JP5561114B2 - Storage device control device, vehicle equipped with the same, and storage device control method - Google Patents

Description

  The present invention relates to a control device for a power storage device, a vehicle on which the power storage device is mounted, and a control method for the power storage device, and more specifically, detects an operation of a current interrupt device (CID) included in the power storage device. For technology.

  2. Description of the Related Art In recent years, attention has been paid to a vehicle that is mounted with a power storage device (for example, a secondary battery or a capacitor) and travels using driving force generated from electric power stored in the power storage device as an environment-friendly vehicle. Examples of the vehicle include an electric vehicle, a hybrid vehicle, and a fuel cell vehicle.

  Such a power storage device is generally configured to output a desired voltage by stacking a plurality of battery cells in series or in parallel. In these battery cells, when abnormality such as disconnection or short circuit occurs, the function of the power storage device may not be normally performed. Therefore, it is necessary to detect abnormality of the battery cell.

  Japanese Patent Laying-Open No. 2007-018771 (Patent Document 1) discloses a system having a voltage detection circuit for detecting whether or not an overvoltage is generated in a cell in a power storage device. Disclose control when an abnormality occurs.

  According to Japanese Patent Laying-Open No. 2007-018771 (Patent Document 1), when an abnormality occurs in the voltage detection circuit, the charging voltage when charging the power storage device is limited to be lower than a desired voltage, whereby the power storage device The operation of the load supplied from the power storage device can be ensured while suppressing overcharging of the battery.

JP 2007-018871 A JP 2009-071901 A JP 2004-236473 A JP 2007-244123 A

  Some of such power storage devices include a current interrupt device (hereinafter also referred to as CID “Current Interrupt Device”) in each battery cell. This CID generally has a configuration in which, when an abnormality occurs in a battery cell and the internal pressure of the battery cell exceeds a specified value, the CID is activated by the internal pressure to cut off the energization path of the power storage device in hardware. Therefore, the overvoltage of the power storage device is prevented by operating the CID.

  However, it may not be possible to directly detect whether or not the CID is activated. For example, in a hybrid vehicle or the like, if the vehicle continues to run while the CID is activated, a large voltage is applied to the CID and the battery cell is operated. May cause secondary sparks, etc. Therefore, it is necessary to quickly detect that the CID has been operated.

  In Japanese Patent Application Laid-Open No. 2007-018871 (Patent Document 1) and the other patent documents described above, this CID is not described, and nothing is shown about the CID operation detection method.

  The present invention has been made to solve such a problem, and an object of the present invention is to accurately detect the operation of the CID in a system including a power storage device including the CID.

  A control device for a power storage device according to the present invention is a control device for a power storage device for supplying drive power to a load device, and includes a setting unit, a calculation unit, and a determination unit. The power storage device includes a shut-off device configured to operate when the internal pressure of the power storage device exceeds a specified value and shuts off the energization path of the power storage device. The setting unit sets a first deviation between the output voltage of the power storage device and the input voltage from the power storage device to the load device at a predetermined timing as a reference deviation. The calculation unit calculates a second deviation between the output voltage and the input voltage after the above timing. The determination unit determines whether or not the shut-off device is activated based on a comparison between a difference value between the reference deviation and the second deviation and a predetermined threshold value.

  Preferably, the calculation unit calculates the second deviation while charging / discharging of the power storage device is stopped.

  Preferably, the determination unit determines that the shut-off device is activated when the magnitude of the difference value exceeds a threshold value, and determines that the shut-off device is inactive when the magnitude of the difference value is less than the threshold value.

  Preferably, a capacitor connected in parallel with the power storage device is provided between the input terminals of the load device.

  Preferably, the setting unit is set in advance after a switching device provided between the power storage device and the load device is turned on to switch between conduction and non-conduction between the power storage device and the load device. The reference deviation is set with the deviation after the elapse of time as the first deviation.

  Preferably, the setting unit sets the reference deviation with a deviation during a period during which the power storage device is being charged / discharged as a first deviation.

  Preferably, the setting unit sets the reference deviation using a value obtained by smoothing the deviation during the period in which the power storage device is charged and discharged in the time axis direction as a first deviation.

  Preferably, the control device is provided between the power storage device and the load device in order to switch between conduction and non-conduction between the power storage device and the load device when the determination unit determines that the shut-off device is activated. The switching device further includes a control unit for switching to the non-conduction.

  Preferably, the calculation unit determines whether charging / discharging of the power storage device is stopped based on whether the load device is driven.

  Preferably, the calculation unit determines whether charging / discharging of the power storage device is stopped based on a current value input / output to / from the power storage device.

  Preferably, the power storage device, the load device, and the control device are mounted on a vehicle. The load device includes a drive device configured to generate a drive force of the vehicle using electric power from the power storage device.

  Preferably, the load device further includes an auxiliary device that operates using electric power from the power storage device.

  A vehicle according to the present invention includes a power storage device, a load device including a drive device configured to generate a driving force of the vehicle using electric power from the power storage device, and a control device for controlling the power storage device. . The power storage device includes a shut-off device that is configured to operate when the internal pressure of the power storage device exceeds a specified value and to shut off the energization path of the power storage device. The control device includes a setting unit, a calculation unit, and a determination unit. The setting unit sets a first deviation between the output voltage of the power storage device and the input voltage from the power storage device to the load device at a predetermined timing as a reference deviation. The calculation unit calculates a second deviation between the output voltage and the input voltage after the timing. The determination unit determines whether or not the shut-off device is activated based on a comparison between a difference value between the reference deviation and the second deviation and a predetermined threshold value.

  The power storage device control method according to the present invention is a control method for a power storage device for supplying driving power to a load device. The power storage device includes a shut-off device that is configured to operate when the internal pressure of the power storage device exceeds a specified value and to shut off the energization path of the power storage device. The control method includes a step of setting, as a reference deviation, a first deviation between the output voltage of the power storage device and the input voltage from the power storage device to the load device at a predetermined timing, and the output voltage and input voltage after the timing. Calculating a second deviation between the reference deviation and the reference deviation and a magnitude of a difference value between the second deviation and a predetermined threshold value, and determining whether or not the shut-off device is activated. Is provided.

  Preferably, the control method is provided between the power storage device and the load device in order to switch between conduction and non-conduction between the power storage device and the load device when it is determined in the determination step that the shut-off device is activated. The method further includes the step of switching the switching device provided to non-conduction.

  ADVANTAGE OF THE INVENTION According to this invention, in the system provided with the electrical storage apparatus containing CID, the action | operation of CID can be detected accurately.

1 is an overall block diagram of a vehicle according to an embodiment. It is a figure which shows the detailed structure of an electrical storage apparatus. It is a figure for demonstrating the outline | summary of the operation | movement detection control of CID in this Embodiment. In this Embodiment, it is a functional block diagram for demonstrating the detection detection control of CID performed by ECU. In this Embodiment, it is a flowchart for demonstrating the detail of the action | operation detection control process of CID performed by ECU.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  FIG. 1 is an overall block diagram showing a charging system 10 including a vehicle 100 according to the present embodiment.

  Referring to FIG. 1, vehicle 100 includes a power storage device 110, a system main relay (SMR) 115, a load device 180, an alarm device 190, and an ECU (Electronic Control Unit) 300 that is a control device. And a capacitor C1 and a resistor R1. Load device 180 includes a drive device 120 and an auxiliary device 170.

  Drive device 120 includes a converter 121, inverters 122 and 123, motor generators 130 and 135, a power transmission gear 140, drive wheels 150, an engine 160 that is an internal combustion engine, and a capacitor C2.

  The power storage device 110 is a power storage element configured to be chargeable / dischargeable. The power storage device 110 includes, for example, a secondary battery such as a lithium ion battery, a nickel metal hydride battery, or a lead storage battery, or a power storage element such as an electric double layer capacitor.

  Power storage device 110 is connected to drive device 120 through power line PL1 and ground line NL1. Then, power storage device 110 supplies electric power for generating driving force of vehicle 100 to driving device 120. Power storage device 110 stores the electric power generated by motor generators 130 and 135. The output of power storage device 110 is, for example, about 200V.

  Relays included in SMR 115 are inserted in power line PL1 and ground line NL1 that connect power storage device 110 and drive device 120, respectively. Then, SMR 115 switches between power supply and cutoff between power storage device 110 and drive device 120 based on control signal SE <b> 1 from ECU 300.

  Converter 121 performs voltage conversion between power line PL1 and ground line NL1, power line PL2 and ground line NL1, based on control signal PWC from ECU 300.

  Inverters 122 and 123 are connected in parallel to power line PL2 and ground line NL1. Inverters 122 and 123 convert DC power supplied from converter 121 to AC power based on control signals PWI1 and PWI2 from ECU 300, respectively, and drive motor generators 130 and 135, respectively.

  Capacitor C1 is provided between power line PL1 and ground line NL1, and reduces voltage fluctuation between power line PL1 and ground line NL1. Capacitor C2 is provided between power line PL2 and ground line NL1, and reduces voltage fluctuation between power line PL2 and ground line NL1.

  Voltage sensors 124 and 125 detect voltages VL and VH applied to both ends of capacitors C1 and C2, respectively, and output the detected values to ECU 300.

  Resistor R1 is provided in parallel with capacitor C1 between power line PL1 and ground line NL1. The resistor R1 is a discharge resistor for discharging the charge remaining in the capacitor C1 after the operation of the vehicle 100 is finished. During driving of the vehicle, it is preferable that the discharge by the resistor R1 is as small as possible from the viewpoint of efficiency. Therefore, the resistance value of the resistor R1 is set to a relatively high value.

  Motor generators 130 and 135 are AC rotating electric machines, for example, permanent magnet type synchronous motors having a rotor in which permanent magnets are embedded.

  The output torque of motor generators 130 and 135 is transmitted to drive wheels 150 via power transmission gear 140 including a reduction gear and a power split mechanism, and causes vehicle 100 to travel. Motor generators 130 and 135 can generate electric power by the rotational force of drive wheels 150 during regenerative braking operation of vehicle 100. Then, the generated power is converted into charging power for power storage device 110 by drive device 120.

  Motor generators 130 and 135 are also coupled to engine 160 through power transmission gear 140. Then, ECU 300 causes motor generators 130 and 135 and engine 160 to operate in a coordinated manner to generate a necessary vehicle driving force. Further, motor generators 130 and 135 can generate electric power by rotation of engine 160, and can charge power storage device 110 using the generated electric power. In the present embodiment, motor generator 135 is used exclusively as an electric motor for driving drive wheels 150, and motor generator 130 is used exclusively as a generator driven by engine 160.

  In FIG. 1, a configuration in which two motor generators are provided is shown as an example. However, the number of motor generators is not limited to this, and the number of motor generators is one, or more than two motor generators are provided. It is good also as a structure. The engine 160 is not an essential component, and may be an electric vehicle or a fuel cell vehicle that does not include the engine 160. Furthermore, the load connected to power storage device 110 is not limited to the vehicle as described above, and the present embodiment can be applied to any electrical device that is driven by electric power output from power storage device 110.

  The load device 180 includes an auxiliary device 170 as a low voltage system (auxiliary system) configuration. Auxiliary equipment 170 includes a DC / DC converter 171, an auxiliary equipment load 172, an auxiliary equipment battery 173, and an air conditioner 174 that is an air conditioner.

  DC / DC converter 171 is connected to power lines PL1 and NL1, and reduces the DC voltage supplied from power storage device 110 to a predetermined voltage based on control signal PWD from ECU 300. Then, DC / DC converter 171 supplies driving power to auxiliary load 172 or supplies charging power of auxiliary battery 173 via power line PL3.

  The auxiliary machine load 172 includes, for example, lamps, wipers, heaters, audio, a navigation system, and the like.

  Auxiliary battery 173 is typically formed of a lead storage battery. The output voltage of auxiliary battery 173 is lower than the output voltage of power storage device 110, for example, about 12V.

  Air conditioner 174 is connected in parallel with DC / DC converter 171 to power lines PL1 and NL1. The air conditioner 174 is driven by a control signal ACON from the ECU 300 and performs air conditioning in the vehicle compartment.

  The alarm device 190 is a device for notifying the user of the occurrence of an abnormality based on a control signal ALM from the ECU 300 when an abnormality or the like occurs. Alarm device 190 includes, for example, a visual notification such as a lamp, LED, or liquid crystal display panel, and an aural notification such as a buzzer, chime, or voice alarm.

  ECU 300 includes a CPU (Central Processing Unit), a storage device, and an input / output buffer, all of which are not shown in FIG. 1, and inputs signals from each sensor and the like, and outputs control signals to each device. 100 and each device are controlled. Note that these controls are not limited to processing by software, and can be processed by dedicated hardware (electronic circuit).

  ECU 300 calculates a state of charge (SOC) of power storage device 110 based on detected values of voltage VB and current IB from voltage sensor 111 and current sensor 112 provided in power storage device 110.

  The power storage device 110 is configured to output a desired voltage by connecting a plurality of battery cells in series, as will be described later with reference to FIG. 2, but the voltage VB detected by the voltage sensor 111 is In general, the calculation is based on the sum of the voltages of the individual battery cells, not the voltage across the power storage device 110. Therefore, the output of the voltage VB does not necessarily become zero even when the CID is activated.

  ECU 300 generates and outputs a control signal for controlling drive device 120, SMR 115, and the like. In FIG. 1, one control device is provided as the ECU 300, but for each function or control target device, such as a control device for the driving device 120 or a control device for the power storage device 110, for example. It is good also as a structure which provides a separate control apparatus.

  Vehicle 100 includes a charging device 200, a charging relay CHR 210, and a connection unit 220 as a configuration for charging power storage device 110 with electric power from external power supply 500.

  A charging connector 410 of the charging cable 400 is connected to the connection unit 220. Then, electric power from external power supply 500 is transmitted to vehicle 100 via charging cable 400.

  In addition to charging connector 410, charging cable 400 includes a plug 420 for connecting to outlet 510 of external power supply 500, and an electric wire portion 430 for connecting charging connector 410 and plug 420. Charging circuit interruption device (hereinafter also referred to as CCID (Charging Circuit Interrupt Device)) 440 for switching between supply and interruption of electric power from external power supply 500 is inserted in electric wire portion 430.

  Charging device 200 is connected to connection unit 220 via power lines ACL1 and ACL2. Charging device 200 is connected to power storage device 110 through CHR 210 by power line PL2 and ground line NL2.

  Charging device 200 is controlled by control signal PWE from ECU 300, and converts AC power supplied from connection unit 220 into charging power for power storage device 110.

  CHR 210 is controlled by a control signal SE2 from ECU 300, and switches between supplying and stopping charging power from charging device 200 to power storage device 110.

  In FIG. 1, the case where the charging cable 400 is directly connected to the external power source 500 by being connected to the outlet 510 has been described as an example, but power is supplied between the charging cable 400 and the external power source 500. An apparatus may be provided.

  FIG. 2 is a diagram showing a detailed configuration of power storage device 110. Referring to FIG. 2, power storage device 110 is configured to include a plurality of battery cells CL1 to CLn (hereinafter also collectively referred to as CL) connected in series, and a desired output depending on the number of battery cells CL. A voltage is obtained. Each battery cell CL is provided with a current interrupt device CID.

  When the internal pressure of the battery cell CL exceeds a specified value due to the gas generated from the electrolyte of the battery cell CL, the CID is activated by the internal pressure and physically shuts off the battery cell from other battery cells. . Therefore, when any CID of battery cell CL is activated, no current flows through power storage device 110.

  Thus, when the CID is activated and the current is interrupted, a differential voltage between the total voltage of the battery cells other than the battery cell in which the CID is activated and the input voltage VL to the load device 180 is applied to the activated CID. It is known that Therefore, when the electric charge of the capacitor C1 decreases and the voltage VL decreases due to power consumption by the driving device 120, the auxiliary device 170, or the resistor R1, for example, in the state where the SMR 115 is conducted, the voltage VL is applied accordingly. The voltage increases. Since the gap between the portions cut off by the CID is small, if the voltage applied to the CID exceeds a predetermined withstand voltage, a secondary failure is induced, for example, a spark is generated in the gap. There is a fear. Therefore, it is necessary to quickly detect the operation of the CID, but generally, the battery cell CL may not have a means for outputting that the CID has been operated.

  Further, it is known from experiments that the voltage VL fluctuates when the CID is activated. This is because charging / discharging from the power storage device 110 to the load device 180 is interrupted, and thus the amount of charge stored in the capacitor C1 varies depending on power consumption or power generation by the driving device 120 and power consumption by the auxiliary device 170. is there.

  For example, when the CID operates at a high load when the vehicle 100 is traveling and the power consumption by the driving device 120 is large, the voltage VL decreases rapidly compared to the case where the CID is not operating. . For this reason, when the load is high, it is possible to detect whether or not the CID is activated by monitoring the degree of increase or decrease of the voltage VL.

  However, for example, when the CID is activated when the power consumption of the entire load device 180 is small, or when the power generated by the motor generator is balanced with the power consumption, the power stored in the capacitor C1 is consumed. In other words, the fluctuation amount of the voltage VL can be reduced. If it does so, it will become difficult to detect the action | operation of CID only by monitoring the fluctuation | variation of the voltage VL, and there exists a possibility that the detection that the CID act | operated may be overdue.

  In view of such a problem, in the present embodiment, a deviation between output voltage VB of power storage device 110 and input voltage VL of load device 180 is stored as a reference deviation at a predetermined timing, and a voltage after the predetermined timing is stored. Based on the difference value between the deviation of VB and voltage VL and the reference deviation, CID operation detection control is performed to detect whether or not the CID is activated. By doing so, it is possible to accurately detect that the CID has been activated even at a low load, which is difficult to detect with only the amount of change in the voltage VL.

  FIG. 3 is a diagram for explaining the outline of the CID operation detection control in the present embodiment.

  Referring to FIGS. 1 and 3, vehicle 100 is started at time t1, and SMR 115 is turned on (conductive state). Thereby, capacitor C1 is charged by the electric power from power storage device 110, and voltage VL increases (curve W2 in FIG. 3). Originally, the voltage VB and the voltage VL should show substantially the same value, but the detected value is reduced due to a voltage difference caused by a difference between voltage sensors or a resistance component of the auxiliary device 170 and the energization path. Some offset can occur.

  ECU 300 stores the difference between voltage VB of power storage device 110 and voltage VL of capacitor C1 when SMR 115 is turned on and capacitor C1 is initially charged as an initial value of reference deviation ΔVref. The initial value of reference deviation ΔVref can be a reference value in the case where charging / discharging from power storage device 110 is not performed after SMR is turned on.

  FIG. 3 shows a case where the CID is not operating at time t1, but if the CID is already operating when the SMR 115 is turned on, the capacitor C1 is not turned on even if the SMR 115 is turned on. Is not charged. For this reason, when the initial value of the reference deviation ΔVref is larger than a predetermined value, it may be detected that the CID may already be operating.

  Next, during the period from time t1 to time t2 in FIG. 3, the load device 180 is driven, whereby charging / discharging from the power storage device 110 is performed. FIG. 3 shows an example in which discharging is performed from power storage device 110 when load device 180 consumes power, and accordingly, voltage VB and voltage VL decrease.

  ECU 300 sequentially calculates deviation ΔV between voltage VB and voltage VL while charging / discharging of power storage device 110 is continued. At this time, in order to reduce the influence of a sudden change in the detected voltage value, ECU 300 performs smoothing by performing, for example, a moving average process on the calculated deviation. Then, ECU 300 sets (updates) the smoothed deviation as reference deviation ΔVref. Note that a method other than the moving average process may be used as the smoothing method.

  Thereafter, at time t2, when driving of the load device 180 is stopped or when the power generated by the motor generators 130 and 135 and the power consumption of the load device 180 are balanced, charging / discharging from the power storage device 110 is accordingly performed. Stopped. At this point, the SMR 115 remains on.

  At this time, ECU 300 maintains reference deviation ΔVref at time t2 and monitors and compares voltage VB and voltage VL deviation ΔV with reference deviation ΔVref in a state where charging / discharging is stopped.

  Until time t3, since the CID of power storage device 110 is not operating, voltage VB and voltage VL are substantially maintained at time t2.

  However, when the CID of power storage device 110 is activated at time t3, the charging power from power storage device 110 to capacitor C1 is interrupted. Then, since the electric charge stored in the capacitor C1 is discharged by the resistor R1, the voltage VL decreases with time. As a result, the deviation ΔV between the voltage VB and the voltage VL increases.

  ECU 300 determines that the difference value (ΔVref−ΔV) between deviation ΔV of voltage VB and voltage VL and reference deviation ΔVref reaches a predetermined threshold value β (time t4 in FIG. 3). It is determined that 110 CID has been activated, and SMR 115 is forcibly turned off. This threshold value β is appropriately set within a range in which CID is not affected by an applied voltage (that is, a difference voltage between the voltage VB and the voltage VL).

  Thus, even when the amount of change in voltage VL due to the load is small, the operation of CID in power storage device 110 can be detected appropriately, and secondary failure can be suppressed.

  FIG. 4 is a functional block diagram for explaining CID operation detection control executed by ECU 300 in the present embodiment. Each functional block described in the functional block diagram of FIG. 4 is realized by hardware or software processing by ECU 300.

  Referring to FIGS. 1 and 4, ECU 300 includes a reference value setting unit 310, a deviation calculation unit 320, a smoothing unit 330, a determination unit 340, a relay control unit 350, and an alarm output unit 360. .

  Reference value setting unit 310 receives voltage VB and voltage VL detected by voltage sensors 111 and 124, respectively. Reference value setting unit 310 receives control signal SE1 of SMR 115, drive signal DRV (PWC, PWI1, PWI2, PWD, ACON, etc.) of load device 180, and current IB detected by current sensor 112. As described with reference to FIG. 3, the reference value setting unit 310 is the absolute value of the deviation between the voltage VB and the voltage VL at the timing when the SMR 115 becomes conductive or when the power storage device 110 is charged / discharged. A reference deviation ΔVref # (= | VB−VL |) is calculated and stored. Then, the reference value setting unit 310 outputs this reference deviation ΔVref # to the smoothing unit 330. In addition, when it has the structure which can charge (external charge) of the electrical storage apparatus 110 using the electric power from an external power supply as shown in FIG. 1, the timing when said charging / discharging is performed also during this external charge include.

  Smoothing unit 330 smoothes reference deviation ΔVref # received from reference value setting unit 310 in the time axis direction, and outputs the smoothed reference deviation ΔVref to determination unit 340. As a specific method of smoothing, for example, a moving average of the reference deviation ΔVref # during a predetermined period may be used.

  Deviation calculation unit 320 receives voltage VB and voltage VL detected by voltage sensors 111 and 124, respectively. Deviation calculation unit 320 calculates deviation ΔV between voltage VB and voltage VL, and outputs the calculation result to determination unit 340.

  The determination unit 340 receives the smoothed reference deviation ΔVref from the smoothing unit 330 and the deviation ΔV from the deviation calculation unit 320. Determination unit 340 receives drive signal DRV and current IB. Determination unit 340 calculates a difference value between smoothed reference deviation ΔVref and deviation ΔV in a state where power storage device 110 is not charged / discharged. Then, the determination unit 340 determines whether or not the difference value exceeds a predetermined threshold value, that is, whether or not the CID has been activated, and determines the determination flag FLG that is the determination result as the relay control unit 350. And output to the alarm output unit 360. For example, when it is determined that the CID is activated, the determination flag FLG is set to ON, and when it is determined that the CID is not activated, the determination flag FLG is set to OFF.

  Relay control unit 350 receives determination flag FLG from determination unit 340. Then, when it is determined that the CID is activated and the determination flag FLG is set to ON, the relay control unit 350 generates a control signal SE1 that causes the SMR 115 to be disconnected and outputs the control signal SE1 to the SMR 115. To do.

  Alarm output unit 360 receives determination flag FLG from determination unit 340. When it is determined that the CID is activated and the determination flag FLG is set to ON, the alarm output unit 360 outputs a control signal ALM to the alarm device 190 to notify the user that the CID is activated. To do.

  FIG. 5 is a flowchart for explaining details of the CID operation detection control process executed by ECU 300 in the present embodiment. In the flowchart shown in FIG. 5, the processing is realized by a program stored in advance in ECU 300 being called from the main routine and executed in a predetermined cycle. Alternatively, for some steps, processing can be realized by dedicated hardware (electronic circuit).

  Referring to FIGS. 1 and 5, ECU 300 determines in step (hereinafter, step is abbreviated as S) 100 whether or not it is immediately after SMR 115 is connected. The term “immediately after the SMR 115 is connected” may be, for example, after a predetermined short time has elapsed since the SMR 115 was connected.

  If SMR 115 has just been connected (YES in S100), ECU 300 sets the deviation between voltage VB and voltage VL at that time as an initial value of reference deviation ΔVref in S110. Then, the process proceeds to S120.

  If not immediately after SMR 115 is connected (NO in S100), ECU 300 skips S110 and advances the process to S120.

  In S120, ECU 300 determines whether charging / discharging from power storage device 110 is in progress. Specifically, ECU 300 performs charge / discharge depending on whether drive signal DRV is output to load device 180 or whether the absolute value of input / output current IB of power storage device 110 is equal to or greater than a prescribed value α. It is determined whether or not is being implemented.

  If charging / discharging from power storage device 110 is in progress (YES in S120), the process proceeds to S160, and ECU 300 uses the value obtained by smoothing the deviation between current voltage VB and voltage VL as reference deviation ΔVref. Set as. Then, the process returns to the main routine.

  If charging / discharging from power storage device 110 is not being performed (YNO in S120), the process proceeds to S130, and the difference value between stored reference deviation ΔVref and deviation ΔV between current voltage VB and voltage VL is It is determined whether or not it is greater than or equal to the threshold value β.

  If the difference value between reference deviation ΔVref and deviation ΔV is equal to or greater than threshold β value (YES in S130), the process proceeds to S140, and ECU 300 determines that the CID of power storage device 110 has been activated. In S150, ECU 300 disconnects (opens) SMR 115 and notifies alarming device 190 that the CID has been activated.

  On the other hand, when the difference value between reference deviation ΔVref and deviation ΔV is smaller than threshold value β (NO in S130), ECU 300 determines that the CID is not operating and returns the process to the main routine.

  By performing control according to the above-described process, the operation of the CID can be accurately determined even in a low load in a system including a power storage device including the CID. As a result, it is possible to quickly detect that the CID is activated, so that it is possible to prevent the occurrence of a secondary failure when the CID is activated.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 10 Charging system, 100 Vehicle, 110 Power storage device, 111, 124, 125 Voltage sensor, 112 Current sensor, 115 SMR, 120 Drive device, 121 Converter, 122, 123 Inverter, 130, 135 Motor generator, 140 Power transmission gear, 150 Drive wheel, 160 engine, 170 accessory device, 171 DC / DC converter, 172 accessory load, 173 accessory battery, 174 air conditioner, 180 load device, 190 alarm device, 200 charging device, 210 CHR, 220 connection, 300 ECU, 310 reference value setting unit, 320 deviation calculation unit, 330 smoothing unit, 340 determination unit, 350 relay control unit, 360 alarm output unit, 400 charging cable, 410 charging connector, 420 plug, 430 electric wire unit, 44 CCID, 500 external power supply, 510 outlets, ACL1, ACL2, PL1 to PL3 power line, CID current interrupting device, CL 1 to CLn battery cells, NL1, NL2 ground line, R1 resistor.

Claims (15)

A control device for a power storage device for supplying driving power to a load device,
The power storage device includes a plurality of cells connected in series,
Each of the plurality of cells includes a shut-off device configured to shut off an energization path of the power storage device that operates when an internal pressure of the power storage device exceeds a specified value.
The output voltage of the power storage device is defined as the sum of the voltages of the plurality of cells,
The control device includes:
A setting unit for setting prior Kide output voltage from said power storage device based deviation a first difference between the input voltage to the load device in a predetermined timing,
A calculation unit for calculating a second deviation between the output voltage and the input voltage after the timing;
A determination unit configured to determine whether or not the shut-off device is operating based on a comparison between a difference value between the reference deviation and the second deviation and a predetermined threshold value. Control device.   The power storage device control device according to claim 1, wherein the calculation unit calculates the second deviation while charging and discharging of the power storage device is stopped.   The determination unit determines that the shut-off device is activated when the magnitude of the difference value is greater than the threshold value, and the shut-off device is not activated when the magnitude of the difference value is less than the threshold value. The control device for a power storage device according to claim 1, wherein the control device is determined to be in operation.   4. The power storage device control device according to claim 1, wherein a capacitor connected in parallel with the power storage device is provided between input terminals of the load device. 5.   The setting unit is predetermined after a switching device provided between the power storage device and the load device is turned on to switch between conduction and non-conduction between the power storage device and the load device. The control device for a power storage device according to any one of claims 1 to 4, wherein the reference deviation is set with the deviation after a lapse of time as the first deviation.   6. The power storage device according to claim 1, wherein the setting unit sets the reference deviation with a deviation during a period during which the power storage device is being charged / discharged as the first deviation. Control device.   7. The setting unit according to claim 6, wherein the setting unit sets the reference deviation with a value obtained by smoothing a deviation during a period during which the power storage device is charged and discharged in the time axis direction as the first deviation. Control device for power storage device. The control device includes:
Provided between the power storage device and the load device to switch between conduction and non-conduction between the power storage device and the load device when the determination unit determines that the shut-off device is activated. The control apparatus of the electrical storage apparatus of any one of Claims 1-4 further provided with the control part for switching a switching apparatus to non-conduction.   The power storage device control device according to claim 2, wherein the calculation unit determines whether charging / discharging of the power storage device is stopped based on whether the load device is driven.   The power storage device control device according to claim 2, wherein the calculation unit determines whether charging / discharging of the power storage device is stopped based on a current value input to and output from the power storage device. The power storage device, the load device, and the control device are mounted on a vehicle,
The load device is:
11. The power storage device control device according to claim 1, comprising a drive device configured to generate a driving force of the vehicle using electric power from the power storage device. The load device is:
The power storage device control device according to claim 10, further comprising an auxiliary device that operates using electric power from the power storage device. A vehicle,
A power storage device;
A load device including a driving device configured to generate driving force of the vehicle using electric power from the power storage device;
A control device for controlling the power storage device,
The power storage device includes a plurality of cells connected in series,
Each of the plurality of cells includes a shut-off device configured to shut off an energization path of the power storage device that operates when an internal pressure of the power storage device exceeds a specified value.
The output voltage of the power storage device is defined as the sum of the voltages of the plurality of cells,
The control device includes:
A setting unit for setting prior Kide output voltage from said power storage device based deviation a first difference between the input voltage to the load device in a predetermined timing,
A calculation unit for calculating a second deviation between the output voltage and the input voltage after the timing;
A vehicle including a determination unit configured to determine whether or not the shut-off device is activated based on a comparison between a difference value between the reference deviation and the second deviation and a predetermined threshold value; A control method for a power storage device for supplying driving power to a load device,
The power storage device includes a plurality of cells connected in series,
Each of the plurality of cells includes a shut-off device configured to shut off an energization path of the power storage device that operates when an internal pressure of the power storage device exceeds a specified value.
The output voltage of the power storage device is defined as the sum of the voltages of the plurality of cells,
The control method is:
Setting a first deviation between the input voltage to the load device before Kide output voltage from said power storage device in a predetermined timing as a reference deviation,
Calculating a second deviation between the output voltage and the input voltage after the timing;
And a step of determining whether or not the shut-off device is activated based on a comparison between a difference value between the reference deviation and the second deviation and a predetermined threshold value.   Provided between the power storage device and the load device to switch between conduction and non-conduction between the power storage device and the load device when it is determined in the determination step that the shut-off device is activated. The method for controlling a power storage device according to claim 14, further comprising a step of switching the switching device to a non-conduction state.

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