In terms of technology:

1. The positive electrode ingredient has too little conductive agent (the conductivity between materials is not good because the conductivity of lithium cobalt itself is very poor)

2. There is too much adhesive for the positive electrode ingredient. (Adhesives are generally polymer materials with strong insulation properties)

3. Excessive adhesive for negative electrode ingredients. (Adhesives are generally polymer materials with strong insulation properties)

4. Uneven distribution of ingredients.

5. Incomplete binder solvent during ingredient preparation. (Not completely soluble in NMP, water)

6. The density design of the coating slurry surface is too high. (Long ion migration distance)

7. The compaction density is too high, and the rolling is too compacted. (Excessive rolling may cause damage to the structure of active substances)

8. The positive electrode tab is not firmly welded, resulting in virtual welding.

9. The negative electrode ear is not firmly welded or riveted, resulting in false soldering or detachment.

10. The winding is not tight and the core is loose. (Increase the distance between positive and negative electrode plates)

11. The positive electrode ear is not firmly welded to the housing.

12. The negative electrode ear and pole are not firmly welded.

13. If the baking temperature of the battery is too high, the diaphragm will shrink. (Reduced diaphragm aperture)

14. Insufficient liquid injection amount (conductivity decreases, internal resistance increases quickly after circulation!)

15. The storage time after liquid injection is too short, and the electrolyte is not fully soaked

16. Not fully activated during formation.

17. Excessive leakage of electrolyte during the formation process.

18. Insufficient water control during the production process, resulting in battery expansion.

19. The battery charging voltage is set too high, causing overcharging.

20. Unreasonable battery storage environment.

In terms of materials:

21. The positive electrode material has high resistance. (Poor conductivity, such as lithium iron phosphate)

22. Impact of battery separator material (separator thickness, small porosity, small pore size)

23. Effects of battery electrolyte materials. (Low conductivity, high viscosity) 2

24. Positive electrode PVDF material influence. (high in weight or molecular weight)

25. The influence of positive electrode conductive material. (Poor conductivity, high resistance)

26. Effects of positive and negative electrode tab materials (thin thickness, poor conductivity, uneven thickness, and poor material purity)

27. Copper foil and aluminum foil materials have poor conductivity or surface oxides.

28. The riveting contact internal resistance of the cover plate pole is too high.

29. The negative electrode material has high resistance.

30. Deviation of internal resistance testing instruments.