[Oeva-list] Help with BMS selection

Datta, Sham M sham.m.datta at intel.com
Wed Aug 8 11:23:16 PDT 2018


I have used Orion BMS for my Toyota EV and is doing an excellent job of maintaining 100 cells. They have a Orion BMS Jr. which is cheaper and works on less number of cells which seems to be good enough for this project. If cost is acceptable, I would vote for this.
Sham

From: oeva-list-bounces at oeva.org [mailto:oeva-list-bounces at oeva.org] On Behalf Of Dima Kukushkin
Sent: Wednesday, August 08, 2018 10:29 AM
To: OEVA List <oeva-list at oeva.org>
Subject: [Oeva-list] Help with BMS selection

Hello dear DIYers!

This topic been around for years, so hoping some one has hands on experience and can advise.

I have 4 cells from Nissan Leaf that i'd like to reuse for my project of battery-assisted kayak.  Need reliable BMS that keeps battery happy, and away from red  zone voltage.

From experience with cheapo BMS (used on for Roomba upgrade) - formal presense of balancing is not in reality doing the balancing work - board instead charges cells to 4.4 volts and then discharges top cells to 4.2
But since current is not  reduced by board at the top of the charge - once power removed - all cells drop below 4.2, and i'm seeing 0.2-0.4v disbalance.  As well as seeing battery above 4.2 for some periods of time.

For Leaf cells - i'd like to configure BMS to keep voltage below 4.1 at all times, while balancing cells.

If this project rings a bell for any one - please give me a helping hand with BMS selection.


Thanks!
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