What Are The Wiring Circuits And Methods For Lithium-Ion Battery Protection Boards?

The number of lithium-ion battery protection boards connected in series and the wiring methods vary. The wiring methods for common and separate terminals also differ. For precise information on each product, please refer to the specific parameters of the protection board. However, the overall wiring remains the same. Due to the reactivity of lithium-ion batteries, it is essential to use a protection board to prevent overcharging, over-discharging, and overcurrent. Below, we will explain how to wire a lithium-ion battery protection board.

The lithium-ion battery protection board is designed to protect the charging and discharging of the lithium-ion battery pack in series connection. During the operation of the equipment, it ensures that the voltage difference between each individual cell is less than the set value (generally ±20mV), achieving balanced charging for each cell in the battery pack and effectively improving the charging effect under the series charging mode. At the same time, it tests the overvoltage, under-voltage, overcurrent, short circuit and over-temperature conditions of each individual cell in the battery pack, protecting and extending the battery's service life. The under-voltage protection ensures that each individual cell avoids damage due to over-discharge during discharge use.

Lithium-ion batteries are always composed of a battery and a protection board. The 3 wires will only be found on the protection board, while the battery has 2 wires. The replacement is very simple (be careful of the positive and negative poles):

1. Remove the packaging of the original lithium-ion battery, and then use a soldering iron to separate the protection board from the battery.

2. Then remove the protection board of the new lithium-ion battery and connect the battery to the old protection board.

Connect P+ and P- to the output. Connect b+ to the positive terminal of the battery cell and b- to the negative terminal. If it is a multi-cell series connection, connect the negative terminal of b1 and the positive terminal of b2 together, and so on. The negative terminal of the last battery cell is connected to bn-. First, solder the wires, then connect the batteries. Do not connect them wrongly. After completion, if there is no output, remember to charge and activate the battery using a charger at the charging interface led by P+ and P-.

Some lithium-ion batteries have a third wire for temperature protection, while others are for checking battery information (such as an alarm will be triggered if a non-original factory battery is replaced). Lithium-ion batteries consist of a battery and a protection board.

How to connect the protection board for 36V lithium-ion batteries?

1. First, connect 12 lithium-ion batteries in series. If there are 24 cells, you can first parallel them and then connect them in series!

2. Connect according to b to the negative terminal of the battery pack. Follow the sequence: b1_b2_b3, etc., b10_b11_b12

3. Common interface: The positive electrode of the lithium-ion battery pack is the one used for charging and discharging. C: Can be used as the negative electrode for charging and discharging.

4. Separate interface: The positive electrode of the lithium-ion battery pack is the one for charging and discharging. C: Can be used as the negative electrode for charging. D: Can only be used as the negative electrode for discharging.