Monitoring circuit for an energy store and method for monitoring an energy store
First Claim
1. A monitoring circuit for an energy storage device, the energy storage device having a multiplicity of cells each having a first terminal and a second terminal, that provide a voltage in each case between the first terminal and second terminal, and which are connected in series, wherein in each case the second terminal of a first cell is connected to the first terminal of a second cell, the monitoring circuit comprising:
- at least two voltage-measuring circuits including a first voltage-measuring circuit and a second voltage-measuring circuit each having a first measuring input and a second measuring input, said voltage-measuring circuits each measuring a voltage between said first measuring input and said second measuring input of said voltage-measuring circuits, said second measuring input of said first voltage-measuring circuit is connected to said first measuring input of said second voltage-measuring circuit;
a first connecting lead for connecting the first terminal of the first cell to said first measuring input of said first voltage-measuring circuit;
a second connecting lead for connecting the second terminal of the first cell to said second measuring input of said first voltage-measuring circuit; and
a first loading resistor capable of being switched between said second measuring input of said first voltage-measuring circuit and a first fixed potential.
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Accused Products
Abstract
A monitoring circuit is provided for an energy storage device. The energy storage device has a plurality of cells which each provide a voltage between their first and second connections and are switched in series. At least two voltage measuring circuits are provided, wherein the voltage measuring circuits each measure the voltage between a first measurement input and a second measurement input. A first connection conductor connects the first terminal of the first cell to the first measurement input of a first voltage measurement circuit. A second connection conductor connects the second terminal of the first cell to the second measurement input of a first voltage measurement circuit. A first load resistor can be switched between the first measurement input of the second voltage measurement circuit and a first fixed potential.
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Citations
14 Claims
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1. A monitoring circuit for an energy storage device, the energy storage device having a multiplicity of cells each having a first terminal and a second terminal, that provide a voltage in each case between the first terminal and second terminal, and which are connected in series, wherein in each case the second terminal of a first cell is connected to the first terminal of a second cell, the monitoring circuit comprising:
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at least two voltage-measuring circuits including a first voltage-measuring circuit and a second voltage-measuring circuit each having a first measuring input and a second measuring input, said voltage-measuring circuits each measuring a voltage between said first measuring input and said second measuring input of said voltage-measuring circuits, said second measuring input of said first voltage-measuring circuit is connected to said first measuring input of said second voltage-measuring circuit; a first connecting lead for connecting the first terminal of the first cell to said first measuring input of said first voltage-measuring circuit; a second connecting lead for connecting the second terminal of the first cell to said second measuring input of said first voltage-measuring circuit; and a first loading resistor capable of being switched between said second measuring input of said first voltage-measuring circuit and a first fixed potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for monitoring an energy storage device, the energy storage device having a multiplicity of cells each having a first and a second terminal that provide a voltage in each case between the first and second terminals and are connected in series, wherein in each case a second terminal of a first cell is connected to a first terminal of a second cell, which comprises the steps of:
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a) providing a monitoring circuit containing; at least two voltage-measuring circuits including a first voltage-measuring circuit and a second voltage-measuring circuit each having a first measuring input and a second measuring input, the voltage-measuring circuits each measuring a voltage between the first measuring input and the second measuring input of the voltage-measuring circuits, the second measuring input of the first voltage-measuring circuit is connected to the first measuring input of the second voltage-measuring circuit; a first connecting lead for connecting the first terminal of the first cell to the first measuring input of the first voltage-measuring circuit; a second connecting lead for connecting the second terminal of the first cell to the second measuring input of the first voltage-measuring circuit; and a first loading resistor capable of being switched between the second measuring input of the first voltage-measuring circuit and a first fixed potential; b) switching the first loading resistor such that the first loading resistor does not form a connection between the second measuring input of the first voltage-measuring circuit and the first fixed potential; c) measuring the voltage at the first and second measuring inputs of the first voltage-measuring circuit resulting in a first measurement; d) switching the first loading resistor such that the first loading resistor forms a connection between the second measuring input of the first voltage-measuring circuit and the first fixed potential; e) measuring the voltage at the first and second measuring inputs of the first voltage-measuring circuit resulting in a second measurement; and f) comparing the first measurement with the second measurement. - View Dependent Claims (13, 14)
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Specification