JP2024022677A - battery control device - Google Patents

Abstract

To provide a battery control device which is applied to a power supply system including a switch that switches an electrical connection between a storage cell and an electric apparatus, and in which a time required until the switch is switched to an ON-state can be shortened.SOLUTION: The battery control device includes respective monitoring devices 40a to 40c and a battery ECU 50. The respective monitoring devices 40a to 40c monitor a state of a battery pack 20 including a voltage of the battery pack 20. The battery ECU 50 instructs an ON-state or OFF-state of main relays 16, 17. The respective monitoring devices 40a to 40c diagnose whether or not an abnormality occurs in at least one of the battery pack 20 and the respective monitoring devices 40a to 40c, store a diagnostic result, and transmit the stored diagnostic result to the battery ECU 50 in a period in which the main relays 16, 17 are in the OFF-state. The battery ECU 50 instructs switching of the main relays 16, 17 to the ON-state based on the received diagnostic result.SELECTED DRAWING: Figure 1

Description

The present invention relates to a battery control device.

Patent Document 1 discloses a power supply system including a storage battery that supplies power to electrical equipment. This power supply system includes a battery control device that monitors the voltage or temperature of the storage battery and controls charging and discharging of the storage battery based on the monitored voltage or temperature of the storage battery.

JP2018-81837A

By the way, some power supply systems include a switch that switches electrical connection between a storage battery and an electric device. In such a power supply system, by turning on a switch, a storage battery is electrically connected to an electrical device, and power from the storage battery is supplied to the electrical device.

For example, if the switch is turned on when an abnormality has occurred in the storage battery, there is a risk that problems will occur in the exchange of power between the electrical equipment and the storage battery. Therefore, it is conceivable to diagnose whether or not there is an abnormality in the storage battery based on the monitoring results of the storage battery, and to turn the switch on if there is no abnormality in the storage battery. However, if a storage battery diagnosis is performed after receiving a request to turn the switch on, the switch will be turned on after receiving the request to turn the switch on for the time required for diagnosis. There is a concern that it will take a long time to switch.

The present invention has been made in view of the above-mentioned problems, and is provided in a battery control device applied to a power supply system equipped with a switch that changes the electrical connection between a storage battery and an electrical device. It is an object of the present invention to provide a battery control device that can reduce time.

The present invention relates to a storage battery, an electrical device, and an electrical connection between the storage battery and the electrical device when turned on, and an electrical disconnection between the storage battery and the electrical device when turned off. A battery control device applied to a power supply system comprising a switch that
a monitoring unit that monitors the state of the storage battery including the voltage of the storage battery;
a control unit that instructs the switch to be in an on state or an off state;
Equipped with
The monitoring unit diagnoses whether an abnormality has occurred in at least one of the storage battery and the monitoring unit, and stores the diagnosis result,
The monitoring unit transmits the stored diagnosis result to the control unit during a period when the switch is in an off state,
The control unit instructs the switch to be turned on based on the received diagnosis result.

Thereby, the time required until the switch is turned on can be shortened.

Note that the battery control device can have, for example, the following configuration.

A first configuration includes a storage battery (20), an electric device (10), and when turned on, the storage battery and the electric device are electrically connected, and when turned off, the storage battery and the electric device are electrically connected. A battery control device (30) applied to a power supply system (100) including a switch (16, 17) that electrically disconnects electrical equipment,
a monitoring unit (40a to 40c) that monitors the state of the storage battery including the voltage of the storage battery;
a control unit (50) that instructs the switch to be in an on state or an off state;
Equipped with
The monitoring unit diagnoses whether an abnormality has occurred in at least one of the storage battery and the monitoring unit in a period before receiving the connection request signal from the control unit, and stores the diagnosis result,
The control unit transmits the connection request signal to the monitoring unit when the on-state of the switch is requested;
The monitoring unit transmits the stored diagnosis result to the control unit when receiving the connection request signal,
If the control unit determines that the abnormality has not occurred based on the received diagnosis result, the control unit instructs the switch to be turned on, and if it determines that the abnormality has occurred, the control unit instructs the switch to turn on. does not instruct the switch to be turned on.

In the second configuration, in the first configuration,
The control unit includes:
If it is determined that the abnormality has occurred based on the diagnosis result, the monitoring unit obtains a monitoring result of the state of the storage battery, and determines whether or not the abnormality has occurred based on the obtained monitoring result. Determine,
If it is determined that the abnormality has not occurred, an instruction is given to turn on the switch.

In the third configuration, in the first or second configuration,
The monitoring unit diagnoses an over-discharge state and an over-charge state of the storage battery as the abnormality,
If the received diagnostic result indicates that the battery is not over-discharged, the control unit instructs the switch to be turned on, regardless of whether the diagnostic result indicates that the battery is over-charged.

In the fourth configuration, in the third configuration,
The electrical device is an inverter (10) connected to a rotating electrical machine (200),
The inverter has a function of converting AC power generated by the rotating electrical machine into DC power and charging the storage battery with the converted DC power,
The control unit prohibits charging of the storage battery via the inverter when the received diagnosis result indicates that the battery is not in an over-discharge state and is in an over-charge state.

The fifth configuration is any one of the first to fourth configurations,
The monitoring unit and the control unit can be wirelessly connected via each other's wireless communication units (44, 51),
The control unit requests wireless connection from the monitoring unit by transmitting the connection request signal to the monitoring unit when startup of the power supply system is requested;
The monitoring unit wirelessly transmits the stored diagnosis result to the control unit via a wireless connection established with the control unit.

The sixth configuration is any one of the first to fifth configurations,
The monitoring unit stores a diagnosis result as to whether or not an abnormality has occurred in at least one of the storage battery and the monitoring unit as binary information.

A configuration diagram of a power supply system. FIG. 3 is a diagram illustrating the configuration of a monitoring IC. Flowchart explaining periodic diagnosis. 5 is a flowchart illustrating a procedure for a battery ECU to receive diagnosis results. 2 is a flowchart illustrating a procedure for operating a main relay. 5 is a flowchart illustrating the procedure of processing performed between the battery ECU and the first to third monitoring devices. 7 is a flowchart illustrating the procedure of periodic diagnosis according to the second embodiment.

<First embodiment>
DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a power supply system according to the present invention will be described below with reference to the drawings. The power supply system of this embodiment is mounted on a vehicle.

The power supply system 100 shown in FIG. 1 includes an inverter 10, an assembled battery 20, a battery control device 30, and a rotating electric machine 200. In this embodiment, the inverter 10 corresponds to an electrical device, and the assembled battery 20 corresponds to a storage battery.

The rotating electrical machine 200 is a three-phase AC motor having U, V, and W phase armature windings. The U-phase output terminal 11 of the inverter 10 is connected to the U-phase armature winding of the rotating electric machine 200, the V-phase output terminal 12 is connected to the V-phase armature winding, and the W-phase output terminal 13 is connected to the W-phase armature winding. The first input terminal 14 of the inverter 10 is connected to the positive terminal of the battery pack 20, and the second input terminal 15 is connected to the negative terminal of the battery pack 20.

The assembled battery 20 includes a plurality of unit batteries 22 connected in series. Specifically, the assembled battery 20 is configured by a plurality of battery modules 21a, 21b, and 21c each including two or more unit batteries 22 connected in series by a conductive member such as an inter-module wire. Hereinafter, among the battery modules constituting the assembled battery 20, the one on the high potential side is referred to as the first module 21a, the one on the intermediate potential side is referred to as the second module 21b, and the one on the low potential side is referred to as the third module 21c. It is called.

A first main relay 16 as a switch is provided in the wiring connecting the first input terminal 14 of the inverter 10 and the positive terminal of the assembled battery 20. Further, a second main relay 17 as a switch is provided in the wiring connecting the second input terminal 15 of the inverter 10 and the negative terminal of the assembled battery 20. In this embodiment, the first and second main relays 16 and 17 are normally open relays. When the first and second main relays 16 and 17 are in the off state, the assembled battery 20 and the inverter 10 are not electrically connected.

On the other hand, when the first and second main relays 16 and 17 are in the on state, the assembled battery 20 and the inverter 10 are electrically connected. During power running, inverter 10 converts DC power from battery pack 20 into AC power, and drives rotary electric machine 200 with the converted AC power. During regenerative power generation, the alternating current generated by the regenerative power generation of the rotating electrical machine 200 is converted into direct current power by the inverter 10, and the assembled battery 20 is charged with the converted direct current power.

The battery control device 30 includes a first monitoring device 40a, a second monitoring device 40b, a third monitoring device 40c, and a battery ECU 50. The first monitoring device 40a monitors the battery condition including the voltage and temperature of the first module 21a. The second monitoring device 40b monitors the battery condition including the voltage and temperature of the second module 21b. The third monitoring device 40c monitors the battery condition including the voltage and temperature of the third module 21c. The first to third monitoring devices 40a to 40c correspond to a monitoring section.

Next, the configuration of the first monitoring device 40a will be explained. The first monitoring device 40a includes a monitoring IC 41, a first control section 42, a storage section 43, and a slave communication section 44. Note that the configurations of the second monitoring device 40b and the third monitoring device 40c are the same as those of the first monitoring device 40a, so detailed description thereof will be omitted.

The monitoring IC 41 is connected to the positive electrode side and the negative electrode side of each unit battery 22 that constitutes the first module 21a. Specifically, as shown in FIG. 2, each positive side port 65 of the monitoring IC 41 is connected to the positive side of each unit battery 22, and each negative side port 66 is connected to the negative side of each unit battery 22. ing.

The monitoring IC 41 includes a multiplexer (MUX) 61 , a positive electrical path 62 , a negative electrical path 63 , an equalization circuit 64 , and a voltage detection section 67 . The first end of the positive electrical path 62 is connected to the positive port 65, and the second end is connected to the positive input terminal 61a of the MUX 61. The first end of the negative electrical path 63 is connected to the negative port 66, and the second end is connected to the negative input terminal 61b of the MUX 61. That is, the MUX 61 is connected to the positive electrode side of each unit battery 22 via each positive electrode side port 65 and to the negative electrode side of each unit battery 22 via each negative electrode side port 66. The MUX 61 selectively connects each port 65 , 66 connected to any one of the unit batteries 22 to the voltage detection section 67 . The voltage detection section 67 includes a differential amplifier circuit, an AD converter, and the like, and detects the voltage difference between the selected unit battery 22 and each of the electrical paths 62 and 63 connected to it as a cell voltage VC.

The equalization circuit 64 includes a discharge switch SW that connects the positive electrical path 62 and the negative electrical path 63. When the discharge switch SW is turned on, a closed circuit including the positive electrode side electrical path 62, the negative electrode side electrical path 63, the unit battery 22, and the discharge switch SW is formed, and the unit battery 22 is discharged. be able to.

Further, the battery ECU 50 includes a parent device side communication section 51 and a second control section 52. The second control unit 52 mainly includes a microcomputer including a CPU, ROM, RAM, and the like. The first control section 42 of each of the monitoring devices 40a to 40c can be wirelessly connected to the battery ECU 50 via the slave communication section 44 and the master communication section 51. The second control unit 52 can be wirelessly connected to the first control unit 42 of each of the monitoring devices 40a to 40c via the parent device communication unit 51 and the slave communication unit 44 of each of the monitoring devices 40a to 40c. There is.

The cell voltage VC detected by the monitoring IC 41 is input to the first control section 42 . The first control unit 42 mainly includes a microcomputer including a CPU, ROM, RAM, and the like. The first control unit 42 detects the battery voltage VB, which is the voltage of the first module 21a, by adding together the cell voltages VC of all the unit batteries 22 constituting the first module 21a. The first control unit 42 also has a function of calculating the SOC (State of Charge) of the first module 21a.

The second control unit 52 makes the relay operation signals Q of the first and second main relays 16 and 17 an ON command or an OFF command. The second control unit 52 turns on the relay operation signal Q on the condition that the activation request signal is received from the host ECU 60. The activation request signal is generated, for example, in response to a activation operation by a vehicle user. In this embodiment, the starting operation is when the vehicle user turns on the start switch of the vehicle while the vehicle is stopped and the in-vehicle main engine is not started. When the relay operation signal Q is an ON command, the first and second main relays 16 and 17 are turned on, and the assembled battery 20 and the inverter 10 are electrically connected. On the other hand, when the relay operation signal Q is an off command, the first and second main relays 16 and 17 are turned off, and the assembled battery 20 and the inverter 10 are electrically disconnected.

The second control unit 52 has a function of calculating the SOC of each module 21a to 21c based on information wirelessly transmitted from the first to third monitoring devices 40a to 40c. The second control unit 52 calculates the discharge amount of the first to third modules 21a to 21c so that the variation in SOC among the first to third modules 21a to 21c is reduced. Then, the second control unit 52 wirelessly transmits the calculated discharge amounts for each of the first to third modules 21a to 21c to the first to third monitoring devices 40a to 40c via the parent device communication unit 51. Thereby, each first control section 42 of the first to third monitoring devices 40a to 40c controls the first to third modules 21a by turning on and off the discharge switch SW of the equalization circuit 64 according to the amount of discharge. Reduce the variation in SOC between 21c and 21c.

Here, if an abnormality has occurred in at least one of the first to third modules 21a to 21c, the first and second main relays 16 and 17 are turned on in response to a startup request signal from the host ECU 60. If it is stored away, for example, there is a risk that problems may arise in the transfer of power between the inverter 10 and the assembled battery 20. Therefore, before turning on the first and second main relays 16 and 17, an abnormality in the assembled battery 20 is diagnosed, and when it is diagnosed that there is no abnormality in the assembled battery 20, the first and second main relays It is necessary to turn on the two main relays 16 and 17. However, when an abnormality diagnosis is performed on the first to third modules 21a to 21c after a startup request is made to the vehicle, the first and second main relays 16 , 17 is delayed. In particular, when wireless communication is used as a communication method between each of the monitoring devices 40a to 40c and the battery ECU 50, time is required to establish the wireless connection, so the first and second main relays 16 and 17 are turned on. There is a concern that the timing to start switching to the state will be significantly delayed.

Therefore, the first to third monitoring devices 40a to 40c monitor the assembled battery during a period when no activation request is made to the power supply system 100 and the first and second main relays 16 and 17 are in the off state. Diagnose the presence or absence of 20 abnormalities. Then, when a startup request is made to the power supply system, the first to third monitoring devices 40a to 40c transmit the diagnostic results obtained in advance to the battery ECU 50. The battery ECU 50 determines whether to switch the first and second main relays 16 and 17 to the on state according to the diagnosis result of the assembled battery 20.

First, periodic diagnosis, which is a diagnosis performed by the first to third monitoring devices 40a to 40c, will be explained. In this embodiment, the first to third monitoring devices 40a to 40c perform a first diagnosis to diagnose the voltage status of the first to third modules 21a to 21c, and a second diagnosis to diagnose whether there is an abnormality in the first to third monitoring devices 40a to 40c, as periodic diagnostics. 2. Perform a diagnosis. The second diagnosis is performed in consideration of the fact that the results of voltage monitoring of the first to third modules 21a to 21c may show an abnormal value due to an abnormality on the side of the first to third monitoring devices 40a to 40c.

The first to third monitoring devices 40a to 40c diagnose whether the first to third modules 21a to 21c are in an overcharged state or an overdischarged state by a first diagnosis. For example, if the SOC of the first module 21a exceeds the upper limit of a predetermined range, it may be diagnosed that the first module 21a is in an overcharged state. Further, for example, if the SOC of the first module 21a is below the lower limit of a predetermined range, it may be diagnosed that the first module 21a is in an overdischarge state.

The first to third monitoring devices 40a to 40c diagnose whether there is any abnormality in themselves through the second diagnosis. Its own abnormalities include the presence or absence of an abnormality in the monitoring IC 41 and a sticking abnormality in the discharge switch SW.

The procedure of periodic diagnosis performed by each of the monitoring devices 40a to 40c will be explained using FIG. 3. The processing shown in FIG. 3 is performed by each of the monitoring devices 40a to 40c. Note that the periodic diagnosis carried out by the second and third monitoring devices 40b and 40c is the same process as the periodic diagnosis carried out by the first monitoring device 40a. Therefore, in FIG. 3, the first monitoring device 40a will be explained as an example.

In step S10, it is determined whether a connection request signal has been received. The connection request signal is a signal sent from the battery ECU 50 to the first to third monitoring devices 40a to 40c to request wireless connection. If the connection request signal has not been received, a negative determination is made in step S10, and the process of FIG. 3 is temporarily terminated. On the other hand, if a connection request signal is received, the process advances to step S11.

In step S11, it is determined whether the first module 21a is in an overcharged state. If an affirmative determination is made in step S11, the process proceeds to step S12, where the overcharge state flag HV indicating that the first module 21a is in an overcharge state is set to 1.

If a negative determination is made in step S11, the process proceeds to step S13 and the overcharge state flag HV is set to zero. In the following step S14, it is determined whether the first module 21a is in an over-discharge state. If an affirmative determination is made in step S13, the process proceeds to step S15, where the over-discharge state flag LV indicating that the first module 21a is in an over-discharge state is set to 1. On the other hand, if a negative determination is made in step S14, the process proceeds to step S16 and the overdischarge state flag LV is set to zero. Steps S11 to S16 correspond to the first diagnosis.

When the processes of steps S12, S15, and S16 are completed, the process advances to step S17. In step S17, it is determined whether or not there is an abnormality in the first monitoring device 40a. If an affirmative determination is made in step S17, the process proceeds to step S18, and the monitoring abnormality flag SLFC, which indicates that there is an abnormality in the first monitoring device 40a, is set to 1. On the other hand, if a negative determination is made in step S17, the process proceeds to step S19, and the monitoring abnormality flag SLFC is set to 0. Steps S17 to S19 correspond to the second diagnosis.

In step S20, the overcharge state flag HV, overdischarge state flag LV, and monitoring abnormality flag SLFC are stored in the storage unit 43. Hereinafter, the overcharge state flag HV, overdischarge state flag LV, and monitoring abnormality flag SLFC stored in the storage unit 43 will be referred to as diagnosis result flags.

Next, a procedure for the battery ECU 50 to receive the diagnosis results of the periodic diagnosis will be explained using FIG. 4. The process shown in FIG. 4 is performed between battery ECU 50 and each monitoring device 40a to 40c. Note that the processing performed by the second and third monitoring devices 40b and 40c is similar to the processing performed by the first monitoring device 40a. Therefore, in FIG. 4, the first monitoring device 40a will be explained as an example. The process shown in FIG. 4 is performed on the condition that battery ECU 50 receives a start request signal from host ECU 60.

In step S21, a connection request signal is transmitted to the first monitoring device 40a. In step S22, it is determined whether a predetermined time has elapsed since the connection request signal was transmitted. If the predetermined time has not elapsed since transmitting the connection request signal, the process advances to step S23, and it is determined whether a response signal from the first monitoring device 40a has been received. The response signal is a signal sent back through the base unit side communication unit 51 when wireless connection between the battery ECU 50 and the base unit side communication unit 51 is permitted. If no response signal has been received from the first monitoring device 40a, the process returns to step S22.

In step S30, the first monitoring device 40a determines whether a connection request signal has been received from the battery ECU 50. When the connection request signal is received, the process proceeds to step S31, and among the diagnosis result flags stored in the storage unit 43, the values of the overdischarge state flag LV and the monitoring abnormality flag SLFC are referred to. If the overdischarge state flag LV and the monitoring abnormality flag SLFC are both 0, an affirmative determination is made in step S31, and the process proceeds to step S32. In step S32, a response signal is sent back to the battery ECU 50.

When the battery ECU 50 determines in step S23 that the response signal has been received, the process proceeds to step S24. In step S24, a connection establishment process for establishing a wireless connection is performed between the base unit side communication unit 51 and the slave unit side communication unit 44. In this connection establishment process, for example, a pairing process is performed in which the base unit side communication unit 51 and the slave unit side communication unit 44 authenticate each other.

The first monitoring device 40a performs connection establishment processing in step S33. Thereafter, in step S34, the diagnosis result flag is wirelessly transmitted to the battery ECU 50 through the wireless connection established between the parent unit side communication unit 51 and the slave unit side communication unit 44. In this embodiment, an over-discharge state flag LV, an over-charge state flag HV, and a monitoring abnormality flag SLFC are wirelessly transmitted as diagnosis result flags. Then, the process in FIG. 4 is temporarily ended.

In step S25, the battery ECU 50 receives the diagnosis result flag from the first monitoring device 40a. In step S26, it is determined whether diagnosis result flags have been received from all the monitoring devices 40a to 40c. When an affirmative determination is made in step S26, the process proceeds to step S27, and relay operation processing for operating the first and second main relays 16 and 17 is performed. Note that if a negative determination is made in step S26, the process in FIG. 4 is temporarily ended.

Note that in the first monitoring device 40a, if it is determined in step S31 that at least one of the overdischarge state flag LV and the monitoring abnormality flag SLFC is 1, the process of FIG. 4 is temporarily ended. In this case, the diagnostic result flag is not wirelessly transmitted to battery ECU 50.

In step S21, when a predetermined period of time has elapsed since the connection request signal was sent without receiving a response signal from the first monitoring device 40a, the battery ECU 50 sets the provisional abnormality determination flag F to 1 in step S28. . The provisional abnormality determination flag F is information indicating whether or not it has been diagnosed that an abnormality has occurred in the first to third modules 21a to 21c through periodic diagnosis by the first to third monitoring devices 40a to 40c. If it is diagnosed that an abnormality has occurred in the first to third modules 21a to 21c, the provisional abnormality determination flag F is set to 1. If it is not diagnosed that an abnormality has occurred in the first to third modules 21a to 21c, the provisional abnormality determination flag is set to 0. When proceeding to step S28, the process of FIG. 4 is temporarily ended without changing the relay operation signal Q to the ON command.

Next, the procedure of the relay operation process carried out in step S27 of FIG. 4 will be explained using FIG. 5. In step S41, the relay operation signal Q is changed to an ON command while charging of the assembled battery 20 via the inverter 10 is prohibited. This means that even if at least one of the first to third modules 21a to 21c is in an overcharged state, if charging of the assembled battery 20 is prohibited, there will be no inconvenience in power supply from the assembled battery 20 to the inverter 10. This is because it will never occur. For example, charging of the assembled battery 20 via the inverter 10 is prohibited for the host ECU 60 by setting the voltage command value of the inverter 10 to 0 during regenerative power generation.

In step S42, it is determined whether all overcharge state flags HV corresponding to the first to third monitoring devices 40a to 40c are 0 or not. If all the overcharge state flags HV corresponding to the first to third monitoring devices 40a to 40c are 0, the process advances to step S43, and the inhibition of charging of the assembled battery 20 is canceled. On the other hand, if all the overcharge state flags HV corresponding to the first to third monitoring devices 40a to 40c are not 0, the process in FIG. 5 is temporarily ended.

Next, the process performed between the battery ECU 50 and each of the monitoring devices 40a to 40c when the battery ECU 50 determines that the assembled battery 20 is temporarily abnormal will be described using FIG. The process shown in FIG. 6 is performed between battery ECU 50 and each monitoring device 40a to 40c. Note that the processing performed by the second and third monitoring devices 40b and 40c is similar to the processing performed by the first monitoring device 40a. Therefore, in FIG. 6, the first monitoring device 40a will be explained as an example.

In step S50, battery ECU 50 determines whether temporary abnormality determination flag F is 1 or not. If the temporary abnormality determination flag F is 1, the process advances to step S51. In step S51, a connection request signal is transmitted to the first monitoring device 40a.

If the first monitoring device 40a determines in step S60 that the connection request signal from the battery ECU 50 has been received, the process proceeds to step S61 and transmits a response signal to the battery ECU 50.

In step S52, when a response signal from the first monitoring device 40a is received, in steps S53 and S62, a connection establishment process is performed to establish a wireless connection between the base unit side communication unit 51 and the slave unit side communication unit 44. Implement.

In step S54, a monitoring request signal for monitoring the state of the first module 21a is wirelessly transmitted to the first monitoring device 40a. Upon receiving the monitoring request signal from the battery ECU 50 in step S63, the process proceeds to step S64, where the first monitoring device 40a monitors the first module 21a. In this embodiment, the voltage of the first module 21a is monitored. Note that in step S64, in addition to monitoring the voltage of the first module 21a, an abnormality in the first monitoring device 40a may be monitored.

In step S65, the monitoring results are wirelessly transmitted to the battery ECU 50. In step S55, the battery ECU 50 receives the monitoring results from the first monitoring device 40a.

In step S56, the presence or absence of an abnormality is determined by referring to all monitoring results corresponding to the first to third monitoring devices 40a to 40c. In this embodiment, the over-discharge state and over-charge state of the first to third modules 21a to 21c are determined using the monitoring results. If it is determined that no abnormality has occurred in any of the first to third modules 21a to 21c, the process proceeds to step S57, and the provisional abnormality determination flag F is changed from 1 to 0. As a result, the temporary abnormality in the assembled battery 20 is released.

In step S58, the relay operation signal Q is changed from an off command to an on command. As a result, the first and second main relays 16 and 17 are turned on, and the assembled battery 20 is electrically connected to the inverter 10.

On the other hand, if it is determined in step S56 that an abnormality has occurred in at least one of the first to third modules 21a to 21c, the process advances to step S59. In step S59, it is determined that an abnormality has occurred in the assembled battery 20. In this case, since the relay operation signal Q is maintained at the off command, the assembled battery 20 is not electrically connected to the inverter 10, and activation of the power supply system 100 is prohibited. Once the process of step S58 or step S59 is executed, the process of FIG. 6 is temporarily ended.

The present embodiment described above can have the following effects.

- When the first to third monitoring devices 40a to 40c receive a connection request signal from the battery ECU 50, they transmit the stored diagnosis result flag to the battery ECU 50. If the battery ECU 50 does not determine that the assembled battery 20 is abnormal based on the received diagnostic result flag, it instructs the first and second main relays 16 and 17 to be switched to the on state, and determines whether the assembled battery 20 is abnormal. If it is determined, the first and second main relays 16 and 17 are not instructed to switch to the on state, but are maintained in the off state. Thereby, it is possible to shorten the time required from when the activation request signal is transmitted from the ECU 60 to the battery ECU 50 until switching to the on state of the first and second main relays 16 and 17 is started.

- If the battery ECU 50 determines that an abnormality has occurred in the assembled battery 20 based on the diagnosis result flag, the battery ECU 50 monitors the states of the first to third modules 21a to 21c by the first to third monitoring devices 40a to 40c. Obtain monitoring results. Then, when it is determined that no abnormality has occurred in the assembled battery 20 based on the obtained monitoring results, an instruction is given to switch the first and second main relays 16 and 17 to the on state. As a result, even if the first to third monitoring devices 40a to 40c once determine that an abnormality has occurred in the assembled battery 20, the battery ECU 50 determines whether or not an abnormality has occurred in the assembled battery 20. By doing so, it is possible to prevent the assembled battery 20 from being electrically connected to the inverter 10 as much as possible.

- When the diagnosis result is not an over-discharge state, the battery ECU 50 transmits a response signal from the monitoring device to the battery ECU 50, regardless of whether the diagnosis result is an over-charge state. Thereby, it is possible to prevent the assembled battery 20 from being electrically connected to the inverter 10 as much as possible.

- The battery ECU 50 prohibits charging of the assembled battery 20 via the inverter 10 when the received diagnosis result indicates that the battery is not in an over-discharge state and is in an over-charge state. Thereby, it is possible to prevent the assembled battery 20 from being electrically connected to the inverter 10 as much as possible, and to avoid excessive charging of the assembled battery 20.

- The first to third monitoring devices 40a to 40c store diagnostic results as to whether or not an abnormality has occurred in the assembled battery 20 and the first to third monitoring devices 40a to 40c as flags (binary information). Thereby, the first to third monitoring devices 40a to 40c can reduce the time required to determine whether or not to establish a wireless connection even when a connection request is made from the battery ECU 50.

<Modified example of the first embodiment>
The first to third monitoring devices 40a to 40c may perform only a first diagnosis for diagnosing voltage abnormalities in the first to third modules 21a to 21c as a periodic diagnosis. In this case, in step S31 of FIG. 4, if the overdischarge state flag LV is 0, the first to third monitoring devices 40a to 40c set the overdischarge state flag LV and the overcharge state flag HV in step S34. Just send it.

<Second embodiment>
In the second embodiment, configurations that are different from the first embodiment will be mainly described. In addition, the structure which attached the same code|symbol as 1st Embodiment shows the same structure, and the description is not repeated.

In this embodiment, the first to third monitoring devices 40a to 40c perform periodic diagnosis in response to a monitoring request from the battery ECU 50.

FIG. 7 is a flowchart illustrating processing performed between the battery ECU 50 and each of the monitoring devices 40a to 40c in the second embodiment. The process shown in FIG. 7 is performed between battery ECU 50 and each monitoring device 40a to 40c. Note that the periodic diagnosis carried out by the second and third monitoring devices 40b and 40c is the same process as the periodic diagnosis carried out by the first monitoring device 40a. Therefore, in FIG. 7, the first monitoring device 40a will be explained as an example.

In step S80, it is determined whether an activation request signal from the host ECU 60 has been received. If the activation request signal has not been received, the process advances to step S81, and a connection request signal is transmitted to the first monitoring device 40a. In step S80, if an activation request signal is received from the host ECU 60, the process of FIG. 7 is temporarily ended.

In step S90, the first monitoring device 40a determines whether a connection request signal is received from the battery ECU 50. If the connection request signal has been received, the process advances to step S91 and a response signal is transmitted to the battery ECU 50.

If it is determined in step S82 that a response signal has been received, a connection establishment process for establishing a wireless connection is performed in steps S83 and S92. In step S84, a diagnosis request signal is transmitted to the first monitoring device 40a. As a result, the first monitoring device 40a performs periodic diagnosis in steps S11 to S19. Then, in step S20, the diagnosis result flag is stored in the storage unit 43.

In step S85, the battery ECU 50 requests the first monitoring device 40a to cancel the wireless connection. The first monitoring device 40a releases the wireless connection with the battery ECU 50 in step S93.

The present embodiment described above can also achieve the same effects as the first embodiment.

<Other embodiments>
- When the first to third monitoring devices 40a to 40c diagnose that there is an abnormality in the first to third modules 21a to 21c or themselves through periodic diagnosis, the first to third monitoring devices 40a to 40c will change the diagnosis content of the periodic diagnosis in the next periodic diagnosis. may be changed to a diagnostic standard that makes it easier to diagnose an abnormality than the previous one.

- The battery ECU 50 and the first to third monitoring devices 40a to 40c may be connected by wire. In this case, the processes in steps S24 and S33 in FIG. 4, the processes in steps S53 and S62 in FIG. 6, and the processes in steps S83 and S92 in FIG. 7 may be deleted.

- The number of modules that constitute the assembled battery 20 is not limited to three. When the assembled battery 20 is configured with a number of battery modules other than three, the battery control device 30 only needs to include the number of monitoring devices corresponding to each module.

- The electrical device is not limited to the inverter 10.

DESCRIPTION OF SYMBOLS 10... Inverter, 16, 17... 1st, 2nd main relay, 20... Assembled battery, 21a-21c... 1st - 3rd module, 30... Battery control device, 40a-40c... 1st - 3rd monitoring device, 50... Battery ECU, 100... Power supply system, 200... Rotating electric machine.

Claims (25)

A storage battery (20), an electric device (10), and when turned on, the storage battery and the electric device are electrically connected, and when turned off, the storage battery and the electric device are electrically connected. A battery control device (30) applied to a power supply system (100) equipped with a switch (16, 17) that shuts off the battery,
a monitoring unit (40a to 40c) that monitors the state of the storage battery including the voltage of the storage battery;
a control unit (50) that instructs the switch to be in an on state or an off state;
Equipped with
The monitoring unit diagnoses whether an abnormality has occurred in at least one of the storage battery and the monitoring unit, and stores the diagnosis result,
The monitoring unit transmits the stored diagnosis result to the control unit during a period when the switch is in an off state,
The control unit is a battery control device, wherein the control unit instructs the switch to be turned on based on the received diagnosis result. The monitoring unit and the control unit can be wirelessly connected via each other's wireless communication units (44, 51),
The control unit transmits a connection request signal to the monitoring unit,
When the monitoring unit receives the connection request signal, the monitoring unit determines whether or not to perform a connection establishment process for mutually authenticating the monitoring unit and the control unit based on the stored diagnosis result. , The battery control device according to claim 1. After a wireless connection is established with the monitoring unit through the connection establishment process, the monitoring unit stores information before the control unit determines whether to instruct the switch to be turned on. The battery control device according to claim 2, wherein the battery control device transmits the diagnosis result obtained by determining the diagnosis result to the control unit. After a wireless connection is established with the monitoring unit by the connection establishment process, the control unit causes the storage battery to be monitored before determining whether to instruct the switch to be turned on. transmitting a monitoring request signal to the monitoring unit;
The battery control device according to claim 2, wherein the monitoring unit monitors the state of the storage battery when receiving the monitoring request signal. The monitoring unit diagnoses whether or not an abnormality has occurred in the storage battery after receiving the connection request signal transmitted from the control unit during a period in which the switch is in an off state, and stores the diagnosis result. The battery control device according to claim 2. When the control unit determines that the abnormality has not occurred based on the received diagnosis result, the control unit changes the switch to an on state without transmitting a monitoring request signal for monitoring the storage battery to the monitoring unit. The battery control device according to any one of claims 1 to 5, which instructs switching to. The battery control according to any one of claims 1 to 6, wherein the monitoring unit, when diagnosing that the abnormality has occurred, changes diagnostic criteria for the next time diagnosis as to whether or not the abnormality has occurred. Device. The control unit sets an operation signal of the switch to an ON command to turn the switch on, and sets the operation signal to an OFF command to turn the switch to an OFF state,
The monitoring unit transmits the stored diagnosis result to the control unit during a period when the operation signal is an off command and the switch is in an off state,
The battery control device according to claim 1, wherein the control unit switches the operation signal to an ON command based on the received diagnosis result. The power supply system is mounted on a vehicle,
The battery control device according to claim 8, wherein the control unit changes the operation signal from an off command to an on command on condition that a user of the vehicle turns on a start switch of the vehicle. The monitoring unit and the control unit can be wirelessly connected via each other's wireless communication units (44, 51),
The control unit transmits a connection request signal to the monitoring unit,
When the monitoring unit receives the connection request signal, the monitoring unit determines whether or not to perform a connection establishment process for mutually authenticating the monitoring unit and the control unit based on the stored diagnosis result. 10. The battery control device according to claim 8 or 9. After a wireless connection is established with the monitoring unit through the connection establishment process, the monitoring unit may transmit the stored information before the control unit determines whether or not to switch the operation signal to an on command. The battery control device according to claim 10, wherein a diagnosis result is transmitted to the control unit. The monitoring unit and the control unit can be wirelessly connected via each other's wireless communication units (44, 51),
The control unit transmits a connection request signal to the monitoring unit,
The monitoring unit transmits a response signal to the control unit on the condition that the connection request signal is received;
If the control unit does not receive the response signal within a predetermined period of time after transmitting the connection request signal, the control unit transmits the connection request signal again to the monitoring unit;
When the monitoring unit receives the retransmitted connection request signal, the monitoring unit transmits a response signal to the control unit, and when the transmitted response signal is received by the control unit, the monitoring unit transmits a response signal to the control unit and The monitoring unit performs a connection establishment process for establishing a wireless connection between the control unit and the monitoring unit,
After a wireless connection is established with the monitoring unit through the connection establishment process, the control unit issues a monitoring request for monitoring the storage battery before determining whether to switch the operation signal to an on command. transmitting a signal to the monitoring unit;
The battery control device according to claim 8, wherein the monitoring unit monitors the state of the storage battery when receiving the monitoring request signal. The monitoring unit and the control unit can be wirelessly connected via each other's wireless communication units (44, 51),
The control unit transmits a connection request signal to the monitoring unit during a period when the operation signal is an off command and the switch is in an off state,
The monitoring unit determines whether an abnormality has occurred in the storage battery after receiving the connection request signal transmitted from the control unit during a period in which the operation signal is an OFF command and the switch is in the OFF state. The battery control device according to claim 8, which diagnoses the battery and stores the diagnosis result. The battery control according to claim 8 or 9, wherein the monitoring unit transmits the stored diagnosis result to the control unit before the control unit determines whether to switch the operation signal to an on command. Device. The control unit transmits a monitoring request signal for monitoring the storage battery to the monitoring unit before determining whether to switch the operation signal to an on command,
The battery control device according to claim 8 or 9, wherein the monitoring unit monitors the state of the storage battery when receiving the monitoring request signal. 9. The monitoring unit diagnoses whether or not an abnormality has occurred in the storage battery during a period in which the operation signal is an off command and the switch is in the off state, and stores the diagnosis result. 9. The battery control device according to 9. When the control unit determines that an abnormality has occurred in the storage battery based on the received diagnosis result, the control unit maintains the operation signal as an OFF command and electrically disconnects the storage battery and the electric device. The battery control device according to any one of claims 8 to 16. When the control unit determines that the abnormality has not occurred based on the received diagnosis result, the control unit turns on the operation signal without transmitting a monitoring request signal for monitoring the storage battery to the monitoring unit. The battery control device according to claim 8 or 9, wherein the battery control device switches to a command. The battery control according to any one of claims 8 to 18, wherein the monitoring unit, when diagnosing that the abnormality has occurred, changes diagnostic criteria for the next time diagnosis as to whether or not the abnormality has occurred. Device. The battery control device according to any one of claims 1 to 19, wherein the monitoring unit stores a diagnosis result as to whether or not an abnormality has occurred in at least one of the storage battery and the monitoring unit as binary information. The monitoring unit diagnoses the over-discharge state of the storage battery and the monitoring unit as the abnormality, and stores the diagnosis result of the over-discharge state and the monitoring unit as binary information. battery control device. The monitoring unit and the control unit can be wirelessly connected via each other's wireless communication units (44, 51),
The control unit transmits a connection request signal to the monitoring unit,
When the monitoring unit receives the connection request signal, the monitoring unit determines whether or not to perform a connection establishment process for mutually authenticating the monitoring unit and the control unit based on the stored diagnosis result. 22. The battery control device according to claim 21. The monitoring unit and the control unit can be wirelessly connected via each other's wireless communication units (44, 51),
The battery control device according to any one of claims 1 to 22, wherein the monitoring unit transmits the stored diagnosis result to the control unit by wireless communication. The monitoring unit diagnoses whether or not an abnormality has occurred in at least one of the storage battery and the monitoring unit, and stores the diagnosis result during a period when the switch is in an off state. The battery control device according to any one of the items. The monitoring unit updates the stored diagnosis result to the switch during a period in which the switch is in an off state after the operation signal is an OFF command and until the operation signal is an ON command. The battery control device according to any one of claims 8 to 19 and 21, which transmits the information to a control unit.

Images