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 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 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;
• 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.