Electric work machine

Abstract

To easily grasp the remaining capacity of a battery unit by a worker when charging the battery unit.SOLUTION: An electric work machine includes an electric motor, a battery unit that supplies power to the electric motor, a work device that is driven using the driving force of the electric motor, and a charging port to which a cable that charges the battery unit is connected. A display device that displays the remaining capacity of the battery unit is provided near the charging port.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an electric working machine such as a backhoe. [Background technology]

[0002] The electric work machine disclosed in Patent Document 1 includes an electric motor, a battery unit that supplies power to the electric motor, a work device that is driven using the driving force of the electric motor, a charging port to which a cable that charges the battery unit is connected, and an alarm device that notifies the worker riding the electric work machine of the remaining capacity of the battery unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-80703 Summary of the Invention [Problem to be solved by the invention]

[0004] In the electric working machine of Patent Document 1, a display device such as a monitor that displays an image is exemplified as the notification device. Here, in the electric work machine of Patent Document 1, when connecting a cable to the charging port to charge the battery unit to the desired capacity, the worker needs to get on the electric work machine and check the display device to confirm whether the battery unit has been charged to that capacity.

[0005] The present invention has been made to solve the problems of the conventional technology, and aims to provide a rotating work machine that allows the operator to easily grasp the remaining capacity of the battery unit when charging the battery unit. [Means for solving the problem]

[0006] The electric work machine includes an electric motor and a battery unit that supplies power to the electric motor. a battery unit having a plurality of batteries; a working device driven by the driving force of the electric motor; a charging port to which a cable for charging the battery unit is connected; and a driver's seat in which a driver sits. a control device that defines a rechargeable battery that receives power from the cable and stores the power from among the plurality of batteries; and a charging port in the vicinity of the driver's seat. Each of is provided with a display device that displays the remaining capacity of the battery unit, The display device provided near the charging port has an operating tool that accepts selection of an arbitrary battery from among the plurality of batteries in response to operation by an operator, and has a single capacity display unit that indicates the remaining capacity of the charging battery, and the control device defines the arbitrary battery selected by the operating tool as the charging battery, displays the remaining capacity of the defined charging battery on the capacity display unit, and separately displays the remaining capacities of the batteries on the display device provided near the charging port in response to operation of the operating tool. . [Effects of the Invention]

[0007] According to the above-described electric operating machine, when charging the battery unit, the operator can easily grasp the remaining capacity of the battery unit. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic side view showing an electric operating machine according to a first embodiment. [Figure 2] 1 is a schematic plan view showing an electric operating machine according to a first embodiment. [Figure 3] 1 is a schematic rear view showing an electric operating machine according to a first embodiment. [Figure 4] FIG. 2 is a right rear perspective view showing the swivel base in the first embodiment. [Figure 5] FIG. 1 is a diagram illustrating a system of an electric operating machine according to a first embodiment. [Figure 6] FIG. 2 is a rear view showing the hood and the periphery of the charging port in the first embodiment. [Figure 7] FIG. 4 is a left rear perspective view illustrating opening and closing of the cover member in the first embodiment. [Figure 8] FIG. 2 is a rear view showing the charging port and the display device in the first embodiment. [Figure 9] FIG. 1 is a diagram illustrating an example of a display device according to a first embodiment. [Figure 10] 3 is a diagram illustrating a definition of a rechargeable battery and a flow of charging the rechargeable battery in the first embodiment. FIG. [Figure 11]FIG. 10 is a diagram illustrating a display device according to a second embodiment. [Figure 12] 10 is a diagram showing a definition of a rechargeable battery and a series of display switching steps of a capacity display unit in the second embodiment. FIG. [Figure 13] FIG. 10 is a diagram illustrating a display device according to a third embodiment. [Figure 14] 10 is a diagram showing a definition of a rechargeable battery and a series of display switching steps of a capacity display unit in the third embodiment. FIG. [Figure 15] FIG. 10 is a diagram showing a charging port and a display device in a fourth embodiment. [Figure 16] 13 is a diagram showing a definition of a rechargeable battery and a series of steps for switching lamp display in the fourth embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [First embodiment] FIG. 1 is a schematic side view showing an electric working machine 1 in a first embodiment. FIG. 2 is a schematic plan view showing the electric working machine 1 in the first embodiment. FIG. 3 is a schematic rear view showing the electric working machine 1 in the first embodiment. First, the overall configuration of the electric working machine 1 will be described. The electric working machine 1 is a swivel working machine such as a backhoe that is driven by electricity and, as shown in FIG. 1, is equipped with a swivel base (machine body) 2, a lower traveling body 10, and a working device 20. A driver's seat 8 in which a driver sits is provided on the swivel base 2, and the periphery of the driver's seat 8 is covered by a protection mechanism 85.

[0010] In the following explanation, the direction toward which the driver seated in the driver's seat 8 of the electric work machine 1 faces (the direction of arrow A1 in Figures 1, 2, etc.) is referred to as the forward direction, and the opposite direction (the direction of arrow A2 in Figures 1, 2, etc.) is referred to as the rearward direction. The left side of the driver (the front side of Figure 1, the direction of arrow B1 in Figures 2 and 3, etc.) is referred to as the left side, and the right side of the driver (the back side of Figure 1, the direction of arrow B2 in Figures 2 and 3, etc.) is referred to as the right side. The horizontal direction that is perpendicular to the front-to-rear direction is referred to as the width direction (see Figures 2 and 3), and the direction from the center of the swivel base 2 in the width direction toward the right or left side is referred to as the outward width direction.

[0011] As shown in FIGS. 1 and 3, the swivel base 2 is rotatable about a rotation axis (vertical axis) X extending in the vertical direction. Specifically, the swivel base 2 is supported on the undercarriage 10 via a rotation bearing 3 so as to be rotatable about the rotation axis X (rotatable to the left and right). The center of the rotation bearing 3 is the rotation axis X (rotation center), and a rotation motor (not shown) is attached to the swivel base 2. This rotation motor is a hydraulic device M driven by hydraulic oil discharged from a hydraulic pump 92, and is a motor that rotates the swivel base 2 about the rotation axis X. The swivel base 2 is provided with an exterior cover (cover) 80, brackets, stays, etc. The exterior cover 80 forms a space (rear room) R at the rear of the swivel base 2 in which equipment, tanks, other parts, etc. are arranged. The brackets, stays, etc. are members for attaching the above-mentioned parts, etc.

[0012] 1 and 3, the lower traveling body 10 has a traveling frame 11 and a traveling mechanism 12. The traveling frame (track frame) 11 is a structure to which the traveling mechanism 12 is attached and which supports the swivel base 2 on its upper portion. The traveling mechanism 12 is, for example, a crawler type. The traveling mechanism 12 has an idler 13, drive wheels 14, a plurality of rollers 15, an endless crawler belt 16, and hydraulic equipment M (travel motors ML, MR) of the traveling system that is driven by hydraulic oil discharged from a hydraulic pump 92. The traveling motors ML, MR are composed of hydraulic motors, and drive the drive wheels 14 to cause the crawler belt 16 to circulate in the circumferential direction. As shown in FIG. 3, a dozer device 18 is attached to the front of the lower traveling body 10 and is driven up and down by the extension and contraction of a dozer cylinder C5 (M), which is a hydraulic cylinder (hydraulic actuator).

[0013] As shown in FIGS. 1 and 2 , the work device 20 is provided on the front side of the swivel base 2. The work device 20 has a boom 21, an arm 22, and a bucket (work implement) 23. The base end of the boom 21 is pivotally attached to a swing bracket 24 so as to be rotatable around a horizontal axis (an axis extending in the width direction), allowing the boom 21 to swing up and down (vertically). The arm 22 is pivotally attached to the tip of the boom 21 so as to be rotatable around the horizontal axis, allowing the arm 22 to swing back and forth or up and down. The bucket 23 is attached to the tip of the arm 22 so as to be capable of scooping and dumping. The electric work machine 1 can be equipped with another work implement (hydraulic attachment) that can be driven by hydraulic oil, instead of or in addition to the bucket 23. Examples of such other work implements include a hydraulic breaker, hydraulic crusher, angle broom, earth auger, pallet fork, sweeper, mower, snow blower, etc.

[0014] As shown in FIG. 1, the electric working machine 1 is provided with hydraulic equipment M of the working system that is operated by hydraulic oil discharged from a hydraulic pump 92, and the working device 20 is operated by the operation of the hydraulic equipment M of the working system. In this embodiment, the hydraulic equipment M includes a swing cylinder C1, a boom cylinder C2, an arm cylinder C3, and a bucket cylinder C4. The swing cylinder C1, the boom cylinder C2, the arm cylinder C3, and the bucket cylinder C4 are configured by hydraulic cylinders (hydraulic actuators). As shown in FIG. 1, the swing bracket 24 is made swingable by extension and retraction of the swing cylinder C1 provided on the right side of the swivel base 2. The boom 21 is made swingable by extension and retraction of the boom cylinder C2. The arm 22 is made swingable by extension and retraction of the arm cylinder C3. The bucket 23 is made capable of scooping and dumping operations by extension and retraction of the bucket cylinder C4.

[0015] Therefore, the hydraulic equipment M provided in the electric working machine 1 is the swing motor, the travel motors ML and MR, the swing cylinder C1, the boom cylinder C2, the arm cylinder C3, the bucket cylinder C4, and the dozer cylinder C5. As shown in Figures 1, 2, and 3, the exterior cover 80 has a hood 81. The hood 81 includes a rear hood 82, a first side hood 83, and a second side hood 84. The rear hood 82 is a cover member that forms the rear of the rear room R, and is attached to a support frame 35 provided in the rear room R. The rear hood 82 is swingably connected to the support frame 35 by a hinge or the like, and can be opened and closed. The first side hood 83 is a cover member that forms the left side of the rear room R. The second side hood 84 is a cover member that forms the right side of the rear room R.

[0016] The swivel base 2 will now be described. Fig. 4 is a right-rear perspective view showing the swivel base 2 in the first embodiment. As shown in Fig. 4, the swivel base 2 has a swivel base plate (base plate) 30, multiple vertical ribs 31 (first vertical rib 31a, second vertical rib 31b, third vertical rib 31c), a support bracket 32, a partition plate 33, horizontal ribs 34, and a support frame 35. The swivel base plate 30 is formed from a thick steel plate or the like, and is arranged so that the plate surface faces up and down. The swivel base plate 30 is supported on the lower running body 10 via a swivel bearing 3 so as to be rotatable about the swivel axis X.

[0017] The first vertical rib 31a, the second vertical rib 31b, and the third vertical rib 31c are members that reinforce the swivel base 30 and are provided extending in the front-to-rear direction of the swivel base 30. The first vertical rib 31a and the second vertical rib 31b are erected on the swivel base 30 and are arranged side by side and spaced apart in the width direction. The first vertical rib 31a is arranged on the left side of the swivel base 30, and the second vertical rib 31b is arranged on the right side of the swivel base 30. The third vertical rib 31c is arranged between the first vertical rib 31a and the second vertical rib 31b, and is provided extending from the rear of the swivel base 30 to the partition plate 33.

[0018] The support bracket 32 is provided in front of the first vertical rib 31a and the second vertical rib 31b. As shown in Fig. 1, the swing bracket 24 is attached to the support bracket 32 so as to be swingable around a vertical axis (an axis extending in the up-down direction). 4, the partition plate 33 is a member that separates the lower front portion of the rear room R. The partition plate 33 has a plate surface facing the front-rear direction and is disposed in the center of the swivel base plate 30 from one side (left side) to the other side (right side) in the width direction.

[0019] The horizontal ribs 34 are members that reinforce the swivel base plate 30, and are arranged from one side (left side) to the other side (right side) in the width direction at the rear end of the swivel base plate 30. The horizontal ribs 34 are erected on the swivel base plate 30, and are connected to the rear ends of the first vertical ribs 31a, the second vertical ribs 31b, and the third vertical ribs 31c. The support frame 35 is erected at the rear of the swivel base 30, further rearward than the partition plate 33. The support frame 35 is disposed in the rear room R, and supports the exterior cover 80 and peripheral components disposed inside the exterior cover 80. The support frame 35 has a plurality of leg members (first leg 35a, second leg 35b, third leg 35c, fourth leg 35d, fifth leg 35e) erected on the swivel base 30, a first rod member 35h, and a second rod member 35i.

[0020] The first leg 35a is erected on the front left side of the rear room R. The lower end of the first leg 35a extends upward from the swivel base plate 30, extends rearward and upward at a midpoint, and bends at the upper end to extend rearward. It's alive. The second leg 35b is erected on the front right side of the rear room R. The second leg 35b is erected on the rear right side of the partition plate 33. The lower end of the second leg 35b extends upward from the partition plate 33, extends rearward and upward at a midpoint, and bends at the upper end to extend rearward.

[0021] The third leg 35c is erected on the rear left side of the rear room R. The lower end of the third leg 35c extends upward from the swivel base plate 30 and reaches the upper end of the first leg 35a. The fourth leg 35d stands upright at the rear of the rear room R. The fourth leg 35d is disposed toward the left of the rear of the rear room R, and is disposed widthwise inward (to the right) of the third leg 35c. The fourth leg 35d stands upright on the left of the horizontal rib 34. The fourth leg 35d has a lower end that extends upward from the horizontal rib 34, a middle portion that extends forward and upward, and an upper end that bends and extends forward.

[0022] The fifth leg 35e is erected at the rear of the rear room R. The fifth leg 35e is disposed to the right of the rear of the rear room R. The fifth leg 35e is erected at the right of the horizontal rib 34. The fifth leg 35e has a lower end that extends upward from the horizontal rib 34, a middle portion that extends forward and upward, and an upper end that bends and extends forward. 4, the upper end of the fourth leg 35d and the upper end of the fifth leg 35e are connected by a connecting plate 35f arranged to extend in the width direction. In addition, a pair of support pillars 35g are provided on the connecting plate 35f and extend forward from the front end of the connecting plate 35f. The pair of support pillars 35g are spaced apart in the width direction and are arranged to correspond to the upper ends of the fourth leg 35d and the fifth leg 35e, respectively.

[0023] The first rod member 35h and the second rod member 35i are arranged with their plate surfaces facing up and down and extending in the width direction. The first rod member 35h is arranged forward of the second rod member 35i. The first rod member 35h and the second rod member 35i are placed on and fixed to the upper ends of the first leg 35a, the second leg 35b, the left support pillar 35g, and the right support pillar 35g. The first rod member 35h supports the rear of the protection mechanism 85. The second rod member 35i supports the exterior cover 80.

[0024] The following describes the equipment mounted in the rear room R. Fig. 5 is a diagram illustrating the system of the electric working machine 1 in the first embodiment. As shown in Figs. 1, 3, and 5, the electric working machine 1 includes a battery unit 90, an electric motor 91, a hydraulic pump 92, electrical components 93, and a charging port 94, and the battery unit 90, the electric motor 91, the hydraulic pump 92, the electrical components 93, and the charging port 94 are provided on the swivel base 2 and housed in the hood 81.

[0025] The battery unit 90 is a structure that can store electricity and output the stored electricity. In this embodiment, the battery unit 90 includes a plurality of batteries 90a. The plurality of batteries 90a are connected in parallel with one another. The plurality of batteries 90a are capable of storing electricity and are, for example, secondary batteries such as lithium-ion batteries or lead-acid batteries. The plurality of batteries 90a each have a plurality of cells that are electrically connected in series and / or parallel.

[0026] The battery unit 90 has two batteries 90a. The number of batteries 90a included in the battery unit 90 may be one or more, and is not limited to two. As shown in FIGS. 2 and 3, the multiple batteries 90a are arranged adjacent to each other in the width direction. In the following description, the battery 90a arranged on one side (left side) in the width direction may be referred to as the first battery 90a1, and the battery 90a on the other side (right side) in the width direction may be referred to as the second battery 90a2.

[0027] The electric motor 91 is a drive source that is driven by the power output by the battery unit 90. The electric motor 91 is a three-phase AC synchronous motor with embedded permanent magnets. The electric motor 91 has a rotatable rotor and a stator that generates a force to rotate the rotor. Note that the electric motor 91 may be another type of synchronous motor, or may be an AC motor or a DC motor.

[0028] The hydraulic pump 92 receives power from the electric motor 91 and operates the hydraulic equipment M. Discharges moving oil. 5, the electrical components 93 are directly or indirectly connected to the battery unit 90 and are devices that transmit power supplied by the battery unit 90 or that operate using the power. The electrical components 93 are, for example, a junction box 93a, an inverter 93b, and a DC / DC converter 93c. The junction box 93a is connected to other devices including the battery unit 90, the inverter 93b, and the charging port 94. Therefore, the junction box 93a transmits power supplied from the battery unit 90 and power supplied from the charging port 94 to the other devices.

[0029] The inverter 93b is provided in a power supply path 100 from the battery unit 90 to the electric motor 91, and adjusts the power output to the electric motor 91. The inverter 93b is a device that drives the electric motor 91. The inverter 93b converts DC power into three-phase AC power and supplies the three-phase AC power to the electric motor 91. The inverter 93b can arbitrarily change the current and voltage of the power supplied to the electric motor 91.

[0030] The DC / DC converter 93c converts the voltage of the input direct current into a different voltage. In this embodiment, the DC / DC converter 93c is a step-down converter that converts the input voltage into a lower voltage. The DC / DC converter 93c is provided in, for example, the electric work machine 1, and supplies power to an on-board battery 107 that supplies power to electronic devices. The charging port 94 is a structure to which a cable for charging the battery unit 90 is connected. The cable is connected to an external power source, and the charging port 94 supplies power from the external power source to the battery unit 90 via the cable. The charging port 94 is a trapezoidal structure that is long in the width direction when viewed from the rear. FIG. 6 is a rear view showing the hood 81 and the periphery of the charging port 94 in the first embodiment. As shown in FIG. 6, the charging port 94 is provided with a socket 95 to which a cable is connected. The socket 95 is provided on one side (left part) of the charging port 94 in the width direction.

[0031] The socket 95 shown in FIG. 6 and other figures is shown with a cap attached, and when connecting a cable, the cap is removed and the cable is connected. Furthermore, the charging port 94 shown in Figure 6 etc. is an example, and the position of the socket 95 may be provided on the other side (right side) of the charging port 94 in the width direction, or may be provided at the bottom of the charging port 94.

[0032] As shown in Fig. 6, charging port 94 is attached to the rear of support frame 35. Charging port 94 is attached to support stay 36, which is attached across the vertical midpoint of fourth leg 35d and the vertical midpoint of fifth leg 35e. Support stay 36 is disposed to extend in the width direction and supports charging port 94 in its widthwise center. Rear hood 82 (hood 81) is provided with window 82a. Window 82a is a through-hole that communicates between the interior (rear room) R of hood 81 and the outside of hood 81, and is formed in a position corresponding to charging port 94. Therefore, charging port 94 is disposed facing window 82a.

[0033] In addition, a lid member (charging lid) 82b is attached to window portion 82a. Window portion 82a can be switched between a closed position 82b1 that covers charging port 94 and an exposed position 82b2 that exposes charging port 94. Specifically, lid member 82b has a shape that corresponds to window portion 82a, and is swingably connected to rear hood 82 and support frame 35 by hinges or the like.

[0034] Figure 7 is a left rear perspective view illustrating the opening and closing of cover member 82b in the first embodiment. As shown in Figure 7, in this embodiment, a hinge connects the upper part of cover member 82b to the upper part of window portion 82a, and cover member 82b swings up and down around the swing axis of the hinge to switch between a closed position 82b1 and an exposed position 82b2. Therefore, when connecting a cable to socket 95, an operator opens cover member 82b to expose it from the rear hood 82.

[0035] It should be noted that the rear hood 82 only needs to be openable at least at the location corresponding to the charging port 94, and the opening and closing method is not limited to the above-described cover member 82b, and may be, for example, a side-opening or sliding opening. It may be possible to open and close it with a door or the like. The power supply path 100 of the electric operating machine 1 will be described below with reference to Figure 5. The power supply path 100 includes a first path 101, a second path 102, a third path 103, a fourth path 104, a fifth path 105, and a sixth path 106. The first path 101 is a path that connects the charging port 94 and the junction box 93a. The first path 101 supplies power received from a cable connected to the charging port 94 (socket 95) to the junction box 93a.

[0036] The second path 102 is a path that connects the junction box 93a and the battery unit 90. The second path 102 is a path that supplies power supplied from the charging port 94 via the first path 101 and the junction box 93a to the battery unit 90, and supplies power from the battery unit 90 to the junction box 93a. The second path 102 branches midway, and each branch is connected to the battery 90a.

[0037] The third path 103 is a path that connects the junction box 93a and the inverter 93b. The third path 103 supplies the power that is supplied from the battery unit 90 via the second path 102 and the junction box 93a to the inverter 93b. The fourth path 104 is a path that connects the inverter 93b and the electric motor 91. The fourth path 104 supplies the electric power that is supplied from the battery unit 90 via the second path 102, the junction box 93a, the third path 103, and the inverter 93b to the electric motor 91.

[0038] The fifth path 105 is a path that connects the junction box 93a and the DC / DC converter 93c. The fifth path 105 supplies the power that is supplied from the battery unit 90 via the second path 102 and the junction box 93a to the DC / DC converter 93c. The sixth path 106 is a path that connects the DC / DC converter 93c and the in-vehicle battery 107. The sixth path 106 supplies the power that is supplied from the battery unit 90 via the second path 102, the junction box 93a, the fifth path 105, and the DC / DC converter 93c to the in-vehicle battery 107.

[0039] The above-described power supply path 100 is merely an example, and the configuration thereof is not limited to the above-described configuration. Next, we will explain the system of the electric work machine 1. As shown in Fig. 5, the electric work machine 1 is equipped with a control device 110, a storage unit 111, a connection switching unit 112, and a capacity detection unit 113. The control device 110 is a device made up of electric and electronic circuits, programs stored in a CPU, etc., and controls the various devices of the electric work machine 1.

[0040] For example, the control device 110 returns from a standby state based on the operation of a starter switch 110a provided around the driver's seat 8, and performs start-up control and stop control of the electric work machine 1. In other words, the starter switch 110a can accept start-up and stop operations of the electric work machine 1. Specifically, when the starter switch 110a is turned ON, the control device 110 returns from a standby state and turns ON a starter relay (not shown) to perform start-up control of the electric work machine 1. Also, when the starter switch 110a is turned OFF, the control device 110 turns OFF the starter relay to perform stop control of the electric work machine 1, and transitions to a standby state. The starter relay is a switch that can be switched ON / OFF. When the starter relay is turned ON, various devices of the electric work machine 1 start up, and when the starter relay is turned OFF, the various devices of the electric work machine 1 stop.

[0041] Furthermore, the control device 110 detects whether the rear hood 82 is open or closed based on a signal input from a sensor provided on the hood 81 (rear hood 82). When the rear hood 82 is open, the control device 110 stops driving at least the radiator fan that cools the radiator and the oil cooler fan that cools the oil cooler. The storage unit 111 is a non-volatile memory or the like, and stores various information related to the control of the control device 110.

[0042] The connection switching unit 112 switches the power supply path 100 for each battery 90a. The unit 112 switches between a connection mode and a cutoff mode for each battery 90a, for example, by opening and closing at least a part of the relays in the power supply path 100. The control of the connection switching unit 112 is performed by the control device 110. The control device 110 defines an arbitrary battery 90a among the plurality of batteries 90a as a battery (output battery) that outputs power from the battery unit 90, and when the battery unit 90 is discharging, switches the output battery to the connection mode and switches the other batteries 90a to the cutoff mode.

[0043] The control device 110 is communicably connected to the connection switching unit 112 via wire or wirelessly, and controls the connection switching unit 112 by transmitting signals. The control device 110 selects an output battery based on, for example, the operation of a switch or the like communicably connected to the control device 110, or the remaining capacity of each of the multiple batteries 90a. The connection switching unit 112 is provided on the second path 102 and switches between connection and disconnection between the battery 90a and the junction box 93a for each battery 90a, and switches the mode of the battery 90a between connection mode and disconnection mode. As a result, when the battery unit 90 outputs power, it is possible for the battery 90a in the connection mode among the multiple batteries 90a to output power, and to stop the output of power from the other batteries 90a in the disconnection mode.

[0044] The capacity detection unit 113 detects the remaining capacity of each battery 90a. The capacity detection unit 113 is connected to the control device 110 via wire or wireless communication so as to be able to communicate with the control device 110, and outputs information relating to the detected remaining capacity of the battery 90a to the control device 110. The capacity detection unit 113 detects the remaining capacity of the battery 90a using the terminal voltage of the cells inside the battery 90a and a voltage measurement method.

[0045] The method for detecting the remaining capacity of the battery 90a is not limited to the voltage measurement method, but may be a coulomb counter method, a battery cell modeling method, an impedance track method, etc. In this embodiment, the function of the capacity detection unit 113 is performed by a BMU (battery management unit) 113 provided in each of the multiple batteries 90a. The BMU 113 acquires the voltage, temperature, current, and terminal voltage of the internal cells of the battery 90a, and calculates the remaining capacity of the battery 90a. The BMU 113 can also control the opening and closing of the relays inside the battery 90a, and can control the start and stop of power supply to the battery 90a and the start and stop of charging the battery 90a.

[0046] The BMU 113 may be built into each battery 90a or may be installed externally to each battery 90a. The remaining capacity of the battery 90a is displayed on a display screen 114 provided around the driver's seat 8. The capacity detection unit 113 may be provided separately from the BMU 113. The display of the remaining capacity of the battery unit 90 and the charging of the battery unit 90 will be described below. As shown in FIGS. 5, 6, and 7, a display device 96 is provided near the charging port 94. The display device 96 is connected to the control device 110 via wired or wireless communication and is controlled by signals input from the control device 110. For example, the control device 110 turns the display of the display device 96 on and off depending on the position of the cover member 82b (closed position 82b1, exposed position 82b2). When the cover member 82b is in the closed position 82b1, the control device 110 turns the display of the display device 96 off. On the other hand, when the cover member 82b is in the exposed position 82b2, the control device 110 turns the display of the display device 96 on.

[0047] The control device 110 detects the position of the cover member 82b based on a signal input from a sensor provided on the cover member 82b. The display device 96 may be controlled by a dedicated display control device or the like separate from the control device 110. FIG. 8 is a rear view showing the charging port 94 and the display device 96 in the first embodiment. As shown in FIG. 8, the display device 96 is provided on the opposite side of the charging port 94 from the socket 95. In this embodiment, the display device 96 is provided on the other side (right side) of the charging port 94 in the width direction. The display device 96 displays the remaining capacity of the battery unit 90. The display device 96 displays the remaining capacity of each battery 90a of the battery unit 90 separately. The display device 96 has multiple capacity display units 97. The capacity display units 97 correspond to the batteries 90a and respectively indicate the remaining capacity of the batteries 90a. Specifically, the control device 110 acquires the remaining capacity of each battery 90a calculated by the BMU 113 and outputs display information based on the remaining capacity to the display device 96. The display device 96 changes the display mode of the capacity display unit 97 based on the display information input from the control device 110. As a result, the capacity display units 97 can respectively indicate the remaining capacity of each battery 90a.

[0048] The capacity display unit 97 is composed of a device that can change the display format to indicate the remaining capacity of the battery 90a, such as an indicator including a plurality of light sources (such as LED light sources) 97a to 97f, a meter with a pointer, and a monitor that displays an image. Fig. 9 is a diagram showing an example of the display device 96 in the first embodiment. As shown in Fig. 9, the capacity display unit 97 has an indicator including a plurality of light sources 97a to 97f.

[0049] 9, the capacity display unit 97 is a bar-shaped indicator (level gauge) extending in a predetermined direction, and is capable of displaying the remaining capacity of the battery 90a in stages. The capacity display unit 97 includes a plurality of light source units 97a to 97f arranged in a row in a predetermined direction. Specifically, the capacity display unit 97 extends in the vertical direction, and the plurality of light source units 97a to 97f are arranged in a vertical row. The capacity display units 97 are also arranged spaced apart from one another in the width direction. In this embodiment, the battery unit 90 has two batteries 90a, and therefore there are two capacity display units 97.

[0050] The number of capacity display units 97 corresponds to the number of batteries 90a that the battery unit 90 has, so that if the battery unit 90 has three batteries 90a, the display device 96 has three capacity display units 97, and if the battery unit 90 has four batteries 90a, the display device 96 has four capacity display units 97. The capacity display units 97 correspond to the arrangement of the batteries 90a, and the capacity display unit 97 (first capacity display unit 97A) on one side (left side) of the width shown in Figure 9 indicates the remaining capacity of the left-side battery 90a (first battery 90a1), and the capacity display unit 97 (second capacity display unit 97B) on the other side (right side) of the width indicates the remaining capacity of the right-side battery 90a (second battery 90a2).

[0051] The light source units 97a to 97f can be lit in, for example, green, yellow, or red, and the capacity display unit 97 changes the display mode by turning on or off the light source units 97a to 97f based on a signal output from the control device 110. As shown in Fig. 9, the light source units 97a to 97f include, for example, a total of six light sources, namely, a first light source 97a, a second light source 97b, a third light source 97c, a fourth light source 97d, a fifth light source 97e, and a sixth light source 97f, in that order from the bottom. The number of light source units is not limited to six and can be changed as appropriate.

[0052] The first light source 97a to the sixth light source 97f are light sources that respectively indicate a level between the lowest remaining capacity of the battery 90a (less than 10%: level 0) and the highest remaining capacity (85% or more: level 6). The control device 110 turns off each of the first light source 97a to the sixth light source 97f when the remaining capacity of the battery 90a is less than a predetermined level. The control device 110 also turns on each of the first light source 97a to the sixth light source 97f when the remaining capacity of the battery 90a is equal to or greater than a predetermined level.

[0053] The thresholds of the remaining capacity of the battery 90a at which the control device 110 turns on or off the first to sixth light sources 97a to 97f are defined in advance for each of the first to sixth light sources 97a to 97f and stored in the storage unit 111. The thresholds may be defined to be equally spaced, or the interval between thresholds for a level with a low remaining capacity may be defined to be smaller or larger than the interval between thresholds for a level with a high remaining capacity.

[0054] The first light source 97a indicates that the remaining capacity of the battery 90a is at the lowest level (level 0) and that the remaining capacity of the battery 90a is at level 1. The control device 110 blinks the first light source 97a when the remaining capacity of the battery 90a is less than a first threshold (e.g., 10%). The control device 110 also lights up the first light source 97a when the remaining capacity of the battery 90a is 10% or more. The first light source 97a lights up in red.

[0055] The second light source 97b indicates that the remaining capacity of the battery 90a is level 2, and the control device The control device 110 turns off the second light source 97b if the remaining capacity of the battery 90a is less than a second threshold (for example, 25%). Also, the control device 110 turns on the second light source 97b if the remaining capacity of the battery 90a is 25% or more. The second light source 97b lights up in yellow. The third light source 97c indicates that the remaining capacity of the battery 90a is Level 3, and the control device 110 turns off the third light source 97c if the remaining capacity of the battery 90a is less than a third threshold (e.g., 40%). The control device 110 also turns on the third light source 97c if the remaining capacity of the battery 90a is 40% or more. The third light source 97c lights up in yellow.

[0056] The fourth light source 97d indicates that the remaining capacity of the battery 90a is Level 4, and the control device 110 turns off the fourth light source 97d if the remaining capacity of the battery 90a is less than a fourth threshold (e.g., 55%). The control device 110 also turns on the fourth light source 97d if the remaining capacity of the battery 90a is 55% or more. The fourth light source 97d lights up in green. The fifth light source 97e indicates that the remaining capacity of the battery 90a is Level 5, and the control device 110 turns off the fifth light source 97e if the remaining capacity of the battery 90a is less than a fifth threshold (e.g., 70%). The control device 110 also turns on the fifth light source 97e if the remaining capacity of the battery 90a is 70% or more. The fifth light source 97e lights up in green.

[0057] The sixth light source 97f indicates that the remaining capacity of the battery 90a is at the highest level (Level 6), and the control device 110 turns off the sixth light source 97f if the remaining capacity of the battery 90a is less than a sixth threshold (e.g., 85%). The control device 110 also turns on the sixth light source 97f if the remaining capacity of the battery 90a is 85% or more. The sixth light source 97f lights up in green. This allows the worker to know whether the remaining capacity of the battery 90a is 85% or not, and by keeping the remaining capacity at 85% when charging the battery 90a, the worker can prevent the battery 90a from being overcharged and extend the service life of the battery 90a itself.

[0058] That is, if the remaining capacity of the battery 90a detected by the BMU 113 is less than 10%, the control device 110 blinks the first light source 97a and turns off the second light source 97b to the sixth light source 97f. If the remaining capacity of the battery 90a detected by the BMU 113 is half (the remaining capacity is 50%), the control device 110 turns on the first light source 97a to the third light source 97c of the multiple light source units 97a to 97f and turns off the fourth light source 97d to the sixth light source 97f. If the remaining capacity of the battery 90a detected by the BMU 113 is sufficient (the remaining capacity is 85% or more), the control device 110 turns on all of the multiple light source units 97a to 97f.

[0059] Furthermore, when the battery 90a is being charged, the control device 110 causes the light source units 97a to 97f, which are turned on based on the remaining capacity of the battery 90a, to be repeatedly turned on and off (blinked) at predetermined time intervals, unlike when the battery 90a is being discharged. Specifically, the control device 110 gradually switches the light source units 97a to 97f on and off. In the above-described embodiment, an example was given in which the color that each of the first light source 97a to the sixth light source 97f lights up is determined, but if the first light source 97a to the sixth light source 97f can light up in multiple colors, the control device 110 may change the color that the first light source 97a to the sixth light source 97f lights up in depending on the remaining capacity of the battery 90a.

[0060] In the above-described embodiment, the capacity display unit 97 has an indicator including a plurality of light sources 97a-97f, but the indicator may be displayed on a monitor instead of the plurality of light sources 97a-97f, and the display format is not limited to the above-described embodiment. Even if the capacity display unit 97 has a meter or the like instead of an indicator, the capacity display unit 97 may be arranged to correspond to the arrangement of the batteries 90a.

[0061] As shown in FIGS. 5, 8, and 9, the display device 96 also has an operating tool 98. The operating tool 98 accepts the selection of an arbitrary battery 90a from among the plurality of batteries 90a in response to an operator's operation. The operating tool 98 is communicably connected to the control device 110 by wire or wirelessly, and when the operating tool 98 accepts the selection of an arbitrary battery 90a, the control device 110 defines the arbitrary battery 90a selected by the operating tool 98 as a charging battery from among the plurality of batteries 90a. When the control device 110 defines the charging battery, The definition of the rechargeable battery is stored in the storage unit 111. The rechargeable battery is the battery 90a that receives power from a cable and stores it, and in this embodiment, it is one battery 90a among the plurality of batteries 90a.

[0062] The memory unit 111 may store a predetermined battery 90a or the last battery charged as a charging battery in advance, and the control device 110 can define the predetermined battery 90a as a charging battery in advance even if the operating tool 98 is not operated. In addition, if the charging port 94 is capable of charging multiple batteries 90a simultaneously and the operating tool 98 accepts the selection of multiple batteries 90a, the control device 110 may define any of the multiple batteries 90a selected by the operating tool 98 as the charging battery.

[0063] The operating device 98 is a push switch that can be pressed. When the operating device 98 is pressed, it outputs a signal (operation signal) indicating that the operating device 98 has been pressed to the control device 110. The control device 110 receives the operation signal from the operating device 98, and defines a battery to be charged from the plurality of batteries 90a in a predetermined order each time the operating device 98 is pressed. That is, in this embodiment, since the battery unit 90 has two batteries 90a, the control device 110 switches and defines the battery to be charged each time the operating tool 98 is pressed. This allows the operating tool 98 to accept the selection of any battery 90a from among the multiple batteries 90a.

[0064] The configuration of the operating device 98 is not particularly limited as long as it can select and operate any one of the multiple batteries 90a. For example, instead of a push switch, the operating device 98 may be a slide switch that can be slid from one direction to another, a toggle switch or a dial with multiple switching positions, etc. Furthermore, if the display device 96 is a touch panel, the operating device 98 may be a display image that allows a user to operate a key button or a jog dial to select one of the icons of the multiple batteries 90a displayed on the display device 96.

[0065] As shown in Fig. 5, a connection detection device 94a is provided in the charging port 94. The connection detection device 94a is composed of a sensor and the like that detects that a cable is connected to the socket 95 and an external power source is connected. The connection detection device 94a is connected to the control device 110 so that they can communicate with each other via wire or wirelessly. When the connection detection device 94a detects that the charging port 94 is connected to the external power source, the control device 110 switches the charging battery to a connection mode and the other battery 90a to a cutoff mode.

[0066] Furthermore, when the connection detection device 94a detects the connection between the charging port 94 and the external power supply, the control device 110 instructs the BMU 113 of the charging battery to start charging. Upon receiving the instruction to start charging from the control device 110, the BMU 113 controls the opening and closing of a relay inside the battery 90a, and starts charging the battery 90a. As a result, when storing power, the battery unit 90 allows the battery (rechargeable battery) 90a in the connected mode among the plurality of batteries 90a to store power, and can stop the other batteries 90a in the disconnected mode from storing power.

[0067] 8 and 9, the display device 96 has a selection display unit 99. The selection display unit 99 shows the battery 90a that the control device 110 has defined as a rechargeable battery. The selection display unit 99 shows the battery 90a that has been defined as a rechargeable battery by changing the display format, and in this embodiment, includes a plurality of light source units (such as LED light sources) 99a, 99b that correspond to the battery 90a.

[0068] The light source units 99a, 99b can be lit in green, blue, etc., and the selective display unit 99 changes the display mode by turning on or off the light source units 99a, 99b based on a signal output from the control device 110. As shown in Fig. 9, the light source units 99a, 99b correspond to the capacity display units 97, respectively, and include a seventh light source 99a corresponding to the first capacity display unit 97A and an eighth light source 99b corresponding to the second capacity display unit 97B.

[0069] When the first battery 90a1 is defined as a rechargeable battery, the display device 96 turns on the seventh light source 99a and turns off the eighth light source 99b. On the other hand, when the second battery 90a2 is defined as a rechargeable battery, the display device 96 turns off the seventh light source 99a and turns on the eighth light source 99b. Light up b. The light sources 99a, 99b are arranged near the capacity display 97 that indicates the remaining capacity of the corresponding battery 90a. In the example shown in Fig. 9, the seventh light source 99a is arranged below the first capacity display 97A, and the eighth light source 99b is arranged below the second capacity display 97B.

[0070] In the above-described embodiment, the selection display unit 99 includes a plurality of light source units 99a, 99b. However, the selection display unit 99 may also display a message such as "Charging the first battery 90a1" to indicate the battery 90a defined as a charging battery, and the display format is not limited to the above-described embodiment. The definition of a rechargeable battery and the flow of charging the rechargeable battery will be explained below. Fig. 10 is a diagram showing the definition of a rechargeable battery and the flow of charging the rechargeable battery in the first embodiment. First, the control device 110 determines whether the starter switch 110a has been turned ON based on an operation signal input from the starter switch 110a (S1). If the starter switch 110a has not been turned ON (S1, No), the control device 110 continues the processing of S1 and monitors whether the starter switch 110a has been turned ON.

[0071] When the control device 110 determines that the starter switch 110a has been turned ON (S1, Yes), it returns from the standby state, acquires the remaining capacity of the battery 90a calculated by each BMU 113 (S2), and causes the capacity display unit 97 to display the remaining capacity of the battery 90a (S3). Specifically, the control device 110 outputs display information based on the remaining capacity of the battery 90a to the display device 96, and the capacity display unit 97 displays the remaining capacity of the battery 90a.

[0072] The control device 110 outputs a signal to the selection display unit 99 to display the battery 90a defined as a rechargeable battery based on the definition of the rechargeable battery stored in the storage unit 111 (S4). Next, the control device 110 determines whether the operating tool 98 has been operated (S5). The control device 110 determines whether the operating tool 98 has been operated based on whether an operation signal is output from the operating tool 98.

[0073] When the control device 110 determines that the operating tool 98 has been operated (S5, Yes), it defines a battery 90a different from the rechargeable battery as a rechargeable battery in response to the operation of the operating tool 98 (S6). The control device 110 stores the definition of the rechargeable battery in the memory unit 111, and outputs a signal to the selection display unit 99, causing the selection display unit 99 to display the battery 90a defined as a rechargeable battery (S7). As a result, the selection display unit 99 changes its display to the rechargeable battery newly defined by the control device 110.

[0074] Then, control device 110 determines whether charging port 94 is connected to an external power source (S8). Specifically, control device 110 determines whether a cable is connected to socket 95 and charging port 94 is connected to an external power source, based on a signal input from connection detection device 94a. When the control device 110 determines that the charging port 94 is connected to an external power source (S8, Yes), it switches the charging battery to connection mode and the other battery 90a to disconnection mode (S9). The control device 110 also instructs the BMU 113 of the charging battery to start charging, and the BMU 113 controls the opening and closing of the relay inside the battery 90a to start charging the battery 90a (S10).

[0075] The control device 110 determines whether the starter switch 110a has been turned OFF based on an operation signal input from the starter switch 110a (S11). If the starter switch 110a has not been turned OFF (S11, No), the control device 110 returns to S2 and continues the process. If the starter switch 110a has been turned OFF (S11, Yes), the control device 110 transitions to a standby state and ends the series of processes.

[0076] The above-mentioned electric working machine 1 comprises an electric motor 91, a battery unit 90 that supplies power to the electric motor 91, a working device 20 that is driven using the driving force of the electric motor 91, and a charging port 94 to which a cable for charging the battery unit 90 is connected, and a display device 96 that displays the remaining capacity of the battery unit 90 is provided near the charging port 94. With the above configuration, after connecting a cable to the charging port 94, the worker can easily check the remaining capacity of the battery unit 90 without moving from the charging port 94. Furthermore, even if a worker other than the worker riding on the electric working machine 1 connects a cable to the charging port 94, the other worker can easily check the remaining capacity of the battery unit 90 simply by checking the display device 96 of the charging port 94. Therefore, the worker can arbitrarily stop charging the battery unit 90 and return to work depending on the workload of the work performed with the electric working machine 1 and the remaining capacity of the battery unit 90.

[0077] The battery unit 90 has a plurality of batteries 90a, and the display device 96 displays the remaining capacity of each battery 90a separately. According to the above configuration, after connecting a cable to the charging port 94, the worker can grasp the remaining capacity of each battery 90a without moving from the charging port 94. The electric work machine 1 also includes a control device 110 that defines a rechargeable battery from among the plurality of batteries 90a that receives power from a cable and stores it. The display device 96 has an operating device 98 that accepts the selection of any of the plurality of batteries 90a in response to operation by the worker, and the control device 110 defines any of the batteries 90a selected by the operating device 98 as a rechargeable battery.

[0078] According to the above configuration, the worker can select the battery 90a to charge depending on the load of the work to be performed by the electric work machine 1 and the remaining capacity of the battery unit 90. Therefore, by preventing each battery 90a from being overcharged in relation to the load of the work, work efficiency can be improved. The display device 96 also has a selection display section 99 that indicates the battery 90a that the control device 110 has defined as a rechargeable battery.

[0079] According to the above configuration, the worker can easily know which battery 90a is being charged. The display device 96 also has a plurality of capacity display sections 97, each corresponding to a battery 90a and indicating the remaining capacity of the battery 90a. According to the above configuration, the worker can compare and grasp the remaining capacities of the batteries 90a of the battery units 90. This improves the recognizability of the remaining capacities of the batteries 90a.

[0080] The vehicle also includes a hood 81 that houses the battery unit 90, and the charging port 94 is disposed facing a window 82a formed in the hood 81. According to the above configuration, the worker can easily connect the cable to the charging port 94 and can check the remaining capacity of the battery 90a without moving. The electric operating machine 1 also includes a cover member 82b that is attached to the window portion 82a so as to be able to open and close, and that can be switched between a closed position 82b1 that covers the charging port 94 and an exposed position 82b2 that exposes the charging port 94.

[0081] According to the above configuration, the display device 96 can be prevented from coming into contact with the outside and can be protected from rainwater, dirt, and the like. The electric working machine 1 also includes a hydraulic pump 92 driven by the electric motor 91 to discharge hydraulic oil, a hydraulic device M driven by the hydraulic oil, and a working device 20 operated by the hydraulic device M.

[0082] According to the above configuration, the above-mentioned unique effects can be achieved even in an electric working machine 1 having a working device 20 driven by hydraulic oil. [Second embodiment] In the first embodiment, an example was described in which the display device 96 has multiple capacity display units 97, and each capacity display unit 97 indicates the remaining capacity of each battery 90a, but the display device 96 may have a single capacity display unit 97, and be able to separately display the remaining capacity of each battery 90a of the battery unit 90. Below, the electric operating machine 1 of the second embodiment will be described, focusing on configurations that differ from the above-mentioned embodiment (first embodiment), and configurations that are common to the first embodiment will be assigned the same reference numerals and detailed description will be omitted.

[0083] Fig. 11 is a diagram showing a display device 96 in the second embodiment. As shown in Fig. 11, the display device 96 has a capacity display unit 97 that indicates the remaining capacity of the rechargeable battery, and the display device 96 displays the remaining capacity of a battery 90a, which is different from the rechargeable battery, on the capacity display unit 97 in response to the operation of an operating device 98. Specifically, the operating device 98 accepts a first operation and a second operation. Note that the second embodiment will also be described taking as an example a case where the operating device 98 is a push switch.

[0084] The first operation is an operation for accepting the selection of an arbitrary battery 90a from among the plurality of batteries 90a. The first operation is an operation for continuously pressing the operating implement 98 for a predetermined period of time or longer. The second operation is different from the first operation and is an operation for displaying the remaining capacity of a battery 90a other than the rechargeable battery among the multiple batteries 90a on the capacity display unit 97. The second operation is an operation for continuously pressing the operating tool 98 for less than a predetermined time.

[0085] That is, the first operation is a so-called long press operation, and the second operation is a short press operation that is shorter than the first operation. The determination of whether the operating tool 98 has been the first operation or the second operation is made by the control device 110. The control device 110 acquires an operation signal from the operating tool 98, and if the operation signal has been continuously input for a predetermined time or more, determines that it is the first operation. On the other hand, the control device 110 acquires an operation signal from the operating tool 98, and if the operation signal has been continuously input for less than the predetermined time, determines that it is the second operation.

[0086] The control device 110 defines a battery to be charged from the plurality of batteries 90a in a predetermined order for each first operation of the operating tool 98. That is, in this embodiment, since the battery unit 90 has two batteries 90a, the control device 110 switches and defines the battery to be charged for each first operation of the operating tool 98. This allows the operating tool 98 to accept the selection of any battery 90a from the plurality of batteries 90a.

[0087] Note that the operating device 98 may be any device that can accept the first operation and the second operation, and may have, for example, a first push switch that accepts the first operation and a second push switch that accepts the second operation. Also, instead of a push switch, the operating device 98 may be a slide switch that accepts the first operation, a second push switch that accepts the second operation, and a dial with multiple switching positions, and the configuration is not limited to the configuration described above.

[0088] In addition, in the second embodiment, a notation 99a1 is provided near the seventh light source 99a to clearly indicate its correspondence with the first battery 90a1, and a notation 99b1 is provided near the eighth light source 99b to clearly indicate its correspondence with the second battery 90a2. The display of the capacity display unit 97 in the second embodiment will be described below. In the second embodiment, the capacity display unit 97 indicates the remaining capacity of the rechargeable battery, and indicates the remaining capacity of a battery 90a other than the rechargeable battery among the multiple batteries 90a in response to a second operation. Specifically, the control device 110 defines a battery 90a (display battery) whose remaining capacity is to be displayed on the capacity display unit 97 in a predetermined order from the multiple batteries 90a, with each second operation of the operating implement 98. That is, in this embodiment, since the battery unit 90 has two batteries 90a, the control device 110 switches and defines the display battery with each second operation of the operating implement 98. In the second embodiment, if the operating implement 98 is operated a second time within a predetermined acceptance time (e.g., several seconds) after defining the display battery, the control device 110 further switches and defines the display battery. This allows the operating implement 98 to accept selection of the display battery from among the multiple batteries 90a.

[0089] The control device 110 outputs display information based on the remaining capacity of the displayed battery to the display device 96, and the capacity display unit 97 shows the remaining capacity of the displayed battery. Furthermore, when the operating device 98 is operated in a second manner, the capacity display unit 97 temporarily displays the remaining capacity of the displayed battery from the charging battery, and if the second operation is not performed within the reception time, it displays the remaining capacity of the charging battery after the reception time has elapsed. In other words, when the control device 110 performs the second operation and outputs display information based on the remaining capacity of the displayed battery to the display device 96, and if the second operation is not performed within the reception time, it outputs display information based on the remaining capacity of the charging battery to the display device 96, and the capacity display unit 97 shows the remaining capacity of the charging battery.

[0090] 12 is a diagram showing the definition of a rechargeable battery in the second embodiment and a series of steps for switching the display of the capacity display unit 97. First, the control device 110 determines whether the starter switch 110a has been turned ON based on an operation signal input from the starter switch 110a (S21). If the starter switch 110a has not been turned ON (S21, No), the control device 110 continues the processing of S21 and monitors whether the starter switch 110a has been turned ON.

[0091] When the control device 110 determines that the starter switch 110a has been turned ON (S21, Yes), it returns from the standby state, acquires the remaining capacity of the battery 90a calculated by each BMU 113 (S22), and causes the capacity display unit 97 to display the remaining capacity of the rechargeable battery (S23). Specifically, the control device 110 outputs display information based on the remaining capacity of the battery 90a defined as a rechargeable battery, based on the definition of the rechargeable battery stored in the memory unit 111 and the remaining capacity of the battery 90a, to the display device 96, and the capacity display unit 97 displays the remaining capacity of the rechargeable battery.

[0092] The control device 110 outputs a signal to the selection display unit 99 to display the battery 90a defined as a rechargeable battery based on the definition of the rechargeable battery stored in the storage unit 111 (S24). Next, the control device 110 determines whether the operating tool 98 has been operated (S25). The control device 110 determines whether the operating tool 98 has been operated based on whether an operation signal is output from the operating tool 98.

[0093] When the control device 110 determines that the operating tool 98 has been operated (S25, Yes), it determines whether the first operation of the operating tool 98 has been performed based on the operation signal (S26). When the control device 110 confirms that the operation signal from the operating tool 98 has been continuously output for a predetermined time or more, it determines that the first operation has been performed (S26, Yes). In response to the first operation, the control device 110 defines a battery 90a different from the currently charged battery as a charged battery (S27). The control device 110 outputs display information based on the remaining capacity of the battery 90a defined as the charged battery to the display device 96, and the capacity display unit 97 displays the remaining capacity of the charged battery (S28). As a result, the capacity display unit 97 changes the display to the remaining capacity of the charged battery newly defined by the control device 110.

[0094] Furthermore, the control device 110 outputs a signal to the selection display unit 99, causing the selection display unit 99 to display the battery 90a defined as the rechargeable battery (S29). As a result, the selection display unit 99 changes the display to the rechargeable battery newly defined by the control device 110. On the other hand, when the control device 110 confirms based on the operation signal that the operating tool 98 has not been operated in the first operation mode, i.e., that the operation signal from the operating tool 98 has been continuously output for less than the predetermined time (S26, No), it determines that the second operation has been performed. The control device 110 maintains the definition of the rechargeable battery stored in the memory unit 111 and defines the display battery in response to the second operation (S30). The control device 110 causes the capacity display unit 97 to display the remaining capacity of the display battery (S31). As a result, the capacity display unit 97 changes the display to the remaining capacity of the rechargeable battery newly defined by the control device 110.

[0095] The control device 110 checks whether the reception time has elapsed (S32). If the reception time has not elapsed (S32, No), the control device 110 checks whether a second operation has been performed (S33). If the control device 110 determines that the second operation has been performed within the reception time (S33, Yes), it defines the display battery according to the second operation (S31). Furthermore, when the reception time has elapsed, i.e., when it is determined that the second operation has not been performed within the reception time (S32, No), the control device 110 outputs display information based on the remaining capacity of the battery 90a defined as a rechargeable battery to the display device 96, and the capacity display unit 97 displays the remaining capacity of the rechargeable battery (S34). As a result, the selection display unit 99 changes the display to the remaining capacity of the rechargeable battery.

[0096] The control device 110 determines whether the starter switch 110a has been turned OFF based on the operation signal input from the starter switch 110a (S35). If the starter switch 110a has not been turned OFF (S35, No), the control device 110 returns to S22 and continues the process. If the starter switch 110a has been turned OFF (S35, Yes), the control device 110 transitions to a standby state and ends the series of processes.

[0097] As mentioned above, the display device 96 has a capacity display section 97 that indicates the remaining capacity of the rechargeable battery. According to the above configuration, the operator can easily grasp the remaining capacity of the battery 90a being charged without moving from the charging port 94. The operating device 98 also accepts a first operation for selecting any battery 90a from among the plurality of batteries 90a, and a second operation which is different from the first operation and causes the capacity display unit 97 to display the remaining capacity of a battery 90a from among the plurality of batteries 90a that is different from the rechargeable battery.

[0098] According to the above configuration, even if the charging port 94 is relatively small and the area for providing the display device 96 is narrow, it is possible to display the remaining capacity of the batteries 90a other than the battery 90a being charged, thereby enabling a compact configuration of the display device 96. Furthermore, the operator can compare and grasp the remaining capacity of each of the batteries 90a in the battery unit 90. The first operation is an operation of continuously pressing down the operating tool 98 for a predetermined time or more, and the second operation is an operation of continuously pressing down the operating tool 98 for a time less than the predetermined time.

[0099] According to the above configuration, the display of the remaining capacity of the battery 90a can be switched by a simple operation of the operating tool 98. Furthermore, since the selection of the battery 90a that displays the remaining capacity can be confirmed in a shorter time than the selection of a rechargeable battery, the operator can operate the operating tool 98 without stress. [Third embodiment] In the second embodiment, the display device 96 has a single capacity display unit 97 and displays the remaining capacity of each battery 90a of the battery unit 90 separately. However, the display device 96 may have a single capacity display unit 97 and display only the remaining capacity of the rechargeable battery. The following description of the electric work machine 1 of the third embodiment will focus on configurations that differ from the above-mentioned embodiments (first and second embodiments), and configurations that are common to the first and second embodiments will be assigned the same reference numerals and will not be described in detail. Figure 13 is a diagram showing the display device 96 in the third embodiment.

[0100] As shown in FIG. 13 , the operating device 98 is a seesaw switch (seesaw-type switch) that can be switched between a first position 98a, a neutral position, and a second position 98b. The first position 98a is the position when the upper part of the operating device 98 is pressed, and the second position 98b is the position when the lower part of the operating device 98 is pressed. The operating device 98 can return to the neutral position even when operated to the first position 98a or the second position 98b. When operated to the first position 98a, the operating device 98 outputs a first signal to the control device 110, and when operated to the second position 98b, it outputs a second signal to the control device 110. The control device 110 switches and defines the rechargeable battery based on the first signal and the second signal input from the operating device 98. Specifically, when the first signal is input from the operating device 98, the control device 110 defines the first battery 90a1 as the rechargeable battery. On the other hand, when the control device 110 receives a second signal from the operating tool 98, it defines the second battery 90a2 as a rechargeable battery.

[0101] 13 , in the third embodiment, the selection display unit 99 is provided on an operating tool 98. The seventh light source 99a is arranged at a location on the operating tool 98 corresponding to the first position 98a, and the eighth light source 99b is arranged at a location on the operating tool 98 corresponding to the second position 98b. The seventh light source 99a is arranged at an upper part of the operating tool 98, and the eighth light source 99b is arranged at a lower part of the operating tool 98.

[0102] Therefore, when the operating implement 98 is operated to the first position 98a and the control device 110 defines the first battery 90a1 as a rechargeable battery, the display device 96 turns on the seventh light source 99a arranged at the first position 98a and turns off the eighth light source 99b arranged at the second position 98b. On the other hand, when the operating implement 98 is operated to the second position 98b and the control device 110 defines the second battery 90a2 as a rechargeable battery, the display device 96 turns off the seventh light source 99a arranged at the first position 98a and turns on the eighth light source 99b arranged at the second position 98b.

[0103] 14 is a diagram showing the definition of a rechargeable battery in the third embodiment and a series of steps for switching the display of the capacity display unit 97. The control device 110 determines whether the starter switch 110a has been turned ON based on an operation signal input from the starter switch 110a (S41). If the starter switch 110a has not been turned ON (No in S41), the control device 110 continues the processing of S41 and monitors whether the starter switch 110a has been turned ON.

[0104] When the control device 110 determines that the starter switch 110a has been turned ON (S41, Yes), it returns from the standby state, acquires the remaining capacity of the battery 90a calculated by each BMU 113 (S42), and causes the capacity display unit 97 to display the remaining capacity of the rechargeable battery (S43). Specifically, the control device 110 outputs display information based on the remaining capacity of the battery 90a defined as a rechargeable battery, based on the definition of the rechargeable battery stored in the memory unit 111 and the remaining capacity of the battery 90a, to the display device 96, and the capacity display unit 97 displays the remaining capacity of the rechargeable battery.

[0105] Next, the control device 110 determines whether the operating device 98 has been operated to the first position 98a (S44). The control device 110 determines whether the operating device 98 has been operated to the first position 98a based on whether a first signal has been output from the operating device 98. When the control device 110 determines that the operating implement 98 has been operated to the first position 98a (S44, Yes), it defines the first battery 90a1 as a charging battery (S45). The control device 110 outputs display information based on the remaining capacity of the first battery 90a1 to the display device 96, and the capacity display unit 97 displays the remaining capacity of the first battery 90a1 (S46). As a result, the selection display unit 99 changes the display to the remaining capacity of the first battery 90a1. The control device 110 outputs a signal to the selection display unit 99, causing the selection display unit 99 to display the first battery 90a1 defined as a charging battery (S47). The display device 96 turns on the seventh light source 99a and turns off the eighth light source 99b. As a result, the selection display unit 99 changes the display to the first battery 90a1.

[0106] If the control device 110 determines that the operating device 98 has not been operated to the first position 98a (S44, No), it determines whether the operating device 98 has been operated to the second position 98b (S48). The control device 110 determines whether the operating device 98 has been operated to the second position 98b based on whether a second signal is being output from the operating device 98. When the control device 110 determines that the operating implement 98 has been operated to the second position 98b (S48, Yes), it defines the second battery 90a2 as a charging battery (S49). The control device 110 outputs display information based on the remaining capacity of the second battery 90a2 to the display device 96, and the capacity display unit 97 displays the remaining capacity of the second battery 90a2 (S50). As a result, the selection display unit 99 changes the display to the remaining capacity of the second battery 90a2. The control device 110 outputs a signal to the selection display unit 99, causing the selection display unit 99 to display the second battery 90a2 defined as a charging battery (S51). The display device 96 turns off the seventh light source 99a and turns on the eighth light source 99b. As a result, the selection display unit 99 changes the display to the second battery 90a2.

[0107] The control device 110 determines whether the starter switch 110a has been turned OFF based on the operation signal input from the starter switch 110a (S52). If the starter switch 110a has not been turned OFF (No in S52), the control device 110 returns to S42 and continues the process. If the starter switch 110a has been turned OFF (Yes in S52), the control device 110 transitions to a standby state and ends the series of processes. [Fourth embodiment] In the third embodiment, the display device 96 has a single capacity display unit 97, and only displays the remaining capacity of the rechargeable battery. However, the display device 96 may also have a lamp 197, which may serve as both the capacity display unit 97 and the selection display unit 99. The following description of the electric operating machine 1 of the fourth embodiment will focus on configurations that differ from the above-described embodiments (first to third embodiments), and configurations that are common to the first to third embodiments will be assigned the same reference numerals and will not be described in detail. 15 is a diagram showing a display device 96 in the fourth embodiment.

[0108] 15, the operating device 98 is a seesaw switch that can be switched between a first position 98a, a neutral position, and a second position 98b, similar to the third embodiment. The first position 98a is the position when the left portion of the operating device 98 is pressed down, and the second position 98b is the position when the right portion of the operating device 98 is pressed down. The operating device 98 can return to the neutral position even when operated to the first position 98a or the second position 98b.

[0109] The operating device 98 in the fourth embodiment accepts a first operation and a second operation. The first operation is an operation of pressing the operating device 98 to the first position 98a or the second position 98b for a predetermined time or longer. The second operation is an operation different from the first operation, in which the operating device 98 is pressed to the first position 98a or the second position 98b for less than the predetermined time. The control device 110 defines the first battery 90a1 as a charging battery when the operating device 98 is first operated to the first position 98a and a first signal indicating that the operating device 98 is being pressed to the first position 98a is continuously input for a predetermined time or longer. On the other hand, the control device 110 defines the second battery 90a2 as a charging battery when the operating device 98 is first operated to the second position 98b and a second signal indicating that the operating device 98 is being pressed to the second position 98b is continuously input for a predetermined time or longer.

[0110] Furthermore, when the operating device 98 is second operated to the first position 98a and the first signal is input for a short period of time that is less than a predetermined time, the control device 110 causes the lamp 197 to display the remaining capacity of the first battery 90a1. On the other hand, when the operating device 98 is second operated to the second position 98b and the second signal is input for a short period of time that is less than the predetermined time or more, the control device 110 causes the lamp 197 to display the remaining capacity of the second battery 90a2.

[0111] The lamp 197 is an LED light source or the like that can be turned on and off. The display device 96 displays the remaining capacity of the battery unit 90 by the light emission cycle, light emission intensity, light emission color of the lamp 197, or a combination of these. In this embodiment, the display device 96 is provided with a plurality of lamps 197, and the plurality of lamps 197 correspond to the plurality of batteries 90a and respectively indicate the remaining capacity of the batteries 90a. The plurality of lamps 197 correspond to the plurality of batteries 90a. Furthermore, the plurality of lamps 197 indicates the rechargeable battery by turning off the lamp 197 corresponding to the battery 90a other than the rechargeable battery.

[0112] In this embodiment, the battery unit 90 has two batteries 90a, and therefore there are two lamps 197. For convenience of explanation, the lamp 197 corresponding to the first battery 90a1 will be referred to as the "first lamp 197a," and the lamp 197 corresponding to the second battery 90a2 will be referred to as the "second lamp 197b." The multiple lamps 197 are incorporated into the operating tool 98. Specifically, the first lamp 197a is arranged in a position on the operating tool 98 corresponding to the first position 98a (left part of the operating tool 98), and the second lamp 197b is arranged in a position on the operating tool 98 corresponding to the second position 98b (right part of the operating tool 98).

[0113] When the control device 110 defines the first battery 90a1 as a rechargeable battery, the display device 96 changes the display mode of the first lamp 197a to display the remaining capacity of the first battery 90a1 and turns off the second lamp 197b located at the second position 98b. On the other hand, when the control device 110 defines the second battery 90a2 as a rechargeable battery, the display device 96 turns off the first lamp 197a and changes the display mode of the second lamp 197b to display the remaining capacity of the second battery 90a2.

[0114] When the operating tool 98 is second operated, the control device 110 changes the display mode of the lamp 197 of the battery 90a corresponding to the second operated position (first position 98a or second position 98b) to display the remaining capacity of the battery 90a. In other words, when the operating tool 98 is second operated to a position corresponding to a battery 90a other than a rechargeable battery, the lamp 197 changes its display mode to display the remaining capacity of the battery 90a for a certain period of time (e.g., several seconds), and then turns off.

[0115] The control device 110 acquires the remaining capacity of the battery 90a calculated by each BMU 113, and outputs display information based on the remaining capacity to the display device 96. The display mode of the lamp 197 is changed based on the display information input from the device 110. In this embodiment, the display device 96 changes the light emission cycle of the lamp 197, i.e., the blinking speed, according to the remaining capacity of the battery 90a. For example, the display device 96 displays a longer light emission cycle of the lamp 197 as the remaining capacity of the battery 90a increases, and a shorter light emission cycle as the remaining capacity of the battery 90a decreases.

[0116] The display device 96 may change the display mode of the lamp 197 based on the display information input from the control device 110, and the display mode is not limited to changing the light emission cycle. For example, the display device 96 may increase the light emission intensity of the lamp 197 as the remaining capacity of the battery 90a increases, and decrease the light emission intensity as the remaining capacity of the battery 90a decreases. The display device 96 may also change the light emission color of the lamp 197 according to the remaining capacity of the battery 90a. In such a case, the display device 96 may change the light emission color of the lamp 197 according to the remaining capacity of the battery 90a. For example, the lamp 197 lights up green when the remaining capacity of the battery 90a is 55% or more, lights up yellow when the remaining capacity of the battery 90a is 25% or more but less than 55%, and lights up red when the remaining capacity of the battery 90a is less than 25%.

[0117] 15, the display device 96 also has a charging switch 198. The charging switch 198 is a push switch that can be pressed. When the charging switch 198 is pressed, it outputs a signal (operation signal) indicating that it has been pressed to the control device 110. When the charging switch 198 is pressed while the connection detection device 94a has detected the connection between the charging port 94 and an external power source, the control device 110 switches the charging battery to connection mode and the other battery 90a to cutoff mode. The control device 110 also instructs the BMU 113 of the charging battery to start charging, and the BMU 113 controls the opening and closing of a relay inside the battery 90a to start charging the battery 90a.

[0118] If the calculated remaining capacity of the charging battery is sufficient (for example, 100%), the BMU 113 controls the opening and closing of the relays inside the charging battery to end charging of the charging battery. The control device 110 receives a signal indicating the end of charging of the charging battery from the BMU 113 and switches all batteries 90a to cutoff mode. The control device 110 checks whether the starter switch 110a has been turned OFF. If the control device 110 confirms that the starter switch 110a has been turned OFF, it turns OFF the starter relay, controls the electric work machine 1 to stop, and transitions to a standby state. If the control device 110 confirms that the starter switch 110a has been turned ON, it keeps the starter relay ON.

[0119] Furthermore, the charging switch 198 may receive a start operation for the electric working machine 1 instead of the starter switch 110a when the starter switch 110a is turned OFF. When the control device 110 returns from a standby state based on the operation of the charging switch 198 and performs start-up control of the electric working machine 1, if charging of the battery 90a does not start even after a certain period of time (for example, several minutes) has elapsed, the control device 110 checks whether the starter switch 110a has been turned OFF. When the control device 110 confirms that the starter switch 110a has been turned OFF, it turns OFF the starter relay, performs stop control of the electric working machine 1, and transitions to a standby state. When the control device 110 confirms that the starter switch 110a has been turned ON, it keeps the starter relay ON. Therefore, the electric work machine 1 can be started by operating the charging switch 198, and when the control device 110 obtains the temperature of the battery 90a from the BMU 113 and controls the radiator fan and oil cooler fan, even if the starter switch 110a is not turned ON, when the temperature of the battery 90a rises, the radiator fan and oil cooler fan can be driven to lower the temperature in the rear room R.

[0120] Instead of or in addition to the charging switch 198, the operating tool 98 may receive a start-up operation for the electric operating machine 1 while the starter switch 110a is turned OFF. The configuration of the charging switch 198 is not particularly limited as long as it can perform at least one operation. The charging switch 198 may be configured in combination with the operating tool 98, and may be configured to accept operation by, for example, pressing the neutral position of the operating tool 98. Furthermore, if the display device 96 is a touch panel, the operation tool 98 may be a display image displayed on the display device 96.

[0121] 16 is a diagram showing the definition of a rechargeable battery and a series of steps for switching the display of the lamp 197 in the fourth embodiment. The control device 110 determines whether the starter switch 110a has been turned ON based on an operation signal input from the starter switch 110a (S61). If the starter switch 110a has not been turned ON (No in S61), the control device 110 continues the processing of S41 and monitors whether the starter switch 110a has been turned ON.

[0122] When the control device 110 determines that the starter switch 110a has been turned ON (S61, Yes), it returns from the standby state and obtains the remaining capacity of the battery 90a calculated by each BMU 113 (S62). The control device 110 then outputs a signal to the lamp 197 to indicate that the battery 90a is defined as a rechargeable battery based on the definition of the rechargeable battery stored in the memory unit 111, and also to display the remaining capacity of the rechargeable battery (S63).

[0123] Next, the control device 110 determines whether the operating tool 98 has been operated to the first position 98a (S64). When the control device 110 determines that the operating tool 98 has been operated to the first position 98a (S64, Yes), it determines whether the operating tool 98 has been operated in the first direction based on the first signal (S65). When the control device 110 determines that the operating tool 98 has been operated in the first direction (S65, Yes), it defines the first battery 90a1 as a charging battery (S66).

[0124] The control device 110 determines whether the starter switch 110a has been turned OFF based on the operation signal input from the starter switch 110a (S67). If the starter switch 110a has not been turned OFF (No in S67), the control device 110 returns to S62. If the starter switch 110a has been turned OFF (Yes in S67), the control device 110 transitions to a standby state and ends the series of processes.

[0125] The control device 110 determines that the second operation has been performed if the operating device 98 has been operated to the first position 98a (S64, Yes) and the operating device 98 has not been operated in the first direction (S65, No). If the control device 110 determines that the second operation has been performed (S65, No), the control device 110 outputs display information based on the remaining capacity of the first battery 90a1 to the display device 96, and the first lamp 197a changes its display mode to display the remaining capacity of the first battery 90a1 (S68). After changing its display mode for a certain period of time (e.g., several seconds), the first lamp 197a returns to the display mode prior to S68, and the process proceeds to S67.

[0126] On the other hand, if the operating tool 98 has not been operated to the first position 98a (S64, No), the control device 110 determines whether the operating tool 98 has been operated to the second position 98b (S69). When the control device 110 determines that the operating device 98 has been operated to the second position 98b (Yes in S69), it determines whether the operating device 98 has been operated in the first direction based on the second signal (S70). When the control device 110 determines that the operating device 98 has been operated in the first direction (Yes in S70), it defines the second battery 90a2 as a charging battery (S70) and proceeds to the processing of S67. When the starter switch 110a has not been operated to the OFF position (No in S67), the control device 110 returns to S62.

[0127] The control device 110 determines that the second operation has been performed if the operating device 98 has been operated to the second position 98b (S69, Yes) and the operating device 98 has not been operated in the first direction (S70, No). If the control device 110 determines that the second operation has been performed (S70, No), it outputs display information based on the remaining capacity of the second battery 90a2 to the display device 96, and the second lamp 197b changes its display mode to display the remaining capacity of the second battery 90a2 (S72). After changing its display mode for a certain period of time, the second lamp 197b returns to the display mode it had before S72, and the process proceeds to S67.

[0128] In the fourth embodiment, the display device 96 has been described as having a plurality of lamps 197. However, instead of the plurality of lamps 197, a single lamp 197 may be provided to display the remaining capacity of the battery unit 90 by a light emission cycle, a light emission intensity, a light emission color, or a combination thereof. In such a case, the lamp 197 may be able to display the remaining capacity of each battery 90a of the battery unit 90 separately by applying the invention of the second embodiment.

[0129] As described above, the display device 96 includes the lamp 197, and displays the remaining capacity of the battery unit 90 by the light emission cycle, light emission intensity, or light emission color of the lamp 197, or a combination thereof. According to the above configuration, after connecting a cable to charging port 94, the worker can easily determine the remaining capacity of battery unit 90 by checking lamp 197 without moving from charging port 94.

[0130] The display device 96 also has a plurality of lamps 197 corresponding to the plurality of batteries 90a, and displays the remaining capacity of the battery 90a corresponding to the lamp 197 by the light emission cycle, light emission intensity, light emission color, or a combination of these. According to the above configuration, after connecting a cable to charging port 94, the worker can easily ascertain the remaining capacity of each battery 90a by checking lamp 197 without moving from charging port 94.

[0131] The operating tool 98 is a seesaw switch, and the plurality of lamps 197 are incorporated into the seesaw switch. According to the above configuration, even if charging port 94 is relatively small and the area in which display device 96 is provided is narrow, multiple lamps 197 can be arranged compactly. Although the present invention has been described above, the embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. For example, in the above embodiment, the present invention is applied to a backhoe, which is a rotating work machine, but the application of the present invention is not limited to this and can be applied to various types of work machines, such as various construction machines, civil engineering machines, and agricultural machines.

[0132] Furthermore, in the above-described embodiment, the travel motors ML, MR, swing motor MT, and each part of the working device 20 are hydraulically driven, i.e., driven by the driving force of the electric motor 91 via hydraulic oil. However, this is not limiting, and some or all of these may be directly driven by the electric motor (electric actuator) 91. [Explanation of symbols]

[0133] 1 Electric work machine (swivel work machine) 20 Work equipment 81 Bonnet 82a Window section 82b Lid member 82b1 Closed position 82b2 Exposure position 90 Battery Unit 90a battery 91 Electric motor 92 Hydraulic pump 94 Charging port 96 Display device 97 Capacity display section 98 Operating tools 99 Selection display section 110 Control device 197 Lamp M Hydraulic Equipment

Claims

1. An electric motor; a battery unit for supplying power to the electric motor, the battery unit including a plurality of batteries; a working device driven by the driving force of the electric motor; a charging port to which a cable for charging the battery unit is connected; A driver's seat where the driver sits; a control device that defines a rechargeable battery that receives power from the cable and stores the power from among the plurality of batteries; Equipped with a display device for displaying a remaining capacity of the battery unit is provided near the driver's seat and near the charging port, The display device provided near the charging port has an operating tool that accepts selection of an arbitrary battery from among the plurality of batteries in response to an operation by an operator, a single capacity display that indicates the remaining capacity of the rechargeable battery; the control device defines the arbitrary battery selected by the operating tool as the rechargeable battery, and causes the capacity display unit to display the remaining capacity of the defined rechargeable battery; An electric working machine that displays the remaining capacity of the battery separately on the capacity display section of the display device provided near the charging port in response to operation of the operating tool.

2. 2. The electric operating machine according to claim 1, wherein the display device provided near the charging port has a selection display section that indicates a battery defined by the control device as the rechargeable battery.

3. The operating tool is a first operation for accepting a selection of the arbitrary battery from among the plurality of batteries; a second operation that is different from the first operation and causes the capacity display unit to display the remaining capacity of a battery other than the rechargeable battery among the plurality of batteries; The electric operating machine according to claim 1, wherein the electric operating machine receives

4. the first operation is an operation of continuously pressing the operating tool for a predetermined time or more, The electric operating machine according to claim 3 , wherein the second operation is an operation of continuously pressing down the operating tool for a period of time shorter than the predetermined period of time.

5. a hood that houses the battery unit; The electric operating machine according to any one of claims 1 to 4, wherein the charging port is disposed facing a window formed in the hood.

6. The electric operating machine according to claim 5, further comprising a cover member that is attached to the window portion so as to be able to open and close, and that switches between a closed position that covers the charging port and an exposed position that exposes the charging port.

7. The electric operating machine according to any one of claims 1 to 6, wherein the display device provided near the charging port has a lamp and displays the remaining capacity of the battery unit by the light emission cycle, light emission intensity, or light emission color of the lamp, or a combination thereof.

8. 2. The electric work machine according to claim 1, wherein the display device provided near the charging port has a plurality of lamps corresponding to the plurality of batteries, and displays the remaining capacity of the battery corresponding to the lamp by the light emission cycle, light emission intensity, light emission color, or a combination of these of the lamp.

9. the operating tool is a seesaw switch, The electric operating machine according to claim 8, wherein the plurality of lamps are incorporated into the seesaw switch.

10. a hydraulic pump driven by the electric motor to discharge hydraulic oil; a hydraulic device driven by the hydraulic oil; The electric working machine according to any one of claims 1 to 9, further comprising: a working device operated by the hydraulic device.

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