Method for detecting electrical fault states of a removable battery pack and/or an electrical device that can be connected to the removable battery pack, and system for carrying out the method

A method for detecting electrical fault states of a removable battery pack and/or an electrical device that can be connected to the removable battery pack, comprising:

• measuring a charging or discharge current value using a first current measuring apparatus integrated in the electrical device;
• transmitting the measured current value as a converted voltage value to a first monitoring unit of the removable battery pack, the first monitoring unit integrated in the removable battery pack;
• determining, using the first monitoring unit, based on the transmitted converted voltage value, whether the removable battery pack is operating in a permissible operating range;
• terminating or reducing a charging or discharging process of the removable battery pack using a second monitoring unit integrated in the electrical device and signaling a fault state of the removable battery pack using a display of the removable battery pack when the removable battery pack is operating outside of the permissible operating range;
• and
• adjusting an amplifier circuit integrated in the removable battery pack, using the first monitoring unit, to amplify the converted voltage value, such that when the converted voltage value is outside of a corresponding measurement range, an amplified voltage value within the measurement range is generated by the amplifier circuit.

A system comprising:

• a removable battery pack including a first monitoring unit, a measuring amplifier, and a first electromechanical interface having a first plurality of electrical contacts;
• and
• an electrical device including a second monitoring unit, a first current measuring apparatus, and a second electromechanical interface having a second plurality of electrical contacts,
• wherein in each of the first and second plurality of electrical contacts (i) a first electrical contact is configured as an energy supply contact that can be supplied with a first reference potential, (ii) a second electrical contact is configured as an energy supply contact that can be supplied with a second reference potential, and (iii) at least one third electrical contact is configured as a signal or data contact for transmitting a charging or discharge current value measured using the first current measuring apparatus or a converted voltage value derived from the charging or discharge current value to the first monitoring unit,
• wherein the system is configured to detect electrical fault states of the removable battery pack and/or the electrical device, the system configured to:
• transmit the converted voltage value to the first monitoring unit;
• and
• determine, using the first monitoring unit, based on the transmitted converted voltage value, whether the removable battery pack is operating in a permissible operating range,
• wherein the measuring amplifier has an input side and an output side,
• wherein the input side is connected to the at least one third electrical contact, configured as the signal or data contact, of the first electromechanical interface,
• wherein the output side is connected to the first monitoring unit, and
• wherein the first monitoring unit is configured to adjust an amplification of the measuring amplifier of the removable battery pack to amplify the converted voltage value, such that when the converted voltage value is outside of a corresponding measurement range, an amplified voltage value within the measurement range is generated by the measuring amplifier.