Testing device for overheat protection function of charging interface of electric vehicle

Abstract

The invention, which relates to the technical field of new energy vehicle detection, discloses a test apparatus for an overheating protection function of an electric vehicle charging interface, comprising a switching assembly, a heating assembly, a charging state detection module and a control module. Wherein the switching assembly is used for realizing connection between the charging interface and a power supply equipment plug; the heating assembly is used for heating the charging interface to a target temperature; the charging state detection module is used for monitoring the charging state of the charging interface; the control module is used for controlling the heating assembly and obtaining the charging state monitored by the charging state detection module so as to judge whether the overheat protection function of the charging interface of the electric vehicle is effective or not. According to the embodiment of the invention, the test requirements of all test samples can be met by one test device through the switching assembly, the heating temperature is accurately controlled and kept through the control module, and the universality and the accuracy of the test device are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle detection, and in particular to a test device for an overheat protection function of an electric vehicle charging interface. Background Art

[0002] With the development of new energy vehicles, the industry has put forward requirements for the temperature protection function of AC charging interfaces and DC charging interfaces, and the test methods given are methods such as applying heat sources or modifying temperature sensor parameters. Although it is possible to verify whether the vehicle or power supply equipment is designed with a charging interface temperature protection function by modifying the temperature sensor parameters or sending corresponding CAN data to simulate a fault, due to factors such as the complex design of different new energy vehicle charging interfaces, high material review, and different sensor layout positions, it is impossible to determine whether the charging interface temperature protection function can still work under real physical overtemperature. If the charging interface temperature protection fails to take effect, there is a high probability that the vehicle will experience thermal runaway during charging, resulting in property damage and casualties.

[0003] The current way to apply a heat source is to modify the vehicle socket or power supply equipment gun head under test, add a heating device and a temperature sensor to perform a physical trigger, thereby verifying the temperature protection function of the charging interface. This method has obvious disadvantages. First, for the test personnel, each vehicle or power supply equipment to be tested needs to be modified accordingly, which is a huge workload. Second, due to the tight fit of the charging interface itself, it is difficult to modify and process the relevant samples to be tested, and add heating and measuring devices. Third, the maximum voltage during charging can reach 1500V, and the insulation performance of the modified charging interface cannot be guaranteed, which can easily cause accidental electric shock injuries to personnel. Summary of the invention

[0004] The present application provides a test device for the overheat protection function of an electric vehicle charging interface, which can solve the technical problem in the prior art that verifying the overheat protection function of the charging interface is relatively complex and difficult.

[0005] An embodiment of the present application provides a test device for the overheat protection function of an electric vehicle charging interface, comprising: a switching component, which is used to realize the connection between the charging interface and the plug of a power supply device; a heating component, which is used to heat the charging interface to a target temperature, and the target temperature is a temperature that can trigger the overheat protection function of the electric vehicle charging interface; a charging status detection module, which is used to monitor the charging status of the charging interface; and a control module, which is used to control the heating component and obtain the charging status monitored by the charging status detection module, so as to judge whether the overheat protection function of the electric vehicle charging interface is effective.

[0006] In one embodiment, if the charging state is a disconnected state, it is determined that the overheat protection function of the electric vehicle charging interface is effective; if the charging state is a connected state, it is determined that the overheat protection function of the electric vehicle charging interface fails.

[0007] In one embodiment, if the adapter assembly is connected to the DC interface of the charging interface, the heating component is used to be disposed at the DC+ terminal and the DC- terminal of the charging interface; if the adapter assembly is connected to the AC interface of the charging interface, the heating component is used to be disposed at the L1 terminal and the N terminal of the charging interface.

[0008] In one embodiment, the heating component is a heating wire or a mica sheet.

[0009] In one embodiment, the charging state detection module includes: a charging parameter acquisition line, which is used to acquire the current signal, voltage signal, and message signal of the charging interface when the adapter assembly is connected to the DC interface of the charging interface, and to acquire the current signal, voltage signal, and PWM signal of the charging interface when the adapter assembly is connected to the AC interface of the charging interface; a signal analysis module, which is used to analyze the signals acquired by the charging parameter acquisition line to obtain the charging state of the charging interface.

[0010] In one embodiment, the test device further includes a temperature monitoring module; the temperature monitoring module is used to be disposed at the terminals of the charging interface to monitor the terminal temperature of the charging interface.

[0011] In one embodiment, the control module is further used to adjust the heating power of the heating component according to the temperature monitored by the temperature monitoring module to control the temperature of the charging interface terminals.

[0012] In one embodiment, the test device further includes an insulation monitoring module; the insulation monitoring module is used to monitor the insulation states of the heating component, the temperature monitoring module, and the charging state detection module, and the insulation monitoring module is used to be disposed at the PE end of the charging interface.

[0013] In one embodiment, based on the detected voltage of the PE end of the charging interface, if the voltage exceeds a preset voltage, the insulation monitoring module alarms and stops the use of the test device.

[0014] In one embodiment, the adapter assembly includes a first interface for connecting to the charging interface and a second interface for connecting to the plug of the power supply device.

[0015] The beneficial effects brought by the technical solutions provided in the embodiments of the present application include:

[0016] (1) The connection between the charging interface and the power supply device plug is realized by setting the adapter component, avoiding the need to directly modify the charging socket of the vehicle under test or the charging plug of the power supply device to add a heating and temperature control device, thereby avoiding damage to the sample under test. This is equivalent to using one test device to meet the test requirements of all test samples, with excellent versatility and high economic benefits;

[0017] (2) Through the coordinated action of the heating component, the charging status detection module and the control module, the control module can judge whether the overheat protection function of the electric vehicle charging interface is effective according to the charging status monitored by the charging status detection module. At the same time, the control module can adjust the power of the heating component according to the signal of the temperature monitoring module. This can reduce human influence factors, improve test efficiency and accuracy, and improve the precise control and maintenance of the heating temperature, and the verification of the temperature protection function is also more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the structure of the test device for the overheat protection function of the electric vehicle charging interface;

[0020] Figure 2 This is a cross-sectional view of the AC pin in the test device for the overheat protection function of the electric vehicle charging port.

[0021] In the figure: 1. Adapter component; 11. First interface; 12. Second interface; 2. Heating component; 3. Control module; 4. Temperature monitoring module; 5. Charging parameter acquisition line; 6. Signal analysis module; 7. Insulation monitoring module. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] At present, in order to test the temperature protection function of the charging interface, the way to apply the heat source is to modify the vehicle socket or power supply equipment gun head to be tested, add a heating device and a temperature sensor to perform physical triggering, thereby verifying the temperature protection function of the charging interface. This method has obvious disadvantages. First, for the testers, each vehicle or power supply equipment to be tested needs to be modified accordingly, which is a huge workload. Second, due to the tight fit of the charging interface itself, it is difficult to modify and process the relevant samples to be tested and add heating and measuring devices. Third, the maximum voltage during charging can reach 1500V, and the insulation performance of the modified charging interface cannot be guaranteed, which can easily cause accidental electric shock injuries to personnel.

[0024] The present application provides a test device for the overheat protection function of an electric vehicle charging interface, which can solve the technical problem in the prior art that verifying the overheat protection function of the charging interface is relatively complex and difficult.

[0025] Figure 1 This is a schematic diagram of the structure of the test device for the overheat protection function of the electric vehicle charging interface. Figure 2 This is a cross-sectional view of the AC pin in the test device for the overheat protection function of the electric vehicle charging port.

[0026] Combined with reference Figure 1 and Figure 2 The embodiment of the present application provides a test device for the overheat protection function of an electric vehicle charging interface, including: an adapter component 1, which is used to realize the connection between the charging interface and the plug of a power supply device; a heating component 2, which is used to heat the charging interface to a target temperature, and the target temperature is a temperature that can trigger the overheat protection function of the electric vehicle charging interface; a charging status detection module, which is used to monitor the charging status of the charging interface; a control module 3, which is used to control the heating component 2, and obtain the charging status monitored by the charging status detection module, so as to judge whether the overheat protection function of the electric vehicle charging interface is effective.

[0027] In an embodiment of the present application, if the charging state is a disconnected state, it is determined that the overheat protection function of the electric vehicle charging interface is valid; if the charging state is a connected state, it is determined that the overheat protection function of the electric vehicle charging interface is invalid.

[0028] Specifically, when the charging interface triggers the protection mechanism due to overheating, the system will automatically cut off the charging connection and make the charging state enter the disconnected state. At this time, it can be determined that the overheat protection function of the electric vehicle charging interface is effective. If the charging interface remains connected under overheating conditions, that is, the charging process is not interrupted, it indicates that the overheat protection function has not been triggered normally. At this time, it is determined that the overheat protection function of the electric vehicle charging interface is invalid.

[0029] In the embodiment of the present application, if the adapter component 1 is connected to the DC interface of the charging interface, the heating component 2 is used to be disposed at the DC+ terminal and the DC- terminal of the charging interface; if the adapter component 1 is connected to the AC interface of the charging interface, the heating component 2 is used to be disposed at the L1 terminal and the N terminal of the charging interface.

[0030] The DC charging interface (GB / T 20234.3-2015) adopts a "nine-hole" design. The DC+ terminal is the positive pole of the DC power supply, and the DC- terminal is the negative pole of the DC power supply, which is used for DC fast charging, with a maximum voltage of 1000V, a maximum current of 250A, and a maximum power of 250kW. The AC charging interface (GB / T 20234.2-2015) adopts a "seven-hole" design. The L1 terminal is the AC power line, and the N terminal is the neutral line, that is, the zero line, which supports three-phase AC charging, with a maximum voltage of 250V, a maximum current of 63A, and a maximum power of 43kW.

[0031] Specifically, the adapter component 1 includes a first interface 11 for connecting to the charging interface and a second interface 12 for connecting to the plug of the power supply device. The first interface 11 is an interface that can be adapted to conform to the DC charging interface (GB / T20234.3-2015) and the AC charging interface (GB / T 20234.2-2015), and both the first interface 11 and the second interface 12 can withstand and conduct the corresponding charging current. Thus, testers do not need to make corresponding modifications to each vehicle or power supply device to be tested, avoiding damage to the tested samples. All the test requirements of the test samples can be met through one test device, with excellent versatility, high economic benefits, and reduced workload of the testers.

[0032] In the embodiment of the present application, the heating component 2 is a heating wire or a mica sheet.

[0033] Specifically, the heating component 2 is integrated into the adapter component 1, and the heating component 2 is integrated on the surface of the DC pin or the AC pin of the charging interface. The DC pin or the AC pin respectively adapts to the jacks of the DC charging interface or the AC charging interface. Therefore, when the adapter component 1 is inserted into the charging interface of the electric vehicle or the plug of the power supply device, the heating component 2 can heat the charging interface or the plug of the power supply device. The mica sheet has good high-temperature resistance and electrical insulation properties and is suitable for high-temperature environments.

[0034] The heating wire is usually made of nickel-chromium alloy, has a high resistivity and good high-temperature resistance, and mica also has high-temperature resistance and electrical insulation characteristics and is suitable for high-temperature heating occasions. In some other embodiments of the present application, other components with high-temperature resistance can also be used to heat the charging interface, which is not limited herein.

[0035] In an embodiment of the present application, the charging state detection module includes: a charging parameter acquisition line 5, which is used to collect the current signal, voltage signal, and message signal of the charging interface when the transfer component 1 is connected to the DC interface of the charging interface, and to collect the current signal, voltage signal, and PWM signal of the charging interface when the transfer component 1 is connected to the AC interface of the charging interface; a signal parsing module 6, which is used to parse the signals collected by the charging parameter acquisition line 5 to obtain the charging state of the charging interface.

[0036] Specifically, the power supply device outputs a DC power supply or an AC power supply.

[0037] If the power supply device outputs a DC power supply, the charging interface is a DC interface, the charging parameter acquisition line 5 is connected to the DC interface, and the charging parameter acquisition line 5 collects the DC current signal, DC charging signal, and message signal of the DC interface to the signal parsing module 6. The signal parsing module 6 is integrated in the transfer component 1. The signal parsing module 6 performs real-time analysis on the collected DC current signal and DC voltage signal to determine whether the current and voltage are within the safe range, and at the same time extracts information such as the charging connection confirmation signal (such as CC1, CC2) and the communication state of the charging interface from the message signal. Among them, if the message communication is normal, the charging connection confirmation signal and the communication state of the charging interface are normal, and the current and voltage are within the safe range, it is determined that the charging state of the charging interface at this time is the connected state. If the message communication is interrupted, the charging connection confirmation signal and the communication state of the charging interface are abnormal, and the current and voltage are within the safe range, it is determined that the charging state of the charging interface at this time is the disconnected state.

[0038] If the power supply device outputs an AC power supply, the charging interface is an AC interface, the charging parameter acquisition line 5 is connected to the AC interface, and the charging parameter acquisition line 5 collects the AC current signal, AC charging signal, and PWM (pulse width modulation) signal of the direct interface to the signal parsing module 6. The signal parsing module 6 is integrated in the transfer component 1. The signal parsing module 6 performs real-time analysis on the collected AC current signal and AC voltage signal to determine whether the current and voltage are within the safe range, and at the same time detects the duty cycle and frequency in the PWM signal. Among them, if the duty cycle and frequency in the PWM signal meet the standard requirements and the current and voltage are within the safe range, it is determined that the charging state of the charging interface at this time is the connected state. If the PWM signal is interrupted or abnormal and the current and voltage are within the safe range, it is determined that the charging state of the charging interface at this time is the disconnected state.

[0039] In an embodiment of the present application, the test device further includes a temperature monitoring module 4; the temperature monitoring module 4 is used to be arranged at the terminals of the charging interface to monitor the terminal temperature of the charging interface.

[0040] Specifically, the temperature monitoring module 4 is arranged at the end where the DC pin or the AC pin faces the charging interface. When the adapter component 1 is inserted into the charging interface or the power supply device plug of the electric vehicle, the heating component 2 heats the charging interface or the power supply device plug, and the temperature monitoring module 4 monitors the terminal temperature of the charging interface.

[0041] The control module 3 is also used to adjust the heating power of the heating component 2 according to the temperature monitored by the temperature monitoring module 4 to control the temperature of the charging interface terminal. The temperature monitoring module 4 may include a temperature sensor. The temperature monitoring module 4 converts the measured temperature into a digital signal and transmits it to the control module 3. The control module 3 can adjust the heating power by controlling the current or voltage of the heating component 2 so that the temperature of the charging interface reaches a preset temperature. Therefore, by setting the control module 3, the control module 3 adjusts the power of the heating component 2 according to the signal of the temperature monitoring module 4, and the heating temperature can be accurately controlled and maintained, and the verification of the temperature protection function is more accurate. At the same time, the current charging state can be judged by the charging state detection module, and it is automatically determined whether the temperature protection function of the sample under test is effective, which reduces human factors and improves the test efficiency and accuracy.

[0042] At the same time, if the control module 3 receives information from the temperature monitoring module 4 that the temperature of the charging interface is too high, the control module 3 can also adjust the heating power to reduce the temperature of the charging interface to prevent accidents caused by overheating.

[0043] In an embodiment of the present application, the test device also includes an insulation monitoring module 7; the insulation monitoring module 7 is used to monitor the insulation status of the heating component 2, the temperature monitoring module 4 and the charging status detection module, and the insulation monitoring module 7 is used to be set at the PE end of the charging interface.

[0044] Specifically, the insulation monitoring module 7 is integrated in the adapter component 1, and when the adapter component 1 is inserted into the charging interface of the electric vehicle or the power supply device plug, the insulation monitoring module 7 can be set at the PE end (connection terminal) of the charging interface to measure the insulation resistance between the device and the ground. At the same time, the insulation monitoring module 7 is connected to the heating component 2, the temperature monitoring module 4 and the charging state detection module through the signal acquisition line, and monitors their voltage to the ground in real time, thereby judging the insulation state of each module.

[0045] The insulation monitoring module 7 is based on the detected voltage at the PE end of the charging interface. If the voltage exceeds a preset voltage, an alarm is issued and the use of the test device is stopped.

[0046] Among them, the insulation resistance of the DC circuit should not be less than 100Ω / V at the maximum working voltage. The insulation resistance of the AC circuit should not be less than 500Ω / V at the maximum working voltage.

[0047] When the insulation monitoring module 7 detects insulation abnormality, the insulation monitoring module 7 can send out an audible and visual alarm signal and automatically cut off the power supply of related equipment or prohibit the use of related functions to prevent safety problems caused by insulation failure.

[0048] Since the test device needs to be frequently plugged in and out during operation, it is easy to cause wear of the heating component 2, the temperature monitoring module 4 and the charging status detection module, resulting in insulation failure. Therefore, the provision of the insulation monitoring module 7 can avoid personal injury caused by insulation failure.

[0049] The test device for the overheat protection function of the electric vehicle charging interface disclosed in the embodiment of the present application realizes the connection between the charging interface and the power supply device plug through the setting of the adapter component, avoids directly modifying the charging socket of the vehicle being tested or the charging plug of the power supply device to add a heating and temperature control device, avoids damage to the sample being tested, and is equivalent to meeting the test requirements of all test samples through one test device, with excellent versatility and high economic benefits; through the synergistic effect of the heating component, the charging state detection module and the control module, it is possible to obtain the charging state monitored by the charging state detection module to judge whether the overheat protection function of the electric vehicle charging interface is effective, and at the same time, the control module adjusts the power of the heating component according to the signal of the temperature monitoring module. This can reduce human influence factors, improve test efficiency and accuracy, and at the same time improve the precise control and maintenance of the heating temperature, making the verification of the temperature protection function more accurate; through the setting of the insulation monitoring system, the insulation resistance of components that are easily worn and easily damaged can be monitored, and insulation monitoring can be performed throughout the life cycle of the test device due to frequent plugging and unplugging and wear, to avoid personal injury due to insulation failure and improve the safety of the test; through the setting of the control module, the accuracy and efficiency of the test device are improved, making the data in the test process more real and reliable, providing a more accurate basis for the verification of the overheating protection function of the charging port, avoiding data distortion or loss due to unexpected situations during the test, and ensuring the integrity and traceability of the test results.

[0050] To sum up, the test device for the overheat protection function of the electric vehicle charging interface proposed in the embodiment of the present application has shown significant beneficial effects in terms of versatility, safety, efficiency, cost savings and test quality, and provides more reliable technical support for the research and evaluation of the verification of the overheat protection function of the charging interface of new energy vehicles.

[0051] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0052] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0053] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. An experimental device for the overheat protection function of an electric vehicle charging interface, characterized in that, include: A switching assembly (1) for realizing the connection between the charging interface and the power supply device plug; A heating component (2) is used to heat the charging interface to a target temperature, wherein the target temperature is a temperature that can trigger an overheat protection function of the charging interface of the electric vehicle; A charging status detection module, which is used to monitor the charging status of the charging interface; The control module (3) is used to control the heating component (2) and obtain the charging state monitored by the charging state detection module to determine whether the overheating protection function of the electric vehicle charging interface is effective.

2. The test device for overheat protection function of the electric vehicle charging interface according to claim 1 is characterized in that: If the charging state is a disconnected state, it is determined that the overheat protection function of the electric vehicle charging interface is effective; If the charging state is a connected state, it is determined that the overheat protection function of the electric vehicle charging interface is invalid.

3. The test device for overheat protection function of the electric vehicle charging interface according to claim 1, characterized in that: If the adapter component (1) is connected to the DC interface of the charging interface, the heating component (2) is used to be arranged at the DC+ terminal and the DC- terminal of the charging interface; If the adapter component (1) is connected to the AC interface of the charging interface, the heating component (2) is used to be arranged at the L1 terminal and the N terminal of the charging interface.

4. The test device for the overheat protection function of the electric vehicle charging interface according to claim 3, characterized in that, The heating component (2) is a heating wire or a mica sheet.

5. The test device for the overheat protection function of the electric vehicle charging interface according to claim 1, characterized in that, The charging status detection module comprises: A charging parameter acquisition line (5), which is used to acquire a current signal, a voltage signal, and a message signal of the charging interface when the adapter component (1) is connected to the DC interface of the charging interface, and to acquire a current signal, a voltage signal, and a PWM signal of the charging interface when the adapter component (1) is connected to the AC interface of the charging interface; A signal analysis module (6) is used to analyze the signal collected by the charging parameter collection line (5) to obtain the charging state of the charging interface.

6. The test device for overheat protection function of the electric vehicle charging interface according to claim 1, characterized in that: The test device also includes a temperature monitoring module (4); The temperature monitoring module (4) is used to be arranged at the terminal of the charging interface to monitor the terminal temperature of the charging interface.

7. The test device for the overheat protection function of the electric vehicle charging interface according to claim 6, characterized in that: The control module (3) is also used to adjust the heating power of the heating component (2) according to the temperature monitored by the temperature monitoring module (4), so as to control the temperature of the charging interface terminal.

8. The test device for overheat protection function of the electric vehicle charging interface according to claim 6, characterized in that: The test device also includes an insulation monitoring module (7); The insulation monitoring module (7) is used to monitor the insulation status of the heating component (2), the temperature monitoring module (4) and the charging status detection module, and the insulation monitoring module (7) is used to be arranged at the PE end of the charging interface.

9. The test device for the overheat protection function of the electric vehicle charging interface according to claim 8, characterized in that, The insulation monitoring module (7) is based on the detected voltage at the PE end of the charging interface. If the voltage exceeds a preset voltage, an alarm is issued and the use of the test device is stopped.

10. The test device for the overheat protection function of the electric vehicle charging interface according to claim 1, characterized in that, The adapter component (1) includes a first interface (11) for connecting to a charging interface and a second interface (12) for connecting to a power supply device plug.

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