Method and device for monitoring the state of health of a contactor

A method for monitoring a state of health of a contactor in a battery pack, comprising:

• (i) measuring a first differential voltage across a switchable first contactor in an open position;
• and
• (ii) monitoring a state of health of the switchable first contactor based on the measured first differential voltage, or
• (i) measuring a second differential voltage across a switchable second contactor in an open position;
• and
• (ii) determining a state of health of the switchable second contactor based on the measured second differential voltage,
• wherein the battery pack comprises:
• a battery cell configured to electrochemically store electrical energy;
• a first interface line and a second interface line, each interface line configured to deliver electrical energy to an interface;
• the switchable first contactor arranged in the first interface line between the interface and the battery cell;
• and
• the switchable second contactor arranged in the second interface line between the interface and the battery cell.

A method for monitoring a state of health of a contactor in a battery pack, comprising:

• (i) measuring a first differential voltage across a switchable first contactor in an open position;
• (ii) monitoring a state of health of the switchable first contactor based on the measured first differential voltage;
• (iii) measuring a second differential voltage across a switchable second contactor in an open position;
• and
• (iv) determining a state of health of the switchable second contactor based on the measured second differential voltage,
• wherein the battery pack comprises:
• a battery cell configured to electrochemically store electrical energy;
• a first interface line and a second interface line, each interface line configured to deliver electrical energy to an interface;
• the switchable first contactor arranged in the first interface line between the interface and the battery cell;
• and
• the switchable second contactor arranged in the second interface line between the interface and the battery cell.