Hybrid battery-powered control method, system, readable storage medium and electric vehicle

Abstract

The application relates to the field of new energy automobile control, and particularly discloses a hybrid battery power supply control method and system, a readable storage medium and a pure electric vehicle, the method is applied to a hybrid battery of a pure electric vehicle, and the method comprises the following steps: a VCU analyzes a required torque T, judges whether the vehicle is in driving or energy recovery; an MCU responds to the required torque T and controls a motor to perform power output or energy recovery; the MCU collects motor speed r and sends the motor speed r to the VCU, the VCU estimates driving power or energy recovery power P through the torque T and the speed r; a lithium battery BMS1 and a super capacitor BMS2 feed back information to the VCU, and the VCU controls the charging and discharging logic of the lithium battery and the super capacitor during driving or energy recovery; the application solves the problems that the charging and discharging performance of a pure electric vehicle with a lithium battery as an energy storage mechanism is limited at low temperature and low power, and the energy density of a super capacitor battery is low, and simultaneously improves the safety and stability of the hybrid battery.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle control, and particularly to hybrid battery power supply control methods, systems, readable storage media, and electric vehicles. Background Technology

[0002] With the development and popularization of pure electric vehicles, electric vehicle power battery technology has also developed rapidly. Currently, electric vehicles are mainly upgraded in two directions: driving range and acceleration performance.

[0003] Lithium-ion batteries are a type of rechargeable battery. Compared to other types of batteries, they have advantages such as high energy density, good safety performance, and long cycle life. Therefore, most pure electric vehicles currently use lithium-ion batteries. However, lithium-ion batteries also have some significant disadvantages. First, lithium-ion batteries have poor low-temperature charging and discharging performance. This causes a significant decrease in vehicle acceleration performance in cold environments due to reduced discharge capacity. Currently, electric vehicles are generally equipped with energy recovery systems that can convert the kinetic energy generated during driving into electrical energy to recharge the battery and extend the driving range. However, when the battery temperature is low, the charging capacity decreases, and the energy recovery system cannot recharge the battery pack with the recovered electrical energy.

[0004] To address this issue, some electric vehicles using lithium-ion batteries in the current technology are equipped with battery pack heating functions. The battery pack uses its own electrical energy to heat it through a heating film or a water circulation heating system. Although this can partially improve the low-temperature performance of the battery pack, a large amount of electrical energy is also lost during the heating process, thus affecting the driving range.

[0005] Secondly, due to the low discharge rate of lithium-ion batteries, with the significant improvement in the acceleration performance of electric vehicles today, the discharge power of some lithium battery packs can no longer meet the driving power of the electric drive system. This situation is more obvious when the remaining charge of the lithium battery is low or the battery temperature is low. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a hybrid battery-powered control method, system, readable storage medium, and electric vehicle.

[0007] According to a first aspect of the present invention, a hybrid battery power supply control method is applied to a hybrid battery system of a pure electric vehicle, the method comprising the following steps:

[0008] Step S100: Build a hybrid battery power supply control architecture, which includes: vehicle controller, motor controller, battery management system, communication bus, lithium battery and supercapacitor.

[0009] Step S200: The vehicle control unit (VCU) analyzes the driver's required torque T and determines whether the vehicle is in driving mode or energy recovery mode.

[0010] Step S300: The required torque T is sent to the motor control unit (MCU). The motor control unit responds to the required torque T and controls the motor to output power or recover energy.

[0011] Step S400: The motor controller collects the motor speed r and sends it to the vehicle controller. The vehicle controller estimates the drive power or energy recovery power based on the torque T and the speed r.

[0012] Step S500: The first battery management system (BMS1) of the lithium battery and the second battery management system (BMS2) of the supercapacitor calculate the remaining capacity (State of Charge, SOC), maximum charging power and maximum discharging power of the corresponding battery pack, and feed the calculated information back to the vehicle controller through the communication bus (Controller Area Network, CAN). The vehicle controller processes the feedback information.

[0013] Step S600: The vehicle controller (VCU) controls the charging and discharging logic of the lithium battery and supercapacitor during driving or energy recovery based on the processing results;

[0014] Step S700: Jump to S200 according to the set calculation cycle and repeat the above calculation process.

[0015] According to an embodiment of the present invention, a hybrid battery power supply control method calculates the remaining SOC, maximum charging power, and maximum discharging power of the battery using the BMS1 of the lithium battery and the BMS2 of the supercapacitor, respectively, and feeds this information back to the VCU. The VCU compares this information with the estimated driving power or energy recovery power P. In driving mode, the VCU controls the lithium battery or supercapacitor to supply power to the MCU based on the calculation results. In energy recovery mode, the VCU controls the MCU to charge the recovered energy into the lithium battery or supercapacitor based on the calculation results. In high and low temperature conditions or low battery conditions, the VCU can also control the DC-DC converter to charge the supercapacitor from the lithium battery. This overcomes the disadvantages of poor high and low temperature performance of existing lithium-ion batteries and low energy density of supercapacitor batteries. It solves the problem of limited charging and discharging performance of pure electric vehicles using lithium-ion batteries as energy storage mechanisms at low temperatures and low battery levels. At the same time, by setting different input and output power when the lithium battery charges the supercapacitor under different conditions, the stability and safety of the hybrid battery are ensured.

[0016] According to some embodiments of the present invention, in step S200, if the vehicle controller determines that the vehicle is in a driving state, step S500 includes the following steps:

[0017] Step S510: BMS1 determines the maximum discharge power P1 of the lithium battery and sends the maximum discharge power P1 to the vehicle controller; the vehicle controller determines the magnitude of the drive power P and the maximum discharge power P1. When the drive power P > the maximum discharge power P1, the supercapacitor battery system supplies power to the motor controller.

[0018] Step S511: When the driving power P ≤ the maximum discharge power P1, the first battery management system collects the remaining capacity S1 of the lithium-ion battery pack, and the second battery management system collects the remaining capacity S2 of the supercapacitor battery pack. The remaining capacity S1 and S2 are then sent to the vehicle controller. The vehicle controller compares the remaining capacity S1 and S2. When the remaining capacity S1 > the remaining capacity S2, the lithium battery powers the MCU. When the remaining capacity S1 ≤ the remaining capacity S2, the supercapacitor powers the MCU.

[0019] According to some embodiments of the present invention, in step S200, if the vehicle controller determines that the vehicle is in an energy recovery state, step S500 includes the following steps:

[0020] Step S520: The first battery management system determines the maximum discharge power P1 and the maximum charging power P3 of the lithium battery; and sends the maximum discharge power P1, the maximum charging power P3 and the remaining capacity S1 of the battery pack to the vehicle controller; the vehicle controller compares the energy recovery power P with the maximum charging power P3. When the energy recovery power P > the maximum charging power P3, the vehicle controller control circuit enables the electrical energy to be charged into the supercapacitor battery.

[0021] Step S521: When it is determined that the energy recovery power P ≤ the maximum charging power P3, the second battery management system collects the remaining battery pack capacity S2 and the maximum charging power P2 of the supercapacitor battery; and sends the remaining battery pack capacity S2 and the maximum charging power P2 to the vehicle controller. The vehicle controller compares the remaining battery pack capacity S1 and the remaining battery pack capacity S2. If the remaining battery pack capacity S1 > the remaining battery pack capacity S2, the recovered energy is charged into the supercapacitor battery. If the remaining battery pack capacity S1 ≤ the remaining battery pack capacity S2, the recovered energy is charged into the lithium battery.

[0022] According to some embodiments of the present invention, step S600 specifically includes: the second battery management system determines the maximum charging power P2 of the supercapacitor and sends the maximum charging power P2 to the vehicle controller; the vehicle controller compares the remaining capacity S2 of the battery pack with the calibration value M (minimum initial charging capacity); when the remaining capacity S2 of the battery pack > the calibration value M, the lithium battery does not charge the supercapacitor; when the remaining capacity S2 of the battery pack ≤ the calibration value M, the vehicle controller controls the DC high-voltage to low-voltage inverter (DCDC) to charge the supercapacitor battery through the DC high-voltage to low-voltage inverter. The setting of the DC high-voltage to low-voltage inverter ensures the continuous power supply of the supercapacitor battery.

[0023] According to some embodiments of the present invention, when the vehicle is in driving mode, and the remaining capacity of the battery pack S2 ≤ the rated value M and the lithium battery is supplying power to the motor controller, the DC high-voltage to low-voltage inverter controls the input power of the lithium battery to be lower than the maximum discharge power P1 - drive power P, and the output power to the supercapacitor battery to be lower than the maximum charging power P2. When the remaining capacity of the battery pack S2 ≤ the rated value M and the supercapacitor battery is supplying power to the MCU, the DC-DC converter controls the input power of the lithium battery to be lower than the maximum discharge power P1, and the output power to the supercapacitor battery to be lower than the maximum charging power P2 + drive power P. By controlling the charging and discharging power between the lithium battery and the supercapacitor under different conditions, the hybrid battery is protected while ensuring normal battery power supply, making it safer and more reliable.

[0024] According to some embodiments of the present invention, if the vehicle is in an energy recovery state, when the remaining capacity of the battery pack S2 ≤ the calibrated value M, the DC-DC control lithium battery input power is lower than the maximum discharge power P1, and the output power to the supercapacitor battery is lower than the maximum charging power P2 - drive power P.

[0025] According to some embodiments of the present invention, in step S100, when the required torque T≥0, the vehicle is in a driving state, and the battery outputs electrical energy to the MCU to drive the motor, and the battery is in a discharging state; when the required torque T<0, the vehicle is in an energy recovery state, and the motor converts mechanical energy into electrical energy and charges the battery through the MCU, and the battery is in a charging state.

[0026] According to some embodiments of the present invention, in step S200, when the required torque T≥0, the battery outputs electrical energy to the MCU to drive the motor, and the battery is in a discharging state; when the required torque T<0, the motor converts mechanical energy into electrical energy and charges the battery through the MCU, and the battery is in a charging state.

[0027] According to some embodiments of the present invention, in step S300, the vehicle controller (VCU) estimates the drive power or energy recovery power P according to the formula P = r * T * 9550, where P is the power during drive or energy recovery, r is the motor speed, and T is the required torque.

[0028] According to some embodiments of the present invention, a hybrid battery power supply control system is provided for use in a pure electric vehicle, the system comprising:

[0029] First state acquisition module: used to acquire the current state of the pure electric vehicle;

[0030] Second state acquisition module: used to acquire the current state of the hybrid battery;

[0031] Condition judgment module: used to determine whether the hybrid battery is currently in power supply mode or energy recovery mode;

[0032] Control module: used to control the hybrid battery to supply power to the motor controller or the motor controller to recover electrical energy to the hybrid battery, as well as the charging and discharging process between the hybrid batteries;

[0033] Execution module: Used to execute instructions issued by the control module.

[0034] According to a second aspect of the present invention, a readable storage medium includes one or more programs stored in the readable storage medium, which, when executed by a processor, implement a hybrid battery control method for a pure electric vehicle.

[0035] According to a third aspect of the present invention, a pure electric vehicle includes a memory and a processor, wherein:

[0036] Memory: Used to store computer programs;

[0037] Processor: When executing a computer program stored in memory, implements the hybrid battery control method as described in any one of claims 1-8.

[0038] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1This is a flowchart of a hybrid battery power supply control method according to an embodiment of the present invention;

[0041] Figure 2 This is a logic judgment diagram of the driving state and energy recovery state according to an embodiment of the present invention;

[0042] Figure 3 This is a diagram showing the interaction relationships of various components in a hybrid battery power supply control method according to an embodiment of the present invention.

[0043] Figure 4 This is a detailed flowchart of step S500 in the driving state or energy recovery state according to an embodiment of the present invention;

[0044] Figure 5 This is a VCU control logic diagram of the drive state according to an embodiment of the present invention;

[0045] Figure 6 This is a VCU control logic diagram for the energy recovery state according to an embodiment of the present invention;

[0046] Figure 7 This is a diagram showing the hardware connections according to an embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of a hybrid battery-powered control system according to an embodiment of the present invention; Detailed Implementation

[0048] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0049] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0051] The terms "first," "second," "third," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, it may include a series of steps or units, or optionally, steps or units not listed, or other steps or units inherent to these processes, methods, products, or devices.

[0052] The accompanying drawings show only the portions relevant to this application, not all of them. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts depict operations (or steps) as sequential processes, many of these operations may be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operation is completed, but may also have additional steps not included in the drawings. The process may correspond to a method, function, procedure, subroutine, subprogram, etc.

[0053] The terms “component,” “module,” “system,” “unit,” etc., used in this specification are used to refer to computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. For example, a unit can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, a thread of execution, a program, and / or distributed between two or more computers. Furthermore, these units can be executed from various computer-readable media on which various data structures are stored. Units can communicate, for example, via local and / or remote processes based on signals having one or more data packets (e.g., data from a second unit interacting with another unit between a local system, a distributed system, and / or a network; for example, the Internet interacting with other systems via signals).

[0054] Example 1

[0055] Please see Figures 1 to 4 This embodiment provides a hybrid battery power supply control method, which includes the following steps:

[0056] Step S100: Build a hybrid battery power supply control architecture, which includes: vehicle controller, motor controller, battery management system, communication bus, lithium battery and supercapacitor.

[0057] Step S200: The Vehicle Control Unit (VCU) analyzes the driver's required torque T and determines whether the vehicle is in driving mode or energy recovery mode.

[0058] Step S300: The required torque T is sent to the motor control unit (MCU). The motor control unit responds to the required torque T and controls the motor to output power or recover energy.

[0059] Step S400: The motor controller collects the motor speed r and sends it to the vehicle controller. The vehicle controller estimates the drive power or energy recovery power based on the torque T and the speed r.

[0060] Step S500: The first battery management system (BMS1) of the lithium battery and the second battery management system (BMS2) of the supercapacitor calculate the remaining capacity (State of Charge, SOC), maximum charging power and maximum discharging power of the corresponding battery pack, and feed the calculated information back to the vehicle controller through the communication bus (Controller Area Network, CAN). The vehicle controller processes the feedback information.

[0061] Step S600: The vehicle controller controls the charging and discharging logic of the lithium battery and supercapacitor during driving or energy recovery based on the processing results;

[0062] Step S700: Jump to S200 according to the set calculation cycle and repeat the above calculation process.

[0063] Specifically, in step S200, when the required torque T≥0, the vehicle is in a driving state, and when the required torque T<0, the vehicle is in an energy recovery state.

[0064] Specifically, in step S300, when the required torque T≥0, the battery outputs electrical energy to the MCU to drive the motor, and the battery is in a discharging state; when the required torque T<0, the motor converts mechanical energy into electrical energy and charges the battery through the MCU, and the battery is in a charging state.

[0065] Specifically, in step S400, the VCU estimates the drive power or energy recovery power P according to the formula P = r * T * 9550, where P is the power during drive or energy recovery, r is the motor speed, and T is the required torque.

[0066] Example 2

[0067] Please see Figure 5 and Figure 7 This embodiment further describes the detailed process of the hybrid battery power supply control method provided in Embodiment 1 when the vehicle is in a driving state, including the following steps:

[0068] S1: First, the VCU analyzes the driver's required torque T by the accelerator and brake pedal opening, vehicle speed, etc., and sends the required torque to the MCU. The MCU responds to the required torque and controls the motor to output power. At the same time, the MCU collects the motor speed r and sends it to the VCU to proceed to the next step.

[0069] S2: The VCU estimates the drive power P based on the required torque T and the motor speed r using the formula: P = r * T * 9550, and then proceeds to the next step.

[0070] S3: The battery management system BMS1 of the lithium-ion battery determines the maximum discharge power PA of the battery based on factors such as battery temperature and remaining SOC and sends it to VCU. VCU compares the magnitude of P and PA. When it is determined that P>PA, the lithium-ion battery cannot meet the power demand of the motor. At this time, VCU controls the closing of high-voltage relay 2 and the opening of high-voltage relay 1 through the low-voltage circuit, and the supercapacitor battery system supplies power to MCU. When it is determined that P≤PA, proceed to the next step.

[0071] S4: BMS1 and BMS2 collect the SOC S1 and S2 of the lithium-ion battery and the supercapacitor battery respectively, and send them to VCU. VCU compares the magnitudes of S1 and S2. If it is determined that S1>S2, the power in the lithium-ion battery is used first. VCU disconnects high-voltage relay 2 and closes high-voltage relay 1. At this time, the lithium-ion battery supplies power to the MCU. If it is determined that S1≤S2, the power in the supercapacitor battery is used first. VCU disconnects high-voltage relay 1 and closes high-voltage relay 2. At this time, the supercapacitor battery supplies power to the MCU, and proceeds to the next step.

[0072] S5: The Battery Management System (BMS2) of the supercapacitor battery determines the maximum charging power PB of the battery pack based on factors such as battery temperature and remaining SOC. It then sends the remaining SOC and maximum charging power PB to the Vehicle Control Unit (VCU). The VCU stops charging when the SOC of the supercapacitor battery system is higher than the calibrated value M. When the SOC is lower than the calibrated value M, it controls the current and voltage output of the DC-DC converter to charge the supercapacitor battery from the lithium-ion battery. At this time, the high-voltage port of the DC-DC converter connected to the lithium-ion battery is the input terminal, and the port connected to the supercapacitor battery is the output terminal. If high-voltage relay 1 is closed and high-voltage relay 2 is open, the input power is controlled to be lower than PA-P, and the output power is lower than PB. If high-voltage relay 1 is open and high-voltage relay 2 is closed, the input power is controlled to be lower than PA, and the output power is lower than PB+P, then the process ends. In the formula, M is the calibrated value, representing the minimum initial charging capacity of the supercapacitor battery system, typically calibrated to 20% of the remaining capacity, but this can be adjusted according to the battery's physical characteristics and the vehicle's requirements.

[0073] S6: Jump to the start state and repeat the above calculation process. The calculation cycle is above 50Hz to ensure that the system can quickly respond to the impact of real-time power demand changes.

[0074] Example 3

[0075] Please see Figure 6 and Figure 7 This embodiment further describes the detailed process of the hybrid battery power supply control method provided in Embodiment 1 when the vehicle is in an energy recovery state, including the following steps:

[0076] S11: First, the VCU analyzes the driver's required torque T by the accelerator and brake pedal opening, vehicle speed, etc., and sends the required torque to the MCU. The MCU responds to the required torque and controls the motor to perform energy recovery. At the same time, the MCU collects the motor speed r and sends it to the VCU to proceed to the next step.

[0077] S22: The VCU estimates the drive power P based on the required torque T and the motor speed r using the formula: P=r*T*9550, and then proceeds to the next step.

[0078] S33: The battery management system (BMS1) of the lithium-ion battery calculates the remaining SOC (State of Charge) S1 based on the total charge and the used charge. It also determines the maximum charging power (PC) and maximum discharging power (PA) of the battery based on factors such as battery temperature and remaining SOC, and sends these three values ​​to the VCU. The VCU compares the values ​​of P and PC. When it is determined that P > PC, there is a risk of overcharging of the lithium-ion battery. At this time, the VCU controls the closing of the high-voltage relay 2 and the opening of the high-voltage relay 1 through the low-voltage circuit. The MCU charges the supercapacitor battery system with the electrical energy obtained from energy recovery. When it is determined that P ≤ PC, the next step is performed.

[0079] S44: The battery management system (BMS2) of the supercapacitor battery calculates the remaining SOC (S2) based on the total charge and the used charge, and determines the maximum charging power (PB) of the battery pack based on factors such as battery temperature and remaining SOC. These two values ​​are then sent to the VCU. The VCU determines the relative values ​​of S1 and S2. When S1 > S2, the lithium-ion battery has sufficient charge. In this case, the VCU closes high-voltage relay 2 and opens high-voltage relay 1, allowing the recovered energy to charge the supercapacitor battery, and proceeds to the next step. When S1 ≤ S2, the supercapacitor battery has sufficient charge. In this case, the VCU closes high-voltage relay 1 and opens high-voltage relay 2, allowing the recovered energy to charge the lithium-ion battery, and the process ends.

[0080] S55: The VCU determines whether the supercapacitor battery system's SOC (State of Charge) is above the calibrated value M. When the SOC is below the calibrated value M, it controls the current and voltage output of the DC-DC converter to charge the supercapacitor battery from the lithium-ion battery. At this time, the high-voltage port of the DC-DC converter connected to the lithium-ion battery is the input terminal, and the port connected to the supercapacitor battery is the output terminal. The system terminates when the input power is below PA and the output power is below PB-P. In the formula, M is the calibrated value, representing the minimum initial charging capacity of the supercapacitor battery system. It is generally calibrated to 20% of the remaining capacity, but can be calibrated according to the battery's physical characteristics and the vehicle's requirements.

[0081] S66: Jump to the start state and repeat the above calculation process. The calculation cycle is above 50Hz to ensure a rapid response to the impact of real-time power demand changes on the system.

[0082] Example 4

[0083] Please see Figure 7 This embodiment illustrates the hardware connection relationships and working principle of a hybrid battery power supply control method, including:

[0084] The motor is connected to the wheels via a transmission system, which includes a reducer, differential, and half-shafts. The motor controller controls the motor, connected via high-voltage and low-voltage control lines. The lithium-ion battery system and supercapacitor battery system are connected to the MCU via high-voltage lines, supplying power to the MCU. Two high-voltage relays control the on / off state of the two high-voltage circuits from the lithium-ion battery system to the MCU and from the supercapacitor battery system to the MCU, respectively. These two relays are connected to the VCU via a low-voltage control circuit, and their on / off state is controlled by the VCU. The lithium-ion battery and supercapacitor are connected to the DC-DC converter via high-voltage lines. BMS1 is the battery management system for the lithium-ion battery, responsible for managing and protecting the lithium-ion battery system; BMS2 is the battery management system for the supercapacitor, responsible for managing and protecting the supercapacitor battery system. The MCU, BMS1, BMS2, and DC-DC converter are connected to the VCU via low-voltage control circuits and interact via CAN signals.

[0085] The VCU determines whether the vehicle is in acceleration or energy recovery mode by judging whether the torque demanded by the driver is positive or negative, and controls the on / off state of two high-voltage relays and the voltage and current of the DC-DC input and output according to different states.

[0086] Example 5

[0087] Please see Figure 8 The hybrid battery power supply control system proposed in the fourth embodiment of the present invention is applied to pure electric vehicles, and the system includes:

[0088] First state acquisition module: used to acquire the current state of the pure electric vehicle;

[0089] Second state acquisition module: used to acquire the current state of the hybrid battery;

[0090] Condition judgment module: used to determine whether the hybrid battery is currently in power supply mode or energy recovery mode;

[0091] Control module: used to control the hybrid battery to supply power to the motor controller or the motor controller to recover electrical energy to the hybrid battery, as well as the charging and discharging process between the hybrid batteries;

[0092] Execution module: Used to execute instructions issued by the control module.

[0093] Example 6

[0094] Based on the above embodiments, this embodiment provides a hybrid battery power supply control method that can be applied not only to lithium-ion battery and supercapacitor battery systems, but also to battery systems with the same or similar performance characteristics. The lithium-ion battery can be replaced by nickel-metal hydride battery, sodium-ion battery or other batteries with similar performance characteristics, and the supercapacitor battery can be replaced by ordinary capacitor, high-power lithium-ion battery or other batteries with similar performance characteristics.

[0095] Example 7

[0096] In another aspect, the present invention provides a readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in any one of embodiments 1 to 4 above.

[0097] Example 8

[0098] In another aspect, the present invention provides a pure electric vehicle, the pure electric vehicle including a memory and a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program stored in the memory to implement the method and steps described in any one of embodiments 1 to 4 above.

[0099] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0100] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0101] Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The reference to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily indicate the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0102] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A hybrid battery power supply control method, characterized in that, Includes the following steps: Step S100: Build a hybrid battery power supply control architecture, which includes: vehicle controller, motor controller, battery management system, DC high voltage to low voltage inverter, lithium battery and supercapacitor; Step S200: The vehicle controller analyzes the required torque T and determines whether the vehicle is in driving mode or energy recovery mode. Step S300: The required torque T is sent to the motor controller, and the motor controller responds to the required torque T and controls the motor to output power or recover energy; Step S400: The motor controller collects the motor speed r and sends it to the vehicle controller. The vehicle controller estimates the drive power or energy recovery power based on the torque T and the motor speed r. Step S500: The first battery management system of the lithium battery and the second battery management system of the supercapacitor respectively calculate the remaining capacity, maximum charging power and maximum discharging power of the corresponding battery pack, and feed the calculated information back to the vehicle controller. The vehicle controller processes the feedback information. Step S600: The vehicle controller controls the charging and discharging logic of the lithium battery and supercapacitor based on the processing results; Step S700: Jump to S200 according to the set calculation cycle to start the calculation process again; In step S200, if the vehicle controller determines that the vehicle is in a driving state, step S500 includes the following steps: Step S510: The first battery management system determines the maximum discharge power of the lithium battery and sends the maximum discharge power to the vehicle controller; the vehicle controller determines the magnitude of the drive power and the maximum discharge power. When the drive power > the maximum discharge power, the supercapacitor system supplies power to the motor controller. Step S511: When the driving power is less than or equal to the maximum discharge power, the first battery management system collects the remaining capacity S1 of the lithium battery pack and the second battery management system collects the remaining capacity S2 of the supercapacitor battery pack, and sends the remaining capacity S1 and S2 to the vehicle controller. When the remaining capacity S1 is greater than the remaining capacity S2, the lithium battery supplies power to the motor controller. When the remaining capacity S1 is less than or equal to the remaining capacity S2, the supercapacitor supplies power to the motor controller.

2. The hybrid battery power supply control method according to claim 1, characterized in that, In step S200, if the vehicle controller determines that the vehicle is in an energy recovery state, step S500 includes the following steps: Step S520: The first battery management system determines the maximum discharge power P1 of the lithium battery, the maximum charging power P3 of the lithium battery, and the remaining capacity S1 of the battery pack and sends them to the vehicle controller; the vehicle controller compares the energy recovery power with the maximum charging power P3 of the lithium battery. When the energy recovery power > the maximum charging power P3 of the lithium battery, the vehicle controller control circuit enables the electrical energy to be charged into the supercapacitor battery. Step S521: When the energy recovery power is determined to be ≤ the maximum charging power P3 of the lithium battery, the second battery management system collects the remaining battery pack capacity S2 and the maximum charging power P2 of the supercapacitor battery; and feeds it back to the vehicle controller. The vehicle controller compares the remaining battery pack capacity S1 and the remaining battery pack capacity S2. When the remaining battery pack capacity S1 > the remaining battery pack capacity S2, the recovered energy is charged into the supercapacitor battery. When the remaining battery pack capacity S1 ≤ the remaining battery pack capacity S2, the recovered energy is charged into the lithium battery.

3. The hybrid battery power supply control method according to claim 1, characterized in that, Step S600 specifically includes: The second battery management system determines the maximum charging power P2 of the supercapacitor and sends it to the vehicle controller. The vehicle controller compares the remaining capacity S2 of the battery pack with the calibration value M, which is the minimum initial charging capacity. When the remaining capacity S2 of the battery pack is greater than the calibration value M, the lithium battery does not charge the supercapacitor. When the remaining capacity S2 of the battery pack is less than or equal to the calibration value M, the vehicle controller controls the DC high-voltage to low-voltage inverter to charge the lithium battery to the supercapacitor.

4. The hybrid battery power supply control method according to claim 3, characterized in that, When the vehicle is in driving mode, and the remaining battery pack capacity S2 ≤ calibrated value M and the lithium battery is supplying power to the motor controller, the DC high-voltage to low-voltage inverter controls the lithium battery input power to be lower than the maximum discharge power P1 - drive power, and the output power to the supercapacitor battery is lower than the supercapacitor's maximum charging power P2. When the remaining battery pack capacity S2 ≤ calibrated value M and the supercapacitor battery is supplying power to the motor controller, the DC high-voltage to low-voltage inverter controls the lithium battery input power to be lower than the maximum discharge power P1, and the output power to the supercapacitor battery is lower than the supercapacitor's maximum charging power P2 + drive power.

5. The hybrid battery power supply control method according to claim 3, characterized in that, If the vehicle is in energy recovery mode, when the remaining capacity of the battery pack S2 ≤ the rated value M, the DC high-voltage to low-voltage inverter controls the lithium battery input power to be lower than the maximum discharge power P1, and the output power to the supercapacitor battery is lower than the supercapacitor's maximum charging power P2 - drive power P.

6. The hybrid battery power supply control method according to claim 1, characterized in that, in, When the required torque T≥0, the vehicle is in driving mode. At this time, the battery outputs electrical energy to the MCU to drive the motor, and the battery is in discharging mode. When the required torque T<0, the vehicle is in energy recovery mode. At this time, the motor converts mechanical energy into electrical energy and charges the battery through the MCU, and the battery is in charging mode.

7. A hybrid battery-powered control system, characterized in that, The hybrid battery power supply control method according to any one of claims 1-6, wherein the hybrid battery control system comprises: First state acquisition module: used to acquire the current state of the electric vehicle; Second state acquisition module: used to acquire the current state of the hybrid battery; Condition judgment module: used to determine whether the hybrid battery is currently in power supply mode or energy recovery mode; Control module: used to control the hybrid battery to supply power to the motor controller or the motor controller to recover electrical energy to the hybrid battery, as well as the charging and discharging process between the hybrid batteries; Execution module: Used to execute instructions issued by the control module; If the vehicle controller determines that the vehicle is in driving mode, "the first battery management system of the lithium battery and the second battery management system of the supercapacitor respectively calculate the remaining capacity, maximum charging power and maximum discharging power of the corresponding battery pack, and feed the calculated information back to the vehicle controller. The vehicle controller processes the feedback information" including the following steps: The first battery management system determines the maximum discharge power of the lithium battery and sends the maximum discharge power to the vehicle controller. The vehicle controller then compares the drive power with the maximum discharge power. When the drive power > the maximum discharge power, the supercapacitor system supplies power to the motor controller. When the driving power is less than or equal to the maximum discharge power, the first battery management system collects the remaining capacity S1 of the lithium battery pack, and the second battery management system collects the remaining capacity S2 of the supercapacitor pack. The remaining capacities S1 and S2 are then sent to the vehicle controller. When the remaining capacity S1 is greater than the remaining capacity S2, the lithium battery supplies power to the motor controller. When the remaining capacity S1 is less than or equal to the remaining capacity S2, the supercapacitor supplies power to the motor controller.

8. A readable storage medium, characterized in that, include: The readable storage medium stores one or more programs that, when executed by a processor, implement the hybrid battery power supply control method as described in any one of claims 1-6.

9. An electric vehicle, characterized in that, The electric vehicle includes a memory and a processor, wherein: Memory: Used to store computer programs; Processor: When executing a computer program stored in memory, implements the hybrid battery power supply control method as described in any one of claims 1-6.

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