Low-temperature starting system and low-temperature starting method for extended-range electric vehicle

Abstract

The invention discloses a range-extended electric vehicle low-temperature starting system which has a low-temperature starting mode, a motor assembly comprises a running motor used for driving wheels of a range-extended vehicle to run and / or a working motor used for driving a working device of the range-extended vehicle to work, and a power battery is electrically connected with a range extender assembly and a load device. The electric quantity transfer device and the load device are connected in parallel, and the whole body after parallel connection is electrically connected with the range extender assembly; the whole vehicle controller is in signal connection with the range extender assembly, the range extender low-temperature starting device, the power battery, the load device and the electric quantity transfer device; when the vehicle control unit detects that the temperature of the power battery is lower than the dischargeable temperature and the vehicle control unit is in a low-temperature starting mode, the vehicle control unit controls the range extender assembly to be electrically connected with the motor assembly so as to drive the motor assembly to work, and when the vehicle control unit detects that the power of the motor assembly is in a rapid power reduction state, the vehicle control unit controls the range extender assembly to be electrically connected with the motor assembly. The vehicle control unit controls the on-off switching device to be connected so that the range extender assembly can be electrically connected with the electric quantity transfer device.

Description

Technical Field

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

[0002] In the field of vehicles, extended-range electric vehicles are a type of new energy electric vehicles. By adding a range extender assembly to a pure electric vehicle, the range extender assembly provides a certain amount of electrical energy to maintain the vehicle's continuous driving, thereby extending the vehicle's driving range. The range extender assembly of the prior art mostly adopts the form of a combination of an internal combustion engine and a generator. When in use, the internal combustion engine drives the generator to generate electricity to charge the power battery, or the internal combustion engine drives the generator to generate electricity to supply power to the vehicle's travel motor and other load devices. The range extender assembly cannot supply power to the vehicle load alone. If it is supplied alone, the power generated by the range extender assembly will be greatly different from the load demand, which will cause damage to the travel motor and other load devices, and even cause safety problems. Extended-range electric vehicles may be used in some low-temperature environments. At this time, the temperature of the power battery of the electric vehicle may drop below the dischargeable temperature allowed for discharge, and the power battery is not allowed to supply power. At this time, it is necessary to start the range extender assembly first to heat the power battery, and then wait until the power battery temperature rises above the dischargeable temperature before supplying power. However, for some vehicles with fast operation requirements, such as emergency rescue vehicles, it is difficult to meet the fast work requirements. Summary of the invention

[0003] The object of the present invention is to provide a low-temperature starting system for an extended-range electric vehicle that can start quickly in a low-temperature environment.

[0004] The present invention discloses a low-temperature starting system for an extended-range electric vehicle, which has a low-temperature starting mode and includes: a range extender assembly, a range extender low-temperature starting device, a vehicle controller, a power battery, a load device and an electric quantity transfer device, wherein the electric quantity transfer device includes an electric quantity transfer component and an on-off switching component, the load device includes a motor assembly, the motor assembly includes a travel motor for driving the wheels of the extended-range vehicle to travel and / or a working motor for driving the working device of the extended-range vehicle to work, the power battery is electrically connected to the range extender assembly and the load device, the electric quantity transfer device is connected in parallel with the load device, and after being connected in parallel, The whole is electrically connected to the range extender assembly, and 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 dischargeable temperature and is in the 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, and 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 to electrically connect the range extender assembly to the power transfer device.

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

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

[0007] In some embodiments, a battery heating device for heating the power battery is further included. When the vehicle controller detects that the temperature of the power battery is lower than the dischargeable temperature and in the low-temperature starting 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 according to the real-time temperature of the power battery, and before the temperature of the power battery reaches the dischargeable temperature, the electric power output by the range extender assembly makes the heating power of the battery heating device first meet the maximum heating power that matches the real-time temperature of the power battery.

[0008] In some embodiments, including a low-temperature starting system for an emergency rescue vehicle, the motor assembly includes a travel 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 the present invention discloses a low-temperature starting method using any of the above-mentioned low-temperature starting systems for extended-range electric vehicles, comprising:

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

[0011] In some embodiments, the extended-range electric vehicle low-temperature starting system also includes a battery heating device for heating the power battery, and 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 according to the real-time temperature of the power battery, and before the temperature of the power battery reaches the dischargeable temperature, the electric power output by the range extender assembly makes the heating power of the battery heating device first meet 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 consumption resistor connected in parallel, the on-off switching device includes a first switch and a second switch respectively used to control whether the storage capacitor and the power consumption resistor are electrically connected to the range extender assembly, and the low-temperature starting mode includes: when it is detected that the motor assembly is in a state of rapid power decline, first controlling the second switch to be connected to transmit part of the electric power of the range extender assembly to the power consumption resistor; when it is detected that the power consumption of the power consumption resistor reaches the maximum design power, controlling the first switch to be connected to transmit part of the electric power of the range extender assembly to the storage capacitor.

[0013] In some embodiments, the low-temperature starting system of the extended-range electric vehicle also includes a battery heating device for heating the power battery, and 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 also includes exiting the low-temperature starting mode after detecting that the temperature of the power battery reaches a dischargeable temperature, so that the power consumption resistor and the power storage capacitor are both electrically disconnected from the range extender assembly, and when it is detected that the power storage capacitor stores power, the power storage capacitor is electrically connected to the power consumption resistor so that the power consumption resistor consumes the power of the power storage capacitor.

[0014] Based on the low-temperature starting system for an extended-range electric vehicle provided by the present invention, by arranging a power transfer device and a load device to be connected in parallel and the whole after parallel connection is electrically connected to the range extender assembly, the range extender assembly can provide electric power to the load device alone in the low-temperature starting mode, so that the electric vehicle can achieve rapid starting 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 be connected so that the range extender assembly is electrically connected to the power transfer device, thereby realizing power transfer of the power transfer device and ensuring the safety of the motor assembly.

[0015] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 Schematic diagram of the structure of a low-temperature starting system for an electric vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0020] In the description of the present invention, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0023] The low-temperature starting system for the extended-range electric vehicle of this embodiment has a low-temperature starting mode, and the low-temperature starting system for the extended-range 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 the low-temperature starting mode, the range extender assembly is started by the range extender low-temperature starting device. The range extender low-temperature starting device includes a low-temperature and low-voltage battery, a coolant heating device, an intake heating device, and an engine starting motor. The range extender low-temperature starting device is a conventional mature product structure in the prior art, with high reliability and fast starting, and can meet the rapid response requirements of electric vehicles such as emergency rescue equipment.

[0025] The power transfer device includes a power transfer device 14 and an on-off switching device, the load device 13 includes a motor assembly, the motor assembly includes a travel motor for driving the wheels of the extended-range vehicle and / or a working motor for driving the working device of the extended-range vehicle, the power battery 15 is electrically connected to the range extender assembly 11 and the load device 13, the power transfer device is connected in parallel with the load device 13 and the whole after 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 device 14; signal connection refers to the transmission of control signals or data signals by means of wire connection or wireless connection, such as Figure 1 The dashed lines shown indicate the signal connection between the vehicle controller and other devices. Electrical connection means the ability to transmit current. Figure 1 As shown, the two ends of the power transfer device are electrically connected to the two ends of the load device 13 respectively to achieve a parallel connection between the two. The on-off switching device includes some electrical switches, which can cut off the electrical connection between the power transfer device 14 and the range extender assembly or open the electrical connection between the power transfer device 14 and the range extender assembly. In the embodiment shown in the figure, it includes a first electrical switch 21 and a second electrical switch 22. The power battery is discharged at a normal temperature to drive the electric vehicle to travel and work. The power battery includes a high-voltage battery pack for charging and discharging. The power battery of the prior art is not allowed to be charged or discharged at low temperatures, such as below minus ten degrees Celsius.

[0026] When the vehicle controller 12 detects that the temperature of the power battery 15 is lower than the dischargeable temperature (for example, -15°C), the vehicle controller 12 switches to the low-temperature starting mode. At this time, in the low-temperature starting mode, the vehicle controller 12 turns off the third electrical switch 23 between the power battery 15 and the load device, and turns off the fourth electrical switch 24 between the range extender assembly to turn off 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 to drive the motor assembly to work.

[0027] In some embodiments, in the low-temperature starting mode, after the speed control handle for controlling the vehicle speed and the operation control handle for controlling the operation in the operating handle of the electric vehicle are operated, their control target values ​​enter the vehicle controller, which is converted into a request signal for the range extender assembly to output power through analysis and calculation. The range extender assembly will adjust the output power according to the request signal, and directly act on the component that sends the power request signal (such as the driving motor corresponding to the speed control handle and the working motor of other load devices corresponding to the operation control handle) to supply the component for operation. The 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 on-off switching device to be connected so that the range extender assembly 11 is electrically connected to the power transfer device 14. When the motor assembly suddenly has a rapid decline in demand for electric power, for example, when the change value Δq of the electric power demand q within a certain time t is greater than the first threshold, it indicates that the motor assembly is in a state of rapid power decline, for example, the electric vehicle suddenly encounters an obstacle and cannot drive normally, causing the driving motor to be in a state of rapid power decline, or the electric vehicle is in a state of rapid power decline due to emergency braking, or the electric vehicle drives downhill and causes the driving motor to generate reverse power input, or the working device such as the excavation working arm suddenly encounters a hard object and cannot work further, causing the working motor driving the excavation working arm and other working devices to be in a state of rapid power decline. At this time, the vehicle controller 12 controls the on-off switching device to be connected so that the range extender assembly 11 is electrically connected to the power transfer device 14. In the embodiment shown in the figure, the second electric switch 22 and / or the first electric switch 21 are switched to be connected, so that the excess current emitted by the range extender assembly can be transferred to the power transfer device 14.

[0029] The low-temperature starting system for the range-extended electric vehicle of this embodiment, by arranging a power transfer device connected in parallel with the load device 13 and electrically connecting the whole in parallel with the range extender assembly 11, can realize that the range extender assembly 11 provides electric power to the load device 13 alone in the low-temperature starting mode, so that the electric vehicle can realize rapid starting or operation 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 be connected so that the range extender assembly 11 is electrically connected with the power transfer device 14, realize the power transfer of the power transfer device 14, ensure the safety of the motor assembly, and thus realize that the electric vehicle can be started by emergency power supply of the range extender assembly at low temperatures.

[0030] In some embodiments, the power transfer device 14 includes a storage capacitor, a consumption resistor, or a storage capacitor and a consumption resistor connected in series. The storage capacitor is used to store the power transferred from the range extender assembly, and the consumption resistor is used to consume the power transferred from the range extender assembly.

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

[0032] In some embodiments, a battery heating device 16 for heating the power battery 15 is further included, and the range extender assembly realizes the connection or closing of the electrical connection with the battery heating device 16 through the fifth electric switch 25. When the vehicle controller 12 detects that the temperature of the power battery 15 is lower than the dischargeable temperature and in the low temperature starting mode, the vehicle controller 12 controls the range extender assembly 11 to be electrically connected to 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 matching the real-time temperature of the power battery 15 according to the real-time temperature of the power battery 15, and before the temperature of the power battery 15 reaches the dischargeable temperature, the electric power output by the range extender assembly 11 makes the heating power of the battery heating device 16 first meet the maximum heating power matching the real-time temperature of the power battery 15, that is, the electric power output by the range extender assembly first ensures that the power battery of the electric vehicle is quickly heated and heated, ensures the highest heating efficiency, and restores the temperature of the power battery to above the dischargeable temperature as soon as possible, and then the excess electric power is supplied to the work of the load device. When the power battery recovers to above the dischargeable temperature, the low temperature starting mode is turned off and the power battery resumes supplying power to the load device.

[0033] In some embodiments, including a low-temperature starting system for an emergency rescue vehicle, the motor assembly includes a travel 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.

[0034] In some embodiments, a low-temperature starting method using any of the above-mentioned extended-range electric vehicle low-temperature starting systems is also disclosed, the low-temperature starting method comprising:

[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 starting mode: the range extender assembly 11 is controlled to be electrically connected to the motor assembly to drive the motor assembly to work, and when it is detected that the motor assembly is in a state of rapid power decline, the vehicle controller 12 controls the on-off switching device to be connected to transmit part of the electric power of the range extender assembly 11 to the power transfer device 14.

[0036] In some embodiments, the low-temperature starting system of the extended-range electric vehicle also 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 that matches the real-time temperature of the power battery 15 according to the real-time temperature of the power battery 15, and before the temperature of the power battery 15 reaches the dischargeable temperature, the electric power output by the range extender assembly 11 makes the heating power of the battery heating device 16 first meet the maximum heating power that matches the real-time temperature of the power battery 15.

[0037] In some embodiments, the power transfer device 14 includes a power storage capacitor and a power consumption resistor connected in parallel, and the on-off switching device includes a first switch and a second switch for controlling whether the power storage capacitor and the power consumption resistor are electrically connected to the range extender assembly 11. In the embodiment shown in the figure, the first switch and the second switch are respectively a first electrical switch 21 and a second electrical switch 22. The low temperature starting mode includes: when it is detected that the motor assembly is in a state of rapid power decline, firstly controlling the second switch to be connected to transfer part of the electric power of the range extender assembly 11 to the power consumption resistor, and when it is detected that the power consumption of the power consumption resistor reaches the maximum design power, controlling the first switch to be connected to transfer part of the electric power of the range extender assembly 11 to the power storage capacitor.

[0038] In some embodiments, the low-temperature starting system of the extended-range electric vehicle also includes a battery heating device 16 for heating the power battery 15, and 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 also includes exiting the low-temperature starting mode after detecting that the temperature of the power battery 15 reaches the dischargeable temperature, so that the power consumption resistor and the power storage capacitor are electrically disconnected from the range extender assembly 11, and when it is detected that the power storage capacitor stores electricity, the power storage capacitor is electrically connected to the power consumption resistor so that the power consumption resistor consumes the power of the power storage capacitor.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A low-temperature starting system for an extended-range electric vehicle, characterized in that: A low-temperature starting mode is provided, comprising: a range extender assembly, a range extender low-temperature starting device, a vehicle controller, a power battery, a load device and an electric quantity transfer device, wherein the electric quantity transfer device comprises an electric quantity transfer component and an on-off switching component, the load device comprises a motor assembly, the motor assembly comprises a travel motor for driving the wheels of the range extender vehicle to travel and / or a working motor for driving the working device of the range extender vehicle to work, the power battery is electrically connected to the range extender assembly and the load device, the electric quantity transfer device is connected in parallel to the load device, and the whole after being connected in parallel is electrically connected to the range extender assembly The vehicle controller is connected with the range extender assembly, the range extender low-temperature starting device, the power battery, the load device and the power transfer device by signal connection; when the vehicle controller detects that the temperature of the power battery is lower than the dischargeable temperature and in the 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, and 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 to electrically connect the range extender assembly to the power transfer device.

2. The low-temperature starting system for an extended-range electric vehicle according to claim 1, characterized in that: The power transfer device includes a power storage capacitor, a power consumption resistor, or a power storage capacitor and a power consumption resistor connected in series.

3. The low-temperature starting system for an extended-range electric vehicle according to claim 2, characterized in that: The power transfer device includes a power storage capacitor and a power consumption resistor connected in series, and the on-off switching device includes two switches connected in series with the power storage capacitor and the power consumption resistor and located respectively in the power storage capacitor and the power consumption resistor connected in series.

4. The low-temperature starting system for an extended-range electric vehicle according to 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 dischargeable temperature and in the low-temperature starting 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 according to the real-time temperature of the power battery, and before the temperature of the power battery reaches the dischargeable temperature, the electric power output by the range extender assembly makes the heating power of the battery heating device first meet the maximum heating power that matches the real-time temperature of the power battery.

5. The low-temperature starting system for an extended-range electric vehicle according to claim 1, characterized in that: The invention comprises a low temperature starting system of an emergency rescue vehicle, wherein the motor assembly comprises a travel drive motor for driving the wheels of the emergency rescue vehicle to move and a working hydraulic pump drive motor for driving the working hydraulic pump of the emergency rescue vehicle to work.

6. A low-temperature starting method using the low-temperature starting system for an extended-range electric vehicle as claimed in any one of claims 1 to 4, characterized in that: include: When the vehicle controller detects that the temperature of the power battery is lower than the dischargeable temperature, it enters the low-temperature starting mode: the range extender assembly is controlled to be electrically connected to the motor assembly to drive the motor assembly to work, and when it is detected that the motor assembly is in a state of rapid power decline, the vehicle controller controls the on-off switching device to be connected to transmit part of the electric power of the range extender assembly to the power transfer device.

7. The low temperature starting method according to claim 6, characterized in that: The low-temperature starting system of the extended-range electric vehicle 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 according to the real-time temperature of the power battery, and before the temperature of the power battery reaches a dischargeable temperature, the electric power output by the range extender assembly makes the heating power of the battery heating device first meet the maximum heating power that matches the real-time temperature of the power battery.

8. The low temperature starting method according to claim 6, characterized in that: The power transfer device includes a storage capacitor and a power consumption resistor connected in parallel with each other, the on-off switching device includes a first switch and a second switch respectively used to control whether the storage capacitor and the power consumption resistor are electrically connected to the range extender assembly, and the low-temperature starting mode includes: when it is detected that the motor assembly is in a state of rapid power decline, first controlling the second switch to be connected to transmit part of the electric power of the range extender assembly to the power consumption resistor, and when it is detected that the power consumption of the power consumption resistor reaches the maximum design power, controlling the first switch to be connected to transmit part of the electric power of the range extender assembly to the storage capacitor.

9. The low temperature starting method according to claim 8, characterized in that: The low-temperature starting system of the extended-range electric vehicle 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; the low-temperature starting method also includes exiting the low-temperature starting mode after detecting that the temperature of the power battery reaches a dischargeable temperature, disconnecting the power consumption resistor and the power storage capacitor from the range extender assembly, and when detecting that the power storage capacitor stores power, electrically connecting the power storage capacitor to the power consumption resistor so that the power consumption resistor consumes the power of the power storage capacitor.

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