What are the effects of fast battery charging?

First of all, the question of whether the super fast charger is good or bad. There is no greater demand for super fast charging than electric vehicles. Charging an electric car in a few minutes can easily fill 50 liters of fuel into a 600-kilowatt-hour fuel tank. It is impractical to store such a large amount of energy in an electrochemical device, because a battery of this capacity weighs 6 tons. Most lithium batteries can only produce 150 watt-hours per kilogram; the energy from fossil fuels is about 100 times this number. The charging time of electric vehicles is always longer than the time of refueling, and the energy consumption per unit weight of batteries is always less than that of fossil fuels. Even if the battery is designed for this, violating the law and forcing ultra-high-speed charging will add pressure. We must remember that batteries are inherently slow. It is assumed that all charging energy enters the battery, whether it is slow charging, fast charging or ultra-fast charging. The battery is non-linear, and it is no problem to quickly charge an empty lithium battery to about 50% of the state of charge (SoC). When the acceptance of lithium ions at the anode becomes difficult, stress appears in the second half of the charge cycle, near the top of the charge. When the battery is dead, an ultra-fast charge is performed, and then the current is gradually reduced when the SoC is 50% or higher, which is called step charging. The notebook computer industry has been using step-by-step charging for many years. The charging current must be coordinated with the battery type, because different battery systems have different requirements for charging reception. Battery manufacturers do not announce the rates for SoC functions. Most of this is proprietary information. Charger 2. Electric vehicles, electric bicycles, flying objects, portable devices or amateur gadgets must meet the following conditions when charging at ultra-high speed: 1. The battery must be designed to accept ultra-high-speed charging and must be in good condition. Lithium batteries can be designed to charge quickly for about 10 minutes, but their specific energy is very low. 2. Ultra-high-speed charging is only applicable to the first charging stage. When the battery reaches 70% of the state of charge (SoC), the charging current should be reduced. 3. All batteries in the battery pack must be balanced and have ultra-low resistance. The capacity and resistance of aging batteries are often different, leading to mismatches and excessive stress on weaker batteries. 4. Ultra-high-speed charging can only be carried out at medium temperature, because low temperature will slow down the chemical reaction. Unused energy is compressed, gold-plated and heated. 5. The ultra-high-speed charger is comparable to a high-speed train with a speed of 300 kilometers (188 miles) per hour. Adding power is relatively simple. This track controls the allowable speed of the train, not the mechanics. Similarly, the state of the battery determines the speed of charging. 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: Notes on 18650 lithium battery winding process