Mitigation of thermal runaway in a battery module

A motor vehicle comprising:

• a power-source configured to generate power-source torque;
• and
• a battery module configured to supply electrical energy to the power-source, the battery system including:
• a first battery cell and a neighboring second battery cell;
• a heat sink in contact with each of the first battery cell and the second battery cell and configured to absorb thermal energy from the first and second battery cells;
• a battery module enclosure surrounded by ambient environment and configured to house each of the first battery cell, the second battery cell, and the heat sink;
• and
• a heat transfer mechanism includes a first switch configured to detect temperature of the first battery cell exceeding a predetermined value indicative of a thermal runaway event and transfer thermal energy from the first battery cell to the battery module enclosure to thereby control propagation of the thermal runaway event to the second battery cell.