The Main Factors Affecting The Service Life Of Valve-Regulated Batteries
Valve-regulated batteries have the advantages of explosion-proof safety, less use, high battery cell voltage, and easy maintenance. At present, due to the upgrading of charging equipment, especially the application of high-frequency switching power supply, valve-regulated batteries with strict requirements on related indicators (voltage regulation, current regulation, ripple coefficient, etc.) have been widely used. There are mainly two types of valve-regulated batteries: lean liquid type and glue liquid type. Because the valve-regulated battery is fully sealed and does not require water maintenance, it is often called "maintenance-free".
The normal service life of valve-regulated batteries is more than 10 years in full float charge, and can theoretically reach 20 years. However, in actual use, there are many factors that affect the service life of valve-regulated batteries, mainly including:
High ambient temperature has a great impact on the service life of the battery. When the temperature rises, the plate corrosion of the battery will increase, and more water will be consumed at the same time, thereby shortening the battery life. The battery can obtain a long life in an environment of 25 ℃. If the long-term operating temperature is increased by 10 ℃, the service life will be reduced by about half.
In the long-term overcharge state, the positive electrode is consumed due to the oxygen evolution reaction, and the h+ increases, resulting in an increase in the acidity near the positive electrode, accelerated corrosion of the grid, thinning of the grid, accelerated corrosion of the battery, and reduced battery capacity; at the same time, due to water loss Intensified, the battery will be in danger of drying up, thereby affecting the battery life.
Over-discharge of the battery mainly occurs after the AC power supply is cut off, and the battery supplies power to the load for a long time. When the battery is over-discharged to the point that its voltage is too low or even zero, a large amount of lead sulfate inside the battery will be adsorbed to the surface of the battery's cathode, causing "sulfation" at the battery's cathode. Lead sulfate is an insulator, and its formation will have a great negative impact on the charging and discharging performance of the battery. Therefore, the more sulfates formed on the cathode, the greater the internal resistance of the battery, and the charging and discharging performance of the battery. The worse it is, the shorter the battery life will be.
Long-term floating charge
In the long-term floating charge state, the battery is only charged but not discharged, which will inevitably lead to passivation of the anode plate of the battery, increase the internal resistance of the battery, and greatly reduce the capacity, thereby shortening the service life of the battery.
Correct use and maintenance of valve-regulated batteries
The following are the problems that should be paid attention to in the use and maintenance of valve-regulated batteries.