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surfingslovak
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Re: Battery Pack Mass Properties

Wed Jul 24, 2013 1:08 pm

RegGuheert wrote:
surfingslovak wrote:^^^ Once again, do we have any confirmation that this is in fact the case?
Yes.
Would you care to elaborate?

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RegGuheert
Posts: 6419
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Delivery Date: 16 Mar 2012
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Re: Battery Pack Mass Properties

Wed Jul 24, 2013 2:34 pm

surfingslovak wrote:Would you care to elaborate?
Sure. Here is what I wrote in January about the 2013 battery changes:
RegGuheert wrote:Some notes on the 2013 battery:

- The module case was modifiied to reduce weight and materials used. They claimed a 30 kg weight reduction for the LEAF battery just from that change.
- The changes to the 2013 battery module chemistry were mainly intended to reduce cost. (There has been some mention of improvements in thermal capabilities, but the battery experts did not confirm that. They indicated there may be small changes in battery characteristics, but weight and cost were the two major changes.)
- The 2013 battery modules are compatible with the 2011/2012 LEAFs.
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

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surfingslovak
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Re: Battery Pack Mass Properties

Thu Jul 25, 2013 12:05 am

RegGuheert wrote:
surfingslovak wrote:Would you care to elaborate?
Sure. Here is what I wrote in January about the 2013 battery changes:
RegGuheert wrote:Some notes on the 2013 battery:

- The module case was modifiied to reduce weight and materials used. They claimed a 30 kg weight reduction for the LEAF battery just from that change.
- The changes to the 2013 battery module chemistry were mainly intended to reduce cost. (There has been some mention of improvements in thermal capabilities, but the battery experts did not confirm that. They indicated there may be small changes in battery characteristics, but weight and cost were the two major changes.)
- The 2013 battery modules are compatible with the 2011/2012 LEAFs.
This is great, thanks! Certainly better than the opaque references quoted in the press. It's good to hear that they would tweak the chemistry if it's deemed necessary. LG Chem and GM appear to be a bit more aggressive on that front, there was even a rumor of another slight capacity increase for the 2014 MY, but it turned out to be unsubstantiated. Still good to hear, I suggest that your post was quoted when the question about battery changes comes up again.

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RegGuheert
Posts: 6419
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
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Re: Battery Pack Mass Properties

Thu Jul 25, 2013 3:51 am

surfingslovak wrote:It's good to hear that they would tweak the chemistry if it's deemed necessary. LG Chem and GM appear to be a bit more aggressive on that front, there was even a rumor of another slight capacity increase for the 2014 MY, but it turned out to be unsubstantiated.
I agree that LG Chem and GM have been a bit more aggressive on this front. My (pure) speculation is that my last bullet is a key reason why Nissan would not substantially change the chemistry for 2013: Perhaps they want to have local supply for modules coming from the US and Europe that they could use for repairs of the 2011/2012 LEAFs. Of course it needs to be physically compatible, but they likely don't want the chemistry to be too different, either, otherwise it may not play well with the heuristics in the BMS. Again, that is just a guess.
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

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