The cells that I have worked with have had a certain amount of internal "intelligence" (a microprocessor with cell monitors and often, status indicators, self-test controls and a communications interface, possibly even internal fusing), but the charger was not part of the cell package. For our man-pack devices, there was a desk-top charging station. For our vehicle devices (including aircraft), the battery, switching power supply (which was the source of battery charging when vehicle power was available) and other functional devices were all mounted into a single sturdy box. In the vehicle configuration, nothing ever could get intimately close to any of the active boxes, and the external case allowed for a layer of shielding and filtering. We also used shielding in the man-packs, but maybe we were just lucky to never have a battery "run-away" failure. We did have man-pack battery failures, but they were all of the "dead battery" kind. (The battery controllers themselves sometimes proved very vulnerable, lacking radiated immunity, but they always failed by disabling the battery; no dying controller ever forced the cells into a conflagration.)
Ed Price WB6WSN Chula Vista, CA USA -----Original Message----- From: John Woodgate [mailto:[email protected]] Sent: Saturday, March 09, 2013 3:14 PM To: [email protected] Subject: Re: [PSES] Immunity and emissions below 150 kHz and lithium batteries In message <cd60f96a.3e1a4%[email protected]>, dated Sat, 9 Mar 2013, Ken Javor <[email protected]> writes: >In my experience the charger is built into the battery as a stand-alone >unit. Perhaps that isn't the wisest arrangement. Didn't someone post that the battery and charger are made by different people? -- OOO - Own Opinions Only. See www.jmwa.demon.co.uk SHOCK HORROR! Dinosaur-like DNA found in chicken and turkey meals John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
