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We conducted an experimental analysis of the electro-thermal behavior of a 21,700 Li-ion cell, specifically a single NMC cell with a capacity of 3.7 V and 4 Ah. The cell was tested at various C-rates during charging and discharging. Temperatures at the positive node, center, and negative node were measured for each rate. The results revealed heat generation of 3.59 W at 1C, 4.61 W at 1.5C, 5.46W at 2C, and 6.69 W at 2.5C at 30 °C. At 40 °C, the heat increased to 4.09 W, 4.61 W, 6.033 W, and 6.41 W, respectively. Continuous power withdrawal was also tested to represent actual electric vehicle usage. The results indicate that as C-rates increase, the cell temperature rises. Additionally, higher C-rates and increased ambient temperature elevate the risk of thermal runaway.

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Electro-thermal Analysis of Li-Ion Cell

  • 会议论文

  • 发表日期：

    2025年

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  • Mihir Pandya,
  • Milan Vachhani,
  • Kalpak Sagar,
  • Hemant B. Mehta,
  • Vipul M. Patel

摘要

We conducted an experimental analysis of the electro-thermal behavior of a 21,700 Li-ion cell, specifically a single NMC cell with a capacity of 3.7 V and 4 Ah. The cell was tested at various C-rates during charging and discharging. Temperatures at the positive node, center, and negative node were measured for each rate. The results revealed heat generation of 3.59 W at 1C, 4.61 W at 1.5C, 5.46W at 2C, and 6.69 W at 2.5C at 30 °C. At 40 °C, the heat increased to 4.09 W, 4.61 W, 6.033 W, and 6.41 W, respectively. Continuous power withdrawal was also tested to represent actual electric vehicle usage. The results indicate that as C-rates increase, the cell temperature rises. Additionally, higher C-rates and increased ambient temperature elevate the risk of thermal runaway.