Is frequent use of fast charging harmful to car batteries?

Under normal circumstances, the car will mark the slow charging time and the fast charging time. Among them, the fast charging time is the most competitive point of the major car companies. The shorter the fast charging time, the sales will be better and the attention will be higher. We can often see a few words in press releases: XX electric car is known as the VIVO of the automotive industry, charging for five minutes and two hours of battery life, from now on bid farewell to the long trouble of charging, charging to 80% in a cup of coffee, who pays Said electric cars are not reliable. It can be seen that whose fast charging time is shorter, and it is even more gimmicky in front of consumers. Since fast charging is so powerful, why is there a slow charging? As the saying goes: haste is not fast. In fact, the same is true in the field of pure electric vehicles (at this stage). Although fast charging can shorten the charging time, it is also more harmful to the battery. Are you surprised that fast charging is actually harmful to the battery? Today, we will talk about this topic. First of all, before dealing with this problem, let's first understand the difference between slow charging and fast charging. We all know that slow charging uses alternating current, and the time for overflow is generally 6-8 hours. In this charging mode, the battery suffers the least damage. Relative to slow charging, fast charging is an emergency charging method, using high-power DC charging (also AC fast charging), the voltage of this DC charging is generally greater than the battery voltage, a large amount of current ions will also be Very fast and very efficient speed flows from the positive electrode to the negative electrode of the battery, thus completing this process of fast charging. To put it simply, the principle of fast charging is like a small bottle should be opened with the smallest water flow to fill water. In order to reduce time, you can open the largest one. Of course, you can fill a lot at once, but such a large water flow also has a problem for the water bottle. It's a big shock. In other words, in the case of long-term fast charging, the actual battery voltage is very high. Under such a high voltage state, the battery will definitely be affected. After talking about the difference between slow charge and fast charge, we have to know about the battery. At present, the batteries in electric vehicles are generally lithium batteries and lead-acid batteries. Different batteries have different power generation mechanisms, and there are also great differences in the sensitivity of fast charging. For example, when a lead-acid battery is charged, the internal electrolyte will gradually react and decrease, eventually causing the battery capacity to gradually decrease and the cruising range to decrease. Although slow charging will also cause the battery capacity to decrease, but the speed is relatively slow, and the damage caused is also very small. After talking about lead-acid batteries, let's take a look at the ternary lithium batteries that are mostly used in new energy vehicles on the market today. The characteristics of this battery are light weight and large power. But it also has certain disadvantages, that is, if thermal runaway occurs during use, it is easy to cause fire and explosion. Closer to home, when the vehicle is fast-charging, a relatively large current will be input into the battery instantaneously, which will affect the battery's ability to restore. The reduction ability of the battery decreases, so the decay speed of the car battery will increase, which in turn affects the battery's endurance and overall performance. At the same time, the charge-discharge rate of lithium batteries is also worthy of attention. Among them, refers to the charge and discharge current within the unit rated capacity. When a battery with a rated capacity of 100Ah is charged and discharged at 20A, its charge-discharge rate is 0.2C. Generally, the charging current of lithium batteries is set between 0.2C and 1C. The larger the current, the faster the charging, but at the same time, the more serious the battery heating phenomenon, and even the occurrence of spontaneous combustion. Although fast charging has certain hazards about batteries, you don't need to worry too much. Because, in order to reduce the damage of fast charging to the battery, engineers invented a very important component BMS power management system. Regarding electric vehicles, BMS is the core component of fast charging. The important purpose of BMS is to intelligently manage and maintain each battery unit, guard against overcharge and overdischarge of the battery, extend the service life of the battery, and monitor the status of the battery. To put it simply, the BMS uses an intelligent control algorithm to perform segmental adjustments to the charge current pulse width, intermittent time, and discharge current pulse according to the current battery state, and modulates the appropriate current and voltage to complete the charge, reducing the speed as low as possible. Charging damages the battery, so these damages can be ignored in a limited time. 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. Previous: Comparison of Lithium-ion Battery Fuel Power Battery and Lithium Battery Powered by Electric Vehicles