| CPC H01M 50/325 (2021.01) [H01M 50/20 (2021.01); H01M 50/204 (2021.01); H01M 50/3425 (2021.01); H01M 50/375 (2021.01); H01M 2220/20 (2013.01)] | 19 Claims |
|
1. A method for venting a battery pack, the battery pack comprising an outer housing with a plurality of walls, a plurality of battery modules within the plurality of walls, and a vent system disposed in at least one of the plurality of walls, the vent system comprising a carrier plate made of a plastic or a resin, a first annular ring forming a part of the carrier plate, a valve disposed in a lumen of the first annular ring, a cover attached to the carrier plate, and a plurality of spokes extending from a wall of the first annular ring toward a central axis of the annular ring, the method comprising:
upon a temperature within the battery pack increasing above a first melting point, melting one or more of the plurality of spokes thereby enlarging a venting area of the outer housing; and then
melting portions of the carrier plate other than the plurality spokes in a later stage of one or more thermal runaway events at a second melting point different from the first melting point.
|