Vehicle charging system and vehicle

Abstract

The invention relates to the field of vehicle charging, in particular to a vehicle charging system and a vehicle. The vehicle charging system includes: a charging port for providing an input voltage having a first voltage or a second voltage; the rated voltage of the vehicle-mounted battery pack is the first voltage; the charging circuit is configured to identify the magnitude of the input voltage provided by the charging port; under the condition that the input voltage is the first voltage, entering a direct charging mode, and under the direct charging mode, directly charging the vehicle-mounted battery pack by using the input voltage provided by the charging port; and when the input voltage is the second voltage, entering a boost charging mode, and in the boost charging mode, converting the input voltage provided by the charging port into the first voltage by using the vehicle-mounted electric drive module or the DCDC conversion module, and charging the vehicle-mounted battery pack by using the converted input voltage.

Description

Technical Field

[0001] The present application relates to the field of vehicle charging, and in particular, to a vehicle charging system and a vehicle. Background Art

[0002] At present, the high-voltage system platform of electric vehicles on the market is mainly DC 400V. With the maturity of related technologies and industrial chains, in order to obtain higher efficiency and faster charging experience, the next generation of high-voltage system platforms of electric vehicles may gradually evolve to 800V or higher voltage levels.

[0003] However, the reality is that most of the charging piles on the market currently only support the 400V voltage platform and cannot directly charge the power battery pack of the 800V voltage platform. In order to solve this compatibility problem, charging piles with an 800V voltage platform should be developed in theory, but given that the market promotion and technical maturity of 800V charging piles will take some time, its popularity will be difficult to expand rapidly in the short term. Therefore, how to ensure that electric vehicles with an 800V voltage system can be charged conveniently has become a thorny issue that restricts the development of the industry.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In order to solve or at least alleviate one or more of the above problems, the following technical solutions are provided: The embodiments of the present application provide a vehicle charging system and a vehicle, which are compatible with charging piles with different input voltage levels, thereby improving the charging experience of users.

[0006] According to a first aspect of the present application, a vehicle charging system is provided, comprising: a charging port for providing an input voltage having a first voltage or a second voltage; a vehicle-mounted battery pack having a rated voltage of the first voltage; and a charging circuit, configured to: identify the magnitude of the input voltage provided by the charging port; when the input voltage is the first voltage, enter a direct charging mode, in which the vehicle-mounted battery pack is directly charged using the input voltage provided by the charging port; when the input voltage is the second voltage, enter a boost charging mode, in which the input voltage provided by the charging port is converted into the first voltage using a vehicle-mounted electric drive module or a DCDC conversion module, and the vehicle-mounted battery pack is charged using the converted input voltage.

[0007] As an alternative or supplement to the above solution, in a vehicle charging system according to an embodiment of the present invention, the vehicle-mounted electric drive module includes a motor and an inverter for driving the motor, the inverter is connected in parallel at both ends of the vehicle-mounted battery pack and the neutral point of the motor is connected to the charging circuit.

[0008] As an alternative or supplement to the above scheme, in a vehicle charging system according to an embodiment of the present invention, the charging circuit includes a first switch, the first end of the charging port is connected to the third end of the vehicle battery pack via the first switch, and the second end of the charging port is connected to the fourth end of the vehicle battery pack.

[0009] As an alternative or supplement to the above solution, in a vehicle charging system according to an embodiment of the present invention, the first switch is closed in the direct charging mode, and the first switch is opened in the boost charging mode.

[0010] As an alternative or supplement to the above scheme, in a vehicle charging system according to an embodiment of the present invention, the charging circuit is further configured to: in the boost charging mode, preferentially use the on-board electric drive module to convert the input voltage provided by the charging port into the first voltage; and if the on-board electric drive module fails, use the DCDC conversion module to convert the input voltage provided by the charging port into the first voltage.

[0011] As an alternative or supplement to the above solution, in a vehicle charging system according to an embodiment of the present invention, the charging circuit further includes a second switch, and the neutral point of the motor is connected to the first end of the charging port via the second switch.

[0012] As an alternative or supplement to the above solution, in a vehicle charging system according to an embodiment of the present invention, the second switch is opened in the direct charging mode, and the second switch is closed in the boost charging mode.

[0013] As an alternative or supplement to the above solution, in a vehicle charging system according to an embodiment of the present invention, the charging circuit further includes a third switch, and the low voltage end of the DCDC conversion module is connected to the first end of the charging port via the third switch.

[0014] As an alternative or supplement to the above solution, in a vehicle charging system according to an embodiment of the present invention, the third switch is opened in the direct charging mode, and the third switch is closed in the boost charging mode.

[0015] As an alternative or supplement to the above solution, in a vehicle charging system according to an embodiment of the present invention, the vehicle charging system also includes an on-board charger module connected in parallel at both ends of the battery pack to convert the AC power provided by the charging port into DC power.

[0016] As an alternative or supplement to the above solution, in a vehicle charging system according to an embodiment of the present invention, the first voltage is 800V, and the second voltage is 400V.

[0017] According to a second aspect of the present invention, a vehicle is provided. The vehicle comprises any one of the vehicle charging systems according to the first aspect of the present invention.

[0018] The vehicle charging system according to one or more embodiments of the present invention can adapt to two charging piles with different voltage levels on the market. This solves the problem of different voltage levels and inconvenience in charging of charging piles on the current market, improves the utilization rate of charging piles on the market, and improves the convenience and compatibility of vehicle charging while saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects and advantages of the present application will become more fully apparent from the following detailed description in conjunction with the accompanying drawings, wherein the same or similar elements are represented by the same reference numerals.

[0020] Figure 1 A schematic block diagram of a vehicle charging system 10 according to one or more embodiments of the present application is shown; and

[0021] Figure 2 A schematic diagram of a vehicle charging system according to one or more embodiments of the present application is shown;

[0022] Figure 3 A schematic diagram of a vehicle charging system according to one or more embodiments of the present application is shown;

[0023] Figure 4 A schematic diagram of a vehicle charging system according to one or more embodiments of the present application is shown;

[0024] Figure 5 A schematic diagram of a vehicle charging system according to one or more embodiments of the present application is shown. DETAILED DESCRIPTION

[0025] The description of the following specific embodiments is merely exemplary in nature and is not intended to limit the disclosed technology or the application and use of the disclosed technology. In addition, it is not intended to be bound by any express or implied theory presented in the aforementioned technical field, background technology or the following specific embodiments.

[0026] Terms such as "comprising" and "including" indicate that in addition to the units and steps directly and explicitly stated in the specification, the technical solution of the present invention does not exclude the situation of having other units and steps that are not directly or explicitly stated. Terms such as "first" and "second" do not indicate the order of units in terms of time, space, size, etc., but are only used to distinguish each unit. It is understood that the technology disclosed in the present invention is generally used in electric vehicles, including but not limited to pure electric vehicles (BEV), hybrid electric vehicles (HEV), etc.

[0027] Hereinafter, various exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings.

[0028] Reference below Figure 1 , Figure 1 FIG. 1 shows a schematic block diagram of a vehicle charging system 10 according to one or more embodiments of the present application. Figure 1 As shown, the vehicle charging system 10 includes a charging port 110 , a vehicle battery pack 120 and a charging circuit 130 .

[0029] The charging port 110 can be set on the side of the vehicle body or at the bottom of the vehicle, so that after the charging plug of the charging pile is connected to the charging port 110, the electric energy in the charging pile is used to charge the vehicle battery pack 120. The charging pile can provide input voltage to the vehicle via the charging port 110. As mentioned above, the voltage levels of charging piles on the current market are different, mainly charging piles with a 400V voltage platform, and some are upgraded to charging piles with an 800V voltage platform. In order to adapt to the two commonly used charging piles of different voltage levels on the market, the vehicle charging system 10 according to the present application can identify and adapt to charging inputs of different voltage levels (that is, input voltages with a first voltage (e.g., 800V) or a second voltage (e.g., 400V), such as a DC input voltage or an AC input voltage with an amplitude of 400V or 800V), so as to effectively charge the vehicle battery pack with a rated voltage of a first voltage (e.g., 800V).

[0030] The charging circuit 130 is responsible for identifying the magnitude of the input voltage provided by the charging port 110, and switching to the corresponding charging mode according to the magnitude of the input voltage. Specifically, when the input voltage is the rated voltage of the vehicle battery pack 120 (i.e., the first voltage, such as 800V), the charging circuit 130 enters the direct charging mode; when the input voltage is lower than the rated voltage of the vehicle battery pack 120 but higher than the second voltage (such as 400V), the charging circuit 130 enters the boost charging mode. Exemplarily, the charging circuit includes a voltage identification unit or a processing unit, which can monitor the magnitude of the input voltage provided by the charging port 110. Through precise measurement, the voltage identification unit or the processing unit can determine whether the current input voltage is the first voltage or the second voltage, thereby triggering the corresponding charging mode.

[0031] In the direct charging mode, the charging circuit 130 directly uses the input voltage provided by the charging port 110 to charge the vehicle battery pack 120. This mode is suitable for the case where the input voltage matches the rated voltage of the vehicle battery pack 120. At this time, no voltage conversion is required, which can minimize energy loss and improve charging efficiency.

[0032] When the input voltage is lower than the rated voltage of the vehicle battery pack 120 (such as 800V), the charging circuit 130 enters the boost charging mode. At this time, the charging circuit 130 needs to use the vehicle electric drive module or DCDC conversion module to convert the input voltage (such as 400V) to the rated voltage required by the vehicle battery pack 120 (such as 800V). In one possible implementation, a vehicle electric drive module consisting of a motor and an inverter for driving the motor can be used to form a boost circuit. Specifically, the existing topology of the vehicle drive motor and inverter can be used to lead out the center line of the drive motor, and the inverter can be used for reverse boost control. In one possible implementation, the boost function of the DCDC conversion module (for example, a 400V-800V voltage conversion module) can be used to achieve voltage conversion.

[0033] In order to ensure the reliability and stability of the vehicle charging system 10, the boost circuit can be designed as a redundant structure for the boost charging mode. That is, after entering the boost charging mode, the vehicle-mounted electric drive module is preferentially used as a boost circuit to convert the input voltage provided by the charging port 110 into the first voltage; if the vehicle-mounted electric drive module fails and cannot complete the boost task, the system will switch to another boost mode, that is, use the DCDC conversion module to convert the input voltage provided by the charging port 110 into the first voltage.

[0034] Furthermore, the vehicle charging system 10 may also include an on-board charger (OBC) module connected in parallel at both ends of the vehicle battery pack 120. The OBC module may have an auxiliary voltage conversion function (DCDC conversion function) for converting the AC power provided by the charging port 110 into DC power to charge the vehicle battery pack 120 or serve as a DC power source for other power-consuming modules (for example, vehicle loads, such as a passenger compartment heating module or an air-conditioning compressor module).

[0035] The charging circuit 130 may include one or more switching elements. Optionally, the charging circuit 130 includes a first switch, and one end of the charging port (denoted as the first end) is connected to one end of the vehicle battery pack (denoted as the third end) via the first switch, and the other end of the charging port (denoted as the second end) is connected to the other end of the vehicle battery pack (denoted as the fourth end). Optionally, the charging circuit 130 includes a second switch, and the neutral point of the motor is connected to the first end of the charging port via the second switch. Optionally, the charging circuit 130 includes a third switch, and the low voltage end of the DCDC conversion module is connected to the first end of the charging port via the third switch. By controlling the opening or closing of the first switch, the second switch, and the third switch, the selection or switching of the direct charging mode and the boost charging mode can be achieved. The following will be combined with Figure 2-4 The following are examples to illustrate the selection and switching of modes.

[0036] Figure 2-5 A schematic diagram of a vehicle charging system according to one or more embodiments of the present application is shown.

[0037] exist Figure 2-5 In the figure, RESS is an 800V vehicle battery pack, the electric drive module is a two-in-one drive unit of motor and inverter, DCDC is an 800V and 400V voltage bidirectional conversion module, S4, S5, and S6 are switch elements, which can correspond to the first switch, the third switch, and the second switch mentioned above, respectively. Considering the actual application scenario, Figure 2 Also shown are non-essential components such as S1, S2, S3, 800V on-board charger and auxiliary power module OBC+DCDC, as well as 400V passenger compartment heating module CHCM and 400V air conditioning compressor module ACCM as loads.

[0038] like Figure 2-5 As shown, one end of the charging port (recorded as the first end) is connected to one end of the RESS (recorded as the third end) via S4, the other end of the charging port (recorded as the second end) is connected to the other end of the RESS (recorded as the fourth end), the neutral point of the motor is connected to the first end of the charging port via S6, and the low voltage end of the DCDC conversion module is connected to the first end of the charging port via S5.

[0039] When the input voltage provided by the charging port is 800V, the vehicle charging system enters the direct charging mode because the input voltage is equal to the rated voltage of the vehicle battery pack. In the direct charging mode, the switches S1, S2, S3, and S4 are closed, and the switches S5 and S6 are open. At this time, the charging current flows as follows: Figure 3 As shown by the dotted line in .

[0040] When the input voltage provided by the charging port is 400V, since the input voltage is lower than the rated voltage of the vehicle battery pack, the boost charging mode is entered to use the electric drive module or DCDC conversion module to convert the 400V input voltage to the 800V rated voltage required by the vehicle battery pack. When the electric drive module is used for boosting, the S1, S2, S3, and S6 switches are closed, and the S4 and S5 switches are open. At this time, the 400V input voltage is converted to 800V through the three-phase full-bridge power topology of the electric drive module to form a boost circuit, and then the RESS is charged. The charging current in this scenario flows as follows: Figure 4 When the DCDC conversion module is used for boosting, the switches S1, S2, S3, and S5 are closed, and the switches S4 and S6 are open. At this time, the 400V input voltage is converted to 800V by the DCDC conversion module, and then charges the RESS. The charging current in this scenario flows as follows: Figure 5 It should be noted that both the electric drive module and the DCDC conversion module have a boost function, and the two can be used as a redundant structure. When one of the modules fails or fails to work, the other module can take over the boost task to ensure that the charging process is not affected.

[0041] The vehicle charging system according to one or more embodiments of the present application can identify and adapt to charging input voltages of different voltage levels, thereby charging a vehicle-mounted battery pack with a rated voltage. Specifically, the system charging port can accept charging piles of two mainstream voltage levels from the market: 400V and 800V. This solves the problem of different voltage levels and inconvenient charging of charging piles in the current market, and improves the convenience and compatibility of vehicle charging. In addition, the charging circuit of the system has a voltage recognition function, which can automatically select the most suitable charging mode according to the input voltage level. Some implementation schemes are also designed with a redundant structure, that is, the on-board electric drive module and the DCDC conversion module are backup for each other in the boost charging mode. If any of the modules fails, the other module can immediately take over the work to ensure the continuity and stability of the charging process. This design significantly enhances the reliability and robustness of the entire charging system.

[0042] According to another aspect of the present application, a vehicle is provided, which includes any one of the vehicle charging systems described above. The vehicle may be an electric vehicle, including but not limited to a battery electric vehicle (BEV) and a hybrid electric vehicle (HEV).

[0043] The embodiments and examples set forth herein are provided to best illustrate embodiments according to the present invention and its specific applications, and thereby enable those skilled in the art to make and use the present invention. However, those skilled in the art will appreciate that the above description and examples are provided for ease of illustration and example only. The description set forth is not intended to cover all aspects of the present invention or to limit the present invention to the precise form disclosed.

Claims

1. A vehicle charging system, characterized in that: The vehicle charging system comprises: A charging port, used for providing an input voltage having a first voltage or a second voltage; an on-vehicle battery pack having a rated voltage of the first voltage; and A charging circuit configured to: Identify the magnitude of the input voltage provided by the charging port; When the input voltage is the first voltage, entering a direct charging mode, in which the vehicle-mounted battery pack is directly charged using the input voltage provided by the charging port; When the input voltage is the second voltage, the boost charging mode is entered. In the boost charging mode, the input voltage provided by the charging port is converted into the first voltage using an on-board electric drive module or a DCDC conversion module, and the converted input voltage is used to charge the on-board battery pack.

2. The vehicle charging system according to claim 1, wherein: The vehicle-mounted electric drive module includes a motor and an inverter for driving the motor. The inverter is connected in parallel to both ends of the vehicle-mounted battery pack and the neutral point of the motor is connected to the charging circuit.

3. The vehicle charging system according to claim 1, wherein: The charging circuit includes a first switch, a first end of the charging port is connected to a third end of the vehicle battery pack via the first switch, and a second end of the charging port is connected to a fourth end of the vehicle battery pack.

4. The vehicle charging system according to claim 3, wherein: The first switch is closed in the direct charging mode, and is opened in the boost charging mode.

5. The vehicle charging system according to claim 1, wherein: The charging circuit is further configured to: In the boost charging mode, preferentially using the on-board electric drive module to convert the input voltage provided by the charging port into the first voltage; and If the vehicle-mounted electric drive module fails, the DCDC conversion module is used to convert the input voltage provided by the charging port into the first voltage.

6. The vehicle charging system according to claim 3, wherein: The charging circuit further includes a second switch, and the neutral point of the motor is connected to the first end of the charging port via the second switch.

7. The vehicle charging system according to claim 6, wherein: The second switch is opened in the direct charging mode, and is closed in the boost charging mode.

8. The vehicle charging system according to claim 3, wherein: The charging circuit further includes a third switch, and the low voltage end of the DCDC conversion module is connected to the first end of the charging port via the third switch.

9. The vehicle charging system according to claim 8, wherein: The third switch is opened in the direct charging mode, and is closed in the boost charging mode.

10. The vehicle charging system according to claim 1, wherein: The vehicle charging system also includes an on-board charger module connected in parallel at both ends of the on-board battery pack to convert the alternating current provided by the charging port into direct current.

11. The vehicle charging system according to claim 1, wherein: The first voltage is 800V, and the second voltage is 400V.

12. A vehicle, characterized in that: The vehicle comprises a vehicle charging system as claimed in any one of claims 1-11.

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