Common problems with lithium battery protection boards

大力神保护板

Common problems with lithium battery protection boards [Copy link]

The lithium battery protection board is composed of electronic components and PCB. It is a circuit board that is always ready to monitor the voltage of the battery cell and the current of the charging and discharging circuit under a certain temperature and humidity environment, and timely control the on and off of the current circuit. Since the lithium battery protection board is so important, we should understand some common problems of the protection board. The following Hercules protection board will explain to you the problem of large internal resistance of the protection board. The internal resistance of the MOS is relatively stable. If the internal resistance is large, you should first consider whether the internal resistance of the component FUSE or PTC is too large. If the resistance value of the component FUSE or PTC does not change, check the structure of the protection board to detect the resistance value of the via between the P+, P- pads and the component surface. The via may be slightly broken and the resistance value is large. If there is no problem with the FUSE or PTC, check whether the MOS is abnormal: first determine whether there is a problem with the welding; secondly, check the thickness of the board (whether it is easy to bend), because bending may cause abnormalities in the pin welding; then put the MOS tube under a microscope to observe whether it is broken; finally, use a multimeter to test the resistance value of the MOS pin to see if it is broken. If the internal resistance is still large, we need to use a probe to touch the protection board to see if it is in poor contact or over-oxidized. Secondly, we should also pay attention to whether there are too many nickel sheets on the battery cell. If there are too many nickel sheets on the battery cell, it will also cause the internal resistance to be too large. Choosing a well-known and dedicated lithium battery protection board manufacturer can avoid many similar problems. After years of development, Hercules protection board has a high reputation and strength in the field of lithium battery protection boards.

采样电阻

The lithium battery protection board uses alloy sampling resistors.