1.3 the impact of the unbalanced nature of the charge-discharge
The study results show that: different parts of grid alloy composition and structure of the distribution are different, and thus grid will lead to the unbalanced nature of the electrochemical performance, which in turn is the unbalanced nature of the floating charge and charge and discharge state voltage difference, and as the charge, discharge cycle, so that this difference increasing to form a so-called “behind the battery (battery failure).” At present, the standards require, in one group of the largest battery float voltage difference should be ≤ 50mV, while developed countries are the standard ≤ 20mV, so should pay attention to and reduce the floating state of the battery operating voltage differences.
1.4 thermal runaway phenomenon
VRLA battery because of the use of depleted fluid design, battery electrolyte perfusion are adsorbed on glass fiber, when the charge current increases, on the adoption of necessary safety valve to release gas, resulting in the battery water loss, resistance by large capacity fading and filling, discharge process a large number of calories, such as time to the proliferation of these heat related to temperature increase, will lead to thermal runaway. Thermal runaway causes are not promptly reduce the float voltage, lax safety valve or open valve pressure is too low and so on, in hot severe cases out of control if the discharge, it is possible to make batteries and battery voltage sag moment shell temperature rose to 70 ~ 80 ℃, and therefore thermal runaway problem should elicit a high degree of attention.
VRLA battery 2 Operation and Maintenance
In response to the above affect the service life of VRLA battery factor analysis, in order to improve the service life of VRLA batteries, we must do the following.
2.1 strict quality
In battery selection and procurement process, it is necessary to fully understand the manufacturer’s production process, manufacturing process and quality control tools, as well as technical characteristics and, if necessary, may require manufacturers to carry out the first time in the capacity of experiments to screen a smaller battery difference.
2.2 reasonable charging equipment selection
For valve-regulated lead-acid battery charging equipment selection, the appropriate selection of high-quality high-frequency switching power supply or control power, the ripple coefficient, precision regulator, steady flow of key indicators such as accuracy requirements should be higher and should have real-time monitoring and intelligent management capabilities that will enable sealed battery at all times the best job in the state. For high-frequency switching power supply module when there is failure, should be able to immediately quit running and do not affect the normal operation of other modules to ensure the battery module failures do not cause over-discharge.
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