A. Virtual welding between the negative electrode piece and the pole lug;

B. Weld the positive electrode piece with the pole lug;

C. The positive lug and the cap are partially welded;

D. The negative lug is welded to the shell;

E. High internal resistance in contact between rivet and platen;

F. No conductive agent is added to the positive electrode;

G. Electrolyte does not have lithium salt;

H. The battery has been short-circuited;

I. Small porosity of diaphragm paper