Research on the risk of thermal runaway and characteristics of combustion traces of 18650 ternary lithium batteries
In order to study the thermal runaway risk of ternary lithium batteries,18650 nickel cobalt manganese ternary lithium batteries were selected as the research object,and a testing plat-form for measuring the characteristic parameters of battery ther-mal runaway process was built to explore the thermal runaway process and combustion trace characteristics of lithium-ion batter-ies under different states of charge,electrical abuse,and thermal abuse.The results show that the positive current collector plate of lithium batteries has a certain protective effect on thermal run-away caused by overcharging and short circuit of the battery.When the SOC is above 25%,the degree of thermal runaway damage to the battery is directly proportional to the charge.By combining the characteristics of voltage and temperature changes before and after thermal runaway in lithium-ion batteries,as well as the characteristics of battery explosion and combustion,the characteristic peaks of the temperature curve can be used to deter-mine the state of the battery that has experienced thermal run-away,and X-ray and voltage changes can be combined to deter-mine the fault state of the battery and trace the location of the fire in the lithium-ion battery.The research results can provide refer-ence basis for lithium battery design,lithium battery fire extin-guishing,and fire investigation.
nickel cobalt manganese ternary lithium batteryover-chargingthermal runawaytemperatureburning marks
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