What is the testing method for the protection board of lithium battery pack?

Many people don’t know the purpose of lithium battery protection board. Lithium battery protection board, as the name suggests, is used to protect lithium battery packs. The purpose of lithium battery protection board is to protect the battery from over-discharge, over-charge, over-current, and output short-circuit protection. . The specific purpose of the protection board The lithium battery protection board is mainly used to protect the charging and discharging of the lithium battery pack. When fully charged, it can effectively ensure that the voltage difference between each single lithium battery is less than its set value, realize the balanced charging of each single battery of the lithium battery pack, and effectively improve the charging of the lithium battery pack composed of series and parallel. effect. At the same time, the protection board can also detect the overvoltage, undervoltage, overcurrent, short circuit, and overtemperature status of each single lithium battery in the lithium battery pack. After detecting these conditions, the protection board can adjust and warn in time. The protection board can Effectively protect and extend the service life of lithium battery packs. The purpose of undervoltage protection is to prevent a single lithium battery in the lithium battery pack from being damaged due to over-discharge during discharge. The protection board quality detection method 1. The function of the protection board of the lithium battery packs processed by different manufacturers of the detection circuit is not necessarily the same. Some protection boards are designed with thermistors to protect the lithium battery pack from overheating. The thermistor on the protection board only supplies a temperature sensor to the external circuit. If the protection board circuit is in poor contact, the lithium battery is easily damaged. Therefore, checking the circuit of the protection board is an important first step for us to detect the protection board. Second, the cable should be checked by a multimeter to determine the correctness of the cable connection. Press the B-line terminal with the black test pen of the multimeter and the B1 line terminal with the red test pen of the multimeter to obtain the first battery voltage. In this way, all series and parallel batteries in the lithium battery pack are measured. If the cable connection is correct, and the power supply difference of all battery strings is less than a certain value, it means that the protection board is used to ensure the consistency of all batteries in the lithium battery pack. 3. Measure the voltage After measuring the voltage of the lithium battery pack to confirm that it is normal, plug the cable into the protection board and measure the resistance between the ports on both sides of the protection board. If the resistance is zero, it means that the lithium battery pack is unblocked before the protection board. Has a very good use. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Do you know what is important for the correct use of lithium batteries?