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Are you ready to embark on your DIY battery assembly journey? Today, we will show you how to connect three 18650 batteries in series!
You need to prepare the following materials: three 18650 lithium batteries, a battery fixing protection board, nickel material, adhesive, etc. Ensure that the voltage and internal resistance of your batteries meet the requirements and check whether the appearance is damaged.
Arrange your batteries in the correct polarity order. Since we need to connect the batteries in series, positive is connected to positive and negative is connected to negative. You can use silicone or other fixing materials to fix the batteries together to ensure that they will not loosen during the assembly process.
Use nickel material to connect the batteries in series. Ensure a firm connection and correct connection of positive and negative poles to avoid reverse connection. This is a very crucial step because if the connection is wrong, it may lead to battery short circuit or damage.
After connecting all the batteries, you need to install the battery protection board. Connect the protection board to the battery pack and follow the protection board's instructions for correct connection and setting. The protection board can prevent excessive charging and discharging of the battery, thereby protecting your battery pack from damage.
Finally, tidy up the wiring of the battery pack to ensure that the wiring is neat and fix it with adhesive or other fixing methods. This can make your battery pack more beautiful and safe.
After completing the above steps, you can use professional battery testing equipment or tools to test your battery pack. Ensure that the voltage, capacity, internal resistance and other parameters of the battery pack meet the requirements to ensure that your battery pack can work normally.
During the assembly process, be sure to pay attention to safety matters! Avoid short circuits and prevent excessive charging and discharging of the battery. If you are not sure whether your operation is correct or safe, please be sure to seek help from professionals or purchase a pre-assembled battery pack.
Precautions for parallel and series connection of lithium batteries:
Generally, when lithium batteries are used in parallel and series connection, lithium battery cell pairing is required. The pairing criteria are: the voltage difference of lithium battery cells is ≤3mV, the internal resistance difference of lithium battery cells is ≤5mΩ, and the capacity difference of lithium battery cells is ≤10mA.
When batteries are connected in parallel, the same kind of battery must be used. Different batteries have different voltages. After being connected in parallel, batteries with high voltage charge batteries with low voltage, consuming electrical energy.
The same kind of battery should also be used when batteries are connected in series. Otherwise, after batteries with different capacities are connected in series (such as different degrees of newness and oldness of the same kind of battery), the battery with small capacity will discharge first, and the internal resistance will increase. At this time, the battery with large capacity will discharge through the internal resistance of the battery with small capacity and consume electrical energy. It will also reverse charge it. In this way, the voltage on the load will be greatly reduced and it cannot work. The battery with large capacity is only equivalent to the battery with small capacity.

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