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How to charge lithium iron batteries and what is the charging voltage? What are the tips for charging lithium iron phosphate batteries? The charger of iron lithium batteries is different from ordinary lithium batteries, with a maximum termination charging voltage of 4.2 volts for lithium batteries; The lithium iron phosphate battery is 3.65 volts. How to properly charge iron lithium batteries? Now let the editor of Storage Electric introduce the charging method and voltage of lithium iron phosphate batteries to you!

Lithium iron batteries: Lithium iron batteries are a type of battery in the lithium battery family, with the main positive electrode material being lithium iron phosphate. Compared with traditional lead-acid batteries, lithium-ion batteries have significant advantages in operating voltage, energy density, cycle life, and other aspects.

Compared with traditional lead-acid batteries, lithium iron phosphate batteries have the following advantages:

(1) High energy density: nominal voltage is 3.2V, energy density is about 4 times that of lead-acid batteries, small in size and light in weight;

(2) Strong safety: Lithium iron phosphate cathode material has good electrochemical performance, the charging and discharging platform is very stable, the structure is stable during the charging and discharging process, and the battery does not burn, explode, and has good safety;

(3) Good high-temperature performance: The battery operates normally at an external temperature of 55 ℃;

(4) High power output: standard discharge of 0.2C, capable of 3C charging and discharging;

(5) Long cycle life: Charge and discharge at room temperature of 1C, and the capacity of the monomer is still greater than 80% after 2000 cycles;

(6) Environmental protection: The entire production process is clean and non-toxic, and all raw materials are non-toxic.

How to charge iron lithium batteries?

When charging a lithium iron battery, it is connected to a balanced charging board through a ribbon cable, which is usually connected in series from both ends for overall charging. The voltage of the charger is greater than the voltage of the battery pack. The voltage of each individual battery cell is detected by the ribbon cable, which is equivalent to parallel connection of multiple voltage regulators. The charging voltage of each individual cell will not exceed the voltage regulator value, while other individual batteries continue to charge through the bypass of the voltage regulator.

Because at this point, the battery of each individual cell is almost fully charged, and it is only balancing each cell, so the charging current is small. To supplement the balance, each cell is fully charged. The charger can only protect the voltage at the end of the entire battery pack. The balanced charging board ensures that each unit is overcharged and fully charged, and cannot stop the entire battery pack charging due to one battery cell being fully charged.

1. Some mobile phone chargers themselves have protection, and when the lithium battery voltage reaches 4.2 volts, they stop charging. My idea is to connect a slightly higher power silicon diode (with a forward voltage drop of about 0.6 volts) in series between the lithium iron phosphate battery and the charger. When the voltage of the lithium iron phosphate battery reaches 3.6 volts and the diode voltage drop is exactly 4.2 volts, it can also be detected by the charger and stop charging.

2. The protective circuit of the mobile phone battery is removed and used for charging protection of lithium iron phosphate batteries. According to the above principle, a diode is connected in series during charging to provide 4.2V protection.

The correct charging method for lithium iron phosphate batteries:

(1) Constant voltage charging method: During the charging process, the output voltage of the charging power supply remains constant. As the state of charge of the power battery changes, the charging current is automatically adjusted. If the specified constant voltage value is appropriate, it can ensure the complete charging of the iron lithium battery while minimizing gas evolution and water loss.

(2) Constant current charging method: During the entire charging process, the charging current is kept constant by adjusting the output voltage. Keeping the charging current constant, the charging rate is relatively low. The constant current charging control method is simple, but due to the fact that the acceptable current capacity of lithium iron phosphate batteries gradually decreases with the charging process, the power battery's charging capacity decreases in the later stage of charging, and the charging current utilization rate is greatly reduced.

(3) Constant current and constant voltage charging method: In the first stage, the constant current charging method is adopted to avoid excessive charging current at the beginning of constant voltage charging. The second stage adopts a constant voltage charging method to avoid overcharging caused by constant current charging. Lithium iron phosphate batteries, like any other sealed rechargeable batteries, need to be controlled for charging and not overcharged, otherwise it is easy to damage the battery. Lithium iron phosphate batteries generally adopt a charging method of constant current followed by voltage limitation.

Reminder: Lithium iron phosphate batteries should be waterproof and dustproof when used, so the storage area should not have water, which will affect the performance and service life of the battery.

What is the charging voltage of lithium iron batteries?

The charging voltage of lithium iron phosphate batteries should be set at 3.65V, with a nominal voltage of 3.2V. Generally, the maximum charging voltage can be 20% higher than the nominal voltage, but if the voltage is too high, it can easily damage the battery. If the voltage is lower than this indicator, there is no overcharging. If the battery is set to a minimum of 3.0V and needs to be charged, then 3.4V is 0.4V higher than the minimum, and 3.6 is 0.6V higher than the minimum. This 0.2V can release half of the energy, which means that each charge takes half more time than 3.4V. Since the battery is used a certain number of times, increasing the charging voltage will increase its lifespan by half. Therefore, without damaging the battery, increasing the charging voltage will increase its lifespan.

The design of 3.6V charging limit for lithium iron phosphate batteries must start from the practical application of lithium batteries, which can fully activate the battery capacity to the maximum without damaging the battery. The number of charging cycles refers to the number of complete charging and discharging cycles. Although there is no overcharging in the design of 3.4V, there will be a small number of people who do not participate in cyclic charging and discharging, and most of them will still have poor performance due to the increase of cycle times, leading to a vicious cycle until they cannot be used. This is the limitation of its lifespan, and the inevitable combination of various harmful and unfavorable factors makes it impossible to maintain the original design parameters in terms of performance.

The above is an introduction to the charging method and charging voltage of iron lithium batteries. Nowadays, the form of batteries is no longer limited to ordinary batteries, and more and more types of batteries are widely used in our lives. Therefore, it is necessary to use the correct charging method to charge lithium iron phosphate batteries.

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