Laser charging technology refers to the technology of remote and wireless charging using green laser pointer beam and photocell, which can be applied to drone life and portable electric appliance charging. The key to this technology lies in the photoelectric conversion efficiency and stability of high-intensity laser irradiation environment, because the photoelectric conversion process of laser irradiated photocells is always accompanied by heat dissipation, and the material heating and thermal stress caused by heat dissipation will pass several mechanisms. (changing the band gap of the material, shortening the carrier lifetime, etc.) reduces the photoelectric efficiency, more light energy is dissipated into heat energy, and the temperature rise/thermal stress is further aggravated. This coupling behavior may even cause the photovoltaic cell to temporarily or permanently fail.
In response to the stability and energy conversion efficiency of the green laser pointer charging system, the research team of the Institute of Mechanics of the Chinese Academy of Sciences established a coupling model from laser input to electrical energy output, developed a mathematical format for solving the energy absorption distribution, and clarified the light energy direction. The coupling mechanism of electric energy/thermal energy/strain energy conversion is constructed, and the optimal parameter window search algorithm of the system is constructed and verified by experiments.
The research was funded by the National Natural Science Foundation of China and the Chinese Academy of Sciences Class A Pilot Project. Some of the results were published in related fields [Journal of Power Sources 2018 (393) 211-216, Energy 2017 (134) 248-255, Applied Thermal Engineering 2015 (88) 410-417]. This research builds a multi-effects theoretical framework for laser charging technology and provides a high efficiency optimization algorithm for charging system design.