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Lead Acid Batteries

How Lead Acid Batteries Work

The negative electrode supplies electrons to the external circuit (or load) during discharge. In a fully charged lead-acid storage battery the negative electrode is composed of sponge lead (Pb). The positive electrode accepts electrons from the load during discharge. In a fully charged lead-acid battery the positive electrode is composed of lead dioxide (PbO2). It should be noted that the electrodes in a battery must be of dissimilar materials or the cell will not be able to develop an electrical potential and conduct electrical current. The electrolyte completes the internal circuit in the battery by supplying ions to the positive and negative electrodes. Diluted sulfuric acid (H2SO4) is the electrolyte in lead-acid batteries. In a fully charged lead-acid battery, the electrolyte is approximately 37.52% sulfuric acid and 62.48% water, or 1.285 specific gravity.

The separator is used to electrically isolate the positive and negative electrodes. If the electrodes are allowed to come in contact, the cell will short-circuit and become useless because both electrodes would be at the same potential. The type of separator used varies by cell type. Materials used as separators must allow ion transfer between the electrolyte and electrodes. Many separators are made of a porous plastic or glass fiber material. The above components are housed in a container commonly called a jar to form a cell.

Cells and batteries may be connected in series, parallel, or combinations of both. Cells or batteries connected in series have the positive terminal of one cell or battery connected to the negative terminal of another cell or battery. This has the effect of increasing the overall voltage but the overall capacity remains the same. For example, a 12V lead-acid automobile battery contains 6 cells connected in series with each cell having a potential difference of about 2V.

 

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Last Updated: Monday, December 03, 2007 - 6:50 AM Eastern Time.