空间太阳电池封装体中气泡的研究与消除

Investigation and Elimination of Air Bubbles in the Bonding Assemblies of Space Solar Cells

研究气泡对空间太阳电池封装体的影响以及如何抑制气泡的生成。通过气液固三相体耦合分析研究了气泡形成后在粘合剂(非牛顿流体)中的运动变化过程,通过静态应力分析研究了空间环境中气泡的膨胀现象,并结合试验定性地分析了气泡的生成原理。从中推导出了气泡边界运动的控制方程,仿真得到了气泡的边界运动变化曲线和内部压强,计算出了含气泡的封装体局部的应力分布情况,并提出了抑制气泡生成的若干种方法。计算结果表明:气泡可引起封装体局部应力集中、使粘接面容易分离、使固化胶和玻璃盖片接近强度极限等。而试验表明:按照所提出的抑制气泡的方法进行操作,能有效抑制气泡的生成,减小/减少气泡的尺寸与数量。

This paper investigates the influences of air bubbles on bonding assemblies of space solar cells and how to suppress the formation of air bubbles. The motion ＆ variation process of a bubble in the non-Newtonian fluidic adhesive was studied through gas-liq-uid-solid three phases coupling analysis, the bubble＇s expansion phenomenon in outer space environment was addressed through static stress analysis, and the principle of bubble creation was analyzed qualitatively combined with experiments. We derived motion governing equations of bubble＇ s boundary, obtained motion curve of bubble＇ s boundary as well as inner pressure of a bubble via simulation, computed stress distribution of an assembly at the local area around a bubble, and proposed several approaches to suppress bubble formation. Results show that a bubble could induce stress concentration on local areas of an assembly and separation of two adhesion surfaces and enlarge the stress of solidified adhesive as well as cover glass to approach ultimate strength. It is experimentally shown that the proposed approaches could effectively reduce the dimension and number of air bubbles.