Why is the electric vehicle industry not implementing standardized batteries?

1. The electric vehicle industry is not mature. Different countries and different enterprises have not reached consensus on the material selection, configuration design and connection methods of batteries. It can be said that the battery design of electric vehicles represents a different understanding of electric vehicles by manufacturers. The figure below shows the battery system parameters of three typical electric vehicles.
Nissan LEAF and GM Volt use a stacked lithium-ion battery with a large capacity. The stacked lithium ion battery is shown below.

The Tesla Roadster uses a 18650 battery (Model S is also), as shown below.

Car manufacturers choose batteries based on a variety of factors, including product positioning, battery technology mastery. For example, why did Tesla choose the 18650 battery? There are many reasons. One of them is that Tesla's technology accumulation in the field of single cells is far from enough to support its development of other types of batteries. It can only choose to purchase the current technical maturity ** and consistency of Panasonic from Panasonic. Type battery. Of course, this is Panasonic's specially customized power battery for Tesla, which far exceeds the performance of ordinary laptop batteries. What makes Tesla unique is the development of a very efficient battery management system that manages thousands of cells. In contrast, Nissan has battery technology inherited from NEC. From material analysis to single cell design to module management, Nissan has a large capacity of stacked lithium-ion batteries (thus single The number can be reduced, the complexity of the battery management system is reduced, and the requirements for electric vehicles can also be met.
2. The electric vehicle industry is not without standards. In fact, China has played a pioneering role in the development of electric vehicle standards, and has developed many standards for power battery size and capacity. See the table below.
(From: Professor Zhang Jianbo, Tsinghua University)
However, battery technology is far from mature, and automakers and battery factories are experimenting with different designs. At this time, there are so many standards (although many are recommended standards, not mandatory), which is not significant.
3. The question mentioned in the question “Does this solve the problem of battery charging and mileage without breaking the battery technology at this stage?”, I still don’t quite understand whether you are referring to whether to change the power (that is, when the battery is dead). Replace the battery instead of charging)?
If you are referring to a change of electricity, there are actually many people trying to do this, such as Better Place. But there are also many problems with the power-changing mode, and Better Place has gone bankrupt.