Feasibility Analysis of Buried Battery for Outdoor Power Supply

1 Introduction

With the construction and development of communication networks, in order to solve the coverage of network blind spots, a large number of outdoor base stations and outdoor communication equipment have emerged. Since these telecommunication devices are in a harsh external environment, the problem of uninterrupted power supply required by the communication devices has always been a major problem in the industry.

The communication power supply itself can basically meet the harsh outdoor environment, and the real bottleneck is the battery used outdoors. At present, outdoor batteries are difficult to install, easy to be stolen, and the service life of batteries is greatly affected by temperature. How to solve the impact of the outdoor environment on the battery and prolong its service life is very important. On the basis of comparing several methods used for outdoor batteries, this technology proposes a buried method for ventilated batteries, designs and applies a ventilated buried battery cabinet, and combines outdoor switching power supplies to increase monitoring systems to solve the problem of outdoor high temperature. Impact on battery life and moisture gas exchange in battery cabinets that may be encountered with buried batteries.

2 Purpose and meaning

The ventilated underground battery cabinet better solves the problem of DC uninterrupted power supply of outdoor base stations; improves the service life of outdoor power batteries; reduces the comprehensive use cost of outdoor base stations and saves comprehensive energy consumption; Long-term outdoor use opens up a viable avenue.

3 Current situation at home and abroad

There are reports on the use of buried batteries at home and abroad, but there is a problem that the humid gas in the battery cabinet buried in the ground corrodes the battery, thereby reducing the battery life. There is currently no good solution to this problem. The method introduced in this paper, through the monitoring system of the communication power supply, intelligently controls the ventilation fan of the buried battery according to the humidity in the battery cabinet, and through the actual use verification, it can better solve this problem and greatly improve the service life of the battery. This technology is still blank in China at present, and it has great promotion significance.

4 General idea

(1) The battery is buried in the ground to solve the problem of power supply for outdoor communication equipment, achieve better anti-theft and dust-proof effects, reduce the impact of outdoor high temperature on battery life, and prolong battery life.

(2) 12V or 2V batteries can be flexibly used for the burial of battery cabinets. The service life of 2V batteries is higher than that of 12V batteries, so 2V batteries are basically used for buried methods.

(3) Collect the humidity data in the box by installing ventilation fans and humidity sensors in the air duct of the battery cabinet buried in the ground.

(4) Monitor the humidity index in the battery cabinet through the monitoring unit of the communication power supply to determine the frequency of ventilation.

5 Technical solutions

(1) Selection of battery box material and structural processing

Considering that the battery box will be buried in the wet underground for a long time, it is proposed to use plastic to make the box body. At the same time, due to the large box body and many specifications, the method of mold injection is not used, and the plate welding method is used. The thickness of the plate is considered to be 12 mm – 15 mm.

(2) The placement and support of the battery box

Considering that the plastic battery box itself is not strong enough to support the battery, a flat platform is provided at the bottom of the plastic battery box to bear the weight of the battery. If the site is not convenient for masonry work, prefabricated cement boards can also be used.

(3) Waterproofing of battery box

The battery box is waterproof by welding. A waterproof rubber strip is added between the battery box and the box cover, and the waterproof rubber strip is compressed by appropriate fastening measures to achieve the purpose of waterproofing. In addition, the connection between the battery box, the box cover and the PVC pipe is also welded.

(4) Ventilation and heat dissipation of the battery box

Since a small amount of gas overflows during the trial process of the battery, there will be acid gas and moisture in the battery box, which needs to be discharged. First of all, through the proper arrangement of the intake pipe and exhaust pipe, natural breathing can be achieved. In addition, a fan is installed at the end of the exhaust pipe, which is connected through a dry contact and controlled by an independent monitoring unit of the switching power supply. Forced circulation is carried out regularly for about 10 minutes every day, which can completely discharge the acid gas and moisture in the battery box.

Through the independent monitoring unit of the outdoor switching power supply equipment, the control of the fan can be easily realized.

In order to prevent debris from entering the battery box through the intake pipe and exhaust pipe, install insect-proof nets on the nozzles of the intake pipe and exhaust pipe.

(5) Anti-theft problem of battery box

By installing an access control between the battery box and the cover, an alarm can be issued when the battery box and cover are separated.

6 Economic Benefit Analysis

China Mobile Longyan Branch builds about 200 outdoor base stations every year.

Compared with underground installation, there are still many shortcomings in ordinary installation, such as: ① ordinary installation has the problem of anti-theft problem that is difficult to solve; ② ordinary installation has the problem of H-bar load bearing; ③ ordinary installation can only use a maximum of 200AH batteries, and buried The installation does not have this limitation.

7 Conclusion

It can be seen from the above analysis that the ventilated underground battery cabinet saves 10,325 yuan per site per year. If Longyan builds 200 new sites per year, it will save 200 sites and 10,325 yuan/site = 2,065,000 yuan per year.

With the development of mobile services, the number of outdoor stations will increase, that is, more and more batteries are used outdoors. According to the current construction speed of Fujian Mobile, 2,000 new marginal stations will be built every year. If all of them adopt the ventilated battery buried technology, the annual investment saved by Fujian Mobile alone will reach 20.65 million yuan.

In the current international context of increasingly tight energy supply, the state vigorously advocates energy conservation and emission reduction. By adopting the ventilation-type buried battery cabinet, the service life of the battery will be increased by more than 3 times compared with the original one, and the annual cost savings of each site will reach more than 10,000 yuan. If it is promoted nationwide, it will save a lot of resources for the country and has great promotion value.

The Links:   CM300DU-24F D53TP50D INFIGBT

Related Posts