储能科学与技术 ›› 2017, Vol. 6 ›› Issue (2): 237-242.doi: 10.12028/j.issn.2095-4239.2016.0084

• 研究开发 • 上一篇    下一篇

老化对磷酸铁锂电池在绝热条件下的产热影响

罗  英1,2,3，吕桃林1,2，张熠霄2,3，晏莉琴2,3，刘  辉2,3，解晶莹1,2,3   

  1. 1哈尔滨工业大学化工学院，黑龙江 哈尔滨150001；2上海动力储能电池系统工程技术有限公司，上海 200241；3上海动力与储能电池系统工程技术研究中心，上海 200245
  • 收稿日期:2016-10-19 修回日期:2016-11-28 出版日期:2017-03-01 发布日期:2017-03-01
  • 通讯作者: 解晶莹，研究员，研究方向为化学电源相关先进材料、电池及系统设计，E-mail：jyxie@mail.sim.ac.cn。
  • 作者简介:罗英（1986—），女，博士研究生，研究方向为电池安全性测试以及性能衰减分析，E-mail：cqjjsmly_0120@163.com；
  • 基金资助:
    国家高技术研究发展计划（863计划）（2014AA052202），国家自然科学基金（21373137），上海动力与储能电池系统工程技术研究中心（15DZ2282000）项目。

Influence of aging on the heat-release of the lithium iron phosphate battery under adiabatic conditions

LUO Ying1,2,3, LV Taolin1,2, ZHANG Yixiao2,3, YAN Liqin2,3, LIU Hui2,3, XIE Jingying1,2,3   

  1. 1Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China; 2Shanghai Power & Energy Storage Battery System Engineering Tech. Co. Ltd., Shanghai 200241, China; 3Shanghai Engineering Center for Power and Energy Storage Systems, Shanghai 200245, China
  • Received:2016-10-19 Revised:2016-11-28 Online:2017-03-01 Published:2017-03-01

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摘要： 采用加速量热仪对不同老化状态下的磷酸铁锂电池在绝热条件下的充放电和过充电产热展开研究，并考察循环次数、循环倍率、搁置时间、搁置荷电态等老化因素对锂离子电池过充特性的影响。结果表明，随着循环次数增加，电池充放电和过充电平均发热功率均增加。相比于0.5C循环，以1C倍率循环的电池过充升温幅度以及平均发热功率反而减少。这可能是由于电池在高倍率下循环形成较厚的界面膜，消耗了部分电解液，导致过充过程中可分解的电解液总量减少，从而使得放热量减少，放热平均功率降低。随着高温搁置时间增加，电池充放电和过充电平均发热功率同样增加。而满电态搁置的电池的过充升温幅度以及平均发热功率小于半电态搁置的电池。这可能与电池在高荷电态下搁置电解液量分解更多有关。在相近的容量损失情况下，搁置老化对电池的充放电和过充平均发热功率的影响更大。

关键词: 锂离子电池, 老化, 绝热条件, 产热

Abstract: An Accelerating Rate Calorimeter was employed to study the heat release of lithium iron phosphate battery with different ageing status under adiabatic condition. Thermal behavior of lithium iron phosphate battery charged and discharged at 1C was researched，and the influence of cycle number, cycle rate, storage time and storage temperature on the overcharge test of lithium iron phosphate battery was studied. With the increase of the cycle numbers, the average power of the battery charge-discharge and overcharge increases. The raising range of the temperature and average heat power of the battery cycled at 1C is decreased, compared with that of battery cycled at 0.5C. This may be due to the decomposition of the electrolyte and the formation of a thick surface film, leading to the reduction of the total heat and average power, when the battery is cycled at high rate. With the increase of the storage time at the high temperature, the average power of the battery charge-discharge and overcharge increase as well. Furthermore, the raising range of the temperature and average heat power of the lithium iron phosphate battery with 100% SOC full power of the battery is smaller than that of battery with 50% SOC, which may be related to the stronger decomposition of the electrolyte at high state of charge. In the case of similar capacity loss, the influence of storage on the average power of the charge-discharge and the overcharge for the lithium iron phosphate battery is greater.

Key words: lithium ion battery, aging, adiabatic condition, heat-release