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Membership
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Professional registration recognises your competence, commitment, skills and experience.
The IET provides guidance and support to enable members to undertake planned and structured Initial Professional Development (IPD) and Continuing Professional Development (CPD).
Professional development courses designed to help individuals and organisations reach and stay at the leading edge of engineering and technology.
The IET Awards reward and celebrate individual excellence, innovation and ambition (engineering scholarships).
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Search today for your next engineering role on Engineering & Technology Jobs, the job board hosted by the IET.
Standards
Code of Practice for Electrical Safety Management
Managing electrical safety effectively is vital in avoiding accidents, delays and unseen costs to your business. IET Standards' newest publication will help non-technical managers manage electrical safety in their organisations. The Code of Practice is now available to pre-order.
Publications
Open access
Open access publishing now available in all existing IET research and letters journals, plus our new fully open access online journal, The Journal of Engineering. Now accepting submissions.
E&T webinars
Free-to-attend, interactive webinars that enable you to stay abreast of the latest technology developments, whilst improving your knowledge across a host of engineering-related disciplines.
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Get Involved
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MyCommunity
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MyCommunity, the IET's professional network and collaboration platform, enabling you to connect, interact and exchange knowledge with your peers.
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Volunteering can enhance your career development, is a personally rewarding experience and also benefits your Community.
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Events
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Highlighted events
14 June 2013 | IET London: Savoy Place
Call for papers deadline: 28 June 2013
19 September 2013 | Strand Palace Hotel, London, UK
Call for papers deadline: 18 October 2013
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Policy & Media
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Media centre
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Catch up on the latest IET and engineering developments with our regular IET News video.
Share what’s on your mind through this series of interactive webcasts for members of the IET.
Policy
Key topics offer summaries of the IET’s positions on many of the most important policy topics.
The IET represents the views of its members on a wide range of professional and technological issues.
The IET serves the specialist requirements of the legal profession by nominating expert witnesses to present technical information in court.
Strengthening the debate between engineers, policy-makers and wider society on technology solutions for 21st Century global issues.
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Topic Title: 787 Dreamliner Batteries Topic Summary: Seeking references describing lithium ion cells, batteries, and cell balancing circuits Created On: 31 January 2013 05:54 PM Status: Post and Reply |
Linear : Threading : Single : Branch |
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 31 January 2013 05:54 PM
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Neither Boeing, nor their battery supplier Yuasa, understand the proper care and feeding of a series connection of eight lithium ion cells. If either of them understood the problem, then this very expensive situation would not exist. It is time for engineers, not in the loop, to kibitz. Can any one give me good reference sources for the volt-ampere charge and discharge curves, with temperature as a parameter, for this chemistry?
Does anyone, independent of direct involvement, know if the system instruments individual cell voltages, or corrects cell-to-cell imbalances, in any way? |
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05 February 2013 12:25 PM
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I believe that the manufacturers of batteries for electric cars have developed electronics to monitor and manage the stack of cells to optimise the recharging process for each individual cell in the stack such that charging of each cell ceases once it is optimally charged.
------------------------- electron_thunder |
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IET
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787 Dreamliner Batteries
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