A system and method for improving the range of pure electric vehicles in extremely cold conditions.

Abstract

This invention pertains to a system for improving the range of pure electric vehicles in extremely cold conditions within the field of pure electric vehicle technology. It also relates to a method for improving the range of pure electric vehicles in extremely cold conditions. When the circulating medium temperature is ≥70℃, the PTC (05) stops working, and all heat is provided by the fuel heater (04). This allows the PTC (05) to heat both the HVAC (01) in the passenger compartment and the battery pack (08) simultaneously, and the fuel heater (04) to heat both the HVAC (01) and the battery pack (08) simultaneously. The circulating medium is controlled by an electronic three-way valve (06), with a portion going to the HVAC (01) in the passenger compartment to heat the passenger compartment, and another portion going to the battery pack (08) through a chiller (07). The system and method described in this invention for improving the range of pure electric vehicles in extremely cold conditions ensure both in-vehicle comfort and heating of the power battery under extremely cold conditions, guaranteeing the discharge rate and full discharge of the power battery, thereby improving the driving range of the electric vehicle.

Description

Technical Field

[0001] This invention belongs to the field of pure electric vehicle technology, and more specifically, it relates to a system for improving the range of pure electric vehicles in extremely cold conditions. This invention also relates to a method for improving the range of pure electric vehicles in extremely cold conditions. Background Technology

[0002] With the increasing severity of global energy shortages and environmental pollution, more and more automakers are focusing their R&D efforts on electric vehicles (EVs) due to their economic, environmentally friendly, and low-pollution characteristics. Developing EVs is currently an effective way to achieve energy conservation, emission reduction, and low-carbon travel. However, in northern regions, due to the low temperatures in winter, pure electric vehicles need to heat both the interior and the battery during startup, resulting in excessively fast battery discharge and significantly reduced range. Therefore, there is an urgent need for a method to improve the range of pure electric vehicles in extremely cold regions. Specifically, the current thermal management systems of pure electric vehicles have the following problems: 1. In northern winters, the low temperature results in low battery discharge rates and incomplete discharge. Using PTC (Power Transmission Control) to heat the passenger compartment and battery pack further exacerbates battery consumption, severely impacting range. 2. Even though some thermal management systems use heat pump systems, the performance of existing heat pump air conditioning is mainly effective in areas with ambient temperatures above -10°C. Heat pump air conditioning is almost ineffective in ambient temperatures around -30°C, and the structure and principle of heat pump systems are complex and costly. Therefore, there is room for improvement in existing technologies.

[0003] Existing technology includes a device titled "A Temperature Control Device for a Pure Electric Vehicle Battery System Based on Air Conditioning Technology," with publication number CN204943760U. This technology discloses a temperature control device for a pure electric vehicle battery system based on air conditioning technology, comprising a battery compartment, a condenser, a compressor, an expansion valve, an air conditioning system, an evaporator, a controller, and a heater. The heater is located directly below the battery compartment. The controller is connected to the condenser, compressor, expansion valve, air conditioning system, and evaporator via a solenoid valve. The controller is also connected to a buffer sensor. This invention heats the battery of an electric vehicle in extremely cold winter regions, slowing down its discharge rate in low-temperature environments and increasing the driving range. In high-temperature summer regions, it cools the battery, slowing down the aging rate of its internal units in high-temperature environments and extending its service life. It possesses strong environmental adaptability and provides necessary guarantees for the all-weather temperature environment use of electric vehicles.

[0004] However, this technology does not address the technical issues and solutions of this application. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for improving the range of pure electric vehicles in extreme cold conditions, which is simple in steps, can ensure the comfort of the vehicle interior while heating the power battery under extremely cold conditions, and ensure the discharge rate and full discharge of the power battery under extremely cold conditions.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] This invention relates to a method for improving the range of pure electric vehicles in extremely cold conditions. The method includes a step of simultaneously heating the passenger compartment and the battery pack, and a step of heating the passenger compartment. The step of simultaneously heating the passenger compartment and the battery pack is as follows:

[0008] S1. In extremely cold conditions, when the vehicle is cold-started, the fuel heater is turned on. The fuel heater needs a preheating process of a few minutes before it can burn stably. During the preheating process, the fuel heater provides a small amount of heat, and the PTC provides heat to the HVAC01 and the battery pack.

[0009] S2. When the temperature of the circulating medium is ≥70℃, the PTC stops working. At this time, all the heat is provided by the fuel heater 04. The electronic three-way valve is a proportional valve, which enables the PTC05 to heat the HVAC of the passenger compartment and the battery pack at the same time, and also enables the fuel heater to heat the passenger compartment and the battery pack at the same time.

[0010] S3. The circulating medium, heated by the PTC or fuel heater, is controlled by an electronic three-way valve. Part of it goes to the HVAC in the passenger compartment to heat the passenger compartment and ensure passenger comfort; the other part goes through the chiller to heat the battery pack, ensuring the battery discharge rate and full discharge, and improving the vehicle's driving range.

[0011] The crew cabin heating process is as follows:

[0012] S1. Under normal conditions, considering the technical characteristics of the battery pack, the battery pack does not require heating. In this case, only the HVAC01 in the passenger compartment needs to be heated through PTC05. S2. Under extremely cold conditions, when the vehicle starts, the fuel heater 04 provides relatively little heat during the preheating process before the fuel heater can achieve stable combustion. During this process, the PTC provides heat to the HVAC in the passenger compartment. S3. When the circulating medium temperature is ≥70℃, the PTC stops working. At this time, all the heat is provided by the fuel heater. Since only the HVAC in the passenger compartment needs to be heated under this condition, the flow through the battery pack circuit and the passenger compartment HVAC circuit can be closed by controlling the electronic three-way valve.

[0013] The temperature range of the extreme cold conditions is between 0℃ and -20℃.

[0014] Under normal conditions, the PTC heater operates while the fuel heater stops working; the temperature range under normal conditions is between 20℃ and 0℃.

[0015] The fuel used in the fuel heater is diesel oil.

[0016] Under normal conditions, the low-temperature circulating medium enters the first pipeline of the heat exchanger, and then enters the battery pack through the first pipeline. After cooling the battery pack, the high-temperature circulating medium flowing out enters the second pipeline of the heat exchanger for cooling. The circulating medium cooled through the second pipeline then enters the main pipeline equipped with a fuel heater, PTC, and electronic three-way valve, and then enters the heat exchanger.

[0017] This invention also relates to a system with a simple structure that can simultaneously ensure vehicle interior comfort and heat the power battery under extremely cold conditions, guaranteeing the power battery's discharge rate and full discharge, thereby improving the driving range of electric vehicles in extreme cold conditions. The system for improving the driving range of pure electric vehicles in extreme cold conditions includes an HVAC (Heating, Ventilation and Air Conditioning) system, an electric water pump, a fuel heater, a PTC (Power Transmission Control Unit), an electric three-way valve, a heat exchanger (chiller), a battery pack, a first electric water pump, and a second electric circulation pump. The fuel heater, PTC, and electric three-way valve are located on the main pipeline. The electric three-way valve is simultaneously connected to the first pipeline of the heat exchanger and the HVAC in the passenger compartment. The first pipeline of the fuel heater is connected to the battery pack, which is simultaneously connected to the second pipeline of the heat exchanger. The second pipeline of the heat exchanger is connected to the main pipeline, and the HVAC is connected to the main pipeline.

[0018] The battery pack and heat exchanger are connected by a pipeline, and a second expansion tank and a second electronic circulation pump are installed on the pipeline connecting the battery pack and the heat exchanger.

[0019] The HVAC system and the main pipeline are connected by a pipeline, and a first expansion tank and a first electronic circulation pump are installed on the pipeline connecting the HVAC system and the main pipeline.

[0020] The fuel heater, PTC, electronic three-way valve, first electronic circulation pump, and second electronic circulation pump are respectively connected to the vehicle control components.

[0021] The working principle and beneficial effects of the technical solution adopted in this invention are as follows:

[0022] The system for improving the range of pure electric vehicles in extremely cold conditions described in this invention addresses the problems faced by electric vehicles under special conditions, namely, extreme cold conditions. When the vehicle is cold-starting under normal conditions, the fuel heater is activated. The fuel heater is a component that heats the circulating medium through fuel combustion. It is located on the main pipeline and does not affect the flow of the circulating medium when not in use; it is used to heat the circulating medium when in use. In extremely cold conditions, because the fuel heater requires a preheating process of several minutes before stable combustion, the heat generated and provided by the fuel heater during this preheating process is relatively small. At this time, heat is generated by a PTC (Power Transmission Control Unit). The PTC is a component that heats the circulating medium through electricity and is located on the main pipeline. When not in use, it does not affect the flow of the circulating medium; it is used to heat the circulating medium when in use. The PTC provides heat to the HVAC and battery pack. Once the fuel heater has preheated, it provides sufficient heat. When the circulating medium temperature in the pipeline reaches ≥70°C, the control unit stops the PTC. At this point, all heat is provided by the fuel heater. The electronic three-way valve is a proportional valve. When simultaneous heating of the HVAC and battery pack is required, all pipelines to the HVAC and battery pack are opened, allowing simultaneous heating of the HVAC and battery pack in the passenger compartment while the PTC is heating. Even after the PTC stops working, simultaneous heating of the HVAC and battery pack can be achieved while the fuel heater is heating. The circulating medium, heated by the PTC or fuel heater, is controlled by the electronic three-way valve. Part of it goes to the HVAC in the passenger compartment to heat the passenger compartment, ensuring passenger comfort; the other part goes through the chiller to heat the battery pack, ensuring the battery's discharge rate and full discharge, thus increasing the vehicle's range. This invention utilizes a fuel heater to heat the passenger compartment and battery when driving in extremely cold conditions. Under normal conditions, PTC heating can provide warmth, ensuring comfort inside the vehicle while maintaining the battery's discharge rate and ensuring full discharge, thus improving the vehicle's range. However, in extremely cold conditions, PTC heating is insufficient, requiring a fuel heater. An electronic three-way valve can control the on / off state of the fuel heater and PTC, allowing for simultaneous heating of the passenger compartment and battery pack, or heating of a single circuit, effectively meeting the needs of different operating conditions and making it widely applicable. Attached Figure Description

[0023] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein:

[0024] Figure 1 This is a schematic diagram of the system for improving the range of pure electric vehicles in extremely cold conditions, as described in this invention.

[0025] The labels in the attached diagram are as follows: 01, HVAC; 02, First expansion tank; 03, First electronic circulation pump; 04, Fuel heater; 05, PTC (PTC heater); 06, Electronic three-way valve; 07, Heat exchanger (chiller); 08, Battery pack; 09, Second expansion tank; 10, Second electronic circulation pump. Detailed Implementation

[0026] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of the present invention, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part:

[0027] As attached Figure 1 As shown, this invention provides a method for improving the range of pure electric vehicles in extremely cold conditions. The method includes a step of simultaneously heating the passenger compartment and the battery pack, and a step of heating the passenger compartment. The step of simultaneously heating the passenger compartment and the battery pack is as follows:

[0028] S1. In extremely cold conditions, during cold start operation of the vehicle, the fuel heater 04 is activated. The fuel heater 04 requires a preheating process of several minutes before stable combustion. During this preheating process, the fuel heater 04 provides relatively little heat; the PTC 05 provides heat to the HVAC 01 and battery pack 08. S2. When the circulating medium temperature is ≥70℃, the PTC 05 stops working. At this time, all heat is provided by the fuel heater 04. The electronic three-way valve 06 is a proportional valve, enabling simultaneous heating of the HVAC 01 in the passenger compartment and the battery pack 08 by the PTC 05 and the fuel heater 04. S3. The circulating medium, heated by the PTC 05 or fuel heater 04, is controlled by the electronic three-way valve 06. Part of it goes to the HVAC 01 in the passenger compartment to heat the passenger compartment, ensuring passenger comfort; the other part goes through the chiller 07 to heat the battery pack 08, ensuring the battery's discharge rate and full discharge, thus improving the vehicle's range. The above structure addresses the shortcomings of existing technologies and proposes an improved technical solution. The technical solution of this invention addresses the problems faced by electric vehicles under special conditions, namely, extreme cold conditions. When the vehicle is cold-starting under normal conditions, the fuel heater 04 is activated. The fuel heater 04 is a component that heats the circulating medium through fuel combustion. It is located on the main pipeline and, when not in operation, does not affect the flow of the circulating medium; when in operation, it is used to heat the circulating medium. Under extremely cold conditions, because the fuel heater 04 requires a preheating process of several minutes before stable combustion, the heat generated and provided by the fuel heater 04 during the preheating process is relatively small. At this time, heat is generated by the PTC 05. The PTC 05 is a component that heats the circulating medium through electricity and is located on the main pipeline. When not in operation, it does not affect the flow of the circulating medium; when in operation, it is used to heat the circulating medium. PTC05 provides heat to HVAC01 and battery pack 08. Once the fuel heater 04 has preheated, it can provide sufficient heat. When the temperature of the circulating medium in the pipeline is ≥70℃, the control unit stops PTC05. At this time, all heat is provided by the fuel heater 04. The electronic three-way valve 06 is a proportional valve. When both HVAC01 and battery pack 08 need to be heated simultaneously, all pipelines to HVAC01 and battery pack 08 are opened, allowing PTC05 to heat both HVAC01 and battery pack 08 in the passenger compartment simultaneously. Even after PTC05 stops working, it can still heat both HVAC01 and battery pack 08 simultaneously when the fuel heater 04 is heating. The circulating medium heated by PTC05 or fuel heater 04 is controlled by the electronic three-way valve 06. Part of it goes to HVAC01 in the passenger compartment to heat the passenger compartment, ensuring passenger comfort; the other part goes through the chiller 07 to heat battery pack 08, ensuring the battery's discharge rate and full discharge, thus improving the vehicle's range. The method of the present invention uses a fuel heater to heat the passenger compartment and battery when driving in extremely cold regions.Under normal conditions, the PTC heater can provide heating, ensuring both in-vehicle comfort and maintaining the battery's discharge rate and full discharge, thus improving the vehicle's range. However, in extremely cold conditions, the PTC heater (05) is insufficient, requiring the fuel heater (04) for heating. An electronic three-way valve can control the on / off state of the fuel heater and the PTC heater, allowing for simultaneous heating of the passenger compartment and battery pack, or heating of a single circuit, meeting the needs of different operating conditions and offering wide applicability. The method for improving the range of pure electric vehicles in extremely cold conditions described in this invention is simple in its steps and can simultaneously ensure in-vehicle comfort and heat the power battery under extremely cold conditions, guaranteeing the power battery's discharge rate and full discharge, thereby improving the electric vehicle's range.

[0029] The passenger compartment heating steps are as follows: S1. Under normal conditions, considering the technical characteristics of the battery pack, the battery pack 08 does not need to be heated. At this time, only the HVAC01 in the passenger compartment needs to be heated through HVAC01; S2. Under extremely cold conditions, when the vehicle starts, the fuel heater 04 needs a preheating process before stable combustion. During the preheating process, the fuel heater 04 provides relatively little heat. During this process, the PTC05 provides heat to the HVAC01 in the passenger compartment; S3. When the circulating medium temperature is ≥70℃, the PTC05 stops working. At this time, all the heat is provided by the fuel heater 04. Since only the HVAC01 in the passenger compartment needs to be heated under this condition, the flow through the battery pack 08 circuit and the passenger compartment HVAC01 circuit can be closed by controlling the electronic three-way valve 06. The steps of this invention can satisfy the individual heating needs of the HVAC01 in the passenger compartment under normal conditions, as well as the need for the PTC05 to provide heat to the HVAC01 in the passenger compartment under extremely cold conditions. Simultaneously, it can also satisfy the need for the PTC05 to provide heat to both the HVAC01 in the passenger compartment and the battery pack 08, effectively heating the passenger compartment and ensuring passenger comfort. At the same time, it can heat the battery pack (08), ensuring the battery's discharge rate and full discharge, thus improving the vehicle's driving range. In this way, the overall performance of the electric vehicle is effectively improved.

[0030] The temperature range for the extreme cold conditions is between 0℃ and -20℃. Under normal conditions, PTC05 heats the fuel, while the fuel heater 04 stops working; the temperature range for normal conditions is between 20℃ and 0℃. The fuel used by the fuel heater 04 is diesel oil.

[0031] Under normal conditions, the low-temperature circulating medium enters the first pipe of the heat exchanger 07, then flows through the first pipe into the battery pack 08. After cooling the battery pack 08, the high-temperature circulating medium flowing out enters the second pipe of the heat exchanger 07 for further cooling. The circulating medium cooled by the second pipe then enters the main pipe equipped with the fuel heater 04, PTC 05, and electronic three-way valve 06, and then enters the heat exchanger 07 again. In extremely cold conditions, the high-temperature circulating medium heats the battery pack; when the temperature is high, the low-temperature circulating medium cools the battery pack. This process satisfies the needs of electric vehicles operating in different environments and reduces the impact of temperature. The circulation of the circulating medium is achieved through a first electronic circulation pump and a second electronic circulation pump.

[0032] This invention also relates to a system with a simple structure that can simultaneously ensure vehicle comfort and heat the power battery under extremely cold conditions, guaranteeing the power battery's discharge rate and full discharge under these conditions, thereby improving the driving range of electric vehicles in extreme cold. The system for improving the driving range of pure electric vehicles in extreme cold conditions includes HVAC01, an electronic water pump 03, a fuel heater 04, a PTC 05, an electronic three-way valve 06, a chiller 07, a battery pack 08, a first electronic water pump 10, and a second electronic circulation pump 10. The fuel heater 04, PTC 05, and electronic three-way valve 06 are located on the main pipeline. The electronic three-way valve 06 is simultaneously connected to the first pipeline of the heat exchanger 07 and the HVAC01 in the passenger compartment. The first pipeline of the fuel heater 07 is connected to the battery pack 08, and the battery pack 08 is simultaneously connected to the second pipeline of the heat exchanger 07. The second pipeline of the heat exchanger 07 is connected to the main pipeline, and the HVAC01 is connected to the main pipeline. In extremely cold conditions, the fuel heater 04 generates heat when it is fully operational, which is used to heat the passenger compartment and also to heat the battery pack, thereby increasing the vehicle's driving range.

[0033] The battery pack 08 and heat exchanger 07 are connected by a pipeline, and a second expansion tank 09 and a second electronic circulation pump 10 are installed on the pipeline connecting the battery pack 08 and heat exchanger 07. The HVAC 01 and the main pipeline are connected by a pipeline, and a first expansion tank 02 and a first electronic circulation pump 03 are installed on the pipeline connecting the HVAC 01 and the main pipeline. The fuel heater 04, PTC 05, electronic three-way valve 06, first electronic circulation pump 03, and second electronic circulation pump 10 are respectively connected to the vehicle control components. With the above structure, the control components can reliably control the start and stop of the fuel heater 04, PTC 05, electronic three-way valve 06, first electronic circulation pump 03, and second electronic circulation pump 10, thereby achieving the purpose of different components engaging under different conditions.

[0034] The system for improving the range of pure electric vehicles in extremely cold conditions described in this invention uses a separate control panel for the fuel heater. A safety check should be performed on the fuel heater before operation. The fuel heater is existing technology. Fuel is required for proper ignition in the fuel heater. If a malfunction occurs during heating, an indicator light will flash, indicating the cause of the malfunction. Heating must be stopped immediately, and the specific problem investigated. Use can only resume after the problem is resolved. The fuel used in this invention is diesel oil. Because diesel oil has low volatility and a high flash point, it typically requires an open flame in an environment of 80°C to 120°C to ignite. Therefore, diesel oil is chosen as a safe fuel. Furthermore, different grades of diesel oil are suitable for different ambient temperatures, but higher-grade diesel oil has a wider range of applications than lower-grade diesel oil, making it more versatile.

[0035] The system for improving the range of pure electric vehicles in extremely cold conditions, as described in this invention, adds a fuel heater connected in series in the heating circuit. In extremely cold conditions, it heats the passenger compartment and battery pack. While the PTC (Power Transmission Control) system requires electricity, the fuel heater operates in place of the PTC most of the time, reducing battery power consumption and ensuring in-vehicle comfort while also improving the overall vehicle range. The electronic three-way valve used in this system is a proportional valve, distributing flow according to the heat demand of each circuit. The fuel heater requires different grades of diesel fuel suitable for different environmental conditions.

[0036] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A method for improving the range of pure electric vehicles in extremely cold conditions, characterized in that: The method for improving the range of pure electric vehicles in extremely cold conditions includes a step of simultaneously heating the passenger compartment and the battery pack, and a step of heating the passenger compartment. The step of simultaneously heating the passenger compartment and the battery pack is as follows: S1. In extremely cold conditions, when the vehicle is cold-started, the fuel heater (04) is turned on. The fuel heater (04) needs a few minutes of preheating time before it can burn stably. During the preheating process, the fuel heater (04) provides less heat, and the PTC (05) provides heat to the HVAC (01) and the battery pack (08). S2. When the temperature of the circulating medium is ≥70℃, the PTC (05) stops working. At this time, all the heat is provided by the fuel heater (04). The electronic three-way valve (06) is a proportional valve, which enables the PTC (05) to heat the HVAC (01) and battery pack (08) in the passenger compartment at the same time, and also enables the fuel heater (04) to heat the HVAC (01) and battery pack (08) at the same time. S3. The circulating medium, heated by the PTC (05) or fuel heater (04), is controlled by the electronic three-way valve (06). Part of it goes to the HVAC (01) in the passenger compartment to heat the passenger compartment and ensure the comfort of the passenger compartment; part of it goes to the heat exchanger (07) to heat the battery pack (08) to ensure the battery discharge rate and full discharge, thereby improving the vehicle's range.

2. The method for improving the range of pure electric vehicles in extremely cold conditions according to claim 1, characterized in that: The crew cabin heating process is as follows: S1. Under normal conditions, combined with the technical characteristics of the battery pack, the battery pack (08) does not need to be heated. At this time, the HVAC (01) of the passenger compartment is heated by the PTC (05). S2. Under normal conditions, when the vehicle is started, the fuel heater (04) needs a preheating process time before the fuel heater (04) can stably burn. During the preheating process, the fuel heater (04) provides less heat. During this process, the PTC (05) provides heat to the HVAC (01) of the passenger compartment. S3. When the temperature of the circulating medium is ≥70℃, the PTC (05) stops working. At this time, all the heat is provided by the fuel heater (04). Since only the HVAC (01) of the passenger compartment needs to be heated under this condition, the flow through the battery pack (08) circuit can be closed and the flow through the HVAC (01) circuit of the passenger compartment can be opened by controlling the electronic three-way valve (06).

3. The method for improving the range of pure electric vehicles in extremely cold conditions according to claim 1 or 2, characterized in that: The temperature range of the extreme cold conditions is between 0℃ and -20℃.

4. The method for improving the range of pure electric vehicles in extremely cold conditions according to claim 2, characterized in that: Under normal conditions, the battery pack (08) does not need to be heated; only the passenger compartment needs to be heated; the temperature range under normal conditions is between 20°C and 0°C.

5. The method for improving the range of pure electric vehicles in extremely cold conditions according to claim 1 or 2, characterized in that: The fuel used in the fuel heater (04) is diesel.

6. The method for improving the range of pure electric vehicles in extremely cold conditions according to claim 2, characterized in that: Under normal conditions, the low-temperature circulating medium enters the first pipeline of the heat exchanger (07), and the first circulating medium through the first pipeline enters the battery pack (08). The high-temperature circulating medium flowing out after cooling the battery pack (08) enters the second pipeline of the heat exchanger (07) for cooling. The circulating medium cooled through the second pipeline enters the main pipeline equipped with the fuel heater (04), PTC (05) and electronic three-way valve (06), and then enters the heat exchanger (07).

7. The system for improving the range of pure electric vehicles in extremely cold conditions according to claim 1, characterized in that: Includes HVAC (01), first electronic circulation pump (03), fuel heater (04), PTC (05), electronic three-way valve (06), heat exchanger (07), battery pack (08), and second electronic circulation pump (10). The fuel heater (04), PTC (05), and electronic three-way valve (06) are installed on the main pipeline. The electronic three-way valve (06) is connected to the first pipeline of the heat exchanger (07) and the HVAC (01) in the passenger compartment. The first pipeline of the fuel heater (04) is connected to the battery pack (08). The battery pack (08) is connected to the second pipeline of the heat exchanger (07). The second pipeline of the heat exchanger (07) is connected to the main pipeline. The HVAC (01) is connected to the main pipeline.

8. The system for improving the range of pure electric vehicles in extremely cold conditions according to claim 7, characterized in that: The battery pack (08) and the heat exchanger (07) are connected by a pipeline, and a second expansion tank (09) and a second electronic circulation pump (10) are installed on the pipeline connecting the battery pack (08) and the heat exchanger (07).

9. The system for improving the range of pure electric vehicles in extremely cold conditions according to claim 7 or 8, characterized in that: The HVAC (01) and the main pipeline are connected by a pipeline, and a first expansion tank (02) and a first electronic circulation pump (03) are installed on the pipeline connecting the HVAC (01) and the main pipeline.

10. The system for improving the range of pure electric vehicles in extremely cold conditions according to claim 9, characterized in that: The fuel heater (04), PTC (05), electronic three-way valve (06), first electronic circulation pump (03), and second electronic circulation pump (10) are respectively connected to the vehicle control components.

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