What effect does the internal resistance of a lithium battery have on the battery?

The internal resistance of the battery is the resistance that the battery receives when the current flows inside the battery when the battery is conducting current. The parameters of the internal resistance of the lithium battery directly affect the charging and discharging performance and efficiency of the lithium battery. The internal resistance of the lithium battery is mainly determined by the design of the battery. The structure, production process, and raw materials are determined by three factors, and are affected by the environmental temperature and the state of use conditions. Definition of the internal resistance of lithium batteries The internal resistance of lithium batteries is divided into ohmic internal resistance and polarization internal resistance. The ohmic internal resistance is composed of electrode material, electrolyte, diaphragm resistance and the contact resistance of each part. Polarization internal resistance refers to the resistance caused by polarization during electrochemical reaction, including electrochemical polarization internal resistance and concentration polarization internal resistance. The ohmic internal resistance of the battery is determined by the total conductivity of the battery, and the polarization internal resistance of the battery is determined by the solid phase diffusion coefficient of lithium ions in the electrode active material. The unit symbol of the internal resistance of the lithium battery is represented by'Ω'. The internal resistance of the lithium battery will continue to increase with the increase of the number of cycles, and eventually cause the lithium battery to lose the meaning of continuing to be used offline. There is a very interesting problem in the parameter value of the internal resistance of the lithium battery. When the internal resistance of the lithium battery is in a brand new state, the internal resistance of the single lithium battery is generally about 15-25, then if the internal resistance of the lithium battery reaches What happens to 0? This actually enters the category of another superconductor. In theory, this is impossible to achieve. If the internal resistance of the lithium battery is 0 under the illusion state, the lithium battery will be emptied and fully charged in an instant. What effect does the internal resistance of a lithium battery have on the battery? The internal resistance of lithium batteries is of course as small as possible. Only lithium batteries with better technology and performance can achieve lower internal resistance when leaving the factory. If the internal resistance is too large, it will affect the discharge performance of the lithium battery and become too large. The internal resistance of the lithium battery will directly affect the capacity of the lithium battery, because the current will be converted into heat by the internal resistance, the effective discharge capacity will be reduced, and will lead to a large heat loss of the lithium battery. Affect the overall performance of the battery pack. The influence of ambient temperature on the internal resistance of lithium batteries The influence of temperature on the internal resistance of lithium batteries is very direct. This is the main reason why new energy electric vehicles now lose one-third of their capacity in winter. The lower the temperature will cause the internal electrolyte of the lithium battery to become viscous, thereby reducing the lithium ion activity. Therefore, the capacity of lithium batteries may be lost in winter or in a low temperature environment. Summary: With the expansion of the lithium battery industry, all walks of life, including new energy vehicles, have higher and higher requirements for the discharge performance of power lithium batteries. Regardless of the upstream monomer production and manufacturing process, or the downstream lithium battery PACK production, Technical capabilities have been greatly improved. According to production experience, the internal resistance of lithium batteries with multiple strings and multiple parallel states can be made smaller. The reverse is also true. This is also a characteristic of lithium battery PACK. With the continuous advancement of lithium battery technology, the internal resistance will become smaller and smaller as the process improves, and lithium batteries can better serve various industries. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Lithium battery PACK factory explains the matters needing attention when assembling lithium batteries