What are the important parts of mobile phone lithium-ion battery?

The battery will not swell normally after being used for a long time. The reason for the swelling of the battery is that the charging time is too long. It will not affect the use, but the standby time will be shorter and shorter. The reason for the thermal expansion of the battery: the power consumption of the mobile phone a in standby mode is very small, which means that the equivalent load resistance of the battery is very large, so the discharge current is very small, so the battery does not heat up, and the internal power consumption of the battery is also very small. B mobile phone consumes a lot of power while waiting for a call or playing a game. That is to say, its battery has a smaller equivalent load resistance and a larger discharge current during operation. After the battery is discharged, the internal resistance increases. However, the current required by the mobile phone cannot be reduced. Then, a considerable part of the energy is consumed on the internal resistance of the battery, causing the battery to generate heat, accelerate the discharge, and rapidly shorten the battery's use time. Lithium-ion battery composition The plastic case of mobile phone lithium-ion battery is mainly composed of upper and lower cover, lithium-ion battery, circuit board protection (PCB) and recyclable fuse (polysilicon). Some manufacturers are also equipped with NTC, identification resistor, vibration motor or charging circuit components. The functions of each part are as follows: (1) Lithium-ion battery: Supply charge and discharge power. (2) Protect the circuit board (PCB): prevent the battery from overcharging and short circuiting. (3) Recoverable fuse (PTC): The positive thermistor is used for high temperature protection and is a double protection to protect the circuit board after failure. (4) Recyclable fuse (NTC): Negative thermistor, which senses the internal temperature of the battery for low-temperature protection. (5) Recognition resistance: It is important to recognize that the primary battery is not an unusable primary battery core, and there are several levels of action, including A cells and B cells. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Precautions for the use of lithium-ion battery products