Abstract: A solar cell module includes a number of solar cell panels and a number of connecting elements connecting to the solar cell panels. The solar cell panels are collapsibly connected by the connecting elements. Due to the collapsible function, a volume of the solar cell module can be reduced, thereby simplifying transport of the solar cell module.

Abstract: An exemplary solar battery device includes plural photovoltaic cells detachably connected together. Each photovoltaic cell includes a base and a chip unit supported by the base. The chip unit includes a first electrode at a bottom thereof and a second electrode at a top thereof. The base includes first electrical terminals and second electrical terminals, which are respectively connected with the first and second electrodes of the chip unit. The photovoltaic cells are electrically connected with each other in a selected one of the following arrangements: connection in series, connection in parallel, and connection in both series and parallel, via corresponding ones of the first and second electrical terminals.

Abstract: A system for measuring a focal length of an optical lens includes an image processing device and an operating platform. The image processing device is configured for capturing a light spot image of the optical lens. The operating platform includes a mount, a holder and a measurer. The mount is configured for mounting the image processing device. The holder is configured for holding the optical lens. The mount is moved back and forth along the direction towards and away from the optical lens held by the holder. The measurer is configured for measuring and recording a distance between image processing device and the optical lens when a minimal light spot image of the optical lens is obtained. The distance is the focal length of the optical lens.

Abstract: A system for evaluating light uniformity through an optical lens includes an operating platform, an image processing device and a processor. The operating platform includes a mount and a holder. The mount is configured for mounting the image processing device. The holder is configured for holding the optical lens. The image processing device is configured for capturing an image of a light spot corresponding to the optical lens. The processor is electrically coupled to the image processing device. The mount is shifted back and forth along the direction towards and away from the holder for adjusting the size of the light spot of the optical lens. The processor is configured for calculating the light uniformity through the optical lens according to a minimal light spot image from the image processing device.