CR2450 battery.Conductivity technology a new trend in battery testing

　　Conductivity technology - a new trend in battery testing Heilongjiang Telecom Network Operation Center Hou Yanhua Heilongjiang Mobile Communications Company Network Department Fu Qiang

　　As a backup power supply for communication systems, batteries play a very important role in ensuring smooth communication and providing high-quality service networks. With the development of communication networks, the number of batteries is increasing, and communication interruption accidents caused by battery failure are becoming more and more frequent. In recent years, various communication operators have attached great importance to the maintenance of batteries, and have equipped communication power maintenance departments with a variety of maintenance tools, hoping to strengthen the maintenance of batteries, maximize the service life of batteries, and save operations. cost, while also hoping to minimize the risk of communication interruptions caused by power outages.

　　However, among various battery maintenance tools, how to choose the most cost-effective and truly effective maintenance tool has always been a major problem faced by maintenance workers of various communication operators. Here are some opinions based on many years of actual maintenance work experience. I hope it will be helpful to the majority of battery maintenance workers when choosing battery maintenance tools.

　　VRLA batteries, which originated abroad, have been rapidly promoted in China in recent years due to their small size, large volume specific energy, no pollution, no need to add water during use and relatively simple maintenance. The misunderstanding that "VRLA batteries do not require maintenance" has also disappeared. It has long been abandoned by people, and the concept of "maintenance-free means no need to add water, not no maintenance" has also been deeply rooted in the hearts of the people.

　　However, VRLA batteries have high requirements on the operating environment and are relatively prone to problems. If outdated single cells that have problems cannot be discovered and replaced or disposed of in time, it is likely to cause extensive damage to the battery pack. This not only brings huge hidden dangers to the smooth communication, but also causes heavy losses of operating assets. Therefore, the first task of VRLA battery maintenance is to find out the backward cells in time. In view of this, it has become inevitable to introduce rapid test instruments under the current situation of reduced maintenance personnel and increasing maintenance workload. Many units have purchased battery capacity testers for this purpose, hoping to use this type of instrument to find backward cells in the entire battery pack through "online short-term discharge". Objectively speaking, the battery capacity tester has indeed greatly improved the progress of battery pack inspections, and it can indeed help find some backward single cells. However, this type of instrument needs to be implemented through online discharge. Therefore, this kind of battery testing technology also exists There is a certain risk, because the battery pack is discharged online to a certain depth. If the mains power is interrupted, the battery pack cannot be guaranteed to have enough energy storage to supply power. This risk is greater for the battery pack with problems; in addition, the capacity tester has the largest The disadvantages lie in the complicated wiring and operation, as well as the relatively large size and weight of the instrument. Faced with hundreds of battery packs, the majority of maintenance workers still feel powerless simply relying on the capacity tester.

　　Similarly, in order to promptly discover backward cells, some European and American countries and some domestic units use battery conductivity testers. This type of tester can judge the capacity of the battery "online without discharging". There is no risk, and there are no complicated connections and operations. It can test a battery in a few seconds. It is small in size and light in weight. It is easy to use. As simple and convenient as a multimeter, it can be said that for the inspection of a large number of battery packs, the battery conductivity tester is undoubtedly the most portable, fast and practical maintenance tool.

　　Many units have been equipped with capacity testers and intelligent dummy loads. They wanted to use this to effectively maintain all battery packs. However, due to the high intensity of work, they were often unable to carry out work on a large area and did not achieve the expected results. If it can be combined with a battery conductivity tester, this problem can be solved well. In daily maintenance inspections, the battery conductivity tester is first used to find outdated single cells. Because it is fast and convenient, it can meet the needs of large-scale work; once the outdated batteries are found, the capacity tester and intelligent With the cooperation of dummy load, a certain depth of discharge test is carried out on the battery pack in a targeted manner. This combination scheme can greatly reduce the work intensity of the majority of battery maintenance workers, and a large number of battery packs can also be maintained in a timely and effective manner. , all the instruments equipped can be fully utilized. Under the existing conditions, it is possible to ensure smooth communication to the greatest extent and extend the life of the battery pack to the greatest extent, thereby saving operating costs and increasing the investment return of various enterprises.

　　The following is a brief introduction in principle to the scientific nature of testing battery capacity using conductivity technology.

　　Conductance is the ability to conduct current. Battery conductance reflects the plate area where the battery unit can undergo chemical reactions and the physical characteristics of the electrolyte. The correlation between the discharge capacity of the battery and the conductance of the battery is very high, and the correlation coefficient can reach 0.8~0.98 (conclusion reached at the 1992 International Telecommunications Energy Conference). Therefore, measuring the conductance of the battery can be used to judge the capacity of the battery. , this conductivity technology battery testing method has also been set as the international standard IEEE (1118-1996). Page 15 of IEEE (1118-1996) stipulates: The measurement of battery conductance is to add an AC voltage of known frequency and amplitude to both ends of the battery, and then measure the generated current. The AC conductance value is the AC voltage in the same phase as the AC voltage. The ratio of current component to AC voltage; significant changes in conductance value (a drop of more than 20%) means changes in battery performance.

　　Conductivity technology can not only be used for daily maintenance of batteries, but also for engineering acceptance of battery packs. It is especially suitable for battery pack selection by various communication operators.

　　Battery maintenance workers often encounter the following phenomenon: several sets of battery packs of the same manufacturer and model are installed at the same time, and the use environment is the same. During the project acceptance, the voltage and capacity of each battery are normal, but after a period of time, After operation, the health status of some battery packs is normal, while some battery packs will abnormally lag behind the cells, and their health status will get worse. The reason for this situation is due to the unbalanced manufacturing process of the battery. This process defect is difficult to reflect simply by measuring the voltage and capacity of the battery during acceptance. If the battery is added during acceptance The conductance balance index excludes monomers with high or low conductance values and selects monomers with balanced voltage, sufficient capacity and uniform conductance values to form a battery pack, which can greatly extend the service life of the battery pack. Similarly, batteries with the same nominal capacity produced by battery manufacturers with different technical levels have different conductances. The greater the conductance value, the smaller the internal resistance, indicating the higher the level of technology and the higher the technical content. Therefore, by measuring different manufacturers The conductivity value of batteries produced with the same nominal capacity can be used as an important indicator for battery selection.

　　With the continuous development of communication networks, it can be expected that the pressure on battery pack maintenance will continue to increase. It is believed that conductivity technology will become the mainstream trend of battery testing technology with its unique scientificity and convenience.

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