Pouch type secondary battery with safety vent

Details Pouch type secondary battery with safety vent Pouch type secondary battery with safety vent

2006-10-17

2006-10-17

Ryan, Patrick Joseph (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Flat-type unit cell and specific unit cell components

C429S163000, C429S185000, C429S176000, C429S181000, C429S171000, C429S174000, C429S057000, C429S053000, C429S062000, C429S072000

Reexamination Certificate

active

07122276

ABSTRACT:
A pouch type secondary battery has a safety vent which prevents explosion and fire by removing a sealing mechanism of a pouch casing when the internal temperature increases due to overcharging, overdischarging or over-heating, and which exhausts internal gas before explosion and fire of the battery when the internal gas pressure excessively increases due to overcharging, overdischarging or internal short-circuit. The pouch type secondary battery includes an electrode assembly having positive and negative electrode plates with a separator interposed therebetween, and positive and negative electrode terminals extending from the positive and negative electrode plates, respectively, a pouch casing having a space in which the electrode assembly is housed to be sealed, a seal portion provided at the periphery of the space, and at least one of the positive and negative electrode terminals exposed to the seal portion, and at least one opening member disposed at the seal portion and made of a resin material having a lower melting point than a melting point of the seal portion of the pouch casing.

REFERENCES:
patent: 4678725 (1987-07-01), Kikuchi et al.
patent: 6653018 (2003-11-01), Takahashi et al.
2000-100399; Jul. 4, 2000; Japan.

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