Sea Technology

JUL 2017

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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Page 22 of 68

22 st / July 2017 The PTBS is designed for untethered applications with long deployment cycles, such as data loggers, sonde devic- es and bottom-pressure recorders like those used on DART II tsunami detection and warning systems. It can operate in temperatures as low as 2° C and features a scalable design from 14 to 42 cells, resulting in energy output flexibility from 360 to 900 Wh. In addition, by using alkaline cells, the new system requires no United Nations transportation test- ing or certification. The design, which initially features alka- line cells, removes the need for expensive housings made of advanced composite materials or titanium alloys. ST Despite the battery theoretically being void of all gas and, therefore, able to tolerate rapid increases in pressure, the rate of pressurization was adjusted to about 250 psi per minute to simulate the pressure delta potential of a free-fall- ing instrument in the ocean. Initial tests on the proof-of-concept model allowed Ener- gy Sales and its collaborators to collect electrical data used to develop the test protocol for subsequent cross-sectional analysis. The battery was discharged at a resistive load of 250 mA across four parallel cell strings. Each cell string was calculat- ed to have a capacity of about 17.5 Ah at room temperature or 70 Ah for the four-string battery pack. The depth test was terminated at 222 hours with a calculated energy removed of 44.14 Ah. After testing, the battery was removed from the test appa- ratus and dried. There was no evidence of any fluid residue prior to or post-draining on the interior of the test chamber, and there was no fluid residue on the exterior of the battery pack. Conclusion These initial test results provided the basis for the design of the new PTBS product line by Energy Sales. Further test- ing to date has been consistent with the initial results pre- sented here. The PTBS offers a new level of cost-effective portable power for deep-ocean applications. Using similar design and methods, Energy Sales is making available a full range of pressure-tolerant batteries for depths between 1,800 and 3,000 m. Vincent Lefebvre is the director of engineering at Energy Sales Inc. He joined Energy Sales as director of engineering in 2016. He brings extensive experi- ence in product design and development from the telecommunications and networking industries. He collaborates with customers to find, design and de- velop the best and most cost-effective battery solu- tions for their applications. Lefebvre's prior positions include IoT architect at GadgEon Systems, director of engineering at Motorola and director of software development at Symbol Technologies. Terry Conrad is the president of Sealand Innovations LLC. He has 30 years of research, product design and technology management experience and has developed electronic and acoustic devices for agen- cies of the U.S. government and its contractors and for consumer brands. Some of Conrad's prior posi- tions include president of Conquest Innovations LLC and director of technology transfer and president of American Technology Corp. (now LRAD). He can be reached at Save time and money locating subsea cables - Locates and tracks cables - Finds faults and breaks - Use on land & underwater - Audio and Visual output - Commercial construction - Calculate burial depth with a JW Fishers CT-1 Cable Tracker. JW Fishers Mfg., Inc. 1953 County Street East Taunton MA 02718 USA (800)822-4744 or (508)822-7330 Email:

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