(3) The research on the effect of imbalance on VRLA battery shows that the distribution of alloy composition and structure in different parts of grid are different, which leads to the imbalance of the electrochemical properties of grid. This imbalance will make the float and charge and discharge voltage difference, and with the charge and discharge cycles, so that this difference increases, and with the charge and discharge cycles Reciprocating, so that this difference is increasing, the formation of the so-called "backward battery (battery failure)." At present, the domestic standard requires that the difference of the maximum float voltage in a battery should be ≤50mV, while the standard in developed countries is ≤20mV. Therefore, the difference of the voltage operation of the battery in the float state should be emphasized and reduced. (4) Thermal runaway phenomenon Because of the lean liquid design of the valve-regulated battery, the electrolyte infused in the battery is adsorbed on the glass fiber board. When the charging current increases, it is necessary to release the gas through the safety valve, thus causing the battery to lose Water, internal resistance increases, the capacity decay and charge, discharge process generates a lot of heat. These heat spread too late in the temperature soared, it will form a thermal runaway. The cause of thermal runaway there is no promptly reduce the float voltage, the valve is not strict or open the valve pressure is too low, etc., in the case of severe thermal runaway if the discharge, it is possible to make the battery instantaneous voltage dip and the battery housing The temperature rises to 70 ℃ ~ 80 ℃, so the problem of thermal runaway must be given a high degree of attention. Through the above analysis, the valve-regulated battery maintenance work has some understanding, to be done on the valve-regulated battery maintenance must be done: a. Conditions permitting, the battery room should be installed air-conditioning equipment and the temperature Control between 22 ℃ ~ 25 ℃. This not only extends battery life but also maximizes the battery's capacity. b. In any case, the float voltage of the battery should not exceed the float value given by the manufacturer, and the float voltage value should be adjusted at any time by the voltage regulation coefficient ± 3mV / ℃ according to the change of the ambient temperature. c. In view of the unbalanced effect on the VRLA battery, the lower limit of the float voltage should be used for floating power supply. d. The battery should be recharged in a balanced manner after the battery is not well-balanced or discharged more deeply, and when the battery is operated for a quarter of a year. Pay attention to the change of the ambient temperature when balancing the charge, and lower the value of the equalization voltage as the ambient temperature increases. For example, if the ambient temperature is increased by 1 ° C, the value of the balanced charge needs to be reduced by 3mV. e. Try charging the "outdated battery" with pulse charging to promote the recovery of the battery. f. Meticulously maintaining, before the valve-regulated battery pack is put into operation, the voltage and internal resistance data of each single battery should be carefully recorded and properly stored as the original data. After every half year of operation, the data to be run should be carried out with the original data Comparison, such as the discovery of anomalies should be promptly processed. g. VRLA batteries to run to the service life of 1/2, the need to properly increase the frequency of testing, in particular, to increase the test single 12V battery. If the battery resistance suddenly increases or the measured voltage has a value of instability (especially after the decimal point two), always changing, should immediately as a "behind the battery" for processing. h. Wherever conditions permit, a single 2V valve-regulated battery is used for the UPS equipment on the 40Kvac. i. Periodically check the safety valve of the VRLA battery and carefully observe whether the safety valve is sprayed around it to determine if the safety valve is tightened or damaged. J. Battery selection and procurement process, to fully understand the manufacturer's production technology, manufacturing processes and quality control methods, as well as technical characteristics, etc., if necessary, may be required for manufacturers in the first capacity experiments to screen the smaller Battery. In short, communication maintenance work, we should pay attention to the maintenance of valve-regulated batteries, batteries for different characteristics and characteristics of different maintenance requirements, and through the exploration of experience, knowledge accumulation, and constantly improve the level of maintenance, valve-type Battery give full play to its effectiveness, to achieve the intended purpose. [2] Wang Qiuhong, Li Long. Pulse charging of lead-acid batteries [J]. Battery .1995, (2): 38-40. Influence of Sulphation on VRLA Battery [J]. Power Technology, 2001, (5) [3] CHEN Hongyu, WU Ling.Effect of Imbalance on VRLA Battery [J] [4] Bao Weifang, Yan Zhigang, Zhu Yaozhen. Factors Affecting the Deep Cycle Life of VRLA Battery [DB / OL]. NUDE Battery Website (), Battery Technology Specialist [5] GNB Industrial Power Network Power FAQ [ DB / OL].
Matting Agent For Industrial Coatings
Description
1,
Silica Matting Agent reduce the gloss of a variety of products including
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