Analysis of the safety classification of power lithium-ion batteries

The safety of power lithium-ion batteries includes: structural safety, electrical safety, thermal safety, chemical safety, environmental safety, three prevention safety, and life cycle safety. Structural safety: vibration, mechanical shock, drop, squeeze, flip, collision, puncture; electrical safety: overcharge, overdischarge, short circuit, low temperature charging, electric shock (system), dust pollution, wading, flooding, fire, Humidity; thermal safety: external high temperature, large impedance; chemical safety: corrosive, flammable; functional safety (power lithium-ion battery system): BMS redundant function, electromagnetic compatibility; environmental safety: temperature shock, damp heat cycle, high altitude , Electromagnetic compatibility; life cycle safety: the mechanical safety, electrical safety, thermal safety, abuse safety, environmental safety and three-proof safety performance of the power lithium-ion battery (system) during the whole life cycle. In terms of battery system safety, the final result is to focus on thermal safety and electrical safety. Outside these two final goals are the first lines of defense: (1) Protection under normal working conditions (dust and waterproof, structural intrusion and loss , Normal environmental load: temperature shock, damp heat cycle, high altitude, interference resistance); (2) Protection under abuse conditions (overcharge, overdischarge, short circuit, low-temperature charging, high-temperature electricity); (3) Under accident conditions ( Falling, squeezing, flipping, collision, acupuncture, fire, thermal runaway, seawater immersion. The safety problem of power lithium ion battery comes from its energy release, and the form includes electric energy release and chemical energy release. The safety problem formed by the form of electric energy release is manifested It is an electric shock (critically refers to a high-voltage system above 6V). The final manifestation of the safety problem caused by the release of chemical energy is the combustion or explosion caused by thermal runaway and thermal runaway expansion. Disclaimer: 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: What is the working principle of dry batteries? Can dry batteries be rechargeable?