Absorbent glass mat and moped batteries

Posted on August 21st, 2008 in Uncategorized by admin

Absorbent glass mat (AGM) is a class of VRLA lead-acid battery in which the electrolyte is absorbed into a fiberglass mat. The plates in an AGM battery may be flat like wetcell lead-acid battery, or they may be wound in a tight spiral. Their unique (for lead acid chemistries) construction also allows for the lead in their plates to be purer as they no longer need to support their own weight as in traditional cells. Their internal resistance is lower than traditional cells, they handle higher temperatures better, and self discharge more slowly.

These batteries have a pressure relief valve which will activate when the battery is recharged at high voltage (typically greater than 2.30 volts per cell, a 12 volt battery has 6 cells). Valve activation allows some of the active material to escape thus decreasing the overall capacity of the battery.The lids (covers) typically have gas diffusers built into them that allow safe dispersal of any excess hydrogen that may be formed during overcharge. They are not permanently sealed, but are maintenance free; and they can be oriented in any manner, unlike normal lead-acid batteries which must be kept upright to avoid acid spills and to keep the plates’ orientation vertical.

Their specific power is very good and they can be charged and discharged quite rapidly, however their specific energy tends to be lower than traditional flooded batteries. They are often used in high performance electric vehicles due to their high power density.

In cylindrical AGM’s, the plates are thin and wound, like most consumer disposable and rechargeable cells, into spirals so they are also sometimes referred to as spiral wound.

In high grade and military spec AGM’s the plates are thin and hand wrapped in envelopes to discourage short circuiting due to vibration2.

AGM, rechargeable batteries usually come in large sizes.


Applications

Most modern motorcycles on the market utilize AGM or factory-sealed AGM batteries for the combined benefits of reduced likelihood of acid-spilling during accidents, and for packaging reasons (lighter, smaller battery to do the same job, battery can be installed at odd angles if needed for the design of the motorcycle).

New 5 series BMWs from March 2007 incorporate AGM batteries in conjunction with devices for recovering brake energy using regenerative braking and a more sophisticated use of computer control to ensure the alternator charges the battery when the car is decelerating.[1]

NASCAR, IHRA, SCORE, and other top racing leagues are continually seeing AGM products introduced into their vehicles. This is due in large part to the fact that these batteries are vibration resistant, and pack power into every pound.
34


Examples

  • 1 Optima (Made in and distributed from Denver, Colorado. Subsidiary of Johnson Controls)
  • 2 Power Stack & Quanta BatteryPower Stack & Quanta
  • 3 (http://www.kinetikpower.com)


See also

  • Car battery

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