Method and apparatus for charging or discharging a battery system

An apparatus for charging or discharging a battery system, the battery system comprising at least two battery cells connected in parallel and/or in series, which can only be charged or discharged together, the apparatus comprising:

• a controller to control a voltage as a control variable via a current or a power as a manipulated variable, the current or the power being specified by taking into account a first state of charge-dependent characteristic curve and a second state of charge-dependent characteristic curve,
• wherein the first state of charge-dependent characteristic curve and the second state of charge-dependent characteristic curve have opposite gradients, at least in sections.

A method for charging or discharging a battery system that comprises a battery cell, the method comprising:

• controlling a voltage as a control variable via a current or a power as a manipulated variable;
• and
• specifying the current or the power taking into account a first state of charge-dependent characteristic curve and a second state of charge-dependent characteristic curve, the first state of charge-dependent characteristic curve and the second state of charge-dependent characteristic curve having opposite gradients, at least in sections.

Apparatus for charging or discharging a battery system comprising a battery cell, the apparatus comprising:

• a controller to control a voltage as a control variable via a current or a power as a manipulated variable, the current or the power being specified by taking into account a first state of charge-dependent characteristic curve and a second state of charge-dependent characteristic curve,
• wherein the first state of charge-dependent characteristic curve and the second state of charge-dependent characteristic curve have opposite gradients, at least in sections.