Several factors affecting the internal resistance of the battery

Factors affecting the internal resistance of the battery. Battery life: With the increase in use time, the formation capacity of the battery decreases due to factors such as electrolyte loss, corrosion of the electrode plate and connecting belt, vulcanization of the electrode plate, deformation of the electrode plate, and active material shedding. , The internal resistance of the battery increases. The amount of charge of the battery: Because of the depth of the electrolyte injected into the battery, the thickness of the electrode surface material, the porosity of the electrode surface, etc., the internal resistance of different batteries is very large, and the amount of charge varies greatly. Temperature: A change in ambient temperature, such as an increase in temperature, will cause the reverberant material to diffuse faster, making charge transfer, electrode dynamics, and material transportation easier, thereby reducing the internal resistance of the battery. Otherwise, it will be added. Battery model: Different manufacturers, different models, and different types of batteries have different internal resistances due to different electrode, electrolyte, gap material formulations, different battery structures, and different assembly processes. Measuring signal frequency: At present, many battery internal resistance measurements actually measure the impedance of the battery, including capacitive reactance, as well as the size of the capacitive reactance and the measurement signal frequency, making the battery internal resistance measurement result unobjective. There is objectivity, it should be connected according to the signal current and voltage measurement, and the battery capacitance measurement result should be removed from the analysis method, so the measurement result and the measurement signal frequency are irrelevant, that is to say, in the frequency of any measurement signal, there is a unique internal The resistance measurement result. Measurement time and current economics: Regarding high current measurement, the moment of measuring the signal and turning off the measurement signal are supplementary, because the establishment and stability of polarization is a process of change, different currents, different measurement times, and different polarizations , Make the battery internal resistance measurement result not objective. To be objective, the internal resistance should be measured with a small signal current as much as possible. According to the test, the measured current is less than or equal to 0.05c10, (where C10 is the capacity of the battery at a 10-hour discharge rate). The effect of excessive charging: In the state of overcharge, the positive electrode is reacted by water due to the evolution of oxygen, and h+ is added, resulting in the accelerated corrosion of the grid near the positive electrode, and the sparse grid accelerates the corrosion of the battery. Causes a decrease in battery capacity. At the same time, due to increased water loss, the battery is in danger of drying out, which in turn affects the service life of the battery. The influence of excessive discharge: The overdischarge of the battery mainly occurs after the AC power failure, and the battery supplies power to the load for a long time. When the battery is over-discharged to a voltage that is too low or even zero, a large amount of lead sulfate in the battery will be adsorbed on the surface of the battery's cathode, and sulfate radicals will be formed in the battery's cathode. Lead sulfate is a kind of insulator, its formation has a great negative impact on the battery's charge and discharge function, so the more sulfate forms the cathode, the greater the battery's internal resistance, the worse the battery's charge and discharge function, and the shorter the battery's service life. . 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: How to maintain lithium batteries effectively and reasonably?