Method for determining the state of charge of rechargeable batteries by integration of the amounts of current flowing during charging and discharging
First Claim
1. A method for determining the state of charge of a rechargeable battery by integration of amounts of current flowing during charging and discharging comprising:
- determining a first state of charge value LZA by continuous integration of the rechargeable battery current;
determining a second state of charge value LZB by measuring a no-load voltage U0 after receiving or supplying a selected amount of charge Q sufficient to leave a region of mixed potential of electrodes of the battery and to reach a no-load voltage of the rechargeable battery and by comparing the measured no-load voltage U0 with empirically determined no-load voltage characteristics for the rechargeable battery;
assessing reliability of LZA based on charge throughput in the battery;
assessing reliability of LZB based on the amount of charge Q which has flowed through the battery, wherein the amount of charge Q is between about 1 and about 40% of the rated capacity of the rechargeable battery; and
selecting the state of charge of the battery from the obtained state of charge values based on a highest value of reliability of LZA or LZB.
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Accused Products
Abstract
In a method for determining the state of charge of rechargeable batteries by integration of the amounts of current flowing during charging and discharging, a first state of charge value LZA is determined by continuous integration of the rechargeable battery current. A second state of charge value LZB is determined by measurement of the no-load voltage U0 after receiving or supplying a defined amount of charge Q which is sufficient in order to leave the region of the mixed potential of the electrodes and to reach a no-load voltage of the rechargeable battery, and by comparison of this measured no-load voltage U0 with empirically determined no-load voltage characteristics for the rechargeable battery. From the state of charge values obtained in this way, that state of charge value is chosen which is more reliable in the preceding operating conditions, with the assessment of LZA taking into account in particular the charge throughput in the assessment of LZB, in particular the amount of charge Q which has flowed. The amount of charge Q should be at least 1 to 40%, preferably 5 to 50%, of the rated capacity of the rechargeable battery.
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Citations
9 Claims
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1. A method for determining the state of charge of a rechargeable battery by integration of amounts of current flowing during charging and discharging comprising:
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determining a first state of charge value LZA by continuous integration of the rechargeable battery current;
determining a second state of charge value LZB by measuring a no-load voltage U0 after receiving or supplying a selected amount of charge Q sufficient to leave a region of mixed potential of electrodes of the battery and to reach a no-load voltage of the rechargeable battery and by comparing the measured no-load voltage U0 with empirically determined no-load voltage characteristics for the rechargeable battery;
assessing reliability of LZA based on charge throughput in the battery;
assessing reliability of LZB based on the amount of charge Q which has flowed through the battery, wherein the amount of charge Q is between about 1 and about 40% of the rated capacity of the rechargeable battery; and
selecting the state of charge of the battery from the obtained state of charge values based on a highest value of reliability of LZA or LZB. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification