Voltage monitoring module and voltage monitoring system to detect a current leakage

A battery management device comprising:

• a first terminal configured to detect a voltage of a first external electrode of a battery cell via a first path;
• a second terminal configured to detect a voltage of a second external electrode of the battery cell via a second path;
• a third terminal configured to couple with the first external electrode via a third path;
• a fourth terminal configured to couple with the second external electrode via a fourth path;
• a first transistor, a second transistor, a third transistor, and a fourth transistor respectively coupled to the first terminal, the second terminal, the third terminal and the fourth terminal, the second transistor configured to short-circuit the second terminal and the third terminal;
• a voltage measurement circuit configured to detect:
• a first potential difference between the first path and the second path;
• and
• a second potential difference between the third path and the fourth path;
• and
• a control circuit configured to detect a current leakage among the first path, the second path, the third path, and the fourth paths by comparing the first potential difference and the second potential difference.

A battery control device comprising:

• a first terminal configured to detect a voltage of a first external electrode of a battery cell via a first path;
• a second terminal configured to detect a voltage of a second external electrode of the battery cell via a second path;
• a third terminal configured to couple with the first external electrode via a third path;
• a fourth terminal configured to couple with the second external electrode via a fourth path;
• a transistor configured to short-circuit the second terminal and the third terminal;
• a voltage measurement circuit configured to detect:
• a first potential difference between the first path and the second path;
• and
• a second potential difference between the third path and the fourth path;
• and
• a control circuit configured to detect a current leakage among the first path, the second path, the third path, and the fourth paths by comparing the first potential difference and the second potential difference.