A double-chiller parallel structure based on a water-cooled unit of a commercial vehicle

Abstract

The utility model relates to the field of automobile thermal management technology belongs to a kind of based on commercial vehicle water cooling unit's double chiller parallel structure, including first circuit and second circuit, and the first circuit is coupled with second circuit by Chiller unit connection, and the Chiller unit includes Chiller unit one, Chiller unit two and parallel pipeline, and the Chiller unit one and Chiller unit two are connected in parallel by parallel pipeline.The utility model can adjust work mode according to specific work load adaptability, under high load working condition, two Chiller units work cooperatively, provide greater coolant flow and pressure.Obstacle avoidance ability also be significantly improved, the refrigerant circulation path of each Chiller unit is independent, and does not affect each other.When refrigerant leakage or refrigeration system failure, another Chiller unit can continue to work, ensure the normal operation of cooling system, improve the reliability and fault tolerance of system.

Description

Technical Field

[0001] This utility model relates to the field of automotive thermal management technology, and belongs to a dual-chiller parallel structure based on commercial vehicle water-cooled units. Background Technology

[0002] Currently, in the field of electric vehicle thermal management, the demand for thermal management of large-capacity battery packs is becoming increasingly prominent. Single-chiller cooling systems have been used in some models and early designs due to their simple structure and low cost. However, with the improvement of battery energy density, the popularization of fast charging technology, and the increasing complexity of system operating conditions, this type of system has gradually revealed the following limitations in practical industry applications: Insufficient cooling efficiency: Under high load conditions, the cooling power and coolant flow of a single Chiller system are limited, making it difficult to meet the heat dissipation requirements of large-capacity battery packs.

[0003] Low reliability: The single Chiller system has poor fault tolerance. Once critical components such as the refrigeration compressor, condenser or water pump fail, the entire cooling system will fail, posing a safety hazard.

[0004] High energy consumption: A single Chiller system consumes a lot of energy when running under high load, and it is difficult to flexibly adjust the cooling power according to the actual heat dissipation needs.

[0005] Uneven coolant distribution: The coolant distribution in the existing system is uneven, resulting in insufficient heat dissipation for some battery modules, which affects the overall performance and lifespan of the battery pack. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model provides a dual-chiller parallel structure based on a commercial vehicle water-cooled unit.

[0007] To achieve the above objectives, this utility model provides the following technical solution: This application provides a dual-chiller parallel structure based on a commercial vehicle water-cooled unit, including a first circuit and a second circuit. The first circuit and the second circuit are connected and coupled through a Chiller unit. The Chiller unit includes a first Chiller unit, a second Chiller unit, and a parallel pipeline. The first Chiller unit and the second Chiller unit are connected in parallel through the parallel pipeline.

[0008] Preferably, the parallel piping includes a first parallel piping and a second parallel piping, wherein the first parallel piping is connected in parallel to the coolant side channel of Chiller Unit 1 and the coolant side channel of Chiller Unit 2, and the second parallel piping is connected in parallel to the refrigerant side channel of Chiller Unit 1 and the refrigerant side channel of Chiller Unit 2.

[0009] Preferably, the second parallel pipeline is provided with an electronic expansion valve one and an electronic expansion valve two. The electronic expansion valve one is connected to the refrigerant side output terminal of the Chiller unit one, and the electronic expansion valve two is connected to the refrigerant side output terminal of the Chiller unit two.

[0010] Preferably, the second circuit further includes a compressor and a condenser, which are connected sequentially according to the refrigerant flow direction. The compressor input is connected between electronic expansion valve one and electronic expansion valve two, and the condenser output is connected to the refrigerant side input of the Chiller unit.

[0011] Preferably, the first circuit further includes a battery pack and a water pump, wherein the battery pack and the water pump are connected in series along the coolant flow direction, the output end of the water pump is connected to the coolant side input end of the Chiller unit, and the coolant side output end of the Chiller unit is connected to the input end of the battery pack.

[0012] Preferably, temperature sensors are provided at both ends of the battery pack.

[0013] Compared with existing technologies, this utility model provides a dual-chiller parallel structure based on a commercial vehicle water-cooled unit, which has the following advantages: This invention employs a parallel dual-chiller structure, which can adaptively adjust its operating mode according to specific workloads. Under high load conditions, the two chiiller units work together to provide greater coolant flow and pressure. Under low load conditions, only one chiiller unit needs to be activated to meet cooling requirements, reducing energy consumption. Furthermore, the cooling function is enhanced; the parallel dual-chiller structure provides greater cooling power, rapidly reducing coolant temperature and ensuring the battery pack remains within a suitable operating temperature range even under high load conditions. Obstacle avoidance capabilities are also significantly improved, as each chiiller unit has an independent refrigerant circulation path, ensuring no interference between them. In the event of refrigerant leakage or refrigeration system failure, the other chiiller unit can continue to operate, ensuring the normal operation of the cooling system and improving system reliability and fault tolerance.

[0014] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall framework of this utility model; In the diagram: 1. Chiller Unit 1; 2. Chiller Unit 2; 3. Parallel piping; 4. Battery pack; 5. Water pump; 6. Compressor; 7. Condenser; 31. First parallel piping; 32. Second parallel piping; 33. Electronic expansion valve 1; 34. Electronic expansion valve 2; 41. Temperature sensor. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concepts of the present utility model.

[0017] See Figure 1 This application provides a dual-chiller parallel structure based on a commercial vehicle water-cooled unit, including a first circuit and a second circuit. The first circuit and the second circuit are connected and coupled through a Chiller unit. The Chiller unit includes a Chiller unit 1, a Chiller unit 2, and a parallel pipeline 3. The Chiller unit 1 and the Chiller unit 2 are connected in parallel through the parallel pipeline 3.

[0018] Specifically, the parallel pipeline 3 includes a first parallel pipeline 31 and a second parallel pipeline 32. The first parallel pipeline 31 is connected in parallel to the coolant side channel of Chiller Unit 1 and the coolant side channel of Chiller Unit 2. The second parallel pipeline 32 is connected in parallel to the refrigerant side channel of Chiller Unit 1 and the refrigerant side channel of Chiller Unit 2.

[0019] Specifically, the second parallel pipeline 32 is equipped with an electronic expansion valve 33 and an electronic expansion valve 34. The electronic expansion valve 33 is connected to the refrigerant-side output terminal of the Chiller unit 1, and the electronic expansion valve 34 is connected to the refrigerant-side output terminal of the Chiller unit 2. In actual use, the refrigerant flow rate is controlled by adjusting the opening degree of the electronic expansion valves 33 and 34.

[0020] Specifically, the second circuit also includes a compressor 6 and a condenser 7, which are connected in sequence according to the refrigerant flow direction. The input end of the compressor 6 is connected between electronic expansion valve 1 (EXV1) 33 and electronic expansion valve 2 (EXV2) 34, and the output end of the condenser 7 is connected to the refrigerant side input end of the Chiller unit.

[0021] Specifically, the first circuit also includes a battery pack 4 and a water pump 5. The battery pack 4 and the water pump 5 are connected in series along the coolant flow direction. The output end of the water pump 5 is connected to the coolant side input end of the Chiller unit, and the coolant side output end of the Chiller unit is connected to the input end of the battery pack 4.

[0022] Specifically, temperature sensors 41 are provided at both ends of the battery pack 4, and the temperature sensors 41 are used to detect the system temperature.

[0023] The compressor, condenser, chiller, electronic expansion valve, and other components involved in the electrical control mechanisms described in this utility model patent are all prior art known and widely used in the field. The specific model selection, internal circuit structure, and basic working principles (such as signal acquisition, data processing, and command output logic) of the aforementioned thermal management components have been fully disclosed in relevant professional literature and product technical manuals. Those skilled in the art can directly select the appropriate model and implement conventional connection and debugging based on the parameter requirements of the actual application scenario. Therefore, to highlight the innovative points of this utility model and avoid redundancy in the specification, the thermal management components within the scope of the aforementioned prior art will not be described in detail here.

[0024] The working principle of this utility model: The compressor 6, condenser 7, and water pump 5 are shared by Chiller Unit 1 and Chiller Unit 2. Under high load conditions, Chiller Unit 1 and Chiller Unit 2 work together to provide greater coolant flow and pressure. Under low load conditions, only one Chiller unit is activated to meet cooling requirements while reducing energy consumption. When it is necessary to control the flow rate or flow path, the opening of electronic expansion valve 33 and electronic expansion valve 34 is adjusted to cool the battery pack 4 accordingly. If one Chiller unit experiences refrigerant leakage or a refrigeration system failure, the other Chiller unit can continue to operate, ensuring the normal operation of the cooling system and improving system reliability and fault tolerance.

[0025] The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dual-chiller parallel structure based on a commercial vehicle water-cooled unit, characterized in that: It includes a first loop and a second loop, the first loop and the second loop are connected and coupled through a Chiller unit, the Chiller unit includes Chiller unit one (1), Chiller unit two (2) and parallel pipeline (3), the Chiller unit one (1) and Chiller unit two (2) are connected in parallel through parallel pipeline (3).

2. The dual-chiller parallel structure based on a commercial vehicle water-cooled unit as described in claim 1, characterized in that: The parallel pipeline (3) includes a first parallel pipeline (31) and a second parallel pipeline (32). The first parallel pipeline (31) is connected in parallel to the coolant side channel of Chiller Unit 1 (1) and the coolant side channel of Chiller Unit 2 (2). The second parallel pipeline (32) is connected in parallel to the refrigerant side channel of Chiller Unit 1 (1) and the refrigerant side channel of Chiller Unit 2 (2).

3. The dual-chiller parallel structure based on a commercial vehicle water-cooled unit as described in claim 2, characterized in that: The second parallel pipeline (32) is equipped with an electronic expansion valve one (33) and an electronic expansion valve two (34). The electronic expansion valve one (33) is connected to the refrigerant side output end of the Chiller unit one (1), and the electronic expansion valve two (34) is connected to the refrigerant side output end of the Chiller unit two (2).

4. The dual-chiller parallel structure based on a commercial vehicle water-cooled unit as described in claim 3, characterized in that: The second circuit also includes a compressor (6) and a condenser (7), which are connected in series according to the refrigerant flow direction. The input end of the compressor (6) is connected between electronic expansion valve one (33) and electronic expansion valve two (34), and the output end of the condenser (7) is connected to the refrigerant side input end of the Chiller unit.

5. The dual-chiller parallel structure based on a commercial vehicle water-cooled unit as described in claim 1, characterized in that: The first circuit also includes a battery pack (4) and a water pump (5). The battery pack (4) and the water pump (5) are connected in series along the coolant flow direction. The output end of the water pump (5) is connected to the coolant side input end of the Chiller unit, and the coolant side output end of the Chiller unit is connected to the input end of the battery pack (4).

6. The dual-chiller parallel structure based on a commercial vehicle water-cooled unit as described in claim 5, characterized in that: Temperature sensors (41) are provided at both ends of the battery pack (4).

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