Work machine, and management system of work machine

Abstract

To allow a user to grasp appropriate maintenance timing.SOLUTION: A work machine includes: an electric motor for driving a hydraulic pump; an energy storage device for supplying power to the electric motor; and a control device for outputting information related to execution of maintenance of the energy storage device based on charging history information including charging power when the energy storage device is charged, temperature of the energy storage device when charging was performed, and a charging time associated with at least one of the charging power and the temperature of the energy storage device.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a work machine and a management system for a work machine.

Background Art

[0002] Conventionally, techniques for performing maintenance on the battery of an electric work machine at an appropriate time are known. As an example, for instance, when the total of the charging time and the discharging time of the battery of an electric work machine reaches a specified value, a technique is known in which the fact that the specified value has been reached is displayed on a display unit to let an operator recognize the time for maintenance.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described conventional technology, the influence of the temperature of the battery during charging, the charging power, etc. on the deterioration of the battery is not considered. For this reason, in the above-described conventional technology, it is impossible to detect an appropriate time for maintenance according to the deterioration of the battery, and it is difficult to let an operator grasp an appropriate time for maintenance.

[0005] An object of the present disclosure is to enable an appropriate maintenance time to be grasped.

Means for Solving the Problems

[0006] The construction machine according to an embodiment of the present invention includes an electric motor for driving a hydraulic pump, a power storage device that supplies power to the electric motor, charging power in the charging performed on the power storage device, the temperature of the power storage device when charging is performed, and a charging time associated with at least one of the charging power or the temperature of the power storage device, and a control device that outputs information regarding the maintenance of the power storage device based on the charging history information.

[0007] A management system for a construction machine according to an embodiment of the present invention is a management system for a construction machine including a construction machine and a management device that manages the construction machine. The construction machine includes an electric motor for driving a hydraulic pump, a power storage device that supplies power to the electric motor, and a control device that outputs a notification instructing the implementation of maintenance of the power storage device based on charging history information indicating the history of charging performed on the power storage device.

Advantages of the Invention

[0008] It is possible to grasp an appropriate maintenance timing.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0010] (First Embodiment) The following describes this embodiment with reference to the drawings. FIG. 1 is a diagram showing an example of the system configuration of the work machine management system according to the first embodiment.

[0011] The work machine management system SYS of this embodiment includes an excavator 100, a management device 200, and a support device 300. In the work machine management system SYS, the excavator 100, the management device 200, and the support device 300 are connected via a network NW.

[0012] The excavator 100 is an example of a work machine. In the following description, the work machine management system SYS is simply referred to as the management system SYS.

[0013] In the management system SYS, the management device 200 may collect various data related to the excavator 100 transmitted (uploaded) from the excavator 100.

[0014] Further, the support device 300 may provide the user with data collected by the management device 200, secondary data (information) generated from the collected data, and the like. The users of the management system SYS include, for example, the users of the excavator 100 (hereinafter, "excavator users"). The excavator users include the operator of the excavator 100, the owner of the excavator 100, the service technician who performs maintenance on the excavator 100, and the like.

[0015] In addition, the users of the management system SYS include, for example, the users of the management device 200 (hereinafter referred to as "management device users"). The management device users include, for example, the administrators, operators, and developers of the excavator 100 of the management device 200. In addition, the users of the management system SYS include the users of the support device 300 (hereinafter referred to as "support device users"). The support device users include the operators of the excavator 100, the supervisors and operators at the work site, the administrators and operators of the management device 200, the service personnel in charge of the maintenance of the excavator 100, and the owners of the excavator 100.

[0016] In addition, the management system SYS may perform various settings related to the control of the excavator 100 in the management device 200 or the support device 300, for example, in response to an input from a user or automatically, and transmit them to the excavator 100. Thereby, various operations of the excavator 100 can be controlled and monitored from the management device 200 or the support device 300.

[0017] The excavator 100 included in the management system SYS may be one or a plurality of units. Thereby, the management system SYS can perform data collection, information provision to users based on the collected data, settings related to the control of the excavator 100, etc. for a plurality of excavators 100.

[0018] In addition, the management device 200 included in the management system SYS may be one or a plurality of units. Thereby, the management system SYS can distribute and realize various functions by a plurality of management devices 200.

[0019] In addition, the support device 300 included in the management system SYS may be one or a plurality of units. Thereby, the management system SYS can provide information about the excavator 100 to a plurality of users who use each of the plurality of support devices 300.

[0020] The excavator 100 of this embodiment includes a lower traveling body 1, an upper revolving body 3 mounted on the lower traveling body 1 so as to be rotatable (freely rotatable) via a slewing mechanism 2, an attachment AT, and a cabin 10 on which an operator rides.

[0021] The lower traveling body 1 includes, for example, a pair of left and right crawlers 1C (an example of a driven part). The lower traveling body 1 travels by itself when each crawler 1C is hydraulically driven by traveling hydraulic motors 1A and 1B (see FIG. 2).

[0022] The upper revolving body 3 (an example of a driven part) is hydraulically driven by a slewing hydraulic motor 2A (see FIG. 2) through the slewing mechanism 2. The attachment AT includes a boom 4, an arm 5, and a bucket 6.

[0023] The boom 4 (an example of a driven part) is attached to the center of the front part of the upper revolving body 3 so as to be able to pitch. At the tip of the boom 4, an arm 5 (an example of a driven part) is attached so as to be able to rotate up and down. At the tip of the arm 5, a bucket 6 (an example of a driven part) is attached so as to be able to rotate up and down. The boom 4, the arm 5, and the bucket 6 are each hydraulically driven by a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9 as hydraulic actuators.

[0024] The bucket 6 is an example of an end attachment and is used for excavation work, compaction work, etc.

[0025] Note that, at the tip of the arm 5, other end attachments may be attached instead of the bucket 6 according to the work content, etc. The other end attachments may be, for example, buckets of a different type from the bucket 6 such as a bucket for a slope or a bucket for dredging. Further, the other end attachments may be, for example, end attachments of a different type from the bucket such as a breaker, a stirrer, a grappler, etc. Also, an auxiliary attachment such as a quick coupling or a tilt rotator may be provided at the connection part between the end attachment including the bucket 6 and the arm 5.

[0026] In the excavator 100 of this embodiment, all driven parts are hydraulically driven by hydraulic oil supplied from a main pump 14 (see FIG. 2) that uses an electric motor 12 for the pump, which will be described later, as a power source. That is, in this embodiment, the excavator 100 corresponds to a configuration in which the prime mover (engine) of a so-called hydraulic excavator is replaced with the electric motor 12 for the pump.

[0027] Note that part or all of the driven parts of the excavator 100 may be electrically driven. For example, the upper swing body 3 may swing with respect to the lower traveling body 1 by being electrically driven by a swing electric motor through a swing mechanism 2.

[0028] Further, the excavator 100 of this embodiment includes a power storage device 19 that supplies power to the electric motor 12 for the pump, and a charging port 72 for connecting the power storage device 19 and an external commercial power supply. Details of the power storage device 19 and the charging port 72 will be described later.

[0029] Note that the position where the charging port 72 is provided is not limited to the example shown in FIG. 1. In the following description, there may be cases where it is expressed that the power storage device 19 and an external commercial power supply are connected and the power storage device 19 stores the power supplied from the external commercial power supply, which is charging the power storage device 19. Also, the external commercial power supply may be supplied from, for example, a charging stand or the like. In the following description, the external commercial power supply may be expressed as an external power supply.

[0030] The cab 10 is mounted, for example, on the front left side of the upper swing body 3, and inside it, there are provided a driver's seat on which an operator sits, an operation device 26, an air conditioner 80, a display device 40, etc., which will be described later.

[0031] Further, the excavator 100 of this embodiment includes a controller 30. The controller 30 serves as a main control unit that controls the operation of the excavator 100.

[0032] Furthermore, when charging the power storage device 19 in the controller 30 of the present embodiment, information including the charging method, the time taken for charging, and the temperature of the power storage device 19 during charging is collected and held as charging history information. Further, the controller 30 may cause the display device 40 to display the held charging history information.

[0033] Furthermore, the controller 30 transmits the charging history information to the management device 200. The management device 200 may cause the charging history information to be displayed on a display device included in the management device 200 or may cause it to be displayed on the support device 300.

[0034] In the following description, the time taken for one charge of the power storage device 19 is referred to as the charging time. One charge is the period from when the supply of an external commercial power source is started to the charging port 72 until the supply of the commercial power source is stopped.

[0035] Also, in the following description, the total charging time from when the power storage device 19 is mounted on the excavator 100 is referred to as the cumulative charging time.

[0036] The controller 30 of the present embodiment determines whether or not the cumulative charging time for the power storage device 19 is equal to or greater than a preset first threshold value, and when the cumulative charging time is equal to or greater than the first threshold value, causes the display device 40 to display a notification prompting the performance of maintenance on the power storage device 19.

[0037] In the present embodiment, in this way, the maintenance timing of the power storage device 19 of the excavator 100 is detected by referring to the charging history information of the power storage device 19 and is displayed on the display device 40. Therefore, according to the present embodiment, the user can be made aware of the appropriate maintenance timing of the power storage device 19.

[0038] Further, the excavator 100 operates driven parts such as the lower traveling body 1 (left and right crawlers 1C), the upper revolving body 3, the boom 4, the arm 5, and the bucket 6 in response to the operation of an operator boarding the cabin 10.

[0039] Alternatively, instead of being configured to be operable by an operator boarding the cab 10, or in addition thereto, the excavator 100 may be configured to be remotely operable from outside the excavator 100. When the excavator 100 is remotely operated, the inside of the cab 10 may be unmanned. Hereinafter, the description will proceed on the premise that the operation by the operator includes at least one of the operation on the operating device 26 of the operator in the cab 10 and the remote operation by an external operator.

[0040] Remote operation includes, for example, a mode in which the excavator 100 is operated by an operation input regarding an actuator of the excavator 100 performed by a predetermined external device. The external device includes, for example, the management device 200 and the support device 300.

[0041] The same may apply to the remote monitoring described later. In this case, the excavator 100 is equipped with a communication device capable of communicating with the external device, and may transmit, for example, an image (hereinafter, "surrounding image") representing the state of the surroundings of the excavator 100 based on the image information (captured image) output by the camera included in the surrounding information acquisition device 50 described later to the external device.

[0042] The surrounding information acquisition device 50 as the camera in the present embodiment includes a front camera 50F that captures the space in front of the excavator 100, a left camera 50L that captures the space to the left of the excavator 100, a right camera 50R that captures the space to the right of the excavator 100, and a rear camera 50B that captures the space behind the excavator 100.

[0043] The surrounding information acquisition device 50 as the camera is, for example, a monocular camera having an image sensor such as a CCD or a CMOS, and outputs the captured image to the display device 40. Further, the surrounding information acquisition device 50 as the camera may be a stereo camera, a distance image camera, or the like. Further, the surrounding information acquisition device 50 as the camera may be replaced with another space recognition device (object detection device) such as a three-dimensional distance image sensor, an ultrasonic sensor, a millimeter-wave radar, a LIDAR, or an infrared sensor, or may be replaced with a combination of another space recognition device and a camera.

[0044] The front camera 50F is attached, for example, to the ceiling of the cab 10, i.e., inside the cab 10. However, the front camera 50F may be attached outside the cab 10, such as to the roof of the cab 10 or the side surface of the boom 4. The left camera 50L is attached to the left end of the upper surface of the upper swing body 3, the right camera 50R is attached to the right end of the upper surface of the upper swing body 3, and the rear camera 50B is attached to the rear end of the upper surface of the upper swing body 3.

[0045] Note that the peripheral information acquisition device 50 outputs information regarding the situation of the three-dimensional space around the excavator 100. The peripheral information acquisition device 50 may include, for example, an ultrasonic sensor, a millimeter-wave radar, a monocular camera, a stereo camera, a depth camera, a LIDAR (Light Detection and Ranging), a distance image sensor, an infrared sensor, etc. The output information of the peripheral information acquisition device 50 is taken into the controller 30.

[0046] Then, the external device may cause a display device provided in the external device (hereinafter, "remote operation display device") to display the peripheral image of the excavator 100 received. Also, various information images (information screens) displayed on the display device 40 inside the cab 10 of the excavator 100 may similarly be displayed on the remote operation display device of the external device. Thereby, an operator of the external device can remotely operate the excavator 100 while checking the display contents such as the peripheral image and the information screen of the excavator 100 displayed on the remote operation display device.

[0047] Then, the excavator 100 may operate the actuator in response to a remote operation signal received from the external device by the communication device, which represents the content of the remote operation, and drive driven parts such as the lower traveling body 1, the upper swing body 3, the boom 4, the arm 5, and the bucket 6.

[0048] Further, remote operation may include a mode in which the excavator 100 is operated, for example, by external voice input or gesture input to the excavator 100 from people (such as operators) around the excavator 100. Specifically, the excavator 100 recognizes voices spoken by surrounding workers or gestures made by workers through a voice input device (such as a microphone) or a gesture input device (such as a camera) mounted on the excavator 100 (the own machine). Then, the excavator 100 may operate the actuator according to the recognized voice or gesture content, and drive driven parts such as the lower traveling body, the upper swing body 3, the boom 4, the arm 5, and the bucket 6.

[0049] Further, the excavator 100 may automatically operate the actuator regardless of the content of the operator's operation. Thereby, the excavator 100 realizes a function (so-called "automatic driving function" or "MC (Machine Control) function") of automatically operating at least a part of the driven parts such as the lower traveling body 1, the upper swing body 3, the boom 4, the arm 5, and the bucket 6.

[0050] The automatic driving function may include a function (so-called "semi-automatic driving function" or "operation support type MC function") of automatically operating driven parts (actuators) other than the driven part (actuator) of the operation target according to an operation on the operator's operation device 26 or a remote operation. Further, the automatic driving function may include a function (so-called "fully automatic driving function" or "fully automatic type MC function") of automatically operating at least a part of a plurality of driven parts (actuators) on the premise that there is no operation on the operator's operation device 26 or remote operation.

[0051] In the excavator 100, when the fully automatic operation function is enabled, the inside of the cab 10 may be unmanned. Also, for the semi-automatic operation function, the fully automatic operation function, etc., an aspect may be included in which the operation content of the driven part (actuator) of the object of automatic operation is automatically determined according to a rule defined in advance. Further, for the semi-automatic operation function, the fully automatic operation function, etc., an aspect (so-called "autonomous operation function") may be included in which the excavator 100 autonomously makes various determinations and, in accordance with the determination results, the operation content of the driven part (actuator) of the object of automatic operation is determined autonomously.

[0052] Also, when the excavator 100 operates with an automatic operation function (especially the fully automatic operation function), the working status of the excavator 100 may be remotely monitored from outside the excavator 100. When remote monitoring is performed, the external device may also display on the remote monitoring display device of the external device various information images (information screens) displayed on the display device 40 inside the cab 10 of the excavator 100.

[0053] Thereby, the monitor of the external device can remotely monitor the working status of the excavator 100 while checking the display content such as the surrounding image and information screen of the excavator 100 displayed on the remote monitoring display device. Also, for example, when there is some problem with the working status of the excavator 100, the monitor of the external device may be able to perform a predetermined input to the external device to cause the excavator 100 to make an emergency stop or perform an intervention operation on the excavator 100.

[0054] In this case, the excavator 100 may cause the driven parts such as the lower traveling body 1, the upper slewing body 3, the boom 4, the arm 5, and the bucket 6 to make an emergency stop by stopping the actuator in response to a signal indicating an emergency stop received from the external device through the communication device. Also, the excavator 100 may realize an intervention operation on the driven parts such as the lower traveling body 1, the upper slewing body 3, the boom 4, the arm 5, and the bucket 6 by operating the actuator in response to a signal representing the content of the intervention operation received from the external device through the communication device.

[0055] Next, referring to FIG. 2, other configurations of the excavator 100 will be described. FIG. 2 is a block diagram schematically showing the configuration of the excavator. In FIG. 2, the mechanical power transmission system is represented by a double line, the relatively high hydraulic pressure transmission system, i.e., the hydraulic oil line of the hydraulic drive system, is represented by a thick solid line, the pilot pressure transmission system, i.e., the hydraulic oil line of the operation system, is represented by a dashed line, and the power and electrical signal transmission systems are represented by thin solid lines, respectively.

[0056] The excavator 100 includes respective components such as a hydraulic drive system, an electric drive system, a power supply system, an operation system, a cooling system, a user interface system, a comfort equipment system, and a control system.

[0057] The hydraulic drive system of the excavator 100 is a group of components related to the hydraulic drive of the driven parts. The hydraulic drive system of the excavator 100 includes hydraulic actuators such as travel hydraulic motors 1A, 1B that hydraulically drive the respective driven parts such as the lower traveling body 1, the boom 4, the arm 5, and the bucket 6, the boom cylinder 7, the arm cylinder 8, and the bucket cylinder 9. Further, the hydraulic drive system of the excavator 100 includes a pump motor 12, a main pump 14, and a control valve 17.

[0058] The pump motor 12 (an example of a motor) is a power source of the hydraulic drive system. The pump motor 12 is, for example, an IPM (Interior Permanent Magnet) motor. The pump motor 12 is connected to the power storage device 19 via the inverter 18. The pump motor 12 performs power running with three-phase AC power supplied from the power storage device 19 via the inverter 18, and drives the main pump 14 and the pilot pump 15. The drive control of the pump motor 12 may be executed by the inverter 18 under the control of a controller 30 described later.

[0059] The main pump 14 (a hydraulic pump, an example of a first hydraulic pump) sucks hydraulic oil from the hydraulic oil tank T and discharges it into the high-pressure hydraulic line 16, thereby supplying hydraulic oil to the control valve 17 through the high-pressure hydraulic line 16. As described above, the main pump 14 is driven by the pump motor 12. The main pump 14 is, for example, a variable displacement hydraulic pump, and under the control of a controller 30 described later, a regulator (not shown) controls the angle of the swash plate (tilt angle). Thereby, the main pump 14 can adjust the stroke length of the piston and the discharge flow rate (discharge pressure).

[0060] The control valve 17 controls the hydraulic drive system according to an operation of an operator or an operation command corresponding to an automatic operation function. As described above, the control valve 17 is connected to the main pump 14 via the high-pressure hydraulic line 16, and is configured to selectively supply the hydraulic oil supplied from the main pump 14 to a plurality of hydraulic actuators. For example, the control valve 17 is a valve unit including a plurality of control valves (direction switching valves) that control the flow rate and flow direction of the hydraulic oil supplied from the main pump 14 to each of the hydraulic actuators. The hydraulic oil supplied from the main pump 14 and flowing through the control valve 17 and the hydraulic actuator is discharged from the control valve 17 to the hydraulic oil tank T.

[0061] The electric drive system of the excavator 100 is a group of components related to the electric drive of the prime mover (power source) and the driven parts of the excavator 100.

[0062] As shown in the figure, the electric drive system of the excavator 100 includes a pump motor 12, a sensor 12s, and an inverter 18.

[0063] Note that, as described above, when a part or all of the driven parts of the excavator 100 are electrically driven, the electric drive system of the excavator 100 may include an electric actuator that drives the driven part, an inverter that drives the electric actuator, and the like.

[0064] The sensor 12s includes a current sensor 12s1, a voltage sensor 12s2, and a rotation state sensor 12s3.

[0065] The current sensor 12s1 detects the current of each of the three phases (U phase, V phase, and W phase) of the pump motor 12. The current sensor 12s1 is provided, for example, in the power path between the pump motor 12 and the inverter 18. The detection signal corresponding to the current of each of the three phases of the pump motor 12 detected by the current sensor 12s1 is directly taken into the inverter 18 through the communication line. Further, the detection signal may be taken into the controller 30 through the communication line and input into the inverter 18 via the controller 30.

[0066] The voltage sensor 12s2 detects the applied voltage of each of the three phases of the pump motor 12. The voltage sensor 12s2 is provided, for example, in the power path between the pump motor 12 and the inverter 18. The detection signal corresponding to the applied voltage of each of the three phases of the pump motor 12 detected by the voltage sensor 12s2 is directly taken into the inverter 18 through the communication line. Further, the detection signal may be taken into the controller 30 through the communication line and input into the inverter 18 via the controller 30.

[0067] The rotation state sensor 12s3 detects the rotation state of the pump motor 12. The rotation state of the pump motor 12 includes, for example, the rotation position (rotation angle), the rotation speed, and the like. The rotation state sensor 12s3 is, for example, a rotary encoder or a resolver. The detection signal corresponding to the rotation state of the pump motor 12 detected by the rotation state sensor 12s3 is directly taken into the inverter 18 through the communication line. Further, the detection signal may be taken into the controller 30 through the communication line and input into the inverter 18 via the controller 30.

[0068] The inverter 18 drives and controls the pump motor 12 under the control of the controller 30. The inverter 18 includes, for example, a conversion circuit that converts DC power into three-phase AC power or converts three-phase AC power into DC power, a drive circuit that drives the conversion circuit by switching, and a control circuit that outputs a control signal that defines the operation of the drive circuit. The control signal is, for example, a PWM (Pulse Width Modulation) signal.

[0069] The control circuit of the inverter 18 performs drive control of the pump motor 12 while grasping the operating state of the pump motor 12. For example, the control circuit of the inverter 18 grasps the operating state of the pump motor 12 based on the detection signal of the rotation state sensor 12s3. Further, the control circuit of the inverter 18 may grasp the operating state of the pump motor 12 by sequentially estimating the rotation angle of the rotation shaft of the pump motor 12 or the like based on the detection signal of the current sensor 12s1 and the detection signal of the voltage sensor 12s2 (or the voltage command value generated in the control process).

[0070] Note that at least one of the drive circuit and the control circuit of the inverter 18 may be provided outside the inverter 18.

[0071] The power supply system of the excavator 100 is a group of components for supplying power to various electrical devices.

[0072] As shown in FIG. 2, the power supply system of the excavator 100 includes a power storage device 19, a DC-DC converter 44, a battery 46, an in-vehicle charger 70, and a charging port 72.

[0073] The power storage device 19 is an energy source for driving the actuator of the excavator 100. The power storage device 19 is charged (stores electricity) by being connected to an external commercial power supply with a predetermined cable (hereinafter, "charging cable"), and supplies the charged power to the pump motor 12. The power storage device 19 is, for example, a lithium-ion battery and has a relatively high output voltage (for example, several hundred volts).

[0074] Further, the power storage device 19 may include a plurality of power storage modules each configured by connecting a plurality of battery cells in series.

[0075] Note that a power conversion device may be provided between the power storage device 19 and the pump motor 12 to boost the output voltage of the power storage device 19 and apply it to the pump motor 12. Also, as described above, when a part or all of the driven part is electrically driven, instead of or in addition to the pump motor 12, the power of the power storage device 19 is supplied to an electric actuator that electrically drives the driven part.

[0076] Further, the power storage device 19 incorporates a temperature detection unit 19a for detecting the temperature of the power storage device 19. The temperature detection unit 19a may be realized by a temperature sensor that transmits the detected temperature of the power storage device 19 to the controller 30.

[0077] Also, the power storage device 19 of the present embodiment may incorporate a memory that holds an index (SOH; State of Health) indicating the deterioration state of the power storage device 19 and a control device for managing the power storage device 19. In this case, the control device of the power storage device 19 may transmit the index held in the memory and the temperature detected by the temperature detection unit 19a to the controller 30. The controller 30 may include an index indicating the deterioration state of the power storage device 19 in the charge history information of the power storage device 19. Note that the index indicating the deterioration state of the power storage device 19 is an example of information regarding the implementation of maintenance.

[0078] The DC-DC converter 44 (an example of a power conversion device) is provided, for example, on the upper swing body 3, and steps down and outputs the very high voltage DC power output from the power storage device 19 to a predetermined voltage (for example, about 24 volts). The output power of the DC-DC converter 44 is supplied to the battery 46 for charging (power storage) or to electric devices (hereinafter, "low voltage devices") driven by the power of the battery 46. The low voltage devices include, for example, the controller 30. Also, the low voltage devices include, for example, the water pump 64, the air conditioner 80, the fan 90, and the like.

[0079] For example, as shown in FIG. 2, the excavator 100 is equipped with one DC-DC converter 44. Note that the excavator 100 may be equipped with a plurality of DC-DC converters 44.

[0080] Also, the DC-DC converter 44 may be replaced by an alternator. In this case, the alternator may be provided on the upper swing body 3 and generate electricity by the power of the pump motor 12. The generated power of the alternator is supplied to the battery 46 and charged (stored) in the battery 46, or supplied to low-voltage devices such as the controller 30, similar to the case of the DC-DC converter 44.

[0081] The battery 46 is provided on the upper swing body 3 and has a relatively low output voltage (e.g., 24 volts). The battery 46 supplies power to low-voltage devices other than the electric drive system that require relatively high power. The battery 46 is, for example, a lead-acid battery, a lithium-ion battery, etc., and is charged by the output power of the DC-DC converter 44.

[0082] The in-vehicle charger 70 charges the power storage device 19 by converting the single-phase AC power of the voltage supplied from an external power source into DC power through the charging port 72 and outputting it to the power storage device 19.

[0083] The charging port 72 is provided, for example, on the side surface of the upper swing body 3 or the like, and is connected to an external power source when the tip of a charging cable extending from the external power source is inserted. The charging port 72 includes charging ports 72A and 72B.

[0084] The charging port 72A is configured to be connectable to a charging cable extending from an external power source (e.g., a commercial power source) that can supply single-phase AC power at a relatively low voltage (e.g., 200 [V]). The charging port 72A is connected to the in-vehicle charger 70 by a power line (wire harness), and the power supplied from the external power source is supplied to the power storage device 19 through the in-vehicle charger 70. Thereby, so-called normal charging of the power storage device 19 is realized.

[0085] In this embodiment, the charging power per unit time during normal charging may be 6 [kW] or less.

[0086] To the charging port 72B, for example, a charging cable extending from an external power source capable of supplying DC power at a relatively high voltage (for example, 400 [V]) is connected. The charging port 72B is directly connected to the power storage device 19 by a power line (wire harness), and directly supplies the DC power supplied from the external power source to the power storage device 19. Thereby, so-called rapid charging of the power storage device 19 is realized.

[0087] In this embodiment, the charging power per unit time during rapid charging may be 50 [kW] or more and less than 100 [kW].

[0088] Also, in this embodiment, when a charging cable extending from an external power source capable of supplying DC power at a relatively higher voltage is connected to the charging port 72B and the DC power supplied from the external power source is directly applied to the power storage device 19, ultra-rapid charging of the power storage device 19 is realized.

[0089] In this embodiment, the charging power per unit time during ultra-rapid charging may be 100 [kW] or more and less than 200 [kW].

[0090] Each of normal charging, rapid charging, and ultra-rapid charging in this embodiment is an example of a charging method for the power storage device 19.

[0091] The operating system of the excavator 100 is a group of components related to the operation of the driven part. As shown in FIG. 2, the operating system of the excavator 100 includes a pilot pump 15, an operating device 26, and a hydraulic control valve 31.

[0092] The pilot pump 15 supplies pilot pressure to various hydraulic devices (for example, the hydraulic control valve 31) mounted on the excavator 100 via the pilot line 25. Thereby, the hydraulic control valve 31 can supply a pilot pressure corresponding to the operation content (for example, the operation amount and the operation direction) of the operating device 26 to the control valve 17 under the control of the controller 30.

[0093] Therefore, the controller 30 and the hydraulic control valve 31 can realize the operation of the driven part (hydraulic actuator) according to the operation content of the operator on the operation device 26. Further, the hydraulic control valve 31 can supply a pilot pressure corresponding to the content of the remote operation specified by the remote operation signal to the control valve 17 under the control of the controller 30. Also, the hydraulic control valve 31 can supply a pilot pressure corresponding to the operation command corresponding to the automatic operation function to the control valve 17 under the control of the controller 30. The pilot pump 15 is, for example, a fixed displacement hydraulic pump and is driven by the pump motor 12 as described above.

[0094] Note that the pilot pump 15 may be omitted. In this case, the hydraulic oil discharged from the main pump 14 and reduced to a predetermined pilot pressure through a pressure reducing valve or the like may be supplied to various hydraulic devices such as the hydraulic control valve 31.

[0095] The operation device 26 is provided within reach of the operator in the cab 10 and is used for the operator to operate each driven part (that is, the left and right crawlers 1C of the lower traveling body 1, the upper swing body 3, the boom 4, the arm 5, and the bucket 6, etc.). In other words, the operation device 26 is used for the operator to operate the actuators (for example, the traveling hydraulic motors 1A, 1B, the boom cylinder 7, the arm cylinder 8, and the bucket cylinder 9, etc.) that drive each driven part. For example, as shown in FIG. 2, the operation device 26 is electric and outputs an electric signal (hereinafter, "operation signal") corresponding to the operation content by the operator. The operation signal output from the operation device 26 is taken into the controller 30. Thereby, the controller 30 can control the hydraulic control valve 31 and the like, and control the operation of the driven part (actuator) of the excavator 100 according to the operation content of the operator and the operation command corresponding to the automatic operation function.

[0096] In addition, when the control valve 17 is composed of an electromagnetic pilot-operated hydraulic control valve (direction switching valve), the operation signal of the electric operating device 26 may be directly input to the control valve 17, and each hydraulic control valve may operate according to the operation content of the operating device 26. Further, the operating device 26 may be a hydraulic pilot type that outputs a pilot pressure according to the operation content. In this case, the pilot pressure according to the operation content is supplied to the control valve 17.

[0097] The hydraulic control valve 31 outputs a predetermined pilot pressure under the control of the controller 30 by using the hydraulic oil supplied from the pilot pump 15 through the pilot line 25. The pilot line on the secondary side of the hydraulic control valve 31 is connected to the control valve 17, and the pilot pressure output from the hydraulic control valve 31 is supplied to the control valve 17.

[0098] The user interface system of the excavator 100 is a group of components related to the information exchange between the user and the excavator.

[0099] As shown in FIG. 2, the user interface system includes a display device 40 and an input device 52.

[0100] The display device 40 may display various information images under the control of the controller 30. The display device 40 is, for example, a liquid crystal display, an organic EL (Electroluminescence) display, or the like.

[0101] Note that the display device 40 is an example of an output device that outputs various notifications. The output device includes, for example, an illumination device that outputs (notifies) information to the user in a visual manner. The illumination device is, for example, a warning light or the like.

[0102] The output device may include an output device that is provided outside the cab 10 under the control of the controller 30 and outputs various information to users around the excavator 100 (for example, workers or supervisors around the excavator 100).

[0103] In addition, the output device includes, for example, a sound output device that outputs information to the user in an auditory manner. The sound output device is, for example, a buzzer, a speaker, or the like.

[0104] The input device 52 receives various inputs from the user. For example, the input device 52 includes an input device provided inside the cabin 10 that receives various inputs from a user (e.g., an operator) inside the cabin 10. Also, for example, the input device 52 may include an input device provided outside the cabin 10 that receives various inputs from a user (e.g., a worker or supervisor around the excavator 100) outside the cabin 10.

[0105] The input device 52 may include, for example, an operation input device that receives an operation input from the user. The operation input device includes, for example, buttons, toggles, levers, touch panels, touch pads, and the like. Also, the input device 52 may include, for example, a voice input device that receives a voice input from the operator or a gesture input device that receives a gesture input from the operator. The voice input device includes, for example, a microphone that acquires the user's voice. Also, the gesture input device includes, for example, a camera that can image the state of the user's gesture. A signal corresponding to the input from the operator received by the input device 52 is taken into the controller 30.

[0106] The comfort equipment system of the excavator 100 is a group of components related to the comfort equipment of a user (operator) inside the cabin 10.

[0107] The comfort equipment system of the excavator 100 includes an air conditioner 80. Also, the comfort equipment system of the excavator 100 includes a fan 90.

[0108] The air conditioner 80 (an example of an electrical load) adjusts the state of the air inside the cabin 10, specifically, the temperature, humidity, etc. of the air. The air conditioner 80 operates, for example, with electric power supplied from the DC-DC converter 44 and the battery 46.

[0109] The fan 90 can blow air, for example, toward the capacitor of the excavator 100 to cool or heat the capacitor. As a result, air capable of performing heat exchange with the refrigerant flowing through the interior is sequentially supplied around the capacitor, and the degree of cooling or heating of the refrigerant by the capacitor 82B can be increased.

[0110] The control system of the excavator 100 is a group of components related to various controls of the excavator 100. As shown in FIG. 2, the control system of the excavator 100 includes a controller 30. The control system of the excavator 100 also includes a peripheral information acquisition device 50, a sensor 48, and temperature sensors 54 and 56. Note that the functions of the controller 30 may be realized in a distributed manner by two or more controllers.

[0111] The controller 30 is mainly configured by a computer including a CPU (Central Processing Unit), a memory device such as a RAM (Random Access Memory), an auxiliary storage device such as a ROM (Read Only Memory), and an interface device with the outside. The controller 30 realizes various functions, for example, by loading a program installed in the auxiliary storage device into the memory device and executing it on the CPU.

[0112] The controller 30 outputs a control command to the hydraulic control valve 31, for example, according to an operation signal input from the operation device 26, and causes the hydraulic control valve 31 to output a pilot pressure corresponding to the operation content of the operation device 26. Thereby, the controller 30 can realize the operation of the driven part (hydraulic actuator) of the excavator 100 corresponding to the operation content of the electric operation device 26.

[0113] When the excavator 100 is remotely operated, the controller 30 may perform control related to remote operation, for example. Specifically, the controller 30 may output a control command to the hydraulic control valve 31 and cause the hydraulic control valve 31 to output a pilot pressure corresponding to the content of the remote operation. Thereby, the controller 30 can realize the operation of the driven part (hydraulic actuator) of the excavator 100 corresponding to the content of the remote operation.

[0114] Also, the controller 30 may perform control related to the automatic operation function, for example. Specifically, the controller 30 may output a control command to the hydraulic control valve 31 and cause the pilot pressure corresponding to the operation command corresponding to the automatic operation function to act from the hydraulic control valve 31 on the control valve 17. Thereby, the controller 30 can realize the operation of the driven part (hydraulic actuator) of the excavator 100 corresponding to the automatic operation function.

[0115] Furthermore, the controller 30 performs control related to the electric drive system based on various input information (for example, a control command including an operation signal of the operation device 26).

[0116] The controller 30 outputs a control command to the inverter 18, for example, and performs drive control of the pump motor 12.

[0117] When a power conversion device is provided between the power storage device 19 and the pump motor 12 as described above, the controller 30 may output a control command to the power conversion device and perform control related to the operation of the power conversion device, for example.

[0118] Furthermore, the controller 30 performs control related to the peripheral monitoring function of the excavator 100.

[0119] The controller 30 detects a predetermined object (hereinafter, "monitored object") around the excavator 100 or estimates the position of the monitored object based on, for example, data regarding the situation of the three-dimensional space around the excavator 100, which is captured from the peripheral information acquisition device 50. The monitored object includes, for example, a person. The monitored object also includes, for example, other work vehicles, other work machines, etc. The monitored object may also include, for example, utility poles, pylons, fences, on-site materials, etc. The data regarding the situation of the three-dimensional space around the excavator 100 includes, for example, detection data regarding the objects around the excavator 100 and their positions.

[0120] Further, when the controller 30 detects a monitored object within a predetermined monitoring range, for example, it outputs an alarm to the user in the cab 10 or to the surroundings of the excavator 100 through an output device (for example, a display device 40, a sound output device, etc.). The monitoring range is appropriately set, for example, as a range relatively close to the excavator 100 around the excavator 100.

[0121] Also, when the controller 30 detects a monitored object within a predetermined monitoring range, for example, it may limit the operation of the driven part (actuator) of the excavator 100.

[0122] The limitation of the operation of the driven part includes, for example, stopping the operation of the driven part. The controller 30 may forcibly stop the operation of the driven part (hydraulic actuator) by invalidating, for example, the operation or operation command of the operator.

[0123] Also, the limitation of the operation of the driven part includes, for example, decelerating the operation of the driven part. The controller 30 may relatively reduce the pilot pressure output from the hydraulic control valve 31 to the control valve 17 and decelerate the operation of the driven part (hydraulic actuator) with respect to the operation or operation command of the operator.

[0124] Furthermore, the controller 30 performs control regarding the power storage device 19. The controller 30 performs control regarding, for example, the charging of the power storage device 19.

[0125] The controller 30 monitors various states of the power storage device 19 (for example, current state, voltage state, temperature state, charge state, deterioration state, presence or absence of abnormality, etc.) based on the outputs of various sensors incorporated in the power storage device 19.

[0126] The controller 30 further controls the DC-DC converter 44. The controller 30 controls the operation of the DC-DC converter 44.

[0127] The controller 30 monitors various states of the DC-DC converter 44 (for example, current state, voltage state, temperature state, etc.).

[0128] The sensor 48 measures the state of the power supplied from the DC-DC converter 44 or the battery 46 to the low-voltage load. For example, the sensor 48 may include a current sensor that measures the current supplied from the DC-DC converter 44 or the battery 46 to the low-voltage load and a voltage sensor that measures the voltage.

[0129] The temperature sensor 54 measures (detects) the temperature of the equipment of the electric drive system to be cooled. The temperature sensor 54 includes, for example, a temperature sensor that detects the temperature of the pump motor 12. The temperature sensor 54 also includes a temperature sensor that detects the temperature of the inverter 18. The temperature sensor 54 also includes, for example, a temperature sensor that detects the temperature of the power storage device 19. The temperature sensor 54 also includes, for example, a temperature sensor that detects the temperature of the DC-DC converter 44. The temperature sensor 54 also includes, for example, a temperature sensor that detects the temperature of the in-vehicle charger 70. The detection signal of the temperature sensor 54 is taken into the controller 30, for example. Thereby, the controller 30 can grasp the temperature state of the equipment of the electric drive system.

[0130] When a power conversion device is provided between the power storage device 19 and the pump motor 12, the temperature sensor may include a temperature sensor that grasps the temperature state of the power conversion device.

[0131] The temperature sensor 56 measures (detects) the indoor temperature of the cabin 10. The detection signal of the temperature sensor 56 is taken into, for example, the controller 30. Thereby, the controller 30 can grasp the temperature state inside the cabin 10.

[0132] Next, the functions of the controller 30 of the present embodiment will be described. The controller 30 of the present embodiment includes a charge detection unit 30A, a charge history acquisition unit 30B, a determination unit 30C, a display control unit 30D, and a charge history storage unit 30E.

[0133] The charge detection unit 30A detects that a charging cable is inserted into the charging port 72 and that the charging cable is pulled out from the charging port 72. In other words, the charge detection unit 30A detects that one charging has been performed.

[0134] Each time one charging is performed, the charge history acquisition unit 30B acquires charge history information indicating the charge history and stores it in the charge history storage unit 30E. Details of the charge history information will be described later.

[0135] When the controller 30 of the excavator 100 is activated, the determination unit 30C refers to the charge history information stored in the charge history storage unit 30E and determines whether to issue a notification prompting the implementation of maintenance of the power storage device 19. Details of the determination unit 30C will be described later.

[0136] The display control unit 30D controls the display of the display device 40. More specifically, when it is determined that a notification prompting the implementation of maintenance of the power storage device 19 is to be issued, the display control unit 30D causes the display device 40 to display that notification. Further, the display control unit 30D causes the display device 40 to display the charge history information stored in the charge history storage unit 30E. The charge history storage unit 30E stores the charge history information acquired by the charge history acquisition unit 30B.

[0137] Next, with reference to FIG. 3, the charge history information of the present embodiment will be described. FIG. 3 is a diagram showing an example of the charge history information.

[0138] The charging history information of this embodiment includes, as information items, a temperature range, a charging method, a charging time, and a charging power per unit time, each of which is associated with each other. In other words, the charging history information is information in which the cumulative charging time indicating the total charging time since the power storage device 19 was mounted on the excavator 100 is associated with at least one of the charging power range including the charging power when charging is performed and the temperature range including the temperature of the power storage device 19 when charging is performed.

[0139] In the example of FIG. 3, the temperature range of the power storage device 19 is set to 20°C or more and less than 30°C, 30°C or more and less than 40°C, 40°C or more and less than 50°C, and 50°C or more. Also, in the following description, when the temperature of the power storage device 19 is 40°C or more, it is determined that the state of the power storage device 19 is in a high-temperature state. The state where the power storage device 19 is in a high-temperature state means a state in which the deterioration of the power storage device 19 is promoted.

[0140] Also, in the example of FIG. 3, the charging power range of the charging method "normal charging" is set to "6 kW or less", the charging power range of the charging method "rapid charging" is set to "50 kW or more and less than 100 kW", and the charging power range of the charging method "ultra-rapid charging" is set to "100 kW or more and less than 200 kW".

[0141] In the example of FIG. 3, it can be seen that when the temperature of the power storage device 19 is less than 20°C, the cumulative charging time during which the power storage device 19 is charged by the charging method "normal charging" is 1000 [hr], and when the temperature of the power storage device 19 is 40°C or more and less than 50°C, the cumulative charging time during which it is ultra-rapidly charged with a charging power of "100 kW or more and less than 110 kW" is 50 [hr].

[0142] Also, the charging history information includes, for each charging power, the total cumulative charging time obtained by summing the cumulative charging times corresponding to each temperature range. In FIG. 3, for example, it can be seen that the total cumulative charging time obtained by summing the cumulative charging times corresponding to each temperature range at a charging power of "6 kW or less" is "3500 hr".

[0143] Note that each of the temperature range and the charging power range shown in FIG. 3 is an example, and the temperature range and the charging power range are not limited thereto.

[0144] Rapid charging is a charging method that accelerates the deterioration of the power storage device 19 compared to normal charging, and ultra-rapid charging is a charging method that accelerates the deterioration of the power storage device 19 compared to rapid charging.

[0145] Next, with reference to FIG. 4, the processing of the controller 30 of the excavator 100 will be described. FIG. 4 is a flowchart for explaining the operation of the excavator according to the first embodiment. In FIG. 4, the processing of the determination unit 30C of the controller 30 is shown.

[0146] The controller 30 of the excavator 100 determines whether the excavator 100 has been started (step S401). Specifically, the controller 30 determines whether the excavator 100 has been keyed on. In step S401, if the excavator 100 is not started, it waits.

[0147] In step S401, when the excavator 100 is started, the determination unit 30C of the controller 30 refers to the charging history information stored in the charging history storage unit 30E (step S402).

[0148] Subsequently, the determination unit 30C calculates the total cumulative charging time obtained by summing up all the total cumulative charging times associated with each temperature range for each charging power included in the charging history information (step S403), and determines whether the total cumulative charging time is equal to or greater than the first threshold value (step S404). In step S404, if the total cumulative charging time is less than the first threshold value, the controller 30 ends the process. Note that the first threshold value may be set in advance and held by the determination unit 30C.

[0149] In the following description, the processing of steps S403 and S404 in FIG. 4 by the determination unit 30C may sometimes be expressed as the first determination processing by the determination unit 30C.

[0150] In step S404, when the total cumulative charging time is equal to or greater than the first threshold, the controller 30 causes the display device 40 to display a notification instructing the performance of maintenance on the power storage device 19 by the display control unit 30D (step S405), and ends the process. In other words, when the result of the first determination process is "Yes", the controller 30 causes the display device 40 to display a notification instructing the performance of maintenance on the power storage device 19 by the display control unit 30D. Note that the notification instructing the performance of maintenance is included in the notification of information regarding the performance of maintenance.

[0151] Also, in the present embodiment, as information regarding the performance of maintenance, instead of the notification instructing the performance of maintenance, an index indicating the deterioration state of the power storage device 19, the period during which the power storage device 19 deteriorates until a state where maintenance is required, etc. may be displayed on the display device 40. The period during which the power storage device 19 deteriorates until a state where maintenance is required is, in other words, the charging time allowed for the power storage device 19 until the performance of maintenance is instructed.

[0152] Here, the notification displayed on the display device 40 may be continuously displayed until the maintenance of the power storage device 19 is performed. Specifically, the maintenance of the power storage device 19 may be replacement of the power storage device 19 or the like.

[0153] Note that in the example of FIG. 4, in step S401, it is determined whether or not the excavator 100 has been started, and it is assumed that when the excavator 100 has been started, the processes after step S402 are executed, but the present invention is not limited to this.

[0154] In the present embodiment, for example, each time one charging is completed and the charge history information is updated, the processes after step S402 may be executed. By doing so, it is possible to determine whether or not to issue a notification instructing maintenance based on the latest charge history information.

[0155] Hereinafter, with reference to FIG. 5, a display example of the display device 40 of the present embodiment will be described. FIG. 5 is a first diagram showing a display example of the first embodiment.

[0156] FIG. 5 shows an example (screen SC1) of the main screen displayed on the image display unit 41M of the main monitor 40M which is one of the display devices 40. The screen SC1 includes a time display unit 411, a rotation speed mode display unit 412, a traveling mode display unit 413, an attachment display unit 414, a motor control state display unit 415, a hydraulic oil temperature display unit 416, a remaining amount display unit 417 of the power storage device, a cooling water temperature display unit 418, a motor operation time display unit 419, a camera image display unit 420, and a composite image display unit 422. The rotation speed mode display unit 412, the traveling mode display unit 413, the attachment display unit 414, and the motor control state display unit 415 are display units that display information regarding the setting state of the excavator 100. The hydraulic oil temperature display unit 416, the remaining amount display unit 417 of the power storage device, the cooling water temperature display unit 418, and the motor operation time display unit 419 are display units that display information regarding the operation state of the excavator 100. The images displayed on each unit are generated by the display device 40 using various data acquired by the controller 30 and image data acquired by the peripheral information acquisition device 50 (camera).

[0157] The time display unit 411 displays the current time. The rotation speed mode display unit 412 displays the rotation speed mode set by a motor rotation speed adjustment dial (not shown) as the operation information of the excavator 100. The traveling mode display unit 413 displays the traveling mode as the operation information of the excavator 100. The traveling mode represents the setting state of the traveling hydraulic motor using a variable displacement motor. For example, the traveling mode has a low speed mode and a high speed mode, and in the low speed mode, a mark resembling a "turtle" is displayed, and in the high speed mode, a mark resembling a "rabbit" is displayed.

[0158] The attachment display unit 414 is an area that displays an icon representing the type of the currently attached attachment. The motor control state display unit 415 displays the control state of the pump motor 12 as the operation information of the excavator 100.

[0159] In the example shown in FIG. 5, the "automatic deceleration and automatic stop mode" is selected as the control state of the pump motor 12. The "automatic deceleration and automatic stop mode" means a control state in which the motor speed is automatically reduced according to the duration of the non-operation state, and further the pump motor 12 is automatically stopped. In addition, the control states of the pump motor 12 include an "automatic deceleration mode", an "automatic stop mode", and a "manual deceleration mode", etc.

[0160] The hydraulic oil temperature display unit 416 displays the temperature of the hydraulic oil of the excavator 100. The temperature of the hydraulic oil may be acquired by a temperature sensor (not shown) or the like. The remaining battery level display unit 417 indicates the charge amount of the power storage device 19. In other words, the remaining battery level display unit 417 indicates the state of charge (SOC) of the power storage device 19. In the example shown in FIG. 5, a bar gauge representing the current SOC of the power storage device 19 is displayed on the remaining battery level display unit 417. The SOC is displayed based on the data output from the power storage device 19.

[0161] The battery temperature display unit 418 displays the temperature state of the power storage device 19 as operation information of the excavator 100. In the example shown in FIG. 5, the temperature of the power storage device 19 is displayed on the battery display unit 418. Note that the power storage device 19 includes a plurality of power storage modules, and the average value of the temperatures of the plurality of power storage modules may be displayed as the temperature of the power storage device 19 on the battery display unit 418.

[0162] Also, in the present embodiment, the temperature of high-voltage components other than the power storage device 19 may be displayed on the screen SC1. The high-voltage components include the inverter 18, the on-vehicle charger 70, the DC-DC converter 44, and the pump motor 12.

[0163] The motor operation time display unit 419 displays the cumulative operation time of the pump motor 12 as the operation information of the excavator 100. In the example shown in FIG. 5, the cumulative lifetime operation time for the entire period after the manufacture of the excavator is displayed together with the unit "hr (hours)". In the motor operation time display unit 419, the replacement of the power storage device 19, the maintenance of the battery motor 12, etc. may be performed, and the interval operation time since the count was restarted may be displayed.

[0164] The camera image display unit 420 displays an image captured by a camera as the peripheral information acquisition device 50. In the example shown in FIG. 5, the image captured by the rear camera 50B attached to the rear end of the upper surface of the upper swing body 3 is displayed on the camera image display unit 420. The camera image display unit 420 may display a camera image captured by the left camera 50L attached to the left end of the upper surface of the upper swing body 3 or the right camera 50R attached to the right end of the upper surface. Further, the camera image display unit 420 may display camera images captured by a plurality of cameras among the left camera 50L, the right camera 50R, and the rear camera 50B arranged side by side.

[0165] Each camera may be installed so that a part of the image of the upper swing body 3 is included in the camera image. By including a part of the image of the upper swing body 3 in the displayed image, it becomes easier for the operator to grasp the sense of distance between the object displayed on the camera image display unit 420 and the excavator 100. In the example shown in FIG. 5, the camera image display unit 420 displays an image of the counterweight 3w of the upper swing body 3.

[0166] On the camera image display unit 420, a figure 421 representing the orientation of the camera (rear camera 50B) that captured the currently displayed camera image is displayed. The figure 421 is composed of an excavator figure 421a representing the shape of the excavator 100 and a strip-shaped direction display figure 421b representing the shooting direction of the camera that captured the currently displayed camera image. The figure 421 is a display unit that displays information regarding the set state of the excavator 100.

[0167] In the example shown in FIG. 5, a direction display graphic 421b is displayed below the shovel graphic 421a (on the side opposite to the graphic representing the attachment AT). This indicates that an image of the rear of the shovel 100 taken by the rear camera 50B is being displayed on the camera image display unit 420. For example, when an image taken by the right camera 50R is being displayed on the camera image display unit 420, the direction display graphic 421b is displayed on the right side of the shovel graphic 421a. Also, for example, when an image taken by the left camera 50L is being displayed on the camera image display unit 420, the direction display graphic 421b is displayed on the left side of the shovel graphic 421a.

[0168] For example, the operator can switch the image displayed on the camera image display unit 420 to an image taken by another camera or the like by pressing an image switching switch (not shown) provided inside the cab 10.

[0169] The composite image display unit 422 displays a composite image of a plurality of camera images captured by at least two of a plurality of cameras (left camera 50L, right camera 50R, and rear camera 50B). In the example shown in FIG. 5, an overhead image, which is a composite image of three camera images respectively captured by the left camera 50L, right camera 50R, and rear camera 50B, is displayed so as to surround the left, rear, and right sides of the shovel graphic on the composite image display unit 422. Note that an overhead image, which is a composite image of four camera images respectively captured by the front camera 50F, left camera 50L, right camera 50R, and rear camera 50B, may be displayed so as to surround the front, left, rear, and right sides of the shovel graphic on the composite image display unit 422.

[0170] Also, on the screen SC1 shown in FIG. 5, a display area 510 is included. The display area 510 is continuously displayed after the shovel 100 is started when the total cumulative charging time is equal to or greater than a first threshold value in step S404 of FIG. 4. A message instructing maintenance of the power storage device 19 is displayed in the display area 510.

[0171] In this embodiment, in this way, by referring to the temperature of the power storage device 19 that affects the deterioration of the power storage device 19 and the charging history information including the charging method for the power storage device 19, it is determined whether it is time to perform maintenance. Therefore, according to this embodiment, a message instructing maintenance of the power storage device 19 can be displayed at an appropriate timing considering the deterioration of the power storage device 19, and the operator can be made aware of the appropriate maintenance timing.

[0172] Note that the screen SC1 may be displayed on, for example, the support device 300 or the management device 200. In other words, in this embodiment, a notification instructing the implementation of maintenance of the power storage device 19 may be output to and displayed on a device other than the excavator 100.

[0173] By doing so, it is possible to notify the support device user and the management device user that the time for maintaining the power storage device 19 has arrived.

[0174] Also, in this embodiment, the charging history information stored in the charging history storage unit 30E may be displayed on the display device 40. FIG. 6 is a second diagram showing a display example of the first embodiment. On the screen SC1A shown in FIG. 6, a display area 520 is included. The charging history information shown in FIG. 3 is displayed in the display area 520. Note that the screen SC1A may be displayed on the display device 40 by a specific operation by a service technician or the like who performs maintenance, for example, when performing maintenance on the power storage device 19.

[0175] In this way, by allowing the service technician who performs maintenance to view the charging history information, the service technician can be made aware of the charging history of the power storage device 19 and can infer the deterioration status.

[0176] Also, the screen SC1A may be displayed on, for example, the support device 300 or the management device 200. In other words, in this embodiment, a notification instructing the implementation of maintenance of the power storage device 19 may be output to and displayed on a device other than the excavator 100.

[0177] By doing so, it is possible to let the support device user and the management device user know the charging history of the power storage device 19 and infer the deterioration status.

[0178] Also, the screens SC1 and SC1A shown in FIGS. 5 and 6 may be displayed on the remote operation display device. By doing so, for example, when the excavator 100 is being operated by remote control, the operator operating the excavator 100 by remote control can be made aware of the timing for maintaining the power storage device 19.

[0179] (Second Embodiment) Hereinafter, with reference to the drawings, the second embodiment will be described. In the second embodiment, it is different from the first embodiment in that it is determined whether to output a notification instructing maintenance based on the total cumulative charging time when the power storage device 19 is at a high temperature. In the following description of the second embodiment, the differences from the first embodiment will be described, and components having the same functional configuration as those in the first embodiment will be given the same reference numerals as those used in the description of the first embodiment, and the description thereof will be omitted.

[0180] FIG. 7 is a flowchart for explaining the operation of the excavator according to the second embodiment. Since the processes in steps S701 and S702 in FIG. 7 are the same as the processes in steps S401 and S402 in FIG. 4, the description thereof will be omitted.

[0181] Subsequently, the determination unit 30C calculates the total cumulative charging time when the power storage device 19 is at a high temperature (step S703). Specifically, the determination unit 30C extracts the cumulative charging time when the temperature of the power storage device 19 is 40° C. or higher from the charging history information, and calculates the total of the extracted cumulative charging times.

[0182] Subsequently, the determination unit 30C determines whether or not the total cumulative charging time when the power storage device 19 is at a high temperature is equal to or greater than a second threshold value (step S704). In other words, the determination unit 30C determines whether or not the total cumulative charging time when the temperature at the time of charging the power storage device 19 is equal to or higher than a predetermined temperature is equal to or greater than the second threshold value.

[0183] In step S704, when the total cumulative charging time when the power storage device 19 is at a high temperature is less than the second threshold value, the controller 30 ends the process. Note that the second threshold value may be set in advance and held by the determination unit 30C. Also, the second threshold value is set to a shorter time (period) than the time (period) indicated by the first threshold value.

[0184] In the following description, the processes of step S703 and step S704 in FIG. 7 by the determination unit 30C may be expressed as a second determination process by the determination unit 30C.

[0185] In step S704, when the total cumulative charging time when the power storage device 19 is at a high temperature is equal to or greater than the second threshold value, the controller 30 causes the display control unit 30D to display, on the display device 40, a notification instructing the implementation of maintenance of the power storage device 19 (step S705), and ends the process. In other words, when the result of the second determination process is "Yes", the controller 30 causes the display control unit 30D to display, on the display device 40, a notification instructing the implementation of maintenance of the power storage device 19.

[0186] In the present embodiment, in this way, based on the total cumulative charging time in the temperature range where the deterioration of the power storage device 19 easily progresses, it is determined whether or not to output a notification instructing the implementation of maintenance of the power storage device 19. For this reason, in the present embodiment, the longer the period until the implementation of maintenance of the power storage device 19 is instructed, the more opportunities there are for normal charging in which deterioration hardly progresses, and the service life of the power storage device 19 can be extended.

[0187] In addition, in the present embodiment, when the power storage device 19 is at 40°C or higher, it is regarded as the case where the power storage device 19 is at a high temperature. However, the temperature at which it is determined that the power storage device 19 is in a high-temperature state is not limited to 40°C. For example, when the power storage device 19 is at 35°C or higher, it may be regarded as the case where the power storage device 19 is at a high temperature.

[0188] Further, in the present embodiment, for example, for each temperature range when the power storage device 19 is at a high temperature, the sum of the cumulative charging times is calculated. When any one of the sums of the cumulative charging times for each temperature range is equal to or greater than a threshold value set for each temperature range, a notification instructing the implementation of maintenance may be output.

[0189] Specifically, the determination unit 30C calculates, for example, the sum of the cumulative charging times when the temperature range is 40°C or higher and less than 50°C, and the sum of the cumulative charging times when the temperature range is 50°C or higher, and compares them with the threshold values set in advance for each. Then, when either the case where the temperature range is 40°C or higher and less than 50°C or the case where the temperature range is 50°C or higher has a sum of cumulative charging times equal to or greater than the corresponding threshold value, the determination unit 30C may output a notification instructing maintenance.

[0190] In this case, the threshold value set for the temperature range "40°C or higher and less than 50°C" is a shorter time than the threshold value set for the temperature range "50°C or higher".

[0191] By doing so, it is possible to grasp in detail the deterioration of the power storage device 19 due to charging at a high temperature and notify the implementation of maintenance.

[0192] Further, the determination unit 30C calculates the sum of the cumulative charging times for each charging method. When any one of the sums of the cumulative charging times for the charging methods is equal to or greater than a threshold value set for each charging method, a notification instructing the implementation of maintenance may be output.

[0193] Specifically, for example, the determination unit 30C calculates the total cumulative charging time when the charging method is normal charging, the total cumulative charging time when the charging method is rapid charging, and the total cumulative charging time when the charging method is ultra-rapid charging, and compares each of them with a preset threshold value. Then, when any one of the total cumulative charging times for each charging method is equal to or greater than the threshold value corresponding to each charging method, the determination unit 30C may output a notification instructing maintenance.

[0194] In this case, the threshold value set for the case where the charging method is normal charging is the longest time, and the threshold value set for the case where the charging method is ultra-rapid charging is the shortest time.

[0195] Further, the determination unit 30C calculates the total cumulative charging time for each range of charging power, and when any one of the total cumulative charging times for each range of charging power is equal to or greater than the threshold value set for each range of charging power, may output a notification instructing the implementation of maintenance.

[0196] In this case, the lower the range of the charging power value, the longer the set threshold value. More specifically, for example, the threshold value set for the range of charging power "6 kW or less" is the longest time, and the threshold value set for the range of charging power "190 kW or more and less than 200 kW" is the shortest time.

[0197] Furthermore, the determination unit 30C calculates the total cumulative charging time for each temperature range, and when any one of the total cumulative charging times for each temperature range is equal to or greater than the threshold value set for each temperature range, may output a notification instructing the implementation of maintenance.

[0198] In this case, the lower the temperature range indicated by the temperature range, the longer the set threshold value. More specifically, for example, the threshold value set for the temperature range "20°C or less" is the longest time, and the threshold value set for the temperature range "50°C or more" is the shortest time.

[0199] In this embodiment, in this way, by determining whether to issue a notification instructing the maintenance of the power storage device 19 by using various types of information included in the charging history information, it is possible to suppress the occurrence of a situation where maintenance is instructed even though the deterioration of the power storage device 19 has not progressed so much.

[0200] (Third Embodiment) Hereinafter, with reference to the drawings, the third embodiment will be described. In the third embodiment, it is different from the first embodiment in that a charging method recommended based on the total cumulative charging time in ultra-rapid charging is notified. In the following description of the third embodiment, the differences from the first embodiment will be described, and components having the same functional configuration as those in the first embodiment will be given the same reference numerals as those used in the description of the first embodiment, and the description thereof will be omitted.

[0201] FIG. 8 is a flowchart for explaining the operation of the excavator according to the third embodiment. Since the processes in steps S801 and S802 in FIG. 8 are the same as the processes in steps S401 and S402 in FIG. 4, the description thereof will be omitted.

[0202] Subsequently, the determination unit 30C calculates the total cumulative charging time in ultra-rapid charging (step S803). Specifically, the determination unit 30C extracts the cumulative charging time when the charging method is "ultra-rapid charging" from the charging history information, and calculates the sum of the extracted cumulative charging times.

[0203] Subsequently, the determination unit 30C determines whether the total cumulative charging time of ultra-rapid charging is equal to or greater than a third threshold value (step S804). In other words, the determination unit 30C determines whether the total cumulative charging time when the charging power of the power storage device 19 is equal to or greater than a predetermined value is equal to or greater than the third threshold value.

[0204] Note that the third threshold value may be set in advance and held by the determination unit 30C. Also, the third threshold value is set to a time (period) shorter than the time (period) indicated by the second threshold value.

[0205] In step S804, when the total cumulative charging time of the ultra-rapid charging is equal to or greater than the third threshold, the controller 30 causes the display device 40 to display a notification instructing the implementation of maintenance of the power storage device 19 by the display control unit 30D (step S805), and ends the process. In other words, when the result of the third determination process is "Yes", the controller 30 causes the display device 40 to display a notification instructing the implementation of maintenance of the power storage device 19 by the display control unit 30D.

[0206] In step S804, when the total cumulative charging time of the ultra-rapid charging is less than the third threshold (when the result of the third determination process is "No"), the determination unit 30C sets a fourth threshold for the total cumulative charging time in the ultra-rapid charging, and determines whether the total cumulative charging time in the ultra-rapid charging is equal to or greater than the fourth threshold (step S806).

[0207] Note that the fourth threshold is set to a time (period) shorter than the time (period) indicated by the third threshold.

[0208] In step S806, when the total cumulative charging time in the ultra-rapid charging is less than the fourth threshold, the controller 30 ends the process.

[0209] In step S806, when the total cumulative charging time in the ultra-rapid charging is equal to or greater than the fourth threshold, the controller 30 causes the display device 40 to display a notification recommending a charging method other than the ultra-rapid charging (step S807).

[0210] At this time, the display control unit 30D may display the range of the recommended charging power together with the recommended charging method, or may display the range of the recommended charging power instead of the recommended charging method. Note that the notification displayed in step S807 is included in the notification of information regarding the implementation of maintenance.

[0211] Subsequently, the controller 30 determines, by means of the charge detection unit 30A, whether the start of ultra-rapid charging has been detected during the startup of the excavator 100 (step S808). In step S808, if the start of ultra-rapid charging is not detected, the controller 30 ends the process.

[0212] In step S808, if the start of ultra-rapid charging is detected, the controller 30 causes a warning to be displayed by the display control unit 30D (step S809).

[0213] Specifically, the display control unit 30D may display, for example, as an example of a warning, a notification indicating that charging of the power storage device 19 is prohibited, or a notification indicating that the charging power is limited to a value equal to or less than a predetermined value, on the display device 40. Further, the controller 30 of the present embodiment may limit the charging power supplied to the power storage device 19 to within the range of the charging power of normal charging when outputting a warning.

[0214] In the present embodiment, in this way, based on the total cumulative charging time of ultra-rapid charging, which has a significant impact on the deterioration of the power storage device 19, it is determined whether to issue a notification instructing the implementation of maintenance. For this reason, in the present embodiment, it is possible to prevent the power storage device 19 from being charged beyond the allowable range of deterioration.

[0215] Further, in the present embodiment, when the total cumulative charging time of ultra-rapid charging is equal to or greater than a fourth threshold value and less than a third threshold value, a notification recommending a charging method other than ultra-rapid charging is output.

[0216] Therefore, according to the present embodiment, the period until the implementation of maintenance of the power storage device 19 is instructed can be extended, and the service life of the power storage device 19 can be extended.

[0217] Further, in the present embodiment, when the total cumulative charging time of ultra-rapid charging is equal to or greater than a fourth threshold value and less than a third threshold value, by displaying the range of the recommended charging power, it is possible to assist the operator in setting the charging power when charging is performed next.

[0218] (Fourth Embodiment) The following describes the fourth embodiment with reference to the drawings. In the fourth embodiment, it is different from the first embodiment in that it determines whether to output a notification instructing maintenance based on the total cumulative charging time when rapid charging is performed while the power storage device 19 is at a high temperature. In the following description of the fourth embodiment, the differences from the first embodiment will be described, and components having the same functional configuration as those in the first embodiment will be given the same reference numerals as those used in the description of the first embodiment, and the description thereof will be omitted.

[0219] FIG. 9 is a flowchart for explaining the operation of the excavator according to the fourth embodiment. Since the processes in steps S901 and S902 in FIG. 9 are the same as the processes in steps S401 and S402 in FIG. 4, the description thereof will be omitted.

[0220] Subsequently, the determination unit 30C calculates the total cumulative charging time when the power storage device 19 is at a high temperature and rapid charging is performed (step S903). Specifically, the determination unit 30C extracts the cumulative charging time when the temperature of the power storage device 19 is 40° C. or higher and the charging method is "rapid charging" from the charging history information, and calculates the total of the extracted cumulative charging times.

[0221] Subsequently, the determination unit 30C determines whether the total cumulative charging time when the temperature of the power storage device 19 is 40° C. or higher and the charging method is "rapid charging" or [omitted content] is equal to or greater than a fifth threshold value (step S904). In other words, the determination unit 30C determines whether the total cumulative charging time when rapid charging is performed at a temperature equal to or higher than a predetermined temperature when the power storage device 19 is charged is equal to or greater than the fifth threshold value.

[0222] In step S904, when the temperature of the power storage device 19 is 40°C or higher and the sum of the cumulative charging times when the charging method is "rapid charging" is less than the fifth threshold, the controller 30 ends the process. Note that the fifth threshold may be set in advance and held by the determination unit 30C. Also, the fifth threshold is set to a time (period) shorter than the time (period) indicated by the second threshold.

[0223] In the following description, the processes of step S903 and step S904 in FIG. 9 by the determination unit 30C may be expressed as the fourth determination process by the determination unit 30C.

[0224] In step S904, when the temperature of the power storage device 19 is 40°C or higher and the sum of the cumulative charging times when the charging method is "rapid charging" is equal to or greater than the fifth threshold, the controller 30 causes the display device 40 to display a notification instructing the implementation of maintenance of the power storage device 19 by the display control unit 30D (step S905), and ends the process.

[0225] In other words, when the result of the fourth determination process is "Yes", the controller 30 causes the display device 40 to display a notification instructing the implementation of maintenance of the power storage device 19 by the display control unit 30D.

[0226] In the present embodiment, in this way, based on the sum of the cumulative charging times when charging is performed in a temperature range where the power storage device 19 is likely to deteriorate and by a charging method in which the power storage device 19 is likely to deteriorate, it is determined whether to output a notification instructing the implementation of maintenance of the power storage device 19.

[0227] Therefore, in the present embodiment, even when the power storage device 19 deteriorates in a short period compared to when the power storage device 19 is charged by normal charging or charged in a temperature range of less than 40°C, the result of the power storage device 19 can be detected and maintenance can be performed at an appropriate timing.

[0228] Note that in this embodiment, in step S903, the total cumulative charging time when rapid charging is performed when the power storage device 19 is at a high temperature is calculated, but the present invention is not limited to this.

[0229] In this embodiment, for example, the total cumulative charging time when ultra-rapid charging is performed when the power storage device 19 is at a high temperature may be calculated and compared with a fifth threshold value. Further, in this embodiment, for example, the total of the cumulative charging time when rapid charging is performed when the power storage device 19 is at a high temperature and the cumulative charging time when ultra-rapid charging is performed when the power storage device 19 is at a high temperature may be calculated and compared with the fifth threshold value.

[0230] The fifth threshold value may be set in advance according to the cumulative charging time for which the total is calculated in step S903.

[0231] (Fifth Embodiment) The fifth embodiment will be described below with reference to the drawings. The fifth embodiment is different from the first embodiment in that the determination processes described in the first to fourth embodiments are executed in parallel. Therefore, in the following description of the fifth embodiment, the differences from the first embodiment will be described, and components having the same functional configuration as those in the first embodiment will be given the same reference numerals as those used in the description of the first embodiment, and the description thereof will be omitted.

[0232] FIG. 10 is a flowchart for explaining the processing of the excavator according to the fifth embodiment. The processing of steps S1001 and S1002 in FIG. 10 is the same as the processing of steps S401 and S402 in FIG. 4, and thus the description thereof will be omitted.

[0233] Subsequently, the controller 30 causes the determination unit 30C to perform the first determination process, the second determination process, the third determination process, and the fourth determination process in parallel (steps S1003, S1004, S1005, and S1006).

[0234] Subsequently, the controller 30 determines, by the determination unit 30C, whether any one of the results of the first determination process, the result of the second determination process, the result of the third determination process, and the result of the fourth determination process is "Yes" (step S1007).

[0235] In step S1007, if all of the results of the first determination process, the result of the second determination process, the result of the third determination process, and the result of the fourth determination process are "No", the controller 30 proceeds to step S806 in FIG. 8.

[0236] In step S1007, if any one of the results of the first determination process, the result of the second determination process, the result of the third determination process, and the result of the fourth determination process is "Yes", the controller 30 outputs a notification instructing the execution of maintenance of the power storage device 19 by the display control unit 30D (step S1008), and ends the process.

[0237] As described above, in this embodiment, it is determined whether to output a notification instructing the execution of maintenance of the power storage device 19 by using a plurality of types of information obtained from the charging history information. Therefore, according to this embodiment, it is possible to allow the user of the excavator 100 to grasp the maintenance timing of the power storage device 19 in consideration of the charging method and charging environment of the power storage device 19.

[0238] Note that, in this embodiment, when the power storage device 19 is replaced due to maintenance, the cumulative charging time included in the charging history information stored in the charging history storage unit 30E may be set to "0". Further, in this embodiment, the above-described first threshold value to fifth threshold value may be changed according to the deterioration state of the power storage device 19 after replacement.

[0239] In this case, for the controller 30, the first to fifth threshold values may be set step by step according to the degree of deterioration indicated by the index indicating the deterioration state of the power storage device 19. For example, in the controller 30, the first to fourth threshold values when the degree of deterioration is small, the first to fifth threshold values when the degree of deterioration is moderate, and the first to fifth threshold values when the degree of deterioration is large may be set and held in advance.

[0240] Also, in this case, the time (period) indicated by the first to fifth threshold values may be set such that the smaller the degree of deterioration, the longer the time (period) indicated by the first to fifth threshold values, and the larger the degree of deterioration, the shorter the time (period) indicated by the first to fifth threshold values.

[0241] When the replaced power storage device 19 is mounted, the controller 30 acquires an index indicating the deterioration state of the power storage device 19 from this power storage device 19. Then, the first to fifth threshold values corresponding to the degree of deterioration indicated by the index are set in the determination unit 30C.

[0242] In this embodiment, in this way, since the first to fifth threshold values are changed according to the degree of deterioration of the replaced power storage device 19, for example, even when the replaced power storage device 19 is a used product, the appropriate maintenance time can be notified.

[0243] Further, in this embodiment, according to the temperature of the power storage device 19 and the charging power when the power storage device 19 is charged, the time (period) indicated by each of the first to fifth threshold values is made different. In other words, in this embodiment, the threshold values serving as the criteria for determination by the determination unit 30C are made different according to the damage caused by charging to the power storage device 19. Specifically, the period indicated by the first threshold value is the longest, followed by the period indicated by the second threshold value, then the period indicated by the third threshold value, and the period indicated by the fourth threshold value is the shortest. Also, the fifth threshold value may be shorter than the second threshold value.

[0244] For example, when ultra-rapid charging is performed with the temperature of the power storage device 19 being 40°C or higher, and when normal charging is performed with the temperature of the power storage device 19 being 20°C or lower, the damage to the power storage device 19 is greater when charging is performed in the former case than when charging is performed in the latter case, and the deterioration is accelerated.

[0245] In the present embodiment, in this way, by setting a plurality of thresholds according to the charging environment of the power storage device 19 in consideration of the damage to the power storage device 19, it is possible to instruct the maintenance of the power storage device 19 at an appropriate time.

[0246] Note that the functions realized by the controller 30 in each of the above-described embodiments may be realized in the management device 200 or the support device 300. In that case, the management device 200 or the support device 300 may have a charging history acquisition unit 30B, a determination unit 30C, a display control unit 30D, and a charging history storage unit 30E, and the controller 30 of the excavator 100 may not have these.

[0247] Also, in each of the above-described embodiments, the notification instructing the implementation of the maintenance of the power storage device 19 is assumed to be displayed on the display device, but it is not limited to this. The notification instructing the implementation of the maintenance of the power storage device 19 may be output as, for example, voice or the like.

[0248] Also, in the present embodiment, the excavator 100 is taken as an example of the work machine, but the work machine is not limited to the excavator 100. The work machine may be an electric one, and for example, it may be a crane, a road machine, a forklift, or the like.

[0249] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments. Various modifications, substitutions, etc. can be applied to the above-described embodiments without departing from the scope of the present invention. Also, the features described separately can be combined as long as there is no technical contradiction.

Explanation of Reference Numerals

[0250] 1 Lower traveling body 2 Slewing mechanism 3 Upper slewing body 4 Boom 5 Arm 6 Bucket 19 Energy storage device 30 Controller 30A Charge detection unit 30B Charge history acquisition unit 30C Judgment unit 30D Display control unit 30E Charge history storage unit 40 Display device 72 Charging port 100 Excavator

Claims

1. an electric motor for driving a hydraulic pump, a power storage device for supplying power to the electric motor, a control device that outputs information regarding the maintenance of the power storage device based on charge history information including charge power in the charging performed on the power storage device, the temperature of the power storage device when charging is performed, and a charging time associated with at least one of the charge power or the temperature of the power storage device,

2. The information regarding the maintenance of the power storage device includes an index indicating the deterioration state of the power storage device, a notification instructing the implementation of the maintenance of the power storage device, and a charging time allowed for the power storage device until the implementation of the maintenance is instructed. The working machine according to Claim 1.

3. The charge history information is information in which the cumulative charging time indicating the total charging time since the power storage device was mounted on the working machine is associated with each range of charging power including the charging power when charging is performed and each temperature range including the temperature of the power storage device when charging is performed, The control device When the sum of all the cumulative charging times included in the charge history information is equal to or greater than a first threshold value, or when the sum of the cumulative charging times associated with a temperature range of a predetermined temperature or higher among the cumulative charging times included in the charge history information is equal to or greater than a second threshold value, or when the sum of the cumulative charging times associated with a range of charging power of a predetermined charging power or higher among the cumulative charging times included in the charge history information is equal to or greater than a third threshold value, or when the sum of the cumulative charging times associated with a range of charging power of a predetermined charging power or higher and a temperature range of a predetermined temperature or higher among the cumulative charging times included in the charge history information is equal to or greater than a fifth threshold value, a notification instructing the implementation of the maintenance of the power storage device is displayed on the display device of the working machine. The working machine according to Claim 1 or 2.

4. The charge history information is information in which the cumulative charging time indicating the total charging time since the power storage device was mounted on the working machine is associated with each range of charging power including the charging power when charging is performed and each temperature range including the temperature of the power storage device when charging is performed, The control device When the sum of all the cumulative charging times included in the charging history information is equal to or greater than a first threshold value, when the sum of the cumulative charging times associated with a temperature range of a predetermined temperature or higher among the cumulative charging times included in the charging history information is equal to or greater than a second threshold value, when the sum of the cumulative charging times associated with a charging power range of a predetermined charging power or higher among the cumulative charging times included in the charging history information is equal to or greater than a third threshold value, when the sum of the cumulative charging times associated with a charging power of a predetermined charging power or higher and a temperature range of a predetermined temperature or higher among the cumulative charging times included in the charging history information is equal to or greater than a fifth threshold value, in at least any one of these cases, a notification instructing the implementation of maintenance of the power storage device is displayed on the display device of the work machine. The work machine according to claim 1 or 2.

5. For each of the first threshold value, the second threshold value, and the third threshold value, the period indicated by the first threshold value is the longest, and the period indicated by the third threshold value is the shortest. The work machine according to claim 4.

6. The control device When the sum of the cumulative charging times when the charging power is equal to or greater than a predetermined power is equal to or greater than a fourth threshold value indicating a period shorter than the period indicated by the third threshold value, a notification indicating the recommended charging power is output. The work machine according to claim 4.

7. The control device Receives a specific operation and causes the charging history information to be displayed on the display device. The work machine according to claim 1 or 2.

8. A work machine management system including a work machine and a management device that manages the work machine, The work machine An electric motor for driving a hydraulic pump, A power storage device that supplies power to the electric motor, Based on charging history information including the charging power in the charging performed on the power storage device, the temperature of the power storage device when charging is performed, and the charging time associated with at least one of the charging power or the temperature of the power storage device, a control device that outputs information regarding the implementation of maintenance of the power storage device. A work machine management system having

9. The control device Outputs information regarding the implementation of maintenance of the power storage device to a device other than the work machine including the management device. The work machine management system according to claim 8.

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