【摘要】 锂离子电池析锂反应易引发电池内短路，造成热失控等安全事故。现有针对电池析锂反应的检测方法大多属于事后分析法，无法满足析锂在线检测的需求。为此，本文提出了一种基于电化学阻抗测量的锂离子电池析锂反应在线检测方法。首先，基于等效电路模型解析电池析锂反应过程。其次，设计电池阻抗在线测量装置，实时获取电池10 Hz特征激励频率下的电化学阻抗。最后，提出并验证了基于电化学阻抗特征的锂离子电池析锂检测方法。结果表明：电池电化学阻抗随温度和充电倍率的升高而降低：低温工况下，电化学阻抗出现加速衰减特征时，电池开始发生析锂。更多还原

【Abstract】 Lithium-ion battery lithium plating reaction is easy to trigger the short circuit in the battery, resulting in thermal runaway and other safety accidents. Most of the existing detection methods for lithium plating reaction in batteries belong to the post-mortem analysis method, which can not meet the needs of lithium plating online monitoring. This paper designs an on-line lithium plating detection method for lithium-ion batteries based on electrochemical impedance measurement.Firstly, the equivalent circuit model is used to analyse the lithium plating reaction process of the battery, which provides a theoretical basis for the detection of lithium plating based on battery impedance. Secondly, an online measurement device of battery impedance is designed to obtain the electrochemical impedance of the battery at the characteristic excitation frequency of 10 Hz in real time, and an online detection method of lithium plating in lithium-ion batteries based on electrochemical impedance characteristics is proposed and verified. The results show that lithium plating occurs when the electrochemical impedance of the battery shows an accelerated decay under low-temperature operating conditions.更多还原