Spatially Resolved Measurements of Magnetic Fields Applied to Current Distribution Problems in Batteries
Spatially Resolved Measurements of Magnetic Fields Applied to Current Distribution Problems in Batteries
复制标题
DOI：
10.1109/tim.2014.2362432
复制
发表时间：
2015-04
影响因子：
5.6
通讯作者：
James E. Green;D. Stone;M. Foster;A. Tennant
中科院分区：
文献类型：
--
作者：
James E. Green;D. Stone;M. Foster;A. Tennant
本文提出了一种新的仪器系统的空间分辨测量的稳态和缓慢的时变磁场。仪器系统的测量区域为400 mm × 200 mm，由256个磁性像素组成，每个像素测量穿过像素区域中心的磁场，作为三个正交矢量。所选传感器的最小分辨率约为1.0 × 10-7 T，最大可测磁场为8.0 × 10-4 T。磁场数据可以以大约每秒一帧的速度记录。本文还报告了该仪器系统的应用，铅酸蓄电池和混合电池超级电容器组合的测量。本文的目的是推断，为第一次，电池体积内的移动电荷分布通过测量磁场产生的移动电荷。据报道，经验测试表明，电流分布作为板远离端子的距离增加的函数，在本质上很可能是指数的，大部分电流在电池的最上部流动。
This paper presents a novel instrumentation system for spatially resolved measurements of steady-state and slowly time-varying magnetic fields. The instrumentation system has a measurement area of 400 mm × 200 mm consisting of 256 magnetic pixels each measuring the magnetic field crossing the center of the pixel area as three orthogonal vectors. The specified minimum resolution of our chosen sensor is approximately 1.0 × 10-7 T and the maximum specified measurable magnetic field is 8.0 × 10-4 T. Magnetic field data can be recorded at approximately one frame per second. This paper also reports the application of this instrumentation system to measurements on lead acid batteries and hybridized battery ultracapacitor combinations. The objective of this paper is to infer, for the first time, the moving charge distribution inside the battery volume by measuring the magnetic field resulting from the moving charge. Empirical tests are reported which show the current distribution as a function of increasing distance down the plate away from the terminal is highly likely to be exponential in nature, with most current flowing in the uppermost portion of the battery.