基于电化学热耦合的锂电池热效应分析
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燕山大学车辆与能源学院

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Analysis of Thermal Effect of Lithium Battery Based on Electrochemical Thermal Coupling
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School of Vehicles and Energy, Yanshan University

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    摘要:

    为了研究电池在充电过程中内部热效应,本文以27Ah锂离子电池为研究对象,建立了单体电池的三维电化学-热耦合模型,并采用坐标阵列映射的方法将电芯单元的热效应扩展到单体电池。首先,考察了充电倍率对电池产热的影响规律,进而,研究了不同颗粒半径下,负极活性层中的详细产热情况,分析了颗粒尺寸对发热量的影响机制。此外还研究了自然对流下,不同充电倍率的电池温度分布情况。本文阐述了锂离子电池的发热机理,给出了电池整体温度分布特性,为优化电池结构设计,开发电池热管理系统提供了理论基础。

    Abstract:

    In order to study the internal thermal effect of the battery in the charging process, this paper takes the 27ah lithium-ion battery as the research object, establishes the three-dimensional electrochemical thermal coupling model of the single battery, and uses the coordinate array mapping method to expand the thermal effect of the cell unit to the single battery. Firstly, the influence of charging rate on the heat production of battery was investigated. Then, the detailed heat production in the negative active layer under different particle radius was studied, and the influence mechanism of particle size on the heat production was analyzed. In addition, the temperature distribution of battery with different charging rates under natural convection is also studied. This paper expounds the heating mechanism of lithium-ion battery and gives the overall temperature distribution characteristics of the battery, which provides a theoretical basis for optimizing the battery structure design and developing the battery thermal management system.

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  • 收稿日期:2022-05-31
  • 最后修改日期:2022-08-08
  • 录用日期:2022-08-15
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