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"Lead Acid Battery" Structure & Work Function (Recharging Process)


Hey, It's Taiful B. A blog writer. Prefer traveling, story writing and so on.

lead acid battery

lead acid battery

Electrochemical cells that transmit electricity from an external source and convert the electrical energy into chemical energy by changing the chemical state of the chemical substance are stored as chemical energy and the stored energy is converted directly into electrical energy when needed.

When lead or a compound of lead is used in both electrodes of a storage cell, it is called lead storage cell.

Structure of a lead Storage cell

Lead is made up of lead rods of different nature at the two electrodes of the storage cell. In this cell, one electrode is the lead metal or lead anode and the other electrode is the cathode of the lead grid covered by lead oxide. Many such anodes and cathodes are arranged in parallel at regular intervals and immersed in a 30% sulfuric acid solution in a thick glass. Leaves immersed in mild sulfuric acid are periodically attached to each other. In this case the first, third, fifth etc. sheets are connected with the positive electric gate with lead oxide and the second, fourth, sixth etc. sheets i.e. with only the negative electric gate. Both electrodes are kept separate by its insulating material. Only the lead plates placed in the cell periodically are connected to the anode electrode and the lead oxide plates are connected to the cathode electrode.

Work Function

During the use of these cells, the lead and lead oxide obtained from the electric gate are converted to lead sulphate and cover the plates of the electric gate with a layer of lead sulphate. In this case there is no difference between electric gates of two different natures. As a result no electricity flows from the cell. In this case you have to recharge.

Discharge process:

: Lead storage cells are converted into galvanic cells when electricity is generated from lead storage cells or batteries are discharged.

Anode reaction(-): Pb(s) + HSO4(aq) → PbSO4(s) + H+(aq) + 2e

Cathode reaction(+): PbO2(s) + HSO4(aq) + 3H+(aq) + 2e → PbSO4(s) + 2H2O(l)

Combining two reactions, the overall reaction is the reverse of the discharge reaction:

Pb(s) + PbO2(s) + 2H+(aq) + 2HSO4(aq) → 2PbSO4(s) + 2H2O(l)

Lead ions are produced productively in both hemispheres. Lead oxide is generated by lead oxidation at the anode. As a result, both lead ions react with ions of lead sulphate to form insoluble lead sulphate around both electrodes.

This high power is used in different types of vehicles. A car battery has 6 cells connected in parallel. Where a total of 12 volts of electricity is generated from each cell as about 2 volts.

charging Process:

The value of the conductive ball of the lead storage battery is 2 volts. The battery needs to be recharged when the value of the electromagnetic ball drops below 1.17 volts as a result of using the battery. The battery or cell is charged by causing a spontaneous reaction by flowing one-way electricity from an external power source in this external recharge process. The reverse process of discharge occurs during recharge. It is connected in reverse order to the power source outside the cell for recharge. In this case the cathode plate should be connected to the positive edge of the power source and the anode plate to the negative edge of the power source. As a result, the negative anode electrode acts as the positive anode electrode and the positive cathode electrode acts as the negative cathode electrode.

Anode reaction(-): PbSO4(s) + H+(aq) + 2e → Pb(s) + HSO4(aq)

Cathode reaction(+): PbSO4(s) + 2H2O(l) → PbO2(s) + HSO4(aq) + 3H+(aq) + 2e

Combining two reactions, the overall reaction is the reverse of the discharge reaction:

2PbSO4(s) + 2H2O(l) → Pb(s) + PbO2(s) + 2H+(aq) + 2HSO4(aq)


TaifulB (author) from Bangladesh on June 12, 2020:


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