Definition: The number of lithium battery cycles refers to the battery to complete a complete charge and discharge process, that is, the number of times that the battery is discharged from the full charge state to the battery is exhausted, and then charged to the full charge state. This process does not equate to a simple number of charges, but requires the battery to undergo a complete charge consumption and replenishment.
Calculation method: The number of cycles of lithium batteries is calculated by the cumulative complete charge and discharge cycle. For example, if a battery consumes 50% of the charge and is charged in use, then consumes the remaining 50% of the charge and is charged again, then the two processes add up to a complete number of cycles.
Influencing factor
Battery type: Different types of lithium batteries have different cycle times. For example, the cycle number of ternary lithium batteries is about 1500-2000 times, and the cycle number of lithium iron phosphate batteries is more than 2000 times. This mainly depends on the chemical composition and structural design inside the battery.
Charge and discharge rate: Charge and discharge rate has a significant impact on the number of cycles of lithium batteries. The high rate of charge and discharge will accelerate the chemical reaction inside the battery, thus shortening the cycle life of the battery. On the contrary, the slower charge and discharge rate helps to extend the number of cycles of the battery.
Deep charge and discharge: Frequent deep charge and discharge (that is, the battery is completely exhausted or full) will also shorten the cycle life of lithium batteries. This is because the deep charge and discharge process will produce more chemical reaction byproducts, which will occupy the space inside the battery and affect the performance of the battery.
Environmental conditions: Temperature is one of the key factors affecting the number of lithium battery cycles. At high temperatures, the chemical reaction inside the battery will accelerate, resulting in a reduction in battery capacity and cycle times; At low temperatures, the discharge rate of the battery will be slower, but long-term low temperature will also affect the life of the battery. In addition, environmental factors such as humidity and air pressure may also have an impact on the number of cycles of lithium batteries.
Usage habits: The user's usage habits will also have an impact on the number of cycles of lithium batteries. For example, overcharging and overdischarging, frequent charging to full charge, or long-term non-use of the battery can accelerate the aging and capacity decline of the battery.