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An experimental study on the thermal characteristics of the Cell-To-Pack system

Author

Listed:
  • Wang, Huaibin
  • Wang, Shuyu
  • Feng, Xuning
  • Zhang, Xuan
  • Dai, Kangwei
  • Sheng, Jun
  • Zhao, Zhenyang
  • Du, Zhiming
  • Zhang, Zelin
  • Shen, Kai
  • Xu, Chengshan
  • Wang, Qinzheng
  • Sun, Xiaoyu
  • Li, Yanliang
  • Ling, Jiaju
  • Feng, Jiani
  • Wang, Hewu
  • Ouyang, Minggao

Abstract

The development of electric vehicle batteries has resulted in high energy density battery pack. Cell-to-Pack (CTP) omits the cell module assembly, can reduce battery pack parts by 40%, improve the battery pack volume utilization rate by 15%–20%. However, the thermal characteristics of CTP under full operating conditions has yet to be verified, the CTP temperature calibration cycle under full working condition is time-consuming, and little analysis has been conducted on CTP internal temperature differentials and heat flow. The present study aims to thermal characteristics of CTP. Results show that CTP temperature calibration based on a thermal resistance grid can realize internal temperature reconstruction, optimum temperature arrangement, and shorten the calibration period by more than 60%. In addition, higher ambient temperatures can increase the maximum temperature of the jelly rolls in CTP cells, while lower ambient temperature can lead to larger differences in jelly roll temperature within a cell; and high-speed driving and fast charging can lead to the highest temperature increase rates under different working conditions up to 0.05 °C s−1.70% of the heat generated during cell discharge is used for self-heating, and the heat dissipation of liquid cooled plate is the main heat dissipation channel.

Suggested Citation

  • Wang, Huaibin & Wang, Shuyu & Feng, Xuning & Zhang, Xuan & Dai, Kangwei & Sheng, Jun & Zhao, Zhenyang & Du, Zhiming & Zhang, Zelin & Shen, Kai & Xu, Chengshan & Wang, Qinzheng & Sun, Xiaoyu & Li, Yanl, 2021. "An experimental study on the thermal characteristics of the Cell-To-Pack system," Energy, Elsevier, vol. 227(C).
    • Handle: RePEc:eee:energy:v:227:y:2021:i:c:s0360544221005879
    DOI: 10.1016/j.energy.2021.120338
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    References listed on IDEAS

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    1. Huang, Deyang & Chen, Ziqiang & Zhou, Shiyao, 2022. "Self-powered heating strategy for lithium-ion battery pack applied in extremely cold climates," Energy, Elsevier, vol. 239(PB).
    2. Jia, Zhuangzhuang & Huang, Zonghou & Zhai, Hongju & Qin, Pen & Zhang, Yue & Li, Yawen & Wang, Qingsong, 2022. "Experimental investigation on thermal runaway propagation of 18,650 lithium-ion battery modules with two cathode materials at low pressure," Energy, Elsevier, vol. 251(C).
    3. Li, Yalun & Gao, Xinlei & Feng, Xuning & Ren, Dongsheng & Li, Yan & Hou, Junxian & Wu, Yu & Du, Jiuyu & Lu, Languang & Ouyang, Minggao, 2022. "Battery eruption triggered by plated lithium on an anode during thermal runaway after fast charging," Energy, Elsevier, vol. 239(PB).

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