With the popularity of high frequency switching power supply, valve lead acid batteries have been widely used in the power system. Because of its completely sealed, no need to add water to maintain previously known as “maintenance free” battery. That maintenance “free” is a misleading term, which allows the user to relax on the valve regulated lead daily maintenance of battery acid and management, which reduces Laptop battery capacity and lesions early due to lack of battery capacity, or failure in substations and power generation plant accidents were frequent. Therefore, the proper use and care dimensional lead-acid battery VRLA battery to increase their service life is of great importance.
Affecting a major valve battery life
The normal life valve lead acid batteries for over 10 years, in theory, may be 20 years but in actual use often insufficient capacity, failure or early phenomenon. Affect the life of valve lead acid batteries of many factors, including:
1, the ambient temperature
The battery at 25 ℃ environment, availability of a longer life. Temperature, the battery will exacerbate corrosion of the plates at the same time will consume more water, thus reducing battery life, long term operating temperature if higher than 10 ℃, life is about halfway. Valve lead-acid IBM ThinkPad R51 battery changes in capacity with changes in temperature, 25 ℃ when the battery has a capacity of 100% at above 25 ℃, 10 ℃ for each increase in battery capacity would be halved .
Must be careful to do according to actual temperature changes to streamline construction lead-discharge battery acid present, while a battery compartment of the right to control the temperature kept at 22 ℃ ~ 25 ℃ or less.
2 overload
The long-term overload state, the cathode due to the reaction of oxygen evolution, the water is consumed, H + increase, which increases the acidity and near the cathode, the grid corrosion accelerated, causing thinning of the accelerated corrosion of the grid battery, battery capacity reduced, the same time due to water loss intensified, would have drained the danger of the Dell Inspiron 1501 battery, affecting the battery life.
3, an excessive discharge of
Excessive battery discharge occurred mainly in the AC power outage, the battery time to load. When the battery runs down its on-voltage is too low or zero, this will lead to a large number of sulfuric acid inside the battery lead is adsorbed on the surface of the cathode of battery, resulting in the cathode Battery “sulfate.” Lead sulphate is an insulator, its formation is related to the battery charge and discharge performance, have a tremendous negative impact, and therefore the formation of sulphate in the cathode, the higher the greater the internal resistance of batteries, the battery charge and discharge performance, the worse the shorter the lifespan of the battery.
4, the conditions of low discharge current, the impact of
In the discharge current small formed under the particle size of lead sulfate as the conditions of the large discharge current, the size requirements of mainstream higher than the rate of formation of crystals smaller than current conditions, slow the growth of crystals too late to be oxidized very rapidly reduced, and thus a relatively smaller size, whereas in conditions of low current, a crystal of lead sulfate great can be easily restored. Such that crystals of lead sulfate is not a long-term cleanup, will certainly affect the hp 338794-001 battery capacity and longevity. Therefore, the actual expense of the current battery capacity must be executed under a precise calculation.
5, the unbalanced nature of the impact of charge-discharge
The study results showed: composition of the grid alloy and structure in different parts of the distribution is different, leading to the unbalanced nature of the electrochemical properties grid [2], the imbalance is to turn in the float and the load condition of discharge voltage are different, and will be in charge and discharge cycle, so that this difference is increasing and training the so-called “rear battery (battery failure).” The current domestic standards in a group of toshiba PA3191U-2BRS battery float voltage difference between the largest to be ≤ 50mV, the norm in developed countries are ≤ 20mV, should pay attention to the battery and reduce floating state operating voltage differences.
6, thermal runaway phenomenon
As the use of depleted fluid valve regulated lead acid battery design, the infusion of battery electrolyte are adsorbed on the fiber glass, when the load current increases, it is necessary to leave the gas valve, which causes the loss of farm water resistance by significant volume reduction of the charge and discharge large amounts of heat generated in the process, which propagate the heat that the temperature has been taken too late, they will form a thermal runaway. Thermal runaway causes are not promptly reduced float voltage, lax safety valve or pressure valve is open too low, etc. In severe cases of thermal runaway if the landfill has the potential DIP apple A1008 battery voltage transient and Sustainable Housing battery temperature rose to 70 ℃ ~ 80 ℃, and therefore thermal runaway must be a high level of attention.
7, long-term impact of floating charge
Float charging status of battery in the long term, pricing and not the discharge is required to cause passivation of the anode of the battery flat, so that the battery internal resistance increases, the capacity is severely reduced, resulting a shortened life of the battery.
Second, improve the life of valve lead acid battery of measures
With this purpose the life valve lead-acid batteries of factor analysis to improve the life of valve lead acid batteries, we must do:
1 battery of stringent quality levels. In selecting the battery and the process of procurement, we must fully understand the production process manufacturer, manufacturing process and quality control, as well as specifications and so on, if necessary, require manufacturers to conduct the first in the capacity of experiments to screen a difference smaller IBM ThinkPad T40 battery.
A reasonable choice charger. Since the food was monitored over real time and intelligent management capabilities, allowing the battery sealed in the best condition always work, so use high quality switching power supply as a charging unit. High frequency switching power supply system, adopting modular design, when a module is a failure, should be able to immediately withdraw from the race does not affect the normal operation of other modules, module parts should be able AutoFill that batteries are not due to failures caused by excessive discharge module.