How to make a 12v 18650 battery pack?
- The number of cells
First of all, make a simple calculation according to the requirements of the battery pack for capacity and voltage, determine the capacity in parallel, and solve the voltage in series.
2. Connection method
Since the lithium battery is strictly prohibited from overcharging and over-discharging, a protection board should be added. This determines that the battery pack must be connected in a parallel-to-serial mode. That is, connect 15 cells in parallel and then in series. This connection method has high requirements on the consistency of the cells, so it is necessary to do some classification and pairing work. That is, the internal resistance should be connected in parallel with the same or close resistance as possible.
3. Protection board connection
Lithium battery protection boards are now sold online with many finished products. Connect the battery and the protection board as shown below.