The relationship and function of mobile phone lithium battery protection board and mobile phone lithium battery

Author: Chao Li Yang Pageviews:74 Time:2020-05-09

In the mobile phone lithium battery industry, the professional name for the mobile phone lithium battery maintenance board is BMS. The mobile phone lithium battery maintenance board is composed of electronic components and pcb. It mainly plays a role in charging and discharging the mobile phone lithium battery, which is equivalent to the battery management system. When the mobile phone lithium battery is fully charged, the mobile phone lithium battery maintenance board can ensure that the voltage difference of the battery is less than the set value, realize the balanced charging of the battery, and improve the charging effect of the mobile phone lithium battery. It can also detect battery status, such as overvoltage, overcurrent, overtemperature, undervoltage, short circuit, etc., to extend battery life and avoid damage to mobile phone lithium batteries due to overcharge and overdischarge. In general, the mobile phone lithium battery maintenance board and the mobile phone lithium battery are the relationship between maintenance and being maintained.

The finished mobile phone lithium battery is composed of two parts: the battery cell and the battery maintenance board. The battery cell is used as the power storage part. The decision is the quality of the mobile phone lithium battery. The mobile phone battery maintenance board is used to maintain the mobile phone lithium battery Flow, no release, no short circuit, the two are indispensable.

   Because of the characteristics of the mobile phone lithium battery itself, it is determined that a maintenance board with a sampling resistor and a current fuse must appear in the lithium battery component. In normal use, the mobile phone lithium battery undergoes a chemical positive reaction that converts electrical energy and chemical energy into each other. When the mobile phone lithium battery is overcharged, over-discharged, or over-current, a chemical reaction may occur inside the battery. After the response surpasses the positive response, the function and service life of mobile phone lithium batteries will be severely affected. Therefore, there must be a mobile phone battery maintenance board inside the mobile phone lithium battery to monitor the battery status.

  Mobile phone lithium battery maintenance board is composed of maintenance IC, pcb, capacitor, resistor, diode, triode and MOS tube. The maintenance IC is the core device in the mobile phone lithium battery maintenance board, which can timely control the MOS tube switch to maintain the function of the mobile phone lithium battery. The working mechanism of the mobile phone lithium battery maintenance board is as follows:

   Overcharge maintenance: When the voltage of the battery pack is greater than the maximum value and the maintenance delay is reached, the maintenance IC controls the CMOS to turn off the charging circuit.

   Over-discharge maintenance: When the battery pack voltage is less than the maximum value and reaches the maintenance delay, the maintenance IC controls the CMOS to turn off the discharge circuit.

  Over-current and short-circuit maintenance: When the output current of the battery pack P+ and P- exceeds the over-current/short-circuit current value and reaches the over-current/short-circuit delay, the control circuit controls the discharge CMOS to turn off the discharge circuit and stop the discharge.

  High and low temperature maintenance: When the temperature sensor reaches the temperature threshold, when the maintenance delay is reached, the control circuit turns off the MOS tube to stop charging and discharging.

  Mobile phone lithium battery maintenance board can also detect power, display battery working status and battery remaining. In addition, there are different classification methods for mobile phone lithium battery maintenance boards, which can be divided into: raw materials, combinations and functions:

  1. Raw materials: mobile phone lithium battery maintenance boards are divided into five types of base boards: rigid boards, flexible boards, single-layer boards, double-layer boards, and multi-layer boards. Among them, the hard board is the most commonly used one.

  2. Combination: According to the different series and parallel methods of mobile phone lithium battery, the mobile phone lithium battery maintenance board can be divided into two types: series and parallel. Lithium batteries connected in series can increase the overall voltage of the battery, and lithium batteries connected in parallel can increase the overall capacity of the battery.

  3. Function: According to the function of mobile phone lithium battery charging and discharging, the mobile phone lithium battery maintenance board can be divided into single function and two-way function. One-way means that only overcharge maintenance or overdischarge maintenance is performed on the battery. Two-way means that the maintenance board can have both overcharge and overdischarge functions together. The two-way mobile phone lithium battery maintenance board is more widely used.


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