Cooling assembly and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a cooling assembly and a battery pack, and the cooling assembly comprises a first cooling plate, a second cooling plate, a third cooling plate and a fourth cooling plate. The first cooling plate is provided with a first cavity, the first cavity is provided with a water inlet hole, the second cooling plates are arranged at intervals in the first direction, second cavities are formed in the second cooling plates, and the second cavities communicate with the first cavity; third cavities are formed in the third cooling plates, the two third cooling plates are arranged on the two opposite sides of the second cooling plate in the length direction correspondingly, the length direction of the third cooling plates is parallel to the first direction, and the third cavities communicate with the second cavities; the fourth cooling plate is arranged at one ends of the two third cooling plates, the fourth cooling plate is provided with a fourth cavity, the third cavity is communicated with the fourth cavity, the length direction of the fourth cooling plate is perpendicular to the first direction, the fourth cavity is provided with a water outlet, the contact area between the cooling assembly and the battery can be greatly increased, and the cooling efficiency is improved.

Description

TECHNICAL FIELD

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

[0002] In the field of new energy vehicles, with the continuous progress of technology and the increasing maturity of the market, the performance requirements for battery systems are becoming increasingly stringent, especially in terms of energy density, safety, and charging efficiency. In recent years, in order to further improve the endurance and driving experience of electric vehicles, CTC (Cell to Chassis) technology has emerged as an innovative design solution. This technology integrates battery modules directly with the chassis structure, achieving high modularity and integration, effectively improving the volume utilization of the vehicle and enhancing the overall safety of the battery system. However, while fast charging technology can significantly shorten charging time and improve user experience, it also brings unprecedented pressure on the thermal management of the battery system. During the fast charging process, a large amount of heat is generated inside the battery, which, if not effectively dissipated in time, will cause the battery temperature to rise rapidly, affecting battery performance, shortening service life, and even causing serious safety problems such as thermal runaway and explosion.

[0003] Currently, the common battery pack cooling solution on the market mainly relies on arranging liquid cooling plates at the bottom of the battery pack for cooling. Although this traditional method can alleviate the temperature rise problem of the battery to some extent, the cooling area of the bottom liquid cooling plate is relatively limited and difficult to cover the entire battery pack, especially in the CTC scheme, where the battery modules are tightly integrated with the chassis, limiting the layout space of the cooling system. UTILITY MODEL CONTENT

[0004] Therefore, the present application provides a cooling assembly and a battery pack to solve the problem of limited cooling area of the battery pack.

[0005] In a first aspect, the application provides a cooling assembly, comprising a first cooling plate, a second cooling plate, a third cooling plate and a fourth cooling plate. The first cooling plate is provided with a first chamber, and the first chamber is provided with a water inlet hole. The second cooling plate is provided with a plurality of second cooling plates, and the plurality of second cooling plates are arranged in a first direction. The first direction is parallel to the water inlet direction of the first chamber. The second cooling plate is provided in a long strip-shaped plate structure, and the length direction of the second cooling plate is perpendicular to the first direction. The second cooling plate is provided with a second chamber, and the second chamber is in communication with the first chamber. The third cooling plate is provided with two third cooling plates, and the two third cooling plates are arranged on the two opposite sides of the length direction of the second cooling plate. The third cooling plate is provided in a long strip-shaped plate structure, and the length direction of the third cooling plate is parallel to the first direction. The third cooling plate is provided with a third chamber, and the third chamber is in communication with the second chamber. The fourth cooling plate is arranged at one end of the two third cooling plates. The fourth cooling plate is provided with a fourth chamber, and the third chamber is in communication with the fourth chamber. The fourth cooling plate is provided in a long strip-shaped plate structure, and the length direction of the fourth cooling plate is perpendicular to the first direction. The fourth chamber is provided with a water outlet hole.

[0006] Beneficial effects: The mutual communication of the first cooling plate, the second cooling plate, the third cooling plate and the fourth cooling plate can realize the circulation of the cooling liquid. The second cooling plate is provided with a plurality of second cooling plates and can be arranged alternately with the battery. The two large-area sides of each battery can be cooled. At the same time, the first cooling plate, the third cooling plate and the fourth cooling plate surround the outside of the battery. The three sides of the battery are wrapped, and the cooling liquid in the plurality of second cooling plates can be discharged to realize the circulation of the cooling liquid. The overall cooling of the battery is realized, and the cooling efficiency is greatly improved. The plurality of second cooling plates form a plurality of gaps, and the battery is inserted into the gap. The limiting effect of the battery is also realized, and the stability is improved.

[0007] In an optional embodiment, the cross-sectional area of the first chamber perpendicular to the first direction gradually decreases along the first direction.

[0008] Beneficial effects: The first chamber of the first cooling plate is provided in a tapered structure along the first direction. The uniformity of the cooling liquid flow rate in each second chamber can be ensured, and the temperature difference between the batteries is reduced. The cross-sectional area of the front end of the first chamber is increased to slow down the internal cooling liquid flow rate. The cross-sectional area of the rear end is reduced to speed up the internal cooling liquid flow rate. It is avoided that the cooling liquid in the second cooling plate corresponding to the front end of the first chamber has been exhausted, while the cooling liquid in the second cooling plate corresponding to the rear end has not entered the second chamber.

[0009] In an alternative embodiment, the lower surface of the first cooling plate is provided with a plurality of first flow distribution holes, and the plurality of first flow distribution holes are arranged at intervals along the water inlet direction of the first chamber, and the length direction of the first flow distribution holes is perpendicular to the first direction.

[0010] The upper surface of the second cooling plate is provided with second flow distribution holes, and the second cooling plate is provided in one-to-one correspondence with the first flow distribution holes, and the first flow distribution holes and the second flow distribution holes are in communication.

[0011] Beneficial effects: The first flow distribution holes and the second flow distribution holes are in communication, and the cooling liquid can flow from the first chamber into the second chamber.

[0012] In an alternative embodiment, the length direction of the second cooling plate is provided with first flow collection holes at both ends.

[0013] The side wall of the third cooling plate along the length direction is provided with a plurality of second flow collection holes, and the plurality of second flow collection holes are arranged at intervals along the first direction, and the second cooling plate is provided in one-to-one correspondence with the second flow collection holes, and the first flow collection holes and the second flow collection holes are in communication.

[0014] Beneficial effects: The first flow collection holes are arranged at both ends of the second cooling plate, and the two first flow collection holes are in communication with the two second flow collection holes, respectively, so that the cooling liquid in the second cooling plate can be distributed, which not only increases the flow rate of the cooling liquid, but also reduces the temperature difference of each part of the battery, avoids the different aging degrees of different positions of the battery, and prolongs the service life.

[0015] In an alternative embodiment, the length direction of the third cooling plate is provided with first flow collection holes at one end.

[0016] The length direction of the fourth cooling plate is provided with second flow collection holes at both ends, and the first flow collection holes and the second flow collection holes are in communication.

[0017] Beneficial effects: The second flow collection holes are arranged at both ends of the fourth cooling plate, and are in communication with the first flow collection holes on the two third cooling plates, respectively, so that the cooling liquid after cooling the battery can be collected. The overall cooling liquid is returned through one water outlet hole, which can reduce the manufacturing cost and simplify the structure.

[0018] In an alternative embodiment, the outer side surface parallel to the thickness direction of the first cooling plate is provided with the water inlet hole, the axis direction of the water inlet hole is perpendicular to the outer side surface of the first cooling plate, and the water inlet hole is located at the center position of the outer side surface of the first cooling plate.

[0019] Beneficial effects: the axis direction of the water inlet hole is perpendicular to the outer side of the first cooling plate, i.e. consistent with the first direction, which can avoid hindering the cooling liquid entering from the water inlet hole and ensure smooth flow. The water inlet hole is located at the center of the outer side of the first cooling plate, which can ensure the flow rate and flow of the cooling liquid entering the first chamber to be relatively consistent, thereby reducing the temperature difference of each part of the battery.

[0020] In an alternative embodiment, an outer side parallel to the length direction of the second cooling plate is provided with the water outlet hole, and the axis direction of the water outlet hole is perpendicular to the outer side of the fourth cooling plate; and / or, the fourth cooling plate is arranged at one end of the two third cooling plates close to the water inlet hole.

[0021] Beneficial effects: the axis direction of the water outlet hole is perpendicular to the outer side of the second cooling plate, i.e. consistent with the first direction, which can avoid hindering the cooling liquid flowing out from the water outlet hole and ensure smooth flow. The fourth cooling plate is arranged at one end of the two third cooling plates close to the water inlet hole, which can facilitate the layout of the water inlet and outlet pipelines and improve the space utilization.

[0022] In an alternative embodiment, the cross-sectional area of the second cooling plate along the first direction decreases from top to bottom along the width direction of the second cooling plate.

[0023] Beneficial effects: the second cooling plate has a wedge-shaped structure, which not only facilitates insertion into the middle of the battery, but also serves as a limiting function for the battery.

[0024] In a second aspect, the application further provides a battery pack, comprising at least one battery group, a cooling assembly and a box body, the battery group comprising a plurality of batteries arranged at intervals along the first direction of the cooling assembly. The plurality of batteries in each battery group are arranged alternately with the plurality of second cooling plates of the cooling assembly. The plurality of batteries are arranged in the box body, the box body is provided with an open end, and the first cooling plate of the cooling assembly is arranged at the open end of the box body.

[0025] Beneficial effects: because the battery pack comprises a cooling assembly, it has the same effects as the cooling assembly, which will not be described here.

[0026] In an alternative embodiment, the battery comprises an explosion-proof valve, and the explosion-proof valve is arranged on the side of the battery away from the first cooling plate.

[0027] Beneficial effects: setting the explosion-proof valve on the side of the battery away from the first cooling plate can avoid the influence of the first cooling plate on the use and installation and maintenance of the explosion-proof valve. At the same time, the battery explosion-proof valve is below and not directly opposite the passenger compartment, which can effectively reduce the risk of passengers riding; and the lower part of the battery is not provided with a liquid cooling plate, so that the battery will not directly impact the cooling plate after the valve is opened due to thermal runaway, reducing the risk of short circuit caused by cooling liquid leakage. And the bottom guard plate of the box body can be made of honeycomb composite board or arranged with resin insulating sheet to prevent the battery from contacting the metal bottom guard plate. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed to be used in the description of the specific embodiments or prior art will be briefly introduced. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Fig. 1 A structural schematic diagram of a cooling assembly according to an embodiment of the present application;

[0030] Fig. 2 A structural schematic diagram of a battery pack according to an embodiment of the present application;

[0031] Fig. 3 An exploded view of a battery pack according to an embodiment of the present application.

[0032] Explanation of reference signs:

[0033] 1, first cooling plate; 2, second cooling plate; 3, third cooling plate; 4, fourth cooling plate; 5, battery; 6, box body; 7, water inlet hole; 8, water outlet hole. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0035] The embodiments of the present application will be described below in combination with Figs. 1-3 .

[0036] According to the embodiment of the present application, in one aspect, a cooling assembly is provided, comprising a first cooling plate 1, a second cooling plate 2, a third cooling plate 3 and a fourth cooling plate 4. The first cooling plate 1 is provided with a first chamber, and the first chamber is provided with a water inlet hole 7. The second cooling plate 2 is provided with a plurality of second cooling plates 2, and the plurality of second cooling plates 2 are arranged in a first direction. The first direction is parallel to the water inlet direction of the first chamber. The second cooling plate 2 is arranged in a long strip-shaped plate structure, and the length direction of the second cooling plate 2 is perpendicular to the first direction. The second cooling plate 2 is provided with a second chamber, and the second chamber is communicated with the first chamber. The third cooling plate 3 is provided with two third cooling plates 3, and the two third cooling plates 3 are arranged at two opposite sides of the length direction of the second cooling plate 2. The third cooling plate 3 is arranged in a long strip-shaped plate structure, and the length direction of the third cooling plate 3 is parallel to the first direction. The third cooling plate 3 is provided with a third chamber, and the third chamber is communicated with the second chamber. The fourth cooling plate 4 is arranged at one end of the two third cooling plates 3. The fourth cooling plate 4 is provided with a fourth chamber, and the third chamber is communicated with the fourth chamber. The fourth cooling plate 4 is arranged in a long strip-shaped plate structure, and the length direction of the fourth cooling plate 4 is perpendicular to the first direction. The fourth chamber is provided with a water outlet hole 8.

[0037] Optionally, referring to Fig. 1 , the cooling liquid can flow into the first chamber through the water inlet hole 7 and flow along the first direction. The cooling liquid enters the plurality of second cooling plates 2. The cooling liquid in the second cooling plate 2 flows downward along a direction perpendicular to the first direction and flows into the two third cooling plates 3 at two ends of the second cooling plate 2, respectively. The cooling liquid in the two third cooling plates 3 converges into the fourth cooling plate 4 and flows out of the water outlet hole 8. By limiting the flow direction of the cooling liquid, at least three surfaces of the battery 5 can be cooled by the cooling assembly, and the cooling efficiency can be greatly improved.

[0038] It is particularly pointed out that the cooling assembly is not limited to being used only for cooling the battery 5. The cooling assembly can also be used to heat the battery 5 by introducing hot fluid when the external environment temperature is too low.

[0039] In the embodiment, the mutual communication of the first cooling plate 1, the second cooling plate 2, the third cooling plate 3 and the fourth cooling plate 4 can realize the circulation of the cooling liquid. The plurality of second cooling plates 2 are arranged in a staggered manner with the battery 5, which can realize the cooling of the two large-area sides of each battery 5. At the same time, the first cooling plate 1, the third cooling plate 3 and the fourth cooling plate 4 surround the outside of the battery 5, which not only realizes the three-surface wrapping of the battery 5, but also can guide the cooling liquid in the plurality of second cooling plates 2 out, realizing the circulation of the cooling liquid. The combination realizes the multi-surface cooling of the battery 5, and the cooling efficiency can be greatly improved. The plurality of second cooling plates 2 form a plurality of gaps, and the battery 5 is inserted into the gaps, which can also realize the limiting effect of the battery 5 and improve the stability.

[0040] In some embodiments, the connection mode of the first cooling plate 1, the second cooling plate 2, the third cooling plate 3 and the fourth cooling plate 4 can be welding, crimping and gluing, etc., which can ensure the sealing of the cooling assembly and prevent the cooling liquid from flowing into the battery pack.

[0041] In some embodiments, the cross-sectional area of the first chamber perpendicular to the first direction gradually decreases along the first direction.

[0042] Optionally, the first chamber, the second chamber, the third chamber and the fourth chamber can be set as a flat rectangular cavity structure matched with the shape of the first cooling plate 1, the second cooling plate 2, the third cooling plate 3 and the fourth cooling plate 4.

[0043] In this embodiment, the first chamber of the first cooling plate 1 is set as a tapered structure along the first direction, which can ensure the uniformity of the cooling liquid flow rate in each second chamber and reduce the temperature difference between the batteries 5. The increase of the cross-sectional area of the front end of the first chamber can slow down the internal cooling liquid flow rate, and the decrease of the cross-sectional area of the rear end can speed up the internal cooling liquid flow rate, which ensures that the cooling liquid at the same height drops at the same time, avoiding the situation that the cooling liquid at the front end of the first chamber has already finished, while the cooling liquid at the rear end has not yet entered the second chamber of the second cooling plate 2.

[0044] In some embodiments, the lower surface of the first cooling plate 1 is provided with a plurality of first shunt holes, and the plurality of first shunt holes are arranged at intervals along the water inlet direction of the first chamber, and the length direction of the first shunt hole is perpendicular to the first direction.

[0045] The upper surface of the second cooling plate 2 is provided with a second shunt hole, and the second cooling plate 2 is provided in one-to-one correspondence with the first shunt hole, and the first shunt hole and the second shunt hole are communicated.

[0046] Optionally, the first shunt hole is set as a long strip structure, and the second shunt hole is set as a long strip structure, and the length direction of the second shunt hole is consistent with the length direction of the first shunt hole.

[0047] Optionally, the length of the first shunt hole can be equal to the length of the second chamber.

[0048] Optionally, the second shunt hole can be set as a completely open upper end surface of the second chamber.

[0049] In this embodiment, the first shunt hole and the second shunt hole are communicated with each other, which can realize the flow of the cooling liquid from the first chamber to the second chamber, and the first shunt hole and the second shunt hole are both set as a long strip structure, which can increase the flow area of the cooling liquid, so that the cooling liquid in the first chamber can enter the second chamber uniformly and quickly.

[0050] In some embodiments, the two ends of the length direction of the second cooling plate 2 are respectively provided with a first collecting hole.

[0051] The side wall of the third cooling plate 3 in the length direction is provided with a plurality of second flow collection holes, the plurality of second flow collection holes are arranged in the first direction, the second cooling plate 2 is arranged in one-to-one correspondence with the second flow collection hole, and the first flow collection hole is in communication with the second flow collection hole.

[0052] Optionally, the first flow collection hole can be arranged as a completely open end face of the second chamber.

[0053] In the embodiment, the first flow collection hole is arranged at each end of the second cooling plate 2, and the two first flow collection holes are in communication with the two second flow collection holes, so that the cooling liquid in the second cooling plate 2 can be divided, and the flow rate of the cooling liquid can be increased.

[0054] In some embodiments, one end of the third cooling plate 3 in the length direction is provided with a first flow collection hole, and the first flow collection holes of the two third cooling plates 3 are located at the same end.

[0055] The two ends of the fourth cooling plate 4 in the length direction are respectively provided with second flow collection holes, and the first flow collection hole is in communication with the second flow collection hole.

[0056] Optionally, the first flow collection hole can be arranged as a completely open end face of the third chamber.

[0057] In the embodiment, the second flow collection hole is arranged at each end of the fourth cooling plate 4, and is in communication with the first flow collection hole on the two third cooling plates 3, so that the cooling liquid after cooling the battery 5 can be collected. The overall cooling liquid is returned through a water outlet hole 8, which can reduce the manufacturing cost and simplify the structure.

[0058] In some embodiments, a water inlet hole 7 is arranged on an outer side surface parallel to the thickness direction of the first cooling plate 1, the axis direction of the water inlet hole 7 is perpendicular to the outer side surface of the first cooling plate 1, and the water inlet hole 7 is located at the center position of the outer side surface of the first cooling plate 1.

[0059] Optionally, the water inlet hole 7 can also be arranged on the upper surface of the first cooling plate 1 close to the water inlet end, and located at the center position of the upper surface of the first cooling plate 1.

[0060] In the embodiment, the axis direction of the water inlet hole 7 is perpendicular to the outer side surface of the first cooling plate 1, that is, consistent with the first direction, which can avoid hindering the cooling liquid entering from the water inlet hole 7, and ensure smooth flow. The water inlet hole 7 is located at the center position of the outer side surface of the first cooling plate 1, which can ensure that the flow rate and flow of the cooling liquid entering the two third cooling plates 3 are the same, and reduce the temperature difference between the batteries 5.

[0061] In some embodiments, a water outlet hole 8 is arranged on an outer side surface parallel to the length direction of the second cooling plate 2, and the axis direction of the water outlet hole 8 is perpendicular to the outer side surface of the fourth cooling plate 4.

[0062] Optionally, a fourth cooling plate 4 is arranged at one end of the two third cooling plates 3 close to the water inlet hole 7. The fourth cooling plate 4 arranged at one end of the two third cooling plates 3 close to the water inlet hole 7 can facilitate the arrangement of the water inlet and outlet pipelines and improve the space utilization.

[0063] Optionally, the fourth cooling plate 4 is arranged at one end of the two third cooling plates 3 away from the water inlet hole 7.

[0064] Optionally, the water outlet hole 8 is located at the center of the outer side surface of the fourth cooling plate 4. The water outlet hole 8 located at the center of the outer side surface of the fourth cooling plate 4 can ensure that the flow rate and flow of the cooling liquid flowing out of the two third cooling plates 3 are the same, thereby reducing the temperature difference between the batteries 5.

[0065] Optionally, the water outlet hole 8 can also be arranged on the upper surface of the fourth cooling plate 4 and located near the center of the upper surface of the fourth cooling plate 4.

[0066] In this embodiment, the axis direction of the water outlet hole 8 is perpendicular to the outer side surface of the second cooling plate 2, that is, consistent with the first direction, which can avoid hindering the cooling liquid flowing out of the water outlet hole 8 and ensure smooth flow.

[0067] In some embodiments, the cross-sectional area of the second cooling plate 2 along the first direction decreases from top to bottom along the width direction of the second cooling plate 2.

[0068] In this embodiment, the second cooling plate 2 has a wedge-shaped structure, which not only facilitates insertion into the middle of the battery 5, but also can limit the battery 5.

[0069] According to the embodiments of the present application, in another aspect, a battery pack is also provided, which includes at least one battery group, a cooling assembly, and a box 6. The battery group includes a plurality of batteries 5 arranged at intervals along the first direction of the cooling assembly. The plurality of batteries 5 in each battery group are arranged alternately with the plurality of second cooling plates 2 of the cooling assembly. The plurality of batteries 5 are arranged in the box 6, the box 6 is provided with an open end, and the first cooling plate 1 of the cooling assembly is arranged at the open end of the box 6.

[0070] In this embodiment, because the battery pack includes the cooling assembly, it has the same effect as the cooling assembly, which will not be described here.

[0071] In some embodiments, the battery 5 includes an explosion-proof valve arranged on the side of the battery 5 away from the first cooling plate 1.

[0072] Beneficial effects: setting the explosion-proof valve on the side of the battery 5 away from the first cooling plate 1 can avoid the influence of the first cooling plate 1 on the use and installation and maintenance of the explosion-proof valve. At the same time, the explosion-proof valve of the battery 5 is below and not directly opposite the passenger compartment, which can effectively reduce the risk of the passengers riding; and the lower part of the battery 5 is not provided with a liquid cooling plate, so that the battery 5 will not directly hit the cooling plate after the thermal runaway valve is opened, reducing the risk of short circuit caused by cooling liquid leakage. And the bottom guard plate of the box body 6 can be made of honeycomb composite board or arranged with PC sheet and other measures to prevent the battery 5 from contacting the metal bottom guard plate.

[0073] In some embodiments, the plurality of batteries 5 are spaced apart along a first direction of the cooling assembly, and the length direction of the battery 5 is perpendicular to the first direction, and the plurality of batteries 5 are staggered with the plurality of second cooling plates 2 of the cooling assembly.

[0074] Optionally, the battery 5 needs to be positioned and placed into the box body 6 first during installation, and then the cooling assembly is placed.

[0075] In this embodiment, a plurality of gaps are formed between the plurality of second cooling plates 2, and the battery 5 is arranged in the gap, so that the staggered arrangement of the second cooling plate 2 and the battery 5 can achieve the limiting effect of the battery 5 and improve the stability.

[0076] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A cooling assembly, characterized by The cooling assembly comprises: a first cooling plate (1) provided with a first chamber, the first chamber being provided with a water inlet hole (7); a plurality of second cooling plates (2) arranged in a first direction, the first direction being parallel to the water inlet direction of the first chamber, the second cooling plates (2) being arranged in a long strip-shaped plate structure, the length direction of the second cooling plates (2) being perpendicular to the first direction, the second cooling plates (2) being provided with a second chamber, and the second chamber being in communication with the first chamber; two third cooling plates (3) provided with a third chamber, the two third cooling plates (3) being arranged on opposite sides of the length direction of the second cooling plates (2), the third cooling plates (3) being arranged in a long strip-shaped plate structure, the length direction of the third cooling plates (3) being parallel to the first direction, the third chamber being in communication with the second chamber; a fourth cooling plate (4) arranged at one end of the two third cooling plates (3), the fourth cooling plate (4) being provided with a fourth chamber, the third chamber being in communication with the fourth chamber, the fourth cooling plate (4) being arranged in a long strip-shaped plate structure, the length direction of the fourth cooling plate (4) being perpendicular to the first direction, and the fourth chamber being provided with a water outlet hole (8).

2. The cooling assembly according to claim 1, wherein: the cross-sectional area of the first chamber perpendicular to the first direction gradually decreases along the first direction.

3. The cooling assembly according to claim 1, wherein: the lower surface of the first cooling plate (1) is provided with a plurality of first shunt holes, and the first shunt holes are arranged in the water inlet direction of the first chamber; the upper surface of the second cooling plate (2) is provided with a second shunt hole, the second cooling plate (2) and the first shunt hole are arranged one by one, and the first shunt hole and the second shunt hole are in communication.

4. The cooling assembly according to claim 1, wherein: the two ends of the length direction of the second cooling plate (2) are respectively provided with a first collecting hole; the side wall of the third cooling plate (3) in the length direction is provided with a plurality of second collecting holes, the second collecting holes are arranged in the first direction, the second cooling plate (2) and the second collecting holes on the third cooling plate (3) are arranged one by one, and the first collecting hole and the second collecting hole are in communication.

5. The cooling assembly according to claim 1, wherein: one end of the length direction of the third cooling plate (3) is provided with a first collecting hole, and the first collecting holes of the two third cooling plates (3) are located at the same end; the two ends of the length direction of the fourth cooling plate (4) are respectively provided with a second collecting hole, and the first collecting hole and the second collecting hole are in communication.

6. The cooling assembly according to claim 1, wherein: The water inlet hole (7) is arranged on an outer side of the first cooling plate (1) in parallel with the thickness direction of the first cooling plate (1), the axis direction of the water inlet hole (7) is perpendicular to the outer side of the first cooling plate (1), and the water inlet hole (7) is located at the center position of the outer side of the first cooling plate (1).

7. The cooling assembly according to claim 1, characterized in that: The water outlet hole (8) is arranged on an outer side of the fourth cooling plate (4) in parallel with the length direction of the fourth cooling plate (4), the axis direction of the water outlet hole (8) is perpendicular to the outer side of the second cooling plate (2), and / or the fourth cooling plate (4) is arranged at one end of the two third cooling plates (3) close to the water inlet hole (7).

8. The cooling assembly according to claim 1, characterized in that: The cross-sectional area of the second cooling plate (2) in the first direction decreases from top to bottom along the width direction of the second cooling plate (2).

9. A battery pack, characterized by, Including: At least one battery pack, the battery pack comprising a plurality of batteries (5) arranged at intervals along the first direction of the cooling assembly; The cooling assembly according to any one of claims 1 to 8, the plurality of batteries (5) in each battery pack are arranged alternately with the plurality of second cooling plates (2) of the cooling assembly; A box (6), the plurality of batteries (5) are arranged in the box (6), the box (6) is provided with an open end, and the first cooling plate (1) of the cooling assembly is arranged at the open end of the box (6).

10. The battery pack according to claim 9, characterized in that: The battery (5) comprises an explosion-proof valve, and the explosion-proof valve is arranged on the side of the battery (5) away from the first cooling plate (1).

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