In terms of process:
1. There are too few positive electrical conductors (the conductivity between the materials and the material is not good, because the conductivity of the lithium cobalt itself is very poor)
2. There are too many ingredients binders. (The adhesive is generally polymer material, and the insulation performance is strong)
3. Excessive adhesive adhesive. (The adhesive is generally polymer material, and the insulation performance is strong)
4. The ingredients are not uniform.
5. Insufficient adhesive solvent during ingredients. (Can not be completely dissolved in NMP, water)
6. The density of the coating surface is too large. (Large ion migration distance)
7. The density is too large, and the roller is too solid. (The roller is too dead, and some of the active material structure is damaged)
8. Positive ear welding is not firm, and virtual welding occurs.
9. The negative ears welded or rivered, and the virtual welding occurred and welded.
10. The rolling is not tight, the rolling core is loose. (The distance between the positive and negative pole films increases)
11. The welding of the positive ears and the shell is not firm.
12. Negative pole ears and pole pillars are not welded.
13. The battery baking temperature is too high, and the diaphragm contraction. (Re shrinking the diameter of the diaphragm)
14. Excessive amount of injection (decreased conductive rate, and the internal resistance increases after the circulation!)
15. The shelving time is too short after the injection liquid, and the electrolyte is not fully infiltrated
16. Non -activated when turning.
17. Too much leakage from the process electrolyte.
18. The production process is not strictly controlled and the battery swells.
19. The battery charging voltage is set too high to cause overcharge.
20. The battery storage environment is unreasonable.
In terms of materials:
21. Positive material resistance is large. (Poor conductivity, such as lithium iron phosphate)
22. Impact of diaphragm material (thickness, small pore rate, small pore diameter)
23. Impact of electrolyte materials. (Small conductivity and large viscosity)
24. Positive PVDF materials. (There are large quantities or large molecular quantity)
25. Anti -electroconductor material effect. (Poor conductivity, high resistance)
26. Positive and negative polar ear materials effect (poor thickness and thin conductivity, uneven thickness, poor purity of materials)
27. Copper foil, poor conductivity of aluminum foil materials or oxygen on the surface.
28. The internal rivet in the cover plate is large.
29. Large resistance resistance. other aspects
30. Internal resistance test instrument deviation.
31. Human operation.