Test methods, apparatus, equipment and storage media for the heat preservation function of electric vehicle plugs

Abstract

This invention discloses a method, apparatus, device, and storage medium for testing the charging gun insulation function of an electric vehicle. The method involves immersing the electric vehicle in a predetermined low-temperature environment and charging it to a preset SOC range, causing the temperature of the electric vehicle's power battery to drop below a predetermined low-temperature threshold. While maintaining a physical connection between the charging gun and the electric vehicle, the method monitors the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery. When the battery temperature drops to the predetermined low-temperature threshold, the charging gun insulation function is triggered, and key parameters during the function's operation are recorded. Based on the changes in key parameters and the SOC value, the energy source of the charging gun insulation function is determined. This comprehensively verifies the reliability of the function's triggering conditions, temperature control performance, and exit logic, ensuring the normal operation of the electric vehicle's battery thermal management function in low-temperature environments and improving the safety and user experience in cold climates.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle battery thermal management technology, and in particular to a method, apparatus, equipment and storage medium for testing the heat preservation function of electric vehicle battery charging guns. Background Technology

[0002] With the increasing popularity of electric vehicles, the performance degradation of power batteries in low-temperature environments has become a growing concern. The plug-in insulation function is an effective solution whose value lies in using the power of the charging pile, rather than the vehicle battery, to heat or maintain the temperature of the vehicle battery system after the vehicle is fully charged. This ensures that the battery can maintain its optimal operating temperature range in low-temperature environments, thereby improving the vehicle's low-temperature start-up performance and the user experience.

[0003] Currently, there is a lack of standardized testing methods to comprehensively verify the reliability, energy efficiency, and boundary conditions of this function.

[0004] Currently, there is no unified and standardized method in the industry for testing the heat preservation function of the heat gun; the existing testing methods are rather fragmented, but can be summarized as follows according to the testing purpose and scheme: Function trigger verification: The common practice is to charge the vehicle to full, leave it in a low-temperature environment while keeping the charging gun connected, and measure the surface temperature of the battery pack using a non-contact temperature measuring device (such as a temperature gun), or rely on the vehicle's own status prompts (such as the central control screen displaying "Battery is keeping warm") to indirectly determine whether the function has been activated.

[0005] Energy source determination: The energy source can be indirectly inferred by observing whether the State of Charge (SOC) of the power battery on the vehicle's instrument cluster is stable during the heat preservation period, or by installing a power meter at the charging station to observe whether there is a small power output. If the SOC drops significantly, it is inferred that the heating energy comes from the vehicle battery. If the charging station has a small power output, it is inferred that the heating energy comes from the charging station.

[0006] Control logic verification: Set different initial conditions (such as different ambient temperatures and SOC values) to observe under what conditions the function will be triggered, and whether it will stop correctly after the battery temperature reaches the preset target or the heating time reaches the upper limit; this is usually determined with the help of the vehicle's built-in sensors and simple diagnostic tools.

[0007] Although existing testing methods can provide preliminary verification of the heat preservation function of the gun, they have the following shortcomings in terms of rigor, comprehensiveness, and standardization: (1) The source of energy is unclear and lacks direct evidence. Existing methods cannot accurately verify whether the heating energy comes 100% from the charging station; methods that indirectly observe the SOC or the power at the charging station are affected by factors such as measurement accuracy and vehicle static power consumption, and cannot provide conclusive evidence. This may lead to misjudging abnormal battery power consumption as normal.

[0008] (2) The testing process was not standardized and failed to simulate real-world scenarios. The existing testing procedures are rather arbitrary and lack standards; for example, the test results differ significantly between the test sequence of "charging first and then immersing the vehicle at low temperature" and the sequence of "immersing the vehicle at low temperature first, then charging, and finally observing it while connected to the charging gun"; the existing methods for functional verification have not been clearly defined.

[0009] (3) The test dimensions are too limited and lack a systematic evaluation system. Existing methods focus primarily on the effectiveness of functions, lacking a multi-dimensional and systematic comprehensive evaluation system. They also lack systematic test design and evaluation standards for dimensions such as the precise control logic of functions (e.g., trigger / exit conditions), compatibility with different types of charging piles (DC / AC), stability and reliability under boundary conditions such as extreme low temperatures or battery SOC critical points, and energy consumption efficiency during long-term operation. Summary of the Invention

[0010] The main objective of this invention is to provide a method, apparatus, equipment, and storage medium for testing the heat preservation function of electric vehicle plugs, aiming to solve the technical problems in the prior art, such as ambiguity in determining the energy source of the heat preservation function test, lack of direct evidence, non-standardized testing process, failure to simulate real-world scenarios, single testing dimensions, and lack of a systematic evaluation system.

[0011] In a first aspect, the present invention provides a method for testing the heat preservation function of an electric vehicle plug nozzle, the method comprising the following steps: The electric vehicle is immersed in a predetermined low-temperature environment and charged to a predetermined SOC range, so that the temperature of the electric vehicle's power battery drops below a predetermined low-temperature threshold. While maintaining the physical connection between the charging gun and the electric vehicle, the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery are monitored. When the battery temperature drops to the predetermined low temperature threshold, the charging gun insulation function is triggered and key parameters during the operation of the function are recorded. The energy source for the heat preservation function of the gun is determined based on the changes in the key parameters and the SOC value.

[0012] Optionally, the step of placing the electric vehicle in a predetermined low-temperature environment for immersion treatment and charging it to a preset SOC range, so that the temperature of the electric vehicle's power battery drops below a predetermined low-temperature threshold, includes: The electric vehicle is moved into the environmental simulation chamber, and the temperature regulation system of the environmental simulation chamber is controlled to reduce the temperature inside the chamber to a preset low temperature range at a preset cooling rate. The electric vehicle is kept in a locked state and immersed in water. The electric vehicle is charged to a preset SOC range, and the temperature of the electric vehicle's power battery is reduced to below a predetermined low temperature threshold.

[0013] Optionally, the step of keeping the electric vehicle in a locked state during immersion treatment, charging the electric vehicle to a preset SOC range, and reducing the temperature of the electric vehicle's power battery to below a predetermined low-temperature threshold includes: The electric vehicle is kept in a locked state for immersion treatment to ensure uniform temperature distribution of all components. After the immersion treatment reaches the predetermined immersion time, a standard charging device is connected to charge the electric vehicle until the state of charge of the electric vehicle's power battery reaches the preset SOC range. Continuously monitor the temperature data at each temperature measurement point of the power battery to confirm that the power battery temperature drops below the predetermined low temperature threshold.

[0014] Optionally, while maintaining the physical connection between the charging gun and the electric vehicle, the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery are monitored. When the battery temperature drops to the predetermined low-temperature threshold, the charging gun insulation function is triggered, and key parameters during the function's operation are recorded, including: While the charging gun remains physically connected to the charging interface of the electric vehicle and no charging current is transmitted, monitor the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery. When the average or minimum temperature of the key temperature measurement points of the power battery reaches the preset low temperature threshold, the electric vehicle's plug-in insulation function is automatically triggered, and key parameters during the function operation are recorded synchronously.

[0015] Optionally, monitoring the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery while the charging gun remains physically connected to the charging interface of the electric vehicle and no charging current is transmitted includes: With the charging gun physically connected to the charging interface of the electric vehicle and no charging current being transmitted, the temperature changes at key locations within the power battery are collected in real time through a distributed temperature sensor network. At the same time, the output parameters of the charging equipment and the SOC value of the power battery are obtained using the current and voltage monitoring module built into the charging equipment and the vehicle BMS system.

[0016] Optionally, determining the energy source for the heat preservation function of the plug-in gun based on changes in the key parameters and the SOC value includes: The output current / power data of the charging device is extracted from the key parameters. Based on the output current / power data and the change data of the SOC value, combined with the vehicle static standby power consumption model, the theoretical power consumption reduction corresponding to the theoretical standby power consumption of the whole vehicle during the operation of the plug-in heat preservation function is calculated. The energy source of the plug-in heat preservation function is determined by quantitatively comparing the actual measured change in the power battery charge among the key parameters with the theoretical decrease in charge charge.

[0017] Optionally, the step of quantitatively comparing the actual measured change in the power battery's charge level with the theoretical decrease in charge level among the key parameters to determine the energy source of the plug-in insulation function includes: The actual measured change in the power battery's charge level among the key parameters is quantitatively compared with the theoretical decrease in charge level. When the actual change in the amount of electricity matches the theoretical decrease in the amount of electricity, and the charging device continuously outputs current / power, it is determined that the energy for the plug-in heat preservation function comes from the external charging device. When the difference between the actual change in power and the theoretical decrease in power is greater than the change in power corresponding to the output energy of the charging device, it is determined that the energy of the plug-in heat preservation function comes from the power battery's own power. Cross-validation is performed by calling the PTC heater operating status data and temperature change curve from the key parameters. If the temperature rises and the power decreases match the difference in output energy of the charging device, it is determined that the energy of the plug-in heat preservation function comes from the self-discharge of the power battery.

[0018] Secondly, to achieve the above objectives, the present invention also proposes an electric vehicle plug-in insulation function testing device, the electric vehicle plug-in insulation function testing device comprising: The vehicle immersion charging module is used to place an electric vehicle in a predetermined low-temperature environment for immersion treatment and charge it to a predetermined SOC range, so that the temperature of the electric vehicle's power battery drops below a predetermined low-temperature threshold. The monitoring and recording module is used to monitor the temperature change of the power battery, the output parameters of the charging equipment and the SOC value of the power battery while maintaining the physical connection between the charging gun and the electric vehicle. When the battery temperature drops to the predetermined low temperature threshold, the charging gun insulation function is triggered and key parameters during the operation of the function are recorded. The energy source determination module is used to determine the energy source of the gun heat preservation function based on the changes in the key parameters and the SOC value.

[0019] Thirdly, to achieve the above objectives, the present invention also proposes an electric vehicle plug-in insulation function testing device, which includes: a memory, a processor, and an electric vehicle plug-in insulation function testing program stored in the memory and executable on the processor. The electric vehicle plug-in insulation function testing program is configured to implement the steps of the electric vehicle plug-in insulation function testing method described above.

[0020] Fourthly, to achieve the above objectives, the present invention also proposes a storage medium storing a test program for the heat preservation function of an electric vehicle plug, wherein when the test program is executed by a processor, it implements the steps of the test method for the heat preservation function of an electric vehicle plug as described above.

[0021] The electric vehicle charging gun insulation function test method proposed in this invention involves immersing the electric vehicle in a predetermined low-temperature environment and charging it to a preset SOC range, causing the temperature of the electric vehicle's power battery to drop below a predetermined low-temperature threshold. While maintaining a physical connection between the charging gun and the electric vehicle, the method monitors the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery. When the battery temperature drops to the predetermined low-temperature threshold, the charging gun insulation function is triggered, and key parameters during the function's operation are recorded. Based on the changes in these key parameters and the SOC value, the method determines the energy source of the charging gun insulation function. Through systematic parameter monitoring and analysis, it accurately distinguishes whether the energy during the operation of the charging gun insulation function is provided by an external charging device or by the power battery itself discharging. This comprehensively verifies the reliability of the function triggering conditions, temperature control performance, and exit logic, and promptly identifies abnormal battery discharge problems caused by defects in energy management strategies. This ensures the normal operation of the electric vehicle's battery thermal management function in low-temperature environments, improving safety and user experience in cold climates. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the device structure of the hardware operating environment involved in the embodiments of the present invention; Figure 2 This is a flowchart illustrating the first embodiment of the electric vehicle plug-in insulation function test method of the present invention; Figure 3 This is a flowchart illustrating the second embodiment of the electric vehicle plug heat preservation function test method of the present invention; Figure 4 This is a flowchart illustrating the third embodiment of the electric vehicle plug-in insulation function test method of the present invention; Figure 5 This is a flowchart illustrating the fourth embodiment of the electric vehicle plug insulation function test method of the present invention; Figure 6This is a schematic diagram of the core process in the electric vehicle plug-in insulation function test method of the present invention; Figure 7 This is a functional block diagram of the first embodiment of the electric vehicle plug-in insulation function testing device of the present invention.

[0023] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0025] The solution of this invention mainly involves: immersing the electric vehicle in a predetermined low-temperature environment and charging it to a preset SOC range, thereby lowering the temperature of the electric vehicle's power battery below a predetermined low-temperature threshold; while maintaining a physical connection between the charging gun and the electric vehicle, monitoring the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery; when the battery temperature drops to the predetermined low-temperature threshold, triggering the charging gun insulation function and recording key parameters during the function's operation; determining the energy source of the charging gun insulation function based on the key parameters and changes in the SOC value; through systematic parameter monitoring and analysis, accurately distinguishing whether the energy during the operation of the charging gun insulation function is provided by an external charging device or discharged by the power battery itself; comprehensively verifying the reliability of the function triggering conditions, temperature control performance, and exit logic; promptly identifying abnormal battery discharge problems caused by defects in energy management strategies; ensuring the normal operation of the electric vehicle's battery thermal management function in low-temperature environments; improving the safety and user experience under cold climate conditions; and solving the technical problems in the prior art where the energy source determination for the charging gun insulation function is ambiguous, lacks direct evidence, the testing process is non-standardized, fails to simulate real-world scenarios, has a single testing dimension, and lacks a systematic evaluation system.

[0026] Reference Figure 1 , Figure 1 This is a schematic diagram of the device structure of the hardware operating environment involved in the embodiments of the present invention.

[0027] like Figure 1As shown, the device may include: a processor 1001, such as a CPU; a communication bus 1002; a user interface 1003; a network interface 1004; and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be high-speed RAM or non-volatile memory, such as a disk drive. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0028] Those skilled in the art will understand that Figure 1 The device structure shown does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0029] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating device, a network communication module, a user interface module, and a test program for the heat preservation function of electric vehicle plug guns.

[0030] The device of this invention calls the electric vehicle plug-in heat preservation function test program stored in the memory 1005 through the processor 1001, and performs the following operations: The electric vehicle is immersed in a predetermined low-temperature environment and charged to a predetermined SOC range, so that the temperature of the electric vehicle's power battery drops below a predetermined low-temperature threshold. While maintaining the physical connection between the charging gun and the electric vehicle, the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery are monitored. When the battery temperature drops to the predetermined low temperature threshold, the charging gun insulation function is triggered and key parameters during the operation of the function are recorded. The energy source for the heat preservation function of the gun is determined based on the changes in the key parameters and the SOC value.

[0031] The device of the present invention, through processor 1001 calling the electric vehicle plug-in heat preservation function test program stored in memory 1005, also performs the following operations: The electric vehicle is moved into the environmental simulation chamber, and the temperature regulation system of the environmental simulation chamber is controlled to reduce the temperature inside the chamber to a preset low temperature range at a preset cooling rate. The electric vehicle is kept in a locked state and immersed in water. The electric vehicle is charged to a preset SOC range, and the temperature of the electric vehicle's power battery is reduced to below a predetermined low temperature threshold.

[0032] The device of the present invention, through processor 1001 calling the electric vehicle plug-in heat preservation function test program stored in memory 1005, also performs the following operations: The electric vehicle is kept in a locked state for immersion treatment to ensure uniform temperature distribution of all components. After the immersion treatment reaches the predetermined immersion time, a standard charging device is connected to charge the electric vehicle until the state of charge of the electric vehicle's power battery reaches the preset SOC range. Continuously monitor the temperature data at each temperature measurement point of the power battery to confirm that the power battery temperature drops below the predetermined low temperature threshold.

[0033] The device of the present invention, through processor 1001 calling the electric vehicle plug-in heat preservation function test program stored in memory 1005, also performs the following operations: While the charging gun remains physically connected to the charging interface of the electric vehicle and no charging current is transmitted, monitor the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery. When the average or minimum temperature of the key temperature measurement points of the power battery reaches the preset low temperature threshold, the electric vehicle's plug-in insulation function is automatically triggered, and key parameters during the function operation are recorded synchronously.

[0034] The device of the present invention, through processor 1001 calling the electric vehicle plug-in heat preservation function test program stored in memory 1005, also performs the following operations: With the charging gun physically connected to the charging interface of the electric vehicle and no charging current being transmitted, the temperature changes at key locations within the power battery are collected in real time through a distributed temperature sensor network. At the same time, the output parameters of the charging equipment and the SOC value of the power battery are obtained using the current and voltage monitoring module built into the charging equipment and the vehicle BMS system.

[0035] The device of the present invention, through processor 1001 calling the electric vehicle plug-in heat preservation function test program stored in memory 1005, also performs the following operations: The output current / power data of the charging device is extracted from the key parameters. Based on the output current / power data and the change data of the SOC value, combined with the vehicle static standby power consumption model, the theoretical power consumption reduction corresponding to the theoretical standby power consumption of the whole vehicle during the operation of the plug-in heat preservation function is calculated. The energy source of the plug-in heat preservation function is determined by quantitatively comparing the actual measured change in the power battery charge among the key parameters with the theoretical decrease in charge charge.

[0036] The device of the present invention, through processor 1001 calling the electric vehicle plug-in heat preservation function test program stored in memory 1005, also performs the following operations: The actual measured change in the power battery's charge level among the key parameters is quantitatively compared with the theoretical decrease in charge level. When the actual change in the amount of electricity matches the theoretical decrease in the amount of electricity, and the charging device continuously outputs current / power, it is determined that the energy for the plug-in heat preservation function comes from the external charging device. When the difference between the actual change in power and the theoretical decrease in power is greater than the change in power corresponding to the output energy of the charging device, it is determined that the energy of the plug-in heat preservation function comes from the power battery's own power. Cross-validation is performed by calling the PTC heater operating status data and temperature change curve from the key parameters. If the temperature rises and the power decreases match the difference in output energy of the charging device, it is determined that the energy of the plug-in heat preservation function comes from the self-discharge of the power battery.

[0037] This embodiment, through the above-described scheme, immerses the electric vehicle in a predetermined low-temperature environment and charges it to a preset SOC range, causing the temperature of the electric vehicle's power battery to drop below a predetermined low-temperature threshold. While maintaining a physical connection between the charging gun and the electric vehicle, it monitors the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery. When the battery temperature drops to the predetermined low-temperature threshold, it triggers the charging gun insulation function and records key parameters during operation. Based on the changes in these key parameters and the SOC value, it determines the energy source of the charging gun insulation function. Through systematic parameter monitoring and analysis, it accurately distinguishes whether the energy during the operation of the charging gun insulation function is provided by an external charging device or discharged by the power battery itself. This comprehensively verifies the reliability of the function triggering conditions, temperature control performance, and exit logic, and promptly identifies abnormal battery discharge problems caused by defects in energy management strategies. This ensures the normal operation of the electric vehicle's battery thermal management function in low-temperature environments, improving safety and user experience in cold climates.

[0038] Based on the above hardware structure, an embodiment of the electric vehicle plug-in insulation function test method of the present invention is proposed.

[0039] Reference Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of the electric vehicle plug-in insulation function test method of the present invention.

[0040] In the first embodiment, the electric vehicle plug-in insulation function test method includes the following steps: Step S10: Place the electric vehicle in a predetermined low-temperature environment for immersion treatment and charge it to a preset SOC range, so that the temperature of the electric vehicle's power battery drops below a predetermined low-temperature threshold.

[0041] It should be noted that immersing the electric vehicle in a temperature-controlled low-temperature environment and charging the battery at appropriate times to bring it to a preset state of charge range, ultimately reducing the battery temperature below a pre-set low-temperature critical point, provides the necessary test conditions for subsequent verification of the function's performance in real low-temperature environments.

[0042] Step S20: While maintaining the physical connection between the charging gun and the electric vehicle, monitor the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery. When the battery temperature drops to the predetermined low temperature threshold, trigger the charging gun heat preservation function and record the key parameters during the function operation.

[0043] It should be understood that while the charging gun remains physically connected to the electric vehicle, the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery are monitored in real time. When the battery temperature is detected to drop to a preset low temperature critical value, the charging gun insulation function is activated, and key parameters during the operation of the function are recorded simultaneously.

[0044] Step S30: Determine the energy source of the gun heat preservation function based on the changes in the key parameters and the SOC value.

[0045] Understandably, by analyzing the relationship between key parameters recorded during the operation of the plug-in insulation function and changes in the battery's state of charge (SOC), the energy supply source for the insulation function can be determined.

[0046] This embodiment, through the above-described scheme, immerses the electric vehicle in a predetermined low-temperature environment and charges it to a preset SOC range, causing the temperature of the electric vehicle's power battery to drop below a predetermined low-temperature threshold. While maintaining a physical connection between the charging gun and the electric vehicle, it monitors the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery. When the battery temperature drops to the predetermined low-temperature threshold, it triggers the charging gun insulation function and records key parameters during operation. Based on the changes in these key parameters and the SOC value, it determines the energy source of the charging gun insulation function. Through systematic parameter monitoring and analysis, it accurately distinguishes whether the energy during the operation of the charging gun insulation function is provided by an external charging device or discharged by the power battery itself. This comprehensively verifies the reliability of the function triggering conditions, temperature control performance, and exit logic, and promptly identifies abnormal battery discharge problems caused by defects in energy management strategies. This ensures the normal operation of the electric vehicle's battery thermal management function in low-temperature environments, improving safety and user experience in cold climates.

[0047] Furthermore, Figure 3 This is a flowchart illustrating the second embodiment of the electric vehicle plug insulation function test method of the present invention, as shown below. Figure 3 As shown, based on the first embodiment, a second embodiment of the electric vehicle plug heat preservation function test method of the present invention is proposed. In this embodiment, step S10 specifically includes the following steps: Step S11: Move the electric vehicle into the environmental simulation chamber and control the temperature regulation system of the environmental simulation chamber to reduce the temperature inside the chamber to a preset low temperature range at a preset cooling rate.

[0048] It should be noted that by moving the electric vehicle under test into a professional environmental simulation test chamber, the temperature inside the chamber is gradually reduced to the target low temperature range by precisely controlling the cooling system of the environmental chamber at a set cooling rate (usually 1-2℃ / minute). This can avoid thermal stress damage to the battery structure caused by sudden temperature changes, and ensure that the temperature of the whole vehicle, especially the power battery pack, is uniformly distributed. This creates a stable, controllable and repeatable low temperature test environment for subsequent plug-in insulation function tests.

[0049] Step S12: Keep the electric vehicle in a locked state and perform immersion treatment, charge the electric vehicle to a preset SOC range, and reduce the temperature of the electric vehicle's power battery to below a predetermined low temperature threshold.

[0050] Understandably, in a low-temperature testing environment, keeping the electric vehicle in a locked state (i.e., the vehicle's power system is in a dormant state rather than a completely de-energized state) and performing sufficient temperature equalization treatment (i.e., immersion treatment) and charging the electric vehicle to a preset SOC range will reduce the temperature of the electric vehicle's power battery to below a predetermined low-temperature threshold, creating the required low-temperature and low-power operating conditions for subsequent testing.

[0051] Furthermore, step S12 specifically includes the following steps: The electric vehicle is kept in a locked state for immersion treatment to ensure uniform temperature distribution of all components. After the immersion treatment reaches the predetermined immersion time, a standard charging device is connected to charge the electric vehicle until the state of charge of the electric vehicle's power battery reaches the preset SOC range. Continuously monitor the temperature data at each temperature measurement point of the power battery to confirm that the power battery temperature drops below the predetermined low temperature threshold.

[0052] Understandably, during low-temperature testing, the electric vehicle is kept in a locked state (the vehicle's power system is in sleep mode) to allow for sufficient temperature equalization, ensuring uniform temperature distribution throughout the vehicle, especially among components inside the power battery pack. After a predetermined immersion period, the vehicle is charged using a charging device that meets charging standards, bringing the power battery's state of charge (SOC) to the specific range required for the test. Simultaneously, temperature data is continuously collected by temperature sensors distributed at key locations within the battery pack, monitoring battery temperature changes in real time until it is confirmed that the temperature of the entire power battery system has stabilized and dropped below the preset low-temperature threshold, creating accurate low-temperature test conditions for subsequent plug-in insulation function testing.

[0053] This embodiment, through the above-described scheme, moves an electric vehicle into an environmental simulation chamber, controls the temperature regulation system of the chamber to lower the chamber temperature to a preset low temperature range at a preset cooling rate, keeps the electric vehicle in a locked state for immersion treatment, charges the electric vehicle to a preset SOC range, and lowers the temperature of the electric vehicle's power battery below a predetermined low temperature threshold. Through precisely controlled cooling and sufficient temperature equalization, it ensures that the electric vehicle's power battery reaches a uniform and stable low-temperature test environment under preset state of charge conditions. This provides a reliable foundation for accurately verifying the energy management mechanism of the plug-in insulation function, avoids functional misjudgments caused by uneven temperature distribution or non-standard test conditions, effectively simulates vehicle usage scenarios under real cold climate conditions, and improves the repeatability and engineering application value of test results.

[0054] Furthermore, Figure 4 This is a flowchart illustrating the third embodiment of the electric vehicle plug insulation function test method of the present invention, as shown below. Figure 4 As shown, based on the first embodiment, a third embodiment of the electric vehicle plug insulation function test method of the present invention is proposed. In this embodiment, step S20 specifically includes the following steps: Step S21: While the charging gun remains physically connected to the charging interface of the electric vehicle and no charging current is transmitted, monitor the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery.

[0055] It should be noted that after the electric vehicle completes regular charging, the charging gun remains physically connected to the vehicle's charging interface but has stopped transmitting normal charging current. The vehicle monitoring system and the sensors of the charging equipment collect real-time data on the temperature changes of the power battery pack, the output current / voltage of the charging equipment, and the current state of charge (SOC) of the power battery. The purpose is to monitor and evaluate whether and how external power can be used to provide insulation for the battery when the charging gun is plugged in but not charging.

[0056] Furthermore, step S21 specifically includes the following steps: With the charging gun physically connected to the charging interface of the electric vehicle and no charging current being transmitted, the temperature changes at key locations within the power battery are collected in real time through a distributed temperature sensor network. At the same time, the output parameters of the charging equipment and the SOC value of the power battery are obtained using the current and voltage monitoring module built into the charging equipment and the vehicle BMS system.

[0057] It should be understood that after a regular electric vehicle has completed charging, while the charging gun remains physically connected to the vehicle's charging interface but normal charging current transmission has ceased (i.e., the gun is plugged in but charging is not happening), a distributed temperature sensor network deployed within the battery pack monitors temperature changes in different areas of the battery (such as the module center, edges, and other critical locations) in real time. Simultaneously, the charging equipment's built-in current and voltage monitoring module acquires the charging equipment's output parameters (such as minute insulation current / voltage), and the current state of charge (SOC) value of the power battery is read through the vehicle's Battery Management System (BMS). The purpose is to comprehensively monitor the battery status and environmental parameters before the gun insertion insulation function is activated.

[0058] Step S22: When the average temperature or minimum temperature of the key temperature measurement point of the power battery reaches the preset low temperature threshold, the plug-in heat preservation function of the electric vehicle is automatically triggered. During the operation of the function, the key parameters during the operation of the function are recorded simultaneously.

[0059] Understandably, when the average or minimum temperature of the key temperature measurement points of the power battery reaches the preset low temperature threshold, the plug-in heat preservation function can be automatically activated. During the operation of this function, key parameters during the operation process are recorded simultaneously to ensure that the working status and energy management effect of the plug-in heat preservation function can be fully evaluated.

[0060] This embodiment, through the above-described scheme, monitors the temperature changes of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery while maintaining a physical connection between the charging gun and the charging interface of the electric vehicle and without charging current transmission. When the average or minimum temperature of the key temperature measurement points of the power battery reaches a preset low-temperature threshold, the charging gun insulation function of the electric vehicle is automatically triggered. During the operation of this function, key parameters are recorded synchronously, accurately capturing the triggering timing of the charging gun insulation function and comprehensively recording key data during the operation. By monitoring the correlation between battery temperature changes and the output status of the charging equipment in real time, it effectively verifies whether the charging gun insulation function is activated under the correct temperature conditions, whether it can maintain the battery within a suitable operating temperature range, and whether the energy is reasonably derived from external power rather than consuming the battery's own power. This ensures the reliability and safety of the battery thermal management system of the electric vehicle in low-temperature environments, improving the vehicle's performance and user satisfaction in cold climates.

[0061] Furthermore, Figure 5 This is a flowchart illustrating the fourth embodiment of the electric vehicle plug insulation function test method of the present invention, as shown below. Figure 5 As shown, based on the first embodiment, a fourth embodiment of the electric vehicle plug insulation function test method of the present invention is proposed. In this embodiment, step S30 specifically includes the following steps: Step S31: Extract the output current / power data of the charging device from the key parameters. Based on the output current / power data and the change data of the SOC value, and combined with the vehicle static standby power consumption model, calculate the theoretical decrease in power consumption corresponding to the theoretical standby power consumption of the whole vehicle during the operation of the plug-in heat preservation function.

[0062] It should be noted that, from the key parameters recorded during the operation of the plug-in heat preservation function, the current and power data output by the charging equipment are extracted, and the change data of the state of charge (SOC) of the power battery is obtained. Then, combined with the pre-established mathematical model of vehicle static standby power consumption (which describes the power consumption pattern of various electronic systems in the vehicle in the locked state), the theoretical decrease in SOC caused only by the normal standby power consumption of the vehicle during the operation of the plug-in heat preservation function is obtained through the energy conservation calculation method. This calculation result will be used as a benchmark reference value for subsequent comparison and analysis with the actual SOC change to determine whether there is any additional energy consumption from the power battery's own discharge during the operation of the plug-in heat preservation function.

[0063] Step S32: Quantitatively compare the actual measured change in the power battery charge among the key parameters with the theoretical decrease in charge charge to determine the energy source of the plug-in heat preservation function.

[0064] Understandably, by comparing the change in the state of charge of the power battery actually measured by the battery management system during the operation of the plug-in heat preservation function with the theoretical SOC decrease calculated based on the vehicle's static standby power consumption model, the energy source of the plug-in heat preservation function can be determined.

[0065] Furthermore, step S32 specifically includes the following steps: The actual measured change in the power battery's charge level among the key parameters is quantitatively compared with the theoretical decrease in charge level. When the actual change in the amount of electricity matches the theoretical decrease in the amount of electricity, and the charging device continuously outputs current / power, it is determined that the energy for the plug-in heat preservation function comes from the external charging device. When the difference between the actual change in power and the theoretical decrease in power is greater than the change in power corresponding to the output energy of the charging device, it is determined that the energy of the plug-in heat preservation function comes from the power battery's own power. Cross-validation is performed by calling the PTC heater operating status data and temperature change curve from the key parameters. If the temperature rises and the power decreases match the difference in output energy of the charging device, it is determined that the energy of the plug-in heat preservation function comes from the self-discharge of the power battery.

[0066] It should be understood that by accurately comparing the actual measured change in State of Charge (SOC) of the power battery during the operation of the plug-in heat preservation function with the theoretical SOC decrease calculated based on the vehicle's static standby power consumption model, and combining this with the output status of the charging equipment, a comprehensive judgment is made: when the actual SOC change is basically consistent with the theoretical decrease and the charging equipment is continuously outputting current / power, it indicates that the battery power consumption only comes from the vehicle's normal standby demand, and it is determined that the energy of the plug-in heat preservation function is entirely provided by the external charging equipment; when the difference between the actual SOC decrease and the theoretical decrease exceeds the range that the energy output of the charging equipment can explain, it is determined that there is an anomaly in the system; to further verify the accuracy of the judgment, the data of the positive temperature coefficient (PTC) heater operating status and temperature change curve in the key parameters are cross-analyzed. If it is observed that the battery temperature rises and the difference between the additional SOC decrease and the energy output of the charging equipment is consistent, it is confirmed that part of the energy of the plug-in heat preservation function comes from the power battery's own discharge during operation, thus accurately identifying whether there are defects in the energy management strategy and providing an objective and reliable basis for judging the energy source.

[0067] In the specific implementation, Figure 6 This is a schematic diagram of the core process in the electric vehicle plug insulation function test method of the present invention, as shown below. Figure 6As shown, the test equipment, including an environmental simulation chamber, charging equipment, and a data acquisition system, was prepared first, and the vehicle under test was confirmed to be in normal working condition. Then, the initial SOC value of the vehicle and the temperature at each measuring point of the power battery were recorded as baseline data. The vehicle was moved into the environmental simulation chamber for low-temperature immersion treatment and kept locked for more than 8 hours to ensure uniform temperature distribution throughout the vehicle. The charging equipment was used to charge the vehicle to the preset SOC range in a low-temperature environment, creating the required low-temperature and low-charge conditions for testing. Special test conditions were designed for different usage scenarios, including extreme low temperatures, critical temperature points, and SOC boundary conditions. During the test, the core monitoring and data recording process involved real-time acquisition of key parameters such as the output current / power of the charging equipment, the temperature change curve of the power battery, the SOC value change, and the working status of the PTC heater. Special attention was paid to the relationship between the grid current and the power battery's operating status. The system monitors the relationship between battery temperature and the energy source of the charging port insulation function to verify its rationality. It also precisely monitors the function's trigger conditions to confirm whether the system can accurately start when the battery temperature drops to the preset low-temperature threshold. Detailed temperature control performance is recorded to assess whether the battery pack can reach and stabilize within the target temperature range. The system monitors the function's exit conditions to verify whether the system can exit normally when the temperature reaches the set value or the heating time meets the requirements. Continuous tracking of battery SOC changes determines whether energy consumption is solely caused by standby power consumption. After the test, by comparing the actual SOC change with the theoretical standby power consumption decrease, and combining PTC operating status and temperature data for cross-validation, the system comprehensively analyzes the performance of the charging port insulation function to ensure its normal operation under fast charging, slow charging, and various boundary conditions, providing reliable protection for battery thermal management in low-temperature environments for electric vehicles.

[0068] Each step of this test method is explained in detail: Test preparation Equipment requirements: A walk-in environmental chamber with precise temperature control (e.g., -40℃ to +60℃) is required, along with standard AC and DC charging equipment, a high-precision power analyzer (capable of recording the power output of the charging equipment and the vehicle's high-voltage system, and calculating power and cumulative charge), diagnostic tools (capable of analyzing battery temperature, SOC, and other signals of comparable models), and a data acquisition device (capable of simultaneously recording the charging pile's output current / power, ambient temperature data, and vehicle power CAN bus data (including parameters such as multi-point battery pack temperature, SOC, and high-voltage relay status)).

[0069] Vehicle settings: The vehicle is equipped with a heat gun insulation function, and ensures that the vehicle's "heat gun insulation" function is activated in the central control system and the vehicle is in a fault-free state.

[0070] Test execution steps Initial State Recording: Record the initial SOC value and temperature of the vehicle's power battery at room temperature. The vehicle's battery charging port insulation function is set to the on state.

[0071] Low-temperature vehicle immersion: Move the vehicle into an environmental chamber and set it to the target test temperature (e.g., -10℃, -20℃). Keep the vehicle locked and stationary for a sufficient period of time (e.g., 14 to 16 hours) to allow the battery temperature to drop evenly and stably to the ambient temperature. This step simulates the real-world scenario of a user's vehicle spending the night in a low-temperature environment and is a prerequisite for the effective triggering of the function.

[0072] Charging process: In low-temperature environments, use the selected charging equipment to charge the vehicle to preset conditions (such as 100% or 80% SOC).

[0073] Verification of the heat preservation function of the gun insertion device: (1) Function trigger judgment: After charging is completed (the charging device displays that charging is complete), keep the charging gun connected and the vehicle locked, and continue to leave the vehicle stationary in a low temperature environment; monitor whether the system automatically triggers the charging gun heat preservation function when the battery temperature is lower than the set threshold (such as -5℃).

[0074] (2) Energy source verification: During the function triggering period, use a data logger to synchronously and accurately monitor the power / current of the vehicle drawing power from the charging equipment, as well as the current of the power battery and PTC heater, and the SOC value of the power battery; if the function is normal, a continuous small current output should be observed on the charging equipment side, and the SOC of the power battery should remain absolutely stable or only slightly decrease due to the standby power consumption of the whole vehicle; if the SOC drops significantly, it can be determined that the vehicle plug-in heat preservation function is abnormal and the energy source is not entirely from the charging equipment.

[0075] (3) Temperature control performance verification: Record the temperature change curve of the battery pack after the function is started, and evaluate whether it can quickly and accurately reach and stabilize within the preset target temperature range (such as 15-25℃).

[0076] (4) Function exit verification: Monitor whether the system can automatically stop heating when the battery temperature reaches the target value or the preset heating time; if necessary, monitor whether the function can be triggered again and exit normally when the battery temperature is lower than the target temperature again.

[0077] Special and boundary tests To fully evaluate the functionality, the following extended tests are also required: Compatibility testing: Repeat the above tests using AC and DC charging devices of different specifications to verify the adaptability of the function to different charging devices and charging modes.

[0078] Boundary condition testing: Verify the triggering logic, stability, and coping strategies of the function under extreme low temperatures (e.g., -30℃), battery temperature critical points (e.g., -5℃), and battery SOC critical points (e.g., 20%).

[0079] It should be noted that, compared with the prior art, the testing method provided in this embodiment has the following significant advantages: Accurate and comprehensive evaluation: Through multi-dimensional indicators and standard procedures, especially the accurate determination of energy sources, we ensure that the test results are comprehensive and reliable, and can scientifically quantify the merits and demerits of functions.

[0080] Accurate and reliable judgment: It clearly proposes "synchronous monitoring of charging equipment output and PTC heater current, power battery output and SOC stability" as the core criterion for energy source. The method is intuitive and the data is reliable, fundamentally solving the verification problem.

[0081] Highly practical and repeatable: The methods and steps are clear and highly operable, and can be used in R&D, production quality inspection and third-party verification agencies. The standardized process ensures that the test results are highly repeatable at different times and locations.

[0082] The guidance is clear: the quantitative results can not only be used for functional acceptance, but also provide clear, data-driven improvement directions for functional optimization in the R&D phase (such as control strategy adjustment and energy consumption optimization).

[0083] This embodiment, through the above-described scheme, extracts the output current / power data of the charging device from the key parameters. Based on the output current / power data, the change data of the SOC value, and the vehicle's static standby power consumption model, it calculates the theoretical decrease in battery power corresponding to the theoretical standby power consumption of the entire vehicle during the operation of the plug-in heat preservation function. It quantitatively compares the actual measured change in the battery power among the key parameters with the theoretical decrease in battery power to determine the energy source of the plug-in heat preservation function. Through systematic parameter monitoring and analysis, it can accurately distinguish whether the energy during the operation of the plug-in heat preservation function is provided by external charging equipment or discharged by the battery itself. It comprehensively verifies the reliability of the function triggering conditions, temperature control performance, and exit logic, and promptly identifies abnormal battery discharge problems caused by defects in energy management strategies. This ensures the normal operation of the battery thermal management function of electric vehicles in low-temperature environments, improving the safety and user experience in cold climates.

[0084] Accordingly, the present invention further provides a test device for the heat preservation function of electric vehicle plug guns.

[0085] Reference Figure 7 , Figure 7 This is a functional block diagram of the first embodiment of the electric vehicle plug-in insulation function testing device of the present invention.

[0086] In a first embodiment of the electric vehicle plug insulation function testing device of the present invention, the electric vehicle plug insulation function testing device includes: The vehicle immersion charging module 10 is used to place the electric vehicle in a predetermined low-temperature environment for immersion treatment and charge it to a preset SOC range, so that the temperature of the electric vehicle's power battery drops below a predetermined low-temperature threshold.

[0087] The monitoring and recording module 20 is used to monitor the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery while maintaining the physical connection between the charging gun and the electric vehicle. When the battery temperature drops to the predetermined low temperature threshold, the charging gun insulation function is triggered and key parameters during the operation of the function are recorded.

[0088] The energy source determination module 30 is used to determine the energy source of the gun heat preservation function based on the changes in the key parameters and the SOC value.

[0089] The immersion charging module 10 is also used to move the electric vehicle into the environmental simulation chamber, control the temperature regulation system of the environmental simulation chamber to reduce the temperature inside the chamber to a preset low temperature range at a preset cooling rate; keep the electric vehicle in a locked state for immersion treatment, charge the electric vehicle to a preset SOC range, and reduce the temperature of the electric vehicle's power battery to below a predetermined low temperature threshold.

[0090] The immersion charging module 10 is also used to keep the electric vehicle in a locked state during immersion treatment, so that the temperature of all components of the vehicle is evenly distributed. After the immersion treatment reaches the predetermined immersion time, it connects to a standard charging device to charge the electric vehicle until the state of charge of the electric vehicle's power battery reaches the preset SOC range. It continuously monitors the temperature data of each temperature measuring point of the power battery to confirm that the power battery temperature drops below the predetermined low temperature threshold.

[0091] The monitoring and recording module 20 is also used to monitor the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery when the charging gun is physically connected to the charging interface of the electric vehicle and no charging current is transmitted; when the average temperature or minimum temperature of the key temperature measurement point of the power battery reaches the preset low temperature threshold, the charging gun insulation function of the electric vehicle is automatically triggered, and the key parameters during the operation of the function are recorded synchronously.

[0092] The monitoring and recording module 20 is also used to collect temperature changes at key locations within the power battery in real time through a distributed temperature sensor network when the charging gun is physically connected to the charging interface of the electric vehicle and no charging current is transmitted. At the same time, it uses the current and voltage monitoring module built into the charging equipment and the vehicle BMS system to obtain the output parameters of the charging equipment and the SOC value of the power battery.

[0093] The energy source determination module 30 is also used to extract the output current / power data of the charging device from the key parameters, and calculate the theoretical decrease in power corresponding to the theoretical standby power consumption of the whole vehicle during the operation of the plug-in heat preservation function based on the output current / power data, the change data of the SOC value, and the vehicle static standby power consumption model; and quantitatively compare the actual measured change in the power battery power in the key parameters with the theoretical decrease in power to determine the energy source of the plug-in heat preservation function.

[0094] The energy source determination module 30 is further configured to quantitatively compare the actual measured change in the battery charge of the power battery with the theoretical decrease in charge in the key parameters; when the actual change in charge matches the theoretical decrease in charge, and the charging device continuously outputs current / power, it is determined that the energy of the plug-in heat preservation function comes from the external charging device; when the difference between the actual change in charge and the theoretical decrease in charge is greater than the change in charge corresponding to the output energy of the charging device, it is determined that the energy of the plug-in heat preservation function comes from the battery's own charge; cross-validation is performed by calling the PTC heater operating status data and temperature change curve in the key parameters, and if the temperature rises and the decrease in charge matches the difference in output energy of the charging device, it is determined that part of the energy of the plug-in heat preservation function comes from the self-discharge of the power battery.

[0095] The steps for implementing each functional module of the electric vehicle plug-in insulation function testing device can be referred to in the various embodiments of the electric vehicle plug-in insulation function testing method of the present invention, and will not be repeated here.

[0096] Furthermore, this embodiment of the invention also proposes a storage medium storing a test program for the heat preservation function of an electric vehicle plug nozzle. When the test program for the heat preservation function of an electric vehicle plug nozzle is executed by a processor, it performs the following operations: The electric vehicle is immersed in a predetermined low-temperature environment and charged to a predetermined SOC range, so that the temperature of the electric vehicle's power battery drops below a predetermined low-temperature threshold. While maintaining the physical connection between the charging gun and the electric vehicle, the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery are monitored. When the battery temperature drops to the predetermined low temperature threshold, the charging gun insulation function is triggered and key parameters during the operation of the function are recorded. The energy source for the heat preservation function of the gun is determined based on the changes in the key parameters and the SOC value.

[0097] Furthermore, when the electric vehicle plug-in insulation function test program is executed by the processor, it also performs the following operations: The electric vehicle is moved into the environmental simulation chamber, and the temperature regulation system of the environmental simulation chamber is controlled to reduce the temperature inside the chamber to a preset low temperature range at a preset cooling rate. The electric vehicle is kept in a locked state and immersed in water. The electric vehicle is charged to a preset SOC range, and the temperature of the electric vehicle's power battery is reduced to below a predetermined low temperature threshold.

[0098] Furthermore, when the electric vehicle plug-in insulation function test program is executed by the processor, it also performs the following operations: The electric vehicle is kept in a locked state for immersion treatment to ensure uniform temperature distribution of all components. After the immersion treatment reaches the predetermined immersion time, a standard charging device is connected to charge the electric vehicle until the state of charge of the electric vehicle's power battery reaches the preset SOC range. Continuously monitor the temperature data at each temperature measurement point of the power battery to confirm that the power battery temperature drops below the predetermined low temperature threshold.

[0099] Furthermore, when the electric vehicle plug-in insulation function test program is executed by the processor, it also performs the following operations: While the charging gun remains physically connected to the charging interface of the electric vehicle and no charging current is transmitted, monitor the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery. When the average or minimum temperature of the key temperature measurement points of the power battery reaches the preset low temperature threshold, the electric vehicle's plug-in insulation function is automatically triggered, and key parameters during the function operation are recorded synchronously.

[0100] Furthermore, when the electric vehicle plug-in insulation function test program is executed by the processor, it also performs the following operations: With the charging gun physically connected to the charging interface of the electric vehicle and no charging current being transmitted, the temperature changes at key locations within the power battery are collected in real time through a distributed temperature sensor network. At the same time, the output parameters of the charging equipment and the SOC value of the power battery are obtained using the current and voltage monitoring module built into the charging equipment and the vehicle BMS system.

[0101] Furthermore, when the electric vehicle plug-in insulation function test program is executed by the processor, it also performs the following operations: The output current / power data of the charging device is extracted from the key parameters. Based on the output current / power data and the change data of the SOC value, combined with the vehicle static standby power consumption model, the theoretical power consumption reduction corresponding to the theoretical standby power consumption of the whole vehicle during the operation of the plug-in heat preservation function is calculated. The energy source of the plug-in heat preservation function is determined by quantitatively comparing the actual measured change in the power battery charge among the key parameters with the theoretical decrease in charge charge.

[0102] Furthermore, when the electric vehicle plug-in insulation function test program is executed by the processor, it also performs the following operations: The actual measured change in the power battery's charge level among the key parameters is quantitatively compared with the theoretical decrease in charge level. When the actual change in the amount of electricity matches the theoretical decrease in the amount of electricity, and the charging device continuously outputs current / power, it is determined that the energy for the plug-in heat preservation function comes from the external charging device. When the difference between the actual change in power and the theoretical decrease in power is greater than the change in power corresponding to the output energy of the charging device, it is determined that the energy of the plug-in heat preservation function comes from the power battery's own power. Cross-validation is performed by calling the PTC heater operating status data and temperature change curve from the key parameters. If the temperature rises and the power decreases match the difference in output energy of the charging device, it is determined that the energy of the plug-in heat preservation function comes from the self-discharge of the power battery.

[0103] Those skilled in the art will understand that all or part of the steps in the methods described above can be implemented by a program instructing related hardware. The program is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium is a computer-readable storage medium, including: USB flash drive, mobile hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, and other media that can store program code.

[0104] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0105] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0106] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for testing the heat preservation function of an electric vehicle plug, characterized in that, The electric vehicle plug-in insulation function test method includes: The electric vehicle is immersed in a predetermined low-temperature environment and charged to a predetermined SOC range, so that the temperature of the electric vehicle's power battery drops below a predetermined low-temperature threshold. While maintaining the physical connection between the charging gun and the electric vehicle, the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery are monitored. When the battery temperature drops to the predetermined low temperature threshold, the charging gun insulation function is triggered and key parameters during the operation of the function are recorded. The energy source for the heat preservation function of the gun is determined based on the changes in the key parameters and the SOC value.

2. The electric vehicle plug-in insulation function test method as described in claim 1, characterized in that, The step of immersing the electric vehicle in a predetermined low-temperature environment and charging it to a predetermined SOC range, thereby reducing the temperature of the electric vehicle's power battery to below a predetermined low-temperature threshold, includes: The electric vehicle is moved into the environmental simulation chamber, and the temperature regulation system of the environmental simulation chamber is controlled to reduce the temperature inside the chamber to a preset low temperature range at a preset cooling rate. The electric vehicle is kept in a locked state and immersed in water. The electric vehicle is charged to a preset SOC range, and the temperature of the electric vehicle's power battery is reduced to below a predetermined low temperature threshold.

3. The electric vehicle plug-in insulation function test method as described in claim 2, characterized in that, The process of keeping the electric vehicle in a locked state during immersion treatment, charging the electric vehicle to a preset SOC range, and reducing the temperature of the electric vehicle's power battery to below a predetermined low-temperature threshold includes: The electric vehicle is kept in a locked state for immersion treatment to ensure uniform temperature distribution of all components. After the immersion treatment reaches the predetermined immersion time, a standard charging device is connected to charge the electric vehicle until the state of charge of the electric vehicle's power battery reaches the preset SOC range. Continuously monitor the temperature data at each temperature measurement point of the power battery to confirm that the power battery temperature drops below the predetermined low temperature threshold.

4. The electric vehicle plug-in insulation function test method as described in claim 1, characterized in that, While maintaining the physical connection between the charging gun and the electric vehicle, the system monitors the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery. When the battery temperature drops to the predetermined low-temperature threshold, the charging gun insulation function is triggered, and key parameters during the function's operation are recorded, including: While the charging gun remains physically connected to the charging interface of the electric vehicle and no charging current is transmitted, monitor the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery. When the average or minimum temperature of the key temperature measurement points of the power battery reaches the preset low temperature threshold, the electric vehicle's plug-in insulation function is automatically triggered, and key parameters during the function operation are recorded synchronously.

5. The electric vehicle plug-in insulation function test method as described in claim 4, characterized in that, The monitoring of the temperature change of the power battery, the output parameters of the charging equipment, and the SOC value of the power battery while the charging gun remains physically connected to the charging interface of the electric vehicle and no charging current is transmitted includes: With the charging gun physically connected to the charging interface of the electric vehicle and no charging current being transmitted, the temperature changes at key locations within the power battery are collected in real time through a distributed temperature sensor network. At the same time, the output parameters of the charging equipment and the SOC value of the power battery are obtained using the current and voltage monitoring module built into the charging equipment and the vehicle BMS system.

6. The electric vehicle plug-in insulation function test method as described in claim 1, characterized in that, The method of determining the energy source of the heat preservation function of the gun based on the changes in the key parameters and the SOC value includes: The output current / power data of the charging device is extracted from the key parameters. Based on the output current / power data and the change data of the SOC value, combined with the vehicle static standby power consumption model, the theoretical power consumption reduction corresponding to the theoretical standby power consumption of the whole vehicle during the operation of the plug-in heat preservation function is calculated. The energy source of the plug-in heat preservation function is determined by quantitatively comparing the actual measured change in the power battery charge among the key parameters with the theoretical decrease in charge charge.

7. The electric vehicle plug-in insulation function test method as described in claim 6, characterized in that, The step of quantitatively comparing the actual measured change in the power battery's charge level with the theoretical decrease in charge level among the key parameters to determine the energy source of the plug-in heat preservation function includes: The actual measured change in the power battery's charge level among the key parameters is quantitatively compared with the theoretical decrease in charge level. When the actual change in the amount of electricity matches the theoretical decrease in the amount of electricity, and the charging device continuously outputs current / power, it is determined that the energy for the plug-in heat preservation function comes from the external charging device. When the difference between the actual change in power and the theoretical decrease in power is greater than the change in power corresponding to the output energy of the charging device, it is determined that the energy of the plug-in heat preservation function comes from the power battery's own power. Cross-validation is performed by calling the PTC heater operating status data and temperature change curve from the key parameters. If the temperature rises and the power decreases match the difference in output energy of the charging device, it is determined that the energy of the plug-in heat preservation function comes from the self-discharge of the power battery.

8. A device for testing the heat preservation function of an electric vehicle plug nozzle, characterized in that, The electric vehicle plug-in heat preservation function testing device includes: The vehicle immersion charging module is used to place an electric vehicle in a predetermined low-temperature environment for immersion treatment and charge it to a predetermined SOC range, so that the temperature of the electric vehicle's power battery drops below a predetermined low-temperature threshold. The monitoring and recording module is used to monitor the temperature change of the power battery, the output parameters of the charging equipment and the SOC value of the power battery while maintaining the physical connection between the charging gun and the electric vehicle. When the battery temperature drops to the predetermined low temperature threshold, the charging gun insulation function is triggered and key parameters during the operation of the function are recorded. The energy source determination module is used to determine the energy source of the gun heat preservation function based on the changes in the key parameters and the SOC value.

9. A device for testing the heat preservation function of an electric vehicle plug nozzle, characterized in that, The electric vehicle plug-in insulation function testing device includes: a memory, a processor, and an electric vehicle plug-in insulation function testing program stored in the memory and executable on the processor. The electric vehicle plug-in insulation function testing program is configured to implement the steps of the electric vehicle plug-in insulation function testing method as described in any one of claims 1 to 7.

10. A storage medium, characterized in that, The storage medium stores a test program for the heat preservation function of electric vehicle plug nozzles. When the test program for the heat preservation function of electric vehicle plug nozzles is executed by the processor, it implements the steps of the test method for the heat preservation function of electric vehicle plug nozzles as described in any one of claims 1 to 7.

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