i3 Battery charging - Degradation real life experience

[alohart]

It's good to try something after you get the car - when I did six months after buying mine, I found that the dealer or previous owner had installed a GPS tracker in the OBD port!

A U.S. i3 would normally sound the alarm a while after it is shut down if an OBD dongle remains plugged in. I don't know how long after shutting down the alarm would sound. I participated in a state of Hawaii pilot program whose goal was to base the annual registration fee on the distance driven with maybe the vehicle's weight considered as well. An OBD dongle was used to transmit distance driven data via a cellular data connection to the DMV. The dongle set off the burglar alarm on our 2014 i3 sometime during the night. To prevent this, the value of the following coding parameter in the Roof Function Center (FZD) could be set to inactive:

OBD socket alarm (BimmerCode expert mode)
3002->OBD-Alarm: active (default)

However, setting this parameter to inactive is considered to increase the risk of an unknown OBD dongle being installed in one's i3. Maybe that change had been made to your i3 when the GPS tracker was installed.

 

[Mondomensch]

A U.S. i3 would normally sound the alarm a while after it is shut down if an OBD dongle remains plugged in. I don't know how long after shutting down the alarm would sound. I participated in a state of Hawaii pilot program whose goal was to base the annual registration fee on the distance driven with maybe the vehicle's weight considered as well. An OBD dongle was used to transmit distance driven data via a cellular data connection to the DMV. The dongle set off the burglar alarm on our 2014 i3 sometime during the night. To prevent this, the value of the following coding parameter in the Roof Function Center (FZD) could be set to inactive:

OBD socket alarm (BimmerCode expert mode)
3002->OBD-Alarm: active (default)

However, setting this parameter to inactive is considered to increase the risk of an unknown OBD dongle being installed in one's i3. Maybe that change had been made to your i3 when the GPS tracker was installed.

Now that you mention it, I was getting spurious alarms, but perhaps that was related to super hot summer days. I have only tried BimmerLink so far but will try BimmerCode at some point in the next few months. In any case, no dongle installed now.

 

[Clanduncan]

Same one I bought in the UK. Works well with the Electrified app, and also allowed me to code my car (with Bimmercode) when I changed the main screen up to a 10.25" unit.

 

[Gonville]

A U.S. i3 would normally sound the alarm a while after it is shut down if an OBD dongle remains plugged in. I don't know how long after shutting down the alarm would sound. I participated in a state of Hawaii pilot program whose goal was to base the annual registration fee on the distance driven with maybe the vehicle's weight considered as well. An OBD dongle was used to transmit distance driven data via a cellular data connection to the DMV. The dongle set off the burglar alarm on our 2014 i3 sometime during the night. To prevent this, the value of the following coding parameter in the Roof Function Center (FZD) could be set to inactive:

OBD socket alarm (BimmerCode expert mode)
3002->OBD-Alarm: active (default)

However, setting this parameter to inactive is considered to increase the risk of an unknown OBD dongle being installed in one's i3. Maybe that change had been made to your i3 when the GPS tracker was installed.

I think that also means a new key can be coded on the steering column with suitable software/hardware via theOBD. Hence why it alarms if it detects current drain on the OBD port whilst armed. Was an issue in UK some time back with cloning kits. Required access to car via some other means usually blocking the locking request from the fob.

 

[Gonville]

Now that you mention it, I was getting spurious alarms, but perhaps that was related to super hot summer days. I have only tried BimmerLink so far but will try BimmerCode at some point in the next few months. In any case, no dongle installed now.

Either a wasp or current drain on OBD for sure.

 

[mfogarty]

Another vote for the Veepeak adapter. Has worked fine with Bimmercode, Bimmerlink and the Electrified app.

 

[jfk68]

I'm coming back from a journey that I knew would be dangerous: 150 km on the highway with my i3 120Ah. 20 km from home: loss of power... I exit the highway and finally end up 500m from home with no power and 13% remaining. Here are the data at this moment.

 

[jfk68]

… Finally a neighbor was able to pull an extension cord and I charged for 20 minutes / 0,5kWh. I was able to leave and strangely with no loss of power for the last 500 meters. The data at this moment:

 

[Mondomensch]

It looks like you had a relatively large difference between minimum and maximum cell voltage in the first readout, with the minimum improving a fair bit after your short extension cord charging.

Could it be that the car wouldn't drive because the lowest-voltage (emptiest) cell was too low and the system wanted to prevent battery damage?

Seems like your pack could use some cell balancing; I'll leave it to the more expert here to make suggestions on how best to accomplish that.

 

[alohart]

It looks like you had a relatively large difference between minimum and maximum cell voltage in the first readout, with the minimum improving a fair bit after your short extension cord charging.

Could it be that the car wouldn't drive because the lowest-voltage (emptiest) cell was too low and the system wanted to prevent battery damage?

Seems like your pack could use some cell balancing; I'll leave it to the more expert here to make suggestions on how best to accomplish that.

I agree with your analysis. This seems to be more evidence that the BMS doesn't calibrate very well for a decreasing usable capacity. Maybe @jfk68 rarely drives to very low charge levels, so the BMS has not had an opportunity to calibrate.

@jfk68, do you typically charge to less than 80%?

It would be interesting to learn the minimum and maximum cell voltage difference when the battery pack's charge level is 100% which is where top-balancing tries to minimize the voltage difference. If a 0.1V difference remains, or even a difference greater than 0.01V, cell charge level balancing should be attempted. Unfortunately, there's nothing that an i3 owner can do to accelerate this process other than to charge to 100% and allow the car to rest at a high charge level as long as possible. Although cell charge level balancing apparently occurs at charge levels less than 100%, it probably occurs most rapidly at 100% because the balancing current would higher at higher voltages. If you drive daily, maybe charge it to 100% at the end of each day before parking it overnight.