| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium-ion secondary battery capable of suppressing the internal resistance to a lower level. SOLUTION: The lithium-ion secondary battery has winding parts, with a positive-terminal plate and a negative-terminal plate wound via a separator. The end in the non-coating area 1 of a positive-terminal bonding agent is protruded in the upper portion of the winding parts, and the end in the non-coating area of the negative-terminal bonding agent is protruded in the lower portion of the winding parts. A power-collecting disk 7 is disposed facing both ends of the winding parts, and the materials are identical to used as those of a positive and a negative power collectors. The end in the non-coating area 1 of the positive-terminal bonding agent is bonded in the positive-terminal side, with a plurality of joints to the side of the winding parts in the power-collecting disk 7, and the end in the non-coating area of the negative-terminal bonding agent is bonded in the negative-terminal side, with a plurality of joints at the side of the winding parts in the power-collecting disk 7. Parts of the joints constitute wide joints 25 gradually widening from the bonding end with the non-coating area 1 of the positive-terminal bonding agent to the power-collecting disk 7. Volume is increased in the joints 25. COPYRIGHT: (C)2009,JPO&INPIT |
