Work vehicle

Abstract

To provide a work vehicle that is able to change the capacity of a mounted battery according to a battery capacity required by a user.SOLUTION: A work vehicle includes: a vehicle body capable of traveling; a work device provided on the vehicle body; a pump drive motor 53 that operates the work device; a fixedly installed battery 70, which is fixedly installed on the vehicle body; a portable battery 80, which is installed so as to be freely detached from the vehicle body; and a power supply device 100 that supplies power from the fixedly installed battery 70 and the portable battery 80 to the pump drive motor 53. The power supply device 100 can supply power to the pump drive motor 53 by connecting the fixedly installed battery 70 and the portable battery 80 in parallel.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a work vehicle provided with a battery for supplying power to operate a work device installed in a mounting portion of a vehicle body.

Background Art

[0002] Conventionally, there are work vehicles equipped with various work devices suitable for various operations, such as a device for loading and unloading a load to be transported from a loading platform provided in a mounting portion of a vehicle body, and a lifting device for lifting and lowering a worker and equipment for performing work at a high place. As the above-described work device, one that is operated by a hydraulic actuator is generally known. However, the hydraulic pressure for operating this type of work device is generated by driving a hydraulic pump by a driving force taken out from an engine mounted on the work vehicle via a PTO mechanism (power take-off mechanism).

[0003] Also, for example, in a work site such as a residential area where it is necessary to suppress engine noise and exhaust gas generation, there is also one equipped with an electric motor that rotates by a battery as a drive source for a hydraulic pump that generates hydraulic pressure for operating the work device (see, for example, Patent Document 1). In the work vehicle described in Patent Document 1, a charger is further provided to improve workability, and a power supply unit including a motor control device and a charger is disposed on an outrigger box, so that the power supply unit is compactly disposed without disturbing the storage space and loading space of the work device.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As mentioned above, in work vehicles that generate hydraulics using batteries as a power source, the required battery capacity varies depending on the user and the work being done. However, in order to meet diverse needs and to avoid situations where the work equipment stops operating due to insufficient battery capacity, these vehicles are often equipped with large-capacity batteries to provide ample margin. However, large-capacity batteries are generally larger, heavier, and more expensive. For users who do not require such a large capacity, this may lead to dissatisfaction, as the reduction in loading space on the work vehicle due to the larger battery, as well as the cost and workload of battery replacement, may not be commensurate with the battery capacity they need.

[0006] This invention has been made in view of these problems, and aims to provide a work vehicle that can change the capacity of the battery installed according to the battery capacity required by the user. [Means for solving the problem]

[0007] To solve the above problems, the work vehicle according to the present invention comprises a drivable vehicle body, a work device (for example, a slewing platform 20, boom 30, and work platform 40 in the embodiment) provided on the vehicle body, an electric device (for example, a pump drive motor 53) for operating the work device, a fixed battery fixedly installed on the vehicle body, a portable battery detachably installed from the vehicle body, and a power supply device that supplies power from the fixed battery and the portable battery to the electric device, wherein the power supply device connects the fixed battery and the portable battery in parallel. Both power sources can be supplied to the electric motor simultaneously. (For example, SW1 → ON, SW2 → ON, SW3 → OFF of power supply switch 107) )and It is characterized by doing so.

[0008] In the work vehicle with the above configuration, it is preferable that the power supply device is configured to be able to supply power to the electric motor only from the fixed battery (for example, SW1 → ON, SW2 → OFF, SW3 → OFF of the power supply switch 107), and to be able to switch the power supplied to the electric motor from the fixed battery to the portable battery when the remaining charge of the fixed battery falls below a predetermined value (for example, SW1 → OFF, SW2 → ON, SW3 → OFF of the power supply switch 107).

[0009] Furthermore, the work vehicle according to the present invention comprises a drivable vehicle body, work equipment (for example, a slewing platform 20, boom 30, and work platform 40 in the embodiment) provided on the vehicle body, an electric motor (for example, a pump drive motor 53) for operating the work equipment, a fixed battery fixedly installed on the vehicle body, a portable battery detachably installed from the vehicle body, and a power supply device that supplies power from the fixed battery and the portable battery to the electric motor, The power supply device The fixed-installed battery and the portable battery are connected in parallel to supply power to the electric motor, and only power from the fixed-installed battery is supplied to the electric motor (for example, SW1 → ON, SW2 → OFF, SW3 → OFF of the power supply switch 107), and when the remaining charge of the fixed-installed battery falls below a predetermined value, the power supplied to the electric motor can be switched from the fixed-installed battery to the portable battery (for example, SW1 → OFF, SW2 → ON, SW3 → OFF of the power supply switch 107), The aforementioned fixed-installed battery to The power from the portable battery is supplied to the electric motor, and the power from the portable battery can be supplied to an electric drive device different from the electric motor (for example, SW1 → ON, SW2 → OFF, SW3 → ON of the power supply switch 107). It is characterized by the following:

[0010] Furthermore, the work vehicle according to the present invention comprises a drivable vehicle body, work equipment (for example, a slewing platform 20, boom 30, and work platform 40 in the embodiment) provided on the vehicle body, an electric motor (for example, a pump drive motor 53) for operating the work equipment, a fixed battery fixedly installed on the vehicle body, a portable battery detachably installed from the vehicle body, and a power supply device that supplies power from the fixed battery and the portable battery to the electric motor, The power supply device The fixed-installed battery and the portable battery are connected in parallel to supply power to the electric motor, and only the power from the fixed-installed battery is supplied to the electric motor (for example, SW1 of the power supply switch 107 is ON, SW2 is OFF, SW3 is OFF). If the difference between the voltage of the fixed-installed battery and the voltage of the portable battery exceeds a predetermined allowable value, the power supply to the electric device will be limited to either the fixed-installed battery or the portable battery (for example, SW1 → ON, SW2 → OFF, or SW1 → OFF, SW2 → ON of the power supply switch 107). It is characterized by the following:

[0011] Furthermore, the work vehicle according to the present invention comprises a drivable vehicle body, work equipment (for example, a slewing platform 20, boom 30, and work platform 40 in the embodiment) provided on the vehicle body, an electric motor (for example, a pump drive motor 53) for operating the work equipment, a fixed battery fixedly installed on the vehicle body, a portable battery detachably installed from the vehicle body, and a power supply device that supplies power from the fixed battery and the portable battery to the electric motor, wherein the power supply device is The fixed-installed battery and the portable battery are connected in parallel to supply power to the electric motor, and the electric motor can be supplied with power only from the fixed-installed battery (for example, SW1 → ON, SW2 → OFF, SW3 → OFF on the power supply switch 107), and when the remaining charge of the fixed-installed battery falls below a predetermined value, the power supplied to the electric motor can be switched from the fixed-installed battery to the portable battery (for example, SW1 → OFF, SW2 → ON, SW3 → OFF on the power supply switch 107), The system includes an alarm device (e.g., a controller 60) that activates an alarm when the remaining charge of the fixed-installed battery falls below a predetermined value while the power supply device is supplying power to the electric motor only from the fixed-installed battery. It is characterized by the following.

[0012] In the work vehicle with the above configuration, it is preferable that the portable battery is configured by connecting a plurality of battery units (for example, battery units 81a, 81b, 81c) that can be individually attached to and detached from the vehicle body in series. [Effects of the Invention]

[0013] According to the work vehicle of the present invention, a fixed-installation battery is provided that is fixedly installed on the vehicle body, and a portable battery is provided that is detachably installed from the vehicle body. The power supply device connects the fixed-installation battery and the portable battery in parallel to the electric device that operates the work device provided on the vehicle body. Both power sources simultaneously electric equipment Offering It is configured to allow power supply. With this configuration, the user can change the capacity of the battery supplying power to the electric device as needed by attaching and detaching the portable battery to the vehicle body.

[0014] Furthermore, in the work vehicle with the above configuration, the power supply device is capable of supplying power to the electric motor only from a fixed battery, and when the remaining charge of the fixed battery falls below a predetermined value, it is possible to switch the power supplied to the electric motor from the fixed battery to a portable battery. For example, if the remaining charge of the fixed battery falls below a predetermined value, the power supplied to the electric motor is switched to the portable battery, and work can be continued beyond the working time that can be achieved with the capacity of the fixed battery.

[0015] Furthermore, in a work vehicle with the above configuration, the power supply device can supply power from a fixed battery to the electric motor, while also supplying power from a portable battery to an electric drive device different from the electric motor. This allows for a longer continuous power supply compared to a case where power is supplied to both the electric motor and the electric drive device solely from a fixed battery.

[0016] Furthermore, in a work vehicle with the above configuration, if the difference between the voltage of the fixed battery and the portable battery exceeds a predetermined allowable value before the fixed battery and the portable battery are connected in parallel, the power supply device will allow only one of the fixed battery or the portable battery to be supplied to the electric motor. This prevents a large current from flowing from one of the fixed battery or the portable battery to the other, thus avoiding damage to the battery or conductive components.

[0017] In addition, in the work vehicle having the above-described configuration, since the portable battery is configured by connecting in series a plurality of battery units that can be individually attached to and detached from the vehicle body, among the portable batteries composed of a plurality of battery units, for example, one battery unit can be removed from the vehicle body and used as a power source for electric equipment adapted to the voltage of the single battery unit.

Brief Description of the Drawings

[0018] [Figure 1] It is a side view showing the left side surface of the aerial work vehicle which is one embodiment of the present invention. [Figure 2] It is a side view showing the right side surface of the above-described aerial work vehicle. [Figure 3] It is a block diagram showing a configuration related to the operation control of the above-described aerial work vehicle. [Figure 4] It is a block diagram showing each configuration of the fixed installation battery, the portable battery, and the power supply device in the above block diagram.

Mode for Carrying Out the Invention

[0019] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show the external side views of the aerial work vehicle 1 according to the present embodiment. FIG. 1 shows the left side surface facing the front of the aerial work vehicle 1, and FIG. 2 shows the right side surface facing the front of the aerial work vehicle 1. In addition, the same components as those in FIG. 1 in FIG. 2 are denoted by the same reference numerals, and detailed descriptions thereof are omitted. Hereinafter, the overall configuration of the aerial work vehicle 1 will be described with reference to these drawings.

[0020] As shown in Figures 1 and 2, the aerial work platform 1 is based on a truck vehicle that has a driver's cab 7 at the front of the vehicle body 2 and is propelled by a pair of left and right tires 5 arranged at the front and rear of the vehicle body 2. The tires 5 consist of front wheels 5F, which are the left front wheel 5Fl and the right front wheel 5Fr, and rear wheels 5R, which are the left rear wheel 5Rl and the right rear wheel 5Rr. The vehicle body 2 is composed of a vehicle frame consisting of a chassis frame on which the left front wheel 5Fl, the right front wheel 5Fr, the left rear wheel 5Rl, and the right rear wheel 5Rr are arranged, and a subframe mounted on this chassis frame.

[0021] The vehicle body 2 is equipped with jacking devices 10 on the front, rear, left, and right sides to lift and support the vehicle body 2 during work at height. The jacking devices 10 consist of a pair of front jacks 10F positioned behind the front wheels 5F and a pair of rear jacks 10R positioned behind the rear wheels 5R. Specifically, the left front jack 10Fl is positioned behind the left front wheel 5Fl, the right front jack 10Fr is positioned behind the right front wheel 5Fr, the left rear jack 10Rl is positioned behind the left rear wheel 5Rl, and the right rear jack 10Rr is positioned behind the right rear wheel 5Rr. Each jack 10F and 10R extends downward by driving a jack cylinder 11 located inside it, thereby lifting and supporting the vehicle body 2 and stabilizing the entire vehicle.

[0022] Furthermore, the left front jack 10Fl, the right front jack 10F, the left rear jack 10Rl, and the right rear jack 10Rr are each equipped with an outrigger device (not shown). Inside each outrigger device is an outrigger cylinder 12 (see Figure 3), and by extending or retracting the outrigger cylinder 12, the corresponding jack device 10 is moved horizontally in the width direction of the vehicle body 2 (from front to back / from back to front in Figure 1). Specifically, by extending the outrigger cylinder 12, the jack device 10 is moved from the side of the vehicle body 2. The jack device 10 is moved in a direction that extends outward. Additionally, by retracting the extended outrigger cylinder 12, the jack device 10 that extends outward from the side of the vehicle body 2 is moved in a direction that retracts it into the vehicle body 2. The rear end of the vehicle body 2 is provided with a lower operating device 27 for operating each jack device 10, the outrigger device, and the boom 30, which will be described later.

[0023] As shown in Figure 1, a loading space LS is provided on the underside of the left subframe of the vehicle body 2, between the left rear wheel 5Rl and the left rear jack 10Rl. Three portable batteries 80, which can be individually attached to and detached from the vehicle body 2, are installed in this loading space LS. Inside this loading space LS, two jack bases 13 (which are placed on the road surface to support the tip of the extendable jack device 10) and two wheel chocks 14 are housed in front of the portable batteries 80. In addition, two toolboxes 26 for storing work tools and equipment are provided on the left side of the vehicle body 2, stacked one above the other. The upper toolbox 26 has a door on its top surface, which opens upwards. In contrast, the lower toolbox 26 has a door on the front surface in Figure 1, with a hinge on the bottom of the door, which opens so that the top of the door tilts forward. A power unit 51, which houses a hydraulic pump 52 (see Figure 3) and a pump drive motor 53 (see Figure 3), is mounted below the left front jack 10Fl, at the rear and below the lower toolbox 26.

[0024] As shown in Figure 2, a loading space LS is provided on the right side of the vehicle body 2 and below the subframe, between the right rear wheel 5Rr and the right rear jack 10Rr. A fixed battery 70, secured to the vehicle body 2 by fasteners Fx, is installed in this loading space LS. Within this loading space LS, two jack bases 13 and one wheel chock 14 are housed in front of the fixed battery 70. Furthermore, a standard charging outlet 15 for connecting to an external AC 100V~200V power supply and a fast charging outlet 16 for connecting to an external fast charger are provided between the loading space LS where the fixed battery 70 is installed and the right rear jack 10Rr.

[0025] A muffler 17 is provided in front of the right rear wheel 5Rr, from which exhaust gases from the engine of the aerial work platform 1 are discharged. Furthermore, on the upper part of the subframe of the vehicle body 2, a cargo bed space is provided from behind the right front jack 10Fr to the position of the right rear wheel 5Rr, where construction tools such as safety cones and cone bars used at work sites can be loaded. Side panels 18 are attached to the sides of this cargo bed space so that they can be opened and closed.

[0026] As shown in Figure 1, a slewing platform 20 is provided on the subframe in the mounting area behind the driver's cab 7 of the vehicle body 2, which is driven by a slewing motor 24 and is configured to rotate horizontally around a vertical axis. The base end of a boom 30 is attached to a support column 21 extending upward from this slewing platform 20 via a foot pin 22 so that it can swing (raise and lower) in the vertical direction. The boom 30 has a configuration in which a base boom 30a, an intermediate boom 30b, and a tip boom 30c are nested together in order from the slewing platform 20 side, and the boom 30 can be extended and lowered in the axial direction (longitudinal direction) by driving the extension and retraction of a telescopic cylinder 31 provided inside. In addition, a luffing cylinder 23 is mounted between the base boom 30a and the support column 21, and by driving the extension and retraction of this luffing cylinder 23, the entire boom 30 can be raised and lowered in the vertical plane.

[0027] A vertical post (not shown) is pivotally supported at the tip of the tip boom 30c so as to be able to swing up and down. This vertical post is controlled to maintain a vertical position at all times, regardless of the luffing of the boom 30, by an upper leveling cylinder (not shown) straddling the tip of the tip boom 30c and a lower leveling cylinder 25 straddling the base boom 30a and the support column 21. A work platform 40 for worker use is attached to this vertical post via a work platform bracket (not shown). A swivel motor 34 (see Figure 3) is installed inside the ket, and by driving this swivel motor 34, the entire work platform 40 can be made to swivel (rotate horizontally) around the vertical post. Here, as described above, the vertical post is always kept in a vertical position, so as a result the floor surface of the work platform 40 is always kept horizontal regardless of the elevation angle of the boom 30.

[0028] The work platform 40 is equipped with an upper operating device 45 that includes various operating means such as operating levers, operating switches, and operating dials for operation by the worker riding on it. Therefore, the worker riding on the work platform 40 can perform various operations such as the rotation of the turntable 20 (rotation of the turntable motor 24), the luffing of the boom 30 (extension and retraction of the luffing cylinder 23), the extension and retraction of the boom 30 (extension and retraction of the extension cylinder 31), and the swivel operation of the work platform 40 (rotation of the swivel motor 34) by operating the upper operating device 45.

[0029] <Regarding the placement of the fixed-installation battery 70 and the portable battery 80> As described above, the fixed battery 70 and the portable battery 80 are installed between the rear wheel 5R and the rear jack 10R, respectively. Therefore, even if the vehicle body 2 is hit by another vehicle from the front, rear, or side, the fixed battery 70 and the portable battery 80 are protected by the rear wheel 5R and the rear jack 10R, making them less susceptible to damage. In particular, by arranging the fixed battery 70 and the portable battery 80 on the underside of the subframe, each battery is surrounded on three sides by the rear wheel 5R, the rear jack 10R, and the subframe, thus further enhancing the protection of each battery by these components.

[0030] Furthermore, by installing the fixed battery 70 and the portable battery 80 at a position lower than the subframe of the vehicle body 2, the center of gravity of the aerial work platform 1 can be lowered, thereby preventing a decrease in stability when the aerial work platform 1 is in motion. In addition, when an operator attaches or detaches the portable battery 80 to the vehicle body 2, the attachment and detachment work can be done while standing on the ground. In other words, since there is no need to climb up and down between the subframe of the vehicle body 2 and the ground while carrying the battery, which is heavy even though it is portable, the risks associated with the attachment and detachment work can be reduced.

[0031] Furthermore, as mentioned above, the door of the lower toolbox 26 opens so that the top part tilts forward. Therefore, when the aerial work platform 1 is parked along the road and work is performed, there is a high probability that space will be available to open and close the door of the lower toolbox 26. Consequently, by detachably installing the portable battery 80 on the side where the door of the lower toolbox 26 opens and closes (i.e., the left side of the vehicle body 2), there is a high probability that space will also be available for attaching and detaching the portable battery 80.

[0032] Furthermore, by installing the portable battery 80 on the side of the vehicle body opposite to the side facing oncoming traffic when the aerial work platform 1 is traveling on the road, i.e., on the left side of the vehicle body 2, when the aerial work platform 1 is parked along the road to perform the attachment and detachment of the portable battery 80, the risk of contact with oncoming traffic or vehicles passing by the parked vehicle is reduced, thus ensuring safety. This applies not only to work vehicles like the aerial work platform 1, but also to work vehicles that are parked along the road for work (for example, buses, trucks, garbage trucks, etc.).

[0033] Furthermore, for example, when performing work on equipment on a utility pole buried along a road using a high-altitude work vehicle 1, suppose the jack device 10 is extended to the left side of the vehicle body 2 (i.e., the opposite side of the oncoming lane) using the outrigger device, and the work platform 40 on which the worker is seated is brought closer to the utility pole to perform the work. If the portable battery 80 is removed from the vehicle body 2 at this time, the left side of the vehicle body 2 becomes lighter and its stability decreases, but this is less likely to happen if the right side of the vehicle body 2 (the stable side) becomes lighter during work. It is desirable to install the portable battery 80 on the left side so that the stability of the vehicle body 2 does not decrease easily.

[0034] Furthermore, the above applies when traffic regulations stipulate that vehicles must travel on the left side of the road. If the regulations stipulate that vehicles must travel on the right side of the road, it is desirable to install the portable battery 80 on the right side of the vehicle body 2 and the fixed battery 70 on the left side of the vehicle body 2.

[0035] Next, referring to Figure 3, we will describe the configuration for controlling the operation of each hydraulic actuator, including the jack cylinder 11, outrigger cylinder 12, slewing motor 24, luffing cylinder 23, telescopic cylinder 31, and swivel motor 34, based on the operation signals output by the operation of the upper operating device 45 or lower operating device 27 described above.

[0036] As shown in Figure 3, the aerial work platform 1 includes a hydraulic unit 50 that supplies hydraulic fluid to operate each of the hydraulic actuators described above, and a controller 60 that receives operation signals from the upper operating device 45 and the lower operating device 27 and controls the operation of each hydraulic actuator. The hydraulic unit 50 is configured to include a hydraulic pump 52 and a pump drive motor 53 housed in the power unit 51 shown in Figure 1, and a control valve 54 that controls the supply direction and amount of hydraulic fluid supplied from the hydraulic pump 52 to each hydraulic actuator.

[0037] The pump drive motor 53 is rotationally driven by power supplied from a power supply device 100 (described later), which operates the hydraulic pump 52 and discharges hydraulic fluid to the control valve 54. The control valve 54 includes an electromagnetic proportional control valve V1 corresponding to the jack cylinder 11, an electromagnetic proportional control valve V2 corresponding to the outrigger cylinder 12, an electromagnetic proportional control valve V3 corresponding to the slewing motor 24, an electromagnetic proportional control valve V4 corresponding to the luffing cylinder 23, an electromagnetic proportional control valve V5 corresponding to the telescopic cylinder 31, and an electromagnetic proportional control valve V6 corresponding to the swivel motor 34.

[0038] When an operation signal output by the operation of the upper operating device 45 or the lower operating device 27 is input to the controller 60, the controller 60 outputs a command signal corresponding to that operation signal to the control valve 54. Based on the command signal from the controller 60, the control valve 54 electromagnetically drives the spools of each electromagnetic proportional control valve V1 to V6 to control the supply direction and amount of hydraulic fluid supplied from the hydraulic pump 52 to each hydraulic actuator, and controls the operating direction and operating speed of each hydraulic actuator. As a result, the upper operating device 45 or the lower operating device 27 can perform operations such as the extension and retraction of the jack device 10 and outrigger device, the rotation of the turntable 20, the luffing and raising of the boom 30, the extension and retraction of the boom 30, and the swiveling of the work platform 40.

[0039] Furthermore, the controller 60 monitors the power supply device 100 and activates an alarm if any abnormality is detected in the power supply device 100. This alarm activation includes, for example, activating an alarm using an alarm lamp or alarm buzzer, and activating an alarm that restricts the operation of work equipment (e.g., jack device 10, turntable 20, boom 30, work platform 40, outrigger device, etc.).

[0040] The power supply device 100 is connected to the fixed battery 70, portable battery 80, normal charging outlet 15, and rapid charging outlet 16 shown in Figure 1, and supplies power from the normal charging outlet 15 and rapid charging outlet 16 to electric devices installed on the vehicle body 2, such as the pump drive motor 53. It also supplies power from the normal charging outlet 15 and rapid charging outlet 16 to the vehicle battery 61 via the fixed battery 70, portable battery 80, and DC-DC converter 104. The power supply device 100 outputs a DC voltage to the DC-AC inverter 63, which converts the DC voltage supplied from the power supply device 100 to AC 100V and outputs it from the service outlet 19 provided on the vehicle body 2.

[0041] Next, with reference to Figure 4, the configurations of the fixed-installation battery 70, the portable battery 80, and the power supply device 100 will be described. First, the fixed-installation battery 70 is configured by connecting lithium-ion batteries 71a and 71b in parallel. Each of the lithium-ion batteries 71a and 71b is configured by connecting three lithium-ion battery modules (hereinafter referred to as "battery modules") with an output voltage of V volts in series. As a result, the voltage of the lithium-ion batteries 71a and 71b is three times the output voltage V volts of the battery modules (V × 3). This voltage value is the voltage value of the power supply used in electric devices installed on the vehicle body 2, such as the pump drive motor 53.

[0042] The terminal voltage, input / output current, and temperature of lithium-ion batteries 71a and 71b are monitored by Cell Management Units (CMUs) 72a and 72b, respectively, and the CMUs 72a and 72b output the monitored terminal voltage, input / output current, and temperature values ​​to the battery management unit 73. If the terminal voltage, input / output current, and temperature values ​​of lithium-ion batteries 71a and 71b output from the CMUs 72a and 72b exceed (or fall below) the allowable values, the battery management unit 73 turns off the contactor 74, thereby cutting off the power supply from lithium-ion batteries 71a and 71b.

[0043] The portable battery 80 is composed of battery units 81a, 81b, and 81c. Each battery unit consists of one battery module (a lithium-ion battery module with the aforementioned output voltage of V volts) and a CMU. This CMU has the same functions as the CMUs 72a and 72b of the fixed-installation battery 70, and outputs the terminal voltage, input / output current, and temperature values ​​of the battery module to the power supply device 100. Note that battery unit 81a consists of battery module 82a and CMU 83a, battery unit 81b consists of battery module 82b and CMU 83b, and battery unit 81c consists of battery module 82c and CMU 83c.

[0044] Each battery unit houses a battery module and a CMU in a case. By connecting the connector attached to the case to the connector installed in the loading space LS shown in Figure 1, the battery module and CMU inside the case can be electrically connected to the power supply device 100. When battery units 81a, 81b, and 81c are electrically connected to the power supply device 100, these three battery units 81a, 81b, and 81c are connected in series within the power supply device 100. As a result, the voltage when battery units 81a, 81b, and 81c are connected in series becomes the same voltage (V × 3) as the lithium-ion batteries 71a and 71b of the fixed-installation battery 70.

[0045] In this way, by setting the individual voltage values ​​of battery units 81a, 81b, and 81c lower than the voltage value of the power supply used by the electric devices installed in the vehicle body 2, and by connecting multiple battery units in series to achieve the voltage value used by the electric devices, the battery units 81a, 81b, and 81c can be reused in other work vehicles equipped with electric devices that use different voltage values. For example, if an electric device installed in a work vehicle operates at a voltage value of (V × 2), then two of the battery units 81a, 81b, and 81c can be used to operate the electric device installed in that work vehicle.

[0046] The terminal voltage, input / output current, and temperature values ​​of the battery modules, monitored by the CMUs 83a, 83b, and 83c of battery units 81a, 81b, and 81c respectively, are power supply values. The output is sent to the battery management unit 108 of device 100. The battery management unit 108 turns off the contactor 109 and cuts off the power supply from battery units 81a, 81b, and 81c if the terminal voltage, input / output current, and temperature values ​​of each battery module output from CMU 83a, 83b, and 83c exceed (or fall below) the allowable values.

[0047] Power supplied from the fixed battery 70 and the portable battery 80 is output to the power supply switch 107 of the power supply device 100. The power supply switch 107 switches the power supply configuration from the fixed battery 70 and the portable battery 80 according to three types of power supply modes: parallel connection mode, battery switching mode, and external supply mode. The relationship between the power supply modes and the power supply configuration will be explained in detail later. The power output from the power supply switch 107 is to terminal 103 and the DC-AC inverter 63, and the power output from the power supply switch 107 to terminal 103 is supplied to the AC controller 106 via the DC-DC converter 104 and the contactor 105.

[0048] The DC-DC converter 104 converts the voltage value of the power supplied from terminal 103 to the charging voltage of the vehicle battery 61 and supplies it to the vehicle battery 61 installed in the aerial work platform 1 in order to charge the vehicle battery 61. The vehicle battery 61 also provides power to the vehicle controller 62, battery management unit 73, charging voltage control device 102, and battery management unit 108, in addition to the electrical equipment installed in the aerial work platform 1 (indicated by white arrows in Figure 4). The AC controller 106 converts the power supplied from terminal 103 into AC power and controls the rotational speed and torque of the pump drive motor 53 by changing the frequency and voltage of the AC power.

[0049] The AC 100V to 200V power supplied from the standard charging outlet 15 is output to the charger 101 of the power supply device 100. The charger 101 outputs a charging voltage to terminal 103 at a voltage value specified by a command value from the charging voltage control device 102. In this embodiment, the charging voltage control device 102 outputs a command value to the charger 101 that results in a charging voltage (V × 3) for charging the fixed-installed battery 70 and the portable battery 80. The charging voltage supplied from an external rapid charger to the rapid charging outlet 16 is output to terminal 103.

[0050] Normally, the contactor 105 is on, and the power input to terminal 103 is supplied to the AC controller 106. However, while a charging voltage is supplied from the normal charging outlet 15 or the fast charging outlet 16, the vehicle controller 62 turns off the contactor 105, so these charging voltages are not supplied to the AC controller 106.

[0051] <Regarding power supply methods according to the power supply mode> As mentioned above, the power supply switch 107 switches the power supply configuration to correspond to three types of power supply modes, and this switching of the supply configuration is achieved by on / off control of single-pole single-throw switches SW1, SW2, and SW3. Here, one terminal of switch SW1 is connected to the fixed-installation battery 70 (more specifically, contactor 74), and the other terminal is connected to terminal 103. Also, one terminal of switch SW2 is connected to the portable battery 80 (more specifically, contactor 109), and the other terminal is connected to terminal 103. Furthermore, one terminal of switch SW3 is connected to the portable battery 80 (more specifically, contactor 109), and the other terminal is connected to the DC-AC inverter 63. Note that switch SW1 can be replaced with contactor 74, and switch SW3 can be replaced with contactor 109, thereby allowing switches SW1 and SW3 to be omitted. The on / off states of switches SW1, SW2, and SW3 corresponding to each power supply mode will be described below.

[0052] (Parallel connection mode) When the user selects the parallel connection mode, the power supply switch 107 turns on switches SW1 and SW2 and off switch SW3. As a result, power is supplied to the AC controller 106 via terminal 103 with the fixed battery 70 and the portable battery 80 connected in parallel. Therefore, the battery capacity becomes the sum of the capacity of the fixed battery 70 and the capacity of the portable battery 80, resulting in a power supply configuration suitable when a larger battery capacity is required.

[0053] Furthermore, when this mode is selected, the voltage values ​​of the fixed battery 70 and the portable battery 80 are monitored, and if the difference between the two voltage values ​​exceeds a predetermined allowable range, either switch SW1 or SW2 is turned off, so that power is supplied to terminal 103 only from either the fixed battery 70 or the portable battery 80. By performing such control, the risk of a large current flowing from one of the two batteries to the other due to the voltage difference between the two batteries, which could damage the batteries or conductive components, can be reduced. In addition, if the difference between the voltage values ​​of the fixed battery 70 and the portable battery 80 exceeds the allowable range, the power supply device 100 may notify the controller 60 that an abnormality has occurred, and the controller 60 may activate an alarm.

[0054] (Battery switching mode) When the user selects the battery switching mode, the power supply switch 107 first turns on switch SW1 and then turns off switches SW2 and SW3. As a result, initially only the fixed battery 70 supplies power to the AC controller 106 via terminal 103. During this time, the vehicle controller 62 monitors the remaining battery level of the fixed battery 70 based on communication information from the battery management unit 73 and the battery management unit 108. When the remaining battery level of the fixed battery 70 falls below a predetermined value, switch SW1 is turned off and switch SW2 is turned on. As a result, the battery supplying power to the AC controller 106 via terminal 103 switches from the fixed battery 70 to the portable battery 80.

[0055] When this mode is selected, for example, if the remaining charge of the fixed-installation battery 70 falls below a predetermined value, the power supplied to the AC controller 106 is switched to the portable battery 80, allowing power to be continuously supplied to the AC controller 106 beyond the working time achievable with the capacity of the fixed-installation battery 70. Furthermore, if the remaining charge of the portable battery 80 also falls below a predetermined value, power can be continuously supplied by replacing the battery units 81a, 81b, and 81c with other charged battery units.

[0056] In this mode, when the battery level of the fixed-installed battery 70 falls below a predetermined value, the power supply battery may be switched from the fixed-installed battery 70 to the portable battery 80. In this case, when the battery level of the fixed-installed battery 70 falls below a predetermined value, the power supply device 100 may notify the controller 60 of this, and the controller 60 may activate an alarm to inform the operator that the battery level of the fixed-installed battery 70 has fallen below a predetermined value.

[0057] (External supply mode) When the user selects the external power supply mode, the power supply switch 107 turns on switches SW1 and SW3 and off switch SW2. This causes the fixed-installation battery 70 to supply power to the AC controller 106 via terminal 103, and the portable battery Battery 80 will supply power to the DC-AC inverter 63. In this mode, since the battery supplying power to the AC controller 106 and the battery supplying power to the DC-AC inverter 63 are independent of each other, power can be supplied continuously for a longer period of time compared to when power is supplied to the AC controller 106 and the DC-AC inverter 63 only from the fixed battery 70.

[0058] In the above embodiment, the power supply switch 107 controlled the on / off state of switches SW1, SW2, and SW3 according to the power supply mode selected by the user. However, the user may manually switch the on / off state of switches SW1, SW2, and SW3 to achieve their desired power supply mode. Furthermore, it is not necessary to perform switching control according to all three power supply modes; the system may be configured to allow switching control between any two of these power supply modes.

[0059] Furthermore, if only one of the three power supply modes needs to be implemented, unnecessary switches can be omitted. For example, if only the parallel connection mode needs to be implemented, switches SW1, SW2, and SW3 can be eliminated, and the fixed battery 70 and the portable battery 80 can be connected in parallel by wiring and then connected to terminal 103. If the battery capacity needs to be reduced in this configuration, the portable battery 80 can be removed from the vehicle body 2. Similarly, if only the external supply mode needs to be implemented, switches SW1, SW2, and SW3 can be eliminated, and the fixed battery 70 can be connected to terminal 103 by wiring, and the portable battery 80 can be connected to the DC-AC inverter 63.

[0060] In the above embodiment, a truck-mounted aerial work platform was used as an example of the vehicle (work vehicle) according to the present invention, but the invention is not limited thereto. For example, it may also be applied to other work vehicles such as garbage trucks and crane trucks, or transport vehicles such as buses and dump trucks. [Explanation of Symbols]

[0061] 1. Aerial work platform 2 car bodies 5 Tire Wheels 10 Jacking device 10R Rear Jack 20 Turntables 30 Boom 40 workbenches 52 Hydraulic pump 53 Pump drive motor 60 Controllers 70 Fixed-installation batteries 80 Portable Battery 81a, 81b, 81c Battery Unit 100 Power supply equipment 107 Power supply switch

Claims

1. A work vehicle comprising: a drivable vehicle body; a work device mounted on the vehicle body; an electric device for operating the work device; a fixed battery fixedly installed on the vehicle body; a portable battery detachably installed from the vehicle body; and a power supply device for supplying power from the fixed battery and the portable battery to the electric device, The power supply device is characterized by the ability to connect the fixed battery and the portable battery in parallel to the electric motor simultaneously.

2. The power supply device is capable of supplying power to the electric motor only from the fixed battery, and when the remaining charge of the fixed battery falls below a predetermined value, it is capable of switching the power supplied to the electric motor from the fixed battery to the portable battery, as described in claim 1.

3. A work vehicle comprising: a drivable vehicle body; a work device provided on the vehicle body; an electric device for operating the work device; a fixed battery fixedly installed on the vehicle body; a portable battery detachably installed from the vehicle body; and a power supply device for supplying power from the fixed battery and the portable battery to the electric device, The aforementioned power supply device is The fixed-installation battery and the portable battery are connected in parallel to supply power to the electric motor. The electric motor can be supplied with power only from the fixed-installation battery, and when the remaining charge of the fixed-installation battery falls below a predetermined value, the power supplied to the electric motor can be switched from the fixed-installation battery to the portable battery. A work vehicle characterized by supplying power from the fixed-installation battery to the electric motor, and being able to supply power from the portable battery to an electric drive device different from the electric motor.

4. A work vehicle comprising: a drivable vehicle body; a work device provided on the vehicle body; an electric device for operating the work device; a fixed battery fixedly installed on the vehicle body; a portable battery detachably installed from the vehicle body; and a power supply device for supplying power from the fixed battery and the portable battery to the electric device, The aforementioned power supply device is The fixed-installation battery and the portable battery are connected in parallel to supply power to the electric motor. A work vehicle characterized in that, when the difference between the voltage value of the fixed-installed battery and the voltage value of the portable battery exceeds a predetermined allowable value, it is possible to supply power to the electric device from only one of the fixed-installed battery or the portable battery.

5. A work vehicle comprising: a drivable vehicle body; a work device provided on the vehicle body; an electric device for operating the work device; a fixed battery fixedly installed on the vehicle body; a portable battery detachably installed from the vehicle body; and a power supply device for supplying power from the fixed battery and the portable battery to the electric device, The aforementioned power supply device is The fixed-installation battery and the portable battery are connected in parallel to supply power to the electric motor. The electric motor can be supplied with power only from the fixed-installation battery, and when the remaining charge of the fixed-installation battery falls below a predetermined value, the power supplied to the electric motor can be switched from the fixed-installation battery to the portable battery. A work vehicle characterized by being equipped with an alarm device that activates an alarm when the remaining charge of the fixed-installed battery falls below a predetermined value while the power supply device is supplying only the power of the fixed-installed battery to the electric motor.

6. The work vehicle according to any one of claims 1 to 5, characterized in that the portable battery is configured by connecting a plurality of battery units that can be individually attached to and detached from the vehicle body in series.

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