Fire shielding battery case
First Claim
1. A battery case comprising:
- a base portion having a bottom and side walls forming an interior compartment for holding a battery cell and internal structural components; and
a cover portion engaging the side walls for enclosing the compartment, wherein the base portion and cover portion are formed of a flame retardant polymeric composition comprising a base polymer and a fire resistant additive, and wherein at least one of the base portion and the cover portion includes a vent hole through which evolved gases are permitted to escape.
2 Assignments
0 Petitions
Accused Products
Abstract
A battery case made of an intumescent flame retardant polymeric composition that provides fire shielding, thermal shielding and a low heat release rate. A fire resistant additive is blended with a base polymer to produce the flame retardant polymeric material that is molded into the battery case. In one embodiment, one or more vent holes are provided in the battery case, advantageously in the cover portion, to permit gases to escape. In another embodiment, the fire resistant additive used for the battery case composition comprises a polymeric binder that includes an α-olefin-containing copolymer and a high density polyethylene, a nitrogenous gas-generating agent; a water vapor-generating agent; an antioxidant; and optionally a reinforcing agent. In another embodiment, the base polymer comprises a polyphenylene oxide and polypropylene blend, unfilled or filled with up to 60 wt. % glass fiber.
71 Citations
37 Claims
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1. A battery case comprising:
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a base portion having a bottom and side walls forming an interior compartment for holding a battery cell and internal structural components; and
a cover portion engaging the side walls for enclosing the compartment, wherein the base portion and cover portion are formed of a flame retardant polymeric composition comprising a base polymer and a fire resistant additive, and wherein at least one of the base portion and the cover portion includes a vent hole through which evolved gases are permitted to escape. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A battery case comprising:
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a base portion having a bottom and side walls forming an interior compartment for holding a battery cell and internal structural components; and
a cover portion engaging the side walls for enclosing the compartment, wherein the base portion and cover portion are formed of a flame retardant polymeric composition comprising a base polymer and a fire resistant additive, wherein the fire resistant additive comprises, on the basis of 100 parts by weight blended mixture;
20-45 parts of a polymeric binder comprising high density polyethylene having a density in the range of 0.940-0.970 g/cm3 and an α
-olefin-containing copolymer having a density less than the density of the high density polyethylene;
5-25 parts of a nitrogenous gas-generating agent selected from the group consisting of amines, ureas, guanidines, guanamines, s-triazines, amino acids, salts thereof, and mixtures thereof, wherein the salts are selected from the group consisting of phosphates, phosphonates, phosphinates, borates, cyanurates, sulfates and mixtures thereof;
10-35 parts of a water vapor-generating agent;
1-5 parts of an antioxidant; and
0-15 parts of a reinforcing agent, wherein the flame retardant polymeric composition is essentially halogen-free. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A battery case comprising:
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a base portion having a bottom and side walls forming an interior compartment for holding a battery cell and internal structural components; and
a cover portion engaging the side walls for enclosing the compartment, wherein the base portion and cover portion are formed of a flame retardant polymeric composition comprising a base polymer and a fire resistant additive, wherein the base polymer comprises polyphenylene oxide, polypropylene, and 0-60 wt. % glass fiber. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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Specification