Battery system for vehicle, on-vehicle battery module, and cell controller
First Claim
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1. A battery system, comprising:
- a battery module that includes a plurality of battery cells which are electrically connected in series;
a voltage measurement circuit that measures a terminal voltage of each of the plurality of battery cells; and
a diagnosis circuit that diagnoses an abnormality in a circuit, wherein;
the voltage measurement circuit includesa selection circuit that selects a terminal voltage of a battery cell to be measured from among terminal voltages of the plurality of battery cells,a pull-up circuit that pulls up a potential at an output terminal of the selection circuit to a high potential, anda pull-down circuit that pulls down a potential at the output terminal of the selection circuit to a low potential; and
the diagnosis circuitdiagnoses whether or not a plurality of switches constituting the selection circuit are all in an open state when the plurality of switches constituting the selection circuit were all to be in an open state, based on whether or not a relationship between a threshold value and a voltage of the output terminal of the selection circuit, which has been measured by the voltage measurement circuit in a pulled-up state or pulled-down state, meets a relationship when the plurality of switches constituting the selection circuit are all in an open state, and thendiagnoses whether or not a battery cell to be measured is selected by a specific switch of the plurality of switches constituting the selection circuit when the specific switch was to be in a closed state, based on whether or not a relationship between a threshold value and a voltage of the output terminal of the selection circuit, which has been measured by the voltage measurement circuit in a pulled-up state or pulled-down state, meets a relationship when the specific switch is in a closed state.
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Abstract
A battery system for vehicle comprises a battery unit that is constituted with a plurality of serially connected cell groups each include a plurality of serially connected battery cells, integrated circuits that are each disposed in correspondence to one of the cell groups of the battery unit and each measure terminal voltages at the battery cells in the corresponding cell group, and a signal transmission path through which one of the integrated circuits is connected to another one of the integrated circuits or to a circuit other than that of the integrated circuits.
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Citations
8 Claims
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1. A battery system, comprising:
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a battery module that includes a plurality of battery cells which are electrically connected in series; a voltage measurement circuit that measures a terminal voltage of each of the plurality of battery cells; and a diagnosis circuit that diagnoses an abnormality in a circuit, wherein; the voltage measurement circuit includes a selection circuit that selects a terminal voltage of a battery cell to be measured from among terminal voltages of the plurality of battery cells, a pull-up circuit that pulls up a potential at an output terminal of the selection circuit to a high potential, and a pull-down circuit that pulls down a potential at the output terminal of the selection circuit to a low potential; and the diagnosis circuit diagnoses whether or not a plurality of switches constituting the selection circuit are all in an open state when the plurality of switches constituting the selection circuit were all to be in an open state, based on whether or not a relationship between a threshold value and a voltage of the output terminal of the selection circuit, which has been measured by the voltage measurement circuit in a pulled-up state or pulled-down state, meets a relationship when the plurality of switches constituting the selection circuit are all in an open state, and then diagnoses whether or not a battery cell to be measured is selected by a specific switch of the plurality of switches constituting the selection circuit when the specific switch was to be in a closed state, based on whether or not a relationship between a threshold value and a voltage of the output terminal of the selection circuit, which has been measured by the voltage measurement circuit in a pulled-up state or pulled-down state, meets a relationship when the specific switch is in a closed state. - View Dependent Claims (2, 3, 4)
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5. A battery monitoring device, comprising:
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a voltage measurement circuit that measures a terminal voltage of each of a plurality of battery cells which are electrically connected in series; and a diagnosis circuit that diagnoses an abnormality in a circuit, wherein; the voltage measurement circuit includes a selection circuit that selects a terminal voltage of a battery cell to be measured from among terminal voltages of the plurality of battery cells, a pull-up circuit that pulls up a potential at an output terminal of the selection circuit to a high potential, and a pull-down circuit that pulls down a potential at the output terminal of the selection circuit to a low potential; the diagnosis circuit diagnoses whether or not a plurality of switches constituting the selection circuit are all in an open state when the plurality of switches constituting the selection circuit were all to be in an open state, based on whether or not a relationship between a threshold value and a voltage of the output terminal of the selection circuit, which has been measured by the voltage measurement circuit in a pulled-up state or pulled-down state, meets a relationship when the plurality of switches constituting the selection circuit are all in an open state, and then diagnoses whether or not a battery cell to be measured is selected by a specific switch of the plurality of switches constituting the selection circuit when the specific switch was to be in a closed state, based on whether or not a relationship between a threshold value and a voltage of the output terminal of the selection circuit, which has been measured by the voltage measurement circuit in a pulled-up state or pulled-down state, meets a relationship when the specific switch is in a closed state. - View Dependent Claims (6, 7, 8)
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Specification