BMS - Battery Management System

[ezjob]

If the BMS goes bad will I have to replace the battery too, or Can I just replace the BMS on the Slate truck?

I heard that Tesla makes you replace the battery and the BMS when it fails. That's very expensive.

 

[Paul]

Everything Tesla does is kind of expensive and proprietary And they don't want you working on it. Since slate does want you working on it, I'm guessing we're going to find out how this system works without out the Cloak and Dagger. Pretty much any new vehicle has some type of battery management system but I've never heard of replacing it with the 12-volt battery. On the Maverick hybrid You replace the 12 volt battery and then recalibrate the system Which you can do yourself. You would have to guess there would be some type of calibration of a BMS When you replace the 12-volt.

 

[Ivessm]

Everything Tesla does is kind of expensive and proprietary And they don't want you working on it. Since slate does want you working on it, I'm guessing we're going to find out how this system works without out the Cloak and Dagger. Pretty much any new vehicle has some type of battery management system but I've never heard of replacing it with the 12-volt battery. On the Maverick hybrid You replace the 12 volt battery and then recalibrate the system Which you can do yourself. You would have to guess there would be some type of calibration of a BMS When you replace the 12-volt.

I'de guess that the OP was talking about the HV battery replacement not the LV battery replacement.

 

[Paul]

I'de guess that the OP was talking about the HV battery replacement not the LV battery replacement.

Oh maybe your right. HV and LV would both have a battery management system. I would think if you were going to the effort to replace the HV battery And the expense and not writing off the vehicle near end of life (out of warranty) It might have gone down because of the BMS So could be with it? It's kind of like replacing an engine on a car with 300,000. You kind of guess the transmission might be next or also bad.

 

[cadblu]

You might want to check out this thread;

Will Slate have an easily replaceable battery?

 

[WA8YXM]

Lead acid do not generally have a BMS. just a regulator that' s part of the alternator
Advanced chemistry batteries like the LiFePO4 behind me have a BMS this controls the charging. helps with balance of cells in theory prevents charging if too hot or cold and assorted other charge related functions. It's bolt on. First I have to tell you I know these guys (well 2 of them) But since they are not selling anything .... I copied the video at the time.. Some may want to start at the beginning but

Tommy builds his own LiFePO4 battery and shows you how the BMS is connected.

 

[Letas]

BMS's are easy to swap. That is, once you have the battery disconnected and dropped and were able to order the BMS from the MFG. Which is much harder.



However, BMS swaps are not generally recommended as it is really easy to screw it up and brick the battery. That being said, BMS issues are covered under the 8y/100k mi warranty.



Really it will come down to - will Slate sell their BMS? And do you have the equipment to drop a pack. If both are yes, super doable.

 

[beatle]

It can also be difficult to tell whether the BMS itself has failed, or one of the sensors or wires that feed into it. In reality, the BMS doesn't really fail that often, but the errors start with "BMS_" make it seem like the BMS is the culprit. The BMS is just the messenger, and you're not supposed to shoot/replace them.

 

[AZFox]

In reality, the BMS doesn't really fail that often, but the errors start with "BMS_" make it seem like the BMS is the culprit. The BMS is just the messenger, and you're not supposed to shoot/replace them.

I remember getting a nice OBD Reader and telling my mechanically-inclined friend about it. He then schooled me about the prevalence of "second-order failures". I was a bit crestfallen, but still happy to have the tool.

An OBD second-order failure refers to a situation where the On-Board Diagnostics system detects a problem that is not directly related to the primary issue but is a consequence of it. This type of failure often complicates diagnostics, as it may mask the original fault that triggered the warning.​