| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery capable of obtaining a stable output property even if charging and discharging with a large current are repeated. SOLUTION: In the battery of this invention, a wound electrode body 8 is housed in a closed vessel wherein a sealing plate 2 is fixed to an opening part of a battery can 1, current collectors 7, 6 are connected with an end edge on a positive electrode side and an end edge on a negative electrode side of the wound electrode body 8 respectively, the first current collector 7 located on an opening part side of the battery can 1 is connected with the sealing plate 2, and the second current collector 6 located on a bottom surface side of the battery can 1 is welded to a bottom surface of the battery can 1. The second current collector 6 has a central part 65 occupying an area where a central hole 80 of the wound electrode body 8 is projected and a ring part 66 expanding outside of the central part 65. A surface of the ring part 66 facing the bottom surface of the battery can is projection welded to the bottom surface of the battery can 1 at a plurality of parts. COPYRIGHT: (C)2005,JPO&NCIPI |
