Is It Necessary to Add a Protection Board to Charge the Mobile Phone Lithium Battery Alone

The lithium battery of the used mobile phone supplies power to the small table lamp. Do you need to add a 4056 charging board to the lithium battery with internal protection board? To answer this question, we must first understand the role of lithium battery protection board and 4056 charging board.

We know that the mobile phone lithium battery is equipped with a protection board, which is used to prevent overcharge and over discharge of the lithium battery. When the lithium battery is overcharged or over discharged, the protection board can turn off the output of the lithium battery, so as to protect the lithium battery from damage. The charging termination voltage of mobile phone lithium battery is generally about 4.2V. If the lithium battery of waste mobile phone is installed in the small table lamp to supply power, the lithium battery must be charged with a single lithium battery charger with a charging termination voltage of 4.2V (see the figure below), so as to avoid damaging the lithium battery due to improper charging voltage.

If there is no 4.2V lithium battery charger as shown in the figure above, and you want to use a 5V mobile phone charger to charge the lithium battery inside the desk lamp, you need to add a 4056 charging board to process the voltage output by the mobile phone charger before charging the lithium battery.

The shape of the 4056 charging board is shown in the figure above. The USB interface at the input end can be connected with the 5V mobile phone charger through the charging line, and the bat and bat - at the output end are respectively connected with the positive and negative poles of the lithium battery. In this way, the 5V mobile phone charger can be used to charge the lithium battery inside the desk lamp.

The circuit schematic diagram of 4056 lithium battery charging board is shown in the above figure. The IC is a linear high current single lithium battery charging IC. Its input terminal is connected with 5V voltage, and the output of bat terminal (pin ⑤) is directly connected with a single lithium battery for charging. Its charging current can be set through the resistance connected outside pin ②, and the maximum current is not less than 1a.

The 4056 charging IC can also detect whether the lithium battery is fully charged. When the lithium battery is fully charged, the IC can automatically turn off the output and enter the micro power standby state. In addition, after the IC detects that the lithium battery is fully charged, its â‘¥ pin can also output a control signal to turn on the LED indicator.

To sum up, the mobile phone lithium battery is used to supply power to the desk lamp. If the 4.2V lithium battery charger is used for charging, there is no need to add 4056 charging board; If you charge with a 5V mobile phone charger, you need to add a 4056 charging board.

Is It Necessary to Add a Protection Board to Charge the Mobile Phone Lithium Battery Alone 1

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