Ternary lithium batteries are smaller in size, higher capacity density, low temperature resistance, better cycling performance, and are the mainstream of new energy passenger cars.
However, this type of battery thermal stability is poor, ternary lithium battery thermal runaway temperature of about 200 ℃, high temperature battery internal chemical reaction is more intense, the reaction process will produce oxygen molecules, which will exacerbate the combustion of flammable gases, and may even be in a very short period of time to produce deflagration.
In the past 10 years, more than 30 electrochemical energy storage power station accidents have occurred worldwide, and most of the accidental power stations use ternary lithium batteries. Therefore, in order to ensure safety, large and medium-sized electrochemical energy storage station shall not be selected ternary lithium batteries, sodium sulfur batteries, should not be selected for the use of gradient power battery. Because of the power battery companies, technology routes and product specifications are different, resulting in the dismantling, evaluation and assembly of the gradient utilization of batteries is difficult, and mixed, if the scale of application is likely to cause safety accidents.
Overall, there are hundreds to tens of thousands of batteries in the electrochemical energy storage system, once the fire, the processing difficulty is very high, may also extend the expansion of the burn, therefore, in addition to the energy storage products itself qualified, on-site maintenance and management is very important, but also must be paired with the fire code, in order to effectively reduce the risk.