CN114312373A - DC charging system and method - Google Patents
DC charging system and method Download PDFInfo
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- CN114312373A CN114312373A CN202011063011.6A CN202011063011A CN114312373A CN 114312373 A CN114312373 A CN 114312373A CN 202011063011 A CN202011063011 A CN 202011063011A CN 114312373 A CN114312373 A CN 114312373A
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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 dc charging system and method, the dc 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 for the BMC and the DCDC and providing a high-voltage direct current for the DCDC and the power battery; the BMC is used for carrying out pre-charging after being powered on and sending a working instruction to the DCDC when determining that the pre-charging is finished; the DCDC is used for converting the high-voltage direct current into a second low-voltage direct current to charge the storage battery if the working instruction is received after the DCDC is powered by the first low-voltage direct current. Like this, can be when carrying out high-voltage charging for this power battery, charge for this battery to can effectively promote vehicle user experience.
Description
Technical Field
The present disclosure relates to the field of vehicle technologies, and in particular, to a dc charging system and method.
Background
In a vehicle, a storage battery (also called a small battery) generally supplies power to low-voltage power utilization equipment of the whole vehicle, and in the case of battery power supply, the vehicle cannot be started normally.
However, in the process of charging the vehicle through the external storage battery, the wrong wiring often occurs, other misoperation can also occur to damage the vehicle, and even the storage battery is on fire due to the wrong wiring in the charging process to cause certain personal injury.
Disclosure of Invention
It is an object of the present disclosure to provide a dc charging system and method.
In order to achieve the above object, in a first aspect of the present disclosure, there is provided a dc 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 content of the first and second substances,
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 is used for pre-charging after being powered on and sending a working instruction to the DCDC when the pre-charging is determined to be completed;
and the DCDC is used for converting the high-voltage direct current into a second low-voltage direct current to charge the storage battery if the DCDC receives the working instruction after being powered by the first low-voltage direct current.
Optionally, the dc charging device includes a low-voltage dc output terminal and a high-voltage dc output terminal, the low-voltage dc output terminal is configured to connect the power supply terminal of the BMC and the power supply terminal of the DCDC, the high-voltage dc output terminal is configured to connect the input terminal of the power battery and the high-voltage input terminal of the DCDC,
the direct current charging device is used for providing the first low-voltage direct current for 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 for 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 terminals of the BMC include a constant power supply terminal and an abnormal power supply terminal, and the low-voltage direct current output terminal is connected with the constant power supply terminal and the abnormal power supply terminal.
Optionally, a first diode is arranged between the low-voltage direct current output end and the normally-powered 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 normally-powered power supply end, a second diode is arranged between the low-voltage direct current output end and the non-powered 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 non-powered power supply end.
Optionally, the output end of the storage battery is connected with the unloading relay and then connected with the abnormal 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 abnormal power supply end, the output end of the storage battery is connected with the normal 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 normal power supply end.
Optionally, the low-voltage dc output terminal is connected to the power supply terminal of the DCDC through a fifth diode, an anode of the fifth diode is connected to the low-voltage dc output terminal, and a cathode of the fifth diode is connected to the power supply terminal of the DCDC.
Optionally, the output end of the battery is connected to the power supply end of the DCDC through a sixth diode, the anode of the sixth diode is connected to the output end of the battery, the cathode of the sixth diode is connected to the power supply end of the DCDC, and the cathode of the fifth diode is connected to the cathode of the sixth diode.
Optionally, the power supply terminal of the DCDC includes 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.
Optionally, the ordinary power supply end of the BMC includes a first ordinary power supply end and a second ordinary power supply end, the output end of the battery is connected to the first ordinary power supply end through a ninth diode, the output end of the battery is connected to the second ordinary power supply end through a tenth diode, the anode of the ninth diode and the anode of the twelfth diode are both connected to the output end of the battery, the cathode of the ninth diode is connected to the first ordinary power supply end, and the cathode of the twelfth diode is connected to the second ordinary power supply end.
In a second aspect of the present disclosure, there is provided a dc charging method applied to a dc charging system, the dc 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 is used for pre-charging after being powered on, and sending a working instruction to the DCDC when determining that the pre-charging is completed;
after the DCDC is powered by the first low-voltage direct current, if the DCDC receives the working instruction, the DCDC converts the high-voltage direct current into a second low-voltage direct current to charge the storage battery.
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 is used for pre-charging after being powered on, and sending a working instruction to the DCDC when determining that the pre-charging is completed; DCDC is by first low voltage direct current power supply after, if receive work order, then will high-voltage direct current converts second low voltage direct current into, does storage battery charging, like this, can pass through DC charging device does BMC with DCDC provides first low voltage direct current, and does power battery with DCDC provides high voltage direct current, so that DCDC after the power supply, can with high voltage direct current converts second low voltage direct current into, for storage battery charging can give power battery carries out high voltage charging, for storage battery charging can effectively avoid under the condition of battery feed, uses external battery to take the electricity for the battery in the vehicle to can avoid the damage vehicle that causes and the phenomenon that produces bodily injury to appear, thereby can effectively promote vehicle user experience.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting 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 circuit schematic of a DC charging system according to the embodiment shown in FIG. 1;
FIG. 3 is a circuit schematic of another DC charging system according to the embodiment shown in FIG. 1;
FIG. 4 is a schematic view of a connector interface according to the embodiment shown in FIG. 2;
fig. 5 is a flowchart illustrating a dc charging method according to another exemplary embodiment of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Before describing in detail the embodiments of the present disclosure, the following description is first provided in a specific application scenario of the present disclosure, which may be applied in a scenario of battery feeding in a vehicle, wherein, the vehicle can be a pure electric vehicle or a hybrid vehicle, under the condition of battery power supply in the vehicle, the vehicle cannot be started normally, and in the related art, in the case of battery feeding, a common method is to charge the battery in the vehicle by an external battery (for example, a battery in another vehicle or a mobile charger), that is, the output end of the storage battery is connected with other external storage batteries, so that the external storage batteries replace the storage battery to supply power for low-voltage electric equipment in the vehicle to start the vehicle, after the vehicle is started, the DCDC module in the vehicle converts the high-voltage electricity in the power battery into low-voltage direct current to charge the storage battery. However, because the number of wire harnesses in the vehicle is large, in the process of charging the vehicle through the external storage battery, the condition of overlapping wrong wires often occurs, or other misoperation occurs to damage the vehicle, and even the storage battery is ignited due to overlapping wrong wires in the charging process to cause certain personal injury.
In order to solve the above technical problem, the present disclosure provides a dc charging system and a method, where the dc charging system includes: the Direct Current 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 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 is used for carrying out pre-charging after being powered on and sending a working instruction to the DCDC when determining that the pre-charging is finished; the DCDC is used for converting the high-voltage direct current into a second low-voltage direct current to charge the storage battery if the working instruction is received after the DCDC is powered by the first low-voltage direct current. Like this, can provide first low voltage direct current for this BMC and this DCDC through this direct current charging device, and provide high voltage direct current for this power battery and this DCDC, so that this DCDC can turn into second low voltage direct current with this high voltage direct current after the power supply, charge for this battery, can be when carrying out high voltage charging for this power battery, charge for this battery, can effectively avoid under the circumstances of battery feed, because of using the damage vehicle that external battery caused and produce the phenomenon of bodily injury, thereby can effectively promote vehicle user experience.
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: the vehicle 102 comprises a BMC1021, a DCDC1022, a power battery 1023 and a storage battery 1024, wherein the DC charging device 101 is respectively connected with the BMC1021, the DCDC1022 and the power battery 1023, the BMC1021 is connected with the DCDC1022, and the DCDC1022 is also connected with the storage battery 1024; wherein the content of the first and second substances,
the dc charging device 101 is configured to provide a first low-voltage dc to the BMC1021 and the DCDC1022, and provide a high-voltage dc to the DCDC1022 and the power battery 1023;
the BMC1021, which is configured to perform pre-charging after being powered on, and send a work instruction to the DCDC1022 when it is determined that pre-charging is completed;
the DCDC1022 is configured to convert the high-voltage dc into a second low-voltage dc to charge the storage battery if the working instruction is received after the first low-voltage dc is supplied.
Wherein, the dc charging device 101 comprises a low voltage dc output terminal DL and a high voltage dc output terminal DH, the low voltage dc output terminal DL is used for connecting the power supply terminal of the BMC and the power supply terminal of the DCDC, the high voltage dc output terminal DH is used 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 power 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 power 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 may be the same as or different from the second low-voltage dc (e.g., both are 12V dc), for example, the first low-voltage dc is 12V dc, and the second low-voltage dc is 24V dc. The pre-charging is to charge the capacitor on the direct current bus of the related high-voltage module with low current before the high voltage of the vehicle is applied, so as to avoid the circuit from being burnt out due to the direct access of the high voltage, and the pre-charging can effectively ensure that the power battery and the DCDC can not burn out the circuit of the vehicle when the DCDC is accessed into the high-voltage direct current.
In addition, the DCDC1022 is further connected to the power battery 1023 in the vehicle, and when the DCDC1022 receives an operation instruction and the vehicle is in a charging process, the DCDC1022 converts the high-voltage direct current output by the charging device into a second low-voltage direct current to charge the storage battery, and after the vehicle is started, if the residual capacity of the power battery 1023 is determined to be greater than or equal to a preset capacity threshold, the high-voltage direct current output by the power battery 1023 can be converted into the second low-voltage direct current to charge the storage battery by the DCDC 1022.
Like this, in the vehicle charging process, this direct current charging device can be when charging for the power battery in the vehicle, charges for the battery in the vehicle through this DCDC1022, can effectively avoid under the condition of battery feed, because of using the damage vehicle that external battery caused and the phenomenon that produces bodily injury to can effectively promote vehicle user experience.
FIG. 2 is a circuit schematic 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 abnormal power supply terminal DY2, and the low-voltage dc output terminal DL is connected to the constant power supply terminal DY1 and the abnormal power supply terminal DY 2.
The BMC1021 includes an abnormal electricity utilization module (e.g., a high-voltage electricity collection module, a high-voltage contactor, etc.) and a normal electricity utilization module (e.g., the BMC1021 needs to be provided with normal electricity as a working voltage of its own control module), the normal electricity utilization module is connected to the output terminal OUT of the storage battery through the normal electricity supply terminal DY1, the abnormal electricity utilization module is connected to the output terminal OUT of the storage battery through the abnormal electricity supply terminal DY2 and an unloading relay (e.g., IG3), the normal electricity supply terminal DY1 is always in a powered state when the storage battery has an electric quantity output, and the abnormal electricity supply terminal DY2 is in a non-powered state when the unloading relay is in a disconnected state.
Optionally, as shown in fig. 2, a first diode D1 is disposed between the low-voltage dc output terminal DL and the normally-powered power terminal DY1, an anode of the first diode D1 is connected to the low-voltage dc output terminal DL, a cathode of the first diode D1 is connected to the normally-powered power terminal DY1, a second diode D2 is disposed between the low-voltage dc output terminal DL and the normally-powered power terminal DY2, an anode of the second diode D2 is connected to the low-voltage dc output terminal DL, and a cathode of the second diode D2 is connected to the normally-powered power terminal DY 2.
The output end OUT of the storage battery is connected with an unloading relay IG3 and then connected with the abnormal 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 abnormal power supply end DY2, the output end OUT of the storage battery is connected with the normal 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 normal power supply end DY 1.
The first diode D1 can prevent the current output from the normally-powered power supply DY1 of the BMC1021 from flowing to the low-voltage dc output DL of the dc charging device 101 when the low-voltage dc output DL of the dc charging device 101 is not powered; the cathodes of the second diode D2 and the third diode D3 are both connected to the abnormal power supply terminal DY2, where the second diode D2 can prevent the IG3 of the entire vehicle from being electrically connected to affect the stability of the low-voltage dc output terminal DL of the dc charging device 101, and meanwhile, the second diode D2 can also prevent the current of the abnormal power supply terminal DY2 of the BMC1021 in the vehicle from flowing to the dc charging device 101 when the low-voltage dc output terminal DL of the dc charging device 101 is not charged, so that a certain protection effect can be performed on the dc charging device 101, and the loss of electric quantity of the vehicle in a non-charging process can be reduced; because other power utilization modules are arranged below the IG3 relay, the third diode D3 can prevent the abnormal power supply end DY2 of the BMC1021 from supplying power to other power utilization modules arranged below the IG3 relay, and under the condition that the IG3 relay is pulled in, 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 in normal power, 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 power modules of the entire vehicle through the normal power distribution circuit of the BMC1021, where it is noted that, in order to reduce the performance requirement for the dc charging device 101 to output low-voltage dc, the output current of the low-voltage dc output terminal DL can be kept below 10A, and in the case of providing the fourth diode D4, the low-voltage dc output terminal DL can be prevented from supplying power to other normal power modules in the entire vehicle through the normal power distribution circuit of the BMC1021, and it should be noted that, when the low-voltage dc output terminal DL supplies power to other normal power modules in the entire vehicle through the normal power 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 will far exceed 10A, and therefore, in the case that the output current of the low-voltage dc output terminal DL is configured below 10A, output currents far exceeding 10A can easily damage the dc charging device 101 and the output lines. Therefore, the fourth diode D4 is provided to prevent the low-voltage dc output terminal DL from supplying power to other normal power supply modules in the entire vehicle through the normal power distribution circuit of the BMC1021, so as to effectively protect the dc charging device 101 and the peripheral lines from being damaged, thereby effectively improving 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 power cross connection of the entire vehicle from affecting the stability of the first low-voltage direct current output end DL of the direct current charging device 101 for outputting the first low-voltage direct current, meanwhile, the fifth diode D5 can also prevent the first low-voltage direct current from being provided at the low-voltage direct current output end DL of the direct current charging device 101, and when the power supply end DY3 of the DCDC1022 is electrified, the current of the power supply end DY3 of the DCDC1022 flows to the direct current charging device 101, so that the power supply phenomenon of other normal power utilization modules is affected.
Optionally, the output end OUT of the storage 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 end OUT of the storage 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 to prevent the low-voltage dc output terminal DL from supplying power to other normal power modules of the entire vehicle through the DCDC1022 normal power distribution circuit, so that the output current of the low-voltage dc output terminal DL far exceeds 10A, which may damage the dc charging device.
Therefore, the first diode is arranged between the low-voltage direct current output end and the normal power supply end of the BMC, the second diode is arranged between the low-voltage direct current output end and the abnormal power supply end of the BMC, the output end of the storage battery 1024 is connected with the abnormal power supply end of the BMC 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 the reliability of the direct current charging system can be effectively improved, and the user experience can be effectively improved.
FIG. 3 is a circuit schematic 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 power supply terminal DY3 of the DCDC1022 is powered by the first low-voltage power supply terminal DY31 and the second low-voltage power supply terminal DY32, and when the power supply branch corresponding to the first low-voltage power supply terminal DY31 fails, the power supply branch of the second low-voltage power supply terminal DY32 is also powered by the power supply terminal DY3 of the DCDC1022, so that the reliability of power supply of the power supply terminal DY3 of the DCDC1022 can be effectively improved, and the reliability of the whole vehicle can be effectively improved.
Optionally, the normally-powered power supply terminal DY1 of the BMC1021 includes a first normally-powered power supply terminal DY11 and a second normally-powered power supply terminal DY12, the output terminal of the battery 1024 is connected with the first normally-powered power supply terminal DY11 through a ninth diode D9, the output terminal OUT of the battery 1024 is connected with the second normally-powered power supply terminal DY12 through a twelfth diode D10, both an anode of the ninth diode D9 and an anode of the twelfth diode D10 are connected with the output terminal OUT of the battery 1024, a cathode of the ninth diode D9 is connected with the first normally-powered power supply terminal DY11, and a cathode of the twelfth diode D10 is connected with the second normally-powered power supply terminal DY 12.
The power supply branch corresponding to the first normally-powered power supply end DY11 and the second normally-powered power supply end DY12 supplies power to the normally-powered power supply end DY1 of the BMC1021, and when the power supply branch corresponding to the first normally-powered power supply end DY11 fails, the power supply branch of the second normally-powered power supply end DY12 still supplies power to the normally-powered power supply end DY1 of the BMC1021, so that the reliability of power supply of the normally-powered 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 low-voltage connectors.
Illustratively, as shown in fig. 4, fig. 4 is a schematic diagram of the connector interface according to the embodiment shown in fig. 2, the interfaces No. 1-10 at the socket end of the connector are respectively: the No. 1 interface is connected with the low-voltage direct-current output end DL of the direct-current charging device 101, the No. 2 interface is connected with the output end OUT of the storage battery 1024 and serves as a normal-current access end of a connector, the No. 3 interface is connected with the first low-voltage power supply end DY31 of the DCDC1022, the No. 4 interface is connected with the second low-voltage power supply end DY32 of the DCDC1022, the No. 5 interface is connected with the output end OUT of the storage battery 1024 and serves as a normal-current access end of the connector, the No. 6 interface is connected with the first normal-current power supply end DY11 of the BMC1021, the No. 7 interface is connected with the second normal-current power supply end DY12 of the BMC1021, the No. 8 interface is connected with the unloading IG relay 3 and serves as a normal-current access end of the connector, and the No. 9 interface is connected with the abnormal-current 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 to the interface No. 1, the cathode of the first diode D1 is connected between the interface No. 6 and the interface No. 7, the cathode of the first diode D1 is also connected to the cathode of the fourth diode D4, the anode of the fourth diode D4 is connected to the interface No. 5, the anode of the second diode D2 is connected to the interface No. 9, the anode of the second diode D2 is also connected to the cathode of the third diode D3, the anode of the third diode D3 is connected to the interface No. 8, the anode of the fifth diode D5 is connected to the interface No. 1, the cathode of the fifth diode D5 is connected to the interface No. 3 and the cathode of the interface No. 4, and the cathode of the sixth diode D5 is also connected to the cathode of the diode D6, the anode of the sixth diode D6 is connected to the interface No. 2. Like this through this connector with this first diode D1, second diode D2, third diode D3, fourth diode D4, fifth diode D5, sixth diode D6 inserts between this direct current charging device 101 and this vehicle, can accomplish in the vehicle this BMC1021 and this DCDC 1022's hardware circuit realization diode's access of need not changing, and cross this connector access this diode, be favorable to maintenance and processing in later stage, thereby can promote later stage maintenance efficiency, promote user experience.
In this way, the first low-voltage power supply terminal DY31 and the second low-voltage power supply terminal DY32 are used for supplying power to the DCDC1022, the reliability of power supply of the power supply terminal DY3 of the DCDC1022 can be effectively improved, the first constant power supply terminal DY11 and the second constant power supply terminal DY12 are used for supplying power to the constant power supply terminal DY1 of the BMC, the reliability of power supply of the constant power supply terminal DY1 of the BMC can be effectively improved, the reliability of the whole vehicle can be effectively improved, and the reliability of the direct-current charging system can be effectively improved.
Fig. 5 is a flow chart illustrating a dc charging method according to another exemplary embodiment of the present disclosure; referring to fig. 5, the dc 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 command is received, the high-voltage dc is converted into a second low-voltage dc to charge the storage battery.
Above-mentioned technical scheme, in the vehicle charging process, this direct current charging device can be when charging for the power battery in the vehicle, charges for the battery in the vehicle through this DCDC, can effectively avoid under the condition of battery feed, because of using the damage vehicle that external battery caused and the phenomenon that produces bodily injury to can effectively promote vehicle user experience.
The specific manner in which the method steps in the above embodiments, and the operations performed by the various steps, have been described in detail in relation to the embodiments of the system, will not be elaborated upon here.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
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 combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A dc 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 content of the first and second substances,
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 is used for pre-charging after being powered on and sending a working instruction to the DCDC when the pre-charging is determined to be completed;
and the DCDC is used for converting the high-voltage direct current into a second low-voltage direct current to charge the storage battery if the DCDC receives the working instruction after being powered by the first low-voltage direct current.
2. The system of claim 1, wherein the DC charging device comprises a low voltage DC output for connecting the BMC power supply terminal and the DCDC power supply terminal, and a high voltage DC output for connecting the power battery input terminal and the DCDC high voltage input terminal,
the direct current charging device is used for providing the first low-voltage direct current for 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 for 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 terminals of the BMC comprise a permanent power terminal and a non-permanent power terminal, and the low-voltage DC output terminal is connected with the permanent power terminal and the non-permanent power terminal.
4. The system according to claim 3, wherein a first diode is disposed between the low-voltage DC output terminal and the constant-power supply terminal, an anode of the first diode is connected to the low-voltage DC output terminal, a cathode of the first diode is connected to the constant-power supply terminal, a second diode is disposed between the low-voltage DC output terminal and the non-constant-power supply terminal, an anode of the second diode is connected to the low-voltage DC output terminal, and a cathode of the second diode is connected to the non-constant-power supply terminal.
5. The system according to claim 3, wherein the output terminal of the storage battery is connected to the non-normal power supply terminal through a third diode after being connected to the unloading relay, the anode of the third diode is connected to the unloading relay, the cathode of the third diode is connected to the non-normal power supply terminal, the output terminal of the storage battery is connected to the normal power supply terminal through a fourth diode, the anode of the fourth diode is connected to the output terminal of the storage battery, and the cathode of the fourth diode is connected to the normal power supply terminal.
6. The system of claim 3, wherein the low voltage DC output terminal is connected to the power supply terminal of the DCDC through a fifth diode, an anode of the fifth diode is connected to the low voltage DC output terminal, and a cathode of the fifth diode is connected to the power supply terminal of the DCDC.
7. The apparatus of claim 6, wherein the output terminal of the battery is connected to the power supply terminal of the DCDC through a sixth diode, an anode of the sixth diode is connected to the output terminal of the battery, a cathode of the sixth diode is connected to the power supply terminal of the DCDC, and a cathode of the fifth diode is connected to a cathode of the sixth diode.
8. The system of claim 3, wherein the power supply terminals of the DCDC comprise a first low voltage power supply terminal and a second low voltage power supply terminal, the output terminal of the storage battery is connected to the first low voltage power supply terminal through a seventh diode, the output terminal of the storage battery is connected to the second power supply terminal through an eighth diode, an anode of the seventh diode and an anode of the eighth diode are both connected to the output terminal of the storage battery, a cathode of the seventh diode is connected to the first low voltage power supply terminal, and a cathode of the eighth diode is connected to the second low voltage power supply terminal.
9. The system of claim 3, wherein the normally-powered terminals of the BMC comprise a first normally-powered terminal and a second normally-powered terminal, the output terminal of the battery is connected to the first normally-powered terminal through a ninth diode, the output terminal of the battery is connected to the second normally-powered terminal through a tenth diode, an anode of the ninth diode and an anode of the twelfth diode are both connected to the output terminal of the battery, a cathode of the ninth diode is connected to the first normally-powered terminal, and a cathode of the twelfth diode is connected to the second normally-powered terminal.
10. A DC charging method is applied to a DC charging system, and the DC 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; 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 is used for pre-charging after being powered on, and sending a working instruction to the DCDC when determining that the pre-charging is completed;
after the DCDC is powered by the first low-voltage direct current, if the DCDC receives the working instruction, the DCDC converts the high-voltage direct current into a second low-voltage direct current to charge the storage battery.
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| CN114312373B (en) | 2023-05-05 |
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