Introduce lithium battery discharge curve

The discharge curve refers to the curve of the voltage, current, and capacity of the battery over time during the discharge process. The information contained in the charge and discharge curve is very rich, including capacity, energy, working voltage and voltage platform, the relationship between electrode potential and state of charge, etc. in detail. The important data recorded during discharge detection is the time evolution of current and voltage, and many parameters can be obtained from these basic data. The basic principle of discharge detection: After knowing the voltage of the battery, we start to introduce the discharge curve of the lithium battery. The discharge curve basically reflects the state of the electrode, which is the overlap of the state changes of the positive and negative electrodes; during charge and discharge detection, the device applies a certain load to the battery, and records the evolution of the voltage with time and the current with time according to the set data recording conditions Evolution process. During the entire discharge process, the voltage curve of a lithium battery can be divided into three stages: 1. The battery voltage drops rapidly at the initial stage. The greater the discharge rate, the faster the voltage drops; 2. The battery voltage enters a stage of slow changes. This period of time is called the platform area of u200bu200bthe battery. The smaller the discharge rate, the longer the platform area continues, the higher the platform voltage, and the slower the voltage drop; 3. When the battery is nearly discharged, the battery load voltage begins to drop sharply. Reach the discharge cut-off voltage. When a lithium battery is discharged, its working voltage always changes with the continuation of time. Use the working voltage of the battery as the ordinate, discharge time, or capacity, or state of charge, or discharge depth as the abscissa, and draw it. The resulting curve is called the discharge curve. To understand the discharge characteristic curve of the battery, we must first understand the voltage of the battery in principle. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.