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(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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