Method and apparatus for charging batteries utilizing heterogeneous reaction kinetics
First Claim
1. An apparatus for rapidly charging a rechargeable battery, said apparatus comprising:
- generator means for generating a charging current having a variable level, and during a high charging period said charging current having a high level to rapidly charge the battery;
controller means for controlling said generator means, said controller means including;
(a) current control means for decreasing said charging current below said high level during said high charging period for a predetermined test interval; and
(b) evaluation means for determining a charge acceptance ability of the battery during said test interval without exceeding said charge acceptance ability;
wherein said evaluation means comprises means for measuring the slope of the battery voltage response to said decrease in said charging current, and wherein said current control means controls said charging current in response to said evaluation means.
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Abstract
A method and apparatus utilizing a new parameter for assessing battery charge acceptance for controlling the charging process of the battery. The charge acceptance parameter comprises a terminal voltage profile which is determined during a variation in a diagnostic current. The slope of the terminal voltage profile is used in the charging process to assess the charge acceptance ability of the battery and thereby control the charging current. For a first group of batteries including lead-acid and nickel-cadmium batteries, the terminal voltage profile is characterized by an increasing profile slope as the charge acceptance ability of the battery is reached. For a second group of batteries comprising nickel-metal hydride batteries, the terminal voltage profile is characterized by a profile slope which approaches zero as the charge acceptance ability of the battery is reached.
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Citations
22 Claims
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1. An apparatus for rapidly charging a rechargeable battery, said apparatus comprising:
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generator means for generating a charging current having a variable level, and during a high charging period said charging current having a high level to rapidly charge the battery;
controller means for controlling said generator means, said controller means including;
(a) current control means for decreasing said charging current below said high level during said high charging period for a predetermined test interval; and
(b) evaluation means for determining a charge acceptance ability of the battery during said test interval without exceeding said charge acceptance ability;
wherein said evaluation means comprises means for measuring the slope of the battery voltage response to said decrease in said charging current, and wherein said current control means controls said charging current in response to said evaluation means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of rapidly recharging a rechargeable battery, said method comprising the steps of:
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(a) supplying, during a high charging period, a charging current to the battery, said charging current having a variable level and having a level to rapidly charge the battery;
(b) decreasing said charging current during said high charging period for a predetermined test interval;
(c) determining a charge acceptance ability of the battery without exceeding said charge acceptance ability during said test interval; and
(d) controlling said charging current in response to said measurement of the slope of the battery voltage response, wherein said step of determining comprises measuring the slope of the battery voltage response to said decrease in said charging current. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification