The Test And Application Research Of VRLA Battery Suited In High Temperature Environment

Under the global trend of energy saving and CO₂ emission reduction,the three telecommunication operators China Mobile,China Unicom and China Telecom enhance environment temperature of base stations to reduce energy consumption.However,Valve Regulated Lead Acid?VRLA?battery is the barrier to raise the environment temperature of base stations.Therefore,it is very important to improve the high-temperature performance of VRLA batteries.Traditional lead-acid battery application and failure modes show that under the condition of high temperature environment,corrosion of positive plate grid,the positive active soften to fall off,thermal runaway and loss of water are the factors for battery failure.Water loss,corrosion resistance of positive plate and high temperature resistance will be discussed in this thesis.Study plate material corrosion resistance in Pb-Ca-Sn-Al?Pb 97.963%,Ca 0.069%,Sn 1.943 %,Al 0.022%?alloy and Pb-Ca?Pb 99.926%,Ca 0.069%?alloy.Cathodic polarization curve,AC impedance and cyclic voltammetry measure show that Pb-Ca-Sn-Al quaternary alloy material has high hydrogen evolution,oxygen evolution potential and electrochemical impedance,which can effectively inhibit the precipitation of hydrogen and oxygen,thereby reducing the water loss of battery,improve the life cycles of VRLA battery.So the results show that the quaternary alloy material of 87.8% by weight of the loss of weight for binary alloy.Doing test in corroded electrode for the SEM test,the results show that corrosion holes on the surface of the quaternary alloy material are small and uniform distributed,which helps to increase the contact area of sheeting and active substances.Appling the battery capacity,capacity retention rate,charge-discharge performance,cycle life and high temperature accelerated floating performance tests in assembled VRLA battery with two kinds of alloy material,the results show that tthe performance of quaternary alloy materials VRLA battery has obviously better performance than binary alloy material.Studied the effect of processing technology to the performance of the alloy in plate,compared thermal mechanical stamping process with the traditional casting process,the device external border area with thermal mechanical stamping process is increased,the weight is only 70% of the traditional casting slab lattice.It is found that the plate in thermal mechanical stamping process has orderly arrangement metal atoms,small grains,which improve the corrosion resistance of sheeting under metallographic microscope.By corrosion depth calculation,compare thermal mechanical stamping process production of batteries with the traditional casting technology of battery,the life cycle is doubled.The product application and the long-term tracking test for heating application of base stations indicate that the optimum temperature of base stations is seting air conditioner 35?.Under this temperature,the main equipment's of base stations can operate normally and more than 73% energy saving of base station air-conditioning as well as 18% comprehensive energy saving can be achieved.The energy saving effect is obvious.The improved lead-acid battery has a better performance of the indicators such as the deep cycling,high power,initial capacity and homogeneity of battery cells under the temperature of 35?.The development and application of the improved lead-acid battery at base station should be popularized in order to achieve energy saving by raising environment temperature of base station.