Patent ID: 9553285
Date: 2017-01-24
CPC Classifications: H01M,Y02E,Y10T

Claim:
1. A battery reinforcement method for reinforcing a rectangular battery cell in which a battery element is disposed in a rectangular external packaging, the method comprising: enclosing the battery element between two rectangular external packaging sheets and sealing the rectangular external packaging sheets with a sealing part that extends around an entire circumference of the battery element so as to form the rectangular external packaging, the rectangular external packaging having at least four sides, each of the sides having an edge, the sealing part being separated from the edges of at least three of the sides such that the sealing part is disposed between the battery element and the edges of the at least three sides of the rectangular external packaging; forming a reinforcing part on at least one of the at least three sides of the rectangular external packaging such that an elongated gap exists between the sealing part and the reinforcing part, the reinforcing part being located in a region between the sealing part and the edge of the at least one of the at least three sides of the rectangular external packaging from which the sealing part is separated, the gap extending parallel to the edge of the at least one of the at least three sides such that the reinforcing part is separated from the sealing part by the gap and does not overlap the sealing part; forming each of the two rectangular external packaging sheets by coating a metal sheet with a resin; and forming the sealing part and reinforcing part independently from each other by thermocompression-bonding the resin that coats the two external packaging sheets.