A charging gun and a charging device

Abstract

The utility model provides a kind of charging gun and charging equipment, the charging gun includes: charging gun head, charging gun tail, PE connecting line and transmission cable;The CP contact of charging gun head is connected with the core of transmission cable, transmission cable extends to charging gun tail, the shielding component of transmission cable is short-circuited at charging gun head position with PE connecting line, the core of transmission cable of charging gun tail is used to be connected with the CP contact of external charging pile, the shielding component of transmission cable of charging gun tail is used to be connected with the GND contact of external charging pile;One end of PE connecting line is connected with the PE contact of charging gun head, the other end of PE connecting line extends to charging gun tail;The PE connecting line of charging gun tail is used to be connected with the ground row of external charging pile. By adjusting the grounding position of stake end to build complete closed loop ground loop, ground loop can be shortened, shielding effectiveness is enhanced, and charging communication stability is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle charging technology, and in particular to a charging gun and charging equipment. Background Technology

[0002] As a core component connecting the charging station and the vehicle, the charging gun's internal CP (Control Pilot) and PE (Protective Earth) wires not only perform basic functions such as charging control and safety grounding, but also serve as the physical carrier for power line carrier communication. The CP and PE wires achieve data modulation through potential difference, transmitting commands such as charging power requests and connection status confirmations bidirectionally in the form of high-frequency carrier signals. Therefore, the stability of signal transmission directly affects charging safety and communication reliability. However, current charging gun designs do not adequately consider the impact of wiring harness characteristics on carrier signal transmission, resulting in significant carrier signal attenuation and poor charging stability. For example, in some current charging gun designs, the CP signal terminal and PE terminal directly use ordinary charging cable connected to the CP signal terminal and GND terminal inside the charging station via the gun tail. Problems such as excessive cable length and poor shielding can lead to signal attenuation. Utility Model Content

[0003] This invention provides a charging gun and a charging device, aiming to solve the problem of poor charging stability caused by severe carrier signal attenuation in related technologies.

[0004] To address the aforementioned technical problems, the first aspect of this utility model provides a charging gun, comprising: a charging gun head, a charging gun tail, a PE connecting wire, and a transmission cable; the CP contact of the charging gun head is connected to the core of the transmission cable, the transmission cable extends to the charging gun tail, the shielding component of the transmission cable is short-circuited to the PE connecting wire at the charging gun head, the core of the transmission cable at the charging gun tail is used to connect to the CP contact of an external charging pile, and the shielding component of the transmission cable at the charging gun tail is used to connect to the GND contact of an external charging pile; one end of the PE connecting wire is connected to the PE contact of the charging gun head, and the other end of the PE connecting wire extends to the charging gun tail; the PE connecting wire at the charging gun tail is used to connect to the grounding bar of an external charging pile.

[0005] In some implementations, the transmission cable includes a coaxial cable or a twisted pair cable.

[0006] In some embodiments, when the transmission cable is a coaxial cable, the shielding layer of the coaxial cable is short-circuited with the PE connection line at the charging gun head.

[0007] In some embodiments, when the transmission cable is a twisted pair, the shielding layer of the twisted pair is short-circuited with the PE connection line at the charging gun head.

[0008] In some implementations, the PE connecting wire is a yellow-green PE wire with a wire diameter that meets the specifications required for the rated current of the charging gun.

[0009] In some implementations, the charging gun is compatible with CCS1, CCS2, and NACS standards.

[0010] In some implementations, the distance between the transmission cable and the power cable in the charging gun is greater than a preset value.

[0011] The second aspect of this utility model provides a charging device, including a charging pile and a charging gun as described in the first aspect of this utility model. The core of the transmission cable at the tail of the charging gun is connected to the CP terminal of the SECC in the charging pile, and the shielding component of the transmission cable at the tail of the charging gun is connected to the GND terminal of the SECC in the charging pile.

[0012] In some embodiments, the CP terminal of the charging gun head is used to connect to the CP terminal of the external vehicle charging interface, the PE terminal of the charging gun head is used to connect to the PE terminal of the external vehicle charging interface, and the PE terminal of the external vehicle charging interface is connected to the GND terminal of the EVCC in the external vehicle.

[0013] The charging gun of this utility model adopts a design in which the gun head shielding layer is short-circuited with the PE line and the GND of the charging pile is connected to the shielding layer. By adjusting the grounding position of the charging pile, a complete closed-loop ground circuit is constructed, which can shorten the ground circuit and enhance the shielding effectiveness. This solves the inherent attenuation problem of the separate wiring, avoids charging failure or gun tripping caused by signal attenuation, and effectively improves the stability of charging communication. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a charging gun according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of a charging device according to an embodiment of the present utility model. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0016] In related technologies, there is a problem of poor charging stability due to severe carrier signal attenuation. Therefore, this utility model provides a charging gun.

[0017] like Figure 1 The diagram shows a structural schematic of a charging gun according to an embodiment of the present invention. The charging gun includes: a charging gun head, a charging gun tail, a PE connecting wire, and a transmission cable. The CP contact of the charging gun head is connected to the core of the transmission cable, which extends to the charging gun tail. The shielding component of the transmission cable is short-circuited to the PE connecting wire at the charging gun head. The core of the transmission cable at the charging gun tail is used to connect to the CP contact of an external charging pile, and the shielding component of the transmission cable at the charging gun tail is used to connect to the GND contact of an external charging pile. One end of the PE connecting wire is connected to the PE contact of the charging gun head, and the other end of the PE connecting wire extends to the charging gun tail. The PE connecting wire at the charging gun tail is used to connect to the grounding bar of an external charging pile.

[0018] In this embodiment, the transmission cable can be a low-loss shielded cable, such as a triple-shielded cable. The core wire can be multi-strand tinned copper wire to reduce DC resistance, and the insulation layer can be made of materials such as PTFE or XLPE (with low high-frequency loss). By short-circuiting the shielding component of the transmission cable to the PE connection line at the charging gun head, and then connecting the GND end of the charging pile to the shielding component of the transmission cable, compared to connecting the GND end of the charging pile to the PE line, the PE line connection method in this embodiment can form a complete ground loop: GND at the pile end → shielding component → PE line at the gun head → GND at the vehicle end → CP wire core → CP at the pile end. The length of the ground loop is only the length of the transmission cable, the loop area is close to zero, and the inductance loss is almost negligible. The shielding component is grounded at both ends, which can block external interference coupling and internal signal leakage, avoiding signal distortion caused by interference. Furthermore, the electromagnetic interference generated by the power cable inside the charging gun can also be intercepted by the shielding component and quickly conducted to the ground through the PE line, preventing interference signals from intruding into the core wire and causing carrier signal distortion. At the same time, the shielding layer forms an equipotential shield, reducing signal radiation and reducing radiation attenuation.

[0019] In some implementations, the transmission cable includes a coaxial cable or a twisted pair cable.

[0020] In this embodiment, the transmission cable can use coaxial cable or shielded twisted pair wires to transmit the CP signal. Compared with traditional ordinary wires, the wire core material and insulation layer design of this type of cable are more suitable for high-frequency carrier signal (2MHz to 28MHz) transmission. The wire core cross-section can be ≥0.5mm² to reduce conductor resistance loss, thereby reducing inherent attenuation at the transmission medium level.

[0021] In some implementations, when the transmission cable is a coaxial cable, the shielding layer of the coaxial cable is short-circuited with the PE connection line at the charging gun head.

[0022] In this embodiment, when using coaxial cable as the transmission cable for the CP signal line, its fixed characteristic impedance (e.g., 50Ω) enables impedance matching throughout the entire path from the pile end (signal source) to the vehicle end (load), which helps eliminate reflection loss. Furthermore, the transmission attenuation of high-frequency carrier signals in high-quality coaxial cables is extremely low. Combined with the short circuit between the PE line and the shielding component (eliminating reflection loss, radiation loss, and ground loop inductance loss), only a small amount of dielectric loss remains (a trace energy consumption of the coaxial cable's insulating medium), ultimately controlling the total attenuation to ≤2 dB.

[0023] In some implementations, when the transmission cable is a twisted pair, the shielding layer of the twisted pair is short-circuited to the PE connection line at the charging gun head. The shielding layer of the twisted pair can be the grounding braid of the twisted pair bundle.

[0024] In this embodiment, the transmission cable can also be a twisted pair. After shorting, the shielding layer can quickly conduct external interference signals (such as electromagnetic radiation from the charging pile power module and high-voltage wiring harness) to the ground through the PE line, avoiding interference with the CP signal (such as the charging power adjustment PWM signal) or communication signal in the twisted pair, reducing problems such as charging start failure and abnormal stop in the middle; and the twisted pair has a good effect on canceling low-frequency interference, while the grounded shielding layer can specifically solve medium and high frequency electromagnetic interference. The complementary effect can achieve full-band interference protection.

[0025] In some implementations, the PE connecting wire is a yellow-green PE wire with a wire diameter that meets the specifications required for the rated current of the charging gun.

[0026] In this embodiment, the PE connecting wire can be a yellow-green PE wire with a wire diameter that meets the rated current requirements, in order to avoid overheating and accelerated aging of the PE wire due to overload, thus extending the service life of the charging gun. For example, when the rated current of the charging gun is 16A, the core cross-section of the yellow-green PE wire should be ≥1.5mm²; when the rated current of the charging gun is 32A, the core cross-section of the yellow-green PE wire should be ≥2.5mm².

[0027] In some implementations, the charging gun is compatible with CCS1, CCS2, and NACS standards.

[0028] In this embodiment, the charging gun with the aforementioned signal transmission design is compatible with multiple carrier communication standards, such as CCS1 (North American Union Charging Standard), CCS2 (European Union Charging Standard), and NACS (North American Charging Standard), and can be adapted to mainstream electric vehicles, with high versatility.

[0029] In some implementations, the distance between the transmission cable and the power cable in the charging gun is greater than a preset value.

[0030] In this embodiment, the power cables (L line and N line) of the charging gun are high-power current transmission channels, which generate a strong electromagnetic field during operation, and the switching action of power devices such as IGBTs generates a large amount of high-frequency noise. Meanwhile, the transmission cables are typically low-voltage signal lines such as CP control lines, responsible for transmitting critical signals such as charging start / stop and power regulation, and have weak anti-interference capabilities. Therefore, setting the distance between them to be greater than a preset value (e.g., ≥5cm) can significantly reduce the electromagnetic coupling strength between them, avoiding signal distortion (such as PWM signal distortion on the CP line) or communication errors, and reducing problems such as charging start failure and mid-charge disconnection.

[0031] The charging gun provided in this embodiment of the utility model uses a coaxial cable for CP signal transmission. Combined with the design of short-circuiting the shielding layer of the gun head with the PE line and connecting the GND of the charging pile to the shielding layer, the coaxial cable achieves continuous impedance matching and reduces radiation and reflection losses. Furthermore, by adjusting the grounding position of the charging pile (connecting to the shielding layer instead of directly connecting to the PE line, so that the common ground of the charging pile signal reference ground GND and the vehicle end is connected from the tail of the gun to the head of the gun), a complete closed-loop ground circuit is constructed. This solves the inherent attenuation problem of separate wiring and ultimately controls the carrier signal attenuation brought by the charging gun to within 2 dB, greatly improving the stability of charging communication and avoiding charging failure or gun tripping problems caused by signal attenuation.

[0032] like Figure 2 The diagram shown is a structural schematic of a charging device according to an embodiment of this utility model. Please refer to [link / reference]. Figure 2 The charging equipment includes a charging pile and the aforementioned charging gun. The core of the transmission cable at the end of the charging gun is connected to the CP terminal of the SECC in the charging pile, and the shielding component of the transmission cable at the end of the charging gun is connected to the GND terminal of the SECC in the charging pile.

[0033] The SECC (Smart Electric Vehicle Communication Controller) is the core communication component on the charging pile side. It is responsible for negotiating charging parameters with the EVCC on the vehicle side, monitoring the charging process, and supporting data interaction using technologies such as PLC (Power Line Communication). The EVCC (Electric Vehicle Communication Controller) is the communication hub on the vehicle side. It connects to the Battery Management System (BMS), transmits information such as battery level, temperature, and required power to the SECC, and simultaneously receives control commands from the charging pile to control the start and stop of charging.

[0034] Furthermore, in some embodiments, the CP terminal of the charging gun head is used to connect to the CP terminal of the external vehicle charging interface, the PE terminal of the charging gun head is used to connect to the PE terminal of the external vehicle charging interface, and the PE terminal of the external vehicle charging interface is connected to the GND terminal of the EVCC in the external vehicle.

[0035] In this embodiment, the CP endpoint connection enables bidirectional data interaction between the SECC (charging station) and EVCC (vehicle). Connecting the transmission cable shield to the GND endpoint of the SECC provides shielding grounding for the CP signal, blocking strong electromagnetic interference from the power cables (high voltage, high current) inside the charging gun and preventing communication failure due to CP signal distortion. Connecting the PE endpoint forms a closed loop between the vehicle shell, the charging gun shell, and the charging station grounding busbar, while simultaneously linking the EVCC's GND to PE, protecting personnel from electric shock and providing a stable potential reference for the internal circuitry, preventing damage to precision components such as the SECC and EVCC from static electricity or leakage.

[0036] It should be noted that the various embodiments in this utility model are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0037] It should also be noted that, in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Additionally, the character " / " in this document generally indicates an "or" relationship between the preceding and following objects.

[0038] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined in the present invention may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A charging gun, characterized in that, include: Charging gun head, charging gun tail, PE connection wire and transmission cable; The CP contact of the charging gun head is connected to the core of the transmission cable. The transmission cable extends to the tail of the charging gun. The shielding component of the transmission cable is short-circuited with the PE connection line at the charging gun head. The core of the transmission cable at the tail of the charging gun is used to connect to the CP contact of an external charging pile. The shielding component of the transmission cable at the tail of the charging gun is used to connect to the GND contact of an external charging pile. One end of the PE connecting line is connected to the PE contact of the charging gun head, and the other end of the PE connecting line extends to the charging gun tail; the PE connecting line at the charging gun tail is used to connect to the grounding bar of the external charging pile.

2. The charging gun according to claim 1, characterized in that, The transmission cable includes coaxial cable or twisted pair cable.

3. The charging gun according to claim 2, characterized in that, When the transmission cable is a coaxial cable, the shielding layer of the coaxial cable is short-circuited with the PE connection line at the charging gun head.

4. The charging gun according to claim 2, characterized in that, When the transmission cable is a twisted pair, the shielding layer of the twisted pair is short-circuited with the PE connection line at the charging gun head.

5. The charging gun according to claim 1, characterized in that, The PE connecting wire is a yellow-green PE wire with a wire diameter that meets the specifications required for the rated current of the charging gun.

6. The charging gun according to claim 1, characterized in that, The charging gun is compatible with CCS1, CCS2, and NACS standards.

7. The charging gun according to claim 1, characterized in that, The distance between the transmission cable and the power cable in the charging gun is greater than a preset value.

8. A charging device, characterized in that, The device includes a charging pile and a charging gun as described in any one of claims 1 to 7, wherein the core of the transmission cable at the tail of the charging gun is connected to the CP terminal of the SECC in the charging pile, and the shielding component of the transmission cable at the tail of the charging gun is connected to the GND terminal of the SECC in the charging pile.

9. The charging device according to claim 8, characterized in that, The CP terminal of the charging gun head is used to connect to the CP terminal of the external vehicle charging interface, the PE terminal of the charging gun head is used to connect to the PE terminal of the external vehicle charging interface, and the PE terminal of the external vehicle charging interface is connected to the GND terminal of the EVCC in the external vehicle.

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