Electric construction machinery

Abstract

To improve safety during maintenance.SOLUTION: An electric construction machine includes: a base plate extending in the horizontal direction; a battery unit located in a rear area above the base plate; a cooling unit that includes a cooling fan that is provided in front of the battery unit in the rear area and that can blow air in the width direction of the base plate, and an oil cooler that is provided in the width direction of the cooling fan; and an air cooling component with multiple devices arranged sequentially across the width of the cooling unit in the rear area.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an electric construction machine.

Background Art

[0002] Patent Document 1 discloses an electric hydraulic excavator as an example of an electric construction machine. Inside the upper swing body of the electric hydraulic excavator, a hydraulic pump, an electric motor, a cooling fan, and an oil cooler are arranged. The electrical equipment in the upper swing body is driven by power supply from an external power supply cable or from a battery unit provided inside the upper swing body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in Patent Document 1 above, it is not specified how to arrange the battery unit that drives electrical equipment such as an electric motor inside the upper swing body. Therefore, the positional relationship between the battery unit and other devices (electric motor, hydraulic pump, etc.) is not specified either. In such an electric hydraulic excavator, in order to ensure the stability of the machine, it is desired to arrange the battery unit with a high specific gravity at the rear to reduce the machine mass and thereby suppress power consumption. Furthermore, while ensuring the accessibility for maintenance of electrical equipment such as an electric motor and a hydraulic pump and the battery unit, it is desired to improve the durability of each device.

[0005] The present invention has been made in view of such problems, and an object thereof is to provide an electric construction machine capable of improving the durability of devices while ensuring the maintainability of each device. [Means for solving the problem]

[0006] An electric construction machine according to one aspect of the present invention comprises: a base plate extending horizontally; a battery unit provided in a rear region on the base plate; a cooling unit provided in front of the battery unit in the rear region and having a cooling fan capable of blowing air in the width direction of the base plate, and an oil cooler integrally provided in the width direction of the cooling fan; and an air-cooling component having a plurality of devices sequentially arranged in the width direction of the cooling unit in the rear region. The air-cooling component comprises a hydraulic pump, an electric motor, and a controller unit, arranged sequentially from one side to the other in the width direction, with only the hydraulic pump being positioned so as not to overlap with the battery unit in the front or rear direction. It further includes a lateral partition plate that protrudes from the base plate and extends across the width direction of the base plate, dividing the area on the base plate into a rear region and a front region, and the air-cooling component is provided so as to be sandwiched from the front and rear by the battery unit and the lateral partition plate. [Effects of the Invention]

[0007] According to the above-described electric construction machinery, it is possible to improve the durability of the equipment while ensuring the maintainability of each component. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view of an electric hydraulic excavator according to an embodiment of the present invention. [Figure 2] This is a schematic plan view showing the internal structure of the upper rotating body of an electric hydraulic excavator according to an embodiment of the present invention. [Figure 3] This is a left side view of the upper rotating body of an electric hydraulic excavator according to an embodiment of the present invention. [Figure 4] This is a right side view of the upper rotating body of an electric hydraulic excavator according to an embodiment of the present invention. [Figure 5] This is a left side view showing the internal structure of the rear region of the upper rotating body of an electric hydraulic excavator according to an embodiment of the present invention. [Figure 6] This is a cross-sectional view taken along line VII-VII in Figure 5. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described in detail below with reference to Figures 1 to 6. <Electric hydraulic excavator (electric construction machinery)> As shown in Figure 1, the electric hydraulic excavator 200, an example of an electric construction machine, is equipped with a lower traveling body 210 and an upper rotating body 220. Hereinafter, the direction in which gravity acts when the electric hydraulic excavator 200 is installed on a horizontal surface will be referred to as the vertical direction.

[0010] <Lower running body> The lower running body 210 has a pair of tracks 211. The lower running body 210 moves when these tracks 211 are driven by a hydraulic motor (not shown). The direction of travel of the lower running body 210 is referred to as the front-rear direction, with the front side of the travel direction (the normal forward direction, the side on which the blade 212 described below is provided) being referred to as the front, and the rear side of the travel direction, which is opposite the front, being referred to as the rear. Also, looking in the forward direction, the right side is referred to as "right," and the left side as "left." A pair of tracks 211 are provided on the left and right sides. The front of the lower traveling body 210 is equipped with a blade 212, which serves as a dozer blade and extends in the width direction of the lower traveling body 210 (hereinafter simply referred to as the width direction). The height position of the blade 212 can be adjusted by being driven by a hydraulic cylinder.

[0011] <Upper rotating body> As shown in Figure 1, the upper rotating body 220 is mounted on the lower traveling body 210. The upper rotating body 220 is connected to the lower traveling body 210 via a swing circle 215. The swing circle 215 is an annular shape centered on a rotation axis that extends in the vertical direction. The upper rotating body 220 is made rotatable around the rotation axis relative to the lower traveling body 210 by the swing circle 215. As shown in Figures 1 and 2, the upper slewing body 220 includes a work implement 221, a slewing frame 10, a slewing motor 30, a hydraulic valve 31, an oil tank 32, an operating space 40, a battery unit 50, a battery management system unit 51, a cooling unit 60, an air-cooling component 70, a protector 80, and an exterior panel 90.

[0012] <Work machine> As shown in FIG. 1, the work machine 221 has a boom 222, an arm 223, and a bucket 224. The work machine 221 performs various operations such as excavation by driving the boom 222, the arm 223, and the bucket 224 by respective hydraulic cylinders. Hereinafter, in a state where the work machine 221 faces the front of the electric hydraulic excavator 200, the width direction of the upper swing body 220 is simply referred to as the "width direction". Further, the direction toward the center in the width direction is referred to as the "inner side in the width direction", and the direction from the center in the width direction toward the left side (one side in the width direction) or the right side (the other side in the width direction) is referred to as the "outer side in the width direction".

[0013] <Swing frame> As shown in FIG. 2, the swing frame 10 has a base plate 20, a horizontal partition plate 21, a front vertical partition plate 22, a front reinforcing plate 23, and a bracket 24.

[0014] <Base plate> The base plate 20 is a plate-shaped member extending in the horizontal direction. That is, the base plate 20 extends in the front-rear direction and the width direction. The base plate 20 may be constituted by a single steel plate, or may be constituted by integrally combining a plurality of steel plates. The lower surface of the base plate 20 is fixed on the swing circle 215. Thereby, the swing frame 10 is supported from below by the swing circle 215.

[0015] <Horizontal partition plate> The horizontal partition plate 21 is a plate-shaped member protruding upward from the upper surface of the base plate 20 and extending in the width direction. The horizontal partition plate 21 extends with the width direction as the longitudinal direction. The horizontal partition plate 21 is provided near the center in the front-rear direction of the base plate 20, away from the front end and the rear end of the base plate 20. The horizontal partition plate 21 extends over both end portions in the width direction of the base plate 20, that is, both left and right end portions.

[0016] Here, among the regions on the base plate 20, the region on the front side of the horizontal partition plate 21 is referred to as the front region F. Among the regions on the base plate 20, the region on the rear side of the horizontal partition plate 21 is referred to as the rear region R. That is, the region on the base plate 20 is partitioned by the horizontal partition plate 21 into the front region F on the front side and the rear region R on the rear side.

[0017] <Front vertical partition plate> The front vertical partition plate 22 is a plate-like member that protrudes from the upper surface of the base plate 20 and extends in the front-rear direction. The front vertical partition plates 22 are provided in a pair, spaced apart from each other in the width direction, on the front side of the horizontal partition plate 21 on the upper surface of the base plate 20. The rear end of the front vertical partition plate 22 is connected to the surface facing the front side of the horizontal partition plate 21. The pair of front vertical partition plates 22 are provided so as to approach each other from the rear ends, which are the connection portions with the horizontal partition plate 21, toward the front side.

[0018] <Front reinforcing plate> The front reinforcing plate 23 is at the front of the pair of front vertical partition plates 22 and is integrally fixed to the pair of front vertical partition plates 22.

[0019] <Bracket> The bracket 24 is fixed to the front ends of the pair of front vertical partition plates 22 and the front reinforcing plate 23. The bracket 24 is a member having a cylindrical shape penetrating in the vertical direction. The working machine 221 is supported by the base plate 20 via the bracket 24.

[0020] <Swing motor> The slewing motor 30 is a hydraulically driven motor. The slewing motor 30 is positioned between a pair of front vertical partition plates 22 on the base plate 20 and is installed so as to penetrate the base plate 20. The rotation axis of the slewing motor 30 extends in the vertical direction. When the slewing motor 30 is driven by hydraulics, the driving force of the slewing motor 30 is transmitted to the swing circle 215 via a swing pinion (not shown). This causes the upper slewing body 220 to rotate relative to the lower traveling body 210.

[0021] <Hydraulic valve> The hydraulic valve 31 is located on the left side of the front vertical partition plate 22 in the front region F of the base plate 20. It distributes hydraulic fluid to various hydraulic cylinders and hydraulic equipment such as the swing motor 30.

[0022] <Oil Tank> The oil tank 32 is located in the right-hand portion of the front vertical partition plate 22 in the front region F of the base plate 20. The oil tank 32 stores the hydraulic fluid that is supplied to each hydraulic cylinder and hydraulic motor and other hydraulic equipment.

[0023] <Driving space> Above the front region F of the base plate 20, there is an operating space 40 as shown in Figure 3. The operating space 40 is the space where the operator sits and operates the electric hydraulic excavator 200. The operating space 40 is located in the left-leaning portion of the upper part of the upper rotating body 220.

[0024] The driving space 40 includes a floor panel 41, a driver's seat 42, an operating lever 45, an operating pedal 46, and a canopy 47. The floor panel 41 extends horizontally and forms the floor surface of the operating space 40. The floor panel 41 is positioned above the front region F of the base plate 20. The driver's seat 42 is the part in which the operator sits when operating the electric hydraulic excavator 200, and has a seat portion 43 and a backrest portion 44. The rear of the driver's seat 42 is located above the rear region R of the base plate 20. The operating space 40 can be tilted up around a rotation axis extending in the width direction, which is provided to connect the front of the slewing frame 10 and the front of the floor panel 41. That is, the operating space 40 rotates so as to tilt diagonally forward and upward relative to the slewing frame 10. As a result, the equipment installed inside the upper slewing body 220 is exposed to the outside. In other words, in this embodiment, the operating space 40 can be tilted up to provide easy access to the equipment.

[0025] The operating lever 45 is a lever operated by the operator and is located in front of the driver's seat 42. Multiple operating pedals 46 are provided at the front of the floor panel 41. The canopy 47 is provided to cover the driver's compartment 40 from above.

[0026] <Battery Unit> The battery unit 50 is the power source for the electric hydraulic excavator 200. As shown in Figures 2 to 6, the battery unit 50 is located in the rear region R of the base plate 20. The battery unit 50 is composed of multiple battery modules, each functioning as a battery, arranged integrally in the vertical, front-to-back, and left-to-right directions. The battery unit 50 as a whole has a rectangular parallelepiped shape.

[0027] The bottom surface of the battery unit 50 extends horizontally and rests on the base plate 20. The battery unit 50 is fixed to the base plate 20 by bolts (not shown). The rearward-facing back of the battery unit 50 extends in the vertical and horizontal directions and is positioned along the rear end of the base plate 20 in a plan view.

[0028] The pair of sides of the battery unit 50, facing in the width direction, extend in the front-to-back and up-to-down directions. The width dimension of the battery unit 50, i.e., the distance between the pair of sides, is smaller than the width distance of the base plate 20. As a result, the pair of sides of the battery unit 50 are positioned at a distance from the corresponding sides of the base plate 20.

[0029] The front of the battery unit 50, which faces forward, extends in the vertical and width directions and is positioned at a rearward distance from the lateral partition plate 21. As a result, a space is formed between the front of the battery unit 50 and the lateral partition plate 21. The front-to-rear dimension of the battery unit 50, that is, the distance between the front and rear of the battery unit 50, is smaller than the front-to-rear dimension of the rear region R. The top surface of the battery unit 50 extends horizontally. The height of the top surface of the battery unit 50 is positioned slightly below the seat portion 43 of the driver's seat 42.

[0030] <Battery Management System Unit> The battery management system unit 51 (not shown in Figure 2) is integrated with the battery unit 50, as shown in Figures 3 to 6. The battery management system unit 51 detects the charge status of each battery module of the battery unit 50 and performs optimal charge / discharge control and safety control.

[0031] The battery management system unit 51 is located on the upper left side (one side in the width direction) of the front of the battery. The battery management system unit 51 is rectangular in shape, and its top surface and left side are flush with the top surface and left side of the battery unit 50. The width and height dimensions of the battery management system unit 51 are smaller than those of the battery unit 50. The front of the battery management system unit 51 is located slightly behind the lateral partition plate 21. That is, the battery management system unit 51 is housed on the rear region R of the base plate 20. Below the battery management system unit 51, a space is formed that is partitioned by the battery unit 50, the lateral partition plate 21, and the battery unit 50.

[0032] <Cooling Unit> As shown in Figures 2 to 6, the cooling unit 60 is located in the rear region R on the base plate 20, in front of and to the right (on the other side in the width direction) of the battery unit 50. The cooling unit 60 does not overlap the battery unit 50 in the front or rear direction, but is located to the right of the battery unit 50, that is, along the right side of the base plate 20. The cooling unit 60 includes a cooling fan 61 and an oil cooler 62.

[0033] <Cooling fan> The cooling fan 61 is driven to rotate around an axis that extends in the width direction. When the cooling fan 61 is driven, air is blown out in the width direction, from right to left.

[0034] <Oil Cooler> The oil cooler 62 is integrally mounted to the left side of the cooling fan 61. The oil cooler 62 is a heat exchanger through which the hydraulic fluid discharged by the hydraulic pump 71 flows. The oil cooler 62 has a communication section formed in the width direction through which air flows. The hydraulic fluid is cooled by the air blown by the cooling fan 61 flowing through the communication section.

[0035] <Air-cooling components> The air-cooled component 70 is an assembly of various devices that require cooling by air. As shown in Figures 2 to 7, the air-cooled component 70 is located on the base plate 20, on the front side of the battery unit 50 and on one side in the width direction of the cooling unit 60.

[0036] More specifically, the air-cooling component 70 is positioned to overlap the cooling unit 60 when viewed from the width direction. The air-cooling component 70 is positioned to extend in the width direction into the space between the battery unit 50 and the front vertical partition plate 22. The air-cooling component 70 is positioned to penetrate in the width direction into the space below the battery management system unit 51. The air-cooling component 70 extends from a position to the left of the battery unit 50 to the right of the battery unit 50, up to the front of the cooling unit 60. That is, the air-cooling component 70 is positioned across the width direction of the battery unit 50, facing the battery unit 50.

[0037] The air-cooling component 70 is configured such that the hydraulic pump 71, electric motor 72, and controller unit 73 are arranged in a straight line from right to left, extending in the width direction.

[0038] <Hydraulic pump> The hydraulic pump 71 is rotationally driven to discharge the hydraulic fluid supplied from the oil tank 32. The hydraulic pump 71 is positioned so that its rotating shaft extends in the width direction. The hydraulic pump 71 is located in a position that does not overlap with the battery unit 50 when viewed from the front or rear direction, that is, to the left of the battery unit 50.

[0039] <Electric motor> The electric motor 72 is rotationally driven by supplied AC power, thereby rotating the integrally mounted hydraulic pump 71. The electric motor 72 is mounted such that its drive shaft extends in the width direction. That is, the drive shaft of the electric motor 72 and the rotation shaft of the hydraulic pump 71 are mounted coaxially. The electric motor 72 is fixed to the rear region R on the base plate 20 via a support part (not shown). The electric motor 72 is mounted in a position that overlaps with the left portion of the battery unit 50 when viewed from the front or rear direction.

[0040] As shown in Figure 2, an air intake port 20a is formed in the portion of the base plate 20 that overlaps the electric motor 72 in the vertical direction, and the air intake port 20 penetrates the base plate 20 vertically.

[0041] <Controller Unit> The controller unit 73 has an inverter that converts the DC power supplied from the battery unit 50 into AC power and outputs it to the electric motor 72. The controller unit 73 further has a contactor and other electrical equipment. In the controller unit 73, these electrical equipment is fixed to a heat sink having a cooling surface that extends in the width direction. For example, each electrical equipment may be mounted on the mounting surface opposite to the cooling surface of a pair of heat sinks having opposing cooling surfaces. The controller unit 73 is provided so as to partially overlap the right side of the battery unit 50 when viewed from the front or rear direction. The right end of the controller unit 73 is located to the right of the battery unit 50 and faces the cooling unit 60 in the width direction.

[0042] <Protector> As shown in Figures 3 and 4, a pair of protectors 80 are provided at the rear and lower corners of the upper rotating body 220, spaced apart in the width direction. The protectors 80 are made of a high-strength material such as steel. The protectors 80 are integrally fixed to the corners on both sides of the rear end of the base plate 20.

[0043] <Exterior cover> The exterior panel 90 is a cover that forms the outer shape of the upper rotating body 220. Various components of the upper rotating body 220 are housed inside the exterior panel 90. The exterior panel 90 has a rear cover 91, a left cover 92, and a right cover 93. The rear cover 91 forms the rear of the exterior panel 90. The left cover 92 forms the left portion of the exterior panel 90. The right cover 93 forms the right portion of the exterior panel 90. As shown in Figure 4, an opening 93a is formed in the right cover 93 that communicates with the right cover 93 in the width direction, at a location corresponding to the cooling fan 61 of the cooling unit 60, that is, at a position that overlaps with the cooling fan 61 when viewed from the width direction.

[0044] <Effects and Effects> When the electric hydraulic excavator 200 with the above configuration is in operation, DC power from the battery unit 50 is converted to AC power by the inverter of the controller unit 73 and supplied to the electric motor 72. This causes the electric motor 72 to rotate, which in turn rotates the hydraulic pump 71 and discharges hydraulic fluid from the oil tank 32. The hydraulic fluid discharged from the hydraulic pump 71 is supplied to hydraulic equipment such as the hydraulic cylinder and the swing motor 30 by the hydraulic valve 31, thereby operating the electric hydraulic excavator 200.

[0045] The hydraulic fluid used in each hydraulic device is cooled by the oil cooler 62 of the cooling unit 60 before being returned to the oil tank 32. Specifically, as the cooling fan 61 of the cooling unit 60 rotates, air flows through the oil cooler 62, and heat exchange occurs between the air and the hydraulic fluid, thereby cooling the hydraulic fluid.

[0046] In this case, when the electric hydraulic excavator 200 is in operation, it is necessary to cool the heat-generating air-cooled component 70. In this embodiment, the air-cooled component 70 is cooled by a cooling unit 60 whose primary purpose is to cool the hydraulic fluid in the oil cooler 62.

[0047] Specifically, as shown in Figures 2 and 6, when the cooling fan 61 rotates to expel the air inside the upper slewing body 220 to the outside, a negative pressure is created inside the upper slewing body 220, causing air to be introduced into the upper slewing body 220 through gaps in the exterior panel 90, etc. This creates an airflow inside the upper slewing body 220 that extends from left to right in the width direction. This air flows along the air-cooled component 70, sequentially cooling the hydraulic pump 71, electric motor 72, and controller. The air that has cooled these components passes through the oil cooler 62 and is then discharged outside the upper slewing body 220.

[0048] As described above, with the electric hydraulic excavator 200 of this embodiment, by arranging the air-cooled components 70 linearly in the direction of air flow by the cooling fan 61, various equipment can be cooled in conjunction with the cooling of the oil cooler 62. Therefore, various equipment can be efficiently cooled without the need to provide other fans or water cooling equipment for cooling the various equipment.

[0049] In conventional electric hydraulic excavators, the battery unit 50 was typically positioned along the front-to-rear direction of the rear region R of the base plate 20. In recent years, with the increasing density and miniaturization of battery modules, it has become possible to make the battery unit 50 more compact. In this embodiment, the battery unit 50 is positioned on the rear side of the rear region R of the base plate 20, creating a space on the front side of the rear region R. By arranging the air-cooling component 70, which consists of various devices, in this space, the rear region R of the base plate 20 is efficiently arranged.

[0050] In particular, the presence of a battery unit 50 protected by a robust housing behind the various components that make up the air-cooling component 70 ensures that the air-cooling component 70 is protected even if, for example, an unexpected impact is applied to the rear of the upper rotating body 220. That is, by positioning the battery unit 50 to cover the various components that make up the air-cooling component 70 from the rear, the various components, including electrical and precision equipment, can be protected, and the durability of these components can be improved.

[0051] Furthermore, by positioning the air-cooling component 70 in front of the battery unit 50, it is not necessary to place the various equipment for operating the electric hydraulic excavator 200 to the sides of the battery unit 50, i.e., on the right and left sides. Therefore, by removing a portion of the exterior panel 90 and tilting up the operating space 40 together with the floor panel 41, the air-cooling component 70, controller unit 73, electric motor 72, hydraulic pump 71, battery management system unit 51, and battery unit 50 can be accessed from both the front and the width. This makes it possible to improve the maintainability of each piece of equipment.

[0052] Furthermore, because the hydraulic pump 71, electric motor 72, and controller unit 73 are arranged in order from the upstream side of the airflow from the cooling fan 61, relatively cool, unheated air can be supplied to the hydraulic pump 71 and electric motor 72, which tend to get particularly hot. This makes it possible to achieve efficient cooling overall.

[0053] Furthermore, in this embodiment, when viewed from the front or rear, the hydraulic pump 71 and oil cooler 62 do not overlap with the battery unit 50. Therefore, even if the battery unit 50 moves forward from the base plate 20 due to an unexpected impact or the like, the battery unit 50 will not collide with the hydraulic pump 71, oil cooler 62, etc. Thus, serious malfunctions such as hydraulic fluid leakage can be avoided.

[0054] Furthermore, since an air intake port 20a is formed below the electric motor 72, fresh air introduced into the upper rotating body 220 from the air intake port 20a can be directly supplied to the electric motor 72. This promotes the cooling of the electric motor 72, which is the drive source of the electric hydraulic excavator 200, and improves energy efficiency.

[0055] Furthermore, by placing the battery management system unit 51 above the air-cooling component 70, the space can be used more effectively, and access to the battery management system unit 51 can be improved.

[0056] The various components of the air-cooling component 70 are positioned between the battery unit 50 and the lateral partition plate 21. In other words, the air-cooling component 70 is positioned along the lateral partition plate 21, which is a structural member of the swivel frame 10. Therefore, the effects of vibration and deflection of the base plate 20 on the components of the air-cooling component 70 can be minimized. This further improves the durability of the various components.

[0057] <Other Embodiments> Although embodiments of the present invention have been described above, the present invention is not limited thereto and can be modified as appropriate without departing from the technical spirit of the invention.

[0058] For example, although the cooling unit 60 in this embodiment is located at the downstream end of the airflow, it may also be located at the upstream end of the airflow; that is, it may be a suction-type cooling unit 60 rather than a blow-type cooling unit 60. Furthermore, the arrangement order in the width direction of the components constituting the air-cooling component 70 may be in any order other than the order in the embodiment.

[0059] In the embodiments described, an electric hydraulic excavator 200 was used as an example of an electric construction machine, but the invention is not limited to this. For example, the present invention may be applied to electric excavators or other electric construction machines in which the drives of work implements 221 and other components are also entirely electric. [Explanation of Symbols]

[0060] 10...Slewing frame 20...Base plate 20a...Air intake 21...Side partition plate 22...Front vertical partition plate 23...Front reinforcement plate 24...Bracket 30...Slewing motor 31...Hydraulic valve 32...Oil tank 40...Operating space 41...Floor panel 42...Driver's seat 43...Seat 44...Backrest 45...Operating lever 46...Operating pedal 47...Canopy 50...Battery unit 51...Battery management system unit 60...Cooling unit 61...Cooling fan 62...Oil cooler 70...Air-cooled components 71...Hydraulic pump 72...Electric motor 73...Controller unit 80...Protector 90...Exterior panel 91...Rear cover 92...Left cover 93...Right cover 93a...Opening 200...Electric hydraulic excavator 210...Lower running gear 211...Tracks 212...Blade 215...Swing circle 220...Upper rotating body 221...Work equipment 222...Boom 223...Arm 224...Bucket F...Front area R...Rear area

Claims

1. A base plate extending horizontally, A battery unit provided in the rear region on the base plate, A cooling unit comprising a cooling fan provided in front of the battery unit in the rear region and capable of blowing air in the width direction of the base plate, and an oil cooler provided in the width direction of the cooling fan, An air-cooling component having a plurality of devices arranged sequentially in the width direction of the cooling unit in the rear region, Equipped with, The air-cooling component comprises a plurality of devices, including a hydraulic pump, an electric motor, and a controller unit, which are arranged sequentially from one side to the other in the width direction. Of the hydraulic pump, electric motor, and controller unit, only the hydraulic pump is positioned so as not to overlap with the battery unit in the front or back. The base plate is further provided with a lateral partition plate that extends across the width direction of the base plate so as to protrude from the base plate, and divides the area on the base plate into a rear area on the rear side and a front area on the front side. The air-cooling component is provided so as to be sandwiched between the battery unit and the lateral partition plate in an electric construction machine.

2. The air-cooling components are arranged in front of the battery unit and on one side in the width direction of the cooling unit, extending across the width direction of the battery unit. The electric construction machine according to claim 1, wherein the cooling unit is provided on the other side in the width direction than the battery unit.

3. The aforementioned base plate is The electric construction machine according to claim 1 or 2, wherein the lower part of the electric motor has an air intake hole that penetrates the base plate vertically.

4. An electric construction machine according to any one of claims 1 to 3, further comprising a battery management system provided integrally with the battery unit so as to protrude forward from the top of the battery unit and covering at least a portion of the air-cooling component from above.

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