Power storage device

Abstract

To provide a power storage device that allows a cooler to be brought into close contact with an outer surface of a lower case so as to conform thereto.SOLUTION: A power storage device includes a lower case having a bottom portion including an inner surface and an outer surface, one or more power storage modules thermally connected to the inner surface of the bottom portion, and a cooler 30 that is provided on a side of the outer surface of the bottom portion and cools the one or more power storage modules via the bottom portion. The cooler is made of a member having a rigidity lower than that of the lower case. The cooler 30 includes a force exerting portion that exerts a force toward the bottom portion.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to an electricity storage device mounted on a vehicle. [Background technology]

[0002] As a conventional electricity storage device, JP 2019-125449 A (Patent Document 1) discloses a configuration in which a electricity storage stack, a heat transfer member, and a cooler are abutted in this order and housed in a housing case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-125449 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, the size of coolers for cooling power storage stacks has increased along with the trend toward higher capacity. A configuration in which the cooler is disposed outside the housing case, rather than housed within the housing case, has been considered. In such a case, it is considered that the outer surface of the lower case and the cooler are in thermal contact with each other. Depending on the difference in material between the cooler and the lower case, it may be difficult to fit the cooler closely to the lower case.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and an object of the present disclosure is to provide an electricity storage device in which a cooler can be closely attached to the outer surface of the lower case so as to blend in with the outer surface of the lower case. [Means for solving the problem]

[0006] The power storage device according to the present disclosure includes a lower case having a bottom including an inner surface and an outer surface, one or more power storage modules thermally connected to the inner surface of the bottom, and a cooler provided on the outer surface side of the bottom and cooling the one or more power storage modules via the bottom. The cooler is made of a member having a lower rigidity than the lower case. The cooler includes a force generating portion that generates a force toward the bottom.

[0007] According to the above configuration, even if the cooler is made of a material with lower rigidity than the lower case, the force exerting portion presses the cooler toward the bottom, so that the cooler can be made to fit closely to the outer surface of the lower case.

[0008] In the power storage device according to the present disclosure, the cooler may include one or more cooling units for cooling the one or more power storage modules, a holding unit for holding the one or more cooling units, and a fastening piece that protrudes outward from the holding unit and is fastened to the outer surface of the bottom. It is preferable that the fastening piece includes a root portion connected to the holding unit, and the root portion is provided with a notch. In this case, the force generating portion may be constituted by the fastening piece.

[0009] According to the above configuration, a notch is provided at the base portion of the fastening piece connected to the retaining portion, so that when the fastening piece is fastened to the lower case, the fastening piece deforms and acts as a spring structure, allowing the cooler to be fitted closely to the outer surface of the lower case.

[0010] In the power storage device according to the present disclosure, the power storage module may include a first power storage module and a second power storage module arranged side by side in a first direction. Each of the first power storage module and the second power storage module may include a plurality of power storage cells arranged in a second direction intersecting the first direction. The cooling unit may include a first module cooling unit arranged below the bottom so as to sandwich the bottom between the first power storage module and the second power storage module, and a second module cooling unit arranged below the bottom so as to sandwich the bottom between the second power storage module and the first module cooling unit. Each of the first module cooling unit and the second module cooling unit extends along the second direction and has a first end and a second end in the second direction. In this case, the holding portion may include a first holding portion extending along the first direction and holding the first ends of the first module cooling portion and the second module cooling portion, and a second holding portion extending along the first direction and holding the second ends of the first module cooling portion and the second module cooling portion. Also, the fastening piece portion may include a first fastening piece portion protruding outward along the second direction from a portion of the first holding portion located between the first module cooling portion and the second module cooling portion in the first direction, and a second fastening piece portion protruding outward along the second direction from a portion of the second holding portion located between the first module cooling portion and the second module cooling portion in the first direction.

[0011] According to the above configuration, the first fastening piece portion and the second fastening piece portion are provided so as to protrude outward from the first holding portion and the second holding portion in the portion located between the first module cooling portion and the second module cooling portion, thereby providing a spring structure for the first fastening piece portion and the second fastening piece portion. of Furthermore, compared to a configuration in which fastening pieces are provided on both ends of each module cooling portion, the number of fastening pieces can be reduced, and weight can also be reduced.

[0012] The power storage device according to the present disclosure may include a panel that covers the cooler from a lower side of the cooler, and a damper member. Each of the one or more power storage modules may include a first power storage stack and a second power storage stack that are arranged side by side in a first direction. Each of the one or more cooling units may include a first module cooling unit arranged below the bottom so as to sandwich the bottom with the first power storage stack, and a second module cooling unit arranged below the bottom so as to sandwich the bottom with the second power storage stack. The cooler may include a connection piece that connects the first module cooling unit and the second module cooling unit. It is preferable that the damper member is provided so as to be sandwiched between the connection piece and the panel. In this case, the force generating unit may be constituted by the damper member.

[0013] According to the above-described configuration, the reaction force of the damper member can bring the cooler into closer contact with the bottom side of the lower case.

[0014] The power storage device according to the present disclosure may further include a panel that covers the cooler from below the cooler. The one or more power storage modules may include a plurality of power storage modules arranged side by side in a first direction. Furthermore, the one or more cooling units may be spaced apart in the first direction in correspondence with the plurality of power storage modules. of The cooling device may include a plurality of cooling sections arranged side by side with a space therebetween. The cooling device may include a reinforcing piece portion connecting the adjacent cooling sections to each other. I The reinforcing piece is preferably provided so as to be sandwiched between the bottom portion and the panel. In this case, the force generating portion may be constituted by the reinforcing piece.

[0015] According to the above configuration, by sandwiching the reinforcing piece between the bottom and the panel, the reinforcing piece can be deformed to fit closely to the bottom so as to conform to the cooler.

[0016] The power storage device according to the present disclosure may include a panel that covers the cooler from below the cooler. The cooler may include one or more cooling units that cool the one or more power storage modules, a holding unit that holds the one or more cooling units, and a protruding piece that protrudes outward from the holding unit. It is preferable that the protruding piece is provided so as to be sandwiched between the bottom and the panel. In this case, the force generating portion may be constituted by the protruding piece.

[0017] According to the above configuration, by sandwiching the protruding piece between the bottom and the panel, the protruding piece can be deformed, so that the cooler can be fitted closely to the bottom so as to fit comfortably. Effect of the Invention

[0018] According to the present disclosure, it is possible to provide an electricity storage device in which the cooler can be closely attached so as to blend in with the outer surface of the lower case. [Brief description of the drawings]

[0019] [Figure 1] 1 is an exploded perspective view of an electricity storage device according to an embodiment; [Diagram 2] FIG. 2 is a perspective view of a cooler according to the embodiment. [Diagram 3] 6A to 6C are diagrams for explaining a fixing manner of a reinforcing piece portion of a cooler according to an embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV shown in FIG. [Diagram 5] 11A and 11B are diagrams for explaining a fixing manner of a protruding piece portion of a cooler according to an embodiment. [Figure 6] 6 is a cross-sectional view taken along line VI-VI shown in FIG. 5. [Figure 7] 4 is a cross-sectional view showing an installation mode of a damper member in the cooler according to the embodiment. FIG. [Figure 8] FIG. 2 is a perspective view showing a fastening piece portion of a cooler according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference characters in the drawings, and the description thereof will not be repeated.

[0021] Fig. 1 is an exploded perspective view of an electricity storage device according to an embodiment. With reference to Fig. 1, an electricity storage device 1 according to the first embodiment will be described.

[0022] The electricity storage device 1 according to the embodiment is mounted on a hybrid vehicle capable of running using at least one of the power of a motor and an engine, or on an electrically powered vehicle that runs using driving force obtained from electric energy.

[0023] As shown in FIG. 1, the energy storage device 1 according to the first embodiment includes a plurality of energy storage modules 10, a storage case 20, a cooler 30, a heat conductive member 40, a share panel 50, and an inner heat conductive layer 60.

[0024] The plurality of power storage modules 10 are arranged side by side at intervals in a first direction (DR1 direction). Each of the plurality of power storage modules 10 includes a first power storage stack 11 and a second power storage stack 12 arranged side by side in the first direction. of The first direction is, for example, parallel to the front-rear direction of the vehicle when the power storage device 1 is mounted on the vehicle.

[0025] The first power storage stack 11 and the second power storage stack 12 include a plurality of power storage cells 13 arranged in a second direction (DR2 direction) intersecting the first direction. The second direction is perpendicular to the first direction and, in the mounted state, is, for example, parallel to the left-right direction of the vehicle.

[0026] The storage cell 13 is, for example, a secondary battery such as a nickel-metal hydride battery or a lithium-ion battery. The storage cell 13 has, for example, a rectangular shape. The storage cell 13 may use a liquid electrolyte or a solid electrolyte. The storage cell 13 may also be a unit capacitor configured to be capable of storing electricity.

[0027] The storage case 20 accommodates a plurality of power storage modules 10. The storage case 20 includes an upper case 21 and a lower case 22.

[0028] The upper case 21 has a generally box-like shape that is open downward. The upper case 21 may be made of a metal material. Moreover, in order to reduce weight, the upper case 21 may be made of a resin material.

[0029] The lower case 22 includes a main body portion 23, a plurality of bracket portions 25, and a pair of frame portions 26 (see FIG. 5). Note that the frame portions 26 are omitted in FIG. 1 for the sake of convenience.

[0030] The main body 23 has a generally box-like shape that is open upward. The main body 23 is made of a metal material such as iron. The main body 23 has a bottom wall 24. The bottom wall 24, the multiple bracket portions 25, and bottom wall portions 261 (see FIG. 6 ) of the pair of frame portions 26, which will be described later, form the bottom of the lower case 22.

[0031] The multiple bracket portions 25 are arranged to be aligned at intervals in the first direction. The multiple bracket portions 25 are fixed to the bottom wall portion 24. The multiple bracket portions 25 are provided so as to protrude downward from the bottom wall portion 24. The multiple bracket portions 25 are provided so as to enter gaps between adjacent cooling portions 31. Each of the multiple bracket portions 25 is provided so as to cover a portion of the bottom wall portion 24. The multiple bracket portions 25 are provided so as to extend along the second direction.

[0032] The pair of frame parts 26 are attached to both ends of the main body part 23 in the first direction. The frame part 26 located on one side in the first direction is The The frame portion 26 located on the other side in the first direction is provided so as to cover the end portion of the second main surface 24b located on the other side, and the side wall portion of the main body portion 23 located on the other side. The frame portion 26 located on the other side in the first direction is provided so as to cover the end portion of the second main surface 24b located on the other side, and the side wall portion of the main body portion 23 located on the other side.

[0033] The bottom wall 24 of the main body 23 has a first main surface 24a and a second main surface 24b facing each other. The first main surface 24a constitutes the inner surface of the bottom of the lower case 22. The second main surface 24b, together with the outer surfaces of the multiple bracket portions 25 and the lower surface of the bottom wall 261, constitutes the outer surface (lower surface) of the bottom of the lower case 22.

[0034] The cooler 30 is a device for cooling the multiple power storage modules 10. A coolant flow path through which a coolant flows is provided inside the cooler 30. The coolant flow path is connected to a coolant introduction section 61 and a coolant discharge section 62. The coolant introduced from the coolant introduction section 61 to the coolant flow path cools the multiple power storage modules 10 and is discharged from the coolant discharge section 62.

[0035] The cooler 30 is disposed below the bottom wall portion 24 of the lower case 22. The cooler 30 cools the multiple power storage modules 10 via the bottom portion (more specifically, the bottom wall portion 24) of the lower case 22. The cooler 30 includes multiple cooling units 31 for cooling the individual power storage modules 10, and a force generating unit, which will be described later. The cooler 30 is made of a metal material such as aluminum. The rigidity of the cooler 30 is lower than the rigidity of the lower case 22. The detailed structure of the cooler 30 will be described later with reference to FIG. 2.

[0036] The heat conductive member 40 is disposed between the second main surface 24b of the bottom wall portion 24 and the cooler 30. The multiple power storage modules 10 are cooled by the cooler 30 via the heat conductive member 40, the bottom wall portion 24, and the inner heat conductive layer 60. The heat conductive member 40 also functions as an adhesive layer that bonds the bottom wall portion 24 and the cooler 30. As the heat conductive member 40, for example, an adhesive containing a silicone resin, an acrylic resin, an epoxy resin, or the like can be used.

[0037] The share panel 50 is disposed so as to cover the lower side of the cooler 30. The share panel 50 protects the cooler 30 and also prevents the cooler 30 from being exposed to water. The share panel 50 is made of a metal material.

[0038] The inner thermally conductive layer 60 is disposed between each power storage module 10 and the first main surface 24a. More specifically, the inner thermally conductive layer 60 is disposed between the first power storage stack 11 and the second power storage stack 12 included in each power storage module 10 and the first main surface 24a. The inner thermally conductive layer 60 also functions as an adhesive layer, and adhesively fixes each power storage module 10 to the bottom wall portion 24. As a result, the multiple power storage modules 10 are in thermal contact with the inner surface of the lower case (specifically, the first main surface 24a) via the inner thermally conductive layer 60.

[0039] The inner thermally conductive layer 60 is made of a resin member having thermal conductivity. For example, a silicone-based resin, an acrylic-based resin, or an adhesive containing a urethane resin, an epoxy resin, or the like can be used as the inner thermally conductive layer 60.

[0040] 2 is a perspective view of a cooler according to an embodiment of the present invention, and the configuration of the cooler 30 will be described with reference to FIG.

[0041] 2, the cooler 30 includes a plurality of cooling portions 31, a holding portion 32, a plurality of fastening piece portions 33, a plurality of connecting piece portions 34, a plurality of reinforcing piece portions 36, and a plurality of protruding piece portions 37. Each of the plurality of fastening piece portions 33, the plurality of connecting piece portions 34, the plurality of reinforcing piece portions 36, and the plurality of protruding piece portions 37 functions as a force generating portion.

[0042] The multiple cooling units 31 are arranged side by side at intervals in the first direction. The multiple cooling units 31 are arranged at positions corresponding to the multiple power storage modules 10. Each of the multiple cooling units 31 includes a first module cooling unit 311 and a second module cooling unit 312.

[0043] The first module cooling section 311 is disposed below the bottom (more specifically, the bottom wall section 24) of the lower case 22 so as to sandwich the bottom (more specifically, the bottom wall section 24) between the first power storage stack 11 and the first module cooling section 311. The first module cooling section 311 extends along the second direction. The first module cooling section 311 has a first end section 311a and a second end section 311b in the second direction.

[0044] The second module cooling section 312 is disposed below the bottom (more specifically, the bottom wall section 24) of the lower case 22 so as to sandwich the bottom (more specifically, the bottom wall section 24) between the second power storage stack 12 and the second module cooling section 312. The second module cooling section 312 extends along the second direction. The second module cooling section 312 has a first end section 312a and a second end section 312b in the second direction.

[0045] The holding portion 32 holds a plurality of cooling portions 31. The holding portion 32 has a first holding portion 321 and a second holding portion 322, as well as a front portion 323 and a rear portion 324.

[0046] The first holding portion 321 extends along the first direction. The first holding portion 321 holds the first end portion 311a of the first module cooling portion 311 and the first end portion 312a of the second module cooling portion 312 in each of the cooling portions 31.

[0047] The second holding portion 322 is disposed at an interval from the first holding portion 321 in the second direction. The second holding portion 322 extends along the first direction. The second holding portion 322 holds the second end portion 311b of the first module cooling portion 311 and the second end portion 312b of the second module cooling portion 312 in each of the cooling portions 31.

[0048] The front portion 323 and the rear portion 324 constitute both ends of the cooler 30 in the DR1 direction.

[0049] The front portion 323 is located on one side of the cooler 30 in the first direction. The front portion 323 is provided to connect the first holding portion 321 and the second holding portion 322 on one side in the first direction. The front portion 323 is provided to protrude from one end of the first holding portion 321 and the second holding portion 322 in the first direction to one side in the first direction. The front portion 323 has a substantially C-shape. A refrigerant introduction portion 61 and a refrigerant discharge portion 62 are provided in the front portion 323.

[0050] The rear portion 324 is located on the other side of the cooler 30 in the first direction. The rear portion 324 is provided to connect the first holding portion 321 and the second holding portion 322 on the other side in the first direction. The rear portion 324 extends along the second direction.

[0051] The multiple fastening pieces 33 are provided so as to protrude outward from the holding portion 32. Specifically, the multiple fastening pieces 33 protrude outward in the second direction from the holding portion 32. The multiple fastening pieces 33 are provided at intervals in the first direction. The multiple fastening pieces 33 are provided on each of the first holding portion 321 and the second holding portion 322.

[0052] The multiple fastening pieces 33 include multiple first fastening pieces 331 provided on the first holding portion 321 and multiple second fastening pieces 332 provided on the second holding portion 322.

[0053] Each of the multiple first fastening pieces 331 protrudes outward in the second direction from a portion of the first holding portion 321 located between the first module cooling portion 311 and the second module cooling portion 312 in the first direction.

[0054] Each of the multiple second fastening pieces 332 protrudes outward in the second direction from a portion of the second holding portion 322 located between the first module cooling portion 311 and the second module cooling portion 312 in the first direction.

[0055] The multiple connection pieces 34 are provided in each cooling section 31 so as to connect the first module cooling section 311 and the second module cooling section 312. The multiple connection pieces 34 are arranged at intervals in the second direction. A damper member 80 is provided on the back surface of the connection pieces 34.

[0056] The multiple reinforcing piece portions 36 are provided so as to connect adjacent cooling portions 31. The multiple reinforcing piece portions 36 are arranged at intervals in the second direction between adjacent cooling portions 31. Between adjacent cooling portions 31, the reinforcing piece portions 36 located at both ends in the second direction are located outside the multiple connecting piece portions 34 in the second direction. Between adjacent cooling portions 31, the interval between the multiple reinforcing piece portions 36 in the second direction is larger than the interval between the multiple connecting piece portions 34 in the second direction.

[0057] The multiple protruding pieces 37 are provided so as to protrude outward from the holding portion 32. The multiple protruding pieces 37 protrude in a direction different from the direction in which the multiple fastening pieces 33 protrude. The multiple protruding pieces 37 protrude outward in the first direction.

[0058] The multiple protruding pieces 37 include a first protruding piece 371 protruding from the front portion 323 toward one side in the first direction, and a second protruding piece 372 protruding from the rear portion 324 toward the other side in the first direction.

[0059] Fig. 3 is a diagram for explaining a fixing mode of the reinforcing piece of the cooler according to the embodiment. For convenience, the shear panel 50 is omitted in Fig. 3, and a view of the cooler 30 and the lower case 22 is shown as seen from the bottom side of the lower case 22. In Fig. 3, the up-down direction is reversed. Fig. 4 is a cross-sectional view taken along the line IV-IV shown in Fig. 3. The fixing mode of the reinforcing piece 36 will be explained with reference to Figs. 3 and 4.

[0060] 3, the bracket portion 25 has a bottom plate portion 251, a pair of side wall portions 252, and a pair of flange portions 253. The bottom plate portion 251 constitutes the bottom portion of the bracket portion 25. The bottom plate portion 251 is provided with a hole portion 25h.

[0061] The pair of side walls 252 are provided so as to stand up from both ends of the bottom plate portion 251 in the first direction. A pair of flanges 253 are connected to ends of the pair of side walls 252 located on the opposite side to the side on which the bottom plate portion 251 is located. The pair of flanges 253 are provided so as to be approximately parallel to the second main surface 24b of the bottom wall portion 24. The pair of flanges 253 are fixed to the second main surface 24b by welding or the like.

[0062] The reinforcing piece portion 36 is provided so as to straddle the bracket portion 25. The reinforcing piece portion 36 has a plate-shaped portion 361, a first connecting portion 362, and a second connecting portion363.

[0063] The plate-shaped portion 361 extends along the first direction. The plate-shaped portion 361 contacts the bottom plate portion 251. The plate-shaped portion 361 is provided with a dome-shaped bulging portion 365. The bulging portion 365 bulges out toward the side opposite (downward) from the side where the bottom of the lower case 22 is located. That is, the bulging portion 365 bulges out toward the share panel 50.

[0064] The first connection portion 362 connects an end of the plate-shaped portion 361 located on one side in the first direction to the cooling portion 31 located on one side in the first direction among the adjacent cooling portions 31. The first connection portion 362 is provided so as to extend downward toward the plate-shaped portion 361.

[0065] The second connection portion 363 connects an end portion of the plate-shaped portion 361 located on the other side in the first direction to the cooling portion 31 located on the other side in the first direction among the adjacent cooling portions 31. The second connection portion 363 is provided so as to extend downward toward the plate-shaped portion 361.

[0066] As shown in FIG. 4, the share panel 50 is fastened to the bracket portion 25 with the fastening member 70 inserted into the hole portion 25h, and the reinforcing piece portion 36 (more specifically, the plate-shaped portion 361) is sandwiched between the bottom of the lower case 22 and the share panel 50.

[0067] In the state where the reinforcing piece 36 is sandwiched, the bulging portion 365 is sandwiched between the bottom plate portion 251 and the shear panel 50, and is elastically deformed to exert an elastic force. A reaction force due to the elastic force acts on the cooler 30, and the cooler 30 is pressed toward the bottom of the lower case 22. In this way, the reinforcing piece 36 functions as the above-mentioned force exerting portion, and the cooler 30 can be brought into close contact with the lower surface of the lower case 22 so as to fit snugly against the lower surface of the lower case 22.

[0068] FIG. 5 is a diagram showing a protrusion of a cooler according to an embodiment. Piece 5 is a diagram for explaining a fixing manner of the protruding piece portion 37. In FIG. 5, the share panel 50 is omitted for convenience, and a view of the cooler 30 and the lower case 22 is shown as seen from the bottom side of the lower case 22. In FIG. 5, the up-down direction is reversed. FIG. 6 is a cross-sectional view taken along the line VI-VI shown in FIG. 5. The fixing manner of the protruding piece portion 37 will be described with reference to FIG. 5 and FIG. 6.

[0069] 5 and 6 show a fixing manner of the protruding piece 37 (first protruding piece 371) provided on the front portion 323. Note that the fixing manner of the protruding piece 37 (second protruding piece 372) provided on the rear portion 324 is also the same as that of the protruding piece 37 (first protruding piece 371) provided on the front portion 323. The protruding piece 37 Since this is almost the same as the fixing mode, the description thereof will be omitted here.

[0070] The frame portion 26 shown in Figures 5 and 6 is attached to an end portion of the main body portion 23 on one side in the first direction, and has a bottom wall portion 261 and a side wall portion 262. The bottom wall portion 261 abuts against the second main surface 24b of a portion located on one side in the first direction, and is provided so as to protrude from the main body portion 23 to one side in the first direction. The bottom wall portion 261 is provided with a mounting portion 263 on which the tip of the protruding piece portion 37 is placed. The mounting portion 263 is provided so as to be recessed upward.

[0071] The side wall portion 262 is connected to an end portion of the bottom wall portion 261 located on one side in the first direction. The side wall portion 262 is provided so as to face the side wall portion 23c of the main body portion 23.

[0072] A bulging portion 375 is provided at the tip of the protruding piece portion 37. The bulging portion 375 bulges out toward the side opposite (downward) the side where the bottom of the lower case 22 is located. That is, the bulging portion 375 bulges out toward the share panel 50.

[0073] Here, the tip of the protruding piece 37 is sandwiched between the bottom of the lower case 22 (more specifically, the bottom wall 261) and the shear panel 50. In this state, the bulging portion 375 is sandwiched between the bottom wall 261 and the shear panel 50, and is elastically deformed to generate an elastic force. A reaction force due to this elastic force acts on the cooler 30, and the cooler 30 is pressed toward the bottom of the lower case 22. In this manner, Projecting piece 37 However, this functions as the force exerting portion described above, and enables the cooler 30 to be closely attached to the lower surface of the lower case 22 so as to conform to the surface.

[0074] Fig. 7 is a cross-sectional view showing an installation mode of a damper member in a cooler according to an embodiment. For convenience, heat conductive member 40 is omitted in Fig. 7. The installation mode of a damper member 80 according to an embodiment will be described with reference to Fig. 7.

[0075] 7, the damper member 80 is sandwiched between the connecting piece portion 34 and the shear panel 50. This causes the damper member 80 to be compressed and deformed, and a reaction force based on this deformation acts on the cooler 30. This allows the cooler 30 to be brought into even closer contact with the bottom side of the lower case 22.

[0076] Fig. 8 is a perspective view showing a fastening piece portion of a cooler according to an embodiment. With reference to Fig. 8, a detailed structure of the fastening piece portion 33 will be described.

[0077] As shown in Fig. 8, the fastening piece portion 33 includes a tip portion 335 and a root portion 336 connected to the holding portion 32. A notch 33h is provided in the root portion 336. By providing the notch 33h, a gap is formed between the tip portion 335 and the holding portion 32. In addition, in the root portion 336, a pair of support portions 337 that support the tip portion 335 are formed on both outer sides of the notch 33h in the first direction. The pair of support portions 337 are arranged side by side in the first direction with a gap therebetween, and extend along the second direction.

[0078] A fastening hole 335h is provided in the center of the tip portion 335. A fastening member is inserted into the fastening hole 335h, and the fastening piece portion 33 is fastened to the bottom of the lower case 22. At this time, due to the provision of the notch portion 33h, the base portion 336 (more specifically, the pair of support portions 337) acts as a spring structure while deforming, and the cooler 30 is pressed toward the bottom of the lower case 22. In this way, the fastening piece portion 33 functions as the above-mentioned force generating portion, and the cooler 30 can be brought into close contact with the lower surface of the lower case 22 so as to fit snugly therewith.

[0079] As described above, by providing the first fastening piece 331 and the second fastening piece 332 between the first module cooling part 311 and the second module cooling part 312 in the first direction, it is possible to enhance the function of the first fastening piece 331 and the second fastening piece 332 as a spring structure. Furthermore, compared to a configuration in which fastening pieces are provided on both sides of each module cooling part, it is possible to reduce the number of fastening pieces, thereby making it possible to reduce the weight of the cooler 30 and, ultimately, the electricity storage device 1.

[0080] (Other variations) In the above-described embodiment, an example has been described in which the energy storage module 10 includes two energy storage stacks, but the number of energy storage stacks is not limited to this and may be one, or three or more.

[0081] In the above-described embodiment, the force generating portion includes the fastening piece portion 33, the reinforcing piece portion 36, the protruding piece portion 37, and the damper member 80. However, it is sufficient that the force generating portion includes at least any one of the fastening piece portion 33, the reinforcing piece portion 36, the protruding piece portion 37, and the damper member 80. In other words, it is sufficient that at least any one of the fastening piece portion 33, the reinforcing piece portion 36, the protruding piece portion 37, and the damper member 80 is provided. When all of the fastening piece portion 33, the reinforcing piece portion 36, the protruding piece portion 37, and the damper member 80 are provided, the cooler 30 can be more effectively fitted closely to the bottom of the lower case 22.

[0082] The embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0083] 1 Energy storage device, 10 Energy storage module, 11 First energy storage stack, 12 Second energy storage stack, 13 Energy storage cell, 20 Storage case, 21 Upper case, 22 Lower case, 23 Main body, 23c Side wall, 24 Bottom wall, 24a First main surface, 24b Second main surface, 25 Bracket, 25h Hole, 26 Frame, 30 Cooler, 31 Cooling section, 32 Holding section, 33 Fastening piece, 33h Notch, 34 Connection piece, 36 Reinforcing piece, 37 Protruding piece, 40 Heat conductive member, 50 Shear panel, 60 Inner heat conductive layer, 61 Coolant introduction section, 62 Coolant discharge section, 70 Fastening member, 80 Damper member, 251 Bottom plate, 252 Side wall, 253 Flange, 261 Bottom wall portion, 262 side wall portion, 263 mounting portion, 311 first module cooling portion, 311a first end portion, 311b second end portion, 312 second module cooling portion, 312a first end portion, 312b second end portion, 321 first holding portion, 322 second holding portion, 323 front portion, 324 rear portion, 331 first fastening piece portion, 332 second fastening piece portion, 335 tip portion, 335h fastening hole, 336 root portion, 337 support portion, 361 plate-shaped portion, 362 first connecting portion, 363 second connecting portion, 365 bulging portion, 371 first protruding piece portion, 372 second protruding piece portion, 375 bulging portion.

Claims

1. a lower case having a bottom including an inner surface and an outer surface; one or more storage modules thermally connected to the inner surface of the base; a cooler provided on the outer surface side of the bottom portion and configured to cool the one or more power storage modules via the bottom portion; the cooler is made of a material having a lower rigidity than the lower case, The cooler includes a force generating portion that generates a force toward the bottom portion, the cooler includes one or more cooling units that cool the one or more power storage modules, a holding unit that holds the one or more cooling units, and a fastening piece that protrudes outward from the holding unit and is fastened to the outer surface of the bottom, The fastening piece portion includes a root portion connected to the holding portion, and a notch is provided in the root portion, The force generating portion is configured by the fastening piece portion.

2. Each of the one or more storage modules includes a first storage stack and a second storage stack arranged side by side in a first direction; the first storage stack and the second storage stack include a plurality of storage cells arranged in a second direction intersecting the first direction, each of the one or more cooling units includes a first module cooling unit arranged below the bottom so as to sandwich the bottom between the first power storage stack and the first module cooling unit, and a second module cooling unit arranged below the bottom so as to sandwich the bottom between the second power storage stack and the first module cooling unit; the first module cooling section and the second module cooling section extend along the second direction and have first and second ends in the second direction; the holding portion includes a first holding portion extending along the first direction and holding the first ends of the first module cooling portion and the second module cooling portion, and a second holding portion extending along the first direction and holding the second ends of the first module cooling portion and the second module cooling portion, 2. The energy storage device of claim 1, wherein the fastening piece includes a first fastening piece protruding outward along the second direction from a portion of the first retaining portion located between the first module cooling portion and the second module cooling portion in the first direction, and a second fastening piece protruding outward along the second direction from a portion of the second retaining portion located between the first module cooling portion and the second module cooling portion in the first direction.

3. a panel covering the cooler from a lower side of the cooler; A damper member, Each of the one or more storage modules includes a first storage stack and a second storage stack arranged side by side in a first direction; each of the one or more cooling units includes a first module cooling unit arranged below the bottom so as to sandwich the bottom between the first power storage stack and the first module cooling unit, and a second module cooling unit arranged below the bottom so as to sandwich the bottom between the second power storage stack and the first module cooling unit; the cooler includes a connection piece portion that connects the first module cooling portion and the second module cooling portion, The damper member is provided so as to be sandwiched between the connection piece portion and the panel, The power storage device according to claim 1 , wherein the force generating portion is formed by the damper member.

4. a panel for covering the cooler from a lower side of the cooler, The one or more storage modules include a plurality of storage modules arranged side by side in a first direction, the one or more cooling units include a plurality of cooling units that are arranged to be spaced apart in the first direction corresponding to the plurality of power storage modules, The cooler includes a reinforcing piece portion that connects adjacent cooling portions, The reinforcing piece is provided so as to be sandwiched between the bottom portion and the panel, The power storage device according to claim 1 , wherein the force generating portion is constituted by the reinforcing piece portion.

5. a panel for covering the cooler from a lower side of the cooler, the cooler includes one or more cooling units that cool the one or more power storage modules, a holding unit that holds the one or more cooling units, and a protruding piece that protrudes outward from the holding unit, The protruding piece is provided so as to be sandwiched between the bottom portion and the panel, The power storage device according to claim 1 , wherein the force generating portion is constituted by the protruding piece.

6. A lower case having a bottom including an inner surface and an outer surface; one or more storage modules thermally connected to the inner surface of the base; a cooler provided on the outer surface side of the bottom portion and configured to cool the one or more power storage modules via the bottom portion; the cooler is made of a material having a lower rigidity than the lower case, The cooler includes a force generating portion that generates a force toward the bottom portion, a panel covering the cooler from a lower side of the cooler; A damper member, Each of the one or more storage modules includes a first storage stack and a second storage stack arranged side by side in a first direction; each of the one or more cooling units includes a first module cooling unit arranged below the bottom so as to sandwich the bottom between the first power storage stack and the first module cooling unit, and a second module cooling unit arranged below the bottom so as to sandwich the bottom between the second power storage stack and the first module cooling unit; the cooler includes a connection piece portion that connects the first module cooling portion and the second module cooling portion, The damper member is provided so as to be sandwiched between the connection piece portion and the panel, The force generating portion is configured by the damper member.

7. A lower case having a bottom including an inner surface and an outer surface; one or more storage modules thermally connected to the inner surface of the base; a cooler provided on the outer surface side of the bottom portion and configured to cool the one or more power storage modules via the bottom portion; the cooler is made of a material having a lower rigidity than the lower case, The cooler includes a force generating portion that generates a force toward the bottom portion, a panel for covering the cooler from a lower side of the cooler, The one or more storage modules include a plurality of storage modules arranged side by side in a first direction, the one or more cooling units include a plurality of cooling units that are arranged to be spaced apart in the first direction corresponding to the plurality of power storage modules, The cooler includes a reinforcing piece portion that connects adjacent cooling portions, The reinforcing piece is provided so as to be sandwiched between the bottom portion and the panel, The force generating portion is constituted by the reinforcing piece portion.

8. A lower case having a bottom including an inner surface and an outer surface; one or more storage modules thermally connected to the inner surface of the base; a cooler provided on the outer surface side of the bottom portion and configured to cool the one or more power storage modules via the bottom portion; the cooler is made of a material having a lower rigidity than the lower case, The cooler includes a force generating portion that generates a force toward the bottom portion, a panel for covering the cooler from a lower side of the cooler, the cooler includes one or more cooling units that cool the one or more power storage modules, a holding unit that holds the one or more cooling units, and a protruding piece that protrudes outward from the holding unit, The protruding piece is provided so as to be sandwiched between the bottom portion and the panel, The force generating portion is configured by the protruding piece portion.

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