Cooling system of extended-range electric vehicle and extended-range electric vehicle

Abstract

The utility model provides a cooling system of an extended-range electric vehicle and the extended-range electric vehicle, and relates to the technical field of new energy vehicle power systems. The cooling system comprises a first cooling loop independently arranged for the methanol engine and a second cooling loop used for cooling other heating parts under the running condition of the range-extended electric vehicle, and the first cooling loop and the second cooling loop are both coupled to an electric control valve; and under the condition that the electric control valve communicates with the first cooling loop and the second cooling loop, the first cooling loop and the second cooling loop conduct heat exchange so as to preheat the methanol engine. Through the application, the problem of difficult cold start of the methanol engine is solved on the premise of not changing the structure of the range extender.

Description

Cooling system of range-extended electric vehicle and range-extended electric vehicle Technical Field

[0001] This application relates to the field of new energy vehicle power system technology, and in particular to a cooling system for a range-extended electric vehicle and the range-extended electric vehicle. Background Technology

[0002] Range-extended electric vehicles (REEVs), as a type of new energy vehicle with unique advantages, combine the zero emissions of pure electric vehicles with the range advantage of gasoline vehicles, making them popular in the market. Methanol, as a clean and renewable alternative fuel, has advantages such as high combustion efficiency and clean emissions, and is considered one of the ideal fuels for engines in range extenders. Engines that use methanol as fuel are called methanol engines. However, due to the high latent heat of vaporization of methanol, methanol engines are difficult to start in cold conditions.

[0003] Currently, to address the difficulty of cold starting methanol engines, an auxiliary heating device is typically added to heat the engine and assist in starting, thereby improving the vaporization efficiency of methanol and achieving reliable starting. However, this method requires an additional auxiliary heating device, complicating the structure of the range extender. Summary of the Invention

[0004] This application provides a cooling system for a range-extended electric vehicle and a range-extended electric vehicle, which solves the problem of difficult cold start of methanol engines without changing the structure of the range extender.

[0005] In a first aspect, this application provides a cooling system for a range-extended electric vehicle, comprising: a first cooling circuit separately provided for a methanol engine, and a second cooling circuit for cooling other heat-generating components during the operation of the range-extended electric vehicle, wherein both the first cooling circuit and the second cooling circuit are coupled to an electronically controlled valve.

[0006] With the electronically controlled valve connecting the first cooling circuit and the second cooling circuit, the first cooling circuit and the second cooling circuit exchange heat to preheat the methanol engine.

[0007] In one possible implementation, the electrically controlled valve is an electrically controlled multi-way valve.

[0008] In one possible implementation, the electrically controlled multi-way valve includes:

[0009] The valve body has multiple interconnected channels. The first and second channels are connected to the first cooling circuit, and the third and fourth channels are connected to the second cooling circuit.

[0010] A switching assembly used for switching between different channels in multiple channels.

[0011] In one possible implementation, the switching assembly includes a drive mechanism and a stop plate, the stop plate being rotated or slid under the drive mechanism to switch different channels among multiple channels.

[0012] In one possible implementation, the switching assembly includes multiple stop plates and telescopic mechanisms connected to the stop plates. The stop plates switch different channels among the multiple channels by telescopic action of the corresponding telescopic mechanisms.

[0013] In one possible implementation, the electronically controlled valve connects the first cooling circuit and the second cooling circuit, including: the first cooling circuit and the second cooling circuit forming a series circuit.

[0014] In one possible implementation, other heat-generating components include a drive motor and / or a motor controller.

[0015] In one possible implementation, the first cooling circuit further includes a generator; or, the second cooling circuit further includes a generator.

[0016] In one possible implementation, when the electronically controlled valve connects the first cooling circuit and the second cooling circuit, the heat dissipation component in the first cooling circuit operates at a first power, which is less than a second power. The second power is the operating power of the heat dissipation component when the first cooling circuit and the second cooling circuit are not connected.

[0017] Secondly, this application provides a range-extended electric vehicle, comprising:

[0018] Vehicle body;

[0019] The cooling system as described in the first aspect and / or various possible embodiments of the first aspect.

[0020] This application provides a cooling system for a range-extended electric vehicle and the range-extended electric vehicle itself, relating to the field of new energy vehicle powertrain technology. The cooling system includes a first cooling circuit specifically designed for the methanol engine, and a second cooling circuit for cooling other heat-generating components during the operation of the range-extended electric vehicle. Both the first and second cooling circuits are coupled to an electronically controlled valve. When the electronically controlled valve connects the first and second cooling circuits, the first and second cooling circuits exchange heat to preheat the methanol engine. The cooling system of this application includes two cooling circuits: the first cooling circuit is specifically designed for the methanol engine, and the second cooling circuit is designed for other heat-generating components besides the methanol engine during the operation of the range-extended electric vehicle. The first and second cooling circuits are connected via an electronically controlled valve. When the electronically controlled valve connects the first and second cooling circuits, the second cooling circuit exchanges heat with the first cooling circuit, utilizing the waste heat from other heat-generating components to preheat the methanol engine in the first cooling circuit. This solves the problem of difficult cold starts for methanol engines without changing the structure of the range extender. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0022] Figure 1 is a schematic diagram of the cooling system of a range-extended electric vehicle provided in an embodiment of this application;

[0023] Figure 2 is a schematic diagram of the cooling system of the range-extended electric vehicle provided in the embodiment of this application;

[0024] Figure 3 is a schematic diagram of the circulation path of the cooling medium in the cooling system when the methanol engine is not working, according to an embodiment of this application.

[0025] Figure 4 is a schematic diagram of the circulation path of the cooling medium in the cooling system under methanol engine operating conditions provided in the embodiments of this application.

[0026] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0027] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0028] Methanol, as a clean and renewable alternative fuel, shows great potential in the internal combustion engine field, especially in range extender applications. Range extenders, as an auxiliary power source for electric vehicles, can effectively alleviate range anxiety, and the adoption of methanol fuel is expected to further improve their environmental performance. More importantly, as a renewable fuel, methanol has a significant economic advantage over other fuels, leading to a growing market share of vehicles equipped with methanol range extenders. Methanol range extenders typically consist of a methanol engine and a generator, but their starting performance in low-temperature environments has remained a key bottleneck restricting their widespread application.

[0029] Specifically, methanol engines are difficult to start in cold weather, mainly due to the physicochemical properties of methanol. Compared to traditional gasoline, methanol is less volatile, making it more difficult to evaporate and form a combustible mixture at low temperatures. This results in insufficient air-fuel mixture concentration in the cylinder, making it difficult to start a methanol engine.

[0030] In addition, methanol has a high latent heat of vaporization, which means that it requires more heat to evaporate. In cold weather, the cylinder temperature of a methanol engine is low, making it difficult to provide enough heat, which further exacerbates the difficulty in forming a mixture.

[0031] To address these issues, a common solution is to use auxiliary heating devices, such as electric heaters, to heat the intake manifold or fuel injectors of the methanol engine, thereby improving methanol vaporization efficiency. However, this approach requires additional energy input and alters the structure of the methanol range extender, complicating its design.

[0032] Another common solution is to incorporate a gasoline-assisted starting system. This requires designing two independent fuel supply systems: one for gasoline and the other for methanol. During the cold start phase, the control system prioritizes activating the gasoline supply system, injecting gasoline into the cylinders via injectors to mix with air and form a combustible mixture. The ignition system then ignites the mixture, driving the methanol engine to start. As the methanol engine temperature rises, the control system gradually reduces the gasoline injection while increasing the methanol injection. This process is a smooth transition to ensure the smooth operation of the methanol engine and avoid stalling or performance degradation due to fuel switching. Finally, when the methanol engine reaches the preset temperature, the gasoline supply system completely shuts off, and the methanol engine runs entirely on methanol fuel. This solution effectively utilizes the excellent low-temperature starting performance of gasoline, overcoming the difficulty of cold starting methanol engines and ensuring reliable starting of the methanol engine under various ambient temperatures. However, this solution requires an additional gasoline supply system, increasing the complexity and cost of the entire system.

[0033] To address the aforementioned technical problems, this application provides a cooling system for a range-extended electric vehicle and the range-extended electric vehicle itself. This system utilizes a first cooling circuit specifically designed for the methanol engine, and a second cooling circuit for cooling other heat-generating components during the operation of the range-extended electric vehicle. Both the first and second cooling circuits are connected to an electronically controlled valve. This allows the methanol engine to utilize the residual heat from other heat-generating components for preheating when the electronically controlled valve connects the first and second cooling circuits, thereby solving the problem of difficult cold starts for the methanol engine in low-temperature environments.

[0034] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0035] Figure 1 is a schematic diagram of a cooling system for a range-extended electric vehicle according to an embodiment of this application. As shown in Figure 1, the cooling system includes:

[0036] A first cooling circuit 101 is provided separately for the methanol engine, and a second cooling circuit 102 is used to cool other heat-generating components during the operation of the range-extended electric vehicle. Both the first cooling circuit and the second cooling circuit are coupled to the electronically controlled valve 103.

[0037] With the electronically controlled valve connecting the first cooling circuit and the second cooling circuit, the first cooling circuit and the second cooling circuit exchange heat to preheat the methanol engine.

[0038] In this embodiment, it can be understood that the cooling system includes a first cooling circuit and a second cooling circuit, wherein the first cooling circuit is a cooling circuit specifically designed for the methanol engine, and the second cooling circuit is a cooling circuit designed for other heat-generating components besides the methanol engine when the range-extended electric vehicle is in operation.

[0039] If the electronically controlled valve connects the first cooling circuit and the second cooling circuit, the first cooling circuit will exchange heat with the second cooling circuit, transferring the heat generated by other heat-generating components to the methanol engine, thereby preheating the methanol engine and bringing it to a temperature that allows for cold start.

[0040] Furthermore, whether the electronically controlled valve connects the first cooling circuit and the second cooling circuit is determined by the battery capacity of the range-extended electric vehicle and the operating power of the heat dissipation components of the first and second cooling circuits.

[0041] Specifically, when the electronically controlled valve connects the first cooling circuit and the second cooling circuit, the heat dissipation component in the first cooling circuit operates at a first power, which is less than the second power. The second power is the operating power of the heat dissipation component when the first cooling circuit and the second cooling circuit are not connected.

[0042] The operating power of the heat dissipation component can be reflected by the temperature of the cooling medium flowing out of the heat dissipation component. This means that when the electronically controlled valve connects the first cooling circuit and the second cooling circuit, the temperature of the cooling medium flowing out of the heat dissipation component in the first cooling circuit is lower than the temperature of the cooling medium flowing out of the heat dissipation component in the second cooling circuit. The temperature of the cooling medium is collected by a temperature sensor, which means that temperature sensors need to be installed in both the first and second cooling circuits, respectively, at the outlet end of the heat dissipation component in the corresponding circuit. In this embodiment, the electronically controlled valve connects the first and second cooling circuits only when the first power is less than the second power. This avoids the transfer of heat from the first cooling circuit to other heat-generating components in the second cooling circuit, preventing heat dissipation from these components and thus affecting their normal operation.

[0043] In addition, when the electronic control valve connects the first cooling circuit and the second cooling circuit, the battery capacity of the range-extended electric vehicle must be greater than or equal to the battery capacity threshold. The battery capacity threshold can be selected according to actual needs, for example, the battery capacity threshold can be set to 40kWh.

[0044] In this system, the battery level of the range-extended electric vehicle is obtained from the battery management system. This means that when the battery management system obtains the current battery level of the range-extended electric vehicle and transmits it to the vehicle controller, the vehicle controller compares the current battery level with a battery level threshold. If the current battery level is greater than or equal to the threshold, the controller will control the electronically controlled valve to connect the first and second cooling circuits.

[0045] In summary, it can be understood that the electronically controlled valve needs to meet both of the above conditions to connect the first and second cooling circuits, which is beneficial to the normal operation of the range-extended electric vehicle.

[0046] The cooling system of this application embodiment includes two cooling circuits. The first cooling circuit is a cooling circuit specifically designed for the methanol engine, and the second cooling circuit is a cooling circuit designed for other heat-generating components besides the methanol engine when the range-extended electric vehicle is in operation. The first cooling circuit and the second cooling circuit are connected by an electronically controlled valve. When the electronically controlled valve connects the first cooling circuit and the second cooling circuit, the second cooling circuit exchanges heat with the first cooling circuit, thereby utilizing the waste heat of other heat-generating components to preheat the methanol engine in the first cooling circuit. This solves the problem of difficult cold start of the methanol engine without changing the structure of the range extender.

[0047] In some implementations, the electrically controlled valve is an electrically controlled multi-way valve. An electrically controlled valve is a valve whose opening, closing, or flow regulation is controlled by electrical signals. An electrically controlled multi-way valve, however, further expands the functionality of an electrically controlled valve. It can not only control the flow of fluid but also switch between different channels to achieve the switching and control of multiple fluid circuits. In other words, an electrically controlled multi-way valve is like a traffic hub, with multiple internal channels. Through electrical signal control, different channels can be connected or disconnected specifically, thereby achieving the switching and distribution of different cooling media in different channels. Through electrically controlled multi-way valves, precise control and flexible distribution of the cooling media can be achieved.

[0048] In some embodiments, the electrically controlled multi-way valve includes: a valve body, wherein a plurality of interconnected channels are provided within the valve body, wherein a first channel and a second channel are connected to a first cooling circuit, and a third channel and a fourth channel are connected to a second cooling circuit; and a switching assembly for switching different channels among the plurality of channels.

[0049] In one implementation, the aforementioned switching assembly includes a drive structure and a stop plate. The stop plate rotates or slides under the drive of the drive mechanism to switch different channels among the plurality of channels. In this implementation, the switching assembly has a stop plate and a drive mechanism. The stop plate is connected to the drive end of the drive mechanism, allowing the stop plate to rotate or slide under the drive of the drive mechanism, thereby achieving switching of different channels among the plurality of channels. For example, the switching assembly includes a stop plate and a drive structure, wherein the stop plate is located at the center of the electrically controlled multi-way valve, and the stop plate rotates or slides under the drive of the drive mechanism.

[0050] In another implementation, the aforementioned switching assembly includes multiple stop plates and telescopic mechanisms corresponding to the stop plates. The stop plates switch different channels among the multiple channels under the telescopic action of the corresponding telescopic mechanisms. In this implementation, the switching assembly includes multiple stop plates and telescopic mechanisms corresponding to the stop plates. The stop plates are connected to the telescopic ends of the corresponding telescopic mechanisms, allowing the stop plates to switch different channels among the multiple channels under the telescopic action of the corresponding telescopic mechanisms. For example, the switching assembly includes two stop plates and telescopic structures corresponding to the stop plates. One stop plate is located at the center of the electrically controlled multi-way valve, and the other stop plate is perpendicular to the first stop plate. The stop plates switch different channels among the multiple channels under the telescopic action of the corresponding telescopic mechanisms.

[0051] This application provides different implementation methods for switching components so that users can choose according to actual needs, thereby improving the flexibility of the cooling system.

[0052] Furthermore, in this embodiment, an electronically controlled multi-way valve is used to connect the first cooling circuit and the second cooling circuit. This allows the heat from other heat-generating components to be directly utilized for the preheating of the methanol engine when the electronically controlled multi-way valve connects the first cooling circuit and the second cooling circuit. This simplifies the structural layout of the cooling system, saves energy, and has better economic benefits.

[0053] Furthermore, the electronically controlled valve described above connecting the first and second cooling circuits includes: the first and second cooling circuits forming a series circuit. This means that the electronically controlled valve connecting the first and second cooling circuits refers to the first and second cooling circuits forming a series circuit. This series circuit allows the cooling system to directly utilize the heat from other heat-generating components for preheating the methanol engine, thus saving energy.

[0054] Based on the above embodiments, other heat-generating components include a drive motor and / or a motor controller. The drive motor, which provides driving force to the vehicle, is one of the core components of a range-extended electric vehicle (REEV). It converts electrical energy into mechanical energy to directly drive the vehicle's wheels, thus enabling the REEV to move. The motor controller is a crucial component in REEVs and other devices that use motors. Its function is to control the drive motor's speed, torque, and steering, thereby enabling functions such as acceleration, deceleration, cruising, and braking. It should be noted that the drive motor and motor controller operate continuously during REEV operation, constantly generating heat. The methanol engine, however, does not operate and remains in a stopped state when the vehicle's battery level is greater than or equal to a certain threshold. It only starts operating when the battery level falls below the threshold.

[0055] This application embodiment provides heat to the methanol engine by continuously running a heat-generating drive motor and / or motor controller while the range-extended electric vehicle is in operation, thereby preheating the methanol engine and enabling it to achieve cold start in cold weather.

[0056] In some embodiments, the first cooling circuit further includes a generator; or, the second cooling circuit further includes a generator. In these embodiments, it is understood that the cooling system also includes a generator, which may be located in either the first or the second cooling circuit. The specific arrangement can be selected according to actual needs.

[0057] Next, examples will be provided to illustrate how to utilize the cooling system of the range-extended electric vehicle provided in this application embodiment. Figure 2 is a schematic diagram of the cooling system of the range-extended electric vehicle provided in this application embodiment. As can be seen from Figure 2, the cooling system includes a first cooling system and a second cooling system. The first cooling circuit includes a methanol engine, a heat dissipation component, and a temperature sensor. The second cooling circuit includes a motor controller, a drive motor, a generator, a temperature sensor, and a heat dissipation component. The heat dissipation component consists of a radiator and a fan.

[0058] Furthermore, when the range-extended electric vehicle battery is fully charged, the methanol engine is not operating, and the circulation path of the cooling medium in the cooling system is shown in Figure 3. Figure 3 is a schematic diagram of the circulation path of the cooling medium in the cooling system when the methanol engine is not operating, as provided in the embodiment of this application.

[0059] As shown in Figure 3, the cooling medium flowing from the heat dissipation components in the first cooling circuit passes through the temperature sensor. From the temperature sensor, the cooling medium flows out through port a2 of the electronically controlled multi-way valve, then to port a4, and finally to the heat dissipation components in the second cooling circuit. From the heat dissipation components in the second cooling circuit, the cooling medium flows sequentially through the temperature sensor, the motor controller, the drive motor, and the generator. From the generator, the cooling medium flows in through port a3 of the electronically controlled multi-way valve, then out through port a1, and finally to the methanol engine. This process maintains the cooling medium in the methanol engine at a relatively high temperature, ensuring a smooth cold start. Once started, the methanol engine drives the generator to generate electricity, providing power to the vehicle. In other words, this method enables the cold start of the methanol range extender.

[0060] Furthermore, when the battery of the range-extended electric vehicle is insufficient, the methanol engine operates, and the circulation path of the cooling medium in the cooling system is shown in Figure 4. Figure 4 is a schematic diagram of the circulation path of the cooling medium in the cooling system when the methanol engine is operating, as provided in an embodiment of this application.

[0061] As shown in Figure 4, the cooling medium flowing from the heat dissipation components in the first cooling circuit flows to the temperature sensor. From the temperature sensor, the cooling medium flows out through port a2 of the electronically controlled multi-way valve, then to port a1 of the electronically controlled multi-way valve, and finally to the methanol engine. The cooling medium flowing from the heat dissipation components in the second cooling circuit flows sequentially through the temperature sensor, the motor controller, the drive motor, and the generator. The cooling medium flowing out from the generator flows in through port a3 of the electronically controlled multi-way valve, then flows out through port a4 of the electronically controlled multi-way valve, returning to the heat dissipation components in the second cooling circuit.

[0062] When the battery capacity of a range-extended electric vehicle is insufficient, the first cooling circuit and the second cooling circuit operate independently without affecting each other.

[0063] In summary, the cooling system of the range-extended electric vehicle provided in this application adds an electronically controlled four-way valve between the second cooling circuit and the first cooling circuit, connecting the two cooling circuits in series. By controlling the conduction of different branches of the four-way valve, the system utilizes the waste heat of the second cooling circuit to heat the cooling medium of the methanol engine, thereby maintaining the cooling medium water temperature of the methanol range extender at a relatively high level and ensuring a smooth cold start for the methanol range extender.

[0064] Furthermore, compared with the gasoline-assisted starting scheme, the cooling system heating scheme provided in this application embodiment simplifies the system complexity, and the vehicle only needs to add methanol fuel, without the need to add gasoline, reducing the cost of use and maintenance difficulty; compared with the scheme of adding an auxiliary heating device to heat the methanol engine for auxiliary starting, the cooling system scheme provided in this application embodiment cleverly utilizes the waste heat of the electric drive cooling circuit to heat the methanol engine coolant, which not only simplifies the scheme layout, but also saves energy, thereby improving economy, wherein the electric drive cooling circuit is the second cooling circuit.

[0065] This application also provides a range-extended electric vehicle, including: a vehicle body; and a cooling system as described in the preceding embodiments.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] In the description of the embodiments of this application, it should be understood that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection or an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. The terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "multiple" means two or more, unless otherwise precisely specified.

[0068] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cooling system for a range-extended electric vehicle, characterized in that, include: A first cooling circuit is provided separately for the methanol engine, and a second cooling circuit is provided for cooling other heat-generating components during the operation of the range-extended electric vehicle. Both the first cooling circuit and the second cooling circuit are coupled to an electronically controlled valve. When the electronically controlled valve connects the first cooling circuit and the second cooling circuit, the first cooling circuit and the second cooling circuit exchange heat to preheat the methanol engine.

2. The cooling system according to claim 1, characterized in that, The electrically controlled valve is an electrically controlled multi-way valve.

3. The cooling system according to claim 2, characterized in that, The electrically controlled multi-way valve includes: a valve body, wherein multiple interconnected channels are provided within the valve body, wherein a first channel and a second channel are connected to a first cooling circuit, and a third channel and a fourth channel are connected to a second cooling circuit; and a switching assembly for switching different channels among the multiple channels.

4. The cooling system according to claim 3, characterized in that, The switching assembly includes a driving mechanism and a stop plate. The stop plate rotates or slides under the drive of the driving mechanism to switch different channels among the plurality of channels.

5. The cooling system according to claim 3, characterized in that, The switching assembly includes multiple cut-off plates and telescopic mechanisms connected to the cut-off plates. The cut-off plates switch different channels among the multiple channels by telescopic action of the corresponding telescopic mechanisms.

6. The cooling system according to any one of claims 1 to 5, characterized in that, The electronically controlled valve connects the first cooling circuit and the second cooling circuit, including: the first cooling circuit and the second cooling circuit forming a series circuit.

7. The cooling system according to any one of claims 1 to 5, characterized in that, The other heat-generating components include a drive motor and / or a motor controller.

8. The cooling system according to claim 7, characterized in that, The first cooling circuit further includes a generator; or, the second cooling circuit further includes a generator.

9. The cooling system according to any one of claims 1 to 5, characterized in that, When the electronically controlled valve connects the first cooling circuit and the second cooling circuit, the heat dissipation component in the first cooling circuit operates at a first power, which is less than a second power. The second power is the operating power of the heat dissipation component when the first cooling circuit and the second cooling circuit are not connected.

10. A range-extended electric vehicle, characterized in that, include: The vehicle body; the cooling system as described in any one of claims 1 to 9.

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