Sv: Bakovervendt barnesete

[BauDemo]

I did some logging of a charging of a Zebra Think - the graph is here:

http://www.evmonitor.info/2016/03/graphing-of-charging-of-think-a306.html

[Poppe]

Very interesting but it raises some questions:

Assuming X = time, what happens at about 10 h ?

"Current x100 (right)". If current is in mA it is around 100x100=10.000mA = 10A. OK ?
"Volt -300 (left)". If it said "Volt (left)" I would understand and the voltage would stop at 320V now it stops at 20V ?
"Batt temp -200 (left)" ? If the left side scale is valid the temperature varies between -90 to -60 °C unless it is in Kelvin ? Or is it the right side in which case the temp varies between 40-50 ° ?
"SOC (left)" stops at 100 (% ?) on the right side.

Maybe my brain does not work correctly today 

[stradivaria]

Hi,

There is everything ok with graphic.

There some basic information about Zebra:
Normal battery is heating while charging procedure, but not ZEBRA.

ZEBRA battery is cooling down.

There is what we see. Current is high ( aprox 5A) temperature is dropping down. When it reach critical point (it can be different in different softwares) it stop charging and start heating procedure.
Next time you should put AC RMS value, then we could see, that AC current usage drop down from 9A to 2-3A.
Also, you could measure PWM signal to AC heater.


I think you have problem with keeping temperature in the battery or there is some other things stopping charging (like: isolation fault in charger, DC/DC).

[stradivaria]

Hi,

There is everything ok with graphic.

There some basic information about Zebra:
Normal battery is heating while charging procedure, but not ZEBRA.

ZEBRA battery is cooling down.

There is what we see. Current is high ( aprox 5A) temperature is dropping down. When it reach critical point (it can be different in different softwares) it stop charging and start heating procedure.
Next time you should put AC RMS value, then we could see, that AC current usage drop down from 9A to 2-3A.
Also, you could measure PWM signal to AC heater.


I think you have problem with keeping temperature in the battery or there is some other things stopping charging (like: isolation fault in charger, DC/DC).

[BauDemo]

Sorry guys!
It was my mistake!
I have updated the graph with correct axes for the parameters.
I also added guide values for the parameters.

Assuming X = time, what happens at about 10 h ?

"Current x100 (right)". If current is in mA it is around 100x100=10.000mA = 10A. OK ?
"Volt -300 (left)". If it said "Volt (left)" I would understand and the voltage would stop at 320V now it stops at 20V ?
"Batt temp -200 (left)" ? If the left side scale is valid the temperature varies between -90 to -60 °C unless it is in Kelvin ? Or is it the right side in which case the temp varies between 40-50 ° ?
"SOC (left)" stops at 100 (% ?) on the right side.

Maybe my brain does not work correctly today 

The car stops charging at 80% to measure voltage of the battery and calculate if there are any failed cells.
I fixed the parameters in the graph so it should be easier to read.
The current is a Battery current and not the AC current from the outlet.
Sorry for the mixup.

There is what we see. Current is high ( aprox 5A) temperature is dropping down. When it reach critical point (it can be different in different softwares) it stop charging and start heating procedure.
Next time you should put AC RMS value, then we could see, that AC current usage drop down from 9A to 2-3A.
Also, you could measure PWM signal to AC heater.


I think you have problem with keeping temperature in the battery or there is some other things stopping charging (like: isolation fault in charger, DC/DC).

The charging process does not stop during heating - it just slows down to accommodate the limit imposed by the EVSE (in this case 10A AC current) - check the revised and corrected graph again. I also think you are wrong about the AC RMS current dropping, but I do not want to argue about that without a graph in hand.

What makes you think I have a problem with keeping the temperature in the battery? Maybe you can provide a graph of your car so we have something to compare with?

[stradivaria]

It was mistake reading graphic.

I have sean batteries charging with vacuum lost, it was charging for some time until it gets cold, then stop, heat up and charging again.

In your case it was not stoping, it was lowering current for some time.

[BauDemo]

It was mistake reading graphic.

I have sean batteries charging with vacuum lost, it was charging for some time until it gets cold, then stop, heat up and charging again.

In your case it was not stoping, it was lowering current for some time.

Good to know that the battery does not seem to have a problem. And it is very interesting to hear about batteries that have lost vacuum in the heat isolation layer!