Blog - BMS Systems

It is possible to change the voltage levels (thresholds) for the SBM settings?

• No, it is not possible. The SBM boards are sold as they are. There is no way for users to change the voltage level settings. (For large quantity orders - 100 pcs and more - it may be possible to design a custom setting version of the SBM boards.)

Is it possible to use the SBM for 12 cells with less cells (e.g. only 8 cells or 9 cells)?

• No, it is not possible. The board must be used with the exact number of cells. All cells must be connected; otherwise the board does not work properly. (For large quantity orders - 100 pcs and more - it may be possible to design a SBM with a customer number of cells.)

After deep discharge, how to restore the function of the battery pack?

• First of all the SBM should be used only as a „last resort“ protection measure. This means you should monitor the battery pack and stop discharging before the voltage goes too much down. The SBM should not be used to replace such monitoring. 
• Secondly, if the pack gets discharged deeply and the SBM makes the protection, we suggest recharging the battery pack as soon as possible.
• In order to restore the function of the SBM, you need to disconnect the load. After the disconnection, the voltage of the cells may go up and the SBM function should get released.
• In some cases, the voltage may get too deep or the cells maybe misbalanced – in such cases you may need to recharge the cells first to restore the function of the SBM.

What about overcharge?

• The same rules apply to the overcharge protection. You should stop charging before the SBM cuts-off the battery pack. In case the overcharge protection disconnects the pack, you may need to wait for some time until the voltage of the cells drops down to allow the SBM to reconnect.

Does the SBM monitor the temperature?

• Some SBM models monitor the temperature of the high-current component to detect the high current over-discharge. However the SBM boards do not have any temperature sensors to monitor the temperature of the battery pack.

Warning: Please note that that the lithium cells need to be charged regularly if protective electronics like SBM are connected to the cells. The lithium cells need be charged to full before letting them stay unused for longer periods of time.