Solar container welding strength requirements

Does welding voltage affect pgrw joint strength?

The outcomes underscored that appropriate welding voltage improved the PGRW joint strength, and the joint interface was a solid-phase connection under low heat input conditions but a melting connection under high heat input conditions. However, this affected the structural integrity and electrical performance of solar cells.

What is a good tensile shear rate for a solar cell?

A consistent 45° angle between the solar cell and the interconnect foil should be guaranteed, with a shear rate maintained at 10 mm/min. For specimens from various cycling durations, ten PGRW joints were selected for tensile-shear testing, ultimately yielding the average shear force value.

Why do solar cell weld spots remain unaltered?

There is no evidence of melting or degradation at the Au Ag interface throughout the welding process, as depicted in Fig. 7 d–i. Thus, the employed PGRW current density ensures that the multilayer metal thin films in the solar cell weld spots remain unaltered, preventing any reduction in photoelectric performance of the solar cells. Fig. 7.

How thick are GaAs solar cells?

As depicted in Fig. 1 a, the GaAs solar cells employed exhibited a thickness of approximately 150 μm, which utilized Ge as a substrate and feature a 4.5 μm Ag layer and a 0.12 μm gold (Au) layer on their surface.

Why are solar cell arrays not reliable?

The complex space environments encountered by solar cell arrays during on-orbit operation can undermine their reliability. These conditions mainly include large temperature differences in operating orbits, erosion due to atomic oxygen, a significant number of irradiation particles, and radioactive radiation [4, 5].

Do solar cell joints experience thermal stresses?

Subtle shifts in grain size and orientation in the vicinity of the connection interface are inconspicuous. During thermal cycle, the solar cell joints also experience thermal stresses at the interface between the interconnects and the solar cell. However, the magnitude of these thermal stresses largely hinges on the materials utilized.