Energy Storage Science and Technology ›› 2021, Vol. 10 ›› Issue (3): 1153-1162.doi: 10.19799/j.cnki.2095-4239.2021.0009

• Energy Storage Test: Methods and Evaluation • Previous Articles     Next Articles

Analysis of heat production of nickel-rich lithium-ion battery based on electrochemical thermal coupling model

Kuining LI1,2(), Yuncheng XIE1,2, Yi XIE3, Qinghua BAI1,2, Jintao ZHENG3   

  1. 1.Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University
    2.School of Energy and Power Engineering, Chongqing University
    3.School of Automotive Engineering, Chongqing University, Chongqing 400044, China
  • Received:2021-01-06 Revised:2021-01-18 Online:2021-05-05 Published:2021-04-30
  • Contact: Kuining LI E-mail:leekn@cqu.edu.cn

Abstract:

The thermal effect of lithium-ion battery on the working process will affect its temperature and electrochemical performance and its safety and service life. For the design of battery thermal management systems, the change rule of thermal characteristics and heat generation mechanism of batteries in the process of discharge must be analyzed and the interaction of different properties of heat generation inside the battery under the temperature change be evaluated. Therefore, in this paper, an electrochemical thermal coupling model based on dynamic parameter response is established for nickel-rich ternary lithium-ion battery. The 0.3 and 1 C discharge and temperature rise experiments are conducted at 0°C and 40°C, respectively. The verification results showed that the coupling model has good accuracy and reliability and can accurately analyze the thermal characteristics of the battery. Based on the verified model, the temperature rise characteristics of Ni-rich Li-ion batteries under different discharge rates, ambient temperatures, and heat exchange environments are studied, and the internal heat generation mechanism and heating characteristics of the battery are further analyzed. The results revealed that the total heat production of the battery increases rapidly with the increase in the discharge rate, and the internal temperature inhomogeneity of the battery is aggravated. The large difference of the entropy heat coefficient between the positive and negative electrodes increases the heat production of the positive-electrode region and makes that of the negative electrode gentler. The research results can provide guidance for the thermal performance evaluation of lithium-ion battery and the design of the thermal management system of battery packs.

Key words: lithium ion battery, nickel rich lithium ternary, electrochemical thermal coupling, temperature rise characteristics, heat production analysis

CLC Number: