The important composition and function analysis of the new energy vehicle battery thermal management system

The important task of the battery management system is to ensure that the battery pack works in a safe interval, provide necessary information for vehicle control, respond to and solve abnormalities in time, and determine the charge and discharge of the battery according to the ambient temperature, battery status, and vehicle requirements. Power, etc. The important functions of BMS include battery parameter monitoring, battery state estimation, online fault diagnosis, charging control, automatic equalization, thermal management, etc. The new energy vehicle battery thermal management system is mainly composed of heat conduction medium, measurement and control unit and temperature control equipment. After the heat-conducting medium contacts the battery pack, the heat generated in the battery system is dissipated to the external environment through the flow of the medium. The heat-conducting medium mainly includes air, liquid, and phase change materials. The measurement and control unit controls the temperature control equipment to perform corresponding thermal solutions by measuring the real-time temperature of the battery system and the battery module or even the different positions of the monomer. Thermal management system is one of the key technologies to deal with battery thermal issues and ensure the performance, safety and life of power lithium-ion batteries. On the one hand, it can absorb the swelling stress of the battery for buffering purposes, and on the other hand, it can serve as heat insulation. , In the case of thermal runaway of the battery cell, the thermal diffusion is suppressed and the accident is delayed. In the solution of heat insulation between square cells, some companies have already adopted aerogels, which are quite safe, but there is a cost problem that is very realizable. Important functions of the new energy vehicle battery thermal management system 1. Effectively dissipate heat when the battery temperature is high, and beware of thermal runaway accidents; 2. Warm up when the battery temperature is low, increase the battery temperature, and ensure charging at low temperatures. Discharge performance and safety; 3. Reduce the temperature difference in the battery pack, inhibit the formation of local hot zones, guard against excessive battery decay at high temperature locations, and reduce the overall life of the battery pack. Accurate measurement and monitoring of battery temperature; effective heat dissipation when the battery pack temperature is too high; rapid heating under low temperature conditions; ensuring the even distribution of the battery pack temperature field; matching the battery heat dissipation system with other heat dissipation units is also an important function of battery thermal management . The heat-related issues of the battery are the key factors that determine its performance, safety, life and cost. The temperature level of the lithium battery directly affects its energy and power performance in use. When the temperature is low, the available capacity of the battery will rapidly decay. Charging the battery at too low temperature may cause instantaneous voltage overcharge. It causes internal lithium evolution and then causes a short circuit. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete it. Previous: Do you know what is important for lithium battery separator materials?