Restraints and energy storage devices

Abstract

The present invention provides an energy storage unit equipped with an energy storage module and a restraining device, wherein heat transfer between the restraining plate and the energy storage module is ensured. [Solution] The restraint device is a restraint device for restraining at least one energy storage module 2, and comprises a first restraint plate 10, a second restraint plate positioned at a distance from the first restraint plate 10 and on which the energy storage module 2 is positioned, a first elastic member 41 positioned between the first restraint plate 10 and the energy storage module 2, a second elastic member 42 positioned between the first elastic member 41 and the first restraint plate 10, and at least one heat conductive member 51 positioned between the first elastic member 41 and the second elastic member 42, wherein the thermal conductivity of the heat conductive member 51 is higher than that of the first elastic member 41, and the thermal conductivity of the heat conductive member 51 is higher than that of the second elastic member 42.

Description

Technical Field

[0001] The present disclosure relates to a restraint and a power storage device.

Background Art

[0002] Conventionally, various power storage devices have been proposed. For example, the power storage device described in Japanese Unexamined Patent Application Publication No. 2019-021513 includes a laminate and a restraint for restraining the laminate. The laminate includes a plurality of power storage modules and a cooler disposed between the power storage modules. The restraint includes a restraint plate provided on the upper surface of the laminate, a restraint plate provided on the lower surface of the laminate, and a connecting portion connecting the respective restraint plates. And an elastic body is disposed between each restraint plate and the laminate.

[0003] Also, as another power storage device, for example, a power storage device including a power storage module including a plurality of power storage cells and an elastic body disposed between the respective power storage cells is also known.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] This disclosure has been made in view of the above-mentioned problems, and its first objective is to provide an energy storage unit equipped with an energy storage module and a restraining device, in which heat transfer between the restraining plate and the energy storage module is ensured.

[0009] A second object of this disclosure is to provide an energy storage device that can suppress temperature differences between adjacent energy storage cells. [Means for solving the problem]

[0010] The restraint device is a restraint device for restraining at least one energy storage module, and comprises a first restraint plate, a second restraint plate positioned at a distance from the first restraint plate and on which the energy storage module is positioned, a first elastic member positioned between the first restraint plate and the energy storage module, a second elastic member positioned between the first elastic member and the first restraint plate, and at least one heat conductive member positioned between the first elastic member and the second elastic member, wherein the thermal conductivity of the heat conductive member is higher than that of the first elastic member, and the thermal conductivity of the heat conductive member is higher than that of the second elastic member. [Effects of the Invention]

[0011] According to the energy storage device described herein, in an energy storage unit equipped with an energy storage module and a restraining device, heat transfer between the restraining plate and the energy storage module can be ensured. [Brief explanation of the drawing]

[0012] [Figure 1] This is a perspective view showing the energy storage unit 1 according to this embodiment. [Figure 2] This is a cross-sectional view showing the energy storage module 2. [Figure 3] A cross-sectional view showing the elastic body unit 14 and its surroundings. [Figure 4] A cross-sectional view showing the elastic body unit 15 and its surrounding structure. [Figure 5] A flowchart showing a part of the manufacturing process of the power storage device. [Figure 6] A diagram showing the experimental results of heating each power storage module. [Figure 7] An enlarged view of the portion surrounded by the square in FIG. 6. [Figure 8] A diagram showing the experimental results of cooling each power storage module. [Figure 9] An enlarged view of the portion surrounded by the square in FIG. 8. [Figure 10] A cross-sectional view showing the power storage unit 1A according to Modification 1. [Figure 11] A cross-sectional view showing the power storage unit 1B according to Modification 2. [Figure 12] A cross-sectional view showing the power storage device 90. [Figure 13] A cross-sectional view showing the buffer member 94. [Figure 14] In the power storage device 90A, it is a cross-sectional view showing the buffer member 94A and its surrounding structure.

Mode for Carrying Out the Invention

[0013] Embodiments of the present disclosure will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are given the same numbers. (Embodiment 1) FIG. 1 is a perspective view showing the power storage unit 1 according to Embodiment 1 of the present invention. The power storage unit 1 includes a power storage module 2 and a restraint 3. In FIG. 1 and the like, "H" is the vertical direction H, "D1" is the first horizontal direction D1, and "D2" is the second horizontal direction D2 orthogonal to the first horizontal direction D1 and the vertical direction H.

[0014] The restraint device 3 includes a first restraint plate 10, a second restraint plate 11, a first connector 12, a second connector 13, and elastic body units 14, 15.

[0015] The first restraint plate 10 and the second restraint plate 11 are arranged at intervals in the vertical direction (separation direction) H. The first restraint plate 10 is arranged on the lower surface side of the restraint device 3. The second restraint plate 11 is arranged on the upper surface side of the restraint device 3.

[0016] The first restraint plate 10 includes a lower plate 20, an upper plate 21, and a plurality of beams 22. The lower plate 20 and the upper plate 21 are metal plates formed in a plate shape, and the lower plate 20 and the upper plate 21 are arranged at intervals in the vertical direction H. The plurality of beams 22 are arranged between the lower plate 20 and the upper plate 21. Each beam 22 is formed to extend in the first horizontal direction D1, and the plurality of beams 22 are arranged at intervals in the second horizontal direction D2. An elastic body unit 14 is arranged on the upper surface of the upper plate 21.

[0017] The second restraint plate 11 is configured in the same manner as the first restraint plate 10. The second restraint plate 11 includes a lower plate 23, an upper plate 24, and a plurality of beams 25.

[0018] The first connector 12 and the second connector 13 are provided to connect the first restraint plate 10 and the second restraint plate 11. The first connector 12 is arranged on one side in the first horizontal direction D1 in the restraint device 3. The second connector 13 is arranged on the other side in the first horizontal direction D1 in the restraint device 3.

[0019] The first connector 12 includes a lower support plate 30, an upper support plate 31, and a plurality of connecting shafts 32. The lower support plate 30 is arranged on the lower surface of the lower plate 20. The upper support plate 31 is arranged on the upper surface of the upper plate 21. And the plurality of connecting shafts 32 connect the lower support plate 30 and the upper support plate 31. The plurality of connecting shafts 32 are arranged at intervals in the second horizontal direction D2.

[0020] The second connector 13 is configured in the same way as the first connector 12. The second connector 13 includes a lower support plate 33, an upper support plate 34, and a plurality of connecting shafts. The lower support plate 33 is located on the lower surface of the lower plate 20, and the upper support plate 34 is located on the upper surface of the upper plate 21. The plurality of upper support plates are provided to connect the lower support plate 33 and the upper support plate 34.

[0021] Figure 2 is a cross-sectional view showing the energy storage module 2. The energy storage module 2 includes a plurality of energy storage cells 60 and a resin frame 61 that surrounds the outer periphery of the plurality of energy storage cells 60.

[0022] Specifically, the energy storage module 2 includes a plurality of current collector plates 62 arranged at intervals in the vertical direction H, a total current collector plate 68 provided on the lower surface of the energy storage module 2, and a total current collector plate 69 provided on the upper surface of the energy storage module 2.

[0023] A negative electrode active material 63 is formed on the upper surface of a current collector plate 62, and a separator 65 is placed on the upper surface of the negative electrode active material 63. A positive electrode active material layer 64 is placed on the upper surface of the separator 65. Another current collector plate 62 is placed on the upper surface of the positive electrode active material layer 64. In this way, a power storage cell 60 is formed between adjacent current collector plates 62 in the vertical direction H.

[0024] The current collector plate 62 includes an aluminum plate 66 and a copper plate 67. The aluminum plate 66 is positioned on the lower side of the current collector plate 62, and the copper plate 67 is positioned on the upper side of the current collector plate 62. A negative electrode active material 63 is formed on the upper surface of the copper plate 67, and a positive electrode active material layer 64 is formed on the lower surface of the aluminum plate 66.

[0025] Figure 3 is a cross-sectional view showing the elastic body unit 14 and its surroundings. The elastic body unit 14 includes a first elastic member 41, a second elastic member 42, a third elastic member 43, a first heat conductive member 51, and a second heat conductive member 52.

[0026] The first elastic member 41, the second elastic member 42, and the third elastic member 43 are positioned between the first restraint plate 10 and the energy storage module 2, and are arranged in the vertical direction H. Each elastic member is made of an elastically deformable resin, such as urethane or ethylene propylene rubber. The thickness of each of the first elastic member 41, the second elastic member 42, and the third elastic member 43 is, for example, between 1 mm and 20 mm.

[0027] The first elastic member 41 is positioned to be in contact with the energy storage module 2. The second elastic member 42 is positioned below the first elastic member 41. The third elastic member 43 is positioned between the second elastic member 42 and the first restraining plate 10. Each elastic member is formed in a plate shape.

[0028] The first elastic member 41 includes an upper main surface 44 and a lower main surface 45. The upper main surface 44 is in contact with the energy storage module 2. The lower main surface 45 is located on the side of the second elastic member 42.

[0029] The second elastic member 42 includes a first main surface 46 and a second main surface 47. The first main surface 46 faces the first elastic member 41, and the second main surface 47 faces the third elastic member 43.

[0030] The third elastic member 43 includes an upper main surface 48 and a lower main surface 49. The upper main surface 48 faces the second elastic member 42, and the lower main surface 49 faces the first restraint plate 10.

[0031] The first heat conductive member 51 is provided so as to cover the second elastic member 42. The first heat conductive member 51 covers the first main surface 46 and the second main surface 47. Specifically, the first heat conductive member 51 includes an upper covering portion 53, a lower covering portion 54, and side portions 55A and 55B. The upper covering portion 53 is provided on the first main surface 46, and the lower covering portion 54 is provided on the second main surface 47. The side portion 55A is provided on one side of the second elastic member 42 in the first horizontal direction D1, and the side portion 55B is provided on the other side.

[0032] The second heat conductive member 52 is provided so as to cover the third elastic member 43. The second heat conductive member 52 covers the upper main surface 48 and the lower main surface 49. Specifically, the second heat conductive member 52 includes an upper covering portion 56, a lower covering portion 57, and side portions 58A and 58B. The upper covering portion 56 is provided on the upper main surface 48, and the second main surface 47 is provided on the lower main surface 49. The side portion 58A is provided on one side of the third elastic member 43 in the first horizontal direction D1, and the side portion 58B is provided on the other side.

[0033] The first heat conduction member 51 and the second heat conduction member 52 are formed of, for example, aluminum. Therefore, the thermal conductivity of the first heat conduction member 51 is higher than that of the first elastic member 41 and higher than that of the second elastic member 42 and the third elastic member 43. Similarly, the thermal conductivity of the second heat conduction member 52 is higher than that of the first elastic member 41 and higher than that of the second elastic member 42 and the third elastic member 43.

[0034] Figure 4 is a cross-sectional view showing the elastic body unit 15 and its surrounding structure. Since the elastic body unit 15 is constructed similarly to the elastic body unit 14, a detailed explanation is omitted.

[0035] The elastic body unit 15 includes a fourth elastic member 71, a fifth elastic member 72, a sixth elastic member 73, a heat conductive member 74, and a heat conductive member 75. The fourth elastic member 71 is located on the upper surface of the energy storage module 2. The fifth elastic member 72 is located on the upper surface of the fourth elastic member 71. The sixth elastic member 73 is located between the upper surface of the fifth elastic member 72 and the second restraining plate 11.

[0036] The heat conductive member 74 is formed to enclose the fifth elastic member 72. The heat conductive member 75 is formed to enclose the sixth elastic member 73. The heat conductive members 74 and 75 are made of aluminum or the like.

[0037] Figure 5 is a flowchart showing part of the manufacturing process for the energy storage device. Note that the process shown in Figure 5 is carried out with the energy storage module 2 restrained by the restraint device 3.

[0038] The manufacturing process for the energy storage device includes an assembly process S1, a liquid injection process S2, an initial charging process S3, a heating process S4, a high-temperature aging process S5, and a cooling process S6.

[0039] Assembly process S1 is the process of assembling the energy storage unit 1 by restraining the energy storage module 2 with restraints 3. Liquid injection process S2 is the process of injecting electrolyte into each energy storage cell 60 through an injection port provided in the energy storage module 2.

[0040] The initial charging step S3 is a step of charging each energy storage cell 60 using terminals provided on the energy storage module 2. The heating step S4 is a step of heating the energy storage module 2 to raise its temperature. The high-temperature aging step S5 is a step of maintaining the energy storage module 2 in a high-temperature state to impregnate the negative electrode active material 63 and positive electrode active material layer 64 in each energy storage cell 60 with electrolyte and to promote various side reactions. The cooling step S6 is a step of cooling the energy storage module 2. An energy storage device can be manufactured by going through various steps including the above steps.

[0041] In the energy storage unit 1 according to this embodiment, an elastic body unit 14 is positioned between the energy storage module 2 and the first restraint plate 10 during assembly step S1, so that the restraining force of the first restraint plate 10 is applied evenly to the energy storage module 2. Similarly, an elastic body unit 15 is positioned between the energy storage module 2 and the second restraint plate 11, so that the restraining force of the second restraint plate 11 is applied evenly to the energy storage module 2.

[0042] This makes it possible to suppress variations in the distance between electrodes of the energy storage cell 60 due to planar position. This makes it possible to suppress problems such as variations in the charging reaction depending on the position in a large-area energy storage cell 60, for example, during the initial charging process S3.

[0043] In the energy storage unit 1 according to this embodiment, in the heating step S4, for example, the energy storage unit 1 is placed in a heating chamber or the like to heat the energy storage unit 1. At this time, as shown in Figure 1, the first restraining plate 10 and the second restraining plate 11 are made of metal, so their temperature rises more quickly than that of the energy storage module 2.

[0044] In Figure 3, the elastic body unit 14 of the restraint device 3 is provided with a first heat conduction member 51 and a second heat conduction member 52. Since the second heat conduction member 52 is in contact with the first restraint plate 10, heat from the first restraint plate 10 is efficiently transferred to the second heat conduction member 52. Furthermore, since the second heat conduction member 52 is in contact with the first heat conduction member 51, the heat transferred to the second heat conduction member 52 is transferred to the first heat conduction member 51.

[0045] The first heat conductive member 51 is in contact with the first elastic member 41, and the first elastic member 41 is in contact with the energy storage module 2. As a result, the heat absorbed by the first restraining plate 10 is effectively transferred to the energy storage module 2.

[0046] In Figure 3, the upper covering portion 53 of the first heat conductive member 51 is formed to cover the first main surface 46 of the second elastic member 42. Therefore, when heat is transferred from the first heat conductive member 51 to the first elastic member 41, it is possible to suppress differences in the amount of heat transferred to the first elastic member 41 depending on the position.

[0047] Furthermore, in Figure 4, the energy storage unit 1 includes a heat conductive member 74 and a heat conductive member 75. As a result, the heat absorbed by the second restraint plate 11 is efficiently transferred to the energy storage module 2.

[0048] As a result, the energy storage unit 1 can raise the temperature of the energy storage module 2 in a short amount of time.

[0049] Furthermore, in the cooling process S6, the energy storage unit 1 is stored in an atmosphere at room temperature. In this case, since the first restraint plate 10 and the second restraint plate 11 are made of metal, their temperature tends to be lower than that of the energy storage module 2.

[0050] In the energy storage unit 1, the heat from the energy storage module 2 is easily dissipated to the first restraint plate 10 through the first heat conduction member 51 and the second heat conduction member 52. In addition, the heat from the energy storage module 2 is easily dissipated to the second restraint plate 11 through the heat conduction members 74 and 75.

[0051] As a result, the energy storage unit 1 can cool the energy storage module 2 in a relatively short time during the cooling process S6.

[0052] The experimental results shown in Figures 6 to 9 illustrate the results of various experiments using the energy storage unit according to the embodiment and the energy storage unit of the comparative example.

[0053] The energy storage unit according to the embodiment comprises an energy storage module, a restraint, six elastic members, and aluminum foil covering the elastic members. The energy storage unit according to the comparative example comprises an energy storage module, a restraint, and six elastic members, and the elastic members are not covered with aluminum foil.

[0054] Figure 6 shows the experimental results after heating each energy storage module. Figure 7 is a magnified view of the area enclosed by the rectangle in Figure 6.

[0055] The experimental results shown in Figures 6 and 7 are the results of measuring the temperature change of each energy storage module when the energy storage unit according to the embodiment and the energy storage unit according to the comparative example were heated.

[0056] Graph L1 shows the temperature change of the energy storage module of the energy storage unit according to the embodiment, and graph L2 shows the temperature change of the energy storage module of the energy storage unit according to the comparative example.

[0057] As is clear from Figures 6 and 7, the energy storage unit according to the embodiment takes less time to reach the predetermined temperature TH1. For example, the energy storage unit according to the embodiment takes about 10 minutes less time to reach the predetermined temperature TH1.

[0058] Figure 8 shows the experimental results after cooling each energy storage module. Figure 9 is a magnified view of the area enclosed by the rectangle in Figure 8.

[0059] Graph L3 shows the temperature change of the energy storage module of the energy storage unit according to the embodiment, and graph L4 shows the temperature change of the energy storage module of the energy storage unit according to the comparative example.

[0060] As is clear from Figures 8 and 9, the energy storage unit according to the embodiment is easier to cool. (Variation 1) Figure 10 is a cross-sectional view showing a power storage unit 1A according to modified example 1. As shown in Figure 10, the power storage unit 1A does not include a third elastic member 43 and a second heat conductive member 52, nor a sixth elastic member 73 and a heat conductive member 75. (Modification 2) Figure 11 is a cross-sectional view showing a modified example 2 of the energy storage unit 1B. In the energy storage unit 1B shown in Figure 11, the first heat conductive member 51 is positioned between the first elastic member 41 and the second elastic member 42 and is formed in the shape of a plate. The heat conductive member 74 is positioned between the fifth elastic member 72 and the sixth elastic member 73 and is also formed in the shape of a plate.

[0061] In this energy storage unit 1B, since the first heat conductive member 51 and the heat conductive member 74 are provided, the energy storage module 2 is more easily heated and cooled compared to a case where the first heat conductive member 51 and the heat conductive member 74 are not provided.

[0062] In the above embodiment 1, an example was described in which one energy storage module is provided, but multiple energy storage modules may be stacked.

[0063] In this case, the elastic member according to this embodiment may be placed between each energy storage module. (Embodiment 2) The energy storage device 90 according to Embodiment 2 will be described using Figure 12 and other figures. Figure 12 is a cross-sectional view showing the energy storage device 90.

[0064] The energy storage device 90 comprises a housing case 91, an energy storage module 92, a heat exchanger 93, a buffer member 94, a heat transfer plate 95, and a heat conduction member 96.

[0065] The housing case 91 includes an upper case 100 and a lower case 101. The bottom plate of the lower case 101 is provided with support walls 99A and 99B extending upward. The energy storage module 92 is positioned between support walls 99A and 99B and is constrained by support walls 99A and 99B. The energy storage module 92 includes a plurality of energy storage cells 102 arranged in a first horizontal direction D1. Each energy storage cell 102 includes a cell case and an electrode body housed within the cell case.

[0066] The heat exchanger 93 is located below the energy storage module 92, and a refrigerant passage through which the refrigerant flows is formed inside the heat exchanger 93.

[0067] The heat transfer plates 95 are positioned between the energy storage cells 102. In this example, the heat transfer plates 95 are positioned with a gap between every two energy storage cells 102. Each heat transfer plate 95 is formed to extend downward from between the energy storage cells 102. The heat conduction member 96 is positioned between the lower end of the heat transfer plate 95 and the heat exchanger 93.

[0068] The buffer members 94 are positioned between the energy storage cells 102. In the example shown in this figure, the buffer members 94 are positioned with a gap between every two energy storage cells 102. The heat transfer plates 95 and buffer members 94 are arranged alternately in the first horizontal direction D1.

[0069] Figure 13 is a cross-sectional view showing the buffer member 94. The energy storage module 92 includes an energy storage cell 102A and an energy storage cell 102B, and the energy storage cells 102A and 102B are arranged adjacent to each other in the first horizontal direction D1.

[0070] The buffer member 94 is positioned between the energy storage cells 102A and 102B. The buffer member 94 includes an elastic member 97 and a heat conductive member 98. The heat conductive member 98 is provided to cover the surface of the elastic member 97. The heat conductive member 98 is positioned to be in contact with either of the adjacent energy storage cells 102.

[0071] In the energy storage device 90 configured as described above, for example, when cooling the energy storage module 92, a coolant with a low temperature flows through the heat exchanger 93. Then, the heat from each energy storage cell 102 is dissipated to the heat exchanger 93 through the heat transfer plate 95.

[0072] Furthermore, the heat conductive member 98 of the buffer member 94 is in contact with any of the adjacent energy storage cells 102. Therefore, if there is a temperature difference between adjacent energy storage cells 102, heat transfer is promoted through the heat conductive member 98, and the temperature difference between the energy storage cells 102 can be reduced.

[0073] Furthermore, when the temperature of the energy storage cell 102 rises, the energy storage cell 102 deforms in a way that causes it to expand. At this time, the elastic member 97 of the buffer member 94 deforms in a way that causes it to contract, thereby absorbing the deformation of the energy storage cell 102.

[0074] Similarly, when raising the temperature of the energy storage module 92, the heat from the heat exchanger 93 is transferred to each energy storage cell 102 through the heat transfer plate 95. This allows each energy storage cell 102 to be heated.

[0075] Even if there is a temperature difference between adjacent energy storage cells 102, the temperature difference between the adjacent energy storage cells 102 can be reduced by heat transfer through the heat conductive member 98.

[0076] Even when the temperature of the energy storage module 92 decreases and each energy storage cell 102 contracts, the buffer member 94 deforms to expand. This prevents each energy storage cell 102 from falling out between the support wall 99A and the support wall 99B. (Variation 1) Using Figure 14 and other figures, a modified version of the energy storage device 90A according to Embodiment 2 will be described. Figure 14 is a cross-sectional view showing the buffer member 94A and its surrounding structure in the energy storage device 90A.

[0077] The buffer member 94A includes a first elastic member 111, a second elastic member 112, a third elastic member 113, and a heat conductive member 115.

[0078] The first elastic member 111 is in contact with the energy storage cell 102A, and the third elastic member 113 is in contact with the energy storage cell 102B. The second elastic member 112 is positioned between the first elastic member 111 and the third elastic member 113. The heat conductive member 115 is provided so as to cover the surface of the second elastic member 112.

[0079] The cushioning member 94A allows for uniform temperature distribution between energy storage cells 102A and 102B. Each energy storage cell 102A and 102B is in contact with an elastic member. Therefore, compared to cases where a metal film or the like is in contact, a uniform load can be applied to the pressure surfaces of the energy storage cells 102A and 102B. The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of this disclosure is indicated by the claims rather than by the description of the embodiments above, and all modifications within the meaning and scope of equivalence to the claims are intended. [Explanation of Symbols]

[0080] 1,1A,1B Energy storage unit, 2,92 Energy storage module, 3 Restraint, 10 First restraint plate, 11 Second restraint plate, 12 First connector, 13 Second connector, 14,15 Elastic body unit, 16,74,75,96,98,115 Heat conductive member, 20,23 Lower plate, 21,24 Upper plate, 22,25 Beam, 30,33,34 Support plate, 32,35 Connecting shaft, 41,111 First elastic member, 42,112 Second elastic member, 43,113 Third elastic member, 44,48 Upper main surface, 45,49 Lower main surface, 46 First main surface, 47 Second main surface, 51 First heat conductive member, 52 Second heat conductive member, 53,56 Upper covering part, 54,57 Covering part, 55A, 55B, 58A, 58B Side part, 60, 102, 102A, 102B Energy storage cell, 61 Resin frame, 62 Current collector plate, 63 Negative electrode active material, 64 Positive electrode active material layer, 65 Separator, 66 Aluminum plate, 67 Copper plate, 68, 69 Total current collector plate, 71 4th elastic member, 72 5th elastic member, 73 6th elastic member, 90, 90A Energy storage device, 91 Housing case, 93 Heat exchanger, 94, 94A Buffer member, 95 Heat transfer plate, 97 Elastic member, 99A, 99B Support wall, 100 Upper case, 101 Lower case, D1 1st horizontal direction, D2 2nd horizontal direction, H Up and down direction, L1, L2, L3, L4 Graph, S1 Assembly process, S2 Liquid process, S3 Initial charging process, S4 temperature raising process, S5 high temperature aging process, S6 cooling process, TH1 predetermined temperature.

Claims

1. A restraint device for securing at least one energy storage module, First restraint plate and A second restraint plate is positioned at a distance from the first restraint plate, and the energy storage module is positioned between the second restraint plate and the first restraint plate. A first elastic member is disposed between the first restraint plate and the energy storage module, A second elastic member is disposed between the first elastic member and the first restraint plate, A heat conductive member disposed between the first elastic member and the second elastic member, Equipped with, A restraint device wherein the thermal conductivity of the heat-conducting member is higher than that of the first elastic member, and the thermal conductivity of the heat-conducting member is higher than that of the second elastic member.

2. The second elastic member includes a first main surface and a second main surface arranged in the direction of separation, The first main surface is located on the side of the first elastic member, The second main surface is positioned on the side of the first restraint plate, The heat conductive member includes a first heat conductive member provided on the second elastic member. The restraint according to claim 1, wherein the first heat conductive member is provided so as to cover the first main surface and the second main surface.

3. The system further comprises a third elastic member disposed between the second elastic member and the first restraining plate, The at least one heat conductive member includes a second heat conductive member provided on the third elastic member. The restraint according to claim 2, wherein the second heat conductive member is provided so as to surround the third elastic member.

4. The restraint according to claim 1, wherein the heat conductive member is made of aluminum.

5. A storage module including multiple energy storage cells arranged in the direction of the arrangement, A buffer member disposed between the energy storage cells, A heat exchanger arranged around the aforementioned energy storage module, A heat transfer plate is placed between the aforementioned energy storage cells, Equipped with, The cushioning member is It includes an elastic member and a heat-conducting member covering the elastic member, An energy storage device wherein the thermal conductivity of the heat-conducting member is higher than that of the elastic member.

6. The energy storage module includes a first energy storage cell and a second energy storage cell adjacent to the first energy storage cell. The elastic member is The present invention includes a first elastic member that contacts the first energy storage cell, a second elastic member that contacts the second energy storage cell, and a third elastic member disposed between the first elastic member and the second elastic member. The energy storage device according to claim 5, wherein the heat conductive member is provided so as to cover the third elastic member.

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