Does fast charging affect lithium batteries?

To explore safety, we still have to start with the theory, at least, we also need to know the principle of fast charging. So why can fast charging shorten the time? Return to the physics formula taught by a physical education teacher: P 'electric power' u003d U 'voltage' x I 'current'. At present, the two methods to increase the charging power are either to increase the voltage, or to increase the current, or to increase both the voltage and the current. First, the charger steps down the 220V of the household electricity to 5V and outputs it to the MicroUSB interface, and then the internal circuit of the e-cigarette battery steps down to about 4.3V to charge the battery. There are two depressurization processes. Applying the following formula, we will understand better. ◆Question 2: Will fast charging affect battery life? In fact, the argument about the impact of battery fast charging technology on battery life has existed since the time of consumer electronics, but this argument is really worried by the outside world after the current rise of electric vehicles. At that time, charging piles and charging stations were still very scarce. Therefore, in order to ensure the charging speed, some charging stations use direct current, which can allow electric vehicles to flood as much electricity as possible in a short period of time. Therefore, the problem naturally arises, because in the case of immature technology, frequent fast charging with direct current will inevitably shorten the battery life. Therefore, in a survey, the respondents who think that fast charging will shorten the battery life are the most, accounting for as high as 70.5%. From the principle point of view, the damage of the battery basically comes from two aspects: on the one hand, when the battery is charged and discharged, the cathode and anode of the battery will shrink and expand with the release and absorption of ions, and long-term fast charging will damage the battery. On the chemical substances, the battery life is shortened. On the other hand, during fast charging, due to the relatively high current, the thermal effect of the current will be aggravated, resulting in high temperature in the battery, which will also cause the capacity to drop suddenly and the battery cell to be permanently damaged. From a personal perspective, once the set current value is exceeded, the battery life will be reduced. Both normal charging and fast charging will have an impact. After all, the heat generated during fast charging is relatively clear, and fast charging will be slightly stronger than the normal charging state, but such battery impacts are within a safe and reasonable range. ◆Question 3: Are there any safety hazards? So is the safety of fast charging guaranteed? This can be a simple example, which is more conducive to understanding. It can be imagined that the battery is a water polo. Then when the water polo is small, we can quickly add water at will, but when the water volume reaches a certain level, the water polo capacity will soon reach a critical value. If you continue to add water quickly, it is likely to explode the water polo. Therefore, in order to ensure that the water polo does not explode, the water volume must be reduced in the final stage and properly controlled so that the water polo can be filled without the water polo exploding. In combination with fast charging, there are currently several fast charging protocols, but no matter which fast charging protocol it is, it is the explosive charging in the early stage to maximize the efficiency, and after 90% of the power, it enters the trickle charging, the charger Work with the chip in the device to control the current into the battery to achieve a fast charging effect of X minutes of charging and several hours of use. It is precisely because of this kind of collaborative work that, according to the situation of the electronic cigarette battery, if the current is controlled, there will be no major problems in safety. Of course, all this requires the electronic cigarette battery to match the charger. ◆Question 3: Can the fast charging cable be used casually? In order to achieve fast charging, in addition to the specifications of the charging transformer that can support larger current and voltage output, the wires used are not generally cheap wires that can be sufficient for large current and large voltage output. Goole engineers previously issued a warning that many USB-TypeC cables are not of sufficient quality, which can easily cause equipment damage. Although it is for mobile phones, the charging of e-cigarette batteries is the same as that of mobile phone batteries. It can be seen that the equipment must support fast charging and the charging cable must pass. It is not only the solution that supports this technology, but also has to be equipped with many protective measures and peripheral device upgrades, which will increase a lot of cost and safety risks. It is suggested that matching the original adapter and power cord is the best choice. 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: Will the cost of lithium battery packs for electric vehicles decrease in 2020