Analysis of pressure variations in a low-pressure nickel-hydrogen battery: Part 1

被引:4
作者
Purushothaman, B. K. [1 ]
Wainright, J. S. [1 ]
机构
[1] Case Western Reserve Univ, Dept Chem Engn, Cleveland, OH 44106 USA
关键词
Nickel hydrogen battery; State of charge; Fuel gauging; Metal hydride; Pressure analysis; STIMULATION;
D O I
10.1016/j.jpowsour.2012.01.150
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A low pressure nickel-hydrogen battery using either a metal hydride or gaseous hydrogen for H-2 storage has been developed for use in implantable neuroprosthetic devices. In this paper, pressure variations inside the cell for the gaseous hydrogen version are analyzed and correlated with oxygen evolution side reaction at the end of charging, the recombination of oxygen with hydrogen during charging and a subsequent rest period, and the self-discharge of the nickel electrode. About 70% of the recombination occurred simultaneously with oxygen evolution during charging and the remaining oxygen recombined with hydrogen during the 1st hour after charging. Self-discharge of the cell varies linearly with hydrogen pressure at a given state of charge and increased with increasing battery charge levels. The coulometric efficiency calculated based on analysis of the pressure-time data agreed well with the efficiency calculated based on the current-time data. Pressure variations in the battery are simulated accurately to predict coulometric efficiency and the state of charge of the cell, factors of extreme importance for a battery intended for implantation within the human body. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:429 / 435
页数:7
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