1, the lithium battery protection board problem caused by the lithium battery charge is determined to be the lithium battery protection board problem, there are two simple methods, method one, without the protection board, directly charge the lithium battery PACK, that is, the lithium battery pack B and B- direct charging,
If it can be charged, that is, it can be guaranteed that the lithium battery pack is normal without the protection plate, but it cannot be charged after the protection plate, which shows that the protection plate of the lithium battery is faulty.
? Method two, replace the protection board, if you replace the new protection board, you can charge, but the old protection board can not be charged, it means that the protection board in the previous lithium battery pack is faulty.
If it is the problem of the lithium battery protection board, most of the charging MOS of the protection board is faulty, or the charging fuse is broken by a large current, or the IC of the lithium battery protection board is damaged.
? Solution: The lithium battery protection board failure, resulting in the lithium battery pack can not be charged, the most direct solution is to replace a new protection board.
If there is no completely new protection board, you can detect the specific fault point of the protection board, such as MOS tube, resistor, capacitor, IC, fuse and other components, detect the specific fault point of the protection board, and then correspondingly replace the components of the protection board, or PCB circuit, it can be solved