Electricity storage device

Abstract

A power storage device is provided with: a power storage module including a plurality of power storage cells; a cooler disposed above the power storage module in the vertical direction; and a heat transfer layer sandwiched between the power storage module and the cooler. The cooler includes: a plurality of flow path portions arranged side by side in an X direction; and a connecting part which is arranged between the flow path parts arranged in the X direction and connects the flow path parts to each other. The flexural rigidity of the connecting part is smaller than the flexural rigidity of each of the plurality of flow path parts.

Description

Technical Field

[0001] The present disclosure relates to an electric storage device. Background Art

[0002] In Japanese Patent Application Laid-Open No. 2023-529400, a battery pack including a plurality of single cells, a tray, a heat pipe, and a cooling pipe is disclosed. The plurality of single cells are housed in a housing space of the tray. The heat pipe covers an upper opening of the housing space of the tray. The cooling pipe is disposed on an outer surface of the heat pipe (a surface on the side opposite to the housing space). Summary of the Invention

[0003] Although not explicitly described in Japanese Patent Application Laid-Open No. 2023-529400, a heat conductive layer is sometimes disposed between the heat pipe (cooler) and the plurality of single cells (electric storage units). In addition, a deviation (non-uniformity) sometimes occurs in the heights of the plurality of single cells. In these cases, in order to match the flat shape of the heat pipe, it is necessary to dispose (stack) a relatively thick heat conductive layer on the single cell having a relatively small height. Therefore, the cooling efficiency of the single cell having a relatively small height deteriorates.

[0004] The present disclosure has been made to solve the above problems, and an object thereof is to provide an electric storage device capable of efficiently cooling a plurality of electric storage units.

[0005] An electric storage device according to an aspect of the present disclosure includes: an electric storage module; a cooler disposed above the electric storage module in the vertical direction; and a heat conductive layer sandwiched between the electric storage module and the cooler. The electric storage module includes a plurality of electric storage units stacked in a predetermined direction. The cooler includes: a plurality of flow path portions arranged in the predetermined direction and extending in the longitudinal direction of the electric storage unit; and at least one connecting portion disposed between the plurality of flow path portions arranged in the predetermined direction. The bending rigidity of the at least one connecting portion is smaller than the bending rigidity of each of the plurality of flow path portions.

[0006] In the power storage device according to one aspect of the present disclosure, as described above, the bending rigidity of the at least one connecting portion is smaller than the bending rigidity of each of the plurality of flow path portions. Accordingly, each of the plurality of flow path portions can be arranged while bending the at least one connecting portion. As a result, even when there are deviations in the heights of the plurality of power storage cells, the plurality of flow path portions can be easily brought into close contact (tight adhesion) with the heat conductive layer without adjusting the thickness of the heat conductive layer according to the heights of the power storage cells. In other words, even if a heat conductive layer with a relatively large thickness is not arranged in a power storage cell with a relatively small height (nor is a heat conductive layer with a relatively small thickness arranged in a power storage cell with a relatively large height), the height positions of the plurality of flow path portions can be made to match (follow) the height position of the heat conductive layer by bending the at least one connecting portion. As a result, the thickness of the heat conductive layer can be made uniform. Accordingly, the plurality of power storage cells can be cooled efficiently.

[0007] In the power storage device according to the above aspect, preferably, the at least one connecting portion has a convex shape protruding upward in the vertical direction or downward in the vertical direction. If configured in this way, the length (linear length) of the at least one connecting portion can be increased as compared with the case where the at least one connecting portion has a flat shape. As a result, the bending rigidity of the at least one connecting portion can be easily reduced as compared with the case where the at least one connecting portion has a flat shape.

[0008] In the power storage device according to the above aspect, preferably, the power storage module includes a heat insulating member disposed between at least some of the plurality of power storage cells. The heat insulating member is disposed at a position overlapping the at least one connecting portion in the vertical direction. Here, it is not necessary to stack a heat conductive layer on the heat insulating member. Therefore, by disposing the heat insulating member at a position overlapping the at least one connecting portion in the vertical direction, the at least one connecting portion can be bent at a position where no heat conductive layer is arranged. As a result, interference between the heat conductive layer and the at least one connecting portion can be suppressed, and thus the at least one connecting portion can be bent more easily.

[0009] In the power storage device according to the above aspect, preferably, the at least one connecting portion includes a plurality of connecting portions. The plurality of connecting portions are arranged at intervals corresponding to a predetermined number of the plurality of power storage cells in the predetermined direction. If configured in this way, the connecting portions can be arranged for every predetermined number of power storage cells. As a result, the plurality of flow path portions can follow the height deviation of the power storage cells more appropriately.

[0010] In this case, preferably, the predetermined number is 3. If configured in this way, the connecting portions can be arranged for every three power storage cells.

[0011] In the power storage device according to one aspect described above, preferably, each of the plurality of flow path portions is provided across a part of the plurality of power storage units among the plurality of power storage units. Each of the plurality of flow path portions has a first flow path through which the coolant flows from one side in the longitudinal direction to the other side in the longitudinal direction, and a second flow path through which the coolant flows from the other side in the longitudinal direction to one side in the longitudinal direction. If configured in this way, through the first flow path, the part on one side (upstream side) in the longitudinal direction of the power storage unit can be cooled more effectively than the part on the other side (downstream side) in the longitudinal direction of the power storage unit. In addition, through the second flow path, the part on the other side (upstream side) in the longitudinal direction of the power storage unit can be cooled more effectively than the part on one side (downstream side) in the longitudinal direction of the power storage unit. As a result, the temperature distribution in the longitudinal direction of the plurality of power storage units can be made uniform by the coolant flowing in each of the first flow path and the second flow path.

[0012] In this case, preferably, the first flow path is disposed at the central portion of each of the plurality of flow path portions in the predetermined direction. The second flow path has a one-side flow path connected to a first branch flow path branched from the first flow path to one side in the predetermined direction, and an other-side flow path connected to a second branch flow path branched from the first flow path to the other side in the predetermined direction. If configured in this way, the first flow path becomes a flow path on the upstream side compared to the second flow path (one-side flow path, other-side flow path), so that the temperature of the coolant flowing in the first flow path can be made lower than the temperature of the coolant flowing in the second flow path. Here, the temperature of the power storage unit disposed at the central portion in the predetermined direction among the plurality of power storage units is likely to be higher than the temperature of the power storage unit disposed at the end side in the predetermined direction. Therefore, by configuring as described above, the power storage unit whose temperature is likely to become higher can be cooled by the coolant with a relatively low temperature flowing in the first flow path, and the power storage unit whose temperature is likely to become lower can be cooled by the coolant with a relatively high temperature flowing in the second flow path. As a result, deviation in the temperature of the plurality of power storage units can be suppressed.

[0013] The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention understood in connection with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is an exploded perspective view showing the configuration of a power storage device according to one embodiment.

[0015] Figure 2 is a perspective view showing the configuration of a power storage unit according to one embodiment.

[0016] Figure 3 is along Figure 1Cross-sectional view taken along line III-III.

[0017] Figure 4 It is a cross-sectional view of the power storage module when there is a deviation in the height of the power storage unit.

[0018] Figure 5 It is a plan view when observing the cooler and the power storage module of one embodiment from the Z1 side.

[0019] Figure 6 It is a cross-sectional view of the power storage module of the first modified example of one embodiment.

[0020] Figure 7 It is a cross-sectional view of the power storage module of the second modified example of one embodiment.

[0021] Figure 8 It is a plan view showing the configuration of the flow path portion of the third modified example of one embodiment. Detailed Embodiments

[0022] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and their description will not be repeated.

[0023] In addition, in this specification, the vertical direction is set as the Z direction. Specifically, the upper side in the extending direction is set as the Z1 direction, and the lower side in the extending direction is set as the Z2 direction. In addition, the X direction and the Y direction are each a direction orthogonal to the Z direction (i.e., the horizontal direction). The X direction is orthogonal to the Y direction. In addition, the X direction and the "Y direction" are respectively an example of the "predetermined direction" and the "long direction" of the present disclosure. Additionally, the Z direction is an example of the "vertical direction" of the present disclosure.

[0024] Figure 1 It is a perspective view showing the configuration of the power storage device 100 of the present embodiment. The power storage device 100 is, for example, a device for storing power for driving an electric vehicle (not shown). In addition, Figure 1 The X direction shown is, for example, the front-rear direction of the electric vehicle. The Y direction is the left-right direction of the electric vehicle. In addition, the power storage device 100 may also be provided in an electrical device other than an electric vehicle (for example, a stationary power storage device).

[0025] The power storage device 100 includes a plurality of (two in the present embodiment) power storage modules 10, a housing 20, and a cooler 30. In addition, the number of power storage modules 10 is not limited to the above example. One power storage module 10 may be provided, or three or more may be provided.

[0026] Figure 2It is a perspective view showing the structure of one of the plurality of power storage units 11 included in the power storage module 10. In addition, the structures and orientations of the plurality of power storage units 11 are the same as each other. The plurality of power storage units 11 are each formed to extend in the Y direction. Specifically, the power storage unit 11 has a prism shape formed to extend in the Y direction. In addition, the plurality of power storage units 11 are stacked (arranged) in the X direction (refer to Figure 3 ).

[0027] The power storage unit 11 has a length L1 in the Y direction. The power storage unit 11 has a length L2 in the X direction. The length L1 is larger than the length L2. That is, the Y direction of the power storage unit 11 is the long direction. In addition, the power storage unit 11 has a height H1 in the Z direction. The height H1 is smaller than the length L1. In addition, the height H1 is larger than the length L2. In addition, the plurality of power storage units 11 may each be arranged to extend in the X direction.

[0028] Refer again to Figure 1 , the housing 20 houses a plurality of power storage modules 10. The housing 20 includes an upper housing 21 and a lower housing 22. The plurality of power storage modules 10 are housed in a space formed by assembling the upper housing 21 to the lower housing 22. The cooler 30 is also housed in the above space. In addition, the configuration of the housing 20 is not limited to the example shown in Figure 1 . For example, the housing 20 may not include the upper housing 21. In addition, the cooler 30 is an example of the "cooler" of the present disclosure.

[0029] The cooler 30 is disposed above (Z1 side) the power storage module 10. The cooler 30 is provided so as to cover the plurality of power storage modules 10 from the Z1 side. The cooler 30 has a plate shape formed to extend along the XY plane. The cooler 30 cools the power storage module 10 by means of a coolant flowing through a flow path portion 31 described later.

[0030] Figure 3 is a cross-sectional view taken along line III-III of Figure 1 . As shown in Figure 3 , the power storage device 100 includes a heat conductive layer 40. The heat conductive layer 40 is coated on the upper end surface 11a of each of the plurality of power storage units 11 (refer to Figure 2 ). The heat conductive layer 40 is sandwiched between the cooler 30 and the power storage module 10 (the plurality of power storage units 11). That is, the heat conductive layer 40 is laminated on the power storage module 10. The cooler 30 is laminated on the heat conductive layer 40. In addition, the heat conductive layer 40 is formed of, for example, a heat conductive adhesive material.

[0031] In addition, the power storage module 10 (refer to Figure 1)It includes a heat insulation member 12. The heat insulation member 12 is disposed between at least some of the plurality of power storage units 11. A plurality of heat insulation members 12 are provided. Specifically, the heat insulation members 12 are arranged for every three power storage units 11 (the power storage unit unit 11U described later) stacked (arranged) in the X direction. In addition, a heat conduction layer 40 is not arranged (stacked) on the heat insulation member 12. Although not shown in the figure, the heat insulation member 12 is also formed in a manner of extending in the Y direction (the Y direction becomes the long direction) similarly to the power storage unit 11.

[0032] The power storage device 100 includes an adhesive layer 50. The adhesive layer 50 is sandwiched between the lower housing 22 and the power storage module 10. Through the adhesive layer 50, the power storage module 10 is fixed to the lower housing 22.

[0033] The cooler 30 includes a plurality of flow path portions 31 arranged in the X direction. Each of the plurality of flow path portions 31 is formed in a manner of extending along the Y direction. Specifically, each of the plurality of flow path portions 31 has a flow path 32, a flow path 33, and a flow path 34. The flow path 32, the flow path 33, and the flow path 34 are each formed in a manner of extending along the Y direction. The flow path 32, the flow path 33, and the flow path 34 communicate with each other. In addition, the flow path 32 is an example of the "first flow path" of the present disclosure. In addition, the flow path 33 is an example of the "second flow path" and the "one-side flow path" of the present disclosure. In addition, the flow path 34 is an example of the "second flow path" and the "other-side flow path" of the present disclosure.

[0034] The flow path 32 is disposed at the central portion of each of the plurality of flow path portions 31. That is, the flow path 32 is disposed between the flow path 33 and the flow path 34. The flow path 33 is disposed on the X1 side of the flow path 32. The flow path 33 is provided near the end portion on the X1 side of each of the plurality of flow path portions 31. The flow path 34 is disposed on the X2 side of the flow path 32. The flow path 34 is provided near the end portion on the X2 side of each of the plurality of flow path portions 31. In addition, the X1 side and the X2 side are examples of the "one side in a predetermined direction" and the "other side in a predetermined direction" of the present disclosure, respectively.

[0035] The cooler 30 includes a connection portion 35 disposed between the (adjacent) flow path portions 31 arranged in the X direction. The connection portion 35 connects the flow path portions 31 to each other. The cooler 30 includes a plurality of connection portions 35. The plurality of connection portions 35 are integrally formed with the plurality of flow path portions 31. That is, the cooler 30 is formed by processing a single plate member. In addition, the manufacturing method of the cooler 30 is not limited to the above example. For example, the flow path portions 31 independently provided may be welded to each other through the connection portion 35. In addition, the flow path portions 31 may be formed by overlapping two plates in the Z direction.

[0036] Here, consider the case where the heights H1 of multiple power storage units 11 deviate. In this case, in order to match the conventional cooler with a flat shape, it is necessary to dispose (stack) a relatively thick heat conductive layer 40 on the power storage unit 11 with a relatively small height H1. Therefore, the cooling efficiency of the power storage unit 11 with a relatively small height H1 deteriorates.

[0037] Therefore, in the present embodiment, the bending rigidity of each of the plurality of connecting portions 35 is smaller than the bending rigidity of each of the plurality of flow path portions 31. In other words, each of the plurality of connecting portions 35 is more easily (bent) deformed than each of the plurality of flow path portions 31. Specifically, the above-mentioned bending rigidity refers to the rigidity against bending of the power storage unit 11 in the longitudinal direction (Y direction).

[0038] Thus, as Figure 4 shown, even when there is a deviation in the height H1 of the power storage unit 11 (refer to Figure 3 ), the deviation in the height H1 can be absorbed by bending the connecting portion 35 with a relatively small bending rigidity. Specifically, the cooler 30 (each flow path portion 31) can be disposed on the heat conductive layer 40 while bending the connecting portion 35. Thus, by bending the connecting portion 35, it is easy to make the height positions of the flow path portions 31 on both sides of the connecting portion 35 different from each other. As a result, for the heat conductive layer 40 disposed on the power storage unit 11 with a relatively small height H1, a pressing force can be easily applied from the Z1 side through the flow path portion 31.

[0039] Referring again to Figure 3 , in the present embodiment, the connecting portion 35 has a convex shape protruding upward (Z1 side) in the vertical direction. Specifically, the connecting portion 35 includes a pair of side portions 35a extending from the end portions of the adjacent flow path portions 31 toward the Z1 side. In addition, the connecting portion 35 includes a flat portion 35b connecting the end portions on the Z1 side of the pair of side portions 35a. The flat portion 35b extends along the XY plane in a manner intersecting the Z direction. In addition, the shapes of the plurality of connecting portions 35 are the same as each other. In addition, a bent portion 36 is formed between each of the pair of side portions 35a and the flow path portion 31.

[0040] In addition, the plurality of connecting portions 35 are arranged at intervals D corresponding to the three stacked power storage units 11 in the X direction. In addition, the above three power storage units 11 constitute a power storage unit unit 11U. The interval D is substantially equal to the interval between the heat insulating members 12.

[0041] Each of the plurality of flow path portions 31 is provided across the above three power storage units 11. That is, each of the plurality of flow path portions 31 is provided so as to cover the power storage unit unit 11U from the Z1 side. In addition, the heat conductive layer 40 is disposed in each power storage unit unit 11U. That is, a plurality of heat conductive layers 40 divided and disconnected for each power storage unit unit 11U are arranged in the power storage module 10.

[0042] The flow path 32 is disposed on the Z1 side of the power storage unit 11 at the center in the X direction in the power storage unit unit 11U. The flow path 33 is disposed on the Z1 side of the power storage unit 11 on the X1 side in the power storage unit unit 11U. The flow path 34 is disposed on the Z1 side of the power storage unit 11 on the X2 side in the power storage unit unit 11U.

[0043] Thus, each of the three power storage units 11 is cooled by mutually different flow paths (32, 33, or 34). That is, the three power storage units 11 can be cooled independently of each other. Thus, it is possible to suppress the cooling of each power storage unit 11 from being interfered with by other power storage units 11, and thus each power storage unit 11 can be cooled efficiently.

[0044] The heat insulating member 12 is disposed at a position overlapping each of the plurality of connection portions 35 in the Z direction. A space S1 is formed between the heat insulating member 12 and the connection portion 35 disposed at the overlapping position in the Z direction. The heat conductive layer 40 is not disposed in the space S1.

[0045] The heat insulating member 12 has a height H2 in the Z direction. The height H2 is larger than the height H1 of the power storage unit 11.

[0046] Figure 5 It is a plan view when observing the cooler 30 from the Z1 side. Figure 5 The dotted line and the dash-dotted line in show the power storage unit 11 and the flow path portion 31, respectively. In addition, Figure 5 the arrow in shows the flow direction of the coolant. In the flow path 32, the coolant flows from the Y1 side to the Y2 side. In each of the flow paths 33 and 34, the coolant flows from the Y2 side to the Y1 side. That is, the coolant flowing in the flow path 32 and the coolant flowing in each of the flow paths 33 and 34 flow in opposite directions to each other. In addition, the flow direction of the coolant in each flow path (32 to 34) is the same among the plurality of flow path portions 31. In addition, the Y1 side and the Y2 side are examples of "one side in the longitudinal direction" and "the other side in the longitudinal direction" of the present disclosure, respectively.

[0047] Each of the plurality of flow path portions 31 includes a connection flow path 31a branched from the flow path 32 to the X1 side and a connection flow path 31b branched from the flow path 32 to the X2 side. The connection flow path 31a connects the end portion 32a on the Y2 side of the flow path 32 and the end portion 33a on the Y2 side of the flow path 33. The connection flow path 31b connects the end portion 32a and the end portion 34a on the Y2 side of the flow path 34. In addition, the connection flow path 31a and the connection flow path 31b are examples of the "first branch flow path" and the "second branch flow path" of the present disclosure, respectively.

[0048] Thus, a U-shaped flow path is formed through the flow paths 32 and 33. In addition, a U-shaped flow path is formed through the flow paths 32 and 34. In addition, a W-shaped flow path is formed through the flow paths 32, 33, and 34.

[0049] As can be seen from the above-described case where the coolant is branched, the flow rate of the coolant flowing through the flow path 32 is larger than the flow rates of the coolant flowing through the flow paths 33 and 34, respectively. For example, the flow rate of the coolant flowing through the flow path 32 can be twice the flow rates of the coolant flowing through the flow paths 33 and 34, respectively. In addition, the flow rate of the coolant flowing through the flow path 33 can be equal to the flow rate of the coolant flowing through the flow path 34. Furthermore, although not shown in the drawings, the flow path area of the flow path 32 can be larger than the flow path areas of the flow paths 33 and 34, respectively (for example, it can be twice as large).

[0050] As described above, in the present embodiment, the bending rigidity of each of the plurality of connecting portions 35 is smaller than the bending rigidity of each of the plurality of flow path portions 31. Thus, each of the plurality of connecting portions 35 can be bent without bending each of the plurality of flow path portions 31. As a result, by bending the connecting portion 35, the height positions of the flow path portions 31 connected by the bent connecting portion 35 can be different from each other. As a result, even if there is a deviation in the height H1 between the power storage units 11, each of the flow path portions 31 can be easily arranged on the power storage unit 11 (heat conductive layer 40) by bending the connecting portion 35. Thus, it is not necessary to adjust the thickness of the heat conductive layer 40 for each power storage unit 11 in order to absorb the deviation in the height H1 of the power storage unit 11. As a result, the thickness of the heat conductive layer 40 can be made uniform, and thus the cooling efficiency of the cooler 30 can be made efficient (uniform).

[0051] In addition, in the present embodiment, each of the plurality of connecting portions 35 has a convex shape protruding upward in the vertical direction. Thus, compared with the case where each of the plurality of connecting portions 35 has a flat shape, the length (linear length) of each of the plurality of connecting portions 35 can be increased. As a result, the bending rigidity of each of the plurality of connecting portions 35 can be easily reduced. In addition, the bending amount (deformation amount) of each of the plurality of connecting portions 35 can be easily ensured.

[0052] In the above-described embodiment, an example is shown in which the connecting portion 35 has a convex shape protruding upward in the vertical direction, but the present disclosure is not limited thereto. As Figure 6 shown, it may also be that the connecting portion 135 protruding downward in the vertical direction connects the flow path portions 31 to each other.

[0053] In the above-described embodiment, an example is shown in which three power storage units 11 are arranged in a region corresponding to the interval D between the connection portions 35, but the present disclosure is not limited thereto. It is also possible that the number of power storage units 11 other than three is arranged in the above region. For example, in Figure 7 In the example shown, four power storage units 11 are arranged in the above region. Further, in this case, the flow path portion 131 may include the flow paths 33, 34, and two flow paths 32 arranged between the flow paths 33 and 34. Further, it is also possible that only one power storage unit 11 is provided in the above region.

[0054] In the above-described embodiment, an example is shown in which each flow path (32 to 34) in the flow path portion 31 extends in the Y direction, but the present disclosure is not limited thereto. It is also possible that each flow path extends in the X direction.

[0055] In the above-described embodiment, an example is shown in which a plurality of connection portions 35 are provided in the cooler 30, but the present disclosure is not limited thereto. It is also possible that only one connection portion 35 is provided in the cooler.

[0056] In the above-described embodiment, an example is shown in which the power storage module 10 includes the heat insulating member 12, but the present disclosure is not limited thereto. It is also possible that the power storage module 10 does not include the heat insulating member 12.

[0057] In the above-described embodiment, an example is shown in which the connection portion 35 is provided above the heat insulating member 12, but the present disclosure is not limited thereto. The connection portion 35 may also be provided at a position other than above the heat insulating member 12. For example, the connection portion 35 may also be provided above the space S2 (see Figure 1 ) between two power storage modules 10.

[0058] In the above-described embodiment, an example is shown in which no flow path is provided in the connection portion 35, but the present disclosure is not limited thereto. It is also possible that a flow path is provided in the connection portion 35.

[0059] In the above-described embodiment, an example is shown in which the flow paths 33 and 34 branched from the flow path 32 are provided in the flow path portion 31, but the present disclosure is not limited thereto. It is also possible that a portion for branching the coolant is not formed in the flow path portion. For example, in Figure 8 In the example shown, the end portion 32b on the Y1 side of the flow path 32 and the end portion 34b on the Y1 side of the flow path 34 are connected by the connecting flow path 31c. Further, the end portion 32a of the flow path 32 and the end portion 33a of the flow path 33 are connected by the connecting flow path 31d.

[0060] In the above-described embodiment, an example is shown in which the number of flow paths (32 to 34) provided in the flow path portion 31 is equal to the number of power storage units 11 corresponding to the flow path portion 31. However, the present disclosure is not limited thereto. The number of flow paths provided in the flow path portion may be different from the number of power storage units corresponding to the flow path portion.

[0061] In the above-described embodiment, an example is shown in which each of the plurality of flow path portions 31 is provided across three power storage units 11. However, the present disclosure is not limited thereto. The number of power storage units 11 across which the plurality of flow path portions 31 extend may also be different from each other.

[0062] In the above-described embodiment, an example is shown in which the connecting portion 35 has a convex shape. However, the present disclosure is not limited thereto. The connecting portion may be formed in a flat plate shape. For example, the bending rigidity of the connecting portion may be made lower than that of the flow path portion by making the thickness of the connecting portion smaller than the thickness of the flow path portion. Alternatively, the bending rigidity of the connecting portion may be made lower than that of the flow path portion by making the bending rigidity of the material of the connecting portion lower than the bending rigidity of the material of the flow path portion.

[0063] In the above-described embodiment, an example is shown in which the flow paths 32, 33, and 34 communicate with each other. However, the present disclosure is not limited thereto. The flow paths 32, 33, and 34 may not communicate with each other.

[0064] In addition, the configurations (processes) of the above-described embodiment and the above-described respective modification examples may be combined with each other.

[0065] Although the embodiments of the present invention have been described, it should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is represented by the claims and is intended to include all modifications within the meaning and scope equivalent to the claims.

Claims

1. A power storage device, comprising: A power storage module; A cooler disposed above the power storage module in the vertical direction; and A heat conductive layer sandwiched between the power storage module and the cooler, The power storage module includes a plurality of power storage units stacked in a predetermined direction, The cooler includes: A plurality of flow path portions arranged in the predetermined direction and extending in the longitudinal direction of the power storage unit; And At least one connecting portion disposed between the plurality of flow path portions arranged in the predetermined direction, The bending rigidity of the at least one connecting portion is smaller than the bending rigidity of each of the plurality of flow path portions.

2. The power storage device according to claim 1, The at least one connecting portion has a convex shape protruding upward or downward in the vertical direction.

3. The power storage device according to claim 1 or 2, The power storage module includes a heat insulating member disposed between at least some of the plurality of power storage units, The heat insulating member is disposed at a position overlapping the at least one connecting portion in the vertical direction.

4. The power storage device according to claim 1 or 2, The at least one connecting portion includes a plurality of connecting portions, The plurality of connecting portions are arranged at intervals corresponding to a predetermined number of power storage units among the plurality of power storage units in the predetermined direction.

5. The power storage device according to claim 4, The predetermined number is 3.

6. The power storage device according to claim 1 or 2, Each of the plurality of flow path portions is provided across a plurality of power storage units among the plurality of power storage units, Each of the plurality of flow path portions has a first flow path for allowing a coolant to flow from one side in the longitudinal direction to the other side in the longitudinal direction, and a second flow path for allowing the coolant to flow from the other side in the longitudinal direction to one side in the longitudinal direction.

7. The power storage device according to claim 6, The first flow path is disposed at the central portion of each of the plurality of flow path portions in the predetermined direction, The second flow path has a side flow path connected to a first branch flow path branched from the first flow path to one side in the predetermined direction, and another side flow path connected to a second branch flow path branched from the first flow path to the other side in the predetermined direction.

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