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Charging method of Lithium iron phosphate ion battery

Lithium rechargeable batteries have been widely used. Lithium iron phosphate ion batteries are used more and more because of their unique advantages. The charger of Lithium iron phosphate ion battery is different from that of ordinary lithium ion battery. The maximum termination charging voltage for lithium-ion batteries is 4.2 volts; The Lithium iron phosphate ion battery is 3.65V (some people on the Internet say that the maximum voltage cannot be higher than 3.8V). The question now is: can you use the mobile phone charger (slightly modified) to charge the Lithium iron phosphate ion battery; Or use the discarded lithium-ion battery protection circuit board (slightly modified) for charging protection of Lithium iron phosphate battery.

If the current of a series battery is consistent, the one with low capacity will be fully charged first when charging, but the overall voltage has not reached the charging cut-off voltage. Continuing to charge will overcharge, and the discharge will also be the same. If there are multiple cycles, it will be damaged, so there is always one of the worst in series batteries. The protection board is not a single charging device, but a protection device. If it is not equipped with equalization function, it is the worst way to fully charge and protect, but in reality, it is not fully charged as a whole. Even with a balanced protection board, it is still a false balance. By bypassing a resistor, the fully charged battery is bypassed and continued to be fully charged with other batteries to achieve the overall effect of full charging. Due to the limited power of the bypass resistor, 100mAh is usually very large, but in fact, for the entire battery pack, it is a waste of time. In fact, the balancing of series batteries can be said to be a world problem. There is no low-cost high-current balancing, and the larger the number of series connections, the more difficult it is to balance. In fact, because the overcharge and overdischarge of series batteries are difficult to control, and the overcharge and overdischarge of lithium batteries are extremely fast, as well as safety problems, the Lithium iron phosphate, which is developed only because of its low capacity and energy, is inferior to lithium batteries in all aspects. It is because it is resistant to overcharge and overdischarge that it is widely used.

The detection line of the protection board should not be thick, while the red and black lines are the power supply lines, and the current passing through them should be thick. The protection board is used to detect the voltage of each individual cell, which not only protects each cell from discharging but also from charging. Otherwise, it cannot discharge or charge through the protection board and serves as a protective purpose.

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