Results of Electric-Vehicle Propulsion System Performance on Three Lead-Acid Battery Systems.

摘要

Three types of nominal 6-V lead-acid batteries, one in current use and the other two proposed as near-term candidates for use by the electric vehicle industry, were tested at the Naval Weapons Support Center, Crane, Indiana, under laboratory conditions. The primary objective of this work was to determine the cycle life of lead-acid batteries as a function of electric vehicle propulsion system design. Included in this objective was a comparison of different battery types (EV106 baseline versus state-of-the-art 3KQ-11 tubular and EV1000 thin plate batteries) as pertaining to cycle life, degradation rate, and respective failure modes. In addition, the secondary test objectives were to study the effects of testing in three versus six series strings in relation to overall performance. The test profiles chosen are defined in the SAE J227a, schedule D specification for a hypothetical vehicle with the following characteristics: weight, 1701 kg (3750 lb); product of aerodynamic drag coefficient and projected frontal area C/sub D/A, 0.84 M exp 2 (9 ft exp 2 ); and tire coefficient, 1.1x10 exp -2 . The electric vehicle battery pack is a 120-V system consisting of twenty 6-V lead-acid modules. The propulsion system was assumed to have 70 percent efficiency during acceleration and 50 percent efficiency during regenerative deceleration. (ERA citation 09:040478)