CN114914988A - Bidirectional charging and discharging equipment, control method thereof and storage medium - Google Patents
Bidirectional charging and discharging equipment, control method thereof and storage medium Download PDFInfo
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- CN114914988A CN114914988A CN202210608328.6A CN202210608328A CN114914988A CN 114914988 A CN114914988 A CN 114914988A CN 202210608328 A CN202210608328 A CN 202210608328A CN 114914988 A CN114914988 A CN 114914988A
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention provides bidirectional charge and discharge equipment, a control method thereof and a storage medium, wherein the bidirectional charge and discharge equipment at least comprises an energy storage device, an energy storage charge and discharge conversion device and an equipment charge and discharge conversion device; the energy storage device is used as a starting power supply of the bidirectional charging and discharging equipment in a discharging mode, so that the bidirectional charging and discharging equipment can be started without an external power supply; the equipment charging and discharging conversion device receives a discharging voltage from a vehicle end in a discharging mode; under the mode of discharging, can gather the conversion voltage of car end, and based on the conversion voltage of car end is selected energy memory is as the power supply that discharges, perhaps, selects the car end is as the power supply that discharges, like this, can still can supply power to two-way charging and discharging equipment when arbitrary party breaks down, and has avoided energy memory to discharge always, reduces the phenomenon that energy memory overdischarged, prolongs energy memory's life, and then has improved two-way charging and discharging equipment practicality.
Description
Technical Field
The invention relates to the technical field of electric vehicle charging and discharging, and particularly provides bidirectional charging and discharging equipment, a control method thereof and a storage medium.
Background
Along with the popularization of electric automobiles, the battery capacity of the electric automobiles is gradually increased, the charging modes are diversified, and the existing direct-current high-power charging is limited by places and cannot be fully covered; ac charging is also subject to the current at the vehicle ac port and the charging post layout, which do not fully satisfy all charging requirements. The portable direct current charger can be used on a vehicle, is convenient to carry, and can supplement power at any time in an emergency, so that the portable direct current charger is very necessary. Meanwhile, with the improvement of life, the demand of people on energy supply when people play outdoors is more and more. The electric automobile is a natural energy storage unit, and the energy of the vehicle battery is inverted through the discharging equipment and is provided for other equipment to use, so that the requirements of people are greatly met. Therefore, some bidirectional charging and discharging devices capable of performing both charging and discharging have been developed.
However, in the related art, when the bidirectional charging and discharging device needs to operate in the discharging mode, the bidirectional charging and discharging device usually needs to be powered on by using an external power supply, so that the charging and discharging control device in the bidirectional charging and discharging device can normally operate after being powered on.
However, the bidirectional charging and discharging device is usually used outdoors in the discharging mode, and for the user, the user often does not carry an external power source outdoors, so that the bidirectional charging and discharging device may not be started, and the user cannot get electricity from the vehicle end, so that the practicability of the bidirectional charging and discharging device is greatly reduced.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks, the present invention is proposed to provide a bidirectional charging and discharging device, a control method thereof, and a storage medium, which solve or at least partially solve the technical problem that the bidirectional charging and discharging device requires an external power supply to start, resulting in low practicality of the bidirectional charging and discharging device.
In a first aspect, the present invention provides a method for controlling a bidirectional charging and discharging device, the bidirectional charging and discharging device at least comprising an energy storage device, an energy storage charging and discharging conversion device and a device charging and discharging conversion device; the operation modes of the bidirectional charging and discharging equipment comprise a charging mode and a discharging mode; the energy storage device is used as a starting power supply of the bidirectional charging and discharging equipment in the discharging mode, so that the bidirectional charging and discharging equipment can be started without an external power supply; the equipment charging and discharging conversion device is used for receiving a discharging voltage from a vehicle end in the discharging mode and providing a charging voltage to the vehicle end in the charging mode;
the control method comprises the following steps:
collecting the conversion voltage of the vehicle end in the discharging mode; the conversion voltage of the vehicle end is a direct-current voltage converted by the equipment charging and discharging conversion device when the vehicle end discharges;
and selecting the energy storage device as a discharge power supply based on the conversion voltage of the vehicle end, or selecting the vehicle end as the discharge power supply.
Further, in the above method for controlling bidirectional charging and discharging equipment, selecting the energy storage device as a discharging power supply based on the converted voltage of the vehicle end, or selecting the vehicle end as the discharging power supply includes:
when the conversion voltage of the vehicle end is greater than a preset voltage threshold value, selecting the vehicle end as a discharge power supply; when the conversion voltage of the vehicle end is smaller than or equal to a preset voltage threshold, selecting the energy storage device as a discharging power supply; alternatively, the first and second electrodes may be,
detecting whether the acquired conversion voltage of the energy storage device is smaller than the conversion voltage of the vehicle end; when the conversion voltage of the energy storage device is greater than or equal to the conversion voltage of the vehicle end, selecting the energy storage device as a discharging power supply; when the voltage of the energy storage device is smaller than the conversion voltage of the vehicle end, selecting the vehicle end as a discharge power supply; the conversion voltage of the energy storage device is a direct-current voltage converted by the energy storage charging and discharging conversion device when the energy storage device discharges.
Further, in the control method of the bidirectional charging and discharging device, the bidirectional charging and discharging device further includes a high-voltage bus bar respectively connected to the device charging and discharging conversion device and the vehicle end, an auxiliary power supply respectively connected to the device charging and discharging conversion device and the energy storage charging and discharging conversion device, and an external power supply interface; the external power supply interface is used for being connected with an external power supply; the method further comprises the following steps:
detecting the voltage of the energy storage device in the charging mode or the discharging mode; if the voltage of the energy storage device is detected to be smaller than a first preset voltage, controlling the auxiliary power supply or the external power supply to charge the energy storage device through the energy storage charging and discharging conversion device; and/or outputting low-voltage early warning information;
the voltage of the auxiliary power supply is derived from the direct-current voltage of the high-voltage busbar converted by the equipment charging and discharging conversion device.
Further, the method for controlling bidirectional charging and discharging equipment further includes:
in the process of controlling the auxiliary power supply or the external power supply to charge the energy storage device through the energy storage charging and discharging conversion device, if the voltage of the energy storage device is detected to be greater than or equal to a second preset voltage and smaller than a third preset voltage, controlling the energy storage charging and discharging conversion device to limit the charging current flowing to the energy storage device from the auxiliary power supply or the external power supply through the energy storage charging and discharging conversion device, so that the charging current is smaller than a first preset current value until the voltage of the energy storage device reaches the third preset voltage;
the first preset voltage is smaller than the second preset voltage, and the second preset voltage is smaller than the third preset voltage.
Further, the method for controlling bidirectional charging and discharging equipment further includes:
in the process of controlling the auxiliary power supply or the external power supply to charge the energy storage device through the energy storage charging and discharging conversion device, if the voltage of the energy storage device is detected to be smaller than a fourth preset voltage, the energy storage charging and discharging conversion device is controlled to limit the charging current of the auxiliary power supply or the external power supply to the energy storage device through the energy storage charging and discharging conversion device, so that the charging current is smaller than a second preset current value until the voltage of the energy storage device reaches the fourth preset voltage;
wherein the fourth preset voltage is less than the first preset voltage.
Further, in the above method for controlling a bidirectional charging and discharging device, before detecting whether the acquired conversion voltage of the energy storage device is less than the conversion voltage of the vehicle end, the method further includes:
detecting the voltage of the energy storage device, and if the voltage of the energy storage device is detected to be greater than a fifth preset voltage, selecting the energy storage device as a discharging power supply;
whether the conversion voltage of the energy storage device which is detected and collected is smaller than the conversion voltage of the vehicle end or not comprises the following steps:
and if the voltage of the energy storage device is detected to be smaller than or equal to the fifth preset voltage, comparing the acquired conversion voltage of the energy storage device with the acquired conversion voltage of the vehicle end.
Further, the method for controlling bidirectional charging and discharging equipment further includes:
and in the charging mode or the discharging mode, detecting the temperature of the energy storage device, and outputting high-temperature early warning information if the temperature of the energy storage device is detected to be greater than or equal to a preset temperature.
In a second aspect, the present invention provides a bidirectional charging and discharging device, comprising an energy storage device, an energy storage charging and discharging conversion device, a device charging and discharging conversion device and a charging and discharging control device;
the energy storage device is electrically connected with the energy storage charging and discharging conversion device;
the energy storage charging and discharging conversion device and the equipment charging and discharging conversion device are respectively electrically connected with the charging and discharging control device;
the operation modes of the bidirectional charging and discharging equipment comprise a charging mode and a discharging mode;
the energy storage device is used as a starting power supply of the bidirectional charging and discharging equipment in the discharging mode, so that the bidirectional charging and discharging equipment can be started without an external power supply; and after the bidirectional charging and discharging equipment is started, the bidirectional charging and discharging equipment is selected as a power supply;
the equipment charging and discharging conversion device is used for receiving a discharging voltage from a vehicle end in the discharging mode and providing a charging voltage for the vehicle end in the charging mode;
the charge and discharge control device is used for acquiring the conversion voltage of the vehicle end in the discharge mode; selecting the energy storage device as a discharge power supply based on the conversion voltage of the vehicle end, or selecting the vehicle end as the discharge power supply; the conversion voltage of the vehicle end is direct-current voltage converted by the equipment charging and discharging conversion device when the vehicle end discharges.
Further, the bidirectional charging and discharging equipment further comprises a reset switch and an electromagnetic switch;
the energy storage device is electrically connected with the energy storage charging and discharging conversion device through the reset switch and the electromagnetic switch, and the reset switch is connected with the electromagnetic switch in parallel;
the reset switch is used for being turned on after being pressed in the discharging mode, so that the energy storage device is used as a starting power supply of the bidirectional charging and discharging equipment, and is reset and turned off after the charging and discharging control device is powered on;
the electromagnetic switch is used for charging or discharging the energy storage device when the charging and discharging control device is closed under the control of the charging and discharging control device after the charging and discharging control device is powered on; and stopping charging or discharging the energy storage device when the energy storage device is disconnected under the control of the charging and discharging control device.
Further, the bidirectional charging and discharging equipment further comprises a charging and discharging adapter device;
the charging and discharging adapter device comprises a plug and a socket which are integrated into a whole;
the plug is arranged to be of a telescopic structure, and the plug and the socket are arranged to have mutual exclusivity in the use process.
Further, the bidirectional charging and discharging equipment further comprises a driving component and a position detection component;
the driving part is connected with the plug so as to extend or retract the plug;
the position detection component is used for detecting the position of the plug and/or the position of the driving component and determining the charging and discharging state of the bidirectional charging and discharging equipment according to the position of the plug and/or the position of the driving component.
Further, in the bidirectional charging and discharging device, the energy storage charging and discharging device includes a first DC/DC converter and a second DC/DC converter, or the energy storage charging and discharging device includes a bidirectional DC/DC converter.
In a third aspect, there is provided a computer readable storage medium having stored therein a plurality of program codes adapted to be loaded and executed by a processor to perform the control method of the bidirectional charging and discharging apparatus according to any one of the above.
The method is characterized in that the bidirectional charging and discharging equipment at least comprises an energy storage device, an energy storage charging and discharging conversion device and an equipment charging and discharging conversion device; the operation modes of the bidirectional charging and discharging equipment comprise a charging mode and a discharging mode; the energy storage device is used as a starting power supply of the bidirectional charging and discharging equipment in the discharging mode, so that the bidirectional charging and discharging equipment can be started without an external power supply; the equipment charging and discharging conversion device is used for receiving a discharging voltage from a vehicle end in the discharging mode and providing a charging voltage for the vehicle end in the charging mode;
the control method comprises the following steps:
collecting the conversion voltage of the vehicle end in the discharging mode; the conversion voltage of the vehicle end is a direct-current voltage converted by the equipment charging and discharging conversion device when the vehicle end discharges;
and selecting the energy storage device as a discharge power supply based on the converted voltage of the vehicle end, or selecting the vehicle end as the discharge power supply.
when the conversion voltage of the vehicle end is greater than a preset voltage threshold value, selecting the vehicle end as a discharge power supply; when the conversion voltage of the vehicle end is smaller than or equal to a preset voltage threshold, selecting the energy storage device as a discharging power supply; alternatively, the first and second liquid crystal display panels may be,
detecting whether the acquired conversion voltage of the energy storage device is smaller than the conversion voltage of the vehicle end; when the conversion voltage of the energy storage device is greater than or equal to the conversion voltage of the vehicle end, selecting the energy storage device as a discharging power supply; when the voltage of the energy storage device is smaller than the conversion voltage of the vehicle end, selecting the vehicle end as a discharge power supply; the conversion voltage of the energy storage device is the direct-current voltage converted by the energy storage charging and discharging conversion device when the energy storage device discharges.
Scheme 3. the control method of the bidirectional charge and discharge equipment according to scheme 1, characterized in that the bidirectional charge and discharge equipment further comprises a high-voltage bus bar respectively connected with the equipment charge and discharge conversion device and the vehicle end, an auxiliary power supply respectively connected with the equipment charge and discharge conversion device and the energy storage charge and discharge conversion device, and an external power supply interface; the external power supply interface is used for being connected with an external power supply; the method further comprises the following steps:
detecting the voltage of the energy storage device in the charging mode or the discharging mode; if the voltage of the energy storage device is detected to be smaller than a first preset voltage, controlling the auxiliary power supply or the external power supply to charge the energy storage device through the energy storage charging and discharging conversion device; and/or outputting low-voltage early warning information;
the voltage of the auxiliary power supply is derived from the direct-current voltage of the high-voltage busbar converted by the equipment charging and discharging conversion device.
Scheme 4. the control method of bidirectional charge and discharge equipment according to scheme 3, characterized by further comprising:
in the process of controlling the auxiliary power supply or the external power supply to charge the energy storage device through the energy storage charging and discharging conversion device, if the voltage of the energy storage device is detected to be greater than or equal to a second preset voltage and smaller than a third preset voltage, controlling the energy storage charging and discharging conversion device to limit the charging current flowing to the energy storage device from the auxiliary power supply or the external power supply through the energy storage charging and discharging conversion device, so that the charging current is smaller than a first preset current value until the voltage of the energy storage device reaches the third preset voltage;
the first preset voltage is smaller than the second preset voltage, and the second preset voltage is smaller than the third preset voltage.
Scheme 5. the control method of bidirectional charge and discharge equipment according to scheme 4, characterized by further comprising:
in the process of controlling the auxiliary power supply or the external power supply to charge the energy storage device through the energy storage charging and discharging conversion device, if the voltage of the energy storage device is detected to be smaller than a fourth preset voltage, the energy storage charging and discharging conversion device is controlled to limit the charging current of the auxiliary power supply or the external power supply to the energy storage device through the energy storage charging and discharging conversion device, so that the charging current is smaller than a second preset current value until the voltage of the energy storage device reaches the fourth preset voltage;
wherein the fourth preset voltage is less than the first preset voltage.
Scheme 6. the control method of bidirectional charge and discharge equipment according to scheme 2, before detecting whether the acquired conversion voltage of the energy storage device is less than the conversion voltage of the vehicle end, further includes:
detecting the voltage of the energy storage device, and if the voltage of the energy storage device is detected to be greater than a fifth preset voltage, selecting the energy storage device as a discharging power supply;
whether the conversion voltage of the energy storage device which is detected and collected is smaller than the conversion voltage of the vehicle end or not comprises the following steps:
and if the voltage of the energy storage device is detected to be smaller than or equal to the fifth preset voltage, comparing the acquired conversion voltage of the energy storage device with the acquired conversion voltage of the vehicle end.
Scheme 7. the control method of bidirectional charge and discharge equipment according to scheme 1, further comprising:
and in the charging mode or the discharging mode, detecting the temperature of the energy storage device, and if the temperature of the energy storage device is detected to be greater than or equal to a preset temperature, outputting high-temperature early warning information.
Scheme 8. a two-way charge and discharge equipment, characterized by, including energy storage device, energy storage charge and discharge conversion equipment, equipment charge and discharge conversion equipment and charge and discharge controlling means;
the energy storage device is electrically connected with the energy storage charging and discharging conversion device;
the energy storage charging and discharging conversion device and the equipment charging and discharging conversion device are respectively electrically connected with the charging and discharging control device;
the operation modes of the bidirectional charging and discharging equipment comprise a charging mode and a discharging mode;
the energy storage device is used as a starting power supply of the bidirectional charging and discharging equipment in the discharging mode, so that the bidirectional charging and discharging equipment can be started without an external power supply; and after the bidirectional charging and discharging equipment is started, the bidirectional charging and discharging equipment is selected as a power supply;
the equipment charging and discharging conversion device is used for receiving a discharging voltage from a vehicle end in the discharging mode and providing a charging voltage for the vehicle end in the charging mode;
the charging and discharging control device is used for acquiring the conversion voltage of the vehicle end in the discharging mode; selecting the energy storage device as a discharge power supply based on the conversion voltage of the vehicle end, or selecting the vehicle end as the discharge power supply; the conversion voltage of the vehicle end is direct-current voltage converted by the equipment charging and discharging conversion device when the vehicle end discharges.
Scheme 9. the bidirectional charge and discharge device according to scheme 8, further comprising a reset switch and an electromagnetic switch;
the energy storage device is electrically connected with the energy storage charging and discharging conversion device through the reset switch and the electromagnetic switch, and the reset switch is connected with the electromagnetic switch in parallel;
the reset switch is used for being turned on after being pressed in the discharging mode, so that the energy storage device is used as a starting power supply of the bidirectional charging and discharging equipment, and is reset and turned off after the charging and discharging control device is powered on;
the electromagnetic switch is used for charging or discharging the energy storage device when the charging and discharging control device is closed under the control of the charging and discharging control device after the charging and discharging control device is powered on; and stopping charging or discharging the energy storage device when the energy storage device is disconnected under the control of the charging and discharging control device.
Scheme 10. the bidirectional charge and discharge device according to scheme 8, further comprising a charge and discharge adapter;
the charging and discharging adapter device comprises a plug and a socket which are integrated into a whole;
the plug is arranged to be of a telescopic structure, and the plug and the socket are arranged to have mutual exclusivity in the use process.
the driving part is connected with the plug so as to extend or retract the plug;
the position detection component is used for detecting the position of the plug and/or the position of the driving component and determining the charging and discharging state of the bidirectional charging and discharging equipment according to the position of the plug and/or the position of the driving component.
The bidirectional charging and discharging device of claim 12, wherein the energy storage charging and discharging device comprises a first DC/DC converter and a second DC/DC converter, or the energy storage charging and discharging device comprises a bidirectional DC/DC converter.
One or more technical schemes of the invention at least have one or more of the following beneficial effects:
in the technical scheme of the implementation of the invention, an energy storage device, an energy storage charge-discharge conversion device and a device charge-discharge conversion device are integrated in a bidirectional charge-discharge device, under the discharge mode of the bidirectional charge-discharge device, the energy storage device is used as a starting power supply to initially supply power to devices to be supplied with power except the energy storage device in the bidirectional charge-discharge device through the energy storage charge-discharge conversion device, so that the bidirectional charge-discharge device is started, the voltage at the vehicle end is discharged through the bidirectional charge-discharge device, after the bidirectional charge-discharge device is started, the bidirectional charge-discharge device operates in the discharge mode, the energy storage device is selected as a discharge power supply according to the converted voltage at the vehicle end, or the vehicle end is selected as a discharge power supply, so that the bidirectional charge-discharge device can still be supplied with power when any one of the two-discharge devices fails, and the energy storage device is prevented from discharging all the time, the phenomenon of over-discharging of the energy storage device is reduced, and the service life of the energy storage device is prolonged. By adopting the technical scheme of the invention, the practicability of the bidirectional charging and discharging equipment can be improved.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present invention. Moreover, in the drawings, like numerals are used to indicate like parts, and in which:
fig. 1 is a main structural block diagram of a bidirectional charging and discharging device according to an embodiment of the present invention;
fig. 2 is a flow chart illustrating main steps of a control method of a bidirectional charging and discharging device according to an embodiment of the present invention;
fig. 3 is a main structural block diagram of a bidirectional charging and discharging device according to another embodiment of the present invention;
fig. 4 is a main structural block diagram of a bidirectional charging and discharging device according to still another embodiment of the present invention.
Detailed Description
Some embodiments of the invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, a "module" or "processor" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, may comprise software components such as program code, or may be a combination of software and hardware. The processor may be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and/or signal processing functionality. The processor may be implemented in software, hardware, or a combination thereof. Non-transitory computer readable storage media include any suitable medium that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random-access memory, and the like. The term "a and/or B" denotes all possible combinations of a and B, such as a alone, B alone or a and B. The term "at least one A or B" or "at least one of A and B" means similar to "A and/or B" and may include only A, only B, or both A and B. The singular forms "a", "an" and "the" may include the plural forms as well.
Along with electric automobile's popularization, people play outdoors can utilize two-way charge-discharge equipment to carry out the contravariant to the energy of vehicle battery, realize getting the electricity from the car end, play outdoors and provide more convenient condition. However, when the bidirectional charging and discharging device needs to operate in the discharging mode, the bidirectional charging and discharging device generally needs to be started to supply power by using an external power supply, so that the charging and discharging control device in the bidirectional charging and discharging device can normally operate after being powered on.
However, the bidirectional charging and discharging device is usually used outdoors in the discharging mode, and for the user, the user often does not carry an external power source outdoors, so that the bidirectional charging and discharging device may not be started, and the user cannot get electricity from the vehicle end, so that the practicability of the bidirectional charging and discharging device is greatly reduced.
Therefore, in order to solve the above technical problems, the present invention provides the following technical solutions:
referring to fig. 1, fig. 1 is a main structural block diagram of a bidirectional charging and discharging apparatus according to an embodiment of the present invention, and as shown in fig. 1, the bidirectional charging and discharging apparatus 1 of this embodiment at least includes an energy storage device 11, an energy storage charging and discharging conversion device 12, an apparatus charging and discharging conversion device 13, and a charging and discharging control device 14. The energy storage device 11 is electrically connected with the energy storage charging and discharging conversion device 12; the energy storage charging and discharging conversion device 12 and the equipment charging and discharging conversion device 13 are electrically connected with the charging and discharging control device 14 respectively.
In a specific implementation, the operation mode of the bidirectional charging and discharging device 1 includes a charging mode and a discharging mode. The energy storage device 11 is used as a starting power supply of the bidirectional charging and discharging equipment 1 in the discharging mode, so that the bidirectional charging and discharging equipment 1 can realize electroless starting without an external power supply; and is selected as a power supply source after the bidirectional charge and discharge device 1 is started. The device charging and discharging conversion device 13 is configured to receive a discharging voltage from the vehicle end 2 in the discharging mode, and provide a charging voltage to the vehicle end 2 in the charging mode.
The charge and discharge control device 14 may be configured to perform the following control method of the bidirectional charge and discharge apparatus 1:
referring to fig. 2, fig. 2 is a schematic flow chart illustrating main steps of a control method of a bidirectional charging and discharging device according to an embodiment of the present invention. As shown in fig. 2, the method for controlling the bidirectional charging and discharging device 1 according to the embodiment of the present invention mainly includes the following steps 101 to 103.
in a specific implementation process, in the discharging mode, after the voltage of the energy storage device 11 is converted by the energy storage charging and discharging conversion device 12, the energy storage device 11 may supply power, and at this time, both the power-consuming components (such as the charging and discharging control device 14) in the bidirectional charging and discharging device 1 and the power-consuming components in the bidirectional charging and discharging device 1 may be powered. When the electric components in the bidirectional charging and discharging equipment 1 are powered on, the bidirectional charging and discharging equipment 1 is started to enter a discharging mode, and then the converted voltage of the vehicle end 2 can be acquired through the voltage sensor.
102, selecting the energy storage device 11 as a discharge power supply based on the conversion voltage of the vehicle end 2, or selecting the vehicle end 2 as the discharge power supply;
in a specific implementation process, since the capacity of the energy storage device 11 is much smaller than the battery capacity of the vehicle end 2, the vehicle end can be directly used as a discharge power source after the converted voltage of the vehicle end 2 is detected. Specifically, a preset voltage threshold, for example, 0V, may be set, and when the converted voltage of the vehicle end is greater than the preset voltage threshold, it indicates that the voltage of the vehicle end is input to the bidirectional charging and discharging device, and the vehicle end 2 may be selected as the discharging power supply; when the converted voltage of the vehicle end is greater than the preset voltage threshold, it indicates that the voltage of the vehicle end is not input to the bidirectional charging and discharging equipment, and the energy storage device 11 may be selected as a discharging power supply.
In a specific implementation process, the conversion voltage of the energy storage device 11 may be collected by a voltage sensor, where the conversion voltage of the energy storage device 11 is a dc voltage converted by the energy storage charging and discharging conversion device 12 when the energy storage device 11 discharges. The converted voltage of the energy storage device 11 is compared with the converted voltage of the vehicle end 2 to detect whether the converted voltage of the energy storage device 11 is smaller than the converted voltage of the vehicle end 2. When the voltage of the energy storage device 11 is smaller than the conversion voltage of the vehicle end 2, the vehicle end 2 is selected as a discharging power source, so that the energy storage device 11 does not need to be used for discharging all the time, and the capacity of the energy storage device 11 is far smaller than the battery capacity of the vehicle end 2, so that the electric energy of the energy storage device 11 is prevented from being exhausted, the operation of the bidirectional charging and discharging equipment 1 cannot be maintained, and the phenomenon that the energy storage device 11 is over-discharged is avoided. Meanwhile, the phenomenon that the bidirectional charging and discharging equipment 1 cannot normally operate because the power-on state of the charging and discharging control device 14 cannot be maintained under abnormal conditions (such as the fault of the energy storage charging and discharging conversion device 12) can also be avoided. When the conversion voltage of the energy storage device 11 is greater than or equal to the conversion voltage of the vehicle end 2, the energy storage device 11 is selected as a discharge power supply, so that some emergency situations, such as the abnormality of the device charge-discharge conversion device 13, that the voltage of the vehicle end 2 cannot be converted into the required direct current to maintain the power-on state of the charge-discharge control device 14, can be avoided, and the energy storage device 11 can be used as the discharge power supply to maintain the power-on state of the charge-discharge control device 14, thereby ensuring the normal operation of the bidirectional charge-discharge device 1.
In the control method of the bidirectional charging and discharging equipment 1 of the embodiment, the energy storage device 11, the energy storage charging and discharging conversion device 12 and the equipment charging and discharging conversion device 13 are integrated in the bidirectional charging and discharging equipment 1, in the discharging mode of the bidirectional charging and discharging equipment 1, the energy storage device 11 is used as a starting power supply to perform initial power supply to the devices to be powered in the bidirectional charging and discharging equipment 1 except the energy storage device 11 through the energy storage charging and discharging conversion device 12, so that the bidirectional charging and discharging equipment 1 is started, the voltage of the vehicle end 2 is discharged through the bidirectional charging and discharging equipment 1, after the bidirectional charging and discharging equipment 1 is started, when the bidirectional charging and discharging equipment 1 operates in the discharging mode, the energy storage device 11 is selected as a discharging power supply according to the conversion voltage of the vehicle end 2, or the vehicle end 2 is selected as a discharging power supply, so that when any one of the two of the charging and discharging equipment 1 fails, the bidirectional charging and discharging equipment 1 can still be powered, the phenomenon that the energy storage device 11 discharges all the time is avoided, the phenomenon that the energy storage device 11 discharges excessively is reduced, and the service life of the energy storage device 11 is prolonged. By adopting the technical scheme of the invention, the practicability of the bidirectional charging and discharging equipment 1 can be improved.
In a specific implementation process, as shown in fig. 1, the bidirectional charging and discharging device 1 of this embodiment may further include a high-voltage bus 15 connected to the device charging and discharging conversion device 13 and the vehicle end 2, an auxiliary power supply 16 connected to the device charging and discharging conversion device 13 and the energy storage charging and discharging conversion device 12, and an external power supply interface 17; the external power interface 17 is used for connecting with an external power source. It can be understood that the bidirectional charging and discharging device 1 of the present embodiment may further include a dc gun (not shown in the drawings) and a control switch (not shown in the drawings), and the high-voltage bus bar 15 is connected to the vehicle end 2 through the control switch and the dc gun. The control switch is used for controlling the disconnection and the connection between the high-voltage busbar 15 and the direct-current gun.
In a specific implementation process, the control method of the bidirectional charging and discharging device 1 according to this embodiment may further perform the following operations:
detecting the voltage of the energy storage device 11 in a charging mode of the bidirectional charging and discharging equipment 1 or a discharging mode of the bidirectional charging and discharging equipment 1; and if the voltage of the energy storage device 11 is detected to be smaller than a first preset voltage, controlling the auxiliary power supply 16 or an external power supply to charge the energy storage device 11 through the energy storage charging and discharging conversion device 12, and/or outputting low-voltage early warning information.
Specifically, no matter in the charging mode of the bidirectional charging and discharging device 1 or in the discharging mode of the bidirectional charging and discharging device 1, the voltage of the energy storage device 11 may be collected in real time, and it is detected whether the voltage of the energy storage device 11 is smaller than a first preset voltage. If it is detected that the voltage of the energy storage device 11 is smaller than the first preset voltage, which indicates that the electric quantity of the energy storage device 11 is low, at this time, the auxiliary power supply 16 or the external power supply may be controlled to charge the energy storage device 11 via the energy storage charging and discharging conversion device 12, and/or low-voltage warning information may be output.
The voltage of the auxiliary power supply 16 is derived from the dc voltage of the high-voltage bus bar 15 converted by the device charging and discharging conversion device 13.
Specifically, in a charging mode of the bidirectional charging and discharging device 1, the alternating current of the charging pile is rectified into high-voltage direct current through an alternating current-direct current change component in the device charging and discharging conversion device 13, the high-voltage direct current charges the vehicle end 2 through the high-voltage bus bar 15, the high-voltage direct current on the high-voltage bus bar 15 is converted into low-voltage direct current for the auxiliary power supply 16 through the direct current change component in the device charging and discharging conversion device 13, the auxiliary power supply 16 is converted through the energy storage charging and discharging conversion device 12 to obtain charging voltage required by the energy storage device 11, and therefore the energy storage device 11 is charged. The alternating current/direct current changing component in the device charging/discharging converting device 13 may be a bidirectional AC/DC converter, and the direct current changing component in the device charging/discharging converting device 13 may be a unidirectional DC/DC step-down transformer.
In the discharging mode of the bidirectional charging and discharging equipment 1, high-voltage direct current at the vehicle end 2 is input to the equipment charging and discharging conversion device 13 through the high-voltage bus bar 15, and an alternating current and direct current change assembly in the equipment charging and discharging conversion device 13 inverts the high-voltage direct current into alternating current and then outputs the alternating current. The high-voltage direct current on the high-voltage bus bar 15 is converted into low-voltage direct current for the auxiliary power supply 16 through a direct current change component in the equipment charging and discharging conversion device 13, and the auxiliary power supply 16 is converted through the energy storage charging and discharging conversion device 12 to obtain charging voltage required by the energy storage device 11, so that the energy storage device 11 is charged.
In a specific implementation process, in the process of controlling the auxiliary power supply 16 or the external power supply to charge the energy storage device 11 through the energy storage charging and discharging conversion device 12, the voltage of the energy storage device 11 may still be collected in real time, and the voltage of the energy storage device 11 is detected, if it is detected that the voltage of the energy storage device 11 is greater than or equal to the second preset voltage and is less than the third preset voltage, it indicates that the energy storage device 11 will be fully charged, and at this time, in order to prevent the energy storage device 11 from being overcharged, the energy storage device 11 may be trickle charged with a small current. Specifically, the energy storage charging and discharging conversion device 12 may be controlled to limit the charging current flowing from the auxiliary power source 16 or the external power source to the energy storage device 11 through the energy storage charging and discharging conversion device 12, so that the charging current is smaller than a first preset current value until the voltage of the energy storage device 11 reaches a third preset voltage, which indicates that the energy storage device 11 is fully charged, and at this time, the charging of the energy storage device 11 may be stopped. The first preset voltage is smaller than the second preset voltage, and the second preset voltage is smaller than the third preset voltage.
In a specific implementation process, a fourth preset voltage smaller than the first preset voltage may be further set to detect whether the energy storage device 11 is overdischarged, so that in an initial charging stage of the energy storage device 11, a smaller current is used for charging to prevent the larger current from causing impact on the energy storage device 11. Therefore, in the process of controlling the auxiliary power supply 16 or the external power supply to charge the energy storage device 11 through the energy storage charging and discharging conversion device 12, if it is detected that the voltage of the energy storage device 11 is less than a fourth preset voltage, it indicates that the energy storage device 11 is overdischarged, at this time, the energy storage charging and discharging conversion device 12 may be controlled to limit the charging current flowing from the auxiliary power supply 16 or the external power supply to the energy storage device 11 through the energy storage charging and discharging conversion device 12, so that the charging current is less than a second preset current value until the voltage of the energy storage device 11 reaches the fourth preset voltage.
In a specific implementation process, the over-discharge voltage threshold of the energy storage device 11 may be set to be 1.5V (fourth preset voltage), the charging voltage threshold of the energy storage device 11 is 2V (first preset voltage), the voltage threshold of the energy storage device 11 to be charged is 4.1V (second preset voltage), and the full-charge voltage threshold of the energy storage device 11 is 4.2V (third preset voltage).
When detecting that the voltage of energy storage device 11 is 1V, satisfy the charging condition of energy storage device 11, at this moment, because the voltage of energy storage device 11 is less than fourth preset voltage, can charge the current-limiting, earlier charge energy storage device 11 with the undercurrent, when the voltage of energy storage device 11 reaches 1.5V, can utilize great electric current to charge energy storage device 11, when the voltage of energy storage device 11 reaches 4.1V, can charge the current-limiting again, charge energy storage device 11 with the undercurrent, when the voltage of energy storage device 11 reaches 4.2V, stop charging.
When detecting that the voltage of the energy storage device 11 is 1.6V, the charging condition of the energy storage device 11 is satisfied, at this time, because the voltage of the energy storage device 11 is greater than the fourth preset voltage, the energy storage device 11 can be directly charged by using a larger current, when the voltage of the energy storage device 11 reaches 4.1V, the current limitation of charging can be performed again, the energy storage device 11 is charged by a small current, and the charging is stopped until the voltage of the energy storage device 11 reaches 4.2V.
In a specific implementation process, before "detecting whether the acquired conversion voltage of the energy storage device 11 is smaller than the acquired conversion voltage of the vehicle end 2" in step 101 of the above embodiment, the voltage of the energy storage device 11 may also be detected, and if it is detected that the voltage of the energy storage device 11 is larger than a fifth preset voltage, it indicates that the voltage of the energy storage device 11 is too high, at this time, the energy storage device 11 may be selected as a discharge power source to discharge the energy storage device 11, so that the voltage of the energy storage device 11 is maintained within a reasonable voltage range. With the discharging of the energy storage device 11, the voltage of the energy storage device 11 is less than or equal to the fifth preset voltage, the step of "comparing the collected converted voltage of the energy storage device 11 with the collected converted voltage of the vehicle end" in the step 101 may be executed, that is, when the voltage of the energy storage device 11 is too high, the energy storage device 11 is preferentially used as a discharging power source, the voltage of the energy storage device 11 is within a reasonable range, and the energy storage device 11 and the vehicle end 2 compete for power supply.
In a specific implementation process, the temperature of the energy storage device 11 may be detected in a charging mode of the bidirectional charging and discharging device 1, or in a discharging mode of the bidirectional charging and discharging device 1, and if the temperature of the energy storage device 11 is detected to be greater than or equal to a preset temperature, high-temperature early warning information is output.
It should be noted that, although the foregoing embodiments describe each step in a specific sequence, those skilled in the art will understand that, in order to achieve the effect of the present invention, different steps do not necessarily need to be executed in such a sequence, and they may be executed simultaneously (in parallel) or in other sequences, and these changes are all within the protection scope of the present invention.
Fig. 3 is a main structural block diagram of a bidirectional charging and discharging device according to another embodiment of the present invention. As shown in fig. 3, the bidirectional charging and discharging device 1 of the present embodiment may further include a reset switch K1 and an electromagnetic switch K2 on the basis of the embodiment shown in fig. 1. The energy storage device 11 is electrically connected with the energy storage charging and discharging conversion device 12 through the reset switch K1 and the electromagnetic switch K2, and the reset switch K1 is connected in parallel with the electromagnetic switch K2.
The reset switch K1 is configured to be turned on when pressed in the discharging mode, so that the energy storage device 11 serves as a starting power source of the bidirectional charging and discharging apparatus 1, and is reset to be turned off when the charging and discharging control device 14 is powered on.
The electromagnetic switch K2 is used for charging or discharging the energy storage device 11 when the charging and discharging control device 14 is powered on and closed under the control of the charging and discharging control device 14; and stopping charging or discharging the energy storage device 11 when the battery is disconnected under the control of the charging and discharging control device 14.
In a specific implementation, as shown in fig. 3, the bidirectional charging and discharging device 1 may further include a charging and discharging adapter 18. The charging and discharging adapter device 18 comprises an integrated plug and socket; the plug is arranged to be of a telescopic structure, and the plug and the socket are arranged to have mutual exclusivity in the use process.
Specifically, the bidirectional charging and discharging device 1 further includes a driving part (not shown in the drawings) and a position detecting unit (not shown in the drawings). The driving part is connected with the plug so as to extend or retract the plug; the position detection component is used for detecting the position of the plug and/or the position of the driving component, and determining the charging and discharging state of the bidirectional charging and discharging equipment 1 according to the position of the plug and/or the position of the driving component.
In a concrete realization in-process, driver part can include connecting rod (no longer show in the picture) and apron (no longer show in the picture), and the one end of connecting rod links to each other with the plug, and it stretches out or contracts to drive the plug, and the other end of connecting rod links to each other with the apron, and when the connecting rod drove the plug and stretches out, can the linkage drive apron covered the socket, and like this, only the plug can be used, and when the connecting rod drove the plug shrink, can the linkage drive apron spill the socket, and like this, only the socket can be used.
In a specific implementation process, the position detection component may directly detect the position of the plug, and then determine the charge and discharge state of the bidirectional charge and discharge device 1 according to the position of the plug, and may also drive the position of the component, and determine the charge and discharge state of the bidirectional charge and discharge device 1 according to the position of the drive component.
In a specific implementation process, a first switch (not shown in the figure) can be arranged between the plug and the cable, a second switch (not shown in the figure) is arranged between the plug and the cable, and only the plug or the socket is used by controlling the opening or closing of the first switch and the opening or closing of the second switch. Specifically, it is possible to detect the position of the plug using the position detection part, then determine the charge and discharge state of the bidirectional charge and discharge device 1 according to the position of the plug, then control the opening or closing of the first switch, and control the opening or closing of the two switches, so that only the socket or the plug is used.
In a specific implementation, the energy storage and discharge device may include a first DC/DC converter and a second DC/DC converter, or the energy storage and discharge device may include a bidirectional DC/DC converter.
Specifically, referring to fig. 4, fig. 4 is a main structural block diagram of a bidirectional charging and discharging device according to still another embodiment of the present invention. As shown in fig. 4, in the embodiment, the energy storage charging and discharging device may include a first DC/DC converter 121 and a second DC/DC converter 122, and other structures are the same as those in fig. 3, which are not described herein again.
It is understood that the charge and discharge control device 14 may include a human-computer interaction component, a detection component, a driving control component, a charge and discharge control component, etc., which are not shown in this figure.
The human-computer interaction assembly is used for displaying the energy storage device 11, faults in the charging and discharging process and the like, the detection assembly is used for acquiring related voltage information and the like, the driving control assembly is used for controlling disconnection or connection between the high-voltage bus bar 15 and the vehicle end 2, and the charging and discharging control assembly is used for sending messages in the charging and discharging process, charging and discharging the energy storage device 11, sending related instructions in the charging and discharging process and the like.
In the above-mentioned bidirectional charging and discharging device 1 for implementing the control method embodiment of the bidirectional charging and discharging device 1 of the above-mentioned embodiment, the technical principles, the solved technical problems and the generated technical effects of the two are similar, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process and related descriptions of the bidirectional charging and discharging device 1 may refer to the contents described in the embodiment of the control method of the bidirectional charging and discharging device 1, and are not repeated here.
It will be understood by those skilled in the art that all or part of the flow of the method according to the above-described embodiment may be implemented by a computer program, which may be stored in a computer-readable storage medium and used to implement the steps of the above-described embodiments of the method when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable storage medium may include: any entity or device capable of carrying said computer program code, medium, U.S. disk, removable hard disk, magnetic diskette, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunications signal, software distribution medium, or the like. It should be noted that the computer-readable storage medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer-readable storage media may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
Further, the invention also provides a computer readable storage medium. In one computer-readable storage medium embodiment according to the present invention, the computer-readable storage medium may be configured to store a program that executes the control method of the bidirectional charging and discharging device 1 of the above-described method embodiment, and the program may be loaded and executed by a processor to implement the control method of the above-described bidirectional charging and discharging device 1. For convenience of explanation, only the parts related to the embodiments of the present invention are shown, and details of the specific techniques are not disclosed. The computer-readable storage medium may be a storage device formed by including various electronic devices, and optionally, the computer-readable storage medium is a non-transitory computer-readable storage medium in an embodiment of the present invention.
Further, it should be understood that, since the configuration of each module is only for explaining the functional units of the apparatus of the present invention, the corresponding physical devices of the modules may be the processor itself, or a part of software, a part of hardware, or a part of a combination of software and hardware in the processor. Thus, the number of individual modules in the figures is merely illustrative.
Those skilled in the art will appreciate that the various modules in the apparatus may be adaptively split or combined. Such splitting or combining of specific modules does not cause the technical solutions to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or combining will fall within the protection scope of the present invention.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. The control method of the two-way charging and discharging equipment is characterized in that the two-way charging and discharging equipment at least comprises an energy storage device, an energy storage charging and discharging conversion device and an equipment charging and discharging conversion device; the operation modes of the bidirectional charging and discharging equipment comprise a charging mode and a discharging mode; the energy storage device is used as a starting power supply of the bidirectional charging and discharging equipment in the discharging mode, so that the bidirectional charging and discharging equipment can be started without an external power supply; the equipment charging and discharging conversion device is used for receiving a discharging voltage from a vehicle end in the discharging mode and providing a charging voltage for the vehicle end in the charging mode;
the control method comprises the following steps:
collecting the conversion voltage of the vehicle end in the discharging mode; the conversion voltage of the vehicle end is a direct-current voltage converted by the equipment charging and discharging conversion device when the vehicle end discharges;
and selecting the energy storage device as a discharge power supply based on the conversion voltage of the vehicle end, or selecting the vehicle end as the discharge power supply.
2. The method for controlling bidirectional charging and discharging equipment according to claim 1, wherein selecting the energy storage device as a discharging power supply based on the converted voltage of the vehicle end, or selecting the vehicle end as the discharging power supply comprises:
when the conversion voltage of the vehicle end is greater than a preset voltage threshold value, selecting the vehicle end as a discharge power supply; when the conversion voltage of the vehicle end is smaller than or equal to a preset voltage threshold, selecting the energy storage device as a discharging power supply; alternatively, the first and second electrodes may be,
detecting whether the acquired conversion voltage of the energy storage device is smaller than the conversion voltage of the vehicle end; when the conversion voltage of the energy storage device is greater than or equal to the conversion voltage of the vehicle end, selecting the energy storage device as a discharging power supply; when the voltage of the energy storage device is smaller than the conversion voltage of the vehicle end, selecting the vehicle end as a discharge power supply; the conversion voltage of the energy storage device is the direct-current voltage converted by the energy storage charging and discharging conversion device when the energy storage device discharges.
3. The control method of the bidirectional charging and discharging equipment according to claim 1, wherein the bidirectional charging and discharging equipment further comprises a high-voltage bus bar respectively connected with the equipment charging and discharging conversion device and the vehicle end, an auxiliary power supply respectively connected with the equipment charging and discharging conversion device and the energy storage charging and discharging conversion device, and an external power supply interface; the external power supply interface is used for being connected with an external power supply; the method further comprises the following steps:
detecting the voltage of the energy storage device in the charging mode or the discharging mode; if the voltage of the energy storage device is detected to be smaller than a first preset voltage, controlling the auxiliary power supply or the external power supply to charge the energy storage device through the energy storage charging and discharging conversion device; and/or outputting low-voltage early warning information;
the voltage of the auxiliary power supply is derived from the direct-current voltage of the high-voltage busbar converted by the equipment charging and discharging conversion device.
4. The control method of the bidirectional charging and discharging device according to claim 3, further comprising:
in the process of controlling the auxiliary power supply or the external power supply to charge the energy storage device through the energy storage charging and discharging conversion device, if the voltage of the energy storage device is detected to be greater than or equal to a second preset voltage and smaller than a third preset voltage, controlling the energy storage charging and discharging conversion device to limit the charging current flowing to the energy storage device from the auxiliary power supply or the external power supply through the energy storage charging and discharging conversion device, so that the charging current is smaller than a first preset current value until the voltage of the energy storage device reaches the third preset voltage;
the first preset voltage is smaller than the second preset voltage, and the second preset voltage is smaller than the third preset voltage.
5. The control method of the bidirectional charging and discharging device according to claim 4, further comprising:
in the process of controlling the auxiliary power supply or the external power supply to charge the energy storage device through the energy storage charging and discharging conversion device, if the voltage of the energy storage device is detected to be smaller than a fourth preset voltage, the energy storage charging and discharging conversion device is controlled to limit the charging current of the auxiliary power supply or the external power supply to the energy storage device through the energy storage charging and discharging conversion device, so that the charging current is smaller than a second preset current value until the voltage of the energy storage device reaches the fourth preset voltage;
wherein the fourth preset voltage is less than the first preset voltage.
6. The method for controlling bidirectional charging and discharging equipment according to claim 2, before detecting whether the acquired converted voltage of the energy storage device is less than the converted voltage of the vehicle end, further comprising:
detecting the voltage of the energy storage device, and if the voltage of the energy storage device is detected to be greater than a fifth preset voltage, selecting the energy storage device as a discharging power supply;
whether the conversion voltage of the energy storage device which is detected and collected is smaller than the conversion voltage of the vehicle end or not comprises the following steps:
and if the voltage of the energy storage device is detected to be smaller than or equal to the fifth preset voltage, comparing the acquired conversion voltage of the energy storage device with the acquired conversion voltage of the vehicle end.
7. The control method of the bidirectional charging and discharging device according to claim 1, further comprising:
and in the charging mode or the discharging mode, detecting the temperature of the energy storage device, and outputting high-temperature early warning information if the temperature of the energy storage device is detected to be greater than or equal to a preset temperature.
8. A bidirectional charge and discharge device is characterized by comprising an energy storage device, an energy storage charge and discharge conversion device, a device charge and discharge conversion device and a charge and discharge control device;
the energy storage device is electrically connected with the energy storage charging and discharging conversion device;
the energy storage charging and discharging conversion device and the equipment charging and discharging conversion device are respectively electrically connected with the charging and discharging control device;
the operation modes of the bidirectional charging and discharging equipment comprise a charging mode and a discharging mode;
the energy storage device is used as a starting power supply of the bidirectional charging and discharging equipment in the discharging mode, so that the bidirectional charging and discharging equipment can be started without an external power supply; and after the bidirectional charging and discharging equipment is started, the bidirectional charging and discharging equipment is selected as a power supply;
the equipment charging and discharging conversion device is used for receiving a discharging voltage from a vehicle end in the discharging mode and providing a charging voltage for the vehicle end in the charging mode;
the charging and discharging control device is used for acquiring the conversion voltage of the vehicle end in the discharging mode; selecting the energy storage device as a discharge power supply based on the conversion voltage of the vehicle end, or selecting the vehicle end as the discharge power supply; the conversion voltage of the vehicle end is a direct-current voltage converted by the equipment charging and discharging conversion device when the vehicle end discharges.
9. The bidirectional charging and discharging device according to claim 8, further comprising a reset switch and an electromagnetic switch;
the energy storage device is electrically connected with the energy storage charging and discharging conversion device through the reset switch and the electromagnetic switch, and the reset switch is connected with the electromagnetic switch in parallel;
the reset switch is used for being turned on after being pressed in the discharging mode, so that the energy storage device is used as a starting power supply of the bidirectional charging and discharging equipment, and is reset and turned off after the charging and discharging control device is powered on;
the electromagnetic switch is used for charging or discharging the energy storage device when the charging and discharging control device is closed under the control of the charging and discharging control device after the charging and discharging control device is electrified; and stopping charging or discharging the energy storage device when the energy storage device is disconnected under the control of the charging and discharging control device.
10. The bidirectional charging and discharging device according to claim 8, further comprising a charging and discharging adapter means;
the charging and discharging adapter device comprises a plug and a socket which are integrated into a whole;
the plug is arranged to be of a telescopic structure, and the plug and the socket are arranged to have mutual exclusivity in the use process.
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| CN202210608328.6A CN114914988A (en) | 2022-05-31 | 2022-05-31 | Bidirectional charging and discharging equipment, control method thereof and storage medium |
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| CN202210608328.6A CN114914988A (en) | 2022-05-31 | 2022-05-31 | Bidirectional charging and discharging equipment, control method thereof and storage medium |
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