What are the factors that limit the charging speed of the battery?

What are the factors that limit the battery charging speed? The opening of the new energy automobile industry has also affected the market demand for power lithium-ion batteries. So what are the factors that restrict the charging speed of the battery? In addition to the bottleneck of the battery itself, what other factors are there? The following is the content of the power battery brought by the author, I hope we can gain something! In the current mainstream lithium battery, For example, although there are many varieties, they generally do not include data structure anodes, cathode materials, alienation, electrolytes, etc. During the charging process, it is important that lithium ions reach the positive and relaxed speed from the cathode through the gap and the electrolyte. The process becomes the key to charging speed. What limits the charging speed of the battery? When evaluating the charging speed, the battery's own endurance is definitely one of the most unpreventable factors. Regardless of the size of the peripheral charging equipment, the amount of power, and the strength of the charging talents, assuming that the battery itself has a short board that the charging person can withstand, the charging speed will not increase. In addition, the battery capacity is relatively large, and the natural charging time is long. If you have studied electrochemistry, you will know the charging and discharging process of the battery. Essentially, the battery will undergo a series of redox reactions to complete the directional transmission of electrons between the positive and negative electrodes. In the current mainstream lithium batteries, for example, although there are many varieties, they generally do not include the anode, cathode material, alienation, electrolyte, etc. of the data structure. During the charging process, it is important that lithium ions pass from the cathode through the gap and the electrolyte. Reaching the positive and loose speed, the natural loosening process becomes the key to the charging speed. In theory, the charging speed can be increased by adding current. However, if the current is too large, the loose speed of the lithium battery cannot keep up with the loose speed of the electrons, which will cause the separation and transmission of electron ions, which will affect the function of the battery. The charging capacity can be reached and reduced accordingly, and the life of the battery is even more unbearable. See, there is even a danger of fire and explosion. So generally speaking, if you are not in a hurry, we recommend charging as slowly as possible to help extend battery life. The loosening speed of lithium ions is closely related to temperature, positive electrode data and structure. The first is the temperature. Generally speaking, the higher the temperature, the faster the loosening speed. However, if the temperature is too high, it will cause problems such as a decrease in battery life and a decrease in charging safety. If the temperature is too low, the same is not good. If the temperature is too low, the metal lithium in the battery will be deposited, thus forming a short circuit in the battery, especially the lithium iron phosphate battery. Under normal circumstances, the capacity of a lithium iron phosphate battery is only 60~70% at 0°C, and only an unfortunate 20~40% at -20°C. Therefore, in the cold northern winter, it is necessary for electric vehicles to heat the battery modules to consume electricity more quickly. The second is data. There is a large gap in talents with different data loose, such as lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, unqualified products, NCA is a very good function of positive data, and then they are all the best current functions. Use a wide range of high two types of data. This is also an important reason why the current lithium battery is named after the positive data. In the battery industry, the relationship between charging speed and current is usually described by the charge-discharge ratio. For example, the rate at which the battery is fully charged for 1 hour is called 1C, the rate for only 30 minutes is called 2C, and so on. At present, the charging rate of lithium batteries can be widely realized between 1C~3C, and the maximum can reach about 5C, but there is still a big gap compared with the discharge rate of 10C. In addition to the bottleneck of the maximum charging rate, the charging rate that the battery can withstand under different states of charge is also different. Generally speaking, the characteristics of the battery during the charging process are similar to the above picture, and the charging speed will have a slow-fast-slow rhythm. Under normal circumstances, when the state of charge reaches more than 90%, the internal resistance of the battery increases significantly and the charging speed becomes slower. 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: Explanation of the repair method of 18650 lithium battery