Causes of excessive internal resistance of lithium batteries

　　Author ：Iflowpower – Portable Power Station Supplier

(1) The positive electrode binding conductive agent is too small (the conductivity between the material and the material is not good, because the conductivity of the lithium cobalt itself is very poorly conductive) (2) Too much of the positive electrode binder (the binder is generally a polymer material) , Strong insulation performance) (3) Excessive negative ingredient binder (binder is generally high molecular material, strong insulation performance) (4) The binder solvent is not complete when the ingredient dispersion is not average (5) (Can not completely dissolve in NMP, water) (6) The density of the coated pulp is too large (the ion migration distance is large) (7) lithium ion battery compact density is too large, and the roll is too real. (The roller pressure is dead, the active material structure has been destroyed) (8) The positive ears welding is not strong, the virtual welding (9) negative ear welding or riveting is not strong, there is no soldering, debroad welding (10) wound Tighten, the core relaxation (the distance between the positive and negative poles) (11) The positive end and the housing welding are not strong (12) negative electrode ears and pole welding are not priority, material (1) positive electrode material resistance Big (poor conductivity, such as lithium iron phosphate) (2) diaphragm material effect (diaphragm thickness, small porosity, pore size) (3) lithium ion battery electrolyte material effect (small conductivity, high viscosity) (4) positive electrode PVDF material. (Quantity or molecular weight) (5) influence of positive electrode conductive agent materials.

(Paralleled electrical conductivity, high resistance) affects the influence of positive and negative polar ears (poor thickness, uneven thickness, pure material purity) (7) copper foil, aluminum foil material conductivity difference or surface has an oxygen three, other aspects (1) Lithium-ion battery internal obstruction instrument deviation (2) Artificial operation (3) Lithium ion battery usage environment.