What are the importance of fast charging technology for lithium batteries?

What is the importance of lithium battery fast charging technology? Lithium batteries are divided into positive and negative data. We often say that lithium iron phosphate, the ternary data actually refers to the positive electrode of the lithium battery. Now, there are thousands of laboratories in the world trying to develop better performance lithium batteries. In fact, we just want to find some positive data with better functions, greater capacity, longer life, and better charge and discharge capabilities, or to do work on the negative electrode. We usually use more lithium battery negative electrode data is graphite, but in recent years, a new negative electrode data has also appeared, namely lithium titanate. This photo is only entry-level. So what is the core of fast charging? When a lithium battery is discharged, lithium ions run out of the negative data, and then run to the positive electrode. This process is actually a relatively short end, that is, the discharge power of the lithium battery It can be very big. But traditionally, the power is not so short. From your positive information, the charged lithium ion encounters the cathode material, and the process is relatively testing negative information. Due to the rapid access of lithium ion information, the structure of the cathode material is damaged in the formation, generally In terms of the fast charging function of lithium batteries, there are few benefits. But fast charging is a feature of many people's enthusiasm. In the past, only supercapacitor talent show fast charging, so to overcome the feature that lithium batteries cannot be quickly filled, from the perspective of information, we should start to think of ways to improve information, especially the cathode material in charging Function, based on information or chemistry homework to do. First of all, why does the business dilemma of electric buses emphasize fast charging? I want to start with the application of electric vehicles. First of all, new energy vehicles are promoted in our country. The easiest way to promote government malls is electric buses. From the Olympic Games to the World Expo, pure buses have been used in many cities in about six or seven years. Please look at a short set of data. This PPT describes the dilemma encountered by electric buses in commercial applications. A 12-meter pure electric bus. The bus typically runs 250 kilometers a day. What is it? Of course, it runs back and forth between point A and point B. The typical power consumption is 0.8 kWh per kilometer. If the car runs for all days, it is about 200 kW. It seems that there is not much power at the time, but in the battery of the device, two factors should be considered. The first is the battery charging and discharging time interval, and the attenuation of the battery life. Therefore, the power equipment of 312 kWh, plus summer air conditioning For the energy consumption of 500 kWh, a 12-meter-long bus can run all day. In fact, the current energy density level of lithium batteries, if lithium iron phosphate is installed, the battery may be about 500 kWh, and the battery may be about 6 tons. The current capital is at least 1 million or more. Such batteries are not 12 meters in size and component mountains, so this plan None of us can use it. The common practice is almost half of the electricity or 300 kilowatt-hours of electricity, which makes the car unable to end the full-day operation. Generally in the afternoon, the coach will return to the charging station as a quick repair electric work. This period usually takes one hour to one and a half hours. Hours, replenish part of the strength, and then complete the second half of the operation. But this result is not so effective for the bus company, because the bus company does not work for two hours a day. So the next question is, can we use a battery with a higher energy density to complete this work? The highest energy density of commercially available batteries is the Tesla 18650 Panasonic battery, which has an energy density of up to 230 watts per kilogram. If you really want to use 5 Baidu power, weighing about 3.5 tons, it can meet the entire operation, and the bus can basically be saved, but the problem with the top use of the battery bus is that it becomes history, yes, the cycle life after reorganization may be It only takes five hundred times, so we hope it can be used on the bus, and it can only be used for about two to three years. Therefore, we have seen a lot of engineering and cost issues, using energy-based batteries on buses, trying to cope with the needs of all-weather operation, either because they are too heavy and expensive, or because they are not used for long enough. 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 post: What kind of materials are used for the 18650 lithium battery?