Battery cell tab cutting method, battery cell and lithium ion battery

The invention discloses a battery cell tab cutting method, a battery cell and a lithium ion battery, tabs are arranged on two opposite sides of a battery cell main body, the method comprises the following steps: calculating the total length, the total length being the sum of the theoretical tab length on two sides and the theoretical length of the battery cell main body; calculating the sum of the actual lengths of the tabs on the two sides, wherein the sum is obtained by subtracting the actual length of the battery cell main body from the total length; and cutting the tabs on the two sides based on the sum of the actual lengths of the tabs on the two sides. According to the invention, the assembly precision of the battery cell is ensured, the method is mainly applied to tab cutting and bending procedures of the large-tolerance battery cell in module production and assembly, the problem of inaccurate size of the large-tolerance battery cell in actual use is avoided, and the assembly welding reject ratio of th