20V, 40 Ah Lithium Ion Polymer Battery for the Spacesuit

Darcy, Eric; Wilburn, Monique; Hall, Dan; Roth, Peter; Das Gupta, Sankar; Jacobs, Jim; Bhola, Rakesh; Milicic, Gordan; Vandemeer, Dave

NASA NTRS · 20080015779

20V, 40 Ah Lithium Ion Polymer Battery for the Spacesuit

Darcy, Eric·Wilburn, Monique·Hall, Dan·Roth, Peter·Das Gupta, Sankar·Jacobs, Jim·Bhola, Rakesh·Milicic, Gordan·Vandemeer, Dave

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Abstract

Objective: Consider a new battery design for EMU. Results: a) Electrovaya s aerospace cell production line is improving, but must further improve to achieve acceptable reliability; b) Completed functional, vibration, and thermal cycling of LIB; c) So far, electrical safety tests have produced good results; d) Completed functional, vibration, thermal cycling, power quality and EMI of LIB Charger; e) Completed CDR on 9/23/04; and f) Manufacturing Readiness Review for flight cell/battery production scheduled for Dec 04.

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Darcy, Eric, Wilburn, Monique, Hall, Dan, Roth, Peter, Das Gupta, Sankar, Jacobs, Jim, Bhola, Rakesh, Milicic, Gordan, Vandemeer, Dave. 2006-08-01. 20V, 40 Ah Lithium Ion Polymer Battery for the Spacesuit. https://ntrs.nasa.gov/citations/20080015779

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The Extravehicular Mobility Unit (EMU) suit currently has a silver-zinc battery that is 20.5 V and 45 Ah capacity. The EMU's portable life support system (PLSS) will draw power from the battery during the entire period of an EVA. Due to the disadvantages of using the silver-zinc battery in terms of cost and performance, a new high energy density battery is being developed for future use, The new battery (Lithium-ion battery or LIB) will consist of Li-ion polymer cells that will provide power to the EMU suit. The battery design consists of five 8 Ah cells in parallel to form a single module of 40 Ah and five such modules will be placed in series to give a 20.5 V, 40 Ah battery. Charging will be accomplished on the Shuttle or Station using the new LIB charger or the existing ALPS (Air Lock Power Supply) charger. The LIB delivers a maximum of 3.8 A on the average, for seven continuous hours, at voltages ranging from 20.5 V to 16.0 V and it should be capable of supporting transient pulses during start up and once every hour to support PLSS fan and pump operation. Figure 1 shows the placement of the battery in the backpack area of the EMU suit. The battery and cells will undergo testing under different conditions to understand its performance and safety characteristics.

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