CN113942404B - Charging and discharging system, vehicle and alternating current/direct current power supply selection circuit - Google Patents

Charging and discharging system, vehicle and alternating current/direct current power supply selection circuit Download PDF

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Publication number
CN113942404B
CN113942404B CN202010617171.4A CN202010617171A CN113942404B CN 113942404 B CN113942404 B CN 113942404B CN 202010617171 A CN202010617171 A CN 202010617171A CN 113942404 B CN113942404 B CN 113942404B
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China
Prior art keywords
power supply
charging
unit
alternating current
discharging
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CN202010617171.4A
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Chinese (zh)
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CN113942404A (en
Inventor
李想想
石雷
罗建兴
王旭东
陈明文
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BYD Co Ltd
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BYD Co Ltd
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
    • 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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00045—Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/40—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries adapted for charging from various sources, e.g. AC, DC or multivoltage
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a charging and discharging system, a vehicle and an alternating current/direct current power supply selection circuit. The power distribution module comprises a direct current relay unit and an alternating current relay, wherein the direct current relay unit is used for being closed during direct current charging and discharging and is disconnected during alternating current charging and discharging; the alternating current relay unit is used for being opened during direct current charging and discharging and closed during alternating current charging and discharging; the alternating current-direct current power supply selection circuit is used for controlling the coil of the alternating current relay unit to lose electricity when the direct current is charged and discharged, and controlling the coil of the alternating current relay unit to obtain electricity when the alternating current is charged and discharged. The system can effectively solve the problem of AC/DC charging and power distribution compatibility, and has low cost.

Description

Charging and discharging system, vehicle and alternating current/direct current power supply selection circuit
Technical Field
The invention relates to the technical field of vehicles, in particular to a charging and discharging system, a vehicle and an alternating current/direct current power supply selection circuit.
Background
In the related art, inconvenient charging and long charging time are all the time problems to be solved in the popularization process of the new energy automobile. The dual-mode automobile is powered by oil and electricity, a part of the dual-mode automobile is sourced from a battery, a part of the dual-mode automobile is sourced from fuel, and the charging requirement is relatively lower than that of a pure electric automobile, so that most dual-mode automobiles are in standard alternating-current mode, and an alternating-current charging mode is shown in fig. 1, namely, the dual-mode automobile is connected with alternating-current power supply equipment for charging. However, with the popularization of new energy automobiles, people have a higher attention to the new energy automobiles, and have a stronger sound for charging convenience and charging speed: convenient and fast charging is required.
The alternating current charging mode is to connect commercial power to a vehicle-mounted charger, the vehicle-mounted charger converts alternating current commercial power into direct current required by a battery pack to charge the battery pack, charging power is limited by the power of the vehicle-mounted charger to a great extent, meanwhile, direct current charging equipment of public charging facilities on the market is more and more, charging equipment of expressway service areas is mainly charged by direct current, the alternating current charging equipment is relatively fewer in operation stations, and aiming at the current situation of an alternating current charging market, the charging speed is conveniently increased and accelerated by adopting a mode of newly increasing direct current charging on a dual-mode automobile, and the newly increased direct current charging mode is required to be compatible with the alternating current charging mode of the dual-mode automobile to a certain extent.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a charging and discharging system, which can effectively solve the problem of ac/dc charging and power distribution compatibility, and has low cost.
Another object of the present invention is to provide a vehicle.
The third objective of the present invention is to provide an ac/dc power supply selection circuit.
In order to solve the above-mentioned problems, a charge and discharge system according to an embodiment of a first aspect of the present invention includes:
A power distribution module, the power distribution module comprising:
the first end of the direct current relay unit is connected with the first charging and discharging power supply end, the second end of the direct current relay unit is connected with the second charging and discharging power supply end, the third end of the direct current relay unit is connected with the anode of the battery pack, and the fourth end of the direct current relay unit is connected with the cathode of the battery pack and is used for being closed during direct current charging and discharging and disconnected during alternating current charging and discharging;
the first end of the alternating current relay unit is connected with the first charging and discharging power supply end, and the second end of the alternating current relay unit is connected with the second charging and discharging power supply end for direct current charging and discharging
Opening at the time of alternating current charge and discharge, and closing at the time of alternating current charge and discharge;
the first end of the vehicle-mounted charging and discharging device is connected with the third end of the alternating current relay unit, the second end of the vehicle-mounted charging and discharging device is connected with the fourth end of the alternating current relay unit, the third end of the vehicle-mounted charging and discharging device is connected with the positive electrode of the battery pack, and the fourth end of the vehicle-mounted charging and discharging device is connected with the negative electrode of the battery pack; the first end of the AC/DC power supply selection circuit is connected with the first charge/discharge power supply end, the second end of the AC/DC power supply selection circuit is respectively connected with the second end of the AC relay unit and the second charge/discharge power supply end, the third end of the AC/DC power supply selection circuit is respectively connected with the fourth end of the AC relay unit and the second end of the vehicle-mounted charge/discharge device, the first control end of the AC/DC power supply selection circuit is connected with the first end of the coil of the AC relay unit and a preset DC source, and the second control end of the AC/DC power supply selection circuit is connected with the second end of the coil of the AC relay unit and is used for controlling the coil of the AC relay unit to lose electricity during DC charge/discharge and controlling the coil of the AC relay unit to obtain electricity during AC charge/discharge.
According to the charging and discharging system provided by the embodiment of the invention, based on the direct current relay unit and the alternating current relay unit which are arranged by the power distribution module, the alternating current charging port and the alternating current charging port are designed to be multiplexed on the basis of not changing the alternating current charging and discharging core component, namely, the alternating current relay unit is controlled to be disconnected, so that the direct current relay unit is closed to allow direct current to pass, the direct current charging and discharging process is realized, the alternating current relay unit is controlled to be powered on by the alternating current direct current power supply selection circuit when the alternating current charging and discharging is carried out, namely, the alternating current relay unit is controlled to be disconnected, the alternating current charging and discharging process is allowed to pass, namely, the charging and discharging system provided by the embodiment of the invention is designed to prevent the change of corresponding parts, reduce the cost of a new direct current charging function, and realize the compatibility of the alternating current charging and discharging of the alternating current power supply according to the direct current charging and discharging control of the alternating current relay unit by the alternating current power supply selection circuit by utilizing the negative half-cycle voltage characteristic of the alternating current power supply.
In some embodiments, the ac/dc power supply selection circuit includes: the positive electrode of the first diode unit is a second end of the alternating current/direct current power supply selection circuit, and the positive electrode of the first diode unit is respectively connected with the second end of the alternating current relay unit and the second charging/discharging power supply end; the positive electrode of the second diode unit is a third end of the alternating current/direct current power supply selection circuit, and the positive electrode of the second diode unit is respectively connected with the fourth end of the alternating current relay unit and the second end of the vehicle-mounted charging and discharging device; the primary side first end of the optocoupler unit is connected with the negative electrode of the first diode unit and the negative electrode of the second diode unit respectively, the primary side second end of the optocoupler unit is the first end of the alternating current/direct current power supply selection circuit, the primary side second end of the optocoupler unit is connected with the first charge/discharge power supply end, the secondary side first end of the optocoupler unit is the first control end of the alternating current/direct current power supply selection circuit, and the secondary side first end of the optocoupler unit is connected with the first end of the coil of the alternating current relay unit and the preset direct current source; the control end of the switching tube unit is connected with the second end of the secondary side of the optocoupler unit, the first end of the switching tube unit is the second control end of the alternating current/direct current power supply selection circuit, the first end of the switching tube unit is connected with the second end of the coil of the alternating current relay unit, and the second end of the switching tube unit is grounded.
An embodiment of a second aspect of the present invention provides a vehicle including: a battery pack; the charge-discharge system of the above embodiment, the charge-discharge system being connected with the battery pack; the vehicle-mounted charging socket is connected with the charging and discharging system and used for being connected with charging and discharging equipment in a matching mode so as to transmit charging and discharging power supply signals.
According to the vehicle provided by the embodiment of the invention, based on the matching connection of the vehicle-mounted charging socket and the charging and discharging equipment, by adopting the charging and discharging system provided by the embodiment of the invention, an alternating current power supply and a direct current power supply can be identified according to the charging and discharging power supply input by the charging and discharging equipment, and a corresponding power supply loop is automatically selected, so that the problem of compatibility of alternating current and direct current charging and discharging is effectively solved, the change of corresponding parts can be avoided, and the cost is low.
In some embodiments, the in-vehicle charging receptacle is an in-vehicle ac charging receptacle that includes a first ac-to-dc terminal and a neutral terminal; during charging and discharging, the first alternating current terminal is a first charging and discharging power supply end, and the neutral line terminal is a second charging and discharging power supply end.
In some embodiments, the vehicle-mounted charging socket is a vehicle-mounted direct current charging socket, the vehicle-mounted direct current charging socket comprising a positive power supply terminal and a negative power supply terminal; during charging and discharging, the positive terminal of the power supply is a first charging and discharging power supply end, and the negative terminal of the power supply is a second charging and discharging power supply end.
An embodiment of a third aspect of the present invention provides an ac/dc power supply selection circuit, including: the positive electrode of the first diode unit is connected with the second end of the alternating current relay unit of the vehicle and the second charging and discharging power supply end; the positive electrode of the second diode unit is connected with the fourth end of the alternating current relay unit and the vehicle-mounted charging and discharging device; the primary side first end of the optocoupler unit is connected with the negative electrode of the first diode unit and the negative electrode of the second diode unit respectively, the primary side second end of the optocoupler unit is the first end of the alternating current/direct current power supply selection circuit, the primary side second end of the optocoupler unit is connected with the first charge/discharge power supply end, the secondary side first end of the optocoupler unit is the first control end of the alternating current/direct current power supply selection circuit, and the secondary side first end of the optocoupler unit is connected with the first end of the coil of the alternating current relay unit and the preset direct current source; the control end of the switching tube unit is connected with the second end of the secondary side of the optocoupler unit, the first end of the switching tube unit is the second control end of the alternating current/direct current power supply selection circuit, the first end of the switching tube unit is connected with the second end of the coil of the alternating current relay unit, and the second end of the switching tube unit is grounded.
According to the alternating current-direct current power supply selection circuit provided by the embodiment of the invention, the first control end of the alternating current-direct current power supply selection circuit is connected with the first end of the coil of the alternating current relay unit, the second control end of the alternating current-direct current power supply selection circuit is connected with the second end of the coil of the alternating current relay unit, the voltage characteristic of the negative half cycle of the alternating current power supply is utilized, the coil of the alternating current relay unit is controlled to lose electricity during direct current charging and discharging, and the coil of the alternating current relay unit is controlled to obtain electricity during alternating current charging and discharging, namely automatic identification of the alternating current power supply and the direct current power supply is realized, so that the problem of compatibility of alternating current charging and discharging and power distribution is effectively solved, and the safety of alternating current and direct current sharing of a vehicle charging and discharging system is ensured.
In some embodiments, the optocoupler unit comprises: a first resistor subunit, wherein a first end of the first resistor subunit is connected with the negative electrode of the first diode unit; the primary side first end of the optical coupler is connected with the second end of the first resistor subunit, the primary side second end of the optical coupler is connected with the first charge-discharge power supply end, and the secondary side second end of the optical coupler is connected with the control end of the switching tube unit; the first end of the second resistor subunit is connected with the first end of the secondary side of the optocoupler, and the second end of the second resistor subunit is respectively connected with the first end of the coil of the alternating current relay unit and the preset direct current source.
In some embodiments, the switching tube unit includes: the first end of the third resistor subunit is connected with the second end of the secondary side of the optocoupler; the control end of the switching tube is connected with the second end of the third resistor subunit, the first end of the switching tube is connected with the second end of the coil of the alternating current relay unit, and the third end of the switching tube is grounded; and the first end of the fourth resistor subunit is respectively connected with the second end of the third resistor subunit and the control end of the switch tube, and the second end of the fourth resistor subunit is grounded.
In some embodiments, the switching tube unit further comprises: the first end of the voltage stabilizing unit is respectively connected with the second end of the secondary side of the optocoupler and the first end of the third resistor subunit, and the second end of the voltage stabilizing unit is grounded and used for maintaining continuous conduction of the switching tube when the optocoupler is turned off during alternating current charging and discharging.
In some embodiments, the voltage stabilizing unit includes a charge-discharge capacitor, and when the optocoupler is turned off during ac charging and discharging, the charge-discharge capacitor discharges to maintain the switching tube continuously turned on.
In some embodiments, the ac/dc power supply selection circuit further comprises: and the first end of the third diode unit is respectively connected with the first end of the coil of the alternating current relay unit and the preset direct current source, and the second end of the third diode unit is respectively connected with the second end of the coil of the alternating current relay unit and the first end of the switching tube unit.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a prior art vehicle AC charging mode;
fig. 2 is a schematic diagram of a dc multiplexed ac charging port according to one embodiment of the invention;
FIG. 3 is a schematic circuit diagram of a charge-discharge system according to one embodiment of the invention;
FIG. 4 is a block diagram of an AC/DC power supply selection circuit according to one embodiment of the invention;
fig. 5 is a waveform diagram of a driving voltage of a switching tube when an ac power supply is powered up and down according to an embodiment of the present invention.
Reference numerals:
a vehicle 100;
a charging system 10; a battery pack 1; a power distribution module 2; a vehicle-mounted charge/discharge device 3; an ac/dc power supply selection circuit 4;
a vehicle-mounted charging socket 5; a dc relay unit 21;
a first diode unit 41; a second diode unit 42; an optocoupler unit 43; a switching tube unit 44; and a voltage stabilizing unit 45.
Detailed Description
Embodiments of the present invention will be described in detail below, by way of example with reference to the accompanying drawings.
In order to solve the above-mentioned problems, the charge-discharge system according to the first aspect of the present invention is described below with reference to fig. 2 to 3, which can effectively solve the ac/dc charging and distribution compatibility problem and is low in cost.
In the embodiment, the basic concept of the embodiment of the invention is that based on the standard alternating-current charging mode of the vehicle, as shown in fig. 2, on the basis of being compatible with the alternating-current charging mode and not changing the vehicle-mounted charging and discharging device of the alternating-current charging core component, the embodiment of the invention designs the multiplexing of the direct-current charging port and the alternating-current charging port, namely realizes the direct-current charging and the alternating-current charging through the same charging port of the vehicle-mounted charging socket, thereby achieving the purposes of improving the charging performance and reducing the cost.
An embodiment of the present invention provides a vehicle, as shown in fig. 3, a vehicle 100 of an embodiment of the present invention includes a battery pack 1, an in-vehicle charging receptacle 5, and a charging and discharging system 10.
Wherein the charge and discharge system 10 is connected with the battery pack 1; the vehicle-mounted charging socket 5 is connected with the charging and discharging system 10 and is used for being connected with charging and discharging equipment in a matching way so as to transmit charging and discharging power supply signals.
As shown in fig. 3, the charge-discharge system 10 according to the embodiment of the present invention includes a power distribution module 2, a vehicle-mounted charge-discharge device 3, and an ac/dc power supply selection circuit 4.
In an embodiment, as shown in fig. 3, the power distribution module 2 includes a dc relay unit 21 and an ac relay unit K3. The first end of the dc relay unit 21 is connected to the first charge-discharge power end, the second end of the dc relay unit 21 is connected to the second charge-discharge power end, the third end of the dc relay unit 21 is connected to the positive electrode of the battery pack 1, and the fourth end of the dc relay unit 21 is connected to the negative electrode of the battery pack 1, and is used for being closed during dc charge and discharging and being opened during ac charge and discharging. And the first end of the alternating current relay unit K3 is connected with the first charging and discharging power supply end, the second end of the alternating current relay unit K3 is connected with the second charging and discharging power supply end and is used for being opened during direct current charging and discharging and closed during alternating current charging and discharging.
And the first end of the vehicle-mounted charging and discharging device 3 is connected with the third end of the alternating current relay unit K3, the second end of the vehicle-mounted charging and discharging device 3 is connected with the fourth end of the alternating current relay unit K3, the third end of the vehicle-mounted charging and discharging device 3 is connected with the positive electrode of the battery pack 1, and the fourth end of the vehicle-mounted charging and discharging device 3 is connected with the negative electrode of the battery pack 1. When the battery pack is charged, the vehicle-mounted charging and discharging device 3, such as a vehicle-mounted charger, is used for converting an input alternating current power supply into a direct current signal required by the battery pack; at the time of discharging, the vehicle-mounted charging and discharging device 3 is used for converting the direct current of the battery pack into alternating current to be supplied to alternating current electric equipment.
And the first end of the alternating current/direct current power supply selection circuit 4 is connected with the first charge/discharge power supply end, the second end of the alternating current/direct current power supply selection circuit 4 is respectively connected with the second end of the alternating current relay unit K3 and the second charge/discharge power supply end, the third end of the alternating current/direct current power supply selection circuit 4 is respectively connected with the fourth end of the alternating current relay unit K3 and the second end of the vehicle-mounted charge/discharge device 3, the first control end of the alternating current/direct current power supply selection circuit 4 is connected with the first end of the coil of the alternating current relay unit K3 and the preset direct current source U, and the second control end of the alternating current/direct current power supply selection circuit 4 is connected with the second end of the coil of the alternating current relay unit K3 and is used for controlling the power loss of the coil of the alternating current relay unit K3 during direct current charge/discharge and control of the coil of the alternating current relay unit K3 during alternating current charge/discharge.
In the embodiment, the power distribution module 2 is connected with a charging and discharging power supply through the vehicle-mounted charging socket 5 to transmit a power signal to the battery pack 1, so as to achieve the purpose of charging and discharging the battery pack 1. Specifically, as shown in fig. 3, the dc relay unit 21 is a dc charge/discharge control switch controlled by a battery management system of the vehicle, and is used for being closed during dc charge/discharge, and opened during ac charge/discharge, and the ac relay unit K3 is an ac charge/discharge control switch controlled by the ac/dc power supply selection circuit 4, and is used for being opened during dc charge/discharge, and closed during ac charge/discharge, so that the functions of ac charge/discharge and dc charge/discharge of the vehicle are realized by controlling the on/off of the dc relay unit 21 and the ac relay unit K3.
In the embodiment, the vehicle-mounted charging and discharging device does not reserve an external relay control interface, and considers the situation that the vehicle recognizes a direct current or alternating current charging and discharging mode, the embodiment of the invention utilizes the voltage characteristic of the negative half cycle of the alternating current power supply, and the alternating current/direct current power supply selection circuit 4 is arranged to automatically recognize the alternating current power supply or the direct current power supply according to the input charging and discharging power supply so as to control the on-off of the alternating current relay unit K3, thereby achieving the purpose of alternating current charging and discharging or direct current charging and discharging, effectively solving the problem of compatibility of alternating current charging and direct current charging and discharging, and ensuring the safety of alternating current and direct current sharing of a vehicle charging and discharging system.
For example, based on the connection between the first end of the ac/DC power supply selection circuit 4 and the first charge/discharge power supply end, the connection between the second end of the ac/DC power supply selection circuit 4 and the second end of the ac/DC relay unit K3, the connection between the third end of the ac/DC power supply selection circuit 4 and the fourth end of the ac/DC relay unit K3, and the connection between the second end of the vehicle-mounted charge/discharge device 3, as shown in fig. 3, the first charge/discharge power supply end is the positive pole dc+ of the DC charge power supply, the second charge/discharge power supply end is the negative pole DC-of the DC charge power supply, and the DC power supply is connected to the vehicle-mounted charging socket 5, at this time, the ac/DC power supply selection circuit 4 is in a cut-off state, so that the coil of the ac/DC relay unit K3 cannot be powered, the ac relay unit K3 is in an off state, the DC relay unit 21 is controlled to be closed by the battery management system of the vehicle, so that the DC power supply is input into the battery pack 1, the DC charge process is realized, and at the same time, the DC high voltage up to 750V cannot be connected to the ac charge circuit, so that the vehicle-mounted charge device 3 is not disturbed by the external high voltage. And when in alternating current charging, the first charging and discharging power supply end is the L phase of the alternating current charging power supply, the second charging and discharging power supply end is the N phase of the alternating current charging power supply, the alternating current power supply is connected into the vehicle-mounted charging socket 5, and at the moment, the alternating current/direct current power supply selection circuit 4 is in a conducting state because the negative half cycle N of the alternating current power supply keeps high voltage relative to the L phase, so that the coil of the alternating current relay unit K3 is electrified, the alternating current relay unit K3 is controlled to be closed, the alternating current power supply is input into the vehicle, and is converted into direct current signals required by the battery pack 1 through the vehicle-mounted charging and discharging device 3 so as to be charged into the battery pack 1, the alternating current charging process is realized, and the aim of compatibility of alternating current/direct current charging modes is fulfilled.
It should be noted that, the above is only an example of the ac/dc charging process performed by the charging/discharging system 10, and when the charging/discharging system is in a discharging state, the ac/dc power supply selection circuit 4 controls the ac relay unit K3 to be normally closed, so as to realize the ac discharging function as long as the ac power supply exists on the L phase/N phase. The charge and discharge system 10 according to the embodiment of the present invention is not limited to the dc charging port multiplexing ac charging port, but is also applicable to the ac charging port multiplexing dc charging port.
According to the charge-discharge system 10 of the embodiment of the present invention, based on the dc relay unit 21 and the ac relay unit K3 provided by the power distribution module 2, the ac-dc power supply selection circuit 4 controls the coil of the ac relay unit K3 to lose electricity when the dc charge and discharge is performed, that is, controls the ac relay unit K3 to be turned off, the dc relay unit 21 is automatically turned on, allowing the dc to pass through, the dc charge-discharge process is achieved, and the ac relay unit K3 is controlled to be powered on by the ac-dc power supply selection circuit 4 when the ac charge and discharge is performed, that is, the ac relay unit 21 is kept turned off, and the ac charge-discharge process is achieved.
In some embodiments, as shown in fig. 3 or 4, the ac/dc power supply selection circuit 4 according to the embodiment of the present invention includes a first diode unit 41, a second diode unit 42, an optocoupler unit 43, and a switching tube unit 44.
Specifically, as shown in fig. 3, the first diode unit 41 is D1, the positive electrode of the first diode unit D1 is the second end of the ac/dc power supply selection circuit 4, and the positive electrode of the first diode unit D1 is connected to the second end of the ac relay unit K3 and the second charging/discharging power supply end respectively. And the second diode unit 42 is D2, the positive electrode of the second diode unit D2 is the third end of the ac/dc power supply selection circuit 4, and the positive electrode of the second diode unit D2 is connected to the fourth end of the ac relay unit K3 and the second end of the vehicle-mounted charging/discharging device 3 respectively. And, the first end of the primary side of the optocoupler unit 43 is connected with the cathode of the first diode unit D1 and the cathode of the second diode unit D2, respectively, the second end of the primary side of the optocoupler unit 43 is the first end of the ac/dc power supply selection circuit 4, the second end of the primary side of the optocoupler unit 43 is connected with the first charge/discharge power supply end, the first end of the secondary side of the optocoupler unit 43 is the first control end of the ac/dc power supply selection circuit 4, and the first end of the secondary side of the optocoupler unit 43 is connected with the first end of the coil of the ac relay unit K3 and the preset dc source U. And, the control end of the switching tube unit 44 is connected to the second end of the secondary side of the optocoupler unit 43, the first end of the switching tube unit 44 is the second control end of the ac/dc power supply selection circuit 4, the first end of the switching tube unit 44 is connected to the second end of the coil of the ac relay unit K3, and the second end of the switching tube unit 44 is grounded.
The charge and discharge process will be described based on the structure of the ac/DC power supply selection circuit 4 in the above embodiment, in which the L-phase and DC power supply dc+ are multiplexed, the N-phase and DC power supply DC-are multiplexed, as shown in fig. 3, when the DC power supply is connected to the vehicle-mounted charging socket 5, the anodes of the optocoupler unit 43, the first diode unit D1 and the second diode unit D2 intercept the negative bus DC-, the optocoupler unit 43, the first diode unit D1 and the second diode unit D2 of the input DC power supply are in an off state, the ac/DC power supply selection circuit 4 is in an off state, the coil of the ac relay unit K3 cannot be powered, the ac relay unit K3 is in an off state, the DC relay unit 21 is automatically closed, and the DC power supply is connected to the DC charge and discharge circuit. And, during ac charging, at this time, because the characteristic that the negative half cycle N of the ac power source keeps high voltage with respect to the L phase is maintained, when the N phase is at positive voltage with respect to the L phase, the positive electrode of the light emitting diode on the primary side of the optocoupler unit 43 and the positive electrode of the first diode D1 are at positive voltage with respect to the negative electrode, the light emitting diode emits light and makes the secondary side conductive, that is, the optocoupler unit 43 conductive, the switching tube unit 44 conductive, the coil of the ac relay unit K3 is powered on, the ac relay unit K3 is closed, and the dc relay unit 21 is kept open, so as to realize that the ac power source is connected to the ac charging/discharging circuit. And when the vehicle is in AC discharge, the anode of the second diode unit D2 is conducted when being connected with positive voltage, the AC/DC power supply selection circuit 4 can automatically select an AC charge/discharge loop to work, and the AC relay unit K3 can be continuously closed to ensure the AC discharge function.
Therefore, based on multiplexing of the ac charging port and the dc charging port, the charging/discharging system 10 according to the embodiment of the present invention can control the ac relay unit K3 through the ac/dc power supply selection circuit 4 according to the input charging/discharging power supply, and no special components are required to be provided to control the dc relay unit 21 and the ac relay unit K3 respectively, and no related design of the vehicle-mounted charger is required to be changed, so that the cost is reduced, and the ac/dc power supply selection circuit 4 automatically controls the on/off of the ac relay unit K3 according to the input charging/discharging power supply, so that the ac loop is controlled to be turned off, the dc loop is controlled to be turned on, and the ac loop is controlled to be turned on to normally supply power during ac input, thereby effectively solving the problem of ac/dc charging/power distribution compatibility.
According to the vehicle 100 of the embodiment of the invention, based on the matching connection of the vehicle-mounted charging socket 5 and the charging and discharging equipment, by adopting the charging and discharging system 10 provided by the embodiment of the invention, an alternating current power supply and a direct current power supply can be identified according to the charging and discharging power supply input by the charging and discharging equipment, and a corresponding power supply loop can be automatically selected, so that the problem of compatibility of alternating current charging, discharging and power distribution is effectively solved, the change of corresponding parts can be avoided, and the cost is low.
In some embodiments, the vehicle-mounted charging socket 5 is a vehicle-mounted ac charging socket, and the vehicle-mounted ac charging socket includes a first ac-to-dc terminal L and a neutral terminal N, where the first ac-to-dc terminal L is a first charge-discharge power supply terminal and the neutral terminal N is a second charge-discharge power supply terminal during charging and discharging. That is, the vehicle-mounted alternating-current charging socket is an alternating-current charging port, so that the direct-current charging port can be reused for the alternating-current charging port during charging and discharging, and the purpose that the vehicle alternating-current charging and discharging mode is compatible with the direct-current charging and discharging mode is achieved.
In some embodiments, the vehicle-mounted charging socket 5 is a vehicle-mounted direct-current charging socket, and the vehicle-mounted direct-current charging socket includes a positive power terminal dc+ and a negative power terminal DC-, where the positive power terminal dc+ is a first charging and discharging power terminal and the negative power terminal DC-is a second charging and discharging power terminal during charging and discharging. That is, the vehicle-mounted direct current charging socket is a direct current charging port, so that the direct current charging port can be multiplexed by the alternating current charging port during charging and discharging, and the purpose that the vehicle direct current charging and discharging mode is compatible with the alternating current charging and discharging mode is achieved.
In the embodiment, the dc relay unit 21 is a dc charge-discharge control switch controlled by a battery management system of the vehicle for being closed at the time of dc charge-discharge and opened at the time of ac charge-discharge, and the ac relay unit K3 is an ac charge-discharge control switch including a switch and a coil, the energized state of which is controlled by the ac/dc power supply selection circuit 4 to thereby control the opening or closing of the K3 switch. As shown in fig. 4, the structure block diagram of the ac/dc power supply selection circuit provided by the embodiment of the invention realizes the functions of ac charging and discharging and dc charging and discharging of the vehicle by controlling the on-off of the ac relay unit K3. As shown in fig. 4, the ac/dc power supply selection circuit 4 according to the embodiment of the present invention includes a first diode unit 41, a second diode unit 42, an optocoupler unit 43, and a switching tube unit 44.
Specifically, as shown in fig. 3, the first diode unit 41 is D1, and the anode of the first diode unit D1 is connected to the second end of the ac relay unit K3 of the vehicle and the second charging/discharging power source end. And the second diode unit 42 is D2, and the anode of the second diode unit D2 is connected to the fourth terminal of the ac relay unit K3 and the vehicle-mounted charging and discharging device 3. And, the first end of the primary side of the optocoupler unit 43 is connected with the cathode of the first diode unit D1 and the cathode of the second diode unit D2, respectively, the second end of the primary side of the optocoupler unit 43 is the first end of the ac/dc power supply selection circuit 4, the second end of the primary side of the optocoupler unit 43 is connected with the first charge/discharge power supply end, the first end of the secondary side of the optocoupler unit 43 is the first control end of the ac/dc power supply selection circuit 4, and the first end of the secondary side of the optocoupler unit 43 is connected with the first end of the coil of the ac relay unit K3 and the preset dc source U. And, the control end of the switching tube unit 44 is connected to the second end of the secondary side of the optocoupler unit 43, the first end of the switching tube unit 44 is the second control end of the ac/dc power supply selection circuit 4, the first end of the switching tube unit 44 is connected to the second end of the coil of the ac relay unit K3, and the second end of the switching tube unit 44 is grounded. The first end of the secondary side of the optocoupler unit 43 is connected with a preset direct current source U, and the second end of the secondary side of the optocoupler unit 43 is connected with the switching tube unit 44, so that the switching tube unit 44 is powered by the preset direct current source U, and the driving voltage of the switching tube unit 44 is ensured to be stable when the alternating current is input.
In the embodiment of the invention, based on the connection of the primary side second end of the optocoupler unit 43 with the first charge-discharge power supply end, the connection of the positive electrode of the first diode unit D1 with the second end of the ac relay unit K3 and the second charge-discharge power supply end, and the connection of the positive electrode of the second diode unit D2 with the fourth end of the ac relay unit K3 and the second end of the vehicle-mounted charge-discharge device 3, the ac-dc power supply selection circuit 4 can automatically identify the ac power supply or the dc power supply according to the input charge-discharge power supply by utilizing the voltage characteristic of the negative half cycle of the ac power supply, that is, the coil of the ac relay unit K3 is controlled to lose electricity during the dc charge-discharge, and the coil of the ac relay unit K3 is controlled to realize the control of the ac relay unit K3, thereby achieving the purpose of ac charge-discharge or dc charge-discharge, and effectively solving the problem of ac-dc charge-dc power distribution compatibility, and ensuring the safety of the ac-dc sharing of the vehicle charge-discharge system.
That is, at the time of ac input, the ac/dc power supply selection circuit 4 operates, ensuring that the ac relay unit K3 is closed; at the time of direct current input, the alternating current-direct current power supply selection circuit 4 does not operate, and the alternating current relay unit K3 is turned off. And when the vehicle is in AC discharge, the anode of the second diode unit D2 is conducted when being connected with positive voltage, the AC/DC power supply selection circuit 4 works, and the AC relay unit K3 can be continuously closed to ensure the discharge function. For example, as shown in fig. 3, during DC charging, the positive electrode of the charging power supply is dc+, the negative electrode of the charging power supply is DC-, and the DC power supply is connected to the vehicle charging socket 5, at this time, the ac/DC power supply selection circuit 4 is in a cut-off state, so that the coil of the ac relay unit K3 cannot get electricity, and the ac relay unit K3 is ensured to be in an open state, and the DC relay unit 21 is controlled to be closed by the battery management system of the vehicle, so that the DC power supply is input into the battery pack 1, the DC charging process is realized, and meanwhile, the DC high voltage up to 750V cannot be connected to the ac charging circuit, so as to ensure that the vehicle charging and discharging device 3 is not interfered by external high voltage. And when in alternating current charging, the positive electrode of the charging power supply is L-phase, the negative electrode of the charging power supply is N-phase, and the alternating current power supply is connected into the vehicle-mounted charging socket 5, at the moment, the alternating current/direct current power supply selection circuit is in a conducting state due to the characteristic that the negative half cycle N of the alternating current power supply keeps high voltage relative to the L-phase, so that the coil of the alternating current relay unit K3 is electrified, the alternating current relay unit K3 is controlled to be closed, the alternating current power supply is input into the battery pack 1, the alternating current charging process is realized, and the aim of compatibility of alternating current/direct current charging modes is fulfilled.
It should be noted that, the above is only an example of the ac/dc charging process performed by the charging/discharging system 10, and when the charging/discharging system is in a discharging state, the ac/dc power supply selection circuit 4 controls the ac relay unit K3 to be normally closed, so as to realize the ac discharging function as long as the ac power supply exists on the L phase/N phase. The charge and discharge system 10 according to the embodiment of the present invention is not limited to the dc charging port multiplexing ac charging port, but is also applicable to the ac charging port multiplexing dc charging port.
According to the AC/DC power supply selection circuit 4 provided by the embodiment of the invention, the first control end of the AC/DC power supply selection circuit 4 is connected with the first end of the coil of the AC/DC relay unit K3, and the second control end of the AC/DC power supply selection circuit 4 is connected with the second end of the coil of the AC/DC relay unit K3, so that the AC/DC power supply is controlled to be powered off when the AC/DC power supply is charged and discharged by utilizing the voltage characteristic of the negative half cycle of the AC/DC power supply, and the coil of the AC/DC relay unit K3 is controlled to be powered on when the AC/DC power supply is charged and discharged, namely the automatic identification of the AC/DC power supply is realized, thereby effectively solving the problem of the compatibility of AC/DC charging and discharging power distribution and ensuring the safety of AC/DC sharing of a vehicle charging and discharging system.
In some embodiments, as shown in fig. 3, the optocoupler unit 43 of the embodiment of the invention includes a first resistor subunit R1, an optocoupler OP1, and a second resistor subunit R2. Wherein, the first end of the first resistor subunit R1 is connected with the cathode of the first diode unit D1; the first end of the primary side of the optical coupler OP1 is connected with the second end of the first resistor subunit R1, the second end of the primary side of the optical coupler OP1 is connected with the first charge-discharge power supply end, and the second end of the secondary side of the optical coupler OP1 is connected with the control end of the switching tube unit 44; the first end of the second resistor subunit R2 is connected with the first end of the secondary side of the optocoupler OP1, and the second end of the second resistor subunit R2 is respectively connected with the first end of the coil of the ac relay unit K3 and the preset dc source U.
In the embodiment, since the specification PC817 specifies that the transmission ratio CRT e (50%, 600%), the current transmission ratio of the optocoupler OP1 is 50% +.crt=ic/If 100% +.600%, where Ic is the on current of the secondary transistor of the optocoupler, if is the driving current of the primary diode of the optocoupler, when the secondary Ic of the optocoupler OP1 is less than or equal to 6If, reliable conduction of the optocoupler can be ensured, and when the design of the embodiment of the invention is to reduce the power consumption in the circuit while considering under-voltage (primary under-voltage ensures the weakest driving current of the primary), the primary resistor, i.e. the first resistor subunit R1, can take 400kΩ, at this time if=85V/400 kΩ ≡ 0.2mA, ic < 1.2mA, and the optocoupler is reliably conducted. The optocoupler current transmission ratio CRT is the ratio of the secondary side to the primary side of the optocoupler, crt=ic/If, 100%.
In addition, the embodiment of the invention is designed to consider the driving requirement of the saturated conduction of the optocoupler during overvoltage (the secondary side overvoltage considers the condition that the weakest primary side driving current can drive the secondary side maximum current, and ensures the reliable conduction of the optocoupler), ic=16V/R is less than 1.2mA, namely R is more than 13kΩ, so that when the conventional design of the primary side of the optocoupler OP1 can normally drive the secondary side of the optocoupler to conduct, the secondary side second resistor subunit R2 of the optocoupler OP1 can select 400kΩ.
In some embodiments, as shown in fig. 3, the switching tube unit 44 of the embodiment of the present invention includes a third resistor subunit R3, a switching tube Q1, and a fourth resistor subunit R4. The first end of the third resistor subunit R3 is connected with the second end of the secondary side of the optical coupler OP 1; the control end of the switching tube Q1 is connected with the second end of the third resistor subunit R3, the first end of the switching tube Q1 is connected with the second end of the coil of the alternating current relay unit K3, and the third end of the switching tube Q1 is grounded; the first end of the fourth resistor subunit R4 is connected to the second end of the third resistor subunit R3 and the control end of the switching tube Q1, respectively, and the second end of the fourth resistor subunit R4 is grounded.
In some embodiments, as shown in fig. 3, the switching tube unit 44 of the embodiment of the present invention further includes a voltage stabilizing unit 45, where a first end of the voltage stabilizing unit 45 is connected to a second end of the secondary side of the optocoupler OP1 and a first end of the third resistor subunit R3, respectively, and a second end of the voltage stabilizing unit 45 is grounded, so as to maintain the switching tube Q1 continuously turned on when the ac charge-discharge optocoupler OP1 is turned off.
In the embodiment, when the alternating current is charged, the alternating current voltage is 110V@60Hz or 220V@50Hz, in one alternating current period, when the L phase is in positive voltage compared with the N phase, the L phase is consistent with direct current charging, the optocoupler OP1 is turned off, the switching tube Q1 is turned off, the coil of the alternating current relay unit K3 cannot be powered on, and the alternating current relay unit K3 is in an off state; when the N phase is at positive voltage compared with the L phase, the anodes of the optocoupler OP1 and the first diode unit D1 are connected with positive voltage, the optocoupler OP1 is conducted, the switching tube Q1 is conducted, the coil of the alternating current relay unit K3 is electrified, and the alternating current relay unit K3 is closed. Wherein, one period of the alternating current is t=1/f=20ms, when the L phase is positive voltage, the L phase occupies 10ms, when the N phase is positive voltage, when the N phase is positive voltage, the anodes of the optocoupler OP1, the first diode D1 and the second diode D2 are connected with positive voltage, and the optocoupler OP1 can be conducted for 10ms; when the L phase is positive voltage compared with the N phase, the optical coupler OP1 is turned off. Therefore, in order to ensure that the coil of the alternating current relay unit K3 is continuously electrified and the switching tube Q1 is continuously conducted when alternating current is supplied, the voltage stabilizing unit 45 is designed on the secondary side of the optocoupler OP1, so that the level of the driving switching tube Q1 is kept to be high within 10ms of the turn-off of the optocoupler OP1, the conduction of the switching tube Q1 is ensured, the coil of the alternating current relay unit K3 is continuously electrified, and the continuous closing of the alternating current relay unit K3 is realized.
In the embodiment, in order to ensure that the driving voltage of the switching tube Q1 remains stable, no matter the optocoupler OP1 is turned on or off, it is required to ensure that the driving voltage of the switching tube Q1, that is, the voltage division U > Uth of the fourth resistor subunit R4, is the turn-on threshold voltage of the switching tube Q1, so as to ensure that the driving voltage of the switching tube Q1 is continuous when the ac power is input, so that the switching tube Q1 is still continuously turned on when the ac power is turned over, that is, within 10ms when the optocoupler OP1 is turned off.
In some embodiments, as shown in fig. 3, the voltage stabilizing unit 45 of the embodiment of the present invention includes a charge-discharge capacitor C1, and when the ac charge-discharge optocoupler OP1 is turned off, the charge-discharge capacitor C1 discharges to maintain the switching tube Q1 continuously turned on. That is, when the optocoupler OP1 is turned on, the charging time of the charge-discharge capacitor C1 is far less than 10ms, so as to ensure that the voltage on the charge-discharge capacitor C1 is rapidly full, so that when the optocoupler OP1 is turned off, the discharging time of the charge-discharge capacitor C1 is 10ms, and the voltage division U on the fourth resistor subunit R4 within 10ms is ensured to be greater than the threshold voltage of the switching tube Q1, so that the switching tube Q1 is continuously turned on.
In the embodiment, the voltage range e (9V, 16V) of the dc source is preset, and the initial discharge voltage U0 is 9V when it is minimum, where, in order to ensure that the driving voltage of the switching tube Q1 is stable, the voltage Ue on the fourth resistor subunit R4 is substantially equal to the dc source voltage, so the voltage Ue needs to be greater than Uth when the 10ms end discharge is finished, and normal operation of the switching tube Q1 can be ensured. For example, when discharging, since ue=u0 (1-e-t/RC 1), t=rc1×ln (U0/Ue) > 10ms, where Ue > 3V, ue=8v, u0=9v, and thus C1 > 0.2uF can be obtained, the voltage stabilizing requirement can be satisfied.
For example, the actual circuit is set to input alternating current e (85V, 275V) and the voltage e (9V, 16V) of the direct current power supply on the whole vehicle is preset, when the voltage is 9V at the lowest, the driving voltage waveform of the switching tube Q1 is as shown in fig. 5, the alternating current power supply is powered on at time t1 to input alternating current, the alternating current power supply is powered off at time t2, in this process, the driving voltage of the switching tube Q1 can be constantly output to 8.2V, and the requirement of reliable conducting voltage of the switching tube Q1 is met.
In an embodiment, the threshold voltage value Uth of the switching tube Q1 may be determined according to a specific situation, for example Uth may be 3V, which is not limited.
In some embodiments, as shown in fig. 3, the ac/dc power supply selection circuit 4 according to the embodiment of the present invention further includes a third diode unit D3, where a first end of the third diode unit D3 is connected to a first end of the coil of the ac relay unit K3 and a preset dc source U, respectively, and a second end of the third diode unit D3 is connected to a second end of the coil of the ac relay unit K3 and a first end of the switching tube unit Q1, respectively.
Therefore, according to the ac/dc power supply selection circuit 4 provided in the embodiment of the present invention, based on the fact that the positive electrode of the first diode unit D1 is connected to the second end of the ac relay unit K3 and the second charge/discharge power supply end, respectively, and the positive electrode of the second diode unit D2 is connected to the fourth end of the ac relay unit K3 and the second end of the vehicle-mounted charge/discharge device 3, respectively, when charging/discharging is performed, the ac relay unit K3 can be controlled to be closed when the ac power supply is identified, and when the dc power supply is identified, the ac/dc power supply selection circuit 4 does not operate, the ac relay unit K3 is automatically opened, so that the purpose of controlling the on/off of the ac relay unit K3 by the ac/dc power supply selection circuit 4 is achieved, the purpose of ac charging/discharging or dc charging/discharging is achieved, the problem of ac/dc charging/discharging compatibility is effectively solved, and the safety of ac/dc sharing of the vehicle charge/discharge system is ensured.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A charge-discharge system, comprising:
a power distribution module, the power distribution module comprising:
the first end of the direct current relay unit is connected with the first charging and discharging power supply end, the second end of the direct current relay unit is connected with the second charging and discharging power supply end, the third end of the direct current relay unit is connected with the anode of the battery pack, and the fourth end of the direct current relay unit is connected with the cathode of the battery pack and is used for being closed during direct current charging and discharging and disconnected during alternating current charging and discharging;
The first end of the alternating current relay unit is connected with the first charging and discharging power supply end, and the second end of the alternating current relay unit is connected with the second charging and discharging power supply end and is used for being disconnected during direct current charging and discharging and closed during alternating current charging and discharging;
the first end of the vehicle-mounted charging and discharging device is connected with the third end of the alternating current relay unit, the second end of the vehicle-mounted charging and discharging device is connected with the fourth end of the alternating current relay unit, the third end of the vehicle-mounted charging and discharging device is connected with the positive electrode of the battery pack, and the fourth end of the vehicle-mounted charging and discharging device is connected with the negative electrode of the battery pack;
the first end of the AC/DC power supply selection circuit is connected with the first charge/discharge power supply end, the second end of the AC/DC power supply selection circuit is respectively connected with the second end of the AC relay unit and the second charge/discharge power supply end, the third end of the AC/DC power supply selection circuit is respectively connected with the fourth end of the AC relay unit and the second end of the vehicle-mounted charge/discharge device, the first control end of the AC/DC power supply selection circuit is connected with the first end of the coil of the AC relay unit and a preset DC source, and the second control end of the AC/DC power supply selection circuit is connected with the second end of the coil of the AC relay unit and is used for controlling the coil of the AC relay unit to lose electricity during DC charge/discharge and controlling the coil of the AC relay unit to obtain electricity during AC charge/discharge.
2. The charge-discharge system according to claim 1, wherein the ac/dc power supply selection circuit includes:
the positive electrode of the first diode unit is a second end of the alternating current/direct current power supply selection circuit, and the positive electrode of the first diode unit is respectively connected with the second end of the alternating current relay unit and the second charging/discharging power supply end;
the positive electrode of the second diode unit is a third end of the alternating current/direct current power supply selection circuit, and the positive electrode of the second diode unit is respectively connected with the fourth end of the alternating current relay unit and the second end of the vehicle-mounted charging and discharging device;
the primary side first end of the optocoupler unit is connected with the negative electrode of the first diode unit and the negative electrode of the second diode unit respectively, the primary side second end of the optocoupler unit is the first end of the alternating current/direct current power supply selection circuit, the primary side second end of the optocoupler unit is connected with the second charging/discharging power supply end, the secondary side first end of the optocoupler unit is the first control end of the alternating current/direct current power supply selection circuit, and the secondary side first end of the optocoupler unit is connected with the first end of the coil of the alternating current relay unit and the preset direct current source;
The control end of the switching tube unit is connected with the second end of the secondary side of the optocoupler unit, the first end of the switching tube unit is the second control end of the alternating current/direct current power supply selection circuit, the first end of the switching tube unit is connected with the second end of the coil of the alternating current relay unit, and the second end of the switching tube unit is grounded.
3. A vehicle, characterized in that the vehicle comprises:
a battery pack;
the charge-discharge system of claim 1 or 2, connected to the battery pack;
the vehicle-mounted charging socket is connected with the charging and discharging system and used for being connected with charging and discharging equipment in a matching mode so as to transmit charging and discharging power supply signals.
4. A vehicle according to claim 3, wherein,
the vehicle-mounted charging socket is a vehicle-mounted alternating current charging socket and comprises a first alternating current terminal and a neutral line terminal;
during charging and discharging, the first alternating current terminal is a first charging and discharging power supply end, and the neutral line terminal is a second charging and discharging power supply end.
5. A vehicle according to claim 3, wherein,
the vehicle-mounted charging socket is a vehicle-mounted direct-current charging socket and comprises a power positive terminal and a power negative terminal;
During charging and discharging, the positive terminal of the power supply is a first charging and discharging power supply end, and the negative terminal of the power supply is a second charging and discharging power supply end.
6. An ac/dc power supply selection circuit, comprising:
the positive electrode of the first diode unit is connected with the second end of the alternating current relay unit of the vehicle and the second charging and discharging power supply end;
the positive electrode of the second diode unit is connected with the fourth end of the alternating current relay unit and the vehicle-mounted charging and discharging device;
the primary side first end of the optocoupler unit is connected with the negative electrode of the first diode unit and the negative electrode of the second diode unit respectively, the primary side second end of the optocoupler unit is the first end of the alternating current/direct current power supply selection circuit, the primary side second end of the optocoupler unit is connected with the first charging/discharging power supply end, the secondary side first end of the optocoupler unit is the first control end of the alternating current/direct current power supply selection circuit, and the secondary side first end of the optocoupler unit is connected with the first end of the coil of the alternating current relay unit and a preset direct current source;
the control end of the switching tube unit is connected with the second end of the secondary side of the optocoupler unit, the first end of the switching tube unit is the second control end of the alternating current/direct current power supply selection circuit, the first end of the switching tube unit is connected with the second end of the coil of the alternating current relay unit, and the second end of the switching tube unit is grounded.
7. An ac/dc power supply selection circuit according to claim 6, wherein the optocoupler unit comprises:
a first resistor subunit, wherein a first end of the first resistor subunit is connected with the negative electrode of the first diode unit;
the primary side first end of the optical coupler is connected with the second end of the first resistor subunit, the primary side second end of the optical coupler is connected with the first charge-discharge power supply end, and the secondary side second end of the optical coupler is connected with the control end of the switching tube unit;
the first end of the second resistor subunit is connected with the first end of the secondary side of the optocoupler, and the second end of the second resistor subunit is respectively connected with the first end of the coil of the alternating current relay unit and the preset direct current source.
8. An ac/dc power supply selection circuit according to claim 7, wherein the switching tube unit comprises:
the first end of the third resistor subunit is connected with the second end of the secondary side of the optocoupler;
the control end of the switching tube is connected with the second end of the third resistor subunit, the first end of the switching tube is connected with the second end of the coil of the alternating current relay unit, and the third end of the switching tube is grounded;
And the first end of the fourth resistor subunit is respectively connected with the second end of the third resistor subunit and the control end of the switch tube, and the second end of the fourth resistor subunit is grounded.
9. An ac/dc power supply selection circuit according to claim 8, wherein the switching tube unit further comprises:
the first end of the voltage stabilizing unit is respectively connected with the second end of the secondary side of the optocoupler and the first end of the third resistor subunit, and the second end of the voltage stabilizing unit is grounded and used for maintaining continuous conduction of the switching tube when the optocoupler is turned off during alternating current charging and discharging.
10. The ac/dc power supply selection circuit of claim 9, wherein the voltage stabilizing unit comprises a charge/discharge capacitor that discharges to maintain the switching tube continuously on when the optocoupler is turned off during ac charging/discharging.
11. An ac/dc power supply selection circuit according to any one of claims 6 to 10, further comprising:
and the first end of the third diode unit is respectively connected with the first end of the coil of the alternating current relay unit and the preset direct current source, and the second end of the third diode unit is respectively connected with the second end of the coil of the alternating current relay unit and the first end of the switching tube unit.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105790340A (en) * 2014-12-25 2016-07-20 惠州比亚迪电池有限公司 Vehicle charging system and vehicle
CN206908337U (en) * 2017-06-16 2018-01-19 武汉科华动力科技有限公司 A kind of AC/D.C. compatible on-board charging system
JP2020088873A (en) * 2018-11-14 2020-06-04 トヨタ自動車株式会社 vehicle
CN210792823U (en) * 2019-05-24 2020-06-19 比亚迪股份有限公司 Electric automobile charging system and electric automobile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105790340A (en) * 2014-12-25 2016-07-20 惠州比亚迪电池有限公司 Vehicle charging system and vehicle
CN206908337U (en) * 2017-06-16 2018-01-19 武汉科华动力科技有限公司 A kind of AC/D.C. compatible on-board charging system
JP2020088873A (en) * 2018-11-14 2020-06-04 トヨタ自動車株式会社 vehicle
CN210792823U (en) * 2019-05-24 2020-06-19 比亚迪股份有限公司 Electric automobile charging system and electric automobile

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