What are the methods for testing the cycle life and quality of lithium batteries?

①The lithium battery is discharged at a constant current of 0.2C to the specified termination voltage (generally 3.0V) at an ambient temperature of (205) ℃, and then charged to the termination voltage (generally 4.2V) with a constant current of 0.2C. Switch to constant voltage charging (the charge termination current is generally 0.02C); ②Lithium batteries should be discharged to the specified discharge termination voltage at a constant current of 0.2C at an ambient temperature of (205)℃; ③Lithium batteries should be at (205) Cycle at an ambient temperature of ℃, and the battery should be left for no more than 1h between charging and discharging or discharging and charging; ④Lithium batteries should be discharged and charged in cycles according to steps ① and step ② until the discharge capacity is less than 70% of the rated capacity . Lithium battery quality inspection method 1. The fastest inspection method is to test the internal resistance and maximum discharge current. A good quality lithium battery has very small internal resistance and a large maximum discharge current. Use a multimeter with a 20A range to directly short the two electrodes of the lithium battery. The current should generally be about 10A, or even higher, and it can be maintained for a period of time. A relatively stable battery is a good battery. 2. Look at the appearance. The fullness of the appearance, such as a lithium battery of about 2000mAh, is relatively large. The workmanship is more delicate or the packaging is more plump. 3. Look at the hardness. The middle part of the lithium battery can be squeezed lightly or moderately with the hand. The hardness is moderate, and there is no soft squeezing feeling, which proves that the lithium battery is a relatively high-quality battery. 4. Look at the weight. Remove the outer packaging and feel whether the weight of the battery is heavy. If it is heavy, it is a high-quality battery. 5. During the live working process of the lithium battery, continue to discharge for about 10 minutes if the battery poles are not hot, it proves that the battery protection board system is perfect. Generally, the quality of lithium batteries with high-quality protection boards is better than ordinary lithium batteries. 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 article: What are the methods for activating the old and new lithium batteries?