What should I do if the internal resistance of the lithium battery protection board increases?

With the modernization of the times, the rapid development of the electric industry has brought spring to the lithium battery industry, and the lithium battery protection board, which is the core component of the lithium battery, has also ushered in unprecedented development. This is not only a lithium battery protection board. An opportunity for the industry is also a challenge. The protection board, as the name suggests, is to protect the lithium battery, with main protection functions such as overcharge protection, overdischarge protection, overcurrent protection, and short circuit protection. Now that the lithium battery protection board is part of people's lives, it is urgent for us to understand some other knowledge. Today, the Chinese Chuangfa will learn with everyone what to do when the internal resistance of the lithium battery protection board increases? What kind of solution is there? We discuss as follows:

1. Since the internal resistance of MOS is relatively stable and the internal resistance becomes larger, the first thing to suspect should be the components that are relatively easy to change such as FUSE or PTC.

2. If the resistance of FUSE or PTC is normal, check the resistance of the via hole between the P+, u200bu200bP- pad and the component surface according to the structure of the protection board. The value is larger.

3. If there is no problem with the above, you must suspect whether the MOS is abnormal: first determine whether there is a problem with the welding, and secondly, the thickness of the board (whether it is easy to bend), because the bending may cause the pin If the welding place is abnormal, put the MOS tube under a microscope to observe whether it is broken; finally, use a multimeter to measure the resistance of the MOS pin to see if it is broken down.

The above is a few methods provided by Chuangfa for you to detect when the internal resistance of the lithium battery protection board becomes large. I hope to help you.