Separators having improved temperature ranges for battery shutdown
View Patent ↗Battery separators are presented having improved temperature ranges for battery shutdown. The battery separators include a first layer having a first shutdown temperature range, a second layer having a second shutdown temperature range, and a third layer having a third shutdown temperature range. The first shutdown temperature range and the second shutdown temperature range have a first overlap in temperature. The second shutdown temperature range and third shutdown temperature range have a second overlap in temperature. In some embodiments, the second layer is disposed between the first layer and the third layer to create a sandwiched structure.
1. A battery separator, comprising:
a first layer having a first shutdown temperature range wherein the first layer comprises at least one of polyethylene, polypropylene, and polyvinyl chloride;
a second layer having a second shutdown temperature range wherein the second layer comprises at least one of polymethyl methacrylate, polybutylene terephthalate, and poly ethylene terephthalate; and
a third layer having a third shutdown temperature range;
wherein the first shutdown temperature range and second shutdown temperature range have a first overlap in temperature of at least 30° C.; and
wherein the second shutdown temperature range and third shutdown temperature range have a second overlap in temperature of at least 30° C.
2. The battery separator of claim 1 , wherein the first shutdown temperature range and third shutdown temperature range do not overlap.
3. The battery separator of claim 1 , further comprising a ceramic layer.
4. The battery separator of claim 3 , wherein the ceramic layer has a melting temperature above 600° C.
5. A battery separator, comprising:
a first layer having a first shutdown temperature range wherein the first layer comprises at least one of polyethylene, polypropylene, and polyvinyl chloride;
a second layer having a second shutdown temperature range wherein the second layer comprises at least one of polymethyl methacrylate, polybutylene terephthalate, and poly ethylene terephthalate;
a third layer having a third shutdown temperature range; and
wherein the second layer is disposed between the first layer and third layer to create a sandwiched structure;
wherein the first shutdown temperature range and second shutdown temperature range have a first overlap in temperature of at least 30° C.; and
wherein the second shutdown temperature range and third shutdown temperature range have a second overlap in temperature of at least 30° C.
6. The battery separator of claim 5 , wherein the first shutdown temperature range and third shutdown temperature range do not overlap.
7. The battery separator of claim 5 , wherein the first shutdown temperature range spans 80-250° C.
8. The battery separator of claim 5 , further comprising a ceramic layer.
9. The battery separator of claim 8 , wherein the ceramic layer has a melting temperature above 600° C.
10. A battery separator, comprising:
a first layer having a first shutdown temperature range of 80-250° C. wherein the first layer comprises at least one of polyethylene, polypropylene, and polyvinyl chloride;
a second layer having a second shutdown temperature range of 150-300° C. wherein the second layer comprises at least one of polymethyl methacrylate, polybutylene terephthalate, and poly ethylene terephthalate; and
a third layer having a third shutdown temperature range of 250-450° C.
11. A battery comprising:
a cathode;
an anode; and
a separator according to claim 1 disposed between the cathode and the anode.
12. A battery comprising:
a cathode;
an anode; and
a separator according to claim 5 disposed between the cathode and the anode.
13. A battery comprising:
a cathode;
an anode; and
a separator according to claim 10 disposed between the cathode and the anode.