JP2013128370A - Monitoring system and monitoring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform monitoring after specifying a vehicle state when monitoring a charge and discharge state of an electric power storage device.SOLUTION: This monitoring system comprises a controller (22) for monitoring the charge and discharge state corresponding to a traveling state and a stop state of the vehicle. The controller acquires control information for controlling system main relays (31 to 33) which permit and prohibit the charge and discharge of an electric power storage device (10), discriminates that the vehicle is in a traveling state when the system main relays are in states for permitting the charge and discharge of the electric power storage device, and when the system main relays are in states for prohibiting the charge and discharge of the electric power storage device, discriminates that the vehicle is in the stop state.

Description

  The present invention relates to a monitoring system and a monitoring method for monitoring a charge / discharge state of a power storage device.

  When controlling charging / discharging of the assembled battery, it is necessary to monitor the charging / discharging state of the assembled battery. The charge / discharge state of the assembled battery includes voltage and current in the assembled battery. The assembled battery may be mounted on the vehicle, and the vehicle can be driven using the energy output from the assembled battery, or the energy generated during braking of the vehicle (regenerative energy) can be stored in the assembled battery. .

JP 2000-209702 A JP 2005-168122 A JP 2000-194456 A JP 2007-267559 A JP 2007-327823 A

  When the assembled battery is mounted on a vehicle, it is preferable to change the method for monitoring the charge / discharge state of the assembled battery according to the state of the vehicle. Here, the battery monitoring device that monitors the charge / discharge state of the assembled battery does not grasp the state of the vehicle and performs only predetermined monitoring.

  1st invention of this application is a monitoring system which monitors the charging / discharging state of the electrical storage apparatus which outputs the energy for driving a vehicle, Comprising: The controller which monitors the charging / discharging state according to the driving | running state and stop state of a vehicle Have The controller acquires control information for controlling a system main relay that allows and prohibits charging and discharging of the power storage device, and determines that the vehicle is in a running state when the system main relay is in a state that allows charging and discharging of the power storage device. Then, when the system main relay is in a state of prohibiting charging / discharging of the power storage device, it is determined that the vehicle is in a stopped state.

  The power storage device can be composed of a plurality of power storage elements connected in series. Here, when the vehicle is in the running state, the voltages of the plurality of blocks included in the power storage device can be monitored. A block includes at least two power storage elements connected in series, and a power storage device is configured by connecting a plurality of blocks in series. On the other hand, when the vehicle is stopped, the voltage of each power storage element can be monitored.

  When the vehicle is in a running state, the input / output of the power storage device changes. For this reason, by monitoring the voltage of each block instead of the voltage of the power storage element, the charge / discharge state of the power storage device can be easily monitored while responding to changes in the input / output of the power storage device. On the other hand, when the vehicle is stopped, the input / output of the power storage device does not change. Therefore, by monitoring the voltage of each power storage element, the charge / discharge state of each power storage element can be accurately monitored.

  When the vehicle is in the external charging state, the charging state can be monitored according to the external charging state. The external charging state is a state in which power is supplied from the external power source to the power storage device. Here, it is possible to determine that the vehicle is in the external charging state when the control information for controlling the charging relay that allows and prohibits the power supply is acquired and the charging relay is in the state that allows the power supply. Thereby, it is possible to determine whether or not the vehicle is in the external charging state only by confirming the state (on / off) of the charging relay.

  When the vehicle is in an externally charged state, it is possible to monitor the voltage of the power storage element showing the highest voltage among the plurality of power storage elements constituting the power storage device. When charging the power storage device using electric power from an external power source, the power storage device can be charged efficiently by monitoring the voltage of the power storage element, particularly the highest voltage.

  When the vehicle is in a running state, the charge / discharge current of the power storage device can be monitored in the first detection range using a current sensor. Thereby, it becomes easy to monitor the current change according to the running of the vehicle. Further, when the vehicle is in the external charging state, the charging current of the power storage device can be monitored in the second detection range narrower than the first detection range using the current sensor. Thereby, the detection accuracy of the charging current can be improved.

  When the vehicle is in a running state, current detection in the first detection range is performed in the first cycle, and current detection in the second detection range that is narrower than the first detection range is performed in the second cycle that is longer than the first cycle. It can be carried out. When the vehicle is in a running state, current detection in a first detection range that is wider than the second detection range makes it easier to monitor current changes according to vehicle travel. Further, since the first period is shorter than the second period, current detection in the first detection range can be performed with priority.

  When the vehicle is in an externally charged state, current detection in the first detection range is performed in the third cycle, and current detection in the second detection range that is narrower than the first detection range is performed in the fourth cycle that is shorter than the third cycle. Can be done. When the vehicle is in the external charging state, the charging current of the power storage device can be accurately monitored by performing current detection in the second detection range. Moreover, an extreme change in the charging current can be monitored by performing current detection in the first detection range.

  A second invention of the present application is a monitoring system for monitoring the charge / discharge state of a power storage device that outputs energy for running a vehicle, and monitors the charge / discharge state according to the running state and stop state of the vehicle And a current sensor that outputs information related to the charge / discharge current of the power storage device to the controller. The controller determines that the vehicle is running when the charge / discharge current of the power storage device is changing, and determines that the vehicle is stopped when the charge / discharge current is not flowing through the power storage device. Thereby, it is possible to determine whether the vehicle is in a running state or a stopped state only by monitoring the charge / discharge current.

  Further, the controller can determine that the vehicle is in the external charging state when the charging current of the power storage device is maintained at a value larger than zero. Thereby, the state of the vehicle can be determined only by monitoring the charging current. When the vehicle is in the external charging state, the charging state can be monitored according to the external charging state.

  3rd invention of this application is the monitoring method which monitors the charging / discharging state of the electrical storage apparatus which outputs the energy for drive | working a vehicle. First, control information for controlling a system main relay that permits and prohibits charging and discharging of the power storage device is acquired. Here, when the system main relay is in a state in which charging / discharging of the power storage device is permitted, it is determined that the vehicle is in the traveling state, and the charge / discharge state is monitored according to the traveling state. Further, when the system main relay is in a state of prohibiting charging / discharging of the power storage device, it is determined that the vehicle is in a stopped state, and the charge / discharge state is monitored according to the stopped state.

  ADVANTAGE OF THE INVENTION According to this invention, when monitoring the electrical storage apparatus according to the state of a vehicle, the state of a vehicle can be specified by acquiring the control information which controls a system main relay.

It is a figure which shows the structure of the battery system which is Example 1. FIG. 4 is a flowchart illustrating processing when the vehicle is run or charged in the first embodiment. 5 is a flowchart illustrating processing when determining a state of a vehicle in the first embodiment. In Example 1, it is a flowchart which shows the process which sets the control mode according to the state of the vehicle. In Example 1, it is a flowchart which shows the monitoring process of the assembled battery according to the state of a vehicle. In Example 2, it is a flowchart which shows the monitoring process of the assembled battery according to the state of a vehicle. In Example 2, it is a figure which shows the use condition of the current sensor according to the state of the vehicle. In Example 3, it is a flowchart which shows the monitoring process of the assembled battery according to the state of a vehicle. In Example 3, it is a figure which shows the use condition of the current sensor according to the state of the vehicle. It is a figure which shows the structure of the battery system which is Example 4. FIG. In Example 5, it is a flowchart which shows the process when discriminating the state of a vehicle.

  Examples of the present invention will be described below.

  A battery system that is Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a diagram illustrating a configuration of a battery system. The battery system of this embodiment is mounted on a vehicle. Such vehicles include hybrid vehicles and electric vehicles.

  A hybrid vehicle is a vehicle provided with other power sources such as an internal combustion engine and a fuel cell in addition to the assembled battery as a power source for outputting energy used for traveling of the vehicle. An electric vehicle is a vehicle having only an assembled battery as a power source for the vehicle. In the vehicle of the present embodiment, the assembled battery can be charged by receiving power supply from an external power source.

  The battery system of this embodiment includes an assembled battery (corresponding to a power storage device) 10. The assembled battery 10 includes a plurality of single cells (corresponding to power storage elements) 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. Moreover, an electric double layer capacitor (capacitor) can be used instead of the secondary battery.

  The number of the cells 11 can be set as appropriate based on the required output. In the present embodiment, the plurality of single cells 11 are connected in series, but the plurality of single cells 11 connected in parallel may be included in the assembled battery 10.

  The battery monitoring device 20 monitors the charge / discharge state (voltage value or current value) of the assembled battery 10. The voltage detection circuit 21 included in the battery monitoring device 20 detects the voltage of each unit cell 11. The battery monitoring device 20 has two voltage detection circuits 21, and each voltage detection circuit 21 can detect a voltage of a battery block (referred to as a block voltage) included in the assembled battery 10. In the present embodiment, the assembled battery 10 is divided into two battery blocks, and each battery block includes a plurality of single cells 11 connected in series. The block voltage is the sum of the voltages (total voltage) in the plurality of unit cells 11 included in each battery block.

  In the present embodiment, the two voltage detection circuits 21 are provided and the voltages of the two battery blocks included in the assembled battery 10 are detected. However, the present invention is not limited to this. That is, the number of battery blocks can be set as appropriate. Here, each battery block only needs to include at least two unit cells 11 connected in series. The voltage detection circuit 21 can be provided as many as the number of battery blocks.

  The voltage detection circuit 21 detects the voltage of the corresponding battery block, or detects the voltage of each cell 11 included in the corresponding battery block. Here, the voltage detection circuit 21 operates in response to a control signal from the controller 22 included in the battery monitoring device 20. The detection information of the voltage detection circuit 21 is output to the controller 22.

  The current sensor 23 detects the charge / discharge current flowing through the assembled battery 10 and outputs the detection result to the controller 22 of the battery monitoring device 20.

  The battery monitoring device 20 can communicate bidirectionally with an ECU (Electronic Control Unit) 24. ECU24 switches each system main relay 31-33 on and off by outputting a control signal to system main relay 31,32,33. In addition, the ECU 24 switches the charging relays 35 and 36 on and off by outputting a control signal to the charging relays 35 and 36. The ECU 24 outputs this control information to the battery monitoring device 20 when controlling the system main relays 31 to 33 and the charging relays 35 and 36.

  A system main relay 31 is connected to the positive terminal of the assembled battery 10. The system main relay 31 is switched between on and off by receiving a control signal from the ECU 24. A system main relay 32 is connected to the negative terminal of the assembled battery 10. The system main relay 32 is switched between on and off by receiving a control signal from the ECU 24.

  A system main relay 33 and a limiting resistor 34 are connected in parallel to the system main relay 32. The system main relay 33 is switched between on and off by receiving a control signal from the ECU 24. The limiting resistor 34 is used to suppress an inrush current from flowing when the assembled battery 10 is connected to the inverter 41.

  Information relating to the ignition switch of the vehicle (ON / OFF) is input to the battery monitoring device 20, and the battery monitoring device 20 outputs information relating to the ignition switch to the ECU 24. The assembled battery 10 is connected to the inverter 41 in response to the ignition switch being switched from OFF to ON.

  When connecting the assembled battery 10 to the inverter 41, the ECU 24 switches the system main relay 31 from off to on and switches the system main relay 33 from off to on. As a result, a current flows through the limiting resistor 34. Next, the ECU 24 switches the system main relay 32 from on to off after switching the system main relay 32 from off to on. Thereby, the connection of the assembled battery 10 and the inverter 41 is completed. On the other hand, when the connection between the assembled battery 10 and the inverter 41 is cut off, the ECU 24 switches the system main relays 31 and 32 from on to off.

  The inverter 41 converts the DC power from the assembled battery 10 into AC power and outputs the AC power to the motor / generator 42. For example, a three-phase AC motor can be used as the motor / generator 42. The motor / generator 42 receives AC power from the inverter 41 and generates kinetic energy for running the vehicle. 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 inverter 41 converts the AC power generated by the motor / generator 42 into DC power and outputs the DC power to the assembled battery 10. Thereby, the assembled battery 10 can store regenerative electric power.

  In this embodiment, the assembled battery 10 is connected to the inverter 41, but this is not a limitation. Specifically, the assembled battery 10 can be connected to the booster circuit, and the booster circuit can be connected to the inverter 41. By using the booster circuit, the output voltage of the assembled battery 10 can be boosted. Further, the booster circuit can step down the output voltage from the inverter 41 to the assembled battery 10.

  An AC charger 43 is connected to lines (positive line PL and negative line NL) connecting the assembled battery 10 and the inverter 41. The AC charger 43 converts AC power supplied from an external power source into DC power and supplies it to the assembled battery 10. The AC charger 43 operates in response to a control signal from the ECU 24. The power supply from the external power source to the AC charger 43 can be performed using a cable or can be performed in a non-contact state.

  The external power source is a power source disposed at a location (outside the vehicle) different from the vehicle on which the battery system of the present embodiment is mounted. As the external power source, for example, a commercial power source can be used. In this embodiment, an AC power supply is used as an external power supply, but a DC power supply can also be used. In this case, it is not necessary to convert AC power into DC power using the AC charger 43.

  A charging relay 35 is provided between the AC charger 43 and the positive electrode line PL, and a charging relay 36 is provided between the AC charger 43 and the negative electrode line NL. The charging relays 35 and 36 are switched between on and off in response to a control signal from the ECU 24. When charging the assembled battery 10 using electric power from the external power source, the ECU 24 switches the charging relays 35 and 36 from off to on. At this time, the system main relays 31 and 32 are on.

  In the present embodiment, the AC charger 43 is mounted on the vehicle, but the present invention can be applied even when the AC charger 43 is arranged at a location different from the vehicle. Even when the AC charger 43 is arranged at a location different from the vehicle, the battery system is provided with the charge relays 35 and 36, and the ECU 24 controls the on / off of the charge relays 35 and 36. .

  FIG. 2 is a flowchart showing the processing of the ECU 24.

  In step S101, the ECU 24 determines whether or not the ignition switch is on. If the ignition switch is on, the process proceeds to step S102; otherwise, the process proceeds to step S105.

  In step S <b> 102, the ECU 24 connects the assembled battery 10 to the inverter 41 by controlling on / off of the system main relays (SMR) 31 to 33. Accordingly, the vehicle can travel using the output of the assembled battery 10 (S103).

  If the vehicle is a hybrid vehicle, the ECU 24 can control charging / discharging of the assembled battery 10 so that the SOC (State of Charge) of the assembled battery 10 changes along the reference SOC. If the vehicle is an electric vehicle, the vehicle can be run by discharging the assembled battery 10.

  In step S104, the ECU 24 determines whether or not the ignition switch is off. When the ignition switch is off, the ECU 24 disconnects the connection between the assembled battery 10 and the inverter 41 by controlling on / off of the system main relays 31 and 32 in step S105.

  In step S106, when the ECU 24 receives information related to the charge request, the ECU 24 performs the process of step S107. In step S107, the ECU 24 controls the on / off of the system main relays 31 to 33 to turn on the system main relays 31 and 32.

  In step S108, the ECU 24 switches the charging relays 35 and 36 from off to on. In step S <b> 109, the ECU 24 supplies power from the external power source to the assembled battery 10 by controlling the operation of the AC charger 43. Thereby, the assembled battery 10 can be charged. When the assembled battery 10 is charged using an external power source, it can be charged at a predetermined charging rate.

  FIG. 3 is a flowchart showing the processing of the ECU 24.

  In step S201, the ECU 24 determines whether or not the ignition switch is on. If the ignition switch is on, the process proceeds to step S202.

  In step S202, the ECU 24 determines whether or not the system main relays 31 and 32 are on. When the system main relays 31 and 32 are on, the ECU 24 performs the process of step S203. When the system main relays 31 and 32 are off, the ECU 24 performs the process of step S204.

  In step S204, the ECU 24 determines that the vehicle is parked. The parking state (corresponding to the stop state of the present invention) is a state where the vehicle is not traveling, and is a state where charging / discharging of the assembled battery 10 is prohibited.

  In step S203, the ECU 24 determines whether or not the charging relays 35 and 36 are on. When the charging relays 35 and 36 are on, the ECU 24 determines in step S205 that the vehicle (the assembled battery 10) is in the external charging state. The external charging state is a state where power from an external power source is supplied to the assembled battery 10.

  When the charging relays 35 and 36 are off, the ECU 24 determines in step S206 that the vehicle is in a traveling state. The traveling state is a state where the vehicle is traveling, and includes a state where the vehicle is temporarily stopped by the operation of the brake pedal.

  FIG. 4 is a flowchart showing the processing of the ECU 24.

  In step S301, the ECU 24 determines whether or not the vehicle is in a traveling state. Whether or not the vehicle is in a traveling state can be determined based on the processing described with reference to FIG. When the vehicle is in a running state, the ECU 24 sets the control mode of the battery monitoring device 20 to “1” in step S302 and outputs this setting information to the battery monitoring device 20. When it is determined that the vehicle is not in the traveling state, the ECU 24 performs the process of step S303.

  In step S303, the ECU 24 determines whether or not the vehicle is in an externally charged state. Whether or not the vehicle is in an externally charged state can be determined based on the processing described with reference to FIG. When the vehicle is in the external charging state, the ECU 24 sets the control mode of the battery monitoring device 20 to “2” in step S304 and outputs this setting information to the battery monitoring device 20. When it is determined that the vehicle is not in the external charging state, the ECU 24 performs the process of step S305.

  In step S305, the ECU 24 determines whether or not the vehicle is parked. Whether or not the vehicle is parked can be determined based on the processing described with reference to FIG. When the vehicle is parked, the ECU 24 sets the control mode of the battery monitoring device 20 to “3” and outputs this setting information to the battery monitoring device 20 in step S306.

  FIG. 5 is a flowchart showing processing of the battery monitoring device 20. The process shown in FIG. 5 is executed by the controller 22 of the battery monitoring device 20.

  In step S401, the controller 22 acquires setting information from the ECU 24, and determines whether or not the control mode is “1”. When the control mode is “1”, the controller 22 performs the process of step S402.

  In step S402, the battery monitoring device 20 monitors the charge / discharge state of the assembled battery 10 in the first monitoring mode. In the first monitoring mode, the controller 22 acquires the voltage of the unit cell 11 by using the voltage detection circuit 21. Moreover, the controller 22 determines whether or not the voltage of the unit cell 11 is higher than the upper limit voltage, or determines whether or not it is lower than the lower limit voltage, and monitors the overcharge / discharge state of the battery. The upper limit voltage is a value corresponding to the voltage of the unit cell 11 and is a predetermined value from the viewpoint of suppressing overcharging of the unit cell 11. The lower limit voltage is a value corresponding to the voltage of the unit cell 11 and is a predetermined value from the viewpoint of suppressing overdischarge of the unit cell 11. Here, the voltage of the battery block (referred to as a block voltage) can be used instead of the voltage of the single cell 11. When the block voltage is used, an upper limit voltage or a lower limit voltage corresponding to the block voltage is used.

  When the voltage (or block voltage) of the unit cell 11 is higher than the upper limit voltage, for example, charging of the assembled battery 10 can be prohibited. Specifically, the controller 22 outputs information indicating that the voltage (or block voltage) of the unit cell 11 is higher than the upper limit voltage to the ECU 24. The ECU 24 can inhibit charging of the assembled battery 10 by controlling on / off of the system main relays 31 and 32.

  Moreover, when the voltage (or block voltage) of the cell 11 is lower than the lower limit voltage, for example, the discharge of the assembled battery 10 can be prohibited. Specifically, the controller 22 outputs information indicating that the voltage (or block voltage) of the unit cell 11 is lower than the lower limit voltage to the ECU 24. The ECU 24 can inhibit the assembled battery 10 from being discharged by controlling on / off of the system main relays 31 and 32. Thus, charging / discharging of the assembled battery 10 can be controlled so that the voltage (or block voltage) of the cell 11 changes between the upper limit voltage and the lower limit voltage.

  When the vehicle is in a running state, the input / output of the assembled battery 10 changes according to the running pattern, and the voltage of the assembled battery 10 also changes. In the first monitoring mode, if the block voltage (battery overcharge / discharge state) is detected, it is easier to monitor the voltage that changes every moment according to the running pattern, compared to the case where the voltage of each unit cell 11 is detected. Become.

  In step S403, the controller 22 determines whether or not the control mode is “2”. When the control mode is “2”, the controller 22 performs the process of step S404.

  In step S404, the controller 22 monitors the state of charge of the assembled battery 10 in the second monitoring mode. In the second monitoring mode, the controller 22 uses the voltage detection circuit 21 to acquire the voltage of each unit cell 11 constituting the assembled battery 10, and selects the unit cell 11 indicating the highest voltage among these voltages. Identify. Then, the controller 22 continues to monitor the voltage of the unit cell 11 showing the highest voltage, and determines whether this voltage is higher than the upper limit voltage. The upper limit voltage is a value corresponding to the voltage of the unit cell 11 and is a predetermined value from the viewpoint of suppressing overcharging of the unit cell 11.

  When the voltage of the cell 11 is higher than the upper limit voltage, the charging of the assembled battery 10 can be prohibited. Specifically, the controller 22 outputs information indicating that the voltage of the unit cell 11 is higher than the upper limit voltage to the ECU 24. The ECU 24 can inhibit charging of the assembled battery 10 by controlling on / off of the system main relays 31 and 32. Thereby, the overcharge of the cell 11 can be suppressed.

  In the present embodiment, only the unit cell 11 showing the highest voltage is monitored, but the present invention is not limited to this. Specifically, the controller 22 can monitor predetermined N (positive integer) unit cells 11. The N unit cells 11 are the unit cells 11 indicating the Nth voltage from the highest voltage.

  When the vehicle is in the external charging state, the input to the assembled battery 10 is stably performed, and the voltage of the assembled battery 10 does not change abruptly. Moreover, the battery pack 10 can be charged efficiently by bringing the voltage of the unit cell 11 as close as possible to the upper limit voltage. For this reason, it is preferable to detect the voltage of each single cell 11 rather than detecting the block voltage.

  In step S405, the controller 22 determines whether or not the control mode is “3”. When the control mode is “3”, the controller 22 performs the process of step S406.

  In step S406, the controller 22 monitors the charge / discharge state of the assembled battery 10 in the third monitoring mode. In the third monitoring mode, the controller 22 uses the voltage detection circuit 21 to monitor the voltage of each unit cell 11 constituting the assembled battery 10. In the third monitoring mode, the vehicle is parked and the system main relays 31 to 33 are turned off. For this reason, when the voltage of each unit cell 11 is monitored, the voltage of each unit cell 11 can be acquired by flowing a detection current through the assembled battery 10.

  When the vehicle is parked, the state of each single battery 11 can be confirmed before the vehicle is driven. The state of the unit cell 11 includes a state of charge (SOC). Since the SOC and the OCV (Open Circuit Voltage) of the unit cell 11 are in a correspondence relationship, the SOC can be specified from the OCV by obtaining this correspondence relationship in advance. When the vehicle is in a parked state, charging / discharging of the assembled battery 10 is not performed as the vehicle travels, and thus it becomes easy to specify the OCV by detecting the voltage of each single cell 11.

  A battery system that is Embodiment 2 of the present invention will be described. Here, components having the same functions as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, differences from the first embodiment will be mainly described.

  In this embodiment, two current sensors (a first current sensor and a second current sensor) are used as the current sensor 23. The detection range of the first current sensor 23 is ± R1 [A], and the detection range of the second current sensor 23 is ± R2 [A]. R1 is a value larger than R2.

  That is, the first current sensor 23 can detect a current value in a wider range than the second current sensor 23. Further, since the detection range of the second current sensor 23 is narrower than the detection range of the first current sensor 23, the resolution of the second current sensor 23 can be made higher than the resolution of the first current sensor 23. Thereby, if the 2nd current sensor 23 is used, a detection accuracy can be improved compared with the case where the 1st current sensor 23 is used.

  FIG. 6 is a flowchart showing processing of the battery monitoring device 20 in the present embodiment. The process shown in FIG. 6 is executed by the controller 22 of the battery monitoring device 20. The controller 22 acquires setting information (see FIG. 4) from the ECU 24 and determines the control mode. FIG. 7 shows the usage state of the first current sensor and the second current sensor in each control mode.

  In step S501, the controller 22 determines whether or not the control mode is “1”. When the control mode is “1”, the controller 22 performs the process of step S502. In step S502, the controller 22 monitors the charge / discharge current of the assembled battery 10 using the first current sensor 23 as the first monitoring mode.

  When the vehicle is in a running state, the charge / discharge current of the battery pack 10 varies greatly according to the running pattern of the vehicle. Therefore, when the control mode is “1”, the charge / discharge current of the assembled battery 10 corresponding to the traveling pattern of the vehicle is monitored by using the first current sensor 23 having a detection range wider than that of the second current sensor 23. It becomes easy.

  In step S503, the controller 22 determines whether or not the control mode is “2”. When the control mode is “2”, the controller 22 performs the process of step S504. In step S504, the controller 22 monitors the charging current of the assembled battery 10 using the second current sensor 23 as the second monitoring mode.

  When the vehicle is in an externally charged state, the battery pack 10 is often charged with a constant current. Further, the current value when charging the assembled battery 10 is smaller than the current value during traveling except for so-called rapid charging. Therefore, when the control mode is “2”, the charging current of the assembled battery 10 can be monitored by using the second current sensor 23 having a detection range narrower than that of the first current sensor 23. Further, since the resolution of the second current sensor 23 is higher than the resolution of the first current sensor 23, the charging current detection accuracy can be improved by using the second current sensor 23.

  In step S505, the controller 22 determines whether or not the control mode is “3”. When the control mode is “3”, the controller 22 performs the process of step S506. In step S506, the controller 22 monitors the charge / discharge current of the assembled battery 10 using the first current sensor 23 as the third monitoring mode. In the third monitoring mode, the first current sensor 23 is used, but the second current sensor 23 may be used instead of the first current sensor 23.

  When the vehicle is parked, the charge / discharge current of the battery pack 10 is substantially zero. Even when the vehicle is parked, it is possible to check whether or not an unintended current is flowing through the assembled battery 10 by monitoring the current flowing through the assembled battery 10.

  In the present embodiment, two current sensors 23 are used, but the present invention is not limited to this, and only one current sensor 23 can be used. When one current sensor 23 is used, the detection range of the current sensor 23 may be switched between ± R1 and ± R2. That is, if the resolution of the current sensor 23 is switched, the detection range can be switched between ± R1 and ± R2.

  A battery system that is Embodiment 3 of the present invention will be described. Here, components having the same functions as those described in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, differences from the first and second embodiments will be mainly described.

  In the present embodiment, as in the second embodiment, two current sensors (a first current sensor and a second current sensor) are used as the current sensor 23. The detection ranges of the two current sensors 23 are the same as the detection ranges described in the second embodiment.

  FIG. 8 is a flowchart showing processing of the battery monitoring device 20 in the present embodiment. The process shown in FIG. 8 is executed by the controller 22 of the battery monitoring device 20. The controller 22 acquires setting information (see FIG. 4) from the ECU 24 and determines the control mode. FIG. 9 shows the usage state of the first current sensor and the second current sensor in each control mode.

  In step S601, the controller 22 determines whether or not the control mode is “1”. When the control mode is “1”, the controller 22 performs the process of step S602. In step S602, the controller 22 monitors the charge / discharge current of the assembled battery 10 using the first current sensor 23 and the second current sensor 23 as the first monitoring mode.

  In the first monitoring mode, the detection operation using the first current sensor 23 is performed at the detection cycle f1 [msec], and the detection operation using the second current sensor 23 is performed at the detection cycle f3 [msec]. The detection cycle f1 is shorter than the detection cycle f3.

  When the vehicle is in a traveling state, the charging / discharging current of the assembled battery 10 may change greatly depending on the traveling pattern of the vehicle. Since the detection range of the first current sensor 23 is wider than the detection range of the second current sensor 23, when the control mode is “1”, by performing the detection operation using the first current sensor 23, It becomes easy to monitor the change of the charge / discharge current according to the running pattern. Further, by making the detection cycle f1 shorter than the detection cycle f3, it becomes easier to monitor the change in the charge / discharge current that changes every moment according to the running of the vehicle. Furthermore, the detection accuracy of the charging / discharging current can be ensured by performing the detection operation by the second current sensor 23 in the detection cycle f3.

  In step S603, the controller 22 determines whether or not the control mode is “2”. When the control mode is “2”, the controller 22 performs the process of step S604. In step S604, the controller 22 monitors the charging current of the assembled battery 10 using the first current sensor 23 and the second current sensor 23 as the second monitoring mode.

  In the second monitoring mode, the detection operation using the first current sensor 23 is performed at the detection cycle f2 [msec], and the detection operation using the second current sensor 23 is performed at the detection cycle f4 [msec]. The detection cycle f4 is shorter than the detection cycle f2. The detection cycle f2 is longer than the detection cycle f1, and the detection cycle f4 is shorter than the detection cycle f3.

  When the vehicle is in an external charging state, the assembled battery 10 is often charged with a constant current and a low current. Since the detection range of the second current sensor 23 is narrower than the detection range of the first current sensor 23, when the control mode is “2”, by performing the detection operation using the second current sensor 23, external charging is performed. It becomes easy to monitor the charging current in the state. Further, since the detection cycle f4 is shorter than the detection cycle f2, the detection operation using the second current sensor 23 can be performed with priority, and monitoring of the charging current can be improved. Furthermore, a charging current that cannot be detected by the second current sensor 23 can be detected by performing a detection operation by the first current sensor 23 in the detection cycle f2.

  In step S605, the controller 22 determines whether or not the control mode is “3”. When the control mode is “3”, the controller 22 performs the process of step S606. In step S606, the controller 22 monitors the charge / discharge current of the assembled battery 10 using the first current sensor 23 and the second current sensor 23 as the third monitoring mode.

  In the third monitoring mode, the detection operation using the first current sensor 23 is performed at the detection cycle f1 [msec], and the detection operation using the second current sensor 23 is performed at the detection cycle f3 [msec]. The third monitoring mode is not limited to the detection operation described in this embodiment. Specifically, only one of the first current sensor 23 and the second current sensor 23 can be used. Further, the detection cycle by the second current sensor 23 and the detection cycle by the first current sensor 23 can be set as appropriate.

  A battery system that is Embodiment 4 of the present invention will be described. FIG. 10 is a schematic diagram showing the configuration of the battery system of this example. Here, components having the same functions as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, differences from the first embodiment will be mainly described.

  In the first embodiment, the ECU 24 determines whether the vehicle is in a traveling state, an external charging state, or a parking state based on on / off of the system main relays 31 to 33 and the charging relays 35 and 36. . Further, the controller 22 of the battery monitoring device 20 acquires setting information (control mode shown in FIG. 4) in the ECU 24 by communication with the ECU 24.

  In this embodiment, the controller 22 of the battery monitoring device 20 is in a running state, an external charging state, or a parking state based on whether the system main relays 31 to 33 or the charging relays 35 and 36 are on / off. Is determined. Moreover, the controller 22 has changed the method of monitoring the assembled battery 10 based on the result of having determined the state of the vehicle.

  The ECU 24 outputs a control signal for controlling on / off of the system main relays 31 to 33 to the system main relays 31 to 33. The control signal output from the ECU 24 to the system main relays 31 to 33 is also input to the battery monitoring device 20. As a result, the controller 22 can determine whether the system main relays 31 to 33 are on or off.

  The ECU 24 outputs a control signal for controlling on / off of the charging relays 35 and 36 to the charging relays 35 and 36. The control signal output from the ECU 24 to the charging relays 35 and 36 is also input to the battery monitoring device 20. As a result, the controller 22 can determine whether the charging relays 35 and 36 are on or off.

  The controller 22 determines whether the vehicle is in a traveling state, an external charging state, or a parking state based on the states of the system main relays 31 to 33 and the charging relays 35 and 36. This determination processing is the same as the flowchart described in the first embodiment (FIG. 3).

  When the vehicle is in a traveling state, the controller 22 monitors the charge / discharge state of the assembled battery 10 in the first monitoring mode. In the first monitoring mode, any one of the processes described in the first embodiment (S402 in FIG. 5), the second embodiment (S502 in FIG. 6), and the third embodiment (S602 in FIG. 8) can be performed. it can.

  When the vehicle is in the external charging state, the controller 22 monitors the charging state of the assembled battery 10 in the second monitoring mode. In the second monitoring mode, any one of the processes described in the first embodiment (S404 in FIG. 5), the second embodiment (S504 in FIG. 6), and the third embodiment (S604 in FIG. 8) can be performed. it can.

  When the vehicle is in a parked state, the controller 22 monitors the charge / discharge state of the assembled battery 10 in the third monitoring mode. In the third monitoring mode, any one of the processes described in the first embodiment (S406 in FIG. 5), the second embodiment (S506 in FIG. 6), and the third embodiment (S606 in FIG. 8) can be performed. it can.

  A battery system that is Embodiment 5 of the present invention will be described. Here, components having the same functions as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, differences from the first embodiment will be mainly described.

  FIG. 11 is a flowchart showing processing of the battery monitoring device 20. The process shown in FIG. 11 is executed by the controller 22.

  In step S701, the controller 22 determines whether or not the ignition switch is on. If the ignition switch is on, the controller 22 acquires the charge / discharge current of the assembled battery 10 using the current sensor 23 in step S702.

  In step S703, the controller 22 determines whether or not the current value acquired in step S702 is substantially zero. The term “substantially zero” refers to a detection error of the current sensor 23 and the like, and substantially means a state in which no current flows through the assembled battery 10. If the current value is not substantially zero, the process proceeds to step S704, and if not, the process proceeds to step S705. In step S705, the controller 22 determines that the vehicle is parked. When the vehicle is in a parked state, the system main relays 31 to 33 are off, so that no current flows through the assembled battery 10.

  In step S704, the controller 22 determines whether or not the current value acquired in step S702 has changed. If the current value has not changed, in step S706, the controller 22 determines that the vehicle is in an externally charged state. When the vehicle is in the external charging state, the battery pack 10 is charged with a constant current. Therefore, it is possible to determine whether or not the vehicle is in the external charging state by monitoring a change in the current value. it can.

  If it is determined in step S704 that the current value has changed, the controller 22 determines in step S707 that the vehicle is in a traveling state. Since the charging / discharging current of the assembled battery 10 changes according to the running pattern of the vehicle, it can be determined that the vehicle is in a running state when the current value is changing.

  In the present embodiment, based on the current value detected by the current sensor 23, it can be determined whether the vehicle is in a running state, a parking state, or an external charging state. After determining the state of the vehicle, as described in the first to third embodiments, the charge / discharge state of the assembled battery 10 can be monitored in the monitoring mode corresponding to the state of the vehicle.

  In the first to fifth embodiments described above, it is determined whether the vehicle is in the traveling state, the parking state, or the external charging state, but the present invention is not limited to this. Specifically, in a vehicle that does not include a charger, it can be determined whether the vehicle is in a traveling state or a parking state.

10: assembled battery (power storage device) 11: single battery (power storage element)
20: Battery monitoring device 21: Voltage detection circuit 22: Controller 23: Current sensor 24: ECU (Electronic Control Unit) 31-33: System main relay 34: Limiting resistor 35, 36: Charging relay 41: Inverter 42: Motor generator 43: AC charger

Claims (16)

A monitoring system for monitoring a charge / discharge state of a power storage device that outputs energy for running a vehicle,
A controller for monitoring the charge / discharge state according to the running state and the stop state of the vehicle;
The controller acquires control information for controlling a system main relay that allows and prohibits charging / discharging of the power storage device, and the vehicle travels when the system main relay is in a state that allows charging / discharging of the power storage device. It is determined that the vehicle is in a state, and when the system main relay is in a state where charging and discharging of the power storage device is prohibited, it is determined that the vehicle is in a stopped state. The power storage device has a plurality of power storage elements connected in series,
The controller is
When the vehicle is in a running state, the plurality of power storage elements are divided into a plurality of blocks, and the voltage of each block when the plurality of power storage elements are included in each block is monitored,
The monitoring system according to claim 1, wherein when the vehicle is in a stopped state, the voltage of each storage element is monitored. The controller is
When the vehicle is in an external charging state in which power is supplied from an external power source to the power storage device, the charging state is monitored according to the external charging state,
Control information for controlling a charging relay that permits and prohibits the power supply is acquired, and when the charging relay is in a state that allows the power supply, it is determined that the vehicle is in the external charging state. The monitoring system according to claim 1 or 2. The power storage device has a plurality of power storage elements connected in series,
4. The monitoring system according to claim 3, wherein the controller monitors a voltage of the power storage element showing the highest voltage among the plurality of power storage elements when the vehicle is in the external charging state. 5. The controller is
When the vehicle is in a running state, the charge / discharge current of the power storage device is monitored in a first detection range using a current sensor,
5. The charging current of the power storage device is monitored in a second detection range narrower than the first detection range by using a current sensor when the vehicle is in the external charging state. The monitoring system described.   The controller performs current detection in a first detection range in a first cycle when the vehicle is in a traveling state, and performs current detection in a second detection range that is narrower than the first detection range in the first cycle. The monitoring system according to any one of claims 1 to 4, wherein the monitoring system is performed in a longer second period.   The controller performs current detection in a first detection range in a third period when the vehicle is in the external charging state, and performs current detection in a second detection range that is narrower than the first detection range. The monitoring system according to claim 3, 4 or 6, wherein the monitoring is performed in a fourth period shorter than three periods. A monitoring system for monitoring a charge / discharge state of a power storage device that outputs energy for running a vehicle,
A controller that monitors the charge / discharge state according to the running state and the stop state of the vehicle;
A current sensor that outputs information on the charge / discharge current of the power storage device to the controller;
Have
The controller determines that the vehicle is in a running state when the charge / discharge current of the power storage device is changing, and determines that the vehicle is in a stopped state when no charge / discharge current flows through the power storage device. A monitoring system characterized by discrimination. The controller is
When the vehicle is in an external charging state in which power is supplied from an external power source to the power storage device, the charging state is monitored according to the external charging state,
The monitoring system according to claim 8, wherein when the charging current of the power storage device is maintained at a value larger than zero, the vehicle is determined to be in the external charging state. A monitoring method for monitoring a charge / discharge state of a power storage device that outputs energy for running a vehicle,
Obtain control information for controlling a system main relay that permits and prohibits charging and discharging of the power storage device,
When the system main relay is in a state allowing charge / discharge of the power storage device, the vehicle is determined to be in a running state, and the charge / discharge state is monitored according to the running state,
When the system main relay is in a state of prohibiting charging / discharging of the power storage device, it is determined that the vehicle is in a stopped state, and the charge / discharge state is monitored according to the stopped state.
A monitoring method characterized by that. The power storage device has a plurality of power storage elements connected in series,
When the vehicle is in a running state, the plurality of power storage elements are divided into a plurality of blocks, and the voltage of each block when the plurality of power storage elements are included in each block is monitored,
The monitoring method according to claim 10, wherein the voltage of each power storage element is monitored when the vehicle is stopped. Obtain control information for controlling a charging relay that permits and prohibits power supply from an external power source to the power storage device,
When the charging relay is in a state allowing the power supply, the vehicle is determined to be in an external charging state, and the charging state is monitored according to the external charging state.
The monitoring method according to claim 10 or 11, wherein The power storage device has a plurality of power storage elements connected in series,
13. The monitoring method according to claim 12, wherein when the vehicle is in the external charging state, the voltage of the power storage element showing the highest voltage among the plurality of power storage elements is monitored. When the vehicle is in a running state, the charge / discharge current of the power storage device is monitored in a first detection range using a current sensor,
The charging current of the power storage device is monitored in a second detection range narrower than the first detection range by using a current sensor when the vehicle is in the external charging state. The monitoring method described.   When the vehicle is in a running state, current detection in the first detection range is performed in the first cycle, and current detection in the second detection range that is narrower than the first detection range is performed in the first cycle longer than the first cycle. The monitoring method according to claim 10, wherein the monitoring method is performed in two cycles. When the vehicle is in the external charging state, the current detection in the first detection range is performed in the third period, and the current detection in the second detection range that is narrower than the first detection range is performed in the third period. The monitoring method according to claim 12 or 13, wherein the monitoring is performed in a short fourth period.

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