Abstract: The maintenance work of valve regulated lead-acid battery is discussed. Due to the advantages of VRLAB, it can be laid down, stacked and can be placed with communication equipment to save space. The lean solution design eliminates the need to carry out specific gravity measurement during maintenance and is suitable for large current discharge. Under normal circumstances, hydrogen and oxygen recombination is better, will not produce hydrogen; Charging will not produce acid and pollute the environment, and so on. Therefore, it has been widely used in the field of communication. Called a "maintenance-free battery" when
VRLA Batteries were first used in the early 1990s, this was in fact a misleading one, combined with the poor quality of earlier remote-controlled battery products that were often used Something like that or that will happen. Of course, with the development of computer technology, the continuous emergence of large-scale integrated circuit devices, as well as switching power supply,
Ups Power Supply technology continues to improve, power system equipment has made no small improvement in power supply security and reliability Aspects have been greatly improved, the power system equipment maintenance workload has also been reduced a lot. However, in spite of this, with the power system equipment supporting the
VRLA Battery, but still from time to time there are some failures. Therefore, the
Vrla Battery maintenance, whether in the DC power supply system or in the AC and DC
Uninterruptible Power Supply system, are crucial. So, under the current conditions, how to maintain valve-regulated battery? I would like to talk about this issue personal views. First of all, should analyze the quality of valve-controlled battery operation. Valve-regulated battery operation is determined by the quality of three aspects: First, product quality, and second, the installation quality, and third, the quality of operation and maintenance. All three aspects should be said to be very important. Especially the product quality. This is the key to maintaining the good running quality of the VRLA battery, and it is related to every step of the battery production process, that is, from manufacturing the lead powder to packaging and depositing. Therefore, the thickness of the grid, the weight, the formula of the pastel, the permeability of the separator, the technical design of the safety valve, the filling method of the electrolyte and the control of the injection amount of the electrolyte, the way of synthesis, And the shell cover and pole, the cover between the shell and the seal between the various aspects, all aspects of strict checks. For installation quality, but also including storage, installation, capacity experiments and other aspects. These aspects will directly affect the VRLA battery operation and maintenance in the future, so in the process of handling storage should be careful not to collide during the installation process should pay attention to convergence between the strap and the battery pole, be careful Uneven pole leveling. When fastening a pole, the force used can neither be too large nor too small. If too large, will make the pole of the copper sleeve overflow buckle, the force is too small will result in poor contact with the busbar poor, so the installation is best used to provide manufacturers with a force to release the wrench, or in accordance with manufacturers The reference kilogram force, using the corresponding kilogram wrench. In the installation of hydraulic attention to the following aspects: First, to make the battery and the DC panel between the battery positive and positive, negative and negative as much as possible to keep the battery in the high current discharge between the operating balance; Second, To make the battery pack positive and negative busbar and the battery busbar connection between solid and reliable; Third, after installation, do not forget to recharge the battery. For the maintenance of quality, but also to ensure the normal operation of VRLA important aspects. If the maintenance of high quality, you can make VRLA batteries maximize performance and extend the life of use. Therefore, electric maintenance personnel should fully understand the requirements of the VRLA battery products under the premise of the maintenance work carried out, and maintenance work to clarify the following aspects of the relationship and problems; (1) the relationship between temperature and capacity The general standard given by GNB batteries (VRLA batteries) on the Internet is that the capacity of the battery is 100% at 25 ° C; the capacity of the battery is halved for every 10 ° C rise below 25 ° C; When the temperature is below 25 ° C, the relationship between temperature and capacity is as shown in FIG. VRLA battery capacity changes with temperature changes, maintenance personnel must be carefully adjusted according to the actual temperature of the battery discharge current, at the same time to control the temperature of the battery to maintain it at 22 ℃ ~ 25 ℃ or less. (2) Relationship between charge and discharge, life expectancy and capacity a. Relationship between charge and life The maintenance of valve regulated lead-acid battery needs to be established and implemented in order to achieve the best performance and the longest Of the life [1], a large number of domestic and foreign research results show that the charging method determines the life of the battery, some batteries are not so bad, not as good as the improper charging is damaged. In this convenience, many domestic battery manufacturers and research institutes or schools have done a similar experiment. For example, there is a unit, the battery is divided into two groups for experiments, a group of common constant current limiting method for full-capacity life test, the other group is the use of stage constant current charging control of the charging capacity, and later charged Medium-current short-term impact of capacity cycle life test. As a result, two sets of batteries due to different charging methods get a very different cycle life, of which the use of stage constant current charging battery cycle life is longer. Visible, the current is widely used constant current limiting charging method, especially in the late charge is quite regrettable. Due to the rectification equipment currently used, especially the switching power supply does not have the constant current characteristics, there are still some difficulties in using the second charging method, so further exploration on this issue is needed. In addition, at present, some research departments are exploring the use of pulse charging of the VRLA battery. The main process is to pulse charge into one or several stages, each stage has several pulse period. If the whole process is charging 10min? Stop charging 3min? Discharge 3s? Park 1.75min, the last stage of charging 15min and placed a few h, so that the electrolyte cooling and so on. It is said that this method is ideal, can eliminate sulfation [2]. b. relationship between discharge and capacity As we all know, different rates of discharge current will make the battery have different capacities. In the communication power supply DC power supply system configuration of the battery capacity is also different, the actual battery discharge current capacity should have an accurate calculation. It is noteworthy here that the formation of lead sulfate at low current discharge is very difficult to redox because the size of the lead sulfate particles formed at low current discharge is much larger than at large current discharge , That is to say under the condition of high current, the speed of crystal formation is slower than the condition of low current, and the crystal is oxidized and reduced sooner rather than later. As a result, the particles are smaller. In small current conditions, larger lead sulfate crystals are not easily reduced. Such as long lead sulfate crystals can not be cleaned, will inevitably affect the battery capacity and service life.
March 17, 2024