Method for improving pure copper grain boundary corrosion resistance by increasing coherent twin grain boundary proportion

The invention belongs to the field of batteries, and discloses a method for improving pure copper grain boundary corrosion resistance by increasing coherent twin grain boundary proportion, which comprises the following steps: performing repeated room-temperature multidirectional forging on pure copper, and then recrystallizing and annealing for 10 minutes at 600 DEG C to homogenize the structure of the pure copper; and the pure copper with the homogenized structure is subjected to small-deformation cold rolling, the rolling deformation is 5%, and then vacuum annealing is conducted at the temperature of 650 DEG C for 5-15 min. Pure copper is subjected to small-deformation high-temperature short-time annealing to obtain a primary recrystallization structure, although the grain boundary characteristic distribution of the primary recrystallization structure has a certain proportion of sigma 3 special grain boundaries, the proportion of coherent twin boundaries is not high, and a considerable number of non-coheren