What's The Prismatic Cell?

The prismatic cell was developed in response to consumer demand for thinner pack sizes

. Introduced in the early 1990's, the prismatic cell makes almost maximum use of space when stacking. Narrow and elegant battery styles are possible that suit today's slim-style geometry.

Prismatic cells are used predominantly for mobile phone battery applications. Prismatic cells are most common in the lithium laptop battery family. The Li-ion polymer is exclusively prismatic.

No universally accepted cell size exists for Li-ion polymer batteries. One leading manufacturer may bring out one or more sizes that fit a certain portable device, such as camcorder battery. While these cells are produced at high volume, other cell manufacturers follow suit and offer an identical cell at a competitive price. Prismatic cells that have gained acceptance are the 340648 and the 340848. Measured in millimeters, '34' denotes the width, '06' or '08' the thickness and '48' the length of the cell.

Some prismatic cells are similar in size but are off by just a small fraction. Such is the case with the Panasonic cell that measures 34 mm by 50 mm and is 6.5 mm thick. If a few cubic millimeters can be added for a given application, the manufacturer will do so for the sake of higher capacities.

The disadvantage of the prismatic cell is slightly lower energy densities compared to the cylindrical equivalent. In addition, the prismatic cell is more expensive to manufacture and does not provide the same mechanical stability enjoyed by the cylindrical cell. To prevent bulging when pressure builds up, heavier gauge metal is used for the container.

The manufacturer allows some degree of bulging when designing the camcera battery pack. The prismatic cell is offered in limited sizes and chemistries and runs from about 400mAh to 2000mAh and higher. Because of the very large quantities required for laptop batteries, special prismatic cells are built to fit certain models. Most prismatic cells do not have a venting system. In case of pressure build-up, the cell starts to bulge. When correctly used and properly charged, no swelling should occur.

by: jackwu

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