- First, causes of excessive internal resistance of lithium batteries
2. The welding between the positive electrode ear and the shell is not firm
3. negative pole lug and pole column welding is not stable
4. positive ear welding is not firm, virtual welding
5. negative electrode ear welding or riveting is not strong, virtual welding, welding
6. coating surface density design is too large (ion migration distance)
7. winding is not tight, winding core relaxation (increase the distance between positive and negative plates)
8. The solvent of the binder is not completely (not completely soluble in NMP and water)
9. the positive electrode ingredients too much binder (binder is generally polymer material, strong insulation performance)
10. negative charge binder is too much (binder is generally high polymer material, strong insulation performance)
11. lithium ion battery compaction density is too large, roll compaction. (Roller pressure over death, some of the active substance structure is damaged)
12. the positive electrode charging conductive agent is too little (the conductivity between materials is not good, because the conductivity of lithium cobalt itself is very poor)
- Second, materials
2. positive PVDF material influence. (large amount or large molecular weight)
3. positive conductive material influence. (Poor conductivity, high resistance)
4. copper foil, aluminum foil material conductivity is poor or the surface has oxide
5. diaphragm material influence (diaphragm thickness, porosity, pore size is small)
6. lithium ion battery electrolyte material influence (small conductivity, large viscosity
7. positive and negative pole ear material influence (thin conductivity poor thickness, uneven thickness, poor material purity
- Other aspects
2. Use environment of lithium ion battery
3. lithium ion battery internal resistance detection instrument deviation
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