低温型锂离子电池的研制

Development of low temperature Li-ion batteries

研究了锂离子电池电解液、负极活性物质颗粒度与电极涂布面密度等因素对电池低温性能的影响。结果表明:电解液在电池中的阻抗、负极材料粒度与涂布面密度均严重影响电池的低温性能。通过优化电池制备工艺,研制出了性能优良的低温型锂离子电池。电芯采用卷绕式结构,额定容量为5.5 Ah,电池在-40℃下恒温16 h后,0.2 C、1 C、2 C放电容量均为4.7 Ah,为额定容量的85%;3 C放电容量为4.6 Ah,为额定容量的83.6%。电池表现出良好的低温性能。

The effect of lithium ion battery electrolyte, granularities of anode material and electrode coating quantity on the cell performance at low temperature was studied. The results show that the AC impedance of the electrolyte, the granularity of anode material and electrode coating quantity seriously affect the cell performance at low temperature. Through optimizing preparation processes of battery, the low temperature type lithiumion battery was developed. The rated capacity of single battery with winding structure electric core is 5.5 Ah. After constant temperature for 16 h at -40 ℃, the discharge capacity of the battery at 0.2 C , 1 C, 2 C is 4.7 Ah, 85% of the rated capacity. The discharge capacity at 3 C is 4.6 Ah, 83.6% of the rated capacity. The battery shows good rate performance and low temperature performance.