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

Abstract

A power battery voltage regulation circuit includes a power battery (11), a heating module, a charge and discharge interface (13), and a voltage regulation switch assembly; the heating module includes an energy storage element and a switch module; the power battery (11) is connected in parallel with the switch module; an external charge and discharge device is connected in parallel with the power battery (11) through the charge and discharge interface (13); the voltage regulation switch assembly includes a plurality of switches, and the plurality of switches are arranged between the charge and discharge interface (13) and the power battery (11); the voltage regulation switch assembly and the switch module are used to adjust the charge and discharge voltage between the external charge and discharge device and the power battery (11) in response to a voltage regulation control signal. An electrical equipment, a power battery voltage regulation system, a regulation method, and a regulation device are also provided. By controlling the voltage regulation switch assembly and the switch module, the switching of different charge and discharge circuits is realized, and thus different charge and discharge requirements under the voltage regulation control signal are realized.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a power battery voltage regulation circuit, a system, a control method and a control device thereof. Background Art

[0002] Due to advantages such as high energy density, rechargeability, safety and environmental protection, power batteries are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields. With the development of battery technology, various performances of power batteries are constantly improving, especially the voltage of power batteries, which generally has a significant increase.

[0003] However, the maximum output voltage of the currently used charging equipment is still lower than the charging voltage required by the new power batteries with higher voltage, and it is also difficult for power batteries to adjust the output voltage according to the requirements of different load devices. Therefore, how to flexibly adjust the charging and discharging voltage of power batteries in different scenarios is an urgent problem to be solved. Summary of the Invention

[0004] The embodiments of the present application provide a power battery voltage regulation system, a control method and a control device thereof, which can flexibly adjust the charging and discharging voltage of power batteries to meet the requirements of power batteries for charging voltage or discharging voltage in different scenarios.

[0005] In a first aspect, the present application provides a power battery voltage regulation circuit, including a power battery, a heating module, a charging and discharging interface and a voltage regulation switch assembly; the heating module includes an energy storage element and a switch module; the power battery is connected in parallel with the switch module; an external charging and discharging device is connected in parallel with the power battery through the charging and discharging interface; the voltage regulation switch assembly includes a plurality of switches, and the plurality of switches are arranged between the charging and discharging interface and the power battery; the voltage regulation 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 battery in response to a voltage regulation control signal.

[0006] The power battery voltage regulation circuit provided by the embodiments of the present application realizes the switching of different charging and discharging circuits by controlling the voltage regulation switch assembly and the switch module, and further realizes flexible and efficient adjustment of the charging and discharging voltage between the external charging and discharging device and the power battery under different charging and discharging requirements of the voltage regulation control signal. For example: directly charging, boost charging, boost discharging and buck discharging circuits are respectively formed in the same circuit structure to meet the requirements of the charging voltage or discharging voltage of the power battery in 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 second switch are respectively disposed on the positive side and the negative side of the power battery; the fourth switch and the fifth switch are respectively disposed on the positive side and the negative side of the charge-discharge interface; the third switch is disposed between the positive electrode of the power battery and the charge-discharge interface.

[0008] The power battery voltage regulation circuit provided by the embodiments of the present application fully considers the requirements for voltage regulation during the charge and discharge of the power battery in different situations, and switches are arranged at different positions in the charge and discharge circuits of the power battery to achieve different purposes of switching the charge and discharge circuits. By controlling the conduction and disconnection of different switches in the voltage regulation switch assembly and the switch module, circuits for direct charging, boost charging, boost discharging, and buck discharging can be respectively formed in the same circuit structure, so that the charge and discharge voltage of the power battery can be flexibly adjusted without changing the circuit structure to meet the requirements of the charge voltage or discharge voltage of the power battery in different scenarios.

[0009] In some embodiments, one end of the first switch is connected to the positive electrode of the power battery, and the other end of the first switch is connected to the first end of the switch module; one end of the second switch is connected to the negative electrode of the power battery, and the other end of the second switch is connected to the second end of the switch module; the switch module includes a charge-discharge switching module and a bridge arm group connected in parallel. One end of the third switch is connected in common with all the upper bridge arms of the bridge arm group, and the other end of the third switch is connected to the first end of the charge-discharge switching module; one end of the fourth switch is connected to the positive electrode of the charge-discharge interface, and the other end of the fourth switch is connected to the first end of the charge-discharge switching module; one end of the fifth switch is connected to the negative electrode of the charge-discharge interface, and the other end of the fifth switch is connected in common with the second end of the charge-discharge switching module and all the lower bridge arms of the bridge arm group.

[0010] The embodiments provided by the present application arrange switches at different positions in the charge and discharge circuits of the power battery to achieve different purposes of switching the charge and discharge circuits. Without changing the circuit structure, the output voltage can be flexibly adjusted according to the requirements of the load device. At the same time, the circuit structure of the power battery voltage regulation system itself is used to provide energy for the motor, and boost discharging of the power battery can be realized through the conduction and disconnection of different switches in the same circuit.

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

[0012] The power battery voltage regulation circuit provided by the embodiments of the present application stores energy and provides energy during the charge and discharge processes through the charge-discharge switching module and the bridge arm group under different charge and discharge requirements, ensuring the boost or buck of the charge and discharge voltage between the external charge and discharge device and the power battery.

[0013] In some embodiments, the energy storage element includes an M-phase motor; the armature group includes M-phase arms, where M is a positive integer; the M-phase windings of the M-phase motor are respectively connected to the connection points of the upper and lower arms of each phase of the M-phase arms in a one-to-one correspondence; the charge and 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 by the embodiments of the present application stores energy and provides energy during the charge and discharge process through the charge and discharge switching module and the armature group under different charge and discharge requirements, ensuring the boost or buck of the charge and discharge voltage between the external charge and discharge device and the power battery. The charge and discharge switching module further ensures the free switching of charge and discharge between the battery and the motor, the motor and the external device, and the battery and the external device.

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

[0016] The power battery voltage regulation circuit provided by the embodiments of the present application improves the efficiency of the free switching of charge and discharge between the battery and the motor, the motor and the external device, and the battery and the external device through the triode and the freewheeling diode connected in parallel.

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

[0018] The power battery voltage regulation circuit provided by the embodiments of the present application improves the efficiency of the free switching of charge and discharge between the battery and the motor, the motor and the external device, and the battery and the external device through the triode or the relay switch.

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

[0020] The power battery voltage regulation circuit provided by the embodiments of the present application improves the efficiency of the free switching of charge and discharge between the battery and the motor, the motor and the external device, and the battery and the external device through the free combination and parallel connection of the diode and the switch.

[0021] In some embodiments, a sixth switch is provided between the connection point of the first switching circuit and the second switching circuit and the neutral point of the M-phase motor.

[0022] The power battery voltage regulation circuit provided by the embodiments of the present application realizes the flexible switching between the first switching circuit and the second switching circuit in the charge and discharge switching module and the neutral point of the motor through the sixth switch, ensuring the free switching of charge and discharge.

[0023] In some embodiments, a first voltage stabilizing capacitor is connected in parallel across both ends of the power battery, and a second voltage stabilizing capacitor is connected in parallel across both ends of the charging and discharging interface.

[0024] The power battery voltage regulation circuit provided by the embodiments of the present application ensures the stability and continuity of the voltage across both ends of the power battery or the charging and discharging interface during the charging and discharging process through the first voltage stabilizing capacitor and the second voltage stabilizing capacitor.

[0025] In some embodiments, a branch is connected in parallel to the second switch, and the branch includes a resistor and a seventh switch connected in series.

[0026] The power battery voltage regulation circuit provided by the embodiments of the present application realizes flexible cooperation with the second switch through the series-connected resistor and the seventh switch branch, and thus accurately regulates the charging and discharging voltage between the external charging and discharging device and the power battery.

[0027] In a second aspect, the present application provides an electrical device, including a control module and the power battery voltage regulation circuit according to any one of the embodiments in the first aspect above; the control module is connected to the switch module and the 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 battery.

[0028] The electrical device provided by the embodiments of the present application realizes the switching of different charging and discharging circuits through the control module and the power battery voltage regulation circuit, and thus flexibly and efficiently regulates the charging and discharging voltage between the external charging and discharging device and the power battery under different charging and discharging requirements of the voltage regulation control signal. For example, direct charging, boost charging, boost discharging, and buck discharging circuits are respectively formed in the same circuit structure to meet the requirements of the charging voltage or discharging voltage of the power battery in different scenarios.

[0029] In a third aspect, the present application provides a power battery voltage regulation system, including an external charging and discharging device and the electrical device in the second aspect above, and the external charging and discharging device is connected to the charging and discharging interface in the electrical device.

[0030] The power battery voltage regulation system provided by the embodiments of the present application realizes the switching of different charging and discharging circuits through the external charging and discharging device and the electrical device, and thus flexibly and efficiently regulates the charging and discharging voltage between the external charging and discharging device and the power battery under different charging and discharging requirements of the voltage regulation control signal. For example, direct charging, boost charging, boost discharging, and buck discharging circuits are respectively formed in the same circuit structure to meet the requirements of the charging voltage or discharging voltage of the power battery in different scenarios.

[0031] Fourthly, the present application provides a method for regulating the voltage of a power battery, which is applied to the power battery voltage regulation system of the third aspect, and includes: during the charging and discharging process between an external charging and discharging device and an electrical device, obtaining a first voltage of the power battery and obtaining a second voltage of the external charging and discharging device; 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 battery according to the first voltage and the second voltage.

[0032] The method for regulating the voltage of a power battery provided by the embodiments of the present application realizes the switching of different charging and discharging circuits through the voltage regulation switch assembly and the switch module in the power battery voltage regulation system, and further realizes the flexible and high-efficiency regulation of the charging and discharging voltage between the external charging and discharging device and the power battery under different charging and discharging requirements of the voltage regulation control signal. For example, in the same circuit structure, circuits for direct charging, boost charging, boost discharging, and buck discharging are respectively formed to meet the requirements of the charging voltage or discharging voltage of the power battery in different scenarios.

[0033] In some embodiments, the first voltage is the battery voltage of the power battery, and the second voltage is the output 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 battery according to the first voltage and the second voltage specifically includes: when the battery voltage is less than the output voltage, controlling the voltage regulation switch assembly and the switch module to enable the external charging and discharging device to charge the power battery; 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 for charging the power battery.

[0034] The method for regulating the voltage of a power battery provided by the embodiments of the present application flexibly regulates the charging voltage of the power battery according to the relationship between the voltage of the charging device and the power battery, and at the same time uses the circuit structure of the power battery voltage regulation system itself to provide energy for the motor, and can realize the boost charging of the power battery through the conduction and disconnection of different switches in the same circuit. This enables the charging device to charge a power battery with a voltage lower than the maximum output voltage of the charging device, and can also charge a power battery with a voltage higher than the maximum output voltage of the charging device. This control method can flexibly adjust the charging voltage of the power battery in different scenarios, which can not only solve the compatibility problem of the external charging and discharging device, but also make the charging process of the power battery not limited by the maximum output voltage of the charging device.

[0035] In some embodiments, the switching module includes a charge-discharge switching module and a leg group connected in parallel; the voltage regulation switch assembly includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; controlling the voltage regulation switch assembly and the switching module to charge the power battery with the external charge-discharge device specifically includes: controlling the first switch, the second switch, the third switch, the fourth switch, and the fifth switch to conduct, and all legs in the leg group and the charge-discharge switching module are disconnected.

[0036] The power battery voltage regulation method provided by the embodiments of the present application can flexibly regulate the voltage output to the power battery according to the different voltages of the charging device without changing the circuit structure, and at the same time use the circuit structure of the power battery voltage regulation system itself to provide energy for the motor, and can reduce the output voltage of the external charge-discharge device by turning on and off different switches in the same circuit, so that the charging device can charge the power battery whose battery voltage is lower than the maximum output voltage of the charging device.

[0037] In some embodiments, when the battery voltage is greater than the output voltage, controlling the voltage regulation switch assembly and the switching module to increase the charging voltage of the external charge-discharge device to charge the power battery specifically includes: in the first period, controlling the external charge-discharge device to charge the energy storage element; in the second period, controlling the external charge-discharge device and the energy storage element to charge the power battery together.

[0038] The power battery voltage regulation method provided by the embodiments of the present application can, without changing the circuit structure, when the battery voltage is greater than the output voltage, first control the external charge-discharge device to charge the energy storage element, and then control the external charge-discharge device and the energy storage element to charge the power battery together to achieve boost continuous charging.

[0039] In some embodiments, the switching module includes a charge-discharge switching module and a leg group connected in parallel; the voltage regulation switch assembly includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; controlling the voltage regulation switch assembly and the switching module to increase the charging voltage of the external charge-discharge device to charge the power battery specifically includes: in the first period, controlling the fourth switch, the fifth switch, all the lower legs in the leg group, and the first switching circuit of the charge-discharge switching module to conduct, and the first switch, the second switch, the third switch, all the upper legs in the leg group, and the second switching circuit of the charge-discharge switching module to be disconnected; in the second period, controlling the first switch, the second switch, the fourth switch, the fifth switch, all the upper legs in the leg group, and the first switching circuit of the charge-discharge switching module to conduct, and the third switch, all the lower legs in the leg group, and the second switching circuit of the charge-discharge switching module to be disconnected; wherein, the control in the first period and the control in the second period are continuously alternated.

[0040] The embodiments provided in this application can flexibly adjust the voltage output to the power battery 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 for the motor, and it is possible to increase the output voltage of the external charging and discharging device by turning on and off different switches in the same circuit, enabling the charging device to charge a power battery whose battery voltage is higher than the maximum output voltage of the charging device.

[0041] During the charging process of the power battery, through the alternating control of the first period and the second period, continuous charging after boosting is achieved to ensure the continuous progress of the charging process.

[0042] In some embodiments, the first voltage is the output voltage of the power battery, and the second voltage is the requested voltage of the external charging and discharging device as a load; according to the first voltage and the second voltage, the voltage regulation switch assembly and the switch module are controlled to adjust the charging and discharging voltage between the external charging and discharging device and the power battery, specifically including: when the output voltage is greater than the requested voltage, controlling the voltage regulation switch assembly and the switch module to reduce the charging voltage of the power battery to charge the external charging and discharging device; when the output voltage is less than the requested voltage, controlling the voltage regulation switch assembly and the switch module to increase the charging voltage of the power battery to charge the external charging and discharging device.

[0043] The control method of the power battery voltage regulation system provided by the embodiments of this application can, in different situations, by controlling the voltage regulation switch assembly and the switch module, adapt to various load devices with different required voltages without changing the circuit structure, enabling the power battery voltage regulation system to provide electrical energy for load devices whose required voltage is higher than the power battery voltage, and also providing electrical energy for load devices whose required voltage is lower than the power battery voltage, thereby realizing flexible adjustment of the discharge voltage of the power battery in different scenarios and providing electrical energy for a variety of load devices.

[0044] In some embodiments, controlling the voltage regulation switch assembly and the switch module to reduce the charging voltage of the power battery to charge the external charging and discharging device specifically includes: in the first period, controlling the power battery to charge the energy storage element; in the second period, controlling the energy storage element to charge the external charging and discharging device as a load.

[0045] The power battery voltage regulation method provided by the embodiments of this application can, without changing the circuit structure, when the battery voltage is greater than the output voltage, first control the power battery to charge the energy storage element, and control the energy storage element to charge the external charging and discharging device as a load to achieve step-down discharge.

[0046] In some embodiments, the switch module includes a charge-discharge switching module and a leg group connected in parallel; the voltage regulation switch assembly includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; controlling the voltage regulation switch assembly and the switch module to reduce the charging voltage of the power battery for charging the external charge-discharge device specifically includes: in a first period, the first switch, the second switch, all the upper legs of the leg group, and the second switching circuit of the charge-discharge switching module are turned on, and the third switch, the fourth switch, the fifth switch, all the lower legs of the leg group, and the first switching circuit of the charge-discharge switching module are turned off; in a second period, control the fourth switch, the fifth switch, all the lower legs of the leg group, and the first switching circuit of the charge-discharge switching module to be turned on, and the first switch, the second switch, the third switch, all the upper legs of the leg group, and the second switching circuit of the charge-discharge switching module to be turned off; wherein, the control of the first period and the control of the second period are continuously alternated.

[0047] The embodiments provided in this application can flexibly adjust the output voltage according to the requirements of the load device without changing the circuit structure, and at the same time use the circuit structure of the power battery voltage regulation system itself to provide energy for the motor, and can realize the step-down discharge of the power battery through the on and off of different switches in the same circuit, so that the power battery voltage regulation system provides electrical energy for load devices with a required voltage lower than the power battery voltage.

[0048] During the charging process of the power battery, through the alternating control of the first period and the second period, continuous discharge after step-down is realized to ensure the continuous progress of the discharge process.

[0049] In some embodiments, controlling the voltage regulation switch assembly and the switch module to increase the charging voltage of the power battery for charging the external charge-discharge device specifically includes: in a first period, controlling the power battery to charge the energy storage element; in a second period, controlling the power battery and the energy storage element to charge the external charge-discharge device as a load together.

[0050] The power battery voltage regulation method provided by the embodiments of this application can, without changing the circuit structure, when the battery voltage is less than the requested voltage, first control the power battery to charge the energy storage element, and then control the power battery and the energy storage element to charge the external charge-discharge device as a load together to realize step-up discharge.

[0051] In some embodiments, the switch module includes a charge-discharge switching module and a leg group connected in parallel; the voltage regulation switch assembly includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; controlling the voltage regulation switch assembly and the switch module to increase the charging voltage of the power battery for charging the external charge-discharge device specifically includes: in a first period, controlling the first switch, the second switch, all the upper legs of the leg group, and the second switching circuit of the charge-discharge switching module to conduct, and the third switch, the fourth switch, the fifth switch, all the lower legs of the leg group, and the first switching circuit of the charge-discharge switching module to disconnect; in a second period, controlling the first switch, the second switch, the fourth switch, the fifth switch, all the upper legs of the leg group, and the first switching circuit of the charge-discharge switching module to conduct, and the third switch, all the lower legs of the leg group, and the second switching circuit of the charge-discharge switching module to disconnect; wherein, the control of the first period and the control of the second period are continuously and alternately performed.

[0052] The embodiments provided in this application can flexibly adjust the output voltage according to the requirements of the load device without changing the circuit structure, and at the same time use the circuit structure of the power battery voltage regulation system itself to provide energy for the motor. It can realize the boost discharge of the power battery through the conduction and disconnection of different switches in the same circuit, so that the power battery voltage regulation system provides electrical energy for load devices whose required voltage is higher than the power battery voltage.

[0053] During the charging process of the power battery, through the alternate control of the first period and the second period, continuous discharge after boosting is realized to ensure the continuous progress of the discharge process.

[0054] In a fifth aspect, a power battery voltage regulation device of this application includes: 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 according to any one of the fourth aspect.

[0055] The power battery voltage regulation device provided by the embodiments of this application realizes the switching of different charge-discharge circuits through the voltage regulation switch assembly and the switch module in the power battery voltage regulation system, and further realizes flexible and efficient regulation of the charge-discharge voltage between the external charge-discharge device and the power battery under different charge-discharge requirements of the voltage regulation control signal. For example: in the same circuit structure, circuits for direct charging, boost charging, boost discharge, and buck discharge are respectively formed to meet the requirements of the charging voltage or discharge voltage of the power battery in different scenarios.

[0056] In a sixth aspect, a computer-readable storage medium of this application stores a computer program thereon; the computer program is executed by a processor to implement the power battery voltage regulation method according to any one of the fourth aspect.

[0057] The computer-readable storage medium provided by the embodiments of the present application realizes the switching of different charge and discharge circuits through the voltage regulation switch assembly and the switch module in the power battery voltage regulation system, and further realizes the flexible and efficient regulation of the charge and discharge voltage between the external charge and discharge device and the power battery under different charge and discharge demands of the voltage regulation control signal. For example, in the same circuit structure, circuits for direct charging, boost charging, boost discharging, and buck discharging are respectively formed to meet the requirements of the charging voltage or discharging voltage of the power battery in different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the drawings without creative efforts.

[0059] Figure 1 It is a schematic application architecture diagram of the charging method provided by the embodiments of the present application.

[0060] Figure 2 It is a circuit diagram of the power battery voltage regulation circuit provided by the embodiments of the present application.

[0061] Figure 3 It is a schematic block diagram of the electrical equipment provided by the embodiments of the present application.

[0062] Figure 4 It is a schematic block diagram of the power battery voltage regulation system provided by the embodiments of the present application.

[0063] Figure 5 It is a schematic flowchart of a control method for a power battery voltage regulation system provided by the embodiments of the present application.

[0064] Figure 6 It is a schematic flowchart of a control method for a power battery voltage regulation system provided by another embodiment of the present application.

[0065] Figure 7 、 8 And 9 are schematic diagrams of different charging circuits for charging the power battery by the power battery voltage regulation system provided by the embodiments of the present application.

[0066] Figure 10 It is a schematic flowchart of another control method for a power battery voltage regulation system provided by the embodiments of the present application.

[0067] Figure 11 It is a schematic flowchart of another control method for a power battery voltage regulation system provided by the embodiments of the present application.

[0068] Figure 12 , 13 Figures 14 and 14 are schematic diagrams of different charging circuits for charging an external load in a power battery voltage regulation system provided by an embodiment of the present application.

[0069] Figure 15 is a schematic flowchart of a control method for another power battery voltage regulation system provided by an embodiment of the present application.

[0070] Figure 16 is a schematic structural diagram of a power battery voltage regulation device provided by an embodiment of the present application.

[0071] In the drawings, the drawings are not drawn to actual scale. Detailed Embodiments

[0072] The following further describes in detail the embodiments of the present application in conjunction with the drawings and embodiments. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principle of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0073] In the description of the present application, it should be noted that unless otherwise specified, the meaning of "a plurality" is two or more; the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0074] The orientation words appearing in the following description are all the directions shown in the drawings, and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0075] With the development of battery technology, various performances of power batteries are constantly improving. In particular, the voltage of power batteries has generally increased significantly. For this new type of power battery with a relatively high voltage, only a charging device that can output a correspondingly high voltage can charge it. However, most of the currently used charging devices can only charge traditional power batteries with a relatively low voltage, and their maximum output voltage cannot reach the voltage required by the new type of power battery. If all the charging devices are replaced to adapt to the new type of power battery, it will lead to waste of the original charging devices and increase unnecessary costs at the same time.

[0076] In addition, with the research and development of various load devices (such as in-vehicle devices), the output voltages of power batteries required by different load devices are also different. Therefore, a method is needed to enable the power battery to more flexibly adjust its output voltage during the discharging process to meet the needs of different load devices.

[0077] In view of this, the embodiments of the present application provide a power battery voltage regulation system, its control method and control device. The power battery voltage regulation system includes a power battery, a switch module, a charge and discharge interface, and a motor. By controlling the conduction and disconnection of different switches in the switch module, direct 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 battery in the embodiments of the present application can be a lithium-ion battery, a lithium-metal battery, a lead-acid battery, a nickel-cadmium battery, a nickel-metal hydride battery, a lithium-sulfur battery, a lithium-air battery, or a sodium-ion battery, etc., which is not limited herein. In terms of scale, the battery in the embodiments of the present application can be a single cell, or a battery module or a battery pack, which is not limited herein. In terms of application scenarios, the battery can be applied in power devices such as automobiles and ships. For example, it can be applied in a power vehicle to supply power to the motor of the power vehicle and serve as the power source of the electric vehicle. The battery can also supply power to other electrical appliances in the electric vehicle, such as an in-vehicle air conditioner and an in-vehicle player.

[0079] For the convenience of description, the following will take the application of the power battery in a new energy vehicle (power vehicle) as an example for elaboration.

[0080] The drive motor and its control system are one of the core components of a new energy vehicle, and its drive characteristics determine the main performance indicators of the vehicle's driving. The motor drive system of a new energy vehicle mainly consists of an electric motor (i.e., a motor), a power converter, a motor controller (e.g., an inverter), various detection sensors, and a power source, etc. The motor is a rotating electromagnetic machine that operates based on the principle of electromagnetic induction and is used to convert electrical energy into mechanical energy. When operating, it absorbs electrical power from the electrical system and outputs mechanical power to the mechanical system.

[0081] Figure 1 FIG. 1 is a schematic diagram of an application architecture to which the method for charging according to an embodiment of the present application can be applied. The application architecture includes a Battery Management System (BMS) 100 and a charging pile 200. The BMS 100 can be connected to the charging pile 200 through a communication line to perform information interaction with the charging pile 200. For example, the communication line can be a Controller Area Network (CAN) communication line or a daisy chain communication line.

[0082] Among them, the BMS 100 is the BMS of the power battery, and the power battery is a battery that provides a power source for the electrical device. Optionally, the power battery can be a power storage battery. In terms of the type of battery, the power battery can be a lithium-ion battery, a lithium-metal battery, a lead-acid battery, a nickel-cadmium battery, a nickel-metal hydride battery, a lithium-sulfur battery, a lithium-air battery, or a sodium-ion battery, etc., which is not specifically limited in the embodiments of the present application. In terms of the battery scale, the power battery in the embodiments of the present application can be a battery cell / battery monomer, or a battery module or a battery pack, which is not specifically limited in the embodiments of the present application. Optionally, the electrical device can be a vehicle, a ship, a spacecraft, etc., which is not limited in the embodiments of the present application. The BMS is a control system for protecting the safe use of the power battery, and implements functions such as charge and discharge management, high-voltage control, battery protection, battery data acquisition, and battery state evaluation. Among them, the BMS can be integrated with the power battery in the same device / equipment, or the BMS can also be set as an independent device / equipment outside the power battery.

[0083] The charging pile 200, also known as a charger, is a device for charging the power battery. The charging pile can output a charging power according to the charging requirements of the BMS 100 to charge the power battery. For example, the charging pile 200 can output a voltage and a current according to the required voltage and required current sent by the BMS 100.

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

[0085] Figure 2 FIG. 2 is a schematic block diagram of a power battery voltage regulation circuit 10 provided by an embodiment of the present application.

[0086] As Figure 2 shown, the present application provides a power battery voltage regulation circuit 10, including a power battery 11, a heating module, a charge and discharge interface 13, and a voltage regulation switch assembly; the heating module includes an energy storage element and a switch module.

[0087] The power battery 11 is connected in parallel with the switch module; an external charge and discharge device is connected in parallel with the power battery 11 through the charge and discharge interface 13.

[0088] The voltage regulation switch assembly includes a plurality of switches, and the plurality of switches are arranged between the charging and discharging interface 13 and the power battery 11;

[0089] The voltage regulation 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 battery 11 in response to a voltage regulation control signal.

[0090] The power battery voltage regulation circuit provided by the embodiment of the present application realizes the switching of different charging and discharging circuits by controlling the voltage regulation switch assembly and the switch module, and further realizes the flexible and efficient adjustment of the charging and discharging voltage between the external charging and discharging device and the power battery 11 under different charging and discharging requirements of the voltage regulation control signal. For example: direct charging, boost charging, boost discharging, and buck discharging circuits are respectively formed in the same circuit structure to meet the charging voltage or discharging voltage requirements of the power battery 11 in different scenarios.

[0091] Specifically, 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 second switch K2 are respectively arranged on the positive electrode side and the negative electrode side of the power battery 11; the fourth switch K4 and the fifth switch K5 are respectively arranged on the positive electrode side and the negative electrode side of the charging and discharging interface 13; the third switch K3 is arranged between the positive electrode of the power battery 11 and the charging and discharging switching module 122.

[0092] Based on this, the power battery voltage regulation circuit in this embodiment fully considers the voltage regulation requirements during the charging and discharging of the power battery 11 in different situations, and switches are arranged at different positions in the charging and discharging circuit of the power battery 11 to achieve the purpose of switching different charging and discharging circuits.

[0093] At the same time, by controlling the conduction and disconnection of different switches in the voltage regulation switch assembly and the switch module, direct charging, boost charging, boost discharging, and buck discharging circuits can be respectively formed in the same circuit structure, so that the charging and discharging voltage of the power battery 11 can be flexibly adjusted without changing the circuit structure to meet the charging voltage or discharging voltage requirements of the power battery 11 in different scenarios.

[0094] Further specifically expanding the implementation manner, such as Figure 2 As shown, one end of the first switch K1 is connected to the positive electrode of the power battery 11, and the other end of the first switch K1 is connected to the first end of the switch module; one end of the second switch K2 is connected to the negative electrode of the power battery 11, and the other end of the second switch K2 is connected to the second end of the switch module.

[0095] The switch module includes a charge-discharge switching module 122 and a bridge arm group 121 connected in parallel. One end of the third switch K3 is connected in common line with all the upper bridge arms of the bridge arm group 121, and the other end of the third switch K3 is connected to the first end of the charge-discharge switching module 122; One end of the fourth switch K4 is connected to the positive pole of the charge-discharge interface 13, and the other end of the fourth switch K4 is connected to the first end of the charge-discharge switching module 122; One end of the fifth switch K5 is connected to the negative pole of the charge-discharge interface 13, and the other end of the fifth switch K5 is connected in common line with the second end of the charge-discharge switching module 122 and all the lower bridge arms of the bridge arm group 121.

[0096] Based on this, in this embodiment, switches are arranged at different positions in the charge-discharge circuit of the power battery 11 to achieve different purposes of charge-discharge circuit switching. Without changing the circuit structure, the output voltage can be flexibly adjusted according to the requirements of the load device. At the same time, the circuit structure of the power battery voltage regulation system itself is used to provide energy for the motor 14, and the boost discharge of the power battery 11 can be realized by the on and off of different switches in the same circuit.

[0097] In some embodiments, the switch module includes a charge-discharge switching module 122 and a bridge arm group 121 connected in parallel. The first end of the energy storage element is connected to the bridge arm group 121, and the second end of the energy storage element is connected to the charge-discharge switching module 122.

[0098] Based on this, in this embodiment of the power battery voltage regulation circuit, during charging and discharging under different charging and discharging requirements, energy storage and energy supply are carried out through the charge-discharge switching module 122 and the bridge arm group 121, ensuring the boost or buck of the charge-discharge voltage between the external charge-discharge device and the power battery 11.

[0099] Specifically, as Figure 2 shown, the energy storage element includes an M-phase motor 14, and windings 141, 142, and 143 connected to the M-phase motor 14.

[0100] Furthermore, the bridge arm group 121 includes M-phase bridge arms, where M is a positive integer; The M-phase windings of the M-phase motor 14 are respectively connected in one-to-one correspondence with the connection points of the upper and lower bridge arms of each phase of the M-phase bridge arms;

[0101] The charge-discharge switching module 122 includes a first switching circuit 1221 and a second switching circuit 1222 connected in series; The connection point of the first switching circuit 1221 and the second switching circuit 1222 is connected to the neutral point of the M-phase motor 14.

[0102] Based on this, the power battery voltage regulation circuit in this embodiment stores energy and provides energy during the charging and discharging processes through the charge-discharge switching module 122 and the arm group 121 under different charging and discharging requirements, ensuring step-up or step-down of the charging and discharging voltages between the external charging and discharging device and the power battery 11. The charge-discharge switching module 122 further ensures free switching of charging and discharging between the battery and the motor 14, between the motor 14 and the external device, and between the battery and the external device.

[0103] In some embodiments, as Figure 2 shown, both the first switching circuit 1221 and the second switching circuit 1222 include a triode and a freewheeling diode connected in parallel.

[0104] The power battery voltage regulation circuit provided by the embodiment of the present application improves the efficiency of free switching of charging and discharging of the charge-discharge switching module 122 between the battery and the motor 14, between the motor 14 and the external device, and between the battery and the external device through the triode and the freewheeling diode connected in parallel.

[0105] In other embodiments, both the first switching circuit 1221 and the second switching circuit 1222 include a triode or a relay switch.

[0106] Thus, the efficiency of free switching of charging and discharging of the charge-discharge switching module 122 between the battery and the motor 14, between the motor 14 and the external device, and between the battery and the external device is improved through the triode or the relay switch.

[0107] In other embodiments, not shown in the figure, the first switching circuit 1221 includes a diode, and the second switching circuit 1222 includes a switch; or, the first switching circuit 1221 includes a switch, and the second switching circuit 1222 includes a diode.

[0108] Thus, the efficiency of free switching of charging and discharging of the charge-discharge switching module 122 between the battery and the motor 14, between the motor 14 and the external device, and between the battery and the external device is improved through the free combination and parallel connection of the diode and the switch.

[0109] As Figure 2 shown, in some embodiments, a sixth switch K6 is provided between the connection points of the first switching circuit 1221 and the second switching circuit 1222 and the neutral point of the M-phase motor 14.

[0110] Thus, through the sixth switch K6, flexible switching between the first switching circuit 1221 and the second switching circuit 1222 in the charge-discharge switching module 122 and the neutral point of the motor 14 is achieved, ensuring free switching of charging and discharging.

[0111] As Figure 2As shown, in some embodiments, a first voltage stabilizing capacitor C1 is connected in parallel across both ends of the power battery 11, and a second voltage stabilizing capacitor C2 is connected in parallel across both ends of the charging and discharging interface 13.

[0112] Furthermore, through the first voltage stabilizing capacitor C1 and the second voltage stabilizing capacitor C2, the voltage at both ends of the power battery 11 or the charging and discharging interface 13 is ensured to be stable and continuous during the charging and discharging process.

[0113] As Figure 2 shown, in some embodiments, a branch is connected in parallel to the second switch K2, and the branch includes a resistor and a seventh switch K7 connected in series.

[0114] Thus, through the branch of the resistor and the seventh switch K7 connected in series, flexible cooperation with the second switch K2 is achieved, and further, the charging and discharging voltage between the external charging and discharging device and the power battery 11 is accurately adjusted.

[0115] In addition, please refer to Figure 2 for further description of the circuit as follows:

[0116] 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, and the control module controls the conduction or disconnection of these switches to form different circuits. The first switch K1 is used to conduct or disconnect the connection between the part of the power battery voltage regulation system 10 other than the power battery 11 and the battery positive electrode; the second switch K2 is used to conduct or disconnect the connection between the other part of the power battery voltage regulation system 10 other than the power battery 11 and the battery negative electrode; the third switch K3 is used to conduct or disconnect the connection between the charge and discharge switching module 122 and the charging and discharging interface 13, and the bridge arm group 121 and the power battery 11; the fourth switch K4 is used to conduct or disconnect the connection between the part of the power battery voltage regulation system 10 other than the charging and discharging interface 13 and the positive electrode of the charging and discharging interface 13; the fifth switch K5 is used to conduct or disconnect the connection between the part of the power battery voltage regulation system 10 other than the charging and discharging interface 13 and the negative electrode of the charging and discharging interface 13.

[0117] The arm group 121 and the charge-discharge switching module 122 can be implemented by an inverter in the motor 14 drive system, where the inverter can be implemented by the arm switches of Insulated Gate Bipolar Transistors (IGBTs). The number of arms in the arm group 121 is the same as the number of inductors in the motor 14. For example, if the motor 14 is a three-phase motor 14, the inverter includes three-phase arms, that is, it includes a U-phase arm, a V-phase arm, and a W-phase arm. Among them, each phase arm in the three-phase arms has an upper arm and a lower arm, and switch units are respectively arranged on the upper arm and the lower arm, that is, the arm group 121 respectively includes an upper arm switch 1211 and a lower arm switch 1212 in the U-phase arm, an upper arm switch 1213 and a lower arm switch 1214 in the V-phase arm, and an upper arm switch 1215 and a lower arm switch 1216 in the W-phase arm. The charge-discharge switching module 122 also has an upper arm and a lower arm, and switch units are respectively arranged on the upper arm and the lower arm, that is, the charge-discharge switching module 122 includes an upper arm switch 1221 and a lower arm switch 1222.

[0118] For the motor 14, multiple inductors can be included. Taking the three-phase motor 14 as an example, three inductors can be included, specifically including: an inductor 141 connected to the U-phase arm, an inductor 142 connected to the V-phase arm, and an inductor 143 connected to the W-phase arm. Among them, one end of the inductor 141 is connected to the connection point between the upper arm and the lower arm in the U-phase arm, one end of the inductor 142 is connected to the connection point between the upper arm and the lower arm in the V-phase arm, and one end of the inductor 143 is connected to the connection point between the upper arm and the lower arm in the W-phase arm. The other ends of the inductor 141, the inductor 142, and the inductor 143 are connected together, and this connection point is the three-phase center point of the motor 14.

[0119] It should be noted that the motor 14 is not limited to being a three-phase motor 14, and can also be a six-phase motor 14, etc. Correspondingly, the six-phase motor 14 can include six-phase arms.

[0120] Optionally, the power battery voltage regulation system 10 can also be provided with a sixth switch K6, a seventh switch K7, a first capacitor C1, a second capacitor C2, and a resistor R.

[0121] The sixth switch K6 is arranged between the three-phase center point of the motor 14 and the connection point between the upper arm and the lower arm of the charge-discharge switching module 122, and is used to cut off or conduct the high-voltage connection between the three-phase center point of the motor 14 and the connection point between the upper arm and the lower arm of the charge-discharge switching module 122. In the embodiment of the present application, the sixth switch K6 can always be in a closed state.

[0122] The seventh switch K7 is connected in series with a resistor R and then connected in parallel across both ends of the second switch K2. One end of the first capacitor C1 is connected to the positive electrode of the power battery 11 through the first switch K1, and the other end is connected to the negative electrode of the power battery 11 through the second switch K2. One end of the second capacitor C2 is connected to the positive electrode of the charging and discharging interface 13 through the fourth switch K4, and the other end is connected to the negative electrode of the charging and discharging interface 13 through the fifth switch K5. When performing high-voltage connection on the power battery voltage regulation system 10, the first switch K1 and the seventh switch K7 can be turned on first to pre-charge the first capacitor C1 and the second capacitor C2, avoiding damage to the circuit caused by a relatively high voltage. Specifically, a preset time can be set for the conduction of the seventh switch K7. After the preset time ends, the second switch K2 is turned on and the seventh switch K7 is turned off. In the embodiments of the present application, the seventh switch K7 can be turned on first within the preset time before the second switch K2 is turned on. After the preset time ends, the second switch K2 is turned on and the seventh switch K7 is turned off.

[0123] The second capacitor C2 is used to stabilize the input voltage of the charging and discharging interface 13 and absorb the spike voltage when the charging and discharging switching module 122 is disconnected, avoiding damage to the charging and discharging switching module 122. Both the first capacitor C1 and the second capacitor C2 can play roles such as voltage stabilization and filtering out of clutter.

[0124] The power battery voltage regulation system 10 provided by the embodiments of the present application fully considers the voltage regulation requirements during charging and discharging of the power battery 11 under different conditions. Switches are set at key points in the charging and discharging circuit of the power battery 11, and by controlling the conduction and disconnection of different switches, circuits for direct charging, boost charging, boost discharging, and buck discharging are respectively formed in the same circuit structure, so that the charging and discharging voltage of the power battery 11 can be flexibly adjusted without changing the circuit structure to meet the charging voltage or discharging voltage requirements of the power battery 11 in different scenarios.

[0125] Figure 3 It is a schematic block diagram of the electrical device 30 provided by the embodiments of the present application.

[0126] As Figure 3 shown, the electrical device 30 includes a control module 20 and a power battery voltage regulation circuit 10.

[0127] The control module is connected to the switch module and the voltage regulation switch assembly, and is used to control the voltage regulation switch assembly and the switch module to adjust the charging and discharging voltage between the external charging and discharging device and the power battery 11.

[0128] Optionally, the device for obtaining the battery voltage and the output voltage may be the BMS in the control module, and the device for controlling the on or off of the switch in the control switch module may be the micro control unit (MCU) in the control module or the motor controller. The BMS can compare the obtained battery voltage and output voltage, determine the charging method, and communicate with the MCU. For example, when the battery voltage is less than the output voltage, the BMS sends a first message to the MCU, and the first message is used to indicate that direct charging is used for charging. Then, the MCU can control the corresponding switch to be on or off according to the first message to form a direct charging loop.

[0129] Based on this, the electrical device provided in this embodiment realizes the switching of different charge and discharge loops through the control module and the power battery voltage regulation circuit, and further realizes the flexible and efficient regulation of the charge and discharge voltage between the external charge and discharge device and the power battery 11 under different charge and discharge requirements under the voltage regulation control signal. For example: in the same circuit structure, loops for direct charging, boost charging, boost discharging, and buck discharging are respectively formed to meet the requirements of the charge voltage or discharge voltage of the power battery 11 in different scenarios.

[0130] Figure 4 It is a schematic block diagram of the power battery voltage regulation system provided by the embodiment of the present application.

[0131] As Figure 4 shown, the present application provides a power battery voltage regulation system, including an external charge and discharge device 40 and an electrical device 30, and the external charge and discharge device 40 is connected to the charge and discharge interface 13 in the electrical device 30.

[0132] Based on this, the power battery voltage regulation system provided by the embodiment of the present application realizes the switching of different charge and discharge loops through the external charge and discharge device and the electrical device, and further realizes the flexible and efficient regulation of the charge and discharge voltage between the external charge and discharge device and the power battery 11 under different charge and discharge requirements under the voltage regulation control signal. For example: in the same circuit structure, loops for direct charging, boost charging, boost discharging, and buck discharging are respectively formed to meet the requirements of the charge voltage or discharge voltage of the power battery 11 in different scenarios.

[0133] Figure 5 It is a schematic flowchart of a control method for a power battery voltage regulation system provided by an embodiment of the present application.

[0134] As Figure 5 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:

[0135] S1: During the charging and discharging process between the external charging and discharging device and the electrical device, obtain the first voltage of the power battery 11 and the second voltage of the external charging and discharging device.

[0136] Then, according to the first voltage and the second voltage, control the voltage regulation switch assembly and the switch module to adjust the charging and discharging voltage between the external charging and discharging device and the power battery 11.

[0137] 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 assembly and the switch module in the power battery voltage regulation system. Furthermore, under different charging and discharging requirements of the voltage regulation control signal, it flexibly and efficiently adjusts the charging and discharging voltage between the external charging and discharging device and the power battery 11. For example: in the same circuit structure, circuits for direct charging, boost charging, boost discharging, and buck discharging are respectively formed to meet the requirements of the charging voltage or discharging voltage of the power battery 11 in different scenarios.

[0138] In one implementation scenario, the first voltage is the battery voltage of the power battery 11, and the second voltage is the output voltage of the external charging and discharging device.

[0139] When controlling the voltage regulation switch assembly and the switch module to adjust the charging and discharging voltage between the external charging and discharging device and the power battery 11 according to the first voltage and the second voltage, it specifically includes:

[0140] S11: When the battery voltage is less than the output voltage, control the voltage regulation switch assembly and the switch module to charge the power battery with the external charging and discharging device.

[0141] S12: When the battery voltage is greater than the output voltage, control the voltage regulation switch assembly and the switch module to increase the charging voltage of the external charging and discharging device to charge the power battery.

[0142] Based on the provided power battery voltage regulation method, the charging voltage of the power battery 11 can be flexibly adjusted according to the relationship between the voltage of the charging device and the power battery 11. At the same time, the circuit structure of the power battery voltage regulation system itself is used to provide energy for the motor 14, and boost charging of the power battery 11 can be achieved by turning on and off different switches in the same circuit. This enables the charging device to charge the power battery 11 with a voltage lower than the maximum output voltage of the charging device, and also charge the power battery 11 with a voltage higher than the maximum output voltage of the charging device. This control method can flexibly adjust the charging voltage of the power battery 11 in different scenarios, which can not only solve the compatibility problem of the external charging and discharging device, but also make the charging process of the power battery 11 not restricted by the maximum output voltage of the charging device.

[0143] Such asFigure 6 As shown, in the power battery voltage regulation method, step S11 specifically includes:

[0144] Control the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, and the fifth switch K5 to conduct, and all the bridge arms in the bridge arm group 121 and the charge and discharge switching module 122 are disconnected.

[0145] Figure 7 It is a schematic diagram of the charging circuit of the power battery voltage regulation system corresponding at this time.

[0146] As Figure 7 shown, a direct charging circuit for the power battery by the external charging device can be formed.

[0147] The power battery voltage regulation method provided by the embodiment of the present application can flexibly adjust the voltage output to the power battery 11 according to the different voltages of the charging device without changing the circuit structure, and at the same time use the circuit structure of the power battery voltage regulation system itself to provide energy for the motor 14, and can reduce the output voltage of the external charging and discharging device by the conduction and disconnection of different switches in the same circuit, so that the charging device can charge the power battery 11 whose battery voltage is lower than the maximum output voltage of the charging device.

[0148] In the power battery voltage regulation method, step S12 specifically includes: in the first time period, controlling the external charging and discharging device to charge the energy storage element; 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 control the external charging and discharging device to charge the energy storage element, and then control the external charging and discharging device and the energy storage element to charge the power battery together to achieve step-up continuous charging.

[0149] As Figure 6 shown, S121: In the first time period, control the fourth switch K4, the fifth switch K5, all the lower bridge arms of the bridge arm group 121, and the first switching circuit 1221 of the charge and discharge switching module 122 to conduct, and the first switch K1, the second switch K2, the third switch K3, all the upper bridge arms of the bridge arm group 121, and the second switching circuit 1222 of the charge and discharge switching module 122 to disconnect.

[0150] Figure 8 It is a schematic diagram of the charging circuit of the power battery voltage regulation system corresponding at this time.

[0151] As Figure 8 shown, at this time, the external charging device is conducted with the motor inductor through the charge and discharge interface, and the motor inductor stores energy. The charging device only provides electrical energy for the motor 14, and the motor 14 stores energy through its own inductor.

[0152] S122: In the second time period, control the first switch K1, the second switch K2, the fourth switch K4, the fifth switch K5, all upper bridge arms of the bridge arm group 121, and the first switching circuit 1221 of the charge and discharge switching module 122 to conduct, and turn off the third switch K3, all lower bridge arms of the bridge arm group 121, and the second switching circuit 1222 of the charge and discharge switching module 122.

[0153] Figure 9 It is a schematic diagram of the charging circuit of the power battery voltage regulation system corresponding at this time.

[0154] As Figure 9 shown, at this time, the external charging pile is connected to the battery through the charge and discharge interface and the motor inductor, and the inductor and the external charging pile jointly charge the battery.

[0155] The charging device and the motor 14 pre-storing energy jointly provide electric energy for the power battery 11. That is to say, the voltage provided by the charging device is superimposed on the voltage provided by the motor 14, and the superimposed voltage is greater than the voltage of the power battery 11, then the power battery 11 can be charged. The motor 14 can pre-store energy through the circuit in the power battery voltage regulation system 10, or the external device can provide energy for the motor 14.

[0156] Finally, continuously alternate the control of the first time period and the control of the second time period. During the charging process of the power battery 11, through the alternating control of the first time period and the second time period, while realizing the boost, continuous charging is achieved to ensure the continuous progress of the charging process.

[0157] Based on the embodiments provided by this embodiment, the voltage output to the power battery 11 can be flexibly adjusted according to the 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 for the motor 14. It is possible to increase the output voltage of the external charge and discharge device by turning on and off different switches in the same circuit, so that the charging device can charge the power battery 11 whose battery voltage is higher than the maximum output voltage of the charging device.

[0158] In another implementation scenario, the first voltage is the output voltage of the power battery 11, and the second voltage is the requested voltage of the external charge and discharge device as a load.

[0159] Figure 10 It is a schematic flowchart of another control method of the power battery voltage regulation system provided by the embodiment of the present application.

[0160] As Figure 10 shown, according to the first voltage and the second voltage, controlling the voltage regulation switch assembly and the switch module to adjust the charge and discharge voltage between the external charge and discharge device and the power battery 11 specifically includes:

[0161] S2: During the charging and discharging process between the external charging and discharging device and the electrical device, obtain the battery voltage of the power battery 11, i.e., the first voltage; the external charging and discharging device serves as a load, and obtain the requested voltage of the external charging and discharging device, i.e., the second voltage.

[0162] Then, based on the battery voltage and the requested voltage, control the voltage regulation switch assembly and the switch module to adjust the charging and discharging voltage between the external charging and discharging device and the power battery 11.

[0163] Based on this, the control method of the power battery voltage regulation system in this embodiment can, in different situations, by controlling the voltage regulation switch assembly and the switch module, adapt to various load devices with different required voltages without changing the circuit structure, so that the power battery voltage regulation system can not only provide electrical energy for load devices whose required voltage is higher than the voltage of the power battery 11, but also provide electrical energy for load devices whose required voltage is lower than the voltage of the power battery 11, thereby realizing flexible adjustment of the discharge voltage of the power battery 11 in different scenarios and providing electrical energy for a variety of load devices.

[0164] Specifically, based on the battery voltage and the requested voltage, controlling the voltage regulation switch assembly and the switch module to adjust the charging and discharging voltage between the external charging and discharging device and the power battery 11 specifically includes:

[0165] S21: When the output voltage of the power battery is greater than the requested voltage of the load, control the voltage regulation switch assembly and the switch module to reduce the charging voltage of the power battery 11 charging the external charging and discharging device.

[0166] S22: When the output voltage of the power battery is less than the requested voltage of the load, control the voltage regulation switch assembly and the switch module to increase the charging voltage of the power battery 11 charging the external charging and discharging device.

[0167] In different situations, by controlling the voltage regulation switch assembly and the switch module, the power battery voltage regulation system can not only provide electrical energy for load devices whose required voltage is higher than the voltage of the power battery 11, but also provide electrical energy for load devices whose required voltage is lower than the voltage of the power battery 11, thereby realizing flexible adjustment of the discharge voltage of the power battery 11 in different scenarios and providing electrical energy for a variety of load devices.

[0168] In the power battery voltage regulation method, when the output voltage of the power battery is greater than the requested voltage of the load, step S21 specifically includes: in the first period, control the power battery to charge the energy storage element; in the second period, control the energy storage element to charge the external charging and discharging device serving as a load. Without changing the circuit structure, when the battery voltage is greater than the output voltage, first control the power battery to charge the energy storage element, and control the energy storage element to charge the external charging and discharging device serving as a load to achieve step-down discharge.

[0169] As shown Figure 11 in FIG. 1, S211: In the first time period, the first switch K1, the second switch K2, all the upper bridge arms of the bridge arm group 121, and the second switching circuit 1222 of the charge and discharge switching module 122 are turned on, and the third switch K3, the fourth switch K4, the fifth switch K5, all the lower bridge arms of the bridge arm group 121, and the first switching circuit 1221 of the charge and discharge switching module 122 are turned off.

[0170] Figure 12 FIG. 2 is a schematic diagram of the charging circuit of the power battery voltage regulation system corresponding at this time.

[0171] As shown Figure 12 in FIG. 3, at this time, the battery energy is used to store energy in the motor inductor. The power battery 11 only supplies electrical energy to the motor 14, and the motor 14 stores energy through its own inductor.

[0172] S212: In the second time period, control the fourth switch K4, the fifth switch K5, all the lower bridge arms of the bridge arm group 121, and the first switching circuit 1221 of the charge and discharge switching module 122 to be turned on, and the first switch K1, the second switch K2, the third switch K3, all the upper bridge arms of the bridge arm group 121, and the second switching circuit 1222 of the charge and discharge switching module 122 to be turned off.

[0173] Figure 13 FIG. 4 is a schematic diagram of the charging circuit of the power battery voltage regulation system corresponding at this time.

[0174] As shown Figure 13 in FIG. 5, at this time, the charging voltage for charging the load is reduced, and the motor inductor is used as a power source to output electric energy to the external load.

[0175] In the circuit formed by step-down charging, only the motor 14 that has pre-stored energy supplies electrical energy to the load device. Among them, the energy pre-stored in the motor 14 can be provided by the circuit of the power battery voltage regulation system 10 itself.

[0176] Finally, the control of the first time period and the control of the second time period are continuously alternated. During the charging process of the power battery 11, through the alternating control of the first time period and the second time period, continuous discharge after step-down is achieved, ensuring the continuous progress of the discharge process.

[0177] In summary, without changing the circuit structure, the output voltage can be flexibly adjusted according to the needs of the load device. At the same time, the circuit structure of the power battery voltage regulation system itself is used to provide energy for the motor 14. The step-down discharge of the power battery 11 can be realized by the on and off of different switches in the same circuit, so that the power battery voltage regulation system can provide electrical energy for the load device whose required voltage is lower than the voltage of the power battery 11.

[0178] In the power battery voltage regulation method, step S22 specifically 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 together to charge an external charging and discharging device as a load. Without changing the circuit structure, when the battery voltage is less than the requested voltage, the power battery can be first controlled to charge the energy storage element, and then the power battery and the energy storage element can be controlled together to charge an external charging and discharging device as a load, so as to realize boost discharge.

[0179] As Figure 11 shown, S221: In the first time period, control the first switch K1, the second switch K2, all the upper bridge arms of the bridge arm group 121, and the second switching circuit 1222 of the charge and discharge switching module 122 to conduct, and disconnect the third switch K3, the fourth switch K4, the fifth switch K5, all the lower bridge arms of the bridge arm group 121, and the first switching circuit 1221 of the charge and discharge switching module 122.

[0180] Figure 12 It is a schematic diagram of the charging circuit of the power battery voltage regulation system corresponding at this time.

[0181] As Figure 12 shown, at this time, the battery energy is used to store energy in the motor inductor. The power battery 11 only supplies electrical energy to the motor 14, and the motor 14 stores energy through its own inductor.

[0182] S222: In the second time period, control the first switch K1, the second switch K2, the fourth switch K4, the fifth switch K5, all the upper bridge arms of the bridge arm group 121, and the first switching circuit 1221 of the charge and discharge switching module 122 to conduct, and disconnect the third switch K3, all the lower bridge arms of the bridge arm group 121, and the second switching circuit 1222 of the charge and discharge switching module 122.

[0183] Figure 14 It is a schematic diagram of the charging circuit of the power battery voltage regulation system corresponding at this time.

[0184] As Figure 14 shown, at this time, the charging voltage for charging the load is increased, and the power battery and the motor inductor are used as power sources to output electric energy to the external load.

[0185] The power battery 11 and the motor 14 that has pre-stored energy jointly provide electrical energy for the load device. That is to say, the voltage provided by the power battery 11 is superimposed on the voltage provided by the motor 14, and the superimposed voltage can match the requested voltage of the load device, so as to provide electrical energy for the load device.

[0186] Finally, continuously alternate between controlling the first period and the second period. During the charging process of the power battery 11, through the alternating control of the first period and the second period, continuous discharge after boosting is achieved to ensure the continuous progress of the discharge process.

[0187] The embodiment provided by the present application can flexibly adjust the output voltage according to the requirements of the load 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 for the motor 14. It is possible to achieve boosting and discharging of the power battery 11 through the conduction and disconnection of different switches in the same circuit, so that the power battery voltage regulation system provides electrical energy for load devices whose required voltage is higher than the voltage of the power battery 11.

[0188] Figure 15 It is a schematic flowchart of another control method for the power battery voltage regulation system provided by the embodiment of the present application.

[0189] In another preferred embodiment, during the charging process of the power battery as a power source for an external load, whether discharging or charging, it is necessary to go through step S211 or S221, and these are the same steps, and it is necessary to first store energy for the motor inductor through the power battery.

[0190] Therefore, as Figure 15 shown, first perform step S211 or S221, that is, in the first period, the first switch K1, the second switch K2, all the upper bridge arms of the bridge arm group 121, and the second switching circuit 1222 of the charge and discharge switching module 122 are turned on, and the third switch K3, the fourth switch K4, the fifth switch K5, all the lower bridge arms of the bridge arm group 121, and the first switching circuit 1221 of the charge and discharge switching module 122 are turned off.

[0191] According to boosting or bucking, perform S212 or S222. This will not be elaborated here, please refer to the foregoing solution content.

[0192] Figure 16 shows a schematic structural diagram of a power battery voltage regulation device 400 according to an embodiment of the present application.

[0193] As Figure 16 shown, the power battery voltage regulation device 400 includes:

[0194] A memory 402: for storing executable instructions; and

[0195] A processor 401: for connecting to the memory 402 to execute executable instructions so as to complete the motion vector prediction method.

[0196] Those skilled in the art can understand, schematically Figure 16It is only an example of the power battery voltage regulation device 400, which does not constitute a limitation on the power battery voltage regulation device 400. It may include more or fewer components than those shown in the figure, or combine some components, or different components. For example, the power battery voltage regulation device 400 may also include input / output devices, network access devices, buses, etc.

[0197] The so-called processor 401 (Central Processing Unit, CPU) may also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor 401 may also be any conventional processor, etc. The processor 401 is the control center of the power battery voltage regulation device 400, and connects various parts of the entire power battery voltage regulation device 400 through various interfaces and lines.

[0198] The memory 402 can be used to store computer-readable instructions. The processor 401 realizes various functions of the power battery voltage regulation device 400 by running or executing the computer-readable instructions or modules stored in the memory 402, and by calling the data stored in the memory 402. The memory 402 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created according to the use of the power battery voltage regulation device 400. In addition, the memory 402 may include a hard disk, memory, plug-in hard disk, smart media card (Smart Media Card, SMC), secure digital (Secure Digital, SD) card, flash card (Flash Card), at least one magnetic disk storage device, flash device, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM) or other non-volatile / volatile storage devices.

[0199] When the modules integrated in the power battery voltage regulation device 400 are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, to implement all or part of the processes in the above-described embodiment methods of the present invention, computer-readable instructions can also be used to instruct relevant hardware to complete. The computer-readable instructions can be stored in a computer-readable storage medium. When the computer-readable instructions are executed by a processor, the steps of the above-described various method embodiments can be implemented.

[0200] The power battery voltage regulation device provided by the embodiments of the present application realizes the switching of different charge and discharge circuits through the voltage regulation switch assembly and the switch module in the power battery voltage regulation system, and further realizes the flexible and efficient regulation of the charge and discharge voltage between the external charge and discharge device and the power battery 11 under different charge and discharge requirements of the voltage regulation control signal. For example: in the same circuit structure, circuits for direct charging, boost charging, boost discharging, and buck discharging are respectively formed to meet the requirements of the charging voltage or discharging voltage of the power battery 11 in different scenarios.

[0201] Finally, the present application also provides a computer-readable storage medium, on which a computer program is stored; the computer program is executed by a processor to implement the power battery voltage regulation method.

[0202] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0203] Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments and will not be repeated here.

[0204] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling, direct coupling, or communication connection can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be in an electrical, mechanical, or other form.

[0205] The unit described as a separation component may or may not be physically separated. The component displayed as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0206] In addition, each functional unit in various embodiments of the present application may be integrated in a processing unit, may exist separately as individual physical units, or two or more units may be integrated in one unit.

[0207] If the above-mentioned function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this 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 for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0208] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, and all of them should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A power battery voltage regulation circuit, characterized in that, it includes a power battery, a heating module, a charge and discharge interface, and a voltage regulation switch assembly; the heating module includes an energy storage element and a switch module; the power battery is connected in parallel with the switch module; an external charge and discharge device is connected in parallel with the power battery through the charge and discharge interface; the voltage regulation switch assembly includes a plurality of switches, and the plurality of switches are arranged between the charge and discharge interface and the power battery; the voltage regulation switch assembly and the switch module are used to adjust the charge and discharge voltage between the external charge and discharge device and the power battery in response to a voltage regulation control signal; the voltage regulation switch assembly includes a first switch and a second switch; the first switch and the second switch are respectively arranged on the positive electrode side and the negative electrode side of the power battery; one end of the first switch is connected to the positive electrode of the power battery, and the other end of the first switch is connected to the first end of the switch module; one end of the second switch is connected to the negative electrode of the power battery, and the other end of the second switch is connected to the second end of the switch module; the voltage regulation switch assembly further includes a third switch, a fourth switch, and a fifth switch; the fourth switch and the fifth switch are respectively arranged on the positive electrode side and the negative electrode side of the charge and discharge interface; the third switch is arranged between the positive electrode of the power battery and the charge and discharge interface; the energy storage element includes an M-phase motor; the charge and discharge switching module of the switch module includes a first switching circuit and a second switching circuit connected in series; a sixth switch is arranged between the connection point of the first switching circuit and the second switching circuit and the neutral point of the M-phase motor.

2. The regulation circuit according to claim 1, characterized in that, the switch module includes a charge and discharge switching module and a bridge arm group connected in parallel, one end of the third switch is connected in common with all the upper bridge arms of the bridge arm group, and the other end of the third switch is connected to the first end of the charge and discharge switching module; one end of the fourth switch is connected to the positive electrode of the charge and discharge interface, and the other end of the fourth switch is connected to the first end of the charge and discharge switching module; one end of the fifth switch is connected to the negative electrode of the charge and discharge interface, and the other end of the fifth switch is connected in common with the second end of the charge and discharge switching module and all the lower bridge arms of the bridge arm group.

3. The regulation circuit according to claim 1, characterized in that, the switch module includes a charge and discharge switching module and a bridge arm group connected in parallel, the first end of the energy storage element is connected to the bridge arm group, and the second end of the energy storage element is connected to the charge and discharge switching module.

4. The regulation circuit according to claim 3, characterized in that, the bridge arm group includes M-phase bridge arms, where M is a positive integer; the M-phase windings of the M-phase motor are respectively connected in one-to-one correspondence with the connection points of the upper and lower bridge arms of each phase of the M-phase bridge arms; the connection point of the first switching circuit and the second switching circuit is connected to the neutral point of the M-phase motor.

5. The regulation circuit according to claim 4, characterized in that, Both the first switching circuit and the second switching circuit include a triode and a freewheeling diode connected in parallel.

6. The regulating circuit according to claim 4, wherein, both the first switching circuit and the second switching circuit include a triode or a relay switch.

7. The regulating circuit according to claim 4, 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.

8. The regulating circuit according to any one of claims 1 to 7, wherein, a first voltage stabilizing capacitor is connected in parallel across both ends of the power battery, and a second voltage stabilizing capacitor is connected in parallel across both ends of the charging and discharging interface.

9. The regulating circuit according to any one of claims 1 to 7, wherein, a branch is connected in parallel to the second switch, and the branch includes a resistor and a seventh switch connected in series.

10. An electrical device, wherein, it includes a control module and a power battery voltage regulating circuit according to any one of claims 1 - 9; The control module is connected to the switch module and the voltage regulating switch assembly, and is used to control the voltage regulating switch assembly and the switch module to regulate the charging and discharging voltage between the external charging and discharging device and the power battery.

11. A power battery voltage regulating system includes an external charging and discharging device and the electrical device according to claim 10, and the external charging and discharging device is connected to the charging and discharging interface in the electrical device.

12. A power battery voltage regulating method, wherein, applied to the power battery voltage regulating system according to claim 11, includes: acquiring a first voltage of the power battery and acquiring a second voltage of the external charging and discharging device; According to the first voltage and the second voltage, controlling the voltage regulating switch assembly and the switch module to regulate the charging and discharging voltage between the external charging and discharging device and the power battery.

13. The power battery voltage regulating method according to claim 12, wherein, the first voltage is the battery voltage of the power battery, 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 battery, and the second voltage is the requested voltage of the external charging and discharging device as a load.

14. The power battery voltage regulating method according to claim 13, wherein, the step of controlling the voltage regulating switch assembly and the switch module to regulate the charging and discharging voltage between the external charging and discharging device and the power battery according to the first voltage and the second voltage specifically includes: when the battery voltage is less than the output voltage, controlling the voltage regulating switch assembly and the switch module to charge the power battery by the external charging and discharging device; when the battery voltage is greater than the output voltage, controlling the voltage regulating switch assembly and the switch module to increase the charging voltage of the external charging and discharging device charging the power battery.

15. The power battery voltage regulating method according to claim 14, wherein, The switch module includes a charge-discharge switching module and a leg group connected in parallel; the voltage regulation switch assembly includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; Controlling the voltage regulation switch assembly and the switch module to charge the power battery with the external charge-discharge device specifically includes: Controlling the first switch, the second switch, the third switch, the fourth switch, and the fifth switch to conduct, and all legs in the leg group and the charge-discharge switching module are disconnected.

16. The method for regulating the voltage of a power battery according to claim 14, wherein, Controlling the voltage regulation switch assembly and the switch module to increase the charging voltage of the external charge-discharge device for charging the power battery specifically includes: In the first time period, controlling the external charge-discharge device to charge the energy storage element; In the second time period, controlling the external charge-discharge device and the energy storage element to charge the power battery together.

17. The method for regulating the voltage of a power battery according to claim 14 or 16, wherein, The switch module includes a charge-discharge switching module and a leg group connected in parallel; the voltage regulation switch assembly includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; Controlling the voltage regulation switch assembly and the switch module to increase the charging voltage of the external charge-discharge device for charging the power battery specifically includes: In the first time period, controlling the fourth switch, the fifth switch, all the lower legs of the leg group, and the first switching circuit of the charge-discharge switching module to conduct, and the first switch, the second switch, the third switch, all the upper legs of the leg group, and the second switching circuit of the charge-discharge switching module to be disconnected; In the second time period, controlling the first switch, the second switch, the fourth switch, the fifth switch, all the upper legs of the leg group, and the first switching circuit of the charge-discharge switching module to conduct, and the third switch, all the lower legs of the leg group, and the second switching circuit of the charge-discharge switching module to be disconnected; wherein, the control of the first time period and the control of the second time period are continuously alternated.

18. The method for regulating the voltage of a power battery according to claim 13, wherein, Controlling the voltage regulation switch assembly and the switch module to regulate the charge-discharge voltage between the external charge-discharge device and the power battery according to the first voltage and the second voltage specifically includes: When the output voltage is greater than the requested voltage, controlling the voltage regulation switch assembly and the switch module to reduce the charging voltage of the power battery for charging the external charge-discharge device; When the output voltage is less than the requested voltage, controlling the voltage regulation switch assembly and the switch module to increase the charging voltage of the power battery for charging the external charge-discharge device.

19. The method for regulating the voltage of a power battery according to claim 18, wherein, Controlling the voltage regulation switch assembly and the switch module to reduce the charging voltage of the power battery for charging the external charging and discharging device, specifically including: In the first period, controlling the power battery to charge the energy storage element; In the second period, controlling the energy storage element to charge the external charging and discharging device serving as a load.

20. The method for regulating the voltage of a power battery according to claim 18 or 19, wherein, The switch module includes a charge-discharge switching module and a leg group connected in parallel; the voltage regulation switch assembly includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; controlling the voltage regulation switch assembly and the switch module to reduce the charging voltage of the power battery for charging the external charging and discharging device, specifically including: In the first period, the first switch, the second switch, all the upper legs of the leg group, and the second switching circuit of the charge-discharge switching module are turned on, and the third switch, the fourth switch, the fifth switch, all the lower legs of the leg group, and the first switching circuit of the charge-discharge switching module are turned off; In the second period, controlling the fourth switch, the fifth switch, all the lower legs of the leg group, and the first switching circuit of the charge-discharge switching module to be turned on, and the first switch, the second switch, the third switch, all the upper legs of the leg group, and the second switching circuit of the charge-discharge switching module to be turned off; wherein, the control of the first period and the control of the second period are continuously alternated.

21. The method for regulating the voltage of a power battery according to claim 18, wherein, Controlling the voltage regulation switch assembly and the switch module to increase the charging voltage of the power battery for charging the external charging and discharging device, specifically including: In the first period, controlling the power battery to charge the energy storage element; In the second period, controlling the power battery and the energy storage element together to charge the external charging and discharging device serving as a load.

22. The method for regulating the voltage of a power battery according to claim 18 or 21, wherein, The switch module includes a charge-discharge switching module and a leg group connected in parallel; the voltage regulation switch assembly includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; controlling the voltage regulation switch assembly and the switch module to increase the charging voltage of the power battery for charging the external charging and discharging device, specifically including: In the first period, controlling the first switch, the second switch, all the upper legs of the leg group, and the second switching circuit of the charge-discharge switching module to be turned on, and the third switch, the fourth switch, the fifth switch, all the lower legs of the leg group, and the first switching circuit of the charge-discharge switching module to be turned off; In the second time period, control the first switch, the second switch, the fourth switch, the fifth switch, all the upper bridge arms of the bridge arm group and the first switching circuit of the charge and discharge switching module to conduct, and disconnect the third switch, all the lower bridge arms of the bridge arm group and the second switching circuit of the charge and discharge switching module; Among them, the control of the first time period and the control of the second time period are continuously alternated.

23. A power battery voltage regulation device, Characterized in that, Comprising: A memory: for storing executable instructions; and A processor: for connecting to the memory to execute the executable instructions so as to complete the power battery voltage regulation method according to any one of claims 12-22.

24. A computer-readable storage medium, Characterized in that, A computer program is stored thereon; the computer program is executed by a processor to implement the power battery voltage regulation method according to any one of claims 12-22.

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