Analyze the specific factors that cause thermal runaway of lithium batteries

Analysis of the causes of thermal runaway of industrial lithium batteries is one of the key components of the most electric vehicles. It belongs to the continuous improvement of the industrial density of lithium batteries in the lithium battery industry. There are two types of ternary lithium iron phosphate lithium-ion batteries for electric vehicles. No matter which one you choose is inseparable from the lithium battery, part of the electric energy is converted into chemical energy, and part of the electric energy is converted into heat energy. It is normal for the rechargeable battery to generate heat, but it is safe to touch the battery. How to deal with the lithium cannot be taken out of control? So today, we will analyze the specific factors that may cause the thermal runaway of the lithium battery. The higher the charge and discharge rate, the greater the current, the greater the internal resistance, and the greater the heat generation. Therefore, at a high charging rate, the thermal efficiency of the battery is faster. If the cooling system does not release heat in time, the heat will gradually accumulate. Internal resistance The formation of internal resistance is related to power output, DOD, temperature and so on. The greater the internal resistance, the lower the electrical energy and the more heat storage. Especially when the SOC is less than 20%, the resistance rises sharply, the current demand decreases, and the battery output power decreases to ensure battery safety. Capacity and ambient temperature The larger the battery capacity, the more electrochemical reactions and the more heat generated. The required heat dissipation capacity is relatively large. If the heat dissipation cannot be satisfied, more and more heat will appear. The higher the ambient temperature, the lower the heat transfer coefficient and the worse the heat transfer effect. Especially for large-capacity pure electric vehicles, air cooling is difficult to meet the heat demand. Due to the particularity of industrial lithium batteries, there are very strict requirements for their use and management. Now, in order to prevent battery thermal runaway, the power structure of the battery technology plan is in the battery thermal runaway. As we know, there is now a power lithium-ion battery thermal management system, which includes ventilation, cooling and other systems, and secondly, such as the surface of the battery. Thermal control planning skills (PTC), ceramic coating on the cathode surface and overload additives, maintenance of voltage sensitive gaps and comprehensive application of flame-retardant electrolyte technologies to improve the safety performance of single cells. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete it.