Design and Current Characteristics Study of Flat Cable With Stacked 2G HTS Tapes for Superconducting Magnetic Energy Storage

The high-temperature superconducting magnetic energy storage system (HTS SMES) has the advantages of high power and fast response speed. However, the current density of a single tape is limited, making it challenging to apply in large-scale energy storage systems within the power grid. Based on existing research, this paper designed a stacked-tape in a U-shaped groove (STUG) and prepared multiple samples. Firstly, several 2G HTS tapes were stacked, then embedded in a U-shaped copper groove, and formed into a cable by soldering with eutectic Sn
$_{\text{63}}$
Pb
$_{\text{37}}$
solder. To validate the performance of this process, several samples were prepared and analyzed for their fundamental properties. The critical current of STUG (@77 K, self-field) is calculated using a self-consistent model, and is in good agreement with the experimental results. The bending radius of the STUG was tested in two bending modes, and it was found that the critical radius for inward bending of the tape is smaller than for outward bending.