Build Your Own Plug-In Hybrid Electric Vehicle by Seth Leitman

Author:Seth Leitman
Language: eng
Format: epub
Publisher: McGraw Hill LLC
Published: 2009-01-15T00:00:00+00:00

FIGURE 8-2 Ford Escape hybrid traction battery diagram. Source: EAA-PHEV.

The electrolyte provides a path for electron migration between electrodes, and also participates in the chemical reaction in some cells. The electrolyte is usually a liquid (an acid, salt, or alkali added to water), but it can be in jelly or paste form.1

Overall Chemical Reaction

Combining the active materials into compounds that further combine with the action of the electrolyte significantly alters their native properties. The true operation of any battery is best described by the chemical equation that defines its operation.

In a charged lead-acid battery, the positive anode plate is nearly all lead peroxide (Pb02), its negative cathode plate is nearly all sponge lead (Pb), and its electrolyte is mostly sulfuric acid (H2SO4). (See the top of Figure 8-3.) When the battery is in a discharged condition, both plates are mostly lead sulfate (PbSO4), and the acid electrolyte solution used in forming the lead sulfate becomes mostly water (H2O). (See the bottom of Figure 8-3.)

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