Secondary battery with film covering safety vent

摘要

A secondary battery includes a case configured to accommodate an electrode assembly, a safety vent on a first side of the case, and a film unit disposed on the first side of the case, the film unit including a first film unit covering at least a part of the safety vent, the first film unit including a break unit, and a second film unit extending from the first film unit, the second film unit being adhered to the case.

主权项

1. A secondary battery, comprising:
a case configured to accommodate an electrode assembly; a cap plate sealing the case; a safety vent in the cap plate, the safety vent being integral with the cap plate and having a thickness smaller than a thickness of the cap plate; and a film unit disposed directly on the cap plate, the film unit including:
a first film unit covering the safety vent and consisting of transparent material, the first film unit including a break line, the first film unit being detachable from the case along the break line, the break line being a punch dotted line at regular intervals penetrating and surrounding at least a part of the first film unit, a second film unit extending from the first film unit, the second film unit being adhered to the case, and an adhesive material on the second film unit, the adhesive material being on a surface of the second film unit facing the cap plate, and no adhesive material being on a surface of the first film unit facing the safety vent.