Cooling assembly of battery pack and battery pack

Abstract

The utility model relates to a cooling assembly of a battery pack and the battery pack, the cooling assembly comprises a box body and a cold plate, the cold plate is arranged in the box body, the cold plate is provided with an accommodating cavity and an air duct, a cooling medium is accommodated in the accommodating cavity, and the air duct penetrates through the cold plate; the box body is provided with an air inlet and an air outlet; the air duct is communicated with the air inlet and the air outlet; according to the battery pack, the cooling medium in the accommodating cavity can absorb heat generated by the battery cell, so that the temperature of the battery cell is reduced. External air flows into the air duct from the air inlet and flows out from the air outlet after flowing through the air duct. In the process, the temperature of the air flowing into the air duct from the air inlet is low, and the temperature of the air flowing out of the air outlet is high after the heat from the battery cell is absorbed in the air duct, so that the heat generated by the battery cell is taken away by the external continuously flowing air. By arranging two cooling modes of liquid cooling and air cooling, the temperature of the battery cell is not too high during working, the service life of the battery cell is not influenced, thermal runaway of the battery cell is avoided, and the safety of the battery pack is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a cooling component and a battery pack of a battery pack. Background Art

[0002] With the development of the new energy industry, batteries are increasingly used in fields such as vehicles and energy storage. During the operation of the battery, heat is generated. When the temperature of the battery is relatively high, it will affect the working efficiency and service life of the battery, and even cause thermal runaway.

[0003] Currently, the heat management of small power batteries generally only relies on natural cooling, and the cooling effect is relatively poor. Summary of the Utility Model

[0004] The present application provides a cooling component and a battery pack of a battery pack, which are used to solve the problems that the cooling effect of the battery is poor and it affects the working efficiency and service life of the battery.

[0005] A cooling component provided by an embodiment of the present application, the cooling component includes: a box body and a cold plate. The cold plate is arranged in the box body. The cold plate has a receiving cavity and an air duct. The receiving cavity contains a cooling medium, and the air duct penetrates through the cold plate. The box body has an air inlet and an air outlet, and the air duct is communicated with the air inlet and the air outlet.

[0006] In a possible design, the cold plate has a hollow structure, and the inside of the hollow structure forms the receiving cavity.

[0007] In a possible design, the cold plate includes an air inlet part, a transition part and a cooling part. The air inlet part is communicated with the air inlet, and the transition part connects the air inlet part and the cooling part, so that air flows from the air inlet part to the cooling part.

[0008] In a possible design, the air duct includes a first air duct, a second air duct and a third air duct that are sequentially communicated. The first air duct is arranged in the air inlet part, the second air duct is arranged in the transition part, and the third air duct is arranged in the cooling part.

[0009] In a possible design, the cooling part has a through channel, and the extending direction of the channel is the same as the extending direction of the third air duct. The transition part and the channel enclose the hollow structure

[0010] In a possible design, the first air duct includes a first sub-air duct and a second sub-air duct that are communicated. The extending directions of the first sub-air duct and the second sub-air duct are different, so as to guide air to flow from the air inlet part to the cooling part.

[0011] In a possible design, the cold plate has a heat dissipation part, and the heat dissipation part is located on one side of the accommodation cavity close to the third air duct.

[0012] In a possible design, the heat dissipation part includes a plurality of protrusions protruding into the accommodation cavity.

[0013] In a possible design, a liquid injection port is provided on the box body, and the liquid injection port is communicated with the accommodation cavity; the cooling assembly further includes a plugging member, and the plugging member can plug the liquid injection port.

[0014] A battery pack provided by an embodiment of the present application, the battery pack includes: a battery cell and a cooling assembly, and the cooling assembly is the above-mentioned cooling assembly.

[0015] In the present application, the coolant in the accommodation cavity can absorb the heat generated by the battery cell, thereby reducing the temperature of the battery cell. Further, when the temperature of the coolant is relatively high, it can undergo a phase change, changing from a liquid state to a gaseous state, thereby absorbing more heat, making the cooling effect of the cooling assembly better. The air duct is communicated with the air inlet and the air outlet. Therefore, the path of air flow is: the air from the outside flows into the air duct through the air inlet, and then flows out of the air outlet after flowing through the air duct. During the process of the air flowing through the cold plate, the air flowing into the air duct from the air inlet has a lower temperature, and after absorbing the heat from the battery cell in the air duct, the air flowing out of the air outlet has a higher temperature, so as to realize taking away the heat generated by the battery cell through the continuously flowing air from the outside. At the same time, the air flowing through the air duct from the outside reduces the temperature of the cold plate, and can also make the coolant that has changed into a gaseous state change back into a liquid state to repeatedly absorb the heat dissipated by the battery cell. That is, after the heat generated by the battery cell is absorbed by the cold plate, a part of it is directly taken away by the flowing air through air cooling, and another part is absorbed by the coolant through liquid cooling. After the coolant becomes gaseous, its heat can also be taken away by the flowing air, and then it becomes liquid again. By setting two cooling methods of liquid cooling and air cooling, the temperature of the battery cell during operation will not be too high, so as not to affect the life of the battery cell and prevent the battery cell from experiencing thermal runaway, thereby improving the safety of the battery pack. At the same time, because the cooling effect of the combined liquid cooling and air cooling method is better, when the battery pack is used in a vehicle, there is no need to externally connect a vehicle thermal management system, thereby reducing the design difficulty of the thermal management system and facilitating the assembly of the battery pack and the vehicle body. In other words, such a design of the cooling assembly is particularly suitable for the design of small power battery packs, such as battery packs for electric motorcycles, drones, etc.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the battery pack provided by the present application in a specific embodiment;

[0018] Figure 2 is Figure 1 a schematic structural view of the battery pack in another perspective;

[0019] Figure 3 is Figure 1 an explosion view of the battery pack in;

[0020] Figure 4 is Figure 3 a cross-sectional view of the cooling component in;

[0021] Figure 5 is Figure 3 a partial enlarged view of region I in;

[0022] Figure 6 is Figure 3 a schematic structural view of the cold plate in;

[0023] Figure 7 is Figure 6 an explosion view of the cold plate in;

[0024] Figure 8 is Figure 7 a partial enlarged view of region II in

[0025] Figure 9 is Figure 7 a cross-sectional view of the cold plate in.

[0026] Reference numerals:

[0027] 1 - box body;

[0028] 11 - liquid injection port;

[0029] 12 - air inlet;

[0030] 13 - air outlet;

[0031] 2 - cold plate;

[0032] 2a - accommodation cavity;

[0033] 2b - air duct;

[0034] 21 - air inlet part;

[0035] 211 - first air duct;

[0036] 211a - first sub-air duct;

[0037] 211b - second sub-air duct;

[0038] 212 - avoidance groove;

[0039] 22 - transition part;

[0040] 221 - second air duct;

[0041] 23 - Cooling section;

[0042] 231 - Third air duct;

[0043] 232 - Passage;

[0044] 233 - Heat dissipation section;

[0045] 3 - Sealing member;

[0046] 4 - Battery cell;

[0047] 5 - Electrical component;

[0048] 6 - Box cover.

[0049] The accompanying drawings here are incorporated into the description and form a part of this description, showing embodiments consistent with this application, and are used together with the description to explain the principles of this application. Detailed implementation manners

[0050] For a better understanding of the technical solutions of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0051] It should be clear that the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0052] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments, and are not intended to limit this application. The singular forms of "a", "the" and "said" used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0053] It should be understood that the term " / and" used herein is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0054] It should be noted that the orientation terms such as "upper", "lower", "left" and "right" described in the embodiments of this application are described from the angles shown in the accompanying drawings, and should not be construed as a limitation on the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0055] The present application provides a battery pack. As Figures 1 to 3 shown, the battery pack includes: a battery cell 4 and a cooling component. Among them, the cooling component includes: a box body 1 and a cold plate 2, and the battery cell 4 is installed in the cooling component. The cooling component can reduce the temperature of the battery cell 4, enable the battery cell 4 to work at a suitable temperature, so that the battery cell 4 has a higher working efficiency, a longer service life, and will not undergo thermal runaway.

[0056] As Figure 3 shown, the battery pack further includes an electrical component 5, and the electrical component 5 can collect the voltage and temperature information of the battery cell 4, so as to monitor the condition of the battery cell 4.

[0057] The present application provides a cooling component. As Figure 3 and Figure 4 shown, the cooling component includes: a box body 1 and a cold plate 2. The cold plate 2 is arranged in the box body 1. The cold plate 2 has a receiving cavity 2a and an air duct 2b. A cooling medium is received in the receiving cavity 2a, and the air duct 2b penetrates through the cold plate 2; the box body 1 has an air inlet 12 and an air outlet 13, and the air duct 2b is communicated with the air inlet 12 and the air outlet 13. Among them, the cooling medium can be a coolant or a refrigerant, preferably a coolant. The air inlet 12 and the air outlet 13 are arranged on two opposite side walls of the box body 1. The shapes of the air inlet 12 and the air outlet 13 can be square, circular, diamond-shaped, etc., and the present application does not limit the shapes of the air inlet 12 and the air outlet 13.

[0058] As Figure 3 and Figure 4 shown, the coolant in the receiving cavity 2a can absorb the heat generated by the battery cell 4, thereby reducing the temperature of the battery cell 4. Further, the coolant can undergo a phase change when the temperature is relatively high, changing from a liquid state to a gaseous state, thereby absorbing more heat and making the cooling effect of the cooling component better.

[0059] The air duct 2b is communicated with the air inlet 12 and the air outlet 13. Therefore, the path of air flow is: the outside air flows into the air duct 2b from the air inlet 12 and then flows out from the air outlet 13 after flowing through the air duct 2b. During the process of the air flowing through the cold plate 2, the air flowing into the air duct 2b from the air inlet 12 has a lower temperature, and after absorbing the heat from the battery cell 4 in the air duct 2b, the air flowing out from the air outlet 13 has a higher temperature, so as to realize taking away the heat generated by the battery cell 4 through the continuously flowing outside air ( Figure 4The arrows in [it] show the flow direction of air in the air duct). At the same time, the outside air flows through the air duct 2b to lower the temperature of the cold plate 2, and can also convert the coolant that has turned into a gaseous state back into a liquid state to repeatedly absorb the heat dissipated by the battery cells. That is, after the heat generated by the battery cells 4 is absorbed by the cold plate 2, a part of it is directly carried away by the flowing air through air cooling, and another part is absorbed by the coolant through liquid cooling. After the coolant becomes gaseous, its heat can also be carried away by the flowing air and thus becomes liquid again.

[0060] By setting two cooling methods of liquid cooling and air cooling, the temperature of the battery cells 4 will not be too high during operation, so that the lifespan of the battery cells 4 will not be affected, and the battery cells 4 will not undergo thermal runaway, thereby improving the safety of the battery pack.

[0061] At the same time, since the cooling effect of the combined liquid cooling and air cooling method is good, when the battery pack is used in a vehicle, there is no need to externally connect a vehicle thermal management system, thereby reducing the design difficulty of the thermal management system and facilitating the assembly of the battery pack and the vehicle body. In other words, such a design of the cooling component is particularly suitable for the design of small power battery packs, such as battery packs for electric motorcycles, drones, etc.

[0062] Specifically, a plurality of cold plates 2 can be arranged in the box body 1. For example, a plurality of cold plates 2 can be arranged side by side in the lateral direction of the box body 1, and the battery cells 4 are placed between the cold plates 2 and between the cold plates 2 and the side wall of the box body 1. The larger surface of the cold plate 2 and the larger surface of the battery cell 4 are parallel, so that the contact area between the battery cell 4 and the cold plate 2 is larger, and the cooling effect of the cold plate 2 on the battery cell 4 is better. A heat-conducting adhesive can be applied between the battery cell 4 and the cold plate 2 to make the heat transfer efficiency between the battery cell 4 and the cold plate 2 higher. It can be understood that the number and arrangement of the cold plates 2 are not limited to Figure 3 the form shown in [it], and the present application does not limit the number of the cold plates 2, the arrangement method, and the number of the battery cells 4 between the cold plates 2.

[0063] In addition, both the cold plate 2 and the box body 1 can use metal materials. In addition to having a good heat transfer effect, when the battery cell 4 accidentally undergoes thermal runaway, since the cold plate 2 and the box body 1 are not flammable, the spread of thermal runaway can be blocked.

[0064] In a specific embodiment, as Figure 4 shown, the cold plate 2 is hollow, and an accommodation cavity 2a is formed inside it.

[0065] In this embodiment, as Figure 4 shown, the accommodation cavity 2a can be surrounded by at least a part of the peripheral wall of the hollow structure and a part of the side wall of the box body 1. Enclosing the accommodation cavity 2a in this form can facilitate the production of the cold plate 2 and reduce the production difficulty of the cold plate 2. Among them, when the cold plate 2 is not installed on the box body 1, the hollow structure is communicated with the outside.

[0066] Specifically, the cold plate 2 is connected to the box body 1 by welding. After welding, the gap between the cold plate 2 and the box body 1 is sealed, so as to prevent the coolant in the accommodation cavity 2a from leaking. Alternatively, the accommodation cavity 2a can also be formed by the cold plate 2 alone, and then the cold plate 2 is welded to the box body 1.

[0067] More specifically, as Figures 3 to 5 shown, a liquid injection port 11 is provided on the box body 1. The liquid injection port 11 is located on the side wall of the box body 1 and penetrates the side wall where it is located. When the cold plate 2 is installed into the box body 1, the liquid injection port 11 corresponds to the hollow structure, so that the liquid injection port 11 is communicated with the accommodation cavity 2a; the cooling assembly further includes a plugging member 3, and the plugging member 3 can plug the liquid injection port 11. The operator can inject the coolant into the accommodation cavity 2a through the liquid injection port 11, and seal the liquid injection port 11 with the plugging member 3 after injection to prevent the coolant from leaking from the liquid injection port 11. Among them, the plugging member 3 can be detachably connected to the liquid injection port 11 or directly welded to the liquid injection port 11. The shape of the liquid injection port 11 can be square, circular, diamond-shaped, etc., and the application does not limit the shape of the liquid injection port 11.

[0068] Furthermore, as Figure 6 、 Figure 7 and Figure 9 shown, the cold plate 2 includes an air inlet part 21, a transition part 22 and a cooling part 23. Among them, the air inlet part 21 of the cold plate 2 is communicated with the air inlet 12 of the box body 1, and the transition part 22 connects the air inlet part 21 and the cooling part 23, so as to guide the air through the air duct 2b, so that the air is discharged from the air outlet 13 of the box body 1, and the heat generated by the battery pack is taken away during this process; the cooling part 23 is the main part of the cold plate 2 that contacts the battery cell 4, and the coolant therein absorbs heat, generates a phase change, and releases heat. Refer to Figure 6 In this embodiment, the cooling part 23 can be the plate body part of the cold plate 2 that has a relatively large contact area with the battery cell 4.

[0069] Specifically, as Figure 9 shown, the cooling part 23 has a through channel 232, and the transition part 22 and the channel 232 enclose a hollow structure.

[0070] Since the formation of the through channel 232 is of relatively low difficulty, by dividing the cold plate 2 into two parts, namely the transition part 22 and the cooling part 23, the production difficulty of the cold plate 2 is reduced. The transition part 22 is welded to the cooling part 23, so that the opening of the channel 232 facing the transition part 22 is sealed by the transition part 22. At the same time, the cold plate 2 is welded inside the box body 1, and the opening of the channel 232 facing away from the transition part 22 is sealed by the side wall of the box body 1, so that the coolant will not leak.

[0071] Among them, the width of the cooling part 23 is greater than that of the transition part 22, so that the extension length of the channel 232 is longer, and then the volume of the accommodation cavity 2a is larger, the cooling capacity of the cold plate 2 is stronger, and the cooling effect on the battery cell 4 is better.

[0072] In a specific embodiment, as Figure 6 , Figure 7 and Figure 9 shown, the air duct 2b includes a first air duct 211, a second air duct 221 and a third air duct 231 that are connected in sequence. The first air duct 211 is arranged in the air inlet part 21, the second air duct 221 is arranged in the transition part 22, and the third air duct 231 is arranged in the cooling part 23.

[0073] In this embodiment, by dividing the air duct 2b with a longer length into the first air duct 211, the second air duct 221 and the third air duct 231, the lengths of the first air duct 211, the second air duct 221 and the third air duct 231 are all shorter, thereby reducing the difficulty of forming the air duct 2b and facilitating the production of the cold plate 2.

[0074] Among them, the transition part 22 mainly plays a role in connecting the air inlet part 21 and the cooling part 23. The extension directions of the second air duct 221 and the third air duct 231 are the same, and are both parallel to the extension direction of the channel 232. The pipe diameters of the second air duct 221 and the third air duct 231 are the same.

[0075] Specifically, the air inlet part 21 can be formed by machining or produced by casting. The cooling part 23 can be formed by an aluminum extrusion process.

[0076] In a specific embodiment, as Figure 4 and Figure 6 shown, the cold plate 2 is provided with an avoidance groove 212 for avoiding the tabs of the battery cell 4, so as to facilitate the installation of the battery cell 4 in the box 1.

[0077] Preferably, the avoidance groove 212 is arranged in the air inlet part 21 so that the arrangement of the avoidance groove 212 does not affect the volume of the accommodation cavity 2a or has a small impact on the volume of the accommodation cavity 2a.

[0078] Furthermore, as Figure 4 and Figure 9 shown, the first air duct 211 includes a first sub-air duct 211a and a second sub-air duct 211b that are connected. The extension directions of the first sub-air duct 211a and the second sub-air duct 211b are different to facilitate guiding the air to flow from the air inlet part 21 to the cooling part 23.

[0079] One end of the first sub-air duct 211a is connected to the air inlet 12, and the other end is connected to the second sub-air duct 211b. The end of the second sub-air duct 211b that is not connected to the first sub-air duct 211a is connected to the second air duct 221. By changing the installation height of the first sub-air duct 211a, space can be reserved for the installation of the avoidance groove 212.

[0080] The second air duct 221 and the third air duct 231 are located above the accommodation cavity 2a in the height direction, and the first air duct 211 is located on one side of the accommodation cavity 2a in the width direction. Therefore, by dividing the first air duct 211 into the first sub-air duct 211a and the second sub-air duct 211b with different extension directions, the air inlet 12 and the air outlet 13 can be located at different heights, and at the same time, it is convenient for the production and processing of the air inlet part 21.

[0081] Furthermore, the diameter of the second sub-air duct 211b is smaller than that of the third air duct 231, so that the speed of the air flowing through the third air duct 231 is less than the speed of flowing through the second sub-air duct 211b, and further, more heat can be carried away when the air flows through the third air duct 231.

[0082] Specifically, the air inlet part 21 is welded to the transition part 22, so as to block the opening of the second sub-air duct 211b facing the transition part 22 and connect the second air duct 221 with the second sub-air duct 211b.

[0083] Preferably, the extension direction of the first sub-air duct 211a and the extension direction of the second sub-air duct 211b are perpendicular to each other.

[0084] In addition, as Figure 4 and Figure 7 shown, the second sub-air duct 211b can extend to the bottom of the air inlet part 21 in the height direction, so as to reduce the weight of the air inlet part 211 and improve the overall energy density of the battery pack. It can be understood that the second sub-air duct 211b can also only extend to the height where the first sub-air duct 211a is located.

[0085] In the present application, only by dividing the cold plate 2 into three parts: the air inlet part 21, the transition part 22 and the cooling part 23, the difficulty of forming the accommodation cavity 2a and the air duct 2b can be effectively reduced, and the production cost of the cold plate 2 can be reduced.

[0086] In a specific embodiment, as Figure 8 and Figure 9 shown, the cold plate 2 has a heat dissipation part 233, and the heat dissipation part 233 is located on the side of the accommodation cavity 2a close to the third air duct 231. The coolant in the accommodation cavity 2a evaporates after absorbing heat and moves upward in the direction of the third air duct 231. The gaseous coolant is in full contact with the heat dissipation part 233, and the heat is transferred from the heat dissipation part 233 to the third air duct 231 and carried away by the flowing air, so that the gaseous coolant condenses and drips.

[0087] A third air duct 231, a channel 232 and a heat dissipation part 233 are arranged in the cooling part 23. The channel 232 is parallel to the surface of the battery cell 4 with a larger area and can be used to store the coolant. The heat dissipation part 233 is located on one side of the channel 232 close to the third air duct 231. If the coolant is a gas-liquid two-phase liquid, after the cold plate 2 absorbs the heat of the battery cell, the coolant in the channel 232 evaporates to the heat dissipation part 233. The heat dissipation part 233 can accelerate the evaporation of the coolant and re-condense it into a liquid. The heat dissipation part 233 can be heat dissipation fins or the like. The third air duct 231 is arranged above the heat dissipation part 233. The third air duct 231 further accelerates the evaporation of the coolant and condenses it, so that it returns to the inside of the cold plate 2 again to complete the heat exchange. Only Figure 8 this example is used for illustration.

[0088] Specifically, as Figure 8 shown, the heat dissipation part 233 includes a plurality of protrusions protruding into the accommodation cavity 2a. The protrusion structure can increase the contact area with the gaseous coolant and improve the heat transfer efficiency. It can be understood that the present application does not limit the shape, quantity and arrangement mode of the heat dissipation part 233.

[0089] In the above embodiment, the battery pack further includes a box cover 6. The box cover 6 covers the box body 1 and plays a protective role for the battery cells 4, the cold plate 2, the electrical components 5 and other structures in the box body 1.

[0090] The assembly process of the battery pack is as follows: The cold plate 2 is welded in the box body 1 to connect the first air duct 211 with the air inlet 12, seal the third air duct 231 with the air outlet 13, and connect the liquid injection port 11 with the accommodation cavity 2a. After ensuring that the accommodation cavity 2a does not leak, the coolant is injected into the accommodation cavity 2a through the liquid injection port 11, and the liquid injection port 11 is blocked with the blocking member 3. Finally, the battery cells 4 and the electrical components 5 are installed in the box body 1, and the box cover 6 is covered.

[0091] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cooling component of a battery pack, characterized in that, The cooling assembly includes: a box body (1) and a cold plate (2). The cold plate (2) is disposed inside the box body (1). The cold plate (2) has a receiving cavity (2a) and an air duct (2b). A cooling medium is received in the receiving cavity (2a), and the air duct (2b) penetrates through the cold plate (2). The box body (1) has an air inlet (12) and an air outlet (13), and the air duct (2b) communicates with the air inlet (12) and the air outlet (13).

2. The cooling component of the battery pack according to claim 1, characterized in that, The cold plate (2) has a hollow structure, and the receiving cavity (2a) is formed inside the hollow structure.

3. The cooling component of the battery pack according to claim 2, wherein, The cold plate (2) includes an air inlet portion (21), a transition portion (22), and a cooling portion (23). The air inlet portion (21) communicates with the air inlet (12), and the transition portion (22) connects the air inlet portion (21) and the cooling portion (23) so that air flows from the air inlet portion (21) to the cooling portion (23).

4. The cooling component of the battery pack according to claim 3, characterized in that, The air duct (2b) includes a first air duct (211), a second air duct (221), and a third air duct (231) that are connected in sequence. The first air duct (211) is disposed in the air inlet portion (21), the second air duct (221) is disposed in the transition portion (22), and the third air duct (231) is disposed in the cooling portion (23).

5. The cooling assembly of the battery pack according to claim 4, characterized in that, The cooling portion (23) has a through channel (232), and the extending direction of the channel (232) is the same as that of the third air duct (231). The transition portion (22) and the channel (232) enclose the hollow structure.

6. The cooling assembly of the battery pack according to claim 4, wherein The first air duct (211) includes a first sub-air duct (211a) and a second sub-air duct (211b) that are connected. The extending directions of the first sub-air duct (211a) and the second sub-air duct (211b) are different to facilitate guiding air to flow from the air inlet portion (21) to the cooling portion (23).

7. The cooling component of the battery pack according to claim 4, characterized in that, The cold plate (2) has a heat dissipation portion (233), and the heat dissipation portion (233) is located on one side of the receiving cavity (2a) close to the third air duct (231).

8. The cooling assembly of the battery pack according to claim 7, wherein, The heat dissipation portion (233) includes a plurality of protrusions protruding towards the inside of the receiving cavity (2a).

9. The cooling assembly of the battery pack according to any one of claims 1-8, characterized in that, A liquid injection port (11) is provided on the box body (1), and the liquid injection port (11) communicates with the receiving cavity (2a). The cooling assembly further includes a plugging member (3), and the plugging member (3) can plug the liquid injection port (11).

10. A battery pack, characterized in that, The battery pack includes: a battery cell (4) and a cooling assembly, and the cooling assembly is the cooling assembly of the battery pack according to any one of claims 1-9.

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