Well, it depends on how closely matched the packs are. If they are good quality and closely matched, then you don't really need the cell interconnects between the 2 strings to be all that stiff. Consider that most BMS balancing loads are 100ma or less, it's unlikely to have much more than that flowing between the 2 strings unless there is an actual failure. I've used silicone-insulated 20awg wire for this on a pack before. In the event of a short, the 20awg will fuse and the silicone will not burn and allow the conductors to melt through. If you have an outright failure then this could happen, but otherwise the resistance of the 20awg interconnects will limit the cross-flow current during high pack draw, but allow them to still cross-balance.
On Sun, Oct 9, 2022 at 9:51 AM John Lussmyer <cou...@casadelgato.com> wrote: > I can get a cable in to do cell taps, but running a bunch of cross-module > interconnects that can carry high current is unlikely. > I'd need to use something like 16ga interconnects for between > module/cells. Then would I need to cross-connect with big cables at each > module pair, as well as cable them in series? > On 10/9/2022 9:23 AM, (-Phil-) wrote: > > If it's sealed with no cell taps, how can you build a proper BMS? > > On Sat, Oct 8, 2022 at 8:09 PM John Lussmyer via EV <ev@lists.evdl.org> > wrote: > >> Can't do in this case. Each module is a sealed box of 12s. >> >> On 10/8/2022 5:55 PM, (-Phil-) wrote: >> > The best way to do a parallel setup is cell buddy-pairs if possible. >> > There is no problem doing it this way. Could also "cheat" with 2 >> > separate strings by tying the cell taps together as stiffly as >> practical. >> > >> _______________________________________________ >> Address messages to ev@lists.evdl.org >> No other addresses in TO and CC fields >> HELP: http://www.evdl.org/help/ >> >> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20221009/b27a2f8e/attachment.htm> _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
