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What is the charging voltage of a lithium iron phosphate battery pack?

The charging voltage of the lithium iron phosphate battery pack 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 too high a voltage can easily damage the battery. If the 3.6V voltage is lower than this indicator, there will be no overcharging. If the battery is set to a minimum of 3.0V for charging, then 3.4V is 0.4V higher than the minimum, and 3.6 is 0.6V higher than the minimum. This additional 0.2V can release half of the battery's energy, which means that every time the battery is charged, half of the usage time is longer than 3.4V. Since the battery is used a certain number of times, its lifespan is increased by half. Therefore, adding charging voltage without damaging the battery will increase the battery's lifespan.

The design of a 3.6V charging limit for a lithium iron phosphate battery pack must be based on the actual use of the lithium-ion battery. It can fully activate the battery capacity to its maximum without damaging the battery. The number of charging cycles refers to the number of complete charge and discharge cycles. Although the design of 3.4V does not have overcharging, a small portion will not participate in the cycle charging and discharging, and most of the participants will still experience performance degradation due to the increase in the number of cycles, leading to a vicious cycle until they cannot be used. This is due to its lifespan limitation, the inevitable overlap of various harmful and unfavorable factors that cannot be prevented, and the inability to maintain the original design parameters in terms of performance.

What are the charging methods for lithium iron phosphate battery packs?

(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 lithium 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 ion battery pack while minimizing gas evolution and water loss.

(2) Constant current charging method: Throughout the entire charging process, the charging current is kept constant by adjusting the output voltage. Keeping the charging current constant results in a relatively low charging rate. The constant current charging control method is simple, but the acceptable current capacity of the lithium iron phosphate battery pack gradually decreases with the charging process. In the later stage of charging, the charging capacity of the power lithium battery decreases, and the charging current utilization rate is greatly reduced.

(3) Constant current and constant voltage charging method: In the first stage, constant current charging method is used to prevent excessive charging current at the beginning of constant voltage charging. The second stage adopts constant voltage charging method to prevent overcharging caused by constant current charging. Lithium iron phosphate battery pack, like any other sealed rechargeable battery, requires control over charging and cannot be overcharged, otherwise it is easy to damage the battery. Lithium iron phosphate battery packs generally adopt a charging method of constant current followed by voltage limitation.

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