Discussion Starter · #1 ·
Our Lithiumod battery modules handle hot-swapping: when you first connect one to the DC bus, it does an operation (without getting into details here) to ensure that, by the time its internal switch is closed, there won't be a high inrush current to the DC bus. Each module has a BMS, because each module has its own SOC. Additionally, a Master will keep track of all the modules, so that it can report the total capacity and SOC at a given time.Have you done any work, given any thought to, or have recommendation for BMS for hot swap battery systems? Maybe not hot swap in the true sense but the application in particular is our competition EV go-kart. We use Lithium batteries and do a pit stop during the race where the student team removes the battery pack and installs a fresh battery. The kart carries about 4 kWh and they are able to swap it in 7 seconds. The BMS gives us fits and we are not satisfied with our current system, which is pretty much homemade, but have not been able to find a suitable system to buy.
Presently we use three 48V batteries in parallel on the kart, two in the left side package and one in the right side package. The package is connected via an Anderson connector. All charging is done off board.
We need a BMS with cell modules to stay with the battery and quick plug into a "mother" board either on the kart or on the charger. I guess we could have the mother (or control) board on each battery, but we have 10 to 12 of those. The parts must be robust as the races get quite physical if you know what I mean.
This problem has me thinking that some type of RF or bluetooth communication from the cell BMS would be a nice solution. Given any thought to that?
These modules are for stationary use (not automotive use). But they do exactly what you describe above.