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I want to protect 2 18650 batteries with single DW01. The problem is how to increase the protection voltage on DW01 . I have read that I should use voltage divider on VCC pin. I just want to make sure 18650 wont turn into hand grenade.

HERE IS MY SCHEMATIC

schematic

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  • \$\begingroup\$ yeah, or alternatively, many marketed BMSs are adjusted for 2S, 3S, or even more. \$\endgroup\$
    – Christophorus Hansen
    Jul 29, 2021 at 8:12
  • \$\begingroup\$ @ChristophorusHansen Welcome to SE EE. The question is 3 years old - I've converted your answer into a comment (and I realise the system does not allow you to comment initially so that may be what you would have preferred). \$\endgroup\$
    – Russell McMahon ♦
    Jul 29, 2021 at 11:19

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Long story short: The DW01 is, according to its datasheet (first line, first two words; emphasis mine) a

One Cell Lithium-ion/Polymer Battery Protection IC

If it had the capability to really protect two cells in series, they would've marketed it that way.

So, while you can certainly sense a situtation that is definitely overvoltage for both, you won't be able to sense the (likely) situation that one cell failed and you're now overloading the second.

So, your approach is inherently bad, and you should not use a DW01 to protect two cells. Simple as that. Wrong tool for the job.

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  • \$\begingroup\$ Thanks, so I should use onw DW01 for each cell separately .Right ? \$\endgroup\$
    – Richard Ciglanský
    Apr 29, 2018 at 19:32

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