The next step in the development of pure electric vehicles as a systematic study

Last year, the DOE produced a report "Enabling Fast Charging: A Technology Gap Assessment", which is a systematic study of the next step in the development of pure electric vehicles. This study is divided into several aspects

Purpose background:

Although the cost of pure electric vehicle powertrains has rapidly dropped by more than four times in the past 10 years , and drivability and performance have improved significantly, the US pure electric vehicle market still accounts for only about 1% of new vehicle sales. The total cost of power for pure electric vehicles is not equivalent to that of diesel locomotives; Another obstacle to the promotion of pure electric vehicles is the speed of power supply. Most of the charging of pure electric vehicles is done at home, but from the perspective of consumers, using public DC fast charging can have a significant impact on the utility of pure electric vehicles. Two of the most fundamental solutions to the problem of “mileage anxiety” are that the vehicle has sufficient battery life and that it has the ability to charge fast. The purpose of this study is to evaluate the 400 kW extremely fast charging (XFC).

This research mainly starts with the whole vehicle and infrastructure. It involves many cores. In considering the subdivision of the whole vehicle, the design of the battery system, battery cell design, and battery thermal management is the top priority. s position.

The next article will be based on the above classification, starting from the vehicle, careful consideration of each aspect, especially the battery system.

In fact, according to research results, the US Department of Energy’s Vehicle Technology Office announced that it will fund US$15 million to support R&D projects for power batteries and charging systems for electric vehicles. Based on the results of the assessment, it will develop new lithium that meets the demand for the next generation of electric vehicles. Ion battery technology, regain balance in these few

High Battery Energy Density (Wh/kg)

Longer battery life (cycles) and battery cost compromise

High-power fast charging system

The goal is to shorten the charging time (reducing the charging time to less than 10 minutes). The funding project will focus on the two major technical topics of the fast-charging system and the Lithium-ion Battery for fast charging systems. The research content is:

These studies can also be compared based on existing commercial research projects to truly assess the major differences from existing 400V systems to 800V systems.

Summary: There is a lot of detailed content here. Research, decomposition, and then into the conceptual design and pre-research project demonstration stage, and then carry out corresponding special projects for evaluation, in order to accumulate actual experience and understand the real difficulties.