I. Main Performance and Technical Indicators of IV Equipment
1.1 The IV test occupies less than 160ms of ct time.
1.2 Light source type: Arc pulse xenon lamp, 2,000,000/3,000000 (Warranty/Features);

1.3 Effective spot area: 240mm*240mm;
1.4. Irradiance range: 200-1200W/ ㎡;
1.5 Spectral range: 300-1200nm;
1.6 Light source matching degree: 0.875 to 1.125A+;
1.7 Irradiance non-uniformity :≤1% (irradiance area 220mm*220mm);
1.8 Irradiance instability :≤0.5%;
1.9 GRR Capability: ≤10% (Uoc, Isc, FF, Eta)
Sample selection rule: Based on the distribution of efficiency ranges, select 10 efficiency range battery cells, totaling 10 cells
solar cell,totaling 10 cells.
Test requirement: Repeat the test of the selected samples six times.
1.10 Static test stability Eta: < 0.02%
Calculation formula: For the same battery cell, test once every 2 seconds and conduct static tests 20 times to calculate the range of Eta.
1.11 Dynamic test stability Eta: ≤0.05%
Calculation formula: 10 cells, repeat the test 3 times, calculate the range of each cell and then take the average.
1.12. Temperature probe accuracy: < ±0.1°;
1.13. Voltage range: 1V, 5V, 10V, 30V;
1.14. Current range: 0.1A,15A,25A,40A;
1.15. Pulse width: 10-100ms at 1000W/㎡ irradiance, adjustable step by step every 1ms.
1.16. The IV test time is less than 160ms (the bright field pulse width is less than 60ms);
1.17. IV characteristic parameters (including bright field & dark field) : Isc, Uoc, FF, Eta, Rs, Rsh, Pmax, Irev, Jsc, Impp, Vmpp, Pmpp, etc.
1.18. Load testing technology: Four-quadrant electronic load, dual-scan measurement technology, effectively eliminating capacitance effect, precisely measuring Perc, Topcon, IBC, heterojunction and other batteries;
1.19. Reference battery temperature control method: Use water cooling for independent control to keep the temperature at 25±1°.
Ii. Main Performance and Technical Indicators of EL Equipment
2.1 The EL test occupies less than 80ms of ct time.
2.2 Test compatible battery cell size :230mm*230mm;
2.3 Camera type/pixel (CCD) : ≥5 million (brand: Hikvision)
2.4 Resolution: ≤200μm;
2.5 EL detection accuracy rate: ≥97.8%;
2.6 Image uniformity test: > 95%;
2.7 Defect repeatability: 100%;
2.8. Handling of EL Defective Data: For the classification of EL defective data, a hot spot map should be created to facilitate the display of the frequency and concentration of occurrence. The gray value of EL should be able to display numerical values to avoid the appearance of light and dark patches at the component end.
Definition of key technical indicators: a: Accuracy rate =1- [(false judgment + missed judgment)/Test quantity] *100%
Misjudgment refers to the situation where the defective interception battery cells, after manual determination, contain Class A battery cells that do not meet the defective standards
Missed detection refers to the situation where A battery cell that meets the Class A standard contains abnormal battery cells that exceed the Class A standard
b: Image uniformity: It refers to the uneven imaging within a single cell of a solar cell, except for the influence of its own EL defects, caused by no equipment.
Calculation formula: Image uniformity =1-(the number of non-uniform images in the sample/the number of samples)*100%
c: Defect repeatability test: It refers to the repeated testing of the same batch of battery cells twice, and the defects of the same battery cells remain consistent
Calculation formula: Repeatability =1-(number of defect differences/number of test samples)*100%