In order to further improve the stability of product voltage performance, our company has added strong magnetic bars to the coating, rolling and slitting equipment in the front-end electrode production process to magnetically absorb the small amount of debris generated by the friction of the process equipment, improve the hidden dangers of the impact of magnetic substances on the battery cell voltage, and reduce the low-voltage defective rate of packaged finished products from the original 0.7% to the current 0.5%. The average self-discharge consistency of the product is better, and the operability of multi-body series and parallel connection is stronger.