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The necessity of battery internal resistance test

time:2020/7/11   source:华天电力  reading:319 time

The internal resistance is currently recognized as the most effective and most convenient performance parameter for the battery. It can reflect the performance indicators such as the deterioration degree and capacity status of the battery, and these indicators are not reflected by the operating parameters such as voltage, current, temperature, etc. The four main failure modes of the battery: (the direct effects of water loss, negative plate vulcanization, positive plate corrosion and thermal runaway cause the capacity of the battery to decrease and the internal resistance to increase) are the main reasons for the increase in the internal resistance of the battery.


Battery Internal Resistance Tester.png


As the capacity state of the battery decreases, the internal resistance of the battery will increase. The larger the capacity of the battery, the smaller the internal resistance. At the same time, as the deterioration of the battery increases, the internal resistance of the battery will also increase significantly. Therefore, the internal resistance of the battery has a close relationship with its capacity: the internal resistance of the battery Increase is an important sign of battery performance degradation.


The research results of the International Telecommunications Power Annual Meeting show that if the internal resistance of the battery exceeds 25% of the normal value, the capacity has been reduced to about 80% of its nominal capacity; if the internal resistance of the battery exceeds 50% of the normal value, the battery capacity has Reduced to below 80% of its nominal capacity, it needs to be replaced in time.


The batteries are used in series at most sites. The performance status of the single battery directly affects the performance status of the battery pack. At the same time, the lagging batteries in the battery pack will accelerate the degradation rate of other batteries connected in series. Therefore, the monitoring of the single battery is a necessary condition to ensure the capacity status and service life of the battery pack. By performing the internal resistance test on the single battery in the battery pack, it is possible to accurately grasp the performance of each single battery in the battery pack Performance status. At the same time, it is of great significance to ensure the stable power supply of the battery and extend the service life of the battery pack.


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