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Why does high temperature cause lithium batteries to explode?

by:Vglory      2021-05-14
Why does the high temperature cause the lithium battery to burst, so you can ask further, what kind of environmental conditions are needed for the abnormal situation inside the battery? The reporter interviewed Professor Sun Jinhua from the State Key Laboratory of Fire Science of the University of Science and Technology of my country. Professor Sun said: If the charging method is not suitable, the lithium battery will generate a lot of heat in a short time and burst. In response to Sun's explanation, Liu Wei further added that the positive charge data of lithium batteries in the charging state, such as lithium cobalt oxide or lithium manganese acid, is unstable and will undergo differentiation, and high temperature will release oxygen. The released oxygen reacts with the organic solvent in the electrolyte, generating a lot of heat. In addition, under certain voltage applications, the solvent and the electrolyte itself may react, releasing a lot of heat and causing safety problems. How does the high temperature come from? What happens in the battery? We can't see it with the naked eye. But researchers can use certain technical tools to clearly see the changing process inside the battery. Dr. Qingsen Wang from the University of Science and Technology of my country conducted an experimental study on the thermal response of lithium batteries using an advanced microcalorimeter. Studies have found that the positive electrode active material, negative electrode active material and electrolyte of lithium batteries will undergo an exothermic reaction under normal use and abuse. With the release of heat, the reverberant gas adds to the internal pressure of the system, causing thermal expansion of the battery. If the safety measures fail, there is a potential risk of explosion. In addition, long-term phone calls will also cause battery heating, as well as heating of internal circuits and receivers. If a low-quality battery is used, it is very easy to cause an explosion. Someone will make a call while the phone is charging. When the phone is charging, the phone battery will be thermally attacked. If we continue to use it to make calls, heat will increase rapidly, which will only cause danger. 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: The correct use of mobile phone lithium batteries and storage conditions
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