Author ：Iflowpower – Portable Power Station Supplier
UPS battery internal resistance test can extend battery pack life. Professional UPS battery maintenance personnel know that if the battery is deteriorated, only the obvious voltage abnormality can only be displayed in the later stage of the damage. Therefore, although the base station and the UPS battery of the base station and the computer room are all installed online voltage monitoring systems, only online monitoring voltage is not enough, periodically detecting battery internal resistance to discover deteriorated batteries in advance to ensure that the power supply is operating normally.
UPS battery internal resistance test can extend battery pack life battery voltage, current, temperature is an important operating parameter of the UPS battery, but cannot reflect the internal state of the battery. Internal resistance is the current internationally recognized to the battery is most effective, the most convenient performance parameters can reflect the degree of performance indicators such as the deterioration of the battery, and these indicators are unable to reflect the voltage, current, temperature and other operational parameters. With the decrease in the capacity state of the UPS battery, the internal resistance of the battery increases.
The larger the capacity, the smaller the internal resistance it reflects, and the internal resistance of the battery will also increase as the battery is increased. Therefore, the internal resistance of the UPS battery has a close relationship with its capacity: high resistance of the battery is an important indicator of battery performance deterioration. It is generally maintained using the battery internal resistance test instrument every 3 months.
It is important to check that there is no leakage liquid in the UPS battery pack. There is a shell deformed. There is no battery presence, and there is a rust and fixed screw at the battery connection.
Loosen, whether the ambient temperature is normal, etc. Only in time, timely deal with it can ensure the normal service life of the battery. By performing internal resistance testing of monomer batteries in the UPS battery pack, it is possible to accurately grasp the performance state of each of the cells in the battery pack.
At the same time, there is an important meaning to ensure the useful life of the battery's power supply stability and extend the battery pack. How to test the internal resistance of the UPS battery? Whether it is the battery that is about to fail, the capacity is insufficient or the battery is filled, it can be reflected in its internal resistance. Therefore, it can be measured by the UPS battery internal resistance, and its working state is evaluated.
Common methods for measuring the internal resistance of the battery include: (1) Density Density Method Important by measuring the density of the UPS battery electrolyte, often used for internal resistance of the open lead-acid battery, not suitable for sealing lead acid Battery internal resistance measurement. Application of this method is narrow. (2) Open circuit voltage method is an open circuit voltage method to estimate the internal resistance of the battery, and the accuracy is very poor.
Even the error conclusion. Because even if a capacity has changed a small battery. The end voltage can still be very normal under the floating state.
(3) DC discharge method DC discharge method is to instantly discharge the battery. Measure the instantaneous voltage drop on the battery. Calculate the internal resistance of the battery through Ohm.
Although this method has also been widely used in practice, it also has some shortcomings. If this method is used to detect the internal resistance of the battery must be in static or offline, online measurement cannot be realized. And the large current discharge will cause a large harm to the battery, which affects the capacity of the battery.
(4) AC injection method AC method is measured by injection of a constant AC current signal IS on the battery, measuring the voltage response signal Vo on both ends of the battery and the phase difference of the two to determine the internal resistance of the battery. This method does not need to discharge the battery, you can realize the internal resistance of the battery. Therefore, it will not affect the performance of the battery.
The method should measure the most AC current signal IS, voltage response signal Vo. And the phase difference between the voltage and the current. Different test patterns are also different on the performance of the UPS battery, and many years of research and application have shown that internal resistance detection is one of the most reliable test methods, and the different failure modes of the battery have different reflection of internal resistance.
Understand the relationship between the internal resistance of the battery and various failure modes, which is conducive to better detection and maintenance of the battery, and has a lot of use of extending the service life of the battery.
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