Battery Test Log - spacecraft-design-lab-2019/documentation GitHub Wiki

Full Battery Pack 1

Test Number Date Objective Parameters Notes
1 20/1/28 Wear-in
  • Charge: 4.2V, mA
  • Discharge: 3.3V, mA
  • Vacuum Pressure: ~ -100 kPa
  • Discharge: min mAh
  • Constructed by wiring together 4x1317-1 and 4x1570-1 packs after passive balancing with __Ohm resistor

4x 1317 Battery Pack 1

Test Number Date Objective Parameters Notes
1 20/1/28 Wear-in
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Discharge: 7h33min 439mAh
2 20/1/29 Charge
  • Charge: 4.2V, 400mA
  • Charge: 1h47min 646mAh
  • Charged at 400mA on second cycle to accelerate test progress. 400mA still within tested capability since individual cell tests were done at 100mA.
3 20/2/24 ESR
  • 1 Ohm Resistor
  • Stored in freezer for 1 week prior
  • Measured voltage prior to load application: 4.1 V
  • Minimum voltage measured ~2.19 V
  • Measured load resistance prior to test: 1.7 Ohms
  • Measured load resistance after test: 3.5 Ohms
  • Calculated ESR: 1.5-3 Ohms for full pack, or 3-6 Ohms per cell
  • Battery cells passively balanced in parallel with 10kOhm resistor

4x 1570 Battery Pack 1

Test Number Date Objective Parameters Notes
1 20/1/28 Wear-in
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Discharge: 9h37min 616mAh
2 20/1/29 Charge
  • Charge: 4.2V, 400mA
  • Charge: 1h05min 394mAh
  • Charged at 400mA on second cycle to accelerate test progress. 400mA still within tested capability since individual cell tests were done at 100mA.
3 20/2/24 ESR
  • 1 Ohm Resistor
  • Stored in freezer for 1 week prior
  • Measured voltage prior to load application: 4.14 V
  • Minimum voltage measured ~2.25 V
  • Measured load resistance prior to test: 1.5 Ohms
  • Measured load resistance after test: 2.5 Ohms
  • Calculated ESR: 1.25-2 Ohms for full pack, or 2.5-4 Ohms per cell
  • Battery cells passively balanced in parallel with 10kOhm resistor

Battery 1317-1

Test Number Date Objective Parameters Notes
1 19/11/11 Wear-In
  • Charge: 4.2V, 100mA
  • Break 30min
  • Discharge: 3.3V, 100mA
  • Charge: 47min 70mAh
  • Discharge: 1h40min 128mAh
  • Temperature negligible or undetectable by thermistor throughout charge and discharge (max ~28C)
2 19/11/12-13 Wear-In
  • Charge: 4.2V, 100mA
  • Break overnight
  • Discharge: 3.3V, 100mA
  • Charge: 1h21min 118mAh
  • Discharge: 1h38min 124mAh
3 19/11/14-15 Wear-In
  • break overnight then Charge: 4.2V, 100mA
  • break overnight then Discharge: 4.2V, 100mA
  • Charge: 1h25min 124mAh
  • Discharge: 1h59min 152mAh
4 19/11/15 Wear-In
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: 1h21min 121mAh
  • Discharge: 1h46min 130mAh
5 19/11/18 Wear-In
  • break overnight then Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: min mAh
  • Discharge: min mAh
6 19/11/19 Vacuum Cycle
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: 1h32min 138mAh
  • Discharge: 2h05min 145mAh
7 19/11/20 Vacuum Cycle
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: 1h19min 119mAh
  • Discharge: 2h10min 147mAh
8 19/11/21 Vacuum Cycle
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: min mAh
  • Discharge: 2h12min 150mAh
9 19/11/22 Vacuum Cycle
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: 1h18min 112mAh
  • Discharge: min mAh
10 19/11/25-27 Vacuum Cycle
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: 1h13min 110mAh
  • Discharge: 2h16min 145mAh
11 19/11/28-30 Vacuum Cycle
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: 1h25min 120mAh
  • Discharge: min mAh
  • Balanced with 1317-2 for parallel testing
  • Battery punctured somehow between 12/4 and 12/5/19, removed from testing

Battery 1317-2

Test Number Date Objective Parameters Notes
1 19/11/19 Vacuum Cycle
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: 48min 70mAh
  • Discharge: 2h38min 144mAh
2 19/11/20 Vacuum Cycle
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: 1h18min 116mAh
  • Discharge: 2h42min 147mAh
3 19/11/21 Vacuum Cycle
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: min mAh
  • Discharge: 2h39min 147mAh
4 19/11/22 Vacuum Cycle
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: 1h17min 109mAh
  • Discharge: 2h06min 130mAh
5 19/11/25-27 Vacuum Cycle
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: 1h15min 111mAh
  • Discharge: 2h01min 142mAh
6 19/11/28-30 Vacuum Cycle
  • Charge: 4.2V, 100mA
  • Discharge: 3.3V, 100mA
  • Charge: 1h24min 118mAh
  • Discharge: 2h11min 128mAh
  • Balanced with 1317-1 for parallel testing

Batteries 1317-3/4

Test Number Date Objective Parameters Notes
  • Balancing passively with 10kOhm resistor as of 12/5/19
  • Mounted in battery test box with thermistor cutouts on 12/5/19

Batteries 1570-1/2

Test Number Date Objective Parameters Notes
  • Soldered in parallel to common XT60 connector on 12/4/19
  • Mounted in battery test box with thermistor cutouts on 12/4/19
  • Awaiting vacuum testing while 1317-3/4 balance

Notes

11/11/19 13:00 - Wear-In 1

  • Soldered XT60 connector to AdaFruit 1317
  • measured voltage 3.78 V
  • Want to charge at "quick charge" rate, 30mA, but min. charger output for iSDT D2 is 100mA
    • AdaFruit says to charge at 100mA on their website, and does not sell a charger capable of the rated charge current on the cell datasheets
    • Will charge at 100mA for "wear-in" cycles since we have no alternative, and follow test plan otherwise
  • Charged 70mAh in 47min
  • Wait 30min before discharge according to datasheet
  • Discharge at 100mA, lowest charger can do (max rated discharge for batteries is 1C5)
    • Charger only allows discharge between 3.2V and 3.4V, picking 3.3V
  • Discharged 128mAh in 1h40min
  • Capacity well below minimum rated on datasheet - probably artifact of much higher charge and discharge rates than rated

11/19/19 16:30 - Vacuum Cycle 1

  • Battery 1317-1 moved into battery donut at start of vacuum cycles
  • Battery 1317-2 fresh out of box into battery donut without wear-in
  • Vacuum chamber does not hold vacuum unless valve at chamber is closed, pump loses suction after a few minutes
  • First vacuum cycles constrained in battery donut, measured 7.85mm slot width and 8.00mm combined battery width
  • "vacuum" achieved is approximately -30inHg, but pressure gauge is sticky and does not have sufficient resolution to show asymptotic vacuum strength
⚠️ **GitHub.com Fallback** ⚠️