What are the methods for detecting the performance of lithium batteries

Lithium battery is a product that requires high quality and high safety. Consumers often don't know the performance of the battery when using it. As a result, the efficiency of the battery during use is often not up to the ideal goal, and sometimes blind use can cause battery explosions. If it happens, the safety of life will also be damaged, so knowing the performance of the battery is also crucial. Lithium battery performance detection includes voltage, internal resistance, capacity, internal pressure, self-discharge rate, cycle life, sealing performance, safety performance, storage performance, appearance, etc., as well as overcharge, overdischarge, solderability, and corrosion resistance. Sex and so on. Method 1: Self-discharge detection The self-discharge detection of lithium batteries is: generally 24-hour self-discharge is used to quickly detect its charge retention capacity, discharge the battery at 0.2C to 3.0V, and charge at constant current and constant voltage to 4.2V at 1C. Current: 10mA, after 15 minutes of storage, discharge at 1C to 3.0V to measure the discharge capacity C1, then charge the battery at constant current and constant voltage 1C to 4.2V, cut-off current 100mA, and then stand for 24 hours and measure the 1C capacity C2, C2/C1 ×100% should be greater than 99%. Method two, internal resistance measurementThe internal resistance of a lithium battery refers to the resistance that the current flows through the battery when the battery is working. It is generally divided into AC internal resistance and DC internal resistance. Since the internal resistance of the rechargeable battery is very small, the internal resistance of the battery is measured. Since the electrode is easily polarized and polarized internal resistance occurs during resistance, its true value cannot be measured; and the AC internal resistance can be measured to avoid the influence of the polarized internal resistance, and the true internal value can be obtained. The method of AC internal resistance detection is: using the characteristics of a lithium battery equivalent to an active resistor, giving the battery a constant current of 1000HZ, 50mA, sampling its voltage, rectifying and filtering, etc. to accurately measure its resistance. Method 3. Drop detection After being overcharged, the lithium battery pack is dropped from three different directions on a hard rubber plate at a height of 1m. Do this twice in each direction. The battery pack's electrical performance should be normal and the outer packaging should not be damaged. Method 4: After the lithium battery is overcharged in the impact test, a 15.8mm diameter hard rod is placed on the battery, and a 20-pound weight is dropped from a height of 610mm on the hard rod. The battery should not explode. Fire or leakage. Method 5: Puncture test After the lithium battery is overcharged, use a nail with a diameter of 2.0mm~25mm through the center of the battery and leave the nail in the battery. The battery should not explode and catch fire. 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 should I pay attention to when using UPS batteries?