In general, one aspect disclosed features a battery system for a vehicle, the battery system comprising: multiple battery modules, wherein each battery module comprises one or more battery cells, and wherein each battery module comprises an exhaust port; and one or more structural members mechanically coupled to the multiple battery modules; wherein the one or more structural members and the multiple battery modules define an exhaust chamber; wherein the exhaust chamber is in fluid communication with the exhaust ports of the multiple battery modules; wherein the one or more structural members comprise an outlet port in fluid communication with the exhaust chamber and an exterior of the exhaust chamber.