AC-DC integrated charging system and charging plug

Abstract

The invention relates to the technical field of electric vehicle charging, and discloses an alternating-current and direct-current integrated charging system and a charging plug. The alternating-current and direct-current integrated charging system comprises a charging pile end and a vehicle end, and the charging pile end comprises an alternating-current and direct-current charging gun module; the vehicle end comprises a vehicle charging seat module, a vehicle distribution box module, a vehicle-mounted charger module and a power battery module, the vehicle distribution box module is used for switching the charging mode of the charging system, and the alternating current and direct current charging gun module is used for providing alternating current or direct current for the vehicle end according to the charging mode of the charging system; a direct-current plug and an alternating-current plug can be integrated into an integrated plug, only one charging port is needed for alternating-current charging and direct-current charging, the layout limitation of an existing alternating-current and direct-current charging port is overcome, the cost of the whole vehicle is reduced, meanwhile, fast and flexible switching between fast charging and slow charging is achieved through the vehicle distribution box module, and the charging efficiency is improved. The fast and slow charging switching complexity is reduced, the charging time is shortened, and the charging efficiency is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging, and in particular to an AC / DC integrated charging system and a charging plug. Background Art

[0002] With the rapid development of power batteries, it not only helps the popularization of new energy household cars, but also provides a strong guarantee for the transformation of construction machinery vehicles from traditional fossil energy power to new energy power. For example, electric excavators are increasingly favored by users due to their environmental protection, energy saving, simple maintenance and easy intelligent control.

[0003] At present, most electric excavators in the industry can only support a single charging mode of AC or DC, which limits their ability to operate in different environments. In addition, the internal space of the excavator is compact, and the traditional design is difficult to accommodate both standard and fast charging interfaces, resulting in low excavator charging efficiency. Therefore, it is particularly important to propose a technical solution that can overcome the layout limitations of existing AC and DC charging ports and improve charging efficiency and flexibility. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an AC / DC integrated charging system and a charging plug, which can overcome the layout limitations of existing AC / DC charging ports and improve charging efficiency and flexibility.

[0005] In order to solve the above technical problems, the first aspect of the present invention discloses an AC / DC integrated charging system, characterized in that the charging system includes a charging pile end and a vehicle end, the charging pile end includes an AC / DC charging gun module, and the vehicle end includes a vehicle charging seat module, a vehicle distribution box module, an on-board charger module and a power battery module, wherein:

[0006] One end of the vehicle charging seat module is electrically connected to one end of the vehicle power distribution box module, and the other end of the vehicle power distribution box module is electrically connected to one end of the vehicle charger module and one end of the power battery module respectively, and the other end of the vehicle charger module is electrically connected to the other end of the power battery module. When the vehicle end needs to be charged through the charging pile end, the current output end of the AC / DC charging gun module is used to be electrically connected to the current input end of the vehicle charging seat module;

[0007] When the vehicle end needs to be charged with DC through the charging pile end, the vehicle distribution box module is used to switch the charging mode of the charging system to the DC charging mode, the AC / DC charging gun module is used to provide DC current to the vehicle end, and the vehicle charging seat module and the vehicle distribution box module are used to transmit the DC current to the power battery module;

[0008] When the vehicle end needs to be charged with AC through the charging pile end, the vehicle distribution box module is used to switch the charging mode of the charging system to the AC charging mode, the AC / DC charging gun module is used to provide AC current to the vehicle end, the vehicle charging seat module and the vehicle distribution box module are used to transmit the AC current to the on-board charger module, and the on-board charger module is used to convert the AC current into a converted DC current and transmit the converted DC current to the power battery module.

[0009] As an optional implementation, in the first aspect of the present invention, the AC / DC charging gun module includes a DC charging unit and an AC charging unit, and the vehicle power distribution box module includes a charging mode switch, a fast charging unit, and a slow charging unit, wherein:

[0010] When the vehicle end needs to be charged through the charging pile end, the DC output end of the DC charging unit and the AC output end of the AC charging unit are electrically connected to the current input end of the vehicle charging seat module respectively, and one end of the charging mode switching switch is electrically connected to one end of the vehicle charging seat module;

[0011] When the vehicle end needs to be DC charged through the charging pile end, the other end of the charging mode switch is used to be electrically connected to one end of the fast charging unit to implement the operation of switching the charging mode of the charging system to the DC charging mode, and the other end of the fast charging unit is electrically connected to one end of the power battery module;

[0012] When the vehicle end needs to be charged with AC through the charging pile end, the other end of the charging mode switch is used to be electrically connected to one end of the slow charging unit to implement the operation of switching the charging mode of the charging system to the AC charging mode, and the other end of the slow charging unit is electrically connected to one end of the on-board charger module;

[0013] The DC charging unit is used to provide the DC current to the vehicle end, and the AC charging unit is used to provide the AC current to the vehicle end.

[0014] As an optional embodiment, in the first aspect of the present invention, the DC charging unit includes a first low-voltage connector, the AC charging unit includes a second low-voltage connector, and the vehicle charging seat module includes a third low-voltage connector and a fourth low-voltage connector, wherein:

[0015] When the vehicle end needs to be charged through the charging pile end, the first low-voltage connector is electrically connected to one end of the third low-voltage connector, the second low-voltage connector is electrically connected to one end of the fourth low-voltage connector, and the other end of the third low-voltage connector and the other end of the fourth low-voltage connector are electrically connected to one end of the charging mode switching switch respectively;

[0016] When the charging mode of the charging system is the DC charging mode, the first low-voltage connector is used to perform DC communication with the vehicle distribution box module and the power battery module through the third low-voltage connector. When the charging mode of the charging system is the AC charging mode, the second low-voltage connector is used to perform AC communication with the vehicle distribution box module and the power battery module through the fourth low-voltage connector.

[0017] As an optional embodiment, in the first aspect of the present invention, the DC charging unit further includes a first resistor and a second resistor, the vehicle charging seat module includes a third resistor, the power battery module includes a fourth resistor, the first low-voltage connector includes an auxiliary power supply terminal, a first communication terminal and a first charging connection confirmation terminal, and the third low-voltage connector includes a second charging connection confirmation terminal, wherein:

[0018] One end of the first resistor is used to be electrically connected to a first external power supply, the other end of the first resistor is electrically connected to one end of the second resistor, the other end of the second resistor is electrically connected to the charging connection confirmation end, the other end of the second resistor is also used to be grounded, the third resistor is electrically connected to the second charging connection confirmation end, one end of the fourth resistor is used to be electrically connected to a second external power supply, and the other end of the fourth resistor is electrically connected to the other end of the fast charging unit;

[0019] When the charging mode of the charging system is the DC charging mode, the auxiliary power supply end is used to output a wake-up voltage to wake up the vehicle distribution box module and the power battery module, the first communication end is used to perform DC communication with the vehicle distribution box module and the power battery module, and when the current output end of the AC / DC charging gun module is initially connected to the current input end of the vehicle charging seat module, the first detection voltage of the other end of the first resistor is the first voltage, and the second detection voltage of the other end of the fourth resistor is the second voltage;

[0020] When the charging mode of the charging system is the DC charging mode, and when the current output end of the AC / DC charging gun module is connected to the current input end of the vehicle charging seat module, the first detection voltage at the other end of the first resistor is the third voltage, and the second detection voltage at the other end of the fourth resistor is the fourth voltage.

[0021] As an optional implementation, in the first aspect of the present invention, the second low-voltage connector includes a second communication terminal and a third charging connection confirmation terminal, wherein:

[0022] When the charging mode of the charging system is the AC charging mode, the second communication end is used to wake up the vehicle distribution box module and the power battery module, and perform AC communication with the vehicle distribution box module and the power battery module, and when the current output end of the AC / DC charging gun module is initially connected to the current input end of the vehicle charging seat module, the third detection voltage of the third charging connection confirmation end is the fifth voltage;

[0023] When the charging mode of the charging system is the AC charging mode, and when the current output end of the AC / DC charging gun module is connected to the current input end of the vehicle charging seat module, the third detection voltage of the third charging connection confirmation end is the sixth voltage.

[0024] As an optional embodiment, in the first aspect of the present invention, when the charging mode of the charging system is the AC charging mode, and when the current output end of the AC / DC charging gun module is connected to the current input end of the vehicle charging seat module, the on-board charger module is used to determine the AC output power of the AC charging unit, the main body output power of the on-board charger module and the requested output power of the power battery module, and determine the minimum current value based on the AC output power, the main body output power and the requested output power, and convert the AC current into the converted DC current based on the minimum current value.

[0025] As an optional implementation, in the first aspect of the present invention, the charging protocol between the charging pile end and the vehicle end includes the national standard GBT27930-2015 charging protocol.

[0026] The second aspect of the present invention discloses an AC / DC integrated charging plug, characterized in that the charging plug includes the AC / DC charging gun module described in any one of the first aspect of the present invention, wherein the charging plug includes positive and negative power pins, positive and negative auxiliary power pins and low-voltage connector pins, and the number of pins of the charging plug includes 14 pins.

[0027] As an optional implementation, in the second aspect of the present invention, the charging head model of the charging plug includes European standard REMA320.

[0028] As an optional implementation, in the second aspect of the present invention, the standard charging current of the charging plug includes 320A.

[0029] The implementation of the present invention has the following beneficial effects:

[0030] In the present invention, an AC / DC integrated charging system is provided, which includes a charging pile end and a vehicle end, the charging pile end includes an AC / DC charging gun module, the vehicle end includes a vehicle charging seat module, a vehicle distribution box module, an on-board charger module and a power battery module, wherein one end of the vehicle charging seat module is electrically connected to one end of the vehicle distribution box module, the other end of the vehicle distribution box module is electrically connected to one end of the on-board charger module and one end of the power battery module respectively, the other end of the on-board charger module is electrically connected to the other end of the power battery module, when the vehicle end needs to be charged through the charging pile end, the current output end of the AC / DC charging gun module is used to be electrically connected to the current input end of the vehicle charging seat module; ... When the pile end performs DC charging on the vehicle end, the vehicle distribution box module is used to switch the charging mode of the charging system to the DC charging mode, the AC / DC charging gun module is used to provide DC current to the vehicle end, and the vehicle charging seat module and the vehicle distribution box module are used to transmit the DC current to the power battery module; when the vehicle end needs to be charged with AC through the charging pile end, the vehicle distribution box module is used to switch the charging mode of the charging system to the AC charging mode, the AC / DC charging gun module is used to provide AC current to the vehicle end, the vehicle charging seat module and the vehicle distribution box module are used to transmit the AC current to the on-board charger module, and the on-board charger module is used to convert the AC current into a converted DC current, and transmit the converted DC current to the power battery module. It can be seen that the present invention integrates the DC plug and the AC plug into an integrated plug through the AC / DC charging gun module, and only one charging port is required for AC and DC charging, which overcomes the layout limitations of the existing AC / DC charging ports and reduces the cost of the whole vehicle. At the same time, the vehicle distribution box module is used to realize the fast and flexible switching of fast charging and slow charging, reduce the complexity of fast and slow charging switching, speed up the charging time, and thus improve the charging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a structural schematic diagram of an AC / DC integrated charging system disclosed in an embodiment of the present invention;

[0033] Figure 2 It is a structural schematic diagram of another AC / DC integrated charging system disclosed in an embodiment of the present invention;

[0034] Figure 3 It is a structural schematic diagram of another AC / DC integrated charging system disclosed in an embodiment of the present invention;

[0035] Figure 4 It is a structural schematic diagram of an AC / DC integrated charging plug disclosed in an embodiment of the present invention;

[0036] Figure 5 It is a schematic structural diagram of another AC / DC integrated charging plug disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that, unless otherwise clearly specified and limited, the term "electrical connection" in the specification and claims of the present invention and the above-mentioned drawings should be understood in a broad sense. For example, it can be a fixed electrical connection, a detachable electrical connection, or an integral electrical connection; it can be a mechanical electrical connection, an electrical electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. In addition, the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. The terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Embodiment 1

[0040] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of an AC / DC integrated charging system disclosed in an embodiment of the present invention. The charging system can be applied to any vehicle that needs AC charging and / or DC charging, including but not limited to new energy vehicles, new energy excavators, new energy bulldozers, etc., which are not limited in the embodiment of the present invention. Figure 1 As shown, the AC / DC integrated charging system includes a charging pile end 10 and a vehicle end 20, the charging pile end 10 includes an AC / DC charging gun module 101, and the vehicle end 20 includes a vehicle charging seat module 201, a vehicle distribution box module 202, an on-board charger module 203 and a power battery module 204, wherein:

[0041] One end of the vehicle charging seat module 201 is electrically connected to one end of the vehicle distribution box module 202, and the other end of the vehicle distribution box module 202 is electrically connected to one end of the vehicle charger module 203 and one end of the power battery module 204 respectively, and the other end of the vehicle charger module 203 is electrically connected to the other end of the power battery module 204. When the vehicle end 20 needs to be charged through the charging pile end 10, the current output end of the AC / DC charging gun module 101 is used to be electrically connected to the current input end of the vehicle charging seat module 201;

[0042] When the vehicle end 20 needs to be charged with DC through the charging pile end 10, the vehicle distribution box module 202 is used to switch the charging mode of the charging system to the DC charging mode, the AC / DC charging gun module 101 is used to provide DC current to the vehicle end 20, and the vehicle charging seat module 201 and the vehicle distribution box module 202 are used to transmit the DC current to the power battery module 204;

[0043] When the vehicle end 20 needs to be charged with AC through the charging pile end 10, the vehicle distribution box module 202 is used to switch the charging mode of the charging system to the AC charging mode, the AC / DC charging gun module 101 is used to provide AC current to the vehicle end 20, the vehicle charging seat module 201 and the vehicle distribution box module 202 are used to transmit the AC current to the on-board charger module 203, and the on-board charger module 203 is used to convert the AC current into a converted DC current and transmit the converted DC current to the power battery module 204.

[0044] In an embodiment of the present invention, optionally, an AC / DC integrated charging system may include a charging pile end 10 and a vehicle end 20, wherein the charging pile end 10 may be a general charging pile or a dedicated charging pile for the vehicle end 20, and the charging pile end 10 may include a charging plug, which may include an AC / DC charging gun module 101, that is, the vehicle end 20 may be DC charged (fast charging) or DC charged (standard charging) through the charging plug, and the charging protocol between the charging pile end 10 and the vehicle end 20 may include the national standard GBT27930-2015 charging protocol, which is not limited by the present invention.

[0045] In an embodiment of the present invention, optionally, the vehicle end 20 may include a vehicle charging seat module 201, a vehicle distribution box module 202, an on-board charger module 203 and a power battery module 204 integrated on the vehicle, wherein the vehicle may include a civilian electric vehicle, an electric engineering machinery vehicle, etc. Specifically, it may include one or more of an electric engineering transport vehicle, an electric crane, an electric excavator, an electric bulldozer, an electric roller, an electric loader, an electric engineering rescue vehicle, an electric trailer, etc., and the present invention is not limited thereto.

[0046] In an embodiment of the present invention, optionally, a pluggable connection can be made between the AC / DC charging gun module 101 and the vehicle charging seat module 201. When it is necessary to perform DC charging on the vehicle end 20 through the charging pile end 10, the charging mode of the charging system is switched to the DC charging mode through the vehicle distribution box module 202, and the charging gun on the charging pile end 10 is inserted into the vehicle end, that is, the AC / DC charging gun module 101 is inserted into the vehicle charging seat module 201, so that the AC / DC charging gun module 101 is electrically connected to the vehicle charging seat module 201, and DC current is provided to the vehicle end 20 through the AC / DC charging gun module 101, and the vehicle charging seat module 201 and the vehicle distribution box module 202 transmit the DC current to the power battery module 204, thereby realizing DC charging of the vehicle power battery.

[0047] In the embodiment of the present invention, optionally, when it is necessary to perform AC charging on the vehicle end 20 through the charging pile end 10, the charging mode of the charging system is switched to the AC charging mode through the vehicle distribution box module 202, and AC current is provided to the vehicle end 20 through the AC / DC charging gun module 101. The vehicle charging seat module 201 and the vehicle distribution box module 202 transmit the AC current to the on-board charger module 203, and the on-board charger module 203 converts the AC current into a converted DC current, and transmits the converted DC current to the power battery module 204, thereby realizing AC charging of the vehicle power battery.

[0048] It can be seen that implementation Figure 1 The described AC / DC integrated charging system can integrate the DC plug and AC plug into an integrated plug through the AC / DC charging gun module. Only one charging port is needed for AC and DC charging, which overcomes the layout limitations of existing AC / DC charging ports and reduces the cost of the entire vehicle. At the same time, the vehicle distribution box module can realize fast and flexible switching between fast charging and slow charging, reduce the complexity of fast and slow charging switching, speed up the charging time, and thus improve the charging efficiency.

[0049] In an optional embodiment, if Figure 2 As shown, Figure 2 is a schematic diagram of the structure of another AC / DC integrated charging system disclosed in an embodiment of the present invention. Figure 2 As shown, the AC / DC charging gun module 101 includes a DC charging unit 1011 and an AC charging unit 1012, and the vehicle distribution box module 202 includes a charging mode switch 2021, a fast charging unit 2022 and a slow charging unit 2023, wherein:

[0050] When the vehicle end 20 needs to be charged through the charging pile end 10, the DC output end of the DC charging unit 1011 and the AC output end of the AC charging unit 1012 are electrically connected to the current input end of the vehicle charging seat module 201 respectively, and one end of the charging mode switching switch 2021 is electrically connected to one end of the vehicle charging seat module 201;

[0051] When the vehicle end 20 needs to be charged with DC through the charging pile end 10, the other end of the charging mode switch 2021 is used to be electrically connected to one end of the fast charging unit 2022 to switch the charging mode of the charging system to the DC charging mode, and the other end of the fast charging unit 2022 is electrically connected to one end of the power battery module 204;

[0052] When the vehicle end 20 needs to be charged with AC through the charging pile end 10, the other end of the charging mode switching switch 2021 is used to be electrically connected to one end of the slow charging unit 2023 to switch the charging mode of the charging system to the AC charging mode, and the other end of the slow charging unit 2023 is electrically connected to one end of the on-board charger module 203;

[0053] The DC charging unit 1011 is used to provide a DC current to the vehicle end, and the AC charging unit 1012 is used to provide an AC current to the vehicle end.

[0054] In this optional embodiment, optionally, a pluggable connection can be made between the AC / DC charging gun module and the vehicle charging seat module. When the charging gun on the charging pile end is inserted into the vehicle end, that is, the AC / DC charging gun module is electrically connected to the vehicle charging seat module, the DC charging unit and the AC charging unit are simultaneously inserted into the vehicle charging seat module. When it is necessary to perform DC charging on the vehicle end through the charging pile end, the charging mode switching switch is adjusted so that the vehicle charging group module is electrically connected to the fast charging unit through the charging mode switching switch. When it is necessary to perform AC charging on the vehicle end through the charging pile end, the charging mode switching switch is adjusted so that the vehicle charging group module is electrically connected to the slow charging unit through the charging mode switching switch. The method of adjusting the charging mode switching switch may include clicking the corresponding switch to adjust or fluctuating the corresponding switch lever to adjust.

[0055] In this optional embodiment, optionally, as Figure 3 As shown, Figure 3 is a structural schematic diagram of another AC / DC integrated charging system disclosed in an embodiment of the present invention, such as Figure 3As shown, the charging mode switch 2021 includes five switch pins, specifically including a DC+ pin, a DC- pin, a CC1 pin, a CC2 pin and a PE pin. When the vehicle end 20 needs to be DC charged through the charging pile end 10, the five switch pins of the charging mode switch 2021 are adjusted to be electrically connected to the pins corresponding to the charging mode switch 2021 in the fast charging unit 2022. The fast charging unit 2022 includes a DC+ pin, a DC- pin, a CAN+ pin, a CAN- pin, an A+ pin, an A- pin, a CC2 pin and PE pin, the pins corresponding to the charging mode switch 2021 in the fast charging unit 2022 include DC+ pin, DC- pin, CC2 pin and PE pin; when the vehicle end 20 needs to be AC ​​charged through the charging pile end 10, adjust the five switch pins of the charging mode switch 2021 to make them electrically connected to the pins corresponding to the charging mode switch 2021 in the slow charging unit 2023, and the pins corresponding to the charging mode switch 2021 in the slow charging unit 2023 include L1 pin, N pin, CC pin, CP pin and PE pin.

[0056] In another optional embodiment, Figure 3 As shown, the DC charging unit 1011 includes a first low-voltage connector K1, the AC charging unit 1012 includes a second low-voltage connector K2, and the vehicle charging seat module 201 includes a third low-voltage connector K3 and a fourth low-voltage connector K4, wherein:

[0057] When the vehicle end 20 needs to be charged through the charging pile end 10, the first low-voltage connector K1 is electrically connected to one end of the third low-voltage connector K3, the second low-voltage connector K2 is electrically connected to one end of the fourth low-voltage connector K4, and the other end of the third low-voltage connector K3 and the other end of the fourth low-voltage connector K4 are electrically connected to one end of the charging mode switching switch 2021 respectively;

[0058] When the charging mode of the charging system is the DC charging mode, the first low-voltage connector K1 is used to perform DC communication with the vehicle distribution box module 202 and the power battery module 204 through the third low-voltage connector K3. When the charging mode of the charging system is the AC charging mode, the second low-voltage connector K2 is used to perform AC communication with the vehicle distribution box module 202 and the power battery module 204 through the fourth low-voltage connector K4.

[0059] In this optional embodiment, optionally, the DC charging unit 1011 includes a first low-voltage connector K1, a DC+ pin, a DC- pin and a PE pin, the first low-voltage connector K1 includes an auxiliary power supply terminal, a first communication terminal and a first charging connection confirmation terminal, the auxiliary power supply terminal includes an A+ pin and an A- pin, the first communication terminal includes a Charge CANH pin and a Charge CANL pin, the first charging connection confirmation terminal includes a CC1 pin and a CC2 pin, the pins of the third low-voltage connector K3 correspond one-to-one to the pins of the first low-voltage connector K1, and when the charging mode of the charging system is a DC charging mode, the first low-voltage connector K1 is used to perform DC communication with the vehicle distribution box module 202 and the power battery module 204 through the third low-voltage connector K3, specifically including: waking up the communication module of the vehicle distribution box module 202 and the power battery module 204 based on the auxiliary power supply terminal of the first low-voltage connector K1, and then communicating with the vehicle distribution box module 202 and the power battery module 204 based on the first communication terminal of the first low-voltage connector K1.

[0060] In this optional embodiment, optionally, the third low-voltage connector K3 includes a PE pin, a CC pin and a CP pin. When the charging mode of the charging system is the AC charging mode, the second low-voltage connector K2 is used to communicate with the vehicle distribution box module 202 and the power battery module 204 through the fourth low-voltage connector K4, specifically including: waking up the vehicle distribution box module 202 and the power battery module 204 through the CC pin of the third low-voltage connector K3, and then communicating with the vehicle distribution box module 202 and the power battery module 204 through the CP pin of the third low-voltage connector K3.

[0061] In yet another optional embodiment, Figure 3 As shown, the DC charging unit 1011 also includes a first resistor R1 and a second resistor R2, the vehicle charging seat module 201 includes a third resistor R3, the power battery module 204 includes a fourth resistor R4, the first low-voltage connector K1 includes an auxiliary power supply terminal, a first communication terminal and a first charging connection confirmation terminal, and the third low-voltage connector K3 includes a second charging connection confirmation terminal, wherein:

[0062] One end of the first resistor R1 is used to be electrically connected to the first external power supply U1, the other end of the first resistor R1 is electrically connected to one end of the second resistor R2, the other end of the second resistor R2 is electrically connected to the charging connection confirmation end, the other end of the second resistor R2 is also used to be grounded, the third resistor R3 is electrically connected to the second charging connection confirmation end, one end of the fourth resistor R4 is used to be electrically connected to the second external power supply U2, and the other end of the fourth resistor R4 is electrically connected to the other end of the fast charging unit 2022;

[0063] When the charging mode of the charging system is a DC charging mode, the auxiliary power supply end is used to output a wake-up voltage to wake up the vehicle distribution box module 202 and the power battery module 204, and the first communication end is used to perform DC communication with the vehicle distribution box module 202 and the power battery module 204, and when the current output end of the AC / DC charging gun module 101 is initially connected to the current input end of the vehicle charging seat module 201, the first detection voltage of the other end of the first resistor R1 is the first voltage, and the second detection voltage of the other end of the fourth resistor R4 is the second voltage;

[0064] When the charging mode of the charging system is a DC charging mode, and when the current output end of the AC / DC charging gun module 101 is connected to the current input end of the vehicle charging seat module 201, the first detection voltage at the other end of the first resistor R1 is the third voltage, and the second detection voltage at the other end of the fourth resistor R4 is the fourth voltage.

[0065] In this optional embodiment, optionally, the DC charging unit 1011 also includes a charging pile controller, the first external power supply electrical connection U1 may include a mains power supply, the other end of the first resistor R1 is also electrically connected to the charging pile controller, and the connection point between the other end of the first resistor R1 and the charging pile controller can be determined as the first detection point, the second external power supply electrical connection U2 can be the internal power supply of the power battery module, and the other end of the fourth resistor R4 is electrically connected to the other end of the fast charging unit 2022. Specifically, the other end of the fourth resistor R4 is electrically connected to the CC2 pin in the fast charging unit 2022, and any point on the connection line between the other end of the fourth resistor R4 and the CC2 pin in the fast charging unit 2022 can be determined as the second detection point.

[0066] In this optional embodiment, optionally, when the charging mode of the charging system is a DC charging mode, the auxiliary power supply terminal (A+ pin and A- pin) is used to output a wake-up voltage to wake up the vehicle distribution box module 202 and the power battery module 204, and the first communication terminal (Charge CANH pin and Charge CANL pin) is used to perform DC communication with the vehicle distribution box module 202 and the power battery module 204, and when the current output terminal of the AC / DC charging gun module 101 is initially connected to the current input terminal of the vehicle charging seat module 201, at this time, the current output terminal of the AC / DC charging gun module 101 is connected to the current input terminal of the vehicle charging seat module 201 but is not powered on, and the voltage of the first external power supply electrically connected U1 is divided by the first resistor R1 and the second resistor R2. At this time, the first detection voltage of the first detection point is the first voltage, for example, 6V, and the second external power supply electrically connected U2 is powered by the fourth resistor R4. When the power battery module 204 is awakened, the second detection voltage of the second detection point is the second voltage, for example, 12V.

[0067] In this optional embodiment, optionally, when the charging mode of the charging system is a DC charging mode, and when the current output end of the AC / DC charging gun module 101 is connected to the current input end of the vehicle charging seat module 201, the current output end of the AC / DC charging gun module 101 is connected to the current input end of the vehicle charging seat module 201 and is powered on, and the voltage of the first external power supply electrical connection U1 is divided by the first resistor R1, the second resistor R2 and the third resistor R3. At this time, the first detection voltage of the first detection point is the third voltage, 4V, and the second detection voltage of the second detection point is the fourth voltage, 6V, that is: the charging pile end can judge whether the connection between the charging gun and the charging seat is completed through the CC1 pin and the voltage of the first detection point, and the power battery module can judge the connection status of the charging gun and the charging seat through the voltage of the second detection point.

[0068] In yet another optional embodiment, Figure 3 As shown, the second low-voltage connector K2 includes a second communication terminal and a third charging connection confirmation terminal, wherein:

[0069] When the charging mode of the charging system is the AC charging mode, the second communication end is used to wake up the vehicle distribution box module 202 and the power battery module 204, and perform AC communication with the vehicle distribution box module 202 and the power battery module 204, and when the current output end of the AC / DC charging gun module 101 is initially connected to the current input end of the vehicle charging seat module 201, the third detection voltage of the third charging connection confirmation end is the fifth voltage;

[0070] When the charging mode of the charging system is the AC charging mode, and when the current output end of the AC / DC charging gun module 101 is connected to the current input end of the vehicle charging seat module 201, the third detection voltage of the third charging connection confirmation end is the sixth voltage.

[0071] In this optional embodiment, optionally, the AC charging unit 1012 includes a second low-voltage connector K2, an L1 pin, an L2 pin, an L3 pin and an N pin, the second low-voltage connector K2 includes a second communication terminal (CC pin) and a third charging connection confirmation terminal (CP pin), and the second low-voltage connector K2 also includes a PE pin. When the charging mode of the charging system is the AC charging mode, the vehicle distribution box module 202 and the power battery module 204 are awakened by the CC pin. At this time, the third detection voltage of the CP pin is the fifth voltage, that is, the normal power 12V. When the charging mode of the charging system is the AC charging mode, and when the current output terminal of the AC / DC charging gun module 101 is connected to the current input terminal of the vehicle charging seat module 201, the third detection voltage of the CP pin is the sixth voltage, that is, a 6V duty cycle signal, and the output power of the charging line is transmitted to the on-board charger module 203 through the duty cycle signal.

[0072] In another optional embodiment, when the charging mode of the charging system is the AC charging mode, and when the current output end of the AC / DC charging gun module 101 is connected to the current input end of the vehicle charging seat module 201, the on-board charger module 203 is used to determine the AC output power of the AC charging unit 1012, the main body output power of the on-board charger module 203 and the requested output power of the power battery module 204, and determine the minimum current value based on the AC output power, the main body output power and the requested output power, and convert the AC current into the converted DC current based on the minimum current value.

[0073] In this optional embodiment, optionally, when the charging mode of the charging system is the AC charging mode, and when the current output end of the AC / DC charging gun module 101 is connected to the current input end of the vehicle charging seat module 201, the third detection voltage of the CP pin is the sixth voltage, that is, a 6V duty cycle signal, and the output power of the charging line is transmitted to the on-board charger module 203 through the duty cycle signal. The on-board charger module 203 determines the minimum current value based on the AC output power of the AC charging unit 1012, the main output power of the on-board charger module 203, and the requested output power of the power battery module 204, and converts the AC current into a converted DC current according to the minimum current value.

[0074] The working principle of the AC / DC integrated charging system in the embodiment of the present invention is as follows:

[0075] In the embodiment of the present invention, when it is necessary to charge the vehicle, the AC / DC charging gun module at the charging pile end is inserted into the vehicle charging seat module at the vehicle end; when it is necessary to fast charge the vehicle (i.e. DC charging), the vehicle charging seat module is electrically connected to the fast charging unit through the charging mode switching switch in the vehicle distribution box module. At this time, the charging current direction of the DC current of the charging system is: AC charging unit-vehicle charging seat module-charging mode switching switch-fast charging unit-power battery module; when it is necessary to perform standard charging of the vehicle (i.e. AC charging), the vehicle charging seat module is electrically connected to the slow charging unit through the charging mode switching switch in the vehicle distribution box module. At this time, the charging current direction of the AC current of the charging system is: AC charging unit-vehicle charging seat module-charging mode switching switch-slow charging unit-on-board charger module (converting AC current into DC current)-power battery module. It can be seen that the AC / DC integrated charging system can integrate the DC plug and AC plug into an integrated plug through the AC / DC charging gun module. Only one charging port is required for AC and DC charging, which reduces the cost of the entire vehicle. At the same time, the vehicle distribution box module can realize fast and flexible switching between fast charging and slow charging, reduce the complexity of switching between fast and slow charging, speed up the charging time, and thus improve the charging efficiency.

[0076] Embodiment 2

[0077] See also Figure 4 As shown, Figure 4 As shown, Figure 4 is a schematic diagram of the structure of an AC / DC integrated charging plug disclosed in an embodiment of the present invention. Figure 4 As shown, the charging plug includes an AC / DC charging gun module as in any one, two or three embodiments in Embodiment 1. It should be noted that for a detailed description of the AC / DC charging gun module, please refer to the specific description of the relevant content in Embodiment 1, which will not be repeated in this embodiment.

[0078] In the embodiment of the present invention, optionally, the charging plug includes a dust cover, a DC+ charging cable, a DC- charging cable, and a low-voltage connector harness, that is, a low-voltage plug-in.

[0079] In the embodiment of the present invention, optionally, Figure 5 As shown, Figure 5 is a schematic diagram of the structure of another AC / DC integrated charging plug disclosed in an embodiment of the present invention. Figure 5 As shown, the charging plug includes positive and negative power pins (DC+ pin and DC- pin), positive and negative auxiliary power pins (A+ pin and A- pin) and low voltage connector pins, that is, Figure 5 Among them, (3) and (4) are the outlet pins, and the number of pins of the charging plug includes 14 pins.

[0080] In the embodiment of the present invention, optionally, Figure 5 As shown, the charging head model of the charging plug includes the European standard REMA320, and the standard charging current of the charging plug includes 320A.

[0081] It can be seen that implementation Figure 4 The described AC / DC integrated charging plug can integrate the DC plug and the AC plug into an integrated plug. Only one charging port is needed for AC and DC charging, which reduces the cost of the whole vehicle. At the same time, it improves the flexibility of switching between fast and slow charging, increases the charging power, and thus improves the charging efficiency.

[0082] The above is a detailed introduction to an AC / DC integrated charging system and a charging plug disclosed in an embodiment of the present invention. Specific embodiments are used in this article to illustrate the principles and implementation methods of the present invention, but the above preferred embodiments are not used to limit the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for a person skilled in the art, according to the idea of ​​the present invention, without departing from the spirit and scope of the present invention, there will be changes in the specific implementation method and the scope of application. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. An AC / DC integrated charging system, characterized in that: The charging system includes a charging pile end and a vehicle end, wherein the charging pile end includes an AC / DC charging gun module, and the vehicle end includes a vehicle charging seat module, a vehicle power distribution box module, an on-board charger module, and a power battery module, wherein: One end of the vehicle charging seat module is electrically connected to one end of the vehicle power distribution box module, and the other end of the vehicle power distribution box module is electrically connected to one end of the vehicle charger module and one end of the power battery module respectively, and the other end of the vehicle charger module is electrically connected to the other end of the power battery module. When the vehicle end needs to be charged through the charging pile end, the current output end of the AC / DC charging gun module is used to be electrically connected to the current input end of the vehicle charging seat module; When the vehicle end needs to be charged with DC through the charging pile end, the vehicle distribution box module is used to switch the charging mode of the charging system to the DC charging mode, the AC / DC charging gun module is used to provide DC current to the vehicle end, and the vehicle charging seat module and the vehicle distribution box module are used to transmit the DC current to the power battery module; When the vehicle end needs to be charged with AC through the charging pile end, the vehicle distribution box module is used to switch the charging mode of the charging system to the AC charging mode, the AC / DC charging gun module is used to provide AC current to the vehicle end, the vehicle charging seat module and the vehicle distribution box module are used to transmit the AC current to the on-board charger module, and the on-board charger module is used to convert the AC current into a converted DC current and transmit the converted DC current to the power battery module.

2. The AC / DC integrated charging system according to claim 1, characterized in that: The AC / DC charging gun module includes a DC charging unit and an AC charging unit, and the vehicle power distribution box module includes a charging mode switch, a fast charging unit and a slow charging unit, wherein: When the vehicle end needs to be charged through the charging pile end, the DC output end of the DC charging unit and the AC output end of the AC charging unit are electrically connected to the current input end of the vehicle charging seat module respectively, and one end of the charging mode switching switch is electrically connected to one end of the vehicle charging seat module; When the vehicle end needs to be DC charged through the charging pile end, the other end of the charging mode switch is used to be electrically connected to one end of the fast charging unit to implement the operation of switching the charging mode of the charging system to the DC charging mode, and the other end of the fast charging unit is electrically connected to one end of the power battery module; When the vehicle end needs to be charged with AC through the charging pile end, the other end of the charging mode switch is used to be electrically connected to one end of the slow charging unit to implement the operation of switching the charging mode of the charging system to the AC charging mode, and the other end of the slow charging unit is electrically connected to one end of the on-board charger module; The DC charging unit is used to provide the DC current to the vehicle end, and the AC charging unit is used to provide the AC current to the vehicle end.

3. The AC / DC integrated charging system according to claim 2, characterized in that: The DC charging unit includes a first low-voltage connector, the AC charging unit includes a second low-voltage connector, and the vehicle charging seat module includes a third low-voltage connector and a fourth low-voltage connector, wherein: When the vehicle end needs to be charged through the charging pile end, the first low-voltage connector is electrically connected to one end of the third low-voltage connector, the second low-voltage connector is electrically connected to one end of the fourth low-voltage connector, and the other end of the third low-voltage connector and the other end of the fourth low-voltage connector are electrically connected to one end of the charging mode switching switch respectively; When the charging mode of the charging system is the DC charging mode, the first low-voltage connector is used to perform DC communication with the vehicle distribution box module and the power battery module through the third low-voltage connector. When the charging mode of the charging system is the AC charging mode, the second low-voltage connector is used to perform AC communication with the vehicle distribution box module and the power battery module through the fourth low-voltage connector.

4. The AC / DC integrated charging system according to claim 3, characterized in that: The DC charging unit further includes a first resistor and a second resistor, the vehicle charging seat module includes a third resistor, the power battery module includes a fourth resistor, the first low-voltage connector includes an auxiliary power supply terminal, a first communication terminal and a first charging connection confirmation terminal, and the third low-voltage connector includes a second charging connection confirmation terminal, wherein: One end of the first resistor is used to be electrically connected to a first external power supply, the other end of the first resistor is electrically connected to one end of the second resistor, the other end of the second resistor is electrically connected to the charging connection confirmation end, the other end of the second resistor is also used to be grounded, the third resistor is electrically connected to the second charging connection confirmation end, one end of the fourth resistor is used to be electrically connected to a second external power supply, and the other end of the fourth resistor is electrically connected to the other end of the fast charging unit; When the charging mode of the charging system is the DC charging mode, the auxiliary power supply end is used to output a wake-up voltage to wake up the vehicle distribution box module and the power battery module, the first communication end is used to perform DC communication with the vehicle distribution box module and the power battery module, and when the current output end of the AC / DC charging gun module is initially connected to the current input end of the vehicle charging seat module, the first detection voltage of the other end of the first resistor is the first voltage, and the second detection voltage of the other end of the fourth resistor is the second voltage; When the charging mode of the charging system is the DC charging mode, and when the current output end of the AC / DC charging gun module is connected to the current input end of the vehicle charging seat module, the first detection voltage at the other end of the first resistor is the third voltage, and the second detection voltage at the other end of the fourth resistor is the fourth voltage.

5. The AC / DC integrated charging system according to claim 3 or 4, characterized in that: The second low-voltage connector includes a second communication terminal and a third charging connection confirmation terminal, wherein: When the charging mode of the charging system is the AC charging mode, the second communication end is used to wake up the vehicle distribution box module and the power battery module, and perform AC communication with the vehicle distribution box module and the power battery module, and when the current output end of the AC / DC charging gun module is initially connected to the current input end of the vehicle charging seat module, the third detection voltage of the third charging connection confirmation end is the fifth voltage; When the charging mode of the charging system is the AC charging mode, and when the current output end of the AC / DC charging gun module is connected to the current input end of the vehicle charging seat module, the third detection voltage of the third charging connection confirmation end is the sixth voltage.

6. The AC / DC integrated charging system according to any one of claims 2 to 4, characterized in that: When the charging mode of the charging system is the AC charging mode, and when the current output end of the AC / DC charging gun module is connected to the current input end of the vehicle charging seat module, the on-board charger module is used to determine the AC output power of the AC charging unit, the main body output power of the on-board charger module and the requested output power of the power battery module, and determine the minimum current value according to the AC output power, the main body output power and the requested output power, and convert the AC current into the converted DC current according to the minimum current value.

7. The AC / DC integrated charging system according to any one of claims 1 to 4, characterized in that: The charging protocol between the charging pile end and the vehicle end includes the national standard GBT27930-2015 charging protocol.

8. An AC / DC integrated charging plug, the charging plug comprising an AC / DC charging gun module according to any one of claims 1 to 7, wherein: The charging plug includes positive and negative power pins, positive and negative auxiliary power pins and low-voltage connector pins, and the number of pins of the charging plug includes 14 pins.

9. The AC / DC integrated charging plug according to claim 8, characterized in that: The charging head model of the charging plug includes the European standard REMA320.

10. The AC / DC integrated charging plug according to claim 8 or 9, characterized in that: The standard charging current of the charging plug includes 320A.

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