Battery pack box body with liquid cooling function

Abstract

The utility model relates to the technical field of battery packs, in particular to a battery pack box body with a liquid cooling function, which comprises a box body and an upper cover which can be buckled with each other, the box body comprises a frame body and a bottom plate which are connected with each other, an inner frame is arranged on the inner wall of the frame body close to the bottom plate, the inner wall of the inner frame forms a liquid cooling plate caulking groove, and the liquid cooling plate caulking groove is connected with the upper cover. A liquid cooling plate assembly is embedded in the liquid cooling plate caulking groove; the liquid cooling plate assembly comprises a first liquid cooling interface and a second liquid cooling interface which are arranged at two ends, and the first liquid cooling interface and the second liquid cooling interface respectively penetrate through the inner frame and the frame body and then extend outwards. According to the scheme, the structure is simple, the liquid cooling plate assembly can be quickly assembled only by connecting the liquid cooling plate assembly with the liquid cooling plate caulking groove, the space of the box body is not occupied, and the battery cell module can be effectively cooled.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a battery pack box body with a liquid cooling function. Background Art

[0002] At present, new energy vehicles have attracted wide attention from all sectors of society due to their excellent environmental protection performance, and the requirements for new energy vehicles are also constantly increasing. As a type of new energy vehicle, electric vehicles are also developing continuously in the direction of high safety, high energy ratio, and lightweight. The main factor determining the driving range of electric vehicles is the power supply battery. Different specifications of power supply batteries can be selected for different vehicle models to meet the driving requirements.

[0003] The power supply battery for electric vehicles is generally a battery pack composed of multiple battery cell modules, that is, multiple battery cell modules are stacked in the same box body, and then the individual battery cell modules are connected. As the core battery cell module, the corresponding number of battery cells is generally configured according to the magnitude of the voltage to be output, and then all the battery cells are connected to output the voltage.

[0004] As the core battery cell module, the corresponding number of battery cells is generally configured according to the magnitude of the voltage to be output, and then all the battery cells are connected to output the voltage. During the operation of the battery cell module, a large amount of heat will be released. If effective cooling and heat dissipation treatment are not carried out, it will affect the service life of the battery cell module at least, and at worst, safety accidents will be caused due to excessive temperature.

[0005] At present, most electric vehicle battery packs are equipped with a thermal management system, which is mainly divided into passive thermal management and active thermal management. Passive thermal management uses the natural cooling of the battery pack; active thermal management mainly includes air cooling, liquid cooling, and phase change material cooling. In practice, air cooling and water cooling systems are generally used. The performance of air cooling in terms of temperature uniformity is not ideal. Generally, the processing technology requirements for the water cooling pipes of the water cooling system are high, the cost is high, the pipe wall of the water cooling pipe is thin, and there is a risk of rupture of the water cooling pipe and leakage of liquid when the battery pack vibrates violently, and there is also a risk of rupture when the vehicle encounters a collision.

[0006] Therefore, a new technical solution is urgently needed to solve the above technical problems. Summary of the Utility Model

[0007] The purpose of the utility model is to overcome the problems of the above-mentioned existing technologies, and provides a battery pack box body with a liquid cooling function, which is used to solve the technical problems that the air cooling used to cool the battery cell module in the traditional technology has unsatisfactory temperature uniformity performance, the water cooling pipes of the water cooling system have high processing technology requirements and high costs, and the pipe walls of the water cooling pipes are thin and easy to rupture, resulting in coolant leakage.

[0008] The above purpose is achieved by the following technical solutions:

[0009] A battery pack box body with a liquid cooling function, comprising a box body and an upper cover that can be buckled with each other. The box body includes a frame body and a bottom plate that are connected to each other. An inner frame is arranged at a position on the inner wall of the frame body adjacent to the bottom plate. The inner wall of the inner frame forms a liquid cooling plate slot, and a liquid cooling plate assembly is embedded in the liquid cooling plate slot; the liquid cooling plate assembly includes a first liquid cooling interface and a second liquid cooling interface arranged at both ends. The first liquid cooling interface and the second liquid cooling interface respectively penetrate through the inner frame and the frame body and then extend outwards.

[0010] Further, the liquid cooling plate assembly includes a liquid cooling plate body that matches the shape of the liquid cooling plate slot. A liquid cooling channel is arranged in the liquid cooling plate body. The liquid inlet end of the liquid cooling channel is connected to the first liquid cooling interface, and the liquid outlet end of the liquid cooling channel is connected to the second liquid cooling interface.

[0011] Further, a fin group is arranged in the liquid cooling channel. The fin group includes a plurality of fins, and a single coolant channel is formed between adjacent fins.

[0012] Further, the liquid cooling channel is in an S shape. Correspondingly, the fin group is arranged in an S shape in the liquid cooling channel.

[0013] Further, the frame body is a rectangular frame body, including symmetrically arranged side beam plates and end beam plates arranged at both ends of the two side beam plates. Splicing chamfers are opened at both ends of the side beam plates and the end beam plates.

[0014] Further, the inner frame is a rectangular inner frame, including side pressing plates vertically connected to the inner walls of the side beam plates and end pressing plates vertically connected to the inner walls of the end beam plates; inner frame first splicing corners are arranged at both ends of the side pressing plates, and inner frame second splicing corners are arranged at both ends of the end pressing plates. The inner frame first splicing corners and the inner frame second splicing corners are spliced with each other to form a vertical connection.

[0015] Further, the side pressing plates and the side beam plates are integrally formed, and the end pressing plates and the end beam plates are integrally formed.

[0016] Further, liquid cooling interface through holes through which the first liquid cooling interface or the second liquid cooling interface can penetrate are opened on the end pressing plates and the end beam plates.

[0017] Further, the surface of the liquid cooling plate body is not higher than the upper surface of the inner frame.

[0018] Further, the bottom plate and the bottom of the frame body are connected by FDS flow drill screws.

[0019] A battery pack box body with liquid cooling function provided by the present utility model is formed by splicing side beam plates with different lengths but the same structure and end beam plates with the same structure to form a frame that can adapt to the installation space of different specifications of battery cell modules, and an inner frame is formed inside the frame. After connecting with the bottom plate, a liquid cooling plate slot for installing the liquid cooling plate assembly is formed. This solution not only has a simple structure, and the liquid cooling plate assembly can be quickly assembled only by connecting with the liquid cooling plate slot, but also does not occupy the space of the box body and can effectively cool the battery cell modules. In addition, the spliced battery pack box body not only has a simple structure and can be quickly spliced, but also each beam plate can be freely disassembled and replaced when damaged, which can effectively extend the service life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. 6 is a schematic structural view of the first perspective of a battery pack box body with liquid cooling function according to the present utility model;

[0021] Figure 2 FIG. 10 is a schematic structural view of the second perspective of a battery pack box body with liquid cooling function according to the present utility model;

[0022] Figure 3 FIG. 14 is an exploded view of the box body in a battery pack box body with liquid cooling function according to the present utility model;

[0023] Figure 4 FIG. 18 is a cross-sectional view of the liquid cooling plate assembly in a battery pack box body with liquid cooling function according to the present utility model;

[0024] Figure 5 FIG. 22 is a schematic view of the connection between the liquid cooling plate assembly and the inner frame in a battery pack box body with liquid cooling function according to the present utility model.

[0025] REFERENCE MARKS:

[0026] 1 - Upper cover;

[0027] 2 - Box body, 201 - Frame, 202 - Bottom plate, 203 - Inner frame, 204 - Liquid cooling plate slot, 205 - Side beam plate, 206 - End beam plate, 207 - Splicing bevel, 208 - Side pressing plate, 209 - End pressing plate, 210 - First inner frame splicing angle, 211 - Second inner frame splicing angle, 212 - Liquid cooling interface through hole;

[0028] 3 - Liquid cooling plate assembly, 301 - First liquid cooling interface, 302 - Second liquid cooling interface, 303 - Liquid cooling plate body, 304 - Liquid cooling channel, 305 - Fin group, 306 - Fin, 307 - Single coolant channel;

[0029] 4 - FDS flow drill screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present utility model will be further described in detail below with reference to the drawings and embodiments. The described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0031] As Figures 1 to 3 shown, this solution provides a battery pack box body with a liquid cooling function, including a box body 2 and an upper cover 1 that can be buckled with each other. The box body 2 includes a frame body 201 and a bottom plate 202 that are connected to each other. An inner frame 203 is provided at a position on the inner wall of the frame body 201 adjacent to the bottom plate 202. The inner wall of the inner frame 203 constitutes a liquid cooling plate slot 204, and a liquid cooling plate assembly 3 is embedded in the liquid cooling plate slot 204;

[0032] The liquid cooling plate assembly 3 includes a first liquid cooling interface 301 and a second liquid cooling interface 302 provided at both ends. The first liquid cooling interface 301 and the second liquid cooling interface 302 respectively penetrate through the inner frame 203 and the frame body 201 and extend outwards for connecting with an external liquid cooling circulation device.

[0033] In this embodiment, a battery cell module installation space for installing a battery cell module is formed between the surfaces of the inner frame 203 and the liquid cooling plate assembly 3 and the inner wall of the frame body 201; and the surface of the liquid cooling plate assembly 3 is used as a preferred battery cell module installation position, and the liquid cooling plate assembly 3 can directly perform liquid cooling on the bottom of the battery cell module.

[0034] In this embodiment, the bottom plate 202 and the bottom of the frame body 201 are connected by an FDS flow drill screw 4. The FDS flow drill screw 4 can connect different materials, single-sided connection process, no waste chips are generated, no additional processing procedures are required, it can be disassembled repeatedly, and it can be used in combination with structural adhesive to improve strength

[0035] As Figure 4 shown, the liquid cooling plate assembly 3 includes a liquid cooling plate body 303 that matches the shape of the liquid cooling plate slot 204. A liquid cooling channel 304 is provided in the liquid cooling plate body 303. The liquid inlet end of the liquid cooling channel 304 is connected to the first liquid cooling interface 301, and the liquid outlet end of the liquid cooling channel 304 is connected to the second liquid cooling interface 302.

[0036] Specifically, in this structure, the cooling liquid enters the liquid cooling channel 304 from the first liquid cooling interface 301, and after filling the liquid cooling channel 304, it is output outwards from the second liquid cooling interface 302, thereby realizing the transfer of the heat of the battery cell module conducted by the liquid cooling plate body 303 outwards, and finally realizing the continuous cooling of the battery cell module.

[0037] A fin group 305 is arranged in the liquid cooling channel 304. The fin group 305 includes a number of fins 306, and a single coolant channel 307 is formed between adjacent fins 306.

[0038] Specifically, the coolant enters the liquid cooling channel 304 from the first liquid cooling interface 301 and is dispersed into each single coolant channel 307. After filling the single coolant channel 307, it is output outward from the second liquid cooling interface 302, thereby realizing the transfer of the heat of the battery cell module conducted by the liquid cooling plate body 303 to the outside, and finally realizing continuous cooling of the battery cell module.

[0039] Through the fin group 305, the coolant in the liquid cooling channel 304 can be effectively shunted, and each single coolant channel 307 is promoted to act on the liquid cooling plate body 303 alone, thereby transferring the heat of the battery cell module conducted by the liquid cooling plate body 303 to the outside.

[0040] As an optimization of the liquid cooling channel 304 in this embodiment, the liquid cooling channel 304 is S-shaped. Correspondingly, the fin group 305 is arranged in an S shape in the liquid cooling channel 304.

[0041] Through this S-shaped arrangement, the area of the coolant acting on the liquid cooling plate body 303 can be effectively promoted, thereby increasing the heat dissipation area of the liquid cooling plate assembly 3.

[0042] As Figure 3 and Figure 5 shown, in this embodiment, the frame body 201 is a rectangular frame body, including side beam plates 205 arranged symmetrically with each other, and end beam plates 206 arranged at both ends of the two side beam plates 205. The two ends of the side beam plates 205 and the end beam plates 206 are both provided with splicing chamfers 207.

[0043] In this embodiment, in order to enable any two adjacent side beam plates 205 and end beam plates 206 to be vertically connected at 90 degrees, as a preferred solution, the splicing chamfer 207 is set to 45°. After splicing with each other, it can be bonded with glue or connected with screws.

[0044] The inner frame 203 is a rectangular inner frame, including side pressing plates 208 vertically connected to the inner walls of the side beam plates 205, and end pressing plates 209 vertically connected to the inner walls of the end beam plates 206; inner frame first splicing corners 210 are arranged at both ends of the side pressing plates 208, and inner frame second splicing corners 211 are arranged at both ends of the end pressing plates 209. After the inner frame first splicing corners 210 and the inner frame second splicing corners 211 are spliced with each other, a vertical connection is formed.

[0045] As an optimization of this solution, the side pressing plate 208 and the side beam plate 205 are integrally formed, and the end pressing plate 209 and the end beam plate 206 are integrally formed. In this structure, by selecting side beam plates 205 and end beam plates 206 with different lengths, the frame body 201 of different specifications can be spliced, so as to adapt to battery cell modules of different specifications, making the production cost lower and enabling rapid splicing.

[0046] Liquid cooling interface through holes 212 through which the first liquid cooling interface 301 or the second liquid cooling interface 302 can penetrate are formed in the end pressing plate 209 and the end beam plate 206, so as to facilitate the penetration and installation of the first liquid cooling interface 301 or the second liquid cooling interface 302.

[0047] It should be noted that the surface of the liquid cooling plate body 303 is not higher than the upper surface of the inner frame 203. Furthermore, it is convenient for the penetration and installation of the first liquid cooling interface 301 and the second liquid cooling interface 302.

[0048] The above is only to illustrate the embodiments of the present invention and is not intended to limit the present invention. For those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A battery pack box with liquid cooling function, characterized in that: The invention comprises a box body (2) and an upper cover (1) which can be interlocked, the box body (2) comprising a frame body (201) and a bottom plate (202) which are connected to each other, an inner frame (203) is arranged on the inner wall of the frame body (201) adjacent to the bottom plate (202), the inner wall of the inner frame (203) forms a liquid cooling plate embedding groove (204), and a liquid cooling plate assembly (3) is embedded in the liquid cooling plate embedding groove (204); The liquid cooling plate assembly (3) comprises a first liquid cooling interface (301) and a second liquid cooling interface (302) arranged at two ends, the first liquid cooling interface (301) and the second liquid cooling interface (302) respectively passing through the inner frame (203) and the frame body (201) and then extending outwards.

2. The battery pack box with liquid cooling function according to claim 1, characterized in that: The liquid cooling plate assembly (3) comprises a liquid cooling plate body (303) whose shape matches that of the liquid cooling plate embedding groove (204); a liquid cooling channel (304) is arranged in the liquid cooling plate body (303); a liquid inlet end of the liquid cooling channel (304) is connected to the first liquid cooling interface (301); and a liquid outlet end of the liquid cooling channel (304) is connected to the second liquid cooling interface (302).

3. The battery pack box with liquid cooling function according to claim 2, characterized in that: A fin group (305) is provided in the liquid cooling channel (304), wherein the fin group (305) comprises a plurality of fins (306), and a single cooling liquid channel (307) is formed between adjacent fins (306).

4. The battery pack box with liquid cooling function according to claim 3, characterized in that: The liquid cooling channel (304) is in an S shape, and correspondingly, the fin group (305) is arranged in an S shape in the liquid cooling channel (304).

5. The battery pack box with liquid cooling function according to claim 1, characterized in that: The frame (201) is a rectangular frame, comprising side beam plates (205) symmetrically arranged with respect to each other, and end beam plates (206) arranged at both ends of the two side beam plates (205), and both ends of the side beam plates (205) and the end beam plates (206) are provided with splicing bevels (207).

6. The battery pack box with liquid cooling function according to claim 5, characterized in that: The inner frame (203) is a rectangular inner frame, comprising a side pressure plate (208) vertically connected to the inner wall of the side beam plate (205), and an end pressure plate (209) vertically connected to the inner wall of the end beam plate (206); both ends of the side pressure plate (208) are provided with a first inner frame corner (210), and both ends of the end pressure plate (209) are provided with a second inner frame corner (211); the first inner frame corner (210) and the second inner frame corner (211) are spliced ​​to each other to form a vertical connection.

7. The battery pack box with liquid cooling function according to claim 6, characterized in that: The side pressure plate (208) is integrally formed with the side beam plate (205), and the end pressure plate (209) is integrally formed with the end beam plate (206).

8. The battery pack box with liquid cooling function according to claim 7, characterized in that: The end pressure plate (209) and the end beam plate (206) are provided with a liquid cooling interface through hole (212) through which the first liquid cooling interface (301) or the second liquid cooling interface (302) can pass.

9. The battery pack box with liquid cooling function according to claim 2, characterized in that: The surface of the liquid cooling plate body (303) is not higher than the upper surface of the inner frame (203).

10. The battery pack box with liquid cooling function according to claim 1, characterized in that: The bottom plate (202) is connected to the bottom of the frame (201) via FDS flow drill screws (4).

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