Thermal barrier assemblies for traction battery packs

Thermal barrier assemblies are provided for traction battery packs. An exemplary thermal barrier assembly may be configured to block or even prevent thermal energy associated with a battery thermal event from moving from cell-to-cell, compartment-to-compartment, and/or cell stack-to-cell stack within the traction battery pack. The thermal barrier assembly may include features such as a protective housing and a thermal insulating barrier provided within the protection housing. The protecting housing may be made of a metallic, ceramic, or polymeric material, for example. The thermal insulating barrier may include an aerogel, a foam, or an inorganic paper, for example.