Battery facts?

[Laumb]

What do we know about the batteries?
- there's a 60kwh option
- there's a 85kwh option.
- they where supposed to introduce a proper 40kwh version, but they didn't. Lucky bas'ards got themselves a 60kwh. ;-)
- it uses 18650 cells.
- Its a flat pack with coolant - but the package itself is the same on both versions.


Could we try and collect what we know In this thread? I'm on a mission with this - but until I got some more info, Im unsure of the results of my Mission.

What are the cells rated volt and kWh?
What is the curb weight of a 85kwh Model S?
What is the curb weight of a 60kwh Model S?
What is the curb weight of a performance S?
What is the chemistry used (what do we know about the mix?)?

Feel free to add any other information that will be useful. Thanks!

 

[qwk]

3.6v 3.1ah

http://industrial.panasonic.com/www-data/pdf2/ACA4000/ACA4000CE254.pdf

7104 cells for the 85kwh pack.

 

[stopcrazypp]

3.6v 3.1ah

http://industrial.panasonic.com/www-data/pdf2/ACA4000/ACA4000CE254.pdf

7104 cells for the 85kwh pack.

Isn't the 7104 just an estimation by doug? And it does not match with the 3.1Ah that Tesla announced.
http://www.engadget.com/2010/04/23/panasonics-3-1ah-batteries-to-be-used-in-the-tesla-model-s-hav/
http://www.teslamotorsclub.com/showthread.php/6421-Horsepower/page7?p=85455&viewfull=1#post85455

7104*3.6V*3.1Ah = 79.3kWh, which is off by 5kWh.

It would match 3.4Ah closer:
7104*3.6V*3.4Ah =86.9kWh

But I do agree with Doug's calculation method. There are 16 modules in the Tesla pack and from a Tesla diagnostics screen I have seen there are 6 cell groups per module in series (means overall 96 cells in series since the modules are wired in series). That means the battery cell number pack must be a factor of 96 (16*6=96), but it's going to be tough to guess the exact number.

You can also work out:
Nominal voltage of pack - 3.6V*96= 345.6V
Charging voltage of pack - 4.2V*96= 403.2V

 

[Banahogg]

Dual Mode Range Extended Electric Vehicle - Patent application has a description of a hypothetical battery pack that sounds awfully close to these specs. Ripped from reality?

Some examples connect 69 cells in parallel to define a brick. Battery voltage, and as such, brick voltage, often ranges from around 3.6 volts to about 4.2 volts in use. In part because the voltage of batteries ranges from cell to cell, some instances include voltage management systems to maintain a steady voltage. Some embodiments connect 9 bricks in series to define a sheet. Such a sheet has around 35 volts. Some instances connect 11 sheets in series to define the battery of the ESS. The ESS will demonstrate around 385 volts in various examples. As such, some examples include approximately 6,831 cells which are interconnected.

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[qwk]

Isn't the 7104 just an estimation by doug? And it does not match with the 3.1Ah that Tesla announced.
http://www.engadget.com/2010/04/23/panasonics-3-1ah-batteries-to-be-used-in-the-tesla-model-s-hav/
http://www.teslamotorsclub.com/showthread.php/6421-Horsepower/page7?p=85455&viewfull=1#post85455

7104*3.6V*3.1Ah = 79.3kWh, which is off by 5kWh.

It would match 3.4Ah closer:
7104*3.6V*3.4Ah =86.9kWh

But I do agree with Doug's calculation method. There are 16 modules in the Tesla pack and from a Tesla diagnostics screen I have seen there are 6 cell groups per module in series (means overall 96 cells in series since the modules are wired in series). That means the battery cell number pack must be a factor of 96 (16*6=96), but it's going to be tough to guess the exact number.

You can also work out:
Nominal voltage of pack - 3.6V*96= 345.6V
Charging voltage of pack - 4.2V*96= 403.2V

The number of cells has come from several sources, including Tesla service.

In the national geographic video, it looks like there are 14 modules. There is a screenshot pic floating around here.

 

[richkae]

Dual Mode Range Extended Electric Vehicle - Patent application has a description of a hypothetical battery pack that sounds awfully close to these specs. Ripped from reality?


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This is the Roadster battery.

 

[stopcrazypp]

The number of cells has come from several sources, including Tesla service.

Okay I was able to dig up the source for 7104, FrankZ said a service manager said it was 7104:
http://www.teslamotorsclub.com/show...ing-To-Battery?p=311371&viewfull=1#post311371
If that service manager knew what he was talking about that would imply 3400mAh cells.

In the national geographic video, it looks like there are 14 modules. There is a screenshot pic floating around here.

There are 14 modules in the flat section, but there's two additional modules stacked on top of each other in the front to the car (it's the box stamped with TESLA in between the two front wheels in the second picture).

http://www.teslamotorsclub.com/show...mpressions/page5?p=50703&viewfull=1#post50703

 

[Jack_L]

Couple more battery questions for those who know....

I'm looking at the MS (currently a deposit on the MX) and would want to have a few lights hooked up to the 12V battery. They would be low draw LED lights that would run infrequently and have an on/off switch so I could shut them off. The local service center said they could install them but nobody seems to be sure if the main battery pack will recharge the 12V if it were to get low. Would this work for me? I would not run them if I were getting low on range but for times where I had excess range would this cause a problem? Thanks!

 

[Hank42]

Couple more battery questions for those who know....

I'm looking at the MS (currently a deposit on the MX) and would want to have a few lights hooked up to the 12V battery. They would be low draw LED lights that would run infrequently and have an on/off switch so I could shut them off. The local service center said they could install them but nobody seems to be sure if the main battery pack will recharge the 12V if it were to get low. Would this work for me? I would not run them if I were getting low on range but for times where I had excess range would this cause a problem? Thanks!

Unless you're going to draw a few thousand watts, this should not be a problem at all.