Cooling device and battery module thereof

Abstract

The utility model provides a cooling device and a battery module thereof, and the cooling device comprises a first cooling piece and a second cooling piece, each of which comprises a first side and a second side which are opposite, the first cooling piece is provided with a first flow channel, and the second cooling piece is provided with a second flow channel; wherein the first side of the first cooling part is fixedly connected to the second side of the second cooling part, a first notch is formed in the first side of the first cooling part, a second notch is formed in the second side of the second cooling part, and the first flow channel is communicated with the second flow channel through the first notch and the second notch. Compared with production of a whole large cooling piece, the cooling device is split into the mode that the first cooling piece and the second cooling piece can be independently produced, the production difficulty can be reduced, and the yield can be increased. And the first cooling piece and the second cooling piece are communicated through the first notch and the second notch, so that the first cooling piece and the second cooling piece are fixedly installed conveniently, the communication mode is simple, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cooling device and a battery module thereof. Background Art

[0002] The cooling plate is an important part of the active heat dissipation system of the energy storage battery. Good temperature control is related to the life of the energy storage battery. The production of the cooling plate first relies on stamping equipment and molds to stamp the aluminum plate to form a flow channel plate, and then it is processed through graphite screen printing, gas blowing, cutting and punching. The processing technology is complicated, which makes it inconvenient to produce cooling plates of corresponding sizes for some large battery modules after integration to achieve cooling and heat dissipation. Utility Model Content

[0003] The embodiments of the utility model provide a cooling device and a battery module thereof, which can reduce the technical problem of difficult processing when producing cooling plates for large battery modules.

[0004] In a first aspect, an embodiment of the present utility model provides a cooling device, comprising:

[0005] The first cooling member and the second cooling member each include a first side and a second side opposite to each other, the first cooling member is provided with a first flow channel, and the second cooling member is provided with a second flow channel;

[0006] Among them, the first side of the first cooling member is fixedly connected to the second side of the second cooling member, the first side of the first cooling member is provided with a first notch, the second side of the second cooling member is provided with a second notch, and the first flow channel is connected to the second flow channel through the first notch and the second notch.

[0007] In one embodiment, the first cooling member includes a first connecting plate and a first plate and a second plate opposite thereto, the first connecting plate being connected between the first plate and the second plate to enclose at least a portion of the first flow channel; the second cooling member includes a second connecting plate and a third plate and a fourth plate opposite thereto, the second connecting plate being connected between the third plate and the fourth plate to enclose at least a portion of the second flow channel; wherein the first notch is provided on the first connecting plate, the second notch is provided on the second connecting plate, and the first connecting plate is fixedly connected to the second connecting plate.

[0008] In one embodiment, the first cooling member further includes a first flow partition, the first flow partition is connected between the first plate and the second plate to divide the first flow channel into a first main flow channel and a second main flow channel, a first flow partition is provided at one end of the first flow partition, and the first main flow channel is connected to the second main flow channel through the first flow partition; the second cooling member further includes a second flow partition, the second flow partition is located between the third plate and the fourth plate and connected to the third plate and the fourth plate to divide the second flow channel into a third main flow channel and a fourth main flow channel, a second flow partition is provided at one end of the second flow partition, and the third main flow channel is connected to the fourth main flow channel through the second flow partition; the first main flow channel and the fourth main flow channel are located on both sides of the second main flow channel and the third main flow channel.

[0009] In one embodiment, the first cooling member further includes a plurality of first diverter plates and a plurality of second diverter plates, the first diverter plates being connected between the first plate and the second plate to divide the first main channel into a plurality of first diverter channels, the second diverter plates being connected between the first plate and the second plate to divide the second main channel into a plurality of second diverter channels; the second cooling member further includes a plurality of third diverter plates and a plurality of fourth diverter plates, the third diverter plates being connected between the third plate and the fourth plate to divide the third main channel into a plurality of third diverter channels, the fourth diverter plates being connected between the third plate and the fourth plate to divide the fourth main channel into a plurality of second diverter channels.

[0010] In one embodiment, two sealing members are further included, wherein the first cooling member and the second cooling member each include a first end and a second end opposite to each other, the first end of the first cooling member and the second end of the first cooling member are each provided with a first opening connected to the first flow channel, the first end of the second cooling member and the second end of the second cooling member are each provided with a second opening connected to the second flow channel, and each of the sealing members seals one first opening and one second opening.

[0011] In one embodiment, the blocking member includes a first blocking member, which is disposed near the first end, and includes a first main body, a first blocking portion disposed on one side of the first main body, and a third flow partition disposed on the other side of the first main body; the third flow partition and the first main body are located inside the first cooling member and the second cooling member and form a fifth main flow channel with the first cooling member and the second cooling member, and both ends of the third flow partition are provided with a communication port, and part of the first branch flow channel and part of the fourth branch flow channel are connected to the fifth main flow channel through the two communication ports;

[0012] And / or, the blocking member includes a second blocking member, which is arranged close to the second end; the second blocking member includes a second main body and a second blocking portion arranged on one side of the second main body, the second main body is located in the first cooling member and the second cooling member, and the second blocking portion blocks a first opening and a second opening located at the second end.

[0013] In one embodiment, a vertical distance between one end of the fourth diverter plate facing the communication port and the third flow partition is smaller than a vertical distance between other ends of the fourth diverter plate and the third flow partition.

[0014] In one embodiment, the distance between one end of the plurality of third diverter plates away from the second opening and one end of the second cooling member away from the second opening shortens as the distance from the second notch increases.

[0015] In one embodiment, it also includes a third cooling member arranged between the first cooling member and the second cooling member, the third cooling member is provided with a third flow channel, the third cooling member includes a first side and a second side opposite to each other, the first side of the third cooling member and the second side of the third cooling member are both provided with a third notch connected to the third flow channel, wherein one of the third notches is connected to the first notch, and the other of the third notches is connected to the second notch.

[0016] In one embodiment, a plurality of third cooling members are connected side by side along a direction from the first cooling member to the second cooling member, and adjacent third cooling members are connected through the third notches. Two third notches of a third cooling member close to the first cooling member are respectively connected to the third notch of an adjacent third cooling member and the first notch, and two third notches of a third cooling member close to the second cooling member are respectively connected to the third notch of an adjacent third cooling member and the second notch.

[0017] In one embodiment, an insulating layer is further provided on the first cooling member and the second cooling member for insulation from the battery module.

[0018] In a second aspect, an embodiment of the utility model provides a battery module, comprising a cooling device as described above, characterized in that it also comprises a battery pack, and the cooling device is used to cool the battery pack.

[0019] Beneficial effects of the embodiments of the utility model:

[0020] In an embodiment of the utility model, the cooling device is split into a first cooling member and a second cooling member that can be produced independently, and the first cooling member and the second cooling member are connected through a first notch and a second notch to adapt to the heat dissipation and cooling of the integrated large battery module, thereby improving the technical problem of the difficulty in producing the cooling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a three-dimensional schematic diagram of the cooling device provided in Example 2 of the utility model.

[0023] Figure 2 It is an exploded view of the cooling device provided in Example 2 of the utility model.

[0024] Figure 3 It is a schematic structural diagram of the first cooling element provided in Example 2 of the utility model.

[0025] Figure 4 It is a schematic structural diagram of the second cooling element provided in Example 2 of the utility model.

[0026] Figure 5 It is a cross-sectional view of the cooling device provided in Example 2 of the utility model.

[0027] Figure 6 It is a schematic diagram of the structure of the cooling device provided in Example 5 of the utility model.

[0028] Figure 7 It is a cross-sectional view of the first blocking member provided in Example 5 of the utility model.

[0029] Figure 8 It is a cross-sectional view of the second blocking member provided in Example 5 of the utility model.

[0030] Fig. 9 It is a cross-sectional view of the cooling device provided in Example 5 of the utility model. Description of the drawings:

[0032] 1. first cooling member; 11. first connecting plate; 111. first notch; 12. first plate; 121. water inlet; 13. second plate; 14. first flow divider; 141. first flow channel outlet; 15. first flow divider; 16. second flow divider; 17. first main flow channel; 18. second main flow channel; 2. second cooling member; 21. second connecting plate; 212. second notch; 22. third plate; 221. water outlet; 23. fourth plate; 24. second flow divider; 241. second flow channel outlet; 25. first Three dividers; 26, fourth divider; 27, third main channel; 28, fourth main channel; 3, first divider; 4, second divider; 5, third divider; 6, fourth divider; 7, plugging piece; 71, first plugging piece; 711, first main body; 712, first plugging part; 713, third flow separator; 714, connecting port; 72, second plugging piece; 721, second main body; 722, second plugging part; 8, fixed crossbeam; 9, hoisting longitudinal beam; 10, receiving groove; 101, fifth main channel. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0034] Example 1

[0035] Reference Figure 1 and Figure 2 , an embodiment of the present application provides a cooling device, comprising:

[0036] The first cooling member 1 and the second cooling member 2 each include a first side and a second side opposite to each other, the first cooling member 1 is provided with a first flow channel, and the second cooling member 2 is provided with a second flow channel;

[0037] Among them, the first side of the first cooling member 1 is fixedly connected to the second side of the second cooling member 2, the first side of the first cooling member 1 is provided with a first notch 111, and the second side of the second cooling member 2 is provided with a second notch 212, and the first flow channel is connected to the second flow channel through the first notch 111 and the second notch 212.

[0038] Compared with producing a whole large cooling member, splitting the cooling device into the first cooling member 1 and the second cooling member 2 to independently produce can reduce the difficulty of production and improve the yield rate. The first cooling member 1 and the second cooling member 2 are connected through the first notch 111 and the second notch 212, which is convenient for fixing and installing the first cooling member 1 and the second cooling member 2, and the connection method is simple and easy to operate.

[0039] Example 2

[0040] Reference Figure 1 and Figure 2 An embodiment of the present application provides a cooling device, including a first cooling member 1, a second cooling member 2 and a blocking member 7.

[0041] Reference Figure 3 , Figure 4 and Figure 5 The first cooling member 1 and the second cooling member 2 each include a first side and a second side opposite to each other. The first cooling member 1 is provided with a first flow channel, and the second cooling member 2 is provided with a second flow channel.

[0042] The first cooling member 1 comprises a first connecting plate 11, a first plate 12, a second plate 13, a first flow partitioning plate 14, a plurality of first flow dividing plates 15 and a plurality of second flow dividing plates 16. The first connecting plate 11 is connected between the first plate 12 and the second plate 13 to enclose at least part of the first flow channel. A first notch 111 is provided on a first side of the first cooling member 1, that is, the first connecting plate 11 is provided with a first notch 111.

[0043] The first flow partition 14 is connected between the first plate 12 and the second plate 13 to separate the first flow channel into a first main flow channel 17 and a second main flow channel 18 . The first flow partition 14 , the first connecting plate 11 , a portion of the first plate 12 and a portion of the second plate 13 form the second main flow channel 18 .

[0044] A plurality of first flow dividers 15 are arranged side by side and connected between the first plate 12 and the second plate 13 to divide the first main flow channel 17 into a plurality of first flow dividers 3, and the plurality of first flow dividers 3 are interconnected at both ends. A plurality of second flow dividers 16 are arranged side by side and connected between the first plate 12 and the second plate 13 to divide the second main flow channel 18 into a plurality of second flow dividers 4, and the plurality of second flow dividers 4 are interconnected at both ends. A first flow channel opening 141 is provided at one end of the first flow divider 14 away from the first notch 111, and the first main flow channel 17 and the second main flow channel 18 are interconnected at the first flow channel opening 141.

[0045] The second cooling member 2 includes a second connecting plate 21, a third plate 22, a fourth plate 23, a second flow partition 24, a plurality of third flow dividers 25 and a plurality of fourth flow dividers 26. The second connecting plate 21 is connected between the third plate 22 and the fourth plate 23 to enclose at least part of the second flow channel. A second notch 212 is provided on the second side of the second cooling member 2, that is, the second connecting plate 21 is provided with the second notch 212. The first flow channel is connected to the second flow channel through the first notch 111 and the second notch 212.

[0046] The second flow partition 24 is connected between the third plate 22 and the fourth plate 23 to separate the second flow channel into a third main flow channel 27 and a fourth main flow channel 28 . The second flow partition 24 , the second connecting plate 21 , a portion of the third plate 22 and a portion of the fourth plate 23 form the third main flow channel 27 .

[0047] A plurality of third flow dividers 25 are arranged side by side and connected between the third plate 22 and the fourth plate 23 to divide the third main flow channel 27 into a plurality of third flow dividers 5, and the plurality of third flow dividers 5 are interconnected at both ends. A plurality of fourth flow dividers 26 are arranged side by side and connected between the third plate 22 and the fourth plate 23 to divide the fourth main flow channel 28 into a plurality of fourth flow dividers 6, and the plurality of fourth flow dividers 6 are interconnected at both ends. A second flow channel opening 241 is provided at one end of the second flow divider 24 away from the second notch 212, and the third main flow channel 27 and the fourth main flow channel 28 are interconnected at the second flow channel opening 241.

[0048] The first flow partition 14, the second flow partition 24, the first flow splitter 15, the second flow splitter 16, the third flow splitter 25 and the fourth flow splitter 26 divide the coolant in the cooling device into different areas, thereby increasing the heat exchange rate inside and outside the cooling device and improving the heat exchange effect.

[0049] The first plate 12 is provided with a water inlet 121 connected to one end of the first main channel 17 away from the first channel opening 141. The third plate 22 is provided with a water outlet 221 connected to one end of the fourth main channel 28 away from the second channel opening 241. The flow direction of the coolant in the first cooling member 1 and the second cooling member 2 is the water inlet 121, the first main channel 17, the first channel opening 141, the second main channel 18, the first notch 111, the second notch 212, the third main channel 27, the second channel opening 241, the fourth main channel 28 and the water outlet 221.

[0050] Reference Figure 5The projection of the virtual line between the ends of the plurality of first manifold plates 15 and the plurality of second manifold plates 16 close to the first flow channel opening 141 in the direction perpendicular to the first plate 12 bulges in the direction away from the first flow channel opening 141. The projection of the virtual line between the ends of the plurality of third manifold plates 25 and the plurality of fourth manifold plates 26 close to the first flow channel opening 141 in the direction perpendicular to the third plate 22 bulges in the direction away from the second flow channel opening 241.

[0051] The distance between the end of the plurality of first splitter plates 15 and the plurality of second splitter plates 16 away from the first flow channel opening 141 and the end of the first cooling member 1 away from the first flow channel opening 141 is shortened as they approach the first splitter plate 14. The distance between the end of the plurality of third splitter plates 25 and the plurality of fourth splitter plates 26 away from the second flow channel opening 241 and the end of the second cooling member 2 away from the second flow channel opening 241 is shortened as they approach the second splitter plate 24. According to the positions of the water inlet 121 and the water outlet 221, and the connection positions of the first notch 111 and the second notch 212 with the second flow channel, by designing the positional relationship between the two ends of the plurality of first splitter plates 15, the second splitter plates 16, the third splitter plates 25 and the fourth splitter plates 26 and the first cooling member 1 or the second cooling member 2, the flow rates of the first splitter channel 3, the second splitter channel 4, the third splitter channel 5 and the fourth splitter channel 6 are ensured to be as equal as possible, so that the coolant fills the first flow channel and the second flow channel, thereby improving the heat exchange efficiency.

[0052] Reference Figure 2 , the first end of the first cooling member 1 and the second end of the first cooling member 1 are each provided with a first opening, and the first end of the second cooling member 2 and the second end of the second cooling member 2 are each provided with a second opening. Two blocking members 7 are provided and are respectively located at both ends of the cooling device, that is, one blocking member 7 is used to simultaneously block a first opening of the first cooling member 1 and a second opening of the second cooling member 2, and the other blocking member 7 is used to simultaneously block another first opening of the first cooling member 1 and another second opening of the second cooling member 2, thereby achieving sealing of the first flow channel and the second flow channel.

[0053] The blocking member 7 includes a main body and a blocking portion connected to one side of the main body. The main body is arranged in the first cooling member 1 and the second cooling member 2. The blocking portion is used to block the first opening and the second opening.

[0054] Reference Figure 1 A cooling device further includes two fixed cross beams 8 and two hoisting longitudinal beams 9. The two fixed cross beams 8 are respectively located at the two ends of the cooling device, and the two hoisting longitudinal beams 9 are respectively located at the two sides of the cooling device. The two fixed cross beams 8 are respectively fixed to the first ends of the first cooling member 1 and the second cooling member 2 and the second ends of the first cooling member 1 and the second cooling member 2. The two hoisting longitudinal beams 9 are respectively fixed to the second side of the first cooling member 1 and the first side of the second cooling member 2. The hoisting longitudinal beams 9 are provided with hoisting holes to facilitate the installation of the cooling device.

[0055] Two fixed cross beams 8, two hoisting longitudinal beams 9, a first cooling member 1 and a second cooling member 2 form a receiving groove 10 for accommodating a battery module. An insulating layer is provided on the bottom of the receiving groove 10, i.e., the upper surface of the first cooling member 1 and the second cooling member 2. The insulating layer can be made of materials such as insulating paint or insulating blue film, which plays the role of insulation between the cooling device and the battery module.

[0056] The embodiment of the present application also provides a manufacturing method of a cooling device, specifically: firstly, the first cooling member 1 and the second cooling member 2 are formed by aluminum extrusion, and then the second side of the first cooling member 1 and the first side of the second cooling member 2 are fixed together by stir friction welding, and then the first flow channel and the second flow channel are processed by a CNC machine tool to form a first flow partition 14, a second flow partition 24, a first flow divider 15, a second flow divider 16, a third flow divider 25 and a fourth flow divider 26. Then, two blocking members 7, two fixed cross beams 8 and two hoisting longitudinal beams 9 are welded to the corresponding positions on the first cooling member 1 and the second cooling member 2 by argon arc welding. Compared with the processing method in the related art, it can save the processing flow and improve the processing efficiency.

[0057] The embodiment of the present application also provides a battery module, comprising the above cooling device and a battery pack, wherein the cooling device is used to cool the battery pack. The battery pack may be a cylindrical battery or a square battery.

[0058] Example 3

[0059] The difference from Example 2 is that the cooling device further includes a third cooling member located between the first cooling member 1 and the second cooling member 2, and the third cooling member is provided with a third flow channel. The third cooling member includes a first side and a second side opposite to each other, and the first side and the second side are both provided with a third notch connected to the third flow channel, and the two third notches are respectively connected to the first notch 111 and the second notch 212, and the third cooling member is assembled with the first cooling member 1 and the second cooling member 2 by stir friction welding, and the structure of the third flow channel of the third cooling member is the same as the structure of the first flow channel of the first cooling member 1, so that the difference between the first cooling member 1, the second cooling member 2 and the third cooling member is only the number of notches, which is convenient for mass production and rapid processing, and has a simpler process than the related art.

[0060] Example 4

[0061] The difference from Example 3 is that the cooling device further includes a plurality of third cooling members, which are arranged side by side in the direction from the first cooling member 1 to the second cooling member 2, and the two third notches of the third cooling member closest to the first cooling member 1 are respectively connected to a third notch and the first notch 111 of the adjacent third cooling member, and the two third notches of the third cooling member closest to the second cooling member 2 are respectively connected to a third notch and the second notch 212 of the adjacent third cooling member. By arranging a plurality of third cooling members, the cooling and heat dissipation of a larger battery module can be adapted. At the same time,

[0062] Example 5

[0063] The difference between this embodiment and embodiment 2 is that:

[0064] Reference Figure 6 The blocking member 7 facing the first flow channel opening 141 and the second flow channel opening 241 includes a first blocking member 71 and a second blocking member 72. The first blocking member 71 is disposed at the first end of the first cooling member 1 and the first end of the second cooling member 2, and the second blocking member 72 is disposed at the second end of the first cooling member 1 and the second end of the second cooling member 2.

[0065] Reference Figure 7 The first blocking member 71 includes a first main body 711, a first blocking portion 712 disposed on one side of the first main body 711, and a third flow partition 713. The third flow partition 713 and the first main body 711 are located inside the first cooling member 1 and the second cooling member 2, and together with the first cooling member 1 and the second cooling member 2, form a fifth main flow channel 101. Both ends of the third flow partition 713 are provided with a connecting port 714. Part of the first branch flow channel 3 and part of the fourth branch flow channel 6 are connected to the fifth main flow channel 101 through the two connecting ports 714. The first blocking portion 712 is used to simultaneously block a first opening and a second opening.

[0066] Reference Figure 8 The second blocking member 72 includes a second main body 721 and a second blocking portion 722 disposed on one side of the second main body 721. The second main body 721 is located inside the first cooling member 1 and the second cooling member 2, and the second blocking portion 722 is used to block the other first opening and the other second opening at the same time. The structure of the two blocking members 7 in Example 2 is the same as the structure of the second blocking member 72 in this embodiment.

[0067] Reference Fig. 9, the distance between the end of the plurality of first flow dividers 15 away from the first opening and the end of the first cooling member 1 away from the first opening is shortened as it approaches the first flow divider 14. The distance between the end of the plurality of third flow dividers 25 away from the second opening and the end of the second cooling member 2 away from the second opening is shortened as it moves away from the second notch 212. This allows the flow rates of the first flow channel 3, the second flow channel 4, the third flow channel 5 and the fourth flow channel 6 to be as equal as possible, so that the coolant fills the first flow channel and the second flow channel, thereby improving the heat exchange efficiency. The vertical distance between one end of the fourth flow divider 26 facing the connecting port 714 and the third flow divider 713 is smaller than the vertical distance between the other fourth flow dividers 26 and the third flow divider 713. This reduces the cross-flow between the fifth main flow channel 101 and the fourth main flow channel 28, thereby avoiding affecting the flow rate of the coolant in the cooling device.

[0068] Due to the arrangement of the fifth main flow channel 101, the distances between the ends of the first diverter plate 15, the second diverter plate 16, the third diverter plate 25 and the fourth diverter plate 26 close to the fifth main flow channel 101 are all the same. The distance between the ends of the plurality of first diverter plates 15 away from the first flow channel opening 141 and the end of the first cooling member 1 away from the first flow channel opening 141 shortens as they approach the first flow divider 14. The distance between the ends of the plurality of third diverter plates 25 away from the second flow channel opening 241 and the end of the second cooling member 2 away from the second flow channel opening 241 shortens as they approach the second flow divider 24, thereby achieving a uniform flow rate at various locations of the cooling device.

[0069] Based on the coolant flow direction of the cooling device of Example 2, a branch flow from the first main channel 17 to the fifth main channel 101 is additionally added, and the coolant in the fifth main channel 101 flows out from part of the fourth main channel 28. The fifth main channel 101 improves the heat exchange efficiency of the cooling device.

[0070] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A cooling device, characterized in that: include: The first cooling member (1) and the second cooling member (2) each comprise a first side and a second side opposite to each other, the first cooling member (1) being provided with a first flow channel, and the second cooling member (2) being provided with a second flow channel; The first side of the first cooling member (1) is fixedly connected to the second side of the second cooling member (2); the first side of the first cooling member (1) is provided with a first notch (111); the second side of the second cooling member (2) is provided with a second notch (212); the first flow channel is connected to the second flow channel via the first notch (111) and the second notch (212).

2. The cooling device according to claim 1, characterized in that: The first cooling member (1) comprises a first connecting plate (11) and a first plate (12) and a second plate (13) opposite thereto, wherein the first connecting plate (11) is connected between the first plate (12) and the second plate (13) to enclose at least a portion of the first flow channel; the second cooling member (2) comprises a second connecting plate (21) and a third plate (22) and a fourth plate (23) opposite thereto, wherein the second connecting plate (21) is connected between the third plate (22) and the fourth plate (23) to enclose at least a portion of the second flow channel; wherein the first notch (111) is provided on the first connecting plate (11), the second notch (212) is provided on the second connecting plate (21), and the first connecting plate (11) is fixedly connected to the second connecting plate (21).

3. The cooling device according to claim 2, characterized in that: The first cooling element (1) further comprises a first flow partition (14), the first flow partition (14) being connected between the first plate (12) and the second plate (13) to divide the first flow channel into a first main flow channel (17) and a second main flow channel (18), one end of the first flow partition (14) being provided with a first flow channel opening (141), the first main flow channel (17) being connected to the second main flow channel (18) through the first flow channel opening (141); the second cooling element (2) further comprises a second flow partition (24), the second flow partition (24) being located at the The second flow partition plate (24) is disposed between the third plate (22) and the fourth plate (23) and is connected to the third plate (22) and the fourth plate (23) so as to divide the second flow channel into a third main flow channel (27) and a fourth main flow channel (28); a second flow channel opening (241) is provided at one end of the second flow partition plate (24); the third main flow channel (27) is connected to the fourth main flow channel (28) through the second flow channel opening (241); and the first main flow channel (17) and the fourth main flow channel (28) are located on both sides of the second main flow channel (18) and the third main flow channel (27).

4. The cooling device according to claim 3, characterized in that: The first cooling member (1) further comprises a plurality of first flow divider plates (15) and a plurality of second flow divider plates (16), wherein the first flow divider plates (15) are connected between the first plate (12) and the second plate (13) to divide the first main channel (17) into a plurality of first flow divider channels (3), and the second flow divider plates (16) are connected between the first plate (12) and the second plate (13) to divide the second main channel (18) into a plurality of second flow divider channels (4); the second cooling member (2) further comprises a plurality of third flow divider plates (25) and a plurality of fourth flow divider plates (26), wherein the third flow divider plates (25) are connected between the third plate (22) and the fourth plate (23) to divide the third main channel (27) into a plurality of third flow divider channels (5), and the fourth flow divider plates (26) are connected between the third plate (22) and the fourth plate (23) to divide the fourth main channel (28) into a plurality of fourth flow divider channels (6).

5. The cooling device according to claim 4, characterized in that: It also includes two sealing members (7), the first cooling member (1) and the second cooling member (2) each include a first end and a second end opposite to each other, the first end of the first cooling member (1) and the second end of the first cooling member (1) are each provided with a first opening connected to the first flow channel, the first end of the second cooling member (2) and the second end of the second cooling member (2) are each provided with a second opening connected to the second flow channel, and each of the sealing members (7) seals one of the first openings and one of the second openings.

6. The cooling device according to claim 5, characterized in that: The blocking member (7) comprises a first blocking member (71), the first blocking member (71) is arranged close to the first end, the first blocking member (71) comprises a first main body (711), a first blocking portion (712) arranged on one side of the first main body (711), and a third flow partition (713) arranged on the other side of the first main body (711); the third flow partition (713) and the first main body (711) are located in the first cooling member (1) and the second cooling member (2) and form a fifth main flow channel (101) with the first cooling member (1) and the second cooling member (2); both ends of the third flow partition (713) are provided with a connecting port (714), and part of the first branch flow channel (3) and part of the fourth branch flow channel (6) are connected to the fifth main flow channel (101) through the two connecting ports (714); And / or, the blocking member (7) includes a second blocking member (72), and the second blocking member (72) is arranged close to the second end; the second blocking member (72) includes a second main body (721) and a second blocking portion (722) arranged on one side of the second main body (721), the second main body (721) is located in the first cooling member (1) and the second cooling member (2), and the second blocking portion (722) blocks a first opening and a second opening located at the second end.

7. The cooling device according to claim 6, characterized in that: The vertical distance between one end of the fourth splitter plate (26) directly facing the communication port (714) and the third splitter plate (713) is smaller than the vertical distance between the other fourth splitter plates (26) and the third splitter plate (713).

8. The cooling device according to claim 6, characterized in that: The distance between one end of the plurality of first flow dividers (15) away from the first opening and one end of the first cooling member (1) away from the first opening shortens as they approach the first flow partition (14).

9. The cooling device according to claim 6, characterized in that: The distance between one end of the plurality of third flow dividers (25) away from the second opening and one end of the second cooling member (2) away from the second opening shortens as they move away from the second notch (212).

10. The cooling device according to any one of claims 1 to 9, characterized in that: It also includes a third cooling member arranged between the first cooling member (1) and the second cooling member (2), the third cooling member is provided with a third flow channel, the third cooling member includes a first side and a second side opposite to each other, the first side of the third cooling member and the second side of the third cooling member are both provided with a third notch connected to the third flow channel, wherein one of the third notches is connected to the first notch (111), and the other of the third notches is connected to the second notch (212).

11. The cooling device according to claim 10, characterized in that: A plurality of third cooling members are connected side by side in a direction from the first cooling member (1) to the second cooling member (2), and adjacent third cooling members are connected via the third notches. Two third notches of a third cooling member close to the first cooling member (1) are respectively connected to one third notch of an adjacent third cooling member and the first notch (111), and two third notches of a third cooling member close to the second cooling member (2) are respectively connected to one third notch of an adjacent third cooling member and the second notch (212).

12. The cooling device according to any one of claims 1 to 9 and 11, characterized in that: It also includes an insulating layer provided on the first cooling member (1) and the second cooling member (2) for insulation from the battery module.

13. A battery module, characterized in that: The cooling device comprises a cooling device as described in any one of claims 1 to 12, and also comprises a battery pack, wherein the cooling device is used to cool the battery pack.

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