CN112425024A - Switch unit and battery device - Google Patents
Switch unit and battery device Download PDFInfo
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- CN112425024A CN112425024A CN201980047517.7A CN201980047517A CN112425024A CN 112425024 A CN112425024 A CN 112425024A CN 201980047517 A CN201980047517 A CN 201980047517A CN 112425024 A CN112425024 A CN 112425024A
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- switch
- battery
- state
- voltage
- controller
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
- H02J7/1423—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle with multiple batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/512—Connection only in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/40—The network being an on-board power network, i.e. within a vehicle
- H02J2310/46—The network being an on-board power network, i.e. within a vehicle for ICE-powered road vehicles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/40—The network being an on-board power network, i.e. within a vehicle
- H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The switch unit (10) has a first switch (19), a second switch (20), a voltage sensor (22), and a controller (23). The first switch (19) is connected in series with the second switch (20). A voltage sensor (22) detects a voltage between the first switch (19) and the second switch (20). When a command for switching the first battery (18) from the disconnected state to the energized state is obtained, the controller (23) determines an open failure of the second switch based on the voltage of the voltage sensor (22) in a state in which the first switch (19) is opened and the second switch (20) is closed. The controller (23) determines an open failure of the first switch (19) on the basis of the voltage sensor (22) in a state in which the second switch (20) is opened and the first switch (19) is closed. The controller (23) switches the second switch (20) on while maintaining the on state of the first switch.
Description
Cross Reference to Related Applications
This application claims priority to a patent application 2018-.
Technical Field
The invention relates to a switch unit and a battery device.
Background
In a relay used in an electric circuit, since a contact area when switching an open/closed state is smaller than that when fully contacting, there is a possibility that a resistance value of a contact point becomes high. Therefore, when the relay is switched to the energized state in which a potential difference exists between both ends of the relay, or when the relay is switched to the off state when a current flows, a large current may flow through the high-resistance contact to cause heat generation at the contact, and eventually the contact may be fixed (stuck).
Therefore, it has been proposed to configure two relays as a relay circuit connected in series and perform a fault diagnosis for the two relays (see patent document 1). By energizing and de-energizing the two relays with a time difference, the possibility of the entire relay circuit failing can be reduced. Further, by performing the failure diagnosis, the user can easily recognize the failure of a portion that may occur while the relay circuit performs the energization and interruption functions, and therefore, the occurrence of the failure of the energization and interruption functions of the entire relay circuit can be reduced.
(Prior art document)
(patent document)
Patent document 1: japanese patent laid-open publication No. 2001-173545
Disclosure of Invention
(problems to be solved by the invention)
However, in the relay circuit described in patent document 1, the relay needs to be turned on and off in order to perform failure diagnosis in addition to the time of applying and cutting off the load, and therefore the number of times of turning on and off the relay increases. As a result, the probability of failure of the relay within the relay circuit may increase.
(measures taken to solve the problems)
In order to solve the above problem, a switch unit according to a first aspect of the present invention is a switch unit that switches between an energized state and a cut-off state of a first battery, the switch unit including:
a first switch and a second switch connected in series with each other, one of which is connected to the first battery;
a voltage sensor that detects a voltage between the first switch and the second switch;
and a controller that determines an off failure of the second switch based on a voltage detected by the voltage sensor in a state where the first switch is turned off and the second switch is turned on when a command to switch the first battery from an off state to an on state is obtained, determines an off failure of the first switch based on a voltage detected by the voltage sensor in a state where the second switch is turned off and the first switch is turned on after the determination of the off failure of the second switch, and switches the second switch to an on state while maintaining the on state of the first switch after the determination of the off failure of the first switch, and switches the first battery from the off state to the on state.
In order to solve the above problem, a battery device according to a second aspect of the present invention includes:
a first battery connected in parallel to a second battery;
a first switch and a second switch connected in series with each other, connecting the first battery and the second battery;
a voltage sensor that detects a voltage between the first switch and the second switch;
and a controller that, when a command to switch the first battery from a disconnected state to an energized state is obtained, determines an open failure of the second switch based on a voltage detected by the voltage sensor in a state in which the first switch is opened and the second switch is closed, determines an open failure of the first switch based on a voltage detected by the voltage sensor in a state in which the second switch is opened and the first switch is closed after determining the open failure of the second switch, and switches the second switch to an on state while maintaining the on state of the first switch after determining the open failure of the first switch, and switches the first battery from the disconnected state to the energized state.
(Effect of the invention)
According to the present invention, there are provided a switch unit and a battery device in which, among a plurality of switches connected in series, the number of times of switching of the switches can be reduced by commonly switching from off to on when a part of the switches are brought into an energized state and switching from off to on when a failure diagnosis is performed on the part of the switches.
Drawings
Fig. 1 is a functional block diagram showing a schematic configuration of a regenerative power storage system including a battery device including a switching unit according to an embodiment of the present invention.
Fig. 2 is a flowchart for explaining the on-failure determination control and the energization control that are continuously executed by the controller of fig. 1.
Fig. 3 is a flowchart for explaining the shut-off control executed by the controller of fig. 1.
Detailed Description
Hereinafter, an embodiment of a switch unit to which the present invention is applied will be described with reference to the drawings.
As shown in fig. 1, a battery device 11 including a switching unit 10 according to a first embodiment of the present invention constitutes a part of a regenerative power storage system 12. The regenerative power storage system 12 includes an ISG (Integrated Starter Generator) 13, a Starter 14, a second battery 15, an electric device 16, and a battery device 11. The ISG 13, the starter 14, the second battery 15, the electrical device 16, and the battery device 11 are connected in parallel. Further, the ISG 13 and the battery device 11 are connected to the starter 14, the second battery 15, and the electric device 16 via a supply relay 17. Further, as shown in fig. 1, the second battery 15 and the battery device 11 are each grounded.
The regenerative power storage system 12 may be mounted on a vehicle such as a gasoline car, a diesel car, or a hybrid car. In fig. 1, a solid line connecting the functional blocks indicates a flow of electric power. In fig. 1, a dotted line connecting the functional blocks indicates a flow of a control signal or information to be communicated.
The ISG 13 is mechanically connected, directly or indirectly, to at least one of an engine and a drive shaft of the vehicle. The ISG 13 can generate power by the driving of the engine or the rotation of the drive shaft. The ISG 13 may adjust the generated power to an output voltage by a regulator (regulator) and supply it to the second battery 15, the electric device 16, and the battery device 11. The ISG 13 can generate power by regeneration at the time of deceleration of the vehicle or the like. The electric power obtained by the ISG 13 through regenerative power generation can be stored in the second battery 15 and the battery device 11. The ISG 13 receives power supply from the battery device 11 and is used to restart the engine in idle stop (idling stop), for example.
The starter 14 is, for example, a starter motor. The starter 14 receives power supply from at least one of the second battery 15 and the battery device 11 when a switch connected to the starter 14 is turned on based on an ignition operation or a depression of a start switch, and starts the engine.
The second battery 15 is, for example, a lead storage battery having an output voltage of a rated voltage of 12V, and can supply electric power to the starter 14 and the electric device 16.
The electric device 16 is a load device including, for example, an audio system, an air conditioner, a navigation system, and the like provided in the vehicle, and consumes the supplied electric power to operate.
The battery device 11 is not particularly limited, but is, for example, a lithium ion battery device. A lithium ion battery may be used for the battery device 11. In the first embodiment, the output voltage of the battery device 11 is different from the output voltage of the second battery 15, and is adjusted to be substantially the same as the output voltage of the second battery 15 by the DC/DC converter. Alternatively, the output voltage of the battery device 11 may be substantially the same as the output voltage of the second battery 15. The battery device 11 may supply power to the ISG 13, the starter 14, and the electrical device 16.
The battery device 11 includes a first battery 18 and a switch unit 10. The first battery 18 is connected to the ISG 13 and the supply relay 17 via the switch unit 10.
The first battery 18 is not particularly limited, but is, for example, a battery pack including a plurality of battery cells (cells) such as lithium ion batteries. In the first battery 18, a plurality of battery cells are connected in series or in parallel.
The switch unit 10 switches the energized state and the cut-off state of the first battery 18. The switch unit 10 includes a first switch 19, a second switch 20, a fuse (fuse) 21, a voltage sensor 22, and a controller 23.
The first switch 19 and the second switch 20 are not particularly limited, but are, for example, electromagnetic relays (relays). More specifically, the first switch 19 and the second switch 20 are normally open relays (make contact relay). The first switch 19 and the second switch 20 may be semiconductor switches such as transistors.
The first switch 19 and the second switch 20 are connected in series. A pull-down resistor is connected between the first switch 19 and the second switch 20, and when the first switch 19 and the second switch 20 are turned off, the voltage between the first switch 19 and the second switch 20 is zero.
Either one of the first switch 19 and the second switch 20 is connected to the first battery 18. In the present embodiment, the second switch 20 is provided between the first switch 19 and the first battery 18, thereby being connected to the first battery 18. The first switch 19 and the second switch 20 switch the energization state and the shutoff state of the entire switch unit 10 based on the control of a controller 23 which will be described later.
Here, as described later, the first switch 19 is a switch that is simultaneously executed to make common the off-to-on switching for execution at the time of the failure determination control and the off-to-on switching for bringing the first battery 18 into the energized state.
In the present embodiment, the fuse 21 is connected in series to the first switch 19. The fuse 21 is cut by the temperature rise due to joule heat when a large current flows. The amount of heat generated at the time of cutting is obtained by subtracting the amount of heat radiation from the amount of heat required for heating until the fuse 21 is cut. Further, the amount of heat generation is calculated by (current) 2 × (energization time) × (internal resistance of the fuse 21). Further, the heat radiation amount is calculated by { (temperature at the time of cutting of the fuse 21) - (outside air temperature) } × (heat radiation rate constant) × (time).
The voltage sensor 22 detects a voltage between the first switch 19 and the second switch 20. The voltage sensor 22 notifies the controller 23 of the detected voltage value.
The controller 23 may be constituted by a microcomputer, for example. The controller 23 takes a voltage value from the voltage sensor 22. The controller 23 acquires a detection value such as a voltage value of each battery cell from the first battery 18. The controller 23 acquires information, commands, and the like of the vehicle from an external device such as an ECU.
The controller 23 can perform switching control of the on, i.e., connected state (state of connecting the contacts of the switches) and the off, i.e., disconnected state (state of disconnecting the contacts of the switches) of the first switch 19 and the second switch 20, respectively, based on the acquired information or the like.
The controller 23 may execute the disconnection control of the first battery 18 when a command to switch the first battery 18 from the energized state to the disconnected state is obtained. The interruption control in the present embodiment means control for turning off both the first switch 19 and the second switch 20.
The controller 23 may execute the energization control of the first battery 18 when a command to switch the first battery 18 from the disconnected state to the energized state is obtained. The energization control referred to in the present embodiment includes an off failure determination control of the first switch 19 and the second switch 20 before the first switch 19 and the second switch 20 are turned on, although both the first switch 19 and the second switch 20 are finally turned on. The off failure is a failure in which the switch cannot be switched from off to on and the switch is always off. The open failure determination control is control for determining occurrence of an open failure of the switch.
When the controller 23 receives a command to switch the first battery 18 from the disconnected state to the energized state, the supply relay 17 is switched on by the ECU or the like before the command. The energization control may be executed on the assumption that the supply relay 17 is switched on.
In the energization control, the controller 23 obtains the voltage detected by the voltage sensor 22 in a state where the first switch 19 is turned off and the second switch 20 is turned on.
The controller 23 determines whether or not the second switch 20 has an open failure based on the obtained voltage. For example, when the voltage obtained in the state where the second switch 20 is turned on is equal to or higher than the threshold value, the controller 23 determines that the second switch 20 has not failed to be turned off. Further, for example, the threshold value of the voltage may be set as a lower limit value (or less than the lower limit value) of the available voltage range of the first battery 18. Alternatively, when the voltage of the first battery 18 is acquired by a voltage sensor different from the voltage sensor 22, the controller 23 determines that the second switch 20 has not failed to open (is normal) when the voltage acquired by the voltage sensor 22 and the voltage of the first battery 18 (the voltage acquired by the voltage sensor) are substantially equal to each other, that is, when the voltage is within the error range.
In the energization control, after the determination of the off failure of the second switch 20, the controller 23 temporarily switches the second switch 20 off. Then, the controller 23 switches the first switch 19 on to obtain the voltage detected by the voltage sensor 22. In this state, the supply relay 17 is turned on.
The controller 23 determines whether or not the first switch 19 has an open failure based on the obtained voltage. For example, when the obtained voltage is equal to or higher than the threshold value, the controller 23 determines that the open failure of the first switch 19 has not occurred (normal) considering that the voltage of the second battery 15 is detected by the supply relay and the first switch 19. When the obtained voltage is smaller than the threshold value, the controller 23 determines that an open failure has occurred in at least one of the first switch 19 and the supply relay 17. In the case of performing discharge control for making the voltage of the second battery 15 substantially equal to the voltage of the first battery 18, the threshold value at the time of performing off failure determination control on the second switch 20 may be used as the threshold value of the voltage.
On the other hand, in a configuration in which the voltage of the second battery 15 is different from the voltage of the first battery 18, the controller 23 determines an open failure of the first switch 19 with the voltage of the second battery 15 set as a reference as a threshold value of the voltage. In this configuration, when the obtained voltage is substantially different from the voltage of the second battery 15, the controller 23 determines that an open failure has occurred in at least one of the first switch 19 and the supply relay 17.
In the energization control, after the determination of the off failure of the first switch 19, the controller 23 switches the second switch 20 on. Since the second switch 20 is switched on, both the first switch 19 and the second switch 20 are turned on, and the first battery 18 is switched to the energized state. When the first battery 18 is turned on, charging by the ISG 13 and power supply to the electric device 16 or the starter 14 are started.
In the disconnection control, the controller 23 may switch one of the first switch 19 and the second switch 20 to off, and then switch the other to off. In the present embodiment, the controller 23 switches the second switch 20 off after switching the first switch 19 off. That is, in the present embodiment, the first switch 19 is switched first and then the second switch 20 is switched in the power-on control and the power-off control.
When the first battery 18 is in the off state, the controller 23 may execute the on-failure determination control in any condition such as a regular period or a periodic period immediately before the energization control is executed or immediately after the off control is ended, based on a command from an external device, for example. In the present embodiment, the controller 23 executes the on failure determination control immediately before the energization control is executed. The on-failure is a failure in which the switch cannot be switched from on to off and the switch is always on. The on-failure determination control is control for determining occurrence of an on-failure of the switch.
In the on-failure determination control, the controller 23 obtains the voltage detected by the voltage sensor 22 in a state where the first battery 18 is off, that is, in a state where the first switch 19 and the second switch 20 are off. The controller 23 determines an on failure of at least one of the first switch 19 and the second switch 20 based on the obtained voltage. For example, when the obtained voltage is less than the threshold value, the controller 23 determines that the on-failure of the first switch 19 and the second switch 20 has not occurred (normal). When the obtained voltage is equal to or higher than the threshold value, the controller 23 determines that an on failure has occurred in at least one of the first switch 19 and the second switch 20. In this case, when the voltages of the first battery 18 and the second battery 20 are obtained, it is possible to determine which switch has the on failure by comparing these voltages with the voltage obtained by the voltage sensor 22.
When determining that an open failure has occurred in either the first switch 19 or the supply relay 17 or the second switch 20, the controller 23 generates a report signal reporting that an open failure has occurred. Further, the controller 23 determines that an on-failure has occurred in at least one of the first switch 19 and the second switch 20, and generates a report signal reporting that the on-failure has occurred. The controller 23 transmits the report signal to the external device. The external device such as the display and the alarm lamp that finally acquires the report signal reports the failure of the switch unit 10 to the user.
Next, in the present embodiment, the on failure determination control and the energization control executed by the controller 23 will be described using the flowchart of fig. 2. When a command to execute the energization control is received from an external device, the controller 23 starts the energization control and the failure determination control. As described above, when the command for executing the energization control is received, the first switch 19 and the second switch 20 are turned off, and the supply relay 17 is turned on. In the present embodiment, the on failure determination control is executed before the energization control, but may be executed in a state where the first switch 19 and the second switch 20 are off as described above after the end of the off control.
In step S100, the controller 23 starts the on failure determination control to determine whether the voltage obtained from the voltage sensor 22 is less than a threshold value. In the case where the voltage is not less than the threshold value, the flow advances to step S101. When the voltage is less than the threshold value, the turn-on failure determination control is ended, and the flow proceeds to step S102.
In step S101, the controller 23 generates a report signal indicating that an on failure has occurred in at least one of the first switch 19 and the second switch 20. Further, the controller 23 outputs the report signal to an external device, and reports that an on failure has occurred in at least one of the first switch 19 and the second switch 20. After the report, the turn-on failure control is terminated, and the execution of the energization control is also suspended.
In step S102, the controller 23 starts the energization control to switch the second switch 20 on. After the switching, the flow advances to step S103. In step S102, the first switch 19 is ensured to be normally turned off by the previous on failure determination control. Therefore, since no current flows through the second switch 20 even if the second switch 20 is turned on in this state, the risk of the second switch 20 being stuck is small.
In step S103, the controller 23 determines whether or not the voltage obtained from the voltage sensor 22 is equal to or higher than a threshold value. If the voltage is not equal to or higher than the threshold value, the flow proceeds to step S104. When the voltage is equal to or higher than the threshold value, the flow proceeds to step S105.
In step S104, the controller 23 generates a report signal indicating that an open failure has occurred in the second switch 20. Further, the controller 23 outputs the report signal to an external device, and reports that an open failure has occurred in the second switch 20. After the report, the power-on control is ended.
In step S105, the controller 23 switches the second switch 20 off. After the switching, the flow advances to step S104. In step S105, the second switch 20 is also turned off in a state where no current flows through the second switch 20, and therefore the risk of the second switch 20 being fixed is small.
In step S106, the controller 23 switches the first switch 19 on. After the switching, the flow advances to step S107. In step S106, the second switch 20 is turned off and turned on in a state where no current flows through the first switch 19, so that the first switch 19 is less likely to be fixed. In step S106, the on operation of the first switch 19 is part of the energization control for turning on both the first switch 19 and the second switch 20. In other words, the operation of switching the first switch 19 from off to on for the off failure determination of the first switch 19 and the operation of switching the first switch 19 from off to on for the energization state of the first battery 18 are performed simultaneously in common.
In step S107, the controller 23 determines whether or not the voltage obtained from the voltage sensor 22 is equal to or higher than a threshold value. If the voltage is not equal to or greater than the threshold value, the flow proceeds to step S108. When the voltage is equal to or higher than the threshold value, the flow proceeds to step S109.
In step S108, the controller 23 generates a report signal indicating that an open failure has occurred in at least one of the first switch 19 and the supply relay 17. Further, the controller 23 outputs the report signal to an external device, and reports that an open failure has occurred in at least one of the first switch 19 and the supply relay 17. After the report, the power control is terminated.
In step S109, the controller 23 switches the second switch 20 on. After the switching, the energization control is ended.
Next, in the present embodiment, the shut-off control executed by the controller 23 will be described with reference to the flowchart of fig. 3. When the controller 23 receives a command to execute the shutoff control from the external device, the shutoff control is started.
In step S200, the controller 23 switches the first switch 19 off. After the switching, the flow advances to step S201.
In step S201, the controller 23 switches the second switch 20 off. After the switching, the disconnection control is ended.
In the switch unit 10 according to the present embodiment as described above, the controller 23 determines an off failure of the second switch 20 based on the voltage detected by the voltage sensor 22 in a state where the first switch 19 is turned off and the second switch 20 is turned on when the first battery 18 is switched from the off state to the on state, switches the first switch 19 on after switching the second switch 20 off, determines an off failure of the first switch 19 based on the voltage detected by the voltage sensor 22 in a state where the first switch 19 is turned on, and switches the second switch 20 on after determining an off failure of the first switch 19. According to this configuration, in the switch unit 10, the operation of switching the first switch 19 from off to on for the off failure determination of the first switch 19 and the operation of switching the first switch 19 from off to on for the switching to the energized state of the first battery 18 are performed simultaneously while being shared. Therefore, the switch unit 10 can reduce the number of times of switching of the first switch 19 and the second switch 20 required for failure diagnosis different from the original purpose, that is, the purpose of switching the energization state and the cut-off state of the first battery 18. As a result, the switching unit 10 can perform failure determination while reducing the possibility of failure of the first switch 19 and the second switch 20, which are the plurality of relays connected in series.
In the switch unit 10 according to the present embodiment, when one of the first switch 19 and the second switch 20 is determined to have an open failure, the other switch is in an open state. Thus, even if the on/off of the changeover switch is switched for the determination of the one off failure, the current does not flow through the one switch, and therefore, the sticking risk can be reduced. That is, in the present embodiment, the number of times of switching is increased by the number of times of on-switching of the switch for off failure determination in addition to on-switching performed to bring the first battery 18 into the energized state, but the risk of fixation of the switch is reduced in the off failure determination. That is, even if the number of times of switching of the switch increases, it is possible to suppress an increase in the risk of failure.
In the switch unit 10 according to the present embodiment, the voltage between the first switch 19 and the second switch 20 is used for determining the off failure and the on failure of the first switch 19 and the second switch 20. When a current is used for determining a fault, since a determination cannot be made unless a change in current is detected, it is necessary to switch between a state in which both the first switch 19 and the second switch 20 are turned on and a state in which either one is turned off in order to determine the fault. On the other hand, in the switch unit 10 configured as described above, one and the other of the first switch 19 and the second switch 20 are connected to one and the other of the first battery 18 and the second battery 15, respectively, whereby a failure can be determined even when both the first switch 19 and the second switch 20 are not turned on. Therefore, since the switching unit 10 determines that one of the first switch 19 and the second switch 20 is off while the other is off, it is possible to reduce the possibility of occurrence of on-fixation due to on-off switching of the both.
In addition, in the switch unit 10 relating to the present embodiment, the second switch 20 is provided between the first switch 19 and the first battery 18. In the switch unit 10, at least one of the first switch 19 and the second switch 20 may be switched off in an emergency required in the energized state of the first battery 18. Therefore, in the switch unit 10, it is desirable to promptly determine that at least one of the first switch 19 and the second switch 20 functions normally. However, the switching unit 10 is designed to be connected to the positive electrode of the first battery 18 and to the positive electrode of the second battery 15 via the supply relay 17. Therefore, in the open failure determination of the first switch 19, it is not possible to determine which of the first switch 19 and the supply relay 17 has failed. In contrast, in the switch unit 10 of the above-described structure, the second switch 20 is connected at a position (between the voltage sensor 22 and the first battery 18) where the occurrence of the disconnection fault can be determined. In the present embodiment, the first switch 19 is turned off and the second switch 20 is turned on, and then the voltage sensor 22 acquires a voltage to detect an off failure of the second switch 20. With this configuration, the reliability of connection to the second switch 20 closest to the first battery 18 can be ensured.
The switching unit 10 according to the present embodiment determines the on failure of the first switch 19 and the second switch 20 based on the voltage in the off state of the first battery 18. Therefore, the switching unit 10 can determine not only the open failure but also the close failure of the first switch 19 and the second switch 20 without switching the first switch 19 and the second switch 20 for failure determination.
It will be apparent to those skilled in the art that the present invention can be carried out in other specific ways than the ones described above without departing from the spirit or essential characteristics of the invention. Accordingly, the above description is by way of example only and is not intended as limiting. The scope of the invention is defined by the appended claims rather than the foregoing description. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
For example, the first switch 19 may also be disposed between the second switch 20 and the first battery 18, thereby being connected to the first battery 18. That is, in this case, the first switch 19 is connected to the positive electrode side of the first battery 18, and the second switch 20 is connected between the first switch 20 and the supply relay 17. Even in this case, the energization control shown in fig. 2 described above can be executed. In the disconnection control, the second switch 20 may be turned off first, and then the first switch 19 may be turned off.
In the present embodiment, the switch unit 10 includes two switches, i.e., the first switch 19 and the second switch 20, but three or more switches may be connected in series.
(description of reference numerals)
10: a switch unit; 11: a battery device; 12: a regenerative power storage system;
13: ISG (Integrated Starter Generator); 14: a starter;
15: a second battery; 16: an electrical device; 17: a supply relay; 18: a first battery;
19: a first switch; 20: a second switch; 21: a fuse; 22: a voltage sensor;
23: and a controller.
Claims (5)
1. A switch unit for switching an energized state and a cut-off state of a first battery, comprising:
a first switch and a second switch connected in series with each other, one of which is connected to the first battery;
a voltage sensor that detects a voltage between the first switch and the second switch; and
and a controller that, when a command to switch the first battery from a disconnected state to an energized state is obtained, determines an open failure of the second switch based on a voltage detected by the voltage sensor in a state in which the first switch is opened and the second switch is closed, determines an open failure of the first switch based on a voltage detected by the voltage sensor in a state in which the second switch is opened and the first switch is closed after the determination of the open failure of the second switch, and switches the second switch to an on state while maintaining the on state of the first switch after the determination of the open failure of the first switch, and switches the first battery from the disconnected state to the energized state.
2. The switch unit of claim 1,
the second switch is disposed between the first switch and the first battery.
3. The switch unit of claim 1,
the first switch is disposed between the second switch and the first battery.
4. The switch unit according to any one of claims 1 to 3,
the controller determines an on failure of the first switch and the second switch based on a voltage detected by the voltage sensor in an off state of the first battery.
5. A battery device, comprising:
a first battery connected in parallel to a second battery;
a first switch and a second switch connected in series with each other and connecting the first battery and the second battery;
a voltage sensor that detects a voltage between the first switch and the second switch; and
and a controller that, when a command to switch the first battery from a disconnected state to an energized state is obtained, determines an open failure of the second switch based on a voltage detected by the voltage sensor in a state in which the first switch is opened and the second switch is closed, determines an open failure of the first switch based on a voltage detected by the voltage sensor in a state in which the second switch is opened and the first switch is closed after the determination of the open failure of the second switch, and switches the second switch to an on state while maintaining the on state of the first switch after the determination of the open failure of the first switch, and switches the first battery from the disconnected state to the energized state.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018147670A JP6648217B2 (en) | 2018-08-06 | 2018-08-06 | Switch unit and battery device |
| JP2018-147670 | 2018-08-06 | ||
| PCT/JP2019/029700 WO2020031779A1 (en) | 2018-08-06 | 2019-07-29 | Switch unit and battery device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112425024A true CN112425024A (en) | 2021-02-26 |
Family
ID=69414189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980047517.7A Pending CN112425024A (en) | 2018-08-06 | 2019-07-29 | Switch unit and battery device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6648217B2 (en) |
| CN (1) | CN112425024A (en) |
| DE (1) | DE112019003939T5 (en) |
| WO (1) | WO2020031779A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114280470A (en) * | 2021-12-02 | 2022-04-05 | 苏州博沃创新能源科技有限公司 | State detection method, isolation detection circuit and equipment for electric vehicle relay |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009259762A (en) * | 2008-03-28 | 2009-11-05 | Hitachi Ltd | Power source having a plurality of relays |
| JP2015171305A (en) * | 2014-03-11 | 2015-09-28 | オムロンオートモーティブエレクトロニクス株式会社 | power supply circuit |
| CN108023583A (en) * | 2016-10-28 | 2018-05-11 | 矢崎总业株式会社 | Control apparatus of semiconductor switch |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4035777B2 (en) * | 2003-02-10 | 2008-01-23 | 株式会社デンソー | Discharge device for battery pack |
| JP2007145208A (en) * | 2005-11-29 | 2007-06-14 | Matsushita Electric Ind Co Ltd | Electronic control device |
| JP5311233B2 (en) * | 2010-12-27 | 2013-10-09 | 株式会社デンソー | Motor control device and electric power steering device using the same |
| JP6155569B2 (en) * | 2012-07-31 | 2017-07-05 | 株式会社デンソー | Power system |
| JP6206317B2 (en) * | 2014-05-12 | 2017-10-04 | トヨタ自動車株式会社 | Power storage system |
| JP5977855B1 (en) * | 2015-03-31 | 2016-08-24 | 富士重工業株式会社 | Vehicle power supply |
| JP6665757B2 (en) * | 2016-11-08 | 2020-03-13 | 株式会社デンソー | Power control device and battery unit |
| JP6627732B2 (en) * | 2016-12-07 | 2020-01-08 | 株式会社デンソー | Power supply circuit device |
-
2018
- 2018-08-06 JP JP2018147670A patent/JP6648217B2/en active Active
-
2019
- 2019-07-29 WO PCT/JP2019/029700 patent/WO2020031779A1/en active Application Filing
- 2019-07-29 DE DE112019003939.3T patent/DE112019003939T5/en active Pending
- 2019-07-29 CN CN201980047517.7A patent/CN112425024A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009259762A (en) * | 2008-03-28 | 2009-11-05 | Hitachi Ltd | Power source having a plurality of relays |
| JP2015171305A (en) * | 2014-03-11 | 2015-09-28 | オムロンオートモーティブエレクトロニクス株式会社 | power supply circuit |
| CN108023583A (en) * | 2016-10-28 | 2018-05-11 | 矢崎总业株式会社 | Control apparatus of semiconductor switch |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6648217B2 (en) | 2020-02-14 |
| WO2020031779A1 (en) | 2020-02-13 |
| DE112019003939T5 (en) | 2021-05-06 |
| JP2020025383A (en) | 2020-02-13 |
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