CN111755776A - Thermal management system and electro-hydraulic excavator - Google Patents

Abstract

The embodiment of the invention provides a thermal management system and an electric hydraulic excavator, and relates to the field of thermal management systems. Aims to solve the problem that the existing power battery is heated by an electric heater and has higher cost. The thermal management system comprises a hydraulic cylinder heat dissipation system, wherein the hydraulic cylinder heat dissipation system comprises a first loop and a hydraulic cylinder arranged on the first loop; the battery heating system comprises a second loop and a battery pack arranged on the second loop; and the first heat exchanger is arranged on the first loop and the second loop at the same time. Through first heat exchanger, utilize the work heat of hydraulic oil to heat the battery package, make full use of the heat energy that hydraulic system produced in the working process.

Description

Thermal management system and electro-hydraulic excavator

technical field

The invention relates to the field of thermal management systems, in particular to a thermal management system and an electric hydraulic excavator.

Background technique

With the continuous development of new energy technology, the field of construction machinery has accelerated the pace of research and development of electric excavators. As the power battery in the key system of the electric excavator, its performance, life and reliability are closely related to the battery temperature. In the prior art, in a low temperature environment, the performance of the power battery will be significantly reduced, and the charging and discharging capability will be significantly restricted. Therefore, the battery thermal management system is very important.

In the existing battery thermal management system, the battery heating method generally adopts a high-voltage electric heater, but the cost of its components is high, and the heating mode is relatively simple.

SUMMARY OF THE INVENTION

The objects of the present invention include, for example, providing a thermal management system, which can improve the heating of the existing power battery by using an electric heater, which has the problem of high cost.

The purpose of the present invention also includes providing an electric hydraulic excavator, which can improve the heating of the existing power battery by using an electric heater, which has the problem of high cost.

Embodiments of the present invention can be implemented as follows:

Embodiments of the present invention provide a thermal management system, including:

A hydraulic cylinder cooling system, the hydraulic cylinder cooling system includes a first circuit and a hydraulic cylinder arranged on the first circuit; a battery heating system, the battery heating system includes a second circuit and a battery pack arranged on the second circuit; the first heat exchange The first heat exchanger is arranged on the first circuit and the second circuit at the same time.

In addition, the thermal management system provided by the embodiments of the present invention may also have the following additional technical features:

Optionally: the battery heating system further includes an accumulator, and the accumulator is arranged on the second circuit.

Optionally: the thermal management system further includes a cab heating system, the cab heating system includes a third circuit and an evaporator arranged on the third circuit; the thermal management system further includes a second heat exchanger, and the second heat exchanger simultaneously installed on the first loop and the third loop.

Optionally: the thermal management system further includes a third heat exchanger, and the third heat exchanger is arranged on the first circuit.

Optionally: the first loop includes a main circulation loop and a first branch, and both ends of the first branch are communicated with the main circulation loop;

The thermal management system further includes an oil tank, the hydraulic cylinder and the oil tank are arranged on the main circulation circuit, and the first heat exchanger is arranged on the first branch circuit and the second circuit at the same time.

Optionally: the first loop further includes a second branch, and both ends of the second branch are communicated with the main circulation loop;

The second heat exchanger is provided on both the second branch circuit and the third circuit.

Optionally: the first loop also includes a third branch, and both ends of the third branch are communicated with the main circulation loop;

The third heat exchanger is arranged on the third branch.

Optionally: the first branch, the second branch and the third branch are communicated at the same position near one end of the hydraulic cylinder.

Optionally: the thermal management system further includes a first delivery pump, a second delivery pump and a third delivery pump;

The first delivery pump is arranged on the main circulation circuit, the second delivery pump is arranged on the second circuit, and the third delivery pump is arranged on the third circuit.

Embodiments of the present invention also provide an electric hydraulic excavator. Electric hydraulic excavators include a thermal management system.

The beneficial effects of the thermal management system and the electric hydraulic excavator according to the embodiments of the present invention include, for example:

Thermal management system, the first heat exchanger is used to exchange the heat between the first circuit and the second circuit, use the working heat of the hydraulic oil to heat the battery pack, make full use of the heat energy generated by the hydraulic system during the working process, and reduce energy waste, Improve the energy utilization rate of the whole vehicle, achieve energy saving and emission reduction, and make the excavator more intelligent. At the same time, the heat generated by the hydraulic energy is used to provide heat for the battery preheating and reduce the cold start of the power battery.

The electric hydraulic excavator, including the above-mentioned thermal management system, can improve the heating of the existing power battery by using an electric heater, which has the problem of high cost.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic diagram of a thermal management system provided by an embodiment of the present invention.

Icon: 10-thermal management system; 100-first circuit; 110-main circulation circuit; 111-hydraulic cylinder; 112-first delivery pump; 113-oil tank; 120-first branch; 130-second branch; 140-third branch; 200-second circuit; 210-energy storage; 220-second delivery pump; 230-battery pack; 300-third circuit; 310-evaporator; 320-third delivery pump; 400 - first heat exchanger; 410 - second heat exchanger; 420 - third heat exchanger.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, or It is the orientation or positional relationship that the product of the invention is usually placed in use, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation , so it should not be construed as a limitation of the present invention.

In addition, where the terms "first", "second" and the like appear, they are only used to differentiate the description, and should not be construed as indicating or implying relative importance.

It should be noted that the features in the embodiments of the present invention may be combined with each other without conflict.

The thermal management system 10 provided in this embodiment will be described in detail below with reference to FIG. 1 .

Referring to FIG. 1, an embodiment of the present invention provides a thermal management system 10, including: a hydraulic cylinder heat dissipation system, the hydraulic cylinder heat dissipation system includes a first circuit 100 and a hydraulic cylinder 111 disposed on the first circuit 100; battery heating The system, the battery heating system includes a second circuit 200 and a battery pack 230 arranged on the second circuit 200 ;

The heat generated during the operation of the hydraulic cylinder 111 is dissipated through the hydraulic cylinder cooling system. The high-temperature hydraulic oil flows to the first heat exchanger 400 through the first circuit 100, and exchanges heat with the battery cooling liquid in the second circuit 200 at the first heat exchanger 400, and the cooling liquid obtains heat to provide heat for the battery.

This embodiment is described by taking the thermal management system 10 on an electric excavator as an example. After the electric excavator works normally, the high-temperature hydraulic oil exchanges heat with the battery cooling liquid in the second circuit 200 in the first heat exchanger 400, and the cooling liquid provides heat for the battery after obtaining heat.

Continuing to refer to FIG. 1 , in this embodiment, the battery heating system further includes an accumulator 210 , and the accumulator 210 is disposed on the second circuit 200 .

After the cooling liquid obtains heat, it flows into the accumulator 210 to store the heat. When the electric excavator stops briefly and the average temperature of the battery is lower than the low temperature of the battery, the cooling liquid in the accumulator 210 provides heat for the battery and maintains its working environment temperature.

Specifically, referring to FIG. 1 , the first circuit 100 includes a main circulation circuit 110 and a first branch circuit 120. Both ends of the first branch circuit 120 are communicated with the main circulation circuit 110; the thermal management system 10 further includes an oil tank 113, a hydraulic cylinder 111 and the oil tank 113 are arranged on the main circulation circuit 110 , and the first heat exchanger 400 is arranged on the first branch circuit 120 and the second circuit 200 at the same time.

The high-temperature hydraulic oil flowing out of the hydraulic cylinder 111 flows to the main circulation circuit 110 , and then partially flows to the first branch 120 , exchanges heat with the battery coolant in the second circuit 200 through the first heat exchanger 400 , and then flows back to the oil tank 113 .

Specifically, continuing to refer to FIG. 1 , the thermal management system 10 further includes a first delivery pump 112 and a second delivery pump 220 . The first delivery pump 112 is provided on the main circulation circuit 110 , and the second delivery pump 220 is provided on the second circuit 200 . superior.

The first delivery pump 112 is used to provide power for the high-temperature hydraulic oil to circulate along the main circulation circuit 110 , and at the same time to provide the power for the high-temperature hydraulic oil to flow to the first branch circuit 120 . The high-temperature hydraulic oil flowing out of the hydraulic cylinder 111 flows to the first branch 120 , and exchanges heat with the battery cooling liquid through the first heat exchanger 400 .

The second delivery pump 220 is used to provide the power to circulate and reciprocate the battery cooling liquid along the second circuit 200. The battery cooling liquid flows to the first heat exchanger 400 to obtain the heat of the high-temperature hydraulic oil, and then flows to the accumulator 210 for storage. Heat is released to the battery pack 230 when the temperature of the battery pack 230 is lower than the preset temperature.

1 , in this embodiment, the thermal management system 10 further includes a cab heating system, and the cab heating system includes a third circuit 300 and an evaporator 310 disposed on the third circuit 300; the thermal management system 10 further includes a first The second heat exchanger 410, the second heat exchanger 410 is disposed on the first circuit 100 and the third circuit 300 at the same time.

Use the heat generated by hydraulic energy to provide heat to the cab. The high-temperature hydraulic oil also exchanges heat with the cab heating coolant in the third circuit 300 through the second heat exchanger 410 to provide heat for the cab and create a comfortable environment.

Specifically, referring to FIG. 1 , the first circuit 100 further includes a second branch 130 , both ends of the second branch 130 are communicated with the main circulation circuit 110 ; the second heat exchanger 410 is simultaneously arranged on the second branch 130 and the main circulation circuit 110 . On the third loop 300.

The high-temperature hydraulic oil flowing out of the hydraulic cylinder 111 flows to the main circulation circuit 110 , and then partially flows to the second branch circuit 130 , and exchanges heat with the cab heating coolant in the third circuit 300 through the second heat exchanger 410 .

Specifically, referring to FIG. 1 , the thermal management system 10 further includes a third delivery pump 320 , and the third delivery pump 320 is provided on the third circuit 300 .

The third delivery pump 320 provides power to circulate the cab heating coolant along the third circuit 300 . During the flow of the heating and cooling liquid, heat is obtained through the second heat exchanger 410 .

Continuing to refer to FIG. 1 , in this embodiment, the thermal management system 10 further includes a third heat exchanger 420 , and the third heat exchanger 420 is disposed on the first circuit 100 .

A part of the high-temperature hydraulic oil flowing out of the hydraulic cylinder 111 goes to the first heat exchanger 400 to exchange heat with the cooling liquid of the battery pack 230 , part of it flows through the second heat exchanger 410 to exchange heat with the cab heating coolant, and the other part goes directly to the third heat exchanger 410 . Heat exchanger 420 provides cooling.

Specifically, referring to FIG. 1 , the first circuit 100 further includes a third branch 140 , and both ends of the third branch 140 are communicated with the main circulation circuit 110 ; the third heat exchanger 420 is arranged on the third branch 140 .

The high-temperature hydraulic oil flowing out of the hydraulic cylinder 111 flows to the main circulation circuit 110 , and then partially flows to the third branch 140 for heat exchange through the third heat exchanger 420 .

Continuing to refer to FIG. 1 , in this embodiment, the first branch 120 , the second branch 130 and the third branch 140 communicate with one end of the hydraulic cylinder 111 at the same position.

After the high-temperature hydraulic oil of the hydraulic cylinder 111 flows out, it flows to the first branch 120 , the second branch 130 and the third branch 140 respectively at the same position, so that the uniform distribution of the high-temperature hydraulic oil can be realized, and the first branch 120 and the third branch 140 can be distributed. The heat supply of the two branches 130 .

Embodiments of the present invention also provide an electric hydraulic excavator. The electro-hydraulic excavator includes a thermal management system 10 . It can be improved that the existing power battery is heated by an electric heater, but there is a problem of high cost.

In some embodiments:

Please refer to FIG. 1 : in the schematic diagram of the thermal management system 10 shown in FIG. 1 , the first circuit 100 includes a main circulation circuit 110 , a first branch 120 , a second branch 130 and a third branch 140 , hydraulic cylinders 111 , The first delivery pump 112 and the oil tank 113 are arranged on the main circulation circuit 110 , and the first branch 120 , the second branch 130 and the third branch 140 are jointly connected to the main circulation circuit 110 in parallel. The battery pack 230 , the accumulator 210 and the second delivery pump 220 are arranged on the second circuit 200 . The third delivery pump 320 and the cab evaporator 310 are provided on the third circuit 300 . The first heat exchanger 400 is arranged on the first branch 120 and the second circuit 200, and is used to realize the heat exchange between the high temperature hydraulic oil and the cooling liquid of the battery pack 230. The high temperature hydraulic oil flows out from the hydraulic cylinder 111 and then flows to the first branch. Road 120, and then flow back to tank 113. The second heat exchanger 410 is arranged on the second branch 130 and the third circuit 300, and is used to realize the heat exchange between the high-temperature hydraulic oil and the cab heating coolant. The high-temperature hydraulic oil flows out from the hydraulic cylinder 111 and then flows to the second branch. Road 130, and then flows back to the third branch 140, and then flows back to the fuel tank 113. The third heat exchanger 420 is disposed on the third branch 140 for cooling the high-temperature hydraulic oil, and then flows back to the oil tank 113 .

The thermal management system 10 provided by this embodiment has at least the following advantages:

The battery pack 230 is heated by using the heat energy generated during the working process of the hydraulic system to maintain the working environment temperature of the battery pack 230 . An accumulator 210 is set on the second circuit 200, and the cooling liquid flows into the accumulator 210 to store the heat after obtaining heat. When the electric excavator stops for a short time and the average temperature of the battery is lower than the low temperature of the battery, the cooling liquid in the accumulator 210 is Battery powered.

The cab is heated by using the heat energy generated during the working process of the hydraulic system. Reduce energy waste and improve vehicle energy utilization.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical scope disclosed by the present invention can easily think of changes or substitutions. All should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A thermal management system, characterized in that, comprising: a hydraulic cylinder heat dissipation system, the hydraulic cylinder heat dissipation system comprising a first circuit (100) and a hydraulic cylinder (111) arranged on the first circuit (100); a battery heating system, the battery heating system comprising a second circuit (200) and a battery pack (230) arranged on the second circuit (200); A first heat exchanger (400), the first heat exchanger (400) is provided on the first circuit (100) and the second circuit (200) at the same time. 2. The thermal management system of claim 1, wherein: The battery heating system further comprises an accumulator (210), and the accumulator (210) is arranged on the second circuit (200). 3. The thermal management system of claim 2, wherein: The thermal management system further includes a cab heating system including a third circuit (300) and an evaporator (310) disposed on the third circuit (300); The thermal management system further includes a second heat exchanger (410), the second heat exchanger (410) being provided on both the first circuit (100) and the third circuit (300). 4. The thermal management system of claim 3, wherein: The thermal management system further includes a third heat exchanger (420) disposed on the first circuit (100). 5. The thermal management system of claim 4, wherein: The first circuit (100) includes a main circulation circuit (110) and a first branch circuit (120), and both ends of the first branch circuit (120) are communicated with the main circulation circuit (110); The thermal management system further comprises an oil tank (113), the hydraulic cylinder (111) and the oil tank (113) are arranged on the main circulation circuit (110), and the first heat exchanger (400) is arranged at the same time on the first branch (120) and the second loop (200). 6. The thermal management system of claim 5, wherein: The first loop (100) further includes a second branch (130), and both ends of the second branch (130) communicate with the main circulation loop (110); The second heat exchanger (410) is simultaneously arranged on the second branch circuit (130) and the third circuit (300). 7. The thermal management system of claim 6, wherein: The first circuit (100) further comprises a third branch (140), both ends of the third branch (140) are communicated with the main circulation circuit (110); The third heat exchanger (420) is arranged on the third branch (140). 8. The thermal management system of claim 7, wherein: One end of the first branch (120), the second branch (130) and the third branch (140) close to the hydraulic cylinder (111) communicates at the same position. 9. The thermal management system of claim 8, wherein: The thermal management system further includes a first delivery pump (112), a second delivery pump (220), and a third delivery pump (320); The first delivery pump (112) is arranged on the main circulation circuit (110), the second delivery pump (220) is arranged on the second circuit (200), and the third delivery pump (320) ) is provided on the third loop (300). 10. An electric hydraulic excavator, characterized in that: The electro-hydraulic excavator includes the thermal management system of any one of claims 1-9.

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