Charge circuit for battery cells

A device for charging a battery system using a charging voltage source, the battery system having a plurality of individual voltage sources arranged in a series circuit, the device comprising:

• a plurality of bypasses assigned to the corresponding plurality of individual voltage sources in the battery system, wherein a charge current from the charging voltage source is supplied to the individual voltage sources via the corresponding individual bypasses as a function of the charge condition of the individual voltage sources;
• and
• a battery charging controller configured to provide a timed control of the plurality of bypasses for regulating the intensity of the current flowing through the plurality of voltage sources in the battery system.

A method for charging a battery system using a charging voltage source, the battery system having a plurality of individual voltage sources arranged in a series circuit, comprising:

• providing a plurality of bypasses assigned to the corresponding plurality of individual voltage sources in the battery system, wherein a charge current from the charging voltage source is supplied to the individual voltage sources via the corresponding individual bypasses as a function of the charge condition of the individual voltage sources;
• and
• providing a timed control of the plurality of bypasses for regulating the intensity of the current flowing through the plurality of voltage sources in the battery system, wherein the regulation of the current flowing through the plurality of voltage sources provides a substantially zero mean current through the plurality of voltage sources.