Energy Storage Science and Technology ›› 2017, Vol. 6 ›› Issue (5): 1076-1083.doi: 10.12028/j.issn.2095-4239.2017.0059

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Research progress of energy storage composite flywheel

WANG Chao1, DAI Xingjian2, WANG Yong2, LI Xi1, ZHONG Guobin1   

  1. 1Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, Guangdong, China; 2Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  • Received:2017-05-16 Revised:2017-06-26 Online:2017-09-01 Published:2017-09-01

Abstract: The technical characteristics, application fields and key technologies of flywheel energy storage system were reviewed briefly, in which the mechanical and structural design of composite flywheel was the fundamental study for improving energy density. In particular analysis, both theoretical analysis and finite element calculation provided stress and strain information of composite flywheel at rated speed, and the ultimate speed was determined according to strength criterion. Some operations, such as multi-rings interference fitting, commingled fiber reinforced structures, multidirectional fiber alignment, winded and woven plies, were selected to enhance the energy density, making full use of the design feasibility of composite to adapt to the stress features in rotating condition. The energy capacity of composite flywheel had increased from 0.3—5 kW•h to 30—130 kW•h, and the energy density had realized 30~100 W•h/kg correspondingly. As contrast, alloy steel flywheel cost 700 $/kW•h and the cost of composite material in flywheel estimated at 3000 $/kW•h. Therefore, the low performance-price ratio restricted composite flywheels from large-scale applications.

Key words: flywheel energy storage, composite, structural design, mechanics research