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COMPARISON ON STUDY OF LITHIUM ION PARALLEL & LEAD ACID PARALLEL CHARGING & DISCHARGING  CHARACTERISTICS

¹MEHER KUMAR

¹ Engineering College , Dayalbagh Educational Institute, Dayalbagh , Agra282005

E-MAIL: meherkumarusic@gmail.com

ABSTRACT:-

Lead acid battery may be used in parallel with one or more batteries of equal voltage. When connecting batteries in parallel, the current from the charger will tend to divide almost equally between the batteries. No special matching of batteries required .If the batteries of unequal capacity are connected parallel, the current will tend to divide between the batteries in the ratio of capacities (actually, internal resistances).When charging batteries in parallel, where different ratios of charge are to be expected, it is best to make provisions to assure the currents will not vary too much between batteries. Lithium batteries can be connected to generate more energy to run larger motors or extra capacity. Connecting the lithium batteries in parallel is one way to increase the ampere-hours of a battery. As far as disadvantages, placing batteries in parallel can make them take longer to charge. Also, the lower voltage means higher current draw and more voltage drop. It may be difficult to power large applications, and one need thicker cables. Imbalanced lithium-ion cells die the first time one try to use them. This is why balancing is absolutely required. Battery cells, especially lithium cells are very sensitive to overcharging and over-discharging. Balancing is only necessary for packs that contain more than one cell in series. Parallel cells will naturally balance since they are directly connected to each other, but groups of parallel wired cells, wired in series (parallel-series wiring) must be balanced between cell groups.