Precautions for use of Sigma Tek valve regulated sealed lead acid batteries
There are many factors that affect the life of lead-acid batteries. The life of a battery is closely related to its operating environment temperature, discharge depth, discharge times, charging current, charging voltage, charging time, and other usage conditions. As long as the correct operation method is adopted, the service life of the battery can be effectively extended. Mainly manifested in the following aspects:
1) Overcharged batteries should be avoided. Under long-term overcharge conditions, water is consumed and hydrogen ions increase due to oxygen evolution reactions at the positive electrode, resulting in an increase in acidity near the positive electrode, accelerated grid corrosion, thinning of the grid, accelerated corrosion of the battery, and reduced battery capacity. If the battery is improperly used and is in an overcharged state for a long time, the grid plate of the battery will become thinner, the capacity will decrease, and the service life will be shortened.
2) Excessive discharge should be avoided. In the event of an emergency, the battery pack will provide emergency power to the corresponding equipment. When the battery is discharged to the termination voltage and continues to discharge, a large amount of lead sulfate inside the battery will be adsorbed onto the cathode surface of the battery, causing "sulfation" on the cathode of the battery, referred to as "sulfuration". Lead sulfate is an insulator, and its formation will inevitably have a significant negative impact on the charging and discharging performance of the battery. Therefore, the more sulfate formed on the cathode, the more capacity and internal resistance of the battery will decrease. The poor charging and discharging performance of batteries will greatly shorten their service life. Discharge depth also has a significant impact on battery life. The deeper the discharge depth of the battery, the number of times it is cycled
The less, therefore, deep discharge should be avoided during use. After the emergency discharge of the battery pack, the capacity of the battery must be restored in a timely manner.
3) Regular charging and discharging operation: Due to the long-term floating charge state of the storage battery of subway trains, there is basically no discharge. Under the long-term floating charge state, the storage battery only charges without discharging, which inevitably leads to passivation of the anode plate of the storage battery, increasing the internal resistance of the storage battery, and greatly reducing the capacity, thereby shortening the service life of the storage battery. Regular charging and discharging operations are beneficial to the internal activation of the battery and can effectively extend its service life. Generally speaking, it is necessary to conduct three charging and three discharging operations for the storage battery within a year. If conditions permit, conducting a charging and discharging operation once every six months will have a good effect
Better.
4) Control the charging and discharging current. The capacity of the storage battery for the Guangzhou Metro Line 1 train is 100 Ah, that is, C (rated capacity of the storage battery)=100 Ah. The optimal charging current for a lead-acid battery pack is 0.1C (i.e., 10 A), and the discharge current is 0.2C (i.e., 20 A). Controlling the charging and discharging current can optimize the performance and service life of lead acid battery packs.
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