A rechargeable AA battery supporting Qi wireless charging
Alexey A. Dmitriev, Egor D. Demeshko, Danil A. Chernomorov, Andrei A. Mineev, Oleg I. Burmistrov, Sergey S. Ermakov, Alina D. Rozenblit, Pavel S. Seregin, Nikita A. Olekhno

TL;DR
This paper introduces a rechargeable AA battery that supports Qi wireless charging, enabling convenient, universal wireless power transfer for standard-sized batteries in consumer electronics.
Contribution
It presents a novel design of a rechargeable AA battery with integrated Qi wireless charging capability, using a series resonant circuit and load modulation for compatibility.
Findings
Successful experimental demonstration of wireless charging at various distances and angles.
Numerical simulations validate magnetic field distribution and coupling efficiency.
The battery supports Qi charging protocol with practical performance metrics.
Abstract
Wireless power transfer is one of the key drivers in modern consumer electronics, as it allows one to enhance the convenience and usability of many devices. However, in most cases, wireless charging is accessible only to devices with incorporated receivers or at least to gadgets with standard charging connectors, such as USB Type-C, that allow to attach an external receiver. We propose a rechargeable battery that has the size and output voltage of a standard AA battery but supports wireless power transfer from charging stations of the widely used Qi standard. The proposed design uses a series resonant circuit with a curved receiving coil, as well as load modulation using detuning capacitors switched by a microcontroller unit to implement a receiver compatible with the Qi Baseline protocol. It also utilizes a number of DC-DC converters to store energy in a Li-ion cell and convert it to…
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Taxonomy
TopicsWireless Power Transfer Systems · Energy Harvesting in Wireless Networks · Advanced Battery Technologies Research
