Weight of single plate in batch is used as criterion for selecting those plates with uniform, high ampere hour capacity. When substrate and plaque weights are uniform, observed current capacity differences are dependent on quantity of active material in plaque

Halpert, G.

English

NASA Technical Reports Server

November 1971 Brief 71-10411 
NASA TECH BRIEF 
Goddard Space Flight Center
	
_CV 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a aubscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the. Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D. F. 20546. 
Screening Method Improves Performance of Nickel-Cadmium Batteries 
S
Methods for selecting and screening nickel-cad-
mium cell materials used in batteries can be used for 
improving battery performance and reliability. Test 
results show the weight of a single plate within a 
batch can be used as a criterion for selecting those 
plates which have a uniform, high plate ampere 
hour capacity. A statistical analysis of these results 
shows high weight-to-capacity correlations, and gives 
a reliable means of predicting the capacity of a 
plate from its weight alone. 
The battery plates were fabricated by sintering 
nickel powder onto a screen (or perforated sheet 
substrate) to form an 80% porous plaque structure. 
The plaque was then impregnated with . the active 
material; i.e., nickel hyroxide for the positive plate 
and cadmium hydroxide for the negative plate. 
In five out of six groups tested, plates with the 
lowest weight had the lowest ampere hour capaci-
ties, and those with the highest weight had the high-
est capacities. These results lead to the conclusion 
that, when the substrate and plaque weights are 
uniform, the observed current capacity differences 
are dependent on the quantity of the active material 
in the plaque.
Additional testing of plates and other battery 
materials is continuing in order to improve the 
screening methods and control techniques. 
The use of this screening method on a recent 
Orbiting Astronomical Observatory (OAO) resulted 
in a reduction of cell capacity spread from ± 7% to 
±3%, or a 50% improvement in tolerance. 
Note: 
Requests for further information may be directed 
to:
Technology Utilization Officer 
Code 207.1 
Goddard Space Flight Center 
Greenbelt, Maryland 20771 
Reference: B71-10411 
Patent status: 
No patent action is contemplated by NASA 
Source: G. Halpert

Goddard Space Flight Center

(G SC- 1 1260) 
Category 04 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19710000408 2020-03-17T02:29:59+00:00Z


Screening method improves performance of nickel-cadmium batteries

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