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Overcharge investigation of large format lithium-ion pouch cells with Li(Ni0.6Co0.2Mn0.2)O2 cathode for electric vehicles: Thermal runaway features and safety management method

Journal Article · · Energy (Oxford)
 [1];  [2];  [3];  [4];  [2];  [3];  [2]
  1. Beijing Inst. of Technology (China). National Engineering Lab. for Electric Vehicles; Collaborative Innovation Center for Electric Vehicles in Beijing (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  2. Beijing Inst. of Technology (China). National Engineering Lab. for Electric Vehicles; Collaborative Innovation Center for Electric Vehicles in Beijing (China)
  3. China North Vehicle Research Inst., Beijing (China). State-assigned Electric Vehicle Power Battery Testing Center
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
The overcharge-induced thermal runaway features of large format commercial lithium-ion batteries with Li(Ni0.6Co0.2Mn0.2)O2 (NCM622) cathode for electric vehicles under different current rates (C-rates) have been systematically studied at ambient temperature. The overcharge process is characterized as four stages. The temperature rise and the maximum temperature of the battery surface don't increase in proportion to the applied C-rates. However, with the increase of C-rates, the crest voltage of voltage curve rises linearly. When the voltage reaches approximately 5.1 V, a new voltage plateau appears in the cases below 2C. It is not sufficient that the temperature sensor is placed only near the terminal tab for most battery packs of EVs. In addition, the accumulated heat analysis demonstrates that side reactions dominate the temperature rise and contribute to most of the accumulated heat before thermal runaway. To mitigate the impact of overcharge and avoid the thermal runaway risk, a safety management method is proposed. Furthermore, the sharp drop in voltage before thermal runaway also provides a feasible approach to forewarn the users of the impending risk. These results are important for building safer batteries and providing information for the safety monitoring function of the battery management system (BMS).
Research Organization:
Beijing Inst. of Technology (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
China Scholarship Council; National Natural Science Foundation of China (NSFC); USDOE; USDOE Office of Electricity Delivery and Energy Reliability (OE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1494873
Alternate ID(s):
OSTI ID: 1636567
Journal Information:
Energy (Oxford), Journal Name: Energy (Oxford) Vol. 169; ISSN 0360-5442
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Thermal safety study of Li‐ion batteries under limited overcharge abuse based on coupled electrochemical‐thermal model journal April 2020
Influence of Current Rate on the Degradation Behavior of Lithium-Ion Battery under Overcharge Condition journal January 2019

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