Life testing of plastic optical fibers for lead-acid battery fast charge equipment

J. Acevedo, A. Paz, S. Fernandez-Gomez, M. Soria
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Abstract

Our research has been focused in the past years on the development of efficient fast battery chargers of application to electrical vehicles. One of the challenges that we are facing is selecting adequate sensing components to accurately monitor the charging process, due to the harsh environment in the batteries that use an electrolyte with sulfuric acid (H2SO4) at an elevated temperature during the charge process. The sensor must be able to measure the electrolyte density at different places within the battery -density varies with location. The accuracy of the density readout must be maintained through the useful life of the vehicle. In this paper we review our current line of research in fast battery charges as it pertains to their reliability. We present our results on accelerated tests using plastic fiber optics as sensing elements for electrolyte density. The test duration was over one calendar year (9,552 hours) using a sensor with four optical fibers. Three of the optical fibers are used to measure density, and the fourth one as a reference to account for common-mode variation. The charge level of the battery can be derived from this density measurement, as well as the overall health of the battery. For the test, the electrolyte acid density was set to 35%, and the temperature to 70 degrees Celsius. An electronic system for emission and detection of light collected data periodically to assess the transmission loss in the fibers as they aged.
铅酸蓄电池快充设备用塑料光纤寿命试验
在过去的几年里,我们的研究重点是开发适用于电动汽车的高效快速电池充电器。我们面临的挑战之一是选择足够的传感元件来准确监测充电过程,因为在充电过程中使用含有硫酸(H2SO4)的电解质的电池环境恶劣,温度升高。传感器必须能够测量电池内不同位置的电解质密度-密度随位置而变化。必须在车辆的使用寿命期间保持密度读数的准确性。在本文中,我们回顾了我们目前在快速电池充电方面的研究,因为它涉及到它们的可靠性。我们介绍了使用塑料光纤作为电解液密度传感元件的加速测试结果。使用带有四根光纤的传感器,测试持续时间超过一个日历年(9,552小时)。其中三根光纤用于测量密度,第四根作为参考,用于计算共模变化。电池的充电水平可以从密度测量中得出,以及电池的整体健康状况。在测试中,电解液的酸密度设置为35%,温度设置为70摄氏度。用于发射和探测光的电子系统定期收集数据,以评估光纤老化时的传输损耗。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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