1. EUSO BALLOON Battery Power Pack (PWP) RIKEN/UAH Héctor Prieto, Katsuhiko Tsuno, Marco Casolino 1

2. Maintain constant power of 225 W for the phone booth and during the time required for the mission, in this case 24 hours of flight. Zero levels of overloading the circuit due to problems with the battery Zero levels of overheating in the circuit due to problems with the battery Mission Objectives with success criteria 2

3. Battery Pack technical specifications Phone Booth 24hPhone Booth 12h Altitude40km Pressure3mBar Power225W/192.72Ah, 28V25W/96.42Ah, 28V Operation Duty 24h12h Operating Temperature Range within -40˚C/+70˚C Size(500.4x300.24x170)mm (225W) (500.4x170.12x170)mm (225W) Mass27.14kg14.4kg 3

4. Battery Pack design description Objectives  PWP shall provide the primary power in 30 hours minimum which includes 24 hours level flight and rising operation.  PWP shall provide the primary power in 10 hours minimum including 2 hour level flight and rising operation.  PWP shall provide the average power of 225W to the Phone Booth  PWP shall provide enough transient current generated at instrument booting.  PWP shall be protected from the instrument overload by the fuse, circuit breaker or current limiter. 4

5. Battery Pack design description Description At the moment we assume a battery system providing 28V; since the highest voltage is 28V (and HV is produced internally). The battery pack will be attached to the gondola and provide power to the LV board and the HK board. Relays (commanded by CNES) will control the power ON/OFF. 5

6. Battery Pack connection diagram Phone Booth/12 and 24hrs 6

7. Battery Pack Phone Booth/12hrs Component Battery Component Selected: Saft G62/1.2 Specification: Li-SO2/28V/34.5Ah Capacity = (Watts required/Volts required)*(Time Hours) Battery Selection Capacity @ 24hours = (225W/28)*(24h)=96.42Ah 3 of 10 Cell Series Saft G62/1.2 = 103.5Ah 7

8. Battery Pack Mechanical Architecture Phone Booth/12hrs 8

9. Battery Pack Phone Booth/24hrs Component Battery Component Selected: Saft G62/1.2 Specification: Li-SO2/28V/34.5Ah Capacity = (Watts required/Volts required)*(Time Hours) Battery Selection Capacity @ 24hours = (225W/28)*(24h)=192.72Ah 6of 10 Cell Series Saft G62/1.2 = 207Ah 9

10. Battery Pack Mechanical Architecture Phone Booth/24hrs 10

11. Battery Pack Mechanical Architecture Phone Booth/24hrs 11

12. Battery Pack Weldering Saft G62/1.2 nickel strips weldering conditions 12

13. Saft batteries typical discharge characteristics Saft G62/1.2 typical discharge characteristics 13

14. Mass Estimation 14

15. Upperside and Under side Front Face and Back Face 150.12mm Battery Box Phone Booth/12hrs 500.4 mm 150.12 mm 170 mm Lateral 500.4 mm 170 mm Mass Calculations Density = Aluminum Box = 2.69g/cm3 = 0.00269g/mm3 Thickness = 3mm Lateral Sides Volume = LSV= 500.4mm*170mm*3mm*2*0.00269g/mm3 = 1373g Upper and Under Side Volume = USV = 500.4mm*150.12mm*3mm*2*0.00269g/mm3 = 1212.43g Front and Back Face Volume = FBV= 170mm*150.12mm*3mm*2*0.00269g/mm3 = 412g Total Case Mass = LSV + USV + FBV = 1373 + 1212.43+412 = 3kg TOTAL MASS INCLUDING CELLS AND CASE = (30Cells*300g) + (Case Mass = 3kg) = 12kg+20% of margin = 14.4kg 15

16. Upperside and Under side Front Face and Back Face 300.24 mm Battery Box Phone Booth/24hrs 500.4 mm 300.24 mm 170 mm Lateral 500.4 mm 170 mm Mass Calculations Density = Aluminum Box = 2.69g/cm3 = 0.00269g/mm3 Thickness = 3mm Lateral Sides Volume = LSV= 500.4mm*170mm*3mm*2*0.00269g/mm3 = 1373g Upper and Under Side Volume = USV = 500.4mm*300.24mm*3mm*2*0.00269g/mm3 = 2423g Front and Back Face Volume = FBV= 170mm*300.24mm*3mm*2*0.00269g/mm3 = 824g Total Case Mass = LSV + USV + FBV = 1373 + 2423 +824 = 4.62kg TOTAL MASS INCLUDING CELLS AND CASE = (60Cells*300g) + (Case Mass = 4.62kg) = 22.62kg+20% of margin = 27.14kg 16

17. Battery Protection and Support Fire The Battery pack will have thermal fuse overheating protector which will protect the PWP against fire risk Explosion The box itself will be a protection against explosion due to the batteries will be confined there Breaking This mechanical issue shall be discused with the mechanical engineers in charged of the EUSO-Balloon mechanical Structure Mechanical Support ECAL-Riken will provide the mechanical structure, which will be made of aluminum to avoid risk of explosion and fire propagation. (TBD) 17

18. Battery Cells, Connectors and Cables Cells Connectors Cables Option I: In case of 225W /12hrs power consumption it will be necessary 30 cells of Saft G62/1.2 Option II: In case of 225W /24hrs power consumption it will be necessary 60 cells of Saft G62/1.2 The Connectors we are going to use are 9 pins D-Sub connectors for all interfaces and subsystems. The Cables we are going to use are THERMAX MIL-DTL-22759/91,92 for all interfaces and subsystems. 18

19. Battery Switches, Fuses Voltage Regulator Fuses The Fuses we are going to use are Thermal Fuse Klixon C Series and MIL-PRF-23419 Space Coast IC The Switches we are going to use are APEM-M3500 19

20. Why using 225W ? InterfacePower Consumption High Voltage Power Supply9.2W LVPS DP/17.2W LVPS DP/27.2W LVPS DP/37.2W LVPS-HK6W LVPS-PDM2.4W CPU14.4W CCB5W Data Storage18W GPS1.2W CLK3.6W Additional Spare15W HeatersTBC Total: 96.4W+20% of security Margin = 115.68W Additional Heaters and backup = 70W (188.7)+20% of security Margin = 222W This version should be discussed 225W 20

21. Battery Pack Budget Phone Booth /225W 12 and 24hrs EquipmentSpecificationModelQuantityPrice/UnitTotal Pack Battery Option 3 Li-SO2/28V/34.5AhSaft G62/1.23075.5€TBD Switch V: 28V; worse scenario 20V W =225W Current = 12.5A; Steady Current=225/20=11.25A*2PWP in parallel = 22.5A Temp = -40 0 C /+70 0 C APEM-M3500 10 TBC Thermal Fuse V: 28 V W: 225W Steady Current = 225W/20V+Security range = 11.25A+50% security range= 17A. Temp = -40 0 C /+70 0 C Thermal Fuse Klixon C Series 10 TBD Electrical Fuse V: 28 V; worse scenario =20V W: 225W Steady Current = 225W/20V = 11.25A Temp = -40 0 C /+70 0 C MIL-PRF-23419 Space Coast IC 50TBC Cable V: 20V W =225W Current = 11.25A Temp = -40 0 C /+70 0 C. AWG= 14 THERMAX MIL- DTL- 22759/91,92 30m 230$ 21

22. THANK YOU!!! 22