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spaceballs
Member
There are some sheets of fireproofing material under and on top of each module. No insulation really. From the bottom of the pack up: 1/4" Aluminum, thin fire proofing sheet, plastic module cover, cell module. So, I think it will slip to whatever the external temp is pretty quickly.
Cottonwood
Roadster#433, Model S#S37
Pack housing is gone alreadySold it to a buddy who scraps, for pretty cheap (he came and loaded it and hauled it off) just to get it out of the way
Put your buddy in touch with Tony. Tony will get his keepsake and your buddy will make more money.
Yeah, tried that as soon as I read the post, but he got rid of it already... :-\
I could get the info for wherever he took it in case its in one piece still if you want, Tony...
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Note: I was able to decode the tiny little data matrix on the one cell I snapped a shot of: 5221DACP0143000B
I assume its a serial number for the individual cell?
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Tony:
This is the place that it was taken at today: http://www.matteo-iron.com/
He said they probably wont move it until Monday, so, might be worth contacting them if you really want it.
TonyWilliams
Active Member
spaceballs
Member
I did something similar to a Nissan LEaf battery.
It is now running as an storage solution to my on-grid system.
The BMS i use is this one.
REC d.o.o.
IT has CAN support to the SMA Sunny Island 6.0H.
It is now running as an storage solution to my on-grid system.
The BMS i use is this one.
REC d.o.o.
IT has CAN support to the SMA Sunny Island 6.0H.
I think the pack come close to doubling the torsional rigidity of the Model S chassis when installed in the vehicle
So it is not dead weight like most other EV packs. Also remember it has been designed for robotic swapping and to serve as a ballistic shield.
Cottonwood
Roadster#433, Model S#S37
I have an on/off-grid system in Pagosa with SMA Sunny Islands paired with SMA Sunny Boys and conventional Lead Acid energy storage. The Sunny Island product is a well-engineered, reliable product, and works well with the Sunny Boy Solar Inverters to make an "island" off grid system, or a grid-tied system that can "island" itself and continue running when the grid goes away.
If all you want is backup power, a propane generator with an underground propane tank is much cheaper, even if you are doing grid-tied solar.
He has a more pics and details on the MNL forum: My Nissan Leaf Forum View topic - Use of Nissan Leaf battery in Solar installation.
He broke the modules into ~48V units - 7 modules in series (each module is a 2P2S config), 6 in parallel, 42 total) so that it'd work with off-the shelf off-grid hardware. Very nice setup!
spaceballs
Member
JRP3
Hyperactive Member
Of course Jack just has to take a shot at everyone involved in the thread, including the OP doing the work Meanwhile Jack can't count modules properly...(no Jack there are not 8 on each side, try again).
Meanwhile Jack can't count modules properly...(no Jack there are not 8 on each side, try again).Interesting that the TI battery monitoring chip stores the threshold voltages in OTP (one-time programmable) eprom, so there is a default setting for when the balance circuit is turned on. The FETs are driven either ON or OFF, there is no adustable gate drive to cause any sort of variable impedance balancing scheme.
Just testing a bit while I wait around for my inverter...
The module side of the module BMS board's isolation IC's power input pin reads 5V, so that portion of the board is active in some fashion still running off of thr module itself.
Since I'm not sure what, if anything, this is doing in my configuration I'm going to finish disconnecting the remaining boards from my modules...
The module side of the module BMS board's isolation IC's power input pin reads 5V, so that portion of the board is active in some fashion still running off of thr module itself.
Since I'm not sure what, if anything, this is doing in my configuration I'm going to finish disconnecting the remaining boards from my modules...
It looks like each module board talks to his neighbor passing along voltage data and fault status thru a serial bus back to the main BMS board. They are powered from the modules so will draw a small bit. Guess you probably don't have time to mess around with trying to read the serial data...
From the datasheet : The bq76PL536A has six dedicated outputs (CB1…CB6) that can be used to control external N-FETs as part of
a cell balancing system. The implementation of appropriate algorithms is controlled by the system host. The
CB_CTRL[CBAL1–6] bits control the state of each of the outputs. The outputs are copied from the bit state of the
CB_CTRL register, i.e., a 1 in this register activates the external balance FET by placing a high on the
associated pin.
Thus the balancing algorithm is done by the BMS master board (the host the datasheet talks about). The host sends the state it wants for these output through the SPI bus.
Because of the very low balancing current (~100mA with the four 158r in parallel), maybe they implemented a better balancing algorithm than just activate the balancing when the cell reach its maximum voltage.
lolachampcar
Well-Known Member
nlc,
I suspect there is a micro on each module's dedicated BMS board that handles the TI chip. It should be possible for the micro to PWM the outputs but that seems like an awful lot of work for very little gain.
WRT all the BMS boards, there has to be some type of level independent serial bus such that modules referenced at different voltages can all hang out and talk to the main board (422???). The distances and different voltage references rule out a lot of busses.
I suspect there is a micro on each module's dedicated BMS board that handles the TI chip. It should be possible for the micro to PWM the outputs but that seems like an awful lot of work for very little gain.
WRT all the BMS boards, there has to be some type of level independent serial bus such that modules referenced at different voltages can all hang out and talk to the main board (422???). The distances and different voltage references rule out a lot of busses.
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