For the new energy - lithium battery, its security is the most urgent to solve the problem, but also many manufacturers and consumers are most concerned about one of the issues. The following safety regulations include: structural safety, electrical safety, heat safety, chemical safety, environmental safety, three security, life cycle safety and other seven categories.
Structural safety: vibration, mechanical shock, drop, squeeze, flip, collision, piercing;
Electrical safety: overcharge, over discharge, short circuit, low temperature charging, electric shock (system), dust pollution, wading, flooding, fire, moisture;
Thermal safety: external high temperature, large impedance;
Chemical safety: corrosive, flammable;
Functional safety (power battery system): BMS redundancy, electromagnetic compatibility;
Environmental safety: temperature shock, hot and humid circulation, high altitude, electromagnetic compatibility;
Life cycle safety: the safety of the lithium battery throughout the life of the mechanical safety, electrical safety, heat safety, abuse of safety, three security performance and environmental safety.
From the safety of the lithium battery system, the ultimate need to focus on is concerned about thermal safety and electrical safety, in the two ultimate goal of the periphery is mainly the following:
(1) normal discharge protection (dust and water, anti-structural invasion and destruction, the normal environmental load: temperature shock, hot and humid circulation, high altitude, interference);
(2) protection under abuse (overcharge, over discharge, short circuit, low temperature charging, high temperature electricity);
(3) accident situation (drop, squeeze, flip, collision, acupuncture, fire, heat runaway, seawater immersion.
Power battery safety issues come from its energy release, including energy release and chemical release. The safety problem of the form of energy release is manifested as an electric shock (mainly a high pressure system of more than 6V). The ultimate manifestations of safety problems caused by chemical release are combustion or explosion due to thermal runaway and thermal runaway expansion.
