Cooling device, battery pack, and vehicle

Abstract

Embodiments of the present disclosure provide a cooling device. The cooling device comprises a first cold plate, second cold plates, and a connecting pipe. The second cold plates are spaced apart from the first cold plate, so that an accommodating space is formed therebetween, and the first cold plate and the second cold plates are in fluid communication by means of the connecting pipe. The cooling device in the embodiments of the present disclosure has a strong cooling capacity.

Description

Cooling devices, battery packs and vehicles

[0001] Cross-references to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202423122099.0, filed on December 17, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, and more particularly to a cooling device, a battery pack, and a vehicle. Background Technology

[0004] Power batteries generate heat during charging. The greater the current flowing through a single cell, the greater the heat generated and the higher the temperature. In related technologies, power batteries typically employ active liquid cooling devices to cool the individual cells. This involves circulating coolant within a liquid cooling plate to remove the heat generated by the cells.

[0005] However, the flow direction of the coolant is usually along the arrangement direction of the battery cells. After the coolant flows through multiple battery cells, the temperature of the coolant rises rapidly, which leads to insufficient cooling of the battery cells at the end of the coolant flow direction, thus affecting the cooling capacity of the power battery. Summary of the Invention

[0006] In view of this, the present disclosure aims to provide a cooling device, battery pack, and vehicle with strong cooling capacity.

[0007] To achieve the above objectives, one embodiment of this disclosure provides a cooling device, comprising:

[0008] First cold plate;

[0009] The second cold plate is spaced apart from the first cold plate so that the space between them forms a receiving space;

[0010] A connecting pipe is provided, through which the first cold plate and the second cold plate are in fluid communication. In one embodiment, the cooling device includes a plurality of second cold plates, each of which is in fluid communication through the connecting pipe, and at least some of the second cold plates are connected in parallel.

[0011] In one embodiment, the first cold plate has a liquid inlet, a liquid outlet, a diversion port, and a return port. The liquid inlet is in fluid communication with the diversion port, the return port is in fluid communication with the liquid outlet, and the connecting pipe is in fluid communication with the diversion port and the return port, respectively.

[0012] In one embodiment, the number of second cold plates is not less than three, and the connecting pipeline includes a connecting pipe, a branch pipe in fluid communication with the branch port, and a return pipe in fluid communication with the return port. The first end of each second cold plate is in fluid communication with the same connecting pipe, the second end of a portion of the second cold plates opposite to the first end is in fluid communication with the same branch pipe, and the second end of another portion of the second cold plates is in fluid communication with the return pipe.

[0013] In one embodiment, the first cold plate includes a first wall and a second wall, with a flow channel formed between the first wall and the second wall, and the battery is located on the side of the first wall away from the second wall; the first wall and the second wall respectively have a first thickness dimension H1 and a second thickness dimension H2 along the thickness direction of the first cold plate, and the flow channel has a height dimension H3 along the thickness direction;

[0014] The first thickness dimension and the height dimension satisfy: 0.02 ≤ H1 / H3 ≤ 5; and / or,

[0015] The second thickness dimension and the height dimension satisfy the following condition: 0.02≤H2 / H3≤5.

[0016] Another embodiment of this disclosure provides a battery pack including a battery and the cooling device described above. The battery is disposed in the receiving space. The battery includes a plurality of individual cells with terminals and an electrical connector connecting the terminals of each individual cell. The side of each individual cell facing away from the terminal is thermally connected to a first cold plate, and a second cold plate is thermally connected to the electrical connector.

[0017] In one embodiment, a plurality of the battery cells are arranged in multiple rows along a first direction and in multiple columns along a second direction perpendicular to the first direction;

[0018] The number of the second cold plates is multiple, and the multiple second cold plates are arranged along the second direction or the first direction.

[0019] In one embodiment, there are multiple electrical connectors, each of which is connected to two adjacent battery cells along the first direction. Multiple second cold plates are arranged along the second direction, and the electrical connectors of the battery cells in two adjacent columns are thermally connected to the same second cold plate.

[0020] In one embodiment, the electrical connector includes a connecting portion and a heat-conducting portion located on one side of the connecting portion. The connecting portion is connected to the terminal of the battery cell, and the second cold plate is connected to the heat-conducting portion.

[0021] In one embodiment, the second cold plate is located on the side of the heat-conducting portion closer to the first cold plate.

[0022] In one embodiment, the side of the second cold plate away from the heat-conducting part contacts the battery cell.

[0023] In one embodiment, there are multiple electrical connectors, each of which connects to two adjacent battery cells; the connection portion includes a bending section and two connecting sections, which are located on opposite sides of the bending section and are respectively connected to the poles of the two adjacent battery cells; there are two heat-conducting parts, which are connected to the connecting sections one by one.

[0024] In one embodiment, the second cold plate has a first width dimension D1 in the lateral direction perpendicular to its own extension direction. The electrical connector has a first heat exchange surface that exchanges heat with the second cold plate. The first heat exchange surface has a second width dimension D2 in the same direction as the first width dimension. The first width dimension and the second width dimension satisfy: 0.8≤D1 / D2≤1.2.

[0025] In one embodiment, the battery cell has a first length dimension D3 along its own length direction and a third width dimension D4 along a width direction perpendicular to the length direction; the terminal post has a second length dimension D5 along the length direction and a fourth width dimension D6 along the width direction; the first length dimension and the second length dimension satisfy: 0.1 ≤ D5 / D3 ≤ 0.4, and the third width dimension and the fourth width dimension satisfy: 0.1 ≤ D6 / D4 ≤ 0.99; and / or,

[0026] In one embodiment, the area S1 of the bottom surface of a single battery cell facing the first cold plate and the contact area S2 of the bottom surface in contact with the first cold plate satisfy: 0.1≤S2 / S1≤1.

[0027] Another embodiment of this disclosure provides a vehicle including the battery pack described above.

[0028] This disclosure provides a cooling device including a first cold plate, a second cold plate, and a connecting pipe. The second cold plate is spaced apart from the first cold plate to form a receiving space. The first and second cold plates are in fluid communication through the connecting pipe. By placing the battery in the receiving space and the coolant flowing inside the first and second cold plates, the heat generated by the battery can be removed, thereby improving the battery's cooling capacity, helping the battery to dissipate heat better, and thus extending the battery's lifespan and improving battery safety. Attached Figure Description

[0029] Figure 1 is a schematic diagram of the structure of a battery pack according to an embodiment of the present disclosure;

[0030] Figure 2 is a schematic diagram of the connection relationship between the first cold plate, the second cold plate and the connecting pipes shown in Figure 1. The straight arrows in the figure indicate the flow direction of the coolant.

[0031] Figure 3 is a partial structural diagram of the battery pack shown in Figure 1;

[0032] Figure 4 is a schematic diagram of the electrical connector shown in Figure 3;

[0033] Figure 5 is a cross-sectional view of a partial structure of a second type of battery pack according to an embodiment of this disclosure;

[0034] Figure 6 is a schematic diagram of the structure of the single cell shown in Figure 1;

[0035] Figure 7 is a structural schematic diagram of the single cell shown in Figure 6 from another perspective. The area with the cross-section line in the figure represents the area corresponding to the heat exchange area.

[0036] Figure 8 is a cross-sectional view of a portion of the structure of the first cold plate shown in Figure 1;

[0037] Figure 9 is a schematic diagram of the structure of the third type of battery pack according to an embodiment of this disclosure.

[0038] Reference numerals: 10, First cold plate; 10a, Diverter port; 10b, Return port; 10c, Flow channel; 10d, Liquid inlet; 10e, Liquid outlet; 11, First wall; 12, Second wall; 20, Battery; 21, Single cell; 21a, Bottom surface; 211, Terminal; 22, Electrical connector; 221, Heat-conducting part; 222, Connecting part; 2221, Connecting section; 2222, Bending section; 30, Second cold plate; 40, Connecting pipe; 41, Connecting pipe; 42, Diverter pipe; 43, Return pipe. Detailed Implementation

[0039] In the description of the embodiments of this disclosure, it should be noted that the terms "first direction", "second direction", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in Figure 1. These orientation terms are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0040] This disclosure provides a battery pack, as shown in Figures 1, 3 and 4, which includes a battery 20 and a cooling device.

[0041] The cooling device includes a first cold plate 10, a second cold plate 30, and a connecting pipe 40. The second cold plate 30 is spaced apart from the first cold plate 10 to form a receiving space. The first cold plate 10 and the second cold plate 30 are in fluid communication through the connecting pipe. Both the first cold plate 10 and the second cold plate 30 are liquid-cooled plates. The battery 20 is placed in the receiving space, and the coolant flows through the interior of the first cold plate 10 and the second cold plate 30 to remove the heat generated by the battery 20.

[0042] The battery 20 includes multiple individual cells 21 with terminals 211 and electrical connectors 22 connecting the terminals 211 of each individual cell 21. The side of each individual cell 21 facing away from the terminal 211 is thermally connected to the first cold plate 10. The second cold plate 30 is thermally connected to the electrical connectors 22.

[0043] Please refer to Figures 1, 3 to 6. The terminal 211 of the battery cell 21 includes at least one positive terminal and at least one negative terminal. The electrical connector 22 shown in Figure 1 connects the positive terminal of one battery cell 21 and the negative terminal of another battery cell 21, so that multiple battery cells 21 are connected in series through the electrical connector 22 to form a battery 20.

[0044] In other embodiments, multiple battery cells 21 can also be connected in parallel or in combination via electrical connectors 22 to form a battery 20.

[0045] The electrical connector 22 and the pole 211 can be connected by various thermally conductive connection methods such as welding, screwing, riveting, and adhesive bonding.

[0046] The first cold plate 10 can be in direct contact with the battery cell 21, and heat exchange media such as thermal pads, thermal adhesives, and structural adhesives can also be provided between the first cold plate 10 and the battery cell 21.

[0047] The second cold plate 30 can be in direct contact with the electrical connector 22, and heat exchange media such as thermal pads, thermal adhesives, and structural adhesives can also be provided between the second cold plate 30 and the electrical connector 22.

[0048] Insulating materials may be provided on the surfaces of the first cold plate 10 and the second cold plate 30, or they may not be provided with insulating materials.

[0049] On the side of the battery cell 21 away from the electrode post 211, the first cold plate 10, which is thermally connected to each battery cell 21, cools the battery cell 21 by absorbing the heat of the battery cell 21.

[0050] On the side of the battery cell 21 with the terminal post 211, the electrical connector 22 transfers the heat of the battery cell 21 to the second cold plate 30, so that the second cold plate 30, which is thermally connected to the electrical connector 22, cools the battery cell 21 by absorbing the heat transferred by the electrical connector 22.

[0051] In other words, the battery pack of this embodiment cools the battery 20 through a cooling device having a first cold plate 10 and a second cold plate 30. The first cold plate 10 and the second cold plate 30 together absorb the heat generated by multiple individual battery cells 21, thereby improving the cooling capacity of the battery 20, helping the battery 20 to achieve better heat dissipation, and thus extending the service life of the battery 20 and improving the safety of the battery 20.

[0052] Another embodiment of this disclosure provides a vehicle that includes the battery pack described in any embodiment of this disclosure.

[0053] In one embodiment, referring to Figures 1 and 2, the cooling device includes a plurality of second cold plates 30, each of which can be fluidly connected through a connecting pipe 40, and at least some of the second cold plates 30 can be connected in parallel. That is, some of the second cold plates 30 can be connected in parallel to the connecting pipe 40, or all of the second cold plates 30 can be connected in parallel to the connecting pipe 40.

[0054] The advantage of the parallel connection of the second cold plate 30 is that the coolant can be dispersed and flow into the parallel second cold plate 30, thereby effectively preventing the coolant from having an excessively long flow path and reducing the cooling effect of the second cold plate 30.

[0055] Please refer to Figure 2. The first cold plate 10 has a diversion port 10a, a return port 10b, a liquid inlet 10d, and a liquid outlet 10e. Coolant enters and exits the first cold plate 10 through the liquid inlet 10d and the liquid outlet 10e, respectively.

[0056] In Figure 2, each of the second cold plates 30 is in fluid communication with the inlet 10d and the outlet 10e via the connecting pipe 40. That is, a portion of the coolant entering the first cold plate 10 from the inlet 10d flows within the first cold plate 10 and exits from the outlet 10e of the first cold plate 10, while another portion of the coolant can flow from the first cold plate 10 into the second cold plate 30. The coolant flowing into the second cold plate 30 also flows out from the outlet 10e of the first cold plate 10. This is equivalent to the coolant in the first cold plate 10 and the second cold plate 30 sharing the inlet 10d and the outlet 10e of the first cold plate 10.

[0057] In other embodiments, the connecting pipe 40 may also be provided with independent inlet and outlet, that is, the coolant flows directly into the connecting pipe 40 from the inlet and flows out from the outlet of the connecting pipe 40 without passing through the first cold plate 10.

[0058] Please refer to Figure 2 for a cooling device with more than three second cold plates 30. In some embodiments, the connecting pipe 40 may include a connecting pipe 41, a branch pipe 42 in fluid communication with the branch port 10a, and a return pipe 43 in fluid communication with the return port 10b. The first end of each second cold plate 30 is in fluid communication with the same connecting pipe 41. A portion of the second cold plates 30 have their second ends, opposite to their first ends, in fluid communication through the same branch pipe 42. That is, the number of second cold plates 30 in fluid communication with the same branch pipe 42 is at least two, and the second cold plates 30 in fluid communication with the same branch pipe 42 are essentially connected in parallel through the branch pipe 42. The second ends of another portion of the second cold plates 30 are in fluid communication with the return pipe 43 one-to-one. The number of second cold plates 30 in fluid communication with the return pipe 43 one-to-one can be one or more.

[0059] Specifically, the coolant first flows through the distributor pipe 42 into the second cold plate 30 which is in fluid communication with the distributor pipe 42, then flows through the connecting pipe 41 into other second cold plates 30, and then flows out from the return pipe 43 which corresponds to each of the other second cold plates 30.

[0060] The connection pipe 41 and the shunt pipe 42 work together to allow the coolant to flow more dispersedly into different second cold plates 30, thereby significantly reducing the temperature difference between different battery cells 21, especially the temperature difference between battery cells 21 located at opposite ends of each second cold plate 30, and thus better improving the cooling effect of the battery pack.

[0061] In one embodiment, referring to FIG8, the first cold plate 10 includes a first wall 11 and a second wall 12, and a flow channel 10c is formed between the first wall 11 and the second wall 12. The battery 20 is located on the side of the first wall 11 away from the second wall 12, and the coolant flows in the flow channel 10c.

[0062] Please refer to Figure 8. The first wall 11 and the second wall 12 have a first thickness dimension H1 and a second thickness dimension H2 along the thickness direction of the first cold plate 10, respectively, and the flow channel 10c has a height dimension H3 along the thickness direction.

[0063] When the thickness of the first wall or the thickness of the second wall is too large relative to the height of the flow channel 10c, it may affect the thermal conductivity of the first cold plate 10, and the heat of the battery 20 cannot be efficiently transferred into the coolant. Conversely, when the thickness of the first wall or the thickness of the second wall is too small relative to the height of the flow channel 10c, the flow rate of the coolant in the flow channel 10c may be insufficient, and the first cold plate 10 cannot provide sufficient cooling for the battery 20. Therefore, in some embodiments, the first thickness dimension and the height dimension can satisfy: 0.02≤H1 / H3≤5, for example, H1 / H3 can be 0.02, 0.2, 2, 5, etc.; the second thickness dimension and the height dimension can satisfy: 0.02≤H2 / H3≤5, for example, H2 / H3 can be 0.02, 0.2, 2, 5, etc.

[0064] In one embodiment, referring to Figure 5, the lateral dimension of the second cold plate 30 perpendicular to its own extension direction is called the first width dimension D1. The electrical connector 22 has a first heat exchange surface in contact with the second cold plate 30, and the dimension of the first heat exchange surface in the same direction as the first width dimension is called the second width dimension D2. In some embodiments, the first width dimension and the second width dimension satisfy: 0.8 ≤ D1 / D2 ≤ 1.2, for example, D1 / D2 can be 0.8, 1.0, 1.2, etc.

[0065] Specifically, when the first width dimension of the second cold plate 30 is too small compared to the second width dimension of the electrical connector 22, the second cold plate 30 absorbs less heat, which may result in insufficient heat exchange effect of the second cold plate 30. Conversely, when the second width dimension of the electrical connector 22 is too small compared to the first width dimension of the second cold plate 30, part of the structure of the second cold plate 30 does not fully participate in heat exchange, resulting in low utilization rate of the second cold plate 30. Therefore, the first width dimension and the second width dimension satisfy: 0.8≤D1 / D2≤1.2, which can better ensure sufficient heat exchange between the electrical connector 22 and the second cold plate 30.

[0066] In one embodiment, referring to FIG6, the battery cell 21 has a first length dimension D3 along its own length direction and a third width dimension D4 along the width direction perpendicular to the length direction, and the electrode post 211 has a second length dimension D5 along the length direction and a fourth width dimension D6 along the width direction.

[0067] When the volume of the electrode post 211 is relatively small compared to the volume of the battery cell 21, the heat conduction of the electrode post 211 is insufficient, which may lead to insufficient heat exchange effect of the second cold plate 30. Conversely, when the volume of the electrode post 211 is relatively large compared to the volume of the battery cell 21, it is not convenient to install the second cold plate 30 on the battery cell 21. Therefore, in some embodiments, the first length dimension and the second length dimension satisfy: 0.1≤D5 / D3≤0.4, for example, D5 / D3 can be 0.1, 0.2, 0.3, 0.4, etc., and the third width dimension and the fourth width dimension satisfy: 0.1≤D6 / D4≤0.99, for example, D6 / D4 can be 0.1, 0.5, 0.8, 0.99, etc.

[0068] In one embodiment, referring to Figures 1 and 7, the area of ​​the bottom surface 21a of a single battery cell 21 facing the first cold plate 10 is S1, and the heat exchange area between the bottom surface 21a and the first cold plate 10 (i.e., the area of ​​the region with the cross-section line in the figure) is S2. For a battery pack where the first cold plate 10 and the battery cell 21 are in direct contact, the heat exchange area of ​​the bottom surface 21a of the battery cell 21 refers to the area of ​​the bottom surface 21a in direct contact with the first cold plate 10. For a battery pack where a heat exchange medium such as a thermal pad, thermal adhesive, or structural adhesive is provided between the first cold plate 10 and the battery cell 21, the heat exchange area of ​​the bottom surface 21a of the battery cell 21 refers to the area of ​​the bottom surface 21a in direct contact with the heat exchange medium. To ensure good heat exchange between a single battery cell 21 and the first cold plate 10, the heat exchange area S2 between the bottom surface 21a and the first cold plate 10, relative to the area S1 of the bottom surface 21a of the single battery cell 21 facing the first cold plate 10, cannot be too small. In some embodiments, S1 and S2 satisfy: 0.1 ≤ S2 / S1 ≤ 1, for example, S2 / S1 can be 0.1, 0.3, 0.6, 1, etc.

[0069] In one embodiment, referring to FIG1, multiple battery cells 21 can be arranged in multiple rows along a first direction and in multiple columns along a second direction perpendicular to the first direction. In an embodiment where there are multiple second cold plates 30, the multiple second cold plates 30 are arranged along the second direction so that each second cold plate 30 can cool the battery cells 21 in the same column.

[0070] In some other embodiments, referring to FIG9, a plurality of second cold plates 30 may also be arranged along a first direction so that each second cold plate 30 can cool the battery cells 21 in the same row.

[0071] Please refer to Figures 1 and 3. There can be multiple electrical connectors 22. Taking multiple second cold plates 30 arranged along the second direction as an example, each electrical connector 22 connects to two adjacent battery cells 21 along the first direction. The electrical connectors 22 of battery cells 21 arranged in two adjacent columns can be thermally connected to the same second cold plate 30. In other words, the same second cold plate 30 can cool two adjacent columns of battery cells 21.

[0072] In some embodiments, please refer to Figures 3 and 4. The electrical connector 22 may be provided with a connecting portion 222 and a heat-conducting portion 221 located on one side of the connecting portion 222. The connecting portion 222 is connected to the terminal post 211 of the battery cell 21, and the second cold plate 30 is connected to the heat-conducting portion 221.

[0073] Specifically, the connecting part 222 is connected to the pole post 211 of two adjacent battery cells 21 respectively, and the heat-conducting part 221 can transfer the heat of the battery cell 21 to the second cold plate 30.

[0074] Please refer to Figures 3 and 4. The connecting part 222 may also include a bending section 2222 and two connecting sections 2221. The two connecting sections 2221 are located on opposite sides of the bending section 2222 and are respectively connected to the pole post 211 of two adjacent battery cells 21. The number of heat-conducting parts 221 can be two, and the heat-conducting parts 221 are connected to the connecting sections 2221 one by one.

[0075] The bending section 2222 is the bent part on the electrical connector 22. By setting the bending section 2222 between the two connecting sections 2221, the connecting part 2221 can be easily connected to the corresponding battery cell 21.

[0076] In some embodiments, referring to FIG3, the second cold plate 30 may be located on the side of the heat-conducting part 221 close to the first cold plate 10. That is, the second cold plate 30 is disposed between the heat-conducting part 221 and the battery cell 21.

[0077] The heat-conducting part 221 can provide a certain degree of support to the second cold plate 30 on the side of the second cold plate 30 away from the first cold plate 10, thereby improving the stability of the installation of the second cold plate 30.

[0078] In addition, the side of the second cold plate 30 away from the heat-conducting part 221 can also contact the battery cell 21. The second cold plate 30 can be sandwiched between the heat-conducting part 221 and the battery cell 21. This not only further improves the installation stability of the second cold plate 30, but also allows the second cold plate 30 and the battery cell 21 to directly exchange heat, thereby increasing the heat exchange efficiency between the second cold plate 30 and the battery cell 21.

[0079] In other embodiments, the second cold plate 30 may also be disposed on the side of the heat-conducting portion 221 away from the first cold plate 10.

[0080] In other embodiments, the electrical connector 22 may not have a heat-conducting part 221. For example, referring to Figure 5, the second cold plate 30 may be provided on the side of the electrical connector 22 away from the pole post 211 of the battery cell 21.

[0081] In the description of this disclosure, references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this disclosure. In this disclosure, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine the different embodiments or examples described in this disclosure and the features of the different embodiments or examples without contradiction.

[0082] The above description is merely an embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure are included within the scope of protection of this disclosure.

Claims

1. A cooling device, characterized in that, include: First cold plate; The second cold plate is spaced apart from the first cold plate so that the space between them forms a receiving space; The first cold plate and the second cold plate are in fluid communication through the connecting pipe.

2. The cooling device according to claim 1, characterized in that, The cooling device includes a plurality of second cold plates, each of which is fluidly connected through the connecting pipe, and at least some of the second cold plates are connected in parallel.

3. The cooling device according to claim 1 or 2, characterized in that, The first cold plate has a liquid inlet, a liquid outlet, a diversion port, and a return port. The liquid inlet is in fluid communication with the diversion port, the return port is in fluid communication with the liquid outlet, and the connecting pipe is in fluid communication with the diversion port and the return port, respectively.

4. The cooling device according to claim 3, characterized in that, The number of the second cold plates is not less than three. The connecting pipe includes a connecting pipe, a branch pipe in fluid communication with the branch port, and a return pipe in fluid communication with the return port. The first end of each second cold plate is in fluid communication with the same connecting pipe. The second end of a portion of the second cold plates opposite to the first end is in fluid communication with the same branch pipe. The second end of another portion of the second cold plates is in fluid communication with the return pipe.

5. The cooling device according to claim 1 or 2, characterized in that, The accommodating space is used to accommodate the battery. The first cold plate includes a first wall and a second wall, and a flow channel is formed between the first wall and the second wall. The battery is located on the side of the first wall away from the second wall. The first wall and the second wall respectively have a first thickness dimension H1 and a second thickness dimension H2 along the thickness direction of the first cold plate, and the flow channel has a height dimension H3 along the thickness direction. The first thickness dimension and the height dimension satisfy: 0.02 ≤ H1 / H3 ≤ 5; and / or, The second thickness dimension and the height dimension satisfy the following condition: 0.02≤H2 / H3≤5.

6. A battery pack, characterized in that, The device includes a battery and a cooling device according to any one of claims 1 to 5, wherein the battery is disposed in the receiving space, the battery includes a plurality of individual cells having terminals and an electrical connector connecting the terminals of each individual cell, the side of each individual cell facing away from the terminal is thermally connected to the first cold plate, and the second cold plate is thermally connected to the electrical connector.

7. The battery pack according to claim 6, characterized in that, Multiple battery cells are arranged in multiple rows along a first direction and in multiple columns along a second direction perpendicular to the first direction; The number of the second cold plates is multiple, and the multiple second cold plates are arranged along the second direction or the first direction.

8. The battery pack according to claim 7, characterized in that, The number of electrical connectors is multiple, and each electrical connector is connected to two adjacent battery cells along the first direction. Multiple second cold plates are arranged along the second direction, and the electrical connectors of the battery cells arranged in two adjacent columns are thermally connected to the same second cold plate.

9. The battery pack according to claim 6, 7, or 8, characterized in that, The electrical connector includes a connecting portion and a heat-conducting portion located on one side of the connecting portion. The connecting portion is connected to the terminal of the battery cell, and the second cold plate is connected to the heat-conducting portion.

10. The battery pack according to claim 9, characterized in that, The second cold plate is located on the side of the heat-conducting part closer to the first cold plate.

11. The battery pack according to claim 10, characterized in that, The side of the second cold plate away from the heat-conducting part contacts the battery cell.

12. The battery pack according to any one of claims 9 to 11, characterized in that, The number of electrical connectors is multiple, and each electrical connector is connected to two adjacent battery cells. The connection part includes a bending section and two connection sections, which are located on opposite sides of the bending section and are respectively connected to the poles of the two adjacent battery cells. The number of thermally conductive parts is two, and the thermally conductive parts are connected to the connection sections one by one.

13. The battery pack according to any one of claims 6 to 12, characterized in that, The second cold plate has a first width dimension D1 in the lateral direction perpendicular to its extension direction. The electrical connector has a first heat exchange surface that exchanges heat with the second cold plate. The first heat exchange surface has a second width dimension D2 in the same direction as the first width dimension. The first width dimension and the second width dimension satisfy: 0.8≤D1 / D2≤1.

2.

14. The battery pack according to any one of claims 6 to 13, characterized in that, The battery cell has a first length dimension D3 along its own length direction and a third width dimension D4 along a width direction perpendicular to the length direction; the terminal post has a second length dimension D5 along the length direction and a fourth width dimension D6 along the width direction; the first length dimension and the second length dimension satisfy: 0.1≤D5 / D3≤0.4, and the third width dimension and the fourth width dimension satisfy: 0.1≤D6 / D4≤0.99; and / or, The area S1 of the bottom surface of a single battery cell facing the first cold plate and the heat exchange area S2 between the bottom surface and the first cold plate satisfy: 0.1≤S2 / S1≤1.

15. A vehicle, characterized in that, The battery pack includes any one of claims 6 to 14.

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