极片毛刺导致电池短路的检测方法

Detection method for battery short circuit caused by electrode burr

锂离子电池在制作过程中会因为多种情况导致短路。根据不同电流的充电结果,提出一种识别电池短路的方法。内部短路会导致电池出现零电压,对零电压电池进行不同的小电流充电,在电流足够小的情况下,电压将维持在一个稳定值。当电流断开后,电池会马上恢复到零电压。部分毛刺过大的电池在小电流充电下,电压保持稳定。电流增加到一定值,电压稳定上升。该方法能识别出电池制造过程中毛刺引发的短路,为极片毛刺大小识别及控制提供理论参考与方法依据。

During the production process of Li-ion battery,there were various situations that could cause short circuits.According to the results of charging the battery with different currents,a method to identify the battery short circuit was proposed.Internal short circuit could lead to zero voltage of the battery.When the current was small enough,charging the zero voltage battery with different low currents,the battery voltage would be maintained at a stability value.When the current was disconnected,the battery would immediately return to zero voltage.The voltage of part of batteries with too large burrs remained stable under low current charging.When the current was increased to a certain value,the voltage rose steadily.This method could be used to identify the battery short circuit caused by the burr in the battery manufacturing process,thus theoretical reference and method basis for the identification and control of the burr size of the electrode were provided.