Whole vehicle thermal management integrated system of electric mining excavator

Abstract

The utility model relates to a whole vehicle heat management integrated system of an electric mining excavator. The whole vehicle heat management integrated system comprises a main cooling pipeline, a cab cooling pipeline and a power battery heat dissipation pipeline. The main cooling pipeline is connected with the cab cooling pipeline and the power battery heat dissipation pipeline through a three-way proportional valve, the flowing path and flow of a refrigerant are controlled, and meanwhile the purpose of cooling the power battery and the cab is achieved. Meanwhile, under the ultralow temperature condition, the heat dissipation requirement of the power battery is met through the first heat dissipation device, and normal operation of the power battery is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal management, in particular to a thermal management integrated system for an electric mining excavator. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Due to the working environment, electric mining excavators require a large number of high-capacity power batteries to provide power. During the operation of the power batteries, a large amount of heat will inevitably be generated. If the heat cannot be transferred out in time, it will undoubtedly affect the normal operation of the vehicle. The motors and other heat-generating devices inside the vehicle will also generate a large amount of heat during operation. The motors and other heat-generating devices need to be cooled in time to ensure the normal operation of the vehicle.

[0004] At the same time, when the outside temperature is high, the temperature of the cab must be taken into account to ensure that the vehicle operator is in a relatively comfortable temperature. In addition, in view of the special working environment of the mine, the power battery of the mining excavator still has a large demand for refrigeration in an environment of -20℃ to -40℃, but the battery refrigeration currently used only adopts the TMS structure (electric compressor, condenser, plate heat exchanger structure) Refrigeration only supports use in environments above -20℃, and the battery refrigeration system cannot work normally in ultra-low temperature environments of -20℃ to -40℃. At the same time, the independent layout of multiple systems causes a waste of layout space, high cost of the vehicle thermal management module, and high energy consumption in dual refrigeration mode. Utility Model Content

[0005] The purpose of the utility model is to provide an integrated thermal management system for an electric mining excavator, including a main cooling pipeline, a cab cooling pipeline and a power battery heat dissipation pipeline;

[0006] The main cooling pipeline is provided with an electric compressor, a condenser, a liquid storage tank and a three-way proportional valve connected in series in sequence; the main cooling pipeline is connected with the cab cooling pipeline and the power battery heat dissipation pipeline through the three-way proportional valve; the cab cooling pipeline and the power battery heat dissipation pipeline are connected in parallel;

[0007] The power battery heat dissipation pipeline is provided with a heat exchanger, a three-way ball valve, a first water pump and a power battery connected in series in sequence; the first water pump is also connected to the first water tank; the three-way ball valve is also connected to the first radiator.

[0008] As a further technical solution, the cab cooling pipeline is provided with a first expansion valve and an evaporator connected in series.

[0009] As a further technical solution, the electric mining excavator vehicle thermal management integrated system also includes a motor heat dissipation pipeline, and the motor heat dissipation pipeline is provided with a second water tank, a second water pump and a second radiator connected in series in sequence.

[0010] As a further technical solution, a temperature sensor is further provided on the power battery heat dissipation pipeline, and the temperature sensor is located between the power battery and the first water pump.

[0011] As a further technical solution, the main cooling pipeline, the cab cooling pipeline, and the pipelines between the main cooling pipeline and the power battery heat dissipation pipeline are all refrigerant pipes.

[0012] As a further technical solution, the pipes of the power battery heat dissipation pipeline and the motor heat dissipation pipeline are ordinary water pipes.

[0013] As a further technical solution, a degassing pipe is also connected between the first water tank and the power battery.

[0014] As a further technical solution, a degassing pipe is connected between the second water tank and the second radiator.

[0015] As a further technical solution, the electric mining excavator vehicle thermal management integrated system also includes a cooling fan.

[0016] As a further technical solution, a PTC thermistor is also arranged in the evaporator.

[0017] Beneficial effects of one or more of the above technical solutions:

[0018] (1) By controlling the transmission path of the refrigerant in the main cooling pipeline through a three-way proportional valve, the purpose of cooling a single cab and a single power battery or cooling both the cab and the power battery can be achieved.

[0019] (2) A first radiator is connected to the power battery heat dissipation pipeline through a three-way ball valve. When the TMS structure refrigeration of the mining electric excavator fails in an ultra-low temperature environment, the power battery can still be effectively cooled by utilizing the first radiator.

[0020] (3) The cab cooling pipeline and the power battery heat dissipation pipeline share a set of electric compressors, condensers and cooling fans, which effectively reduces the layout space occupied by the vehicle thermal management system and reduces the cost and energy consumption of the vehicle thermal management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0022] Figure 1 It is a structural schematic diagram of the thermal management integrated system of the utility model.

[0023] In the figure, 1 thermal management controller, 2 motor, 3 other heating devices, 4 second water tank, 5 second water pump, 6 second radiator, 7 condenser, cooling fan, 9 electric compressor, 10 three-way proportional valve, 11 second expansion valve, 12 first expansion valve, 13 heat exchanger, 14 evaporator, 15 power battery, 16 first water pump, 17 first water tank, 18 three-way ball valve, 19 liquid storage tank, 20 first radiator, 21 temperature sensor DETAILED DESCRIPTION

[0024] The following is combined with Figure 1 , describing the specific implementation of this embodiment.

[0025] The present application embodiment provides a thermal management integrated system for an electric mining excavator. Figure 1 , a thermal management integrated system for an electric mining excavator, including a main cooling pipeline, a cab cooling pipeline and a power battery 15 heat dissipation pipeline;

[0026] The operation of valves and water pumps in the system is controlled by the thermal management controller 1, and the heat dissipation and cooling of the power battery 15, the cooling and heating of the cab, and the heat dissipation of the motor 2 and other heating devices 3 are uniformly distributed and executed. Among them, the main cooling pipeline includes an electric compressor 9, a condenser 7 and a liquid storage tank 19 connected in series in sequence; the cab cooling pipeline includes a first expansion valve 12 and an evaporator 14, wherein the evaporator 14 is also provided with a PTC thermistor, and when the cab has a heating demand, PTC is used for air heating; the coolant in the heat dissipation pipeline of the power battery 15 is connected to the cooling pipeline through the heat exchanger 13 to achieve the cooling of the coolant in the heat dissipation pipeline of the power battery 15.

[0027] The main cooling pipeline is connected to the evaporator 14 of the cab cooling pipeline and the heat exchanger 13 of the heat dissipation pipeline of the power battery 15 through the three-way proportional valve 10 and the first expansion valve 12 and the second expansion valve 11 respectively. The main cooling pipeline, the cab cooling pipeline, and the pipelines between the main cooling pipeline and the heat dissipation pipeline of the power battery 15 are all refrigerant pipes. During the circulation refrigeration process, the low-temperature and low-pressure liquid refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the electric compressor 9 in the main cooling pipeline, and is transferred to the condenser 7. The condensed refrigerant passes through the liquid storage tank 19, which stores refrigerant in advance to replenish the refrigerant lost during the circulation process; the condensed refrigerant is transferred to the three-way proportional valve 10. Since the three-way proportional valve 10 is also connected to the cab cooling pipeline and the heat dissipation pipeline of the power battery 15, and the cab cooling pipeline and the heat dissipation pipeline of the power battery 15 are connected in parallel, the single cab and the single power battery 15 can be cooled, and the cab and the power battery 15 can be double-cooled by controlling the opening and closing of the valve. After the refrigeration is completed, the refrigerant flows back to the electric compressor 9 to start the next round of circulation.

[0028] The heat dissipation pipeline of the power battery 15 includes a heat exchanger 13, a three-way ball valve 18, a first water pump 16, a temperature sensor 21 and a power battery 15 connected in sequence, and the first water pump 16 is also connected to the first water tank 17. The three valves of the three-way ball valve 18 are respectively connected to the first radiator 20, the heat exchanger 13 and the first water pump 16. When the outside temperature is above -20°C and the power battery has a heat dissipation demand, the first radiator 20 does not work at this time, and the battery management system inside the power battery 15 sends a cooling request to the thermal management controller 1, and the thermal management controller 1 controls the first water pump 16 to start, so that the coolant flows along the water pipes between the heat exchanger 13, the three-way ball valve 18, the first water pump 16 and the power battery 15, and the temperature of the power battery 15 is reduced by the circulation of the coolant. The coolant exchanges heat with the refrigerant in the cooling pipeline through the heat exchanger 13 to complete the cooling of the coolant. The temperature sensor 21 is used to monitor the temperature of the coolant in real time. A degassing pipe is also provided between the power battery 15 and the first water tank 17 to ensure the normal flow of the coolant and prevent the gas from corroding the pipe during the cooling process.

[0029] The heat dissipation pipeline of the motor 2 includes a second water tank 4, a second water pump 5 and a second radiator 6 which are connected in sequence. When the motor 2 and other heating devices 3 are overheated, the coolant circulation is driven by the second water pump 5, and the second radiator 6 and the cooling fan 8 are used to dissipate the heat of the motor 2 and other heating devices 3.

[0030] Working principle:

[0031] (1) Single cab cooling

[0032] By controlling the opening of the three-way proportional valve 10, the refrigerant in the main cooling pipeline flows to the evaporator 14 through the first expansion valve 12. At this time, the second expansion valve 11 and the heat exchanger 13 do not work. The flow path of the refrigerant is: electric compressor 9-condenser 7-liquid storage tank 19-three-way proportional valve 10-first expansion valve 12-evaporator 14-electric compressor 9.

[0033] (2) When the ambient temperature is higher than -20℃, the single power battery 15 is cooled

[0034] By controlling the opening of the three-way proportional valve 10, the refrigerant in the main cooling pipeline flows to the heat exchanger 13 in the heat dissipation pipeline of the power battery 15 through the second expansion valve 11. At this time, the cooling fan 8 rotates to accelerate the condensation speed of the condenser 7; the evaporator 14 and the first expansion valve 12 do not work, the first radiator 20 in the heat dissipation pipeline of the power battery 15 does not work, and the three-way ball valve 18 is adjusted to close the valve between the three-way ball valve 18 and the first radiator 20. At this time, the flow path of the refrigerant is: electric compressor 9-condenser 7-liquid storage tank 19-three-way proportional valve 10-second expansion valve 11-heat exchanger 13-electric compressor 9.

[0035] (3) When the ambient temperature is below -20°C and the power battery 15 needs cooling

[0036] Due to the ultra-low temperature, the battery refrigeration system may not work properly. At this time, by adjusting the three-way ball valve 18, the pipeline valve connected to the first radiator 20 is opened, and the coolant circulation is driven only by the first water pump 16. The circulation path is: first radiator 20-three-way ball valve 18-first water pump 16-power battery 15-first radiator 20.

[0037] (4) When the cab and the power battery 15 have dual cooling requirements

[0038] According to the cooling requirements of the cab and the power battery 15, the opening ratio of the three-way proportional valve 10 is adjusted to distribute the amount of refrigerant flowing through the heat exchanger 13 and the evaporator 14. The refrigerant flow path is divided into two paths. The cab cooling path is: electric compressor 9-condenser 7-liquid storage tank 19-three-way proportional valve 10-first expansion valve 12-evaporator 14-electric compressor 9, and the power battery refrigerant cooling path is: electric compressor 9-condenser 7-liquid storage tank 19-three-way proportional valve 10-second expansion valve 11-heat exchanger 13-electric compressor 9. At this time, the first radiator 20 in the heat dissipation pipeline of the power battery 15 does not work, and the three-way ball valve 18 is adjusted to close the valve between the three-way ball valve 18 and the first radiator 20. The coolant in the heat dissipation pipeline of the power battery 15 circulates under the drive of the first water pump 16 to reduce the temperature of the power battery 15, and the coolant is cooled through the heat exchanger 13.

[0039] (5) When the cab needs to be heated, a thermistor PTC is installed in the evaporator 14, and the PTC is used for air heating. When the power battery 15 needs to be heated, the thermistor PTC of the power battery 15 is used for heating, which is controlled autonomously by the battery management system of the power battery 15 and is not controlled by the thermal management controller 1.

[0040] (6) When the motor 2 and other heat generating devices 3 need to dissipate heat

[0041] The second radiator 6 and the second water pump 5 are used to dissipate heat for the motor 2 and other heating devices 3, and the refrigerant flow path is: second radiator 6-second water pump 5-motor 2-other heating devices 3-second radiator 6. At this time, the cooling fan 8 is working, and the working status of other components is not related to the cooling pipelines of the motor 2 and other heating devices 3.

[0042] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. An electric mining excavator vehicle thermal management integrated system, characterized in that: Including main cooling pipeline, cab cooling pipeline and power battery cooling pipeline; The main cooling pipeline is provided with an electric compressor, a condenser, a liquid storage tank and a three-way proportional valve connected in series in sequence; the main cooling pipeline is connected with the cab cooling pipeline and the power battery heat dissipation pipeline through the three-way proportional valve; the cab cooling pipeline and the power battery heat dissipation pipeline are connected in parallel; The power battery heat dissipation pipeline is provided with a heat exchanger, a three-way ball valve, a first water pump and a power battery connected in series in sequence; the first water pump is also connected to the first water tank; the three-way ball valve is also connected to the first radiator.

2. The electric mining excavator vehicle thermal management integrated system according to claim 1, characterized in that: The cab cooling pipeline is provided with a first expansion valve and an evaporation tank which are connected in series in sequence.

3. The electric mining excavator vehicle thermal management integrated system according to claim 1, characterized in that: The electric mining excavator vehicle thermal management integrated system also includes a motor heat dissipation pipeline, and the motor heat dissipation pipeline is provided with a second water tank, a second water pump and a second radiator connected in series in sequence.

4. The electric mining excavator vehicle thermal management integrated system according to claim 1, characterized in that: The power battery heat dissipation pipeline is also provided with a temperature sensor, and the temperature sensor is located between the power battery and the first water pump.

5. The electric mining excavator vehicle thermal management integrated system according to claim 1, characterized in that: The main cooling pipeline, the cab cooling pipeline, and the pipelines between the main cooling pipeline and the power battery heat dissipation pipeline are all refrigerant pipes.

6. The electric mining excavator vehicle thermal management integrated system according to claim 1 or 3, characterized in that: The pipeline between the power battery heat dissipation pipeline and the motor heat dissipation pipeline is an ordinary water pipe.

7. The electric mining excavator vehicle thermal management integrated system according to claim 1, characterized in that: A degassing pipe is also connected between the first water tank and the power battery.

8. The electric mining excavator vehicle thermal management integrated system as claimed in claim 3, characterized in that: A degassing pipe is connected between the second water tank and the second radiator.

9. The electric mining excavator vehicle thermal management integrated system according to claim 1, characterized in that: The electric mining excavator vehicle thermal management integrated system also includes a cooling fan.

10. The electric mining excavator vehicle thermal management integrated system according to claim 2, characterized in that: A PTC thermistor is also arranged in the evaporation box.

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