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(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 lithium iron phosphate battery pack changes, the charging current is automatically adjusted. If the specified constant voltage value is appropriate, it can ensure the complete charging of the power lithium battery while minimizing gas evolution and water loss. This charging method only considers the variation of battery voltage as a single state and cannot effectively reflect the overall charging status of the battery. Its initial charging current is too high, often causing damage to the power lithium battery. Given this drawback, constant voltage charging is rarely used.

(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 because the acceptable current capacity of lithium-ion battery packs gradually decreases with the charging process, in the later stage of charging, the charging capacity of power lithium batteries decreases, and the charging current utilization rate is greatly reduced. The advantages of this method are simple operation, convenience, easy implementation, and easy calculation of charging capacity.

(3) Constant current and constant voltage charging method: This charging method is a simple combination of the above two. The first stage adopts a constant current charging method to prevent excessive charging current at the beginning of constant voltage charging. The second stage adopts a constant voltage charging method to prevent overcharging caused by constant current charging. The lithium iron phosphate battery pack, like any other sealed rechargeable battery, requires control over charging and should not overcharge, as it can easily damage the battery. Lithium iron phosphate batteries generally adopt a charging method of constant current followed by voltage limitation.

(4) Chopping charging method: Using chopping method for charging. In this method, the current of the constant current source remains unchanged, while the switching tube is controlled to turn it on for a period of time and then off for a period of time, in a cyclic manner. The advantage of this method is that when the battery is charged through an external circuit, the ions inside the battery need to have a certain response time. If it is continuously charged, it may reduce its potential capacity. After charging for a period of time, adding a shutdown time can allow the ions appearing at the two poles of the battery to undergo a diffusion process, giving the battery a digestion time. This will greatly increase the battery's utilization rate and improve the charging effect.

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