Extend the lithium-ion battery life?

　　Author ：Iflowpower – Portable Power Station Supplier

People have always attached great importance to the capacity of the lithium-ion battery, in order to achieve the longest product working hours with the smallest physical dimensions. However, in some applications, longer battery life, less charging, or more secure batteries more important than battery capacity. This article describes several lithium-ion batteries that can greatly extend battery life.

Almost all high-performance portable products use a rechargeable lithium ion battery including a lithium ion polymer battery, which is due to other rechargeable batteries, a lithium ion battery has a high energy density, a higher battery. Voltage, self-discharge, very long cycle life, and simple charging and maintenance. In addition, due to its relatively high voltage (2.

9V to 4.2V), many portable products can be operated with a single battery, thereby simplifying product overall design. Deciding that the lithium-ion battery cycle life or service life does not exist any single factors that extend or shorten battery life, and often combine several factors to play a role.

In terms of prolonging cycle life, there is a way to extend battery life: 1. Partial discharge practice. Use only 20% or 30% battery capacity before charging, greatly prolong the cycle life.

As a general rule, 5 to 10 shallow discharge cycles are 1 full discharge cycle. Although some discharge cycles may reach thousands, keep the battery in full charge and shorten battery life. If possible, the full discharge cycle should be avoided (drop to 2.

5V or 3V, depending on the chemical material). 2. Avoid 100% of charging to capacity.

Choose a lower floating voltage to do this. Reducing the floating voltage will progressively life and service life, and the cost is to reduce battery capacity. The floating voltage is reduced by 100mV to 300mV to extend the period life of 2 to 5 times or longer.

Lithium-ion cobalt chemical materials more sensitive to higher floating voltages compared to other chemical materials. Lithium phosphate ion battery is generally lower than the floating voltage of the more common lithium-ion battery. 3.

Select a suitable charging termination method. Choose a charger using the minimum charging current to terminate (C / 10 or C / X), by 100% of the capacity, can also extend battery life. For example, the current falls to the C / 5 to end the charging cycle similar to the effect of falling the floating voltage to 4.

1V. In both cases, the battery is only charged to about 85% of the capacity, which is an important factor in determining the life of the battery. 4.

Limit the battery temperature. Limit the limit temperature of the battery to extend battery life, especially for charging at 0 ¡ã C or less. Charging the metal below 0 ¡ã C to promote the plating of the metal on the battery, which may cause internal short circuits, generating heat and make the battery unstable and unsafe.

Many battery chargers have a device with a measure of battery temperature to ensure that it does not charge at extreme temperatures. 5. Avoid large charging and discharging current, because this will shorten the period of cycle.

Some chemical materials are more suitable for large current, such as lithium ion manganese and lithium phosphate ion batteries. High current exerts excessive pressure to the battery. 6.

Avoid depth discharge below 2V or 2.5V, because this will quickly damage lithium-ion batteries. Internal metal plating may occur, which causes short circuit to make the battery are not available or unsafe.

Most lithium-ion batteries have an electronic circuit in the battery pack. If charging or discharge, the battery voltage is below 2.5V, more than 4.

3V or if the battery current exceeds a predetermined threshold, the electronic circuit will disconnect the battery connection. The recommended method of charging the lithium ion battery is to provide a constant current of ¡À 1% compression to the battery until the battery is covered with electricity, and then stop charging. Methods used to determine when the battery is covered with electricity includes: giving a total charging time, monitoring charging current or using these two methods.

The first method uses a constant pressure constant current, and the variation ranges from C / 2 to 1C for 2.5 to 3 hours to allow the battery to charge 100%. You can also use a lower charging current, but it will take longer.

The second method is similar to the first method, just requires monitoring charging current. As the battery is charged, the voltage rises, which is exactly the same as the first method. When the battery voltage reaches the program limit value (also known as a floating voltage), the charging current begins to decline.

When the current falls, the battery is charged to 50% to 60% of the capacity. The floating voltage continues until the charging current drops to a low level (C / 10 to C / 20), when the battery is charged to 92% to 99%, the charging cycle is terminated. At present, it is necessary to quickly charge (less than 1 hour) to 100% of the standard lithium-ion battery, no safety method.

It is not recommended to add a continuous voltage to the battery after the battery is full, since this will accelerate the loss of permanent capacity, and may cause internal lithium metal plating. This plating may develop into internal short circuit paths, causing overheating, so that the battery is unstable when the battery is hot. The time required for a few months.

Some lithium ion battery chargers promise to use thermal resistance to monitor battery temperature. The main purpose of this is, if the battery temperature exceeds the recommended 0 ¡ã C to 40 ¡ã C, the charging is prohibited. Unlike nickelicide or nickel-metal hydrogen batteries, the lithium ion battery has a very small temperature when charging.

The meaning of the letters "C" "C" is a battery term for indicating the battery discharge capacity specified by the battery manufacturer, and the unit is Mahr. For example, a rated 2000mAhR battery can be a 2000mA load power supply for one hour, and the battery voltage will fall to a zero-capacity voltage. In this example, charging the battery with C / 2 means charging at 1000 mA (1A).

The letter "C" becomes important in the battery charger, because it determines the appropriate charging current and time length required for the battery. When the minimum charging current termination method is discussed, the 2000mAHR battery at C / 10 will terminate the charging period when the charging current drops below 200mA. The main determinants of the factors that determine the floating voltage of the battery are the electrochemical potential of the active material used in the battery cathode, and the lithium is about 4V.

Increase other compounds will advance or reduce this voltage. The second factor is a balance between battery capacity, cycle life, battery life and security. Most lithium-ion battery manufacturers have set a 4.

2V floating voltage to the best balance between capacity and cycle life. When using 4.2V as a constant limit value (floating voltage), the battery can generally provide about 500 charging / discharge cycles, and then the battery capacity is reduced to 80%.

A charging cycle consists of a full charge to a full discharge process. Multiple shallow discharge processes together constitute a full charge cycle. Although the battery capacity is charged to less than 100% by lowering the floating voltage or the lowest charging current to terminate, the battery capacity is initially reduced, but with the number of cycles increase to more than 500 times, the battery capacity of the lower floating voltage can exceed the higher floating voltage.

battery capacity. Regarding the number of capacity and charging cycles, Figure 2 shows the comparison of the recommended floating voltage and reduces floating voltage. Since different lithium-ion battery chemical materials and other conditions may affect battery life, the curve shown in this paper is only estimated charging cycle and battery capacity value.

Due to the small difference of battery materials and production methods, similar batter chemical materials from different manufacturers may also produce a result of the aforemention, the battery manufacturer specifies the charging method and floating voltage that the ultimate user must use to meet the battery capacity. Periodic life and safety specifications. Do not recommend charging to higher than recommended floating voltage.

Many batteries contain battery pack protection circuits, if exceeded the highest battery voltage, the circuit temporarily disconnects the battery connection. Once disconnected, connect the battery pack to the charger, generally reset the battery pack protection circuit. A voltage value is often printed on the battery pack, such as a single battery of 3.

6V. This voltage is not a floating voltage, but a uniform battery voltage at the time of battery discharge. Select the battery charger to extend battery life, although battery charger does not control the depth discharge of the battery, all of these factors have an impact on battery life, and many charging has the ability to extend battery life, and Sometimes you can greatly extend battery life.

Battery charger extension battery life is mainly determined by the floating voltage and charging termination method of charger. Many lithium-ion batteries of Lingllet have a fixed floating voltage of 4.2V ¡À 1% (or lower), but there are some products of 4.

1V and 4.0V and with adjustable floating voltages. Method of charging and discharging method of lithium-ion battery life: Linglrt company Franhoffart has always attached great importance to the capacity of lithium-ion battery, in order to achieve the longest product working hours with the smallest physical dimension.

However, in some applications, longer battery life, less charging, or more secure batteries more important than battery capacity. This article describes several lithium-ion batteries that can greatly extend battery life. Almost all high-performance portable products use a rechargeable lithium ion battery including a lithium ion polymer battery, which is due to other rechargeable batteries, a lithium ion battery has a high energy density, a higher battery.

Voltage, self-discharge, very long cycle life, and simple charging and maintenance. In addition, due to its relatively high voltage (2.9V to 4.

2V), many portable products can be operated with a single battery, thereby simplifying product overall design. Deciding that the lithium-ion battery cycle life or service life does not exist any single factors that extend or shorten battery life, and often combine several factors to play a role. In terms of prolonging cycle life, there is a way to extend battery life: 1.

Partial discharge practice. Use only 20% or 30% battery capacity before charging, greatly prolong the cycle life. As a general rule, 5 to 10 shallow discharge cycles are 1 full discharge cycle.

Although some discharge cycles may reach thousands, keep the battery in full charge and shorten battery life. If possible, the full discharge cycle should be avoided (drop to 2.5V or 3V, depending on the chemical material).

2. Avoid 100% of charging to capacity. Choose a lower floating voltage to do this.

Reducing the floating voltage will progressively life and service life, and the cost is to reduce battery capacity. The floating voltage is reduced by 100mV to 300mV to extend the period life of 2 to 5 times or longer. Lithium-ion cobalt chemical materials more sensitive to higher floating voltages compared to other chemical materials.

Lithium phosphate ion battery is generally lower than the floating voltage of the more common lithium-ion battery. 3. Select a suitable charging termination method.

Choose a charger using the minimum charging current to terminate (C / 10 or C / X), by 100% of the capacity, can also extend battery life. For example, the current falls to the C / 5 to end the charging cycle similar to the effect of falling the floating voltage to 4.1V.

In both cases, the battery is only charged to about 85% of the capacity, which is an important factor in determining the life of the battery. 4. Limit the battery temperature.

Limit the limit temperature of the battery to extend battery life, especially for charging at 0 ¡ã C or less. Charging the metal below 0 ¡ã C to promote the plating of the metal on the battery, which may cause internal short circuits, generating heat and make the battery unstable and unsafe. Many battery chargers have a device with a measure of battery temperature to ensure that it does not charge at extreme temperatures.

5. Avoid large charging and discharging current, because this will shorten the period of cycle. Some chemical materials are more suitable for large current, such as lithium ion manganese and lithium phosphate ion batteries.

High current exerts excessive pressure to the battery. 6. Avoid depth discharge below 2V or 2.

5V, because this will quickly damage lithium-ion batteries. Internal metal plating may occur, which causes short circuit to make the battery are not available or unsafe. Most lithium-ion batteries have an electronic circuit in the battery pack.

If charging or discharge, the battery voltage is below 2.5V, more than 4.3V or if the battery current exceeds a predetermined threshold, the electronic circuit will disconnect the battery connection.

The recommended method of charging the lithium ion battery is to provide a constant current of ¡À 1% compression to the battery until the battery is covered with electricity, and then stop charging. Methods used to determine when the battery is covered with electricity includes: giving a total charging time, monitoring charging current or using these two methods. The first method uses a constant pressure constant current, and the variation ranges from C / 2 to 1C for 2.

5 to 3 hours to allow the battery to charge 100%. You can also use a lower charging current, but it will take longer. The second method is similar to the first method, just requires monitoring charging current.

As the battery is charged, the voltage rises, which is exactly the same as the first method. When the battery voltage reaches the program limit value (also known as a floating voltage), the charging current begins to decline. When the current falls, the battery is charged to 50% to 60% of the capacity.

The floating voltage continues until the charging current drops to a low level (C / 10 to C / 20), when the battery is charged to 92% to 99%, the charging cycle is terminated. At present, it is necessary to quickly charge (less than 1 hour) to 100% of the standard lithium-ion battery, no safety method. It is not recommended to add a continuous voltage to the battery after the battery is full, since this will accelerate the loss of permanent capacity, and may cause internal lithium metal plating.

This plating may develop into internal short circuit paths, causing overheating, so that the battery is unstable when the battery is hot. The time required for a few months. Some lithium ion battery chargers promise to use thermal resistance to monitor battery temperature.

The main purpose of this is, if the battery temperature exceeds the recommended 0 ¡ã C to 40 ¡ã C, the charging is prohibited. Unlike nickelicide or nickel-metal hydrogen batteries, the lithium ion battery has a very small temperature when charging. The meaning of the letters "C" "C" is a battery term for indicating the battery discharge capacity specified by the battery manufacturer, and the unit is Mahr.

For example, a rated 2000mAhR battery can be a 2000mA load power supply for one hour, and the battery voltage will fall to a zero-capacity voltage. In this example, charging the battery with C / 2 means charging at 1000 mA (1A). The letter "C" becomes important in the battery charger, because it determines the appropriate charging current and time length required for the battery.

When the minimum charging current termination method is discussed, the 2000mAHR battery at C / 10 will terminate the charging period when the charging current drops below 200mA. The main determinants of the factors that determine the floating voltage of the battery are the electrochemical potential of the active material used in the battery cathode, and the lithium is about 4V. Increase other compounds will advance or reduce this voltage.

The second factor is a balance between battery capacity, cycle life, battery life and security. The illustration curve shows the relationship between battery capacity and cycle life. Newmaker.

com Charger Floating Voltage and Battery Capacity and Periodic Life Most Lithium Ion Battery Manufacturers have a 4.2V floating voltage to be the best balance between capacity and cycle life. When using 4.

2V as a constant limit value (floating voltage), the battery can generally provide about 500 charging / discharge cycles, and then the battery capacity is reduced to 80%. A charging cycle consists of a full charge to a full discharge process. Multiple shallow discharge processes together constitute a full charge cycle.

Although the battery capacity is charged to less than 100% by lowering the floating voltage or the lowest charging current to terminate, the battery capacity is initially reduced, but with the number of cycles increase to more than 500 times, the battery capacity of the lower floating voltage can exceed the higher floating voltage. battery capacity. Regarding the number of capacity and charging cycles, Figure 2 shows the comparison of the recommended floating voltage and reduces floating voltage.

Newmaker.com Periodic Life and Capacity and Capacity and 4.2V Floating Voltage Since different lithium-ion battery chemical materials and other conditions may affect battery life, the curve shown in this paper is only the estimated charging cycle and battery capacity value.

Due to the small difference of battery materials and production methods, similar batter chemical materials from different manufacturers may also produce a result of the aforemention, the battery manufacturer specifies the charging method and floating voltage that the ultimate user must use to meet the battery capacity. Periodic life and safety specifications. Do not recommend charging to higher than recommended floating voltage.

Many batteries contain battery pack protection circuits, if exceeded the highest battery voltage, the circuit temporarily disconnects the battery connection. Once disconnected, connect the battery pack to the charger, generally reset the battery pack protection circuit. A voltage value is often printed on the battery pack, such as a single battery of 3.

6V. This voltage is not a floating voltage, but a uniform battery voltage at the time of battery discharge. Select the battery charger to extend battery life, although battery charger does not control the depth discharge of the battery, all of these factors have an impact on battery life, and many charging has the ability to extend battery life, and Sometimes you can greatly extend battery life.

Battery charger extension battery life is mainly determined by the floating voltage and charging termination method of charger. Many lithium-ion batteries of Lingllet have a fixed floating voltage of 4.2V ¡À 1% (or lower), but there are some products of 4.

1V and 4.0V and with adjustable floating voltages. The table below shows some battery chargers with lower floating voltage, which can extend battery life when charging 4.

2V lithium-ion battery. Provides lower floating voltages to extend battery life of battery charges NewMaker.com does not provide battery chargers that provide lower floating voltage options can also extend battery life.

The battery life can be extended by selecting a minimum charging current termination method (C / 10 or C / X) by selecting the charging cycle at the appropriate charging current value. C / 10 Termination only only charges the battery to 92% of its capacity, but will work with progressive period. C / 5 termination can be doubled, but the battery charging is further reduced to about 85% of the capacity.

Can long working hours and long battery life? If the current battery technology is used, it does not increase the size of the battery, then the answer cannot be. To achieve the longest working time, the charger must charge the battery to 100% of the capacity. At this time, the battery voltage is close to the floating voltage recommended by the manufacturer, typically 4.

2V ¡À 1%. Unfortunately, charging the battery to this voltage value and keeping the battery life at this voltage value. One way is to choose a lower floating voltage, prohibit battery 100% charging, but this requires higher capacity battery to achieve the same long working time.

Of course, in many portable products, you may not choose a larger size battery. The use of C / 10 or C / X minimum charging current termination method is the same as the battery life like the battery life. The floating voltage is reduced by 100mV, which will be reduced by about 15%, but the cycle life can be extended.

At the same time, the charging current is reduced to 20% (C / 5), and the capacity is also reduced by 15%, and the cycle life can be extended. Typical lithium-ion battery output voltage can be expected, discharge, slow down when discharge is discharged. The change in discharge voltage curve depends on several factors, including discharge current, battery temperature, battery aging, and anodic material type used for battery.

Currently, most lithium-ion batteries use coke or graphite. The voltage curve of each battery is shown in the figure. The discharge voltage varies widely between 20% and 80% of the capacity of the graphite material, and then rapidly decreases at the end, and the coke anode has a relatively steep voltage slope and a lower 2.

5V cutoff voltage. When using coke materials, the remaining battery capacity is easier to determine, and the battery voltage is simply measured. In parallel or series-connected battery for progressive capacity, lithium ion batteries are often connected in parallel.

In addition to the battery, the same chemical material must be used, from the same manufacturer and size, no other special requirements. The tandem connected battery needs to be careful, since battery capacity matching and battery balancing circuits often need to ensure that each battery reaches the same floating voltage and the same charging level. Contact two batteries in series (with respective battery pack protection circuits) are not recommended, due to capacity mismatch, thereby disconnecting battery connections.

In addition, multiple battery packs that have been assembled from the battery manufacturer should be purchased from the battery manufacturer. The life of this paper is determined by many factors, and most importantly, battery chemical materials, discharge depth, battery temperature and battery capacity termination value. 100% capacity to the battery to charge to the manufacturer can reach the number of full charge / discharge cycles announced by the manufacturer.

Select the charger that promises to charge to a capacity of less than 100%, will make the application that need to extend battery life greatly benefited, this is achieved by selecting a battery charger having a lower floating voltage or earlier end ch.