The current new energy vehicle batteries are basically ternary lithium batteries or lithium iron phosphate batteries. The latter has a longer lifespan. Both of them can be called “lithium batteries”.
There are two main factors for measuring the battery life of new energy vehicles: the number of charging cycles, and the time. In addition, there are several secondary factors: the average power of charge and discharge, battery storage and working environment temperature, and depth of charge and discharge.
1. The number of charging cycles.
Usually under ideal conditions, the number of charging cycles can reach 1000-2000 times, and more than 70% of the usable capacity can be guaranteed. If it is a PHEV, the mileage of a single cycle is about 50-80 kilometers, so before the battery is scrapped, it can be used for about 100,000 kilometers on pure electricity. But because PHEVs often have a lot of mileage on hybrid power, it can probably be done according to the number of charges. In any case, PHEVs have a small battery capacity, so their lifespan is also shorter. Theoretically, the useful life of a PHEV private car is about 5-10 years.
However, the BEV of pure electric vehicles is easier to calculate. Taking a mainstream model with a range of 400 kilometers as an example, it can travel 400 kilometers on a single charge. According to at least 1,000 cycles, the theoretical usable life is 400,000 kilometers. If 100,000 kilometers per year (operating vehicles), the theoretical life is 4 years. If 20,000 kilometers per year (private car), the theoretical life is 20 years (really?), but doesn’t it mean that 50,000 kilometers per year can be used for 80 years? This involves the following factors:
2. Use time.
Usually lithium batteries can be used for 10 years without any problems as long as they are properly maintained. At least my Nokia 3120 phone battery is still alive. For a longer period of time, it is more difficult to say because of various maintenance problems and the decay of the active material of the battery itself. From the actual use experience, it is no problem for lithium batteries to have a calendar life of more than 10 years under proper storage conditions. of
4. Battery storage and working temperature.
Temperature also has a great impact on battery life. If the battery works below 0 degrees Celsius for a long time, or above 40 degrees Celsius, it will accelerate the aging and capacity decay of the battery, and this decay is irreversible . Fortunately, today’s new energy vehicles are basically equipped with a battery temperature control system, which enables the battery pack to work at a more suitable temperature.
Therefore, under normal use, the battery life of PHEV is 5-10 years, and the battery life of BEV is 10-20 years.
Post time: May-26-2022