Monitoring batteries for a faulty, problematic, or critical state

A method for monitoring a battery cell, comprising:

• measuring a first value that corresponds to a current pressure prevalent inside the battery cell;
• determining a second value based on the first value and a relationship between pressure and temperature of the battery cell, wherein the second value corresponds to a current temperature of the battery cell;
• determining a state of the battery cell based on the second value;
• and
• measuring a third value that corresponds to a temperature in or on the battery cell, wherein:
• the first value and the third value are determined by two substantially mutually independent measurements,
• the determining of the state of the battery cell based on the second value comprises determining a difference between the second value and the third value,
• the determining of the state of the battery cell based on the second value comprises determining whether the difference or an absolute value of the difference is the same as or exceeds a second threshold value,
• the determining of the state of the battery cell based on the second value further comprises determining whether the second value is the same as or exceeds a first threshold value, and
• the state of the battery cell is regarded as assigned to:
• a first category if the second value is lower than the first threshold value, and a second category if the second value is the same as or exceeds the first threshold value, or
• the first category if the difference or the absolute value thereof between the second value and the third value is lower than the second threshold value, and the second category if this difference or the absolute value thereof is the same as or exceeds the second threshold value, or
• the first category if both the second value is lower than the first threshold value and the difference or the absolute value thereof between the second value and the third value is lower than the second threshold value, and otherwise the second category.