The protection circuitry of one battery failed at below 200 V/m and the rf conducted immunity equivalent. Filtering solved the problem. Ken Javor Phone: (256) 650-5261
From: sudhakar wasnik <[email protected]> Reply-To: sudhakar wasnik <[email protected]> Date: Sat, 9 Jun 2012 11:02:01 -0700 (PDT) To: "ce-test, qualified testing bv - Gert Gremmen" <[email protected]>, "[email protected]" <[email protected]> Subject: Re: Lithium Batteries and EMC Has any conducted this RF immunity and magnetic field immunity test and found these Over voltage cutoff FET gets activated during or after test> In my experience , Nothing happens. You can test with 100Volts per meter or even higher.... Similar question came up for flash memory and I can say based on the first hand experience , even 1000 volts per meter or equivalent magnetic fields does not cause hard failures like changing the o to 1 or vice versa. Regards, Sudhakar , Apple Inc. From: "ce-test, qualified testing bv - Gert Gremmen" <[email protected]> To: [email protected] Sent: Friday, June 8, 2012 1:41 PM Subject: RE: Lithium Batteries and EMC Re: Lithium Batteries and EMC As Ken says: Lithium batteries contain safety critical electronics that prevent explosion when overcharged, and limit discharge to a safe value ?..! A popular cell type is charged to 90% at 3.1 V, 100% at 3.15 V and explodes or at least burns fiercely when charged to 3.2 V It is of utmost importance that these charge cut-offs function decently , also in the presence of strong fields. This may justify the ce mark and probably some EMC testing. Numbers vary per technology, so do not try this at home. Gert Gremmen Ce-test, qualified testing Van: [email protected] [mailto:[email protected]] Namens Ken Javor Verzonden: vrijdag 8 juni 2012 20:29 Aan: [email protected] Onderwerp: Re: Lithium Batteries and EMC Some lithium-ion batteries incorporate active protection circuitry to prevent over-charging and excessive current drain. Ken Javor Phone: (256) 650-5261 From: <[email protected] <mailto:[email protected]> > Date: Fri, 8 Jun 2012 11:00:19 -0500 To: <[email protected] <mailto:[email protected]> > Subject: Lithium Batteries and EMC I noticed a lithium battery with a CE marking on it. Is EMC part of that CE Mark? Are there any EMC standards/requirements for smart batteries? Thanks, Bob Heller St. Paul, MN 55107-1208 Tel: 651-778-6336 Fax: 651-778-6252 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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