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  Maximize Cycle Life of Rechargeable Battery Packs with Multicell Monitor IC &mdash LT Journal
  PDF, 354 Kb, Datei veröffentlicht: Apr 1, 2010
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  Maximize Cycle Life of Rechargeable Battery Packs
  with Multicell Monitor IC
  Jon Munson Rechargeable battery packs prematurely deteriorate in performance if any cells are
  allowed to overdischarge. As a pack becomes fully discharged, the ILOAD RINTERNAL
  voltage drop of the weakest cell(s) can overtake the internal VCELL chemical potential
  and the cell terminal voltage becomes negative with respect to the normal voltage. In
  such a condition, irreversible chemical processes begin altering the internal material
  characteristics that originally provided the charge storage capability of the cell,
  so subsequent charge cycles of the cell do not retain the original energy content.
  Furthermore, once a cell is impaired, it is more likely to suffer reversals in subsequent
  usage, exacerbating the problem and rapidly shortening the useful cycle life of the pack.
  With nickel-based chemistries, an overdischarge of a set of series-connected
  cells does not necessarily lead to a safety
  hazard, but it is not uncommon for one or
  more cells to suffer a reversal well before
  the user is aware of any significant degradation in performance. By then, it is too late to rehabilitate the pack. In the case
  of the more energetic lithium-based cell
  chemistries, reversals must be prevented
  as a safety measure against overheating or
  fire. Monitoring the individual cell voltages is therefore essential to ensure a long
  pack life (and safety with lithium cells). Figure 1. Simple load-disconnect circuit to prevent excessive discharge of a nickel-cell pack.
  FDS6675 1k
  1.25V 100nF 1k …

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Herstellerklassifikation

• Power Management > Battery Management > Multicell Battery Stack Monitor
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Power Management

Andere Namen:

LTC6801IGTRPBF, LTC6801IG TRPBF