Battery fire suppression system

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

• a battery pack comprising:
• an inlet to the battery pack;
• a plurality of modules within each battery pack, wherein each module houses multiple battery cells;
• and
• an outlet to the battery pack;
• a fire suppression system inlet line fluidly connected to the battery pack inlet;
• a fire suppression system outlet line fluidly connected to the battery pack outlet, wherein the outlet line of the fire suppression system fluidly connects to an exit point mounted outside of the battery pack, and wherein the exit point removably connects to a suppressant disposal container;
• a detector that senses a condition indicative of a fire event caused by at least one battery cell breaking down, wherein the detector produces a signal representing the sensed condition;
• a controller, electronically connected to the detector, that determines a fire event is occurring in the battery pack based on the signals representing the sensed condition;
• a first pressure vessel with a first vessel valve holding a first fire suppressant, the first pressure vessel fluidly connected to the battery pack inlet via the fire suppression system inlet line to flow the first fire suppressant out of the pressure vessel and into the battery pack when the controller determines a first fire event is occurring in the battery pack based on the signals and the controller opens the first vessel valve;
• and
• a second pressure vessel with a second vessel valve holding a second fire suppressant, the second pressure vessel fluidly connected to the battery pack inlet via the fire suppression system inlet line to flow the second fire suppressant out of the pressure vessel and into the battery pack when the controller determines a second fire event is occurring in the battery pack based on the signals and the controller opens the second vessel valve.