Coolant Activated Rechargeable Energy Storage System Drain Plug

A liquid cooled battery pack apparatus comprising:

• a plurality of batteries;
• a cooling circuit comprising a containment vessel coupled with a cooling inlet and a cooling outlet and enclosing a battery housing, the battery housing enclosing the plurality of batteries and comprising a drain outlet;
• a drain plug disposed within the drain outlet comprising:
• a carrier defining a cavity therein;
• an inlet disposed on a first surface of the carrier,
• an outlet disposed on a second surface of the carrier, the first surface and the second surface fluidly displaced from one another and coupled to the cavity;
• a soluble plug disposed within the cavity of the carrier;
• an impedance element cooperative with the carrier;
• a circuit configured to detect a loss of continuity in the impedance element and provide an indication;
• a first lead and a second lead to electrically couple the impedance element to the circuit, wherein the soluble plug is configured to at least partially dissolve when fluidly coupled with a coolant allowing a portion of the coolant to flow between the battery housing and the drain outlet.