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I've been reading the datasheets for the BQ20Z95 and its Evaluation Module. There's mention of a 'chemical fuse' but no suggested part number anywhere. I haven't come across this kind of fuse - is there another name for it?
From the FAQ Knowledge Base
These two companies are known to manufacture the 3-terminal chemical fuses:
Sony Chemicals Corporation
Electronic Devices Business Group
1-11-2, Osaki, Shinagawa-ku, Tokyo, 141-0032 Japan
TEL +81-3-5435-3943 FAX+81-3-5435-3072
Uchihashi Estec Co., Ltd.
Headquarters and Overseas Sales Department
9-14, Imazu-Kita 2-chome, Tsurumi-ku, Osaka 538-0041 Japan
TEL (06) 6962-6661 (INT-81-6-6962-6661)
FAX (06) 6962-6669 (INT-81-6-6962-6669)
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In reply to TravisN:
There is something to know about the Sony product: You mustn't use it for medical applications
An Other Company offering such fuses is NEC but I dont know the exact type name
In reply to Jörg:
I tracked down the NEC fuses,
Also, why do you say that the sony fuses cannot be used for medical applications? Do they state that somewhere? Is there another reason other than liability?
In reply to Erik Larson12947:
Sony wants to know the end Application and if it`s a medical there will be no dellivery
I don't know why but we had this @ two customers
They will also refuse to supply fuses for any military projects
Hi I have a large selection of chemical fuses. NOS of about 200 on hand. Let me know and I can send out what you need. I have tons of NOS tubes and transistors as well. Todd 540-641-4536
In reply to Todd Smith:
Is there any alternate solution (logic) for the chemical fuse?
Sony Chemicals has recently become Dexerials, and the devices referenced can be found here:
However, I have contacted them regarding purchasing and samples and haven't heard anything back from them. Which is putting an unfortunate cramp in my development, I would have thought triggerable fuses like this would be easier to get.
As for an alternative, you'd need a way to fire the fuse very quickly without that surge reaching the load. Maybe force the series-pass MOSFETS off, then short the pack across the fuse to blow it? might be able to pull this off with a small device like a 2n7002 to drive the series-pass devices out of conduction and then something with a large peak current capability like a CSD series device to short the pack across the fuse. But that's assuming you can get enough current out of the cells to blow the fuse quickly and reliably.. not a lot of safety in that I think.
In reply to William Anthony:
I am wondering if these Chemical Fuses are a mandatory element of Lithium-ion battery packs. I am working with a Chinese Li-ion packsupplier, and they produced a pack design based on a bq20z45-R1 fuel gauge IC, but there was no Chemical Fuse circuit. Also, therewas no secondary-overvoltage-protection IC such as the bq29412. Are the Chemical Fuse and bq29412 (or similar IC) required for commercialLi-ion battery pack applications? Is there a Regulatory requirement?
BTW, I am working on a medical device design.
Thanks for any advice.
In reply to Mohan Gurunathan:
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