Reasons for excessive internal resistance of lithium batteries

(1) There is too little conductive agent in the positive electrode ingredient (the conductivity between the material and the material is not good, because the conductivity of lithium cobalt itself is very poor) (2) There is too much binder in the positive electrode ingredient (binders are generally polymer materials) , The insulation performance is strong) (3) Too much binder in the negative electrode ingredients (binders are generally polymer materials with strong insulation performance) (4) The ingredients are unevenly dispersed (5) The binder solvent is incomplete during the ingredients (Not completely soluble in NMP and water) (6) The surface density of coating drawing is too large (the ion migration distance is large) (7) The compaction density of the lithium battery is too large, and the roller is too compact. (Rolling is too dead, and some of the active material structure is destroyed) (8) The positive lug is not welded firmly, and there is a virtual weld (9) The negative lug is not welded or riveted, and the negative electrode is welded or riveted. (10) Unwinding Tight, loose core (increasing the distance between the positive and negative plates) (11) The positive electrode lug and the shell are not welded firmly (12) The negative electrode lug and the pole post are not welded firmly. 2. Material aspects (1) The resistance of the positive electrode material Large (poor conductivity, such as lithium iron phosphate) (2) The influence of diaphragm material (diaphragm thickness, small porosity, small pore size) (3) The influence of lithium battery electrolyte material (small conductivity, high viscosity) (4) Positive PVDF Material influence. (The amount is large or the molecular weight is large) (5) The influence of the positive electrode conductive agent material. (Poor conductivity, high resistance) (6) Influence of positive and negative electrode lug materials (thin thickness, poor conductivity, uneven thickness, poor material purity) (7) Copper foil, aluminum foil material has poor conductivity or oxides on the surface 3. Other aspects (1) Lithium battery internal resistance detection instrument deviation (2) Human operation (3) Lithium battery use environmental statement: Some pictures and content of the articles published on this site are from the Internet, if there is any infringement, please contact to delete the previous article: Analysis of electric vehicle lithium Battery failure repair