Detailed use of lithium battery protection board and analysis of test methods for protection board quality

Detailed use of the protection board The lithium battery protection board is mainly used to protect the charging and discharging of the lithium battery pack. It can effectively ensure that the voltage difference between each single lithium battery is less than its set value when the battery is overcharged, 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 test the overvoltage, undervoltage, overcurrent, short circuit, and overtemperature status of each single lithium battery in the lithium battery pack. After these conditions are tested, the protection board can be adjusted and warned in time. The protection board can Effectively protect and extend the service life of lithium battery packs. The purpose of undervoltage protection is to guard against damage to a single lithium battery in the lithium battery pack due to excessive discharge during discharge. Test method of protection board quality 1. The functions of protection boards configured for lithium battery packs processed by different manufacturers of the test circuit are 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 the first important step for us to test the protection board. Second, the cable is used to determine the correctness of the cable connection with a multimeter. 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 string of 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 difference between the power sources of all the battery strings is less than a certain value, 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 unimpeded before the protection board. Has a very good use. There are still many things to pay attention to when testing the quality of the lithium battery pack protection board. For example, when measuring the voltage of each string of lithium batteries, the test leads must be placed correctly. If they are touched together, a short circuit will occur and smoke will occur. When connecting the protection board, be sure to connect the cable before inserting the protection board. If the cable is not connected and then plug in the protection board, the protection board may be burnt out. 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: What are the lithium battery solutions to un38.3 test items?