Voltage equalization circuit and vehicle

Abstract

A vehicle comprising a voltage equalization circuit, the voltage equalization circuit comprising a controller, a first motor electric control assembly, and a first battery module; the first motor electric control assembly comprises a first motor winding and a first bridge arm converter, and the first battery module comprises a first battery and a second battery connected in series; the controller is connected to the first bridge arm converter and is used, when the voltage of the first battery and the voltage of the second battery are unequal, for causing the first motor winding to charge or discharge by means of control of the first bridge arm converter, so as to equalize the voltage of the first battery and the voltage of the second battery.

Description

Voltage equalization circuit and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to a Chinese patent application filed with the Patent Office of China on November 30, 2023, with application number 2311641646.3 and titled “Voltage Equalizing Circuit and Vehicle,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of vehicle technology, and in particular, to a voltage balancing circuit and a vehicle. Background Art

[0004] With the advancement of vehicle technology, an increasing number of low-voltage loads are connected to the low-voltage power supply system. Some of these low-voltage loads are more powerful than standard low-voltage loads, making it difficult for the 12V low-voltage power supply system to meet the demands of this ever-increasing number of low-voltage loads. A new 48V low-voltage power supply system has been added to the vehicle to supply power to these high-power low-voltage loads. However, this new 48V low-voltage power supply system is connected to the vehicle's power supply via an isolated DC / DC converter to convert the high-voltage power to a low-voltage 48V. This new isolated DC / DC converter increases vehicle manufacturing costs. Summary of the Invention

[0005] In order to achieve the above objectives, the present disclosure provides a voltage balancing circuit and a vehicle.

[0006] A first aspect of the present disclosure provides a voltage balancing circuit, comprising: a controller, a first motor electronic control component, and a first battery module; the first motor electronic control component comprises a first motor winding and a first bridge arm converter; the first battery module comprises a first battery and a second battery connected in series;

[0007] The controller is connected to the first bridge arm converter and is used to control the first bridge arm converter to charge or discharge the first motor winding when the voltage of the first battery and the voltage of the second battery are unbalanced, so as to balance the voltage of the first battery and the second battery.

[0008] Optionally, a first end of the first motor winding is connected to the negative electrode of the first battery and the positive electrode of the second battery, and a second end of the first motor winding is connected to the midpoint of the first bridge arm converter;

[0009] The first end of the first bridge arm converter is connected to the positive electrode of the first battery, and the second end of the first bridge arm converter is connected to the negative electrode of the second battery;

[0010] The controller is specifically configured to control the upper and lower bridge switches of the first bridge arm converter to be alternately turned on when the voltage of the first battery and the voltage of the second battery are unbalanced, so as to alternately charge and discharge the first and second batteries.

[0011] Optionally, the voltage balancing circuit further includes: a second motor electronic control component and a second battery module, wherein the second motor electronic control component includes a second motor winding and a second bridge arm converter;

[0012] The controller is also connected to the second bridge arm converter and is used to charge and discharge the second motor winding by controlling the second bridge arm converter when the voltage of the first battery module and the voltage of the second battery module are unbalanced, so as to balance the voltage of the first battery module and the voltage of the second battery module.

[0013] Optionally, a first end of the second motor winding is connected to the negative electrode of the second battery module, and a second end of the second motor winding is connected to the midpoint of the second bridge arm converter;

[0014] The first end of the second bridge arm converter is connected to the positive electrode of the second battery module, and the second end of the second bridge arm converter is connected to the negative electrode of the first battery module;

[0015] The controller is specifically used to control the upper bridge switch tube and the lower bridge switch tube of the second bridge arm converter to alternately turn on when the voltage of the first battery module and the voltage of the second battery module are unbalanced, so that the first battery module and the second battery module are alternately charged and discharged.

[0016] Optionally, the controller is specifically configured to:

[0017] At a first timing of a preset voltage balancing timing, controlling the upper bridge switch of the first bridge arm converter to be turned on, so that the first battery, the first motor winding, and the first bridge arm converter form a first path, so that the first battery charges the first motor winding;

[0018] At a second timing of the preset voltage balancing timing, controlling the lower bridge switch of the first bridge arm converter to be turned on, so that the second battery, the first motor winding, and the first bridge arm converter form a second path, so that the first motor winding charges the second battery;

[0019] The preset voltage balancing timing is used to represent a control timing of alternately charging and discharging the first battery and the second battery in the voltage balancing circuit.

[0020] Optionally, the voltage balancing circuit further includes: a first conversion switch, wherein a first end of the first conversion switch is connected to the first end of the first motor winding, and a second end of the first conversion switch is connected to the negative electrode of the first battery and the positive electrode of the second battery;

[0021] The controller is also connected to the first transfer switch and is used to control the first transfer switch to be closed before the upper bridge switch tube and the lower bridge switch tube of the first bridge arm converter are alternately turned on to alternately charge and discharge the first battery and the second battery.

[0022] Optionally, the controller is further used to obtain the voltage of the first battery and the voltage of the second battery, and determine that the voltage of the first battery and the voltage of the second battery are unbalanced when it is determined that the difference between the voltage of the first battery and the voltage of the second battery is greater than a first preset voltage threshold.

[0023] Optionally, the controller is specifically configured to:

[0024] At a third timing of the preset voltage balancing timing, the upper bridge switch of the second bridge arm converter is controlled to be turned on, so that the second battery module, the second motor winding, and the second bridge arm converter form a third path, so that the second battery module charges the second motor winding;

[0025] At a fourth timing of the preset voltage balancing timing, the lower bridge switch of the second bridge arm converter is controlled to be turned on, so that the first battery module, the second motor winding, and the second bridge arm converter form a fourth path, so that the second motor winding charges the first battery module;

[0026] The preset voltage balancing timing is used to represent a control timing of alternately charging and discharging the first battery module and the second battery module in the voltage balancing circuit.

[0027] Optionally, the controller is further used to obtain the voltage of the first battery module and the voltage of the second battery module, and determine that the voltage of the first battery module and the voltage of the second battery module are unbalanced when it is determined that the difference between the voltage of the second battery module and the voltage of the first battery module is greater than a second preset voltage threshold.

[0028] Optionally, the voltage balancing circuit further includes: a second transfer switch, wherein a first end of the second transfer switch is connected to the first end of the second motor winding, and a second end of the second transfer switch is connected to the first end of the first bridge arm converter, the positive electrode of the first battery module, and the negative electrode of the second battery module;

[0029] The controller is also connected to the second conversion switch and is used to control the second conversion switch to be closed before the upper bridge switch tube and the lower bridge switch tube of the second bridge arm converter are alternately turned on to alternately charge and discharge the first battery module and the second battery module.

[0030] Optionally, the second battery is used to connect to a low-voltage electrical device to supply power to the low-voltage electrical device.

[0031] A second aspect of the present disclosure provides a vehicle, comprising: the voltage balancing circuit as described in the first aspect.

[0032] Through the above technical solution, the voltage balancing circuit passes through a controller, a first motor electronic control component and a first battery module; the first motor electronic control component includes a first motor winding and a first bridge arm converter, the first battery module includes a first battery and a second battery connected in series, and the controller is connected to the first bridge arm converter, and is used to control the first bridge arm converter to charge or discharge the first motor winding when the voltage of the first battery and the voltage of the second battery are unbalanced, so as to balance the voltage of the first battery and the second battery. In this way, the first motor winding can be charged or discharged by controlling the first bridge arm converter to balance the voltage of the first battery and the second battery, thereby improving the service life of the battery and helping to improve the performance of the vehicle.

[0033] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0035] FIG1 is a schematic diagram of a voltage balancing circuit according to an exemplary embodiment of the present disclosure;

[0036] FIG2 is a schematic diagram of a voltage balancing circuit according to the embodiment shown in FIG1 ;

[0037] FIG3 is a schematic diagram of another voltage balancing circuit according to an exemplary embodiment of the present disclosure;

[0038] FIG4 is a schematic diagram showing current flow in a voltage balancing circuit according to the embodiment shown in FIG3 ;

[0039] FIG5 is a schematic diagram showing current flow in another voltage balancing circuit according to the embodiment shown in FIG3 ;

[0040] FIG6 is a schematic diagram showing current flow in another voltage balancing circuit according to the embodiment shown in FIG3 ;

[0041] FIG7 is a schematic diagram showing current flow in yet another voltage balancing circuit according to the embodiment shown in FIG3 ;

[0042] FIG8 is a schematic diagram of a voltage balancing circuit according to the embodiment shown in FIG2 ;

[0043] FIG9 is a schematic diagram of a voltage balancing circuit according to the embodiment shown in FIG3 ;

[0044] FIG10 is a block diagram of a vehicle according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0045] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0046] Before introducing the specific embodiments of the present disclosure in detail, the application scenarios of the present disclosure are first described as follows. The present disclosure can be applied to a vehicle, which includes multiple low-voltage power supply platforms, each of which is connected to the vehicle battery with an isolated step-down DC / DC converter. For example, the vehicle may include a 12V power supply platform and a 48V power supply platform. The 12V power supply platform is connected to the vehicle's high-voltage power battery through a first isolated step-down DC / DC converter for supplying power to the vehicle's 12V loads. The 48V power supply platform is connected to the vehicle's high-voltage power battery through a second isolated step-down DC / DC converter for supplying power to the vehicle's 12V loads, which significantly increases the manufacturing cost of the vehicle. In the present disclosure, connecting the 48V power supply platform to the vehicle battery will cause the battery cells in the vehicle battery connected to the 48V power supply platform to consume power faster than the battery cells other than the battery cells connected to the 48V power supply platform, thereby causing the voltage of the vehicle battery to be unbalanced.

[0047] In order to solve the above technical problems, the present disclosure provides a voltage balancing circuit and a vehicle, which includes: a controller, a first motor electronic control component and a first battery module; the first motor electronic control component includes a first motor winding and a first bridge arm converter, the first battery module includes a first battery and a second battery connected in series, and the controller is connected to the first bridge arm converter, and is used to control the first bridge arm converter to charge or discharge the first motor winding when the voltage of the first battery and the voltage of the second battery are unbalanced, so as to balance the voltage of the first battery and the second battery. In this way, the first motor winding can be charged or discharged by controlling the first bridge arm converter to balance the voltage of the first battery and the second battery, thereby improving the service life of the battery and improving the performance of the vehicle.

[0048] Figure 1 is a schematic diagram of a voltage balancing circuit according to an exemplary embodiment of the present disclosure. As shown in Figure 1, the voltage balancing circuit may include: a controller 101, a first motor electronic control component 102 and a first battery module 103; the first motor electronic control component 102 includes a first motor winding 1021 and a first bridge arm converter 1022, the first battery module 103 includes a first battery 1031 and a second battery 1032 connected in series, and the controller 101 is connected to the first bridge arm converter 1022, and is used to charge or discharge the first motor winding 1021 by controlling the first bridge arm converter 1022 when the voltage of the first battery 1031 and the voltage of the second battery 1032 are unbalanced, so as to balance the voltages of the first battery 1031 and the second battery 1032.

[0049] The second battery 1032 is used to connect to the low-voltage electrical equipment 104 to power the low-voltage electrical equipment; the first motor electronic control component 102 may include a motor converter and a motor, the motor converter may include multiple bridge arms, the motor may include multiple windings, the midpoints of the multiple bridge arms are connected to the windings corresponding to the bridge arms, the first motor winding 1021 may be any one winding or any multiple windings in the motor, and the first bridge arm converter 1022 may be any one bridge arm or any multiple bridge arms in the motor converter. The controller 101 can be understood as a BMS (Battery Management System) or a pre-set control device that can be used to control the switch tube in the voltage balancing circuit to turn on the voltage balancing circuit. The low-voltage electrical equipment can be a 12V or 48V electrical equipment. The switch tube can be a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tube, a BJT (Bipolar Junction Transistor) tube, a JFET (Junction Field-Effect Transistor) tube or an IGBT (Insulate-Gate Bipolar Transistor) tube.

[0050] It should be noted that the first battery 1031 and the second battery 1032 can be connected in series to form a first battery module 103, which supplies power to the vehicle load. The first end of the low-voltage electrical equipment 104 can be connected to the positive electrode of the second battery 1032, and the second end of the low-voltage electrical equipment 104 can be connected to the negative electrode of the second battery 1032. The second battery 1032 supplies power to the low-voltage electrical equipment, so that the power consumption of the second battery 1032 is greater than the power consumption of the first battery 1031, resulting in the voltage of the first battery 1031 being greater than the voltage of the second battery 1032. The controller 101 can control the conduction of the first bridge arm converter 1022 to charge or discharge the first motor winding 1021. When the first motor winding 1021 forms a path with the first battery 1031, the first battery 1031 charges the first motor winding 1021. When the first motor winding 1021 forms a path with the second battery 1032, the first motor winding 1021 discharges the power to the second battery 1032.

[0051] Optionally, still taking Figure 1 as an example, the first end of the first motor winding 1021 is connected to the negative pole of the first battery 1031 and the positive pole of the second battery 1032, and the second end of the first motor winding 1021 is connected to the midpoint of the first bridge arm converter 1022; the first end of the first bridge arm converter 1022 is connected to the positive pole of the first battery 1031, and the second end of the first bridge arm converter 1022 is connected to the negative pole of the second battery 1032; the controller 101 is specifically used to control the upper bridge switch tube and the lower bridge switch tube of the first bridge arm converter 1022 to alternately turn on when the voltage of the first battery 1031 and the voltage of the second battery 1032 are unbalanced, so that the first battery 1031 and the second battery 1032 are alternately charged and discharged.

[0052] It should be noted that, when determining that the voltage of the first battery 1031 and the voltage of the second battery 1032 are unbalanced, the controller 101 can control the upper bridge switch tube of the first bridge arm converter 1022 to close and the lower bridge switch tube of the first bridge arm converter 1022 to disconnect, so that a first path is formed between the first battery 1031 and the first motor winding 1021, and the first battery 1031 charges the first motor winding 1021; control the upper bridge switch tube of the first bridge arm converter 1022 to disconnect and the lower bridge switch tube of the first bridge arm converter 1022 to close, so that a second path is formed between the second battery 1032 and the first motor winding 1021, and the first motor winding 1021 charges the second battery 1032, so as to achieve the purpose of balancing the voltage of the first battery 1031 and the voltage of the second battery 1032.

[0053] The above technical solution, by connecting the second battery to the low-voltage electrical equipment, can reduce the use of isolated step-down DC / DC converters and reduce the manufacturing cost of the vehicle. It also controls the first bridge arm converter to charge or discharge the first motor winding so as to balance the voltages of the first battery and the second battery, effectively avoiding the connection of the second battery to the low-voltage electrical equipment, which causes the voltage of the second battery to be unbalanced with the voltage of the first battery, thereby increasing the service life of the battery and helping to improve the performance of the vehicle.

[0054] Optionally, the controller 101 can be specifically used to: in the first timing of the preset voltage balancing timing, control the upper bridge switch tube of the first bridge arm converter 1022 to be turned on, and the first battery 1031, the first motor winding 1021 and the first bridge arm converter 1022 form a first path to enable the first battery 1031 to charge the first motor winding 1021; in the second timing of the preset voltage balancing timing, control the lower bridge switch tube of the first bridge arm converter 1022 to be turned on, and the second battery 1032, the first motor winding 1021 and the first bridge arm converter 1022 form a second path to enable the first motor winding 1021 to charge the second battery 1032.

[0055] The preset voltage balancing timing sequence is used to represent the control timing sequence for the alternating charging and discharging of the first battery 1031 and the second battery 1032 in the voltage balancing circuit. The durations of the first timing sequence and the second timing sequence may be the same or different, and the first timing sequence and the second timing sequence alternate to alternately turn on the upper bridge switch and the lower bridge switch of the first bridge arm converter 1022. For example, the duration of the first timing sequence may be t1, and the duration of the second timing sequence may be t2. Here, t1 may be equal to t2 or may not be equal to t2, and the sum of t1 and t2 may be a period T. During t1 of the first period T1, the preset voltage balancing timing sequence is in the first timing sequence. After t1, the first period T1 enters t2. During t2 of the first period T1, the preset voltage balancing timing sequence is in the second timing sequence. After t2, the preset voltage balancing timing sequence enters t1 of the second period T2, thereby alternating the first and second timing sequences in the preset voltage balancing timing sequence.

[0056] It should be noted that when the controller 101 determines that the voltage of the first battery 1031 and the voltage of the second battery 1032 are unbalanced, the controller 101 controls the upper bridge switch tube and the lower bridge switch tube of the first bridge arm converter 1022 to be alternately turned on in a preset voltage balancing timing. When it is determined that it is in the first timing of the preset voltage balancing timing, the controller 101 controls the upper bridge switch tube of the first bridge arm converter 1022 to be turned on and the lower bridge switch tube to be turned off. When it is determined that it is in the second timing of the preset voltage balancing timing, the controller 101 controls the upper bridge switch tube of the first bridge arm converter 1022 to be turned off and the lower bridge switch tube to be turned on.

[0057] The above technical solution, by connecting the second battery to the low-voltage electrical equipment, can reduce the use of isolated step-down DC / DC converters and reduce the manufacturing cost of the vehicle. It also controls the first bridge arm converter to charge or discharge the first motor winding so as to balance the voltages of the first battery and the second battery, effectively avoiding the connection of the second battery to the low-voltage electrical equipment, which causes the voltage of the second battery to be unbalanced with the voltage of the first battery, thereby increasing the service life of the battery and helping to improve the performance of the vehicle.

[0058] Optionally, the controller 101 can also be used to obtain the voltage of the first battery 1031 and the voltage of the second battery 1032, and when it is determined that the difference between the voltage of the first battery 1031 and the voltage of the second battery 1032 is greater than a first preset voltage threshold, determine that the voltage of the first battery 1031 and the voltage of the second battery 1032 are unbalanced.

[0059] The first preset voltage threshold can be understood as the maximum value of the difference between the voltage of the first battery 1031 and the voltage of the second battery 1032. The first preset voltage threshold can be set based on the allowable voltage difference range between the vehicle batteries. For example, if the allowable voltage difference range between vehicle batteries is 5V to 10V, the first preset voltage threshold can be 4V, 6V, or 8V, but cannot be greater than or equal to 10V.

[0060] It should be noted that the voltage of the first battery 1031 and the voltage of the second battery 1032 can be detected by voltage sensors provided on the first battery 1031 and the second battery 1032. The voltage sensors transmit the detected voltages of the first battery 1031 and the second battery 1032 to the controller 101. The controller 101 receives the voltages of the first battery 1031 and the second battery 1032 and determines whether the voltages of the first battery 1031 and the second battery 1032 are balanced based on the received voltages. The configuration of the voltage sensors for detecting vehicle battery voltages is a common technical means in the art, and there are many implementation methods for sensor configuration in the prior art. The present disclosure does not limit the specific implementation methods of the sensor configuration.

[0061] The above technical solution, by connecting the second battery to the low-voltage electrical equipment, can reduce the use of isolated step-down DC / DC converters and reduce the manufacturing cost of the vehicle. It also controls the first bridge arm converter to charge or discharge the first motor winding so as to balance the voltages of the first battery and the second battery, effectively avoiding the connection of the second battery to the low-voltage electrical equipment, which causes the voltage of the second battery to be unbalanced with the voltage of the first battery, thereby increasing the service life of the battery and helping to improve the performance of the vehicle.

[0062] Figure 2 is a schematic diagram of a voltage balancing circuit according to the embodiment shown in Figure 1. As shown in Figure 2, the voltage balancing circuit may further include: a second motor electronic control component 105 and a second battery module 106, the second motor electronic control component 105 including a second motor winding 1051 and a second bridge arm converter 1052; the controller 101 is also connected to the second bridge arm converter 1052, and is used to control the second bridge arm converter 1052 to charge or discharge the second motor winding 1051 when the voltage of the first battery module 103 and the voltage of the second battery module 106 are unbalanced, so as to balance the voltage of the first battery module 103 and the voltage of the second battery module 106.

[0063] Among them, the second motor electronic control component 105 can include a motor converter and a motor, the motor converter can include multiple bridge arms, the motor can include: multiple windings, the midpoints of the multiple bridge arms are connected to the windings corresponding to the bridge arms, the second motor winding 1051 can be any one winding or any multiple windings in the motor, and the second bridge arm converter 1052 can be any one bridge arm or any multiple bridge arms in the motor converter.

[0064] It should be noted that the first battery module 103 and the second battery module 106 can be connected in series to form a high-voltage battery, which can be used to power the vehicle's high-voltage loads. The controller 101 can control the conduction of the second bridge arm converter 1052 to charge or discharge the second motor winding 1051. When the second motor winding 1051 forms a path with the second battery module 106, the second battery module 106 charges the second motor winding 1051. When the second motor winding 1051 forms a path with the first battery module 103, the second motor winding 1051 discharges the path to the first battery module 103.

[0065] The above technical solution, by connecting the second battery to the low-voltage electrical equipment, can reduce the use of isolated step-down DC / DC converters and reduce the manufacturing cost of the vehicle. It also controls the first bridge arm converter to charge or discharge the first motor winding so as to balance the voltages of the first battery and the second battery, effectively avoiding the connection of the second battery to the low-voltage electrical equipment, which causes the voltage of the second battery to be unbalanced with the voltage of the first battery, thereby increasing the service life of the battery and helping to improve the performance of the vehicle.

[0066] Optionally, still taking Figure 2 as an example, the first end of the second motor winding 1051 is connected to the negative pole of the second battery module 106, and the second end of the second motor winding 1051 is connected to the midpoint of the second bridge arm converter 1052; the first end of the second bridge arm converter 1052 is connected to the positive pole of the second battery module 106, and the second end of the second bridge arm converter 1052 is connected to the negative pole of the first battery module 103; the controller 101 is specifically used to control the upper bridge switch tube and the lower bridge switch tube of the second bridge arm converter 1052 to alternately turn on when the voltage of the first battery module 103 and the voltage of the second battery module 106 are unbalanced, so that the first battery module 103 and the second battery module 106 are alternately charged and discharged.

[0067] It should be noted that the first end of the second bridge arm converter 1052 can be connected to the positive pole of the second battery module 106, and the second end of the second bridge arm converter 1052 can be connected to the second end of the first bridge arm converter 1022, the negative pole of the first battery module 103 and the second end of the low-voltage electrical equipment 104; the first end of the second motor winding 1051 can be connected to the first end of the first bridge arm converter 1022, the positive pole of the first battery module 103 and the negative pole of the second battery module 106, and the second end of the second motor winding 1051 can be connected to the midpoint of the second bridge arm converter 1052. When determining that the voltage of the first battery module 103 and the voltage of the second battery module 106 are unbalanced, the controller 101 can control the upper bridge switch tube of the second bridge arm converter 1052 to close and the lower bridge switch tube to disconnect, so that the second motor winding 1051 and the second battery module 106 form a third path, and the second battery module 106 discharges to the second motor winding 1051; control the upper bridge switch tube of the second bridge arm converter 1052 to disconnect and the lower bridge switch tube to close, so that the second motor winding 1051 and the first battery module 103 form a fourth path, and the second motor winding 1051 charges the first battery module 103.

[0068] The above technical solution, by connecting the second battery to the low-voltage electrical equipment, can reduce the use of isolated step-down DC / DC converters and reduce the manufacturing cost of the vehicle. It also controls the first bridge arm converter to charge or discharge the first motor winding so as to balance the voltages of the first battery and the second battery, effectively avoiding the connection of the second battery to the low-voltage electrical equipment, which causes the voltage of the second battery to be unbalanced with the voltage of the first battery, thereby increasing the service life of the battery and helping to improve the performance of the vehicle.

[0069] Optionally, the controller 101 can be specifically used to: in the third timing of the preset voltage balancing timing, control the upper bridge switch tube of the second bridge arm converter 1052 to be turned on, and the second battery module 106, the second motor winding 1051 and the second bridge arm converter 1052 form a third path to enable the second battery module 106 to charge the second motor winding 1051; in the fourth timing of the preset voltage balancing timing, control the lower bridge switch tube of the second bridge arm converter 1052 to be turned on, and the first battery module 103, the second motor winding 1051 and the second bridge arm converter 1052 form a fourth path to enable the second motor winding 1051 to charge the first battery module 103.

[0070] Among them, the preset voltage balancing timing can be used to characterize the control timing of alternating charging and discharging of the first battery module 103 and the second battery module 106 in the voltage balancing circuit. The duration of the third timing and the fourth timing can be the same as or different from the duration of the first timing and the second timing. The first timing, the second timing, the third timing and the fourth timing are alternately transformed to make the upper bridge switch tube and the lower bridge switch tube of the first bridge arm converter 1022 alternately turned on, and the upper bridge switch tube and the lower bridge switch tube of the second bridge arm converter 1052 are alternately turned on.

[0071] It should be noted that when the controller 101 determines that the voltage of the first battery module 103 and the voltage of the second battery module 106 are unbalanced, the controller 101 controls the upper bridge switch tube and the lower bridge switch tube of the second bridge arm converter 1052 to be alternately turned on in a preset voltage balancing timing. When it is determined that it is in the third timing of the preset voltage balancing timing, the controller 101 controls the upper bridge switch tube of the second bridge arm converter 1052 to be turned on and the lower bridge switch tube to be turned off. When it is determined that it is in the fourth timing of the preset voltage balancing timing, the controller 101 controls the upper bridge switch tube of the second bridge arm converter 1052 to be turned off and the lower bridge switch tube to be turned on.

[0072] The above technical solution, by connecting the second battery to the low-voltage electrical equipment, can reduce the use of isolated step-down DC / DC converters and reduce the manufacturing cost of the vehicle. It also controls the first bridge arm converter to charge or discharge the first motor winding so as to balance the voltages of the first battery and the second battery, effectively avoiding the connection of the second battery to the low-voltage electrical equipment, which causes the voltage of the second battery to be unbalanced with the voltage of the first battery, thereby increasing the service life of the battery and helping to improve the performance of the vehicle.

[0073] Optionally, the controller 101 can also be used to obtain the voltage of the first battery module 103 and the voltage of the second battery module 106, and when it is determined that the difference between the voltage of the second battery module 106 and the voltage of the first battery module 103 is greater than a second preset voltage threshold, it is determined that the voltage of the first battery module 103 and the voltage of the second battery module 106 are unbalanced.

[0074] It should be noted that the voltage of the first battery module 103 and the voltage of the second battery module 106 can be obtained by voltage sensors installed in the first battery module 103 and the second battery module 106. The configuration of voltage sensors for detecting vehicle battery voltages is a common technical means in the art, and there are many implementation methods for sensor configuration in the prior art. The present disclosure does not limit the specific implementation method of the sensor configuration.

[0075] For example, FIG3 is a schematic diagram of another voltage balancing circuit according to an exemplary embodiment of the present disclosure. As shown in FIG3, the first motor winding 1021 may include: a first winding, a second winding, and a third winding, wherein the first end of the first winding, the first end of the second winding, and the first end of the third winding are connected together to form a first neutral point; the first bridge arm converter 1022 may include: a first bridge arm, a second bridge arm, and a third bridge arm, wherein the first end of the first bridge arm, the first end of the second bridge arm, and the first end of the third bridge arm are connected together to form a first bus terminal, and the second end of the first bridge arm, the second end of the second bridge arm, and the third end of the third bridge arm are connected together to form a first bus terminal. The second end and the second end of the third bridge arm are connected together to form a second bus terminal. The second motor winding 1051 may include: a fourth winding, a fifth winding, and a sixth winding. The first end of the fourth winding, the first end of the fifth winding, and the first end of the sixth winding are connected together to form a second neutral point. The second bridge arm converter 1052 may include: a fourth bridge arm, a fifth bridge arm, and a sixth bridge arm. The first end of the fourth bridge arm, the first end of the fifth bridge arm, and the first end of the sixth bridge arm are connected together to form a third bus terminal. The second end of the fourth bridge arm, the second end of the fifth bridge arm, and the second end of the sixth bridge arm are connected together to form a fourth bus terminal. The first neutral point is connected to the negative electrode of the first battery 1031 and the positive electrode of the second battery 1032. The second end of the first winding is connected to the midpoint of the first bridge arm, the second end of the second winding is connected to the midpoint of the second bridge arm, and the second end of the third winding is connected to the midpoint of the third bridge arm. The first bus terminal is connected to the second neutral point, the positive electrode of the first battery module 103, and the negative electrode of the second battery module 106. The second bus terminal is connected to the negative electrode of the first battery module 103, the second end of the low-voltage electrical equipment 104, and the fourth bus terminal. The third bus terminal is connected to the positive electrode of the second battery module 106. The second end of the fourth winding is connected to the midpoint of the fourth bridge arm, the second end of the fifth winding is connected to the midpoint of the fifth bridge arm, and the second end of the sixth winding is connected to the midpoint of the sixth bridge arm.

[0076] Figure 4 is a schematic diagram of current flow in a voltage balancing circuit according to the embodiment shown in Figure 3. As shown in Figure 4, when it is determined that the first timing sequence is in the preset voltage balancing timing sequence, the controller 101 controls the upper bridge switch tube of the first bridge arm, the upper bridge switch tube of the second bridge arm, and the upper bridge switch tube of the third bridge arm to be closed, and the lower bridge switch tube of the first bridge arm, the lower bridge switch tube of the second bridge arm, and the lower bridge switch tube of the third bridge arm to be disconnected, the first battery 1031 forms a loop with the first winding, the second winding, and the third winding, and the first battery 1031 discharges to the first winding, the second winding, and the third winding.

[0077] It should be noted that when it is determined that the first timing sequence is the preset voltage balancing timing sequence, at least one of the upper bridge switch tube of the first bridge arm, the upper bridge switch tube of the second bridge arm, and the upper bridge switch tube of the third bridge arm can be closed.

[0078] Figure 5 is a current flow diagram of another voltage balancing circuit according to the embodiment shown in Figure 3. As shown in Figure 5, when it is determined that the second timing sequence is in the preset voltage balancing timing sequence, the controller 101 controls the upper bridge switch tube of the first bridge arm, the upper bridge switch tube of the second bridge arm, and the upper bridge switch tube of the third bridge arm to be closed, and the lower bridge switch tube of the first bridge arm, the lower bridge switch tube of the second bridge arm, and the lower bridge switch tube of the third bridge arm to be disconnected, and the first winding, the second winding, and the third winding charge the second battery 1032.

[0079] It should be noted that when it is determined that the second timing sequence is in the preset voltage balancing timing sequence, at least one of the lower bridge switch tube of the first bridge arm, the upper bridge switch tube of the second bridge arm, and the upper bridge switch tube of the third bridge arm can be closed.

[0080] Figure 6 is a current flow diagram of another voltage balancing circuit according to the embodiment shown in Figure 3. As shown in Figure 6, when it is determined that the third timing of the preset voltage balancing timing is in progress, the controller 101 controls the upper bridge switch tube of the fourth bridge arm, the upper bridge switch tube of the fifth bridge arm, and the upper bridge switch tube of the sixth bridge arm to close, and the lower bridge switch tube of the fourth bridge arm, the lower bridge switch tube of the fifth bridge arm, and the lower bridge switch tube of the sixth bridge arm to disconnect, and the second battery module 106 discharges to the fourth winding, the fifth winding, and the sixth winding.

[0081] It should be noted that, when it is determined that the third timing sequence of the preset voltage balancing timing sequence is in progress, at least one of the upper bridge switch tubes of the fourth bridge arm, the fifth bridge arm, and the sixth bridge arm can be closed.

[0082] Figure 7 is a current flow diagram of another voltage balancing circuit according to the embodiment shown in Figure 3. As shown in Figure 7, when it is determined that the fourth timing of the preset voltage balancing timing is in progress, the controller 101 controls the upper bridge switch tube of the fourth bridge arm, the upper bridge switch tube of the fifth bridge arm, and the upper bridge switch tube of the sixth bridge arm to be disconnected, and the lower bridge switch tube of the fourth bridge arm, the lower bridge switch tube of the fifth bridge arm, and the lower bridge switch tube of the sixth bridge arm to be closed, and the fourth winding, the fifth winding, and the sixth winding charge the first battery module 103.

[0083] It should be noted that when it is determined that the fourth timing sequence is the preset voltage balancing timing sequence, at least one of the lower bridge switch tubes of the fourth bridge arm, the fifth bridge arm, and the sixth bridge arm can be closed.

[0084] The above technical solution, by connecting the second battery to the low-voltage electrical equipment, can reduce the use of isolated step-down DC / DC converters and reduce the manufacturing cost of the vehicle. It also controls the first bridge arm converter to charge or discharge the first motor winding so as to balance the voltages of the first battery and the second battery, effectively avoiding the connection of the second battery to the low-voltage electrical equipment, which causes the voltage of the second battery to be unbalanced with the voltage of the first battery, thereby increasing the service life of the battery and helping to improve the performance of the vehicle.

[0085] FIG8 is a schematic diagram of a voltage balancing circuit according to the embodiment shown in FIG2 . As shown in FIG8 , the voltage balancing circuit may further include: a first transfer switch Q1, wherein a first end of the first transfer switch Q1 may be connected to the first end of the first motor winding 1021, and a second end of the first transfer switch Q1 may be connected to the negative electrode of the first battery 1031 and the positive electrode of the second battery 1032; and the controller 101 may further be connected to the first transfer switch Q1 to control the first transfer switch to be closed before controlling the upper and lower bridge switches of the first arm converter to alternately turn on, thereby causing the first and second batteries to alternately charge and discharge.

[0086] Among them, the first conversion switch can be a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tube, a BJT (Bipolar Junction Transistor) tube, a JFET (Junction Field-Effect Transistor) tube or an IGBT (Insulate-Gate Bipolar Transistor) tube.

[0087] It should be noted that the controller 101 can be configured to control the first conversion switch Q1 to be open when the first motor winding 1021 is in a driving mode, and to control the first conversion switch Q1 to be closed when the first motor winding 1021 is in a voltage balancing mode, thereby conducting the first bridge arm converter 1022, the first motor winding 1021, and the first battery module 103. The driving mode may be a mode in which the first motor winding 1021 is used to convert electrical energy into mechanical energy to drive the vehicle, while the voltage balancing mode may be a mode in which the first motor winding 1021 is used to store electrical energy and transmit the stored electrical energy to the second battery 1032 to balance the voltage of the first battery 1031 with the voltage of the second battery 1032.

[0088] The above technical solution, by connecting the second battery to the low-voltage electrical equipment, can reduce the use of isolated step-down DC / DC converters and reduce the manufacturing cost of the vehicle. It also controls the first bridge arm converter to charge or discharge the first motor winding so as to balance the voltages of the first battery and the second battery, effectively avoiding the connection of the second battery to the low-voltage electrical equipment, which causes the voltage of the second battery to be unbalanced with the voltage of the first battery, thereby increasing the service life of the battery and helping to improve the performance of the vehicle.

[0089] Optionally, still taking Figure 8 as an example, the voltage balancing circuit may further include: a second conversion switch Q2, wherein the first end of the second conversion switch Q2 may be connected to the first end of the second motor winding 1051, and the second end of the second conversion switch Q2 may be connected to the first end of the first bridge arm converter 1022, the positive electrode of the first battery module 103, and the negative electrode of the second battery module 106; the controller 101 may further be connected to the second conversion switch Q2, and be used to control the second conversion switch to be closed before controlling the upper bridge switch tube and the lower bridge switch tube of the second bridge arm converter to be alternately turned on, so that the first battery module and the second battery module are alternately charged and discharged.

[0090] Among them, the second conversion switch can be a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tube, a BJT (Bipolar Junction Transistor) tube, a JFET (Junction Field-Effect Transistor) tube or an IGBT (Insulate-Gate Bipolar Transistor) tube.

[0091] It should be noted that the controller 101 can be configured to control the second conversion switch Q2 to be open when the second motor winding 1051 is in the driving mode, and to control the second conversion switch Q2 to be closed when the second motor winding 1051 is in the voltage balancing mode, thereby connecting the second bridge arm converter 1052, the second motor winding 1051, and the second battery module 106, or connecting the second bridge arm converter 1052, the second motor winding 1051, and the first battery module 103. The driving mode can be a mode in which the second motor winding 1051 converts electrical energy into mechanical energy to drive the vehicle, and the voltage balancing mode can be a mode in which the second motor winding 1051 stores electrical energy and transmits the stored electrical energy to the second battery 1032 to balance the voltage of the first battery module 103 with the voltage of the second battery module 106.

[0092] For example, FIG9 is a schematic diagram of a voltage balancing circuit according to the embodiment shown in FIG3 . As shown in FIG9 , a first end of the first transfer switch Q1 is connected to the first neutral point, and a second end of the first transfer switch Q1 is connected to the negative electrode of the first battery 1031 and the positive electrode of the second battery 1032. A first end of the second transfer switch Q2 is connected to the second neutral point, and a second end of the second transfer switch Q2 is connected to the second bus terminal, the positive electrode of the first battery module 103, and the negative electrode of the second battery module 106. When the first conversion switch Q1 is turned on, the first winding in the first motor winding 1021, the first bridge arm of the first bridge arm converter 1022 and the first battery module 103, the second winding in the first motor winding 1021, the second bridge arm of the first bridge arm converter 1022 and the first battery module 103, and the third winding in the first motor winding 1021, the third bridge arm of the first bridge arm converter 1022 and the first battery module 103 can form one or more paths so that the voltage balancing circuit can achieve voltage balancing between the first battery and the second battery; when the second conversion switch Q2 is turned on, the first winding in the second motor winding 1051, the first bridge arm of the second bridge arm converter 1052 and the second battery module 106, the second winding in the first motor winding 1021 , the second bridge arm of the second bridge arm converter 1052 and the second battery module 106, and the third winding in the second motor winding 1051, the third bridge arm of the second bridge arm converter 1052 and the second battery module 106 form one or more paths, or the first winding in the second motor winding 1051, the first bridge arm of the second bridge arm converter 1052 and the first battery module 103, the second winding in the first motor winding 1021, the second bridge arm of the second bridge arm converter 1052 and the first battery module 103, and the third winding in the second motor winding 1051, the third bridge arm of the second bridge arm converter 1052 and the first battery module 103 form one or more paths, so that the voltage balancing circuit realizes voltage balancing of the first battery module 103 and the second battery module 106.

[0093] The above technical solution, by connecting the second battery to the low-voltage electrical equipment, can reduce the use of isolated step-down DC / DC converters and reduce the manufacturing cost of the vehicle. It also controls the first bridge arm converter to charge or discharge the first motor winding so as to balance the voltages of the first battery and the second battery, effectively avoiding the connection of the second battery to the low-voltage electrical equipment, which causes the voltage of the second battery to be unbalanced with the voltage of the first battery, thereby increasing the service life of the battery and helping to improve the performance of the vehicle.

[0094] FIG10 is a block diagram of a vehicle according to an exemplary embodiment of the present disclosure. As shown in FIG10 , the vehicle includes the voltage balancing circuit described in FIG1 to FIG9 .

[0095] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0096] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0097] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A voltage equalization circuit (100), characterized in that: The voltage balancing circuit comprises: a controller (101), a first motor electronic control component (102) and a first battery module (103); the first motor electronic control component (102) comprises a first motor winding (1021) and a first bridge arm converter (1022); the first battery module (103) comprises a first battery (1031) and a second battery (1032) connected in series; The controller (101) is connected to the first bridge arm converter (1022) and is used to charge or discharge the first motor winding (1021) by controlling the first bridge arm converter (1022) when the voltage of the first battery (1031) and the voltage of the second battery (1032) are unbalanced, so as to balance the voltages of the first battery (1031) and the second battery (1032).

2. The voltage equalization circuit (100) according to claim 1, characterized in that: A first end of the first motor winding (1021) is connected to the negative electrode of the first battery (1031) and the positive electrode of the second battery (1032), and a second end of the first motor winding (1021) is connected to the midpoint of the first bridge arm converter (1022); The first end of the first bridge arm converter (1022) is connected to the positive electrode of the first battery (1031), and the second end of the first bridge arm converter (1022) is connected to the negative electrode of the second battery (1032); The controller (101) is specifically used to control the upper bridge switch tube and the lower bridge switch tube of the first bridge arm converter (1022) to be alternately turned on when the voltage of the first battery (1031) and the voltage of the second battery (1032) are unbalanced, so that the first battery (1031) and the second battery (1032) are alternately charged and discharged.

3. The voltage equalization circuit (100) according to claim 1 or 2, characterized in that: The voltage balancing circuit further comprises: a second motor electronic control component (105) and a second battery module (106); the second motor electronic control component (105) comprises a second motor winding (1051) and a second bridge arm converter (1052); The controller (101) is also connected to the second bridge arm converter (1052) and is used to charge or discharge the second motor winding (1051) by controlling the second bridge arm converter (1052) when the voltage of the first battery module (103) and the voltage of the second battery module (106) are unbalanced, so as to balance the voltage of the first battery module (103) and the voltage of the second battery module (106).

4. The voltage equalization circuit (100) according to claim 3, characterized in that: A first end of the second motor winding (1051) is connected to the negative electrode of the second battery module (106), and a second end of the second motor winding (1051) is connected to the midpoint of the second bridge arm converter (1052); The first end of the second bridge arm converter (1052) is connected to the positive electrode of the second battery module (106), and the second end of the second bridge arm converter (1052) is connected to the negative electrode of the first battery module (103); The controller (101) is specifically used to control the upper bridge switch tube and the lower bridge switch tube of the second bridge arm converter (1052) to be alternately turned on when the voltage of the first battery module (103) and the voltage of the second battery module (106) are unbalanced, so that the first battery module (103) and the second battery module (106) are alternately charged and discharged.

5. The voltage equalization circuit (100) according to any one of claims 1 to 4, characterized in that: The controller (101) is specifically used for: At a first timing of a preset voltage balancing timing, the upper bridge switch tube of the first bridge arm converter (1022) is controlled to be turned on, so that the first battery (1031), the first motor winding (1021) and the first bridge arm converter (1022) form a first path, so that the first battery (1031) charges the first motor winding (1021); In a second timing sequence of the preset voltage balancing timing sequence, the lower bridge switch tube of the first bridge arm converter (1022) is controlled to be turned on, and the second battery (1032), the first motor winding (1021) and the first bridge arm converter (1022) form a second path, so that the first motor winding (1021) charges the second battery (1032); The preset voltage balancing timing is used to characterize the control timing of alternately charging and discharging the first battery (1031) and the second battery (1032) in the voltage balancing circuit.

6. The voltage equalization circuit (100) according to any one of claims 1 to 5, characterized in that: The voltage balancing circuit further comprises: a first conversion switch (Q1), wherein a first end of the first conversion switch (Q1) is connected to a first end of the first motor winding (1021), and a second end of the first conversion switch (Q1) is connected to a negative electrode of the first battery (1031) and a positive electrode of the second battery (1032); The controller (101) is also connected to the first conversion switch (Q1) and is used to control the upper bridge switch tube and the lower bridge switch tube of the first bridge arm converter (1022) to be alternately turned on, so that the first battery (1031) and the second battery (1032) are alternately charged and discharged, and then control the first conversion switch (Q1) to be closed.

7. The voltage equalization circuit (100) according to any one of claims 1 to 6, characterized in that: The controller (101) is further used to obtain the voltage of the first battery (1031) and the voltage of the second battery (1032), and when it is determined that the difference between the voltage of the first battery (1031) and the voltage of the second battery (1032) is greater than a first preset voltage threshold, determine that the voltage of the first battery (1031) and the voltage of the second battery (1032) are unbalanced.

8. The voltage equalization circuit (100) according to claim 3 or 4, characterized in that: The controller (101) is specifically used for: At a third timing of a preset voltage balancing timing, the upper bridge switch tube of the second bridge arm converter (1052) is controlled to be turned on, so that the second battery module (106), the second motor winding (1051) and the second bridge arm converter (1052) form a third path, so that the second battery module (106) charges the second motor winding (1051); At a fourth timing of the preset voltage balancing timing, the lower bridge switch tube of the second bridge arm converter (1052) is controlled to be turned on, so that the first battery module (103), the second motor winding (1051) and the second bridge arm converter (1052) form a fourth path, so that the second motor winding (1051) charges the first battery module (103); The preset voltage balancing timing is used to characterize the control timing of the alternating charging and discharging of the first battery module (103) and the second battery module (106) in the voltage balancing circuit.

9. The voltage equalization circuit (100) according to claim 3, 4 or 8, characterized in that: The controller (101) is further used to obtain the voltage of the first battery module (103) and the voltage of the second battery module (106), and when it is determined that the difference between the voltage of the second battery module (106) and the voltage of the first battery module (103) is greater than a second preset voltage threshold, determine that the voltage of the first battery module (103) and the voltage of the second battery module (106) are unbalanced.

10. The voltage equalization circuit (100) according to claim 3, 4, 8 or 9, characterized in that: The voltage equalization circuit further comprises: a second conversion switch (Q2), wherein a first end of the second conversion switch (Q2) is connected to a first end of the second motor winding (1051), and a second end of the second conversion switch (Q2) is connected to a first end of the first bridge arm converter (1022), a positive electrode of the first battery module (103), and a negative electrode of the second battery module (106); The controller (101) is also connected to the second conversion switch (Q2) and is used to control the upper bridge switch tube and the lower bridge switch tube of the second bridge arm converter (1052) to be alternately turned on, so that the first battery module (103) and the second battery module (106) are alternately charged and discharged, and then control the second conversion switch (Q2) to be closed.

11. The voltage equalization circuit (100) according to any one of claims 1 to 10, characterized in that: The second battery (1032) is used to connect to a low-voltage electrical device (104) to supply power to the low-voltage electrical device (104).

12. A vehicle (200), characterized in that: The vehicle comprises: a voltage equalization circuit (100) as described in any one of claims 1 to 11 above.

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