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

Abstract

A power battery voltage regulating system and a control method and a control device thereof, the control method comprising: acquiring a first voltage and a second voltage, the first voltage being a voltage of the power battery, and the second voltage being a maximum output voltage of a charging device, the charging device being used for connecting a charge-discharge interface; when the first voltage is less than the second voltage, controlling the first switch, the second switch, the third switch, the fourth switch and the fifth switch to be conductive, and all the bridges in the first bridge group and the second bridge group to be disconnected; or when the first voltage is greater than or equal to the second voltage, controlling the first switch, the second switch, the fourth switch, the fifth switch, an upper bridge of the first bridge group and an upper bridge of the second bridge to be conductive, and the third switch, a lower bridge of the first bridge group and a lower bridge of the second bridge to be disconnected.

Description

Technical Field

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

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

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

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

[0005] In a first aspect, this application provides a control method for a power battery voltage regulation system. The power battery voltage regulation system includes a power battery, a switching module, a charging / discharging interface, and a motor. The switching module includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a first bridge arm group, and a second bridge arm. Each bridge arm in the first bridge arm group and the second bridge arm includes an upper bridge arm and a lower bridge arm. The connection points of the upper and lower bridge arms of each bridge arm in the first bridge arm group are connected one-to-one with all the inductors in the motor. The connection points of the upper and lower bridge arms of the second bridge arm are connected with the three-phase center point of the motor. One end of the first switch is connected to the positive terminal of the power battery. The other end of the first switch is connected to one end of the third switch and is connected to all the inductors in the motor through the upper bridge arm of the first bridge arm group. The other end of the third switch is connected to one end of the fourth switch and is connected to the three-phase center point of the motor through the upper bridge arm of the second bridge arm. The other end of the fourth switch is connected to the positive terminal of the charging / discharging interface. One end of the first switch is connected to the negative terminal of the power battery, the other end of the second switch is connected to one end of the fifth switch, and is connected to all the inductors in the motor through the lower arm of the first bridge arm group, and is connected to the three-phase center point of the motor through the lower arm of the second bridge arm, and the other end of the fifth switch is connected to the negative terminal of the charging and discharging interface; the control method includes: acquiring a first voltage and a second voltage, the first voltage being the voltage of the power battery, the second voltage being the maximum output voltage of the charging device, the charging device being used to connect to the charging and discharging interface; when the first voltage is less than the second voltage, controlling the first switch, the second switch, the third switch, the fourth switch and the fifth switch to be turned on, and all bridge arms in the first bridge arm group and the second bridge arm to be turned off; or, when the first voltage is greater than or equal to the second voltage, controlling the first switch, the second switch, the fourth switch, the fifth switch, the upper arm of the first bridge arm group and the upper arm of the second bridge arm to be turned on, and the third switch, the lower arm of the first bridge arm group and the lower arm of the second bridge arm to be turned off.

[0006] The control method for the power battery voltage regulation system provided in this application embodiment can, under different conditions, enable the charging device to charge power batteries with voltages lower than the maximum output voltage of the charging device, as well as power batteries with voltages higher than the maximum output voltage of the charging device, without changing the existing charging facilities, by controlling the on and off of different switches in the control circuit structure. This control method can flexibly adjust the charging voltage of the power battery in different scenarios, solving the compatibility problem of external charging devices and ensuring that the charging process of the power battery is not limited by the maximum output voltage of the charging device.

[0007] In some embodiments, when the first voltage is greater than or equal to the second voltage, the control method further includes: controlling the fourth switch, the fifth switch, the lower bridge arm of the first bridge arm group, and the upper bridge arm of the second bridge arm to be turned on during a first time period, and the third switch, the upper bridge arm of the first bridge arm group, and the lower bridge arm of the second bridge arm to be turned off; controlling the first switch, the second switch, the fourth switch, the fifth switch, the upper bridge arm of the first bridge arm group, and the upper bridge arm of the second bridge arm to be turned on, and the third switch, the lower bridge arm of the first bridge arm group, and the lower bridge arm of the second bridge arm to be turned off during a second time period, including: controlling the first switch, the second switch, the fourth switch, the fifth switch, the upper bridge arm of the first bridge arm group, and the upper bridge arm of the second bridge arm to be turned on during a second time period, and the third switch, the lower bridge arm of the first bridge arm group, and the lower bridge arm of the second bridge arm to be turned off; wherein, the first time period and the second time period constitute a first cycle, and within the first cycle, the first time period precedes the second time period.

[0008] The embodiments provided in this application can flexibly adjust the charging voltage of the power battery according to the relationship between the voltage of the charging device and the power battery without changing the circuit structure. At the same time, the power battery voltage regulation system itself provides energy to the motor by utilizing its own circuit structure. The power battery can be boosted and charged by turning on and off different switches in the same circuit.

[0009] In some embodiments, the first time period and the second time period are distributed alternately.

[0010] During the charging process of the power battery, by alternating between the first and second time periods, continuous charging after voltage boost can be achieved, ensuring the continuous charging process.

[0011] Secondly, this application provides a control method for a power battery voltage regulation system. The power battery voltage regulation system includes a power battery, a switching module, a charging / discharging interface, and a motor. The switching module includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a first bridge arm group, and a second bridge arm. Each bridge arm in the first bridge arm group and the second bridge arm includes an upper bridge arm and a lower bridge arm. The connection points of the upper and lower bridge arms of each bridge arm in the first bridge arm group are connected one-to-one with all the inductors in the motor. The connection points of the upper and lower bridge arms of the second bridge arm are connected with the three-phase center point of the motor. One end of the first switch is connected to the positive terminal of the power battery. The other end of the first switch is connected to one end of the third switch and is connected to all the inductors in the motor through the upper bridge arm of the first bridge arm group. The other end of the third switch is connected to one end of the fourth switch and is connected to the three-phase center point of the motor through the upper bridge arm of the second bridge arm. The other end of the fourth switch is connected to the positive terminal of the charging / discharging interface. One end of the second switch is connected to the power battery. The negative terminal of the battery is connected, the other end of the second switch is connected to one end of the fifth switch, and is connected to all the inductors in the motor through the lower arm of the first bridge arm group, and connected to the three-phase center point of the motor through the lower arm of the second bridge arm, and the other end of the fifth switch is connected to the negative terminal of the charging and discharging interface; the control method includes: acquiring a first voltage and a third voltage, the first voltage being the voltage of the power battery, the third voltage being the requested voltage of the load device, the load device being used to connect to the charging and discharging interface; when the first voltage is greater than the third voltage, controlling the fourth switch, the fifth switch, the lower arm of the first bridge arm group and the upper arm of the second bridge arm to be turned on, and the third switch, the upper arm of the first bridge arm group and the lower arm of the second bridge arm to be turned off; or, when the first voltage is less than the third voltage, controlling the first switch, the second switch, the fourth switch, the fifth switch, the upper arm of the first bridge arm group and the upper arm of the second bridge arm to be turned on, and the third switch, the lower arm of the first bridge arm group and the lower arm of the second bridge arm to be turned off.

[0012] The control method of the power battery voltage regulation system provided in this application embodiment can adapt to various load devices with different voltage requirements under different conditions by controlling the on and off of different switches in the control circuit structure without changing the circuit structure. This allows the power battery voltage regulation system to provide power to load devices with a voltage requirement higher than the power battery voltage, as well as load devices with a voltage requirement lower than the power battery voltage. This enables flexible adjustment of the power battery discharge voltage in different scenarios to provide power to various load devices.

[0013] In some embodiments, the control method further includes: controlling the first switch, the second switch, the upper arm of the first bridge arm group, and the lower arm of the second bridge arm to be turned on during a third time period, and the third switch, the lower arm of the first bridge arm group, and the upper arm of the second bridge arm to be turned off; the step of controlling the fourth switch, the fifth switch, the lower arm of the first bridge arm group, and the upper arm of the second bridge arm to be turned on, and the third switch, the upper arm of the first bridge arm group, and the lower arm of the second bridge arm to be turned off during a fourth time period when the first voltage is greater than the third voltage, and the third switch, the upper arm of the first bridge arm group, and the lower arm of the second bridge arm to be turned off during a fourth time period; wherein the third time period and the fourth time period constitute a second cycle, and the third time period precedes the fourth time period within the second cycle.

[0014] The embodiments provided in this application can flexibly adjust the output voltage according to the needs of the load device without changing the circuit structure. At the same time, the power battery voltage regulation system itself provides energy to the motor, and the power battery can be de-voltage discharged by turning on and off different switches in the same circuit.

[0015] In some embodiments, the control method further includes: controlling the first switch, the second switch, the upper arm of the first bridge arm group, and the lower arm of the second bridge arm to be turned on during a third time period, and the third switch, the lower arm of the first bridge arm group, and the upper arm of the second bridge arm to be turned off; the step of controlling the first switch, the second switch, the fourth switch, the fifth switch, the upper arm of the first bridge arm group, and the upper arm of the second bridge arm to be turned on, and the third switch, the lower arm of the first bridge arm group, and the lower arm of the second bridge arm to be turned off during a fifth time period when the first voltage is less than the third voltage, and the third switch, the lower arm of the first bridge arm group, and the lower arm of the second bridge arm to be turned off during a fifth time period; wherein, the third time period and the fifth time period constitute a third cycle, and within the third cycle, the third time period precedes the fifth time period.

[0016] The embodiments provided in this application can flexibly adjust the output voltage according to the needs of the load device without changing the circuit structure. At the same time, the power battery voltage regulation system itself provides energy to the motor, and the power battery can be boosted and discharged by turning on and off different switches in the same circuit.

[0017] In some embodiments, the third time period and the fourth time period are alternately distributed.

[0018] During the voltage reduction discharge process of the power battery, the alternating distribution of the third and fourth time periods enables continuous discharge after voltage reduction, ensuring the continuous progress of the discharge process.

[0019] In some embodiments, the third time period and the fifth time period are distributed alternately.

[0020] During the boost discharge process of the power battery, the alternating distribution of the third and fifth time periods enables continuous discharge after boosting, ensuring the continuous progress of the discharge process.

[0021] Thirdly, this application provides a power battery voltage regulation system, which includes a power battery, a switching module, a charging / discharging interface, and a motor; the switching module includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a first bridge arm group, and a second bridge arm; each bridge arm in the first bridge arm group and the second bridge arm includes an upper bridge arm and a lower bridge arm, the connection points of the upper and lower bridge arms of each bridge arm in the first bridge arm group are connected one-to-one with all the inductors in the motor, and the connection points of the upper and lower bridge arms of the second bridge arm are connected to the three-phase center point of the motor; one end of the first switch is connected to the positive terminal of the power battery, and the first switch... The other end of the switch is connected to one end of the third switch, and is connected to all the inductors in the motor through the upper arm of the first bridge arm group. The other end of the third switch is connected to one end of the fourth switch, and is connected to the three-phase center point of the motor through the upper arm of the second bridge arm. The other end of the fourth switch is connected to the positive terminal of the charging and discharging interface. One end of the second switch is connected to the negative terminal of the power battery. The other end of the second switch is connected to one end of the fifth switch, and is connected to all the inductors in the motor through the lower arm of the first bridge arm group. It is connected to the three-phase center point of the motor through the lower arm of the second bridge arm. The other end of the fifth switch is connected to the negative terminal of the charging and discharging interface.

[0022] The power battery voltage regulation system provided in this application fully considers the voltage regulation requirements of the power battery during charging and discharging under different conditions. Switches are set at key points in the charging and discharging circuit of the power battery, and by controlling the conduction and disconnection of different switches, direct charging, boost charging, boost discharging and buck discharging circuits are formed in the same circuit structure respectively. Therefore, the charging and discharging voltage of the power battery can be flexibly adjusted without changing the circuit structure to meet the charging or discharging voltage requirements of the power battery in different scenarios.

[0023] Fourthly, this application provides a control device for a power battery voltage regulation system, comprising: a processor, the processor being configured to execute the control method as described in any embodiment of the first aspect above, or to execute the control method as described in any embodiment of the second aspect above.

[0024] Fifthly, this application provides a power device, including a power battery voltage regulation system as described in the third aspect above, the power battery voltage regulation system being used to charge the power battery or to discharge the power battery, the power battery being used to provide electrical energy to the power device. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of an application architecture for the charging method provided in an embodiment of this application;

[0027] Figure 2 This is a schematic block diagram of the power battery voltage regulation system provided in the embodiments of this application;

[0028] Figure 3 This is a schematic flowchart of a control method for a power battery voltage regulation system provided in an embodiment of this application;

[0029] Figure 4 This is a schematic diagram of a charging circuit of a power battery voltage regulation system provided in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of another charging circuit of the power battery voltage regulation system provided in the embodiments of this application;

[0031] Figure 6 This is a schematic flowchart of another control method for a power battery voltage regulation system provided in the embodiments of this application;

[0032] Figure 7 This is a schematic diagram of another charging circuit of the power battery voltage regulation system provided in the embodiments of this application;

[0033] Figure 8 This is a schematic flowchart of another control method for a power battery voltage regulation system provided in the embodiments of this application;

[0034] Figure 9This is a schematic diagram of another charging circuit of the power battery voltage regulation system provided in the embodiments of this application;

[0035] Figure 10 This is a schematic diagram of another charging circuit of the power battery voltage regulation system provided in the embodiments of this application;

[0036] Figure 11 This is a schematic flowchart of another control method for a power battery voltage regulation system provided in the embodiments of this application;

[0037] Figure 12 This is a schematic diagram of another charging circuit of the power battery voltage regulation system provided in the embodiments of this application;

[0038] Figure 13 This is a schematic block diagram of a control device for a power battery voltage regulation system 10 provided in an embodiment of this application.

[0039] The accompanying drawings are not drawn to scale. Detailed Implementation

[0040] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0041] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0042] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] With the development of battery technology, the performance of power batteries is constantly improving, especially their voltage, which has generally seen a significant increase. For these new power batteries with higher voltages, only charging equipment capable of outputting a correspondingly higher voltage can charge them. However, most currently used charging equipment can only charge traditional power batteries with lower voltages, and their maximum output voltage cannot reach the voltage required by the new power batteries. Replacing all charging equipment to adapt to the new power batteries would lead to a waste of existing equipment and increase unnecessary costs.

[0044] In addition, with the development of various load devices (such as vehicle-mounted devices), the output voltage of the power battery required by different load devices is not the same. Therefore, a method is needed to enable the power battery to adjust the output voltage more flexibly during the discharge process in order to meet the needs of different load devices.

[0045] In view of this, embodiments of this application provide a power battery voltage regulation system and its control method and control device. The power battery voltage regulation system includes a power battery, a switching module, a charging and discharging interface and a motor. By controlling the on and off of different switches in the switching module, direct charging or boost charging can be achieved in different scenarios, or boost discharging or buck discharging can be achieved in different scenarios.

[0046] The power battery in this application embodiment can be a lithium-ion battery, lithium metal battery, lead-acid battery, nickel-metal hydride battery, lithium-sulfur battery, lithium-air battery, or sodium-ion battery, etc., and is not limited thereto. In terms of scale, the battery in this application embodiment can be a single cell, a battery module, or a battery pack, and is not limited thereto. In terms of application scenarios, the battery can be used in power devices such as automobiles and ships. For example, it can be used in electric vehicles to power the motor, serving as the power source for electric vehicles. The battery can also power other electrical components in electric vehicles, such as in-vehicle air conditioning and in-vehicle media players.

[0047] For ease of description, the following will use the application of power batteries in new energy vehicles (power vehicles) as an example.

[0048] The drive motor and its control system are among the core components of new energy vehicles, and their driving characteristics determine the main performance indicators of the vehicle. The motor drive system of a new energy vehicle mainly consists of an electric motor, a power converter, a motor controller (e.g., an inverter), various sensors, and a power supply. An electric motor is a rotating electromagnetic machine that operates based on the principle of electromagnetic induction, used to convert electrical energy into mechanical energy. During operation, it absorbs electrical power from the electrical system and outputs mechanical power to the mechanical system.

[0049] Figure 1 This diagram illustrates an application architecture for the charging method described in this application. The architecture includes a Battery Management System (BMS) 100 and a charging pile 200. The BMS 100 can be connected to the charging pile 200 via a communication cable for information exchange. For example, the communication cable can be a Controller Area Network (CAN) communication cable or a daisy-chain communication cable.

[0050] BMS 100 is the BMS for a power battery, which is a battery that provides power to an electrical device. Optionally, the power battery can be a power storage battery. In terms of battery type, the power battery can be a lithium-ion battery, lithium metal battery, lead-acid battery, nickel-metal hydride battery, lithium-sulfur battery, lithium-air battery, or sodium-ion battery, etc., and is not specifically limited in this application embodiment. In terms of battery size, the power battery in this application embodiment can be a cell / battery unit, or a battery module or battery pack, and is not specifically limited in this application embodiment. Optionally, the electrical device can be a vehicle, ship, or spacecraft, etc., and is not limited in this application embodiment. The BMS is a control system that protects the safe use of the power battery, implementing functions such as charge and discharge management, high-voltage control, battery protection, battery data collection, and battery status evaluation. The BMS can be integrated with the power battery in the same device, or it can be a separate device located outside the power battery.

[0051] Charging station 200, also known as a charger, is a device for charging power batteries. The charging station can output charging power according to the charging requirements of BMS100 to charge the power battery. For example, charging station 200 can output voltage and current according to the required voltage and current sent by BMS100.

[0052] To meet the charging voltage requirements of power batteries in different scenarios, this application provides a power battery voltage regulation system. For example... Figure 2As shown, the power battery voltage regulation system 10 includes a power battery 11, a switch module 12, a charging / discharging interface 13, and a motor 14. The switch module 12 includes a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, a first bridge arm group 121, and a second bridge arm 122. Each bridge arm in the first bridge arm group 121 and the second bridge arm 122 includes an upper bridge arm and a lower bridge arm. The connection points of the upper and lower bridge arms of each bridge arm in the first bridge arm group 121 are connected one-to-one with all the inductors in the motor 14. The connection points of the upper and lower bridge arms in the second bridge arm 122 are connected to the three-phase center point of the motor 14. One end of the first switch K1 is connected to the positive terminal of the power battery 11. The other end is connected to one end of the third switch K3, and is connected to all the inductors in the motor 14 through the upper arm of the first bridge arm group 121. The other end of the third switch K3 is connected to one end of the fourth switch K4, and is connected to the three-phase center point of the motor 14 through the upper arm of the second bridge arm 122. The other end of the fourth switch K4 is connected to the positive terminal of the charging and discharging interface 13. One end of the second switch K2 is connected to the negative terminal of the power battery 11. The other end of the second switch K2 is connected to one end of the fifth switch K5, and is connected to all the inductors in the motor 14 through the lower arm of the first bridge arm group 121, and is connected to the three-phase center point of the motor 14 through the lower arm of the second bridge arm 122. The other end of the fifth switch K5 is connected to the negative terminal of the charging and discharging interface 13.

[0053] The first switch K1, second switch K2, third switch K3, fourth switch K4, and fifth switch K5 in the switch module 12 can be relay switches. The control module controls the on / off state of these switches to form different circuits. The first switch K1 is used to connect or disconnect the connection between the part of the power battery voltage regulation system 10 other than the power battery 11 and the positive terminal of the battery; the second switch K2 is used to connect or disconnect the connection between the other part of the power battery voltage regulation system 10 other than the power battery 11 and the negative terminal of the battery; the third switch K3 is used to connect or disconnect the connection between the second bridge arm 122 and the charging / discharging interface 13, and between the first bridge arm group 121 and the power battery 11; the fourth switch K4 is used to connect or disconnect the connection between the part of the power battery voltage regulation system 10 other than the charging / discharging interface 13 and the positive terminal of the charging / discharging interface 13; the fifth switch K5 is used to connect or disconnect the connection between the part of the power battery voltage regulation system 10 other than the charging / discharging interface 13 and the negative terminal of the charging / discharging interface 13.

[0054] The first bridge arm group 121 and the second bridge arm 122 can be implemented by an inverter in the motor 14 drive system, wherein the inverter can be implemented using bridge arm switches of insulated gate bipolar transistors (IGBTs). The number of bridge arms in the first bridge 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, then the inverter includes three-phase bridge arms, namely, U-phase bridge arms, V-phase bridge arms, and W-phase bridge arms. Each of the three-phase bridge arms has an upper bridge arm and a lower bridge arm, and each upper bridge arm and lower bridge arm is provided with a switching unit. That is, the first bridge arm group 121 includes an upper bridge arm switch 1211 and a lower bridge arm switch 1212 in the U-phase bridge arm, an upper bridge arm switch 1213 and a lower bridge arm switch 1214 in the V-phase bridge arm, and an upper bridge arm switch 1215 and a lower bridge arm switch 1216 in the W-phase bridge arm. The second bridge arm 122 also has an upper bridge arm and a lower bridge arm, and each of the upper and lower bridge arms is provided with a switch unit, that is, the second bridge arm 122 includes an upper bridge arm switch 1221 and a lower bridge arm switch 1222.

[0055] The motor 14 may include multiple inductors. Taking a three-phase motor 14 as an example, it may include three inductors: inductor 141 connected to the U-phase bridge arm, inductor 142 connected to the V-phase bridge arm, and inductor 143 connected to the W-phase bridge arm. One end of inductor 141 is connected to the connection point between the upper and lower bridge arms of the U-phase bridge arm; one end of inductor 142 is connected to the connection point between the upper and lower bridge arms of the V-phase bridge arm; and one end of inductor 143 is connected to the connection point between the upper and lower bridge arms of the W-phase bridge arm. The other ends of inductors 141, 142, and 143 are connected together at the three-phase center point of the motor 14.

[0056] It should be noted that the motor 14 is not limited to a three-phase motor 14, but can also be a six-phase motor 14, etc. Correspondingly, the six-phase motor 14 may include a six-phase bridge arm.

[0057] Optionally, the power battery voltage regulation system 10 may also include a sixth switch K6, a seventh switch K7, a first capacitor C1, a second capacitor C2, and a resistor R.

[0058] The sixth switch K6 is located between the three-phase center point of the motor 14 and the connection point of the upper and lower bridge arms of the second bridge arm 122, and is used to disconnect or connect the high-voltage connection between the three-phase center point of the motor 14 and the connection point of the upper and lower bridge arms of the second bridge arm 122. In this embodiment, the sixth switch K6 can always be in the closed state.

[0059] The seventh switch K7 is connected in series with the resistor R and then in parallel across the two ends of the second switch K2. One end of the first capacitor C1 is connected to the positive terminal of the power battery 11 through the first switch K1, and the other end is connected to the negative terminal of the power battery 11 through the second switch K2. One end of the second capacitor C2 is connected to the positive terminal of the charging / discharging interface 13 through the fourth switch K4, and the other end is connected to the negative terminal of the charging / discharging interface 13 through the fifth switch K5. When making a high-voltage connection to the power battery voltage regulation system 10, the first switch K1 and the seventh switch K7 can be turned on first to precharge the first capacitor C1 and the second capacitor C2, avoiding damage to the circuit caused by high voltage. Specifically, a preset time can be set for the conduction of the seventh switch K7. After the preset time, the second switch K2 is turned on and the seventh switch K7 is turned off. In this embodiment, the seventh switch K7 can be turned on first within the preset time before the second switch K2 is turned on, and after the preset time, the second switch K2 is turned on and the seventh switch K7 is turned off.

[0060] The second capacitor C2 is used to stabilize the input voltage of the charging / discharging interface 13 and to absorb the voltage spikes when the second bridge arm 122 is disconnected, thus preventing damage to the second bridge arm 122. Both the first capacitor C1 and the second capacitor C2 can function as voltage regulators and filter out noise.

[0061] The power battery voltage regulation system 10 provided in this application fully considers the voltage regulation requirements of the power battery 11 during charging and discharging 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, direct charging, boost charging, boost discharging and buck discharging circuits are formed in the same circuit structure respectively. Therefore, 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.

[0062] Based on the aforementioned power battery voltage regulation system 10, and according to some embodiments of this application, this application also provides a control method for the power battery voltage regulation system 10, such as... Figures 3 to 7 As shown.

[0063] Figure 3 This is a schematic flowchart of a control method for a power battery voltage regulation system 10 provided in an embodiment of this application. It shows a schematic flow of the power battery voltage regulation system 10 during the charging process. The control method of the power battery voltage regulation system 10 includes the following steps.

[0064] S1. Obtain the first voltage and the second voltage. The first voltage is the voltage of the power battery 11, and the second voltage is the maximum output voltage of the charging device. The charging device is used to connect to the charging and discharging interface 13.

[0065] S11. When the first voltage is less than the second voltage, control the first switch K1, the second switch K2, the third switch K3, the fourth switch K4 and the fifth switch K5 to be turned on, and all bridge arms in the first bridge arm group 121 and the second bridge arm 122 to be turned off; or, S12. When the first voltage is greater than or equal to the second voltage, control the first switch K1, the second switch K2, the fourth switch K4 and the fifth switch K5, the upper bridge arm of the first bridge arm group 121 and the upper bridge arm of the second bridge arm 122 to be turned on, and the third switch K3, the lower bridge arm of the first bridge arm group 121 and the lower bridge arm of the second bridge arm 122 to be turned off.

[0066] In this embodiment, the above steps can be performed by a control module. The control module acquires a first voltage and a second voltage, that is, it acquires the voltage of the power battery 11 and the maximum output voltage of the charging device, compares their magnitudes, and determines the charging method for the power battery 11. The charging device is a device that provides electrical energy to the power battery 11; for example, the charging device can be a charging pile.

[0067] When the first voltage is lower than the second voltage, the charging device can provide sufficient voltage for the charging process of the power battery 11, thus allowing direct charging of the power battery 11 without the need for voltage adjustment. Specifically, the control module controls the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, and the fifth switch K5 in the power battery voltage regulation system 10 to be turned on, while all arms in the first bridge arm group 121 and the second bridge arm 122 are disconnected, forming a... Figure 4 The circuit shown is a direct charging circuit.

[0068] When the first voltage is greater than or equal to the second voltage, the charging equipment cannot provide sufficient voltage for the charging process of the power battery 11, therefore it is necessary to increase the charging voltage of the power battery 11. Specifically, the first switch K1, the second switch K2, the fourth switch K4, the fifth switch K5, the upper arm of the first bridge arm group 121 and the upper arm of the second bridge arm 122 are turned on, and the third switch K3, the lower arm of the first bridge arm group 121 and the lower arm of the second bridge arm 122 are turned off, so as to form a... Figure 5 The circuit shown is a boost charging circuit. Figure 5 In this system, the charging device and the motor 14, which has pre-stored energy, jointly provide power to the power battery 11. That is, the voltage provided by the charging device and the voltage provided by the motor 14 are superimposed, and the superimposed voltage is greater than the voltage of the power battery 11, thus charging the power battery 11. The motor 14 can store energy in advance through the circuit in the power battery voltage regulation system 10, or the motor 14 can be powered by an external device.

[0069] Optionally, the device for acquiring the first voltage and the second voltage can be a BMS in the control module, and the device for controlling the switching in the switch module 12 to turn on or off can be a microcontroller unit (MCU) in the control module. The BMS can compare the acquired first voltage and second voltage to determine the charging method and communicate with the MCU. For example, when the first voltage is less than the second voltage, the BMS sends a first message to the MCU, which indicates that direct charging should be used. The MCU can then control the corresponding switch to turn on or off based on the first message to form a direct charging circuit.

[0070] Similarly, when the first voltage is greater than or equal to the second voltage, the BMS sends a second message to the MCU, indicating that boost charging should be used. The MCU can then control the corresponding switches to turn on or off based on this second message, forming a boost charging circuit. The required charging voltage for the battery may vary at different stages of the charging process. Therefore, when the BMS sends the second message to the MCU, it can also simultaneously send the target voltage for the battery. This target voltage is the voltage required by the battery at the current charging stage and may be the same as or different from the first voltage obtained by the BMS in step S1.

[0071] The control method of the power battery voltage regulation system 10 provided in this application embodiment can, under different conditions, enable the charging device to charge both power batteries 11 with voltages lower than the maximum output voltage of the charging device and power batteries 11 with voltages higher than the maximum output voltage of the charging device, without changing the existing charging facilities, by controlling the on and off of different switches in the control circuit structure. This control method can flexibly adjust the charging voltage of the power battery 11 in different scenarios, solving the compatibility problem of external charging devices and ensuring that the charging process of the power battery 11 is not limited by the maximum output voltage of the charging device.

[0072] According to some embodiments of this application, optionally, when the first voltage is greater than or equal to the second voltage, the control method further includes: S121, controlling the fourth switch K4, the fifth switch K5, the lower bridge arm of the first bridge arm group 121 and the upper bridge arm of the second bridge arm 122 to be turned on during the first time period, and the third switch K3, the upper bridge arm of the first bridge arm group 121 and the lower bridge arm of the second bridge arm 122 to be turned off.

[0073] Step S12 can be specifically as follows: S122, in the second time period, control the first switch K1, the second switch K2, the fourth switch K4, the fifth switch K5, the upper bridge arm of the first bridge arm group 121 and the upper bridge arm of the second bridge arm 122 to be connected, and the third switch K3, the lower bridge arm of the first bridge arm group 121 and the lower bridge arm of the second bridge arm 122 to be disconnected.

[0074] The first and second time periods constitute the first cycle, with the first time period preceding the second time period within the first cycle.

[0075] Figure 6 A schematic flowchart of another control method for a power battery voltage regulation system 10 provided in an embodiment of this application is shown, namely a control method for boost charging of the power battery 11.

[0076] When the first voltage is greater than or equal to the second voltage, the charging device and the motor 14 with pre-stored energy together provide power to the power battery 11, wherein the pre-stored energy in the motor 14 can be provided by the circuit of the power battery voltage regulation system 10 itself.

[0077] Specifically, the control module can control the fourth switch K4, the fifth switch K5, the lower bridge arm of the first bridge arm group 121, and the upper bridge arm of the second bridge arm 122 to be turned on, while the first switch K1, the second switch K2, the third switch K3, the upper bridge arm of the first bridge arm group 121, and the lower bridge arm of the second bridge arm 122 are turned off, to form a configuration as shown in the diagram. Figure 7 The circuit shown. In Figure 7 In this process, the charging device only provides electrical energy to the motor 14, and the motor 14 stores energy through its own inductance.

[0078] Motor 14 passes through the first time period Figure 7 After the circuit shown stores energy, it can form a boost charging circuit in the second time period, charging the power battery 11 together with the charging equipment. Specifically, step S122 is to control the switch to be turned on or off in step S12 in the second time period. The first time period and the second time period can form a first cycle. In a first cycle, the energy of the motor 14 is stored in the first time period, and then the boosted charging voltage is provided to the power battery 11 in the second time period.

[0079] The embodiments provided in this application can flexibly adjust the charging voltage of the power battery 11 according to the relationship between the voltage of the charging device and the power battery 11 without changing the circuit structure. At the same time, the power battery voltage regulation system 10 itself provides energy to the motor 14 by utilizing its own circuit structure. The power battery 11 can be boosted and charged in the same circuit by turning on and off different switches.

[0080] According to some embodiments of this application, optionally, the first time period and the second time period are distributed alternately.

[0081] During the boost charging process of the power battery 11, the circuits formed in the first and second time periods can be rapidly and alternately switched multiple times within a certain period of time, so that after the charging voltage of the power battery 11 rises to the predetermined value, it can continuously charge the power battery 11.

[0082] To minimize the on / off switching of control switches and extend their lifespan, during the alternating periods of the first and second time segments, the first switch K1 and the second switch K2 can remain on during the first time segment, while only the upper and lower bridge arms of the first bridge arm group 121 are alternately controlled to achieve alternating conduction of the current loops formed in the first and second time segments. Figure 7 In the circuit shown, keeping the first switch K1 and the second switch K2 on will not affect the direction of the current in the circuit.

[0083] During the charging process of the power battery 11, the alternating distribution of the first and second time periods enables continuous charging after voltage boost, ensuring the continuous charging process.

[0084] According to some embodiments of this application, this application also provides another control method for the power battery voltage regulation system 10, such as... Figures 8 to 12 As shown, based on the aforementioned power battery voltage regulation system 10, this control method includes the following steps.

[0085] S2. Obtain the first voltage and the third voltage. The first voltage is the voltage of the power battery 11, and the third voltage is the requested voltage of the load device. The load device is used to connect to the charging and discharging interface 13.

[0086] S21. When the first voltage is greater than the third voltage, control the fourth switch K4, the fifth switch K5, the lower bridge arm of the first bridge arm group 121 and the upper bridge arm of the second bridge arm 122 to be turned on, and control the third switch K3, the upper bridge arm of the first bridge arm group 121 and the lower bridge arm of the second bridge arm 122 to be turned off; or, S22. When the first voltage is less than the third voltage, control the first switch K1, the second switch K2, the fourth switch K4, the fifth switch K5, the upper bridge arm of the first bridge arm group 121 and the upper bridge arm of the second bridge arm 122 to be turned on, and control the third switch K3, the lower bridge arm of the first bridge arm group 121 and the lower bridge arm of the second bridge arm 122 to be turned off.

[0087] Figure 8 This is a schematic flowchart illustrating another control method for a power battery voltage regulation system 10 provided in this application embodiment, showing a schematic flowchart of the power battery voltage regulation system 10 during the discharge process. The control module acquires a first voltage and a third voltage, that is, acquires the voltage of the power battery 11 and the requested voltage of the load device, compares the magnitudes of the two, and determines the discharge mode of the power battery 11. The load device is a device that consumes electrical energy to operate; for example, the load device can be a vehicle-mounted device.

[0088] When the first voltage is greater than the third voltage, the voltage of the power battery 11 is greater than the requested voltage of the load device, requiring the circuit output voltage to be reduced to match the requested voltage of the load device. Specifically, the fourth switch K4, the fifth switch K5, the lower arm of the first bridge arm group 121, and the upper arm of the second bridge arm 122 are turned on, while the first switch K1, the second switch K2, the third switch K3, the upper arm of the first bridge arm group 121, and the lower arm of the second bridge arm 122 are turned off, thus forming... Figure 9 The circuit shown is a step-down discharge circuit. Figure 9 In this system, the load device is powered only by the motor 14, which has pre-stored energy. By controlling the energy stored in the motor 14, a voltage matching the requested voltage of the load device is provided.

[0089] When the first voltage is lower than the third voltage, the voltage of the power battery 11 is lower than the requested voltage of the load device, requiring the circuit's output voltage to be increased to match the requested voltage of the load device. Specifically, the first switch K1, the second switch K2, the fourth switch K4, the fifth switch K5, the upper arm of the first bridge arm group 121, and the upper arm of the second bridge arm 122 are turned on, while the third switch K3, the lower arm of the first bridge arm group 121, and the lower arm of the second bridge arm 122 are turned off, thus forming... Figure 10 The circuit shown is a boost discharge circuit. Figure 10 In this system, the power battery 11 and the motor 14, which has pre-stored energy, jointly provide power to the load device. In other words, the voltage provided by the power battery 11 and the voltage provided by the motor 14 are superimposed, and the superimposed voltage can match the requested voltage of the load device, thus providing power to the load device.

[0090] In the power battery voltage regulation system 10 provided in this application embodiment, the motor 14 can store energy in advance through the circuit in the power battery voltage regulation system 10, or the motor 14 can be powered by an external device.

[0091] In another possible implementation, the control module can first turn on switches that do not affect the current loop, and then change the current loop by only changing the on or off state of some switches. Specifically, when the power battery 11 needs to discharge, the control module first controls the first switch K1, the second switch K2, the fourth switch K4, and the fifth switch K5 to turn on, while the other switches are turned off. Then, based on the judgment of the first voltage and the third voltage, if the first voltage is greater than the third voltage, the control module further controls the lower bridge arm of the first bridge arm group 121 and the upper bridge arm of the second bridge arm 122 to turn on, and the upper bridge arm of the first bridge arm group 121 and the lower bridge arm of the second bridge arm 122 to turn off, so as to form a step-down discharge loop; or, if the first voltage is less than the third voltage, the control module further controls the upper bridge arm of the first bridge arm group 121 and the upper bridge arm of the second bridge arm 122 to turn on, and the lower bridge arm of the first bridge arm group 121 and the lower bridge arm of the second bridge arm 122 to turn off, so as to form a step-up discharge loop. In other words, the steps of the control module in determining the first and third voltages are not sequential with the steps of controlling the first switch K1, the second switch K2, the fourth switch K4, and the fifth switch K5 to conduct.

[0092] Optionally, the device for obtaining the first voltage and the third voltage can be a BMS in the control module, and the device for controlling the switching in the switch module 12 to turn on or off can be an MCU in the control module.

[0093] In one possible implementation, the BMS compares the acquired first voltage and third voltage to determine the discharge method and communicates with the MCU. For example, when the first voltage is greater than the third voltage, the BMS sends a third message to the MCU, indicating that a buck discharge method should be used. The MCU can then control the corresponding switches to turn on or off based on the third message, forming a buck discharge circuit. Similarly, when the first voltage is less than the third voltage, the BMS sends a fourth message to the MCU, indicating that a boost discharge method should be used. The MCU can then control the corresponding switches to turn on or off based on the fourth message, forming a boost discharge circuit.

[0094] In another possible implementation, the BMS acquires the first and third voltages and communicates with the MCU. For example, the BMS can send a fifth message to the MCU, which indicates the formation of a discharge circuit. Upon receiving the fifth message, the MCU controls the switches that do not affect the current circuit to conduct, i.e., controls the first switch K1, the second switch K2, the fourth switch K4, and the fifth switch K5 to conduct, while the other switches are deactivated. Furthermore, the BMS determines the discharge mode based on the first and third voltages and instructs the MCU to control the corresponding switches to conduct or deactivate via the third or fourth message, thus forming the corresponding discharge circuit.

[0095] The control method of the power battery voltage regulation system 10 provided in this application embodiment can adapt to various load devices with different voltage requirements under different conditions by controlling the on and off of different switches in the control circuit structure without changing the circuit structure. This allows the power battery voltage regulation system 10 to provide power to load devices with a voltage requirement higher than that of the power battery 11, as well as load devices with a voltage requirement lower than that of the power battery 11. This enables flexible adjustment of the discharge voltage of the power battery 11 in different scenarios to provide power to various load devices.

[0096] Optionally, according to some embodiments of this application, the control method provided in the embodiments of this application further includes: S23, controlling the first switch K1, the second switch K2, the upper bridge arm of the first bridge arm group 121 and the lower bridge arm of the second bridge arm 122 to be turned on during the third time period, and the third switch K3, the lower bridge arm of the first bridge arm group 121 and the upper bridge arm of the second bridge arm 122 to be turned off.

[0097] Step S21 can be specifically as follows: S211, when the first voltage is greater than the third voltage, control the fourth switch K4, the fifth switch K5, the lower bridge arm of the first bridge arm group 121 and the upper bridge arm of the second bridge arm 122 to conduct during the fourth time period, and control the third switch K3, the upper bridge arm of the first bridge arm group 121 and the lower bridge arm of the second bridge arm 122 to disconnect.

[0098] The third and fourth time periods constitute the second cycle, with the third time period preceding the fourth time period within the second cycle.

[0099] Figure 11 A schematic flowchart of another control method for a power battery voltage regulation system 10 provided in an embodiment of this application is shown, namely a control method for the power battery 11 under step-down charging conditions.

[0100] In the circuit formed by step-down charging, only the motor 14, which has pre-stored energy, provides power to the load device. The energy pre-stored in the motor 14 can be provided by the circuit of the power battery voltage regulation system 10 itself.

[0101] Specifically, the control module can control the first switch K1, the second switch K2, the upper bridge arm of the first bridge arm group 121, and the lower bridge arm of the second bridge arm 122 to be turned on, while the third switch K3, the fourth switch K4, the fifth switch K5, the lower bridge arm of the first bridge arm group 121, and the upper bridge arm of the second bridge arm 122 are turned off, so as to form a... Figure 12 The circuit shown. In Figure 12 In this configuration, the power battery 11 provides electrical energy solely to the motor 14, which stores energy through its own inductance.

[0102] Motor 14 passes through the third period Figure 12After the circuit shown stores energy, a reduced-voltage discharge circuit can be formed in the fourth time period, where the pre-stored energy motor 14 provides power to the load device. Specifically, step S211 is to control the switch to be turned on or off in step S21 in the fourth time period. The third and fourth time periods can form a second cycle. In a second cycle, the energy of the motor 14 is first stored in the third time period, and then the reduced discharge voltage is provided to the load device in the fourth time period.

[0103] The embodiments provided in this application can flexibly adjust the output voltage according to the needs of the load device without changing the circuit structure. At the same time, the power battery voltage regulation system 10 itself provides energy to the motor 14, and the power battery 11 can be de-voltage discharged by turning on and off different switches in the same circuit.

[0104] Optionally, according to some embodiments of this application, the control method provided in the embodiments of this application further includes: S23, controlling the first switch K1, the second switch K2, the upper bridge arm of the first bridge arm group 121 and the lower bridge arm of the second bridge arm 122 to be turned on during the third time period, and the third switch K3, the lower bridge arm of the first bridge arm group 121 and the upper bridge arm of the second bridge arm 122 to be turned off.

[0105] Step S22 can be specifically as follows: S221, when the first voltage is less than the third voltage, during the fifth time period, control the first switch K1, the second switch K2, the fourth switch K4, the fifth switch K5, the upper bridge arm of the first bridge arm group 121 and the upper bridge arm of the second bridge arm 122 to be turned on, and the third switch K3, the lower bridge arm of the first bridge arm group 121 and the lower bridge arm of the second bridge arm 122 to be turned off.

[0106] The third and fifth time periods constitute the third cycle, with the third time period preceding the fifth time period within the third cycle.

[0107] Step S23 has been described in detail above and will not be repeated here. Motor 14 passes through the third time period. Figure 12 After the circuit shown stores energy, a boost discharge circuit can be formed in the fifth time period, where the power battery 11 and the motor 14 with pre-stored energy jointly provide power to the load device. Specifically, step S221 is to control the switch to be turned on or off in step S22 in the fifth time period. The third and fifth time periods can form a third cycle. In a third cycle, the energy of the motor 14 is first stored in the third time period, and then the boosted discharge voltage is provided to the load device in the fifth time period.

[0108] The embodiments provided in this application can flexibly adjust the output voltage according to the needs of the load device without changing the circuit structure. At the same time, the power battery voltage regulation system 10 itself provides energy to the motor 14, and the power battery 11 can be boosted and discharged in the same circuit by turning on and off different switches.

[0109] According to some embodiments of this application, the third time period and the fourth time period may optionally be distributed alternately.

[0110] The motor 14 stores energy in the third period and provides power to the load device in the fourth period. The circuits formed in the third and fourth periods can be rapidly and alternately switched multiple times within a certain period of time, so that the output voltage provided by the motor 14 can continuously provide power to the load device after reaching a predetermined value.

[0111] To minimize the switching on and off of control switches and extend their lifespan, during the alternating periods of the third and fourth time segments, switches K1, K2, K4, and K5 can be kept on. Only during the third time segment is the upper arm of the first bridge arm group 121 and the lower arm of the second bridge arm 122 switched on, and the lower arm of the first bridge arm group 121 and the upper arm of the second bridge arm 122 switched off. Similarly, during the fourth time segment, the lower arm of the first bridge arm group 121 and the upper arm of the second bridge arm 122 are switched on, and the upper arm of the first bridge arm group 121 and the lower arm of the second bridge arm 122 are switched off. Maintaining the on state of switches K1, K2, K4, and K5 in the circuit formed during either the third or fourth time segment does not affect the direction of the current in the circuit.

[0112] During the voltage reduction discharge process of the power battery 11, the third and fourth time periods are alternately distributed to achieve continuous discharge after voltage reduction, ensuring the continuous discharge process.

[0113] According to some embodiments of this application, the third time period and the fifth time period may optionally be distributed alternately.

[0114] The motor 14 stores energy in the third period and provides power to the load device in the fifth period. The circuits formed in the third and fifth periods can be rapidly and alternately switched multiple times within a certain period of time, so that after the output voltage jointly provided by the power battery 11 and the motor 14 reaches the predetermined value, it can continuously provide power to the load device.

[0115] To minimize the switching on and off of control switches and extend their lifespan, during the alternating periods of the third and fifth time segments, switches K1, K2, K4, and K5 can be kept on. Only during the third time segment is the upper arm of the first bridge arm group 121 and the lower arm of the second bridge arm 122 switched on, and the lower arm of the first bridge arm group 121 and the upper arm of the second bridge arm 122 switched off. Similarly, during the fifth time segment, the upper arm of the first bridge arm group 121 and the upper arm of the second bridge arm 122 are switched on, and the lower arm of the first bridge arm group 121 and the lower arm of the second bridge arm 122 are switched off. Maintaining the on state of switches K1, K2, K4, and K5 in the circuit formed during either the third or fifth time segment does not affect the direction of the current in the circuit.

[0116] During the boost discharge process of the power battery 11, the alternating distribution of the third and fifth time periods enables continuous discharge after boosting, ensuring the continuous progress of the discharge process.

[0117] According to some embodiments of this application, this application also provides a control device for a power battery voltage regulation system 10, including: a processor, the processor being used to execute the methods of the various embodiments described above.

[0118] Figure 13 A schematic block diagram of the control device 1300 of the power battery voltage regulation system 10 according to an embodiment of this application is shown. Figure 13 As shown, the control device 1300 includes a processor 1301. Optionally, the control device 1300 also includes a memory 1302, wherein the memory 1302 is used to store instructions, and the processor 1301 is used to read the instructions and execute the methods of the various embodiments of the present application based on the instructions.

[0119] Alternatively, the processor 1301 may be a control module in any of the above embodiments.

[0120] According to some embodiments of this application, this application also provides a power device, which includes a power battery voltage regulation system 10 provided in the embodiments of this application. The power battery voltage regulation system 10 is used to charge or discharge the power battery 11, and the power battery 11 is used to provide electrical energy to the power device.

[0121] Alternatively, the power unit can be a motor vehicle.

[0122] This application also provides a readable storage medium for storing a computer program for performing the methods described in the various embodiments of this application.

[0123] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0124] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0125] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0126] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0127] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0128] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0129] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control method for a power battery voltage regulation system (10), characterized in that, The power battery voltage regulation system (10) includes a power battery (11), a switching module (12), a charging and discharging interface (13), and a motor (14). The switch module (12) includes a first switch (K1), a second switch (K2), a third switch (K3), a fourth switch (K4), a fifth switch (K5), a first bridge arm group (121), and a second bridge arm (122). Each arm in the first arm group (121) and the second arm group (122) includes an upper arm and a lower arm. The connection points of the upper arm and the lower arm of each arm in the first arm group (121) are connected one-to-one with all the inductors in the motor (14). The connection points of the upper arm and the lower arm in the second arm group (122) are connected with the three-phase center point of the motor (14). One end of the first switch (K1) is connected to the positive terminal of the power battery (11), the other end of the first switch (K1) is connected to one end of the third switch (K3), and is connected to all the inductors in the motor (14) through the upper arm of the first bridge arm group (121), the other end of the third switch (K3) is connected to one end of the fourth switch (K4), and is connected to the three-phase center point of the motor (14) through the upper arm of the second bridge arm (122), the other end of the fourth switch (K4) is connected to the positive terminal of the charging and discharging interface (13); One end of the second switch (K2) is connected to the negative terminal of the power battery (11), and the other end of the second switch (K2) is connected to one end of the fifth switch (K5). It is connected to all the inductors in the motor (14) through the lower arm of the first bridge arm group (121), and connected to the three-phase center point of the motor (14) through the lower arm of the second bridge arm (122). The other end of the fifth switch (K5) is connected to the negative terminal of the charging and discharging interface (13). The control method includes: Obtain a first voltage and a second voltage, wherein the first voltage is the voltage of the power battery (11) and the second voltage is the maximum output voltage of the charging device, and the charging device is used to connect to the charging and discharging interface (13). When the first voltage is less than the second voltage, the first switch (K1), the second switch (K2), the third switch (K3), the fourth switch (K4), and the fifth switch (K5) are turned on, and all bridge arms in the first bridge arm group (121) and the second bridge arm (122) are turned off; or, When the first voltage is greater than or equal to the second voltage, the fourth switch (K4), the fifth switch (K5), the lower bridge arm of the first bridge arm group (121) and the upper bridge arm of the second bridge arm (122) are turned on during the first time period, while the third switch (K3), the upper bridge arm of the first bridge arm group (121) and the lower bridge arm of the second bridge arm (122) are turned off. During the second time period, the first switch (K1), the second switch (K2), the fourth switch (K4), the fifth switch (K5), the upper bridge arm of the first bridge arm group (121) and the upper bridge arm of the second bridge arm (122) are turned on, while the third switch (K3), the lower bridge arm of the first bridge arm group (121) and the lower bridge arm of the second bridge arm (122) are turned off. The first time period and the second time period constitute a first cycle. Within the first cycle, the first time period precedes the second time period, and the first time period and the second time period alternate.

2. A control method for a power battery voltage regulation system (10), characterized in that, The power battery voltage regulation system (10) includes a power battery (11), a switching module (12), a charging and discharging interface (13), and a motor (14). The switch module (12) includes a first switch (K1), a second switch (K2), a third switch (K3), a fourth switch (K4), a fifth switch (K5), a first bridge arm group (121), and a second bridge arm (122). Each arm in the first arm group (121) and the second arm group (122) includes an upper arm and a lower arm. The connection points of the upper arm and the lower arm of each arm in the first arm group (121) are connected one-to-one with all the inductors in the motor (14). The connection points of the upper arm and the lower arm in the second arm group (122) are connected with the three-phase center point of the motor (14). One end of the first switch (K1) is connected to the positive terminal of the power battery (11), the other end of the first switch (K1) is connected to one end of the third switch (K3), and is connected to all the inductors in the motor (14) through the upper arm of the first bridge arm group (121), the other end of the third switch (K3) is connected to one end of the fourth switch (K4), and is connected to the three-phase center point of the motor (14) through the upper arm of the second bridge arm (122), the other end of the fourth switch (K4) is connected to the positive terminal of the charging and discharging interface (13); One end of the second switch (K2) is connected to the negative terminal of the power battery (11), and the other end of the second switch (K2) is connected to one end of the fifth switch (K5). It is connected to all the inductors in the motor (14) through the lower arm of the first bridge arm group (121), and connected to the three-phase center point of the motor (14) through the lower arm of the second bridge arm (122). The other end of the fifth switch (K5) is connected to the negative terminal of the charging and discharging interface (13). The control method includes: Obtain a first voltage and a third voltage, wherein the first voltage is the voltage of the power battery (11) and the third voltage is the requested voltage of the load device, and the load device is used to connect to the charging and discharging interface (13). During the third time period, the first switch (K1), the second switch (K2), the upper bridge arm of the first bridge arm group (121) and the lower bridge arm of the second bridge arm (122) are turned on, while the third switch (K3), the lower bridge arm of the first bridge arm group (121) and the upper bridge arm of the second bridge arm (122) are turned off. When the first voltage is greater than the third voltage, during the fourth time period, the fourth switch (K4), the fifth switch (K5), the lower bridge arm of the first bridge arm group (121), and the upper bridge arm of the second bridge arm (122) are turned on, while the third switch (K3), the upper bridge arm of the first bridge arm group (121), and the lower bridge arm of the second bridge arm (122) are turned off. The third time period and the fourth time period constitute a second cycle. Within this second cycle, the third time period precedes the fourth time period, and the third and fourth time periods alternate. Alternatively, When the first voltage is less than the third voltage, the first switch (K1), the second switch (K2), the fourth switch (K4), the fifth switch (K5), the upper arm of the first bridge arm group (121) and the upper arm of the second bridge arm (122) are turned on, and the third switch (K3), the lower arm of the first bridge arm group (121) and the lower arm of the second bridge arm (122) are turned off.

3. The control method according to claim 2, characterized in that, The control method further includes: During the third time period, the first switch (K1), the second switch (K2), the upper bridge arm of the first bridge arm group (121) and the lower bridge arm of the second bridge arm (122) are turned on, while the third switch (K3), the lower bridge arm of the first bridge arm group (121) and the upper bridge arm of the second bridge arm (122) are turned off. When the first voltage is less than the third voltage, controlling the first switch (K1), the second switch (K2), the fourth switch (K4), the fifth switch (K5), the upper arm of the first bridge arm group (121), and the upper arm of the second bridge arm (122) to be turned on, and the third switch (K3), the lower arm of the first bridge arm group (121), and the lower arm of the second bridge arm (122) to be turned off, includes: When the first voltage is less than the third voltage, during the fifth time period, the first switch (K1), the second switch (K2), the fourth switch (K4), the fifth switch (K5), the upper arm of the first bridge arm group (121) and the upper arm of the second bridge arm (122) are turned on, and the third switch (K3), the lower arm of the first bridge arm group (121) and the lower arm of the second bridge arm (122) are turned off. The third time period and the fifth time period constitute the third cycle, and within the third cycle, the third time period precedes the fifth time period.

4. The control method according to claim 3, characterized in that, The third time period and the fifth time period are distributed alternately.

5. A control device for a power battery voltage regulation system (10), characterized in that, include: A processor, the processor being configured to perform the control method as described in claim 1, or to perform the control method as described in any one of claims 2 to 4.

6. A power unit, characterized in that, Includes a power battery voltage regulation system (10) as described in claim 1 or 2, the power battery voltage regulation system (10) being used to charge the power battery (11) or to discharge the power battery (11), the power battery (11) being used to provide electrical energy to the power device.

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