Improved charging pile electric gun protection strategy

Abstract

The invention discloses an improved charging pile electric gun protection strategy, and the method comprises the steps: obtaining a charging gun temperature sampling value in real time through a DC charging controller (CCU) in a charging process; different measures are taken according to different temperature intervals: normal charging is carried out when the temperature is less than 70 DEG C; an alarm is given at 70-80 DEG C, but charging is not affected; the charging power is reduced at the temperature of 80-90 DEG C; and stopping charging when the temperature is greater than or equal to 90 DEG C, and operating according to a specific sequence to avoid on-load cutting of the contactor. Meanwhile, temperature data are obtained through wired communication, instructions are transmitted through a CAN bus, and a data storage module is arranged. The strategy improves the use efficiency and service life of the charging gun, protects the high-voltage equipment, and improves the charging safety and stability.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle charging, and in particular to an improved charging pile electric gun protection strategy. Background Art

[0002] With the increasing attention paid to environmental protection and the implementation of low-carbon emission strategies around the world, new energy vehicles have developed rapidly in recent years due to their environmental protection and high efficiency. As a key supporting facility for new energy vehicles, the importance of charging piles is self-evident. As the core component connecting new energy vehicles and charging piles, the performance of the charging gun is directly related to the safety and stability of the charging process.

[0003] At present, during the charging process, the temperature of the charging gun will rise significantly after a long time or high-power charging. This is a common problem that needs to be solved urgently. In the prior art, the common charging gun temperature protection technology is to obtain the gun temperature through the temperature sensor in the charging gun. When the gun temperature exceeds the specified temperature, the charging process is immediately terminated. This method is called load cutoff. This protection technology has many defects:

[0004] 1. The lack of reasonable division of over-temperature ranges makes it impossible to make targeted adjustments to the charging gun under different temperature conditions, and the charging gun cannot be used efficiently. Moreover, when the gun temperature is high but has not reached the temperature for cutting off charging, there is no protection measure, causing the charging gun to be in a high temperature state for a long time, which is easy to cause damage.

[0005] 2. When the load is disconnected, the high-voltage contactor is disconnected under full load or overload, which can easily cause the high-voltage contactor contact to stick or burn. Once this happens, it will cause serious damage to the high-voltage power distribution device and high-voltage equipment of the charging pile, and even bring devastating consequences, which will not only increase the maintenance cost, but also affect the normal use of the charging pile, causing great inconvenience to users.

[0006] Therefore, we propose an improved charging pile electric gun protection strategy. Summary of the invention

[0007] The main purpose of the present invention is to propose an improved charging pile electric gun protection strategy, which can effectively solve the problems in the background technology.

[0008] To achieve the above object, the technical solution adopted by the present invention is: an improved charging pile electric gun protection strategy, including that during the charging process, a DC charging controller (CCU) obtains a temperature sampling value from a temperature sensor in the charging gun in real time;

[0009] The following processing is performed according to the temperature sampling value: when the temperature is less than 70 degrees Celsius, the normal charging process is maintained;

[0010] When the temperature is greater than or equal to 70 degrees Celsius and less than 80 degrees Celsius and is maintained for 10 seconds, the DC charging controller (CCU) sends a fault code 0x0313F0 to the energy management system controller (EMS). This fault code is defined as a level 1 charging gun over-temperature fault, which only alarms in the energy management system controller (EMS) and does not affect the charging process.

[0011] When the temperature is greater than or equal to 80 degrees Celsius and less than 90 degrees Celsius and is maintained for 7 seconds, the DC charging controller (CCU) sends a fault code 0x0134F1 to the energy management system controller (EMS). This fault code is defined as a level 2 charging gun over-temperature fault. The energy management system controller (EMS) sends an instruction to reduce the set current of the power module by half, reducing the charging power by half, and the charging process continues.

[0012] When the temperature is greater than or equal to 90 degrees Celsius and is maintained for 7 seconds, the DC charging controller (CCU) sends a fault code 0x0135F2 to the energy management system controller (EMS). This fault code is defined as a level 3 charging gun over-temperature fault. The energy management system controller (EMS) first sends a CTS stop charging message to the vehicle, then issues a shutdown instruction to the power module. The power module shuts down, and the output voltage and output current both become 0. Then the vehicle end disconnects the C5 / C6 contactors, and the charging pile disconnects the C1 / C2 contactors.

[0013] As a further description of the above technical solution, the DC charging controller (CCU) is connected to the temperature sensor in the charging gun through a wired communication method to ensure real-time and stable acquisition of temperature sampling values.

[0014] As a further description of the above technical solution, the energy management system controller (EMS) and the power module use CAN bus communication to achieve fast and accurate transmission of instructions.

[0015] As a further description of the above technical solution, a data storage module is also set up during the temperature monitoring process.

[0016] As a further description of the above technical solution, the data storage module is used to record temperature data and corresponding charging status information at different stages for subsequent analysis and optimization of the charging process.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Improve the usage efficiency and lifespan of the charging gun: By adding over-temperature level judgment and taking different measures, when the temperature of the charging gun is in a relatively low over-temperature range, continuous charging is allowed and a warning is issued, enabling the charging gun to be used as efficiently as possible under safe conditions. At the same time, corresponding measures are taken in a timely manner at different over-temperature levels, avoiding the charging gun being in a high-temperature state for a long time, effectively protecting the charging gun and extending its lifespan.

[0019] 2. Protect high-voltage equipment: When stopping discharging, a scheme is adopted where the power module is first shut down to make the output voltage and current become 0, and then the contactor is disconnected, ensuring that the high-voltage contactor is cut off without load. This measure effectively avoids the problems of contact adhesion or ablation of the high-voltage contactor, not only protecting the charging gun of the charging pile, but also protecting the charging socket of the vehicle, as well as the high-voltage power distribution device and other high-voltage equipment of the charging pile, reducing the risk of equipment damage and improving the safety and reliability of the entire charging system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a flowchart of the charging process of an improved charging gun protection strategy of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] To make the technical means, creative features, achieved objectives, and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Please refer to Figure 1 , the present invention provides a technical solution: an improved charging gun protection strategy for a charging pile, specifically:

[0025] Temperature Monitoring and Hierarchical Processing: During the charging process, the DC charging controller (CCU) undertakes the crucial task of real-time monitoring of the charging gun temperature. It works closely with the temperature sensor in the charging gun to continuously obtain temperature sampling values. When the temperature is in different ranges, the system will perform different operations: when the temperature is less than 70 degrees Celsius, it indicates that the charging gun is in normal working condition, and at this time, the system maintains the normal charging process without additional intervention.

[0026] When the temperature reaches the range of "greater than or equal to 70 degrees Celsius and less than 80 degrees Celsius" and remains for 10s, the DC charging controller (CCU) will quickly respond and send a fault code 0x0313F0 to the energy management system controller (EMS). This fault code is defined as the over-temperature level 1 fault of the charging gun. At this time, the system only gives an alarm prompt in the energy management system controller (EMS), and the charging process is not affected. This can not only let the user know the temperature situation of the charging gun in time but also ensure the continuity of charging.

[0027] When the temperature further rises to the range of "greater than or equal to 80 degrees Celsius and less than 90 degrees Celsius" and remains for 7s, the DC charging controller (CCU) sends a fault code 0x0134F1 to the energy management system controller (EMS). This fault code represents the over-temperature level 2 fault of the charging gun. To protect the charging gun, the energy management system controller (EMS) will send an instruction to the power module to reduce the set current by half. After receiving the instruction, the power module will immediately execute the operation to halve the output current, thereby reducing the charging power by half, and at the same time, the charging process continues, which alleviates the overheating problem of the charging gun to a certain extent.

[0028] When the temperature reaches "greater than or equal to 90 degrees Celsius" and remains for 7s, the situation is relatively critical. The DC charging controller (CCU) sends a fault code 0x0135F2 to the energy management system controller (EMS), that is, the over-temperature level 3 fault of the charging gun. At this time, the energy management system controller (EMS) will start a series of orderly charging stop operations: first, send a CTS stop charging message to the vehicle to notify the vehicle to stop charging; then send a shutdown instruction to the power module. After receiving the instruction, the power module quickly shuts down, making the output voltage and output current both become 0; subsequently, the vehicle end disconnects the C5 / C6 contactors, and the charging pile disconnects the C1 / C2 contactors. Through this operation sequence, the problem of cutting off the contactors under load is avoided, effectively protecting the high-voltage contactors and related equipment of the charging pile and the vehicle.

[0029] Communication and Data Storage Assistance: To ensure the stable operation of the entire protection strategy, the DC charging controller (CCU) is connected to the temperature sensor in the charging gun through a wired communication method. This connection method can guarantee the stability and real-time nature of data transmission, avoiding inaccurate acquisition of temperature data due to problems such as wireless communication interference. At the same time, the energy management system controller (EMS) and the power module communicate via the CAN bus. The CAN bus has advantages such as high communication rate and strong reliability, and can transmit instructions quickly and accurately to ensure the timely and effective adjustment of the charging power by the system. In addition, a data storage module is set up in the system, which can record the temperature data at different stages and the corresponding charging status information. These data provide a strong basis for subsequent analysis and optimization of the charging process.

[0030] It should be noted that the present invention is an improved protection strategy for the charging gun of a charging pile. First, device connection and initialization are carried out. In the actual application scenario, first ensure that the physical connection between the charging pile, the charging gun, and the vehicle is correct. Connect devices such as the DC charging controller (CCU), the energy management system controller (EMS), and the power module according to the design requirements. At the same time, ensure that the temperature sensor in the charging gun is stably connected to the DC charging controller (CCU) through a wired communication method, and the energy management system controller (EMS) is connected to the power module through the CAN bus. After the connection is completed, perform initialization settings for each device to ensure that the devices are in a normal working state; when the charging process starts, the DC charging controller (CCU) begins to obtain real-time temperature sampling values from the temperature sensor in the charging gun. Suppose that during a certain charging process, the initial temperature of the charging gun is 50 degrees Celsius. At this time, the system determines that the temperature is less than 70 degrees Celsius, and the charging process proceeds normally. As the charging time passes, the temperature of the charging gun gradually rises. When the temperature reaches 75 degrees Celsius and remains for 10 s, the DC charging controller (CCU) sends a fault code 0x0313F0 to the energy management system controller (EMS). After receiving the fault code, the energy management system controller (EMS) gives an alarm prompt inside it, but the charging process is not affected. If the temperature continues to rise and reaches 85 degrees Celsius and remains for 7 s, the DC charging controller (CCU) sends a fault code 0x0134F1 to the energy management system controller (EMS). After receiving this fault code, the energy management system controller (EMS) immediately sends an instruction to the power module to reduce the set current by half. After receiving the instruction, the power module quickly adjusts the output current to reduce the charging power by half, and the charging process continues. When the temperature further rises to 95 degrees Celsius and remains for 7 s, the DC charging controller (CCU) sends a fault code 0x0135F2 to the energy management system controller (EMS). The energy management system controller (EMS) first sends a CTS stop charging message to the vehicle. After receiving the message, the vehicle prepares to stop charging; then the energy management system controller (EMS) issues a shutdown instruction to the power module, and the power module shuts down, and the output voltage and output current become 0; subsequently, the vehicle end disconnects the C5 / C6 contactors, and the charging pile disconnects the C1 / C2 contactors to complete the entire stop charging process; during the entire charging process, the data storage module continuously records the temperature data and the corresponding charging status information. For example, record the time when the temperature reaches different over-temperature levels each time, the time and value of the charging power adjustment, etc. These data can be analyzed through professional data analysis software after the charging is completed. By analyzing these data, the temperature change law of the charging gun under different charging conditions can be understood, providing data support for further optimizing the charging strategy and improving the charging equipment. For example, if it is found that a certain batch of charging guns frequently overheat under the same charging conditions, the heat dissipation design or other related components of this batch of charging guns can be improved.Compared with the existing improved protection strategies for charging gun of charging piles, the present invention improves the usage efficiency and service life of the charging gun through design, protects high-voltage equipment, and enhances the charging safety and stability.

[0031] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An improved charging pile electric gun protection strategy, characterized in that: The following steps are involved: During the charging process, the DC charging controller (CCU) obtains the temperature sampling value from the temperature sensor in the charging gun in real time; The following processing is performed according to the temperature sampling value: when the temperature is less than 70 degrees Celsius, the normal charging process is maintained; When the temperature is greater than or equal to 70 degrees Celsius and less than 80 degrees Celsius and maintains for 10 seconds, the DC charging controller (CCU) sends the fault code 0x0313F0 to the energy management system controller (EMS). This fault code is defined as a charging gun overtemperature level 1 fault. It only alarms in the energy management system controller (EMS) and does not affect the charging process. When the temperature is greater than or equal to 80 degrees Celsius and less than 90 degrees Celsius and maintains for 7 seconds, the DC charging controller (CCU) sends the fault code 0x0134F1 to the energy management system controller (EMS). This fault code is defined as a level 2 overtemperature fault of the charging gun. The energy management system controller (EMS) sends a command to the power module to reduce the set current by half, so that the charging power is reduced by half, and the charging process continues; When the temperature is greater than or equal to 90 degrees Celsius and maintains for 7s, the DC charging controller (CCU) sends the fault code 0x0135F2 to the energy management system controller (EMS). This fault code is defined as a level 3 charging gun overtemperature fault. The energy management system controller (EMS) first sends a CTS stop charging message to the vehicle, and then sends a shutdown command to the power module. The power module shuts down, and the output voltage and output current both become 0. Then the vehicle end disconnects the C5 / C6 contactor, and the charging pile disconnects the C1 / C2 contactor.

2. According to claim 1, an improved charging pile electric gun protection strategy is characterized in that: The DC charging controller (CCU) is connected to the temperature sensor in the charging gun via wired communication to ensure real-time and stable acquisition of temperature sampling values.

3. The improved charging pile electric gun protection strategy according to claim 1 is characterized in that: The energy management system controller (EMS) and the power module communicate via the CAN bus to achieve fast and accurate instruction transmission.

4. The improved charging pile electric gun protection strategy according to claim 1 is characterized in that: During the temperature monitoring process, a data storage module is also provided.

5. An improved charging pile electric gun protection strategy according to claim 4, characterized in that: The data storage module is used to record temperature data at different stages and corresponding charging status information, so as to analyze and optimize the charging process later.

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