Bosch Powerpack BMS Schottky diode repair

[Batteryrepair]

I've noticed that about 50% of the time, the defect of a broken Bosch Powerpack BMS is related to a broken Schottky diode.
Found under the Blue cylinder:

These are relatively easy to swap. Use plenty of flux !
You can find a broken diode by measuring the Diode voltage drop: has to be somewhere around 0.2V.
Often they fail short, so 0 ohm both ways.
This is the bad component.

Remove the broken diode and prepare the area for new solder (flux and wick)


Solder the new diode. On the side of the capacitors (left in pic) it's a bit tricky, but no worries if the solder bridges to the capacitor, they're connected anyways through the pcb.

Apply 30V to the terminals where the battery would normally be connected, the LED's should turn on.


Then the BMS can be used as replacement:

 

[Batteryrepair]

A suitable replacement for Bosch schottky repairs is the following:

SK36SMA DO-214AC 60 V​

​

 

[Comrade]

Broken is a poor choice of words when it comes to this problem. Faulty is much better. Faulty diode. As there is clearly no physical damage.

The big question is why it fails? Bad circuit design? It's highly unlikely that the diode is not living up to the specs.