| 摘要 |
PROBLEM TO BE SOLVED: To suppress the smoking or firing even when an internal short-circuit is caused in charged state by forming a clearance between the inner surface of a battery can and the outside of a pole plate group so as to substantially extend over the whole surface, and arranging a rib in the clearance as occasion demands. SOLUTION: A positive electrode 1 and a negative electrode 2 are arranged opposite to each other through a separator 3, and wound in roll to constitute a rolled group (pole plate group), which is then housed in a battery can (Ni plated iron can) 5, an electrolyte is put therein, and the battery can is sealed by a sealing body. A clearance is formed between the inside surface of the Ni-plated iron can 5 and the outside surface of the rolled group so as to substantially extend over the whole surface. A rib is preferably provided between the battery can inside surface and the rolled group outside surface to fix the wound group to some degree. The negative electrode 2 is produced by uniformly applying a slurry of amorphous carbon capable of doping and dedoping lithium and polyvinylidene fluoride dispersed which are dispersed in N-methyl-2- pyrolidone to both surfaces of a current collector, and drying it followed by compression molding. |
