Mobile base station's choice of battery: battery
With the development of modern mobile communication technology, the construction of communication base stations has become more and more extensive. As an important part of the power supply system of the communication base station, the battery plays an important role in the construction of the power supply system of the communication base station. Choosing a suitable battery power supply, reasonable installation and scientific maintenance are the cornerstones of battery power supply. The engineering application of battery power will play an increasingly important role in the construction and maintenance of communication base stations.
Battery selection
1.1 Basic requirements for battery power communication equipment
The battery is the core equipment to ensure the uninterrupted power supply of the communication equipment, and the requirements of the communication equipment for the power quality determine the requirements of the storage battery equipment.
(1)Long service life
Considering the investment economy, the service life of the battery must match the renewal cycle of the communication equipment Match, that is, about 10 years or so. The service life of the battery is related to the working environment of the battery and the frequency of cyclic charging and discharging. The higher the charge and discharge frequency, the shorter the battery life.
(2) Highly safe
The battery electrolyte is a sulfuric acid solution, which is highly corrosive. In addition, for sealed batteries, the electrochemical process of the battery will generate gas and increase the internal pressure of the battery. When the pressure exceeds a certain limit, it will cause the battery to burst and release toxic and corrosive gases and liquids. Therefore, the battery must have excellent safety. And explosion-proof performance. Generally, the sealed battery is equipped with a safety valve and an acid-proof plate, which automatically adjusts the internal pressure of the battery, and has a liquid acid-proof sheet and explosion-proof function.
In addition, the battery must also have the characteristics of easy installation, maintenance-free, and low internal resistance.
1.2 Selection basis for battery capacity
The choice of battery capacity depends on power supply conditions, load size and load changes. The main basis for determining the general battery capacity is as follows:
municipal power supply type';
how the battery works;
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The global average discharge current during peak hours.
Based on the above-mentioned main basis, the city power supply category is divided into four categories. For different power supply categories, the battery operation mode and capacity selection are different. For example, a city power supply unit can be powered by full-float charging, and the battery capacity can be selected according to the 1-hour discharge rate; the second type of municipal power supply unit can be powered by full-float or semi-float charging, and the battery capacity can be based on the 3-hour The discharge rate is selected; three municipal power supply systems can be powered by charging and discharging, and the battery capacity can be selected for 8-10 hours according to the discharge rate. See Table 1 for the relationship between discharge rate and battery capacity.
Table 1 Discharge current and battery capacity at different discharge rates
In addition, during peak hours, the global average discharge current is also An important factor in determining battery capacity.
The capacity of the selected battery can be calculated according to the following formula:
F, Q battery capacity (amp hours);< /p>
The average global average discharge current during busy hours;
Kn capacity conversion coefficient', that is, the capacity of the battery under the discharge rate of n hours The ratio of the discharge rate to 10 hours.
The lowest temperature of the actual electrolyte. When the battery room has heating equipment, it can be calculated at 15℃. If there is no heating equipment, it should be calculated according to the lowest indoor temperature in the area, but it should not be lower than 0℃.
The electrolyte temperature of the rated capacity of the battery;
The capacity temperature coefficient is 0.006, that is, when the electrolyte is 25℃ as the standard, The ratio of the increased or decreased capacity for each increase or decrease of 1℃ (that is, the ratio of the increase or decrease of the capacity for each increase or decrease of 1℃ when the electrolyte is 25℃ as the standard)
In order to facilitate the calculation, the above formula can be simplified as follows:
Qu003dK·I average
The calculation coefficient of the K unit capacity is shown.
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