A fire suppression system includes a detector, a controller, and an emergency entry point. The battery pack includes an inlet, a plurality of battery modules housing battery cells, and an outlet. The detector senses a condition indicative of a fire event caused by a battery cell breaking down and produces a signal representing the condition. The controller is electronically connected to the detector. The controller determines a fire event is occurring in the battery pack based on the signal representing the sensed condition. The emergency entry point is fluidly connected to the battery pack inlet. The emergency entry point is connectable to an emergency fire suppressant source. The emergency fire suppressant flows through the emergency entry point and through the battery pack when the emergency fire suppressant source is connected to the emergency entry point.