Ev multi-mode thermal management system

A multi-mode vehicle thermal management system is provided that allows efficient thermal communication between a refrigerant-based thermal control loop (501), which may be operated in either a heating mode or a cooling mode, and multiple non-refrigerant-based thermal control loops like battery (509) control loop (505), passenger cabin control loop 503) and drive train control loop (507) . As a result of this approach, the system is able to efficiently regulate the temperature within the various vehicle thermal control loops, for example utilizing the heat generated within one subsystem (501) to heat another subsystem (503,505). A valve assembly (563) connects or separates battery loop (505) and drive train loop (507).