A switch failure diagnosis device for using in a current path between an electric device and an electric storage device, the switch failure diagnosis device comprising:na plurality of switches connected parallel to each other in the current path between the electric device and the electric storage device;a switch terminal voltage detector configured to output a switch terminal voltage detection signal corresponding to a voltage across the switches; anda controller configured to:nselect the switches at different time in sequence and input an open instruction signal to each switch at a time when the switch is selected; anddetermine, based on the switch terminal voltage detection signal output while the open instruction signal is given, that at least one of the switches has a failure if the detected voltage is in a failure determination range.
›2.↳ 1The switch failure diagnosis device according to claim 1, wherein the controller is further configured to:ndetermine whether the electric device is in…d2+1
The switch failure diagnosis device according to claim 1, wherein the controller is further configured to:ndetermine whether the electric device is in an energized state or a non-energized state;determine whether at least one of the switches has a failure if the electric device is determined to be in the non-energized state; andinput the open instruction signal to the switch and determine whether at least one of the switches has a failure if the electric device is determined to be in the energized state and no failure of switches is determined while the electric device is in the non-energized state.
›3.↳ 2The switch failure diagnosis device according to claim 2, wherein the switch terminal voltage detector includes an electric device-side voltage detect…d3
The switch failure diagnosis device according to claim 2, wherein the switch terminal voltage detector includes an electric device-side voltage detector portion configured to output an electric device-side voltage detection signal corresponding to an electric device-side voltage that is a voltage between the electric device and the switches, andnwherein the controller is further configured to:ninput the open instruction signal to the switch if the electric device is determined to be in the non-energized state;determine the electric device-side voltage based on the electric device-side voltage detection signal while the open instruction signal is given to the switch; anddetermine that there is no failure of switch if the electric device-side voltage is equal to or higher than a failure determination threshold.
›4.↳ 1The switch failure diagnosis device according to claim 1, wherein the switch terminal voltage detector includes an electric device-side voltage detect…d2
The switch failure diagnosis device according to claim 1, wherein the switch terminal voltage detector includes an electric device-side voltage detector portion and an electric storage device-side voltage detector portion, the electric device-side voltage detector portion being configured to output an electric device-side voltage detection signal corresponding to an electric device-side voltage that is a voltage between the electric device and the switches, the electric storage device-side voltage detector portion being configured to output an electric storage device-side voltage detection signal corresponding to an electric storage device-side voltage that is a terminal voltage of the electric storage device, andnwherein the controller is further configured to determine whether at least one of the switches has a failure based on a difference between the electric device-side detection signal and the electric storage device-side detection signal.
›5.↳ 1The switch failure diagnosis device according to claim 1, wherein the controller is further configured to:nhalt the input of the open instruction sign…d2
The switch failure diagnosis device according to claim 1, wherein the controller is further configured to:nhalt the input of the open instruction signal to the switches without inputting the open instruction signal to an N+1th switch if at least one of the switches is determined to have a failure; andselect the N+1th switch and input the open instruction signal to the N+1 th switch if no failure of switches is determined,where N refers to a positive integer equal to or larger than 1.
›6.↳ 1The switch failure diagnosis device according to claim 1, wherein the controller is further configured to:ndetermine whether a continue condition is s…d2
The switch failure diagnosis device according to claim 1, wherein the controller is further configured to:ndetermine whether a continue condition is satisfied; andrepeat the selecting of the switches and the inputting of the open instruction signal from the first switch if the continue condition is determined as not satisfied during the inputs of the open instruction signals to the switches.
›7.↳ 1The switch failure diagnosis device according to claim 1, wherein the current path comprises a plurality of current paths provided with the plurality …d2
The switch failure diagnosis device according to claim 1, wherein the current path comprises a plurality of current paths provided with the plurality of switches, respectively,nwherein the plurality of current paths comprises common connection points on an upstream side of the switches and on a downstream side of the switches, respectively, andwherein the current paths have substantially the same resistance.
›8.↳ 1An electric storage apparatus, comprising:nan electric storage device; andthe switch failure diagnosis device according to claim 1.d2
An electric storage apparatus, comprising:nan electric storage device; andthe switch failure diagnosis device according to claim 1.
›9.↳ 1The switch failure diagnosis device according to claim 1, wherein the electric device comprises at least one of a charger and a load.d2
The switch failure diagnosis device according to claim 1, wherein the electric device comprises at least one of a charger and a load.
›10.↳ 1The switch failure diagnosis device according to claim 1, wherein the switches are configured to change a state of the current path between a non-ener…d2
The switch failure diagnosis device according to claim 1, wherein the switches are configured to change a state of the current path between a non-energized state and an energized state.
›11.↳ 1The switch failure diagnosis device according to claim 1, wherein the switches comprise contact relays.d2
The switch failure diagnosis device according to claim 1, wherein the switches comprise contact relays.
›12.↳ 1The switch failure diagnosis device according to claim 1, wherein the switches comprise semiconductor switches.d2
The switch failure diagnosis device according to claim 1, wherein the switches comprise semiconductor switches.
›13.↳ 1The switch failure diagnosis device according to claim 1, wherein the switches comprise normally-closed type switches.d2
The switch failure diagnosis device according to claim 1, wherein the switches comprise normally-closed type switches.
›14.↳ 1The switch failure diagnosis device according to claim 1, wherein the switch failure diagnosis device is configured for a vehicle.d2
The switch failure diagnosis device according to claim 1, wherein the switch failure diagnosis device is configured for a vehicle.
›15.↳ 1The switch failure diagnosis device according to claim 1, wherein, when the switch failure diagnosis device is turned on, the controller is configured…d2
The switch failure diagnosis device according to claim 1, wherein, when the switch failure diagnosis device is turned on, the controller is configured to select the switches.
›16.↳ 1The switch failure diagnosis device according to claim 1, wherein the controller is further configured to:ndetermine whether the electric device is in…d2
The switch failure diagnosis device according to claim 1, wherein the controller is further configured to:ndetermine whether the electric device is in an energized state or a non-energized state; andinput the open instruction signal to the switch and determine whether at least one of the switches has a failure if the electric device is determined to be in the energized state and no failure of switches is determined while the electric device is in the non-energized state.
›17.↳ 1The switch failure diagnosis device according to claim 1, wherein the controller is further configured to:ndetermine whether at least one of the switc…d2
The switch failure diagnosis device according to claim 1, wherein the controller is further configured to:ndetermine whether at least one of the switches has a failure if the electric device is determined to be in a non-energized state; andinput the open instruction signal to the switch and determine whether at least one of the switches has a failure if the electric device is determined to be in an energized state and no failure of switches is determined while the electric device is in the non-energized state.
›18.↳ 1The switch failure diagnosis device according to claim 1, wherein the switch terminal voltage detector includes an electric device-side voltage detect…d2
The switch failure diagnosis device according to claim 1, wherein the switch terminal voltage detector includes an electric device-side voltage detector portion and an electric storage device-side voltage detector portion, the electric device-side voltage detector portion being configured to output an electric device-side voltage detection signal corresponding to an electric device-side voltage that is a voltage between the electric device and the switches, the electric storage device-side voltage detector portion being configured to output an electric storage device-side voltage detection signal corresponding to an electric storage device-side voltage that is a terminal voltage of the electric storage device.
›19.↳ 1The switch failure diagnosis device according to claim 1, wherein the controller is configured to determine whether the failure of the at least one of…d2
The switch failure diagnosis device according to claim 1, wherein the controller is configured to determine whether the failure of the at least one of the switches exists without shutting off the current path between the electric storage device and the electric device.
