Electric working machine

Abstract

Provided is an electric working machine capable of appropriately displaying charging information of a first battery.　An electric working machine (1) comprises: a first battery (41); an electric actuator (40) that is driven by electric power supplied from the first battery (41); a first operation tool (51) that receives a power ON / OFF operation; a display device (53); and a control device (50) that, when an operation for switching from an ON state to an OFF state is input to the first operation tool (51), causes the display device (53) to display a charging screen (G2) including the charging information of the first battery (41).

Description

electric work equipment

[0001] The present invention relates to an electric power tool.

[0002] The work vehicle disclosed in Patent Document 1 includes a drive battery, an electric motor that is driven by power supplied from the drive battery, and a display device.

[0003] International Publication No. 2022 / 270010

[0004] The electric work machine of Patent Document 1 displays a charge mode screen on the display device when set to charge mode. However, with the electric work machine of Patent Document 1, the charge mode screen is not displayed unless a charge operation is performed, so if the worker wants to know the charge information, for example, when work is finished, he or she needs to perform a charge operation.

[0005] The present invention has been made to solve the problems of the prior art, and has an object to provide an electric work machine that can appropriately display battery charge information.

[0006] An electric work machine according to one aspect of the present invention comprises a first battery, an electric actuator driven by power supplied from the first battery, a first operating device that accepts power supply ON / OFF operations, a display device, and a control device that causes the display device to display a charging screen including charging information for the first battery when an operation input is made to the first operating device to switch it from an ON state to an OFF state.

[0007] The control device may cause the charging screen to display the current remaining capacity of the first battery and an estimated charging time required to charge the first battery to a predetermined remaining capacity level.

[0008] The control device may display a plurality of the remaining capacity levels on the charging screen, and may also display the estimated charging time required to charge the first battery to each remaining capacity level.

[0009] The control device may be capable of switching between a plurality of charging modes in which the first battery is charged at different charging speeds, and may cause the charging screen to display the estimated charging time for each of the charging modes.

[0010] The electric working machine may include a capacity detection unit that detects the current remaining capacity of the first battery, and the control device may calculate the expected charging time based on the current remaining capacity of the first battery detected by the capacity detection unit.

[0011] The control device may display on the charging screen the current remaining capacity of the first battery and an expected remaining capacity level of the first battery if the first battery is charged for a predetermined charging time.

[0012] The control device may display a plurality of the predetermined charging times on the charging screen, and may also display the predicted remaining capacity levels when the first battery is charged for each of the predetermined charging times.

[0013] The control device may be capable of switching between a plurality of charging modes in which the first battery is charged at different charging speeds, and may cause the charging screen to display the estimated remaining capacity level for each of the charging modes.

[0014] The electric operating machine may include a capacity detection unit that detects a current remaining capacity of the first battery, and the control device may calculate the predicted remaining capacity level based on the current remaining capacity of the first battery detected by the capacity detection unit.

[0015] When charging of the first battery starts while the charging screen is being displayed on the display device, the control device may display a first image on the charging screen indicating that the first battery is being charged.

[0016] The control device may display a second image on the charging screen for inputting an instruction to transition to a charging setting screen for making settings related to charging of the first battery, and when it receives an instruction input on the second image, it may display the charging setting screen on the display device.

[0017] The control device may stop displaying the charging screen if a predetermined time has elapsed without any other instruction input after an operation input to switch the first operating device from the ON state to the OFF state has been made to cause the display device to start displaying the charging screen.

[0018] The electric work machine may include a second battery that supplies power to the display device, and the control device may continue to supply power from the second battery to the display device until the predetermined time has elapsed after an operational input is made to the first operating tool to switch it from the ON state to the OFF state, and may cut off the supply of power from the second battery to the display device when the predetermined time has elapsed.

[0019] The control device may perform a predetermined shutdown process and cause the display device to display a shutdown screen indicating that the shutdown process is in progress until the shutdown process is completed, if a predetermined time has passed without any other instruction input after an operation input is made to the first operating device to switch from the ON state to the OFF state and the display device has started to display the charging screen.

[0020] The control device may display, on the charging screen, a remaining operable time corresponding to a current remaining capacity of the first battery.

[0021] The electric working machine includes a hydraulic pump that discharges hydraulic oil, a hydraulic actuator that is driven by the hydraulic oil discharged by the hydraulic pump, and a working device that operates by driving the hydraulic actuator, and the electric actuator may be an electric motor that supplies power to the hydraulic pump.

[0022] The control device may switch the power supply to the OFF state by cutting off the power supply from at least the first battery to the electric actuator when an operational input is made to the first operating tool to switch from the ON state to the OFF state.

[0023] According to the above configuration, the charging information of the first battery can be displayed appropriately.

[0024] FIG. 1 is a schematic side view showing the overall configuration of an electric working machine according to the present embodiment; FIG. 2 is a diagram illustrating a hydraulic circuit of an electric working machine according to the present embodiment; FIG. 3 is a block diagram showing an outline of the configuration of an electric working machine; FIG. 4 is a diagram showing an example of a normal screen; FIG. 5 is a diagram showing an example of a charging screen; FIG. 6 is a diagram showing an example of a charging screen in a first modified example; FIG. 7 is a diagram showing an example of a charging screen in a second modified example; FIG. 8 is a diagram showing another example of a charging screen in the second modified example; FIG. 9 is a diagram showing an example of a charge setting screen; FIG. 10 is a diagram showing another example of a charge setting screen; FIG. 11 is a diagram showing an example of a shutdown screen; FIG. 12 is a diagram showing screen transitions of a display device in the present embodiment; FIG. 13 is a diagram showing screen transitions of a display device in another modified example.

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0026] 1 is a schematic side view showing the overall configuration of an electric work machine 1 according to this embodiment. In this embodiment, a backhoe, which is a slewing work machine, is shown as an example of the electric work machine 1. Note that the electric work machine 1 is not limited to a backhoe, and may be other construction machinery such as a compact rack loader or a skid steer loader, or agricultural machinery such as a tractor, a combine harvester, or a rice transplanter.

[0027] As shown in Fig. 1, the electric work machine 1 includes a machine body (swivel) 2, a traveling device 10, and a work device 20. A driver's seat 3 in which an operator sits and a protection mechanism (cabin) 4 that protects the driver's seat 3 from the front, back, left, right, and above are provided on top of the machine body 2. An operating device 5 for operating the electric work machine 1 is provided around the driver's seat 3. The operator can operate the operating device 5 while seated in the driver's seat 3. The protection mechanism 4 is not limited to the cabin shown in Fig. 1 and may be a canopy.

[0028] As shown in Figure 1, the traveling device 10 is a device that supports the machine body 2 so that it can travel. The traveling device 10 has a first traveling device 10L provided on the left side of the machine body 2 and a second traveling device 10R provided on the right side of the machine body 2. The first traveling device 10L and the second traveling device 10R are operated by hydraulic actuators M (for example, traveling motors ML, MR configured by hydraulic motors). The traveling device 10 can be, for example, a crawler type or a wheel type traveling device.

[0029] As shown in Figure 1, the machine body 2 has a swivel base 6 that forms the bottom of the machine body 2. The swivel base 6 is supported on a traveling frame 10A of a traveling device 10 via a swivel bearing 7 so as to be rotatable about a swivel axis X, which is an axis extending in the vertical direction. A swivel motor MT is provided inside the machine body 2. The swivel base 6 operates (swivels) about the swivel axis X by a hydraulic actuator M (for example, a swivel motor MT formed by a hydraulic motor).

[0030] The working device 20 is supported on the front of the machine body 2. The working device 20 is operated by driving a hydraulic actuator M. The hydraulic actuator M that operates the working device 20 is hydraulic cylinders C1 to C4 that are driven (extend and contract) by hydraulic oil. The working device 20 has a boom 21, an arm 22, a bucket 23, and hydraulic cylinders C1 to C4. The base end side of the boom 21 is pivotally mounted to a swing bracket 24 so as to be rotatable around a horizontal axis (an axis extending in the width direction of the machine body 2). This allows the boom 21 to swing up and down (vertically).

[0031] The swing bracket 24 swings left and right by extension and retraction of the hydraulic cylinder C1. The boom 21 swings up and down (front and back) by extension and retraction of the hydraulic cylinder C2. The arm 22 swings up and down (front and back) by extension and retraction of the hydraulic cylinder C3. The bucket 23 performs scooping and dumping operations by extension and retraction of the hydraulic cylinder C4.

[0032] Instead of or in addition to the bucket 23, the work device 20 can be equipped with another work tool (hydraulic attachment) that can be driven by the hydraulic actuator M. Examples of other work tools include a hydraulic breaker, hydraulic crusher, angle broom, earth auger, pallet fork, sweeper, mower, and snow blower. The work device 20 may also include a dozer device 11 provided in front of the traveling device 10. The dozer device 11 swings up and down by extension and contraction of the hydraulic cylinder C5.

[0033] The electric work machine 1 performs work using the traveling device 10 having the above-mentioned traveling motors ML and MR, the working device 20 having the hydraulic cylinders C1 to C5, and the swing motor MT. The traveling device 10 can also be considered to be the working device 20 provided in the electric work machine 1. In the following explanation, the traveling motors ML and MR, the swing motor MT, and the hydraulic cylinders C1 to C5 may be collectively referred to as the hydraulic actuator M.

[0034] Figure 2 is a diagram illustrating a hydraulic circuit K of the electric working machine 1 according to this embodiment. As shown in Figure 2, the hydraulic circuit K includes hydraulic pumps P1 and P2, a hydraulic actuator M, a hydraulic oil tank T, a control valve V, etc. An oil passage 30 connects the hydraulic actuator M, the hydraulic pumps P1 and P2, and the control valve V, respectively, and allows hydraulic oil to flow.

[0035] Of the multiple hydraulic pumps P1, P2 provided, one is an actuation hydraulic pump P1 and the other is a control hydraulic pump P2. The hydraulic pumps P1, P2 discharge hydraulic oil into an oil passage 30. The hydraulic actuator M is driven by the hydraulic oil discharged into the oil passage 30 by the hydraulic pumps P1, P2.

[0036] The actuation hydraulic pump P1 draws in hydraulic oil stored in a hydraulic oil tank T and then discharges the hydraulic oil toward the control valve V. The control hydraulic pump P2 draws in hydraulic oil stored in the hydraulic oil tank T and then discharges the hydraulic oil, thereby outputting hydraulic pressure for signals, control, etc. In the example shown in Figure 2, for convenience, one actuation hydraulic pump P1 and one control hydraulic pump P2 are provided, but any appropriate number of pumps may be provided.

[0037] The control valve V has a plurality of control valves V1 to V8. Each of the control valves V1 to V8 controls (adjusts) the flow rate of hydraulic oil output from the hydraulic pumps P1 and P2 to the hydraulic actuator M, respectively.

[0038] The control valves PV1 to PV6 operate in response to the operation of various control levers provided on the operating device 5. Pilot oil acts on each control valve V1 to V8 in proportion to the operation amount (operation amount) of each control valve PV1 to PV6, thereby moving the spool of each control valve V1 to V8. Then, an amount of hydraulic oil proportional to the amount by which the spool of each control valve V1 to V8 is moved is supplied to the hydraulic actuator M to be controlled. Furthermore, each hydraulic actuator M is driven in accordance with the amount of hydraulic oil supplied from each control valve V1 to V8.

[0039] Fig. 3 is a block diagram showing an outline of the configuration of the electric work machine 1. As shown in Fig. 3, the electric work machine 1 is equipped with a control device 50. The control device 50 is a controller for the electric work machine 1 and performs various controls related to the electric work machine 1. As shown in Fig. 3, the control device 50 has a processor 50a and a storage unit 50b. The processor 50a is, for example, one or more central processing units (CPUs).

[0040] The storage unit 50b is composed of a volatile or non-volatile memory, etc. The storage unit 50b includes, for example, an SSD (Solid State Drive) or an HDD (Hard Disk Drive). The storage unit 50b of the control device 50 stores programs and various data in a readable and writable manner for the control device 50 to control the operation of each part of the electric work machine 1. The processor 50a reads and executes the programs from the storage unit 50b, thereby realizing the functions of the control device 50.

[0041] Note that some or all of the configuration of the control device 50 may be realized by hardware (processing circuitry) such as an LSI (Large Scale Integration), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a GPU (Graphics Processing Unit), or may be realized by cooperation between a program (software) and hardware.

[0042] The control device 50 may also be an electronic control unit (ECU (Electronic Control Unit)) that is made up of multiple CPUs and controls the electrical components mounted on the electric operating machine 1 .

[0043] The control device 50 is communicably connected to a plurality of devices mounted on the electric working machine 1 via an in-vehicle communication network N such as a Controller Area Network (CAN) or FlexRay. For example, the control device 50 controls the operation of each part of the electric working machine 1 as shown in FIGS. 1 to 3.

[0044] As shown in Fig. 3, the electric work machine 1 includes a first battery 41 and an electric actuator 40. The first battery 41 is a rechargeable secondary battery. The first battery 41 is electrically connected to a junction box 44 and supplies power to the electric actuator 40 via the junction box 44 and an inverter 43. The first battery 41 functions as a drive power source (main power source) for the electric work machine 1.

[0045] The first battery 41 is, for example, a lead battery or a lithium-ion battery. The first battery 41 has a plurality of battery modules each including a plurality of battery cells (lithium-ion batteries) electrically connected (in series), and a battery case that houses the plurality of battery modules. In other words, the first battery 41 is a battery pack in which the plurality of battery modules are housed in a battery case, and the plurality of battery modules are electrically connected (in series or parallel, for example).

[0046] A battery management unit (BMU) 41a is provided in the first battery 41. In the example shown in Fig. 3, the BMU 41a is provided inside the first battery 41, but the BMU 41a may be built into the first battery 41 or provided outside the first battery 41. A battery monitoring function may be included in the control device 50.

[0047] The BMU 41a monitors and controls the first battery 41. Specifically, the BMU 41a controls the opening and closing of a relay provided inside the first battery 41 to control the start and stop of power supply from the first battery 41. The BMU 41a also detects the temperature, current, voltage, terminal voltage of the internal battery cells, etc. of the first battery 41.

[0048] The first battery 41 is provided with a capacity detection unit 41b. The capacity detection unit 41b detects (calculates) a current remaining capacity 71 of the first battery 41. The current remaining capacity 71 includes a battery capacity and a remaining battery amount indicating the ratio of the battery capacity to the battery capacity when fully charged. The capacity detection unit 41b detects the battery capacity of the first battery 41 using a voltage measurement method, for example, based on the terminal voltage of the internal cells of the first battery 41 detected by the BMU 41a. Note that the method for detecting the battery capacity of the first battery 41 is not limited to the voltage measurement method, and other methods such as a coulomb counter method, a cell modeling method, or an impedance track method may also be used. The capacity detection unit 41b pre-stores the battery capacity of the first battery 41 when fully charged. The capacity detection unit 41b calculates the remaining battery amount based on the battery capacity of the first battery 41 when fully charged and the detected battery capacity of the first battery 41. Note that the capacity detection unit 41b may be implemented as a function included in the BMU 41a. Furthermore, the battery capacity when fully charged may be changeable as needed.

[0049] As shown in Fig. 3, the electric actuator 40 is driven by power supplied from a first battery 41. As shown in Fig. 2, the electric actuator 40 is an electric motor that supplies power to hydraulic pumps P1, P2. In this embodiment, the electric actuator 40 is an electric motor configured, for example, as a permanent magnet embedded three-phase AC synchronous motor. Note that, although the electric actuator 40 supplies power to the hydraulic pumps P1, P2 in this embodiment, it is sufficient that the electric actuator 40 is driven by power supplied from the first battery 41 and can operate at least each device included in the electric work machine 1.

[0050] As shown in Fig. 3, the electric work machine 1 is equipped with a second battery 42 in addition to the first battery 41. The second battery 42 is a secondary battery that can store electricity and has a lower voltage than the first battery 41. The second battery 42 functions as a power source (accessory power source) that supplies power to electrical components provided in the electric work machine 1. For example, the second battery 42 supplies power to a display device 53, which will be described later. Furthermore, the main ECU of the control device 50, which controls the overall operation of the electric work machine 1, operates by receiving a constant supply of power from the second battery 42.

[0051] The electric work machine 1 includes an inverter 43 , a junction box 44 , a DC / DC converter 45 , a charging port 46 , and a charger 47 .

[0052] The inverter 43 is a motor drive device that supplies power from the first battery 41 to the electric actuator 40 to drive the electric actuator 40. The inverter 43 is electrically connected to the electric actuator 40 and the junction box 44. The inverter 43 converts DC power input from the first battery 41 via the junction box 44 into three-phase AC power and supplies the three-phase AC power to the electric actuator 40. This drives the electric actuator 40. The inverter 43 can also arbitrarily adjust the current and voltage of the power supplied to the electric actuator 40. The control device 50 controls the operation of the inverter 43 to drive or stop the electric actuator 40.

[0053] The junction box 44 is electrically connected to the first battery 41, the DC / DC converter 45, and the charger 47 in addition to the inverter 43. The junction box 44 outputs the power output from the first battery 41 to the inverter 43 and the DC / DC converter 45. The junction box 44 also outputs the power input from the charger 47 to the first battery 41.

[0054] The DC / DC converter 45 is a voltage conversion device that converts the voltage of the direct current input from the first battery 41 via the junction box 44 into a different voltage. In this embodiment, the DC / DC converter 45 is a step-down converter that converts the high voltage of the first battery 41 into a predetermined low voltage that is appropriate for the electrical equipment provided in the electric work machine 1. The DC / DC converter 45 supplies power to the second battery 42 after voltage conversion. The electrical equipment includes, for example, the control device 50, the display device 53, and fan motors for the oil cooler and radiator provided in the electric work machine 1.

[0055] The charging port 46 has a connector into which a charging cable is fitted and a connection detection sensor 46a. The charging port 46 is connected to an external power source (such as a commercial power source or a quick charger) via the charging cable.

[0056] When the connection detection sensor 46a detects that a charging cable is connected to the charging port 46, the control device 50 switches to a charging state in which power is supplied to the first battery 41, and when the connection detection sensor 46a detects that a charging cable is not connected to the charging port 46, the control device 50 switches to a charging stop state in which power is not supplied to the first battery 41.

[0057] Charger 47 is electrically connected to charging port 46 and junction box 44, converts three-phase AC power input from an external power source via the charging cable and charging port 46 into DC power, and supplies the DC power to junction box 44. Charger 47 has a rectifier that converts the three-phase AC power into DC power, and an electronic circuit that adjusts the current and voltage of the DC power supplied to junction box 44.

[0058] The electronic circuit is composed of, for example, switching elements, diodes, resistors, and electrolytic capacitors. In this embodiment, the charger 47 uses the electronic circuit to adjust the current and voltage of the DC power supplied to the junction box 44 and charges the first battery 41 by constant current charging or constant voltage charging. The charger 47 adjusts the current and voltage based on a signal from the control device 50. The control device 50 switches between constant current charging and constant voltage charging depending on the current remaining capacity 71 of the first battery 41. The current and voltage of the DC power when performing constant current charging or constant voltage charging are defined by a predetermined table T1 stored in a memory unit 50b provided in the control device 50.

[0059] The control device 50 can change various settings related to the charging of the first battery 41. For example, the control device 50 can switch between multiple charging modes that charge the first battery 41 at different charging rates. In this embodiment, the control device 50 can switch the charging mode between either a first charging mode or a second charging mode. In the first charging mode, the charging can be completed in a short time by supplying a relatively large amount of power to the first battery 41. In the second charging mode, the charging time is longer than in the first charging mode, but heat generation and deterioration of the first battery 41 during charging can be suppressed by supplying a smaller amount of power to the first battery 41 than in the first charging mode. For example, the control device 50 displays "Normal," which indicates the first charging mode, and "Heat Generation Suppression," which indicates the second charging mode, on the charging setting screen G3 (G3b) of the display device 53 ( FIG. 6B ). When the control device 50 receives an operation on the charge setting screen G3, it changes (switches) the setting of the charge mode.

[0060] The power setting value for each charging mode is defined in advance in a charging mode table T2 stored in the storage unit 50b. When the control device 50 starts charging the first battery 41, it references the charging mode table T2 and acquires the power setting value. The control device 50 transmits an instruction signal including the acquired power setting value to the charger 47, and controls the power supplied to the first battery 41.

[0061] The charging modes switchable by the control device 50 are not limited to the first charging mode and the second charging mode, and the control device 50 may be capable of switching to other modes. Furthermore, the other modes may include modes with different target battery capacities in addition to different charging speeds. For example, in addition to the first charging mode and the second charging mode, or instead of the second charging mode, a third charging mode (fast charging mode) may be provided that supplies more power to the first battery 41 and completes charging in a shorter time than in the first charging mode.

[0062] As shown in Fig. 3, the electric work machine 1 includes a first operating device 51. The first operating device 51 receives an ON / OFF operation for the power supply. The first operating device 51 may be a starter switch, a multi-stage switch, a key cylinder into which a starter key is inserted, or the like. The first operating device 51 is provided inside the protection mechanism 4 (for example, near the driver's seat 3) and can be operated by an operator seated in the driver's seat 3. The power source is a first battery 41 and / or a second battery 42, and the control device 50 controls the supply of power from the first battery 41 and / or the second battery 42 based on the ON / OFF operation of the first operating device 51.

[0063] When the operator turns on the first operating tool 51, the control device 50 turns on the power and starts up each part of the electric work machine 1. On the other hand, when the operator turns off the first operating tool 51, the control device 50 performs control (shutdown processing) to stop each part of the electric work machine 1 and turns off the power.

[0064] When an operational input is made to the first operating device 51 to switch it from an ON state to an OFF state, the control device 50 turns the power supply to the electric actuator 40 off by cutting off the power supply from at least the first battery 41 to the electric actuator 40.

[0065] For example, when the first operating tool 51 is turned on, the control device 50 switches the power supply to the ON state, allowing power to be supplied from the first battery 41 to the electric actuator 40, and starts (drives) the electric actuator 40 (first activation state: main power supply ON state). At this time, the control device 50 switches the power supply to the ON state, allowing power to be supplied from the second battery 42 to each electrical component (energizing), and starts (drives) each electrical component (second activation state: accessory power supply ON state). Note that the process of switching to the first activation state and the process of switching to the second activation state may be performed in parallel, or one may be performed first before the other.

[0066] Furthermore, when the first operating tool 51 is turned off, the control device 50 turns off the power supply from the first battery 41 to the electric actuator 40, thereby stopping the electric actuator 40 (first stop state: main power supply OFF state). At this time, the control device 50 turns off the power supply from the second battery 42 to each electrical component, thereby stopping each electrical component (second stop state: accessory power supply OFF state).

[0067] The electric work machine 1 is equipped with a state detection device 52. The state detection device 52 is a device that detects the state of various devices, equipment, etc. provided in the electric work machine 1. For example, the state detection device 52 detects the temperature of the hydraulic oil and the rotation speed of the electric actuator 40. The state detection device 52 outputs the detected state information to the control device 50 periodically or at a predetermined timing. In this embodiment, the state detection device 52 includes an oil temperature detection unit 52a that detects the temperature of the hydraulic oil flowing through the hydraulic circuit K, and a rotation speed detection unit 52b that detects the rotation speed of the electric actuator 40. Various known detection means can be used as the configuration of each of these detection units.

[0068] The electric work machine 1 is equipped with a display device 53. The display device 53 is a device that displays various information related to the electric work machine 1. The display device 53 is a fixed display device, a tablet-type terminal device that can display images, or the like. The display device 53 is disposed around the driver's seat 3 within the protection mechanism 4 (for example, in front of the operator).

[0069] The input device 54 is an interface for operating the display device 53. The worker (operator) can switch the display on the display screen of the display device 53 by operating the input device 54. For example, the input device 54 according to this embodiment is a hardware dial (jog dial) arranged around the driver's seat 3. Note that the input device 54 may be a physical operating tool provided on the display device 53, or a touch panel provided on the display device 53 may be employed as the input device 54 to detect touch operations on the display device 53.

[0070] The control device 50 can control the display device 53. The control device 50 periodically acquires information about the electric work machine 1 detected by the BMU 41a, the capacity detection unit 41b, the state detection device 52, etc. When the control device 50 acquires the information about the electric work machine 1, it converts the acquired information into data (images) that can be displayed on the display device 53. The control device 50 displays the converted data on the display device 53.

[0071] Based on predetermined conditions, the control device 50 controls switching of the display screen to be displayed on the display device 53. In the present embodiment, the control device 50 causes the display device 53 to display a normal screen G1, a charging screen G2, a charging setting screen G3, and a shutdown screen G4 as the display screens.

[0072] 4 is a diagram showing an example of the normal screen G1. The normal screen G1 is a screen that shows the state of the electric work machine 1. The display control unit 50c causes the display device 53 to display the normal screen G1 when the power is on. When the electric work machine 1 is operating (when the power is on), the worker can grasp information necessary for operating the electric work machine 1 by visually checking the normal screen G1. For example, the normal screen G1 includes a meter image 61 that shows the temperature of the hydraulic oil, a meter image 62 that shows the temperature of the first battery 41, a meter image 63 that shows the current remaining capacity 71 of the first battery 41, a numerical image 64 that shows the rotation speed of the electric actuator 40, and the like.

[0073] FIG. 5A is a diagram showing an example of the charging screen G2 (G2a). The charging screen G2 is a screen showing charging information for the first battery 41. When an operation input is performed on the first operating tool 51 to switch it from an ON state to an OFF state, the control device 50 causes the display device 53 to display the charging screen G2, including the charging information for the first battery 41. In other words, when the operator performs an operation to turn off the electric work machine 1, the operator can grasp the charging information for the first battery 41 by looking at the charging screen G2 displayed on the display device 53. This allows the operator to easily determine whether or not the first battery 41 needs to be charged before the next time the electric work machine 1 is operated (turned on). Note that the control device 50 may also display the charging screen G2 when a predetermined charging operation (e.g., inserting a charging cable into the charging port 46) is performed.

[0074] The control device 50 displays, as charging information, on the charging screen G2 at least one of the current remaining capacity 71 of the first battery 41, the estimated charging time 73 required to charge the first battery 41 up to a predetermined remaining capacity level 72, and the remaining operable time 74 corresponding to the current remaining capacity 71. The charging information displayed on the charging screen G2 by the control device 50 may also include timer information 75 that defines the start time of charging and the time when the operation of the electric work machine 1 will start (the end time of charging), and charging setting information 76 that indicates the charging current value, power value, etc. during charging.

[0075] The control device 50 displays the current remaining capacity 71 of the first battery 41 on the charging screen G2. The control device 50 acquires the current remaining capacity 71 of the first battery 41 from the capacity detection unit 41b. The control device 50 converts the acquired current remaining capacity 71 (remaining battery capacity) into a numerical image 71a ("55%" in FIG. 5A). The control device 50 displays the numerical image 71a in the center of the charging screen G2. The control device 50 may display the acquired current remaining capacity 71 (remaining battery capacity) in a display format different from the numerical image 71a. For example, on the charging screen G2, a gauge image 71b is arranged below the numerical image 71a, with multiple figures Sa arranged in a horizontal row. The control device 50 converts the current remaining capacity 71 into a gauge display format and displays it on the charging screen G2. Specifically, the control device 50 lights up the multiple figures Sa included in the gauge image 71b, the number of which corresponds to the current remaining capacity 71. As shown in Fig. 5A, on the charging screen G2a, six of the ten symbols Sa are displayed in a lit state from one side (the left side), indicating that the current remaining capacity 71 is between 50% and 60%.

[0076] 5A , the control device 50 may display, on the charging screen G2, an estimated charging time 73 required to charge the first battery 41 to a predetermined remaining capacity level 72. The predetermined remaining capacity level 72 is a numerical value indicating a predetermined percentage (e.g., "30%)." The predetermined remaining capacity level 72 may be defined (stored) in advance in the storage unit 50b, for example. The control device 50 may display, on the charging screen G2, a plurality of remaining capacity levels 72 and an estimated charging time 73 required to charge the first battery 41 to each remaining capacity level 72. The plurality of remaining capacity levels 72 each have a different value, such as "30%, " "50%, " "80%, and "100%," and the levels (percentages) may or may not be defined at equal intervals.

[0077] The control device 50 calculates an estimated charging time 73 based on the current remaining capacity 71 of the first battery 41 detected by the capacity detection unit 41b. The control device 50 has a program (charging time prediction program) for calculating the estimated charging time 73. The charging time prediction program uses the current remaining capacity 71 of the first battery 41 (remaining battery capacity indicated as a percentage and / or battery capacity indicated as a numerical value), the power supplied to the battery during charging, and the remaining capacity level 72 (percentage) as input parameters, and calculates (outputs) an estimated charging time 73 required to charge the first battery 41 up to the remaining capacity level 72.

[0078] The control device 50 inputs the current remaining capacity 71 of the first battery 41 obtained from the capacity detection unit 41b into the charging time prediction program. The control device 50 selects a charging mode table T2 corresponding to the current charging mode from among the charging mode tables T2 stored in the storage unit 50b. The control device 50 references the selected charging mode table T2 and obtains a set value for the power to be supplied to the first battery 41 during charging. The control device 50 inputs the predetermined set value into the charging time prediction program. The control device 50 inputs a predetermined remaining capacity level 72 into the charging time prediction program. The charging time prediction program calculates (outputs) an estimated charging time 73 based on the input parameters. The control device 50 can input multiple remaining capacity levels 72 with different values ​​into the charging time prediction program to calculate the estimated charging time 73 corresponding to each remaining capacity level 72. Note that if a remaining capacity level 72 lower than the current remaining capacity 71 of the first battery 41 is input, the charging time prediction program outputs a value indicating that the estimated charging time 73 is not defined (for example, "-").

[0079] The control device 50 converts the remaining capacity level 72 into a numerical image 72a. The control device 50 displays the converted numerical image 72a above the gauge image 71b. The control device 50 converts the estimated charging time 73 calculated by the charging time prediction program into a numerical image 73a. The control device 50 displays a numerical image 73a of the corresponding estimated charging time 73 below the numerical image 72a of the remaining capacity level 72. As shown in FIG. 5A , on the charging screen G2a, a numerical image 73a "18h" is displayed below the numerical image 72a "100%," indicating that the estimated charging time 73 for charging the first battery 41 to 100% capacity is 18 hours. Furthermore, a numerical image 73a "-" is displayed below the numerical image 72a "30%." This indicates that the current remaining capacity 71 (remaining battery capacity) of the first battery 41 is greater than 30%, and therefore the estimated charging time 73 is not defined.

[0080] The control device 50 may display the remaining capacity level 72 in a display format other than the numerical image 72a. For example, the remaining capacity level 72 may be a balloon figure Fa, which is a frame surrounding a numerical image 73a of the estimated charging time 73. In the charging screen G2a of FIG. 5A , each balloon figure Fa is arranged to point to one of the figures Sa included in the gauge image 71b. This allows the gauge image 71b to function as a scale for the remaining capacity level 72. By associating the balloon figure Fa with the figure Sa of the gauge image 71b, the operator can determine which remaining capacity level 72 the balloon figure Fa represents. Furthermore, by reading the numerical image 73a arranged inside the balloon figure Fa, the operator can determine the estimated charging time 73 required to charge to the corresponding remaining capacity level 72.

[0081] Furthermore, the remaining capacity level 72 is not limited to a predefined value, and may be defined (changed) by an operator operating the display device 53. In this case, when the control device 50 receives an operation by the operator to change the remaining capacity level 72, the control device 50 stores the received value of the remaining capacity level 72 in the storage unit 50b.

[0082] The remaining capacity level 72 may also be a value defined according to the state of the electric work machine 1 detected by the state detection device 52 or the like. For example, the remaining capacity level 72 may be a value defined according to the current remaining capacity 71 (remaining battery capacity) of the first battery 41. Specifically, the multiple remaining capacity levels 72 are values ​​greater than the current remaining capacity 71 (remaining battery capacity) from among "30%, " "50%, " "80%, " and "100%". The multiple remaining capacity levels 72 may also be values ​​greater than the current remaining capacity 71 by a predetermined percentage (for example, 20%) and "100%". In other words, if the current remaining capacity 71 is 55%, the multiple remaining capacity levels 72 are "75%, " "95%, " "100%". In this case, a remaining capacity level calculation program is stored in the memory unit 50b, and the control device 50 can calculate the multiple remaining capacity levels 72 by inputting the state of the electric work machine 1 (for example, the current remaining capacity 71 of the first battery 41) into the remaining capacity level calculation program.

[0083] The control device 50 may display a remaining operable time 74 corresponding to the current remaining capacity 71 of the first battery 41 on the charging screen G2. The control device 50 executes a program that calculates the remaining operable time 74, which is the time during which the working device 20 can be operated, using the remaining capacity 71 (battery capacity) of the first battery 41 as an input parameter, and calculates the remaining operable time 74. The control device 50 converts the calculated remaining operable time 74 into a numerical image 74a. The control device 50 displays the converted numerical image 74a on the charging screen G2. As shown in FIG. 5A , on the charging screen G2a, the numerical image 74a indicating the remaining operable time 74 is arranged below the gauge image 71b.

[0084] 5A , if charging of the first battery 41 starts while the charging screen G2 is being displayed on the display device 53, the control device 50 may display a first image 78 on the charging screen G2, indicating that the first battery 41 is being charged. When the control device 50 enters a charging state in which charging of the first battery 41 is being performed, the control device 50 repeatedly turns on and off the first image 78 at regular intervals (blinks the first image 78). When the control device 50 enters a charging stop state in which charging of the first battery 41 is stopped, the control device 50 turns off the first image 78.

[0085] The control device 50 may change the display format of the charging screen G2 depending on whether the first battery 41 is in a charging stopped state or a charging state, and the method of indicating that the first battery 41 is in a charging state (charging) is not limited to the above description. For example, the control device 50 may indicate that the first battery 41 is being charged by flashing the symbol Sa on the gauge image 71b.

[0086] 5A , the control device 50 may display a second image 79 on the charging screen G2 for inputting an instruction to transition to a charging setting screen G3 for configuring settings related to charging of the first battery 41. When the control device 50 receives an instruction input on the second image 79, it causes the display device 53 to display the charging setting screen G3.

[0087] 6A and 6B are diagrams showing examples of the charge setting screen G3 (G3a, G3b). The charge setting screen G3 is a screen that accepts various setting operations related to charging of the first battery 41. For example, as shown in FIG. 6A, the charge setting screen G3a is a menu screen that displays a list of multiple charge-related settings. When the control device 50 accepts an operation on the charge setting screen G3a, the control device 50 transitions to a screen for selecting the corresponding charge-related setting. For example, when the control device 50 accepts an operation to select a menu for charging speed setting ("Charge Speed"), the control device 50 causes the display device 53 to display the charge setting screen G3b (FIG. 6B) that accepts selection of a charge mode.

[0088] FIG. 7 is a diagram showing an example of the shutdown screen G4. The shutdown screen G4 is a screen indicating that the control device 50 is performing a shutdown process. After the control device 50 starts displaying the charging screen G2 on the display device 53, if a predetermined time has passed without any other instruction input, the control device 50 performs a predetermined shutdown process. Note that the predetermined time is, for example, one minute, but the specific value is merely an example and is not limited to this value. In other words, when the control device 50 receives an instruction input from the operator, it adds the elapsed time from the time the instruction input was received. When the elapsed time exceeds the predetermined time, the control device 50 starts the shutdown process. From the start of the shutdown process until the shutdown process is completed, the control device 50 displays the shutdown screen G4 on the display device 53, indicating that the shutdown process is in progress.

[0089] Next, the transition of the four display screens displayed on the display device 53 will be described.

[0090] 8 is a diagram showing screen transitions on the display device 53 in this embodiment. Events E1 to E8 represent triggers that cause the control device 50 to transition (switch) the display on the display screen of the display device 53.

[0091] When the screen display of the display device 53 is stopped (display stopped state S1), and an operation input is made to the first operating device 51 to switch it from an OFF state to an ON state (event E1), the control device 50 starts up each part of the electric operating machine 1. The control device 50 starts supplying power from the second battery 42 to the display device 53, and causes the display device 53 to display the normal screen G1.

[0092] When the control device 50 is displaying the normal screen G1 on the display device 53 and an operation input is made to the first operating device 51 to switch the first operating device 51 from an ON state to an OFF state (event E2), the control device 50 causes the display device 53 to display a charging screen G2. When the first battery 41 is being charged (event E3), the control device 50 causes the display device 53 to display a first image 78 ( FIG. 5A ), indicating that charging is in progress, on the charging screen G2. When the operator operates the second image 79 ( FIG. 5A ) on the charging screen G2 (event E4), the control device 50 causes the display device 53 to display a charging setting screen G3. After starting to display the charging screen G2 on the display device 53, if a predetermined time has passed without any other instruction input (event E5), the control device 50 stops displaying the charging screen G2. After stopping displaying the charging screen G2, the control device 50 causes the display device 53 to display a shutdown screen G4.

[0093] After displaying the charge setting screen G3 on the display device 53, if a predetermined time elapses without a predetermined instruction being given (event E6), the control device 50 stops displaying the charge setting screen G3. After stopping display of the charge setting screen G3, the control device 50 causes the display device 53 to display a shutdown screen G4. When the shutdown process ends (event E7), the control device 50 causes the display device 53 to enter the display stop state S1.

[0094] That is, after an operation input is made to switch the first operating device 51 from an ON state to an OFF state, the control device 50 continues to supply power from the second battery 42 to the display device 53 until a predetermined time has elapsed, and when the predetermined time has elapsed, the control device 50 cuts off the power supply from the second battery 42 to the display device 53. Note that the predetermined time is, for example, one minute, but the specific value is merely an example and is not limited to this value.

[0095] <First Modification> In the embodiment described above, an example has been described in which the control device 50 displays the estimated charging time 73 corresponding to one charging mode on the charging screen G2a ( FIG. 5A ) when it receives an operation to switch the power to the OFF state. The control device 50 may display the estimated charging time 73 for each charging mode on another charging screen G2 in addition to or instead of the charging screen G2a. Hereinafter, components common to the embodiment described above will be assigned the same reference numerals, and detailed description thereof will be omitted.

[0096] 5B is a diagram showing an example of the charging screen G2 (G2b) in the first modified example. As described above, the control device 50 can switch between two charging modes: a first charging mode that completes charging in a short time, and a second charging mode that charges at a slower rate than the first charging mode.

[0097] The control device 50 calculates the estimated charging time 73 for each of the two charging modes and displays these estimated charging times 73 on the charging screen G2b. The control device 50 executes the above-described charging time prediction program for each of the two charging modes. The control device 50 references the charging mode table T2 stored in the storage unit 50b and acquires a set value for the power to be supplied to the battery during charging. The control device 50 inputs the acquired set value into the charging time prediction program and calculates (outputs) the estimated charging time 73. The control device 50 displays the calculated estimated charging time 73 for each charging mode on the charging screen G2b. As shown in FIG. 5B , the charging screen G2b includes a display image 81 including a remaining capacity level 72 and the corresponding estimated charging time 73 in the first charging mode and a display image 82 including the remaining capacity level 72 and the corresponding estimated charging time 73 in the second charging mode, arranged vertically, along with a numerical image 71a and a gauge image 71b indicating the current remaining capacity 71.

[0098] In addition, if the control device 50 can switch to a charging mode other than the first charging mode and the second charging mode, the control device 50 may display the estimated charging time 73 for all of the switchable charging modes on the charging screen G2b.

[0099] Furthermore, when the control device 50 can suggest an appropriate charging mode (recommended charging mode), the control device 50 may display an estimated charging time 73 in the appropriate charging mode (recommended charging mode) on the charging screen G2b.

[0100] In this case, the control device 50 has a recommended charge mode calculation program that calculates a recommended charge mode using the state of the electric work machine 1 detected by the state detection device 52 or the like as an input parameter. For example, the recommended charge mode calculation program uses the temperature of the first battery 41 as an input parameter, and outputs (defines) that the recommended charge mode is the second charge mode when the input parameter (the temperature of the first battery 41) is greater than a predetermined value. The control device 50 also displays, on the charging screen G2b, a display image including the remaining capacity level 72, the estimated charge time 73, and graphical information indicating that the current charge mode is the current charge mode. The control device 50 also displays, on the charging screen G2b, a display image including the remaining capacity level 72, the estimated charge time 73, and graphical information indicating that the current charge mode is the recommended charge mode.

[0101] This allows the worker to compare the estimated charging time 73 for each charging mode by looking at the charging screen G2b. Therefore, the worker can easily determine which charging mode is appropriate, taking into account the situation until the next time the electric work machine 1 is operated (power is turned on). Furthermore, because the control device 50 can transition from the charging screen G2b to the charge setting screen G3, the worker can easily perform an operation to change the charging mode setting.

[0102] <Second Modification> In the present embodiment and the first modification, the control device 50 has been described as displaying, on the charging screen G2 (G2a, G2b), the estimated charging time 73 required to charge the first battery 41 to the remaining capacity level 72 (percentage). In addition to or instead of the charging screen G2 (G2a, G2b) of the present embodiment and the first modification, the control device 50 may display, on another charging screen G2, an estimated remaining capacity level 92 of the first battery 41 when the first battery 41 is charged for a predetermined charging time 91. In this case, the control device 50 may display a plurality of predetermined charging times 91 on the charging screen G2, and may display the estimated remaining capacity level 92 when the first battery 41 is charged for each predetermined charging time 91. The predetermined charging time 91 is a predefined time. Note that the predetermined charging time 91 is not limited to a predefined time and may be defined (changed) by the operator operating the display device 53.

[0103] In the second modification, the control device 50 calculates the predicted remaining capacity level 92 based on the current remaining capacity 71 of the first battery 41 detected by the capacity detection unit 41b. The control device 50 has a program (remaining capacity level prediction program) for calculating the predicted remaining capacity level 92. The remaining capacity level prediction program uses the current remaining capacity 71 of the first battery 41 (remaining battery capacity indicated as a percentage and / or battery capacity indicated as a numerical value), the power supplied to the battery during charging, and the charging time as input parameters, and calculates (outputs) the predicted remaining capacity level 92 when charging is performed for the input charging time.

[0104] The control device 50 inputs the current remaining capacity 71 of the first battery 41 obtained from the capacity detection unit 41b into the remaining capacity level prediction program. The control device 50 selects a charge mode table T2 corresponding to the current charge mode from among the charge mode tables T2 stored in the storage unit 50b. The control device 50 references the selected charge mode table T2 and obtains a set value for the power to be supplied to the first battery 41 during charging. The control device 50 inputs the obtained set value for power into the remaining capacity level prediction program. The control device 50 inputs a predetermined charging time 91 into the remaining capacity level prediction program. The remaining capacity level prediction program calculates (outputs) an expected remaining capacity level 92 based on the input parameters. The control device 50 can input multiple different predetermined charging times 91 into the remaining capacity level prediction program to calculate the expected remaining capacity level 92 corresponding to each predetermined charging time 91.

[0105] 5C is a diagram showing an example of the charging screen G2 (G2c) in the second modified example. As shown in Fig. 5C, the charging screen G2c includes a numerical image 71a and a gauge image 71b indicating the current remaining capacity 71 of the first battery 41, a numerical image 74a indicating the remaining operable time 74, and the like.

[0106] The control device 50 converts the predetermined charging time 91 into a numerical image 91a. The control device 50 displays the converted numerical image 91a above the gauge image 71b. The control device 50 converts the predicted remaining capacity level 92 calculated by the remaining capacity level prediction program into a numerical image 92a. The control device 50 displays a numerical image 92a of the predicted remaining capacity level 92 below the numerical image 91a of the predetermined charging time 91. As shown in FIG. 5C , the charging screen G2c displays a numerical image 92b of "25%" below the numerical image 91a of "0.5 h," indicating that the predicted remaining capacity level 92 when the first battery 41 is charged for 0.5 hours (30 minutes) is 25%.

[0107] Furthermore, the control device 50 may display the estimated remaining capacity level 92 for each charging mode on the charging screen G2. Fig. 5D is a diagram showing an example of the charging screen G2 (G2d) in the second modified example.

[0108] As described above, the control device 50 can switch between two charging modes: a first charging mode that completes charging in a short time, and a second charging mode that charges at a slower rate than the first charging mode. The control device 50 executes the remaining capacity level prediction program described above for each of the two charging modes. The control device 50 references the charging mode table T2 stored in the memory unit 50b and obtains a set value for the power supplied to the battery during charging. The control device 50 inputs the obtained set value into the remaining capacity level prediction program and calculates (outputs) the predicted remaining capacity level 92.

[0109] As shown in Figure 5D, the charging screen G2d has a display image 93 including the current remaining capacity 71 of the first battery 41, as well as a specified charging time 91 in the first charging mode and a corresponding estimated remaining capacity level 92, and a display image 94 including the specified charging time 91 in the second charging mode and a corresponding estimated remaining capacity level 92, arranged vertically.

[0110] In addition, if the control device 50 is capable of switching to a charging mode other than the first charging mode and the second charging mode, the control device 50 may display the estimated remaining capacity levels 92 of all switchable charging modes on the charging screen G2d, or may be capable of switching the charging mode corresponding to the displayed estimated remaining capacity level 92.

[0111] <Other Modifications> In the embodiment described above, an example has been described in which the control device 50 displays the charging screen G2 when an operation input for switching from the ON state to the OFF state is performed on the first operating device 51. In other modifications, the control device 50 displays the charging screen G2 based on other conditions in addition to the operation input on the first operating device 51.

[0112] FIG. 9 is a screen transition diagram of the display device 53 in this modified example. As shown in FIG. 9 , when the display device 53 is in the display-stopped state S1, if the operator performs a predetermined operation on the input device 54 (event E8), the control device 50 resumes power supply from the second battery 42 to the display device 53. At this time, the control device 50 does not perform startup processing for components other than the display device 53. After resuming power supply to the display device 53, the control device 50 causes the display device 53 to display a charging screen G2. The predetermined operation is, for example, a long press on the input device (jog dial) 54. Note that the predetermined operation is not limited to the input device 54 and may be an operation on a component other than the first component 51. This allows the operator to check the charging information of the first battery 41 without having to perform startup processing for components of the electric work machine 1 even after the shutdown processing is completed and the display device 53 enters the display-stopped state S1.

[0113] Furthermore, in the above-described embodiment, the power ON state is a first activated state (main power ON state) and a second activated state (accessory power ON state), and the power OFF state is a first stopped state (main power OFF state) and a second stopped state (accessory power OFF state), but this is not limiting. For example, the power OFF state may be at least the first stopped state (main power OFF state) or may be the second activated state (accessory power ON state). Furthermore, the power ON state may be at least the second activated state (accessory power ON state) or may be the first stopped state (main power OFF state).

[0114] That is, if the first operating device 51 is a key cylinder or a multi-stage switch that can be switched between a first position for setting the first stopped state and a second stopped state, a second position for setting the first stopped state and a second activated state, and a third position for setting the first activated state and a second activated state, the control device 50 may display the charging screen G2 on the display device 53 when the first operating device 51 is operated from the third position to the second position and an operation input is made to maintain activation (energization) of each electrical component (second activated state) and to stop driving of the electric actuator 40 (first stopped state). Also, the control device 50 may display the charging screen G2 on the display device 53 when the first operating device 51 is operated from the second position to the first position and an operation input is made to stop the activation of the electric actuator 40 and the activation of the electrical components (first stopped state, second stopped state).

[0115] In the above-described embodiment, the charging screen G2 including charging information indicating the current state of the first battery 41 and the charging setting screen G3 for configuring settings related to the charging of the first battery 41 are described as different display screens. However, the control device 50 may accept an operation to configure settings (change settings) related to the charging of the first battery 41 on the charging screen G2. For example, as described above, the charging screen G2b shown in FIG. 5B includes a display image 81 including an estimated charging time 73 in the first charging mode and a display image 82 including an estimated charging time 73 in the second charging mode, arranged vertically. The control device 50 may switch the current charging mode of the first battery 41 by accepting a predetermined operation via the input device 54 while the charging screen G2 is displayed.

[0116] When the control device 50 receives a predetermined operation (e.g., a rotation operation) via the input device 54 (jog dial), it displays, on the charging screen G2, graphical information indicating that either the display image 81 or the display image 82 has been selected. For example, the control device 50 brightens (increases the illuminance) either the display image 81 or the display image 82. This allows the worker to determine which charging mode has been selected on the charging screen G2 based on the difference in brightness between the display images 81 and 82. When the control device 50 receives a predetermined operation (e.g., a long press operation) via the input device 54, it sets the selected charging mode as the current charging mode and stores the selected charging mode in the storage unit 50b. This allows the worker to change the settings related to charging of the first battery 41 while visually checking the charging information for the first battery 41.

[0117] A preferred embodiment of the present invention provides an electric operating machine 1 described in the following items.

[0118] (Item A1) An electric work machine 1 comprising a first battery 41, an electric actuator 40 driven by power supplied from the first battery 41, a first operating device 51 that accepts power ON / OFF operations, a display device 53, and a control device 50 that causes the display device 53 to display a charging screen G2 including charging information for the first battery 41 when an operation input is made to the first operating device 51 to switch it from an ON state to an OFF state.

[0119] The electric work machine 1 according to item A1 can appropriately display the charging information of the first battery 41. Specifically, when the electric work machine 1 is turned off, the operator can check the charging information of the first battery 41 without having to perform a separate charging operation.

[0120] (Item A2) The control device 50 displays on the charging screen G2 the current remaining capacity 71 of the first battery 41 and the estimated charging time 73 required to charge the first battery 41 to a predetermined remaining capacity level 72, in the electric work machine 1 described in Item A1.

[0121] According to the electric operating machine 1 according to item A2, when the electric operating machine 1 is turned off, the operator can easily visually check the current remaining capacity 71 of the first battery 41. This allows the operator to determine whether the current remaining capacity 71 of the first battery 41 is sufficient for the start of the next work (power-on state). Furthermore, since the operator can simultaneously visually check the current remaining capacity 71 of the first battery 41 as well as the estimated charging time 73 required to charge the first battery 41 up to a predetermined remaining capacity level 72, the operator can easily determine when to charge the battery for the start of the next work (power-on state).

[0122] (Item A3) The control device 50 displays multiple remaining capacity levels 72 on the charging screen G2, and also displays the estimated charging time 73 required to charge the first battery 41 to each remaining capacity level 72, as described in Item A2.

[0123] The electric work machine 1 according to item A3 can display detailed charging information for the first battery 41. This allows the operator to visually check and compare the estimated charging times 73 corresponding to a plurality of remaining capacity levels 72. Therefore, by comparing the estimated charging times 73, the operator can check the progress (changes) of the estimated charging times 73 corresponding to the remaining capacity levels 72. This allows the operator to easily determine whether to charge the first battery 41 and how long it should take to charge the first battery 41 up to the remaining capacity level 72.

[0124] (Item A4) The control device 50 is capable of switching between multiple charging modes in which the first battery 41 is charged at different charging speeds, and the electric work machine 1 described in item A2 or A3 displays the estimated charging time 73 for each charging mode on the charging screen G2.

[0125] The electric power tool 1 according to item A4 can display detailed charging information for the first battery 41. This allows the operator to visually check and compare the estimated charging time 73 for each charging mode. This allows the operator to easily determine which of the multiple charging modes can optimally charge the first battery 41. This allows the operator to determine the charging mode taking the estimated charging time 73 into consideration.

[0126] (Item A5) An electric working machine 1 described in any one of items A2 to A4, which is provided with a capacity detection unit 41b that detects the current remaining capacity 71 of the first battery 41, and the control device 50 calculates the expected charging time 73 based on the current remaining capacity 71 of the first battery 41 detected by the capacity detection unit 41b.

[0127] According to the electric work machine 1 relating to item A5, the estimated charging time 73 required to charge the first battery 41 from the current remaining capacity 71 to a predetermined remaining capacity level 72 can be calculated, and the calculated result can be displayed on the display device 53.

[0128] (Item A6) The control device 50 displays on the charging screen G2 the current remaining capacity 71 of the first battery 41 and the predicted remaining capacity level 92 of the first battery 41 when the first battery 41 is charged for a predetermined charging time 91, in an electric work machine 1 described in any one of items A1 to A5.

[0129] According to the electric operating machine 1 according to item A6, when the electric operating machine 1 is turned off, the operator can visually check the current remaining capacity 71 of the first battery 41. This allows the operator to determine whether the current remaining capacity 71 of the first battery 41 is sufficient for the start of the next work (power-on state). Furthermore, the operator can visually check not only the current remaining capacity 71 of the first battery 41 but also the predicted remaining capacity level 92 when the first battery 41 is charged for the specified charging time 91, and therefore can easily grasp the time required to charge the current remaining capacity 71 of the first battery 41 up to the required remaining capacity level 72 for the start of the next work (power-on state).

[0130] (Item A7) The control device 50 displays multiple predetermined charging times 91 on the charging screen G2, and also displays the predicted remaining capacity level 92 when the first battery 41 is charged for each predetermined charging time 91, as described in Item A6.

[0131] The electric power tool 1 according to item A7 can display detailed charging information for the first battery 41. This allows the operator to visually check and compare the estimated remaining capacity levels 92 corresponding to a plurality of predetermined charging times 91. By comparing the corresponding estimated remaining capacity levels 92 based on the predetermined charging times 91, the operator can check how the estimated remaining capacity level 92 changes as the charging time changes. This allows the operator to easily determine whether or not to charge the first battery 41 and when to charge it.

[0132] (Item A8) The control device 50 is capable of switching between multiple charging modes in which the first battery 41 is charged at different charging speeds, and the electric work machine 1 described in item A6 or A7 displays the estimated remaining capacity level 92 for each charging mode on the charging screen G2.

[0133] The electric power tool 1 according to item A8 can display detailed charging information for the first battery 41. This allows the operator to visually check and compare the estimated remaining capacity level 92 for each charging mode. This allows the operator to easily determine which of the multiple charging modes can best charge the first battery 41. This allows the operator to determine the charging mode taking the estimated remaining capacity level 92 into consideration.

[0134] (Item A9) An electric working machine 1 described in any one of items A6 to A8, which is provided with a capacity detection unit 41b that detects the current remaining capacity 71 of the first battery 41, and the control device 50 calculates the predicted remaining capacity level 92 based on the current remaining capacity 71 of the first battery 41 detected by the capacity detection unit 41b.

[0135] According to the electric work machine 1 relating to item A9, the predicted remaining capacity level 92 when the first battery 41 is charged from the current remaining capacity 71 for a specified charging time 91 can be calculated, and the calculated result can be displayed on the display device 53.

[0136] (Item A10) The control device 50 is an electric work machine 1 described in any one of items A1 to A9, in which, when charging of the first battery 41 begins while the charging screen G2 is displayed on the display device 53, a first image 78 indicating that the first battery 41 is being charged is displayed on the charging screen G2.

[0137] According to the electric work machine 1 according to item A10, the operator can visually confirm that the first battery 41 is being charged.

[0138] (Item A11) The control device 50 displays a first image 78 on the charging screen G2 for inputting an instruction to transition to a charging setting screen G3 for making settings related to charging of the first battery 41, and when it accepts an instruction input to the first image 78, it displays the charging setting screen G3 on the display device 53, an electric work machine 1 described in any one of items A1 to A10.

[0139] The electric work machine 1 according to item A11 can appropriately display the charge setting screen G3 for the first battery 41. Specifically, when the worker turns off the power using the first operating tool 51, the worker can visually check the current remaining capacity 71 of the first battery 41 on the charge screen G2 and then input a command to display the charge setting screen G3. This allows the worker to easily make settings related to charging the electric work machine 1 after understanding the current remaining capacity 71 of the first battery 41 at the time of completing work.

[0140] (Item A12) The control device 50 stops displaying the charging screen G2 if a predetermined time has passed without any other instruction input after an operation input to switch the first operating device 51 from the ON state to the OFF state has been made to the display device 53, the electric working machine 1 being described in any one of items A1 to A11.

[0141] According to the electric operating machine 1 according to item A12, the operator can visually confirm that the power supply has been switched off.

[0142] (Item A13) An electric work machine 1 described in Item A12, which is provided with a second battery 42 that supplies power to the display device 53, and the control device 50 continues to supply power from the second battery 42 to the display device 53 until the predetermined time has elapsed after an operational input is made to the first operating device 51 to switch it from the ON state to the OFF state, and cuts off the power supply from the second battery 42 to the display device 53 when the predetermined time has elapsed.

[0143] According to the electric operating machine 1 according to item A13, the operator can visually confirm that the power supply has been switched off by cutting off the power supply to the display device 53. Furthermore, power consumption of the second battery 42 when the power supply is in the off state can be reduced.

[0144] (Item A14) The control device 50 performs a predetermined shutdown process and causes the display device 53 to display a shutdown screen G4 indicating that the shutdown process is in progress until the shutdown process is completed, if a predetermined time has passed without any other instruction input after an operation input is made to the first operating device 51 to switch from the ON state to the OFF state, causing the display device 53 to start displaying the charging screen G2. This electric working machine 1 is described in any one of items A1 to A13.

[0145] According to the electric operating machine 1 according to item A14, the operator can visually confirm that the electric operating machine 1 is being shut down.

[0146] (Item A15) The control device 50 displays the remaining operable time 74 corresponding to the current remaining capacity 71 of the first battery 41 on the charging screen G2, in accordance with any one of items A1 to A14 of the electric work machine 1.

[0147] With the electric work machine 1 according to item A15, when the worker turns the power OFF and finishes work, he or she can grasp the remaining operable time 74 when the next work starts (ON state).

[0148] (Item A16) An electric work machine 1 described in any one of items A1 to A15, comprising hydraulic pumps P1, P2 that discharge hydraulic oil, a hydraulic actuator M that is driven by the hydraulic oil discharged by the hydraulic pumps, and a work device 20 that operates by driving the hydraulic actuator M, wherein the electric actuator 40 is an electric motor that supplies power to the hydraulic pumps.

[0149] According to the electric working machine 1 according to item A16, it is possible to suitably display charging information for the first battery 41 that supplies power to the electric motor for the electric working machine 1 that operates using the power of the electric motor.

[0150] (Item A17) The control device 50 switches the power supply to the OFF state by cutting off the power supply from at least the first battery 41 to the electric actuator 40 when an operation input is made to the first operating device 51 to switch from the ON state to the OFF state, in accordance with any one of items A1 to A16.

[0151] According to the electric operating machine 1 according to item A17, the power supply from the first battery 41 to the electric actuator 40 can be cut off by operating the first operating tool 51.

[0152] Although the present invention has been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. 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.

[0153] 1: Electric work machine 20: Work device 40: Electric actuator 41: First battery 41b: Capacity detection unit 42: Second battery 50: Control device 51: First operating tool 53: Display device 71: Current remaining capacity of first battery 72: Remaining capacity level 73: Estimated charging time 74: Remaining operable time 78: First image 79: Second image 91: Predetermined charging time 92: Estimated remaining capacity level G2 (G2a to G2d): Charging screen G3 (G3a to G3b): Charging setting screen G4: Shutdown screen M: Hydraulic actuator P1, P2: Hydraulic pump

Claims

1. An electric work machine comprising: a first battery; an electric actuator driven by power supplied from the first battery; a first operating device that accepts power ON / OFF operations; a display device; and a control device that causes the display device to display a charging screen including charging information for the first battery when an operation input is made to the first operating device to switch it from an ON state to an OFF state.

2. An electric work machine as described in claim 1, wherein the control device displays on the charging screen the current remaining capacity of the first battery and the estimated charging time required to charge the first battery to a predetermined remaining capacity level.

3. An electric work machine as described in claim 2, wherein the control device displays a plurality of the remaining capacity levels on the charging screen, and also displays the estimated charging time required to charge the first battery to each remaining capacity level.

4. An electric work machine as described in claim 2 or 3, wherein the control device is capable of switching between a plurality of charging modes that charge the first battery at different charging speeds, and the charging screen displays the estimated charging time for each of the charging modes.

5. An electric work machine as described in claim 2 or 3, further comprising a capacity detection unit that detects the current remaining capacity of the first battery, and the control device calculates the expected charging time based on the current remaining capacity of the first battery detected by the capacity detection unit.

6. An electric work machine as described in claim 1, wherein the control device displays on the charging screen the current remaining capacity of the first battery and the predicted remaining capacity level of the first battery when the first battery is charged for a specified charging time.

7. An electric operating machine as described in claim 6, wherein the control device displays a plurality of the predetermined charging times on the charging screen, and also displays the predicted remaining capacity level when the first battery is charged for each of the predetermined charging times.

8. An electric operating machine as described in claim 6 or 7, wherein the control device is capable of switching between a plurality of charging modes in which the first battery is charged at different charging speeds, and the charging screen displays the predicted remaining capacity level for each of the charging modes.

9. An electric operating machine as described in claim 6 or 7, further comprising a capacity detection unit that detects the current remaining capacity of the first battery, and the control device calculates the predicted remaining capacity level based on the current remaining capacity of the first battery detected by the capacity detection unit.

10. An electric work machine as described in claim 1, wherein the control device, when charging of the first battery starts while the charging screen is displayed on the display device, displays a first image on the charging screen indicating that the first battery is being charged.

11. The electric work machine of claim 1, wherein the control device displays a second image on the charging screen for inputting instructions to transition to a charging setting screen for making settings related to charging of the first battery, and when the control device receives instruction input on the second image, causes the display device to display the charging setting screen.

12. The electric work machine according to claim 1, wherein the control device stops displaying the charging screen if a predetermined time has passed without any other instruction input after an operation input to switch the first operating device from the ON state to the OFF state has been made to cause the display device to start displaying the charging screen.

13. An electric work machine as described in claim 12, further comprising a second battery that supplies power to the display device, wherein the control device continues to supply power from the second battery to the display device until the predetermined time has elapsed after an operation input is made to the first operating tool to switch it from the ON state to the OFF state, and cuts off the supply of power from the second battery to the display device when the predetermined time has elapsed.

14. The electric work machine according to claim 1, wherein the control device performs a predetermined shutdown process when a predetermined time has passed without any other instruction input after an operation input to switch the first operating device from the ON state to the OFF state has been made, causing the display device to start displaying the charging screen, and causes the display device to display a shutdown screen indicating that the shutdown process is in progress until the shutdown process is completed.

15. The electric operating machine according to claim 1, wherein the control device causes the charging screen to display the remaining operable time corresponding to the current remaining capacity of the first battery.

16. An electric work machine as described in claim 1, comprising: a hydraulic pump that discharges hydraulic oil; a hydraulic actuator that is driven by the hydraulic oil discharged by the hydraulic pump; and a work device that operates by being driven by the hydraulic actuator, wherein the electric actuator is an electric motor that supplies power to the hydraulic pump.

17. An electric work machine as described in claim 1, wherein the control device switches the power source to the OFF state by cutting off the power supply from at least the first battery to the electric actuator when an operation input is made to the first operating tool to switch it from the ON state to the OFF state.

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