In the BMS there are a number of limits used to ensure the safe operation of the battery pack, including: voltage limits, temperature limits, current limits and minimum SoH for safe operation.
There are also a number of measurements used for safety diagnostics at cell level, including:
- Moving Average Voltage Deviation (MAVD)
- Relaxation delta Voltage (RdV)
- delta State Of Health (dSOH)
We have described these as part of the Battery Management System (BMS), but they are used in cell testing and end of the cell manufacturing line to determine cell faults and quality. The algorithms that turn raw cell measurements into these diagnostics are covered in more detail on the Battery Management System Algorithms page.
LGES [1] describe a few of the safety diagnostics that they use to enable safe operation of the battery pack.
There are a number of safety diagnostics applied at pack level, including:
References
- The Beginning of Commercial Vehicle Innovation, LG Energy Solution’s Automotive Batteries for Commercial Vehicles