The internal resistance of the battery is the value of the battery in the conductive current, the current flow through the internal resistance of the battery, the parameters of the internal resistance of lithium batteries directly affect the charge and discharge performance and efficiency of lithium batteries, lithium battery internal resistance is mainly determined by the design structure of the battery, production process, and the three factors of raw materials, and by the ambient temperature, as well as the state of use conditions.
Definition of lithium battery internal resistance
Li-ion battery internal resistance is divided into ohmic internal resistance and polarization internal resistance. Ohmic internal resistance is composed of electrode material, electrolyte, diaphragm resistance and contact resistance of each part. Polarization internal resistance is the resistance caused by polarization during electrochemical reaction, including electrochemical polarization internal resistance and concentration difference polarization internal resistance. The ohmic internal resistance of the cell is determined by the total conductivity of the cell, and the polarized internal resistance of the cell is determined by the solid-phase diffusion coefficient of lithium ions in the electrode active material. The unit symbol of internal resistance of lithium battery is represented by 'Ω', and the internal resistance of lithium battery will keep getting larger with the increase of cycle times, and eventually lead to the lithium battery losing the meaning of continued use down the line. There is a very interesting question on the value of the parameters of the internal resistance of lithium batteries, the internal resistance of lithium batteries in a brand new state, the internal resistance of a single lithium cell is generally around 15-25, so if the internal resistance of lithium batteries reaches 0 will be how, which actually enters the realm of another superconductor, which is theoretically impossible to achieve the situation, if the value of the internal resistance of lithium batteries is 0 when achieved in an imaginary state, then the lithium battery instantly Empty and full of all the power.
What is the effect of the size of the internal resistance of the lithium battery on the battery?
Li-ion battery internal resistance is of course the smaller the better, only in the process and better performance of the lithium battery can be lower resistance at the factory, after the internal resistance is too large, will affect the discharge performance of the lithium battery, and too large internal resistance will directly affect the capacity of the lithium battery, because the current will be converted into heat by the impact of internal resistance, the effective discharge capacity will be reduced, and will lead to the lithium battery heat loss grant large. Affect the overall performance of the battery pack.
The effect of ambient temperature on the internal resistance of lithium batteries
The effect of temperature on the internal resistance of lithium batteries is very direct, which is the main reason why the capacity of new energy electric vehicles now disappears by one third in winter. The lower the temperature will cause the electrolyte inside the lithium battery to become sticky, thus reducing the lithium ion activity. So the lithium battery in the winter or lower temperature environment will have a loss of capacity.
Summarize;
With the expansion of the lithium battery industry, including new energy vehicles, various industries, including the discharge performance of the power lithium battery requirements are increasingly high, the lithium battery regardless of upstream monomer production and manufacturing process, or downstream lithium battery PACK production, technical capabilities have been improved by leaps and bounds, according to production experience shows that the internal resistance of the lithium battery can be made smaller in the state of multi-string and multi-parallel. And vice versa, this is also a characteristic of lithium battery PACK, lithium battery technology continues to progress, the internal resistance will be smaller and smaller with the improvement of the process, lithium batteries can also better serve various industries.
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