Multi-coating structure, negative pole piece and application of negative pole piece

• Main Authors: XIONG HOUGAO, ZHU ZHONGSI, TAN MINGSHENG, HAN SUIWU, LIU JINCHENG, LI QIANWEI
• Format: Patent
• Language: Chinese; English
• Published: 13.07.2021
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a multi-coating structure, a negative pole piece and application of the negative pole piece. The multi-coating structure comprises a current collector, the current collector is divided into at least one pole piece area along the width direction, and two active areas are arranged in the pole piece area at intervals along the width direction of the current collector. The surface of each active area is provided with an active slurry layer, an area between the active area and the long edge of the pole piece area is a tab empty foil area, an edge coating area is arranged between the active areas. The surface of the edge coating area is provided with an edge coating slurry layer, and the adhesive force of the edge coating slurry layer is greater than that of the active slurry layer. According to the invention, the problem of powder falling during tab cutting and welding can be effectively avoided, the voltage drop of a battery cell is normal, the yield of the battery cell is increased, the ca