CN111194371A

CN111194371A - Electric construction machine

Info

Publication number: CN111194371A
Application number: CN201980000252.5A
Authority: CN
Inventors: 高野善之; 和岛纱友实; 渡边馨
Original assignee: Komatsu Ltd
Current assignee: Komatsu Ltd
Priority date: 2018-09-14
Filing date: 2019-01-24
Publication date: 2020-05-22
Anticipated expiration: 2039-01-24
Also published as: DE112019000003T5; JP2020045631A; WO2020054092A1; JP7175145B2; CN111194371B

Abstract

The electric construction machine is provided with: a battery unit that accommodates a battery constituting a battery circuit; an inspection plug which protrudes outward from the battery unit and cuts off the battery circuit by being pulled out; and an exterior cover which covers the battery cell while exposing the service plug to the outside and has a pressing portion to which the service plug is pressed from the outside.

Description

Electric construction machine

Technical Field

The present invention relates to an electric construction machine.

This application claims priority to Japanese application laid out in Japanese application No. 2018-172708, 9, 14, 2018, the contents of which are incorporated herein by reference.

Background

Patent document 1 discloses an electric hydraulic excavator as an example of an electric construction machine. An electric hydraulic excavator includes an electric motor driven by a battery instead of an engine of a conventional hydraulic excavator.

A battery unit having a plurality of batteries is provided in an upper revolving structure of an electric hydraulic excavator. The battery cell is covered with an exterior cover.

Patent document 2 discloses a hydraulic excavator. Various devices are disposed in an upper revolving body of the hydraulic excavator, and these devices are covered with an exterior cover. The exterior cover is provided to be rotatable. By rotating the entire exterior cover, the operator can access the internal devices.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2012-102502

Patent document 2: japanese patent laid-open No. 2005-343382

Disclosure of Invention

Technical problem to be solved by the invention

In the battery unit of the electric construction machine, a high-voltage battery circuit is formed by electrically connecting a plurality of batteries. In addition, high-voltage equipment such as high-voltage cables and inverters is also constructed. Therefore, when the exterior cover is opened to maintain the battery cell and the high-voltage device, it is preferable to further ensure the safety of the operator.

The present invention has been made in view of the above-described problems, and an object thereof is to provide an electric construction machine capable of further improving safety during maintenance.

Means for solving the problems

An electric construction machine according to an aspect of the present invention includes: a battery unit that accommodates a battery constituting a battery circuit; a service plug protruding outward from the battery unit and cutting off the battery circuit by being pulled out; and an exterior cover that covers the battery cell while exposing the service plug to the outside, and that has a pressing portion that is pressed from the outside by the service plug.

Effects of the invention

According to the electric construction machine of the above aspect, safety during maintenance can be further improved.

Drawings

Fig. 1 is a side view of an electric hydraulic excavator according to an embodiment of the present invention.

Fig. 2 is a schematic plan view showing an internal structure of an upper revolving structure of an electric hydraulic excavator according to an embodiment of the present invention.

Fig. 3 is a left side view showing an internal structure of an upper revolving structure of an electric hydraulic excavator according to an embodiment of the present invention.

Fig. 4 is a rear view of an upper revolving structure of the electric hydraulic excavator according to the embodiment of the present invention.

Fig. 5 is a view showing a state where the lid portion is removed from fig. 4.

Fig. 6 is a cross-sectional view VI-VI of fig. 5.

Fig. 7 is a diagram of a state in which the plug main body is removed from the plug connector in fig. 6.

Fig. 8 is a view showing a state where the plug main body and the center panel are removed from fig. 5.

Fig. 9 is a view showing a state where the side cover is removed from fig. 8.

Fig. 10 is a view of the upper cover removed from fig. 9.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to fig. 1 to 5.

< electric Hydraulic shovel (electric construction machine) >

As shown in fig. 1, an electric hydraulic excavator 200, which is an example of an electric construction machine, includes a lower traveling structure 210 and an upper revolving structure 220. Hereinafter, a direction in which gravity acts in a state in which the electric hydraulic excavator 200 is installed on a horizontal plane is referred to as an up-down direction.

< lower traveling body >

Lower carrier 210 has a pair of crawler belts 211. These crawler belts 211 are driven by a hydraulic motor for traveling (not shown), so that the lower traveling body 210 travels. The traveling direction of the lower traveling structure 210 is referred to as the front-rear direction, the front side in the traveling direction (the side where the below-described blade 212 is provided in the normal traveling direction) is referred to as the front, and the rear side in the traveling direction, which is the opposite side of the front side, is referred to as the rear. The right direction when viewed in the forward direction is referred to as "right", and the left direction when viewed in the forward direction is referred to as "left". The crawler belts 211 are provided in a pair on the left and right.

A scraper 212 as a soil discharging plate extending in the vehicle width direction (hereinafter, simply referred to as the width direction) of the lower traveling structure 210 is provided at the front portion of the lower traveling structure 210. The height position of the blade 212 can be adjusted by driving the blade 212 with a hydraulic cylinder.

< upper slewing body >

The upper revolving structure 220 is provided on the lower traveling structure 210. The upper revolving structure 220 is connected to the lower traveling structure 210 via a revolving ring 215. The swivel ring 215 has an annular shape centered on a swivel axis extending in the vertical direction. The upper revolving structure 220 is able to revolve around the revolving axis with respect to the lower traveling structure 210 by the revolving ring 215.

As shown in fig. 1 to 4, the upper revolving structure 220 includes a work implement 221, an operation space 80, a revolving plate 10, a door frame 20, a battery unit 31, various devices, a protector 95, an inspection plug 140, and an exterior cover 100.

< working device >

As shown in fig. 1, the work implement 221 includes a large arm 222, a small arm 223, and a bucket 224. Work implement 221 performs various operations such as excavation by driving boom 222, boom 223, and bucket 224 with the respective hydraulic cylinders. Hereinafter, the width direction of the upper revolving structure 220 in a state where the work implement 221 is directed forward of the electric hydraulic excavator 200 will be simply referred to as "width direction". A direction toward the center in the width direction is referred to as "inside in the width direction", and a direction toward the left side (one side in the width direction) or the right side (the other side in the width direction) from the center in the width direction is referred to as "outside in the width direction".

< Driving space >

The driving space 80 is a portion on which an operator gets and operates the electric hydraulic excavator 200 by the operator. As shown in fig. 1, the driving space 80 is provided in a front portion of the upper revolving structure 220 and in an upper left portion thereof.

The cab space 80 includes a floor panel 81 forming a floor surface, and a cab 84 provided behind and above the floor panel 81. In addition, a control box in which a controller and the like are housed, various levers, and pedals are provided in the driving space 80. The driving space 80 is covered with a ceiling 90 at the upper side. The rear portion of the ceiling 90 is fixed to the upper end of the gate frame 20.

< rotating plate >

As shown in fig. 2, the pivoting plate 10 has a bottom plate 11, a lateral partition plate 12, a front longitudinal partition plate 13, a front reinforcing plate 14, a bracket 15, and a rear longitudinal partition plate 16.

< bottom plate >

The bottom plate 11 is a plate-like member extending in the horizontal direction. That is, the bottom plate 11 extends in the front-rear direction and the width direction. The bottom plate 11 may be formed of one steel plate or a combination of a plurality of steel plates. The lower surface of the base plate 11 is fixed to the swivel ring 215. Thereby, the swivel plate 10 is supported from below by the swivel ring 215.

< horizontal partition plate >

The transverse partition plate 12 is a plate-like member that protrudes upward from the upper surface of the bottom plate 11 and extends in the width direction. The transverse partition plate 12 extends with the width direction as the longitudinal direction. The horizontal partition plate 12 is disposed in a portion of the bottom plate 11 on the front side of the center in the front-rear direction. The transverse partition plate 12 extends across both ends, i.e., both right and left ends, in the width direction of the bottom plate 11.

< front longitudinal partition plate >

The front longitudinal partition plate 13 is a plate-like member that protrudes from the upper surface of the bottom plate 11 and extends in the front-rear direction. A pair of front longitudinal partition plates 13 are provided on the upper surface of the bottom plate 11 in the width direction at positions apart from each other on the front side of the lateral partition plate 12. That is, a pair of front vertical partition plates 13 is provided at a left-right interval. The pair of front vertical partition plates 13 are disposed on the inner side in the width direction than the end portions on both sides in the width direction of the bottom plate 11.

In the front vertical partition plate 13, the rear end is connected to the front surface of the horizontal partition plate 12. That is, the front vertical partition plate 13 is provided so as to extend forward from the lateral partition plate 12. As shown in fig. 2, the pair of front vertical partition plates 13 are provided so as to approach each other from the rear end portion, which is a connection portion with the horizontal partition plate 12, toward the front side.

< front reinforcing plate >

The front reinforcing plate 14 is integrally fixed to the pair of front longitudinal partition plates 13 at the front portions of the pair of front longitudinal partition plates 13. The front reinforcing plate 14 has a shape in which the distance in the width direction becomes smaller toward the front in a plan view, corresponding to the arrangement of the pair of front longitudinal partition plates 13.

< bracket >

The bracket 15 is fixed to the front ends of the pair of front longitudinal partition plates 13 and the front reinforcing plate 14. The work device 221 is supported by the base plate 11 via a bracket 15.

< rear longitudinal partition plate >

Rear vertical dividing plate 16 is a plate-like member that protrudes from the upper surface of bottom plate 11 and extends in the front-rear direction. A pair of rear vertical dividing plates 16 are provided on the upper surface of the bottom plate 11 at the rear side of the horizontal dividing plate 12 so as to be separated from each other in the width direction. That is, the rear vertical dividing plate 16 is provided in a pair on the left and right. The widthwise interval of the pair of rear longitudinal partition plates 16 is larger than the widthwise interval of the front longitudinal partition plates 13 at the rear ends of the pair of front longitudinal partition plates 13.

< door type frame >

As shown in fig. 2 and 3, the gate frame 20 is fixed to the base plate 11. The gate frame 20 includes a pair of pillar portions 21 and a beam portion 22.

< pillar part >

The pair of column portions 21 is provided on the bottom plate 11 at a position rearward of the lateral partition plate 12 and outward in the width direction of the rear vertical partition plate 16 so as to be separated in the width direction. The column portion 21 extends in the vertical direction, and the lower end thereof is fixed to the bottom plate 11.

< Beam section >

The beam portion 22 extends in the width direction across the upper ends of the pair of pillar portions 21. Beam 22 is provided above and spaced apart from the upper surface of base plate 11. The pair of pillar portions 21 and the beam portion 22 are fixed integrally. The gate frame 20, which is an integral structure of the pair of pillar portions 21 and the beam portions 22, has an inverted U-shape when viewed from the front-rear direction. The gate frame 20 is fixed to the bottom plate 11 at a position toward the right.

< cell >

The battery unit 31 is a power source of the electric hydraulic excavator 200. As shown in fig. 2 and 4, the battery unit 31 is provided near the center of the rear portion on the bottom plate 11. The battery unit 31 of the present embodiment is assembled by stacking a plurality of (four in the present embodiment) battery modules 32 in the vertical direction.

Each battery module 32 has a rectangular frame shape extending in the front-rear direction and the width direction in plan view. In the battery module 32, a plurality of batteries are arranged in a horizontal direction. The batteries are electrically connected throughout the battery unit 31, thereby constituting a battery circuit. A sensor case 34 is provided at the rear of the battery pack 32 so as to project rearward. The sensor case 34 has a box shape extending in the width direction. Various sensors, contactors, and the like are housed inside the sensor box 34.

The battery modules 32 are integrally stacked one on top of another so that their side surfaces coincide with each other. The side surfaces 31a of the battery cells 31 are formed by the side surfaces of the plurality of battery packs 32. The first front surface 31b of the battery unit 31 is formed by the front surface of the battery assembly 32 except the uppermost portion. The front surface of the uppermost battery assembly 32 is set as the second front surface 31c of the battery cell 31. The second front surface 31c is located rearward of the first front surface 31 b.

The front portion of the upper surface of the second battery module 32 is not stacked on the uppermost battery module 32, but is exposed upward. This portion is closed by a first lid 31f provided with a fan not shown.

The upper surface of the uppermost battery module 32 is closed by a second lid 31g provided with a fan not shown.

In the battery unit 31, the air flowing in from below the lowermost battery module 32 flows upward while cooling the battery. The air is discharged to the outside of the battery cell 31 through fans provided in the first lid 31f and the second lid 31 g.

The left and right ends of the lower surface of battery unit 31 are fixed to rear longitudinal partition plate 16. As shown in fig. 2, in the battery unit 31, only the front portion of the battery unit 31 is disposed on the front side of the door frame 20 in the inverted U shape by passing through the inside of the door frame 20, and the front portion of the battery unit 31 is constituted by the front portions of the plurality of battery modules 32 excluding the uppermost battery module 32.

< various devices >

The following various devices are arranged in the upper slewing body 220.

As shown in fig. 2 and 4, the inverter 36 is provided on the second lid portion 31g of the battery unit 31 via a frame-shaped bracket 36a (not shown in fig. 2). The inverter 36 converts the dc power supplied from the battery unit 31 into ac power.

As shown in fig. 2 and 4, the power transmission unit 37 is provided on the right side of the battery unit 31 on the bottom plate 11. The power transmission unit 37 supplies the dc power charged in the battery unit 31 to the inverter 36. That is, the inverter 36 is supplied with dc power from the battery unit 31 via the power transmission unit 37. The power transmission unit 37 is provided with various electrical devices such as a contactor, a DC-DC converter, and an in-vehicle charger.

As shown in fig. 2 to 4, the charging connector connecting portion 38 is provided on the battery unit 31. The charging connector connecting portion 38 is fixed to a bracket 36a fixed to the second lid portion 31g of the battery unit 31, similarly to the inverter 36. The charging connector connecting portion 38 is disposed directly above the sensor case 34.

The electric motor 39 is driven by the ac power supplied from the inverter 36. As shown in fig. 2 and 4, the electric motor 39 is provided on the bottom plate 11 on the left side of the battery unit 31. The electric motor 39 is provided with a drive shaft extending in the front-rear direction. The electric motor 39 is provided with a drive shaft extending in the front-rear direction. In the plan view shown in fig. 2, the end surface of the electric motor 39 on the front side is located on the rear side of the left bracket 25.

The hydraulic pump 51 is driven in accordance with the rotation of the drive shaft of the electric motor 39, and discharges the hydraulic oil. As shown in fig. 2, the hydraulic pump 51 is provided on the base plate 11 in front of the electric motor 39 and near the front-rear position of the cross partition plate 12.

As shown in fig. 2, the hydraulic valve 52 is provided on the bottom plate 11 on the left side of the front longitudinal partition plate 13 and on the front side of the lateral partition plate 12. The hydraulic valve 52 distributes the hydraulic oil discharged from the hydraulic pump 51 to various hydraulic devices such as hydraulic cylinders.

The operation mode switching unit 53 is connected to the hydraulic valve 52, and the operation mode switching unit 53 changes the distribution target to which the hydraulic valve 52 distributes the hydraulic oil by changing the setting by the maintenance operator. This changes the hydraulic cylinder that can be operated by various joystick operations of the driver. As shown in fig. 2, the operation mode switching portion 53 is disposed on the left side (outer side in the width direction) of the hydraulic valve 52 in a plan view.

The swing motor 70 is a hydraulically driven motor, and is rotationally driven by hydraulic oil supplied from the hydraulic valve 52. The turning motor 70 is provided at a position between the pair of front vertical partition plates 13 in the bottom plate 11 so as to penetrate the bottom plate 11. The drive force of the swing motor 70 is transmitted to the swing ring 215 via a swing pinion gear not shown by driving the swing motor 70 by hydraulic pressure. Thereby, the upper revolving structure 220 is driven to revolve with respect to the lower traveling structure.

As shown in fig. 2, the cooling unit 61 is provided in a region on the front side of the horizontal partition plate 12 and on the right side of the right front vertical partition plate. The cooling unit 61 includes a cooling fan 62 driven to rotate and a heat exchanging portion 63 including a radiator and an oil cooler.

As shown in fig. 2, the auxiliary battery 64 is provided below the cooling unit 61 on the bottom plate 11. The auxiliary battery 64 supplies electric power to auxiliary devices such as lamps and various controllers. The auxiliary battery 64 is charged via the DC-DC converter of the power transmission unit 37.

As shown in fig. 2, the oil tank 65 is disposed in front of the cooling unit 61. The tank 65 stores hydraulic oil supplied to the hydraulic pump 51.

< first electric device, second electric device >

Here, among the various devices described above, the power transmission unit 37 and the electric motor 39 are used as the first electrical device. The inverter 36 is used as the second electrical device. The second electrical device may also be maintained less frequently than the first electrical device. That is, the frequency of maintenance and inspection such as component replacement and component repair of the inverter 36 as the second electrical device may be lower than that of the power transmission unit 37 and the electric motor 39 as the first electrical device.

< protective part >

As shown in fig. 1 and 5, the protector 95 is provided in a pair at two corners of the rear and lower portion of the upper revolving structure 220 with a gap therebetween in the width direction. The protector 95 is formed of a high-strength member such as a steel material. The protector 95 is integrally fixed to the corners of both sides of the rear end of the base plate 11 and extends upward. The protector 95 extends from the rear and in the width direction at the corner of the bottom plate 11 so as to cover the area on the bottom plate 11.

As shown in fig. 9 and 10, the protector 95 is provided at a position overlapping the electric motor 39 when viewed from the rear side. The vertical range of the protector 95 overlaps with the vertical range of the electric motor 39. The protector 95 is provided in a range in which the electric motor 39 is exposed outward in the width direction. In the case of a rear collision when the upper slewing body 220 is slewing, the upper slewing body 220 is protected from impact.

< maintenance plug >

As shown in fig. 2 and 3, the service plug 140 is provided to protrude rearward from the battery unit 31. The service plug 140 of the present embodiment protrudes rearward from the sensor case 34 provided at the rear of the uppermost battery pack 32 of the battery units 31. As shown in fig. 6 and 7, the service plug 140 includes a plug connector 141 and a plug main body 142.

The plug connector 141 includes a base portion 141a provided inside the sensor case 34, and a projection portion 141b that projects rearward (outward of the battery unit 31) from the base portion 141a through the outer surface of the sensor case 34. In the plug connector 141, a wiring connected in series with the battery circuit is provided. The end surfaces of the wiring on the rear side of the convex portion 141b are exposed as a pair of terminals T.

The plug main body 142 has a bottomed cylindrical shape into which the plug connector 141 is fitted from the rear side. An end surface of the plug main body 142 on the front side (inside the battery cell 31) is a contact surface 142a facing the base portion 141a of the plug connector 141 with a gap.

The bottom surface inside the plug main body 142 contacts the end surface of the projection 141b in the plug connector 141. A connection wiring W is provided on the bottom surface of the plug main body 142. The connection wiring W electrically connects the pair of terminals T exposed to the rear end surface of the convex portion 141b in a state where the plug main body 142 is fitted into the plug connector 141. This ensures the conduction of the battery circuit. On the other hand, as shown in fig. 7, the plug main body 142 is pulled out rearward, whereby the connection wires W are separated from the pair of terminals T. Thereby, the conduction of the battery circuit between the pair of terminals T is cut off.

< cover >

As shown in fig. 3 and fig. 8 to 10 (not shown in fig. 2), the cover 150 covers the service plug 140 and the sensor case 34 from above inside the exterior cover 100. The cover 150 is provided below the charging connector connection portion 38. The cover 150 is fixed to the upper portion of the battery cell 31. The cover 150 protrudes rearward from the battery cell 31 and then extends downward. The lower end of the cover 150 is located at the vertical position of the sensor case 34 of the second battery cell 31 from the top. The cover 150 is formed so as to surround the sensor case 34 from both sides in the width direction. As shown in fig. 8 to 10, in cover 150, a cutout portion 150a extending upward from the lower end of cover 150 is formed in a range where inspection plug 140 is disposed so as not to hinder access to inspection plug 140 from the rear side.

< exterior cover >

As shown in fig. 1, exterior cover 100 is a cover that forms the outer shape of upper revolving unit 220. Various devices of upper revolving unit 220 are housed inside exterior cover 100.

Exterior cover 100 includes left cover 120, right cover 130, and rear cover 170.

As shown in fig. 1 and 2, the left cover 120 forms a left portion of the exterior cover 100. As shown in fig. 2, the left cover 120 covers the hydraulic pump 51, the hydraulic valve 52, and the operation mode switching unit 53 from the left side.

As shown in fig. 2, right cover 130 forms the right portion of exterior cover 100. The right cover 130 covers the cooling unit 61, the auxiliary battery 64, and the oil tank 65. The right cover 130 is formed with an intake hole (not shown) for introducing air into the cooling unit 61 and an exhaust hole (not shown) for discharging air having passed through the cooling unit 61.

< rear cover >

As shown in fig. 1 and 5, rear cover 170 forms the rear portion of exterior cover 100. As shown in fig. 2, the rear cover 170 covers a region on the bottom plate 11 on the rear side of the gate frame 20 so as to house the battery unit 31, the inverter 36, the power transmission unit 37, the charging connector connection portion 38, and the electric motor 39.

As shown in fig. 4, the rear cover 170 is composed of outer panels, i.e., a center panel 171, a pair of side panels 172, an upper panel 173, and a lower panel 174.

< center panel >

The center panel 171 constitutes a center portion of the rear portion in the rear cover 170. The center panel 171 extends in the vertical direction and the width direction, and has a rectangular shape when viewed from the rear side. Both sides in the width direction of the lower end of the center panel 171 are in contact with the protector 95. Center panel 171 is fixed to a pillar (not shown) in exterior cover 100, for example, via a plurality of bolts 171 a.

As shown in fig. 5, a recess 171b formed by recessing a part of the center panel 171 toward the front side is provided in a position corresponding to the service plug 140 in the center panel 171 when viewed from the rear side. As shown in fig. 6 and 7, a through hole 171d that penetrates the center panel 171 in the front-rear direction is formed in the bottom surface (the surface facing the rear side) of the recess 171 b. The plug connector 141 of the service plug 140 is inserted into the through hole 171d from the front side to the rear side. That is, the center panel 171 exposes the service plug 140 to the outside.

The bottom surface of the recess 171b is a pressing portion 171c that abuts against the abutment surface 142a of the plug main body 142 attached to the plug connector 141 from the rear side. In the present embodiment, the back surface of the pressing portion 171c in the center panel 171 abuts against the surface facing the rear side in the base portion 141a of the plug connector 141. That is, the periphery of the through hole 171d in the center panel 171 is sandwiched between the plug connector 141 and the plug main body 142.

As shown in fig. 4, the recess 171b in the center panel 171 is closed from the rear side by the cover 170 a. The cover 170a is integrally fixed to the center panel 171 by a plurality of bolts 170 b. The bolt 170b is preferably of a special shape that cannot be tightened and removed with a common tool.

< side panel >

As shown in fig. 4 and 5, the pair of side panels 172 form portions on both sides in the width direction of the rear cover 170. The side panel 172 covers the space above the bottom plate 11 from the width direction outside. The left side panel 172 of the pair of left and right side panels 172 covers the left side surface 31a of the battery unit 31 and the electric motor 39. The right side surface 31a of the battery unit 31 and the power transmission unit 37 are covered with the right side panel 172 of the pair of left and right side panels 172.

The lower end of the rear portion of the side panel 172 is connected to the protector 95. The lower end of the front portion of the side panel 172 meets the bottom plate 11. The widthwise inner portion of the side panel 172 is covered from the rear side by the widthwise outer end of the center panel 171.

Side panel 172 is fixed to a support (not shown) in exterior cover 100 via bolt 172 a. The bolt 172a is provided in a portion of the side panel 172 covered by the center panel 171. Therefore, the bolts 172a for fixing the side panels 172 are also covered by the center panel 171 from the outside.

< Upper Panel >

The upper panel 173 constitutes an upper portion of the rear cover 170. The upper panel 173 is provided above the center panel 171 and between the pair of side panels 172. The upper panel 173 covers the upper portion of the battery unit 31, the charging connector connection portion 38, and the inverter 36 from above. The rear end of the upper panel 173 meets the upper end of the center panel 171 in the entire width direction. The widthwise outer end of the upper panel 173 is entirely covered from the outside by the widthwise inner end of the upper portion of the side panel 172 in the front-rear direction. Upper panel 173 is fixed to a structure in exterior cover 100 of upper revolving unit 220 via a bolt not shown.

An opening/closing portion 173a is provided at a rear and central portion of the upper panel 173 so as to be rotatable about an axis extending in the width direction at an upper portion of the upper panel 173. In a normal state, the closed opening/closing portion 173a is fixed by the lock portion 173b so as not to be opened. When a predetermined key is inserted into the lock portion 173b and rotated, the opening/closing portion 173a can be rotated about the axis to be opened. This allows the operator to access the charging connector connecting portion 38 in the exterior cover 100.

An elastic member (not shown) such as rubber is provided over the entire region in the front-rear direction in a portion between the upper panel 173 and the side panel 172, that is, a portion of the upper panel 173 covered by the side panel 172. This prevents water from entering the rear cover 170 from between the upper panel 173 and the side panel 172.

In this way, exterior cover 100 of the present embodiment has a structure in which center panel 171, side panel 172, and upper panel 173 are arranged in this order. The second side panel 172 of the array is partially covered by the center panel 171, which is the front-most exterior panel. The third upper panel 173 is covered with the side panel 172 from the outside.

< lower panel >

The lower panel 174 is disposed below the center panel 171 and between the pair of protectors 95. The upper end of the lower panel 174 extends in the width direction. The upper end of the lower panel 174 is covered from the outside by the lower portion of the center panel 171 over the entire width direction. The lower panel 174 is fixed to a fixing piece, not shown, in the protector 95 via a bolt 174 a.

Thus, lower panel 174 is disposed below center panel 171, and is partially covered by center panel 171, which is the front-most exterior panel.

< action Effect >

In the electric hydraulic excavator 200 having the above-described configuration, when the operator performs maintenance on the battery unit 31, the exterior cover 100 and the protector 95 are removed in the following order. When the entire exterior cover 100 is removed, the exterior panels arranged in sequence are removed in sequence from the front.

First, bolts 170b of lid 170a of exterior cover 100 shown in fig. 4 are removed, and lid 170a is removed from rear cover 170. As a result, as shown in fig. 5 and 6, the plug main body 142 of the service plug 140 is exposed outward. That is, the exterior cover 100 covers the battery cell 31 and the like and exposes the service plug 140 to the outside.

In this state, as shown in fig. 6, the pressing portion 171c of the center panel 171 abuts against the abutment surface 142a of the plug main body 142 of the service plug 140. Therefore, the pressing portion 171c of the center panel 171 is pressed by the contact surface 142a of the plug main body 142, and the center panel 171 cannot be removed.

Next, as shown in fig. 7, plug main body 142 of service plug 140 is pulled out rearward. Thereby, the battery circuit is cut off, and the battery unit 31 is in a non-energized state. The center panel 171 can be removed by removing the plug main body 142 and releasing the state of pressing the center panel 171 by the plug main body 142.

Thereafter, the bolt 171a is removed to release the fixed state of the center panel 171, and the center panel 171 is removed. Thus, the inner portions 172b in the width direction of the pair of side panels 172 covered by the center panel 171 are opened, and the side panels 172 can be removed. Subsequently, the bolt 172a is removed to release the fixed state of the side panel 172, and the side panel 172 is removed.

By removing the side panel 172, the portions 173c on both sides in the width direction of the upper panel 173 covered by the side panel 172 are opened. Thereby, the upper panel 173 can be removed. The upper panel 173 is removed by removing a bolt not shown to release the fixed state of the upper panel 173.

By removing the first center panel 171, the upper end portion 174b of the lower panel 174 covered with the center panel 171 is also opened. Thereby, the lower panel 174 can be removed. The lower panel 174 is removed by removing the bolt 174a to release the fixed state of the lower panel 174. Next, the protector 95 is removed, whereby the entire battery cell 31 is opened. This enables the operator to perform operations such as maintenance of the entire battery unit 31 and replacement of the battery unit 31.

As described above, according to the electric hydraulic excavator 200 of the present embodiment, the exterior cover 100 cannot be removed unless the plug main body 142 of the service plug 140 that cuts the battery circuit of the battery unit 31 is removed. Therefore, it is possible to prevent an operator from inadvertently touching the high-voltage circuit, and to further improve the safety of the operator when maintaining the battery unit 31.

The battery unit 31 may be large in size due to the accommodation of a plurality of batteries, and the exterior cover 100 covering the battery unit 31 may also be large in size. In the present embodiment, rear cover 170 of exterior cover 100 covering battery cell 31 is formed of a plurality of exterior panels, i.e., center panel 171, side panels 172, upper panel 173, and lower panel 174. By dividing the rear cover 170 into a plurality of exterior panels in this manner, the entire weight of the rear cover is distributed to the exterior panels. Therefore, by sequentially removing the exterior panels, the removal operation of the rear cover 170 can be easily performed without imposing a large burden on the operator.

The plurality of exterior panels starts to be in a removable state after the exterior panel in the front row is removed. In particular, in the present embodiment, the other exterior panels can be removed only after the center panel 171 is removed. Therefore, even if the rear cover 170 is divided into a plurality of exterior panels, the exterior panels can be removed only after the plug main body 142 of the service plug 140 is pulled out to ensure the safety of the battery cell 31. This can achieve both easy detachment of the rear cover 170 and safety of work.

In the present embodiment, the power transmission unit 37 and the electric motor 39, which are the first electrical devices, can be accessed by removing the side panel 172 after removing the center panel 171. Then, by removing the center panel 171 and the side panels 172 and then removing the upper panel 173, the inverter 36 as the second electrical device can be accessed.

From the viewpoint of safety of the operator, it is not preferable that the battery unit 31 can be freely accessed from various directions even if the battery circuit is disconnected. In the present embodiment, the order of removing the exterior panel covering the equipment is set according to the maintenance frequency of the equipment. Therefore, the chance of the battery cell 31 being exposed to the outside unintentionally can be suppressed, and safety and workability can be achieved.

Here, when the battery unit 31 is charged, the opening/closing portion 173a of the upper panel 173 is opened. Thereby, the charging connector connecting portion 38 is exposed to the outside and can be charged. Also, by externally connecting a charging connector to the charging connector connection portion 38, the electric power from the charging connector is charged to the battery unit 31 via the power transmission unit 37.

In the present embodiment, a cover 150 that covers the service plug 140 and the sensor box 34 from above is provided inside the exterior cover 100. Thus, even when the upper panel 173 is opened during charging such as in rainy weather, water from above can be prevented from entering the service plug 140 and the sensor case 34. This can further ensure safety.

< other embodiments >

The embodiments of the present invention have been described above, but the present invention is not limited to these embodiments, and can be modified as appropriate within a range not departing from the technical spirit of the present invention.

In the embodiment, the center panel 171 can be removed by pulling out the service plug 140. However, the direction in which the service plug 140 protrudes from the battery cell 31 is not limited to this, and the service plug 140 may be configured to be freely protruded from the battery cell 31, or an exterior panel at a position corresponding to the service plug 140 may be detachable.

In the embodiment, the side panels 172, the lower panel 174, and the upper panel 173 can be removed when the center panel 171 is removed, but the present invention is not limited to this. If the exterior cover 100 is formed of a plurality of exterior panels, one exterior panel can be removed by pulling out the service plug 140, and another exterior panel can be removed when this is the case.

The structure of the service plug 140 may be any structure, not only the structure described in the embodiment, but also any structure that cuts the battery circuit by pulling out the plug. The structure of the service plug 140 may be any structure as long as the restriction state of the pressing portion 171c of the exterior cover 100 is released by pulling out the plug body 140.

In the embodiment, the center panel 171, the side panels 172, and the upper panel 173 are configured to be sequentially detachable, but the present invention is not limited thereto as long as a plurality of exterior panels are configured to be sequentially detachable.

In the embodiment, the example in which the power transmission unit 37 and the electric motor 39 are provided as the first electrical device and the inverter 36 is provided as the second electrical device has been described, but various devices other than these may be provided.

In the embodiment, the description has been given of the electric hydraulic excavator 200 as an example of the electric construction machine, but the present invention is not limited thereto. The invention can also be applied to other electrically powered construction machines that are driven by batteries.

Industrial applicability

According to the electric construction machine of the present invention, the safety during maintenance can be further improved.

Description of the reference numerals

10 swing plate, 11 bottom plate, 12 cross partition plate, 13 front longitudinal partition plate, 14 front reinforcing plate, 15 bracket, 16 rear longitudinal partition plate, 20 door type frame, 21 pillar portion, 22 beam portion, 25 left bracket, 26 right bracket, 31 battery unit, 31a side surface, 31f first cover portion, 31g second cover portion, 32 battery pack, 34 sensor box, 36 inverter, 36a bracket, 37 power transmission unit, 38 charging connector connection portion, 39 electric motor, 51 hydraulic pump, hydraulic valve 52, 53 operation mode switching portion, 61 cooling unit, 62 cooling fan, 63 heat exchanging portion, 64 auxiliary battery, 65 oil tank, 70 swing motor, 80 driving space, 81 floor panel, 84 driver's seat, 90 roof, 95 protector, 100 outer cover, 120 … left cover, 130 … right cover, 140 … service plug, 141 … plug connector, 141a … base, 141b … convex portion, 142 … plug body, 142a … contact surface, 150 … cover, 150a … notched portion, 170 … rear cover, 170a … cover portion, 170b … bolt, 171 … center panel, 171a … bolt, 171b … concave portion, 171c … pressing portion, 171d … through hole, 172 … side panel, 172a … bolt, 173 … upper panel, 173a … opening and closing portion, 173b … lock portion, 174 … lower panel, 174a … bolt, 200 … electric hydraulic excavator, 210 … lower traveling bucket body, 211 …, 212 …, 215 … revolving ring, 220 … upper revolving body, 221 … working device, 222 … large arm, 223 … small arm, 224.

Claims

1. An electric construction machine is characterized by comprising:

a battery unit that accommodates a battery constituting a battery circuit;

a service plug protruding outward from the battery unit and cutting off the battery circuit by being pulled out;

and an exterior cover that covers the battery cell while exposing the service plug to the outside, and that has a pressing portion that is pressed from the outside by the service plug.

2. The electric construction machine according to claim 1,

the exterior cover has a plurality of exterior panels arranged in sequence,

the exterior panels other than the front-most exterior panel are partially covered from the outside by the front-most exterior panel of the exterior panel,

the pressing portion is provided on the front outer panel.

3. The electric construction machine according to claim 1 or 2,

the service plug protrudes rearward from the battery cell,

the front-most exterior panel is a center panel covering the battery cells from behind,

the electric construction machine further includes a first electric device provided on the bottom plate on the outer side in the width direction of the battery unit,

the second exterior panel from the front is a side panel that covers the battery cell and the first electrical device from the outside in the width direction of the bottom plate.

4. The electric construction machine according to claim 3,

the electric construction machine further includes a second electric device provided on the battery unit,

the third exterior panel from the front is an upper panel that covers the battery unit and the second electrical device from above.

5. The electric construction machine according to any one of claims 1 to 4,

the electric construction machine further includes a charging connector connecting portion provided on the battery unit and externally connected to a charging connector,

the exterior cover has an opening/closing portion for exposing the charging connector to the outside by opening the opening portion,

the service plug is positioned below the opening and closing part,

the electric construction machine further includes a cover that covers the service plug from above inside the exterior cover.