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Application of Thermistor Temperature Sensor in Electric Vehicle Battery

Application of Thermistor Temperature Sensor in Electric Vehicle Battery

Ⅰ. Understand the thermistor temperature sensor


There are many types of sensors used to measure temperature, and the thermistor temperature sensor is one of them. Many thermistors have a negative temperature coefficient (NTC), which means that their resistance will increase when the temperature drops. Among all passive temperature sensors, the thermistor has the highest sensitivity (that is, the change in resistance when the temperature changes by one degree), but the resistance/temperature curve of the thermistor is non-linear.


Thermistor temperature sensor has the advantages of accurate temperature measurement, high sensitivity and good stability. It is widely used in the fields of temperature detection and temperature compensation. With the popularization of artificial intelligence and the vigorous development of new energy vehicles, the NTC market has a very promising future. considerable.


Ⅱ. Application of thermistor temperature sensor in home appliances


In our daily life, in fact, there is more or less connection with the temperature sensor at all times. It can be said that life is completely inseparable from the thermistor temperature sensor. Basically all large and small home appliances that involve temperature control will be applied to the thermistor temperature sensor. For example, the most commonly used smart rice cookers, microwave ovens, washing machines, air conditioners, refrigerators and so on.


Ⅲ. Application of thermistor temperature sensor in electric vehicle battery


With the widespread application of new energy electric vehicles, battery capacity, safety, health and endurance have increasingly become the focus of attention. Temperature to the temperature of an electric vehicle battery is one of the important factors affecting the remaining power and service life of the battery. At present, only the surface temperature of the battery is generally measured. The thermistor temperature sensor is used to measure the surface temperature of the battery, which is attached to the surface of the car battery to measure the temperature. Generally, the appearance structure of the thermistor temperature sensor used in the car is generally divided into several types:


1. The appearance structure of the thermistor temperature sensor: metal fixed ring type head material: copper nickel plated material: 0.8mm metal thickness, with high melting point, high hardness, and bright surface; copper tin plated material: 0.8mm metal Thickness, but the melting point is not high enough, the hardness is not large, the surface is bright without copper nickel plating; stainless steel: 0.5-0.7mm thickness to prevent rust; pure nickel terminal: 0.2-0.3mm thickness, high hardness, convenient welding, light and thin.


2. External structure of thermistor temperature sensor: The head of the water droplet is encapsulated with epoxy resin. The temperature sensor encapsulated by epoxy resin is usually glued directly on the surface of the battery, so the temperature measurement effect may be worse than that of the metal fixing ring, and the stability is not high. Generally, this kind of head encapsulation is not used in high-end cars to measure the battery temperature.

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