高倍率磷酸铁锂电池简化机理建模与放电特性分析

doi:10.19595/j.cnki.1000-6753.tces.201206

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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.

Key words： High C-rate LiFePO₄ battery mechanism model electrolyte phase diffusion terminal voltage recovery

Received: 12 September 2020

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TM912

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	Yan Kangwei
	Long Xinlin
	Lu Junyong
	Liu Yingquan
	Wu Yiting

Cite this article:

Yan Kangwei,Long Xinlin,Lu Junyong等. Simplified Mechanism Modeling and Discharge Characteristic Analysis of High C-Rate LiFePO₄ Battery[J]. Transactions of China Electrotechnical Society, 2022, 37(3): 599-609.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.201206 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I3/599

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