A charging control method and system for an electric vehicle

Abstract

This application provides a charging control method and system for electric vehicles, relating to the field of electric vehicle technology. The charging control method includes: acquiring operating condition information and charging pile information of the electric vehicle, wherein the electric vehicle includes a power battery, a relay assembly, a DC charging port, an electric drive assembly, and an IGBT module; the relay assembly includes multiple relays, and the IGBT module is connected to the power battery, the DC charging port, and the electric drive assembly through the multiple relays respectively; generating charging strategy data based on the operating condition information and the charging pile information; and adjusting the on / off state of the multiple relays according to the charging strategy data, thereby controlling the electric vehicle to perform normal charging, boost charging, or boost current charging through the on / off state control of the multiple relays. This charging control method for electric vehicles can achieve the technical effects of improving charging adaptability and charging efficiency.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and more specifically, to a charging control method and system for electric vehicles. Background Technology

[0002] Generally, electric vehicles need to be charged through charging stations; however, existing electric vehicle charging methods have the following problems: First, the battery pack voltage is higher than the charging pile voltage, making it impossible to charge. Although most charging piles on the market have been upgraded to 750V, a small number are still 500V. Many electric vehicles on the market are electric vehicles with a high-voltage 500V platform, which cannot be charged at 500V charging piles. Moreover, some electric vehicle battery packs on the market have a high-voltage platform of 800V, and some are close to 1000V or even higher. These electric vehicles also cannot be charged at 750V charging piles. This limits the usage scenarios of electric vehicles and affects the user experience. Secondly, charging piles are limited by their charging output current, preventing them from outputting at maximum power, thus affecting the charging time of electric vehicles. As the charging rate of electric vehicles increases and the charging speed becomes faster, the charging power required for (DC fast charging) increases. However, the output power of charging piles is fixed and limited by hardware (such as charging guns and wiring harnesses), strictly restricting the output current. As the battery pack charge decreases, the battery pack voltage also decreases; similarly, during charging, as the charge increases, the battery pack voltage also increases. In other words, the charging process of an electric vehicle battery pack is a gradual voltage increase. Furthermore, the output voltage of the charging pile needs to be slightly higher than the battery pack voltage. Since the charging power of the battery pack has a fixed limit, the output power of the charging pile also has a limit, but the charging pile does not always output at maximum power during the charging process; the charging pile's output power is limited by its maximum output current. Summary of the Invention

[0003] The purpose of this application is to provide a charging control method, system, electronic device, and computer-readable storage medium for electric vehicles, which can achieve the technical effects of improving charging adaptability and charging efficiency.

[0004] In a first aspect, this application provides a charging control method for an electric vehicle, comprising: The system acquires operating condition information and charging pile information of an electric vehicle, wherein the electric vehicle includes a power battery, a relay assembly, a DC charging port, an electric drive assembly, and an IGBT module. The relay assembly includes multiple relays, and the IGBT module is connected to the power battery, the DC charging port, and the electric drive assembly through the multiple relays respectively. Charging strategy data is generated based on the operating condition information and the charging pile information; The on / off state of the plurality of relays is adjusted according to the charging strategy data, and the electric vehicle is charged normally, charged with boost voltage, or charged with boost current through the on / off control of the plurality of relays.

[0005] In the above implementation process, the electric vehicle charging control method sets up multiple relays in the electric vehicle's circuit. By controlling the on and off of these relays, the input voltage of the charging pile can be boosted and output to the battery pack using the electric drive assembly and IGBT control module, thus achieving boost charging; or the input current of the charging pile can enter from the drive inductor of the electric drive assembly and be output to the power battery from the IGBT module, thus achieving boost charging. In this case, the charging pile can output at its maximum output current, thereby increasing the charging power. Therefore, this electric vehicle charging control method can achieve the technical effects of improving electric adaptability and charging efficiency.

[0006] Furthermore, the relay assembly includes a main positive relay, a main negative relay, a first relay, a second relay, a third relay, and a fourth relay, wherein the main positive relay and the main negative relay are respectively disposed at the positive terminal and the negative terminal of the power battery; One end of the first relay is connected to the DC charging port, and the other end of the first relay is connected to the main positive relay and the IGBT module respectively; One end of the second relay is connected to the electric drive assembly, and the other end of the second relay is connected to one end of the first relay through the third relay; The third relay and the second relay are connected to the main negative relay through a filter capacitor; One end of the fourth relay is connected between the third relay and the second relay, and the other end of the fourth relay is connected between the power battery and the main positive relay.

[0007] In the above implementation process, by controlling the on / off state of the main positive relay, main negative relay, first relay, second relay, third relay and fourth relay, the input voltage of the charging pile is boosted and then output to the battery pack using the electric drive assembly and IGBT control module to achieve boost charging; or the input current of the charging pile enters from the drive inductor of the electric drive assembly and is output to the power battery from the IGBT module to achieve boost charging. At this time, the charging pile can output at the maximum output current to increase the charging power.

[0008] Further, the step of generating charging strategy data based on the operating condition information and the charging pile information includes: Obtain the current battery pack voltage information based on the operating condition information; If the current battery pack voltage is greater than the charging pile voltage, a boost charging strategy is generated, which includes: Close the second and third relays, open the first and fourth relays, and keep the main positive and main negative relays closed. The electric drive assembly and the IGBT module are driven to perform a boost function to charge the power battery.

[0009] In the above implementation process, if the current battery pack voltage is greater than the charging pile voltage, the charging pile voltage must be boosted before charging can begin. At this time, after the electric vehicle receives the voltage and current input from the charging pile, it closes the second and third relays, opens the first and fourth relays, and keeps the main positive and main negative relays closed. Thus, the voltage is boosted by the drive motor to reach the voltage required to charge the battery pack, and then the battery pack is charged, achieving boost charging.

[0010] Further, the step of generating charging strategy data based on the operating condition information and the charging pile information includes: Obtain the current battery pack voltage information based on the operating condition information; If the current battery pack voltage is less than the charging pile voltage, a current-boosting charging strategy is generated, which includes: Close the first, second, and fourth relays, open the third relay, and keep the main positive relay in the open state and the main negative relay in the closed state; The electric drive assembly and the IGBT module are driven to perform a current boosting function to charge the power battery.

[0011] In the above implementation process, if the current battery pack voltage is less than the charging pile voltage, the drive motor performs a current boosting function. The drive motor reduces the output voltage of the charging pile. Since P=UI, with power P remaining constant, the voltage drop U decreases, and the current I increases. Within the battery pack's tolerance range, this allows the charging pile to output more power P. Consequently, the first, second, and fourth relays are closed, the third relay is opened, and the main positive relay remains open while the main negative relay remains closed. This drives the electric drive assembly and IGBT module to perform the current boosting function, providing increased current charging for the power battery and improving charging power.

[0012] Further, the step of adjusting the on / off state of the plurality of relays according to the charging strategy data includes: If the operating condition information of the electric vehicle is normal fast charging condition, then the main positive relay, the main negative relay, and the first relay in the relay assembly are closed, and the second relay, the third relay, and the fourth relay in the relay assembly are open.

[0013] In the above implementation process, if boost charging or boost charging is not required, the electric vehicle will be charged under normal fast charging conditions. Under normal fast charging conditions, the main positive relay, the main negative relay, and the first relay are closed, while the second, third, and fourth relays in the relay assembly are open.

[0014] Further, the step of adjusting the on / off state of the plurality of relays according to the charging strategy data includes: If the operating condition information of the electric vehicle is driving condition or AC slow charging condition, then the main positive relay and the main negative relay in the relay assembly are closed, and the remaining relays in the relay assembly are open.

[0015] In the above implementation process, if the operating condition information of the electric vehicle is driving condition or AC slow charging condition, then boost charging or boost charging will not be performed at this time, the main positive relay and the main negative relay in the control relay assembly will be closed, and the remaining relays in the relay assembly will be opened.

[0016] Secondly, this application provides a charging control system for an electric vehicle, including: The acquisition module is used to acquire the operating condition information and charging pile information of the electric vehicle. The electric vehicle includes a power battery, a relay assembly, a DC charging port, an electric drive assembly, and an IGBT module. The relay assembly includes multiple relays, and the IGBT module is connected to the power battery, the DC charging port, and the electric drive assembly through the multiple relays respectively. The strategy module is used to generate charging strategy data based on the operating condition information and the charging pile information; The control module is used to adjust the on / off state of the plurality of relays according to the charging strategy data, and to control the electric vehicle to perform normal charging, boost charging or boost current charging through the on / off state of the plurality of relays.

[0017] Furthermore, the strategy module is also used for: The step of generating charging strategy data based on the operating condition information and the charging pile information includes: Obtain the current battery pack voltage information based on the operating condition information; If the current battery pack voltage is greater than the charging pile voltage, a boost charging strategy is generated, which includes: Close the second and third relays, open the first and fourth relays, and keep the main positive and main negative relays closed. The electric drive assembly and the IGBT module are driven to perform a boost function to charge the power battery.

[0018] Furthermore, the strategy module is also used for: Obtain the current battery pack voltage information based on the operating condition information; If the current battery pack voltage is less than the charging pile voltage, a current-boosting charging strategy is generated, which includes: Close the first, second, and fourth relays, open the third relay, and keep the main positive relay in the open state and the main negative relay in the closed state; The electric drive assembly and the IGBT module are driven to perform a current boosting function to charge the power battery.

[0019] Furthermore, the control module is also used for: If the operating condition information of the electric vehicle is normal fast charging condition, then the main positive relay, the main negative relay, and the first relay in the relay assembly are closed, and the second relay, the third relay, and the fourth relay in the relay assembly are open.

[0020] Furthermore, the control module is also used for: If the operating condition information of the electric vehicle is driving condition or AC slow charging condition, then the main positive relay and the main negative relay in the relay assembly are closed, and the remaining relays in the relay assembly are open.

[0021] Thirdly, this application provides an electronic device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of the method described in any of the first aspects.

[0022] Fourthly, this application provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the method described in any of the first aspects.

[0023] Fifthly, this application provides a computer program product that, when run on a computer, causes the computer to perform the method described in any of the first aspects.

[0024] Other features and advantages disclosed in this application will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described technology disclosed in this application.

[0025] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic flowchart illustrating a charging control method for an electric vehicle provided in an embodiment of this application; Figure 2 A schematic diagram of the power battery circuit provided in an embodiment of this application; Figure 3 This is a schematic diagram of the process of applying high voltage as provided in the embodiments of this application; Figure 4 A flowchart illustrating the driving conditions provided in the embodiments of this application; Figure 5 A schematic diagram of the AC charging operation provided in the embodiments of this application; Figure 6 A schematic diagram of the DC charging operation provided in the embodiments of this application; Figure 7 A schematic diagram of the boost DC charging operation provided in the embodiments of this application; Figure 8 A schematic diagram of the current boost DC charging operation provided in the embodiments of this application; Figure 9 A structural block diagram of a charging control system for an electric vehicle provided in an embodiment of this application; Figure 10 This is a structural block diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0029] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Generally, electric vehicles need to be charged through charging stations; however, existing electric vehicle charging methods have the following problems: Problem 1: The battery pack voltage is higher than the charging station voltage, causing it to be unable to charge; 1. Although most charging piles on the market have been upgraded to 750V charging piles, a small number of piles are still 500V charging piles; and many of the vehicles on the market are electric vehicles with a high voltage 500V platform, which cannot be charged at 500V charging piles. 2. Some electric vehicle battery packs on the market have a voltage platform of 800V, and some are close to 1000V or even higher. These electric vehicles cannot be charged at 750V charging stations, which limits the use scenarios of electric vehicles and affects the user experience. Question 2: Charging piles are limited by the charging output current and cannot output at maximum power, which affects the charging time of electric vehicles; 1. Electric vehicles are charging at increasingly higher rates and faster speeds, which in turn leads to a greater demand for charging power (DC fast charging); however, the output power of charging piles is fixed and is limited by hardware equipment (such as charging guns and wiring harnesses), which strictly limits the output current. 2. As the battery pack charge decreases in an electric vehicle, the battery pack voltage also decreases; similarly, during charging, as the battery pack charge increases, the battery pack voltage also increases. In other words, the charging process of an electric vehicle's battery pack is a process of gradual voltage increase. 3. When a charging station charges an electric vehicle's battery pack, the output voltage of the charging station needs to be slightly higher than the voltage of the battery pack. 4. The charging power of the battery pack has a fixed limit, and the output power of the charging pile also has a limit. However, the charging pile does not always output at the maximum power during the charging process; the output power of the charging pile is limited by the maximum output current. For example, the current acceptable charging power of an electric vehicle battery pack is 120kW (current voltage 400V, acceptable charging current 300A); however, the current output power of the charging pile is only 101kW (output voltage 405V, maximum output current 250A), while the rated power of the charging pile is 120kW (maximum output voltage 750V, maximum output current 250A) (parameters of a certain brand of charging pile on the market). The charging pile is not continuously outputting at its rated power.

[0031] To address the aforementioned technical problems, embodiments of this application provide a charging control method, system, electronic device, and computer-readable storage medium for electric vehicles. This charging control method for electric vehicles incorporates multiple relays in the electric vehicle's circuitry. By controlling the on / off states of these relays, the input voltage of the charging pile can be boosted and output to the battery pack using the electric drive assembly and IGBT control module, achieving boost charging. Alternatively, the input current of the charging pile can enter from the drive inductor of the electric drive assembly and be output to the power battery from the IGBT module, achieving current-boosting charging. In this case, the charging pile can output its maximum current, thereby increasing the charging power. Thus, this charging control method for electric vehicles achieves the technical effects of improving electrical adaptability and charging efficiency.

[0032] Please see Figure 1 , Figure 1 This is a flowchart illustrating a charging control method for an electric vehicle provided in an embodiment of this application. The charging control method for the electric vehicle includes the following steps: S100: Acquires operating condition information and charging pile information of electric vehicles. The electric vehicle includes a power battery, relay assembly, DC charging port, electric drive assembly and IGBT module. The relay assembly includes multiple relays. The IGBT module is connected to the power battery, DC charging port and electric drive assembly through multiple relays respectively. S200: Generates charging strategy data based on operating condition information and charging pile information; S300: Adjusts the on / off state of multiple relays according to charging strategy data, and controls the electric vehicle to perform normal charging, boost charging, or boost current charging through the on / off state of multiple relays.

[0033] For example, in the circuit of an electric vehicle, the electric drive assembly and the IGBT module are connected, and the power battery is connected to the DC charging port, the electric drive assembly, and the IGBT module respectively through multiple relays of the relay assembly; thus, by controlling the on and off of multiple relays, the circuit structure of the electric vehicle can be adjusted to achieve different circuit functions, such as normal charging, boost charging, and boost current charging.

[0034] For example, the boost principle is to use the inductor and IGBT module of the electric drive assembly to boost the input voltage of the charging pile and then output it to the battery pack. Its advantage is that it shares the components of the electric drive, which can effectively improve the utilization rate of components and reduce the overall system cost. For example, the principle of boost current is the reverse of the principle of boost voltage. In the boost principle, the output current of the charging pile enters from the IGBT module of the electric drive assembly, is boosted by the drive inductor, and is then output to the battery pack. In the current boost principle, the current enters from the drive inductor of the drive motor and is output to the battery pack from the IGBT control module. In essence, this is a step-down process.

[0035] Although it is a step-down charging, the charging station can output at the maximum output current, and the output voltage can be higher than that of directly charging the battery pack. In other words, the charging station can output higher power, and the charging power received by the battery pack can also be higher than that of direct charging by the charging station.

[0036] The electric vehicle charging control method provided in this application embodiment involves setting multiple relays in the electric vehicle's circuitry. By controlling the on / off state of these relays, the input voltage of the charging pile can be boosted and output to the battery pack using the electric drive assembly and IGBT control module, achieving boost charging. Alternatively, the input current of the charging pile can enter from the drive inductor of the electric drive assembly and be output to the power battery from the IGBT module, achieving boost charging. In this case, the charging pile can output at its maximum output current, thereby increasing the charging power. Thus, this electric vehicle charging control method can achieve the technical effects of improving electric adaptability and charging efficiency.

[0037] Please see Figure 2 , Figure 2 This is a schematic diagram of a power battery circuit provided in an embodiment of this application; the power battery circuit includes a power battery, a relay assembly, a DC charging port, an electric drive assembly, and an IGBT module; For the sake of simplicity, the on-board charger (OBC) for AC charging is categorized under "Other High-Voltage Components of the Vehicle" in the diagram. The pre-charge relay and pre-charge resistor only function when the vehicle is connected to high-voltage electricity. For example, when the vehicle is connected to high-voltage electricity, first close the main negative relay and the pre-charge relay; after the voltage stabilizes, close the main positive relay; after the voltage stabilizes, open the pre-charge relay (unless other relays are mentioned, they are considered to be in the open state). C1: Electric drive assembly X capacitor, used for filtering, discharging residual electrical energy, pre-charging, and other functions; C2: Filter capacitor, used for filtering during the voltage and current boosting process.

[0038] In some embodiments, the relay assembly includes a main positive relay, a main negative relay, a first relay, a second relay, a third relay, and a fourth relay, with the main positive relay and the main negative relay respectively disposed at the positive terminal and the negative terminal of the power battery; One end of the first relay is connected to the DC charging port, and the other end of the first relay is connected to the main positive relay and the IGBT module respectively; One end of the second relay is connected to the electric drive assembly, and the other end of the second relay is connected to one end of the first relay through the third relay; The third relay and the second relay are connected to the main negative relay through a filter capacitor; One end of the fourth relay is connected between the third and second relays, and the other end of the fourth relay is connected between the power battery and the main positive relay.

[0039] For example, by controlling the on / off states of the main positive relay, main negative relay, first relay, second relay, third relay, and fourth relay, the input voltage of the charging pile is boosted and output to the battery pack using the electric drive assembly and IGBT control module, thus achieving boost charging; or the input current of the charging pile enters from the drive inductor of the electric drive assembly and is output to the power battery from the IGBT module, thus achieving boost charging. In this case, the charging pile can output at its maximum output current, thereby increasing the charging power.

[0040] In some implementations, S200: the step of generating charging strategy data based on operating condition information and charging pile information includes: Obtain the current battery pack voltage information based on operating condition information; If the current battery pack voltage is greater than the charging station voltage, a boost charging strategy is generated. The boost charging strategy includes: Close the second and third relays, open the first and fourth relays, and keep the main positive and main negative relays closed. The drive electric drive assembly and IGBT module perform boost charging to charge the power battery.

[0041] For example, if the current battery pack voltage is greater than the charging pile voltage, the charging pile voltage must be boosted before charging can begin. At this time, after the electric vehicle receives the voltage and current input from the charging pile, it closes the second and third relays, opens the first and fourth relays, and keeps the main positive and main negative relays closed. This allows the voltage to be boosted by the drive motor to reach the voltage required to charge the battery pack before charging the battery pack, thus achieving boost charging.

[0042] In some implementations, S200: the step of generating charging strategy data based on operating condition information and charging pile information includes: Obtain the current battery pack voltage information based on operating condition information; If the current battery pack voltage is lower than the charging station voltage, a current boosting charging strategy is generated. The current boosting charging strategy includes: Close the first, second, and fourth relays, open the third relay, and keep the main positive relay in the open state and the main negative relay in the closed state; The drive electric drive assembly and IGBT module perform a boost current function to charge the power battery.

[0043] For example, if the current battery pack voltage is less than the charging pile voltage, the drive motor performs a current boosting function. The drive motor reduces the output voltage of the charging pile because P=UI; with power P remaining constant, the voltage drop U decreases, and the current I increases. Within the battery pack's tolerance, this allows the charging pile to output more power P. Consequently, the first, second, and fourth relays are closed, the third relay is opened, and the main positive relay remains open while the main negative relay remains closed, driving the electric drive assembly and IGBT module to perform the current boosting function, thus increasing the charging power by boosting the current of the power battery.

[0044] In some implementations, S300: the step of adjusting the on / off state of multiple relays according to charging strategy data includes: If the electric vehicle's operating condition information indicates normal fast charging, then the main positive relay, main negative relay, and first relay in the relay assembly will be closed, while the second, third, and fourth relays in the relay assembly will be open.

[0045] For example, if boost charging or boost charging is not required, the electric vehicle is charged under normal fast charging conditions. Under normal fast charging conditions, the main positive relay, the main negative relay, and the first relay are closed, while the second, third, and fourth relays in the relay assembly are open.

[0046] In some implementations, S300: the step of adjusting the on / off state of multiple relays according to charging strategy data includes: If the electric vehicle's operating condition information is driving condition or AC slow charging condition, then the main positive relay and main negative relay in the relay assembly are closed, and the remaining relays in the relay assembly are open.

[0047] For example, if the operating condition information of the electric vehicle is driving condition or AC slow charging condition, then boost charging or boost charging is not performed at this time, the main positive relay and the main negative relay in the control relay assembly are closed, and the remaining relays in the relay assembly are open.

[0048] In some implementation scenarios, combined with Figure 1 The electric vehicle charging control method shown and Figure 2 The electric vehicle circuit shown is illustrated with an example of a specific implementation strategy: Table 1 - Relay Control Logic Table

[0049] The vehicle's operating conditions are switched using the relay control logic in the table above. 1. High-voltage power supply procedure; please refer to [link / reference]. Figure 3 , Figure 3 This is a schematic diagram of the process of applying high voltage as provided in the embodiments of this application; 2. Driving conditions; please refer to Figure 4 , Figure 4 A flowchart illustrating the driving conditions provided in the embodiments of this application; 3. AC charging conditions; please refer to [link / reference]. Figure 5 , Figure 5 A schematic diagram of the AC charging operation provided in the embodiments of this application; 4. DC charging operation; please refer to Figure 6 , Figure 6 A schematic diagram of the DC charging operation provided in the embodiments of this application; 5. Boost DC charging; please refer to [link / reference]. Figure 7 , Figure 7 A schematic diagram of the boost DC charging operation provided in the embodiments of this application; S51: Triggering entry into boost DC charging; A typical scenario is as follows: the current battery pack voltage is 600V, but the charging station used is a 500V output station. The charging station cannot directly charge the electric vehicle, triggering the vehicle's boost charging function. S52: High-voltage electricity on the whole vehicle (a prerequisite for DC charging). S53: Determine whether the vehicle meets the DC charging conditions (e.g., consider the fault status of each high-voltage component, battery status, etc.). S54: When the vehicle does not meet the conditions for DC charging, a corresponding fault warning will be issued; S55: Close relays K2 and K3; keep relays K1 and K4 open; keep the main positive relay and main negative relay closed; S56: Perform the necessary communication handshake for the DC charging process in accordance with national standards; S57: The Battery Management System (BMS) sends voltage and current requests to the charging station; To reduce the voltage boosting burden on the vehicle, the charging station is typically requested to output at its maximum voltage and current. After receiving the voltage and current input from the charging station, the vehicle first uses the drive motor to boost the voltage to the level required to charge the battery pack before charging the battery pack. S58: Drives the motor to perform boost function; S59: Charge the battery pack; 6. Boost DC charging; please refer to [link / reference]. Figure 8 , Figure 8 A schematic diagram of the current boost DC charging operation provided in the embodiments of this application; S61: Triggering entry into boost DC charging; Typical scenarios include: the current battery pack voltage is 400V, and the allowable charging current is 300A; the charging pile has a rated output of 120kW, a maximum allowable output voltage of 750V, and a maximum allowable output current of 250A. If charged using normal DC charging, the charging pile outputs 403V and the charging current is 250A, at which point the battery pack's charging power is 100kW. When performing boost (buck) DC charging, the vehicle requests the charging station to output 480V voltage and 250A current (output power of 120kW). Even considering the electric drive boost loss and assuming an effective power of 95%, the charging power to the battery is 120kW * 95% = 114kW, which is higher than the power of normal DC charging (100kW). The battery pack will charge faster. S62: High-voltage electricity on the whole vehicle (a prerequisite for DC charging). S63: Determine whether the vehicle meets the DC charging conditions (e.g., consider the fault status of each high-voltage component, battery status, etc.). S64: When the vehicle does not meet the conditions for DC charging, a corresponding fault warning will be issued; S65: Close relays K1, K2, and K4; keep relay K3 open; keep the main negative relay closed; open the main positive relay; S66: Perform the necessary communication handshake for the DC charging process in accordance with national standards; S67: The Battery Management System (BMS) sends voltage and current requests to the charging station; Generally, the BMS will request the charging station to output power at the maximum power level to improve the charging efficiency of the battery pack. Generally, the charging capacity of a battery pack is stronger than the output capacity of a charging station. S68: The drive motor performs a current boosting function (the drive motor reduces the output voltage of the charging pile. Since P=UI, the power P remains unchanged, the voltage drop U decreases, and the current I increases; within the battery pack's capacity, this allows the charging pile to output more power P). S69: Charge the battery pack.

[0050] Please see Figure 9 , Figure 9 This application provides a structural block diagram of a charging control system for an electric vehicle, which includes: The acquisition module 100 is used to acquire the operating condition information and charging pile information of the electric vehicle. The electric vehicle includes a power battery, a relay assembly, a DC charging port, an electric drive assembly, and an IGBT module. The relay assembly includes multiple relays, and the IGBT module is connected to the power battery, the DC charging port, and the electric drive assembly through multiple relays respectively. Strategy module 200 is used to generate charging strategy data based on operating condition information and charging pile information; The control module 300 is used to adjust the on / off state of multiple relays according to the charging strategy data, and to control the electric vehicle to perform normal charging, boost charging or boost current charging through the on / off state of multiple relays.

[0051] In some implementations, the strategy module 200 is also used for: The steps for generating charging strategy data based on operating condition information and charging pile information include: Obtain the current battery pack voltage information based on operating condition information; If the current battery pack voltage is greater than the charging station voltage, a boost charging strategy is generated. The boost charging strategy includes: Close the second and third relays, open the first and fourth relays, and keep the main positive and main negative relays closed. The drive electric drive assembly and IGBT module perform boost charging to charge the power battery.

[0052] In some implementations, the strategy module 200 is also used for: Obtain the current battery pack voltage information based on operating condition information; If the current battery pack voltage is lower than the charging station voltage, a current boosting charging strategy is generated. The current boosting charging strategy includes: Close the first, second, and fourth relays, open the third relay, and keep the main positive relay in the open state and the main negative relay in the closed state; The drive electric drive assembly and IGBT module perform a boost current function to charge the power battery.

[0053] In some implementations, the control module 300 is also used for: If the electric vehicle's operating condition information indicates normal fast charging, then the main positive relay, main negative relay, and first relay in the relay assembly will be closed, while the second, third, and fourth relays in the relay assembly will be open.

[0054] In some implementations, the control module 300 is also used for: If the electric vehicle's operating condition information is driving condition or AC slow charging condition, then the main positive relay and main negative relay in the relay assembly are closed, and the remaining relays in the relay assembly are open.

[0055] It should be noted that the electric vehicle charging control system provided in this application embodiment is similar to... Figures 1 to 8 The method embodiments shown correspond to each other, and will not be described again here to avoid repetition.

[0056] This application also provides an electronic device, please refer to [link to application]. Figure 10 , Figure 10 This is a structural block diagram of an electronic device provided in an embodiment of this application. The electronic device may include a processor 510, a communication interface 520, a memory 530, and at least one communication bus 540. The communication bus 540 is used to enable direct communication between these components. In this embodiment, the communication interface 520 of the electronic device is used for signaling or data communication with other node devices. The processor 510 may be an integrated circuit chip with signal processing capabilities.

[0057] The processor 510 described above can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor, or the processor 510 can be any conventional processor.

[0058] The memory 530 may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc. The memory 530 stores computer-readable instructions. When these computer-readable instructions are executed by the processor 510, the electronic device can perform the aforementioned operations. Figures 1 to 8 The various steps involved in the method implementation examples.

[0059] Alternatively, the electronic device may also include a storage controller and an input / output unit.

[0060] The memory 530, storage controller, processor 510, peripheral interface, and input / output unit are electrically connected directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses 540. The processor 510 is used to execute executable modules stored in the memory 530, such as software function modules or computer programs included in electronic devices.

[0061] The input / output unit is used to provide users with the ability to create tasks and to set optional start periods or preset execution times for those tasks, thereby enabling user-server interaction. The input / output unit may be, but is not limited to, a mouse and keyboard.

[0062] Understandable. Figure 9 The structure shown is for illustrative purposes only; the electronic device may also include components that are more advanced than those shown. Figure 9 The more or fewer components shown, or having the same Figure 9 The different configurations shown. Figure 9 The components shown can be implemented using hardware, software, or a combination thereof.

[0063] This application also provides a storage medium storing instructions. When the instructions are run on a computer, the computer program is executed by a processor to implement the method described in the method embodiment. To avoid repetition, the method will not be described again here.

[0064] This application also provides a computer program product that, when run on a computer, causes the computer to perform the method described in the method embodiment.

[0065] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0066] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0067] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0068] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0069] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A charging control method for an electric vehicle, characterized in that, include: The system acquires operating condition information and charging pile information of an electric vehicle, wherein the electric vehicle includes a power battery, a relay assembly, a DC charging port, an electric drive assembly, and an IGBT module. The relay assembly includes multiple relays, and the IGBT module is connected to the power battery, the DC charging port, and the electric drive assembly through the multiple relays respectively. Charging strategy data is generated based on the operating condition information and the charging pile information; The on / off state of the plurality of relays is adjusted according to the charging strategy data, and the electric vehicle is charged normally, charged with boost voltage, or charged with boost current through the on / off state control of the plurality of relays. The relay assembly includes a main positive relay, a main negative relay, a first relay, a second relay, a third relay, and a fourth relay. The main positive relay and the main negative relay are respectively disposed at the positive terminal and the negative terminal of the power battery. One end of the first relay is connected to the DC charging port, and the other end of the first relay is connected to the main positive relay and the IGBT module respectively; One end of the second relay is connected to the electric drive assembly, and the other end of the second relay is connected to one end of the first relay through the third relay; The third relay and the second relay are connected to the main negative relay through a filter capacitor; One end of the fourth relay is connected between the third relay and the second relay, and the other end of the fourth relay is connected between the power battery and the main positive relay; The step of generating charging strategy data based on the operating condition information and the charging pile information includes: Obtain the current battery pack voltage information based on the operating condition information; If the current battery pack voltage is greater than the charging pile voltage, a boost charging strategy is generated, which includes: Close the second and third relays, open the first and fourth relays, and keep the main positive and main negative relays closed. The electric drive assembly and the IGBT module are driven to perform a boost function to charge the power battery.

2. The charging control method for an electric vehicle according to claim 1, characterized in that, The step of generating charging strategy data based on the operating condition information and the charging pile information includes: Obtain the current battery pack voltage information based on the operating condition information; If the current battery pack voltage is less than the charging pile voltage, a current-boosting charging strategy is generated, which includes: Close the first, second, and fourth relays, open the third relay, and keep the main positive relay in the open state and the main negative relay in the closed state; The electric drive assembly and the IGBT module are driven to perform a current boosting function to charge the power battery.

3. The charging control method for electric vehicles according to claim 1, characterized in that, The step of adjusting the on / off state of the plurality of relays according to the charging strategy data includes: If the operating condition information of the electric vehicle is normal fast charging condition, then the main positive relay, the main negative relay, and the first relay in the relay assembly are closed, and the second relay, the third relay, and the fourth relay in the relay assembly are open.

4. The charging control method for an electric vehicle according to claim 1, characterized in that, The step of adjusting the on / off state of the plurality of relays according to the charging strategy data includes: If the operating condition information of the electric vehicle is driving condition or AC slow charging condition, then the main positive relay and the main negative relay in the relay assembly are closed, and the remaining relays in the relay assembly are open.

5. A charging control system for an electric vehicle, characterized in that, include: The acquisition module is used to acquire the operating condition information and charging pile information of the electric vehicle. The electric vehicle includes a power battery, a relay assembly, a DC charging port, an electric drive assembly, and an IGBT module. The relay assembly includes multiple relays, and the IGBT module is connected to the power battery, the DC charging port, and the electric drive assembly through the multiple relays respectively. The strategy module is used to generate charging strategy data based on the operating condition information and the charging pile information; The control module is used to adjust the on / off state of the plurality of relays according to the charging strategy data, and to control the electric vehicle to perform normal charging, boost charging or boost current charging through the on / off state of the plurality of relays. The relay assembly includes a main positive relay, a main negative relay, a first relay, a second relay, a third relay, and a fourth relay. The main positive relay and the main negative relay are respectively disposed at the positive terminal and the negative terminal of the power battery. One end of the first relay is connected to the DC charging port, and the other end of the first relay is connected to the main positive relay and the IGBT module respectively; One end of the second relay is connected to the electric drive assembly, and the other end of the second relay is connected to one end of the first relay through the third relay; The third relay and the second relay are connected to the main negative relay through a filter capacitor; One end of the fourth relay is connected between the third relay and the second relay, and the other end of the fourth relay is connected between the power battery and the main positive relay; The strategy module is also used for: The step of generating charging strategy data based on the operating condition information and the charging pile information includes: Obtain the current battery pack voltage information based on the operating condition information; If the current battery pack voltage is greater than the charging pile voltage, a boost charging strategy is generated, which includes: Close the second and third relays, open the first and fourth relays, and keep the main positive and main negative relays closed. The electric drive assembly and the IGBT module are driven to perform a boost function to charge the power battery.

6. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of the charging control method for an electric vehicle as described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that, when executed on a computer, cause the computer to perform the charging control method for an electric vehicle as described in any one of claims 1 to 4.

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