Introduce new energy vehicle battery thermal management system

New energy vehicle battery thermal management system analysis. The battery pack is an important energy storage device for loading battery packs on electric vehicles. It is a key component of hybrid mobile/electric vehicles. Its functions directly affect the functions of hybrid mobile/electric vehicles. Now batteries generally have shortcomings such as low specific energy and specific power, short cycle life, and temperature-dependent performance. Due to the limited space of the vehicle, the heat accumulated during the operation of the battery will cause uneven ground temperature and affect the uniformity of the battery cells. This will reduce the battery's charge-discharge cycle power and affect the battery's power and energy performance. In severe cases, it will also cause thermal runaway, affecting the safety and reliability of the system. In order to make the battery pack play the best function and life, it is necessary to heat the battery and control the temperature of the battery pack within a reasonable range. The important functions of battery heat treatment include: accurate measurement and monitoring of battery temperature; effective heat dissipation when the battery is overheated; rapid heating at low temperature; ensuring uniform battery temperature field distribution; battery cooling system matching with other cooling devices. There are two ways to cool the battery pack: air cooling and liquid cooling. Studies have shown that the air-cooling method is easy to end, but the temperature gradient of the battery pack is not conducive to the stable operation of the battery. In air-conditioning systems, liquid cooling in which heat is exchanged between coolants and refrigerants has gradually become the mainstream. In order to scientifically solve the thermal problem of new energy vehicle batteries, it is necessary to consider the mutual influence of multiple systems. As shown in Figure 1, there are varying degrees of coupling between battery pack cooling and automotive air conditioning systems, motor cooling systems, and engine cooling systems. Therefore, in the battery system temperature control strategy, heat treatment should be combined with other systems to analyze the impact. The treatment method is to solve the complex coupling problem between the flow systems in the battery heat treatment process, and you can use the evaporation cycle library, liquid cooling library and battery library of Dymola software to establish a one-dimensional simulation model. Simulate the entire model system and analyze the coupling between different systems, thus ending the control of the complex system. Dymola software has a wealth of model libraries. Selecting basic libraries and commercial libraries can facilitate the establishment of battery heat treatment systems. The evaporative circulation library covers almost all the mainstream refrigerants in the market. The basic component model that considers the influence of component heating and temperature on the electrical function of the component, including resistors, diodes, thyristors and motors; the heat transfer unit model has heat capacity, heat conduction, convection, radiation, temperature, heat flow boundary conditions; it can be used for battery liquid flow pipelines Modeling, component selection, and system function discussion of the liquid cooling tank, including models such as pipes, control valves, thermostatic valves, pumps, fans, heat exchangers, expansion tanks, etc.; taking into account the differences in battery cells and the impact of temperature on battery capacity and For the influence of external characteristics, the battery library model can be used to analyze the characteristics of the battery, such as electricity, heat, and 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 post: Calculation of 18650 lithium battery charging time and discharge time