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摘要:
随着空间太阳电池阵从刚性半刚性电池阵向高收纳比、轻量化和低成本的柔性电池阵发展，柔性太阳电池逐渐成为未来空间能源系统的关键元件。然而，柔性太阳电池在弯曲状态下需保持光电转换效率和结构完整性，因此，对其极限弯曲半径的精确测量尤为重要。提出一种基于大挠度屈曲理论的柔性太阳电池弯曲半径测试方法，并搭建自动化测试平台。为验证该方法的准确性，将其结果与传统芯轴法进行对比。实验表明，利用大挠度屈曲法测得的极限弯曲半径与芯轴法的结果一致，证明了所提方法的准确性和可靠性，同时，该方法能够实现弯曲半径的连续可调测量，且自动化程度高。研究结果不仅为柔性太阳电池的结构设计提供了精确的力学参数，也为未来柔性电子器件的性能优化提供了参考依据。
Abstract:Flexible solar cells are becoming more widely acknowledged as essential elements for upcoming applications as space solar cell arrays move from rigid and semi-rigid structures to flexible designs with high packing ratios, less weight, and lower costs. The exact measurement of these cells’ essential bending radius is necessary because they must preserve both their structural integrity and photoelectric conversion efficiency under bending conditions. In response to this need, a new method based on large deflection buckling theory is proposed for testing the bending radius of flexible solar cells. Accurate and repeatable measurements are made possible by an automated testing instrument designed to support this method. To validate the accuracy of this method, its results were compared with those obtained using the traditional mandrel method. The accuracy and dependability of this method were confirmed by the trials, which revealed that the critical bending radius determined by the big deflection buckling method was quite compatible with that of the mandrel method. The findings of the study serve as a guide for maximizing the performance of upcoming flexible electronic devices in addition to providing exact mechanical parameters for the structural design of flexible solar cells.
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图 1 描述柔性太阳电池弯曲状态的3个参数示意图
Figure 1. Three parameters of the bending state of flexible solar cells
图 2 $ xy\theta $法测试原理及试验装置
Figure 2. Testing principle and experimental setup of thexyθ method
图 5 柔性太阳电池弯曲半径测量试验装置及原理示意图
Figure 5. Experimental setup and principle for measuring the bending radius of flexible solar cells
图 7 不同$ {\theta }_{0} $值下柔性太阳电池弯曲形状
Figure 7. Bending shapes of flexible solar cells for different $ {\theta }_{0} $ values
图 8 大挠度位移屈曲法测得的极限弯曲曲率
Figure 8. Ultimate bending curvature measured by the large deflection displacement buckling method
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