Battery cell and battery

• Main Authors: YUAN HAOCHENG, ZOU HU, HE ZHIJIA, ZHU XIUZHEN, ZHANG JIAYU
• Format: Patent
• Language: Chinese; English
• Published: 14.03.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The utility model provides a battery cell and a battery. The battery cell comprises a first pole piece and a second pole piece which are formed by winding, the first pole piece comprises a first current collector, a first active layer and a first tab, and the first current collector comprises a first extension section which is bent for the first time from a winding starting end; the second pole piece comprises a second current collector and a second tab; and the second current collector comprises a second extension section which is bent for the first time from the winding starting end. When the first current collector is bent, the first extension section is not provided with the first active layer, so that short circuit caused by falling of the first active layer can be avoided; the first tab is positioned on the first current collector outside the first extension section, so that the transmission path of current can be shortened, the impedance of the battery cell is reduced, and the charging efficiency is im