广东工业大学学报 ›› 2018, Vol. 35 ›› Issue (04): 94-99.doi: 10.12052/gdutxb.170169

• 综合研究 • 上一篇    下一篇

基于18650型磷酸铁锂动力电芯的产热和电化学行为分析

张江云, 张国庆, 黄启秋, 王烨   

  1. 广东工业大学 材料与能源学院, 广东 广州 510006
  • 收稿日期:2017-12-08 出版日期:2018-07-09 发布日期:2018-06-06
  • 通信作者: 张国庆(1963-),男,教授,博士生导师,主要研究方向为新能源汽车及节能环保.E-mail:pdzgq008@126.com E-mail:pdzgq008@126.com
  • 作者简介:张江云(1986-),女,博士研究生,主要研究方向为动力电池热管理系统设计.
  • 基金资助:
    广东省科技计划项目（2014B010128001）；广东省质量技术监督局科技项目（2015PJ03）；中国南方智谷引进创新团队和项目（2015CXTD07）

An Analysis of Heat Generation and Electrochemical Behaviors Based on 18650 LiFePO4 Power Batteries

Zhang Jiang-yun, Zhang Guo-qing, Huang Qi-qiu, Wang Ye   

  1. School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
  • Received:2017-12-08 Online:2018-07-09 Published:2018-06-06
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摘要： 测试某知名进口和国产的A款和B款18650磷酸铁锂动力电芯在室温（25℃）、低温（–20℃）和高温（55℃）下不同放电倍率的温度性能、产热行为和电化学性能，分析两款电芯放电容量、放电电压平台、交流阻抗、电芯过充循环后直流内阻随着荷电状态的变化规律.结果表明环境温度和放电电流越高，电芯最高温度和温升斜率急剧增加；室温10 C放电时，B款最高温度比A款增加13.2%； B款电芯低温工况大电流放电时，电芯仅放出2.65%的电量，几乎失去正常放电电压平台；电芯的直流内阻随着荷电量的增加呈下降的趋势，过充导致电芯的直流内阻最大增加24.19%.

关键词: 18650磷酸铁锂动力电芯, 温度性能, 产热行为, 电化学性能

Abstract: In order to obtain the temperature properties and heat generation behaviors about different levels of power batteries and provide theoretical guidance for practical industry application, the well-known import and domestic(Type A and Type B)18650 lithium iron phosphate power batteries with the similar technical parameters were selected for researching the heat generation behaviors and electrochemical properties with various discharge rates under different working conditions, including room temperature (25℃) and ultra-low temperature (-20℃) and higher temperature (55℃). The discharge capacity, discharge voltage platform, electrochemical impedance spectroscopy were conducted and analyzed. The impact of different states of charge (SOC) on internal resistance after overcharge cycles was summarized. Testing results indicate that the higher the ambient temperature and the discharge current, the higher the maximum temperature and temperature rise gradient. Compared with Type A battery, peak temperature of Type B increased by 13.2% at room temperature with 10 C discharge current. What is worse, Type B battery only emits 2.65% of the nominal capacity with 3 C discharge rate and nearly loses the normal discharge voltage platform under ultra-low condition. The internal resistance decreased with the SOC increase, which increased by 24.19% caused by the overcharge operations.

Key words: 18650 type LiFePO4 power batteries, temperature performance, heat generation behaviors, electrochemical properties

中图分类号: 

  • TK112
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