Explanation of Used Terms
Term | Explanation |
|---|---|
Battery | A battery for the purposes of this document consists of at least one battery cabinet with an integrated high-voltage box and a number of battery modules. Depending on the system configuration, up to four battery cabinets can be wired to form a battery. |
High-voltage box | Assembly with controller (BCMU) and connections for battery modules and further components |
BCMU (Battery Control Management Unit) | Central Battery Management System of a battery cabinet, installed in the high-voltage box. |
LCU (Local Control Unit) | Control panel and control unit |
State of charge | The state of charge (SoC) indicates the amount of energy available in a battery, expressed as a percentage. A state of charge of 100% is equivalent to a fully charged battery. The battery management system is able to determine the state of charge of a cell or battery module based on parameters, and to terminate charging if required. This prevents overcharging of the battery. To prevent unnecessary stress on the cells, the software has the same function for discharging. Battery limit conditions, at which the system stops charging and discharging, are defined. |
State of health | The state of health (SoH) indicates the condition of a battery. By closely monitoring the state of health, the battery management system is able to identify disparities in power at cell level and in this way detect damaged or defective cells. Depending on the severity of the error, the battery inverter may become disconnected from the battery management system or the battery may be shut down. |
Balancing | Balancing is a battery management system function. It ensures that the charge is split evenly between all battery cells within a battery module, all battery modules within a battery cabinet, and all battery cabinets within a battery. |