Electric work machine and charging system for electric work machine

Abstract

The present invention reduces influence on post-charging work in an electric work machine (1).　The electric work machine (1) comprises an electric motor (9), a battery unit (30) having a battery (31) that supplies power to the electric motor (9), a work device (20) that operates using the driving force of the electric motor (9), a charging port (41) connected to an external fast charger (200) via a charging cable (201), an operation unit (5c) that sets a charging parameter, and a control device (7) that changes a current value supplied from the fast charger (200) to the battery unit (30) with the charging parameter set by the operation unit (5c).

Description

[Technical field]

[0001] The present invention relates to an electric working machine that runs on battery power and a charging system for the electric working machine. [Background technology]

[0002] Patent Document 1 discloses an electric work machine (e.g., a hydraulic excavator) that is driven by power supplied from a rechargeable battery. In such an electric work machine, when the remaining battery power becomes low, a quick charger installed externally is used to perform quick charging. [Prior art documents] [Patent documents]

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

[0004] During quick charging, a large current (for example, up to about 125 amperes) flows from the quick charger to the battery of the electric work machine, allowing the battery to be fully charged in a short time, for example, about one hour. For this reason, it is possible to fully charge the battery just by quick charging during a lunch break, for example, but there is a concern that the battery temperature may rise due to the large current. When the battery is fully charged, if the battery reaches a preset usage limit temperature, the output of the electric motor may be adjusted to suppress the battery temperature rise. This is because if the battery is used at or above the usage limit temperature, the battery's service life cannot be secured. For this reason, even in cases where charging in a short time is not necessary, quick charging may cause problems in work after charging.

[0005] The present invention has been made to solve such problems in the conventional technology, and has an object to reduce the hindrance to work after charging in an electric working machine. [Means for solving the problem]

[0006] An electric operating machine according to one aspect of the present invention includes: Electric motor And the above Electric motor a battery unit having a battery for supplying power to the Electric motor a connection unit that is connected to an external quick charger via a charging cable; an operation unit that sets charging parameters; and a control device that changes a value of a current supplied from the quick charger to the battery unit according to the charging parameters set by the operation unit. a hydraulic pump driven by the electric motor to discharge hydraulic oil; a hydraulic device driven by the hydraulic oil from the hydraulic pump; and a working device operated by the hydraulic device; Equipped with The operation unit is used to set the motor rotation speed of the electric motor during normal charging, and is used to set the charging parameters during charging other than normal charging. .

[0007] The operation unit may set the charging parameters to be used to instruct the rapid charger, and the control device may output the charging parameters set by the operation unit to the rapid charger. The battery unit may also be provided with a display device, the battery unit may be provided with a battery monitoring device that monitors the state of the battery, the battery monitoring device may determine an acceptable range of the charging parameters based on the state of the battery, the control device may cause the display device to display the acceptable range determined by the battery monitoring device, and the operation unit may be capable of setting the charging parameters within the acceptable range.

[0008] In addition, an electric work machine according to one embodiment of the present invention may be equipped with a display device, the battery unit may be equipped with a battery monitoring device that monitors the state of the battery, the battery monitoring device may detect at least the temperature of the battery as the state of the battery, the control device may display the charging parameters set by the operation unit and the temperature of the battery detected by the battery monitoring device on the display device, and the operation unit may be capable of changing the settings of the charging parameters.

[0009] In addition, when the temperature value of the battery detected by the battery monitoring device becomes equal to or higher than a set temperature that is set lower than the battery's usage limit temperature, the control device may change the charging parameters set in the operation unit to charging parameters for making the temperature of the battery lower than the set temperature. In addition, the battery monitoring device may calculate a predicted charging time, which is the time required to charge the battery to the target charging amount, using the target charging amount of the battery, the remaining capacity of the battery, the charging parameters set by the operation unit, and the charging capacity per unit time, and the control device may display the predicted charging time on the display device.

[0010] The battery unit may also be equipped with a battery monitoring device that monitors the state of the battery, and the battery monitoring device may determine whether or not charging of the battery needs to be stopped based on at least one of the battery's temperature, current, voltage, remaining capacity, and charging time, and the control device may output a charging stop request to the rapid charger when the battery monitoring device determines that charging needs to be stopped.

[0012] In addition, the control device may be configured to accept, when the charging cable is connected to the connection portion, an operation on the operating unit as an operation for setting the charging parameters, and, when the charging cable is disconnected from the connection portion, to accept an operation on the operating unit as an operation for setting the motor rotation speed of the electric motor. The control device controls the battery to supply current to the battery unit from the quick charger. Electric motor Alternatively, the power supply to the

[0013] Also, An electric operating machine according to one aspect of the present invention includes: Electric motor and , a battery unit having a battery for supplying power to the electric motor; a working device that operates using a driving force of the electric motor; a connection unit that is connected to an external quick charger via a charging cable; an operation unit that sets charging parameters; and a control device that changes a value of a current supplied from the quick charger to the battery unit according to the charging parameters set by the operation unit.The quick charger includes a hydraulic pump driven by the electric motor to discharge hydraulic oil, a hydraulic device driven by the hydraulic oil from the hydraulic pump, a working device operated by the hydraulic device, and an unloading valve that can be switched between a supply position where the hydraulic oil from the hydraulic pump is supplied to the hydraulic device and a cut-off position where the hydraulic oil from the hydraulic pump is not supplied to the hydraulic device, and the control device does not supply current from the quick charger to the battery unit when the unloading valve is in the supply position. stomach.

[0014] The charging parameters set by the operation unit may include at least one of a current value, a charging time, a charging amount, and a charging speed. A charging system for an electric work machine according to one embodiment of the present invention includes the electric work machine and a quick charger that changes the current value supplied to the electric work machine via the charging cable in response to an instruction from the electric work machine. Effect of the Invention

[0015] According to the above configuration, the operator can appropriately set charging parameters according to the state and usage pattern of the electric operating machine, thereby reducing the disruption of work after charging the electric operating machine. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is an electrical block diagram of the electric operating machine. [Diagram 2] FIG. 2 is a diagram showing an example of a charging mode in which an electric operating machine and an external charger are connected by a charging cable. [Figure 3A] FIG. 4 is a diagram illustrating an example of an operation switch. [Figure 3B] FIG. 13 is a diagram showing an example of an operation switch of the second modified example. [Figure 4] FIG. 2 is a hydraulic circuit diagram of the electric working machine. [Diagram 5] FIG. 2 is a layout diagram of the inside of the electric work machine. [Figure 6A] FIG. 4 is a diagram showing an example of a display screen of a display device. [Figure 6B] FIG. 4 is a diagram showing an example of a display screen of a display device. [Figure 6C] FIG. 4 is a diagram showing an example of a display screen of a display device. [Figure 6D] FIG. 4 is a diagram showing an example of a display screen of a display device. [Figure 7A] 5 is a flowchart showing an example of a charging start process for an electric operating machine using an external charger. [Figure 7B] 4 is a flowchart showing an example of charging control of an electric operating machine. [Figure 8] FIG. 11 is an electrical block diagram of an electric operating machine according to a third modified example. [Figure 9] FIG. 2 is an overall side view of the electric working machine. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, the overall configuration of the electric operating machine 1 will be described. FIG. 9 is an overall side view of the electric operating machine 1. As shown in FIG. The electric work machine 1 is a backhoe. The electric work machine 1 is equipped with a machine body (swivel base) 2, a traveling device 10, a working device 20, etc. On top of the machine body 2, there are provided a driver's seat 4 where an operator sits, and a protection mechanism 6 that protects the driver's seat 4 from the front, rear, left, right, and above.

[0018] The protection mechanism 6 is also called a cabin. The protection mechanism 6 has a frame attached to the fuselage 2, a roof attached to the top of the frame, and a plurality of side walls attached to the front, rear, left and right sides of the frame (details not shown). Each side wall is provided with a transparent portion (so-called a window) through which the surroundings can be viewed from the driver's seat 4. Such a protection mechanism 6 separates the space around the driver's seat 4 from the outside. In other words, the protection mechanism 6 forms a driver's cab 4R in which the driver's seat 4 is located.

[0019] An operating device 5 for operating the electric work machine 1 is provided around the driver's seat 4 inside the protection mechanism 6 (driver's cab 4R). The operator can operate the operating device 5 while seated in the driver's seat 4. In this embodiment, the direction in which an operator seated in the driver's seat 4 faces (the direction of arrow A1 in FIG. 9) is referred to as the forward direction, and the opposite direction (the direction of arrow A2 in FIG. 9) is referred to as the rearward direction. Furthermore, when an operator seated in the driver's seat 4 faces forward A1, the left side is referred to as the left side, and the right side of the operator is referred to as the right side. In addition, the horizontal direction perpendicular to the fore-and-aft direction A3 of the electric work machine 1 is referred to as the vehicle body width direction.

[0020] The traveling device 10 is a device that causes the machine body 2 to travel, and has a traveling frame 11 and a traveling mechanism 12. The traveling frame (track frame) 11 is a structure to which the traveling mechanism 12 is attached around its periphery and which supports the machine body 2 on its upper portion. The traveling mechanism 12 is, for example, a crawler type traveling mechanism. The traveling mechanism 12 is provided on each of the left and right sides of the traveling frame 11. The traveling mechanism 12 has an idler 13, a driving wheel 14, a plurality of rollers 15, an endless crawler belt 16, and traveling motors (a left traveling motor ML and a right traveling motor MR).

[0021] The idler 13 is disposed at the front of the traveling frame 11. The drive wheels 14 are disposed at the rear of the traveling frame 11. A plurality of rollers 15 are provided between the idler 13 and the drive wheels 14. The crawler belt 16 is wound around the idler 13, the drive wheels 14, and the rollers 15. The left travel motor ML is included in the travel mechanism 12 on the left side of the travel frame 11. The right travel motor MR is included in the travel mechanism 12 on the right side of the travel frame 11. The left travel motor ML and the right travel motor MR are composed of hydraulic motors. In each travel mechanism 12, the drive wheels 14 are rotated by the power of the left travel motor ML and the right travel motor MR, causing the crawler belt 16 to circulate in the circumferential direction.

[0022] A dozer device 18 is attached to the front of the traveling device 10. The dozer device 18 swings up and down by the expansion and contraction of a hydraulic actuator C5 (dozer cylinder). The hydraulic actuator C5 (dozer cylinder) is attached to the traveling frame 11. The hydraulic actuator C5 (dozer cylinder) is composed of a hydraulic cylinder. The machine body 2 is supported on a traveling frame 11 via a swivel bearing 3 so as to be rotatable about a swivel axis X. A swivel motor MT is provided inside the machine body 2. The swivel motor MT is composed of a hydraulic motor (a hydraulic actuator included in hydraulic equipment M). The machine body 2 rotates about the swivel axis X by the power of the swivel motor MT.

[0023] The working device 20 is supported at the front of the machine body 2. The working device 20 has a boom 21, an arm 22, a bucket (working tool) 23, and hydraulic actuators C1 to C5. The base end side of the boom 21 is pivotally attached to a swing bracket 24 so as to be rotatable around a horizontal axis (an axis extending in the width direction of the machine body 2). Therefore, the boom 21 can swing up and down (vertically). The arm 22 is pivotally attached to the tip side of the boom 21 so as to be rotatable around the horizontal axis. Therefore, the arm 22 can swing in the front-rear direction or the up-down direction. The bucket 23 is provided at the tip side of the arm 22 so as to be capable of scooping and dumping operations.

[0024] The electric work machine 1 can be equipped with other working tools (hydraulic attachments) that can be driven by a hydraulic actuator, instead of or in addition to the bucket 23. Examples of such working tools include a hydraulic breaker, a hydraulic crusher, an angle broom, an earth auger, a pallet fork, a sweeper, a mower, and a snow blower. The swing bracket 24 swings left and right by expanding and contracting a hydraulic actuator C1 (swing cylinder) provided in the machine body 2. The boom 21 swings up and down (front and back) by expanding and contracting a hydraulic actuator C2 (boom cylinder). The arm 22 swings up and down (front and back) by expanding and contracting a hydraulic actuator C3 (arm cylinder). The bucket 23 performs scooping and dumping operations by expanding and contracting a hydraulic actuator C4 (bucket cylinder: work tool cylinder). The hydraulic actuator C1 (swing cylinder), hydraulic actuator C2 (boom cylinder), hydraulic actuator C3 (arm cylinder), and hydraulic actuator C4 (bucket cylinder) are composed of hydraulic cylinders.

[0025] The electric work machine 1 performs work using a traveling device 10 having the above-mentioned travel motors (left travel motor ML, right travel motor MR) and hydraulic actuator C5, a work device 20 having hydraulic actuators C1-C4, and a swing motor MT. The traveling motors (left travel motor ML, right travel motor MR), swing motor MT, and hydraulic actuators C1-C5 are included in hydraulic equipment M. The traveling device 10 is also a work device provided on the electric work machine 1. Next, the electrical configuration of the electric operating machine 1 will be described.

[0026] Fig. 1 is an electrical block diagram of an electric work machine 1. A charging system S has the electric work machine 1 and an external quick charger 200. Fig. 1 shows the electric work machine 1 connected to the quick charger 200 via a charging cable 201. The operating device 5 of the electric work machine 1 has an operating lever 5a and an unloading lever 5b. The operating lever 5a and the unloading lever 5b can be operated by an operator seated in the driver's seat 4. The operating device 5 also has an operating section 5c.

[0027] The control device 7 is provided inside the machine body 2 or the protection mechanism 6, and has a CPU 7a and a storage unit 7b. The CPU 7a controls the operation of each part (electric motor 9, battery unit 30, inverter 38, each device, etc.) of the electric work machine 1 as shown in Fig. 1. The storage unit 7b is composed of a memory and the like. Information, data, and programs (e.g., control programs) used by the CPU 7a to control the operation of each part are stored in a readable and writable manner in the storage unit 7b.

[0028] The starter switch 8 is provided inside the protection mechanism 6, and can be operated by an operator seated in the driver's seat 4. The starter switch 8 is operated by the operator to start and stop the electric work machine 1. In more detail, when the starter switch 8 is turned on, the control device 7 starts each part of the electric work machine 1. On the other hand, when the starter switch 8 is turned off, the control device 7 stops each part of the electric work machine 1.

[0029] The electric motor 9 is a drive source for the electric work machine 1 and is, for example, a permanent magnet embedded type three-phase AC synchronous motor. The inverter 38 is a motor drive device that drives the electric motor 9. The inverter 38 is connected to the electric motor 9 and a junction box 39. The junction box 39 is connected to the inverter 38, as well as to the battery unit 30, the DC-DC converter 40, and the charging port 41. The junction box 39 outputs the power output from the battery unit 30 to the inverter 38 and the DC-DC converter 40.

[0030] The inverter 38 converts the DC power input from the battery unit 30 via the junction box 39 into three-phase AC power, and supplies the three-phase AC power to the electric motor 9. This drives the electric motor 9. The inverter 38 can also arbitrarily adjust the current and voltage of the power supplied to the electric motor 9. The control device 7 controls the operation of the inverter 38 to drive or stop the electric motor 9.

[0031] The DC-DC converter 40 is a voltage conversion device that converts the DC voltage input from the battery unit 30 via the junction box 39 into a different voltage. In this embodiment, the DC-DC converter 40 is a step-down converter that converts the high voltage of the battery unit 30 into a predetermined low voltage according to the electrical equipment provided in the electric work machine 1. The DC-DC converter 40 supplies power to the low-voltage battery 33 after voltage conversion. The electrical equipment includes, for example, the control device 7, fan motors 35a, 37a, 42b described below, and other devices (a connection detection device 41a, an electric heating device 42, an electric cooling device 46, an oil temperature detection device 47, a room temperature detection device 48, a water temperature detection device 49, a display device 123, etc.).

[0032] Charging port 41 (connection portion) can be connected to charging cable 201. For example, charging port 41 is a receptacle (receiving connector) into which connector 202 of charging cable 201 is fitted, and has a connection detection device 41a. Charging port 41 is connected to external quick charger 200 via charging cable 201. Connection detection device 41a is made up of a sensor and the like that detects that charging cable 201 is connected to charging port 41 and that external quick charger 200 is connected.

[0033] The external quick charger 200 is a charger capable of outputting a large current (for example, a maximum of about 125 amperes) and has, for example, an output performance of 125 amperes x 500 volts. Note that the quick charger 200 is not limited to the above output performance, and may be a charger having, for example, an output performance of 400 amperes x 1000 volts. 2, when the electric operating machine 1 and the quick charger 200 are connected by a charging cable 201, charging is performed using, for example, a known charging communication standard. In this embodiment, a case where charging is performed using, for example, the CHAdeMO (registered trademark) charging communication standard will be described. The charging cable 201 has a power line 201a, a CAN (Controller Area Network) signal line 201b, and an analog line 201c.

[0034] For example, the quick charger 200 transmits a charging start signal to the electric work machine 1 via the analog line 201c. The electric work machine 1 transmits battery information to the quick charger 200 via the CAN signal line 201b. The quick charger 200 transmits charger information (operation status) of the quick charger 200 to the electric work machine 1 via the CAN signal line 201b. The electric work machine 1 transmits a preparation completion signal to the quick charger 200 via the analog line 201c. The quick charger 200 transmits a charging permission signal to the electric work machine 1 via the analog line 201c. The electric work machine 1 transmits charging parameters (current command value) to the quick charger 200 via the CAN signal line 201b at predetermined repetition periods (for example, 100 ms). The quick charger 200 outputs a direct current according to the charging parameters (current command value) to the battery unit 30 of the electric work machine 1 via the power line 201a. When charging is completed or an abnormal stop occurs, the electric work machine 1 transmits a charging stop request to the quick charger 200 via the analog line 201c. Note that the charging communication standard is not limited to the CHAdeMO (registered trademark) system, and a charging system according to another charging communication standard may be used.

[0035] The junction box 39 outputs the electric power input from the external quick charger 200 via the charging cable 201 through the charging port 41 to the battery unit 30. The battery unit 30 is charged with the electric power input from the charging port 41 through the junction box 39. The battery unit 30 has a plurality of batteries 31, 32. Each of the batteries 31, 32 is a secondary battery (storage battery) such as a lithium ion battery that is composed of at least one battery. When each of the batteries 31, 32 is composed of a plurality of batteries, the plurality of batteries are electrically connected in series and / or parallel. Furthermore, the batteries that make up each of the batteries 31, 32 have a plurality of cells therein, and the plurality of cells are electrically connected in series and / or parallel. Each of the batteries 31, 32 has an electric capacity that can operate each part of the electric work machine 1 for a predetermined period of time. The batteries 31, 32 are connected in parallel to each other.

[0036] In this embodiment, the battery unit 30 is provided with two batteries 31, 32, but the number of batteries included in the battery unit 30 is not limited to two, and may be one, or three or more. Connection switching units 31a, 32a are provided in the batteries 31, 32. Each of the connection switching units 31a, 32a is configured with, for example, a relay or a switch, and is capable of switching between a connected state and a cut-off state.

[0037] The control device 7 switches one of the connection switching units 31a, 32a to a connected state and switches the other connection switching unit to a disconnected state, thereby outputting power from one of the batteries 31, 32 to the junction box 39 and stopping the output of power from the other battery. In other words, the control device 7 controls the output and stop of power output from each of the batteries 31, 32.

[0038] In addition, the control device 7 switches the internal connection state of the junction box 39 to connect or disconnect the inverter 38, the DC-DC converter 40, or the charging port 41 to each of the batteries 31, 32. The junction box 39 and the connection switching units 31a, 32a form a connection switching device that switches between connection and disconnection of the inverter 38, the DC-DC converter 40, and the charging port 41 to each of the batteries 31, 32.

[0039] Further, BMUs (battery management units) 31b and 32b are provided in the batteries 31 and 32, respectively. In FIG. 1, the BMUs 31b and 32b are provided in the corresponding batteries 31 and 32, but they may be provided outside the batteries 31 and 32. The BMU 31b monitors and controls the corresponding battery 31. The BMU 32b monitors and controls the corresponding battery 32. Specifically, the BMUs 31b and 32b control the opening and closing of relays provided inside the batteries 31 and 32 to control the start and stop of power supply from the batteries 31 and 32 to the junction box 39. The BMUs 31b and 32b also monitor the states of the batteries 31 and 32. For example, the BMUs 31b and 32b detect the temperature, voltage, current, terminal voltage of the internal cells, etc. of the batteries 31 and 32.

[0040] Furthermore, the BMUs 31b and 32b detect the remaining capacity of the batteries 31 and 32 by a voltage measurement method based on, for example, the terminal voltages of the cells inside the batteries 31 and 32. Note that the method of detecting the remaining capacity of the batteries 31 and 32 is not limited to the voltage measurement method, and may be other methods such as a coulomb counter method, a battery cell modeling method, an impedance track method, etc. Also, a capacity detection device 34 that detects the remaining capacity of the batteries 31 and 32 may be provided separately from the BMUs 31b and 32b.

[0041] In this embodiment, the electric operating machine 1 includes two BMUs 31b, 32b, but may include only one BMU 31b. In this case, the single BMU 31b monitors and controls both the batteries 31, 32. The low-voltage battery 33 is a storage battery with a lower voltage than the battery unit 30. The low-voltage battery 33 is charged with power supplied from a DC-DC converter 40. The low-voltage battery 33 supplies power to electrical components provided in the electric work machine 1. The capacity detection device 34 is composed of an electric circuit that detects the remaining capacity of the low-voltage battery 33.

[0042] The radiator 35 cools the cooling water for cooling high heat generating electrical equipment such as the electric motor 9, the inverter 38, the DC-DC converter 40, and the battery unit 30. High heat generating electrical equipment is electrical equipment that, when operated with electric power, generates more heat than other electrical equipment provided in the electric work machine 1. The cooling water is not simply water, but is made of a liquid that does not freeze, for example, even in cold regions.

[0043] The radiator 35 includes a fan motor 35a, a radiator fan 35f that is driven to rotate by the power of the fan motor 35a, and a heat exchanger 35b (shown in FIG. 5, which will be described later). The fan motor 35a is driven by the electric power of the low-voltage battery 33. The cooling pump 36, together with the radiator 35 and the high heat generating electrical equipment, is provided in a cooling water passage (not shown) disposed inside the aircraft body 2. The cooling pump 36 discharges and circulates cooling water to the cooling water passage.

[0044] The oil cooler 37 cools the hydraulic oil that has passed through hydraulic equipment such as the travel motors (left travel motor ML, right travel motor MR), swing motor MT, hydraulic actuators C1-C5, hydraulic pumps P1, P2, and control valve V (shown in FIG. 4, etc.) described below. The oil cooler 37 has a fan motor 37a, an oil cooler fan 37f that is driven to rotate by the power of the fan motor 37a, and a heat exchanger 37b (shown in FIG. 5, described below). The fan motor 37a is driven by the power of the low-voltage battery 33.

[0045] The electric heating device 42 is driven by power from the low-voltage battery 33 to heat the inside of the protection mechanism 6. The electric heating device 42 is composed of an electric heater, and has a heating wire 42a, a fan motor 42b, and a heating fan (not shown). The heating wire 42a generates high heat when electricity is applied. The fan motor 42b drives and rotates the heating fan. The heating fan blows the surrounding air, which has been warmed by the heating wire 42a, towards the inside of the protection mechanism 6. The fan motor 42b is driven by power from the low-voltage battery 33.

[0046] The electric cooling device 46 is configured by, for example, an air conditioner. The electric cooling device 46 is driven by power from the low-voltage battery 33 to cool the inside of the protection mechanism 6. The electric heating device 42 and the electric cooling device 46 are air conditioning devices that air condition the inside of the protection mechanism 6. The oil temperature detection device 47 is made up of a sensor that detects the temperature of the hydraulic oil (oil temperature). The room temperature detection device 48 is made up of a sensor that detects the temperature (room temperature) inside the protection mechanism 6. The water temperature detection device 49 is made up of a sensor that detects the temperature of the cooling water (water temperature).

[0047] The control device 7 has a fan control unit 7c. The fan control unit 7c controls the driving of the fan motor 35a of the radiator 35. For example, the fan control unit 7c controls the driving of the fan motor 35a of the radiator 35 based on the temperature of the coolant detected by the water temperature detection device 49 and a preset control map so that the temperature of the coolant does not exceed a set temperature. In addition, the fan control unit 7c stops the driving of the fan motor 37a of the oil cooler 37 when the temperature of the hydraulic oil detected by the oil temperature detection device 47 is less than a predetermined value, and controls the temperature of the hydraulic oil not to exceed a set temperature based on the preset control map when the temperature of the hydraulic oil detected by the oil temperature detection device 47 is equal to or higher than a predetermined value.

[0048] As shown in Fig. 3A, the operation unit 5c is an operation switch 5c1 that is normally used to set the motor rotation speed of the electric motor 9. The operation switch 5c1 is, for example, a rotation speed operating tool, and can accept any value within the range of the motor rotation speed of the electric motor 9 (for example, 1500 to 2600 rpm) as the setting value from the operator. For example, when the operation switch 5c1 indicates the position of a turtle mark, the motor rotation speed is the minimum value (for example, 1500 rpm), and when the operation switch 5c1 indicates the position of a rabbit mark, the motor rotation speed is the maximum value (for example, 2600 rpm).

[0049] When charging cable 201 is disconnected from charging port 41, control device 7 accepts an operation on operation unit 5c (e.g., operation switch 5c1) as an operation for setting the motor rotation speed of electric motor 9. Control device 7 has rotation speed control unit 7d. Rotation speed control unit 7d controls the rotation of electric motor 9 at the motor rotation speed set by operation switch 5c1. Furthermore, the operation switch 5c1 can be used to set charging parameters during charging other than normal times. Specifically, when the charging cable 201 is connected to the charging port 41, the control device 7 accepts an operation on the operation unit 5c (e.g., the operation switch 5c1) as an operation for setting charging parameters. The charging parameters include at least one of a current value, a charging time, a charging amount, and a charging speed.

[0050] As described above, the operation switch 5c1 can set the motor rotation speed of the electric motor 9 in normal operation and can set the charging parameters in charging operation. As shown in FIG. 3A, the operation unit 5c has a display 5c2. The display 5c2 is, for example, a light-emitting diode, and is turned off in normal operation (when the motor rotation speed is set) and turned on in charging operation (when the charging parameters are set). The display 5c2 may be turned on in normal operation (when the motor rotation speed is set) and turned off in charging operation (when the charging parameters are set). The display 5c2 may be a character display that displays an operating state such as "normal state" or "charging state". The operation unit 5c also has an indicator display 5c3. The indicator display 5c3 is a display that indicates the operating position of the operation switch 5c1. The indicator display 5c3 is provided with a unit memory display that divides the setting range from the minimum value to the maximum value into a plurality of ranges, and the unit memory display from the minimum value to the operating position of the operation switch 5c1 is turned on.

[0051] The control device 7 changes the value of the current supplied from the rapid charger 200 to the battery unit 30 according to the charging parameters set by the operation section 5c (e.g., operation switch 5c1). Specifically, the control device 7 has a charging parameter command section 7e that outputs the charging parameters set by the operation switch 5c1 to the external rapid charger 200 via the charging cable 201 during charging. The external rapid charger 200 changes the value of the current (DC current output) supplied to the battery unit 30 of the electric work machine 1 based on the charging parameters transmitted from the charging parameter command section 7e. Since the BMU 31b and the BMU 32b have the same configuration, the BMU 31b will be described and the description of the BMU 32b will be omitted. In other words, the configuration of the BMU 31b, the control device 7, and the battery 31 described below is equivalent to the configuration of the BMU 32b, the control device 7, and the battery 32.

[0052] The BMU 31b can determine the allowable range of the charging parameter based on the state of the battery 31 (for example, the temperature of the battery 31). For example, in the case where the charging parameter is a current value, when the temperature of the battery 31 is a first temperature (for example, low temperature) sufficiently lower than the usage limit temperature of the battery 31 (a temperature that is set in advance as a temperature at which the charging current value and / or the output current value needs to be suppressed in order to suppress a temperature rise of the battery 31), the BMU 31b sets the charging parameter to a first value (for example, a current value of 50 amperes) and sets the charging parameter to a first allowable range with the first value as an upper limit, and when the temperature of the battery 31 is a second temperature (for example, medium temperature) that is lower than the usage limit temperature of the battery 31 and higher than the first temperature, the BMU 31b sets the charging parameter to a second value (for example, a current value of 30 amperes) and sets the charging parameter to a second allowable range with the second value as an upper limit. Note that the allowable range of the charging parameter is not limited to two, and may be three or more. The first value and the second value are not limited to the above values, and may be, for example, about 120 amperes, and the second value about 80 amperes, as long as they satisfy the relationship of the first value of the first allowable range > the second value of the second allowable range (similar below). In this way, the BMU 31b can determine the allowable range of the charging parameters based on the state of the battery 31 (for example, the temperature of the battery 1). In other words, the BMU 31b can appropriately adjust the output current value of the quick charger 200, rather than uniformly charging with the maximum current (for example, 125 amperes) of the quick charger 200.

[0053] Furthermore, when the charging parameter is the charging time, the BMU 31b sets the charging parameter to a first value (e.g., 60 minutes) and a first allowable range with the first value as an upper limit when the temperature of the battery 31 is a first temperature, and sets the charging parameter to a second value (e.g., 30 minutes) and a second allowable range with the second value as an upper limit when the temperature of the battery 31 is a second temperature. Furthermore, when the charging parameter is the charging amount, the BMU 31b sets the charging parameter to a first value (e.g., 80% of the charging amount per unit time) and a first allowable range with the first value as an upper limit when the temperature of the battery 31 is a first temperature, and sets the charging parameter to a second value (e.g., 40% of the charging amount per unit time) and a second allowable range with the second value as an upper limit when the temperature of the battery 31 is a second temperature. In addition, when the charging parameter is a charging speed, BMU 31b sets the charging parameter to a first value (e.g., high speed) and a first allowable range with the first value as an upper limit when the temperature of battery 31 is a first temperature, and sets the charging parameter to a second value (e.g., medium speed) and a second allowable range with the second value as an upper limit when the temperature of battery 31 is a second temperature.

[0054] The control device 7 causes the display device 123 to display the allowable range determined by the BMU 31b, and if the charging parameters set by the operation switch 5c1 are within the allowable range, outputs the charging parameters to the rapid charger 200, and if the charging parameters are not within the allowable range, does not output the charging parameters and causes the display device 123 to display a message prompting the user to reset the parameters.

[0055] The control device 7 causes the display device 123 to display the charging parameters set by the operation switch 5c1 and the temperature of the battery 31 detected by the BMU 31b. The operation switch 5c1 is capable of setting changed charging parameters. When changed charging parameters are set by the operation switch 5c1, the control device 7 (e.g., charging parameter command unit 7e) outputs the changed charging parameters to the quick charger 200 via the charging cable 201.

[0056] When the temperature value of battery 31 detected by BMU 31b becomes equal to or higher than a set temperature that is lower than the usage limit temperature of battery 31, control device 7 changes the charging parameters set in operation switch 5c1 to changed charging parameters for making the temperature of battery 31 lower than the set temperature. Charging parameter command unit 7e outputs the changed charging parameters to quick charger 200 via charging cable 201.

[0057] The BMU 31b calculates a predicted charging time using the target charge amount of the battery 31, the remaining capacity of the battery 31, the charging parameters set by the operation switch 5c1, and the charging capacity per unit time. The predicted charging time is the time required to charge the battery up to the target charge amount. The control device 7 causes the display device 123 to display the predicted charging time. The BMU 31b determines whether or not charging of the battery 31 needs to be stopped based on at least one of the temperature, current, voltage, remaining capacity, and charging time of the battery 31. The control device 7 (e.g., the charging parameter command unit 7e) outputs a charging stop request to the quick charger 200 when the BMU 31b determines that charging needs to be stopped.

[0058] Next, a hydraulic circuit provided in the electric work machine 1 will be described. FIG. 4 is a diagram showing a hydraulic circuit K provided in the electric working machine 1. The hydraulic circuit K is provided with hydraulic equipment such as hydraulic actuators C1 to C5, travel motors (left travel motor ML, right travel motor MR), a swing motor MT, a control valve V, hydraulic pumps P1, P2, a hydraulic oil tank T, an oil cooler 37, operating valves PV1 to PV6, an unload valve 58, and an oil passage 50. The hydraulic pump P1 is a hydraulic pump for actuation, and the hydraulic pump P2 is a hydraulic pump for control. These hydraulic pumps P1 and P2 are driven by the power of an electric motor 9.

[0059] The hydraulic pump P1 (actuating hydraulic pump) draws in hydraulic oil stored in a hydraulic oil tank T and then discharges the hydraulic oil toward a control valve V. In FIG. 4, for convenience, one hydraulic pump P1 (actuating hydraulic pump) is illustrated, but this is not limiting, and an appropriate number of hydraulic pumps P1 (actuating hydraulic pumps) may be provided so as to be able to supply hydraulic oil to each of the hydraulic actuators C1 to C5, the travel motors (left travel motor ML, right travel motor MR), and the swing motor MT. The hydraulic pump P2 (hydraulic pump for control) outputs hydraulic pressure for signals, control, etc. by drawing in and then discharging hydraulic oil stored in the hydraulic oil tank T. In other words, the hydraulic pump P2 (hydraulic pump for control) supplies (discharges) pilot oil. An appropriate number of hydraulic pumps P2 (hydraulic pumps for control) may be provided. 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 each of the hydraulic actuators C1 to C5, the left travel motor ML, the right travel motor MR, and the swing motor MT.

[0060] Specifically, the control valve V1 (swing control valve) controls the flow rate of hydraulic oil supplied to the hydraulic actuator C1 (swing cylinder). The control valve V2 (boom control valve) controls the flow rate of hydraulic oil supplied to the hydraulic actuator C2 (boom cylinder). The control valve V3 (arm control valve) controls the flow rate of hydraulic oil supplied to the hydraulic actuator C3 (arm cylinder). The control valve V4 (bucket control valve) controls the flow rate of hydraulic oil supplied to the hydraulic actuator C4 (bucket cylinder). The control valve V5 (dozer control valve) controls the flow rate of hydraulic oil supplied to the hydraulic actuator C5 (dozer cylinder). The control valve V6 (left travel control valve) controls the flow rate of hydraulic oil supplied to the left travel motor ML. The control valve V7 (right travel control valve) controls the flow rate of hydraulic oil supplied to the right travel motor MR. The control valve V8 (swing control valve) controls the flow rate of hydraulic oil supplied to the swing motor MT.

[0061] The operating valves PV1 to PV6 operate in response to the operation of various operating levers 5a (FIG. 1) provided on the operating device 5. Pilot oil acts on each of the control valves V1 to V8 in proportion to the amount of operation (amount of operation) of each of the operating valves PV1 to PV6, thereby moving the spools of each of the control valves V1 to V8. Then, an amount of hydraulic oil proportional to the amount by which the spools of each of the control valves V1 to V8 are moved is supplied to the hydraulic actuators C1 to C5, left travel motor ML, right travel motor MR, and swing motor MT that are the objects of control. Furthermore, each of the hydraulic actuators C1 to C5, left travel motor ML, right travel motor MR, and swing motor MT is driven in response to the amount of hydraulic oil supplied from each of the control valves V1 to V8.

[0062] In other words, by operating the operation lever 5a, the hydraulic oil (pilot oil) acting on the control valves V1 to V8 is adjusted to control the control valves V1 to V8. Then, the amount of hydraulic oil supplied from the control valves V1 to V8 to the hydraulic actuators C1 to C5, the left travel motor ML, the right travel motor MR, and the swing motor MT is adjusted to control the driving and stopping of the hydraulic actuators C1 to C5, the left travel motor ML, the right travel motor MR, and the swing motor MT. The oil passage 50 is composed of, for example, a hose or a pipe made of a material such as metal. The oil passage 50 is a flow path that connects each part (hydraulic equipment) provided in the hydraulic circuit K and flows hydraulic oil or pilot oil to each part. The oil passage 50 includes a first oil passage 51, a second oil passage 52, a first suction oil passage 54, a second suction oil passage 55, and a restriction oil passage 57.

[0063] The first suction oil passage 54 is a flow path through which the hydraulic oil drawn by the hydraulic pump P1 (hydraulic pump for operation) from the hydraulic oil tank T flows. The second suction oil passage 55 is a flow path through which the hydraulic oil drawn by the hydraulic pump P2 (hydraulic pump for control) from the hydraulic oil tank T flows. The first oil passage 51 is a flow path through which hydraulic oil discharged from the hydraulic pump P1 (hydraulic pump for operation) flows toward the control valves V1 to V8 of the control valve V. The first oil passage 51 branches into a plurality of passages within the control valve V and is connected to each of the control valves V1 to V8. The second oil passage 52 is a flow path that allows the hydraulic oil that has passed through the control valves V1 to V8 to flow toward the hydraulic oil tank T. The hydraulic oil tank T stores the hydraulic oil. The second oil passage 52 includes a reciprocating oil passage 52a and a discharge oil passage 52b.

[0064] The reciprocating oil passages 52a are provided in a plurality of pairs so as to connect each of the control valves V1 to V8 to the hydraulic actuators C1 to C5, the left travel motor ML, the right travel motor MR, and the swing motor MT to be controlled. The reciprocating oil passages 52a are flow paths that supply hydraulic oil from the connected control valves V1 to V8 to the hydraulic actuators C1 to C5, the left travel motor ML, the right travel motor MR, and the swing motor MT, and return hydraulic oil from the hydraulic actuators C1 to C5, the left travel motor ML, the right travel motor MR, and the swing motor MT to the control valves V1 to V8. One end of the discharge oil passage 52b branches into a plurality of passages and is connected to each of the control valves V1 to V8. The other end of the discharge oil passage 52b is connected to a hydraulic oil tank T.

[0065] A part of the hydraulic oil that has flowed through the first oil passage 51 to any of the control valves V1-V8 passes through the control valves V1-V8 and passes through one side of the reciprocating oil passage 52a to be supplied to the hydraulic actuators C1-C5, the left travel motor ML, the right travel motor MR, and the swing motor MT that are the control targets. Then, the hydraulic oil discharged from the hydraulic actuators C1-C5, the left travel motor ML, the right travel motor MR, and the swing motor MT returns to the connected control valves V1-V8 through the other side of the reciprocating oil passage 52a, passes through the control valves V1-V8, and flows to the discharge oil passage 52b.

[0066] The other part of the hydraulic oil that flows through the first oil passage 51 to any of the control valves V1-V8 passes through the control valves V1-V8 and flows to the discharge oil passage 52b without being supplied to the hydraulic actuators C1-C5, the left travel motor ML, the right travel motor MR, or the swing motor MT. An oil cooler 37 is provided in the discharge oil passage 52b. The oil cooler 37 cools the hydraulic oil that flows from any of the control valves V1-V8 through the discharge oil passage 52b. The hydraulic oil cooled by the oil cooler 37 passes through the discharge oil passage 52b and returns to the hydraulic oil tank T. As described above, the oil passages 54, 51, and 52 are arranged to circulate the hydraulic oil to the hydraulic oil tank T, the hydraulic pump P1, and the control valves V1 to V8 of the control valve V (and some of the hydraulic oil to the hydraulic actuators C1 to C5, the left travel motor ML, the right travel motor MR, and the swing motor MT).

[0067] The limit oil passage 57 is a flow path that allows the hydraulic oil discharged by the hydraulic pump P2 (hydraulic pump for control) to flow to the operation valves PV1 to PV6. One end of the limit oil passage 57 is connected to the hydraulic pump P2 (hydraulic pump for control), and the other end is branched into a plurality of passages that are connected to the primary side ports (primary ports) of each of the operation valves PV1 to PV6. An unloading valve 58 is provided in the restriction oil passage 57. The unloading valve 58 prohibits or restricts the drive of the hydraulic actuators C1 to C5, the left travel motor ML, the right travel motor MR, and the swing motor MT, i.e., the drive of the working device 20, by cutting off the supply of hydraulic oil from the hydraulic pump P1 (operational hydraulic pump) to the hydraulic actuators C1 to C5, the left travel motor ML, the right travel motor MR, and the swing motor MT.

[0068] In detail, the unloading valve 58 is switched between a supply position and a cutoff position by the operator operating the unloading lever 5b. When the unloading valve 58 is switched to the supply position, hydraulic oil discharged from the hydraulic pump P2 (control hydraulic pump) to the restriction oil passage 57 is supplied to the operation valves PV1 to PV6, enabling the operation of the control valves V1 to V8. This also enables the operation of the hydraulic actuators C1 to C5, the left traveling motor ML, the right traveling motor MR, the swing motor MT, the working device 20, and the traveling device 10. The hydraulic oil discharged from the operation valves PV1 to PV6 returns to the hydraulic oil tank T through a separate discharge oil passage (not shown).

[0069] On the other hand, by switching the unload valve 58 to the shutoff position, the hydraulic oil discharged from the hydraulic pump P2 (control hydraulic pump) to the restriction oil passage 57 is discharged into the hydraulic oil tank T and is no longer supplied to the operation valves PV1 to PV6 (supply stopped), and operation of the control valves V1 to V8 is prohibited or limited. This also prohibits or limits operation of the hydraulic actuators C1 to C5, left traveling motor ML, right traveling motor MR, swing motor MT, working device 20, and traveling device 10.

[0070] Next, the layout inside the body 2 of the electric work machine 1 will be described. Fig. 5 is a diagram showing an example of the arrangement inside the body 2 of the electric work machine 1. Fig. 5 shows the inside of the body 2 as viewed from above. Inside the body 2, the control valve V is disposed in front of the swivel bearing 3 (A1 direction side). The hydraulic oil tank T is disposed to the right of the swivel bearing 3 and above the hydraulic actuator C1 (swing cylinder). A partition plate 80 is provided behind the swivel bearing 3 at A2 in parallel with the width direction of the body 2. The partition plate 80 divides the internal space of the body 2 into front and rear.

[0071] A rear room R is provided behind the partition plate 80 (on the A2 side). In the rear room R, a battery unit 30, an inverter 38, a junction box 39, a DC-DC converter 40, hydraulic pumps P1 and P2, an electric motor 9, a radiator 35, an oil cooler 37, etc. are provided. The batteries 31, 32 of the battery unit 30 are arranged side by side in the width direction of the fuselage 2. The inverter 38, the junction box 39, and the DC-DC converter 40 are arranged above the batteries 31, 32.

[0072] The hydraulic pumps P1, P2, the electric motor 9, the radiator 35, and the oil cooler 37 are disposed on the right side of the battery unit 30. The electric motor 9 is disposed behind the hydraulic pumps P1, P2. The radiator 35 is disposed above the electric motor 9. The heat exchanger 35b of the radiator 35 is disposed closer to the battery unit 30 than the radiator fan 35f. The oil cooler 37 is disposed above the hydraulic pumps P1, P2. The heat exchanger 37b of the oil cooler 37 is disposed closer to the battery unit 30 than the oil cooler fan 37f.

[0073] The partition plate 80 is formed with a plurality of through holes 81, 82, 83. For example, hoses (not shown) constituting the oil passage 50, electrical wiring, etc. are inserted into the through holes 81, 82, 83. The through holes 81, 82, 83 may also be used as ventilation holes. A protection mechanism 6 (operator cab 4R) is mounted above the fuselage 2. Next, a procedure for charging the electric operating machine 1 using the external quick charger 200 will be described. Here, it is assumed that the BMU 31b has determined that the detected remaining capacity of the battery 31 has fallen below a specified value and has output a low-capacity signal indicating that the remaining capacity of the battery 31 is low to the control device 7. It is also assumed that the detected remaining capacity of the battery 32 exceeds a specified value and the BMU 32b has not output a low-capacity signal to the control device 7. Based on the low-capacity signal from the BMU 31b, the control device 7 causes the display device 123 of the electric operating machine 1 to display a message M1 suggesting charging, as shown in FIG. 6A. The message M1 is, for example, a message requesting charging.

[0074] 6A, the display device 123 has a coolant temperature display unit 123a. The coolant temperature display unit 123a displays the temperature of the coolant detected by the water temperature detection device 49. 6A, the display device 123 has a battery remaining capacity display unit 123b. The battery remaining capacity display unit 123b displays the remaining capacity of the battery unit 30 (e.g., batteries 31, 32) detected by the BMU 31b. For example, the battery remaining capacity display unit 123b displays the remaining capacity of the battery having the smallest remaining capacity among the batteries 31, 32. Here, since the remaining capacity of the battery 31 is small, the remaining capacity of the battery 31 is displayed. Note that the battery remaining capacity display unit 123b may switch the remaining capacity of the batteries 31, 32 in accordance with a selection operation of the operating device 5. The battery remaining capacity display unit 123b may also display the total remaining capacity of the batteries 31, 32.

[0075] When the control device 7 receives the low capacity signal from the BMU 31b, it executes the charging start process shown in Fig. 7A. Fig. 7A is a flowchart showing an example of the charging start process of the electric operating machine 1 using the external quick charger 200. Specifically, the CPU 7a of the control device 7 in Fig. 1 executes a control program stored in advance in the storage unit 7b, whereby the charging start process shown in Fig. 7A by the control device 7 is started. The control device 7 determines whether or not a charging cable is connected (S1). As shown in Fig. 2, the worker connects the external quick charger 200 and the electric work machine 1 with the charging cable 201. Specifically, the worker connects the connector 202 of the charging cable 201 connected to the external quick charger 200 to the charging port 41 of the electric work machine 1.

[0076] The connection detection device 41a outputs a connection detection signal to the control device 7 when the charging cable 201 is connected to the charging port 41, and does not output the connection detection signal to the control device 7 when the charging cable 201 is not connected to the charging port 41. When the charging cable 201 is connected to the charging port 41 (Yes in S1), the control device 7 sets the charging mode (S2). The control device 7 causes the display device 123 to display, for example, a charging mode screen shown in FIG. 6B. When the control device 7 sets the charging mode, the display device 123 causes the battery temperature display unit 123c shown in FIG. 6B to display instead of the cooling water temperature display unit 123a shown in FIG. 6A. The battery temperature display unit 123c displays the temperature of the battery unit 30 (for example, the battery 31) detected by the BMU 31b. Here, the remaining capacity of the battery 31 is low, so the remaining capacity of the battery 31 is displayed. On the other hand, if the charging cable 201 is not connected to the charging port 41 (No in S1), the control device 7 returns to S1 and waits until the charging cable 201 is connected. After S2, the control device 7 performs CAN (Controller Area Network) communication with the external quick charger 200 (S3).

[0077] Specifically, the quick charger 200 transmits a charging start signal to the electric work machine 1 through the analog line 201c of the charging cable 201. When the control device 7 of the electric work machine 1 receives the charging start signal from the quick charger 200, it starts CAN communication through the CAN signal line 201b and transmits information of the battery 31 (e.g., the maximum voltage, remaining capacity, maximum charging time of the battery 31, etc.) to the quick charger 200 through the CAN signal line 201b. The quick charger 200 transmits charger information (e.g., maximum voltage, maximum current (e.g., 125 amperes), abnormality determination value, etc.) to the electric work machine 1 through the CAN signal line 201b. The control device 7 of the electric work machine 1 determines the suitability of the quick charger 200 (whether the quick charger 200 is suitable for charging the battery 31) based on the charger information. When the control device 7 determines suitability, it transmits a preparation completion signal to the quick charger 200 through the analog line 201c. When the quick charger 200 receives the preparation completion signal, it performs an insulation diagnosis, and if the insulation diagnosis is good, it transmits a charge permission signal to the electric operating machine 1 via the analog line 201c.

[0078] After S3, the control device 7 displays the allowable range of the charging parameter on the display device 123 (S4). Specifically, the BMU 31b determines the allowable range of the charging parameter based on the state of the battery 31 (such as the temperature of the battery 31). For example, in the case where the charging parameter is a current value, the BMU 31b sets the allowable range of the charging parameter to a first allowable range with an upper limit of a first value (such as a current value of 50 amperes) when the temperature of the battery 31 is a first temperature (such as a low temperature) that is sufficiently lower than the usage limit temperature of the battery 31, and sets the allowable range of the charging parameter to a second allowable range with an upper limit of a second value (such as a current value of 30 amperes) when the temperature of the battery 31 is a second temperature (such as a medium temperature) that is lower than the usage limit temperature of the battery 31 and higher than the first temperature. The control device 7 acquires the allowable range of the charging parameter determined by the BMU 31b. Here, it is assumed that the first allowable range with an upper limit of the first value (such as a current value of 50 amperes) is determined as the allowable range of the charging parameter. Then, the control device 7 acquires the allowable range of the charging parameters determined by the BMU 31b, and displays it on the display device 123. The control device 7 displays a message M2 indicating the allowable range of the charging parameters (a message of "allowable range: 50 amperes or less") on the display device 123, as shown in Fig. 6B.

[0079] After S4, the control device 7 judges whether the charging parameter set by the operation switch 5c1 is within an allowable range (S5). The control device 7 displays the charging parameter (e.g., a current value) set by the operation switch 5c1 in the display field F1 of the display device 123, and if the charging parameter (e.g., a current value) displayed in the display field F1 is within the allowable range (Yes in S5), it accepts the setting of the charging parameter (S6) and outputs the charging parameter to the quick charger 200. Since a first allowable range with an upper limit of a first value (e.g., a current value of 50 amperes) is determined here, if the charging parameter set by the operation switch 5c1 is a charging parameter indicating a current value of 50 amperes or less, the control device 7 sets the charging parameter. Here, it is assumed that a current value of 50 amperes is set as the charging parameter by operating the operation switch 5c1, and is displayed in the display field F1 of the display device 123.

[0080] On the other hand, if the charging parameters set by operation switch 5c1 are not within the allowable range (No in S5), control device 7 does not output the charging parameters, causes display device 123 to display a message prompting the user to reset the charging parameters, and returns to S5. For example, if a current value exceeding 50 amperes (e.g., 100 amperes) is set by operation switch 5c1, control device 7 causes display device 123 to display a warning message saying "Please set a current value of 50 amperes or less," and does not output charging parameters indicating a current value of 100 amperes to quick charger 200.

[0081] After S6, the control device 7 executes charging control (S7). The charging control (S7) will be described with reference to Fig. 7B. Fig. 7B is a flowchart showing an example of charging control of an electric operating machine. The control device 7 transmits a current value of 50 amperes as the charging parameter set by operation of the operation switch 5c1 in S6 to the quick charger 200 via the CAN signal line 201b (S71).

[0082] The control device 7 judges whether the temperature value of the battery 31 detected by the BMU 31b is equal to or higher than a set temperature that is lower than the usage limit temperature of the battery 31 (S72). If the temperature value of the battery 31 is lower than the set temperature (No in S72), the control device 7 judges whether it is transmission timing (S73). The transmission timing is the timing when a predetermined period (e.g., 100 ms) has elapsed since the previous transmission of the charging parameters (here, a current value of 50 amperes), and is a timing that arrives periodically and repeatedly. The counter function of the control device 7 makes it possible to detect the arrival of the transmission timing every time. If it is transmission timing (Yes in S73), the control device 7 transmits the charging parameters (again, a current value of 50 amperes) to the quick charger 200 through the CAN signal line 201b (S74).

[0083] On the other hand, if it is not the transmission timing (No in S73), the control device 7 judges whether or not the state of the battery 31 detected by the BMU 31b is abnormal (S77). Abnormalities in the state of the battery 31 include temperature abnormalities, current abnormalities, voltage abnormalities, etc. of the battery 31. If the state of the battery 31 detected by the BMU 31b is not abnormal (No in S77), the control device 7 returns to S73. If the state of the battery 31 is abnormal (Yes in S77), the control device 7 transmits a charging stop request to the rapid charger 200 via the CAN signal line 201b to stop the DC current output by the rapid charger 200 and stop charging (S82). In S82, the control device 7 may display a message indicating that charging has been stopped on the display device 123. After S82, the control device 7 ends this process.

[0084] Incidentally, after S74, the control device 7 causes the display device 123 to display the predicted charging time calculated by the BMU 31b (S75). Here, it is assumed that a target charge amount (e.g., 80%) of the battery 31 is set in advance. Specifically, the BMU 31b calculates the predicted charging time using the target charge amount of the battery 31, the remaining capacity of the battery 31, the charging parameters set by the operation unit 5c, and the charging capacity per unit time. For example, the BMU 31b calculates the difference (e.g., 60%) between the target charge amount (e.g., 80%) and the remaining capacity (e.g., 20%). Then, the BMU 31b calculates the charging capacity per unit time using the charging parameters (current value of 50 amperes). Here, it is assumed that the charging capacity per unit time (e.g., minute) is "1%". Then, the BMU 31b divides the difference (e.g., 60%) by the charging capacity per unit time (1%) to calculate 60 minutes. The control device 7 acquires the estimated charging time (e.g., 60 minutes) calculated by the BMU 31b. The control device 7 causes the display device 123 to display the estimated charging time acquired from the BMU 31b. As shown in Fig. 6B, the control device 7 causes the display device 123 to display a message M3 indicating the estimated charging time (a message saying "60 minutes remaining until 80%")

[0085] The control device 7 judges whether or not charging is complete based on the state of the battery 31 detected by the BMU 31b (S76). As described above, a target charge amount (e.g., 80%) of the battery 31 is set in advance, and when the charge amount of the battery 31 reaches the target charge amount (e.g., 80%) (in other words, when the remaining capacity of the battery 31 reaches 80%), the control device 7 judges that charging is complete (Yes in S76) and ends this process. Note that, when a target charging time (e.g., 60 minutes) of the battery 31 is set in advance, the control device 7 judges that charging is complete (Yes in S76) and ends this process when the charging time of the battery 31 reaches the target charging time (e.g., 60 minutes).

[0086] In addition, when the target charge amount of the battery 31 is set to, for example, 100%, that is, when it is set to fully charged, when the BMU 31b detects that the battery 31 is fully charged (remaining capacity is "100%), the control device 7 determines that charging is complete (Yes in S76) and terminates this process. On the other hand, if the BMU 31b detects that the charge amount of the battery 31 has not reached the target charge amount (e.g., 80%), the control device 7 determines that charging is not complete (No in S76) and returns to S72. If the target charge amount of the battery 31 (e.g., 100%) is set in advance, that is, if full charge is set, the control device 7 determines that charging is not complete (No in S76) and returns to S72 if the BMU 31b does not detect that the battery 31 is fully charged (remaining capacity is "100%).

[0087] Now, suppose that, for example, 30 minutes have passed since the start of charging, and the temperature of the battery 31 has risen due to charging by the quick charger 200. As shown in FIG. 6C, the battery temperature display unit 123c displays that the temperature of the battery 31 is approaching a high temperature. In S72, if the temperature value of the battery 31 is equal to or higher than the set temperature (Yes in S72), the control device 7 sets the changed charging parameters (S78). Specifically, if the temperature value of the battery 31 is equal to or higher than the set temperature (Yes in S72), the control device 7 displays a message M4 prompting the user to set the changed charging parameters, as shown in FIG. 6C. The message M4 is, for example, a message saying "Please change the current value."

[0088] When the temperature of the battery 31 is a second temperature (e.g., medium temperature) that is lower than the usage limit temperature of the battery 31 and higher than the first temperature, the BMU 31b sets the charging parameters to a second value (e.g., a current value of 30 amperes) and sets the charging parameters to a second allowable range with the second value as the upper limit. The control device 7 acquires the allowable range of the charging parameters determined by the BMU 31b. Here, it is assumed that the second allowable range with the upper limit being the second value (e.g., a current value of 30 amperes) is determined as the allowable range of the charging parameters. Then, the control device 7 acquires the allowable range of the charging parameters determined by the BMU 31b and displays it on the display device 123. As shown in FIG. 6C, the control device 7 displays a message M5 indicating the allowable range of the charging parameters (a message saying "allowable range: 30 amperes or less") on the display device 123.

[0089] The control device 7 judges whether the charging parameters set by the operation switch 5c1 are included in the allowable range. If the charging parameters set by the operation switch 5c1 are included in the allowable range, the control device 7 accepts the setting of the changed charging parameters (S78). Here, since the second allowable range with the upper limit being the second value (for example, a current value of 30 amperes) is determined, if the changed charging parameters set by the operation switch 5c1 are a current value of 30 amperes or less, the control device 7 sets the changed charging parameters. Here, it is assumed that a current value of 30 amperes is set as the changed charging parameters by operating the operation switch 5c1. The control device 7 causes the display field F1 of the display device 123 to display the current value of 30 amperes as the changed charging parameters, as shown in FIG. 6D.

[0090] In addition, if the changed charging parameters set by the operation switch 5c1 are not within the acceptable range (i.e., a current value exceeding 30 amperes is specified), the control device 7 maintains S78 until changed charging parameters within the acceptable range (e.g., a current value of 30 amperes or less) are set. In S78, the control device 7 sets the changed charging parameters by the operation of the operation switch 5c1 by the operator, but is not limited to this. For example, the control device 7 may forcibly set the second value (e.g., a current value of 30 amperes) which is the upper limit of the second allowable range, regardless of the operation of the operation switch 5c1 by the operator. In this case, it is possible to save the operator the trouble of performing the setting operation, and it is highly convenient.

[0091] The control device 7 determines whether it is transmission timing (S79). If it is transmission timing (Yes in S79), the control device 7 transmits the changed charging parameters (current value of 30 amperes) to the quick charger 200 via the CAN signal line 201b (S80). After S80, the control device 7 causes the display device 123 to display the predicted charging time calculated by the BMU 31b (S75). Here, it is assumed that the predicted charging time is calculated to be "45 minutes." The control device 7 acquires the predicted charging time (e.g., 45 minutes) calculated by the BMU 31b. The control device 7 causes the display device 123 to display the predicted charging time acquired from the BMU 31b. As shown in FIG. 6D, the control device 7 causes the display device 123 to display a message M6 indicating the predicted charging time (a message saying "40 minutes remaining until 80%).

[0092] On the other hand, if it is not the transmission timing (No in S79), the control device 7 judges whether or not the state of the battery 31 detected by the BMU 31b is abnormal (S81). Abnormalities in the state of the battery 31 include temperature abnormality, current abnormality, voltage abnormality, etc. of the battery 31. If the state of the battery 31 detected by the BMU 31b is not abnormal (No in S81), the control device 7 returns to S79. If the state of the battery 31 is abnormal (Yes in S81), the control device 7 transmits a charge stop request to the rapid charger 200 via the CAN signal line 201b to stop the DC current output by the rapid charger 200, thereby stopping charging (S82). After S82, the control device 7 ends this process. The electric operating machine 1 of this embodiment provides the following advantages.

[0093] The electric working machine 1 of this embodiment includes an electric motor 9 (electric actuator), a battery unit 30 having a battery 31 that supplies power to the electric motor 9, a working device 20 that operates using the driving force of the electric motor 9, a charging port 41 (connection unit) that is connected to an external quick charger 200 via a charging cable 201, an operation unit 5c that sets charging parameters, and a control device 7 that changes the current value supplied from the quick charger 200 to the battery unit 30 according to the charging parameters set by the operation unit 5c. With this configuration, the battery 31 of the battery unit 30 can be charged with the current value of the quick charger 200 changed according to the charging parameters set by the operation unit 5c. That is, quick charging by the external quick charger 200 is not fixedly performed, but charging can be performed according to the charging parameters specified by the operator. Therefore, it is possible to set charging parameters that do not interfere with work after charging. Therefore, since the operator can appropriately set the charging parameters according to the state and usage mode of the electric working machine 1, it is possible to reduce the interference with work after charging in the electric working machine 1.

[0094] Furthermore, the operation unit 5c sets charging parameters to be instructed to the rapid charger 200, and the control device 7 outputs the charging parameters set by the operation unit 5c to the rapid charger 200. With this configuration, the battery 31 of the battery unit 30 can be charged by the rapid charger 200 using the charging parameters instructed from the electric work machine 1 to the external rapid charger 200.

[0095] The battery unit 30 further includes a display device 123, and the battery unit 30 includes a battery monitoring device 31b that monitors the state of the battery 31. The battery monitoring device 31b determines the allowable range of the charging parameters based on the state of the battery 31. The control device 7 causes the display device 123 to display the allowable range determined by the battery monitoring device 31b, and the operation unit 5c can set the charging parameters within the allowable range. According to this configuration, the allowable range of the charging parameters is displayed on the display device 123, so that the operator can set the charging parameters within the allowable range. Furthermore, if the charging parameters set by the operation unit 5c are within the allowable range, the charging parameters are output to the quick charger 200, and if they are not within the allowable range, the charging parameters are not output and a display is displayed on the display device 123 to prompt the operator to reset the charging parameters. Therefore, the charging parameters that are not within the allowable range are not output, and a display is displayed to prompt the operator to reset the charging parameters, so that the setting of inappropriate charging parameters can be eliminated.

[0096] The battery unit 30 also has a display device 123, and is equipped with a battery monitoring device 31b that monitors the state of the battery 31. The battery monitoring device 31b detects at least the temperature of the battery 31 as the state of the battery 31. The control device 7 displays the charging parameters set by the operation unit 5c and the temperature of the battery 31 detected by the battery monitoring device 31b on the display device 123, and the operation unit 5c is capable of changing the settings of the charging parameters. According to this configuration, the operator can change the charging parameters by looking at the temperature of the battery 31 displayed on the display device 123. When the charging parameters are changed, the quick charger 200 charges the battery 31 of the battery unit 30 according to the changed charging parameters, so that when the temperature of the battery 31 is high, the value of the charging parameters can be reduced to suppress an increase in the temperature of the battery 31. On the other hand, when the temperature of the battery 31 is low, the value of the charging parameters can be increased to shorten the charging time. In other words, the charging parameters can be appropriately changed in relation to the temperature of the battery 31.

[0097] Furthermore, when the temperature value of the battery 31 detected by the battery monitoring device 31b becomes equal to or higher than a set temperature that is set to a temperature lower than the use limit temperature of the battery 31, the control device 7 changes the charging parameters set in the operation unit 5c to changed charging parameters for making the temperature of the battery 31 lower than the set temperature. According to this configuration, the battery 31 is charged so that the temperature of the battery 31 becomes lower than the set temperature, so that the battery 31 can be prevented from becoming equal to or higher than the use limit temperature when the charging of the battery 31 is completed. Therefore, when the electric work machine 1 is used for work immediately after the charging is completed, it is possible to make it difficult for output adjustment due to high temperature to occur. In other words, the electric work machine 1 can be used sufficiently immediately after the charging of the battery 31 is completed. For example, in a general electric work machine, the battery 31 may become high temperature (use limit temperature) immediately after the charging of the battery 31 is completed due to rapid charging of the battery 31. If the battery 31 is high temperature immediately after the charging of the battery 31 is completed, the output of the electric motor 9 is adjusted, and the operation of the electric work machine is restricted or stopped, which causes a problem of impeding the work after charging. In contrast, the electric operating machine 1 of this embodiment can prevent such problems from occurring.

[0098] Furthermore, the battery monitoring device 31b calculates a predicted charging time, which is a time required to charge the battery 31 up to the target charging amount, using the target charging amount of the battery 31, the remaining capacity of the battery 31, the charging parameters set by the operation unit 5c, and the charging capacity per unit time, and the control device 7 causes the display device 123 to display the predicted charging time. According to this configuration, the operator can check the predicted charging time on the display device 123.

[0099] Furthermore, the battery monitoring device 31b determines whether or not charging of the battery 31 needs to be stopped based on at least one of the temperature, current, voltage, remaining capacity, and charging time of the battery 31, and when the battery monitoring device 31b determines that charging needs to be stopped, the control device 7 outputs a charging stop request to the rapid charger 200. With this configuration, charging by the rapid charger 200 can be stopped based on the result of monitoring the state of the battery 31 by the battery monitoring device 31b.

[0100] The electric actuator is an electric motor 9, and includes a hydraulic pump P1 driven by the electric motor 9 to discharge hydraulic oil, a hydraulic device M driven by the hydraulic oil from the hydraulic pump P1, and a working device 20 operated by the hydraulic device M, and the operation unit 5c is used to set the motor rotation speed of the electric motor 9 under normal circumstances, and is used to set charging parameters during charging other than under normal circumstances. With this configuration, the operation unit 5c that sets the motor rotation speed can also be used to set charging parameters, no additional parts are required, and an increase in the number of parts can be suppressed.

[0101] Furthermore, when the charging cable 201 is connected to the charging port 41, the control device 7 accepts an operation on the operation unit 5c as an operation for setting charging parameters, and when the charging cable 201 is removed from the charging port 41, the control device 7 accepts an operation on the operation unit 5c as an operation for setting the motor rotation speed of the electric motor 9. With this configuration, when the charging cable 201 is connected to the charging port 41, the charging parameters can be set on the operation unit 5c, so that the operation unit 5c can be easily switched to the charging parameter setting function. On the other hand, when the charging cable 201 is removed from the charging port 41, the motor rotation speed of the electric motor 9 can be set on the operation unit 5c, so that the operation unit 5c can be easily returned to its original function (the function for setting the motor rotation speed of the electric motor 9).

[0102] Moreover, the operation unit 5c is an operation switch 5c1 that sets the motor rotation speed of the electric motor 9 during normal charging, and the operation switch 5c1 is used to set charging parameters during charging other than normal charging. With this configuration, the operation switch 5c1 that sets the motor rotation speed can also be used to set charging parameters, making it unnecessary to use additional parts and suppressing an increase in the number of parts.

[0103] In this embodiment, the charging parameter set by the operation unit 5c is described as a current value, but is not limited thereto. For example, the charging parameter set by the operation unit 5c may include at least one of a current value, a charging time, a charging amount, and a charging speed. In this case, at least one of a current value, a charging time, a charging amount, and a charging speed (e.g., high speed, medium speed, low speed, etc.) can be set as the charging parameter, and the contents of the charging parameters (i.e., at least one of a current value, a charging time, a charging amount, and a charging speed) according to the needs of the operator can be selected, and the degree of freedom of operability can be improved.

[0104] <Variation 1> In the electric work machine 1 of the first modification, the control device 7 may be configured to accept an operation on the operation unit 5c as an operation for setting a charging parameter when the unloading valve 58 is in the shutoff position, and to accept an operation on the operation unit 5c as an operation for setting the motor rotation speed of the electric motor 9 when the unloading valve 58 is in the supply position. In other words, the control device 7 may not supply current from the quick charger 200 to the battery unit 30 when the unloading valve 58 is in the supply position.

[0105] According to the configuration of the first modified example, current can be supplied from the quick charger 200 to the battery unit 30 only when the unloading valve 58 is in the shutoff position. Specifically, when the unloading valve 58 is in the shutoff position, charging parameters can be set on the operation unit 5c, so that the operation unit 5c can be switched to a charging parameter setting function without any hassle. On the other hand, when the unloading valve 58 is in the supply position, the motor rotation speed of the electric motor 9 can be set on the operation unit 5c, so that the operation unit 5c can be easily returned to its original function (the function of setting the motor rotation speed of the electric motor 9).

[0106] <Variation 2> The electric work machine 1 of the second modified example may include a memory unit 7b that stores the motor rotation speed indicated by the operation switch 5c1 immediately before it becomes possible to set the charging parameters as a previous setting value, and the control device 7 may be configured to display the previous setting value stored in the memory unit 7b on the display device 123 when it becomes possible to set the motor rotation speed of the electric motor 9 with the operation switch 5c1. 3B, the control device 7 causes the display device 123 to display a level indicator LV1 indicating the immediately preceding setting value stored in the memory unit 7b. That is, it is displayed that the setting of the operation switch 5c1 when setting the motor speed of the electric motor 9 was at the level indicator LV1 position.

[0107] According to the configuration of variant example 2, when the operation switch 5c1 returns from the charging parameter setting function to the motor rotation speed setting function of the electric motor 9 (i.e., the original function), the original motor rotation speed setting value (previous setting value) can be notified to the operator, thereby supporting the operator when using the operation switch 5c1 in its original function.

[0108] <Modification 3> The electric working machine 1 of the third modification is shown in Fig. 8. Fig. 8 is an electrical block diagram of the electric working machine 1 of the third modification. In the electric working machine 1 of the third modification, the operation unit 5c is a display device 124 having a display panel 124a and a touch panel 124b located in front of the display panel 124a, and allows the motor rotation speed of the electric motor 9 to be set during normal charging, and allows charging parameters to be set during charging other than normal charging. For example, the display device 124 may be configured such that the display device 123 shown in Figs. 6A to 6D has a touch panel function and displays an image display corresponding to the operation switch 5c1. According to the electric operating machine 1 of the third modification, the display device 124 having a touch panel function can be used for setting charging parameters in addition to setting the motor rotation speed, and the electric operating machine 1 of the third modification has excellent operability.

[0109] <Modification 4> In the electric work machine 1 of the fourth modification, the control device 7 stops the power supply from the battery 31 to the electric motor 9 (electric actuator) while current is being supplied from the quick charger 200 to the battery unit 30. For example, when the charging cable 201 is connected to the charging port 41, the control device 7 causes the display device 123 to display a selection screen for selecting a charging mode, and when the charging mode is selected, stops the electric motor 9 and keeps the electric motor 9 stopped until the charging mode ends.

[0110] According to the electric working machine 1 of the fourth modification, safety during battery charging can be ensured. For example, when the charging cable 201 is connected to the charging port 41, the control device 7 causes the display device 123 to display a selection screen for selecting a charging mode, and when the charging mode is selected, the control device 7 stops the electric motor 9 and keeps the electric motor 9 stopped until the charging mode ends. In this case, after the electric motor 9 is stopped, charging of the battery 31 of the battery unit 30 starts, and in the charging mode, the electric motor 9 is kept stopped, so that the electric working machine 1 can be prevented from operating during charging, and safety during battery charging can be ensured.

[0111] Furthermore, in the above embodiment and modified example, the electric motor 9 is driven by the power from the batteries 31, 32, the hydraulic pumps P1, P2 are driven by the power of the electric motor 9, the hydraulic actuators C1-C5, the left travel motor ML, the right travel motor MR, and the swing motor MT are driven by the hydraulic oil discharged from the hydraulic pumps P1, P2, and the working device 20 and the traveling device 10 are driven by the power of the hydraulic actuators C1-C5, the left travel motor ML, the right travel motor MR, and the swing motor MT, but the present invention is not limited to this. For example, some or all of the actuators provided in the working device 20 and the traveling device 10 may be configured as electric actuators, and the electric actuators may be driven by the power of the batteries 31, 32, and the working device 20 and the traveling device 10 may be driven by the power of the electric actuators. For example, in addition to a configuration in which all the actuators are electric actuators, a configuration may be adopted in which at least one of an electric motor for driving a hydraulic pump and an electric swing motor is provided.

[0112] 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 the above description, and is intended to include all modifications within the scope and meaning equivalent to the claims. In the above-described embodiment and modified examples, an example has been described in which the present invention is applied to an electric work machine 1 such as a backhoe, but the application of the present invention is not limited to this, and the present invention may be applied to other construction machines such as wheel loaders, compact track loaders, and skid steer loaders, and may be applied to agricultural machines such as tractors, combines, rice transplanters, and lawn mowers. [Explanation of symbols]

[0113] 1 Electric work equipment 5b Unload lever 5c Control unit 5c1 Operation switch 7 Control Device 7b Storage section 9 Electric motor (electric actuator) 10 Travelling equipment (working equipment) 20 Working Equipment 30 Battery Unit 31 Battery 31b BMU (Battery Monitoring Unit) 32 Battery 32b BMU (Battery Monitoring Unit) 41 Charging port 58 Unloading valve 123 Display device 124 Display device 124a Display panel 124b Touch Panel 200 quick charger 201 Charging cable P1 Hydraulic Pump M Hydraulic Equipment

Claims

1. An electric motor; a battery unit having a battery for supplying power to the electric motor; a working device that operates using the driving force of the electric motor; A connection part that is connected to an external quick charger via a charging cable; an operation unit for setting charging parameters; a control device that changes a value of a current supplied from the rapid charger to the battery unit according to the charging parameters set by the operation unit; a hydraulic pump driven by the electric motor to discharge hydraulic oil; a hydraulic device driven by hydraulic fluid from the hydraulic pump; a working device operated by the hydraulic device, The operation unit is used to set the motor rotation speed of the electric motor under normal circumstances, and is used to set the charging parameters during charging other than under normal circumstances.

2. The operation unit sets the charging parameters to be instructed to the rapid charger, The electric operating machine according to claim 1 , wherein the control device outputs the charging parameters set by the operation unit to the quick charger.

3. A display device is provided, The battery unit includes a battery monitoring device that monitors a state of the battery, The battery monitoring device determines an acceptable range of the charging parameters based on a state of the battery; The control device causes the display device to display the allowable range determined by the battery monitoring device, The electric operating machine according to claim 1 or 2, wherein the operation unit is capable of setting the charging parameters within the allowable ranges.

4. A display device is provided, The battery unit includes a battery monitoring device that monitors a state of the battery, the battery monitoring device detects at least a temperature of the battery as a state of the battery; the control device causes the display device to display the charging parameters set by the operation unit and the temperature of the battery detected by the battery monitoring device; The electric operating machine according to any one of claims 1 to 3, wherein the operation unit is capable of changing settings of the charging parameters.

5. The electric work machine according to claim 4, wherein when the temperature value of the battery detected by the battery monitoring device becomes equal to or higher than a set temperature that is set to a temperature lower than the battery's usage limit temperature, the control device changes the charging parameters set in the operation unit to charging parameters for making the temperature of the battery lower than the set temperature.

6. the battery monitoring device calculates a predicted charging time, which is a time required to charge the battery up to the target charge amount, using a target charge amount of the battery, a remaining capacity of the battery, the charge parameters set by the operation unit, and a charge capacity per unit time; The electric operating machine according to any one of claims 3 to 5, wherein the control device causes the display device to display the predicted charging time.

7. The battery unit includes a battery monitoring device that monitors a state of the battery, the battery monitoring device determines whether or not charging of the battery needs to be stopped based on at least one of a temperature, a current, a voltage, a remaining capacity, and a charging time of the battery; The electric operating machine according to any one of claims 1 to 6, wherein the control device outputs a charging stop request to the rapid charger when the battery monitoring device determines that charging needs to be stopped.

8. The electric work machine according to claim 1, wherein, when the charging cable is connected to the connection portion, the control device accepts an operation on the operating unit as an operation for setting the charging parameters, and when the charging cable is disconnected from the connection portion, the control device accepts an operation on the operating unit as an operation for setting the motor rotation speed of the electric motor.

9. The electric operating machine according to any one of claims 1 to 8, wherein the control device stops the power supply from the battery to the electric motor while the current is being supplied from the quick charger to the battery unit.

10. An electric motor; a battery unit having a battery for supplying power to the electric motor; a working device that operates using the driving force of the electric motor; A connection part that is connected to an external quick charger via a charging cable; an operation unit for setting charging parameters; a control device that changes a value of a current supplied from the rapid charger to the battery unit according to the charging parameters set by the operation unit; a hydraulic pump driven by the electric motor to discharge hydraulic oil; a hydraulic device driven by hydraulic fluid from the hydraulic pump; A working device operated by the hydraulic device; and an unloading valve that can be switched between a supply position at which the hydraulic oil from the hydraulic pump is supplied to the hydraulic device and a cut-off position at which the hydraulic oil from the hydraulic pump is not supplied to the hydraulic device, The control device of the electric working machine does not supply current from the quick charger to the battery unit when the unload valve is in the supply position.

11. The electric operating machine according to any one of claims 1 to 10, wherein the charging parameters set by the operation unit include at least one of a current value, a charging time, a charging amount, and a charging speed.

12. An electric operating machine according to any one of claims 1 to 11, a quick charger that changes a value of a current supplied to the electric working machine via the charging cable in response to an instruction from the electric working machine.

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