Abstract：Mechanism modeling of high C-rate LiFePO4 battery is very important to guide the design and application of battery. However, the full order mechanism model has high complexity, and the simplified form fits bad in high C-rate currently. To solve these problems, a simplified electrochemical thermal coupling mechanism model was established by combining the simplified pseudo-two-dimensions (P2D) electrochemical model with the two-state thermal model. Through parameter identification, the model can well fit the actual battery discharge curves in a wide range of 10~40C high rate. Based on the identified model, the internal evolution mechanism corresponding to the trend of external curves under high C-rate discharge was analyzed. The results show that: the seconds level sharp decrease of battery terminal voltage in the high C-rate discharge initial period is related to the heterogeneity of Li+ concentration distribution in the electrolyte phase, and the recovery of the terminal voltage in the intermediate period is due to the increasing activity of internal materials caused by the temperature rise.
严康为, 龙鑫林, 鲁军勇, 柳应全, 吴羿廷. 高倍率磷酸铁锂电池简化机理建模与放电特性分析[J]. 电工技术学报, 2022, 37(3): 599-609.
Yan Kangwei, Long Xinlin, Lu Junyong, Liu Yingquan, Wu Yiting. Simplified Mechanism Modeling and Discharge Characteristic Analysis of High C-Rate LiFePO4 Battery. Transactions of China Electrotechnical Society, 2022, 37(3): 599-609.
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