On board power device and thermal management system

A thermal management system, comprising:

• a plurality of onboard power devices, each of which comprises a power assembly comprising a plurality of electronic components, and a shell comprising an inner cavity and a coolant passage that are isolated from each other, wherein the power assembly is disposed in the inner cavity which is filled with insulating heat conductive fluid, and the power assembly is immersed in the insulating heat conductive fluid,
• wherein a power assembly of each of the plurality of onboard power devices comprises at least one of a battery module, an inverter module, an onboard charger module, and a DCDC power conversion module, and
• wherein the inner cavity of each of the plurality of onboard power devices is in fluid communication with the inner cavity of other onboard power devices to form a first cooling loop, and the insulating heat conductive fluid flows through the first cooling loop via a driving of a first pump,
• wherein the power assembly comprises an onboard charger module which comprises a main circuit board on which a transformer is provided,
• wherein a portion of the coolant passage extends toward the inner cavity, or a bottom surface of the inner cavity is planar, and
• wherein a portion of the coolant passage extends toward the inner cavity to form a transformer groove in the inner cavity, the transformer on the main circuit board being disposed in the transformer groove, a first portion of the coolant passage passing through a bottom of the transformer, and a second portion of the coolant passage passing through a side of the transformer;
• or, the transformer being directly immersed in the insulating heat conductive fluid, so that a direct contact cooling is performed through a natural convection of the insulating heat conductive fluid.