In commercial batches, lithium ternary and lithium iron phosphate batteries are more common. The cycle life of Li-ion ternary batteries is about 500 cycles, while that of Li-FePO4 batteries is about 2,000 cycles.
The cycle life of a Li-ion battery pack is related to the life of individual cells, the consistency between cells, the amount of charging and discharging current, and the small details in use.Battery recycling Some information about these small details will be shared below.
1. The size of charging and discharging current has an impact on the cycle life of lithium batteries.
The standard charging and discharging current of Li-ion battery is 0.2C, i.e. for a Li-ion battery with a capacity of 10Ah, the standard charging and discharging current is 2A.cylindrical cell assembly machine such a current is the best for the life of Li-ion battery pack.
This is also the reason why the cycle life of high-magnification lithium batteries is shorter than that of small-magnification lithium batteries. The cycle life of small rate type (below 3C) Li-ion ternary batteries is usually labeled as 500 cycles,battery making machine while the cycle life of high rate type (above 5C/10C) Li-ion ternary batteries is usually labeled as about 300 cycles.
2. Depth of discharge (DOD) has an impact on the cycle life of Li-ion battery.
Shallow charging and discharging is more favorable to the life of lithium battery. Li-ion batteries will always be in a charged state, which is more favorable to the activity of the material.
3. Li-ion batteries are often overcharged or over-discharged which will affect their cycle life.
Even though the BMS protection board of Li-ion battery has the protection function of overcharging and overdischarging, after overcharging or overdischarging, it will lead to some damage to the material of Li-ion battery, which will affect its cycle life.
So how to avoid overcharging or overdischarging of Li-ion battery?
The overcharge protection value of the BMS protection board can be appropriately lowered, and the overdischarge protection value can be appropriately raised. This can make the lithium battery neither charge too full, nor discharge too exhaustive.
4. Too high or too low temperature will affect the cycle life of lithium battery.
Charging and discharging at an ambient temperature of 25℃ is optimal, high or low temperatures will accelerate the decay rate of lithium batteries, resulting in shorter cycle life.
When the temperature of Li-ion battery is too high or too low, it is necessary to use BMS to control and manage the temperature of Li-ion battery pack.
5. The storage method will affect the cycle life of lithium battery.
In the case of long-term non-use, it is recommended to keep the storage capacity of the Li-ion battery pack above 50% and not to store it empty. At the same time, it is recommended to carry out a charge/discharge cycle every 3 months, otherwise the lithium battery material will be damaged to some extent, and the cycle life will be shortened accordingly.
6. The environment of use will affect the cycle life of lithium battery.
For example, in areas with high humidity and high salt spray concentration, it will accelerate the corrosion of lithium battery and reduce its cycle life. In addition, excessive vibration, collision and high magnetic field and other external destructive interference will also have a certain impact on the cycle life of lithium batteries.
Related articles:
How often should I change the battery of my electric car?Who is more durable, 48V20AH or 60V20AH?
New electric car battery breaks through the highest energy density, cycle life up to 20,000 times
New energy vehicle battery recycling: survival of the fittest for a virtuous cycle