CN114312373B - DC charging system and method - Google Patents
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- CN114312373B CN114312373B CN202011063011.6A CN202011063011A CN114312373B CN 114312373 B CN114312373 B CN 114312373B CN 202011063011 A CN202011063011 A CN 202011063011A CN 114312373 B CN114312373 B CN 114312373B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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Abstract
The present disclosure relates to a direct current charging system and method, the direct current charging system comprising: the vehicle comprises a BMC, a DCDC, a power battery and a storage battery, wherein the DC charging device is used for providing a first low-voltage direct current to the BMC and the DCDC and providing a high-voltage direct current to the DCDC and the power battery; the BMC is used for carrying out pre-charging after being powered and sending a working instruction to the DCDC when the pre-charging is determined to be completed; the DCDC is used for converting the high-voltage direct current into the second low-voltage direct current to charge the storage battery after being powered by the first low-voltage direct current if the working instruction is received. Like this, can charge for this battery when carrying out high-pressure charging to this power battery to can effectively promote vehicle user experience.
Description
Technical Field
The present disclosure relates to the field of vehicle technology, and in particular, to a direct current charging system and method.
Background
In a vehicle, a storage battery (also called a small battery) is used for supplying power to low-voltage electric equipment of the whole vehicle, the vehicle cannot be started normally under the condition of power supply of the storage battery, and a common processing method is that the storage battery in the vehicle is powered by an external storage battery (for example, the storage battery in other vehicles or a mobile charging device) to start the vehicle, and after the vehicle is started, a DCDC module in the vehicle converts high-voltage electricity in a power battery into low-voltage direct current to charge the storage battery.
However, in the process of taking power for the vehicle through the external storage battery, the situation of taking wrong lines often occurs, other misoperation can occur to damage the vehicle, and even the storage battery fires due to taking wrong lines in the process of taking power, so that certain personal injury is caused.
Disclosure of Invention
It is an object of the present disclosure to provide a direct current charging system and method.
To achieve the above object, in a first aspect of the present disclosure, there is provided a direct current charging system including: the vehicle comprises a BMC, a DCDC, a power battery and a storage battery, wherein the DC charging device is respectively connected with the BMC, the DCDC and the power battery, the BMC is connected with the DCDC, and the DCDC is also connected with the storage battery; wherein,,
the direct current charging device is used for providing a first low-voltage direct current to the BMC and the DCDC and providing a high-voltage direct current to the DCDC and the power battery;
the BMC is used for precharging after being powered, and sending a working instruction to the DCDC when the precharge is determined to be completed;
and the DCDC is used for converting the high-voltage direct current into the second low-voltage direct current to charge the storage battery after being powered by the first low-voltage direct current if the working instruction is received.
Optionally, the direct current charging device comprises a low voltage direct current output end and a high voltage direct current output end, the low voltage direct current output end is used for connecting the power supply end of the BMC and the power supply end of the DCDC, the high voltage direct current output end is used for connecting the input end of the power battery and the high voltage input end of the DCDC,
the direct current charging device is used for providing the first low-voltage direct current to the power supply end of the BMC and the power supply end of the DCDC through the low-voltage direct current output end, and providing the high-voltage direct current to the high-voltage input end of the DCDC and the input end of the power battery through the high-voltage direct current output end.
Optionally, the power supply terminal of the BMC includes a constant power supply terminal and a very power supply terminal, and the low voltage dc output terminal is connected to the constant power supply terminal and the very power supply terminal.
Optionally, a first diode is arranged between the low-voltage direct current output end and the normal electric power supply end, an anode of the first diode is connected with the low-voltage direct current output end, a cathode of the first diode is connected with the normal electric power supply end, a second diode is arranged between the low-voltage direct current output end and the normal electric power supply end, an anode of the second diode is connected with the low-voltage direct current output end, and a cathode of the second diode is connected with the normal electric power supply end.
Optionally, the output end of the storage battery is connected with the unloading relay and then is connected with the very electric power supply end through a third diode, the anode of the third diode is connected with the unloading relay, the cathode of the third diode is connected with the very electric power supply end, the output end of the storage battery is connected with the very electric power supply end through a fourth diode, the anode of the fourth diode is connected with the output end of the storage battery, and the cathode of the fourth diode is connected with the very electric power supply end.
Optionally, the low-voltage direct current output end is connected with the power supply end of the DCDC through a fifth diode, an anode of the fifth diode is connected with the low-voltage direct current output end, and a cathode of the fifth diode is connected with the power supply end of the DCDC.
Optionally, the output end of the storage battery is connected with the power supply end of the DCDC through a sixth diode, the anode of the sixth diode is connected with the output end of the storage battery, the cathode of the sixth diode is connected with the power supply end of the DCDC, and the cathode of the fifth diode is connected with the cathode of the sixth diode.
Optionally, the power supply end of DCDC includes first low voltage power supply end and second low voltage power supply end, the output of battery through seventh diode with first low voltage power supply end is connected, the output of battery through eighth diode with the second power supply end is connected, the positive pole of seventh diode with the positive pole of eighth diode all with the output of battery is connected, the negative pole of seventh diode with first low voltage power supply end is connected, the negative pole of eighth diode with second low voltage power supply end is connected.
Optionally, the constant electricity power supply end of BMC includes first constant electricity power supply end and second constant electricity power supply end, the output of battery through ninth diode with first constant electricity power supply end is connected, the output of battery through twelfth diode with second constant electricity power supply end is connected, the positive pole of ninth diode with the positive pole of tenth diode all with the output of battery is connected, the negative pole of ninth diode with first constant electricity power supply end is connected, the negative pole of twelfth diode with second constant electricity power supply end is connected.
In a second aspect of the present disclosure, there is provided a direct current charging method applied to a direct current charging system, the direct current charging system including: the vehicle comprises a BMC, a DCDC, a power battery and a storage battery, wherein the DC charging device is respectively connected with the BMC, the DCDC and the power battery, the BMC is connected with the DCDC, and the DCDC is also connected with the storage battery; the method comprises the following steps:
providing a first low-voltage direct current to the BMC and the DCDC through the direct current charging device, and providing a high-voltage direct current to the DCDC and the power battery;
the BMC performs pre-charging after being powered, and sends a working instruction to the DCDC when the pre-charging is determined to be completed;
after the DCDC is powered by the first low-voltage direct current, if the working instruction is received, the DCDC converts the high-voltage direct current into the second low-voltage direct current, and the storage battery is charged.
According to the technical scheme, the direct current charging device is used for providing first low-voltage direct current for the BMC and the DCDC and providing high-voltage direct current for the DCDC and the power battery; the BMC performs pre-charging after being powered, and sends a working instruction to the DCDC when the pre-charging is determined to be completed; after the DCDC is powered by the first low-voltage direct current, if the working instruction is received, the high-voltage direct current is converted into the second low-voltage direct current to charge the storage battery, so that the direct current charging device can provide the first low-voltage direct current for the BMC and the DCDC and provide the high-voltage direct current for the power battery and the DCDC, the DCDC can convert the high-voltage direct current into the second low-voltage direct current to charge the storage battery after power is supplied, the power battery can be charged at high voltage, and meanwhile, the storage battery is charged, and the situation that the external storage battery is used for charging the storage battery in a vehicle under the condition of feeding the storage battery can be effectively avoided, so that the phenomenon of damaging the vehicle and personal injury can be avoided, and the user experience of the vehicle can be effectively improved.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a block diagram of a DC charging system shown in an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic circuit diagram of a DC charging system according to the embodiment shown in FIG. 1;
FIG. 3 is a schematic circuit diagram of another DC charging system according to the embodiment shown in FIG. 1;
FIG. 4 is a schematic diagram of a connector interface shown according to the embodiment shown in FIG. 2;
fig. 5 is a flowchart illustrating a direct current charging method according to another exemplary embodiment of the present disclosure.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Before describing the specific embodiments of the present disclosure in detail, the following description is first made on a specific application scenario of the present disclosure, where the present disclosure may be applied to a scenario of battery feeding in a vehicle, where the vehicle may be a pure electric vehicle or a hybrid vehicle, and generally, in a case of battery feeding in a vehicle, the vehicle cannot be started normally, and in related art, for a case of battery feeding, a generally conventional processing method is to tap a battery in a vehicle through an external battery (for example, a battery in another vehicle or a mobile charger), that is, connect an output end of the battery to another external battery, so that the external battery replaces the battery to supply power to low-voltage electric equipment in the vehicle, to start the vehicle, and after the vehicle starts, a DCDC module in the vehicle converts high-voltage electricity in the power battery into low-voltage direct current to charge the battery. However, because the number of the wire harnesses in the vehicle is large, the situation of wrong wire connection often occurs in the process of taking electricity for the vehicle through the external storage battery, or other misoperation occurs to damage the vehicle, and even the storage battery fires due to wrong wire connection in the process of taking electricity, so that certain personal injury is caused.
In order to solve the above technical problems, the present disclosure provides a dc charging system and method, where the dc charging system includes: a Direct Current charging device and a vehicle, the vehicle comprising a BMC (Battery Management Controller ), a DCDC (Direct Current-Direct Currentconverter, direct voltage converter), a power battery and a storage battery, the Direct Current charging device being connected to the BMC, the DCDC and the power battery, respectively, the BMC being connected to the DCDC, the DCDC being further connected to the storage battery; the direct current charging device is used for providing a first low-voltage direct current to the BMC and the DCDC and providing a high-voltage direct current to the DCDC and the power battery; the BMC is used for carrying out pre-charging after being powered and sending a working instruction to the DCDC when the pre-charging is determined to be completed; the DCDC is used for converting the high-voltage direct current into the second low-voltage direct current to charge the storage battery after being powered by the first low-voltage direct current if the working instruction is received. Therefore, the direct current charging device can provide a first low-voltage direct current for the BMC and the DCDC and a high-voltage direct current for the power battery and the DCDC, so that the DCDC can convert the high-voltage direct current into a second low-voltage direct current after power is supplied to charge the storage battery, the storage battery can be charged while the power battery is charged at high voltage, the phenomena of vehicle damage and personal injury caused by using an external storage battery under the condition of battery feeding can be effectively avoided, and the user experience of the vehicle can be effectively improved.
FIG. 1 is a block diagram of a DC charging system shown in an exemplary embodiment of the present disclosure; as shown in fig. 1, the dc charging system includes: a direct current charging device 101 and a vehicle 102, the vehicle 102 comprising a BMC1021, a DCDC1022, a power battery 1023 and a storage battery 1024, the direct current charging device 101 being connected to the BMC1021, the DCDC1022 and the power battery 1023, respectively, the BMC1021 being connected to the DCDC1022, the DCDC1022 being further connected to the storage battery 1024; wherein,,
the dc charging device 101 is configured to provide a first low-voltage dc power to the BMC1021 and the DCDC1022, and provide a high-voltage dc power to the DCDC1022 and the power battery 1023;
the BMC1021 is used for precharging after being supplied with power, and sending an operating instruction to the DCDC1022 when the precharge is determined to be completed;
the DCDC1022 is configured to convert the high-voltage dc into the second low-voltage dc to charge the battery after being powered by the first low-voltage dc if the operation command is received.
Wherein the DC charging device 101 comprises a low voltage DC output terminal DL for connecting the power supply terminal of the BMC and the power supply terminal of the DCDC, and a high voltage DC output terminal DH for connecting the input terminal of the power battery and the high voltage input terminal of the DCDC,
the dc charging device 101 is configured to provide the first low-voltage dc to the power supply terminal of the BMC and the power supply terminal of the DCDC through the low-voltage dc output terminal DL, and provide the high-voltage dc to the high-voltage input terminal of the DCDC and the input terminal of the power battery through the high-voltage dc output terminal DH.
The first low-voltage dc power may be the same as the second low-voltage dc power (e.g., 12V dc power), or may be different from the second low-voltage dc power, e.g., 12V dc power, and 24V dc power. The pre-charging is to charge the capacitor on the direct current bus of the related high voltage module with small current before the high voltage on the vehicle so as to avoid burning out the circuit by directly accessing the high voltage, and the pre-charging can effectively ensure that the power battery and the DCDC can not cause the problem of burning out the vehicle circuit when accessing the high voltage direct current.
In addition, in the vehicle, the DCDC1022 is further connected to the power battery 1023, and when the DCDC1022 receives a working instruction, the DCDC1022 converts the high-voltage direct current output by the charging device into the second low-voltage direct current to charge the storage battery when the vehicle is in a charging process, and after the vehicle is started, if the remaining electric quantity of the power battery 1023 is determined to be greater than or equal to the preset electric quantity threshold value, the DCDC1022 can convert the high-voltage direct current output by the power battery 1023 into the second low-voltage direct current to charge the storage battery.
Like this, in the vehicle charging process, when this direct current charging device can charge for the power battery in the vehicle, through this DCDC1022 for the battery charging in the vehicle, can effectively avoid under the circumstances of battery feed, the damage vehicle that causes and the phenomenon that produces personal injury because of using external battery to can effectively promote vehicle user experience.
FIG. 2 is a schematic circuit diagram of a DC charging system according to the embodiment shown in FIG. 1; referring to fig. 2, the power supply terminals of the BMC1021 include a constant power supply terminal DY1 and an extraordinary power supply terminal DY2, and the low voltage dc output terminal DL is connected to the constant power supply terminal DY1 and the extraordinary power supply terminal DY2.
The BMC1021 includes a very-electric power consumption module (e.g., a high-voltage power collection module, a high-voltage contactor, etc.) and a very-electric power consumption module (e.g., the BMC1021 needs to be supplied with normal electric power as an operating voltage of its own control module), where the very-electric power consumption module is connected to an output terminal OUT of the storage battery through the normal-electric power supply terminal DY1, and the very-electric power consumption module is connected to the output terminal OUT of the storage battery through the very-electric power supply terminal DY2 and an unloading relay (e.g., IG 3), where the normal-electric power supply terminal DY1 is always in a power supply state when the storage battery has electric power for output, and the very-electric power supply terminal DY2 is in a non-power supply state when the unloading relay is in an off state.
Optionally, as shown in fig. 2, a first diode D1 is disposed between the low-voltage dc output end DL and the normal power supply end DY1, an anode of the first diode D1 is connected to the low-voltage dc output end DL, a cathode of the first diode D1 is connected to the normal power supply end DY1, a second diode D2 is disposed between the low-voltage dc output end DL and the normal power supply end DY2, an anode of the second diode D2 is connected to the low-voltage dc output end DL, and a cathode of the second diode D2 is connected to the normal power supply end DY2.
The output end OUT of the storage battery is connected with the unloading relay IG3 and then is connected with the extraordinary power supply end DY2 through a third diode D3, the anode of the third diode D3 is connected with the unloading relay IG3, the cathode of the third diode D3 is connected with the extraordinary power supply end DY2, the output end OUT of the storage battery is connected with the ordinary power supply end DY1 through a fourth diode D4, the anode of the fourth diode D4 is connected with the output end OUT of the storage battery 1024, and the cathode of the fourth diode D4 is connected with the ordinary power supply end DY1.
It should be noted that, the first diode D1 can prevent the current output by the constant power supply terminal DY1 of the BMC1021 from flowing to the low voltage dc output terminal DL of the dc charging device 101 when the low voltage dc output terminal DL of the dc charging device 101 is not electrified; the cathodes of the second diode D2 and the third diode D3 are both connected to the very-electric power supply end DY2, where the second diode D2 can prevent the IG3 electric channeling of the whole vehicle from affecting the stability of the low-voltage dc output end DL of the dc charging device 101, and meanwhile, the second diode D2 can also prevent the current of the very-electric power supply end DY2 of the BMC1021 in the vehicle from flowing to the dc charging device 101 when the low-voltage dc output end DL of the dc charging device 101 is not electrified, so as to play a certain role in protecting the dc charging device 101, and also reduce the loss of the electric quantity of the vehicle in the non-charging process; because other electricity utilization modules are arranged under the IG3 relay, the third diode D3 can prevent the very electricity supply end DY2 of the BMC1021 from supplying electricity to other electricity utilization module blocks under the IG3 relay, and under the suction condition of the IG3 relay, the third diode D3 can prevent the current output by the low-voltage direct current output end DL from flowing to the positive electrode of the storage battery, namely the whole vehicle is always electrified, so that the storage battery can be prevented from being damaged, and the reliability of the direct current charging system can be effectively improved; the fourth diode D4 can prevent the low-voltage dc output terminal DL from supplying power to other normal electric modules in the whole vehicle through the normal electric distribution circuit of the BMC1021, and it should be noted that, in order to reduce the performance requirement for outputting the low-voltage dc by the dc charging device 101, the output current of the low-voltage dc output terminal DL may be kept below 10A, and in the case of the fourth diode D4, the low-voltage dc output terminal DL may be prevented from supplying power to other normal electric power modules in the whole vehicle through the normal electric distribution circuit of the BMC1021, and it should be noted that, when the low-voltage dc output terminal DL supplies power to other normal electric power modules in the whole vehicle through the normal electric distribution circuit of the BMC1021, since the load connected in parallel to the low-voltage dc output terminal DL increases, the output current of the low-voltage dc output terminal DL may be caused to far exceed 10A, and in the case that the output current of the low-voltage dc output terminal DL is configured below 10A, the output current far exceeds 10A may easily damage the dc charging device 101 and the output circuit. Therefore, the fourth diode D4 can prevent the low-voltage dc output DL from supplying power to other normal power supply modules in the whole vehicle through the normal power distribution circuit of the BMC1021, so as to effectively protect the dc charging device 101 and surrounding circuits from being damaged, and thus effectively improve the reliability of the dc charging system.
Optionally, the low-voltage dc output terminal DL is connected to the power supply terminal DY3 of the DCDC1022 through a fifth diode D5, an anode of the fifth diode D5 is connected to the low-voltage dc output terminal DL, and a cathode of the fifth diode D5 is connected to the power supply terminal DY3 of the DCDC 1022.
The fifth diode D5 can effectively prevent the normal electric channeling of the whole vehicle from affecting the stability of the low-voltage dc output end DL of the dc charging device 101 in outputting the first low-voltage dc, and meanwhile, the fifth diode D5 can also prevent the current of the power supply end DY3 of the DCDC1022 from flowing to the dc charging device 101 when the low-voltage dc output end DL of the dc charging device 101 is not provided with the first low-voltage dc and the power supply end DY3 of the DCDC1022 is electrified, thereby affecting the power supply phenomenon of other normal electric power consumption modules.
Optionally, the output terminal OUT of the battery 1024 is connected to the power supply terminal DY3 of the DCDC1022 through a sixth diode D6, the anode of the sixth diode D6 is connected to the output terminal OUT of the battery 1024, the cathode of the sixth diode D6 is connected to the power supply terminal DY3 of the DCDC1022, and the cathode of the fifth diode D5 is connected to the cathode of the sixth diode D6.
The sixth diode D6 is used for preventing the low-voltage dc output terminal DL from supplying power to other normal electric modules of the whole vehicle through the DCDC1022 normal electric power distribution circuit, so that the output current of the low-voltage dc output terminal DL is far more than 10A, and the dc charging device is damaged.
In this way, by arranging the first diode between the low-voltage direct current output end and the normal power supply end of the BMC and arranging the second diode between the low-voltage direct current output end and the normal power supply end of the BMC, the output end of the storage battery 1024 is connected with the normal power supply end through the third diode after being connected with the unloading relay, the output end of the storage battery is connected with the normal power supply end of the BMC through the fourth diode, the low-voltage direct current output end is connected with the power supply end of the DCDC1022 through the fifth diode, and the output end of the storage battery is connected with the power supply end of the DCDC1022 through the sixth diode, so that the stability and reliability of the direct current charging system can be effectively improved, and the experience of a user can be effectively improved.
FIG. 3 is a schematic circuit diagram of another DC charging system according to the embodiment shown in FIG. 1; referring to fig. 3, the power supply terminal DY3 of the DCDC1022 includes a first low voltage power supply terminal DY31 and a second low voltage power supply terminal DY32, the output terminal of the battery 1024 is connected to the first low voltage power supply terminal DY31 through a seventh diode D7, the output terminal OUT of the battery 1024 is connected to the second power supply terminal DY32 through an eighth diode D8, both the anode of the seventh diode D7 and the anode of the eighth diode D8 are connected to the output terminal OUT of the battery 1024, the cathode of the seventh diode D7 is connected to the first low voltage power supply terminal DY31, and the cathode of the eighth diode D8 is connected to the second low voltage power supply terminal DY 32.
It should be noted that, the first low-voltage power supply end DY31 and the second low-voltage power supply end DY32 supply power to the power supply end DY3 of the DCDC1022, when the power supply branch corresponding to the first low-voltage power supply end DY31 fails, the power supply branch of the second low-voltage power supply end DY32 supplies power to the power supply end DY3 of the DCDC1022, so that the reliability of power supply of the power supply end DY3 of the DCDC1022 can be effectively improved, and the reliability of the whole vehicle can be effectively improved.
Optionally, the constant current power supply terminal DY1 of the BMC1021 includes a first constant current power supply terminal DY11 and a second constant current power supply terminal DY12, the output terminal of the storage battery 1024 is connected to the first constant current power supply terminal DY11 through a ninth diode D9, the output terminal OUT of the storage battery 1024 is connected to the second constant current power supply terminal DY12 through a tenth diode D10, the anode of the ninth diode D9 and the anode of the twelfth diode D10 are both connected to the output terminal OUT of the storage battery 1024, the cathode of the ninth diode D9 is connected to the first constant current power supply terminal DY11, and the cathode of the tenth diode D10 is connected to the second constant current power supply terminal DY 12.
The first constant power supply end DY11 and the second constant power supply end DY12 supply power to the constant power supply end DY1 of the BMC1021, and when a power supply branch corresponding to the first constant power supply end DY11 fails, the power supply branch of the second constant power supply end DY12 still supplies power to the constant power supply end DY1 of the BMC1021, so that the reliability of power supply of the constant power supply end DY1 of the BMC1021 can be effectively improved, and the reliability of the whole vehicle can be effectively improved.
The first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5, and the sixth diode D6 may be connected between the dc charging device 101 and the vehicle through a low-voltage connector.
As shown in fig. 4, fig. 4 is a schematic diagram of a connector interface according to the embodiment shown in fig. 2, where interfaces 1-10 of the socket end of the connector are respectively: the No. 1 interface is connected to the low-voltage dc output end DL of the dc charging device 101, the No. 2 interface is connected to the output end OUT of the battery 1024, and is used as a normal electric access end of a connector, the No. 3 interface is connected to the first low-voltage power supply end DY31 of the DCDC1022, the No. 4 interface is connected to the second low-voltage power supply end DY32 of the DCDC1022, the No. 5 interface is connected to the output end OUT of the battery 1024, and is used as a normal electric access end of a connector, the No. 6 interface is connected to the first normal electric power supply end DY11 of the BMC1021, the No. 7 interface is connected to the second normal electric power supply end DY12 of the BMC1021, the No. 8 interface is connected to the unloading relay IG3, and is used as a normal electric access end of a connector, and the No. 9 interface is connected to the normal electric power supply end DY2 of the BMC 1021; the plug end of the connector is provided with a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6, wherein the anode of the first diode D1 is connected between the No. 1 interface, the cathode of the first diode D1 is connected between the No. 6 interface and the No. 7 interface, the cathode of the first diode D1 is also connected with the cathode of the fourth diode D4, the anode of the fourth diode D4 is connected with the No. 5 interface, the anode of the second diode D2 is connected with the No. 9 interface, the anode of the second diode D2 is also connected with the cathode of the third diode D3, the anode of the third diode D3 is connected with the No. 8 interface, the anode of the fifth diode D5 is connected with the No. 1 interface, the cathode of the fifth diode D5 is connected with the No. 3 interface and the No. 4 interface, the cathode of the fifth diode D5 is also connected with the cathode of the sixth diode D6, and the anode of the fifth diode D5 is connected with the No. 6 interface. Therefore, the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6 are connected between the direct current charging device 101 and the vehicle through the connector, so that the connection of the diodes can be realized without changing the hardware circuits of the BMC1021 and the DCDC1022 in the vehicle, and the diode is connected through the connector, so that the later maintenance and treatment are facilitated, the later maintenance efficiency can be improved, and the user experience is improved.
Like this, through first low pressure power supply end DY31 and second low pressure power supply end DY32 for this DCDC1022 power supply, can effectively improve the reliability that this DCDC 1022's power supply end DY3 supplied power, through first ordinary electric power supply end DY11 and second ordinary electric power supply end DY12 for this BMC's ordinary electric power supply end DY1 power supply, can effectively improve the reliability that this BMC's ordinary electric power supply end DY1 supplied power to can effectively promote the reliability of whole vehicle, thereby can effectively promote this direct current charging system's reliability.
Fig. 5 is a flowchart of a direct current charging method shown in another exemplary embodiment of the present disclosure; referring to fig. 5, the direct current charging method may include the steps of:
the direct current charging method is applied to a direct current charging system, and the direct current charging system comprises: the vehicle comprises a BMC, a DCDC, a power battery and a storage battery, wherein the DC charging device is respectively connected with the BMC, the DCDC and the power battery, the BMC is connected with the DCDC, and the DCDC is also connected with the storage battery;
in step 503, after the DCDC is powered by the first low-voltage dc, if the working instruction is received, the DCDC converts the high-voltage dc into the second low-voltage dc to charge the storage battery.
Above-mentioned technical scheme, in the vehicle charging process, when this direct current charging device can charge for the power battery in the vehicle, charges for the battery in the vehicle through this DCDC, can effectively avoid under the circumstances of battery feed, the damage vehicle that causes and the phenomenon that produces personal injury because of using external battery to can effectively promote vehicle user experience.
The specific manner in which the operations are performed in the steps of the method of the above embodiments has been described in detail in relation to the embodiments of the system and will not be described in detail herein.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (10)
1. A direct current charging system, comprising: the vehicle comprises a BMC, a DCDC, a power battery and a storage battery, wherein the DC charging device is respectively connected with the BMC, the DCDC and the power battery, the BMC is connected with the DCDC, and the DCDC is also connected with the storage battery; wherein,,
the direct current charging device is used for providing a first low-voltage direct current to the BMC and the DCDC and providing a high-voltage direct current to the DCDC and the power battery;
the BMC is used for precharging after being powered, and sending a working instruction to the DCDC when the precharge is determined to be completed;
and the DCDC is used for converting the high-voltage direct current into the second low-voltage direct current to charge the storage battery after being powered by the first low-voltage direct current if the working instruction is received.
2. The system of claim 1, wherein the DC charging device comprises a low voltage DC output for connecting a power supply of the BMC and a power supply of the DCDC, and a high voltage DC output for connecting an input of the power battery and a high voltage input of the DCDC,
the direct current charging device is used for providing the first low-voltage direct current to the power supply end of the BMC and the power supply end of the DCDC through the low-voltage direct current output end, and providing the high-voltage direct current to the high-voltage input end of the DCDC and the input end of the power battery through the high-voltage direct current output end.
3. The system of claim 2, wherein the power supply terminals of the BMC include a constant power supply terminal and an extraordinary power supply terminal, and the low voltage dc power output terminal is connected to the constant power supply terminal and the extraordinary power supply terminal.
4. A system according to claim 3, wherein a first diode is arranged between the low voltage dc output and the normally-powered supply, an anode of the first diode is connected to the low voltage dc output, a cathode of the first diode is connected to the normally-powered supply, a second diode is arranged between the low voltage dc output and the normally-powered supply, an anode of the second diode is connected to the low voltage dc output, and a cathode of the second diode is connected to the normally-powered supply.
5. A system according to claim 3, wherein the output of the battery is connected to the off-load relay and then to the very-electric power supply via a third diode, the anode of the third diode is connected to the off-load relay, the cathode of the third diode is connected to the very-electric power supply, the output of the battery is connected to the constant-electric power supply via a fourth diode, the anode of the fourth diode is connected to the output of the battery, and the cathode of the fourth diode is connected to the constant-electric power supply.
6. A system according to claim 3, wherein the low voltage dc output is connected to the supply of DCDC via a fifth diode, the anode of the fifth diode being connected to the low voltage dc output and the cathode of the fifth diode being connected to the supply of DCDC.
7. The apparatus of claim 6, wherein the output of the battery is connected to the supply of the DCDC via a sixth diode, the anode of the sixth diode is connected to the output of the battery, the cathode of the sixth diode is connected to the supply of the DCDC, and the cathode of the fifth diode is connected to the cathode of the sixth diode.
8. The system of claim 3, wherein the power supply terminals of the DCDC include a first low voltage power supply terminal and a second low voltage power supply terminal, the output terminal of the battery is connected to the first low voltage power supply terminal through a seventh diode, the output terminal of the battery is connected to the second power supply terminal through an eighth diode, the anode of the seventh diode and the anode of the eighth diode are both connected to the output terminal of the battery, the cathode of the seventh diode is connected to the first low voltage power supply terminal, and the cathode of the eighth diode is connected to the second low voltage power supply terminal.
9. The system of claim 3, wherein the constant current supply terminal of the BMC comprises a first constant current supply terminal and a second constant current supply terminal, the output terminal of the battery is connected to the first constant current supply terminal through a ninth diode, the output terminal of the battery is connected to the second constant current supply terminal through a twelfth diode, the anode of the ninth diode and the anode of the tenth diode are both connected to the output terminal of the battery, the cathode of the ninth diode is connected to the first constant current supply terminal, and the cathode of the twelfth diode is connected to the second constant current supply terminal.
10. A direct current charging method, characterized by being applied to a direct current charging system, the direct current charging system comprising: the vehicle comprises a BMC, a DCDC, a power battery and a storage battery, wherein the DC charging device is respectively connected with the BMC, the DCDC and the power battery, the BMC is connected with the DCDC, and the DCDC is also connected with the storage battery; the method comprises the following steps:
providing a first low-voltage direct current to the BMC and the DCDC through the direct current charging device, and providing a high-voltage direct current to the DCDC and the power battery;
the BMC performs pre-charging after being powered, and sends a working instruction to the DCDC when the pre-charging is determined to be completed;
after the DCDC is powered by the first low-voltage direct current, if the working instruction is received, the DCDC converts the high-voltage direct current into the second low-voltage direct current, and the storage battery is charged.
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