NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–CCTV Tester
Question: Why do you need to test the internal resistance of the battery? Answer: 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 reflected. At the same time, with the increase of the deterioration degree of the battery, the internal problem of the battery: Why should the internal resistance test of the battery be carried out? Answer: As the capacity state of the battery decreases, the internal resistance of the battery decreases. resistance will increase. The larger the capacity of the battery, the smaller the internal resistance reflected. 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 is closely related to its capacity: the increase of the internal resistance of the battery is an important sign of the deterioration of the battery performance. Although measuring the floating charge voltage and making adjustments in time is an important task in the daily maintenance of the battery, measuring the floating charge voltage cannot find out the backward single cells. Using a multimeter to measure the float voltage of each cell in this group of batteries is quite average, but after discharging for a while, the terminal voltage of one of the cells quickly drops below the cut-off voltage, which is obviously a backward cell.
To accurately know the health of VRLA batteries, only capacity tests are performed on the batteries. Although the check capacity discharge test can measure the capacity of the battery 100%, this test method has many drawbacks, such as high cost, heavy equipment and training of special personnel, etc. The most important thing is that this test must remove the battery from the equipment. Isolation for a considerable period of time, and during this time, if there is no battery as a backup power source, the danger is obvious.
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