What is the purpose of the mobile phone lithium battery circuit board? 50 point reward!

Introduction What is the purpose of the mobile phone lithium battery circuit board? 50 point reward! 1. This PCB is a protection board compared to PCM in the industry, it is designed to protect the battery from various charging and discharging environments.

What is the purpose of the mobile phone lithium battery circuit board? 50 point reward!

1. This PCB is a protection board, better than PCM in the industry. It protects the battery from various charging and discharging environments to avoid abnormal burning of the battery core. A general PCM has two basic components to protect the IC+MOS switch.

2. The protective plate and the battery core are connected by nickel sheets, which are welded using ultrasonic waves. Some nickel sheets are not tin-plated, so you may not be able to solder them. high temperature welding It can't be too long, it's best to do it within 10 seconds. Over time, it will affect the electrolyte inside the battery core, which will affect the life of the battery, and the risk of explosion is relatively small.

3. Of course, you can replace the circuit board of a discarded lithium battery, but if it is a different model of batterie lithium, it may not fit your phone due to the different output pins you can call. for battery repair. Can someone help you figure it out.

4. Wiring method: There are a P+ and a P- on the protection board, which are connected to the positive and negative poles of the battery respectively. If you have an aluminum shell battery, the negative pole. of the battery is the raised oval shaped cap, the positive electrode is the body of the battery core, and if it is a steel case battery, it is just the opposite.

5. If your lithium battery has this PCM protection, it can be charged directly with USB. The protection board itself protects the load against overcurrent, overvoltage and short circuit. But for battery life reasons, it is recommended to use the corresponding charger to charge.

LY4080B is a 5V input that supports a boost charge management application for two lithium batteries connected in series. Adopting switching voltage structure, S0P8 package with heat sink and low number of external components make LY4080B an ideal choice for portable applications. The input voltage of LY4080B is 5V, and the built-in adaptive loop intelligently adjusts the charging current to prevent the charger output from being lowered. Can work with USB power and adapter.

Thermal feedback can automatically adjust the load current to limit the chip temperature during high-power operation or high ambient temperature conditions. The charging voltage is fixed at 8.4 V, while the charging current can be adjusted externally via a resistor. When the charging current drops to 1/10 of the set value after reaching the voltagefinal floating ion, the LY4080B automatically ends the charge cycle.

When the input voltage (AC adapter or USB power supply) is removed, the LY4080B automatically enters a low current state, reducing the battery leakage current to less than luA. Other features of the LY4080B include undervoltage lockout, auto-recharge, and a charging indicator status pin.

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