Battery temperature derivative charging
First Claim
1. A method of charging a nickel-hydrogen battery which includes a positive electrode, a negative electrode, and an electrolyte, after the battery has been subject to discharge, the method comprising the steps of:
- (a) subjecting said battery to a high charge rate for a period until the battery temperature increases at least Δ
T1, where Δ
T1 is about 2°
C., over the local minimum battery temperature;
(b) switching the battery charge level to a lower rate of charge than in step (a) for a period until the battery temperature increases at least Δ
T2, where Δ
T2 is about 2°
C., over the local minimum battery temperature;
(c) switching the battery charge level to a trickle rate which is lower than step (b) for a period up to about 30 to 60 minutes before a next scheduled eclipse; and
thereafter (d) switching the battery to a pulse charge equivalent to the high charge rate of step (a).
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Abstract
A method of charging a nickel-hydrogen battery which includes a positive electrode, a negative electrode and an electrolyte, after the battery has been subject to discharge is disclosed the method comprising the steps of: (a) subjecting the battery to a high charge rate for a period until the battery temperature increases at least ΔT1 over the local minimum battery temperature; (b) switching the battery charge level to a lower rate of charge than in step (a) for a period until the battery temperature increases at least ΔT2 over the local minimum battery temperature; (c) switching the battery charge level to a much lower rate of charge than step (b) for a period up to about 30 to 60 minutes before the next scheduled eclipse; and thereafter (d) switching the battery to a pulse charge equivalent to the high charge rate of step (a).
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Citations
11 Claims
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1. A method of charging a nickel-hydrogen battery which includes a positive electrode, a negative electrode, and an electrolyte, after the battery has been subject to discharge, the method comprising the steps of:
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(a) subjecting said battery to a high charge rate for a period until the battery temperature increases at least Δ
T1, where Δ
T1 is about 2°
C., over the local minimum battery temperature;
(b) switching the battery charge level to a lower rate of charge than in step (a) for a period until the battery temperature increases at least Δ
T2, where Δ
T2 is about 2°
C., over the local minimum battery temperature;
(c) switching the battery charge level to a trickle rate which is lower than step (b) for a period up to about 30 to 60 minutes before a next scheduled eclipse; and
thereafter(d) switching the battery to a pulse charge equivalent to the high charge rate of step (a). - View Dependent Claims (2, 3, 4, 5, 6, 7, 10)
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8. A method of charging a nickel-hydrogen battery which includes a positive electrode, a negative electrode, and an electrolyte, the method comprising the steps of:
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(a) first subjecting the battery to a relatively high charge rate of about C/15, wherein C is the normal baseline or nameplate charge capacity of the battery for a period until the battery temperature increases about 2°
C. over the local minimum battery temperature;
(b) then switching the battery charge level to a medium level of charge rate of about C/30, wherein C is the normal baseline, or nameplate charge capacity of the battery for a period until the battery temperature increases about 2°
C. over the local minimum battery temperature;
(c) then switching the battery charge level to a low level of charge of about C/100, wherein C is the normal baseline, or nameplate charge capacity of the battery for a period up to about 30 to 60 minutes before a next scheduled eclipse; and
(d) then switching the battery to a pulse charge equivalent to high charge rate of step (a). - View Dependent Claims (9, 11)
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Specification