What are the reasons for the large internal resistance of the battery during use?

There are many reasons for the large internal resistance of lithium batteries. The reason for the large internal resistance of lithium batteries cannot be judged from a single aspect. The main reasons are the following: First of all, from the perspective of the positive electrode ingredient conductive agent, the following are important There are too few conductive agents in the positive electrode ingredients, and the conductivity between the materials is not good; too much binder in the positive electrode ingredients, which are generally polymer materials with strong insulation performance; too much binder in the negative electrode ingredients The ingredients are not evenly dispersed; the binder solvent is incomplete during the ingredients and cannot be completely dissolved in water; the surface density of coating and drawing is too large, and the ion migration distance is too large; the compaction density is too large and the roller is too compact and the roller is too dead , The structure of the active material is damaged; the positive electrode lug is not welded firmly, resulting in virtual welding; the negative electrode lug is not welded or riveted firmly, resulting in virtual welding and unsoldering; the winding is not tight, and the core is loosened, causing the gap between the positive and negative plates. The distance increases; the positive electrode lug and the shell are not welded firmly; the negative electrode lug and the pole are not welded firmly; the battery baking temperature is too high. Secondly, from the perspective of lithium battery electrolyte, the common ones are that the injection volume is too small, the conductivity decreases, the internal resistance increases after cycling, the shelf time after injection is too short, the electrolyte is not sufficiently infiltrated, and the formation is not fully activated. The electrolyte leaks too much in the process; the moisture control during the processing is not strict, and the battery swells; the battery charging voltage is set too high, causing overcharge; the battery storage environment is unreasonable and other factors. Finally, from the perspective of lithium ion battery materials, such as the high resistance of the positive electrode material, the influence of the separator material, the influence of the positive electrode PVDF material, the influence of the positive electrode conductive agent material, the influence of the positive and negative electrode tab materials, etc., there are other factors, such as internal Resistance to detection instrument deviation, human operation, environmental influences, etc. The reasons for the large internal resistance of lithium batteries are important in the above important aspects. I hope that you know that lithium batteries are helpful. It is also important to test lithium batteries. Beware of unnecessary problems during use. Trouble and loss. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What should I pay attention to to extend the service life of batteries?