Wireless power transfer technology has emerged as a new class of prospective components for electric vehicle charging. However, conventional wireless power transfer systems often suffer from unsatisfactory charging efficiency due to the comparatively longer recharge range and insufficient universality for various car models. Here, we present a stretchable wireless power transfer (SWPT) system that consists of thin and stretchable inductive coupling coils designed in serpentine shapes to provide stretchablility for the charging of any model. The receiving coil is adhered to the vehicle roof, and the transmitting coil hung over the vehicle is used to adjust the transmission distance. In order to improve the capability of coils, the design of windings is optimized to enhance stretchability and decrease the resistance via fabricating treble strand serpentine copper traces. The results show that the charging efficiencies of the SWPT remain stable even though the coils are under bending and stretching. As an application demonstration, the SWPT system is installed on the roofs of two different model cars, respectively, and the results demonstrate that the charging efficiencies remain stable. Thus, this work paves a novel way to develop a stretchable, convenient, universal, and high-performance wireless power transfer system.

中文翻译：

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用于电动汽车充电的薄、可拉伸、通用无线电力传输系统

无线电力传输技术已成为电动汽车充电的一类新的潜在组件。然而，传统的无线电力传输系统由于充电距离相对较长且对各种车型的通用性不足，常常存在充电效率不理想的问题。在这里，我们展示了一种可拉伸的无线电力传输 (SWPT) 系统，该系统由设计成蛇形形状的薄且可拉伸的电感耦合线圈组成，可为任何模型的充电提供可拉伸性。接收线圈贴在车顶上，发射线圈悬挂在车辆上方，用于调整传输距离。为了提高线圈的性能，优化了绕组的设计，以增强可拉伸性并降低电阻过孔制造高音股蛇形铜迹线。结果表明，即使线圈处于弯曲和拉伸状态，SWPT的充电效率仍保持稳定。作为应用演示，SWPT系统分别安装在两款不同车型的车顶上，结果表明充电效率保持稳定。因此，这项工作为开发可拉伸、方便、通用和高性能的无线电力传输系统铺平了新的道路。