Heat generation during overcharge of Ni/H2 cells
- Author:
- Vaidyanathan, Hari
- Published:
- Feb 1, 1992.
- Physical Description:
- 1 electronic document
- Additional Creators:
- Earl, M. W. and Kelly, W. H.
Online Version
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- Restrictions on Access:
- Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access - Summary:
- Information is given in viewgraph form on the heat generation during overcharge of nickel hydrogen cells. The heat dissipated during various rates of charge and overcharge was measured, using a radiative type calorimeter. Measurements made during the charging of the cell indicated that the total heat was greatest for C/10 charge, compared with C/2 or C/4. The endothermic to exothermic transition occurred at 1.43 V for C/10 charge, and increased to 1.467 V at C/2 charge. The magnitude of the endothermic heat was only 3.7 percent of the total heat generated during charging. Experimentally measured values were compared against those calculated using a thermoneutral potential of 1.51 V. Although there was general agreement between the calculated and measured values, a significant difference existed in the instantaneous heat values for the initial stages of cell discharge. Heat dissipated during self-discharge appears to depend on the charge rate preceding open circuit stand.
- Other Subject(s):
- Collection:
- NASA Technical Reports Server (NTRS) Collection.
- Note:
- Document ID: 19920013530.
Accession ID: 92N22773.
NASA. Marshall Space Flight Center, The 1991 NASA Aerospace Battery Workshop; p 717-741. - Terms of Use and Reproduction:
- No Copyright.
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