Charging and discharging control method, controller, charging and discharging system, and vehicle

Abstract

A charging and discharging control method, comprising: acquiring working parameters of a charging and discharging system (100), and performing charging and discharging according to a charging and discharging strategy matching the working parameters. The present application further relates to a controller (200), the charging and discharging system (100), and a vehicle (300). By implementing the charging and discharging control method for the charging and discharging system (100), charging and discharging can be performed according to the charging and discharging strategy matching the working parameters of the charging and discharging system (100), so that a better charging and discharging strategy in the current state can be selected on the basis of the working parameters, thereby improving the charging and discharging efficiency and / or shortening the charging and discharging duration.

Description

Charging and discharging control methods, controllers, charging and discharging systems, and vehicles

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411219870.8, filed on August 30, 2024, entitled “Charging and discharging control method, controller, charging and discharging system and vehicle”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery management technology, and in particular to a charging and discharging control method, controller, charging and discharging system, and vehicle. Background Technology

[0004] With the development of charging and discharging technology, the requirements for charging and discharging are becoming increasingly stringent. Charging and discharging refers to the energy conversion and storage process during the charging and discharging processes.

[0005] However, with increasing demands for charging and discharging, current charging and discharging strategies are no longer sufficient to meet the requirements. Summary of the Invention

[0006] This application provides a charging and discharging control method, controller, charging and discharging system, and vehicle, which improves charging and discharging efficiency and / or charging and discharging duration, thereby at least partially solving the above-mentioned technical problems.

[0007] To achieve the above objectives, according to a first aspect of this application, a charge-discharge control method is provided, which is applied to a charge-discharge system. The charge-discharge control method includes: acquiring operating parameters of the charge-discharge system, including at least one of the state of charge of the battery pack, the temperature of the battery pack, and the charge-discharge stage of the charge-discharge system; and performing charge-discharge according to a charge-discharge strategy matched with the operating parameters.

[0008] In some embodiments of this application, the charge-discharge strategy includes a charge-discharge mode, which includes at least one of a power mode and an efficiency mode. The operating parameters include charge-discharge phases, and the charge-discharge strategy matching the operating parameters includes a charge-discharge mode matching the charge-discharge phases of the operating parameters.

[0009] In some embodiments of this application, the charging and discharging phase includes a first phase, a second phase, and a third phase performed sequentially in time. If the charging and discharging phase is the second phase, the charging and discharging mode of the charging and discharging strategy matched with the second phase is the power mode; if the charging and discharging phase is the first phase or the third phase, the charging and discharging mode of the charging and discharging strategy matched with the first phase or the third phase is the efficiency mode.

[0010] In some embodiments of this application, the first stage is the starting stage of charging, the third stage is the ending stage of charging, and the second stage is the intermediate stage of charging.

[0011] In some embodiments of this application, the operating parameters also include the state of charge (SOC) of the battery pack. If the SOC is low or high, the corresponding charging and discharging strategy uses an efficiency mode. If the SOC is medium, the corresponding charging and discharging strategy uses a power mode. The low SOC refers to the state of the battery pack within a first SOC range, the medium SOC refers to the state of the battery pack within a second SOC range, and the high SOC refers to the state of the battery pack within a third SOC range. The upper limit of the first SOC range is less than or equal to the lower limit of the second SOC range, and the lower limit of the third SOC range is greater than or equal to the upper limit of the second SOC range.

[0012] In some embodiments of this application, the operating parameters also include the temperature of the battery pack. If the temperature of the battery pack is within a preset temperature range, the charging and discharging mode of the charging and discharging strategy matching the operating parameters is the power mode; if the temperature of the battery pack is outside the preset temperature range, the charging and discharging mode of the charging and discharging strategy matching the operating parameters is the efficiency mode.

[0013] In some embodiments of this application, the operating parameters also include the electrical device parameters of one or more electrical devices in the charging and discharging system. The electrical device parameters include at least one of the temperature, current, and voltage of the electrical device, and are used to determine the current range in the charging and discharging strategy.

[0014] In some embodiments of this application, the current range includes a maximum charge / discharge current, which is determined based on the allowable charge / discharge current of one or more electrical devices.

[0015] In some embodiments of this application, the maximum charge / discharge current is the minimum value among the maximum allowable charge / discharge current values ​​of one or more electrical devices and the battery pack.

[0016] In some embodiments of this application, one or more electrical devices include one or more of a motor, a motor controller, and a charger connected to the charging / discharging interface of the charging / discharging system.

[0017] In some embodiments of this application, the charging method of the power mode includes a mode that prioritizes charging power; and / or, the charging method of the efficiency mode includes a mode that prioritizes charging efficiency.

[0018] In some embodiments of this application, in efficiency mode, the charge / discharge voltage is determined based on the temperature of the battery pack, the state of charge of the battery pack, and / or, in power mode, the charge / discharge voltage is determined based on the maximum supported voltage of the battery pack and the maximum supported charge / discharge voltage of the device connected to the charge / discharge interface.

[0019] In some embodiments of this application, the charging and discharging system includes a charging and discharging interface and a drive motor. If the stator winding temperature of the drive motor is greater than or equal to a first stator threshold temperature, and / or the rotor temperature of the drive motor is greater than or equal to a first rotor threshold temperature, the charging and discharging strategy includes reducing the charging and discharging voltage of the charging and discharging interface.

[0020] In some embodiments of this application, the charging and discharging system includes a charging and discharging interface and a drive motor. If the stator winding temperature of the drive motor is less than or equal to a second stator threshold temperature, and / or the rotor temperature of the drive motor is less than or equal to a second rotor threshold temperature, the charging and discharging strategy includes increasing the charging and discharging voltage of the charging and discharging interface.

[0021] In some embodiments of this application, the charging and discharging system further includes a drive motor and a motor controller. If the maximum charging and discharging current is less than the maximum current allowed by one phase winding of the drive motor at the current temperature, the charging and discharging strategy includes increasing the carrier frequency of the motor controller and controlling one phase winding to charge and discharge.

[0022] In some embodiments of this application, the relationship between the maximum charging / discharging current and the carrier frequency is an inverse relationship.

[0023] In some embodiments of this application, the charging and discharging system includes an electrical device and a heat dissipation subsystem for dissipating heat from the electrical device. When the temperature of the electrical device is within a threshold range, the heat dissipation subsystem is in a closed state.

[0024] In some embodiments of this application, the charging and discharging system further includes a drive motor and a motor controller. When the maximum charging and discharging current is greater than the maximum current allowed by one phase winding of the drive motor at the current temperature, the charging and discharging strategy includes controlling the multi-phase windings of the drive motor to charge and discharge.

[0025] According to a second aspect of this application, a controller is provided, the controller including a processor connected to a memory for storing a computer program, and the processor for executing the computer program to implement the above-described charge-discharge control method.

[0026] According to a third aspect of this application, a charging and discharging system is provided, including a battery pack, a drive motor, a motor controller, and a charging and discharging interface, wherein the charging and discharging system is configured to be connected to the controller.

[0027] It is understandable that the charging and discharging system can execute a charging and discharging strategy that matches the operating parameters of the charging and discharging system based on the controller's control commands.

[0028] According to a fourth aspect of this application, a vehicle is also provided, the vehicle including the aforementioned controller or charging / discharging system.

[0029] The charging and discharging control method, controller, charging and discharging system, and vehicle of this application embodiment can charge and discharge according to a charging and discharging strategy that matches the working parameters of the charging and discharging system by implementing the charging and discharging control method. This allows for the selection of a better charging and discharging strategy under the current state based on the working parameters, thereby improving charging and discharging efficiency and / or charging and discharging time.

[0030] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0033] Figure 1 is a schematic flowchart of the charging and discharging control method provided in an exemplary embodiment of this disclosure;

[0034] Figure 2 is a schematic diagram of the charging and discharging system provided in an exemplary embodiment of this disclosure;

[0035] Figure 3 is a schematic diagram of the controller provided in an exemplary embodiment of this disclosure;

[0036] Figure 4 is a structural schematic diagram of a vehicle provided in an exemplary embodiment of this disclosure. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0038] This application provides a charge / discharge control method, as shown in FIG1. ​​This charge / discharge control method is applied to a charge / discharge system and includes the following steps:

[0039] Step S10: Obtain the operating parameters of the charging and discharging system. The operating parameters include at least one of the following: the supercapacitor state of charge (SOC) of the battery pack, the temperature of the battery pack, and the charging and discharging stage of the charging and discharging system.

[0040] Step S20: Charge and discharge according to the charge and discharge strategy that matches the operating parameters.

[0041] It is understood that by implementing a charging and discharging control method on the charging and discharging system, the present application embodiments can charge and discharge according to a charging and discharging strategy that matches the operating parameters of the charging and discharging system. This allows for the selection of a better charging and discharging strategy under the current conditions based on the operating parameters, thereby improving charging and discharging efficiency and / or charging and discharging duration.

[0042] Charging and discharging can include at least one of charging and discharging. A charging and discharging phase can include at least one of a charging phase and a discharging phase. A charging and discharging strategy can include at least one of a charging strategy and a discharging strategy. A corresponding charging strategy is implemented during the charging phase, and a corresponding discharging strategy is implemented during the discharging phase.

[0043] In one embodiment, the charge / discharge strategy includes a charge / discharge mode, which includes at least one of a power mode and an efficiency mode, and the operating parameters include charge / discharge phases. The charge / discharge strategy matched with the operating parameters includes a charge / discharge mode matched with the charge / discharge phases of the operating parameters.

[0044] In some embodiments of this application, the charge / discharge mode may include at least one of a charging mode and a discharging mode.

[0045] The power mode prioritizes charging and discharging power. The efficiency mode includes a charging and discharging efficiency priority mode. This allows for selection of efficiency or power priority based on operating parameters, ensuring charging performance while balancing charging efficiency and power requirements.

[0046] Optionally, the power mode can be a mode that prioritizes charging and discharging with the maximum allowable charging and discharging power, and the efficiency mode can be a mode that prioritizes charging and discharging with the maximum allowable charging and discharging efficiency.

[0047] For example, in power mode, charging and discharging can be performed at or near the maximum permissible power to shorten the charging and discharging completion time. In efficiency mode, charging and discharging can be performed at or near the maximum permissible power to improve charging and discharging efficiency.

[0048] The efficiency mode is explained as follows:

[0049] It is understandable that as the battery pack's SOC rises to the first SOC threshold, the required charging power decreases. As the battery pack's SOC falls to the second SOC threshold, the available discharging power decreases.

[0050] During charging, if the battery pack's State of Charge (SOC) rises to a first SOC threshold and charging continues at maximum power, charging efficiency will decrease. In some embodiments, after the battery pack's SOC reaches the first SOC threshold, the charging station can be controlled to charge at the minimum voltage required to meet the battery pack's charging needs, thereby improving charging efficiency. For example, if the charging station voltage is 750V, the battery pack voltage is 450V, and the battery pack's charging current requirement is 50A, after the battery pack's SOC reaches the first SOC threshold, the charging station's output voltage and current can be reduced to 500V × 45A for charging. Compared to 750V, this can significantly improve charging or discharging efficiency, while the charging or discharging power of the battery pack remains unchanged.

[0051] During discharge, if the battery pack's State of Charge (SOC) drops to the second SOC threshold, continuing to discharge at maximum power will reduce discharge efficiency. To improve discharge efficiency, the battery pack can be controlled to charge at the minimum voltage required to meet discharge demands after the SOC drops to the second SOC threshold.

[0052] The first and second SOC thresholds are related to the performance level of the battery pack.

[0053] It is understood that this embodiment can implement corresponding charge and discharge modes in different charge and discharge stages to optimize charge and discharge efficiency and / or charge and discharge duration.

[0054] In one embodiment, the charging and discharging phase includes a first phase, a second phase, and a third phase performed sequentially in time. If the charging and discharging phase is the second phase, the charging and discharging mode of the charging and discharging strategy matched with the second phase is the power mode; if the charging and discharging phase is the first phase or the third phase, the charging and discharging mode of the charging and discharging strategy matched with the first phase or the third phase is the efficiency mode.

[0055] Optionally, the charging phase is at least a portion of the time between the start time of charging and the end time of charging. The discharging phase is at least a portion of the time between the start time of discharging and the end time of discharging. This at least a portion of the time can be divided into three consecutive phases: a first phase, a second phase, and a third phase.

[0056] For example, the first stage is the starting stage of charging, the third stage is the ending stage of charging, and the second stage is the middle stage of charging.

[0057] In one embodiment, the operating parameters also include the state of charge (SOC) of the battery pack. If the SOC is within the SOC threshold range, the charging and discharging strategy is in power mode; if the SOC is outside the SOC threshold range, the charging and discharging strategy is in efficiency mode.

[0058] In one embodiment, when the state of charge (SOC) is low or high, the corresponding charge / discharge strategy uses an efficiency mode; when the SOC is medium, the corresponding charge / discharge strategy uses a power mode. The low SOC refers to the state of charge of the battery pack within a first SOC range, the medium SOC refers to the state of charge of the battery pack within a second SOC range, and the high SOC refers to the state of charge of the battery pack within a third SOC range. The upper limit of the first SOC range is less than or equal to the lower limit of the second SOC range, and the lower limit of the third SOC range is greater than or equal to the upper limit of the second SOC range.

[0059] In some embodiments, the second charge range can be at least a portion of the range from 10% to 90%. Preferably, when the second charge range is 30% to 80%, a better switching between power mode and efficiency mode can be achieved, thereby enabling both power mode and efficiency mode to achieve their respective maximum effects. The first charge range can be a range lower than the lower limit of the second charge range, and the third charge range can be a range higher than the upper limit of the second charge range.

[0060] This allows for efficiency charging at both low and high SOC levels, improving charging and discharging efficiency. At a moderate SOC, power charging mode is used to increase charging power, accelerate charging, and shorten charging time.

[0061] The allowable charging current of the battery pack is affected by its current state of charge (SOC); the higher the SOC, the lower the charging current. Similarly, the discharge current of the battery pack is also affected by its current SOC; the higher the SOC, the higher the discharge current.

[0062] In one embodiment, the operating parameters include the temperature of the battery pack. If the temperature of the battery pack is within a preset temperature range, the charging and discharging mode of the charging and discharging strategy matching the operating parameters is the power mode; if the temperature of the battery pack is outside the preset temperature range, the charging and discharging mode of the charging and discharging strategy matching the operating parameters is the efficiency mode.

[0063] This allows for charging in efficiency mode at both high and low temperatures, improving charging and discharging efficiency. At moderate temperatures, power mode charging is used to increase charging power, accelerate charging speed, and shorten charging time.

[0064] Temperatures below the lower limit of the preset temperature range can be considered low, while temperatures above the preset temperature range can be considered high.

[0065] In some embodiments, the preset temperature range can be a range suitable for battery charging, such as a room temperature range. Specifically, it can be, but is not limited to, a temperature range between 20 degrees and 35 degrees.

[0066] The allowable charging and discharging current of a battery pack is affected by temperature; the lower and higher the temperature, the smaller the charging and discharging current. Compared to low and normal temperatures, high temperatures have the greatest impact on fast charging and discharging. Within the temperature range that the battery pack can withstand, its performance generally improves with increasing temperature. At normal temperature, the overall charging time is the shortest, followed by low temperature, while high temperature results in the longest fast charging time. This indicates that high temperature has the greatest impact on fast charging; that is, the higher the temperature, the longer the fast charging time.

[0067] It is understood that the above optional embodiments of this application provide schemes for matching charging and discharging modes based on the charging stage, the battery pack's SOC, and the battery pack's temperature. The above embodiments can be implemented individually or in combination. For example, the charging and discharging mode can be determined based on one, two, or three of the charging stage, the battery pack's SOC, and the battery pack's temperature.

[0068] In some embodiments of this application, when the charging and discharging mode is determined based on two or three of the charging stage, the SOC of the battery pack, and the temperature of the battery pack, the efficiency mode is preferred. For example, if one of the operating parameters matches the efficiency mode and the other operating parameter matches the power mode, charging is performed in efficiency mode.

[0069] In one embodiment, the operating parameters also include device parameters of one or more electrical components in the charge-discharge system, including at least one of the device's temperature, current, and voltage, which are used to determine the current range in the charge-discharge strategy.

[0070] In one embodiment, the current range includes a maximum charge / discharge current, which is determined based on the allowable charge / discharge current of one or more electrical devices.

[0071] As the maximum charge / discharge current increases, safety decreases. While power mode can increase the charge / discharge rate, efficiency mode will decrease the charge / discharge efficiency. This allows for the selection of a better charge / discharge strategy while ensuring safety.

[0072] In one embodiment, the maximum charge / discharge current is the minimum of the maximum charge / discharge current values ​​allowed by one or more electrical devices and the battery pack.

[0073] One or more electrical components include one or more of a drive motor, a motor controller, and a charger connected to the charging / discharging interface of the charging / discharging system.

[0074] The power mode charging and discharging methods include a power-priority mode; and / or, the efficiency mode charging and discharging methods include an efficiency-priority mode. In efficiency mode, the charging and discharging voltage is determined based on the battery pack temperature and the battery pack's state of charge; and / or, in power mode, the charging and discharging voltage is determined based on the battery pack's maximum supported voltage and the maximum supported charging and discharging voltage of the devices connected to the charging and discharging interface.

[0075] The minimum value among the maximum charge / discharge current values ​​includes one of the maximum charge / discharge current values ​​allowed by the charging pile, the maximum charge / discharge current values ​​allowed by the motor controller, and the maximum charge / discharge current values ​​allowed by the battery pack.

[0076] The maximum allowable charging and discharging current of the charging pile can be obtained from its parameter information. The maximum allowable charging and discharging current of the motor controller can be determined based on at least one of the following: the winding temperature, rotor temperature, and power device temperature of the drive motor. The rotor temperature can be at least one of the following: the magnet temperature of a permanent magnet synchronous motor, the temperature of the electrically excited rotor winding, and the temperature of the squirrel cage rotor of an asynchronous motor. The maximum allowable charging and discharging current of the battery pack can be determined based on at least one of the following: the current voltage of the battery pack, the state of charge of the battery pack, and the temperature of the battery pack.

[0077] It is understandable that selecting the minimum allowable charging and discharging current from multiple maximum charging and discharging current values ​​for charging and discharging control can ensure the safety and rate of charging and discharging.

[0078] In one embodiment, as shown in FIG2, the charging and discharging system includes a charging and discharging interface and a drive motor 10. If the stator winding temperature of the drive motor is greater than or equal to a first stator threshold temperature, and / or the rotor temperature of the drive motor is greater than or equal to a first rotor threshold temperature, the charging and discharging strategy includes reducing the charging and discharging voltage of the charging and discharging interface, or using a DC direct-connection charging state with a lower charging and discharging voltage for charging.

[0079] The first stator threshold temperature can be exemplarily 130°C, and the first rotor threshold temperature can be exemplarily 150°C.

[0080] In one embodiment, the charging and discharging system includes a charging and discharging interface and a drive motor. If the stator winding temperature of the drive motor is less than or equal to a second stator threshold temperature, and / or the rotor temperature of the drive motor is less than or equal to a second rotor threshold temperature, the charging and discharging strategy includes increasing the charging and discharging voltage of the charging and discharging interface.

[0081] The second stator threshold temperature can be exemplarily 100°C, and the second rotor threshold temperature can be exemplarily 110°C.

[0082] Charging efficiency is low when the voltage of the charging pack and the charging station is mismatched. For example, if the voltage of the charging pack is lower than that of the charging station, the charging power is lower. In this case, boost charging can be used to improve charging efficiency. For instance, if the charging station has a voltage and power of 180kW, the battery pack voltage is 366V~497V, and the maximum output current of the charging station is limited to 250A, the voltage required by the charging station can be increased to a maximum of 750V for boost charging, allowing the charging station to output its full power of 180kW. Compared to direct charging, this improves charging efficiency.

[0083] If the charging station has no current limit (the charging station's current can still meet the maximum power usage while charging and discharging according to the current voltage of the battery pack), then charging or discharging will be performed according to the minimum voltage at which the charging station can achieve the maximum current.

[0084] If the charging station has a current limit (charging and discharging according to the current voltage of the battery pack, the current of the charging station does not meet the maximum power usage, that is, the current has reached the maximum current limit of the charging station), then it is necessary to increase the charging or discharging voltage. By increasing the voltage, the power of the charging station can be increased under the same output current of the charging station, until the voltage is increased to the maximum power of the charging station.

[0085] When the stator winding temperature of the drive motor exceeds 130℃, and / or the rotor temperature exceeds 150℃, the manager uses real-time arbitration to select the minimum allowable voltage for charging or discharging, controlling the charging and discharging process, reducing the charging pile voltage, and even achieving DC direct-connect charging. When the stator winding temperature of the drive motor is below 100℃, and / or the rotor temperature is below 110℃, after the charging or discharging current limit is restored, the charging or discharging voltage is increased to improve the charging pile's operating power. This can mitigate problems such as demagnetization and insulation damage caused by excessive temperature rise in at least one of the stator and rotor components due to large voltage differences across the drive motor windings during charging or discharging.

[0086] In one embodiment, the charging and discharging system further includes a drive motor and a motor controller. If the maximum charging and discharging current is less than the maximum allowable current of one phase winding of the drive motor at the current temperature, the charging and discharging strategy includes increasing the carrier frequency of the motor controller and controlling one phase winding for charging and discharging.

[0087] In some embodiments of this application, this embodiment can further reduce losses and improve the charging and discharging efficiency of the system while meeting the current charging and discharging power or charging and discharging efficiency.

[0088] Specifically, current strategies for adjusting charging and discharging power or efficiency are achieved by adjusting the voltage matching of the charging and discharging interface. Affected by the battery pack's state of charge and temperature, high temperatures have the greatest impact on fast charging and discharging compared to low and normal temperatures. Within the temperature range that the battery pack can withstand, battery performance generally improves with increasing temperature. For example, the charging and discharging current is highest at room temperature (20℃~35℃), followed by low temperatures, and lowest at high temperatures.

[0089] For example, 30% to 80% of the state of charge is in the fast charging range. Even in the fast charging and discharging range, the charging and discharging current at maximum power is still limited by temperature (e.g., ultra-high temperature, ultra-low temperature -20℃). If it is less than the maximum current that a single-phase winding can withstand at the current temperature, a strategy of single-phase winding + variable carrier frequency can be switched to further improve efficiency.

[0090] The MCU combines the method of switching between single-phase and three-phase charging and discharging with the carrier frequency control algorithm, which can select single-phase charging and discharging or three-phase charging and discharging according to different charging and discharging currents to meet the requirements of charging and discharging power and charging and discharging efficiency.

[0091] When the charging and discharging current of a single-phase winding meets the requirements, the single-phase winding is selected first for charging and discharging control; when the single-phase winding does not meet the charging and discharging current requirements, the number of phases of the motor winding is increased, and the multi-phase winding of the motor is used to participate in charging and discharging to increase the charging and discharging power and shorten the charging and discharging time.

[0092] Combining single-phase winding charging and discharging of the motor with increasing the carrier frequency can ensure charging and discharging safety and system efficiency. Low-current charging and discharging systems have higher efficiency and generate less heat. When the temperatures of various components in the charging and discharging system are within safe ranges, circuits used for heat dissipation, such as oil pumps, water pumps, fans, and air conditioning cooling systems, can be shut down, further improving system efficiency.

[0093] The method combines single-phase winding charging and discharging of the drive motor with variable carrier frequency: Variable carrier frequency control is performed based on parameters such as charging and discharging power and current. A smaller charging and discharging current (charging and discharging power) and a higher carrier frequency can reduce iron losses. Increasing the carrier frequency with a small current has minimal impact on the power device losses. As the charging and discharging current (charging and discharging power) increases, reducing the carrier frequency of the bridge arm can reduce bridge arm losses, balance motor iron losses, and maintain high charging and discharging efficiency during small-current charging and discharging processes.

[0094] In summary, by adjusting the charging or discharging strategy in real time according to the battery pack's status, and flexibly switching between maximum charging / discharging power and highest charging / discharging efficiency, the charging / discharging time is shortened and the charging / discharging efficiency is improved, thereby enhancing user satisfaction.

[0095] This application embodiment also provides a charging and discharging system 100, as shown in FIG2. The charging and discharging system 100 includes a battery pack E1, a motor 10, a motor controller 20, and a charging and discharging interface. The charging and discharging system 100 is configured with a charging and discharging strategy based on the controller's instruction execution and matching operating parameters.

[0096] It is understood that since the charging and discharging system 100 provided in this application embodiment implements the above-mentioned charging and discharging control method, it is also possible to charge and discharge according to the charging and discharging strategy that matches the working parameters of the charging and discharging system by implementing the charging and discharging control method. In this way, a better charging and discharging strategy can be selected according to the working parameters under the current state, which is conducive to improving the charging and discharging efficiency and / or charging and discharging time.

[0097] The motor controller 20 may include at least one phase bridge arm. For example, the first phase bridge arm includes a first power transistor VT1 and a second power transistor VT2 connected between the buses. The connection point of the first power transistor VT1 and the second power transistor VT2 is the first node A. VD1 is the freewheeling diode of the first power transistor VT1, and VD2 is the freewheeling diode of the second power transistor VT2. The second phase bridge arm includes a third power transistor VT3 and a fourth power transistor VT4 connected between the buses. The connection point of the third power transistor VT3 and the fourth power transistor VT4 is the second node B. VD3 is the freewheeling diode of the third power transistor VT3, and VD4 is the freewheeling diode of the fourth power transistor VT4. The third phase bridge arm includes a fifth power transistor VT5 and a sixth power transistor VT6 connected between the buses. The connection point of the fifth power transistor VT5 and the sixth power transistor VT6 is the third stage C. VD5 is the freewheeling diode of the fifth power transistor VT5, and VD6 is the freewheeling diode of the sixth power transistor VT6.

[0098] The motor 10 may include at least one phase winding, such as at least one phase selected from windings A1-A4, B1-B4, and C1-C4. One end of winding A1-A4 is connected to a first node A, one end of winding B1-B4 is connected to a second node B, and one end of winding C1-C4 is connected to a third node C. The other end of winding A1 is connected to the other ends of windings B1 and C1 and is designated as a fourth node n1. The other end of winding A2 is connected to the other ends of windings B2 and C2 and is designated as a fifth node n2. The other end of winding A3 is connected to the other ends of windings B3 and C3 and is designated as a sixth node n3. The other end of winding A4 is connected to the other ends of windings B4 and C4 and is designated as a seventh node n4. The fourth node n1 is connected to the fifth node n2, the sixth node n3, and the seventh node n4 and is designated as an eighth node N. The (drive) motor can be a DC motor or an AC motor.

[0099] The eighth node N is connected to the positive terminal of battery pack E1 via the fifth switch K5. Bus capacitor C1 is connected between the busbars and has a voltage Udc. One end of the charging / discharging interface is connected to the busbar via the fourth switch K4. The busbar is connected to the positive terminal of battery pack E1 via the second switch K2, and the busbar is also connected to the positive terminal of battery pack E1 via switch K0 and resistor R. The charging / discharging interface can be a DC charging / discharging interface or an AC charging / discharging interface.

[0100] The other end of the charging / discharging interface is connected to the negative terminal of the battery pack E1 via the third switch K3 and the first switch K1.

[0101] The above-mentioned boost charging scheme is as follows: close the first switch K1, the third switch K3, the fourth switch K4 and the fifth switch K5. One end of the charging and discharging interface is connected to the positive terminal of the battery pack E1 via the fourth switch, one of the upper bridge arms (VT1, VT3, VT5), at least one phase winding and the fifth switch K5. The other end of the charging and discharging interface is connected to the negative terminal of the battery pack E1 via the closed first switch K1 and the third switch K3, thereby realizing boost charging.

[0102] The charging and discharging system shown in Figure 2 can utilize motor 10 and motor controller 20 for voltage conversion. For example, motor 10 and motor controller 20 can be used to boost the voltage of the battery for external discharge, or motor 10 and motor controller 20 can be used to buck the voltage of the charging pile at the charging and discharging port for charging, or motor 10 and motor controller 20 can be used to boost the current of the charging pile at the charging and discharging interface for charging the battery pack.

[0103] The charging and discharging system shown in Figure 2 is an example, and the embodiments of this application are not limited to the charging and discharging system shown in Figure 2.

[0104] In some embodiments of this application, the N line of the motor 10 can be led out to the positive or negative terminal of the charging / discharging port, which can realize the boost charging of the battery using the motor and motor controller, or the de-voltage discharge of the battery pack using the motor and motor controller.

[0105] This application embodiment also provides a controller 200, as shown in FIG3. The controller 200 includes a processor 210, which is connected to a memory. The memory is used to store computer programs, and the processor 210 is used to execute the computer programs to implement the above-mentioned charging and discharging control method.

[0106] It is understood that since the controller 200 provided in this application embodiment implements the above-mentioned charging and discharging control method, it can also implement the charging and discharging control method on the charging and discharging system, and charge and discharge according to the charging and discharging strategy that matches the working parameters of the charging and discharging system. Thus, a better charging and discharging strategy can be selected according to the working parameters under the current state, which is conducive to improving the charging and discharging efficiency and / or charging and discharging time.

[0107] This application embodiment also provides a vehicle 300, as shown in FIG4, which includes the aforementioned charging and discharging system 100 or controller 200. It is understood that, since the vehicle 300 provided in this application embodiment includes the aforementioned charging and discharging system 100 or controller 200, it is also possible to implement a charging and discharging control method on the charging and discharging system, and to perform charging and discharging according to a charging and discharging strategy matched with the operating parameters of the charging and discharging system. This allows for the selection of a more optimal charging and discharging strategy based on the operating parameters under the current state, thereby improving charging and discharging efficiency and / or charging and discharging time.

[0108] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0109] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0110] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0111] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A charging and discharging control method, characterized in that, The charge-discharge control method is applied to a charge-discharge system, and the charge-discharge control method includes: Obtain the operating parameters of the charging and discharging system, the operating parameters including at least one of the state of charge of the battery pack of the charging and discharging system, the temperature of the battery pack, and the charging and discharging stage of the charging and discharging system; Charge and discharge according to a charge and discharge strategy that matches the operating parameters.

2. The method according to claim 1, characterized in that, The charging and discharging strategy includes a charging and discharging mode, which includes at least one of a power mode and an efficiency mode. The operating parameters include the charging and discharging phases. The charging and discharging strategy matching the operating parameters includes a charging and discharging mode that matches the charging and discharging phases of the operating parameters.

3. The method according to claim 2, characterized in that, The charging and discharging phase includes a first phase, a second phase, and a third phase performed sequentially in time. If the charging and discharging phase is the second phase, the charging and discharging mode of the charging and discharging strategy matched with the second phase is the power mode; if the charging and discharging phase is the first phase or the third phase, the charging and discharging mode of the charging and discharging strategy matched with the first phase or the third phase is the efficiency mode.

4. The charging and discharging control method according to claim 3, characterized in that, The first stage is the starting stage of charging, the third stage is the ending stage of charging, and the second stage is the intermediate stage of charging.

5. The method according to claim 2, characterized in that, The operating parameters also include the state of charge of the battery pack. When the state of charge is low or high, the corresponding charging and discharging strategy's charging and discharging mode is the efficiency mode. When the state of charge is medium, the corresponding charging and discharging strategy's charging and discharging mode is the power mode. The low charge state is the state of the battery pack when its state of charge value is within a first charge range; the medium charge state is the state of the battery pack when its state of charge value is within a second charge range; and the high charge state is the state of the battery pack when its state of charge value is within a third charge range. The upper limit of the first charge range is less than or equal to the lower limit of the second charge range, and the lower limit of the third charge range is greater than or equal to the upper limit of the second charge range.

6. The method according to claim 2, characterized in that, The operating parameters include the temperature of the battery pack. If the temperature of the battery pack is within a preset temperature range, the charging and discharging mode of the charging and discharging strategy that matches the operating parameters is the power mode. If the temperature of the battery pack is outside the preset temperature range, the charging and discharging mode of the charging and discharging strategy that matches the operating parameters is the efficiency mode.

7. The method according to any one of claims 1-6, characterized in that, The operating parameters also include the electrical device parameters of one or more electrical devices in the charging and discharging system. The electrical device parameters include at least one of the temperature, current, and voltage of the electrical device, and the electrical device parameters are used to determine the current range in the charging and discharging strategy.

8. The method according to claim 7, characterized in that, The current range includes the maximum charge / discharge current, which is determined based on the allowable charge / discharge current of the one or more electrical devices.

9. The method according to claim 8, characterized in that, The maximum charge / discharge current is the minimum value among the maximum allowable charge / discharge current values ​​of the one or more electrical devices and the battery pack.

10. The method according to claim 9, characterized in that, The one or more electrical devices include one or more of a drive motor, a motor controller, and a charger connected to the charging and discharging interface of the charging and discharging system.

11. The method according to any one of claims 2-6, characterized in that, The power mode charging and discharging method includes a mode that prioritizes charging and discharging power; and / or, The charging and discharging methods of the efficiency mode include a mode that prioritizes charging and discharging efficiency.

12. The method according to any one of claims 2-6, characterized in that, In the efficiency mode, the charge / discharge voltage is determined based on the temperature of the battery pack, the state of charge of the battery pack, and / or, In the power mode, the charging and discharging voltage is determined based on the maximum voltage supported by the battery pack and the maximum charging and discharging voltage supported by the devices connected to the charging and discharging interface.

13. The method according to any one of claims 1-6, characterized in that, The charging and discharging system includes a charging and discharging interface and a drive motor. If the stator winding temperature of the drive motor is greater than or equal to a first stator threshold temperature, and / or the rotor temperature of the drive motor is greater than or equal to a first rotor threshold temperature, the charging and discharging strategy includes reducing the charging and discharging voltage of the charging and discharging interface.

14. The method according to any one of claims 2-6, characterized in that, The charging and discharging system includes a charging and discharging interface and a drive motor. If the stator winding temperature of the drive motor is less than or equal to a second stator threshold temperature, and / or the rotor temperature of the drive motor is less than or equal to a second rotor threshold temperature, the charging and discharging strategy includes increasing the charging and discharging voltage of the charging and discharging interface.

15. The method according to claim 8, characterized in that, The charging and discharging system also includes a drive motor and a motor controller. If the maximum charging and discharging current is less than the maximum allowable current of one phase winding of the drive motor at the current temperature, the charging and discharging strategy includes increasing the carrier frequency of the motor controller and controlling one phase winding to charge and discharge.

16. The method according to claim 15, characterized in that, The relationship between the maximum charging / discharging current and the carrier frequency is an inverse relationship.

17. The method according to claim 13, characterized in that, The charging and discharging system includes electrical components and a heat dissipation subsystem for dissipating heat from the electrical components. When the temperature of the electrical components is within a threshold range, the heat dissipation subsystem is in a closed state.

18. The method according to claim 8, characterized in that, The charging and discharging system also includes a drive motor and a motor controller. When the maximum charging and discharging current is greater than the maximum allowable current of one phase winding of the drive motor at the current temperature, the charging and discharging strategy includes controlling the multi-phase windings of the drive motor to charge and discharge.

19. A controller, characterized in that, The controller includes a processor connected to a memory for storing a computer program, and the processor for executing the computer program to implement the charge / discharge control method as described in any one of claims 1-18.

20. A charging and discharging system, characterized in that, The system includes a battery, a motor, a motor controller, and a charging / discharging interface. The charging / discharging system is configured to connect to the controller as described in claim 19 to execute a charging / discharging strategy that matches the operating parameters of the charging / discharging system based on the controller's control commands.

21. A vehicle, characterized in that, The vehicle includes the controller as claimed in claim 19, and / or the vehicle includes the charging and discharging system as claimed in claim 20.

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