Charging with Bench Power Supply?

TheBatteries

TheBatteries

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Does anyone know if a bench power supply, such as the one below, can be used to charge NMC batteries for testing purposes? The power supply has both voltage limiting and current limiting. I think my only concern would be making sure the voltage is precise enough so as not to overcharge. Would this satisfy the CC/CV charging properties? I assume current would begin to throttle back once the cell reaches (or nears) the preset voltage?

Amazon.com: RoMech 30V 5A DC Power Supply Variable - Adjustable Switching DC Regulated Bench Power Supply (Stable Outputs, Alligator Leads & Spare Fuse Included): Industrial & Scientific

Buy RoMech 30V 5A DC Power Supply Variable - Adjustable Switching DC Regulated Bench Power Supply (Stable Outputs, Alligator Leads & Spare Fuse Included): Internal Power Supplies - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com

71ashJRiHUL._AC_SL1500_.jpg

Thanks
 
I got one of those in the mail today.. looks slightly different and post crushed the box...
I assume your thinking is onpoint - I got it to charge laptops & Phone batteries
 
Yeah I got one a couple of weeks ago as well. I guess the obvious danger is that it cant monitor the cell/battery voltage and temperature and unless your standing next to it checking everything yourself, there's now way to throttle down the charging current or cut it out if things start getting scary.
 
0.5 under volt it perhaps?
 
The Kilowatt Challenge said:
Yeah in theory but I wouldn't leave it. I've revived an old 28v battery from an old radio the other day by slowly bringing it up to 30v. Works a treat now. Absolutely crapping myself all the way through it like lol
Click to expand...

Yeah, certainly not suggesting leaving it unattended lol. Although as long as you have a BMS and not charging a raw cell, should have some level of protection at least.
 
Yes it works fine. Use that type every day and have since i was born basically
 
It's risky as the bench power supply may not be accurate enough to limit the voltage output. You can get a lithium battery charger boards (TP4056A based works a treat) from aliexpress dirt cheap and feed 5 volts from power supply to the board._
 
TP4056 would be worse than using the bench PSU. The BPSU has a better resolution. The TP units could vary by 1%. This means anywhere from 4.15V to 4.25V. Not good for "precise" voltage.
If anything, a TP5100 would be better than the TP4056 boards.

According to the Amazon page:
Line Regulation: CV≤0.05% + 1mV / CC≤0.05% + 10mA
Load Regulation: CV≤0.1% + 5mV / CC≤0.1% + 10mA
Ripples and Noises: CV≤10mV (RMS) / CC≤20mA (RMS)
Accuracy: ±1%

So even tho it has a 1% accuracy, the other numbers are 0.1% or 0.05%. Far more accurate
 
Resr if a bench power supply is not accurate enough to charge a lithium battery something is very VERY wrong with that supply and it should go into the scrap. A bench power supply is made to power things reliable including being able to put power into a battery. I would say that the TP4056 is more unreliable than comparing to a decent bench power supply.

Yes i have seen those off by 0.1V but guess what. the TP is more off than that. A TP4056 is more off than 1%. Its up to 1.5% by datasheet.
And the voltage out is therefore:
4.137-4.263 V ;)
 
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