A hybrid vehicle engine and battery waste heat recovery system

Abstract

This patent discloses a waste heat recovery system for hybrid vehicle engines and batteries. The system comprises a pulsating heat pipe, a waste heat collection unit, a circulating working fluid tank for waste heat collection, a pump, and a controller. The pulsating heat pipe is in close contact with the engine and battery, while the heat storage device in the waste heat collection unit is filled with two different phase-change energy storage materials that are not in contact with each other. This invention not only recovers waste heat from hybrid vehicles, but more importantly, the heat storage device can also recover heat of different qualities, allowing for more efficient recovery and storage of waste heat generated by the vehicle.

Description

Technical Field

[0001] The present invention relates to the field of waste heat recovery, in particular to a waste heat recovery system for a hybrid vehicle engine and battery. Background Art

[0002] With the dwindling reserves of traditional fossil fuels and increasingly severe environmental problems, automobiles, one of the world's largest industrial consumer goods, are inevitably facing a need to reduce their reliance on fuel. However, due to numerous technical and cost challenges, completely phasing out fuel vehicles in the short term remains extremely difficult. Hybrid vehicles are considered the most promising way to transition from traditional fuel vehicles to pollution-free, zero-emission new energy vehicles. Hybrid vehicles combine the powertrain of traditional fuel vehicles with a battery-powered electric motor. They offer the long driving range of traditional fuel vehicles with the zero emissions and pollution-free nature of new energy vehicles, achieving a complementary advantage. This type of vehicle not only reduces fuel consumption but also provides a practical platform for electric vehicle technology, providing an opportunity for the accumulation of advanced technologies and, as a result, has become a hot topic of international research.

[0003] Hybrid vehicles typically have two power systems: a fuel-powered system and an electric system. Effective heat recovery and utilization facilitates efficient coordination and operation between these systems, reducing energy waste. Therefore, this invention provides a system for recovering engine and battery waste heat in hybrid vehicles based on a pulsating heat pipe and a heat storage device. The pulsating heat pipe quickly and efficiently transfers heat, while the heat storage device stores the waste heat. This not only accelerates heat dissipation from the engine and battery, but also allows for the recovery and reuse of waste heat from the engine and battery. Summary of the Invention

[0004] The purpose of the present invention is to propose a scheme for a hybrid vehicle engine and battery waste heat recovery system. In view of the characteristics of hybrid power, the present invention uses a pulsating heat pipe to quickly conduct the waste heat generated by the engine and battery, and uses a heat storage device to recover and store the conducted heat. This not only enables the engine and battery to effectively dissipate heat but also fully recovers the lost heat, reducing waste heat waste. In order to achieve the above purpose, the present invention provides the following technical scheme: a hybrid vehicle engine and battery waste heat recovery system is composed of a closed loop consisting of waste heat generated by the engine (1), waste heat generated by the battery (2), a first pulsating heat pipe (3), a second pulsating heat pipe (4), a waste heat collection part (5), a circulating working fluid box (6) used for waste heat collection, a pump (7), and a first controller (8) to conduct and collect and store the waste heat generated by the engine (1) and the waste heat generated by the battery (2). The pulsating heat pipe transfers the waste heat of the engine and the battery to the working fluid water used for waste heat collection in the closed loop; the flow path of the working fluid water during the waste heat storage process performed by the waste heat collection part (5) is controlled by the second controller (5-3), and the heat storage device (5-0) stores the heat carried by the working fluid water in the phase change energy storage material; the flow path of the working fluid water in the entire closed loop when receiving the heat transferred by the pulsating heat pipe is controlled by the first controller (8).

[0005] Preferably, the working fluid used in the pulsating heat pipe should ensure normal operation at the engine exhaust temperature and the battery heating temperature. Based on the average temperature of the engine exhaust being between 500°C and 800°C, the filling fluid selected for the first pulsating heat pipe (3) is potassium; based on the average temperature of the battery heating being between 40°C and 80°C, the filling fluid selected for the second pulsating heat pipe (4) is acetone.

[0006] Preferably, the waste heat collection part (5) can not only collect high-quality heat from the engine exhaust but also collect low-quality heat from the battery, so the phase change energy storage materials used should be two different materials to ensure that different qualities of heat can be effectively recovered.

[0007] Furthermore, the two phase change energy storage materials used in the waste heat collection part (5) should not be mixed with each other in any state, and a heat insulating layer should be filled between the two materials.

[0008] Preferably, the working medium water used in the circulating working medium box (6) for waste heat collection has the advantages of high sensible heat, low cost, and no pollution.

[0009] Preferably, the first controller (8) and the second controller (5-3) judge and control the flow path of the working medium water based on the temperature. The control requirements must be accurate and the response conversion process must be fast.

[0010] The gain effect of the present invention:

[0011] (1) The present invention can quickly extract and recover the waste heat from the engine and battery of a hybrid vehicle, thereby achieving the goal of energy conservation and environmental protection and reducing heat loss.

[0012] (2) The patented invention uses a pulsating heat pipe to enhance the rapid conduction effect of waste heat.

[0013] (3) The heat storage device used in the present invention adopts a variety of phase change energy storage materials to achieve the recovery of heat of different qualities. Compared with traditional heat storage devices, it can fully recover waste heat with the smallest equipment volume and quantity, thereby improving the space utilization rate of the car.

[0014] (4) The present invention uses a controller to control the flow path of the circulating working medium water used in the waste heat collection process, thereby achieving rapid and accurate energy collection and improving energy collection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This invention patents a hybrid vehicle engine and battery waste heat recovery system.

[0016] Figure 2 Schematic diagram of the waste heat collection part.

[0017] 1. Waste heat generated by the engine; 2. Waste heat generated by the battery; 3. First pulsating heat pipe; 4. Second pulsating heat pipe; 5. Waste heat collection unit; 6. Circulating working medium box for waste heat collection; 7. Pump;

[0018] 8. First controller; 5-0. Thermal storage device; 5-1. High-temperature phase-change energy storage material; 5-2. Medium- and low-temperature phase-change energy storage material; 5-3. Second controller; 5-4. Thermal insulation layer DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] As shown in the figure, the present invention provides a hybrid vehicle engine and battery waste heat recovery system. During the operation of the vehicle, a pump (7) extracts working medium water from a circulating working medium box (6) used for waste heat collection. If a first controller (8) determines that the engine is currently operating, a passage to a first pulsating heat pipe (3) is opened. The waste heat (1) generated by the engine is transferred to the working medium water through the first pulsating heat pipe (3). The working medium water then enters a waste heat collection part (5) for heat storage. The working medium water enters a heat storage device (5-0) through a first pipe inlet and transfers heat to a high-temperature phase-change energy storage material (5-1). After the working medium water flows out of the first pipe outlet, a second controller (5-3) determines whether the temperature of the working medium water still has storable quality heat. If so, the working medium water enters a third pipe inlet. The third pipe filled with medium and low temperature phase change energy storage material (5-2) stores heat, and the working medium water flows out of the outlet of the third pipe and flows back to the circulating working medium box (6) used for waste heat collection. If the second controller (5-3) determines that the temperature of the working medium water after flowing out of the outlet of the first pipe is not worth storing heat again, it flows directly back to the circulating working medium box (6) used for waste heat collection. If the first controller (8) determines that the battery is currently working, it opens the passage to the second pulsating heat pipe (4), and the waste heat (2) generated by the battery is transferred to the working medium water through the second pulsating heat pipe (4). The working medium water directly enters the heat storage device (5-0) through the inlet of the second pipe, transfers the heat to the medium and low temperature phase change energy storage material (5-2), and then flows out of the second pipe outlet and flows back to the circulating working medium box (6) used for waste heat collection.

[0021] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field within the technical scope, design concepts and methods disclosed in the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A hybrid vehicle engine and battery waste heat recovery system, characterized by: The entire system is composed of a first pulsating heat pipe (3), a second pulsating heat pipe (4), a waste heat collection part (5), a circulating working medium box (6) used for waste heat collection, a pump (7), and a first controller (8), forming a closed loop. Two different materials are used to effectively recover heat of different qualities. The pulsating heat pipe transfers waste heat energy generated by engine exhaust and battery heating to working medium water used for waste heat collection in the closed loop; the working medium water stores the waste heat energy in the phase change material of the waste heat collection part (5); The first controller (8) controls the flow path of the working medium water according to the source of the waste heat energy. Similarly, during the waste heat energy storage process, the second controller (5-3) regulates the flow path of the working medium water, and the first controller (8) determines whether the engine or the battery is currently operating. If the engine is working at this time, the working medium water enters the heat storage device (5-0) through the first pipe inlet and transfers heat to the high-temperature phase change energy storage material (5-1); after the working medium water flows out of the first pipe outlet, the second controller (5-3) determines whether the temperature of the working medium water still has storable quality heat. If the heat energy is still worth storing, the working medium water enters the third pipe filled with medium and low temperature phase change energy storage material (5-2) through the third pipe inlet for heat storage. After the working medium water flows out of the third pipe outlet, it flows back to the circulating work used for waste heat collection. If the second controller (5-3) determines that the temperature of the working medium water after flowing out of the first pipe outlet is not worth storing heat again, it will directly flow back to the circulating working medium box (6) used for waste heat collection; if the first controller (8) determines that the battery is currently working, it will open the passage to the second pulsating heat pipe (4), and the working medium water will directly enter the heat storage device (5-0) through the second pipe inlet to transfer heat to the medium and low temperature phase change energy storage material (5-2), and then flow out of the second pipe outlet and flow back to the circulating working medium box (6) used for waste heat collection.

2. The hybrid vehicle engine and battery waste heat recovery system according to claim 1, characterized in that: The first pulsating heat pipe (3) is responsible for transferring waste heat energy from the engine exhaust, and the average temperature of the engine exhaust corresponding to the first pulsating heat pipe (3) is between 500°C and 800°C, that is, the working fluid selected for filling the first pulsating heat pipe (3) is potassium. The second pulsating heat pipe (4) is responsible for transferring waste heat energy generated by the battery, and the average temperature of the battery corresponding to the second pulsating heat pipe (4) when heated is between 40°C and 80°C, that is, the working fluid selected for filling the second pulsating heat pipe (4) is acetone.

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