What are the cooling methods for automotive power lithium battery packs

The first type: heat pipe cooling heat pipe cooling technology process, the heat pipe is placed on the surface of the lithium battery pack, the lithium battery pack causes heat to evaporate the liquid in the heat pipe, and then the other end of the heat pipe that is not receiving heat is cooled into a cycle of liquid returning to the hot end. . The circulation takes away the heat from the hot end of the heat pipe, thereby reducing the heat of the battery pack. The heat pipe just needs to be in a vacuum environment, so that the boiling point in the heat pipe can be lowered, and the cooling rate will be faster. The second type: natural cooling. Of course, refrigeration does not have additional heat transfer equipment. For example, BYD Auto selected LFP lithium-ion electric vehicle operating systems for natural refrigeration in Qin, Tang, Song, E6, Tenggeng, etc. According to survey statistics, BYD Auto will switch to water cooling and heat pipe heat dissipation in the selected ternary lithium-ion operating system. Natural cooling does not have additional devices to carry out heat exchange. For example, BYD uses natural cooling in Qin, Tang, Song, E6, Tenshi and other car models that use LFp batteries. According to the knowledge, BYD will switch to liquid cooling in car models that use ternary batteries. The third type: air-cooled traditional cooling technology. This technology is generally used by people and is very simple. It uses external material interference. For example, wind, liquid, etc. are used to dissipate heat from the lithium battery pack heat pipe. The air-cooled type uses gas as the heat transfer material. There are two common types. The first type is currently called the general air-cooled type. The external air is immediately selected for heat transfer. The second type is positive air cooling, which can be heated or cooled before entering the rechargeable battery system software. In the earliest days, many pure electric vehicles in Japan and South Korea used air-cooled mode. For air cooling, air is selected as the heat exchange medium. There are two common types. The first type is called passive air cooling, which uses external air to exchange heat. The second type is active air cooling, which can heat or cool the outside air before entering the battery operating system. In the earliest days, many Japanese and Korean electric vehicles used air cooling. Fourth: Liquid-cooled water cooling uses automotive antifreeze (such as glycol) as the heat transfer material. In the mode circuit, such as the Volt control circuit with heat pipe radiator, the control circuit of large central air conditioner, the ptc heater control circuit, and the intelligent management system of rechargeable battery carry out adjustment and conversion according to the thermal management mode. Liquid cooling uses antifreeze (for example, glycol) as the heat transfer medium. In the method, there will generally be multiple different heat exchange loops, for example, VOLT has a radiator loop, a car air conditioning loop, and a pTC loop. The battery management system responds and adjusts and switches based on the thermal management strategy. Liquid cooling uses antifreeze (for example, glycol) as the heat transfer medium. In the method, there will generally be multiple different heat exchange loops, for example, VOLT has a radiator loop, a car air conditioning loop, and a pTC loop. The battery management system responds and adjusts and switches based on the thermal management strategy. Fifth: Direct cooling The direct cooling medium can absorb a large amount of heat during the whole process of high-efficiency liquid phase transformation. Compared with the engine coolant, the heat transfer efficiency can be increased by 3 times or more. The straight cooling system software has the advantages of compact software, lighter weight, and good performance. However, this system software is a dual air-conditioning evaporator system software, the system software does not have rechargeable battery heating, no water maintenance, the condenser ambient temperature is not easy to control, and the service life of the refrigerant system software is relatively poor. Direct cooling uses refrigerant as the heat exchange medium. The refrigerant can absorb a large amount of heat during the entire process of gas-liquid transformation. In contrast, the heat exchange efficiency of refrigerant can be increased by 3 times or more, and the battery can be replaced more quickly. The heat inside the operating system is taken away. The direct cooling operating system has the advantages of compact operating system, lighter weight and good performance. But this operating system is a dual evaporator operating system, the operating system does not have battery heating, there is no condensate protection, the refrigerant environment temperature is not easy to control, and the refrigerant operating system has a poor life. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to apply for PSE certification for lithium batteries?