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How to test the protection board of lithium ion battery pack?

2021-10-12 09:02:12 0

How to test the protection board of lithium ion battery pack?

Acknowledge the correct connection of the battery cable with a multimeter;

After the measured voltage is normal, plug the cable into the protection board and measure the resistance between the protection board b- and P-. The resistance is 0, which means that they are well connected before and the protection board is good;

By connecting the b-line, measure the voltage of b- and the total positive electrode of the battery and the voltage of the P- and the total positive electrode of the battery. Together with the voltage, it means that the protection board is normal (the protection board is equivalent to a switch, the switch has been turned on, and the current can pass through safely). Example detection: b-to the battery's total positive voltage is 25.11VP-to the battery's total positive voltage is 25.11V. The two voltages together declare that the protection board is normal. Assuming that P- is discharged through a large current, there will be a slight voltage drop, and the protection board will generate heat (about 50 degrees), which is normal.

Precautions for testing lithium-ion battery protection board

1. When measuring each string of voltage, the meter pens are placed correctly, and they will short-circuit and smoke when they touch each other;

2. When connecting the protection board, be sure to connect the cable first and then plug the protection board. Plugging in the protection board may cause the protection board to burn out.

As a safety protection device for lithium batteries, the lithium ion battery pack protection board must not only be able to operate reliably within the normal operating current plan of the equipment, but also be active when the battery is accidentally short-circuited or over-current, so that the batteries can be protected . With the widespread use of lithium-ion batteries, lithium-ion battery pack protection boards have become more and more important. The chemical characteristics of lithium-ion batteries have chosen us to protect the voltage.

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