Battery pack liquid cooling system and battery pack

Abstract

The utility model discloses a battery pack liquid cooling system and a battery pack, the liquid cooling system comprises a cooling liquid inlet, a cooling liquid outlet, pipelines and at least one liquid cooling plate, the pipelines comprise an inlet pipeline and an outlet pipeline, the cooling liquid inlet is connected with the inlet pipeline, and the cooling liquid outlet is connected with the outlet pipeline; a flow channel inlet is formed in one side of the liquid cooling plate, a flow channel outlet is formed in the other opposite side of the liquid cooling plate, the flow channel inlet is connected with an inlet pipeline, the flow channel outlet is connected with an outlet pipeline, a flow channel is arranged between the flow channel inlet and the flow channel outlet and comprises a plurality of circular ring grooves which are communicated with each other, and an intersection opening is formed in the communication position of every two circular ring grooves. The width of the intersection opening is larger than that of the circular ring groove. According to the utility model, by optimizing the geometrical shape and width of the liquid cooling plate flow channel of the liquid cooling system, the heat dissipation uniformity is improved, the problem that hot spots are easy to form in the battery pack is solved, the design and manufacturing processes are simplified, and the universality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery thermal management and heat dissipation, and in particular to a battery pack liquid cooling system and a battery pack. Background Art

[0002] Battery packs generate heat during use. As one of the most critical components in a battery pack, the liquid cooling system's heat dissipation is crucial to the battery's performance, safety, and cycle life. The liquid cold plate is a key component of this system. The coolant flowing through the cold plate transfers heat from the battery to the plate itself through heat conduction, and the heat is then removed through convection by the cooling medium. Therefore, a suitable cold plate structure is crucial for heat dissipation. Traditional cold plates typically employ simple straight or curved flow channels, absorbing heat through the coolant's flow. However, as electronic devices move toward higher power and smaller size, traditional cold plate designs struggle to meet the demand for efficient heat dissipation. In power electronics, in particular, heat is often concentrated in specific areas. Traditional flow channel designs, with the coolant flow rate and velocity being uniform across these areas, result in inefficient heat dissipation in these areas, leading to the formation of hot spots, which can affect device stability and lifespan. Traditional cold plates often require customized designs to accommodate the diverse heat source distributions of different devices, increasing design and manufacturing complexity. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a battery pack liquid cooling system that can solve the problem of uneven heat dissipation of existing liquid cooling plates and the need for customized design when facing the heat source distribution of different equipment.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A battery pack liquid cooling system includes a coolant inlet, a coolant outlet, a pipeline and at least one liquid cooling plate, wherein the pipeline includes an inlet pipeline and an outlet pipeline, the coolant inlet is connected to the inlet pipeline, and the coolant outlet is connected to the outlet pipeline; a flow channel inlet is provided on one side of the liquid cooling plate, and a flow channel outlet is provided on the other opposite side, the flow channel inlet is connected to the inlet pipeline, and the flow channel outlet is connected to the outlet pipeline, a flow channel is provided between the flow channel inlet and the flow channel outlet, and the flow channel includes a plurality of interconnected annular grooves, and the connection point between every two annular grooves is an intersection, and the width of the intersection is greater than the width of the annular grooves.

[0006] Preferably, several of the annular grooves are connected in sequence to make the flow channel as a whole S-shaped, and the flow channel inlet and the flow channel outlet are respectively connected to the first and last annular grooves.

[0007] Preferably, several of the annular grooves are arranged in an m*n rectangle, where m is the number of rows, n is the number of columns, m≥2, n≥2, and the intersection is formed between every two adjacent annular grooves. The flow channel inlet is directly or indirectly connected to the annular grooves in the first row, and the flow channel outlet is directly or indirectly connected to the annular grooves in the last row.

[0008] Preferably, the flow channel inlet is connected to the first annular groove in the first row, and the flow channel outlet is connected to the last annular groove in the mth row.

[0009] Preferably, the flow channel is also provided with a confluence groove, and one confluence groove is provided between the flow channel inlet and the annular groove of the first row and between the flow channel outlet and the annular groove of the mth row. The two confluence grooves are respectively connected to each annular groove of the first row and each annular groove of the mth row.

[0010] Preferably, the coolant inlet and the coolant outlet are arranged diagonally, the inlet pipe is connected to the flow channel inlet of the liquid cooling plate, the outlet pipe is connected to the flow channel outlet of the liquid cooling plate, and the flow channel inlet and the flow channel outlet are arranged diagonally.

[0011] Another technical problem to be solved by the present invention is to provide a battery pack that can solve the problem of uneven heat dissipation and easy formation of hot spots in existing battery packs.

[0012] In order to solve the above technical problems, the technical solution of the utility model is:

[0013] A battery pack comprises a shell, a battery module and the above-mentioned liquid cooling system; the shell is provided with holes adapted for a coolant inlet and a coolant outlet, and the battery module and the liquid cooling system are installed in the shell; the liquid cooling system is provided with multiple liquid cooling plates, and the battery modules are placed between two liquid cooling plates.

[0014] Preferably, the battery modules are arranged in two rows, three liquid cooling plates are arranged in parallel, and the two rows of battery modules are placed between two liquid cooling plates.

[0015] After adopting the above solution, the utility model has at least the following beneficial effects:

[0016] 1. The liquid cooling plate flow channel of the liquid cooling system provided by this utility model is equipped with multiple interconnected annular grooves. The intersection where every two annular grooves meet is wider than the width of the annular grooves. As a result, the flow channel exhibits varying widths at different locations, allowing the coolant to absorb heat at different flow rates and flow rates as it flows through different areas. This results in more uniform heat absorption and conduction, thereby improving overall heat dissipation efficiency. Furthermore, this flow channel design allows the liquid cooling plate to be modularized, simplifying the design and manufacturing process and enhancing versatility.

[0017] 2. The liquid cooling plate flow channel of the liquid cooling system provided by the present invention can effectively balance the flow rate and resistance by optimizing the geometry and width of the flow channel, thereby achieving reasonable control of heat and maximizing heat dissipation efficiency.

[0018] 3. The battery pack provided by the present invention significantly improves heat dissipation performance and reduces the formation of hot spots by adopting the above-mentioned liquid cooling system, making the battery pack more stable and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the liquid cooling system provided in Example 1 of the present utility model;

[0020] Figure 2 This is a schematic diagram of the internal flow channel of the liquid cooling plate provided in the first embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the overall structure of the battery pack provided in Example 1 of the present utility model;

[0022] Figure 4 This is a schematic diagram of the internal structure of the battery pack provided in Example 1 of the present utility model;

[0023] Figure 5 This is a schematic diagram of the internal flow channel of the liquid cooling plate provided in the second embodiment of the present invention.

[0024] In the figure: 1-cooling liquid inlet, 2-cooling liquid outlet, 3-pipeline, 31-inlet pipe, 32-outlet pipe, 4-liquid cooling plate, 41-flow channel inlet, 42-flow channel outlet, 43-flow channel, 431-annular groove, 432-intersection, 433-confluence groove; 5-shell, 51-box, 52-upper cover, 6-battery module. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Example 1

[0027] like Figure 1-2 As shown, this embodiment provides a battery pack liquid cooling system installed in a battery pack to cool the battery modules 6 therein. The liquid cooling system includes a coolant inlet 1, a coolant outlet 2, a pipeline 3, and at least one liquid cooling plate 4. The pipeline 3 includes an inlet pipeline 31 and an outlet pipeline 32. The coolant inlet 1 is connected to the inlet pipeline 31, the coolant outlet 2 is connected to the outlet pipeline 32, and the liquid cooling plate 4 is connected to the inlet pipeline 31 and the outlet pipeline 32.

[0028] The liquid cooling plate 4 has a flow channel inlet 41 on one side and a flow channel outlet 42 on the opposite side. The flow channel inlet 41 is connected to the inlet pipe 31, and the flow channel outlet 42 is connected to the outlet pipe 32. A flow channel 43 is provided between the flow channel inlet 41 and the flow channel outlet 42. The flow channel 43 can be formed by a plurality of interconnected annular grooves 431. The connection point between each two annular grooves 431 forms an intersection 432, and the width of the intersection 432 is greater than the width of the annular grooves 431. The coolant enters the flow channel inlet 41 and flows from one annular groove 431 to the next annular groove 431 through the intersection 432, and so on until it flows out of the flow channel outlet 42. When the coolant flows through the annular grooves 431, the width is small and the flow rate is fast, which is conducive to quickly removing heat and improving heat dissipation efficiency. When the coolant flows through the intersection 432, the width becomes larger, the flow rate is large, and the coolant stays for a long time, which can fully absorb heat. During this process, the annular groove 431 and the intersection 432 cooperate with each other, and the flow channel 43 achieves variable width at different positions. This design can optimize the flow rate and pressure distribution, so that the coolant can absorb and conduct heat more evenly, thereby improving the heat dissipation uniformity of the liquid cooling plate 4. At the same time, this flow channel design enables the liquid cooling plate 4 to adapt to the thermal management requirements of various devices, increases the flexibility and universality of application, and reduces design and manufacturing costs.

[0029] Further, if Figure 2 As shown, the arrangement of the annular grooves 431 in this embodiment is as follows: a number of the annular grooves 431 are connected in sequence to form an S-shaped flow channel, and the flow channel inlet 41 and the flow channel outlet 42 are respectively connected to the first and last annular grooves 431. The coolant has a slow flow rate in a wider flow channel and a smaller flow resistance, while it has a fast flow rate in a narrower flow channel and a correspondingly larger flow resistance. Therefore, through appropriate width and geometric optimization design, the flow rate and resistance can be effectively balanced to achieve reasonable heat control and maximize heat dissipation efficiency. In this embodiment, the shape of the ring itself is conducive to reducing flow resistance. Secondly, the ratio of the inner and outer diameters of the annular groove is 7:20. The ratio of the width of the two intersections 432 at each bend of the S-shaped flow channel to the width of the annular groove 431 is 7.87:6.5, and the ratio of the width of the remaining intersections 432 to the width of the annular groove 431 is 12:6.5.

[0030] Furthermore, the number of the liquid cooling plates 4 can be set accordingly according to the number of battery modules in the battery pack. The liquid cooling plates 4 are mainly arranged on both sides of the battery modules. The design of the side liquid cooling plates is conducive to maintaining the compactness of the overall system and can effectively utilize space, especially in devices with limited height or thickness. At the same time, it ensures that heat is more evenly conducted from the sides of the heat dissipation device, which helps to avoid temperature difference problems caused by top or bottom cooling. It can also synergize with natural convection to help heat dissipate upward, thereby increasing heat dissipation efficiency. Depending on the situation, it can also be set on other side edges or top and bottom surfaces. The liquid cooling plate 4 with annular grooves is designed as a modular unit to facilitate expansion or replacement. This modular design helps to reduce production costs and can flexibly adapt to different battery module specifications or other cooling requirements.

[0031] Furthermore, the coolant inlet 1 and the coolant outlet 2 may be arranged diagonally, and the flow channel inlet 41 and the flow channel outlet 42 may also be arranged diagonally to ensure the effectiveness and uniformity of the coolant flow.

[0032] like Figure 3-4 As shown, this embodiment also provides a battery pack, including a shell 5, a battery module 6 and the above-mentioned liquid cooling system.

[0033] The shell 5 can be composed of a box body 51 and an upper cover 52. The box body 51 is provided with holes adapted to the coolant inlet 1 and the coolant outlet 2. The coolant inlet 1 can be set above the box body 51, and the coolant outlet 2 can be set below the box body 51.

[0034] The battery modules and liquid cooling system are installed within a housing 5. Two rows of battery modules 6 can be provided, with three groups of battery modules 6 in each row. Each group of battery modules 6 can be composed of six battery cells connected in series. Three liquid cooling plates 4 can be arranged in parallel, with the two rows of battery modules 6 placed between each pair of liquid cooling plates 4.

[0035] In this embodiment, coolant enters through the coolant inlet 1 above the housing 51, is distributed to each liquid cooling plate 4 through the inlet pipe 31, and then flows into the flow channel inlet 41 above the liquid cooling plate 4. It flows through multiple annular grooves 431 to form an S-shaped flow channel 43, during which it effectively exchanges heat with the battery module 6. It then flows out of the flow channel outlet 42 below the liquid cooling plate 4 and enters the outlet pipe 32, and finally flows out of the coolant outlet 2 below the housing 51, completing the heat dissipation process of the battery pack. By adopting the above-mentioned liquid cooling system, the battery pack of this embodiment significantly improves heat dissipation performance, reduces the formation of hot spots, and makes the battery pack more stable and extends its service life.

[0036] Example 2

[0037] This embodiment provides a battery pack liquid cooling system, which is installed in the battery pack to cool the battery modules 6 in the battery pack. Figure 5 As shown, the difference between this embodiment and the first embodiment is that in this embodiment, the plurality of annular grooves 431 are arranged in an m*n rectangular arrangement, where m is the number of rows and n is the number of columns, and m≥2 and n≥2. The intersection 432 is formed between every two adjacent annular grooves 431. The flow channel inlet 41 can communicate with the first annular groove 431 in the first row, and the flow channel outlet 42 can communicate with the last annular groove 431 in the mth row. The coolant enters the flow channel inlet 41, flows through each annular groove 431 and the intersection 432, and then flows out of the flow channel inlet 42.

[0038] Furthermore, the flow channel 43 is also provided with a confluence groove 433, and a confluence groove 433 can be provided between the flow channel inlet 41 and the first row of annular grooves 431 and between the flow channel outlet 42 and the mth row of annular grooves 431. The two confluence grooves 433 are respectively connected to each annular groove 431 in the first row and each annular groove 431 in the mth row. Figure 5 As shown, 4*10 annular grooves 431 are arranged in a rectangular shape. The coolant flows from the flow channel inlet 41 into the upper confluence groove 433, flows from the confluence groove 433 into the annular grooves 431 in the first row, then flows through the middle annular grooves 431 and the intersection 432, and then flows from the annular grooves 431 in the last row (mth row) into the confluence groove 433 below, and finally flows out from the flow channel inlet 42.

[0039] Furthermore, in this embodiment, the ratio of the inner and outer diameters of the annular groove is 9.5:17.5, and the ratio of the width of the intersection 432 to the width of the annular groove 431 is 8.12:4.

[0040] The rest of the structure of the liquid cooling system in this embodiment is the same as that in the first embodiment and will not be described again here.

[0041] This embodiment further provides a battery pack, comprising a housing 5, a battery module 6, and the aforementioned liquid cooling system. The remaining structure of the battery pack is the same as that of the first embodiment and will not be described in detail here.

[0042] In this embodiment, coolant enters through the coolant inlet 1 above the housing 51, is distributed to each liquid cooling plate 4 through the inlet pipe 31, and then flows into the flow channel inlet 41 above the liquid cooling plate 4. It flows through the flow channel 43 formed by the upper and lower confluence grooves 433 and the circular grooves 431 arranged in an m*n rectangular pattern in the middle. During this process, it effectively exchanges heat with the battery module 6. It then flows out of the flow channel outlet 42 below the liquid cooling plate 4 and enters the outlet pipe 32. Finally, it flows out of the coolant outlet 2 below the housing 51, completing the heat dissipation process of the battery pack. By adopting the above-mentioned liquid cooling system, the battery pack of this embodiment significantly improves the heat dissipation performance, reduces the formation of hot spots, and makes the battery pack more stable and extends its service life.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any changes or modifications made according to the claims and description of the present invention should fall within the scope of the present invention patent.

Claims

1. A battery pack liquid cooling system, characterized by: It includes a coolant inlet, a coolant outlet, a pipeline and at least one liquid cooling plate, the pipeline includes an inlet pipeline and an outlet pipeline, the coolant inlet is connected to the inlet pipeline, and the coolant outlet is connected to the outlet pipeline; a flow channel inlet is provided on one side of the liquid cooling plate, and a flow channel outlet is provided on the other side opposite thereto, the flow channel inlet is connected to the inlet pipeline, and the flow channel outlet is connected to the outlet pipeline, a flow channel is provided between the flow channel inlet and the flow channel outlet, and the flow channel includes a plurality of interconnected annular grooves, and the connection point between every two annular grooves is an intersection, and the width of the intersection is greater than the width of the annular grooves.

2. The battery pack liquid cooling system according to claim 1, characterized in that: The plurality of annular grooves are connected in sequence to form an S-shaped flow channel as a whole, and the flow channel inlet and the flow channel outlet are respectively connected to the first and last annular grooves.

3. The battery pack liquid cooling system according to claim 1, characterized in that: Several of the annular grooves are arranged in an m*n rectangle, where m is the number of rows and n is the number of columns, m≥2, n≥2, and an intersection is formed between every two adjacent annular grooves. The flow channel inlet is directly or indirectly connected to the annular grooves in the first row, and the flow channel outlet is directly or indirectly connected to the annular grooves in the last row.

4. The battery pack liquid cooling system according to claim 3, characterized in that: The flow channel inlet is communicated with the first annular groove in the first row, and the flow channel outlet is communicated with the last annular groove in the mth row.

5. The battery pack liquid cooling system according to claim 3, characterized in that: The flow channel is also provided with a confluence groove, and one confluence groove is provided between the flow channel inlet and the first row of annular grooves and between the flow channel outlet and the mth row of annular grooves. The two confluence grooves are respectively connected to each annular groove in the first row and each annular groove in the mth row.

6. The battery pack liquid cooling system according to claim 1, characterized in that: The coolant inlet and the coolant outlet are arranged diagonally, and the flow channel inlet and the flow channel outlet are arranged diagonally.

7. A battery pack, characterized in that: It comprises a shell, a battery module and a liquid cooling system according to any one of claims 1 to 6; the shell is provided with holes adapted for a coolant inlet and a coolant outlet, and the battery module and the liquid cooling system are installed in the shell; the liquid cooling system is provided with a plurality of liquid cooling plates, and the battery module is placed between two liquid cooling plates.

8. The battery pack according to claim 7, characterized in that: The battery modules are arranged in two rows, and three liquid cooling plates are arranged in parallel, and the two rows of battery modules are placed between two liquid cooling plates.

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