Voltage conversion system control method and device, controller and vehicle

Abstract

The invention relates to the technical field of power supply control, and discloses a voltage conversion system control method and device, a controller and a vehicle, a voltage conversion system is connected between a power battery and a charging pile, and the charging pile charges the power battery through the voltage conversion system; the method comprises the steps that a power battery and a voltage conversion system are connected based on a power-on instruction; performing voltage platform matching detection on the power battery and the charging pile to obtain a first matching result; if the first matching result shows that the voltage platforms of the power battery and the charging pile are not matched, obtaining a first conversion proportion according to respective maximum voltages, and controlling a voltage conversion system to perform voltage conversion according to the first conversion proportion, so that the charging pile charges the power battery; and based on the power-off instruction, controlling the voltage conversion system to stop working, and disconnecting. The beneficial effects of the invention are that the method achieves the technical effects of enabling devices configured with different voltage platforms to be compatible with each other through voltage conversion, and optimizing the charging efficiency.

Description

Technical Field

[0001] The present application relates to the field of power supply control technology, and in particular to a voltage conversion system control method, device, controller and vehicle. Background Art

[0002] With the development of new energy vehicles, the number of new energy vehicles is growing rapidly, and the equipment supporting new energy vehicles, such as charging piles, is also being gradually promoted. New energy vehicles are equipped with power batteries, which can be charged through charging piles, and can be used to charge the storage battery in new energy vehicles or power the all-in-one electronic control system in new energy vehicles. If the above equipment is configured under different voltage platforms, it will lead to incompatibility between different devices, resulting in the inability to perform charging and power supply operations, affecting the use of new energy vehicles. Summary of the invention

[0003] The present application provides a voltage conversion system control method, device, controller and vehicle, which achieve the technical effect of making devices configured with different voltage platforms compatible with each other through voltage conversion and optimizing charging efficiency.

[0004] In order to achieve the above objectives, the main technical solutions adopted in this application include:

[0005] In a first aspect, an embodiment of the present application provides a voltage conversion system control method, wherein the voltage conversion system is connected between a power battery and a charging pile, and the charging pile charges the power battery through the voltage conversion system; the method comprises:

[0006] connecting the power battery and the voltage conversion system based on a power-on instruction;

[0007] Performing a voltage platform matching test on the power battery and the charging pile to obtain a first matching result;

[0008] If the first matching result indicates that the voltage platforms of the power battery and the charging pile do not match, a first conversion ratio is obtained by performing a proportional conversion according to the respective maximum voltages of the power battery and the charging pile, and the voltage conversion system is controlled to perform voltage conversion according to the first conversion ratio, so that the charging pile charges the power battery;

[0009] Based on the power-off instruction, the voltage conversion system is controlled to stop working, and the connection between the charging pile and the power battery is disconnected.

[0010] The voltage conversion system control method proposed in the embodiment of the present application, when the voltage platforms of the power battery and the charging pile do not match, obtains a first conversion ratio according to the respective maximum voltages of the power battery and the charging pile, and controls the voltage conversion system to perform voltage conversion according to the first conversion ratio, so that the charging pile charges the power battery, and achieves the technical effect that devices of different voltage platforms can be compatible with each other, thereby being able to utilize resources of multiple voltage platforms. In addition, in this method, the first conversion ratio is obtained according to the respective maximum voltages of the power battery and the charging pile, which improves the accuracy of voltage conversion during charging, thereby being able to fully utilize the voltage capabilities of the charging pile and the power battery, and can optimize the charging efficiency and speed up the charging speed compared with related technologies.

[0011] Optionally, the first conversion ratio is obtained according to the following method:

[0012] Performing voltage calculation according to the current current and the current voltage of the power battery to obtain the output voltage of the voltage conversion system;

[0013] According to the respective maximum voltages of the power battery and the charging pile, the current voltage of the power battery is proportionally converted to obtain the input voltage of the voltage conversion system;

[0014] The first conversion ratio is obtained by performing a ratio calculation based on the output voltage and the input voltage.

[0015] Optionally, the voltage conversion system is connected to one end of a main negative relay, one end of a charging relay and a parallel relay, the other end of the main negative relay is connected to the power battery, the other end of the charging relay is connected to the charging pile, and the parallel relay is connected in parallel with the voltage conversion system; the method further includes:

[0016] Based on the power-on instruction, closing the main negative relay to connect the power battery and the voltage conversion system;

[0017] Closing the charging relay to connect the charging pile and the voltage conversion system;

[0018] If the first matching result indicates that the voltage platforms of the power battery and the charging pile match, a parallel relay connected in parallel with the voltage conversion system is closed to connect the power battery and the charging pile.

[0019] Optionally, before controlling the voltage conversion system to perform voltage conversion according to the first conversion ratio so that the charging pile charges the power battery, the method further includes:

[0020] The voltage range of the power battery is fitted according to the first conversion ratio to obtain a fitted voltage range of the power battery, and the fitted voltage range is sent to the charging pile to complete the handshake configuration verification between the power battery and the charging pile.

[0021] Optionally, the voltage conversion system is further connected between the power battery and the storage battery system, and the power battery charges the storage battery system through the voltage conversion system; the method further includes:

[0022] Performing a voltage platform matching test on the power battery and the storage battery system to obtain a second matching result;

[0023] If the second matching result indicates that the voltage platforms of the power battery and the battery system do not match, a second conversion ratio is obtained by performing a proportional conversion based on the respective maximum voltages of the power battery and the battery system, and the voltage conversion system is controlled to perform voltage conversion based on the second conversion ratio, so that the power battery charges the battery system.

[0024] Optionally, the voltage conversion system is further connected between the power battery and the all-in-one electric control system, and the power battery supplies power to the all-in-one electric control system through the voltage conversion system; the method further includes:

[0025] Performing a voltage platform matching test on the power battery and the all-in-one electronic control system to obtain a third matching result;

[0026] If the third matching result indicates that the voltage platforms of the power battery and the all-in-one electronic control system do not match, the voltage conversion system is controlled to perform voltage conversion according to a third conversion ratio so that the power battery supplies power to the all-in-one electronic control system.

[0027] Optionally, the third conversion ratio is obtained according to the following method:

[0028] If the current voltage of the power battery exceeds the rated voltage of the power battery, the third conversion ratio is obtained according to the ratio of the maximum voltage of the power battery to the maximum voltage of the all-in-one electronic control system;

[0029] If the current voltage of the power battery does not exceed the rated voltage of the power battery, the third conversion ratio is obtained according to the ratio of the current voltage of the power battery to the rated voltage of the all-in-one electronic control system.

[0030] In a second aspect, an embodiment of the present application provides a voltage conversion system control device, wherein the voltage conversion system is connected between a power battery and a charging pile, and the charging pile charges the power battery through the voltage conversion system; the device comprises:

[0031] A power-on module, used to connect the power battery and the voltage conversion system based on a power-on instruction;

[0032] A matching module, used for performing voltage platform matching detection on the power battery and the charging pile to obtain a first matching result;

[0033] a conversion module, configured to control the voltage conversion system to perform voltage conversion, and if the first matching result indicates that the voltage platforms of the power battery and the charging pile do not match, perform a ratio conversion according to the respective maximum voltages of the power battery and the charging pile to obtain a first conversion ratio, and control the voltage conversion system to perform voltage conversion according to the first conversion ratio, so that the charging pile charges the power battery;

[0034] The power-off module is used to control the voltage conversion system to stop working and disconnect the connection between the charging pile and the power battery based on the power-off instruction.

[0035] In a third aspect, an embodiment of the present application provides a controller, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, computer instructions are stored in the memory, and the processor executes the method described in any one of the above embodiments by executing the computer instructions.

[0036] In a fourth aspect, an embodiment of the present application provides a vehicle, characterized in that it includes a voltage conversion system control device as described in the embodiment of the second aspect or a controller as described in the embodiment of the third aspect.

[0037] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions are used to enable a computer to execute any one of the methods in the above embodiments.

[0038] In a sixth aspect, an embodiment of the present application provides a computer program product, including computer instructions, wherein the computer instructions are used to enable a computer to execute any one of the methods described in the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1A step diagram of a voltage conversion system control method provided in an embodiment of the present application;

[0041] Figure 2 This is a circuit architecture diagram of a voltage conversion system included in an embodiment of the present application;

[0042] Figure 3 A diagram showing the steps of obtaining a first conversion ratio in an embodiment of the present application;

[0043] Figure 4 A diagram showing the steps of charging a battery in an embodiment of the present application;

[0044] Figure 5 A diagram showing the steps of supplying power to the all-in-one electric control system in an embodiment of the present application;

[0045] Figure 6 A diagram showing the steps of obtaining a third conversion ratio in an embodiment of the present application;

[0046] Figure 7 A module diagram of a voltage conversion system control device provided in an embodiment of the present application;

[0047] Figure 8 A schematic diagram of the structure of a controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0049] With the development of new energy vehicles, the number of new energy vehicles is growing rapidly, and equipment supporting new energy vehicles, such as charging piles, is also being gradually promoted. New energy vehicles are equipped with power batteries, which can be charged through charging piles, and can be used to charge the storage battery in new energy vehicles, or to power the all-in-one electronic control system in new energy vehicles. However, since new energy vehicles and supporting equipment are designed and produced by multiple parties, the internal systems of new energy vehicles and between new energy vehicles and supporting equipment are prone to voltage platform mismatch, resulting in incompatibility between the two parties, and thus the inability to perform charging and power supply operations, affecting the use of new energy vehicles.

[0050] Based on the above problems, the present application provides a voltage conversion system control method, device, controller and vehicle, wherein the voltage conversion system is connected between the power battery and the charging pile, and the charging pile charges the power battery through the voltage conversion system. The method includes: connecting the power battery and the voltage conversion system based on the power-on instruction; performing voltage platform matching detection on the power battery and the charging pile to obtain a first matching result; if the first matching result indicates that the voltage platforms of the power battery and the charging pile do not match, performing proportional conversion according to the respective maximum voltages of the power battery and the charging pile to obtain a first conversion ratio, and controlling the voltage conversion system to perform voltage conversion according to the first conversion ratio, so that the charging pile charges the power battery; based on the power-off instruction, controlling the voltage conversion system to stop working and disconnecting the connection between the charging pile and the power battery.

[0051] The voltage conversion system control method proposed in the embodiment of the present application obtains a first conversion ratio according to the respective maximum voltages of the power battery and the charging pile when the voltage platforms of the power battery and the charging pile do not match, and controls the voltage conversion system to perform voltage conversion according to the first conversion ratio, so that the charging pile charges the power battery, thereby achieving the technical effect of mutual compatibility between devices on different voltage platforms, thereby being able to utilize resources on multiple voltage platforms.

[0052] In addition, in this method, the first conversion ratio is obtained according to the maximum voltage of the power battery and the charging pile, thereby improving the accuracy of voltage conversion during the charging process, thereby being able to fully utilize the voltage capacity of the charging pile and the power battery. Compared with related technologies, the charging efficiency can be optimized and the charging speed can be accelerated.

[0053] The voltage conversion system control method provided in this specification can be applied between the charging pile and the power battery of the new energy vehicle to charge the power battery through voltage conversion. In addition, this method can also be used between the power battery and the battery system of the new energy vehicle to charge the battery system through voltage conversion; this method can also be used between the power battery and the all-in-one electronic control system of the new energy vehicle to power the all-in-one electronic control system through voltage conversion. It can be understood that after adaptive modification, this method can also be used between other devices configured with different voltage platforms, so that the devices can be compatible and exchange power.

[0054] According to an embodiment of the present application, an embodiment of a voltage conversion system control method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0055] In this embodiment, a voltage conversion system control method is provided, which can be used between the above-mentioned charging pile and the power battery of the new energy vehicle. The voltage conversion system is connected between the power battery and the charging pile, and the charging pile charges the power battery through the voltage conversion system. Figure 1 As shown, the method includes:

[0056] S100. Connect the power battery and the voltage conversion system based on the power-on instruction.

[0057] S200. Perform voltage platform matching detection on the power battery and the charging pile to obtain a first matching result.

[0058] S300. If the first matching result indicates that the voltage platforms of the power battery and the charging pile do not match, a proportional conversion is performed according to the respective maximum voltages of the power battery and the charging pile to obtain a first conversion ratio, and the voltage conversion system is controlled to perform voltage conversion according to the first conversion ratio so that the charging pile charges the power battery.

[0059] S400. Based on the power-off instruction, the voltage conversion system is controlled to stop working, and the connection between the charging pile and the power battery is disconnected.

[0060] Among them, the voltage conversion system can be a DCDC conversion module, which has a bidirectional voltage conversion capability, can convert the input DC voltage, and output the corresponding output voltage. The voltage conversion system can be connected between different devices. When the voltage platforms of the connected devices do not match, the voltage can be converted by the voltage conversion system so that the connected devices can interact with each other. Exemplarily, when the voltage conversion system is connected between the power battery and the charging pile, the voltage platform of the power battery is 600V, and the voltage platform of the charging pile is 800V. The power battery and the charging pile are incompatible and cannot be charged; at this time, the voltage conversion system can be used to convert the approximately 800V voltage output by the charging pile into a voltage of approximately 600V that matches the power battery, thereby charging the power battery.

[0061] Reference Figure 2 As shown, Figure 2 This is a circuit architecture diagram including a voltage conversion system in an embodiment of the present application. As shown in the figure, the power battery, the voltage conversion system and the charging pile constitute a high-voltage charging circuit, which also includes a main negative relay S1 and a charging relay S7. By closing the main negative relay S1 and the charging relay S7, the power battery and the charging pile are connected through the voltage conversion system.

[0062] Specifically, connecting the power battery and the voltage conversion system based on the power-on instruction includes: detecting whether a plug-in signal and an A+ signal (control guide signal) are received. The plug-in signal can be a signal sent after the charging gun on the charging pile is connected to the charging port of the vehicle, indicating that the charging pile has been connected to the power battery; the A+ signal can be a communication signal between the charging pile and the vehicle to indicate the charging mode of the charging pile, etc. After receiving the plug-in signal and the A+ signal, the vehicle's entire status and fault condition are detected, and after confirming that the vehicle's entire status and fault condition meet the requirements, the power battery and the voltage conversion system are connected, and the voltage conversion system is enabled to be in working condition.

[0063] Furthermore, a voltage platform matching test is performed on the power battery and the charging pile to obtain a first matching result, wherein the first matching result indicates whether the voltage platforms of the power battery and the charging pile match. If the first matching result indicates that the voltage platforms of the power battery and the charging pile match, the charging pile can directly charge the power battery; if the first matching result indicates that the voltage platforms of the power battery and the charging pile do not match, the charging pile cannot directly charge the power battery and needs to be converted through a voltage conversion system.

[0064] Furthermore, when the voltage platforms of the power battery and the charging pile do not match, the voltage conversion system is controlled to convert the voltage output by the charging pile so that the voltage matches the voltage of the power battery, thereby charging the power battery. When the voltage conversion is performed in the voltage conversion system, the ratio between the output voltage and the input voltage of the voltage conversion system, i.e., the first conversion ratio, can be obtained by proportional conversion based on the respective maximum voltages of the power battery and the charging pile, so as to improve the accuracy of the voltage conversion.

[0065] Compared with the related art, this method uses the maximum voltage to calculate the conversion ratio. Since the input voltage of the voltage conversion system is close to the output voltage of the charging pile, and the output voltage of the voltage conversion system is close to the input voltage of the power battery, the voltage can be accurately converted through the first conversion ratio, thereby improving the voltage conversion accuracy, reducing the deviation between the output voltage of the voltage conversion system and the input voltage of the power battery, and reducing the decrease in charging efficiency due to heat loss. In addition, using the maximum voltage to calculate the conversion ratio fully considers the output capacity of the charging pile and the receiving capacity of the power battery, improves the voltage matching between the charging pile and the power battery, and improves the charging efficiency.

[0066] Furthermore, the reason for issuing the power-off command may be that the power battery is fully charged, the charging pile requests to end the power outage, the battery fails, or the vehicle fails. After receiving the power-off command, the voltage conversion system is first controlled to adjust the output current to zero, and the connection between the charging pile and the voltage conversion system is disconnected; secondly, the voltage conversion system is controlled to adjust the input current to zero, the voltage conversion system is controlled to stop working, and the connection between the voltage conversion system and the power battery is disconnected, so that the voltage conversion system enters sleep and the charging process ends.

[0067] The voltage conversion system control method provided in this embodiment obtains a first conversion ratio according to the respective maximum voltages of the power battery and the charging pile when the voltage platforms of the power battery and the charging pile do not match, and controls the voltage conversion system to perform voltage conversion according to the first conversion ratio, so that the charging pile charges the power battery, achieving the technical effect that devices of different voltage platforms can be compatible with each other, thereby being able to utilize resources of multiple voltage platforms. In addition, in this method, the first conversion ratio is obtained according to the respective maximum voltages of the power battery and the charging pile, which improves the accuracy of voltage conversion during charging, thereby being able to fully utilize the voltage capabilities of the charging pile and the power battery, and can optimize the charging efficiency and speed up the charging speed compared with related technologies.

[0068] Reference Figure 3 As shown, as an embodiment of the present application, the first conversion ratio is obtained according to the following method:

[0069] S310. Calculate the voltage according to the current current and the current voltage of the power battery to obtain the output voltage of the voltage conversion system.

[0070] S320. According to the respective maximum voltages of the power battery and the charging pile, the current voltage of the power battery is proportionally converted to obtain the input voltage of the voltage conversion system.

[0071] S330. Perform a ratio calculation based on the output voltage and the input voltage to obtain a first conversion ratio.

[0072] Specifically, the output voltage of the voltage conversion system is expressed according to the following formula:

[0073]

[0074] Among them, V do Represents the output voltage of the voltage conversion system; I b is the current of the power battery; V b is the current voltage of the power battery; R1 is the sum of the internal resistance of the power battery and the line resistance at the output end of the voltage conversion system.

[0075] Furthermore, the input voltage of the voltage conversion system is expressed according to the following formula:

[0076]

[0077] Among them, V di Represents the input voltage of the voltage conversion system; V cmax is the maximum voltage of the charging pile; V bmax is the maximum voltage of the power battery.

[0078] Furthermore, a ratio is calculated based on the output voltage and input voltage of the voltage conversion system to obtain a first conversion ratio. Compared with the related art, the method uses the maximum voltage of the power battery and the charging pile to calculate the conversion ratio. Since the input voltage of the voltage conversion system is close to the output voltage of the charging pile, and the output voltage of the voltage conversion system is close to the input voltage of the power battery, the voltage can be accurately converted through the first conversion ratio, the voltage conversion accuracy is improved, the deviation between the output voltage of the voltage conversion system and the input voltage of the power battery is reduced, and the charging efficiency decrease caused by heat loss is reduced.

[0079] In addition, using the maximum voltage to calculate the conversion ratio fully considers the output capacity of the charging pile and the receiving capacity of the power battery, improves the voltage matching between the charging pile and the power battery, and thus improves the charging efficiency.

[0080] Specifically, the charging process includes a constant current charging stage and a constant voltage charging stage. In the constant current charging stage, the input current of the power battery remains constant. At this time, the output current of the charging pile can be determined according to the input current of the power battery and the output voltage and input voltage of the voltage conversion system. Its form is expressed according to the following formula:

[0081] I c ·V di =I b ·V do

[0082] Among them, I c Indicates the output current of the charging pile,

[0083]

[0084] Among them, V c represents the output voltage of the charging pile; R2 is the line resistance of the charging pile. The charging pile adjusts the output voltage according to the above formula to charge the power battery with constant current.

[0085] Furthermore, in the constant voltage charging stage, the output voltage of the voltage conversion system is expressed according to the following formula:

[0086] V do =V b +R1·I b

[0087] Since the input voltage of the power battery remains constant, the output voltage of the charging pile also remains constant, and the output current of the charging pile is adjusted according to the following formula:

[0088] V c =V di +I c ·R2.

[0089] As an embodiment of the present application, the voltage conversion system is connected to one end of the main negative relay S1, one end of the charging relay S7 and the parallel relay, the other end of the main negative relay S1 is connected to the power battery, the other end of the charging relay S7 is connected to the charging pile, and the parallel relay is connected in parallel with the voltage conversion system; the method also includes:

[0090] S110. Based on the power-on command, close the main negative relay S1 to connect the power battery and the voltage conversion system.

[0091] S120. Close the charging relay S7 to connect the charging pile and the voltage conversion system.

[0092] S130. If the first matching result indicates that the voltage platforms of the power battery and the charging pile match, close the parallel relay connected in parallel with the voltage conversion system to connect the power battery and the charging pile.

[0093] Specifically, refer to Figure 2 As shown, the main negative relay S1 is connected between the power battery and the voltage conversion system, and the charging relay S7 is connected between the voltage conversion system and the charging pile. By closing the main negative relay S1, the power battery can be connected to the voltage conversion system, and by closing the charging relay S7, the voltage conversion system can be connected to the charging pile. The main negative relay S1 and the charging relay S7 jointly control the opening and closing of the high-voltage charging circuit. In the actual charging process, after closing the main negative relay S1 and the charging relay S7, the output voltage of the voltage conversion system is also detected. If the difference between the output voltage and the target voltage required by the power battery is less than 5%, and the above state lasts for more than 200ms, the feedback working state is running, indicating that the power battery is in a normal charging state, otherwise it is determined that a fault has occurred and charging is stopped.

[0094] Further, refer to Figure 2As shown, the parallel relay includes a voltage conversion positive relay S2 and a voltage conversion negative relay S3, and the voltage conversion positive relay S2 and the voltage conversion negative relay S3 are respectively connected in parallel with the voltage conversion system. By closing the parallel relay, the voltage output by the charging pile is not output to the power battery through the parallel relay, but no longer passes through the voltage conversion system, thereby reducing voltage loss and improving charging efficiency. In the actual charging process, after closing the parallel relay, the output voltage of the voltage conversion system is also detected. If the difference between the output voltage and the target voltage required by the power battery is less than 5%, and the above state lasts for more than 200ms, the feedback working state is closed at this time, indicating that the power battery is in a normal charging state, otherwise it is determined that a fault occurs and charging is stopped.

[0095] As an embodiment of the present application, before the voltage conversion system is controlled to perform voltage conversion according to the first conversion ratio so that the charging pile charges the power battery, it also includes:

[0096] S340. Fit the voltage range of the power battery according to the first conversion ratio to obtain the fitted voltage range of the power battery, and send the fitted voltage range to the charging pile to complete the handshake configuration verification between the power battery and the charging pile.

[0097] Specifically, when the voltage platforms of the power battery and the charging pile do not match, when the voltage range is sent to the charging pile through the BMS (Battery Management System) based on the power-on instruction, the handshake configuration verification cannot be completed between the two due to the mismatch in the voltage platforms of the power battery and the charging pile. Therefore, the charging process cannot be entered, resulting in the charging pile being unable to directly charge the power battery.

[0098] In this embodiment, the voltage range of the power battery is fitted by a voltage conversion system to obtain the fitted voltage range of the power battery. The voltage platform corresponding to the fitted voltage range matches the voltage platform of the charging pile, so that the handshake configuration verification between the power battery and the charging pile can be completed, thereby broadening the range of charging piles that can be used by the power battery.

[0099] Reference Figure 4 As shown, as an embodiment of the present application, the voltage conversion system is also connected between the power battery and the storage battery system, and the power battery charges the storage battery system through the voltage conversion system; the method also includes:

[0100] S410. Perform voltage platform matching detection on the power battery and the storage battery system to obtain a second matching result.

[0101] S420. If the second matching result indicates that the voltage platforms of the power battery and the battery system do not match, a ratio conversion is performed according to the respective maximum voltages of the power battery and the battery system to obtain a second conversion ratio, and the voltage conversion system is controlled to perform voltage conversion according to the second conversion ratio, so that the power battery charges the battery system.

[0102] Specifically, Figure 2 As shown, the voltage conversion system in this embodiment can also be used between the power battery and the storage battery system, so that the power battery can charge the storage battery system through the voltage conversion system. Figure 2 The power battery, voltage conversion system and DCDC constitute a battery charging circuit, in which the DCDC is connected to the battery system to convert the charging voltage output by the power battery.

[0103] Furthermore, in the process of charging the power battery by the charging pile, when the high-voltage charging circuit is connected based on the power-on instruction, the battery charging circuit is also connected, and whether the battery charging circuit can work normally is detected. When the battery charging circuit works normally, the power battery and the battery system are tested for voltage platform matching. If the second matching result indicates that the voltage platforms of the power battery and the battery system match, the parallel relay is closed, and the battery system is directly charged through the power battery. If the second matching result indicates that the voltage platforms of the power battery and the battery system do not match, the power battery charges the battery system through the voltage conversion system.

[0104] It should be noted that the battery charging circuit and the high-voltage charging circuit are independent of each other. If the battery charging circuit fails, the high-voltage charging circuit can work independently; if the high-voltage charging circuit fails, the battery charging circuit stops working based on the power-off instruction.

[0105] Further, based on the power-off instruction, the DCDC is controlled to stop working and the auxiliary drive relay S6 is disconnected. After the voltage conversion system stops working, the main negative relay S1 is disconnected, and the battery system, the voltage conversion system and the power battery are controlled to enter sleep mode.

[0106] Reference Figure 5 As shown, as an embodiment of the present application, the voltage conversion system is also connected between the power battery and the all-in-one electronic control system, and the power battery supplies power to the all-in-one electronic control system through the voltage conversion system; the method also includes:

[0107] S510. Perform voltage platform matching detection on the power battery and the all-in-one electronic control system to obtain a third matching result.

[0108] S520. If the third matching result indicates that the voltage platforms of the power battery and the all-in-one electronic control system do not match, control the voltage conversion system to perform voltage conversion according to the third conversion ratio so that the power battery supplies power to the all-in-one electronic control system.

[0109] Specifically, Figure 2 As shown, in this embodiment, the voltage conversion system can also be used between the power battery and the all-in-one electronic control system, so that the power battery can charge the all-in-one electronic control system through the voltage conversion system. Figure 2 The power battery, voltage conversion system and all-in-one electronic control system constitute a high-voltage discharge circuit. The all-in-one electronic control system includes steering DCAC, braking DCAC, air conditioning thermal management and upper body. The all-in-one electronic control system is controlled by a motor controller (MCU).

[0110] Furthermore, a voltage platform matching test is performed on the power battery and the all-in-one electronic control system. If the third matching result indicates that the voltage platforms of the power battery and the all-in-one electronic control system match, the parallel relay is closed to directly power the all-in-one electronic control system through the power battery. If the third matching result indicates that the voltage platforms of the power battery and the all-in-one electronic control system do not match, the power battery powers the all-in-one electronic control system through the voltage conversion system.

[0111] Furthermore, when the power battery and the voltage conversion system are connected based on the power-on instruction, and the voltage conversion system works normally, the pre-charging relay S5 is first closed for pre-charging; when the difference between the rear-end voltage and the front-end voltage of the pre-charging relay S5 is less than 10% and lasts for more than 200ms, the main positive relay S4 is closed; when the difference between the rear-end voltage and the front-end voltage of the main positive relay S4 is less than 10% and lasts for more than 200ms, it indicates that the pre-charging is completed, and the pre-charging relay S5 is disconnected. In this embodiment, the influence of the large current generated when the main positive relay S4 is closed on the high-voltage discharge circuit is reduced by pre-charging, and the high-voltage discharge circuit is protected. After the pre-charging is completed, the auxiliary drive relay S6 is closed to connect the high-voltage discharge circuit, and the all-in-one electronic control system is enabled to perform corresponding work in response to driving behavior.

[0112] Furthermore, based on the power-off instruction, the all-in-one electric control system is first controlled to stop working and disconnect the auxiliary drive relay S6, and then disconnect the main positive relay S4. After the voltage conversion system stops working, the main negative relay S1 is disconnected, and the all-in-one electric control system, the voltage conversion system and the power battery are controlled to enter sleep mode.

[0113] Reference Figure 6 As shown, as an embodiment of the present application, the third conversion ratio is obtained according to the following method:

[0114] S522. If the current voltage of the power battery exceeds the rated voltage of the power battery, a third conversion ratio is obtained according to a ratio between the maximum voltage of the power battery and the maximum voltage of the all-in-one electronic control system.

[0115] S524. If the current voltage of the power battery does not exceed the rated voltage of the power battery, a third conversion ratio is obtained according to the ratio of the current voltage of the power battery to the rated voltage of the all-in-one electronic control system.

[0116] Specifically, when the power battery is used to power the all-in-one electric control system, the current voltage of the power battery gradually decreases, and the all-in-one electric control system has a higher working efficiency under high voltage. In order to ensure the normal operation of the all-in-one electric control system, it is necessary to provide it with an input voltage not less than the rated voltage. The third conversion ratio includes:

[0117] Y1=V mmax V bmax

[0118] Wherein, Y1 represents the third conversion ratio when the current voltage of the power battery exceeds the rated voltage; V mmax is the maximum voltage of the all-in-one electronic control system; V bmax is the maximum voltage of the power battery.

[0119] Y2=V m V b

[0120] Wherein, Y2 represents the third conversion ratio when the current voltage of the power battery is the rated voltage; V m is the rated voltage of the all-in-one electronic control system; V b is the rated voltage of the power battery.

[0121] Y3=V m V bmin

[0122] Wherein, Y3 represents the third conversion ratio when the current voltage of the power battery is less than the rated voltage; V bmin It is the minimum voltage of the power battery.

[0123] In the actual discharge process, if the current voltage of the power battery exceeds the rated voltage of the power battery, the voltage conversion system is converted according to Y1 control. After the current voltage of the power battery drops, Y1 gradually approaches Y2 and gradually approaches Y3.

[0124] Accordingly, please refer to Figure 7 , an embodiment of the present application provides a voltage conversion system control device, the device comprising:

[0125] The power-on module 100 is used to connect the power battery and the voltage conversion system based on a power-on instruction.

[0126] The matching module 200 is used to perform voltage platform matching detection on the power battery and the charging pile to obtain a first matching result.

[0127] The conversion module 300 is used to control the voltage conversion system to perform voltage conversion. If the first matching result indicates that the voltage platforms of the power battery and the charging pile do not match, a proportional conversion is performed according to the respective maximum voltages of the power battery and the charging pile to obtain a first conversion ratio, and the voltage conversion system is controlled to perform voltage conversion according to the first conversion ratio, so that the charging pile charges the power battery.

[0128] The power-off module 400 is used to control the voltage conversion system to stop working and disconnect the connection between the charging pile and the power battery based on the power-off instruction.

[0129] In some optional implementations, the conversion module 300 includes:

[0130] The output voltage solving unit is used to solve the voltage according to the current current and current voltage of the power battery to obtain the output voltage of the voltage conversion system.

[0131] The input voltage solving unit is used to proportionally convert the current voltage of the power battery according to the maximum voltage of the power battery and the charging pile respectively, so as to obtain the input voltage of the voltage conversion system.

[0132] The ratio calculation unit is used to perform ratio calculation according to the output voltage and the input voltage to obtain a first conversion ratio.

[0133] In some optional embodiments, the voltage conversion system is connected to one end of the main negative relay, one end of the charging relay and the parallel relay, the other end of the main negative relay is connected to the power battery, the other end of the charging relay is connected to the charging pile, and the parallel relay is connected in parallel with the voltage conversion system; the power-on module 100 includes:

[0134] The first connection unit is used to close the main negative relay based on the power-on instruction to connect the power battery and the voltage conversion system.

[0135] The second connecting unit is used to close the charging relay to connect the charging pile and the voltage conversion system.

[0136] The third connecting unit is used to connect the power battery and the charging pile. If the first matching result indicates that the voltage platforms of the power battery and the charging pile match, the parallel relay connected in parallel with the voltage conversion system is closed to connect the power battery and the charging pile.

[0137] In some optional implementations, the conversion module 300 further includes:

[0138] The handshake configuration verification unit is used to fit the voltage range of the power battery according to the first conversion ratio to obtain the fitted voltage range of the power battery, and send the fitted voltage range to the charging pile to complete the handshake configuration verification between the power battery and the charging pile.

[0139] In some optional embodiments, the voltage conversion system is also connected between the power battery and the storage battery system, and the power battery charges the storage battery system through the voltage conversion system; the device also includes a second conversion module, including:

[0140] The second matching unit is used to perform voltage platform matching detection on the power battery and the storage battery system to obtain a second matching result.

[0141] The second conversion unit is used to control the voltage conversion system to perform voltage conversion. If the second matching result indicates that the voltage platforms of the power battery and the battery system do not match, a ratio conversion is performed according to the respective maximum voltages of the power battery and the battery system to obtain a second conversion ratio, and the voltage conversion system is controlled to perform voltage conversion according to the second conversion ratio, so that the power battery charges the battery system.

[0142] In some optional embodiments, the voltage conversion system is also connected between the power battery and the all-in-one electronic control system, and the power battery supplies power to the all-in-one electronic control system through the voltage conversion system; the device also includes a third conversion module, including:

[0143] The third matching unit is used to perform voltage platform matching detection on the power battery and the all-in-one electronic control system to obtain a third matching result.

[0144] The third conversion unit is used to control the voltage conversion system to perform voltage conversion. If the third matching result indicates that the voltage platforms of the power battery and the all-in-one electronic control system do not match, the voltage conversion system is controlled to perform voltage conversion according to the third conversion ratio, so that the power battery supplies power to the all-in-one electronic control system.

[0145] In some optional implementations, the third conversion unit includes:

[0146] The maximum voltage ratio subunit is used to obtain a third conversion ratio according to the ratio of the maximum voltage of the power battery to the maximum voltage of the all-in-one electronic control system if the current voltage of the power battery exceeds the rated voltage of the power battery.

[0147] The rated voltage ratio subunit is used to obtain a third conversion ratio according to the ratio of the current voltage of the power battery to the rated voltage of the all-in-one electronic control system if the current voltage of the power battery does not exceed the rated voltage of the power battery.

[0148] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0149] The voltage conversion system control device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0150] See also Figure 8 , Figure 8 It is a structural diagram of a controller provided by an embodiment of the present application. As shown in the figure, the controller includes: one or more processors 10, a memory 20, and an interface for connecting various components, including a high-speed interface and a low-speed interface. The various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the controller, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple controllers can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 8 A processor 10 is taken as an example.

[0151] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0152] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0153] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required by at least one function; the data storage area may store data created according to the use of the controller, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the controller via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0154] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0155] The controller further comprises a communication interface 30 for the controller to communicate with other devices or a communication network.

[0156] The embodiment of the present application also provides a vehicle, which includes a power battery and a voltage conversion system control device or controller as described in the above embodiment, and performs voltage conversion through the above voltage conversion system control device or controller to achieve compatibility between devices configured with different voltage platforms. The vehicle may also include a battery system and an all-in-one electric control system, wherein the charging pile and the power battery and voltage conversion system of the vehicle constitute a high-voltage charging circuit, and the power battery, voltage conversion system and all-in-one electric control system of the vehicle constitute a high-voltage discharge circuit.

[0157] The embodiment of the present application also provides a computer-readable storage medium, and the method described in the embodiment of the present application can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0158] The embodiment of the present application provides a computer program product, which includes computer instructions, which are stored in a computer-readable storage medium. A processor of a controller reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the controller executes the method of any embodiment of the present application.

[0159] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

[0160] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0161] For the convenience of description, the above device is described in various units according to their functions. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0162] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0163] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0164] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0165] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0166] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0167] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0168] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

[0169] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A voltage conversion system control method, characterized in that: The voltage conversion system is connected between the power battery and the charging pile, and the charging pile charges the power battery through the voltage conversion system; the method comprises: connecting the power battery and the voltage conversion system based on a power-on instruction; Performing a voltage platform matching test on the power battery and the charging pile to obtain a first matching result; If the first matching result indicates that the voltage platforms of the power battery and the charging pile do not match, a first conversion ratio is obtained by performing a proportional conversion according to the respective maximum voltages of the power battery and the charging pile, and the voltage conversion system is controlled to perform voltage conversion according to the first conversion ratio, so that the charging pile charges the power battery; Based on the power-off instruction, the voltage conversion system is controlled to stop working, and the connection between the charging pile and the power battery is disconnected.

2. The method according to claim 1, characterized in that: The first conversion ratio is obtained according to the following method: Performing voltage calculation according to the current current and the current voltage of the power battery to obtain the output voltage of the voltage conversion system; According to the respective maximum voltages of the power battery and the charging pile, the current voltage of the power battery is proportionally converted to obtain the input voltage of the voltage conversion system; The first conversion ratio is obtained by performing a ratio calculation based on the output voltage and the input voltage.

3. The method according to claim 1, characterized in that: The voltage conversion system is connected to one end of the main negative relay, one end of the charging relay and the parallel relay, the other end of the main negative relay is connected to the power battery, the other end of the charging relay is connected to the charging pile, and the parallel relay is connected in parallel with the voltage conversion system; The method further comprises: Based on the power-on instruction, closing the main negative relay to connect the power battery and the voltage conversion system; Closing the charging relay to connect the charging pile and the voltage conversion system; If the first matching result indicates that the voltage platforms of the power battery and the charging pile match, a parallel relay connected in parallel with the voltage conversion system is closed to connect the power battery and the charging pile.

4. The method according to claim 3, characterized in that Before controlling the voltage conversion system to perform voltage conversion according to the first conversion ratio so that the charging pile charges the power battery, the method further includes: The voltage range of the power battery is fitted according to the first conversion ratio to obtain a fitted voltage range of the power battery, and the fitted voltage range is sent to the charging pile to complete the handshake configuration verification between the power battery and the charging pile.

5. The method according to claim 4, characterized in that The voltage conversion system is also connected between the power battery and the storage battery system, and the power battery charges the storage battery system through the voltage conversion system; the method further includes: Performing a voltage platform matching test on the power battery and the storage battery system to obtain a second matching result; If the second matching result indicates that the voltage platforms of the power battery and the battery system do not match, a second conversion ratio is obtained by performing a proportional conversion based on the respective maximum voltages of the power battery and the battery system, and the voltage conversion system is controlled to perform voltage conversion based on the second conversion ratio, so that the power battery charges the battery system.

6. The method according to claim 1, characterized in that The voltage conversion system is also connected between the power battery and the all-in-one electric control system, and the power battery supplies power to the all-in-one electric control system through the voltage conversion system; the method further includes: Performing a voltage platform matching test on the power battery and the all-in-one electronic control system to obtain a third matching result; If the third matching result indicates that the voltage platforms of the power battery and the all-in-one electronic control system do not match, the voltage conversion system is controlled to perform voltage conversion according to a third conversion ratio so that the power battery supplies power to the all-in-one electronic control system.

7. The method according to claim 6, characterized in that The third conversion ratio is obtained according to the following method: If the current voltage of the power battery exceeds the rated voltage of the power battery, the third conversion ratio is obtained according to the ratio of the maximum voltage of the power battery to the maximum voltage of the all-in-one electronic control system; If the current voltage of the power battery does not exceed the rated voltage of the power battery, the third conversion ratio is obtained according to the ratio of the current voltage of the power battery to the rated voltage of the all-in-one electronic control system.

8. A voltage conversion system control device, characterized in that: The voltage conversion system is connected between the power battery and the charging pile, and the charging pile charges the power battery through the voltage conversion system; the device includes: A power-on module, used to connect the power battery and the voltage conversion system based on a power-on instruction; A matching module, used for performing voltage platform matching detection on the power battery and the charging pile to obtain a first matching result; a conversion module, configured to control the voltage conversion system to perform voltage conversion, and if the first matching result indicates that the voltage platforms of the power battery and the charging pile do not match, perform a ratio conversion according to the respective maximum voltages of the power battery and the charging pile to obtain a first conversion ratio, and control the voltage conversion system to perform voltage conversion according to the first conversion ratio, so that the charging pile charges the power battery; The power-off module is used to control the voltage conversion system to stop working and disconnect the connection between the charging pile and the power battery based on the power-off instruction.

9. A controller, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 7 by executing the computer instructions.

10. A vehicle, characterized in that: It comprises the voltage conversion system control device as claimed in claim 8 or the controller as claimed in claim 9.

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