Simple 3S1P battery pack for 21700 cells

The purpose of this battery was to make a simple and small 3S battery which helps when testing components, such as electric motors. Before building a bigger battery pack dedicated to the project. The 3D models were developed in Onshape.

Base part of the battery pack
Top part of the battery pack

Building

It is important to not solder directly on the battery packs since the heat can damage the cells. Therefore the wires was soldered first to the nickel strips and then spot welded to the cells.

Picture of the nickel strips
The nickel strips.
Picture of the BMS that was used
The BMS that was used.
Picture of the 21700 cells placed in the based
21700 cells placed in the base.
Picture of spotwelded nickel strips.
Spot welded nickel strips.
Picture of the layout of the cells.
The layout of the cells.
Picture of the finished battery pack.
The finished battery pack.