What is the cause of polymer lithium battery explosion?

Source: 2020 - 04 - 11 nobleman hits: lithium polymer battery explosion in the battery industry in the 21st century, the cause of the latest model of the highest technical content, variety, is a polymer lithium ion battery. Latest generation of rechargeable lithium ion batteries with lithium cobalt oxide as the anode, carbon cathode. To sum up, although polymer lithium ion battery has many advantages, but the liquid lithium ion battery explosion potential should not be ignored. Why, then, lithium batteries will explode? According to the author many aspects of textual research, the reasons are as follows: 1. ( Internal short circuit) The biggest worry is: lithium ion battery in the case of overload ( Even if the normal charging and discharging, low temperature below - 20) Lithium-ion accumulated in the cathode dendrite formation, the membrane, forming an internal short circuit. 2. 【 Produce large current 】 : external short circuit, internal short circuit will produce hundreds of ampere of excessive current. 3, electrolytic gas. : lithium ion batteries to achieve single battery 3 - only 4. 2 V high working voltage ( Nickel-metal hydride and nickel working voltage 1. 2 V battery, lead acid battery voltage is 2 V) , decomposition of organic electrolyte voltage must be taken to greater than 2 V, and use organic electrolyte under the condition of high current, high temperature electrolysis, electrolytic produce gas. 4, combustion and explosion 】 : the heat generated by the large current and high pressure conditions, More than 5 v) Could happen, positive lithium oxide oxidation reaction, precipitation, metallic lithium in the case of a gas causes the shell burst, direct contact with air, lead to combustion, ignition electrolyte at the same time, strong fire, gases expand rapidly, the explosion. 5. 【 External cause. , such as acupuncture, impact temperature, gases expand rapidly and cause explosion.