Lithium ion prismatic cells

[brian's baterys]

I have several elpm182-00004 eatery's they are an 8s 1p 4.2v peak voltage per sell 67ah 2.04 kWh so the voltage range is 22.4v to 33.6v asuming a max discharge of 2.8 but to be safe il probly only run them down to 3v i tried taking a couple of them apart and reconfiguring them as a 4s4p but 12-16.8 isn't a very comin voltage range eather and sum 12v equipment starts smoking at 16v also the cells have aluminum terminals with laser welded buss bars so i created spring terminals to contact the cells since i can't solder aluminum and i don't think i can spot weld zinc to aluminum so does anyone have any idea wat equipment wil eork with these voltage ranges or how to attach buss bars to aluminum also the sells are rated for 22.3a continuous and something like 100amp burst.

 

[brian's baterys]

I've ben using these to charge them but i can only get about 10a and i have no idea how to add solar I've ben powering the boost converter from a server power supply and using a buck converter for my load

 

[brian's baterys]

The cooper bars didn't work so now there is an individual spring and aluminum terminal block on each battery post but I'm having problems with balancing so i think i still don't have good contact also it was a lot of work

 

[MisterSandals]

What lithium ion chemistry are those cells? I suspect not LiFePO4 based on the voltages you are talking about.

And, that Overkill BMS specifically says its for LiFePO4. It may "work" but will likely cut off (with default charge profile anyway) before your cells reach their upper charge range.

 

[Hendo7]

i am finding this interesting as i have a tesla module that is 19-33 running volts and can only charge it to 28 volts ,i may try those buck converters and run the module on its own power bank,
thanks for sharing

 

[MisterSandals]

a tesla module that is 19-33 running volts and can only charge it to 28 volts

You should start a thread for this and ping @Ampster - he is an EV battery expert.

 

[Hendo7]

You should start a thread for this and ping @Ampster - he is an EV battery expert.

thanks i will .
didn't mean to hijack the thread