Experiment Research on Safety Characteristics of Lithium-ion Batteries
In order to study the safety performance of lithium-ion batteries when punctured,aiming at three types of typical 18650 lithium-ion batteries,one of which is a lithium cobalt oxide cathode and two of which are ternary material cathodes,the puncture experiments of lithium-ion batteries with different cathode materials and different energy density were carried out,and the safety performance of lithium-ion batteries was analyzed from three aspects of surface temperature,temperature rise rate,and side wall rupture degree. The results show that lithium cobalt oxide batteries have a faster rate of the thermal runaway temperature rise,a higher maximum surface temperature,and a lower risk of the sidewall rupture than those of ter-nary lithium-ion batteries;that the SOC threshold of the puncture thermal runaway of lithium-ion batteries with a high-ener-gy-density is lower than that of lithium-ion batteries with a low-energy-density,while the temperature rise rate is faster;and that the energy density has a greater impact on the safety performance of lithium-ion batteries for anode materials of lithi-um-ion batteries.
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