Function of NTC Temperature Sensor for Battery of Sweeper

With the rapid popularization of smart home appliances, sweeping robots have gradually entered thousands of households. It can automatically complete floor cleaning and mopping, becoming a cleaning assistant for modern families.However, the core that supports the long-term and efficient operation of the sweeper is the battery system. How to ensure the safety and life of the battery during long-term working or charging and discharging has become the key to the industry's attention. Behind this, the NTC temperature sensor plays an indispensable role.


 

1. Temperature Challenge of Sweeper Battery

Most sweepers use lithium batteries as energy storage units, which have the advantages of high energy density and long battery life. But at the same time, lithium batteries are extremely sensitive to temperature. Studies have shown that  20 °C-25 °C  is the operating temperature range of sweeper batteries. If the battery runs outside this range:

Overheating risk: The internal chemical reaction of the battery intensifies, and the electrolyte evaporates, which may lead to bulging or even thermal runaway;

The impact of overcooling: the battery capacity decays, and the discharge efficiency drops sharply, resulting in insufficient battery life of the sweeper;

Shortened life: Abnormal temperature will speed up battery aging and shorten the overall service life.

Therefore, real-time monitoring of battery temperature has become a necessary means to ensure the stable operation of sweepers.
 

2. Working principle of NTC temperature sensor

NTC (Negative Temperature Coefficient) temperature sensor is a component based on the principle of thermistor, which is characterized by rising temperature and resistance value. Using this feature, the sensor can convert the temperature change into a number and feed back to the sweeper control system, so as to realize intelligent temperature control.

In battery applications, NTC sensors are usually directly attached to the surface of the battery pack to monitor temperature changes in real time and form a linkage with the control system.
 

3. The role of NTC temperature sensor for sweeper battery

Intelligent temperature control

When the battery temperature rises beyond the safety threshold, the NTC sensor will send out a signal at the first time, and the control system will automatically charge the power or switch to the protection to avoid further heating.
 

Safety warning

In extreme cases, such as abnormal batteries, NTC sensors can trigger system power failure to prevent dangerous accidents such as bulging and fire.
 

life extension

By operating in the temperature range of the battery, the performance decay rate is significant, thereby prolonging the overall service life.
 

4. Suggestions for selection: epoxy head series NTC sensors

For battery pack temperature monitoring, it is recommended to use epoxy head series NTC temperature sensors. Its advantages include:

Convenient installation: It can be pasted on the surface of the battery through silicone, which is easy to operate;

High adaptability: the head size can be customized, and it can be flexibly adapted to different battery specifications;

High-precision monitoring: can accurately capture subtle changes in battery temperature;

Strong stability: stable performance in the long-term charging and discharging process.

With the continuous expansion of sweeper functions, the requirements for battery life and safety are also constantly improving. In the future, battery temperature sensing technology will be further upgraded:

Higher precision: upgraded to ± 0.1 °C level, supporting stricter safety control;

Intelligent linkage: deeply integrated with battery management system (BMS) to achieve full life cycle management;

Miniaturization: the requirement of thin and light sweeper design.

As the "battery guardian", NTC temperature sensor will play an important role in future smart home appliances.