Rechargeable Battery

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Rechargeable Battery
by
Michel Zarate MEEN 3344 Spring 2008
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A battery is an electric storage device, which
can come in a variety of shape, size, voltage and
capacity, and translate chemical energy into
electricity and is an efficient way to make
electricity portable. When two materials (often
dissimilar metals) are immersed in a solution
(electrolyte) they conduct electricity, between
the "plates" causing an electrical potential.
Examples are lead acid, nickel cadmium, lithium,
silver alkaline, etc.
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Lithium Battery
Lithium Battery is "general name" that battery
uses lithium metal or lithium aluminum alloy etc
in its negative electrode (Anode). lithium
battery have high energy density, high voltage
and other benefits
A rechargeable battery use solid polymer as
electrolyte. Most Lithium polymer batteries
require heat to promote conductivity. the Lithium
ions inside the battery transfer between the
positive electrode and the negative electrode
during charge or discharge, namely Rocking Chair
Batteries (RCB).
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LI-ION HOW CELLS ARE DAMAGED The biggest
problem with the Li-Ion battery is the ease with
which it can be damaged during use The Li-Ion
battery carries a very large amount of energy in
a small package. Combined with the fact that the
internal resistance is fairly high, you have the
potential for a very dangerous product If the
cell is accidentally shorted, it could get hot
enough to burn a user (and possibly explode).
The Li-Ion cell should never be allowed to drop
below about 2.4V, or an internal chemical
reaction will occur where one of the battery
electrodes can oxidize (corrode) through a
process which can not be reversed by recharging.
A similar process will occur if an Li-Ion cell is
charged to too high of a voltage. If current is
continually forced into a fully charged cell,
internal corrosion can take place which
will reduce cell capacity
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QUESTIONS AND COMMENTS
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REFERENCES

• Ormond, Tom. Rechargeable Batteries. EDN
  Magazine, Dec. 8, 1988.
• 2. Harrison, Michael. Rechargeable Batteries Are
  Included. Powertechnics Magazine, May 1988.
• 3. Baay, David. Nickel-Cadmium Batteries.
  Electronic Products, December 1988.
• 4. Costello, John. Choosing the Right Battery
  to Power the Portable Product. Electronic
  Products,
• December 1992.
• 5. Small, Charles. Nickel-Hydride Cells Avert
  Environmental Headaches. EDN Magazine, December
• 1992.
• 6. Panasonic Corp. Nickel Cadmium Batteries
  Technical Handbook.
• 7. Sanyo Corp. Rechargeable Nickel Cadmium
  Batteries, Engineering Databook.
• 8. Matusita Battery Industrial Co.,Ltd.
  Development of Lithium Ion Rechargeable Battery .
• 9. Sanyo Energy (USA) Corp., Sanyo Lithium
  Ion Battery.
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