple cells 41. In the illustrated example, the bottom 51 faces the multiple cells 41 from the Z direction DZ. The bottom 51 supports the multiple cells 41 stacked in the Z direction DZ. The sidewalls 52 surround the multiple cells 41 housed in the case body 50 from a direction perpendicular to the Z direction DZ toward the bottom 51. The sidewalls 52 protect the multiple cells 41 and restrict relative movement of the cells 41 with respect to the case body 50 in a direction perpendicular to the Z direction DZ. On the other hand, the sidewalls 52 allow relative movement of the cells 41 with respect to the case body 50 in the Z direction DZ. The case body 50 may be formed by integral molding of a resin material, or by assembling a bottom portion 51 and a side wall portion 52 that are separately molded from a resin material.

As shown in FIG. 4 , the side wall portion 52 includes a first side wall portion 52A, a second side wall portion 52B, a third side wall portion 52C, and a fourth side wall portion 52D. The first side wall portion 52A and the second side wall portion 52B face each other in the X direction DX. The first side wall portion 52A defines the internal space 15S from a first side in the X direction DX. The third side wall portion 52C and the fourth side wall portion 52D face each other in the Y direction DY. The third side wall portion 52C defines the internal space 15S from a first side in the Y direction DY.

In the example shown in FIG. 4, the first side wall portion 52A and the second side wall portion 52B are provided with protrusions 53 that protrude toward a first side in the Z direction DZ. The protrusions 53 contact another storage element module 40 that is stacked from the first side in the Z direction DZ and support the other storage element module 40 from the second side in the Z direction DZ. In the example shown, the first side wall portion 52A and the second side wall portion 52B are provided with multiple protrusions 53 arranged along the Y direction DY. In the example shown in FIG. 4, the first side wall portion 52A and the second side wall portion 52B are provided with receiving portions 54 that receive the protrusions 53 of the other storage element module 40 located on the second side in the Z direction DZ. By accommodating the protrusions 53 in the receiving portions 54, not only is it possible to maintain the relative positions of two adjacent energy storage element modules 40 in the Z direction DZ, but it is also possible to restrict relative movement of the two energy storage element modules 40 in a direction non-parallel to the Z direction DZ. In the illustrated example, multiple receiving portions 54 are arranged along the Y direction DY on the first side wall portion 52A and the second side wall portion 52B.

In the example shown in FIG. 4, each of the first side wall portion 52A and the second side wall portion 52B includes a main wall portion 60a and an outer wall portion 60b that face each other in the X direction DX in a region that is a first side in the Z direction DZ and away from the bottom portion 51. The main wall portion 60a extends from the bottom portion 51 in the Z direction DZ. The outer wall portion 60b is located outside the main wall portion 60a. "Outside" means outside away from the internal space 15S. In other words, the main wall portion 60a is located between the internal space 15S and the outer wall portion 60b in the X direction DX. The outer wall portion 60b forms a gap with the main wall portion 60a. The outer wall portion 60b is connected to the main wall portion 60a and is maintained in a predetermined relative position with respect to the main wall portion 60a.

Furthermore, as shown in FIG. 4, the outer wall portion 60b may have a receiving portion 60e that opens outward in the X direction DX. In the example shown, multiple receiving portions 60e are provided at intervals in the Y direction DY. The receiving portions 60e can hold the case lid 70 to the case main body 50 by engaging with a fixing portion 72 of the case lid 70 (described below) that is inserted between the main wall portion 60a and the outer wall portion 60b.

Next, the opening 61, connecting portion 62, second opening 65, and side opening 66 provided in the first side wall portion 52A and the second side wall portion 52B, respectively, will be described using Figures 8 to 11.

8 is a plan view showing the energy storage element module 40 shown in FIGS. 3 and 4. FIG. 9 is an enlarged view of portion A in FIG. 8, showing a top view of the opening 61 and the connecting portion 62 provided in the first side wall portion 52A. As shown in FIGS. 8 and 9, the pair of walls 60a, 60b are spaced apart from each other. The first side wall portion 52A formed by the pair of walls 60a, 60b opens to the first side in the Z direction DZ. This opening forms an opening 61 into which the hook 37 can be inserted. In addition, a connecting portion 62 is provided between the pair of walls 60a, 60b, onto which the hook 37 inserted into the opening 61 can be hung. In the illustrated example, the space in which the handle member 35 attached to the energy storage element module 40 is located and the space through which the handle member 35 moves to attach to the energy storage element module 40 are formed between the pair of walls 60a, 60b, which are inside the first side wall portion 52A. The space within the first side wall portion 52A in which the handle member 35 is located is separated from the internal space 15S that houses the cells 41 by the main wall portion 60a. Therefore, when attaching the handle member 35 to the energy storage element module 40, when carrying the energy storage element module 40, and when removing the handle member 35 from the energy storage element module 40, the hook 37 is prevented from coming into contact with the multiple cells 41. As a result, damage to the cells 41 caused by the hook 37 coming into contact with the cells 41 can be reduced.

As shown in FIG. 8 , the opening 61 and the connecting portion 62 are provided in the first side wall portion 52A and the second side wall portion 52B, respectively. The first side wall portion 52A and the second side wall portion 52B are spaced apart from each other in the X-direction DX. Furthermore, each pair of wall portions 60a, 60b included in the first side wall portion 52A and the second side wall portion 52B faces each other in the X-direction DX. In this example, the pair of hooks 37 of the handle member 35 can be inserted into the openings 61 provided in the first side wall portion 52A and the second side wall portion 52B, respectively. Furthermore, the pair of hooks 37 can be hooked onto the connecting portions 62 provided in the first side wall portion 52A and the second side wall portion 52B, respectively. This allows the handle member 35 having the pair of hooks 37 to be attached to the energy storage element module 40.

In the illustrated example, multiple openings 61 and connecting portions 62 are provided in the first side wall portion 52A and spaced apart in the Y direction DY. Multiple openings 61 and connecting portions 62 are also provided in the second side wall portion 52B and spaced apart in the Y direction DY. Specifically, two openings 61 and connecting portions 62 are provided in the first side wall portion 52A and spaced apart in the Y direction DY. Two openings 61 and connecting portions 62 are also provided in the second side wall portion 52B and spaced apart in the Y direction DY. According to this example, the first handle member 35A and the second handle member 35B can be attached to the energy storage element module 40, as shown in Figures 5 and 16.

In the illustrated example, the opening 61 and the connecting portion 62 are arranged adjacent to each other in the Y direction DY. In the adjacent openings 61 and connecting portions 62, the connecting portion 62 is arranged further outward in the Y direction DY than the opening 61, i.e., on the side away from the side wall center line WL, which bisects the dimensions of the first side wall portion 52A and the second side wall portion 52B along the Y direction DY.

Furthermore, in the illustrated example, the opening 61 provided in the first side wall portion 52A and the opening 61 provided in the second side wall portion 52B face each other in the X direction DX. The connecting portion 62 provided in the first side wall portion 52A and the connecting portion 62 provided in the second side wall portion 52B face each other in the X direction DX. In other words, the opening 61 provided in the first side wall portion 52A and the opening 61 provided in the second side wall portion 52B are arranged at the same position in the Y direction DY. The connecting portion 62 provided in the first side wall portion 52A and the connecting portion 62 provided in the second side wall portion 52B are arranged at the same position in the Y direction DY. Therefore, as shown in FIG. 8 , each pair of walls 60a, 60b of the first side wall 52A and the second side wall 52B has, along the Y direction DY, two first regions WA in which openings 61 and connecting portions 62 are provided, and a second region WB in which openings 61 and connecting portions 62 are not provided. In one of the two first regions WA, the first handle member 35A is attached to the energy storage element module 40. In the other of the two first regions WA, the first handle member 35A is attached to the energy storage element module 40.

The opening 61 and connecting portion 62 will be described in further detail below.

As shown in Figures 8 and 9, the opening 61 opens to a first side in the Z direction DZ. In the illustrated example, the opening 61 has a substantially rectangular shape when viewed from the first side in the Z direction DZ. The length of the opening 61 along the Y direction DY is longer than the length of the opening 61 along the X direction DX. That is, in the illustrated example, the opening 61 has a short direction in the X direction DX and a long direction in the Y direction DY. Furthermore, the opening 61 has an opening edge 61a on the first side in the Y direction DY formed by a first partition wall 63a connecting the main wall portion 60a and the outer wall portion 60b.

As clearly shown in Figures 9 and 10, the pair of wall portions 60a, 60b have ribs 64 on their opposing surfaces. Figure 10 shows a cross section taken along line B-B in Figure 9. The ribs 64 protrude from each of the pair of wall portions 60a, 60b toward the wall center line OL, which bisects the dimension of the opening 61 along the X direction DX. As shown in Figure 9, the ribs 64 have a rectangular shape when viewed from above. The ribs 64 reinforce the pair of wall portions 60a, 60b near the elongated opening 61. The ribs 64 also smoothly guide the movement of the hook 37 in the Z direction DZ after it passes through the opening 61. The ribs 64 may be made of, for example, a resin material.

In the illustrated example, each of the pair of wall portions 60a, 60b facing each other in the X direction DX has a plurality of ribs 64 spaced apart in the Y direction DY. As shown in Figures 9 and 10, the ribs 64 are provided at intervals in the Y direction DY.

As shown in Figure 9, the width of the opening 61 in the X-direction DX where the rib 64 is provided is the minimum width of the opening 61 in the X-direction DX. The minimum width of the opening 61 in the X-direction DX where the pair of wall portions 60a, 60b face each other is preferably greater than the thickness of the hook 37 to enable the hook 37 to be attached and detached. In particular, it is more preferable that the ratio of the minimum width of the opening 61 in the X-direction DX where the pair of wall portions 60a, 60b face each other to the thickness of the hook 37 be 1.5 or greater. Furthermore, it is preferable that the ratio of the minimum width of the opening 61 in the X-direction DX where the pair of wall portions 60a, 60b face each other to the thickness of the hook 37 be 1.8 or less.

The ribs 64 protruding from the main wall portion 60a and the ribs 64 protruding from the outer wall portion 60b may have different protruding heights. In the illustrated example, the protruding height of the ribs 64 protruding from the outer wall portion 60b in the X direction DX is greater than the protruding height of the ribs 64 protruding from the main wall portion 60a in the X direction DX. Therefore, the ribs 64 can effectively reinforce the outer wall portion 60b, which is not directly connected to the bottom portion 51, as shown in FIG. 3.

As shown in Figures 9 and 10, a connecting portion 62 is provided between the pair of wall portions 60a, 60b, to which the hook 37 inserted into the opening 61 is attached. In the example shown in Figure 9, the connecting portion 62 extends along the X-direction DX and connects the main wall portion 60a and the outer wall portion 60b. As shown in Figure 10, the connecting portion 62 includes a first connecting portion 62a to which the hook 37 is attached and a second connecting portion 62b connected to the first connecting portion 62a. When viewed from the X-direction DX, the first connecting portion 62a extends along an arc, such as a circular arc or an elliptical arc. As shown in Figure 11, the connecting portion 62 has a curved surface 62s extending in an arc shape when viewed from a first side in the X-direction DX. The first connecting portion 62a extends along a semicircular arc that is convex toward the second side in the Z-direction DZ, or convex downward in the illustrated example. As a result, the first connecting portion 62a is a curved plate-like portion. The second connecting portion 62b extends in the Z direction DZ from the first side edge of the pair of wall portions 60a, 60b in the Z direction DZ to the first connecting portion 62a. The second connecting portion 62b reinforces the first connecting portion 62a, on which the hook 37 is hung, from the first side in the Z direction DZ.

8 and 9, the pair of wall portions 60a, 60b are provided with a second opening 65 that opens to a first side in the Z direction DZ. The hook tip portion 37a of the hook 37 can be inserted into the second opening 65. The second opening 65 is provided on the outer side in the Y direction DY relative to the connecting portion 62, i.e., on the side away from the side wall portion center line WL. In other words, the connecting portion 62 is located between the opening (first opening) 61 and the second opening 65 in the Y direction DY. In the example shown in FIG. 9, the second opening 65 forms an opening edge 65a on a second side in the Y direction DY by a second partition wall 63b connecting the main wall portion 60a and the outer wall portion 60b. The second opening 65 has a substantially rectangular shape when observed from the first side in the Z direction DZ. The second opening 65 has lengths in both the X direction DX and the Y direction DY. In the illustrated example, the length of the second opening 65 along the Y direction DY is shorter than the length of the opening (first opening) 61 along the Y direction DY.

In the example shown in FIG. 11 , the outer wall portion 60b has a side opening 66 that opens in the X direction DX. The side opening 66 has lengths in the Z direction DZ and the Y direction DY. In the illustrated example, the opening edge 66a located on the first side of the side opening 66 in the Z direction DZ is formed by the connecting portion 62 in at least a portion of the opening edge 66a. This specific example allows the worker to easily observe the relative position of the hook 37 inserted into the opening 61 with respect to the connecting portion 62. That is, when the hook 37 is engaged with or about to be engaged with the connecting portion 62, the worker can observe the hook 37 from the side opening 66. On the other hand, when the hook 37 is not engaged with the connecting portion 62, the worker cannot observe the hook 37 from the side opening 66. As a result, the worker can easily confirm whether the handle member 35 is properly attached to the energy storage element module 40.

As shown in FIG. 4 , the case 45 includes a case lid 70 that partitions the internal space 15S from a first side in the Z direction DZ. The case lid 70 is a plate-shaped member held by the case body 50. The case lid 70 protects the cells 41 housed in the case body 50 and restricts relative movement of the cells 41 with respect to the case body 50 in the Z direction DZ. The case lid 70 is a plate-shaped member made of, for example, resin. As shown in FIG. 4 , the case lid 70 may include a cover body 71 and a fixing portion 72 extending from the cover body 71. The fixing portion 72 is engageable with a receiving portion 60e provided on the outer wall portion 60b of the first side wall portion 52A and the second side wall portion 52B. The fixing portion 72 engages with the receiving portion 60e, thereby holding the case lid 70 in place by the case body 50. In the illustrated example, the fixing portion 72 engages with the receiving portion 60e so as to be movable in the Z direction DZ toward the bottom portion 51.

As already explained using FIG. 8 , each pair of wall portions 60a, 60b of the first side wall portion 52A and the second side wall portion 52B includes, along the Y direction DY, a first region WA in which the opening 61 and the connecting portion 62 are provided, and a second region WB in which the opening 61 and the connecting portion 62 are not provided. As shown in FIG. 8 , the width LC of the case lid body 70 along the X direction DX in the first region WA is equal to or less than the separation distance LD (see FIG. 4) between the side walls 52a, 52b in the X direction DX. In other words, it is equal to or less than the width LD (see FIG. 4) along the X direction DX of the storage space of the cell 41 formed by each main wall portion 60a of the side walls 52a, 52b. Therefore, in the first region WA, the case lid body 70 does not cover the opening 61 and the connecting portion 62 provided in the pair of wall portions 60a, 60b from the first side in the Z direction DZ. In this example, the hook 37 of the handle member 35 can be inserted into the opening 61 even when the case lid 70 is attached. Therefore, the energy storage element module 40 can be easily carried while protecting the multiple cells 41 housed in the case body 50 from above.

Next, we will explain the operation of the energy storage element module 40 configured as described above. First, we will explain how to attach the handle member 35 to the energy storage element module 40.

First, as shown in Figures 12 and 13, the pair of hooks 37 of the handle member 35 are inserted into the openings 61 provided in the first side wall portion 52A and the second side wall portion 52B. Figure 12 shows the state in which the hooks 37 of the handle member 35 have been inserted into the openings 61 of the first side wall portion 52A, as viewed from the first side in the Z direction DZ.

In the illustrated example, the ratio of the minimum width of the opening 61 in the X-direction DX to the thickness of the hook 37 is 1.5 or greater. According to this specific example, the width of the opening 61 in the X-direction DX is ensured to be sufficiently large relative to the thickness of the hook 37. Therefore, the hook 37 can be easily inserted into the opening 61. Furthermore, in the illustrated example, the ratio of the minimum width of the opening 61 to the thickness of the hook 37 is 1.8 or less. According to this specific example, it is possible to prevent the hook 37 from unintentionally moving in the X-direction DX within the opening 61. As a result, the installation of the handle member 35 to the energy storage element module 40 can be facilitated.

In the illustrated example, the pair of wall portions 60a, 60b have ribs 64 on their opposing surfaces. According to this specific example, the width of the opening 61 in the X direction DX is minimized in the area where the ribs 64 are provided. When the hook 37 inserted into the opening 61 moves in the X direction DX relative to the energy storage element module 40, the hook 37 comes into contact with the ribs 64. This reduces the contact area between the hook 37 and the wall portions 60a, 60b and reduces frictional resistance caused by contact between the hook 37 and the wall portions 60a, 60b. Furthermore, because the ribs 64 protruding in the X direction DX extend in the Z direction DZ, movement of the handle member 35 in the Z direction DZ can be smoothly guided. This facilitates the attachment of the handle member 35 to the energy storage element module 40.

In the illustrated example, the outer wall portion 60b is located outside the main wall portion 60a that defines the internal space 15S in the X-direction DX. The protruding height in the X-direction DX of the ribs 64 protruding from the outer wall portion 60b is greater than the protruding height in the X-direction DX of the ribs 64 protruding from the main wall portion 60a. According to this example, the outer wall portion 60b can be sufficiently reinforced by the ribs 64, thereby making the outer wall portion 60b smaller and lighter. Furthermore, making the outer wall portion 60b smaller and lighter allows for the energy storage element module 40 and the energy storage element unit 10 to be made smaller and lighter.

The pair of hooks 37 inserted into the opening 61 are then further inserted between the pair of wall portions 60a, 60b toward the second side in the Z direction DZ. When the hook tip portions 37a of the hooks 37 reach the second side in the Z direction DZ beyond the connecting portion 62, the handle member 35 is then moved toward the second side in the Y direction DY, as shown in FIG. 14. The handle member 35 is moved in the second direction D2 until the hook tip portions 37a are positioned on the second side in the Y direction DY beyond the connecting portion 62.

In the illustrated example, the connecting portion 62 has an arc-shaped outline when viewed from the outside in the X direction DX. According to this specific example, even if the hook tip 37a of the hook 37 inserted into the opening 61 does not reach the second side in the Z direction DZ of the connecting portion 62, the hook tip 37a of the hook 37 moving in the Y direction DY slides on the curved surface 62s of the connecting portion 62, and the hook 37 is guided toward the second side in the Y direction DY. As a result, the handle member 35 reaches the position shown in FIG. 14.

Next, when the hook tip 37a reaches the second side in the Y direction DY beyond the connecting portion 62, the handle member 35 is moved toward the first side in the Z direction DZ, as shown in FIG. 15. Even if the hook tip 37a has not yet reached the second side in the Y direction DY beyond the connecting portion 62, the hook tip 37a of the hook 37 moving in the Z direction DZ slides along the curved surface 62s of the connecting portion 62 and is guided toward the second side in the Y direction DY. In the illustrated example, the pair of wall portions 60a, 60b are provided with a second opening 65 that opens toward the first side in the Z direction DZ. Contact between the hook tip 37a and the connecting portion 62 guides the hook tip 37a toward the second opening 65. As a result, the handle member 35 reaches the position shown in FIG. 15.

As shown in FIG. 15 , when the hook 37 moves to the first other side in the Z direction DZ, the hook tip 37a passes through the second opening 65 and is exposed from the side wall portions 52A, 52B. Then, the protruding end portion 37b of the hook 37, which is farthest from the gripping portion 36, comes into contact with the curved surface 62s of the connecting portion 62 from the second side in the Z direction DZ. In this example, the hook tip 37a protruding from the second opening 65 allows confirmation that the handle member 35 is attached in the appropriate position relative to the energy storage element module 40.

In the illustrated example, the length of the second opening 65 along the Y direction DY is shorter than the length of the opening (first opening) 61 along the Y direction DY. According to this specific example, the hook tip 37a of the hook 37 that has passed through the second opening 65 is restricted from moving in the X direction DX and the Y direction DY by the second opening 65. This allows the second opening 65 to restrict relative movement of the handle member 35 attached to the energy storage element module 40 with respect to the energy storage element module 40. As a result, the handle member 35 can be stably maintained in an appropriate position with respect to the energy storage element module 40.

In this manner, the handle member 35 (Figure 5) is attached to the energy storage element module 40. Note that the handle member 35 can be removed from the energy storage element module 40 by reversing the steps described above.

Next, we will explain how the handle member 35 works when carrying the energy storage element module 40.

In the illustrated example, the energy storage element unit 10 and the energy storage element module kit 30 include a first handle member 35A and a second handle member 35B. Each side wall portion 52A, 52B of the case body 50 includes two connecting portions 62 spaced apart in the Y direction DY. As shown in FIGS. 5 and 16 , the two hooks 37 included in the first handle member 35A are hooked to the connecting portion 62 located on a second side in the Y direction DY of the first side wall portion 52A and the connecting portion 62 located on a second side in the Y direction DY of the second side wall portion 52B. Similarly, the two hooks 37 included in the second handle member 35B are hooked to the connecting portion 62 located on a first side in the Y direction DY of the first side wall portion 52A and the connecting portion 62 located on a first side in the Y direction DY of the second side wall portion 52B. The worker holds the grip portion 36 of the first handle member 35A with one hand and the grip portion 36 of the second handle member 35B with the other hand, and carries the energy storage element module 40 via the first and second handle members 35A, 35B.

The energy storage element module 40 is transported when assembling, inspecting, maintaining, repairing, etc. the energy storage element unit 10. During these operations, the energy storage element module 40 is carried into and removed from the storage box 15. If the storage box 15 includes a housing 20 and a cover plate 18, the storage element module 40 is carried into and removed from the housing 20 through the opening 20A that is opened by removing the cover plate 18. In other words, access to the internal space 15S of the storage box 15 is restricted to the route via the opening 20A of the housing 20.

Recently, due to demands for increased capacity in energy storage element units, energy storage element units have become larger and heavier. This has increased the burden of transporting assembled energy storage element units and installing them at the installation site. As a way to deal with the increased size and weight of energy storage element units, one approach being considered is to assemble the energy storage element units at the installation site, thereby reducing the burden of transporting and installing large and heavy energy storage element units at the installation site. However, due to demands for increased capacity in energy storage element units, the weight of energy storage element modules has also increased. For this reason, it is first necessary to reduce the burden of transporting energy storage element modules.

Recently, due to demands for increased capacity in energy storage element units, the dimensions of energy storage element modules have become larger and the weight of energy storage element modules has increased. This has resulted in an increased burden when transporting energy storage element modules. Furthermore, as energy storage element units have become larger and heavier, the burden of transporting assembled energy storage element units and installing them at their installation locations has also increased.

One method being considered to address the increased size and weight of energy storage element units is to assemble the energy storage element unit at the installation site, thereby reducing the burden of transporting and installing the large and heavy energy storage element unit at the installation site. In this construction method, first, as described above, the first and second handle members 35A, 35B are attached to the energy storage element module 40. Next, the worker grasps the first and second handle members 35A, 35B and places the energy storage element module 40 in the housing 20 fixed to the installation site. Thereafter, the energy storage element module 40 is fixed to the housing 20 with the stopper 28, the control module 25 is then placed in the housing 20, and then the cover plate 18 is attached to the housing 20 to close the opening 20A. This completes the assembly of the energy storage element unit 10.

In this embodiment, the energy storage element module kit 30 and the energy storage element unit 10 include an energy storage element module 40, a first handle member 35A attached to the energy storage element module 40, and a second handle member 35B attached to the energy storage element module 40. Therefore, as shown in FIG. 5, the energy storage element module 40 can be carried by grasping the first handle member 35A and the second handle member 35B attached to the energy storage element module 40.

In particular, according to this embodiment, as shown in Figures 6 and 7, the first handle member 35A is swingable relative to the energy storage element module 40 when attached to the energy storage element module 40. Furthermore, the second handle member 35B is swingable relative to the energy storage element module 40 when attached to the energy storage element module 40.

As a specific example of enabling swinging, the connecting portion 62 of the case main body 50 may include a curved surface 62s that contacts the hook 37. As shown in FIGS. 10 and 15 , the curved surface 62s is formed by the first connecting portion 62a and has an arc shape when observed in the X direction DX. More specifically, the curved surface 62s may have an arc shape, particularly a semicircular arc shape, that protrudes toward the second side in the Z direction DZ when observed in the X direction DX. With this configuration, when an operator holding the grip portion 36 lifts the energy storage element module 40 using the first and second handle members 35A, 35B, the handle members 35A, 35B can be smoothly swung relative to the energy storage element module 40.

By attaching the first and second handle members 35A, 35B to the energy storage element module 40 in a swingable manner, the grip portions 36 of the first and second handle members 35A, 35B can be moved to an appropriate position depending on the physique of the worker, or the worker's working condition and working posture. For example, the grip portions 36 of the first and second handle members 35A, 35B can be moved to an appropriate position depending on the width of the worker's shoulders. This allows the energy storage element module 40 to be carried stably via the first and second handle members 35A, 35B, improving the ease of handling when carrying the energy storage element module 40.

In particular, when placing the energy storage element module 40 inside the housing 20 through the opening 20A that opens vertically upward in the housing 20, or when removing the energy storage element module 40 from inside the housing 20 through the opening 20A that opens vertically upward, by gripping the gripping portions 36 of the first and second handle members 35A, 35B, the handleability of the energy storage element module 40 when carrying it can be improved. Furthermore, when assembling the energy storage element unit 10 in a situation where it is difficult to secure sufficient working space, for example, when assembling the energy storage element unit 10 at the installation location of the energy storage element unit 10, the handleability of the energy storage element module 40 can be improved.

Since the handling of the energy storage element module 40 when transporting it is improved, the energy storage element unit 10 can be easily assembled at the installation site. This eliminates the burden of transporting a large and heavy energy storage element unit 10 and installing it at the installation site. Therefore, this embodiment can be said to be suitable for large-capacity energy storage element units 10 that can be large and heavy.

In a specific example of the above-described embodiment, as shown in FIG. 6, the first handle member 35A may be swingable on the side away from the second handle member 35B when attached to the energy storage element module 40. The second handle member 35B may be swingable on the side away from the first handle member 35A when attached to the energy storage element module 40.

In Figure 6, the first handle member 35A, indicated by the two-dot chain line, is attached to the energy storage element module 40 and extends along the Z direction DZ to a first side in the Z direction DZ. The position of the energy storage element module 40 indicated by the two-dot chain line in Figure 6 is the reference position. "The first handle member 35A can swing away from the second handle member 35B" means that it can swing away from the second handle member 35B relative to the reference position. Similarly, "The second handle member 35B can swing away from the first handle member 35A" means that it can swing away from the first handle member 35A relative to the reference position.

In FIG. 6, the first handle member 35A, shown in solid lines, is pivoted from the reference position, shown in dashed-dot lines, toward the second side in the Y direction DY relative to the energy storage element module 40. The first handle member 35A, shown in solid lines, is positioned at a position tilted furthest toward the second side in the Y direction DY within its pivotable range. In other words, the first handle member 35A, shown in solid lines, is in a state where it has pivoted to the maximum extent possible from the reference position, away from the second handle member 35B (not shown). Although not shown, the second handle member 35B can pivot symmetrically with the first handle member 35A, around a plane that passes through the centers of the first handle member 35A and the second handle member 35B attached to the energy storage element module 40 and is perpendicular to the Y direction DY.

According to this specific example, even if the first and second handle members 35A, 35B are attached to the energy storage element module 40 in close proximity to each other, the first and second handle members 35A, 35B can be swung relative to the energy storage element module 40 so that the gripping portions 36 are spaced apart. In other words, even if the shape of the energy storage element module 40 restricts the distance between the two connecting portions 62 on each side wall portion 52A, 52B in the Y direction DY from being set long, the pair of gripping portions 36 can be moved sufficiently apart by swinging the first and second handle members 35A, 35B. This improves the ease of handling when carrying the energy storage element module 40. Furthermore, the energy storage element module kit 30, which includes the first and second handle members 35A, 35B attached to the energy storage element module 40, can be prevented from becoming too large. As a result, the energy storage element module 40, which has improved handling, can be placed inside the housing 20 through an opening 20A of limited dimensions, and can be removed from inside the housing 20 through an opening 20A of limited dimensions.

In the specific example of the embodiment described above, for the first handle member 35A attached to the energy storage element module 40, the outer pivotable angular range θX (see FIG. 6) on the side away from the second handle member 35B may be greater than the inner pivotable angular range θY (see FIG. 7) on the side approaching the second handle member 35B. For the second handle member 35B attached to the energy storage element module 40, the outer pivotable angular range on the side away from the first handle member 35A may be greater than the inner pivotable angular range on the side approaching the first handle member 35A.

Figure 6 shows the outer pivotable angular range θX. In Figure 7, the first handle member 35A in the reference position is shown by a two-dot chain line. In Figure 7, the first handle member 35A, shown by a solid line, has pivoted from the reference position shown by the two-dot chain line to the first side in the Y direction DY relative to the energy storage element module 40. The first handle member 35A, shown by a solid line, is positioned at a position tilted most toward the first side in the Y direction DY within its pivotable range. In other words, the first handle member 35A, shown by a solid line, is in a state where it has pivoted to the maximum extent relative to the reference position, toward the second handle member 35B (not shown). Therefore, Figure 7 shows the inner pivotable angular range θY. Although the second handle member 35B is not shown, it can pivot symmetrically with the first handle member 35A, centered on a plane that passes through the centers of the first handle member 35A and the second handle member 35B attached to the energy storage element module 40 and is perpendicular to the Y direction DY.

According to this specific example, even if the first and second handle members 35A, 35B are attached to the energy storage element module 40 in positions close to each other, the first and second handle members 35A, 35B can be swung relative to the energy storage element module 40 so that the gripping portions 36 move away from each other. This improves ease of handling when carrying the energy storage element module 40. At the same time, the range in which the first and second handle members 35A, 35B can be swung inward toward each other is restricted. By appropriately restricting the range in which the first and second handle members 35A, 35B can be swung, the first and second handle members 35A, 35B can be easily handled. Furthermore, by restricting the swinging of the first and second handle members 35A, 35B toward each other, it is possible to prevent wiring and the like from becoming pinched between the first and second handle members 35A, 35B.

In order to achieve the above-mentioned effects, the outer swingable angle range θX is preferably 35° to 75°, and more preferably 45° to 65°. The inner swingable angle range θY is preferably 0° to 35°, and more preferably 5° to 25°.

In the illustrated example, the hook-shaped portion 37X of the handle member 35 is wider in the region including the protruding end 37b than in the region including the hook tip 37a. When one first handle member 35 attempts to swing toward the other handle member 35, the hook-shaped portion 37X advances into the second opening 65. In the illustrated example, the hook-shaped portion 37X fits into the second opening 65, restricting the swinging of one first handle member 35 toward the other handle member 35. However, the configuration that determines the swingable range of the handle member 35 is not particularly limited, and a configuration different from the illustrated example may be adopted.

In the specific example of the embodiment described above, the first handle member 35A attached to the energy storage element module 40 housed in the housing 20 can be swung within a range that does not contact the housing 20. The second handle member attached to the energy storage element module 40 housed in the housing 20 can be swung within a range that does not contact the housing. Furthermore, the first and second handle members 35A, 35B attached to the energy storage element module 40 may be located inside the outer contour of the energy storage element module 40 when observed from the Z direction DZ, in any swing position.

According to this specific example, when the energy storage element module 40 is moved into or out of the housing 20 using the first and second handle members 35A, 35B, the first and second handle members 35A, 35B and the hands of the worker holding the first and second handle members 35A, 35B can be prevented from coming into contact with the housing 20. In other words, by appropriately limiting the range of swingability of the first and second handle members 35A, 35B, the ease of handling when carrying the energy storage element module 40 can be further improved. In addition, the first and second handle members 35A, 35B attached to the energy storage element module 40 housed within the housing 20 can be prevented from swinging relative to the energy storage element module 40 and coming into contact with the housing 20, which could damage the housing 20, or pinching wiring or the like between the handle members and the housing 20.

In the specific example of the embodiment described above, the case body 50 includes a first protrusion 53A located away from the swing center CX of the first handle member 35A. The first handle member 35A comes into contact with the first protrusion 53A, thereby restricting its swing away from the second handle member 35B. The case body 50 includes a second protrusion 53B located away from the swing center of the second handle member 35B. The second handle member 35B comes into contact with the second protrusion 53B, thereby restricting its swing away from the first handle member 35A.

In this specific example, the first protrusion 53A is provided at a distance from the first handle member 35A. Therefore, when the first handle member 35A is in contact with the first protrusion 53A, a gap G can be formed between the first handle member 35A and the energy storage element module 40. By forming the gap G, it is possible to prevent wiring and the like from being pinched between the first handle member 35A and the energy storage element module 40 and being damaged. Similarly, by forming a gap between the second handle member 35B and the energy storage element module 40, it is possible to prevent wiring and the like from being pinched between the second handle member 35B and the energy storage element module 40 and being damaged.

In the specific example of the embodiment described above, the center of gravity of the energy storage element module 40 is located between the swing center CX of the first handle member 35A and the swing center CY of the second handle member 35B in the direction connecting the swing center CX of the first handle member 35A and the swing center CY of the second handle member 35B (the Y direction DY in the illustrated example). In other words, the center of gravity of the energy storage element module 40 is located between the first handle member 35A and the second handle member 35B attached to the energy storage element module 40. Therefore, by using the first and second handle members 35A, 35B, the weight of the energy storage element module 40 can be shared and supported. This allows the energy storage element module to be carried stably.

In the specific example of the embodiment described above, the first handle member 35A and the second handle member 35B are attached to the energy storage element module 40 at positions spaced apart from each other in the Y direction DY, which is the longitudinal direction of the energy storage element module 40. Therefore, the two handle members 35 can be effectively used to stably carry the energy storage element module 40, which has a longitudinal direction. Furthermore, the pivot center CX of the first handle member 35A and the pivot center CY of the second handle member 35B extend in the X direction DX, which is perpendicular to the longitudinal direction of the energy storage element module 40. This configuration allows the two handle members 35 to support the weight of the energy storage element module 40, which has a longitudinal direction, in a substantially equal manner. This further improves ease of handling when carrying the energy storage element module 40.

In the embodiment described above, the energy storage element module kit and energy storage element unit include an energy storage element module, a first handle member attached to the energy storage element module, and a second handle member attached to the energy storage element module. The first handle member 35A, when attached to the energy storage element module 40, is swingable relative to the energy storage element module 40. The second handle member 35B, when attached to the energy storage element module 40, is swingable relative to the energy storage element module 40. This improves ease of handling when carrying the energy storage element module 40.

One embodiment has been described with reference to the illustrated specific example, but the illustrated specific example is not intended to limit the embodiment. The above-described embodiment can be implemented in various other specific examples, and various omissions, substitutions, modifications, and additions can be made without departing from the spirit of the invention. For example, in the above-described specific example, the connecting portion 62 is provided on the outer side in the Y direction DY relative to the opening 61, i.e., on the side away from the side wall center line WL, but this is not limited to this. The connecting portion 62 may also be provided on the inner side in the Y direction DY relative to the opening 61, i.e., on the side closer to the side wall center line WL.

10: Energy storage element unit, 15: Storage box, 15S: Internal space, 18: Cover plate portion, 20: Housing, 20A: Opening, 21: Bottom wall portion, 22: Side wall portion, 22A: First side wall portion, 22B: Second side wall portion, 22C: Third side wall portion, 22D: Fourth side wall portion, 25: Control module, 28: Stopper, 28A: First stopper, 28B: Second stopper, 30: Energy storage element module kit , 35: Handle member, 35A: First handle member, 35B: Second handle member, 36: Grip portion, 36a: Base portion, 36b: Extension portion, 36c: Through hole, 37: Hook, 37X: Hook-shaped portion, 37a: Hook tip portion, 37b: Protruding end portion, 40: Energy storage element module, 41: Cell, 41c: Central portion, 41e: Peripheral portion, 42: Exterior body, 45: Case, 46: End cover, 47: end cover, 50: case body, 51: bottom, 52: side wall, 52A: first side wall, 52B: second side wall, 52C: third side wall, 52D: fourth side wall, 53: protrusion, 53A: first protrusion, 53B: second protrusion, 54: receiving portion, 60a: main wall, 60b: outer wall, 60e: receiving portion, 61: opening, 61a: opening edge, 62: connecting portion, 6 2a: first connecting portion, 62b: second connecting portion, 62s: curved surface, 63a: first partition wall, 63b: second partition wall, 64: rib, 65: second opening, 65a: opening edge, 66: side opening, 66a: opening edge, 70: case lid, 71: cover body, 72: fixing portion, DX: X direction, DY: Y direction, DZ: Z direction, D1: first direction, D2: second direction, D3: third direction, G: gap

Claims (10)

a power storage element module;
a first handle member detachably attached to the energy storage element module;
a second handle member detachably attached to the energy storage element module,
the energy storage element module includes a plurality of cells and a case body having an internal space for accommodating the plurality of cells;
The case body has a bottom and a side wall that define the internal space,
The side wall portion has a main wall portion and an outer wall portion facing each other, and a connecting portion connecting the main wall portion and the outer wall portion,
the first handle member and the second handle member each have a hook that is inserted into a space between the main wall portion and the outer wall portion and hooked onto the connecting portion;
The space within the side wall portion where the hook is located is divided by the interior space and the main wall portion,
The energy storage element module kit, wherein the first handle member and the second handle member are swingable relative to the energy storage element module when attached to the energy storage element module. the first handle member is swingable on a side away from the second handle member when attached to the energy storage element module,
The energy storage element module kit according to claim 1 , wherein the second handle member is swingable on a side away from the first handle member when attached to the energy storage element module. a swingable angle range on a side away from the second handle member of the first handle member when the first handle member is attached to the energy storage element module is larger than a swingable angle range on a side approaching the second handle member,
3. The energy storage element module kit according to claim 1, wherein the second handle member, when attached to the energy storage element module, has a larger swingable angle range on the side away from the first handle member than on the side approaching the first handle member. the first handle member attached to the energy storage element module housed in a housing can swing within a range where it does not come into contact with the housing,
The energy storage element module kit according to any one of claims 1 to 3, wherein the second handle member attached to the energy storage element module housed in the housing is capable of swinging within a range that does not contact the housing. the energy storage element module includes a first protrusion provided at a position away from a swing center of the first handle member,
The first handle member is restricted from swinging away from the second handle member by contacting the first protrusion,
the energy storage element module includes a second protrusion provided at a position away from a swing center of the second handle member,
The energy storage element module kit according to any one of claims 1 to 4, wherein the second handle member is restricted from swinging away from the first handle member by contacting the second protrusion. The energy storage element module kit according to any one of claims 1 to 5, wherein the center of gravity of the energy storage element module is located between the swing center of the first handle member and the swing center of the second handle member. the first handle member and the second handle member are attached to the energy storage element module at positions spaced apart from each other in the longitudinal direction of the energy storage element module;
The energy storage element module kit according to any one of claims 1 to 6, wherein the pivot center of the first handle member and the pivot center of the second handle member are perpendicular to the longitudinal direction of the energy storage element module. The energy storage element module kit according to any one of claims 1 to 7,
a housing that houses the energy storage element module. A building equipped with the energy storage element unit described in claim 8. a step of attaching the first handle member and the second handle member of the energy storage element module kit according to any one of claims 1 to 7 to the energy storage element module of the energy storage element module kit;
and a step of gripping the first handle member and the second handle member and placing the energy storage element module in a housing.