锂离子电池充电状态估计技术是电动汽车电池管理系统设计的重要组成部分.准确的荷电状态估计可以防止锂离子电池过度充电和放电,从而提高放电效率和延长循环寿命.本文总结了锂离子电池SOC估计的关键技术.首先,介绍了锂离子电池建模的研究现状.其次,讨论了锂离子电池模型参数辨识的主要技术和难点.再次,总结了SOC估计方法的发展现状和优缺点.最后,对当前研究存在的问题和发展趋势进行了总结展望.“,”The technology deployed for lithium-ion battery state of charge (SOC) estimation is an important part of the design of electric vehicle battery management systems. Accurate SOC estimation can forestall excessive charging and discharging of lithium-ion batteries, thereby improving discharge efficiency and extending cycle life. In this study, the key lithium-ion battery SOC estimation technologies are summarized. First, the research status of lithium-ion battery modeling is introduced. Second, the main technologies and difficulties in model parameter identification for lithium-ion batteries are discussed. Third, the development status and advantages and disadvantages of SOC estimation methods are summarized. Finally, the current research problems and prospects for development trends are summarized.