Intelligent charging / discharging test device and method for electric vehicles

Abstract

An intelligent charging and discharging test device and method for an electric vehicle is provided. [Solution] The device according to the present invention includes a charge / discharge control unit, a low-voltage power supply unit, a charge / discharge metering unit, a bidirectional AC / DC electric energy conversion unit, an insulation monitoring unit, a switch unit, a charge / discharge connection unit, a message reading unit, a wireless communication unit, a temperature collection unit, and an industrial control unit, wherein the insulation monitoring unit is connected to the switch unit and the bidirectional AC / DC electric energy conversion unit, the message reading unit is connected to the charge / discharge connection unit and the industrial control unit, and a cloud platform is connected to the wireless communication unit and the industrial control unit. The present invention can actively control whether the insulation monitoring function is turned on, thereby achieving accurate control of the charge / discharge current and improving the accuracy, controllability, and reliability of the charge / discharge test.

Description

[Technical Field]

[0001] The present invention relates to the technical field of testing electric vehicles, and more particularly to an intelligent charging and discharging testing device and method for electric vehicles. [Background technology]

[0002] Traditional charging station technology is gradually integrating more intelligent functions, such as wireless communication, remote monitoring and control, and data analysis. This allows charging stations to be more smoothly integrated into intelligent power grid systems. EMC testing is crucial for ensuring the safety of charging stations. EMC testing primarily focuses on the electromagnetic compatibility (EMC) of products and includes EMI testing, EMS testing, and special tests. EMI testing evaluates the level of electromagnetic interference (EMI) generated by a product and aims to prevent it from affecting other electronic devices. EMS testing evaluates a product's immunity to electromagnetic interference and ensures normal operation in an electromagnetic environment. Special tests include surge tests, voltage changes, and flashing tests. These tests are conducted in accordance with international or regional standards, such as VDE 0843.

[0003] Conventional test equipment cannot meet future electromagnetic compatibility (EMC) testing requirements, particularly the requirement to "adjust the current." This makes it difficult to accurately control the magnitude of the charge / discharge current. Furthermore, the insulation monitoring function in conventional charging stand equipment is usually kept on. This makes it prone to false alarms in certain test environments (e.g., EMC tests), affecting the progress of the test. Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, there is a need for an intelligent charge / discharge test device and method for electric vehicles that can actively control the on / off of the insulation monitoring function and accurately control the charge / discharge current, thereby improving the accuracy, controllability, and reliability of the charge / discharge test. [Means for solving the problem]

[0005] To solve the above technical problems, the present invention provides an intelligent charge / discharge test device and method for electric vehicles, which can actively control the on / off of the insulation monitoring function and accurately control the charge / discharge current, thereby improving the accuracy, controllability, and reliability of the charge / discharge test.

[0006] The present invention provides an intelligent charge / discharge test device for electric vehicles, which is applicable to accurate charge / discharge control tests, charge / discharge compatibility evaluation tests, power battery state evaluation tests, and DC charging electromagnetic compatibility test items, and the device includes a charge / discharge control unit, a low-voltage power supply unit, a charge / discharge metering unit, a bidirectional AC / DC electric energy conversion unit, an insulation monitoring unit, a switch unit, a charge / discharge connection unit, a message reading unit, a wireless communication unit, an industrial control unit, and a cloud platform, the charge / discharge control unit has a function of receiving a command sent from the industrial control unit or a command sent from the cloud platform via the wireless communication unit, and uploading information to the industrial control unit or uploading information to the cloud platform via the wireless communication unit, and is further used for collecting and controlling information of other units connected to the charge / discharge control unit; The low-voltage power supply unit is connected to the charge / discharge control unit and is used to convert the AC power energy into low-voltage DC energy required for the normal operation of the charge / discharge control unit; The charge / discharge metering unit is connected to the charge / discharge control unit, and is used to collect AC input and DC output electrical energy parameters, and upload the collected information to the charge / discharge control unit to control the output voltage and current; The bidirectional AC / DC electric energy conversion unit is connected to the charge / discharge control unit and the low-voltage power supply unit to realize bidirectional AC / DC conversion and realize charging and discharging; The insulation monitoring unit is connected to the charge / discharge control unit and the bidirectional AC / DC electric energy conversion unit, and is used to monitor the insulation during charging and discharging. The insulation monitoring unit has a built-in switch or relay, which can be switched on / off according to the command of the charge / discharge control unit, thereby controlling the activation / deactivation of the insulation monitoring unit. the switch unit is connected to the charge / discharge control unit and the insulation monitoring unit, and is used to turn on / off the transmission of energy; the charging / discharging connection unit is connected to the charging / discharging control unit and the switch unit, and is compatible with the charging interface of the electric vehicle, and is used to realize charging and discharging of the electric vehicle; the charging / discharging connection unit has a built-in temperature sensor, and is used to monitor the temperature rise of the power terminal; the message reading unit is connected to the charge / discharge connection unit and the industrial control unit, and is used to read and analyze the communication messages during charging / discharging to obtain the parameters and the state quantities of the power battery during charging / discharging; the wireless communication unit is connected to the charge / discharge control unit and the cloud platform, and is used to establish communication between the charge / discharge control unit and the cloud platform; The industrial control unit is connected to the charge / discharge control unit and the cloud platform to realize charging and discharging, display information during charging and discharging, and collect, record and analyze charge / discharge communication messages in real time; The cloud platform is connected to the wireless communication unit and the message reading unit, thereby obtaining all information during charging and discharging through the message reading unit, and obtaining all information obtained by the charging and discharging control unit through the wireless communication unit.

[0007] The present invention further provides an intelligent charging and discharging test method for electric vehicles, which is implemented by the intelligent charging and discharging test device for electric vehicles described in any one of the above, specifically including: accurate control test of charging and discharging, evaluation test of charging and discharging compatibility, evaluation test of power battery state, and electromagnetic compatibility test of DC charging; Specifically, accurate control testing of charge and discharge is as follows: inputting a preset charging current value or a preset discharging current value into a charge / discharge control module of the industrial control unit; The charge / discharge control module determines an actual transmission current value according to a protection policy, where the protection policy is based on a preset charge current value or a preset discharge current value, a required value of the charge / discharge current of the power battery, and a charge / discharge current value of the power battery 1C, and selects the minimum value among them as the actual transmission current value; and the charge / discharge control unit transmits the determined actual transmission current value to the bidirectional AC / DC electric energy conversion unit to realize accurate charging / discharging; Specifically, the charge / discharge compatibility evaluation test includes the following: connecting the charge / discharge connection unit to the vehicle under test and charging or discharging the vehicle under test; a charge / discharge compatibility diagnostic module of the industrial control unit automatically recording communication messages during charging / discharging; and comparing the recorded communication message with a charge / discharge compatibility database built into the industrial control unit to obtain a compatibility diagnosis result; Specifically, the power battery condition evaluation test includes the following: connecting a charge / discharge connection unit to a vehicle under test; Recording an initial SOC value before the start of charging or discharging by a power battery state assessment module of the industrial control unit; Charging or discharging the test vehicle for a predetermined time based on the current SOC state of the test vehicle, and recording the cut-off SOC value after completion; calculating the state of health of the power battery; Specifically, the electromagnetic compatibility test for DC charging includes: controlling the insulation monitoring unit to be turned off by a charge / discharge electromagnetic compatibility test control module of the industrial control unit; inputting a preset charging current value or a preset discharging current value through a charge / discharge electromagnetic compatibility test control module of the industrial control unit; The charge / discharge electromagnetic compatibility test control module determines an actual transmission current value based on the protection policy; The charging / discharging control unit transmits the determined actual transmitting current value to the bidirectional AC / DC electric energy conversion unit to perform accurate charging / discharging and also perform electromagnetic compatibility testing for DC charging. [Effects of the Invention]

[0008] The embodiments of the present invention have the following technical effects. In this invention, the industrial control unit, charge / discharge control unit, and insulation monitoring unit work together to achieve accurate and safe charge / discharge control. Protection policies are also established for charge / discharge to prevent excessive charge / discharge currents from damaging the battery. Furthermore, communication messages during charge / discharge are automatically recorded and compared with a database to evaluate communication compatibility between the vehicle and the charging station, determine whether the communication process complies with standard specifications, and verify the accuracy and stability of data transmission. Relevant parameters contained in the charge / discharge communication messages are analyzed to evaluate the power battery's status and provide a simple method for estimating the power battery's health. This enables accurate control of charge / discharge currents and meets the current adjustability requirements of future EMC standards. During EMC testing, the charging station's insulation monitoring function can be turned off to avoid false alarms caused by filters and ensure smooth testing.

[0009] Furthermore, by utilizing the cloud platform, remote monitoring, data analysis, and control of the charging and discharging process can be realized, improving the efficiency of management and maintenance. [Brief explanation of the drawings]

[0010] In order to more clearly describe the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly describe the drawings required for describing the specific embodiments or the prior art. It is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can further obtain other drawings based on these drawings without any creative efforts. [Figure 1] 1 is a schematic diagram illustrating the configuration of an intelligent charge / discharge test device for an electric vehicle according to an embodiment of the present invention; [Figure 2] 1 is a schematic diagram illustrating the configuration of a charge / discharge control module according to an embodiment of the present invention. [Figure 3] 1 is a schematic diagram illustrating the configuration of a charge-discharge electromagnetic compatibility test control module according to an embodiment of the present invention; [Figure 4]1 is a schematic diagram illustrating the configuration of a charge-discharge compatibility diagnosis module according to an embodiment of the present invention; [Figure 5] 1 is a schematic diagram illustrating the configuration of a power battery state evaluation module according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] In order to clarify the objectives, technical solutions and advantages of the present invention, the technical solutions of the present invention will be described clearly and completely below. It should be noted that the described embodiments are only some examples of the present invention and do not cover all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative work are included in the protection scope of the present invention.

[0012] This invention proposes an intelligent charge / discharge testing device for electric vehicles. Figure 1 is a schematic diagram of the configuration of an intelligent charge / discharge testing device for electric vehicles according to an embodiment of the invention. Referring to Figure 1, this device is applicable to test items such as precise charge / discharge control test, charge / discharge compatibility evaluation test, power battery state evaluation test, and DC charging electromagnetic compatibility. The device includes a charge / discharge control unit, a low-voltage power supply unit, a charge / discharge metering unit, a bidirectional AC / DC electric energy conversion unit, an insulation monitoring unit, a switch unit, a charge / discharge connection unit, a message reading unit, a wireless communication unit, a temperature collection unit, an industrial control unit, and a cloud platform.

[0013] Furthermore, a liquid cooling system can be added depending on the demand for charging and discharging power, and the charging and discharging connection unit must be configured with a liquid cooling function.

[0014] The charge / discharge control unit is usually implemented by a microprocessor or a single-chip microcomputer, and is used to receive commands sent from the industrial control unit or commands sent from the cloud platform via the wireless communication unit, upload the acquired information to the industrial control unit or upload information to the cloud platform via the wireless communication unit, and collect and control information from other units (excluding the industrial control unit and the low-voltage power supply unit) connected to the charge / discharge control unit.

[0015] The low-voltage power supply unit is connected to the charge / discharge control unit and supports the normal operation of the charge / discharge control unit by converting the energy of the AC power supply into low-voltage DC energy required for the normal operation of the charge / discharge control unit. Specifically, a 12V or 24V switching power supply may be used.

[0016] The charge / discharge metering unit is connected to the charge / discharge control unit, and is used to collect AC input and DC output electrical energy parameters, and upload the collected information to the charge / discharge control unit to control the output voltage and current. Specifically, a bidirectional coulometer or a bidirectional metering module can be used to measure the amount of electricity during charging and discharging.

[0017] Here, the AC input includes three-phase AC voltage and current, and the DC output includes the output voltage and current of the charge / discharge connection unit.

[0018] The bidirectional AC / DC electric energy conversion unit is connected to the charge / discharge control unit and the low-voltage power supply unit to realize bidirectional AC / DC conversion and to realize charging and discharging.

[0019] The insulation monitoring unit is used to realize insulation monitoring during charging and discharging, and may specifically be an insulation monitoring device, in which a switch or relay is integrated, so that it can be turned on / off based on the command of the charging and discharging control unit.

[0020] Specifically, a switch or relay is integrated inside the insulation monitoring unit, and a charge / discharge electromagnetic compatibility test control module (charge / discharge EMC test control module) in the industrial control unit transmits a command to the charge / discharge control unit, which controls the on / off of the switch or relay built into the insulation monitoring unit based on the command, thereby controlling the activation / deactivation of the insulation monitoring unit.

[0021] Furthermore, the insulation monitoring unit remains on during normal charging and discharging processes to avoid safety risks, and can remain off during DC charging electromagnetic compatibility testing to avoid interfering with the testing process.

[0022] The switch unit is connected to the charge / discharge control unit and the bidirectional AC / DC electric energy conversion unit, and is used to turn on / off the energy transmission.

[0023] The charging / discharging connection unit is connected to the charging / discharging control unit and the switch unit, and is used to match with the charging interface of the electric vehicle and realize charging and discharging of the electric vehicle, and the charging / discharging connection unit has a built-in temperature sensor and is used to monitor the temperature rise of the power terminal, where the charging / discharging connection unit may specifically be a DC charging gun, and the power terminal is a terminal for transmitting DC electrical energy in the DC charging gun.

[0024] For example, different countries have different standards, which means different charging and discharging interfaces, so the charging and discharging connection unit in this embodiment can replace connectors of different standards to suit vehicles of different national standards and realize charging and discharging.

[0025] The message reading unit is connected to the charging / discharging connection unit and the industrial control unit, and is used to read and analyze the communication messages during charging / discharging, and obtain the parameters and state quantities of the power battery during charging / discharging.

[0026] For example, the parameters and state quantities of the power battery during charging and discharging may include, for example, a measured charging voltage, a measured charging current, a maximum power battery temperature, a SOC in a charging stop state, a minimum voltage of the power battery alone, and a maximum voltage of the power battery alone, as specified in the GB / T 27930 standard.

[0027] Furthermore, for test vehicles that comply with Chinese standards, the CAN box can be selected as the message reading unit, and for test vehicles that comply with European standards, Vector's VH5110 can be selected as the message reading unit.

[0028] The wireless communication unit is connected to the charge / discharge control unit and the cloud platform, and is used to realize communication between the charge / discharge control unit and the cloud platform. This wireless communication unit realizes wireless communication function using conventional wireless communication technology, so detailed description is omitted.

[0029] The temperature collecting unit is connected to the charge / discharge control unit and is used to collect the environmental temperature status of the charge / discharge in real time. The temperature collecting unit may be a temperature sensor.

[0030] The industrial control unit is connected to the charge / discharge control unit and the cloud platform, and is used to realize charge and discharge, display charge / discharge process information, and collect, record and analyze charge / discharge communication messages in real time. The industrial control unit may specifically be an industrial PC.

[0031] Specifically, the industrial control unit can be connected to the charge / discharge control unit via RS232 (a serial communication interface standard) or CAN, etc. The industrial control unit includes a charge / discharge control module, a charge / discharge electromagnetic compatibility test control module, a charge / discharge compatibility diagnosis module, and a power battery status evaluation module.

[0032] 2 is a schematic diagram of the configuration of a charge / discharge control module according to an embodiment of the present invention. Referring to FIG. 2, the charge / discharge control module is used to receive a preset charge / discharge current value, control charging and discharging, and display charge / discharge information. The charge / discharge control module includes a charge / discharge parameter setting sub-module and a charge / discharge information display sub-module, The charging / discharging parameter setting sub-module is used to set charging / discharging parameters, including charging / discharging current value, charging / discharging cutoff SOC, etc. The charging / discharging information display sub-module is used to display parameters during charging / discharging, including charging / discharging voltage, charging / discharging current, battery SOC, and temperature of the power terminals of the charging / discharging connection unit.

[0033] 3 is a schematic diagram of a charge / discharge electromagnetic compatibility test control module according to an embodiment of the present invention. Referring to FIG. 3, the charge / discharge electromagnetic compatibility test control module is used to realize control of charge / discharge and the magnitude of charge / discharge current, to control the activation / deactivation of the insulation monitoring unit, and to display charge / discharge information. Note that the vehicle charge / discharge electromagnetic compatibility test mainly focuses on electromagnetic interference and immunity to electromagnetic interference that occur during the vehicle charging or discharging process. Here, the test for testing electromagnetic interference is generally a power supply type test, and the test for immunity to electromagnetic interference is generally an immunity test.

[0034] The charge / discharge EMC test control module includes a test parameter setting sub-module, which is used to set charge / discharge current values ​​according to test requirements. The test parameter setting sub-module is specifically embodied as a human-machine interface, which includes a charging voltage input box, a charging current input box, a charging start button, a discharging start button, etc.

[0035] During charging and discharging electromagnetic compatibility testing, the vehicle must always be in a charging or discharging state. For example, charging electromagnetic compatibility testing requires the vehicle to be in a charging state throughout the entire testing process. Therefore, before charging an electric vehicle, the vehicle's rechargeable energy storage system must be kept at a low state of charge and the charging current must not be set to an excessively high value; otherwise, it will be difficult to ensure the sustained effectiveness of the charging process. For example, when conducting a power-supply type test for charging an electric vehicle, the AC charging current should be at least 80% of the vehicle's maximum sustained charging current, and the DC charging current should be at least 20A or 20% of the vehicle's maximum sustained charging current, whichever is greater. Furthermore, when conducting an immunity test for charging an electric vehicle, the AC charging current should be at least 20% of the vehicle's maximum sustained charging current, and the DC charging current should be at least 20A or 20% of the vehicle's maximum sustained charging current, whichever is greater. Specifically, as an example, when testing the power supply type of an electric vehicle charging, enter 400V in the charging voltage input box, enter 20A in the charging current input box, and click the charging start button to charge the electric vehicle.

[0036] The function control sub-module enables / disables the insulation monitoring unit based on test requirements. This function control sub-module is specifically embodied as a human-machine interface. This interface includes an insulation monitoring tab that is turned on by default. For example, the insulation monitoring unit is maintained in an on state during normal charging and discharging processes to avoid safety risks. It is maintained in an off state during DC charging electromagnetic compatibility testing to avoid interfering with the testing process. Furthermore, for example, during DC charging electromagnetic compatibility testing, the function control sub-module in the industrial control unit transmits a command to the charging and discharging control unit, which controls the switch or relay integrated in the insulation monitoring unit to turn off based on the command, thereby turning off the insulation monitoring unit.

[0037] The charging / discharging information display sub-module is used to display parameters during charging / discharging, including the device's AC input / DC output (charging process) or AC output / DC input (discharging process) data and power battery data. AC input data includes input voltage, input current, input power, etc. DC output data includes charging voltage, charging current, charging power, etc. Power battery data includes BMS required voltage, BMS required current, SOC value, etc.

[0038] 4 is a schematic diagram of the configuration of a charge / discharge compatibility diagnosis module according to an embodiment of the present invention. Referring to FIG. 4, the charge / discharge compatibility diagnosis module is used to automatically record communication messages during charging / discharging and provide compatibility diagnosis results based on the communication messages. The charge / discharge compatibility diagnosis module includes a charge / discharge data processing sub-module and a compatibility analysis sub-module, the charging / discharging data processing submodule is connected to the charging / discharging connection unit through the message reading unit, and is used for collecting, recording and analyzing charging / discharging communication messages in real time; The compatibility analysis sub-module is used to analyze the time series of the charging / discharging communication messages, analyze whether there is a problem with the contents of the messages, and perform charging / discharging compatibility analysis.

[0039] For example, the operation process of the charge / discharge compatibility diagnostic module includes the following steps:

[0040] b1: Insert the charge / discharge connection unit into the test vehicle and charge or discharge the test vehicle. b2: The charge / discharge data processing submodule automatically records communication messages during charging / discharging. b3: The compatibility analysis submodule compares the communication messages recorded during this charging / discharging process with the charging / discharging compatibility database built into the industrial control unit; (1) Determine whether the communication process between the vehicle under test and the charging station conforms to the communication protocol specified in the standard, such as whether processes such as handshake, authentication, and data exchange can be completed accurately. (2) Check the accuracy and stability of communication message data transmission and ensure accurate exchange of information during charging and discharging. b4: Obtain a compatibility diagnosis result and display the compatibility diagnosis result obtained by the charge / discharge information display sub-module. The compatibility diagnosis result includes charge / discharge compatibility or charge / discharge incompatibility, and the cause of the incompatibility is that the communication process does not comply with the communication protocol specified in the standard, or other diagnosed causes.

[0041] The charging / discharging information display sub-module is used to display the parameters during charging / discharging.

[0042] 5 is a schematic diagram of the configuration of a power battery status evaluation module according to an embodiment of the present invention. Referring to FIG. 5, the power battery status evaluation module is used to automatically record the characteristic parameters of the power battery and perform power battery status analysis based on the characteristic parameters of the power battery. Here, the characteristic parameters of the power battery may include the maximum voltage of the power battery unit and its group number, the current state of charge (SOC), the maximum temperature of the power battery, etc. The power battery status evaluation module includes a data processing sub-module and a status analysis sub-module, the data processing sub-module is connected to the charge / discharge connection unit through the message reading unit, and is used for collecting, recording, analyzing and extracting the characteristic parameters of the power battery in the charge / discharge communication message and the charge / discharge environmental temperature collected by the temperature collecting unit in real time; The state analysis sub-module has a power battery state analysis model and algorithm embedded therein, and analyzes the battery state based on the data collected by the data processing sub-module.

[0043] The power battery state analysis model and algorithm embedded in the state analysis submodule are as follows: JPEG0007734292000002.jpg34100However, SOH indicates the battery health status, and Q 現在 is the current SOC value of the battery, Q 初期 is the initial SOC value of the battery, ΔSOC is the change in SOC during one charging process, i.e., the SOC value at the end of charging minus the SOC value at the start of charging, and C 1回の充電で充電される電気量 indicates the amount of electricity charged in one charging process, t indicates the start time of charging / discharging, t0 indicates the end time of charging / discharging, and I(t) indicates the discharge current at time t.

[0044] The cloud platform is connected to the wireless communication unit and the message reading unit, thereby obtaining all information during charging and discharging through the message reading unit, and obtaining all information obtained by the charging and discharging control unit through the wireless communication unit.

[0045] For example, it is also possible to transmit charge / discharge control commands and charge / discharge EMC test control commands via the wireless communication unit and control local hardware functions via the cloud.

[0046] In an embodiment of the present invention, there is further provided an intelligent charging / discharging test method for electric vehicles, which is implemented by the intelligent charging / discharging test device for electric vehicles described in the above embodiment, and specifically includes the following steps: This is a test to accurately control charging and discharging, and specifically includes the following steps: a1: A preset charging current value or a preset discharging current value is inputted through a charging / discharging control module in the industrial control unit. a2: The charge / discharge control module determines the actual transmission current value based on the protection policy. Here, the protection policy is as follows: Based on the preset charging current value or preset discharging current value, the required charging / discharging current value of the power battery, and the charging / discharging current value of the power battery 1C, the minimum value is selected as the actual transmitting current value, i.e., actual transmitting current value = min (preset charging current value or preset discharging current value, required charging / discharging current value of the power battery, charging / discharging current value of the power battery 1C). C is the multiplier of the battery's charging / discharging performance. 1C indicates the current intensity when the battery is fully discharged in 1 hour. For example, an 18650 battery with a nominal current of 2200 mA·h is discharged at 1C intensity for 1 hour until discharge is complete, and the actual discharge current at this time is 2200 mA. a3: The charge / discharge control unit transmits the actual transmitted current value to the bidirectional AC / DC electric energy conversion unit to achieve accurate charging and discharging.

[0047] The charge / discharge compatibility evaluation test specifically includes the following steps: b1: Insert the charge / discharge connection unit into the test vehicle and charge or discharge the test vehicle. b2: The charge / discharge data processing sub-module of the charge / discharge compatibility diagnostic module in the industrial control unit automatically records communication messages during charging / discharging, for example, after setting communication port parameters such as baud rate and data bit, records, displays, and saves the messages sent and received by the device. b3: The compatibility analysis sub-module compares the communication messages recorded during this charging / discharging process with the charging / discharging compatibility database built into the industrial control unit to obtain a compatibility diagnosis result, and the charging / discharging information display sub-module displays the obtained compatibility diagnosis result.

[0048] For example, the compatibility test results may include: (1) Charging and discharging are compatible. (2) The charging and discharging is incompatible, and the cause of the incompatibility is non-compliance with the communication protocol specified in the communication process standard or other diagnosed causes.

[0049] The power battery condition evaluation test specifically includes the following steps: c1: Insert the charge / discharge connection unit into the vehicle under test. Specifically, the vehicle to be tested is driven into the working area of ​​the intelligent charge / discharge test device, and the charge / discharge connection unit is inserted. c2: Record the initial SOC value before starting charging or discharging by the power battery state evaluation module in the industrial control unit. c3: Based on the current SOC state of the test vehicle, charge or discharge the test vehicle for a predetermined period of time, and record the cut-off SOC value after charging or discharging stops. For example, the preset time is typically set to be greater than 10 minutes. C4: Calculate the health status of the power battery, the calculation formula is as follows: JPEG0007734292000003.jpg34100However, SOH indicates the battery health status, and Q 現在 is the current SOC value of the battery, Q 初期is the initial SOC value of the battery, ΔSOC is the change in SOC during one charging process, i.e., the SOC value at the end of charging minus the SOC value at the start of charging, and C 1回の充電で充電される電気量 indicates the amount of electricity charged in one charging process, t indicates the start time of charging / discharging, t0 indicates the end time of charging / discharging, and I(t) indicates the discharge current at time t.

[0050] The DC charging electromagnetic compatibility test specifically includes the following steps: d1: The insulation monitoring unit is controlled to be turned off by the charge / discharge EMC test control module in the industrial control unit. Specifically, the insulation monitoring unit can be controlled to be turned off by the function control submodule in the charge / discharge EMC test control module. Specifically, the charging station's own insulation detection function during EMC testing can be turned off, if necessary, by the industrial control unit by turning off the insulation monitoring module, thereby avoiding the EMC darkroom filter causing a false insulation detection alarm, which would terminate charging and discharging and make it impossible to perform subsequent EMC testing. d2: Input a preset charging current value or a preset discharging current value through a charge / discharge EMC test control module in the industrial control unit. Specifically, the preset charging current value or the preset discharging current value can be input through a test parameter setting sub-module in the charge / discharge EMC test control module. d3: The charge / discharge electromagnetic compatibility test control module determines the actual transmission current value based on the protection policy. d4: The charge / discharge control unit transmits the actual transmitted current value to the bidirectional AC / DC electric energy conversion unit to realize accurate charging / discharging, and perform DC charging electromagnetic compatibility testing.

[0051] The present invention achieves accurate and safe charge and discharge control through the interoperability of the industrial control unit, charge and discharge control unit, and insulation monitoring unit. It sets protection policies for charge and discharge, preventing excessive charge and discharge currents from damaging the battery. It automatically records communication messages during charge and discharge and compares them with a database to evaluate communication compatibility between the vehicle and the charging station, determining whether the communication process complies with standard requirements. It also checks the accuracy and stability of data transmission. It analyzes relevant parameters in the charge and discharge communication messages to evaluate the status of the power battery, providing a simple method for estimating the power battery's health. This enables accurate control of charge and discharge currents and meets the current adjustability requirements of future EMC standards. During EMC testing, the charging station's insulation monitoring function can be turned off to avoid false alarms caused by filtering and ensure the test proceeds smoothly. Furthermore, the cloud platform enables remote monitoring, data analysis and control of the charging and discharging process, improving management and maintenance efficiency.

[0052] It should be noted that the terms used herein are merely for the purpose of describing specific embodiments and are not intended to limit the scope of the present application. As shown in the present specification, terms such as "a," "one," "one kind," and / or "the" do not specify the singular but may include the plural, unless the context clearly indicates an exception. The terms "comprise," "comprises," or any other variations thereof are intended to cover a non-exclusive inclusion, whereby a process, method, or apparatus comprising a set of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent in such process, method, or apparatus. Absent more limitations, elements qualified by the phrase "comprises one" do not exclude the presence of additional identical elements in the process, method, or apparatus comprising said elements.

[0053] The orientations or positional relationships indicated by terms such as "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" are based on the orientations or positional relationships shown in the drawings and are intended merely to facilitate and simplify the description of the present invention. They do not necessarily indicate or imply that the devices or elements shown necessarily have a specific orientation, or are configured or operated in a specific orientation, and therefore should not be understood as limiting the present invention. Unless otherwise specified or limited, the terms "attached," "coupled," "connected," and the like should be understood broadly and may refer, for example, to a fixed connection, a detachable connection, or an integral connection. They may also refer to a mechanical connection or an electrical connection. They may also refer to a direct connection, an indirect connection via an intermediary, or communication between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0054] Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention, and are not intended to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some or all of the technical features therein. These modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. An intelligent charge / discharge test device for an electric vehicle, comprising: The intelligent charge / discharge test device for electric vehicles is applied to charge / discharge control test, The intelligent charge / discharge testing device for electric vehicles includes a charge / discharge control unit, a low-voltage power supply unit, a charge / discharge metering unit, a bidirectional AC / DC electric energy conversion unit, an insulation monitoring unit, a switch unit, a charge / discharge connection unit, a message reading unit, a wireless communication unit, an industrial control unit and a cloud platform; The charge / discharge control unit receives commands sent from the industrial control unit, or receives commands sent from the cloud platform through the wireless communication unit, uploads information to the industrial control unit, or uploads information to the cloud platform through the wireless communication unit, and collects and controls information of other units connected to the charge / discharge control unit; the low-voltage power supply unit is connected to the charge / discharge control unit and converts AC power energy into low-voltage DC energy required for normal operation of the charge / discharge control unit; The charge / discharge metering unit is connected to the charge / discharge control unit, and collects AC input and DC output electrical energy parameters, and uploads the collected information to the charge / discharge control unit to control the output voltage and current; the bidirectional AC / DC electric energy conversion unit is connected to the charge / discharge control unit and the low-voltage power supply unit, and performs bidirectional AC / DC conversion to realize charging and discharging; the insulation monitoring unit is connected to the charge / discharge control unit and the bidirectional AC / DC electric energy conversion unit, and monitors insulation during charging and discharging; the insulation monitoring unit has a built-in switch or relay that can be switched on / off based on commands from the charge / discharge control unit, thereby controlling the activation / deactivation of the insulation monitoring unit; the switch unit is connected to the charge / discharge control unit and the insulation monitoring unit, and switches on / off the transmission of energy; the charging / discharging connection unit is connected to the charging / discharging control unit and the switch unit, and is adapted to a charging interface of the electric vehicle, and charges and discharges the electric vehicle; the charging / discharging connection unit has a built-in temperature sensor, and has a function of monitoring a temperature rise of the power terminal; the message reading unit is connected to the charging / discharging connection unit and the industrial control unit, and reads and analyzes communication messages during charging / discharging to obtain charging / discharging parameters and state quantities of the power battery; The wireless communication unit is connected to the charge / discharge control unit and the cloud platform, and performs communication between the charge / discharge control unit and the cloud platform; The industrial control unit is connected to the charge / discharge control unit and the cloud platform, and has the functions of controlling charge and discharge, displaying charge / discharge process information, and collecting, recording and analyzing charge / discharge communication messages in real time; The cloud platform is connected to the wireless communication unit and the message reading unit, and obtains all information during charging and discharging through the message reading unit, and obtains all information obtained by the charging and discharging control unit through the wireless communication unit.

2. The industrial control unit includes a charge / discharge control module, a charge / discharge electromagnetic compatibility test control module, a charge / discharge compatibility diagnosis module, and a power battery status evaluation module; The charge / discharge control module receives a preset charge / discharge current value, controls charging and discharging, and displays charge / discharge information; The charge / discharge electromagnetic compatibility test control module controls charge / discharge and the magnitude of charge / discharge current, manages the activation / deactivation of the insulation monitoring unit, and displays charge / discharge information; The charging / discharging compatibility diagnosis module automatically records communication messages during charging / discharging, and provides compatibility diagnosis results based on the communication messages; 2. The intelligent charge / discharge testing device for electric vehicles according to claim 1, wherein the power battery state evaluation module automatically records characteristic parameters of the power battery, and analyzes the power battery state according to the characteristic parameters of the power battery.

3. The charge / discharge control module includes a charge / discharge parameter setting sub-module and a charge / discharge information display sub-module; The charge / discharge parameter setting submodule sets charge / discharge parameters including a charge / discharge current value and a charge / discharge cutoff SOC; 3. The intelligent charge / discharge testing device for electric vehicles according to claim 2, wherein the charge / discharge information display sub-module displays parameters during charging / discharging, and the displayed parameters include charge / discharge voltage, charge / discharge current, battery SOC, and temperature of the power terminals of the charge / discharge connection unit.

4. The charge / discharge electromagnetic compatibility test control module includes a test parameter setting sub-module, a function control sub-module, and a charge / discharge information display sub-module; The test parameter setting sub-module sets a charge / discharge current value according to test requirements; The function control sub-module enables / disables the insulation monitoring unit based on test requirements; 4. The intelligent charging / discharging testing device for electric vehicles as claimed in claim 3, wherein the charging / discharging information display sub-module displays parameters during charging / discharging.

5. The charge / discharge compatibility diagnosis module includes a charge / discharge data processing sub-module, a compatibility analysis sub-module, and a charge / discharge information display sub-module; The charging / discharging data processing sub-module is connected to the charging / discharging connection unit through the message reading unit, and is configured to collect, record and analyze charging / discharging communication messages in real time; The compatibility analysis sub-module analyzes whether there is a problem with the time sequence and message content of the charging / discharging communication message, and performs a charging / discharging compatibility analysis; The intelligent charge / discharge testing device for electric vehicles as claimed in claim 4, wherein the charge / discharge information display sub-module displays parameters during charging / discharging.

6. The power battery state evaluation module includes a data processing sub-module and a state analysis sub-module; The data processing sub-module is connected to the charging / discharging connection unit through the message reading unit, and collects, records, analyzes, and extracts the characteristic parameters of the power battery in the charging / discharging communication message and the charging / discharging environmental temperature acquired in real time by the temperature collecting unit; 6. The intelligent charge / discharge testing device for electric vehicles according to claim 5, wherein the state analysis sub-module incorporates a power battery state analysis model and algorithm, and the state analysis sub-module performs battery state analysis based on the data collected by the data processing sub-module.

7. The intelligent charge / discharge testing device for electric vehicles further includes a temperature collection unit; 2. The intelligent charge / discharge testing device for electric vehicles according to claim 1, wherein the temperature collecting unit is connected to the charge / discharge control unit and collects environmental temperature conditions during charging / discharging in real time.

8. An intelligent charge / discharge test method for an electric vehicle, comprising: The tests performed by the intelligent charge / discharge testing device for electric vehicles according to claim 6 include a charge / discharge control test, a charge / discharge compatibility evaluation test, a power battery state evaluation test, and a DC charging electromagnetic compatibility test; The charge / discharge control test is inputting a preset charging current value or a preset discharging current value through a charge / discharge control module in the industrial control unit; The charge / discharge control module determines an actual transmission current value according to a protection policy, where the protection policy is based on a preset charge current value or a preset discharge current value, a required value of the charge / discharge current of the power battery, and a charge / discharge current value of the power battery, and determines and selects the minimum value among them as the actual transmission current value; and transmitting the actual transmission current value determined by the charge / discharge control unit to the bidirectional AC / DC electric energy conversion unit to realize charging / discharging; The charge / discharge compatibility evaluation test is connecting the charge / discharge connection unit to the vehicle under test and starting charging or discharging the vehicle under test; automatically recording communication messages during charging and discharging by a charge / discharge compatibility diagnostic module of the industrial control unit; comparing the recorded communication message with a charge / discharge compatibility database in the industrial control unit to obtain a compatibility diagnosis result; Power battery condition evaluation test: connecting a charge / discharge connection unit to a vehicle under test; using a power battery state assessment module in the industrial control unit to record an initial SOC value before the start of charging or discharging; Charging or discharging the test vehicle for a predetermined time based on the current SOC state of the test vehicle, and recording a cut-off SOC value after the charging or discharging is stopped; calculating the state of health of the power battery; DC charging electromagnetic compatibility testing is using a charge / discharge electromagnetic compatibility test control module of an industrial control unit to control the insulation monitoring unit to be turned off; Using a charge / discharge electromagnetic compatibility test control module of the industrial control unit, inputting a preset charge current value or a preset discharge current value; The charge / discharge electromagnetic compatibility test control module determines an actual transmission current value based on the protection policy; and transmitting the determined transmission current value to the bidirectional AC / DC electric energy conversion unit based on the determined transmission current value by the charge / discharge control unit to realize charging / discharging, and performing a DC charging electromagnetic compatibility test.

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