A few years ago, my company bought smart Lithium batteries for a man-worn electronics pack. These batteries were about 6" wide by 8" tall by 2" thick. These batteries we so smart that they had a built-in microprocessor in each battery. We found that the microprocessor radiated from the internal battery leads. Further, the battery had to withstand 50 V/M. The batteries failed spectacularly, showing strong polarization effects caused by pickup of sensor leads buried in the battery packs which transferred RF right into the microprocessors. For a while, it was like testing fuses, as I destroyed 16 out of the first 17 test samples.
So yes, I'll agree that the smart batteries can be a problem for both radiated emission and immunity. Ed Price ed.pr...@cubic.com WB6WSN NARTE Certified EMC Engineer Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 Military & Avionics EMC Is Our Specialty > -----Original Message----- > From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf > Of Leber, Jody (San Diego) > Sent: Wednesday, August 05, 2009 9:25 AM > To: rehel...@mmm.com; EMC-PSTC@LISTSERV.IEEE.ORG > Subject: RE: [PSES] Li-ion Question > > Bob, > > The CE marking would likely be based on the EMC directive > since the circuitry may be sensitive to ESD. The battery > normally will be under the voltage limits of the LVD. It is > not uncommon in the industry to test the packs and cells to > EN 62133 in addition to ESD and RF Immunity. > If the battery is to be used in a medical application the end > product vendor will probably request even more EMC/EMI tests. > > Currently for an end product to receive a CB Scheme > Certificate any batteries used must be tested to IEC 62133. > > In my opinion, the cells alone should not be marked but > batteries (cells with circuitry typically in an enclosure) > usually will be, especially if they are serviceable by the operator. > > Best Regards, > > Jody Leber > > SGS Consumer Testing Services > > Manager, Battery Test Certification Program > > > SGS - U. S. Testing Company, Inc. > > 16870 West Bernardo Drive, Suite 250 > San Diego, CA 92127 USA > > Phone: 678.469.9835 > Fax: 858.592.7107 > E-mail: jody.le...@sgs.com > > > > > -----Original Message----- > From: Robert Heller [mailto:rehel...@mmm.com] > Sent: Wednesday, August 05, 2009 11:25 AM > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: [PSES] Li-ion Question > > An off-the-wall question. It is my understanding that all > Lithium Ion batteries (or other smart batteries) have digital > circuitry in the for monitoring over-temp, etc during the > recharging process. Do these batteries need to carry a CE > marking because of this circuitry? > > Bob Heller > St. Paul, MN 55107-1208 > Tel: 651- 778-6336 > > - - 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 <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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 <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
