Contactless rechargeable secondary battery and contactless battery charger

A contactless rechargeable secondary battery, comprising:

• a secondary battery;
• a power receiver circuit provided with a power receiver coil and a resonance capacitor and adapted to receive AC power of resonance frequency via magnetic field resonance, the resonance capacitor being connected in parallel with the power receiver coil;
• a rectifier circuit adapted to rectify the AC power received by the power receiver circuit;
• a current limiter circuit adapted to limit a charging current flowing from the rectifier circuit to the secondary battery;
• and
• an outer casing configured to be cylindrical in shape, adapted to house the secondary battery, and provided with a positive terminal and a negative terminal, the positive terminal being connected with a positive pole of the secondary battery and the negative terminal being connected with a negative pole of the secondary battery, wherein the power receiver coil is shaped like a sheet by being made up of an electric wire wound along a plane and is installed along an outer surface, that extends from the negative pole to the positive pole, of the outer casing.

A contactless rechargeable secondary battery, comprising:

• a secondary battery cylindrical in shape;
• an insulating layer adapted to cover an outer surface of the secondary battery;
• a power receiver circuit provided with a power receiver coil and a resonance capacitor and adapted to receive AC power of resonance frequency via magnetic field resonance, the power receiver coil being shaped like a sheet by being made up of an electric wire wound along a plane, that extends from a negative pole to a positive pole, and the resonance capacitor being connected in parallel with the power receiver coil;
• a rectifier circuit adapted to rectify the AC power received by the power receiver circuit;
• and
• a current limiter circuit adapted to limit a charging current flowing from the rectifier circuit to the secondary battery, wherein the power receiver circuit, the rectifier circuit, and the current limiter circuit are installed between the outer surface of the secondary battery and the insulating layer.

A contactless battery charger, comprising:

• a power supply circuit adapted to output AC power of resonance frequency;
• a power transmission circuit provided with a power transmission coil and a resonance capacitor and adapted to transmit the AC power of the resonance frequency via magnetic field resonance, the resonance capacitor being connected in parallel with the power transmission coil;
• a shielding structure adapted to provide a shield to prevent external leakage of electromagnetic waves emitted from the power transmission circuit;
• a switch adapted to open and close a route of AC power supply from the power supply circuit to the power transmission circuit by engaging with the shielding structure such that the AC power is supplied from the power supply circuit to the power transmission circuit with a shield against the electromagnetic waves from the power transmission circuit being provided by the shielding structure;
• and
• a placement surface on which a contactless rechargeable secondary battery is placed in order for the power transmission coil to emit electromagnetic waves, wherein the power transmission coil is installed parallel to the placement surface, and is shaped like a sheet by being made up of an electric wire wound along a plane.