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xkcd #2948: Electric vs Gas
(xkcd.com)
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Motherboard standardization is not even close to comparable.
You have to standardize the dimensions and unlatching mechanism of a huge battery out from under the car and latching a new one in. It has to support a battery that weighs around 2 tons. This isn't just a matter of scaling up a AA battery connector. And then you have to convince all, or at least most, of the manufacturers to do that in order for network effects to help the process. Since we've had to do a lot before manufactures settled on a plug design, we're not likely to do the same for batteries.
Yes, that is how standardization works.
Unless it's regulated for them to do so. Time for the EU to step up.