| The solar energy is one of the most attractive energy in recentyears. Producing electrical energy through photovoltaic(PV) energy conversion by solarcells is the human counterpart．In order to obtain a continuous electrical supply of energyfrom PV system，energy-storage buffer is required．It is increasingly important for PVpower systems to have reliable and cost effective energy storage，where bottle-neck mayoccur. At present，valve regulated lead-acid(VRLA)battery is the best choice for a storagebattery in the PV power system．However, the service life of VRLA battery applied in PVsystem is shorter than it could be expected due to some environmental factors，such as theinstability of the solar radiation as well as the severe working conditions of batteries inremote areas．The swelling and shedding of the positive active mass are essential to limit the life oflead-acid batteries in the cyclic application. Since the gauntlets of the tubular positiveplates provide good resistance to expansive forces of active mass, the shedding isprevented and the battery has a very good performance in the cyclic application. Therefore,up to now, the majority of motive-power and storage batteries for industrial applications,still use the tubular positive plate design, to ensure their high reliability, long life and totalcapacity output. The applications of gel-technology in batteries ensure VRLA battery hasmore performances. This technology removes electrolyte stratification practically，improves the ability of restitution of capacity in deep-discharge conditions. Thegel-battery has longer life in high temperature.The battery is made of positive and negative plates with optimal formula which areselected by analogue tests. It is found that the battery has better performance in initialcapacity, low-temperature capacity，charge acceptance ability，and discharge in lowtemperature after being charged in high temperature.The effects on charge acceptance ability of tubular positive plate by the Sncontent in PbCa grid, the method of grid surface treating, the way of plate surface washing,is studied. And then, by means of test different positive pastes that add fumed silica or not,analyze the charge acceptance ability of tubular positive plate further more. It is found thatthe positive plate has better charge acceptance ability when the Sn content reaches0.9percent in grid, the grid is soaked in acid liquid, especially the plate soaked in Na2CO3 solution can satisfy the plate standard quickly, reduces in water using, raises the chargeacceptance ability.The acid-recirculation formation technology has the characteristic of cleanliness,environmental protection, and economize on energy. The testing battery is dischargedafter using this technology, then the gel electrolyte is poured into the battery after turningit upside down to let the sulfuric acid out. The first discharge capacity is100%DoD ratedcapacity, and as the cycle test process, the capacity is increasing gradually. The propertiesof battery meet aims we expected.The assembled batteries will be initially charged after gel electrolyte is poured intothe batteries. Different pressure relief valves are installed after initial charge. The test willbe carried out after weighing the batteries. When the throttle pressure of the gel battery is30kPa, reaction efficiency is higher; when the tolerance of the throttle pressure is3kPa,the influence of the consistency of gel battery voltage is little, and as the cycle test process,voltage differences become more unapparent.The storage lead-acid batteries CNF-400J in photovoltaic system is assembled withoptimized formulas and technologies which can improve capacity, charge acceptanceability and other electrochemical properties. Test results show that targets of this kind ofbattery mainly meet the requirements of the GB/T22473-2008(Lead-acid batteries usedfor energy storage). |
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