A supercapacitor stack - design and characteristics

Oltean, Ioan D.; Matoi, Adrian Marian; Helerea, Elena

doi:10.1109/optim.2010.5510493

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…As can be seen, the more elaborate the grouping strategy, the lower is the dispersion achieved between the equivalent capacitors of different groups. The randomly grouped case has a total dispersion of 6.8%, which is close to the statistically predicted 6.66% [see equation (11)]. The heuristic distribution strategy decreases the dispersion down to 1.36%, whereas, when recursive partitioning algorithm is used, it decreases to 0.137%, that is, ten times better than the previous case.…”

Section: Examples Of Partitioningsupporting

confidence: 53%

“…Voltage equalization strategies belong broadly to two families: the passive ones and the active ones [11]. Passive equalization networks can be built by clamping diodes that draw current when the related cell voltage goes above its maximum safe value.…”

Section: Esr Esrmentioning

confidence: 99%

“…its nominal power [11]. These two figures, together with the thermal cycling profile, determine the total number of ultracapacitors to be installed, say N. At this point, the designer must decide how the cells are distributed, i.e.…”

Section: Optimal Module Topologymentioning

confidence: 99%

“…The ageing is manifested by an increment of the Equivalent Series Resistance (ESR) and a decrement of the capacitance of the cell. Ultracapacitors are low voltage devices, usually below 3V, and hence they must be serialized up to 50 to 200 elements, depending on the required nominal voltage [11]. Tolerance in capacitive value leads to different voltage levels in series-connected capacitors, which results in two main undesirable effects [12].…”

Section: Introductionmentioning

confidence: 99%

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Voltage equalization of an ultracapacitor module by cell grouping using number partitioning algorithm

Oyarbide

Bernal

Molina

et al. 2016

Journal of Power Sources

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Ultracapacitors are low voltage devices and therefore, for practical applications, they need to be used in modules of series-connected cells. Because of the inherent manufacturing tolerance of the capacitance parameter of each cell, and as the maximum voltage value cannot be exceeded, the module requires inter-cell voltage equalization. If the intended application suffers repeated fast charging/discharging cycles, active equalization circuits must be rated to full power, and thus the module becomes expensive. Previous work shows that a series connection of several sets of paralleled ultracapacitors minimizes the dispersion of equivalent capacitance values, and also the voltage differences between capacitors. Thus the overall life expectancy is improved. This paper proposes a method to distribute ultracapacitors with a number partitioning-based strategy to reduce the dispersion between equivalent submodule capacitances. Thereafter, the total amount of stored energy and/or the life expectancy of the device can be considerably improved.

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Section: Examples Of Partitioningsupporting

confidence: 53%

Section: Esr Esrmentioning

confidence: 99%

Section: Optimal Module Topologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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