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valve regulated lead acid (VRLA)

In the further development of lead batteries, care was taken to ensure that the liquid sulphuric acid would not cause any damage in the event of accidents or mishandling. It has been bound. In the case of the lead-fleece battery, Absorbent Glass Mat (AGM), in a glass-fibre fleece, and in the case of the gel battery, Sealed Lead

Acid (SLA), the sulphuric acid has been bonded with silicic acid to form a gel. The two battery types mentioned - the lead-fleece battery and the gel battery - are encapsulated so that they cannot leak, and are also fitted with a safety valve through which degassing takes place. This sealed design is called Valve Regulated Lead Acid (VRLA)

, whichdoes not adequately describe pressure equalization because within VRLA batteries, recombination occurs by electrolysis between the oxygen generated at the positive electrode with the hydrogen generated at the negative plates. This recombination is over 99% and is aided by the relatively constant internal pressure. Water is generated from the recombination, which compensates for the loss of water. The pressure valve only opens when too much hydrogen

is produced.

VRLA gel battery for 12 V, 120 Ah, photo: Koyosonic

VRLA gel battery for 12 V, 120 Ah, photo: Koyosonic

VRLA batteries are sealed lead batteries whose battery cells cannot be refilled with water and which need to be vented of less gas than conventional lead batteries. This has the advantage that such batteries can also be operated in poorly ventilated rooms.

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Englisch: valve regulated lead acid - VRLA
Updated at: 06.11.2020
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