3 Questions About the Battery of Electrical Vehicles
1. Does the power recovery increase the number of battery cycles?
The motor that powers new energy vehicles is almost exactly the same as a generator in terms of component structure and line connection. If you change the direction of rotation of the rotor, the motor can be transformed into a generator.
In order to reduce energy waste, engineers added a converter to the power system of the new energy vehicle. When the vehicle is coasting or braking, the converter will start on its own. The motor changes the direction of rotation and transforms it into a generator, which uses a part of the forward power to drive the generator to generate electricity, which is stored in the power battery. This is the braking energy recovery of new energy vehicles, also called kinetic energy recovery or power recovery.
The biggest advantage of kinetic energy recovery is that part of kinetic energy can be converted into electric energy, which can increase the power of the power battery, extend the driving range of electric vehicles and reduce the wear of the brake system.
It can be seen from the working principle of the kinetic energy recovery system that the kinetic energy recovery process is actually a process in which the motor temporarily charges the power battery. The more times the kinetic energy recovery is triggered, the longer the time is, and the more times the power battery is passively charged, and the longer the time is. Therefore, the kinetic energy recovery will actually increase the battery charging time and frequency. During the use of the power battery, the number of charging cycles is a very important parameter, which determines the service life of the battery.
The so-called charging cycle refers to the process in which the battery is exhausted and fully charged when the battery is fully charged, the number of charging cycles is the number of times the battery goes through such a complete charging cycle.
The number of charging cycles is not necessarily related to the number of battery charges, but has a certain relationship with the cumulative battery charge. If the single charge is 50% of the battery capacity, one charge cycle is completed after 2 charges. If the single charge is 20% of the battery capacity, one charge cycle is completed after 5 charges.
The trigger scenario for kinetic energy recovery is vehicle braking and coasting. In daily use of a car, the time that the vehicle is under braking and coasting is very short, and the number of times is not very much. For example, when a vehicle goes from a speed of 100 kilometers per hour to a stop, the braking distance is generally only more than 40 meters, which is nothing more than a few seconds. What’s more, the kinetic energy recovery will only be triggered when the brake pedal is half-depressed or the accelerator pedal is released to coast. Moreover, when the kinetic energy recovery system is working, the efficiency is not very high, and the recovered power generally does not exceed 20kWh, which is the lowest level of fast charging.
The kinetic energy recovery time is short and the power is low. Therefore, although the kinetic energy recovery can increase the power by charging the power battery, it is very difficult to complete a charging cycle. After all, when an electric vehicle travels five to six hundred kilometers on a flat road, the kinetic energy recovery time is usually only a few minutes, and it takes more than one hour for the battery to complete a charging cycle.
Therefore, although the kinetic energy recovery can increase the battery power, it will not significantly increase the number of battery charging cycles, and will not end the battery life prematurely. It should be known that under specific conditions in the laboratory, continuous charging and discharging at a charging rate of 1C, ternary lithium batteries after about 1000 charging cycles, lithium iron phosphate batteries after 2000 charging cycles, the battery capacity will decline to 80% of the initial capacity.
2. Is the number of cycles of a battery related to electricity itself?
3. Can the battery be used if it is swollen? Will it explode?
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