Causes of thermal runaway of lithium iron phosphate batteries

The thermal runaway of lithium iron phosphate battery is important because the internal heat generation is much higher than the heat dissipation rate, and a large amount of heat is accumulated inside the lithium ion battery, which causes a chain reaction, which causes the battery to catch fire and explode. (1) Overheating triggers burning out of control. The reason for the overheating of power lithium iron phosphate batteries comes from the injustice of battery selection and thermal design. The temperature of the battery may rise due to an external short circuit, the discussion of the cable is loose, etc., should be from the battery design And the battery management two aspects to deal with. From the perspective of battery material design, we can develop materials to prevent thermal runaway and block the reverberation of thermal runaway; from the perspective of battery management, we can predict the temperature range of the difference to convey the security level of the difference, so as to hold a graded alarm. (2) Overcharge trigger burnout of control Thermal runaway triggered by overcharge refers to the lack of safety performance of the overcharge circuit in the lithium iron phosphate battery management system, which causes the battery's BMS to be out of control but still being charged. For this type of overcharge, the first step is to find the obstacles of the charger, which can be handled through the full redundancy of the charger; secondly, to see the unfairness of the battery management, such as not monitoring the voltage of each battery. (3) Internal short circuit triggers burning out of control battery manufacturing impurities, metal particles, charge and discharge expansion and contraction, lithium evolution, etc., may all cause internal short circuits. This kind of internal short circuit is caused by dullness, it takes a long time, and I don't know when it will show thermal runaway. If a trial is held, it cannot be verified repeatedly. At present, experts all over the world have not found the process of internal short circuit caused by impurities, and they are all studying. To deal with the internal short circuit problem, we must first find a battery manufacturer with good product quality, select lithium iron phosphate batteries and battery cell capacity; secondly, conduct a safe prediction of internal short circuits. Before thermal runaway occurs, we must find the orders with internal short circuits. body. (4) The machine triggers the burn out of control collision is a typical method for the machine to trigger burn out of control. If a simulation of a collision is conducted in the trial room, the closest is acupuncture. Through acupuncture tests on ternary lithium-ion batteries and lithium iron phosphate batteries to study the process of thermal runaway, the invention of lithium iron phosphate batteries in this thermal runaway process is not as violent as the ternary lithium-ion battery exotherms. Try to confess that different materials will have different reverberations during acupuncture, and lithium iron phosphate is relatively peaceful. 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: How harmful is the waste lead-acid battery?