All-electric aircraft power battery thermal management system

Abstract

The utility model provides an all-electric aircraft power battery thermal management system, which comprises a spray chamber, a power supply system and a power supply system, the sprayer is arranged at the inner top of the spraying chamber and is positioned right above the lithium battery pack; an air outlet of the fan is communicated with the spraying chamber; an outlet of the heater is connected with the fan; an inlet of the condenser is communicated with the top of the spraying chamber, and a gas outlet of the condenser is connected with an inlet of the heater; an inlet of the pump is connected with a liquid outlet of the condenser; an inlet of the heat exchanger is connected with an outlet of the pump, and an outlet of the heat exchanger is connected with the sprayer through a control valve. According to the system, low-temperature preheating, efficient heat dissipation and thermal runaway suppression are integrated, the thermal environment of the battery is comprehensively monitored and managed, and it is ensured that the battery can play the best performance in various flight missions.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery thermal management technical field especially is related to a full electric aircraft power battery thermal management system. BACKGROUND

[0002] Low temperature preheating technology: the low temperature preheating technology of power battery mainly focuses on how to quickly promote the temperature of battery to restore its performance in low temperature environment. The existing technology includes using the independent liquid circuit of high pressure heater to preheat, combining battery management system (BMS) to realize the rapid heating of battery, preventing battery overdischarge, overcharge. In addition, there are researches focusing on internal preheating method, such as using battery internal resistance to generate heat through battery discharge or applying alternating current, and self-heating battery technology.

[0003] High-efficiency heat dissipation technology: high-efficiency heat dissipation technology involves heat collection, transmission and dissipation of thermal management system, such as the multi-path high-efficiency heat collection and transmission means and the heat dissipation engineering implementation approach based on stealth mentioned in the search results. This includes using cold plate, series-parallel hybrid pipe network for heat collection, and using air / air heat exchanger, air / liquid heat exchanger, etc. for heat source collection. In addition, it also involves flow regulation for temperature control, internal and external circulation heat comprehensive control, multi-mode reconstruction technology and other control means.

[0004] Thermal runaway suppression technology: thermal runaway suppression technology is an important part of battery safety management, which involves the monitoring and control mechanism of battery thermal management system.

[0005] The existing low temperature preheating technology, such as air preheating and liquid preheating system, usually faces the problems of low heat transfer efficiency and long heating time. These systems may need a long time to raise the temperature of the battery, resulting in high energy consumption in the preheating process. During the preheating process, there may be a large temperature difference inside the battery pack, affecting the performance and life of the battery. The design and control strategy of the preheating system is relatively complex, which needs to be accurately controlled to avoid battery overheating or other heat-related problems.

[0006] Although the air cooling technology has a simple structure, its cooling efficiency is relatively low, and it is not good at controlling the uniformity of the temperature of the battery pack. Although the liquid cooling technology has high cooling efficiency, it has complex structure, potential liquid leakage risk, and may increase the weight of the system. The heat pipe cooling technology has high thermal conductivity, but the cost is high, the structure is complex, and the temperature uniformity is general.

[0007] Although various thermal management technologies have been proposed to prevent thermal runaway, these technologies often cannot completely avoid the occurrence of thermal runaway, especially under extreme conditions. Once thermal runaway occurs, its chain reaction is rapid, and existing thermal management measures may be difficult to effectively control and suppress the thermal runaway process. UTILITY MODEL CONTENT

[0008] The utility model provides a kind of all-electric aircraft power battery thermal management system, the system of low-temperature preheating, high-efficiency heat dissipation, thermal runaway suppression is integrated, it is the key thermal management technology in aviation electric propulsion system, the thermal environment of battery is comprehensively monitored and managed, ensure that battery can exert best performance in various flight tasks.

[0009] To achieve the above object, the utility model adopts the following technical scheme:

[0010] An all-electric aircraft power battery thermal management system, comprising:

[0011] Spray chamber, its inside is provided with lithium battery group;

[0012] Sprayer, set up in the inner top of the spray chamber, is located in the just above lithium battery group;

[0013] Fan, its air outlet is connected with the spray chamber;

[0014] Heater, its outlet is connected with the fan;

[0015] Condenser, its inlet is connected with the top of the spray chamber, and its gas outlet is connected with the inlet of the heater;

[0016] Pump, its inlet is connected with the liquid outlet of the condenser;

[0017] Heat exchanger, its inlet is connected with the outlet of the pump, and its outlet is connected with the sprayer through control valve;

[0018] Wherein, the heat exchanger, control valve, spray chamber, sprayer, condenser and pump constitute liquid spray cooling system, to realize the high-efficiency heat dissipation of lithium battery surface;The heater, fan, spray chamber and condenser constitute air circulation system, to realize the low-temperature preheating of lithium battery.

[0019] In the specification, the all-electric aircraft power battery thermal management system further includes liquid collection dish, the liquid collection dish is located in the inner bottom of the spray chamber, the liquid collection dish is located in the just below lithium battery group, and the outlet of the liquid collection dish is connected with the inlet of the pump.

[0020] In the specification, the working medium of the liquid spray cooling system is perfluorohexanone.

[0021] Summarized above, the utility model has at least the following beneficial effects:

[0022] The utility model discloses a heating air circulation is used to improve the heat transfer efficiency of the whole all -electric aircraft power battery heat management system, realizes the low temperature preheating of lithium battery, and is favorable to the safe, efficient start of all -electric aircraft power battery.

[0023] Lithium battery thermal runaway suppression can realize the rapid cooling of air and battery surface, and when the lithium battery produces uncontrolled heating and fire, the perfluorohexanone is used to extinguish the fire.

[0024] The utility model discloses a low temperature preheating, efficient heat dissipation, thermal runaway cooling agent suppression integration, can break through the single function limitation of existing heat management system. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced the drawing needed to be used in the embodiment description, obviously, the drawing in the following description only is some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings.

[0026] Figure 1 It is the schematic diagram of all -electric aircraft power battery heat management system involved in the utility model.

[0027] Figure 2 It is the internal schematic diagram of spray chamber involved in the utility model.

[0028] 1, lithium battery group;2, liquid collection dish;3, sprayer;4, spray chamber;5, fan;6, heater;7, condenser;8, pump;9, heat exchanger;10, control valve. DETAILED DESCRIPTION

[0029] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the utility model. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0030] The disclosure below provides many different implementations or examples to implement different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present application. In addition, the embodiments of the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various implementations and / or settings discussed.

[0031] The embodiments of the present application will be described in detail below with reference to the drawings.

[0032] As Figure 1 shown, the present embodiment provides a full-electric aircraft power battery thermal management system, comprising:

[0033] A spray chamber 4 is provided inside the lithium battery pack 1;

[0034] A sprayer 3 is arranged at the inner top of the spray chamber 4, directly above the lithium battery pack 1;

[0035] A fan 5, whose air outlet communicates with the spray chamber 4;

[0036] A heater 6, whose outlet is connected with the fan 5;

[0037] A condenser 7, whose inlet communicates with the top of the spray chamber 4, and whose gas outlet is connected with the inlet of the heater 6;

[0038] A pump 8, whose inlet is connected with the liquid outlet of the condenser 7;

[0039] A heat exchanger 9, whose inlet is connected with the outlet of the pump 8, and whose outlet is connected with the sprayer 3 through a control valve 10;

[0040] Among them, the heat exchanger 9, the control valve 10, the spray chamber 4, the sprayer 3, the condenser 7 and the pump 8 constitute a liquid spray cooling system to realize efficient heat dissipation of the surface of the lithium battery; the heater 6, the fan 5, the spray chamber 4 and the condenser 7 constitute an air circulation system to realize low-temperature preheating of the lithium battery.

[0041] In some embodiments, the full-electric aircraft power battery thermal management system further comprises a liquid collection tray 2, which is arranged at the inner bottom of the spray chamber 4, directly below the lithium battery pack 1, and the outlet of the liquid collection tray 2 is connected with the inlet of the pump 8.

[0042] In some embodiments, the working medium of the liquid spray cooling system is perfluorohexanone.

[0043] The specific working process is as follows:

[0044] (1) Preheating by circulating heated air

[0045] Heated air circulation involves introducing and circulating external air, driven by fan 5 to create convection within the battery system. This improves the overall heat transfer efficiency and allows for low-temperature preheating of the lithium battery. To effectively ensure the battery system's operating efficiency and safety, the rapid preheating process is only initiated before the battery starts operating and when its SOC is below 3%. After preheating, the charging process is switched to prevent irreversible damage to the battery. Heated air circulation preheating is integrated into the battery thermal management system as an auxiliary function. By adjusting the heating power of the heating elements, the temperature of the circulating air is raised to 30°C. Simultaneously, the fan speed of the air circulation system is controlled to achieve a wind speed of 1 m / s. Introducing external air creates a "closed" preheating channel for the lithium battery pack 1, ensuring continuous air circulation and recovering waste heat from the flowing air.

[0046] (2) Air-assisted spray cooling of lithium batteries

[0047] A combination of forced air circulation and liquid spray cooling is employed to achieve efficient heat dissipation from the lithium battery surface. The droplets generated by the spray cooling directly impact the battery surface, forming a thin liquid film. A significant amount of heat is carried away through droplet impact deformation, evaporation, and convection within the liquid film. Simultaneously, the atomized droplets enter the circulating airflow, where gas-liquid interaction absorbs heat. Perfluorohexanone (C6F) is used as a heat transfer medium. 12 O) is used as the working medium, with a boiling point of 49.2℃. Its sensible and latent heat can be fully utilized within the operating temperature range of lithium batteries. When the battery temperature is below C6F... 12 At boiling point O, the liquid drips down the battery surface and collects in the container below; when the battery temperature is below C6F... 12 At boiling point O, C6F 12 O vaporizes to form steam, and under the driving force of air circulation, C6F... 12 O vapor enters condenser 7 to form liquid.

[0048] (3) Suppression of thermal runaway in lithium batteries

[0049] When the battery temperature exceeds 60°C, C6F can be increased. 12 The O-flow initiation enables emergency rapid cooling. At this point, the air completely vaporizes upon approaching or reaching the battery surface, utilizing latent heat to rapidly cool both the air and the battery surface. Driven by air circulation, C6F... 12 O vapor enters condenser 7 to form liquid, thus achieving circulation. Furthermore, when the lithium battery generates uncontrollable heat and causes an open flame, C6F... 12O vapor rapidly diffuses throughout the device, extinguishing the fire at a concentration of 4% to 6%. Perfluorohexanone vapor isolates oxygen, thus extinguishing the flame. It also decomposes at high temperatures, converting into stable products with H and OH free radicals in the flame, thereby interrupting the combustion chain reaction.

[0050] In summary, during the low-temperature preheating stage, the air previously introduced into the system is circulated by fan 5, creating convection within the system. This significantly improves the heat transfer efficiency, thus achieving low-temperature preheating of the lithium battery. Finally, based on the heating characteristics of the lithium battery, an optimal heating air circulation preheating strategy is developed. By controlling the fan speed 5, a preheating channel for the lithium battery pack 1 is formed after the introduction of external air, achieving air circulation and waste heat recovery. During the heat dissipation process, perfluorohexanone is used as the working medium. The droplets formed under air circulation will impact the battery surface during heat dissipation, forming a liquid film. Through droplet impact deformation, evaporation, and convection within the liquid film, a large amount of heat is carried away, effectively cooling the lithium battery. During the thermal runaway suppression stage, perfluorohexanone vapor rapidly fills the test chamber, interrupting the combustion chain reaction. Under air circulation, the perfluorohexanone vapor enters the condenser 7 to form liquid, thus achieving circulation.

[0051] The embodiments described above are for illustrative purposes only and are not intended to limit the present invention. Therefore, any changes in numerical values ​​or substitutions of equivalent elements should still fall within the scope of the present invention.

[0052] The above detailed description enables those skilled in the art to understand that this utility model can indeed achieve the aforementioned objectives and has complied with the provisions of the Patent Law.

[0053] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention. The above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. It should be noted that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0054] It should be noted that the above description of the process is for illustrative purposes only and does not limit the scope of this specification. Those skilled in the art can make various modifications and changes to the process under the guidance of this specification. However, these modifications and changes remain within the scope of this specification.

[0055] The basic concepts have been described above. Obviously, for those skilled in the art who have read this application, the above disclosure of the utility model is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore, such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this application.

[0056] Furthermore, this application uses specific terms to describe its embodiments. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different positions in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0057] Similarly, it should be noted that, in order to simplify the description disclosed in this application and thus help in understanding one or more utility model embodiments, the foregoing description of the embodiments of this application may sometimes combine multiple features into one embodiment, drawing or description thereof.

Claims

1. A thermal management system for a power battery of an all-electric aircraft, characterized in that, include: The spray chamber is equipped with a lithium battery pack. The sprayer is located at the top inside the spray chamber, directly above the lithium battery pack; A fan, the air outlet of which is connected to the spray chamber; A heater, the outlet of which is connected to the fan; A condenser, the inlet of which is connected to the top of the spray chamber, and the gas outlet of which is connected to the inlet of the heater; A pump, the inlet of which is connected to the liquid outlet of the condenser; The heat exchanger has its inlet connected to the outlet of the pump, and its outlet connected to the sprayer via a control valve. The heat exchanger, control valve, spray chamber, sprayer, condenser, and pump constitute a liquid spray cooling system to achieve efficient heat dissipation from the surface of the lithium battery. The heater, fan, spray chamber, and condenser constitute an air circulation system to achieve low-temperature preheating of the lithium battery.

2. The all-electric aircraft power battery thermal management system according to claim 1, characterized in that, It also includes a liquid collection dish, which is located at the bottom of the spray chamber and directly below the lithium battery pack. The outlet of the liquid collection dish is connected to the inlet of the pump.

3. The all-electric aircraft power battery thermal management system according to claim 1, characterized in that, The working medium of the liquid spray cooling system is perfluorohexanone.

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