The traditional battery capacity detection method is to perform a check discharge of the whole group, that is, connect the battery pack to the load box, and then discharge it until it is empty to verify the capacity of the battery, but this method has many hidden dangers. After years of research and application, it has been shown that internal resistance detection is one of the most reliable test methods at present, and different failure modes of the battery reflect different internal resistance. Understand the relationship between the internal resistance of the battery and various failure modes. The working state of the battery can be evaluated by measuring the internal resistance of the battery. It is conducive to better detection and maintenance of the battery, and has a great effect on prolonging the service life of the battery.
One of the important signs of the state of the battery is its internal resistance. Whether the battery is about to fail, insufficient capacity or improper charging and discharging, it can be reflected from its internal resistance change. At present, the common methods for measuring the internal resistance of batteries are: density method, open circuit voltage method, DC discharge method, AC injection method, and internal resistance tester method. Different test modes have different reflections on the performance of the battery. Below we think of the convenient and direct measurement method of the battery internal resistance tester, and learn how to judge the performance of the battery.