BMW hybrid battery module temperature sensor Topic is solved

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fatfash
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BMW hybrid battery module temperature sensor

Post by fatfash »

I need help with information on the type of temperature sensors used in BMW battery modules. I have couple of failed ones and needs to replace them but could not get any leads on the type and value.

Thanks
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crasbe
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Re: BMW hybrid battery module temperature sensor

Post by crasbe »

This one? https://www.hubauer-shop.de/en/temperat ... 47873.html

That's the only temperature sensor that's listed for the HV batteries in the parts catalogue.
fatfash
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Re: BMW hybrid battery module temperature sensor

Post by fatfash »

B052E84E-9F91-442C-AEA6-5D9DD1124248.jpeg
Sensor in red
Sensor in red
Thank you very much. The sensor I do require is the one directly on the batteries
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crasbe
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Re: BMW hybrid battery module temperature sensor

Post by crasbe »

Oh, this is not something you'll be able to get from BMW. They would replace the entire module.

But good luck. I suppose you'll need to characterize the sensor to find a replacement.
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Re: BMW hybrid battery module temperature sensor

Post by mjc506 »

I've got a very rough approximation when working out ADC readings vs temperature. Check lines 92 - 101 here: https://github.com/mjc-506/bmsSerial/bl ... /PL455.cpp

Beta = 1000
Ro = 150 Ohm.
To = 290 (K)

I think I found a pretty close match when searching for these numbers. Good luck!
fatfash
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Re: BMW hybrid battery module temperature sensor

Post by fatfash »

Thanks, will surely have a look at it. I tested a 3950 100k ohms NTC and seems to "work" as I got a a very close ambient temperature reading.
mjc506 wrote: Thu Jan 20, 2022 9:58 pm I've got a very rough approximation when working out ADC readings vs temperature. Check lines 92 - 101 here: https://github.com/mjc-506/bmsSerial/bl ... /PL455.cpp

Beta = 1000
Ro = 150 Ohm.
To = 290 (K)

I think I found a pretty close match when searching for these numbers. Good luck!
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Re: BMW hybrid battery module temperature sensor

Post by mjc506 »

Yes, those are much better numbers, not sure how I came up with mine then!!
fatfash
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Re: BMW hybrid battery module temperature sensor

Post by fatfash »

Have been able to get the "exact" NTC used in the battery modules based on Deutronics HV charger manual. The NTCs are of 2 variant 100k/4.4 and 10k/3.4
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phevbmw
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Re: BMW hybrid battery module temperature sensor

Post by phevbmw »

Hello,

I have same issue with a G30 530e (SP06), i got this reading from Cell Module 2 checked at the connector at room temperature about 25 C,

Temp Sensor 1 90.8 K ohm (Pin 2 - 18)

Temp Sensor 2 1.2 M ohm (Pin 9 - 25)

Temp Sensor 3 91.6 K ohm (Pin 1 - 17)

Did someone here know if it is possible to change only the Temperature Sensor?

Thanks
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Connector_Pin_17-32.jpeg
Connector_Pin_1-16.jpeg
phevbmw
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Re: BMW hybrid battery module temperature sensor

Post by phevbmw »

Cell 3
Checked at the connector

Temp Sensor 1 87 K ohm (Pin 2 - 18)

Temp Sensor 2 125 K ohm* (Pin 9 - 25)

Temp Sensor 3 210 K ohm (Pin 1 - 17)

Cell 4
Checked at the connector

Temp Sensor 1 88 K ohm (Pin 2 - 18)

Temp Sensor 2 85 K ohm* (Pin 9 - 25)

Temp Sensor 3 104 K ohm (Pin 1 - 17)

Cell 5
Checked at the connector

Temp Sensor 1 88.3 K ohm (Pin 2 - 18)

Temp Sensor 2 87.6 K ohm* (Pin 9 - 25)

Temp Sensor 3 89.7 K ohm (Pin 1 - 17)
fatfash
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Re: BMW hybrid battery module temperature sensor

Post by fatfash »

I think only cell module 5 is okay. The temperature sensor reading should be around 80kΩ to 92Ω but less than 100Ω for this particular sensors and any anything above it indicates a failure of the sensor. Module 2 (T2 is bad), Module 3 (T2 & T3 bad), module 4 (T3 is bad). Did you check this with a diagnostic tool to tell you the faulty sensors?
phevbmw
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Re: BMW hybrid battery module temperature sensor

Post by phevbmw »

fatfash wrote: Wed Dec 06, 2023 9:13 am I think only cell module 5 is okay. The temperature sensor reading should be around 80kΩ to 92Ω but less than 100Ω for this particular sensors and any anything above it indicates a failure of the sensor. Module 2 (T2 is bad), Module 3 (T2 & T3 bad), module 4 (T3 is bad). Did you check this with a diagnostic tool to tell you the faulty sensors?
As per scan Cell Mod 2. Is it possible to change the Temp sensor? Desolder the red glue and get a Temp sensor?
Thanks
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fatfash
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Re: BMW hybrid battery module temperature sensor

Post by fatfash »

Yes, you can change it.There is a procedure you have to follow to do this with BMW repair kit that includes the sensor. You can get the procedure from the ISTA you are using under " Repair Manuals and Technical Data / 61 General vehicle electrical system / 61 27 High-voltage battery unit individual component /"
phevbmw
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Re: BMW hybrid battery module temperature sensor

Post by phevbmw »

fatfash wrote: Wed Dec 06, 2023 5:24 pm Yes, you can change it.There is a procedure you have to follow to do this with BMW repair kit that includes the sensor. You can get the procedure from the ISTA you are using under " Repair Manuals and Technical Data / 61 General vehicle electrical system / 61 27 High-voltage battery unit individual component /"
But in BMW Pasrt Catalogue ther eis no sensor available, says complete battery cell :cry:
fatfash
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Re: BMW hybrid battery module temperature sensor

Post by fatfash »

use this part number "61 27 8 849 422". A google search of this will show you what it looks like.
phevbmw
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Re: BMW hybrid battery module temperature sensor

Post by phevbmw »

fatfash wrote: Wed Dec 06, 2023 5:48 pm use this part number "61 27 8 849 422". A google search of this will show you what it looks like.
Great. WIll order same. Do i need some sort of calibration after this fix?
fatfash
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Re: BMW hybrid battery module temperature sensor

Post by fatfash »

No calibration needed. Just follow the procedure of installing the replacement sensor and you should be good.
fatfash
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Re: BMW hybrid battery module temperature sensor

Post by fatfash »

just be careful with the installation. Once the system detects you have opened the HV battery, the contactor will be opened and this will most likely require EOS tester to close the contactor.
phevbmw
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Re: BMW hybrid battery module temperature sensor

Post by phevbmw »

fatfash wrote: Wed Dec 06, 2023 6:23 pm just be careful with the installation. Once the system detects you have opened the HV battery, the contactor will be opened and this will most likely require EOS tester to close the contactor.
Ohh,
To start, I open the HV connector at the boot in order to work on HV (got message on cluster that HV is deactivated). Then I disconnect both 12 battery. After that, I removed the HV battery open it and test inside. So base on what i did, am not sure the system will know that I open the HV as all system are off.

let me know what you think about this. I do not have EOS.
fatfash
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Re: BMW hybrid battery module temperature sensor

Post by fatfash »

This should be fine. Note also, the order of the cell supervision circuit and cell module are not swapped.
phevbmw
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Re: BMW hybrid battery module temperature sensor

Post by phevbmw »

fatfash wrote: Thu Dec 07, 2023 3:15 am This should be fine. Note also, the order of the cell supervision circuit and cell module are not swapped.
I already name them, so sure 100% no mismacth.
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Re: BMW hybrid battery module temperature sensor

Post by fatfash »

Nice
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Re: BMW hybrid battery module temperature sensor

Post by nedim »

Do you have other pinging? I need for whole connector. Thanks
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