CN107444123B - Power supply device, power supply method and electric vehicle - Google Patents
Power supply device, power supply method and electric vehicle Download PDFInfo
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- CN107444123B CN107444123B CN201610380178.2A CN201610380178A CN107444123B CN 107444123 B CN107444123 B CN 107444123B CN 201610380178 A CN201610380178 A CN 201610380178A CN 107444123 B CN107444123 B CN 107444123B
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- 230000005611 electricity Effects 0.000 claims abstract description 26
- 238000012423 maintenance Methods 0.000 claims description 34
- 230000001960 triggered effect Effects 0.000 claims description 6
- 230000004913 activation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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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
- B60L3/003—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to inverters
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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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- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a power supply device, comprising: the system comprises a high-voltage power battery, a standby DC-DC, a vehicle-mounted low-voltage storage battery and a battery manager; the high-voltage power battery is used for providing power for the electric vehicle and providing high voltage electricity for high-voltage electric equipment; the standby DC-DC is connected with the high-voltage power battery in parallel and is used for converting high voltage provided by the high-voltage power battery into low voltage; the vehicle-mounted low-voltage storage battery is connected with the low-voltage electric equipment and the standby DC-DC in parallel and is used for providing low voltage electricity for the low-voltage electric equipment and the battery manager; the battery manager is used for starting the standby DC-DC when the electric vehicle needs to be maintained or the voltage of the vehicle-mounted low-voltage storage battery is lower than a preset threshold value. The invention also provides a power supply method and an electric vehicle. When the power supply device is utilized, even if the voltage of the vehicle-mounted low-voltage storage battery is insufficient, the low-voltage power supply can be still carried out on the low-voltage electric equipment of the electric vehicle under the condition that the vehicle-mounted low-voltage storage battery is not replaced.
Description
Technical Field
The present invention relates to the field of power supply equipment, and in particular, to a power supply device, a power supply method, and an electric vehicle including the power supply device.
Background
Currently, when a vehicle is repaired, a high-voltage system in the vehicle needs to be disconnected for safety, and at the moment, the on-board DC-DC does not work. However, during servicing of the vehicle, there is still a need to provide a low voltage power supply on board the vehicle. The electric bus has more low-voltage power supply equipment and more power utilization equipment, a low-voltage system is supplied with power by a low-voltage storage battery, and the electric quantity of the vehicle-mounted low-voltage storage battery cannot be supplemented at the moment, so that the electric quantity of the storage battery is exhausted quickly.
Therefore, how to supply power to the vehicle at a low voltage when the high-voltage system is disconnected becomes an urgent technical problem to be solved in the field.
Disclosure of Invention
An object of the present invention is to provide a power supply device, a power supply method, and an electric vehicle, which can perform low-voltage power supply to a vehicle when a high-voltage system is cut off.
In order to achieve the above object, the present invention provides a power feeding device, which is disposed in an electric vehicle, the power feeding device including: the system comprises a high-voltage power battery, a standby DC-DC, a vehicle-mounted low-voltage storage battery and a battery manager;
the high-voltage power battery is used for providing power for the electric vehicle and providing high voltage electricity for high-voltage electric equipment;
the standby DC-DC is connected with the high-voltage power battery in parallel and is used for converting high-voltage power provided by the high-voltage power battery into low-voltage power;
the vehicle-mounted low-voltage storage battery is connected with low-voltage electric equipment and the standby DC-DC in parallel and is used for providing low voltage electricity for the low-voltage electric equipment and the battery manager;
the battery manager is used for starting the standby DC-DC when the electric vehicle needs to be maintained or the voltage of the vehicle-mounted low-voltage storage battery is lower than a preset threshold value.
Optionally, the power supply device further includes: an onboard DC-DC and manual switch;
the vehicle-mounted DC-DC is connected with the high-voltage power battery, the vehicle-mounted low-voltage storage battery and the low-voltage electric equipment in parallel, and is used for converting high-voltage electricity provided by the high-voltage power battery into low-voltage electricity and supplying the low-voltage electricity to at least one of the low-voltage electric equipment and the vehicle-mounted low-voltage storage battery;
the manual switch is connected between the low-voltage positive output end of the standby DC-DC and the battery manager in series, and when the manual switch is closed, the battery manager can be triggered to detect the state of the manual switch;
the battery manager is further used for starting the standby DC-DC when the state of the manual switch is detected to be closed, converting high-voltage power provided by the high-voltage power battery into low-voltage power through the standby DC-DC, and supplying the low-voltage power to at least one of the low-voltage electric equipment and the vehicle-mounted low-voltage storage battery.
Optionally, the power supply device further includes a maintenance switch, the maintenance switch is connected in series between the high-voltage positive output terminal of the high-voltage power battery and the positive terminal of the high-voltage electric equipment, and when the maintenance switch is closed, the battery manager can be triggered to detect a state of the maintenance switch;
the battery manager is also used for controlling the high-voltage power battery to suspend to provide power for the electric vehicle and provide high-voltage electricity for the high-voltage electric equipment when detecting that the state of the maintenance switch is disconnected.
Optionally, the power supply device further includes: a standby low-voltage storage battery and a standby low-voltage storage battery switch,
the standby low-voltage storage battery is connected with the standby DC-DC in parallel and used for providing low-voltage electricity for the low-voltage electric equipment and the battery manager;
the standby low-voltage storage battery switch is connected between the low-voltage positive electrode output end of the standby low-voltage storage battery and the battery manager in series;
the battery manager is also used for controlling the standby low-voltage storage battery switch to keep a normally-closed state and controlling the standby low-voltage storage battery switch to be switched off when the vehicle-mounted DC-DC operates normally.
Optionally, the power supply device further includes: a starting switch and a power supply switch;
the starting switch is connected between the battery manager and a grounding terminal in series, and when the starting switch is closed, one end of the battery manager is in a low level;
the power supply switch is connected in series between the battery manager and the low-voltage positive output end of the vehicle-mounted low-voltage storage battery, and when the power supply switch is switched off, the vehicle-mounted low-voltage storage battery provides low voltage electricity for the standby DC-DC and the battery manager;
the battery manager is also used for starting the standby DC-DC when detecting a low level, converting the high-voltage power provided by the high-voltage power battery into low-voltage power through the standby DC-DC, and supplying the low-voltage power to at least one of the low-voltage electric equipment and the vehicle-mounted low-voltage storage battery.
As another aspect of the present invention, there is provided a power supply method, applied to an electric vehicle, the method including:
detecting whether the electric vehicle needs to be maintained or whether the voltage of a vehicle-mounted low-voltage storage battery of the electric vehicle is lower than a preset threshold value;
and when the electric vehicle needs to be maintained or the voltage of the vehicle-mounted low-voltage storage battery is lower than the preset threshold value, starting the standby DC-DC to convert the high-voltage power provided by the high-voltage power battery into low-voltage power through the standby DC-DC, and supplying the low-voltage power to at least one of low-voltage electric equipment and the vehicle-mounted low-voltage storage battery.
Optionally, the detecting whether the electric vehicle needs to be repaired includes:
detecting whether the vehicle-mounted DC-DC of the electric vehicle has a fault; or
Detecting whether one end of a battery manager of the electric vehicle is at a low level.
Optionally, the method further comprises:
when the electric vehicle needs to be maintained, the high-voltage power battery is controlled to be suspended to provide power for the electric vehicle and provide high-voltage electricity for the high-voltage electric equipment.
Optionally, the method further comprises:
and when the voltage of the vehicle-mounted low-voltage storage battery is lower than the preset threshold value, controlling a standby low-voltage storage battery to provide low-voltage electricity for the low-voltage electric equipment and the battery manager.
As a further aspect of the present invention, an electric vehicle is provided, which includes a power supply device, wherein the power supply device is the above power supply device provided by the present invention.
When the electric vehicle needs to be maintained, the battery manager starts the standby DC-DC to convert high-voltage power provided by the high-voltage power battery into low-voltage power, so that low-voltage power supply can be performed on low-voltage electric equipment of the electric vehicle during maintenance. After the standby DC-DC, the battery manager and the standby storage battery are arranged in the power supply device, when a vehicle is maintained, even if the voltage of the vehicle-mounted low-voltage storage battery is insufficient (namely, the voltage of the vehicle-mounted low-voltage storage battery is lower than a preset threshold), the low-voltage power supply can be still carried out on low-voltage electric equipment of the electric vehicle under the condition that the vehicle-mounted low-voltage storage battery is not replaced, and the normal operation of maintenance is guaranteed.
In addition, when the voltage of the vehicle-mounted low-voltage storage battery is lower than the preset threshold value in the running process of the electric vehicle, the battery manager can also start the standby DC-DC, convert the high-voltage power provided by the high-voltage power battery 100 into low-voltage power, and continue to supply low-voltage power to low-voltage electric equipment of the electric vehicle, so as to prevent the low-voltage power of the electric vehicle from being suddenly cut off, and further ensure the normal running of the electric vehicle.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of a power supply device according to a first embodiment of the present invention;
fig. 2 is a schematic view of a power supply device according to a second embodiment of the present invention;
fig. 3 is a schematic view of a power supply device according to a third embodiment of the present invention;
fig. 4 is a schematic view of a power supply device according to a fourth embodiment of the present invention;
fig. 5 is a schematic flow chart of power supply by the power supply device provided by the present invention.
Fig. 6 is a schematic diagram of a battery pack in a power supply device provided by the invention.
Description of the reference numerals
10 power button 20 start button
100 high-voltage power battery 200 standby DC-DC
300 vehicle-mounted low-voltage storage battery 400 battery manager
500 low-voltage electric equipment 600 vehicle-mounted DC-DC
700 standby low-voltage battery 800 instrument
900 vehicle body control module 1000 battery pack
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As one aspect of the present invention, there is provided a power supply device, wherein the power supply device is disposed on an electric vehicle, and as shown in fig. 1, the power supply device includes: high-voltage power battery 100, backup DC-DC200, on-board low-voltage battery 300, and battery manager 400.
Specifically, the high voltage power battery 100 is used to provide power for the electric vehicle and provide high voltage electricity for high voltage electric devices. The backup DC-DC200 is connected in parallel with the high voltage power battery 100 for converting the high voltage power provided by the high voltage power battery 100 into a low voltage power (e.g., 24V). In-vehicle low-voltage battery 300 is connected in parallel to low-voltage electric device 500 and backup DC-DC200, and is used to supply low voltage to low-voltage electric device 500 and battery manager 400. The battery manager 400 is used to start the standby DC-DC200 when the electric vehicle needs maintenance or the voltage of the on-board low-voltage battery 300 is lower than a preset threshold.
When the electric vehicle needs to be maintained, the battery manager 400 starts the standby DC-DC200 to convert the high voltage provided by the high voltage power battery 100 into low voltage power, so that the low voltage power supply of the low voltage electric equipment 500 of the electric vehicle can be realized during maintenance.
As shown in fig. 2, after the backup DC-DC200 and the battery manager 400 are provided in the power supply apparatus, even if the voltage of the on-vehicle low-voltage battery 300 is low (that is, the voltage of the on-vehicle low-voltage battery 300 is lower than the preset threshold value) when the vehicle is serviced, the low-voltage power supply to the low-voltage electric device 500 of the electric vehicle can be performed without replacing the on-vehicle low-voltage battery 300, thereby ensuring the normal performance of the servicing.
In addition, when the voltage of the vehicle-mounted low-voltage battery 300 is lower than the preset threshold value during the running process of the electric vehicle, the battery manager 400 may also start the standby DC-DC200, convert the high-voltage power provided by the high-voltage power battery 100 into low-voltage power, and continue to supply low-voltage power to the low-voltage electric equipment 500 of the electric vehicle, so as to prevent the low-voltage power of the electric vehicle from being suddenly cut off, thereby ensuring the normal running of the electric vehicle.
Preferably, the power supply device further comprises an onboard DC-DC600 and a manual switch T1.
The on-vehicle DC-DC600 is connected in parallel to the high-voltage power battery 100, the on-vehicle low-voltage battery 300, and the low-voltage electric device 500, and is configured to convert the high-voltage power supplied from the high-voltage power battery 100 into low-voltage power and supply the low-voltage power to at least one of the low-voltage electric device 500 and the on-vehicle low-voltage battery 300.
The manual switch T1 is connected in series between the low voltage positive output terminal of the standby DC-DC200 and the battery manager 400, and when the manual switch T1 is closed, the battery manager 400 can be triggered to detect the state of the manual switch T1.
In the present invention, the state of the manual switch T1 is changed by the driver of the electric vehicle. When the vehicle-mounted DC-DC600 fails or the voltage of the vehicle-mounted low-voltage battery 300 falls below the preset threshold, the driver may close the manual switch T1.
The battery manager 400 is configured to, upon detecting that the state of the manual switch T1 is closed, start the backup DC-DC200 to convert the high-voltage power supplied from the high-voltage power battery 100 into low-voltage power by the backup DC-DC and supply at least one of the low-voltage electric devices 500 and the on-vehicle low-voltage storage battery 300.
When the electric vehicle is not in a maintenance state or the on-vehicle low-voltage battery 300 is not short of power, the user may turn on the manual switch T1. When the electric vehicle is in a running state, the high voltage power supplied from the high voltage power battery 100 may be converted into a low voltage power by the on-vehicle DC-DC600 and supplied to at least one of the low voltage electric devices 500 and the on-vehicle low voltage storage battery 500.
In order to ensure the safety of the maintenance work, it is preferable that the power supply device further includes a maintenance switch T2, as shown in fig. 1, the maintenance switch T2 is connected in series between the high-voltage positive output terminal of the high-voltage power battery 100 and the high-voltage electric equipment positive terminal. When the maintenance switch T2 is closed, the battery manager 400 can be triggered to detect the state of the maintenance switch T2. In the present invention, the maintenance switch T2 may be operated by a maintenance person in a normally closed state of the maintenance switch T2 switch, that is, the maintenance switch T2 may be turned off when the maintenance person is in maintenance of the electric vehicle.
Accordingly, the battery manager 400 is further configured to control the high-voltage power battery 100 to suspend power supply to the electric vehicle and supply high-voltage power to the high-voltage electric equipment when detecting that the state of the maintenance switch T2 is off.
Preferably, as shown in fig. 2, the power supply device further includes a backup low-voltage battery 700 and a backup low-voltage battery switch T3. Specifically, backup low voltage battery 700 is connected in parallel with backup DC-DC200 for providing low voltage power to low voltage powered device 500 and battery manager 400. A backup low-voltage battery switch T3 is connected in series between the low-voltage positive output of backup low-voltage battery 700 and battery manager 400.
Accordingly, the battery manager 400 is also used to control the backup low voltage battery switch T3 to remain normally closed, and to control the backup low voltage battery T3 switch to open when the onboard DC-DC600 is operating normally.
The backup low-voltage battery T3 is not in operation when the on-board DC-DC600 can operate normally. When onboard low-voltage battery 300 is undercharged, backup low-voltage battery 700 may be utilized to provide power to battery manager 400, such that battery manager 400 is operational and can ensure that backup DC-DC200 may operate properly.
Specifically, in the case where the vehicle-mounted low-voltage battery 300 has run out of power, if the user cannot start the vehicle, the manual switch T1 may be pressed, and since the backup low-voltage battery switch T3 is a normally closed switch, the backup low-voltage battery 700 is connected to the circuit, and the backup low-voltage battery 700 supplies low-voltage power to the entire vehicle, so that the vehicle starts normally. When the onboard DC-DC600 is operating normally, the battery manager 400 may control the standby low-voltage battery switch T3 to open, and the standby low-voltage battery 700 is removed from power.
When the battery manager 400 detects that the voltage of the standby low-voltage battery 700 is lower than the preset threshold, if the electric vehicle is not in the maintenance state, that is, the maintenance switch T2 is in the closed state, the battery manager 400 controls the vehicle-mounted DC-DC600 to operate, and simultaneously controls the standby low-voltage battery switch T3 to be closed, and the vehicle-mounted DC-DC600 supplies power to the standby low-voltage battery 700. When the electric vehicle is in a maintenance state, the battery manager 400 controls the standby DC-DC200 to work, and simultaneously controls the standby low-voltage storage battery switch T3 to be closed, and the standby DC-DC200 supplies power to the vehicle-mounted low-voltage storage battery 300 and the standby low-voltage storage battery 700 at the same time.
In order to improve the safety during maintenance, it is preferable that the power supply device further includes a start switch T4 and a power supply switch T5, as shown in fig. 3.
The start switch T4 is connected in series between the battery manager 400 and the ground, and when the start switch T4 is closed, one side of the battery manager 400 is at a low level.
Supply switch T5 is connected in series between battery manager 400 and the low voltage positive output of on-board low voltage battery 300, and when supply switch T5 is closed, on-board low voltage battery 300 provides low voltage power to backup DC-DC200 and battery manager 400.
It will be readily appreciated that the low level is provided by the ground terminal. The start switch T4 may be operated by a service person to close.
When the electric vehicle is in a maintenance state, the power supply switch T5 is closed, and the high-voltage power battery 100 does not output high-voltage electricity any more, so that the problem that a maintenance worker gets an electric shock accidentally can be prevented during maintenance. When the electric vehicle is in a driving state, if the vehicle-mounted DC-DC600 fails, a user can press a T5 switch to start the standby DC-DC200, so that the accident of the whole vehicle caused by abnormal low-voltage power supply is avoided.
Preferably, the power supply apparatus may further include a body control module 900, and the body control module 900 is electrically connected to the battery manager 400, and is configured to transmit discharge and charge start information and detect a voltage of the on-vehicle low-voltage storage battery.
In the present invention, as shown in fig. 6, a module composed of a high-voltage power battery 100, a backup DC-DC200, and a backup low-voltage secondary battery 700 may be referred to as a battery pack 1000. The battery pack 1000 comprises a battery pack high-voltage output negative electrode, a battery pack high-voltage output positive electrode, an internal contactor T, a negative electrode contactor connected in series between the battery pack high-voltage output negative electrode and the high-voltage output negative electrode of the high-voltage power battery 100, and a positive electrode contactor connected in series between the battery pack high-voltage output positive electrode and the internal contactor T. The battery pack 1000 further comprises a low-voltage output anode and a low-voltage output cathode, the low-voltage output cathode of the battery pack 1000 is an input cathode of the standby DC-DC, and the low-voltage output anode of the battery pack is an input anode of the standby DC-DC.
When the vehicle is in a maintenance state, if the standby power supply function is started, the positive contactor and the negative contactor are disconnected, and the internal contactor T is closed. The advantage of doing so is when can making stand-by power supply work, and battery package high voltage output positive pole and high voltage output negative pole are uncharged, and the security is high, takes place the problem of electrocuteeing beyond the personnel when can effectively preventing to maintain. When the vehicle is in a driving state, if the standby power supply scheme is started when the vehicle-mounted DC-DC fails, the positive contactor, the negative contactor and the internal contactor T are kept closed, and the whole vehicle is prevented from causing accidents due to low-voltage power supply abnormity.
Note that communication between standby DC-DC200 and battery manager 400 is via a CAN bus. For convenience of control, the power supply apparatus may further include an activation button 20 for controlling the activation switch T4 and a power button 10 for controlling the power switch T5.
The following describes the operation of the power supply device provided by the present invention with reference to fig. 4 and 5:
(1) normally, the start button 20 and the power button 10 are not pressed, the pin C1-1 and the pin C1-2 of the power switch T5 are not conductive, and the pin D1-1 and the pin D1-2 of the start switch T4 are not conductive.
(2) After the power button 10 is pressed, the power switch T5 is in a locked state, the pin C1-1 and the pin C1-2 are conducted, 24V normal voltage provided by the vehicle-mounted low-voltage storage battery 300 is connected into a low-voltage power supply loop, 24V low-voltage power is supplied, and a battery manager and the standby DC-DC are powered on to work.
(3) When the start switch is pressed, the start button T4 is in a locked state, and the pin D1-1 and the pin D1-2 of the start switch are turned on, and the pin B25 of the battery manager 400 becomes a low level.
(4) After the battery manager 400 is powered on, if it is detected that the pin B25 is at a low level, it is first determined whether the vehicle is in a charging or discharging process, or whether a dc charging relay, an ac charging relay, or a start command is received, and if none of the states are in the above state, a standby power request is responded.
(5) After entering the standby power supply request, whether an intelligent charging process is entered or not is judged, if the intelligent charging process is entered, the intelligent charging process is exited first, and then the standby power supply process is entered. And if the intelligent charging process is not started, directly starting the standby power supply process.
(6) After entering the standby power supply flow, the battery manager 400 sends a standby power supply function starting request message to the standby DC-DC200, the standby DC-DC200 starts voltage conversion work after receiving the message, and sends a standby power supply function starting message, after receiving the message, the battery manager 400 sends a standby power supply function starting message, and the meter 800 displays "standby power supply function starting" after receiving the message.
(7) When the user presses the start button 20 again, the start switch T4 is reset, the pin D1-1 and the pin D1-2 are disconnected, the battery manager 400 detects that the pin B25 is at a high level, the battery manager 400 sends a standby power function stop request message to the standby DC-DC200, the standby DC-DC200 receives the message and sends a standby DC-DC status message (standby power function stop) to the battery manager 400, the battery manager 400 receives the standby DC-DC status message information and sends a standby power function stop status message, and the meter receives the information and displays "please reset the power button".
(8) When the user presses power button 10, power switch T5 resets, pin C1-1 and pin C1-2 disconnect, battery manager 400 disconnects from the standby DC extra power circuit, and power is removed.
(9) When a user presses the start switch 20 and the battery manager 400 is powered on, if the vehicle does not meet the start conditions of the standby power supply function, including a power battery fault and a serious leakage fault, the battery manager 400 sends a standby power supply function prohibition message, and the meter displays "battery system fault and please reset the power supply button" after receiving the message.
(10) In the standby power supply process, if the high-voltage power battery 100 fails and the battery SOC is low, the battery manager 400 sends a standby power supply function stop request message to the standby DC-DC200, the standby DC-DC200 receives the message and then sends a standby DC-DC status message (standby power supply function stop) to the battery manager 400, the battery manager 400 receives the standby DC-DC status message information and then sends a standby power supply function stop status message, and the meter 800 receives the information and displays a "please reset power supply button".
(11) In the standby power supply process, if the standby DC-DC fails, the standby DC-DC sends a standby DC-DC status message (standby power supply function stop) to the battery manager, after receiving the status message information of the standby DC-DC, the battery manager 400 disconnects the voltage division contactor, sends a standby power supply function stop status message, and after receiving the information, the instrument 800 displays "please reset the power supply button".
As another aspect of the present invention, there is provided a power supply method, wherein the power supply method is applied to an electric vehicle, the method including:
s100, detecting whether the electric vehicle needs to be maintained or whether the voltage of a vehicle-mounted low-voltage storage battery of the electric vehicle is lower than a preset threshold value;
s200, when the electric vehicle needs to be maintained or the voltage of the vehicle-mounted low-voltage storage battery is lower than the preset threshold value, starting the standby DC-DC to convert the high-voltage power provided by the high-voltage power battery into low-voltage power through the standby low-voltage storage battery, and supplying the low-voltage power to at least one of low-voltage electric equipment and the vehicle-mounted low-voltage storage battery.
Specifically, the step S100 includes two cases, one is to detect whether the electric vehicle needs to be maintained, and the other is to detect whether the voltage of the on-board low-voltage battery of the electric vehicle is lower than a preset threshold.
Specifically, the detecting whether the electric vehicle needs to be maintained includes two situations, including:
s110, detecting whether the vehicle-mounted DC-DC of the electric vehicle has a fault; or
And S120, detecting whether one end of a battery manager of the electric vehicle is at a low level.
Preferably, the method further comprises:
s300, when the electric vehicle needs to be maintained, the high-voltage power battery is controlled to be suspended to provide power for the electric vehicle and provide high-voltage electricity for the high-voltage electric equipment.
Preferably, the method further comprises:
s400, when the voltage of the vehicle-mounted low-voltage storage battery is lower than the preset threshold value, controlling a standby low-voltage storage battery to provide low-voltage electricity for the low-voltage electric equipment and the battery manager.
As still another aspect of the present invention, there is provided an electric vehicle including the above power supply apparatus provided by the present invention.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention 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 invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (9)
1. A power supply device, which is provided in an electric vehicle, the power supply device comprising: the system comprises a high-voltage power battery, a standby DC-DC, a vehicle-mounted low-voltage storage battery and a battery manager;
the high-voltage power battery is used for providing power for the electric vehicle and providing high voltage electricity for high-voltage electric equipment;
the standby DC-DC is connected with the high-voltage power battery in parallel and is used for converting high-voltage power provided by the high-voltage power battery into low-voltage power;
the vehicle-mounted low-voltage storage battery is connected with low-voltage electric equipment and the standby DC-DC in parallel and is used for providing low voltage electricity for the low-voltage electric equipment and the battery manager;
the battery manager is used for starting the standby DC-DC when the electric vehicle needs to be maintained or the voltage of the vehicle-mounted low-voltage storage battery is lower than a preset threshold value;
wherein the power supply device further includes: an onboard DC-DC and manual switch;
the vehicle-mounted DC-DC is connected with the high-voltage power battery, the vehicle-mounted low-voltage storage battery and the low-voltage electric equipment in parallel, and is used for converting high-voltage electricity provided by the high-voltage power battery into low-voltage electricity and supplying the low-voltage electricity to at least one of the low-voltage electric equipment and the vehicle-mounted low-voltage storage battery;
the manual switch is connected in series between the low-voltage positive output end of the standby DC-DC and the battery manager, and when the vehicle-mounted DC-DC fails or the voltage of the vehicle-mounted low-voltage storage battery is lower than the preset threshold value, the manual switch is closed, so that the battery manager can be triggered to detect the state of the manual switch;
the battery manager is further used for starting the standby DC-DC when the state of the manual switch is detected to be closed, converting high-voltage power provided by the high-voltage power battery into low-voltage power through the standby DC-DC, and supplying the low-voltage power to at least one of the low-voltage electric equipment and the vehicle-mounted low-voltage storage battery.
2. The power supply device according to claim 1, further comprising a maintenance switch connected in series between the high-voltage positive output terminal of the high-voltage power battery and the positive terminal of the high-voltage electric equipment, wherein when the maintenance switch is closed, the battery manager is triggered to detect the state of the maintenance switch;
the battery manager is also used for controlling the high-voltage power battery to suspend providing power for the electric vehicle and providing high-voltage electricity for the high-voltage electric equipment when the state of the maintenance switch is detected to be disconnected.
3. The power supply device according to claim 1 or 2, characterized by further comprising: a standby low-voltage storage battery and a standby low-voltage storage battery switch,
the standby low-voltage storage battery is connected with the standby DC-DC in parallel and used for providing low-voltage electricity for the low-voltage electric equipment and the battery manager;
the standby low-voltage storage battery switch is connected between the low-voltage positive electrode output end of the standby low-voltage storage battery and the battery manager in series;
the battery manager is also used for controlling the standby low-voltage storage battery switch to keep a normally-closed state and controlling the standby low-voltage storage battery switch to be switched off when the vehicle-mounted DC-DC operates normally.
4. The power supply device according to claim 1, characterized by further comprising: a starting switch and a power supply switch;
the starting switch is connected between the battery manager and a grounding terminal in series, and when the starting switch is closed, one end of the battery manager is in a low level;
the power supply switch is connected in series between the battery manager and the low-voltage positive output end of the vehicle-mounted low-voltage storage battery, and when the power supply switch is switched off, the vehicle-mounted low-voltage storage battery provides low voltage electricity for the standby DC-DC and the battery manager;
the battery manager is also used for starting the standby DC-DC when detecting a low level, converting the high-voltage power provided by the high-voltage power battery into low-voltage power through the standby DC-DC, and supplying the low-voltage power to at least one of the low-voltage electric equipment and the vehicle-mounted low-voltage storage battery.
5. A power supply method is characterized by being applied to an electric vehicle, and the method comprises the following steps:
detecting whether the electric vehicle needs to be maintained or whether the voltage of a vehicle-mounted low-voltage storage battery of the electric vehicle is lower than a preset threshold value;
when the electric vehicle needs to be maintained or the voltage of the vehicle-mounted low-voltage storage battery is lower than the preset threshold value, starting a standby DC-DC (direct current-direct current), converting high-voltage power provided by a high-voltage power battery into low-voltage power through the standby DC-DC, and supplying the low-voltage power to at least one of low-voltage electric equipment and the vehicle-mounted low-voltage storage battery;
the method further comprises the following steps: and detecting the state of a manual switch, and when detecting that the state of the manual switch is closed, starting the standby DC-DC to convert high-voltage power provided by the high-voltage power battery into low-voltage power through the standby DC-DC and supply the low-voltage power to at least one of the low-voltage electric equipment and the vehicle-mounted low-voltage storage battery.
6. The method of claim 5, wherein the detecting whether the electric vehicle requires servicing comprises:
detecting whether the vehicle-mounted DC-DC of the electric vehicle has a fault; or
Detecting whether one end of a battery manager of the electric vehicle is at a low level.
7. The method of claim 5, further comprising:
when the electric vehicle needs to be maintained, the high-voltage power battery is controlled to be suspended to provide power for the electric vehicle and provide high-voltage electricity for high-voltage electric equipment.
8. The method of claim 5, further comprising:
and when the voltage of the vehicle-mounted low-voltage storage battery is lower than the preset threshold value, controlling a standby low-voltage storage battery to provide low-voltage electricity for the low-voltage electric equipment and the battery manager.
9. An electric vehicle comprising a power supply device, characterized in that the power supply device is the power supply device of any one of claims 1 to 4.
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| CN201610380178.2A CN107444123B (en) | 2016-05-31 | 2016-05-31 | Power supply device, power supply method and electric vehicle |
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| CN201610380178.2A CN107444123B (en) | 2016-05-31 | 2016-05-31 | Power supply device, power supply method and electric vehicle |
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| CN111347878B (en) * | 2018-12-21 | 2021-09-21 | 比亚迪股份有限公司 | Vehicle starting control method and device |
| CN111439125A (en) * | 2018-12-28 | 2020-07-24 | 比亚迪股份有限公司 | Electric automobile, motor controller and low-voltage load power supply circuit and method thereof |
| CN111376722A (en) * | 2018-12-29 | 2020-07-07 | 观致汽车有限公司 | Charging system and charging method for use in vehicle |
| CN110103850B (en) * | 2019-05-07 | 2021-11-05 | 桑顿新能源科技(长沙)有限公司 | Battery system for preventing vehicle-mounted low-voltage power supply from power shortage |
| CN110450675B (en) * | 2019-07-25 | 2023-08-22 | 桑顿新能源科技(长沙)有限公司 | Power battery system, control method and electric automobile |
| CN111641247B (en) * | 2020-05-15 | 2022-03-08 | 华为数字能源技术有限公司 | Charging circuit of vehicle-mounted charger, vehicle-mounted charger and charging control method |
| CN112092626B (en) * | 2020-07-31 | 2022-03-25 | 东风商用车有限公司 | Remote monitoring protection method and system for low-voltage storage battery of electric vehicle |
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