Power transfer apparatus, power transmission apparatus, power reception apparatus, and power transfer system

A power transfer apparatus, comprising:

• coil assembly in which a winding wire is wound a plurality of times, the coil being configured to perform a non-contact type power transfer, the coil assembly including:
• a first coil configured to perform power transmission or power reception, as the non-contact type power transfer, the first coil including:
• an out-in winding wire wound toward an inner circumference side from an outer circumference side of the first coil;
• and
• an in-out winding wire that is wound in a winding direction opposite to the out-in winding wire toward the outer circumference side from the inner circumference side of the first coil, the out-in winding wire and the in-out winding wire being stacked such that a winding position of the out-in winding wire is coincident with a winding position of the in-out winding wire;
• and
• a second coil stacked on the first coil in which power to be subjected to the power transmission is supplied at a time of the power transmission, and power to be subjected to the power reception is output at a time of the power reception;
• a heat release assembly configured to cool the coil assembly and facing a region of the coil assembly excluding a region inside from an innermost circumference of the winding wire and facing a region outside from an outermost circumference of the winding wire, in a plane parallel to a winding surface of the winding wire, the heat release assembly including:
• a plurality of metallic heat release members;
• and
• at least one gap that divides the plurality of metallic heat release members along a radial direction of the winding surface;
• a shield that is disposed on a side opposite to a power transmission side of the coil assembly at the time of power transmission or a side opposite to a power reception side of the coil assembly at the time of power reception when seen from a position of the coil assembly and the plurality of heat release assembly, and configured to shield an electromagnetic wave generated by the power transfer;
• and
• a magnetic body disposed between the shield and the heat release assembly.