Liquid cooling overcharge charging pile device based on 1kV high-voltage platform

Abstract

The invention discloses a liquid cooling overcharge charging pile device based on a 1kV high-voltage platform, and relates to the technical field of new energy automobile charging. Comprising a full-liquid-cooling rectifier cabinet, the full-liquid-cooling rectifier cabinet comprises a cabinet body, a positioning device, a cleaning device, a cold liquid box, a heat exchanger, a heat dissipation plate, a cable and a charging head, the positioning device and the cleaning device are installed on the outer side of the cabinet body, the cold liquid box and the heat exchanger are installed in the cabinet body, the cold liquid box is connected with the heat exchanger through a pipeline, and the heat dissipation plate is arranged on the cabinet body corresponding to the heat exchanger. A battery end in the cabinet body is connected with a cable, the other end of the cable extends out of the cabinet body and is connected with a charging head at the head part, a switch is arranged outside the full liquid cooling rectifier cabinet, and the switch is communicated with an ultrahigh switching frequency power module and an LLC resonant topology based on SiC MOSFETs, so that the switching frequency is increased to 150kHz; according to the liquid cooling parameters during internal circulation, the flow of cooling liquid is 10 L / min, the inlet temperature is smaller than or equal to 40 DEG C, the temperature rise is smaller than or equal to 15 DEG C, driving is conducted through a power pump, and heat of a cable and a power module is taken away; and during external circulation, a fin radiator is combined with a low-rotating-speed fan for heat dissipation.

Description

Technical Field

[0001] The present invention discloses a liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform, which relates to the technical field of new energy vehicle charging. Background Art

[0002] A new energy vehicle charging pile, also known as an electric vehicle charging station or an electric vehicle power supply device, is a device that provides electric energy for an electric vehicle, enabling the electric vehicle to store sufficient electric energy to support its operation.

[0003] Existing liquid-cooled ultra-fast charging piles are mostly based on an 800V platform and face the following problems:

[0004] 1. Efficiency bottleneck: The switching frequency of traditional IGBTs ≤ 50 kHz, the volume of magnetic components is large, and the power density is low;

[0005] 2. Heat dissipation challenge: When the current ≥ 500 A, it is difficult to control the temperature rise with air-cooled heat dissipation;

[0006] 3. Insufficient compatibility: It cannot be adapted to future 1000V models. Summary of the Invention

[0007] In view of the problems of the existing technology, the present invention provides a liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform, which has the characteristics of strong versatility and simple implementation, and has broad application prospects.

[0008] The specific solution proposed by the present invention is as follows:

[0009] The present invention provides a liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform, including: a fully liquid-cooled rectifier cabinet, which includes a cabinet body, a positioning device, a cleaning device, a cold liquid box, a heat exchanger, a heat dissipation plate, a cable, and a charging head. The positioning device and the cleaning device are installed on the outer side of the cabinet body, the cold liquid box and the heat exchanger are installed inside the cabinet body, the cold liquid box is connected to the heat exchanger through a pipeline, a heat dissipation plate is opened on the cabinet body opposite to the heat exchanger, the battery end inside the cabinet body is connected to the cable, and the other end of the cable extends out of the cabinet body and is connected to the charging head at the head.

[0010] A switch is provided outside the fully liquid-cooled rectifier cabinet, and the switch is connected to an ultra-high switching frequency power module based on the LLC resonant topology of SiC MOSFET, so that the switching frequency is increased to 150 kHz;

[0011] A double-cycle liquid-cooling system is built in the fully liquid-cooled rectifier cabinet: During the inner cycle, the liquid-cooling parameters are: the coolant flow rate is 10 L / min, the inlet temperature ≤ 40 °C, and the temperature rise ≤ 15 °C. Driven by a power pump, it takes away the heat of the cable and the power module; During the outer cycle, a fin radiator combined with a low-speed fan is used for heat dissipation.

[0012] Further, in the liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform, a C3M0065100K SiC MOSFET component of CREE is used as the power module.

[0013] Further, the liquid-cooling parameters of the all-liquid-cooled rectifier cabinet in the liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform are as follows: the coolant flow rate is 10 L / min, the inlet temperature ≤ 40 °C, and the temperature rise ≤ 15 °C.

[0014] Further, in the liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform, HQ-C1 type coolant is used for liquid-cooling circulation.

[0015] Further, in the liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform, the pipeline connecting the cold liquid box and the heat exchanger uses a liquid-cooled cross-linked polyethylene insulated cable with a voltage withstand level of 1 kV.

[0016] Further, in the liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform, during external circulation, a fin radiator with an area of 2 m 2 is used in combination with a low-speed axial flow fan with 1200 rpm for heat dissipation.

[0017] Further, in the liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform, a high-voltage DC / DC converter is integrated at the battery end inside the cabinet to achieve the conversion of 1000 V to 800 V.

[0018] The present invention also uses the liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform to charge new energy vehicles.

[0019] The advantages of the present invention are as follows:

[0020] The present invention adopts an all-liquid-cooled rectifier cabinet and a charging terminal, based on a 1 kV high-voltage platform architecture, supports a maximum single-gun current of 700 A, the charging power reaches more than 600 kW, and is compatible with 800 V - 1000 V models; the present invention has a super-high switching frequency design: based on the LLC resonant topology of SiC MOSFET, the switching frequency is increased to 100 kHz - 200 kHz, reducing the volume of magnetic components, and the power density reaches 0.83 W / mm 2 , with the dynamic power distribution technology DPA, which can match the vehicle demand power and module resources in real time, and improve the system resource utilization rate by more than 10%; the present invention adopts a double-cycle liquid-cooling system: the internal liquid-cooling module dissipates heat through the circulation of low-conductivity coolant, and the external uses a large-air-volume low-speed fan with a noise lower than 55 dB. Efficiency index: the comprehensive conversion efficiency ≥ 95%, and the heat loss is reduced by 30%. Description of the Drawings

[0021] Figure 1This is a schematic diagram of the structure of the fully liquid-cooled rectifier cabinet of the present invention. Detailed implementation manners

[0022] File link: Specify another name and path that can be used to access a certain existing file in the system, including soft links and hard links.

[0023] Daemon process: A special process that runs in the background and is used to execute specific system tasks. It is generally started when the system boots and runs until the system shuts down.

[0024] SDN: Refers to software-defined network, a new type of network innovation architecture, which is an implementation method of network virtualization. Its core technology OpenFlow separates the control plane and data plane of network devices, thus realizing flexible control of network traffic, making the network more intelligent as a pipeline, and providing a good platform for the innovation of core networks and applications. It generally consists of a management and control platform and N controlled network devices.

[0025] SDWAN: Software-defined wide area network, which is a service formed by applying SDN technology to the wide area network scenario. This service is used to connect enterprise networks, data centers, Internet applications, and cloud services in a wide geographical area.

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the specific embodiments cited are not intended to limit the present invention.

[0027] Embodiment 1

[0028] The present invention provides a liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform, including: a fully liquid-cooled rectifier cabinet, the fully liquid-cooled rectifier cabinet includes a cabinet body 1, a positioning device 2, a cleaning device 3, a cold liquid box 4, a heat exchanger 5, a heat dissipation plate 6, a cable 7, and a charging head 8. The positioning device 2 and the cleaning device 3 are installed on the outer side of the cabinet body 1, the cold liquid box 4 and the heat exchanger 5 are installed inside the cabinet body 1, the cold liquid box 4 is connected to the heat exchanger 5 through a pipeline, a heat dissipation plate 6 is opened on the cabinet body 1 opposite to the heat exchanger 5, the battery end inside the cabinet body 1 is connected to the cable 7, and the other end of the cable 7 extends out of the cabinet body 1 and is connected to the charging head 8 at the head.

[0029] A switch is provided outside the fully liquid-cooled rectifier cabinet, and the switch is connected to an ultra-high switching frequency power module, based on the LLC resonance topology of SiC MOSFET, to increase the switching frequency to 150 kHz;

[0030] Full liquid-cooled rectifier cabinet with built-in dual-cycle liquid cooling system: During the internal cycle, the liquid cooling parameters are as follows: coolant flow rate is 10 L / min, inlet temperature ≤ 40°C, temperature rise ≤ 15°C. Driven by a power pump, it takes away the heat of the cables and power modules. During the external cycle, finned radiators are combined with low-speed fans for heat dissipation.

[0031] In the present invention, the full liquid-cooled rectifier cabinet can use the C3M0065100K SiC MOSFET component of CREE Company as the power module. The C3M0065100K SiC MOSFET component has high voltage withstand capacity: drain-source breakdown voltage (Vds): 1000V, ensuring reliability in high-voltage applications; large current handling capacity: continuous drain current (Id): 35A, suitable for high-power loads; low on-resistance: drain-source on-resistance (Rds(on)): as low as 65 mΩ, effectively reducing conduction losses and improving energy efficiency; fast switching characteristics: rise time (Tr): 10 ns, fall time (Tf): 8 ns; low output capacitance: contributing to high-frequency switching and reducing switching losses. High-temperature operating ability: operating temperature range: -55°C to 150°C, adapting to harsh environments. Optimized package design: It can adopt TO-247-4 package with Kelvin source pins, which can reduce switching losses and gate ringing.

[0032] Set the liquid cooling parameters of the full liquid-cooled rectifier cabinet as follows: coolant flow rate is 10 L / min, inlet temperature ≤ 40°C, temperature rise ≤ 15°C.

[0033] And use HQ-C1 type coolant for liquid cooling circulation. HQ-C1 type coolant is applicable to the liquid cooling thermal management systems of various types of new energy vehicle charging piles, especially high-power DC charging piles. By using HQ-C1 type coolant, the heat dissipation efficiency of the charging pile can be effectively improved, the equipment failure rate can be reduced, the service life of the equipment can be extended, and the overall operation benefit of the charging facilities can be enhanced.

[0034] In the liquid-cooled ultra-fast charging pile device based on a 1kV high-voltage platform, the pipeline connecting the cold liquid box and the heat exchanger uses a liquid-cooled cross-linked polyethylene insulated cable with a voltage withstand level of 1kV.

[0035] During the external cycle, an area of 2m 2The fin radiator is combined with a low-speed axial fan with a speed of 1200 rpm for heat dissipation. The fin radiator increases the heat dissipation area by adding fins to the base tube, thereby improving the heat conduction and dissipation efficiency. The fin radiator has various structural forms, such as wound fin type, string fin type, welded fin type, rolled fin type, etc. Among them, the steel-aluminum composite fin tube combines the pressure resistance of the steel tube and the high thermal conductivity of aluminum. The axial fan is a common heat dissipation fan with the same air inlet and outlet directions, featuring a large air volume and low pressure. The 1200-rpm low-speed axial fan reduces noise and energy consumption while ensuring a certain air volume, making it suitable for applications that require a quiet and energy-saving environment. The advantages of the low-speed axial fan include: Low noise: The low speed means that the fan generates less noise, making it suitable for occasions that require a quiet environment. Low energy consumption: The reduced speed means that the energy consumption of the fan also decreases, contributing to energy conservation and emission reduction. Large air volume: Despite the low speed, the axial fan can still provide a large air volume to meet the heat dissipation requirements.

[0036] In the liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform, a battery-side integrated high-voltage DC / DC converter is installed inside the cabinet 1 to achieve the conversion from 1000 V to 800 V.

[0037] Embodiment 2

[0038] The present invention also uses the liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform for charging new energy vehicles.

[0039] It is suitable for charging various existing new energy vehicles. And through testing, the liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform of the present invention can achieve:

[0040] Charging efficiency: The comprehensive conversion efficiency ≥ 95% (traditional pile ≤ 92%), and the heat loss is reduced by 30%;

[0041] Lightweight: The diameter of the liquid-cooled cable is reduced by 40%, and the weight of the gun line is reduced by 35%;

[0042] Compatibility: It is compatible with 800V / 1000V models and can intelligently identify the maximum charging current.

[0043] The above-described embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. A liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform, characterized in that Including: A fully liquid-cooled rectifier cabinet, which includes a cabinet body, a positioning device, a cleaning device, a cold liquid box, a heat exchanger, a heat dissipation plate, cables and a charging head. The positioning device and the cleaning device are installed on the outer side of the cabinet body, the cold liquid box and the heat exchanger are installed inside the cabinet body, the cold liquid box is connected to the heat exchanger through a pipeline, a heat dissipation plate is opened on the cabinet body opposite to the heat exchanger, the battery end inside the cabinet body is connected to the cables, and the other end of the cables extends out of the cabinet body and is connected to the charging head at the head. A switch is provided outside the fully liquid-cooled rectifier cabinet, and the switch is connected to a very high switching frequency power module. Based on the LLC resonant topology of SiC MOSFET, the switching frequency is increased to 150 kHz. The fully liquid-cooled rectifier cabinet is internally equipped with a double-cycle liquid cooling system: during the internal cycle, the liquid cooling parameters are: the coolant flow rate is 10 L / min, the inlet temperature ≤ 40 °C, and the temperature rise ≤ 15 °C. It is driven by a power pump to take away the heat of the cables and the power module; during the external cycle, a fin radiator combined with a low-speed fan is used for heat dissipation.

2. The liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform according to claim 1, wherein The C3M0065100K SiC MOSFET component of CREE Company is used as the power module.

3. The liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform according to claim 1, characterized in that The liquid cooling parameters of the fully liquid-cooled rectifier cabinet are: the coolant flow rate is 10 L / min, the inlet temperature ≤ 40 °C, and the temperature rise ≤ 15 °C.

4. The liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform according to claim 1, characterized in that The HQ-C1 type coolant is used for liquid cooling circulation.

5. The liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform according to claim 1, characterized in that The pipeline connecting the cold liquid box and the heat exchanger uses a liquid-cooled cross-linked polyethylene insulated cable with a voltage withstand level of 1 kV.

6. The liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform according to claim 1, characterized in that When in the outer loop, an area of 2 m is adopted. 2 The fin radiator is combined with a low-speed axial fan of 1200 rpm for heat dissipation.

7. A liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform according to claim 1, characterized in that A high-voltage DC / DC converter is integrated at the battery end inside the cabinet body to achieve the conversion from 1000 V to 800 V.

8. Use the liquid-cooled ultra-fast charging pile device based on a 1 kV high-voltage platform described in any one of claims 1-7 to charge new energy vehicles.

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