What are the requirements for charging lithium-ion batteries

1. The charging and discharging rate of lithium-ion battery is as high as possible. C is a special symbol to describe the size of battery charge and discharge current. 1C discharge means the amount of current required to discharge the battery from full to empty within 1 hour. 2. Rate example: iPhone6s battery capacity is 1810mAH, then the 1C discharge current of this battery is 1.81 amperes. 3. Example of discharge rate: Each battery used in BYD e6 electric car has a capacity of 200 AH, and the 1C discharge current of this battery is 200 amperes. If a battery is discharged at a high rate, it usually emits less energy than a low rate. 4. Lithium-ion batteries are widely used. There are many types of lithium-ion batteries in mobile phones and digital products, tablet computers and notebooks, power tools, electric bicycles, electric vehicles, power supplies and energy storage. 2. Description of the number of charging and discharging cycles of lithium-ion batteries 1. The more cycles of lithium-ion batteries, the better. 500 times is a common value for lithium-ion batteries, and the number of charging and discharging times for lithium-ion batteries made of different materials ranges from 300-3000 times. The specific meaning of this value may be slightly different for each factory. It can be roughly understood as: According to the charge and discharge rate specified by the manufacturer (such as 1C discharge, 0.3C charge; each time from 0% to 100%, the cycle is repeated) , After 500 cycles, the battery capacity is still 80% of the original. If the positive pole piece of the battery and the negative pole piece of the lithium ion battery are well matched, the temperature control of the battery injection volume and all the steps are above the technical standard, then the defective rate of the battery will be very low, and it is related to In terms of the quality of the same batch of batteries, there is definitely no major problem. The number of times of charge and discharge of the battery quality is too much related to the usage habits. Examples are as follows: 2. The impact of the intensity of charge and discharge of lithium-ion batteries on the number of cycles. : Charge and discharge from 0% to 100% each time, 1C discharge, 0.3C charge, and the capacity decays to 80% after 500 times. This is the most stringent test cycle, and it can be less stringent. See below. If the power cycle is 25%-75% each time, 1C discharge, 0.3C charge, the capacity decays to 80% after 2000 times. If the power cycle is 25%-75% each time, 3C discharge, 0.3C charge, the capacity decays to 80% after 1600 times. 3. The impact of shallow charging and shallow discharging of lithium-ion batteries on life: the lithium-ion battery factory marked: each time from 0% to 100%, 1C discharge, 0.3C charge, the capacity decays to 80% after 500 times, which is the most The rigorous test cycle can also be less rigorous, see below. Each cycle of power is 25%-75%, 1C discharge, 0.3C charge, after 2000 times, the capacity decays to 80%. Each cycle of power is between 50%-100%, 1C discharge, 0.3C charge, the capacity decays to 80% after 1800 times. 3. What is the consistency of the internal resistance of lithium-ion battery charging and discharging? 1. The smaller the internal resistance of the lithium-ion battery, the better. This parameter changes with the load, temperature and other factors. As the battery life decreases, the internal resistance gradually increases. The lower the internal resistance, the more high-rate the battery can be charged and discharged. The internal resistance of the ordinary 18650 battery is about 50m, and the power type 18650 battery is about 15m. If you want to know how big the internal resistance is, you need to use a special device to measure it, not an ordinary multimeter. 2. The higher the consistency of the capacity, the internal resistance, and the charge-discharge curve of the battery produced with the same material and the same process, the better the internal resistance of the lithium-ion battery. Whether batteries can be assembled into battery packs on a large scale is very important. The larger the battery pack size, the higher the requirements for consistency. 3. According to different application fields, make detailed analysis of various parameters: lithium-ion batteries for electronics such as mobile phones and tablets, lithium-ion batteries for notebooks and mobile power supplies, lithium-ion batteries for electric bicycles, and lithium-ion batteries for electric vehicles. Lithium-ion battery charging and lithium-ion battery discharge are a problem that must be faced in all electrical performance tests. Only when the battery is safe can the quality of lithium-ion batteries be guaranteed. 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