Lab 3 - Battery Pack

Rechargeable Lithium Battery Pack A two cell, rechargeable lithium-ion battery cell was made. This pack was made in order to analyze the charge and discharge behavior, internal resistance, and performance of lithium-ion cells.

1. Two 3300mAh 18650 lithium ion battery cells

2. One 2S battery management system (BMS) board

3. One pair (male/female) XT-30 battery connectors 

4. One piece pure nickel battery tab (0.15mm thick, 8mm wide) 

5. Two pieces (BLK/RED) 14 gauge battery lead wire 

6. One piece large shrink tube 

The first step is to spot weld the BMS board to each end of the two battery cells using the pure nickel battery tab. This should be connected in a way that the B+ and B- tabs of the BMS are connected to their respective ends of the batteries. The opposite end of the BMS is to be connected in parallel to the remaining two battery terminals (as seen in cover image). 

Before moving any further, the battery pack should be tested with a voltmeter to ensure proper flow of electricity. With these two specific cells, a valid result would rest around 3.7 volts. 

The final step for assembling the battery pack is to shrink wrap. This can be done by using the piece of shrink wrap material and applying a heat gun until the components are tightly wound together. The pack can then be safely charged using an iMax B6 Multi-chemistry Battery Charger.  

The charging system used will be the iMax B6 Multi-chemistry Battery Charger. The Battery charger can charge 4 batteries at the same time.

We can analyze the performance of the battery by discharging the battery from full charge. The discharge system used will be the SkyRC BD250 Battery Discharger/Analyzer.