Disconnection detection device of assembled battery system and disconnection detection method of same
First Claim
1. A disconnection detection device for detecting disconnection of at least a portion of an assembled battery in an assembled battery system, the disconnection detection device comprising:
- a plurality of secondary battery cells serially connected to form the assembled battery; and
a plurality of monitoring circuits, ones of which are connected in parallel to respective ones of the plurality of secondary battery cells, each of the plurality of monitoring circuits configured to monitor a charge/discharge state of a corresponding one of the plurality of secondary battery cells, the each of the plurality of monitoring cells including;
current supplying means for supplying a detection current;
current route changing means for changing a route in which the detection current flows; and
disconnection detecting means,wherein, when a disconnection occurs;
the current supplying means supplies the detection current larger than a consumption current flowing via the monitoring circuit at a normal state to a connection line between the cell and the monitoring circuit;
the current route changing means changes the route in which the detection current flows so as to generate a reversal of an electric potential relation between a positive-side and a negative-side of the corresponding one of the plurality of secondary battery cells; and
the disconnection detecting means detects the reversal of the electric potential relation and outputs a disconnection detection signal.
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Accused Products
Abstract
Upon detecting a disconnection, a current detection circuit supplies a detection current to connection lines between each cell and the corresponding voltage monitoring circuit. The detection current is larger than a consumption current flowing via each voltage monitoring circuit in a normal state. When the disconnection occurs, a diode changes a route in which the detection current flows so as to reverse an electric potential relation between a positive-side power line and a negative-side power line of the corresponding cell and a reverse detection circuit detects the reverse of the electric potential relation to output a disconnection detection signal.
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Citations
9 Claims
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1. A disconnection detection device for detecting disconnection of at least a portion of an assembled battery in an assembled battery system, the disconnection detection device comprising:
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a plurality of secondary battery cells serially connected to form the assembled battery; and a plurality of monitoring circuits, ones of which are connected in parallel to respective ones of the plurality of secondary battery cells, each of the plurality of monitoring circuits configured to monitor a charge/discharge state of a corresponding one of the plurality of secondary battery cells, the each of the plurality of monitoring cells including; current supplying means for supplying a detection current; current route changing means for changing a route in which the detection current flows; and disconnection detecting means, wherein, when a disconnection occurs; the current supplying means supplies the detection current larger than a consumption current flowing via the monitoring circuit at a normal state to a connection line between the cell and the monitoring circuit; the current route changing means changes the route in which the detection current flows so as to generate a reversal of an electric potential relation between a positive-side and a negative-side of the corresponding one of the plurality of secondary battery cells; and the disconnection detecting means detects the reversal of the electric potential relation and outputs a disconnection detection signal. - View Dependent Claims (2, 3, 5, 6, 7)
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4. A disconnection detection device for detecting a disconnection of at least a portion of an assembled battery in an assembled battery system, the disconnection detection device comprising:
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an assembled battery formed by serially connecting a plurality of secondary battery cells; and a plurality of monitoring circuits connected in parallel to the plurality of secondary battery cells, each of the plurality of monitoring circuits configured to monitor a charge/discharge state of a corresponding one of the plurality of secondary battery cells, the each of the plurality of monitoring circuits including; current route changing means connected in parallel with the corresponding one and between the corresponding one and the each, the current route changing means further connected on one side thereof to a first one of the plurality of secondary battery cells arranged at a maximum electric potential side and a second one of the plurality of secondary battery cells arranged at a minimum electric potential side of the assembled battery; and disconnection detecting means coupled to the current route changing means, wherein; when a disconnection occurs in one of a power line at the maximum electric potential side and a power line at the minimum electric potential side, the current route changing means changes a route of the current flowing between a positive-side power line and a negative-side power line of the corresponding one of the plurality of secondary battery cells so as to reverse an electric potential relation between the positive side power line and the negative side power line; and the disconnection detecting means detects the reversal of the electric potential relation to output a disconnection detection signal.
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8. A method for detecting a disconnection in an assembled battery system including an assembled battery formed by serially connecting a plurality of secondary battery cells and a plurality of monitoring circuits connected in parallel to the plurality of secondary battery cells, ones of the plurality of monitoring circuits configured to monitor a charge/discharge state of corresponding ones of the plurality of secondary battery cells, the method, upon a disconnection, comprising:
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supplying a detection current to a connection line between the cell and the monitoring circuit, the detection current larger than a consumption current flowing via the monitoring circuit in a normal state; changing a route in which the detection current flows so as to generate a reversal of an electric potential relation between a positive-side power line and a negative-side power line of the corresponding on of the plurality of secondary battery cells; and detecting the reversal of the electric potential relation to output a disconnection detection signal.
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9. A method for detecting a disconnection in an assembled battery system including an assembled battery formed by serially connecting a plurality of secondary battery cells and a plurality of monitoring circuits connected in parallel to the plurality of secondary battery cells, ones of the plurality of monitoring circuits configured to monitor a charge/discharge state of corresponding ones of the secondary battery cells, the disconnection occurring between one of the plurality of secondary battery cells arranged at a maximum electric potential side and another of the plurality of secondary battery cells arranged at a minimum electric potential side of the assembled battery, the disconnection detected in the ones of the plurality of monitoring circuit, the method comprising:
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changing a route of the current flowing between a positive-side power line and a negative-side power line of the corresponding cell when the disconnection occurs in a power line at the maximum electric potential side or in a power line at the minimum electric potential side, the changing the route performed so as to generate a reversal of an electric potential relation between the positive-side power line and the negative-side power line; and detecting the reversal of the electric potential relation to detect a disconnection detection.
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Specification