Work machine

Abstract

This invention ensures safety during inspections and reduces the risk of battery cell damage due to collisions with obstacles. The work machine (100) includes: a battery cell (1), a relay unit (2), and a safety device (12). The battery cell (1) transmits and receives power between itself and an electrical device (600). The relay unit (2) relays the transmission and reception of power. The safety device (12) is a device for detecting whether the circuit (10) between the battery cell (1) and the relay unit (2) is interrupted. When the circuit (10) is interrupted, the transmission and reception of power are stopped. At least a portion of the safety device (12) is positioned above the battery cell (1).

Description

Technical Field

[0001] This invention relates to work machinery. Background Technology

[0002] Previously, it was known to be a type of work machinery equipped with a safety device that stops the energization of a cable upon disconnection. For example, in the electric hydraulic excavator of Patent Document 1, the battery circuit is cut off by pulling out the maintenance plug, and the battery cell becomes de-energized. The maintenance plug is configured to protrude rearward from the battery cell and protrude to the outside.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2020-45631

[0004] However, in Patent Document 1, the maintenance plug is highly likely to break in the event of a collision between an obstacle and the rear of the electric hydraulic excavator (operating machinery). Therefore, even with the maintenance plug unplugged, the battery cell may not be de-energized, reducing safety during inspection. Furthermore, the battery cell may be damaged due to the insertion of the maintenance plug, etc. Summary of the Invention

[0005] In view of the above-mentioned situation, the present invention aims to achieve safety during inspection and reduce the risk of battery cell damage caused by collisions with obstacles.

[0006] To achieve the above objectives, one embodiment of the present invention includes a working machine comprising: a battery unit, a relay unit, and a safety device. The battery unit transmits and receives power between itself and electrical equipment. The relay unit relays the transmission and reception of power. The safety device is a means for detecting whether the circuit between the battery unit and the relay unit has been interrupted. If the circuit is interrupted, the transmission and reception of power are stopped. At least a portion of the safety device is disposed above the battery unit.

[0007] Other features and advantages of the present invention will become clearer from the embodiments shown below.

[0008] According to the present invention, safety can be achieved during inspections and the risk of battery cell damage caused by collisions with obstacles can be reduced. Attached Figure Description

[0009] Figure 1 This is a simplified side view showing a structural example of the hydraulic excavator according to this embodiment.

[0010] Figure 2 It is a block diagram that schematically represents the structure of the electrical and hydraulic systems of a hydraulic excavator.

[0011] Figure 3 This is a cross-sectional view showing an example of the internal structure of the engine compartment.

[0012] Figure 4 It is a 3D view of the interior of the engine compartment.

[0013] Explanation of reference numerals in the attached figures

[0014] 100...Hydraulic excavator (operating machinery); 200...Lower traveling body; 201...Crawler; 202...Travel motor; 300...Working machine; 301...Boom; 302...Stick; 303...Bucket; 304...Boom cylinder; 305...Stick cylinder; 306...Bucket cylinder; 400...Upper slewing body; 401...Control unit; 4011...Driver's seat; 4012...Stick; 402...Hand frame; 403...Slewing motor; 404...Engine compartment; 405...Engine hood; 4051...Opening 4052... Engine hood; 600... Electrical equipment; 601... Electric motor; 602... Charger; 603... Inverter; 611... DC-DC converter; 612... System controller; 613... Lead-acid battery; 701... Hydraulic pump; 702... Hydraulic hose; 703... Memory; 704... Piping; 705... Control valve; 706... Hydraulic actuator; 1... Battery cell; 10... Circuit; 11... Cable; 12... Maintenance plug; 2... Relay unit; 3... Power distribution unit. Detailed Implementation

[0015] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a simplified side view showing a structural example of the hydraulic excavator 100 according to this embodiment. Figure 2 This is a block diagram schematically illustrating the structure of the electrical and hydraulic systems of a hydraulic excavator 100. The hydraulic excavator 100 is an example of the "operating machinery" of this invention.

[0016] <1. Hydraulic Excavator 100>

[0017] The hydraulic excavator 100 includes a lower traveling body 200, a working body 300, and an upper slewing body 400. In this embodiment, the upper slewing body 400 (especially the engine compartment 404 described later) is sometimes referred to as the "body".

[0018] Furthermore, the directions in this disclosure are defined as follows. First, in the upper rotating body 400, the direction from the front side and the back side of the driver's seat 4011 (described later) where the operator (manipulator, driver) sits is directed towards the other is defined as the "forward direction". Within the "forward direction", the direction from the back side of the driver's seat 4011 to the front side is defined as "forward", and the direction from the front side of the driver's seat 4011 to the back side is defined as "rearward". Therefore, when the upper rotating body 400 is not rotating relative to the lower traveling body 200 (rotation angle 0°), the forward direction of the upper rotating body 400 is consistent with the forward and backward direction of the lower traveling body 200.

[0019] In addition, when looking forward from the rear, the direction from the left or right side of the driver's seat 4011 towards the other is defined as the "left and right direction". In the left and right direction, the direction towards the left side of the driver's seat 4011 is defined as the "left direction", and the direction towards the right side of the driver's seat 4011 is defined as the "right direction".

[0020] Furthermore, the direction from one of the lower traveling body 200 and the upper rotating body 400 toward the other is defined as the "vertical direction". Within the vertical direction, the direction from the lower traveling body 200 toward the upper rotating body 400 is defined as "upper", and the direction from the upper rotating body 400 toward the lower traveling body 200 is defined as "lower". Therefore, when the hydraulic excavator 100 is positioned on a horizontal plane with the vertical direction as its normal, its vertical direction is consistent with the vertical direction. Furthermore, "upper" aligns with "vertically above", and "lower" aligns with "vertically below".

[0021] The front-back, left-right, and up-down directions are perpendicular to each other.

[0022] However, the above definition of direction is used for illustrative purposes only and is not intended to limit actual positional relationships and directions.

[0023] <1-1. Lower traveling body 200>

[0024] The lower traveling body 200 has a pair of left and right tracks 201 and a pair of left and right travel motors 202. Each travel motor 202 is a hydraulic motor. The left and right travel motors 202 drive the left and right tracks 201 respectively, so that the hydraulic excavator 100 can move forward and backward in the front-rear direction.

[0025] <1-2. Worker 300>

[0026] The work machine 300 includes a boom 301, a stick 302, and a bucket 303. By individually driving the boom 301, stick 302, and bucket 303, it can perform excavation operations such as digging sand and soil. The boom 301 rotates via a boom cylinder 304. The base end of the boom cylinder 304 is supported on the front of the upper rotating body 400, and the boom cylinder 304 is freely movable. The stick 302 rotates via a stick cylinder 305. The base end of the stick cylinder 305 is supported on the boom 301, and the stick cylinder 305 is freely movable. The bucket 303 rotates via a bucket cylinder 306. The base end of the bucket cylinder 306 is supported on the stick 302, and the bucket cylinder 306 is freely movable. The boom cylinder 304, stick cylinder 305, and bucket cylinder 306 are all hydraulic cylinders.

[0027] <1-3. Upper Rotating Body 400>

[0028] The upper rotating body 400 is located above the lower traveling body 200 and is configured to rotate relative to the lower traveling body 200 via a slewing bearing (not shown). The upper rotating body 400 includes: an operating unit 401, a body frame 402, a slewing motor 403, an engine compartment 404, and an engine hood 405. A driver's seat 4011 is arranged in the operating unit 401. Various levers 4012 are arranged around the driver's seat 4011. The operator sits in the driver's seat 4011 and operates the levers 4012, thereby activating the hydraulic actuator 706 (see reference). Figure 2 The hydraulic excavator 100 is driven by the hydraulic motor 403. Thus, the excavator 100 can perform tasks such as driving the lower traveling body 200, digging based on the work machine 300, and rotating the upper slewing body 400. The body frame 402 is a plate-shaped structure extending vertically in the vertical direction. The control unit 401, the slewing motor 403, and various devices mounted in the engine compartment 404 are mounted on the body frame 402. The engine cover 405 is a housing containing the engine compartment 404 and is located below the control unit 401. The engine cover 405, along with the pedals of the control unit 401 and the body frame 402, covers the engine compartment 404. The upper slewing body 400 rotates via a slewing bearing driven by the slewing motor 403, which functions as a hydraulic motor.

[0029] Furthermore, the engine hood 405 of the hydraulic excavator 100 has an opening 4051 and an engine cover 4052. The opening 4051 is a window for observing the interior of the engine compartment 404, and is located in the center of the rear part of the upper rotating body 400 in the left-right direction. The engine cover 4052 can be attached to and detached from the opening 4051, and can cover the opening 4051 by installation. In addition, in this disclosure, "attachable and detachable" means that it can be installed and removed.

[0030] In addition, the upper rotating body 400 also includes: a battery unit 1, a relay unit 2, a power distribution unit (PDU) 3, an electric motor 601, a charger 602, an inverter 603, a DC-DC converter 611, a system controller 612, and a lead-acid battery 613. Furthermore, the upper rotating body 400 also includes: a hydraulic pump 701, hydraulic hoses 702, a reservoir 703, piping 704, a control valve 705, and a hydraulic actuator 706. All of these are housed within the engine compartment 404.

[0031] Furthermore, the hydraulic excavator 100 may also be a structure that combines hydraulic equipment such as a hydraulic actuator 706 with an electrically driven actuator. Examples of electrically driven actuators include electric travel motors, electric cylinders, and electric swing motors.

[0032] Figure 3 This is a cross-sectional view showing an example of the internal structure of engine compartment 404. Figure 4 This is a 3D view of the interior of engine compartment 404. Additionally, Figure 3 Showing contains Figure 1 The cross-sectional structure of the engine compartment 404 is formed by imaginary cutting through the double-dotted line III-III on a plane perpendicular to the vertical direction. Figure 4 View the interior of engine compartment 404 from above and diagonally downward.

[0033] <1-3-1. Structure of Electrical Systems>

[0034] Battery cell 1 is composed, for example, of a rechargeable battery such as a lithium-ion battery, and transmits and receives power between battery cell 1 and a specified electrical device 600. The specified electrical device 600 includes, for example, an electric motor 601, a charger 602, and an inverter 603. For example, battery cell 1 supplies power to charger 602 and electric motor 601. Battery cell 1 can be composed of multiple battery modules or a single battery module. However, it is not limited to the above example; electrical device 600 may also include devices other than electric motor 601, charger 602, and inverter 603.

[0035] The electric motor 601 consists of a permanent magnet motor, an induction motor, etc., and drives the hydraulic pump 701. The electric motor 601 receives power from the battery unit 1 via the relay unit 2 and the inverter 603. The electric motor 601 is supported on the body frame 402 by vibration-damping support components.

[0036] Charger 602 converts AC voltage supplied from a commercial power source via a power cable (not shown) into DC voltage and outputs it to battery cell 1, inverter 603, etc.

[0037] Inverter 603 converts the DC voltage supplied from battery cell 1 or charger 602 into AC voltage and supplies it to electric motor 601. As a result, electric motor 601 rotates. The supply of AC voltage (current) from inverter 603 to electric motor 601 is based on rotation commands output from system controller 612.

[0038] Relay unit 2 is configured to include charger relays, inverter relays, fuses, etc., and is also called a junction box. Relay unit 2 relays the transmission and reception of power between battery unit 1 and the aforementioned electrical equipment 600. For example, the voltage output from charger 602 is supplied to battery unit 1 via relay unit 2 and power distribution unit 3. Furthermore, the voltage output from battery unit 1 is supplied to inverter 603 via power distribution unit 3 and relay unit 2.

[0039] The relay unit 2 is electrically connected to the battery unit 1 via circuit 10. In this embodiment, circuit 10 includes a cable 11, a maintenance plug 12, and a power distribution unit 3. The cable 11 is a wiring that electrically connects the power distribution unit 3 to the relay unit 2. The maintenance plug 12 is a connector for electrically connecting one end of the cable 11 to the relay unit 2, and is disposed at one end of the cable 11. The maintenance plug 12 is detachably connected to the relay unit 2, electrically connecting one end of the cable 11 to the relay unit 2. The other end of the cable 11 is connected to the power distribution unit 3. The power distribution unit 3 distributes the power from the battery unit 1 to various structural elements, such as outputting (distributing) the power of the battery unit 1 to the other end of the cable 11.

[0040] Furthermore, the maintenance plug 12 is an example of the "safety device" of the present invention, and functions as a safety device for detecting whether the circuit 10 between the battery unit 1 and the relay unit 2 has been disconnected. Thus, the safety device can be configured with a simple structure. Details of this function of the maintenance plug 12 will be explained later.

[0041] Preferably, the cable 11 is routed through the lower side of the battery cell 1. This allows the cable 11 to be routed in a portion of the upper rotating body 400 where the likelihood of it colliding with obstacles during operation is low. Therefore, the possibility of the cable 11 breaking can be suppressed. However, this example does not preclude a structure in which the cable 11 does not pass through the lower side of the battery cell 1.

[0042] The power distribution unit 3 is a battery control unit that controls the internal battery relay, thereby controlling the power input and output of the battery unit 1. Preferably, as in this embodiment, the power distribution unit 3 is positioned forward of the battery unit 1. This allows for the optimal configuration of a power supply unit including the battery unit 1 and the power distribution unit 3. Furthermore, the high-voltage power distribution unit 3 can be positioned in a part of the upper rotating body 400 where the possibility of damage from collisions with obstacles during operation is minimal.

[0043] DC-DC converter 611 steps down the high voltage (e.g., 300V) DC voltage supplied from battery cell 1 via relay unit 2 to a low voltage (e.g., 12V). The voltage output from DC-DC converter 611, together with the output from lead battery 613, is supplied to system controller 612, etc.

[0044] The system controller 612 consists of an electronic control unit, also known as an ECU (electronic control unit), which controls the various structural elements of the hydraulic excavator 100.

[0045] The lead-acid battery 613 outputs a low-voltage (e.g., 12V) DC voltage. The output from the lead-acid battery 613 is supplied as a control voltage to, for example, a system controller 612.

[0046] <1-3-2. Structure of Hydraulic Systems>

[0047] The hydraulic pump 701 is driven by the electric motor 601, supplying working oil to the hydraulic motor and hydraulic cylinder. The hydraulic motor includes, for example, left and right travel motors 202 and swing motors 403. The hydraulic cylinder includes, for example, boom cylinder 304, stick cylinder 305, and bucket cylinder 306. Furthermore, the hydraulic motor and hydraulic cylinder driven by the working oil supplied from the hydraulic pump 701 are collectively referred to as the hydraulic actuator 706.

[0048] Hydraulic pump 701 is connected to reservoir 703 via hydraulic hose 702. Reservoir 703 is a working oil tank that contains (stores) working oil. Additionally, hydraulic pump 701 is connected to control valve 705 via piping 704. Thus, hydraulic pump 701 can supply working oil to control valve 705. Control valve 705 has multiple directional switching valves to control the flow (flow direction and flow rate, etc.) of the working oil pumped from hydraulic pump 701. For example, control valve 705 supplies this working oil to hydraulic actuator 706, etc.

[0049] When the hydraulic pump 701 is driven by the electric motor 601, the working oil in the reservoir 703 is supplied to the hydraulic actuator 706 via the control valve 705. As a result, the hydraulic actuator 706 is driven.

[0050] The hydraulic pump 701 can be a variable capacity pump or a fixed capacity pump. Furthermore, in this embodiment, the number of hydraulic pumps 701 is singular. However, it is not limited to this example, and the number of hydraulic pumps 701 can also be plural.

[0051] <1-4. Maintenance plug 12>

[0052] As described above, the maintenance plug 12 is a device used to detect whether the circuit 10 between the battery unit 1 and the relay unit 2 has been disconnected. Based on the detection result, the device checks whether the transmission and reception of power between the battery unit 1 and the electrical equipment 600 is possible.

[0053] In detail, when the circuit 10 between battery cell 1 and relay unit 2 is disconnected, the transmission and reception of power between battery cell 1 and electrical equipment 600 cease. Therefore, when the circuit 10 is disconnected, not only is the circuit 10 de-energized, but voltage is also prevented from being applied to it. This prevents the possibility of electric shock to personnel during inspections, maintenance, etc. Conversely, when the circuit 10 is maintained, power can be transmitted and received.

[0054] The system controller 612 detects the connection between the maintenance plug 12 and the relay unit 2 based on the state of the maintenance plug 12, thereby determining whether the circuit 10 is disconnected. Furthermore, the form in which the maintenance plug 12 functions as a safety device is not particularly limited. For example, a protrusion may be provided on one side of the maintenance plug 12 and the relay unit 2, and a recess on the other side through which the protrusion can be inserted. In this case, the system controller 612 detects the disconnection of the maintenance plug 12 from the relay unit 2 (that is, the disconnection of the circuit 10) by detecting the protrusion being pulled out of the recess.

[0055] Additionally, relay unit 2 includes circuit breaker 21. In this embodiment, circuit breaker 21 includes a relay circuit. If system controller 612 detects that maintenance plug 12 has become disconnected from relay unit 2 (i.e., circuit 10 has been cut off), it cuts off the relay circuit of circuit breaker 21, the relay circuit within relay unit 2, and the like. Furthermore, the relay circuit within relay unit 2 is configured in various circuits connected to charger 602, inverter 603, DC-DC converter 611, etc. Thus, the electrical connection between maintenance plug 12 (in other words, one end of cable 11) and relay unit 2 is cut off. On the other hand, if system controller 612 does not detect the disconnection of maintenance plug 12 from relay unit 2 (i.e., circuit 10 has been cut off), it maintains the aforementioned electrical connection.

[0056] Preferably, at least a portion of the maintenance plug 12 is positioned above the battery cell 1. This allows the hydraulic excavator 100 to operate safely during inspections and maintenance, and reduces the risk of damage to the battery cell 1 due to collisions with obstacles.

[0057] For example, if the upper rotating body 400 collides with an obstacle during operation, it is typically impacted in a direction perpendicular to the vertical direction. Therefore, by positioning at least a portion of the maintenance plug 12 above the battery cell 1, the possibility of the maintenance plug 12 breaking due to contact with the battery cell 1 during the aforementioned collision can be suppressed or prevented. Consequently, during post-collision inspections, the maintenance plug 12 (especially as a safety device) can easily function properly. This improves the safety of inspection and maintenance operations.

[0058] Furthermore, even if the upper rotating body 400 collides with an obstacle as described above, deformation of the battery cell 1 caused by contact with the impacted maintenance plug 12 can be suppressed or prevented. For example, when the maintenance plug 12 is positioned entirely above the battery cell 1 in the vertical direction, the battery cell 1 can avoid contact with the maintenance plug 12, thus preventing damage. Additionally, even if a portion (lower part, etc.) of the impacted maintenance plug 12 overlaps with the battery cell 1 in a direction perpendicular to the vertical direction, this portion only contacts the end (e.g., the upper end) of the battery cell 1. Therefore, the possibility of damage to the main part (e.g., the battery module) of the battery cell 1 due to this contact can be reduced.

[0059] Furthermore, when cable 11 is electrically connected to relay unit 2, maintenance plug 12 can be detachably installed on relay unit 2. Here, when maintenance plug 12 is disconnected from relay unit 2, for example by cutting off the electrical connection via circuit breaker 21, the transmission and reception of power between battery unit 1 and electrical equipment 600 is stopped. In this way, safety can be ensured during inspection, maintenance, etc., through a simple structure.

[0060] Preferably, as in this embodiment, the relay unit 2 is positioned above the battery unit 1. This prevents either the battery unit 1 or the relay unit 2 from being pushed into the other even if the upper rotating body 400 collides with an obstacle during operation. Therefore, the risk of damage to the battery unit 1 and the relay unit 2 can be reduced.

[0061] In this embodiment, one end of the cable 11 (i.e., the maintenance plug 12) is routed to the engine cover 4052 side of the battery unit 1. The engine cover 4052 covers both the battery unit 1 and the maintenance plug 12. In this case, the engine cover 4052 is positioned rearward of the battery unit 1, spaced apart from the maintenance plug 12. For example, as... Figure 3 As shown, the engine cover 4052 and the maintenance plug 12 are positioned opposite each other in the front-to-back direction with a gap between them. The configuration of the engine cover 4052 prevents external forces from acting on the battery cell 1 and the maintenance plug 12. Furthermore, during inspections, etc., operators can immediately access the maintenance plug 12 by removing the engine cover 4052. Therefore, both the safety of the battery cell 1 and the maintenance plug 12 and the ease of inspection and maintenance are considered.

[0062] <2. Remarks>

[0063] The embodiments of the present invention have been described above. Furthermore, those skilled in the art will understand that the above embodiments are illustrative and various modifications can be made to the combination of each structural element and each processing step, and these modifications are all within the scope of the present invention.

[0064] For example, in the above embodiments, a hydraulic excavator 100, which is a construction machine, was described as an example of the "operating machinery" of the present invention. However, this example does not preclude the application of the present invention to structures of operating machinery other than the hydraulic excavator 100. For example, the "operating machinery" of the present invention may be other construction machinery such as wheel loaders, or agricultural machinery such as combine harvesters and tractors.

[0065] Furthermore, in the above-described embodiments, the "safety device" of the present invention is a function of the maintenance plug 12. However, it is not limited to this example, and the "safety device" of the present invention may also be a structural element different from the maintenance plug 12.

[0066] <3. Summary>

[0067] The following is a summary description of the implementation methods described above.

[0068] For example, the operating machine 100 disclosed in this specification has the following structure (first structure), namely, it has:

[0069] Battery unit 1, which transmits and receives power between the battery unit 1 and the electrical device 600;

[0070] Relay unit 2 relays the transmission and reception of the aforementioned power; and

[0071] Safety device 12 is used to detect whether the circuit 10 between the battery unit 1 and the relay unit 2 has been disconnected.

[0072] When the aforementioned circuit 10 is disconnected, the transmission and reception of power cease.

[0073] At least a portion of the aforementioned safety device 12 is positioned above the aforementioned battery cell 1.

[0074] The operating machinery 100 of the first structure described above can also be of the following structure (second structure), namely,

[0075] The aforementioned safety device 12 can be detachably installed on the aforementioned relay unit 2.

[0076] When the aforementioned safety device 12 is disconnected from the aforementioned relay unit 2, the transmission and reception of the aforementioned power are stopped.

[0077] Alternatively, the operating machine 100 with the first or second structure described above can also have the following structure (third structure), namely,

[0078] The relay unit 2 is positioned above the battery unit 1.

[0079] In addition, the working machine 100 of any of the first to third structures mentioned above can also be the following structure (fourth structure), that is,

[0080] The circuit 10 includes a cable 11 with the safety device 12 disposed at one end.

[0081] Alternatively, the operating machine 100 of the fourth structure mentioned above can also be of the following structure (the fifth structure), namely,

[0082] It also includes an engine cover 4052 that covers the aforementioned battery cell 1 and the aforementioned safety device 12 and is removable.

[0083] One end of the aforementioned cable 11 is routed to the engine hood 4052 side of the aforementioned battery unit 1.

[0084] The aforementioned engine cover 4052 is positioned at a distance from the aforementioned safety device 12, located further back than the aforementioned battery unit 1.

[0085] In addition, the operating machinery 100 of the fourth or fifth structure mentioned above can also be of the following structure (sixth structure), namely,

[0086] It also includes a power distribution unit 3, which is included in the circuit 10, is located in front of the battery unit 1, is connected to the other end of the cable 11, and outputs power from the battery unit 1.

[0087] In addition, the working machine 100 of any of the above-mentioned fourth to sixth structures can also be the following structure (seventh structure), that is,

[0088] The aforementioned cable 11 is routed through the lower side of the aforementioned battery unit 1.

[0089] Industrial applicability

[0090] This invention can be applied to construction machinery, agricultural machinery, and other operating machinery.

Claims

1. A type of operating machinery, characterized in that, have: A battery cell that transmits and receives power between itself and electrical equipment; The relay unit relays the transmission and reception of the power. as well as The safety device detects whether the circuit between the battery unit and the relay unit is disconnected, and if the circuit is disconnected, stops the transmission and reception of power. At least a portion of the safety device is positioned above the battery cell.

2. The operating machinery according to claim 1, characterized in that, The safety device can be detachably installed on the relay unit. When the safety device is disconnected from the relay unit, the transmission and reception of power are stopped.

3. The operating machinery according to claim 1, characterized in that, The relay unit is positioned above the battery unit.

4. The operating machinery according to claim 1, characterized in that, The circuit includes a cable with the safety device configured at one end.

5. The operating machinery according to claim 4, characterized in that, It also features a removable engine cover that covers the battery cell and the safety device. One end of the cable is routed to the engine cover side of the battery cell. The engine cover is positioned at a distance from the safety device, behind the battery cell.

6. The operating machinery according to claim 4, characterized in that, It also includes a power distribution unit, which is contained in the circuit, positioned forward of the battery unit, and connected to the other end of the cable to output power from the battery unit.

7. The operating machinery according to claim 4, characterized in that, The cable is routed through the lower side of the battery cell.

8. The operating machinery according to claim 1, characterized in that, The battery unit is composed of multiple battery modules.

9. The operating machinery according to claim 1, characterized in that, The safety device is located in the engine compartment housing the battery unit, positioned above and behind the battery unit.

10. The operating machinery according to claim 1, characterized in that, The safety device prevents the electric motor from driving when the circuit is cut off.

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