Battery thermal management system of electric motor coach air conditioner

Abstract

The utility model relates to the field of electric motor coach air conditioners, in particular to a battery thermal management system of an electric motor coach air conditioner. Comprising an air conditioning system and a battery thermal management system, the battery thermal management system comprises a battery water cooling system, a plate heat exchanger, a PTC liquid cooling heater and a liquid cooling pipeline, and the liquid cooling pipeline connected with a water inlet pipe of the battery water cooling system is sequentially connected with the plate heat exchanger and the PTC liquid cooling heater. The water inlet pipe and a water outlet pipe of the battery water-cooling system form a circulation loop; the refrigerating pipeline is separated from the inlet end of a main expansion valve of the air conditioning system and is sequentially connected with a liquid cooling expansion valve, the plate heat exchanger and the gas-liquid separator in series. According to the system, through flexible switching between a refrigeration mode and a heating mode, a battery can be cooled through air cooling and water cooling in a high-temperature environment, the battery is heated through the PTC liquid cooling heater and the heat pump in a low-temperature environment, and it is ensured that the battery always works within the optimal temperature range.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of electric bus air conditioning field, specifically a kind of battery thermal management system of electric bus air conditioner. BACKGROUND

[0002] With the popularity of electric bus, its core component-battery performance and life has been widely concerned. Battery thermal management system is crucial to keep the battery in the best working temperature range, which directly affects the efficiency and safety of battery. Traditional battery thermal management mostly uses air cooling or water cooling single mode to control the temperature of battery in suitable range, to prevent performance degradation or security risks caused by battery overheating in high temperature environment.

[0003] However, the prior art generally ignores the decline in battery performance and the increase in heat demand in extreme low temperature environment. Under low temperature conditions, the battery not only needs effective insulation, but may even need active heating to ensure its performance stability and safe operation.

[0004] At the same time, the air conditioning system in the prior art has significantly reduced heat pump heating efficiency in low temperature environment, which cannot meet the simultaneous heating demand of the vehicle and the battery. In order to solve this problem, the present case is generated. SUMMARY

[0005] The utility model provides a kind of battery thermal management system of electric bus air conditioner to the technical problem existing in prior art, by the depth integration of battery thermal management system and air conditioning system, the comprehensive management of battery temperature and heat is realized.

[0006] The technical scheme for solving the above technical problem of the utility model is as follows: a kind of battery thermal management system of electric bus air conditioner, including air conditioning system and battery thermal management system, the air conditioning system includes compressor, four-way reversing valve, condenser core assembly, drying filter, main expansion valve, evaporator core assembly and gas-liquid separator, evaporator core assembly is provided with evaporative fan in the vicinity, condensing fan is provided in the vicinity of condenser core assembly,

[0007] The battery thermal management system includes battery water cooling system, plate heat exchanger, PTC liquid cooling heater and liquid cooling pipeline, the liquid cooling pipeline connected with the water inlet pipe of the battery water cooling system is sequentially connected with the plate heat exchanger, the PTC liquid cooling heater, and the water outlet pipe of the battery water cooling system forms a circulation loop.

[0008] It also includes a refrigeration pipeline, which branches off from the inlet of the main expansion valve of the air conditioning system and connects in series with the liquid-cooled expansion valve, the plate heat exchanger, and the gas-liquid separator. Integrating the air conditioning system with the battery thermal management system enables comprehensive management of battery temperature and heat. Through the plate heat exchanger and PTC liquid-cooled heater, efficient cooling and heating of the battery are achieved, ensuring that the battery operates within its optimal temperature range.

[0009] Furthermore, the walls of the refrigeration pipes and the liquid cooling pipes located within the plate heat exchanger are in contact.

[0010] Furthermore, the refrigeration pipes located within the plate heat exchanger are arranged parallel to the liquid cooling pipes located within the plate heat exchanger at intervals.

[0011] Furthermore, the PTC liquid-cooled heater is provided with a heating tube, which is arranged parallel to the liquid-cooled pipeline located in the PTC liquid-cooled heater at intervals and the pipe walls of the two are in contact.

[0012] Furthermore, the PTC liquid-cooled heater is located on the airflow path from the return air vent to the outlet air vent. The PTC liquid-cooled heater utilizes the air conditioning system for heating, reducing additional energy consumption and directly heating the air entering the vehicle, thus improving heating efficiency.

[0013] Furthermore, the evaporator core assembly is arranged on both sides of the PTC liquid-cooled heater, and the evaporator core assembly is arranged on both sides of the evaporator fan.

[0014] Furthermore, it also includes connecting pipelines, and the compressor, condenser core assembly, dryer filter, main expansion valve, evaporator core assembly and gas-liquid separator are connected in sequence through connecting pipelines. The connecting pipelines are also equipped with the four-way reversing valve, high-pressure switch, low-pressure switch, high-pressure charging valve, low-pressure charging valve, high-pressure shock-absorbing hose and low-pressure shock-absorbing hose.

[0015] Furthermore, it also includes an air conditioner housing, which comprises a bottom shell, an evaporator cover, and a condenser cover.

[0016] The beneficial effects of this utility model are:

[0017] 1. The PTC liquid cooling heater is provided with the evaporator core assembly on both sides, and the evaporator core assembly is provided with an evaporative fan on both sides. In a low temperature environment, the air conditioning system provides warm air for the vehicle, and the PTC liquid cooling heater can also heat the surrounding cold air. The evaporative fan blows out warm air for the vehicle from the air outlet of the automobile, and the PTC liquid cooling heater itself can also provide heat for the battery by heating the cooling liquid. This double heating mode not only solves the problem of insufficient heating efficiency in the low temperature environment in the prior art, but also realizes efficient use of energy, and further improves the adaptability and reliability of the electric bus in extreme environment.

[0018] 2. The system can cool the battery through air cooling and water cooling in a high temperature environment, and heat the battery through the PTC liquid cooling heater in a low temperature environment through flexible switching of the refrigeration mode and the heating mode, so that the battery always works in the best temperature range. At the same time, the air conditioning system can provide a comfortable temperature environment for the vehicle by switching the refrigeration and heating modes, realize double management of the battery and the temperature in the vehicle, and improve the overall performance and reliability of the electric bus. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structure diagram of the air conditioner shell is described in the utility model.

[0020] Figure 2 The structure diagram of the battery thermal management system of the electric bus air conditioner is described in the utility model.

[0021] Figure 3 The structure diagram of the PTC liquid cooling heater is described in the utility model.

[0022] In the drawings, the component list represented by each reference sign is as follows:

[0023] 1. Condenser cover plate, 2. Evaporator cover plate, 3. Bottom shell, 4. Condenser core assembly, 5. Evaporator core assembly, 6. Compressor, 7. Four-way reversing valve, 8. Main expansion valve, 9-1. Water inlet pipe, 9-2. Water outlet pipe, 10. Condenser fan, 11. Evaporative fan, 12. Gas-liquid separator, 13. Drying filter, 14. Connection pipeline, 14-1. Charging valve, 14-2. High pressure switch, 14-3. High pressure shock absorbing hose, 14-4. Low pressure switch, 14-5. Low pressure shock absorbing hose, 15. Liquid cooling expansion valve, 16. Plate heat exchanger, 17. PTC liquid cooling heater, 17-1. Liquid cooling inlet, 17-2. Liquid cooling outlet, 17-3. Heating pipe, 18. Liquid cooling pipeline. DETAILED DESCRIPTION

[0024] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0025] In the description of the present application, the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0026] In the description of the present application, the term "for example" is used to indicate "as an example, illustration or description". Any embodiment described as "for example" in the present application is not necessarily interpreted as more preferred or more advantageous than other embodiments. The following description is given in order to enable any person skilled in the art to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can realize the present application without using these specific details. In other examples, well-known structures and processes will not be described in detail to avoid unnecessary details making the description of the present application obscure. Therefore, the present application is not intended to be limited to the shown embodiments, but is consistent with the broadest scope of principles and features disclosed in the present application.

[0027] Embodiment 1

[0028] A battery thermal management system of an electric bus air conditioner, comprising an air conditioner shell, an air conditioner system and a battery thermal management system;

[0029] Among them, as Figures 1-2 The air conditioner shell comprises a bottom shell 3, an evaporator cover plate 2 and a condenser cover plate 1.

[0030] As Figure 2As shown, the air conditioning system comprises a compressor 6, a condenser core assembly 4, a drying filter 13, a main expansion valve 8, an evaporator core assembly 5 and a gas-liquid separator 12 connected in sequence through a connecting pipeline 14, an evaporating fan 11 is arranged near the evaporator core assembly 5, a condensing fan is arranged near the condenser core assembly 4, and a four-way reversing valve 7, a high-pressure switch 14-2, a low-pressure switch 14-4, a charging valve 14-1, a high-pressure shock-absorbing hose 14-3 and a low-pressure shock-absorbing hose 14-5 are further arranged on the connecting pipeline 14. The arrangement of the connecting pipeline 14, various valves and switches ensures stable operation of the system.

[0031] The air conditioning refrigeration principle is as follows: the refrigerant becomes high-temperature and high-pressure gaseous refrigerant after working of the compressor 6, is discharged from the discharge port of the compressor 6, directly flows into the condenser core assembly 4 through the shock-absorbing metal hose, and is condensed into medium-temperature liquid refrigerant in the condenser core assembly 4 through air-cooled heat exchange of the condensing fan. The water vapor possibly existing in the refrigerant is filtered out through the drying filter 13. Then, the refrigerant becomes low-temperature and low-pressure liquid refrigerant after throttling of the main expansion valve 8, is air-cooled and heat-exchanged in the evaporator core assembly 5 through the evaporating fan 11, evaporates and absorbs heat to become gaseous refrigerant, flows through the gas-liquid separator 12 for gas-liquid separation, and then completely gaseous refrigerant returns to the suction end of the compressor 6.

[0032] The air conditioning heating principle is as follows: the refrigerant becomes high-temperature and high-pressure gaseous refrigerant after being discharged from the compressor 6, flows into the evaporator core assembly 5 after working of the four-way reversing valve 7, and is air-cooled and heat-exchanged with air at this time, and the hot air enters the vehicle interior from the air outlet under the driving of the evaporating fan 11. The refrigerant after cooling sequentially passes through the main expansion valve 8, the drying filter 13, the condenser, and finally returns to the gas-liquid separator 12 to enter the suction end of the compressor 6.

[0033] The battery thermal management system comprises a battery water cooling system, a plate heat exchanger 16, a PTC liquid cooling heater 17 and a liquid cooling pipeline 18, the liquid cooling pipeline 18 connected with the water inlet pipe 9-1 of the battery water cooling system is connected with the plate heat exchanger 16, the PTC liquid cooling heater 17 and the water outlet pipe 9-2 of the battery water cooling system in sequence to form a circulating loop; and further comprises a refrigeration pipeline which is branched from the inlet end of the main expansion valve 8 of the air conditioning system and is connected with a liquid cooling expansion valve 15, the plate heat exchanger 16 and the gas-liquid separator 12 in sequence;

[0034] Specifically, the PTC liquid cooling heater 17 is arranged on both sides of the evaporator core assembly 5, and the evaporator fan 11 is arranged on both sides of the evaporator core assembly 5. The PTC liquid cooling heater 17 can also heat the surrounding air when it is started. In the air conditioning heating case, the air is blown out from the air outlet by the evaporator fan, which can realize auxiliary air conditioning heating. The PTC liquid cooling heater 17 uses the air conditioning system for heating, reduces the additional energy consumption, and can directly heat the air entering the vehicle, improving the heating efficiency.

[0035] The refrigeration pipeline in the plate heat exchanger 16 and the liquid cooling pipeline 18 in the plate heat exchanger 16 are arranged in parallel and in contact with the pipe wall. The parallel arrangement of the refrigeration pipeline and the liquid cooling pipeline 18 optimizes the flow of fluid and the heat exchange efficiency. The pipe wall contact design increases the heat exchange area and improves the heat exchange efficiency.

[0036] As shown in FIG. 1, the PTC liquid cooling heater 17 is arranged on both sides of the evaporator core assembly 5, and the evaporator fan 11 is arranged on both sides of the evaporator core assembly 5. Figure 3 As shown in FIG. 1, the PTC liquid cooling heater 17 is arranged on both sides of the evaporator core assembly 5, and the evaporator fan 11 is arranged on both sides of the evaporator core assembly 5.

[0037] In the air conditioning heating case, the battery is cooled, and the specific process is as follows:

[0038] The plate heat exchanger 16 is internally provided with a refrigeration pipeline and a liquid cooling pipeline 18. The high-temperature cooling liquid in the battery water cooling system enters the liquid cooling pipeline 18 in the plate heat exchanger 16, and at the same time, in the plate heat exchanger 16, the low-temperature refrigerant is in contact with the pipe wall for heat exchange, and then the low-temperature cooling liquid flows through the PTC liquid cooling heater 17 and returns to the battery water cooling system. The low-temperature cooling liquid exchanges heat with the surface of the battery, and under the action of the water pump of the whole vehicle, the cooling liquid repeatedly circulates in the entire battery water cooling system, so as to achieve the purpose of cooling the battery.

[0039] In the air conditioning heating case, the battery is cooled, and the specific process is as follows:

[0040] The high-temperature cooling liquid in the battery water cooling system enters the liquid cooling pipeline 18 in the plate heat exchanger 16, and exchanges heat with the low-temperature refrigerant in the plate heat exchanger 16 through the pipe wall, and then the low-temperature cooling liquid flows through the liquid cooling pipeline 18 in the PTC liquid cooling heater 17, and the air-conditioning cold air flows through the PTC liquid cooling heater 17, which also exchanges heat with the cooling liquid through air cooling. The low-temperature cooling liquid after two times of cooling returns to the battery water cooling system, and exchanges heat with the surface of the battery, and under the action of the water pump of the whole vehicle, the cooling liquid repeatedly circulates in the whole battery water cooling system, so as to achieve the purpose of cooling the battery.

[0041] In the case of heating the battery under extremely low temperature, the specific process is as follows:

[0042] The high-temperature refrigerant exchanges heat with the air through the evaporator core assembly 5, and then enters the plate heat exchanger 16 through the liquid cooling expansion valve 15. At this time, the temperature of the refrigerant is reduced, but due to the extremely low ambient temperature, it is generally still higher than the low-temperature cooling liquid in the battery water cooling system. At this time, the refrigerant exchanges heat with the low-temperature cooling liquid in the plate heat exchanger 16 for the first time, and then exchanges heat for the second time when flowing through the PTC liquid cooling heater 17. The PTC liquid cooling heater 17 can heat the low-temperature cooling liquid and the surrounding air at the same time. Since the PTC liquid cooling heater 17 is arranged on both sides of the evaporator core assembly 5, and the evaporator core assembly 5 is arranged on both sides of the evaporator fan 11, the hot air heated by the PTC liquid cooling heater 17 can be driven by the evaporator fan 11 to the vehicle interior from the air outlet. The heating of the vehicle interior and the heating of the battery cooling liquid can be realized at the same time.

[0043] Therefore, when the working environment temperature of the vehicle is too low, the heating effect of the air-conditioning heat pump is not up to the requirement, and the PTC liquid cooling heater 17 can be used. At this time, the cooling liquid flows through the PTC liquid cooling heater 17, and the air-conditioning can start the PTC heating mode.

[0044] Although the embodiments or examples of the present disclosure have been described with reference to the drawings, it should be understood that the above-mentioned methods, systems and devices are only exemplary embodiments or examples, and the scope of the present disclosure is not limited by these embodiments or examples, but only by the granted claims and their equivalent scope. Various elements in the embodiments or examples can be omitted or replaced by equivalent elements. In addition, each step can be performed in an order different from that described in the present disclosure. Further, various elements in the embodiments or examples can be combined in various ways. It is important that many of the elements described herein can be replaced by equivalent elements that appear after the present disclosure as technology evolves.

Claims

1. A battery thermal management system of an electric bus air conditioner, comprising an air conditioner system and a battery thermal management system, the air conditioner system comprising a compressor, a four-way reversing valve, a condenser core assembly, a drying filter, a main expansion valve, an evaporator core assembly, an evaporating fan arranged near the evaporator core assembly, and a condensing fan arranged near the condenser core assembly, characterized in that, the battery thermal management system comprises a battery water cooling system, a plate heat exchanger, a PTC liquid cooling heater, and a liquid cooling pipeline, the liquid cooling pipeline connected with the water inlet pipe of the battery water cooling system is connected with the plate heat exchanger, the PTC liquid cooling heater, and the water outlet pipe of the battery water cooling system in sequence to form a circulation loop; further comprising a refrigeration pipeline, the refrigeration pipeline is branched from the main expansion valve inlet end of the air conditioner system and connected with a liquid cooling expansion valve, the plate heat exchanger, and the gas-liquid separator in sequence.

2. The battery thermal management system for an electric bus air conditioner according to claim 1, wherein The refrigeration pipeline located in the plate heat exchanger is in contact with the pipe wall of the liquid cooling pipeline located in the plate heat exchanger.

3. The battery thermal management system for an electric bus air conditioner according to claim 2, wherein, The refrigeration pipeline located in the plate heat exchanger is arranged in parallel with the liquid cooling pipeline located in the plate heat exchanger.

4. The battery thermal management system for an electric bus air conditioner according to claim 1, wherein, The PTC liquid cooling heater is provided with a heating pipe, the heating pipe is arranged in parallel with the liquid cooling pipeline located in the PTC liquid cooling heater and in contact with the pipe wall of the liquid cooling pipeline.

5. The battery thermal management system for an electric bus air conditioner according to claim 1, wherein, The PTC liquid cooling heater is located on the air outlet flow path from the air return port to the air outlet port.

6. The battery thermal management system for an electric bus air conditioner according to claim 5, wherein The evaporator core assembly is arranged on both sides of the PTC liquid cooling heater, and the evaporating fan is arranged on both sides of the evaporator core assembly.

7. The battery thermal management system for an electric bus air conditioner according to claim 1, wherein Further comprising a connecting pipeline, the compressor, the condenser core assembly, the drying filter, the main expansion valve, the evaporator core assembly, and the gas-liquid separator are connected in sequence through the connecting pipeline, and the connecting pipeline is further provided with the four-way reversing valve, the high-pressure switch, the low-pressure switch, the high-pressure charging valve, the low-pressure charging valve, the high-pressure shock-absorbing hose, and the low-pressure shock-absorbing hose.

8. The battery thermal management system for an electric bus air conditioner according to claim 1, wherein, Further comprising an air conditioner shell, the air conditioner shell comprises a bottom shell, an evaporator cover plate, and a condenser cover plate.

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