Charging Method, Device, Storage Medium and Vehicle

Abstract

The present disclosure relates to a charging method, device, storage medium and vehicle, which is used to determine the maximum output power of a charging pile during the charging process of a vehicle, so that the maximum output power of the charging pile can be utilized to operate stably during boost charging. The charging method includes: determining an initial required power, where the initial required power is less than the required power at the vehicle battery terminal and less than the maximum boost power of the vehicle's boost DCDC converter; on the basis of the initial required power, requesting to increase the charging output power of an external charging device connected to the vehicle through a preset increase method, and determining the maximum output power of the external charging device by the voltage change condition of the vehicle's charging port after each increase in the charging output power of the external charging device; requesting the external charging device to charge the vehicle in a constant voltage mode according to the maximum output power.

Description

Technical Field

[0001] The present disclosure relates to the field of electric vehicles, and in particular, to a charging method, device, storage medium, and vehicle. Background Art

[0002] Current electric vehicle charging piles have different voltage platforms. In order to enable electric vehicles to be compatible with and identify charging piles of different voltage platforms, and to improve the charging speed, electric vehicles usually have a boost charging function. For example, the voltage of a 500V voltage platform or a 750V voltage platform is boosted to 800V to charge the power battery.

[0003] In the related art, the boost charging of electric vehicles generally adopts a constant current mode, that is, the vehicle obtains the maximum charging current of the charging pile during message interaction, and then requests the charging pile to output the maximum charging current at a constant current. Moreover, the boost DCDC converter in the boost module also operates in a constant current mode to constantly output the current request value at the battery terminal. And during the charging process, the boost module, the power battery, and the high-voltage accessories on the electric vehicle are all loads of the charging pile. As the power of the load of the charging pile changes, it is also necessary to adjust the power of the boost DCDC converter to ensure the voltage stability of the charging port. Summary of the Invention

[0004] To overcome the problems in the related art, the present disclosure provides a charging method, device, storage medium, and vehicle.

[0005] According to a first aspect of an embodiment of the present disclosure, a charging method is provided, including:

[0006] Determine an initial required power, where the initial required power is less than the required power at the vehicle battery terminal and less than the maximum boost power of the boost DCDC converter of the vehicle;

[0007] On the basis of the initial required power, request to increase the charging output power of an external charging device connected to the vehicle through a preset increase method, and determine the maximum output power of the external charging device based on the voltage change of the vehicle's charging port after each increase in the charging output power of the external charging device;

[0008] Request the external charging device to charge the vehicle in a constant voltage mode according to the maximum output power.

[0009] Optionally, the step of on the basis of the initial required power, requesting to increase the charging output power of an external charging device connected to the vehicle through a preset increase method, and determining the maximum output power of the external charging device based on the voltage change of the vehicle's charging port after each increase in the charging output power of the external charging device includes:

[0010] Request to increase the initial required power according to the said increasing method to obtain a first output power;

[0011] Request the external charging device to charge the vehicle in a constant voltage mode according to the first output power, and determine a first voltage of the charging port;

[0012] Determine whether the first voltage is less than a preset voltage threshold;

[0013] In the case where it is determined that the first voltage is less than the voltage threshold, determine the initial required power as the maximum output power.

[0014] Optionally, it further includes:

[0015] In the case where it is determined that the first voltage is greater than or equal to the voltage threshold, request to increase the first output power according to the said increasing method to obtain a second output power;

[0016] Request the external charging device to charge the vehicle in a constant voltage mode according to the second output power, and determine a second voltage of the charging port;

[0017] Determine whether the second voltage is less than the voltage threshold;

[0018] In the case where it is determined that the second voltage is less than the voltage threshold, determine the second output power as the maximum output power.

[0019] Optionally, the step of, in the case where it is determined that the first voltage is less than the voltage threshold, determining the initial required power as the maximum output power, includes:

[0020] Request the external charging device to charge the vehicle in a constant voltage mode according to the initial required power, and determine a third voltage of the charging port;

[0021] Determine whether the third voltage is less than the voltage threshold;

[0022] In the case where it is determined that the third voltage is greater than or equal to the voltage threshold, determine the initial required power as the maximum output power of the external charging device.

[0023] Optionally, it further includes:

[0024] In the case where it is determined that the third voltage is less than the voltage threshold, request to decrease the initial required power through a preset decreasing method to obtain a third output power;

[0025] Request the external charging device to charge the vehicle in constant voltage mode according to the third output power, and determine the fourth voltage of the charging port;

[0026] Determine whether the fourth voltage is less than the voltage threshold;

[0027] In the case where it is determined that the fourth voltage is greater than or equal to the voltage threshold, determine the initial required power as the maximum output power.

[0028] Optionally, it further includes:

[0029] Determine whether the voltage of the charging port is derated;

[0030] In the case where the voltage of the charging port is derated, adjust the maximum output power to obtain an adjusted maximum output power;

[0031] Request the external charging device to charge the vehicle in constant voltage mode according to the adjusted maximum output power.

[0032] Optionally, the adjusting the maximum output power to obtain an adjusted maximum output power in the case where the voltage of the charging port is derated includes:

[0033] Determine the voltage difference when the voltage is derated;

[0034] Calculate a derating coefficient according to the voltage difference and a preset voltage threshold;

[0035] Determine the product of the maximum output power and the derating coefficient as the derated maximum output power.

[0036] According to the second aspect of the embodiments of the present disclosure, a charging device is provided, including:

[0037] A first determination module configured to determine an initial required power, where the initial required power is less than the required power at the vehicle battery end and less than the maximum boost power of the boost DCDC converter of the vehicle;

[0038] A second determination module configured to, based on the initial required power, request to increase the charging output power of an external charging device connected to the vehicle by a preset boosting method, and determine the maximum output power of the external charging device according to the voltage change of the charging port of the vehicle after each increase in the charging output power of the external charging device;

[0039] A charging module configured to request the external charging device to charge the vehicle in constant voltage mode according to the maximum output power.

[0040] According to a third aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium having computer program instructions stored thereon, and when the program instructions are executed by a processor, the steps of the charging method provided in the first aspect of the present disclosure are implemented.

[0041] According to a fourth aspect of the embodiments of the present disclosure, there is provided a vehicle, including:

[0042] a memory having a computer program stored thereon;

[0043] a processor configured to execute the computer program in the memory to implement the steps of the method in the first aspect.

[0044] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: Based on an initial demand power that is less than the demand power at the vehicle battery end and less than the maximum boost power of the boost DCDC converter of the vehicle, a request is made to increase the charging output power of an external charging device connected to the vehicle through a preset boosting method, and after each increase in the charging output power of the external charging device, the voltage change situation of the charging port of the vehicle is used to determine the maximum output power of the external charging device, and the external charging device is requested to charge the vehicle in a constant voltage mode according to the maximum output power. In this way, the maximum output power of the external charging device can be determined during the vehicle charging process, enabling the external charging device to operate stably at its maximum output power during boost charging. And, since the external charging device operates in a constant voltage mode, the stability of the voltage at the charging port is ensured. In this way, for the boost DCDC converter, it only needs to output the charging current according to the requested value at the vehicle battery end, and there is no need to adjust the power to keep the voltage at the charging port stable, simplifying the control logic of the boost DCDC converter.

[0045] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure and used together with the specification to explain the principles of the present disclosure.

[0047] Figure 1 is an architecture diagram of an 800V platform electric vehicle shown according to an exemplary embodiment.

[0048] Figure 2 is a schematic diagram of boost charging energy flow shown according to an exemplary embodiment.

[0049] Figure 3 is a simplified schematic diagram of boost charging shown according to an exemplary embodiment.

[0050] Figure 4 is a flowchart of a charging method shown according to an exemplary embodiment.

[0051] Figure 5 is a flowchart of a charging method shown according to another exemplary embodiment.

[0052] Figure 6 is a block diagram of a charging device shown according to an exemplary embodiment.

[0053] Figure 7 is a block diagram of an electronic device shown according to an exemplary embodiment. Detailed implementation manners

[0054] Here, the exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0055] The inventors' research found that in the related art, boost charging generally adopts a constant current mode, that is, the vehicle obtains the maximum charging current of the charging pile during message interaction. For example, an electric vehicle on an 800V platform requests a constant current mode from a 500V / 750V charging pile, with the voltage as the protection value and the current as the request value. Also, the boost DCDC converter operates in a constant current mode. And because the boost DCDC converter needs to have the ability to stabilize the voltage at the charging port at a specified value during boosting, during boost charging, in addition to the output side voltage of the boost DCDC converter being limited by the high-voltage battery voltage, the input side voltage of the boost DCDC converter is also limited by the specified value of the charging port voltage. Therefore, during the charging process, as the power of the load of the charging pile changes, where the power of the load of the charging pile includes the charging power of the battery, the power consumption of high-voltage accessories, etc., in the related art, it is necessary to continuously adjust the power of the boost DCDC converter so that while the boost DCDC converter outputs a constant current request value, it is also necessary to ensure the stability of the voltage at the charging port, resulting in a relatively complex control logic for the boost DCDC converter.

[0056] Moreover, the maximum current, maximum voltage, and nameplate information of most current charging piles are recorded inconsistently, and in the related art, it is also impossible to directly obtain or calculate the maximum output power of the charging pile from the messages exchanged between the charging pile and the vehicle. Therefore, using the above related technology, it is impossible to ensure that the charging pile outputs the maximum output power to charge the vehicle, affecting the charging efficiency of the vehicle.

[0057] In view of this, the present disclosure provides a charging method, device, storage medium and vehicle to determine the maximum output power of a charging pile during the vehicle charging process, so that the maximum output power of the charging pile can be utilized to operate stably during boost charging.

[0058] First, it should be understood that the charging method proposed in the present disclosure can be applied to the scenario where a 500V / 750V charging pile charges an 800V platform electric vehicle, or can also be applied to other boost charging scenarios. The embodiments of the present disclosure do not limit this. Taking an 800V platform electric vehicle as an example, as Figure 1 shown, the architecture of an 800V platform electric vehicle includes an 800V power battery (800V Battery), a 400V / 800V boost DCDC converter (400V / 800V DCDC), a power distribution unit (PDU), a DC charging port (DC Port), and other high-voltage accessories (800V HV Accessories) included in the electric vehicle. Among them, other high-voltage accessories may include an air-conditioning system, an electric drive system, an on-board charger OBC, and a boost DCDC converter, etc.

[0059] Exemplarily, as Figure 2 shown, the dashed arrows represent the 500V / 750V energy flow, and the solid arrows represent the 800V energy flow. The energy flow direction of boost charging is as follows: The 500V / 750V charging pile is connected to the DC charging port of the 800V electric vehicle. The switches K5 and K6 of the vehicle are disconnected, and the switches K1 and K2 of the charging pile are closed. The charging pile outputs a 500V / 750V voltage, which is boosted to the specified battery voltage by the 400V / 800V boost DCDC converter to charge and / or supply power to the 800V high-voltage battery and high-voltage accessories. In this case, as Figure 3 shown, the charging pile is equivalent to a voltage source. As long as the power of the connected load does not exceed the maximum output power of the charging pile, the charging pile can stably output according to the voltage requested by the vehicle, and the current is the ratio of the power of the load to the voltage of the charging pile. Therefore, when requesting the charging pile to charge the vehicle in a constant voltage mode, the requested current is the maximum charging current of the charging pile in the interaction message, and the requested voltage is limited by the maximum output voltage of the charging pile and the boost efficiency of the boost DCDC converter. The boost efficiency is different when the voltage difference between the input / output sides of the boost DCDC converter is different. On this basis, the requested voltage can be selected according to the voltage difference corresponding to the optimal boost efficiency and the battery voltage.

[0060] Figure 4 is a flowchart of a charging method shown according to an exemplary embodiment. As Figure 4 shown, the charging method includes the following steps:

[0061] In step S101, an initial required power is determined, where the initial required power is less than the required power at the vehicle battery terminal and less than the maximum boost power of the boost DCDC converter of the vehicle.

[0062] In step S102, based on the initial required power, a request is made to increase the charging output power of an external charging device connected to the vehicle through a preset boosting method, and the maximum output power of the external charging device is determined by the voltage change of the vehicle's charging port after each increase in the charging output power of the external charging device.

[0063] In step S103, a request is made to the external charging device to charge the vehicle in a constant voltage mode according to the maximum output power.

[0064] It should be understood that if the boost power of the boost DCDC converter exceeds the maximum output power of the external charging device, the external charging device in the constant voltage mode will cause the voltage to drop due to output overload. The greater the power exceeded by the boost power of the boost DCDC converter, the greater the voltage drop of the external charging device. If the voltage is too low, it may cause the charging to fail. Therefore, the boost power of the boost DCDC converter during vehicle charging can be controlled to a small value at the beginning to avoid exceeding the power of the external charging device.

[0065] The boost power of the boost DCDC converter is mainly limited by three power values: (1) the required power during vehicle charging; (2) the maximum boost power of the boost DCDC converter; (3) the maximum output power of the external charging device. Also, since the external charging device is equivalent to a voltage source and the vehicle is equivalent to the load of the external charging device when the external charging device charges the vehicle in a constant voltage mode, and the current is the ratio of the power of the load to the voltage of the external charging device, as long as the power of the connected load does not exceed the maximum output power of the external charging device, the external charging device can stably output according to the voltage requested by the vehicle. Therefore, when the required power during vehicle charging and the maximum boost power of the boost DCDC converter are known, an approximate value of the true maximum output power of the external charging device can be determined by defining a smaller output power of the external charging device and boosting the power based on this smaller output power, and a request is made to the external charging device to charge the vehicle in a constant voltage mode according to this approximate value.

[0066] Specifically, when the output power of the smaller external charging device is greater than the boost power of the boost DCDC converter and the battery terminal demand power during vehicle charging, the charging power of the boost DCDC converter will not be limited by the output power of the smaller external charging device, and normal charging can be carried out. When both the boost power of the boost DCDC converter and the battery terminal demand power during vehicle charging are greater than the output power of the smaller external charging device, the charging power of the boost DCDC converter is limited by the output power of the smaller external charging device. In this case, although it will not cause the voltage of the external charging device to drop and the charging to fail, the maximum charging capacity of the external charging device cannot be exerted. At this time, the output power of the smaller external charging device can be increased to exert the true output power of the external charging device.

[0067] Therefore, according to the preset power increase method, the output power of the external charging device can be gradually increased, and during this process, the maximum output power of the external charging device can be determined and the maximum output power value can be locked, and the external charging device is requested to charge the vehicle's battery pack according to the maximum output power. Among them, the external charging device can be a charging pile or other power supply devices that can supply power to the vehicle provided in the present disclosure. The embodiments of the present disclosure do not limit this.

[0068] The preset power increase method can be determined according to parameters such as the charging performance of the external charging device, the minimum controllable boost power of the boost DCDC converter, and the battery terminal demand power during vehicle charging. For example, a constant value can be determined so that the output power of the charging pile can be increased multiple times. It is worth noting that in order to make the finally determined maximum output power of the external charging device closer to the true maximum output power of the external charging device, the constant value can be set to a smaller value such as 2KW or 3KW, so that the charging port voltage will not drop too much after each power increase. Of course, the constant value can also be reduced when the charging port voltage drops too much (for example, the dropped voltage value is greater than the drop threshold) after the power increase. The constant value can be increased when the charging port voltage still does not drop after a preset number of power increases according to the constant value. The embodiments of the present disclosure do not specifically limit the power increase method.

[0069] In addition, the vehicle battery terminal demand power can be the sum of the charging power of the vehicle battery and the power corresponding to other high-voltage accessories included in the vehicle that require electricity. Among them, the high-voltage accessories can include an air-conditioning system, an electric drive system, an on-board charger OBC, a boost DCDC converter, etc. The embodiments of the present disclosure do not limit this.

[0070] Through the above technical solution, based on an initial demand power that is less than the demand power at the vehicle battery end and less than the maximum boost power of the vehicle's boost DCDC converter, the charging output power of the external charging device connected to the vehicle is requested to be increased through a preset boosting method, and after each increase in the charging output power of the external charging device, the voltage change situation at the vehicle's charging port is used to determine the maximum output power of the external charging device, and the external charging device is requested to charge the vehicle in a constant voltage mode according to the maximum output power. In this way, the maximum output power of the external charging device can be determined during the vehicle charging process, enabling the external charging device to operate stably at its maximum output power during boost charging. Moreover, since the external charging device operates in a constant voltage mode, the stability of the voltage at the charging port is ensured. In this way, for the boost DCDC converter, it only needs to output the charging current according to the requested value at the vehicle battery end, and there is no need to adjust the power to keep the voltage at the charging port stable, simplifying the control logic of the boost DCDC converter.

[0071] Exemplarily, before determining the initial demand power, it further includes:

[0072] Request the external charging device to charge the vehicle in a constant voltage mode, and then request the boost DCDC converter to boost the voltage output by the external charging device in a constant current mode. Among them, when the external charging device charges the vehicle in a constant voltage mode, the voltage is the specified voltage, and the current is the maximum current of the external charging device. When requesting the boost DCDC converter to boost the voltage output by the external charging device in a constant current mode, the voltage is the maximum voltage at the vehicle battery end, and the current is the ratio of the minimum value among the demand power for vehicle charging, the maximum boost power of the boost DCDC converter, and the maximum output power of the external charging device to the current voltage at the vehicle battery end.

[0073] In a possible manner, based on the initial demand power, the charging output power of the external charging device connected to the vehicle is requested to be increased through a preset boosting method, and after each increase in the charging output power of the external charging device, the voltage change situation at the vehicle's charging port is used to determine the maximum output power of the external charging device, including:

[0074] Request to increase the initial demand power according to the boosting method to obtain the first output power;

[0075] Request the external charging device to charge the vehicle in a constant voltage mode according to the first output power, and determine the first voltage at the charging port;

[0076] Determine whether the first voltage is less than a preset voltage threshold;

[0077] In the case where it is determined that the first voltage is less than the voltage threshold, the initial demand power is determined as the maximum output power.

[0078] It should be understood that since the external charging device operates in a constant voltage mode, when the power of the boost DCDC converter connected to the external charging device is greater than the maximum power of the external charging device, it will cause the output voltage of the external charging device to drop. Therefore, it is possible to determine whether the charging power of the boost DCDC converter is greater than the maximum output power of the external charging device by judging whether the charging voltage at the charging port drops. That is to say, after each increase in the charging power of the external charging device, the external charging device can be controlled to charge the power battery of the vehicle according to the increased charging power, and it is determined whether the charging voltage at the charging port drops. If the charging voltage at the charging port drops, it means that the charging power of the boost DCDC converter is greater than the maximum output power of the external charging device.

[0079] Exemplarily, the voltage threshold can be determined according to the boost ratio of the boost DCDC and the charging demand voltage at the vehicle battery terminal. In the case where the first voltage is less than the voltage threshold, the initial demand power can be determined as the maximum output power.

[0080] It should also be understood that the external charging device can be connected to multiple electrical devices at the same time, that is, the external charging device can charge the power batteries of multiple vehicles at the same time. Therefore, during the process of charging the vehicle by the external charging device in a constant voltage mode according to the maximum output power, it is possible that the external charging device is disconnected from other vehicles and stops charging the power batteries of other vehicles, resulting in an increase in the maximum output power of the external charging device. At this time, the maximum output power for charging the vehicle by the external charging device is less than the actual maximum output power of the external charging device.

[0081] Therefore, in order to improve the charging efficiency of the vehicle, during the process of determining the initial demand power as the maximum output power and charging the vehicle in a constant voltage mode according to the maximum output power, the charging output power of the external charging device can be increased multiple times, and after each increase, based on the increased output power, the voltage change of the charging port of the vehicle is verified until the charging voltage at the charging port is less than the voltage threshold, indicating that the maximum output power of the external charging device has increased. At this time, the maximum output power of the external charging device can be updated based on the increased output power.

[0082] Exemplarily, during the process of charging the vehicle in a constant voltage mode according to the initial demand power, the first output power can be requested to be increased according to the increase method to obtain the fourth output power, and the external charging device can be requested to charge the vehicle in a constant voltage mode according to the fourth output power, and the fifth voltage of the charging port is determined, and then it is determined whether the fifth voltage is less than the preset voltage threshold.

[0083] If the fifth voltage is less than the voltage threshold, it indicates that the maximum output power of the external charging device has increased. At this time, the fourth output power can be determined as the maximum output power. If the fifth voltage is greater than or equal to the voltage threshold, it indicates that the maximum output power of the external charging device has not increased. Then, continue to request to increase the fourth output power according to the boosting method until the voltage of the charging port corresponding to the increased output power is less than the voltage threshold, which indicates that the maximum output power of the external charging device has increased. At this time, the output power after the previous boost of this boost can be determined as the maximum output power.

[0084] In a possible manner, the charging method further includes:

[0085] When it is determined that the first voltage is greater than or equal to the voltage threshold, request to increase the first output power according to the boosting method to obtain the second output power;

[0086] Request the external charging device to charge the vehicle in a constant voltage mode according to the second output power, and determine the second voltage of the charging port;

[0087] Determine whether the second voltage is less than the voltage threshold;

[0088] When it is determined that the second voltage is less than the voltage threshold, determine the second output power as the maximum output power.

[0089] It should be understood that during the process of increasing the output power of the external charging device according to the boosting method, since it is not certain how many times of power increase are required to make the charging power of the boost DCDC converter greater than the maximum output power of the external charging device, it is possible to judge whether the charging voltage of the charging port drops after each power increase, and when the charging voltage does not drop, perform another power increase and continue to judge whether the charging voltage of the charging port drops until the charging voltage of the charging port drops, then stop performing power increase.

[0090] Therefore, when it is judged that the charging voltage of the charging port does not drop, that is, when the first voltage is greater than or equal to the voltage threshold, the second output power can be increased according to the boosting method to obtain the second output power, then request the external charging device to charge the vehicle in a constant voltage mode, and determine the second voltage of the charging port, judge whether the second voltage drops, that is, determine whether the second voltage is less than the voltage threshold. When it is determined that the second voltage is less than the voltage threshold, determine the second output power as the maximum output power.

[0091] In a possible manner, when it is determined that the first voltage is less than the voltage threshold, determining the initial required power as the maximum output power includes:

[0092] Request the external charging device to charge the vehicle in a constant voltage mode according to the initial required power, and determine the third voltage of the charging port;

[0093] Determine whether the third voltage is less than the voltage threshold;

[0094] When it is determined that the third voltage is greater than or equal to the voltage threshold, determine the initial required power as the maximum output power of the external charging device.

[0095] Exemplarily, in order to ensure the accuracy of the maximum output power and thus ensure that the external charging device exerts its maximum charging capacity, the determined maximum output power can be verified twice. Therefore, the charging output power of the external charging device can be lowered, and verification can be performed based on the voltage change of the vehicle's charging port after the output power is lowered.

[0096] Specifically, the charging output power of the external charging device can be lowered to the initial required power, request the external charging device to charge the vehicle in a constant voltage mode according to the initial required power, determine the third voltage of the charging port, and then determine whether the third voltage is less than the voltage threshold. If the third voltage is greater than or equal to the voltage threshold, it means that based on the lowering of the charging output power of the external charging device, the charging voltage of the charging port rises, which further indicates that the initially determined required power is close to the true maximum output power of the external charging device, and neither the external charging device nor the boost DCDC converter has a fault. In this case, the initial required power can be determined as the maximum output power of the external charging device.

[0097] In a possible manner, the charging method further includes:

[0098] When it is determined that the third voltage is less than the voltage threshold, request to lower the initial required power through a preset lowering method to obtain the third output power;

[0099] Request the external charging device to charge the vehicle in a constant voltage mode according to the third output power and determine the fourth voltage of the charging port;

[0100] Determine whether the fourth voltage is less than the voltage threshold;

[0101] When it is determined that the fourth voltage is greater than or equal to the voltage threshold, determine the initial required power as the maximum output power.

[0102] Exemplarily, due to the different charging performances and / or charging scenarios of the external charging device, during the above-mentioned process of verifying the determined maximum output power twice, there may be a delay in the time when the charging voltage of the charging port rises. In order to ensure the charging efficiency of the vehicle, the charging output power of the external charging device can be lowered multiple times, and after each lowering, the voltage change of the vehicle's charging port can be verified based on the lowered output power until the charging voltage of the charging port rises, and then the power lowering will no longer be performed.

[0103] Therefore, when the third voltage is less than the voltage threshold, the initial required power can be requested to be reduced through a preset reduction method to obtain the third output power. Then, it is requested that the external charging device charge the vehicle in a constant voltage mode according to the third output power, and the fourth voltage of the charging port is determined. Then, it is determined whether the fourth voltage is less than the voltage threshold. If the fourth voltage is greater than or equal to the voltage threshold, it indicates that the charging voltage of the charging port has recovered, which further indicates that the initially determined required power is close to the true maximum output power of the external charging device, and neither the external charging device nor the boost DCDC converter has failed. In this case, the initial required power can be determined as the maximum output power. Among them, the preset reduction method can be the same as the preset increase method. For example, if the increase method is to set a constant value of 2KW, the reduction method can set a constant value of -2KW.

[0104] It should be noted that the failure of the charging voltage of the charging port to recover (i.e., the third voltage is less than the voltage threshold) does not mean that the initial required power cannot be determined as the maximum output power, but only indicates a delay in the recovery of the charging voltage of the charging port. Therefore, after the charging output power of the external charging device is reduced multiple times, when the charging voltage of the charging port recovers, the initial required power is still determined as the maximum output power. Of course, in order to avoid wasting unnecessary waiting time, a preset reduction number can also be set. After the charging output power of the external charging device is reduced by the preset reduction number and the charging voltage of the charging port still does not recover, an abnormal prompt message can be sent so that the driver can replace the external charging device for charging. The embodiments of the present disclosure do not limit this.

[0105] For example, the initial required power is 100KW, the first output power is 102KW, and the constant value of the reduction method is -2KW. When the charging output power of the external charging device is reduced from 102KW to 100KW, the charging voltage of the charging port does not recover, so the charging output power of the external charging device is continuously reduced according to the constant value of -2KW of the reduction method. Assuming that the charging voltage of the charging port recovers when the charging output power of the external charging device is reduced to 80KW, it still indicates that 100KW is close to the true maximum output power of the external charging device, and neither the external charging device nor the boost DCDC converter has failed, so 100KW is still determined as the maximum output power of the external charging device.

[0106] In a possible way, the charging method further includes:

[0107] Determine whether the voltage of the charging port is derated;

[0108] In the case where the voltage of the charging port is derated, adjust the maximum output power to obtain the adjusted maximum output power;

[0109] Request the external charging device to charge the vehicle in constant voltage mode according to the adjusted maximum output power.

[0110] For example, during the process of the external charging device charging the vehicle in constant voltage mode according to the maximum output power, due to some uncertain factors (such as the external charging device overheating, or the external charging device splitting the gun to charge another vehicle, charging multiple vehicles simultaneously), the maximum output power of the external charging device may decrease, causing the voltage at the charging port to drop, which may further lead to charging failure.

[0111] Therefore, during the process of the external charging device charging the vehicle in constant voltage mode according to the maximum output power, it is possible to monitor in real time whether the voltage at the charging port is derated. If it is monitored that the voltage at the charging port is derated, it means that the maximum output power of the external charging device has decreased. At this time, the charging output power of the external charging device can be adjusted, and the external charging device can be requested to charge the vehicle in constant voltage mode according to the adjusted charging output power. The present disclosure embodiment does not specifically limit the monitoring method of the voltage at the charging port.

[0112] In a possible way, when the voltage at the charging port is derated, adjusting the maximum output power to obtain the adjusted maximum output power includes:

[0113] Determine the voltage difference when the voltage is derated;

[0114] Calculate the derating coefficient according to the voltage difference and a preset voltage threshold;

[0115] Determine the derated maximum output power as the product of the maximum output power and the derating coefficient.

[0116] For example, when the voltage at the charging port is derated, the voltage difference when the voltage is derated can be determined, and then the derating coefficient can be calculated according to the voltage difference and the preset voltage threshold. The voltage difference when the voltage is derated = the actual voltage at the charging port / the voltage threshold, and the derating coefficient = N * (1 - the voltage difference). Where N is a preset coefficient, which can be determined according to the charging performance of the external charging device, the required power at the vehicle charging port end, and the boosting performance of the boost DCDC converter. It can be set as a fixed value before charging, or can be adaptively adjusted during charging according to the voltage difference when the voltage is derated and the preset voltage threshold. The present disclosure embodiment does not limit this.

[0117] Figure 5 It is a flowchart of a charging method shown according to another exemplary embodiment. As Figure 5 shown, the charging method includes the following steps:

[0118] In step S201, the initial required power is determined. The initial required power is less than the required power at the vehicle battery terminal and less than the maximum boost power of the vehicle's boost DCDC converter.

[0119] In step S202, the initial required power is requested to be boosted according to the boosting method to obtain the first output power.

[0120] In step S203, it is requested that the external charging device charge the vehicle in constant voltage mode according to the first output power, and the first voltage of the charging port is determined.

[0121] In step S204, it is determined whether the first voltage is less than a preset voltage threshold. If the first voltage is less than the voltage threshold, step S205 is executed; otherwise, step S202 is returned.

[0122] In step S205, it is requested that the external charging device charge the vehicle in constant voltage mode according to the initial required power, and the second voltage of the charging port is determined.

[0123] In step S206, it is determined whether the second voltage is less than the voltage threshold. If the second voltage is less than the voltage threshold, step S207 is executed; otherwise, step S210 is executed.

[0124] In step S207, the initial required power is requested to be reduced through a preset reduction method to obtain the second output power.

[0125] In step S208, it is requested that the external charging device charge the vehicle in constant voltage mode according to the second output power, and the third voltage of the charging port is determined.

[0126] In step S209, it is determined whether the third voltage is less than the voltage threshold. If the third voltage is less than the voltage threshold, step S207 is returned; otherwise, step S210 is executed.

[0127] In step S210, the initial required power is determined as the maximum output power.

[0128] In step S211, it is requested that the external charging device charge the vehicle in constant voltage mode according to the maximum output power.

[0129] In step S212, it is determined whether the voltage of the charging port is derated. If the voltage of the charging port is derated, step S214 is executed; otherwise, step S212 is returned.

[0130] In step S214, the voltage difference when the voltage is derated is determined.

[0131] In step S215, according to the voltage difference and the preset voltage threshold, the derating coefficient is calculated.

[0132] Step S216, determine the maximum output power after derating by multiplying the maximum output power and the derating factor.

[0133] Step S217, request the external charging device to charge the vehicle in constant voltage mode according to the adjusted maximum output power.

[0134] Through the above technical solution, based on an initial demand power that is less than the demand power at the vehicle battery terminal and less than the maximum boost power of the vehicle's boost DCDC converter, request to increase the charging output power of the external charging device connected to the vehicle through a preset increase method, and determine the maximum output power of the external charging device based on the voltage change of the vehicle's charging port after each increase in the charging output power of the external charging device, and request the external charging device to charge the vehicle in constant voltage mode according to the maximum output power. In this way, the maximum output power of the external charging device can be determined during the vehicle charging process, enabling the external charging device to operate stably at its maximum output power during boost charging. Moreover, since the external charging device operates in constant voltage mode, the stability of the voltage at the charging port is ensured. Thus, for the boost DCDC converter, it only needs to output the charging current according to the requested value at the vehicle battery terminal, without the need to adjust the power to keep the voltage at the charging port stable, simplifying the control logic of the boost DCDC converter. Further, during the process of the external charging device charging the vehicle in constant voltage mode according to the maximum output power, when it is monitored that the voltage at the charging port is derated, the maximum output power can be adjusted according to the voltage difference and a preset voltage threshold, avoiding the charging port voltage being pulled down due to the derating of the power of the external charging device, resulting in charging failure.

[0135] Figure 6 is a block diagram of a charging device shown according to an exemplary embodiment. Refer to Figure 6 As shown in FIG. 3, the charging device 300 includes a first determination module 301, a second determination module 302, and a charging module 303.

[0136] The first determination module 301 is configured to determine an initial demand power, where the initial demand power is less than the demand power at the vehicle battery terminal and less than the maximum boost power of the vehicle's boost DCDC converter;

[0137] The second determination module 302 is configured to, based on the initial demand power, request to increase the charging output power of the external charging device connected to the vehicle through a preset increase method, and determine the maximum output power of the external charging device based on the voltage change of the vehicle's charging port after each increase in the charging output power of the external charging device;

[0138] The charging module 303 is configured to request the external charging device to charge the vehicle in a constant voltage mode according to the maximum output power.

[0139] Optionally, the second determination module 302 is configured to:

[0140] The first boosting module is configured to request to boost the initial required power according to the boosting method to obtain a first output power;

[0141] The third determination module is configured to request the external charging device to charge the vehicle in a constant voltage mode according to the first output power and determine the first voltage of the charging port;

[0142] The fourth determination module is configured to determine whether the first voltage is less than a preset voltage threshold;

[0143] The fifth determination module is configured to, when determining that the first voltage is less than the voltage threshold, determine the initial required power as the maximum output power.

[0144] Optionally, the charging device 300 further includes:

[0145] The second boosting module is configured to, when determining that the first voltage is greater than or equal to the voltage threshold, request to boost the first output power according to the boosting method to obtain a second output power;

[0146] The sixth determination module is configured to request the external charging device to charge the vehicle in a constant voltage mode according to the second output power and determine the second voltage of the charging port;

[0147] The seventh determination module is configured to determine whether the second voltage is less than the voltage threshold;

[0148] The eighth determination module is configured to, when determining that the second voltage is less than the voltage threshold, determine the second output power as the maximum output power.

[0149] Optionally, the fifth determination module is configured to:

[0150] Request the external charging device to charge the vehicle in a constant voltage mode according to the initial required power and determine the third voltage of the charging port;

[0151] Determine whether the third voltage is less than the voltage threshold;

[0152] When determining that the third voltage is greater than or equal to the voltage threshold, determine the initial required power as the maximum output power of the external charging device.

[0153] Optionally, the charging device 300 further includes:

[0154] A lowering module, configured to, when it is determined that the third voltage is less than the voltage threshold, request to lower the initial required power in a preset lowering manner to obtain a third output power;

[0155] A ninth determination module, configured to request the external charging device to charge the vehicle in a constant voltage mode according to the third output power and determine a fourth voltage of the charging port;

[0156] A tenth determination module, configured to determine whether the fourth voltage is less than the voltage threshold;

[0157] An eleventh determination module, configured to, when it is determined that the fourth voltage is greater than or equal to the voltage threshold, determine the initial required power as the maximum available output power.

[0158] Optionally, the charging device 300 further includes:

[0159] A twelfth determination module, configured to determine whether the voltage of the charging port is derated;

[0160] An adjustment module, configured to, when the voltage of the charging port is derated, adjust the maximum available output power to obtain an adjusted maximum available output power;

[0161] A charging sub-module, configured to request the external charging device to charge the vehicle in a constant voltage mode according to the adjusted maximum available output power.

[0162] Optionally, the adjustment module is configured to:

[0163] Determine the voltage difference when the voltage is derated;

[0164] Calculate a derating coefficient according to the voltage difference and a preset voltage threshold;

[0165] Determine the product of the maximum available output power and the derating coefficient as the derated maximum available output power.

[0166] Regarding the device in the above embodiments, the specific manners in which each module performs operations have been described in detail in the embodiments related to the method, and will not be elaborated herein.

[0167] The present disclosure further provides a computer-readable storage medium, on which computer program instructions are stored, and when the program instructions are executed by a processor, the steps of the charging method provided by the present disclosure are implemented.

[0168] The present disclosure further provides a vehicle, including:

[0169] A memory storing a computer program thereon;

[0170] A processor configured to execute the computer program in the memory to implement the steps of the charging method provided by the present disclosure.

[0171] Figure 7 is a block diagram of an electronic device shown according to an exemplary embodiment. For example, the electronic device 800 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0172] Referring to Figure 7 , the electronic device 800 may include one or more of the following components: a processing component 802, a memory 804, a power supply component 806, a multimedia component 808, an audio component 810, an input / output interface 812, a sensor component 814, and a communication component 816.

[0173] The processing component 802 generally controls the overall operation of the electronic device 800, such as operations associated with display, telephone calls, data communication, camera operations, and recording operations. The processing component 802 may include one or more processors 820 to execute instructions to complete all or part of the steps of the above-mentioned charging method. In addition, the processing component 802 may include one or more modules to facilitate the interaction between the processing component 802 and other components. For example, the processing component 802 may include a multimedia module to facilitate the interaction between the multimedia component 808 and the processing component 802.

[0174] The memory 804 is configured to store various types of data to support the operation of the electronic device 800. Examples of such data include instructions for any application or method operating on the electronic device 800, contact data, phone book data, messages, pictures, videos, etc. The memory 804 may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, a magnetic disk, or an optical disk.

[0175] The power supply component 806 provides power to various components of the electronic device 800. The power supply component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the electronic device 800.

[0176] The multimedia component 808 includes a screen that provides an output interface between the electronic device 800 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors can sense not only the boundaries of touch or swipe actions but also detect the duration and pressure associated with the touch or swipe operation. In some embodiments, the multimedia component 808 includes a front camera and / or a rear camera. When the electronic device 800 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each of the front camera and the rear camera can be a fixed optical lens system or have a focal length and optical zoom capabilities.

[0177] The audio component 810 is configured to output and / or input audio signals. For example, the audio component 810 includes a microphone (MIC) that is configured to receive external audio signals when the electronic device 800 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the memory 804 or transmitted via the communication component 816. In some embodiments, the audio component 810 further includes a speaker for outputting audio signals.

[0178] The input / output interface 812 provides an interface between the processing component 802 and a peripheral interface module, and the peripheral interface module can be a keyboard, a click wheel, buttons, etc. These buttons can include but are not limited to: a home button, a volume button, a power button, and a lock button.

[0179] The sensor component 814 includes one or more sensors for providing a status assessment of various aspects of the electronic device 800. For example, the sensor component 814 can detect the on / off state of the electronic device 800, the relative positioning of components, such as the display and the keypad of the electronic device 800. The sensor component 814 can also detect a change in the position of the electronic device 800 or a component of the electronic device 800, the presence or absence of user contact with the electronic device 800, the orientation or acceleration / deceleration of the electronic device 800, and the temperature change of the electronic device 800. The sensor component 814 can include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor component 814 can also include a light sensor, such as a CMOS or a CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 814 can further include an acceleration sensor, a gyro sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0180] The communication component 816 is configured to facilitate communication between the electronic device 800 and other devices in a wired or wireless manner. The electronic device 800 can access a communication standard-based wireless network, such as WiFi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0181] In an exemplary embodiment, the electronic device 800 can be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above charging method.

[0182] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 804 including instructions, and the above instructions can be executed by a processor 820 of the electronic device 800 to complete the above charging method. For example, the non-transitory computer-readable storage medium can be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0183] In addition to being an independent electronic device, the above-mentioned device can also be a part of an independent electronic device. For example, in one embodiment, the device can be an integrated circuit (IC) or a chip. The integrated circuit can be a single IC or a collection of multiple ICs. The chip can include, but is not limited to, the following types: GPU (Graphics Processing Unit), CPU (Central Processing Unit), FPGA (Field Programmable Gate Array), DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), SOC (System on Chip), etc. The above-mentioned integrated circuit or chip can be used to execute executable instructions (or code) to implement the above-mentioned charging method. The executable instructions can be stored in the integrated circuit or chip, or obtained from other devices or equipment. For example, the integrated circuit or chip includes a processor, a memory, and an interface for communicating with other devices. The executable instructions can be stored in the memory and, when executed by the processor, implement the above-mentioned charging method. Alternatively, the integrated circuit or chip can receive the executable instructions through the interface and transmit them to the processor for execution to implement the above-mentioned charging method.

[0184] In another exemplary embodiment, a computer program product is also provided. The computer program product includes a computer program that can be executed by a programmable device. The computer program has a code portion for executing the above-mentioned charging method when executed by the programmable device.

[0185] After considering the specification and practicing the present disclosure, those skilled in the art will readily think of other embodiments of the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0186] It should be understood that the present disclosure is not limited to the exact structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A charging method, characterized in that, Including: Determine the initial required power, where the initial required power is less than the required power at the vehicle battery terminal and less than the maximum boost power of the boost DCDC converter of the vehicle; Based on the initial required power, request to increase the charging output power of an external charging device connected to the vehicle through a preset boosting method, and determine the maximum output power of the external charging device based on the voltage change of the vehicle's charging port after each increase in the charging output power of the external charging device; Request the external charging device to charge the vehicle in a constant voltage mode according to the maximum output power; Wherein, based on the initial required power, requesting to increase the charging output power of an external charging device connected to the vehicle through a preset boosting method, and determining the maximum output power of the external charging device based on the voltage change of the vehicle's charging port after each increase in the charging output power of the external charging device includes: Request to increase the initial required power according to the boosting method to obtain a first output power; Request the external charging device to charge the vehicle in a constant voltage mode according to the first output power and determine the first voltage of the charging port; Determine whether the first voltage is less than a preset voltage threshold; In the case where it is determined that the first voltage is less than the voltage threshold, determine the initial required power as the maximum output power.

2. The charging method according to claim 1, wherein It further includes: In the case where it is determined that the first voltage is greater than or equal to the voltage threshold, request to increase the first output power according to the boosting method to obtain a second output power; Request the external charging device to charge the vehicle in a constant voltage mode according to the second output power and determine the second voltage of the charging port; Determine whether the second voltage is less than the voltage threshold; In the case where it is determined that the second voltage is less than the voltage threshold, determine the second output power as the maximum output power.

3. The charging method according to claim 1, wherein The case where, in the case where it is determined that the first voltage is less than the voltage threshold, determining the initial required power as the maximum output power includes: Request the external charging device to charge the vehicle in a constant voltage mode according to the initial required power and determine the third voltage of the charging port; Determine whether the third voltage is less than the voltage threshold; In the case where it is determined that the third voltage is greater than or equal to the voltage threshold, determine the initial required power as the maximum output power of the external charging device.

4. The charging method according to claim 3, wherein It further includes: In the case where it is determined that the third voltage is less than the voltage threshold, request to decrease the initial required power through a preset decreasing method to obtain a third output power; Request the external charging device to charge the vehicle in a constant voltage mode according to the third output power and determine the fourth voltage of the charging port; Determine whether the fourth voltage is less than the voltage threshold; In the case where it is determined that the fourth voltage is greater than or equal to the voltage threshold, determine the initial required power as the maximum output power.

5. The charging method according to claim 1, wherein It further includes: Determine whether the voltage of the charging port is derated; When the voltage at the charging port is derated, adjust the maximum available output power to obtain the adjusted maximum available output power; Request the external charging device to charge the vehicle in constant voltage mode according to the adjusted maximum available output power.

6. The charging method according to claim 5, wherein When the voltage at the charging port is derated, adjust the maximum available output power to obtain the adjusted maximum available output power, including: Determine the voltage difference when the voltage is derated; Calculate a derating coefficient based on the voltage difference and a preset voltage threshold; Determine the derated maximum available output power as the product of the maximum available output power and the derating coefficient.

7. A charging device, characterized in that, including: A first determination module configured to determine an initial required power, where the initial required power is less than the required power at the vehicle battery terminal and less than the maximum boost power of the vehicle's boost DCDC converter; A second determination module configured to, based on the initial required power, request to increase the charging output power of an external charging device connected to the vehicle through a preset increase method, and determine the maximum available output power of the external charging device based on the voltage change at the vehicle's charging port after each increase in the charging output power of the external charging device; A charging module configured to request the external charging device to charge the vehicle in constant voltage mode according to the maximum available output power; wherein, the second determination module is configured to: A first increase module configured to request an increase in the initial required power according to the increase method to obtain a first output power; A third determination module configured to request the external charging device to charge the vehicle in constant voltage mode according to the first output power and determine the first voltage at the charging port; A fourth determination module configured to determine whether the first voltage is less than a preset voltage threshold; A fifth determination module configured to, when it is determined that the first voltage is less than the voltage threshold, determine the initial required power as the maximum available output power.

8. A computer-readable storage medium having computer program instructions stored thereon, characterized in that, When the program instruction is executed by a processor, it implements the steps of the method according to any one of claims 1-6.

9. A vehicle, characterized in that, including: A memory having a computer program stored thereon; A processor for executing the computer program in the memory to implement the steps of the method according to any one of claims 1-6.

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