POUCH TYPE SECONDARY BATTERY

• US 20130122336A1
• Filed: 03/27/2012
• Published: 05/16/2013
• Est. Priority Date: 11/15/2011
• Status: Active Grant

• Current Assignee: SK On Company Limited (SK Innovation Company Limited)
• Original Assignee: SK Innovation Company Limited
• Inventors: KIM, Sangbum, PARK, Heechan
• Granted Patent: US 8,679,661 B2
• Time in Patent Office: Days
• US Class Current: 429/82
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 50/3425 in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
• CPC Class Codes: H01M 50/55 on the same side of the cell
• CPC Class Codes: H01M 50/557 Plate-shaped terminals
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Provided is a pouch type secondary battery. In more detail, a pouch type secondary battery includes an electrode assembly, a pouch type battery case, a sealing part, and an exhaust part, wherein the exhaust part is formed to have adhesion weaker than that of the sealing part to release the sealing of the exhaust part when the pouch type secondary battery is swollen due to high pressure generated within the secondary battery under the conditions of overheating such as overcharging, internal short, and the like, thereby discharging materials in the pouch type secondary battery to the outside so as to secure safety of the pouch type secondary battery.

Claims

1. A pouch type secondary battery, comprising:

an electrode assembly including a first electrode and a second electrode and a first electrode tap and a second electrode tap extending from the first electrode and the second electrode;

a pouch type battery case having the electrode assembly accommodated in an inner space part thereof and sealed so that the first electrode tap and the second electrode tap are exposed to the outside;

a sealing part sealed by applying a sealing member to a bonding surface at which the pouch type battery case is bonded to each other so as to be sealed; and

an exhaust part including an exhaust member inserted into a predetermined region of the bonding surface of the sealing part and formed to have adhesion weaker than that of the sealing part.

2. The pouch type secondary battery of claim 1, wherein the exhaust member is a first exhaust member that is formed in a single layer of a film type.

3. The pouch type secondary battery of claim 2, wherein a first exhaust member is formed of modified polypropylene.

4. The pouch type secondary battery of claim 1, wherein the exhaust member is a second exhaust member that includes at least one exhaust layer and adhesive layers disposed on top and bottom portions of the exhaust layer to assist adhesion of the exhaust layer and is formed in a film type in which the exhaust layer and the adhesive layer are stacked.

5. The pouch type secondary battery of claim 4, wherein the exhaust layer is formed of nonwoven fabric and the adhesive layer is formed of polypropylene.