Cooling device and manufacturing method therefor, battery module and battery pack

Abstract

The present application provides a cooling device, comprising: a first cooling member and a second cooling member each comprising 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, wherein the first side of the first cooling member is fixedly connected to the second side of the second cooling member, a first notch is formed in the first side of the first cooling member, a second notch is formed in the second side of the second cooling member, and the first flow channel is communicated with the second flow channel through the first notch and the second notch.

Description

A cooling device and manufacturing method thereof, a battery module, and a battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 29, 2023, with application number 202323664832.7. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a cooling device and a manufacturing method thereof, a battery module, and a battery pack. Background Art

[0003] The cooling plate is a crucial component of the active cooling system for energy storage batteries. Good temperature control is crucial to the lifespan of the battery. The production of the cooling plate begins with stamping aluminum sheets using stamping equipment and dies to form the flow channel plate. This is then completed through a series of processes, including graphite screen printing, gas injection, cutting, and punching. SUMMARY OF THE INVENTION

[0004] In the related art, the processing technology of the cooling plate is complicated, which makes it inconvenient to produce cooling plates of corresponding sizes for partially integrated large battery modules to achieve cooling and heat dissipation.

[0005] In a first aspect, an embodiment of the present application provides a cooling device, comprising:

[0006] 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;

[0007] 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.

[0008] In a second aspect, an embodiment of the present application provides a manufacturing method for manufacturing the above-mentioned cooling device, the manufacturing method comprising:

[0009] A first cooling member is formed by an aluminum extrusion molding process;

[0010] The second cooling member is formed by an aluminum extrusion molding process;

[0011] connecting the first side of the first cooling member and the second side of the second cooling member;

[0012] machining a first flow channel on the first cooling member;

[0013] A second flow channel is machined on the second cooling member.

[0014] In a third aspect, an embodiment of the present application provides a battery module, comprising a cooling device as described above, and a battery pack, wherein the cooling device is configured to cool the battery pack.

[0015] In a fourth aspect, an embodiment of the present application provides a battery pack, comprising a box body and a plurality of battery modules arranged inside the box body, wherein the battery modules include the battery modules as described above. Beneficial effects

[0016] The cooling device provided in the present application splits the cooling device into a first cooling part and a second cooling part that can be produced independently, and connects the first cooling part and the second cooling part 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.

[0017] The manufacturing method of the cooling device provided in the present application manufactures the first cooling member and the second cooling member independently, and then connects the first cooling member and the second cooling member, which can improve the technical problem of the difficulty in producing the cooling device.

[0018] The battery module provided in the present application is designed based on the above-mentioned cooling device. Its beneficial effects can be found in the beneficial effects of the above-mentioned cooling device, which will not be described in detail here.

[0019] The battery pack provided in this application is designed based on the above-mentioned battery module. Its beneficial effects can be found in the beneficial effects of the above-mentioned battery module, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a perspective schematic diagram of a cooling device provided in Example 2 of the present application;

[0021] FIG2 is an exploded view of a cooling device provided in Example 2 of the present application;

[0022] FIG3 is a schematic structural diagram of a first cooling element provided in Example 2 of the present application;

[0023] FIG4 is a schematic structural diagram of a second cooling element provided in Example 2 of the present application;

[0024] FIG5 is a cross-sectional view of a cooling device provided in Example 2 of the present application;

[0025] FIG6 is a schematic structural diagram of a cooling device provided in Example 5 of the present application;

[0026] FIG7 is a cross-sectional view of a first blocking member provided in Example 5 of the present application;

[0027] FIG8 is a cross-sectional view of a second blocking member provided in Example 5 of the present application;

[0028] FIG9 is a cross-sectional view of a cooling device provided in Example 5 of the present application;

[0029] FIG10 is a schematic structural diagram of a third cooling element provided in Example 4 of the present application;

[0030] FIG11 is a schematic structural diagram of an insulating layer provided on a cooling member according to Example 2 of the present application;

[0031] Description of the drawings:

[0032] 100. Cooling device; 1. First cooling element; 110. First side of first cooling element; 120. Second side of first cooling element; 130. First end of first cooling element; 140. Second end of first cooling element; 11. First connecting plate; 111. First notch; 12. First plate; 121. Water inlet; 13. Second plate; 14. First flow divider; 150. First flow channel; 141. First flow channel opening; 15. First diverter plate; 16. Second diverter plate; 17. First main flow channel; 18. Second main flow channel; 19. First opening; 2. Second cooling element; 210. First side of second cooling element; 220. Second side of second cooling element; 230. First end of second cooling element; 240. Second end of second cooling element; 21. Second connecting plate; 212. Second notch; 22. Third plate; 221. Water outlet; 23. Fourth plate; 24. Second flow separator; 250. Second flow channel; 241. Second flow channel opening; 25. Third diverter; 26. Fourth diverter; 27. Third main flow channel; 28. Fourth main flow channel; 171. First diverter; 181. Second diverter; 271. Third diverter; 281. Fourth diverter; 29. ​​Second opening; 3. Third cooling element; 31. Third flow channel; 310. First side of third cooling element; 320. Second side of third cooling element; 32. Third notch; 6. Insulating layer; 7. Sealing element; 71. First sealing element; 711. First main body; 712. First sealing portion; 713. Third flow separator; 714. Connecting opening; 72. Second sealing element; 721. Second main body; 722. Second sealing portion; 8. Fixed crossbeam; 9. Lifting longitudinal beam; 10. Receiving groove; 101. Fifth main flow channel. Modes for Carrying Out the Invention

[0033] In this application, unless otherwise specified, directional words such as "upper" and "lower" generally refer to the upper and lower parts of the device in actual use or working state, specifically the direction of the drawings in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0034] Example 1

[0035] 1 and 2 , an embodiment of the present application provides a cooling device 100, comprising:

[0036] A first cooling element 1 and a second cooling element 2, wherein the first cooling element 1 includes an opposing first cooling element side 110 and a first cooling element second side 120, and the second cooling element 2 includes an opposing second cooling element first side 210 and a second cooling element second side 220, the first cooling element 1 is provided with a first flow channel 150, and the second cooling element 2 is provided with a second flow channel 250;

[0037] In which, the first side 110 of the first cooling part is fixedly connected to the second side 220 of the second cooling part, the first side 110 of the first cooling part is provided with a first notch 111, and the second side 220 of the second cooling part is provided with a second notch 212, and the first flow channel 150 is connected to the second flow channel 250 through the first notch 111 and the second notch 212.

[0038] Compared to producing a single, larger cooling element, splitting the cooling device 100 into separate, independently produced first and second cooling elements 1 and 2 can reduce production complexity and improve product yield. Furthermore, the first and second cooling elements 1 and 2 are connected via the first notch 111 and the second notch 212, making it easier to securely install the first and second cooling elements 1 and 2. Furthermore, the connection is simple and easy to operate.

[0039] Example 2

[0040] 1 and 2 , an embodiment of the present application provides a cooling device 100 , including a first cooling member 1 , a second cooling member 2 , and a blocking member 7 .

[0041] 3 , 4 and 5 , a first cooling member 1 and a second cooling member 2 are shown. The first cooling member 1 includes a first side 110 of the first cooling member and a second side 120 of the first cooling member relative to each other. The second cooling member 2 includes a first side 210 of the second cooling member and a second side 220 of the second cooling member relative to each other. The first cooling member 1 is provided with a first flow channel 150 and the second cooling member 2 is provided with a second flow channel 250.

[0042] The first cooling element 1 includes a first connecting plate 11, a first plate 12, a second plate 13, a first flow divider 14, a plurality of first flow diverter plates 15, and a plurality of second flow diverter plates 16. 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. A first notch 111 is defined on a first side of the first cooling element 1. Specifically, the first connecting plate 11 is provided with the 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 150 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] Multiple first diverter plates 15 are arranged side by side and connected between the first plate 12 and the second plate 13 to divide the first main channel 17 into multiple first diverter channels 171. The multiple first diverter channels 171 are interconnected at both ends. Multiple second diverter plates 16 are arranged side by side and connected between the first plate 12 and the second plate 13 to divide the second main channel 18 into multiple second diverter channels 181. The multiple second diverter channels 181 are interconnected at both ends. A first flow channel opening 141 is defined at the end of the first flow divider 14 away from the first notch 111. The first main channel 17 and the second main channel 18 are interconnected at the first flow channel opening 141.

[0045] The second cooling element 2 includes a second connecting plate 21, a third plate 22, a fourth plate 23, a second flow divider 24, a plurality of third flow diverter plates 25, and a plurality of fourth flow diverter plates 26. 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 250. A second notch 212 is defined on the second side of the second cooling element 2, specifically, the second connecting plate 21. The first flow channel 150 communicates with the second flow channel 250 through the first notch 111 and the second notch 212.

[0046] The second flow divider 24 is connected between the third plate 22 and the fourth plate 23 to separate the second flow channel 250 into a third main flow channel 27 and a fourth main flow channel 28 . The second flow divider 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] Multiple third manifolds 25 are arranged side by side and connected between the third plate 22 and the fourth plate 23 to divide the third main channel 27 into multiple third manifolds 271. The multiple third manifolds 271 are interconnected at both ends. Multiple fourth manifolds 26 are arranged side by side and connected between the third plate 22 and the fourth plate 23 to divide the fourth main channel 28 into multiple fourth manifolds 281. The multiple fourth manifolds 281 are interconnected at both ends. A second flow channel opening 241 is defined at the end of the second flow divider 24 away from the second notch 212. The third main channel 27 and the fourth main channel 28 are interconnected at the second flow channel opening 241.

[0048] The first flow partition 14, the second flow partition 24, the first diverter plate 15, the second diverter plate 16, the third diverter plate 25 and the fourth diverter plate 26 separate the coolant in the cooling device 100 into different areas, thereby increasing the heat exchange rate inside and outside the cooling device 100 and improving the heat exchange effect.

[0049] The first plate 12 is provided with a water inlet 121 that communicates with the 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 that communicates with the end of the fourth main channel 28 away from the second channel opening 241. The coolant in the first cooling element 1 and the second cooling element 2 flows through 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] 5 , the projection of an imaginary line between the ends of the plurality of first manifold plates 15 and the plurality of second manifold plates 16 near the first flow channel opening 141, in a direction perpendicular to the first plate 12, convexly extends away from the first flow channel opening 141. The projection of an imaginary line between the ends of the plurality of third manifold plates 25 and the plurality of fourth manifold plates 26 near the first flow channel opening 141, in a direction perpendicular to the third plate 22, convexly extends away from the second flow channel opening 241.

[0051] The distance between the ends of the plurality of first manifold plates 15 and the plurality of second manifold plates 16 away from the first flow opening 141 and the end of the first cooling element 1 away from the first flow opening 141 decreases as they approach the first flow partition 14. The distance between the ends of the plurality of third manifold plates 25 and the plurality of fourth manifold plates 26 away from the second flow opening 241 and the end of the second cooling element 2 away from the second flow opening 241 decreases as they approach the second flow partition 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 250, by designing the positional relationship between the two ends of multiple first diverter plates 15, the second diverter plates 16, the third diverter plates 25 and the fourth diverter plates 26 and the first cooling member 1 or the second cooling member 2, the flow rates of the first diverter channel 171, the second diverter channel 181, the third diverter channel 271 and the fourth diverter channel 281 are ensured to be as similar as possible, so that the coolant fills the first flow channel 150 and the second flow channel 250, thereby improving the heat exchange efficiency.

[0052] 2 , first end 130 of the first cooling member and second end 140 of the first cooling member are each provided with a first opening 19, and first end 230 of the second cooling member and second end 240 of the second cooling member are each provided with a second opening 29. Two blocking members 7 are provided, one at each end of cooling device 100, namely: one blocking member 7 is used to simultaneously block a first opening 19 of first cooling member 1 and a second opening 29 of second cooling member 2, and the other blocking member 7 is used to simultaneously block the other first opening 19 of first cooling member 1 and the other second opening 29 of second cooling member 2, thereby achieving sealing of first flow channel 150 and second flow channel 250.

[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 disposed in the first cooling member 1 and the second cooling member 2 . The blocking portion is used to block the first opening 19 and the second opening 29 .

[0054] Referring to Figure 1, a cooling device 100 also includes two fixed crossbeams 8 and two hoisting longitudinal beams 9. The two fixed crossbeams 8 are respectively located at both ends of the cooling device 100, and the two hoisting longitudinal beams 9 are respectively located on both sides of the cooling device 100. The two fixed crossbeams 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 120 of the first cooling member 1 and the first side 210 of the second cooling member 2. Hoisting holes are provided on the hoisting longitudinal beams 9 to facilitate the installation of the cooling device 100.

[0055] 1 and 11 , 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 6 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 6 can be made of materials such as insulating paint or insulating blue film, which serves to insulate the cooling device 100 from the battery module.

[0056] The present application also provides a method for manufacturing a cooling device 100, specifically: first, a first cooling member 1 and a second cooling member 2 are formed by aluminum extrusion. The second side of the first cooling member 1 and the first side of the second cooling member 2 are then fixed together by friction stir welding. Subsequently, a first flow channel 150 and a second flow channel 250 are machined using a CNC machine tool to form a first flow divider 14, a second flow divider 24, a first diverter plate 15, a second diverter plate 16, a third diverter plate 25, and a fourth diverter plate 26. Two sealing members 7, two fixed crossbeams 8, and two lifting longitudinal beams 9 are then welded to corresponding positions on the first cooling member 1 and the second cooling member 2 by argon arc welding. Compared to the processing methods used in related arts, this method can save processing steps and improve processing efficiency.

[0057] The present invention also provides a battery module, comprising the cooling device 100 and a battery pack, wherein the cooling device 100 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, as shown in FIG10 , the cooling device 100 further includes a third cooling member 3 located between the first cooling member 1 and the second cooling member 2, and the third cooling member 3 is provided with a third flow channel 31. The third cooling member 3 includes a first side 310 of the third cooling member and a second side 320 of the third cooling member relative to each other, and the first side 310 of the third cooling member and the second side 320 of the third cooling member are both provided with a third notch 32 connected to the third flow channel 31, and the two third notches 32 are respectively connected to the first notch 111 and the second notch 212. The third cooling member 3 is assembled with the first cooling member 1 and the second cooling member 2 by friction stir welding. The structure of the third flow channel 31 of the third cooling member 3 is the same as the structure of the first flow channel 150 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 3 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 100 further includes a plurality of third cooling members 3, which are arranged side by side along the direction from the first cooling member 1 to the second cooling member 2. The two third notches 32 of the third cooling member 3 closest to the first cooling member 1 are respectively connected to a third notch 32 and the first notch 111 of the adjacent third cooling member 3, and the two third notches 32 of the third cooling member 3 closest to the second cooling member 2 are respectively connected to a third notch 32 and the second notch 212 of the adjacent third cooling member 3. By providing a plurality of third cooling members 3, 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] 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 provided 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 provided at the second end of the first cooling member 1 and the second end of the second cooling member 2.

[0065] Referring to Figure 7 , the first blocking member 71 includes a first body 711, a first blocking portion 712 disposed on one side of the first body 711, and a third flow divider 713. The third flow divider 713 and the first body 711 are located within the first cooling element 1 and the second cooling element 2, and together with the first cooling element 1 and the second cooling element 2, form the fifth main flow channel 101. A communication port 714 is provided at each end of the third flow divider 713. Portions of the first branch flow channel 171 and portions of the fourth branch flow channel 281 communicate with the fifth main flow channel 101 through the two communication ports 714. The first blocking portion 712 is used to simultaneously block a first opening 19 and a second opening 29.

[0066] 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 positioned within the first cooling member 1 and the second cooling member 2, and the second blocking portion 722 is configured to simultaneously block the other first opening 19 and the other second opening 29. The structure of the two blocking members 7 in Example 2 is identical to that of the second blocking member 72 in this embodiment.

[0067] Referring to Figure 9 , the distance between the ends of the multiple first diverter plates 15 distal to the first opening 19 and the end of the first cooling element 1 distal to the first opening 19 decreases as they approach the first flow divider 14. The distance between the ends of the multiple third diverter plates 25 distal to the second opening 29 and the end of the second cooling element 2 distal to the second opening 29 decreases as they move away from the second notch 212. This ensures that the flow rates of the first, second, third, and fourth diverter channels 171, 181, 271, and 281 are as uniform as possible, ensuring that the coolant fills the first and second flow channels 150, 250, and improving heat exchange efficiency. The vertical distance between the end of the fourth diverter plate 26 facing the connecting opening 714 and the third flow divider 713 is smaller than the vertical distance between the other fourth diverter plates 26 and the third flow divider 713. This reduces crossflow between the fifth main channel 101 and the fourth main channel 28, preventing it from affecting the flow rate of the coolant within the cooling device 100.

[0068] Due to the provision of the fifth main flow channel 101, the distances between the ends of the first diverter plates 15, the second diverter plates 16, the third diverter plates 25, and the fourth diverter plates 26 closest to the fifth main flow channel 101 are all the same. The distances between the ends of the multiple first diverter plates 15 distal to the first flow channel opening 141 and the ends of the first cooling element 1 distal to the first flow channel opening 141 decrease as they approach the first flow divider 14. The distances between the ends of the multiple third diverter plates 25 distal to the second flow channel opening 241 and the ends of the second cooling element 2 distal to the second flow channel opening 241 decrease as they approach the second flow divider 24, thereby ensuring uniform flow across the cooling device 100.

[0069] Based on the coolant flow direction of the cooling device 100 of Example 2, a branch flow is additionally introduced from the first main channel 17 into the fifth main channel 101. The coolant in the fifth main channel 101 flows out from a portion of the fourth main channel 28. The fifth main channel 101 improves the heat exchange efficiency of the cooling device 100.

[0070] Example 6

[0071] The present invention provides a battery pack comprising a housing and a plurality of battery modules disposed within the housing. Each battery module comprises the cooling device 100 and a battery pack, and the cooling device 100 is used to cool the battery pack. The battery pack may be cylindrical or prismatic.

Claims

1. A cooling device, comprising: A first cooling member (1) and a second cooling member (2), the first cooling member (1) includes opposite first side (110) and second side (120), the second cooling member (2) includes opposite first side (210) and second side (220), the first cooling member (1) is provided with a first flow channel (150), and the second cooling member (2) is provided with a second flow channel (240); Wherein, the first side (110) of the first cooling member (1) is fixedly connected to the second side (220) of the second cooling member (2), the first side (110) of the first cooling member (1) is provided with a first notch (111), the second side (220) of the second cooling member (2) is provided with a second notch (212), and the first flow channel (150) communicates with the second flow channel (250) through the first notch (111) and the second notch (212).

2. The cooling device according to claim 1, wherein The first cooling member (1) includes a first connecting plate (11) and opposite first plate (12) and second plate (13), 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 (150); the second cooling member (2) includes a second connecting plate (21) and opposite third plate (22) and fourth plate (23), 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 (250); 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, wherein The first cooling member (1) further includes a first flow dividing plate (14), the first flow dividing plate (14) is connected between the first plate (12) and the second plate (13) to divide the first flow channel (150) into a first main flow channel (17) and a second main flow channel (18), one end of the first flow dividing plate (14) is provided with a first flow port (141), and the first main flow channel (17) communicates with the second main flow channel (18) through the first flow port (141); the second cooling member (2) further includes a second flow dividing plate (24), the second flow dividing plate (24) is located between the third plate (22) and the fourth plate (23), and the second flow dividing plate (24) is connected to the third plate (22) and the fourth plate (23) to divide the second flow channel (250) into a third main flow channel (27) and a fourth main flow channel (28), one end of the second flow dividing plate (24) is provided with a second flow port (241), and the third main flow channel (27) communicates with the fourth main flow channel (28) through the second flow port (241); 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, wherein, The first cooling member (1) further includes a plurality of first flow dividing plates (15) and a plurality of second flow dividing plates (16). The first flow dividing plates (15) are connected between the first plate (12) and the second plate (13) to divide the first main flow channel (17) into a plurality of first sub-flow channels (171), and the second flow dividing plates (16) are connected between the first plate (12) and the second plate (13) to divide the second main flow channel (18) into a plurality of second sub-flow channels (181). The second cooling member (2) further includes a plurality of third flow dividing plates (25) and a plurality of fourth flow dividing plates (26). The third flow dividing plates (25) are connected between the third plate (22) and the fourth plate (23) to divide the third main flow channel (27) into a plurality of third sub-flow channels (271), and the fourth flow dividing plates (26) are connected between the third plate (22) and the fourth plate (23) to divide the fourth main flow channel (28) into a plurality of fourth sub-flow channels (281).

5. The cooling device according to claim 4, wherein It further includes two blocking members (7). The first cooling member (1) includes an opposite first end (130) and second end (140), and the second cooling member (2) includes an opposite first end (230) and second end (240). A first opening (19) communicating with the first flow channel (150) is provided at both the first end (130) and the second end (140) of the first cooling member (1), and a second opening (29) communicating with the second flow channel (250) is provided at both the first end (230) and the second end (240) of the second cooling member (2). Each blocking member (7) blocks one of the first openings (19) and one of the second openings (29).

6. The cooling device according to claim 5, wherein, The blocking member (7) includes a first blocking member (71). The first blocking member (71) is disposed near the first end (130) of the first cooling member and the first end (230) of the second cooling member. The first blocking member (71) includes a first main body (711), a first blocking portion (712) provided on one side of the first main body (711), and a third flow dividing plate (713) provided on the other side of the first main body (711). The third flow dividing plate (713) and the first main body (711) are located inside the first cooling member (1) and the second cooling member (2) and enclose a fifth main flow channel (101) with the first cooling member (1) and the second cooling member (2). A communication port (714) is provided at both ends of the third flow dividing plate (713). Part of the first sub-flow channels (171) and part of the fourth sub-flow channels (281) communicate with the fifth main flow channel (101) through the two communication ports (714). And / or, the plugging member (7) includes a second plugging member (72) disposed near the second end; the second plugging member (72) includes a second main body (721) and a second plugging portion (722) disposed on one side of the second main body (721), the second main body (721) is located within the first cooling member (1) and the second cooling member (2), and the second plugging portion (722) plugs one first opening (19) at the second end (140) of the first cooling member and one second opening (29) at the second end (240) of the second cooling member.

7. The cooling device according to claim 6, wherein, The vertical distance between one end of the fourth flow dividing plate (26) facing the communication port (714) and the third flow isolating plate (713) is less than the vertical distances between the other fourth flow dividing plates (26) and the third flow isolating plate (713).

8. The cooling device according to claim 6 or 7, wherein The distance between the ends of the plurality of first flow dividing plates (15) away from the first opening (19) and the end of the first cooling member (1) away from the first opening (19) shortens as it approaches the first flow isolating plate (14).

9. The cooling device according to claim 6 or 7 or 8, wherein, The distance between the ends of the plurality of third flow dividing plates (25) away from the second opening (29) and the end of the second cooling member (2) away from the second opening (29) shortens as it moves away from the second notch (212).

10. The cooling device according to any one of claims 1-9, wherein, It further includes a third cooling member (3) disposed between the first cooling member (1) and the second cooling member (2), the third cooling member (3) is provided with a third flow channel (31), the third cooling member (3) includes an opposite first side (310) of the third cooling member and a second side (320) of the third cooling member, and both the first side (310) and the second side (320) of the third cooling member are provided with a third notch (32) communicating with the third flow channel (31), one of the third notches (32) communicates with the first notch (111), and the other third notch (32) communicates with the second notch (212).

11. The cooling device according to claim 10, wherein, A plurality of the third cooling members (3) are connected in parallel along the direction from the first cooling member (1) to the second cooling member (2), and adjacent third cooling members (3) are communicated through the third notch (32). The two third notches (32) of one third cooling member (3) near the first cooling member (1) respectively communicate with one third notch (32) of an adjacent third cooling member and the first notch (111), and the two third notches (32) of one third cooling member (3) near the second cooling member (2) respectively communicate with one third notch (32) of an adjacent third cooling member (32) and the second notch (212).

12. The cooling device according to any one of claims 1-11, wherein, It further includes an insulating layer (6) disposed on the first cooling member (1) and the second cooling member (2) to be insulated from the battery module.

13. A manufacturing method for manufacturing the cooling device according to claim 1, the manufacturing method comprising: Preparing the first cooling member through an aluminum extrusion molding process; The second cooling member is formed by an aluminum extrusion process; Connect the first side of the first cooling member and the second side of the second cooling member; Machine a first flow channel on the first cooling member; Machine a second flow channel on the second cooling member.

14. A battery module, comprising the cooling device according to any one of claims 1-12, further comprising a battery pack, wherein the cooling device is configured to cool the battery pack.

15. A battery pack, comprising a box body and a plurality of battery modules disposed inside the box body, wherein the battery modules comprise the battery modules according to claim 14.

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