Vehicle charging insulation detection method and apparatus, charging pile, device and medium

Abstract

A vehicle charging insulation detection method and apparatus, a charging pile, a device and a medium. The method comprises: when it is detected that a vehicle is charged by using at least two charging guns, using an insulation detection apparatus corresponding to one of the at least two charging guns to perform charging insulation detection.

Description

Methods, devices, charging piles, equipment and media for vehicle charging insulation testing

[0001] This application claims priority to Chinese patent application No. 202411555395.1, filed on October 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of vehicle technology, and in particular to a method, apparatus, charging pile, equipment and medium for vehicle charging insulation testing. Background Technology

[0003] As the electric vehicle market demands higher charging power, some automakers have introduced dual-gun charging solutions to meet customer charging needs, which involves using two charging guns to charge the vehicle.

[0004] In practical applications, there are two methods: the vehicle is responsible for insulation detection during the charging process, and the charging pile is responsible for insulation detection during the charging process. Each charging gun circuit is equipped with an Insulation Monitoring Device (IMD). When two guns are connected to the same vehicle, the two IMDs will work simultaneously in the same charging circuit. Summary of the Invention

[0005] On the one hand, a method for detecting the charging insulation of a vehicle is provided. The method includes:

[0006] If it is detected that the vehicle is being charged using at least two charging guns, an insulation detection device corresponding to one of the at least two charging guns is used to perform charging insulation detection.

[0007] In some embodiments, the step of performing the charging insulation detection using an insulation detection device corresponding to one of the at least two charging guns includes:

[0008] A target insulation detection device is determined from the insulation detection devices corresponding to the at least two charging guns, and the charging insulation detection is performed using the target insulation detection device.

[0009] In some embodiments, determining a target insulation detection device corresponding to one charging gun from the insulation detection devices corresponding to the at least two charging guns includes:

[0010] Based on the time sequence of each of the at least two charging guns, a target insulation detection device corresponding to one of the insulation detection devices corresponding to the at least two charging guns is determined.

[0011] In some embodiments, the method further includes:

[0012] If it is detected that both charging guns have stopped charging, the charging insulation detection using the target insulation detection device shall be stopped.

[0013] In some embodiments, the method further includes:

[0014] If it is detected that one of the at least two charging guns has stopped charging, and the charging gun that has stopped charging is the charging gun corresponding to the target insulation detection device, the charging insulation detection shall be switched to the insulation detection device corresponding to the other of the at least two charging guns.

[0015] In some embodiments, the method further includes:

[0016] If it is detected that one of the at least two charging guns has stopped charging, and the charging gun that has stopped charging is not the charging gun corresponding to the target insulation detection device, the charging insulation detection shall continue to be performed using the target insulation detection device.

[0017] In some embodiments, the step of performing the charging insulation detection using an insulation detection device corresponding to one of the at least two charging guns includes:

[0018] In the Nth detection cycle, the insulation detection is performed using the insulation detection device corresponding to one of the at least two charging guns, and in the N+1th detection cycle, the insulation detection is performed using the insulation detection device corresponding to the other of the at least two charging guns.

[0019] Where N is a positive integer greater than or equal to 1.

[0020] In some embodiments, the method further includes:

[0021] Before performing the charging insulation test using the insulation detection device corresponding to one of the at least two charging guns.

[0022] Obtain the vehicle identifier sent by the vehicle-side communication controller corresponding to the at least two charging guns;

[0023] If the vehicle identifiers sent by the vehicle-side communication controllers corresponding to the at least two charging guns are the same, it is determined that the vehicle is being charged using the at least two charging guns.

[0024] In some embodiments, obtaining the vehicle identifier sent by the vehicle-side communication controller corresponding to the at least two charging guns includes: obtaining the vehicle identifier sent by the vehicle-side communication controller corresponding to the at least two charging guns based on value-added services.

[0025] In some embodiments, the method further includes:

[0026] Before performing the charging insulation test using the insulation detection device corresponding to one of the at least two charging guns.

[0027] The insulation resistance is obtained by performing charging insulation testing using the insulation detection devices corresponding to the at least two charging guns.

[0028] If the insulation resistance is within the first preset resistance range, it is determined that the vehicle is charged using the at least two charging guns.

[0029] In some embodiments, determining that the vehicle is charged using the at least two charging guns when the insulation resistance is within the first preset resistance range includes:

[0030] If the insulation resistance detected in multiple detection cycles is within the range of the first preset resistance value, it is determined that the vehicle is charged using the at least two charging guns.

[0031] In some embodiments, the insulation detection device includes a detection circuit and a preset resistor connected in parallel with the detection circuit. The preset resistor is connected to the detection circuit via a second contactor. The step of performing the charging insulation detection using the insulation detection devices corresponding to the at least two charging guns to obtain the insulation resistance includes:

[0032] During the charging insulation detection process using the insulation detection devices corresponding to the at least two charging guns, the closing of the second contactor is controlled within a detection cycle to connect the preset resistor to the detection circuit, thereby obtaining the insulation resistance within the current detection cycle.

[0033] In some embodiments, the detection circuit includes a first resistor, a first contactor, and a second resistor.

[0034] The first resistor is connected between the negative terminal of the power supply and the ground terminal.

[0035] The first contactor is connected to the first resistor and is configured to control the connection of the first resistor.

[0036] The second resistor is connected between the negative terminal of the power supply and the ground terminal.

[0037] The preset resistor and the second resistor are connected in parallel.

[0038] On the other hand, a device for detecting vehicle charging insulation is provided. The device is configured to:

[0039] If it is detected that the vehicle is being charged using at least two charging guns, an insulation detection device corresponding to one of the at least two charging guns is used to perform charging insulation detection.

[0040] On the other hand, a charging station is provided. The charging station includes the vehicle charging insulation detection device described above.

[0041] In another aspect, an electronic device is provided. This electronic device includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements the method described above.

[0042] In another aspect, a computer-readable storage medium is provided. A computer program is stored on the computer-readable storage medium, which, when executed by a processor, implements the method described above.

[0043] Some embodiments of this disclosure have the following advantages:

[0044] In some embodiments of this disclosure, when it is detected that the vehicle is being charged with at least two charging guns, an insulation detection device corresponding to one of the at least two charging guns is used to perform charging insulation detection. This achieves the use of a single insulation detection device to perform charging insulation detection when at least two charging guns are charging. The single insulation detection device is responsible for the insulation detection of at least two charging gun circuits, avoiding interference between the simultaneous use of at least two insulation detection devices and thus affecting the insulation detection results. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of this disclosure, the accompanying drawings used in the description of this disclosure will be briefly introduced below. However, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 is a flowchart of a method for vehicle charging insulation detection provided in some embodiments of this disclosure;

[0047] Figure 2 is a schematic diagram of a system architecture provided by some embodiments of this disclosure;

[0048] Figure 3 is a schematic diagram of another system architecture provided by some embodiments of this disclosure;

[0049] Figure 4 is a schematic diagram of another system architecture provided by some embodiments of this disclosure;

[0050] Figure 5 is a schematic diagram of a detection circuit provided in some embodiments of this disclosure;

[0051] Figure 6 is a schematic diagram of another detection circuit provided in some embodiments of this disclosure. Detailed Implementation

[0052] To make the above-mentioned objects, features, and advantages of this disclosure more apparent and understandable, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments. However, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0053] In related technologies, to address the problem of mutual interference when two insulation monitoring devices (IMDs) work together, which affects the insulation testing results, a cross-detection method can be adopted, in which the two IMDs are started in turn to ensure that only one IMD is working at any given time.

[0054] In one implementation, communication is established between the two IMDs, and they coordinate by sending status messages to each other to achieve the purpose of taking turns starting up. However, for dual-gun charging, establishing additional communication will increase the hardware and software costs of the charging pile, and it is only applicable to dual-gun piles. It is difficult to establish communication between the IMDs of the piles, and it cannot cover the charging scenario of "one vehicle, two piles".

[0055] In another implementation, the IMD program is modified so that each IMD, upon waking, first performs low-frequency square wave reception detection. If a low-frequency square wave is received, it indicates the presence and operation of another IMD within the circuit. This IMD then enters the alternating detection logic and injects a square wave consistent with its received waveform into the circuit. When the other IMD detects the superimposed waveform, it also switches to the alternating detection logic. Both IMDs are set to the same detection period, thus avoiding mutual interference. However, this implementation also requires modification of the program for each IMD. Furthermore, given the variety of insulation detection methods available on the market, this solution is only applicable to low-frequency signal detection methods and has certain limitations.

[0056] In some embodiments of this disclosure, the Vehicle Identification Number (VIN) of the vehicle is interacted with through Value Added Service (VAS) to identify the VIN and determine whether a vehicle is using dual-gun charging, which can accurately cover charging scenarios of "one vehicle, one charging pile" and "one vehicle, two charging piles".

[0057] Furthermore, through single IMD detection, after the charging backend identifies a vehicle charging with dual guns, it controls the corresponding charging pile to activate only one IMD based on the order of VIN reception. Since both gun circuits are connected to the same vehicle-side charging circuit during dual-gun charging, a single IMD can complete the insulation detection function for the entire circuit. Compared to the cross-detection method, which involves various insulation detection methods used in the charging pile market, such as the commonly used bridge method and low-frequency signal injection method, each requires specialized software or hardware modifications to the IMD module to identify and perform cross-detection of dual-gun vehicles, making it more complex, the single IMD detection method is applicable to all insulation detection mechanisms without requiring modification to the IMD.

[0058] In addition, some embodiments of this disclosure alternately close the contactors to stagger the insulation detection cycle, thereby avoiding false alarms of insulation detection faults and termination of the charging process, effectively improving the stability of dual-gun charging.

[0059] The following description, in conjunction with the accompanying drawings, illustrates some embodiments of this disclosure:

[0060] Referring to Figure 1, Figure 1 shows a flowchart of a method for vehicle charging insulation detection provided by some embodiments of the present disclosure. This method can be applied to the charging pile end, such as the charging pile or the charging pile backend, that is, in scenarios where the charging pile is responsible for insulation detection during the charging process, such as European and American standard dual-gun DC charging.

[0061] In some examples, the vehicle is a vehicle equipped with one battery unit, or the vehicle is a vehicle equipped with multiple battery units having a common anode and a common cathode.

[0062] The method may include the following steps:

[0063] In step 101, if it is detected that the vehicle is being charged using at least two charging guns, an insulation detection device corresponding to one of the at least two charging guns is used to perform charging insulation detection.

[0064] In practical applications, each charging station can be equipped with at least two charging guns. Each charging gun's corresponding charging gun circuit has an independent IMD (Insulation Design Device). When the same vehicle is charged using at least two charging guns (including charging using at least two charging guns from the same charging station or charging using at least two charging guns from at least two charging stations), the charging circuits of at least two charging guns are connected to the same vehicle-side charging circuit. In this case, a single IMD can be used to complete the insulation detection function of the entire circuit, avoiding the problem of mutual interference caused by using multiple IMDs simultaneously.

[0065] For a method that uses one IMD to perform insulation testing of the entire circuit, two insulation testing strategies can be included: activating only one IMD for charging insulation testing, and alternating between using one of at least two IMDs for charging insulation testing (i.e., using only one of at least two IMDs in the same testing cycle).

[0066] The following explains these two insulation testing strategies:

[0067] The first insulation detection strategy (i.e., only one IMD is activated for charging insulation detection) is described below:

[0068] In some embodiments, the step of performing charging insulation detection using an insulation detection device corresponding to one of the at least two charging guns includes:

[0069] A target insulation detection device is determined from the insulation detection devices corresponding to the at least two charging guns, and the charging insulation detection is performed using the target insulation detection device.

[0070] For cases where only one IMD is activated for charging insulation detection, one of at least two IMDs can be selected as the target IMD. During the charging process, only the target IMD is activated for charging insulation detection.

[0071] In some embodiments of this disclosure, a single IMD detection method is used, where only one IMD is activated to simultaneously handle the insulation detection of at least two charging gun circuits. This avoids the problem of inaccurate detection results caused by mutual interference when multiple IMD modules are connected to the same vehicle circuit.

[0072] Compared to the cross-detection method, the insulation detection methods used in the charging pile market are diverse, such as the conventional bridge method and the low-frequency signal injection method. These methods require special software or hardware modifications to their IMD modules to identify dual-gun vehicles and perform cross-detection, which is quite complex. However, the single IMD detection method in some embodiments of this disclosure is applicable to all insulation detection mechanisms and does not require modification of the IMD software or hardware logic itself. It can be completed through the collaboration of the charging backend and the charging pile.

[0073] In some embodiments, determining a target insulation detection device corresponding to one charging gun from the insulation detection devices corresponding to the at least two charging guns includes:

[0074] Based on the time sequence corresponding to each charging gun, a target insulation detection device corresponding to one of the insulation detection devices corresponding to the at least two charging guns is determined.

[0075] When selecting a target IMD, the time sequence of each charging gun connected to the vehicle can be determined. Then, based on this time sequence, one IMD corresponding to at least two charging guns can be selected as the target IMD. For example, the IMD of the charging gun that appears first in the sequence can be used as the target IDM.

[0076] In some examples, the time sequence corresponding to each charging gun can be either the time sequence in which the vehicle identifier is obtained through VAS, or the time sequence in which each charging gun is connected to the vehicle.

[0077] In some embodiments, the method further includes: stopping charging insulation detection using the target insulation detection device when it is detected that both of the at least two charging guns have stopped charging.

[0078] In some embodiments, the method further includes: when it is detected that one of the at least two charging guns has stopped charging and the charging gun that has stopped charging is the charging gun corresponding to the target insulation detection device, switching to use the insulation detection device corresponding to the other of the at least two charging guns for charging insulation detection.

[0079] In some embodiments, the method further includes: if it is detected that one of the at least two charging guns has stopped charging and the charging gun that has stopped charging is not the charging gun corresponding to the target insulation detection device, then continue to use the target insulation detection device for charging insulation detection.

[0080] In practical applications, if at least two charging gun circuits stop charging simultaneously or sequentially, the charging pile's controller performs corresponding logic processing based on the charging stop status, as follows:

[0081] If at least two charging guns stop charging simultaneously (i.e., at least two charging guns are detected to have stopped charging), the charging pile controller can directly stop IMD detection.

[0082] If at least two charging guns stop charging successively, and the circuit in which the IMD is working stops first (i.e., it is detected that one of the at least two charging guns has stopped charging, and the charging gun that has stopped charging is the charging gun corresponding to the target insulation detection device), then the controller of the charging pile stops the target IMD, ends the charging of this circuit, starts the IMD of another circuit, and keeps the single gun charging.

[0083] If at least two charging guns stop charging sequentially, and the circuit where the IMD is not in operation stops first (it is detected that one of the at least two charging guns has stopped charging, and the charging gun that stopped charging is not the charging gun corresponding to the target insulation detection device), then the controller of the charging pile keeps the IMD of this circuit in operation (i.e. keeps the target IMD in operation).

[0084] The second insulation detection strategy (i.e., alternating between at least one of two IMDs for charging insulation detection) is described below:

[0085] In some embodiments, the step of performing charging insulation detection using an insulation detection device corresponding to one of the at least two charging guns includes:

[0086] In the Nth detection cycle, the insulation detection device corresponding to one of the at least two charging guns is used to perform charging insulation detection, and in the N+1th detection cycle, the insulation detection device corresponding to the other of the at least two charging guns is used to perform charging insulation detection.

[0087] N is a positive integer greater than or equal to 1.

[0088] For situations where one of the two IMDs is used alternately for charging insulation detection, different detection cycles can be set by staggering the detection switch closing cycles. Different IMDs can be used for charging insulation detection in different detection cycles to ensure the effectiveness of insulation detection during charging.

[0089] In some embodiments of this disclosure, by staggering the detection cycles when charging the same vehicle using two charging piles of the same brand, the situation of terminating the charging process due to false insulation detection faults can be avoided, effectively improving the stability of dual-gun charging.

[0090] The above describes two schemes for completing the insulation detection function of the entire circuit using a single IMD, but it should be understood that this disclosure is not limited to these two schemes.

[0091] To determine whether a vehicle is being charged using at least two charging guns—that is, whether it's using a single charging gun or two or more—there are two strategies: either using the vehicle identifier transmitted via a value-added service (VAS), or determining the insulation resistance. In some examples, priorities can be set, and the strategy selected based on these priorities. For instance, first determine if the vehicle identifier can be transmitted via VAS. If it can, then the vehicle identifier is used to determine whether at least two charging guns are being used. If it cannot be transmitted via VAS, then the insulation resistance is measured to determine whether at least two charging guns are being used.

[0092] The following explains these two judgment strategies:

[0093] The first judgment strategy (i.e., using vehicle identification to determine whether a vehicle is being charged using at least two charging guns) is described below:

[0094] In some embodiments, before performing charging insulation testing using the insulation detection device corresponding to one of the at least two charging guns, the method further includes:

[0095] Obtain the vehicle identifier sent by the vehicle-side communication controller corresponding to the at least two charging guns; if the vehicle identifiers sent by the vehicle-side communication controllers corresponding to the at least two charging guns are the same, determine that the vehicle is being charged using the at least two charging guns.

[0096] In some examples, the vehicle identifier can be a VIN.

[0097] In practical applications, the vehicle identifiers sent by the vehicle-side communication controllers corresponding to at least two charging guns connected to the vehicle can be obtained. Then, it can be determined whether the vehicle identifiers are the same. If the vehicle identifiers are the same, it is determined that the vehicle is being charged using at least two charging guns. If the vehicle identifiers are different, it is determined that the vehicle is being charged using a single charging gun.

[0098] In some embodiments, obtaining the vehicle identifier sent by the vehicle-side communication controller corresponding to the at least two charging guns includes: obtaining the vehicle identifier sent by the vehicle-side communication controller corresponding to the at least two charging guns based on value-added services.

[0099] In some examples, the vehicle-side communication controllers corresponding to at least two charging guns can send VINs to the charging pile-side communication controllers corresponding to at least two charging guns based on value-added services. The charging pile-side communication controllers can then send VINs to the charging pile backend through the value-added services.

[0100] Value-added services (VAS) refer to service types developed and operated in mobile communication networks that are in addition to the basic services, aiming to provide users with a richer and more diversified communication experience.

[0101] In some examples, to ensure the secure, accurate, and efficient transmission of VINs, the process of interaction between the vehicle, charging station, and charging station backend using value-added services may include: 1. The initiating end sends a charging request: such as initiating a charging request through the vehicle's onboard system. 2. Data transmission: The request information is transmitted to the receiving end via wireless communication technology. 3. Authentication and authorization: The receiving end authenticates the identity and confirms the user's identity and permissions. Based on the identity and permissions, the system confirms whether the user is authorized to use the charging station. 4. Obtaining the vehicle's VIN: The onboard system obtains the vehicle's VIN from the vehicle's Electronic Control Unit (ECU). 5. VIN transmission: The onboard system transmits the obtained VIN to the receiving end via wireless communication technology (such as Wi-Fi, Bluetooth, 4G, or 5G networks). 6. VIN verification and processing: After receiving the VIN, the receiving end verifies its legality and validity, such as by comparing it with the vehicle manufacturer's database to confirm the VIN's correctness. If the VIN verification is successful, the receiving end associates the VIN with the user's account information for subsequent charging management and settlement.

[0102] In scenarios where the charging pile is responsible for insulation detection during charging, such as dual-gun DC charging according to European and American standards, the vehicle-to-pile interaction does not involve the transmission of the vehicle's VIN in the corresponding charging protocol standard (such as ISO15118-2). Therefore, the value-added service VAS can be used uniformly in the vehicle, the charging pile, and the backend to realize the interaction of the vehicle's VIN during charging through encryption.

[0103] As shown in Figure 2, the operation of the charging station is managed by the charging backend, which controls all charging piles under the station. The piles and the backend continuously exchange information, such as through the Open Charge Point Protocol (OCPP). Each charging pile has a built-in pile controller and can be equipped with at least two charging guns. Each charging gun circuit has an independent IMD and a Supply Equipment Communication Controller (SECC). For each vehicle, there is a vehicle controller, and each charging interface circuit is also equipped with an independent Electric Vehicle Communication Controller (EVCC). For example, the SECC and EVCC can interact using the ISO 15118-2 standard. In some embodiments of this disclosure, a VAS is added to enable the uploading of vehicle VIN information.

[0104] In some embodiments of this disclosure, the VIN of a vehicle is uploaded by applying the VAS function. When the charging pile or the backend recognizes at least two identical VINs, it is determined that the vehicle is being charged by at least two charging guns. This allows for direct identification of the vehicle VIN without the need for complex detection, making it relatively simple.

[0105] As shown in Figures 3 and 4, the charging backend is connected to at least two charging piles, such as charging pile #1 and charging pile #2. Each charging pile has a pile controller and is equipped with at least two charging guns, such as charging gun #1 and charging gun #2. Each charging gun is equipped with an IMD and a SECC, which are connected to the pile controller. For the vehicle, at least two charging ports are provided, such as charging port #1 and charging port #2, and each charging port is equipped with a corresponding EVCC, which is connected to the vehicle controller.

[0106] In the case of dual-gun charging, there are two scenarios: "one vehicle, one charging station" and "one vehicle, two charging stations". These scenarios involve the simultaneous or sequential start-up and simultaneous or sequential stop of the two charging circuits, as follows:

[0107] In the "one vehicle, one charging station" scenario, as shown in Figure 3, the processing procedure is as follows:

[0108] 1. The two charging guns of charging pile 1 are connected to vehicle 1 equipped with dual charging ports simultaneously or sequentially.

[0109] 2. The two SECCs of charging pile 1 start communicating with the two EVCCs corresponding to vehicle 1 simultaneously or sequentially.

[0110] 3. The two EVCCs of vehicle 1 are electric vehicle charging communication controllers, which simultaneously or sequentially send the VIN of vehicle 1 to the corresponding SECC of charging pile 1 through VAS.

[0111] 4. The two SECCs of charging pile 1 transmit the received VIN information to the controller of charging pile 1 simultaneously or sequentially, and charging pile 1 synchronously uploads the information to the charging backend.

[0112] 5. When the controller of charging pile 1 detects two identical VINs at the same time, it determines that the two SECCs are communicating with the same vehicle.

[0113] 6. The controller of charging pile 1 starts or maintains the insulation detection of the IMD corresponding to the first circuit according to the order of VIN reception. The IMD of the circuit that receives VIN later does not start, and dual-gun charging proceeds normally.

[0114] In some examples, when two charging gun circuits stop charging simultaneously or sequentially, the controller of charging pile 1 performs corresponding logic processing based on the charging stop situation, as follows: If both charging gun circuits stop charging simultaneously, the controller of charging pile 1 directly stops IMD detection. If the two charging gun circuits stop charging sequentially, and the circuit where the IMD is active stops first, the controller of charging pile 1 stops this IMD and ends charging for this circuit, starts the IMD of the other circuit, and maintains single-gun charging. If the two charging gun circuits stop charging sequentially, and the circuit where the non-IMD is active stops first, the controller of charging pile 1 keeps the IMD of this circuit active.

[0115] In the scenario of "one vehicle, two charging stations", as shown in Figure 4, the processing procedure is as follows:

[0116] 1. Two of the charging guns of charging pile 1 and charging pile 2 are connected to vehicle 1, which is equipped with dual charging ports, simultaneously or sequentially.

[0117] 2. The two SECCs of charging pile 1 and charging pile 2 start communication with the two EVCCs corresponding to vehicle 1 simultaneously or sequentially.

[0118] 3. The two EVCCs of vehicle 1 simultaneously or sequentially send the VIN of vehicle 1 to the corresponding SECCs of charging pile 1 and charging pile 2 via VAS respectively.

[0119] 4. The two SECCs of charging pile 1 and charging pile 2 simultaneously or sequentially transmit the received VIN to the controllers of charging pile 1 and charging pile 2, and charging pile 1 and charging pile 2 synchronously upload the information to the charging backend.

[0120] 5. When the charging backend detects two identical VINs at the same time, it determines that at least two charging gun circuits of the two charging piles are communicating with the same vehicle.

[0121] 6. Based on the order of VIN reception, the charging backend sends instructions to the two corresponding charging piles, instructing their pile controllers to start or maintain the insulation detection of the IMD corresponding to the first charging gun circuit. The IMD of the subsequent VIN circuit does not start, and dual-gun charging proceeds normally.

[0122] In some examples, two charging gun circuits stop charging simultaneously or sequentially. The charging backend issues instructions based on the charging stop condition to instruct the charging pile to perform corresponding logical processing, as follows: If both charging gun circuits stop charging simultaneously, the charging backend instructs the pile controller currently performing insulation testing to directly stop the IMD (Insulation Device) of that charging circuit. If both charging gun circuits stop charging sequentially, and the circuit with the IMD in operation stops first, the charging backend instructs the corresponding charging pile controller to stop the IMD of that charging circuit and end charging for that circuit, while the other pile controller starts the IMD of the corresponding circuit and maintains charging. If both charging gun circuits stop charging sequentially, and the circuit without the IMD in operation stops first, the charging backend instructs the corresponding charging pile controller to keep the IMD of that circuit operational.

[0123] The second judgment strategy is described below (determining whether a vehicle is using at least two charging guns by detecting the value of the insulation resistance):

[0124] In some embodiments, before performing charging insulation testing using the insulation detection device corresponding to one of the at least two charging guns, the method further includes:

[0125] The insulation resistance is obtained by using the insulation detection device corresponding to the at least two charging guns to perform charging insulation detection; if the insulation resistance is within the first preset resistance range, it is determined that the vehicle is being charged by the at least two charging guns.

[0126] In practical applications, when using insulation detection devices corresponding to at least two charging guns to perform charging insulation detection, there are multiple detection circuits and the resistors in each detection circuit are connected in parallel. This results in the overall insulation resistance being different from the insulation resistance when using an insulation detection device corresponding to a single charging gun. Therefore, if the detected insulation resistance is within the first preset resistance range, it can be determined that the vehicle is being charged using at least two charging guns.

[0127] The first preset resistance range is the range of resistance values ​​obtained when performing charging insulation testing using insulation testing devices corresponding to at least two charging guns.

[0128] In some embodiments, determining that the vehicle is charged using the at least two charging guns when the insulation resistance is within a first preset resistance range includes:

[0129] If the insulation resistance detected in multiple detection cycles is within the range of a first preset resistance value, it is determined that the vehicle is charged using the at least two charging guns.

[0130] In practical applications, the insulation resistance can be obtained within multiple detection cycles. Then, it can be determined whether the insulation resistance detected within multiple detection cycles is within the first preset resistance value range. If the insulation resistance detected within multiple detection cycles is within the first preset resistance value range, it can be determined that the vehicle uses at least two charging guns for charging, thus ensuring the accuracy of the judgment.

[0131] In some embodiments, the insulation detection device includes a detection circuit and a preset resistor connected in parallel with the detection circuit, the preset resistor being connected to the detection circuit via a second contactor.

[0132] In some examples, the detection circuit includes a first resistor, a first contactor, and a second resistor.

[0133] The first resistor is connected between the negative terminal of the power supply and the ground terminal. A first contactor is connected to the first resistor and configured to control the connection of the first resistor. The second resistor is connected between the negative terminal of the power supply and the ground terminal.

[0134] The preset resistor and the second resistor are connected in parallel.

[0135] As shown in Figures 5 and 6, the preset resistor is Rd, the second contactor is K2, the first resistor is R1, the second resistor is R in Figure 5, and the second resistor R in Figure 5 is the equivalent resistance of any one or more of the resistors R2, R3, and R4 in Figure 6. The preset resistor Rd is connected in parallel with the second resistor R. For example, the preset resistor Rd can be connected in parallel with any one or more of the resistors R2, R3, and R4, as shown in Figure 6 where the preset resistor Rd is connected in parallel with the resistor R3.

[0136] In some embodiments, the step of performing charging insulation detection using the insulation detection devices corresponding to the at least two charging guns to obtain the insulation resistance includes:

[0137] During the charging insulation detection process using the insulation detection devices corresponding to the at least two charging guns, the closing of the second contactor is controlled within a detection cycle to connect the preset resistor to the detection circuit, thereby obtaining the insulation resistance within the current detection cycle.

[0138] In practical applications, a detection cycle is the time range from the closing of the first contactor to the opening of the first contactor. By closing the second contactor within a detection cycle, a preset resistor can be connected to the detection circuit. The preset resistors in the insulation detection devices corresponding to at least two charging guns are connected in parallel, so that the insulation resistance within the current detection cycle is within the first preset range. Therefore, it can be determined that the vehicle is being charged using at least two charging guns.

[0139] As shown in Figure 5, for the detection circuit, the insulation resistance R+ of the DC positive (DC+) circuit to ground and the insulation resistance R- of the DC negative (DC-) circuit to ground can be calculated by alternating opening and closing of the switch using the double-sided insulation method. The smaller value is taken as the insulation resistance of the entire high-voltage circuit. Two different values ​​(U) are obtained by opening and closing the first contactor K1. DC U j断开 ,R) and (U DC U j闭合 R1 / / R) can be obtained by solving a system of equations to find R+ and R-. Here, "R1 / / R" indicates that the first resistor R1 and the second resistor R are connected in parallel.

[0140] The charging cabinet outputs a DC voltage of U. DC The voltage value obtained when the first contactor K1 is open is denoted as u1; the voltage value obtained when the first contactor K1 is closed is denoted as u2. The insulation resistance R+ to ground of the DC positive terminal is equal to RK1 (i.e., R+ = RK1), and the insulation resistance R- to ground of the DC negative terminal is equal to RK2 (i.e., R- = RK2). The insulation monitoring sampling ratio is 100K / (10.9M+11M+100K) = 1 / 220. Therefore, the voltage Uj when the first contactor K1 is open is 220 × u1; the voltage Uj when the first contactor K1 is closed is 220 × u2.

[0141] In some examples, for the case where the first contactor K1 is open, the following equation can be used:

[0142] When the first contactor K1 is conducting, the following equation can be used:

[0143] RK1 and RK2 can be obtained by solving the above system of equations.

[0144] As shown in Figure 6, a preset resistor Rd is connected to the detection circuit via the second contactor K2. The detection circuit is connected in parallel with the second contactor K2 and the preset resistor Rd, which periodically open and close. The charging pile determines whether multiple charging piles are charging the same vehicle by detecting the periodic changes in the resistor. When two charging piles of the same brand are charging the same vehicle, the closing cycle of the detection switch is staggered to ensure the effectiveness of insulation detection during the charging process, avoid false alarms of insulation detection faults and termination of the charging process, and effectively improve the stability of dual-gun charging.

[0145] During the entire charging process, a high-voltage insulation test is performed on the entire charging circuit. The charging pile performs the insulation test through the following steps:

[0146] 1. Close K1 (i.e., the first contactor) at time T1, and open K1 at time T1+A (i.e., one detection cycle is the time range from when K1 is closed to when K1 is opened). Read U1 at time T1 and U2 at time T1+A from the detection circuit.

[0147] 2. Calculate the insulation resistance of DC+ and DC- to ground as R+ and R- (the insulation resistance of DC positive to ground R+ and the insulation resistance of DC negative to ground R-). Take the smaller of R+ and R- as the insulation resistance of the entire charging circuit.

[0148] 3. At time T1+B, close K2 (i.e., the second contactor) to close K2 within a fixed period, so that the preset resistor Rd is connected to the detection circuit. The duration of the interval period must ensure that A > B (i.e., the preset resistor is connected by closing K2 within one detection period, and the insulation resistance is measured).

[0149] 4. Because a fixed value resistor is added, the calculated R+ and R- will fall into a fixed range. This range is temporarily fixed as {R++Rdmax, R+-Rdmin} and {R-+Rdmax, R--Rdmin}.

[0150] 5. When another charging gun of the same brand is tested for insulation, because two preset resistors Rd are added to the entire circuit, R+ and R- will fall into a fixed range. This range is temporarily fixed as {R++Rdmax / 2, R+-Rdmin / 2}, {R-+Rdmax / 2, R--Rdmin / 2} (i.e., the first preset range).

[0151] 6. If the R+ and R- values ​​of the charging pile are stable within {R++Rdmax, R+-Rdmin} and {R-+Rdmax, R--Rdmin} for three consecutive cycles (i.e., multiple detection cycles), it means that the current vehicle is undergoing single-gun charging or dual-gun charging for different vehicles. In this case, the current detection cycle strategy will still be used for judgment.

[0152] 7. If the R+ and R- values ​​of a charging pile are consistently within {R++Rdmax / 2, R+-Rdmin / 2} and {R-+Rdmax / 2, R--Rdmin / 2} for three consecutive cycles, respectively, it is considered a charging pile of the same brand and insulation testing is performed. In this case, the charging management backend needs to switch the testing cycle of the charging cabinet entering the charging process later to T+D (i.e., staggering the testing cycles of two IMDs to form cross-testing), ensuring that D > A. If there is no specific order in the charging process, the charging piles need to be sorted from largest to smallest according to their numbers, and the insulation testing module cycle switching should be performed accordingly.

[0153] In some examples, an insulation resistance greater than 500Ω / V is considered safe; an insulation resistance greater than 100Ω / V but less than 500Ω / V should trigger an alarm; and an insulation resistance less than or equal to 100Ω / V should stop charging and trigger an alarm.

[0154] In some embodiments of this disclosure, when it is detected that the vehicle is being charged with at least two charging guns, an insulation detection device corresponding to one of the at least two charging guns is used to perform charging insulation detection. This achieves the use of a single insulation detection device to perform charging insulation detection when at least two charging guns are charging. The single insulation detection device is responsible for the insulation detection of at least two charging gun circuits, avoiding interference between the simultaneous use of at least two insulation detection devices and thus affecting the insulation detection results.

[0155] It should be noted that, for the sake of simplicity, the method embodiments are all described as a series of actions. However, those skilled in the art should understand that some embodiments of this disclosure are not limited to the described order of actions, because according to some embodiments of this disclosure, certain steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all exemplary embodiments, and the actions involved are not necessarily required by some embodiments of this disclosure.

[0156] Some embodiments of this disclosure also provide a device for detecting vehicle charging insulation. This device is configured to perform charging insulation detection using an insulation detection device corresponding to one of the at least two charging guns when it is detected that the vehicle is being charged with at least two charging guns.

[0157] In some embodiments, the device is configured to:

[0158] A target insulation detection device is determined from the insulation detection devices corresponding to the at least two charging guns, and the charging insulation detection is performed using the target insulation detection device.

[0159] In some embodiments, the device is configured to:

[0160] Based on the time sequence corresponding to each charging gun, a target insulation detection device corresponding to one of the insulation detection devices corresponding to the at least two charging guns is determined.

[0161] In some embodiments, the device is further configured to:

[0162] If it is detected that at least two charging guns have stopped charging, the charging insulation detection using the target insulation detection device shall be stopped.

[0163] In some embodiments, the device is further configured to:

[0164] If it is detected that one of the at least two charging guns has stopped charging and the charging gun that has stopped charging is the charging gun corresponding to the target insulation detection device, the charging insulation detection is switched to the insulation detection device corresponding to the other of the at least two charging guns.

[0165] In some embodiments, the device is further configured to:

[0166] If it is detected that one of the at least two charging guns has stopped charging, and the charging gun that has stopped charging is not the charging gun corresponding to the target insulation detection device, the charging insulation detection shall continue to be performed using the target insulation detection device.

[0167] In some embodiments, the device is further configured to:

[0168] In the Nth detection cycle, the insulation detection device corresponding to one of the at least two charging guns is used to perform charging insulation detection, and in the N+1th detection cycle, the insulation detection device corresponding to the other of the at least two charging guns is used to perform charging insulation detection. N is a positive integer greater than or equal to 1.

[0169] In some embodiments, the device is further configured to: perform charging insulation detection using the insulation detection device corresponding to one of the at least two charging guns, before the charging insulation detection is performed.

[0170] Obtain the vehicle identifier sent by the vehicle-side communication controller corresponding to the at least two charging guns;

[0171] If the vehicle identifiers sent by the vehicle-side communication controllers corresponding to the at least two charging guns are the same, it is determined that the vehicle is being charged using the at least two charging guns.

[0172] In some embodiments, the device is further configured to: obtain vehicle identifiers sent by the vehicle-side communication controllers corresponding to the at least two charging guns based on value-added services.

[0173] In some embodiments, the device is further configured to:

[0174] The insulation resistance is obtained by performing charging insulation testing using the insulation detection devices corresponding to the at least two charging guns.

[0175] If the insulation resistance is within the first preset resistance range, it is determined that the vehicle is charged using the at least two charging guns.

[0176] In some embodiments, the device is further configured to:

[0177] If the insulation resistance detected in multiple detection cycles is within the range of a first preset resistance value, it is determined that the vehicle is charged using the at least two charging guns.

[0178] In some embodiments, the insulation detection device includes a detection circuit and a preset resistor connected in parallel with the detection circuit, the preset resistor being connected to the detection circuit via a second contactor, and the device is further configured to:

[0179] During the charging insulation detection process using the insulation detection devices corresponding to the at least two charging guns, the closing of the second contactor is controlled within a detection cycle to connect the preset resistor to the detection circuit, thereby obtaining the insulation resistance within the current detection cycle.

[0180] In some embodiments, the detection circuit includes a first resistor, a first contactor, and a second resistor.

[0181] The first resistor is connected between the negative terminal of the power supply and the ground terminal; the first contactor is connected to the first resistor and configured to control the connection of the first resistor; the second resistor is connected between the negative terminal of the power supply and the ground terminal; the preset resistor and the second resistor are connected in parallel.

[0182] In some embodiments of this disclosure, when it is detected that the vehicle is being charged with at least two charging guns, an insulation detection device corresponding to one of the at least two charging guns is used to perform charging insulation detection. This achieves the use of a single insulation detection device to perform charging insulation detection when at least two charging guns are charging. The single insulation detection device is responsible for the insulation detection of at least two charging gun circuits, avoiding interference between the simultaneous use of at least two insulation detection devices and thus affecting the insulation detection results.

[0183] Some embodiments of this disclosure also provide a charging pile, which includes the vehicle charging insulation detection device described above.

[0184] This disclosure also provides an electronic device in some embodiments. The electronic device includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor. When executed by the processor, the computer program implements the methods described above.

[0185] Some embodiments of this disclosure also provide a computer-readable storage medium. A computer program is stored on the computer-readable storage medium, and when executed by a processor, the computer program implements the methods described above.

[0186] Some embodiments of this disclosure also provide a computer program product. This computer program product includes a computer program that, when executed by a processor, implements the methods described above.

[0187] As the device embodiment is basically similar to the method embodiment, the description is relatively simple, and relevant parts can be found in the description of the method embodiment.

[0188] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this disclosure are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, use and processing of the relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions, and corresponding operation portals are provided for users to choose to authorize or refuse.

[0189] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0190] Those skilled in the art will understand that some embodiments of this disclosure can be provided as methods, apparatus, or computer program products. Therefore, some embodiments of this disclosure can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, some embodiments of this disclosure can take the form of computer program products implemented on one or more computer-usable storage media (including, but not limited to, disk storage, compact disc read-only memory (CD-ROM), optical storage, etc.) containing computer-usable program code.

[0191] Some embodiments of this disclosure are described with reference to at least one flowchart or block diagram of a method, terminal device (system), and computer program product according to some embodiments of this disclosure. It will be understood that each of at least one of the flowcharts or blocks in at least one of the flowcharts or block diagrams, and combinations of at least one of the flowcharts or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in one or more flowcharts, one or more block diagrams, or one or more flowcharts and one or more block diagrams.

[0192] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts, one or more block diagrams, or one or more flowcharts and one or more block diagrams.

[0193] These computer program instructions may also be loaded onto a computer or other programmable data processing terminal equipment to cause a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable terminal equipment, provide steps for implementing the functions specified in one or more flowcharts, one or more block diagrams, or one or more flowcharts and one or more block diagrams.

[0194] Although exemplary embodiments of some embodiments of this disclosure have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the exemplary embodiments as well as all changes and modifications falling within the scope of the embodiments of this disclosure.

[0195] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the aforementioned element.

[0196] The above provides a detailed description of the vehicle charging insulation testing method, device, charging pile, equipment, and medium. Specific examples have been used to illustrate the principles and implementation methods of this disclosure. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this disclosure. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this disclosure. Therefore, the content of this specification should not be construed as a limitation of this disclosure.

Claims

1. A method for testing the charging insulation of a vehicle, comprising: If it is detected that the vehicle is being charged using at least two charging guns, an insulation detection device corresponding to one of the at least two charging guns is used to perform charging insulation detection.

2. The method according to claim 1, wherein, The step of performing the charging insulation test using an insulation detection device corresponding to one of the at least two charging guns includes: A target insulation detection device is determined from the insulation detection devices corresponding to the at least two charging guns, and the charging insulation detection is performed using the target insulation detection device.

3. The method according to claim 2, wherein, Determining the target insulation detection device corresponding to one charging gun from the insulation detection devices corresponding to the at least two charging guns includes: Based on the time sequence of each of the at least two charging guns, a target insulation detection device corresponding to one of the insulation detection devices corresponding to the at least two charging guns is determined.

4. The method according to claim 2 or 3, further comprising: If it is detected that both charging guns have stopped charging, the charging insulation detection using the target insulation detection device shall be stopped.

5. The method according to any one of claims 2 to 4, further comprising: If it is detected that one of the at least two charging guns has stopped charging, and the charging gun that has stopped charging is the charging gun corresponding to the target insulation detection device, the charging insulation detection shall be switched to the insulation detection device corresponding to the other of the at least two charging guns.

6. The method according to any one of claims 2 to 5, further comprising: If it is detected that one of the at least two charging guns has stopped charging, and the charging gun that has stopped charging is not the charging gun corresponding to the target insulation detection device, the charging insulation detection shall continue to be performed using the target insulation detection device.

7. The method according to any one of claims 1 to 6, wherein, The step of performing the charging insulation test using an insulation detection device corresponding to one of the at least two charging guns includes: In the Nth detection cycle, the charging insulation detection is performed using the insulation detection device corresponding to one of the at least two charging guns, and in the N+1th detection cycle, the electrical insulation detection is performed using the insulation detection device corresponding to the other of the at least two charging guns. Where N is a positive integer greater than or equal to 1.

8. The method according to any one of claims 1 to 7, further comprising: Before performing the charging insulation test using the insulation detection device corresponding to one of the at least two charging guns. Obtain the vehicle identifier sent by the vehicle-side communication controller corresponding to the at least two charging guns; If the vehicle identifiers sent by the vehicle-side communication controllers corresponding to the at least two charging guns are the same, it is determined that the vehicle is being charged using the at least two charging guns.

9. The method according to claim 8, wherein, The step of obtaining the vehicle identifier sent by the vehicle-side communication controller corresponding to the at least two charging guns includes: obtaining the vehicle identifier sent by the vehicle-side communication controller corresponding to the at least two charging guns based on value-added services.

10. The method according to any one of claims 1 to 7, further comprising: Before performing the charging insulation test using the insulation detection device corresponding to one of the at least two charging guns. The insulation resistance is obtained by using the insulation detection device corresponding to the at least two charging guns to perform the charging insulation detection. If the insulation resistance is within the first preset resistance range, it is determined that the vehicle is charged using the at least two charging guns.

11. The method according to claim 10, wherein, The step of determining that the vehicle is charged using the at least two charging guns when the insulation resistance is within the first preset resistance range includes: If the insulation resistance detected in multiple detection cycles is within the range of the first preset resistance value, it is determined that the vehicle is charged using the at least two charging guns.

12. The method according to claim 10 or 11, wherein, The insulation detection device includes a detection circuit and a preset resistor connected in parallel with the detection circuit. The preset resistor is connected to the detection circuit through a second contactor. The step of performing the charging insulation detection using the insulation detection devices corresponding to the at least two charging guns to obtain the insulation resistance includes: During the charging insulation detection process using the insulation detection devices corresponding to the at least two charging guns, the closing of the second contactor is controlled within a detection cycle to connect the preset resistor to the detection circuit, thereby obtaining the insulation resistance within the current detection cycle.

13. The method according to claim 12, wherein, The detection circuit includes: The first resistor is connected between the negative terminal of the power supply and the ground terminal; A first contactor, connected to the first resistor, and configured to control the connection of the first resistor; and The second resistor is connected between the negative terminal of the power supply and the ground terminal; The preset resistor and the second resistor are connected in parallel.

14. A device for detecting the charging insulation of a vehicle, configured as follows: If it is detected that the vehicle is being charged using at least two charging guns, an insulation detection device corresponding to one of the at least two charging guns is used to perform charging insulation detection.

15. A charging pile, comprising the vehicle charging insulation detection device according to claim 14.

16. An electronic device comprising a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements the method according to any one of claims 1 to 13.

17. A computer-readable storage medium, wherein, A computer program is stored on the computer-readable storage medium, which, when executed by a processor, implements the method according to any one of claims 1 to 13.

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