External short-circuit behaviors of commercial prismatic lithium-ion batteries with high capacity
External short-circuit(ESC)is one of the main sources for battery failures,which can cause large current value in short period,increasing the risk of thermal runaway.However,current study mainly focuses on the ESC behaviors of Lithium-ion batteries(LIBs)with less capacity,which is significantly distinguished form that of LIBs with high capacity.Herein,ESC experiments were conducted under various resistances to investigate short circuit behaviors of commercial prismatic LIBs with 51 Ah and based on NCM622 cathode,and especially for the evolution of temperature.The results indicate the discharge capacity and current value are both contributing to temperature rise.Furthermore,heat conductivity and temperature rise show unbalance relation,leading to hysteretic characteristic for high capacity prismatic LIBs.Post-mortem analysis of LIBs after ESC showed that cathode materials peeling off from current collector and cathode materials adhering to separator and copper plating on cathode demonstrated irreversible damage to LIBs.The ESC mechanism was proposed based on the ESC behaviors including the evolution of current,voltage and temperature.
external short-circuit behaviorshigh capacity LIBstemperature characteristicshysteretic temperature rise
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