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BQ34Z100-G1 applicability to Deep Cycle multiple cell Lead Acid Batteries

BatMan
Expert 1232 points
Other Parts Discussed in Thread: BQ34Z100-G1

We are investigating the use of the BQ34Z100-G1 device for deep cycle automotive/marine applications.

These batteries are typically 6 cell, 12V lead acid, High current (over 500 CCA) (old technology) non-AGM batteries.

Typical applications may include 20-40 Amp constant drain for several hours (deep cycle). Or 100 to 400A short duration engine cranking followed by slow recharging. Predictability of drain on the battery would be inconsistent at best so I assume some parameters would not be reliable.

Questions:

1. Is the impedance tracking technology applicable to this application? If not, is there another recommended approach you might suggest using TI parts?

2. Can a general battery characterization (chemistry) profile be used for the application or does each battery type need to be specifically characterized/modeled ?Do you have any models of automobile or marine batteries that are available to date?

Any help would be greatly appreciated!

  • 0
    TI__Guru 73830 points

    7178.Chemistry selection.pdfTim,

    We have several customers who use this device in similar applications. The device can support up to 32A, so you will need to use current and capacity scaling to support the discharge currents in your application. We have eight ChemIDs that have already been characterized for PbA batteries and many other matches to these ChemIDs. You can collect data and I can check for a ChemID match using a Mathcad program and you can use the attached document for guidance in collecting the data.

    Tom

  • 0 in reply to ThomasCosby
    Expert 1232 points
    OK thank you for the fast response.
    In one of our applications, the load on the battery being monitored could vary significantly from one power cycle to the next. Does this reduce the accuracy of the gauge parameters appreciably or can the system "learn" sufficiently even with a large load variance?
  • 0 in reply to BatMan
    TI__Guru 73830 points

    The gauge will run the first simulation at the start of discharge and the current will be from the previous discharge cycle. The rest of the simulations will be based on the Load Select setting, so the gauge can compensate for the new load profile.