Rechargeable battery having safety device within

摘要

A rechargeable battery improving safety by discharging a gas when swelling occurs. The rechargeable battery includes an electrode assembly having a first electrode plate and a second electrode plate arranged at opposite sides of a separator, a pouch to accommodate the electrode assembly, the pouch having a plurality of inner sides, a first tab connected to the first electrode plate and a second tab connected to the second electrode plate, the first tab and the second tab extending to an outside of the pouch and a safety device arranged within the pouch and including a bonding member bonded to one of the inner sides of the pouch, a fin member including a tip facing and being spaced-apart from one of the inner sides of the pouch, and a linking member connecting the fin member to the bonding member.

主权项

1. A rechargeable battery, comprising:
a pouch enclosing a first space and a plurality of second spaces, the pouch having an upper wall, a lower wall opposite the upper wall and a plurality of side portions connecting the lower wall to the upper wall; an electrode assembly arranged within the first space within the pouch, the electrode assembly having a first electrode plate and a second electrode plate arranged at opposite sides of a separator; an electrolyte solution arranged within the pouch; a first tab connected to the first electrode plate and a second tab connected to the second electrode plate, the first tab and the second tab extending to an outside of the pouch and extending between adjoining ones of the second spaces within the pouch; and a safety device arranged within one of the second spaces within the pouch while being external to the electrode assembly, the safety device including a bonding member bonded to an inner side of one of the upper and lower walls of the pouch, a fin member including a sharp tip facing and being spaced-apart from an inner side of one of the side portions of the pouch, and a link member connecting the fin member to the bonding member, the safety device to move the sharp tip of the fin member towards the one of the side portions of the pouch to perforate a hole in the pouch upon a buildup of internal pressure within the pouch, wherein the bonding member includes a first bonding member bonded to an inner side of the lower wall of the pouch and a second bonding member bonded to an inner side of the upper wall of the pouch, the first and second bonding members being spaced apart from each other in a thickness direction of the electrode assembly; and wherein the link member includes a first and a second link member attached to a first end of the fin member, the sharp tip being arranged on a second and opposite end of the fin member, the fin member extending in a direction that is orthogonal to the thickness direction of the electrode assembly, the sharp tip being spaced apart from the one of the side portions of the pouch by a gap, the sharp tip moving towards and perforating a hole in the one of the side portions of the pouch upon a buildup in internal pressure within the pouch.