I. Battery cell
1. Inspection content and mode.
(1) cell manufacturers, packaging (inner and outer packaging), appearance, size, electrical properties, weldability, grid line printing, main grid line tensile strength, uniformity of electrical properties after cutting. (Battery cells have a shelf life of one year before unpacking)
(2) random inspection (two thousandths of the incoming material), electrical properties and appearance and solderability in the production process of full inspection.
2. Inspection tools and equipment: single piece tester, vernier caliper, soldering iron, rubber, blade, tensiometer, laser scribing machine.
3. Materials needed: tin coated tape, flux.
4. Inspection methods.
1) Packaging: good, visual inspection.
2) Appearance: Meet the requirements of the purchase contract.
3) Size: measured with vernier calipers, the result conforms to the size provided by the manufacturer ± 0.5 mm
4）Electrical properties: tested with monomer tester, the result ±3%.
5) Solderability: normal soldering with a temperature of 320-350℃, and the main grid line left with a uniform solder layer after soldering is qualified. (To ensure that the experimental tin coated tape and flux with solderability)
(6) grid line printing: repeatedly rub 20 times back and forth with a rubber in the same position, does not fall off for qualified.
(7) the main grid line tensile strength: the interlocking chain will be welded into △ shape, and then tested with a tensiometer, the results are greater than 2.5N.
8）Electrical performance uniformity after cutting: Use laser scribing machine to turn the cell into several parts, test the electrical performance of each piece to keep the error at ±0.15w.
5. Inspection rules: the above contents of the full inspection, if one does not meet the inspection requirements for the batch of five thousandths of the inspection. If still does not meet the 4). 5). 7) 8) items, the batch of incoming material is judged to be unqualified.
Second, coated tin tape
1. Inspection content and manner.
(1) manufacturers, specifications, packaging, shelf life (six months), appearance, thickness uniformity, solderability, fracture rate, serpentine curvature and tensile strength.
(2) each incoming material full inspection (tray), the appearance of the production process full inspection.
2. Tools required for inspection: steel ruler, vernier caliper, soldering iron, vise, tensiometer.
3. Materials needed: battery cells, flux.
4. Inspection methods.
(1) visual inspection of the outer packaging is good, shelf life, specifications and manufacturers.
(2) appearance: visual inspection of the surface of the tin coated tape whether there are black spots, uneven tin layer, distortion and other undesirable phenomena.
(3) Thickness and specifications: check the geometric dimensions provided by the supplier, width ± 0.12mm, thickness ± 0.02mm is considered qualified.
(4) Solderability: the same as the cell inspection method
5）Fracture rate: take 10 tin-coated strips of the same length as the incoming material specifications, bend 180° in one direction, and the number of fractures shall not be less than 7 times.
(6) snake curvature: the length of the tin-coated tape pulled out 1 m close to the ruler, measuring the maximum distance from the ruler, the maximum value <3.5 mm.
5. Inspection rules: the above contents of the full inspection, if one does not meet the inspection requirements are re-inspected. If still does not meet 2). 4). 5) The content of the batch of materials is judged to be unqualified.
Third, EVA film
1. Inspection content and mode.
(1) manufacturers, specifications, packaging, shelf life (six months), appearance, thickness uniformity, peel strength and glass and backing plate, cross-linking degree.
(2) incoming sampling inspection, production process of peel strength and cross-linking degree in the sampling inspection, the appearance of the production process again full inspection.
2. Tools required for inspection: tape measure, vernier caliper, wallpaper knife, tensiometer, scissors, 120 mesh screen, cross-linkage tester, oven, electronic scale.
3. Materials needed: TPT backing, small glass, xylene, antioxidant.
4. Inspection methods.
1) Visual inspection of the package, confirm the manufacturer, specifications and shelf life.
2）Visual appearance, confirm the EVA surface without black spots, stains, wrinkles, hollows and other phenomena.
3）Measure the width ±2mm and thickness ±0.02mm according to the geometric dimensions provided by the supplier.
4）Thickness uniformity: Take 10 sheets of adhesive film of the same size and weigh them, then compare the weight of each sheet, the maximum to the minimum value shall not exceed 1.5% between.
5）Peel strength: After lamination according to the lamination parameters provided by the manufacturer, test the peel strength of EVA and glass, EVA and backing plate. (After cooling)
a. Peel strength of EVA and TPT: use a wallpaper knife to cut the width of 25px in the middle of the backing plate, and then use a tensiometer to pull apart TPT and eval, the tensile force is greater than 35N for qualified.
b. EVA and glass peel strength: the same method as above, with a tensiometer end clamped EVA, the other end fixed glass, the tension is greater than 20N for qualified.
(6) cross-linkage test: see cross-linkage test method, the test results between 70%-85% for qualified.
5. Inspection rules: the above contents of the full inspection, if one does not meet the inspection requirements are re-inspected. If still does not meet 2). 5). 6) The content of the batch is judged to be unqualified.
Fourth, the backplane
1. Inspection content and mode.
(1) manufacturers, specifications, packaging, shelf life (one year), appearance, bonding strength with EVA, bonding strength of the backplane level.
(2) incoming sample inspection, the production process of peel strength and bonding strength in the sample inspection, the appearance of the production process again full inspection.
2. Tools required for inspection: tape measure, vernier caliper, wallpaper knife, tensiometer.
3. Materials needed: EVA, small glass
4. Inspection methods.
(1) visual inspection of the package is good, to confirm the manufacturer, specifications and shelf life.
2）Visual appearance, confirm the surface of the backing without black spots, stains, no folds, hollows and other phenomena.
3）Measure the width ±2mm and thickness ±0.02mm according to the geometric dimensions provided by the supplier.
(4) Bonding strength with EVA: the same method as EVA and TPT peel strength.
5）Bonding strength of the backplane level: cut open the backplane sandwich with a razor blade, clamp one side, and test the other side with a tensiometer with a result greater than 20N.
5. Inspection rules: the above contents of the full inspection, if one does not meet the inspection requirements are re-inspected. If still does not meet the 2). 4). 5) The content of the batch of materials is judged to be unqualified
V. Tempered glass
1. Inspection content and mode.
(1) manufacturers, specifications, packaging, appearance, toughening strength, thickness and size, and EVA peeling strength.
(2) sampling inspection of incoming materials, the appearance of the whole production process again.
2. Inspection tools; tape measure, caliper, 1040g steel ball.
3. Material: EVA, backing board.
4. Inspection methods.
(1) packaging visual good, confirm the manufacturer, specifications and models.
2) Size (length * width * thickness): 1. Standard thickness of tempered glass is 3.2mm, allowable deviation 0.2mm.
2. Length and width allowable deviation 0.5mm, diagonal allowable deviation 0.7mm
3）Visual appearance.
a. Tempered glass is allowed to have a length of not more than 10mm per meter on the edge, from the glass edge to the glass plate surface extension depth of not more than 2mm, from the plate to the other side of the glass does not extend more than one-third of the thickness of the glass burst edge.
Tempered glass is not allowed to have a length of less than 1mm of concentrated bubbles inside. For lengths greater than 1mm
No stones, cracks, and missing corners are allowed to occur.
d. The number of scratches less than 0.1mm in width and less than 50mm in length per square meter is allowed on the surface of tempered glass is not more than 4. No more than 1 scratch of width 0.1-0.5mm and length less than 50mm per square meter.
e. Tempered glass is not allowed to have wave-shaped bending, bow-shaped bending is not allowed to exceed 0.2% of the side length. (The future material sampling placed on the platform, measuring the maximum distance from the table surface value)
(4) and EVA peel strength: the same test method as EVA peel strength.
(5) toughening strength: go to the incoming material six samples test, place the glass on the test stand, with a steel ball from according to the glass 1-1.2 meters, so that the steel ball falls freely on the glass, the glass does not break as qualified.
Inspection rules: the above contents of the full inspection, one does not meet the inspection requirements are re-inspected. If there is still do not meet 2). 3). 4) 5) test content, the batch is judged to be unqualified materials.
Sixth, aluminum profiles
1. Inspection content and mode.
(1) Packaging, specification size, surface hardness, oxide film thickness, profile curvature, appearance, material, and matching of profile and corner code.
(2) Sampling inspection of incoming materials and full inspection of appearance and production process.
2. Inspection tools: tape measure, vernier caliper, platform.
3. Inspection methods.
1）Package visually good, confirm the manufacturer, specifications and models.
(2) Size: width +1mm, length +1mm measured according to the geometric dimensions provided by the supplier
Allowable deviation of wall thickness ≤ 0.5mm
3) Appearance: no oxidation spots on the surface, no more than 2 scratches on the whole 0-12.5px; no more than 1 number of scratches on 0.5-25px, and no scratches larger than 25px are allowed.
(4) Profile curvature: the maximum distance from the table surface measured on the platform where the material will be placed is not more than 0.2% of the edge length is qualified.
5） Matching of profile and corner code: take a set of profiles and assemble them well, and the gap＜1mm is qualified.
6) Surface hardness (>12), oxide film (>10um) and material are provided by the supplier.
Inspection rules: The above contents are fully inspected, and if one of them does not meet the inspection requirements, the batch will be reinspected, and if there is still a failure to meet the inspection requirements of 2). 3). 5), the batch will be judged as unqualified incoming materials.
Seven, silicone
1. Inspection content and manner.
(1) manufacturers, specifications, packaging, shelf life, appearance, table drying time, elongation, and the bonding test of the backing plate.
(2) sampling inspection of incoming materials, production process tracking inspection.
Inspection tools: glue gun, stopwatch, straightedge, tensiometer.
3. Material: all kinds of backing board
4. Inspection methods.
1）Confirm the incoming material manufacturer, specifications, outer packaging, shelf life.
(2) appearance in a bright environment, the product will be squeezed into a thin strip for visual inspection, the product should be fine, uniform paste or viscous liquid, no lumps, gel, bubbles. The color is generally white or milky white, no irritating odor.
(3) table dry time will be the product with a glue gun in the experimental plate into a thin strip, immediately start timing, until touching the strip with a finger does not stain the finger, record the time used from extrusion to non-stick (10min ≤ time used ≤ 30min)
(4) elongation: in the experimental plate evenly hit a silicone, to be completely cured (record the curing time, silicone strip thickness, the original length, the length after stretching) for tensile test results ≥ 300%.
(5) bonding test: in the different backing plate each hit three silica gel, curing after observing the bonding situation with tensiometer detection, record the value. (The result is greater than 10N)
5. Inspection rules: the above contents of the full inspection, there is a failure to meet the inspection requirements are re-inspected. If there is still do not meet the 2). 3). 4). 5) test requirements, the batch is judged to be unqualified materials.
Eight, junction box
1. Inspection content and mode.
(1) manufacturers, specifications, appearance, connector tensile force, lead bayonet bite force, diode tube teaching bite force, box cover bite force, diode voltage resistance test.
(2) incoming material sampling inspection, production process tracking inspection.
2. Inspection tools: tensiometer, pressure resistance test
3. Material: tin coated tape
4. Inspection methods.
1) Confirm the junction box manufacturer, specifications and models
(2) appearance: check the appearance of defects, logo (should be non-erasable), and the number of diodes and internal defects of the junction box.
(3) connector tensile strength: the connector to the junction box, and then clip the junction box, with a tug test (pull > 10N) for qualified.
4）Lead bayonet bite force: put the sink into the bayonet, clamped with a tensiometer to apply tension > 40N for qualified.
(5) box cover bite force: three consecutive open sowing, still need special tools to open for qualified.
(6) diode withstand voltage: test with a voltage tester (1000VDC)
5. Inspection rules: the above contents of the full inspection, one does not meet the inspection requirements are re-inspected. If there is still does not meet 2). 3). 4). 5). 6) test requirements, the batch is judged to be unqualified incoming materials.