Battery Pack System for General Motor's Partnership for a New Generation Vehicle (PNGV)-Precept Vehicle

摘要

The performance and cost of a battery pack system remains a significant obstacle to the successful commercialization of hybrid electric vehicles (HEVs). General Motors has developed two of the world's most advanced HEV battery systems for testing in the GM Precept. The Precept is GM's technology demonstration concept vehicle developed to address GM's commitment to the Partnership for a New Generation Vehicle (PNGV). For the Precept to achieve its goal of demonstrating an HEV that achieves up to 80-mpg fuel efficiency for the PNGV program, we needed a unique battery system solution that could meet specific and demanding HEV requirements. Key requirements are the ability of the battery system to provide high specific peak-power over a wide range of battery state-of-charges and to absorb energy from regenerative braking. Additional requirements include design flexibility, small size, low mass, high power, adaptability to extreme environmental conditions, high efficiency, high recharge capability, durability, high cycle life, safety, and affordability/cost effective. In addition to the performance of the battery modules, the design of the battery thermal system and the battery management system are important. The battery modules must be isolated from the heat generated by the HEV engine traction system and a thermal system must be capable of maintaining required thermal conditions during all modes of operation including high power discharges/charges. The battery management system must be capable of calculating an accurate SOC and monitoring appropriate battery module parameters for maximum performance of a battery of small capacity This paper describes the architecture, structure and characteristics of two unique high-power battery systems that were designed specically for the GM Precept.