Know the concept of lithium battery capacity in one article

Knowing the concept of lithium battery capacity, we now plan for electronic products. Many times, we also use lithium batteries for power supply, just like mobile phones or tablets use lithium batteries for power supply. We are familiar with the knowledge of lithium battery capacity. Perhaps the use and planning of lithium battery power supply includes the right The planning of the battery charger is necessary. Many people who are concerned about the discharge of lithium batteries have the experience that when the lithium battery is discharged from 4.2v to 3.7v, the moment is very long, but once it is discharged to 3.7v, it is very fast. Yes, this it is true. Let's take a look at some data about lithium batteries and give us a summary. Let us first talk about the discharge channel of the battery, which means that the lithium battery overflows during discharge and the battery voltage changes. The battery continues to discharge, and the battery voltage goes through three processes, that is, falling, stabilizing, and then falling. Among these three processes, the stable period is the longest. The longer the hold time, the higher the discharge channel of the clarified battery. The concavity of the discharge channel is closely related to the manufacturing process of the battery. This is because the market positioning of each lithium battery manufacturer is different, the technical process is different, the discharge channel controlled by it is also different, and the quality is also very different. Generally speaking, the full voltage of a 18650 lithium battery is 4.2v. When a 1C current discharge is 3.7v for 60 minutes, the capacity of the battery is assumed to be 2200mAh. During this period, according to the characteristics of rechargeable batteries, in order to better know the battery capacity, voltage, current and torque, and the connection of the discharge channel, the capacity of the lithium battery and the indicated capacity of the discharge channel (C) u003d discharge current × battery discharge channel time. The capacity is 2200mAh For the 18650 lithium battery, it takes 1 hour to discharge to 3.7v at 1C, and the capacity (C)u003d2200mA×1hu003d2200mAh. The problem is that for a better lithium battery, when we do a product test, the voltage drops rapidly after 3.7v, so The amount of electricity released in a short period of time is very small. On the contrary, when a bad battery is discharged from 4.2v to 3.7v, the voltage drops rapidly, and the voltage drops slowly after 3.7v. This battery has poor performance and small capacity. So the discharge channel of a good lithium battery is 3.7v. In general, under constant voltage conditions, the charging voltage is 4.2v, and the current is less than 0.01c when the charging stops, and then the battery is left for 10 minutes. At any discharge current rate, when the battery is discharged to 3.7v, the discharge of the battery has experienced a long moment, which is an important indicator to measure the quality of the battery. However, do not blindly seek a high channel. Sometimes the channel voltage is high and the capacity will be reduced, because the channel voltage is different under different multiplier conditions. Therefore, the channel problem should be considered from many aspects. A good battery is a specified voltage with high capacity and long duration. What is the flow rate? Discharge rate F: [1/h], which means the charge (discharge) rate for N hours, often just say the number, not the unit; F is also called the charge (discharge) rate for N hours, Fu003d1/(N hours ), generally can be calculated as: Iu003d0.1X[1/(Nhr)]XC For example, when the battery capacity is 2200mAh, the charging current is 0.1℃, which is equivalent to: the battery charging current Iu003d0.1[1/h ]X2200[ma]u003d220[ma] Through the above schematic diagram of lithium battery capacity and discharge channel, we can better know the truth of battery charge capacity and battery discharge channel. It is also possible to measure the working time of a high-power battery. The capacity of the two batteries is the same. After fully charged, the same assumption is from 4.2V to 3.7V at the same time, but for a long time, the time is short, and the battery channel is high for a long time. It is a high-voltage working time that is very long. For example, the standby time of these two battery phones is the same, but for two phones, the channel battery notification is long and the channel time is short, and the battery moment will be twice as short. In terms of the picture, another significance is that it is also meaningful to know the power management and monitoring of lithium batteries. For example, there are generally two methods to monitor the power of a rechargeable battery. Battery voltage measurement. When the charger is charging, it will detect the battery voltage. When the voltage reaches the specified voltage value, it is regarded as full voltage. 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.