How does the lithium-ion battery protection board work?

We all know that the lithium-ion battery we use is actually composed of several small lithium-ion batteries connected in parallel. There are several plastic-like plates separating them in the gaps between the internal lithium-ion batteries. These small plastic boards are actually lithium-ion battery protection boards. In fact, the lithium-ion battery protection board is not made of plastic. It is composed of several non-conductive fiberboards wrapped with a layer of oil. We all know that oil is non-conductive, which is why the lithium-ion battery protection board can isolate several lithium-ion batteries and prevent short circuits in the circuit. Secondly, we talked about the lithium-ion battery protection board also has the function of protecting the battery and preventing the battery from overcharging. When the external power supply continues to charge the battery quickly, the lithium-ion battery protection board will be used for protection. When the internal power of the lithium-ion battery reaches the saturation level, the internal circuit of the lithium-ion battery protection board will automatically cut off the external fast charging power supply . So that the external power source cannot enter the battery. This is exactly the principle that the lithium-ion battery protection board protects the battery from overcharging. We also went to the lithium-ion battery protection board to protect the lithium-ion battery and prevent the over-discharge of the lithium-ion battery. When the lithium-ion battery is over-discharged, the internal memory content of the lithium-ion battery will undergo a qualitative change. At this time, the lithium-ion battery protection board can sense this, so as to quickly cut off the discharge power so that the lithium-ion battery will not be damaged. All the electricity is discharged, thereby ensuring the stability of the internal current of the lithium-ion battery and preventing the over-discharge of the lithium-ion battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.