On Fri Dec 16 13:18:55 PST 2016 [email protected] said: >I really dislike the idea of high voltage BMS wires running all over the place. >My plan, if I use LEAF cells, is to make a PCB that attaches directly to the >battery terminals that has a microcontroller reading the cell voltages and >sending the data via an optically isolated serial bus that is daisy chained >from >one cell to the next.
Which is pretty much what I have done with my current Leaf BMS. Though it's analog, no digital communications, and just has a "something is wrong" signal for the driver. (over or under voltage, broken sense wire, whatever) The problems I'm seeing with this system are: A) You have to be REALLY careful laying out the PC board. (I have one trace too close to the busbar, and if you rotate the board just a tad too far, it'll fry the reg.) B) PC boards compress, so keeping the mounting bolt tight is difficult. C) You MUST mount your modules in a way that always gives you easy access to that end of the module for easy maintenance. D) It gets difficult dealing with the power cable connectors mounted to the same bolt as the regs. I'm currently redesigning it to have probably 6 regs per board, and a short wire harness to the set of modules. Makes it MUCH easier for maintenance. Also makes it easier to mount the regs where you can see them easily. -- Bobcats and Cougars, oh my! http://john.casadelgato.com/Pets _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
