IMPLEMENTATION OF A BATTERY PROGNOSTICS SYSTEM FOR THE USMC EXPEDITIONARY FIGHTING VEHICLE

摘要

A Battery Prognostics System (BPS) that is capable of accurately assessing the state-of-charge (SOC) and state-of-health (SOH) of lead acid starting-lighting-ignition (SLI) batteries can provide significant operational and logistical benefits when implemented onboard ground combat vehicles. In this paper, the design of a BPS for the USMC Expeditionary Fighting Vehicle (EFV) will be presented. The prognostics hardware utilizes proprietary current sensing circuitry to measure the wide-band impedance of the vehicle batteries in situ. Impedance spectroscopy provides a methodology for assessing the condition of the battery being monitored by comparing the wide-band impedance characteristics to a priori developed electrochemical models. This approach a llows for the early identification of potential failure m echanisms and hence determination of the remaining useful life of the battery (i.e., state-of-life), a critical step for prognostics. The focus of this paper will be on the design and implementation of the BPS. Critical design elements will be presented along with performance results from initial system testing, and an analysis of the potential benefits that may be accrued from an operational system.