Julian's Battery Postbag (pb162) - Balancer and BMSs
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- Опубліковано 29 вер 2023
- Battery stuff, including:
www.aliexpress.com/item/10050...
www.aliexpress.com/item/10050...
www.aliexpress.com/item/10050...
www.aliexpress.com/item/10050...
www.aliexpress.com/item/10050...
www.aliexpress.com/item/10050... - Наука та технологія
Owoooo!!!!!!!!!! a post bag nice, and cornering the market on balancers🙂
Squeak!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
@@andymouse Cheese!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I bought six of those 8s balancers and installed them on six 8s1p 200ah packs (byd cells, ~50kg pack wt) . The wire color codes were different in all of them except the red and black were both on the correct places. And all five had bright green leds and one had a yellow led. I haven't checked on them yet after installation they were builds for friends that paid for everything. Bench testing they seemed to work well below 2.5vpc. I forgot to measure how much current they consume while running.
I purchased 2x Yunhui 25A 8s LiFePo4 BMS (they look like the tiny blue one in this video) and after asking about Over Voltage Protection at 3.65v and Under Voltage Protection at 2.50v, I was told they have one with the 6010DA chipsets which uses those parameters.
The original listing was for a 6034-8s-3.2v, 25A, and I was told to request the 6010DA version as a note when purchasing. Sure enough they turned up with the 6010DA battery management IC. I'd be keen to know which BM IC your Yunhui BMS used Julian.
Just waiting for my 30ah prismatic cells to turn up from SJY now. Can't wait to begin the build!
(The BM IC on my BMS modules is a PowTech PT6010EL32-DA and the datasheet does show 3.65v and 2.50v for the respective protection limits. Balancing occurs at the Over-voltage protection recovery value of 3.50v)
I'm not too worried about the 3.75V overcharge protection voltage and 2.1V undercharge protection voltage because the battery should never see those voltages. My discharge relay turns on at 28V (3.5V per cell) and off at 23V (2.875V per cell).
There are 8 chips marked AB3A which appears to be a HY2212 but I can't identify the precise version.
There are also 8pcs marked 12CB which looks like HY2112 with 3.75V upper and 2.1V lower.
I've build a wireless doorbell charger (for the door button) using a CN3801 for the solar controller to charge 1S2P LiFePo4 "AA" 14200 cells) and used the HY2112HB as my protection IC. It also does 3.65v/2.50v protection voltages. It's cool to find all of these variations.
Using those steel angle brackets is introducing some resistance, and heating into the battery. Steel is 3-15% of the conductivity of copper.
Yeah, but they're about 2mm thick - that's about 60x thicker than the copper on the PCBs.
@@JulianIlett 😂😂😂😂 Ahhhh but the skin effect 😄😄😄😄😄😄
"Skin effect does not occur in direct current (DC) systems, because the current flows uniformly throughout the cross-section of the conductor."
@@JulianIlett Mate I know that I did indicate humour 😂😂
Ah, sorry, I don't speak emoji.
I tested those 4s BMSes (green PCB) with LiPo cells and I notice during charging and discharging one of the balance cable hold quite a current compare to the other ones - total discharging with 2.5A, B- holds 2A and 500mA goes via tiny balance cable - is this a bug or feature?
Faulty, I'm guessing.
Be careful with those balancers. You don’t want them running below 3.45Vpc. Gotta do balancing above the knee. That’s why I like the Heltec balancers, they have a run pad you can break with a switch.
Yeah, interesting. I believe this 3.45V figure comes from Andy in the Off-Grid Garage.
My situation is different. I'm charging and discharging almost daily (in winter, less so). I don't take the cells to their top (so can't top balance) and don't take them to their bottom (so can't bottom balance). You can't middle balance LiFePO4 because the voltages are all the same regardless of SOC. So I'm balancing only in the upper-middle and lower-middle ranges. For that reason, the balancer is running all the time.
My 614Wh battery has been doing this for a couple of years and is fine.
This new 768Wh battery will operate in exactly the same manner.
Aluminum brackets are fine for the balancer, but Please use copper for the BMS connection.
Aluminum is used as bus bar material in nearly every major off the shelf battery in the LiFePO4 world.
The BMS at the left side? Okay. How are you going to 'carry' (lift up) the pack? The BMS is not a 'handle'.
He aint done yet, there's gonna be a chassis, wheels and steering and all the rest of it. You do know he's building a car don't you ?
You're right. The BMS in that position means I can no longer carry it. So the BMS will be fitted once the battery is in its final shed location.
How do I use your JLCPCB coupon? I can't find anywhere to input it. 😁
It may have expired. I'm not sure how it works now.
Just stick the BMS to the wood with some velcro tape.
I was expecting to see what was under that aluminum plate on the BMS.
Lots of MOSFETs
This not much expensive!