2023 03 22 ISO21780 A

So can we or is it the right one and we just don't know or is it the exact behavior what we think it must it must have but we have another test specification.
So this is why I want to go through every test and maybe I can also start sharing the screen .
because I see already sent good overview with an Excel sheet with every test what we have and I only added a few new columns.
Can you see my screen already? Yes. Okay.
I only added here a few, so three new columns with the test requirements so that we can really go through test requirement,
test result, is it really passed or is it really failed.
So in this procedure I think this would make sense.
Okay, then I think we can start.
At first with the test one it this pasta we don't need here any further adjustment or I also don't have any question about that.
So are there any questions from your side about test one?
From my side, no, I'm not really familiar because we didn't perform it on BMS level.
Then let's go to test 02.
I'm not sure, Andrej, this will be performed on your side or not?
Yes. Yes, okay.
Okay, so for test O2, it's important to note that we have here the operation mode 2.4, which means normal current behavior over clamp 40 with closed MOSFETs.
And here we have the requirement that we must meet function status one and for test case two function status two for battery functions,
but for communication and diagnostic functions also function status one.
Then for your information, ICI also forwarded you the email from last October where we changed tests, some 48 volt tests.
This is also one test where we did a change that we say maybe we can quickly have a look in the test specification.
Well, okay, test or two. So here it is. So here we changed the lower voltage from 24 to 25 volt so that we can meet the right function status here.
But now we can see here that we failed. So for me the open question would be now since we , since you stayed here,
you're failing when reaching 28 volt, that we again need to change the threshold here,
because I'm not sure if this is the right one at the moment,
that we open at 25. I would also guess that we will open much earlier than we are decreasing,
we are decreasing the voltage. Because here you also say one cell is already lower than 1.9 volt which means we are also not allowed to,
of course we must open the MOSFET and then we are also not allowed to close it anymore.
So this is the normal battery behavior here I guess. So the question would be if we want to have functional status one with this test,
maybe it is required to change here the lower threshold.
We set 24 volts as the threshold, but you can see that CB is just open at 28, so it current tripping criteria or tripping threshold?
Or do we have another one like Fertiwood?
So in general, we need to check which threshold for circuit breaker opening.
Because after we have checked this, we need to discuss if we want to adjust here the functional status,
like that we say, now it is allowed that the circuit breaker will be opened or we leave the functional status as it is,
but we need to change here the lower voltage threshold.
Do you agree that we have these two options?
I agree. I think I should also forward this to Julia because we have to choose which one of these two implemented.
Yeah I will write down here.
Also because this issue with cell voltage under 1.9, I think it's one more test present this issue.
Yeah so I will write down every question what we have and what we think where we need to change
something in this column, then we can afterwards address the question to the responsible people.
Yes, from this, for this question, I think first we need to know the threshold,
and the second and the lowest power should higher one or two voltage than the threshold.
Maybe it's no problem because it satisfies the function A and the FS1.
Yeah, you're right. So if we are choosing the second option when you want to change the lower
voltage threshold, we need to set it a bit higher than the tripping condition.
Yes, it's a little a bit higher.
Yep. Okay, then yeah, for this test, at first we need to check the threshold and then we need to
to discuss whether changing the functional status or the lower voltage threshold.
And when changing the lower voltage threshold, we must set a bit of a gap.
Maybe Yiyui said, and Wentao, you should know the actual voltage and do with the test.
And Wentao, you should confirm how much actual voltage has dropped.
software strain teacher and whether because if the cd open and what's the reason cause the cd open .
and the the bottom point it's a self voltage and the other is the pack voltage i think it's different upper voltage threshold.
So here we also have the dripping but due to the maximum allowed voltage instead of the lowest voltage.
So I would just skip this.
Checking function status or higher voltage threshold. Okay.
This is also fine for everyone.
I think we have here the same problem.
Yes, I think it's fine.
Okay, then for test 03, I would just go through every test and then if we don't have any more time,
I will set up a new meeting, but I think it totally makes sense to go through every test here.
Okay, here for test three you say.
Here we also reach again the maximum threshold.
This is why we open the MOSFET and I think we also are not allowed to close it anymore.
because we are reaching the maximum allowed cell voltage.
So maybe let's have a look again in the test specification.
So here we also had the changing.
So we say we have here two operation modes, 2.1,where we have the open circuit breaker, and 2.4,
we have the closed one with the normal current behavior.
And here, this important, we added here the operation mode in the past, so operation mode 2.1.
So here we changed the tests or the functional status of the test,
because now we are saying that we must reach functional status 1 for operation mode 2.1, which means normal behavior.
And for 2.4, we are allowed to open the MOSFET.
So since we are also reaching here,
we are getting higher than the maximum voltage threshold.
Because 70 volt is much more higher,
we are totally allowed to open a MOSFET.
So in this case, when you say you opened a MOSFET,
this would be the right behavior.
The question is only if it's also,
or if it's the normal behavior that one cell reaches4.5 volt,
so like that we are not allowed to close again if we are falling below the threshold, or then this is also a software question.
do we need to open the MOSFET much more earlier? Because in the end, if we are opening with this voltage and one cell is already at 4.5 volt,
is this too late or is this still fine? So I think here we don't have to change the test specifications since we already added 2.1.
and for 2.4 we are allowed to open the circuit breaker so opening is totally fine.
but here the question would be since we since we don't or when when we open the MOSFET is it too late for protecting the cells .
and if it's not too late then we also need to need to address that we pass the test when the circuit breaker is also not closing anymore.
So I think we have we have two questions here. Again I think also one for Julia.
Yeah.
The one that is upper voltage threshold too high since one cell already reaches maximum value.
So this is a general question, I guess,
for software. And the other question would be, I think this is one which we have to discuss after
Julia answered this question.
If voltage threshold is fine, it must be allowed to not close MOSFET after test again.
So, am I right here or do you want to answer something?
Yes, I was searching the DC in parallel.
So I found that one cell voltage is over 4.8, then the circuit breaker open.
So after which one? 4.8 per cell.
More than I have to see the connection between them.
I think, yeah, this is a question for us.
We need to check checking threshold, upper threshold of pack and cell.
So that's like to do for us so that we can really check maybe if we are tripping because of the cell voltage
or because of the PEC voltage and what kind of gap . do we have between the maximum allowed cell threshold voltage and the PEC threshold.
And afterwards, then we can address this question to Julia and check if it is then fine to not close most of it again if this is a fail.
And I think maybe we also need to check here then if we need to, before we start the test,
to balance the cells, right? So do you think this makes sense or are they already checked
Maybe I think we didn't check the function of the balance
because I think you can see the DMC, you have seen the test supply.
I'm not sure whether we need to check the balancing function.
Okay, but then maybe this would also make sense to check before starting that the cells are balanced,
that we don't have one cell which is then the one which leads to a circuit breaker opening.
I got a good point.
Before the test, we checked the voltage and the cell voltage will update the...
Okay, okay, you do this. Okay, then then then it's already already done. Okay.
Then during the test there's a change, I guess, a slight slight change, maybe.
Okay. And did we forget here something or is this fine for everyone?
that we have these steps for the test? Yes, I'm fine. Which need to be clarified?
The most problem is Julia. She is the answer for every question.
Okay, yeah, then I think we can go to test test 05. Yeah, so here, yeah,
we have no change we have here only stated that for operation or 2.4 we must meet function status 2 and here you're saying that
that you also drop below the lowest threshold.
And once that reaches also 1.9 volt,
which means the circuit breaker will be open and not closed anymore.
So let's have a look again in the test specification.
Here we have the starting profile. file.
So interesting, because here we also have, again, the lowest threshold of 24 volt.
So from my opinion now, since we have here the threshold lower than the one where the circuit breaker must be opened,
and we also don't allow function status free,
From my opinion, we have here two options.
So here we need to adjust something.
So one option would be changing the functional status to FS3 that we are allowed to open the MOSFET,
because this would be a normal behavior when reaching 24 volt.
Or the other option would be to set this voltage up to the, with a gap again, as you said, Jason,
for the test or two higher than the tripping threshold.
For EOS I think it's no problem .because At one point we change the way the voltage is higher than the other side,
and then we think if the lower than the straight-out threshold and think the CB is open, I think it's no problem.
But then if the separate breaker is open, then we need to allow it also here and the function status.
So in the end, we need to change the requirement.
Yes, we need to address the requirement.
Mm-hmm.
OK, so I will write down.
I think at first, again, we need this question here,
the question for Julia.
And then for all changing, I can also copy it.
Okay, so here we have again the same two options then for test 02.