Modularized rail transit power battery cooling device

Abstract

The utility model discloses a modularized rail transit power battery cooling device which comprises a shell, a fan, a radiator, a condenser, a compressor, a plate heat exchanger, a liquid supply pump, a liquid storage tank and a cooling liquid pipeline are installed in the shell, and the cooling liquid pipeline is communicated with a battery; the fan is installed in the shell, a radiator is arranged on the other side of the fan, one end of the radiator is communicated with a cooling liquid pipeline, the radiator is connected with a liquid storage tank through a pipeline, and the other end of the liquid storage tank is communicated with the cooling liquid pipeline through a liquid supply pump; according to the utility model, the shell is arranged on the battery, so that a single device cools a single battery, and the device is light in weight, modularized, standardized and good in replaceability.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cooling devices, in particular to a modular rail transit power battery cooling device. Background Technique

[0002] During the operation of the power battery pack for new energy rail transit locomotives, a large amount of heat will be generated. At present, the power battery pack for rail transit locomotives still follows the cooling method of conventional energy storage systems. A group of chillers are branched to cool multiple battery packs. As Figure 1 shown, in terms of its flow distribution, cooling management, and start-stop selection of battery packs, one-to-one correspondence cannot be achieved, resulting in a large structure of the locomotive power battery pack cooling system, high operating energy consumption, high installation difficulty, great maintenance difficulty, poor interchangeability, and complex control methods. Therefore, a modular power battery cooling device is designed to reduce the volume, make the device lightweight, modular, and standardized, and be able to select the corresponding number of modular cooling devices for power batteries of different specifications, with fast installation and convenient maintenance. Content of the Utility Model

[0003] The purpose of the utility model is to provide a modular rail transit power battery cooling device. By installing a single housing on a single battery and cooling a single battery with a single device, the device is made lightweight, modular, and standardized, with good replaceability, and can meet the heat dissipation requirements of rail transit locomotive power batteries of different specifications by increasing or decreasing the number of modules.

[0004] The utility model provides the following technical solution: A modular rail transit power battery cooling device includes a housing. A fan, a radiator, a condenser, a compressor, a plate heat exchanger, a liquid supply pump, a liquid storage tank, and a coolant pipeline are installed in the housing, and the coolant pipeline is connected to the battery;

[0005] A radiator is installed in the housing. A fan is arranged on one side of the radiator, and the fan is fixed in the housing. One end of the radiator is connected to the coolant pipeline, the radiator is connected to the liquid storage tank through a pipeline, and the other end of the liquid storage tank is connected to the coolant pipeline through a liquid supply pump;

[0006] The condenser is connected to the compressor, the other end of the condenser is connected to the primary side of the plate heat exchanger, an expansion valve is also connected between the condenser and the plate heat exchanger, the compressor is also connected to the primary side of the plate heat exchanger, the coolant pipeline is connected to the secondary side of the plate heat exchanger through an electric three-way valve, and the other end of the secondary side of the plate heat exchanger is connected to the liquid storage tank.

[0007] In order to avoid cooling the coolant with the lowest supply temperature, a bypass is connected between the expansion valve and the compressor, and a solenoid valve and a ball valve are installed on the bypass.

[0008] To be able to heat the coolant, a PTC heating device is also fixed inside the liquid storage tank.

[0009] To control the flow rate of the liquid supply, a flow sensor is also connected between the liquid storage tank and the coolant pipeline.

[0010] To protect the pipeline, a circuit communicating with the liquid storage tank is arranged on one side of the liquid supply pump, and a spring pressure valve is installed on the circuit.

[0011] To control the liquid level height of the liquid storage tank, two small float liquid level switches are fixed on the side of the liquid storage tank.

[0012] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows:

[0013] (1) By installing a single housing on a single battery, a single device cools a single battery, making the device lightweight, modular, and standardized, with good replaceability. The heat dissipation requirements of the power batteries of rail transit locomotives with different specifications can be met by increasing or decreasing the number of modules, achieving fast installation and convenient maintenance. At the same time, the development requirements of similar products are reduced, saving development costs;

[0014] (2) This cooling device has three different modes, which are convenient to be applied to different temperature scenarios, improving the applicable range of the device. Description of the Drawings

[0015] The drawings are used to provide further understanding of the present utility model, and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0016] Figure 1 is a schematic structural diagram of a chiller in the prior art;

[0017] Figure 2 is a perspective view of the modular battery cooling device of the present utility model;

[0018] Figure 3 is a top view of the internal structure of the battery cooling device of the present utility model;

[0019] Figure 4 is a perspective view of the internal structure of the battery cooling device of the present utility model;

[0020] Figure 5 is a schematic diagram of the principle of the battery cooling device of the present utility model;

[0021] In the figure: 1. Housing; 2. Fan; 3. Radiator; 4. Condenser; 5. Plate heat exchanger; 6. Compressor; 7. Liquid supply pump; 8. Coolant pipeline; 9. Liquid storage tank; 91. PTC heating device; 10. Solenoid valve; 11. Ball valve; 12. Expansion valve; 13. Electric three-way valve; 14. Small float level switch; 15. Flow sensor; 16. Spring pressure valve; 17. Battery. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0023] Please refer to Figures 2 to 4 , the present invention provides a technical solution: a modular rail transit power battery cooling device, including a housing 1, and a plurality of housings 1 are respectively installed on a plurality of batteries, so that a single battery cooling device can cool a single battery. A fan 2, a radiator 3, a condenser 4, a compressor 6, a plate heat exchanger 5, a liquid supply pump 7, a liquid storage tank 9 and a coolant pipeline 8 are installed in the housing 1. The cooling pipeline 8 is connected to the battery 17. On the other side of the fan 2, there are a radiator 3 and a condenser 4. The radiator 3 and the condenser 4 are fixed in the housing 1. The fan 2 is used to introduce cold air or natural wind into the radiator 3 to cool the coolant of the battery 17. This cooling device has three modes: a conventional heat dissipation mode, a refrigeration mode and a heating mode;

[0024] As Figure 5 shown, in the conventional heat dissipation mode: one end of the radiator 3 is connected to the coolant pipeline 8, the radiator 3 is connected to the liquid storage tank 9 through a pipeline, the other end of the liquid storage tank 9 is connected to the coolant pipeline 8, and a liquid supply pump 7 is also connected between the liquid storage tank 9 and the coolant pipeline 8. By the operation of the liquid supply pump 7, the coolant is introduced into the radiator 3, and the natural wind of the fan 2 is used to cool the radiator 3, reducing the temperature of the coolant entering the radiator 3. Subsequently, the cooled coolant is introduced into the coolant pipeline 8 to further reduce the temperature of the coolant in the coolant pipeline 8 and cool the battery 17. The conventional heat dissipation mode is used when the ambient temperature is between -50°C and 0°C. The device adopts conventional air-cooled heat dissipation and controls the supply temperature by starting and stopping the variable-frequency cooling fan at the same time;

[0025] Refrigeration mode: The condenser 4 is connected to the compressor 6. The other end of the condenser 4 is connected to the primary side of the plate heat exchanger 5. An expansion valve 12 is also connected between the condenser 4 and the plate heat exchanger 5. The compressor 6 is also connected to the primary side of the plate heat exchanger 5. The coolant pipeline 8 is connected to the secondary side of the plate heat exchanger 5 through an electric three-way valve 13. The other end of the secondary side of the plate heat exchanger 5 is connected to the liquid storage tank 9. By operating the compressor 6, the high-temperature and high-pressure gas generated by compression is introduced into the condenser, and through heat exchange, a low-temperature and high-pressure refrigerating liquid is formed. Subsequently, the refrigerating liquid is depressurized through the expansion valve 12. The refrigerating liquid vaporizes and absorbs heat in the plate heat exchanger 5, absorbing heat from the secondary side of the plate heat exchanger 5 and reducing the temperature of the coolant on the secondary side of the plate heat exchanger 5, enabling the cooled coolant to circulate in the coolant pipeline 8 and significantly reducing the temperature of the coolant. The refrigeration mode is used when the ambient temperature is higher than 0°C and the conventional air-cooled heat dissipation cannot meet the temperature control requirements. The device starts compression refrigeration to provide coolant within the required temperature range for the battery pack. The user can operate the unit compressor 6 at a constant speed. When the set temperature reaches the target value, the compressor 6 speed drops and stops. When the temperature reaches the reset value, the compressor 6 restarts;

[0026] Heating mode: A PTC heating device 91 is also fixed in the liquid storage tank 9. The coolant in the liquid storage tank 9 is heated by the PTC heating device 91. Using the liquid supply pump 7, the heated coolant is injected into the coolant pipeline 8, thereby increasing the temperature of the coolant. The heating mode is used when the ambient temperature is in the range of -50°C to +14°C. When the device is parked for a long time with the locomotive and the coolant temperature is lower than the minimum allowable liquid supply temperature, the electrothermal heating method is adopted to quickly heat the cooler to within the allowable range of the liquid supply temperature and complete the system preparation of the locomotive in the shortest time.

[0027] In this technical solution, the components inside the device are modularized, reducing the overall volume of the device and making the device lightweight, modular, and standardized. A single device cools a single battery 17, with quick installation and disassembly and good replaceability. Different specifications of the power battery heat dissipation requirements of rail transit locomotives can be met by increasing or decreasing the number of modules. It realizes quick installation and convenient maintenance, while reducing the development requirements of similar products and saving development costs.

[0028] A bypass is connected between the expansion valve 12 and the compressor 6. An electromagnetic valve 10 and a ball valve 11 are installed on the bypass. When the coolant in the secondary side of the plate heat exchanger 5 reaches the minimum liquid supply temperature, at this time, it is not necessary to cool the plate heat exchanger 5. Therefore, the electromagnetic valve 10 and the ball valve 11 are opened, and the refrigerating liquid generated by the expansion valve 12 is directly passed through the circuit into the compressor 6 to avoid cooling the coolant and causing the temperature of the coolant to be lower than the minimum liquid supply temperature.

[0029] A flow sensor 15 is also connected between the liquid storage tank 9 and the coolant pipeline 8, and the flow sensor 15 is used to observe the liquid supply flow rate.

[0030] One side of the liquid supply pump 7 is provided with a circuit communicating with the liquid storage tank 9, and a spring pressure valve 16 is installed on the circuit. By setting the spring pressure valve 16, the pressure of the pipeline is ensured. When the pressure generated by the liquid supply pump 7 is too large, the pressure will cause the spring pressure valve 16 to open, so that the liquid re-enters the liquid storage tank 9 to protect the pipeline.

[0031] Two small float level switches 14 are fixed on the side surface of the liquid storage tank 9, and the small float level switches 14 are used to control the liquid level of the liquid storage tank 9.

[0032] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A modular rail transit power battery cooling device, comprising a housing, characterized in that: A fan, a radiator, a condenser, a compressor, a plate heat exchanger, a liquid supply pump, a liquid storage tank and a coolant pipeline are installed in the shell, and the coolant pipeline is connected to the battery; A radiator is installed in the shell, a fan is arranged on one side of the radiator, the fan is fixed in the shell, one end of the radiator is connected to the coolant pipeline, the radiator is connected to the liquid storage tank through a pipeline, and the other end of the liquid storage tank is connected to the coolant pipeline through a liquid supply pump; The condenser is connected to the compressor, and the other end of the condenser is connected to the primary side of the plate heat exchanger. An expansion valve is also connected between the condenser and the plate heat exchanger. The compressor is also connected to the primary side of the plate heat exchanger. The coolant pipeline is connected to the secondary side of the plate heat exchanger through an electric three-way valve, and the other end of the secondary side of the plate heat exchanger is connected to the liquid storage tank.

2. A modular rail transit power battery cooling device according to claim 1, characterized in that: A bypass is connected between the expansion valve and the compressor, and a solenoid valve and a ball valve are installed on the bypass.

3. A modular rail transit power battery cooling device according to claim 1, characterized in that: A PTC heating device is also fixed in the liquid storage tank.

4. A modular rail transit power battery cooling device according to claim 1, characterized in that: A flow sensor is also connected between the liquid storage tank and the coolant pipeline.

5. A modular rail transit power battery cooling device according to claim 4, characterized in that: A loop connected to the liquid storage tank is arranged on one side of the liquid supply pump, and a spring-loaded valve is installed on the loop.

6. The modular rail transit power battery cooling device according to claim 1, characterized in that: Two small float liquid level switches are fixed on the side of the liquid storage tank.

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