18650 lithium-ion battery

　　What are the common faults of UPS batteries?

　　There are many common faults of UPS batteries, such as uneven float voltage, battery bulging and deformation, battery leakage, battery water loss, etc. Once the battery detects these conditions, the battery life will end and needs to be replaced or repaired immediately. The next step is Let me introduce the relevant content to you in detail.

　　1. Common faults of UPS batteries

　　1. Unbalanced floating charge voltage

　　Valve-regulated lead-acid batteries commonly have problems with uneven float voltage and open circuit voltage deviation. The uniformity of a valve-regulated lead-acid battery refers to the difference between the open circuit voltage measured after the battery is completed and the float voltage of the battery pack in the float state. Relevant standards stipulate that the difference in the open circuit voltage of each single cell in the battery pack shall not be greater than 20mV, and the difference in the float charge voltage of each single cell in the float charge state shall not be greater than 100mV. If there is a voltage deviation in the battery pack, it will cause early failure of the lagging battery.

　　2. Battery bulging and deformation

　　This is a very destructive phenomenon that occurs when valve-regulated lead-acid batteries are used improperly, that is, thermal runaway, which can cause the battery tank to bulge and deform, accelerate water loss, and even damage the battery.

　　3. Battery leakage

　　Valve-regulated lead-acid batteries will have leakage problems to varying degrees, mainly in battery tank cover leakage, safety valve leakage, and pole terminal leakage.

　　4. Battery loses water

　　Valve-regulated lead-acid batteries work in a "lean" state, and their electrolyte is completely stored in the porous AGM diaphragm. Once the battery loses water, it will cause the positive and negative electrodes of the battery to come out of contact with the electrolyte in the separator, causing the battery to be unable to discharge electricity. The use results show that most of the current reasons for the decline in the capacity of valve-regulated lead-acid batteries are caused by battery water loss. When the water loss reaches 3.5ml/Ah, the battery capacity will drop to less than 75% of the initial capacity; when the water loss reaches 25%, the battery life will be terminated.

　　2. The difference between UPS batteries and storage batteries

　　1. Different subjects

　　UPS: It is a system device that connects the battery to the host and converts DC power into commercial power through module circuits such as the host inverter.

　　Battery: It is a device that directly converts chemical energy into electrical energy. It is a battery designed to be rechargeable and can be recharged through a reversible chemical reaction.

　　2. Different functions

　　UPS: used to provide stable and uninterrupted power supply to a single computer, computer network system or other power electronic equipment such as solenoid valves, pressure transmitters, etc.

　　Batteries: The capacity and weight of batteries cannot be effectively improved, so they are used in automobile and motorcycle engines.

　　3. Different characteristics

　　UPS: When stabilizing the mains power supply, the input voltage range of UPS is relatively wide, generally from 170V to 250V, and the quality of the output power supply is quite high. The output voltage of a backup UPS is between 5% and 8%. The output frequency is stable at 1Hz.

　　Battery: Use a lead plate filled with sponge lead as the negative electrode, a lead plate filled with lead dioxide as the positive electrode, and 1.28% dilute sulfuric acid as the electrolyte.

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