Technological breakthrough and industrial application of automatic solar cell IV tester

　　1、 Equipment working principle and system composition

　　The automatic solar cell IV tester is based on a solar simulator and four wire measurement technology. It precisely controls the xenon lamp spectrum (AM1.5G standard) to irradiate the tested cell and synchronously collects the voltage current characteristic curve. The core modules include:

　　Multi channel testing unit: supports full compatibility testing of 6-inch to 12 inch battery cells, with a measurement range of 0-20V/0-15A and a resolution of 0.1mV

　　Temperature control system: PID algorithm is used to stabilize the testing environment at 25 ± 0.5 ℃, ensuring STC standard testing conditions

　　High speed motion mechanism: XYZ three-axis robotic arm positioning accuracy ± 0.02mm, combined with visual positioning to achieve a testing speed of 3600 pieces per hour. 2. Key technological innovation

　　Dynamic IV scanning technology

　　The latest generation of automatic solar cell IV tester adopts a pulse measurement mode, which completes 256 point sampling from open circuit voltage to short circuit current within 10ms, avoiding thermal accumulation errors caused by traditional steady-state testing. Actual test data shows that this technology improves the repeatability of PERC cell conversion efficiency measurement to ± 0.15%.

　　AI defect diagnosis system

　　By integrating deep neural networks, the device can automatically identify abnormal features of IV curves. When "step effect" or "reverse bias anomaly" is detected, the automatic solar cell IV tester will mark potential issues (such as hidden cracks, PID decay, etc.) and cross validate with EL detection results.

　　Digital twin calibration

　　Based on virtual calibration technology, the device periodically performs self calibration by referencing the digital model of the battery. The application of a 182mm large-sized battery cell production line shows that the system can control long-term measurement drift within ± 0.3%, far exceeding the requirements of IEC60904-1 standard. 3、 Industrial application cases

　　On the TOPCon battery production line, the automatic solar cell IV tester demonstrates significant advantages:

　　Efficiency sorting: Achieve 0.05% accuracy grading for high-efficiency battery cells with 24.5% or more

　　Process monitoring: By analyzing the fluctuation of batch IV curve Rs parameters, the pollution problem of PECVD process chamber was successfully identified

　　Quality traceability: Each battery generates an electronic ID card containing 12 parameters such as Voc/Isc/FF

　　With the development of new battery technologies such as HJT and perovskite, automatic solar cell IV testers with multi junction cell testing capabilities will become the next generation standard equipment. Its integrated solution with PL detection and appearance detection is building a quality control closed-loop system for photovoltaic intelligent manufacturing.