Do you know 3 little knowledge about batteries
1. What is the (charge and discharge) rate?
It refers to the current value required when the battery discharges its rated capacity within a specified time, and its data value is equal to the multiple of the battery's rated capacity, that is, charge and discharge rate = charge and discharge current/rated capacity. It is usually represented by the letter C, which usually measures the speed of charging and discharging. When a battery with a rated capacity of 50Ah is discharged with 50a, its discharge rate is 1C, and when it is discharged at 100a, it is 2C. One of the methods for detecting battery capacity is to measure different discharge currents.
2. What is internal pressure?
Refers to the internal air pressure of the battery. Lithium batteries generate gas during the charging and discharging process. Materials, manufacturing processes, and structures will affect the gas production. The gas generated by the decomposition of water and electrolyte inside the battery will accumulate inside. High-rate overcharge will cause the internal reaction to be too fast, the temperature rises, and the internal pressure increases. This will have a serious impact on the performance and appearance of the battery.
Any form of charging of lithium batteries will cause serious damage to battery performance and even explosion. Lithium batteries are charged with constant current and constant voltage, which can protect the battery to the utmost extent.
3. Why do lithium batteries need to be stored for a period of time before they can be packaged and shipped? An important parameter of battery performance is the degree of stability. After the battery is stored for a certain period of time, the capacity and internal resistance of the battery will change. Time can stabilize the chemical properties of the electrolyte and reduce the occurrence of side reactions. At the same time, the self-discharge rate of the battery can be measured. After storage, it is filtered and separated.