What is the mobile phone lithium battery protection board? What kind of functions does it have?

Mobile phone lithium battery protection board battery protection board, as the name suggests, lithium battery protection board is mainly an integrated circuit board for rechargeable (generally referred to as lithium battery) for protection purposes. The reason why lithium battery (rechargeable type) needs to be protected is determined by its own characteristics. Since the material of the lithium battery itself determines that it cannot be overcharged, overdischarged, overcurrent, short circuited, and ultra-high temperature charging and discharging, the lithium battery components of the lithium battery will always appear with a protection board with a sampling resistor and a current fuse. Meaning The protection function of lithium battery is usually completed by the protection circuit board and current devices such as PTC or TCO. The protection board is composed of electronic circuits, which can accurately monitor the voltage and charge of the battery cell at all times under the environment of -40℃ to +85℃. Discharge the current of the loop to control the on and off of the current loop immediately; PTC or TCO prevents severe damage to the battery in high temperature environments. The protection board usually includes control IC, MOS switch, JEPSUN precision resistor and auxiliary device NTC, ID memory, PCB and so on. Among them, the control IC controls the MOS switch to turn on under all normal conditions, so that the cell communicates with the external circuit, and when the cell voltage or loop current exceeds the specified value, it immediately controls the MOS switch to turn off (tens of milliseconds). Protect the safety of batteries. Lithium battery protection board function 1. Overcharge protection 2. Over discharge protection 3. Over current and short circuit protection. The solution after the phone battery starts protection (from the network): 1. Use the original direct charge to charge the phone directly. Automatically open the protection circuit of the battery protection board. 2. Instantly short-circuit the positive and negative electrodes of the battery and see sparks on the electrodes. Try a few more times, and then use direct charging. 3. Find a 5V direct current, lightly touch the positive and negative poles of the battery with the positive and negative poles, try several times, and then use the original charger to charge. 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: What should I pay attention to when assembling polymer lithium battery cells?