Method for Impedance-Controlled Fast Charging, Control Unit for a Charging System, Stored Energy Source, and Working Device

A method for impedance-controlled fast charging of a stored electrical energy source, the method comprising:

• detecting a variable characteristic of an impedance of the stored electrical energy source;
• setting a present charging current for charging the stored electrical energy source as a function of the variable characteristic of the impedance;
• temporarily reducing the present charging current with a steep edge by temporarily connecting a resistive load to the stored electrical energy source and feeding said resistive load using said stored electrical energy source;
• and
• detecting a voltage response of the stored electrical energy source to the steep edge as the variable characteristic of the impedance of the stored electrical energy source and using the voltage response as a basis for setting the present charging current.

A control unit for a charging system, comprising:

• a control chip and/or an ASIC arranged on or in a stored electrical energy source centrally or decentrally for one or more stored electrical energy sources,
• wherein the control unit is operatively configured to carry out the acts of:
• detecting a variable characteristic of an impedance of the stored electrical energy source;
• setting a present charging current for charging the stored electrical energy source as a function of the variable characteristic of the impedance;
• temporarily reducing the present charging current with a steep edge by temporarily connecting a resistive load to the stored electrical energy source and feeding said resistive load using said stored electrical energy source;
• and
• detecting a voltage response of the stored electrical energy source to the steep edge as the variable characteristic of the impedance of the stored electrical energy source and using the voltage response as a basis for setting the present charging current.