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IC Selection for 66 Series Batteries

Haider Mhiesan
Prodigy 200 points
Other Parts Discussed in Thread: BQ34Z100, BQ34110, BQ76PL536A, BQ76PL455A

Hello Everyone,

I want to connect 66  Lead Acid (SLA) batteries in series. Each battery is 12 V, 9 AH (SIGMASTEK SP12-9HR BATTERY - 12 VOLTS 9 AH F2 TERMINAL). So the total voltage is around 800 V. 

Can you please help me to select the best    Protection  , Monitoring, and dedicated Path Configuration Support state-of-charge (SOC) for my application? 

 

I do not have any problem if I have to connect many ICs in series, but what is the best option for my application?

 

 

Thank you so much!

 

  • 0
    TI__Guru 54715 points
    Hi Haider,
    The 2 device options for lead acid are bq34z100 and bq34110. They are gauges only.
    Each IC could be used to monitor several batteries up to the divider ration allowed or with scaling. The communications would need to be combined, and interfaced to a discrete protection system. You could of course use one IC per battery to know the voltage of each. There is an inefficiency in stacking them in that each needs a current measurement for gauging.
  • 0 in reply to WM5295
    Prodigy 200 points
    Thank you so much. Yes it would be ineffecient soultions as you said. If I used Li-Ion batteries in series, is there a recommended ?
    Let say, I will use 3.3 V or 6 V Li-Ion, and will connect them in series to reach 350 V, which IC for battery monitoring and protection can I use? It should be many IC in series.
  • 0 in reply to Haider Mhiesan
    TI__Guru 54715 points
    Hi Haider,
    It is common to stack Li-ion cells in larger systems. Devices such as the bq76PL536A or bq76PL455A can stack to monitor high voltage systems. In these systems current monitoring and protection are designed specific for the system. Please look over the information on the product pages. The general information at www.ti.com/battery may be of interest also.