Boost system, boost method, vehicle and program product for power battery

Abstract

The invention relates to a boost system for a power battery, the boost system at least comprises a switch module and a control module, and the switch module, a coil of a motor and an inverter circuit of a motor driver form a boost circuit. The input side of the switch module is connected with the power supply module, the output side of the switch module is connected with a coil of the motor, and the control module can control the coil of the motor at least by controlling the switch module, so that the power battery can be charged in a boosting mode. The invention also relates to a boosting method for a power battery, a vehicle and a computer program product. According to the invention, by multiplexing the inductive reactance of the motor stator winding, various boost charging modes of the charging voltage are favorably realized.

Description

Technical Field

[0001] The present application relates to a voltage boosting system for a power battery, a voltage boosting method for a power battery, a vehicle and a computer program product. Background Art

[0002] With the rapid development and popularization of electric vehicles, the charging technology of electric vehicle power batteries has become increasingly important. On the one hand, charging technology needs to meet different needs, and on the other hand, electric vehicle power batteries need to adapt or be compatible with charging piles, especially in terms of voltage amplitude.

[0003] At present, there are cases where the power batteries of electric vehicles are not compatible with the charging piles that have been built in large quantities. In particular, in some cases, the output voltage of the charging pile needs to be boosted to achieve adaptation. Summary of the invention

[0004] The object of the present application is to provide a boost charging solution for a power battery, so that when the available supply voltage is lower than the charging voltage required by the power battery, the supply voltage is boosted to the charging voltage.

[0005] This object is solved by a boosting system for a power battery, a boosting method for a power battery, a vehicle and a computer program product. Preferred embodiments of the present application will be described in detail below.

[0006] According to a first aspect of the present application, a boost system for a power battery is proposed, the boost system comprising at least a switch module and a control module, the switch module, the coil of the motor and the inverter circuit of the motor driver form a boost circuit, the switch module is connected to the power supply module on the input side and to the coil of the motor on the output side, the control module can control the coil of the motor at least by controlling the switch module, so that the power battery can be boosted and charged.

[0007] In the present application, the boost circuit is formed by reusing the motor inductance to achieve compatibility with power supply modules that provide lower voltages (such as charging piles). Here, there is no need to set up additional complex components for boosting (such as additional inductors), and there is no need to change the series-parallel connection mode of the power battery itself.

[0008] In the present application, the stator winding of the motor does not form a star connection at one end, but is respectively connected to a switch module or a switch matrix arranged inside or outside the motor and then led out via a switch in the switch module or the switch matrix. Here, the control of the corresponding coil or winding is achieved in a flexible manner by controlling the switch in the switch module or the switch matrix (closing or opening). Here, a variety of boost charging modes are achieved in a flexible manner by the coordinated control of the switch module and the three-phase inverter, so that the provided supply voltage can be matched with the required charging voltage when necessary.

[0009] According to a preferred embodiment of the present application, the switch module includes an input end on the input side and multiple output ends on the output side, the input end is connected to the power supply module, and corresponding output ends among the multiple output ends are respectively connected to corresponding coils among the coils of the motor.

[0010] According to a preferred embodiment of the present application, the switch module includes a plurality of switches, wherein each of the plurality of output ends of the switch module is respectively connected to at least one switch of the plurality of switches, and the control module can control at least one coil of the coils of the motor by at least controlling the at least one switch of the plurality of switches of the switch module, so that the power battery can be boost charged in a variable manner, wherein the input end of the switch module is connected to at least one switch of the plurality of switches, and the control module can stop boost charging of the power battery by at least disconnecting the at least one switch of the plurality of switches of the switch module.

[0011] According to a preferred embodiment of the present application, the switch module includes three output terminals, the coil of the motor is constructed as a three-phase coil, the inverter circuit of the motor driver is constructed as a three-phase inverter, each phase coil of the three-phase coil is connected to one of the three output terminals of the switch module at one end and is connected to the midpoint of the three-phase bridge arm of the three-phase inverter at the other end, and the control module can control the coil of the motor by controlling the switch module and the three-phase inverter, so that the power battery can be boosted and charged.

[0012] According to a preferred embodiment of the present application, the switch module includes a first switch, a second switch and a third switch, and the first switch, the second switch and the third switch are used to connect the first phase coil, the second phase coil and the third phase coil of the three-phase coil, and the third switch is used to connect the power supply module. Alternatively, according to a preferred embodiment of the present application, the switch module includes a first switch, a second switch, a third switch and a fourth switch, and the first switch, the second switch and the third switch are used to connect the first phase coil, the second phase coil and the third phase coil of the three-phase coil, and the fourth switch is used to connect the power supply module.

[0013] Advantageously, one or more of the three-phase coils can be controlled or switched in individually or jointly. In the context of the present application, in addition to connection and switching in the general sense, "switch-in", i.e. "switch-in" of a coil, can also be understood as the coil storing energy in one phase and releasing energy or contributing to the voltage increase in another phase.

[0014] According to a preferred implementation of the present application, the control module can implement at least one of the following boost charging modes: three-phase parallel charging, three-phase series charging, two-phase parallel charging and another phase series charging, single-phase charging and two-phase parallel charging.

[0015] Advantageously, various boost charging modes are realized by means of the switches in the switch module and the power switch units of the bridge arms in the three-phase inverter.

[0016] According to a preferred embodiment of the present application, the control module can be configured to close all switches of the switch module, close all first power switch units of the three-phase bridge arm of the three-phase inverter in the first stage, and disconnect all first power switch units of the three-phase bridge arm of the three-phase inverter and close all second power switch units of the three-phase bridge arm of the three-phase inverter in the second stage. Here, the first stage can also be called the coil inductance charging stage, and the second stage can also be called the boost charging stage or the boost output stage. In the second stage, the power battery is boosted and charged with the boosted voltage.

[0017] Advantageously, a three-phase parallel charging mode is implemented.

[0018] According to a preferred embodiment of the present application, the control module can be configured to close at least two of the first switch, the second switch and the third switch in the switch module and close the second power switch units of two phase bridge arms in the three-phase bridge arms of the three-phase inverter, and in the first stage, close the first power switch unit of another phase bridge arm in the three-phase bridge arms of the three-phase inverter, and in the second stage, disconnect the first power switch unit of another phase bridge arm in the three-phase bridge arms of the three-phase inverter and close the second power switch unit of another phase bridge arm in the three-phase bridge arms of the three-phase inverter.

[0019] Advantageously, a three-phase series charging mode is implemented.

[0020] According to a preferred embodiment of the present application, the control module can be configured to close at least the first switch, the second switch and the third switch in the switch module, and in the first stage, close the first power switch unit of one of the three-phase bridge arms of the three-phase inverter and close the second power switch units of the other two of the three-phase bridge arms of the three-phase inverter; in the second stage, disconnect the first power switch unit of one of the three-phase bridge arms of the three-phase inverter and disconnect the second power switch units of the other two of the three-phase bridge arms of the three-phase inverter, and close the second power switch unit of one of the three-phase bridge arms of the three-phase inverter.

[0021] Advantageously, a charging mode of two phases in parallel and another phase in series is implemented.

[0022] According to a preferred embodiment of the present application, the control module can be configured to close at least one of the first switch, the second switch and the third switch in the switch module, and in the first stage, close the first power switch unit of the corresponding one-phase bridge arm in the three-phase bridge arm of the three-phase inverter, and in the second stage, disconnect the first power switch unit of the corresponding one-phase bridge arm in the three-phase bridge arm of the three-phase inverter and close the second power switch unit of the corresponding one-phase bridge arm in the three-phase bridge arm of the three-phase inverter.

[0023] Advantageously, a single-phase charging mode is achieved.

[0024] According to a preferred embodiment of the present application, the control module can be configured to close at least two switches among the first switch, the second switch and the third switch in the switch module, and in the first stage, close the first power switch units of the corresponding two-phase bridge arms in the three-phase bridge arms of the three-phase inverter; in the second stage, disconnect the first power switch units of the corresponding two-phase bridge arms in the three-phase bridge arms of the three-phase inverter and close the second power switch units of the corresponding two-phase bridge arms in the three-phase bridge arms of the three-phase inverter.

[0025] Advantageously, a two-phase parallel charging mode is implemented.

[0026] According to a preferred implementation of the present application, the control module can be configured to select the control of the switch module and the inverter circuit of the motor driver based on the supply voltage of the power supply module.

[0027] Advantageously, the optimal boost charging mode is selected according to the supply voltage of the power supply module, that is, in particular, the required boost factor.

[0028] According to a preferred implementation of the present application, the ratio of the power supply voltage of the power supply module to the charging voltage required by the power battery is determined, and when the ratio is greater than a first threshold, parallel charging, such as three-phase parallel charging, is selected; when the ratio is less than a second threshold, series charging, such as three-phase series charging, is selected.

[0029] Here, it can be understood that the ratio, the first threshold, and the second threshold are values ​​less than 1 and the first threshold is greater than or equal to the second threshold. Advantageously, when the supply voltage is large or the boost factor is small, parallel charging is preferred to obtain a large charging current and / or charging power, and when the supply voltage is small or the boost factor is large, series charging is preferred to obtain a large boost effect.

[0030] According to a preferred implementation of the present application, the control module can be configured to alternately control the switch module and the inverter circuit of the motor driver.

[0031] Advantageously, an equalizing effect can be achieved.

[0032] According to a second aspect of the present application, a voltage boosting method for a power battery is provided, and the voltage boosting method is applied to a voltage boosting system according to the present application.

[0033] According to a third aspect of the present application, a vehicle is provided, wherein the vehicle is equipped with a boost system according to the present application.

[0034] According to a fourth aspect of the present application, a computer program product, such as a computer-readable program medium, is proposed, wherein the computer program product includes or stores computer program instructions, and when the computer program instructions are executed by a processor or a controller, the computer program instructions can at least partially execute the boosting method according to the present application.

[0035] Here, the features and details described in conjunction with the boosting system for a power battery according to the present application also apply to the boosting method for a power battery according to the present application, the vehicle according to the present application and the computer program product according to the present application, and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present application is described in more detail below with reference to the accompanying drawings. The accompanying drawings show:

[0037] Figure 1 A schematic block diagram of a boost system according to an exemplary embodiment of the present application is shown;

[0038] Figure 2 A schematic structural diagram showing an exemplary embodiment of a boost system according to the present application;

[0039] Figure 3(a) to Figure 3(c) A schematic structural diagram showing an exemplary embodiment of a switch module of a boost system according to the present application;

[0040] Figure 4 A schematic flow chart showing an exemplary embodiment of a voltage boosting method according to the present application;

[0041] Figure 5 A schematic diagram showing an exemplary embodiment of a vehicle according to the present application; and

[0042] Figure 6 A schematic diagram showing an exemplary embodiment of a computer program product according to the present application. DETAILED DESCRIPTION

[0043] In order to make the technical tasks, technical solutions and technical effects of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and exemplary embodiments. It should be understood that the exemplary embodiments described here are only for explanation and not for limitation.

[0044] exist Figure 1 2 is a schematic block diagram of a boost system 100 according to an exemplary embodiment of the present application.

[0045] The boost system 100 includes at least a switch module 102 and a control module 108 .

[0046] The boost system 100 is electrically connected to the coil 104 of the motor and the inverter circuit 106 of the motor driver and / or connected through signal technology, or the boost system 100 includes the coil 104 of the motor and / or the inverter circuit 106 of the motor driver (in Figure 1 Only this case is shown in Figure 1 As shown in FIG. 1 , the switch module 102 , the coil 104 of the motor and the inverter circuit 106 of the motor driver form a boost circuit.

[0047] The boost system 100 is coupled to a power supply module 110 on one side or the boost system 100 includes a power supply module 110 (on the Figure 1The boost system 100 is coupled to the power battery 120 on the other side or the boost system 100 includes the power battery 120 (in Figure 1 Here, the power supply module 110 is used to provide power to the power battery 120. For example, the power provided by the power supply module 110 can be direct current provided by a DC charging pile, or can be direct current output by a single-phase or three-phase AC charging pile after rectification, or can be electric energy generated by a fuel cell, and so on.

[0048] As in Figure 1 As schematically shown in FIG. 1 , the switch module 102 is connected to the power supply module 110 on the input side and to the coil 104 of the motor on the output side. Here, the coil 104 of the motor is not connected in a star shape at one end as in the prior art, but is connected to the switch module 102 in an at least partially separated form and then led out via the switch in the switch module or the switch matrix. Here, by controlling the switches in the switch module or the switch matrix (closing or opening), the corresponding coils or windings can be controlled in a flexible manner, so that the power battery can be boosted and charged in a variety of boost charging modes.

[0049] Exemplarily, the switch module 102 includes an input terminal on the input side and includes a plurality of output terminals on the output side (the plurality of output terminals are Figure 1 The input end is connected to the power supply module 110, and the corresponding output ends of the plurality of output ends are respectively connected to the corresponding coils of the coils 104 of the motor. Thus, by controlling (closing or opening) the switches in the switch module or the switch matrix, a boost charging mode such as series charging, parallel charging, or series-parallel combined charging can be realized.

[0050] Exemplarily, the switch module 102 includes a plurality of switches. Here, each of the plurality of output terminals of the switch module 102 is respectively connected to at least one of the plurality of switches, so that at least one of the coils 104 of the motor can be manipulated by manipulating at least one of the plurality of switches of the switch module 102, that is, it is possible to control which or which coils of the coils 104 of the motor are connected in series, in parallel, or in a combination of series and parallel by manipulating at least one of the plurality of switches of the switch module 102, so that the power battery 120 can be boosted and charged in a flexible and variable manner. Here, the input terminal of the switch module 102 is connected to at least one of the plurality of switches, so that the boost charging of the power battery 120 can be stopped at least by disconnecting at least one of the plurality of switches of the switch module 102. This occurs, for example, during normal driving of the vehicle, in which case the coils 104 of the motor maintain a star connection via the switch module 102 and the motor is disconnected from the power supply module 110.

[0051] As in Figure 1 As schematically shown in FIG. 1 , the coil 104 of the motor is arranged between the switch module 102 and the motor driver or the inverter circuit 106 of the motor driver. As described above, the coil 104 of the motor is connected to the switch module 102 at one end. Specifically and exemplarily, each phase coil of the coil 104 of the motor (i.e., for example, the motor stator winding) is respectively connected to a corresponding output end of the multiple output ends of the switch module 102 at one end. The coil 104 of the motor is connected to the inverter circuit 106 of the motor driver at the other end. Specifically and exemplarily, each phase coil of the coil 104 of the motor (i.e., for example, the motor stator winding) is respectively connected to the midpoint of the bridge arm of the inverter circuit 106 of the motor driver at the other end. It can be understood that the coil 104 of the motor does not form a star connection at the end where it is connected to the switch module 102. Accordingly, by manipulating the switch module 102, i.e., one or more switches of the switch module 102, the winding or coil 104 associated with the one or more switches is connected to the circuit or connected to the power supply module, i.e., the winding or coil 104 associated with the corresponding one or more switches of the switch module 102 is manipulated individually or jointly for the required charging method.

[0052] As in Figure 1 As schematically shown in FIG. 1 , the inverter circuit 106 of the motor driver is arranged between the motor or the coil 104 of the motor and the power battery 120. As described above, specifically and exemplarily, the inverter circuit 106 of the motor driver is connected to each phase coil of the coil 104 of the motor at the midpoint of its bridge arm on one side and is coupled to the power battery 120 on the other side.

[0053] The control module is configured to be able to control the switch module 102 in the following manner: the boost system 100 can control or access the coil of the motor, so as to boost and charge the power battery. Further, the control module 108 is configured to control the switch module 102 and the inverter circuit 106 of the motor driver in the following manner: the boost system 100 can receive the supply voltage from the power supply module 110 and output direct current, especially the output voltage (also referred to as charging voltage) boosted relative to the supply voltage, so as to boost and charge the power battery 120.

[0054] The control module 108 can be connected to at least one of the power battery 120, the switch module 102, the motor or the motor coil 104, the motor driver or the inverter circuit 106 of the motor driver, and the power supply module 120. Figure 1 As schematically shown by the straight line and broken line connected to the control module 108, the control module 108 is connected to the power battery 120, the switch module 102, the motor or the coil 104 of the motor, the motor driver or the inverter circuit 106 of the motor driver, and the power supply module 120. The control module 108 can detect the voltage of the power supply module 110. In addition, the control module 108 can control the closing and opening of multiple switches in the switch module 102. In addition, the control module 108 can detect the current of the coil 104 of the motor. In addition, the control module 108 can control the closing and opening of each power switch unit of each bridge arm of the inverter circuit 106 of the motor driver. In addition, the control module 108 can detect the voltage of the power battery 120 and optionally the current and temperature of the power battery 120. For example, the control module 108 can be or include a controller of a vehicle controller, a motor controller and / or a BMS; in other words, all or part of the functions of the control module 108 can be performed by a controller of a vehicle controller, a motor controller and / or a BMS. For example, alternatively, the control module 108 may also be a separate controller, and for example, may be communicatively connected to a vehicle controller, a motor controller, and / or a controller of a BMS. Here, the control module 108 controls the on and off of the switch in the switch module 102 and the power switch unit in the inverter circuit 106 of the motor driver according to parameters such as voltage, current, temperature, and power obtained from the power supply module 110, the switch module 102, the coil 104 of the motor, the inverter circuit 106 of the motor driver, and the optional power battery 120, so as to realize different charging modes.

[0055] In one embodiment, the control module 108 can be configured to select the control of the switch module 102 and the inverter circuit 106 of the motor driver based on the supply voltage of the power supply module 110. Preferably, in one embodiment, the ratio of the supply voltage of the power supply module 110 to the charging voltage required by the power battery 120 is determined; in other words, the boost coefficient from the supply voltage to the charging voltage is determined. Exemplarily, when the ratio is greater than a first threshold or the boost coefficient is less than a value (e.g., the inverse of the first threshold), parallel charging, such as three-phase parallel charging, is selected, and when the ratio is less than a second threshold smaller than the first threshold or the boost coefficient is greater than another value (e.g., the inverse of the second threshold), series charging, such as three-phase series charging, is selected.

[0056] In the following, a three-phase AC motor is used as an example for explanation. However, it should be noted that the present application is not limited thereto, and the contents described herein are merely exemplary and not restrictive.

[0057] exist Figure 2 A schematic structural diagram of an exemplary embodiment of a boost system 100 according to the present application is shown in . Here, the switch module 102 includes three output terminals, the coil 104 of the motor is configured as a three-phase coil, and the inverter circuit 106 of the motor driver is configured as a three-phase inverter. Here, each phase coil of the three-phase coil is connected to one of the three output terminals of the switch module 102 at one end and is connected to the midpoint of the three-phase bridge arm of the three-phase inverter at the other end. The control module 108 can control the coil 104 of the motor by controlling the switch module 102 and the three-phase inverter, so that the power battery 120 can be boosted and charged. Here, for the convenience of description, other components are not shown, but only the three-phase inverter 106, the three-phase coil 104 of the three-phase AC motor and the switch module 102 are shown.

[0058] Specifically, the three-phase inverter 106 includes a first power switch unit SW1, a second power switch unit SW2, a third power switch unit SW3, a fourth power switch unit SW4, a fifth power switch SW5 and a sixth power switch SW6, wherein each power switch unit is equipped with its own diode, wherein the control end of each power switch unit is connected to the control module 108, wherein the input ends of the first power switch unit SW1, the second power switch unit SW2 and the third power switch unit SW3 are connected in common and form a first end of the three-phase inverter 106 (such as in Figure 2 As shown in , the first end is respectively coupled with the negative end IN- of the power supply module 110 and the negative end OUT- of the power battery 120), and the output ends of the fourth power switch unit SW4, the fifth power switch unit SW5 and the sixth power switch unit SW6 are connected in common and form the second end of the three-phase inverter 106 (as shown in Figure 2As shown in , the second end is coupled with the positive terminal OUT+ of the power battery 120, and a filter capacitor C is arranged between the three-phase inverter 106 and the power battery 120 to achieve a better matching effect). Here, the first power switch unit SW1 and the fourth power switch unit SW4 constitute the A-phase bridge arm, the second power switch unit SW2 and the fifth power switch unit SW5 constitute the B-phase bridge arm, and the third power switch unit SW3 and the sixth power switch unit SW3 constitute the C-phase bridge arm. Here, the midpoints of the three-phase bridge arms (A-phase bridge arm, B-phase bridge arm and C-phase bridge arm) of the three-phase inverter 106 are respectively connected to the three-phase coils of the three-phase coil 104.

[0059] Specifically, the first end of the first phase coil L1 (also referred to as the A phase coil) of the three-phase coil 104 is connected to the output end of the first power switch unit SW1 and the input end of the fourth power switch unit SW4, the first end of the second phase coil L2 (also referred to as the B phase coil) of the three-phase coil 104 is connected to the output end of the second power switch unit SW2 and the input end of the fifth power switch unit SW5, and the first end of the third phase coil L3 (also referred to as the C phase coil) of the three-phase coil 104 is connected to the output end of the third power switch unit SW3 and the input end of the sixth power switch unit SW6. In addition, it should be noted that the second end of the first phase coil L1 of the three-phase coil 104, the second end of the second phase coil L2, and the second end of the third phase coil L3 are not connected together to form a star connection, but are coupled to the positive terminal IN+ of the power supply module 110 via the switch module 102.

[0060] Specifically, the switch module 102 is constructed with multiple first ends (also referred to as output ends, three output ends in this case) and a second end (also referred to as an input end). The multiple first ends of the switch module 102 are respectively connected to the second ends of the coils L1, L2, and L3 of the three-phase coil 104, and the second end of the switch module 102 is coupled to the positive end IN+ of the power supply module 110 to receive the power supply voltage from the power supply module 110.

[0061] For example, as in Figure 2As shown in , the switch module 102 includes a first switch S1, a second switch S2 and a third switch S3. The first switch S1 is used to connect to the first phase coil L1, wherein the first end of the first switch S1 is connected to the second end of the first phase coil L1 and the second end of the first switch S1 is connected to the second end of the second phase coil L2. The second switch S2 is used to connect to the second phase coil L2, wherein the first end of the second switch S2 is connected to the second end of the second phase coil L2 and the second end of the second switch S2 is connected to the second end of the third phase coil L3. The third switch S3 is used to connect to the third phase coil L3 and to connect to the power supply module 110, wherein the first end of the third switch S3 is connected to the second end of one phase coil in the three-phase coil 104 and the second end of the third switch S3 is connected to the one second end of the switch module 110. As shown in Figure 2 As shown in , a first end of the third switch S3 is connected to a second end of the third phase coil L3 in the three-phase coil 104 , and a second end of the third switch S3 is connected to the one second end of the switch module 110 , ie, connected to the power supply module 110 .

[0062] Next, refer to Figure 2 A possible solution of the boost charging mode is described in detail. Here, the charging voltage of the power battery 120, that is, the target voltage, is, for example, 800V, and the power supply module 110 is, for example, configured as a charging pile and provides a power supply voltage of, for example, 400V.

[0063] 1. Three-phase parallel charging mode

[0064] First, all switches S1 , S2 , and S3 of the switch module 102 are closed.

[0065] Then, in the first stage, all first power switch units SW1, SW2, SW3 of the three-phase bridge arms of the three-phase inverter 106 are closed. At this time, the inductances of the stator windings L1, L2, L3 are connected in parallel to each other and are all charged.

[0066] Then, in the second stage, all the first power switch units SW1, SW2, SW3 of the three-phase bridge arm of the three-phase inverter 106 are disconnected and all the second power switch units SW4, SW5, SW6 of the three-phase bridge arm of the three-phase inverter 106 are closed. At this time, the voltage of the 400V charging pile 110 is superimposed on the voltage of the inductance of the motor stator windings L1, L2, L3, so as to realize charging the power battery 120 in a boosted manner.

[0067] 2. Three-phase series charging mode

[0068] First, the first switch S1 and the third switch S3 of the switch module 102 are closed, and the second power switch units SW5 and SW6 of the second phase bridge arm and the third phase bridge arm of the three-phase inverter 106 are closed.

[0069] Then, in the first stage, the first power switch unit SW1 of the first phase bridge arm of the three-phase inverter 106 is closed. At this time, the inductances of the stator windings L1, L2, and L3 are connected in series with each other and are all charged.

[0070] Subsequently, in the second stage, the first power switch unit SW1 of the first phase bridge arm of the three-phase inverter 106 is disconnected and the second power switch unit SW4 of the first phase bridge arm of the three-phase inverter 106 is closed. At this time, the voltage of the 400V charging pile 110 is superimposed on the voltage of the inductance of the motor stator windings L1, L2, and L3, thereby realizing charging the power battery 120 in a boosted manner.

[0071] 3. Two-phase parallel charging mode and another phase series charging mode

[0072] First, the first switch S1 , the second switch S2 , and the third switch S3 in the switch module 102 are closed.

[0073] Then, in the first stage, the first power switch unit SW1 of the first phase bridge arm of the three-phase inverter 106 is closed, and the second power switch units SW5 and SW6 of the second phase bridge arm and the third phase bridge arm of the three-phase inverter 106 are closed.

[0074] Subsequently, in the second stage, the first power switch unit SW1 of the first phase bridge arm of the three-phase inverter 106 is disconnected, and the second power switch unit SW4 of the first phase bridge arm of the three-phase inverter 106 is closed. At this time, the voltage of the 400V charging pile 110 is superimposed on the voltage of the inductance of the motor stator windings L1, L2, and L3, thereby realizing charging of the power battery 120 in a boosted manner.

[0075] 4. Single-phase charging mode

[0076] First, the third switch S3 in the switch module 102 is closed.

[0077] Then, in the first stage, the first power switch unit SW3 of the third phase bridge arm of the three-phase inverter 106 is closed. At this time, the inductance of the stator winding L3 is charged.

[0078] Subsequently, in the second stage, the first power switch unit SW3 of the third phase bridge arm of the three-phase inverter 106 is disconnected and the second power switch unit SW6 of the third phase bridge arm of the three-phase inverter 106 is closed. At this time, the voltage of the 400V charging pile 110 is superimposed on the voltage on the inductance of the motor stator winding L3, thereby realizing charging the power battery 120 in a boosted manner.

[0079] 5. Two-phase parallel charging mode

[0080] First, the second switch S2 and the third switch S3 in the switch module 102 are closed.

[0081] Then, in the first stage, the first power switch units SW2 and SW3 of the second phase bridge arm and the third phase bridge arm of the three-phase inverter 106 are closed. At this time, the inductances of the stator windings L2 and L3 are connected in parallel and charged.

[0082] Subsequently, in the second stage, the first power switch units SW2 and SW3 of the second phase bridge arm and the third phase bridge arm of the three-phase inverter 106 are disconnected and the second power switch units SW5 and SW6 of the second phase bridge arm and the third phase bridge arm of the three-phase inverter 106 are closed. At this time, the voltage of the 400V charging pile 110 is superimposed on the voltage on the inductance of the motor stator windings L2 and L3, thereby realizing charging the power battery 120 in a boosted manner.

[0083] Here, by controlling the switch matrix or switch module 102 and the three-phase inverter 104, one coil, two coils or three coils in the three-phase coils and one bridge arm, two bridge arms or three bridge arms in the three-phase bridge arms can be controlled to realize a variety of charging modes such as boosting the relatively low supply voltage (e.g. 400V) of the charging pile to the relatively high charging voltage (e.g. 800V) required by the power battery.

[0084] exist Figure 3(a) to Figure 3(c) 2 is a schematic structural diagram of an exemplary embodiment of a switch module 102 of a boost system 100 according to the present application.

[0085] For ease of understanding, in addition to the switch module 102, FIG3(a) also shows a three-phase coil 104 and a three-phase inverter 106. In FIG3(a), the third switch S3 is used to connect the third phase coil L3 of the three-phase coil 104 and to connect the power supply module 110.

[0086] The switch module 102 in the upper sub-figure of FIG. 3( a ) corresponds to Figure 2 , I will not go into details here.

[0087] The switch module 102 in the left sub-figure in the lower half of FIG. 3( a ) and Figure 2 The difference between the switch module 102 in FIG. 1 and FIG. 2 is that a first end of the third switch S3 is connected to a second end of the second phase coil L2 in the three-phase coil 104 .

[0088] In one embodiment, with reference to Figure 2 The three-phase parallel charging mode described above is implemented in substantially the same manner as the three-phase parallel charging mode, which will not be described in detail here.

[0089] In one embodiment, with reference to Figure 2 The two-phase parallel charging mode and the other-phase series charging mode are implemented in substantially the same manner as the two-phase parallel charging mode described above, and will not be described in detail herein.

[0090] In one embodiment, first, the third switch S3 in the switch module 102 is closed. Then, in the first stage, the first power switch unit SW2 of the second phase bridge arm of the three-phase inverter 106 is closed. At this time, the inductance of the stator winding L2 is charged. Subsequently, in the second stage, the first power switch unit SW2 of the second phase bridge arm of the three-phase inverter 106 is disconnected and the second power switch unit SW5 of the second phase bridge arm of the three-phase inverter 106 is closed. At this time, the voltage of the 400V charging pile 110 is superimposed on the voltage on the inductance of the motor stator winding L2, thereby realizing charging the power battery 120 in a boosted manner. Thus, a single-phase charging mode is realized.

[0091] In one embodiment, first, the second switch S2 and the third switch S3 in the switch module 102 are closed. Then, in the first stage, the first power switch units SW2 and SW3 of the second phase bridge arm and the third phase bridge arm of the three-phase inverter 106 are closed. At this time, the inductances of the stator windings L2 and L3 are connected in parallel with each other and charged. Subsequently, in the second stage, the first power switch units SW2 and SW3 of the second phase bridge arm and the third phase bridge arm of the three-phase inverter 106 are disconnected and the second power switch units SW5 and SW6 of the second phase bridge arm and the third phase bridge arm of the three-phase inverter 106 are closed. At this time, the voltage of the 400V charging pile 110 is superimposed on the voltage on the inductance of the motor stator windings L2 and L3, thereby realizing charging the power battery 120 in a boosted manner. Thus, a two-phase parallel charging mode is realized. A similar situation applies to the two-phase parallel charging mode of the motor stator windings L2 and L1, which will not be repeated here.

[0092] The switch module 102 in the right sub-figure in the lower half of FIG. 3( a ) and Figure 2 The difference between the switch module 102 in FIG. 1 and FIG. 2 is that a first end of the third switch S3 is connected to a second end of the first phase coil L1 in the three-phase coil 104 .

[0093] In one embodiment, with reference to Figure 2 The three-phase parallel charging mode described above is implemented in substantially the same manner as the three-phase parallel charging mode, which will not be described in detail here.

[0094] In one embodiment, first, the second switch S2 and the third switch S3 of the switch module 102 are closed and the second power switch units SW4 and SW5 of the first phase bridge arm and the second phase bridge arm of the three-phase inverter 106 are closed. Then, in the first stage, the first power switch unit SW3 of the third phase bridge arm of the three-phase inverter 106 is closed. At this time, the inductances of the stator windings L1, L2, and L3 are connected in series with each other and are fully charged. Subsequently, in the second stage, the first power switch unit SW3 of the third phase bridge arm of the three-phase inverter 106 is disconnected and the second power switch unit SW6 of the third phase bridge arm of the three-phase inverter 106 is closed. At this time, the voltage of the 400V charging pile 110 is superimposed on the voltage on the inductance of the motor stator windings L1, L2, and L3, thereby realizing charging the power battery 120 in a boosted manner. Thus, a three-phase series charging mode is realized.

[0095] In one embodiment, with reference to Figure 2 The two-phase parallel charging mode and the other-phase series charging mode are implemented in substantially the same manner as the two-phase parallel charging mode described above, and will not be described in detail herein.

[0096] In one embodiment, first, the third switch S3 in the switch module 102 is closed. Then, in the first stage, the first power switch unit SW1 of the first phase bridge arm of the three-phase inverter 106 is closed. At this time, the inductance of the stator winding L1 is charged. Subsequently, in the second stage, the first power switch unit SW1 of the first phase bridge arm of the three-phase inverter 106 is disconnected and the second power switch unit SW4 of the first phase bridge arm of the three-phase inverter 106 is closed. At this time, the voltage of the 400V charging pile 110 is superimposed on the voltage on the inductance of the motor stator winding L1, thereby realizing charging the power battery 120 in a boosted manner. Thus, a single-phase charging mode is realized.

[0097] In one embodiment, first, the first switch S1 and the third switch S3 in the switch module 102 are closed. Then, in the first stage, the first power switch units SW1 and SW2 of the first phase bridge arm and the second phase bridge arm of the three-phase inverter 106 are closed. At this time, the inductances of the stator windings L1 and L2 are connected in parallel with each other and charged. Subsequently, in the second stage, the first power switch units SW1 and SW2 of the first phase bridge arm and the second phase bridge arm of the three-phase inverter 106 are disconnected and the second power switch units SW4 and SW5 of the first phase bridge arm and the second phase bridge arm of the three-phase inverter 106 are closed. At this time, the voltage of the 400V charging pile 110 is superimposed on the voltage on the inductance of the motor stator windings L1 and L2, thereby realizing charging the power battery 120 in a boosted manner. Thus, a two-phase parallel charging mode is realized.

[0098] In Figures 3(b) and 3(c), only the switch module 102 is shown, wherein the switch module 102 includes a first switch S1, a second switch S2, a third switch S3 and a fourth switch S4, wherein the first switch, the second switch and the third switch are used to connect the first phase coil L1, the second phase coil L2 and the third phase coil L3 in the three-phase coil 104, and the fourth switch is used to connect the power supply module 110.

[0099] The switch module 102 in FIG. 3( b) is different from the switch module 102 in FIG. 3( a) in that the third switch S3 is arranged at the “rear” and is not directly coupled to the positive terminal IN+ of the power supply module 110, but is coupled to the positive terminal IN+ of the power supply module 110 via the fourth switch S4. When the third switch S3 is closed, the switch module 102 basically corresponds to the switch module 102 in FIG. 3( a). Next, possible charging modes are described mainly for the case where the third switch S3 is disconnected.

[0100] For the left sub-figure in Figure 3(b), for example, the following charging methods can be implemented: a single-phase charging mode is implemented via the inductance of the motor stator winding L2 (the second switch S2 and the fourth switch S4 in the switch module 102 are closed); a two-phase parallel charging mode is implemented via the inductance of the motor stator windings L1 and L2 (the first switch S1, the second switch S2 and the fourth switch S4 in the switch module 102 are closed).

[0101] For the middle sub-diagram in Figure 3(b), for example, the following charging methods can be implemented: a single-phase charging mode is implemented via the inductance of the motor stator winding L2 (the fourth switch S4 in the switch module 102 is closed); a two-phase parallel charging mode is implemented via the inductance of the motor stator windings L1 and L2 (the first switch S1 and the fourth switch S4 in the switch module 102 are closed).

[0102] For the right sub-figure in Figure 3(b), for example, the following charging methods can be implemented: a single-phase charging mode is implemented via the inductance of the motor stator winding L1 (the fourth switch S4 in the switch module 102 is closed); a two-phase parallel charging mode is implemented via the inductance of the motor stator windings L1 and L2 (the first switch S1 and the fourth switch S4 in the switch module 102 are closed).

[0103] In Figure 3(c), the first ends of the first switch S1, the second switch S2 and the third switch S3 are respectively connected to the second ends of the A-phase coil L1, the B-phase coil L2 and the C-phase coil L3 in the three-phase coil 104, and the second ends of the first switch S1, the second switch S2 and the third switch S3 are connected in common and coupled to the power supply module 110 via the fourth switch S4.

[0104] By using the switch module 102 shown in FIG. 3( c ), for example, the following charging methods can be implemented:

[0105] -Three-phase parallel charging mode: close all switches S1, S2, S3, S4 of the switch module 102; in the first stage, close all first power switch units SW1, SW2, SW3 of the three-phase bridge arm of the three-phase inverter 106; in the second stage, disconnect all first power switch units SW1, SW2, SW3 of the three-phase bridge arm of the three-phase inverter 106 and close all second power switch units SW4, SW5, SW6 of the three-phase bridge arm of the three-phase inverter 106.

[0106] - Two-phase parallel charging mode and another phase series charging mode: In addition to closing the fourth switch S4, this is the same as the reference mode. Figure 2 The described two-phase parallel charging mode is implemented in substantially the same manner as the other phase series charging mode, and will not be described in detail here.

[0107] - Single-phase charging mode: close the first switch S1 (connected to the motor stator winding L1) and the fourth switch S4 in the switch module 102; in the first stage, close the first power switch unit SW1 of the first phase bridge arm of the three-phase inverter 106; in the second stage, open the first power switch unit SW1 of the first phase bridge arm of the three-phase inverter 106 and close the second power switch unit SW4 of the first phase bridge arm of the three-phase inverter 106. Similar situations apply to the single-phase charging mode connected to the motor stator winding L2 or L3, which will not be described in detail here.

[0108] - Two-phase parallel charging mode: close the first switch S1, the second switch S2 and the fourth switch S4 in the switch module 102 (connect to the motor stator windings L1 and L2); in the first stage, close the first power switch units SW1 and SW2 of the first phase bridge arm and the second phase bridge arm of the three-phase inverter 106; in the second stage, disconnect the first power switch units SW1 and SW2 of the first phase bridge arm and the second phase bridge arm of the three-phase inverter 106 and close the second power switch units SW4 and SW5 of the first phase bridge arm and the second phase bridge arm of the three-phase inverter 106. Similar situations are applicable to the two-phase parallel charging mode connected to the motor stator windings L1 and L3 or connected to the motor stator windings L2 and L3, which will not be described in detail here.

[0109] In one embodiment, the switch module and the three-phase inverter are alternately controlled; in other words, one or two coils of the three-phase coil 104 are alternately connected. Preferably, in one example, the alternation is performed according to a predetermined time pattern. Preferably, in one example, the temperature or temperature distribution of the boost system 10, especially the coil, is measured, and the switch module 102 and the three-phase inverter 106 are controlled based on the temperature or temperature distribution. For example, in the case of a single-phase charging mode, the charging is switched from connecting the A-phase coil to charging by connecting the B-phase coil, and then the charging is switched from connecting the B-phase coil to charging by connecting the C-phase coil, and so on. For example, in the case of a two-phase parallel charging mode, the charging is switched from connecting the AB-phase coil to charging by connecting the BC-phase coil, and then the charging is switched from connecting the BC-phase coil to charging by connecting the AC-phase coil, and so on.

[0110] exist Figure 4 2 is a schematic flow chart of an exemplary embodiment of a voltage boosting method 200 according to the present application.

[0111] During normal driving, the star connection is maintained by the switch module 102, for example, S1, S2 (see FIG. 3 (a)) or S1, S2, S3 (see FIG. 3 (b) and FIG. 3 (c)). During the charging process, the boost method 200 according to the present application is considered, wherein the description of switches S1, S2, S3 or power switch units SW1 to SW6 in the above and below is based on the following premise: all switches and all power switch units are in the disconnected state in the initial stage.

[0112] In step S1 , for example, the control module 108 detects or obtains the power supply voltage of the power supply module 110 and the charging voltage of the power battery 120 .

[0113] Here, the control module 108 compares the supply voltage with the charging voltage. It is conceivable that when the supply voltage is less than the charging voltage, the boost method 200 according to the present application is triggered or enabled to boost the supply voltage (e.g., 400V) to the charging voltage (e.g., 800V).

[0114] In step S3 , for example, the control module 108 controls the boost system 100 , especially controls the switch module 102 and the three-phase inverter 106 , so as to form a boost circuit by reusing the inductance of the motor stator winding, thereby achieving boost charging of the power battery 120 .

[0115] Preferably, here, the control module 108 is configured to determine the ratio of the supply voltage to the charging voltage, and select the best boost charging mode according to the ratio. Exemplarily, when the supply voltage is relatively small (e.g., 220V, 380V, etc.), three-phase series charging is selected, for example, to obtain a better boost effect. Exemplarily, when the supply voltage is relatively large (e.g., 500V or higher, but still less than 800V charging voltage), three-phase parallel charging is selected, for example, so as to meet the boost requirement while also being able to obtain a large charging current and / or charging power.

[0116] The specific implementation scheme of boost charging is as described above in conjunction with the boost system 100 and the switch module 102, and will not be elaborated here.

[0117] exist Figure 5 1 is a schematic diagram of an exemplary embodiment of a vehicle 300 according to the present application. The vehicle 300 is equipped with a boost system 100 according to the present application. The boost system 100 includes a power battery 120 (in Figure 5 In addition, the boost system 100 includes a power supply module 110 or is connected to the power supply module 110 (in Figure 5 Only this case is shown in FIG. 1 ), a possible configuration of the power supply module is shown here as a charging station.

[0118] exist Figure 6 A schematic block diagram of a computer program product 400 according to the present application is shown in FIG.

[0119] The computer program product 400 includes computer program instructions. When the computer program instructions are executed by a processor or a controller, the computer program instructions can at least partially execute the voltage boosting method 300 for a power battery according to the present application.

[0120] The computer program product 400 is stored on a computer-readable program medium, or in other words, computer program instructions of the computer-readable product 400 are stored on the computer-readable program medium. When the computer program instructions are executed by a processor or a controller, the computer program instructions can at least partially execute the boost method 300 for a power battery according to the present application.

[0121] In summary, when using, for example, a charging pile to charge the power battery of an electric vehicle, especially when the voltage provided by the charging pile cannot meet the charging requirements of the power battery, that is, when the voltage provided by the charging pile is less than the voltage required by the power battery, the motor inductance is reused to form a boost circuit to achieve compatibility with the charging pile. In the present application, the stator windings of the motor are not directly connected in common to form a star connection, but each phase winding or each phase coil is separately connected to the switch matrix and led out through the switch matrix. By manipulating (closing or opening) each switch in the switch matrix, different windings or coils can be connected to the boost circuit, and combined with the manipulation of the power switch unit of the corresponding bridge arm, a variety of boost charging methods can be achieved.

[0122] Although specific embodiments of the present application are described in detail herein, they are provided for the purpose of explanation only and should not be considered to limit the scope of the present application. Various alternatives and modifications may be proposed without departing from the core and scope of the present application.

Claims

1. A boost system for a power battery, the boost system comprising at least a switch module and a control module, the switch module, the coil of a motor and an inverter circuit of a motor driver forming a boost circuit, the switch module being connected to the power supply module on the input side and to the coil of the motor on the output side, the control module being able to control the coil of the motor at least by controlling the switch module, so that the power battery can be boosted and charged.

2. The boost system according to claim 1, wherein: The switch module includes an input terminal on the input side and a plurality of output terminals on the output side, the input terminal is connected to the power supply module, and corresponding output terminals among the plurality of output terminals are respectively connected to corresponding coils among the coils of the motor.

3. The boost system according to claim 2, wherein: The switch module includes a plurality of switches. Each of the multiple output ends of the switch module is respectively connected to at least one switch of the multiple switches, and the control module can control at least one coil of the coils of the motor by at least controlling the at least one switch of the multiple switches of the switch module, so that the power battery can be boosted and charged in a variable manner. The input end of the switch module is connected to at least one switch among the multiple switches, and the control module can stop boost charging of the power battery by at least disconnecting the at least one switch among the multiple switches of the switch module.

4. A boost system according to any one of the preceding claims, wherein: The switch module includes three output terminals, the coil of the motor is constructed as a three-phase coil, the inverter circuit of the motor driver is constructed as a three-phase inverter, each phase coil of the three-phase coil is connected to one of the three output terminals of the switch module at one end and is connected to the midpoint of the three-phase bridge arm of the three-phase inverter at the other end, and the control module can control the coil of the motor by controlling the switch module and the three-phase inverter, so that the power battery can be boosted and charged.

5. The boost system according to claim 4, in, The switch module includes a first switch, a second switch and a third switch, wherein the first switch, the second switch and the third switch are used to connect to the first phase coil, the second phase coil and the third phase coil of the three-phase coil, and the third switch is used to connect to the power supply module; or Among them, the switch module includes a first switch, a second switch, a third switch and a fourth switch, the first switch, the second switch and the third switch are used to connect the first phase coil, the second phase coil and the third phase coil in the three-phase coil, and the fourth switch is used to connect the power supply module.

6. The boosting system according to any one of claims 4 to 5, wherein: The control module can implement at least one of the following boost charging modes: three-phase parallel charging, three-phase series charging, two-phase parallel charging and another phase series charging, single-phase charging, and two-phase parallel charging.

7. The boosting system according to any one of claims 4 to 6, wherein: The control module can be configured to: Closing all switches of the switch module, In the first stage, all first power switch units of the three-phase bridge arms of the three-phase inverter are closed. In the second phase, all first power switching units of the three-phase bridge legs of the three-phase inverter are opened, and all second power switching units of the three-phase bridge legs of the three-phase inverter are closed.

8. The boosting system according to any one of claims 4 to 7, wherein: The control module can be configured to: At least two of the first switch, the second switch and the third switch in the switch module are closed and the second power switch units of two phase bridge arms in the three-phase bridge arms of the three-phase inverter are closed, In the first stage, the first power switch unit of another phase bridge arm in the three-phase bridge arm of the three-phase inverter is closed. In the second phase, the first power switch unit of another phase leg of the three-phase bridge leg of the three-phase inverter is opened, and the second power switch unit of another phase leg of the three-phase bridge leg of the three-phase inverter is closed.

9. The boosting system according to any one of claims 4 to 8, wherein: The control module can be configured to: At least closing the first switch, the second switch and the third switch in the switch module, In the first stage, the first power switch unit of one phase bridge arm of the three-phase inverter is closed and the second power switch units of the other two phase bridge arms of the three-phase inverter are closed. In the second stage, the first power switch unit of one of the three-phase bridge arms of the three-phase inverter is disconnected and the second power switch units of the other two phase bridge arms of the three-phase inverter are disconnected, and the second power switch unit of one of the three-phase bridge arms of the three-phase inverter is closed.

10. The boosting system according to any one of claims 4 to 9, wherein: The control module can be configured to: At least one of the first switch, the second switch and the third switch in the switch module is closed, In the first stage, the first power switch unit of a corresponding one-phase bridge arm in the three-phase bridge arm of the three-phase inverter is closed. In the second stage, the first power switch unit of a corresponding one of the three-phase bridge arms of the three-phase inverter is opened, and the second power switch unit of a corresponding one of the three-phase bridge arms of the three-phase inverter is closed.

11. The boosting system according to any one of claims 4 to 10, wherein: The control module can be configured to: At least two switches among the first switch, the second switch and the third switch in the switch module are closed, In the first stage, the first power switch units of the corresponding two-phase bridge arms in the three-phase bridge arms of the three-phase inverter are closed. In the second stage, the first power switch units of the corresponding two-phase bridge arms among the three-phase bridge arms of the three-phase inverter are opened, and the second power switch units of the corresponding two-phase bridge arms among the three-phase bridge arms of the three-phase inverter are closed.

12. A boost system according to any one of the preceding claims, wherein: The control module can be configured to select the control of the switch module and the inverter circuit of the motor driver based on the supply voltage of the power supply module.

13. The boost system according to claim 12, wherein: Determine the ratio of the supply voltage of the power supply module to the charging voltage required by the power battery, and when the ratio is greater than a first threshold, select parallel charging, such as three-phase parallel charging; when the ratio is less than a second threshold, select series charging, such as three-phase series charging.

14. A boost system according to any one of the preceding claims, wherein: The control module can be configured to alternately control the switch module and the inverter circuit of the motor driver.

15. A voltage boosting method for a power battery, the voltage boosting method being applied to the voltage boosting system according to any one of claims 1 to 14.

16. A vehicle equipped with a boost system according to any one of claims 1 to 14. 17 . A computer program product, such as a computer-readable program medium, comprising or storing computer program instructions, and when the computer program instructions are executed by a processor or a controller, the computer program instructions can at least partially execute the voltage boosting method according to claim 15 .

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