Analysis of the conventional performance detection methods of lithium batteries

1. Conventional product detection charging: use detection system/DC power supply to charge the battery, use 0.2C constant current and constant voltage charging, until the battery overflows; discharge: use detection system/load meter to discharge the battery, use 0.2C constant current discharge, Until the battery is discharged; internal resistance: use a high-precision internal resistance detector for internal resistance detection, and the contact point must be in good contact to get an accurate resistance value. The larger the battery capacity, the smaller the internal resistance; anyway, the battery capacity is relatively higher Smaller, the greater the internal resistance; and usually the internal resistance of the rate battery is small. Overcurrent: The battery integrated detector is used to detect the battery protection current of the finished battery, and whether the protection board can play the role of overcurrent protection. Short circuit: A special detector is used to detect whether there is a protection function for a battery short circuit. Usually, many protection boards cannot survive a short circuit when the relevant design experience is insufficient or the battery capacity is large. Generally, electronic engineer manufacturers can basically pass it, so choose The more regular manufacturers are basically no problem, or simply use the positive and negative poles to short-circuit directly, whether the battery still has current output, no current output, disconnect the load, restore the voltage and other normal functions, which proves that the battery has short-circuit protection. Capacity: 0.2C battery is used for charging and discharging, and the battery capacity reaches the nominal capacity. 2. In-depth detection of high temperature: Use 0.2C constant current and constant voltage to charge, after charging overflow, put it in a thermostat, adjust the temperature to 65℃ and leave it for 4H, use 0.2C constant current to discharge to the cut-off voltage to see if the capacity can reach the standard Weigh more than 85% of capacity. Low temperature: Use 0.2C constant current and constant voltage to charge, after overflow, put it in a low temperature box, adjust the temperature to -20°C and leave it for 4H, use 0.2C constant current to discharge to the cut-off voltage to see if the discharge capacity reaches the nominal capacity More than 60%. Cycle: Use 0.2C to charge and discharge 500 times at 25°C. Is the capacity stored above 80%? Drop: Standard drop equipment is used to detect whether there is any adverse reactions such as fire and combustion when dropped from 6 sides at a height of 1 meter. Normally, there is no fire, no explosion, no smoke, and no liquid leakage. Disclaimer: Some pictures and contents of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: How to do UN38.3 certification for lithium batteries?