Extended-range electric vehicle low-temperature starting system and low-temperature starting method

Abstract

This invention discloses a low-temperature starting system for range-extended electric vehicles, featuring a low-temperature starting mode. The motor assembly includes a travel motor for driving the wheels of the range-extended vehicle and / or a working motor for driving the working device of the range-extended vehicle. The power battery is electrically connected to the range extender assembly and the load device. The energy transfer device is connected in parallel with the load device, and the entire parallel connection is electrically connected to the range extender assembly. The vehicle controller is signal-connected to the range extender assembly, the low-temperature starting device, the power battery, the load device, and the energy transfer device. When the vehicle controller detects that the temperature of the power battery is lower than the discharge temperature and in the low-temperature starting mode, the vehicle controller controls the range extender assembly to electrically connect to the motor assembly to drive the motor assembly. When the vehicle controller detects that the motor assembly is in a state of rapid power decline, the vehicle controller controls the on / off switching device to connect to electrically connect the range extender assembly and the energy transfer device.

Description

Technical Field

[0001] This invention relates to the field of range-extended electric vehicle technology, and in particular to a low-temperature starting system and method for range-extended electric vehicles. Background Technology

[0002] In the automotive field, range-extended electric vehicles (REEVs) are a type of new energy electric vehicle. They are built by adding a range extender assembly to a pure electric vehicle, providing electrical energy to maintain continuous driving and extend the vehicle's range. Current range extender assemblies often combine an internal combustion engine and a generator. During operation, the internal combustion engine drives the generator to charge the battery, or the engine drives the generator to power the vehicle's drive motor and other load devices. The range extender assembly cannot supply power to the vehicle's load independently. If it does, a significant difference between the power output of the range extender assembly and the load demand can damage the drive motor and other load devices, and even lead to safety issues. REEVs may be used in low-temperature environments where the battery temperature may drop below the permissible discharge temperature. In such cases, the range extender assembly must be started to heat the battery until the battery temperature rises above the permissible discharge temperature before power supply can resume. However, for vehicles requiring rapid operation, such as emergency rescue vehicles, this approach is insufficient. Summary of the Invention

[0003] The purpose of this invention is to provide a low-temperature starting system for range-extended electric vehicles that can start quickly in low-temperature environments.

[0004] This invention discloses a low-temperature starting system for range-extended electric vehicles, featuring a low-temperature starting mode. The system includes: a range extender assembly, a range extender low-temperature starting device, a vehicle controller, a power battery, a load device, and a power transfer device. The power transfer device includes a power transfer component and an on / off switching component. The load device includes a motor assembly, comprising a travel motor for driving the wheels of the range-extended vehicle and / or a working motor for driving the working devices of the range-extended vehicle. The power battery is electrically connected to the range extender assembly and the load device. The power transfer device is connected in parallel with the load device. The entire system is electrically connected to the range extender assembly. The vehicle controller is signal-connected to the range extender assembly, the range extender low-temperature starting device, the power battery, the load device, and the power transfer device. When the vehicle controller detects that the temperature of the power battery is lower than the discharge temperature and in low-temperature starting mode, the vehicle controller controls the range extender assembly to be electrically connected to the motor assembly to drive the motor assembly to work. When the vehicle controller detects that the motor assembly is in a state of rapid power decline, the vehicle controller controls the on / off switching device to be connected so that the range extender assembly is electrically connected to the power transfer device.

[0005] In some embodiments, the power transfer device includes a storage capacitor, a power-consuming resistor, or a storage capacitor and a power-consuming resistor connected in series.

[0006] In some embodiments, the power transfer device includes a storage capacitor and a power-consuming resistor connected in series, and the on / off switching device includes two switches connected in series with the storage capacitor and the power-consuming resistor and respectively located on the storage capacitor and the power-consuming resistor connected in series.

[0007] In some embodiments, a battery heating device is further included for heating the power battery. When the vehicle controller detects that the temperature of the power battery is lower than the discharge temperature and in a low-temperature start-up mode, the vehicle controller controls the range extender assembly to be electrically connected to the battery heating device to heat the power battery. The vehicle controller calculates the maximum heating power of the battery heating device that matches the real-time temperature of the power battery, and before the temperature of the power battery reaches the discharge temperature, the electrical power output by the range extender assembly ensures that the heating power of the battery heating device first meets the maximum heating power that matches the real-time temperature of the power battery.

[0008] In some embodiments, a low-temperature starting system for an emergency rescue vehicle is included, wherein the motor assembly includes a drive motor for driving the wheels of the emergency rescue vehicle and a working hydraulic pump drive motor for driving the working hydraulic pump of the emergency rescue vehicle.

[0009] A second aspect of this invention discloses a low-temperature starting method for a range-extended electric vehicle using any of the described low-temperature starting systems, comprising:

[0010] When the vehicle controller detects that the temperature of the power battery is lower than the discharge temperature, it enters the low-temperature start-up mode: it controls the range extender assembly to be electrically connected to the motor assembly to drive the motor assembly to work, and when it detects that the motor assembly is in a state of rapid power decline, the vehicle controller controls the on / off switching device to connect to transfer part of the electrical power of the range extender assembly to the power transfer device.

[0011] In some embodiments, the range-extended electric vehicle low-temperature starting system further includes a battery heating device for heating the power battery. The low-temperature starting mode includes: controlling the range extender assembly to be electrically connected to the battery heating device to heat the power battery; calculating the maximum heating power of the battery heating device that matches the real-time temperature of the power battery based on the real-time temperature of the power battery; and ensuring that the electrical power output by the range extender assembly before the temperature of the power battery reaches the dischargeable temperature so that the heating power of the battery heating device first meets the maximum heating power that matches the real-time temperature of the power battery.

[0012] In some embodiments, the power transfer device includes a storage capacitor and a power-consuming resistor connected in parallel, and the on / off switching device includes a first switch and a second switch for controlling whether the storage capacitor and the power-consuming resistor are electrically connected to the range extender assembly, respectively. The low-temperature start-up mode includes: when the motor assembly is detected to be in a state of rapid power decline, firstly controlling the second switch to open to transfer part of the power of the range extender assembly to the power-consuming resistor; when the power consumption of the power-consuming resistor is detected to reach the maximum design power, controlling the first switch to open to transfer part of the power of the range extender assembly to the storage capacitor.

[0013] In some embodiments, the range-extended electric vehicle low-temperature starting system further includes a battery heating device for heating the power battery. The low-temperature starting mode includes: controlling the range extender assembly to be electrically connected to the battery heating device to heat the power battery; the low-temperature starting method further includes exiting the low-temperature starting mode after detecting that the temperature of the power battery has reached the discharge temperature, disconnecting the power-consuming resistor and the power-storing capacitor from the range extender assembly, and when it is detected that the power-storing capacitor stores electricity, connecting the power-storing capacitor to the power-consuming resistor so that the power-consuming resistor consumes the electricity of the power-storing capacitor.

[0014] Based on the low-temperature starting system for range-extended electric vehicles provided by this invention, by setting up a power transfer device and a load device connected in parallel, and the entire parallel connection being electrically connected to the range extender assembly, the range extender assembly can independently provide electrical power to the load device in low-temperature starting mode, enabling the electric vehicle to start quickly at low temperatures. When the motor assembly is in a state of rapid power decline, the vehicle controller can control the on / off switching device to connect so that the range extender assembly and the power transfer device are electrically connected, realizing the power transfer of the power transfer device and ensuring the safety of the motor assembly.

[0015] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of a low-temperature starting system for electric vehicles according to an embodiment of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0020] In the description of this invention, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0023] The low-temperature starting system for the range-extended electric vehicle in this embodiment has a low-temperature starting mode. The low-temperature starting system for the range-extended electric vehicle includes: a range extender assembly 11, a range extender low-temperature starting device, a vehicle controller 12, a power battery 15, a load device 13, and a power transfer device.

[0024] In low-temperature start-up mode, the range extender assembly is started via the range extender low-temperature start-up device. The range extender low-temperature start-up device includes a low-temperature, low-voltage battery, a coolant heater, an intake air heater, and an engine starter motor. This device is a conventional and mature product structure in existing technology, offering high reliability and fast start-up, meeting the rapid response requirements of electric vehicles such as emergency rescue equipment.

[0025] The power transfer device includes a power transfer component 14 and an on / off switching component. The load device 13 includes a motor assembly, which includes a travel motor for driving the wheels of the range-extended vehicle and / or a working motor for driving the working device of the range-extended vehicle. The power battery 15 is electrically connected to the range extender assembly 11 and the load device 13. The power transfer device and the load device 13 are connected in parallel, and the entire parallel connection is electrically connected to the range extender assembly 11. The vehicle controller 12 is signal-connected to the range extender assembly 11, the range extender low-temperature starting device, the power battery 15, the load device 13, and the power transfer component 14. Signal connection refers to the transmission of control signals or data signals through wired or wireless connections, etc. Figure 1 The dashed lines shown indicate signal connections between the vehicle controller and other devices. Electrical connections refer to connections capable of transmitting current. For example... Figure 1 As shown, the two ends of the power transfer device are electrically connected to the two ends of the load device 13 to achieve a parallel connection between them. The switching device includes several electrical switches that can disconnect or open the electrical connection between the power transfer device 14 and the range extender assembly. In the embodiment shown, this includes a first electrical switch 21 and a second electrical switch 22. The power battery discharges at normal temperatures to drive the electric vehicle's operation. The power battery includes a high-voltage battery pack for charging and discharging. Existing power batteries are not allowed to be charged or discharged at low temperatures, such as below -10 degrees Celsius.

[0026] When the vehicle controller 12 detects that the temperature of the power battery 15 is lower than the discharge temperature (e.g., -15°C), the vehicle controller 12 switches to the low-temperature start-up mode. In this low-temperature start-up mode, the vehicle controller 12 closes the third electrical switch 23 between the power battery 15 and the load device, and closes the fourth electrical switch 24 between the power battery 15 and the range extender assembly to shut down charging and discharging. The vehicle controller 12 controls the sixth electrical switch 26 and the seventh electrical switch 27 between the range extender assembly 11 and the motor assembly to open to achieve electrical connection and drive the motor assembly to work.

[0027] In some embodiments, during low-temperature start-up mode, after the operation of the vehicle speed control handle and the operation control handle in the electric vehicle's operating handle, their control target values ​​are entered into the vehicle controller. Through analysis and calculation, they are converted into a request signal for the range extender assembly to output power. The range extender assembly will adjust its output power according to the request signal and directly act on the component that issued the power request signal (e.g., the driving motor corresponding to the speed control handle and the working motor of other load devices corresponding to the operation control handle), supplying the component for operation. This current flow process does not pass through the power battery.

[0028] When the vehicle controller 12 detects that the motor assembly is in a state of rapid power decline, the vehicle controller 12 controls the switching device to connect so that the range extender assembly 11 is electrically connected to the power transfer device 14. When the motor assembly suddenly experiences a rapid decrease in power demand, for example, when the change in power demand q within a certain time t is greater than a first threshold, it indicates that the motor assembly is in a state of rapid power decline. For example, the electric vehicle may suddenly encounter an obstacle and be unable to drive normally, causing the drive motor to be in a state of rapid power decline; or the electric vehicle may experience emergency braking, causing the drive motor to generate electricity in reverse when the electric vehicle is driving downhill; or the working device such as the excavator arm may suddenly encounter a hard object and be unable to work further, causing the working motor driving the excavator arm or other working device to be in a state of rapid power decline. At this time, the vehicle controller 12 controls the switching device to connect so that the range extender assembly 11 is electrically connected to the power transfer device 14. In the embodiment shown in the figure, by switching the second electrical switch 22 and / or the first electrical switch 21 to connect, the excess current generated by the range extender assembly can be transferred to the power transfer device 14.

[0029] The low-temperature starting system for range-extended electric vehicles in this embodiment, by setting up a power transfer device and a load device 13 connected in parallel, and the entire parallel connection being electrically connected to the range extender assembly 11, can enable the range extender assembly 11 to provide electrical power to the load device 13 independently in low-temperature starting mode, allowing the electric vehicle to start or operate quickly at low temperatures. When the motor assembly is in a state of rapid power decline, the vehicle controller 12 can control the on / off switching device to connect so that the range extender assembly 11 and the power transfer device 14 are electrically connected, realizing the power transfer of the power transfer device 14, ensuring the safety of the motor assembly, thereby enabling the electric vehicle to start under emergency power supply from the range extender assembly at low temperatures.

[0030] In some embodiments, the power transfer device 14 includes a storage capacitor, a power-consuming resistor, or a storage capacitor and a power-consuming resistor connected in series. The storage capacitor stores the power transferred from the range extender assembly, and the power-consuming resistor consumes the power transferred from the range extender assembly.

[0031] In some embodiments, such as Figure 1 As shown, the power transfer device 14 includes a storage capacitor and a power-consuming resistor connected in series. The switching device includes two switches connected in series with the storage capacitor and the power-consuming resistor, respectively located on the storage capacitor and the power-consuming resistor. This embodiment can simultaneously store and consume the transferred power, achieving a greater power transfer capacity.

[0032] In some embodiments, a battery heating device 16 for heating the power battery 15 is also included. The range extender assembly connects or disconnects its electrical connection with the battery heating device 16 via a fifth electrical switch 25. When the vehicle controller 12 detects that the temperature of the power battery 15 is lower than the discharge temperature and in low-temperature start-up mode, the vehicle controller 12 controls the range extender assembly 11 to connect electrically with the battery heating device 16 to heat the power battery 15. The vehicle controller 12 calculates the maximum heating power of the battery heating device 16 that matches the real-time temperature of the power battery 15. Before the temperature of the power battery 15 reaches the discharge temperature, the electrical power output by the range extender assembly 11 ensures that the heating power of the battery heating device 16 first meets the maximum heating power that matches the real-time temperature of the power battery 15. That is, the electrical power output by the range extender assembly prioritizes the rapid heating and temperature rise of the power battery of the electric vehicle to ensure the highest heating efficiency and allow the temperature of the power battery to recover to above the discharge temperature as soon as possible. Then, the excess electrical power is supplied to the load device. When the power battery returns to above its dischargeable temperature, the low-temperature start-up mode is turned off, and the power battery resumes supplying power to the load device.

[0033] In some embodiments, a low-temperature starting system for an emergency rescue vehicle is included, wherein the motor assembly includes a drive motor for driving the wheels of the emergency rescue vehicle and a work hydraulic pump drive motor for driving the work hydraulic pump of the emergency rescue vehicle.

[0034] In some embodiments, a low-temperature starting method for a range-extended electric vehicle using any of the above-described low-temperature starting systems is also disclosed. The low-temperature starting method includes:

[0035] When the vehicle controller 12 detects that the temperature of the power battery 15 is lower than the discharge temperature, it enters the low temperature start-up mode: it controls the range extender assembly 11 to be electrically connected to the motor assembly to drive the motor assembly to work, and when it detects that the motor assembly is in a state of rapid power decline, the vehicle controller 12 controls the on / off switching device to connect to transfer part of the electrical power of the range extender assembly 11 to the power transfer device 14.

[0036] In some embodiments, the range-extended electric vehicle low-temperature starting system further includes a battery heating device 16 for heating the power battery 15. The low-temperature starting mode includes: controlling the range extender assembly 11 to be electrically connected to the battery heating device 16 to heat the power battery 15; calculating the maximum heating power of the battery heating device 16 to match the real-time temperature of the power battery 15 based on the real-time temperature of the power battery 15; and ensuring that the electrical power output by the range extender assembly 11 before the temperature of the power battery 15 reaches the discharge temperature so that the heating power of the battery heating device 16 first meets the maximum heating power to match the real-time temperature of the power battery 15.

[0037] In some embodiments, the power transfer device 14 includes a storage capacitor and a power-consuming resistor connected in parallel. The switching device includes a first switch and a second switch for controlling whether the storage capacitor and the power-consuming resistor are electrically connected to the range extender assembly 11. In the embodiment shown, the first switch and the second switch are a first electrical switch 21 and a second electrical switch 22, respectively. The low-temperature start-up mode includes: when the motor assembly is detected to be in a state of rapid power decline, firstly controlling the second switch to open to transfer a portion of the power of the range extender assembly 11 to the power-consuming resistor; when the power consumption of the power-consuming resistor is detected to reach the maximum design power, controlling the first switch to open to transfer a portion of the power of the range extender assembly 11 to the storage capacitor.

[0038] In some embodiments, the low-temperature starting system of the range-extended electric vehicle further includes a battery heating device 16 for heating the power battery 15. The low-temperature starting mode includes: controlling the range extender assembly 11 to be electrically connected to the battery heating device 16 to heat the power battery 15; the low-temperature starting method further includes exiting the low-temperature starting mode after detecting that the temperature of the power battery 15 has reached the discharge temperature, disconnecting the power-consuming resistor and the power-storing capacitor from the range extender assembly 11, and when it is detected that the power-storing capacitor has stored power, connecting the power-consuming capacitor to the power-consuming resistor so that the power-consuming resistor consumes the power of the power-storing capacitor.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A range extended electric vehicle low temperature starting system, characterized by, The system features a low-temperature start-up mode and includes: a range extender assembly, a range extender low-temperature start-up device, a vehicle controller, a power battery, a load device, and a power transfer device. The power transfer device includes a power transfer component and an on / off switching component. The load device includes a motor assembly, which includes a travel motor for driving the wheels of the range-extended electric vehicle and / or a work motor for driving the working devices of the range-extended electric vehicle. The power battery is electrically connected to the range extender assembly and the load device. The power transfer device is connected in parallel with the load device, and the entire parallel connection is electrically connected to the range extender assembly. The vehicle controller is signal-connected to the range extender assembly, the range extender low-temperature start-up device, the power battery, the load device, and the power transfer device. When the vehicle controller detects that the temperature of the power battery is below its discharge temperature and in low-temperature start-up mode, the vehicle controller controls the range extender assembly to electrically connect to the motor assembly to drive the motor assembly. Furthermore, when the vehicle controller detects that the motor assembly is in a state of rapid power decline... In the low-temperature start-up mode, the vehicle controller controls the switching device to connect so that the range extender assembly is electrically connected to the power transfer device. The power transfer device includes a storage capacitor and a power-consuming resistor connected in parallel. The switching device includes a first switch and a second switch for controlling whether the storage capacitor and the power-consuming resistor are electrically connected to the range extender assembly. The low-temperature start-up mode includes: when the motor assembly is detected to be in a state of rapid power decline, firstly, the second switch is controlled to connect so that part of the power of the range extender assembly is delivered to the power-consuming resistor. When the power consumption of the power-consuming resistor is detected to reach the maximum design power, the first switch is controlled to connect so that part of the power of the range extender assembly is delivered to the storage capacitor. After the temperature of the power battery is detected to reach the discharge temperature, the low-temperature start-up mode is exited, so that the power-consuming resistor and the storage capacitor are both disconnected from the range extender assembly. And when the storage capacitor is detected to have stored power, the storage capacitor is electrically connected to the power-consuming resistor so that the power-consuming resistor consumes the power of the storage capacitor.

2. The low-temperature starting system for range-extended electric vehicles as described in claim 1, characterized in that, It also includes a battery heating device for heating the power battery. When the vehicle controller detects that the temperature of the power battery is lower than the discharge temperature and in low-temperature start-up mode, the vehicle controller controls the range extender assembly to be electrically connected to the battery heating device to heat the power battery. The vehicle controller calculates the maximum heating power of the battery heating device that matches the real-time temperature of the power battery. Before the temperature of the power battery reaches the discharge temperature, the electrical power output by the range extender assembly ensures that the heating power of the battery heating device first meets the maximum heating power that matches the real-time temperature of the power battery.

3. The low-temperature starting system for range-extended electric vehicles as described in claim 1, characterized in that, The system includes a low-temperature starting system for emergency rescue vehicles, wherein the motor assembly includes a drive motor for driving the wheels of the emergency rescue vehicle and a drive motor for driving the working hydraulic pump of the emergency rescue vehicle.

4. A low-temperature starting method for a range-extended electric vehicle using the low-temperature starting system as described in any one of claims 1 to 3, characterized in that, include: When the vehicle controller detects that the temperature of the power battery is lower than the discharge temperature, it enters a low-temperature start-up mode: controlling the range extender assembly to electrically connect with the motor assembly to drive the motor assembly, and when the vehicle controller detects that the motor assembly is in a state of rapid power decline, the vehicle controller controls the switching device to connect to transfer part of the electrical power of the range extender assembly to the power transfer device; the power transfer device includes a storage capacitor and a power-consuming resistor connected in parallel, and the switching device includes a first switch and a second switch for controlling whether the storage capacitor and the power-consuming resistor are electrically connected to the range extender assembly, respectively. The low-temperature start-up mode includes: when the temperature of the power battery is lower than the discharge temperature, it enters a low-temperature start-up mode. When the motor assembly is in a state of rapid power decline, the second switch is first controlled to connect to transfer part of the electrical power of the range extender assembly to the power-consuming resistor. When the power consumption of the power-consuming resistor is detected to reach the maximum design power, the first switch is controlled to connect to transfer part of the electrical power of the range extender assembly to the storage capacitor. After the temperature of the power battery is detected to reach the discharge temperature, the low-temperature start-up mode is exited, and the power-consuming resistor and the storage capacitor are disconnected from the range extender assembly. When the storage capacitor is detected to have stored charge, the storage capacitor is electrically connected to the power-consuming resistor so that the power-consuming resistor consumes the charge of the storage capacitor.

5. The low-temperature start-up method as described in claim 4, characterized in that, The range-extended electric vehicle low-temperature starting system also includes a battery heating device for heating the power battery. The low-temperature starting mode includes: controlling the range extender assembly to be electrically connected to the battery heating device to heat the power battery; calculating the maximum heating power of the battery heating device that matches the real-time temperature of the power battery; and ensuring that the power power output by the range extender assembly before the power battery temperature reaches the discharge temperature so that the heating power of the battery heating device first meets the maximum heating power that matches the real-time temperature of the power battery.

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