Thermal management system and electric hydraulic excavator

Abstract

Embodiments of the present invention provide a thermal management system and an electric hydraulic excavator, relating to the field of thermal management systems. The purpose is to improve the high cost of existing power battery heating systems using electric heaters. The thermal management system includes a hydraulic cylinder heat dissipation system, which includes a first circuit and a hydraulic cylinder disposed on the first circuit; a battery heating system, which includes a second circuit and a battery pack disposed on the second circuit; and a first heat exchanger, which is disposed on both the first circuit and the second circuit. The first heat exchanger utilizes the operating heat of the hydraulic oil to heat the battery pack, fully utilizing the heat energy generated by the hydraulic system during operation.

Description

Technical Field

[0001] The present invention relates to the field of thermal management systems, and in particular to a thermal management system and an electric hydraulic excavator. Background Art

[0002] With the continuous development of new energy technologies, the construction machinery industry has accelerated the development of electric excavators. As a key system in electric excavators, the performance, lifespan, and reliability of power batteries are closely related to battery temperature. Existing technologies significantly reduce power battery performance in low-temperature environments, significantly limiting charge and discharge capabilities. Therefore, battery thermal management systems are crucial.

[0003] Existing battery thermal management systems generally use high-voltage electric heaters for battery heating, but their component costs are high and the heating mode is relatively simple. Summary of the Invention

[0004] The objectives of the present invention include, for example, providing a thermal management system that can improve the problem of high cost in existing power batteries that are heated by electric heaters.

[0005] The purpose of the present invention also includes providing an electric hydraulic excavator that can improve the problem of high cost of existing power batteries being heated by electric heaters.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] An embodiment of the present invention provides a thermal management system, comprising:

[0008] A hydraulic cylinder heat dissipation system includes a first circuit and a hydraulic cylinder arranged on the first circuit; a battery heating system includes a second circuit and a battery pack arranged on the second circuit; and a first heat exchanger is arranged on both the first circuit and the second circuit.

[0009] In addition, the thermal management system provided by the embodiments of the present invention may also have the following additional technical features:

[0010] Optionally, the battery heating system further includes an energy storage device, which is arranged on the second circuit.

[0011] Optionally: the thermal management system also 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 also includes a second heat exchanger, and the second heat exchanger is arranged on both the first circuit and the third circuit.

[0012] Optionally: the thermal management system further includes a third heat exchanger, and the third heat exchanger is arranged on the first circuit.

[0013] Optionally, the first circuit includes a main circulation circuit and a first branch circuit, and both ends of the first branch circuit are connected to the main circulation circuit;

[0014] The thermal management system also includes an oil tank. The hydraulic cylinder and the oil tank are arranged on the main circulation loop, and the first heat exchanger is arranged on the first branch and the second loop at the same time.

[0015] Optionally, the first circuit further includes a second branch, and both ends of the second branch are connected to the main circulation circuit;

[0016] The second heat exchanger is arranged on both the second branch and the third loop.

[0017] Optionally, the first circuit further includes a third branch, and both ends of the third branch are connected to the main circulation circuit;

[0018] The third heat exchanger is arranged on the third branch.

[0019] Optionally, the first branch, the second branch, and the third branch are connected at the same position close to one end of the hydraulic cylinder.

[0020] Optionally: the thermal management system further includes a first delivery pump, a second delivery pump and a third delivery pump;

[0021] The first delivery pump is arranged on the main circulation loop, the second delivery pump is arranged on the second loop, and the third delivery pump is arranged on the third loop.

[0022] An embodiment of the present invention further provides an electric hydraulic excavator. The electric hydraulic excavator includes a thermal management system.

[0023] The thermal management system and electric hydraulic excavator according to the embodiments of the present invention have the following beneficial effects, for example:

[0024] The thermal management system's first heat exchanger exchanges heat between the first and second circuits, using the hydraulic oil's operating heat to heat the battery pack. This fully utilizes the heat generated by the hydraulic system during operation, reducing energy waste and improving vehicle energy efficiency, achieving energy conservation and emission reduction, making the excavator more intelligent. The heat generated by the hydraulic system also provides heat for battery preheating, reducing the risk of cold starts.

[0025] The electric hydraulic excavator, including the above-mentioned thermal management system, can improve the problem that the existing power battery is heated by an electric heater, which has a high cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of a thermal management system provided in an embodiment of the present invention.

[0028] Icons: 10-thermal management system; 100-first circuit; 110-main circulation circuit; 111-hydraulic cylinder; 112-first delivery pump; 113-fuel tank; 120-first branch; 130-second branch; 140-third branch; 200-second circuit; 210-energy accumulator; 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 DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0032] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0034] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0035] The following combination Figure 1 The thermal management system 10 provided in this embodiment is described in detail.

[0036] Please refer to Figure 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 arranged on the first circuit 100; a battery heating system, the battery heating system includes a second circuit 200 and a battery pack 230 arranged on the second circuit 200; a first heat exchanger 400, and the first heat exchanger 400 is arranged on both the first circuit 100 and the second circuit 200.

[0037] Heat generated during operation by hydraulic cylinder 111 is dissipated through the hydraulic cylinder cooling system. The hot hydraulic oil flows through first circuit 100 to first heat exchanger 400, where it exchanges heat with the battery coolant in second circuit 200. The heat gained from the coolant then provides heat to the batteries.

[0038] This embodiment uses the thermal management system 10 on an electric excavator as an example. When the electric excavator is operating normally, the high-temperature hydraulic oil exchanges heat with the battery coolant in the second circuit 200 in the first heat exchanger 400, and the coolant gains heat to heat the battery.

[0039] Continue to refer to Figure 1 In this embodiment, the battery heating system further includes an energy storage device 210 , which is disposed on the second loop 200 .

[0040] After obtaining heat, the coolant flows into the energy storage device 210 to store heat. When the electric excavator is temporarily shut down and the average temperature of the battery is lower than the minimum temperature of the battery, the coolant in the energy storage device 210 provides heat for the battery to maintain its working environment temperature.

[0041] Specifically, refer to Figure 1 The first circuit 100 includes a main circulation circuit 110 and a first branch 120, and both ends of the first branch 120 are connected to the main circulation circuit 110; the thermal management system 10 also includes an oil tank 113, a hydraulic cylinder 111 and an oil tank 113 are arranged on the main circulation circuit 110, and the first heat exchanger 400 is also arranged on the first branch 120 and the second circuit 200.

[0042] The high-temperature hydraulic oil flowing out of the hydraulic cylinder 111 flows to the main circulation loop 110 , then partially flows to the first branch 120 , exchanges heat with the battery coolant in the second loop 200 through the first heat exchanger 400 , and then flows back to the oil tank 113 .

[0043] Specifically, continue to refer to Figure 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 disposed on the main circulation loop 110 , and the second delivery pump 220 is disposed on the second loop 200 .

[0044] First delivery pump 112 is used to power the high-temperature hydraulic oil to circulate along main circulation loop 110 and to flow to first branch line 120. The high-temperature hydraulic oil flowing out of hydraulic cylinder 111 flows to first branch line 120 and exchanges heat with the battery coolant through first heat exchanger 400.

[0045] The second delivery pump 220 is used to provide power for the battery coolant to circulate back and forth along the second loop 200. The battery coolant flows to the first heat exchanger 400 to obtain heat from the high-temperature hydraulic oil, and then flows to the energy storage device 210 for storage. When the temperature of the battery pack 230 is lower than the preset temperature, the heat is released to the battery pack 230.

[0046] Continue to refer to Figure 1 In this embodiment, the thermal management system 10 also includes a cab heating system, which includes a third circuit 300 and an evaporator 310 arranged on the third circuit 300; the thermal management system 10 also includes a second heat exchanger 410, which is arranged on both the first circuit 100 and the third circuit 300.

[0047] The heat generated by the hydraulic energy is used to heat 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, providing heat to the cab and creating a comfortable environment.

[0048] Specifically, refer to Figure 1 The first circuit 100 further includes a second branch 130 , both ends of which are connected to the main circulation circuit 110 ; the second heat exchanger 410 is disposed on both the second branch 130 and the third circuit 300 .

[0049] The high-temperature hydraulic oil flowing out of the hydraulic cylinder 111 flows to the main circulation loop 110 , and then partially flows to the second branch 130 , and exchanges heat with the cab heating coolant in the third loop 300 through the second heat exchanger 410 .

[0050] Specifically, refer to Figure 1The thermal management system 10 further includes a third delivery pump 320 , which is disposed on the third circuit 300 .

[0051] The third delivery pump 320 provides power for the cab heating coolant to circulate along the third loop 300. The heating coolant obtains heat through the second heat exchanger 410 during the flow.

[0052] Continue to refer to Figure 1 In this embodiment, the thermal management system 10 further includes a third heat exchanger 420 , which is disposed on the first loop 100 .

[0053] 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 coolant of the battery pack 230, part 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 420 for cooling.

[0054] Specifically, refer to Figure 1 The first circuit 100 further includes a third branch 140 , both ends of which are connected to the main circulation circuit 110 ; the third heat exchanger 420 is disposed on the third branch 140 .

[0055] The high-temperature hydraulic oil flowing out of the hydraulic cylinder 111 flows to the main circulation loop 110 , and then partially flows to the third branch 140 to undergo heat exchange through the third heat exchanger 420 .

[0056] Continue to refer to Figure 1 In this embodiment, the first branch 120, the second branch 130 and the third branch 140 are connected at the same position near the end of the hydraulic cylinder 111.

[0057] 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 at the same position respectively, which can achieve uniform diversion of the high-temperature hydraulic oil and meet the heat supply of the first branch 120 and the second branch 130.

[0058] An embodiment of the present invention further provides an electric hydraulic excavator including a thermal management system 10 , which can improve the problem of high cost of heating existing power batteries using electric heaters.

[0059] In some embodiments:

[0060] Please refer to Figure 1 : Figure 1In the schematic diagram of the thermal management system 10, the first circuit 100 includes a main circulation loop 110, a first branch 120, a second branch 130, and a third branch 140. A hydraulic cylinder 111, a first delivery pump 112, and a fuel tank 113 are provided on the main circulation loop 110. The first branch 120, the second branch 130, and the third branch 140 are connected in parallel to the main circulation loop 110. A battery pack 230, an energy accumulator 210, and a second delivery pump 220 are provided on the second circuit 200. A third delivery pump 320 and a cab evaporator 310 are provided on the third circuit 300. A first heat exchanger 400 is provided on the first branch 120 and the second circuit 200 to exchange heat between the high-temperature hydraulic oil and the coolant in the battery pack 230. The high-temperature hydraulic oil flows from the hydraulic cylinder 111, then flows to the first branch 120 and back to the fuel tank 113. Second heat exchanger 410, located on second branch 130 and third circuit 300, is used to exchange heat between high-temperature hydraulic oil and cab heating coolant. The high-temperature hydraulic oil flows from hydraulic cylinder 111, then flows to second branch 130, then back to third branch 140, and finally back to fuel tank 113. Third heat exchanger 420, located on third branch 140, is used to cool the high-temperature hydraulic oil before it flows back to fuel tank 113.

[0061] The thermal management system 10 provided in this embodiment has at least the following advantages:

[0062] The heat energy generated during the hydraulic system's operation is used to heat the battery pack 230, maintaining its operating temperature. An energy accumulator 210 is provided on the second circuit 200. The coolant, after receiving heat, flows into the energy accumulator 210 for storage. When the electric excavator is briefly shut down and the average battery temperature falls below the minimum battery temperature, the coolant in the energy accumulator 210 provides heat for the battery.

[0063] The heat energy generated during the operation of the hydraulic system is used to heat the cab, reducing energy waste and improving the energy utilization rate of the entire vehicle.

[0064] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A thermal management system, characterized in that: include: A 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, comprising a second circuit (200) and a battery pack (230) arranged on the second circuit (200); the battery heating system further comprising an energy storage device (210), the energy storage device (210) being arranged on the second circuit (200); A cab heating system, comprising a third circuit (300) and an evaporator (310) arranged on the third circuit (300); a first heat exchanger (400), the first heat exchanger (400) being disposed on both the first circuit (100) and the second circuit (200); a second heat exchanger (410), the second heat exchanger (410) being disposed on both the first circuit (100) and the third circuit (300); a third heat exchanger (420), the third heat exchanger (420) being disposed on the first circuit (100); The first circuit (100) comprises a main circulation circuit (110) and a first branch circuit (120), and both ends of the first branch circuit (120) are connected to the main circulation circuit (110); The thermal management system further includes an oil tank (113), the hydraulic cylinder (111) and the oil tank (113) are arranged on the main circulation loop (110), and the first heat exchanger (400) is simultaneously arranged on the first branch (120) and the second loop (200); The high-temperature hydraulic oil flowing out of the hydraulic cylinder (111) flows to the main circulation loop (110), then partially flows to the first branch (120), exchanges heat with the battery coolant in the second loop (200) through the first heat exchanger (400), and then flows back to the oil tank (113); The first circuit (100) further includes a second branch (130), both ends of the second branch (130) being in communication with the main circulation circuit (110); The second heat exchanger (410) is provided on both the second branch (130) and the third circuit (300); The first circuit (100) further includes a third branch (140), both ends of the third branch (140) being in communication with the main circulation circuit (110); The third heat exchanger (420) is arranged on the third branch (140); The first branch (120), the second branch (130), and the third branch (140) are connected at the same position at one end close to the hydraulic cylinder (111).

2. The thermal management system according to claim 1, 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 loop (110), the second delivery pump (220) is arranged on the second loop (200), and the third delivery pump (320) is arranged on the third loop (300).

3. An electric hydraulic excavator, characterized in that: The electric hydraulic excavator includes the thermal management system according to claim 1 or 2.

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