| As a member of recycled secondary power supplies,lead-acid battery is the chemical power source which has been widely applied all over the world.At present,the VRLA batteries of electric vehicles are tending to developing the two aspects of long life and large capacity.In the paper,it focuses on optimizing the performance of lead-acid battery,mainly explored the interior structural design and container formation of VRLA battery.First of all,in order to study the effect of the different container formation on the performance of lead-acid battery,this paper analyzed the parameters of sink temperature?charging quantity and electrolyte proportion.The experiments result show that free lead and the moisture content in the plate decreased by 3%and 3.5%respectively after improving curing process.Thus,it can improve the bonding strength of grid and active substances.When the sink temperature of battery was 40?,the battery had the best initial performance.At the time,the battery had longer cycle life which it terminated after 525times.When the total charging quantity dropped from 155 Ah to 125 Ah,the initial performance of battery is more than the national standard and meanwhile the battery cycle life terminated after increasing from 305 to 414 laps.While electrolyte proportion in the battery had dropped 0.059 g.cm-3.Therefore,when the sink temperature is 40?and the charging quantity of battery is 125 Ah,the lead-acid battery has the best electrochemical performance.Secondly,this paper focuses on the internal structure of lead-acid battery on its performance.In this paper,the interior structural design of battery,grid alloy,curing process were explored.On the basis of the investigation,the difference of battery performance was compared beween the new structure battery with conventional structure battery.The experiments result are as follows.The corrosion rate of grid alloy was 4.01mg·cm-2·d-1 which was lowest after adding rare earth and silver into grid alloy.Using the integral cast-weld construction and the bus-bar which was directing and epoxy sealing,the new structure battery has stronger power during use compared with the conventional structure battery.The new structure battery and the conventional structure battery had the highest capacity at the 0.5 C ratio,but the new structure battery was higher than the conventional structure battery.The discharge capacity of new structure battery was13.73Ah at the 0.5 C ratio.Furthermore,compared to the conventional structure battery cycle life which was 345 times,the new structure battery cycle life was longer which it reached 645 times.Therefore,the new structure of lead-acid battery has has a superior electrochemical performance. |
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