三元锂电池储能性能与工作环境温度关系研究

Research on relationship between energy storage performance and working temperature of ternary lithium battery

通过对三元锂电池分别进行充/放电容量测试,并结合脉冲实验,研究了三元锂电池在不同环境温度下的储能性能。结果表明,在放电过程中,随着环境温度从55℃降至-10℃,放电平台电压降低,放电容量减少。在高温(55℃)下放电容量是额定容量的105.0%,在低温(-10℃)下放电容量仅为额定容量的83.9%。随着环境温度降低,电池产热逐渐增大,内阻升高,放电功率减小,影响电池的正常使用。在充电过程中,随着环境温度从55℃降至-10℃,充电平台电压升高,内阻和充电功率升高,影响电池充电效率。

The energy storage performance of ternary lithium battery at different temperatures was researched by measuring the charge/discharge capacity and pulse test.The results show that during the discharging process,the discharge platform voltage and discharge capacity decrease with the temperature drops from 55℃to-10℃.The discharge capacity at high temperature(55℃)is 105.0%of the rated capacity,and the discharge capacity at low temperature(-10℃)is only 83.9%of the rated capacity.With the decrease of temperature,the heat production of the battery increases gradually,the internal resistance increases,and the discharge power decreases,affecting the normal use of the battery.During the charging process,the charge platform voltage increases with the temperature drops from 55℃to-10℃,the internal resistance and the charge power increase,affecting the battery charging efficiency.