储能科学与技术 ›› 2023, Vol. 12 ›› Issue (3): 951-959.doi: 10.19799/j.cnki.2095-4239.2022.0681

• 储能测试与评价 • 上一篇    下一篇

关于动力电池设计参数在不同倍率下的放电容量的敏感度仿真分析

蒲小雪1(), 杨少波2(), 庹爱雪1, 牟丽莎1, 那琦3   

  1. 1.重庆长安新能源汽车科技有限公司
    2.重庆长安汽车股份有限公司,重庆 401120
    3.重庆五一职业技术学院,重庆 401320
  • 收稿日期:2022-11-17 修回日期:2022-12-13 出版日期:2023-03-05 发布日期:2022-12-19
  • 通讯作者: 杨少波 E-mail:524398842@qq.com;yangsb1@changan.com.cn
  • 作者简介:蒲小雪(1989—),女,博士,工程师,研究方向为电池性能仿真,E-mail:524398842@qq.com

Simulation analysis on sensitivity of discharge capacity on design parameters of a battery

Xiaoxue PU1(), Shaobo YANG2(), Aixue TUO1, Lisha MOU1, Qi NA3   

  1. 1.Chongqing Chang'an New Energy Automobile Technology Co. , Ltd
    2.Chongqing Chang'an Automobile Technology Co. , Ltd, Chongqing 401120, China
    3.Chongqing WuYi Technician College, Chongqing 401320, China
  • Received:2022-11-17 Revised:2022-12-13 Online:2023-03-05 Published:2022-12-19
  • Contact: Shaobo YANG E-mail:524398842@qq.com;yangsb1@changan.com.cn

摘要:

本工作针对三元锂电池建立了电池电化学仿真经典的P2D模型,并通过仿真手段定量分析电池正极活性颗粒粒径、负极活性颗粒粒径、正极极片厚度、负极极片厚度、隔膜厚度对电池0.1~3 C倍率放电容量的影响,对仿真模型标定以及性能定制化开发具有重要意义。通过仿真数据可知,正极活性颗粒粒径对电压-容量曲线的影响集中在电压高于3.3 V的部分;负极活性颗粒粒径对电压-容量曲线的全电压段均有影响;正极极片厚度对电压-容量曲线的全电压段均有影响;负极极片厚度对电压-容量曲线的影响集中在电压低于3.6 V的部分;隔膜厚度对电压-容量曲线无影响。汇总分析仿真结果可知,正负极极片厚度是电池容量的正响应因素,负极粒径是电池容量的负响应因素,且均符合平方多项式关系;正极颗粒粒径和隔膜厚度对放电容量不影响。

关键词: 电池, 倍率, 仿真, 敏感度

Abstract:

This study established a classic P2D electrochemical simulation model for lithium-ion batteries. The effects of five parameters on the discharge capacity of the battery were quantitatively analyzed by simulation method, including the diameter of active particles on the cathode and anode, the thickness of the cathode and anode, and the separator thickness, which are of great significance to provide guidelines for optimizations. The simulation results showed that the diameter of active particles on the cathode could influence the tendency of capacity vs. voltage curves after the voltage is higher than 3.3 V. In contrast, the diameter of negative active particles affects the entire voltage window of the capacity vs. voltage curves. Secondly, the thickness of cathode electrode impacts the entire voltage of capacity vs. voltage curves. The thickness of the anode electrode on capacity vs. voltage curves leads to a fluctuation below the voltage of 3.6 V. According to the simulation results, only the thicknesses of cathode and anode electrodes give positive response to the battery discharge capacity. At the same time, the diameter of negative particles negatively responds to the battery discharge capacity. However, cathode particle diameter and separator thickness are insensitive to discharge capacity. Moreover, all the parameters accord with the quadratic equations.

Key words: battery, rate property, simulation, sensitivity

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