Lower body structure and hybrid vehicle

Abstract

The utility model provides a kind of lower body structure and including its hybrid car, lower body structure includes exhaust pipe threshold integrated structure and heat sink, exhaust pipe in exhaust pipe threshold integrated structure is worn in threshold, heat exchange pipe is set in the outer periphery of exhaust pipe and has communicating port;Heat sink includes multiple heat exchanger and the flow path switching component between multiple heat exchanger and communicating port is set, flow path switching component can selectively communicate one heat exchanger with communicating port, to make heat exchange pipe and corresponding heat exchanger communicate and form cooling circuit.Exhaust pipe is integrated with threshold, save the space occupied by exhaust pipe in lower body, save the space for the arrangement of power battery, utilize cooling medium in heat exchange pipe and exhaust pipe heat exchange, avoid high temperature exhaust pipe harm threshold and peripheral parts;Cooling medium after exhaust pipe heat exchange can select and heat exchange in multiple heat exchanger, to dissipate heat to outside, or utilize the heat of exhaust pipe.

Description

Technical Field

[0001] This utility model belongs to the field of automotive engine technology, and specifically relates to a lower body structure of a hybrid vehicle and a hybrid vehicle having the lower body structure. Background Technology

[0002] Hybrid electric vehicles (hereinafter referred to as hybrid vehicles) are an important branch of new energy vehicles. Hybrid vehicles fully utilize the characteristics of both electric and petroleum energy. For short-distance travel or when the onboard battery is sufficient, they can be used as electric vehicles, offering the advantages of zero pollution and zero emissions. However, for long-distance travel or when the onboard battery is low and charging is inconvenient, they take full advantage of the convenience and speed of recharging from fossil fuels. They can use an internal combustion engine (range extender) to generate electricity, with the electric motor driving the wheels, or the internal combustion engine directly driving the wheels. Because of the buffer provided by the onboard battery, the internal combustion engine can operate in its optimal efficiency range, satisfying the wheel drive requirements while maximizing engine efficiency. Excess or insufficient energy is stored or extracted in the onboard battery. Compared to traditional gasoline vehicles, hybrid vehicles have a significantly lower fuel consumption rate.

[0003] In current hybrid vehicles, some of the heat from the internal combustion engine is dissipated through the exhaust pipe, which is suspended under the vehicle body. However, the location of the exhaust pipe within the lower body and the surrounding heat dissipation area significantly reduce the design space for the battery pack, which is also located under the vehicle body, thus limiting the battery's capacity. A smaller battery capacity means a higher probability of the vehicle needing to use fossil fuels for refueling, increasing fossil fuel consumption. Furthermore, if the exhaust pipe directly dissipates heat into the atmosphere through natural air convection, it wastes energy. Integrating a heat exchange device in the lower body to exchange heat with the exhaust pipe and utilize thermal energy would further reduce space requirements, compressing the design space for the battery pack. Utility Model Content

[0004] The purpose of this invention is to solve the problem that the exhaust pipe arrangement of existing hybrid vehicles occupies the space of the power battery, thereby limiting the battery's charge capacity, and that if the exhaust pipe is heat-exchanged to utilize heat energy, it will further occupy space. This invention provides a lower body structure.

[0005] To solve the above-mentioned technical problems, the present invention discloses a lower vehicle body structure, including: an exhaust pipe sill integrated structure, the exhaust pipe sill integrated structure including a sill, an exhaust pipe and a heat exchange pipe; the sill is provided with a cavity extending along its length and penetrating both ends of the sill; the exhaust pipe passes through the cavity; the heat exchange pipe passes through the cavity and is sleeved on the outer periphery of the exhaust pipe to achieve heat transfer; the inner cavity of the heat exchange pipe is used for the flow of a first cooling medium, and the heat exchange pipe has a communication port communicating with the inner cavity; a heat dissipation device, the heat dissipation device including multiple heat exchangers and a flow path switching component, the flow path switching component being disposed between the multiple heat exchangers and the communication port, and selectively connecting one of the multiple heat exchangers to the communication port of the heat exchange pipe, so that the heat exchange pipe and the corresponding heat exchanger are connected to form a cooling circuit.

[0006] The above solution integrates part of the exhaust pipe with the door sill to form an integrated exhaust pipe and door sill structure, saving space occupied by the exhaust pipe in the lower body and freeing up space for the power battery. A heat exchange pipe is installed around the outer periphery of the exhaust pipe in the integrated exhaust pipe and door sill structure. The cooling medium flowing through this pipe exchanges heat with the exhaust pipe, carrying away heat and preventing the high temperature of the exhaust pipe from damaging the door sill and surrounding parts. Multiple heat exchangers are also installed, with flow path switching components at the connection points of the cooling medium on the heat exchange pipes. These components control the connection point to a heat exchanger to form a cooling loop, allowing the cooling medium, after exchanging heat with the exhaust pipe, to exchange heat with different heat exchangers as needed. When the vehicle's thermal management system has sufficient heat, the cooling medium can exchange heat with the outside air through a heat exchanger, dissipating the heat to the outside. When the vehicle's thermal management system has insufficient heat, the cooling medium can exchange heat with other thermal management systems in the vehicle, such as the air conditioning system and battery cooling system, to utilize the heat from the exhaust pipe and save energy. Furthermore, the heat exchange pipe used for heat exchange of the exhaust pipe is also installed in the door sill, without occupying other space in the lower part of the vehicle body, thus utilizing the heat from the exhaust pipe without taking up additional space.

[0007] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a lower vehicle body structure, including a plurality of heat exchangers, including a first heat exchanger and a second heat exchanger. A flow path switching component can selectively connect the first heat exchanger or the second heat exchanger to the connection port of the heat exchange tube, so that the heat exchange tube is connected to the first heat exchanger to form a first cooling circuit, or the heat exchange tube is connected to the second heat exchanger to form a second cooling circuit. The first heat exchanger has a first flow channel and a second flow channel that are independently arranged. The interior of the first flow channel is used to connect with the heat exchange tube to form a first cooling circuit for the flow of a first cooling medium. The interior of the second flow channel is used to allow the flow of a second cooling medium, so that the first cooling medium and the second cooling medium exchange heat. The second heat exchanger has a heat exchange flow channel. The interior of the heat exchange flow channel is used to connect with the heat exchange tube to form a second cooling circuit for the flow of the first cooling medium, so that the first cooling medium exchanges heat with the air outside the heat exchange flow channel.

[0008] By adopting the above technical solution, when the vehicle's thermal management system lacks sufficient heat, the first cooling medium can exchange heat with the vehicle's thermal management system through the first heat exchanger to utilize the heat from the exhaust pipe and save energy. When the vehicle's thermal management system regenerates heat, it exchanges heat with the air outside the vehicle body through the second heat exchanger, directly dissipating the heat to the outside.

[0009] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a lower body structure, wherein the first cooling medium is a cooling medium that can switch between gaseous and liquid states; the connecting port, the flow path switching component, and each heat exchanger are arranged sequentially from low to high along the height direction of the lower body structure.

[0010] Using the above technical solution, the first cooling medium becomes gaseous after heat exchange and rises into the heat exchanger in the conductive cooling circuit for heat exchange. After heat exchange, it becomes liquid and can flow downward back to the heat exchange tube. There is no need to set up an additional pump or other auxiliary device to facilitate the flow of the first cooling medium, saving space and cost.

[0011] According to another specific embodiment of this utility model, an embodiment of the present utility model discloses a lower vehicle body structure. A flow path switching component includes a heat exchange interface and multiple heat dissipation interfaces corresponding to multiple heat exchangers. The multiple heat dissipation interfaces include a first heat dissipation interface and a second heat dissipation interface. The heat exchange interface is connected to and communicates with the communication port of a heat exchange pipe. The first heat dissipation interface is connected to a first heat exchanger through a first guide pipe and communicates with a first flow channel. The second heat dissipation interface is connected to a second heat exchanger through a second guide pipe and communicates with the heat exchange flow channel. The flow path switching component can selectively connect the flow path between the first or second heat dissipation interface and the heat exchange interface. When the flow path between the first heat dissipation interface and the heat exchange interface of the flow path switching component is connected, the heat exchange pipe, the communication port, the heat exchange interface of the flow path switching component, the first heat dissipation interface, the first guide pipe, and the first flow channel of the first heat exchanger are connected to form a first cooling circuit. When the flow path between the second heat dissipation interface and the heat exchange interface of the flow path switching component is connected, the heat exchange pipe, the communication port, the heat exchange interface of the flow path switching component, the second heat dissipation interface, the second guide pipe, and the heat exchange flow channel of the second heat exchanger are connected to form a second cooling circuit.

[0012] Using the above technical solution, the heat exchange tube, a guide tube, and the heat exchanger corresponding to the guide tube form a closed cooling circuit. The cooling circuit has fewer devices and a simpler structure.

[0013] According to another specific embodiment of the present invention, in a lower vehicle body structure disclosed in this embodiment, the extension directions of the first guide pipe and the second guide pipe are both at an angle greater than or equal to 5° with the first plane, and the first plane is perpendicular to the height direction of the lower vehicle body structure; the first guide pipe and the second guide pipe are made of heat insulation material.

[0014] By adopting the above technical solution, the first guide pipe and the second guide pipe are set at this angle to ensure the speed of the return flow of the first cooling medium; the guide pipe is made of heat insulation material to prevent the temperature dissipation of the gaseous first cooling medium therein from having an adverse effect on the body parts.

[0015] The present invention also discloses a hybrid vehicle, including the lower body structure provided by the present invention. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of the lower vehicle body structure provided by this utility model;

[0017] Figure 2 yes Figure 1 A partial enlarged view of the front end of the integrated structure for the central exhaust pipe sill;

[0018] Figure 3 This is a schematic diagram of the structure of the first heat exchanger in the lower body structure provided by this utility model;

[0019] Figure 4 This is a schematic diagram of the second heat exchanger in the lower body structure provided by this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Exhaust pipe sill integrated structure,

[0022] 10. Threshold, 101. Threshold beam, 102. Inner tube, 103. Support frame,

[0023] 11. Exhaust pipe,

[0024] 12. Heat exchanger tubes

[0025] 13. Connecting port

[0026] 14. Annular block,

[0027] 2. Heat dissipation device

[0028] 20. First heat exchanger; 201. First flow channel; 202. Second flow channel; 203. First collector; 204. Water tank; 2041. Liquid inlet; 2042. Liquid outlet; 205. First heat dissipation tube; 206. First fin.

[0029] 21. Second heat exchanger; 211. Heat exchange channel; 212. Second collector; 213. Second heat dissipation tube; 214. Second fin.

[0030] 22. Flow path switching component; 221. Heat exchange interface; 222. First heat dissipation interface; 223. Second heat dissipation interface.

[0031] 23. First diversion tube,

[0032] 24. Second guide tube,

[0033] 3. Power battery,

[0034] 4. Right threshold

[0035] 5. Front section of the exhaust pipe,

[0036] 51. Catalyst, 52. Flexible tube, 53. Central muffler,

[0037] 6. Rear section of the exhaust pipe,

[0038] 61. Rear muffler. Detailed Implementation

[0039] Hybrid electric vehicles (HEVs) consist of a battery and an internal combustion engine. The battery is located in the lower part of the vehicle's body, which also needs to house an exhaust pipe to expel exhaust gases from the internal combustion engine. Furthermore, some of the heat generated by the internal combustion engine during startup needs to be dissipated through the exhaust pipe. Therefore, a heat dissipation area needs to be provided around the exhaust pipe, compressing the design space for the battery and thus limiting its capacity. A smaller battery capacity in a hybrid vehicle means a higher probability of needing to use fossil fuels for refueling, thereby increasing fossil fuel consumption.

[0040] Furthermore, when a hybrid vehicle operates in hybrid mode due to a lack of onboard electric power, the internal combustion engine starts. The internal combustion engine converts a portion of the fossil fuel consumed into mechanical or electrical energy, while the majority is dissipated through mechanical friction or heat. In summer, because the cabin, battery, and electric drive systems require cooling rather than heating, this heat is dissipated into the atmosphere. However, in winter, the cabin, battery, and electric drive systems require heat to maintain a comfortable temperature, and the heat generated from these fossil fuels can be utilized to meet their heating needs.

[0041] Traditional internal combustion engine heat utilization involves designing a cooling circuit, including heat exchange pipes, within the engine itself. Heat is exchanged between the engine and the passenger compartment via a heater core, or an integrated thermal management system is used to meet the heat demands of the battery and electric drive system. However, when the passenger compartment, battery, and electric drive system require significant heat, the cooling circuit becomes insufficient, necessitating the simultaneous activation of a PTC (Power Transmission Control) system for electric heating, which consumes electrical energy. Existing technologies also attempt to save heat by installing a heat exchange device in the lower part of the vehicle body to exchange heat with the exhaust pipe; however, this further occupies space and reduces the design space for the power battery.

[0042] To address the aforementioned issues, this invention provides a lower vehicle body structure that integrates part of the exhaust pipe with the door sill to form an exhaust pipe-door sill integrated structure. This saves space occupied by the exhaust pipe in the lower vehicle body, thus freeing up space for the power battery placement. A heat exchange pipe is installed around the outer periphery of the exhaust pipe within the exhaust pipe integrated structure. The cooling medium flowing through this pipe exchanges heat with the exhaust pipe, carrying away heat and preventing the high temperature of the exhaust pipe from damaging the door sill and surrounding components. Multiple heat exchangers are also provided. A flow path switching component is installed at the connection port on the heat exchange pipe for cooling medium flow. This component controls the connection port to a heat exchanger to form a cooling circuit, allowing the cooling medium, after exchanging heat with the exhaust pipe, to exchange heat with different heat exchangers as needed. When the vehicle's thermal management system has sufficient heat, the cooling medium can exchange heat with the outside air through a heat exchanger, dissipating the heat to the outside. When the vehicle's thermal management system has insufficient heat, the cooling medium can exchange heat with other thermal management systems in the vehicle, such as the air conditioning system and battery cooling system, to utilize the heat from the exhaust pipe and save energy. Furthermore, the heat exchange pipe used for heat exchange of the exhaust pipe is also installed in the door sill, without occupying other space in the lower part of the vehicle body, thus utilizing the heat from the exhaust pipe without taking up additional space.

[0043] To better understand the lower vehicle body structure and its arrangement provided in this application, the lower vehicle body structure will be described in detail below with reference to specific embodiments and accompanying drawings.

[0044] Example 1

[0045] The lower vehicle body structure provided by this utility model, such as Figure 1 As shown, it includes an exhaust pipe sill integrated structure 1, a heat dissipation device 2, and a power battery 3.

[0046] Among them, such as Figure 2 As shown, the exhaust pipe sill integrated structure 1 includes a sill 10, an exhaust pipe 11, and a heat exchange pipe 12. The sill 10 has a cavity extending along its length and penetrating both ends of the sill 10, wherein the cavity can be a circular cross-section. The exhaust pipe 11 passes through the cavity, and the heat exchange pipe 12 passes through the cavity and is sleeved on the outer periphery of the exhaust pipe 11 to form an inner cavity for heat transfer. That is, from the cross-section of the cavity (not shown in the figure), the exhaust pipe 11 and the heat exchange pipe 12 are arranged from the inside to the outside, and the exhaust pipe 11 and the heat exchange pipe 12 should be fixedly connected to the cavity at least at a certain position (such as both ends). The inner cavity of the heat exchange pipe 12 is used for the flow of the first cooling medium, and the heat exchange pipe 12 has a communication port 13 communicating with the inner cavity. During exhaust, the temperature of the outer wall of the exhaust pipe 11 generally exceeds 100°C. By installing a heat exchange tube 12 around the exhaust pipe 11 for heat exchange, the temperature of the outer wall of the heat exchange tube 12 can be ensured not to exceed 120°C, thus preventing the high temperature of the exhaust pipe 11 from damaging the threshold 10 and surrounding parts.

[0047] Specifically, the lower body structure has two door sills, one on the left and one on the right. The exhaust pipe door sill integration structure 1 is one of the door sills. The left or right door sill can be set as needed. Figure 1 The diagram shows that the sill 10 in the exhaust pipe sill integrated structure 1 is the left sill, and the right sill 4 can be a conventional sill structure in this field. The heat exchange pipe 12 can enter the sill 10 from one end of the sill 10 or from the side of one end of the sill 10. The specific arrangement can be designed according to the feasibility of the overall vehicle layout.

[0048] In one specific embodiment, the sill 10 in the exhaust pipe sill integrated structure 1 is formed by extrusion molding, resulting in high strength, good structural space utilization, and effective integration of the exhaust pipe 11. Furthermore, the areas of the sill 10 other than the cavity can be designed according to the requirements of vehicle side impact, vertical load-bearing, etc., and can be a cavity structure, a solid structure, a distributed support structure, or a structure with heat insulation material. In one specific embodiment, such as... Figure 2 As shown, the sill 10 includes a sill beam 101, an inner tube 102, and a support frame 103; wherein the sill beam 101 forms the outer periphery of the sill 10, the inner tube 102 is disposed in the sill beam 101, and the interior of the inner tube 102 forms a cavity; the cross-section of the support frame 103 is honeycomb-shaped or honeycomb-like, and it is disposed between the outer wall of the inner tube 102 and the inner wall of the sill beam 101. This arrangement makes the exhaust pipe sill integrated structure 1 have a large vertical stiffness and can bear the energy required for the side collision of the whole vehicle as much as possible in the lateral direction.

[0049] In one specific embodiment, a gap extending along the outer periphery of the heat exchange tube 12 is provided between the outer wall surface of the heat exchange tube 12 and the inner wall surface of the cavity to reduce heat exchange between the first cooling medium in the heat exchange tube 12 and the outside of the threshold 10, thereby preventing the first cooling medium from damaging the threshold 10. The two ends of the heat exchange tube 12 can be connected to the threshold 10 by welding, flanges, plugs, etc., thus fixing the heat exchange tube 12 and the threshold 10 at both ends. In one specific embodiment, such as... Figure 2 As shown, the exhaust pipe threshold integrated structure 1 also includes an annular block 14, and the annular block 14 is disposed between the inner wall surface of the end of the cavity and the outer wall surface of the heat exchange tube 12 at the corresponding position; wherein the annular block 14 can be made of high temperature resistant metal or rubber.

[0050] Furthermore, such as Figure 2 As shown, the end of the heat exchange tube 12 extends outward and protrudes beyond the end of the threshold 10, and the connecting port 13 is located at the end of the heat exchange tube 12, that is, the connecting port 13 is located outside the end of the threshold 10.

[0051] It should be noted that the first cooling medium can specifically be a mixed solution with water or oil as the main components and relevant additives. The exhaust pipe 11 in the exhaust pipe sill integrated structure 1 is part of the gas engine exhaust pipe, and the lower body structure also includes other parts of the exhaust pipe; in one specific embodiment, such as Figure 1 As shown, the lower body structure also includes an exhaust pipe front section 5 which is closer to the front of the body than the sill 10 and an exhaust pipe rear section 6 which is closer to the rear of the body than the sill 10. The exhaust pipe front section 5 includes a catalytic converter 51, a flexible pipe 52, and a central muffler 53 arranged in the direction from the gas engine to the exhaust pipe sill integrated structure 1. The exhaust pipe rear section 6 includes a tail muffler 61.

[0052] like Figure 1 and Figure 2 As shown, the heat dissipation device 2 includes multiple heat exchangers (20, 21) and a flow path switching component 22. The flow path switching component 22 is disposed between the multiple heat exchangers (20, 21) and the connection port 13, and can selectively connect one of the multiple heat exchangers (20, 21) to the connection port 13 of the heat exchange tube 12, so that the heat exchange tube 12 is connected to the corresponding heat exchanger to form a cooling circuit; that is, multiple different cooling circuits can be formed between the heat exchange tube 12 and the multiple heat exchangers (20, 21). By controlling the flow path switching component 22, one of the cooling circuits can be controlled to be open. After the first cooling medium in the heat exchange tube 12 exchanges heat with the exhaust pipe 11, it flows out through the connection port 13 and enters the corresponding heat exchanger along the open cooling circuit for heat exchange.

[0053] Specifically, the number of heat exchangers can be set as needed, such as two, three, four, or more. One heat exchanger can be configured to exchange heat with the air outside the vehicle body, so that heat can be directly dissipated to the outside when the heat of the exhaust pipe 11 is not needed. Other heat exchangers can be set as needed, and can be heat exchangers of one or more systems such as the air conditioning thermal management system, battery thermal management system, and gas engine thermal management system. Thus, when the heat of these thermal management systems is insufficient, the first cooling medium can exchange heat with other thermal management systems through the corresponding heat exchangers to utilize the heat of the exhaust pipe 11 and save energy. The flow path switching component 22 can be a multi-way valve or include multiple single-way valves, so that the cooling circuit corresponding to each heat exchanger is equipped with a single-way valve. When there is no hot air discharged from the exhaust pipe 11, the multiple single-way valves are closed. When there is hot air in the exhaust pipe 11, the corresponding single-way valve is controlled to open as needed, so that the cooling circuit between the required heat exchanger and the heat exchange tube 12 is connected to realize heat exchange. In one specific embodiment, the flow path switching component 22 is set as a multi-way valve.

[0054] It should be noted that the flow path switching component 22 should be connected to a relevant controller so that the flow path switching component 22 can be controlled by the controller. Specifically, it can be connected to the controller of the vehicle thermal management system.

[0055] In one specific implementation, such as Figure 1 As shown, the multiple heat exchangers include a first heat exchanger 20 and a second heat exchanger 21. The flow path switching component 22 can selectively connect the first heat exchanger 20 or the second heat exchanger 21 to the communication port 13 of the heat exchange tube 12, so that the heat exchange tube 12 is connected to the first heat exchanger 20 to form a first cooling circuit, or the heat exchange tube 12 is connected to the second heat exchanger 21 to form a second cooling circuit.

[0056] Among them, such as Figure 3 As shown, the first heat exchanger 20 has a first flow channel 201 and a second flow channel 202 that are independently arranged. The interior of the first flow channel 201 is used to connect with the heat exchange tube 12 to form a first cooling circuit for the flow of the first cooling medium. The interior of the second flow channel 202 is used for the flow of the second cooling medium, so that the first cooling medium and the second cooling medium can exchange heat. The first heat exchanger 20 can be a heat exchanger for one of the following systems: an air conditioning thermal management system, a battery thermal management system, or a gas engine thermal management system. It is generally installed in a closed space inside the vehicle body and is part of the vehicle's internal heat dissipation structure. When hot air passes through the exhaust pipe 11 and the thermal management system requires heat, the first cooling medium can exchange heat with the thermal management system through the first heat exchanger 20. Figure 4 As shown, the second heat exchanger 21 has a heat exchange channel 211. The interior of the heat exchange channel 211 is used to connect with the heat exchange tube 12 to form a second cooling circuit for the flow of the first cooling medium. This allows the first cooling medium to exchange heat with the air outside the heat exchange channel 211, so that the heat can be directly dissipated to the outside. Specifically, the second heat exchanger 21 can be installed in a position on the vehicle body facing outward and connected to the outside, so that it can exchange heat with the outside air through natural convection when the vehicle is in motion. Furthermore, the flow path switching component 22 can be a three-way valve.

[0057] In one specific embodiment, the first cooling medium is a cooling medium that can switch between a gaseous and a liquid state. Specifically, the first cooling medium is generally liquid at normal temperature and pressure, but can vaporize into a gaseous state when heated by the high temperature of the exhaust gas, such as when exchanging heat with high-temperature exhaust gas in heat exchange tube 12. Simultaneously, the first cooling medium should contain certain anti-corrosion and antifreeze agents to prevent corrosion of the pipeline during long-term storage, and the first cooling medium should not easily freeze into a solid state at low temperatures. Specifically, the first cooling medium can be a water-based coolant composed of water, antifreeze, and rust inhibitor.

[0058] Furthermore, such as Figure 1As shown, the connecting port 13, the flow path switching component 22, and each heat exchanger (20 and 21) are arranged sequentially from low to high along the height direction of the lower body structure. The first cooling medium in the heat exchange tube 12 becomes gaseous after heat exchange and rises. Then, it automatically rises through the connecting port 13, passes through the flow path switching component 22, and enters the heat exchanger (20 or 21) of the conductive cooling circuit for heat exchange. After heat exchange, it becomes liquid and can flow downward back to the heat exchange tube 12. This eliminates the need for additional pumps or other auxiliary devices to facilitate the flow of the first cooling medium, saving space and cost.

[0059] In one specific implementation, such as Figures 1-4 As shown, the flow path switching component 22 includes a heat exchange interface 221 and multiple heat dissipation interfaces corresponding to multiple heat exchangers. The multiple heat dissipation interfaces include a first heat dissipation interface 222 and a second heat dissipation interface 223. The heat exchange interface 221 is connected to and communicates with the communication port 13 of the heat exchange tube 12. The first heat dissipation interface 222 is connected to the first heat exchanger 20 through the first guide pipe 23 and communicates with the first flow channel 201. The second heat dissipation interface 223 is connected to the second heat exchanger 21 through the second guide pipe 24 and communicates with the heat exchange flow channel 211.

[0060] The flow path switching component 22 can selectively connect the flow path between the first heat dissipation interface 222 or the second heat dissipation interface 223 and the heat exchange interface 221. When the flow path between the first heat dissipation interface 222 and the heat exchange interface 221 of the flow path switching component 22 is connected, the heat exchange tube 12, the connecting port 13, the heat exchange interface 221 of the flow path switching component 22, the first heat dissipation interface 222, the first guide tube 23 and the first flow channel 201 of the first heat exchanger 20 are connected to form a first cooling circuit. When the flow path between the second heat dissipation interface 223 and the heat exchange interface 221 of the flow path switching component 22 is connected, the heat exchange tube 12, the connecting port 13, the heat exchange interface 221 of the flow path switching component 22, the second heat dissipation interface 223, the second guide tube 24 and the heat exchange flow channel 211 of the second heat exchanger 21 are connected to form a second cooling circuit.

[0061] The above configuration forms a closed cooling loop with the heat exchanger 12, a guide pipe (23 or 24), and the corresponding heat exchanger (20 or 21). This cooling loop has fewer components and a simpler structure. The first cooling medium in the heat exchanger 12 becomes gaseous after heat exchange and rises through the guide pipe. The flow path switching component 22 controls the flow path to rise from either the first guide pipe 23 or the second guide pipe 24. Taking the case where the automotive thermal management system has sufficient heat and no excess heat is needed as an example, the flow path switching component 22 switches to connect the heat exchanger 12 to the second guide pipe 24. The first cooling medium rises through the second guide pipe 24 to the second heat exchanger 21, where it exchanges heat with the air outside the second heat exchanger 21, dissipating the heat into the outside air. After heat exchange, the temperature of the first cooling medium decreases and condenses into a liquid state in the second heat exchanger 21. Because the second heat exchanger 21 is installed higher than the heat exchange tube 12, the liquid first cooling medium flows back to the heat exchange tube 12 through the second guide pipe 24. Through continuous evaporation and reflux, the high temperature of the exhaust pipe 11 will be carried away, thereby ensuring that the threshold 10 and surrounding parts are within a safe temperature range.

[0062] In one specific embodiment, the extension directions of the first guide pipe 23 and the second guide pipe 24 are both at an angle greater than or equal to 5° with the first plane, and the first plane is perpendicular to the height direction of the lower vehicle body structure, i.e., on the horizontal plane; the first guide pipe 23 and the second guide pipe 24 are set at this angle to ensure the speed of the return flow of the first cooling medium.

[0063] In one specific embodiment, the first guide pipe 23 and the second guide pipe 24 are made of heat-insulating material to prevent the temperature dissipation of the gaseous first cooling medium in the first guide pipe 23 and the second guide pipe 24 from having an adverse effect on the vehicle body parts.

[0064] In one specific implementation, such as Figure 3As shown, the first heat exchanger 20 includes a first collector 203, a water tank 204, multiple first heat dissipation pipes 205, and multiple first fins 206; wherein the water tank 204 has a second flow channel 202, and also has a liquid inlet 2041 and a liquid outlet 2042, and the liquid inlet 2041 and the liquid outlet 2042 are respectively used to connect with the vehicle's thermal management system, for allowing the second cooling medium to flow into and out of the second flow channel 202; the multiple first heat dissipation pipes 205 and the multiple first fins 206 are disposed in the water tank 204; the multiple first heat dissipation pipes 205 extend along the lower part of the vehicle... The body structure extends in the height direction and is arranged side by side at intervals to form a first flow channel 201, wherein multiple first heat dissipation pipes 205 can be arranged to be parallel to each other; multiple first fins 206 are arranged on the outer periphery of multiple first heat dissipation pipes 205; a first collector 203 is arranged below the water tank 204, and the upper end of the first collector 203 is connected to each first heat dissipation pipe 205, and the lower end is connected to the end of the first guide pipe 23 away from the first heat dissipation interface 222. The first collector 203 collects and returns the liquid first cooling medium obtained after cooling to the first guide pipe 23.

[0065] In one specific implementation, such as Figure 4 As shown, the second heat exchanger 21 includes a second heat collector 212, a plurality of second heat dissipation pipes 213, and a plurality of second fins 214; wherein the plurality of second heat dissipation pipes 213 extend along the height direction of the lower vehicle body structure and are arranged side by side at intervals to form a heat exchange channel 211, wherein the plurality of second heat dissipation pipes 213 can be arranged to be parallel to each other; the plurality of second fins 214 are disposed on the outer periphery of the plurality of second heat dissipation pipes 213; the second heat collector 212 is disposed below the plurality of second heat dissipation pipes 213, and the upper end of the second heat collector 212 is connected to each second heat dissipation pipe 213, and the lower end is connected to the end of the second guide pipe 24 away from the second heat dissipation interface 223, and the liquid first cooling medium obtained after cooling is collected and returned to the second guide pipe 24 through the second heat collector 212.

[0066] In one specific implementation, such as Figure 1 As shown, the lower body structure includes two heat dissipation devices 2, which are respectively set at both ends of the exhaust pipe sill integration structure 1; that is, a heat dissipation device 2 is set at the front end and the rear end of the sill 10 respectively. By operating the two heat dissipation devices 2 simultaneously, the heat of the exhaust pipe 11 in the exhaust pipe sill integration structure 1 can be dissipated quickly.

[0067] The lower body structure provided by this utility model can utilize the first cooling medium for heat exchange and heat circulation, and conduct heat from the exhaust pipe, thereby allowing the exhaust pipe to be arranged inside the door sill. This effectively utilizes the space of the lower body structure, improves structural efficiency, and provides sufficient space for the power battery; making the overall structure compact and energy-efficient.

[0068] Example 2

[0069] This utility model also provides a hybrid vehicle, including the lower body structure of Embodiment 1. Specifically, the exhaust pipe sill integration structure in the lower body structure is connected to the A, B, and C pillar areas, as well as the floor and seat crossbeam areas of the entire vehicle.

[0070] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model is presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to that embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. In order to provide a deep understanding of this utility model, many specific details are included in the above description, and this utility model may also be implemented without using these details. In addition, in order to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0071] It should be noted that similar reference numerals and letters in this specification are similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0072] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0073] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0074] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0075] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A lower vehicle body structure, characterized in that, include: An exhaust pipe sill integrated structure includes a sill, an exhaust pipe, and a heat exchange pipe. The sill has a cavity extending along its length and penetrating both ends of the sill. The exhaust pipe passes through the cavity. The heat exchange pipe passes through the cavity and is sleeved around the outer periphery of the exhaust pipe to achieve heat transfer. The inner cavity of the heat exchange pipe is used for the flow of a first cooling medium, and the heat exchange pipe has a communication port communicating with the inner cavity. A heat dissipation device includes multiple heat exchangers and a flow path switching component. The flow path switching component is disposed between the multiple heat exchangers and the communication port, and can selectively connect one of the multiple heat exchangers to the communication port of the heat exchange tube, so that the heat exchange tube and the corresponding heat exchanger are connected to form a cooling circuit.

2. The lower vehicle body structure as described in claim 1, characterized in that, The plurality of heat exchangers includes a first heat exchanger and a second heat exchanger. The flow path switching component can selectively connect the first heat exchanger or the second heat exchanger to the communication port of the heat exchange tube, so that the heat exchange tube is connected to the first heat exchanger to form a first cooling circuit, or the heat exchange tube is connected to the second heat exchanger to form a second cooling circuit; wherein The first heat exchanger has a first flow channel and a second flow channel that are independently arranged. The interior of the first flow channel is used to communicate with the heat exchange tube to form the first cooling circuit for the flow of the first cooling medium. The interior of the second flow channel is used to allow the flow of the second cooling medium so that the first cooling medium and the second cooling medium can exchange heat. The second heat exchanger has a heat exchange channel, the interior of which is used to communicate with the heat exchange tube to form a second cooling circuit for the flow of the first cooling medium, so that the first cooling medium and the air outside the heat exchange channel exchange heat.

3. The lower vehicle body structure as described in claim 2, characterized in that, The first cooling medium is a cooling medium that can switch between gaseous and liquid states; The connecting port, the flow path switching component, and each of the heat exchangers are arranged sequentially from low to high along the height direction of the lower vehicle body structure.

4. The lower vehicle body structure as described in claim 2, characterized in that, The flow path switching component includes a heat exchange interface and a plurality of heat dissipation interfaces corresponding to the plurality of heat exchangers. The plurality of heat dissipation interfaces include a first heat dissipation interface and a second heat dissipation interface. The heat exchange interface is connected to and communicates with the communication port of the heat exchange tube. The first heat dissipation interface is connected to the first heat exchanger through a first guide pipe and communicates with the first flow channel. The second heat dissipation interface is connected to the second heat exchanger through a second guide pipe and communicates with the heat exchange flow channel. The flow path switching component can selectively connect the flow path between the first heat dissipation interface or the second heat dissipation interface and the heat exchange interface; When the flow path between the first heat dissipation interface and the heat exchange interface of the flow path switching component is connected, the heat exchange tube, the connecting port, the heat exchange interface of the flow path switching component, the first heat dissipation interface, the first guide tube and the first flow channel of the first heat exchanger are connected to form the first cooling circuit. When the flow path between the second heat dissipation interface and the heat exchange interface of the flow path switching component is connected, the heat exchange tube, the connecting port, the heat exchange interface of the flow path switching component, the second heat dissipation interface, the second guide tube and the heat exchange channel of the second heat exchanger are connected to form the second cooling circuit.

5. The lower vehicle body structure as described in claim 4, characterized in that, The angle between the extension directions of the first guide pipe and the second guide pipe and the first plane is greater than or equal to 5°, and the first plane is perpendicular to the height direction of the lower vehicle body structure. The first and second guide tubes are made of heat-insulating material.

6. The lower vehicle body structure as described in claim 4, characterized in that, The first heat exchanger includes a first collector, a water tank, multiple first heat dissipation tubes, and multiple first fins; wherein The water tank has a second flow channel, an inlet, and an outlet, and the inlet and outlet are respectively used to communicate with the vehicle thermal management system to allow the second cooling medium to flow into and out of the second flow channel; the plurality of first heat dissipation pipes and the plurality of first fins are disposed in the water tank; the plurality of first heat dissipation pipes extend along the height direction of the lower body structure and are arranged side by side at intervals to form the first flow channel; the plurality of first fins are disposed on the outer periphery of the plurality of first heat dissipation pipes; the first collector is disposed below the water tank, and the upper end of the first collector is connected to each of the first heat dissipation pipes, and the lower end is connected to one end of the first guide pipe; The second heat exchanger includes a second collector, multiple second heat dissipation tubes, and multiple second fins; wherein The plurality of second heat dissipation pipes extend along the height direction of the lower vehicle body structure and are arranged side by side at intervals to form the heat exchange channel; the plurality of second fins are disposed on the outer periphery of the plurality of second heat dissipation pipes; the second current collector is disposed below the plurality of second heat dissipation pipes, and the upper end of the second current collector is connected to each second heat dissipation pipe, and the lower end is connected to one end of the second guide pipe.

7. The lower vehicle body structure as described in claim 1, characterized in that, The exhaust pipe threshold integrated structure also includes an annular plug; there is a gap extending in the outer circumferential direction between the outer wall surface of the heat exchange tube and the inner wall surface of the cavity, and the annular plug is disposed between the inner wall surface of the end of the cavity and the outer wall surface of the heat exchange tube at the corresponding position. The end of the heat exchange tube extends outward beyond the end of the threshold, and the communication port is located at the end of the heat exchange tube.

8. The lower vehicle body structure as described in any one of claims 1-7, characterized in that, The lower body structure includes two heat dissipation devices, which are respectively disposed at both ends of the exhaust pipe sill integration structure; The flow path switching component is configured as a multi-way valve.

9. The lower vehicle body structure as described in any one of claims 1-7, characterized in that, The threshold includes a threshold beam, an inner tube, and a support frame; wherein... The threshold beam forms the outer periphery of the threshold, the inner tube is disposed in the threshold beam and the cavity is formed inside the inner tube; the support frame has a honeycomb cross-section and is disposed between the outer wall of the inner tube and the inner wall of the threshold beam. The threshold is formed by extrusion molding.

10. A hybrid vehicle, characterized in that, Includes the lower body structure as described in any one of claims 1-9.

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