Direct current charging pile

Abstract

The invention discloses a direct current charging pile, which comprises a charging module, an intelligent compatible system, a heat dissipation module and a management unit, and is characterized in that the charging module is connected with an external power supply; and the intelligent compatible system is in electrical signal connection with the management unit, and is connected with the heat dissipation module and the charging module. According to the charging module and the dynamic charging strategy, the charging time can be shortened by 30%-50%, the intelligent compatibility system can adapt to more than 95% of electric vehicles of different brands and models on the market, the charging abnormity and connection problems are effectively reduced, and the use convenience of a user is improved. Through the composite heat dissipation mode and the optimized air duct design, the working temperature of key elements in the charging pile can be reduced by 15-20 DEG C, the service life of the elements is prolonged by 2-3 times, and the equipment failure rate is reduced. Through interaction with the intelligent power grid, the charging cost of a user can be reduced by 30%-40%, meanwhile, the effect of peak load shifting is achieved on the power grid, and the stability of the power grid and the energy utilization efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and more particularly to a direct current charging pile. Background Art

[0002] With the popularity of electric vehicles, the demand for charging piles is growing. Traditional DC charging piles have some shortcomings, such as:

[0003] Charging efficiency: The power of some charging piles is unstable during the charging process, and it is difficult to maintain high power output for a long time, resulting in a long overall charging time. For example, some early DC charging piles have high power in the initial stage of charging electric vehicles, but as the charging time increases, the power drops significantly. The power that was originally expected to be fully charged in 1 hour may actually take 1.52 hours.

[0004] Compatibility issues: Different brands and models of electric vehicle battery management systems (BMS) are different. Existing DC charging piles are difficult to adapt and communicate well with the BMS of various vehicles, which can easily lead to abnormal charging and failure to identify vehicles. For example, when charging some niche brand electric vehicles, a certain brand of charging pile frequently has connection errors and cannot start charging normally.

[0005] Heat dissipation problem: Charging piles generate a lot of heat when working. If the heat is not dissipated in time, it will affect the performance and life of the internal electronic components, and even cause safety hazards. The air cooling effect of many charging piles is limited. The heat dissipation effect is not good in high temperature environment or long-term continuous operation.

[0006] Energy utilization is not smart enough: There is a lack of effective interaction with the smart grid, and the charging strategy cannot be intelligently adjusted according to factors such as the load of the grid and the peak and valley changes in electricity prices to achieve efficient energy utilization and cost reduction. For example, during peak electricity consumption periods, charging piles still charge at conventional power, which not only increases electricity costs, but may also put greater pressure on the grid. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a DC charging pile, aiming to improve charging efficiency, enhance compatibility, optimize heat dissipation effect and realize intelligent utilization of energy, so as to solve the above-mentioned problems existing in existing DC charging piles.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] Charging module: Adopt new power electronic conversion technology to optimize the charging circuit topology. For example, the use of interleaved parallel DC-DC converters can effectively reduce current ripple, improve power density, and achieve more stable high-power output compared with traditional single-channel DC converters. Through precise voltage and current control algorithms, the charging parameters are dynamically adjusted in real time according to the battery state of the electric vehicle (such as remaining battery charge, battery temperature, battery health status, etc.) to ensure that charging can be carried out at the optimal power throughout the charging process, thereby significantly shortening the charging time.

[0010] Intelligent compatibility system: Design a general charging communication protocol parsing module, which can automatically identify the BMS communication protocol type of the connected vehicle and perform protocol conversion and adaptation. At the same time, establish a database containing various common electric vehicle BMS parameters and communication rules. When a newly connected vehicle is detected, quickly match the corresponding parameters and communication strategies from the database to achieve seamless communication between the charging pile and the vehicle BMS, ensuring the safety and stability of the charging process.

[0011] Heat dissipation module: Adopt a combined liquid cooling and air cooling heat dissipation method. Inside the charging pile, key heat-generating components (such as power modules, transformers, etc.) use a liquid cooling circulation system, and the coolant flows around the heat-generating components through specially designed pipes to efficiently remove heat. At the same time, an intelligent air cooling system is set on the outer shell of the charging pile, and the fan speed is automatically adjusted according to the temperature detected by the internal temperature sensor for auxiliary heat dissipation. In addition, optimize the air duct design inside the charging pile to enable more reasonable air circulation and further improve the heat dissipation efficiency.

[0012] Management unit: Equipped with an intelligent power grid interaction module, through data interaction with the power grid, the load information and peak-valley time periods of the power grid are obtained in real time. When the grid load is detected to be high, the charging power of the charging pile is automatically reduced; during the low-price period of the electricity price, according to the charging plan set by the user, the charging power is automatically increased to achieve low-cost charging. It can also use V2G (Vehicle-to-Grid) technology to reverse the electric energy in the electric vehicle battery back to the power grid when necessary, relieve the grid pressure, and achieve two-way flow and efficient utilization of energy.

[0013] As can be seen from the above technical solutions, compared with the prior art, the present invention discloses a DC charging pile, a charging module and a dynamic charging strategy, which can shorten the charging time by 30%-50%. Taking an electric vehicle with a cruising range of 500 kilometers as an example, using the charging pile of the present invention, the full charging time can be shortened from the traditional 1.5-2 hours to within 1 hour. The intelligent compatibility system can adapt to more than 95% of electric vehicles of different brands and models on the market, effectively reducing charging anomalies and connection problems, and improving the convenience of user use. The composite heat dissipation method and the optimized air duct design can reduce the operating temperature of the key components inside the charging pile by 15-20°C, extend the service life of the components by 2-3 times, and reduce the equipment failure rate. Through interaction with the smart grid, it can help users reduce the charging cost by 30%-40%, while playing a role in peak shaving and valley filling for the grid, improving the grid stability and energy utilization efficiency. Detailed Embodiment

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0015] A DC charging pile charging module uses interleaved parallel DC-DC converters to reduce current ripple and improve power density. Through precise voltage and current control algorithms, the charging parameters are dynamically adjusted in real time according to the remaining battery power, battery temperature and battery health status of the electric vehicle;

[0016] A DC charging pile intelligent compatibility system includes a general charging communication protocol parsing module and a database storing BMS parameters and communication rules of various common electric vehicles. The communication protocol parsing module can automatically identify the BMS communication protocol type of the connected vehicle and perform protocol conversion and adaptation;

[0017] A DC charging pile heat dissipation module uses a composite heat dissipation method combining liquid cooling and air cooling. The key heat-generating components are connected to the liquid cooling circulation system, and the charging pile shell is provided with an intelligent air cooling system that automatically adjusts the rotation speed according to the internal temperature, and the inside of the charging pile has an optimized air duct design;

[0018] A DC charging pile management unit is equipped with a smart grid interaction module for obtaining real-time grid load information and peak-valley periods of electricity prices, automatically adjusting the charging power according to the grid load, increasing the charging power according to the user-set charging plan during the low electricity price period, and supporting V2G technology to achieve two-way energy flow.

[0019] In the charging module, the interleaved parallel DC-DC converters adopt silicon carbide MOSFET power semiconductor devices, and the precise voltage and current control algorithms are implemented through a digital signal processor.

[0020] In the intelligent compatibility system, the communication protocol parsing module is implemented by a programmable logic device, and the database is constructed using a large-capacity flash memory chip and supports regular updates.

[0021] In the heat dissipation module, the coolant of the liquid cooling circulation system is an aqueous solution of propylene glycol. The coolant is driven to flow in the copper pipe by a circulation pump. The intelligent air cooling system uses a DC brushless fan, and the fan speed is adjusted through a closed-loop control system composed of a temperature sensor and a microcontroller.

[0022] The management unit realizes data interaction with the power grid through power line communication technology, adopts a bidirectional DC-DC converter to realize the V2G function, and is equipped with a human-machine interaction interface for users to set charging plans and display energy management information.

[0023] The charging module optimizes the charging circuit topology, enabling the DC charging pile to maintain a stable high-power output throughout the charging process. Compared with traditional charging piles, the charging time is shortened by 30% - 50%.

[0024] The intelligent compatibility system can adapt to the BMS communication protocols of more than 95% of different brands and models of electric vehicles on the market.

[0025] The heat dissipation module reduces the operating temperature of key components inside the charging pile by 15 - 20°C, extending the service life of the components by 2 - 3 times.

[0026] The management unit helps users reduce the charging cost by 30% - 40% and plays a role in peak shaving and valley filling for the power grid.

[0027] To further optimize the above technical solutions, the implementation method of the charging module: select high-performance power semiconductor devices (such as silicon carbide MOSFET) to build an interleaved parallel DC-DC converter, use a digital signal processor (DSP) to implement precise charging control algorithms, and realize real-time adjustment of charging parameters through programming.

[0028] The implementation method of the intelligent compatibility system: use a programmable logic device (CPLD) to implement the communication protocol parsing module, use a large-capacity flash memory chip to build a BMS parameter database, and regularly update the database to adapt to newly launched electric vehicles.

[0029] Implementation of the heat dissipation module: A coolant with high thermal conductivity (such as an aqueous solution of propylene glycol) is selected, and a circulating pump is used to drive the coolant to flow in the copper tube. The air-cooling system uses a DC brushless fan, and a closed-loop control system composed of a temperature sensor and a microcontroller is used to adjust the fan speed.

[0030] Implementation of the management unit: The power line communication (PLC) technology is used to achieve data interaction with the power grid, a bidirectional DC-DC converter is adopted to implement the V2G function, and a human-machine interface of the charging pile is used to provide users with charging plan setting and energy management information display.

[0031] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0032] 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 obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A DC charging pile, characterized in that, Including: A charging module, an intelligent compatibility system, a heat dissipation module, and a management unit. Among them, the charging module is connected to an external power supply; the intelligent compatibility system is electrically and signal-connected to the management unit and is connected to the heat dissipation module and the charging module.

2. A DC charging pile according to claim 1, characterized in that, The charging module uses interleaved parallel DC-DC converters, and through voltage and current control algorithms, it dynamically adjusts the charging parameters in real time according to the remaining battery power, battery temperature, and battery health status of the electric vehicle.

3. A DC charging pile according to claim 1, characterized in that, The intelligent compatibility system includes: an analysis module and a database. Among them, the analysis module is used to automatically identify the BMS communication protocol type of the connected vehicle and perform protocol conversion and adaptation. Multiple common electric vehicle BMS parameters and communication rules are stored in the database.

4. A DC charging pile according to claim 1, characterized in that The heat dissipation module adopts a composite heat dissipation method combining liquid cooling and air cooling.

5. A DC charging pile according to claim 1, characterized in that, The management unit is used to obtain the grid load information and the peak-valley periods of electricity prices in real time, automatically adjust the charging power according to the grid load, and increase the charging power according to the charging plan set by the user during the low electricity price period.

6. A DC charging pile according to claim 1, characterized in that The charging module is provided with interleaved parallel DC-DC converters. Among them, the DC converter uses silicon carbide MOSFET power semiconductor devices.

7. A DC charging pile according to claim 1, characterized in that, The management unit realizes data interaction with the grid through power line communication technology, adopts a bidirectional DC-DC converter to realize the V2G function, and is provided with a human-machine interaction interface for users to set charging plans and display energy management information.