Journal of Guangdong University of Technology ›› 2018, Vol. 35 ›› Issue (04): 94-99.doi: 10.12052/gdutxb.170169

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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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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

CLC Number: 

  • TK112
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