Explanation of Used Terms
Term | Explanation |
|---|---|
Battery | A battery for the purposes of this document consists of at least one battery cabinet with one battery management system and a number of battery modules. Depending on the system configuration, up to four battery cabinets can be wired to form a battery. |
Battery management system (BMS) | Central processing unit of the battery cabinet (Accelerated Processing Unit, APU). |
Dynamic Battery Optimizer | The Dynamic Battery Optimizer (DPO) assembly is part of the battery management system. The DPO assembly controls and monitors the charging and discharging of the battery cells. |
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. The manufacturer defines battery limit conditions, at which the system terminates charging and discharging. |
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 fault, 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. |