Lithium battery cooling device

Abstract

The utility model provides a lithium battery cooling device, and relates to the technical field of cooling devices, the lithium battery cooling device comprises a battery box, a battery pack and a cooling structure, the battery pack is arranged in the battery box; the cooling structure is arranged above the battery pack and is fixedly connected with the battery box; wherein a liquid inlet pipe and a liquid outlet pipe are arranged on one side of the battery box, a water inlet pipe and a water outlet pipe are arranged on the side, away from the liquid inlet pipe, of the battery box, the cooling structure comprises a cooling fin set and a pipeline, one end of the pipeline is fixedly connected with the water inlet pipe, and the other end of the pipeline is fixedly connected with the water outlet pipe. The end, away from the water inlet pipe, of the pipeline penetrates through the cooling fin set to be fixedly connected with the water outlet pipe. According to the lithium battery cooling device, efficient heat dissipation and temperature uniformity control can be achieved, the cooling requirement is met, the cooling effect is improved, and meanwhile the safety in the lithium battery cooling process can be improved.

Description

Technical Field

[0001] This utility model relates to the field of cooling device technology, specifically to a lithium battery cooling device. Background Technology

[0002] With the global energy crisis and increasing environmental awareness, electric vehicles, powered by lithium-ion battery systems, are gradually replacing traditional gasoline-powered vehicles and becoming the future trend in transportation. Lithium-ion batteries, with their significant advantages such as low self-discharge rate, long cycle life, and high energy density, dominate the power system of electric vehicles.

[0003] In actual operation, existing batteries experience a rapid increase in internal temperature due to the inability to dissipate heat generated by ohmic resistance and chemical reactions. This leads to a significant temperature difference within the battery module. This thermal effect not only accelerates the performance degradation of lithium-ion batteries but can also trigger thermal runaway, posing a serious threat to vehicle safety. Therefore, electric vehicles face increasingly stringent requirements for battery system thermal safety under different service environments, making efficient and reliable battery thermal management systems a key technology for ensuring both battery performance and vehicle safety.

[0004] However, the battery thermal management systems widely used in the electric vehicle field currently fall into three main categories: forced air cooling, phase change material cooling, and indirect liquid cooling. Forced air cooling is limited by the poor thermal conductivity of air, resulting in insufficient heat dissipation and cooling capacity under high load and high temperature environments, making it difficult to ensure battery temperature uniformity. While phase change material cooling can achieve temperature control without additional energy consumption through phase change heat absorption, the material fails after melting and poses safety hazards such as leakage and flammability, affecting the long-term reliability of the system. Although indirect liquid cooling has higher heat dissipation efficiency, the multi-layer interface contact thermal resistance leads to a decrease in heat transfer efficiency, and the risk of coolant leakage may cause battery short circuits or corrosion. Utility Model Content

[0005] Therefore, in order to solve the problems of poor cooling effect of existing lithium battery cooling systems, which cannot meet the cooling requirements and pose significant safety hazards, the purpose of this utility model is to provide a lithium battery cooling device, the specific technical solution of which is as follows:

[0006] A lithium battery cooling device includes a battery box, a battery pack, and a cooling structure. The battery pack is disposed inside the battery box. The cooling structure is disposed above the battery pack and fixedly connected to the battery box. An inlet pipe and an outlet pipe are provided on one side of the battery box, and a water inlet pipe and a water outlet pipe are provided on the side of the battery box away from the inlet pipe. The cooling structure includes a heat dissipation fin assembly and a pipe. One end of the pipe is fixedly connected to the water inlet pipe, and the end of the pipe away from the water inlet pipe passes through the heat dissipation fin assembly and is fixedly connected to the water outlet pipe.

[0007] Furthermore, the bottom of the battery box is provided with several receiving slots, which are evenly spaced, and one end of the battery pack is inserted into the corresponding receiving slot.

[0008] Furthermore, a retainer is connected to the end of the battery pack away from the receiving slot, and the retainer is snapped into the battery pack.

[0009] Furthermore, it includes a top cover, which is disposed on top of the battery box and detachably connected to the battery box.

[0010] Furthermore, a groove is provided on the side of the top cover near the battery box, and a sealing gasket is provided on the groove.

[0011] Furthermore, the heat dissipation fin assembly includes several fins, each fin is evenly spaced, and each fin has a concave-convex structure.

[0012] Furthermore, the pipe is configured as a copper pipe, and the pipe bends in an S-shape through the heat dissipation fin assembly.

[0013] Furthermore, both the inlet pipe and the outlet pipe can be detachably equipped with a first sealing plug.

[0014] Furthermore, a positive wire channel and a negative wire channel are provided on one side of the battery box, and a second sealing plug can be detachably installed on both the positive wire channel and the negative wire channel.

[0015] Furthermore, a temperature sensor and a pressure sensor are installed in the inlet pipe, or a temperature sensor and a pressure sensor are installed in the outlet pipe.

[0016] Compared to existing technologies, the advantages of this invention are as follows: By incorporating a battery box, the internal battery pack is protected from mechanical impact or vibration; by implementing a cooling structure, heat dissipation is improved. This cooling structure includes heat dissipation fins and pipes. The low thermal resistance of the heat dissipation fins, combined with the continuous cooling supply of coolant within the pipes, allows for rapid response to changes in battery heat load, preventing localized overheating. The tight fit between the heat dissipation fins and pipes ensures rapid condensation of vapor upon contact with the fins, reducing condensation time and improving overall heat dissipation efficiency. This lithium battery cooling device achieves efficient heat dissipation and temperature uniformity control, meeting cooling requirements and enhancing safety during the lithium battery cooling process. Attached Figure Description

[0017] The present invention can be further understood from the following description in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale, but the focus is on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0018] Figure 1 This is a schematic diagram of the structure of a lithium battery cooling device according to an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A magnified structural diagram of A in the middle;

[0020] Figure 3 This is a top view of a lithium battery cooling device according to an embodiment of the present invention;

[0021] Figure 4 This is a cross-sectional view of a lithium battery cooling device according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the cooling structure according to an embodiment of the present invention;

[0023] Figure 6 This is a partial connection structure diagram of the fixture, battery pack, and battery box according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the top cover according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Battery box; 11. Inlet pipe; 12. Outlet pipe; 13. Water inlet pipe; 14. Water outlet pipe; 15. Receiving tank; 16. Positive terminal channel for electrical wires; 17. Negative terminal channel for electrical wires; 18. First sealing plug; 19. Second sealing plug; 2. Battery pack; 3. Cooling structure; 31. Heat dissipation fin assembly; 311. Fins; 32. Pipe; 4. Fixing device; 5. Top cover; 51. Groove; 52. Sealing gasket; 6. Nickel sheet. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and do not limit the scope of protection of this utility model.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0029] 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 invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] In this utility model, "first" and "second" do not represent a specific quantity or order, but are merely used to distinguish names.

[0031] like Figures 1-7 As shown, a lithium battery cooling device according to one embodiment of the present invention includes a battery box 1, a battery pack 2, and a cooling structure 3. The battery pack 2 is disposed inside the battery box 1. The cooling structure 3 is disposed above the battery pack 2 and fixedly connected to the battery box 1 to ensure that the vapor generated by the liquid in the battery box 1 due to overheating rises to the cooling structure 3. The battery box 1 is provided with an inlet pipe 11 and an outlet pipe 12 on one side, and an inlet pipe 13 and an outlet pipe 14 on the side of the battery box 1 away from the inlet pipe 11. The cooling structure 3 includes a heat dissipation fin assembly 31 and a pipe 32. One end of the pipe 32 is fixedly connected to the inlet pipe 13, and the end of the pipe 32 away from the inlet pipe 13 passes through the heat dissipation fin assembly 31 and is fixedly connected to the outlet pipe 14. By setting up the battery box 1, the internal battery pack 2 is protected from mechanical impact or vibration. The cooling structure 3 improves heat dissipation. The cooling structure 3 includes a heat dissipation fin assembly 31 and pipes 32. The low thermal resistance of the heat dissipation fin assembly 31, combined with the continuous cooling supply of coolant in the pipes 32, allows for rapid response to changes in battery heat load, preventing localized overheating. The tight fit between the heat dissipation fin assembly 31 and the pipes 32 ensures that steam condenses rapidly upon contact with the heat dissipation fin assembly 31, reducing condensation time and improving overall heat dissipation efficiency. In this embodiment, fluorinated liquid is introduced into the battery box 1 via the inlet pipe 11. The inlet pipe 11 and the outlet pipe 12 are connected to an external circulation pump to complete circulation. Coolant is introduced into the pipes 32 via the water inlet pipe 13. The coolant is discharged from the outlet pipe 12. The water inlet pipe 13 and the outlet pipe 14 are connected to an external peristaltic pump to complete circulation. The coolant is cooled by constant-temperature chilled water. Because the battery generates a large amount of heat during operation, the fluorinated liquid undergoes a phase change to produce vapor. The vapor rises and contacts the heat dissipation fin assembly 31. The constant-temperature chilled water flowing through pipe 32 keeps the heat dissipation fins 311 at a low temperature. Utilizing the rapid cooling capacity of the heat dissipation fins 311, a rapid response to changes in heat load is achieved, causing the vapor to condense back into a liquid state and fall down. In this embodiment, the battery pack 2 includes several lithium batteries. Adjacent lithium batteries are placed with opposite polarities and connected by nickel plates 6. For details, please refer to [link to relevant documentation]. Figure 6 It shows the structure of adjacent lithium batteries connected.

[0032] As a preferred embodiment of this utility model, it may also have the following additional technical features: a plurality of receiving slots 15 are provided at the bottom of the battery box 1, and each receiving slot 15 is evenly and equidistantly arranged. One end of the battery pack 2 is inserted into the corresponding receiving slot 15. The shape of the receiving slot 15 matches the shape of the battery pack 2, which is used to fix the lithium battery and realize quick installation and positioning.

[0033] As a preferred embodiment of the present invention, it may also have the following additional technical features: a retainer 4 is connected to one end of the battery pack 2 away from the receiving groove 15, the retainer 4 is snapped into the battery pack 2, and the battery pack 2 is fixed from the bottom and top respectively by the receiving groove 15 and the retainer 4, effectively suppressing vibration and impact.

[0034] As a preferred embodiment of this utility model, it may also have the following additional technical features: including a top cover 5, which is disposed on the top of the battery box 1 and detachably connected to the battery box 1, serving as a protective layer to reduce external impacts on the battery pack 2, effectively preventing external moisture, dust or impurities from entering the battery box 1, avoiding contamination or damage to the battery pack 2 and cooling structure 3, and improving the overall reliability and safety; at the same time, it also ensures that the fluorinated liquid circulation process in the battery box 1 proceeds normally.

[0035] As a preferred embodiment of this utility model, it may also have the following additional technical features: a groove 51 is provided on the side of the top cover 5 near the battery box 1, and a sealing gasket 52 is provided on the groove 51. The sealing gasket 52 fills the tiny gap between the top cover 5 and the battery box 1 to prevent liquid or gas leakage, ensure that the fluorinated liquid will not leak from the battery box 1, and at the same time prevent external moisture, dust or impurities from entering the battery box 1, thereby improving the reliability and safety of the system.

[0036] As a preferred embodiment of this utility model, it may also have the following additional technical features: the heat dissipation fin assembly 31 includes a plurality of fins 311, each fin 311 being evenly and equidistantly arranged to form a regular array structure. Each fin 311 is provided with a concave-convex structure to increase the effective heat dissipation area of ​​the fin 311. At the same time, the concave-convex structure can guide airflow along the surface of the fin 311, reducing turbulence and backflow, and lowering flow resistance. Specifically, in this embodiment, the concave-convex structure can be selected to be wavy, increasing the roughness of the fin 311 surface and significantly improving the actual heat dissipation area.

[0037] As a preferred embodiment of the present invention, it may also have the following additional technical features: the pipe 32 is set as a copper pipe, the pipe 32 bends in an S-shape through the heat dissipation fin assembly 31, increasing the contact area with the fins 311, extending the heat exchange path, and enhancing the heat dissipation performance. The S-shaped pipe 32 makes the copper pipe and the fin assembly 311 form multiple contact points, significantly improving the heat exchange area.

[0038] As a preferred embodiment of this utility model, it may also have the following additional technical features: First sealing plugs 18 are detachably provided on both the inlet pipe 11 and the outlet pipe 12, and are tightened and sealed by threads. To adapt to various thermal management modes, the inlet pipe 11 and the outlet pipe 12 can be tightened and sealed by the first sealing plugs 18, achieving different thermal management requirements for lithium batteries in dynamic and static modes. When the entire system needs to be in static heat dissipation without an external circulation system, the airtightness of the entire casing is ensured.

[0039] As a preferred embodiment of this utility model, it may also have the following additional technical features: a positive electrode channel 16 and a negative electrode channel 17 are provided on one side of the battery box 1, which are used to pass through the positive electrode wire and the negative electrode wire, respectively. The positive electrode wire is connected to the positive electrode of one of the lithium batteries in the battery pack 2, and the negative electrode wire is connected to the negative electrode of the other lithium battery. Through a reasonable connection method, each lithium battery can generate electricity. A second sealing plug 19 can be detachably provided on both the positive electrode channel 16 and the negative electrode channel 17. The positive electrode wire and the negative electrode wire pass through the second sealing plug 19, respectively, which ensures the sealing performance and prevents external dust from entering the battery box 1, thus avoiding dust accumulation that may cause electrical failure.

[0040] As a preferred embodiment of this utility model, it may also have the following additional technical features: a temperature sensor and a pressure sensor are installed in the inlet pipe 11. The temperature sensor in the inlet pipe 11 monitors the temperature of the coolant entering the battery box 1 to ensure that the input temperature meets the design requirements. The pressure sensor in the inlet pipe 11 monitors the inlet pressure to prevent excessive pressure from causing the pipe 32 to rupture or leak. The temperature sensor and pressure sensor adopt existing technology and will not be described in detail here. In addition, in other embodiments, a temperature sensor and a pressure sensor are installed in the outlet pipe 12. The temperature sensor in the outlet pipe 12 monitors the temperature of the coolant flowing out of the battery box 1 to evaluate the thermal management efficiency. The pressure sensor in the outlet pipe 12 monitors the outlet pressure to evaluate the system circulation resistance or detect the risk of blockage.

[0041] Specifically, in this embodiment, there are two modes: a static mode and a dynamic mode. The static mode relies on natural phase change circulation, requiring no external circulation pump. After the fluorinated liquid is introduced, the inlet pipe 11 and the outlet pipe 12 are sealed using the first sealing plug 18, which is suitable for normal operating conditions. The dynamic mode removes the first sealing plug 18 and uses an external circulation pump connected to the inlet pipe 11 and the outlet pipe 12 to control the flow of the fluorinated liquid, thereby enhancing the heat dissipation capacity under high loads.

[0042] The lithium battery cooling device in this embodiment has a reasonable structural design and is easy to use. This structure can also be used for other devices with similar usage requirements. In this embodiment, the lithium battery cooling device can achieve efficient heat dissipation and temperature uniformity control, meet cooling requirements, improve cooling effect, and increase safety during the lithium battery cooling process.

[0043] In the description of the above embodiments, greater than, less than, and more than are understood to exclude the number itself, several and more mean one or more, and above, below, and within are understood to include the number itself. If the first and second are described, they are only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-described embodiments are merely examples of several implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A lithium battery cooling device, characterized in that, include: Battery box (1); Battery pack (2), the battery pack (2) is disposed inside the battery box (1); A cooling structure (3) is disposed above the battery pack (2) and fixedly connected to the battery box (1); The battery box (1) is provided with an inlet pipe (11) and an outlet pipe (12) on one side. The battery box (1) is provided with a water inlet pipe (13) and an outlet pipe (14) on the side away from the inlet pipe (11). The cooling structure (3) includes a heat dissipation fin assembly (31) and a pipe (32). One end of the pipe (32) is fixedly connected to the water inlet pipe (13). The end of the pipe (32) away from the water inlet pipe (13) passes through the heat dissipation fin assembly (31) and is fixedly connected to the outlet pipe (14).

2. The lithium battery cooling device according to claim 1, characterized in that, The bottom of the battery box (1) is provided with several receiving slots (15), and each receiving slot (15) is evenly spaced. One end of the battery pack (2) is inserted into the corresponding receiving slot (15).

3. The lithium battery cooling device according to claim 2, characterized in that, The battery pack (2) is connected to a retainer (4) at the end away from the receiving slot (15), and the retainer (4) is engaged with the battery pack (2).

4. The lithium battery cooling device according to claim 1, characterized in that, Includes a top cover (5), which is disposed on the top of the battery box (1) and detachably connected to the battery box (1).

5. The lithium battery cooling device according to claim 4, characterized in that, The top cover (5) has a groove (51) on the side near the battery box (1), and a sealing gasket (52) is provided on the groove (51).

6. The lithium battery cooling device according to claim 1, characterized in that, The heat dissipation fin assembly (31) includes a plurality of fins (311), each fin (311) is evenly spaced, and each fin (311) has a concave-convex structure.

7. The lithium battery cooling device according to claim 1, characterized in that, The pipe (32) is made of copper and is S-shaped, passing through the heat dissipation fin assembly (31).

8. The lithium battery cooling device according to claim 1, characterized in that, Both the inlet pipe (11) and the outlet pipe (12) are detachably equipped with a first sealing plug (18).

9. The lithium battery cooling device according to claim 1, characterized in that, The battery box (1) is provided with a positive wire channel (16) and a negative wire channel (17) on one side, and a second sealing plug (19) can be detachably provided on both the positive wire channel (16) and the negative wire channel (17).

10. The lithium battery cooling device according to any one of claims 1-9, characterized in that, A temperature sensor and a pressure sensor are installed in the inlet pipe (11), or a temperature sensor and a pressure sensor are installed in the outlet pipe (12).

Images