Energy storage element unit, building and storage box

Abstract

To provide a power storage element unit with earthquake resistance.SOLUTION: A power storage element unit has a housing having a plurality of wall sections and a plurality of power storage element modules stored in the housing, each of the wall sections consists of a single layer consisting of either a resin plate or a metal plate, or a laminate consisting of a resin plate and a metal plate, the resin plate has a thickness of 3 mm or less, the metal plate has a thickness of 2 mm or less, and is resistant to vibration of 2200 Gal or less.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an energy storage element unit, a building, and a storage box. [Background technology]

[0002] For example, an energy storage element unit having a plurality of energy storage element modules is known, as disclosed in Patent Document 1. The energy storage element unit includes a plurality of energy storage element modules and a storage box for storing the energy storage element modules. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-5027 Summary of the Invention [Problem to be solved by the invention]

[0004] On the other hand, there has been a demand for an electric storage element unit that is earthquake-resistant.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide an energy storage element unit that is earthquake-resistant. [Means for solving the problem]

[0006] The energy storage element unit according to the present disclosure comprises: a storage box having a plurality of walls; a plurality of energy storage element modules housed in the housing box, each of the wall portions is formed from a single layer body made of either a resin plate or a metal plate, or a laminate body made of the resin plate and the metal plate; The resin plate has a thickness of 3 mm or less, and the metal plate has a thickness of 2 mm or less, Resistant to vibrations of up to 2200 Gal.

[0007] In the energy storage element unit according to the present disclosure, at least one of the plurality of wall portions is formed from a single layer body made of the resin plate or a laminate body made of the resin plate and the metal plate, At least one of the resin plates may be provided with a first rib that protrudes toward the inside or outside of the storage box.

[0008] In the energy storage element unit according to the present disclosure, The first rib may have a first rib surface that intersects with the inner or outer surface of the resin plate, and the first rib surface may form an angle greater than 90 degrees with the inner or outer surface of the resin plate.

[0009] In the energy storage element unit according to the present disclosure, the wall portion is formed of a laminated body including the resin plate and the metal plate, The resin plate is provided with one of a through hole through which a shank of a screw is passed or a screw hole into which the shank passed through the through hole is screwed, and the metal plate is provided with the other of the through hole or the screw hole, The width of the through hole may be larger than the width of the shaft portion in a direction in which a long side of the wall portion in which the through hole and the screw hole are provided extends.

[0010] In the energy storage element unit according to the present disclosure, at least one of the plurality of wall portions is formed from a single layer body made of the metal plate or a laminate body made of the resin plate and the metal plate, At least one of the metal plates has a flat body portion and a bent portion bent relative to the body portion, The corner formed by the main body portion and the bent portion may be rounded.

[0011] In the energy storage element unit according to the present disclosure, One of the plurality of wall portions has one edge portion, and another wall portion adjacent to the one wall portion has another edge portion adjacent to the one edge portion, The one edge portion and the other edge portion are connected via a frame portion having an L-shaped cross section, The frame portion may be made of a metal material having a thickness of 2 mm or less.

[0012] In the energy storage element unit according to the present disclosure, Each of the energy storage element modules includes a plurality of cells and a case that houses the plurality of cells, Each of the cases may be made of a resin material with a thickness of 3 mm or less.

[0013] In the energy storage element unit according to the present disclosure, At least one of the cases may be provided with a second rib that protrudes toward the outside or the inside of the case.

[0014] In the energy storage element unit according to the present disclosure, The second rib may have a second rib surface that intersects with the inner or outer surface of the case, and the second rib surface may form an angle greater than 90 degrees with the inner or outer surface of the case.

[0015] A building according to the present disclosure includes the above-described energy storage element unit.

[0016] The storage box according to the present disclosure comprises: A storage box for storing a plurality of energy storage element modules, a plurality of walls; each of the wall portions is formed from a single layer body made of either a resin plate or a metal plate, or a laminate body made of the resin plate and the metal plate; The resin plate has a thickness of 3 mm or less, and the metal plate has a thickness of 2 mm or less, With the plurality of energy storage element modules housed inside, the housing is resistant to vibrations of 2200 Gal or less. [Effects of the Invention]

[0017] According to the present disclosure, it is possible to provide an energy storage element unit that is earthquake-resistant. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a diagram for explaining one embodiment, and is a perspective view showing an energy storage element unit. [Figure 2] FIG. 2 is a perspective view showing the inside of the energy storage element unit of FIG. [Figure 3] 3 is a perspective view showing an upper wall portion of the storage box of the energy storage element unit of FIG. [Figure 4] 4 is a perspective view showing a storage box for the energy storage element unit of FIG. 1. FIG. [Figure 5] FIG. 5 is a cross-sectional view of the upper wall portion taken along line AA in FIG. [Figure 6] FIG. 6 is a perspective view showing the resin plate of the upper wall portion of FIG. [Figure 7] 7 is a perspective view showing the metal plate of the upper wall portion of FIG. [Figure 8] FIG. 8 is a partial cross-sectional view showing an enlarged portion of the cross-sectional view of FIG. [Figure 9] 9 is a perspective view showing an energy storage element module assembly and an energy storage element module arranged in a storage box for the energy storage element unit of FIG. [Figure 10] 10 is a perspective view showing an energy storage element module included in the energy storage element module assembly of FIG. [Figure 11] FIG. 11 is a perspective view showing a plurality of stacked cells included in the energy storage element module of FIG. [Figure 12] FIG. 12 is a perspective view showing one cell shown in FIG. [Figure 13] FIG. 13 is a perspective view showing the energy storage element module of FIG. 10 with the cover removed from the case body. [Figure 14] 14 is a perspective view showing a cover of a case of the energy storage element module of FIG. [Figure 15] 15 is an enlarged partial cross-sectional view showing a part of the cross section taken along line BB in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an example of an embodiment of an energy storage element unit according to the present disclosure will be described in detail with reference to FIGS.

[0020] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Note that in the drawings accompanying this specification, the scale and aspect ratios have been appropriately changed and exaggerated from those of the actual objects for the sake of ease of illustration and understanding.

[0021] 1 to 15 are diagrams illustrating an embodiment of the present disclosure. Of these, Fig. 1 is a perspective view showing an energy storage element unit 10, and Fig. 2 is a perspective view showing the interior of the energy storage element unit 10. Note that Fig. 2 shows the energy storage element unit 10 in a state where an upper wall portion 13b and a decorative panel 19, which will be described later, have been removed. Also, in Fig. 2, a resin plate 91 is omitted from the illustration of a side wall portion 13c, which will be described later.

[0022] To clarify the directional relationships between the drawings, some drawings use arrows to indicate the first direction DA, the second direction DB, and the third direction DC, which are common to the drawings. The tips of the arrows correspond to one side SA1, SB2, and SC3 of each direction DA, DB, and DC. Arrows pointing perpendicular to the paper surface of the drawing and toward the inside of the paper are indicated by a symbol with an X inside a circle, as shown in FIG. 5 . Furthermore, in the drawings showing components (e.g., the energy storage element module assembly 15 and the energy storage element module 20) stored in the storage box 11, the directions and orientations of the components stored in the storage box 11 are shown. Similarly, in the drawings showing components (e.g., the cell 30 and the case 18, which will be described later) included in the energy storage element module 20, the directions and orientations of the components assembled in the energy storage element module 20 stored in the storage box 11 are shown.

[0023] In the illustrated example, the first direction DA, the second direction DB, and the third direction DC are perpendicular to one another. The first direction DA is parallel to the vertical direction. One side SA1 in the first direction DA is the lower side in the vertical direction, and the other side opposite to the one side in the first direction DA is the upper side in the vertical direction.

[0024] 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, and is electrically connected to the building's wiring to function as a power source for electrical devices installed within the building.

[0025] As shown in FIGS. 1 and 2, the energy storage element unit 10 includes a storage box 11, a control module 14 and a plurality of energy storage element modules 20 housed in the storage box 11.

[0026] First, we will explain the storage box 11. The storage box 11 has a plurality of walls 13, and the walls 13 form an arrangement space for the control module 14 and the energy storage element modules 20. In the example shown in Fig. 2, the storage box 11 further has a frame portion 12 that connects adjacent walls 12 to each other. The walls 13 close off the arrangement space for the control module 14 and the energy storage element modules 20.

[0027] In the example shown in FIG. 1 , the storage box 11 has a generally rectangular parallelepiped shape and includes walls 13, which are a bottom wall 13a, an upper wall 13b, and four side walls 13c. The bottom wall 13a is a generally rectangular, plate-like wall 13 located on one side SA1 in the first direction DA. The upper wall 13b is a generally rectangular, plate-like wall 13 facing the bottom wall 13a in the first direction DA. The bottom wall 13a and the upper wall 13b each have a pair of long sides 131 extending in the third direction DC and a pair of short sides 132 extending in the second direction DB perpendicular to the third direction DC. The four side walls 13c are generally rectangular, plate-like wall 13 connected to an edge located on one side of the bottom wall 13a and an edge located on one side of the upper wall 13b, respectively.

[0028] 2, each of the multiple wall portions 13 is an independent member that is generally plate-shaped overall. The edges of each of the multiple wall portions 13 are connected to the edges of adjacent other wall portions 13 directly or via frame portions 12, which will be described later. The connections between the edges of the multiple wall portions 13 form a storage box 11 that has a storage space for storing multiple energy storage element modules 20.

[0029] The structure of the wall portion 13 will be described. Fig. 3 is a perspective view showing the upper wall portion 13b as viewed from the inside of the storage box 11 (one side SA1 in the first direction DA, i.e., the lower side in Fig. 2). Fig. 4 is a view showing the wall portions 13 of the storage box 11 excluding the upper wall portion 13b and one of the side wall portions 13c (the side wall portion 13c located on the opposite side from one side SB1 in the second direction DB), and the frame portion 12 connecting the wall portions 13 to each other. Note that in Fig. 4, a resin plate 91 is not shown for the side wall portion 13c, which will be described later.

[0030] Each of the wall portions 13 is formed from a single layer made of either a resin plate 91 or a metal plate 92, which will be described later, or a laminated body made of a resin plate 91 and a metal plate 92. That is, each of the wall portions 13 may be a single layer made of a resin plate 91, a single layer made of a metal plate 92, or a laminated body made of a resin plate 91 and a metal plate 92.

[0031] 3 and 4, a case will be described in which the bottom wall portion 13a, the top wall portion 13b, and the four side wall portions 13c are all laminated bodies made up of a resin plate 91 and a metal plate 92. Note that, unless contradictory, the explanations regarding the resin plate 91 and the metal plate 92 making up the laminated body described in this specification also apply to the resin plate 91 in a single-layer body made up of the resin plate 91 and the metal plate 92 in a single-layer body made up of the metal plate 92.

[0032] The structure of the wall portion 13 will be described in more detail using the upper wall portion 13b as an example. Fig. 5 is a cross-sectional view of the upper wall portion 13b taken along line AA in Fig. 3. Note that in Fig. 5, the upper wall portion 13b is inverted in its up-down orientation from that in Fig. 3, with the side facing upward in Fig. 3 facing downward and the side facing downward facing upward. In the example shown in Figs. 3 and 5, the upper wall portion 13b is a laminated body made up of a resin plate 91 and a metal plate 92 located more inward in the storage box 11 than the resin plate 91.

[0033] Fig. 6 is a perspective view showing a resin plate 91 included in the upper wall portion 13b. In the example shown in Fig. 6, the resin plate 91 has a generally plate-like shape. The resin plate 91 has a flat resin plate main body portion 91a and a peripheral portion 91b provided around the resin plate main body portion 91a and forming an angle with respect to the resin plate main body portion 91a. In the example shown in Fig. 6, the resin plate main body portion 91a and the peripheral portion 91b are perpendicular to each other.

[0034] The resin plate 91 may be provided with a first rib 93 protruding from the resin plate 91, as in the resin plate 91 of the upper wall portion 13b shown in Fig. 6. The first rib 93 is provided, for example, on at least one of the resin plates 91 of the multiple wall portions 13 of the storage box 11. The first rib 93 is also provided on the resin plate 91 so as to protrude toward the inside or outside of the storage box 11, in other words, so as to protrude in the first direction DA. In the example shown in Fig. 6, the first rib 93 is provided so as to protrude toward the inside of the storage box 11. In the examples shown in Figs. 4 and 5, the first rib 93 protruding inward is provided on all of the resin plates 91 of the multiple wall portions 13 of the storage box 11.

[0035] 6, the first rib 93 has a lattice shape having a portion extending in the second direction DB and a portion extending in the third direction DC. In addition, as an example, the first rib 93 is made of a resin material and is provided integrally with the resin plate 91.

[0036] By providing first rib 93 on resin plate 91, the strength of resin plate 91 is improved, and the strength of storage box 11 and further energy storage element unit 10 is improved, thereby improving earthquake resistance.

[0037] As an example, the first rib 93 has a first rib surface 93a that intersects with the inner surface 911 or the outer surface 912 of the resin plate 91, and the first rib surface 93a forms an angle greater than 90 degrees with the inner surface 911 or the outer surface 912 of the resin plate 91. In the example shown in FIG. 5 , the first rib 93 is provided on the inner surface 911 of the resin plate 91. In this case, the first rib surface 93a is a surface that intersects with the inner surface 911 of the resin plate 91. The angle θ1 formed between the first rib surface 93a and the inner surface 911 of the resin plate 91 is greater than 90 degrees. Although not shown, if the first rib 93 is provided on the outer surface 912 of the resin plate 91, the first rib surface 93a is a surface that intersects with the outer surface 912 of the resin plate 91, and the angle formed between the first rib surface 93a and the outer surface 912 of the resin plate 91 is greater than 90 degrees. As an example, the angle formed between the first rib surface 93a and the outer surface 912 of the resin plate 91 is 120 degrees or less.

[0038] The following effect is obtained by forming an angle greater than 90 degrees between the first rib surface 93a and the inner surface 911 or the outer surface 912 of the resin plate 91. When a force that tends to deflect the resin plate 91 acts, the force that deflects the resin plate 91 is less likely to concentrate between the first rib surface 93a and the inner surface 911 or the outer surface 912 of the resin plate 91 than when the angle between the first rib surface 93a and the inner surface 911 or the outer surface 912 of the resin plate 91 is 90 degrees or less. This further improves the strength of the resin plate 91, the strength of the storage box 11, and further improves the strength of the energy storage element unit 10, and thus the earthquake resistance.

[0039] As shown in FIG. 6, the resin plate 91 included in the upper wall portion 13b has a resin plate main body 91a provided with through holes 94, which will be described later, used for fastening to the metal plate 92 with screws.

[0040] Next, the metal plate 92 will be described. FIG. 7 is a perspective view showing the metal plate 92 included in the upper wall portion 13b. At least one of the metal plates 92 of the multiple wall portions 13 of the storage box 11 has a flat main body portion 92a and a bent portion 92b bent relative to the main body portion 92a, as in the metal plate 92 included in the upper wall portion 13b shown in FIG. 7. A corner 92c formed by the main body portion 92a and the bent portion 92b is rounded. In the example shown in FIG. 7, in the metal plate 92 included in the upper wall portion 13b, the corner 92c formed by the main body portion 92a and the bent portion 92b is rounded. In the example shown in FIG. 4, the metal plate 92 included in the bottom wall portion 13a also has a main body portion 92a and a bent portion 92b. In this case, although not shown, a corner 92c formed by the main body 92a and the bent portion 92b of the metal plate 92 included in the bottom wall 13a is also rounded. The corner 92c being rounded means that the corner 92c has a bending radius (outer bending radius) of 0.5 mm or more in a cross section perpendicular to the main body 92a and the bent portion 92b.

[0041] By rounding the corners 92c, when an impact is applied to the storage box 11 and the corners 92c of the metal plate 92 come into contact with other members, damage caused by the corners 92c to the other members can be reduced.

[0042] Furthermore, the metal plate 92 may have a connecting portion 92d that includes an upstanding portion 92e that stands up from the main body portion 92a and a portion that is connected to the resin plate 91, as in the metal plate 92 included in the upper wall portion 13b shown in FIG. 7. In the example shown in FIG. 7, the metal plate 92 has a plurality of connecting portions 92d, each of which includes a flat upstanding portion 92e that is parallel to the first direction DA and the second direction DB and extends in the second direction DB. The upstanding portions 92e of the plurality of connecting portions 92d face each other in the third direction DC. In the example shown in FIG. 7, the metal plate 92 has two connecting portions 92d.

[0043] In the example shown in FIG. 7 , the connecting portion 92d is connected to the end of the upright portion 92e on the side where the main body portion 92a is located, and further includes a flat first connecting portion 92f parallel to the main body portion 92a. The connecting portion 92d is connected to the main body portion 92a at the first connecting portion 92f. The first connecting portion 92f of the connecting portion 92d and the main body portion 92a are connected by, for example, welding, riveting, or burring. In the example shown in FIG. 7 , the connecting portion 92d is connected to the end of the upright portion 92e opposite the side where the main body portion 92a is located, and further includes a flat second connecting portion 92g parallel to the resin plate main body portion 91a. The second connecting portion 92g of the connecting portion 92d is the portion that is connected to the resin plate main body portion 91a of the resin plate 91. In the example shown in FIG. 7, the second connecting portion 92g is provided with a screw hole 95, which will be described later, used for fastening to the resin plate 91 with a screw.

[0044] The connecting portion 92d can be made of the same metal material as the metal material that makes up the main body portion 92a and the bent portion 92b. The connecting portion 92d may be formed, for example, by folding a flat metal material. The thickness of the connecting portion 92d, specifically the thickness of each of the upright portion 92e, the first connecting portion 92f, and the second connecting portion 92g included in the connecting portion 92d, is, for example, 2 mm or less, similar to the thickness of the metal plate 92 described below.

[0045] Since the metal plate 92 has the connecting portion 92d including the standing portion 92e, the resin plate 91 and the metal plate 92 can be fixed to each other by providing the first rib 93 on the inner surface 911 of the resin plate 91 and facing the metal plate 92 to the inner surface 911 of the resin plate 91. This makes it possible to form a laminate constituted by the resin plate 91 and the metal plate 92 as shown in Figs.

[0046] 3 and 5, the upright portion 92e of the connecting portion 92d extends in the second direction DB, that is, in the extension direction of the short side 132 of the upper wall portion 13b, which is the wall portion 13 including the metal plate 92 having the connecting portion 92d. The multiple upright portions 92e face each other in the third direction DC, that is, in the extension direction of the long side 131 of the upper wall portion 13b, which is the wall portion 13 including the metal plate 92 having the connecting portion 92d. This provides the following effects.

[0047] Because the resin plate 91 and the metal plate 92 have different thermal expansion coefficients, there is a risk that misalignment will occur between the resin plate 91 and the metal plate 92, which are fixed to each other, due to temperature changes. It is also possible that misalignment will occur between the resin plate 91 and the metal plate 92 due to distortion of the resin plate 91 and the metal plate 92 caused by the application of external force. In such cases, it is thought that the misalignment between the resin plate 91 and the metal plate 92 will be greater in the extension direction of the long side 131 than in the extension direction of the short side 132 of the wall portion 13. In response to this, the multiple upright portions 92e extend in the extension direction of the short side 132 and face each other in the extension direction of the long side 131, so that the upright portions 92e can accommodate misalignment that occurs in the extension direction of the long side 131 by bending. This more effectively prevents damage to the wall portion 13 due to misalignment between the resin plate 91 and the metal plate 92.

[0048] In addition, when the metal plate 92 and the resin plate 91 form a laminate, the metal plate 92 does not need to have the connecting portion 92d. In this case, the resin plate main body 91a of the resin plate 91 and the main body 92a of the metal plate 92 may be in contact with each other in the laminate.

[0049] 3 and 5, when the wall portion 13 is a laminated body composed of a resin plate 91 and a metal plate 92, the resin plate 91 and the metal plate 92 are fixed to each other directly or indirectly via another member to form a laminated body. When the resin plate 91 and the metal plate 92 are indirectly connected via another member, the other member may be made of, for example, the same material as the resin plate 91, i.e., a flat resin material having a thickness of 3 mm or less. Alternatively, the other member may be made of the same material as the metal plate 92, i.e., a flat metal material having a thickness of 2 mm or less.

[0050] As an example, a case will be described in which a resin plate 91 and a metal plate 92 are fixed to each other using a screw 96, as in the upper wall portion 13b shown in Figures 3 and 5. The screw 96 has a head 96b and a shaft 96a extending from the head 96b. In this case, the resin plate 91 is provided with either a through hole 94 through which the shaft 96a of the screw 96 is passed or a screw hole 95 into which the shaft 96a passed through the through hole 94 is screwed. In addition, the metal plate 92 is provided with the other of the through hole 94 or the screw hole 95, which is different from the one provided in the resin plate 91.

[0051] 3 and 5, as described above, the through hole 94 is provided in the resin plate main body 91a of the resin plate 91, and the screw hole 95 is provided in the second connection portion 92g of the coupling portion 92d of the metal plate 92. As a result, the through hole 94 and the screw hole 95 are overlapped, and the shank 96a of the screw 96 is screwed into the screw hole 95 through the through hole 94, thereby fixing the resin plate 91 and the metal plate 92 to each other.

[0052] Fig. 8 is an enlarged view of the periphery of the through hole 94 and the screw hole 95 in the cross-sectional view of Fig. 5. In the example shown in Fig. 8, the width w1 of the through hole 94 is larger than the width w2 of the shaft portion 96a in the direction in which the long side 131 of the wall portion 13 in which the through hole 94 and the screw hole 95 are provided extends (third direction DC in Fig. 8). The width w1 is, for example, 1.05 to 1.5 times the width w2. By making the width w1 larger than the width w2, the following effects are obtained.

[0053] Because the resin plate 91 and the metal plate 92 have different thermal expansion coefficients, there is a risk that misalignment will occur between the resin plate 91 and the metal plate 92, which are fixed to each other, due to temperature changes. It is also possible that the resin plate 91 and the metal plate 92 will be distorted by the application of external force, causing misalignment between the resin plate 91 and the metal plate 92. In such cases, the width w1 of the through hole 94 is larger than the width w2 of the shaft portion 96a in the direction in which the long side 131 of the wall portion 13 extends. This allows the shaft portion 96a to move inside the through hole 94 and accommodate any misalignment that occurs in the direction in which the long side 131 extends. Therefore, damage to the wall portion 13 due to misalignment between the resin plate 91 and the metal plate 92 can be more effectively prevented.

[0054] In the present embodiment, the width of the through hole 94 in the radial direction DD of the through hole 94 perpendicular to the direction in which the through hole 94 extends (first direction DA in FIG. 8 ) is greater than the width of the shaft portion 96a in the radial direction DD. This allows the shaft portion 96a to move inside the through hole 94, thereby accommodating misalignment between the resin plate 91 and the metal plate 92 not only in the direction in which the long side 131 of the wall portion 13 extends but also in the radial direction DD.

[0055] Furthermore, an accommodating recess 97 may be provided on the surface of one of the resin plate 91 and the metal plate 92, on which the through hole 94 is provided, opposite the surface facing the other plate. The accommodating recess 97 is a recess that connects to the through hole 94 at the bottom and accommodates the head 96b of the screw 96. In the example shown in FIG. 8 , the accommodating recess 97 is provided on the surface of the second connecting portion 92g of the metal plate 92, opposite the surface facing the resin plate main body 91a of the resin plate 91. In the example shown in FIG. 8 , the minimum width w3 of the accommodating recess 97 is larger than the maximum width w4 of the head 96b in the direction in which the long side 131 of the wall portion 13, on which the through hole 94 and the screw hole 95 are provided, extends. By making the width w3 larger than the width w4, the head 96b can be accommodated in the accommodating recess 97, while the shaft 96a can move within the through hole 94 to accommodate misalignment between the resin plate 91 and the metal plate 92 in the direction in which the long side 131 extends. The width w3 is, for example, 1.05 times or more and 1.5 times or less the width w4.

[0056] 3 and 5, an example of fixing the resin plate 91 and the metal plate 92 to each other has been described. However, the resin plate 91 and the metal plate 92 of each of the side wall portion 13c and the bottom wall portion 13a can also be fixed to each other by a similar method. For example, a portion of the resin plate 91 of the side wall portion 13c, such as the resin plate main body portion 91a, may also be provided with a through hole 94 and a storage recess 97 similar to those described above for the top wall portion 13b. Furthermore, a portion of the metal plate 92 of the side wall portion 13c, such as the main body portion 92a, may also be provided with a screw hole 95 similar to those described above for the top wall portion 13b. This allows the same effect as that described above for the top wall portion 13b to be obtained for the side wall portion 13c.

[0057] In the present embodiment, the minimum width of the accommodating recess 97 in the radial direction DD is greater than the maximum width of the head 96b in the radial direction DD. This allows the shaft 96a to move in the through-hole 94 not only in the direction in which the long side 131 of the wall 13 extends, but also in the radial direction DD while the head 96b is accommodated in the accommodating recess 97.

[0058] The method for fixing the resin plate 91 and the metal plate 92 to each other is not limited to a method using screws. For example, the resin plate 91 and the metal plate 92 may be fixed to each other by a pin having one end that fits into a hole provided in the resin plate 91 and the other end that fits into a hole provided in the metal plate 92. Alternatively, one of the resin plate 91 and the metal plate 92 may have a recess, and the other may have a protrusion that fits into the recess of the other, and the recess of one may fit into the protrusion of the other, thereby fixing the resin plate 91 and the metal plate 92 to each other.

[0059] The resin plate 91 has a thickness of 3 mm or less, and the metal plate 92 has a thickness of 2 mm or less. Here, the thickness of the resin plate 91 refers to the thickness of the resin plate main body 91a, and does not include the thickness of the first rib 93 if the resin plate 91 has a first rib 93, or the thickness of components provided on the resin plate main body 91a to fix the resin plate 91 and the metal plate 92 to each other. Furthermore, the thickness of the metal plate 92 refers to the thickness of the main body 92a, and does not include the thickness of the connecting portion 92d if the main body 92a has a connecting portion 92d, or the thickness of components provided on the main body 92a to fix the resin plate 91 and the metal plate 92 to each other.

[0060] Next, the frame portion 12 will be described. The frame portion 12 is a member that connects adjacent wall portions 13 to each other. In FIG. 4, the frame portion 12 forms the sides of the storage box 11, which has a substantially rectangular parallelepiped shape. In the example shown in FIG. 4, one of the multiple wall portions 13 has one edge, and another wall portion 13 adjacent to the one wall portion 13 has another edge that is close to the one edge. The frame portion 12 has an L-shaped cross section, and the one edge and the other edge are connected via the frame portion 12 that also has an L-shaped cross section. In the example shown in FIG. 4, the frame portion 12 has a flat first portion 121 and a flat second portion 122 that is perpendicular to the first portion 121 and connected to the first portion 121, thereby forming an L-shaped cross section. The one edge portion is connected to one of the first portion 121 and the second portion 122, and the other edge portion is connected to the other of the first portion 121 and the second portion 122, thereby connecting adjacent wall portions 13 to each other.

[0061] In this embodiment, as shown in Fig. 4, the frame portion 12 connects the top wall portion 13b to each of the four side wall portions 13c, and also connects adjacent ones of the four side wall portions 13c. In the example shown in Fig. 4, the frame portion 12 has a rectangular frame-shaped first frame portion 12a extending between the top wall portion 13b and the four side wall portions 13c, and four rod-shaped second frame portions 12b extending between adjacent ones of the four side wall portions 13c. The first frame portion 12a and each of the four second frame portions 12b are fixed to each other at the corner positions of the top wall portion 13b.

[0062] 4, no frame 12 is provided between the bottom wall 13a and each of the four side walls 13c. In the example shown in Fig. 4, the metal plate 92 of the bottom wall 13a has a bent portion 92b, and the bottom wall 13a and each of the four side walls 13c are fixed to each other using the bent portion 92b of the metal plate 92 of the bottom wall 13a. In other words, each of the four side walls 13c is fixed to the bent portion 92b of the metal plate 92 of the bottom wall 13a.

[0063] The frame portion 12 can be made of a metal material having a thickness of 2 mm or less. The frame portion 12 is made of, for example, the same metal material as the material of the metal plate 92.

[0064] The portion of the frame portion 12 that is bent to form an L-shaped cross section, in other words the portion where the first portion 121 and the second portion 122 are connected, may be rounded, similar to the corner 92c of the metal plate 92 of the wall portion 13.

[0065] The storage box 11 may have a decorative panel 19 or decorative cover that covers one side wall portion 13c. The decorative panel 19 is a member that protects the one side wall portion 13c and the components provided on the one side wall portion 13c. In the example shown in FIG. 1, the storage box 11 has a decorative panel 19 that covers one side wall portion 13c. In the example shown in FIG. 1, the decorative panel 19 has a generally plate-like shape. The decorative panel 19 can be made of a resin material with a thickness of 3 mm or less, for example, similar to the material of the resin plate 91.

[0066] For example, when the storage box 11 includes flat resin materials other than the resin plates 91 included in the wall portions 13, the thickness of all of the resin materials may be 3 mm or less. Also, when the storage box 11 includes flat metal materials other than the metal plates 92 included in the wall portions 13, the thickness of all of the metal materials may be 2 mm or less.

[0067] Next, the control module 14 will be described. The control module 14 has, for example, one or more of the functions of controlling the charging and discharging of the multiple energy storage element modules 20, monitoring the charging states (e.g., charge amounts) of the energy storage element modules 20, and monitoring the presence or absence of abnormalities in the energy storage element modules 20. The control module 14 may also be configured to transmit information such as the monitoring results of the charging states and the presence or absence of abnormalities of the energy storage element modules 20 to a control device installed outside the energy storage element unit 10. The control module 14 may also have 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 20.

[0068] Fig. 9 is a diagram showing a state in which a plurality of energy storage element modules 20 are stored in a storage box 11. As shown in Fig. 9, the energy storage element unit 10 has two energy storage element module assemblies 15. The energy storage element module assemblies 15 have a plurality of energy storage element modules 20 stacked in a first direction DA. The two energy storage element module assemblies 15 are arranged side by side in a second direction DB that is non-parallel to the first direction DA.

[0069] In the illustrated example, the first energy storage element module assembly 15A has three energy storage element modules 20 stacked in the first direction DA. The second energy storage element module assembly 15B is adjacent to the first energy storage element module assembly 15A from one side SB1 in the second direction DB. As shown in FIG. 2, the second energy storage element module assembly 15B supports the control module 14 from one side SA1 in the first direction DA. FIG. 10 shows one energy storage element module 20 included in the energy storage element module assembly 15. The multiple energy storage element modules 20 included in the energy storage element unit 10 may have different configurations or may have the same configuration. However, from the perspective of improving versatility, it is preferable that the multiple energy storage element modules 20 have the same configuration and preferably include at least the same components (e.g., cells 30 and cases 18 described below). In the illustrated example, the multiple energy storage element modules 20 have the same configuration.

[0070] Each energy storage element module 20 has a plurality of cells 30 and a case 18 that houses the plurality of cells 30. The cell 30 is the smallest unit that can be used as an energy storage element. Various types of cells 30 can be employed, and for example, a lithium-ion secondary battery can be used. FIG. 11 shows the plurality of cells 30 included in one energy storage element module 20, and FIG. 12 shows one cell 30. The plurality of cells 30 included in one energy storage element module 20 may have the same configuration as each other, or may have different configurations from each other.

[0071] As shown in FIGS. 11 and 12 , the cell 30 has a flat shape. The cell 30 has a substantially rectangular shape in a plan view (observed from the first direction DA). The cell 30 has a short side in the second direction DB and a long side in the third direction DC. The plurality of cells 30 are stacked in a stacking direction. In the illustrated example, the stacking direction of the cells 30 is parallel to the first direction DA. The cell 30 has a central portion 31C located in the center and a peripheral portion 31E surrounding the central portion 31C. The thickness of the central portion 31C is greater than the thickness of the peripheral portion 31E. In the illustrated example, the central portion 31C of the cell 30 bulges out toward either side in the first direction DA. The plurality of cells 30 are stacked such that the central portions 31C at least partially face each other in the first direction DA. 12 includes a plurality of electrode plates 32 including positive and negative electrode plates, an exterior body 33 that houses the plurality of electrode plates 32, and tabs 35 that are electrically connected to the electrode plates 32 and extend to the outside of the exterior body 33. The cell 30 includes a pair of tabs 35. The pair of tabs 35 function as a positive electrode terminal or a negative electrode terminal, respectively.

[0072] The cell 30 has a generally symmetrical configuration with respect to a reference plane that is a plane extending along the first direction DA and the third direction DC and that passes through the center in the second direction DB. The cell 30 also has a generally symmetrical configuration with respect to a reference plane that is a plane extending along the first direction DA and the second direction DB and that passes through the center in the third direction DC.

[0073] The many cells 30 included in one energy storage element module 20 are electrically connected to one another through series or parallel connections by electrically connecting their tabs 35 to one another. The tabs 35 of the many cells 30 are electrically connected to one another using, for example, electrode members (not shown). By appropriately setting the number and connection of the cells 30 in series or parallel, the output from one cell 30 can be set to a desired voltage and capacity. In the illustrated example, one energy storage element module 20 includes 16 cells 30. In particular, in the example shown in FIG. 11, eight pairs of two parallel-connected cells 30 are connected in series.

[0074] The specific configuration of the energy storage element module 20 will be described in further detail. Here, Fig. 13 is a perspective view showing the energy storage element module 20 in a state where a cover 60 (described later) has been removed from a case main body 40 (described later). Fig. 14 is a perspective view showing the cover 60 as viewed from the opposite direction to the direction as viewed in Fig. 13.

[0075] As shown in Figures 10, 13, and 14, the energy storage element module 20 has a case 18 for storing multiple cells. The case 18 defines a storage space on its inner surface for storing the multiple cells. The case 18 has a case main body 40 and a cover 60. The cover 60 is detachable from the case main body 40. The energy storage element module 20 also has a first end cover 21 and a second end cover 22 fixed to the case main body 40.

[0076] The case body 40, which houses the multiple cells 30, has, as an overall configuration, a bottom 42 that supports the multiple cells 30 from one side SA1 in the first direction DA, and a case sidewall 44 that rises from the bottom 42 in the first direction DA. The case body 40 is open to the other side in the first direction DA. That is, the case body 40 has an opening 40a facing the bottom 42. The case sidewall 44 surrounds the cells 30 from the second direction DB and the third direction DC. More precisely, the case sidewall 44 surrounds the exterior body 33 of the cells 30 from the second direction DB and the third direction DC. When observed from the first direction DA, the case sidewall 44 extends along the outer edge of the exterior body 33 of the cells 30.

[0077] The case sidewalls 44 face the cells 30 in directions perpendicular to the first direction DA, such as the second direction DB and the third direction DC. The case sidewalls 44 restrict relative movement of the cells 30 with respect to the case body 40 in directions perpendicular to the first direction DA, such as the second direction DB and the third direction DC. This allows multiple cells 30 to be stably held within the case body 40. Meanwhile, the case body 40 has openings 40a in the first direction DA, which allow relative movement of the cells 30 with respect to the case body 40 in the first direction DA.

[0078] The cover 60 is held by the case body 40 so as to be movable in the first direction DA, and covers the opening 40a of the case body 40. The cover 60 covers the cell 30 housed in the case body 40 from the other side in the first direction DA. The cover 60 protects the cell 30 and also restricts free relative movement of the cell 30 with respect to the case body 40 to the other side in the first direction DA.

[0079] 13 and 14, the cover 60 has a cover main body 61 and a fixing portion 62 extending from the cover main body 61. The fixing portion 62 is engageable with a receiving portion 49 provided on the case side wall portion 44 of the case main body 40. The fixing portion 62 engages with the receiving portion 49, thereby holding the cover 60 in place by the case main body 40. In the example shown, the fixing portion 62 engages with the receiving portion 49 so as to be movable in the first direction DA.

[0080] 13 and 14, the cover 60 has fixing portions 62 at positions spaced apart in the second direction DB. The cover 60 also has fixing portions 62 at positions spaced apart in the third direction DC. The fixing portions 62 are provided at positions facing the case side wall 44 along the first direction DA. In the illustrated example, four fixing portions 62 are provided spaced apart on each portion of the case side wall 44 extending in the third direction DC. Therefore, in the illustrated example, eight fixing portions 62 are provided on one cover 60.

[0081] 13 and 14, the fixing portion 62 has an extending portion 62a extending from the cover main body 61 in the first direction DA and a claw portion (insertion portion) 62b protruding from the extending portion 62a in the second direction DB. The fixing portion 62 is molded integrally with the cover main body 61 as, for example, a resin molding, and is elastically deformable. In particular, the illustrated extending portion 62a is formed as a plate-like portion having a long side along the first direction DA and a short side along the third direction DC, and is easily flexurally deformed (bendingly deformed) about an axis along the third direction DC.

[0082] On the other hand, the receiving portions 49 are holes 49a formed in the case side wall portions 44. The holes 49a forming the receiving portions 49 have a width slightly wider than the width of the claw portions (insertion portions) 62b in the third direction DC (see FIG. 13). The holes 49a forming the receiving portions 49 also have a certain length in the first direction DA. The holes 49a forming the receiving portions 49 are formed corresponding to the respective fixing portions 62. That is, four receiving portions 49 are formed spaced apart in the third direction DC on each of the portions of the case side wall portions 44 extending in the third direction DC. Therefore, a total of eight receiving portions 49 are formed on the case side wall portions 44.

[0083] The illustrated case side wall 44 has a double-wall structure in the region on the other side in the first direction DA. As can be seen in FIG. 13 , the case side wall 44 includes a main wall 44a extending from the bottom 42 along the first direction DA and an outer wall 44b extending from the main wall 44a to the outside in the second direction DB, i.e., on the side away from the space that houses the cells 30 in the second direction DB. The outer wall 44b is provided only in the region on the other side in the first direction DA. As shown in FIG. 13 , the space between the main wall 44a and the outer wall 44b opens to the other side in the first direction DA. The hole 49a forming the receiving portion 49 is provided in the outer wall 44b of the case side wall 44.

[0084] By bending and flexing the extension portion 62a of the fixing portion 62, the claw portion (insertion portion) 62b can be inserted into the receiving portion 49. This allows the cover 60 to be held by the case main body 40. Then, by moving the claw portion (insertion portion) 62b in the first direction DA within the hole 49a, the cover 60 held by the case main body 40 can move in the first direction DA relative to the case main body 40.

[0085] The cover 60 can be removed from the case body 40 by, for example, pushing the claws 62b through the holes 49a to deflect the extensions 62a. The main wall 44a is provided on the inner side in the second direction DB of the main wall 44a in which the holes 49a are provided, i.e., on the side of the space that stores the cells 30 in the second direction DB. The presence of this main wall 44a effectively prevents the fixing portions 62 from coming into contact with the cells 30 when the extensions 62a are deflected. Therefore, it is possible to effectively avoid damaging the cells 30 with the fixing portions 62 when removing the cover 60 from the case body 40.

[0086] By allowing the cover 60 attached to the case body 40 to move in the first direction DA relative to the case body 40, variations in the thickness of the cells 30 can be accommodated. That is, multiple cells 30 can be stacked and stored in the case body 40 without adjusting the spacing using spacers or the like, and the cover 60 can be attached to the case body 40. Therefore, the thickness of the energy storage element module 20 can be reduced while the cells 30 are stably held and protected by the case body 40 and the cover 60. Furthermore, because there is no need to adjust the spacing using spacers or the like, the number of parts of the energy storage element module 20 can be reduced, simplifying the structure. Therefore, the manufacturing costs of the energy storage element module 20 and the energy storage element unit 10 can be reduced and productivity can be improved.

[0087] Unlike the illustrated example, the cover 60 may have a hole 49a that forms the receiving portion 49, and the case body 40 may have a claw portion (insertion portion) 62b that is inserted into the hole 49a and is movable in the first direction DA within the hole 49a. This example also makes it possible to move the cover 60 in the first direction DA relative to the case body 40 with a simple structure.

[0088] In the illustrated example, the receiving portion 49 is configured as a hole 49a. Therefore, the claw portion (insertion portion) 62b can only move within the hole 49a. That is, the movement of the cover 60 held by the case body 40 in the first direction DA relative to the case body 40 is restricted within a certain range. This makes it possible to prevent the cover 60 from coming off the case body 40.

[0089] The case body 40 and the cover 60 of each of the cases 18 included in the energy storage element unit 10 are formed using, for example, an insulating material. The cover 60 as a whole can be integrally molded from an insulating resin material. The case body 40 as a whole can be integrally molded from an insulating resin material.

[0090] As an example, each of the cases 18 included in the energy storage element unit 10 is made of a resin material. In the case 18 having a case body 40 and a cover 60 as shown in Fig. 13, the case body 40 and the cover 60 are made of a resin material. The resin material making up the case 18 is, for example, the same resin material as the material of the resin plate 91.

[0091] In addition, at least one of the cases 18 included in the energy storage element unit 10 is provided with a second rib 98 that protrudes toward the outside or inside of the case 18. In the present embodiment, the second rib 98 is provided on all of the cases 18 included in the energy storage element unit 10.

[0092] 13, a second rib 98 that protrudes toward the outside of the case 18 is provided on a surface of the case main body 40 of the case 18 that constitutes the outer surface 18b of the case 18. In the example shown in FIG. 13, the second rib 98 is provided on the case side wall portion 44 of the case main body 40. The second rib 98 provided on the case main body 40 has a lattice shape having a portion extending in the first direction DA and a portion extending in the third direction DC. As an example, the second rib 98 is made of a resin material and is provided integrally with the case main body 40 that is made of a resin material.

[0093] 14, a second rib 98 that protrudes toward the inside of the case 18 is provided on a surface of the cover 60 of the case 18 that constitutes the inner surface 18a of the case 18 (a surface located on one side SA1 in the first direction DA). In the example shown in FIG. 14, the second rib 98 provided on the cover 60 has a lattice shape having a portion extending in the second direction DB and a portion extending in the third direction DC. As an example, the second rib 98 is made of a resin material and is provided integrally with the cover 60 that is made of a resin material.

[0094] By providing the second rib 98 on the case 18, the strength of the case 18 can be improved, and the strength of the energy storage element unit 10 can be improved, thereby improving earthquake resistance.

[0095] FIG. 15 is an enlarged partial cross-sectional view of the cover 60 taken along line BB in FIG. 14 , showing a portion where the second rib 98 is provided. As shown in FIG. 15 , the second rib 98 has a second rib surface 98a that intersects with the inner surface 18a or the outer surface 18b of the case 18, and the second rib surface 98a forms an angle greater than 90 degrees with the inner surface 18a or the outer surface 18b of the case 18. In the example shown in FIG. 15 , the second rib 98 is provided on the inner surface 18a of the case 18. In this case, the second rib surface 98a intersects with the inner surface 18a of the case 18. The angle θ2 formed between the second rib surface 98a and the inner surface 18a of the case 18 is greater than 90 degrees. When the second rib 98 is provided on the outer surface 18b of the case 18, the second rib surface 98a becomes a surface that intersects with the outer surface 18b of the case 18, and the angle formed between the second rib surface 98a and the outer surface 18b of the case 18 is greater than 90 degrees. As an example, the angle formed between the second rib surface 98a and the outer surface 18b of the case 18 is 120 degrees or less.

[0096] The following effect is obtained by forming an angle greater than 90 degrees between the second rib surface 98a and the inner surface 18a or the outer surface 18b of the case 18. When a force that tends to deflect the case 18 acts, the force is less likely to concentrate between the second rib surface 98a and the inner surface 18a or the outer surface 18b of the case 18 than when the angle between the second rib surface 98a and the inner surface 18a or the outer surface 18b of the case 18 is 90 degrees or less. This further improves the strength of the case 18, further improves the strength of the energy storage element unit 10, and further improves earthquake resistance.

[0097] As an example, each of the cases 18 included in the energy storage element unit 10 is made of a resin material with a thickness of 3 mm or less. For example, in a case 18 having a case body 40 and a cover 60 as shown in Fig. 13, the thickness of the resin material constituting the case body 40 and the cover 60 is 3 mm or less.

[0098] Here, the thickness of the resin material constituting the case 18 refers to the thickness of the members constituting the wall surfaces of the case 18, such as the case body 40 and the cover 60, and does not include the thickness of the second rib 98 if the case 18 is provided with the second rib 98. Furthermore, if part or all of the case 18 has a double-wall structure, such as the case side wall 44 having a main wall portion 44a and an outer wall portion 44b shown in FIG. 13, the thickness refers to the thickness of each of the main wall portion 44a and the outer wall portion 44b that form the double-wall structure. In other words, "the case 18 is made of a resin material having a thickness of 3 mm or less" means that, if part or all of the case 18 has a double-wall structure, the thickness of each of the main wall portion 44a and the outer wall portion 44b that form the double-wall structure is 3 mm or less.

[0099] The first end cover 21 and the second end cover 22 are made of, for example, a resin material similar to the material of the resin plate 91. The thickness of the resin material making up the first end cover 21 and the second end cover 22 is, for example, 3 mm or less.

[0100] The energy storage element unit 10 according to this embodiment is resistant to vibrations of 2200 Gal or less. In other words, the storage box 11 according to this embodiment is resistant to vibrations of 2200 Gal or less when storing a plurality of energy storage element modules 20. Here, "resistant" means, for example, that the energy storage element unit 10 can operate normally even when exposed to vibrations of 2200 Gal or less. Alternatively, "resistant" may mean that the energy storage element unit 10 can operate normally and the appearance is not impaired even when exposed to vibrations of 2600 Gal or less.

[0101] As a result of extensive research, the present inventors have found that the ability of the energy storage element unit 10 to withstand vibrations of 2200 Gal or less is a criterion for assessing whether the energy storage element unit 10 has sufficient earthquake resistance in the environment in which it is normally used. They have also found that the energy storage element unit 10 including the storage box 11 with the wall portion 13 described above is resistant to vibrations of 2200 Gal or less. Based on the above, the present inventors have completed the present invention. Note that "Gal" is a unit of acceleration, and for example, vibrations of 2200 Gal or less are vibrations with a vibration acceleration of 2200 cm / s 2 The following vibrations are meant:

[0102] By making the energy storage element unit 10 resistant to vibrations of 2200 Gal or less, the energy storage element unit 10 becomes sufficiently strong against impacts, and in particular has sufficient earthquake resistance. This allows the energy storage element unit 10 to be used more stably for a long period of time. In particular, while allowing for more stable and long-term use, the frequency with which internal parts need to be replaced can be reduced. Note that, in order to particularly ensure sufficient earthquake resistance of the energy storage element unit 10, it is more preferable that the energy storage element unit 10 be resistant to vibrations of 2600 Gal or less.

[0103] The energy storage element unit 10 according to this embodiment has sufficient strength against impacts, particularly sufficient earthquake resistance, even when it has a large overall mass. The energy storage element unit 10 according to this embodiment has a mass of, for example, 190 kg or less. The energy storage element unit 10 according to this embodiment also has a mass of, for example, 100 kg or more, more specifically 120 kg or more, and even more specifically 150 kg or more.

[0104] As described above, one embodiment has been described with reference to specific examples, but the above-described specific examples are not intended to limit the embodiment. The above-described embodiment can be implemented with various other specific examples, and various omissions, substitutions, and modifications can be made without departing from the spirit of the embodiment. Modifications of this embodiment will be described below.

[0105] (Variation) In the above-described embodiment, an example has been described in which the walls 13 of the storage box 11 are each independent, approximately plate-shaped members connected to one another by the frame 12 or the like. However, the shape of the storage box 11 is not limited to this. For example, in a storage box 11 having a substantially rectangular parallelepiped shape, the bottom wall 13a and the four side walls 13c may be integrally formed. In this case, the storage box 11 may be opened and closed by attaching and detaching the top wall 13b to the integral body of the bottom wall 13a and the four side walls 13c.

[0106] The aspects of the present invention are not limited to the above-described embodiments, but include various modifications that may be conceived by those skilled in the art, and the effects of the present invention are not limited to the above-described contents. In other words, various additions, modifications, and partial deletions are possible within the scope of the conceptual idea and spirit of the present invention that can be derived from the contents defined in the claims and their equivalents. [Explanation of symbols]

[0107] 10. Energy storage element unit 11 Storage Box 12 Frame section 13 Wall 13a Bottom wall 13b Upper wall 13c Side wall part 14 Control Module 15 Energy storage element module assembly 18 cases 20 Energy storage element module 30 cells 40 Case body 60 Cover 91 Resin board 92 Metal plate 92a Main body 92b Folded part 92c Corner 92d Connecting part 93 First Rib 93a First rib surface 94 Through holes 95 screw holes 96 screws 96a Shaft 96b head 97 Storage recess 98 Second Rib 98a Second rib surface

Claims

1. a storage box having a plurality of walls; a plurality of energy storage element modules housed in the housing box, each of the wall portions is formed from a single layer body made of either a resin plate or a metal plate, or a laminate body made of the resin plate and the metal plate; The resin plate has a thickness of 3 mm or less, and the metal plate has a thickness of 2 mm or less, Resistant to vibrations of 2200 Gal or less, at least one of the plurality of wall portions is formed from a single layer body made of the resin plate or a laminate body made of the resin plate and the metal plate, At least one of the resin plates is provided with a first rib that protrudes toward the inside or the outside of the storage box, One of the plurality of wall portions has one edge portion, and another wall portion adjacent to the one wall portion has another edge portion adjacent to the one edge portion, The one edge portion and the other edge portion are connected via a frame portion having an L-shaped cross section, The energy storage element unit has a mass of 190 kg or less.

2. A storage box having a plurality of wall portions; a plurality of energy storage element modules housed in the housing box, each of the wall portions is formed from a single layer body made of either a resin plate or a metal plate, or a laminate body made of the resin plate and the metal plate; The resin plate has a thickness of 3 mm or less, and the metal plate has a thickness of 2 mm or less, at least one of the plurality of wall portions is formed from a single layer body made of the resin plate or a laminate body made of the resin plate and the metal plate, At least one of the resin plates is provided with a first rib that protrudes toward the inside or outside of the storage box.

3. The energy storage element unit of claim 1 or 2, wherein the first rib has a first rib surface that intersects with the inner or outer surface of the resin plate, and the first rib surface forms an angle greater than 90 degrees with the inner or outer surface of the resin plate.

4. the wall portion is formed of a laminated body including the resin plate and the metal plate, The resin plate is provided with one of a through hole through which a shank of a screw is passed or a screw hole into which the shank passed through the through hole is screwed, and the metal plate is provided with the other of the through hole or the screw hole, The energy storage element unit according to claim 1 , wherein the width of the through hole is larger than the width of the shaft portion in a direction in which the long side of the wall portion in which the through hole and the screw hole are provided extends.

5. at least one of the plurality of wall portions is formed from a single layer body made of the metal plate or a laminate body made of the resin plate and the metal plate, At least one of the metal plates has a flat body portion and a bent portion bent relative to the body portion, The energy storage element unit according to claim 1 , wherein a corner formed by the main body portion and the bent portion is rounded.

6. One of the plurality of wall portions has one edge portion, and another wall portion adjacent to the one wall portion has another edge portion adjacent to the one edge portion, The one edge portion and the other edge portion are connected via a frame portion having an L-shaped cross section, The energy storage element unit according to claim 1 , wherein the frame portion is made of a metal material and has a thickness of 2 mm or less.

7. Each of the energy storage element modules includes a plurality of cells and a case that houses the plurality of cells, The energy storage element unit according to claim 1 , wherein each of the cases is made of a resin material and has a thickness of 3 mm or less.

8. The energy storage element unit according to claim 7 , wherein at least one of the cases is provided with a second rib that protrudes toward the outside or the inside of the case.

9. The energy storage element unit according to claim 8, wherein the second rib has a second rib surface that intersects with the inner or outer surface of the case, and the second rib surface forms an angle greater than 90 degrees with the inner or outer surface of the case.

10. A building comprising the energy storage element unit according to any one of claims 1 to 9.

11. A storage box for storing a plurality of energy storage element modules, a plurality of walls; each of the wall portions is formed from a single layer body made of either a resin plate or a metal plate, or a laminate body made of the resin plate and the metal plate; the resin plate has a thickness of 3 mm or less, and the metal plate has a thickness of 2 mm or less; The storage device has resistance to vibrations of 2200 Gal or less when the plurality of energy storage element modules are housed therein, at least one of the plurality of wall portions is formed from a single layer body made of the resin plate or a laminate body made of the resin plate and the metal plate, At least one of the resin plates is provided with a first rib that protrudes toward the inside or the outside of the storage box, One of the plurality of wall portions has one edge portion, and another wall portion adjacent to the one wall portion has another edge portion adjacent to the one edge portion, The one edge portion and the other edge portion are connected via a frame portion having an L-shaped cross section, The storage box has a mass of 190 kg or less when the plurality of energy storage element modules are stored in the storage box.

12. A storage box for storing a plurality of energy storage element modules, a plurality of walls; each of the wall portions is formed from a single layer body made of either a resin plate or a metal plate, or a laminate body made of the resin plate and the metal plate; the resin plate has a thickness of 3 mm or less, and the metal plate has a thickness of 2 mm or less; at least one of the plurality of wall portions is formed from a single layer body made of the resin plate or a laminate body made of the resin plate and the metal plate, At least one of the resin plates is provided with a first rib that protrudes toward the inside or outside of the storage box.

Images