Secondary battery with a spirally-rolled electrode group

摘要

An electrode group E in which a positive electrode 1 and a negative electrode 2 are spirally-rolled interposing a separator 3 is contained in a bottomed cylindrical can 4. A metal exposure portion la provided on an end surface of the positive electrode 1 of the electrode group E or a metal-made current collecting plate 9 electrically connected to the metal exposure portion la (called a current collecting portion of a positive electrode) and a cover body 8 also functioning as a positive electrode terminal are electrically connected by a metal lead plate 5. One or more electrolyte resistant metal pressers 10 are arranged and electrically connected between the current collecting portion of the positive electrode and the cover body 8. The electrode group E is applied pressure by the cover body 8 and the bottom portion 4a of the bottomed cylindrical can 4.