Voltage conversion circuit and electric automobile

Abstract

The utility model provides a voltage conversion circuit and an electric vehicle. The voltage conversion circuit comprises a voltage transformation module and a switch module. A first end of the switch module is connected with a power supply battery of the electric automobile; the second end of the switch module is connected with the voltage transformation module; the voltage transformation module is connected with an electronic driving system of the electric automobile; the third end of the switch module is connected with an electronic driving system of the electric automobile; one of the second end and the third end of the switch module is selected to be conducted with the first end; when the second end and the first end of the switch module are conducted, the power supply battery is communicated with the electronic driving system through the switch module and the voltage transformation module in sequence; and when the third end and the first end of the switch module are conducted, the power supply battery is communicated with the electronic driving system through the switch module. By adopting the scheme, the power supply battery is compatible with electronic driving systems with different voltage requirements, and the compatibility is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a voltage conversion circuit and an electric vehicle. BACKGROUND

[0002] An electric vehicle is an environmentally friendly vehicle driven by electric energy. The electric vehicle includes a power supply battery and an electronic driving system. For example, the power supply battery is a high-voltage battery with a voltage exceeding 200V, and the high-voltage battery is generally a 400V battery or an 800V battery. After the driver starts the vehicle, the high-voltage battery is powered on and outputs direct current to the inverter in the electronic driving system, and the inverter converts the direct current into alternating current for the electric motor in the electronic driving system.

[0003] Generally, the power supply battery of the electric vehicle needs to match the working voltage required by the electronic driving system. For example, a 400V high-voltage battery is used to supply power to a 400V electronic driving system, or an 800V high-voltage battery is used to supply power to an 800V electronic driving system, and the compatibility is poor. CONTENT OF THE INVENTION

[0004] The present application provides a voltage conversion circuit and an electric vehicle to solve the above technical problems in the prior art.

[0005] According to a first aspect of the present application, a voltage conversion circuit is provided, comprising a voltage conversion module and a switching module;

[0006] The first end of the switching module is connected to the power supply battery of the electric vehicle;

[0007] The second end of the switching module is connected to the voltage conversion module, and the voltage conversion module is connected to the electronic driving system of the electric vehicle;

[0008] The third end of the switching module is connected to the electronic driving system of the electric vehicle;

[0009] The switching module is in conduction with the first end at the second end and the third end; when the second end of the switching module is in conduction with the first end, the power supply battery is in communication with the electronic driving system through the switching module and the voltage conversion module in sequence; when the third end of the switching module is in conduction with the first end, the power supply battery is in communication with the electronic driving system through the switching module.

[0010] In some embodiments, when the power supply battery is a high-voltage battery providing a first voltage, the switching module switches to the second end in conduction with the first end, and the first voltage output by the high-voltage battery is output to the electronic driving system after being converted by the voltage conversion module;

[0011] When the power supply battery is a high-voltage battery providing a second voltage, the switch module switches to the third end and the first end being conductive, and the second voltage output by the high-voltage battery is output to the electronic driving system; the first voltage is less than the second voltage.

[0012] In some embodiments, the first voltage is 400V, and the second voltage is 800V.

[0013] In some embodiments, the switch module comprises a first switch assembly, a second switch assembly, a third switch assembly, and a fourth switch assembly.

[0014] The first end of the switch module comprises the first end of each of the first switch assembly, the second switch assembly, the third switch assembly, and the fourth switch assembly, wherein the first end of the first switch assembly and the first end of the third switch assembly are connected to the first electrode of the power supply battery, and the first end of the second switch assembly and the first end of the fourth switch assembly are connected to the second electrode of the power supply battery.

[0015] The second end of the switch module comprises the second end of the first switch assembly and the second end of the second switch assembly, wherein the second end of the first switch assembly is connected to the first end of the electronic driving system through the voltage transformation module, and the second end of the second switch assembly is connected to the second end of the electronic driving system through the voltage transformation module.

[0016] The third end of the switch module comprises the second end of the third switch assembly and the second end of the fourth switch assembly, wherein the second end of the third switch assembly is connected to the first end of the electronic driving system, and the second end of the fourth switch assembly is connected to the second end of the electronic driving system.

[0017] When the first switch assembly and the second switch assembly are closed and the third switch assembly and the fourth switch assembly are open, the power supply battery is sequentially connected to the electronic driving system through the switch module and the voltage transformation module; when the first switch assembly and the second switch assembly are open and the third switch assembly and the fourth switch assembly are closed, the power supply battery is connected to the electronic driving system through the switch module.

[0018] In some embodiments, the first switch assembly comprises two first switches; the two first switches are connected in series, one end of the series is used as the first end of the first switch assembly for connecting the first electrode of the power supply battery, and the other end of the series is used as the second end of the first switch assembly for connecting the voltage transformation module; and / or

[0019] The second switch assembly includes two second switches; the two second switches are connected in series, one end of the series is the first end of the second switch assembly, used for connecting the second electrode of the power supply battery, the other end of the series is the second end of the second switch assembly, used for connecting the voltage conversion module.

[0020] In some embodiments, the voltage conversion circuit further includes a first charging connection line and a second charging connection line, one end of the first charging connection line is connected to the connection node between the two first switches, the other end of the first charging connection line is used for connecting the first end of the charging device;

[0021] One end of the second charging connection line is connected to the connection node between the two second switches, the other end of the second charging connection line is used for connecting the second end of the charging device;

[0022] The power supply battery is a high-voltage battery, when the first switch connected to the first electrode and the second switch connected to the second electrode are closed, and the first switch connected to the voltage conversion module, the second switch connected to the voltage conversion module, the third switch assembly and the fourth switch assembly are opened, the charging device outputting a first voltage is used to charge the high-voltage battery, the first voltage is greater than or equal to the charging requirement voltage of the high-voltage battery;

[0023] When the first switch connected to the first electrode and the second switch connected to the second electrode are opened, and the first switch connected to the voltage conversion module, the second switch connected to the voltage conversion module, the third switch assembly and the fourth switch assembly are closed, the charging device outputting a second voltage is used to charge the high-voltage battery after being boosted by the voltage conversion module, the second voltage is less than the charging requirement voltage of the high-voltage battery.

[0024] In some embodiments, the voltage conversion module includes a capacitor, an inductor and a switch circuit;

[0025] One end of the capacitor, one end of the inductor and the first end of the switch circuit are connected to the first end of the electronic driving system and the first second end of the switch module, the other end of the capacitor and the second end of the switch circuit are connected to the second end of the electronic driving system and the second second end of the switch module;

[0026] The other end of the inductor is connected to the third end of the switch circuit.

[0027] In some embodiments, the inductor includes a first inductor and a second inductor, and the switch circuit includes a fifth switch, a sixth switch, a seventh switch and an eighth switch;

[0028] The fifth switch and the sixth switch are connected in series in a first branch, the seventh switch and the eighth switch are connected in series in a second branch, the first branch and the second branch are connected in parallel, and one end of the parallel connection is a first end of the switch circuit, and the other end of the parallel connection is a second end of the switch circuit.

[0029] A connection node between the fifth switch and the sixth switch is a first third end of the switch circuit, used for connecting one end of the first inductor, and a connection node between the seventh switch and the eighth switch is a second third end of the switch circuit, used for connecting one end of the second inductor; the other end of the first inductor and the other end of the second inductor are both connected to the first end of the electronic driving system and the first second end of the switch module.

[0030] In some embodiments, the voltage conversion circuit further comprises a controller connected to the switch module.

[0031] According to a second aspect of the present application, an electric vehicle is provided, comprising a power supply battery and the voltage conversion circuit described above, and the power supply battery is connected to the voltage conversion circuit.

[0032] In summary, the voltage conversion circuit and the electric vehicle provided by the present application have at least the following beneficial effects:

[0033] The switch module and the transformer module are connected between the power supply battery and the electronic driving system, and the switch module is conducted with the first end of the switch module in the second end and the third end, so that the power supply battery can be connected to the electronic driving system through the transformer module to provide the required voltage to the electronic driving system through the voltage conversion of the transformer module, or the power supply battery can be directly connected to the electronic driving system without passing through the transformer module to directly supply the voltage to the electronic driving system, so that the power supply battery can supply power to the electronic driving system with different voltage requirements, and the compatibility is strong. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the drawings required in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and other drawings or schemes can be obtained by those skilled in the art without creative labor.

[0035] Figure 1 The circuit topology diagram of the voltage conversion circuit in one embodiment of the present application;

[0036] Figure 2 The structural diagram of the high-voltage battery connecting the electronic driving system through the voltage conversion circuit in one embodiment of the present application;

[0037] Figure 3 A circuit topology of a voltage conversion circuit in another embodiment of the present application;

[0038] Figure 4 A circuit topology of a voltage conversion circuit in another embodiment of the present application;

[0039] Figure 5 An explanatory diagram of switching states of switches in the voltage conversion circuit in different situations. DETAILED DESCRIPTION

[0040] In the description of the present application, it needs to be understood that, if the description of orientation or positional relationship such as terms “central”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” appears, without special indication, it is understood that the orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In addition, if the features limited by “first”, “second” appear, it is only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. The features limited by “first”, “second” can explicitly or implicitly include at least one of the features limited.

[0042] In the present application, unless otherwise explicitly specified and limited, if the terms “mounting”, “connecting”, “connecting”, “fixing” and the like appear, they should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the description of the present specification, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like appear, it means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0044] In one embodiment of the present application, referring to Figure 1 , a voltage conversion circuit is provided, which includes a switching module 110 and a voltage transformation module 130. The first end of the switching module 110 is connected to the high-voltage battery 200 of the electric vehicle. Among them, the high-voltage battery 200 is the power source of the electric vehicle, generally a high-voltage battery exceeding 200V. It can be understood that the present application is described by taking the high-voltage battery 200 as an example, but the present application is not limited to this, and the power battery of the electric vehicle can also be a battery with other voltage range according to the needs, and the battery voltage conversion circuit of other electrical equipment is also within the protection scope of the present application. Specifically, the first first end of the switching module 110 is connected to the first electrode of the high-voltage battery 200, and the second first end of the switching module 110 is connected to the second electrode of the high-voltage battery 200. Among them, the first electrode can be a positive electrode, and the second electrode can be a negative electrode, as shown in Figure 1 It can be understood that Figure 1 only one example, in other embodiments, the first electrode can also be a negative electrode, and the second electrode can be a positive electrode.

[0045] The second end of the switching module 110 is connected to the voltage transformation module 130, and the voltage transformation module 130 is connected to the electronic drive system of the electric vehicle. Specifically, the electronic drive system includes an inverter 300 and a motor, the voltage transformation module 130 is connected to the inverter 300, and the three bridge arms of the inverter 300 are connected to the three-phase line of the motor, for example Figure 1 As shown, the first bridge arm is connected to the first phase line of the motor through the line A, the second bridge arm is connected to the second phase line of the motor through the line B, and the third bridge arm is connected to the third phase line of the motor through the line C; the inverter 300 converts direct current into alternating current and outputs to the motor. Specifically, the first second end of the switching module 110 is connected to the first end of the electronic drive system through the voltage transformation module 130, specifically connected to the first end of the inverter 300; the second second end of the switching module 110 is connected to the second end of the electronic drive system through the voltage transformation module 130, specifically connected to the second end of the inverter 300.

[0046] The third end of the switch module 110 is connected to the electronic driving system of the electric vehicle. Specifically, the first third end of the switch module 110 is connected to the first end of the electronic driving system 300, specifically the first end of the inverter 300; the second third end of the switch module 110 is connected to the second end of the electronic driving system, specifically the second end of the inverter 300.

[0047] Since different high-voltage batteries 200 provide different voltages, there are two cases for the high-voltage battery 200 to meet the driving requirements of the electronic driving system and not to meet the driving requirements. For example, the voltage of the high-voltage battery 200 is equal to the working voltage of the electronic driving system, which meets the working voltage of the electronic driving system, and the voltage of the high-voltage battery 200 is less than the working voltage of the electronic driving system, which does not meet the working voltage of the electronic driving system; for example, the 400V high-voltage battery supplies power to the 400V electronic driving system, which meets the working voltage of the electronic driving system, and if the 400V high-voltage battery supplies power to the 800V electronic driving system, it does not meet the working voltage of the electronic driving system.

[0048] In the present application, the connection lines between the first end, the second end of the switch module 110, the voltage conversion module 130 and the electronic driving system are the first group of connection lines, and the connection lines between the first end, the third end of the switch module 110 and the electronic driving system are the second group of connection lines. Specifically, the switch module 110 is in conduction with the first end of the switch module 110 in the second end and the third end, that is, one group of connection lines is in conduction in the first group of connection lines and the second group of connection lines, so that the high-voltage battery 200 is electrically connected to the electronic driving system through the selected connection line, so that the high-voltage battery 200 can supply power to the electronic driving system through one group of connection lines. Specifically, when the second end of the switch module 110 is in conduction with the first end of the switch module 110, the high-voltage battery 200 is in communication with the electronic driving system through the switch module 110 and the voltage conversion module 130 in turn, so that the high-voltage battery 200 supplies power to the electronic driving system through the first group of connection lines, and the voltage conversion module 130 can be used for the case that the high-voltage battery 200 does not meet the working voltage of the electronic driving system, for example, the 400V high-voltage battery supplies power to the 800V electronic driving system. When the third end of the switch module 110 is in conduction with the first end of the switch module 110, the high-voltage battery 200 is in communication with the electronic driving system 300 through the switch module 110, so that the high-voltage battery 200 supplies power to the electronic driving system through the second group of connection lines, without the voltage conversion of the voltage conversion module 130, which can be used for the case that the high-voltage battery 200 meets the working voltage of the electronic driving system, for example, the 400V high-voltage battery supplies power to the 400V electronic driving system, or the 800V high-voltage battery supplies power to the 800V electronic driving system. In this way, the switch module 110 and the voltage conversion module 130 are connected between the high-voltage battery 200 and the electronic driving system, and the connection line is switched by the switch module 110, so that the high-voltage battery 200 is compatible with electronic driving systems with different voltage requirements.

[0049] The above-mentioned voltage conversion circuit takes the high-voltage battery 200 as an example of a power supply battery, connects the switch module 110 and the voltage conversion module 130 between the power supply battery and the electronic driving system, and makes the power supply battery connect to the electronic driving system through the voltage conversion module 130 and supply power to the electronic driving system through the voltage conversion of the voltage conversion module 130, or the power supply battery can directly connect to the electronic driving system without the voltage conversion module 130 and supply power directly to the electronic driving system, so that the power supply battery can supply power to electronic driving systems with different voltage requirements, and has strong compatibility.

[0050] Specifically, when the high-voltage battery 200 is a high-voltage battery providing a first voltage, the switch module 110 switches to the second terminal being conductive with the first terminal, and the first voltage output by the high-voltage battery 200 is output to the electronic driving system after being converted by the voltage conversion module 130. When the high-voltage battery 200 is a high-voltage battery providing a second voltage, the switch module 110 switches to the third terminal being conductive with the first terminal, and the second voltage output by the high-voltage battery 200 is output to the electronic driving system; the first voltage is less than the second voltage.

[0051] Specifically, the first voltage can be 400V, and the second voltage can be 800V. Taking an 800V electronic driving system as an example, when a 400V high-voltage battery is used, the switch module 110 switches to the second terminal being conductive with the first terminal, and the 400V voltage output by the high-voltage battery 200 is output to the electronic driving system after being converted by the voltage conversion module 130. When an 800V high-voltage battery is used, the switch module 110 switches to the third terminal being conductive with the first terminal, and the 800V voltage output by the high-voltage battery 200 is output to the electronic driving system. For example Figure 2 As shown, the 400V high-voltage battery is connected to the electronic driving system and the high-voltage components of the high-voltage system of the electric vehicle through the voltage conversion circuit. The 400V high-voltage battery can be used for the 400V electronic driving system and the 400V high-voltage components, and can also be used for the 800V electronic driving system and the 800V high-voltage components, being compatible with both 400V and 800V electronic driving systems, and having a lower cost. In addition, the direct current output by the 400V battery can also be used for the 400V high-voltage components and the 400V DCDC converter in the electric vehicle. When charging is needed, the 400V battery can be directly charged by the charging pile, or can be slowly charged by the external alternating current connected to the on-board charger (OBC), which converts the alternating current into direct current to charge the 400V battery.

[0052] In some embodiments, the voltage conversion circuit further comprises a controller connected to the switch module 110. The controller is configured to control the switch module 110 to be conductive between the first terminal and the second terminal, or to be conductive between the first terminal and the third terminal. For example, the controller sends different level signals to the switch module 110 to control the state switching of the switch module 110.

[0053] In some embodiments, the controller comprises any one of a battery management unit (BMS), a battery distribution unit (PDU), and a vehicle controller (VCU), so that the switch module 110 is controlled by the controller in the electric vehicle.

[0054] In some embodiments, with reference to Figure 3The switch module 110 includes a first switch assembly 111, a second switch assembly 112, a third switch assembly 113, and a fourth switch assembly 114. Each switch assembly can be connected to a controller for controlling the switch state of each switch assembly. For example, the controller can output a first voltage level to the switch assembly to open the switch assembly, and output a second voltage level to the switch assembly to close the switch assembly.

[0055] The first end of the switch module 110 includes the first end of each of the first switch assembly 111, the second switch assembly 112, the third switch assembly 113, and the fourth switch assembly 114, wherein the first end of the first switch assembly 111 and the first end of the third switch assembly 113 are connected to the first electrode of the high-voltage battery 200, and the first end of the second switch assembly 112 and the first end of the fourth switch assembly 114 are connected to the second electrode of the high-voltage battery 200.

[0056] The second end of the switch module 110 includes the second end of the first switch assembly 111 and the second end of the second switch assembly 112, wherein the second end of the first switch assembly 111 is connected to the first end of the electronic drive system, such as the first end of the inverter 300, through the voltage conversion module 130, and the second end of the second switch assembly 112 is connected to the second end of the electronic drive system, such as the second end of the inverter 300, through the voltage conversion module 130. The third end of the switch module 110 includes the second end of the third switch assembly 113 and the second end of the fourth switch assembly 114, wherein the second end of the third switch assembly 113 is connected to the first end of the electronic drive system, and the second end of the fourth switch assembly 114 is connected to the second end of the electronic drive system.

[0057] When the first switch assembly 111 and the second switch assembly 112 are closed, and the third switch assembly 113 and the fourth switch assembly 114 are opened, the high-voltage battery 200 is connected to the electronic drive system through the switch module 110 and the voltage conversion module 130 in turn; when the first switch assembly 111 and the second switch assembly 112 are opened, and the third switch assembly 113 and the fourth switch assembly 114 are closed, the high-voltage battery 200 is connected to the electronic drive system through the switch module 110.

[0058] Specifically, when the voltage of the high-voltage battery 200 does not meet the working voltage of the electronic driving system, the controller can control the first switch assembly 111 and the second switch assembly 112 to be closed, and the third switch assembly 113 and the fourth switch assembly 114 to be opened, so that the first group of connection lines where the voltage conversion module 130 is located is turned on, and the second group of connection lines is turned off, thereby making the high-voltage battery 200 supply power to the electronic driving system through the voltage conversion module 130; the voltage conversion module 130 converts and outputs the voltage output by the high-voltage battery 200 to the electronic driving system, so as to reach the working voltage of the electronic driving system, for example, the voltage output by the 400V high-voltage battery is boosted to 800V required by the electronic driving system through the voltage conversion module 130. When the voltage of the high-voltage battery 200 meets the working voltage of the electronic driving system, the controller can control the first switch assembly 111 and the second switch assembly 112 to be opened, and the third switch assembly 113 and the fourth switch assembly 114 to be closed, so that the second group of connection lines is turned on, and the first group of connection lines where the voltage conversion module 130 is located is turned off, thereby making the high-voltage battery 200 directly supply power to the electronic driving system, for example, the 400V high-voltage battery supplies power to the 400V electronic driving system.

[0059] In some embodiments, the first switch assembly 111 includes two first switches; the two first switches are connected in series, and one end after the series connection is used as a first end of the first switch assembly 111 for connecting the first electrode of the high-voltage battery 200, and the other end after the series connection is used as a second end of the first switch assembly 111 for connecting the voltage conversion module 130. Figure 3 For example, the two first switches are respectively a first switch S1 and a first switch S5. The first switch S1 and the first switch S5 are connected in series, and the first switch S1 is connected to the first electrode of the high-voltage battery 200, and the first switch S5 is connected to the voltage conversion module 130. Two switches are used for switching control, and the controllability is strong.

[0060] In some embodiments, the second switch assembly 112 includes two second switches; the two second switches are connected in series, and one end after the series connection is used as a first end of the second switch assembly 112 for connecting the second electrode of the high-voltage battery 200, and the other end after the series connection is used as a second end of the second switch assembly 112 for connecting the voltage conversion module 130.

[0061] For example, the two second switches are respectively a second switch S2 and a second switch S6; the second switch S2 and the second switch S6 are connected in series, the second switch S2 is connected to the second electrode of the high-voltage battery, and the second switch S6 is connected to the voltage conversion module 130. Two switches are used for switching control, and the controllability is strong.

[0062] In some embodiments, with reference to Figure 2The third switch assembly 113 includes a third switch S3, and the fourth switch assembly 114 includes a fourth switch S4. It is understood that in other embodiments, the third switch assembly 113 may also include multiple third switches, and the fourth switch assembly 114 may also include multiple fourth switches.

[0063] In some embodiments, the first switch S1, the first switch S5, the second switch S2, the second switch S6, the third switch S3, and the fourth switch S4 all include any one of a relay, an IGBT (Insulated Gate Bipolar Transistor), a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), and a transistor, which is convenient to operate. It is understood that the first switch S1, the first switch S5, the second switch S2, the second switch S6, the third switch S3, and the fourth switch S4 can also be other types of switching devices, and this application does not impose any limitations on this.

[0064] In some embodiments, the voltage conversion circuit further includes a first charging connection line and a second charging connection line. One end of the first charging connection line is connected to the connection node between two first switches, and the other end of the first charging connection line is used to connect to a first terminal of the charging device. One end of the second charging connection line is connected to the connection node between two second switches, and the other end of the second charging connection line is used to connect to a second terminal of the charging device.

[0065] For example, such as Figure 4 The connection point E between the first switches S1 and S5 is used to connect to the first end of the charging device, specifically through contact E1. The connection point F between the second switches S2 and S6 is used to connect to the second end of the charging device, specifically through contact F1. The charging device is a device that provides DC charging, such as a DC charging station. For example, if the first electrode is positive and the second electrode is negative, then the first end of the charging device is the positive terminal and the second end is the negative terminal; conversely, if the first electrode is negative and the second electrode is positive, then the first end of the charging device is the negative terminal and the second end is the positive terminal.

[0066] By connecting the connection point E of the first switch S1 and the first switch S5 to the first end of the charging device, and connecting the connection point G of the second switch S2 and the second switch S6 to the second end of the charging device, the high-voltage battery 200 can be made compatible with different electronic drive systems and different charging devices by switching the switch states in the working mode of power supply and the mode of charging the high-voltage battery 200.

[0067] Specifically, in the power supply mode of the high-voltage battery 200, when the voltage of the high-voltage battery 200 does not meet the operating voltage of the electronic drive system, the switching states of each switch are as follows: Figure 5 As shown in condition 2,Figure 5 In the condition 4, close means closed, open means opened. Specifically, the controller controls the first switch S1 to be closed, the first switch S5 to be closed, the second switch S2 to be closed, the second switch S6 to be closed, the third switch assembly 113 (for example, the third switch S3) to be opened, and the fourth switch assembly 114 (for example, the fourth switch S4) to be opened, so that the high-voltage battery 200 supplies power to the electronic driving system through the voltage conversion module 130, for example, the voltage output by the 400V high-voltage battery is boosted to 800V required by the electronic driving system through the voltage conversion module 130. When the voltage of the high-voltage battery 200 meets the working voltage of the electronic driving system, the switching states of the switches are as shown in the condition 4 in FIG. 6. Figure 5 In the condition 4, close means closed, open means opened. Specifically, the controller controls the first switch S1 to be closed, the first switch S5 to be closed, the second switch S2 to be closed, the second switch S6 to be closed, the third switch assembly 113 (for example, the third switch S3) to be opened, and the fourth switch assembly 114 (for example, the fourth switch S4) to be opened, so that the high-voltage battery 200 supplies power to the electronic driving system through the voltage conversion module 130, for example, the voltage output by the 400V high-voltage battery is boosted to 800V required by the electronic driving system through the voltage conversion module 130. When the voltage of the high-voltage battery 200 meets the working voltage of the electronic driving system, the switching states of the switches are as shown in the condition 4 in FIG. 6.

[0068] The charging voltage provided by the external charging device is not the same, for example, some direct current charging piles can provide 400V voltage, and some direct current charging piles can provide 800V voltage. Specifically, in the charging mode of the high-voltage battery 200, when the first voltage provided by the charging device is greater than or equal to the charging requirement voltage of the high-voltage battery 200, for example, the 400V or 800V direct current charging pile charges the 400V high-voltage battery, referring to the condition 1 in FIG. 6, the first switch S1 connected to the first electrode and the second switch S2 connected to the second electrode are closed, and the first switch S5 connected to the voltage conversion module 130, the second switch S6 connected to the voltage conversion module 130, the third switch assembly 113 (for example, the third switch S3), and the fourth switch assembly 114 (for example, the fourth switch S4) are opened, so that the charging device outputting the first voltage directly charges the high-voltage battery 200. Figure 4

[0069] Further, for the case that the second voltage provided by the charging device is less than the charging requirement voltage of the high-voltage battery 200, for example, the 400V charging pile charges the 800V high-voltage battery, referring to the condition 3 in FIG. 6, the first switch S1 connected to the first electrode and the second switch S2 connected to the second electrode are opened, and the first switch S5 connected to the voltage conversion module 130, the second switch S6 connected to the voltage conversion module, the third switch assembly 113 (for example, the third switch S3), and the fourth switch assembly 114 (for example, the fourth switch S4) are closed, so that the charging device outputting the second voltage charges the high-voltage battery 200 through the voltage conversion module 130 after being boosted. Figure 4

[0070] ​​In some embodiments, the connection node between the first switch S5 of the connection transformer module 130 and the first end of the transformer module 130 is used to connect one end of the first component of the electric vehicle, and the connection node between the second switch S6 of the connection transformer module 130 and the second end of the transformer module 130 is used to connect the other end of the first component of the electric vehicle. For example, Figure 4 As shown, the first component includes an EKK (electric air conditioner compressor) and a PTC (electric heater).

[0071] The connection node E between the first switch S1 and the first switch S5 connecting the first end of the charging device is also used to connect one end of the second component of the electric vehicle, and the connection node F between the second switch S2 and the second switch S6 connecting the second end of the charging device is also used to connect the other end of the second component. For example, Figure 4 As shown, the second component includes an OBC (on-board charger) and an LVDC DCDC (low-voltage DCDC converter).

[0072] In some embodiments, the transformer module 130 adopts a DCDC boost circuit structure, specifically, the transformer module 130 includes a capacitor (such as Figure 3 and Figure 4 capacitor C), an inductor, and a switch circuit; one end of the capacitor, one end of the inductor, and the first end of the switch circuit are connected to the first end of the electronic driving system and the first second end of the switch module 110, for example, the second switch S5, the other end of the capacitor and the second end of the switch circuit are connected to the second end of the electronic driving system and the second second end of the switch module 110, for example, the second switch S6; the other end of the inductor is connected to the third end of the switch circuit. The switch circuit is also used to connect the controller.

[0073] Among them, the inductor is used to store energy, the capacitor is used to smooth the voltage and reduce the voltage fluctuation, and the controller controls the switching state of the switch circuit, thereby controlling the switching frequency in the circuit and determining the storage and release of energy. By adopting a capacitor, an inductor, and a switch circuit to form a DCDC boost module, the structure is simple and easy to implement.

[0074] In some embodiments, referring to Figure 3 and Figure 4 , the inductor includes a first inductor L1 and a second inductor L2, and the switch circuit includes a fifth switch Q1, a sixth switch Q2, a seventh switch Q3, and an eighth switch Q4. Specifically, the fifth switch Q1, the sixth switch Q2, the seventh switch Q3, and the eighth switch Q4 can be any one of a MOS tube, an IGBT, and a transistor.

[0075] The fifth switch Q1 and the sixth switch Q2 are connected in series in the first branch, the seventh switch Q3 and the eighth switch Q4 are connected in series in the second branch, the first branch and the second branch are connected in parallel, and one end of the parallel connection is the first end of the switching circuit, and the other end of the parallel connection is the second end of the switching circuit. The connection node between the fifth switch Q1 and the sixth switch Q2 is the first third end of the switching circuit, used for connecting one end of the first inductor L1, and the connection node between the seventh switch Q3 and the eighth switch Q4 is the second third end of the switching circuit, used for connecting one end of the second inductor L2; the other end of the first inductor L1 and the other end of the second inductor L2 are connected to the first end of the electronic driving system and the first second end of the switching module 110. By adopting the DCDC boost circuit structure containing two inductors, the boost effect is good.

[0076] The application also provides an electric vehicle, comprising a power supply battery and the voltage conversion circuit in each of the above embodiments, and the power supply battery is connected to the voltage conversion circuit.

[0077] In some embodiments, the power supply battery is a high-voltage battery. Referring to Figure 1 、 Figure 3 and Figure 4 , the high-voltage battery can include a battery pack and two switches, and the switches can be connected to a controller. The first switch is connected to a first electrode of the battery pack, the second switch is connected to a second electrode of the battery pack, the first electrode is connected to the voltage conversion circuit through the first switch, and the second electrode is connected to the voltage conversion circuit through the second switch. When the switches are closed, the battery pack can be electrically connected to the voltage conversion circuit, and when the switches are opened, the battery pack is disconnected from the voltage conversion circuit. In this way, by using two switches, the battery pack can be conveniently controlled to be connected or not connected.

[0078] The technical features described above can be combined in any way. Although all possible combinations of these technical features are not described, any combination of these technical features should be considered to be covered by the present description, as long as such a combination does not result in a contradiction.

[0079] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A voltage conversion circuit, characterized by, The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof.

2. The voltage conversion circuit according to claim 1, characterized by The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof.

3. The voltage conversion circuit of claim 2, wherein, The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof.

4. The voltage conversion circuit according to any one of claims 1 to 3, characterized by, The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system of the electric vehicle at a third end thereof. The switching module is connected with the power supply battery of the electric vehicle at a first end thereof, connected with the voltage conversion module at a second end thereof, and connected with the electronic driving system 5. The voltage conversion circuit according to claim 4, characterized by The first switch assembly includes two first switches; the two first switches are connected in series, one end of the series is the first end of the first switch assembly, used for connecting the first electrode of the power supply battery, the other end of the series is the second end of the first switch assembly, used for connecting the variable voltage module; and / or The second switch assembly includes two second switches; the two second switches are connected in series, one end of the series is the first end of the second switch assembly, used for connecting the second electrode of the power supply battery, the other end of the series is the second end of the second switch assembly, used for connecting the variable voltage module.

6. The voltage conversion circuit of claim 5, wherein, It also includes a first charging connection line and a second charging connection line, one end of the first charging connection line is connected to the connection node between the two first switches, the other end of the first charging connection line is used for connecting the first end of the charging device; One end of the second charging connection line is connected to the connection node between the two second switches, the other end of the second charging connection line is used for connecting the second end of the charging device; The power supply battery is a high-voltage battery, when the first switch connected to the first electrode and the second switch connected to the second electrode are closed, and the first switch connected to the variable voltage module, the second switch connected to the variable voltage module, the third switch assembly and the fourth switch assembly are opened, the charging device outputting a first voltage is used to charge the high-voltage battery, the first voltage is greater than or equal to the charging requirement voltage of the high-voltage battery; When the first switch connected to the first electrode and the second switch connected to the second electrode are opened, and the first switch connected to the variable voltage module, the second switch connected to the variable voltage module, the third switch assembly and the fourth switch assembly are closed, the charging device outputting a second voltage is used to charge the high-voltage battery after being boosted by the variable voltage module, the second voltage is less than the charging requirement voltage of the high-voltage battery.

7. The voltage conversion circuit according to any one of claims 1 to 3, characterized by, The variable voltage module includes a capacitor, an inductor and a switch circuit; One end of the capacitor, one end of the inductor and the first end of the switch circuit are connected to the first end of the electronic driving system and the first second end of the switch module, the other end of the capacitor and the second end of the switch circuit are connected to the second end of the electronic driving system and the second second end of the switch module; The other end of the inductor is connected to the third end of the switch circuit.

8. The voltage conversion circuit of claim 7, wherein, The inductor includes a first inductor and a second inductor, and the switch circuit includes a fifth switch, a sixth switch, a seventh switch and an eighth switch; The fifth switch and the sixth switch are connected in series in a first branch, the seventh switch and the eighth switch are connected in series in a second branch, the first branch and the second branch are connected in parallel, one end of the parallel connection is the first end of the switch circuit, and the other end of the parallel connection is the second end of the switch circuit; The connection node between the fifth switch and the sixth switch is used as a first third end of the switch circuit, and is used for connecting one end of the first inductor; the connection node between the seventh switch and the eighth switch is used as a second third end of the switch circuit, and is used for connecting one end of the second inductor; the other end of the first inductor and the other end of the second inductor are connected to the first end of the electronic driving system and the first second end of the switch module.

9. The voltage conversion circuit according to any one of claims 1 to 3, characterized by, The controller for connecting the switch module is further included.

10. An electric vehicle, characterized by The voltage conversion circuit in any one of claims 1-9 is included, and a power supply battery is connected to the voltage conversion circuit.

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