An alternating current liquid cooling device for a power battery of a new energy track locomotive

Abstract

This utility model discloses an AC liquid cooling device for power batteries in new energy rail locomotives, relating to the field of power battery thermal management technology. It aims to solve the problem in existing technologies where thermal management systems directly draw power from the power source, leading to malfunctions that affect power battery performance and even the entire locomotive's operation. The technical solution involves integrating the device into a sheet metal frame, resulting in a compact structure with high integration. It adjusts the operating mode according to the battery's required temperature, improving energy efficiency and facilitating installation and maintenance. The housing contains a battery cooler and an electrical control box, and also includes a water circulation loop and a refrigerant circulation loop. Under the control of the electrical control box, the temperature of the locomotive's power battery is controlled through the water and refrigerant circulation loops. Utilizing a step-down module and a rectifier module in the main control box, it can share AC power with other AC equipment on the locomotive, making it convenient to use, install, and maintain, with a simple and effective control method.

Description

Technical Field

[0001] This utility model relates to the field of power battery thermal management technology, specifically to an AC liquid cooling device for power batteries used in new energy rail locomotives. Background Technology

[0002] With the development of new energy, the field of electric locomotives is also facing the transformation to electrification. High-power batteries will replace traditional internal combustion engines as the main power for vehicle traction. Among them, battery thermal management technology has become one of the main factors affecting battery energy efficiency. If the thermal management system does not effectively cool or heat up the battery, it may lead to thermal runaway or battery range reduction, which may result in battery short circuits, bulging, open flames, and ultimately safety accidents. This highlights that the battery thermal management system is the key to ensuring the continuous safe operation of the entire electric locomotive product.

[0003] Most current power battery thermal management systems use DC high-voltage power supply, with the generator set drawing power directly from the power battery. However, the voltage of power batteries used in locomotives is usually higher than DC 800V, while the high-voltage components of the thermal management system are mostly 600V platforms with a maximum operating voltage of 750V. Therefore, they cannot work properly at 800V, which in turn affects the performance of the power battery and even the operation of the entire locomotive. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide an AC liquid cooling device for power batteries of new energy rail locomotives, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, this utility model discloses an AC liquid cooling device for a power battery of a new energy rail locomotive. The technical solution adopted includes a box body and a box cover, wherein the box body and the box cover form a rectangular shell with an internal hollow structure. It is integrated and installed in a sheet metal frame, which has a compact structure, high integration, and can adjust the operating mode in a timely manner according to the battery's required temperature, thereby improving the energy efficiency ratio and facilitating installation and maintenance.

[0006] The side wall of the enclosure is also provided with heat dissipation holes. The enclosure is equipped with a battery cooler. The enclosure is also provided with a water circulation loop and a refrigerant circulation loop, and both the water circulation loop and the refrigerant circulation loop are connected to the battery cooler.

[0007] The enclosure also contains an electrical control box, which controls the opening and closing of the water circulation loop and the refrigerant circulation loop. Under the control of the electrical control box, the temperature of the locomotive's power battery is controlled through the water circulation loop and the refrigerant circulation loop. Using the step-down module and rectifier module in the main control box, it can share AC power with other AC equipment on the locomotive, making it convenient to use, install, and maintain, and the control method is simple and effective.

[0008] As a preferred embodiment of this invention, the battery cooler is filled with coolant.

[0009] As a preferred embodiment of this utility model, the water circulation loop includes a PTC water heater and a water pump. The battery cooler is connected to the PTC water heater and the water pump via water pipes. The PTC water heater and the water pump are connected to the battery cold plate via an outlet pipe and a return pipe, respectively.

[0010] As a preferred technical solution of this utility model, the outlet pipe and the return pipe are respectively equipped with an outlet water temperature sensor and a return water temperature sensor. By setting a water circulation loop and a refrigerant circulation loop in this device, the temperature can be automatically controlled according to the needs, and the device can switch between multiple working modes such as self-circulation, cooling, and heating.

[0011] As a preferred embodiment of this utility model, the refrigerant circulation loop includes a compressor and a condenser, the battery cooler is connected to the compressor and the condenser in sequence through a refrigerant pipe, and a condensing fan corresponding to the position of the condenser is installed on the housing.

[0012] As a preferred embodiment of this utility model, an electronic expansion valve is provided between the battery cooler and the condenser, and a low-pressure temperature sensor and a high-pressure temperature sensor are respectively provided at the input and output ends of the compressor.

[0013] Compared with the prior art, the beneficial effects of this utility model are: by adopting the step-down module and rectifier module in the main control box, this utility model can share AC power with other AC equipment on the locomotive, which is convenient to use and easy to install and maintain, and the control method is simple and effective; by setting a water circulation loop and a refrigerant circulation loop in this device, the temperature can be set to automatic control according to the needs, and it can switch between multiple working modes such as self-circulation, cooling, and heating.

[0014] This technical solution is integrated into a sheet metal frame, resulting in a compact structure and high integration. It also adjusts the operating mode in real time according to the battery's required temperature, improving the energy efficiency ratio and facilitating installation and maintenance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is an exploded view of the present invention;

[0017] Figure 3 This is a schematic diagram of the internal structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the water circulation loop of this utility model;

[0019] Figure 5 This is a schematic diagram of the refrigerant circulation loop of this utility model;

[0020] Figure 6 This is a diagram of the electrical control system of the electrical control box of this utility model.

[0021] In the diagram: 1. Housing; 2. Cover; 3. Condenser fan; 4. Heat dissipation vents; 5. Condenser; 6. PTC water heater; 7. Battery cooler; 8. Compressor; 9. Water pump; 10. Electrical control box; 11. Outlet water temperature sensor; 12. Return water temperature sensor; 13. Outlet water pipe; 14. Return water pipe; 15. Low-pressure temperature and pressure sensor; 16. High-pressure temperature and pressure sensor; 17. Electronic expansion valve. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0023] like Figures 1 to 6 As shown, this utility model discloses an AC liquid cooling device for a power battery of a new energy rail locomotive. The technical solution adopted is that it includes a box body 1 and a box cover 2, wherein the box body 1 and the box cover 2 form a rectangular shell with an internal hollow structure.

[0024] The side wall of the housing 1 is also provided with heat dissipation holes 4, and the housing 1 is equipped with a battery cooler 7, which is filled with coolant.

[0025] The housing 1 is also equipped with a water circulation loop and a refrigerant circulation loop, and both the water circulation loop and the refrigerant circulation loop are connected to the battery cooler 7.

[0026] The housing 1 is also equipped with an electrical control box 10, which controls the opening and closing of the water circulation loop and the refrigerant circulation loop.

[0027] Under the control of the electrical control box 10, the temperature of the locomotive power battery is controlled through the water circulation loop and the refrigerant circulation loop.

[0028] The water circulation loop includes a PTC water heater 6 and a water pump 9. The battery cooler 7 is connected to the PTC water heater 6 and the water pump 9 via water pipes. The PTC water heater 6 and the water pump 9 are connected to the battery cold plate via an outlet pipe 13 and a return pipe 14, respectively. An outlet water temperature sensor 11 and a return water temperature sensor 12 are respectively installed on the outlet pipe 13 and the return pipe 14.

[0029] The refrigerant circulation loop includes a compressor 8 and a condenser 5. The battery cooler 7 is connected to the compressor 8 and the condenser 5 in sequence through a refrigerant pipe. A condenser fan 3 corresponding to the position of the condenser 5 is installed on the housing 1.

[0030] An electronic expansion valve 17 is provided between the battery cooler 7 and the condenser 5. The input and output ends of the compressor 8 are respectively provided with a low-pressure temperature and pressure sensor 15 and a high-pressure temperature and pressure sensor 16.

[0031] The working principle of this utility model:

[0032] The water circulation loop includes an outlet water temperature sensor 11, a return water temperature sensor 12, a PTC water heater 6, a water pump 9, and a battery cooler 7;

[0033] The refrigerant circulation loop includes a compressor 8, a low-pressure temperature and pressure sensor 15, a high-pressure temperature and pressure sensor 16, a condenser 5, an electronic expansion valve 17, and a battery cooler 7.

[0034] The electrical control system diagram of the entire device is as follows: Figure 6 The electrical control system draws power from the locomotive's AC380V distribution cabinet. After rectification, the AC380V power is converted to DC high voltage. This DC high voltage is input to the frequency converter to control the speed of compressor 8. After being stepped down by a voltage reduction module, the DC high voltage is converted to DC 24V to power low-voltage components such as water pump 9, condenser fan 3, and controller. PTC water heater 6 is powered by AC 380V and is controlled to start and stop via a contactor control module. The system can automatically switch between multiple operating modes, including self-circulation, cooling, and heating, according to the user-set temperature.

[0035] When the battery has no heating or cooling requirements, the system can execute the following: the refrigerant circulation loop does not work and the water circulation loop self-circulates. The PTC water heater 6 does not work, and the water pump 9 runs to circulate the coolant in the battery cooler 7 to achieve the purpose of uniform battery temperature.

[0036] When the battery temperature is high, the system starts the refrigerant circulation loop, the water circulation loop does not work, the compressor 8 is turned on to make the refrigerant circulation loop run, and the water pump 9 runs to make the coolant flow through the battery cooler 7. In the battery cooler 7, the refrigerant in the compressor 8 and the coolant in the battery cooler 7 exchange heat, which lowers the temperature of the coolant and thus achieves the purpose of cooling the battery.

[0037] When the battery temperature is low and heating is required, the system turns on the heating function, the water pump 9 runs to circulate the coolant, and the PTC water heater 6 is turned on to heat the coolant, thereby achieving the purpose of raising the battery temperature.

[0038] To ensure stable and safe system operation, the system is equipped with protective devices such as a low-pressure temperature and pressure sensor 15, a high-pressure temperature and pressure sensor 16, and a liquid level switch. When the control system detects abnormalities in system pressure or liquid level, it can automatically shut down the system and report the abnormality to the vehicle via CAN communication for handling. If the system water pump 9 or the inverter or AC / DC module of the compressor 8 malfunctions, the fault can be detected in real time by the main controller and reported back to the vehicle via CAN communication.

[0039] The system's electronic control system has a reserved CAN communication interface, which can replace the rotary compressor with a scroll compressor with CAN communication control according to the needs of the main vehicle to meet the system's cooling requirements.

[0040] All components of the power battery thermal management system are integrated and installed in a sheet metal frame. The system has a compact structure, high integration, and adjusts its operating mode in a timely manner according to the battery's required temperature, thereby improving the system's energy efficiency ratio and facilitating installation and maintenance.

[0041] The circuits and mechanical connections involved in this utility model are common practices used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments. They are common knowledge.

[0042] Components not described in detail in this article are existing technologies.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An AC liquid cooling device for a power battery in a new energy rail locomotive, characterized in that: It includes a box body (1) and a box cover (2), wherein the box body (1) and the box cover (2) enclose a rectangular shell with an internal hollow interior; The side wall of the box (1) is also provided with heat dissipation holes (4), the box (1) is equipped with a battery cooler (7), the box (1) is also provided with a water circulation loop and a refrigerant circulation loop, and the water circulation loop and the refrigerant circulation loop are both connected to the battery cooler (7). The housing (1) is also equipped with an electrical control box (10), which controls the opening and closing of the water circulation loop and the refrigerant circulation loop.

2. The AC liquid cooling device for a power battery in a new energy rail locomotive according to claim 1, characterized in that: The battery cooler (7) is filled with coolant.

3. The AC liquid cooling device for a power battery in a new energy rail locomotive according to claim 1, characterized in that: The water circulation loop includes a PTC water heater (6) and a water pump (9). The battery cooler (7) is connected to the PTC water heater (6) and the water pump (9) respectively through water pipes. The PTC water heater (6) and the water pump (9) are connected to the battery cold plate respectively through an outlet pipe (13) and a return pipe (14).

4. The AC liquid cooling device for a power battery in a new energy rail locomotive according to claim 3, characterized in that: The outlet pipe (13) and the return pipe (14) are respectively equipped with an outlet water temperature sensor (11) and a return water temperature sensor (12).

5. The AC liquid cooling device for a power battery in a new energy rail locomotive according to claim 1, characterized in that: The refrigerant circulation loop includes a compressor (8) and a condenser (5). The battery cooler (7) is connected to the compressor (8) and the condenser (5) in sequence through a refrigerant pipe. A condenser fan (3) corresponding to the position of the condenser (5) is installed on the housing (1).

6. The AC liquid cooling device for a power battery in a new energy rail locomotive according to claim 5, characterized in that: An electronic expansion valve (17) is provided between the battery cooler (7) and the condenser (5), and a low-pressure temperature and pressure sensor (15) and a high-pressure temperature and pressure sensor (16) are provided at the input and output ends of the compressor (8), respectively.

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