CN115848098A - Pure electric drive excavator and whole vehicle thermal management system thereof - Google Patents
Pure electric drive excavator and whole vehicle thermal management system thereof Download PDFInfo
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- CN115848098A CN115848098A CN202310111665.9A CN202310111665A CN115848098A CN 115848098 A CN115848098 A CN 115848098A CN 202310111665 A CN202310111665 A CN 202310111665A CN 115848098 A CN115848098 A CN 115848098A
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- 239000010720 hydraulic oil Substances 0.000 claims abstract description 94
- 239000002918 waste heat Substances 0.000 claims abstract description 19
- 238000011084 recovery Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 187
- 239000003507 refrigerant Substances 0.000 claims description 59
- 239000003921 oil Substances 0.000 claims description 32
- 239000007788 liquid Substances 0.000 claims description 29
- 238000004378 air conditioning Methods 0.000 claims description 27
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 8
- 238000001704 evaporation Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 4
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 239000000498 cooling water Substances 0.000 description 22
- 238000010438 heat treatment Methods 0.000 description 22
- 230000017525 heat dissipation Effects 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000010729 system oil Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000002207 thermal evaporation Methods 0.000 description 1
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Abstract
The invention provides a pure electric drive excavator and a whole vehicle thermal management system thereof, which comprise a whole vehicle controller, a control assembly, an electric drive thermal management assembly, a hydraulic oil thermal management assembly and a temperature sensing assembly, wherein the control assembly is used for controlling the electric drive thermal management assembly to work; the whole vehicle controller is connected with the control assembly, the temperature sensing assembly, the electric driving thermal management assembly and the hydraulic oil thermal management assembly; the temperature sensing assembly is configured to acquire the temperatures of the battery water channels of the electric drive heat management assembly, the hydraulic oil heat management assembly and the pure electric drive excavator; the vehicle control unit is configured to control the electric driving heat management assembly and the hydraulic oil heat management assembly to provide heat for a cab and a power battery pack of the pure electric driving excavator according to a mode operation instruction sent by the operation assembly and data collected by the temperature sensing assembly, so that waste heat recovery and reasonable redistribution of an electric driving system and a hydraulic system of the pure electric driving excavator are realized. In addition, the existing finished automobile heat management system has poor effects of recovering and reasonably redistributing the waste heat of an electric drive system and a hydraulic system of pure electric engineering machinery.
Description
Technical Field
The invention relates to the field of thermal management systems, in particular to a pure electric drive excavator and a finished automobile thermal management system thereof.
Background
At present, pure electric engineering machinery is still in a starting stage relative to a pure electric vehicle, various matched technologies are not mature enough, and particularly a thermal management system is in a blank stage and is deficient in technology. Because the traditional pure electric engineering mechanical hydraulic system has the typical characteristics of large heat productivity, the heat productivity of a motor is far smaller than that of a diesel engine, less available waste heat, great influence of temperature on the capacity and safety of a battery, mutual independence of all heat dissipation modules and the like; however, the existing finished automobile thermal management system on the market has the problems of low mechanical energy utilization rate of the pure electric engineering, poor energy-saving and emission-reducing effects and poor mechanical endurance due to the fact that the existing electric drive system and the existing hydraulic system of the pure electric engineering are poor in waste heat recovery and reasonable redistribution effects.
In view of this, the present application is presented.
Disclosure of Invention
In view of the above, the invention aims to provide a pure electric excavator and a complete vehicle thermal management system thereof, which can effectively solve the problems that the complete vehicle thermal management system in the prior art has poor effects on waste heat recovery and reasonable redistribution of electric driving and hydraulic systems of pure electric engineering machinery, so that the utilization rate of energy is low, energy is saved, emission is reduced, and the cruising ability of the pure electric engineering machinery is poor.
The invention discloses a whole vehicle thermal management system of a pure electric drive excavator, which comprises: the system comprises a vehicle control unit, a control assembly, an electric driving heat management assembly, a hydraulic oil heat management assembly and a temperature sensing assembly;
the input end of the whole vehicle controller is connected with the control assembly, the input end of the whole vehicle controller is electrically connected with the output end of the temperature sensing assembly, the output end of the whole vehicle controller is electrically connected with the control end of the electric driving heat management assembly and the control end of the hydraulic oil heat management assembly, and the electric driving heat management assembly is connected with the hydraulic oil heat management assembly through a pipeline;
wherein the temperature sensing component is configured to collect temperatures of battery water channels of the electric drive thermal management component, the hydraulic oil thermal management component, and the pure electric drive excavator;
the vehicle control unit is configured to control the electric driving thermal management assembly and the hydraulic oil thermal management assembly to provide heat for a cab and a power battery pack of the pure electric driving excavator according to a mode operation instruction sent by the control assembly and data collected by the temperature sensing assembly, so that electric driving of the pure electric driving excavator and waste heat recovery and reasonable redistribution of a hydraulic system are realized.
Preferably, the electric-drive heat management assembly comprises a first water tank, a first water pump, a motor controller, a motor, a first tee joint, a thirteenth tee joint, a fourteenth tee joint, a fifteenth tee joint, an electric control ATS, a third stop valve, a fourth stop valve, a fifth stop valve and a four-way joint;
the water outlet of the first water tank is connected with the second end of a fifteenth tee joint, the third end of the fifteenth tee joint is connected with the water inlet of the first water pump, the water outlet of the first water pump is connected with the water inlet of the motor controller, the water outlet of the motor controller is connected with the water inlet of the motor, the water outlet of the motor is connected with the first end of the first tee joint, the third end of the first tee joint is connected with the first end of the four-way joint, the first end of the fifteenth tee joint is connected with the third end of the fourteenth tee joint, the first end of the fourteenth tee joint is connected with the water outlet of the electric control ATS, the water inlet of the electric control ATS is connected with the first end of the thirteenth tee joint, the third end of the thirteenth tee joint is connected with the water outlet of a third stop valve, the water inlet of the third stop valve is connected with the fourth end of the four-way joint, the water outlet of the fourth stop valve is connected with the water inlet of the electric control stop valve, the motor controller, the electric control unit, the hydraulic oil pump, the water inlet of the electric control stop valve and the electric control unit.
Preferably, the hydraulic oil thermal management assembly comprises a hydraulic control module, a hydraulic oil ATS, a liquid-liquid heat exchanger, a hydraulic oil tank, a second tee joint and a third tee joint;
the electric control ATS is welded with the hydraulic oil ATS, an oil outlet of the hydraulic control module is connected with an oil inlet of the hydraulic oil ATS, an oil outlet of the hydraulic oil ATS is connected with an oil inlet of the liquid-liquid heat exchanger, an oil outlet of the liquid-liquid heat exchanger is connected with an oil inlet of the hydraulic oil tank, a water inlet of the liquid-liquid heat exchanger is connected with the electric driving heat management assembly, a water outlet of the liquid-liquid heat exchanger is connected with a second end of the second tee joint, a third end of the second tee joint is connected with the electric driving heat management assembly, a first end of the second tee joint is connected with a first end of the third tee joint, and the hydraulic oil ATS, the hydraulic oil tank and the whole vehicle controller are electrically connected.
Preferably, the vehicle control system further comprises a cab air conditioning assembly, the output end of the vehicle control unit is electrically connected with the control end of the cab air conditioning assembly, and the cab air conditioning assembly is connected with the electric driving heat management assembly and the hydraulic oil heat management assembly through pipelines.
Preferably, the cab air conditioning assembly comprises a first stop valve, a second stop valve, an eleventh tee joint, a twelfth tee joint, an eighteenth tee joint, a compressor, a first condenser, a second condenser, a condensing fan, a drying bottle, an evaporating fan, an evaporator, a first expansion valve, a warm air core body and a first PTC heater;
the water outlet of the second stop valve is connected with the electrically-driven thermal management assembly, the water inlet of the second stop valve is connected with the first end of the twelfth tee joint, the third end of the twelfth tee joint is connected with the water outlet of the warm air core, the second end of the twelfth tee joint is connected with the water inlet of the eleventh stop valve, the refrigerant inlet of the compressor is connected with the first end of the eleventh tee joint, the refrigerant outlet of the compressor is connected with the refrigerant inlet of the first condenser and the refrigerant inlet of the second condenser, the third end of the eleventh tee joint is connected with the refrigerant inlet of the evaporator, the refrigerant inlet of the first expansion valve is connected with the refrigerant outlet of the first stop valve, the refrigerant inlet of the first stop valve is connected with the second end of the eighteenth tee joint, the third end of the eighteenth tee joint is connected with the refrigerant outlet of the first condenser and the refrigerant outlet of the second condenser, and the first stop valve, the second stop valve, the eleventh stop valve, the compressor, the condensation fan, the evaporator, the warm air heater and the first electric heater controller are connected with the integral unit.
Preferably, the vehicle-mounted power battery pack heat management system further comprises a power battery pack heat management assembly, the output end of the vehicle control unit is electrically connected with the control end of the power battery pack heat management assembly, the loop of the cab air conditioner assembly is connected with the loop of the power battery pack heat management assembly in parallel, and the power battery pack heat management assembly is connected with the electric heat management assembly and the hydraulic oil heat management assembly through pipelines.
Preferably, the power battery pack heat management assembly comprises a fourth tee joint, a fifth tee joint, a sixth tee joint, a seventh tee joint, an eighth tee joint, a ninth tee joint, a tenth tee joint, a nineteenth tee joint, a sixth stop valve, a seventh stop valve, an eighth stop valve, a ninth stop valve, a tenth stop valve, a second water tank, a second water pump, a second expansion valve, a plate evaporator, a power battery pack and a second PTC heater;
wherein, the first end of the nineteenth tee is connected with the cab air-conditioning component, the third end of the nineteenth tee is connected with the water outlet of the seventh stop valve, the water inlet of the seventh stop valve is connected with the first end of the fourth tee, the third end of the fourth tee is connected with the water outlet of the hydraulic oil heat management component, the second end of the fourth tee is connected with the water inlet of the sixth stop valve, the water outlet of the sixth stop valve is connected with the first end of the fifth tee, the second end of the fifth tee is connected with the water outlet of the eighth stop valve, the water inlet of the eighth stop valve is connected with the water outlet of the second water pump, the water inlet of the second water pump is connected with the third end of the ninth tee, and the second end of the ninth tee is connected with the water outlet of the second water tank, the first end of the ninth tee is connected with the third end of the tenth tee, the first end of the tenth tee is connected with the water outlet of the cab air conditioning assembly, the second end of the tenth tee is connected with the water outlet of the ninth stop valve, the water inlet of the ninth stop valve is connected with the second end of the eighth tee, the third end of the eighth tee is connected with the water inlet of the tenth stop valve, the water outlet of the tenth stop valve is connected with the second end of the nineteenth tee, the first end of the eighth tee is connected with the water outlet of the plate evaporator, the refrigerant inlet of the plate evaporator is connected with the refrigerant outlet of the second expansion valve, the refrigerant outlet of the plate evaporator is connected with the second end of the eleventh tee, and the refrigerant inlet of the second expansion valve is connected with the first end of the eighteenth tee, the water inlet of the plate evaporator is connected with the first end of the seventh tee joint, the third end of the seventh tee joint is connected with the water outlet of the power battery pack, the water inlet of the power battery pack is connected with the first end of the sixth tee joint, the third end of the sixth tee joint is connected with the water outlet of the second PTC heater, the water inlet of the second PTC heater is connected with the third end of the fifth tee joint, and the sixth stop valve, the seventh stop valve, the eighth stop valve, the ninth stop valve, the tenth stop valve, the second water tank, the second water pump, the second expansion valve, the power battery pack, the second PTC heater and the whole vehicle controller are electrically connected.
Preferably, the temperature sensing assembly comprises a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, and a sixth temperature sensor;
the first temperature sensor is connected with a second end of the first tee joint, the second temperature sensor is connected with an oil inlet of the liquid-liquid heat exchanger, the third temperature sensor is connected with a second end of the third tee joint, the fourth temperature sensor is connected with a second end of the sixth tee joint, the fifth temperature sensor is connected with a second end of the seventh tee joint, the sixth temperature sensor is connected with a second end of the fourteenth tee joint, and the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the fifth temperature sensor and the sixth temperature sensor are electrically connected with the whole vehicle controller.
Preferably, the first temperature sensor, the third temperature sensor, the fourth temperature sensor, the fifth temperature sensor, the sixth temperature sensor and the second temperature sensor are PT100 platinum thermistor temperature sensors.
The invention also discloses a pure electric drive excavator, which comprises an excavator body and the whole pure electric drive excavator heat management system, wherein the whole pure electric drive excavator heat management system is configured in the excavator body.
In summary, the pure electric excavator and the whole vehicle thermal management system thereof provided by the embodiment provide a scheme that loops of the cab air conditioning component and the power battery pack thermal management component are connected in parallel, so that the compressor is multipurpose, the temperature of the power battery is controlled, and the whole vehicle cost can be reduced. Meanwhile, the whole vehicle thermal management system of the pure electric drive excavator is combined with the characteristic of large heat productivity of the pure electric drive excavator, waste heat utilization of an electric drive system and hydraulic oil is fully realized, considerable help is provided for heating of a cab and heating of a power battery pack, the utilization rate of energy is improved, and the purposes of saving energy, reducing emission and improving the cruising ability of the excavator are realized; therefore, the problems that the pure electric engineering machinery energy utilization rate is low, the energy-saving emission-reducing effect is poor, and the mechanical endurance is poor due to the fact that the waste heat recovery and reasonable redistribution effect of an electric driving system and a hydraulic system of the pure electric engineering machinery on the market are poor in the whole vehicle heat management system in the prior art are solved.
Drawings
Fig. 1 is a schematic structural diagram of a complete vehicle thermal management system of a pure electric drive excavator provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, are within the scope of protection of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
Referring to fig. 1, a first embodiment of the present invention provides a thermal management system for a whole pure electric excavator, including: the system comprises a vehicle control unit, a control assembly, an electric drive thermal management assembly 1, a hydraulic oil thermal management assembly 2 and a temperature sensing assembly;
the input end of the whole vehicle controller is connected with the operating assembly, the input end of the whole vehicle controller is electrically connected with the output end of the temperature sensing assembly, the output end of the whole vehicle controller is electrically connected with the control end of the electric driving heat management assembly 1 and the control end of the hydraulic oil heat management assembly 2, and the electric driving heat management assembly 1 is connected with the hydraulic oil heat management assembly 2 through a pipeline;
the temperature sensing assembly is configured to collect the temperatures of the electric drive heat management assembly 1, the hydraulic oil heat management assembly 2 and a battery water channel of the pure electric drive excavator;
the vehicle control unit is configured to control the electric driving thermal management assembly 1 and the hydraulic oil thermal management assembly 2 to provide heat for a cab and a power battery pack of the pure electric driving excavator according to a mode operation instruction sent by the operation assembly and data collected by the temperature sensing assembly, so that electric driving of the pure electric driving excavator and waste heat recovery and reasonable redistribution of a hydraulic system are achieved.
At present, pure electric engineering machinery is still in a starting stage relative to a pure electric vehicle, various matched technologies are not mature enough, and particularly a thermal management system is in a blank stage and is deficient in technology. Because the traditional pure electric engineering mechanical hydraulic system has the typical characteristics of large heat productivity, the heat productivity of a motor is far smaller than that of a diesel engine, less available waste heat, great influence of temperature on the capacity and safety of a battery, mutual independence of all heat dissipation modules and the like; however, the existing finished automobile thermal management system on the market has the problems of low mechanical energy utilization rate of the pure electric engineering, poor energy-saving and emission-reducing effects and poor mechanical endurance due to the fact that the existing electric drive system and the existing hydraulic system of the pure electric engineering are poor in waste heat recovery and reasonable redistribution effects.
Specifically, in this embodiment, according to a command sent by a driver to the entire vehicle thermal management system of the pure electric excavator, that is, according to different combinations of the mode operation command sent by the operating component and the thermal management mode, the controller may, according to a state of the cab air conditioning system, for example: cooling, heating, shutdown, and status of the power battery, for example: refrigerating, heating, self-circulation and shutdown, and matching heat management modes; the working conditions of the whole vehicle heat management system of the pure electric drive excavator and the actual working conditions of the whole vehicle are well matched by controlling the working states of components such as a stop valve, an expansion valve, an electronic water pump, an electronic fan, a PTC water heating heater, a PTC heater, a compressor, an evaporation fan and a condensing fan, and the like, and the pure electric drive excavator has good application performance in a non-charging mode and a charging mode. Wherein, the manipulation component can be a manipulation panel or a touch screen; it should be noted that, in other embodiments, other types of manipulating assemblies may be used, which are not specifically limited herein, but are within the scope of the present invention.
In this embodiment, the whole vehicle thermal management system of the pure electric drive excavator can ensure that the temperature of important components of the whole vehicle thermal management system is always in the optimal working temperature range and is in the optimal working temperature point for a long time in the operation process of the excavator, and simultaneously, the waste heat recovery and reasonable redistribution of an electric drive system and a hydraulic system are realized, thereby providing very considerable help for heating of a cab and heating of a power battery pack, fully improving the utilization rate of energy, and realizing the purposes of saving energy, reducing emission and improving the cruising ability of the excavator.
In one possible embodiment of the invention, the vehicle further comprises a cab air conditioning assembly 3, wherein the output end of the vehicle control unit is electrically connected with the control end of the cab air conditioning assembly 3, and the cab air conditioning assembly is in pipeline connection with the electric driving heat management assembly 1 and the hydraulic oil heat management assembly 2.
In one possible embodiment of the invention, the vehicle-mounted controller further comprises a power battery pack thermal management assembly 4, the output end of the vehicle-mounted controller is electrically connected with the control end of the power battery pack thermal management assembly 4, the loop of the cab air conditioning assembly 3 is connected with the loop of the power battery pack thermal management assembly 4 in parallel through a pipeline, and the power battery pack thermal management assembly 4 is connected with the electric drive thermal management assembly 1 and the hydraulic oil thermal management assembly 2 through pipelines.
In one possible embodiment of the present invention, the electric drive thermal management assembly 1 comprises a first water tank 11, a first water pump 12, a motor controller 13, a motor 14, a first tee 15, a thirteenth tee 16, a fourteenth tee 17, a fifteenth tee 18, an electronically controlled ATS19, a third stop valve 110, a fourth stop valve 111, a fifth stop valve 112, a four-way valve 113;
a water outlet of the first water tank 11 is connected to a second end of a fifteenth three-way valve 18, a third end of the fifteenth three-way valve 18 is connected to a water inlet of the first water pump 12, a water outlet of the first water pump 12 is connected to a water inlet of the motor controller 13, a water outlet of the motor controller 13 is connected to a water inlet of the motor 14, a water outlet of the motor 14 is connected to a first end of the first three-way valve 15, a third end of the first three-way valve 15 is connected to a first end of the four-way valve 113, a first end of the fifteenth three-way valve 18 is connected to a third end of the fourteenth three-way valve 17, a first end of the fourteenth three-way valve 17 is connected to a water outlet of the electrically controlled ATS19, a water inlet of the electrically controlled ATS19 is connected to a first end of the thirteenth three-way valve 16, a third end of the thirteenth three-way valve 16 is connected to a water outlet of a third stop valve 110, a water inlet of the third stop valve 110 is connected to a fourth end of the four-way valve 113, a water outlet of the fourth water tank 111 is connected to a water inlet 112 of the electrically controlled stop valve 112, a water pump 112, a water inlet of the electric hydraulic oil pump controller 112, a fifth stop valve 112 and a hydraulic oil pump 12, a hydraulic oil pump controller 112.
Specifically, in the present embodiment, a liquid level sensor is configured in the first water tank 11, wherein the liquid level sensor is electrically connected with the vehicle control unit; the cab air conditioning component 3 comprises three modes of heating, refrigerating and shutdown, and the power battery pack heat management component 4 comprises four modes of heating, refrigerating, self-circulation and shutdown; the air conditioning component 3 of the cab is connected with the loop of the power battery pack heat management component 4 in parallel through a pipeline, the flow direction of a refrigerant is adjusted through the combination of the opening and closing states of the stop valve and the expansion valve, and the arbitrary switching of a single cab refrigeration mode, a single power battery pack refrigeration mode, a cab and power battery pack double refrigeration mode and the like is realized. The stop valves used in the whole vehicle thermal management system of the pure electric drive excavator are all electromagnetic stop valves, the whole vehicle controller sends out control signals to control the states of the stop valves, and the stop valves are only in a fully-open state and a fully-closed state. The first water pump 12 may be an electronic water pump with a PWM speed adjustable.
In this embodiment, in the heating working condition of the cab, the first water pump 12 drives the cooling water to take away heat from the motor controller 13 and the motor 14, and then if the indication number of the second temperature sensor is greater than the indication number of the first temperature sensor, that is, the oil outlet temperature of the hydraulic oil is higher than the water outlet temperature of the motor, the high-temperature cooling water enters the liquid-liquid heat exchanger through the opened fourth stop valve 111 to exchange heat with the higher-temperature hydraulic oil, so as to obtain the higher-temperature cooling water, and then enters the warm air core body, and blows air to the warm air core body under the action of the evaporation fan, and the air enters the cab through the air duct after absorbing heat, and meanwhile, the PTC heater is used as secondary heating to supplement when the heat is insufficient, so as to achieve the purpose of heating the cab.
In the present embodiment, the demand of the electric drive thermal management assembly 1 is refrigeration, because the electric drive thermal management assembly 1 is heated quickly, and self-heating enables the electric drive thermal management assembly 1 to reach a higher temperature in a shorter time. The first water pump 12 drives the cooling water to take heat away from the motor controller 13 and the motor 14, a path is selected according to the actual working condition of the whole vehicle after passing through the four-way joint 113, when the cab and the power battery pack need heat, the fourth stop valve 111 is preferentially opened, the high-temperature cooling water enters the liquid-liquid heat exchanger through the opened fourth stop valve 111 to exchange heat with the higher-temperature hydraulic oil, so as to obtain the higher-temperature cooling water, but since the cooling water entering the battery water channel has a preset maximum temperature limit, such as 65 ℃, it is necessary to determine whether to close the fourth stop valve 111 or not according to the indication of the third temperature sensor, open the fifth stop valve 112, so as to solely utilize the waste heat of the electric drive heat management assembly, and if the indication of the third temperature sensor still exceeds the preset maximum temperature, the fifth stop valve 112 should be closed, the third stop valve 110 should be opened, so that the heat management assembly 1 performs self-circulation, that is, that the first water pump 12 drives the cooling water to enter the electric control 13 and the motor 14, and then enters the electric drive cooling water to enter the cooling water circulation system 19 to perform cooling.
In one possible embodiment of the present invention, the hydraulic oil thermal management assembly 2 includes a hydraulic control module 21, a hydraulic oil ATS22, a liquid-liquid heat exchanger 23, a hydraulic oil tank 24, a second tee joint 25, and a third tee joint 26;
the electric control ATS19 is welded with the hydraulic oil ATS22, an oil outlet of the hydraulic control module 21 is connected with an oil inlet of the hydraulic oil ATS22, an oil outlet of the hydraulic oil ATS22 is connected with an oil inlet of the liquid-liquid heat exchanger 23, an oil outlet of the liquid-liquid heat exchanger 23 is connected with an oil inlet of the hydraulic oil tank 24, a water inlet of the liquid-liquid heat exchanger 23 is connected with the electric driving heat management assembly 1, a water outlet of the liquid-liquid heat exchanger 23 is connected with a second end of the second tee 25, a third end of the second tee 25 is connected with the electric driving heat management assembly 1, a first end of the second tee 25 is connected with a first end of the third tee 26, and the hydraulic oil ATS22 and the hydraulic oil tank 24 are electrically connected with the whole vehicle controller.
Specifically, in the present embodiment, a fuel level sensor is disposed in the hydraulic oil tank 24, wherein the fuel level sensor is electrically connected to the vehicle control unit; in the heating working condition of the power battery pack, the first water pump 12 drives the cooling water to take heat away from the motor controller 13 and the motor 14, if the indication number of the second temperature sensor is greater than that of the first temperature sensor, that is, the oil outlet temperature of the hydraulic oil is higher than the motor water outlet temperature, the high-temperature cooling water enters the liquid-liquid heat exchanger 23 by opening the fourth stop valve 111 to exchange heat with the higher-temperature hydraulic oil, so as to obtain higher-temperature cooling water, since the maximum temperature of the cooling water entering the battery water channel is 65 ℃, if the indication number of the third temperature sensor is greater than 65 ℃, the fourth stop valve 111 should be closed, the fifth stop valve 112 is opened, that is, the battery heating is supported by only the waste heat of the electric drive heat management assembly 1, if the indication number of the third temperature sensor still exceeds 65 ℃, the fifth stop valve 112 is closed, the third stop valve 110 is opened, and then the electric drive heat management assembly 1 performs self-circulation, that the first water pump 12 drives the cooling water to enter the motor controller 13 and the motor 14, and then enters the electric drive heat-cooling water circulation system 19 to perform cooling. The heat of the battery is provided by the PTC water heating heater. It should be noted here that when both the power battery pack and the cab are in the heating condition, the cooling water absorbing the residual heat of the electric drive heat management assembly 1 and the hydraulic oil enters the water channel of the power battery pack through the opened sixth stop valve 49 to provide heat for the power battery pack, and then enters the warm air core body through the opened tenth stop valve 413 and the opened eleventh stop valve 48 to provide heat for the cab.
In this embodiment, the requirement of the hydraulic oil thermal management assembly 2 is refrigeration, because the entire vehicle generally undergoes rapid temperature rise to the hydraulic oil in a low-temperature environment immediately after the vehicle is driven by means of throttling or overflowing of a hydraulic system, the entire vehicle thermal management system of the pure electric excavator does not temporarily consider heating the hydraulic oil by means of adding a heater and the like. The excavator executing mechanism comprises a movable arm oil cylinder, an arm oil cylinder, a bucket oil cylinder, a rotary motor and the like, hydraulic oil can absorb a large amount of heat in the working process of the actuator, high-temperature hydraulic oil needs to be subjected to heat dissipation through the hydraulic oil ATS22, but the hydraulic oil after heat dissipation still has high temperature, so that the waste heat of the hydraulic oil can be fully utilized through the liquid-liquid heat exchanger 23, the temperature of the hydraulic oil passing through the liquid-liquid heat exchanger 23 is reduced again, and finally the hydraulic oil enters the hydraulic oil tank 24, the hydraulic oil tank 24 can also provide help for heat dissipation of the hydraulic oil to a certain extent, the hydraulic oil pump pumps oil from the oil tank again to enter the multi-way valve, the multi-way valve distributes the hydraulic oil according to an action signal sent by the electric control handle, and then the hydraulic oil enters the corresponding actuator, so that the heat dissipation circulation of the hydraulic oil is formed.
In this embodiment, the whole vehicle thermal management system of the pure electric drive excavator utilizes the waste heat of the electric drive thermal management assembly, and the liquid-liquid heat exchanger 23 is configured to realize the sufficient heat exchange of the high-temperature hydraulic oil of the outlet cooling water and the oil return of the hydraulic system of the electric drive thermal management assembly 1, so that the waste heat of the electric drive system and the hydraulic oil system is fully utilized, and considerable help is provided for the heating of a cab and the heating of a power battery pack. The electric control ATS19 and the hydraulic oil ATS22 are respectively a water radiator and an oil radiator which are welded together, and meanwhile, two electronic fans with adjustable PWM rotating speeds are correspondingly assembled with the water radiator and the oil radiator respectively, so that one radiator corresponds to one fan, and the good matching of the heat dissipation capacity and the heat productivity is realized.
In one possible embodiment of the present invention, the cab air conditioning assembly 3 includes a first cut-off valve 31, a second cut-off valve 32, an eleventh cut-off valve 33, an eleventh tee 34, a twelfth tee 35, an eighteenth tee 36, a compressor 37, a first condenser 38, a second condenser 39, a condensing fan 310, a drying bottle 311, an evaporation fan 312, an evaporator 313, a first expansion valve 314, a warm air core 315, a first PTC heater 316;
wherein a water outlet of the second stop valve 32 is connected to the electric drive thermal management assembly 1, a water inlet of the second stop valve 32 is connected to a first end of the twelfth tee 35, a third end of the twelfth tee 35 is connected to a water outlet of the heater core 315, a second end of the twelfth tee 35 is connected to a water inlet of the eleventh stop valve 33, a refrigerant inlet of the compressor 37 is connected to a first end of the eleventh tee 34, a refrigerant outlet of the compressor 37 is connected to a refrigerant inlet of the first condenser 38 and a refrigerant inlet of the second condenser 39, a third end of the eleventh tee 34 is connected to a refrigerant inlet of the evaporator 313, a refrigerant inlet of the first expansion valve 314 is connected to a refrigerant outlet of the first stop valve 31, a refrigerant inlet of the first stop valve 31 is connected to a second end of the eighteenth tee 36, a third end of the eighteenth tee 36 is connected to a refrigerant outlet of the first condenser 38 and a refrigerant outlet of the second condenser 39, and the first stop valve 31, the eleventh stop valve 32, the eleventh stop valve 33, the PTC heater 37, the condenser core 316 and the evaporator core 316 are connected to the first stop valve 31, the heater controller 310 and the evaporator core 316.
Specifically, in the present embodiment, two temperature sensors are configured in the evaporator 313, one is used for acquiring the surface temperature of the evaporator 313 and is called a defrosting temperature sensor, and the other is used for measuring the temperature of the air at the inlet of the evaporation fan and is called a return air temperature sensor, wherein the two temperature sensors are electrically connected with the vehicle control unit; it should be noted that the first stop valve 31 is different from other stop valves in the entire vehicle thermal management system of the pure electric excavator, the first stop valve 31 is a dedicated refrigerant stop valve in an air-conditioning pipeline, and the other stop valves in the entire vehicle thermal management system of the pure electric excavator are all water stop valves.
In this embodiment, in the cooling operation of the cab, the refrigerant enters the compressor 37 and then becomes a high-temperature and high-pressure gas, then enters the first condenser 38 and is condensed into a low-temperature and high-pressure liquid, and along with releasing a large amount of heat into the air, the condensing fan 310 plays a role of enhancing heat exchange, then the drying bottle 311 is used for absorbing moisture and filtering impurities, the refrigerant passes through the first stop valve 31 and the first expansion valve 314 and then becomes a low-temperature and low-pressure liquid under the action of the first expansion valve 314, the gas with a higher temperature is driven by the evaporating fan 312 to be blown to the evaporator 313, so that the refrigerant in the evaporator 313 is evaporated under heat, thereby absorbing the heat of the gas, and finally the gas with a lower temperature enters the cab through the air duct to achieve the purpose of cooling the cab.
In this embodiment, the first PTC heater 316 is used to quickly provide the necessary heat to the driver in the cab in the extremely low temperature environment, and the first PTC heater 316 also serves to supplement the heat when the electric driving and the residual heat of the hydraulic oil are insufficient. The second condenser 39 is optional equipment, and the second condenser 39 can be additionally selected to supplement when the condensation effect of the whole vehicle thermal management system of the pure electric drive excavator is not good.
In one possible embodiment of the present invention, the power battery pack thermal management assembly 4 comprises a fourth tee joint 41, a fifth tee joint 42, a sixth tee joint 43, a seventh tee joint 44, an eighth tee joint 45, a ninth tee joint 46, a thirteenth tee joint 47, a nineteenth tee joint 48, a sixth stop valve 49, a seventh stop valve 410, an eighth stop valve 411, a ninth stop valve 412, a tenth stop valve 413, a second water tank 414, a second water pump 415, a second expansion valve 416, a plate evaporator 417, a power battery pack 418, a second PTC heater 419;
wherein, a first end of the nineteenth tee 48 is connected with the cab air conditioning assembly 3, a third end of the nineteenth tee 48 is connected with a water outlet of the seventh stop valve 410, a water inlet of the seventh stop valve 410 is connected with a first end of the fourth tee 41, a third end of the fourth tee 41 is connected with a water outlet of the hydraulic oil thermal management assembly 2, a second end of the fourth tee 41 is connected with a water inlet of the sixth stop valve 49, a water outlet of the sixth stop valve 49 is connected with a first end of the fifth tee 42, a second end of the fifth tee 42 is connected with a water outlet of the eighth stop valve 411, a water inlet of the eighth stop valve 411 is connected with a water outlet of the second water pump 415, a water inlet of the second water pump 415 is connected with a third end of the ninth tee 46, a second end of the ninth tee 46 is connected with a water outlet of the second water tank 414, a first end of the ninth tee 46 is connected to a third end of the thirteenth tee 47, a first end of the tenth tee 47 is connected to a water outlet of the cab air conditioning unit 3, a second end of the tenth tee 47 is connected to a water outlet of the ninth cut-off valve 412, a water inlet of the ninth cut-off valve 412 is connected to a second end of the eighth tee 45, a third end of the eighth tee 45 is connected to a water inlet of the tenth cut-off valve 413, a water outlet of the tenth cut-off valve 413 is connected to a second end of the nineteenth tee 48, a first end of the eighth tee 45 is connected to a water outlet of the plate evaporator 417, a refrigerant inlet of the plate evaporator 417 is connected to a refrigerant outlet of the second expansion valve, and a refrigerant outlet of the plate evaporator 417 is connected to a second end of the eleventh tee 34, a refrigerant inlet of the second expansion valve is connected with a first end of the eighteenth tee joint 36, a water inlet of the plate evaporator 417 is connected with a first end of the seventh tee joint 44, a third end of the seventh tee joint 44 is connected with a water outlet of the power battery pack 418, a water inlet of the power battery pack 418 is connected with a first end of the sixth tee joint 43, a third end of the sixth tee joint 43 is connected with a water outlet of the second PTC heater 419, a water inlet of the second PTC heater 419 is connected with a third end of the fifth tee joint 42, and the sixth stop valve 49, the seventh stop valve 410, the eighth stop valve 411, the ninth stop valve 412, the tenth stop valve 413, the second water tank 414, the second 415 water pump, the second 416, the power battery pack 418, and the second PTC heater 419 are electrically connected with the vehicle control unit.
Specifically, in the present embodiment, a liquid level sensor is disposed in the second water tank 414, wherein the liquid level sensor is electrically connected to the vehicle controller; in the refrigeration working condition of the power battery pack, the second water pump 415 drives cooling water to pass through the plate-type evaporator 417, a low-temperature high-pressure refrigerant passes through the second expansion valve 416 and then is changed into a low-temperature low-pressure refrigerant, the low-temperature low-pressure refrigerant enters the plate-type evaporator 417, the low-temperature low-pressure refrigerant exchanges heat with the cooling water absorbing heat from the battery, the refrigerant absorbs the heat of the cooling water in the process of thermal evaporation, and the cooled cooling water flows into the battery water channel again under the driving of the second water pump 415 to absorb the heat generated by the battery, so that the purpose of refrigeration of the power battery pack is achieved.
In this embodiment, the second PTC heater 419 is a PTC water heater, which is mainly used to quickly make the temperature of the power battery pack 418 reach the minimum working temperature in an extremely low temperature environment, and at the same time, when the residual heat of the electric drive and the hydraulic oil is insufficient, the PTC water heater can also perform the function of heat supplement. The second water pump 415 may be an electronic water pump with an adjustable PWM rotation speed, and the second water pump 415 is an electronic water pump with a large lift, so as to overcome the problem of excessive water resistance caused by multiple components and long pipelines of the system.
In one possible embodiment of the present invention, said temperature sensing assembly comprises a first temperature sensor 51, a second temperature sensor 52, a third temperature sensor 53, a fourth temperature sensor 54, a fifth temperature sensor 55, and a sixth temperature sensor 56;
the first temperature sensor 51 is connected to the second end of the first tee joint 15, the second temperature sensor 52 is connected to the oil outlet of the hydraulic oil ATS22 (usually, a threaded seat of a paired threaded temperature sensor is welded to an oil outlet pipeline of the hydraulic oil ATS), the third temperature sensor 53 is connected to the second end of the third tee joint 26, the fourth temperature sensor 54 is connected to the second end of the sixth tee joint 43, the fifth temperature sensor 55 is connected to the second end of the seventh tee joint 44, the sixth temperature sensor 56 is connected to the second end of the fourteenth tee joint 17, and the first temperature sensor 51, the second temperature sensor 52, the third temperature sensor 53, the fourth temperature sensor 54, the fifth temperature sensor 55, and the sixth temperature sensor 56 are electrically connected to the vehicle controller.
Specifically, in the present embodiment, the first temperature sensor 51, the third temperature sensor 53, the fourth temperature sensor 54, the fifth temperature sensor 55, the sixth temperature sensor 56, and the second temperature sensor 52 are PT100 platinum thermistor temperature sensors.
Specifically, in the embodiment, the temperature measuring range of the PT100 platinum thermistor temperature sensor is-50 ℃ to 200 ℃, and the temperature sensors are all thread type temperature sensors, and can be arranged in the pipeline in an external tee joint mode. It should be noted that, in other embodiments, other types of temperature sensors may also be used, which are not specifically limited herein, but these schemes are all within the protection scope of the present invention.
To sum up, the whole vehicle thermal management system of the pure electric drive excavator mainly comprises four parts, namely a cab air conditioning component 3, a power battery pack thermal management component 4, an electric drive thermal management component 1 and a hydraulic oil thermal management component 2. Because the comfortable temperature of a human body is coincident with the optimal working temperature range of the battery, the scheme that the loops of the cab air conditioning component 3 and the loop of the power battery pack heat management component 4 are connected in parallel is provided in the whole vehicle heat management system of the pure electric drive excavator, so that the 'one machine with multiple purposes' of the compressor is realized, and the whole vehicle cost can be reduced while the temperature of the power battery is controlled. Meanwhile, the whole vehicle thermal management system of the pure electric drive excavator is combined with the characteristic that the pure electric drive excavator has large heat productivity, waste heat utilization of an electric drive system and hydraulic oil is fully realized, considerable help is provided for heating of a cab and heating of a power battery pack, the utilization rate of energy is improved, and the purposes of saving energy, reducing emission and improving the cruising ability of the excavator are realized.
The invention provides a pure electric drive excavator, which comprises an excavator body and the whole pure electric drive excavator heat management system, wherein the whole pure electric drive excavator heat management system is configured in the excavator body.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention.
Claims (10)
1. The utility model provides a whole car thermal management system of pure electric drive excavator which characterized in that includes: the system comprises a vehicle control unit, a control assembly, an electric drive thermal management assembly, a hydraulic oil thermal management assembly and a temperature sensing assembly;
the input end of the whole vehicle controller is connected with the control assembly, the input end of the whole vehicle controller is electrically connected with the output end of the temperature sensing assembly, the output end of the whole vehicle controller is electrically connected with the control end of the electric driving heat management assembly and the control end of the hydraulic oil heat management assembly, and the electric driving heat management assembly is connected with the hydraulic oil heat management assembly through a pipeline;
wherein the temperature sensing component is configured to collect temperatures of the electrically driven thermal management component, the hydraulic oil thermal management component, and a battery water channel of a purely electrically driven excavator;
the vehicle control unit is configured to control the electric driving thermal management assembly and the hydraulic oil thermal management assembly to provide heat for a cab and a power battery pack of the pure electric driving excavator according to a mode operation instruction sent by the control assembly and data collected by the temperature sensing assembly, so that electric driving of the pure electric driving excavator and waste heat recovery and reasonable redistribution of a hydraulic system are realized.
2. The entire vehicle thermal management system of the pure electric drive excavator according to claim 1, wherein the electric drive thermal management assembly comprises a first water tank, a first water pump, a motor controller, a motor, a first tee joint, a thirteenth tee joint, a fourteenth tee joint, a fifteenth tee joint, an electric control ATS, a third stop valve, a fourth stop valve, a fifth stop valve and a four-way joint;
the water outlet of the first water tank is connected with the second end of a fifteenth tee joint, the third end of the fifteenth tee joint is connected with the water inlet of the first water pump, the water outlet of the first water pump is connected with the water inlet of the motor controller, the water outlet of the motor controller is connected with the water inlet of the motor, the water outlet of the motor is connected with the first end of the first tee joint, the third end of the first tee joint is connected with the first end of the four-way joint, the first end of the fifteenth tee joint is connected with the third end of the fourteenth tee joint, the first end of the fourteenth tee joint is connected with the water outlet of the electric control ATS, the water inlet of the electric control ATS is connected with the first end of the thirteenth tee joint, the third end of the thirteenth tee joint is connected with the water outlet of a third stop valve, the water inlet of the third stop valve is connected with the fourth end of the four-way joint, the water outlet of the fourth stop valve is connected with the water inlet of the electric control stop valve, the motor controller, the electric control unit, the hydraulic oil pump, the water inlet of the electric control stop valve and the electric control unit.
3. The entire vehicle thermal management system of the pure electric drive excavator according to claim 2, wherein the hydraulic oil thermal management assembly comprises a hydraulic control module, a hydraulic oil ATS, a liquid-liquid heat exchanger, a hydraulic oil tank, a second tee joint and a third tee joint;
the electric control ATS is welded with the hydraulic oil ATS, an oil outlet of the hydraulic control module is connected with an oil inlet of the hydraulic oil ATS, an oil outlet of the hydraulic oil ATS is connected with an oil inlet of the liquid-liquid heat exchanger, an oil outlet of the liquid-liquid heat exchanger is connected with an oil inlet of the hydraulic oil tank, a water inlet of the liquid-liquid heat exchanger is connected with the electric driving heat management assembly, a water outlet of the liquid-liquid heat exchanger is connected with a second end of the second tee joint, a third end of the second tee joint is connected with the electric driving heat management assembly, a first end of the second tee joint is connected with a first end of the third tee joint, and the hydraulic oil ATS, the hydraulic oil tank and the whole vehicle controller are electrically connected.
4. The vehicle-mounted thermal management system of a pure electric excavator according to claim 3, further comprising a cab air conditioning assembly, wherein an output end of the vehicle-mounted controller is electrically connected with a control end of the cab air conditioning assembly, and the cab air conditioning assembly is in pipeline connection with the electric drive thermal management assembly and the hydraulic oil thermal management assembly.
5. The entire vehicle thermal management system of a pure electric excavator according to claim 4, wherein the cab air conditioning component comprises a first stop valve, a second stop valve, an eleventh tee joint, a twelfth tee joint, an eighteenth tee joint, a compressor, a first condenser, a second condenser, a condensing fan, a drying bottle, an evaporating fan, an evaporator, a first expansion valve, a warm air core body and a first PTC heater;
the water outlet of the second stop valve is connected with the electrically-driven thermal management assembly, the water inlet of the second stop valve is connected with the first end of the twelfth tee joint, the third end of the twelfth tee joint is connected with the water outlet of the warm air core, the second end of the twelfth tee joint is connected with the water inlet of the eleventh stop valve, the refrigerant inlet of the compressor is connected with the first end of the eleventh tee joint, the refrigerant outlet of the compressor is connected with the refrigerant inlet of the first condenser and the refrigerant inlet of the second condenser, the third end of the eleventh tee joint is connected with the refrigerant inlet of the evaporator, the refrigerant inlet of the first expansion valve is connected with the refrigerant outlet of the first stop valve, the refrigerant inlet of the first stop valve is connected with the second end of the eighteenth tee joint, the third end of the eighteenth tee joint is connected with the refrigerant outlet of the first condenser and the refrigerant outlet of the second condenser, and the first stop valve, the second stop valve, the eleventh stop valve, the compressor, the condensation fan, the evaporator, the warm air heater and the first electric heater controller are connected with the integral unit.
6. The complete vehicle thermal management system of the pure electric excavator according to claim 4, further comprising a power battery pack thermal management assembly, wherein the output end of the complete vehicle controller is electrically connected with the control end of the power battery pack thermal management assembly, a loop of the cab air conditioning assembly is connected in parallel with a loop of the power battery pack thermal management assembly, and the power battery pack thermal management assembly is connected with the electric drive thermal management assembly and the hydraulic oil thermal management assembly through pipelines.
7. The entire vehicle thermal management system of the pure electric excavator according to claim 6, wherein the power battery pack thermal management assembly comprises a fourth tee joint, a fifth tee joint, a sixth tee joint, a seventh tee joint, an eighth tee joint, a ninth tee joint, a tenth tee joint, a nineteenth tee joint, a sixth stop valve, a seventh stop valve, an eighth stop valve, a ninth stop valve, a tenth stop valve, a second water tank, a second water pump, a second expansion valve, a plate evaporator, a power battery pack and a second PTC heater;
wherein, a first end of the nineteenth tee is connected with the cab air-conditioning assembly, a third end of the nineteenth tee is connected with a water outlet of the seventh stop valve, a water inlet of the seventh stop valve is connected with a first end of the fourth tee, a third end of the fourth tee is connected with a water outlet of the hydraulic oil heat management assembly, a second end of the fourth tee is connected with a water inlet of the sixth stop valve, a water outlet of the sixth stop valve is connected with a first end of the fifth tee, a second end of the fifth tee is connected with a water outlet of the eighth stop valve, a water inlet of the eighth stop valve is connected with a water outlet of the second water pump, a water inlet of the second water pump is connected with a third end of the ninth tee, a second end of the ninth tee is connected with a water outlet of the second water tank, a first end of the ninth tee is connected with a third end of the tenth tee, a first end of the tenth tee is connected with a water outlet of the cab air-conditioning assembly, a second end of the tenth tee is connected with a water outlet of the refrigerant evaporator, a second end of the refrigerant evaporator is connected with a water outlet of the eleventh stop valve, a refrigerant evaporator, a water inlet of the eighth tee is connected with a refrigerant evaporator, a water outlet of the eighth tee is connected with a water inlet of the eleventh stop valve, and a refrigerant evaporator, a refrigerant inlet of the eighth tee is connected with a refrigerant evaporator, a refrigerant inlet of the eleventh stop valve is connected with a refrigerant evaporator, a refrigerant inlet of the eleventh stop valve is connected with a refrigerant inlet of the eleventh stop valve, the water inlet of the plate evaporator is connected with the first end of the seventh tee joint, the third end of the seventh tee joint is connected with the water outlet of the power battery pack, the water inlet of the power battery pack is connected with the first end of the sixth tee joint, the third end of the sixth tee joint is connected with the water outlet of the second PTC heater, the water inlet of the second PTC heater is connected with the third end of the fifth tee joint, and the sixth stop valve, the seventh stop valve, the eighth stop valve, the ninth stop valve, the tenth stop valve, the second water tank, the second water pump, the second expansion valve, the power battery pack, the second PTC heater and the whole vehicle controller are electrically connected.
8. The thermal management system for the whole pure electric excavator according to claim 7, wherein the temperature sensing assembly comprises a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor and a sixth temperature sensor;
the first temperature sensor is connected with a second end of the first tee joint, the second temperature sensor is connected with an oil inlet of the liquid-liquid heat exchanger, the third temperature sensor is connected with a second end of the third tee joint, the fourth temperature sensor is connected with a second end of the sixth tee joint, the fifth temperature sensor is connected with a second end of the seventh tee joint, the sixth temperature sensor is connected with a second end of the fourteenth tee joint, and the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the fifth temperature sensor and the sixth temperature sensor are electrically connected with the whole vehicle controller.
9. The entire vehicle thermal management system of a pure electric excavator according to claim 8, wherein the first temperature sensor, the third temperature sensor, the fourth temperature sensor, the fifth temperature sensor, the sixth temperature sensor and the second temperature sensor are PT100 platinum thermal resistance temperature sensors.
10. A pure electric drive excavator is characterized by comprising an excavator body and the whole pure electric drive excavator thermal management system according to any one of claims 1 to 9, wherein the whole pure electric drive excavator thermal management system is arranged in the excavator body.
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