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An impact resistant battery incorporates one or more improvements that are designed to reduce or eliminate the risk of a fire or explosion caused by a projectile impact, electrical short, or otherwise. The battery is also designed to reduce the amount of structural damage caused by a projectile impa

An impact resistant battery incorporates one or more improvements that are designed to reduce or eliminate the risk of a fire or explosion caused by a projectile impact, electrical short, or otherwise. The battery is also designed to reduce the amount of structural damage caused by a projectile impact. The battery may have a housing that includes a self-sealing ionomer material. The battery may also be filled with materials that suppress flames and/or prevent the internal temperature from reaching an ignition point.

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1. A battery comprising: a housing including a layer comprising a self-sealing ionomer material; andan electrochemical cell;wherein the housing encloses the electrochemical cell; andwherein the layer is at least 0.5 mm thick. 2. The battery of claim 1 wherein the self-sealing ionomer material includ

1. A battery comprising: a housing including a layer comprising a self-sealing ionomer material; andan electrochemical cell;wherein the housing encloses the electrochemical cell; andwherein the layer is at least 0.5 mm thick. 2. The battery of claim 1 wherein the self-sealing ionomer material includes acid groups, wherein at least some of the acid groups have been neutralized. 3. The battery of claim 2 wherein at least some of the acid groups have been neutralized with sodium and/or magnesium ions. 4. The battery of claim 1 wherein the self-sealing ionomer material includes poly(ethylene-co-methacrylic acid). 5. The battery of claim 1 wherein the self-sealing ionomer material is part of a mixture that includes a flame retardant material. 6. The battery of claim 5 wherein the flame retardant material includes decabromodiphenyl ether and/or antimony trioxide. 7. The battery of claim 1 wherein the housing includes a mixture of the self-sealing ionomer material and expanding graphite. 8. The battery of claim 1 wherein the layer is a first layer and the housing includes a second layer coupled to the first layer, and wherein the second layer forms a rigid outer shell of the housing. 9. The battery of claim 1 comprising microencapsulated wax in at least part of the space in the housing not taken up by the electrochemical cell. 10. The battery of claim 1 comprising microencapsulated carbonate salt in at least part of the space in the housing not taken up by the electrochemical cell. 11. The battery of claim 1 comprising silicone oil in at least part of the space in the housing not taken up by the electrochemical cell. 12. A battery comprising: a housing including a first layer of material coupled to a second layer of material, the material in the first layer including a self-sealing ionomer material; andan electrochemical cell;wherein the housing encloses the electrochemical cell; andwherein the first layer of material is at least 0.5 mm thick. 13. The battery of claim 12 wherein the first layer and the second layer are mechanically coupled together. 14. The battery of claim 12 wherein the first layer and the second layer are chemically coupled together. 15. The battery of claim 12 wherein the second layer includes polycarbonate, acrylonitrile butadiene styrene, and/or polypropylene. 16. The battery of claim 12 wherein the second layer includes glass fiber. 17. The battery of claim 12 wherein the second layer is on the exterior of the battery and the first layer is on the interior of the battery. 18. The battery of claim 12 wherein the material in the first layer includes poly(ethylene-co-methacrylic acid). 19. The battery of claim 12 comprising silicone oil in at least part of the space in the housing not taken up by the electrochemical cell. 20. The battery of claim 1 wherein the layer is at least 1 mm thick. 21. The battery of claim 12 wherein the first layer of material is at least 1 mm thick. 22. A battery comprising: a housing including a layer comprising a self-sealing polymer material; andan electrochemical cell;wherein the housing encloses the electrochemical cell; andwherein the layer is at least 0.5 mm thick. 23. The battery of claim 22 wherein the self-sealing polymer material includes poly(ethylene-co-methacrylic acid). 24. The battery of claim 23 wherein the poly(ethylene-co-methacrylic acid) is at least partially neutralized. 25. The battery of claim 22 wherein the self-sealing polymer material includes acid groups. 26. The battery of claim 25 wherein at least a portion of the acid groups are neutralized. 27. The battery of claim 26 wherein the acid groups are neutralized with sodium and/or magnesium ions. 28. The battery of claim 22 wherein the layer is a first layer and the housing includes a second layer coupled to the first layer, and wherein the second layer forms a rigid outer shell of the housing.