CN110861498A - High-voltage charging circuit, method and device for electric automobile and electronic product - Google Patents
High-voltage charging circuit, method and device for electric automobile and electronic product Download PDFInfo
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- CN110861498A CN110861498A CN201911217680.1A CN201911217680A CN110861498A CN 110861498 A CN110861498 A CN 110861498A CN 201911217680 A CN201911217680 A CN 201911217680A CN 110861498 A CN110861498 A CN 110861498A
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- 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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- 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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/04—Cutting off the power supply under fault conditions
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- 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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling 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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a high-voltage charging circuit, a method and a device of an electric automobile and an electronic product. The invention forms a high-voltage charging circuit of an electric automobile through a battery circuit, a switch circuit and a battery cut-off circuit. According to the invention, the existing electric automobile can realize quick charging without adding an additional charging cable or thickening the existing charging cable, and the effect of improving a charging protocol and increasing the charging voltage to realize quick charging is achieved. The technical problem of the large capacity battery package vehicle that exists among the prior art can't quick charge is solved, reached under the prerequisite of guaranteeing safety, need not to change the whole car charging cable and only change the circuit of battery part and can realize quick charge's technological effect, satisfied more use scenes, promoted user experience.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a high-voltage charging circuit, a high-voltage charging method, a high-voltage charging device and an electronic product for an electric vehicle.
Background
Along with electric automobile's rapid development, the problem that electric motor car continuation of the journey mileage is not long enough is being solved along with electric automobile battery package energy constantly promotes, however along with the constantly promotion of battery package energy, the long time further extension of electric automobile charging is given to current battery charging outfit, the slow problem of electric motor car charging is further enlargied, current battery charging outfit has can't satisfy electric automobile's user demand, current charging standard can't realize exceeding 250 amperes the electric current charges electric automobile, lead to current charging power can't satisfy electric automobile's user demand.
A new high-power charging scheme is being developed in the industry, however, the new high-power charging scheme is still in a research stage, and cannot be applied in a mature way at present, and the new high-power charging scheme cannot meet the charging requirement under the condition that the interface of the whole vehicle is not changed according to the current development.
Disclosure of Invention
The invention mainly aims to provide a high-voltage charging circuit of an electric automobile, which solves the technical problem of improving charging power under the condition of unchanging an interface of the whole automobile.
In order to achieve the purpose, the high-voltage charging circuit of the electric automobile provided by the invention comprises a battery circuit, a switch circuit and a battery cut-off circuit which are sequentially connected; wherein the content of the first and second substances,
the switch circuit is used for switching the battery circuit to a series connection state when the battery circuit is charged; when the battery circuit supplies power, the battery circuit is switched to a parallel state;
the battery circuit is used for outputting voltage to supply power to the whole vehicle when the battery circuit is in a parallel connection state; when the charging device is in a series state, the voltage is increased and charging is carried out;
and the battery cut-off circuit is used for disconnecting the battery circuit from the voltage end and the grounding end when the battery circuit and the switch circuit are abnormal.
Preferably, the battery circuit comprises a first battery pack and a second battery pack; wherein the content of the first and second substances,
the positive pole of first battery package pass through switch circuit with the negative pole of second battery package is connected, the positive pole of second battery package with battery cutting off circuit connects, the negative pole of second battery package still passes through switch circuit with battery cutting off circuit connects, the negative pole of first battery package with battery cutting off circuit connects, the positive pole of first battery package still pass through switch circuit with battery cutting off circuit connects.
Preferably, the switching circuit includes a first switch, a second switch, and a third switch; wherein the content of the first and second substances,
the first end of the first switch is connected with the anode of the first battery pack, the second end of the first switch is connected with the battery cut-off circuit, the first end of the second switch is connected with the cathode of the second battery, the second end of the second switch is connected with the battery cut-off circuit, the first end of the third switch is connected with the anode of the first battery, and the second end of the third switch is connected with the cathode of the second battery.
Preferably, when the battery circuit is in a series state, the first switch and the second switch are open, and the third switch is closed; when the battery circuits are in a parallel state, the first switch and the second switch are closed, and the third switch is opened.
Preferably, the first battery pack and the second battery pack have the same internal structure and both comprise a battery pack and a battery management unit; wherein the content of the first and second substances,
the battery pack is used for storing and releasing electric energy;
and the battery management unit is used for acquiring the voltage value and the temperature information of the battery pack and managing the release and the storage of the electric energy by depending on the acquired voltage value and the acquired temperature information.
Preferably, a first end of the battery pack is connected to the battery cut-off circuit through the switch circuit, a second end of the battery pack is connected to the battery management unit, and a second end of the battery management unit is connected to the battery cut-off circuit through the switch circuit.
Preferably, the battery cut-off circuit includes a fourth switch, a fifth switch, a sixth switch, a first resistor, and an ammeter; wherein the content of the first and second substances,
a first end of the fourth switch is connected with the switch circuit, a second end of the fourth switch is connected with the voltage end, a first end of the fifth switch is connected with the first end of the fourth switch, a second end of the fifth switch is connected with a first end of the first resistor, and a second end of the first resistor is connected with a second end of the fifth switch; the first end of the ammeter is connected with the switch circuit, the second end of the ammeter is connected with the first end of the sixth switch, and the second end of the sixth switch is connected with the grounding end.
The invention also provides a high-voltage charging method for the electric automobile, which comprises the following steps:
the switching circuit switches the battery circuit to a series state when the battery circuit is charged and switches the battery circuit to a parallel state when the battery circuit supplies power;
when the battery circuit is in a parallel state, the output voltage supplies power to the whole vehicle; when the charging device is in a series state, the voltage is increased and charging is carried out;
and the battery cut-off circuit cuts off the connection between the battery circuit and the voltage end and the grounding end when the battery circuit and the switch circuit are abnormal.
The invention further provides an electric automobile high-voltage charging device which comprises the electric automobile high-voltage charging circuit.
The invention also provides an electronic product which comprises the high-voltage charging device for the electric automobile.
The technical scheme of the invention is that the high-voltage charging circuit of the electric automobile is formed by a battery circuit, a switch circuit and a battery cut-off circuit which are connected in sequence. The principle that the charging power is equal to the voltage multiplied by the current is utilized, the battery circuit is connected in series when the battery is charged, the charging power is improved by improving the voltage under the condition of not changing the current, the technical effect of improving the charging power under the condition of not changing the interface of the whole automobile is achieved, and the battery circuit is switched to a parallel connection state when the automobile is supplied with power through the switch circuit, so that the output voltage of the battery is ensured to be within the working voltage range of the automobile; and finally, whether the charging and discharging are normal or not is monitored in real time through a battery cut-off circuit, and when the charging and discharging are abnormal, the circuit is cut off in time to ensure the power utilization safety.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of a high voltage charging circuit for an electric vehicle according to the present invention;
FIG. 2 is a schematic circuit diagram of another embodiment of a high-voltage charging circuit for an electric vehicle according to the present invention;
the reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Battery circuit | S1-S6 | First to |
| 200 | Switching circuit | R1 | A |
| 300 | Battery cut-off circuit | A | |
| 110 | |
120 | Second battery pack |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should be considered to be absent and not within the protection scope of the present invention.
Referring to fig. 1, the present embodiment provides an electric vehicle high-voltage charging circuit, which includes a battery circuit 100, a switch circuit 200, and a battery cut-off circuit 300, which are connected in sequence; wherein the content of the first and second substances,
the switch circuit 200 is configured to switch the battery circuit 100 to a series connection state when the battery circuit 100 is charged; when the battery circuit 100 supplies power, the battery circuit 100 is switched to a parallel state;
the battery circuit 100 is used for outputting voltage to supply power to the whole vehicle when the battery circuit is in a parallel connection state; when the charging device is in a series state, the voltage is increased and charging is carried out;
the battery cut-off circuit 300 is configured to disconnect the battery circuit 100 from the voltage terminal and the ground terminal when the battery circuit 100 and the switch circuit 200 are abnormal.
It should be noted that, in the present embodiment, the switch circuit 200 is controlled by a micro control unit of the electric vehicle, wherein the micro control unit may be integrated into the switch circuit 200, which is connected to the battery cut-off circuit 300 and the battery circuit 100, detects the states of the two circuits, and determines whether the connection mode of the battery circuit 100 needs to be switched according to the states of the two circuits, and in the present embodiment, all switches in the switch circuit 200 can complete state switching in a very short time, i.e., from an off state to an on state or from an on state to an off state, and the delay of switching the states of the switches in the switch circuit 200 is negligible in this application, i.e., it can be considered that the switches in the switch circuit 200 can perform state switching simultaneously.
It is easy to understand that, since the charging power is equal to the charging voltage multiplied by the charging current, and the internal resistance of the charging device and the charging cable needs to be reduced to increase the charging current, the interface scheme needs to be changed, otherwise the charging device and the charging cable are easily damaged due to heating, so according to the existing charging standard, the upper limit of the method for increasing the charging power by increasing the current already exists at about 250 amperes, so that without changing the interface scheme, the charging power is increased by increasing the voltage in the technical scheme of the present embodiment, for example, according to the current regulations, the charging voltage of the household electric vehicle is about 200 volts to 400 volts, the common charging voltage is 380 volts, the output voltage range of the dc charging post is close to 200 volts to 750 volts, when the dc charging post is used for charging, the leading maximum charging current in China is 240 amperes, when the technical scheme of the present invention is used for charging, after the battery circuits 100 are connected in series, the bearable charging voltage is increased from about 200 volts to 400 volts to about 200 volts to 800 volts, and when a common direct current charging pile is used, the charging power of the electric vehicle using the scheme can reach up to 180 kilowatts, while the charging power of the electric vehicle not using the scheme is only 96 kilowatts at most.
It should be emphasized that the voltage terminal and the ground terminal are connected to the charging and discharging circuit inside the electric vehicle, and the circuit is additionally adjusted, so that the original vehicle battery cut-off circuit 300 and the battery circuit 100 are directly replaced by the electric vehicle high-voltage charging circuit of the present application, the battery cut-off circuit 300 in the present embodiment uses the current and the temperature to determine whether the charging and discharging of the battery are normal according to the principle of the present embodiment, and the battery cut-off unit is selected to be suitable for the high voltage.
The technical scheme of the embodiment is that the serial-parallel connection mode of the battery circuit 100 is changed, the principle that the charging power is equal to the voltage multiplied by the current is utilized, the battery circuit 100 is connected in series when the battery is charged, the charging power is improved by improving the voltage under the condition that the current size is not changed, the technical effect that the charging power is improved under the condition that an interface of the whole vehicle is not changed is achieved, the battery cut-off circuit 300 is improved, whether charging and discharging are normal or not is monitored in real time by using the current and the temperature, and the scheme of high-voltage cut-off is used, so that when the battery is charged and discharged abnormally, the connection between the battery and the electric vehicle is.
Referring to fig. 2, the battery circuit 100 includes a first battery pack 110 and a second battery pack 120; wherein the content of the first and second substances,
the positive pole of first battery package 110 pass through switch circuit 200 with the negative pole of second battery package 120 is connected, the positive pole of second battery package 120 with battery cut-off circuit 300 is connected, the negative pole of second battery package 120 still pass through switch circuit 200 with battery cut-off circuit 300 is connected, the negative pole of first battery package 110 with battery cut-off circuit 300 is connected, the positive pole of first battery package 110 still pass through switch circuit 200 with battery cut-off circuit 300 is connected.
It is easy to understand that, in the technical scheme of the present embodiment, the principle of the scheme is demonstrated through circuit connection under the condition of two battery packs, and under the same principle, three or more battery packs can be used to further increase the charging voltage, so as to further increase the charging power.
Specifically, the switch circuit 200 includes a first switch S1, a second switch S2, and a third switch S3; wherein the content of the first and second substances,
a first terminal of the first switch S1 is connected to the positive electrode of the first battery pack 110, a second terminal of the first switch S1 is connected to the battery cut-off circuit 300, a first terminal of the second switch S2 is connected to the negative electrode of the second battery, a second terminal of the second switch S2 is connected to the battery cut-off circuit 300, a first terminal of the third switch S3 is connected to the positive electrode of the first battery, and a second terminal of the third switch S3 is connected to the negative electrode of the second battery.
It should be noted that in this embodiment, the first switch S1, the second switch S2, and the third switch S3 are all connected by using contactors, that is, in this embodiment, the serial-parallel scheme of the battery pack can be changed by controlling the on-off state of the contactors, so as to increase the system voltage; charging current can be properly reduced under the condition of ensuring that charging power is unchanged, so that the charging safety of the electric automobile can be ensured through a more flexible charging scheme.
Specifically, when the battery circuit 100 is in a series state, the first switch S1 and the second switch S2 are open, and the third switch S3 is closed; when the battery circuits 100 are in the parallel state, the first switch S1 and the second switch S2 are closed, and the third switch S3 is open.
It is worth emphasizing that, according to the technical solution of the present application, the series-parallel switching of the two battery packs is completed through the three switches, wherein the first switch S1 and the second switch S2 can be controlled by using the same control signal, and during the switching of the series-parallel mode, the switching of the three switches needs to be performed simultaneously, otherwise, there is a risk of short circuit.
Specifically, the first battery pack 110 and the second battery pack 120 have the same internal structure, and each includes a battery pack and a battery management unit; wherein the content of the first and second substances,
the battery pack is used for storing and releasing electric energy;
and the battery management unit is used for acquiring the voltage value and the temperature information of the battery pack and managing the release and the storage of the electric energy by depending on the acquired voltage value and the acquired temperature information.
It should be noted that, in this embodiment, a battery pack and a battery management unit are arranged inside the battery pack, the input and output voltages of the battery pack can be adjusted by adjusting the number and connection mode of the batteries in the battery pack, and the battery management unit can disconnect the circuits outside the battery pack from the battery pack in time when the switching circuit 200 switches a fault to cause a short circuit of the batteries, so as to further ensure the safety of the vehicle.
Specifically, a first end of the battery pack is connected to the battery cut-off circuit 300 through the switch circuit 200, a second end of the battery pack is connected to the battery management unit, and a second end of the battery management unit is connected to the battery cut-off circuit 300 through the switch circuit 200.
It is easy to understand that, the battery management unit in the battery pack is connected to the battery cut-off circuit 300, and the temperature information of the battery pack can be sent to the battery cut-off circuit 300 through the connection, so that the use safety of the electric vehicle can be ensured more flexibly.
Specifically, the battery cut-off circuit 300 includes a fourth switch S4, a fifth switch S5, a sixth switch S6, a first resistor R1, and an ammeter a; wherein the content of the first and second substances,
a first terminal of the fourth switch S4 is connected to the switch circuit 200, a second terminal of the fourth switch S4 is connected to the voltage terminal, a first terminal of the fifth switch S5 is connected to a first terminal of the fourth switch S4, a second terminal of the fifth switch S5 is connected to a first terminal of the first resistor R1, and a second terminal of the first resistor R1 is connected to a second terminal of the fifth switch S5; a first terminal of the ammeter a is connected to the switch circuit 200, a second terminal of the ammeter a is connected to a first terminal of the sixth switch S6, and a second terminal of the sixth switch S6 is connected to the ground terminal.
It should be noted that the ammeter a can help the battery cut-off circuit 300 to monitor whether the charging and discharging of the circuit are normal, and if the scheme uses an independent micro control unit to manage the charging and discharging of the battery, the charging and discharging safety of the electric vehicle can be further ensured through the current information collected by the ammeter a in the battery cut-off circuit 300 and the self information collected by the battery circuit 100.
This embodiment is through the battery package that uses electrified pond management unit, with detect charging through the testing current, whether normal battery cut-off circuit 300 of discharging has further ensured charging when this scheme of electric automobile use, discharge safety, and choose for use the high pressure cut-off scheme as battery cut-off circuit 300's design scheme, make holistic design more reasonable and effective, make this application technical scheme charge, the in-process of discharging, to abnormal conditions, furthest's guarantee user's life and property safety, user experience has been promoted.
The invention also provides a high-voltage charging method for the electric automobile, which comprises the following steps:
the switch circuit 200 switches the battery circuit 100 to a series state when the battery circuit 100 is charged, and switches the battery circuit 100 to a parallel state when the battery circuit 100 is powered;
when the battery circuit 100 is in a parallel state, the output voltage supplies power to the whole vehicle; when the charging device is in a series state, the voltage is increased and charging is carried out;
the battery cut-off circuit 300 disconnects the battery circuit 100 from the voltage terminal and the ground terminal when the battery circuit 100 and the switch circuit 200 are abnormal;
the method is implemented in the high-voltage charging circuit of the electric vehicle, so that at least all the beneficial effects brought by the technical scheme of the embodiment are achieved, and further description is omitted.
The invention further provides an electric vehicle high-voltage charging device, which comprises the electric vehicle high-voltage charging circuit, and the specific structure of the electric vehicle high-voltage charging device refers to the above embodiments.
The invention further provides an electronic product, which includes the above-mentioned electric vehicle high-voltage charging device, and the specific structure of the electronic product refers to the above-mentioned embodiments.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The high-voltage charging circuit of the electric automobile is characterized by comprising a battery circuit, a switch circuit and a battery cut-off circuit which are sequentially connected; wherein the content of the first and second substances,
the switch circuit is used for switching the battery circuit to a series connection state when the battery circuit is charged; when the battery circuit supplies power, the battery circuit is switched to a parallel state;
the battery circuit is used for outputting voltage to supply power to the whole vehicle when the battery circuit is in a parallel connection state; when the charging device is in a series state, the voltage is increased and charging is carried out;
and the battery cut-off circuit is used for disconnecting the battery circuit from the voltage end and the grounding end when the battery circuit and the switch circuit are abnormal.
2. The high voltage charging circuit for an electric vehicle of claim 1, wherein said battery circuit comprises a first battery pack and a second battery pack; wherein the content of the first and second substances,
the positive pole of first battery package pass through switch circuit with the negative pole of second battery package is connected, the positive pole of second battery package with battery cutting off circuit connects, the negative pole of second battery package still passes through switch circuit with battery cutting off circuit connects, the negative pole of first battery package with battery cutting off circuit connects, the positive pole of first battery package still pass through switch circuit with battery cutting off circuit connects.
3. The high voltage charging circuit for electric vehicle as claimed in claim 2, wherein said switching circuit comprises a first switch, a second switch and a third switch; wherein the content of the first and second substances,
the first end of the first switch is connected with the anode of the first battery pack, the second end of the first switch is connected with the battery cut-off circuit, the first end of the second switch is connected with the cathode of the second battery, the second end of the second switch is connected with the battery cut-off circuit, the first end of the third switch is connected with the anode of the first battery, and the second end of the third switch is connected with the cathode of the second battery.
4. The high voltage charging circuit for electric vehicle as claimed in claim 3, wherein when the battery circuit is in series, the first switch and the second switch are open, and the third switch is closed; when the battery circuits are in a parallel state, the first switch and the second switch are closed, and the third switch is opened.
5. The high-voltage charging circuit for the electric automobile according to claim 2, wherein the first battery pack and the second battery pack have the same internal structure and each comprises a battery pack and a battery management unit; wherein the content of the first and second substances,
the battery pack is used for storing and releasing electric energy;
and the battery management unit is used for acquiring the voltage value and the temperature information of the battery pack and managing the release and the storage of the electric energy by depending on the acquired voltage value and the acquired temperature information.
6. The high voltage charging circuit for electric vehicle as claimed in claim 5, wherein a first terminal of said battery pack is connected to said battery cut-off circuit through said switch circuit, a second terminal of said battery pack is connected to said battery management unit, and a second terminal of said battery management unit is connected to said battery cut-off circuit through said switch circuit.
7. The high-voltage charging circuit for the electric automobile according to claim 1, wherein the battery cut-off circuit comprises a fourth switch, a fifth switch, a sixth switch, a first resistor and an ammeter; wherein the content of the first and second substances,
a first end of the fourth switch is connected with the switch circuit, a second end of the fourth switch is connected with the voltage end, a first end of the fifth switch is connected with the first end of the fourth switch, a second end of the fifth switch is connected with a first end of the first resistor, and a second end of the first resistor is connected with a second end of the fifth switch; the first end of the ammeter is connected with the switch circuit, the second end of the ammeter is connected with the first end of the sixth switch, and the second end of the sixth switch is connected with the grounding end.
8. The high-voltage charging method for the electric automobile is characterized by comprising the following steps of:
the switching circuit switches the battery circuit to a series state when the battery circuit is charged and switches the battery circuit to a parallel state when the battery circuit supplies power;
when the battery circuit is in a parallel state, the output voltage supplies power to the whole vehicle; when the charging device is in a series state, the voltage is increased and charging is carried out;
and the battery cut-off circuit cuts off the connection between the battery circuit and the voltage end and the grounding end when the battery circuit and the switch circuit are abnormal.
9. An electric vehicle high-voltage charging device, characterized in that the electric vehicle high-voltage charging device comprises the electric vehicle high-voltage charging circuit according to any one of claims 1 to 7.
10. An electronic product, characterized in that the electronic product comprises the high-voltage charging device for electric vehicles according to claim 9.
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| CN201911217680.1A CN110861498A (en) | 2019-11-29 | 2019-11-29 | High-voltage charging circuit, method and device for electric automobile and electronic product |
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| CN201911217680.1A CN110861498A (en) | 2019-11-29 | 2019-11-29 | High-voltage charging circuit, method and device for electric automobile and electronic product |
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Application publication date: 20200306 |