Yu Hanqing, Yang Long, Zhang Lisheng, Li Junfu, Liu Xinhua
School of Automotive Engineering, Harbin Institute of Technology, Weihai, Shandong, China.
School of Transportation Science and Engineering, Beihang University, Beijing, China.
iScience. 2022 Apr 11;25(5):104243. doi: 10.1016/j.isci.2022.104243. eCollection 2022 May 20.
With the aggravation of environmental pollution and energy crisis, lithium-ion batteries are widely regarded as promising. However, the current distribution in the parallel battery pack branches is highly heterogeneous. Charging strategies based on the models can be adopted to prevent side reactions that may lead to severe degradation or even thermal runaway under various ambient temperatures. In this study, a battery model for a single cell is established by coupling a single particle model with electrolyte, degradation model, and thermal model. Besides, considering the contact resistance and wire resistance, the circuit model of a battery pack is established. A charging strategy based on minimum Li plating overpotential control is then adopted, and the effectiveness under high C-rate and low temperature to reduce capacity loss is verified by simulation. This study provides a low-loss charging strategy that can reduce the safety risk of battery packs with better performance under various ambient temperatures.
随着环境污染和能源危机的加剧，锂离子电池被广泛认为具有广阔前景。然而，当前并联电池组支路中的电流分布高度不均。基于这些模型的充电策略可用于防止在各种环境温度下可能导致严重性能退化甚至热失控的副反应。在本研究中，通过将单粒子模型与电解质模型、退化模型和热模型相耦合，建立了单节电池的模型。此外，考虑到接触电阻和线路电阻，建立了电池组的电路模型。随后采用基于最小锂金属化过电位控制的充电策略，并通过仿真验证了在高充电倍率和低温下降低容量损失的有效性。本研究提供了一种低损耗充电策略，该策略能够降低电池组的安全风险，并在各种环境温度下具有更好的性能。
