Procedure for operating an electrical energy storage unit and also corresponding apparatus, computer program, machine-readable storage medium and electrical energy storage unit

An apparatus (32) for operating an electrical energy storage unit, comprising an electronic control unit, the electronic control unit configured to

• ascertain, via a current sensor, a current magnitude which represents an electrical current which flows into or out of the electrical energy storage unit
• ascertain, via a voltage sensor, a first voltage magnitude which represents an electrical voltage which is present between two pole terminals of the electrical energy storage unit
• ascertain a second voltage magnitude which represents an electrical voltage and is obtained from the mathematical model of the electrical energy storage unit, where the mathematical model is loaded with the current magnitude;
• check for a predefined first condition which represents an accuracy of a mathematical model of the electrical energy storage unit, the predefined first condition including a quantitative deviation of the second voltage magnitude from the first voltage magnitude of less than 20 mV;
• check for a predefined second condition which represents a use of the electrical energy storage unit, where the predefined second condition for the representation of the use is at least one selected from the group consisting of a state of charge value in the range from 30% to 80%, a temperature value over 20° C., and an age value of fewer than 180 days;
• in response to the predefined first condition and the predefined second condition being satisfied, ascertain a value of a parameter of the mathematical model and change the value of the parameter in the mathematical model;
• and
• operate the electrical energy storage unit with the changed mathematical model.

A non-transitory, machine-readable storage medium containing instructions that when executed by a computer cause the computer to

• ascertain, via a current sensor, a current magnitude which represents an electrical current which flows into or out of the electrical energy storage unit
• ascertain, via a voltage sensor, a first voltage magnitude which represents an electrical voltage which is present between two pole terminals of the electrical energy storage unit
• ascertain a second voltage magnitude which represents an electrical voltage and is obtained from the mathematical model of the electrical energy storage unit, where the mathematical model is loaded with the current magnitude;
• check for a predefined first condition which represents an accuracy of a mathematical model of the electrical energy storage unit, the predefined first condition including a quantitative deviation of the second voltage magnitude from the first voltage magnitude of less than 20 mV;
• in response to the predefined first condition being satisfied, ascertain a value of a parameter of the mathematical model and change the value of the parameter in the mathematical model;
• and
• operate the electrical energy storage unit with the changed mathematical model.

An electrical energy storage system (30), comprising at least one electrical energy storage unit and an apparatus (32) including an electronic control unit, the electronic control unit configured to

• ascertain, via a current sensor, a current magnitude which represents an electrical current which flows into or out of the electrical energy storage unit
• ascertain, via a voltage sensor, a first voltage magnitude which represents an electrical voltage which is present between two pole terminals of the electrical energy storage unit
• ascertain a second voltage magnitude which represents an electrical voltage and is obtained from the mathematical model of the electrical energy storage unit, where the mathematical model is loaded with the current magnitude;
• check for a predefined first condition which represents an accuracy of a mathematical model of the electrical energy storage unit, the predefined first condition including a quantitative deviation of the second voltage magnitude from the first voltage magnitude of less than 20 mV;
• in response to the predefined first condition being satisfied, ascertain a value of a parameter of the mathematical model and change the value of the parameter in the mathematical model;
• and
• operate the electrical energy storage unit with the changed mathematical model.