The working principle of lithium battery protection board

With the development of the economy, electronic products have entered the homes of ordinary people. People’s demand for the use of electronic products is also getting higher and higher. With the higher and higher demand for the use of electronic products, people’s demand for lithium batteries is also getting higher and higher. Used in various electronic products. There have been more and more safety issues related to lithium battery charging and discharging and use. The lithium battery protection board and the lithium battery management system were born for the safety of lithium batteries.

The lithium battery protection board BMS can effectively prevent the lithium battery from overcharging, overdischarging and short circuit of the internal circuit. It is the lithium battery protection board.

We all know that the lithium battery we use is actually composed of several small internal lithium batteries connected in parallel. There are several plastic-like plates separating them in the gaps between the internal lithium batteries. These small plastic-like boards are actually lithium battery protection boards. In fact, the lithium 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 battery protection board can isolate several lithium batteries and avoid short circuits in the circuit.

Secondly, we talked about the lithium battery protection board also has the function of protecting the battery and avoiding battery overcharging. When the external power supply continues to quickly charge the battery, the lithium battery protection board will have a protective effect. When the internal power of the lithium battery reaches the saturation level, the internal circuit of the lithium 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 battery protection board protects the battery from overcharging.

The lithium battery protection board can protect the lithium battery and avoid the function of over-discharging the lithium battery. When the lithium battery is over-discharged, the internal memory content of the lithium battery will undergo a qualitative change. At this time, the lithium battery protection board can sense this and quickly cut off the discharge power so that the lithium battery will not discharge all the electricity. This ensures the stability of the internal current of the lithium battery and avoids the over-discharge of the lithium battery.

The main functions of the lithium battery protection board include the following:

1. Over-discharge protection: When your battery is about to run out, and the voltage reaches a required minimum value, the protection board will also be turned off and can no longer be discharged. Your phone will automatically shut down.

2. Overcharge protection: When you charge, when the voltage reaches the highest battery voltage (4.2V), the protection board will automatically power off and shut down, and you can no longer charge.

3. Short-circuit protection: When your battery is accidentally short-circuited, the protection board will automatically turn off within a few milliseconds and will no longer be energized. At this time, it will be fine if the positive and negative poles touch one. The mobile phone battery has a protective board, so you can use it with confidence.

4. Over current protection: When the battery is discharged (used), the protection board will have a maximum current limit (different mobile phones have different requirements), and the protection board will automatically shut down when the discharge exceeds this current.