What is the role of SMD NTC Thermistor in the charge and discharge of lithium batteries？

The function of NTC thermistors is to monitor and protect the internal temperature of lithium batteries during the charging and discharging process, thereby improving the safety and service life of lithium battery products.

NTC thermistors, as a new type of material, have absolute advantages in cost-effectiveness.

With the popularity of smartphones, users have increasingly high requirements for batteries in their phones, and consumers are pursuing higher currents and longer working hours. At the same time, there is also a strong demand for products with small volume and light weight. Batteries account for a considerable proportion of the volume and weight of any device, so manufacturers are very careful to reduce their volume and weight. These requirements have prompted battery manufacturers to shift towards using new chemical materials such as nickel hydrogen and lithium-ion to achieve higher power density, lighter weight, and faster charging speeds. These features, especially fast charging, have added complexity. The new type of battery requires a precisely controlled charging circuit, which not only ensures that it is fully charged, but also maximizes its service life and prevents potential hazards under overheating conditions. Lithium ion batteries typically use a constant current constant voltage scheme, which still requires temperature monitoring to allow for fast charging, and a mechanism to ensure that charging stops when the temperature exceeds a safe threshold, which requires the use of NTC thermistors.

During the charging process of lithium batteries, the protective effect of NTC thermistors is mainly reflected in the following aspects: · Detecting temperature changes during the charging process· Detect the ambient temperature and allow for fast charging· Detected abnormal current causing battery heating· Perform residual energy display, voltage measurement, temperature compensation. From this, it can be seen that during the use of lithium batteries, the use of NTC thermistors can ensure the battery's service life, without causing damage to the battery itself due to overcharging or discharging, and at the same time, safety is also guaranteed. The NTC thermistor temperature sensor is a crucial component of lithium battery charging and safety.