Liquid cooling heat dissipation structure and battery pack

Abstract

The utility model discloses a liquid cooling heat dissipation structure and a battery pack, the liquid cooling heat dissipation structure comprises a box body, the box body comprises two side plates which are oppositely arranged, and the interior of each side plate is a cavity; the battery module is arranged in the box body, the battery module comprises at least two battery columns which are arranged side by side, and the side parts, far away from each other, of the two battery columns are in contact with the two side plates respectively; the liquid cooling plates comprise a first liquid cooling plate, a second liquid cooling plate and a third liquid cooling plate, the first liquid cooling plate and the second liquid cooling plate are arranged in the cavities of the two side plates respectively, and the third liquid cooling plate is arranged between the two adjacent battery columns and makes contact with the side parts, close to each other, of the two corresponding battery columns. The interior of the side plate of the box body is of a cavity structure, so that the weight of the box body can be reduced, the first liquid cooling plate and the second liquid cooling plate can be integrated in the side plate to reduce the occupied space, and uniform heat dissipation of the battery module can be realized through the cooperation of the three liquid cooling plate structures; therefore, the battery pack has the characteristics of high space utilization rate, light weight and high energy density.

Description

TECHNICAL FIELD

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

[0002] With the progress and development of battery technology, the power and energy density of energy storage systems are rapidly increasing, which will significantly increase the heat generation of the battery monomer and the joule heat generation of the related connecting parts. Therefore, the heat dissipation problem of the energy storage system has become a key to improving its safety performance. The traditional heat management technology generally lays a liquid cooling plate at the bottom of the battery, which has the defects of small heat exchange area and limited heat dissipation capacity, and the temperature difference between the top and bottom of the battery is large, which is more likely to cause uneven temperature distribution and induce thermal runaway.

[0003] Publication No. CN216250871U discloses a battery system liquid cooling heat dissipation structure and a battery pack. A common first liquid cooling plate is arranged between two battery columns, and a second liquid cooling plate and a third liquid cooling plate are arranged on both sides of the two battery columns. The three liquid cooling plates directly form a cooling loop, and the double-sided tabs of the two battery columns are liquid-cooled and heat-dissipated by the three liquid cooling plates. In the case of ensuring the heat dissipation effect, the temperature difference of the battery monomer can be effectively controlled. However, the arrangement of the side liquid cooling plate occupies a large space in the battery pack, resulting in low space utilization of the battery pack and reducing the energy density of the battery pack. Practical new type content

[0004] To solve the above-mentioned defects in the prior art, the purpose of the present application is to provide a liquid cooling heat dissipation structure and a battery pack. The liquid cooling plate on the side is integrated in the side plate of the box body to reduce the occupied space, improve the space utilization of the battery pack, and improve the energy density of the battery pack.

[0005] The first aspect of the present application provides a liquid cooling heat dissipation structure, comprising:

[0006] A box body, the box body comprising two oppositely arranged side plates, the interior of the side plate being a cavity;

[0007] A battery module, the battery module being arranged in the box body, the battery module comprising at least two battery columns arranged side by side, the mutually remote sides of the two battery columns respectively contacting the two side plates;

[0008] A liquid cooling plate, the liquid cooling plate comprising a first liquid cooling plate, a second liquid cooling plate and a third liquid cooling plate, the first liquid cooling plate and the second liquid cooling plate being arranged in the cavities of the two side plates, respectively, and the third liquid cooling plate being arranged between the two adjacent battery columns and contacting the mutually close sides of the corresponding two battery columns.

[0009] As a preferred implementation, in the first aspect of the application, the first liquid cooling plate and the second liquid cooling plate are connected with the third liquid cooling plate to form a liquid cooling loop, and the first liquid cooling plate and the second liquid cooling plate are connected with the external cooling medium to form a circulation loop.

[0010] As a preferred implementation, in the first aspect of the application, the first liquid cooling plate and the second liquid cooling plate are connected with the third liquid cooling plate to form a liquid cooling loop, and the first liquid cooling plate and the second liquid cooling plate are connected with the external cooling medium to form a circulation loop.

[0011] The first liquid cooling plate is connected with the external cooling medium through the first water inlet pipe and the first water outlet pipe to form a circulation loop, and the second liquid cooling plate is connected with the external cooling medium through the second water inlet pipe and the second water outlet pipe to form a circulation loop.

[0012] As a preferred implementation, in the first aspect of the application, the first water inlet pipe, the first water outlet pipe, the second water inlet pipe and the second water outlet pipe are respectively arranged at the same side end of the corresponding first liquid cooling plate and second liquid cooling plate, and the first pipe and the second pipe are arranged at the opposite end.

[0013] As a preferred implementation, in the first aspect of the application, the third liquid cooling plate includes a first flow channel and a second flow channel, the first liquid cooling plate is connected with the first flow channel through the first pipe to form a first liquid cooling loop, and the second liquid cooling plate is connected with the second flow channel through the second pipe to form a second liquid cooling loop.

[0014] As a preferred implementation, in the first aspect of the application, the first pipe, the second pipe, the first water inlet pipe, the first water outlet pipe, the second water inlet pipe and the second water outlet pipe are all hoses, and are all connected with the corresponding first liquid cooling plate, second liquid cooling plate and third liquid cooling plate through water nozzles.

[0015] As a preferred implementation, in the first aspect of the application, the box body includes a bottom plate, two side plates are respectively arranged at opposite sides of the bottom plate, the third liquid cooling plate is fixed on the bottom plate and clamped between two adjacent battery columns, and the third liquid cooling plate is provided with at least one.

[0016] As a preferred implementation, in the first aspect of the application, a heat conduction layer is arranged between the battery module and the first liquid cooling plate, the second liquid cooling plate and the third liquid cooling plate, the heat conduction layer is arranged at the side of the third liquid cooling plate and the two side plates contacting the battery column, and extends to the bottom of the battery module.

[0017] The second aspect of the application provides a battery pack, comprising the above liquid cooling heat dissipation structure.

[0018] As a preferred implementation, in the second aspect of the application, both ends of the battery module in the extension direction are sequentially provided with an end plate and an expansion beam.

[0019] The liquid cooling heat dissipation structure and the battery pack provided by the application have the following technical effects.

[0020] The side plate of the box body is internally a cavity structure, which can reduce the weight of the box body, integrate the first liquid cooling plate and the second liquid cooling plate in the side plate to reduce the occupied space, and realize uniform heat dissipation of the battery module through cooperation of the three liquid cooling plate structures, so that the battery pack has the characteristics of high space utilization, light weight and high energy density. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a structural schematic diagram of the battery pack of the application;

[0022] Figure 2 FIG. 2 is an exploded view of the battery pack of the application;

[0023] Figure 3 FIG. 3 is an exploded view of the liquid cooling heat dissipation structure of the application;

[0024] Figure 4 FIG. 4 is an exploded view of the liquid cooling heat dissipation structure of the application without the battery module;

[0025] Figure 5 FIG. 5 is a structural schematic diagram of the liquid cooling plate of the application;

[0026] Figure 6 FIG. 6 is a sectional view of the liquid cooling heat dissipation structure of the application without the battery module.

[0027] REFERENCE NUMERALS:

[0028] 1, box body; 11, side plate; 12, bottom plate; 13, front plate; 14, rear plate; 2, battery module; 21, battery column; 3, liquid cooling plate; 31, first liquid cooling plate; 311, first pipeline; 312, first water inlet pipe; 313, first water outlet pipe; 32, second liquid cooling plate; 321, second pipeline; 322, second water inlet pipe; 323, second water outlet pipe; 33, third liquid cooling plate; 331, first flow channel; 332, second flow channel; 4, water nozzle; 5, heat conduction layer; 6, end plate; 7, expansion beam; 8, box cover. DETAILED DESCRIPTION

[0029] In order to better understand and implement, the technical solutions in the embodiments of the application will be clearly and completely described below in combination with the drawings in the embodiments of the application.

[0030] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0032] Referring to Figure 2 , Figure 3 and Figure 6 , the present application provides a liquid cooling heat dissipation structure, comprising a box body 1, a battery module 2 and a liquid cooling plate 3. The box body 1 comprises two oppositely arranged side plates 11, and the inside of the side plate 11 is a cavity. The battery module 2 is arranged in the box body 1, and the battery module 2 comprises at least two battery columns 21 arranged side by side, and the mutually remote sides of the two battery columns 21 respectively contact the two side plates 11. The liquid cooling plate 3 comprises a first liquid cooling plate 31, a second liquid cooling plate 32 and a third liquid cooling plate 33, the first liquid cooling plate 31 and the second liquid cooling plate 32 are respectively arranged in the cavities of the two side plates 11, and the third liquid cooling plate 33 is arranged between the adjacent two battery columns 21 and contacts the mutually close sides of the corresponding two battery columns 21.

[0033] The box body 1 is taken as an example of a square structure, the box body 1 comprises a front plate 13, a rear plate 14 and two oppositely arranged side plates 11, the front plate 13, the first side plate 11, the rear plate 14 and the other side plate 11 are sequentially connected end to end to form a frame structure, and the bottom of the frame structure is provided with a bottom plate 12 to connect and form a box body 1 with a receiving cavity. The battery module 2 is arranged in the receiving cavity of the box body 1, and the battery module 2 generally comprises two battery columns 21 arranged side by side, of course, according to the performance of the battery pack, the battery module 2 can also comprise three or more battery columns 21 arranged side by side. Each battery column 21 comprises a plurality of battery cells, for example, a square battery cell, and a plurality of battery cells are arranged in a row with their large faces contacting to form a battery column 21.

[0034] The third liquid cooling plate 33 is arranged between the adjacent two battery columns 21, and the side of the corresponding two side plates 11 of the battery module 2 is respectively provided with the first liquid cooling plate 31 and the liquid cooling plate 32, so that the battery module 2 is cooled by the first liquid cooling plate 31 and the second liquid cooling plate 32 on both sides and the third liquid cooling plate 33 in the middle, which is beneficial to the uniform cooling of the battery module 2 and avoids the formation of temperature difference, thereby reducing the occurrence of thermal runaway.

[0035] On this basis, the side plate 11 of the box body 1 is internally hollow, which can not only reduce the weight of the box body 1, but also integrate the first liquid cooling plate 31 and the second liquid cooling plate 32 in the cavity of the corresponding side plate 11, thereby reducing the space occupied by the liquid cooling plate 3, improving the space utilization rate in the box body 1, and reducing the overall weight of the box body 1.

[0036] The first liquid cooling plate 31 and the second liquid cooling plate 32 are connected with the third liquid cooling plate 33 to form a liquid cooling loop, and the first liquid cooling plate 31 and the second liquid cooling plate 32 are connected with an external cooling medium to form a circulation loop. After the external cooling medium enters the first liquid cooling plate 31 and the second liquid cooling plate 32, it flows through the third liquid cooling plate 33 and then flows out through the first liquid cooling plate 31 and the second liquid cooling plate 32. Compared with the cooling medium circulation loop arranged respectively in the first liquid cooling plate 31, the second liquid cooling plate 32 and the third liquid cooling plate 33, the present application can simplify the pipeline structure and reduce the space occupation rate.

[0037] Referring to Figure 4 and Figure 5 , the first liquid cooling plate 31 and the second liquid cooling plate 32 are connected with the third liquid cooling plate 33 through the first pipeline 311 and the second pipeline 321 to form a liquid cooling loop. The first liquid cooling plate 31 is connected with the external cooling medium through the first water inlet pipe 312 and the first water outlet pipe 313 to form a circulation loop, and the second liquid cooling plate 32 is connected with the external cooling medium through the second water inlet pipe 322 and the second water outlet pipe 323 to form a circulation loop. The first pipeline 311, the second pipeline 321, the first water inlet pipe 312, the first water outlet pipe 313, the second water inlet pipe 322 and the second water outlet pipe 323 are all flexible pipes, and are all connected with the corresponding first liquid cooling plate 31, second liquid cooling plate 32 and third liquid cooling plate 33 through the water nozzle 4. The water nozzle 4 of the first liquid cooling plate 31, the second liquid cooling plate 32 and the third liquid cooling plate 33 can be a straight-through interface, an elbow interface, a flange interface, a quick interface and the like, and the quick interface is preferred, which is convenient and quick to install. The first pipeline 311, the second pipeline 321, the first water inlet pipe 312, the first water outlet pipe 313, the second water inlet pipe 322 and the second water outlet pipe 323 are preferably flexible pipes, which can be deformed at will to facilitate connection. Of course, hard pipes can also be selected for connection. Moreover, the cooperation of the quick interface type water nozzle 4 and the flexible pipe can avoid the interference of the electrical elements in the box body 1, occupy small space, and have low installation difficulty.

[0038] Further, the first water inlet pipe 312, the first water outlet pipe 313, the second water inlet pipe 322 and the second water outlet pipe 323 are respectively arranged at the same side end of the corresponding first liquid cooling plate 31 and the second liquid cooling plate 32, and are arranged at the opposite end of the corresponding first pipe 311 and the second pipe 321. The first water inlet pipe 312, the first water outlet pipe 313, the second water inlet pipe 322 and the second water outlet pipe 323 are arranged close to the front plate 13 of the box body 1 and pass through the front plate 13 to connect the external cooling medium, and the first pipe 311 and the second pipe 321 are arranged at the opposite end, which can reduce the deformation such as winding and bending of the pipe, thereby simplifying the connection structure of the pipe.

[0039] The third liquid cooling plate 33 includes a first flow channel 331 and a second flow channel 332, and the first liquid cooling plate 31 is connected to the first flow channel 331 through the first pipe 311 to form a first liquid cooling circuit, and the second liquid cooling plate 32 is connected to the second flow channel 332 through the second pipe 321 to form a second liquid cooling circuit. The first liquid cooling circuit between the first liquid cooling plate 31 and the third liquid cooling plate 33 and the second liquid cooling circuit between the second liquid cooling plate 32 and the third liquid cooling plate 33 do not interfere with each other, and the arrangement of the double liquid cooling circuits can reduce the mass flow rate to reduce the pressure drop, and when a problem occurs in a certain circuit, it does not affect the other circuit, thereby ensuring the heat dissipation effect. The double liquid cooling circuits are realized by adjusting the structure of the third liquid cooling plate 33 and the connection position of the first liquid cooling plate 31 and the second liquid cooling plate 32, which can be divided into middle region and end region, or upper region and lower region, etc., as long as the first flow channel 331 and the second flow channel 332 can be distinguished.

[0040] Referring to Figure 4 and Figure 6 On the basis of the above structure, the box body 1 includes a bottom plate 12, two side plates 11 are respectively arranged at the opposite sides of the bottom plate 12, and the third liquid cooling plate 33 is fixed on the bottom plate 12 and clamped between the adjacent two battery columns 21, and the third liquid cooling plate 33 is provided with at least one. The third liquid cooling plate 33 can be welded and connected with the bottom plate 12. Generally, the third liquid cooling plate 33 is arranged at the middle position between the two side plates 11 to divide the accommodating cavity in the box body 1 into two parts, thereby accommodating the two battery columns 21. Of course, the battery column 21 can include three and more than three, according to the heat dissipation effect, the third liquid cooling plate 33 can be arranged between each adjacent two battery columns 21, and the position of the third liquid cooling plate 33 and the connection structure of the first liquid cooling plate 31 and the second liquid cooling plate 32 can be flexibly adjusted according to the position of the battery column 21. For example, when there are three battery columns 21, two third liquid cooling plates 33 are arranged, and the two third liquid cooling plates 33 can be connected with the first liquid cooling plate 31 and the second liquid cooling plate 32 respectively to form a liquid cooling circuit. When there are four battery columns 21, three third liquid cooling plates 33 can be arranged, and the first liquid cooling plate 31 and the second liquid cooling plate 32 can be connected with the third liquid cooling plate 33 at the corresponding side to form a respective liquid cooling circuit. And so on.

[0041] In addition, referring to Figure 3 and Figure 4 , the battery module 2 is provided with a heat conduction layer 5 between the first liquid cooling plate 31, the second liquid cooling plate 32 and the third liquid cooling plate 33. The heat conduction layer 5 is arranged at the side of the third liquid cooling plate 33 and the two side plates 11 contacting the battery column 21, and extends to the bottom of the battery module 2. The heat conduction layer 5 can be a heat conduction glue structure, which can perfect the contact and heat transfer path of the side of the battery module 2, the side plate 11 and the third liquid cooling plate 33, so that the heat conduction is more sufficient, thereby solving the problem of poor contact of the heat exchange surface, and being beneficial to improve the heat dissipation effect.

[0042] In addition to the above liquid cooling heat dissipation structure, referring to Figure 1 and Figure 2 , the application also provides a battery pack comprising the above liquid cooling heat dissipation structure. The battery pack comprises a box body 1 and a box cover 8 arranged on the box body 1. The inside of the side plate 11 of the box body 1 is a cavity structure, which can not only reduce the weight of the box body 1, but also integrate the first liquid cooling plate 31 and the second liquid cooling plate 32 in the side plate 11 to reduce the occupied space, and also can realize uniform heat dissipation of the battery module 2 through cooperation of the three liquid cooling plate structures, thereby achieving the characteristics of high space utilization, light weight and high energy density of the battery pack.

[0043] In addition, the two ends of the battery module 2 in the extension direction are sequentially provided with an end plate 6 and an expansion beam 7, which cooperate with the positioning effect of the third liquid cooling plate 3 on the battery module 2, so as to avoid the movement of the battery module 2, thereby improving the stability of the battery pack.

[0044] The technical means disclosed in the application scheme is not limited to the technical means disclosed in the above embodiments, but also includes the technical solutions composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principles of the application, some improvements and refinements can also be made, which are also considered within the protection scope of the application.

Claims

1. A liquid cooling heat dissipation structure, characterized in that, The utility model relates to a battery module liquid cooling device, including: A box (1) including two oppositely arranged side plates (11), the inside of the side plate (11) is a cavity; A battery module (2) is arranged in the box (1), the battery module (2) includes at least two battery columns (21) arranged side by side, and the mutually remote sides of the two battery columns (21) contact the two side plates (11) respectively; Liquid cooling plate (3), the liquid cooling plate (3) includes first liquid cooling plate (31), second liquid cooling plate (32) and third liquid cooling plate (33), the first liquid cooling plate (31) and the second liquid cooling plate (32) are arranged in the cavity of the two side plates (11) respectively, and the third liquid cooling plate (33) is arranged between adjacent two battery columns (21) and contacts the mutually close sides of the corresponding two battery columns (21).

2. The liquid cooling heat dissipation structure according to claim 1, characterized in that: The first liquid cooling plate (31) and the second liquid cooling plate (32) are connected with the third liquid cooling plate (33) to form a liquid cooling circuit, and the first liquid cooling plate (31) and the second liquid cooling plate (32) form a circulating loop with an external cooling medium.

3. The liquid cooling heat dissipation structure according to claim 2, characterized in that: The first liquid cooling plate (31) and the second liquid cooling plate (32) are connected with the third liquid cooling plate (33) to form a liquid cooling circuit through a first pipeline (311) and a second pipeline (321) respectively; The first liquid cooling plate (31) is connected with an external cooling medium to form a circulating loop through a first water inlet pipe (312) and a first water outlet pipe (313), and the second liquid cooling plate (32) is connected with an external cooling medium to form a circulating loop through a second water inlet pipe (322) and a second water outlet pipe (323).

4. The liquid cooling heat dissipation structure according to claim 3, characterized in that: The first water inlet pipe (312), the first water outlet pipe (313), the second water inlet pipe (322) and the second water outlet pipe (323) are arranged at the same side end of the corresponding first liquid cooling plate (31) and second liquid cooling plate (32) respectively, and are arranged at the opposite end of the corresponding first pipeline (311) and second pipeline (321).

5. The liquid cooling heat dissipation structure according to claim 3, characterized in that: The third liquid cooling plate (33) includes a first flow channel (331) and a second flow channel (332), the first liquid cooling plate (31) is connected with the first flow channel (331) through the first pipeline (311) to form a first liquid cooling circuit, and the second liquid cooling plate (32) is connected with the second flow channel (332) through the second pipeline (321) to form a second liquid cooling circuit.

6. The liquid cooling heat dissipation structure according to claim 3, characterized in that: The first pipeline (311), the second pipeline (321), the first water inlet pipe (312), the first water outlet pipe (313), the second water inlet pipe (322) and the second water outlet pipe (323) are all hoses, and are connected with the corresponding first liquid cooling plate (31), second liquid cooling plate (32) and third liquid cooling plate (33) through a water nozzle (4).

7. The liquid cooling structure according to any one of claims 1 to 6, characterized in that: The box (1) comprises a bottom plate (12), two side plates (11) are respectively arranged on opposite sides of the bottom plate (12), the third liquid cooling plate (33) is fixed on the bottom plate (12) and clamped between two adjacent battery columns (21), and the third liquid cooling plate (33) is provided with at least one.

8. The liquid cooling structure according to any one of claims 1 to 6, characterized in that: The battery module (2) is provided with a heat-conducting layer (5) between the first liquid cooling plate (31), the second liquid cooling plate (32) and the third liquid cooling plate (33), the heat-conducting layer (5) is arranged at the side of the third liquid cooling plate (33) and the two side plates (11) contacting the battery column (21), and extends to the bottom of the battery module (2).

9. A battery pack, characterized by, Comprise: The liquid cooling heat dissipation structure according to any one of claims 1-8.

10. The battery pack of claim 9, wherein: Both ends of the battery module (2) in the extension direction are sequentially provided with an end plate (6) and an expansion beam (7).

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