Experimental and simulation study of direct current resistance decomposition in large size cylindrical lithium-ion battery

Understanding the contribution of internal direct current resistance (DCR) is crucial to the design and optimization of lithium-ion batteries (LIBs). However, the complex dynamic processes existing inside the battery pose great challenges to the decomposition of DCR, especially in large size cylindrical lithium-ion batteries with composite electrodes. In this paper, we achieve a comprehensive decomposition of DCR through a combination of experiments and simulations, and study the change of DCR with different discharge rates and different temperature conditions. By decoupling the internal resistance of different components and different kinetic processes inside the battery, the main limited factors of the battery in different working conditions are revealed. Our study clarifies the change of DCR with temperature and rates and provides essential guidance for the reasonable selection and design of materials in high-performance batteries.