主要考核了目前市场上畅销的电动自行车用锂离子蓄电池(48V/12Ah)在低温(-20℃)环境下的放电容量、容量保持率与放电次数的关系,绘制了常温充放电曲线和不同温度放电容量曲线,分析了锂离子蓄电池在不同温度环境下容量衰减原因。通过统计数据和分析低温(-20℃)环境锂离子电池的容量保持率,为广大用户提供了锂电池抗低温能力的可靠参考,同时为锂离子电池的生产和制造提供一定的参考与指导。

This paper mainly examines the relationship between the discharge capacity and capacity retention rate and the number of discharges of the best-selling lithium-ion battery for electric bicycles(48 V/12 Ah)in low temperature(-20 ℃)environment.At the same time,the chargedischarge curve at room temperature(23℃)and the discharge capacity curve at different temperatures were plotted.The causes of the discharge capacity decay of lithium ion batteries under different temperature environments are analyzed.Through statistical data and analysis of the lowtemperature(-20 ℃)environment lithium-ion battery capacity retention rate,to provide users with a reliable reference for lithium battery low temperature resistance,while providing some reference and guidance for the production and manufacture of lithium-ion batteries.