I have started to buy the parts I need for my first build. Next up is buying battery and BMS and weld it together. I have drawn a wiring schema that you can see below. Parts:
- 190 kv motor
- VESC 6
- 10s3p battery of LG HG2
- BMS Bestech HCX-D223V1 http://bestechpower.com/37v10spcmbmspcbforli-ionli-polymerbatterypack/PCM-D223V1.html
LG HG2 Lion battery. Based on some reading this battery should do the job. Hard to find stores who sell good batteries in Norway, but these I found (even though quite expensive). Data sheet: http://keeppower.com.ua/download/2015-06/datasheet-LG_INR18650HG2-1.pdf
From what I read of the battery is “emtpty” when the voltage goes down to 2.5V and it should not charge above 4.29V.
I have looked at the Bestech http://bestechpower.com/37v10spcmbmspcbforli-ionli-polymerbatterypack/PCM-D223V1.html. There are several people stating they use these boards with integrated switches. So I emailed Lucy at Bestech and asked how the recommended to set the parameters for LG HG2 batteries in a 10s3p configuration.
What settings would you recommend?
I recommend over charge detection voltage in 4.25V+/0.05V Over discharge detection voltage 2.50V+/0.0625V Please check whether it is suitable for your project or not.
Based on the battery data sheet I would say that the over charge detection voltage should be set lower, to 4.2V. However, should I also have some margins? I.e. setting this parameter to e.g. 4.15V?
Over discharge is set to the bare minimum according to the battery data sheet. Should I have some margins on this parameter? E.g. set it to 2.7V?
Is release voltage ok to have 0.2 V from the detection voltage? I.e. Over charge release voltage at 4.05V and Over discharge release voltage at 2.7V?
Wiring and switch
Two drawings - one with an X90s anti spark to be able to break the loop and the other without. Does this wiring look sane?
- I guess I could do without the X90s or is it needed to disconnect the VESC while charging? According the Bestech BMS information the BMS Switch must be ON while charging! That means that the VESC do have power while charging. As long as the BMS is doing things right I guess that should be ok?
Thanks for any feedback on the wiring, BMS choice, switches and all other!
Edit: Changed the wiring.