Study on the Capacity Fade Detection Method for Lithium Power Battery Based on Tomographic Images

摘要

Due to the existing power lithium battery capacity fade detection methods are difficult to detect the lithium battery capacity fade in real time as the operating conditions, resulting in battery capacity fade detection error. Therefore, based on the existing detection methods, the influence of the internal structural changes of the battery on the capacity fade is considered, and a capacity fade detection method for lithium power battery based on tomography images is proposed. The quantitative relationship between the battery discharge capacity and active materials pixels of the cathode and anode electrodes is established by experimental analysis, and it illustrates that active materials pixels of the cathode and anode electrodes have a decreasing trend with decrease of the battery discharge capacity. The result shows that this method can not only detect the electrochemical performance, but also can detect the change on active materials of the cathode and anode electrodes in real time when the battery capacity fades, and the detection result is more accurate and reliable.