Sea-water battery for subsea control systems

This paper describes a power source for the autonomous control system of a subsea well (SWACS) in the Ionian Sea. The unit was deployed in Jan. 1996 at a depth of 180 m. The 650 kWh sea-water battery uses anodes made from commercial magnesium alloys, sea-water as the electrolyte and oxygen dissolved...

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Bibliographic Details
Published in:Journal of power sources 1997, Vol.65 (1), p.253-261
Main Authors: Hasvold, Øistein, Henriksen, Henrich, Melv˦r, Einar, Citi, Gianfederico, Johansen, Bent Ø., Kjønigsen, Tom, Galetti, Robin
Format: Article
Language:English
Subjects:
Applications/underwater equipment
Applied sciences
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
Magnesium anode reserve batteries
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Summary:This paper describes a power source for the autonomous control system of a subsea well (SWACS) in the Ionian Sea. The unit was deployed in Jan. 1996 at a depth of 180 m. The 650 kWh sea-water battery uses anodes made from commercial magnesium alloys, sea-water as the electrolyte and oxygen dissolved in the sea-water as oxidant. The inert cathodes are made from carbon fibers. The system is composed of six, two-metre high sea-water cells integrated in a steel structure, a d.c./d.c. converter and a valve regulated lead-acid accumulator enclosed in a titanium container together with a monitoring unit which transfers data to the surface via an acoustic link.
ISSN:0378-7753
1873-2755
DOI:10.1016/S0378-7753(97)02477-4