What may be the reason why the lithium battery does not last well?

This year’s strongest cold air continues to arrive. The battery life of various electric products seems to be passive. RND electric scooters also show examples of decreased battery life. Consumers who don’t know the truth may suspect that they have been scammed, and only buy a few. The battery life has shrunk so much every month. What's the reason? The main influence of temperature is that most electric mobility tools use lithium batteries with the model number of 18650. Among them, 18 claims a diameter of 18mm, 65 claims a length of 65mm, and 0 claims a cylindrical battery. All lithium ions in the lithium battery are stored in the positive electrode, while the negative electrode is composed of graphite (carbon). The electrolyte and diaphragm are included between the positive and negative poles. The discharge process of the lithium battery is the movement process of lithium ions from the negative electrode to the positive electrode, and the discharge of the lithium battery provides the electric energy required for operation of the electric vehicle. When the temperature drops, the charging and discharging process will slow down. Therefore, the discharge current becomes smaller, and the battery capacity becomes smaller. The stated operating temperature of the lithium battery is 0-40℃, but in fact, when the temperature is lower than 25℃, it will show a certain degree of performance degradation: the battery capacity decreases, the discharge speed becomes slower, and the battery output power decreases. As shown in the figure, the lithium battery can reach the maximum capacity value at 25°C, which is the test temperature in various cruising range tests. In fact, the data is slightly different due to differences in materials and processes of lithium batteries. A simple and rude calculation method for broadcasting on the Internet: Taking 25°C as the standard, for every 1°C drop in temperature, the electric capacity will drop by about 1%. In other words, a car that can run 20 kilometers in summer (25~28°), under the condition of 5° in winter, only considers the battery element, you can only run 15 kilometers at most. The drop in battery life caused by temperature is reversible. When the temperature rises, the car's battery life will recover from the beginning. This shows that electronics are the same as people, so they don’t want to move in winter. 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: There are many types of batteries. Which battery is better for RVs?