The testing standards for photovoltaic cell voltage and current bending testing machines (which may refer to comprehensive testing equipment that can perform IV curve testing and bending testing, although these two types of testing are usually completed using different equipment or systems) mainly involve mechanical and electrical performance evaluation of photovoltaic cells. The following is a detailed explanation of the testing standards for these two aspects:
1、 Mechanical Performance Evaluation: Bending Test Standards
Purpose of the test:
Simulate the stress situation under actual working conditions and evaluate the bending resistance and mechanical strength of photovoltaic cells.
Experimental equipment:
Electronic universal testing machine.
Four point bending fixture.
Small protective cover (used to prevent fragments from splashing around after the sample bends and breaks).
Experimental conditions:
Sample: Photovoltaic cells, of standard size and without obvious defects or damage.
Temperature: Room temperature.
Test speed: usually 5mm/min to ensure stability and accuracy of the test.
Experimental Procedure:
Place the photovoltaic cell sample on the support points of the four point bending fixture to ensure even contact between the sample and the fixture.
Adjust the fixture to ensure that the sample is in the appropriate position and angle.
Install small protective covers around the sample.
Set the test parameters and start the electronic universal testing machine for bending test.
Monitor the deformation of the sample during the testing process and record the test data.
Analysis of experimental results:
Analyze the mechanical properties of photovoltaic cell samples based on test results, including bending strength, fracture toughness, and other indicators.
Evaluate the quality and performance of the samples based on experimental results, providing reference for further optimization of design and production.
Following standards:
Usually following relevant international standards such as IEC61215 and IEC61646.
2、 Electrical performance evaluation: IV curve testing standard
Test purpose:
Evaluate the electrical performance of photovoltaic cells, including key parameters such as open circuit voltage (Voc), short-circuit current (Isc), maximum power point (Pmax), and corresponding voltage (Vmp) and current (Imp).
Test equipment:
Light source simulator (used to simulate solar radiation).
Electronic load (used to change the operating voltage of battery cells and measure current).
Data collection system (used for recording and analyzing data).
Test conditions:
Light intensity: usually controlled within a certain range, such as 1000W/m ².
Temperature: Maintain near the standard test temperature, such as 25 ℃.
Test environment: unobstructed and pollution-free.
Test steps:
Clean the surface of photovoltaic cells and remove obstructions such as dust and dirt.
Check if the battery cell connection wires are intact to ensure the stability and safety of the circuit.
Connect the tested photovoltaic cells correctly to the testing equipment.
Set the initial conditions for the electronic load and start the light source simulator.
Gradually change the working conditions of the electronic load and record the current value corresponding to each voltage point.
Use a data acquisition system to record all voltage points and corresponding current values.
Test result analysis:
Import the recorded data into the analysis software and draw the IV curve.
Read key parameters from the IV curve and calculate the conversion efficiency of the battery cell.
Evaluate the performance status of photovoltaic cells based on the IV curve shape and performance parameters.
Following standards:
Usually following industry testing standards and specifications.
In summary, the testing standards for photovoltaic voltage and current bending testing machines cover two aspects: mechanical performance evaluation and electrical performance evaluation. In practical applications, it is necessary to select appropriate testing equipment and methods based on specific requirements and testing purposes, and strictly follow relevant standards and specifications for operation and analysis.