Flexible liquid metal coil prepared for electromagnetic energy harvesting and wireless charging

doi:10.1007/s11708-019-0632-0

Front. Energy

2019, Vol. 13

Issue (3) : 474-482 https://doi.org/10.1007/s11708-019-0632-0

RESEARCH ARTICLE

Flexible liquid metal coil prepared for electromagnetic energy harvesting and wireless charging

Shen GUO¹, Peng WANG¹, Jichuan ZHANG¹, Wenpeng LUAN¹, Zishuo XIA², Lingxiao CAO², Zhizhu HE²(

)

¹. China Electric Power Research Institute, Beijing 100192, China
². Vehicle Engineering, College of Engineering, China Agricultural University, Beijing 100083, China; Tianjin Microfluidic Technology Co., Ltd., Tianjin 300457, China

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Abstract

This paper reported a study on a flexible liquid metal coil (LMC) for electromagnetic collection from the transmission line for self-powered sensor and electromagnetic generation for wireless charging of cellular telephone. The room temperature liquid metal of Galinstan was perfused to elastic silicone tube, which is then terminated with gallium-plated copper wire. The as-prepared liquid metal wire can sustain stretching, twisting, and bending with large deformation, and has a good electrical contact stability with the external circuit. The LMC based magnetic energy harvester was then designed and demonstrated to collect the magnetic field energy induced by a wire carrying alternating current. The power of 260 mW was obtained for the wire carrying current of 10 A. The flexible toroidal inductor was fabricated and tested for magnetic energy harvesting. The flexible spiral-shaped LMC was also designed and demonstrated to power cellular telephone through wireless charging. The present study opens the way for further applications of elastic LMC in electromagnetic energy harvesting and charging.

Keywords liquid metal Galinstan flexible coil electromagnetic energy harvesting wireless charging

Corresponding Author(s): Zhizhu HE

Online First Date: 06 June 2019 Issue Date: 04 September 2019

Cite this article:

Shen GUO,Peng WANG,Jichuan ZHANG, et al. Flexible liquid metal coil prepared for electromagnetic energy harvesting and wireless charging[J]. Front. Energy, 2019, 13(3): 474-482.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-019-0632-0
https://academic.hep.com.cn/fie/EN/Y2019/V13/I3/474

Fig.1 Preparation process of liquid metal wire

Fig.2 Impact of deformation of LM wire with a length of 100 mm on its electric resistance

Fig.3 Impact of deformation of LMC with 10-circles and total length of 130 cm on its electric resistance (Different deformations are shown in (a)–(f) and the corresponding electric resistances are presented in (g))

Fig.4 Electromagnetic energy harvester based on LMC

Fig.5 LMC output voltages with different electronic loads

Fig.6 Output power with different load and current of primary wire

Fig.7 Flexible magnetic core

Fig.8 Annular flexible magnetic core around with LMC

Fig.9 LMC output voltages with different electronic loads

Fig.10 Wireless charging to cellular telephone based on LMC

Fig.11 High frequency alternating current input to spiral LMC and charging capacity

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