A battery pack cooling system for range-extended tractors

Abstract

This utility model discloses a battery pack cooling system for a range-extended tractor, including a heat exchanger, an electronic water pump connected between the inlet and outlet of the heat exchanger, and a battery pack. A mechanical compressor, a three-way valve, and a first condenser are sequentially connected between the outlet and inlet of the heat exchanger. A second condenser and an evaporator for cooling the passenger compartment are sequentially connected between the other port of the three-way valve and the outlet of the heat exchanger. It features low cost, reduced system layout space, and ensures sufficient additional cooling capacity for the battery pack, allowing for rapid cooling even under extreme operating conditions.

Description

Technical Field

[0001] This utility model relates to the field of battery pack cooling technology, and in particular to a battery pack cooling system for range-extended tractors. Background Technology

[0002] Currently, the battery pack cooling systems used in extended-range passenger vehicles, commercial vehicles, and tractors mostly employ water-cooling technology. Water-cooling technology involves refrigerant passing through an electronic compressor, condenser, and expansion valve before entering the heat exchanger. Simultaneously, the coolant inside the battery pack enters the heat exchanger via an electronic water pump. Heat exchange occurs between the coolant and refrigerant in the heat exchanger, with the refrigerant carrying away the heat from the coolant. The low-temperature coolant then enters the battery pack and carries away the heat from the battery, ensuring that the battery pack's operating temperature does not become too high.

[0003] However, this technology has the following problems: 1. Using an electronic compressor results in high costs; 2. The power of the electronic compressor is fixed. Under certain extreme conditions, it cannot provide additional cooling capacity to accelerate the cooling of the battery pack, and it will also increase the space required for installation. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a battery pack cooling system for range-extended tractors.

[0005] The objective of this utility model is achieved through the following technical solution: This utility model provides a battery pack cooling system for a range-extending tractor, including a heat exchanger, an electronic water pump connected to the heat exchanger and an outlet, and a battery pack. A mechanical compressor, a three-way valve, and a first condenser are sequentially connected between the outlet and inlet of the heat exchanger. The other port of the three-way valve is connected in sequence to the pipe between the outlet of the heat exchanger and the second condenser and the evaporator for cooling the passenger cabin.

[0006] This utility model has the following advantages: 1. This solution uses a mechanical compressor, which has low cost; 2. This solution uses a three-way valve to connect the branch of the second condenser and the evaporator, which is directly used to cool the passenger cabin, reducing the system layout space; 3. By adopting this system, the battery pack can be guaranteed to have sufficient additional cooling capacity to ensure that the battery pack can be cooled quickly under extreme operating conditions. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0010] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0011] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0012] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0013] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this 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 this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0014] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 utility model based on the specific circumstances.

[0015] like Figure 1 As shown, this utility model discloses a battery pack cooling system for a range-extended tractor, including a heat exchanger, a battery pack, a mechanical compressor, a three-way valve, a first condenser, a second condenser, and an evaporator for cooling the passenger compartment. The heat exchanger includes a liquid inlet, a liquid outlet, an air outlet, and an air inlet; an electric water pump and the battery pack are sequentially connected between the liquid inlet and the liquid outlet of the heat exchanger; the mechanical compressor, the three-way valve, and the first condenser are sequentially connected between the air outlet and the air inlet of the heat exchanger; the two ends of the three-way valve are respectively connected to the mechanical compressor and the first condenser; the second condenser and the evaporator are sequentially connected between the other port (the third port) of the three-way valve and the air outlet of the heat exchanger.

[0016] To facilitate the injection of coolant into the battery pack, an expansion tank is connected between the outlet of the battery pack and the inlet of the electronic water pump.

[0017] The heat exchanger is equipped with a first expansion valve at its air inlet. The evaporator is equipped with a second expansion valve at its air inlet.

[0018] To facilitate control over the cooling effect on the battery pack and both sides of the passenger compartment, the preferred three-way valve is a three-way proportional valve.

[0019] The above system, employing a mechanical compressor for refrigeration, significantly reduces costs compared to existing electronic compressors and effectively ensures sufficient additional cooling capacity for the battery pack, enabling rapid cooling even under extreme conditions. A branch line connected to the compressor via a three-way valve directly supplies cooling to the passenger cabin, avoiding the need for dual compressors and greatly reducing the system's footprint.

[0020] Using the above system, different control modes can be achieved by controlling the three-way proportional valve: Only the passenger compartment is cooled: At this time, the three-way proportional valve will completely shut off one end of the battery pack, that is, close one end of the first condenser. The refrigerant will enter the second condenser, the second expansion valve, and the evaporator in the passenger compartment before returning to the compressor. Only the battery pack is cooled: At this time, the three-way proportional valve will completely shut off one end of the passenger compartment, that is, close one end of the second condenser. The refrigerant will enter the first condenser, the first expansion valve, and the heat exchanger of the battery pack and then return to the compressor. The battery pack and passenger compartment are cooled simultaneously: At this time, the three-way proportional valve will be in the middle state. By adjusting its opening, the refrigerant flows into the second condenser, the second expansion valve, the evaporator, the first condenser, the first expansion valve, the heat exchanger and then back to the compressor.

[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A battery pack cooling system for a range-extended tractor, comprising a heat exchanger, an electric water pump connected to an inlet and an outlet of the heat exchanger, and a battery pack; characterized in that: A mechanical compressor, a three-way valve, and a first condenser are sequentially connected between the outlet and inlet of the heat exchanger. The other port of the three-way valve is connected in sequence to the pipe between the outlet of the heat exchanger and the second condenser and the evaporator for cooling the passenger cabin.

2. The battery pack cooling system for a range-extended tractor according to claim 1, characterized in that: An expansion tank is connected between the outlet of the battery pack and the inlet of the electronic water pump.

3. The battery pack cooling system for a range-extended tractor according to claim 1, characterized in that: The heat exchanger is equipped with a first expansion valve at its air inlet.

4. The battery pack cooling system for a range-extended tractor according to claim 1, characterized in that: The evaporator is equipped with a second expansion valve at its air inlet.

5. The battery pack cooling system for a range-extended tractor according to claim 1, characterized in that: The three-way valve is a three-way proportional valve.

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