Speaking of batteries
Such a scene might immediately come to mind.
Besides the batteries that are almost inseparable from us every day, there is another type of battery that is usually invisible but has a significant impact on people's work and life: the backup battery system.
Most backup battery systems include uninterruptible power supplies (UPS) and battery packs. It is thanks to these systems that data centers, hospitals, airports, public utilities, railways, oil and gas facilities, and other facilities can continue to operate normally in the face of sudden power outages.
Of course, backup batteries can also fail or malfunction for various reasons, so it is crucial to test the batteries regularly to ensure their health. The professional tool used is a battery analyzer.
Symptoms of battery failure
Common failure modes of backup batteries include:
Leakage corrosion, internal short circuit, electrode plate sulfidation, shell deformation, etc.
A battery in good condition should have a capacity higher than 90% of the manufacturer's rated capacity; most manufacturers recommend replacing the battery when its capacity is below 80%.
Causes of battery failure
Battery performance indicators
First indicator
Battery internal resistance: a qualitative test when the battery is in operation.
Increased internal resistance means reduced battery capacity. When the battery is in operation, use a professional instrument to measure the battery's internal resistance, inject an alternating current to test the voltage change, and calculate the resistance value.
Note: The key to the internal resistance test method is trend judgment; a single data point is insufficient to make a judgment.
The second indicator
Capacity test: The battery is in a non-operating state, and a discharge test is performed.
The best method for discovering a battery's true capacity is through discharge testing, but this is very time-consuming and carries certain risks. In this method, the battery is connected to a load and discharged at a known constant current while the voltage is measured at regular intervals. The battery's capacity is then calculated from the discharge current and discharge time and compared to the manufacturer's specifications.
Note: Discharge testing can only accurately measure capacitance under strict testing standards; the test is difficult to conduct and carries a certain degree of danger.
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