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  1. R

    FS: Headways 38120 4S2P pack

    Any interest in a 4S2P Headway pack? Been siting in my lab for a few years now doing nothing. So hopefully will be useful for somebody else. Can be easily rearranged to a different configuration. Make offers! Spec: Checked voltages and all are 3.3V. Don't have time to cycle them to see what...
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    Sinclair C5 teardown on EEVBLOG ;)

    Dave Jones over on EEVBLOG just did a test drive/teardown video on Sinclair C5- a funky bike with assist from the mid eighties. http://www.youtube.com/watch?v=xS6q27VOTOk
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    Basic feature set for a BMS

    Hello all, I am looking into making a low cost basic BMS for myself, and figured I'd ask what others would be interested in seeing, as at this time it's easy to throw in some features Right now thinking of: per cell UV/OV detection per cell passive balancing on charge Open drain /opto or...
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    TI design contest entry- a BMS system

    http://circuitcellar.com/designstellaris2010/winners/TI2835.html This guy took LTC6802+Luminary Micro+LCD+contactors. Full design documents listed as well- pretty cool :) "Design flaws in some current lithium-ion systems can be overcome with some additional hardware and the right microprocessor...
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    Should I make a Seiko-based BMS?

    As some of you know, I've been testing my S-8209 based BMS for quite a while now in my mower and so far it's been doing well, running its 24V DC motor. (See http://endless-sphere.com/forums/viewtopic.php?f=14&t=18803&p=274105&hilit=seiko#p274107 for details) So now I am thinking of spinning it...
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    Honda Civic Hybrid II battery pack communications

    Has anybody succeeded yet in interfacing to a battery pack from a Honda Civic Hybrid II? There is a lot of recent issues with packs loosing capacity in HCHII, to the point of Honda issuing a "product update" to reduce effective depth of discharge in certain use cases to prolong their life. Being...
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    My Seiko based BMS

    I finally got around to throw it together- basically an 8 channel Seiko S-8209 based BMS with OV/UV and balancing. The chips are working pretty well, and are very easy to string together. Getting them in the first place is a different story. I used a separate charge input, with an NMOS FET, and...
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    New chip- TI bq76PL536

    http://focus.ti.com/lit/ds/symlink/bq76pl536.pdf Seems to be an interesting part, similar to LTC6802 but with onboard storable limits, allowing it to run safety things standalone. Listed as preview, with very little information. I am working through my channels to see if I can find out more, but...
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    And yet another new chipset- Atmel

    Atmel has just announced two new parts for large LIthiumIon stacks: http://atmel.com/dyn/resources/prod_documents/article_Li-Ion_s.pdf http://atmel.com/dyn/resources/prod_documents/doc9019.pdf Press release below: Atmel Launches Industry's Safest Battery Management Solution for Automotive and...
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    $2.4 Billion in grants awarded to battery and EV companies!

    http://www1.eere.energy.gov/recovery/pdfs/battery_awardee_list.pdf $2.4 Billion in Grants to Accelerate the Manufacturing and Deployment of the Next Generation of U.S. Batteries and Electric Vehicles Recovery Act will fund 48 new advanced battery and electric drive components manufacturing and...
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    NEC 24V LiMN pack

    Stumbled on this page from NEC-Tokina. http://www.nec-tokin.com/english/product/pdf_dl/24vbatterypack_e.pdf 24V Lithium Manganese Pack
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    Headway cell frames-now with pictures!

    We just received our order of cells (direct from Victoria) at work, and she was nice enough to sell us the battery frames/assembly blocks like the ones she was showing on a picture in Headway group purchase thread. They look like the PSI ones, but dual- each one hold two cells and interlocks...
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    Any experiences with TS-LFP20AHA ?

    I've been contemplating getting some cells from elitepower, but I see now that their 20AH cells are no longer individually packaged, but are grouped in fours to better approximate 12V packs. Question is- how does one balance/monitor individual cells if all you get is a big + and - out of the...
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    Dewalt BMS- what are they using for communication?

    I have a DC9280 pack in front of me and am trying to find any communication channels among the pins on the connector. According to http://www.neodymics.com/Images/V24ProtoSwitch070818E.pdf pins 3,4 and 8 are no connect, so I suspected they could be SMB or DQ (standard smart battery interfaces)...
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    Single cell LiFePO4 charger

    Once again, while looking for something else, I stumbled across a TI appnote on how to charge a single LiFePO4 cell using their lithium Ion charger: http://focus.ti.com/lit/an/slua443/slua443.pdf Not much new there, but a good reference if one wants to make a charger. Note-this is not isolated...
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    New High Rate LiMn cell from Panasonic

    Noticed this press release today: "Using a nickel manganese-based cathode material, Panasonic’s CGR26650A lithium-ion cell exhibits a discharge rate capability of up to 40 A. The component exhibits a typical capacity of 2,650 mAH with a recharge rate to have most capacity recovered within...
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    New TI BMS chipset?

    Hello from a long time lurker. Has anyone tried the new cell monitoring chipset (BQ78PL114 / 76PL102) from TI? It seems a bit part count heavy and is using impedance track for gas gauging, which may or may not handle LiFePo4 chemistry, but their balancing looks interesting. Almost like there...
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