The cycle life of lithium iron phosphate battery is a complex indicator affected by many factors, but a rough range can be given based on different research and actual application situations. The following is a detailed answer about the cycle life of lithium iron phosphate battery:
1. Definition of cycle life
The cycle life of lithium iron phosphate battery usually refers to the number of charge and discharge cycles of the battery under specific conditions until the battery performance (such as capacity, internal resistance, etc.) drops to a certain specified value. This specified value is usually 80% or other percentage of the initial capacity of the battery.
2. Specific range of cycle life
Cycle life in actual use:
In actual use, the cycle life of lithium iron phosphate battery is about 3000 charge and discharge cycles, and the battery attenuation will remain within 20%. This means that even if the battery goes through 3000 charge and discharge cycles, its remaining capacity can still maintain more than 80% of the initial capacity.
Taking 300 kilometers per charge as an example, 3000 charge and discharge means a total mileage of 900,000 kilometers. If you drive 60,000 kilometers per year, then theoretically it can be used for up to 15 years.
Cycle life under laboratory conditions:
Under laboratory conditions, the theoretical charge and discharge cycle number of lithium iron phosphate battery can reach 6,000 times or even higher. This is mainly due to the strict control of battery use in the laboratory environment, such as constant temperature, humidity and charging conditions.
Cycle life of different brands and models:
It should be noted that the cycle life of lithium iron phosphate batteries of different brands and models will also be different due to differences in their manufacturing process, material formulation and quality control. For example, BYD's blade battery is expected to have a service life of 8 years or 1.2 million kilometers under normal use, and the number of charge and discharge cycles can also exceed 3,000 times.
3. Factors affecting cycle life
The cycle life of lithium iron phosphate battery is affected by a variety of factors, including:
Manufacturing technology: The manufacturing process and quality control level of the battery directly affect its cycle life.
Battery management: A reasonable battery management system (BMS) can extend the cycle life of the battery.
External environmental conditions: Environmental factors such as temperature and humidity have a significant impact on the cycle life of the battery.
Drivers' usage habits: Charging methods, discharge depth, etc. also affect the cycle life of the battery.
In summary, the cycle life of lithium iron phosphate battery in actual use is about 3,000 charge and discharge cycles, and the attenuation degree remains within 20%; under laboratory conditions, its theoretical charge and discharge cycle number can reach 6,000 times or even higher. However, the specific cycle life needs to be comprehensively considered based on factors such as the brand, model and usage conditions of the battery.
