The critical value of an NTC (Negative Temperature Coefficient) thermistor of a li-polymer battery is its temperature coefficient, which measures how much its resistance changes with temperature. The temperature coefficient is negative for NTC thermistors, meaning their resistance decreases as the temperature increases.

This characteristic is typically expressed as a percentage change in resistance per degree Celsius. For example, a standard value might be -4.5%/°C, indicating that the resistance decreases by 4.5% for every 1°C increase in temperature.

Other important values for an NTC thermistor include:

Nominal Resistance

This is the resistance at a specific reference temperature, often 25°C. It’s a primary identifier for the thermistor, such as a 10K thermistor having a resistance of 10,000 ohms at 25°C.

B-Constant

This parameter describes the relationship between temperature and resistance over a specified range. It’s used in the Steinhart-Hart equation, a mathematical model to convert the measured resistance of the thermistor to temperature.

Thermal Time Constant

This is the time the thermistor takes to change 63.2% of the total difference when the temperature changes rapidly.

Dissipation Constant

This indicates how much power the thermistor can dissipate (in watts) to maintain its temperature above the surrounding temperature.

Operating Temperature Range

This is the range of temperatures over which the thermistor can accurately and safely operate. These values are crucial for selecting the suitable NTC thermistor for a particular application, especially in temperature sensing and control systems.

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