Charging control method and apparatus, and vehicle

Abstract

The present application discloses a charging control method and apparatus, and a vehicle. The charging control method comprises: when a charging device is connected to a charging port of the vehicle and performs insulation detection, monitoring a first voltage at the charging port; and determining an output voltage range of the charging device on the basis of the first voltage. In this way, a voltage platform specification of the charging device is determined and identified in advance.

Description

Charging control method, device and vehicle

[0001] The present application claims priority to the Chinese patent application No. 202410479273.2, filed on April 17, 2024, and entitled "Charging control method, device and vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of charging, and more particularly to a charging control method, device and vehicle. BACKGROUND

[0003] With the increasing market share of new energy vehicles year by year, the endurance problem of electric vehicles has always been a difficulty for new energy vehicle manufacturers to solve. As a fast energy supplement way for electric vehicles, direct current charging function has attracted widespread attention in new energy vehicle charging. The current new energy vehicle direct current charging standard is GB / T 27930-2015 "Communication Protocol between Non-vehicle Conductive Charger and Battery Management System of Electric Vehicle". However, in the related art, the electric vehicle needs to transmit the vehicle recognition information message (BRM, Battery Recognition Message) and the power storage battery charging parameter message (BCP, Battery Charging Parameters) to the charger before it can obtain the charger maximum output capability message (CML, Charger Maximum Lab) sent by the charger and identify the voltage specification of the charger, thereby causing the electric vehicle to learn the voltage specification of the charger relatively late. SUMMARY

[0004] The present application is proposed to solve at least one of the above problems. According to a first aspect of the present application, a charging control method is provided, which includes: monitoring a first voltage at a charging port when a charging device is connected to the charging port of a vehicle and insulation detection is performed; and determining an output voltage range of the charging device according to the first voltage.

[0005] In an embodiment of the present application, when the charging device is connected to the charging port of the vehicle and the insulation detection is performed, the first voltage at the charging port is monitored, including: after receiving a charger handshake message sent by the charging device, the first voltage at the charging port is monitored in real time.

[0006] In an embodiment of the present application, the output voltage range of the charging device is determined according to the first voltage, including: before receiving a recognition signal request message sent by the charging device, if the first voltage is not less than a first target voltage value and the duration is not less than a first target duration, the output voltage range of the charging device is determined as a first voltage range.

[0007] In an embodiment of the present application, the determining the output voltage range of the charging device according to the first voltage further comprises: before receiving the identification signal request message sent by the charging device, if the first voltage is not less than the first target voltage value and the duration is less than the first target duration, determining that the output voltage range of the charging device is the second voltage range.

[0008] In an embodiment of the present application, the first target voltage value is the smaller one of a first reference value and a second reference value; wherein the first reference value is equal to the maximum allowed charging voltage value of the vehicle battery minus the allowed charging voltage difference; and the second reference value is determined based on the first voltage range and the voltage drop of the internal wire of the charging device.

[0009] In an embodiment of the present application, the charging control method further comprises: determining the current battery voltage of the vehicle battery in the battery charging parameter message sent to the charging device according to the output voltage range of the charging device.

[0010] In an embodiment of the present application, the determining the current battery voltage of the vehicle battery in the battery charging parameter message sent to the charging device according to the output voltage range of the charging device comprises: if the output voltage range of the charging device is the first voltage range, taking the current actual battery voltage of the vehicle battery as the current battery voltage of the vehicle battery; wherein the upper limit value of the first voltage range is not less than the current actual battery voltage of the vehicle battery.

[0011] In an embodiment of the present application, the determining the current battery voltage of the vehicle battery in the battery charging parameter message sent to the charging device according to the output voltage range of the charging device comprises: if the output voltage range of the charging device is the second voltage range, taking the second target voltage value as the current battery voltage of the vehicle battery; wherein the upper limit value of the second voltage range is less than the current actual battery voltage of the vehicle battery, and the second target voltage value is within the second voltage range.

[0012] In an embodiment of the present application, the charging control method further comprises: if the charging port does not support the charging device currently connected to charge the vehicle battery, issuing a charging machine voltage mismatch fault message.

[0013] In an embodiment of the present application, the charging control method further comprises: when the output voltage range of the charging device is the second voltage range, if the charging port cannot be connected to the vehicle battery through the boost circuit, determining that the charging port does not support the charging device currently connected to charge the vehicle battery; wherein the upper limit value of the second voltage range is less than the current actual battery voltage of the vehicle battery.

[0014] In an embodiment of the present application, the charging control method further comprises: after the charging device sequentially completes the insulation detection and the bleed-off voltage, monitoring a second voltage at the charging port; and if the second voltage meets a pre-charge precondition, performing pre-charge of a pre-charge device connected to the charging port by the vehicle-mounted battery of the vehicle.

[0015] In an embodiment of the present application, after the charging device sequentially completes the insulation detection and the bleed-off voltage, monitoring the second voltage at the charging port comprises: after receiving a charging machine maximum output capability message sent by the charging device and determining that the charging port supports the charging device currently connected to charge the vehicle-mounted battery, monitoring the second voltage at the charging port.

[0016] In an embodiment of the present application, after the charging device sequentially completes the insulation detection and the bleed-off voltage, monitoring the second voltage at the charging port comprises: after receiving an identification signal feedback message sent by the charging device, monitoring the second voltage at the charging port; wherein the identification signal feedback message is sent by the charging device based on receiving a battery charging parameter message sent by the vehicle.

[0017] In an embodiment of the present application, if the second voltage does not meet the pre-charge precondition, a voltage abnormality fault message of the charging port is sent.

[0018] In an embodiment of the present application, the pre-charge precondition comprises: during monitoring for a second target time length, the second voltage is less than a third target voltage value and the duration is not less than a third target time length; wherein the third target time length is not greater than the second target time length.

[0019] In an embodiment of the present application, performing pre-charge of the pre-charge device connected to the charging port by the vehicle-mounted battery of the vehicle comprises: when the charging port needs to charge the vehicle-mounted battery through a boost circuit, taking a pre-charge capacitor in the boost circuit as the pre-charge device and controlling the vehicle-mounted battery and the pre-charge capacitor to be conductive, so that the vehicle-mounted battery pre-charges the pre-charge capacitor; and within a fourth target time length of pre-charge of the pre-charge capacitor by the vehicle-mounted battery, if a first preset condition between the voltage of the pre-charge capacitor and the current battery voltage of the vehicle-mounted battery in the battery charging parameter message is met and the duration is not less than a fifth target time length, it is determined that the pre-charge of the pre-charge capacitor is completed; wherein the battery charging parameter message is sent by the vehicle to the charging device after receiving the identification signal feedback message sent by the charging device, and the fifth target time length is not greater than the fourth target time length.

[0020] In an embodiment of the present application, within the fourth target time length of pre-charge of the pre-charge capacitor by the vehicle-mounted battery, if the first preset condition between the voltage of the pre-charge capacitor and the current battery voltage of the vehicle-mounted battery is met and the duration is less than the fifth target time length, a pre-charge failure fault message is sent.

[0021] In an embodiment of the present application, the first preset condition comprises: an absolute value of a difference between the current battery voltage of the vehicle-mounted battery and the voltage of the pre-charging capacitor is less than or equal to a first target voltage threshold, or a ratio between the absolute value of the difference and the current battery voltage of the vehicle-mounted battery is less than or equal to a first target proportion coefficient; wherein the first target proportion coefficient is greater than 0 and less than or equal to 0.1.

[0022] In an embodiment of the present application, the pre-charging of the vehicle-mounted battery to the pre-charging device connected to the charging port comprises: when the charging port does not need to be charged by the vehicle-mounted battery through the boost circuit, taking the pre-charging resistor electrically connected to the charging port as the pre-charging device, and controlling the conduction between the vehicle-mounted battery and the charging port through the pre-charging resistor, so that the vehicle-mounted battery pre-charges the pre-charging resistor; within a sixth target time length of the pre-charging of the vehicle-mounted battery to the pre-charging resistor, if the voltage at the charging port and the current battery voltage of the vehicle-mounted battery in the battery charging parameter message satisfy a second preset condition and the duration is not less than a seventh target time length, it is determined that the pre-charging of the pre-charging resistor is completed; wherein the battery charging parameter message is sent by the vehicle to the charging device after receiving the identification signal feedback message sent by the charging device, and the seventh target time length is not greater than the sixth target time length.

[0023] In an embodiment of the present application, within the sixth target time length of the pre-charging of the vehicle-mounted battery to the pre-charging resistor, if the voltage at the charging port and the current battery voltage of the vehicle-mounted battery satisfy the second preset condition and the duration is less than the seventh target time length, a pre-charging failure fault message is sent.

[0024] In an embodiment of the present application, the second preset condition comprises: an absolute value of a difference between the current battery voltage of the vehicle-mounted battery and the voltage at the charging port is less than or equal to a second target voltage threshold, or a ratio between the absolute value of the difference and the current battery voltage of the vehicle-mounted battery is less than or equal to a second target proportion coefficient; wherein the second target proportion coefficient is greater than 0 and less than or equal to 0.1.

[0025] According to the second aspect of the present application, a charging control device is also provided, which comprises a storage medium and a processor, and the storage medium stores a computer program run by the processor, and the computer program makes the processor execute the charging control method of any one of the above when run by the processor.

[0026] According to the third aspect of the present application, a vehicle is also provided, which comprises a charging port and the charging control device of any one of the above.

[0027] According to the charging control method and device and the vehicle provided in the embodiments of the present application, the first voltage at the charging port is actively monitored when the charging device is connected to the charging port of the vehicle and insulation detection is performed, and the output voltage range of the charging device is determined according to the first voltage, so that the voltage platform specification of the charging device is identified in advance. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced in the following. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and all other drawings obtained by those skilled in the art without creative effort should fall within the protection scope of the present application.

[0029] FIG. 1 is a flowchart of a charging control method according to an embodiment of the present application;

[0030] FIG. 2 is a circuit topology diagram of a direct current double charging circuit according to an embodiment of the present application;

[0031] FIG. 3 is a flowchart of a charging control method according to another embodiment of the present application;

[0032] FIG. 4 is a control flowchart when pre-charging is performed based on the direct current boost circuit shown in FIG. 2;

[0033] FIG. 5 is a control flowchart when pre-charging is performed based on the direct current direct connection circuit shown in FIG. 2;

[0034] FIG. 6 is a schematic block diagram of a charging control device according to an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present application more obvious, the example embodiments according to the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments only represent some of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited by the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present application.

[0036] In the following description, a large number of specific details are given in order to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid obscuring the present application, some technical features known in the art are not described.

[0037] It is to be understood that the application can assume various alternative embodiments, and should not be limited to the examples described herein. Rather, the embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0038] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. In order to fully understand the application, a detailed description will be made in the following description of the embodiments with reference to the attached drawings. Alternative embodiments of the application will be described in detail in the following description of the embodiments. However, the application can have other embodiments in addition to the detailed description.

[0039] Some embodiments of the application will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0040] First, the application scenario of the charging control method exemplified by the application is introduced. The charging control method is applied to the interactive control process before the charging device charges the vehicle-mounted battery of the vehicle after the charging device and the charging port of the vehicle are connected together.

[0041] Referring to FIG. 1, the application provides a charging control method, which comprises:

[0042] Step one: when the charging device and the charging port of the vehicle are connected and insulation detection is performed, the first voltage at the charging port is monitored.

[0043] Step two: according to the first voltage, the output voltage range of the charging device is determined.

[0044] In the above scheme, by actively monitoring the first voltage at the charging port when the charging device and the charging port of the vehicle are connected and insulation detection is performed, and according to the first voltage, the output voltage range of the charging device is determined, the voltage platform specification of the charging device is identified in advance. The above steps will be described in detail below with reference to the accompanying drawings.

[0045] Exemplarily, referring to the double direct current charging topology diagram shown in FIG. 2, it includes: M1 step-up / down circuit (i.e. step-up circuit), M2 direct connection circuit, M3 control module, M4 power battery (vehicle-mounted battery). The M1 module includes M5 module relay and M6 step-up / down module. The power battery M4 is connected with the step-up / down circuit M1 and the direct connection circuit M2 through the relays K7 and K8. Of course, it should be noted that the charging control method shown in the embodiments of the present application is not limited to be used based on the double direct current charging topology diagram shown in FIG. 2, and can also be used based on other charging topology diagrams.

[0046] The direct current charging port A is connected with the vehicle-mounted battery through the step-up circuit, so that the direct current charging port A can support step-up charging and direct connection charging. The charging circuit of the direct current charging port A is direct current charging circuit one. The direct current charging port B is directly connected with the vehicle-mounted battery, so that the direct current charging port B only supports charging the vehicle-mounted battery by using direct connection. Of course, in other embodiments, the direct current charging port A and the direct current charging port B can use some switching components, so that each direct current charging port can be configured to charge the vehicle-mounted battery through the step-up circuit.

[0047] As shown in FIG. 2, the charging circuit one includes the power battery M4 and the step-up / down circuit M1. The charging circuit two includes the power battery M4 and the direct connection circuit M2. The control module M3 is connected with the direct current charging circuit one and the direct current charging circuit two respectively, wherein after receiving the charging confirmation signal, the control module M3 controls the charging circuit one and the charging circuit two to charge the power battery M4.

[0048] The control module M3 is a vehicle-mounted controller integrated with direct current charging function, which can be one or more controllers. The control module M3 should include two groups of independent direct current charging control guide circuits, which perform CAN signal interaction with the charger through the charging sub-network to control each stage of the direct current charging, control the direct current charging contactors of the two direct current charging circuits, and monitor the voltage of the charging port and the voltage across the pre-charging capacitor C1 in the step-up circuit in real time. In the judgment process shown below, exemplarily, the precondition can be that the relays K7 and K8 shown in FIG. 2 are closed, and the relay K9 is disconnected.

[0049] Firstly, referring to FIG. 1, when the charging device is connected with the charging port of the vehicle and insulation detection is performed, the first voltage at the charging port is monitored. For example, after the charging gun on the charging device is plugged into the charging port on the vehicle, the charging device performs insulation detection. During the insulation detection performed by the charging device, the vehicle actively monitors the first voltage at the charging port connected with the charging device, so that the output voltage range of the charging device is determined according to the monitored first voltage, and the voltage platform specification of the charging device is determined. For example, the output voltage range of the charging device can be a value, for example, the output voltage range of the charging device can be 750V or 500V. Of course, in other embodiments, the output voltage range of the charging device can be a voltage range segment, for example, the output voltage range of the charging device can be 700V-800V, 650V-850V, 450V-550V, 400V-600V, etc. Since there are mainly two charging voltage specifications of 500V and 750V in the current domestic direct current charging facilities, the output voltage range of the charging device can include a first voltage range and a second voltage range. The first voltage range can be a charging voltage specification of 750V, and the second voltage range can be a charging voltage specification of 500V.

[0050] For example, the first voltage at the charging port can be monitored after the charging device and the charging port of the vehicle complete handshake. For example, referring to FIG. 3, when the charging device is connected with the charging port of the vehicle and insulation detection is performed, the first voltage at the charging port is monitored, which can be performed in the following manner: after receiving the charging machine handshake message (CHM in FIG. 3 represents the charging machine handshake message sent by the charging device to the vehicle, which only contains the communication protocol version number) sent by the charging device, the first voltage at the charging port is monitored in real time. Of course, in other embodiments, referring to FIG. 3, the first voltage at the charging port can also be monitored in the following manner: after sending the vehicle handshake message (BHM in FIG. 3 represents the vehicle handshake message sent by the vehicle to the charging machine, which only contains the maximum allowed total charging voltage) to the charging device, the first voltage at the charging port is monitored in real time. Referring to FIG. 3, since the protocol stipulates that the start time of the insulation detection of the charging device is after the charging device receives the BHM sent by the vehicle, in the above-mentioned embodiments of the application, the first voltage at the charging port can be actively monitored in advance, so that the charging device has started to monitor the voltage at the charging port connected with the charging device when the insulation detection is performed.

[0051] Next, referring to FIG. 1, the output voltage range of the charging device is determined according to the first voltage. That is, the output voltage range of the charging device is determined according to the first voltage monitored at the charging port when the charging device performs insulation detection, so that the voltage platform specification of the charging device is identified in advance. Compared with the related art, in which the maximum output capability message (CML) sent by the charging machine is obtained only after the vehicle identification information message (BRM) and the power battery charging parameter message (BCP) message are transmitted from the electric vehicle to the charging machine, and the voltage specification of the charging machine is identified. In the present application, the output voltage specification of the charging device can be obtained during or after the insulation detection of the charging device.

[0052] For example, when the output voltage range of the charging device is determined according to the first voltage, referring to FIG. 3, if the first voltage monitored at the charging port is not less than the first target voltage value and the duration is not less than the first target duration before the identification signal request message (CRM SPN 2560 = 0x00 in FIG. 3) sent by the charging device is received, it is determined that the lower limit value of the output voltage range of the charging device is not less than the first target voltage value, and the output voltage range of the charging device is determined as the first voltage range.

[0053] For example, when the output voltage range of the charging device is determined according to the first voltage, referring to FIG. 3, if the first voltage monitored at the charging port is not less than the first target voltage value and the duration is not less than the first target duration before the identification signal request message (CRM SPN 2560 = 0x00 in FIG. 3) sent by the charging device is received, it is determined that the lower limit value of the output voltage range of the charging device is not less than the first target voltage value, and the output voltage range of the charging device is determined as the first voltage range.

[0054] In determining the first target voltage value, various determination methods can be used. For example, the first target voltage value can be the smaller one of a first reference value and a second reference value. The first reference value is equal to the highest allowable charging voltage value of the vehicle battery minus the allowable charging voltage difference, and the second reference value is determined based on the first voltage range and the voltage drop of the internal wire of the charging device.

[0055] For example, the charging control method can further include determining the current battery voltage of the vehicle-mounted battery in the battery charging parameter message (e.g., BCP in FIG. 3) sent to the charging device according to the output voltage range of the charging device. In the related art, the vehicle does not know the output voltage range of the charging device when sending the battery charging parameter message to the charging device, so the actual current battery voltage of the vehicle-mounted battery is directly used as the current battery voltage of the vehicle-mounted battery in the BCP. In this embodiment, instead of directly using the actual current battery voltage of the vehicle-mounted battery as the current battery voltage of the vehicle-mounted battery in the BCP, the current battery voltage of the vehicle-mounted battery in the BCP sent to the charging device is determined according to the output voltage range of the charging device.

[0056] When determining the current battery voltage of the vehicle-mounted battery in the battery charging parameter message sent to the charging device according to the output voltage range of the charging device, various methods can be used.

[0057] For example, when determining the current battery voltage of the vehicle-mounted battery in the battery charging parameter message sent to the charging device according to the output voltage range of the charging device, if the output voltage range of the charging device is a first voltage range, the actual current battery voltage of the vehicle-mounted battery is used as the current battery voltage of the vehicle-mounted battery. The upper limit of the first voltage range is not less than the actual current battery voltage of the vehicle-mounted battery. This indicates that the vehicle knows that the actual current battery voltage of the vehicle-mounted battery is within the first voltage range, i.e., the charging device can directly charge the vehicle-mounted battery without using a boost circuit.

[0058] For example, when determining the current battery voltage of the vehicle-mounted battery in the battery charging parameter message sent to the charging device according to the output voltage range of the charging device, if the output voltage range of the charging device is the second voltage range, the second target voltage value is taken as the current battery voltage of the vehicle-mounted battery. The upper limit value of the second voltage range is less than the actual current battery voltage of the vehicle-mounted battery, and the second target voltage value is within the second voltage range. At this time, the vehicle knows that the actual current battery voltage of the vehicle-mounted battery is greater than the output voltage range of the charging device, and at this time, the charging device cannot directly charge the vehicle-mounted battery, but needs to charge the vehicle-mounted battery through a boost circuit. However, in order to prevent the charging device from unilaterally stopping the charging process after obtaining the BCP sent by the vehicle by directly judging that the charging device cannot charge the vehicle-mounted battery. Therefore, in the embodiment, the vehicle does not take the actual current battery voltage of the vehicle-mounted battery as the current battery voltage of the vehicle-mounted battery, but takes the second target voltage value as the current battery voltage of the vehicle-mounted battery, and the second target voltage value is within the second voltage range, so that the charging device will not unilaterally stop the charging process after obtaining the BCP sent by the vehicle by directly judging that the charging device cannot charge the vehicle-mounted battery.

[0059] For example, as shown in FIG. 2 and FIG. 3. In the vehicle handshake stage 01-charging machine voltage platform identification process in the direct current charging circuit one, after receiving the charging machine CHM (charging machine handshake message) message, the vehicle monitors the voltage of the charging port in the direct current charging circuit one in real time through the control module M3. The voltage of the charging machine insulation detection is the smaller value (min{Ubhm, Ucml_max}) of the maximum allowed charging total voltage BHM (the BHM message only contains the “maximum allowed charging total voltage”) of the vehicle-mounted battery (such as the power battery M4 in FIG. 2) of the vehicle and the maximum output voltage CMLmax of the charging device, which is taken as the first target voltage value.

[0060] For example, if the control module M3 monitors that the charging port voltage continuously exists for 200 ms≥min{Ubhm-20V, 745V} before receiving the CRM=0x00, (745V is a second reference value, considering the voltage drop on the internal wiring harness of the charging device, which can be adjusted. The monitoring time of 200 ms of the first target duration can also be adjusted according to the actual situation, then it is considered that the voltage platform capability of the charging device is greater than or equal to 750V, and the current battery voltage (SPN2822) value of the vehicle-mounted power battery in the BCP power storage battery charging parameter message sent by the vehicle in the subsequent configuration stage sends the actual voltage value of the power battery of the current vehicle.

[0061] For example, if the control module M3 detects that the voltage value at the charging port does not meet the condition, then the current battery voltage (SPN2822) of the vehicle power battery in the BCP power battery charging parameter message sent by the electric vehicle in the subsequent configuration stage is equal to 420V. 420V can be appropriately adjusted according to the minimum output voltage capability of the actual charger, and the value is recommended to be 420V in this application.

[0062] For example, the charging control method can further include: if the charging port does not support the currently connected charging device to charge the vehicle battery, issuing a charger voltage mismatch fault message. This facilitates the user to know the specific fault reason why the charging device cannot charge the vehicle battery.

[0063] For example, when determining whether the charging port supports the currently connected charging device to charge the vehicle battery, not only the size relationship between the output voltage range of the charging device and the current actual voltage of the vehicle battery is considered, but also the way in which the charging port connected with the charging device is connected with the vehicle battery. For example, the charging port connected with the charging device can be connected with the vehicle battery through a boost circuit. At this time, the charging port not only supports charging the vehicle battery in a direct connection mode, but also supports charging the vehicle battery in a boost circuit mode. Alternatively, the charging port connected with the charging device cannot be connected with the vehicle battery through a boost circuit, but is connected with the vehicle battery in a direct connection mode. At this time, the vehicle battery can only support charging the vehicle battery in a direct connection mode.

[0064] For example, the charging control method can further include: when the output voltage range of the charging device is a second voltage range, if the charging port cannot be connected with the vehicle battery through a boost circuit, it is determined that the charging port does not support the currently connected charging device to charge the vehicle battery. The upper limit value of the second voltage range is less than the current actual battery voltage of the vehicle battery. At this time, since the upper limit value of the output voltage range of the charging device is less than the current actual battery voltage of the vehicle battery, the charging device cannot charge the vehicle battery in a direct connection mode. If the charging port connected with the charging device does not support being connected with the vehicle battery through a boost circuit, so the charging port and the charging device are not matched at this time, it is determined that the charging port does not support the currently connected charging device to charge the vehicle battery, and a charger voltage mismatch fault message is issued.

[0065] For example, the charging control method can further include: if the charging port supports the currently connected charging device to charge the vehicle battery, it is indicated that the charger voltage mismatch fault will not occur, and no charger voltage mismatch fault message is issued. Continue to the pre-charging process and the like.

[0066] For example, referring to FIG. 2 and FIG. 3, in the DC charging circuit II, when the control module M3 receives the charging machine maximum output voltage CML_max < the current actual battery voltage of the power battery M4 of the vehicle, the current process is immediately ended, the control module M3 internally records the fault "charging machine voltage mismatch", and sends a CAN message to the CAN communication network of the vehicle.

[0067] For example, in some embodiments, after the insulation detection and the discharge voltage of the charging device are completed, the charging circuit of the vehicle can monitor the voltage at the charging port before pre-charging, determine the voltage at the charging port through specific conditions, and ensure that the vehicle meets the pre-charging precondition. Even if the vehicle does not meet the pre-charging precondition at this time, the fault cause can be quickly locked.

[0068] For example, the charging control method can further include: monitoring a second voltage at the charging port after the charging device sequentially completes insulation detection and discharge voltage. If the second voltage meets the pre-charging precondition, the vehicle's on-board battery pre-charges the pre-charging device connected to the charging port. Compared with the related art directly pre-charging method, in this embodiment, after the charging device sequentially completes insulation detection and discharge voltage, the second voltage at the charging port is monitored, and a judgment step of determining whether the second voltage meets the pre-charging precondition is performed. Only when the second voltage meets the pre-charging precondition, the vehicle's on-board battery pre-charges the pre-charging device connected to the charging port. In some embodiments, if the second voltage does not meet the pre-charging precondition, a voltage abnormality fault message of the charging port is sent, so that the user can know the specific fault reason why the charging device cannot charge the vehicle.

[0069] The timing of monitoring the second voltage at the charging port is after the charging device sequentially completes insulation detection and discharge voltage. In some embodiments, after the charging device sequentially completes insulation detection and discharge voltage, the second voltage at the charging port can be monitored after receiving the charging machine maximum output capability message (such as the CML shown in FIG. 3) sent by the charging device. Of course, in a more preferred embodiment, the second voltage at the charging port can be monitored after receiving the charging machine maximum output capability message sent by the charging device and determining that the charging port supports the current connected charging device to charge the on-board battery. If it is determined that the charging port does not support the current connected charging device to charge the on-board battery after receiving the charging machine maximum output capability message sent by the charging device, the subsequent charging matching process can be directly ended, and pre-charging is not needed, so there is no need to monitor the second voltage at the charging port.

[0070] In other embodiments, after the charging device sequentially completes the insulation detection and the bleed-off voltage, when monitoring the second voltage at the charging port, as shown in FIG. 3, the second voltage at the charging port can be monitored after receiving the identification signal feedback message sent by the charging device. The identification signal feedback message is sent by the charging device to the vehicle based on receiving the battery charging parameter message sent by the vehicle. As shown in CRM SPN2560 = 0xAA in FIG. 3, the identification signal feedback message is represented.

[0071] In determining the pre-charging precondition, various methods can be used. For example, the pre-charging precondition can include that, during the monitoring of the second target duration, the second voltage is less than the third target voltage value, and the duration is not less than the third target duration. The third target duration is not greater than the second target duration. That is, only when the bleed-off voltage of the charging device reaches a certain level, it is determined that the pre-charging precondition is met.

[0072] For example, in FIGS. 2 and 3, in the first DC charging circuit and the second DC charging circuit, after the vehicle receives the charger CML “charger maximum output capability message”, the control module M3 immediately performs 02-charging port voltage judgment in FIG. 3, and starts to judge the second voltage at the DC charging port for the longest 2s. If the voltage at the DC charging port is less than 60V and lasts for 100ms within 2s (wherein the 2s timing and the 100ms duration can be adjusted according to actual conditions), the timing is stopped, and 03-charging circuit pre-charging of the vehicle in FIG. 3 is immediately performed. Otherwise, at the end of the timing, the control module M3 ends the DC charging process, and records the fault code “DC charging port voltage abnormality”.

[0073] In other embodiments, the 02-charging port voltage judgment start condition in FIG. 3 can be adjusted. In the above embodiment, after the vehicle receives the charger CML “charger maximum output capability message”, the control module M3 immediately performs 02-charging port voltage judgment. In this embodiment, it can be replaced by that after the vehicle receives the charger CRM SPN2560 = 0xAA, the control module M3 immediately performs 02-charging port voltage judgment in FIG. 3.

[0074] In addition, when the pre-charging of the vehicle battery to the pre-charging device connected to the charging port is performed, the pre-charging device can be determined according to the type of the charging loop between the charging port and the vehicle battery. For example, when the output voltage range of the charging device is relatively high, the charging port can be directly connected to the vehicle battery to charge the vehicle battery, and the pre-charging device is a pre-charging resistor (for example, R1 in FIG. 2). When the output voltage range of the charging device is relatively low, the charging port needs to be connected to the vehicle battery through a boost loop to charge the vehicle battery, and the pre-charging device is a pre-charging capacitor in the boost loop (for example, C1 in FIG. 2). In some embodiments, the success of the DC charging pre-charging of the vehicle can also be determined by specific conditions.

[0075] For example, when the pre-charging of the vehicle battery to the pre-charging device connected to the charging port is performed, when the charging port needs to be connected to the vehicle battery through a boost loop to charge the vehicle battery, the pre-charging capacitor in the boost loop is used as the pre-charging device, and the vehicle battery is connected to the pre-charging capacitor to pre-charge the pre-charging capacitor. Within the fourth target time period of the pre-charging capacitor pre-charging the pre-charging capacitor, if the first preset condition is met between the voltage of the pre-charging capacitor and the current battery voltage of the vehicle battery, and the duration is not less than the fifth target time, it is determined that the pre-charging of the pre-charging capacitor is completed. The battery charging parameter message is sent by the vehicle to the charging device after receiving the identification signal feedback message sent by the charging device. The fifth target time is not greater than the fourth target time. For example, the fourth target time can be 2s, 3s, etc. The fifth target time can be 20ms, 300ms, etc.

[0076] In other embodiments, within the fourth target time period of the pre-charging capacitor pre-charging the pre-charging capacitor, if the first preset condition is met between the voltage of the pre-charging capacitor and the current battery voltage of the vehicle battery, and the duration is less than the fifth target time, a pre-charging failure fault message is sent. The user can know that the pre-charging failure causes the charging device to be unable to charge the vehicle battery.

[0077] When determining the first preset condition, various methods can be used. For example, the first preset condition can include that the absolute value of the difference between the current battery voltage of the vehicle battery and the voltage of the pre-charging capacitor is less than or equal to the first target proportionality coefficient. The ratio between the current battery voltage of the vehicle battery and the voltage of the pre-charging capacitor is less than or equal to the first target proportionality coefficient. The first target proportionality coefficient is greater than zero and less than or equal to 0.1. Specifically, the first target proportionality coefficient can be 0.03, 0.05, etc.

[0078] In some embodiments, within the fourth target duration of pre-charging the pre-charging capacitor by the vehicle battery, if the first preset condition is met between the voltage of the pre-charging capacitor and the current battery voltage of the vehicle battery in the battery charging parameter message, and the duration reaches a fifth target duration, it is determined that the pre-charging of the pre-charging capacitor is completed. The fifth target duration can be 200 ms, 300 ms, etc.

[0079] For example, referring to FIGS. 2, 3 and 4, in the DC charging circuit one, after the control module M3 sends the BRO SPN2829 = 0x00, the boost and buck module M6 controls the upper bridge arm VT5, VT3, VT1 to be turned on, and the lower bridge arm VT6, VT4, VT2 to be turned off, and then the control module M3 attracts K1 in the module relay M5, and starts to pre-charge the pre-charging capacitor C1 in the boost circuit. After K1 is attracted, the control module M3 starts to perform the longest 2s voltage judgment. If there is a 200 ms duration that satisfies:

[0080] (2s timing and 200 ms duration can be adjusted according to actual conditions), the control module M3 considers that the DC charging pre-charging is successful. The control module M3 immediately controls K2 in the module relay M5 to be attracted, and then delays 100 ms to attract K3 (100 ms can be adjusted according to actual conditions). Otherwise, the control module M3 ends the current process, records the fault "DC charging pre-charging failure" internally, and sends it to the CAN communication network of the vehicle through the CAN message.

[0081] Of course, in other embodiments, the first preset condition can also include that the absolute value of the difference between the current battery voltage of the vehicle battery and the voltage of the pre-charging capacitor is less than or equal to a first target voltage threshold. The first target voltage threshold can be 20V. It should be noted that 20V is the recommended value of the present application, and the actual value can be appropriately increased or decreased.

[0082] For example, in the first preset condition in FIG. 4, for the DC charging circuit one, it can be replaced by: |BCP current power storage battery voltage - C1 capacitor voltage|≤20V

[0083] Exemplarily, when the vehicle-mounted battery is pre-charged to the pre-charging resistor connected to the charging port, and the charging port does not need to be charged by the boost circuit, the pre-charging resistor connected to the charging port can be used as the pre-charging device (exemplarily, R1 in FIG. 2 represents the pre-charging resistor connected to the charging port), and the conduction between the vehicle-mounted battery and the charging port through the pre-charging resistor is controlled to pre-charge the vehicle-mounted battery to the pre-charging resistor. Within the sixth target time length of pre-charging the vehicle-mounted battery to the pre-charging resistor, if the second preset condition is met between the voltage at the charging port and the current battery voltage of the vehicle-mounted battery, and the duration is not less than the seventh target time length, it is determined that the pre-charging of the pre-charging resistor is completed. The battery charging parameter message is sent by the vehicle to the charging device after receiving the identification signal feedback message sent by the charging device, and the seventh target time length is not greater than the sixth target time length. Exemplarily, the sixth target time length can be 2s, 3s, etc. The seventh target time length can be 200ms, 300ms, etc.

[0084] In other embodiments, within the sixth target time length of pre-charging the vehicle-mounted battery to the pre-charging resistor, if the second preset condition is met between the voltage at the charging port and the current battery voltage of the vehicle-mounted battery, and the duration is less than the seventh target time length, a pre-charging failure fault message is sent. This facilitates the user to know that the pre-charging failure causes the charging device to be unable to charge the vehicle-mounted battery.

[0085] In determining the second preset condition, various ways can be used. Exemplarily, the second preset condition can include that the absolute value of the difference between the current battery voltage of the vehicle-mounted battery and the voltage at the charging port is less than or equal to the second target proportionality coefficient. The second target proportionality coefficient is greater than zero and less than or equal to 0.1. Specifically, the second target proportionality coefficient can be 0.03, 0.05, etc.

[0086] In some embodiments, within the sixth target time length of pre-charging the vehicle-mounted battery to the pre-charging resistor, if the second preset condition is met between the voltage at the charging port and the current battery voltage of the vehicle-mounted battery in the battery charging parameter message, and the duration reaches the seventh target time length, it is determined that the pre-charging of the pre-charging resistor is completed. The seventh target time length can be 200ms, 300ms, etc.

[0087] Exemplarily, referring to FIGS. 2, 3 and 5, in the DC charging circuit two, after the control module M3 sends the BRO SPN2829=0x00, the control module M3 first controls the relay K6 to be attracted, and 100ms later, the control module M3 controls the relay K5 to be attracted (100ms can be adjusted according to actual conditions). After the relay K5 is attracted, the control module M3 starts the longest 2s voltage judgment, and if there is a duration of 200ms that satisfies:

[0088] After the 2S timing and the 200 ms duration are adjusted according to actual conditions, the control module M3 considers that the DC charging pre-charging is successful. The control module M3 immediately controls the relay K4 to be attracted, and then delays 100 ms to disconnect K6 (100 ms can be adjusted according to actual conditions). Otherwise, the control module M3 ends the current process, internally records a fault "DC charging pre-charging failure", and sends a CAN message to the vehicle CAN communication network.

[0089] Of course, in other embodiments, the second preset condition can also include that the absolute value of the difference between the current battery voltage of the vehicle-mounted battery and the voltage at the charging port is less than or equal to a second target voltage threshold. The second target voltage threshold can be 20V. It should be noted that the 20V voltage is a recommended value in this application, and the actual value can be appropriately increased or decreased.

[0090] For example, in the second preset condition in FIG. 5, for the DC charging circuit two, it can be replaced with: |BCP current power storage battery voltage - C1 capacitor voltage|≤20V

[0091] For example, referring to FIG. 2, the charging port described above can be a DC charging port, and the charging device at this time can be a DC charging device. The charging port described above mainly refers to the charging port that has been plugged and connected with the charging device. In the double DC charging port as shown in FIG. 2, the charging port described above is the charging port in the double DC charging port that has been plugged and connected with the charging gun of the charging device. Of course, in other embodiments, the charging port described above can also be an AC charging port, and the charging device at this time can be an AC charging device. Of course, since the vehicle-mounted battery needs to be charged with DC, an AC-to-DC circuit needs to be arranged between the charging port and the vehicle-mounted battery to convert the AC input through the charging port into DC. The control process described above can be adjusted accordingly for the direct connection charging circuit and the boost charging circuit.

[0092] As can be seen, referring to FIGS. 2 and 3, when the control module M3 of the vehicle identifies the charging machine voltage platform specification in advance, the control module M3 has different processing strategies for the boost circuit and the direct connection circuit: ① When the control module M3 identifies that the charging machine voltage platform in the boost circuit is 500V, the charging mode is switched to the boost charging process; ② When the control module M3 identifies that the charging machine voltage platform in the boost circuit is 750V, the charging mode is switched to the direct connection charging process; ③ When the control module M3 identifies that the charging machine voltage platform in the direct connection circuit is 500V, a fault message is sent through CAN communication; and ④ When the control module M3 identifies that the charging machine voltage platform in the direct connection circuit is 750V, it is considered that the charging machine voltage platform specification meets the charging requirements.

[0093] In the various embodiments shown above, the first voltage at the charging port is actively monitored when the charging device is connected to the charging port of the vehicle and insulation detection is performed, and the output voltage range of the charging device is determined according to the first voltage, so that the voltage platform specification of the charging device is identified in advance. That is, the vehicle control module actively monitors the voltage value generated at the charging port connected to the charging device when the charging device performs insulation detection, and identifies the voltage platform specification of the charging device in advance. In some embodiments described above, based on the handshake stage and configuration stage of the electric vehicle charging process in the GB / T 27930-2015 communication protocol, a pre-charging control method under the double-gun direct-current charging scheme is proposed. The voltage specification of the charging machine is identified in advance, the pre-charging method is controllable and the root cause of the fault is quickly locked.

[0094] Further, the embodiments of the present application also provide a charging control device, which comprises a storage medium and a processor, the storage medium stores a computer program which is run by the processor, and the computer program, when being run by the processor, causes the processor to perform any of the charging control methods described above.

[0095] FIG. 6 shows a schematic block diagram of the charging control device 100 according to the embodiments of the present application. As shown in FIG. 6, the charging control device 100 according to the embodiments of the present application can comprise a storage medium 110 and a processor 120, the storage medium 110 stores a computer program which is run by the processor 120, and the computer program, when being run by the processor 120, causes the processor 120 to perform the charging control method according to the embodiments of the present application described above. Those skilled in the art can understand the specific operation of the charging control device 100 according to the embodiments of the present application in combination with the foregoing content, and for the sake of brevity, the details are not described here.

[0096] The storage medium 110 may, for example, include a memory card of a smart phone, a storage component of a tablet computer, a hard disk of a personal computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disc read-only memory (CD-ROM), a USB memory, or any combination of the above storage media. The computer-readable storage medium can be any combination of one or more computer-readable storage media.

[0097] Further, the embodiments of the present application also provide a vehicle, which comprises a charging port and any of the charging control devices described above.

[0098] The present application has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the present application to the scope of the described embodiments. Furthermore, those skilled in the art can understand that the present application is not limited to the above embodiments, and more various modifications and changes can be made according to the teachings of the present application, and these modifications and changes all fall within the scope of the present application claimed. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A charge control method characterized by, The method comprises: monitoring a first voltage at a charging port of a vehicle when a charging device is connected to the charging port and insulation detection is performed; determining an output voltage range of the charging device according to the first voltage.

2. The charge control method according to claim 1, wherein The monitoring of the first voltage at the charging port of the vehicle when the charging device is connected to the charging port and insulation detection is performed comprises: monitoring the first voltage at the charging port in real time after receiving a charger handshake message sent by the charging device.

3. The charge control method according to claim 1, wherein The determining of the output voltage range of the charging device according to the first voltage comprises: if the first voltage is not less than a first target voltage value and the duration is not less than a first target duration before receiving an identification signal request message sent by the charging device, determining that the output voltage range of the charging device is a first voltage range.

4. The charge control method according to any one of claims 1 to 3, characterized by, The determining of the output voltage range of the charging device according to the first voltage further comprises: if the first voltage is not less than a first target voltage value and the duration is less than a first target duration before receiving an identification signal request message sent by the charging device, determining that the output voltage range of the charging device is a second voltage range.

5. The charge control method according to claim 3 or 4, characterized by, The first target voltage value is the smaller one of a first reference value and a second reference value; wherein the first reference value is equal to a highest allowable charging voltage value of an on-board battery of the vehicle minus an allowable charging voltage difference, and the second reference value is determined based on the first voltage range and a voltage drop of an internal wire of the charging device.

6. The charge control method according to any one of claims 1 to 5, characterized by, The method further comprises: determining a current battery voltage of the on-board battery in a battery charging parameter message sent to the charging device according to the output voltage range of the charging device.

7. The charge control method according to claim 6, wherein The determining of the current battery voltage of the on-board battery in the battery charging parameter message sent to the charging device according to the output voltage range of the charging device comprises: if the output voltage range of the charging device is the first voltage range, taking an actual current battery voltage of the on-board battery as the current battery voltage of the on-board battery, wherein an upper limit value of the first voltage range is not less than the actual current battery voltage of the on-board battery.

8. The charge control method according to claim 7, wherein The determining of the current battery voltage of the on-board battery in the battery charging parameter message sent to the charging device according to the output voltage range of the charging device comprises: if the output voltage range of the charging device is the second voltage range, taking a second target voltage value as the current battery voltage of the on-board battery, wherein an upper limit value of the second voltage range is less than the actual current battery voltage of the on-board battery, and the second target voltage value is within the second voltage range.

9. The charge control method according to any one of claims 1 to 8, characterized by, The method further comprises: if the charging port does not support the charging device currently connected to charge the on-board battery of the vehicle, sending a charger voltage mismatch fault message.

10. The charge control method according to claim 9, wherein The method further comprises: When the output voltage range of the charging device is a second voltage range, if the charging port cannot be connected to the vehicle battery through a boost circuit, it is determined that the charging port does not support the charging device currently connected to charge the vehicle battery.

11. The charge control method according to any one of claims 1 to 11, characterized by, Also includes: After the charging device sequentially completes the insulation detection and the discharge voltage, the second voltage at the charging port is monitored. If the second voltage meets the pre-charge target condition, the vehicle battery performs pre-charge on the pre-charge device connected to the charging port.

12. The charge control method according to claim 11, wherein The second voltage at the charging port is monitored after the charging device sequentially completes the insulation detection and the discharge voltage, including: After receiving the charging machine maximum output capability message sent by the charging device, and determining that the charging port supports the charging device currently connected to charge the vehicle battery, the second voltage at the charging port is monitored.

13. The charge control method according to claim 11, wherein The second voltage at the charging port is monitored after the charging device sequentially completes the insulation detection and the discharge voltage, including: After receiving the identification signal feedback message sent by the charging device, the second voltage at the charging port is monitored; wherein the identification signal feedback message is sent by the charging device based on receiving the battery charging parameter message sent by the vehicle.

14. The charge control method according to claim 11, wherein If the second voltage does not meet the pre-charge prerequisite condition, a voltage abnormality fault message of the charging port is sent.

15. The charge control method according to claim 11, wherein The pre-charge prerequisite condition includes: During the monitoring process of the second target time, the second voltage is less than a third target voltage value and the duration is not less than a third target time; wherein the third target time is not greater than the second target time.

16. The charge control method according to claim 11, wherein The pre-charge of the vehicle battery on the pre-charge device connected to the charging port includes: When the charging port needs to charge the vehicle battery through a boost circuit, the pre-charge capacitor in the boost circuit is used as the pre-charge device, and the vehicle battery and the pre-charge capacitor are connected to enable the vehicle battery to pre-charge the pre-charge capacitor; Within the fourth target time of the vehicle battery pre-charging the pre-charge capacitor, if the voltage of the pre-charge capacitor and the current battery voltage of the vehicle battery in the battery charging parameter message meet the first preset condition and the duration is not less than the fifth target time, it is determined that the pre-charge of the pre-charge capacitor is completed; wherein the battery charging parameter message is sent by the vehicle to the charging device after receiving the identification signal feedback message sent by the charging device, and the fifth target time is not greater than the fourth target time.

17. The charge control method according to claim 16, wherein Within the fourth target time of the vehicle battery pre-charging the pre-charge capacitor, if the voltage of the pre-charge capacitor and the current battery voltage of the vehicle battery meet the first preset condition and the duration is less than the fifth target time, a pre-charge failure fault message is sent.

18. The charge control method according to claim 16, wherein The first preset condition includes: An absolute value of a difference between the current battery voltage of the vehicle-mounted battery and a voltage of the pre-charging capacitor is less than or equal to a first target voltage threshold. The executing the pre-charging of the vehicle-mounted battery of the vehicle to the pre-charging device connected to the charging port includes:

19. The charging control method according to claim 11, wherein When the charging port does not need to charge the vehicle-mounted battery through the boost circuit, taking a pre-charging resistor electrically connected to the charging port as the pre-charging device, and controlling the vehicle-mounted battery and the charging port to conduct through the pre-charging resistor, so that the vehicle-mounted battery pre-charges the pre-charging resistor; Within a sixth target time length of the pre-charging of the vehicle-mounted battery to the pre-charging resistor, if a voltage at the charging port and a current battery voltage of the vehicle-mounted battery in a battery charging parameter message satisfy a second preset condition and a duration is not less than a seventh target time length, it is determined that the pre-charging of the pre-charging resistor is completed, wherein the battery charging parameter message is sent by the vehicle to the charging device after receiving an identification signal feedback message sent by the charging device, and the seventh target time length is not greater than the sixth target time length. Within the sixth target time length of the pre-charging of the vehicle-mounted battery to the pre-charging resistor, if the voltage at the charging port and the current battery voltage of the vehicle-mounted battery satisfy the second preset condition and a duration is less than the seventh target time length, a pre-charging failure fault message is sent.

20. The charge control method according to claim 19, wherein The second preset condition includes:

21. The charge control method according to claim 19, wherein An absolute value of a difference between the current battery voltage of the vehicle-mounted battery and a voltage of the pre-charging capacitor is less than or equal to a second target voltage threshold. The executing the pre-charging of the vehicle-mounted battery of the vehicle to the pre-charging device connected to the charging port includes: When the charging port does not need to charge the vehicle-mounted battery through the boost circuit, taking a pre-charging resistor electrically connected to the charging port as the pre-charging device, and controlling the vehicle-mounted battery and the charging port to conduct through the pre-charging resistor, so that the vehicle-mounted battery pre-charges the pre-charging resistor; 22. A charge control device, characterized by comprising: Within a sixth target time length of the pre-charging of the vehicle-mounted battery to the pre-charging resistor, if a voltage at the charging port and a current battery voltage of the vehicle-mounted battery in a battery charging parameter message satisfy a second preset condition and a duration is not less than a seventh target time length, it is determined that the pre-charging of the pre-charging resistor is completed, wherein the battery charging parameter message is sent by the vehicle to the charging device after receiving an identification signal feedback message sent by the charging device, and the seventh target time length is not greater than the sixth target time length. Within the sixth target time length of the pre-charging of the vehicle-mounted battery to the pre-charging resistor, if the voltage at the charging port and the current battery voltage of the vehicle-mounted battery satisfy the second preset condition and a duration is less than the seventh target time length, a pre-charging failure fault message is sent.

23. A vehicle characterized by comprising: The second preset condition includes: An absolute value of a difference between the current battery voltage of the vehicle-mounted battery and a voltage of the pre-charging capacitor is less than or equal to a second target voltage threshold. The executing the pre-charging of the vehicle-mounted battery of the vehicle to the pre-charging device connected to the charging port includes: When the charging port does not need to charge the vehicle-mounted battery through the boost circuit, taking a pre-charging resistor electrically connected to the charging port as the pre-charging device, and controlling the vehicle-mounted battery and the charging port to conduct through the pre-charging resistor, so that the vehicle-mounted battery pre-charges the pre-charging resistor; Within a sixth target time length of the pre-charging of the vehicle-mounted battery to the pre-charging resistor, if a voltage at the charging port and a current battery voltage of the vehicle-mounted battery in a battery charging parameter message satisfy a second preset condition and a duration is not less than a seventh target time length, it is determined that the pre-charging of the pre-charging resistor is completed, wherein the battery charging parameter message is sent by the vehicle to the charging device after receiving an identification signal feedback message sent by the charging device, and the seventh target time length is not greater than the sixth target time length. Within the sixth target time length of the pre-charging of the vehicle-mounted battery to the pre-charging resistor, if the voltage at the charging port and the current battery voltage of the vehicle-mounted battery satisfy the second preset condition and a duration is less than the seventh target time length, a pre-charging failure fault message is sent. The second preset condition includes: An absolute value of a difference between the current battery voltage of the vehicle-mounted battery and a voltage of the pre-charging capacitor is less than or equal to a second target voltage threshold. The executing the pre-charging of the vehicle-mounted battery of the vehicle to the pre-charging device connected to the charging port includes: When the charging port does not need to charge the vehicle-mounted battery through the boost circuit, taking a pre-charging resistor electrically connected to the charging port as the pre-charging device, and controlling the vehicle-mounted battery and the charging port to conduct through the pre-charging resistor, so that the vehicle-mounted battery pre-charges the pre-charging resistor;

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