Lead acid batteries, Physics

 

Lead acid batteries:

Lead acid cells have a nominal voltage of 2 Volts, therefore a typical 24V aircraft battery would consist of 12 cells connected in series. The active material in the positive plates is Lead Peroxide (Pb02) the negative plates, Spongy Lead (Pb). The electrolyte is dilute sulphuric acid (2H2SO4).

Construction:

1275_Lead acid cells.png

There are two forms of Lead Acid battery construction, conventional and solid block, often referred to as a Varley type battery.

In the conventional battery the plates consist of lead grids into which the active materials are pressed. The positive and negative plates are then interleaved and connected to a lug that forms both a mechanical support and the terminal.

Cells are generally constructed with an additional negative plate, making both outside plates negative. This ensures that chemical action takes place on both sides of each positive plate. When chemical action only takes place on one side of a positive plate it tends to buckle.  

The plate arrangement is then inserted into a composite material container which is fitted with a lid. The inside of the container is ribbed to provide additional support for the plates, which are raised clear of the bottom of the container to prevent shorting by any sediment that forms.

To provide further support for the plates and to ensure they cannot touch, separators are fitted, these were originally cedar wood but modern batteries use micro-porous plastic materials.

Each cell is fitted with a special non spill valve that allows gasses to escape, but prevents the spillage of electrolyte, this valve can be removed for checking and adjusting the electrolyte level.

The electrolyte used is sulphuric acid diluted with pure distilled water, the specific gravity of the electrolyte used is determined by the manufacturer, however, it is generally lower than 1300.

 

 

 

Posted Date: 9/13/2012 1:59:02 AM | Location : United States







Related Discussions:- Lead acid batteries, Assignment Help, Ask Question on Lead acid batteries, Get Answer, Expert's Help, Lead acid batteries Discussions

Write discussion on Lead acid batteries
Your posts are moderated
Related Questions
is the potential in the cavity of a charged conductor zero

It having of a Cu plate coated with a thin layer of cuprous oxide (Cu2O). On this plate is laid a semi transparent thin film of silver. When light fall, the electrons emitt

Obtain expression for an optical path difference for formation of circular fringe in Michelson''s interferometer

It is the electric dipole moment induced in a system, such as an atom or molecule, by an electric field of unit strength.

Derive a mathematical expression for the magnetic induction at a point on the axial line of a bar magnet. Derive a mathematical expression for the magnetic induction at a point

what is the use of the muslin bag in a dry cell

Three capacitors of capacitance , and are connected in parallel 1) What is the ratio of potential difference? 2) What is the ratio of charges?  Will there be electric

A Neutron Star is formed in the aftermath of a Supernova explosion. The star was originally rotating with a period of 20 days and had a mass of 2x10 30 kg and radius of 6x10 8 m.

Please help me identify a physics based reason for why it may be advantageous to have a less than average person as a jockey in a horse race.

The equation of an equipotential line in an electric field is y=2x then the electric field strength vector at (1,2) may be?