Method and apparatus for determining the state-of-charge of a battery
First Claim
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1. A method of determination of the state-of-charge of a battery, the method comprising:
- detecting that the battery is in a rest state, wherein the battery comprises one or more battery cells, battery blocks or battery packs;
coupling a pre-conditioning logic to the battery;
drawing a pre-conditioning current from the battery using the pre-conditioning logic, sufficient to reduce charge of the battery by a charge reduction threshold value that is predetermined to reduce an open circuit voltage to state-of-charge determination error, in response to detecting that the battery is in the rest state to affect a correlation between the state-of-charge of the battery and an open-circuit voltage of the battery;
measuring the open-circuit voltage of the battery after drawing the pre-conditioning current; and
determining the state-of-charge of the battery based on the open-circuit voltage of the batterywherein the determining is subsequent to the completion of a partial discharge of the battery in the rest state.
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Abstract
A method and apparatus for determining the state-of-charge of a battery. In response to detecting that the battery is in a rest state, a pre-conditioning current is drawn from the battery to affect a correlation between the state-of-charge of the battery and an open-circuit voltage of the battery. Thereafter, the open-circuit voltage of the battery is measured, and used to determine the state-of-charge.
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Citations
23 Claims
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1. A method of determination of the state-of-charge of a battery, the method comprising:
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detecting that the battery is in a rest state, wherein the battery comprises one or more battery cells, battery blocks or battery packs; coupling a pre-conditioning logic to the battery; drawing a pre-conditioning current from the battery using the pre-conditioning logic, sufficient to reduce charge of the battery by a charge reduction threshold value that is predetermined to reduce an open circuit voltage to state-of-charge determination error, in response to detecting that the battery is in the rest state to affect a correlation between the state-of-charge of the battery and an open-circuit voltage of the battery; measuring the open-circuit voltage of the battery after drawing the pre-conditioning current; and determining the state-of-charge of the battery based on the open-circuit voltage of the battery wherein the determining is subsequent to the completion of a partial discharge of the battery in the rest state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A battery management apparatus for managing operations with respect to a battery, the battery management apparatus comprising:
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status logic to detect whether the battery is in a rest state, wherein the battery comprises one or more battery cells, battery blocks or battery packs; pre-conditioning logic to draw a pre-conditioning current from the battery that is sufficient to reduce charge of the battery by a charge reduction threshold value that is predetermined to reduce an open circuit voltage to state-of-charge determination error, in response to detecting that the battery is in the rest state to affect a correlation between the state-of-charge of the battery and an open-circuit voltage of the battery; voltage measurement logic to measure the open-circuit voltage of the battery after drawing the pre-conditioning current; and state-of-charge determination logic to determine the state-of-charge of the battery based on the open-circuit voltage of the battery wherein the determining is subsequent to the completion of a partial discharge of the battery in the rest state. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A battery management apparatus for managing operations with respect to a battery, the battery management apparatus comprising:
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means for detecting whether the battery is in a rest state, wherein the battery comprises one or more battery cells, battery blocks or battery packs; means for drawing a pre-conditioning current from the battery, that is sufficient to reduce charge of the battery by a charge reduction threshold value that is predetermined to reduce an open circuit voltage to state-of-charge determination error, in response to detecting that the battery is in the rest state to affect a correlation between the state-of-charge of the battery and an open-circuit voltage of the battery; means for measuring the open-circuit voltage of the battery after drawing the pre-conditioning current; and means for determining the state-of-charge of the battery based on the open-circuit voltage of the battery wherein the determining is subsequent to the completion of a partial discharge of the battery in the rest state.
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Specification