The battery power system is a set of communications is an integral part of the investment rate is not small, to strengthen the management of the battery to improve its use to effectively extend battery life, has an important meaning. Currently, electric power supply system of communication supporting the most advanced batteries VRLA battery, according to the equipment needs of communications positions, each of its sections are generally single-voltage 2V, 6V and 12V three kinds, and generally large hub stations often used long life and high reliability battery 2V, in a small office, according to installation requirements, can use two batteries, when used to connect several monomers sections to form a group 48V battery. Power system reliability in demanding times, use two sets of batteries in parallel operation, powered floating manner.
Battery
Battery life can be divided into life cycle, float life and storage life. Battery capacity is reduced to the specified value before the battery charge and discharge cycles as the cycle of life. Under normal working time floating cells, known as the floating life. The float is generally maintenance battery life up to 10 years free.
Cycle life and depth of battery discharge is closely related to each. 30% depth of discharge, the charge-discharge cycles up to 1200 times, 100% depth of discharge, cycle life of only 200 times. Therefore, the use of depth of battery discharge must be avoided.
The results of accelerated aging tests, maintenance-free VRLA batteries at room temperature, the float life of 10 years. It should be noted, float voltage is too high or too low will lead to overcharging or less fresh, and therefore will affect the battery life.
That the role of self-discharge, archiving, maintenance free battery remaining capacity will be reduced by Hsi, generally, the remaining capacity of the battery drops to 50% of the time, called the shelf. At different temperatures, the remaining capacity of the battery and the storage time is a link. When the environment temperature is 250C, the storage life of up to 18 months. When the ambient temperature of 400 degrees Celsius, the shelf life of only 5 months, therefore maintenance-free battery temperature storage can not be too high.
Battery an excellent relationship with the temperature. Generally, if 25 ℃ as a base, usually not more than 15 degrees to 30 degrees. Temperature increases, the discharge capacity of the battery will increase, but lower life expectancy, if the long-term use at high temperatures, the working environment for every temperature rise of 10 ℃, the the use of battery life in half. If the temperature is too low, the battery capacity decreases, the temperature dropped 1 degree for each of its capacity down 1%. Thus, when the camera is in working condition when the float needs by reducing the float voltage to compensate for ambient temperature compensation coefficient for each increase of 1 ℃, each cell (2 V of monomer) of the float voltage to reduce 3 - 5 mV. However, the function of temperature compensation can only operate within a certain range, sony vgp-bps5 battery,sony vgp-bps5a battery battery best work in the environment 20-25 ℃. If the battery voltage is the release of its rated capacity by 80% (capacity control discharge rate corresponding as C10, C3 and other parameters) less than before the 1.8V / simple (cell rate 1 hour discharge to 1.75 V / single cell) should be considered as a replacement.
Battery float running
Determine the life of the battery of three elements: the first is the quality of the product, the second is to maintain the situation, the third is to determine if the battery is float in a good condition. When the normal supply of alternating current, the charging current supply alternating current power through the rectifier and directly on the charged battery in the micro-current (self-discharge power to supplement its energy ) Provision for state and when alternating current from the battery when stopped for a separate power supply load, so often Batteries in good condition, which substantially reduces the cycles of charging and discharging, the battery life prolonged.
1. Regarding the choice of the float voltage
Float voltage of the battery to maintain the battery selection is key for good and bad. If you choose too high float current is too high, not only increases energy consumption for sealed batteries, but also because of the severe decomposition of a hydrogen-oxygen gas explosion Ershi battery. If you choose is too low, you’ll often charge the battery to accelerate due to insufficient battery scrap.
2. Low voltage constant voltage charge (load balanced) Technology
The so-called low-voltage constant load voltage is the past, the traditional constant voltage charging method, but the difference is that commonly used in low voltage constant average load voltage of each voltage across the battery is 2.25 ~ 2.35V constant voltage. When the release of the battery capacity (A • h) and the electrical potential is low, the burden initially to avoid the charge current is too large, charging rectifiers should have the characteristics of current limiting, he is still in constant current load. When the load in a certain volume (A • h), battery electric potential increases, the load current decreases gradually. This pricing method has the following advantages due to be widely used.
Load current late fee is low, and therefore the amount of hydrogen and oxygen and produce little. It can improve working conditions, lower standard room is applicable to all sealed battery charging method, charging voltage of the supply voltage delay and low power programmable allowing a wide range of supply of equipment power, he can switch off if the normal charge to streamline operations, improve reliability, output voltage of the rectifier the maximum small, can be designed to reduce the weight of the transformer rectifier.
3. Float battery voltage and temperature relationship
It should be noted that in the operation of the float, the valve regulated battery voltage and temperature are closely related float, float voltage should be based on the level of ambient temperature to make the appropriate changes. In the case of shallow discharge, the valve regulated battery 2.27V / C (25 ℃) operating in a period of time is the ability to add enough of their energy in the case of deep discharge, the valve regulated recharge Battery voltage can be set at 2.35 ~ 2.40V / C (25 ℃), limit-point set Q to 0.1, after a certain time (discharging the battery fully charged, after the required time depends on the release power, discharge current and other factors) and add capacity, as - in the normal maintenance operation.
To offset the transaction Chong Chongdian because flow dynamics caused by poor voltage control, the compensation valve regulated battery discharge, and climbed a short circuit caused by a loss of battery capacity should be 2-3 months to complete an additional charge of battery.
Battery Maintenance
1. Low-voltage protection and power cuts, under the second
To this end, require the function of the power system must be comprehensive, as are all filled calendar of pay under the second power, temperature, not having a class such as current limiting, and they must establish a perfect system of electricity supply maintenance.
In addition to synchronization are completed, the daily content of the stack is also very numerous, including protection of low voltage, under the power of the other hand, temperature compensation, no level cap , etc., these measures can not guarantee the use of batteries in good condition, extending its life.
Battery power output when the voltage across its fall when a certain value (commonly called the termination voltage) of the time, we must cut its circuit energy or May because of excessive battery discharge, shorten life or even scrapped. Termination voltage, so that the load to avoid excessive battery discharge cutting action and measures called the low voltage protection.
Second, under voltage protection beyond the limited power. When the battery voltage down to a certain value at both ends (usually higher than the termination voltage) on the broken part of the secondary charge only the rest of the main charge. Later, when the voltage drops to a termination voltage, but also cut the main burden for protecting the battery. Both actions and measures to disconnect the load is under power. Under the second is to ensure that the benefits of the discharge of the battery power at a time, however, can give the power of essential equipment for some time to minimize losses of interruption of communication. If you need to achieve, under the secondary electrical function, which begins when the load dc output must be divided into primary and secondary care, has received the corresponding points on the road. Advanced electric power equipment under the quadratic function is very flexible and can adjustable, the second as the voltage, and not to the second round by virtue of the power and low voltage protection, protection of communication to meet priority needs.
2. Battery Charging and discharging of maintenance
The common law is the normal rate: constant current charging method, a constant voltage method and classification of constant flow method of loading.
Using the constant charging current, charging current is always maintained. In the process of charging, the voltage at the battery terminals increased gradually to maintain stability constant load current, external supply voltage should be gradually increased. With this approach, charging time is shorter, but because of late fees, most of the load current is used for the electrolysis of water, if the batteries will generate a lot of bubbles. This not only wastes energy but also to make a substance very active off the board, so this method uses less.
When using a constant voltage method, external supply voltage is kept constant. Throughout the charging process, because the voltage remains the same, if the pricing right, the load current is very high, with tension growing battery, charge current decreases. Therefore, using this method of charging to avoid over charging the battery, but because of the initial charge, charge current is too large, it may also be damaged plate.
Normal current pricing method commonly used is a constant flow classified method of shipment. When you use this method of pricing, the pricing process is generally divided into two phases: the first step, the rate of load current of 10 hours, it usually takes 6-7 hours the battery voltage alone can be up to 2.4V. The second phase of 20 hours, the rate of charge current until the voltage (2.6-2.8V) for two consecutive hours remained stable so far at this stage lasts about 14-17 hours.