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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 ea

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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1. A battery system for vehicle, comprising: 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 a

1. A battery system for vehicle, comprising: 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; anda 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, wherein:the integrated circuits each comprise:a selection circuit that selects a terminal voltage of a battery cell that is a measurement target from among the terminal voltages at the individual battery cells in the corresponding cell group;an analog/digital converter that converts the terminal voltage selected by the selection circuit to a digital value;an abnormality diagnosis circuit that diagnoses an abnormality in a selection operation by the selection circuit;a timing control circuit that outputs a measurement phase instruction signal for instructing a measurement phase during which the terminal voltage is measured, and, in synchronization with the output of the measurement phase instruction signal, outputs a diagnosis phase instruction signal for instructing a diagnosis phase during which the diagnosis is executed by the abnormality diagnosis circuit;a communication circuit that transmits via the signal transmission path the terminal voltage converted to the digital value by the analog/digital converter and a diagnosis result by the abnormality diagnosis circuit; anda constant voltage generation circuit that generates a diagnosis voltage to be input to the selection circuit, wherein:based upon the measurement phase instruction signal, the analog/digital converter executes analog-to-digital conversion upon the terminal voltage selected by the selection circuit; andbased upon the diagnosis phase instruction signal, the abnormality diagnosis circuit compares, in synchronization with the measurement of the terminal voltage, an output from the selection circuit to which the diagnosis voltage has been input with a predetermined judgment value so as to diagnose the abnormality in the selection circuit. 2. A battery system for vehicle according to claim 1, wherein: the constant voltage generation circuit generates varying diagnosis voltages to the individual battery cells in the corresponding cell group; andthe abnormality diagnosis circuit executes the comparison using the predetermined judgment value according to the diagnosis voltage that has been input to the selection circuit. 3. A battery system for vehicle according to claim 1, wherein: each of the integrated circuits includes a second selection circuit that is disposed at a stage frontward of the selection circuit and selectively provides the selection circuit with a terminal voltage at a battery cell to be measured or the diagnosis voltage generated by the constant voltage generation circuit. 4. A battery system for vehicle according to claim 1, wherein: the timing control circuit synchronously outputs the measurement phase instruction signal and the diagnosis phase instruction signal for each of the battery cells in the corresponding cell group. 5. A battery system for vehicle according to claim 1, wherein: the integrated circuits each include:a stage circuit that manages each measurement phase of the terminal voltages of the plurality of battery cells to be measured by the integrated circuits;a first selection signal generation circuit that generates a first selection signal to be used to control a selection operation by the selection circuit based upon an output from the stage circuit;a second selection signal generation circuit that generates a second selection signal based upon an output from the stage circuit; anda selection signal abnormality diagnosis circuit that determines whether or not the outputs from the first and the second selection signal generation circuits sustain a predetermined relationship so as to diagnose an abnormality in the selection signal generation circuits. 6. A battery system for vehicle according to claim 1, comprising: a diagnosis result holding circuit that holds a diagnosis result by the abnormality diagnosis circuit, wherein:the signal transmission path includes a first signal transmission path and a second signal transmission path independently; andthe communication circuit transmits via the first signal transmission path the terminal voltage converted to the digital value by the analog/digital converter and constantly transmits via the second signal transmission path a signal according to the diagnosis result held in the diagnosis result holding circuit. 7. A battery system for vehicle, comprising: 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; anda 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, wherein:the integrated circuits each comprise:a selection circuit that selects a terminal voltage of a battery cell that is a measurement target from among the terminal voltages at the individual battery cells in the corresponding cell group;an analog/digital converter that converts the terminal voltage selected by the selection circuit to a digital value;a pull-up circuit that pulls up a potential at an output terminal of the selection circuit to a maximum potential at the integrated circuit;a pull-down circuit that pulls down a potential at an output terminal of the selection circuit to a minimum potential at the integrated circuit;an abnormality diagnosis circuit that diagnoses an abnormality in a selection operation by the selection circuit based upon a pull-up state by the pull-up circuit or a pull-down state by the pull-down circuit;a timing control circuit that outputs a measurement phase instruction signal for instructing a measurement phase during which the terminal voltage is measured, and, in synchronization with the output of the measurement phase instruction signal, outputs a diagnosis phase instruction signal for instructing a diagnosis phase during which the diagnosis is executed by the abnormality diagnosis circuit; anda communication circuit that transmits via the signal transmission path the terminal voltage converted to the digital value by the analog/digital converter and a diagnosis result by the abnormality diagnosis circuit, wherein:based upon the measurement phase instruction signal, the selection circuit selects the terminal voltage;based upon the measurement phase instruction signal, the analog/digital converter executes analog-to-digital conversion upon the terminal voltage selected by the selection circuit; andbased upon the diagnosis phase instruction signal, the abnormality diagnosis circuit diagnoses the abnormality in the selection circuit in synchronization with the measurement of the terminal voltage. 8. A battery system for vehicle according to claim 7, wherein: the timing control circuit synchronously outputs the measurement phase instruction signal and the diagnosis phase instruction signal for each of the battery cells in the corresponding cell group. 9. A battery system for vehicle according to claim 7, wherein: the integrated circuits each include:a stage circuit that manages each measurement phase of the terminal voltages of the plurality of battery cells to be measured by the integrated circuits;a first selection signal generation circuit that generates a first selection signal to be used to control a selection operation by the selection circuit based upon an output from the stage circuit;a second selection signal generation circuit that generates a second selection signal based upon an output from the stage circuit; anda selection signal abnormality diagnosis circuit that determines whether or not the outputs from the first and the second selection signal generation circuits sustain a predetermined relationship so as to diagnose an abnormality in the selection signal generation circuits. 10. A battery system for vehicle according to claim 7, comprising: a diagnosis result holding circuit that holds a diagnosis result by the abnormality diagnosis circuit, wherein:the signal transmission path includes a first signal transmission path and a second signal transmission path independently; andthe communication circuit transmits via the first signal transmission path the terminal voltage converted to the digital value by the analog/digital converter and constantly transmits via the second signal transmission path a signal according to the diagnosis result held in the diagnosis result holding circuit. 11. An on-vehicle battery module, comprising: an external case for the battery module;a lithium ion battery cell unit that is constituted with a plurality of serially connected lithium ion battery cell groups each include a plurality of serially connected lithium ion battery cells that are disposed in the external case;a positive pole-side power cable and a negative pole-side power cable through which power is output from the lithium ion battery cell unit;a cell controller that includes a plurality of integrated circuits each disposed in correspondence to one of the groups of the lithium ion battery cell and measures each of the terminal voltages at the plurality of lithium ion battery cells;a plurality of detection harnesses via which the terminal voltages at the lithium ion battery cells are supplied to the corresponding integrated circuits in the cell controller;a battery controller; anda transmission path through which information is transmitted between one of the integrated circuits and another one of the integrated circuits or between one of the integrated circuits and the battery controller, wherein:the integrated circuits each include a selection circuit that selects in a predetermined order a plurality of the terminal voltages supplied via the detection harnesses, a voltage detection circuit that measures the selected terminal voltages, and a diagnosis circuit that diagnoses an abnormality in the selection circuit;the integrated circuits each execute independently a cyclic measurement of terminal voltages at individual lithium ion battery cells in a corresponding group and a cyclic abnormality diagnosis of the selection circuit; andbased upon an instruction from the battery controller, each of the integrated circuits transmits a measurement result of the terminal voltages to the battery controller and constantly outputs a result of the abnormality diagnosis to the battery controller. 12. A cell controller for an on-vehicle battery module that receives terminal voltages at each lithium ion battery cell from a lithium ion battery cell unit constituted with a plurality of serially connected lithium ion battery cell groups, each of which includes a plurality of lithium ion battery cells, and measures the terminal voltages at each of the lithium ion battery cells, comprising: a plurality of integrated circuits each disposed in correspondence to one of the lithium ion battery cell groups; anda transmission path through which information is transmitted between one of the integrated circuits and another one of the integrated circuits or between one of the integrated circuits and a circuit other than that of the integrated circuits, wherein:the integrated circuits each include a selection circuit that selects in a predetermined order terminal voltages at a plurality of lithium ion battery cells transmitted from a corresponding lithium ion battery cell group, a voltage measurement circuit that measures the selected terminal voltages, a diagnosis circuit that diagnoses an abnormality in the selection circuit, and a transmission/reception circuit;the integrated circuits each execute independently a cyclic measurement of the transmitted terminal voltages and a cyclic abnormality diagnosis of the selection circuit; andbased upon an instruction, the transmission/reception circuit transmits measurement results of the terminal voltages and constantly outputs results of the abnormality diagnosis.