What are the important methods to control the heat dissipation of lithium battery packs?

(1) The use of high and low temperature resistant battery materials, including electrodes, electrolyte materials, etc., is a method based on the internal materials of the battery. The battery undergoes a chemical reaction, and the heat-generating components are the positive and negative electrodes, electrolytes, etc. Therefore, the performance of these materials is studied and improved to increase their temperature activity range. Regarding the electrode material, the key is to improve its thermal conductivity, so that the heat that appears inside the battery can be released in time, so as not to accumulate inside the battery and damage the battery. In order to improve the thermal conductivity of the electrode, copper and aluminum are added to the electrode carbon material. By improving the thermal stability of battery materials, the capacity of the battery is generally reduced, but the capacity of the battery is an important indicator of the battery. Therefore, improving the thermal performance of the battery material to improve the overall thermal performance of the battery has certain limitations. (2) Using air as the medium to dissipate heat is air sweeping across the surface of the battery to take away the heat from the battery surface. According to the cause of wind, it is divided into natural convection and forced convection. The wind formed naturally by the speed of the vehicle is natural convection, the forced wind using fans such as fans is forced convection, and the ventilation methods are divided into parallel and serial. Many researchers have found that parallel heat dissipation and ventilation are better, but the heat dissipation effect is also affected by the width of the runner. Due to the limited space of the car, and considering the cost, air heat dissipation is the most widely used. Based on air heat dissipation, people have studied the effect of parallel heat dissipation, and designed various arrangement structures of battery packs. In order to improve the heat dissipation performance of the wind, the wind baffle is designed and improved, the air duct is widened, and the heat dissipation effect is improved. Air heat dissipation costs are low and the structure is simple, but it is not so effective. When the battery discharge reaches a certain level and the external environment is high, even if the wind speed is added, the battery temperature cannot continue to drop. (3) The liquid cooling effect is stronger than air cooling by using liquid as the medium, but the structure is more complicated. Because many liquids cannot directly contact the battery, the liquid should be wrapped, pipes should be arranged between the batteries, jackets, etc.; and can be used with batteries Liquids in direct contact generally have poor flow properties and poor heat transfer effects. The heat pipe technology can also be called a kind of liquid heat dissipation. It depends on the phase change of the medium in the pipe, which will be accompanied by heat absorption and exotherm. The phase change is the change between liquid and gas, which is a kind of high-efficiency exchange. The application of thermal components in battery thermal management is also getting more and more attention. (4) Using phase change material as the medium. Phase change material can absorb and release a large amount of heat during phase change, but its own temperature change is not large. The phase change material can directly contact the battery and has a simple structure. Highlight its advantages. Phase change materials are highly efficient and feasible, simple in structure, and do not consume additional energy, but their low thermal conductivity will cause the dissolution state of phase change materials to vary greatly where they are in contact with high and low temperature batteries, thereby reducing heat dissipation performance. The application of phase change materials for battery thermal management is an important development direction in the future. 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 article: Application analysis of new lithium batteries in data centers