Gas Emission
Towards the end of charging and during overcharge, the current wing into the cell causes a breakdown or electrolysis of water in electrolyte shown by bubbles at the surface. Both hydrogen and oxygen are evolved and released through cell vent caps into battery compartment. There is an explosion risk if hydrogen is allowed to accumulate (flammable range is 4% to 74% of hydrogen air). Thus regulations require good ventilation to remove gas and precautions against naked lights or sparks in enclosed battery compartments (see below)
Topping up
Batteries suffer water loss due to both gassing and evaporation, with consequent drop in liquid level There is no loss of sulphuric acid from the electrolyte (unless through spillage) checks are made to ensure that liquid level s above the top of the plates and distilled water is added as necessary. Overfilling will cause the electrolyte to bubble out of the vent.
No comments:
Post a Comment