Understanding the li ion battery recharge cycles is crucial for effective management and improving their performance.
This article will explore the key role of lithium ion charge cycles, the difference between deep charging and shallow charging, the feasibility of lithium battery recycling, and how to effectively extend battery life.
Think that will be helpful to you.
目录
What is battery cycle counting?
The number of cycles of a battery, also known as the charging cycle or discharging cycle, refers to a complete cycle of charging the battery from a fully discharged state to a fully charged state, and then discharging it to an empty state.
This process represents a complete charge and discharge cycle experienced by the battery, and is an important parameter for measuring the health status and service life of the battery.
The tracking of battery cycle times is important because they are closely related to the lifespan of the battery. Each charging cycle may result in a slight decrease in battery capacity.
Taking lithium-ion batteries as an example, after each cycle, the capacity of the battery will slightly decrease, which will gradually affect the device’s usage time and battery performance.
Battery cycle counting is crucial for predicting the expected lifespan of batteries and evaluating their current health status.
Manufacturers and users need to estimate how long the battery can last before it needs to be replaced or experiences significant performance degradation based on cycle counting.
What is a charging cycle?
The charging cycle refers to the complete charging and discharging process that a rechargeable battery undergoes.
When you use a small device until the battery runs out, you are discharging.
Batteries are usually pre charged during the production process before being used or purchased.
The standard method for evaluating the charging cycle of rechargeable batteries is to calculate the total number of charging and discharging cycles that the battery can withstand before significant performance degradation.
The frequency, 电压, and battery life (measured in milliampere hours/mAh) of the charging cycle are key indicators for measuring the performance of rechargeable batteries.
A charging cycle can be the complete process of a battery from a fully charged state to a fully discharged state, or a series of discontinuous partial discharges that accumulate to equal the total capacity of battery.
What is lithium battery deep and shallow charging?
The charging strategy of lithium batteries can be divided into two methods: deep charging and shallow charging, each of which has different effects on battery life and performance.
Deep charging refers to charging a lithium battery to its maximum capacity, 这是 100% 收费.
This charging method allows the battery electrodes to absorb as much energy as possible, but at the same time, it also puts significant pressure on the battery.
Especially when approaching the charging limit, it may accelerate the aging of the internal chemical reactions of battery, thereby shortening its service life.
Relatively speaking, shallow charging refers to charging a lithium battery to a level below its maximum capacity, 例如 20% 或者 50%.
This method reduces the pressure on the battery and avoids reaching the charging limit.
But if not fully charged for a long time, it may cause the battery calibration to fail, affecting the accuracy of the battery level indication.
Lithium batteries are more suitable for shallow discharge and shallow charging, unless the power module of the device requires deep charging calibration of the battery.
Lithium ion powered devices can be charged at any time without affecting battery life.
Shallow cycle charging is suitable for scenarios that require a short burst of energy, while deep cycle charging is suitable for situations that require long-term use until the battery level is far below 50%.
The lifespan of lithium batteries typically ranges from 300 到 500 charging cycles, depending on the total capacity Q of the battery and the amount of electricity used each time.
If half the capacity is used each time, the charging times can reach 600-1000 次; If 1/8 capacity is used each time, the charging times can reach 2400-4000 次.
所以, the lifespan of lithium batteries is directly proportional to their total charge, not just the number of times they are charged. If you charge randomly, the number of charges is unpredictable.
To extend the service life of shallow cycle batteries, it is recommended to install a discharge control circuit that automatically shuts down the battery and charges it when the battery level drops to around 50%.
And for the health maintenance of deep or shallow cycle batteries, intelligent charging/discharging monitors are essential tools.
What is a cycle on a battery ?
Battery cycling refers to the complete process of charging a battery from a fully discharged state to a fully charged state. Even if it is not a single charge, as long as the battery is fully charged, it is considered to have completed a cycle.
例如, if you use only half of the battery’s capacity in a day and then fully charge it, this process is also considered a complete charging cycle.
How many times can lithium battery cycle?
The expected lifespan of lithium-ion batteries is usually 2 到 3 years or 300 到 500 complete charge and discharge cycles, whichever comes first.
For battery packs that have not completed the entire charge and discharge cycle, we generally consider their average lifespan to be around 2 到 3 年.
然而, in reality, the lifespan of most lithium batteries far exceeds the minimum standard, reaching 10 到 15 年.
The lifespan of low-cost lead-acid batteries is usually only 5 到 7 年, while the lifespan of lithium-ion batteries is about three times longer.
The charging life of lithium batteries is limited and will gradually lose the ability to maintain power over time, and this capacity decay is irreversible.
Over time, the capacity of the battery will gradually decrease, resulting in a shortened power supply time (running time).
Even when not in use or stored, 锂离子电池 will experience natural discharge. 所以, it is very important to regularly check the charging status of the battery.
通常, the user manual of the device provides guidance on how to check the battery status and charge it.
Do lithium batteries need to be cycled?
Need. Moderate use of battery cycling can help extend its lifespan.
When a lithium battery is discharged from a fully charged state to a 25% state of charge (片上系统), its capacity loss is most severe; If discharged until completely depleted, the capacity loss will further increase.
Charging battery to 100% and then discharging it to 50% will result in a shorter battery life compared to cycling within the range of 85% 到 25%.
Research has shown that charging lithium batteries to 75% and discharging them to 65% can minimize capacity loss.
How to improve the cycle life of lithium batteries?
The duration of use of a device before it needs to be charged is called “battery life”, and the duration of use of a battery before replacement is called “battery life”.
Your usage habits of the device can affect the battery life and endurance, which is directly related to the battery recharge cycle.
Charging to the appropriate level: Charging the battery to approximately 80% of its capacity can help reduce the burden on the battery and improve its durability.
Maintain moderate battery storage: When storing lithium batteries for a long time, it is recommended to keep the battery level at around 50% to reduce battery pressure.
Choose official charger: Use a charger specifically designed for lithium battery models to ensure a safe and efficient charging process.
Reduce the use of fast charging: Try to avoid frequent use of the fast charging function as it may accelerate battery aging and shorten battery life.
Firmware update: Regularly update device firmware to optimize battery management and improve charging efficiency.
Manage battery load: Reduce high power consumption activities such as running multiple resource intensive applications simultaneously.
经常问的问题
What is the lithium ion charge cycles?
The standard charging and discharging cycle of lithium batteries refers to charging from a low battery state until it is fully charged to its full capacity.
After a complete discharge and subsequent charging process, completes a li ion battery charge cycles.
Can lithium-ion batteries be placed on a charger for a long time?
To ensure the safety and proper charging of lithium-ion batteries, constant current/constant voltage (CC/CV) charging is commonly used.
This means that during the charging process, the battery is first charged with a constant current until the voltage reaches the preset value, and then the current automatically decreases until it stops.
Based on this charging mechanism, as long as appropriate voltage limits are set for lithium-ion batteries, there will be no problem even if the battery is left on the charger for a long time.
As long as the charger follows the CC/CV charging curve and the maximum voltage and current remain within a safe range, the battery can be safely charged.
然而, maintaining a fully charged state for a long time may have a slight negative impact on battery performance.
How many times can lithium ion battery charge cycles?
The number of charging cycles for lithium batteries is influenced by usage frequency, charging method, and environmental factors.
The number of charging cycles for lithium batteries is influenced by usage frequency, charging method, and environmental factors.
结论
Lithium ion batteries can withstand up to 500 lithium ion battery life cycles, which is common in the industry.
Having a deep understanding of their working principles, mastering the li ion charge cycle rules, and cultivating lithium batteries with a charge memory can help you use these batteries more efficiently.
Full charge cycle, full battery lifespan.
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