Effect of Acupuncture Diameter on Thermal Runaway Behavior of Soft-Wrapped Ternary Lithium Battery
With the rapid development of new energy vehicles,the safety of lithium-ion batteries has attracted more and more attention.Taking the soft package ternary lithium battery as the research object,the thermal runaway behavior of the battery with different acupuncture diameter was characterized by voltage,temperature and internal resistance.Combined with the performance of each characteristic quantity,the effect of acupuncture diameter on the battery thermal runaway behavior was analyzed.According to the experimental results,the following conclusions are obtained:(1)affected by the heat dissipation of the steel needle,the time and amplitude of the initial voltage drop of the battery increase with the increase of the acupuncture diameter;(2)the increase of the acupuncture diameter will accelerate the thermal runaway of the battery,and the battery thermal runaway time lag is obvious under the smaller acupuncture diameter;(3)the internal reaction of the battery is more intense and the internal resistance fluctuates obviously when the acupuncture diameter is larger.
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