【作者】 杨乃兴； 岳泓亚； 郑建校； 付永红； 王娟； 杨厂； 许世维；

【Author】 Yang Naixing;Yue Hongya;Zheng Jianxiao;Fu Yonghong;Wang Juan;Yang Chang;Xu Shiwei;Shaanxi Key Laboratory of Nano-materials and technology,School of mechanical and electrical engineering,Xi’an University of Architecture and Technology;Chongqing Changan New Energy Vehicles Technology Company Limited;Shandong Green New Energy Company Limited;

【机构】 西安建筑科技大学机电工程学院陕西省纳米材料与技术重点实验室； 重庆长安新能源汽车科技有限公司； 山东高佳新能源有限公司；

【摘要】 建立准确、简单的锂离子电池发热率预测方法是提高其热性能仿真精度需要解决的关键问题之一,对电动汽车动力电池组的热管理设计具有重要意义。本文建立了锂离子电池发热率计算方法的通用方程,给出了电池欧姆电阻实验拟合公式的一般形式,并基于电池单颗粒Li扩散方程的两参数近似形式建立了电池极化内阻的计算公式;利用建立的电池发热率方程,构建了锂离子电池热仿真简化模型,分别采用简化模型和机理模型对锂离子电池放电过程进行了数值模拟,并与实验数据进行了对比,结果表明:锂离子电池热仿真简化模型在保持较高计算精度的情况下可显著降低数值仿真的时间(其计算时间不足机理模型的1/5);最后,利用建立的电池发热率计算方程对16串1并的电池组建立了热模型,并对其放电过程中的热性能进行了数值仿真,结果显示该模型可较好地考虑动力锂离子电池组放电过程中的不平衡放电和不均匀温度分布问题。更多还原

【Abstract】 A simple and precise prediction method of the battery heat generation rate is vital to improve the simulation accuracy of the thermal characteristics of lithium-ion battery packs,which is significant to design the thermal management system of the powering battery pack in electric vehicles.In this work,a generalized and simple equation is developed to calculate the heat generation rate of the battery on the basis of the semi-empirical estimation algorithm.A common form of fitting formula is proposed to estimate the ohmic resistance of the lithiun-ion battery,and a general formula is derived for the polarization resistance based on a two-parameter approximate model of lithium diffusion process.Then,a simplified thermal model is developed for the lithium-ion battery using the proposed battery calorific equations.The temperature and voltage of a prismatic lithium-ion battery are simulated and measured during the discharging process.The results show that the battery temperatures simulated by the proposed model are good agreement with the experimental data.Compared with the theoretically based model,the proposed model decreases calculation speed by more than 4.0 times at the same conditions.Finally,the temperature of the battery pack(16 S1 P) is simulated by a thermal model with using the proposed calorific equations.The results show that the unbalanced discharge phenomenon and uneven temperature distribution are well considered in the proposed model.更多还原