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１ 前言全世界对环境保护越来越重视，对燃油机动车辆的排气污染物的排放限值要求也就越来越严，从而促进了电动车辆的研究和发展。电动车辆是技术密集型的产品，涉及面很广，技术发展变化也很快，特别是在蓄电池、功率电子器件和驱动系统方面。因此，要不断制定和修订保证人
1 Preface The world is paying more and more attention to environmental protection. The requirements on emission limits of exhaust pollutants from fuel motor vehicles are also getting more and more stringent, thus promoting the research and development of electric vehicles. Electric vehicles are technology-intensive products that cover a wide range of technologies and rapidly evolve rapidly, especially in batteries, power electronics and drive systems. Therefore, we must constantly develop and amend the guarantor