Operating method for a dual-voltage battery

An operating system for a dual-voltage battery of a vehicle, the system comprising:

• a first battery cell block and at least one additional battery cell block of the plurality of cell blocks connected in parallel in a first connection arrangement in order to provide a first voltage and in series in a second connection arrangement in order to provide a second voltage;
• and
• a battery electronic system comprising:
• a first parallel connection switch and a first series connection switch associated with the first battery cell block of the group of battery cell blocks to produce the parallel or series connection;
• and
• two second parallel connection switches and a second series connection switch associated with the at least one additional battery cell block of the group of battery cell blocks, the two second parallel connection switches being connected to opposite terminals of the at least one additional battery cell block of the group of battery cell blocks, wherein at least one terminal of the first battery cell block is connected to ground and an opposite terminal of the first battery cell block is connected to the first parallel connection switch of the first battery cell block,
• wherein in the first connection arrangement all of the parallel connection switches are closed and all of the series connection switches are open and in the second connection arrangement all of the parallel switches are open and all of the series connection switches are closed,
• wherein the second connection arrangement, in which the first battery cell block is connected in series with the at least one additional battery cell block of the group of battery cell blocks by closing the series connection switches, the first parallel connection switch of the first battery cell block is transferred either into a closed position or into an open position as a function of an operating state of the vehicle while maintaining all of the series connection switches closed,
• wherein in the closed position the first battery cell block of the group of cell blocks is connected in parallel with at least one third battery cell block, and
• wherein a measurement of current and/or voltage is carried out at a first terminal of the dual-voltage battery associated with the first voltage, and the first parallel connection switch is closed in the second connection arrangement when any of the following conditions are met:
• a current supplied at the first voltage is less than a first lower limit current;
• the current supplied at the first voltage is greater than a first upper limit current;
• the first voltage is less than a first minimum voltage limit;
• and
• an electrical load operated at the first voltage gives advance notice of an increased demand for current.