[ausev] LiFePO4 battery system suitable for DIY EV's

[Marc Kohler]

Hi Kevin,

I think it's a very interesting idea, one that many would like to see
happen.

Whose LiFePO4 modules are you planning on using as the basis of the pack?

Have they provided any test data to verify claims?

Best regards,

Marc Kohler

 

From: ausev-bounces at austinev.org [mailto:ausev-bounces at austinev.org] On
Behalf Of Kevin Douglass
Sent: Wednesday, December 10, 2008 10:05 PM
To: AusEV at austinev.org
Subject: [ausev] LiFePO4 battery system suitable for DIY EV's

 

Hello to all,

My name is Kevin Douglass.

I'm a member of HEAA (Houston Electric Auto Association).

We have a couple of EE's with experience in this sort of thing in the club
who are starting on a project to make a LiFePO4 battery system suitable for
EV's.  Tentatively these modules are expected to be about 4.5KWhr, 75VDC,
300Amps max continuous, 600Amps peak, with 22.5Kwatts (29 hp) continuous
power. Modules can be series or parallel connected just like commercial
batteries.  DC motor EV's would probably take two modules in series for
150VDC, 9KWhr capacity (@ 250W/mi ? 36 miles).  A higher voltage AC system
could use three or four in series.  A more powerful DC system, or if you
want twice the range, could use four (150VDC, 18KWhr.) in series/parallel.
Each module will be fully enclosed and protected; yet individual cells can
be easily replaced.  Full BMS will be built-in, with remote SOC/SOH display.
The system may also have a built-in battery charger and possibly a DC-DC
converter (for 12V battery) depending on what everyone agrees on.

This is a big project expected to take most of 2009.  The predicted price of
the modules is currently $6,000 but subject to change as things are further
defined.  Our desire is to be less expensive than other LiFePO4 systems
available to DIY EV builders, but of high commercial quality with safety as
first priority.  To participate in the project, a contract, NDA, and earnest
money will be required.  There will be a schedule for payments throughout
the year as major milestones are accomplished.

Is there interest in this from members of the Austin EV list in particular
but not limited to those that are close to the Houston area.  The cells are
being bought in quantity and building more modules lowers the cost of cells
and the proportional costs of getting the electronics made.

Please contact me at 713-927-6997 or   <mailto:k.douglass at earthlink.net>
k.douglass at earthlink.net

Thank you,

Kevin Douglass

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