Comprehensive treatment method of battery in harsh use environment

　　Author ：Iflowpower – Portable Power Station Supplier

Communication DC power supply is an underlying telecommunications device for communication main equipment supply security. The battery pack is a desired part of the communication DC power supply system, which is equivalent to the backup power supply, which is the last defense line of the communication DC power system. In the early development of telecommunications services, operators have less concerned about the battery, and the battery can be powered when the exchange is powered off.

In recent years, the competition of telecom operations has intensified, intensive, operators' service life, maintenance work, TCO, require more and more. With the development and technical advancement of the communication network, in order to save construction costs, speed up the construction cycle, in urban and rural combination, small towns and rural areas, operators often do not build a computer room or mobile cranks, but use the outdoor cabinet method to resettle communication Equipment and DC power system. In recent years, in the new base station of the mainstream operators in the world, the proportion of outdoor base stations has increased year by year.

Regarding the low latitude and desertification countries (such as South Asia, Africa, etc.), high temperature on the outdoor base station. Outdoor base stations are generally in remote areas, poor electricity security, especially in developing my country.

Outdoor base stations often face high temperatures, harsh work environments with frequent power outages. Outdoor use of the communication DC power system, the battery is often in a high temperature, and the harsh use environment of frequent power outages in the grid. The problem facing the battery in harsh use environment With the use of the outdoor base station, the battery faults have gradually highlighted, such as Pakistan, India, etc.

, such as Pakistan, India, have caused economic losses and harm the operators. Satisfaction. In response to a large number of damage to the battery in the harsh environment, ZTE has conducted extensive research, in-depth understanding of the use scenario of the battery, investigation and decomposition battery failure.

The key to the problem is not in the battery itself. The problem is not considered for high temperature protection of the battery in the outdoor battery cabinet. To handle the problem fundamentally, the comprehensive treatment of battery use in the harsh environment of the battery is available.

Outdoor battery cabinet proactive heat dissipation technology The heat dissipation of the outdoor outer cabinet has a variety of options, which heat dissipation is suitable for the outdoor battery cabinet? This is to start from the battery characteristics of the battery. For lead-acid batteries in communication DC power systems, users are most concerned about service life. Taste factors affecting the life of lead-acid batteries are environmental temperature and grid conditions.

The life of the lead-acid battery is closely related to the ambient temperature. The higher the ambient temperature, the shorter the service life of the battery. When the ambient temperature is higher than the battery design life requirements temperature (25oC), the temperature is increased by 10oC, and the service life is shortened.

The number of discharges of the battery, the discharge depth is directly affected the battery life. The more the number of discharges, the deeper the discharge depth, the shorter the service life of the battery. In other words, the frequent power failure of the grid will reduce the service life of the battery.

About outdoor base stations, usually, operators are unable to improve grid conditions or improve the cost of grid conditions, so we will start from reducing the operating environment of the battery to improve the service life of the battery. The traditional heat dissipation method of the outdoor cabinet is a fan direct ventilation or a heat exchanger, but does not make the temperature in the cabinet below the ambient temperature outside the cabinet. For use scenarios for high temperature regions (usually above 40 ° C), the temperature of the cabinet in the outdoor battery cabinet is lower than the ambient temperature outside the cabinet by active heat dissipation.

ZTE broke through the routine, combined innovation, introduced the refrigeration part into the outdoor battery cabinet. Communication master (such as GSM, transmission, etc.) and power change part (rectifier) ​​of DC power supply will heat in the process of operation, but the battery is different.

According to the electrochemical mechanism of battery charging and discharge, do not heat when the battery is discharged. Normal charging (but charging) basically does not heat. That is, the battery can be ignored during normal use.

Therefore, there is no heat source in the outdoor battery cabinet, which is small, according to the calculation, usually, the battery cabinet is as long as the amount of the battery cabinet is sufficient. Thermoelectric Refrigeration (TEC) air conditioner adopts emerging semiconductor refrigeration technology, there are many advantages over the use scenario of outdoor battery cabinets, TEC air conditioners and traditional compressor air conditioners have many advantages: 1) Simple structure, high reliability. The entire refrigerator is connected by the thermoelectric refrigeration module and the wire, do not compress the machine, there is no mechanical rotation component, so there is no vibration, no friction, no noise.

High reliability, long life (in 32 ° C, life is more than 100,000 hours). 2) Refrigeration is not accepted. Power supply with DC 48V, powered by the battery to TEC air conditioning during AC power failure, and refrigeration can still be achieved in the outdoor battery cabinet.

3) Refrigeration efficiency and cooling capacity. In the case of large capacity, the efficiency of the thermoelectric refrigeration is not as good as the vapor compression refrigeration. However, the efficiency of the vapor compression refrigerator decreases with the reduction in capacity, and the compressor is not too small, and the efficiency of thermoelectric cooling is independent of the capacity size.

It has advantages in the use of small load loads. The use of the outdoor battery cabinet (small amount of cold), using TEC air conditioning is an ideal choice. 4) Small volume.

Especially suitable for outdoor cabinet installation. 5) Price / performance. The above decomposition, the outdoor battery cabinet uses TEC air conditioner, cost-effective.

6) Convenience. Tec air conditioners do not refrigerant circulation, no compressors turn, regularly pay attention to the anti-insect network should not be blocked, the maintenance work is small. 7) Green environmental protection.

Do not use Fluon refrigerant, no damage to the atmospheric ozone layer, green environmental protection. Based on the above decomposition, we use comprehensive performance than traditional compressor air-conditioning TEC air-conditioning as a refrigerating component of outdoor battery cabinets. High temperature protection capability, a series of TEC outdoor battery cabinets TEC outdoor battery cabinet consisting of TEC air conditioner, cabinet, heat insulation temperature layer, etc.

In order to meet the installation of different capacities and different kinds of batteries, ZTE has designed a series of TEC battery cabinets, two typical cabinets as shown in Figure 1. Figure left cabinet can be installed in 2 sets of narrow length 12V150Ahagm or colloidal battery. The right cabinet can be installed in the right cabinet to install 6 sets of narrow-shaped 12V150ahagm or colloidal storage (or 3 sets wide body 12V150AH or 200AH colloidal battery).

In order to achieve the ideal cooling effect, the cabinet has a good insulation effect. We specialize in heat-insulating cotton, try to use the entire raw material and reduce the opening and cutting, heat-inspected cotton with 40mm thickness. The same IP55 protection grade design is the same as the TEC module.

TEC battery cabinets are well considering refrigeration effect and product reliability in product design, using advanced refrigeration chips, high reliability fans, heat insulation cotton. TEC battery cabinet has good high temperature protection capabilities. Figure 1 Two typical TEC battery cabinets outline synthesis method to improve battery life and reduce TCO related to communication DC power systems in harsh use environments, the main point of consolidation method is through the use of TEC air conditioners to increase the outdoor battery cabinet High temperature protection ability, significantly improve the work environment of the battery.

The outdoor battery cabinet test results in TEC air conditioners are declared. When the temperature of the cabinet is 40 ° C, the temperature in the cabinet is 15 ° C outside the cabinet, and the battery is operated in the optimum use temperature range. Compared with the general outdoor battery cabinet of the TEC outdoor battery cabinet and operators, the service life of the battery has increased by 1.

5 times, and the increase is very large. The comprehensive treatment method uses the TEC outdoor battery cabinet, adding some cost input on the battery cabinet, has obtained precious high-temperature protection, so that the battery works in the best use temperature range, and the batteries caused by the low service life. Batch replacement , The on-site batch replacement of battery purchasing costs, related transportation costs, and replacement of labor costs, thereby reducing the operating and maintenance cost of operators.

The substantial life of the battery life improves the safe and reliable operation of the communication network, significantly improves operator customer satisfaction. Therefore, the use of comprehensive treatment methods is improved in battery life, and the operator has reduced TCO (Totalcostofownership). Using examples and user value comprehensive processing methods have been actually used in Pakistan.

In mid-May 2010, the TEC battery cabinet arrived at a operator of Pakistan, and used a comprehensive treatment approach to the DC power system on site. After the TEC battery cabinet is put into use, the refrigeration capacity is detected, and the temperature trend curve generated by the site detection data is shown in Figure 2. T2 is the internal temperature of the TEC battery cabinet, Tc is an outdoor ambient temperature (measured in a cool place under the awning), ΔT is a temperature difference between the ambient temperature and the temperature in the cabinet.

Figure 2TEC battery condition Temperature trend curve looks from the probe results, during the time period between 12:00 pm, the outdoor ambient temperature is high, up to 45 ° C, the TEC battery cabinet can reach the internal and external temperature difference 15 ° C Refrigeration effect. The internal temperature of the battery cabinet can be controlled between 25 ° C to 30 ° C to meet the best use temperature range requirements of the battery. Through the DC power system on site of the outdoor station in Pakistan, users are very recognized by the comprehensive treatment of ZTE communication.

It is believed that the use of comprehensive treatment methods can greatly improve the living capacity of the battery in harsh use environments, significantly reduce the maintenance work of the battery. , Can effectively reduce the integrated TCO of the outdoor DC power system. .