Emergency fire suppression system

A fire suppression system for a battery pack, the fire suppression system comprising:

• a battery pack comprising:
• an inlet into the battery pack;
• a plurality of battery modules each housing a plurality of battery cells;
• and
• an outlet to the battery pack across from the inlet;
• a detector that senses a condition indicative of a fire event caused by a battery cell breaking down within the battery pack and produces a signal representing the condition;
• a controller, electronically connected to the detector, that determines a fire event caused by a battery cell breaking down is occurring in the battery pack based on the signal representing the sensed condition;
• an emergency entry point fluidly connected to the inlet of the battery pack and connectable to an emergency fire suppressant source, wherein 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;
• an emergency exit point mounted externally to the battery pack and fluidly connected to the battery pack such that the emergency fire suppressant drains from the battery pack through the emergency exit point;
• a collection system comprising:
• a container removably attachable to the emergency exit point to collect the drained emergency fire suppressant;
• a pump to move the drained emergency fire suppressant to the emergency fire suppressant source;
• and
• a filter upstream from the emergency fire suppressant source;
• wherein the emergency exit point is opened after the controller determines the fire event is occurring in the battery packs;
• and
• wherein the drained emergency fire suppressant moves through the container, the pump, and the filter to the emergency fire suppressant source to enter the battery pack after flowing through the emergency entry point.