Charging boosting and self-heating multiplex circuit, vehicle power system and vehicle

Abstract

The embodiment of the utility model provides a charging boosting and self-heating multiplex circuit, a vehicle power system and a vehicle. The circuit comprises: a first battery, the anode of which is connected with the anode of an external DC power supply; the anode of the second battery is connected to the cathode of the first battery and is connected with the cathode of an external direct-current power supply; the switch assembly comprises a first switch module and a second switch module; a first end of the first switch module is connected with a first battery anode for connecting an external DC power supply anode; the second end of the first switch module is connected with the first end of the second switch module and is connected between the negative electrode of the first battery and the positive electrode of the second battery through the energy storage module; the second end of the second switch module is connected with the second battery cathode. The circuit is used for achieving the effect of reducing cost.

Description

Technical Field

[0001] This application relates to the technical field of battery management, and particularly to a multiplexing circuit for charging boost and self-heating, a vehicle power system, and a vehicle. Background Art

[0002] With the development of new energy technologies, the voltage of electric vehicle power batteries is evolving from 400V to 800V or even higher voltages. However, due to the lag in the technological upgrade of the charging pile industry, there are often scenarios where the voltage of the electric vehicle power battery is higher than the output voltage of the charging pile and charging is not possible. Electric vehicles need to be equipped with voltage conversion devices, that is, boost technologies are required to charge electric vehicles.

[0003] In addition, the low-temperature performance of power batteries limits the use of electric vehicles to certain regions, and thermal insulation heating technologies for solving the low-temperature performance of power batteries have emerged accordingly.

[0004] In traditional technologies, additional power electronic conversion devices are often required for charging boost and battery heating, resulting in high costs. Summary of the Utility Model

[0005] Embodiments of this application provide a multiplexing circuit for charging boost and self-heating, a vehicle power system, and a vehicle, so as to achieve the effect of reducing the costs of the charging boost and the vehicle self-heating circuit.

[0006] In a first aspect, embodiments of this application provide a multiplexing circuit for charging boost and self-heating, and the circuit includes:

[0007] A first battery, and the positive electrode of the first battery is used to connect to the positive electrode of an external DC power supply;

[0008] A second battery, the positive electrode of the second battery is connected to the negative electrode of the first battery and is used to connect to the negative electrode of the external DC power supply;

[0009] A switch assembly, and the switch assembly includes a first switch module and a second switch module;

[0010] The first end of the first switch module is connected to the positive electrode of the first battery and is used to connect to the positive electrode of the external DC power supply; the second end of the first switch module is connected to the first end of the second switch module and is connected to the negative electrode of the first battery and the positive electrode of the second battery through an energy storage module; the second end of the second switch module is connected to the negative electrode of the second battery.

[0011] In a possible implementation manner, the circuit further includes:

[0012] A third switch module, and the energy storage module is connected to the negative electrode of the first battery and the positive electrode of the second battery through the third switch module.

[0013] In a possible implementation manner, the third switch module is a relay.

[0014] In a possible implementation, the circuit further includes:

[0015] A fourth switch module, with the first terminal of the first battery positive electrode and the first switch module connected thereto, and the positive electrode of the external DC power supply connected through the fourth switch module;

[0016] A fifth switch module, with the second battery positive electrode and the first battery negative electrode connected thereto, and the negative electrode of the external DC power supply connected through the fifth switch module.

[0017] In a possible implementation, the fourth switch module is a positive relay; the fifth switch module is a negative relay.

[0018] In a possible implementation, the circuit includes multiple components;

[0019] The first terminals of the multiple switch components are connected, and the second terminals of the multiple switch components are connected;

[0020] The third terminals of the multiple switch components are connected between the first battery negative electrode and the second battery positive electrode through different energy storage modules;

[0021] Wherein, the first terminal of the first switch module is the first terminal of the switch component; the second terminal of the second switch module is the second terminal of the switch component; the connection terminal between the second terminal of the first switch module and the first terminal of the second switch module is the third terminal of the switch component.

[0022] In a possible implementation, the first switch module is the upper bridge arm switch of the motor controller; the second switch module is the lower bridge arm switch of the motor controller.

[0023] In a possible implementation, the energy storage module is the winding inductance of the motor.

[0024] In a second aspect, an embodiment of the present application provides a vehicle power system, which includes: the charging boost and self-heating multiplexing circuit as described above.

[0025] In a third aspect, an embodiment of the present application provides a vehicle, which includes: the vehicle power system as described above.

[0026] The multiplexing circuit for charging boost and self-heating, vehicle power system, and vehicle provided by the embodiments of the present application, compared with the traditional technology, in the present application, the positive electrode of the first battery is directly connected to the positive electrode of the external DC power supply, and the negative electrode of the first battery and the positive electrode of the second battery are connected to the negative electrode of the external DC power supply, and through the connection structure between the switch assembly and the first battery and the second battery, when charging and boosting, the external DC power supply can directly charge the first battery, and charge the second battery with boost through the energy storage module; when self-heating, through the energy storage module, the first battery and the second battery can mutually charge and discharge in a cycle to realize the self-heating of the power battery. Thus, the present application can, with the positive electrode of the power battery as a reference, realize the boost charging and self-heating of the power battery in the same circuit structure, thereby reducing the circuit cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0028] Figure 1 Structural schematic of the multiplexing circuit for charging boost and self-heating provided by the present application Figure 1 ;

[0029] Figure 2 Structural schematic of the multiplexing circuit for charging boost and self-heating provided by the present application Figure 2 ;

[0030] Figure 3 Structural schematic of the multiplexing circuit for charging boost and self-heating provided by the present application Figure 3 ;

[0031] Figure 4 Structural schematic of the multiplexing circuit for charging boost and self-heating provided by the present application Figure 4 ;

[0032] Figure 5 Structural schematic of the multiplexing circuit for charging boost and self-heating provided by the present application Figure 5 ;

[0033] Figure 6 Structural schematic of the multiplexing circuit for charging boost and self-heating provided by the present application Figure 6 ;

[0034] Figure 7 Structural schematic of the multiplexing circuit for charging boost and self-heating provided by the present application Figure 7 ;

[0035] Figure 8 Structural schematic of the multiplexing circuit for charging boost and self-heating provided by the present application Figure 8 .

[0036] Reference Signs:

[0037] 110 - First battery; 120 - Second battery; 130 - Switch assembly; 131 - First switch module; 132 - Second switch module; 140 - Energy storage module; 150 - Third switch module; 160 - Fourth switch module; 170 - Fifth switch module; 200 - External DC power supply.

[0038] Through the above - mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0039] In order to make the objectives, technical solutions and advantages of the present application clearer, exemplary embodiments will be described in detail herein, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and implementation manners consistent with some aspects of the present application as detailed in the appended claims. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0040] The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims and above - mentioned drawings of the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein, for example, can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non - exclusive inclusion. For example, a series of units, systems, products or devices included do not have to be limited to those clearly listed, but may include other units not clearly listed or inherent to these products or devices.

[0041] With the development of new energy technologies, the technology of power batteries for electric vehicles has also developed rapidly, and the voltage of electric vehicle power batteries has developed from 400V to 800V or even higher voltages. However, due to the lag in the technological upgrade of the charging pile industry, there are often scenarios where the voltage of the power battery of an electric vehicle is higher than the output voltage of the charging pile and the vehicle cannot be charged. Therefore, it is necessary to set up a voltage conversion device in the electric vehicle, that is, boost technology is required to charge the electric vehicle.

[0042] In addition, the low-temperature performance of power batteries limits the usage area of electric vehicles. As a result, heat preservation and heating technologies for solving the low-temperature performance of power batteries have emerged. Common heat preservation functions include external heating and internal heating, and pulse heating is an internal heating technology.

[0043] Charge boosting and battery heating often require additional power electronic conversion devices, resulting in high costs for achieving charge boosting and battery heating.

[0044] The multiplexing circuit for charge boosting and self-heating provided in this application uses the positive electrode of the power battery as the reference ground and is designed in the same circuit, enabling the realization of two functions: charge boosting and battery heating. It can reduce the circuit costs of boosting and heating, solving the technical problem of high costs for charge boosting and battery heating.

[0045] The following uses specific embodiments to elaborate in detail on the technical solution of this application and how this technical solution solves the above technical problems. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of this application will be described below in conjunction with the accompanying drawings.

[0046] Figure 1 Schematic structure of the multiplexing circuit for charge boosting and self-heating provided in this application Figure 1 , as Figure 1 shown, this circuit includes:

[0047] The first battery 110, and the positive electrode of the first battery is used to connect to the positive electrode of the external DC power supply.

[0048] The second battery 120, the positive electrode of the second battery is connected to the negative electrode of the first battery and is used to connect to the negative electrode of the external DC power supply.

[0049] Among them, both the first battery 110 and the second battery 120 can be battery cells, battery modules, or battery packs, etc. Both the first battery 110 and the second battery 120 can be power batteries. Both the first battery 110 and the second battery 120 can be part of the power battery to provide power for the vehicle. The positive electrode of the first battery is the positive electrode of the first battery 110, and the negative electrode of the first battery is the negative electrode of the first battery 110. The positive electrode of the external DC power supply is the positive electrode of the external DC power supply 200, and the negative electrode of the external DC power supply is the negative electrode of the external DC power supply 200. The external DC power supply 200 can be a DC fast charging power supply. The positive electrode of the second battery is the positive electrode of the second battery 120.

[0050] The switch assembly 130, and the switch assembly 130 includes a first switch module 131 and a second switch module 132.

[0051] The first terminal of the first switch module 131 is connected to the positive electrode of the first battery and is used to connect to the positive electrode of an external DC power supply; the second terminal of the first switch module 131 is connected to the first terminal of the second switch module 132 and is connected through the energy storage module 140 between the negative electrode of the first battery and the positive electrode of the second battery; the second terminal of the second switch module 132 is connected to the negative electrode of the second battery.

[0052] Among them, both the first switch module 131 and the second switch module 132 can be switches for controlling the on-off of the circuit. For example, the first switch module 131 can be a switch module including a transistor.

[0053] Exemplarily, the positive electrode of the first battery 110 is used to connect to the positive electrode of the external DC power supply 200, and the negative electrode of the first battery 110 is used to connect to the negative electrode of the external DC power supply 200. The first terminal of the first switch module 131 can be respectively connected to the positive electrode of the first battery 110 and the positive electrode for connecting to the external DC power supply 200, and the second terminal of the first switch module 131 is connected between the negative electrode of the first battery 110 and the negative electrode of the external DC power supply 200. Thus, the charging and discharging of the first battery 110 can be controlled by the on-off of the first switch module 131.

[0054] The positive electrode of the second battery 120 is respectively connected to the negative electrode of the first battery and the negative electrode for connecting to the external DC power supply 200. The first terminal of the second switch module 132 is connected to the second terminal of the first switch module 131, and after the two are connected, they are respectively connected to the negative electrode of the first battery 110 and the positive electrode of the second battery 120 through the energy storage module 140; the second terminal of the second switch module 132 is connected to the negative electrode of the second battery. Thus, the charging and discharging of the second battery 120 can be controlled by the on-off of the second switch module 132.

[0055] In practical applications, during charging and boosting, as Figure 2 shown, in the first time period included in the charging and boosting cycle, the external DC power supply 200 charges the first battery 110, the first switch module 131 is turned on, and the first battery 110 charges and stores energy in the energy storage module 140 through the first switch module 131. As Figure 3 shown, in the second time period included in the driving cycle, the first switch module 131 is turned off, the second switch module 132 is turned on, and the energy storage module 140 charges the second battery 120 through the second switch module 132 to achieve boosting charging of the power battery.

[0056] During self-heating, as Figure 4 shown, in the first time period of the self-heating cycle, the first switch module 131 is turned on, and the first battery 110 charges and stores energy in the energy storage module 140 through the first switch module 131; as Figure 5As shown, in the second time period of the self-heating cycle, the first switch module 131 is turned off, and the energy storage module 140 charges the second battery 120 through the second switch module 132; as Figure 6 shown, in the third time period of the self-heating cycle, the second switch module 132 is turned on, and the second battery 120 stores energy in the energy storage module 140 through the second switch module 132; as Figure 7 shown, in the fourth time period of the self-heating cycle, the second switch module 132 is turned off, and the energy storage module 140 charges the first battery 110 through the first switch module 131. In this way, the first battery 110 and the second battery 120 are continuously charged and discharged, which is equivalent to flowing an alternating current. Due to the low-temperature internal resistance characteristic of the battery, continuous alternating current generates loss heat to achieve the purpose of low-temperature heating.

[0057] Optionally, Figures 2 to 7 the arrows in can represent the direction of current flow.

[0058] In this embodiment, taking the positive electrode of the power battery as the reference ground can reduce the application of circuit switches, save the space cost of the circuit, further reduce the cost of the multiplexing circuit, and the first battery 110 included in the power battery during boost charging is used as the direct charging object. Since the voltage of the first battery 110 is relatively stable, it is not easy to stop charging during the charging process. In the boost and simultaneous boost and heating scenarios, due to the filtering performance of the parasitic capacitance of the first battery 110, it can reduce the EMI interference to the external DC power supply 200.

[0059] The multiplexing circuit for charging boost and self-heating provided by the embodiment of the present application directly connects the positive electrode of the first battery 110 to the positive electrode of the external DC power supply, and connects between the negative electrode of the first battery 110 and the positive electrode of the second battery 120 to the negative electrode of the external DC power supply, and through the connection structure between the switch assembly 130 and the first battery 110 and the second battery 120, when charging and boosting, the external DC power supply 200 can directly charge the first battery 110 and boost charge the second battery 120 through the energy storage module 140; during self-heating, through the energy storage module 140, the first battery 110 and the second battery 120 can charge and discharge with each other in a cycle to achieve self-heating of the power battery. In this way, the present application can take the positive electrode of the power battery as the reference ground and realize boost charging and self-heating of the power battery in the same circuit structure, thereby reducing the circuit cost.

[0060] In an exemplary embodiment, as Figures 1 to 7 shown, the multiplexing circuit for charging boost and self-heating further includes:

[0061] A third switch module 150, and the energy storage module 140 is connected between the negative electrode of the first battery and the positive electrode of the second battery through the third switch module 150.

[0062] Among them, the third switch module 150 can be a switch for controlling the on / off between the energy storage module 140, the first battery 110, and the second battery 120.

[0063] Exemplarily, the first end of the energy storage module 140 is connected between the second end of the first switch module 131 and the first end of the second switch module 132. The first end of the third switch module 150 is connected to the second end of the energy storage module 140, and the second end of the third switch module 150 is connected between the negative electrode of the first battery 110 and the positive electrode of the second battery 120.

[0064] In practical applications, during the discharging process of the energy storage module 140, the first battery 110 or the second battery 120 can be charged through the freewheeling of the third switch module 150.

[0065] In this embodiment, by controlling the on / off of the circuit between the energy storage module 140, the first battery 110, and the second battery 120 through the third switch module 150, a multiplexing circuit for effectively realizing the charging boost and self-heating functions can be achieved, which is beneficial to reducing the circuit cost.

[0066] Optionally, the third switch module 150 is a relay. The on / off control of the relay can be used to control the on / off between the energy storage module 140, the first battery 110, and the second battery 120. In this way, through the third switch module 150, effective circuit on / off control can be achieved, which is beneficial to realizing the multiplexing of the charging boost and self-heating functions, thereby reducing the circuit cost.

[0067] Optionally, the multiplexing circuit for charging boost and self-heating further includes:

[0068] A fourth switch module 160, the positive electrode of the first battery and the first end of the first switch module 131 are connected, and the positive electrode of the external DC power supply is connected through the fourth switch module 160;

[0069] A fifth switch module 170, the positive electrode of the second battery and the negative electrode of the first battery are connected, and the negative electrode of the external DC power supply is connected through the fifth switch module 170.

[0070] Among them, the fourth switch module 160 can be a switch for controlling the on / off between the positive electrode of the first battery and the positive electrode of the external DC power supply. The fifth switch module 170 can be a switch for controlling the on / off between the positive electrode of the second battery, the negative electrode of the first battery, and the negative electrode of the external DC power supply.

[0071] Exemplarily, the first end of the fourth switch module 160 is respectively connected to the positive electrode of the first battery and the first end of the first switch module 131, and the second end of the fourth switch module 160 is used to connect to the positive electrode of the external DC power supply 200. In this way, the on-off between the external DC power supply 200 and the first battery 110 can be controlled through the fourth switch module 160 to achieve the charging control of the external DC power supply 200 for charging the first battery 110. The first end of the fifth switch module 170 is respectively connected to the positive electrode of the second battery, the negative electrode of the first battery, and the second end of the third relay. In this way, the on-off between the external DC power supply 200 and the first battery 110 can be controlled through the fifth switch module 170 to achieve the charging control of the external DC power supply 200 for charging the first battery 110.

[0072] It can be understood that the on-off between the fourth switch module 160 and the fifth switch module 170 should generally be used in cooperation to achieve the charging control of the power battery. For example, during charging boost, both the fourth switch module 160 and the fifth switch module 170 can be turned on so that the external DC power supply 200 can directly charge the first battery 110; during self-heating, both the fourth switch module 160 and the fifth switch module 170 can be turned off.

[0073] In this embodiment, through the application of the fourth switch module 160 and the fifth switch module 170 in the circuit, the control of the multiplexing circuit can be effectively achieved, thereby improving the reliability of the multiplexing circuit.

[0074] Optionally, the fourth switch module 160 is a positive relay; the fifth switch module 170 is a negative relay. By designing the fourth switch module 160 as a positive relay and the fifth switch module 170 as a negative relay, the reliability of charging the multiplexing circuit can be provided through the positive relay and the negative relay, and the control of the multiplexing circuit can be achieved.

[0075] In an exemplary embodiment, as Figure 8 shown, the circuit includes multiple components;

[0076] The first ends of the multiple switch components 130 are connected, and the second ends of the multiple switch components 130 are connected;

[0077] The third ends of the multiple switch components 130 are connected between the negative electrode of the first battery and the positive electrode of the second battery through different energy storage modules 140;

[0078] Among them, the first end of the first switch module 131 is the first end of the switch component 130; the second end of the second switch module 132 is the second end of the switch component 130; the connection end between the second end of the first switch module 131 and the first end of the second switch module 132 is the third end of the switch component 130.

[0079] Exemplarily, the first ends between multiple switch components 130 can be all connected, and the second ends between multiple switch components 130 can also be all connected. The third ends of multiple switch components 130 are connected between the negative electrode of the first battery and the positive electrode of the second battery through different multiple energy storage modules 140. With such a structure, a parallel mode of the switch components 130 can be formed to realize a multiplexing circuit for boosting the charging of the power battery and self-heating.

[0080] In practical applications, a higher-power boost charging of the power battery and a higher-power self-heating function of the power battery can be realized through multiple switch components 130 in a parallel mode.

[0081] In this embodiment, through the setting of multiple switch components 130, in the scenarios of boosting or heating and simultaneous boost pulse heating, the working mode of the switch components 130 can be flexibly switched for power adjustment, effectively improving the conversion efficiency, meeting the high-power requirements, and ensuring the effective use of the charging boost function and the self-heating function.

[0082] Optionally, the first switch module 131 is the upper-bridge-arm switch of the motor controller; the second switch module 132 is the lower-bridge-arm switch of the motor controller.

[0083] Exemplarily, the upper-bridge-arm switch and the lower-bridge-arm switch of the motor controller can be respectively used as the first switch module 131 and the second switch module 132. In this way, through this structural setting, the integrated boost technology and self-heating technology of the motor driver can be multiplexed, thereby further reducing the cost of the circuit and reducing the volume.

[0084] Optionally, the energy storage module 140 is the winding inductance of the motor. By setting the winding inductance of the motor as the energy storage module 140, the integrated boost technology and self-heating technology of the drive motor can be multiplexed, thereby further reducing the cost of the circuit and reducing the volume.

[0085] In an exemplary embodiment, as Figure 1 shown, the multiplexing circuit for charging boost and self-heating includes: a first battery 110, a second battery 120, a first switch module 131, a first switch module 131, a third switch module 150, a fourth switch module 160, and a fifth switch module 170. It can be understood that the setting of these components can be realized through the above various embodiments or combinations of embodiments.

[0086] In practical applications, during charging boost, as Figure 2As shown, when the fourth switch module 160, the fifth switch module 170, and the third switch module 150 are closed, the external DC power supply 200 charges the first battery 110. In the first time period included in the charging boost cycle, the first switch module 131 is driven to conduct, and the first battery 110 charges and stores energy in the energy storage module 140 through the first switch module 131 and the third switch module 150. As Figure 3 shown, in the second time period included in the driving cycle, the first switch module 131 is turned off and the second switch module 132 is turned on. The energy storage module 140 discharges through the second switch module 132 and the third switch module 150 to charge the second battery 120, so as to achieve boost charging of the power battery. The switch assembly 130 can be controlled so that the current flowing through the third switch module 150 is equal to that of the fifth switch module 170. As an example, according to the boost power requirement, as Figure 8 shown, the switch assembly 130 is correspondingly increased for the boost operation parallel mode.

[0087] During self-heating, as Figure 4 shown, the third switch module 150 is closed. In the first time period of the self-heating cycle, the first switch module 131 is turned on, and the first battery 110 charges and stores energy in the energy storage module 140 through the first switch module 131 and the third switch module 150; as Figure 5 shown, in the second time period of the self-heating cycle, the first switch module 131 is turned off, and the energy storage module 140 discharges through the second switch module 132 and the third switch module 150 to charge the second battery 120; as Figure 6 shown, in the third time period of the self-heating cycle, the second switch module 132 is turned on, and the second battery 120 stores energy in the energy storage module 140 through the second switch module 132 and the third switch module 150; as Figure 7 shown, in the fourth time period of the self-heating cycle, the second switch module 132 is turned off, and the energy storage module 140 discharges through the first switch module 131 and the third switch module 150 to charge the first battery 110. In this way, the first battery 110 and the second battery 120 are continuously charged and discharged, which is equivalent to the flow of an alternating current. Due to the low-temperature internal resistance characteristics of the battery, continuous alternating current generates loss heat to achieve the purpose of low-temperature heating. As an example, according to the heating power requirement, the switch assembly 130 can be correspondingly increased for the heating operation parallel mode. In some embodiments, when there is a DC charging condition, the fourth switch module 160 and the fifth switch module 170 are closed, and the heating energy of the power battery can be provided by the external DC power supply 200.

[0088] In this embodiment, taking the positive electrode of the power battery as the reference ground can reduce the application of circuit switches, save the space cost of the circuit, further reduce the cost of the multiplexing circuit. In boost charging, the first battery 110 included in the power battery is used as the direct charging object. Since the voltage of the first battery 110 is relatively stable, it is not likely to stop charging during the charging process. In the boost and the scenarios of both boost and heating, due to the filtering performance of the parasitic capacitance of the first battery 110, it can reduce the EMI interference to the external DC power supply 200. In the boost or heating and the scenarios of both boost pulse heating, the working mode of the switch component 130 can be flexibly switched for power adjustment, effectively improving the conversion efficiency. By multiplexing the drive motor and the motor driver to integrate the boost technology and the heating technology, the cost of the whole vehicle can be reduced and the volume can be decreased.

[0089] Optionally, as Figure 8 shown, close the fourth switch module 160, the fifth switch module 170 and the third switch module 150, control at least one switch component 130 of the motor controller to work in the boost mode, and control at least one switch component 130 of the motor controller to work in the heating mode. The remaining switch components 130 can be flexibly selected to operate in the boost mode or the heating mode in parallel with the switch components 130 in the corresponding working mode to increase the power; or the remaining switch components 130 can not work. In this way, the functions of simultaneous charging boost and self-heating can be achieved.

[0090] In an exemplary embodiment, the embodiment of the present application provides a vehicle power system, which includes: the multiplexing circuit for charging boost and self-heating as described above. Through the design of the multiplexing circuit for charging boost and self-heating as described above, the cost of the vehicle power system can be reduced.

[0091] In an exemplary embodiment, the embodiment of the present application provides a vehicle, which includes: the vehicle power system as described above. In this way, through the design of the vehicle power system as described above, the cost of the vehicle can be reduced.

[0092] In the description of this specification, the descriptions referring to terms such as "optionally", "in practical applications", "exemplary embodiments", etc. mean that the specific features, structures, materials or features described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0093] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present utility model after considering the specification and practicing the utility model disclosed herein. The present utility model is intended to cover any variations, uses, or adaptations of the present utility model, which follow the general principles of the present utility model and include well-known common knowledge or conventional technical means in the technical field not disclosed in the present utility model. It is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present utility model is only limited by the appended claims.

Claims

1. A multiplexing circuit for charging boost and self-heating, characterized in that: The circuit comprises: A first battery (110), the positive electrode of the first battery being used to connect to the positive electrode of an external DC power source; A second battery (120), the positive electrode of the second battery being connected to the negative electrode of the first battery and being used to connect to the negative electrode of the external DC power supply; A switch assembly (130), the switch assembly (130) comprising a first switch module (131) and a second switch module (132); The first end of the first switch module (131) is connected to the positive electrode of the first battery (110) and is used to connect to the positive electrode of the external DC power supply (200); the second end of the first switch module (131) is connected to the first end of the second switch module (132) and is connected between the negative electrode of the first battery and the positive electrode of the second battery through the energy storage module (140); and the second end of the second switch module (132) is connected to the negative electrode of the second battery.

2. The circuit according to claim 1, characterized in that The circuit further comprises: A third switch module (150), the energy storage module (140) is connected between the first battery negative electrode and the second battery positive electrode through the third switch module (150).

3. The circuit according to claim 2, characterized in that The third switch module (150) is a relay.

4. The circuit according to claim 1, characterized in that The circuit further comprises: a fourth switch module (160), connected to the positive electrode of the first battery and the first end of the first switch module (131), and connected to the positive electrode of the external DC power supply via the fourth switch module (160); The fifth switch module (170) is connected to the positive electrode of the second battery and the negative electrode of the first battery, and is connected to the negative electrode of the external DC power supply through the fifth switch module (170).

5. The circuit according to claim 4, characterized in that The fourth switch module (160) is a positive relay; and the fifth switch module (170) is a negative relay.

6. The circuit according to claim 1, characterized in that The circuit includes a plurality of components; The first ends of the plurality of switch components (130) are connected, and the second ends of the plurality of switch components (130) are connected; The third ends of the plurality of switch components (130) are connected between the negative electrode of the first battery (110) and the positive electrode of the second battery (120) via different energy storage modules (140); The first end of the first switch module (131) is the first end of the switch assembly (130); the second end of the second switch module (132) is the second end of the switch assembly (130); and the connection end between the second end of the first switch module (131) and the first end of the second switch module (132) is the third end of the switch assembly (130).

7. The circuit according to any one of claims 1 to 6, characterized in that: The first switch module (131) is an upper bridge arm switch of the motor controller; the second switch module (132) is a lower bridge arm switch of the motor controller.

8. The circuit according to any one of claims 1 to 6, characterized in that: The energy storage module (140) is the winding inductance of the motor.

9. A vehicle power system, characterized in that: The system comprises: a charging boost and self-heating multiplexing circuit as described in any one of claims 1 to 8.

10. A vehicle, characterized in that: include: The vehicle power system of claim 9.

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