Patent ID: 8039134

Claim:
A can type secondary battery, comprising: an electrode assembly; a can housing the electrode assembly, the can having an opening at one end thereof; and a cap assembly in the opening of the can, the cap assembly comprising: a cap up electrically connected to the electrode assembly, a circuit board between the cap up and the electrode assembly, the circuit board comprising a plurality of woven fiber layers, each of the woven fiber layers having a woven direction which is inclined with respect to a length direction of the circuit board, resin layers formed between, on a first side of, and on a second side of the plurality of woven fiber layers, wherein the resin layer between the woven fiber layers is thicker than the resin layers on the first side and on the second side of the woven fiber layers; and a circuit pattern on one of the resin layers, wherein the circuit board is configured to be fractured by a safety vent; a safety vent between the circuit board and the electrode assembly, the safety vent being deformable by an internal pressure of the secondary battery to break the circuit board, and an insulation gasket to insulate the cap up, the circuit board, and the safety vent from the can.