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Battery Solutions for Energy Harvesting (ISL6605CBZ)

2016-05-10 14:28  
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THINERGY MEC201

Rechargeable batteries ? known as “secondary” cells to differentiate
them from “primary” or single-use cells ? are usually specified for this
task. (For more details and explanation about storagebatteryperformance metrics consult theEnergy HarvestingTechZone article, Understanding Storage Battery Specifications forEnergy Harvesting.)?

Nickel-cadmium (NiCd) batteries have enjoyed the longest market run
among secondary cells for portable electronics, resulting in a mature
technology with low cost. For example, the latest NiCd batteries have
very low internal resistance, rivaling that of standard alkaline
batteries. Terminal voltage changes very slowly as thecellis discharged and NiCd cells do not deteriorate after long periods spent fully discharged. A common NiCdcellsize is AA.?

NiMH offers high discharge rate with lowterminalvoltage droop for relatively high depth of discharge. Energy density can be up to twice that of NiCd cells.?

NiMH cells experience self-discharge rates similar to NiCd; some
so-called hybrid cells incorporate a thicker electrode separator to
reduce the effect.?

Li-Po cells improve power output for a given weight compared to standard Li-ion cells. The electrolyte is solid state.

Solid-state EnerChip thin-film storage cells are also available as
individual cells in standard IC packages. The rated capacity is 50 μAh
at 2 C discharge rate. Figure 4: Cymbet 859-1009-1-ND 50-μAh 4.2-V
thin-filmcell.

Conventional batteries with a liquid electrolyte can freeze and even burst theirbatterycases. As the temperature reduces, internalcellresistance increases.

source :?http://www.digikey.com/us/en/techzone/energy-harvesting/resources/articles/storage-battery-solutions.html