Electric work machine

Abstract

The purpose of the present invention is to provide an electric work machine that appropriately charges a battery during work and during storage.　An electric work machine (1) comprises: a chargeable / dischargeable battery (41); an electric actuator (40) that generates motive power by using electric power discharged from the battery (41); a work device (20) that operates by using the motive power generated by the electric actuator (40); and a control device (50) that can control charging of the battery (41). The control device (50) can switch between a first charging mode (M1) in which charging is performed up to a first target value that corresponds to the charging capacity for performing work by the work device (20), and a second charging mode (M2) in which charging is performed up to a second target value that is lower than the first target value and that corresponds to the charging capacity during storage.

Description

electric work equipment

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

[0002] The electric work machine disclosed in Patent Document 1 includes an electric actuator, a battery that supplies power to the electric actuator, a work device that operates using the driving force of the electric actuator, and a control device. The control device changes the current value of the charging current supplied to the battery based on parameters set in an operation unit.

[0003] International Publication No. 2022 / 270010

[0004] When an electric work machine is used for work, the battery needs to be charged to maintain sufficient remaining capacity for that work. However, when storing or transporting an electric work machine equipped with a battery, it may not be necessary to charge the battery to the required capacity for work. In particular, unlike electric vehicles, electric work machines are often used only during certain seasons. For example, electric work machines such as backhoes are often used less frequently in winter in cold regions due to the frozen ground. Furthermore, electric work machines such as rice planters and combine harvesters tend to be stored for longer periods during their life cycle, such as only being used during planting and harvesting seasons. Furthermore, storing a battery in a fully charged state for a long period of time can lead to battery degradation more easily than when it is only partially charged.

[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 charge the battery during operation and storage.

[0006] An electric work machine according to one aspect of the present invention comprises a rechargeable battery, an electric actuator that generates power using electricity discharged from the battery, a work device that operates using the power generated by the electric actuator, and a control device that can control the charging of the battery, and the control device is switchable between a first charging mode in which the battery is charged up to a first target value that is the charge capacity for performing work using the work device, and a second charging mode in which the battery is charged up to a second target value that is lower than the first target value and is the charge capacity during storage.

[0007] The first target value may be set to a charge capacity that is less than a full charge.

[0008] The control device may be capable of switching to a third charging mode in which charging is performed until the battery is fully charged, in addition to the first charging mode and the second charging mode.

[0009] The control device may control the electric actuator under different control conditions for each charging mode.

[0010] The control device may limit the output of the electric actuator in the second charging mode compared to the first charging mode.

[0011] The electric actuator may be an electric motor, and the control device may limit the rotation speed of the electric motor in the second charging mode compared to the first charging mode.

[0012] The control device may be capable of setting an upper limit rotation speed of the electric motor, and may set the maximum value of the settable range of the upper limit rotation speed lower when in the second charging mode than when in the first charging mode.

[0013] The control device can set the rotation speed of the electric motor above the maximum value by performing a predetermined operation, and when the rotation speed of the electric motor is set above the maximum value, the control device may set the rotation speed of the electric motor below the maximum value after a predetermined time has elapsed or when the predetermined operation is completed.

[0014] The electric work machine may include a hydraulic pump that discharges hydraulic oil using power generated by the electric motor, and a hydraulic actuator that is driven by the hydraulic oil discharged by the hydraulic pump to operate the work device.

[0015] The electric actuator is an electric motor, and the electric work machine includes a hydraulic pump that discharges hydraulic oil using power generated by the electric motor, a hydraulic actuator that is driven by the hydraulic oil to operate the work device, and a traveling device that includes a traveling actuator driven by the hydraulic oil, and when in the second charging mode, the control device may limit the operation of the work device compared to when in the first charging mode, while maintaining the traveling device in a drivable state.

[0016] The amount of electric power charged to the battery per unit time in the second charging mode may be greater than the amount of electric power charged in the first charging mode.

[0017] The electric work machine may be equipped with an input device that accepts input of a selected charging mode and a display device that can display information about the battery, and the control device may determine the recommended charging mode based on operation information of the battery and / or the work machine, and display the determination result on the display device.

[0018] The electric operating machine may include a display device capable of displaying information about the battery, and the control device may cause the display device to display the state of the battery in a different display format for each charging mode.

[0019] The battery may be a lithium ion battery.

[0020] According to the above configuration, by setting the target charge amount during storage (second target value) lower than the target charge amount during operation (first target value), battery deterioration can be suppressed compared to when the battery is stored in a charged state up to the first target value. Furthermore, by setting the target charge amount during operation higher than during storage, the operable time can be extended, improving workability. Therefore, the battery can be appropriately charged during operation and storage.

[0021] 1 is a schematic side view showing the overall configuration of an electric working machine according to the present embodiment; FIG. 2 is an explanatory diagram of a hydraulic circuit of the electric working machine according to the present embodiment; FIG. 3 is a block diagram showing an outline of the configuration of the electric working machine; FIG. 4 is a diagram showing an example of setting information in which a target value (reference value) of charge capacity is defined; FIG. 5 is a diagram showing an example of setting information in which a display format for a charge mode is defined; FIG. 6 is a diagram showing an example of a setting screen; FIG. 7 is a diagram showing an example of a charge screen; FIG. 8 is a diagram showing an example of a display of the current remaining capacity of the battery in the first charge mode; FIG. 9 is a diagram showing an example of a display of the current remaining capacity of the battery in the second charge mode; FIG. 10 is a diagram showing an example of setting information in which a relationship between a charge mode and setting of an upper limit rotation speed by a second operation unit is defined; FIG. 11 is a diagram showing an example of setting information in which hydraulic actuators that can be driven for each charge mode are defined; FIG. 12 is a diagram showing a change in the upper limit rotation speed of an electric actuator; FIG. 13 is a diagram showing an example of a change in the rotation speed of an electric actuator; FIG. 14 is a flowchart of a process for determining a recommended charge mode; FIG. 15 is a diagram showing another example of a setting screen; FIG. 16 is a flowchart showing an example of adjustment control; FIG. 17 is a flowchart showing another example of adjustment control; FIG. 18 is a diagram showing an example of information notified by a notification device; FIG. 1 is a diagram showing an example of setting information in which a target value (reference value) of the charge capacity is defined in Modification 1. FIG. 2 is a diagram showing an example of setting information in which a display format for the charge mode is defined in Modification 1. FIG. 3 is a diagram showing an example of setting information in which a relationship between the charge mode and the setting of the upper limit rotation speed by the second operating unit is defined in Modification 1. FIG. 4 is a diagram showing an example of setting information in which hydraulic actuators that can be driven for each charge mode are defined in Modification 1. FIG. 5 is a diagram showing an example of setting information in which a target value (reference value) of the charge capacity is defined in Modification 2. FIG. 6 is a diagram showing an example of setting information in which a display format for the charge mode is defined in Modification 2. FIG. 7 is a diagram showing an example of setting information in which a relationship between the charge mode and the setting of the upper limit rotation speed by the second operating unit is defined in Modification 2. FIG. 8 is a diagram showing an example of setting information in which hydraulic actuators that can be driven for each charge mode are defined in Modification 2.

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0023] 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.

[0024] As shown in Figure 1, the electric work machine 1 includes a machine body (swivel) 2, a traveling device 10, a working device 20, a battery 41, etc. 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, rear, left, right, and above are provided on top of the machine body 2. The electric work machine 1 includes an input device 5 that accepts operation inputs for the traveling device 10 and the working device 20. The input device 5 is arranged around the driver's seat 3. The operator can operate the input device 5 while seated in the driver's seat 3.

[0025] As shown in Fig. 1, the machine body 2 supports a battery 41. The battery 41 functions as a drive power source (main power source) for the electric work machine 1. In the following description, each device, electrical component, etc. supported by the machine body 2 and supplied with power from the battery 41 may be referred to as "device Z."

[0026] As shown in FIG. 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 traveling actuators driven by hydraulic oil. The traveling actuators are, for example, traveling motors ML and MR configured by hydraulic motors. The traveling device 10 can be, for example, a crawler type or wheel type traveling device.

[0027] 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).

[0028] The working device 20 is provided on the machine body 2. The working device 20 is operated by 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).

[0029] 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.

[0030] 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.

[0031] The electric work machine 1 performs work by operating at least one of 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 actuators (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.

[0032] 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, an unloading valve 31, 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] The control valves PV1 to PV6 are operated in response to the operation of various control levers 5a (FIG. 3) provided on the input 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 of movement of the spool of each control valve V1 to V8 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. Note that the control valves PV1 to PV6 may be solenoid valves that operate based on control signals transmitted from the control device 50 (FIG. 3).

[0037] As shown in FIG. 2 , an unloading valve 31 is provided in the oil passage 30. The unloading valve 31 is a solenoid valve that can be switched between a supply position and a suppression position. When in the supply position, the unloading valve 31 supplies hydraulic oil from the oil passage 30 to the operation valves PV1 to PV6. When in the suppression position, the unloading valve 31 stops the supply of hydraulic oil from the oil passage 30 to the operation valves PV1 to PV6, i.e., prohibits or restricts the operation of the hydraulic actuator M. As a result, when the unloading valve 31 is in the supply position, the operation of the working device 20 is permitted, and when the unloading valve 31 is in the suppression position, the operation of the working device 20 is prohibited or restricted. In this embodiment, the control device 50 ( FIG. 3 ) controls the operation of the unloading valve 31 to switch it between the supply position and the suppression position. While FIG. 3 illustrates one unloading valve 31 for convenience, an unloading valve 31 may be provided for each of the operation valves PV1 to PV6.

[0038] 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).

[0039] 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.

[0040] 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.

[0041] 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 .

[0042] 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.

[0043] As shown in FIG. 3 , the electric work machine 1 includes an electric actuator 40. The electric actuator 40 is electrically connected to a battery 41 via an inverter 42 and a junction box 43. The electric actuator 40 generates power using electricity discharged from the battery 41. As shown in FIG. 2 , the electric actuator 40 is an electric motor that supplies power to hydraulic pumps P1 and P2. In other words, the device Z includes an electric motor (electric actuator 40) that supplies power to the hydraulic pumps P1 and 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 and P2 in this embodiment, it is sufficient that the electric actuator 40 is driven by power supplied from the battery 41 and can operate at least each device included in the electric work machine 1. For example, the electric actuator 40 may be provided in the travel device 10 or the work device 20, and the travel device 10 and / or the work device 20 may be directly driven by the power generated by the electric actuator 40.

[0044] The battery 41 is a rechargeable battery. For example, the battery 41 is a lithium-ion battery. The 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 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).

[0045] The battery 41 is also provided with a BMU (battery management unit) 41a. In the example shown in Fig. 3, the BMU 41a is provided inside the battery 41, but the BMU 41a may be built into the battery 41 or provided outside the battery 41. The battery monitoring function may also be included in the control device 50.

[0046] The BMU 41a monitors and controls the battery 41. Specifically, the BMU 41a controls the opening and closing of a relay provided inside the battery 41 to control the start and stop of power supply from the battery 41. The BMU 41a also detects the temperature, current, voltage, terminal voltage of the internal battery cells, etc. of the battery 41.

[0047] The battery 41 is provided with a capacity detection unit 41b. The capacity detection unit 41b detects (calculates) a current remaining capacity 71 of the battery 41. The current remaining capacity 71 includes at least one of the battery capacity and the remaining battery amount, which indicates the ratio of the battery capacity to the battery capacity when fully charged. The capacity detection unit 41b detects the battery capacity of the battery 41 using a voltage measurement method, for example, based on the terminal voltage of the internal cells of the battery 41 detected by the BMU 41a. Note that the method for detecting the battery capacity of the 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 battery 41 when fully charged. The capacity detection unit 41b calculates the remaining battery amount based on the battery capacity when fully charged and the detected battery capacity of the 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.

[0048] As shown in FIG. 3 , the electric work machine 1 includes an inverter 42 , a junction box 43 , a DC / DC converter 44 , a low-voltage battery 45 , a charging port 46 , a charger 47 , and a connection unit 48 .

[0049] The inverter 42 is a motor drive device that supplies power from the battery 41 to the electric actuator 40 to drive the electric actuator 40. The inverter 42 is electrically connected to the electric actuator 40 and the junction box 43. The inverter 42 converts DC power input from the battery 41 via the junction box 43 into three-phase AC power and supplies the three-phase AC power to the electric actuator 40, thereby driving the electric actuator 40. The inverter 42 can also adjust the current and voltage of the power supplied to the electric actuator 40 as desired. The control device 50 controls the operation of the inverter 42 to drive or stop the electric actuator 40 (electric motor). The control device 50 also controls the operation of the inverter 42 to change the rotation speed R of the electric actuator 40 (electric motor). In this embodiment, the maximum value of the rotation speed R is set by changing a set value Rmax (e.g., 2600 rpm).

[0050] In addition to the inverter 42, the junction box 43 is electrically connected to the battery 41, the DC / DC converter 44, and the charger 47. The junction box 43 outputs the power output from the battery 41 to the inverter 42 and the DC / DC converter 44. The junction box 43 also outputs the power input from the charger 47 to the battery 41. The control device 50 controls the opening and closing of a relay provided inside the junction box 43 to switch between the power supply destination and the power supply source.

[0051] The DC / DC converter 44 is a voltage conversion device that converts the voltage of the direct current input from the battery 41 via the junction box 43 into a different voltage. In this embodiment, the DC / DC converter 44 is a step-down converter that converts the high voltage of the battery 41 into a predetermined low voltage that is appropriate for the electrical components provided in the electric work machine 1. The DC / DC converter 44 supplies power to the low-voltage battery 45 after voltage conversion.

[0052] The low-voltage battery 45 is a secondary battery capable of storing electricity at a lower voltage than the battery 41. The low-voltage battery 45 functions as an accessory power supply that supplies power to electrical components and the like provided on the electric work machine 1. The low-voltage battery 45 is electrically connected to the battery 41 via the junction box 43 and the DC / DC converter 44. The low-voltage battery 45 is charged with power discharged from the battery 41. The low-voltage battery 45 also supplies power to a connection unit 48, a heating and cooling device 51, and the like, which will be described later. When a starter switch 5d included in the input device 5 is turned ON, the low-voltage battery 45 supplies power to the electrical components and the like provided on the electric work machine 1 (the accessory power supply is turned ON). When the starter switch 5d is turned OFF, the low-voltage battery 45 cuts off (stops) the power supply to the electrical components and the like (the accessory power supply is turned OFF). In addition, the main ECU of the control device 50, which controls the overall operation of the electric work machine 1, operates by constantly receiving power from the low-voltage battery 45.

[0053] Charging port 46 has a connector into which a charging cable is fitted and a connection detection sensor 46a. Charging port 46 is connected to an external power source (such as a commercial power source or a quick charger) via the charging cable. When connection detection sensor 46a detects that a charging cable is connected to charging port 46, control device 50 switches to a charging state in which power is supplied to battery 41. When connection detection sensor 46a detects that a charging cable is not connected to charging port 46, control device 50 switches to a charging stop state in which power is not supplied to battery 41.

[0054] The charger 47 is a device that charges the battery 41. The charger 47 is electrically connected to the charging port 46 and the junction box 43, converts three-phase AC power input from an external power source via the charging cable and the charging port 46 into DC power, and supplies the DC power to the junction box 43. The 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 the junction box 43.

[0055] 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 43, and charges the 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 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.

[0056] The connection unit 48 is a device (terminal) that can be connected to an external power storage device Y. The connection unit 48 includes a connector to which a cable is fitted and a relay. The connection unit 48 is electrically connected to the low-voltage battery 45. When the accessory power supply is ON, the relay of the connection unit 48 is closed. As a result, the power of the low-voltage battery 45 is output (discharged) to the external power storage device Y via the cable fitted to the connector of the connection unit 48. On the other hand, when the accessory power supply is OFF, the relay of the connection unit 48 is opened. As a result, the power of the low-voltage battery 45 is not output (discharged) to the power storage device Y. Because the connection unit 48 discharges the power discharged from the battery 41 via the low-voltage battery 45 to the power storage device Y, the connection unit 48 can also be considered a device Z.

[0057] The external power storage device Y is, for example, a device having a rechargeable battery (lithium ion battery, nickel-metal hydride battery, nickel-cadmium battery, etc.), and examples thereof include a smartphone, a personal computer, a mobile battery, etc. Furthermore, the connection unit 48 may be capable of outputting to an electronic device that is driven by electric power other than the power storage device Y having a rechargeable battery.

[0058] As shown in Figure 3, the electric work machine 1 is equipped with a heating and cooling device 51. The heating and cooling device 51 is a device that conditions the air inside the protection mechanism (cabin) 4. The heating and cooling device 51 is operated by power from the low-voltage battery 45. Because the heating and cooling device 51 is supplied with power discharged from the battery 41 via the low-voltage battery 45, the heating and cooling device 51 can also be considered as device Z.

[0059] The heating and cooling equipment 51 has an electric heater for its heating function. The electric heater has an electric heating wire and a blower. The electric heating wire generates high heat when electricity is applied. The blower blows the surrounding air heated by the electric heating wire toward the inside of the protection mechanism 4. The heating and cooling equipment 51 has an air conditioner for its cooling function. The air conditioner has a heat exchanger and a blower. A refrigerant (air conditioning gas) flows inside the heat exchanger. The blower blows the surrounding air cooled by the heat exchanger toward the inside of the protection mechanism 4. The heating and cooling equipment 51 has an electronic circuit that switches the electric heater and the air conditioner between ON (operation) and OFF (stop). The control device 50 can switch the heating function and the cooling function of the heating and cooling equipment 51 between operation and stop by sending an instruction signal to the electronic circuit.

[0060] 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. The state detection device 52 includes various sensors arranged in various parts of the electric work machine 1 and a program that calculates the state of the electric work machine 1 from sensing data acquired by the various sensors. The program is stored in the memory unit 50b of the control device 50, and functions are realized when the processor 50a executes the program.

[0061] For example, the state detection device 52 detects the rotation speed R of the electric actuator 40, operation information of the battery 41 and / or the working device 20, etc. In this embodiment, the state detection device 52 includes a rotation speed detection unit 52a that detects the rotation speed R of the electric actuator 40. The state detection device 52 also includes an operation information detection unit 52b. The operation information detection unit 52b periodically acquires the remaining capacity 71 of the battery 41 from the capacity detection unit 41b. The operation information detection unit 52b stores the acquired remaining capacity 71 of the battery 41 and the acquired time information in the memory unit 50b as battery operation information. The operation information detection unit 52b also periodically acquires the rotation speed R of the electric actuator 40 from the rotation speed detection unit 52a. The operation information detection unit 52b stores the acquired rotation speed R of the electric actuator 40 and the acquired time information in the memory unit 50b as working device operation information. The configuration of each of these detection units in the state detection device 52 can be various known detection means. The state detection device 52 outputs the detected state information to the control device 50 periodically or at a predetermined timing.

[0062] 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 (for example, in front of the operator seated in the driver's seat 3). The display device 53 is powered by power from the low-voltage battery 45. The control device 50 can control the display device 53. The control device 50 periodically acquires information related to 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 related to 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.

[0063] The electric work machine 1 is equipped with an alarm device 54. The alarm device 54 is a device that notifies the user of the status of the electric work machine 1. The alarm device 54 is powered by the low-voltage battery 45. In this embodiment, the alarm device 54 is a speaker provided in the display device 53 (display device). The control device 50 can cause the alarm device 54 to notify (output) audio information indicating the status of the electric work machine 1 by sending an instruction signal to the alarm device 54. The alarm device 54 may also be a light provided in the machine body 2. In this case, the control device 50 sends an instruction signal to the alarm device 54 (light) to control the light to be turned on or to be repeatedly turned on and off at predetermined intervals. The alarm device 54 may also be the display device 53, which is a display device. In this case, the control device 50 sends an instruction signal to the display device 53 (alarm device 54) to notify (output) an image indicating the status of the electric work machine 1.

[0064] As shown in Fig. 3, the input device 5 has an operating lever 5a, a first operating unit 5b, a second operating unit 5c, and a starter switch 5d. The operating lever 5a is a plurality of operating tools for operating the traveling device 10 and the working device 20. The operating lever 5a includes a group of sensors that detect the amount of operation, the direction of operation, etc. The group of sensors inputs the amount of operation and the direction of operation to the control device 50 in accordance with the operation of the corresponding operating lever 5a. The control device 50 can control the operation of the traveling device 10 and the working device 20 based on the amount of operation and the direction of operation obtained by the group of sensors.

[0065] The first operation unit 5b is an operating tool for operating the display device 53. The worker (operator) operates the first operation unit 5b to select an image (e.g., an icon image) displayed on the display device 53 and instruct (input) the execution of an operation corresponding to the image. When the control device 50 receives an operation input from the first operation unit 5b, the control device 50 performs control corresponding to the received operation input. For example, the first operation unit 5b according to this embodiment is a hardware dial (jog dial) disposed around the driver's seat 3. Note that the first operation unit 5b 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 first operation unit 5b to detect touch operations on the display device 53.

[0066] The second operation unit 5c is a push-button type operation switch used to set the upper limit rotation speed Rlim of the electric actuator 40. The control device 50 can set the upper limit rotation speed Rlim of the rotation speed R of the electric actuator 40 (electric motor) by operating the second operation unit 5c. In this embodiment, the second operation unit 5c includes a plurality of operation switches 5c1 to 5c3. The operation switch 5c1 accepts, as a "power mode," setting the upper limit rotation speed Rlim to a maximum set value Rmax. The operation switch 5c2 accepts, as a "normal mode," setting the upper limit rotation speed Rlim to a predetermined set value Rth (e.g., 2100 rpm). The operation switch 5c3 accepts, as an "eco mode," setting the upper limit rotation speed Rlim to a minimum set value Rmin (e.g., 1800 rpm). In this embodiment, the magnitude relationship between the set values ​​Rmax, Rth, and Rmin is Rmax > Rth > Rmin. When the control device 50 receives an operation input from the second operation unit 5c, it switches the upper limit rotation speed Rlim of the electric actuator 40 in accordance with the received operation input. The configuration of the second operation unit 5c is not limited to the above-described configuration. The second operation unit 5c may be configured to switch the upper limit rotation speed Rlim in stages by operation by the operator, and may be, for example, a dial-type rotary operation tool.

[0067] The starter switch 5d is operated to start and stop the electric working machine 1. More specifically, by turning the starter switch 5d ON, the control device 50 starts each part of the electric working machine 1. By turning the starter switch 5d OFF, the control device 50 stops each part of the electric working machine 1.

[0068] The control device 50 can change various settings related to charging of the battery 41. For example, the control device 50 can change the setting of a target value for the charge capacity of the battery 41 during charging.

[0069] First, the relationship between the charge capacity and deterioration of the battery 41 included in the electric work machine 1 according to this embodiment will be described. If the charge capacity of the battery 41 remains close to full charge (100%) for a long period of time, the likelihood of deterioration of the battery 41 increases. On the other hand, if the battery 41 is not used for a long period of time, the charge capacity of the battery 41 gradually decreases (natural discharge occurs). If the battery 41 remains close to full discharge (0%) for a long period of time, the likelihood of deterioration of the battery 41 increases. Therefore, the electric work machine 1 according to this embodiment can switch (change) the target value of the charge capacity of the battery 41 through operational input by the operator.

[0070] As shown in Fig. 3, the control device 50 has a charging control unit 50c. The charging control unit 50c is a control program pre-stored in the storage unit 50b. As shown in Fig. 4A, the storage unit 50b pre-stores setting information D1 in table format, which defines charging modes and target values ​​(reference values) of charging capacities corresponding to the charging modes. Upon receiving an operation input from an operator, the charging control unit 50c can switch the charging mode by referring to the setting information D1.

[0071] The control device 50 (charging control unit 50c) can switch between a first charging mode M1 in which charging is performed up to a first target value (first reference value), which is the charge capacity for performing work by the work device 20, and a second charging mode M2 ​​in which charging is performed up to a second target value (second reference value), which is lower than the first target value (first reference value) and is the charge capacity during storage. In the following description, the target values ​​(first target value, second target value) may be referred to as reference values.

[0072] As shown in FIG. 4A , the setting information D1 indicates that the first target value in the first charging mode M1 is set to a charge capacity lower than a full charge. For example, the first target value is set to 80%. For example, the first target value is set to a value that makes the battery 41 less susceptible to deterioration than a full charge. Note that the first target value is not limited to a specific value as long as it is lower than a full charge and ensures a charge capacity sufficient to operate the working device 20 and perform work. For example, the first target value may be set to 90% or 75%.

[0073] The setting information D1 specifies that the second target value in the second charge mode M2 ​​is set to a range that prevents the battery 41 from completely discharging due to natural discharge even if the battery 41 is not charged for a relatively long period of time. For example, the second target value is set to 40%. The second target value is not limited to any particular value as long as it ensures a charge capacity that prevents the battery 41 from completely discharging even if the battery 41 is not charged for a long period of time (e.g., several months to a year). For example, the second target value may be set to 50% or 30%. The second target value may also be a charge capacity specified for safety purposes when transporting an electric work machine 1 equipped with the battery 41 (lithium ion battery). The input device 5 may accept input from the operator, and the control device 50 may be able to change the second target value as appropriate. This allows the operator to set any second target value according to transport regulations.

[0074] When the battery 41 is charged by the charger 47, if the current remaining capacity 71 of the battery 41 is smaller than the reference value set for the switched charging mode, the control device 50 (charging control unit 50c) controls the battery 41 to be charged up to the reference value. Furthermore, if the current remaining capacity 71 of the battery 41 is smaller than the reference value (second reference value) changed in response to an operational input from the operator, the charging control unit 50c controls the battery 41 to be charged up to the reference value.

[0075] The setting information D1 also includes a third target value for the third charging mode M3. The third target value is 100%, which corresponds to full charge. The control device 50 (charging control unit 50c) can switch to the third charging mode M3, which charges the battery to full charge (100%), separately from the first charging mode M1 and the second charging mode M2.

[0076] The control device 50 can also be said to have a normal charging mode (first charging mode M1 or third charging mode M3) in which charging is performed up to a predetermined reference value (first reference value or full charge), and a storage charging mode (second charging mode) M2 in which charging is performed up to a second reference value that is lower than the reference value in the normal charging mode. In the following description, the first charging mode M1 or the third charging mode M3 may be referred to as the normal charging mode M1 or M3, and the second charging mode M2 ​​may be referred to as the storage charging mode M2.

[0077] When the charging control unit 50c detects that a charging cable is connected to the charging port 46, it obtains the current remaining capacity 71 of the battery 41 from the capacity detection unit 41b. The charging control unit 50c also references the storage unit 50b to obtain the current charging mode. The charging control unit 50c references the setting information D1 to obtain a reference value corresponding to the current charging mode. The charging control unit 50c compares the current remaining capacity 71 of the battery 41 with the reference value to determine which is smaller. When the charging control unit 50c determines that the current remaining capacity 71 of the battery 41 is less than the reference value for the current charging mode, it transmits an instruction signal including the reference value to the charger 47 to charge the battery 41.

[0078] The charge control unit 50c controls the amount of charging power per unit time supplied to the battery 41 based on the charging mode. The amount of charging power per unit time (power setting value) for each charging mode is defined in advance in a charging mode table Tm stored in the storage unit 50b. When the control device 50 starts charging the battery 41, it references the charging mode table Tm and acquires the power setting value corresponding to the currently selected charging mode. 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 battery 41.

[0079] The charging mode table Tm defines a higher amount of charging power per unit time to the battery 41 in the second charging mode M2 ​​than in the first charging mode M1. When the amount of charging power per unit time supplied to the battery 41 is larger, the time required to charge the battery 41 to a predetermined target value is shorter. However, as the amount of charging power per unit time increases, the temperature of the battery 41 rises. When the temperature of the battery 41 rises, the amount of power discharged (output) from the battery 41 is limited. Therefore, if a task consuming a large amount of power is performed immediately after charging is completed, the limitation on the amount of power discharged from the battery 41 may hinder the task. However, immediately after charging is completed in the second charging mode M2, the battery 41 is not discharged with a large amount of power, but is stored (left unused for a long period of time). Therefore, even if the temperature of the battery 41 rises due to charging, there is no need to consider workability because no work is performed thereafter. Therefore, in the second charging mode M2, priority is given to short-term charging. This allows the operator to efficiently perform charging tasks.

[0080] The control device 50 causes the display device 53 to display information relating to the battery 41. The input device 5 (first operation unit 5b) accepts a selection input of a charging mode.

[0081] FIG. 5 shows an example of the setting screen G1. The setting screen G1 is a screen that accepts various setting operations related to charging of the battery 41. When the operator performs a predetermined operation, the control device 50 causes the display device 53 to display the setting screen G1. The setting screen G1 displays a button b1 for selecting a first charging mode M1 ("Battery Care"), a button b2 for selecting a second charging mode M2 ​​("Long Storage"), and a button b3 for selecting a third charging mode M3 ("Normal"). When the control device 50 accepts a predetermined operation (e.g., a rotation operation) on the first operation unit 5b (jog dial), it displays graphical information indicating that one of the buttons b1 to b3 has been selected on the setting screen G1. When the control device 50 accepts a predetermined operation (e.g., a long press operation) on the first operation unit 5b, it sets the selected charging mode as the changed (current) charging mode and stores the changed charging mode in the storage unit 50b.

[0082] 6 is a diagram showing an example of a charging screen G2. The charging screen G2 is a screen that shows the state of the battery 41. When the worker performs a predetermined operation, the control device 50 causes the display device 53 to display the charging screen G2. The charging screen G2 includes a current remaining capacity 71 (a numerical image 71a and a gauge image 71b) of the battery 41, a remaining operable time 72 corresponding to the current remaining capacity 71, timer information 73 that defines the start time of charging and the start time of operation of the electric work machine 1 (the end time of charging), and charging setting information 74 that shows the charging current value, power value, etc. during charging.

[0083] The control device 50 may display the state of the battery 41 in a different display format for each charging mode on the display device 53. As shown in Fig. 4B, the storage unit 50b stores in advance, in table format, setting information D2 that defines charging modes and display formats corresponding to the charging modes.

[0084] When the current charging mode is the third charging mode M3, which allows charging to a full charge, the control device 50 displays a charging screen G2 as shown in FIG. 6 . The control device 50 acquires the current remaining capacity 71 of the battery 41 from the capacity detection unit 41b. The control device 50 converts the acquired current remaining capacity 71 (remaining battery capacity) into a blue numerical image 71a ("55%" in FIG. 6 ) based on the display color of the setting information D2. The control device 50 displays the numerical image 71a in the center of the charging screen G2. The control device 50 displays the acquired current remaining capacity 71 (remaining battery capacity) in a different display format from the numerical image 71a. On the charging screen G2, a gauge image 71b, in which multiple figures Sa are arranged horizontally, is located below the numerical image 71a. The control device 50 converts the current remaining capacity 71 of the battery 41 into a gauge display format and displays it on the charging screen G2. Specifically, the control device 50 displays ten symbols Sa based on the gauge number in the setting information D2. The control device 50 lights up the number of symbols Sa corresponding to the current remaining capacity 71 in blue based on the display color in the setting information D2. As shown in Fig. 6, the charging screen G2 displays ten symbols Sa, with six symbols Sa lit in blue from one side (the left). This indicates that the current remaining capacity 71 is between 50% and 60%.

[0085] 7A is a diagram showing an example of the display of the current remaining capacity 71 of the battery 41 in the first charging mode M1. As shown in FIG. 7A, the control device 50 converts the acquired current remaining capacity 71 (remaining battery power) into a yellow numerical image 71a ("20%" in FIG. 7A) based on the display color of the setting information D2. The control device 50 displays eight figures Sa based on the number of gauges in the setting information D2. The control device 50 lights up the two figures Sa corresponding to the current remaining capacity 71 in yellow based on the display color of the setting information D2.

[0086] 7B is a diagram showing an example of the display of the current remaining capacity 71 of the battery 41 in the second charging mode M2. As shown in FIG. 7B, the control device 50 converts the acquired current remaining capacity 71 (remaining battery power) into a red numerical image 71a ("10%" in FIG. 7B) based on the display color of the setting information D2. The control device 50 displays four figures Sa based on the number of gauges in the setting information D2. The control device 50 lights up one figure Sa corresponding to the current remaining capacity 71 in red based on the display color of the setting information D2.

[0087] The display format of the charging screen G2 is not limited to the above description, as long as it allows the current charging mode and the state of the battery 41 to be visually recognized. For example, the control device 50 may change the background color of the area displaying the remaining capacity 71 of the battery 41 for each charging mode.

[0088] As shown in FIG. 3 , the control device 50 includes a rotation speed control unit 50d. The rotation speed control unit 50d is a control program pre-stored in the memory unit 50b. As described above, the electric work machine 1 in this embodiment can select the second charge mode M2, which charges the electric work machine 1 at a low charge capacity suitable for storage and transportation. Therefore, if an operator operates the electric work machine 1 after charging in the second charge mode M2 ​​and outputs (discharges) power from the battery 41, there is a risk that the battery 41 will be completely discharged and the electric work machine 1 will no longer be able to operate. Therefore, the rotation speed control unit 50d (control device 50) controls the electric actuator 40 under different control conditions for each charge mode. In the second charge mode M2, the control device 50 (rotation speed control unit 50d) limits the output of the electric actuator 40 more than in the first charge mode M1.

[0089] The control device 50 (rotation speed control unit 50d) limits the rotation speed R of the electric motor, which is the electric actuator 40, based on the charging mode. In this embodiment, in the first charging mode M1, the range of the rotation speed R of the electric actuator 40 is 0<R≦Rth. In the second charging mode M2 ​​during storage, the range of the rotation speed R of the electric actuator 40 is 0<R≦Rmin. Because Rmin<Rth, the upper limit of the range of the rotation speed R in the second charging mode M2 ​​is more limited than in the first charging mode M1. Note that in the third charging mode M3, in which charging to full charge is possible, the range of the rotation speed R of the electric actuator 40 is 0<R≦Rmax.

[0090] FIG. 8A shows an example of setting information D3 that defines the relationship between the charging mode and the setting of the upper limit rotation speed Rlim using the second operation unit 5c (operation switches 5c1 to 5c3). The setting information D3 defines the control conditions for the electric actuator 40 for each charging mode. The storage unit 50b pre-stores the setting information D3. When the rotation speed control unit 50d receives an operation input from the second operation unit 5c, it references the setting information D3 and sets the upper limit rotation speed Rlim of the rotation speed R of the electric actuator 40. As described above, when the control device 50 receives an operation input from any of the operation switches 5c1 ("power mode"), 5c2 ("normal mode"), and 5c3 ("eco mode"), it sets the upper limit rotation speed Rlim of the rotation speed R of the electric actuator 40 to the setting values ​​Rmax, Rth, and Rmin corresponding to the operation switches 5c1 to 5c3.

[0091] The "◯" in the setting information D3 indicates that the upper limit rotation speed Rlim is set according to the operation input using the second operation unit 5c (operation switches 5c1 to 5c3). The "X" in the setting information D3 indicates that the upper limit rotation speed Rlim is not set according to the operation input using the second operation unit 5c (operation switches 5c1 to 5c3), but is set to a different value.

[0092] In the third charging mode M3, which allows charging to full charge, when the rotation speed control unit 50d receives an operation input from the second operation unit 5c, it sets the upper limit rotation speed Rlim to the setting values ​​Rmax, Rth, and Rmin corresponding to the received operation input.

[0093] In the second charging mode M2, which is a charging mode during storage, when the rotation speed control unit 50d receives an operation from the operation switch 5c3 ("eco mode"), it sets the set value Rmin corresponding to the operation switch 5c3 as the upper limit rotation speed Rlim of the electric actuator 40. On the other hand, even if the operation switch 5c1 ("power mode") or the operation switch 5c2 ("normal mode") is operated, the rotation speed control unit 50d does not change the upper limit rotation speed Rlim to the set values ​​Rmax and Rth corresponding to the operation switches 5c1 and 5c2. The rotation speed control unit 50d sets the upper limit rotation speed Rlim to a predetermined value R1. The predetermined value R1 is, for example, Rmin, which is the upper limit of the range of the rotation speed R in the second charging mode M2.

[0094] On the other hand, it is conceivable that the worker may want to temporarily increase the power discharged from the battery 41 when performing work using the work device 20. For this reason, the control device 50 (rotation speed control unit 50d) may be configured to allow the rotation speed R of the electric actuator 40 (electric motor) to be temporarily set above the maximum value (the upper limit of the range of the rotation speed R) by performing a predetermined operation. The predetermined operation may be, for example, an operation on the second operation unit 5c or an operation on another operation unit included in the input device 5. If the rotation speed control unit 50d sets the rotation speed R of the electric actuator 40 (electric motor) above the maximum value, the rotation speed control unit 50d sets the rotation speed R of the electric motor to less than or equal to the maximum value when the predetermined operation is completed or after a predetermined time has elapsed.

[0095] When the operator changes the upper limit rotation speed Rlim to a value that exceeds the upper limit of the range of rotation speeds R that can be set in the charging mode, the rotation speed control unit 50d sets the upper limit rotation speed Rlim according to the operator's input. When a predetermined time t1 has elapsed since the upper limit rotation speed Rlim was set (changed), the rotation speed control unit 50d sets (changes) the upper limit rotation speed Rlim to a value based on the charging mode. The predetermined time t1 is, for example, 15 minutes, but the value is not limited to this.

[0096] As shown in Fig. 8A, "△" in setting information D3 indicates that after the upper limit rotation speed Rlim is set according to the operation input by the second operation unit 5c, when a predetermined time t1 has elapsed, the upper limit rotation speed Rlim is set to the upper limit of the range of rotation speeds R that can be set in the charge mode. "△" is assigned when a setting value that is one step higher than the upper limit of the range of rotation speeds R that can be set in the charge mode is set. Specifically, "△" is assigned when the charge mode is the first charge mode M1 and the operation switch 5c1 is operated.

[0097] FIG. 9A is a diagram illustrating changes in the upper limit rotation speed Rlim of the electric actuator 40. As shown in FIG. 9A , when the rotation speed control unit 50d receives an operation input from the operation switch 5c1 ("power mode"), it sets the upper limit rotation speed Rlim to a set value Rmax corresponding to the operation switch 5c1. The set value Rmax corresponding to the operation switch 5c1 is greater than the upper limit Rth of the range of the rotation speed R in the first charging mode M1. When a predetermined time t1 has elapsed since receiving the input operation from the operation switch 5c1, the rotation speed control unit 50d changes the upper limit rotation speed Rlim to a value equal to or less than Rth. Note that the rotation speed control unit 50d may also change the upper limit rotation speed Rlim to a value equal to or less than the maximum value when a predetermined time t1 has elapsed since receiving an operation input to the working device 20 via the operation lever 5a (when the working device 20 actually starts working).

[0098] Furthermore, as a control condition of "△" in the setting information D3, the rotation speed control unit 50d may control the electric actuator 40 to temporarily exceed the upper limit of the range of the rotation speed R from the start to the end of a predetermined operation. FIG. 9B is a diagram illustrating an example of a change in the rotation speed R of the electric actuator 40. FIG. 9B shows the amount of change in the rotation speed R resulting from a predetermined operation in the first charging mode M1. As shown in FIG. 9B , the rotation speed control unit 50d controls the rotation speed R to increase to a set value Rmax, which is one step higher than the upper limit rotation speed Rlim (Rth), during a predetermined time t2 during which the predetermined operation is performed (e.g., while the operator is pressing and holding the operation unit included in the input device 5). When the rotation speed control unit 50d receives that the predetermined operation has ended (when the operator releases his / her finger from the operation unit and ends the long press), it controls the rotation speed R to decrease to the upper limit rotation speed Rlim (set value Rth), which is the upper limit of the rotation speed R that can be set in the first charging mode M1.

[0099] In addition, the rotation speed control unit 50d may acquire the actual rotation speed R from the rotation speed detection unit 52a, calculate the cumulative value of the operating time during which the actual rotation speed R exceeds the maximum value, and when the cumulative value exceeds a predetermined time t1, change the upper limit rotation speed Rlim to below the maximum value.

[0100] In addition, if the rotation speed control unit 50d sets the rotation speed R of the electric actuator 40 (electric motor) above the maximum value, it may set the rotation speed R of the electric motor below the maximum value if the remaining capacity 71 of the battery 41 becomes smaller than a predetermined value.

[0101] Furthermore, the rotation speed control unit 50d may perform control such that the amount of change in the rotation speed R of the electric actuator 40 varies for each charging mode. Fig. 9C is a diagram illustrating another example of the change in the rotation speed R of the electric actuator 40. Fig. 9C shows the amount of change when the rotation speed R increases to the upper limit rotation speed Rlim when the upper limit rotation speed Rlim is the same for each charging mode.

[0102] 9C , in the third charging mode M3 and the first charging mode M1, the rotation speed R of the electric actuator 40 increases significantly and reaches the upper limit rotation speed Rlim. On the other hand, in the second charging mode M2, which is intended for storage, the rotation speed R of the electric actuator 40 increases gradually and reaches the upper limit rotation speed Rlim. As a result, the time t4 until the electric actuator 40 reaches the upper limit rotation speed Rlim in the second charging mode M2 ​​is longer than the time t3 until the electric actuator 40 reaches the upper limit rotation speed Rlim in the third charging mode M3 and the first charging mode M1. This allows the operator to recognize when performing work that the currently set charging mode is a charging mode not intended for work (a charging mode intended for storage).

[0103] Furthermore, in the second charging mode M2, the rotation speed control unit 50d may limit the operation of the working device 20 compared to the first charging mode M1, while maintaining the traveling device 10 in a drivable state. FIG. 8B is a diagram showing an example of setting information D4 in which the hydraulic actuators M that can be driven for each charging mode are defined. The setting information D4 is the control conditions for the hydraulic actuators M for each charging mode. The setting information D4 is stored in advance in the memory unit 50b. The rotation speed control unit 50d refers to the setting information D4, switches the control conditions for the hydraulic actuators M, and controls the hydraulic actuators M.

[0104] In the setting information D4, "◯" indicates that the corresponding hydraulic actuator M is operated, and "×" indicates that the corresponding hydraulic actuator M is not operated. As shown in FIG. 8B , the setting information D4 defines that in the first charging mode M1 or the third charging mode M3, the hydraulic actuators M (travel motors ML, MR, swing motor MT, and hydraulic cylinders C1 to C5) that operate the work device 20 and the traveling device 10 can be operated (driven) ("◯"). The setting information D4 also defines that in the second charging mode M2, the travel actuators (travel motors ML, MR) can be operated (driven) ("◯"), but the swing motor MT and the hydraulic cylinders C1 to C5 cannot be operated ("×").

[0105] For example, when unloading valves 31 are provided corresponding to the operating valves PV1 to PV6 (FIG. 2), the rotation speed control unit 50d controls the unloading valves 31 to switch between the suppression position and the supply position based on the setting information D4, thereby restricting the operation of the hydraulic actuator M. In the first charging mode M1 or the third charging mode M3, the rotation speed control unit 50d controls the unloading valves 31 to the supply position.

[0106] In addition, in the second charging mode M2, the rotation speed control unit 50d controls the unload valves 31 for the operating valves PV1 to PV6 that operate the swing motor MT and hydraulic cylinders C1 to C5 to the suppression position, while the rotation speed control unit 50d controls the unload valves 31 for the operating valves PV1 to PV6 that operate the travel motors ML and MR to the supply position.

[0107] For example, if the control valves PV1 to PV6 are solenoid valves that operate based on control signals sent from the control device 50, the rotation speed control unit 50d may send control signals to the control valves PV1 to PV6 based on setting information D4. In the first charging mode M1 or the third charging mode M3, the rotation speed control unit 50d sends control signals to the control valves PV1 to PV6 based on detection signals indicating the amount of operation and the direction of operation of the input device 5 that are transmitted by a group of sensors included in the input device 5.

[0108] Furthermore, in second charging mode M2, even if the rotation speed control unit 50d receives an operation input to operate the swing motor MT or the hydraulic cylinders C1 to C5, it ignores the detection signal transmitted from the input device 5 and transmits a control signal to the operation valves PV1 to PV6, assuming that the operation amount is zero and the operation direction is neutral. Based on the control signal from the rotation speed control unit 50d, the operation valves PV1 to PV6 change their opening degrees so that the operation amount is zero and the operation direction is neutral. This stops the supply of hydraulic oil to the hydraulic cylinders C1 to C5 and the swing motor MT. Meanwhile, when the rotation speed control unit 50d receives an operation input to operate the traveling device 10 (travel motors ML, MR), it transmits the detection signal (operation amount, detected direction) transmitted from the input device 5 as a control signal to the operation valves PV1 to PV6.

[0109] In the example described above, the rotation speed control unit 50d does not operate the hydraulic actuator M in the second charging mode M2, thereby restricting the operation of the working device 20 compared to the first charging mode M1, but it is sufficient if the rotation speed control unit 50d at least restricts the operation of the working device 20 compared to the first charging mode M1. For example, in the second charging mode M2, the rotation speed control unit 50d may control the unload valve 31 and the operating valves PV1 to PV6, which are solenoid valves, to limit the maximum flow rate of hydraulic oil supplied to the hydraulic actuator M or limit the flow rate of hydraulic oil in response to the amount of operation of the input device 5 by the operator.

[0110] As described above, in the first charging mode M1, the rotation speed control unit 50d can operate the traveling device 10 and the working device 20 according to the operation input by the operator. In the second charging mode M2, the rotation speed control unit 50d sets the working device 20 in a state in which it is not operated by the power of the electric actuator 40. This makes it possible to move (travel) the electric working machine 1 to a storage location while suppressing a decrease in the charge capacity of the battery 41 caused by operating the working device 20.

[0111] The control device 50 may determine a recommended charging mode based on operation information of the battery 41 and / or the working device 20, and display the determination result on the display device 53. As described above, the memory unit 50b stores battery operation information indicating the history of the remaining capacity 71 of the battery 41 and working device operation information indicating the history of the rotation speed R of the electric actuator 40. Based on the working device operation information, the control device 50 determines whether the electric working machine 1 has not been operated for a long period of time (the electric actuator 40 has not been rotated), and determines whether the second charging mode M2, which is intended for storage, is recommended. The control device 50 also estimates from the battery operation information whether the electric working machine 1 will continue to perform work requiring a large amount of power, and determines whether the third charging mode M3, which charges the battery to a full charge, or the first charging mode M1, which charges the battery to a lower level than a full charge, is recommended.

[0112] 10 is a flowchart of the process for determining the recommended charging mode. As shown in Fig. 10, the control device 50 refers to the working device operation information in the storage unit 50b and determines whether there is a history of the electric actuator 40 being operated (whether there is a history of the rotation speed R) within a predetermined period of time in the past (for example, one month) (S1).

[0113] When the control device 50 determines that there is no history of operating the electric actuator 40 in the predetermined section in the past (S1: No), it determines that the second charging mode M2 ​​is recommended (S2).

[0114] When the control device 50 determines that there is a history of operating the electric actuator 40 in a specified section in the past (S1: Yes), it refers to the battery operation information in the memory unit 50b, extracts the number of times that the remaining capacity 71 of the battery 41 fell below a specified value (e.g., 40%) in the specified section in the past, and determines whether the extracted number of times is greater than the specified number of times (S3).

[0115] If the number of times that the remaining capacity 71 of the battery 41 falls below the predetermined value is small, it can be inferred that the electric operating machine 1 has not frequently performed work requiring large amounts of power in the past and will not require a large charge capacity when performing work in the future. Therefore, if the control device 50 determines that the extracted number of times is smaller than the predetermined number (S3: No), it determines that the first charge mode M1 is recommended (S4).

[0116] If the remaining capacity 71 of the battery 41 falls below the predetermined value many times, it can be inferred that the electric operating machine 1 has frequently performed tasks requiring large amounts of power in the past and will likely require a large charge capacity for future tasks. Therefore, if the control device 50 determines that the extracted number of times is greater than the predetermined number (S3: Yes), it determines that the third charge mode M3, which charges the battery until it is fully charged, is recommended (S5).

[0117] Fig. 11 is a diagram showing another example of the setting screen G1. When the control device 50 causes the display device 53 to display the setting screen G1, it performs the above-described process of determining the recommended charging mode. As shown in Fig. 11, the control device 50 causes the setting screen G1 to display a message mg1 indicating the determination result. The message mg1 indicates that the second charging mode M2 ​​("Battery Care") is the recommended charging mode.

[0118] As shown in FIG. 3 , the control device 50 includes an adjustment control unit 50e. The adjustment control unit 50e is a control program pre-stored in the memory unit 50b. For example, when an operator switches the charging mode, the current remaining capacity 71 of the battery 41 may be higher than the reference value used when switching. Therefore, the adjustment control unit 50e performs adjustment control to discharge power from the battery 41 based on the reference value (target value) of the charging mode and the remaining capacity 71 of the battery 41. When the storage charging mode M2 ​​is selected and the current remaining capacity 71 of the battery 41 is equal to or greater than a second reference value, the adjustment control unit 50e (control device 50) performs adjustment control to supply power from the battery 41 to the device Z and discharge the battery 41 to the second reference value.

[0119] As described above, the control device 50 can change the second reference value for the storage charging mode M2 ​​through an operator's input. The adjustment control unit 50e (control device 50) performs adjustment control when the current remaining capacity 71 of the battery 41 is greater than the changed second reference value. On the other hand, the adjustment control unit 50e (control device 50) does not perform adjustment control when the current remaining capacity 71 of the battery 41 is equal to or less than the changed second reference value.

[0120] 12A is a flowchart showing an example of adjustment control. As shown in FIG. 12A , the control device 50 accepts an operation input to switch to the storage charging mode M2 ​​and changes the reference value of the charge capacity of the battery 41 to a second reference value (S10A). In step S10A, when the storage charging mode M2 ​​is selected, the control device 50 may accept an operation by an operator to change the second reference value and change the reference value (second reference value) of the charge capacity of the battery 41.

[0121] The control device 50 acquires the current remaining capacity 71 of the battery 41 from the capacity detection unit 41b (S11). The control device 50 (adjustment control unit 50e) compares the current remaining capacity 71 of the battery 41 with a second reference value (S12).

[0122] When the adjustment control unit 50e determines that the current remaining capacity 71 of the battery 41 is greater than the second reference value (S12: Yes), it causes the alarm device 54 to notify whether or not adjustment control should be performed, and waits for the operator to give an instruction to perform adjustment control (S13).

[0123] For example, the adjustment control unit 50e displays a message mg2 indicating whether or not to perform adjustment control on the notification device 54 (display device 53) ( FIG. 13A ). For example, the message mg2 includes a button b4 for instructing to perform adjustment control and a button b5 for instructing not to perform adjustment control.

[0124] When the worker selects button b5 by performing a predetermined operation on the input device 5 (S13: No), the adjustment control unit 50e ends the process without executing adjustment control. When the worker selects button b4 by performing a predetermined operation on the input device 5, the adjustment control unit 50e determines that an instruction to execute adjustment control has been received (S13: Yes). The adjustment control unit 50e executes adjustment control to discharge power from the battery 41 to the device Z and adjust the charge capacity of the battery 41 (S14). When the adjustment control unit 50e determines that the current remaining capacity 71 of the battery 41 is smaller than the reference value (S12: No), the process ends.

[0125] In addition, when the control device 50 (adjustment control unit 50e) charges the battery 41 to the second reference value using the charging control unit 50c, if the second reference value is changed to a smaller value, the control device 50 (adjustment control unit 50e) may discharge the battery 41 to the changed second reference value.

[0126] FIG. 12B is a flowchart illustrating another example of adjustment control. For example, when the control device 50 receives an input to change the second reference value for the storage charging mode M2 ​​and changes the second reference value (S10B), the control device 50 (adjustment control unit 50e) compares the changed second reference value with the previous second reference value (S15). If the adjustment control unit 50e determines that the changed second reference value is smaller than the previous second reference value (S15: Yes), it causes the notification device 54 to notify the operator whether or not to perform adjustment control and waits for the operator to issue an instruction to perform adjustment control (S13). If the adjustment control unit 50e receives an instruction to perform adjustment control from the operator (S13: Yes), it executes adjustment control (S14). If the adjustment control unit 50e determines that the changed reference value is larger than the previous reference value (S15: No), it terminates the process.

[0127] Next, the adjustment control (step S14) performed by the adjustment control unit 50e will be described in detail.

[0128] In adjustment control (step S14), the control device 50 (adjustment control unit 50e) supplies power from the connection unit 48 to the power storage device Y. Specifically, when the starter switch 5d is turned OFF by the operator, the adjustment control unit 50e performs adjustment control (step S14) by closing the relay of the connection unit 48 and transmitting an instruction signal to the junction box 43 to set the power supply source to the battery 41 and the power supply destination to the low-voltage battery 45. This makes it possible to discharge (store) surplus power from the battery 41 to the power storage device Y when the accessory power supply is OFF.

[0129] The adjustment control unit 50e adjusts the remaining capacity 71 of the battery 41 by discharging (storing) the excess power of the battery 41 in the power storage device Y, but instead of or in addition to this, the remaining capacity 71 of the battery 41 may be adjusted by consuming the excess power of the battery 41 by driving another device Z provided in the electric work machine 1.

[0130] For example, when an operator selects the storage charge mode M2, which assumes storage, it is assumed that the electric work machine 1 is in a closed space such as a barn or warehouse for storage. Therefore, if the electric work machine 1 were to physically operate to adjust the remaining capacity 71 of the battery 41 (consuming power), this could cause problems. Therefore, the control device 50 (adjustment control unit 50e) restricts the operation of the traveling device 10 and the working device 20 and performs adjustment control (step S14). When performing adjustment control (step S14), the control device 50 (adjustment control unit 50e) stops the operation of the traveling device 10 and the working device 20 in response to an operation input from the input device 5. The adjustment control unit 50e controls the unload valve 31 ( FIGS. 2 and 3 ) to switch to the suppression position, thereby restricting the operation of the hydraulic actuator M and thereby stopping the operation of the traveling device 10 and the working device 20. As a result, the adjustment control unit 50e can drive the electric actuator 40 while the operation of the hydraulic actuator M is stopped, thereby consuming excess power from the battery 41.

[0131] In addition, if the operating valves PV1 to PV6 are solenoid valves that operate based on control signals sent from the control device 50, the adjustment control unit 50e may ignore the detection signals of the operating amount and operating direction of the operating lever 5a sent by the group of sensors possessed by the operating lever 5a (input device 5), and may determine that the operating amount is zero and the operating direction is neutral, and send control signals to the operating valves PV1 to PV6 to stop the operation of the traveling device 10 and the working device 20.

[0132] In the adjustment control (step S14), the control device 50 (adjustment control unit 50e) controls the rotation speed R of the electric motor (electric actuator 40) to a high idle rotation speed Rh. The high idle rotation speed Rh is the maximum value of the rotation speed R that can be set for the electric actuator 40. In this embodiment, the high idle rotation speed Rh is the set value Rmax. This allows the adjustment control unit 50e to drive the electric actuator 40 at the maximum rotation speed R, thereby enabling a relatively large amount of power to be discharged from the battery 41 and shortening the time required to perform the adjustment control (step S14).

[0133] The control device 50 (adjustment control unit 50e) may operate the heating and cooling device 51, which is device Z, in the adjustment control (step S14). Furthermore, it is expected that after selecting the storage charging mode M2 ​​intended for storage, the operator will leave the driver's seat 3 (FIG. 1) and exit the protection mechanism 4. For this reason, the control device 50 (adjustment control unit 50e) may simultaneously operate the cooling function (air conditioner) and the heating function (electric heater) of the heating and cooling device 51 in the adjustment control (step S14). This allows the adjustment control unit 50e to efficiently adjust (consume) surplus power from the battery 41.

[0134] The control device 50 (adjustment control unit 50e) may cause the alarm device 54 to notify that the adjustment control (step S14) is being executed. For example, the alarm device 54 (speaker) issues audio information based on an instruction signal from the adjustment control unit 50e. The audio information includes a beep, a spoken voice (for example, "Adjustment control is being executed"), etc. Furthermore, the alarm device 54 (light) turns on based on an instruction signal from the adjustment control unit 50e. This allows a worker outside the protection mechanism 4 of the electric work machine 1 to know that the adjustment control (step S14) is being executed.

[0135] The control device 50 (adjustment control unit 50e) may also calculate an estimated end time for the adjustment control (step S14) to end and cause the notification device 54 to notify the estimated end time. The memory unit 50b stores a program (end time prediction program) for calculating the estimated end time. The end time prediction program uses the current remaining capacity 71 of the battery 41, the amount of discharged power per unit time discharged from the battery 41 during adjustment control, and a reference value as input parameters, and calculates (outputs) an estimated end time (required time) required for discharging the remaining capacity 71 of the battery 41 to the reference value. The adjustment control unit 50e inputs the parameters into the end time prediction program and executes the end time prediction program to obtain the estimated end time. The adjustment control unit 50e transmits an instruction signal including the estimated end time to the notification device 54. The notification device 54 notifies the estimated end time based on the instruction signal from the adjustment control unit 50e. For example, when the notification device 54 is a display device 53 that is a display terminal, the notification device 54 displays graphical information of the predicted completion time based on an instruction signal from the adjustment control unit 50e. Fig. 13B is a diagram showing an example of information notified by the notification device 54. As shown in Fig. 13B, the adjustment control unit 50e causes the notification device 54 (display device 53) to display a message mg3 indicating the predicted completion time. The message mg3 indicates that the predicted completion time is approximately 30 minutes.

[0136] In the above embodiment, the input device 5 that receives operation inputs for the traveling device 10 and the working device 20 is described as being provided inside the protection mechanism 4, but the input device 5 may also be a terminal device that allows the worker to remotely operate the electric work machine 1. In this case, the control device 50 includes a communication unit that can communicate with the terminal device. When the worker operates the input device 5, the input device 5 (terminal device) transmits an operation instruction signal to the communication unit of the control device 50. The control device 50 controls each device provided in the electric work machine 1 based on the operation instruction signal received via the communication unit.

[0137] <Modification 1> The control device 50 may be configured to switch between two charging modes: a charging mode in which charging is performed until the battery is fully charged, and a charging mode in which charging is performed until the battery reaches the charge capacity at the time of storage. FIG. 14A is a diagram showing an example of setting information D1 in which a target value (reference value) of the charge capacity is defined in Modification 1. As shown in FIG. 14A, in the setting information D1, the first target value in the first charging mode M1 is set to 100%, which corresponds to a full charge. Furthermore, the second target value in the second charging mode M2 ​​is set to 40%. The second target value is a value that makes it difficult for the battery 41 to fully discharge due to natural discharge, even if the battery 41 is not charged for a relatively long period of time. The control device 50 switches the target value of the charge capacity by referring to the setting information D1.

[0138] 14B , in the first charging mode M1, the control device 50 refers to the setting information D2 and converts the numerical image 71a indicating the current remaining capacity 71 of the battery 41 to blue, and causes the display device 53 to display it. Furthermore, the control device 50 displays ten figures Sa based on the number of gauges in the setting information D2. In the second charging mode M2, the control device 50 refers to the setting information D2 and converts the numerical image 71a indicating the current remaining capacity 71 of the battery 41 to red, and causes the display device 53 to display it. Furthermore, the control device 50 displays four figures Sa based on the number of gauges in the setting information D2.

[0139] As shown in FIG. 14C, in the first charging mode M1, the rotation speed control unit 50d (control device 50) refers to the setting information D3 and sets the setting values ​​Rmax, Rth, and Rmin corresponding to the received operation input as the upper limit rotation speed Rlim ("O").

[0140] In the second charging mode M2, when the rotation speed control unit 50d receives operation of the operation switch 5c3 ("eco mode"), it sets the upper limit rotation speed Rlim to the set value Rmin corresponding to the received operation input ("◯"). On the other hand, even when the operation switch 5c1 ("power mode") or the operation switch 5c2 ("normal mode") is operated, the rotation speed control unit 50d does not change the upper limit rotation speed Rlim to the set values ​​Rmax and Rth corresponding to the operation switch 5c1, 5c2 ("x"). The rotation speed control unit 50d sets the upper limit rotation speed Rlim to a predetermined value R1. The predetermined value R1 is, for example, Rmin, which is the upper limit of the range of the rotation speed R in the second charging mode M2.

[0141] 14D is a diagram showing an example of setting information D4 in which the hydraulic actuators M that can be driven for each charging mode are defined in Modification 1. As shown in FIG. 14D , the setting information D4 defines that in the first charging mode M1, the hydraulic actuators M (travel motors ML, MR, swing motor MT, and hydraulic cylinders C1-C5) corresponding to the operation of the travel device 10 and the work device 20 can be driven ("◯"). On the other hand, the setting information D4 defines that in the second charging mode M2, the drive of the hydraulic cylinders C1-C5 and swing motor MT corresponding to the operation of the work device 20 is limited compared to the first charging mode M1 ("X"). The setting information D4 also defines that in the second charging mode M2, the travel motors ML, MR corresponding to the operation of the travel device 10 can be driven ("◯").

[0142] <Modification 2> The control device 50 may be configured to switch between two charging modes: a charging mode in which the battery 41 is charged to a charge capacity that is less likely to deteriorate than a fully charged state, and a charging mode in which the battery 41 is charged to a charge capacity at the time of storage. FIG. 15A is a diagram showing an example of setting information D1 in which a target value (reference value) of the charge capacity is defined according to Modification 2. As shown in FIG. 15A, in setting information D1, the first target value in the first charging mode M1 is set to 80%. The first target value is a charge capacity for performing work using the working device 20, and is set to a value that is less likely to deteriorate than a fully charged state. Furthermore, the second target value in the second charging mode M2 ​​is set to 40%.

[0143] 15B , in the first charging mode M1, the control device 50 refers to the setting information D2, converts the numeric image 71a indicating the current remaining capacity 71 of the battery 41 to yellow, and causes the display device 53 to display it. Furthermore, the control device 50 displays eight figures Sa based on the number of gauges in the setting information D2. In the second charging mode M2, the control device 50 refers to the setting information D2, converts the numeric image 71a indicating the current remaining capacity 71 of the battery 41 to red, and causes the display device 53 to display it. Furthermore, the control device 50 displays four figures Sa based on the number of gauges in the setting information D2.

[0144] 15C , in first charge mode M1, rotation speed control unit 50d sets set values ​​Rth and Rmin corresponding to operation switch 5c2 ("normal mode") and operation switch 5c3 ("eco mode") as the upper limit rotation speed Rlim ("◯"). On the other hand, when rotation speed control unit 50d receives an operation input from operation switch 5c1 ("power mode"), it sets set value Rmax corresponding to operation switch 5c1 as the upper limit rotation speed Rlim, and when a predetermined time t1 has elapsed since receiving the input operation from operation switch 5c1, it changes the upper limit rotation speed Rlim to or below set value Rth, which is the next lower rotation speed ("△").

[0145] In the second charging mode M2, when the rotation speed control unit 50d receives operation of the operation switch 5c3 ("eco mode"), it sets the upper limit rotation speed Rlim to the set value Rmin corresponding to the received operation input ("◯"). On the other hand, even when the operation switch 5c1 ("power mode") or the operation switch 5c2 ("normal mode") is operated, the rotation speed control unit 50d does not change the upper limit rotation speed Rlim to the set values ​​Rmax and Rth corresponding to the operation switch 5c1, 5c2 ("x"). The rotation speed control unit 50d sets the upper limit rotation speed Rlim to a predetermined value R1. The predetermined value R1 is, for example, Rmin, which is the upper limit of the range of the rotation speed R in the second charging mode M2.

[0146] 15D, the setting information D4 defines that in the first charging mode M1, the hydraulic actuators M (travel motors ML, MR, swing motor MT, and hydraulic cylinders C1-C5) corresponding to the operation of the travel device 10 and the work device 20 can be driven ("◯"). On the other hand, the setting information D4 defines that in the second charging mode M2, the drive of the hydraulic cylinders C1-C5 and swing motor MT corresponding to the operation of the work device 20 is limited compared to the first charging mode M1 ("X"). The setting information D4 also defines that in the second charging mode M2, the travel motors ML, MR corresponding to the operation of the travel device 10 can be driven ("◯").

[0147] A preferred embodiment of the present invention provides an electric operating machine 1 described in the following items.

[0148] (Item A1) An electric work machine 1 comprising a chargeable and dischargeable battery 41, an electric actuator 40 that generates power using electricity discharged from the battery 41, a work device 20 that operates using the power generated by the electric actuator 40, and a control device 50 that can control the charging of the battery 41, wherein the control device 50 is switchable between a first charging mode M1 in which the battery is charged up to a first target value that is a charge capacity for performing work using the work device 20, and a second charging mode M2 ​​in which the battery is charged up to a second target value that is lower than the first target value and is a charge capacity during storage.

[0149] According to the electric operating machine 1 according to item A1, the battery 41 can be appropriately charged during operation and storage. In the second charging mode M2, by setting the charge capacity (second target value) to be less than the charge capacity for operation (first target value), deterioration of the battery 41 can be suppressed more than when the battery 41 is stored in a state charged to the first target value. Furthermore, in the first charging mode M1, by setting the charge capacity (first target value) to be greater than the charge capacity for storage (second target value), the operable time of the electric operating machine 1 can be extended, improving workability.

[0150] (Item A2) The electric operating machine 1 according to Item A1, wherein the first target value is set to a charge capacity that is less than a full charge.

[0151] According to the electric work machine 1 relating to item A2, it is possible to prevent deterioration of the battery 41 that occurs when the remaining capacity 71 of the battery 41 is fully charged, while also operating the work device 20 to perform work.

[0152] (Item A3) The electric work machine 1 described in item A1 or A2, wherein the control device 50 is capable of switching to a third charging mode M3 in which charging is performed until the battery is fully charged, separate from the first charging mode M1 and the second charging mode M2.

[0153] According to the electric work machine 1 according to item A3, the third charging mode M3 can store more power in the battery 41 than the first charging mode M1 and the second charging mode M2. Therefore, by selecting and charging the third charging mode M3, the electric work machine 1 can operate for a longer period of time than the first charging mode M1 and the second charging mode M2.

[0154] (Item A4) The electric operating machine 1 according to any one of items A1 to A3, wherein the control device 50 controls the electric actuator 40 under different control conditions for each charging mode.

[0155] According to the electric operating machine 1 according to item A4, the control device 50 can control the electric actuator 40 according to the set charging mode.

[0156] (Item A5) The electric work machine 1 according to item A4, wherein the control device 50 limits the output of the electric actuator 40 when in the second charging mode M2 ​​compared to when in the first charging mode M1.

[0157] According to the electric work machine 1 according to item A5, in the second charging mode M2, the output of the electric actuator 40 is limited, thereby reducing the amount of power consumed by the electric actuator 40 compared to the first charging mode M1. This allows the control device 50 to reduce the decrease in the charge capacity of the battery 41 due to the driving of the electric actuator 40 in the second charging mode M2.

[0158] (Item A6) The electric actuator 40 is an electric motor, and the control device 50 limits the rotation speed R of the electric motor when in the second charging mode M2 ​​compared to when in the first charging mode M1.

[0159] According to the electric work machine 1 according to item A6, the control device 50 can suppress a decrease in the charge capacity of the battery 41 by limiting the rotation speed R of the electric motor in the second charge mode M2.

[0160] (Item A7) The control device 50 is capable of setting an upper limit rotation speed Rlim of the rotation speed R of the electric motor, and when in the second charging mode M2, the maximum value of the settable range of the upper limit rotation speed Rlim is set lower than when in the first charging mode M1. This is the electric work machine 1 described in Item A6.

[0161] According to the electric operating machine 1 according to item A7, the control device 50 can suppress a decrease in the charge capacity of the battery 41 in the second charge mode M2.

[0162] (Item A8) The control device 50 is capable of setting the rotation speed R of the electric motor to exceed the maximum value by performing a predetermined operation, and when the rotation speed R of the electric motor is set to exceed the maximum value, the control device 50 sets the rotation speed R of the electric motor to less than the maximum value after a predetermined time t1 has elapsed or when the predetermined operation is completed. This is the electric work machine 1 described in Item A7.

[0163] According to the electric work machine 1 relating to item A8, the control device 50 can simultaneously suppress the decrease in the charge capacity of the battery 41 and allow a large amount of power to be temporarily discharged from the battery 41 to operate the work device 20 and perform work.

[0164] (Item A9) An electric work machine 1 described in any one of items A6 to A8, comprising hydraulic pumps P1, P2 that discharge hydraulic oil using power generated by the electric motor, and a hydraulic actuator M that is driven by the hydraulic oil discharged by the hydraulic pumps P1, P2 and operates the work device 20.

[0165] According to the electric operating machine 1 according to item A9, it is possible to realize the electric operating machine 1 that exhibits the excellent effects described above.

[0166] (Item A10) The electric working machine 1 described in any one of items A1 to A8, wherein the electric actuator 40 is an electric motor, and comprises hydraulic pumps P1, P2 that discharge hydraulic oil using power generated by the electric motor, a hydraulic actuator M that is driven by the hydraulic oil to operate the working device 20, and a traveling device 10 that is equipped with travel actuators (travel motors ML, MR) driven by the hydraulic oil, and when in the second charging mode M2, the control device 50 limits the operation of the working device 20 compared to when in the first charging mode M1, and maintains the traveling device 10 in a drivable state.

[0167] According to the electric work machine 1 relating to this item A10, in the second charging mode M2, it is possible to suppress a decrease in the charge capacity of the battery 41 due to the operation of the work device 20, while allowing the traveling device 10 to be driven in order to move the electric work machine 1 to a storage location.

[0168] (Item A11) An electric working machine 1 described in any one of items A1 to A10, wherein the amount of electric power charged per unit time to the battery 41 in the second charging mode M2 ​​is greater than the amount of electric power charged in the first charging mode M1.

[0169] The electric work machine 1 according to item A11 allows the operator to efficiently perform charging work. When the amount of charging power per unit time is large, the time required to charge to a predetermined target value is shortened, but as the amount of charging power per unit time increases, the temperature of the battery 41 rises. When the temperature of the battery 41 rises, the amount of power discharged (output) from the battery 41 is limited. However, immediately after charging is completed in the second charging mode M2, a large amount of power is not discharged from the battery 41. In other words, in the second charging mode M2, it is not necessary to consider the workability immediately after charging (the amount of power that can be discharged is limited). As a result, in the second charging mode M2, priority is given to short-term charging, allowing for efficient charging work.

[0170] (Item A12) An electric work machine 1 described in any one of items A1 to A11, which is equipped with an input device 5 that accepts input of a selected charging mode and a display device 53 that can display information about the battery 41, and the control device 50 determines the recommended charging mode based on operation information of the battery 41 and / or the work device 20, and displays the determination result on the display device 53.

[0171] According to the electric operating machine 1 according to item A12, the operator can check the recommended charging mode by looking at the display device 53.

[0172] (Item A13) An electric work machine 1 described in any one of items A1 to A12, which is provided with a display device 53 capable of displaying information about the battery 41, and the control device 50 causes the display device 53 to display the status of the battery 41 in a different display format for each charging mode.

[0173] According to the electric operating machine 1 according to item A13, the operator can check the currently set charging mode by looking at the display device 53.

[0174] (Item A14) The electric operating machine 1 according to any one of items A1 to A13, wherein the battery 41 is a lithium ion battery.

[0175] According to the electric operating machine 1 according to item A14, it is possible to realize the electric operating machine 1 that exhibits the excellent effects described above.

[0176] (Item B1) An electric working machine 1 comprising a rechargeable battery 41, an equipment Z supplied with power from the battery 41, a capacity detection unit 41b that detects the current remaining capacity 71 of the battery 41, and a control device 50 that controls the charging of the battery 41 and the operation of the equipment Z, wherein the control device 50 has normal charging modes (first charging mode or third charging mode) M1, M3 that charge the battery 41 up to a predetermined first reference value, and a storage charging mode (second charging mode) M2 that charges the battery 41 up to a second reference value that is smaller than the first reference value, and when the storage charging mode M2 ​​is selected and the current remaining capacity 71 of the battery 41 is equal to or greater than the second reference value, the electric working machine 1 performs adjustment control to supply power from the battery 41 to the equipment Z and discharge the battery 41 down to the second reference value.

[0177] The electric operating machine 1 according to item B1 can appropriately adjust the remaining capacity 71 of the battery 41. When the storage charging mode M2 ​​is selected, the electric operating machine 1 can easily reduce the remaining capacity 71 of the battery 41 to the second reference value.

[0178] (Item B2) The control device 50 is capable of changing the second reference value, and performs the adjustment control when the current remaining capacity 71 of the battery 41 is greater than the changed second reference value, and does not perform the adjustment control when the current remaining capacity 71 of the battery 41 is equal to or less than the changed second reference value.

[0179] According to the electric operating machine 1 according to item B2, the second reference value, which is the reference value for the storage charging mode M2, can be appropriately changed. Furthermore, the remaining capacity 71 of the battery 41 can be easily adjusted based on the second reference value.

[0180] (Item B3) An electric work machine 1 described in item B1 or B2 is provided with a charger 47 that charges the battery 41, and when the charger 47 charges the battery 41, if the current remaining capacity 71 of the battery 41 is smaller than the changed second reference value, the control device 50 performs charging control to charge the battery 41 to the second reference value.

[0181] According to the electric operating machine 1 according to item B3, the battery 41 can be charged appropriately.

[0182] (Item B4) The electric work machine 1 described in Item B3, wherein when the control device 50 charges the battery 41 to the second reference value through the charging control and then changes the second reference value to be smaller, discharges the battery 41 to the changed second reference value through the adjustment control.

[0183] According to the electric work machine 1 relating to item B4, the remaining capacity 71 of the battery 41 can be easily adjusted even if the second reference value is changed after charging based on the second reference value.

[0184] (Item B5) The device Z includes a connection unit 48 that can be connected to an external power storage device Y, and the control device 50 supplies power from the connection unit 48 to the power storage device Y during the adjustment control. This is an electric work machine 1 described in any one of items B1 to B4.

[0185] According to the electric operating machine 1 according to item B5, by supplying surplus power to the power storage device Y, the remaining capacity 71 of the battery 41 can be appropriately adjusted.

[0186] (Item B6) An electric work machine 1 described in any one of items B1 to B5, comprising a body 2 that supports the battery 41 and / or the equipment Z, a traveling device 10 that supports the body 2 so that it can travel, and a working device 20 provided on the body 2, wherein the control device 50 limits the operation of the traveling device 10 and the working device 20 when performing the adjustment control.

[0187] According to the electric working machine 1 according to item B6, it is possible to prevent problems caused by the physical movement of the traveling device 10 and the working device 20 during adjustment control.

[0188] (Item B7) An electric work machine 1 as described in Item B6, which is provided with an input device 5 that accepts operation inputs for the traveling device 10 and the working device 20, and the control device 50 is capable of controlling the operation of the traveling device 10 and the working device 20 by the operation input from the input device 5, and when performing the adjustment control, stops the operation of the traveling device 10 and the working device 20 by the operation input from the input device 5.

[0189] According to the electric work machine 1 according to item B7, the traveling device 10 and the working device 20 do not operate even if an operator performs an operation input, thereby preventing problems that may occur due to the physical movement of the traveling device 10 and the working device 20. In addition, the operator can know that the electric work machine 1 is under adjustment control.

[0190] (Item B8) An electric work machine 1 described in any one of items B1 to B7, comprising hydraulic pumps P1, P2 that discharge hydraulic oil, and a hydraulic actuator M that is driven by the hydraulic oil discharged by the hydraulic pumps P1, P2 to operate the traveling device 10 and / or the work device 20, and the device Z includes an electric motor that supplies power to the hydraulic pumps P1, P2.

[0191] According to the electric operating machine 1 according to item B8, it is possible to realize the electric operating machine 1 that exhibits the excellent effects described above.

[0192] (Item B9) The electric working machine 1 according to item B8, wherein the control device 50 controls the rotation speed R of the electric motor to a high idle rotation speed Rh in the adjustment control.

[0193] According to the electric work machine 1 of item B9, by rotating the electric motor at the high idle rotation speed Rh, the amount of power consumed is greater than when the electric motor is rotated at a rotation speed lower than the high idle rotation speed Rh, such as a normal idle rotation speed, etc. Therefore, the remaining capacity 71 of the battery 41 can be efficiently adjusted (reduced) to the reference value.

[0194] (Item B10) The equipment Z includes a heating and cooling equipment 51, and the control device 50 operates the heating and cooling equipment 51 in the adjustment control, according to any one of items B1 to B9.

[0195] According to the electric operating machine 1 according to item B10, the remaining capacity 71 of the battery 41 can be appropriately adjusted by operating the air conditioning device 51 using surplus electric power.

[0196] (Item B11) The electric operating machine 1 according to item B10, wherein the control device 50 simultaneously operates the cooling function and the heating function of the air conditioning device 51 as the adjustment control.

[0197] In the electric operating machine 1 according to item B11, the amount of power consumed increases when the cooling function and the heating function are operated simultaneously, so the remaining capacity 71 of the battery 41 can be efficiently adjusted (reduced) to the reference value.

[0198] (Item B12) The electric operating machine 1 according to any one of items B1 to B11, further comprising an alarm device 54 that notifies that the adjustment control is being executed.

[0199] According to the electric operating machine 1 according to item B12, the operator can know whether or not adjustment control is being performed.

[0200] (Item B13) The control device 50 calculates an expected end time for the adjustment control to end, and causes the notification device 54 to notify the expected end time, in the electric operating machine 1 described in any one of items B1 to B12.

[0201] According to the electric operating machine 1 according to item B13, the operator can grasp the completion time (required time) of the adjustment work.

[0202] (Item B14) The electric operating machine 1 according to any one of items B1 to B13, wherein the battery 41 is a lithium ion battery.

[0203] According to the electric operating machine 1 according to item B14, it is possible to realize the electric operating machine 1 that exhibits the excellent effects described above.

[0204] 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.

[0205] 1: Electric work machine 5: Input device 20: Work device 40: Electric actuator 41: Battery 50: Control device 53: Display device M: Hydraulic actuator ML, MR: Travel actuator (travel motor) M1: First charge mode M2: Second charge mode M3: Third charge mode P1, P2: Hydraulic pump R: Rotation speed Rlim: Upper limit of rotation speed t1: Predetermined time

Claims

1. An electric work machine comprising: a rechargeable battery; an electric actuator that generates power using electricity discharged from the battery; a work device that operates using the power generated by the electric actuator; and a control device that can control the charging of the battery, wherein the control device is switchable between a first charging mode in which the battery is charged up to a first target value that is the charge capacity for performing work using the work device, and a second charging mode in which the battery is charged up to a second target value that is lower than the first target value and is the charge capacity during storage.

2. The electric operating machine according to claim 1, wherein the first target value is set to a charge capacity that is less than a full charge.

3. An electric operating machine according to claim 2, wherein the control device is capable of switching to a third charging mode, separate from the first charging mode and the second charging mode, in which charging is continued until the battery is fully charged.

4. The electric operating machine according to claim 1, wherein the control device controls the electric actuator under different control conditions for each charging mode.

5. The electric operating machine according to claim 4, wherein the control device limits the output of the electric actuator when in the second charging mode compared to when in the first charging mode.

6. An electric working machine as described in claim 5, wherein the electric actuator is an electric motor, and the control device limits the rotation speed of the electric motor when in the second charging mode compared to when in the first charging mode.

7. An electric work machine as described in claim 6, wherein the control device is capable of setting an upper limit rotation speed of the electric motor, and when in the second charging mode, the maximum value of the settable range of the upper limit rotation speed is set lower than when in the first charging mode.

8. An electric work machine as described in claim 7, wherein the control device is capable of setting the rotation speed of the electric motor to exceed the maximum value by performing a predetermined operation, and when the rotation speed of the electric motor is set to exceed the maximum value, the control device sets the rotation speed of the electric motor to less than or equal to the maximum value after a predetermined time has elapsed or when the predetermined operation is completed.

9. An electric work machine according to claim 6, comprising: a hydraulic pump that discharges hydraulic oil using power generated by the electric motor; and a hydraulic actuator that is driven by the hydraulic oil discharged by the hydraulic pump and operates the work device.

10. An electric work machine as described in claim 1, wherein the electric actuator is an electric motor, and the electric work machine comprises: a hydraulic pump that discharges hydraulic oil using power generated by the electric motor; a hydraulic actuator that is driven by the hydraulic oil to operate the work device; and a traveling device that has a traveling actuator driven by the hydraulic oil, and the control device, when in the second charging mode, limits the operation of the work device compared to when in the first charging mode, and maintains the traveling device in a drivable state.

11. The electric operating machine according to claim 1, wherein the amount of electric power charged to the battery per unit time in the second charging mode is greater than the amount of electric power charged in the first charging mode.

12. An electric work machine as described in claim 1, comprising: an input device that accepts input of a selected charging mode; and a display device that can display information about the battery, wherein the control device determines the recommended charging mode based on operating information about the battery and / or the work machine, and displays the determination result on the display device.

13. An electric operating machine according to claim 1, further comprising a display device capable of displaying information relating to the battery, wherein the control device causes the display device to display the state of the battery in a different display format for each charging mode.

14. An electric work machine according to any one of claims 1 to 13, wherein the battery is a lithium ion battery.

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