Power battery voltage regulation circuit, system, control method and control device

Abstract

This application provides a power battery voltage regulation circuit, system, and control method and device thereof. The power battery voltage regulation circuit includes a power module, a heating module, a charging / discharging interface, and a voltage regulation switch assembly. The heating module includes an energy storage element and a switch module. The power module includes at least a first power battery and a second power battery. The power module and the switch module are connected in parallel. An external charging / discharging device is connected in parallel with the power module through the charging / discharging interface. The voltage regulation switch assembly includes multiple switches disposed between the charging / discharging interface and the power module. The voltage regulation switch assembly and the switch module are used to regulate the charging / discharging voltage between the external charging / discharging device and the power module in response to a voltage regulation control signal. This application achieves the switching of different charging / discharging circuits by controlling the voltage regulation switch assembly and the switch module, thereby realizing different charging / discharging requirements under the voltage regulation control signal.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a power battery voltage regulation circuit, system, control method and control device thereof. Background Technology

[0002] Due to their advantages such as high energy density, rechargeability, safety, and environmental friendliness, power modules are widely used in new energy vehicles, consumer electronics, and energy storage systems. With the development of battery technology, the performance of power modules is constantly improving, especially their voltage, which has generally seen significant increases.

[0003] However, the maximum output voltage of currently used charging equipment is still lower than the charging voltage required by new power modules with higher voltages, and the power modules also have difficulty adjusting their output voltage according to the needs of different load devices. Therefore, how to flexibly adjust the charging and discharging voltage of the power module in different scenarios is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a power battery voltage regulation system and its control method and device, which can flexibly adjust the charging and discharging voltage of the power module to meet the power module's requirements for charging or discharging voltage in different scenarios.

[0005] In a first aspect, this application provides a power battery voltage regulation circuit, including a power module, a heating module, a charging / discharging interface, and a voltage regulation switch assembly; the heating module includes an energy storage element and a switch module; the power module includes at least a first power battery and a second power battery; the power module and the switch module are connected in parallel; an external charging / discharging device is connected in parallel with the power module through the charging / discharging interface; the voltage regulation switch assembly includes multiple switches, which are disposed between the charging / discharging interface and the power module; the voltage regulation switch assembly and the switch module are used to regulate the charging / discharging voltage between the external charging / discharging device and the power module in response to a voltage regulation control signal.

[0006] The power battery voltage regulation circuit provided in this application embodiment realizes the switching of different charging and discharging circuits by controlling the voltage regulation switch assembly and switch module. In this way, it can flexibly and efficiently adjust the charging and discharging voltage between the external charging and discharging equipment and the power module under different charging and discharging requirements under the voltage regulation control signal. For example, the circuits of buck charging, boost charging, boost discharging and buck discharging are formed in the same circuit structure to meet the charging voltage or discharging voltage requirements of the power module under different scenarios.

[0007] In some embodiments, the voltage regulation switch assembly includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch. The first switch and the third switch are respectively disposed on the positive and negative sides of the charging and discharging interface; the second switch is disposed between the positive side of the first power battery and the first end of the switch module; the fifth switch is disposed between the negative side of the first power battery and the second end of the switch module; and the fourth switch is disposed between the negative side of the first power battery and the positive side of the second power battery.

[0008] The power battery voltage regulation circuit provided in this application fully considers the voltage regulation requirements of the power module during charging and discharging under different conditions. Switches are set at different positions in the charging and discharging circuit of the power module to achieve different charging and discharging circuit switching purposes. Furthermore, by controlling the on and off states of different switches in the voltage regulation switch assembly and switch module, buck charging, boost charging, boost discharging, and buck discharging circuits can be formed in the same circuit structure. Therefore, the charging and discharging voltage of the power module can be flexibly adjusted without changing the circuit structure to meet the charging or discharging voltage requirements of the power module in different scenarios.

[0009] In some embodiments, the switching module includes a charge / discharge switching module and a bridge arm group connected in parallel. One end of the first switch is connected to the positive terminal of the charge / discharge interface, and the other end of the first switch is connected to the first terminal of the charge / discharge switching module. One end of the third switch is connected to the negative terminal side of the charge / discharge interface, and the other end of the third switch is connected to the second terminal of the charge / discharge switching module. One end of the second switch is connected to the positive terminal side of the first power battery, and the other end of the second switch is collinearly connected to all the upper bridge arms of the bridge arm group. One end of the fifth switch is connected to the negative terminal side of the first power battery, and the other end of the fifth switch, all the lower bridge arms of the bridge arm group, and the second terminal of the charge / discharge switching module are collinearly connected. The positive terminal side of the second power battery is also connected to the first terminal of the charge / discharge switching module.

[0010] The embodiments provided in this application set switches at different positions in the charging and discharging circuit of the power module to achieve the purpose of switching between different charging and discharging circuits. The output voltage can be flexibly adjusted according to the needs of the load device without changing the circuit structure. At the same time, the power battery voltage regulation system itself provides energy to the motor by utilizing its own circuit structure. The power module can be charged and discharged by increasing or decreasing voltage in the same circuit through the conduction and disconnection of different switches.

[0011] In some embodiments, the switching module includes a charge-discharge switching module and a bridge arm group connected in parallel, a first end of the energy storage element is connected to the bridge arm group, and a second end of the energy storage element is connected to the charge-discharge switching module.

[0012] The power battery voltage regulation circuit provided in this application embodiment stores and provides energy during the charging and discharging process through the charging and discharging switching module and the bridge arm assembly under different charging and discharging requirements, ensuring the voltage boosting or bucking between the external charging and discharging equipment and the power module.

[0013] In some embodiments, the energy storage element includes an M-phase motor; the bridge arm group includes an M-phase bridge arm, where M is a positive integer; the M-phase windings of the M-phase motor are respectively connected to the upper and lower bridge arm connection points of each phase bridge arm in the M-phase bridge arm; the charge-discharge switching module includes a first switching circuit and a second switching circuit connected in series; the connection point of the first switching circuit and the second switching circuit is connected to the neutral point of the M-phase motor.

[0014] The power battery voltage regulation circuit provided in this application embodiment stores and provides energy during the charging and discharging process through the charge-discharging switching module and the bridge arm assembly under different charging and discharging requirements, ensuring the voltage boosting or bucking between the external charging and discharging equipment and the power module. The charge-discharging switching module further ensures free switching between charging and discharging between the battery and the motor, the motor and external equipment, and the battery and external equipment.

[0015] In some embodiments, both the first switching circuit and the second switching circuit include a transistor and a freewheeling diode connected in parallel.

[0016] The power battery voltage regulation circuit provided in this application improves the efficiency of the charge / discharge switching module in freely switching between the battery and the motor, the motor and external devices, and the battery and external devices by using parallel transistors and freewheeling diodes.

[0017] In some embodiments, both the first switching circuit and the second switching circuit include a transistor or a relay switch.

[0018] The power battery voltage regulation circuit provided in this application improves the efficiency of the charge / discharge switching module in freely switching between the battery and the motor, the motor and external devices, and the battery and external devices by using transistors or relay switches.

[0019] In some embodiments, the first switching circuit includes a diode and the second switching circuit includes a switch; or, the first switching circuit includes a switch and the second switching circuit includes a diode.

[0020] The power battery voltage regulation circuit provided in this application improves the efficiency of the charge / discharge switching module in freely switching between the battery and the motor, the motor and external devices, and the battery and external devices by freely combining and connecting diodes and switches in parallel.

[0021] In some embodiments, a first voltage-stabilizing capacitor is connected in parallel across the two ends of the power module, and a second voltage-stabilizing capacitor is connected in parallel across the two ends of the charging / discharging interface.

[0022] The power battery voltage regulation circuit provided in this application embodiment ensures the stability and continuity of the voltage at both ends of the power module or the charging and discharging interface during the charging and discharging process through the first voltage stabilizing capacitor and the second voltage stabilizing capacitor.

[0023] In some embodiments, the current flowing through all windings of the M-phase motor is equal in magnitude and phase.

[0024] In some embodiments, the motor is a three-phase motor.

[0025] The power battery voltage regulation circuit provided in this application embodiment ensures that the current in all windings of the motor is equal in magnitude and phase, thereby guaranteeing the control synchronicity and flexibility of the bridge arm switch in the bridge arm group.

[0026] Secondly, this application provides an electrical device, including a control module and a power battery voltage regulation circuit according to any one of the first aspects above; the control module is connected to a switch module and a voltage regulation switch assembly, and is used to control the voltage regulation switch assembly and the switch module to regulate the charging and discharging voltage between the external charging and discharging device and the power module.

[0027] The electrical equipment provided in this application embodiment realizes the switching of different charging and discharging circuits through the control module and the power battery voltage regulation circuit. In this way, it can flexibly and efficiently adjust the charging and discharging voltage between the external charging and discharging equipment and the power module under different charging and discharging requirements under the voltage regulation control signal. For example, the same circuit structure can form circuits for buck charging, boost charging, boost discharging and buck discharging respectively to meet the charging voltage or discharging voltage requirements of the power module under different scenarios.

[0028] Thirdly, this application provides a power battery voltage regulation system, including an external charging and discharging device and the electrical device mentioned in the second aspect above, wherein the external charging and discharging device is connected to the charging and discharging interface in the electrical device.

[0029] The power battery voltage regulation system provided in this application embodiment realizes the switching of different charging and discharging circuits through external charging and discharging equipment and electrical equipment. In this way, it can flexibly and efficiently adjust the charging and discharging voltage between the external charging and discharging equipment and the power module under different charging and discharging requirements under voltage regulation control signals. For example, it can form a buck charging, boost charging, boost discharging and buck discharging circuit in the same circuit structure to meet the charging voltage or discharging voltage requirements of the power module in different scenarios.

[0030] Fourthly, this application provides a power battery voltage regulation method, applied to the power battery voltage regulation system of the third aspect, comprising: acquiring a first voltage of the power module and acquiring a second voltage of the external charging and discharging device during the charging and discharging process of the external charging and discharging device and the power module; and controlling a voltage regulation switch assembly and a switch module to regulate the charging and discharging voltage between the external charging and discharging device and the power module according to the first voltage and the second voltage.

[0031] The power battery voltage regulation method provided in this application realizes the switching of different charging and discharging circuits through the voltage regulation switch assembly and switch module in the power battery voltage regulation system. In this way, it can flexibly and efficiently regulate the charging and discharging voltage between the external charging and discharging equipment and the power module under different charging and discharging requirements under the voltage regulation control signal. For example, it can form a buck charging, boost charging, boost discharging and buck discharging circuit in the same circuit structure to meet the charging voltage or discharging voltage requirements of the power module in different scenarios.

[0032] In some embodiments, the first voltage is the battery voltage of the power module, and the second voltage is the output voltage of the external charging and discharging device. Based on the first and second voltages, the voltage regulating switch assembly and switch module are controlled to adjust the charging and discharging voltage between the external charging and discharging device and the power module. Specifically, this includes: when the battery voltage is less than the output voltage, controlling the voltage regulating switch assembly and switch module to reduce the charging voltage of the external charging and discharging device to charge the power module; and when the battery voltage is greater than the output voltage, controlling the voltage regulating switch assembly and switch module to increase the charging voltage of the external charging and discharging device to charge the power module.

[0033] The power battery voltage regulation method provided in this application flexibly adjusts the charging voltage of the power module based on the relationship between the voltage of the charging device and the power module. Simultaneously, it utilizes the circuit structure of the power battery voltage regulation system itself to provide energy to the motor, enabling boost charging of the power module through the switching on and off of different switches within the same circuit. This allows the charging device to charge power modules with voltages lower than its maximum output voltage, as well as those with voltages higher than its maximum output voltage. This control method can flexibly adjust the charging voltage of the power module in different scenarios, solving compatibility issues with external charging and discharging devices and ensuring that the charging process of the power module is not limited by the maximum output voltage of the charging device.

[0034] In some embodiments, when the battery voltage is greater than the output voltage, the voltage regulation switch assembly and the switch module are controlled to increase the charging voltage of the external charging and discharging device to charge the power module. Specifically, this includes: in a first period, controlling the external charging and discharging device to charge the energy storage element; and in a second period, controlling the external charging and discharging device and the energy storage element to charge the power battery together.

[0035] The power battery voltage regulation method provided in this application embodiment can, without changing the circuit structure, first control the external charging and discharging device to charge the energy storage element when the battery voltage is greater than the output voltage, and then control the external charging and discharging device and the energy storage element to charge the power battery together, thereby achieving continuous charging with boost voltage.

[0036] In some embodiments, the switching module includes a parallel charge / discharge switching module and a bridge arm group; the voltage regulating switching assembly includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; when the battery voltage is greater than the output voltage, the voltage regulating switching assembly and the switching module are controlled to increase the charging voltage of the external charging / discharging device charging the power module, specifically including: in a first time period, controlling the first switch and the third switch to be turned on, the first switching circuit of the charge / discharge switching module and all lower bridge arms of the bridge arm group to be turned on, the second switching circuit of the charge / discharge switching module, all upper bridge arms of the bridge arm group to be turned off, and the second switch, the fourth switch, and the fifth switch to be turned off; in a second time period, controlling the first switch, the second switch, the third switch, and the fourth switch to be turned on, the first switching circuit of the charge / discharge switching module and all upper bridge arms of the bridge arm group to be turned on, and the second switching circuit of the charge / discharge switching module, all lower bridge arms of the bridge arm group, and the fifth switch to be turned off; wherein, the control of the first time period and the control of the second time period are continuously alternated.

[0037] The embodiments provided in this application can flexibly adjust the voltage output to the power module according to different voltages of the charging device without changing the circuit structure. At the same time, the circuit structure of the power battery voltage regulation system itself is used to provide energy to the motor. The charging voltage of the external charging and discharging device to charge the power module can be increased by turning on and off different switches in the same circuit, so that the charging device can charge the power module when the battery voltage is higher than the maximum output voltage of the charging device.

[0038] During the charging process of the power module, the first and second time periods are alternately controlled to achieve continuous charging after voltage boost, ensuring the continuous charging process.

[0039] In some embodiments, when the battery voltage is lower than the output voltage, the voltage regulation switch assembly and switch module are controlled to reduce the charging voltage of the external charging and discharging device to charge the power module. Specifically, this includes: in a first period, controlling the external charging and discharging device to charge the energy storage element; and in a second period, controlling the energy storage element to charge the power battery.

[0040] The power battery voltage regulation method provided in this application embodiment can, without changing the circuit structure, first control the external charging and discharging equipment to charge the energy storage element when the battery voltage is lower than the output voltage, and then control the energy storage element to charge the power battery, thereby achieving continuous charging with reduced voltage. In some embodiments, the switching module includes a parallel charge / discharge switching module and a bridge arm group; the voltage regulating switching assembly includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; when the battery voltage is lower than the output voltage, the voltage regulating switching assembly and the switching module are controlled to reduce the charging voltage of the external charging / discharging device charging the power module, specifically including: in a first time period, controlling the first switch and the third switch to be turned on, the first switching circuit of the charge / discharge switching module and all lower bridge arms of the bridge arm group to be turned on, the second switching circuit of the charge / discharge switching module, all upper bridge arms of the bridge arm group to be turned off, and the second switch, the fourth switch, and the fifth switch to be turned off; in a second time period, controlling the second switch and the fourth switch to be turned on, the fifth switch to be turned off, the second switching circuit of the charge / discharge switching module and all upper bridge arms of the bridge arm group to be turned on, and the first switching circuit of the charge / discharge switching module, all lower bridge arms of the bridge arm group, the first switch, the third switch, and the fifth switch to be turned off; wherein, the control of the first time period and the control of the second time period are continuously alternated. The power battery voltage regulation method provided in this application embodiment can flexibly adjust the voltage output to the power module according to the different voltages of the charging device without changing the circuit structure. At the same time, it can provide energy to the motor by utilizing the circuit structure of the power battery voltage regulation system itself. It can reduce the charging voltage of the external charging and discharging device to charge the power module by turning on and off different switches in the same circuit, so that the charging device can charge the power module when the battery voltage is lower than the maximum output voltage of the charging device.

[0041] In some embodiments, the first voltage is the output voltage of the power module, and the second voltage is the requested voltage of the external charging / discharging device acting as a load. Based on the first and second voltages, the voltage regulation switch assembly and switch module are controlled to adjust the charging / discharging voltage between the external charging / discharging device and the power module. Specifically, this includes: acquiring the battery voltage of the power module during the charging / discharging process of the external charging / discharging device and the electrical device; acquiring the requested voltage of the external charging / discharging device acting as a load; and controlling the voltage regulation switch assembly and switch module to adjust the charging / discharging voltage between the external charging / discharging device and the power module based on the battery voltage and the requested voltage.

[0042] The control method of the power battery voltage regulation system provided in this application embodiment can adapt to various load devices with different voltage requirements under different conditions by controlling the voltage regulation switch assembly and switch module without changing the circuit structure. This allows the power battery voltage regulation system to provide power to load devices with a voltage requirement higher than the power module voltage, as well as load devices with a voltage requirement lower than the power module voltage. This enables flexible adjustment of the power module's discharge voltage in different scenarios to provide power to various load devices.

[0043] In some embodiments, the voltage regulation switch assembly and switch module are controlled to adjust the charging and discharging voltage between the external charging and discharging device and the power module according to the battery voltage and the requested voltage. Specifically, this includes: when the output voltage of the power module is greater than the requested voltage, controlling the voltage regulation switch assembly and switch module to reduce the battery voltage of the power module; and when the output voltage of the power module is less than the requested voltage, controlling the voltage regulation switch assembly and switch module to increase the battery voltage of the power module.

[0044] Under different conditions, by controlling the voltage regulation switch assembly and switch module, the power battery voltage regulation system can provide power to load devices with a required voltage higher than the power module voltage, as well as load devices with a required voltage lower than the power module voltage. This enables flexible adjustment of the power module's discharge voltage in different scenarios, providing power to various load devices.

[0045] In some embodiments, when the output voltage of the power module is less than the requested voltage, the voltage regulation switch assembly and the switch module are controlled to increase the battery voltage of the power module. Specifically, this includes: in a first period, controlling the power battery to charge the energy storage element; and in a second period, controlling the power battery and the energy storage element to charge the external charging and discharging device together.

[0046] The power battery voltage regulation method provided in this application embodiment can, without changing the circuit structure, first control the power battery to charge the energy storage element when the output voltage of the power module is less than the requested voltage, and then control the power battery and the energy storage element to charge the external charging and discharging equipment together, thereby achieving continuous discharge with boosted voltage.

[0047] In some embodiments, the switching module includes a charge / discharge switching module and a bridge arm group connected in parallel; the voltage regulating switching assembly includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; controlling the voltage regulating switching assembly and the switching module to reduce the battery voltage of the power module specifically includes: in a first time period, controlling the second switch and the fourth switch to be turned on, the fifth switch to be turned off, the second switching circuit of the charge / discharge switching module and all upper bridge arms of the bridge arm group to be turned on, and the first switching circuit of the charge / discharge switching module, all lower bridge arms of the bridge arm group, the first switch, the third switch, and the fifth switch to be turned off; in a second time period, controlling the first switch, the second switch, the third switch, and the fourth switch to be turned on, the first switching circuit of the charge / discharge switching module and all upper bridge arms of the bridge arm group to be turned on, and the lower bridge arms of the charge / discharge switching module and all lower bridge arms of the bridge arm group and the fifth switch to be turned off; wherein, the control of the first time period and the control of the second time period are continuously alternated.

[0048] The embodiments provided in this application can flexibly adjust the output voltage according to the needs of the load device without changing the circuit structure. At the same time, the power battery voltage regulation system itself provides energy to the motor by utilizing its own circuit structure. It can achieve voltage reduction and discharge of the power module by turning on and off different switches in the same circuit, so that the power battery voltage regulation system can provide power to load devices whose required voltage is lower than the power module voltage.

[0049] During the charging process of the power module, the continuous discharge after voltage reduction is achieved by alternating control of the first and second time periods, ensuring the continuous discharge process.

[0050] In some embodiments, when the output voltage of the power module is greater than the requested voltage, the voltage regulation switch assembly and the switch module are controlled to reduce the battery voltage of the power module. Specifically, this includes: in a first period, controlling the power battery to charge the energy storage element; and in a second period, controlling the energy storage element to charge the external charging and discharging device.

[0051] The power battery voltage regulation method provided in this application embodiment can, without changing the circuit structure, first control the power battery to charge the energy storage element when the output voltage of the power module is greater than the requested voltage, and then control the energy storage element to charge the external charging and discharging equipment, thereby achieving continuous discharge with reduced voltage.

[0052] In some embodiments, the switching module includes a charge / discharge switching module and a bridge arm group connected in parallel; the voltage regulating switching assembly includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; controlling the voltage regulating switching assembly and the switching module to increase the battery voltage of the power module specifically includes: in a first time period, controlling the second switch and the fourth switch to be turned on, the fifth switch to be turned off, the second switching circuit of the charge / discharge switching module and all upper bridge arms of the bridge arm group to be turned on, and the first switching circuit of the charge / discharge switching module, all lower bridge arms of the bridge arm group, the first switch, the third switch, and the fifth switch to be turned off; in a second time period, controlling the first switch, the third switch, the first switching circuit of the charge / discharge switching module and all lower bridge arms of the bridge arm group to be turned on, and the second switching circuit of the charge / discharge switching module and all upper bridge arms of the bridge arm group, the third switch, the fourth switch, and the fifth switch to be turned off; wherein, the control of the first time period and the control of the second time period are continuously alternated.

[0053] The embodiments provided in this application can flexibly adjust the output voltage according to the needs of the load device without changing the circuit structure. At the same time, the power battery voltage regulation system itself provides energy to the motor by utilizing its own circuit structure. It can achieve boost discharge of the power module by turning on and off different switches in the same circuit, so that the power battery voltage regulation system can provide power to load devices whose required voltage is higher than the power module voltage.

[0054] During the charging process of the power module, the continuous discharge after voltage boost is achieved by alternating control of the first and second time periods, ensuring the continuous discharge process.

[0055] Fifthly, this application provides a power module voltage regulation device, comprising: a memory for storing executable instructions; and a processor for connecting to the memory to execute the executable instructions to complete the power battery voltage regulation method as described in any of the fourth aspects.

[0056] The power module voltage regulation device provided in this application embodiment realizes the switching of different charging and discharging circuits through the voltage regulation switch assembly and switch module in the power battery voltage regulation system. In this way, it can flexibly and efficiently adjust the charging and discharging voltage between the external charging and discharging equipment and the power module under different charging and discharging requirements under the voltage regulation control signal. For example, it can form a buck charging, boost charging, boost discharging and buck discharging circuit in the same circuit structure to meet the charging voltage or discharging voltage requirements of the power module in different scenarios.

[0057] Sixthly, this application provides a computer-readable storage medium having a computer program stored thereon; the computer program is executed by a processor to implement the power battery voltage regulation method as described in any of the fourth aspects.

[0058] The computer-readable storage medium provided in this application embodiment realizes the switching of different charging and discharging circuits through the voltage regulation switch assembly and switch module in the power battery voltage regulation system. This enables flexible and efficient adjustment of the charging and discharging voltage between the external charging and discharging equipment and the power module under different charging and discharging requirements under the voltage regulation control signal. For example, the circuits of buck charging, boost charging, boost discharging and buck discharging are formed in the same circuit structure to meet the charging voltage or discharging voltage requirements of the power module in different scenarios. Attached Figure Description

[0059] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application 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 the drawings without creative effort.

[0060] Figure 1 This is a schematic diagram of an application architecture for the charging method provided in an embodiment of this application.

[0061] Figure 2 This is a schematic block diagram of the power battery voltage regulation circuit provided in the embodiments of this application.

[0062] Figure 3 This is a schematic block diagram of the electrical equipment provided in the embodiments of this application.

[0063] Figure 4 This is a schematic block diagram of the power battery voltage regulation system provided in the embodiments of this application.

[0064] Figure 5 This is a schematic flowchart of a control method for a power battery voltage regulation system provided in an embodiment of this application.

[0065] Figure 6 This is a schematic flowchart of a control method for a power battery voltage regulation system provided in another embodiment of this application.

[0066] Figure 7 , 8 Figure 9 is a schematic diagram of different charging circuits for charging the power module in the power battery voltage regulation system provided in the embodiments of this application.

[0067] Figure 10 This is a schematic flowchart of another control method for a power battery voltage regulation system provided in the embodiments of this application.

[0068] Figure 11 This is a schematic flowchart of another control method for a power battery voltage regulation system provided in the embodiments of this application.

[0069] Figure 12 , 13 Figures 1 and 14 are schematic diagrams of different charging circuits for charging external loads in the power battery voltage regulation system provided in the embodiments of this application.

[0070] Figure 15 This is a schematic diagram of the power module voltage regulation structure provided in the embodiment of this application.

[0071] The accompanying drawings are not drawn to scale. Detailed Implementation

[0072] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0073] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0074] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0075] With the development of battery technology, the performance of power modules is constantly improving, especially their voltage, which has generally seen a significant increase. For these new power modules with higher voltages, only charging equipment capable of outputting a correspondingly higher voltage can charge them. However, most currently used charging equipment can only charge traditional power modules with lower voltages, and their maximum output voltage cannot meet the requirements of the new power modules. Replacing all charging equipment to adapt to the new power modules would waste existing equipment and increase unnecessary costs.

[0076] In addition, with the development of various load devices (such as vehicle-mounted devices), the output voltage of the power module required by different load devices is not the same. Therefore, a method is needed to enable the power module to adjust the output voltage more flexibly during the discharge process to meet the needs of different load devices.

[0077] In view of this, embodiments of this application provide a power battery voltage regulation system and its control method and control device. The power battery voltage regulation system includes a power module, a switch module, a charging and discharging interface and a motor. By controlling the on and off of different switches in the switch module, buck charging or boost charging can be achieved in different scenarios, or boost discharging or buck discharging can be achieved in different scenarios.

[0078] The power module in this application embodiment can be a lithium-ion battery, lithium metal battery, lead-acid battery, nickel-metal hydride battery, lithium-sulfur battery, lithium-air battery, or sodium-ion battery, etc., and is not limited thereto. In terms of scale, the battery in this application embodiment can be a single cell, a battery module, or a battery pack, and is not limited thereto. In terms of application scenarios, the battery can be used in power devices such as automobiles and ships. For example, it can be used in electric vehicles to power the motor, serving as the power source for electric vehicles. The battery can also power other electrical components in electric vehicles, such as in-vehicle air conditioning and in-vehicle media players.

[0079] For ease of description, the following will use the application of power modules in new energy vehicles (powered vehicles) as an example.

[0080] The drive motor and its control system are among the core components of new energy vehicles, and their driving characteristics determine the main performance indicators of the vehicle. The motor drive system of a new energy vehicle mainly consists of an electric motor, a power converter, a motor controller (e.g., an inverter), various sensors, and a power supply. An electric motor is a rotating electromagnetic machine that operates based on the principle of electromagnetic induction, used to convert electrical energy into mechanical energy. During operation, it absorbs electrical power from the electrical system and outputs mechanical power to the mechanical system.

[0081] Figure 1 This diagram illustrates an application architecture for the charging method described in this application. The architecture includes a Battery Management System (BMS) 10 and a charging pile 20. The BMS 10 can be connected to the charging pile 20 via a communication cable to exchange information. For example, the communication cable can be a Controller Area Network (CAN) communication cable or a daisy-chain communication cable.

[0082] In this embodiment, BMS 10 is the BMS for the power module, which is a battery that provides power to the electrical device. Optionally, the power module can be a power storage battery. Regarding the type of battery, the power module can be a lithium-ion battery, lithium metal battery, lead-acid battery, nickel-metal hydride battery, lithium-sulfur battery, lithium-air battery, or sodium-ion battery, etc., and is not specifically limited in this application embodiment. Regarding the battery size, the power module in this application embodiment can be a cell / battery unit, or a battery module or battery pack, and is not specifically limited in this application embodiment. Optionally, the electrical device can be a vehicle, ship, or spacecraft, etc., and this application embodiment is not limited in this regard. The BMS is a control system that protects the power module and implements functions such as charge / discharge management, high-voltage control, battery protection, battery data collection, and battery status evaluation. The BMS can be integrated with the power module in the same device, or it can be a separate device located outside the power module.

[0083] Charging station 20, also known as a charger, is a device for charging the power module. The charging station can output charging power according to the charging requirements of BMS 10 to charge the power module. For example, charging station 20 can output voltage and current according to the required voltage and current sent by BMS 10.

[0084] To meet the charging voltage requirements of power modules in different scenarios, this application provides a power battery voltage regulation system.

[0085] Figure 2 This is a schematic block diagram of the power battery voltage regulation circuit 200 provided in the embodiments of this application.

[0086] like Figure 2 As shown, this application provides a power battery voltage regulation circuit 200, including a power module 240, a heating module, a charging / discharging interface 260, and a voltage regulation switch assembly; the heating module includes an energy storage element and a switching module. The power module includes at least a first power battery 241 and a second power battery 242.

[0087] The power module 240 is connected in parallel with the switch module; the external charging and discharging device is connected in parallel with the power module 240 through the charging and discharging interface 260.

[0088] The voltage regulation switch assembly includes multiple switches, which are disposed between the charging / discharging interface 260 and the power module 240. The voltage regulation switch assembly and switch module are used to regulate the charging / discharging voltage between the external charging / discharging device and the power module 240 in response to the voltage regulation control signal.

[0089] The power battery voltage regulation circuit provided in this application embodiment realizes the switching of different charging and discharging circuits by controlling the voltage regulation switch assembly and switch module. In this way, it can flexibly and efficiently adjust the charging and discharging voltage between the external charging and discharging equipment and the power module 240 under different charging and discharging requirements under the voltage regulation control signal. For example, the circuits of buck charging, boost charging, boost discharging and buck discharging are formed in the same circuit structure to meet the charging voltage or discharging voltage requirements of the power module 240 in different scenarios.

[0090] In specific implementation, the voltage regulation switch assembly includes a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, and a fifth switch K5; the first switch K1 and the third switch K3 are respectively disposed on the positive and negative sides of the charging and discharging interface 260; the second switch K2 is disposed between the positive side of the first power battery 241 and the first end of the switch module; the fifth switch K5 is disposed between the negative side of the first power battery 241 and the second end of the switch module; and the fourth switch K4 is disposed between the negative side of the first power battery 241 and the positive side of the second power battery 242.

[0091] Based on this, the power battery voltage regulation circuit in this embodiment fully considers the voltage regulation requirements of the power module 240 during charging and discharging under different conditions. Switches are set at different positions in the charging and discharging circuit of the power module 240 to achieve the purpose of switching between different charging and discharging circuits.

[0092] Meanwhile, by controlling the on and off of different switches in the voltage regulation switch assembly and switch module, loops for buck charging, boost charging, boost discharging and buck discharging can be formed in the same circuit structure. Thus, the charging and discharging voltage of the power module 240 can be flexibly adjusted without changing the circuit structure to meet the charging or discharging voltage requirements of the power module 240 in different scenarios.

[0093] Further details on the implementation methods, such as Figure 2As shown, the switching module includes a parallel charge / discharge switching module 221 and a bridge arm group 222. One end of the first switch K1 is connected to the positive terminal of the charge / discharge interface, and the other end of the first switch K1 is connected to the first terminal of the charge / discharge switching module. One end of the third switch K3 is connected to the negative terminal of the charge / discharge interface, and the other end of the third switch K3 is connected to the second terminal of the charge / discharge switching module. One end of the second switch K2 is connected to the positive terminal of the first power battery, and the other end of the second switch K2 is collinearly connected to all the upper bridge arms of the bridge arm group. One end of the fifth switch K5 is connected to the negative terminal of the first power battery, and the other end of the fifth switch K5, all the lower bridge arms of the bridge arm group, and the second terminal of the charge / discharge switching module are collinearly connected. The positive terminal of the second power battery is also connected to the first terminal of the charge / discharge switching module.

[0094] Based on this, in this embodiment, switches are set at different positions in the charging and discharging circuit of the power module 240 to achieve the purpose of switching between different charging and discharging circuits. The output voltage can be flexibly adjusted according to the needs of the load device without changing the circuit structure. At the same time, the power battery voltage regulation system itself provides energy to the motor 210 by utilizing its own circuit structure. The power module 240 can be charged and discharged by increasing or decreasing voltage in the same circuit through the conduction and disconnection of different switches.

[0095] In some embodiments, the switching module includes a charge-discharge switching module 221 and a bridge arm group 222 connected in parallel. The first end of the energy storage element is connected to the bridge arm group 222, and the second end of the energy storage element is connected to the charge-discharge switching module 221.

[0096] Based on this, the power battery voltage regulation circuit in this embodiment stores and provides energy during the charging and discharging process through the charging and discharging switching module 221 and the bridge arm group 222 under different charging and discharging requirements, ensuring the voltage boosting or bucking of the charging and discharging between the external charging and discharging equipment and the power module 240.

[0097] Specifically, such as Figure 2 As shown, the energy storage element includes an M-phase motor 210 and windings connected to the M-phase motor 210.

[0098] Furthermore, the bridge arm group 222 includes M-phase bridge arms, where M is a positive integer; the M-phase windings of the M-phase motor 210 are respectively connected to the upper and lower bridge arm connection points of each phase bridge arm in the M-phase bridge arm.

[0099] The charge / discharge switching module 221 includes a first switching circuit 2211 and a second switching circuit 2212 connected in series; the connection point of the first switching circuit 2211 and the second switching circuit 2212 is connected to the neutral point of the M-phase motor 210.

[0100] Based on this, the power battery voltage regulation circuit in this embodiment stores and provides energy during charging and discharging through the charge / discharge switching module 221 and the bridge arm assembly 222 under different charging and discharging requirements, ensuring the voltage boosting or bucking between the external charging / discharging equipment and the power module 240. The charge / discharge switching module 221 further ensures free switching between charging and discharging between the battery and the motor 210, between the motor 210 and external equipment, and between the battery and external equipment.

[0101] In some embodiments, such as Figure 2 As shown, both the first switching circuit 2211 and the second switching circuit 2212 include a transistor and a freewheeling diode connected in parallel.

[0102] The power battery voltage regulation circuit provided in this application improves the efficiency of the charge / discharge switching module 221 in freely switching between the battery and motor 210, the motor 210 and external devices, and the battery and external devices by using parallel transistors and freewheeling diodes.

[0103] In other embodiments, both the first switching circuit 2211 and the second switching circuit 2212 include transistors or relay switches.

[0104] This improves the efficiency of the charge / discharge switching module 221 in freely switching between the battery and motor 210, the motor 210 and external devices, and the battery and external devices by using transistors or relay switches.

[0105] In other embodiments, not shown in the figures, the first switching circuit 2211 includes a diode and the second switching circuit 2212 includes a switch; or, the first switching circuit 2211 includes a switch and the second switching circuit 2212 includes a diode.

[0106] By freely combining and paralleling diodes and switches, the charging and discharging switching module 221 improves the efficiency of freely switching between charging and discharging between the battery and motor 210, the motor 210 and external devices, and the battery and external devices.

[0107] In some embodiments, not shown in the figures, a sixth switch is provided between the connection point of the first switching circuit 2211 and the second switching circuit 2212 and the neutral point of the M-phase motor 210. Thus, through the sixth switch, flexible switching between the first switching circuit 2211 or the second switching circuit 2212 in the charge / discharge switching module 221 and the neutral point of the motor 210 is achieved, ensuring free switching between charging and discharging.

[0108] In some embodiments, not shown in the figure, the second switch K2 is connected in parallel with a branch, which includes a resistor and a seventh switch connected in series. Thus, the series resistor and the seventh switch branch enable flexible coordination with the second switch K2, thereby accurately regulating the charging and discharging voltage between the external charging and discharging device and the power module 240.

[0109] like Figure 2 As shown, in some embodiments, a first voltage-stabilizing capacitor C1 is connected in parallel across the two ends of the power module 240, and a second voltage-stabilizing capacitor C2 is connected in parallel across the two ends of the charging / discharging interface 260.

[0110] Furthermore, the first voltage-stabilizing capacitor C1 and the second voltage-stabilizing capacitor C2 ensure the stability and continuity of the voltage at both ends of the power module 240 or the charging / discharging interface 260 during the charging and discharging process.

[0111] Additionally, please refer to Figure 2 The circuit is further explained below:

[0112] The first switch K1, the second switch K2, the third switch K3, the fourth switch K4, and the fifth switch K5 in the switch module can be relay switches. The control module controls these switches to open or close, so as to form different circuits.

[0113] The bridge arm group 222 and the charge / discharge switching module 221 can be implemented by an inverter in the motor 210 drive system, wherein the inverter can be implemented using bridge arm switches of insulated gate bipolar transistors (IGBTs). The number of bridge arms in the bridge arm group 222 is the same as the number of inductors in the motor 210. For example, if the motor 210 is a three-phase motor 210, then the inverter includes three-phase bridge arms, namely, U-phase bridge arms, V-phase bridge arms, and W-phase bridge arms. Each of the three-phase bridge arms has an upper bridge arm and a lower bridge arm, and each upper bridge arm and lower bridge arm is provided with a switching unit. That is, the bridge arm group 222 includes an upper bridge arm switch 1211 and a lower bridge arm switch 1212 in the U-phase bridge arm, an upper bridge arm switch 1213 and a lower bridge arm switch 1214 in the V-phase bridge arm, and an upper bridge arm switch 1215 and a lower bridge arm switch 1216 in the W-phase bridge arm. The charge / discharge switching module 221 also has an upper bridge arm and a lower bridge arm, and each of the upper and lower bridge arms is provided with a switching unit. That is, the charge / discharge switching module 221 includes an upper bridge arm switch 1221 and a lower bridge arm switch 1222.

[0114] For the M-phase motor 210, multiple inductors may be included. The current flowing through all windings of the M-phase motor is equal in magnitude and phase. Taking a three-phase motor 210 as an example, it may include three inductors, specifically: an inductor connected to the U-phase bridge arm, an inductor connected to the V-phase bridge arm, and an inductor connected to the W-phase bridge arm. One end of each inductor is connected to the connection point between the upper and lower bridge arms of the U-phase bridge arm, the V-phase bridge arm, and the W-phase bridge arm. The other ends of the inductors are connected together at this connection point, which is the three-phase center point of the motor 210.

[0115] It should be noted that the motor 210 is not limited to a three-phase motor 210, but can also be a six-phase motor 210, etc. Correspondingly, the six-phase motor 210 may include a six-phase bridge arm.

[0116] The second capacitor C2 is used to stabilize the input voltage of the charging / discharging interface 260 and absorb the voltage spikes when the charging / discharging switching module 221 is disconnected, thus preventing damage to the charging / discharging switching module 221. Both the first capacitor C1 and the second capacitor C2 can function as voltage regulators and filter out noise.

[0117] The power battery voltage regulation system 200 provided in this application fully considers the voltage regulation requirements of the power module 240 during charging and discharging under different conditions. Switches are set at key points in the charging and discharging circuit of the power module 240, and by controlling the conduction and disconnection of different switches, circuits for buck charging, boost charging, boost discharging and buck discharging are formed in the same circuit structure. Therefore, the charging and discharging voltage of the power module 240 can be flexibly adjusted without changing the circuit structure to meet the charging or discharging voltage requirements of the power module 240 in different scenarios.

[0118] Figure 3 This is a schematic block diagram of the electrical equipment 300 provided in the embodiments of this application.

[0119] like Figure 3 As shown, the electrical equipment 300 includes a control module 100 and a power battery voltage regulation circuit 200.

[0120] The control module is connected to the switch module and voltage regulation switch assembly, and is used to control the voltage regulation switch assembly and switch module to regulate the charging and discharging voltage between the external charging and discharging equipment and the power module 240.

[0121] Optionally, the device for acquiring the battery voltage and output voltage can be a BMS in the control module, and the device for controlling the switching in the switch module to turn the switches on or off can be a microcontroller unit (MCU) in the control module or a motor controller. The BMS can compare the acquired battery voltage and output voltage to determine the charging method and communicate with the MCU. For example, when the battery voltage is lower than the output voltage, the BMS sends a first message to the MCU, which indicates that a buck charging method should be used. The MCU can then control the corresponding switch to turn on or off based on the first message, forming a buck charging circuit.

[0122] Based on this, the electrical equipment provided in this embodiment further realizes the switching of different charging and discharging circuits through the control module and the power battery voltage regulation circuit, thereby realizing the flexible and efficient adjustment of the charging and discharging voltage between the external charging and discharging equipment and the power module 240 under different charging and discharging requirements under the voltage regulation control signal. For example, the circuits of buck charging, boost charging, boost discharging and buck discharging are formed in the same circuit structure to meet the charging voltage or discharging voltage requirements of the power module 240 in different scenarios.

[0123] Figure 4 This is a schematic block diagram of the power battery voltage regulation system provided in the embodiments of this application.

[0124] like Figure 4 As shown, this application provides a power battery voltage regulation system, including an external charging and discharging device 40 and an electrical device 300, wherein the external charging and discharging device 40 is connected to the charging and discharging interface 260 in the electrical device 300.

[0125] Based on this, the power battery voltage regulation system provided in this application embodiment realizes the switching of different charging and discharging circuits through external charging and discharging equipment and electrical equipment, thereby realizing flexible and efficient adjustment of the charging and discharging voltage between the external charging and discharging equipment and the power module 240 under different charging and discharging requirements under voltage regulation control signals. For example, in the same circuit structure, circuits for buck charging, boost charging, boost discharging and buck discharging are formed respectively to meet the charging voltage or discharging voltage requirements of the power module 240 in different scenarios.

[0126] Figure 5 This is a schematic flowchart of a control method for a power battery voltage regulation system provided in an embodiment of this application.

[0127] like Figure 5 As shown, the power battery voltage regulation method is applied to the power battery voltage regulation system in the third aspect, and specifically includes the following steps:

[0128] S1: During the charging and discharging process of the external charging and discharging device and the power device, the first voltage of the power module 240 and the second voltage of the external charging and discharging device are obtained.

[0129] Then, based on the first voltage and the second voltage, the voltage regulating switch assembly and switch module are controlled to regulate the charging and discharging voltage between the external charging and discharging device and the power module 240.

[0130] Based on this, the power battery voltage regulation method of this embodiment realizes the switching of different charging and discharging circuits through the voltage regulation switch component and switch module in the power battery voltage regulation system. In this way, it can flexibly and efficiently regulate the charging and discharging voltage between the external charging and discharging equipment and the power module 240 under different charging and discharging requirements under the voltage regulation control signal. For example, in the same circuit structure, circuits for buck charging, boost charging, boost discharging and buck discharging are formed respectively to meet the charging voltage or discharging voltage requirements of the power module 240 under different scenarios.

[0131] In one implementation scenario, the first voltage is the battery voltage of the power module 240, and the second voltage is the output voltage of the external charging and discharging device.

[0132] Based on the first voltage and the second voltage, the control voltage regulating switch assembly and switch module regulate the charging and discharging voltage between the external charging and discharging device and the power module 240, specifically including:

[0133] S11: When the battery voltage is greater than the output voltage, control the voltage regulation switch assembly and switch module to increase the charging voltage of the external charging and discharging equipment to charge the power module.

[0134] S12: When the battery voltage is lower than the output voltage, control the voltage regulation switch assembly and switch module to reduce the charging voltage of the external charging and discharging equipment to charge the power module.

[0135] Based on this power battery voltage regulation method, the charging voltage of the power module 240 can be flexibly adjusted according to the relationship between the voltage of the charging device and the power module 240. Simultaneously, the circuit structure of the power battery voltage regulation system itself provides energy to the motor 210. Boost charging of the power module 240 can be achieved within the same circuit by switching different switches on and off. This allows the charging device to charge both power modules 240 with voltages lower than the charging device's maximum output voltage and power modules 240 with voltages higher than the charging device's maximum output voltage. This control method can flexibly adjust the charging voltage of the power module 240 in different scenarios, solving compatibility issues with external charging and discharging devices and ensuring that the charging process of the power module 240 is not limited by the maximum output voltage of the charging device.

[0136] Specifically, in the power battery voltage regulation method, step S11 includes: when the battery voltage is greater than the output voltage, controlling the voltage regulation switch assembly and switch module to increase the charging voltage of the external charging and discharging device for charging the power module. Specifically, this includes: in the first time period, controlling the external charging and discharging device to charge the energy storage element; and in the second time period, controlling the external charging and discharging device and the energy storage element to charge the power battery together. Without changing the circuit structure, when the battery voltage is greater than the output voltage, first controlling the external charging and discharging device to charge the energy storage element, and then controlling the external charging and discharging device and the energy storage element to charge the power battery together, achieves continuous voltage boosting and charging.

[0137] like Figure 6 As shown, S111: In the first time period, the first switch and the third switch are turned on, the first switching circuit of the charge-discharge switching module and all the lower bridge arms of the bridge arm group are turned on, the second switching circuit of the charge-discharge switching module, all the upper bridge arms of the bridge arm group are turned off, and the second switch, the fourth switch and the fifth switch are turned off.

[0138] Figure 7 This is a schematic diagram of the charging circuit of the power battery voltage regulation system at this time.

[0139] like Figure 7 As shown, at this time, the external charging device is connected to the motor inductor through the charging / discharging interface, and the motor inductor stores energy. The charging device only provides electrical energy to the motor 210, and the motor 210 stores energy through its own inductance.

[0140] S112: In the second time period, the first switch, the second switch, the third switch and the fourth switch are turned on, the first switching circuit of the charge-discharge switching module and all the upper bridge arms of the bridge arm group are turned on, and the second switching circuit of the charge-discharge switching module, all the lower bridge arms of the bridge arm group and the fifth switch are turned off.

[0141] Figure 8 This is a schematic diagram of the charging circuit of the power battery voltage regulation system at this time.

[0142] like Figure 8 As shown, at this time, the external charging pile is connected to the battery through the charging and discharging interface and the motor inductor, and the inductor and the external charging pile charge the battery together.

[0143] The charging device and the pre-stored energy motor 210 together provide power to the power module 240. In other words, the voltage provided by the charging device and the voltage provided by the motor 210 are superimposed, and the resulting voltage is greater than the voltage of the power module 240, thus charging the power module 240. The motor 210 can store energy in advance through the circuitry in the power battery voltage regulation system 200, or it can be powered by an external device.

[0144] Finally, the control of the first and second time periods is continuously alternated. During the charging process of the power module 240, the continuous charging after voltage boost is achieved through the alternating control of the first and second time periods, ensuring the continuous charging process.

[0145] The embodiments provided based on this implementation can flexibly adjust the voltage output to the power module 240 according to different voltages of the charging device without changing the circuit structure. At the same time, the circuit structure of the power battery voltage regulation system itself is used to provide energy to the motor 210. The charging voltage of the external charging and discharging device to charge the power module can be increased by turning on and off different switches in the same circuit, so that the charging device can charge the power module 240 when the battery voltage is higher than the maximum output voltage of the charging device.

[0146] Specifically, in the power battery voltage regulation method, step S12 includes: when the battery voltage is lower than the output voltage, controlling the voltage regulation switch assembly and switch module to reduce the charging voltage of the external charging and discharging equipment to charge the power module. Specifically, this includes: in a first time period, controlling the external charging and discharging equipment to charge the energy storage element; and in a second time period, controlling the energy storage element to charge the power battery. Without changing the circuit structure, when the battery voltage is lower than the output voltage, first controlling the external charging and discharging equipment to charge the energy storage element, and then controlling the energy storage element to charge the power battery, achieves continuous charging with reduced voltage.

[0147] like Figure 6 As shown, S121: In the first time period, the first switch and the third switch are turned on, the first switching circuit of the charge-discharge switching module and all the lower bridge arms of the bridge arm group are turned on, the second switching circuit of the charge-discharge switching module, all the upper bridge arms of the bridge arm group are turned off, and the second switch, the fourth switch and the fifth switch are turned off.

[0148] Figure 7 This is a schematic diagram of the charging circuit of the power battery voltage regulation system at this time.

[0149] like Figure 7 As shown, at this time, the external charging device is connected to the motor inductor through the charging / discharging interface, and the motor inductor stores energy. The charging device only provides electrical energy to the motor 210, and the motor 210 stores energy through its own inductance.

[0150] S122: In the second time period, the second and fourth switches are turned on, the fifth switch is turned off, the second switching circuit of the charge / discharge switching module and all upper bridge arms of the bridge arm group are turned on, and the first switching circuit of the charge / discharge switching module, all lower bridge arms of the bridge arm group, the first switch, the third switch and the fifth switch are turned off; wherein, the control of the first time period and the control of the second time period are continuously alternated.

[0151] Figure 9 This is a schematic diagram of the charging circuit of the power battery voltage regulation system at this time.

[0152] like Figure 9 As shown, an external charging device can be used to form a step-down charging circuit for the power module.

[0153] The power battery voltage regulation method provided in this application embodiment can flexibly adjust the voltage output to the power module 240 according to the different voltages of the charging device without changing the circuit structure. At the same time, it can provide energy to the motor 210 by utilizing the circuit structure of the power battery voltage regulation system itself. It can reduce the charging voltage of the external charging and discharging device to charge the power module by turning on and off different switches in the same circuit, so that the charging device can charge the power module 240 when the battery voltage is lower than the maximum output voltage of the charging device.

[0154] In another preferred embodiment, during the process of the power module charging the external load as a power source, whether discharging or charging, it is necessary to go through step S111 or S121, which are the same steps, and it is necessary to first store energy for the motor inductor through the power module.

[0155] Therefore, step S111 or S121 is performed first, that is, in the first time period, the first switch and the third switch are turned on, the first switching circuit of the charge / discharge switching module and all lower bridge arms of the bridge arm group are turned on, the second switching circuit of the charge / discharge switching module, all upper bridge arms of the bridge arm group are turned off, and the second switch, the fourth switch, and the fifth switch are turned off. Then, depending on whether the voltage is boosted or bucked, step S212 or S222 is performed. Details are omitted here; please refer to the aforementioned scheme.

[0156] In another implementation scenario, the first voltage is the battery voltage of the power module 240, and the second voltage is the requested voltage of the external charging and discharging device that serves as the load.

[0157] Figure 10 This is a schematic flowchart of another control method for a power battery voltage regulation system provided in the embodiments of this application.

[0158] like Figure 10As shown, based on the first voltage and the second voltage, the voltage regulating switch assembly and switch module adjust the charging and discharging voltage between the external charging and discharging device and the power module 240, specifically including:

[0159] S2: During the charging and discharging process of the external charging and discharging device and the electrical equipment, the battery voltage of the power module 240 is obtained, i.e., the first voltage; the external charging and discharging device acts as a load, and the requested voltage of the external charging and discharging device is obtained, i.e., the second voltage.

[0160] Then, based on the battery voltage and the requested voltage, the voltage regulating switch assembly and switch module are controlled to regulate the charging and discharging voltage between the external charging and discharging equipment and the power module 240.

[0161] Based on this, the control method of the power battery voltage regulation system in this embodiment can adapt to various load devices with different voltage requirements under different conditions by controlling the voltage regulation switch assembly and switch module without changing the circuit structure. This allows the power battery voltage regulation system to provide power to load devices with a voltage requirement higher than that of the power module 240, as well as load devices with a voltage requirement lower than that of the power module 240. This enables flexible adjustment of the discharge voltage of the power module 240 in different scenarios to provide power to various load devices.

[0162] Specifically, based on the battery voltage and the requested voltage, the control voltage regulation switch assembly and switch module adjust the charging and discharging voltage between the external charging and discharging equipment and the power module 240, including:

[0163] S21: When the output voltage of the power module is less than the requested voltage, control the voltage regulation switch assembly and switch module to increase the battery voltage of the power module 240.

[0164] S22: When the output voltage of the power module is greater than the output voltage, control the voltage regulation switch assembly and switch module to reduce the battery voltage of the power module 240.

[0165] Under different conditions, by controlling the voltage regulation switch assembly and switch module, the power battery voltage regulation system can provide power to load devices with a required voltage higher than that of the power module 240, as well as to load devices with a required voltage lower than that of the power module 240. This enables flexible adjustment of the discharge voltage of the power module 240 in different scenarios, providing power to a variety of load devices.

[0166] Specifically, in the power battery voltage regulation method, step S21 includes: in the first time period, controlling the power battery to charge the energy storage element; in the second time period, controlling the power battery and the energy storage element to charge the external charging and discharging device together. Without changing the circuit structure, when the output voltage of the power module is less than the requested voltage, the power battery is first controlled to charge the energy storage element, and then the power battery and the energy storage element are controlled to charge the external charging and discharging device together, achieving boosted continuous discharge.

[0167] like Figure 11 As shown, S211: In the first time period, the second switch and the fourth switch are turned on, the fifth switch is turned off, the second switching circuit of the charge-discharge switching module and all the upper bridge arms of the bridge arm group are turned on, and the first switching circuit of the charge-discharge switching module, all the lower bridge arms of the bridge arm group, the first switch, the third switch and the fifth switch are turned off.

[0168] Figure 12 This is a schematic diagram of the charging circuit of the power battery voltage regulation system at this time.

[0169] like Figure 12 As shown, at this time, the battery energy is used to store energy in the motor inductor, and the power module 240 only provides power to the motor 210, which stores energy through its own inductor.

[0170] S212: In the second time period, control the first switch, the second switch, the third switch and the fourth switch to be turned on, the first switching circuit of the charge-discharge switching module and all the upper bridge arms of the bridge arm group are turned on, and the lower bridge arm of the charge-discharge switching module and all the lower bridge arms of the bridge arm group and the fifth switch are turned off.

[0171] Figure 13 This is a schematic diagram of the charging circuit of the power battery voltage regulation system at this time.

[0172] like Figure 13 As shown, at this time, the battery voltage of the power module 240 is increased, and the battery and motor inductor are used as power sources to output power to the external load.

[0173] The power module 240 and the motor 210, which has pre-stored energy, together provide power to the load device. In other words, the voltage provided by the power module 240 and the voltage provided by the motor 210 are superimposed, and the superimposed voltage can match the requested voltage of the load device, thus providing power to the load device.

[0174] Finally, the control of the first and second time periods is continuously alternated. During the charging process of the power module 240, the continuous discharge after voltage boost is achieved through the alternating control of the first and second time periods, ensuring the continuous progress of the discharge process.

[0175] The embodiments provided in this application can flexibly adjust the output voltage according to the needs of the load device without changing the circuit structure. At the same time, the power battery voltage regulation system itself provides energy to the motor 210 by utilizing its own circuit structure. It can achieve boost discharge of the power module 240 by turning on and off different switches in the same circuit, so that the power battery voltage regulation system can provide power to load devices whose required voltage is higher than that of the power module 240.

[0176] Specifically, in the power battery voltage regulation method, when the battery voltage is greater than the output voltage, step S22 specifically includes: in the first time period, controlling the power battery to charge the energy storage element; and in the second time period, controlling the energy storage element to charge the external charging and discharging equipment. Without changing the circuit structure, when the output voltage of the power module is greater than the requested voltage, the power battery is first controlled to charge the energy storage element, and then the energy storage element is controlled to charge the external charging and discharging equipment, achieving continuous discharge with reduced voltage.

[0177] like Figure 11 As shown, S221: In the first time period, the second switch and the fourth switch are turned on, the fifth switch is turned off, the second switching circuit of the charge / discharge switching module and all upper bridge arms of the bridge arm group are turned on, and the first switching circuit of the charge / discharge switching module, all lower bridge arms of the bridge arm group, the first switch, the third switch and the fifth switch are turned off.

[0178] Figure 12 This is a schematic diagram of the charging circuit of the power battery voltage regulation system at this time.

[0179] like Figure 12 As shown, at this time, the battery energy is used to store energy in the motor inductor. The power module 240 only provides power to the motor 210, and the motor 210 stores energy through its own inductor.

[0180] S222: In the second time period, the first switch, the third switch, the first switching circuit of the charge / discharge switching module and all the lower bridge arms of the bridge arm group are turned on, and the second switching circuit of the charge / discharge switching module and all the upper bridge arms of the bridge arm group, the third switch, the fourth switch and the fifth switch are turned off.

[0181] Figure 14 This is a schematic diagram of the charging circuit of the power battery voltage regulation system at this time.

[0182] like Figure 14 As shown, at this time, the battery voltage of the power module 240 is reduced, and the motor inductor is used as a power source to output power to the external load.

[0183] In the circuit formed by step-down charging, only the motor 210, which has pre-stored energy, provides power to the load device. The energy pre-stored in the motor 210 can be provided by the circuit of the power battery voltage regulation system 200 itself.

[0184] Finally, the control of the first and second time periods is continuously alternated. During the charging process of the power module 240, the continuous discharge after voltage reduction is achieved through the alternating control of the first and second time periods, ensuring the continuous progress of the discharge process.

[0185] In summary, the output voltage can be flexibly adjusted according to the needs of the load device without changing the circuit structure. At the same time, the power battery voltage regulation system itself provides energy to the motor 210 by utilizing its own circuit structure. The power module 240 can be de-voltaged and discharged by switching different switches on and off in the same circuit, so that the power battery voltage regulation system can provide power to load devices whose required voltage is lower than that of the power module 240.

[0186] In another preferred embodiment, during the process of the power module charging the external load as a power source, whether discharging or charging, it is necessary to go through step S211 or S221, which are the same steps, and it is necessary to first store energy for the motor inductor through the power module.

[0187] Therefore, step S211 or S221 is performed first, that is, in the first time period, the second switch and the fourth switch are turned on, the fifth switch is turned off, the second switching circuit of the charge-discharge switching module and all the upper bridge arms of the bridge arm group are turned on, and the first switching circuit of the charge-discharge switching module, all the lower bridge arms of the bridge arm group, the first switch, the third switch and the fifth switch are turned off.

[0188] Then, depending on whether the voltage is increased or decreased, proceed with S212 or S222. Details will not be elaborated here; please refer to the aforementioned scheme.

[0189] Figure 15 The diagram shows a structural schematic of a power module voltage regulation device 400 according to an embodiment of this application.

[0190] like Figure 15 As shown, the power module voltage regulation device 400 includes: a memory 402 for storing executable instructions; and a processor 401 for connecting to the memory 402 to execute the executable instructions to complete the motion vector prediction method.

[0191] Those skilled in the art will understand that the illustration Figure 15This is merely an example of the power module voltage regulator 400 and does not constitute a limitation on the power module voltage regulator 400. It may include more or fewer components than shown, or combine certain components, or different components. For example, the power module voltage regulator 400 may also include input / output devices, network access devices, buses, etc.

[0192] The processor 401 (Central Processing Unit, CPU) can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor, or processor 401 can be any conventional processor. Processor 401 is the control center of the power module voltage regulation device 400, connecting all parts of the power module voltage regulation device 400 through various interfaces and lines.

[0193] The memory 402 can be used to store computer-readable instructions. The processor 401 implements various functions of the power module voltage regulation device 400 by running or executing the computer-readable instructions or modules stored in the memory 402 and calling the data stored in the memory 402. The memory 402 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the power module voltage regulation device 400, etc. In addition, the memory 402 may include a hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, read-only memory (ROM), random access memory (RAM), or other non-volatile / volatile storage devices.

[0194] If the integrated module of the power module voltage regulation device 400 is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by instructing related hardware through computer-readable instructions. The computer-readable instructions can be stored in a computer-readable storage medium, and when executed by a processor, the computer-readable instructions can implement the steps of the various method embodiments described above.

[0195] The power module voltage regulation device provided in this application embodiment realizes the switching of different charging and discharging circuits through the voltage regulation switch assembly and switch module in the power battery voltage regulation system. In this way, it can flexibly and efficiently adjust the charging and discharging voltage between the external charging and discharging equipment and the power module 240 under different charging and discharging requirements under the voltage regulation control signal. For example, it can form a buck charging, boost charging, boost discharging and buck discharging circuit in the same circuit structure to meet the charging voltage or discharging voltage requirements of the power module 240 in different scenarios.

[0196] Finally, this application also provides a computer-readable storage medium having a computer program stored thereon; the computer program is executed by a processor to implement a power battery voltage regulation method.

[0197] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0198] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0199] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0200] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0201] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0202] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0203] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power cell voltage regulation circuit, characterized by, The power module, the heating module, the charging and discharging interface, and the voltage regulating switch assembly are included. The heating module includes an energy storage element and a switch module. The power module includes at least a first power battery and a second power battery. The power module is connected in parallel with the switch module; and an external charging and discharging device is connected in parallel with the power module through the charging and discharging interface. The voltage regulating switch assembly includes a plurality of switches, which are arranged between the charging and discharging interface and the power module. The voltage regulating switch assembly and the switch module are used to adjust the charging and discharging voltage between the external charging and discharging device and the power module in response to a voltage regulating control signal. The plurality of switches include a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; the first switch and the third switch are arranged on the positive side and the negative side of the charging and discharging interface, respectively; the second switch is arranged between the positive side of the first power battery and the first end of the switch module; the fifth switch is arranged between the negative side of the first power battery and the second end of the switch module; and the fourth switch is arranged between the negative side of the first power battery and the positive side of the second power battery. The switch module includes a charging and discharging switching module and a bridge arm group connected in parallel; one end of the first switch is connected to the positive pole of the charging and discharging interface; the other end of the first switch is connected to the first end of the charging and discharging switching module; one end of the third switch is connected to the negative pole of the charging and discharging interface; the other end of the third switch is connected to the second end of the charging and discharging switching module; one end of the second switch is connected to the positive side of the first power battery; the other end of the second switch is connected to all upper bridge arms of the bridge arm group in line; one end of the fifth switch is connected to the negative side of the first power battery; the other end of the fifth switch, all lower bridge arms of the bridge arm group, and the second end of the charging and discharging switching module are connected in line; and the positive side of the second power battery is also connected to the first end of the charging and discharging switching module. One end of the energy storage element is connected to the bridge arm group, and the other end of the energy storage element is connected to the charging and discharging switching module.

2. The regulation circuit of claim 1, wherein, The energy storage element includes an M-phase motor; the bridge arm group includes M-phase bridge arms, where M is a positive integer; and the M-phase windings of the M-phase motor are connected to the upper and lower bridge arm connection points of each phase bridge arm in the M-phase bridge arms in one-to-one correspondence. The charging and discharging switching module includes a first switching circuit and a second switching circuit connected in series; and the connection points of the first switching circuit and the second switching circuit are connected to the neutral point of the M-phase motor.

3. The regulating circuit as claimed in claim 2, characterized in that The first switching circuit and the second switching circuit each include a triode and a freewheeling diode connected in parallel.

4. The regulation circuit as claimed in claim 2, characterized in that The first switching circuit and the second switching circuit each include a triode or a relay switch.

5. The regulation circuit as recited in claim 2, wherein The first switching circuit includes a diode, and the second switching circuit includes a switch; or the first switching circuit includes a switch, and the second switching circuit includes a diode.

6. The regulation circuit according to any one of claims 1 to 5, characterized in that First voltage stabilizing capacitors are connected in parallel at both ends of the power module, and second voltage stabilizing capacitors are connected in parallel at both ends of the charging and discharging interface.

7. The regulation circuit according to any one of claims 2 to 5, characterized in that, The currents flowing through all the windings of the electric machine are equal in magnitude and identical in phase.

8. The conditioning circuit of any one of claims 2 to 5, wherein, The electric machine is a three-phase electric machine.

9. An electric device, characterized by The power battery voltage regulation circuit comprises a control module and a power module. The control module is connected with the switch module and the voltage regulation switch assembly, and is configured to control the voltage regulation switch assembly and the switch module to regulate the charging and discharging voltage between the external charging and discharging device and the power module.

10. A power battery voltage regulation system comprising an external charging and discharging device and the use electric device of claim 9, wherein the external charging and discharging device is connected with the charging and discharging interface in the use electric device.

11. A method of regulating the voltage of a power cell, characterized by, The power battery voltage regulation system of claim 10 comprises: obtaining a first voltage of the power module and a second voltage of the external charging and discharging device; controlling the voltage regulation switch assembly and the switch module to regulate the charging and discharging voltage between the external charging and discharging device and the power module according to the first voltage and the second voltage.

12. The method of claim 11, wherein, The first voltage is the battery voltage of the power module, and the second voltage is the output voltage of the external charging and discharging device; or, the first voltage is the output voltage of the power module, and the second voltage is the requested voltage of the external charging and discharging device as a load.

13. The method of claim 12, wherein, The controlling the voltage regulation switch assembly and the switch module to regulate the charging and discharging voltage between the external charging and discharging device and the power module according to the first voltage and the second voltage specifically comprises: when the battery voltage is greater than the output voltage, controlling the voltage regulation switch assembly and the switch module to increase the charging voltage of the external charging and discharging device to the power module; when the battery voltage is less than the output voltage, controlling the voltage regulation switch assembly and the switch module to decrease the charging voltage of the external charging and discharging device to the power module.

14. The method of claim 13, wherein, The controlling the voltage regulation switch assembly and the switch module to increase the charging voltage of the external charging and discharging device to the power module specifically comprises: in a first time period, controlling the external charging and discharging device to charge the energy storage element; in a second time period, controlling the external charging and discharging device and the energy storage element to charge the power battery together.

15. The power cell voltage regulation method of claim 13 or 14, wherein, The controlling the voltage regulation switch assembly and the switch module to increase the charging voltage of the external charging and discharging device to the power module specifically comprises: in a first time period, controlling the first switch and the third switch to be turned on, the first switching circuit of the charging and discharging switching module and all the lower bridge arms of the bridge arm group to be turned on, the second switching circuit of the charging and discharging switching module, all the upper bridge arms of the bridge arm group, the second switch, the fourth switch and the fifth switch to be turned off; in a second time period, controlling the first switch, the second switch, the third switch and the fourth switch to be turned on, the first switching circuit of the charging and discharging switching module and all the upper bridge arms of the bridge arm group to be turned on, the second switching circuit of the charging and discharging switching module, all the lower bridge arms of the bridge arm group and the fifth switch to be turned off; The control of the first time period and the control of the second time period are alternately and continuously performed.

16. The method of claim 13, wherein, The control of the voltage regulating switch assembly and the switch module to reduce the charging voltage of the external charging and discharging device to the power module when the battery voltage is less than the output voltage specifically includes: In the first time period, the external charging and discharging device is controlled to charge the energy storage element; In the second time period, the energy storage element is controlled to charge the power battery.

17. The method of claim 13 or 16, wherein, The control of the voltage regulating switch assembly and the switch module to reduce the charging voltage of the external charging and discharging device to the power module specifically includes: In the first time period, the first switch and the third switch are controlled to be turned on, the first switching circuit of the charging and discharging switch module and all the lower bridge arms of the bridge arm group are turned on, the second switching circuit of the charging and discharging switch module, all the upper bridge arms of the bridge arm group, the second switch, the fourth switch and the fifth switch are turned off; In the second time period, the second switch and the fourth switch are controlled to be turned on, the fifth switch is turned off, the second switching circuit of the charging and discharging switch module and all the upper bridge arms of the bridge arm group are turned on, the first switching circuit of the charging and discharging switch module, all the lower bridge arms of the bridge arm group, the first switch, the third switch and the fifth switch are turned off; The control of the first time period and the control of the second time period are alternately and continuously performed.

18. A power module voltage regulating device, characterized by, It comprises: a memory for storing executable instructions; and a processor connected with the memory to execute the executable instructions to complete the power battery voltage regulating method as claimed in any one of claims 11-17.

19. A computer-readable storage medium, characterized in that, A computer program is stored thereon; the computer program is executed by a processor to realize the power battery voltage regulating method as claimed in any one of claims 11-17.

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