CN210792823U - Electric automobile charging system and electric automobile - Google Patents
Electric automobile charging system and electric automobile Download PDFInfo
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- CN210792823U CN210792823U CN201920767126.XU CN201920767126U CN210792823U CN 210792823 U CN210792823 U CN 210792823U CN 201920767126 U CN201920767126 U CN 201920767126U CN 210792823 U CN210792823 U CN 210792823U
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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
- 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
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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
- 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
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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
- Y02T90/12—Electric charging stations
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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
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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
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The utility model provides an electric automobile charging system and an electric automobile, the electric automobile charging system comprises a power battery, a direct current converter, a switch module, a charging port and a battery manager, when the charging port is connected with the external equipment, a first charging and discharging loop is formed among the power battery, the switch module, the charging port and the external equipment, a second charging and discharging loop is formed among the power battery, the direct current converter, the switch module, the charging port and the external equipment, due to the arrangement of the first charge-discharge loop and the second charge-discharge loop, the effect of gating the first charge-discharge loop or the second charge-discharge loop to carry out a high-power charge-discharge mode or a normal charge-discharge mode according to the electrical parameters of the external equipment and the electrical parameters of the power battery is achieved, and the problems that the type of the direct current converter is changed and the cost is increased due to the fact that the overcurrent capacity of elements inside the direct current converter is increased are solved.
Description
Technical Field
The utility model relates to an electric motor car technical field especially relates to an electric automobile charging system and electric automobile.
Background
In the prior art, when a charging machine of any specification is charged, a bidirectional DC-DC converter is required to be used for voltage conversion so as to transmit the energy of the charging machine to a power battery, and the DC-DC converter is limited by components such as internal inductance and the like, so that the overcurrent capacity of the DC-DC converter is limited, and high-power charging cannot be realized even if the DC charging machine with higher output voltage and current capacity is charged; if the method of improving the overcurrent capacity of the internal components of the DC-DC converter is adopted, the excessive waste of the cost can be caused.
Disclosure of Invention
An object of the utility model is to provide an electric automobile charging system and electric automobile to solve prior art and carry out voltage transformation through DC-DC converter and lead to can not realizing the problem that high-power charges when charging to electric automobile charging system.
The utility model discloses a realize like this, the utility model discloses a first aspect provides an electric automobile charging system, electric automobile charging system includes power battery, direct current converter, switch module and the mouth that charges that connects gradually, switch module still connects power battery, electric automobile charging system still includes the battery manager, the battery manager respectively with power battery, direct current converter, switch module and the mouth that charges connect;
when the charging port is connected with external equipment, a first charging and discharging loop is formed among the power battery, the switch module, the charging port and the external equipment, and a second charging and discharging loop is formed among the power battery, the direct current converter, the switch module, the charging port and the external equipment;
the battery manager obtains the electrical parameters of the external equipment and the electrical parameters of the power battery, and controls the switch module to enable the first charge-discharge loop or the second charge-discharge loop to be conducted according to the electrical parameters of the external equipment and the electrical parameters of the power battery.
Further, the battery manager compares the electrical parameter of the external device with the electrical parameter of the power battery, and controls the switch module to switch on the first charge-discharge loop or the second charge-discharge loop according to the comparison result.
Further, the external device comprises a direct current charger and a charging gun, the direct current charger is connected with the charging gun, the charging gun is connected with the charging port, and the direct current charger sends an electrical parameter representing the maximum output capacity of the direct current charger to the battery manager;
the electrical parameter of the maximum output capacity is the maximum output voltage, and the electrical parameter of the power battery is the highest charging voltage of the power battery;
and the battery manager controls the first charge-discharge loop or the second charge-discharge loop to be conducted according to a comparison result between the maximum output voltage of the direct current charger and the highest charging voltage of the power battery.
Further, the battery manager controls the first charge-discharge loop to be conducted when the difference value between the maximum output voltage of the direct current charger and the highest charging voltage of the power battery is larger than or equal to a preset value;
and the battery manager controls the second charge-discharge loop to be conducted when the difference value between the maximum output voltage of the direct current charger and the highest charging voltage of the power battery is smaller than a preset value.
Further, the switch module includes first end, second end, third end, fourth end, fifth end and sixth end, the positive terminal of the mouth that charges is connected respectively the first end and the second end of switch module, the third end of switch module is connected the negative pole end of the mouth that charges, the fourth end of switch module is connected the positive terminal of power battery, the fifth end of switch module is connected the first end of DC converter, the sixth end of switch module is connected the second end of DC converter with the negative pole end of power battery, the third end of DC converter is connected the positive terminal of power battery.
Further, the switch module includes a second switch and a third switch, a control end of the second switch and a control end of the third switch are both connected to the battery manager, a first end and a second end of the second switch are respectively a second end and a fifth end of the switch module, and a first end and a second end of the third switch are respectively a third end and a sixth end of the switch module.
Further, the power battery, the dc converter, the second switch, the positive terminal of the charging port, the external device, the negative terminal of the charging port, and the third switch form a second charge/discharge circuit.
Further, the switch module further includes a first switch, a control terminal of the first switch is connected to the battery manager, and a first terminal and a second terminal of the first switch are a first terminal and a fourth terminal of the switch module, respectively.
Further, the power battery, the first switch, the positive terminal of the charging port, the external device, the negative terminal of the charging port, and the third switch form a first charge-discharge loop.
The utility model discloses the second aspect provides an electric automobile, electric automobile includes foretell electric automobile charging system.
The utility model provides an electric automobile charging system and electric automobile, electric automobile charging system includes power battery, the direct current converter, switch module, mouth and battery manager charge, when the external equipment is connected to the mouth that charges, power battery, switch module, form first charge-discharge return circuit between mouth and the external equipment that charges, power battery, the direct current converter, switch module, form second charge-discharge return circuit between mouth and the external equipment that charges, because through switch module respectively with the external equipment, the mouth that charges, direct current converter and power battery form the setting of first charge-discharge return circuit and second charge-discharge return circuit, the effect that carries out high-power charge-discharge mode or normal charge-discharge mode according to the first charge-discharge return circuit of electric parameter gating of external equipment and power battery or second charge-discharge return circuit has been reached, overcome the model that changes the direct current converter and increased the overcurrent capacity of the inside component of direct current converter and lead to cost improvement To a problem of (a).
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an electric vehicle charging system according to an embodiment of the present invention;
fig. 2 is another schematic structural diagram of an electric vehicle charging system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electric vehicle according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating an operation of an electric vehicle charging system according to an embodiment of the present invention;
fig. 5 is a timing diagram illustrating a switching manner of a charging system of an electric vehicle according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
The embodiment of the utility model provides an electric automobile charging system 10, as shown in fig. 1, electric automobile charging system 10 includes power battery 104, direct current converter 103, switch module 102 and the mouth of charging 101 that connects gradually, and switch module 102 still connects power battery 104, and electric automobile charging system 10 still includes battery manager 105, and battery manager 105 is connected with power battery 104, direct current converter 103, switch module 102 and the mouth of charging 101 respectively;
when the charging port 101 is connected with the external device 20, a first charging and discharging loop is formed among the power battery 104, the switch module 102, the charging port 101 and the external device 20, and a second charging and discharging loop is formed among the power battery 104, the direct current converter 103, the switch module 102, the charging port 101 and the external device 20;
the battery manager 105 obtains the electrical parameters of the external device 20 and the electrical parameters of the power battery 104, and the electrical parameters of the external device 20 and the electrical parameters of the power battery 104 control the switch module 102 to conduct the first charge-discharge loop or the second charge-discharge loop.
The external device 20 may be a charging device, and when the charging device is connected to the charging port 101 of the electric vehicle charging system 10, the charging device charges the power battery 104 through the first charge-discharge loop or the second charge-discharge loop, and at this time, the first charge-discharge loop and the second charge-discharge loop are both charge loops; the external device 20 may also be an electric device, and when the electric device is connected to the charging port 101 of the electric vehicle charging system, the power battery 104 discharges the electric device through the first charge/discharge circuit or the second charge/discharge circuit, and at this time, the first charge/discharge circuit and the second charge/discharge circuit are both discharge circuits.
The first charge-discharge circuit and the second charge-discharge circuit are different in that a direct current converter 103 is arranged in the second charge-discharge circuit, the direct current converter 103 may be a bidirectional DC/DC converter, the bidirectional DC/DC converter may perform voltage conversion on voltage output by the charging equipment when the charging equipment charges the power battery 104, and the bidirectional DC/DC converter may also perform direct current conversion on voltage output by the power battery 104 when the power battery 104 discharges the electric equipment; the first charge-discharge loop is not provided with the direct current converter 103, when the first charge-discharge loop is conducted, the external device 20 is directly connected with the power battery 104, voltage conversion is not needed, the first charge-discharge loop can realize that the charging device directly charges the power battery 104 in a high-power mode, and can also realize that the power battery 104 discharges electric equipment in a high-power mode.
After the external device 20 is connected to the charging port 101, the external device 20 and the battery manager 105 communicate with each other, compare the electrical parameters of the external device 20 with the electrical parameters of the power battery 104, and control the switch module 102 to turn on the first charge-discharge loop or the second charge-discharge loop according to the comparison result; when the external device 20 is a charging device, the charging device sends an electrical parameter representing the charging capability to the battery manager 105, the battery manager 105 controls the first charging and discharging loop or the second charging and discharging loop to be conducted according to the output capability of the charging device and the voltage of the power battery 104, when the output capability of the charging device is strong, the first charging and discharging loop is controlled to be conducted, so that the charging device directly charges the power battery 104 with high power, and when the output capability of the charging device is weak, the second charging and discharging loop is controlled to be conducted, so that the direct current converter 103 converts the voltage output by the charging device and then charges the power battery 104; when the external device 20 is an electric device, the electric device sends the charging parameters to the battery manager 105, the battery manager 105 controls the first charging and discharging loop or the second charging and discharging loop to be conducted according to the charging parameters of the electric device and the voltage of the power battery 104, when the electric device needs high-power quick charging, the first charging and discharging loop is controlled to be conducted, the power battery 104 is directly connected with the electric device to conduct high-power charging, when the electric device needs normal charging, the second charging and discharging loop is controlled to be conducted, and the electric device is charged after the voltage output by the power battery 104 is converted by the direct current converter 103.
The embodiment of the present invention provides an electric vehicle charging system 10, which forms a first charging and discharging loop and a second charging and discharging loop with an external device 20, a charging port 101, a dc converter 103 and a power battery 104 through a switch module 102, the first charge-discharge loop or the second charge-discharge loop is gated to carry out a high-power charge-discharge mode or a normal charge-discharge mode according to the electrical parameters of the external equipment 20 and the electrical parameters of the power battery 104, the compatibility of the normal charge-discharge mode and the high-power charge-discharge mode can be realized only by arranging a branch in the switch module 102, the model of the DC converter 103 does not need to be changed, the overcurrent capacity of the internal elements of the DC converter 103 does not need to be increased, the realization cost of the whole circuit is low, and the output capacity of external equipment or a power battery is utilized to the maximum extent, wherein the normal charging and discharging mode is the original charging and discharging mode of the vehicle.
In one embodiment, as shown in fig. 2, when the external device 20 is a charging device, the external device 20 includes a dc charger 201 and a charging gun 202, the dc charger 201 is connected to the charging gun 202, the charging gun 202 is connected to the charging port 101, and the dc charger 201 transmits an electrical parameter indicating its maximum output capacity to the battery manager 105.
The electrical parameter of the maximum output capacity may be the highest output voltage, the lowest output voltage, the maximum output current or the minimum output current of the charger, and is determined according to 10.2.3 of a communication protocol GB27930 between the electric vehicle off-board conductive charger and the battery management system: after the charging system of the electric automobile is connected, the charger sends a maximum output capacity message of the charger to the battery manager, wherein the maximum output capacity message comprises the highest output voltage, the lowest output voltage, the maximum output current and the minimum output current of the charger, and the battery manager can selectively control the first charging and discharging loop or the second charging and discharging loop to be conducted according to the electric parameters sent by the charger in the protocol.
The present embodiment has the following effects: after the dc charger 201 is connected to the charging port, the battery manager 105 may obtain an electrical parameter output by the dc charger 201 through the charging port 101, and implement control of conduction of the first charge-discharge loop or the second charge-discharge loop according to the electrical parameter.
As an embodiment, the electrical parameter of the maximum output capacity is a maximum output voltage, and the electrical parameter of the power battery is a maximum charging voltage of the power battery; the battery manager 105 controls the first charge-discharge loop or the second charge-discharge loop to be conducted according to the maximum output voltage of the direct current charger 201 and the highest charge voltage of the power battery 104.
The highest charging voltage refers to the full-load voltage of the power battery, and the battery manager 105 controls the first charging and discharging loop to be conducted when the difference value between the maximum output voltage of the direct current charger 201 and the highest charging voltage of the power battery 104 is larger than or equal to a preset value; the battery manager 105 controls the second charging and discharging loop to be conducted when the difference between the maximum output voltage of the direct current charger 201 and the maximum charging voltage of the power battery 104 is smaller than a preset value, wherein the preset value is related to the maximum charging current and the internal resistance of the battery and is required to meet the current requirement of the battery
The present embodiment has the following effects: the battery manager 105 can select a corresponding charge-discharge loop to be conducted according to the maximum output voltage sent by the direct current charger 201 and the highest charging voltage of the power battery 104, so that the power battery 104 can be charged in different modes, and particularly when the highest charging voltage of the direct current charger 201 is detected to be higher, the DC-DC converter 103 is not required to perform voltage conversion, the first charge-discharge loop is controlled to be conducted, so that the direct current charger 201 is directly connected with the power battery 104 and charges the power battery 104 at high power, and the charging speed of the power battery 104 is improved.
As an embodiment, as shown in fig. 2, the switch module 102 includes a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal and a sixth terminal, the positive terminal of the charging port 101 is connected to the first terminal and the second terminal of the switch module 102, the third terminal of the switch module 102 is connected to the negative terminal of the charging port 101, the fourth terminal of the switch module 102 is connected to the positive terminal of the power battery 104, the fifth terminal of the switch module 102 is connected to the first terminal of the dc converter 103, the sixth terminal of the switch module 102 is connected to the second terminal of the dc converter 103 and the negative terminal of the power battery 104, and the third terminal of the dc converter 103 is connected to the positive terminal of the power battery 104.
The DC converter 103 may be a bidirectional DC-DC converter, the switch module 102 includes a second switch K2 and a third switch K3, a control terminal of the second switch K2 and a control terminal of the third switch K3 are connected to the battery manager 105, a first terminal and a second terminal of the second switch K2 are a second terminal and a fifth terminal of the switch module 102, respectively, and a first terminal and a second terminal of the third switch K3 are a third terminal and a sixth terminal of the switch module 102, respectively.
Among them, the power battery 104, the dc converter 103, the second switch K2, the positive terminal of the charging port 101, the external device 20, the negative terminal of the charging port 101, and the third switch K3 form a second charge and discharge circuit.
The present embodiment has the following effects: when the battery manager 105 controls the second switch K2 and the third switch K3 to be turned on, the dc converter 103 in the second charge-discharge loop is used for performing voltage conversion on the external device 20 or the power battery 104, thereby realizing energy exchange between the external device 20 and the power battery 104.
As an embodiment, the switch module 102 further includes a first switch K1, a control terminal of the first switch K1 is connected to the battery manager 105, and a first terminal and a second terminal of the first switch K1 are a first terminal and a fourth terminal of the switch module 102, respectively.
Among them, the power battery 104, the first switch K1, the positive terminal of the charging port 101, the external device 20, the negative terminal of the charging port 101, and the third switch K3 form a first charge and discharge circuit.
In this embodiment, when the battery manager 105 controls the first switch K1 and the third switch K3 to be turned on, the power battery 104 in the first charge-discharge loop is directly connected to the external device 20, so that the high-power energy between the external device 20 and the power battery 104 is rapidly exchanged.
The present embodiment has the following effects: by adding the third switch K3 in the switch module 102, the third switch K3 forms a branch between the charging port 101 and the power battery 104, so that the compatibility of the normal charging mode and the high-power charging mode of the power battery by the direct-current charger can be realized, the model of the direct-current converter 103 does not need to be changed, and the overcurrent capacity of the internal elements of the direct-current converter 103 does not need to be increased.
Further, the first switch K1, the second switch K2, and the third switch K3 are all contactors.
The first switch K1 and the second switch K2 are contactors that need to be controlled when the vehicle control unit realizes different direct-current charging modes, the third switch K3 is a negative contactor, the third switch K3 is a contactor that is shared by two charging modes, and the contactors adopted by the first switch K1 and the third switch K3 both have large overcurrent capacity, so that high-power charging on a charger with high output voltage and current capacity is realized.
An embodiment of the utility model provides an electric automobile, electric automobile include foretell electric automobile charging system, as shown in fig. 3, the mouth 101 that charges sets up in back suitcase 50, and power battery 104 sets up in passenger cabin 30, and battery manager 105 and switch module 102 set up in front deck 40, and the machine that charges is connected with electric automobile charging system 10 through the mouth 101 that charges.
As shown in fig. 4, the electric vehicle of the embodiment operates as follows:
s101, after the charger confirms that physical connection is established with a vehicle, the charger sends a charger handshake message to a battery manager;
s201: the battery manager replies a vehicle handshake message after receiving a charger handshake message, and simultaneously sends a pre-voltage reduction target value U0 to the bidirectional DC-DC converter for the chargers compatible with various specifications, so as to modulate a lower voltage U0 and transmit the lower voltage U0 to a charging port;
s102, the charger conducts insulation detection on the vehicle according to the highest allowable charging total voltage in the vehicle handshake message, and sends a charger identification message to the battery manager after the insulation detection is passed;
s202: the battery manager receives and then acquires the charging parameters of the power battery, and sends the charging parameters of the power battery to the charger, wherein the parameter of the current battery voltage of the finished vehicle power storage battery is kept consistent with U0 so as to ensure the voltage detection of the charger;
s103, after receiving the charging parameters of the power battery, the charger sends time synchronization information and a maximum output capacity message to a battery manager;
s203: the battery manager receives the maximum output capacity message of the charger, attracts a second switch K2 and a third switch K3 of the contactor if the vehicle charging is confirmed to be ready, so as to ensure that the voltage of the battery of the charging vehicle detected by the charger is U0, and sends a message of 'battery charging ready';
s104: the charger detects the voltage of the battery of the charging vehicle when receiving the message of 'battery charging readiness' of the vehicle, and all the following conditions are required to be met:
①, the difference between the battery voltage and the communication message battery voltage is less than or equal to +/-5%;
② is between the maximum and minimum output voltages of the charger.
If the voltage is confirmed to meet the requirement, adjusting the output voltage, attracting a contactor of the high-voltage charger, and sending charging readiness;
s204, the battery manager confirms that the battery manager passes the voltage detection of the charger after receiving the charging readiness of the charger, and the battery manager adjusts the final charging scheme according to the maximum output capacity message of the charger, and the following rules are followed:
① U (maximum voltage output capability of a charger) -U (maximum charging voltage of a power battery) is more than or equal to △ U, the charging is switched to a first charging and discharging loop to carry out direct current charging, a first switch K1 is attracted with a third switch K3, a second switch K2 is kept disconnected, the bidirectional DC-DC converter is not in the charging loop, and energy is directly transmitted to the power battery after passing through a contactor;
② U (voltage output capability of the direct current charging cabinet) -U (highest charging voltage of the power battery) < △ U, the second charging and discharging loop is adopted to carry out direct current charging, the second switch K2 is attracted with the third switch K3, the first switch K1 is kept disconnected, the bidirectional DC-DC converter is introduced into the charging loop, and energy is transmitted to the power battery after being controlled by the DC-DC converter.
The potential difference between the maximum output voltage of the direct current charger and the maximum charging voltage of the power battery at the vehicle end, which ensures that the charger can normally output in the whole charging process, is defined as △ U, and △ U is greater than 0.
As shown in fig. 5, in the charging parameter configuration stage, in order to ensure that the charging vehicle compatibly adjusts the switching between the first charging and discharging loop and the second charging and discharging loop, the process of controlling the conduction of the second charging and discharging loop to be switched to the conduction of the first charging and discharging loop is as follows:
the battery manager controls the bidirectional DC-DC converter to adjust the charging voltage to the voltage of the battery pack, then the charging machine is limited to charge by small current, the first switch K1 is attracted, and after the bidirectional DC-DC converter is shut off, the second switch K2 is switched to the first charging and discharging loop to be conducted.
It can be known from the above description that the embodiment of the utility model provides an including two different stages charging configuration stages and charge and discharge stage, two-way DC-DC converter is in operating condition and adjusts charging voltage in charging configuration stage, and two-way DC-DC converter stop work when first charge-discharge return circuit switches on in charge and discharge stage, and two-way DC-DC converter is in operating condition when second charge-discharge return circuit switches on in charge and discharge stage.
The embodiment of the utility model provides an electric automobile, including electric automobile charging system, electric automobile charging system is connected with the machine that charges through charging the mouth, carries out high-power charge-discharge mode or normal charge-discharge mode according to the first charge-discharge return circuit of the electric parameter gating of the machine that charges and power battery's electric parameter gating or second charge-discharge return circuit, need not the model of change direct current converter and increases direct current converter inner element's ability of overflowing, and the realization of whole circuit is with low costs.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The electric vehicle charging system is characterized by comprising a power battery, a direct current converter, a switch module and a charging port which are sequentially connected, wherein the switch module is also connected with the power battery;
when the charging port is connected with external equipment, a first charging and discharging loop is formed among the power battery, the switch module, the charging port and the external equipment, and a second charging and discharging loop is formed among the power battery, the direct current converter, the switch module, the charging port and the external equipment;
the battery manager obtains the electrical parameters of the external equipment and the electrical parameters of the power battery, and controls the switch module to enable the first charge-discharge loop or the second charge-discharge loop to be conducted according to the electrical parameters of the external equipment and the electrical parameters of the power battery.
2. The electric vehicle charging system according to claim 1, characterized in that: and the battery manager compares the electrical parameters of the external equipment with the electrical parameters of the power battery, and controls the switch module to switch on the first charge-discharge loop or the second charge-discharge loop according to a comparison result.
3. The electric vehicle charging system according to claim 2, characterized in that: the external equipment comprises a direct current charger and a charging gun, the direct current charger is connected with the charging gun, the charging gun is connected with the charging port, and the direct current charger sends an electric parameter representing the maximum output capacity of the direct current charger to the battery manager;
the electrical parameter of the maximum output capacity is the maximum output voltage, and the electrical parameter of the power battery is the highest charging voltage of the power battery;
and the battery manager controls the first charge-discharge loop or the second charge-discharge loop to be conducted according to a comparison result between the maximum output voltage of the direct current charger and the highest charging voltage of the power battery.
4. The electric vehicle charging system according to claim 3, characterized in that: the battery manager obtains that the difference value between the maximum output voltage of the direct current charger and the highest charging voltage of the power battery is larger than or equal to a preset value, and controls the first charging and discharging loop to be conducted;
and the battery manager controls the second charge-discharge loop to be conducted when the difference value between the maximum output voltage of the direct current charger and the highest charging voltage of the power battery is smaller than a preset value.
5. The electric vehicle charging system according to claim 1, characterized in that: the switch module comprises a first end, a second end, a third end, a fourth end, a fifth end and a sixth end, the positive end of the charging port is connected with the first end and the second end of the switch module respectively, the third end of the switch module is connected with the negative end of the charging port, the fourth end of the switch module is connected with the positive end of the power battery, the fifth end of the switch module is connected with the first end of the direct current converter, the sixth end of the switch module is connected with the second end of the direct current converter and the negative end of the power battery, and the third end of the direct current converter is connected with the positive end of the power battery.
6. The electric vehicle charging system according to claim 5, characterized in that: the switch module comprises a second switch and a third switch, the control end of the second switch and the control end of the third switch are both connected with the battery manager, the first end and the second end of the second switch are respectively the second end and the fifth end of the switch module, and the first end and the second end of the third switch are respectively the third end and the sixth end of the switch module.
7. The electric vehicle charging system of claim 6, wherein: the power battery, the DC converter, the second switch, the positive terminal of the charging port, the external device, the negative terminal of the charging port, and the third switch form a second charge-discharge loop.
8. The electric vehicle charging system of claim 6, wherein: the switch module further comprises a first switch, a control end of the first switch is connected with the battery manager, and a first end and a second end of the first switch are respectively a first end and a fourth end of the switch module.
9. The electric vehicle charging system of claim 8, wherein: the power battery, the first switch, the positive terminal of the charging port, the external device, the negative terminal of the charging port, and the third switch form a first charge-discharge loop.
10. An electric vehicle, characterized in that: the electric vehicle comprises the electric vehicle charging system of any one of claims 1 to 9.
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| CN201920767126.XU CN210792823U (en) | 2019-05-24 | 2019-05-24 | Electric automobile charging system and electric automobile |
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| CN112693356A (en) * | 2020-12-25 | 2021-04-23 | 车主邦（北京）科技有限公司 | Charging and discharging control method, charging and discharging pile, vehicle, system, medium and equipment |
| CN112793437A (en) * | 2020-12-30 | 2021-05-14 | 重庆金康赛力斯新能源汽车设计院有限公司 | Direct-current charging contactor, ultrahigh-voltage electric vehicle and power battery charging method |
| CN113910939A (en) * | 2020-07-09 | 2022-01-11 | 威马智慧出行科技（上海）有限公司 | Vehicle-mounted charger and control method thereof |
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| CN113942404A (en) * | 2020-06-30 | 2022-01-18 | 比亚迪股份有限公司 | Charging and discharging system, vehicle and alternating current-direct current power supply selection circuit |
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