Hello,

I am developing a high voltage BMS which will have isolation resistance measurement, high voltage measurement, current measurement and etc. Is it necessary to use isolation amplifiers and relays. What is the benefit of maintaining isolation between a high voltage system and a low voltage system. Are there any standards that would require this function (IEC62477 for example). A battery with BMS would be used with solar panels and inverters.

thank you!

 

high-voltage battery management system (BMS)

 

If the high voltage is charging a low voltage battery, then I think a transformer is the only practical way to isolate them.

Please give us a block diagram at least so we have some idea of what you are trying to do.

 

How much voltage?
https://www.ti.com/lit/fs/slyy102a/slyy102a.pdf?ts=1740649099993
Isolation in solar power converters: Understanding the IEC62109-1 safety standard

If all the measurements are digitized that makes the task of isolation easier.

Example test sheet for a PV device:
https://en.eastups.com/u/cms/en/202006/03165629v091.pdf

 

Isolation is good for more than one reason.
Some battery projects are under 48 V and isolation is not critical for safety.
For the car projects, have used 400V or 800V batteries. That will kill you.
Even on 12V batteries there can be large differences in ground voltages. To measure the battery accurately, you need to measure right at the battery not down the line. Isolation helps that.

 

The short answer is "YES, Isolation is required".
BUT the TS provides not nearly enough information to allow any more detailed advice to be provided. And certainly the measurements mentioned will require additional descriptions so that suggestions as to what would be isolated from what can be described.