An AC / DC integrated charging system and charging plug

Abstract

This invention relates to the field of electric vehicle charging technology and discloses an AC / DC integrated charging system and charging plug. The AC / DC integrated 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 socket module, a vehicle power distribution box module, an on-board charger module, and a power battery module. The vehicle power distribution box module is used to switch the charging mode of the charging system, and the AC / DC charging gun module is used to provide AC current or DC current to the vehicle end according to the charging mode of the charging system. It can integrate DC plug and AC plug into a single plug, requiring only one charging port for AC and DC charging, overcoming the layout limitations of existing AC / DC charging ports, reducing the overall vehicle cost, and enabling fast and flexible switching between fast and slow charging through the vehicle power distribution box module, reducing the complexity of fast and slow charging switching, accelerating charging time, and thus improving charging efficiency.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging technology, and in particular to an AC / DC integrated charging system and charging plug. Background Technology

[0002] With the rapid development of power batteries, not only has the popularization of new energy passenger cars been facilitated, but it has also provided 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 advantages such as environmental protection and energy saving, simple maintenance and easy intelligent control.

[0003] Currently, most electric excavators in the industry only support a single AC or DC charging mode, which limits their operational capabilities in different environments. Furthermore, the compact internal space of excavators makes it difficult for traditional designs to simultaneously accommodate standard and fast charging interfaces, resulting in low charging efficiency. Therefore, proposing a technical solution that can overcome the limitations of existing AC / DC charging port layouts and improve charging efficiency and flexibility is particularly important. 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 charging plug, which can overcome the layout limitations of existing AC / DC charging ports and improve charging efficiency and flexibility.

[0005] To address the aforementioned technical problems, the first aspect of this 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 socket module, a vehicle power distribution box module, an on-board charger module, and a power battery module, wherein:

[0006] One end of the vehicle charging dock 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 on-board charger module and one end of the power battery module. The other end of the on-board charger module is electrically connected to the other end of the power battery module. When the vehicle needs to be charged through the charging pile, the current output terminal of the AC / DC charging gun module is electrically connected to the current input terminal of the vehicle charging dock module.

[0007] When it is necessary to DC charge the vehicle through the charging pile, the vehicle power distribution box module is used to switch the charging mode of the charging system to DC charging mode, the AC / DC charging gun module is used to provide DC current to the vehicle, and the vehicle charging base module and the vehicle power distribution box module are used to transmit the DC current to the power battery module.

[0008] When AC charging of the vehicle is required via the charging pile, the vehicle power distribution box module switches the charging mode of the charging system to AC charging mode. The AC / DC charging gun module provides AC current to the vehicle. The vehicle charging dock module and the vehicle power distribution box module transmit the AC current to the on-board charger module. The on-board charger module converts the AC current into DC current and transmits the 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 switching switch, a fast charging unit, and a slow charging unit, wherein:

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

[0011] When it is necessary to DC charge the vehicle through the charging pile, the other end of the charging mode switching switch is used to electrically connect to one end of the fast charging unit to realize the operation of switching the charging mode of the charging system to DC charging mode. The other end of the fast charging unit is electrically connected to one end of the power battery module.

[0012] When AC charging of the vehicle is required through the charging pile, the other end of the charging mode switching switch is electrically connected to one end of the slow charging unit to realize the operation of switching the charging mode of the charging system to AC charging mode. 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, and the AC charging unit is used to provide the AC current to the vehicle.

[0014] As an optional implementation, in a first aspect of the 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 dock module includes a third low-voltage connector and a fourth low-voltage connector, wherein:

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

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

[0017] As an optional implementation, in the first aspect of the present invention, the DC charging unit further includes a first resistor and a second resistor, the vehicle charging dock module includes a third resistor, the power battery module includes a fourth resistor, the first low-voltage connector includes an auxiliary power 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 the 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 terminal, 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 terminal, one end of the fourth resistor is used to be electrically connected to the 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 terminal is used to output a wake-up voltage to wake up the vehicle power distribution box module and the power battery module. The first communication terminal is used to communicate with the vehicle power distribution box module and the power battery module via DC. When the current output terminal of the AC / DC charging gun module is initially connected to the current input terminal of the vehicle charging socket module, the first detection voltage at the other end of the first resistor is the first voltage, and the second detection voltage at 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 terminal of the AC / DC charging gun module is connected to the current input terminal of the vehicle charging socket 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 a first aspect of the 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 terminal is used to wake up the vehicle power distribution box module and the power battery module, and to communicate with the vehicle power distribution box module and the power battery module via AC. When the current output terminal of the AC / DC charging gun module is initially connected to the current input terminal of the vehicle charging socket module, the third detection voltage of the third charging connection confirmation terminal is the fifth voltage.

[0023] 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 is connected to the current input terminal of the vehicle charging socket module, the third detection voltage of the third charging connection confirmation terminal is the sixth voltage.

[0024] As an optional implementation, 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 terminal of the AC / DC charging gun module is connected to the current input terminal of the vehicle charging socket module, the on-board charger module is used to determine the AC output power of the AC charging unit, the main output power of the on-board charger module, and the requested output power of the power battery module, and determine a minimum current value based on the AC output power, the main 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 and the vehicle 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 as described in any one of the first aspects of the present invention, wherein the charging plug includes positive and negative power supply pins, positive and negative auxiliary power supply pins and low voltage connector pins, and the number of pins of the charging plug includes 14 pins.

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

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

[0029] Implementing this invention has the following beneficial effects:

[0030] This invention provides an AC / DC integrated charging system, comprising a charging pile and a vehicle. The charging pile includes an AC / DC charging gun module, and the vehicle includes a vehicle charging dock module, a vehicle power distribution box module, an on-board charger module, and a power battery module. One end of the vehicle charging dock 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 both the on-board charger module and the power battery module. The other end of the on-board charger module is electrically connected to the other end of the power battery module. When charging the vehicle via the charging pile, the current output terminal of the AC / DC charging gun module is electrically connected to the current input terminal of the vehicle charging dock module; when charging via the charging pile... When the charging station provides DC charging to the vehicle, the vehicle's power distribution box module switches the charging system to DC charging mode. The AC / DC charging gun module provides DC current to the vehicle, and the vehicle charging socket module and power distribution box module transmit the DC current to the power battery module. When AC charging is required via the charging station, the vehicle's power distribution box module switches the charging system to AC charging mode. The AC / DC charging gun module provides AC current to the vehicle, and the vehicle charging socket module and power distribution box module transmit the AC current to the on-board charger module. The on-board charger module converts the AC current into a converted DC current and transmits the converted DC current to the power battery module. Therefore, this invention integrates the DC and AC plugs into a single plug using the AC / DC charging gun module. Only one charging port is needed for both AC and DC charging, overcoming the layout limitations of existing AC / DC charging ports and reducing overall vehicle cost. Simultaneously, the vehicle's power distribution box module enables rapid and flexible switching between fast and slow charging, reducing the complexity of fast / slow charging switching, accelerating charging time, and thus improving charging efficiency. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] 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;

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

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

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

[0036] Figure 5 This is a schematic diagram of another AC / DC integrated charging plug disclosed in an embodiment of the present invention. Detailed Implementation

[0037] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0038] It should be noted that, unless otherwise explicitly specified and limited, the term "electrical connection" in the specification, claims, and accompanying drawings of this invention should be interpreted broadly. For example, it can refer to 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 a connection capable of communication; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal connection of two elements or the interaction between two elements. Furthermore, the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Example 1

[0040] Please see Figure 1 , Figure 1 This is a schematic diagram of an AC / DC integrated charging system disclosed in an embodiment of the present invention. This charging system can be applied to any vehicle requiring AC and / or DC charging, including but not limited to new energy vehicles, new energy excavators, and new energy bulldozers. The embodiments of the present invention do not impose limitations. Figure 1 As shown, the AC / DC integrated charging system includes a charging pile terminal 10 and a vehicle terminal 20. The charging pile terminal 10 includes an AC / DC charging gun module 101, and the vehicle terminal 20 includes a vehicle charging socket module 201, a vehicle power distribution box module 202, an on-board charger module 203, and a power battery module 204, wherein:

[0041] One end of the vehicle charging dock module 201 is electrically connected to one end of the vehicle power distribution box module 202. The other end of the vehicle power distribution box module 202 is electrically connected to one end of the on-board charger module 203 and one end of the power battery module 204. The other end of the on-board charger module 203 is electrically connected to the other end of the power battery module 204. When it is necessary to charge the vehicle terminal 20 through the charging pile terminal 10, the current output terminal of the AC / DC charging gun module 101 is used to be electrically connected to the current input terminal of the vehicle charging dock module 201.

[0042] When it is necessary to DC charge the vehicle terminal 20 through the charging pile terminal 10, the vehicle power 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 terminal 20, and the vehicle charging socket module 201 and the vehicle power distribution box module 202 are used to transmit the DC current to the power battery module 204.

[0043] When AC charging of vehicle 20 is required via charging pile 10, vehicle power distribution box module 202 switches the charging mode of the charging system to AC charging mode, AC / DC charging gun module 101 provides AC current to vehicle 20, vehicle charging base module 201 and vehicle power distribution box module 202 transmit AC current to on-board charger module 203, on-board charger module 203 converts AC current into DC current and transmits the DC current to power battery module 204.

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

[0045] In this embodiment of the invention, optionally, the vehicle end 20 may include a vehicle charging dock module 201, a vehicle power distribution box module 202, an on-board charger module 203, and a power battery module 204 integrated on the vehicle. The vehicle may include civilian electric vehicles, electric construction machinery vehicles, etc. Specifically, it may include one or more of electric construction transport vehicles, electric cranes, electric excavators, electric bulldozers, electric road rollers, electric loaders, electric emergency rescue vehicles, electric trailers, etc. The invention does not limit the scope of the invention.

[0046] In this embodiment of the invention, optionally, the AC / DC charging gun module 101 and the vehicle charging dock module 201 can be pluggably connected. When it is necessary to DC charge the vehicle 20 through the charging pile terminal 10, the charging mode of the charging system is switched to DC charging mode through the vehicle power distribution box module 202, and the charging gun on the charging pile terminal 10 is inserted into the vehicle terminal, that is, the AC / DC charging gun module 101 is inserted into the vehicle charging dock module 201, so that the AC / DC charging gun module 101 and the vehicle charging dock module 201 are electrically connected. The AC / DC charging gun module 101 provides DC current to the vehicle 20, and the vehicle charging dock module 201 and the vehicle power distribution box module 202 transmit the DC current to the power battery module 204 to realize DC charging of the vehicle power battery.

[0047] In this embodiment of the invention, optionally, when AC charging of vehicle 20 is required via charging pile 10, the charging mode of the charging system is switched to AC charging mode via vehicle power distribution box module 202, AC current is provided to vehicle 20 via AC / DC charging gun module 101, vehicle charging base module 201 and vehicle power distribution box module 202 transmit AC current to on-board charger module 203, on-board charger module 203 converts AC current into DC current and transmits the DC current to power battery module 204, thereby realizing AC charging of vehicle power battery.

[0048] It is evident that implementation Figure 1 The described AC / DC integrated charging system can integrate DC and AC plugs into a single plug through the AC / DC charging gun module. AC and DC charging only require one charging port, overcoming the layout limitations of existing AC / DC charging ports, reducing the overall vehicle cost. At the same time, the vehicle power distribution box module enables fast and flexible switching between fast and slow charging, reducing the complexity of fast and slow charging switching, speeding up charging time, and thus improving charging efficiency.

[0049] In an optional embodiment, such as Figure 2 As shown, Figure 2 This is a schematic diagram of another AC / DC integrated charging system disclosed in an embodiment of the present invention, as shown below. 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 power distribution box module 202 includes a charging mode switching switch 2021, a fast charging unit 2022, and a slow charging unit 2023, wherein:

[0050] When it is necessary to charge the vehicle terminal 20 through the charging pile terminal 10, the DC output terminal of the DC charging unit 1011 and the AC output terminal of the AC charging unit 1012 are electrically connected to the current input terminal of the vehicle charging base module 201, and one end of the charging mode switching switch 2021 is electrically connected to one end of the vehicle charging base module 201.

[0051] When it is necessary to DC charge the vehicle terminal 20 through the charging pile terminal 10, the other end of the charging mode switching switch 2021 is used to electrically connect to one end of the fast charging unit 2022 to realize the operation of switching the charging mode of the charging system to the DC charging mode. The other end of the fast charging unit 2022 is electrically connected to one end of the power battery module 204.

[0052] When AC charging of vehicle 20 is required via charging pile terminal 10, the other end of charging mode switching switch 2021 is electrically connected to one end of slow charging unit 2023 to switch the charging mode of the charging system to AC charging mode. The other end of slow charging unit 2023 is electrically connected to one end of on-board charger module 203.

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

[0054] In this optional embodiment, the AC / DC charging gun module and the vehicle charging dock module can be pluggably connected. When the charging gun on the charging pile is inserted into the vehicle, that is, when the AC / DC charging gun module and the vehicle charging dock module are electrically connected, the DC charging unit and the AC charging unit are simultaneously inserted into the vehicle charging dock module. When DC charging of the vehicle is required through the charging pile, 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 AC charging of the vehicle is required through the charging pile, 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 or moving the corresponding switch lever.

[0055] In this optional embodiment, optionally, such as Figure 3 As shown, Figure 3 This is a schematic diagram of another AC / DC integrated charging system disclosed in an embodiment of the present invention, as shown below. Figure 3As shown, the charging mode switching switch 2021 includes five switching pins: DC+, DC-, CC1, CC2, and PE. When DC charging of the vehicle 20 is required via the charging pile 10, the five switching pins of the charging mode switching switch 2021 are adjusted to electrically connect with the corresponding pins in the fast charging unit 2022. The fast charging unit 2022 includes DC+, DC-, CAN+, CAN-, A+, A-, CC2, and PE pins. The pins corresponding to the charging mode switch 2021 in the fast charging unit 2022 include the DC+ pin, DC- pin, CC2 pin, and PE pin. When AC charging of the vehicle terminal 20 is required through the charging pile terminal 10, the five switch pins of the charging mode switch 2021 are adjusted to electrically connect with the pins corresponding to the charging mode switch 2021 in the slow charging unit 2023. The pins corresponding to the charging mode switch 2021 in the slow charging unit 2023 include the L1 pin, N pin, CC pin, CP pin, and PE pin.

[0056] In another alternative embodiment, such as 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 dock module 201 includes a third low-voltage connector K3 and a fourth low-voltage connector K4, wherein:

[0057] When it is necessary to charge the vehicle terminal 20 through the charging pile terminal 10, one end of the first low-voltage connector K1 is electrically connected to one end of the third low-voltage connector K3, one end of 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 respectively electrically connected to one end of the charging mode switching switch 2021.

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

[0059] In this optional embodiment, the DC charging unit 1011 optionally 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 with the pins of the first low-voltage connector K1. When the charging mode of the charging system is DC charging mode, the first low-voltage connector K1 is used to communicate DC with the vehicle power distribution box module 202 and the power battery module 204 through the third low-voltage connector K3. Specifically, this includes: waking up the communication modules of the vehicle power 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 power 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, the third low-voltage connector K3 may include a PE pin, a CC pin, and a CP pin. When the charging mode of the charging system is AC charging mode, the second low-voltage connector K2 is used to communicate with the vehicle power distribution box module 202 and the power battery module 204 via the fourth low-voltage connector K4. Specifically, this includes: waking up the vehicle power distribution box module 202 and the power battery module 204 via the CC pin of the third low-voltage connector K3, and then communicating with the vehicle power distribution box module 202 and the power battery module 204 via the CP pin of the third low-voltage connector K3.

[0061] In yet another alternative embodiment, such as Figure 3 As shown, the DC charging unit 1011 also includes a first resistor R1 and a second resistor R2, the vehicle charging dock 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 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 terminal, and the other end of the second resistor R2 is also used for grounding; the third resistor R3 is electrically connected to the second charging connection confirmation terminal; 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 DC charging mode, the auxiliary power supply terminal is used to output a wake-up voltage to wake up the vehicle power distribution box module 202 and the power battery module 204. The first communication terminal is used to communicate with the vehicle power distribution box module 202 and the power battery module 204 via DC. 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 socket module 201, the first detection voltage at the other end of the first resistor R1 is the first voltage, and the second detection voltage at the other end of the fourth resistor R4 is the second voltage.

[0064] When the charging mode of the charging system is DC 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 socket 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, the DC charging unit 1011 may also include a charging pile controller. The first external power supply connection U1 may include an AC power supply. The other end of the first resistor R1 is also electrically connected to the charging pile controller. 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 connection U2 may be the internal power supply of the power battery module. 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. 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, when the charging mode of the charging system is 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 power distribution box module 202 and the power battery module 204. The first communication terminal (Charge CANH pin and Charge CANL pin) is used to communicate with the vehicle power distribution box module 202 and the power battery module 204 via DC. 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 socket module 201, the current output terminal of the AC / DC charging gun module 101 is connected to the current input terminal of the vehicle charging socket module 201 but is not powered on. The voltage of the first external power supply connection 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. The second external power supply connection U2 is powered by the fourth resistor R4. When the power battery module 204 is woken up, the second detection voltage of the second detection point is the second voltage, for example, 12V.

[0067] In this optional embodiment, when the charging mode of the charging system is DC 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 dock module 201, the current output terminal of the AC / DC charging gun module 101 is connected to the current input terminal of the vehicle charging dock module 201 and is already powered on. The voltage of the first external power supply 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 determine whether the charging gun and the charging dock are connected by the CC1 pin and the voltage of the first detection point, and the power battery module can determine the connection status of the charging gun and the charging dock by the voltage of the second detection point.

[0068] In yet another alternative embodiment, such as 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 AC charging mode, the second communication terminal is used to wake up the vehicle power distribution box module 202 and the power battery module 204, and to communicate with the vehicle power distribution box module 202 and the power battery module 204 via AC. 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 socket module 201, the third detection voltage of the third charging connection confirmation terminal is the fifth voltage.

[0070] When the charging mode of the charging system is 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 socket module 201, the third detection voltage of the third charging connection confirmation terminal is the sixth voltage.

[0071] In this optional embodiment, the AC charging unit 1012 optionally includes a second low-voltage connector K2, L1 pin, L2 pin, L3 pin, and N pin. The second low-voltage connector K2 includes a second communication terminal (CC pin) and a third charging connection confirmation terminal (CP pin). The second low-voltage connector K2 also includes a PE pin. When the charging mode of the charging system is AC charging mode, the vehicle power distribution box module 202 and the power battery module 204 are woken up through the CC pin. At this time, the third detection voltage of the CP pin is the fifth voltage, i.e., constant 12V. When the charging mode of the charging system is 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 socket module 201, the third detection voltage of the CP pin is the sixth voltage, i.e., a 6V duty cycle signal, and the output power of the charging cable 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 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 socket module 201, the on-board charger module 203 is used to determine the AC output power of the AC charging unit 1012, the on-board charger module 203 itself, and the requested output power of the power battery module 204, and determine the minimum current value based on the AC output power, the on-board charger module 203 itself, and the requested output power, and convert the AC current into a converted DC current based on the minimum current value.

[0073] In this optional embodiment, when the charging mode of the charging system is 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 socket module 201, the third detection voltage of the CP pin is the sixth voltage, i.e., a 6V duty cycle signal. The output power of the charging cable 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 output power of the on-board charger module 203 itself, and the requested output power of the power battery module 204. The AC current is converted into a DC current according to the minimum current value.

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

[0075] In this embodiment of the invention, when charging the vehicle, the AC / DC charging gun module at the charging pile end is inserted into the vehicle charging socket module at the vehicle end. When fast charging (i.e., DC charging) is required, the vehicle charging socket module is electrically connected to the fast charging unit via the charging mode switching switch in the vehicle power distribution box module. At this time, the DC charging current flow of the charging system is: AC charging unit - vehicle charging socket module - charging mode switching switch - fast charging unit - power battery module. When standard charging (i.e., AC charging) is required, the vehicle charging socket module is electrically connected to the slow charging unit via the charging mode switching switch in the vehicle power distribution box module. At this time, the AC charging current flow of the charging system is: AC charging unit - vehicle charging socket module - charging mode switching switch - slow charging unit - on-board charger module (converting AC current to DC current) - power battery module. As can be seen, this AC / DC integrated charging system can integrate the DC plug and AC plug into a single plug through the AC / DC charging gun module. AC and DC charging only require one charging port, which reduces the overall vehicle cost. At the same time, the vehicle power distribution box module enables fast and flexible switching between fast and slow charging, reducing the complexity of fast and slow charging switching, speeding up charging time, and thus improving charging efficiency.

[0076] Example 2

[0077] Please see Figure 4 As shown, Figure 4 As shown, Figure 4 This is a schematic diagram of the structure of an AC / DC integrated charging plug disclosed in an embodiment of the present invention, as shown below. Figure 4 As shown, the charging plug includes an AC / DC charging gun module as described in any one, two, or three of the 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 in Embodiment 1; this embodiment will not repeat it.

[0078] In this embodiment of the invention, optionally, the charging plug includes a dust cover, a DC+ charging cable, a DC- charging cable, and a low-voltage connector harness, i.e., a low-voltage plug.

[0079] In this embodiment of the invention, optionally, such as Figure 5 As shown, Figure 5 This is a schematic diagram of another AC / DC integrated charging plug disclosed in an embodiment of the present invention, as shown below. 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, i.e. Figure 5 The charging plug has 14 pins, with pins (3) and (4) being the outlet pins.

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

[0081] It is evident that implementation Figure 4 The described AC / DC integrated charging plug integrates DC and AC plugs into a single plug, requiring only one charging port for both AC and DC charging. This reduces the overall vehicle cost, while also improving the flexibility of switching between fast and slow charging, increasing charging power, and thus improving charging efficiency.

[0082] The above provides a detailed description of an AC / DC integrated charging system and charging plug disclosed in the embodiments of the present invention. Specific embodiments have been used to illustrate the principles and implementation methods of the present invention. However, the above preferred embodiments are not intended to limit the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope defined in the claims.

Claims

1. An AC / DC integrated charging system, characterized in that, The charging system includes a charging pile terminal and a vehicle terminal. The charging pile terminal includes an AC / DC charging gun module, and the vehicle terminal includes a vehicle charging base module, a vehicle power distribution box module, an on-board charger module, and a power battery module, wherein: One end of the vehicle charging dock 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 on-board charger module and one end of the power battery module. The other end of the on-board charger module is electrically connected to the other end of the power battery module. When the vehicle needs to be charged through the charging pile, the current output terminal of the AC / DC charging gun module is electrically connected to the current input terminal of the vehicle charging dock module. When it is necessary to DC charge the vehicle through the charging pile, the vehicle power distribution box module is used to switch the charging mode of the charging system to DC charging mode, the AC / DC charging gun module is used to provide DC current to the vehicle, and the vehicle charging base module and the vehicle power distribution box module are used to transmit the DC current to the power battery module. When AC charging of the vehicle is required via the charging pile, the vehicle power distribution box module switches the charging mode of the charging system to AC charging mode, the AC / DC charging gun module provides AC current to the vehicle, the vehicle charging socket module and the vehicle power distribution box module transmit the AC current to the on-board charger module, and the on-board charger module converts the AC current into DC current and transmits the DC current to the power battery module. Furthermore, the AC / DC charging gun module includes a DC charging unit and an AC charging unit, the DC charging unit includes a first low-voltage connector, and the vehicle charging socket module includes a third low-voltage connector and a fourth low-voltage connector. Furthermore, the DC charging unit further includes a first resistor and a second resistor, the vehicle charging dock module includes a third resistor, the power battery module includes a fourth resistor, the first low-voltage connector includes an auxiliary power 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 the 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 first charging connection confirmation terminal, the other end of the second resistor is also used to ground, the third resistor is electrically connected to the second charging connection confirmation terminal, one end of the fourth resistor is used to be electrically connected to the 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 terminal is used to output a wake-up voltage to wake up the vehicle power distribution box module and the power battery module. The first communication terminal is used to communicate with the vehicle power distribution box module and the power battery module via DC. When the current output terminal of the AC / DC charging gun module is initially connected to the current input terminal of the vehicle charging socket module, the first detection voltage at the other end of the first resistor is the first voltage, and the second detection voltage at 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 terminal of the AC / DC charging gun module is connected to the current input terminal of the vehicle charging socket 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.

2. The AC / DC integrated charging system according to claim 1, characterized in that, The vehicle power distribution box module includes a charging mode switching switch, a fast charging unit, and a slow charging unit, wherein: When the vehicle needs to be charged through the charging pile, the DC output terminal of the DC charging unit and the AC output terminal of the AC charging unit are electrically connected to the current input terminal of the vehicle charging base module, and one end of the charging mode switching switch is electrically connected to one end of the vehicle charging base module. When it is necessary to DC charge the vehicle through the charging pile, the other end of the charging mode switching switch is used to electrically connect to one end of the fast charging unit to realize the operation of switching the charging mode of the charging system to DC charging mode. The other end of the fast charging unit is electrically connected to one end of the power battery module. When AC charging of the vehicle is required through the charging pile, the other end of the charging mode switching switch is electrically connected to one end of the slow charging unit to realize the operation of switching the charging mode of the charging system to AC charging mode. 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, and the AC charging unit is used to provide the AC current to the vehicle.

3. The AC / DC integrated charging system according to claim 2, characterized in that, The AC charging unit includes a second low-voltage connector, wherein: When the vehicle needs to be charged through the charging pile, 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 ends of the third low-voltage connector and the fourth low-voltage connector are respectively electrically connected to one end of the charging mode switching switch. When the charging mode of the charging system is the DC charging mode, the first low-voltage connector is used to communicate DC with the vehicle power 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 communicate AC with the vehicle power 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 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 terminal is used to wake up the vehicle power distribution box module and the power battery module, and to communicate with the vehicle power distribution box module and the power battery module via AC. When the current output terminal of the AC / DC charging gun module is initially connected to the current input terminal of the vehicle charging socket module, the third detection voltage of the third charging connection confirmation terminal is the fifth voltage. 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 is connected to the current input terminal of the vehicle charging socket module, the third detection voltage of the third charging connection confirmation terminal is the sixth voltage.

5. The AC / DC integrated charging system according to claim 2 or 3, characterized in that, 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 is connected to the current input terminal of the vehicle charging socket module, the on-board charger module is used to determine the AC output power of the AC charging unit, the main output power of the on-board charger module, and the requested output power of the power battery module, and determines the minimum current value based on the AC output power, the main output power, and the requested output power, and converts the AC current into the converted DC current based on the minimum current value.

6. The AC / DC integrated charging system according to any one of claims 1-3, characterized in that, The charging protocol between the charging pile and the vehicle includes the national standard GB / T27930-2015 charging protocol.

7. An AC / DC integrated charging plug, the charging plug comprising the AC / DC charging gun module as described in any one of claims 1-6, wherein, The charging plug includes positive and negative power supply pins, positive and negative auxiliary power supply pins, and low-voltage connector pins, and the charging plug has 14 pins.

8. The AC / DC integrated charging plug according to claim 7, characterized in that, The charging plug's charging head model includes the European standard REMA320.

9. The AC / DC integrated charging plug according to claim 7 or 8, characterized in that, The standard charging current of the charging plug includes 320A.

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