Direct current charging device for electric automobile

Abstract

The utility model discloses a direct-current charging device for an electric vehicle, relates to the technical field of direct-current charging, meets the requirements of large electric quantity, large current and megawatt-level fast charging, optimizes the heat dissipation performance, and improves the charging efficiency and safety. The charging device comprises an upper pantograph bracket and a lower pantograph bracket, the upper pantograph support is used for being electrically connected with a direct-current charging pile and can move up and down under driving of the air cylinder or the electric cylinder so as to make contact with the lower pantograph support to establish electrical connection or break contact to relieve electrical connection. The lower power receiving frame is used for being fixedly installed on the electric vehicle and electrically connected with a whole vehicle charging device of the electric vehicle.

Description

Technical Field

[0001] This application relates to the field of DC charging technology, and more particularly to a DC charging device for electric vehicles. Background Technology

[0002] Currently, most DC charging devices used in high-power electric vehicles such as electric trucks, mining trucks, and electric buses employ plug-in charging ports. While plug-in charging ports meet national standards (such as GB / T20234.4-2023), their energy carrying capacity is limited by physical constraints in terms of connection space and terminal contact size (the maximum current during actual charging can only reach about 600A), failing to meet the urgent needs of high-power electric vehicles for large capacity, high current, and megawatt-level fast charging. Furthermore, plug-in charging ports also have limitations in heat dissipation performance, further restricting their application in high-power DC charging scenarios. Utility Model Content

[0003] In view of the above problems, this application provides a DC charging device for electric vehicles to meet the needs of high capacity, high current, and megawatt-level fast charging, while optimizing heat dissipation performance and improving charging efficiency and safety. The specific solution is as follows:

[0004] This application provides a DC charging device for electric vehicles, including: an upper pantograph bracket and a lower charging frame;

[0005] The upper pantograph bracket is used for electrical connection with the DC charging pile and can move up and down under the drive of a cylinder or electric cylinder, so as to contact the lower pantograph frame to establish an electrical connection, or disconnect the contact to release the electrical connection.

[0006] The lower power receiving frame is used for fixed installation on the electric vehicle and is electrically connected to the vehicle's charging device.

[0007] In one possible implementation, the components constituting the upper pantograph support and the components constituting the lower pantograph frame both include: conductive components, insulating components, and load-bearing components;

[0008] The conductive components of the upper pantograph bracket include: 7 carbon plates, 7 copper plates, and 7 wires;

[0009] The insulating components of the upper pantograph support include: a first insulator and seven insulating plates;

[0010] The conductive components of the lower power receiving frame include: 7 electrode plates and 7 wires;

[0011] The insulating components of the lower power receiving frame include: a second insulator and seven insulating plates;

[0012] The i-th carbon plate, i-th copper plate, i-th wire, and i-th insulating plate of the upper pantograph bracket are assembled into the i-th electrode of the upper pantograph bracket by fasteners. The i-th copper plate of the upper pantograph bracket is stacked on top of the i-th carbon plate, and the i-th insulating plate is stacked on top of the i-th copper plate. The i-th wire of the upper pantograph bracket passes through the i-th insulating plate, with one end extending from above the i-th insulating plate and the other end connected to the i-th copper plate. i = 1, 2, 3, ..., 7. After the upper pantograph bracket moves down, the carbon plates of each electrode of the upper pantograph bracket are aligned with the corresponding electrode plates in the lower charging frame. Each wire of the upper pantograph bracket is also connected to the control cabinet of the DC charging pile. The supporting components of the upper pantograph bracket fix each electrode of the upper pantograph bracket through the first insulator.

[0013] The i-th electrode plate, the i-th wire, and the i-th insulating plate of the lower power receiving frame are all assembled into the i-th electrode by fasteners. The i-th electrode plate of the lower power receiving frame is stacked on top of the i-th insulating plate of the lower power receiving frame. The i-th wire of the lower power receiving frame passes through the i-th insulating plate of the lower power receiving frame, with one end passing out from under the i-th insulating plate of the lower power receiving frame and the other end connected to the i-th electrode plate of the lower power receiving frame. The wires of each electrode of the lower power receiving frame are also connected to the vehicle DC charging high-voltage control box of the vehicle charging device. The supporting components of the lower power receiving frame fix each electrode of the lower power receiving frame by the second insulator.

[0014] The seven electrodes of the upper pantograph bracket and the seven electrodes of the lower power receiving frame are respectively: grounding protection PE electrode, DC power supply DC+ electrode, DC power supply DC- electrode, charging connection confirmation CC1 electrode, charging connection confirmation CC2 electrode, charging communication S+ electrode, and charging communication S- electrode.

[0015] In one possible implementation, the contact sequence between the carbon plates of the upper pantograph support and the electrodes of the lower receiving frame is determined by the thickness of the carbon plates, with the thicker carbon plates contacting the corresponding electrodes first, wherein:

[0016] The PE carbon plate for grounding protection of the upper pantograph bracket is the thickest; the CC2 carbon plate for charging connection of the upper pantograph bracket is the second thickest; the DC+ and DC- carbon plates for DC power supply positive terminals of the upper pantograph bracket are the third thickest; the S+ and S- carbon plates for charging communication of the upper pantograph bracket are the fourth thickest; and the CC1 carbon plate for charging connection of the upper pantograph bracket is the thinnest.

[0017] In one possible implementation, the lower receiving frame further includes a spring; the spring is used to absorb the displacement generated during the docking process between the carbon plates of the upper pantograph support and the corresponding plates of the lower receiving frame through its own elastic deformation.

[0018] In one possible implementation, the carbon plates of the upper pantograph support are transverse rectangular carbon plates, and the electrode plates on the lower power receiving frame are longitudinal rectangular electrode plates; or, the carbon plates of the upper pantograph support are longitudinal rectangular carbon plates, and the electrode plates on the lower power receiving frame are transverse rectangular electrode plates.

[0019] By employing the aforementioned technical solution, the DC charging device for electric vehicles provided in this application uses a pantograph as the charging interface, replacing the traditional plug-in charging port. This design completely eliminates the physical size limitations of plug-in charging ports. The pantograph, with its large contact area for conducting electrical energy, effectively reduces current transmission obstacles, optimizes the current transmission path, and can withstand higher current densities, thus meeting the urgent needs of high-power electric vehicles for large capacity, high current, and megawatt-level fast charging. Simultaneously, compared to the heat dissipation effect of plug-in charging ports in enclosed spaces, the pantograph, with its large contact area for conducting heat and air circulation, offers superior heat dissipation performance, ensuring stable temperature during long-term, high-power charging, further improving charging efficiency and safety. Attached Figure Description

[0020] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0021] Figure 1 A front view of an upper pantograph bracket provided for this application;

[0022] Figure 2 A left view of an upper pantograph bracket provided for this application;

[0023] Figure 3 A top view of an upper pantograph support provided in this application;

[0024] Figure 4 A front view of a lower power receiving frame provided in this application;

[0025] Figure 5 A left view of a lower power receiving frame provided in this application;

[0026] Figure 6 A top view of a lower power receiving frame provided in this application;

[0027] Figure 7 This is a schematic diagram illustrating the docking process between the upper pantograph bracket and the lower power receiving frame, as provided in this application.

[0028] Figure label:

[0029] 40 - Grounding protection PE carbon plate; 42 - Grounding protection PE copper plate; 48 - Grounding protection PE wire in the upper pantograph bracket; 20 - DC power supply positive terminal DC+ carbon plate; 22 - DC power supply positive terminal DC+ copper plate; 46 - DC power supply positive terminal DC+ wire in the upper pantograph bracket; 60 - DC power supply DC- carbon plate; 62 - DC power supply DC- copper plate; 56 - DC power supply DC- wire in the upper pantograph bracket; 10 - Charging connection confirmation CC2 carbon plate; 12 - Charging connection confirmation C C2 copper plate; 66 - Charging connection confirmation CC2 wire in the upper pantograph bracket; 70 - Charging connection confirmation CC1 carbon plate; 72 - Charging connection confirmation CC1 copper plate; 78 - Charging connection confirmation CC1 wire in the upper pantograph bracket; 30 - Charging communication S+ carbon plate; 32 - Charging communication S+ copper plate; 68 - Charging communication S+ wire in the upper pantograph bracket; 50 - Charging communication S- carbon plate; 52 - Charging communication S- copper plate; 76 - Charging communication S- wire in the upper pantograph bracket;

[0030] 16 - First insulator; 44 - Grounding protection PE insulation board in the upper pantograph bracket; 24 - DC power supply positive terminal DC+ insulation board in the upper pantograph bracket; 64 - DC power supply DC- insulation board in the upper pantograph bracket; 14 - Charging connection confirmation CC2 insulation board in the upper pantograph bracket; 74 - Charging connection confirmation CC1 insulation board in the upper pantograph bracket; 34 - Charging communication S+ insulation board in the upper pantograph bracket; 54 - Charging communication S- insulation board in the upper pantograph bracket;

[0031] 18 - First crossbeam; 88 - Second crossbeam; 26 - First longitudinal beam; 28 - Second longitudinal beam;

[0032] 142 - Grounding protection PE plate; 148 - Grounding protection PE wire in the lower power receiving frame; 122 - DC power supply DC+ plate; 146 - DC power supply positive DC+ wire in the lower power receiving frame; 162 - DC power supply DC- plate; 156 - DC power supply DC- wire in the lower power receiving frame; 112 - Charging connection confirmation CC2 plate; 166 - Charging connection confirmation CC2 wire in the lower power receiving frame; 172 - Charging connection confirmation CC1 plate; 178 - Charging connection confirmation CC1 wire in the lower power receiving frame; 132 - Charging communication S+ plate; 168 - Charging communication S+ wire in the lower power receiving frame; 152 - Charging communication S- plate; 176 - Charging communication S- wire in the lower power receiving frame;

[0033] 116 - Second insulator; 144 - Grounding protection PE insulation board in the lower power receiving frame; 124 - DC power supply positive terminal DC+ insulation board in the lower power receiving frame; 164 - DC power supply DC- insulation board in the lower power receiving frame; 114 - Charging connection confirmation CC2 insulation board in the lower power receiving frame; 174 - Charging connection confirmation CC1 insulation board in the lower power receiving frame; 134 - Charging communication S+ insulation board in the lower power receiving frame; 154 - Charging communication S- insulation board in the lower power receiving frame;

[0034] 118 - Third crossbeam; 188 - Fourth crossbeam; 126 - Third longitudinal beam; 128 - Fourth longitudinal beam;

[0035] 36 - Control cabinet for DC charging pile; 136 - High-voltage control box for DC charging of whole vehicle;

[0036] 120 - Spring. Detailed Implementation

[0037] This application provides a DC charging device for electric vehicles. This device innovatively uses a pantograph as the charging interface, a design inspired by the efficient and reliable power supply methods in electrified railways. In electrified railways, electricity is transmitted through an overhead contact line or a third rail power supply system. The pantograph, as a power receiving device on the train's roof, can stably contact the contact line or third rail, transmitting electrical energy to the train's interior and providing continuous power. The pantograph in this application borrows this principle and applies it to the charging process of electric vehicles, replacing the traditional plug-in charging port. This design completely eliminates the physical size limitations of plug-in charging ports. The pantograph, with its large contact area, effectively reduces current transmission obstacles, optimizes the current transmission path, and can withstand higher current densities, thus meeting the urgent needs of high-power electric vehicles for large capacity, high current, and megawatt-level fast charging. Meanwhile, compared to the heat dissipation effect of plug-in charging ports in enclosed spaces, pantographs have superior heat dissipation performance due to their large-area contact conduction and air circulation, ensuring stable temperature during long-term, high-power charging and further improving charging efficiency and safety.

[0038] The following detailed description, with reference to the accompanying drawings, describes a DC charging device for electric vehicles provided in an embodiment of this application. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in this application are also applicable to similar technical problems.

[0039] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0040] See Figure 1 This application provides an embodiment of a DC charging device for an electric vehicle, comprising: an upper pantograph bracket and a lower charging frame; the upper pantograph bracket is used for electrical connection with a DC charging pile and can move up and down under the drive of a cylinder or an electric cylinder, thereby contacting the lower charging frame to establish an electrical connection, or disconnecting the contact to release the electrical connection; the lower charging frame is used for fixed installation on the electric vehicle and is electrically connected to the vehicle charging device of the electric vehicle.

[0041] Once the charging device is in use, the upper pantograph bracket maintains an electrical connection with the DC charging pile, while the lower charging frame is fixedly mounted on the electric vehicle and maintains a stable electrical connection with the vehicle's charging system. When the electric vehicle needs charging, the driver parks the vehicle in the designated charging location; then, the system starts, and the upper pantograph bracket, driven by a cylinder or electric cylinder, begins to move downwards until it makes contact with the lower charging frame. Once the upper pantograph bracket and lower charging frame are successfully connected, and the communication protocol between the vehicle and the DC charging pile is normal, the power transmission path is established. At this point, power from the DC charging pile can be transferred to the electric vehicle's battery through the upper pantograph bracket, lower charging frame, and the vehicle's charging system, thus achieving rapid charging of the vehicle.

[0042] The components that make up the pantograph support include: conductive components, insulating components, and load-bearing components. The structure of each component is described in detail below:

[0043] 1. Conductive components of the upper pantograph bracket

[0044] The conductive components of the upper pantograph support include: 7 carbon plates, 7 copper plates, and 7 wires.

[0045] That is, see Figures 1 to 3, the conductive components of the upper pantograph support include: grounding protection PE carbon plate 40, grounding protection PE copper plate 42, grounding protection PE wire 48 in the upper pantograph support, DC power positive pole DC+ carbon plate 20, DC power positive pole DC+ copper plate 22, DC power positive pole DC+ wire 46 in the upper pantograph support, DC power DC- carbon plate 60, DC power DC- copper plate 62, DC power DC- wire 56 in the upper pantograph support, charging connection confirmation CC2 carbon plate 10, charging connection confirmation CC2 copper plate 12, charging connection confirmation CC2 wire 66 in the upper pantograph support, charging connection confirmation CC1 carbon plate 70, charging connection confirmation CC1 copper plate 72, charging connection confirmation CC1 wire 78 in the upper pantograph support, charging communication S+ carbon plate 30, charging communication S+ copper plate 32, charging communication S+ wire 68 in the upper pantograph support, charging communication S- carbon plate 50, charging communication S- copper plate 52 and charging communication S- wire 76 in the upper pantograph support.

[0046] II. Insulating Components of the Upper Pantograph Support

[0047] The insulating components of the upper pantograph support include: the first insulator and 7 insulating plates.

[0048] That is, referring to Figures 1 to 3 , the insulating components of the upper pantograph support include: the first insulator 16, grounding protection PE insulating plate 44 in the upper pantograph support, DC power positive pole DC+ insulating plate 24 in the upper pantograph support, DC power DC- insulating plate 64 in the upper pantograph support, charging connection confirmation CC2 insulating plate 14 in the upper pantograph support, charging connection confirmation CC1 insulating plate 74 in the upper pantograph support, charging communication S+ insulating plate 34 in the upper pantograph support and charging communication S- insulating plate 54 in the upper pantograph support.

[0049] III. Bearing Components of the Upper Pantograph Support

[0050] Referring to Figures 1 to 3 , the bearing components of the upper pantograph support include: the first crossbeam 18, the second crossbeam 88, the first longitudinal beam 26 and the second longitudinal beam 28, and these four crossbeams form a "mouth" - shaped frame.

[0051] In addition, the components forming the lower power - receiving frame also include: conductive components, insulating components and bearing components. The structures of each component are described in detail below:

[0052] I. Conductive Components of the Lower Power - Receiving Frame

[0053] The conductive components of the lower power - receiving frame include: 7 electrode plates and 7 wires.

[0054] That is, referring to Figures 4 to 6The conductive components of the lower power receiving frame include: a grounding protection PE plate 142, a grounding protection PE wire 148 in the lower power receiving frame, a DC power supply DC+ plate 122, a DC power supply positive terminal DC+ wire 146 in the lower power receiving frame, a DC power supply DC- plate 162, a DC power supply DC- wire 156 in the lower power receiving frame, a charging connection confirmation CC2 plate 112, a charging connection confirmation CC2 wire 166 in the lower power receiving frame, a charging connection confirmation CC1 plate 172, a charging connection confirmation CC1 wire 178 in the lower power receiving frame, a charging communication S+ plate 132, a charging communication S+ wire 168 in the lower power receiving frame, a charging communication S- plate 152, and a charging communication S- wire 176 in the lower power receiving frame.

[0055] II. Insulating components of the lower power receiving frame

[0056] The insulating components of the lower power receiving frame include: a second insulator and seven insulating plates.

[0057] That is, see Figures 4 to 6 The insulating components of the lower power receiving frame include: a second insulator 116, a grounding protection PE insulating plate 144 in the lower power receiving frame, a DC power positive terminal DC+ insulating plate 124 in the lower power receiving frame, a DC power DC- insulating plate 164 in the lower power receiving frame, a charging connection confirmation CC2 insulating plate 114 in the lower power receiving frame, a charging connection confirmation CC1 insulating plate 174 in the lower power receiving frame, a charging communication S+ insulating plate 134 in the lower power receiving frame, and a charging communication S- insulating plate 154 in the lower power receiving frame.

[0058] III. Load-bearing components of the lower power receiving frame

[0059] The load-bearing components of the lower power receiving frame include: the third crossbeam 118, the fourth crossbeam 188, the third longitudinal beam 126, and the fourth longitudinal beam 128. These four crossbeams form a "U"-shaped frame that is fixed to the roof of the vehicle.

[0060] Based on the above structure, the connection relationships of the components of the upper pantograph bracket and the lower pantograph frame will be described below:

[0061] I. Connection Relationship of Components of the Upper Pantograph Support

[0062] The connection relationship of the components of the upper pantograph bracket includes: the i-th carbon plate, i-th copper plate, i-th wire, and i-th insulating plate of the upper pantograph bracket are combined with fasteners to form the i-th electrode of the upper pantograph bracket. The i-th copper plate of the upper pantograph bracket is stacked on top of the i-th carbon plate, and the i-th insulating plate of the upper pantograph bracket is stacked on top of the i-th copper plate. The i-th wire of the upper pantograph bracket passes through the i-th insulating plate, with one end extending out from above the i-th insulating plate and the other end connected to the i-th copper plate; i = 1, 2, 3, ..., 7. After the upper pantograph bracket moves down, the carbon plates of each electrode of the upper pantograph bracket are aligned with the corresponding electrode plates in the lower charging frame. Each wire of the upper pantograph bracket is also connected to the control cabinet 36 of the DC charging pile. The load-bearing components of the upper pantograph bracket fix each electrode of the upper pantograph bracket through the first insulator. The seven electrodes on the upper pantograph bracket are: PE electrode for grounding protection, DC+ electrode for DC power supply, DC- electrode for DC power supply, CC1 electrode for charging connection confirmation, CC2 electrode for charging connection confirmation, S+ electrode for charging communication, and S- electrode for charging communication.

[0063] For details, see Figures 1 to 3 The grounding protection PE carbon plate 40, grounding protection PE copper plate 42, grounding protection PE wire 48 in the upper pantograph bracket, and grounding protection PE insulation plate 44 in the upper pantograph bracket are sequentially assembled into a grounding protection PE electrode by fasteners. Specifically, the grounding protection PE carbon plate 40 is located at the bottom, the grounding protection PE copper plate 42 is stacked on top of the grounding protection PE carbon plate 40, and the grounding protection PE insulation plate 44 in the upper pantograph bracket is stacked on top of the grounding protection PE copper plate 42. The grounding protection PE wire 48 in the upper pantograph bracket passes through the grounding protection PE insulation plate 44 in the upper pantograph bracket, with one end protruding from above the grounding protection PE insulation plate 44 and the other end connected to the grounding protection PE copper plate 42. After the upper pantograph moves down, the grounding protection PE carbon plate 40 can connect to the grounding protection PE electrode plate 142 on the lower power receiving frame, achieving a reliable connection between the DC charging pile and the vehicle's grounding protection. The grounding protection PE wire 48 in the upper pantograph bracket is reliably connected to the control cabinet 36 of the DC charging pile. The control cabinet 36 of the DC charging pile is an important component of the DC charging pile.

[0064] The DC power supply positive terminal carbon plate 20, DC power supply positive terminal copper plate 22, DC power supply positive terminal wire 46 in the upper pantograph bracket, and DC power supply positive terminal insulating plate 24 in the upper pantograph bracket are sequentially assembled into a DC power supply positive terminal by fasteners. Among them, the DC power supply positive terminal carbon plate 20 is located at the bottom layer, the DC power supply positive terminal copper plate 22 is stacked on top of the DC power supply positive terminal carbon plate 20, and the DC power supply positive terminal insulating plate 24 in the upper pantograph bracket is stacked on top of the DC power supply positive terminal copper plate 22. The DC power supply positive terminal wire 46 in the upper pantograph bracket passes through the DC power supply positive terminal insulating plate 24 in the upper pantograph bracket, with one end protruding from the top of the DC power supply positive terminal insulating plate 24 in the upper pantograph bracket, and the other end connected to the DC power supply positive terminal copper plate 22. After the upper pantograph moves down, the DC+ positive plate 20 can be connected to the DC+ plate 122 on the lower power receiving frame, realizing a reliable connection between the DC charging pile and the DC power positive terminal of the vehicle; the DC+ positive wire 46 in the upper pantograph bracket is reliably connected to the control cabinet 36 of the DC charging pile.

[0065] A DC power supply carbon plate 60, a DC power supply copper plate 62, a DC power supply wire 56 in the upper pantograph bracket, and a DC power supply insulating plate 64 in the upper pantograph bracket are sequentially assembled into a DC power supply pole by fasteners. Among them, the DC power supply carbon plate 60 is located at the bottom layer, the DC power supply copper plate 62 is stacked on top of the DC power supply carbon plate 60, and the DC power supply insulating plate 64 in the upper pantograph bracket is stacked on top of the DC power supply copper plate 62. The DC power supply wire 56 in the upper pantograph bracket passes through the DC power supply insulating plate 64 in the upper pantograph bracket, with one end protruding from above the DC power supply insulating plate 64 in the upper pantograph bracket, and the other end connected to the DC power supply copper plate 62. After the upper pantograph moves down, the DC power supply DC-carbon plate 60 can be connected to the DC power supply DC-plate 162 on the lower power receiving frame, realizing a reliable connection between the DC charging pile and the positive terminal of the vehicle's DC power supply; the DC power supply DC-wire 56 in the upper pantograph bracket is reliably connected to the control cabinet 36 of the DC charging pile.

[0066] A charging connection confirmation CC2 carbon plate 10, a charging connection confirmation CC2 copper plate 12, a charging connection confirmation CC2 wire 66 in the upper pantograph bracket, and a charging connection confirmation CC2 insulating plate 14 in the upper pantograph bracket are sequentially assembled into a charging connection confirmation CC2 pole by fasteners. Specifically, the charging connection confirmation CC2 carbon plate 10 is located at the bottom layer, the charging connection confirmation CC2 copper plate 12 is stacked on top of the charging connection confirmation CC2 carbon plate 10, and the charging connection confirmation CC2 insulating plate 14 in the upper pantograph bracket is stacked on top of the charging connection confirmation CC2 copper plate 12. The charging connection confirmation CC2 wire 66 in the upper pantograph bracket passes through the charging connection confirmation CC2 insulating plate 14 in the upper pantograph bracket, with one end protruding from above the charging connection confirmation CC2 insulating plate 14 and the other end connected to the charging connection confirmation CC2 copper plate 12. After the upper pantograph moves down, the charging connection confirmation CC2 carbon plate 10 can be connected to the charging connection confirmation CC2 plate 112 on the lower power receiving frame, realizing a reliable connection between the DC charging pile and the positive terminal of the vehicle's DC power supply; the charging connection confirmation CC2 wire 66 in the upper pantograph bracket is reliably connected to the control cabinet 36 of the DC charging pile.

[0067] A charging connection confirmation CC1 carbon plate 70, a charging connection confirmation CC1 copper plate 72, a charging connection confirmation CC1 wire 78 in the upper pantograph bracket, and a charging connection confirmation CC1 insulating plate 74 in the upper pantograph bracket are sequentially assembled into a charging connection confirmation CC1 pole by fasteners. Specifically: the charging connection confirmation CC1 carbon plate 70 is located at the bottom layer; the charging connection confirmation CC1 copper plate 72 is stacked on top of the charging connection confirmation CC1 carbon plate 70; and the charging connection confirmation CC1 insulating plate 74 in the upper pantograph bracket is stacked on top of the charging connection confirmation CC1 copper plate 72. The charging connection confirmation CC1 wire 78 in the upper pantograph bracket passes through the charging connection confirmation CC1 insulating plate 74 in the upper pantograph bracket, with one end protruding from above the charging connection confirmation CC1 insulating plate 74 and the other end connected to the charging connection confirmation CC1 copper plate 72. After the upper pantograph moves down, the charging connection confirmation CC1 carbon plate 70 can be connected to the charging connection confirmation CC1 plate 172 on the lower power receiving frame, realizing a reliable connection between the DC charging pile and the positive terminal of the vehicle's DC power supply; the charging connection confirmation CC1 wire 78 in the upper pantograph bracket is reliably connected to the control cabinet 36 of the DC charging pile.

[0068] The charging communication S+ carbon plate 30, the charging communication S+ copper plate 32, the charging communication S+ wire 68 in the upper pantograph bracket, and the charging communication S+ insulating plate 34 in the upper pantograph bracket are sequentially assembled into a charging communication S+ pole by fasteners. Among them, the charging communication S+ carbon plate 30 is located at the bottom layer, the charging communication S+ copper plate 32 is stacked on top of the charging communication S+ carbon plate 30, and the charging communication S+ insulating plate 34 in the upper pantograph bracket is stacked on top of the charging communication S+ copper plate 32. The charging communication S+ wire 68 in the upper pantograph bracket passes through the charging communication S+ insulating plate 34 in the upper pantograph bracket, with one end protruding from the top of the charging communication S+ insulating plate 34 in the upper pantograph bracket, and the other end connected to the charging communication S+ copper plate 32. After the upper pantograph moves down, the charging communication S+ carbon plate 30 can be connected to the charging communication S+ plate 132 on the lower power receiving frame, realizing a reliable connection between the DC charging pile and the positive terminal of the vehicle's DC power supply; the charging communication S+ wire 68 in the upper pantograph bracket is reliably connected to the control cabinet 36 of the DC charging pile.

[0069] The charging communication S-carbon plate 50, the charging communication S-copper plate 52, the charging communication S-wire 76 in the upper pantograph bracket, and the charging communication S-insulating plate 54 in the upper pantograph bracket are sequentially assembled into a charging communication S-pole by fasteners. Among them, the charging communication S-carbon plate 50 is located at the bottom layer, the charging communication S-copper plate 52 is stacked on top of the charging communication S-carbon plate 50, and the charging communication S-insulating plate 54 in the upper pantograph bracket is stacked on top of the charging communication S-copper plate 52. The charging communication S-wire 76 in the upper pantograph bracket passes through the charging communication S-insulating plate 54 in the upper pantograph bracket, with one end protruding from the top of the charging communication S-insulating plate 54 in the upper pantograph bracket, and the other end connected to the charging communication S-copper plate 52. After the upper pantograph moves down, the charging communication S-carbon plate 50 can be connected to the charging communication S-plate 152 on the lower power receiving frame, realizing a reliable connection between the DC charging pile and the positive terminal of the vehicle's DC power supply; the charging communication S-wire 76 in the upper pantograph bracket is reliably connected to the control cabinet 36 of the DC charging pile.

[0070] The first crossbeam 18 is fixed by the first insulator 16 to the grounding protection PE carbon plate 40, the grounding protection PE copper plate 42, and the grounding protection PE insulating plate 44 in the upper pantograph bracket, which are stacked from bottom to top. It is also fixed by the DC power positive electrode carbon plate 20, the DC power positive electrode copper plate 22, and the DC power positive electrode DC+ insulating plate 24 in the upper pantograph bracket, which are stacked from bottom to top. Furthermore, it is fixed by the DC power DC- carbon plate 60, the DC power DC- copper plate 62, and the DC power DC- insulating plate 64 in the upper pantograph bracket, which are stacked from bottom to top.

[0071] The second crossbeam 88 fixes, through the first insulator 16, the charging connection confirmation CC2 carbon plate 10, the charging connection confirmation CC2 copper plate 12, and the charging connection confirmation CC2 insulating plate 14 in the upper pantograph support, which are stacked from bottom to top in sequence, and fixes the charging connection confirmation CC1 carbon plate 70, the charging connection confirmation CC1 copper plate 72, and the charging connection confirmation CC1 insulating plate 74 in the upper pantograph support, which are stacked from bottom to top in sequence, and fixes the charging communication S+ carbon plate 30, the charging communication S+ copper plate 32, and the charging communication S+ insulating plate 34 in the upper pantograph support, which are stacked from bottom to top in sequence, and fixes the charging communication S- carbon plate 50, the charging communication S- copper plate 52, and the charging communication S- insulating plate 54 in the upper pantograph support, which are stacked from bottom to top in sequence.

[0072] The first crossbeam 18 and the second crossbeam 88 form a "square" - shaped frame through the first longitudinal beam 26 and the second longitudinal beam 28. This frame can move up and down under the drive of a cylinder or an electric cylinder installed on the pantograph. When moving, the carbon plates of each electrode of the upper pantograph support are in contact - type docking with the electrode plates of the corresponding electrodes in the lower pantograph frame after the upper pantograph support moves down.

[0073] Some of the seven wires, namely the grounding protection PE wire 48 in the upper pantograph support, the DC power supply positive - pole DC+ wire 46 in the upper pantograph support, the DC power supply DC - wire 56 in the upper pantograph support, the charging connection confirmation CC2 wire 66 in the upper pantograph support, the charging connection confirmation CC1 wire 78 in the upper pantograph support, the charging communication S+ wire 68 in the upper pantograph support, and the charging communication S - wire 76 in the upper pantograph support, are fixed to the first crossbeam 18 through the first insulator 16 and connected to the control cabinet 36 of the DC charging pile, and the remaining wires are fixed to the second crossbeam 88 through the first insulator 16 and connected to the control cabinet 36 of the DC charging pile. Finally, the DC charging power supply (DC+, DC -, PE) and the control signals CC1, CC2, S+, S - of the control cabinet 36 of the DC charging pile are connected to the upper pantograph support.

[0074] In summary, in the upper pantograph support, carbon plates, copper plates, and conductors work together: the carbon plates are the main conductive or signal transmission components, capable of withstanding a certain current or transmitting signals; the copper plates, connected to the carbon plates, enhance conductivity, stabilize signal transmission, and reduce resistance loss due to their excellent conductivity; the conductors connect the copper plates to the control cabinet 36 of the DC charging pile, forming a complete circuit or signal path to ensure current flow and signal transmission. Insulating plates and insulators are crucial in the charging device. Insulating plates separate conductive components, preventing short circuits between electrodes, ensuring current conduction along a predetermined path, and fixing conductive components to maintain device stability. Insulators serve a dual function of support and insulation, insulating the conductors from surrounding components to prevent leakage, ensuring stable operation of the conductors during the movement of the upper pantograph support, and connecting the crossbeams and longitudinal beams of the "U"-shaped frame to enhance structural stability. The synergistic effect of insulating plates and insulators ensures the safe and efficient operation of the charging device.

[0075] II. Connection Relationship of Components of the Lower Power Receiving Frame

[0076] The connection relationships of the components of the lower power receiving frame include: the i-th electrode plate, the i-th wire, and the i-th insulating plate of the lower power receiving frame are all combined into the i-th electrode by fasteners. The i-th electrode plate of the lower power receiving frame is stacked on top of the i-th insulating plate. The i-th wire of the lower power receiving frame passes through the i-th insulating plate, with one end extending from below the i-th insulating plate and the other end connected to the i-th electrode plate. The wires of each electrode of the lower power receiving frame are also connected to the vehicle DC charging high-voltage control box of the vehicle charging device. The supporting components of the lower power receiving frame fix each electrode of the lower power receiving frame through a second insulator. Corresponding to the seven electrodes of the upper pantograph bracket, the seven electrodes of the lower power receiving frame are: grounding protection PE electrode, DC power supply DC+ electrode, DC power supply DC- electrode, charging connection confirmation CC1 electrode, charging connection confirmation CC2 electrode, charging communication S+ electrode, and charging communication S- electrode.

[0077] For details, see Figures 4 to 6The grounding protection PE electrode 142, the grounding protection PE conductor 148 in the lower power receiving frame, and the grounding protection PE insulation plate 144 in the lower power receiving frame are sequentially assembled into a grounding protection PE electrode on the lower power receiving frame by fasteners. The grounding protection PE electrode 142 is stacked on top of the grounding protection PE insulation plate 144 in the lower power receiving frame. The grounding protection PE conductor 148 in the lower power receiving frame passes through the grounding protection PE insulation plate 144 in the lower power receiving frame, with one end extending from below the grounding protection PE insulation plate 144 and the other end connected to the grounding protection PE electrode 142. The grounding protection PE conductor 148 in the lower power receiving frame is reliably connected to the vehicle DC charging high-voltage control box 136 on the lower power receiving frame. The vehicle DC charging high-voltage control box 136 is an important component of the vehicle charging device.

[0078] A DC+ power supply plate 122, a DC+ positive power supply wire 146 in the lower power receiving frame, and a DC+ positive power supply insulating plate 124 in the lower power receiving frame are sequentially assembled into a DC+ power supply electrode on the lower power receiving frame using fasteners. Specifically, the DC+ power supply plate 122 is stacked on top of the DC+ positive power supply insulating plate 124 in the lower power receiving frame; the DC+ positive power supply wire 146 passes through the DC+ positive power supply insulating plate 124, with one end extending from below the insulating plate and the other end connected to the DC+ power supply plate 122. The DC+ positive power supply wire 146 in the lower power receiving frame is reliably connected to the vehicle DC charging high-voltage control box 136 on the lower power receiving frame.

[0079] The DC power supply DC-plate 162, the DC power supply DC-wire 156 in the lower power receiving frame, and the DC power supply DC-insulating plate 164 in the lower power receiving frame are sequentially assembled by fasteners to form a DC power supply DC-plate on the lower power receiving frame. Specifically, the DC power supply DC-plate 162 is stacked on top of the DC power supply DC-insulating plate 164 in the lower power receiving frame; the DC power supply DC-wire 156 passes through the DC power supply DC-insulating plate 164 in the lower power receiving frame, with one end extending from below the DC power supply DC-insulating plate 164 and the other end connected to the DC power supply DC-plate 162. The DC power supply DC-wire 156 in the lower power receiving frame is reliably connected to the vehicle DC charging high-voltage control box 136 on the lower power receiving frame.

[0080] The charging connection confirmation CC2 electrode 112, the charging connection confirmation CC2 wire 166 in the lower power receiving frame, and the charging connection confirmation CC2 insulating plate 114 in the lower power receiving frame are sequentially assembled into a charging connection confirmation CC2 electrode on the lower power receiving frame by fasteners. Specifically, the charging connection confirmation CC2 electrode 112 is stacked on top of the charging connection confirmation CC2 insulating plate 114 in the lower power receiving frame; the charging connection confirmation CC2 wire 166 in the lower power receiving frame passes through the charging connection confirmation CC2 insulating plate 114, with one end protruding from below the insulating plate 114 and the other end connected to the charging connection confirmation CC2 electrode 112. The charging connection confirmation CC2 wire 166 in the lower power receiving frame is reliably connected to the vehicle DC charging high-voltage control box 136 on the lower power receiving frame.

[0081] The charging connection confirmation CC1 electrode 172, the charging connection confirmation CC1 wire 178 in the lower power receiving frame, and the charging connection confirmation CC1 insulating plate 174 in the lower power receiving frame are sequentially assembled into a charging connection confirmation CC1 electrode on the lower power receiving frame by fasteners. Specifically, the charging connection confirmation CC1 electrode 172 is stacked on top of the charging connection confirmation CC1 insulating plate 174 in the lower power receiving frame; the charging connection confirmation CC1 wire 178 passes through the charging connection confirmation CC1 insulating plate 174 in the lower power receiving frame, with one end protruding from below the insulating plate 174 and the other end connected to the charging connection confirmation CC1 electrode 172. The charging connection confirmation CC1 wire 178 in the lower power receiving frame is reliably connected to the vehicle DC charging high-voltage control box 136 on the lower power receiving frame.

[0082] The charging communication S+ electrode 132, the charging communication S+ wire 168 in the lower power receiving frame, and the charging communication S+ insulating plate 134 in the lower power receiving frame are sequentially assembled by fasteners to form a charging communication S+ electrode on the lower power receiving frame. Specifically, the charging communication S+ electrode 132 is stacked on top of the charging communication S+ insulating plate 134 in the lower power receiving frame; the charging communication S+ wire 168 in the lower power receiving frame passes through the charging communication S+ insulating plate 134, with one end extending from below the insulating plate and the other end connected to the charging communication S+ electrode 132. The charging communication S+ wire 168 in the lower power receiving frame is reliably connected to the vehicle DC charging high-voltage control box 136 on the lower power receiving frame.

[0083] The charging communication S-plate 152, the charging communication S-wire 176 in the lower power receiving frame, and the charging communication S-insulating plate 154 in the lower power receiving frame are successively combined into a charging communication S-pole on the lower power receiving frame by fasteners. Among them: the charging communication S-plate 152 is stacked above the charging communication S-insulating plate 154 in the lower power receiving frame; the charging communication S-wire 176 in the lower power receiving frame penetrates through the charging communication S-insulating plate 154 in the lower power receiving frame, one end of which passes out from below the charging communication S-insulating plate 154 in the lower power receiving frame, and the other end is connected to the charging communication S-plate 152. The charging communication S-wire 176 in the lower power receiving frame is reliably connected to the vehicle-mounted DC charging high-voltage control box 136 on the lower power receiving frame.

[0084] The third crossbeam 118 fixes the phase-laminated grounding protection PE plate 142 and the grounding protection PE insulating plate 144 in the lower power receiving frame through the second insulator 116, fixes the phase-laminated DC power supply DC+ plate 122 and the DC power supply positive pole DC+ insulating plate 124 in the lower power receiving frame, and fixes the phase-laminated DC power supply DC- plate 162 and the DC power supply DC- insulating plate 164 in the lower power receiving frame.

[0085] The fourth crossbeam 188 fixes the phase-laminated charging connection confirmation CC2 plate 112 and the charging connection confirmation CC2 insulating plate 114 in the lower power receiving frame through the second insulator 116, fixes the phase-laminated charging connection confirmation CC1 plate 172 and the charging connection confirmation CC1 insulating plate 174 in the lower power receiving frame, fixes the phase-laminated charging communication S+ plate 132 and the charging communication S+ insulating plate 134 in the lower power receiving frame, and fixes the phase-laminated charging communication S- plate 152 and the charging communication S- insulating plate 154 in the lower power receiving frame.

[0086] The third crossbeam 118 and the fourth crossbeam 188 form a "square" frame through the third longitudinal beam 126 and the fourth longitudinal beam 128 and are fixed on the roof of the vehicle.

[0087] The following seven wires are connected to the vehicle DC charging high-voltage control box 136 on the lower power receiving frame: the grounding protection PE wire 148, the DC power positive DC+ wire 146, the DC power DC- wire 156, the charging connection confirmation CC2 wire 166, the charging connection confirmation CC1 wire 178, the charging communication S+ wire 168, and the charging communication S- wire 176. Some of these wires are fixed to the third crossbeam 118 via the second insulator 116 and connected to the vehicle DC charging high-voltage control box 136 on the lower power receiving frame. The remaining wires are fixed to the fourth crossbeam 188 via the second insulator 116 and connected to the vehicle DC charging high-voltage control box 136 on the lower power receiving frame. This ultimately connects the DC charging power (DC+, DC-, PE) and control signals CC1, CC2, S+, S- of the vehicle DC charging high-voltage control box 136 to the vehicle.

[0088] In summary, the conductive plates of different electrodes are electrically isolated from each other by insulating plates and the first insulator 16 and the second insulator 116. At the same time, the conductors of the upper pantograph bracket are electrically isolated from the control cabinet 36 of the DC charging pile on the upper pantograph bracket by the first insulator 16 and the physical path of the conductors is fixed. The conductors of the lower power receiving frame are electrically isolated from the vehicle DC charging high voltage control box 136 on the lower power receiving frame by the second insulator 116 and the physical path of the conductors is fixed. This ensures that the upper pantograph bracket and the conductors of the lower power receiving frame can work stably and reliably in motion.

[0089] Furthermore, although the electric vehicle DC charging device of this application embodiment adopts a novel design of charging pantograph, it still complies with relevant national standards. It has seven electrodes: grounding protection PE electrode, DC power supply DC+ electrode, DC power supply DC- electrode, charging connection confirmation CC1 electrode, charging connection confirmation CC2 electrode, charging communication S+ electrode, and charging communication S- electrode. Therefore, it meets the national standard GB / T20234.4-2023 requirements for the number of high-power DC charging interfaces, ensuring compatibility with existing DC charging piles and electric vehicles.

[0090] Among them, the DC power supply DC-terminal refers to the negative terminal of the DC charging output from the control cabinet 36 of the DC charging pile and connected to the DC charging high-voltage control box 136 of the vehicle. During normal operation, it has a large DC current, and its wire diameter is relatively thick, consisting of one or more wires, with a cross-sectional area of ​​approximately 70–500 mm². 2 , or even thicker.

[0091] DC power supply DC+ terminal: This refers to the positive DC charging terminal output from the control cabinet 36 of the DC charging pile and connected to the high-voltage control box 136 of the vehicle's DC charging system. During normal operation, it generates a large DC current. Its conductors are relatively thick, consisting of one or more wires, with a cross-sectional area of ​​approximately 70–500 mm². 2 , or even thicker.

[0092] The conductor led out from the PE electrode of the grounding protection refers to the conductor that connects the control cabinet 36 of the DC charging pile to the DC charging high voltage control box 136 of the vehicle and serves as the grounding protection conductor. Its conductor diameter is relatively thick, about half the diameter of the positive and negative conductors of the DC power supply.

[0093] The charging connection confirmation signals CC1 and CC2 are confirmation signals for the physical connection between the upper pantograph bracket and the lower charging frame. Their ends are connected to the control cabinet 36 of the DC charging pile and the high-voltage control box 136 of the vehicle's DC charging system, respectively. These are control signals with a relatively thin wire diameter, approximately 1.5–2.5 mm. 2 Charging connection confirmation CC1 indicates a confirmed connection at the charging station, while charging connection confirmation CC2 indicates a confirmed charging connection at the vehicle level.

[0094] The signals of the charging communication S+ and S- terminals refer to the communication signals of the physical connection between the upper pantograph bracket and the lower charging frame. Both ends are connected to the control cabinet 36 of the DC charging pile and the high-voltage control box 136 of the vehicle's DC charging system, respectively. These are control signals with a relatively thin wire diameter, approximately 1.5–2.5 mm. 2 In charging communication, S+ represents the CAN_H signal line, while S- represents the CAN_L signal line.

[0095] The cross-sectional area of ​​the plates and conductors of the DC+, DC-, and PE electrodes on the upper pantograph bracket and lower power receiving frame can reach several hundred to several thousand mm². 2 It can handle currents of thousands of amperes; its electrical spacing and insulation performance can meet the requirements of thousands of volts, and it can fully meet the requirements of megawatt-level DC fast charging.

[0096] The process of connecting the upper pantograph bracket to the lower power receiving frame is as follows: Figure 7 As shown. In one possible implementation, the contact sequence between the carbon plates of the upper pantograph bracket and the electrodes of the lower power receiving frame is determined by the thickness of the carbon plates. Thicker carbon plates will contact the corresponding electrodes first, thus ensuring the priority execution of key steps such as grounding protection, connection confirmation, and charging communication, ultimately completing the charging preparation work of the entire pantograph and meeting the requirements of the national standard GB / T20234.4-2023 for the contact sequence of high-power DC charging interfaces.

[0097] The specific thicknesses of the carbon plates are as follows: the thickest is the PE carbon plate 40 for the grounding protection of the upper pantograph bracket; the second thickest is the CC2 carbon plate 10 for the charging connection confirmation of the upper pantograph bracket; the third thickest are the DC+ carbon plate 20 and DC- carbon plate 60 for the DC power supply positive terminal of the upper pantograph bracket; the fourth thickest are the S+ carbon plate 30 and S- carbon plate 50 for the charging communication of the upper pantograph bracket; and the thinnest is the CC1 carbon plate 70 for the charging connection confirmation of the upper pantograph bracket.

[0098] That is, the contact sequence between the carbon plates of the upper pantograph bracket and the electrodes of the lower power receiving frame is as follows: Under the downward drive of the cylinder or electric cylinder, the seven carbon plates of the upper pantograph bracket—the grounding protection PE electrode, DC power supply DC+ electrode, DC power supply DC- electrode, charging connection confirmation CC1 electrode, charging connection confirmation CC2 electrode, charging communication S+ electrode, and charging communication S- electrode—are the first to contact the grounding protection PE electrode 142 of the lower power receiving frame fixed to the top of the vehicle because the upper pantograph bracket's grounding protection PE carbon plate 40 is thicker than the other six carbon plates; the upper pantograph bracket's charging connection confirmation CC2 carbon plate 10 is thicker than the other five carbon plates, and it is the second to contact the lower power receiving frame's charging connection confirmation CC2 electrode 11 fixed to the top of the vehicle. 2. Contact: The DC+ carbon plate 20 and DC- carbon plate 60 of the upper pantograph bracket are thicker than the other three carbon plates. They are the third to contact the DC+ electrode 122 and DC- electrode 162 of the lower power receiving frame fixed on the top of the vehicle. The S+ carbon plate 30 and S- carbon plate 50 of the upper pantograph bracket are thicker than the CC1 carbon plate 70 of the charging connection confirmation. They are the fourth to contact the S+ electrode 132 and S- electrode 152 of the lower power receiving frame fixed on the top of the vehicle. The CC1 carbon plate 70 of the upper pantograph bracket is the thinnest. It is the last to contact the CC1 electrode 172 of the lower power receiving frame fixed on the top of the vehicle.

[0099] In one possible implementation, the lower receiving frame further includes a spring; the spring is used to absorb the displacement generated during the docking process between the carbon plates of the upper pantograph support and the corresponding plates of the lower receiving frame through its own elastic deformation.

[0100] For details, please refer to [link / reference]. Figure 4The seven carbon plates of the upper pantograph bracket—the grounding protection PE terminal, DC power supply DC+ terminal, DC power supply DC- terminal, charging connection confirmation CC1 terminal, charging connection confirmation CC2 terminal, charging communication S+ terminal, and charging communication S- terminal—are driven by a cylinder or electric cylinder to contact the seven corresponding plates on the lower power receiving frame fixed to the top of the vehicle in a predetermined sequence (divided into five contact actions). During this process, the displacement between the carbon plates of the upper pantograph bracket and the plates of the lower power receiving frame is absorbed by a spring 120 mounted on the lower power receiving frame on the top of the vehicle, thereby ensuring close contact between the seven carbon plates fixed to the upper pantograph bracket and the seven corresponding plates fixed to the lower power receiving frame on the top of the vehicle. This close contact helps reduce contact resistance, thereby reducing heat generation during high-current charging and ensuring efficient and safe charging.

[0101] The displacement between the carbon plate of the upper pantograph bracket and the electrode plate of the lower power receiving frame refers to the relative position change between the electrode plates of the upper pantograph bracket and the lower power receiving frame during each contact process caused by various factors. This change is dynamic throughout the contact process. The spring absorbs and buffers these displacements through its own elastic deformation to ensure close contact between the electrode plates.

[0102] In one possible implementation, each carbon plate on the upper pantograph bracket is a transverse rectangular carbon plate, while each electrode plate on the lower power receiving frame is a longitudinal rectangular electrode plate, which complements the transverse rectangular carbon plates of the upper pantograph bracket to improve the tolerance of electric vehicles to parking position errors when charging (i.e., to ensure effective electrical connection even if there is a certain parking position error when the electric vehicle is parked and charging).

[0103] Alternatively, the carbon plates on the upper pantograph support can be longitudinal rectangular carbon plates, and the electrode plates on the lower receiving frame can be transverse rectangular electrode plates.

[0104] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the embodiments of this application. Therefore, the embodiments of this application are not to be limited to the embodiments shown herein, but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A DC charging device for electric vehicles, characterized in that, include: Upper pantograph support and lower power receiving frame; The upper pantograph bracket is used for electrical connection with the DC charging pile and can move up and down under the drive of a cylinder or electric cylinder, so as to contact the lower pantograph frame to establish an electrical connection, or disconnect the contact to release the electrical connection. The lower power receiving frame is used for fixed installation on the electric vehicle and is electrically connected to the vehicle's charging device. The components that make up the upper pantograph support and the components that make up the lower pantograph frame both include: conductive components, insulating components, and load-bearing components; The conductive components of the upper pantograph bracket include: 7 carbon plates, 7 copper plates, and 7 wires; The insulating components of the upper pantograph support include: a first insulator and seven insulating plates; The conductive components of the lower power receiving frame include: 7 electrode plates and 7 wires; The insulating components of the lower power receiving frame include: a second insulator and seven insulating plates; The i-th carbon plate, i-th copper plate, i-th wire, and i-th insulating plate of the upper pantograph bracket are assembled into the i-th electrode of the upper pantograph bracket by fasteners. The i-th copper plate of the upper pantograph bracket is stacked on top of the i-th carbon plate of the upper pantograph bracket, and the i-th insulating plate of the upper pantograph bracket is stacked on top of the i-th copper plate of the upper pantograph bracket. After the i-th wire of the upper pantograph bracket passes through the i-th insulating plate, one end of it passes out from above the i-th insulating plate of the upper pantograph bracket, and the other end is connected to the i-th copper plate of the upper pantograph bracket; i=1,2,3,……,7; after the upper pantograph bracket moves down, the carbon plates of each electrode of the upper pantograph bracket are connected to the corresponding electrode plates in the lower pantograph frame.

2. The electric vehicle DC charging device according to claim 1, characterized in that, The conductors of the upper pantograph bracket are also connected to the control cabinet of the DC charging pile; the load-bearing components of the upper pantograph bracket fix the electrodes of the upper pantograph bracket through the first insulator. The i-th electrode plate, the i-th wire, and the i-th insulating plate of the lower power receiving frame are all assembled into the i-th electrode by fasteners. The i-th electrode plate of the lower power receiving frame is stacked on top of the i-th insulating plate of the lower power receiving frame. The i-th wire of the lower power receiving frame passes through the i-th insulating plate of the lower power receiving frame, with one end passing out from under the i-th insulating plate of the lower power receiving frame and the other end connected to the i-th electrode plate of the lower power receiving frame. The wires of each electrode of the lower power receiving frame are also connected to the vehicle DC charging high-voltage control box of the vehicle charging device. The supporting components of the lower power receiving frame fix each electrode of the lower power receiving frame by the second insulator. The seven electrodes of the upper pantograph bracket and the seven electrodes of the lower power receiving frame are respectively: grounding protection PE electrode, DC power supply DC+ electrode, DC power supply DC- electrode, charging connection confirmation CC1 electrode, charging connection confirmation CC2 electrode, charging communication S+ electrode, and charging communication S- electrode.

3. The electric vehicle DC charging device according to claim 2, characterized in that, The contact sequence between the carbon plates of the upper pantograph bracket and the electrodes of the lower receiving frame is determined by the thickness of the carbon plates; the thicker carbon plates contact the corresponding electrodes first. Specifically: The PE carbon plate for grounding protection of the upper pantograph bracket is the thickest; the CC2 carbon plate for charging connection of the upper pantograph bracket is the second thickest; the DC+ and DC- carbon plates for DC power supply positive terminals of the upper pantograph bracket are the third thickest; the S+ and S- carbon plates for charging communication of the upper pantograph bracket are the fourth thickest; and the CC1 carbon plate for charging connection of the upper pantograph bracket is the thinnest.

4. The electric vehicle DC charging device according to claim 2 or 3, characterized in that, The lower receiving frame also includes a spring; the spring is used to absorb the displacement generated during the docking process between the carbon plates of the upper pantograph bracket and the corresponding plates of the lower receiving frame through its own elastic deformation.

5. The electric vehicle DC charging device according to claim 2 or 3, characterized in that, The carbon plates on the upper pantograph bracket are horizontal rectangular carbon plates, while the plates on the lower power receiving frame are vertical rectangular plates. Alternatively, the carbon plates on the upper pantograph support can be longitudinal rectangular carbon plates, and the electrode plates on the lower receiving frame can be transverse rectangular electrode plates.

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