Charging switching method and device of electric vehicle and vehicle

Abstract

The invention relates to the technical field of automobiles, in particular to a charging switching method and device of an electric automobile and a vehicle. The method comprises the steps that when the vehicle and a target charging pile are in charging handshake, the first charging voltage and the second charging voltage of the vehicle are obtained; obtaining a first output voltage after the handshake succeeds; when the first output voltage is equal to the first charging voltage, the charging voltage of the vehicle is switched to the first charging voltage, and a first instruction is sent to the target charging pile; when the first output voltage is equal to the second charging voltage and the second output voltage is equal to the first output voltage, the charging voltage of the vehicle is switched to the second charging voltage, and a second instruction is sent to the target charging pile; according to the invention, the maximum output capability message can be sent twice after successful handshake, two-time interaction between the charging voltage of the vehicle and the output voltage of the target charging pile is realized, the vehicle is enabled to switch different charging voltages to adapt to different voltage platforms, the operation process is simple, and the operation time is short.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a charging switching method and device for an electric vehicle and a vehicle. Background Art

[0002] In order to reduce the power loss on electric vehicle cables and reduce the weight of cables, the application of 800V high-voltage systems is gradually increasing. Compared with the traditional 400V high-voltage system, the current of the 800V high-voltage system is smaller at the same power, so the heat loss is also smaller, and the cable is thinner and lighter.

[0003] In the traditional 400V electric vehicle market, both electric vehicles and charging piles are based on a 400V voltage platform. In order to make vehicles with an 800V voltage platform compatible with existing 400V voltage platform charging piles on the market, there are already many hardware circuit designs that can switch the 800V voltage platform to a 400V voltage platform, thereby achieving a match between the vehicle voltage platform and the charging pile voltage platform.

[0004] If a vehicle wants to achieve compatible charging between different voltage platforms, in addition to having a hardware device called a voltage conversion device, it also needs to have the ability to automatically identify the output voltage platform of the charging pile. That is, if the vehicle recognizes that the voltage output capacity of the charging pile is 400V, the voltage conversion device will switch the vehicle's voltage platform from 800V to 400V; if the vehicle recognizes that the voltage output capacity of the charging pile is 800V, the voltage output by the voltage conversion device will be the original voltage of the vehicle, 800V.

[0005] In the current DC charging standard, the voltage output capability of the charging pile as a technical parameter of the charging pile will be sent by the charging pile to the vehicle during the charging configuration phase, but before that, the vehicle needs to send the vehicle's charging voltage platform parameters to the charging pile in advance. Therefore, if the traditional DC charging method is used, the vehicle cannot identify the voltage output capability of the charging pile in advance to switch the corresponding mode of the voltage conversion device, and two handshake processes are required, which makes the workflow complicated and the operation time long.

[0006] Based on the shortcomings of the prior art, there is an urgent need to study a charging switching method, device and vehicle for an electric vehicle to solve the above problems. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a charging switching method, device and vehicle for an electric vehicle. After the vehicle successfully shakes hands with the target charging pile, the present invention can send the maximum output capacity message of the target charging pile twice, so as to realize two interactions between the charging voltage of the vehicle and the output voltage of the target charging pile, thereby enabling the vehicle to switch different charging voltages to adapt to different voltage platforms. This provides compatibility of electric vehicles with charging piles of various different voltage platforms, and the operation process is simple and the operation time is fast.

[0008] In a first aspect, the present invention discloses a charging switching method for an electric vehicle, which is applied to an electric vehicle, wherein the charging voltage of the electric vehicle includes a first charging voltage and a second charging voltage, wherein the first charging voltage is less than the second charging voltage, and the method includes:

[0009] Sending the first charging voltage to a target charging pile to obtain a first output voltage of the target charging pile, and comparing the first output voltage with the first charging voltage and the second charging voltage respectively;

[0010] If the first output voltage is equal to the second charging voltage, sending the second charging voltage to the target charging pile;

[0011] Receiving a maximum output capability message sent by the target charging pile, and determining a second output voltage of the target charging pile according to the maximum output capability message;

[0012] If the first output voltage is equal to the second output voltage, the charging voltage of the electric vehicle is switched to the second charging voltage, and a second instruction is sent to the target charging pile; the second instruction is used to instruct the target charging pile to charge the electric vehicle with the second output voltage.

[0013] Further, obtaining the first output voltage of the target charging pile includes:

[0014] Receiving a maximum output capacity message returned by the target charging pile for the first charging voltage;

[0015] A first output voltage is determined according to the maximum capability output message.

[0016] Furthermore, the method further includes: if the first output voltage is equal to the first charging voltage, sending the first charging voltage to the target charging pile again;

[0017] Receiving a maximum output capability message sent by the target charging pile, and determining a second output voltage of the target charging pile according to the maximum output capability message;

[0018] If the first output voltage is equal to the second output voltage, the charging voltage of the electric vehicle is switched to the first charging voltage, and a first instruction is sent to the target charging pile; the first instruction is used to instruct the target charging pile to charge the electric vehicle with the second output voltage.

[0019] Further,

[0020] If the first output voltage is equal to the second output voltage, switching the charging voltage of the electric vehicle to the first charging voltage, and sending a first instruction to the target charging pile comprises:

[0021] If the first output voltage is equal to the first charging voltage, sending the first charging voltage to the target charging pile again;

[0022] receiving a maximum output capability message sent by the target charging pile, and obtaining a third output voltage of the target charging pile according to the maximum output capability message;

[0023] If the third output voltage is equal to the first output voltage, the charging voltage of the electric vehicle is switched to the first charging voltage, and a first instruction is sent to a target charging pile.

[0024] Further, the switching of the charging voltage of the electric vehicle to the first charging voltage and sending a first instruction to the target charging pile includes:

[0025] According to the first output voltage of the target charging pile, the voltage conversion device is controlled to switch the charging voltage of the electric vehicle to a voltage platform compatible with the first output voltage, and a first instruction is sent to the target charging pile.

[0026] Furthermore, it also includes:

[0027] Obtain the usage status of each charging pile in the target charging station;

[0028] Based on the usage status, a reservation request is sent to a charging management platform, so that the charging management platform unlocks the smart ground lock to which the target charging pile belongs based on the reservation request, so that the target charging pile can perform a charging operation.

[0029] Furthermore, after sending the reservation request to the charging management platform based on the usage status, the method further includes:

[0030] Acquiring current location information of the electric vehicle;

[0031] Obtaining the location information of the target charging pile;

[0032] Prompt information is generated according to the location information of the target charging pile and the current location information, and the prompt information is used to display the path of the electric vehicle to the target charging pile.

[0033] Further, the first charging voltage ranges from 350V to 450V, the second charging voltage ranges from 700V to 800V, and the first charging voltage is a multiple of the second charging voltage.

[0034] Another aspect of the present invention provides a charging switching method for an electric vehicle, which is applied to a target charging pile, wherein the charging voltage of the electric vehicle includes a first charging voltage and a second charging voltage, wherein the first charging voltage is less than the second charging voltage, and the method includes:

[0035] Receiving a first charging voltage sent by the electric vehicle so that the electric vehicle obtains a first output voltage, and comparing the first output voltage with the first charging voltage and the second charging voltage respectively;

[0036] If the first output voltage is equal to the second charging voltage, receiving the second charging voltage sent by the electric vehicle again;

[0037] Sending a maximum output capability message to the electric vehicle, so that the electric vehicle determines the second output voltage of the target charging pile according to the maximum output capability message, and if the first output voltage is equal to the second output voltage, switching the charging voltage of the electric vehicle to the second charging voltage;

[0038] A second instruction sent by the electric vehicle is received, where the second instruction is used to instruct the target charging pile to charge the electric vehicle with the second output voltage.

[0039] Further, the receiving a first charging voltage sent by the electric vehicle so that the electric vehicle obtains a first output voltage includes:

[0040] Receiving a first charging voltage sent by the electric vehicle;

[0041] A maximum output capability message is returned to the electric vehicle with respect to the first charging voltage, so that the electric vehicle determines a first output voltage according to the maximum output capability message.

[0042] Furthermore, it also includes:

[0043] If the first output voltage is equal to the first charging voltage, receiving the first charging voltage sent by the target charging pile again;

[0044] Sending a maximum output capability message to the electric vehicle, so that the electric vehicle determines the second output voltage of the target charging pile according to the maximum output capability message, and if the first output voltage is equal to the second output voltage, switching the charging voltage of the electric vehicle to the first charging voltage;

[0045] A first instruction sent by the electric vehicle is received, where the first instruction is used to instruct the target charging pile to charge the electric vehicle with the second output voltage.

[0046] Furthermore, before receiving the first instruction sent by the electric vehicle, the method further includes:

[0047] If the first output voltage is equal to the first charging voltage, receiving the first charging voltage sent by the electric vehicle again;

[0048] The maximum output capability message is sent to the electric vehicle so that the electric vehicle obtains the third output voltage of the target charging pile according to the maximum output capability message. If the third output voltage is equal to the first output voltage, the charging voltage of the electric vehicle is switched to the first charging voltage.

[0049] Furthermore, it also includes:

[0050] The usage status of the target charging pile is sent to the electric vehicle, so that the electric vehicle sends a reservation request to the charging management platform based on the usage status, so that the charging management platform unlocks the smart ground lock to which the target charging pile belongs based on the reservation request, so that the target charging pile can perform charging operations.

[0051] Another aspect of the present invention is to protect a charging switching device for an electric vehicle, which is applied to the electric vehicle, and is characterized in that the charging voltage of the electric vehicle includes a first charging voltage and a second charging voltage, the first charging voltage is less than the second charging voltage, and the device includes:

[0052] A first message sending module, used for sending a first charging voltage to a target charging pile to obtain a first output voltage of the target charging pile;

[0053] A comparison module, used for comparing the first output voltage with a first charging voltage and a second charging voltage respectively;

[0054] The first message sending module is used to send the second charging voltage to the target charging pile if the first output voltage is equal to the second charging voltage;

[0055] A first message receiving module, configured to receive a maximum output capability message sent by the target charging pile, and determine a second output voltage of the target charging pile according to the maximum output capability message;

[0056] An execution module is used to switch the charging voltage of the electric vehicle to the second charging voltage if the first output voltage is equal to the second output voltage, and send a second instruction to the target charging pile; the second instruction is used to instruct the target charging pile to charge the electric vehicle with the second output voltage.

[0057] Another aspect of the present invention is to protect a charging switching device for an electric vehicle, which is applied to a target charging pile, wherein the charging voltage of the electric vehicle includes a first charging voltage and a second charging voltage, wherein the first charging voltage is less than the second charging voltage, and the device includes:

[0058] A second message receiving module is used to receive a first charging voltage sent by the electric vehicle, so that the electric vehicle obtains a first output voltage, and compares the first output voltage with the first charging voltage and the second charging voltage respectively;

[0059] The second message receiving module is further configured to receive the second charging voltage sent by the electric vehicle again if the first output voltage is equal to the second charging voltage;

[0060] a second message sending module, configured to send a maximum output capability message to the electric vehicle, so that the electric vehicle determines a second output voltage of the target charging pile according to the maximum output capability message, and switches the charging voltage of the electric vehicle to the second charging voltage if the first output voltage is equal to the second output voltage;

[0061] The second message receiving module is further used to receive a second instruction sent by the electric vehicle, where the second instruction is used to instruct the target charging pile to charge the electric vehicle with the second output voltage.

[0062] Another aspect of the present invention protects a vehicle, using the charging switching device of the electric vehicle as described above.

[0063] Implementing the embodiments of the present invention has the following beneficial effects:

[0064] After the vehicle and the target charging pile successfully shake hands, the present invention can send the maximum output capacity message of the target charging pile twice, so as to realize two interactions between the charging voltage of the vehicle and the output voltage of the target charging pile, thereby enabling the vehicle to switch different charging voltages to adapt to different voltage platforms. This provides compatibility between electric vehicles and charging piles of various different voltage platforms, and the operation process is simple and the operation time is fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments or prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0066] Figure 1 This is a flow chart of the charging switching method for the electric vehicle described in this embodiment;

[0067] Figure 2 It is a structural diagram of the charging switching system of the electric vehicle described in this embodiment.

[0068] Among them, the reference numerals in the figure correspond to:

[0069] 1-acquisition module; 2-message sending module; 3-message receiving module; 4-comparison module; 5-execution module; 6-voltage conversion module. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0071] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0072] The existing technology has the following disadvantages: In the current DC charging standard, the voltage output capacity of the charging pile as a technical parameter of the charging pile will be sent by the charging pile to the vehicle during the charging configuration stage, but before that, the vehicle needs to send the vehicle's charging voltage platform parameters to the charging pile in advance. Therefore, if the traditional DC charging method is used, the vehicle cannot identify the voltage output capacity of the charging pile in advance to switch the corresponding mode of the voltage conversion device, and two handshake processes are required, which makes the workflow complicated and the operation time long.

[0073] In view of the defects of the prior art, the present invention can send the maximum output capacity message of the target charging pile twice after the vehicle and the target charging pile successfully shake hands, so as to realize two interactions between the charging voltage of the vehicle and the output voltage of the target charging pile, and then enable the vehicle to switch different charging voltages to adapt to different voltage platforms. This provides compatibility of electric vehicles with charging piles of various different voltage platforms, and the operation process is simple and the operation time is fast.

[0074] Example 1

[0075] See attached Figure 1-2 , this embodiment provides a charging switching method for an electric vehicle, comprising:

[0076] S1: When the vehicle and the target charging pile are in handshake, a first charging voltage and a second charging voltage of the vehicle are obtained; wherein the first charging voltage is the maximum charging voltage under the first charging circuit, and the second charging voltage is the maximum charging voltage under the second charging circuit;

[0077] S2: After the vehicle and the target charging pile have successfully completed the charging handshake, the first output voltage of the target charging pile is obtained;

[0078] S3: Compare the first output voltage with the first charging voltage and the second charging voltage respectively;

[0079] S4: When the first output voltage is equal to the first charging voltage, the charging voltage of the vehicle is switched to the first charging voltage, and a first instruction is sent to the target charging pile; the first instruction is used to control the target charging pile to charge the vehicle with the first output voltage;

[0080] S5: When the first output voltage is equal to the second charging voltage, the second charging voltage is sent to the target charging pile, the maximum output capacity message sent by the target charging pile is received, and the second output voltage of the target charging pile is obtained according to the maximum output capacity message; it is determined whether the second output voltage is equal to the first output voltage, and when the second output voltage is equal to the first output voltage, the charging voltage of the vehicle is switched to the second charging voltage, and a second instruction is sent to the target charging pile; the second instruction is used to control the target charging pile to charge the vehicle with the second output voltage.

[0081] It should be noted that: in this embodiment, after the vehicle and the target charging pile have successfully handshaked, the maximum output capacity message of the target charging pile can be sent twice, so that the charging voltage of the vehicle and the output voltage of the target charging pile can interact twice, and then the vehicle can switch different charging voltages to adapt to different voltage platforms, which provides compatibility between electric vehicles and charging piles of various different voltage platforms, and the operation process is simple and the operation time is fast. In addition, the vehicle in this embodiment has a low voltage platform and a high voltage platform. When the output capacity of the charging pile is fixed, the charging efficiency of the electric vehicle is maximized by automatically identifying the voltage output capacity of the charging pile and matching the corresponding voltage platform for charging.

[0082] It should also be noted that: the first charging voltage is defined as a low voltage platform, and the second charging voltage is defined as a high voltage platform; in this embodiment, 400V is a low voltage platform, and 800V is a high voltage platform; in this embodiment, by switching the first charging circuit and the second charging circuit, the switching between the low voltage platform and the high voltage platform can be achieved. When switching to the first charging circuit, it corresponds to the low voltage platform, and when switching to the second charging circuit, it corresponds to the high voltage platform.

[0083] It is also necessary to explain that: after the charging pile receives the highest allowable charging voltage (BCP) signal sent by the vehicle, it will return the maximum output capacity (CML) of the current charging pile. If the signal feedback charging capacity in the CML received for the first time is a low voltage platform, then the BCP signal of the low voltage platform is used for the second time. This operation is equivalent to repeatedly confirming the charging capacity of the charging pile; if the signal feedback charging capacity of the CML received for the first time is a high voltage platform, then the high voltage (BCP) signal is used for the second time, and the charging pile returns the CML signal for the second time. Then, based on the interaction of the BCP and CML signals these two times, the vehicle can accurately know the charging capacity of the charging pile without violating the charging protocol. Next, the vehicle will send the charging readiness message (BRO) of the vehicle according to the actual capacity (CML) of the charger.

[0084] For example, the vehicle first sends the maximum allowable charging voltage (BCP) of 400V, and the maximum output capacity (CML) of the charging pile is 400V, which means that the output capacity of the charging pile is 400V, then charging starts according to the 400V voltage platform.

[0085] Similarly, if the vehicle first sends the highest allowable charging voltage (BCP) of 400V, and the maximum output capacity (CML) of the charging pile is 800V, it means that the output capacity of the charging pile is 800V, then charging will start according to the 800V voltage platform. In this way, electric vehicles with an 800V voltage platform can automatically identify the voltage output capacity of the charger without the need for human intervention, and combined with the voltage conversion device, vehicles with an 800V voltage platform can be compatible with 400V or 800V charging piles.

[0086] Preferably, the obtaining of the first charging voltage and the second charging voltage of the vehicle comprises:

[0087] Sending the first charging voltage as a vehicle handshake message to the target charging pile;

[0088] Receive a handshake success message sent by the target charging pile according to the vehicle handshake message, and obtain handshake success information according to the handshake success message.

[0089] Preferably, obtaining the first output voltage of the target charging pile after the vehicle and the target charging pile have successfully completed the charging handshake comprises:

[0090] When the vehicle successfully shakes hands with the target charging pile, the vehicle receives the maximum output capacity message sent by the target charging pile;

[0091] The first output voltage of the target charging pile is obtained according to the received maximum output capacity message; wherein the first output voltage is the maximum output voltage of the target charging pile.

[0092] Preferably, when the first output voltage is equal to the first charging voltage, switching the charging voltage of the vehicle to the first charging voltage and sending a first instruction to the target charging pile includes:

[0093] When the first output voltage is equal to the first charging voltage, the first charging voltage is sent to the target charging pile; the maximum output capacity message sent by the target charging pile is received, and the third output voltage of the target charging pile is obtained according to the maximum output capacity message; it is determined whether the third output voltage is equal to the first output voltage, and when the third output voltage is equal to the first output voltage, the charging voltage of the vehicle is switched to the first charging voltage, and a first instruction is sent to the target charging pile.

[0094] Preferably, the step of switching the charging voltage of the vehicle to the first charging voltage and sending the first instruction to the target charging pile includes:

[0095] According to the first output voltage of the target charging pile, controlling the voltage conversion device to switch the charging voltage of the vehicle to a voltage platform adapted to the first output voltage;

[0096] The first instruction is sent to the target charging pile.

[0097] In some possible embodiments, switching the charging voltage of the vehicle to a second charging voltage and sending a second instruction to the target charging pile includes:

[0098] According to the second output voltage of the target charging pile, the voltage conversion device is controlled to switch the charging voltage of the vehicle to a voltage platform that is compatible with the second output voltage of the target charging pile; and a second instruction is sent to the target charging pile.

[0099] Preferably, when the vehicle and the target charging pile are performing a charging handshake, obtaining the first charging voltage and the second charging voltage of the vehicle, and sending the first charging voltage as a vehicle handshake message to the target charging pile also includes:

[0100] Obtain the usage status of each charging pile in the target charging station;

[0101] Sending a reservation request to a charging management platform based on the usage status, wherein the reservation request indicates a request to reserve a target charging pile in the target charging station;

[0102] The charging management platform unlocks the smart ground lock to which the target charging pile belongs based on the reservation request, so that the target charging pile can perform a charging operation.

[0103] Preferably, the sending of a reservation request to a charging management platform based on the usage status, wherein the reservation request indicates a request to reserve a target charging pile in the target charging station, further comprises:

[0104] Get the current location information of the vehicle;

[0105] Obtaining the location information of the target charging pile;

[0106] Prompt information is generated according to the location information of the target charging pile and the current location information, and the prompt information is used to display the path of the vehicle to the target charging pile.

[0107] Preferably, the first charging voltage is in a range of 350V to 450V, the second charging voltage is in a range of 700V to 800V, and the first charging voltage is in a multiple relationship with the second charging voltage.

[0108] In this embodiment, the first charging voltage is 400V, and the second charging voltage is 800V; it should be noted that: in order to reduce the power loss on the electric vehicle cable and reduce the weight of the cable, the application of the 800V high-voltage system is gradually increasing. Compared with the traditional 400V high-voltage system, the current of the 800V high-voltage system is smaller at the same power, so the heat loss is smaller, and the cable is thinner and lighter. In the traditional 400V electric vehicle market, both electric vehicles and charging piles are 400V voltage platforms. In order to make the 800V voltage platform vehicle compatible with the existing 400V voltage platform charging piles on the market, there are already many hardware circuit designs that can realize the 800V voltage platform switching to the 400V voltage platform, thereby achieving the matching of the vehicle voltage platform and the charging pile voltage platform.

[0109] In this embodiment, the specific steps of the charging switching method of the electric vehicle are:

[0110] S0: Obtain the usage status of each charging pile in the target charging station; send a reservation request to the charging management platform based on the usage status, the reservation request indicating a request to reserve the target charging pile in the target charging station; obtain the current location information of the vehicle; obtain the location information of the target charging pile; generate prompt information based on the location information of the target charging pile and the current location information, the prompt information is used to show the path of the vehicle to the target charging pile; the charging management platform unlocks the smart ground lock to which the target charging pile belongs based on the reservation request, so that the target charging pile can perform charging operations;

[0111] S1: When the vehicle and the target charging pile are in handshake, a first charging voltage and a second charging voltage of the vehicle are obtained; wherein the first charging voltage is the maximum charging voltage under the first charging circuit, and the second charging voltage is the maximum charging voltage under the second charging circuit;

[0112] S2: After the vehicle and the target charging pile have successfully completed the charging handshake, the first output voltage of the target charging pile is obtained;

[0113] S3: Compare the first output voltage with the first charging voltage and the second charging voltage respectively;

[0114] S4: When the first output voltage is equal to the first charging voltage, the charging voltage of the vehicle is switched to the first charging voltage, and a first instruction is sent to the target charging pile; the first instruction is used to control the target charging pile to charge the vehicle with the first output voltage;

[0115] S5: When the first output voltage is equal to the second charging voltage, the second charging voltage is sent to the target charging pile, the maximum output capacity message sent by the target charging pile is received, and the second output voltage of the target charging pile is obtained according to the maximum output capacity message; it is determined whether the second output voltage is equal to the first output voltage, and when the second output voltage is equal to the first output voltage, the charging voltage of the vehicle is switched to the second charging voltage, and a second instruction is sent to the target charging pile; the second instruction is used to control the target charging pile to charge the vehicle with the second output voltage.

[0116] The specific steps of the charging switching method of the electric vehicle (wherein the low voltage platform is 400V and the high voltage platform is 800V):

[0117] The vehicle sends the current maximum charging voltage of 400V to the charging pile;

[0118] Receive the maximum charging capacity signal fed back by the charging pile;

[0119] Determine the maximum charging platform of the charging pile according to the maximum charging capacity signal (i.e. determine whether the charging pile is a 400V platform or an 800V platform);

[0120] If the maximum output capacity of the charging pile is also 400V, the vehicle sends the maximum charging voltage of 400V to the charging pile again, and receives the maximum charging capacity fed back by the charging pile. If the maximum charging capacity is still 400V, it is confirmed that the configuration process of the external 400V charging pile has been completed.

[0121] If the maximum output capacity of the charging pile is 800V, the vehicle sends a maximum charging voltage of 800V to the charging pile again; the maximum charging capacity fed back by the charging pile is received. If the maximum charging capacity is 800V, the configuration process of the external 800V charging pile has been confirmed to be completed;

[0122] Start the voltage conversion device, adjust the vehicle's voltage to be consistent with the voltage of the external charging pile, and control the charging pile to charge the vehicle.

[0123] Another aspect of the present invention is to protect a charging switching system for an electric vehicle, which uses the charging switching method for an electric vehicle as described above. The system includes an acquisition module 1, a message sending module 2, a message receiving module 3, a comparison module 4 and an execution module 5. The message sending module 2 is electrically connected to the acquisition module 1 and the message receiving module 3 respectively, and the comparison module 4 is electrically connected to the message receiving module 3 and the execution module 5 respectively:

[0124] An acquisition module 1 is used to acquire a first charging voltage and a second charging voltage of a vehicle;

[0125] A message sending module 2, configured to send the first charging voltage and the second charging voltage to the target charging pile when the vehicle and the target charging pile are handshaking;

[0126] The message receiving module 3 is used to receive the handshake success message sent by the target charging pile according to the vehicle handshake message; when the vehicle and the target charging pile have successfully shaken hands, receive the maximum output capacity message sent by the target charging pile, and obtain the first output voltage or the second output voltage of the target charging pile according to the received maximum output capacity message;

[0127] A comparison module 4, used for comparing the first output voltage with the first charging voltage and the second charging voltage respectively;

[0128] Execution module 5 is used for switching the charging voltage of the vehicle to the first charging voltage and sending a first instruction to the target charging pile when the first output voltage is equal to the first charging voltage; the first instruction is used to control the target charging pile to charge the vehicle with the third output voltage; when the first output voltage is equal to the second charging voltage, and the second output voltage is equal to the first output voltage, the charging voltage of the vehicle is switched to the second charging voltage and a second instruction is sent to the target charging pile; the second instruction is used to control the target charging pile to charge the vehicle with the second output voltage.

[0129] Preferably, the charging switching system of the electric vehicle further comprises a voltage conversion module 6, and the voltage conversion module 6 is electrically connected to the execution module 5;

[0130] The voltage conversion module 6 is used to control the voltage conversion device to switch the vehicle's charging voltage to a voltage platform that matches the second output voltage of the target charging pile according to the second output voltage of the target charging pile; or to control the voltage conversion device to switch the vehicle's charging voltage to a voltage platform that matches the third output voltage of the target charging pile according to the third output voltage of the target charging pile.

[0131] On the other hand, the present invention protects a vehicle, which uses a charging switching system for an electric vehicle as described above. After the vehicle successfully shakes hands with the target charging pile, the vehicle with the charging switching system can send the maximum output capacity message of the target charging pile twice, so as to achieve two interactions between the charging voltage of the vehicle and the output voltage of the target charging pile, thereby enabling the vehicle to switch different charging voltages to adapt to different voltage platforms, which provides compatibility between electric vehicles and charging piles of various different voltage platforms, and the operation process is simple and the operation time is fast. In addition, the vehicle has a low voltage platform and a high voltage platform. When the output capacity of the charging pile is fixed, the charging efficiency of the electric vehicle is maximized by automatically identifying the voltage output capacity of the charging pile and matching the corresponding voltage platform for charging.

[0132] Although the present invention has been described through preferred embodiments, the present invention is not limited to the embodiments described herein but includes various changes and modifications that may be made without departing from the scope of the present invention.

[0133] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0134] In the absence of conflict, the above embodiments and features in the embodiments can be combined with each other.

[0135] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A charging switching method for an electric vehicle, applied to the electric vehicle, characterized in that: The charging voltage of the electric vehicle includes a first charging voltage and a second charging voltage, the first charging voltage is less than the second charging voltage, and the method includes: Sending the first charging voltage to a target charging pile to obtain a first output voltage of the target charging pile, and comparing the first output voltage with the first charging voltage and the second charging voltage respectively; If the first output voltage is equal to the second charging voltage, sending the second charging voltage to the target charging pile; Receiving a maximum output capability message sent by the target charging pile, and determining a second output voltage of the target charging pile according to the maximum output capability message; If the first output voltage is equal to the second output voltage, the charging voltage of the electric vehicle is switched to the second charging voltage, and a second instruction is sent to the target charging pile; the second instruction is used to instruct the target charging pile to charge the electric vehicle with the second output voltage.

2. The method according to claim 1, characterized in that The obtaining of the first output voltage of the target charging pile comprises: Receiving a maximum output capacity message returned by the target charging pile for the first charging voltage; A first output voltage is determined according to the maximum capability output message.

3. The method according to claim 1, characterized in that Also includes: If the first output voltage is equal to the first charging voltage, sending the first charging voltage to the target charging pile again; Receiving a maximum output capability message sent by the target charging pile, and determining a second output voltage of the target charging pile according to the maximum output capability message; If the first output voltage is equal to the second output voltage, the charging voltage of the electric vehicle is switched to the first charging voltage, and a first instruction is sent to the target charging pile; the first instruction is used to instruct the target charging pile to charge the electric vehicle with the second output voltage.

4. The method according to claim 3, characterized in that If the first output voltage is equal to the second output voltage, switching the charging voltage of the electric vehicle to the first charging voltage, and sending a first instruction to the target charging pile comprises: If the first output voltage is equal to the first charging voltage, sending the first charging voltage to the target charging pile again; receiving a maximum output capability message sent by the target charging pile, and obtaining a third output voltage of the target charging pile according to the maximum output capability message; If the third output voltage is equal to the first output voltage, the charging voltage of the electric vehicle is switched to the first charging voltage, and a first instruction is sent to a target charging pile.

5. The method according to claim 4, characterized in that The step of switching the charging voltage of the electric vehicle to the first charging voltage and sending a first instruction to the target charging pile includes: According to the first output voltage of the target charging pile, the voltage conversion device is controlled to switch the charging voltage of the electric vehicle to a voltage platform compatible with the first output voltage, and a first instruction is sent to the target charging pile.

6. The method according to any one of claims 1 to 5, characterized in that Also includes: Obtain the usage status of each charging pile in the target charging station; Based on the usage status, a reservation request is sent to a charging management platform, so that the charging management platform unlocks the smart ground lock to which the target charging pile belongs based on the reservation request, so that the target charging pile can perform a charging operation.

7. The method according to claim 6, characterized in that After sending the reservation request to the charging management platform based on the usage status, the method further includes: Acquiring current location information of the electric vehicle; Obtaining the location information of the target charging pile; Prompt information is generated according to the location information of the target charging pile and the current location information, and the prompt information is used to display the path of the electric vehicle to the target charging pile.

8. The method according to claim 1, characterized in that The first charging voltage ranges from 350V to 450V, the second charging voltage ranges from 700V to 800V, and the first charging voltage is a multiple of the second charging voltage.

9. A charging switching method for an electric vehicle, applied to a target charging pile, characterized in that: The charging voltage of the electric vehicle includes a first charging voltage and a second charging voltage, the first charging voltage is less than the second charging voltage, and the method includes: Receiving a first charging voltage sent by the electric vehicle so that the electric vehicle obtains a first output voltage, and comparing the first output voltage with the first charging voltage and the second charging voltage respectively; If the first output voltage is equal to the second charging voltage, receiving the second charging voltage sent by the electric vehicle again; Sending a maximum output capability message to the electric vehicle, so that the electric vehicle determines the second output voltage of the target charging pile according to the maximum output capability message, and if the first output voltage is equal to the second output voltage, switching the charging voltage of the electric vehicle to the second charging voltage; A second instruction sent by the electric vehicle is received, where the second instruction is used to instruct the target charging pile to charge the electric vehicle with the second output voltage.

10. The method according to claim 9, characterized in that The receiving of the first charging voltage sent by the electric vehicle so that the electric vehicle obtains a first output voltage comprises: Receiving a first charging voltage sent by the electric vehicle; A maximum output capability message is returned to the electric vehicle with respect to the first charging voltage, so that the electric vehicle determines a first output voltage according to the maximum output capability message.

11. The method according to claim 9, characterized in that Also includes: If the first output voltage is equal to the first charging voltage, receiving the first charging voltage sent by the target charging pile again; Sending a maximum output capability message to the electric vehicle, so that the electric vehicle determines the second output voltage of the target charging pile according to the maximum output capability message, and if the first output voltage is equal to the second output voltage, switching the charging voltage of the electric vehicle to the first charging voltage; A first instruction sent by the electric vehicle is received, where the first instruction is used to instruct the target charging pile to charge the electric vehicle with the second output voltage.

12. The method according to claim 9, characterized in that Before receiving the first instruction sent by the electric vehicle, the method further includes: If the first output voltage is equal to the first charging voltage, receiving the first charging voltage sent by the electric vehicle again; The maximum output capability message is sent to the electric vehicle so that the electric vehicle obtains the third output voltage of the target charging pile according to the maximum output capability message. If the third output voltage is equal to the first output voltage, the charging voltage of the electric vehicle is switched to the first charging voltage.

13. The method according to any one of claims 9 to 12, characterized in that Also includes: The usage status of the target charging pile is sent to the electric vehicle, so that the electric vehicle sends a reservation request to the charging management platform based on the usage status, so that the charging management platform unlocks the smart ground lock to which the target charging pile belongs based on the reservation request, so that the target charging pile can perform charging operations.

14. A charging switching device for an electric vehicle, applied to the electric vehicle, characterized in that: The charging voltage of the electric vehicle includes a first charging voltage and a second charging voltage, the first charging voltage is less than the second charging voltage, and the device includes: A first message sending module, used for sending a first charging voltage to a target charging pile to obtain a first output voltage of the target charging pile; A comparison module, used for comparing the first output voltage with a first charging voltage and a second charging voltage respectively; The first message sending module is used to send the second charging voltage to the target charging pile if the first output voltage is equal to the second charging voltage; A first message receiving module, configured to receive a maximum output capability message sent by the target charging pile, and determine a second output voltage of the target charging pile according to the maximum output capability message; An execution module is used to switch the charging voltage of the electric vehicle to the second charging voltage if the first output voltage is equal to the second output voltage, and send a second instruction to the target charging pile; the second instruction is used to instruct the target charging pile to charge the electric vehicle with the second output voltage.

15. A charging switching device for an electric vehicle, applied to a target charging pile, characterized in that: The charging voltage of the electric vehicle includes a first charging voltage and a second charging voltage, the first charging voltage is less than the second charging voltage, and the device includes: A second message receiving module is used to receive a first charging voltage sent by the electric vehicle, so that the electric vehicle obtains a first output voltage, and compares the first output voltage with the first charging voltage and the second charging voltage respectively; The second message receiving module is further configured to receive the second charging voltage sent by the electric vehicle again if the first output voltage is equal to the second charging voltage; a second message sending module, configured to send a maximum output capability message to the electric vehicle, so that the electric vehicle determines a second output voltage of the target charging pile according to the maximum output capability message, and switches the charging voltage of the electric vehicle to the second charging voltage if the first output voltage is equal to the second output voltage; The second message receiving module is further used to receive a second instruction sent by the electric vehicle, where the second instruction is used to instruct the target charging pile to charge the electric vehicle with the second output voltage.

16. A vehicle, characterized in that: A charging switching device for an electric vehicle as described in claim 15 is used.

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