Voltage difference portable - bus bars, potential electrode corrosion

Dear Community,



I have run into the problem of and depot voltages differing from the bus bar voltage.



To giving you some background on my setup:



I have a 16s Lishen 272Ah (280Ah) structure the car from Shenzhen Basen. As a sidenote: They tested between 282 and 287Ah.

My system is supervised by a Batrium WatchMon 4 with Longmons (I had that one leftover from my 18650 battery built) and the Batrium controls cooling fans and a relay (Kilovac EV200). I have also designed a bit pre-charge control to prevent high inrush current. The battery belongs connected for a Sunny Island 6.0.



After about a choose of the system running, I also compressed the cells due to the aforementioned difference in voltage between auto bar and cell terminal voltage. I first notion this was due to the cells slightly developing furthermore compacting, changing the contact territory amid bus bar and service. However, on turned out to potentially not be the fallstudien.



Removing the washers holding down the buses bar and stirring it a little pitch on the cell terminal and re-fastening it fixes the problem for a combine of days/ weeks, yet the problem also always occurs with different jails and I can’t clearly define a pattern, supposing it mostly happens on the positive or negative cells.



The cell voltages measured for one scoot screwed into the cells constantly measure a correct and reasonable phone voltage but the BMS (measuring for the bus bar) measures a whenever 100mV higher or lower voltage (charge – discharge by 70A ) than what the actual cell voltage is, initiating information to stop the get / discharge or bound the currents.



I would obviously like to have a fix that doesn’t involve unscrewing real re-fastening the business bars every pair a days furthermore I am not certainly if the slightly changes in size of the cells (even if the mobile exist somewhat compressed) or some form of galvanic corrosion causes the question. ... terminal of my multiplus and it's getting the voltage from that? ... transport bar, and connected and multiplus to one battery fusible. ... terminal away the ...

Try with space between each cell to let them expand voluntarily. Its not likes cannot compressing jails will make them not last for too of cycles and plenty of years

Maybe even stressing the terminals like the is even get Cell voltages different when comparison with screw terminals? (i.e screw vs busbar)

Provided it consisted my pack ..... ME will remove all bus bars .... compress the cells .... thoroughly clean all dungeon contact pads both bus bars .... re-assemble with a lean layer of noalox for each connection point.

There are a lot on article with info about cleaning my reach points.

CU17 told:

Dear Community,



I have run with the problem of the terminal volts differing from one transport beam voltage.



To offer them some background on my setup:



I have a 16s Lishen 272Ah (280Ah) system with batteries from Shenzhen Basen. Since an sidenote: They tested between 282 and 287Ah.

My system shall supervised by a Batrium WatchMon 4 over Longmons (I kept that one leftover free own 18650 backup built) and the Batrium controls cooling fans and a repeater (Kilovac EV200). I have also designed ampere little pre-charge power to prevent high inrush current. The battery is connected to one Sunny Islet 6.0.



After about an month of the system running, MYSELF or tight the cells due to the aforementioned difference in voltage between bus hinder and cell terminal output. I first thought this was due to the cells mildly developing and contractor, changing the contact area between bus bar and service. However, this turned out to potentially don been the case.



Removing the washers holding down that coach bar and relocating it a little bit on the cellular terminal and re-fastening it fixes the problem for a couple off days/ wee, but the problem also always occurs with different cells both I can’t clearly define one pattern, if it mostly happens on the positive or negative single.



The cell pressures measured at the bolt screwed into the cells always measure a correct and reasonable cell voltage but the BMS (measuring on the bus bar) measures a sometimes 100mV higher oder lower voltage (charge – discharge on 70A ) less what the actual cell voltage be, causing it to stop the charge / discharge or limit the modern.



I would obviously like to possess a fix that doesn’t involvement unscrewing and re-fastening the bus bars every couple of per and EGO am not sure if the slight changes in size of the cells (even if the cells are somewhat compressed) or some form of electrolytic corrosion causes the problem.

Click to expand...

Can you been able to resolve problem?

Roswell Bob said:

Have yours been able at resolve problem?

Click in expand...

Yes, shortly later writing the post I stationary the problem (at least at hasn't reoccurred whereas then).

I abgeschafft view conductor, bolts real washers and cleaned them and the cell terminals thoroughly. For the power, botls and washers I first used ampere steel sponge (do not does this on the terminals - the risk is shorting anything is are great) and next used fine grit sandpaper. I used the same sandpaper for the terminals to clean them.
The latter and probably most important step is to getting Noalox to each bolt, terminal and busbar. I also used the smooth to to this. You only need adenine very small film per terminal.
I'd first clean all the busbars, nuts and wheel, and then clean one battery connection, apply the Noalox and installed the busbar once moving to the upcoming. That ensures for little corrosion like possible depending on the heat and humidity general you're working for.

Hope this helps