晶体硅太阳电池应力的理论分析

Theoretical Analysis of Stresses for Crystalline Cells in PV Modules

光伏组件的电池层为一离散分布的不连续夹层.针对组件中晶体硅电池片的受力特点导出了电池片的应力场和位移场,并对面板尺寸为1580 mm×808 mm的单晶硅标准组件在风荷载作用下晶体硅电池片的应力进行了计算和分析,考虑了风压及EVA胶膜的剪切模量变化对应力的影响.计算结果与有限元结果进行了比较,并对比了125 mm×125 mm和156 mm×156 mm两种规格电池片的应力.结果表明,理论结果与有限元结果符合很好,应力最大值出现在电池片的中点并随着EVA胶膜剪切模量的增加呈非线性增大;增大电池片的尺寸将引起应力的显著增加.

In photovoltaic(PV)modules,the solar cells are separated by small gaps and the stress distribution in cells is thus different from that where the cell layer is considered as a continuous one.In this paper,the solutions of the stress and displacement fields in the crystalline solar cells were developed.The stresses of the crystalline solar cells in PV module with a size of 1580 mm×808 mm were evaluated and the variation of the wind pressure and the effects of the storage shear modulus of the Ethylene-Vinyl Acetate(EVA)were considered.The results by the present solution were compared with those from Finite Element(FE),and the stresses of 125 mm×125 mm and 156 mm×156 mm cells were compared.The comparison shows that the results by present solution are in good agreement with those from the FE.The maximum stress(Von Mises stress)occurs at the middle of the cell and increases nonlinearly with an increase of the storage shear modulus of EVA.The results also show that the stress rises when the larger cells are applied.