Analysis of the cause of the fire of the lithium battery

Lithium battery fire causes battery overheating: battery overheating will constitute thermal runaway, which is most likely to occur during battery charging and discharging. Because the lithium battery itself has a certain internal resistance, a certain amount of heat will be generated when the electric power is outputted by pure electric power. Therefore, their temperature becomes very high. When the body temperature exceeds the normal working temperature range, it will damage the battery life and safety. Influence of external force: Under the use of external force, lithium battery cells and battery packs are deformed, and relative displacement occurs in batteries in different regions, causing the battery diaphragm to tear and internal short circuit, and finally flammable electrolyte leakage causes fire. Under the influence of external force, the puncture damage is the most serious. It can be directly inserted into the battery body to form a direct short circuit between the positive and negative electrodes. Improper use of electricity: When an external short circuit occurs, the heat generated by the battery cannot be dissipated well, and the battery temperature will rise, and the high temperature will trigger the thermal control. Overdischarge is one of the least harmful behaviors in the use of lithium battery packaging, but the growth of lithium dendrites formed by overdischarge will reduce the safety of the battery and increase the possibility of thermal runaway. The use of lithium battery packs during charging is the most destructive misconduct. Lithium dendrites grow on the surface of the anode, which is due to excessive intercalation of lithium. Secondly, excessive de-embedding of lithium will cause the cathode structure to collapse due to the release of heat and oxygen (oxygen release from the NCA cathode). The release of oxygen accelerates the composition of the electrolyte, and a large amount of gas appears. Due to the increase in internal pressure, the exhaust valve opens and the battery begins to exhaust. When the active material in the battery comes into contact with the air, it will react strongly, releasing a lot of heat, and then causing the lithium battery to calm down and catch fire. Thermal runaway: When the external environment temperature is too high or the temperature control system fails to work, the battery heat is too high, resulting in a short circuit of the lithium battery, resulting in thermal runaway. In practical applications, thermal management systems such as lithium battery collisions, damage, battery internal structure, functions, and air conditioning system failures may cause heat to run out of control. Lithium battery packs are very dangerous, but there are many lithium battery pack products in our lives, and the actual dangerous work is very few. This is because consumer manufacturers have stopped adequate safety measures during the consumer design process of lithium battery packs to ensure the safety of lithium battery packs and guarantee the safety statement of customers: Some pictures and content of articles published on this site are from the Internet, If there is any infringement, please contact to delete the previous article: Is the soft pack lithium battery pack safe?