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|1. (WO2017153317) STORAGE SYSTEM FOR STORING ELECTRICAL ENERGY|
|Applicants:||BOS BALANCE OF STORAGE SYSTEMS AG
|Title:||STORAGE SYSTEM FOR STORING ELECTRICAL ENERGY|
The invention relates to a storage system (10) for storing electrical energy, having at least one first energy store (11) and having at least one second energy store (12) which have a different cycle life and/or charging and discharging characteristic and are connected to at least one electrical load (18; 19) for discharging and are connected to at least one energy source (16) for charging by means of a parallel circuit. For a simplified storage system in which a first battery and at least one second battery are interconnected for the purpose of making optimal use of the advantages of both batteries, according to the invention the second energy store (12) has a slightly higher nominal voltage than the first energy store (11), in particular a nominal voltage in the range of the charging voltage of the first energy store (11), as a result of which the second energy store is discharged with priority, and a voltage gradient is additionally maintained between the first energy store (11) and the second energy store (12) by means of a circuit (20; 30; 40; 50; 60) or current limitation (46), in particular by means of one or more semiconductors (43; 53; 44; 54; 61; 62) or by means of a PTC thermistor (46), in order to charge the first energy store with priority or to protect or control the second energy store (12). A plurality of these storage systems (10) can be connected in series to form a total system (100) in which the state of charge of different first energy stores can be equalized by means of the second energy stores and additional equalization currents between the storage systems (10).