Battery cell voltage measuring apparatus and method
First Claim
1. A battery cell voltage measuring apparatus, comprising:
- a plurality of floating capacitors provided corresponding to a plurality of cells contained in a battery pack;
a first switch for connecting one terminal of each corresponding floating capacitor to one terminal of each corresponding cell in a charge mode or connecting a reference potential to the one terminal of the floating capacitor in a measuring mode;
a second switch for connecting the other terminal of each corresponding floating capacitor to the other terminal of each corresponding cell in the charge mode or connecting a common cell voltage measuring line to the other terminal of the floating capacitor in the measuring mode; and
a cell voltage detector for measuring a voltage of each cell by switching each of the first and second switches into the charge mode to charge the voltage of each cell on each corresponding floating capacitor and time-differentially switching each of the first and second switches into the measurement mode to apply the cell voltage charged on the floating capacitor between the reference potential and the common cell voltage measuring line such that the cell voltage has the same polarity.
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Accused Products
Abstract
Disclosed is a battery cell voltage measuring apparatus and method. The battery cell voltage measuring apparatus comprises a plurality of floating capacitors provided corresponding to a plurality of cells contained in a battery pack; a plurality of switching units provided corresponding to each cell of the battery pack and switchable into a charge mode or a measurement mode; and a cell voltage detector for measuring the voltage of each cell by switching each switching unit into a charge mode to charge the voltage of each cell on each corresponding floating capacitor and time-differentially switching each switching unit into a measurement mode to apply the cell voltage charged on the floating capacitor between a reference potential and a common cell voltage measuring line.
11 Citations
22 Claims
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1. A battery cell voltage measuring apparatus, comprising:
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a plurality of floating capacitors provided corresponding to a plurality of cells contained in a battery pack; a first switch for connecting one terminal of each corresponding floating capacitor to one terminal of each corresponding cell in a charge mode or connecting a reference potential to the one terminal of the floating capacitor in a measuring mode; a second switch for connecting the other terminal of each corresponding floating capacitor to the other terminal of each corresponding cell in the charge mode or connecting a common cell voltage measuring line to the other terminal of the floating capacitor in the measuring mode; and a cell voltage detector for measuring a voltage of each cell by switching each of the first and second switches into the charge mode to charge the voltage of each cell on each corresponding floating capacitor and time-differentially switching each of the first and second switches into the measurement mode to apply the cell voltage charged on the floating capacitor between the reference potential and the common cell voltage measuring line such that the cell voltage has the same polarity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A battery cell voltage measuring method which measures a battery cell voltage using a plurality of floating capacitors provided corresponding to a plurality of cells contained in a battery;
- pack and a first switch for connecting one terminal of each corresponding floating capacitor to one terminal of each corresponding cell in a charge mode or connecting a reference potential to the one terminal of the floating capacitor in a measuring mode; and
a second switch for connecting the other terminal of each corresponding floating capacitor to the other terminal of each corresponding cell in the charge mode or connecting a common cell voltage measuring line to the other terminal of the floating capacitor in the measuring mode, the method comprising;(a) switching the first and second switches into the charge mode to charge a voltage of each cell on each corresponding floating capacitor; and (b) time-differentially switching each of the first and second switches into the measurement mode to apply the cell voltage charged on the floating capacitor between the reference potential and the common cell voltage measuring line such that the cell voltage has the same polarity, and measuring the cell voltage. - View Dependent Claims (19, 20, 21, 22)
- pack and a first switch for connecting one terminal of each corresponding floating capacitor to one terminal of each corresponding cell in a charge mode or connecting a reference potential to the one terminal of the floating capacitor in a measuring mode; and
Specification