Fortunately [Adam Bender] is on hand with an extremely comprehensive two-part guide to designing and building lithium-ion battery packs from cylindrical 18650 cells. In one sense we think the two-parter is in the wrong order.
To make the battery pack, you have to first finalize the nominal voltage and capacity of the pack. Either it will be in terms of Volt, mAh/ Ah, or Wh. You have to connect the cells in parallel to reach the desired capacity (mAh ) and connect such parallel group in series to achieve the nominal voltage (Volt ).
With just a few simple tools and materials, you can make a high-quality battery pack that will last for years. Here’s what you’ll need to get started: -18650 lithium ion batteries (we recommend Panasonic NCR18650B batteries)-A soldering iron and solder-A DC power supply-An enclosure (we recommend a 3D-printed enclosure)
Once you have the lithium metal, you’ll need to create a battery cell. This can be done by using two pieces of copper wire and a piece of lithium metal. Next, you’ll need to connect the two pieces of copper wire to the lithium metal. This can be done by soldering the wires to the metal.
Li-ion cells are increasingly used as battery packs for many applications due to their high energy density and rechargeable characteristics. However, we must link a Li-ion cell with a BMS to safeguard the circuit from being destroyed or reducing the cell's life.
Start by soldering two cells together positive-to-negative. Then connect the two pairs of cells together, again positive-to-negative. Once all the cells are connected, you can solder on the positive and negative terminals. Make sure to cover the terminals with heat shrink tubing to avoid shorts. Now you have a completed battery pack!
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