Battery housing for a lithium-ion battery

A battery housing configured to contain a traction battery within an engine compartment of a hybrid vehicle, the battery housing comprising:

• a metal shell;
• and
• solid thermal insulation configured to envelop the traction battery and spaced from the metal shell and the traction battery to define first and second slots, respectively, wherein at least one of the first and second slots is configured for connection to external airflow, and wherein the battery housing further comprises braces between the metal shell and the solid thermal insulation.

A battery assembly comprising:

• a traction battery disposed within a battery housing configured to contain the traction battery, the battery housing having a structural shell with solid thermal insulation spaced from the structural shell and spaced from the traction battery to define first and second slots, respectively, and a third slot enveloped by the second slot.