An intelligent protection system, method, device and medium for a fast-charging relay

Abstract

This application provides an intelligent protection system, method, device, and medium for a fast-charging relay. The battery management module obtains the available current value at the charging pile's terminal in real time. The on-board charging module monitors the current temperature of the fast-charging relay in real time. When the vehicle's main control module determines that the fast-charging relay has reached a preset state, it sends a first charging command to the battery management module to drive the on-board charging module to charge the power battery according to the current available charging current value, and drives a cooling device to cool the fast-charging relay so that its current temperature is below a first temperature threshold. Through this system and method, the cooling device cools the fast-charging relay, preventing abnormal fast-charging stoppage caused by the relay automatically disconnecting due to overheating, thus improving the fast-charging efficiency of electric vehicles and enhancing the user experience.

Description

Technical Field

[0001] This application relates to the field of intelligent vehicle technology, and in particular to an intelligent protection system, method, device and medium for a fast charging relay. Background Technology

[0002] With increasing environmental awareness and the development of science and technology, new energy vehicles are becoming more and more well-known and used. To address the issue of slow charging, existing electric vehicles have incorporated fast charging capabilities, which require fast charging relays. In the fast charging circuit of an electric vehicle, the connection between the power battery and the charging port is controlled by a fast charging relay.

[0003] In fast charging scenarios, high-power charging causes the temperature of the fast charging relay to rise. When the temperature is too high, the fast charging relay will automatically disconnect physically, causing the fast charging to stop abnormally. After prolonged use under unexpected and complex operating conditions, the relay's lifespan decreases, its working capacity weakens, and it seriously affects the fast charging efficiency of electric vehicles. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide an intelligent protection system, method, device and medium for fast charging relays. By monitoring the temperature value of the fast charging relay in real time through the on-board charging module and cooling the fast charging relay through a cooling device, the performance of the fast charging relay can be delayed, avoiding abnormal fast charging stop caused by the fast charging relay automatically disconnecting due to excessive temperature. This improves the fast charging efficiency of electric vehicles and also enhances the user experience.

[0005] In a first aspect, embodiments of this application provide an intelligent protection system for a fast charging relay, the intelligent protection system including a battery management module, an on-board charging module, and a vehicle main control module; The battery management module is used to obtain the available current value at the charging pile end of the fast charging pile in real time, and send the available current value at the charging pile end and the current chargeable current value of the power battery to the vehicle main control module. The on-board charging module is used to monitor the current temperature value of the fast charging relay in real time, determine the first relay load current value and relay duration corresponding to the current temperature value from the relay test data table, and send the current temperature value, the first relay load current value and the relay duration to the vehicle main control module. The vehicle main control module is used to send a first charging command to the battery management module when it is determined that the fast charging relay has reached a preset state based on the available current value at the charging pile end, the current rechargeable current value, the current temperature value, the load current value of the first relay, and the relay duration. This command drives the on-board charging module to charge the power battery according to the current rechargeable current value, and drives the cooling device to cool the fast charging relay so that the current temperature value of the fast charging relay is lower than a first temperature threshold.

[0006] Furthermore, the cooling device is a water pump and a fan connected to the cooling water channel in the on-board charging module, and the fast charging relay is located next to the cooling water channel in the on-board charging module.

[0007] Furthermore, the on-board charging module includes a temperature sensor, which is connected to the fast charging relay; The temperature sensor is used to detect the current temperature value of the fast charging relay in real time and send the current temperature value to the vehicle main control module.

[0008] Furthermore, the vehicle main control module is also used to determine whether the fast charging relay has reached a preset state through the following steps: The current state of charge data of the power battery is obtained, and the remaining time for the power battery to complete charging is determined based on the current state of charge data and the available current value at the charging pile end. When it is determined that the load current value of the first relay is greater than the smaller value between the available current value at the pile end and the current chargeable current value, and the relay duration is greater than or equal to the remaining time, and the current temperature value is less than the first temperature threshold, then the fast charging relay is considered to have reached a preset state.

[0009] Furthermore, when the vehicle main control module determines that the fast charging relay has not reached a preset state, the vehicle main control module is also used to: When it is determined that the current temperature value is less than the first temperature threshold and greater than the second temperature threshold, and the duration of the relay is less than the remaining time, the cooling device is driven to cool down the fast charging relay. The current temperature value of the fast charging relay is obtained from the vehicle charging module in real time. When it is determined that the current temperature value is less than or equal to the second temperature threshold, the second relay load current value corresponding to the second temperature threshold is determined from the relay experimental data table. A first minimum current value is determined from the second relay load current value, the available current value at the pile end, and the current rechargeable current value, and a second charging command is sent to the battery management module to drive the on-board charging module to charge the power battery according to the first minimum current value.

[0010] Furthermore, when the vehicle main control module determines that the fast charging relay has not reached a preset state, the vehicle main control module is also used to: When it is determined that the current temperature value is greater than the first temperature threshold and the relay duration is greater than the remaining time, the cooling device is driven to cool down the fast charging relay. The current temperature value of the fast charging relay is obtained from the vehicle charging module in real time. When it is determined that the current temperature value is less than or equal to the first temperature threshold, the load current value of the third relay corresponding to the first temperature threshold is determined from the relay experimental data table. The second minimum current value is determined from the load current value of the third relay, the available current value at the pile end, and the current rechargeable current value, and a third charging command is sent to the battery management module to drive the on-board charging module to charge the power battery according to the second minimum current value.

[0011] Secondly, embodiments of this application also provide an intelligent protection method for a fast-charging relay. This intelligent protection method is applied to an intelligent protection system for the fast-charging relay, the intelligent protection system including a battery management module, an on-board charging module, and a vehicle main control module; the intelligent protection method includes: The battery management module is controlled to obtain the available current value at the charging pile in real time from the fast charging pile, and send the available current value at the charging pile and the current chargeable current value of the power battery to the vehicle main control module. The vehicle charging module is controlled to monitor the current temperature value of the fast charging relay in real time, determine the first relay load current value and relay duration corresponding to the current temperature value from the relay test data table, and send the current temperature value, the first relay load current value and the relay duration to the vehicle main control module. When the vehicle main control module determines that the fast charging relay has reached a preset state based on the available current value at the charging pile, the current rechargeable current value, the current temperature value, the load current value of the first relay, and the relay duration, it sends a first charging command to the battery management module to drive the on-board charging module to charge the power battery according to the current rechargeable current value, and drives the cooling device to cool the fast charging relay so that the current temperature value of the fast charging relay is lower than a first temperature threshold.

[0012] Furthermore, the cooling device is a water pump and a fan connected to the cooling water channel in the on-board charging module, and the fast charging relay is located next to the cooling water channel in the on-board charging module.

[0013] Thirdly, embodiments of this application also provide an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, the steps of the smart protection method for the fast-charging relay described above are performed.

[0014] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the smart protection method for the fast-charging relay described above.

[0015] This application provides an intelligent protection system, method, device, and medium for a fast-charging relay. The intelligent protection system includes a battery management module, an on-board charging module, and a vehicle main control module. The battery management module obtains the available current value at the charging pile terminal from the fast-charging pile in real time and sends the available current value at the charging pile terminal and the current chargeable current value of the power battery to the vehicle main control module. The on-board charging module monitors the current temperature value of the fast-charging relay in real time, determines the first relay load current value and relay duration corresponding to the current temperature value from the relay experimental data table, and transmits the current temperature value... The first relay's load current value and the relay's duration are sent to the vehicle's main control module. When the vehicle's main control module determines that the fast-charging relay has reached a preset state based on the available current value at the charging pile, the current rechargeable current value, the current temperature value, the first relay's load current value, and the relay's duration, it sends a first charging command to the battery management module to drive the on-board charging module to charge the power battery according to the current rechargeable current value, and drives the cooling device to cool the fast-charging relay so that the current temperature value of the fast-charging relay is lower than a first temperature threshold.

[0016] This application adds a temperature monitoring and cooling device for the fast-charging relay of electric vehicles. The onboard charging module monitors the temperature of the fast-charging relay in real time, and the cooling device lowers its temperature. In high-power charging scenarios, this ensures the relay's temperature remains below a first temperature threshold, within its lifespan requirement, allowing it to operate at its maximum capacity. This delays the relay's performance and prevents abnormal fast-charging stoppage caused by overheating, improving fast-charging efficiency and enhancing the user experience.

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is one of the structural schematic diagrams of an intelligent protection system for a fast-charging relay provided in an embodiment of this application; Figure 2 A second schematic diagram of the structure of an intelligent protection system for a fast-charging relay provided in an embodiment of this application; Figure 3 A flowchart illustrating an intelligent protection method for a fast-charging relay provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.

[0021] First, the applicable scenarios for this application will be introduced. This application can be applied to the field of intelligent vehicle technology.

[0022] Based on this, the embodiments of this application provide an intelligent protection system for a fast charging relay, which avoids abnormal fast charging stop caused by the fast charging relay automatically disconnecting due to excessive temperature, thereby improving the fast charging efficiency of electric vehicles and enhancing the user experience.

[0023] Please see Figure 1 , Figure 1 This is one of the structural schematic diagrams of an intelligent protection system for a fast-charging relay provided in an embodiment of this application. For example... Figure 1 As shown in the figure, the intelligent protection system 10 provided in this application embodiment includes a battery management module 110, an on-board charging module 120, and a vehicle main control module 130.

[0024] The battery management module 110 is used to obtain the available current value at the charging pile end of the fast charging pile in real time, and send the available current value at the charging pile end and the current chargeable current value of the power battery to the vehicle main control module 130.

[0025] Here, the available current value at the charging pile refers to the maximum current value that the fast charging pile can currently output, which is the current maximum capacity of the fast charging pile. The current chargeable current value refers to the maximum current that the power battery in the electric vehicle can currently accept, which is the current maximum capacity of the power battery itself.

[0026] Here, the battery management module 110 refers to the BMS (Battery Management System) in an electric vehicle. In specific implementation, when the electric vehicle is fast charging, the charging port of the electric vehicle is connected to the fast charging gun of the fast charging pile. The battery management module 110 obtains the available current value at the charging pile end of the fast charging pile in real time, and sends the available current value at the charging pile end and the current chargeable current value of the power battery to the vehicle main control module 130.

[0027] The on-board charging module 120 is used to monitor the current temperature value of the fast charging relay in real time, determine the first relay load current value and relay duration corresponding to the current temperature value from the relay test data table, and send the current temperature value, the first relay load current value and the relay duration to the vehicle main control module 130.

[0028] Here, the relay test data table refers to the data obtained from testing relays at different temperatures. Specifically, the relay test data table includes multiple test temperature values, each corresponding to a test current value and a test duration. The first relay load current value refers to the maximum current that the fast-charging relay can accept at the current temperature value, as characterized in the relay test data table; that is, the maximum capacity of the fast-charging relay at the current temperature value. The relay duration refers to the duration for which the fast-charging relay remains conducting at the current temperature value, as characterized in the relay test data table.

[0029] Here, the on-board charging module 120 refers to the OBS (On-Board Charger) in an electric vehicle. In specific implementation, the on-board charging module 120 monitors the current temperature value of the fast charging relay in the electric vehicle in real time, and determines the first relay load current value and relay duration corresponding to the current temperature value from a pre-set relay test data table, and sends the current temperature value, first relay load current value, and relay duration of the fast charging relay to the vehicle main control module 130.

[0030] The vehicle main control module 130 is used to send a first charging command to the battery management module when it is determined that the fast charging relay has reached a preset state based on the available current value at the charging pile end, the current rechargeable current value, the current temperature value, the load current value of the first relay, and the relay duration. This command drives the on-board charging module to charge the power battery according to the current rechargeable current value, and drives the cooling device to cool the fast charging relay so that the current temperature value of the fast charging relay is lower than a first temperature threshold.

[0031] Here, the vehicle main control module 130 refers to the MDC (Multi-Domain Controller) in an electric vehicle. In specific implementation, after receiving the available current value at the charging pile terminal, the current rechargeable current value of the power battery, the current temperature value of the fast charging relay, the load current value of the first relay, and the relay duration from the fast charging pile, the vehicle main control module 130 determines whether the fast charging relay has reached a preset state based on the above data. When it is determined that the fast charging relay has reached the preset state, the vehicle main control module 130 sends a first charging command to the battery management module 110, so that the battery management module 110 drives the on-board charging module 120 to charge the power battery according to the current rechargeable current value of the power battery. Here, the on-board charging module 120 converts the AC power output from the fast charging pile into high-voltage DC power to charge the power battery. At this time, the vehicle main control module 130 drives the cooling device to cool down the fast charging relay so that the current temperature value of the fast charging relay is lower than a first temperature threshold. Specifically, the first temperature threshold can be 130 degrees Celsius, which is not specifically limited in this application. In this way, by cooling the fast charging relay under high-power charging scenarios, the temperature of the fast charging relay is kept below the first temperature threshold and within the temperature range required for its lifespan. This can delay the performance of the fast charging relay and prevent abnormal fast charging stop caused by the fast charging relay automatically disconnecting due to overheating. This improves the fast charging efficiency of electric vehicles and also enhances the user experience.

[0032] Specifically, according to the embodiments provided in this application, the cooling device consists of a water pump and a fan connected to the cooling water channel in the on-board charging module, and the fast charging relay is located next to the cooling water channel inside the on-board charging module 120. In this way, the water pump and fan inside the on-board charging module 120 can cool the fast charging relay.

[0033] Please see Figure 2 , Figure 2 This is a second schematic diagram of the structure of an intelligent protection system for a fast-charging relay provided in an embodiment of this application. Figure 2 As shown, the on-board charging module 120 includes a temperature sensor 121, which is connected to the fast charging relay.

[0034] The temperature sensor 121 is used to detect the current temperature value of the fast charging relay in real time and send the current temperature value to the vehicle main control module 130.

[0035] Here, with the fast charging relay located within the on-board charging module 120, a temperature sensor 121 is also installed within the on-board charging module 120. The temperature sensor 121 is mainly used to monitor the temperature value of the fast charging relay. The temperature sensor 121 is positioned between the two terminals of the fast charging relay, as close as possible to the heat-generating area of ​​the fast charging relay.

[0036] In this specific implementation, the temperature sensor 121 detects the current temperature value of the fast charging relay in real time and sends the current temperature value of the fast charging relay to the vehicle main control module 130.

[0037] As an optional embodiment, the vehicle main control module 130 is further configured to determine whether the fast charging relay has reached a preset state through the following steps: A: Obtain the current state of charge data of the power battery, and determine the remaining time for the power battery to complete charging based on the current state of charge data and the available current value at the charging pile end.

[0038] Here, the state of charge (SOC) data refers to the SOC data of an electric vehicle, which represents the ratio of the remaining capacity of the electric vehicle's power battery after a period of use or long-term disuse to its capacity when fully charged.

[0039] Regarding step A above, in specific implementation, the vehicle main control module 130 acquires the current state of charge (SOC) data of the power battery and determines the remaining time for the power battery to complete charging based on the current SOC data and the available current value at the fast charging pile terminal. The method for calculating the remaining charging time based on the SOC data of the power battery and the available current value at the fast charging pile terminal is detailed in existing technology and will not be repeated here.

[0040] B: When it is determined that the load current value of the first relay is greater than the smaller value between the available current value at the pile end and the current chargeable current value, and the duration of the relay is greater than or equal to the remaining time, and the current temperature value is less than the first temperature threshold, then the fast charging relay is considered to have reached the preset state.

[0041] Regarding step B above, in specific implementation, the vehicle main control module 130 determines the smaller value between the available current value at the charging pile end and the current chargeable current value. When the vehicle main control module 130 determines that the load current value of the first relay is greater than the smaller value, the relay duration is greater than or equal to the remaining time, and the current temperature value is less than the first temperature threshold, it is considered that the fast charging relay has reached the preset state.

[0042] As an optional embodiment, according to the intelligent protection system 10 provided in this application, when the vehicle main control module 130 determines that the fast charging relay has not reached a preset state, the vehicle main control module 130 is further configured to: I: When it is determined that the current temperature value is less than the first temperature threshold and greater than the second temperature threshold, and the duration of the relay is less than the remaining time, the cooling device is driven to cool down the fast charging relay.

[0043] II: The current temperature value of the fast charging relay is obtained from the vehicle charging module in real time. When the current temperature value is determined to be less than or equal to the second temperature threshold, the second relay load current value corresponding to the second temperature threshold is determined from the relay experimental data table.

[0044] III: Determine a first minimum current value from the second relay load current value, the available current value at the pile end, and the current rechargeable current value, and send a second charging command to the battery management module to drive the on-board charging module to charge the power battery according to the first minimum current value.

[0045] Here, the second temperature threshold can be set to 85 degrees, and this application does not make specific limitations on it.

[0046] Regarding steps I-III above, in specific implementation, when the vehicle main control module 130 determines that the current temperature value of the fast charging relay is less than the first temperature threshold and greater than the second temperature threshold, and the relay duration is less than the remaining time for the power battery to complete charging, it drives the cooling device to cool the fast charging relay. The vehicle main control module 130 obtains the current temperature value of the fast charging relay from the on-board charging module 120 in real time and compares the current temperature value of the fast charging relay with the second temperature threshold. When the vehicle main control module 130 determines that the current temperature value of the fast charging relay is less than or equal to the second temperature threshold, it determines the second relay load current value corresponding to the second temperature threshold from a pre-set relay experimental data table. The vehicle main control module 130 determines the first minimum current value from the second relay load current value, the available current value at the charging pile, and the current rechargeable current value, and sends a second charging command to the battery management module 110, so that the battery management module 110 drives the on-board charging module 120 to charge the power battery according to the first minimum current value.

[0047] As an optional embodiment, according to the intelligent protection system 10 provided in this application, when the vehicle main control module 130 determines that the fast charging relay has not reached a preset state, the vehicle main control module 130 is further configured to: i: When it is determined that the current temperature value is greater than the first temperature threshold and the relay duration is greater than the remaining time, the cooling device is driven to cool down the fast charging relay.

[0048] ii: The current temperature value of the fast charging relay is obtained from the vehicle charging module in real time. When the current temperature value is determined to be less than or equal to the first temperature threshold, the load current value of the third relay corresponding to the first temperature threshold is determined from the relay experimental data table.

[0049] iii: Determine a second minimum current value from the load current value of the third relay, the available current value at the pile end, and the current rechargeable current value, and send a third charging command to the battery management module to drive the on-board charging module to charge the power battery according to the second minimum current value.

[0050] Regarding steps i-iii above, in specific implementation, when the vehicle main control module 130 determines that the current temperature value of the fast charging relay is greater than the first temperature threshold, and the relay duration is greater than the remaining time for the power battery to complete charging, it drives the cooling device to cool the fast charging relay. The vehicle main control module 130 obtains the current temperature value of the fast charging relay from the on-board charging module 120 in real time and compares the current temperature value of the fast charging relay with the first temperature threshold. When the vehicle main control module 130 determines that the current temperature value of the fast charging relay is less than or equal to the first temperature threshold, it determines the third relay load current value corresponding to the first temperature threshold from a pre-set relay experimental data table. The vehicle main control module 130 determines the second minimum current value from the third relay load current value, the available current value at the charging pile, and the current rechargeable current value, and sends a third charging command to the battery management module 110, so that the battery management module 110 drives the on-board charging module 120 to charge the power battery according to the second minimum current value.

[0051] The intelligent protection system for fast charging relays provided in this application includes a battery management module, an on-board charging module, and a vehicle main control module. The battery management module obtains the available current value at the charging pile in real time and sends the available current value at the charging pile and the current rechargeable current value of the power battery to the vehicle main control module. The on-board charging module monitors the current temperature value of the fast charging relay in real time, determines the first relay load current value and relay duration corresponding to the current temperature value from the relay experimental data table, and sends the current temperature value, the first relay load current value, and the relay duration to the vehicle main control module. When the vehicle main control module determines that the fast charging relay has reached a preset state based on the available current value at the charging pile, the current rechargeable current value, the current temperature value, the first relay load current value, and the relay duration, it sends a first charging command to the battery management module to drive the on-board charging module to charge the power battery according to the current rechargeable current value, and drives the cooling device to cool the fast charging relay so that the current temperature value of the fast charging relay is lower than a first temperature threshold.

[0052] This application adds a temperature monitoring and cooling device for the fast-charging relay of electric vehicles. The onboard charging module monitors the temperature of the fast-charging relay in real time, and the cooling device lowers its temperature. In high-power charging scenarios, this ensures the relay's temperature remains below a first temperature threshold, within its lifespan requirement, allowing it to operate at its maximum capacity. This delays the relay's performance and prevents abnormal fast-charging stoppage caused by overheating, improving fast-charging efficiency and enhancing the user experience.

[0053] Please see Figure 3 , Figure 3 This is a flowchart illustrating an intelligent protection method for a fast-charging relay provided in an embodiment of this application. The intelligent protection method is applied to an intelligent protection system for a fast-charging relay, the intelligent protection system including a battery management module, an on-board charging module, and a vehicle main control module. Figure 3 As shown, the intelligent protection method includes: S301, control the battery management module to obtain the available current value at the charging pile end of the fast charging pile in real time, and send the available current value at the charging pile end and the current chargeable current value of the power battery to the vehicle main control module. S302, control the on-board charging module to monitor the current temperature value of the fast charging relay in real time, determine the first relay load current value and relay duration corresponding to the current temperature value from the relay test data table, and send the current temperature value, the first relay load current value and the relay duration to the vehicle main control module; S302, when the vehicle main control module determines that the fast charging relay has reached a preset state based on the available current value at the charging pile end, the current rechargeable current value, the current temperature value, the load current value of the first relay, and the relay duration, it sends a first charging command to the battery management module to drive the on-board charging module to charge the power battery according to the current rechargeable current value, and drives the cooling device to cool the fast charging relay so that the current temperature value of the fast charging relay is lower than the first temperature threshold.

[0054] Furthermore, the cooling device is a water pump and a fan connected to the cooling water channel in the on-board charging module, and the fast charging relay is located next to the cooling water channel in the on-board charging module.

[0055] Furthermore, the on-board charging module includes a temperature sensor, which is connected to the fast charging relay; The temperature sensor is used to detect the current temperature value of the fast charging relay in real time and send the current temperature value to the vehicle main control module.

[0056] Furthermore, the vehicle main control module determines whether the fast charging relay has reached a preset state through the following steps: The current state of charge data of the power battery is obtained, and the remaining time for the power battery to complete charging is determined based on the current state of charge data and the available current value at the charging pile end. When it is determined that the load current value of the first relay is greater than the smaller value between the available current value at the pile end and the current chargeable current value, and the relay duration is greater than or equal to the remaining time, and the current temperature value is less than the first temperature threshold, then the fast charging relay is considered to have reached a preset state.

[0057] Furthermore, when the vehicle main control module determines that the fast charging relay has not reached a preset state, the intelligent protection method further includes: When the vehicle main control module determines that the current temperature value is less than the first temperature threshold and greater than the second temperature threshold, and the relay duration is less than the remaining time, it controls the vehicle main control module to drive the cooling device to cool down the fast charging relay. The vehicle main control module is controlled to obtain the current temperature value of the fast charging relay from the on-board charging module in real time. When it is determined that the current temperature value is less than or equal to the second temperature threshold, the second relay load current value corresponding to the second temperature threshold is determined from the relay experimental data table. The vehicle main control module determines a first minimum current value from the second relay load current value, the available current value at the charging pile end, and the current rechargeable current value, and sends a second charging command to the battery management module to drive the on-board charging module to charge the power battery according to the first minimum current value.

[0058] Furthermore, when the vehicle main control module determines that the fast charging relay has not reached a preset state, the intelligent protection method further includes: When the vehicle main control module determines that the current temperature value is greater than the first temperature threshold and the relay duration is greater than the remaining time, the vehicle main control module controls the cooling device to cool down the fast charging relay. The vehicle main control module is controlled to obtain the current temperature value of the fast charging relay from the on-board charging module in real time. When it is determined that the current temperature value is less than or equal to the first temperature threshold, the load current value of the third relay corresponding to the first temperature threshold is determined from the relay experimental data table. The vehicle main control module determines a second minimum current value from the load current value of the third relay, the available current value at the charging pile, and the current rechargeable current value, and sends a third charging command to the battery management module to drive the on-board charging module to charge the power battery according to the second minimum current value.

[0059] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 4 As shown, the electronic device 400 includes a processor 410, a memory 420, and a bus 430.

[0060] The memory 420 stores machine-readable instructions executable by the processor 410. When the electronic device 400 is running, the processor 410 communicates with the memory 420 via the bus 430. When the machine-readable instructions are executed by the processor 410, they can perform the operations described above. Figure 3 The steps of the smart protection method for the fast-charging relay in the method embodiment shown are described in detail in the method embodiment, and will not be repeated here.

[0061] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, can perform the above-described actions. Figure 3 The steps of the smart protection method for the fast-charging relay in the method embodiment shown are described in detail in the method embodiment, and will not be repeated here.

[0062] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0063] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0064] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0065] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0066] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0067] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An intelligent protection system for a fast-charging relay, characterized in that, The intelligent protection system includes a battery management module, an on-board charging module, and a vehicle main control module; The battery management module is used to obtain the available current value at the charging pile end of the fast charging pile in real time, and send the available current value at the charging pile end and the current chargeable current value of the power battery to the vehicle main control module. The on-board charging module is used to monitor the current temperature value of the fast charging relay in real time, determine the first relay load current value and relay duration corresponding to the current temperature value from the relay test data table, and send the current temperature value, the first relay load current value, and the relay duration to the vehicle main control module; wherein, the first relay load current value refers to the maximum current that the fast charging relay can accept at the current temperature value, as characterized in the relay test data table, that is, the maximum capacity of the fast charging relay at the current temperature value; the relay duration refers to the duration for which the fast charging relay remains conductive at the current temperature value, as characterized in the relay test data table. The vehicle main control module is used to send a first charging command to the battery management module when it is determined that the fast charging relay has reached a preset state based on the available current value at the charging pile, the current chargeable current value, the current temperature value, the load current value of the first relay, and the relay duration. This command drives the on-board charging module to charge the power battery according to the current chargeable current value, and drives the cooling device to cool the fast charging relay so that the current temperature value of the fast charging relay is lower than a first temperature threshold. The vehicle main control module is also used to determine whether the fast charging relay has reached a preset state through the following steps: The current state of charge data of the power battery is obtained, and the remaining time for the power battery to complete charging is determined based on the current state of charge data and the available current value at the charging pile end. When it is determined that the load current value of the first relay is greater than the smaller value between the available current value at the pile end and the current chargeable current value, and the relay duration is greater than or equal to the remaining time, and the current temperature value is less than the first temperature threshold, then the fast charging relay is considered to have reached a preset state.

2. The intelligent protection system according to claim 1, characterized in that, The cooling device is a water pump and a fan connected to the cooling water channel in the on-board charging module, and the fast charging relay is located next to the cooling water channel in the on-board charging module.

3. The intelligent protection system according to claim 2, characterized in that, The on-board charging module includes a temperature sensor, which is connected to the fast charging relay. The temperature sensor is used to detect the current temperature value of the fast charging relay in real time and send the current temperature value to the vehicle main control module.

4. The intelligent protection system according to claim 3, characterized in that, When the vehicle main control module determines that the fast charging relay has not reached a preset state, the vehicle main control module is also used to: When it is determined that the current temperature value is less than the first temperature threshold and greater than the second temperature threshold, and the duration of the relay is less than the remaining time, the cooling device is driven to cool down the fast charging relay. The current temperature value of the fast charging relay is obtained from the vehicle charging module in real time. When it is determined that the current temperature value is less than or equal to the second temperature threshold, the second relay load current value corresponding to the second temperature threshold is determined from the relay experimental data table. A first minimum current value is determined from the second relay load current value, the available current value at the pile end, and the current rechargeable current value, and a second charging command is sent to the battery management module to drive the on-board charging module to charge the power battery according to the first minimum current value.

5. The intelligent protection system according to claim 3, characterized in that, When the vehicle main control module determines that the fast charging relay has not reached a preset state, the vehicle main control module is also used to: When it is determined that the current temperature value is greater than the first temperature threshold and the relay duration is greater than the remaining time, the cooling device is driven to cool down the fast charging relay. The current temperature value of the fast charging relay is obtained from the vehicle charging module in real time. When it is determined that the current temperature value is less than or equal to the first temperature threshold, the load current value of the third relay corresponding to the first temperature threshold is determined from the relay experimental data table. The second minimum current value is determined from the load current value of the third relay, the available current value at the pile end, and the current rechargeable current value, and a third charging command is sent to the battery management module to drive the on-board charging module to charge the power battery according to the second minimum current value.

6. A smart protection method for a fast-charging relay, characterized in that, The intelligent protection method is applied to the intelligent protection system of the fast charging relay as described in any one of claims 1-5, wherein the intelligent protection system includes a battery management module, an on-board charging module, and a vehicle main control module; the intelligent protection method includes: The battery management module is controlled to obtain the available current value at the charging pile in real time from the fast charging pile, and send the available current value at the charging pile and the current chargeable current value of the power battery to the vehicle main control module. The vehicle charging module monitors the current temperature of the fast charging relay in real time, determines the first relay load current value and relay duration corresponding to the current temperature value from the relay test data table, and sends the current temperature value, the first relay load current value, and the relay duration to the vehicle main control module. The first relay load current value refers to the maximum current that the fast charging relay can accept at the current temperature value, as characterized in the relay test data table; the relay duration refers to the duration for which the fast charging relay remains conductive at the current temperature value, as characterized in the relay test data table. When the main control module of the vehicle determines that the fast charging relay has reached a preset state based on the available current value at the charging pile, the current chargeable current value, the current temperature value, the load current value of the first relay, and the relay duration, it sends a first charging command to the battery management module to drive the on-board charging module to charge the power battery according to the current chargeable current value, and drives the cooling device to cool down the fast charging relay so that the current temperature value of the fast charging relay is lower than the first temperature threshold. The vehicle main control module determines whether the fast charging relay has reached a preset state through the following steps: The current state of charge data of the power battery is obtained, and the remaining time for the power battery to complete charging is determined based on the current state of charge data and the available current value at the charging pile end. When it is determined that the load current value of the first relay is greater than the smaller value between the available current value at the pile end and the current chargeable current value, and the relay duration is greater than or equal to the remaining time, and the current temperature value is less than the first temperature threshold, then the fast charging relay is considered to have reached a preset state.

7. The intelligent protection method according to claim 6, characterized in that, The cooling device is a water pump and a fan connected to the cooling water channel in the on-board charging module, and the fast charging relay is located next to the cooling water channel in the on-board charging module.

8. An electronic device, characterized in that, include: The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. The machine-readable instructions are executed by the processor to perform the steps of the smart protection method for the fast-charging relay as described in any one of claims 6 to 7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, performs the steps of the intelligent protection method for the fast-charging relay as described in any one of claims 6 to 7.

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