Appreciate the responses...
...The comparison to software standards isn't directly on point, inasmuch as these software platforms don't require the third-party apps to provide core functionality. If no one had written an app for the iPhone, the phone would still work just fine.
Fair point. Let's stick to HW. How about the IBM PC architecture then? The specifications for the PC allowed different components to be built by different manufacturers in a competitive market. The PSU is as vital in a PC as the battery is in the Model S, but, by opening up parts of the architecture, competitive market forces could bring down prices and raise performance. Compare the lively advances in the early PC hardware days to the progress Apple made pre-97. Many hardware manufacturers grew to billion dollar businesses on the backs of that competitive free-for-all (Dell, Gateway...) and the consumer benefited tremendously.
Of course Tesla would not want to repeat the mistakes of IBM there (don't open it all up, or hand the SW over to a startup)! But instead of opening up the entire architecture they could expose just that part that would benefit from competitive market innovation forces. After all, Panasonic is the one making the cells, not Tesla. Why should they not publish the battery cell specs and allow them to be replaced inside the Tesla propriety battery pack?
...The car battery is a source of comparative advantage: the performance characteristics of the battery define the performance characteristics of the car (as we can see from the different specs for the different Model S batteries).
The capacity and power delivery of the battery pack will be a combination of the number of cells, the compounds of each cell, and perhaps also the battery pack internal circuitry and cooling system. Allowing the cells to be substituted for 3rd party cells would not affect the IP that Tesla own in the Battery pack.
I have Radio controlled buggies that can run on NiMH or LiPo battery packs (with varying cell numbers) each of which delivers different range and performance, but the car manufacturer doesn't even sell the battery pack. The open market for such packs has brought excellent advances in performance even though this is a tiny niche market for battery manufacturers.
(And *there* is a place where Electric has beaten ICE!)
Furthermore, car manufacturers will need different form factors for their different cars.
Agreed. This is perhaps why the idea of having the cells inside the battery pack exchangeable is the best idea of a way to build an open competitive marketplace.
Also, car batteries must be much more durable, and undergo much more rigorous testing, than almost any other consumer end-use product.
True, but car tyres are very important to car handling, braking and responsiveness. I think we'd all agree that the open market there has produced many advances and good price control. Brake pads too. Manufacturers do try to keep us buying the genuine original parts, but the open market for replaceable components is a reality and has benefited us all.
The best comparison that I can think of is to jet engines. Boeing, Airbus, and the few other OEMs do not make their own engines....
Its a good comparison, but scale is everything. Given the scale of Tesla's Model S output (20k/year) and the novelty of the technology, I have to agree that it is similar to the aircraft business, just as the early days of ICs was a specialist arena for military and high-value applications.
However I feel this thread is considering the need to obtain exponential advances in order to reach mass-market scale and volume just like Gordon Moore's Intel did when it broke out towards larger and larger scale.
Therefore I would argue that while we could applaud a closed protected battery pack in order for Tesla to succeed at small scale with the Model S and X against specific competitors, we should consider encouraging the opening of some specification (perhaps the individual battery cell specification) in order to ferment some competitive innovation in this space.
And all this from a European liberal!