I've been waiting for this announcement for a while now. I can remember talking with one of BMW's top program managers from Munich three years ago. We were discussing my home solar system, and how I'd been powering my MINI-E and ActiveE electric cars with clean, renewable energy from the system for many years at that point. He then asked me the question, "What do you think will happen to your EV's battery once it has reached its end of life?" I answered that I would imagine it would probably be taken apart and recycled, with the lithium being used for new batteries. To which he said, "What if I told you when you need a new battery for your car, you'll be able to keep your old pack and put it in your house. You'll then have the ability to store your unused solar energy, and use it to charge your car at night when you get home. That will assure you're driving a true zero emission vehicle all the time." At that point I remember just smiling and he told me: "When you get your i3, I promise you you'll be able to do just that."
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| BMW displayed a smaller, more stylish energy storage system at CES in Las Vegas earlier this year. It appears as if each layer of this system could hold one module from the i3's battery pack. |
That was three or four years ago, so obviously I'm not quoting him verbatim, but that's pretty much exactly how the conversation went. So this program has been in the works for many years now, and hopefully will be launched soon. The press release doesn't specify when the system will be available, or have any hint of pricing. The one thing I really like about this program is that BMW will allow the customer to keep their old battery pack for use in the system when they upgrade their car to a new pack. No other automaker has provided their customers a path for a 2nd life use of their own battery pack. You already paid for it, why not get another 10 years or so of use from it? Plus, it will be a great comeback when people ask sarcastically (and they do ask this), "Where do you think those toxic batteries from your electric car will end up when you need to replace them?" I can now say, "I'll hang them on the wall in my home for home energy storage," and walk away smiling.
“With a battery storage system electrified by BMW i, our customers can take the next step towards a sustainable energy lifestyle. Coupled with the home charging and solar energy programs, the system enables BMW drivers to embrace holistic sustainability beyond e-mobility,” Rob Healey, Manager of EV Infrastructure for BMW North America.
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| My i3 in front of my home with an 8.775 kW solar array on the roof. I've been powering my electric cars (MINI-E, ActiveE and now i3) with clean, renewable energy since 2010 and would love a system like this to store my excess generation for later use. Having the ability to use my old i3 battery when it's time to replace it would make it even better. |
Although it wasn't mentioned in the press release, I suspect these complete battery packs are stackable. This will allow commercial applications to stack a tower of perhaps ten of them, and store 100 to 150 kWh of energy in a 4' by 6' space. If they were using new 94Ah cells in the pack, it would store over 300 kWh in the same footprint.
This is clearly where the industry is going. Tesla was the first automaker to offer for sale a home energy storage system, and since then other OEMs have announced that they too are exploring this market.
For the complete BMW press release on the subject, follow this link.
battery
battery module
battery retrofit
battery upgrade
BMW i
BMW i3
energy storage
EVS29
home energy storage
Rob Healey
solar electric
sustainability
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- Wednesday, June 22, 2016
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