Introduction to Lithium Battery Thermal Protection

Introduction to Lithium Battery Thermal Protection In many lithium battery maintenance plans, multi-level maintenance plans are widely used to achieve the high safety of lithium batteries. Multi-stage maintenance usually includes automatic maintenance and mandatory maintenance plans. The basic parameters of control are voltage, current, and temperature. In recent years, due to the limited increase in energy density, fast charging is ubiquitous in order to meet customer application requirements. From the perspective of planning practice and certification inspection, the customer pays more attention to voltage monitoring and maintenance, ignoring the previously used PTC, mhp-ta and other mandatory maintenance equipment, choosing two sets of IC+Mos automatic maintenance plan and NTC temperature monitor. Whether this plan is unreasonable has always been controversial in the industry. This article tries to briefly talk about two viewpoints from practice. At the end of the battery life, the internal resistance of the battery may increase abnormally. At this time, continuous high power input and output will inevitably lead to an increase in temperature. Generally speaking, every time the temperature increases by 10°C, the chemical reaction rate will double, and the accelerated chemical reaction will cause the battery to accelerate the aging. In other words, this is a vicious circle of autocatalysis. The current method relies heavily on NTC automatic temperature monitoring and lacks mandatory over-temperature maintenance. This method assumes that the battery temperature is uniformly distributed and the heat conduction speed is fast, which is difficult to achieve in practical applications. The temperature inside the battery must be transmitted to the NTC on the board to effectively tell the automatic device to respond. This process requires a longer time and temperature difference. Mhp-ta and StrapPPTC are the fastest methods to detect abnormal temperature inside the battery, because they are directly connected to the tabs, and the high-speed heat conduction path of the battery is along the current circuit. Therefore, it is also an ideal choice for forced temperature maintenance equipment. The battery safety cycle starts with the plan and ends with the battery recycling. The planning method should consider the abnormal conditions of the whole life of the lithium battery, and fully consider and evaluate the maintenance method. 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: Tesla battery life attenuation and life analysis