Systems and methods for supplying power in a hybrid vehicle using capacitors, a battery and one or more DC/DC converters

A power management system for a hybrid vehicle including an engine, comprising:

• a battery;
• a vehicle power bus that distributes power from the battery to vehicle loads;
• a capacitor, wherein the capacitor includes one of a plurality of supercapacitors and a plurality of ultracapacitors;
• a starter/generator controller that communicates with the capacitor and the battery;
• a power management module configured to:
• supply power from the capacitor to the starter/generator controller during cranking of the engine;
• and
• supply power from the battery to the starter/generator controller during the cranking of the engine,
• wherein the power supplied by the battery is greater than or equal to 2% and less than or equal to 20% of a total power supplied to the starter/generator controller during the cranking of the engine;
• and
• a battery and capacitor assembly including:
• a cooling plate assembly;
• a heat spreader;
• zoned thermoelectric devices;
• and
• mounting brackets,
• wherein the battery includes pouch-type battery cells and the capacitor includes pouch-type capacitor cells, and
• wherein the pouch-type battery cells and the pouch-type capacitor cells are arranged between the mounting brackets and in thermal contact with the heat spreader and the zoned thermoelectric devices.