What is the correct detection method for lithium-ion battery standards

The specific steps are as follows: 1. The lithium ion battery is discharged at a constant current of 0.2C to a regular stop voltage (usually 3.0V) at an ambient temperature of (20±5) ℃, and then charged at a constant current of 0.2C to stop Voltage (generally 4.2V), switch to constant voltage charging (charging stop current is generally 0.02C); lithium-ion battery is discharged to a regular discharge stop voltage at a constant current of 0.2C at an ambient temperature of (20±5)℃ ; 2. Lithium-ion batteries should be stored in an open circuit at (40±2)℃ for 90 days; lithium-ion batteries should be charged at (20±5)℃ in accordance with step ①; lithium-ion batteries should be stored at (20±5)℃. Discharge at a constant current of 0.2C at an ambient temperature of ±5°C to a regular discharge stop voltage; calculate the capacity (Ah) discharged by the battery in step ⑤. The charge recovery capacity after storage is indicated by the percentage of the calculated capacity compared with the extra capacity. 2. Cycle life detection The cycle life detection first checks the charge and discharge times of the lithium-ion battery when the available capacity drops to the allowable value. The specific steps are as follows: 1. The lithium ion battery is discharged at a constant current of 0.2C to a regular stop voltage (usually 3.0V) at an ambient temperature of (20±5) ℃, and then charged at a constant current of 0.2C to stop Voltage (generally 4.2V), switch to constant voltage charging (charging stop current is generally 0.02C); lithium-ion batteries should be discharged at a constant current of 0.2C at an ambient temperature of (20±5)℃ to a regular discharge stop Voltage; Lithium-ion batteries should be cycled at an ambient temperature of (20±5)℃, and the batteries should not be left for more than 1h between charging and discharging or between discharging and charging; 2. Lithium-ion batteries should be discharged in accordance with correct routines. And charge until the discharge capacity is less than 70% of the additional capacity. 3. Lithium-ion battery power monitoring method 1. Voltage measurement method means that the power of the battery is obtained by simply monitoring the voltage of the battery. Advantages of this method: simple defects: inaccurate, the accuracy of power measurement is only more than 20%. Especially when the battery power is less than 50%, the power calculation of the mobile phone will become very inaccurate. Therefore, the protection of the battery by this method is often limited. 2. Battery modeling method This method is to establish a data table based on the discharge curve of the battery, and the power value under different voltages will be indicated in the data table. Strengths: It is more accurate than the voltage test method. Defects: It is not easy to obtain an accurate data sheet because the relationship between voltage and power also involves factors such as battery temperature, self-discharge, and aging. 3. Coulomb counter Coulomb counter is a current check resistor in series between the positive and negative poles of the battery. Vsense will occur when current flows through the resistor, and the current flowing through the battery can be calculated after Vsense is detected. Strengths: The accuracy can reach 1%, which can reduce the influence of battery aging and other factors on the measurement results. Defects: In the use mode where the battery does not work for a long time. If the battery has not been used for a few days after being charged, or has not been fully charged for several charge and discharge cycles, the self-discharge phenomenon caused by the internal chemical reaction will become very significant. In this case, the measurement results will no longer be so accurate. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Analysis on the types of lithium-ion battery explosions