Hey guys, I recently purchased 16 used cells im building in a 13kw battery, anyway, I bought a bench power supply so I can top balance the cells. I understand you first use constant current then switch to constant voltage to finish charging.i set my voltage to 4.1v on the supply, connected it to a cell and it started charging at constant current at 4.3v 10.3amps. is it ok for the charge voltage to be higher than the cell can take? Or is the maximum cell voltage the maximum charged state? I don't want to f these batteries up. Also, the reason I'm charging single cells is because none of them are at the same SOC, and when I went to connect them in series I was getting sparks and a warm wire (I knew something was amiss right away). Is there a better/faster way to get all the cells at a similar SOC? Thanks
Charging single cell
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MisterSandals
Participation Medalist
What type of cells? lithium ion? (not LiFePO4 i hope)
This doesn't sound right. ??
Happen to have a pic of your setup?
The picture was a lithium ion cell. Thecells I want to charge are lifepo4. When I connected that cell to the PSU I set the voltage to 3.65, now I saw the PSU climb to 4.22 volts and I stopped it because I'm not sure that's right. I took the cells apart, I think I had the wiring fed on the series thinking about it now
LakeHouse
Solar Enthusiast
You need to set the voltage on the Power Supply to 3.65V (or whatever maximum you want) with nothing attached to the leads, I.e., an open circuit.
Then you can attach a cell. The displayed voltage will decrease to whatever voltage the cell is currently at. Do not adjust the voltage while the cell is attached! That’s a recipe for damaging the cell.
MisterSandals
Participation Medalist
Looks like a bench top charger, cannot see what is in background.
You NEED to set the voltage BEFORE connecting to the battery or else you get what you got.
LakeHouse
Solar Enthusiast
No, not ok.
If this is true, throw out that power supply before it ruins your cells.
MisterSandals
Participation Medalist
Care to share so the info can help others?
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