Method, system, medium and electric vehicle for detecting output voltage of charging pile

Abstract

The present invention discloses a method, system, medium and electric vehicle for detecting the output voltage of a charging pile, comprising: when a fast charging seat of an electric vehicle is connected to a charging pile plug, an insulation detection message is sent to the charging pile to trigger the charging pile to perform a pile-end insulation detection; during the process of the charging pile performing the pile-end insulation detection, a battery management controller is controlled to actively detect the insulation detection voltage formed between the fast charging positive pole and the fast charging negative pole of the fast charging seat; if the insulation detection voltage is less than the maximum charging requirement voltage at the vehicle end, the actual charging requirement voltage of the electric vehicle is constructed with reference to the insulation detection voltage, so that the actual charging requirement voltage is below the insulation detection voltage; after the electric vehicle receives the pile-end charging readiness message sent by the charging pile, the actual charging requirement voltage is sent to the charging pile, so that the charging pile supplies power according to the actual charging requirement voltage.

Description

Technical Field

[0001] The present application relates to the field of electric vehicle control technology, and in particular to a method, system, medium and electric vehicle for detecting the output voltage of a charging pile. Background Art

[0002] As the most important model for the future development of new energy vehicles, electric vehicles are experiencing rapid growth with strong national support due to their energy-saving, environmentally friendly, and pollution-free advantages. As the production capacity of new energy vehicles increases, charging safety becomes a top priority. The design requirements for onboard chargers are becoming increasingly stringent, and the demand for safety performance is also increasing. Consequently, national charging standards have been specifically designed to regulate charging safety.

[0003] According to the national charging standard, electric vehicles and charging piles must perform a handshake. When the electric vehicle receives the CRMAA message from the charging pile, the handshake is considered successful. During the handshake, both parties mutually recognize the charging protocol version, and after the handshake is successful, the charging configuration is completed. At this point, the electric vehicle sends its maximum required charging voltage to the charging pile, which then learns the charging pile's voltage output capability.

[0004] As we all know, if the required voltage of an electric vehicle exceeds the voltage output capacity of the charging station, the charging station's overvoltage protection mechanism will prohibit charging. However, under the current national charging standard, electric vehicles cannot know the voltage output capacity of the charging station in advance. For example, if the maximum charging voltage of an electric vehicle is 760V, when the maximum charging voltage of 760V is sent to the charging station, if the charging station is a 750V fast charging station, the overvoltage protection mechanism will be activated and prohibit charging, resulting in charging failure.

[0005] Therefore, how to know the voltage output capacity of the charging pile in advance to avoid charging failure is an urgent problem that needs to be solved. Summary of the Invention

[0006] In order to solve or partially solve the technical problem that the existing technology cannot know the voltage output capacity of the charging pile in advance, the present invention provides a method, system, medium and electric vehicle for detecting the output voltage of the charging pile. During the process of the charging pile performing the pile-end insulation detection, the battery management controller is controlled to actively detect the insulation detection voltage formed between the fast charging positive pole and the fast charging negative pole of the fast charging seat, so that the voltage output capacity of the pile end can be known in advance before the charging pile actively informs the voltage output capacity, thereby adjusting the actual charging requirement voltage of the electric vehicle according to the voltage output capacity of the pile end, thereby improving the charging success rate.

[0007] To solve the above technical problems, the first aspect of the present invention discloses a method for detecting the output voltage of a charging pile, the method comprising:

[0008] When the electric vehicle's fast charging station is connected to the charging pile plug, an insulation detection message is sent to the charging pile to trigger the charging pile to perform a pile end insulation test;

[0009] During the process of the charging pile performing the pile end insulation detection, the battery management controller is controlled to actively detect the insulation detection voltage formed between the fast charging positive electrode and the fast charging negative electrode of the fast charging seat; wherein the battery management controller is respectively connected to the fast charging positive electrode and the fast charging negative electrode of the fast charging seat; the insulation detection voltage is used to represent the maximum output voltage capability of the charging pile;

[0010] If the insulation detection voltage is lower than the maximum charging requirement voltage at the vehicle end, constructing the actual charging requirement voltage of the electric vehicle with reference to the insulation detection voltage so that the actual charging requirement voltage is lower than the insulation detection voltage;

[0011] After the electric vehicle receives the pile-end charging ready message sent by the charging pile, the electric vehicle sends the actual charging requirement voltage to the charging pile, so that the charging pile supplies power according to the actual charging requirement voltage.

[0012] Optionally, after sending the insulation detection message to the charging pile, the method further includes:

[0013] If the result message sent by the charging pile after performing the pile-end insulation test is not received within the first preset time range, the maximum charging requirement voltage of the vehicle end is controlled to be reduced to the insulation test voltage, and a prompt message to plug the gun again is sent;

[0014] Wherein, within a second preset time range, the vehicle-side maximum charging requirement voltage is maintained at the insulation detection voltage.

[0015] Optionally, after sending the prompt message of inserting the gun again, the method further includes:

[0016] When the fast charging seat of the electric vehicle and the charging pile are plugged in and connected again, a handshake message carrying the insulation detection voltage is sent to the charging pile to complete the handshake and charging.

[0017] Optionally, after controlling the battery management controller to actively detect the insulation detection voltage formed between the fast charging positive electrode and the fast charging negative electrode of the fast charging seat, the method further includes:

[0018] determining whether the insulation detection voltage is received within a third preset time range;

[0019] If the insulation detection voltage is received within the third preset time range, comparing the insulation detection voltage with the vehicle-side maximum charging requirement voltage and generating a comparison result; wherein the comparison result is: the insulation detection voltage is less than the vehicle-side maximum charging requirement voltage, or the insulation detection voltage is greater than or equal to the vehicle-side maximum charging requirement voltage;

[0020] If the insulation detection voltage is not received within the third preset time range, it is directly determined that the maximum output voltage capability of the charging pile is less than the maximum charging requirement voltage of the vehicle end.

[0021] Optionally, after controlling the battery management controller to actively detect the insulation detection voltage formed between the fast charging positive electrode and the fast charging negative electrode of the fast charging seat, the method further includes:

[0022] If the insulation detection voltage is greater than or equal to the vehicle-side maximum charging requirement voltage, the vehicle-side maximum charging requirement voltage is used to complete the charging configuration with the charging pile.

[0023] Optionally, after sending the actual charging requirement voltage to the charging pile, the method further includes:

[0024] According to the maximum output voltage of the charging pile sent by the charging pile, determining whether the maximum output voltage of the charging pile is lower than the lower limit voltage of the range of the voltage level of the charging pile required for charging the electric vehicle;

[0025] If so, a reminder message is sent to replace the charging pile with a higher voltage level.

[0026] Optionally, the fast charging positive electrode and the fast charging negative electrode of the fast charging seat are respectively connected to the power battery to form a charging circuit; one end detected by the battery management controller is connected between the power battery and the fast charging positive electrode, and the other end detected by the battery management controller is connected between the power battery and the fast charging negative electrode.

[0027] A second aspect of the present invention discloses a system for detecting the output voltage of a charging pile, the system comprising:

[0028] The first sending unit is used to send an insulation detection message to the charging pile when the fast charging seat of the electric vehicle is connected to the charging pile plug, so as to trigger the charging pile to perform a pile end insulation test;

[0029] The control unit controls the battery management controller to actively detect the insulation detection voltage formed between the fast-charging positive electrode and the fast-charging negative electrode of the fast-charging seat during the process of the charging pile performing the pile-end insulation detection. The battery management controller is connected to the fast-charging positive electrode and the fast-charging negative electrode of the fast-charging seat respectively. The insulation detection voltage is used to represent the maximum output voltage capability of the charging pile.

[0030] a construction unit, configured to construct an actual charging requirement voltage of the electric vehicle with reference to the insulation detection voltage if the insulation detection voltage is less than the vehicle-end maximum charging requirement voltage, so that the actual charging requirement voltage is below the insulation detection voltage;

[0031] The second sending unit is used to send the actual charging requirement voltage to the charging pile after the electric vehicle receives the pile end charging ready message sent by the charging pile, so that the charging pile supplies power according to the actual charging requirement voltage.

[0032] According to a third aspect of the present invention, a computer-readable storage medium is disclosed, on which a computer program is stored. When the program is executed by a processor, the steps of the above method are implemented.

[0033] In a fourth aspect of the present invention, an electric vehicle is disclosed, comprising a memory, a vehicle controller, and a computer program stored in the memory and executable on the vehicle controller, wherein the vehicle controller implements the steps of the above method when executing the program.

[0034] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages:

[0035] The present invention provides a method, system, medium and electric vehicle for detecting the output voltage of a charging pile. During the process of the charging pile performing the pile end insulation detection, the battery management controller is controlled to actively detect the insulation detection voltage formed between the fast charging positive electrode and the fast charging negative electrode of the fast charging seat, so that the voltage output capability of the pile end can be known in advance before the charging pile actively informs the voltage output capability, thereby adjusting the actual charging requirement voltage of the electric vehicle according to the voltage output capability of the pile end, thereby improving the charging success rate.

[0036] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0038] Figure 1 A schematic diagram of the interaction between an electric vehicle and a charging pile in the national charging standard according to an embodiment of the present invention is shown;

[0039] Figure 2 shows an internal architecture diagram of an electric vehicle according to one embodiment of the present invention;

[0040] Figure 3 A flow chart of a method for detecting the output voltage of a charging pile according to one embodiment of the present invention is shown;

[0041] Figure 4 An interactive flow chart is shown for an electric vehicle with a maximum charging requirement voltage of 850V and a charging pile of 1000V fast charging pile according to one embodiment of the present invention;

[0042] Figure 5 The following is an interactive flow chart of an electric vehicle with an 850V voltage and a charging pile with a 750V fast charging pile according to an embodiment of the present invention;

[0043] Figure 6 A schematic diagram of the composition of a system for detecting the output voltage of a charging pile according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0044] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0045] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0046] See below Figure 1 , is a schematic diagram of the interaction between electric vehicles and charging piles in the national charging standard. Figure 1 In the document, various messages between electric vehicles and charging piles are listed. The core improvement of the present invention is that in the process of performing insulation detection on the charging pile end, the battery management controller BMS and the fast charging seat are used to set up a detection circuit, and the battery management controller BMS is controlled to actively detect the insulation detection voltage formed between the fast charging positive pole and the fast charging negative pole of the fast charging seat, and the actual charging demand voltage of the electric vehicle is adaptively adjusted according to the detected insulation detection voltage, so that it adapts to the charging pile and improves the charging success rate. This solution only needs to detect the voltage at both ends of the fast charging seat to know the insulation detection voltage, without changing the communication control link of the national standard charging standard.

[0047] See Figure 2 , which shows the internal architecture of an electric vehicle, including the vehicle control unit (VCU), battery management system (BMS), and fast charging station. The VCU and BMS communicate via the vehicle CAN bus, while the VCU and fast charging station communicate via the fast charging CAN bus.

[0048] The fast-charging positive pole and the fast-charging negative pole of the fast-charging seat are respectively connected to the power battery to form a charging circuit. The charging circuit is in a disconnected state during the insulation test of the pile end. In the charging circuit, the fast-charging seat is connected to the power battery through the main relay and the fast-charging relay. Specifically, the fast-charging positive pole of the fast-charging seat is connected to the positive pole of the power battery by using the fast-charging positive relay and the main positive relay in turn, and the fast-charging negative pole of the fast-charging seat is connected to the negative pole of the power battery by using the fast-charging negative relay and the main negative relay in turn. The main relay and the fast-charging relay are in a disconnected state during the insulation test of the pile end.

[0049] The battery management controller BMS is additionally connected to the fast charging positive pole and fast charging negative pole of the fast charging seat. Specifically, one end of the battery management controller BMS detection is connected between the power battery and the fast charging positive pole, and the other end of the battery management controller BMS detection is connected between the power battery and the fast charging negative pole. When the charging pile is performing insulation detection, voltage will be generated. Since the fast charging seat and the charging pile have been plugged in, the voltage generated by the charging pile will be transmitted between the fast charging positive pole and the fast charging negative pole of the fast charging seat. Therefore, the battery management controller BMS can detect the voltage value between the fast charging positive pole and the fast charging negative pole of the fast charging seat. This voltage value is the insulation detection voltage, which is used to characterize the maximum output voltage capability of the charging pile. Detecting the insulation detection voltage means that the maximum output voltage capability of the charging pile is known.

[0050] In order to further illustrate and explain the present invention, in the first aspect, Figure 3 As shown, the method for detecting the output voltage of a charging pile provided in the embodiment of this specification is implemented on the vehicle controller VCU side and includes at least the following steps:

[0051] S101, when the electric vehicle's fast charging seat is connected to the charging pile plug, an insulation detection message is sent to the charging pile to trigger the charging pile to perform a pile-end insulation detection.

[0052] Specifically, when an electric vehicle's fast-charging station is connected to a charging pile, the charging pile sends a CHM message. Upon receiving the CHM message, the vehicle controller (VCU) sends a BHM (insulation check message) to the charging pile. Upon receiving the BHM message, the charging pile performs an insulation check on the pile end.

[0053] Furthermore, after sending the insulation check message to the charging station, the vehicle control unit (VCU) sends a communication message carrying the CHM message reception flag to the battery management controller (BMS), notifying the BMS of the upcoming insulation check. Furthermore, the VCU also sends a stop insulation check request to the BMS to stop the vehicle-side insulation test.

[0054] As an optional embodiment, after sending an insulation check message to the charging pile, if the CRM00 message, the result message sent by the charging pile after performing the pile-end insulation check, is not received within a first preset time range, it indicates that the maximum output voltage capability of the charging pile is less than the maximum charging voltage required by the vehicle. Since the insulation check voltage has been detected at this time, the maximum charging voltage required by the vehicle is controlled to be reduced to the insulation check voltage, and a prompt message is sent to plug the charger again. Sending the prompt message to plug the charger again indicates that the charging was unsuccessful. The maximum charging voltage required by the vehicle is maintained at the insulation check voltage within a second preset time range. For example, after the vehicle controller VCU sends a BHM message, if it times out for 30 seconds without receiving the CRM00 message that should have been sent after the pile-end insulation check, it is determined that the charging pile voltage upper limit is lower than the maximum charging voltage required by the vehicle. The charging pile prohibits charging due to voltage protection, and the charging will not be successful. The charging is then controlled to end, and a prompt message to plug the charger again is sent. On this basis, since the insulation detection voltage has been detected, for example, 750V, the vehicle controller VCU updates the voltage value carried by the BHM message (originally carrying the maximum charging requirement voltage on the vehicle side, such as 850V) to 750V, and maintains it at 750V within 10 minutes.

[0055] After sending the reminder message for plugging in the gun again, if within 10 minutes, when the electric vehicle's fast charging seat and charging pile are plugged in and connected again, a handshake message carrying the insulation detection voltage will be sent to the charging pile to complete the handshake and charging.

[0056] In the technical solution of the present invention, when the charging is unsuccessful, since the insulation detection voltage has been detected, the maximum charging requirement voltage at the vehicle end is lowered to the insulation detection voltage and the handshake is re-established, so that the electric start can be successfully charged, thereby improving the charging success rate.

[0057] S102, when the charging pile performs the pile end insulation detection, the battery management controller is controlled to actively detect the insulation detection voltage formed between the fast charging positive electrode and the fast charging negative electrode of the fast charging seat.

[0058] Specifically, the vehicle control unit (VCU) sends a control instruction for detecting the insulation test voltage to the battery management controller (BMS). After the BMS detects the insulation test voltage, it reports it to the VCU via the vehicle's CAN bus. This way, the maximum output voltage capability of the charging pile can be determined.

[0059] As an optional embodiment, after controlling the battery management controller BMS to actively detect the insulation detection voltage formed between the fast charging positive electrode and the fast charging negative electrode of the fast charging seat, the insulation detection voltage is compared with the maximum charging requirement voltage of the vehicle end to determine whether the insulation detection voltage is less than the maximum charging requirement voltage of the vehicle end, and a comparison result is generated; wherein the comparison result is: the insulation detection voltage is less than the maximum charging requirement voltage of the vehicle end, or the insulation detection voltage is greater than or equal to the maximum charging requirement voltage of the vehicle end. If the insulation detection voltage is less than the maximum charging requirement voltage of the vehicle end, it means that the charging pile cannot meet the charging needs of the electric vehicle. If the electric vehicle informs the charging pile according to the maximum charging requirement voltage of the vehicle end, the charging pile may start overvoltage protection to prohibit charging, and then execute S103. If the insulation detection voltage is greater than or equal to the maximum charging requirement voltage of the vehicle end, it means that the charging pile can fully charge the electric vehicle, and the maximum charging requirement voltage of the vehicle end is used to complete the charging configuration with the charging pile.

[0060] As an optional embodiment, it is determined whether the insulation detection voltage is received within a third preset time range. The third preset time range starts from the time when the vehicle controller VCU sends a communication message carrying a CHM message reception flag to the battery management controller BMS. The duration can be set arbitrarily, such as 3s, but it does not constitute a restriction. If the insulation detection voltage is received within the third preset time range, the insulation detection voltage is compared with the maximum charging requirement voltage on the vehicle side and a comparison result is generated; wherein, the comparison result is: the insulation detection voltage is less than the maximum charging requirement voltage on the vehicle side, then S103 is executed. Or if the comparison result is: the insulation detection voltage is greater than or equal to the maximum charging requirement voltage on the vehicle side, the maximum charging requirement voltage on the vehicle side is used to complete the charging configuration with the charging pile.

[0061] For example, if the vehicle controller (VCU) receives the insulation detection voltage V1 from the battery management controller (BMS) within 3 seconds, it compares it with the vehicle-side maximum charging requirement voltage (V0). If V1 < V0, it indicates that the charging pile cannot meet the EV's charging needs. If the EV notifies the charging pile of the vehicle-side maximum charging requirement voltage (V0), the charging pile may activate overvoltage protection to prohibit charging, and S103 will be executed. If V1 ≥ V0, it indicates that the maximum output voltage capability of the charging pile is higher than the EV's charging requirement and the charging pile can fully charge the EV. The vehicle-side maximum charging requirement voltage is then used to complete the charging configuration with the charging pile.

[0062] If the insulation detection voltage is not received within the third preset time range, it is directly determined that the maximum output voltage capability of the charging pile is less than the maximum charging voltage required by the vehicle. For example, if the vehicle controller VCU does not receive the insulation detection voltage V1 sent by the battery management controller BMS within 3 seconds, it indicates that the charging pile cannot meet the charging needs of the electric vehicle. If the electric vehicle notifies the charging pile of the maximum charging voltage required by the vehicle, the charging pile may activate overvoltage protection to prohibit charging, and then execute S103.

[0063] S103: If the insulation detection voltage is lower than the maximum charging requirement voltage at the vehicle end, construct the actual charging requirement voltage of the electric vehicle with reference to the insulation detection voltage, so that the actual charging requirement voltage is lower than the insulation detection voltage.

[0064] If the insulation detection voltage is less than the vehicle-side maximum charging requirement voltage, the insulation detection voltage is used as the electric vehicle's maximum charging threshold to establish the electric vehicle's actual charging requirement voltage. For example, if the insulation detection voltage V1 = 750V and the vehicle-side maximum charging requirement voltage = 850V, 750V is used as the electric vehicle's maximum charging threshold to establish the electric vehicle's actual charging requirement voltage. For example, controlling the electric vehicle's actual charging requirement voltage to 750V or below improves the charging success rate by reducing the electric vehicle's charging requirements.

[0065] S104, after the electric vehicle receives the pile-end charging ready message sent by the charging pile, the electric vehicle sends the actual charging requirement voltage to the charging pile, so that the charging pile supplies power according to the actual charging requirement voltage.

[0066] Among them, the electric vehicle receives the pile-end charging readiness message sent by the charging pile: CRMAA message, indicating that the electric vehicle and the charging pile have successfully shaken hands, the charging pile is ready to charge, and the charging configuration will be carried out subsequently. Since the electric vehicle has already learned the maximum output voltage capability of the charging pile before the handshake between the two parties (during the insulation detection of the pile end), and based on this, the actual charging demand voltage of the electric vehicle is constructed, so that the charging demand of the electric vehicle is below the maximum output voltage capability of the charging pile. Since the BCP message sent by the electric vehicle carries the actual charging demand voltage, and the actual charging demand voltage is below the insulation detection voltage, the charging pile will not activate the overvoltage protection after receiving the BCP message, and can smoothly send the CML message and continue the subsequent charging process.

[0067] There are three main types of charging piles on the market: 500V fast charging piles, 750V fast charging piles, and 1000V fast charging piles. Electric vehicles have a corresponding range of voltage levels at the pile end. For example, for electric vehicles on the 400V platform, since the maximum charging voltage required at the vehicle end is lower than 500V, the voltage level range of the pile end required for charging the electric vehicle is (0, 500V], so the three types of fast charging piles mentioned above can be charged. If the maximum charging voltage required at the vehicle end of the electric vehicle is lower than 750V, the voltage level range of the pile end required for charging the electric vehicle is (500V, 750V], it cannot be charged on a 500V fast charging pile, but can be charged on 750V and 1000V fast charging piles. If the maximum charging voltage required at the vehicle end of the electric vehicle is between 750V and 1000V, V, the pile-end voltage level range required for electric vehicle charging is (750V, 1000V]. It cannot be charged at a 500V fast charging pile, may not be charged at a 750V fast charging pile, or may be charged but not fully charged, and can be fully charged at a 1000V fast charging pile. Due to the large variety of 750V fast charging piles on the market. When some 750V fast charging piles receive a maximum charging demand voltage higher than 750V sent by the electric vehicle, they may have a voltage protection strategy to prohibit charging; some 750V fast charging piles are not very strict in the voltage protection strategy, and can be charged.

[0068] On this basis, as an optional embodiment, according to the CML message sent by the charging pile, the maximum output voltage of the pile end is extracted to determine whether the maximum output voltage of the pile end is lower than the lower limit voltage of the pile end voltage level range required for charging the electric vehicle. If not, execute the subsequent charging process. If so, send a prompt message to replace the high-voltage charging pile. For example, if the pile end voltage level range required for charging an electric vehicle is (750V, 1000V], the maximum output voltage of the pile end in the CML message sent by the charging pile is ≤530V, then it means that the charging pile is 500V specification and cannot charge the electric vehicle. The vehicle controller VCU actively ends the charging process and sends a prompt message to replace the high-voltage charging pile. The instrument prompts "The charging pile voltage is low, please change to a 750V or above charging pile for charging."

[0069] The above is an introduction to the implementation principle of the method for detecting the output voltage of the charging pile. Figure 4 , is an interactive flow chart for an electric vehicle with a maximum charging voltage of 850V and a 1000V fast charging pile. At this point, the charging pile can meet the electric vehicle's maximum charging voltage of 850V and can complete the handshake, charging and other stages at 850V. Figure 5, is an interactive flow chart of an electric car with 850V and a charging pile with 750V fast charging pile. Since the charging pile does not meet the maximum charging demand of the electric car, the maximum voltage output capacity of the charging pile is obtained in advance before the handshake between the two parties is successful, and the actual charging demand voltage is adaptively constructed according to the maximum voltage output capacity of the charging pile, which is the output of the adapted charging pile to ensure the charging success rate. Through the solution provided by the present invention, it can be guaranteed that electric vehicles can be charged on a 750V fast charging pile, can be fully charged on a 1000V fast charging pile, and can remind users when encountering a 500V fast charging pile. This solution has good charging compatibility and gives users a better charging experience.

[0070] In the second aspect, based on the same inventive concept as the method for detecting the output voltage of a charging pile provided in the embodiment of the first aspect, the embodiment of this specification also provides a system for detecting the output voltage of a charging pile, see Figure 6 , the system comprising:

[0071] The first sending unit 601 is used to send an insulation detection message to the charging pile when the fast charging seat of the electric vehicle is connected to the charging pile plug, so as to trigger the charging pile to perform a pile end insulation test;

[0072] The control unit 602 controls the battery management controller to actively detect the insulation detection voltage formed between the fast charging positive electrode and the fast charging negative electrode of the fast charging seat during the process of the charging pile performing the pile end insulation detection. The battery management controller is connected to the fast charging positive electrode and the fast charging negative electrode of the fast charging seat respectively. The insulation detection voltage is used to indicate the maximum output voltage capability of the charging pile.

[0073] A construction unit 603 is configured to construct an actual charging requirement voltage of the electric vehicle with reference to the insulation detection voltage if the insulation detection voltage is less than the vehicle-side maximum charging requirement voltage, so that the actual charging requirement voltage is below the insulation detection voltage;

[0074] The second sending unit 604 is configured to send the actual charging requirement voltage to the charging pile after the electric vehicle receives the pile-end charging ready message sent by the charging pile, so that the charging pile supplies power according to the actual charging requirement voltage.

[0075] It should be noted that the system for detecting the output voltage of a charging pile provided in the embodiments of this specification, wherein the specific manner in which each module performs operations has been described in detail in the method embodiment provided in the above-mentioned first aspect, the specific implementation process can refer to the method embodiment provided in the above-mentioned first aspect, and will not be elaborated here.

[0076] In the third aspect, based on the same inventive concept as the method for detecting the output voltage of a charging pile provided in the embodiment of the first aspect mentioned above, an embodiment of the present invention further discloses a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0077] In the fourth aspect, based on the same inventive concept as the method for detecting the output voltage of a charging pile provided in the embodiment of the first aspect mentioned above, an embodiment of the present invention also discloses an electric vehicle, comprising a memory, a vehicle controller, and a computer program stored in the memory and executable on the vehicle controller, wherein the vehicle controller implements the steps of any of the aforementioned methods when executing the program.

[0078] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0079] The present invention provides a method, system, medium and electric vehicle for detecting the output voltage of a charging pile. During the process of the charging pile performing the pile end insulation detection, the battery management controller is controlled to actively detect the insulation detection voltage formed between the fast charging positive electrode and the fast charging negative electrode of the fast charging seat, so that the voltage output capability of the pile end can be known in advance before the charging pile actively informs the voltage output capability, thereby adjusting the actual charging requirement voltage of the electric vehicle according to the voltage output capability of the pile end, thereby improving the charging success rate.

[0080] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0081] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A method for detecting the output voltage of a charging pile, characterized in that: The method comprises: When the electric vehicle's fast charging station is connected to the charging pile plug, an insulation detection message is sent to the charging pile to trigger the charging pile to perform a pile end insulation test; During the process of the charging pile performing the pile end insulation detection, the battery management controller is controlled to actively detect the insulation detection voltage formed between the fast charging positive electrode and the fast charging negative electrode of the fast charging seat; wherein the battery management controller is respectively connected to the fast charging positive electrode and the fast charging negative electrode of the fast charging seat; the insulation detection voltage is used to represent the maximum output voltage capability of the charging pile; If the insulation detection voltage is lower than the maximum charging requirement voltage at the vehicle end, constructing the actual charging requirement voltage of the electric vehicle with reference to the insulation detection voltage so that the actual charging requirement voltage is lower than the insulation detection voltage; After the electric vehicle receives the pile-end charging ready message sent by the charging pile, the electric vehicle sends the actual charging requirement voltage to the charging pile, so that the charging pile supplies power according to the actual charging requirement voltage.

2. The method according to claim 1, wherein After sending the insulation detection message to the charging pile, the method further includes: If the result message sent by the charging pile after performing the pile-end insulation test is not received within the first preset time range, the maximum charging requirement voltage of the vehicle end is controlled to be reduced to the insulation test voltage, and a prompt message to plug the gun again is sent; Wherein, within a second preset time range, the vehicle-end maximum charging requirement voltage is maintained at the insulation detection voltage.

3. The method according to claim 2, wherein After sending the prompt message for re-insertion of the gun, the method further includes: When the fast charging seat of the electric vehicle and the charging pile are plugged in and connected again, a handshake message carrying the insulation detection voltage is sent to the charging pile to complete the handshake and charging.

4. The method according to claim 1, wherein After controlling the battery management controller to actively detect the insulation detection voltage formed between the fast charging positive electrode and the fast charging negative electrode of the fast charging seat, the method further includes: determining whether the insulation detection voltage is received within a third preset time range; If the insulation detection voltage is received within the third preset time range, comparing the insulation detection voltage with the vehicle-side maximum charging requirement voltage and generating a comparison result; wherein the comparison result is: the insulation detection voltage is less than the vehicle-side maximum charging requirement voltage, or the insulation detection voltage is greater than or equal to the vehicle-side maximum charging requirement voltage; If the insulation detection voltage is not received within the third preset time range, it is directly determined that the maximum output voltage capability of the charging pile is less than the maximum charging requirement voltage of the vehicle end.

5. The method according to claim 1 or 4, wherein: After controlling the battery management controller to actively detect the insulation detection voltage formed between the fast charging positive electrode and the fast charging negative electrode of the fast charging seat, the method further includes: If the insulation detection voltage is greater than or equal to the vehicle-side maximum charging requirement voltage, the vehicle-side maximum charging requirement voltage is used to complete the charging configuration with the charging pile.

6. The method according to claim 1, wherein After sending the actual charging requirement voltage to the charging pile, the method further includes: According to the maximum output voltage of the charging pile sent by the charging pile, determining whether the maximum output voltage of the charging pile is lower than the lower limit voltage of the range of the voltage level of the charging pile required for charging the electric vehicle; If so, a reminder message is sent to replace the charging pile with a higher voltage level.

7. The method according to claim 1, wherein The fast charging positive electrode and the fast charging negative electrode of the fast charging seat are respectively connected to the power battery to form a charging circuit; one end detected by the battery management controller is connected between the power battery and the fast charging positive electrode, and the other end detected by the battery management controller is connected between the power battery and the fast charging negative electrode.

8. A system for detecting the output voltage of a charging pile, characterized in that: The system comprises: The first sending unit is used to send an insulation detection message to the charging pile when the fast charging seat of the electric vehicle is connected to the charging pile plug, so as to trigger the charging pile to perform a pile end insulation test; The control unit controls the battery management controller to actively detect the insulation detection voltage formed between the fast-charging positive electrode and the fast-charging negative electrode of the fast-charging seat during the process of the charging pile performing the pile-end insulation detection. The battery management controller is connected to the fast-charging positive electrode and the fast-charging negative electrode of the fast-charging seat respectively. The insulation detection voltage is used to represent the maximum output voltage capability of the charging pile. a construction unit, configured to construct an actual charging requirement voltage of the electric vehicle with reference to the insulation detection voltage if the insulation detection voltage is less than the vehicle-end maximum charging requirement voltage, so that the actual charging requirement voltage is below the insulation detection voltage; The second sending unit is used to send the actual charging requirement voltage to the charging pile after the electric vehicle receives the pile end charging ready message sent by the charging pile, so that the charging pile supplies power according to the actual charging requirement voltage.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. An electric vehicle comprising a memory, a vehicle controller, and a computer program stored in the memory and operable on the vehicle controller, characterized in that: When the vehicle controller executes the program, the steps of the method according to any one of claims 1 to 7 are implemented.

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