Wirelessly charged AA battery with a curved receiving coil

Wireless power transfer is one of key drivers in modern consumer electronics, as it allows enhancing the convenience and usability of many devices. However, in most cases wireless charging is accessible only to devices developed with such a functionality in mind or at least to gadgets with standard charging connectors, such as USB type-C. We propose the design of a rechargeable battery having the size and output voltage characteristics of a standard AA battery, but supporting magnetic wireless power transfer from charging stations of widely used Qi standard. In our numerical simulations, we study the magnetic field distributions and scattering parameters of the introduced battery with a curved receiving coil coupled to a planar transmitting coil. The obtained results are supported by an experimental realization of the proposed design and a study of the prototype characteristics. The developed battery design facilitates the possibility of adding wireless charging functionality to a wide range of electronic devices in a universal way.