Patent ID: 7901809

Claim:
A secondary battery comprising: an electrode assembly having a first electrode plate, a second electrode plate and a separator; a can containing the electrode assembly and an electrolyte; and a cap assembly comprising a cap plate, an insulation plate, an electrode terminal, and a terminal plate comprising a mounting surface mounted to the insulation plate and a first side and a second side extending from the mounting surface and being adjacent each other, the cap assembly being coupled to a top opening of the can to seal the top opening, wherein the insulation plate has a terminal through-hole for passage of the electrode terminal therethrough, and wherein the insulation plate comprises a plate having lateral surfaces and a lateral end, and a lateral wall protruding from each lateral surface and the lateral end of the plate, wherein the lateral wall is absent from at least part of the plate to enclose partially one of the first or second sides of the terminal plate, and wherein the plate of the insulation plate has an area which is equal to that of the terminal plate and the terminal plate extends beyond an end of the lateral wall, and wherein the lateral wall is absent at a portion of the insulation plate where the terminal plate extends beyond the end of the lateral wall.