Diode inside traction battery

Mtn
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08 Nov 2022 15:33 #236388 von Mtn

Diode inside traction battery

Hello everyone, I'm new. I recently bought a Twizy with a dead battery. Inside the battery, I found a dead diode which is connected to the main relay. Please help me find such a diode, I do not know where to buy it. Thank you!

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euver
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08 Nov 2022 16:09 #236391 von euver

Diode inside traction battery

-> Suppression-Diode

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Mtn
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08 Nov 2022 16:12 #236392 von Mtn

Diode inside traction battery

Thanks for the link to the article, but I'm looking for where to buy such a diode.

Danke für den Link zum Artikel, aber ich suche, wo ich eine solche Diode kaufen kann.

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euver
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08 Nov 2022 16:14 #236393 von euver

Diode inside traction battery

and www.twizy-forum.de/werkstatt-twizy/71630-aw-innenansicht-vom-akku?start=165#174210

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TwizyChrisy
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08 Nov 2022 17:06 #236395 von TwizyChrisy

Diode inside traction battery

Look for the 500A Fuse. The Diode is normally not the case for a problem.

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stromkreisparadies
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08 Nov 2022 17:25 - 08 Nov 2022 17:57 #236397 von stromkreisparadies

Diode inside traction battery

the diode shoud have the function to supress the voltages when the relais is switched off. if it is dead or not connected the relais schould work, but maybe kill every electronic device in the car.

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Letzte Änderung: 08 Nov 2022 17:57 von stromkreisparadies.

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Mtn
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10 Nov 2022 09:20 #236446 von Mtn

Diode inside traction battery

Yes, the diode rarely breaks, but this is my case. The diode does not work, so the main relay does not turn on. This is a TVS diode and I can't find it for sale anywhere, does anyone know the reference number of this diode? The number that is written on the diode does not help in the search.

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stromkreisparadies
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10 Nov 2022 14:37 #236462 von stromkreisparadies

Diode inside traction battery

what do you mean? is it shorted? why do you think it is broken? normally it is in parallel to the coils. therefore the main coils schould work even if this diode is broken!

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Mtn
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10 Nov 2022 15:35 #236463 von Mtn

Diode inside traction battery

I check the diode with a multimeter in continuity mode. The diode has no contact on both sides, i.e. it shows "0". Am I doing it right? If I'm wrong please correct me

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Berthold
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10 Nov 2022 15:52 #236464 von Berthold

Diode inside traction battery

If 0 means high resitance in both directions everything is ok. Normaly the Diode causes no problem.

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Snorre
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10 Nov 2022 16:22 - 10 Nov 2022 17:59 #236468 von Snorre

Diode inside traction battery

@Mtn:
In case that you are sure that your diode ist damaged, you must realized, that nobody in the forum seems to know a supllier for it.

I found these two names relating to that diode: "MBR1100" and "MBRS1100"
Maybe this could help you, but probably not.

In case that your are not sure that your diode is damaged, I think it would be a good idea to tell us about the problem that you are suffering from and what happened before.

The more detailed you are reporting, the better for us.
Then we will maybe able to help you to find the origin of the problem.

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Letzte Änderung: 10 Nov 2022 17:59 von Snorre.

Folgende Benutzer bedankten sich: Rebound

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TwizyChrisy
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10 Nov 2022 18:28 #236475 von TwizyChrisy

Diode inside traction battery

Mtn schrieb: Yes, the diode rarely breaks, but this is my case. The diode does not work, so the main relay does not turn on. This is a TVS diode and I can't find it for sale anywhere, does anyone know the reference number of this diode? The number that is written on the diode does not help in the search.

Did you ever think about a bug in the relais? You would NOT be the first one with this problem.

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Mtn
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10 Nov 2022 19:15 - 10 Nov 2022 19:16 #236478 von Mtn

Diode inside traction battery

Yes, I'm not sure if my diode is broken. I have no circuit diagrams, without them it is very difficult to look for a breakdown. This happened while charging from the home network.
Diagnostic results using elm327.
1. DF192 No multiplex signal from BMS
2. DF193 No multiplex signal from BMS
3. DF313 No multiplex signal from BMS
4. DF314 No multiplex signal from BMS
5. DF512 No multiplex signal from BCB
6. DF496 No traction battery ECU

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Letzte Änderung: 10 Nov 2022 19:16 von Mtn.

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TwizyChrisy
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10 Nov 2022 20:41 #236479 von TwizyChrisy

Diode inside traction battery

One more time....
Did you check the funktion of the relais?
Did you check the 500A main fuse?

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Derk
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10 Nov 2022 22:09 - 10 Nov 2022 22:16 #236482 von Derk

Diode inside traction battery

Mtn schrieb: The diode has no contact on both sides, i.e. it shows "0". Am I doing it right? If I'm wrong please correct me

You can't test the diode with a standard multimeter, unless it (the diode) died in a short circuit. Typical breakthrough voltage (when it starts to conduct) is way beyond the voltage supplied by the Multimeter when reading pass-through or resistance. The diode's purpose is overvoltage or transient protection, so unless you apply a suitable high transient voltage, it won't conduct.

I happen to have access to suitable testing equipment (pulse voltage generator) and would be able to verify the diode's functionality, but I don't think it's worth the effort. The problem seems to be elsewhere.

Regards,
Derk

Letzte Änderung: 10 Nov 2022 22:16 von Derk.

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