Film and Battery Pouch Comprising Same
AssigneeLG Energy Solution, Ltd.
InventorsByoungsoo Lee, Yeji Lim, Nakhee Choi
Life of this patent
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Abstract
The present disclosure can provide a film with excellent durability against an electrolyte, capable of effectively blocking the inflow of external moisture and atmosphere (air) into a battery while continuously and non-destructively discharging gas, generated inside the battery, under a low pressure condition as well as a high pressure condition. The present disclosure can provide a battery pouch capable of further improving the stability and lifespan of the battery by comprising the film in at least a portion thereof.
Claims20
A film with different gas permeability properties on both sides in order to exhaust gas generated in a secondary battery to an outside of the secondary battery and prevent external air and water vapor that is outside of the secondary battery from permeating into an inside of the secondary battery, wherein:
- the film includes a protective layer, an active layer and a support layer in that order from a side in contact with the inside of the secondary battery;
- the protective layer includes an amorphous perfluorinated polymer to have a tolerance to an electrolyte solution of the secondary battery;
- and
- under relative pressure value of 20 pound-force per square inch (psi) conditions, a ratio of a forward direction permeability of the gas generated in the secondary battery to a reverse direction permeability of air is 20 or more, where the forward direction is a direction from the inside of the secondary battery to the outside of the secondary battery, and the reverse direction is a direction from the outside of the secondary battery to the inside of the secondary battery.
Dependencies are inferred from the claim text.