Cooling device, battery pack and vehicle

Abstract

The embodiment of the utility model provides a cooling device, a battery pack and a vehicle, and the cooling device comprises a first cold plate, a second cold plate and a connecting pipeline. The second cold plate and the first cold plate are arranged at an interval, so that an accommodating space is formed at the interval, and the first cold plate and the second cold plate are in fluid communication through the connecting pipeline. The cooling device provided by the embodiment of the utility model has relatively high cooling capacity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a cooling device, a battery pack and a vehicle. BACKGROUND

[0002] The power battery generates heat during the charging process. When the current passing through the battery cell is larger, the heat generated is larger, and the temperature is higher. In the related technology, the power battery usually uses a active liquid cooling device to cool the battery cell, that is, the cooling liquid is circulated in the internal of the liquid cooling plate to take away the heat generated by the battery cell.

[0003] However, the flow direction of the cooling liquid is usually along the arrangement direction of the battery cell. After the cooling liquid flows through multiple battery cells, the temperature of the cooling liquid rises rapidly, which causes the battery cell at the end of the cooling liquid flow direction to be insufficiently cooled, thereby affecting the cooling capacity of the power battery. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the embodiments of the present application aim to provide a cooling device, a battery pack and a vehicle with strong cooling capacity.

[0005] To achieve the above-mentioned purpose, an embodiment of the present application provides a cooling device, comprising:

[0006] a first cold plate;

[0007] a second cold plate, the second cold plate is arranged in a spaced manner with the first cold plate to form an accommodation space at the interval;

[0008] a connecting pipeline, the first cold plate and the second cold plate are in fluid communication through the connecting pipeline. In an embodiment, the cooling device comprises multiple second cold plates, each second cold plate is in fluid communication through the connecting pipeline, and at least part of the second cold plates are connected in parallel.

[0009] In an embodiment, the first cold plate has an inlet, an outlet, a shunt port and a return port, the inlet is in fluid communication with the shunt port, the return port is in fluid communication with the outlet, and the connecting pipeline is in fluid communication with the shunt port and the return port respectively.

[0010] In an embodiment, the number of the second cold plates is not less than three, the connecting pipeline comprises a connecting pipe, a shunt pipe in fluid communication with the shunt 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, a part of the second cold plates has a second end opposite to the first end and in fluid communication with the same shunt pipe, and the second end of another part of the second cold plates is in fluid communication with the return pipe.

[0011] In one embodiment, the first cold plate comprises a first wall body and a second wall body, a flow channel is formed between the first wall body and the second wall body, and a side of the first wall body away from the second wall body is configured to accommodate a battery; the first wall body and the second wall body have a first thickness dimension H1 and a second thickness dimension H2 along a thickness direction of the first cold plate, respectively, and the flow channel has a height dimension H3 along the thickness direction;

[0012] The first thickness dimension and the height dimension satisfy: 0.02≤H1 / H3≤5; and / or,

[0013] The second thickness dimension and the height dimension satisfy: 0.02≤H2 / H3≤5.

[0014] Another embodiment of the present application provides a battery pack comprising a battery and the cooling device described above, the battery is arranged in the accommodation space, the battery comprises a plurality of battery cells each having a pole and an electrical connector connecting the poles of the battery cells, and a side of each battery cell away from the pole is in thermal contact with the first cold plate, and the second cold plate is in thermal contact with the electrical connector.

[0015] In one embodiment, the plurality of battery cells are arranged in multiple rows along a first direction and in multiple columns along a second direction perpendicular to the first direction.

[0016] The number of the second cold plates is multiple, and the plurality of second cold plates are arranged along the second direction or the first direction.

[0017] In one embodiment, the number of the electrical connectors is multiple, each electrical connector connects two adjacent battery cells along the first direction, the plurality of second cold plates are arranged along the second direction, and the electrical connectors of the battery cells in adjacent columns are in thermal contact with the same second cold plate.

[0018] In one embodiment, the electrical connector comprises a connecting portion and a thermal conduction portion on one side of the connecting portion, the connecting portion is connected to the pole of the battery cell, and the second cold plate is connected to the thermal conduction portion.

[0019] In one embodiment, the second cold plate is located on a side of the thermal conduction portion close to the first cold plate.

[0020] In one embodiment, a side of the second cold plate away from the thermal conduction portion is in contact with the battery cell.

[0021] In one embodiment, the number of the electrical connectors is multiple, each of the electrical connectors is connected to two adjacent battery monomers; the connecting part comprises a bending section and two connecting sections, the two connecting sections are located on opposite sides of the bending section and are connected to the pole columns of the two adjacent battery monomers, respectively, and the number of the heat-conducting parts is two, and the heat-conducting parts are connected to the connecting sections one by one.

[0022] In one embodiment, the second cold plate has a first width size D1 in a transverse direction perpendicular to the extension direction of the second cold plate, the electrical connector has a first heat exchange surface for heat exchange with the second cold plate, the first heat exchange surface has a second width size D2 in the same direction as the first width size, and the first width size and the second width size satisfy: 0.8≤D1 / D2≤1.2.

[0023] In one embodiment, the battery monomer has a first length size D3 along a length direction of the battery monomer and a third width size D4 along a width direction perpendicular to the length direction, the pole column has a second length size D5 along the length direction and a fourth width size D6 along the width direction; the first length size and the second length size satisfy: 0.1≤D5 / D3≤0.4, and the third width size and the fourth width size satisfy: 0.1≤D6 / D4≤0.99; and / or,

[0024] In one embodiment, the area S1 of a single battery monomer towards the bottom surface of 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.

[0025] Another embodiment of the present application provides a vehicle comprising the battery pack.

[0026] The embodiment of the present application provides a cooling device, which comprises a first cold plate, a second cold plate and a connecting pipeline, the second cold plate is arranged in a spaced manner with the first cold plate to form an accommodation space at the spacing, and the first cold plate and the second cold plate are in fluid communication through the connecting pipeline. By arranging the battery in the accommodation space and the cooling liquid flowing in the interiors of the first cold plate and the second cold plate, the heat generated by the battery can be taken away, so that the cooling capacity of the battery can be improved, the battery can achieve better heat dissipation, and then the service life of the battery can be prolonged and the safety of the battery can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 FIG. 1 is a structural schematic diagram of a battery pack according to an embodiment of the present application;

[0028] Figure 2 FIG. 1 is a structural schematic diagram of a battery pack according to an embodiment of the present application; Figure 1A first cold plate, a second cold plate and a connection pipeline are connected as shown in the schematic view, and the straight arrow in the figure represents the flow direction of the cooling liquid.

[0029] Figure 3 A first cold plate, a second cold plate and a connection pipeline are connected as shown in the schematic view, and the straight arrow in the figure represents the flow direction of the cooling liquid. Figure 1 A partial structure schematic view of a battery pack is shown.

[0030] Figure 4 A first cold plate, a second cold plate and a connection pipeline are connected as shown in the schematic view, and the straight arrow in the figure represents the flow direction of the cooling liquid. Figure 3 A structure schematic view of an electrical connector is shown.

[0031] Figure 5 A partial structure schematic view of a second battery pack of the embodiment of the present application is shown.

[0032] Figure 6 A structure schematic view of an electrical connector is shown. Figure 1 A structure schematic view of an electrical connector is shown.

[0033] Figure 7 A structure schematic view of an electrical connector is shown. Figure 6 A structure schematic view of an electrical connector is shown, and the area with cross-section lines in the figure represents the area corresponding to the heat exchange area.

[0034] Figure 8 A structure schematic view of an electrical connector is shown. Figure 1 A partial structure schematic view of a first cold plate is shown.

[0035] Figure 9 A structure schematic view of a third battery pack of the embodiment of the present application is shown.

[0036] Explanation of reference signs

[0037] 10, first cold plate; 10a, shunt port; 10b, return port; 10c, flow channel; 10d, liquid inlet; 10e, liquid outlet; 11, first wall body; 12, second wall body; 20, battery; 21, electrical cell; 21a, bottom surface; 211, pole; 22, electrical connector; 221, heat conduction part; 222, connecting part; 2221, connecting section; 2222, bending section; 30, second cold plate; 40, connection pipeline; 41, connection pipe; 42, shunt pipe; 43, return pipe. DETAILED DESCRIPTION

[0038] In the description of the embodiments of the present application, it should be noted that the terms "first direction", "second direction" and the like indicate the orientation or positional relationship based on the drawings of the accompanying drawings. Figure 1 The orientation terms are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the embodiments of the present application.

[0039] The embodiments of the present application provide a battery pack, please refer to Figure 1 、 Figure 3 and Figure 4 , the battery pack comprises a battery 20 and a cooling device.

[0040] The cooling device comprises a first cold plate 10, a second cold plate 30 and a connecting pipeline 40, the second cold plate 30 is arranged in a spaced manner with the first cold plate 10, so that a containing space is formed at the interval, and the first cold plate 10 and the second cold plate 30 are in fluid communication through the connecting pipeline. The first cold plate 10 and the second cold plate 30 are both liquid cooling plates, the battery 20 is arranged in the containing space, and the cooling liquid flows in the interiors of the first cold plate 10 and the second cold plate 30 to take away the heat generated by the battery 20.

[0041] The battery 20 comprises a plurality of battery monomers 21 with poles 211 and an electrical connector 22 connecting the poles 211 of the battery monomers 21, and the side of each battery monomer 21 away from the pole 211 is in thermal conductive connection with the first cold plate 10. The second cold plate 30 is in thermal conductive connection with the electrical connector 22.

[0042] Please refer to Figure 1 、 Figures 3 to 6 , the pole 211 of the battery monomer 21 comprises at least one positive pole and at least one negative pole, Figure 1 the electrical connector 22 connects the positive pole of one battery monomer 21 and the negative pole of another battery monomer 21, so that the plurality of battery monomers 21 are connected in series through the electrical connector 22 to form the battery 20.

[0043] In other embodiments, the plurality of battery monomers 21 can also be connected in parallel or in mixed connection through the electrical connector 22 to form the battery 20.

[0044] The electrical connector 22 and the pole 211 can be connected through various thermal conductive connection modes such as welding, screwing, riveting, conductive glue bonding, etc.

[0045] The first cold plate 10 can be in direct contact with the battery monomer 21, and a heat exchange medium such as a thermal conductive pad, a thermal conductive glue, a structural glue, etc. can also be arranged between the first cold plate 10 and the battery monomer 21.

[0046] The second cold plate 30 can be in direct contact with the electrical connector 22, and a heat exchange medium such as a thermal conductive pad, a thermal conductive glue, a structural glue, etc. can also be arranged between the second cold plate 30 and the electrical connector 22.

[0047] The surfaces of the first cold plate 10 and the second cold plate 30 can be provided with insulating materials or can not be provided with insulating materials.

[0048] On the side of the battery monomer 21 away from the pole 211, the first cold plate 10 in thermal conductive connection with each battery monomer 21 cools the battery monomer 21 by absorbing the heat of the battery monomer 21.

[0049] The electric connection 22 transmits the heat of the electric cell monomer 21 to the second cold plate 30 on the side of the electric cell monomer 21 with the pole 211, so that the second cold plate 30 in heat conduction connection with the electric connection 22 cools the electric cell monomer 21 by absorbing the heat transmitted by the electric connection 22.

[0050] That is, the battery pack of the embodiment of the application cools the battery 20 in the cooling device with the first cold plate 10 and the second cold plate 30, and the first cold plate 10 and the second cold plate 30 jointly absorb the heat generated by the plurality of electric cell monomers 21, so that the cooling capacity of the battery 20 can be improved, the battery 20 can be better cooled, and the service life of the battery 20 can be prolonged and the safety of the battery 20 can be improved.

[0051] Another embodiment of the application provides a vehicle comprising the battery pack of any one of the embodiments of the application.

[0052] In an embodiment, referring to Figure 1 and Figure 2 , the cooling device comprises a plurality of second cold plates 30, each second cold plate 30 can be in fluid communication through the connecting pipeline 40, and at least part of the second cold plates 30 can be connected in parallel, that is, part of the second cold plates 30 can be connected in parallel to the connecting pipeline 40, or all the second cold plates 30 can be connected in parallel to the connecting pipeline 40.

[0053] The advantage of connecting the second cold plates 30 in parallel is that the cooling liquid can be dispersed into the parallel connected second cold plates 30, so that the flow path of the cooling liquid can be effectively prevented from being too long to reduce the cooling effect of the second cold plate 30.

[0054] Referring to Figure 2 , the first cold plate 10 has a shunt port 10a, a return port 10b, a liquid inlet port 10d and a liquid outlet port 10e, and the cooling liquid enters and exits the first cold plate 10 through the liquid inlet port 10d and the liquid outlet port 10e respectively.

[0055] Figure 2 Each second cold plate 30 in communicates with the liquid inlet port 10d and the liquid outlet port 10e through the connecting pipeline 40, that is, part of the cooling liquid entering the first cold plate 10 from the liquid inlet port 10d flows in the first cold plate 10 and flows out from the liquid outlet port 10e of the first cold plate 10, and another part of the cooling liquid can flow from the first cold plate 10 into the second cold plate 30, and the cooling liquid flowing into the second cold plate 30 also flows out from the liquid outlet port 10e of the first cold plate 10, which is equivalent to that the cooling liquid in the first cold plate 10 and the second cold plate 30 shares the liquid inlet port 10d and the liquid outlet port 10e of the first cold plate 10.

[0056] In other embodiments, the connecting pipeline 40 can also be provided with independent inlets and outlets, that is, the cooling liquid directly flows into the connecting pipeline 40 from the inlet of the connecting pipeline 40 and flows out from the outlet of the connecting pipeline 40 without passing through the first cold plate 10.

[0057] For further reference Figure 2 For the cooling device with the number of second cold plates 30 greater than three, the connecting pipeline 40 can include a connecting pipe 41, a shunt pipe 42 in fluid communication with the shunt 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 part of the second cold plates 30 opposite to the first end is in fluid communication with the same shunt pipe 42, that is, the number of second cold plates 30 in fluid communication with the same shunt pipe 42 is at least two, and the second cold plates 30 in fluid communication with the same shunt pipe 42 are connected in parallel through the shunt pipe 42. The second end of another part of the second cold plates 30 is in one-to-one fluid communication with the return pipe 43, and the number of second cold plates 30 in one-to-one fluid communication with the return pipe 43 can be one or more than one.

[0058] Specifically, the cooling liquid first flows into the second cold plates 30 in fluid communication with the shunt pipe 42 through the shunt pipe 42, and then flows into other second cold plates 30 through the connecting pipe 41, and then flows out from the return pipe 43 corresponding to the other second cold plates 30.

[0059] The connecting pipe 41 and the shunt pipe 42 cooperate to enable the cooling liquid to flow more dispersedly into different second cold plates 30, thereby significantly reducing the temperature difference between different cell monomers 21, especially the temperature difference between cell monomers 21 located at opposite ends of each second cold plate 30, and further improving the cooling effect of the battery pack.

[0060] In an embodiment, for further reference Figure 8 The first cold plate 10 includes a first wall body 11 and a second wall body 12, and a flow channel 10c is formed between the first wall body 11 and the second wall body 12, the battery 20 is located on the side of the first wall body 11 away from the second wall body 12, and the cooling liquid flows in the flow channel 10c.

[0061] For further reference Figure 8 The first wall body 11 and the second wall body 12 respectively have a first thickness dimension H1 and a second thickness dimension H2 along the thickness direction of the first cold plate 10, and the flow channel 10c has a height dimension H3 along the thickness direction.

[0062] When the thickness of the first wall body or the thickness of the second wall body is too large relative to the thickness of the flow channel 10c, the heat conduction performance of the first cold plate 10 can be affected, and the heat of the battery 20 cannot be efficiently introduced into the cooling liquid. When the thickness of the first wall body or the thickness of the second wall body is too small relative to the thickness of the flow channel 10c, the flow of the cooling liquid in the flow channel 10c can be insufficient, and the first cold plate 10 cannot provide sufficient cooling effect for the battery 20. Therefore, preferably, the first thickness size and the height size satisfy 0.02≤H1 / H3≤5, for example, H1 / H3 can be 0.02, 0.2, 2, 5, etc.; the second thickness size and the height size satisfy 0.02≤H2 / H3≤5, for example, H2 / H3 can be 0.02, 0.2, 2, 5, etc.

[0063] In an embodiment, referring to Figure 5 , the second cold plate 30 has a first width size D1 in the transverse direction perpendicular to the extension direction of the second cold plate 30, and the electrical connecting piece 22 has a first heat exchange surface in contact with the second cold plate 30, and the first heat exchange surface has a second width size D2 in the same direction as the first width size, and preferably, the first width size and the second width size satisfy 0.8≤D1 / D2≤1.2, for example, D1 / D2 can be 0.8, 1.0, 1.2, etc.

[0064] Specifically, when the first width size of the second cold plate 30 is too small relative to the second width size of the electrical connecting piece 22, the second cold plate 30 absorbs less heat, which can result in insufficient heat exchange effect of the second cold plate 30. When the second width size of the electrical connecting piece 22 is too small relative to the first width size 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 size and the second width size satisfy 0.8≤D1 / D2≤1.2, which can better ensure that the electrical connecting piece 22 and the second cold plate 30 can fully exchange heat.

[0065] In an embodiment, referring to Figure 6 , the battery cell 21 has a first length size D3 along the length direction and a third width size D4 along the width direction perpendicular to the length direction, and the pole 211 has a second length size D5 along the length direction and a fourth width size D6 along the width direction.

[0066] When the volume of the pole 211 is small relative to the volume of the battery cell 21, the heat conduction of the pole 211 is insufficient, which can result in insufficient heat exchange of the second cold plate 30, and when the volume of the pole 211 is large relative 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, preferably, 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.

[0067] In an embodiment, referring to Figure 1 and Figure 7 , the area of the bottom surface 21a of the single battery cell 21 facing the first cold plate 10 is S1, and the heat exchange area of 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 in which the first cold plate 10 directly contacts the battery cell 21, the heat exchange area of the bottom surface 21a of the battery cell 21 refers to the area of the region where the bottom surface 21a directly contacts the first cold plate 10. For a battery pack in which a heat exchange medium such as a heat-conducting pad, heat-conducting glue, or structural glue is arranged 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 region where the bottom surface 21a directly contacts the heat exchange medium. To ensure that the single battery cell 21 can better exchange heat with the first cold plate 10, the heat exchange area S2 of the bottom surface 21a and the first cold plate 10 cannot be too small relative to the area S1 of the bottom surface 21a of the single battery cell 21 facing the first cold plate 10. Preferably, S1 and S2 satisfy: 0.1≤S2 / S1≤1, for example, S2 / S1 can be 0.1, 0.3, 0.6, 1, etc.

[0068] In an embodiment, referring to Figure 1 , the plurality of 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 embodiments in which the number of second cold plates 30 is multiple, the plurality of 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 row.

[0069] In other embodiments, referring to Figure 9 , the plurality of second cold plates 30 can also be arranged along the first direction, so that each second cold plate 30 can cool the battery cells 21 in the same column.

[0070] Please continue to refer to Figure 1 and Figure 3The number of the electric connecting pieces 22 can be multiple. For example, multiple second cold plates 30 are arranged in the second direction, each electric connecting piece 22 connects two adjacent electric monomers 21 in the first direction, and the electric connecting pieces 22 arranged in the adjacent two rows of electric monomers 21 can be in thermal connection with the same second cold plate 30. That is, the same second cold plate 30 can cool the adjacent two rows of electric monomers 21.

[0071] For example, referring to Figure 3 and Figure 4 The electric connecting piece 22 can be provided with a connecting part 222 and a thermal conduction part 221 located on one side of the connecting part 222, the connecting part 222 is connected with the pole 211 of the electric monomer 21, and the second cold plate 30 is connected with the thermal conduction part 221.

[0072] Specifically, the connecting part 222 connects the poles 211 of two adjacent electric monomers 21 respectively, and the thermal conduction part 221 can transfer the heat of the electric monomer 21 to the second cold plate 30.

[0073] For example, referring to Figure 3 and Figure 4 The connecting part 222 can further include a bending section 2222 and two connecting sections 2221, the two connecting sections 2221 are located on the opposite sides of the bending section 2222 respectively, and are connected with the poles 211 of the adjacent two electric monomers 21 respectively, and the number of the thermal conduction parts 221 can be two, and the thermal conduction parts 221 are connected with the connecting sections 2221 one by one.

[0074] The bending section 2222 is a bending part on the electric connecting piece 22, and the connecting part 222 can facilitate the connection between the connecting section 2221 and the corresponding electric monomer 21 by arranging the bending section 2222 between the two connecting sections 2221.

[0075] For example, referring to Figure 3 The second cold plate 30 can be located on the side of the thermal conduction part 221 close to the first cold plate 10. That is, the second cold plate 30 is arranged between the thermal conduction part 221 and the electric monomer 21.

[0076] The thermal conduction part 221 can play a certain stopping role on the second cold plate 30 on the side away from the first cold plate 10, so as to improve the stability of the installation of the second cold plate 30.

[0077] In addition, the side of the second cold plate 30 away from the thermal conduction part 221 can also be in contact with the electric monomer 21, and the second cold plate 30 can be clamped between the thermal conduction part 221 and the electric monomer 21. Therefore, not only can the stability of the installation of the second cold plate 30 be further improved, but also the second cold plate 30 and the electric monomer 21 can directly exchange heat, thereby improving the heat exchange efficiency between the second cold plate 30 and the electric monomer 21.

[0078] In some other embodiments, the second cold plate 30 can also be arranged on the side of the heat-conducting part 221 away from the first cold plate 10.

[0079] In some other embodiments, the electric connecting piece 22 can also not be provided with the heat-conducting part 221, for example, refer to Figure 5 The second cold plate 30 can be arranged on the side of the electric connecting piece 22 away from the pole 211 of the electric cell monomer 21.

[0080] In the description of the present application, the description of the terms "in an embodiment", "in some embodiments", "in some other embodiments", "in yet some embodiments", or "exemplary" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the exemplary description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the skilled in the art can combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0081] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application is included in the protection scope of the present application.

Claims

1. Cooling device, characterized in that The application relates to a cooling device for a battery. The cooling device comprises: a first cold plate; a second cold plate, which is spaced apart from the first cold plate to form a containing space at the spacing; 2. Cooling device according to claim 1, characterized in that a connecting pipeline, through which the first cold plate and the second cold plate are in fluid communication.

3. Cooling device according to claim 1 or 2, characterized in that The cooling device comprises a plurality of the second cold plates, each of which is in fluid communication through the connecting pipeline, and at least part of the second cold plates are connected in parallel.

4. Cooling device according to claim 3, characterized in that The first cold plate has an inlet, an outlet, a branch port and a return port, the inlet is in fluid communication with the branch port, the return port is in fluid communication with the outlet, and the connecting pipeline is in fluid communication with the branch port and the return port respectively.

5. Cooling device according to claim 1 or 2, characterized in that The number of the second cold plates is not less than three, the connecting pipeline comprises a connecting pipeline, a branch pipeline in fluid communication with the branch port and a return pipeline in fluid communication with the return port, the first end of each of the second cold plates is in fluid communication with the same connecting pipeline, a part of the second cold plates are in fluid communication with the same branch pipeline at the second end opposite to the first end, and the second end of another part of the second cold plates is in fluid communication with the return pipeline. The first cold plate comprises a first wall body and a second wall body, a flow channel is formed between the first wall body and the second wall body, and the side of the first wall body away from the second wall body is used for arranging a battery; the first wall body and the second wall body have a first thickness dimension H1 and a second thickness dimension H2 along the thickness direction of the first cold plate respectively, 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, 6. A battery pack, characterized by, The second thickness dimension and the height dimension satisfy 0.02<=H2 / H3<=5.

7. The battery pack of claim 6, wherein, The application further relates to a battery and the cooling device. A plurality of the battery monomers are arranged into multiple rows along a first direction and multiple columns along a second direction perpendicular to the first direction.

8. The battery pack of claim 7, wherein, 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.

9. The battery pack of claim 7 or 8, wherein, The number of the electric connection members is multiple, each of the electric connection members is connected with two adjacent battery monomers along the first direction, the multiple second cold plates are arranged along the second direction, and the electric connection members of the battery monomers in two adjacent columns are in thermal contact with the same second cold plate.

10. The battery pack of claim 9, wherein, The electric connection member comprises a connecting part and a thermal conduction part on one side of the connecting part, the connecting part is connected with the pole of the battery monomer, and the second cold plate is connected with the thermal conduction part.

11. The battery pack of claim 10, wherein, The second cold plate is located on the side of the thermal conduction part close to the first cold plate. The side of the second cold plate away from the thermal conduction part is in contact with the battery monomer.

12. The battery pack of claim 9, wherein, The number of the electric connectors is multiple, each of the electric connectors is connected with two adjacent battery monomers; the connecting part comprises a bending section and two connecting sections, the two connecting sections are respectively located on the opposite sides of the bending section, and are respectively connected with the pole of the two adjacent battery monomers, the number of the heat conducting part is two, and the heat conducting part is connected with the connecting section one by one.

13. The battery pack of claim 7 or 8, wherein, The second cold plate has a first width size D1 in the transverse direction perpendicular to the extension direction of the second cold plate, the electric connector has a first heat exchange surface in heat exchange with the second cold plate, the first heat exchange surface has a second width size D2 in the same direction as the first width size, and the first width size and the second width size satisfy: 0.8≤D1 / D2≤1.

2.

14. The battery pack of claim 6 or 7, wherein, The battery monomer has a first length size D3 along the length direction of the battery monomer and a third width size D4 along the width direction perpendicular to the length direction, the pole has a second length size D5 along the length direction and a fourth width size D6 along the width direction, the first length size and the second length size satisfy: 0.1≤D5 / D3≤0.4, and the third width size and the fourth width size satisfy: 0.1≤D6 / D4≤0.99; and / or, The area S1 of a single battery monomer towards the bottom surface of the first cold plate and the heat exchange area S2 of the bottom surface in heat exchange with the first cold plate satisfy: 0.1≤S2 / S1≤1.

15. A vehicle characterized by comprising: The battery pack comprises the battery pack of any one of claims 6-14. The battery pack comprises the battery pack of any one of claims 6-14.

Images