CN112659902A - Electric vehicle and lower electric system thereof - Google Patents
Electric vehicle and lower electric system thereof Download PDFInfo
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- CN112659902A CN112659902A CN202011626171.7A CN202011626171A CN112659902A CN 112659902 A CN112659902 A CN 112659902A CN 202011626171 A CN202011626171 A CN 202011626171A CN 112659902 A CN112659902 A CN 112659902A
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- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
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Abstract
The application discloses electric vehicle and lower electric system thereof, this electric vehicle is including being provided with main switch's power battery, and this power battery passes through the drive circuit electricity and connects in driving motor, lower electric system includes: the electric heating equipment is connected with the driving motor in parallel and is electrically connected with the power battery; the high-voltage electrical equipment is connected with the electric heating equipment in parallel and is electrically connected with the power battery; and the controller is electrically connected with the power battery and the electric heating equipment respectively, wherein: when the controller receives a power-off command, the controller sends a working command to the electric heating equipment so as to convert electric energy retained in the power battery and/or the high-voltage electric equipment into heat energy. According to the technical scheme of this application, can be with the electric energy conversion of staying among electric vehicle's power battery and/or the high-voltage electrical equipment heat energy to realize better security and economic nature.
Description
Technical Field
The present application relates to the field of electric vehicles, and more particularly, to an electric vehicle and a lower power system thereof.
Background
In recent years, the development of electric vehicles is increasing. For electric vehicles, people seek better driving experience and longer driving range, and meanwhile seek better safety.
The safety of the electric vehicle mainly lies in the management and control of various electric devices of the electric vehicle, such as the management of a power battery, the management of a motor and the like. For safety, in addition to ensuring that various electrical devices are in normal working states in daily use of the vehicle, especially in emergency situations, such as traffic accidents like collision, the safety of the vehicle is ensured, which needs to prevent the power battery from exploding and prevent high-voltage electricity carried by the electrical devices from damaging passengers in the vehicle.
Currently, when considering the safety of electric vehicles, people consider more the control scheme of the safety of the power battery. For example, when the electric vehicle is powered off normally or in emergency, the driving circuit of the power battery pack is ensured to be disconnected in time through various technical means.
However, the conventional power-off control method has the disadvantage that other dangerous factors, especially other high-voltage electrical devices (such as a motor, an air conditioner compressor, a motor controller, a vehicle-mounted charger DC/DC converter, etc.), are intentionally and unintentionally ignored because people pay more attention to the power battery. Specifically, even if the driving circuit of the power battery is disconnected, some high-voltage electrical devices accumulate large electric quantity during the working period, so that high-voltage electric energy still exists, which causes a safety hazard to vehicle personnel, and particularly when the vehicle has an accident such as collision, the high-voltage electric energy easily causes an electric shock accident to the vehicle personnel.
Therefore, how to provide a power-off scheme with higher safety for the electric vehicle becomes a technical problem to be solved in the field.
Disclosure of Invention
In view of the above, the present application proposes a lower electric system of an electric vehicle including a power battery provided with a main switch, the power battery being electrically connected to a driving motor through a driving circuit, the lower electric system including: the electric heating equipment is connected with the driving motor in parallel and is electrically connected with the power battery; the high-voltage electrical equipment is connected with the electric heating equipment in parallel and is electrically connected with the power battery; and the controller is electrically connected with the power battery and the electric heating equipment respectively, wherein: when the controller receives a power-off command, the controller sends a working command to the electric heating equipment so as to convert electric energy retained in the power battery and/or the high-voltage electric equipment into heat energy.
Preferably, the power battery of the electric vehicle is a rechargeable battery such as a lithium battery or a nickel-metal hydride battery, when the controller receives a power-off command, the controller sends a switch-off command to a main switch of the power battery, and the controller sends a working command to the electric heating device, so as to convert electric energy retained in the high-voltage electric device into heat energy.
Preferably, the power battery of the electric vehicle is a fuel cell such as a hydrogen fuel cell, and when the controller receives a power-off command, the controller sends an operation command to the electric heating device to convert electric energy retained in the fuel cell and/or the high-voltage electric device into heat energy.
Preferably, the electric vehicle includes a fuel storage tank that supplies fuel gas to the fuel cell through a fuel supply line by a fuel pump electrically connected to the controller, the controller further giving a command to stop operation of the fuel pump when the controller receives a power-off command; and/or the controller shuts off the fuel supply line.
Preferably, the lower power system includes a voltage measuring device electrically connected to the controller, the voltage measuring device is configured to detect a voltage of the high-voltage electrical equipment, and the controller issues a stop instruction to the electrical heating device when a voltage value measured by the voltage measuring device is lower than a predetermined voltage value.
Preferably, the predetermined voltage value is 36V or 24V or 12V.
Preferably, the controller includes a timer, the timer starts counting from the controller sending an operation instruction to the electric heating device, and the controller sends an operation stop instruction to the electric heating device when the time counted by the timer exceeds a predetermined time.
Preferably, the predetermined time is 100ms to 800ms, preferably 500 ms.
Preferably, the electric heating device comprises 1 thin film resistance heating unit, the lower electric system has a normal lower electric state and an emergency lower electric state, and the working power of the electric heating device in the emergency lower electric state is larger than that of the electric heating device in the normal lower electric state.
Preferably, the electric heating apparatus includes a plurality of thin film resistance heat generating units arranged in parallel with each other, and the lower electric system has a normal lower electric state in which the number of heat generating operations performed by the thin film resistance heat generating units of the electric heating apparatus is smaller than the number of heat generating operations performed by the thin film resistance heat generating units of the electric heating apparatus in the emergency lower electric state.
According to another aspect of the application, an electric vehicle is also provided, wherein the electric vehicle is a hybrid vehicle or a pure electric vehicle and comprises the lower electric system.
According to the technical scheme of this application, the high-voltage electric energy that stays or remains in vehicle electrical system when more paying close attention to the power down, consequently when receiving the power down instruction for electric heating equipment works, convert the electric energy that stays among electric vehicle's power battery and/or the high-voltage electrical equipment into heat energy, thereby not only eliminated the high-voltage electric energy that stays, still with its recycle, in order to store in electric heating equipment's heat transfer medium, and then realize better security and economic nature.
Additional features and advantages of the present application will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate an embodiment of the invention and, together with the description, serve to explain the invention. In the drawings:
FIG. 1 is a block diagram of a power down system according to a preferred embodiment of the present application;
FIG. 2 is a flow chart of one preferred embodiment of a power down process according to the preferred embodiment of the present application.
Detailed Description
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, the present application proposes a lower electrical system of an electric vehicle including a power battery 10 provided with main switches 11,12, the power battery 10 being electrically connected to a drive motor 13 through a drive circuit, the lower electrical system including: an electric heating device 14, wherein the electric heating device 14 is arranged in parallel with the driving motor 13 and is electrically connected to the power battery 10; a high-voltage electrical device 15, the high-voltage electrical device 15 being arranged in parallel with the electric heating device 14 and being electrically connected to the power battery 10; and a controller 16, the controller 16 being electrically connected to the power battery 10 and the electric heating device 14, respectively, wherein: when the controller 16 receives a power-off command, the controller 16 sends an operation command to the electric heating device 14 to convert the electric energy retained in the power battery 10 and/or the high-voltage electric device 15 into heat energy.
As described above, the conventional power-off control method has a disadvantage that, because other high-voltage electrical devices (such as a motor, an air conditioner compressor, a motor controller, a vehicle-mounted charger DC/DC converter, etc.) except for the power battery in the electric vehicle are ignored, even if the driving circuit of the power battery is disconnected, high-voltage electric energy accumulated by some high-voltage electrical devices still exists, which causes a safety hazard to vehicle personnel.
To this problem, the technical scheme of this application focuses on remaining electric energy. When the controller 16 receives a power-off command, the controller 16 sends an operation command to the electric heating device 14 to convert the electric energy retained in the power battery 10 and/or the high-voltage electric device 15 into heat energy. It should be noted that the technical solution of the present application does not exclude the control of the disconnection of the power battery, but rather focuses more on the power-down scheme of other high-voltage electrical devices. Thus, in a preferred embodiment, the two may be combined together. In the technical scheme of this application, will be detained or remain the electric quantity and carry to electric heating equipment to consume these high-pressure electric energy that are detained or remain, the heat energy storage that obtains simultaneously converts is in the heat-conducting medium among the electric heating equipment, in order to realize energy-conserving effect.
According to different application conditions, different technical measures can be adopted.
For example, in the case where the power battery 10 of the electric vehicle is a rechargeable battery such as a lithium battery or a nickel-metal hydride battery, when the controller 16 receives a power-off command, the controller 16 sends a switch-off command to the main switches 11 and 12 of the power battery 10, and the controller 16 sends an operation command to the electric heating device 14 to convert electric energy retained in the high-voltage electric device 15 into heat energy. In other words, in this case, after the controller 16 obtains the power-down command, the rechargeable battery is disconnected from the electrical connection with the electrical equipment, and the power in the rechargeable battery is in a stable static state. Therefore, the high-voltage electric energy staying or remaining is mainly stored in the high-voltage electric apparatus 15, as shown in fig. 1, at this time, due to the parallel connection relationship between the high-voltage electric apparatus 15 and the electric heating apparatus 14, the high-voltage electric apparatus 15 can be allowed to supply electric power to the electric heating apparatus 14 to convert the remaining electric energy into heat energy of the electric heating apparatus 14.
For another example, in the case where the power cell 10 of the electric vehicle is a fuel cell (e.g., a hydrogen fuel cell), when the controller 16 receives a power-off command, the controller 16 issues an operation command to the electric heating device 14 to convert electric energy retained in the fuel cell and the high-voltage electric device 15 into heat energy. This is because, in a fuel cell such as a hydrogen fuel cell, even if the electrical connection between the fuel cell and the electric equipment is cut off in response to a power-down command, a chemical reaction in which chemical energy is converted into electrical energy still occurs inside the fuel cell, that is, the fuel cell still has an electric quantity output or accumulated. Therefore, in order to consume the remaining electric energy, the electric heater can be connected to the upstream position of the main switches 11 and 12, and thus the fuel cell can be electrically connected even if the main switches are disconnected; or the residual electric energy is consumed by the electric heating equipment, and then the main switch is switched off.
For an electric vehicle in which a fuel cell is a power cell, the electric vehicle includes a fuel storage tank that delivers fuel gas to the fuel cell by a fuel pump through a fuel supply line. Preferably, the fuel pump is electrically connected to the controller 16, and the controller 16 further issues a stop command to the fuel pump when the controller 16 receives a power-off command; and/or the controller 16 shuts off the fuel supply line. Therefore, by stopping the fuel pump and/or cutting off the fuel supply management, the chemical reaction inside the fuel cell can be immediately terminated to reduce the electric power still generated after the power-off command is received.
The controller 16 may be any suitable control component, such as a PLC, a single chip, a control unit on the electric vehicle, such as a BMS, an ECU, etc., a control module or a control circuit board of the electric heating device, or a combination of the control unit on the electric vehicle and the control unit of the electric heating device. The power-off command can be from an operator of the vehicle, such as normal power-off after parking, or from related sensors of the vehicle, such as electronic components like a collision sensor.
After the controller 16 sends a working instruction to the electric heating device 14, it sends a stop instruction according to the relevant working condition to stop the heating work of the electric heating device 14.
According to one embodiment of the present application, as shown in fig. 1, the lower power system includes a voltage measuring device 17 electrically connected to the controller 16, the voltage measuring device is configured to detect the voltage of the high-voltage electrical equipment 15, and the controller 16 issues a stop instruction to the electrical heating equipment 14 when the voltage value measured by the voltage measuring device 17 is lower than a predetermined voltage value.
In this embodiment, whether to stop the heating operation of the electric heating device 14 is determined according to the voltage value of the residual electric power in the high-voltage electric device 15. If the voltage value detected by the voltage measuring device 17 is higher than the predetermined voltage value, it indicates that the residual electric energy in the high-voltage electrical equipment 15 is not fully consumed and converted, and the electric heating equipment 14 is required to continue to work; when the voltage value detected by the voltage measuring device 17 is lower than the predetermined voltage value, it indicates that the residual electric energy in the high-voltage electric equipment 15 has reached the allowable range, and at this time, the controller 16 sends an instruction to stop the operation of the electric heating equipment 14.
The predetermined voltage value may be 36V or 24V or 12V according to different vehicle models.
As another embodiment, whether to stop the heating operation of the electric heating device 14 may be determined according to a time parameter. In this embodiment, the controller 16 includes a timer that starts counting the time from the controller 16 sending the operation instruction to the electric heating device 14, and when the time counted by the timer exceeds a predetermined time, the controller 16 sends the stop operation instruction to the electric heating device 14.
In this embodiment, when the controller 16 issues an operation instruction to the electric heating apparatus 14, the timer starts counting time, and the elapsed time is used as a parameter for stopping the operation of the electric heating apparatus. When the elapsed time is less than the preset time, the heating work of the electric heating equipment is considered not to be stopped; and when the elapsed time reaches a predetermined time, the heating operation of the electric heating apparatus is considered to be stopped. Preferably, the predetermined time is 100ms to 800ms, preferably 500 ms. The specific predetermined time parameter can be designed and selected according to different working conditions.
In the present application, the electric heating device may be a PTC electric heating device, or an electric heating device in which the resistance heat generating unit is a thin film resistor may be selected. Therefore, preferably, the electric heating device 14 includes 1 or more thin film resistance heat generating units, and the plurality of thin film resistance heat generating units are arranged in parallel with each other.
As described above, the power-off of the vehicle includes the normal power-off state and the emergency power-off state. Under the normal power-off state, the electric heating equipment can be heated under the low-power state; in the emergency power-off state, the electric heating equipment can be heated in a high-power state, so that the conversion from electric energy to heat energy can be completed in a shorter time. Therefore, the operating power of the electric heating device 14 in the emergency power-off state is preferably greater than the operating power of the electric heating device 14 in the normal power-off state.
The control of the power of the thin film resistance heating units can be realized by regulating and controlling the voltage and/or the current of the thin film resistance heating units, and preferably, in the case that a plurality of thin film resistance heating units arranged in parallel are arranged, the number of the thin film resistance heating units of the electric heating device 14 performing heating operation in the normal power-off state is smaller than the number of the thin film resistance heating units of the electric heating device 14 performing heating operation in the emergency power-off state. For example, in a normal power-down state, 1 resistance heating unit is allowed to perform a heating operation; in an emergency state, 2 or more than 2 thin film resistance heating units are allowed to perform heating work; or in a normal power-off state, allowing 2 resistance heating units to perform heating work; in the emergency state, 3 or more than 3 thin film resistance heating units are allowed to perform heating operation. Therefore, different responses to different working conditions of the normal power-off state and the emergency power-off state are realized by heating the film resistor heating units with different numbers in the two states.
The lower power system of the electric vehicle provided by the present application is described in detail above. A preferred embodiment of the operation of the lower power system is described below with reference to fig. 2.
As shown in fig. 2, after receiving the power-off command, the controller first determines whether the power-off command belongs to normal power-off or emergency power-off. If the normal power-down is adopted, the electric heating device is enabled to perform heating operation at low power (such as 50% of full power operation) until the discharge time reaches a preset time (such as 500ms) or the bus voltage of the driving circuit is less than a preset voltage (such as 36V). If the emergency power-off is adopted, the electric heating device is enabled to carry out heating operation at high power (such as full power 100 percent operation) until the discharging time reaches a preset time or the bus voltage of the driving circuit is less than a preset voltage.
In addition to the power down system, the present application also provides an electric vehicle, which is a hybrid vehicle or a pure electric vehicle, wherein the electric vehicle includes the power down system.
The preferred embodiments of the present application have been described in detail above, but the present application is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present application within the technical idea of the present application, and these simple modifications all belong to the protection scope of the present application.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described in the present application.
In addition, any combination of the various embodiments of the present application can be made, and the same should be considered as the disclosure of the present invention as long as the combination does not depart from the spirit of the present application.
Claims (11)
1. A lower electric system of an electric vehicle including a power battery (10) provided with main switches (11,12), the power battery (10) being electrically connected to a drive motor (13) through a drive circuit,
the lower power system comprises:
an electric heating device (14), the electric heating device (14) being arranged in parallel with the drive motor (13) and being electrically connected to the power battery (10);
a high-voltage electrical device (15), the high-voltage electrical device (15) being arranged in parallel with the electrical heating device (14) and being electrically connected to the power battery (10); and
a controller (16), the controller (16) being electrically connected to the power battery (10) and the electric heating device (14), respectively, wherein:
when the controller (16) receives a power-off command, the controller (16) sends a working command to the electric heating device (14) so as to convert electric energy retained in the power battery (10) and/or the high-voltage electric device (15) into heat energy.
2. The power discharging system of an electric vehicle according to claim 1, wherein the power battery (10) of the electric vehicle is a rechargeable battery such as a lithium battery or a nickel hydrogen battery,
when the controller (16) receives a power-off command, the controller (16) sends a cut-off command to the main switches (11,12) of the power battery (10), and the controller (16) sends a working command to the electric heating equipment (14) so as to convert electric energy retained in the high-voltage electric equipment (15) into heat energy.
3. The power take-off system of an electric vehicle according to claim 1, wherein the power cell (10) of the electric vehicle is a fuel cell such as a hydrogen fuel cell,
when the controller (16) receives a power-off command, the controller (16) sends an operation command to the electric heating device (14) to convert the electric energy retained in the fuel cell and the high-voltage electric device (15) into heat energy.
4. The power distribution system of an electric vehicle according to claim 3, wherein the electric vehicle includes a fuel storage tank that delivers fuel gas to the fuel cell through a fuel supply line by a fuel pump that is electrically connected to the controller (16),
upon receipt of a power-down command by the controller (16), the controller (16) further issuing a command to stop operation of the fuel pump; and/or the controller (16) shuts off the fuel supply line.
5. The lower electric system of an electric vehicle according to claim 1, wherein the lower electric system comprises a voltage measuring device (17) electrically connected to the controller (16) for detecting a voltage of the high voltage electrical equipment (15),
when the voltage value measured by the voltage measuring device (17) is lower than a predetermined voltage value, the controller (16) issues a stop instruction to the electric heating device (14).
6. The power down system of an electric vehicle according to claim 5, wherein the predetermined voltage value is 36V or 24V or 12V.
7. The power-down system of the electric vehicle according to claim 1, wherein the controller (16) includes a timer that starts timing from an operation instruction of the controller (16) to the electric heating device (14),
when the time counted by the timer exceeds a preset time, the controller (16) sends a stop working instruction to the electric heating device (14).
8. The power down system of an electric vehicle according to claim 7, wherein the predetermined time is 100ms to 800ms, preferably 500 ms.
9. The power down system of the electric vehicle according to claim 1, wherein the electric heating device (14) includes 1 thin film resistance heat generating unit, the power down system has a normal power down state and an emergency power down state, and an operating power of the electric heating device (14) in the emergency power down state is larger than an operating power of the electric heating device (14) in the normal power down state.
10. The power down system of an electric vehicle according to claim 1, wherein the electric heating device (14) includes a plurality of thin film resistance heat generating units arranged in parallel with each other,
the power-off system has a normal power-off state and an emergency power-off state, and the number of the thin film resistance heating units of the electric heating equipment (14) in the normal power-off state is smaller than that of the thin film resistance heating units of the electric heating equipment (14) in the emergency power-off state.
11. An electric vehicle, which is a hybrid vehicle or a pure electric vehicle, wherein the electric vehicle comprises the powering down system of any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011626171.7A CN112659902A (en) | 2020-12-31 | 2020-12-31 | Electric vehicle and lower electric system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011626171.7A CN112659902A (en) | 2020-12-31 | 2020-12-31 | Electric vehicle and lower electric system thereof |
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| CN112659902A true CN112659902A (en) | 2021-04-16 |
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| CN112060912A (en) * | 2020-09-10 | 2020-12-11 | 安徽鸿创新能源动力有限公司 | Multistage active discharge system and method for high-voltage bus capacitor of electric automobile |
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| US20140125260A1 (en) * | 2011-07-20 | 2014-05-08 | Toyota Jidosha Kabushiki Kaisha | Vehicle and method for controlling vehicle |
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