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BQ2973: Something like BQ2973 but for Primary Battery

Karl Peters
Prodigy 170 points
Part Number: BQ2973
Other Parts Discussed in Thread: TIDA-01546, BQ35100, TIDA-01236, BQ2052

Hello,

I'm looking for an IC like the BQ2973 but for non-rechargeable batteries. The battery I am using is Lithium Thionyl Chloride which does not like to be charged at all! So I would like to know if there is an IC with similar functionality to BQ2973 but that does NOT allow charging? Or is there a reference design where the charge function is disabled. I can't use a blocking diode because of the voltage drop.

Thanks,

Karl

  • 0
    TI__Guru* 80773 points

    Hi Karl,

    I do not know of any protector ICs that are specifically for non-rechargeable batteries. TI does have two different gauging ICs for non-rechargeable batteries - the BQ35100 and the BQ2052. There are also a couple different reference designs for non-rechargeable battery applications: TIDA-01236 and TIDA-01546. 

    Unfortunately, I am not sure if we have and IC that fits exactly what you are looking for, but hopefully these reference designs give some ideas. Is your goal to disconnect the battery from the load if the battery voltage falls below a certain level?

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 170 points

    Hi Matt,

    Thanks for your detailed reply. I suppose there isn't a huge demand for this because primary batteries aren't reused. We've developed a reusable enclosure for primary battery packs and I wanted to integrate protection into a pcb in the enclosure that makes the battery connections.

    My main goal is to implement a 2.5 volt overdischarge cut off and to ensure its impossible for the user to charge the batteries. I can use PTC fuse and bypass diodes for over current and reverse polarity protection. Also would be great to use the BQ35100 as a fuel gauge but voltages change within the enclosure so probably not feasible.

    Best regards,

    Karl