Chemistry: electrical current producing apparatus – product – and – Sealed cell having gas prevention or elimation means – Prevention or elimination means is one of the cell...
Patent
1995-07-25
1997-06-17
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Sealed cell having gas prevention or elimation means
Prevention or elimination means is one of the cell...
H01M 1034
Patent
active
056395698
ABSTRACT:
A gastight, sealed metal oxide/metal hydride storage battery, in particular, a nickel/metal hydride button cell, includes an auxiliary electrode with an active material composed of the same hydrogen storage alloy as that of the negative electrode with which the auxiliary electrode is electrically associated. As a result, the auxiliary electrode can maintain both oxygen consumption as well as hydrogen consumption (in the event of overcharging or polarity reversal of the cell). High gas consumption rates in the event of overcharging and polarity reversal are achieved with a strongly hydrophobic adjustment of the auxiliary electrode and a relatively weakly hydrophobic or hydrophilic adjustment of the negative electrode (by means of hydrophobic or hydrophilic binder additions, respectively), and by adding a highly conductive metal powder (Cu or Ni) to the mass of the negative electrode. Also achieved is a good discharge capacity, even at high currents of up to 2 CA.
REFERENCES:
patent: 4246326 (1981-01-01), Sprengel et al.
patent: 5354576 (1994-10-01), Zhang et al.
patent: 5376474 (1994-12-01), Tadokoro et al.
patent: 5447806 (1995-09-01), Hoge et al.
Chen Guangsen
Kohler Uwe
Lindner Jurgen
Kalafut Stephen
Krueger Jonathan S.
Varta Batterie Aktiengesellschaft
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