Phase-change uniform-temperature battery heat exchange plate

Abstract

The utility model belongs to the technical field of refrigerant two-phase-change heat dissipation integration, and particularly relates to a phase-change uniform-temperature battery heat exchange plate which comprises a cold plate upper cover plate and a cold plate lower cover plate, the flow channel plate is fixedly arranged at the bottom of the cold plate upper cover plate, the two refrigerant phase change circulation channels are symmetrically arranged on the flow channel plate in the length direction of the cold plate upper cover plate, and the flow channel plate is provided with a cooling liquid channel which is located on the same horizontal plane with the refrigerant phase change circulation channels. Every two cooling liquid passages are arranged around one refrigerant phase change circulation passage; and the liquid absorption core is mounted on the refrigerant phase change circulation passage and is used for circulating gas-liquid two-phase change of a refrigerant. According to the utility model, the problems of local overheating of the battery module and on-way temperature rise of cooling liquid during liquid cooling heat dissipation are effectively prevented, the problems of non-uniform refrigerant flow distribution and large temperature difference when a new energy automobile power battery is directly cooled by adopting a refrigerant are effectively solved, the power battery is ensured to work within a proper temperature range, and the use of people is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of integrated heat dissipation technology for two-phase change refrigerant, and in particular to a phase change uniform temperature battery heat exchange plate. Background Technology

[0002] With the rapid development of new energy vehicles and the continuous increase in market penetration, the increase in battery capacity and the shortening of charging time have led to an increase in battery heat generation, which directly affects battery life and safety. Batteries generate a large amount of heat during operation, and if this heat is not dissipated in time, it may lead to thermal runaway or even fire. Therefore, efficient heat dissipation technology has become crucial for the development of new energy vehicles.

[0003] Battery heat exchange plates play multiple roles in battery thermal management systems, including temperature control, heat dissipation efficiency, heating function, heat recovery, system compactness, ease of maintenance and cleaning, and strong adaptability.

[0004] 1. Temperature control: The heat exchange plate helps maintain the battery within its optimal operating temperature range through efficient heat exchange, ensuring battery performance, extending battery life, and preventing damage caused by overheating.

[0005] 2. Heat dissipation efficiency: When the battery pack generates a lot of heat, the heat exchange plate can quickly transfer the heat to the coolant, achieving effective heat dissipation and preventing problems such as excessive battery temperature and thermal runaway.

[0006] 3. Heating function: In low-temperature environments, the heat exchange plate can be used to heat the battery by circulating a heating medium (such as a heating fluid) to increase the battery temperature and ensure the battery's performance and safety under low-temperature conditions.

[0007] 4. Heat recovery: In some thermal management systems, heat exchange plates can recover the heat generated by the battery and use it as a heat source for other systems (such as the vehicle's heating system), thereby improving the overall vehicle energy efficiency.

[0008] 5. System Compactness: The heat exchanger has a compact structure and a small footprint, making it suitable for space-constrained battery systems. At the same time, its lightweight design helps reduce the overall vehicle weight and improve the energy efficiency of new energy vehicles.

[0009] 6. Easy to maintain and clean: The heat exchange plates are easy to disassemble and clean, which helps to maintain the long-term stable operation of the system and its rapid heat exchange performance.

[0010] 7. High adaptability: The heat exchange plate can flexibly adjust the flow and heat exchange area according to different process requirements and working conditions to adapt to different battery thermal management needs.

[0011] Currently, the mainstream thermal management methods used in power batteries generally rely on coolant (a mixture of water and ethylene glycol) or simple refrigerant as the heat exchange medium. These media circulate through closed channels made of aluminum plates to achieve heat transfer and management. However, the heat exchange efficiency of coolant is about 50% lower than that of direct refrigerant cooling, and coolant also experiences temperature rise along the flow path, further reducing its heat exchange performance. On the other hand, although direct refrigerant cooling has advantages in heat exchange efficiency, the multiphase nature of the refrigerant makes its physical properties difficult to control precisely. This can lead to excessive temperature differences within the cold plate, and the voltage drop of the entire system may also become excessive. These problems can cause the battery to become overcooled or overheated, thus seriously affecting the battery's lifespan and performance.

[0012] In summary, current power battery thermal management methods still have certain shortcomings in terms of heat exchange efficiency and temperature control. To overcome these shortcomings, a phase change homogeneous temperature battery heat exchange plate is proposed to improve the heat exchange efficiency of power batteries and extend their service life. Utility Model Content

[0013] The purpose of this invention is to solve the problems of local overheating of battery modules and temperature rise of coolant along the flow path during liquid cooling, as well as the shortcomings of uneven coolant flow distribution and large temperature difference when using refrigerant for direct cooling of power batteries in new energy vehicles. Therefore, a phase change uniform temperature battery heat exchange plate is proposed.

[0014] To achieve the above objectives, the present invention adopts the following technical solution:

[0015] A phase change homogeneous temperature battery heat exchange plate, comprising:

[0016] Cold plate top plate;

[0017] A flow channel plate is fixed to the bottom of the top cover of the cold plate. Two refrigerant phase change circulation paths are symmetrically arranged on the flow channel plate along the length of the top cover of the cold plate. A coolant passage is provided on the flow channel plate at the same horizontal plane as the refrigerant phase change circulation path. Each pair of coolant passages surrounds one of the refrigerant phase change circulation paths and a liquid suction core is installed in the refrigerant phase change circulation path to facilitate the flow of refrigerant gas-liquid two-phase change.

[0018] Furthermore, one end of each of the two refrigerant phase change circulation paths is fixed with a U-shaped tube that is bent and has flat ends.

[0019] Furthermore, a valve seat and a filling valve mounted on the valve seat are fixed on the U-shaped tube.

[0020] Furthermore, the two refrigerant phase change circulation paths are respectively provided with a coolant inlet and a coolant outlet at one end near the U-shaped tube.

[0021] Furthermore, the liquid-absorbing core is made of steel wire mesh and laser-etched plate, which facilitates the flow and circulation of the refrigerant to achieve a uniform temperature effect.

[0022] Compared with the prior art, the advantages of this utility model are:

[0023] 1. The integrated two-phase variable temperature battery heat exchange plate structure of this solution includes a coolant passage and a refrigerant passage, with each pair of coolant passages surrounding a refrigerant passage to achieve heat dissipation and temperature uniformity.

[0024] 2. The cold plate in this design contains two cavities, left and right, which are connected by pipes and welded filling valves to form a passage for filling with refrigerant. The structure is simplified and the temperature uniformity is significantly improved.

[0025] 3. In this design, the liquid suction core is made of steel wire mesh and laser-etched plate, which act as the liquid suction core. The refrigerant gas and liquid phases change and flow to achieve a uniform temperature effect. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a phase change uniform temperature battery heat exchange plate proposed in this utility model;

[0028] Figure 2 This is a schematic diagram of the bottom structure of a phase change uniform temperature battery heat exchange plate proposed in this utility model.

[0029] Figure 3 This is a cross-sectional view of a phase change uniform temperature battery heat exchange plate proposed in this utility model.

[0030] The correspondence between the numbers in the attached diagram is as follows:

[0031] 1. Cold plate cover plate; 2. Coolant inlet; 201. Coolant outlet; 3. Filling valve; 4. U-tube; 5. Suction core; 501. Refrigerant phase change circulation path; 502. Coolant passage; 6. Flow channel plate. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Reference Figures 1-3 A phase change homogeneous temperature battery heat exchange plate, comprising:

[0034] Cold plate cover plate 1;

[0035] The flow channel plate 6 is fixed to the bottom of the upper cover plate 1 of the cold plate. Two refrigerant phase change circulation paths 501 are symmetrically arranged on the flow channel plate 6 along the length direction of the upper cover plate 1 of the cold plate. The flow channel plate 6 is provided with a coolant passage 502 located at the same horizontal plane as the refrigerant phase change circulation path 501. Each pair of coolant passages 502 surrounds one of the refrigerant phase change circulation paths 501 and is provided with a liquid suction core 5 installed in the refrigerant phase change circulation path 501 for the circulation of refrigerant gas-liquid two-phase change. The liquid suction core 5 enables the circulation of refrigerant gas-liquid two-phase change to achieve a uniform temperature effect.

[0036] In this embodiment, one end of each of the two refrigerant phase change circulation paths 501 is fixed with a U-shaped tube 4 that is bent and flat at both ends. The U-shaped tube 4 is made of aluminum tube bent and the tube opening is flattened. The aluminum tube has an inner diameter of 10mm and a wall thickness of 1mm.

[0037] In this embodiment, a valve seat and a charging valve 3 are fixed on the U-shaped tube 4. The refrigerant charged by the charging valve 3 is R134a, 110g; the static pressure of the refrigerant is 5.5bar.

[0038] In this embodiment, the two refrigerant phase change circulation paths 501 are respectively provided with a coolant inlet 2 and a coolant outlet 201 at one end near the U-shaped tube 4.

[0039] In this embodiment, the liquid suction core 5 uses a steel wire mesh and a laser-etched plate. The size of the etched plate is 15mm*600mm*2mm, the etching depth is 0.5mm, and the stacked size of the sheared steel wire mesh is 15mm*600mm*3mm.

[0040] The implementation principle of a phase change uniform temperature battery heat exchange plate in this application embodiment is as follows: A certain mesh size and number of layers of steel wire mesh or a welded laser-etched plate is installed in the refrigerant phase change circulation passage 501 to replace the liquid absorber 5 through a U-shaped tube 4 and a welded filling valve 3, and a certain amount of refrigerant is filled in. Under working conditions, the coolant circulates to carry away the heat dissipated by the battery module. At the same time, in order to prevent the battery module from overheating locally and the coolant from rising along the path, the refrigerant phase change circulation passage 501 achieves a uniform temperature effect through the gas-liquid two-phase change of the refrigerant and the circulation of the refrigerant through the liquid absorber 5.

[0041] All structures in this application can be customized in terms of material and length according to actual usage. The attached drawings are schematic structural diagrams, and the actual dimensions can be adjusted accordingly.

[0042] The above description is only a preferred embodiment of this practice, but the scope of protection of this embodiment is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in this embodiment, based on the technical solution and the inventive concept of this embodiment, should be covered within the scope of protection of this embodiment.

Claims

1. A phase change uniform temperature battery heat exchange plate, characterized in that, include: Cold plate top plate; A flow channel plate is fixed to the bottom of the top cover of the cold plate. Two refrigerant phase change circulation paths are symmetrically arranged on the flow channel plate along the length of the top cover of the cold plate. A coolant passage is provided on the flow channel plate at the same horizontal plane as the refrigerant phase change circulation path. Each pair of coolant passages surrounds one of the refrigerant phase change circulation paths and a liquid suction core is installed in the refrigerant phase change circulation path to facilitate the flow of refrigerant gas-liquid two-phase change.

2. The phase change uniform temperature battery heat exchange plate according to claim 1, characterized in that, One end of each of the two refrigerant phase change circulation paths is fixed with a U-shaped tube that is bent and flat at both ends.

3. The phase change uniform temperature battery heat exchange plate according to claim 2, characterized in that, A valve seat and a filling valve are fixed on the U-shaped tube.

4. The phase change uniform temperature battery heat exchange plate according to claim 2, characterized in that, The two refrigerant phase change circulation paths are respectively provided with a coolant inlet and a coolant outlet at one end near the U-shaped tube.

5. A phase change uniform temperature battery heat exchange plate according to claim 1, characterized in that, The liquid-absorbing core is made of steel wire mesh and laser-etched plate.

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