What should I do if the lithium battery protection board is short-circuited without protection?

Lithium battery protection board has been proved to be more and more important in today's electrical age. As the name implies, the lithium battery protection board is the protection of the lithium battery. It has the main protection functions such as overcharge protection, overdischarge protection, overcurrent protection, temperature protection, short circuit and so on. There are so many importance, then we understand its common sense. It is an urgent matter, and when we encounter problems, we can solve them easily. Today, Chuangfa will come with you to learn what to do if the lithium battery protection board is short-circuited without protection?

1. There is a problem with the VM terminal resistance: use a multimeter to connect one test lead to IC2 pin, and one test lead to the MOS pin connected to the VM terminal resistance to confirm the resistance value. Check whether the resistance and IC, MOS pins are soldered.

2. IC and MOS abnormality: Since the over-discharge protection and over-current and short-circuit protection share a MOS tube, if the short-circuit abnormality is due to a MOS problem, the board should have no over-discharge protection function.

3. The above are defects under normal conditions, and short-circuit abnormalities caused by poor IC and MOS configurations may also occur. For example, in the BK-901 that appeared in the early stage, the delay time in the IC with the model of ‘312D’ was too long, which caused the MOS or other components to be damaged before the IC took the corresponding action control.

Finally, Chuangfa Warmly reminds you that the easiest and most direct way to determine whether an abnormality occurs in the IC or MOS is to replace the suspected components.