Energy storage facility and method for constructing the facility

Abstract

This electrical storage equipment comprises: an outer frame that is formed as a box having an opening at the top and is disposed in an embedding hole dug in the ground, the outer surface thereof being in close contact with the inner surface of the embedding hole; and a cubicle that comprises a box body capable of housing a plurality of batteries and is housed by being fit into the interior of the outer frame from the opening.

Description

[Technical field]

[0001] The present invention relates to an electricity storage facility and a method for constructing the electricity storage facility. [Background technology]

[0002] In recent years, there has been an increase in energy storage facilities that reuse batteries that were installed in electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and the like, and utilize these batteries, for example, as backup power sources in the event of a disaster.

[0003] Incidentally, since the lifespan of a battery is extended when it is used at a temperature close to room temperature (around 25°C), it is required to maintain the temperature inside the cubicle, which is the housing that houses the battery, at around room temperature.

[0004] However, in outdoor power storage equipment, the temperature inside the cubicle rises due to sunlight, outside temperature, and heat generated when the battery is charged and discharged. In particular, if the installation environment is in a hot climate, the temperature rise will be even greater. This temperature rise cannot be suppressed by simply circulating air with a ventilation fan. In addition, in cold climates where the outside temperature is below freezing, the battery will become cold, resulting in a shorter lifespan and reduced performance. For this reason, many outdoor power storage equipment are equipped with expensive air conditioning devices to cool and heat the cubicle.

[0005] Here, Patent Document 1 shows a battery supply station equipped with an underground charging station that can be used as a battery warehouse. Patent Document 2 shows an earthquake disaster storage structure constructed underground of a ground or parking lot, and describes that a power source battery that stores electricity collected from a solar panel board is housed in part of this earthquake disaster storage structure. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 6-48184 [Patent Document 2] Japanese Patent Application Publication No. 9-203239 Summary of the Invention [Problem to be solved by the invention]

[0007] If the battery is housed in an underground facility as in the techniques described in Patent Documents 1 and 2 above, the temperature rise of the battery due to solar radiation and outside air temperature can be suppressed to some extent.

[0008] However, simply storing the batteries in an underground facility makes it difficult to effectively dissipate the heat generated by the batteries during charging and discharging. This requires expensive air conditioning equipment to cool and heat the interior space of the underground facility housing the batteries, which increases equipment costs. In addition, the use of air conditioning equipment increases power consumption.

[0009] Therefore, an object of the present invention is to provide an electricity storage facility that can maintain a battery at an appropriate temperature to extend its life and maintain its performance while keeping costs down, and a method for constructing such an electricity storage facility. [Means for solving the problem]

[0010] The present invention comprises the following configurations. (1) An outer frame formed in a box shape having an opening at the top, which is placed in a burial hole excavated in the ground and has its outer surface in close contact with the inner surface of the burial hole; a cubicle that is a box capable of housing a plurality of batteries and is housed inside the outer frame through the opening; Equipped with Energy storage equipment. (2) Dig a burial hole in the ground; A box-shaped outer frame having an opening at the top is placed in the burial hole so that its outer surface is in close contact with the inner surface of the burial hole; a cubicle made of a box capable of accommodating a plurality of batteries is fitted into the outer frame through the opening to accommodate the cubicle; How to build an energy storage facility. Effect of the Invention

[0011] According to the present invention, it is possible to provide an electricity storage facility that can maintain a battery at an appropriate temperature while suppressing costs, thereby extending the battery life and maintaining performance, and a method for constructing such an electricity storage facility. [Brief description of the drawings]

[0012] [Figure 1] 2 is a schematic cross-sectional view of the ground on which the power storage facility according to the embodiment is installed. FIG. [Diagram 2] FIG. 11 is a schematic cross-sectional view of the electricity storage facility illustrating removal of a cubicle. [Diagram 3] FIG. 2 is a schematic cross-sectional view of the ground illustrating the excavation process. [Figure 4] This is a schematic cross-sectional view of the ground explaining the outer frame installation process. [Diagram 5] 10 is a schematic cross-sectional view of the ground illustrating a protrusion forming step. FIG. [Figure 6] 10 is a schematic side view of a side wall portion illustrating a method for forming a lateral protrusion on the side wall portion. FIG. [Figure 7] FIG. 11 is a schematic cross-sectional view of the ground illustrating the containment process. [Figure 8] FIG. 11 is a schematic cross-sectional view of the ground on which the power storage facility according to another embodiment is installed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view of ground G on which an electricity storage facility 100 according to this embodiment is installed. As shown in Fig. 1, the electricity storage facility 100 according to this embodiment is installed underground. The electricity storage facility 100 includes a cubicle 11 and an outer frame 13. The outer periphery of the cubicle 11, except for the upper end portion, is covered by the outer frame 13. The cubicle 11 accommodates a plurality of batteries 15 in its internal space S. In this example, five batteries 15A to 15E are accommodated.

[0014] The power storage facility 100 is a facility that makes secondary use (reuse) of a battery 15 that is mounted on, for example, an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV) that can be externally charged or externally powered.

[0015] The cubicle 11 is a box-shaped metallic housing. The cubicle 11 has a bottom panel 21, a side panel 23, and a top panel 25. The side panel 23 is a plate material that covers the periphery of the cubicle 11 between the bottom panel 21 and the top panel 25, and is provided with a door (not shown) on one part of the side panel that can be opened and closed for, for example, inserting and removing the battery 15 or for maintenance.

[0016] The battery 15 housed in the cubicle 11 is connected to an external power supply device or the like by a power line (not shown). A voltage sensor, a temperature sensor, and the like provided in the battery 15 are connected to an external battery control device by wiring such as a signal line. The battery 15 housed in the cubicle 11 is charged and discharged, and the voltage and temperature are monitored by detection signals from the voltage sensor and the temperature sensor.

[0017] A plurality of shelves 31 are provided inside the cubicle 11. These shelves 31 are arranged at intervals in the vertical direction. The battery 15 accommodated in the internal space S of the cubicle 11 is placed on the bottom plate 21 and each shelf 31. Thus, the batteries 15A to 15E are arranged in the internal space S of the cubicle 11 in order from the bottom. The battery 15A at the bottom is placed on the placement surface 21a consisting of the upper surface of the bottom plate 21 via an insulating heat conductive sheet 33, and this heat conductive sheet 33 allows good heat exchange between the battery 15A and the bottom plate 21. Similarly, the other batteries 15B to 15E are placed on the placement surface 31a consisting of the upper surface of the shelf 31 via an insulating heat conductive sheet 33, and the heat conductive sheet 33 allows good heat exchange between the batteries 15B to 15E and the shelf 31. The thermally conductive sheet 33 is a sheet made of a resin such as silicone, acrylic, or polyolefin, and it is preferable to use one whose thermal conductivity is enhanced by blending a filler such as ceramic or metal.

[0018] The shelf board 31 on which the batteries 15B to 15E are placed has a concave and convex shape formed on the underside thereof by forming a plurality of recesses 31b, which allows for good heat exchange between the shelf board 31 and the air in the internal space S of the cubicle 11.

[0019] Additionally, the cubicle 11 has a plurality of U-shaped retractable hooks 37 housed within its top panel 25. These hooks 37 are provided, for example, near the corners of the top panel 25 and can be pulled out to the upper surface of the top panel 25 as necessary.

[0020] The outer frame 13 is a metal box body, and is embedded in the ground G by being fitted from above into an embedment hole H formed in the ground G. This allows the outer surface of the outer frame 13 to be in close contact with the ground G. The outer frame 13 has a bottom wall portion 41, a side wall portion 43, and an opening portion 45 formed in an upper portion.

[0021] A plurality of downward projections 47 are formed on the outer surface of the bottom wall portion 41, and a plurality of lateral projections 49 are formed on the outer surface of the side wall portion 43. The downward projections 47 protrude downward from the bottom wall portion 41, and are embedded in the bottom surface of the burial hole H in the ground G. Similarly, the lateral projections 49 protrude laterally from the side wall portion 43, and are embedded in the inner surface of the burial hole H in the ground G. In this way, the outer frame 13, which is in close contact with the inner surface of the burial hole H in the ground G and has the downward projections 47 and lateral projections 49 embedded in the ground G, is capable of good heat exchange with the ground G.

[0022] The cubicle 11 can be inserted and removed from the outer frame 13 buried in the ground G through an opening 45 at the top. With the cubicle 11 housed in the outer frame 13, a shim plate 51 is inserted between the side panel 23 of the cubicle 11 and the side wall portion 43 of the outer frame 13. This shim plate 51 is made of a metal plate with excellent thermal conductivity, and fills the gap between the side panel 23 of the cubicle 11 and the side wall portion 43 of the outer frame 13.

[0023] The upper surface of the power storage equipment 100 is substantially flush with the ground. The upper surface of the power storage equipment 100 that is substantially flush with the ground is preferably covered with, for example, a waterproof sheet or waterproof artificial turf. This can prevent rainwater from entering the power storage equipment 100.

[0024] Furthermore, in the electricity storage facility 100, when performing maintenance on the cubicle 11 housing the battery 15, the cubicle 11 is removed from the outer frame 13. Specifically, as shown in FIG. 2, the hooks 37 housed in the top panel 25 of the cubicle 11 are pulled out upward. Then, a wire W suspended from a crane or forklift is hung on these hooks 37 and pulled upward. In this manner, the cubicle 11 is removed from the outer frame 13, and the battery 15 housed in the cubicle 11 can be easily maintained.

[0025] As described above, according to the power storage facility 100 according to this embodiment installed underground, the cubicle 11 housing the multiple batteries 15 is housed in the outer frame 13 installed in the burial hole H in the ground G. That is, the cubicle 11 housing the batteries 15 is arranged underground where there is less temperature change compared to the outside air. Therefore, even in extremely hot or cold areas, the batteries 15 can be maintained at an appropriate temperature to extend their life and maintain their performance.

[0026] In addition, since the outer surface of the outer frame 13 is in close contact with the inner surface of the burial hole H in the ground G and the cubicle 11 is fitted into the outer frame 13, heat from the battery 15 can be dissipated smoothly to the ground G via the cubicle 11 and the outer frame 13, compared to a case where a battery is simply housed in an underground space. This makes it possible to eliminate the need for an expensive air conditioning device that consumes power, thereby reducing costs.

[0027] Moreover, because it is installed underground, the scenery can be maintained in a better condition than if it were installed on the surface.

[0028] Moreover, the outer frame 13 has on its outer surface downward projections 47 and lateral projections 49 which are embedded in the inner surface of the burying hole H, and these downward projections 47 and lateral projections 49 are embedded in the inner surface of the burying hole H. Therefore, the contact area between the outer frame 13 and the ground G can be increased to ensure good contact, and heat exchange with the ground G can be further improved.

[0029] Furthermore, a thermally conductive sheet 33 is provided between the battery 15 and the mounting surfaces 21a, 31a, and heat from the battery 15 is smoothly transferred to the cubicle 11 via the thermally conductive sheet 33, thereby enhancing the heat dissipation effect of the battery 15.

[0030] Moreover, since the lower surface of the shelf board 31 on which the batteries 15B-15E are placed is formed in an uneven shape, the heat transferred from the batteries 15B-15E to the shelf board 31 can be effectively dissipated to the air within the cubicle 11. This can improve the heat dissipation effect of the batteries 15B-15E.

[0031] Furthermore, since the shim plate 51 is interposed between the outer frame 13 and the cubicle 11, the shim plate 51 can increase the efficiency of heat transfer between the outer frame 13 and the cubicle 11.

[0032] Next, a case where the power storage facility 100 having the above configuration is constructed will be described. Fig. 3 is a schematic cross-sectional view of the ground G illustrating the excavation process. Fig. 4 is a schematic cross-sectional view of the ground G illustrating the outer frame installation process. Fig. 5 is a schematic cross-sectional view of the ground G illustrating the protrusion forming process. Fig. 6 is a schematic side view of the side wall portion 43 illustrating how to form the lateral protrusions 49 on the side wall portion 43. Fig. 7 is a schematic cross-sectional view of the ground G illustrating the accommodation process.

[0033] (Drilling process) As shown in FIG. 3, the ground G on which the power storage equipment 100 is to be installed is excavated, and a burial hole H for accommodating the power storage equipment 100 is formed in the ground G.

[0034] (Outer frame installation process) As shown in FIG. 4, the outer frame 13 is embedded in a burial hole H formed in the ground G. At this time, the outer frame 13 having a flat side wall 43 and a bottom wall 41 having a plurality of downward projections 47 is embedded in the burial hole H. In this way, if the side wall 43 is flat, the outer frame 13 can be smoothly embedded in the burial hole H. When the outer frame 13 is embedded in the burial hole H, the plurality of downward projections 47 of the bottom wall 41 are inserted into the bottom surface of the burial hole H and are in close contact with it. Note that the downward projections 47 may be formed on the bottom wall 41 after the outer frame 13 is embedded in the burial hole H in a state where the downward projections 47 are not formed on the bottom wall 41. The method of forming the downward projections 47 can be the same as the method of forming the lateral projections 49 described later.

[0035] (Protrusion formation process) As shown in FIG. 5, a plurality of side projections 49 are formed on the side wall portion 43 of the outer frame 13 embedded in the burial hole H in the ground G.

[0036] 6, a protrusion forming roller 61 is used to form the side protrusions 49. This protrusion forming roller 61 is a roller that rotates about a horizontal shaft 63, and has a plurality of forming protrusions 65 formed on its outer periphery.

[0037] To form the lateral projections 49 on the side wall portion 43 using this projection forming roller 61, the projection forming roller 61 is pressed against the inner surface of the side wall portion 43 of the outer frame 13 embedded in the embedding hole H, while being moved from above to below along the side wall portion 43. Then, the projection forming roller 61 rotates about the horizontal shaft 63, and the side wall portion 43 is pushed outward and protruded by the forming projections 65 on the outer periphery of the projection forming roller 61. As a result, a plurality of lateral projections 49 are formed on the side wall portion 43. The lateral projections 49 thus formed are embedded into the inner surface of the embedding hole H and come into close contact with it.

[0038] (Cubicle accommodation process) As shown in Fig. 7, the cubicle 11 is hung from the wire W hung on the hook 37 and fitted from above into the inside of the outer frame 13 installed in the embedding hole H. When the cubicle 11 is fitted into the inside of the outer frame 13 in this manner, the bottom panel 21 of the cubicle 11 is brought into close contact with the bottom wall portion 41 of the outer frame 13. Here, the side panel 23 of the cubicle 11 and the side wall portion 43 of the outer frame 13 are spaced apart in order to accommodate the shim plate 51. The hook 37 pulled out to hang the cubicle 11 inside the outer frame 13 is pushed into the top panel 25 and stored therein.

[0039] After fitting the cubicle 11 into the outer frame 13, a shim plate 51 is inserted into the gap between the side panel 23 of the cubicle 11 and the side wall portion 43 of the outer frame 13, and the gap between the side panel 23 of the cubicle 11 and the side wall portion 43 of the outer frame 13 is filled with the shim plate 51 (see FIG. 1). Thereafter, the recessed portion D remaining in the upper edge portion of the side wall portion 43 of the outer frame 13 is filled with soil, so that the ground surface and the top surface of the cubicle 11 are made flush with each other.

[0040] Through the above steps, it is possible to construct the electricity storage facility 100 that can maintain the battery 15 within an appropriate temperature range and allow the battery 15 to perform efficiently.

[0041] Next, a power storage facility according to a modified example will be described. The same components as those in the energy storage facility 100 according to the above embodiment are denoted by the same reference numerals and will not be described.

[0042] FIG. 8 is a schematic cross-sectional view of the ground G on which the power storage facility 100A according to another embodiment is installed. As shown in Fig. 8, the energy storage facility 100A according to the modified example includes an outer frame 13A in which a downward protrusion 47A with a large protruding dimension is formed on a bottom wall portion 41. The outer frame 13A also has a plurality of lateral protrusions 49A extending in the up-down direction formed on a side wall portion 43. These lateral protrusions 49 are formed at intervals in the width direction of the side wall portion 43 (the direction perpendicular to the up-down direction).

[0043] In the energy storage equipment 100A according to this modification, when the energy storage equipment 100A is installed on the ground G, the outer frame 13A on which the downward projections 47A and the lateral projections 49A are formed in advance is embedded in an embedding hole H in the ground G.

[0044] At this time, since the lateral projections 49A of the side wall portions 43 are formed along the vertical direction, it is possible to prevent the lateral projections 49A from getting caught when the outer frame 13A is embedded in the embedding hole H, and construction can be carried out smoothly.

[0045] Furthermore, in the energy storage equipment 100A according to the modified example, the multiple downward projections 47 having large projection dimensions are inserted deeper into and in close contact with the bottom surface of the burying hole H. This increases the contact area of ​​the outer frame 13 with the ground G, enabling better heat exchange.

[0046] In the above embodiment, the case where five batteries 15 are accommodated is illustrated, but the number of batteries 15 accommodated in the cubicle 11 is not limited to five.

[0047] As such, the present invention is not limited to the above-described embodiments, and the present invention also contemplates mutual combinations of the various components of the embodiments, as well as modifications and applications by those skilled in the art based on the descriptions in the specification and well-known technologies, and these are included in the scope of protection sought.

[0048] As described above, the present specification discloses the following: (1) An outer frame formed in a box shape having an opening at the top, which is placed in a burial hole excavated in the ground and has its outer surface in close contact with the inner surface of the burial hole; a cubicle that is a box capable of housing a plurality of batteries and is housed inside the outer frame through the opening; An energy storage facility equipped with: According to this power storage facility, a cubicle housing multiple batteries is housed in an outer frame installed in a buried hole in the ground. In other words, the cubicle housing the batteries is placed underground where there is less temperature change compared to the outside air. Therefore, even in extremely hot or cold areas, the batteries can be kept at an appropriate temperature to extend their life and maintain their performance. In addition, because the cubicle is fitted into an outer frame whose outer surface is in close contact with the inner surface of the buried hole in the ground, heat from the battery can be dissipated smoothly into the ground through the cubicle and outer frame, compared to a case in which the battery is simply housed in an underground space. This makes it possible to eliminate the need for expensive, power-hungry air-conditioning equipment, thereby reducing costs. Moreover, because it is installed underground, the scenery can be maintained in a better condition than if it were installed on the surface.

[0049] (2) The energy storage facility according to (1), wherein the outer frame has a protrusion on its outer surface that is embedded into the inner surface of the burying hole. According to this energy storage facility, the protrusions of the outer frame are embedded in the inner surface of the burial hole, so that the contact area between the outer frame and the ground can be increased and good contact can be achieved, thereby further improving heat exchange with the ground.

[0050] (3) The cubicle has a mounting surface on which the battery is mounted, The power storage facility according to (1) or (2), further comprising a thermally conductive sheet provided between the battery and the placement surface. According to this power storage facility, heat from the battery is smoothly transferred to the cubicle via the thermally conductive sheet, thereby improving the heat dissipation effect of the battery.

[0051] (4) The cubicle has a shelf board whose upper surface serves as the mounting surface on which the battery is placed, The storage battery facility according to (3), wherein a portion of an outer surface of the shelf is formed in an uneven shape. According to this power storage facility, the heat transferred from the battery to the shelf board can be efficiently dissipated into the air within the cubicle, thereby improving the heat dissipation effect of the battery.

[0052] (5) The electricity storage facility according to any one of (1) to (4), wherein a shim plate is interposed between the outer frame and the cubicle. According to this electricity storage facility, the efficiency of heat transfer between the outer frame and the cubicle can be increased by the shim plate interposed between the outer frame and the cubicle.

[0053] (6) The electricity storage facility according to any one of (1) to (5), wherein a retractable hook is provided on an upper portion of the cubicle. According to this power storage facility, since a wire from a crane or the like can be hung on the hook, the cubicle can be easily inserted and removed from the outer frame, which allows smooth maintenance work on the battery inside the cubicle.

[0054] (7) Dig a burial hole in the ground; A box-shaped outer frame having an opening at the top is placed in the burial hole so that its outer surface is in close contact with the inner surface of the burial hole; A method for constructing an electricity storage facility, comprising fitting a cubicle, which is a box capable of housing a plurality of batteries, into the interior of the outer frame through the opening. According to this method of constructing an energy storage facility, the cubicles that house the batteries are placed underground, where there is less temperature change compared to the outside air, making it easy to construct an energy storage facility that can maintain the batteries at an appropriate temperature, thereby extending their lifespan and improving their performance, even in extremely hot or cold areas.

[0055] (8) A method for constructing an energy storage facility as described in (7), comprising installing the outer frame having a flat side wall portion in the burial hole, and then pushing the side wall portion outward from the inner surface side of the side wall portion to form a protrusion. According to this method for constructing an electric storage facility, the outer frame can be smoothly installed in the burial hole while preventing the side wall from getting caught on the inner surface of the burial hole. After the outer frame is installed in the burial hole, the side wall is pushed outward from the inner surface side of the side wall to form a protrusion, thereby increasing the contact area between the outer frame and the ground, thereby achieving good contact and improving heat exchange with the ground.

[0056] (9) The method for constructing an energy storage facility according to (7) or (8), further comprising inserting a shim plate between the outer frame and the cubicle to fill a gap after the cubicle is housed in the outer frame. According to this method for constructing a power storage facility, by inserting a shim plate between the outer frame and the cubicle to fill the gap, it is possible to improve the efficiency of heat transfer between the outer frame and the cubicle. In addition, it is possible to eliminate rattling of the cubicle relative to the outer frame. [Explanation of symbols]

[0057] 11 Cubicle 13 Outer Frame 15,15A~15E Battery 21a, 31a Placement surface 31 Shelf 33 Thermal Conductive Sheet 37 Hook 45 Opening 47 Lower protrusion (protrusion) 49 Lateral process (protrusion) 51 Shim plate 100,100A power storage facility G. Ground H embedding hole

Claims

1. An outer frame formed in a box shape having an opening at the top, installed in a burial hole excavated in the ground, and having an outer surface in close contact with an inner surface of the burial hole; a cubicle that is a box capable of housing a plurality of batteries and is housed inside the outer frame through the opening; Equipped with the outer frame has a protrusion on its outer surface that is embedded in the inner surface of the embedding hole, The protrusions protrude downward from the bottom wall of the outer frame, are embedded in the bottom surface of the burial hole in the ground, and include a plurality of downward protrusions having a large protruding dimension. Energy storage equipment.

2. An outer frame formed in a box shape having an opening at the top, installed in a burial hole excavated in the ground, and having an outer surface in close contact with an inner surface of the burial hole; a cubicle that is a box capable of housing a plurality of batteries and is housed inside the outer frame through the opening; Equipped with the outer frame has a protrusion on its outer surface that is embedded in the inner surface of the embedding hole, The protrusions include a plurality of lateral protrusions that protrude laterally from the side wall portion of the outer frame, are embedded in the inner surface of the burial hole in the ground, and extend along the vertical direction. Energy storage equipment.

3. the cubicle has a mounting surface on which the battery is mounted, A thermally conductive sheet is provided between the battery and the placement surface. The power storage facility according to claim 1 or 2.

4. the cubicle has a shelf board whose upper surface serves as the placement surface on which the battery is placed, A part of the outer surface of the shelf board is formed in an uneven shape. The power storage facility according to claim 3.

5. A shim plate is interposed between the outer frame and the cubicle. The storage facility according to any one of claims 1 to 4.

6. A retractable hook is provided on the upper portion of the cubicle. The storage facility according to any one of claims 1 to 5.

7. A hole is excavated in the ground, A box-shaped outer frame having an opening at the top is placed in the burial hole so that its outer surface is in close contact with the inner surface of the burial hole; a cubicle configured as a box capable of accommodating a plurality of batteries is fitted into the outer frame through the opening, After the outer frame having a flat side wall portion is installed in the embedding hole, the side wall portion is pushed outward from an inner surface side of the side wall portion to form a protrusion; The protrusions protrude downward from the bottom wall of the outer frame, are embedded in the bottom surface of the burial hole in the ground, and include a plurality of downward protrusions having a large protruding dimension. How to build an energy storage facility.

8. A hole is excavated in the ground, A box-shaped outer frame having an opening at the top is placed in the burial hole so that its outer surface is in close contact with the inner surface of the burial hole; a cubicle configured as a box capable of accommodating a plurality of batteries is fitted into the outer frame through the opening, After the outer frame having a flat side wall portion is installed in the embedding hole, the side wall portion is pushed outward from an inner surface side of the side wall portion to form a protrusion; The protrusions include a plurality of lateral protrusions that protrude laterally from the side wall portion of the outer frame, are embedded in the inner surface of the burial hole in the ground, and extend along the vertical direction. How to build an energy storage facility.

9. After the cubicle is housed in the outer frame, a shim plate is inserted between the outer frame and the cubicle to fill the gap. A method for constructing an electricity storage facility according to claim 7 or 8.

10. The plurality of side projections are formed at intervals in a direction perpendicular to the up-down direction of the side wall portion. The power storage facility according to claim 2.

11. The plurality of side projections are formed at intervals in a direction perpendicular to the up-down direction of the side wall portion. A method for constructing the power storage facility according to claim 8.

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