JP2021141780A - Power supply control device and power supply control method - Google Patents

Abstract

To provide a power supply device for a mobile object and a power supply method that can check the operation of a relay for shutting down a secondary battery while preventing discomfort to occupants and avoiding functional failure of the mobile object.SOLUTION: A control unit 10 in a power supply control device 1 has a relay operation confirmation unit 14, which executes a relay operation confirmation process to confirm a normal operation of a second relay 30 by switching the second relay 30 between a blocking state and a conduction state in a state where first relays 130, 131 are in a conducting state, a DC-DC converter 60 is operating, and it is recognized by an occupant presence/absence recognition unit 13 that there is no occupant of a vehicle 100.SELECTED DRAWING: Figure 2

Description

The present invention relates to a power supply control device and a power supply control method.

Conventionally, in a battery pack device mounted on a moving body, a configuration including a relay unit for power cutoff control that is turned on when an overvoltage of the battery pack module is detected is known (for example, Patent Document). 1). In the above configuration, the battery pack module is composed of a secondary battery such as a lithium ion battery. Then, the power cutoff control relay unit is turned on, and a fuse element that is blown by the overcurrent flowing from the secondary battery is provided, and the power supply from the secondary battery to the load is cut off by the blown fuse element. The secondary battery is protected.

Japanese Unexamined Patent Publication No. 2014-143799

As described above, when a relay for cutting off the connection between the secondary battery and the load is provided in preparation for the occurrence of an abnormality in the secondary battery, it is desirable to appropriately confirm that the relay operates normally. However, depending on the timing of confirming that the relay operates normally, there is a risk of causing discomfort to the occupants of the moving body. In addition, the power supply from the secondary battery to the load may be cut off, resulting in the malfunction of the mobile body.
The present invention has been made in view of the above background, and the operation of the relay for shutting off the secondary battery is confirmed by preventing the occupant from being uncomfortable and avoiding the functional failure of the moving body. It is an object of the present invention to provide a power supply control device for a mobile body capable of performing the above, and a power supply control method.

As a first aspect for achieving the above object, a first load connected to the first secondary battery and the first secondary battery and operated by the electric power supplied from the first secondary battery. A first, which is connected between the first secondary battery and the first load, and switches between the conductive state and the cutoff state between the first secondary battery and the first load. And a DC-DC converter connected to the first secondary battery and transforming and outputting the output power of the first secondary battery, and a DC-DC converter connected to the DC-DC converter. The second secondary battery charged by the power supplied from the converter is connected to the DC-DC converter and the second secondary battery, and is supplied from the DC-DC converter or the second secondary battery. A power supply control device mounted on a moving body including a second load operated by the generated electric power, which is between the second secondary battery, the DC-DC converter, and the second load. A second relay that is connected to the second battery and switches between the conductive state and the cutoff state between the second secondary battery, the DC-DC converter, and the second load, the DC-DC converter, and the second load. A battery state recognition unit that is connected to the secondary battery of 2 and operates by the output power from the DC-DC converter or the second secondary battery to recognize the state of the second secondary battery, and the battery state recognition unit. When the battery state recognition unit recognizes an abnormality in the second secondary battery, the battery abnormality response unit that shuts off the second relay and the presence / absence recognition of an occupant that recognizes the presence / absence of an occupant of the moving body. The second unit and the second relay are in a conductive state, the DC-DC converter is operating, and the occupant presence / absence recognition unit recognizes that there is no occupant of the moving body. A power supply control device including a control unit having a relay operation confirmation unit for switching the relay of the second relay between a cutoff state and a conduction state and executing a relay operation confirmation process for confirming the normal operation of the second relay. ..
Here, the first relay and the second relay may be a contact relay (mechanical relay) or a non-contact relay (semiconductor relay), and can be controlled to switch between the conduction state and the cutoff state of the contacts. It may be an element.

In the power supply control device, from the state in which the relay operation confirmation unit recognizes that the moving body has an occupant by the occupant presence / absence recognition unit, the relay operation confirmation unit indicates that there is no occupant in the moving body by the occupant presence / absence recognition unit. The relay operation confirmation process may be executed at a timing when a predetermined time has elapsed from the time when the state is switched to the recognized state.

In the power supply control device, the occupant presence / absence recognizing unit recognizes that there is no occupant in the moving body when the main power switch provided in the moving body is in the off state, and the relay operation checking unit has the relay operation checking unit. From the time when the main power switch is switched from the on state to the off state until the relay operation confirmation process is completed, the first relay is maintained in the conductive state and the DC-DC converter is operated to operate the relay. The first relay may be switched to the cutoff state after the confirmation process is completed.

As a second aspect for achieving the above object, a first load connected to the first secondary battery and the first secondary battery and operated by the electric power supplied from the first secondary battery. A first, which is connected between the first secondary battery and the first load, and switches between the conductive state and the cutoff state between the first secondary battery and the first load. And a DC-DC converter connected to the first secondary battery and transforming and outputting the output power of the first secondary battery, and a DC-DC converter connected to the DC-DC converter. The second secondary battery charged by the power supplied from the converter is connected to the DC-DC converter and the second secondary battery, and is supplied from the DC-DC converter or the second secondary battery. In a moving body including a second load operated by the generated electric power, the second secondary battery is connected between the DC-DC converter and the second load, and the second two. A second relay that switches between a conductive state and a cutoff state between the secondary battery and the DC-DC converter and the second load is connected to the DC-DC converter and the second secondary battery. A power supply control method executed by comprising the DC-DC converter or a control unit operated by output power from the second secondary battery, wherein the control unit is the second secondary battery. When the battery state recognition step for recognizing the state of the above and the control unit recognizes the abnormality of the second secondary battery in the battery state recognition step, the second relay is cut off to deal with the battery abnormality. The step, the occupant presence / absence recognition step in which the control unit recognizes the presence / absence of the occupant of the moving body, and the control unit, the first relay is in a conductive state, the DC-DC converter operates, and the control unit operates. , The relay for confirming the normal operation of the second relay by switching the second relay between the cutoff state and the conductive state in a state where it is recognized by the occupant presence / absence recognition step that there is no occupant of the moving body. Examples thereof include a power supply control method including a relay operation confirmation step for executing the operation confirmation process.

According to the power supply control device, the relay operation confirmation unit recognizes that the first relay is in a conductive state, the DC-DC converter operates, and the occupant presence / absence recognition unit recognizes that there is no occupant of the moving body. In this state, the relay operation confirmation process for confirming the normal operation of the second relay by switching the second relay between the cutoff state and the conduction state is executed. This prevents discomfort to the occupants of the moving body, and secures the power supply from the DC-DC converter to the second load, thereby avoiding the functional failure of the moving body. , The operation of the second relay for shutting off the secondary battery can be confirmed.

FIG. 1 is a configuration diagram of a vehicle equipped with a power supply control device. FIG. 2 is a configuration diagram of a power supply control device. FIG. 3 is a flowchart of the relay operation confirmation process.

[1. Vehicle configuration]
With reference to FIG. 1, the configuration of the vehicle 100 equipped with the power supply control device 1 of the present embodiment will be described. The vehicle 100 corresponds to the moving body of the present invention. The moving body of the present invention is not limited to a vehicle, and may be a passenger moving body having a power source.

The vehicle 100 is an electric powered vehicle (electric vehicle, hybrid vehicle, etc.) in which driving wheels (not shown) are driven by a traveling motor 141. The vehicle 100 includes a first battery unit 110 configured by connecting high-voltage secondary batteries 112 and 114 in series. The high-voltage secondary batteries 112 and 114 are lithium-ion batteries, and the output voltage Vb1 of the first battery unit 110 is, for example, about DC48V to 260V.

The first battery unit 110 is connected between the high-voltage secondary batteries 112 and 114, and is shut off when an abnormality occurs in the first battery unit 110. The output current of the first battery unit 110 and the first protection relay 113. It is provided with a fuse 111 that is blown when the battery becomes excessive. The first battery unit 110 is connected to the DC-DC converter 60, the PDU (Power Drive Unit) 140, and the electric compressor inverter 151 via the main contactor 130 and the sub-contactor 131. The main contactor 130 and the sub contactor 131 correspond to the first relay of the present invention.

The main contactor 130 includes a precharge circuit 120 for preventing an inrush current from flowing through the DC-DC converter 60, the PDU 140, and the electric compressor inverter 151 when the main contactor 130 is switched from the cutoff state to the conductive state. They are connected in parallel.

The precharge circuit 120 is configured by connecting a resistor 121 and a precharge contactor 122 in series. The precharge circuit 120 is provided for precharging the DC-DC converter 60, the PDU 140, and the electric compressor inverter 151 with the precharge contactor 122 in a conductive state when the vehicle 100 is started. After the precharge is completed, the main contactor 130 is brought into a conductive state.

The DC-DC converter 60 is connected to the second battery unit 5, the ECU 10, and the load 70 (corresponding to the second load of the present invention). The DC-DC converter 60 steps down the output voltage Vb1 of the first battery unit 110 and outputs the electric power of the voltage Vb2 to the second battery unit 5, the ECU 10, and the load 70. The ECU 10 and the load 70 are operated by the electric power supplied from the DC-DC converter 60 or the second battery unit 5.

The PDU 140 is connected to the traveling motor 141 and outputs driving power to the traveling motor 141 to operate the traveling motor 141. Further, the PDU 140 charges the high-pressure secondary batteries 112 and 114 of the first battery unit 110 by the regenerative power of the traveling motor 141 during the regenerative operation of the traveling motor 141. The electric compressor inverter 151 is connected to the compressor motor 152, outputs driving power to the compressor motor 152, and operates the compressor motor 152.

[2. Power supply control device configuration]
The configuration of the power supply control device 1 will be described with reference to FIG. The power supply control device 1 is composed of a second battery unit 5 and an ECU 10 (including the function of the control unit of the present invention). The output terminal Ta of the second battery unit 5 is connected to the ECU 10, the DC-DC converter 60, and the load 70.

The second battery unit 5 is connected between the low-voltage secondary battery 20, the battery status sensor 21 that detects the state (output voltage, output current, temperature, etc.) of the low-voltage secondary battery 20, the low-voltage secondary battery 20, and the output terminal Ta. The second protection relay 30, the voltage sensor 35 that detects the voltage between the contacts of the second protection relay 30, the conduction side relay 40 for energizing the conduction coil 32 of the second protection relay 30, and the second protection relay 30. A cutoff side relay 50 for energizing the cutoff coil 33 is provided. The low-voltage secondary battery 20 is a lithium-ion battery, and the output voltage Vb2 of the second battery unit is, for example, DC12V.

The second protection relay 30 is a latching relay (key relay), and the contact 31 is brought into a conductive state by energizing the conductive coil 32, and the conductive state of the contact 31 is maintained even after the energization of the conductive coil 32 is stopped. NS. Further, the contact 31 is in a cutoff state by energizing the cutoff coil 33, and the cutoff state of the contact 31 is maintained even after the power supply to the cutoff coil 33 is stopped.

In the conduction side relay 40, the contact 41 is in a conductive state when the coil 42 is energized, and the contact 41 is in a cutoff state when the coil 42 is stopped energized. Similarly, in the cutoff side relay 50, the contact 51 is brought into a conductive state by energizing the coil 52, and the contact 51 is put into a cutoff state by stopping the energization of the coil 52.

The ECU 10 is a control unit composed of a CPU (Central Processing Unit) (not shown), a memory, an interface circuit, and the like. The output port Po1 of the ECU 10 is connected to the coil 42 of the conduction side relay 40, and the output port Po2 is connected to the coil 52 of the cutoff side relay 50. The ECU 10 controls the contact 31 of the second protection relay 30 to be in a conductive state via the conductive side relay 40 by switching the output voltage from the output port Po1.

The input port Pi1 of the ECU 10 is connected to the voltage sensor 35, and the voltage detection signal between the contacts 31 of the second protection relay 30 by the voltage sensor 35 is input. Operation signals IGs of IG (ignition; main power supply) switches (not shown) are input to the input port Pi2 of the ECU 10. The state detection signal Sig of the low-voltage secondary battery 20 by the battery state sensor 21 is input to the input port Pi3 of the ECU 10.

The CPU functions as a battery state recognition unit 11, a battery abnormality response unit 12, an occupant presence / absence recognition unit 13, and a relay operation confirmation unit 14 by reading and executing a control program of the power supply control device 1 stored in the memory. do. The process executed by the battery state recognition unit 11 corresponds to the battery state recognition step in the power supply control method of the present invention, and the process executed by the battery abnormality response unit 12 corresponds to the battery abnormality response step in the power supply control method of the present invention. Corresponds to. The process executed by the occupant presence / absence recognition unit 13 corresponds to the occupant presence / absence recognition step in the power supply control method of the present invention, and the process executed by the relay operation confirmation unit 14 is the relay operation confirmation step in the power supply control method of the present invention. Corresponds to.

The battery state recognition unit 11 recognizes states such as the output voltage, output voltage, and temperature of the low-voltage secondary battery 20 based on the state detection signal Ssig output from the battery state sensor 21. The battery abnormality response unit 12 determines whether or not there is an abnormality in the low-voltage secondary battery 20 based on the state of the low-voltage secondary battery 20 recognized by the battery state recognition unit 11. When the battery abnormality response unit 12 determines that the low-voltage secondary battery 20 is in an abnormal state, it outputs an ON control signal from the output port Po2 to shut off the contact 31 of the second protection relay 30. As a result, the power output from the low-voltage secondary battery 20 is stopped, and over-discharging of the low-voltage secondary battery 20 is avoided.

The occupant presence / absence recognition unit 13 recognizes that no occupant is on board the vehicle 100 when the operation signal IGs of the IG (main power supply) switch indicates that the IG (main power supply) switch is in the off state. .. The relay operation confirmation unit 14 executes a relay operation confirmation process for confirming whether or not the second protection relay 30 operates normally. The details of the relay operation confirmation process will be described later.

[3. Relay operation check processing]
The relay operation confirmation process executed by the relay operation confirmation unit 14 will be described with reference to the flowchart shown in FIG.

In step S1 of FIG. 3, the relay operation confirmation unit 14 turned off the IG (main power supply) switch of the vehicle 100, and the occupant presence / absence recognition unit 13 eliminated the occupant of the vehicle 100 (the occupant got off the vehicle 100). ), The process proceeds to step S2. In step S2, the relay operation confirmation unit 14 starts the operation of the DC-DC converter 60. When the DC-DC converter 60 is already in operation, the relay operation confirmation unit 14 continues the operation of the DC-DC converter 60.

In the following step S3, the relay operation confirmation unit 14 waits for the elapse of a predetermined time and proceeds to the process in step S4. Here, the predetermined time is set assuming the time required for the output of the DC-DC converter 60 to stabilize. In the next step S4, the relay operation confirmation unit 14 energizes the cutoff coil 33 of the second protection relay 30 and then stops the energization of the cutoff coil 33. As a result, when the cutoff operation of the second protection relay 30 is normally performed, the contact 31 of the second protection relay 30 is in the cutoff state, and a voltage of a certain level is generated at the contact 31.

Therefore, in the following step S5, the relay operation confirmation unit 14 determines whether or not the contact voltage VTs detected by the voltage sensor 35 is equal to or greater than the cutoff determination threshold value Vth_off. Then, when the contact voltage VTs is equal to or higher than the cutoff determination threshold value Vth_off, the relay operation confirmation unit 14 determines that the second protection relay 30 has normally cut off, and proceeds to step S6.

On the other hand, when the contact voltage VTs is less than the cutoff determination threshold value Vth_off, the relay operation confirmation unit 14 determines that the second protection relay 30 has not performed the cutoff operation, proceeds to step S10, and proceeds with the protection relay abnormality response process. To execute. As a protection relay abnormality response process, the abnormality information is saved in the memory, and when the IG (main power supply) switch of the vehicle 100 is operated next time, the second protection relay 30 fails on the display of the vehicle 100. The process of displaying the screen notifying that the user is present is executed.

In step S6, the relay operation confirmation unit 14 energizes the conduction coil 32 of the second protection relay 30 and then stops the energization of the conduction coil 32. As a result, when the conduction operation of the second protection relay 30 is normally performed, the contact 31 of the second protection relay 30 is in a conduction state, and the voltage between the contacts 31 becomes zero.

Therefore, in the following step S7, the relay operation confirmation unit 14 determines whether or not the contact voltage VTs detected by the voltage sensor 35 is equal to or less than the continuity determination threshold value Vth_on. Then, when the contact voltage VTs is the continuity determination threshold value Vth_on ≦, the relay operation confirmation unit 14 determines that the second protection relay 30 has normally performed the conduction operation, proceeds to step S8, and proceeds to the main contactor. The main power supply of the vehicle 100 is turned off with the 130 and the sub-contactor 131 shut off.

On the other hand, when the contact voltage VTs exceeds the continuity determination threshold value Vth_on, the relay operation confirmation unit 14 determines that the shutoff operation of the second protection relay 30 has not been performed normally, and proceeds to step S10 to proceed to the above-mentioned process. Executes the protection relay error response processing.

As described above, the relay operation confirmation unit 14 executes the processes after step S2 when it is recognized in step S1 that the vehicle 100 has no occupants due to the turning off of the IG (main power supply) switch. .. Therefore, when the conduction operation and the cutoff operation of the second protection relay 30 are executed in steps S4 and S6, it is possible to prevent the occupant from being uncomfortable due to the operation sound of the second protection relay 30.

Further, the relay operation confirmation unit 14 operates the DC-DC converter 60 in step S2 to bring power to the load 70 from the DC-DC converter 60, and then in step S4, the second protection relay 30. Contact 31 is in a cutoff state. Therefore, even if the contact 31 of the second protection relay 30 is cut off, the load 70 can continue to operate by the electric power supplied from the DC-DC converter 60. As a result, it is possible to prevent the power supply to the load 70 from being cut off and the function realized by the load 70 from being lost.

[4. Other embodiments]
In the above embodiment, the relay operation confirmation unit 14 executes the relay operation confirmation process when the IG (main power supply) switch is turned off, but the relay operation confirmation unit 14 does not necessarily execute the relay operation confirmation process every time the IG (main power supply) switch is turned off. It is not necessary to execute the relay operation check process. For example, the relay operation confirmation process may be executed once a day, once a week, or the like.

In the above embodiment, the occupant presence / absence recognition unit 13 detects the off operation of the IG (main power supply) switch and recognizes that no occupant is on board the vehicle 100. As another embodiment, it may be recognized from the image taken by the camera provided in the interior of the vehicle 100 that no occupant is on the vehicle 100. Alternatively, the vehicle door sensor may detect the opening and closing of the door to recognize that no occupant is on the vehicle 100.

In the above embodiment, the relay operation confirmation unit 14 waits for the elapse of a predetermined time in step S3 of FIG. 3, and then shuts off the second protection relay 30 in step S4. As another embodiment, the second protection relay 30 may be cut off when the voltage sensor detects that the output voltage of the DC-DC converter 60 has reached a predetermined level.

In the above embodiment, as the first secondary battery and the second secondary battery of the present invention, the high pressure secondary batteries 112 and 114 which are lithium ion batteries and the low pressure secondary battery 20 are shown, but the high pressure secondary battery The 112, 114 and the low pressure secondary battery 20 may be other types of secondary batteries.

Note that FIG. 2 is a schematic view showing the configuration of the power supply control device 1 divided according to the main processing contents in order to facilitate the understanding of the present invention. It may be configured by division. Further, the processing of each component may be executed by one hardware unit or may be executed by a plurality of hardware units. Further, the processing by each component shown in FIG. 3 may be executed by one program or may be executed by a plurality of programs.

[5. Configuration supported by the above embodiment]
The above embodiment is a specific example of the following configuration.

(Clause 1) A first secondary battery, a first load connected to the first secondary battery and operated by power supplied from the first secondary battery, and the first two. A first relay connected between the secondary battery and the first load and switching between the first secondary battery and the first load in a conductive state and a cutoff state, and the first relay. A DC-DC converter that is connected to the secondary battery of the above and transforms and outputs the output power of the first secondary battery, and a power supplied from the DC-DC converter that is connected to the DC-DC converter. A second secondary battery to be charged, connected to the DC-DC converter and the second secondary battery, and operated by power supplied from the DC-DC converter or the second secondary battery. A power supply control device mounted on a moving body including the second load, which is connected between the second secondary battery, the DC-DC converter, and the second load, and is the second. The second relay that switches between the secondary battery and the DC-DC converter and the second load is connected to the DC-DC converter and the second secondary battery. Then, the battery state recognition unit that operates by the output power from the DC-DC converter or the second secondary battery and recognizes the state of the second secondary battery, and the battery state recognition unit make the first. A battery abnormality response unit that shuts off the second relay when an abnormality of the secondary battery of 2 is recognized, an occupant presence / absence recognition unit that recognizes the presence / absence of an occupant of the moving body, and the first The second relay is connected to the cutoff state in a state in which the relay is in a conductive state, the DC-DC converter is operating, and the presence / absence occupant recognition unit recognizes that there is no occupant of the moving body. A power supply control device including a control unit including a relay operation confirmation unit that switches to a state and executes a relay operation confirmation process for confirming the normal operation of the second relay.
According to the power supply control device of the first item, in a state where the first relay is in a conductive state, the DC-DC converter is operating, and the presence / absence occupant recognition unit recognizes that there is no occupant of the moving body. , The relay operation confirmation process for confirming the normal operation of the second relay by switching the second relay between the cutoff state and the conduction state is executed. This prevents discomfort to the occupants of the moving body, and secures the power supply from the DC-DC converter to the second load, thereby avoiding the functional failure of the moving body. , The operation of the second relay for shutting off the secondary battery can be confirmed.

(Item 2) The relay operation confirmation unit recognizes that there is no occupant in the moving body by the occupant presence / absence recognition unit from the state in which the occupant presence / absence recognition unit recognizes that the moving body has an occupant. The power supply control device according to item 1, wherein the relay operation confirmation process is executed at a timing when a predetermined time has elapsed from the time when the state is switched to the above state.
According to the power supply control device of the second item, the relay operation confirmation process can be executed at a timing when it is assumed that the occupant is separated from the moving body to some extent and the operation sound of the second relay is not noticeable.

(Item 3) The occupant presence / absence recognition unit recognizes that there is no occupant in the moving body when the main power switch provided in the moving body is in the off state, and the relay operation checking unit recognizes that there is no occupant in the moving body. From the time when the power switch is switched from the on state to the off state until the relay operation confirmation process is completed, the first relay is maintained in the conductive state and the DC-DC converter is operated to confirm the relay operation. The power supply control device according to item 1 or 2, wherein the first relay is switched to a cutoff state after the processing is completed.
According to the power supply control device of the third item, when the occupant turns off the main power switch and leaves the moving body, the power supply to the second load can be maintained and the relay operation confirmation process can be executed. ..

(Item 4) A first secondary battery, a first load connected to the first secondary battery and operated by power supplied from the first secondary battery, and the first two. A first relay connected between the secondary battery and the first load and switching between the first secondary battery and the first load in a conductive state and a cutoff state, and the first relay. A DC-DC converter that is connected to the secondary battery of the above and transforms and outputs the output power of the first secondary battery, and a power supplied from the DC-DC converter that is connected to the DC-DC converter. A second secondary battery to be charged, connected to the DC-DC converter and the second secondary battery, and operated by power supplied from the DC-DC converter or the second secondary battery. In a moving body provided with the second load, the second secondary battery and the DC-DC converter and the second load are connected to each other, and the second secondary battery and the DC-DC are connected to each other. A second relay that switches between a conductive state and a cutoff state between the converter and the second load is connected to the DC-DC converter and the second secondary battery, and the DC-DC converter or the DC-DC converter or A power supply control method executed by including a control unit that operates by the output power from the second secondary battery, wherein the control unit recognizes the state of the second secondary battery. The recognition step, the battery abnormality response step that shuts off the second relay when the control unit recognizes the abnormality of the second secondary battery by the battery state recognition step, and the control unit According to the occupant presence / absence recognition step of recognizing the presence / absence of an occupant of the moving body, and the control unit in which the first relay is in a conductive state, the DC-DC converter is operated, and the occupant presence / absence recognition step is performed. A relay that executes a relay operation confirmation process for confirming the normal operation of the second relay by switching the second relay between a cutoff state and a conduction state in a state where it is recognized that there is no occupant of the moving body. Power supply control methods, including operation check steps.
By executing the power supply control method of the fourth item by the control unit, the configuration of the power supply control device of the first item can be realized.

1 ... Power supply control device, 10 ... ECU (control unit), 11 ... Battery status recognition unit, 12 ... Battery abnormality response unit, 13 ... Crew presence / absence recognition unit, 14 ... Relay operation confirmation unit, 20 ... Low voltage secondary battery, 21 ... Battery status sensor, 30 ... Second protection relay (second relay), 35 ... Voltage sensor, 40 ... Conducting side relay, 50 ... Breaking side relay, 60 ... DC-DC converter, 70 ... Load, 100 ... Vehicle ( Mobile unit), 110 ... 1st battery unit, 113 ... 1st protection relay (1st relay).

Claims (4)

With the first rechargeable battery
A first load connected to the first secondary battery and operated by electric power supplied from the first secondary battery, and
A first relay that is connected between the first secondary battery and the first load and switches between the conductive state and the cutoff state between the first secondary battery and the first load. When,
A DC-DC converter that is connected to the first secondary battery and transforms and outputs the output power of the first secondary battery.
A second secondary battery connected to the DC-DC converter and charged by the electric power supplied from the DC-DC converter, and
A second load connected to the DC-DC converter and the second secondary battery and operated by electric power supplied from the DC-DC converter or the second secondary battery.
It is a power supply control device mounted on a mobile body equipped with
It is connected between the second secondary battery and the DC-DC converter and the second load, and between the second secondary battery and the DC-DC converter and the second load, A second relay that switches between a conductive state and a cutoff state,
It is connected to the DC-DC converter and the second secondary battery, and is operated by the output power from the DC-DC converter or the second secondary battery.
A battery state recognition unit that recognizes the state of the second secondary battery, and
When an abnormality of the second secondary battery is recognized by the battery state recognition unit, a battery abnormality response unit that shuts off the second relay and a battery abnormality response unit.
An occupant presence / absence recognition unit that recognizes the presence / absence of an occupant of the moving body,
In a state where the first relay is in a conductive state, the DC-DC converter is operating, and the presence / absence occupant recognition unit recognizes that there is no occupant of the moving body, the second relay is operated. A control unit having a relay operation confirmation unit that executes a relay operation confirmation process for confirming the normal operation of the second relay by switching between a cutoff state and a conduction state.
Power supply control device. The relay operation confirmation unit changes from a state in which the occupant presence / absence recognition unit recognizes that the moving body has an occupant to a state in which the occupant presence / absence recognition unit recognizes that the moving body does not have an occupant. The power supply control device according to claim 1, wherein the relay operation confirmation process is executed at a timing when a predetermined time has elapsed from the time of switching. The occupant presence / absence recognition unit recognizes that there is no occupant in the moving body when the main power switch provided in the moving body is in the off state.
The relay operation confirmation unit maintains the first relay in a conductive state from the time when the main power switch is switched from the on state to the off state until the relay operation confirmation process is completed, and the DC-DC. The power supply control device according to claim 1 or 2, wherein the converter is operated and the first relay is switched to the cutoff state after the relay operation confirmation process is completed. With the first rechargeable battery
A first load connected to the first secondary battery and operated by electric power supplied from the first secondary battery, and
A first relay that is connected between the first secondary battery and the first load and switches between the conductive state and the cutoff state between the first secondary battery and the first load. When,
A DC-DC converter that is connected to the first secondary battery and transforms and outputs the output power of the first secondary battery.
A second secondary battery connected to the DC-DC converter and charged by the electric power supplied from the DC-DC converter, and
A second load connected to the DC-DC converter and the second secondary battery and operated by electric power supplied from the DC-DC converter or the second secondary battery.
In a mobile body equipped with
It is connected between the second secondary battery and the DC-DC converter and the second load, and between the second secondary battery and the DC-DC converter and the second load, A second relay that switches between a conductive state and a cutoff state,
A control unit that is connected to the DC-DC converter and the second secondary battery and operates by the output power from the DC-DC converter or the second secondary battery.
It is a power supply control method that is executed with
A battery state recognition step in which the control unit recognizes the state of the second secondary battery, and
When the control unit recognizes the abnormality of the second secondary battery by the battery state recognition step, the battery abnormality response step of setting the second relay to the cutoff state and the battery abnormality response step.
An occupant presence / absence recognition step in which the control unit recognizes the presence / absence of an occupant of the moving body, and
The control unit is in a state where the first relay is in a conductive state, the DC-DC converter is operating, and it is recognized by the occupant presence / absence recognition step that there is no occupant of the moving body. A relay operation confirmation step of switching the second relay between a cutoff state and a conduction state and executing a relay operation confirmation process for confirming the normal operation of the second relay, and a relay operation confirmation step.
Power supply control method including.

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