702535 battery.What is fast charging and slow charging? Is fast battery charging really good?

　　What is fast charging and slow charging?

　　1. There are two charging methods for electric vehicles, DC charging mode and AC charging mode. Due to different charging times, we usually use DC charging and AC charging for fast charging and slow charging.

　　Speaking of fast charging, there is no "fast charging" theme, this is a wrong theory. Dianjun popularizes it to everyone!

　　Fast charging and slow charging each have advantages and disadvantages. Fast charging takes less time and can greatly save time and cost, but the price is slightly higher than slower charging. Slow charging takes a long time, but is very cheap. If you charge it at night, you won't delay the next day's use.

　　Low temperature lithium iron phosphate battery 3.2V 20A -20℃ charging, -40℃ 3C discharge capacity ≥70%

　　2. The power we are talking about is essentially the electrons inside the battery. When you use it quickly, because the current and power are large, many electrons move from the positive electrode to the negative electrode at a very high speed. So it's like the peak period of the Spring Festival, if you don't have the ability to check the capacity, the battery is the same. Fast charging has very high requirements on the battery. During the process of temperature rise, during this period of time, electrons are like subway traffic during peak hours, quickly charging the internal balance of the battery, and its long-term battery will decay, affecting life. Slow charging does not have such high requirements on the battery, because its charging current and power are small, so it will not cause too much damage to the battery.

　　Isn't this a quick charge of the battery?

　　3. It depends on the density of the battery, battery material, battery temperature, and BMS (battery management system). It depends on the density of the battery, battery material, battery temperature, and BMS. Cell density, material, and temperature determine the speed, and Bristol-Myers Squibb's core components control fast charging. Its main function is to intelligently manage and maintain all cells, prevent batteries from charging and discharging, extend battery life, and monitor Battery status. Therefore, for fast charging of electric vehicles, the BMS controls the input current and voltage to minimize battery damage during fast charging. Within a limited time (different car battery warranty times), the loss is negligible. This is why when an electric vehicle goes to a 4S store for repair, the maintenance personnel should check the battery pack fault code.

　　Now the field of new energy is somewhat mature, especially the application of new energy to automobiles is more popular. Since it is a new energy vehicle, there must be something very different from a fuel vehicle. Take energy supply as an example. New energy vehicles do not need to go to a gas station to refuel. They only need to be charged. There are two ways to charge. Choice: Fast Charge and Slow Charge. We all know that if the battery brands are different, the charging time will definitely not be too different, so there are fast charging and slow charging that we just mentioned. Let’s talk about what fast charging and slow charging mean in detail, shall we? High-power DC charging is what we call fast charging. The battery is fully charged in half an hour. Slow charging is AC charging, which takes much longer, almost more than 6 hours!

　　In fact, when we usually drive new energy vehicles, if the remaining power is not enough for us to drive to where we want to go, then we should quickly find a charging pile near the destination to charge. If we have enough time, can we choose slow charging mode or slow charging mode? If you really don’t have time to use the car in a hurry, then use the fast charging mode! In fact, those who are interested can see that the editor actually recommends slow charging, because there is a difference between fast charging and slow charging. At this time, more curious car owners will have such a question, is it better to choose fast charging? Wouldn't it damage the car's battery?

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　　Something that must be popularized is that most of the power batteries used in our new energy vehicles should be lithium batteries. Therefore, according to the structure of lithium batteries, the most important part is the battery core. It is precisely because of this that we should be slower. A little charging will help extend the life of the battery. But if we really charge it very fast every time, there will definitely be some small damage inside the battery. In fact, when a lithium battery is manufactured, the indicators of each battery are definitely different. At this time, high-current charging will cause the battery plates to expand or become relatively loose. It's definitely not a big deal if we do it once or twice, but if we do this for a long time, the battery will definitely deviate seriously from our previous working state. Sometimes the battery capacity will become less. We are sure that the consequences of a sharp reduction in battery capacity will be You all know, it must be scrapped!

　　Usually, our companies will conduct some experiments when conducting research and development of new energy vehicle batteries. These experiments will also consider charging time and battery damage, so as to select a more moderate point. We all know that the battery is actually a consumable. If we calculate it based on charging it only once a day, then we will basically reach the end of its service life after using it for three or four years.

　　It is not impossible to use a quick charge when you are really in a hurry, and it will not cause too serious damage to the battery. This is actually similar to how we humans smoke. An occasional cigarette is actually not What bad effects will it have on the body? But if you smoke a pack of cigarettes every day for several years, it will definitely be bad for your lungs. Compared with cars, the battery of a small new energy vehicle costs us tens of thousands of yuan. Including the original maintenance costs, it is extremely high, so we are the owners of new energy vehicles who are planning to buy now or have bought them for a long time. We, when choosing the charging mode, we should choose slow charging first. This can also extend our service life, right?

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