JP2013188068A - Energy storage system, and charge control device and failure detection method for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve safe and rapid failure detection for a charging relay of a DC boosting charge system.SOLUTION: An energy storage system having an energy storage device for supplying electric power as a travel power source for a vehicle includes: a connection section connected with a charge cable of a DC power supply outside the vehicle; a first charge relay and a second charge relay, which are installed on respective charge lines for connecting the connection section with each of a positive terminal and a negative terminal of the energy storage device to permit connection between the connection section and the energy storage device; and a controller that performs first failure detection for detecting failure states of the first charge relay and the second charge relay with the charge cable connected with the connection section after completion of charging using the DC power supply and second failure detection for detecting failure states of the first charge relay and second charge relay during a vehicle travel.

Description

  The present invention relates to charging control of a vehicle equipped with a secondary battery or the like as a power source, and more particularly to detection of abnormality of a charging relay for an external power source.

  For example, a plug-in hybrid vehicle and an electric vehicle can charge a secondary battery mounted from an external power source, and a charging inlet connected to a charging cable of the external power source is provided in the vehicle.

  The charging inlet is a connecting portion that is electrically connected to a secondary battery that is a power source of the vehicle and supplies power from the external power source to the secondary battery. When connecting to a charging cable extending from the external power source, gasoline or the like It can be touched by the user in the same manner as the refueling port. For this reason, it is necessary to prevent the electrode portion of the charging inlet from being exposed to the outside while being electrically connected to the secondary battery.

JP 2009-136110 A

  External charging is performed by connecting a charging cable to a household outlet and connecting the charging cable to an ordinary AC charging unit that uses a commercial power source as an external power source, and an external power source that can supply direct current such as a DC charging stand. And fast charge (DC fast charge).

  In the case of AC charging, for example, charging is performed by converting alternating current into direct current through a charger mounted on a vehicle, and therefore, charging cable is provided by structural insulation of AC / DC conversion energy transmission provided in the charger. When the battery is removed, the high voltage of the secondary battery can be prevented from being exposed to the electrode portion of the charging inlet by stopping the charger.

  However, in the case of DC rapid charging, charging is performed with a direct current supplied directly from a DC charging stand, so it is necessary to provide a charging relay between the charging inlet and the secondary battery. The battery is electrically disconnected. For this reason, when abnormality (for example, welding) of a charging relay arises, there exists a possibility that the high voltage of a secondary battery may be exposed to the electrode part of a charging inlet.

  For this reason, in the case of the DC quick charging system, it is necessary to quickly detect the abnormality of the charging relay while ensuring safety. However, in Patent Document 1, when the abnormality of the charging relay is detected, the lid of the charging lid is opened. Although it can be locked to prevent the charging inlet from being exposed to the outside, if the open / close lid is not closed, the charging relay cannot be abnormal, and the charging relay can be detected safely and quickly in the DC quick charging system. There is no description. Further, there is no description about a safe and quick detection method when detecting abnormality individually for each charging relay in the DC quick charging system.

  A power storage system including a power storage device that supplies electric power as a driving power source for a vehicle according to the first aspect of the present invention includes a connection portion connected to a charging cable of a DC power source outside the vehicle, and a positive terminal and a negative terminal of the power storage device, respectively. A first charging line and a second charging line that connect the connecting portion and the first charging relay and the second charging relay that allow connection between the connecting portion and the power storage device, And a controller for detecting an abnormal state of the charging relay and the second charging relay. The controller performs a first abnormality detection for detecting an abnormal state of the first charging relay and the second charging relay after the charging by the DC power source is finished and the charging cable is connected to the connection portion, and while the vehicle is running Second abnormality detection is performed to detect abnormal states of the first charging relay and the second charging relay.

  According to the first invention of the present application, the abnormality of the charging relay is detected at the timing when the connecting portion is not exposed to the outside, that is, the charging cable is connected to the connecting portion, and the charging cable is not connected to the connecting portion. Therefore, the connection part may be exposed to the outside, but the abnormality of the charging relay is detected while the vehicle is running that the user cannot touch, so that the abnormality of the charging relay can be detected quickly while ensuring safety. It can be carried out.

  The first abnormality detection is performed based on a change in voltage applied to the connection portion when the first charging relay and the second charging relay are turned off in a state where the charging cable is connected to the connection portion. And whether the second charging relay is in an abnormal state, and the second abnormality detection is performed when only one charging relay is turned off while the power storage device can supply power as a driving power source of the vehicle. Whether or not the other charging relay is in an abnormal state can be detected based on the change in the voltage applied to the connecting portion.

  The controller can perform the second abnormality detection during the most recent vehicle travel after completion of charging by the DC power source. In this case, even if each charging relay has no abnormality in the first abnormality detection, the abnormality of each charging relay can be detected individually in the second abnormality detection during the latest vehicle traveling, so that the safety can be ensured while ensuring safety. In addition, the abnormality of the charging relay can be detected.

  The controller can perform the second abnormality detection while the vehicle is running when the first abnormality detection is unprocessed or interrupted. When the first abnormality detection is unprocessed or interrupted, the second abnormality detection is always performed while the vehicle is traveling, so that the abnormality detection of the charging relay can be performed accurately and quickly.

  The abnormality detection device according to the second invention of the present application is a power storage device that supplies electric power as a driving power source of a vehicle, a connection portion that is connected to a charging cable of a DC power supply outside the vehicle, and a positive terminal and a negative terminal of the power storage device, respectively. And a first charging relay and a second charging relay that are provided in each charging line that connects the connection unit and allows the connection between the connection unit and the power storage device. The abnormality detection device performs a first abnormality detection for detecting an abnormal state of the first charging relay and the second charging relay in a state where the charging cable is connected to the connection portion after the charging by the DC power source is completed, and the vehicle travels A second abnormality detection is performed to detect an abnormal state of the first charging relay and the second charging relay. As with the first invention of the present application, it is possible to quickly detect the abnormality of the charging relay while ensuring safety.

  A charging control device for a power storage device that supplies electric power as a driving power source for a vehicle according to a third invention of the present application is such that when a charging cable of a DC power supply outside the vehicle is connected to a connection portion provided in the vehicle, The first charging relay and the second charging relay that allow connection between the positive terminal and the negative terminal through the respective charging lines are switched on to charge the power storage device with the DC power of the DC power supply. The charging control device performs first abnormality detection that detects an abnormal state of the first charging relay and the second charging relay in a state where the charging cable is connected to the connecting portion after the charging by the DC power source is completed, An abnormal state of the first charging relay and the second charging relay is detected while the vehicle is traveling. As with the first invention of the present application, it is possible to quickly detect the abnormality of the charging relay while ensuring safety.

  The fourth invention of the present application is a power storage device that supplies electric power as a driving power source of a vehicle, a connection portion that connects to a charging cable of a DC power supply outside the vehicle, and a connection portion that connects each of the positive electrode terminal and the negative electrode terminal of the power storage device. An abnormality detection method for a power storage system, which is provided in each charging line and includes a first charging relay and a second charging relay that allow a connection between the connecting portion and the power storage device, after charging by a DC power source is completed And a step of performing a first abnormality detection for detecting an abnormal state of the first charging relay and the second charging relay in a state where the charging cable is connected to the connecting portion, and the first charging relay and the second charging during vehicle traveling. Performing a second abnormality detection for detecting an abnormal state of the relay. As with the first invention of the present application, it is possible to quickly detect the abnormality of the charging relay while ensuring safety.

It is a side view of the vehicle carrying a DC quick charge system. It is a figure which shows an example of a charge lid. It is a figure which shows an example of the battery system containing DC quick charge system. It is a figure explaining the abnormality detection process of a charging relay. It is a figure which shows the processing flow of the abnormality detection process of a charging relay. It is a figure which shows the processing flow of a both-side welding detection process. It is a figure which shows the processing flow of a one-side welding detection process. It is a figure which shows the modification of the abnormality detection process of a charging relay. It is a figure which shows the modification of a both-side welding detection process. It is a figure which shows the modification of the battery system containing DC quick charge system.

  Examples of the present invention will be described below.

Example 1
A charging control for a vehicle equipped with a battery system (corresponding to a power storage system) that is Embodiment 1 of the present invention will be described. FIG. 1 is a side view of a vehicle 100 equipped with a battery system. Examples of the vehicle 100 include a hybrid vehicle and an electric vehicle. The hybrid vehicle includes an engine or a fuel cell as a power source for running the vehicle, in addition to the assembled battery described later. An electric vehicle includes only an assembled battery as a power source for the vehicle.

  As shown in FIG. 1, a charging lid 120 for charging power supplied from an external power source is provided on the front side surface of the vehicle main body 110. The charging lid 120 can be provided at an arbitrary position such as a rear side surface of the vehicle main body 110 or a front front surface.

  The charging lid 120 accommodates a charging inlet 122 (corresponding to a connecting portion) connected to a charging cable connector extending from an external power source, and the lid 121 is opened to connect the charging cable connector to the charging inlet 122. The charging inlet 122 can be covered by closing the lid 121.

  FIG. 2 is a diagram showing the charging lid 120. Charging lid 120 includes a concave accommodating portion 124 formed on the outer surface of vehicle body 110, and charging inlet 122 is accommodated in accommodating portion 124. The charging inlet 122 is provided with a connection switch 123, the connection switch 123 is turned on in a state where the connector of the charging cable is connected to the charging inlet 122, and is turned off when the connector of the charging cable is removed from the charging inlet 122. .

  The lid part 121 is rotatably supported by the support part 125, and closes or opens the accommodating part 124 by its rotation. The lid 121 is provided with a lock device 126. The lock device 126 fixes the lid 121 in the closed state.

  FIG. 3 is a diagram showing the configuration of the battery system of this example. The battery system according to this embodiment includes a DC quick charging system including a charging inlet 122.

  The assembled battery 10 (corresponding to a power storage device) has a plurality of unit cells 11 connected in series. As the cell 11, a secondary battery such as a nickel metal hydride battery or a lithium ion battery can be used. An electric double layer capacitor (capacitor) can be used instead of the secondary battery. The number of the single cells 11 constituting the assembled battery 10 can be set as appropriate based on the required output. The assembled battery 10 may include a plurality of unit cells 11 connected in parallel.

  The assembled battery 10 is connected to the inverter 41 via the positive electrode line PL and the negative electrode line NL. System main relay SMR-B is provided on positive line PL between the positive terminal of battery pack 10 and inverter 41, and system main relay SMR is provided on negative line NL between the negative terminal of battery pack 10 and inverter 41. -G is provided.

  A system main relay SMR-P and a current limiting resistor R connected in parallel to the system main relay SMR-G are connected, and the system main relay SMR-P and the current limiting resistor R are connected in series. System main relays SMR-B, SMR-G, and SMR-P allow connection with a load, which will be described later, and receive a control signal from controller 50 between ON (connected state) and OFF (cut-off state). Switch.

  When the ignition switch is turned on, the controller 50 turns on the system main relays SMR-B and SMR-P, passes a current through the current limiting resistor R, turns on the system main relay SMR-G, and then turns on the system main relay. The battery pack 10 and the inverter 41 are connected by turning off the SMR-P.

  The inverter 41 converts the DC power output from the assembled battery 10 into AC power and outputs the AC power to the motor generator (MG) 42. For example, a three-phase AC motor can be used as the motor / generator 42. Further, the inverter 41 can convert the AC power output from the motor / generator 42 into DC power and output the DC power to the assembled battery 10.

  The motor / generator 42 receives AC power from the inverter 41 and generates kinetic energy for running the vehicle. The motor / generator 42 is connected to the wheels, and the kinetic energy generated by the motor / generator 42 is transmitted to the wheels. When the vehicle is decelerated or stopped, the motor / generator 42 converts kinetic energy generated during braking of the vehicle into electric energy (AC power). The AC power generated by the motor / generator 42 is output to the inverter 41. Thereby, regenerative electric power can be stored in the assembled battery 10. In the battery system of this embodiment, the motor / generator 42 can be used as a load that operates by receiving electric power from the assembled battery 10.

  Further, a boost converter may be provided between the assembled battery 10 and the inverter 41. In this case, the boost converter boosts the output voltage of the assembled battery 10 and outputs the boosted power to the inverter 41. Further, the boost converter can step down the output voltage of the inverter 41 and output the stepped down power to the assembled battery 10. The step-up converter can be composed of a chopper circuit, for example.

  The voltage sensor 20 is connected to the positive electrode line PL and the negative electrode line NL, detects the voltage between the terminals of the assembled battery 10, and outputs the detection result to the controller 50. Further, the voltage sensor 20 may be configured to detect the voltage of each of the unit cells 11 connected in series constituting the assembled battery 10.

  The current sensor 21 is provided on the positive electrode line PL, detects a charging / discharging current of the assembled battery 10 that performs charging / discharging, and outputs a detection result to the controller 50. For example, when the battery pack 10 is being discharged, a positive value can be used as the current value detected by the current sensor 21. Further, when the battery pack 10 is being charged, a negative value can be used as the current value detected by the current sensor 21. Note that the current sensor 21 may be provided on the negative electrode line NL.

  The current sensor 21 detects a charging current from an external power source that flows to the assembled battery 10 through the inlet 60 and outputs a detection result to the controller 50. The current sensor 21 of this embodiment is provided in the current path of the charging current that is output from the inlet 60 to the assembled battery 10. A current sensor that detects a charging current from an external power source that flows to the assembled battery 10 via the inlet 60 and a current sensor that detects a current that flows through the assembled battery 10 in charge / discharge control of the assembled battery 10 are individually provided. Alternatively, the current may be detected separately.

  Capacitor 22 is connected to positive electrode line PL and negative electrode line NL, and smoothes voltage fluctuations between positive electrode line PL and negative electrode line NL.

  The inlet 60 is the charging inlet 122 shown in FIG. 2, and is a vehicle-side charging connector that connects to the connection connector 73 of the charging cable 72 that extends from the external power supply 70.

  The inlet 60 is connected to the assembled battery 10 via the charging line PL1 and the charging line NL1, and the charging line PL1 is connected to the positive electrode line PL between the system main relay SMR-B and the inverter 41. The charging line NL1 is connected to the negative electrode line NL between the system main relay SMR-G and the inverter 41.

  Charging relay DCR-B is provided on charging line PL1, and charging relay DCR-G is provided on charging line NL1. The charging relays DCR-B and DCR-G allow connection between the inlet 60 and the assembled battery 10 and receive a control signal from the controller 50 to turn it on (connected state) and off (cut off state). Switch.

  The voltage sensor 61 detects the voltage applied to the inlet 60 and outputs the detection result to the controller 50. Voltage sensor 61 is connected to charging line PL1 and charging line NL1 between inlet 60 and charging relays DCR-B and DCR-G.

  The battery system of the present embodiment is configured to include a DC quick charging system including an inlet 60, charging lines PL1 and NL1, and charging relays DCR-B and DCR-G. In other words, the DC power input from the external power supply 70 to the charging lines PL1 and NL1 directly from the external power supply 70 via the inlet 60 is not directly connected to a household power outlet and the commercial power supply is used as an external power supply. A DC rapid charging system for charging the battery pack 10 is included. In addition, the battery system of a present Example may be provided with both DC quick charge system and AC charge system which included AC charge system separately.

  Inlet 60 is a DC connector, is connected to charging cable 72 and is connected to battery pack 10 via charging lines PL1 and NL1. The charging cable 72 and the connection connector 73 are also constituted by a DC charging cable and connector.

  A charging cable 72 connected to the inlet 60 is connected to an external power source 70. The external power source 70 is a DC charging stand. The DC charging stand is a direct current power source provided exclusively for charging the assembled battery 10 mounted on the vehicle 100 at high speed. The DC charging stand converts electric power supplied from a normal power line or electric power generated using natural energy by a solar power generation device into direct-current power that can be directly charged into the assembled battery 10, and a charging cable 72 is connected. Supplied to the vehicle 100.

  The DC charging stand has a larger allowable current value than an outlet of a commercial power supply (AC100, AC200, etc.), and can output a charging current larger than that of AC charging to the assembled battery 10, so that the charging time is shortened.

  The DC charging stand (external power source 70) includes a charger 71. The charger 71 boosts DC power output from an AC / DC converter (not shown) or an AC / DC converter that converts AC power supplied from a normal power line into DC power, and outputs the boosted DC / DC power to the assembled battery 10. A DC converter or the like can be included.

  The controller 50 is a control device that performs charge control for charging the assembled battery 10 with DC power from the external power supply 70. The charging cable 72 and the connection connector 73 are provided with a communication line. When the connection connector 73 is connected to the inlet 60, the controller 50 can output a control signal to the charger 71 of the external power source 70. it can.

  Further, the controller 50 functions as an abnormality detection device that performs abnormality detection processing of the charging relays DCR-B and DCR-G. It should be noted that the abnormality detection process of the charging relay can be configured by a control device separate from the controller 50. Further, charge / discharge control of the assembled battery 10 (discharge control for outputting the power of the assembled battery 10 to a load based on a vehicle output request, regenerative power at the time of vehicle braking when the vehicle decelerates or stops) 10 may be configured to perform the charge control and the charge relay abnormality detection process performed by the controller 50 of the present embodiment.

  FIG. 4 is a diagram for explaining the external charge control and the abnormality detection process for the charge relays DCR-B and DCR-G according to the present embodiment. The external charge control is composed of three controls: a start sequence, a DC charge sequence, and an end sequence.

  When the controller 50 detects that the charging cable 72 extended from the external power supply 70 is connected to the inlet 60, the controller 50 starts external charging for directly charging the assembled battery 10 with the DC power from the external power supply 70. The controller 50 detects that the connection switch 123 is turned on because the connection switch 123 is turned on when the connection connector 73 is connected to the inlet 60 (charging inlet 122) as shown in FIG. Thus, it can be detected that the connection connector 73 is connected to the inlet 60.

  When the charging cable 72 is connected to the inlet 60, the controller 50 performs an external charging control start sequence. As a start sequence, the controller 50 confirms the connection with the charger 71 of the external power supply 70 and turns on the charging relays DCR-B and DCR-G to connect the inlet 60 and the assembled battery 10. At this time, system main relays SMR-B and SMR-G are on, and SMR-P is off.

  When the start sequence is completed normally, the controller 50 performs the DC charging sequence. The DC charging sequence is a control that outputs a control signal to the charger 71 to charge the battery pack 10 with DC power based on the SOC (charging state), charging time, and charging current detected during charging of the battery pack 10. It is.

  The charger 71 operates based on the control signal output from the controller 50 and controls the charging current. The controller 50 integrates the DC charging current value output from the external power source 70 (charger 71) detected by the current sensor 21 to the assembled battery 10 from the start to the end of charging (during charging) to obtain the charging current integrated value. It can also be calculated.

  When the SOC of the battery pack 10 reaches a predetermined SOC in the DC charging sequence, the controller 50 ends the supply of DC power from the external power supply 70 to the battery pack 10, and proceeds to the end sequence to control charging from the external power supply 70. End.

  In the termination sequence, the controller 50 turns off the charging relays DCR-B and DCR-G, and disconnects the inlet 60 and the assembled battery 10 from each other. The system main relays SMR-B and SMR-G are also turned from on to off, and the system main relays SMR-B, the system main relays SMR-G and SMR-P including the charging relays DCR-B and DCR-G are all turned off. To do. In the end sequence, for example, calculation processing and storage processing can also be performed, and SOC, full charge capacity, and the like are calculated. You can also memorize it.

  The charging cable 72 is connected to the inlet 60 until the connection connector 73 is removed from the inlet 60 after the connection connector 73 is connected to the inlet 60, that is, from the start sequence to the end sequence of the external charging control. Is in a connected state (connected).

  In the present embodiment, the charging relays DCR-B and DCR-G are used in an end sequence after the supply of DC power from the external power source 70 to the assembled battery 10 is completed, that is, in an end sequence after the charging of the assembled battery 10 is completed. The first abnormality detection process is performed. The first abnormality detection process is double-sided welding detection for detecting whether the two charging relays DCR-B and DCR-G are both welded (simultaneously).

  Since the charging cable 72 is connected to the inlet 60 (being connected) during the termination sequence as described above, the user or the like contacts the inlet 60 without exposing the inlet 60 to the outside. Thus, the abnormality detection (diagnosis) of the charging relays DCR-B and DCR-G can be performed.

  That is, after the termination sequence, the charging cable 72 is removed from the inlet 60, so that the charging cable 72 before the inlet 60 is exposed to the outside is connected to the inlet 60 (timing when the inlet 60 is not exposed to the outside). By detecting both-side welding, whether or not the high voltage of the assembled battery 10 is exposed through the inlet 60 while ensuring safety (whether the charging relays DCR-B and DCR-G are welded together) can be quickly determined. Can be detected.

  When the first abnormality detection process ends normally, the controller 50 notifies the end of external charging by the external power supply 70, and also blinks the lamp and outputs a message to the display screen that the charging cable 72 can be removed from the inlet 60. For example, the user is notified and the end sequence ends.

  Further, in the present embodiment, the first abnormality detection process after the charging of the assembled battery 10 is completed and the second abnormality detection process of the charging relays DCR-B and DCR-G is performed while the vehicle is running after the battery system is activated. . The second abnormality detection process is a process for detecting which of the two charging relays DCR-B and DCR-G is welded, which cannot be detected by the both-side welding detection of the first abnormality detection process.

  In this embodiment, the second abnormality detection process is performed while the vehicle is running, so that it is quickly detected which of the charging relays DCR-B and DCR-G is welded while ensuring safety.

  Specifically, when the ignition switch is switched from OFF to ON, the system main relays SMR-B and SMR-G are switched from OFF to ON, the assembled battery 10 and the inverter 41 are connected, and the assembled battery 10 is charged / discharged. It becomes a possible state (a state where the assembled battery 10 can supply power to the load as a driving power source of the vehicle). At this time, the charging cable 72 is disconnected from the inlet 60.

  If the second abnormality detection process is performed in a state where the charging cable 72 is disconnected from the inlet 60, the high voltage of the assembled battery 10 may be exposed through the inlet 60, and safety cannot be sufficiently ensured. For example, even when one charging relay is abnormal and the other is abnormal, it is determined that the high voltage of the assembled battery 10 is not exposed through the inlet 60 (no abnormality) in both-side welding detection. When the second abnormality detection process is performed in this state, the high voltage of the assembled battery 10 may be exposed through the inlet 60.

  The second abnormality detection process is performed at the time of the next battery system activation after the end of external charging, that is, when the battery system is activated for the first time after the first abnormality detection process, thereby quickly detecting an abnormality in the charging relay. However, when the vehicle is stopped after the battery system is started when the ignition switch is switched from OFF to ON, the lid portion 121 of the charging lid 120 may be opened and the inlet 60 may be exposed.

  Therefore, in the present embodiment, the second abnormality detection process is performed in such a manner that the user cannot touch the inlet 60 while avoiding the period in which the lid portion 121 of the charging lid 120 is opened and the inlet 60 may be exposed. Charging relays DCR-B, DCR-G quickly while ensuring safety by performing the operation in the middle (for example, detecting that the vehicle is traveling from a speedometer and traveling at a vehicle speed of a predetermined value or more). It is possible to detect which is welded. In particular, even when the first battery system is started after the first abnormality detection process, the second abnormality detection process can be performed quickly while ensuring safety.

  FIG. 5 is a diagram illustrating a processing flow of the abnormality detection processing according to the present embodiment. The abnormality detection process is performed by the controller 50. The controller 50 determines whether the charging cable 72 is connected to the inlet 60 in an end sequence after the supply of the DC power from the external power source 70 to the assembled battery 10 is ended (S101). ).

  When the controller 50 determines that the end sequence is in a state where the charging cable 72 is connected to the inlet 60, the controller 50 performs a first abnormality detection process. In order to perform the first abnormality detection process, the controller 50 turns off the charging relays DCR-B and DCR-G, turns on the system main relays SMR-B and SMR-G, and turns off the system main relay SMR-P. Then, the first abnormality detection process is started (S102).

  If it is determined in step S101 that the sequence is not the external charge control end sequence or the connection connector 73 is not connected to the inlet 60, the process proceeds to step S103, where the vehicle speed acquired from the vehicle speed meter is a predetermined value (for example, It is determined whether the vehicle speed is greater than 0), in other words, whether the vehicle is traveling.

  If it is determined in step 103 that the vehicle is traveling, the controller 50 proceeds to step S104 and starts the second abnormality detection process. In order to perform the second abnormality detection process, the controller 50 confirms that the charging relays DCR-B and DCR-G are off and the system main relays SMR-B and SMR-G are on, Start the abnormality detection process. Since the second abnormality detection process is performed after the battery system is activated, system main relays SMR-B and SMR-G are in the on state.

  When it is detected that both charging relays DCR-B and DCR-G have no abnormality (the high voltage of the assembled battery 10 is not exposed through the inlet 60) in both-side welding detection in step S102 (S105), the controller 50 performs step S107. Then, a predetermined normality determination process is performed. When the abnormality of the charging relays DCR-B and DCR-G at which the high voltage of the assembled battery 10 is exposed through the inlet 60 in step S102 is detected (S105), the controller 50 proceeds to step S106 and performs a predetermined abnormality determination process. Do.

  On the other hand, if no abnormality is detected in the charging relays DCR-B and DCR-G in the one-side welding detection in step S104, the process proceeds to step S107 to perform a predetermined normality determination process. In step S104, either one or both charging is performed. When an abnormality is detected in the relays DCR-B and DCR-G, the process proceeds to step S106, and predetermined abnormality determination processing is similarly performed.

FIG. 6 is a diagram illustrating a process flow of the first abnormality detection process (S102 in FIG. 5) of the present embodiment. The controller 50 confirms that the charging relays DCR-B and DCR-G and the system main relays SMR-B and SMR-G are in the ON state, and acquires the voltage _VDC applied to the inlet 60 from the voltage sensor 61. (S301). The detection voltage V _{DC at} this time is a voltage between terminals of the assembled battery 10 because the charging relays DCR-B and DCR-G and the system main relays SMR-B and SMR-G are in an on state.

After acquiring voltage _VDC , controller 50 switches both charging relays DCR-B and DCR-G from on to off (S302).

When the detected voltage V _DC of the voltage sensor 61 after switching both the charging relays DCR-B and DCR-G from on to off in step S302 is the voltage _VL (V _DC = V _L ), It is determined that both charging relays DCR-B and DCR-G in the off state are not welded (simultaneously) (YES in S303, S305), and the detection voltage V _DC of the voltage sensor 61 is the voltage _VL. If not (V _DC ≠ V _L ), the voltage applied to the inlet 60 fluctuates despite being in the OFF state, so both charging relays DCR-B and DCR-G are welded together. It is determined that the state is abnormal (NO in S303, S305). Here, the voltage _VL can be set to 0V. That is, when both charging relays DCR-B and DCR-G are in the off state, the detection voltage V _DC of the voltage sensor 61 is 0V. Therefore, if the detected voltage V _DC of the voltage sensor 61 after switching both the charging relays DCR-B and DCR-G from on to off in step S302 is the voltage _VL (V _DC = 0), It can be determined that both charging relays DCR-B and DCR-G are in a normal state, and the detected voltage V _DC of the voltage sensor 61 is not the voltage V _L (V _DC ≠ 0, for example, the voltage sensor 61 If the detection voltage _{V DC} is the same as the terminal voltage of the battery pack 10), the charging relay DCR-B, is both charge relay DCR-G can be judged as abnormal state.

FIG. 7 is a diagram illustrating a process flow of the second abnormality detection process (S104 in FIG. 5) of the present embodiment. When starting the second abnormality detection process, each of the charging relays DCR-B and DCR-G is in an off state. The controller 50 acquires the voltage V _DC (for example, 0 V) applied to the inlet 60 from the voltage sensor 61 (S501). Since the battery system is activated when starting the second abnormality detection process, system main relays SMR-B and SMR-G are both in the on state.

  The second abnormality detection process shown in FIG. 7 is a state where the assembled battery 10 can supply power to the load as a driving power source of the vehicle 100 and only one charging relay is turned off while the vehicle 100 is traveling. This is a process for detecting whether or not the other charging relay is in an abnormal state based on a change in the voltage applied to the inlet 60.

After acquiring the voltage _VDC , the controller 50 checks whether or not both of the charging relays DCR-B and DCR-G are off, and if so, switches to the off state (S502).

Subsequently, in order to detect welding of the charging relay DCR-G, the controller 50 turns on the charging relay DCR-B (S503), and the voltage V _DC acquired from the voltage sensor 61 becomes the voltage V _H (V _H > 0) is determined (S504). When the detection voltage V _DC of the voltage sensor 61 is the voltage V _H (V _DC = V _H ), the controller 50 sets the voltage applied to the inlet 60 even though the charging relay DCR-G is in the off state. Since there is a fluctuation, it is determined that the charging relay DCR-G is abnormal (S505). Here, the voltage V _H is, for example, a voltage between terminals of the assembled battery 10.

On the other hand, if the voltage V _DC is not the voltage V _H in step S504 (V _DC ≠ V _H ), that is, if the voltage V _DC is 0 V, the controller 50 proceeds to step S506 and the charge relay DCR-B is abnormal. Perform detection.

In step S506, the controller 50 switches the charging relay DCR-B from the on state to the off state, and then switches the charging relay DCR-G from the off state to the on state (S507). The controller 50 determines whether or not the charging relay DCR-G is in the on state and the voltage V _DC acquired from the voltage sensor 61 is the voltage V _H (V _H > 0) (S508). When the detection voltage V _DC of the voltage sensor 61 is the voltage V _H (V _DC = V _H ), the controller 50 sets the voltage applied to the inlet 60 even though the charging relay DCR-B is off. Since there is a fluctuation, it is determined that the charging relay DCR-B is abnormal (S508).

In step S508, if the voltage V _DC is not the voltage V _H (V _DC ≠ V _H ), that is, if the voltage V _DC is 0 V, the controller 50 proceeds to step S509 and the charging relays DCR-B, DCR-G. Are not in an abnormal state.

  In the present embodiment, one-side welding detection of the charging relay is performed during traveling of the vehicle in which the user cannot touch the inlet 60 while avoiding the period when the lid portion 121 of the charging lid 120 is opened and the inlet 60 may be exposed. Therefore, it is possible to quickly detect which of the charging relays DCR-B and DCR-G is welded while ensuring safety. In particular, one-side welding detection of the charging relay is performed while the vehicle is running after starting the first (most recent) battery system after detecting both-side welding in external charging control. It is possible to quickly detect whether there is an abnormality.

  That is, the abnormality detection of the charging relay of the present embodiment performs the abnormality detection (both-side welding detection) of the charging relay at the timing when the inlet 60 is not exposed to the outside, that is, the state where the charging cable 72 is connected to the inlet 60. Although the charging cable 72 is not connected to the inlet 60, the inlet 60 may be exposed to the outside, but the charging relay abnormality detection (one-sided welding detection) is performed while the vehicle is not touchable by the user. Therefore, it is possible to quickly detect the abnormality of the charging relay while ensuring safety.

  In addition, since both-side welding detection is performed in a state where the inlet 60 is not exposed to the outside, that is, when the charging cable 72 is connected to the inlet 60 and the inlet 60 is not exposed to the outside, the height of the assembled battery 10 is increased via the inlet 60. Whether or not the high voltage of the assembled battery 10 is exposed through the inlet 60 after the charging cable 72 is removed from the inlet 60 while preventing the voltage from being exposed (whether the charging relay is abnormal). It can be detected quickly.

  For example, the assembled battery is connected via the inlet 60 in a state where the charging cable 72 during external charging is connected to the inlet 60 instead of in a specific environment where the inlet 60 is not exposed, such as the lid 121 of the charging lid being closed. Since it is possible to detect whether or not the high voltage of 10 is exposed, it is possible to appropriately detect abnormality of the charging relay that ensures safety.

  FIG. 8 is a modification of the abnormality detection process of the present embodiment shown in FIG. In the modified example shown in FIG. 8, when the first abnormality detection process has an error in the recent (most recent) external charge control before the battery system is activated (the process cannot be completed normally, there is an abnormality and The second abnormality detection process is performed when both determinations without abnormality can be performed, and the second abnormality detection process is not performed when the first abnormality detection process ends normally.

  As shown in FIG. 8, step S <b> 1031 is added to FIG. 5, and the controller 50 performs a second abnormality detection process during traveling of the vehicle when the first abnormality detection process has not ended normally. The other processes are the same as those in FIG.

  In step S1031, the controller 50 can determine whether or not the first abnormality detection process has ended normally based on ON / OFF of the error flag. FIG. 9 shows a modification of the first abnormality detection process of the present embodiment shown in FIG. 6 corresponding to the modification of FIG.

As shown in FIG. 9, steps S3011, S306, and S307 are added to FIG. In step S3011, for example, if the voltage V _DV acquired by the voltage sensor 61 is not smaller than a predetermined value, the controller 50 determines that the first abnormality detection process cannot be performed normally and cannot be normally terminated. In step S307, the error flag is turned ON. ON / OFF of the error flag can be stored in a memory (not shown) or the like.

  On the other hand, if it is determined that the charging relays DCR-B and DCR-G are both abnormal or abnormal through step S304 or step S305, the controller 50 proceeds to step S306 and turns off the error flag in step S306. The other processes are the same as those in FIG.

  Note that step S3011 can also be configured to detect whether the charging cable 72 has been removed from the inlet 60 during the termination sequence. In this case, it is possible to determine whether or not the inlet 60 has been removed by monitoring the ON / OFF state of the connection switch 123.

  In this modified example of FIGS. 8 and 9, an error occurs in step S3011 if a condition that allows the first abnormality detection process to be normally performed (one of a plurality of conditions when there are a plurality of conditions) is not satisfied. The flag is turned ON, and the controller 50 performs the second abnormality detection process when the first abnormality detection process is interrupted with reference to ON / OFF of the error flag.

  Therefore, if the first abnormality detection process cannot be performed normally and the abnormality of the charging relay at the time of external charging cannot be detected, the second abnormality of the charging relay is surely detected while the vehicle is running after the most recent battery system activation. Since the process is performed, the abnormality of the charging relay can be detected quickly. In addition, since the second abnormality detection process is not performed when the first abnormality detection process is not interrupted, the efficiency of the process can be improved while quickly detecting the abnormality of the charging relay.

  Next, FIG. 10 is a modification of the battery system including the DC quick charge system shown in FIG. In FIG. 10, relays R1 and R2 are added to FIG. The relay R1 is provided on the charging line PL1 between the charging relay DCR-B and the positive terminal of the assembled battery 10. The relay R2 is provided on the charging line NL1 between the charging relay DCR-G and the negative terminal of the assembled battery 10.

  The relays R1 and R2 allow connection between the inlet 60 and the assembled battery 10 and switch between the on state and the off state, similarly to the charging relays DCR-B and DCR-G. Relays R1 and R2 are controlled by controller 50.

  The modification shown in FIG. 10 is performed via the charging lines PL1 and NL1 that cannot be blocked by the charging relays DCR-B and DCR-G that may be welded in the abnormality determination process (S106) of FIGS. It is an example which interrupts | blocks the connection of the inlet 60 and the assembled battery 10 by turning off relay R1, R2.

  For example, when it is determined that there is an abnormality in the first abnormality detection process, or when an abnormality is detected in the charging relay on both sides or one side in the second abnormality detection process, the controller 50 turns off the relays R1 and R2 in step S106. Thus, the connection between the inlet 60 and the assembled battery 10 via the charging lines PL1 and NL1 can be cut off, and high voltage exposure of the assembled battery 10 via the inlet 60 can be prevented.

  In the abnormality determination process when abnormality is detected in the first abnormality detection process, welding is performed by turning off the system main relays SMR-B and SMR-G in the battery system shown in FIG. The connection between the inlet 60 and the assembled battery 10 via the charging lines PL1 and NL1 that cannot be interrupted by the charging relays DCR-B and DCR-G that may be present may be interrupted. In this case, it is not necessary to provide the relays R1 and R2.

  Further, as another aspect of the abnormality determination process (S106) of FIGS. 5 and 8, the locking device 126 provided on the lid 121 of the charging lid 120 is operated to forcibly lock the lid 121. It is also possible not to open the lid 121 and to prevent the inlet 60 from being exposed to the outside. In this case, in the first abnormality detection process, when the charging cable 72 is removed from the inlet 60 and the lid 121 is closed, the controller 50 can operate the lock device 126 in the locked state. In the second abnormality detection process, since the lid 121 is in a closed state, the lock device 126 can be operated in the locked state so that the lid 121 cannot be opened.

10 assembled battery 11 cell 20 voltage sensor 21 current sensor 22 capacitor 41 inverter 42 motor generator 50 controller 60 (122) inlet 61 voltage sensor 70 external power supply (DC charging stand)
71 Charger 72 Charging Cable 73 Connector SMR-B, SMR-G, SMR-P System Main Relay DCR-B, DCR-G Charging Relay

Claims (7)

A power storage system including a power storage device that supplies power as a driving power source of a vehicle,
A connection for connecting to a DC power supply charging cable outside the vehicle;
A first charging line and a second charging line connecting the connecting portion with each of a positive electrode terminal and a negative electrode terminal of the power storage device;
A first charging relay and a second charging relay provided in each of the charging lines, allowing the connection between the connecting portion and the power storage device;
The first abnormality detection for detecting the abnormal state of the first charging relay and the second charging relay is performed in a state where the charging cable is connected to the connection portion after the charging by the DC power source is completed, and the vehicle is running A controller for performing second abnormality detection for detecting abnormal states of the first charging relay and the second charging relay;
A power storage system comprising: The first abnormality detection is based on a change in voltage applied to the connection portion when the first charging relay and the second charging relay are turned off in a state where the charging cable is connected to the connection portion. Detecting whether the first charging relay and the second charging relay are both in an abnormal state;
The second abnormality detection is based on a change in voltage applied to the connection portion when only one charging relay is turned off in a state where the power storage device can supply power as a driving power source of the vehicle. The power storage system according to claim 1, wherein it is detected whether or not the other charging relay is in an abnormal state.   3. The power storage system according to claim 1, wherein the controller performs the second abnormality detection during the most recent vehicle travel after the end of charging by the DC power source.   4. The controller according to claim 1, wherein the controller performs the second abnormality detection while the vehicle is running when the first abnormality detection is unprocessed or interrupted. 5. Power storage system. A power storage device that supplies electric power as a driving power source of the vehicle, a connection portion that connects to a charging cable of a DC power supply outside the vehicle, and each charging line that connects the positive electrode terminal and the negative electrode terminal of the power storage device to the connection portion. A first charge relay and a second charge relay that are provided and allow connection between the connection unit and the power storage device, an abnormality detection device for a power storage system,
The first abnormality detection for detecting the abnormal state of the first charging relay and the second charging relay is performed in a state where the charging cable is connected to the connection portion after the charging by the DC power source is completed, and the vehicle is running And performing a second abnormality detection for detecting an abnormal state of the first charging relay and the second charging relay. A charge control device for a power storage device that supplies electric power as a driving power source of a vehicle,
When a charging cable of a DC power supply external to the vehicle is connected to a connecting portion provided in the vehicle, a first terminal that allows connection between each of the positive terminal and the negative terminal of the power storage device and the connecting part via each charging line. Switching on the first charging relay and the second charging relay, charging the power storage device with the DC power of the DC power supply;
The first abnormality detection for detecting the abnormal state of the first charging relay and the second charging relay is performed in a state where the charging cable is connected to the connection portion after the charging by the DC power source is completed, and the vehicle is running And a second abnormality detection for detecting an abnormal state of the first charging relay and the second charging relay. A power storage device that supplies electric power as a driving power source of the vehicle, a connection portion that connects to a charging cable of a DC power supply outside the vehicle, and each charging line that connects the positive electrode terminal and the negative electrode terminal of the power storage device to the connection portion. A first charging relay and a second charging relay that are provided and allow connection between the connection unit and the power storage device, and a method for detecting an abnormality of the power storage system,
Performing a first abnormality detection for detecting an abnormal state of the first charging relay and the second charging relay in a state where the charging cable is connected to the connecting portion after the charging by the DC power source is completed;
Performing a second abnormality detection for detecting an abnormal state of the first charging relay and the second charging relay during traveling of the vehicle;
An abnormality detection method comprising:

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