Battery connection structure and electric work machine equipped with said battery connection structure

Abstract

To suppress deterioration of a connector provided in a battery when attachment / detachment of the battery is repeated.SOLUTION: A battery connection structure includes a first transmission part having a second connector removably connected to a first connector of a battery attachably / detachably provided on an electric work machine, a second transmission part which is provided on the electric work machine and is electrically connected to an electric device supplied with power from the battery, and a connection device for electrically connecting the first transmission part and the second transmission part. The first transmission part has a first terminal which has a first opening and is electrically connected to the second connector, and the connection device has a second terminal that includes a first shaft member inserted into the first opening and is electrically connected to the second transmission part, and a first fixture which is mounted on the first shaft member, fixes the first terminal and the second terminal, and releases fixation of the first terminal and the second terminal by being removed from the first shaft member.SELECTED DRAWING: Figure 3B

Description

[Technical Field]

[0001] The present invention relates to a battery connection structure and an electric working machine equipped with the battery connection structure. [Background technology]

[0002] BACKGROUND ART Conventionally, an electric tractor disclosed in Patent Document 1 and an electric backhoe disclosed in Patent Document 2 are known. The electric tractor disclosed in Patent Document 1 includes an electric motor that drives a traveling device, a battery, and an inverter that supplies power from the battery to the electric motor. In addition, the electric backhoe disclosed in Patent Document 2 is equipped with a hydraulic pump, an electric motor that drives the hydraulic pump, and a battery that supplies power to the electric motor, and the battery includes a main secondary battery and an auxiliary secondary battery that can be attached and detached to the swivel frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-60665 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-237943 Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of a work machine that is driven by power from a battery, such as the electric tractor disclosed in Patent Document 1, when performing work that places a heavy load on the machine, the power stored in the battery is consumed to a large extent, and the battery may need to be charged in the middle of the work. For this reason, to reduce charging time, there are work machines that allow the battery (auxiliary secondary battery) to be attached or detached, such as the electric backhoe disclosed in Patent Document 2.

[0005] However, if the battery is detachable, when installing or removing the battery, it is necessary to plug and unplug the battery connector and a connector such as a harness that extracts power from the battery, and plugging and unplugging the connector every time the battery is installed or removed can cause the connector to deteriorate. The present invention has been made to solve the problems of the conventional technology, and aims to provide a battery connection structure that can prevent deterioration of the connector provided on the battery when the battery is repeatedly attached and detached, and an electric work machine equipped with the battery connection structure. [Means for solving the problem]

[0006] A battery connection structure according to one aspect of the present invention includes a first transmission part having a second connector detachably connected to a first connector of a battery detachably provided on an electric operating machine, a second transmission part electrically connected to an electric device provided on the electric operating machine and supplied with power from the battery, and a connection device electrically connecting the first transmission part and the second transmission part, wherein the first transmission part has a first opening formed therein. a first terminal, The connecting device has a first terminal electrically connected to the second connector, and the connecting device includes a first shaft member inserted into the first opening. a second terminal including: The connector includes a second terminal electrically connected to the second transmission part, and a first fixing device attached to the first shaft member to fix the first terminal and the second terminal together, and which is removed from the first shaft member to release the fixation between the first terminal and the second terminal.

[0007] The first transmission portion may have a plurality of the first terminals and a support portion that supports the plurality of first terminals at a distance from each other in a direction perpendicular to the opening direction of the first opening, and the connection device may have a plurality of the second terminals that respectively correspond to the plurality of first terminals. Among the plurality of first terminals, the inner diameter of the first opening of the first terminal of the positive electrode and the inner diameter of the first opening of the first terminal of the negative electrode are different in size, the outer diameter of the first shaft member corresponds to the size of the inner diameter of the first opening, and the outer diameter of the first shaft member inserted into the first opening of the first terminal of the positive electrode and the inner diameter of the first shaft member inserted into the first opening of the first terminal of the negative electrode are different in size. The outer diameter of the first shaft member may be different from the outer diameter of the second shaft member.

[0008] The first shaft member may be a stud bolt, and the first fastener may be a nut fastened to the first shaft member. The first terminal may be a round terminal. The second transmission unit has a fourth connector that is detachably connected to the third connector of the electrical device, and a second opening. a third terminal, a third terminal electrically connected to the fourth connector, and the connection device includes a second shaft member inserted into the second opening. a fourth terminal including The connector may have a fourth terminal electrically connected to the second terminal, and a second fixing device attached to the second axial member to fix the third terminal and the fourth terminal together, and which, when removed from the second axial member, releases the fixation between the third terminal and the fourth terminal.

[0009] The second shaft member may be a stud bolt, and the second fastener may be a nut fastened to the second shaft member. The second transmission unit has a fourth connector that is detachably connected to the third connector of the electrical device, and a second opening. a third terminal, The fourth connector may have a third terminal electrically connected to the fourth connector, the first shaft member being inserted through the first opening and the second opening, and the first fixing device fixedly connecting the first terminal, the second terminal, and the third terminal.

[0010] The second terminal may be a round terminal. The electric work machine comprises a battery connection structure, the electric equipment, a vehicle body on which the electric equipment is mounted, an attachment portion for detachably attaching the battery to the vehicle body, and an electric motor mounted on the vehicle body and driven by power supplied from the battery. The connection device may be provided with a temperature detection unit that detects the temperature at or near the second terminal, and an alarm device that alerts an operator if the temperature detected by the temperature detection unit exceeds a predetermined threshold.

[0011] The electric work machine includes a control device that controls the electric motor and a temperature detection unit that is provided in the connection device and detects the temperature at or near the second terminal, and the electrical equipment includes an inverter that controls the power supplied from the battery to the electric motor, and the control device may control the inverter to reduce the power supplied to the electric motor when the temperature detected by the temperature detection unit exceeds a predetermined threshold.

[0012] The electric working machine includes a traveling device provided on the vehicle body and driven by power generated by the electric motor, a working device provided on the vehicle body and driven by power generated by the electric motor, a control device that controls the traveling device and the working device, and a temperature detection unit provided on the connection device and that detects the temperature at or near the second terminal, and the control device may allow the traveling device to be driven and restrict the driving of the working device when the temperature detected by the temperature detection unit exceeds a predetermined threshold.

[0013] The second transmission unit may have a fourth connector that is detachably connected to a third connector of the electrical equipment, and the electrical equipment may include either an inverter that drives the electric motor using power supplied from the battery, or a DC / DC converter that converts the voltage of the power supplied from the battery. [Effects of the Invention]

[0014] According to the present invention, deterioration of the connector provided on the battery can be suppressed when the battery is repeatedly attached and detached. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a side view of an electric work machine (tractor). [Figure 2] 1 is a diagram showing the entire system of an electric working machine. [Figure 3A] 1A and 1B are diagrams illustrating an outline of a battery, an electric device, and a battery connection structure according to a first embodiment. [Figure 3B] 1 is a perspective view of a battery connection structure according to a first embodiment. [Figure 3C] 4 is a perspective view illustrating attachment of a first transmission part to the connection device of the first embodiment. FIG. [Figure 4A] FIG. 2 is a plan view showing the connection device and the first transmission unit of the first embodiment. [Figure 4B] FIG. 2 is a plan view showing the connection device and the second transmission unit of the first embodiment. [Figure 5] FIG. 10 is a diagram illustrating an outline of a battery, an electrical device, and a battery connection structure according to a second embodiment. [Figure 6] 10A and 10B are diagrams illustrating an outline of a battery, an electric device, and a battery connection structure according to a third embodiment. [Figure 7A] 10A and 10B are diagrams illustrating an outline of a battery, an electric device, and a battery connection structure according to a fourth embodiment. [Figure 7B] FIG. 10 is a perspective view of a battery connection structure according to a fourth embodiment. [Figure 7C] FIG. 10 is a perspective view illustrating attachment of a first transmission unit and a second transmission unit to a connection device according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a side view showing one embodiment of an electric work machine 1. In this embodiment, the electric work machine 1 is a tractor driven by power supplied from a battery 40a. Note that the electric work machine 1 is not limited to a tractor, and may be an agricultural machine (agricultural vehicle) such as a combine harvester or transplanter, or a construction machine (construction vehicle) such as a backhoe or loader work machine.

[0017] As shown in Fig. 1, the electric work machine 1 includes a vehicle body 2. The vehicle body 2 is provided with a driver's seat 7 in which an operator sits. In the following description of this embodiment, the direction that an operator seated in the driver's seat 7 of the electric work machine 1 faces (the direction of arrow A1 in Fig. 1) is referred to as the front, the opposite direction (the direction of arrow A2 in Fig. 1) as the rear, the left side of the operator (the front side in Fig. 1) as the left side, and the right side of the operator (the back side in Fig. 1) as the right side.

[0018] Fig. 2 is a diagram showing the entire system of the electric work machine 1. As shown in Figs. 1 and 2, the electric work machine 1 includes a battery unit 40, an electric motor 45, electric equipment 50, a traveling device 4, a transmission 5, and a working device 6. The battery unit 40, the electric motor 45, the electric equipment 50, the traveling device 4, the transmission 5, and the working device 6 are provided on the vehicle body 2.

[0019] The battery unit 40 is a structure that can store electricity and output the stored electricity. The battery unit 40 has a battery 40a inside a housing (casing) 40b. The battery 40a can store electricity and is a secondary battery such as a lithium ion battery or a lead storage battery. The battery 40a has a plurality of cells inside, and the plurality of cells are electrically connected in series and parallel.

[0020] The battery 40a has a BMU (battery management unit) 40a1. The BMU 40a1 is a battery monitoring device that monitors and controls the battery 40a. Therefore, the BMU 40a1 can acquire, for example, the voltage, temperature, current, and terminal voltage of the internal cells of the battery 40a, monitor the battery 40a, and control the charging and discharging of the battery 40a.

[0021] The electric work machine 1 also has an attachment part for detachably attaching the battery 40a to the vehicle body 2, and in this embodiment, the housing 40b of the battery unit 40 provided on the vehicle body 2 also serves as the attachment part. The battery 40a is detachably attached to the attachment part (housing) 40b by fastening members such as bolts or fixing members (not shown) that restrict the relative movement of the battery 40a with respect to the housing.

[0022] In the example shown in FIG. 2, the battery unit 40 includes a single battery 40a, but the battery unit 40 may include a plurality of batteries 40a connected in parallel or in series. The electric motor 45 is driven by power supplied from the battery 40a (battery unit 40). The electric motor 45 is the drive source of the electric work machine 1. The electric motor 45 rotates a drive shaft (not shown) by power supplied from the battery 40a. The electric motor 45 is a three-phase AC synchronous motor with embedded permanent magnets. The electric motor 45 has a rotatable rotor and a stator that generates a force to rotate the rotor.

[0023] The electric device 50 is an electric component or other device connected to the battery 40a (battery unit 40). Specifically, the electric device 50 is connected directly or indirectly to the battery 40a and transmits power supplied by the battery 40a to other devices, or is operated by the power. The electric device 50 includes, for example, an inverter 51 and a DC / DC converter 52.

[0024] The inverter 51 is connected to the battery 40a and the electric motor 45. The inverter 51 is a device that drives the electric motor 45, and converts DC power supplied by the battery 40a into three-phase AC power and supplies it to the electric motor 45. In other words, the electric motor 45 is connected to the battery 40a via the inverter 51. The inverter 51 can arbitrarily change the current and voltage of the power supplied to the electric motor 45.

[0025] The DC / DC converter 52 is connected to the battery 40a and converts the voltage of the DC power supplied from the battery 40a into a different voltage. In this embodiment, the DC / DC converter 52 is a step-down converter that converts an input voltage into a lower voltage. The DC / DC converter 52 supplies power to, for example, an on-board battery 55 that supplies power to electronic devices provided in the electric work machine 1.

[0026] The electrical equipment 50 is not limited to the inverter 51 and the DC / DC converter 52, but may be any electrical equipment electrically connected to the battery 40a, and may include a charger 53 provided in the electric work machine 1. The charger 53 is a socket to which a cable for charging the battery 40a is connected. The battery 40a can be charged by power supplied from an external source via the charger 53. For convenience of explanation, the electrical equipment 50 will be described below using the inverter 51 and the DC / DC converter 52 as examples.

[0027] The traveling device 4 is a device that is driven by power generated by an electric motor 45. As shown in Fig. 1, the traveling device 4 is a device that has front wheels 4A and rear wheels 4B that are driven to rotate, and the vehicle body 2 can travel by the traveling device 4. The front wheels 4A and rear wheels 4B may be of a tire type or a crawler type. The transmission 5 is connected to the drive shaft of the electric motor 45. Therefore, the power output by the electric motor 45 is transmitted to the transmission 5, and the traveling device 4 is driven by the power whose speed has been changed by the transmission 5. The transmission 5 is provided with an output shaft (PTO shaft) 16 that outputs the power output by the electric motor 45 to the outside. The PTO shaft 16 is provided so as to protrude rearward from the rear of the vehicle body 2.

[0028] As shown in Figure 2, the transmission 5 includes a main shaft (propeller shaft) 5a, a main transmission unit 5b, an auxiliary transmission unit 5c, a shuttle unit 5d, and a PTO power transmission unit 5e. The propeller shaft 5a is rotatably supported in a housing case of the transmission 5, and power is transmitted to the propeller shaft 5a from the drive shaft of the electric motor 45. The main transmission unit 5b has multiple gears and a shifter that changes the connections of the gears. The main transmission unit 5b changes and outputs (changes the speed of) the rotation input from the propeller shaft 5a by appropriately changing the connections (meshing) of the multiple gears using the shifter.

[0029] Similar to the main transmission unit 5b, the sub-transmission unit 5c has a plurality of gears and a shifter for changing the connection of the gears. The sub-transmission unit 5c changes and outputs (shifts) the rotation input from the main transmission unit 5b by appropriately changing the connection (meshing) of the plurality of gears with the shifter. The shuttle unit 5d has a shuttle shaft 12 and a forward / reverse switching unit 13. Power output from the sub-transmission unit 5c is transmitted to the shuttle shaft 12 via gears or the like. The forward / reverse switching unit 13 is formed, for example, by a hydraulic clutch or the like, and switches the rotation direction of the shuttle shaft 12, i.e., the forward and reverse movement of the electric work machine 1, by engaging and disengaging the hydraulic clutch.

[0030] The PTO power transmission section 5e has a PTO propeller shaft 20 and a PTO clutch 21. The PTO propeller shaft 20 is rotatably supported and is capable of transmitting power from the propeller shaft 5a. The PTO propeller shaft 20 is connected to the PTO shaft 16 via gears or the like. The PTO clutch 21 has a first operation of transmitting the power of the propeller shaft 5a to the PTO propeller shaft 20, and a second operation of transmitting the power of the propeller shaft 5a to the PTO propeller shaft 20. and a second operation in which power is not transmitted to the PTO propulsion shaft 20. Specifically, the PTO clutch 21 is a hydraulic clutch and has a housing 21a that can rotate integrally with the PTO propulsion shaft 20, a clutch member 21b that can rotate integrally with the propulsion shaft 5a, and a piston 21c that can move within the housing 21a using hydraulic oil.

[0031] Therefore, when the piston 21c is moved to connect the clutch member 21b to the housing 21a, the PTO clutch 21 shifts to the first operation, and power from the electric motor 45 is transmitted to the PTO propulsion shaft 20 via the propulsion shaft 5a and the PTO clutch 21, and the power of the PTO propulsion shaft 20 is transmitted to the PTO shaft 16. In other words, the PTO shaft 16 is driven by the power of the electric motor 45 via the transmission 5. On the other hand, when the piston 21c is moved to separate the clutch member 21b from the housing 21a, the PTO clutch 21 shifts to the second operation, and the power of the propulsion shaft 5a is not transmitted to the PTO propulsion shaft 20, and the power of the propulsion shaft 5a is disconnected.

[0032] The transmission (connection) or disconnection of power by the PTO clutch 21 is performed by a PTO selector switch 32 or the like provided near the driver's seat 7. For example, when the PTO selector switch 32 is turned ON, the solenoid of the operating valve (electromagnetic valve) 17 connected to the piston 21c via an oil passage is excited, and the PTO clutch 21 is brought into an engaged state. When the PTO selector switch 32 is turned OFF, the solenoid of the operating valve 17 is de-energized, and the PTO clutch 21 is brought into a disengaged state.

[0033] The working device 6 is a device that is driven by power generated by the electric motor 45. In this embodiment, the working device 6 is operated by power input from the PTO shaft 16. The working device 6 is detachably attached to a coupling part 8 that is provided on the vehicle body 2 so that it can swing freely. The working devices 6 include a tilling device for tilling, a fertilizer spreading device for spreading fertilizer, a pesticide spreading device for spreading pesticide, a harvesting device for harvesting, a reaping device for reaping grass and the like, a spreading device for spreading grass and the like, a grass collecting device for collecting grass and the like, a forming device (roll baler) for shaping grass and the like, and the like.

[0034] In the above-described embodiment, the drive shaft of the electric motor 45 is connected to the transmission 5, the power output by the electric motor 45 is transmitted to the transmission 5, and the traveling device 4 and the working device 6 are driven by the power whose speed is changed by the transmission 5. However, the traveling device 4 and the working device 6 may be driven by the power generated by the electric motor 45, and the configuration is not limited to this.

[0035] For example, the electric work machine 1 may not have a transmission 5, but may have an electric motor 45 that outputs power to the traveling device 4 and the working device 6, and the traveling device 4 and the working device 6 may be configured to receive power directly from the drive shaft of the electric motor 45. The electric work machine 1 may also be provided with a hydraulic actuator that drives the traveling device 4 and the work device 6, and the hydraulic pump may be driven by the power of the electric motor 45, and the hydraulic actuator may be driven by the hydraulic oil output from the hydraulic pump.

[0036] As shown in Fig. 2, the electric work machine 1 includes a control device 30 and a storage device 31. The control device 30 is a device configured from electric and electronic circuits, programs stored in a CPU, etc., and controls the various devices of the electric work machine 1. The control device 30 controls the traveling device 4 and the working device 6. The control device 30 also controls the rotation speed of the electric motor 45 based on the operation of a rotation speed operating device (accelerator pedal) 33, which is an operable operating device provided around the driver's seat 7.

[0037] The storage device 31 is a non-volatile memory or the like, and stores various information related to the control of the control device 30. For example, the storage device 31 stores information such as a table related to the rotation speed of the electric motor 45 in relation to the operation amount of the rotation speed operation device 33. 2, the control device 30 has a first control unit 30a and a second control unit 30b. The first control unit 30a and the second control unit 30b are configured by electric and electronic components provided in the control device 30, and programs installed in the storage device 31, etc.

[0038] The first control unit 30a is, for example, a vehicle control device that controls the inverter 51. The first control unit 30a controls the inverter 51 based on, for example, the operation of the rotation speed control device 33 and a table stored in the storage device 31, and controls the inverter 51 to convert the electric power supplied from the battery 40a to the electric motor 45. Control the power consumption. The second control unit 30b is, for example, a vehicle control device that controls the operating valve 17. The second control unit 30b switches between excitation and de-energization of the solenoid of the operating valve 17 based on the operation of the PTO changeover switch 32, for example, to control the PTO clutch 21.

[0039] The control device 30 is connected to other devices such as the BMU 40a1, the storage device 31, and other ECUs (not shown) via an in-vehicle network N1 such as a CAN (Controller Area Network). As shown in Fig. 2, the electric work machine 1 includes a connection structure 60 for the battery 40a. The connection structure 60 for the battery 40a is a structure that connects the battery 40a (battery unit 40) and the electric device 50. Fig. 3A is a diagram illustrating an overview of the battery 40a, the electric device 50, and the connection structure 60 for the battery 40a according to the first embodiment. As shown in Figs. 2 and 3A, the connection structure 60 for the battery 40a includes a first transmission part 70, a second transmission part 80, and a connection device 90.

[0040] The first transmission unit 70 is a cable (high-voltage harness) that is electrically connected to the battery 40a and transmits power supplied from the battery 40a and transmits power to the battery 40a. The first transmission unit 70 has a first electric wire 71, a second connector 72, and a first terminal 73. The first electric wires 71 are electric wires that constitute the P and N lines, and the first transmission part 70 has a plurality of (a pair of) first electric wires 71.

[0041] The second connector 72 is a connecting member provided at one end of the pair of first electric wires 71, and includes a positive terminal (not shown) and a negative terminal (not shown). The positive terminal of the second connector 72 is electrically connected to the first electric wire 71 constituting the P line. The negative terminal of the second connector 72 is electrically connected to the first electric wire 71 constituting the N line. The second connector 72 is a connector (coupler) that is detachably connected to the first connector 41 provided on the battery 40a.

[0042] The first terminal 73 is a terminal electrically connected to the second connector 72. Specifically, the first terminal 73 is electrically connected to the second connector 72 via the first electric wire 71. The first terminal 73 is made of a conductor and is a terminal provided at the other end of the first electric wire 71. The first transmission unit 70 has a positive first terminal 73a and a negative first terminal 73b. For convenience of explanation, the positive first terminal 73a may be referred to as the "first P terminal" and the negative first terminal 73b may be referred to as the "first N terminal" below.

[0043] FIG. 3B is a perspective view of the connection structure 60 for the battery 40a of the first embodiment. FIG. 3C is a perspective view illustrating the attachment of the first transmission unit 70 to the connection device 90 of the first embodiment. FIG. 4A is a plan view showing the connection device 90 and the first transmission unit 70 of the first embodiment. As shown in FIGS. 3B, 3C, and 4A, the first terminal 73 is formed with a first connection unit 74 and a first opening 75. The first connection unit 74 constitutes the base end of the first terminal 73 and is a substantially cylindrical portion into which the core wire at the other end of the first electric wire 71 is inserted. The first connection unit 74 is connected to the other end of the first electric wire 71 by being crimped with a crimping tool. An insulating coating made of a non-conductor is attached to the first connection unit 74.

[0044] The first opening 75 is a through-hole that penetrates the tip of the first terminal 73 in a direction perpendicular to the plate surface of the first terminal 73. In this embodiment, the first opening 75 is a circular hole. The tip of the first terminal 73 has an outer edge that forms a circle concentric with the first opening 75. That is, in the examples shown in FIGS. 3B, 3C, and 4A, the first terminal 73 is a round terminal.

[0045] 4A, among the multiple first terminals 73, the inner diameter R1 of the first opening 75 of the first P terminal 73a and the inner diameter R2 of the first opening 75 of the first N terminal 73b are different in size (R1≠R2). Specifically, the inner diameter R1 of the first opening 75 of the first P terminal 73a is larger than the inner diameter R2 of the first opening 75 of the first N terminal 73b (R1>R2). Note that, as shown in FIG. 4A, the size of the outer edge of the first terminals 73 also differs depending on the size of the first opening 75.

[0046] The first transmission unit 70 also has a support unit (first support unit) 76. The first support unit 76 is a member that supports the multiple first terminals 73 at a distance from each other in a direction perpendicular to the opening direction of the first opening 75. The first support unit 76 is made of a non-conductor and has holes formed therein through which the first connection units 74 are inserted. This allows the first support unit 76 to maintain a distance between the multiple first terminals 73 that it supports. As shown in FIG. 4A , the first support unit 76 maintains a constant distance (first distance) L1 between the center of the first opening 75 of one first terminal 73 and the center of the first opening 75 of another first terminal 73 adjacent to that first terminal 73.

[0047] 3A shows a case where the electric work machine 1 is equipped with a single battery 40a, so the connection structure 60 for the battery 40a is equipped with a single first transmission unit 70, but if the battery unit 40 is provided with multiple batteries 40a, the connection structure 60 for the battery 40a only needs to be equipped with a number of first transmission units 70 corresponding to the number of batteries 40a. In other words, if there are two batteries 40a, there will be two first transmission units 70, and if there are three batteries 40a, there will be three first transmission units 70.

[0048] In addition, in this embodiment, the first transmission unit 70 has been described as having a pair of first electric wires 71, a pair of first terminals 73, and a single second connector 72, but the first electric wires 71, first terminals 73, and second connectors 72 of the first transmission unit 70 may each be single, and the number of first electric wires 71 and first terminals 73 may be three or four, and are not limited to one pair.

[0049] The second transmission unit 80 is a cable (high-voltage harness) that is electrically connected to the electric device 50 and transmits power to the electric device 50 and transmits power supplied from the electric device 50. As shown in FIG. 3A , the second transmission unit 80 has a second electric wire 81, a fourth connector 82, and a third terminal 83. The second electric wires 81 are electric wires that constitute the P and N lines, and the second transmission part 80 has a plurality of second electric wires 81 (a pair of second electric wires 81).

[0050] The fourth connector 82 is a connecting member provided at one end of the pair of second electric wires 81, and includes a positive terminal and a negative terminal. The positive terminal of the fourth connector 82 is electrically connected to the second electric wire 81 constituting the P line. The negative terminal of the fourth connector 82 is electrically connected to the second electric wire 81 constituting the N line. The fourth connector 82 is a connector (coupler) that is detachably connected to the third connector 54 of the electric device 50.

[0051] The third terminal 83 is a terminal electrically connected to the fourth connector 82. Specifically, the third terminal 83 is electrically connected to the fourth connector 82 via the second electric wire 81. The third terminal 83 is made of a conductor and is a terminal provided at the other end of the second electric wire 81. The second transmission unit 80 has a positive third terminal 83a and a negative third terminal 83b. For convenience of explanation, the positive third terminal 83a may be referred to as the "third P terminal" and the negative third terminal 83b may be referred to as the "third N terminal" below.

[0052] 4B is a plan view showing the connection device 90 and the second transmission section 80 of the first embodiment. As shown in FIGS. 3B and 4B, the third terminal 83 is formed with a second connection section 84 and a second opening 85. The second connection section 84 constitutes the base end of the third terminal 83 and is a substantially cylindrical section into which the core wire at the other end of the second electric wire 81 is inserted. The second connection section 84 is connected to the other end of the second electric wire 81 by being crimped with a crimping tool. An insulating coating made of a non-conductor is attached to the second connection section 84.

[0053] The second opening 85 is a through-hole that penetrates the tip of the third terminal 83 in a direction perpendicular to the plate surface of the third terminal 83. In this embodiment, the second opening 85 is a circular hole. The tip of the third terminal 83 has an outer edge that forms a circle concentric with the second opening 85. That is, in the example shown in FIGS. 3B and 4B , the third terminal 83 is a round terminal. Similarly to the first opening 75, the inner diameter R3 of the second opening 85 of the second P terminal 92a and the inner diameter R4 of the second opening 85 of the second N terminal 92b among the plurality (pair) of third terminals 83 may be different in size (R3≠R4). As shown in FIG. 4B, the inner diameter R3 of the second opening 85 of the second P terminal 92a is larger than the inner diameter R4 of the second opening 85 of the second N terminal 92b (R3>R4). As shown in FIG. 4B, the size of the outer edge of the third terminal 83 also differs depending on the size of the second opening 85.

[0054] The second transmission section 80 also has a second support section 86. The second support section 86 is a member that supports a plurality of (pairs of) third terminals 83 at a distance from each other in a direction perpendicular to the opening direction of the second opening section 85. The second support section 86 is made of a non-conductor, and has a hole formed therein through which the second connection section 84 is inserted. This allows the second support section 86 to maintain the distance between the plurality of third terminals 83 that it supports.

[0055] 4B , the second support portion 86 maintains the third terminal 83 so that the second distance L2 between the center of the second opening 85 of the third terminal 83 and the center of the second opening 85 of the third terminal 83 adjacent to the third terminal 83 in question is equal to the first distance L1 (L2 = L1). Note that in the example described above, the second support portion 86 maintains the second distance L2 so that the second distance L2 is equal to the first distance L1, but the second distance L2 is not limited to being equal to the first distance L1 and may be longer or shorter than the first distance L1.

[0056] In addition, the connection structure 60 of the battery 40a includes a second transmission part 80 corresponding to each electrical device 50, and in the example shown in Figure 3A, includes a second transmission part 80 connected to the third connector 54 of the inverter 51 and a second transmission part 80 connected to the third connector 54 of the DC / DC converter 52. In addition, in this embodiment, the second transmission unit 80 has been described as having a pair of second electric wires 81, a pair of third terminals 83, and a single fourth connector 82, but the second electric wires 81, the third terminals 83, and the fourth connector 82 of the second transmission unit 80 may each be single, and the number of second electric wires 81 and the number of third terminals 83 may be three or four, and are not limited to one pair.

[0057] The connection device 90 is a device (terminal block) that electrically connects the first transmission unit 70 and the second transmission unit 80. As shown in Figures 3A, 3B, and 3C, the connection device 90 has a base unit 91, a second terminal 92, a fourth terminal 95, and a conductive member 98. The base unit 91 is an installation base that is attached to the vehicle body 2 of the electric operating machine 1 with bolts, brackets, or the like. The base unit 91 is formed of a non-conductor such as resin.

[0058] The second terminal 92, the fourth terminal 95, and the conductive member 98 are formed from conductors and form a path electrically connecting the first transmission unit 70 and the second transmission unit 80. The connection device 90 has a positive second terminal 92a, a fourth terminal 95a, and a conductive member 98, and a negative second terminal 92b, a fourth terminal 95b, and a conductive member 98. For convenience of explanation, the positive second terminal 92a may be referred to as the "second P terminal" and the negative second terminal 92b may be referred to as the "second N terminal." Furthermore, the positive fourth terminal 95a may be referred to as the "fourth P terminal" and the negative fourth terminal 95b may be referred to as the "fourth N terminal." The second terminal 92, the fourth terminal 95, and the conductive member 98 are provided on the base portion 91.

[0059] The second terminals 92 are terminals to which the first terminals 73 of the first transmission unit 70 are attached and which form contact points with the first terminals 73. The second terminals 92 correspond to the first terminals 73, and in this embodiment, the same number of second terminals 92 as the number of first terminals 73 are provided on the base unit 91. That is, in the example shown in FIG. 3A etc., there is one first transmission unit 70 and two first terminals 73, and therefore two second terminals 92 are provided on the base unit 91.

[0060] Furthermore, the fourth terminals 95 are terminals to which the third terminals 83 of the second transmission unit 80 are attached and which form contact points with the second terminals 92. The fourth terminals 95 correspond to the third terminals 83, and in this embodiment, the same number of fourth terminals 95 as the third terminals 83 are provided on the base unit 91. That is, in the example shown in FIG. 3A etc., there are two second transmission units 80 and four third terminals 83, and therefore four fourth terminals 95 are provided on the base unit 91.

[0061] The conductive member 98 is a path that electrically connects the second terminal 92 and the fourth terminal 95. Therefore, in a state in which the third terminal 83 is attached to the fourth terminal 95, the second terminal 92 is electrically connected to the second transmission unit 80 via the fourth terminal 95. The conductive member 98 is, for example, a bus bar provided inside the base unit 91. As shown in FIGS. 3C and 4A, the second terminal 92 includes a first shaft member 93 and a first installation portion 94. , and the first shaft member 93 is a shaft-shaped member inserted into the first opening 75. The first shaft member 93 protrudes from the base portion 91. The first shaft member 93 is formed from a conductor, and in this embodiment, is a stud bolt. Note that the first shaft member 93 is not limited to a stud bolt and may be formed from a non-conductor as long as it can be inserted into the first opening 75. In the following description, among the multiple first shaft members 93, the positive electrode first shaft member 93a, i.e., the first shaft member 93a inserted into the first opening 75 of the first P terminal 73a, may be referred to as the "first P shaft," and the negative electrode first shaft member 93b, i.e., the first shaft member 93b inserted into the first opening 75 of the first N terminal 73b, may be referred to as the "first N shaft."

[0062] The multiple second terminals 92 are arranged on the base portion 91 to correspond to the respective first transmission units 70. Specifically, as shown in Fig. 4A, the second P terminal 92a and the second N terminal 92b are provided on the same surface of the base portion 91 for each corresponding first transmission unit 70 such that the distance L3 between the axial centers of the first shaft members 93 matches the first distance L1 of the first terminals 73 (L3 = L1). The multiple second terminals 92 are arranged in a straight line at one end of the base portion 91 and spaced apart from each other.

[0063] As shown in FIG. 4A, the outer diameters R5 and R6 of the first shaft member 93 correspond to the inner diameters R1 and R2 of the first opening 75. That is, the outer diameter R5 of the first P shaft 93a and the outer diameter R6 of the first N shaft 93b are different in size (R5≠R6). In this embodiment, the outer diameter R5 of the first P shaft 93a is larger than the outer diameter R6 of the first N shaft 93b (R5>R6). More specifically, the outer diameter R5 of the first P shaft 93a may be larger than the inner diameter R2 of the first opening 75 of the first N terminal 73b (R5>R2). This allows for both a strong connection between the first P terminal 73a and the second P terminal 92a and a reduction in installation space for the connection device 90 by forming the first N terminal 73b and the second N terminal 92b small.

[0064] In the above-described embodiment, the outer diameter R5 of the first P shaft 93a is larger than the outer diameter R6 of the first N shaft 93b (R5>R6) and is larger than the inner diameter R2 of the first opening 75 of the first N terminal 73b (R5>R2). However, the outer diameter R5 of the first P shaft 93a and the outer diameter R6 of the first N shaft 93b may be different in size (R5≠R6), and the outer diameter R6 of the first N shaft 93b may be larger than the outer diameter R6 of the first P shaft 93a (R6>R5). In such a case, the outer diameter R6 of the first N shaft 93b may be larger than the inner diameter R1 of the first opening 75 of the first P terminal 73a (R6>R1). As a result, although the first P terminal 73a is normally connected to the second terminal 92 before the first N terminal 73b, since the first N shaft 93b cannot be inserted through the first opening 75 of the first P terminal 73a, it is possible to more reliably prevent an operator from connecting the first terminal 73 to the second terminal 92 with the wrong polarity between positive and negative.

[0065] The first installation portion 94 is made of a conductor and is a portion that forms a contact point with the first terminal 73. The first installation portion 94 is the base end of the first shaft member 93 and is provided on the base portion 91. In this embodiment, the first installation portion 94 is an annular metal piece that surrounds the base end of the first shaft member 93. 3B, 3C, and 4B, the fourth terminal 95 includes a second shaft member 96 and a second installation portion 97. The second shaft member 96 is a shaft-shaped member inserted into the second opening 85. The second shaft member 96 protrudes from the base portion 91. The second shaft member 96 is formed of a conductor, and in this embodiment, is a stud bolt. Note that the second shaft member 96 is not limited to a stud bolt and may be formed of a non-conductor as long as it can be inserted into the second opening 85. In the following description, of the multiple second shaft members 96, the positive electrode second shaft member 96a, i.e., the second shaft member 96a inserted into the second opening 85 of the second P terminal 92a, will be referred to as the "second P shaft," and the negative electrode second shaft member 96b, i.e., the second shaft member 96b inserted into the second opening 85 of the second N terminal 92b, will be referred to as the "second N shaft."

[0066] 3B, 3C, and 4B, the plurality of third terminals 83 are arranged on the base portion 91 to correspond to the respective second transmission units 80. Specifically, the second P terminal 92a and the second N terminal 92b are provided on the same surface of the base portion 91 for each corresponding second transmission unit 80 such that the distance L4 between the axial centers of the second shaft members 96 coincides with the second distance L2 of the third terminals 83 (L4 = L2). The plurality of fourth terminals 95 are arranged in a straight line at the other end of the base portion 91, spaced apart from one another. That is, on the base portion 91, a straight line formed by the plurality of second terminals 92 and a straight line formed by the plurality of fourth terminals 95 are formed in parallel.

[0067] The multiple fourth terminals 95 may be arranged at one end of the base portion 91, spaced apart from the second terminals 92. In such a case, the multiple second terminals 92 and the multiple fourth terminals 95 form a linear row on the base portion 91. The outer diameters R7 and R8 of the second shaft member 96 correspond to the inner diameters R3 and R4 of the second opening 85. That is, the outer diameter R7 of the second P shaft 96a and the outer diameter R8 of the second N shaft 96b are different in size (R7≠R8). In this embodiment, the outer diameter R7 of the second P shaft 96a is larger than the outer diameter R8 of the second P shaft 96a (R7>R8). More specifically, the outer diameter R7 of the second P shaft 96a may be larger than the inner diameter R4 of the second opening 85 of the third N terminal 83b (R7>R4). This prevents an operator from inserting the third P shaft into the second opening 85 of the third N terminal 83b, thereby preventing an operator from attaching the third terminal 83 to the fourth terminal 95 with the positive and negative poles mistaken. This makes it possible to firmly connect the third P terminal 83a and the fourth P terminal 95a, while also reducing the installation space of the connection device 90 by making the third N terminal 83b and the fourth N terminal 95b small.

[0068] In the above-described embodiment, the outer diameter R7 of the second P shaft 96a is larger than the outer diameter R8 of the second N shaft 96b (R7>R8) and is larger than the inner diameter R4 of the second opening 85 of the third N terminal 83b (R7>R4). However, as long as the outer diameter R7 of the second P shaft 96a and the outer diameter R8 of the second N shaft 96b are different in size (R7≠R8), the outer diameter R8 of the second N shaft 96b may be larger than the outer diameter R7 of the second P shaft 96a (R8>R7). In such a case, the outer diameter R8 of the second N shaft 96b may be larger than the inner diameter R3 of the second opening 85 of the second P terminal 92a (R8>R3). As a result, although the third P terminal 83a is normally connected to the fourth terminal 95 before the third N terminal 83b, since the third N shaft cannot be inserted through the second opening 85 of the third P terminal 83a, it is possible to more reliably prevent an operator from connecting the third terminal 83 to the fourth terminal 95 with the wrong polarity between positive and negative.

[0069] The second installation portion 97 is made of a conductor and forms a contact point with the third terminal 83. The second installation portion 97 is the base end of the second shaft member 96 and is provided on the base portion 91. In this embodiment, the second installation portion 97 is an annular metal piece that surrounds the base end of the second shaft member 96. Next, the attachment of the first terminal 73 to the second terminal 92 and the attachment of the third terminal 83 to the fourth terminal 95 will be described. As shown in FIGS. 3B and 3C , the first transmission unit 70 has a first fixture 77. The first fixture 77 is a member that fixes the first terminal 73 and the second terminal 92 together and, when removed from the first shaft member 93, releases the fixation between the first terminal 73 and the second terminal 92. The first fixture 77 is a fastener (nut 77a) that is fastened to the first shaft member 93. Therefore, as shown in FIG. 3C , an operator can insert the first shaft member 93 into the first opening 75 of the first terminal 73, attach the nut 77a to the first shaft member 93, and tighten the nut 77a with a predetermined torque to reliably and securely connect (fix and connect) the first terminal 73 and the second terminal 92. Furthermore, by removing the nut 77a from the first shaft member 93, the worker can easily release the first terminal 73 and the second terminal 92 from being fixed together.

[0070] As a result, even when the battery 40a of the electric work machine 1 is attached or detached, the connection of the battery 40a can be released by removing the first fixing device 77. Therefore, there is no need to insert or remove the first connector 41 of the battery 40a from the second connector 72, which prevents the first connector 41 from being damaged. 3B, the second transmission part 80 has a second fixing member 87. The second fixing member 87 is a member that fixes the second terminals 92 together and releases the fixation between the second terminals 92 when it is removed from the second shaft member 96. The second fixing device 87 is a fastener (nut 87a) that is fastened to the second shaft member 96. Therefore, the worker can reliably and securely connect the second terminals 92 together by inserting the second shaft member 96 into the second opening 85 of the second terminal 92, attaching the nut 87a to the second shaft member 96, and tightening it with a predetermined torque. In addition, the worker can easily release the fixation between the second terminals 92 and the second terminal 92 by removing the nut 87a from the second shaft member 96.

[0071] As a result, even when the electric device 50 of the electric operating machine 1 is attached or detached, the connection of the electric device 50 can be released by removing the second fastener 87. Therefore, there is no need to insert or remove the third connector 54 of the electric device 50 from the fourth connector 82, which prevents the third connector 54 from being damaged. Note that, with the first P terminal 73a and the second P terminal 92a attached by the first fixture 77, a cover (not shown) may be attached to cover the first P terminal 73a, the second P terminal 92a, and the first fixture 77. Furthermore, with the third P terminal 83a and the fourth P terminal 95a attached by the second fixture 87, a cover may be attached to cover the third P terminal 83a, the fourth P terminal 95a, and the second fixture 87. The cover may cover the first terminal 73, the second terminal 92, and the first fixture 77 for each first transmission unit 70, or may cover the third terminal 83, the fourth terminal 95, and the second fixture 87 for each second transmission unit 80, or may cover all of the first to fourth terminals 95, the first fixture 77, and the second fixture 87.

[0072] As shown in FIG. 2, the electric operating machine 1 is also provided with a temperature detection unit 34 and a notification device 35. The temperature detection unit 34 is one or more sensors that detect the temperature of the second terminal 92 or in the vicinity of the second terminal 92. The temperature detection unit 34 is, for example, a thermistor or a thermocouple provided at the second terminal 92 or in the vicinity of the second terminal 92. The temperature detection unit 34 is insulated and provided directly at the second terminal 92. The temperature detection unit 34 may be attached inside a cover that covers the first terminal 73 and the second terminal 92. The temperature detection unit 34 is connected to the control device 30 and outputs the detected temperature as a signal (detection signal) to the control device 30. When the detection signal is input from the temperature detection unit 34, the control device 30 calculates the temperature of the second terminal 92 or in the vicinity of the second terminal 92 based on the detection signal and an arithmetic expression stored in the storage device 31.

[0073] The notification device 35 is, for example, a display device connected to the control device 30 and provided near the driver's seat 7. The display device has a display screen that displays various information related to the work machine, and is controlled by the control device 30. The control device 30 includes a determination unit 30c and a third control unit 30d. The determination unit 30c and the third control unit 30d are configured by electrical and electronic components provided in the control device 30 and programs installed in the storage device 31. The determination unit 30c determines whether the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold. The threshold is a value defined through experiments and simulations. If the temperature detected by the temperature detection unit 34 exceeds the predetermined threshold, the determination unit 30c determines that an abnormality has occurred, such as an insufficient fixed connection between the first terminal 73 and the second terminal 92, i.e., the fastening torque of the first fastener 77 is low, the first terminal 73 and the second terminal 92 are deteriorated, or dirt is attached to the contact surface between the first terminal 73 and the second terminal 92. The threshold is stored in the storage device 31, and the definition of the value, etc., may be changed by operating an operation switch or an operation screen provided on the display device.

[0074] The third control unit 30d controls the notification device 35 in accordance with the determination result of the determination unit 30c. Specifically, when the determination unit 30c determines that the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold, the third control unit 30d outputs a control signal to the notification device 35, causing the notification device 35 to notify an operator. For example, the third control unit 30d causes a notification screen (not shown) to be displayed on a display device to notify the operator of an abnormality. Specifically, the notification screen displays a message (notification message) to the operator to check the fixed connection between the first terminal 73 and the second terminal 92 and to perform maintenance on the first terminal 73 and the second terminal 92.

[0075] In the above embodiment, the notification device 35 is a display device. However, the notification device 35 is not limited to a display device, and may be a speaker that notifies by voice or warning sound. The notification device 35 may be a speaker, and if the determination unit 30c determines that the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold, the third control unit 30d causes the speaker to output a notification message.

[0076] Furthermore, when the notification device 35 is a lamp and the determination unit 30c determines that the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold, the third control unit 30d causes the lamp to blink. In such a case, it is preferable to place a notation near the lamp indicating that there is an abnormality in the first terminal 73 and the second terminal 92. As a result, if the connection between the first terminal 73 and the second terminal 92 is insufficient or if the first terminal 73 or the second terminal 92 is deteriorated, the temperature of the second terminal 92 or the vicinity of the second terminal 92 detected by the temperature detection unit 34 will rise, and an abnormality can be reported based on the temperature information.

[0077] In the above-described embodiment, an example was described in which the temperature detection unit 34 detects the temperature at or near the second terminal 92. However, the temperature detection unit 34 may detect the temperature at or near the fourth terminal 95 instead of or in addition to the second terminal 92, and the alarm device 35 may issue an alarm based on the detected temperature. In addition, in the above-described embodiment, an example was given in which the electric work machine 1 is equipped with an alarm device 35, and when the temperature detected by the temperature detection unit 34 exceeds a threshold value, the alarm device 35 alerts the worker, but the control device 30 may control the inverter 51 instead of or in addition to the alarm device 35.

[0078] Specifically, when the determination unit 30c determines that the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold, the first control unit 30a corrects the operation amount of the rotation speed control device 33 and the power (calculated power) calculated from the table stored in the storage device 31, and controls the inverter 51. For example, when the determination unit 30c determines that the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold, the first control unit 30a controls the inverter 51 so that the temperature does not exceed a predetermined upper limit and power is not supplied from the battery 40a to the electric motor 45.

[0079] As a result, when the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold, the first control unit 30a corrects the calculation power to limit the power supplied from the battery 40a to the electric motor 45. Therefore, when the connection between the first terminal 73 and the second terminal 92 is insufficient or when the first terminal 73 or the second terminal 92 is deteriorated, the power supplied from the battery 40a to the electric motor 45 is reduced, thereby suppressing heat generation from the second terminal 92.

[0080] The upper limit may be proportional to the temperature, or may be changeable by operating a display device or the like. Furthermore, the first control unit 30a may correct the calculation power when the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold, and may correct the calculation power based on a predetermined calculation formula stored in the memory device 31 so that the corrected correction power is smaller than the calculation power.

[0081] In addition, if the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold, the third control unit 30d may control the notification device (display device) 35 to display, in addition to the notification message, a message (warning message) indicating that the power supplied from the battery 40a to the electric motor 45 is being restricted. Furthermore, when the temperature detected by the temperature detection unit 34 exceeds a threshold value, the control device 30 may control the traveling device 4 and the working device 6 instead of or in addition to the inverter 51. Specifically, when the determination unit 30c determines that the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold value, the control device 30 permits the traveling device 4 to be driven and restricts the driving of the working device 6.

[0082] More specifically, when the judgment unit 30c judges that the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold, the solenoid of the operating valve 17 is deenergized and the PTO clutch 21 is switched to a disconnected state, regardless of the operation of the PTO changeover switch 32. As a result, the power from the electric motor 45 is transmitted to the PTO propeller shaft 20 via the propeller shaft 5a and the PTO clutch 21. Since the first terminal 73 and the second terminal 92 are not connected properly, the control device 30 can permit the driving of the traveling device 4 and restrict the driving of the working device 6. Therefore, if the connection between the first terminal 73 and the second terminal 92 is insufficient or if the first terminal 73 or the second terminal 92 is deteriorated, the driving of the working device 6 is stopped to reduce the power consumption of the electric motor 45 and the power supplied from the battery 40a to the electric motor 45, thereby suppressing heat generation in the second terminal 92. Furthermore, because the electric working machine 1 can be driven, the worker can move to a barn or the like to perform maintenance on the first terminal 73 and the second terminal 92.

[0083] Furthermore, when the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold, the third control unit 30d may display, in addition to the notification message, a message (restriction message) indicating that the operation of the working device 6 is restricted. In the above-described embodiment, an example has been described in which the second control unit 30b controls the PTO clutch 21 to limit the drive of the working device 6, but if the electric work machine 1 is equipped with an electric motor 45 that outputs power to the traveling device 4 and the working device 6, the control device 30 (first control unit 30a) may control the inverter 51 to limit the drive of the working device 6. In more detail, if the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold, the control device 30 controls the inverter 51 to correct the power supplied from the battery 40a to the electric motor 45 for the working device 6 to zero, thereby limiting the drive of the working device 6.

[0084] The connection structure 60 of the battery 40a described above comprises a first transmission part 70 having a second connector 72 that is removably connected to a first connector 41 of the battery 40a that is detachably provided on the electric working machine 1; a second transmission part 80 that is electrically connected to an electrical device 50 that is provided on the electric working machine 1 and receives power from the battery 40a; and a connection device 90 that electrically connects the first transmission part 70 and the second transmission part 80, wherein the first transmission part 70 has a first terminal 73 that has a first opening 75 formed therein and is electrically connected to the second connector 72, and the connection device 90 has a first shaft member 93 that is inserted into the first opening 75 and has a second terminal 92 that is electrically connected to the second transmission part 80, and a first fixing device 77 that is attached to the first shaft member 93 to fix the first terminal 73 and the second terminal 92 and that is removed from the first shaft member 93 to release the fixation between the first terminal 73 and the second terminal 92.

[0085] According to the above configuration, even when the battery 40a of the electric operating machine 1 is attached or detached, the connection device 90 can release the fixation between the first terminal 73 and the second terminal 92 without inserting or removing the second connector 72 into or from the first connector 41, thereby preventing damage to the first connector 41. In other words, it is possible to prevent the battery 40a from becoming unusable due to damage to the first connector 41. Furthermore, because of the simple structure in which the first terminal 73 is inserted into the first shaft member 93 and the first terminal 73 and the second terminal 92 are fixedly connected by the first fastener 77, it is possible to prevent deterioration of the first terminal 73 and the second terminal 92 even when the first terminal 73 and the second terminal 92 are repeatedly fixed and released.

[0086] In addition, the first transmission part 70 has a plurality of first terminals 73 and a support part 76 that supports the plurality of first terminals 73 at a distance from each other in a direction perpendicular to the opening direction of the first opening 75, and the connection device 90 has a plurality of second terminals 92 that correspond to the plurality of first terminals 73, respectively. According to the above configuration, even when there are a plurality of first terminals 73 and a plurality of second terminals 92, the worker can easily connect the first terminals 73 to the second terminals 92. This improves the workability when attaching and detaching the battery 40a.

[0087] Furthermore, among the multiple first terminals 73, the inner diameter R1 of the first opening 75 of the positive electrode first terminal 73a and the inner diameter R2 of the first opening 75 of the negative electrode first terminal 73b are different in size, the outer diameters R5 and R6 of the first shaft member 93 correspond to the inner diameters R1 and R2 of the first openings 75, and the outer diameter R5 of the first shaft member 93a inserted into the first opening 75 of the positive electrode first terminal 73a and the outer diameter R6 of the first shaft member 93b inserted into the first opening 75 of the negative electrode first terminal 73b are different in size.

[0088] According to the above configuration, it is possible to easily prevent an operator from connecting the first terminal 73 with the wrong polarity, ie, the positive electrode and the negative electrode. The first shaft member 93 is a stud bolt, and the first fixing device 77 is a The nut 77a is fastened to the nut 77b. According to the above configuration, the worker can simply and reliably connect the first terminal 73 and the second terminal 92 by tightening the nut 77a.

[0089] The first terminal 73 is a round terminal. According to the above configuration, even if the first terminal 73 deteriorates, it can be easily replaced. The second transmission part 80 also has a fourth connector 82 that is removably connected to the third connector 54 of the electrical equipment 50, and a third terminal 83 that has a second opening 85 formed therein and is electrically connected to the fourth connector 82, and the connection device 90 has a second axial member 96 that is inserted into the second opening 85 and has a fourth terminal 95 that is electrically connected to the second terminal 92, and a second fixing device 87 that is attached to the second axial member 96 to fix the third terminal 83 and the fourth terminal 95 and that is removed from the second axial member 96 to release the fixation between the third terminal 83 and the fourth terminal 95.

[0090] According to the above configuration, even when switching to an electric device 50 of a different standard, the electric device 50 can be easily connected without the need for a dedicated harness with a special connector. The second shaft member 96 is a stud bolt, and the second fastener 87 is a nut 87a that is fastened to the second shaft member 96. According to the above configuration, the worker can easily and reliably connect the third terminal 83 and the fourth terminal 95 by tightening the nut 87a.

[0091] The second terminal 92 is a round terminal. According to the above configuration, even if the second terminal 92 deteriorates, it can be easily replaced. The electric work machine 1 also includes a connection structure 60 for the battery 40a, an electric device 50, a vehicle body 2 on which the electric device 50 is mounted, an attachment portion 40b for removably attaching the battery 40a to the vehicle body 2, and an electric motor 45 mounted on the vehicle body 2 and driven by power supplied from the battery 40a.

[0092] According to the above configuration, it is possible to realize an electric operating machine 1 that exhibits the above-mentioned unique effects. The connection device 90 also includes a temperature detection unit 34 that detects the temperature at or near the second terminal 92, and an alarm device 35 that alerts an operator if the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold value.

[0093] According to the above configuration, if the connection between the first terminal 73 and the second terminal 92 is insufficient or if the first terminal 73 or the second terminal 92 is deteriorated, the temperature of the second terminal 92 or the vicinity of the second terminal 92 detected by the temperature detection unit 34 will rise, and an abnormality can be reported based on the temperature information. The electric work machine 1 also includes a control device 30 that controls the electric motor 45, and a temperature detection unit 34 that is provided in the connection device 90 and detects the temperature at or near the second terminal 92, and the electrical equipment 50 includes an inverter 51 that controls the power supplied from the battery 40a to the electric motor 45, and when the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold, the control device 30 controls the inverter 51 to reduce the power supplied to the electric motor 45.

[0094] According to the above configuration, when the connection between the first terminal 73 and the second terminal 92 is insufficient or when the first terminal 73 or the second terminal 92 is deteriorated, the power supplied from the battery 40a to the electric motor 45 can be reduced to suppress heat generation in the second terminal 92. The electric work machine 1 also includes a traveling device 4 that is provided on the vehicle body 2 and driven by power generated by an electric motor 45, a work device 6 that is provided on the vehicle body 2 and driven by power generated by the electric motor 45, a control device 30 that controls the traveling device 4 and the work device 6, and a temperature detection unit 34 that is provided on the connection device 90 and detects the temperature at or near the second terminal 92, and the control device 30 allows the traveling device 4 to be driven and restricts the drive of the work device 6 when the temperature detected by the temperature detection unit 34 exceeds a predetermined threshold.

[0095] According to the above configuration, if the connection between the first terminal 73 and the second terminal 92 is insufficient or if the first terminal 73 or the second terminal 92 is deteriorated, the operation of the working device 6 is stopped to reduce the power consumption of the electric motor 45 and reduce the power supplied from the battery 40a to the electric motor 45, thereby suppressing heat generation in the second terminal 92. In addition, the second transmission unit 80 has a fourth connector 82 that is detachably connected to the third connector 54 of the electrical equipment 50, and the electrical equipment 50 includes either an inverter 51 that drives the electric motor 45 using power supplied from the battery 40a, or a DC / DC converter 52 that converts the voltage of the power supplied from the battery 40a.

[0096] According to the above configuration, even when the battery 40a of the electric operating machine 1 is attached or detached, the fourth connector 82 is not inserted or removed from the third connector 54 of the electric device 50, and therefore, damage to the third connector 54 can be prevented. In other words, damage to the third connector 54 can be prevented from rendering the inverter 51 and the DC / DC converter unusable. [Second embodiment] FIG. 5 shows another embodiment (second embodiment) of the connection structure 60 for the battery 40a. In the first embodiment, the second transmission unit 80 has a plurality of third terminals 83, and the connection device 90 has a plurality of fourth terminals 95. However, it is sufficient that at least the first transmission unit 70 has the first terminal 73, and the connection device 90 has the second terminal 92. As shown in FIG. 5, in the second embodiment, the second transmission unit 80 has a fifth connector 88 instead of the plurality of third terminals 83, and the connection device 90 has a sixth connector 89 instead of the plurality of fourth terminals 95. Hereinafter, the connection structure 60 for the battery 40a of the second embodiment will be described, focusing on configurations that differ from the above-described embodiment (first embodiment). Configurations that are common to the first embodiment will be assigned the same reference numerals and will not be described in detail.

[0097] The fifth connector 88 is a connecting member provided at the other end of the pair of second electric wires 81, and includes a positive terminal and a negative terminal. The positive terminal of the fifth connector 88 is electrically connected to the second electric wire 81 that constitutes the P line. The negative terminal of the sixth connector 89 is electrically connected to the second electric wire 81 that constitutes the N line. The sixth connector 89 is a connection member provided in the connection device 90, and includes a positive terminal and a negative terminal. The positive terminal of the sixth connector 89 is electrically connected to the positive conductive member 98. The negative terminal of the sixth connector 89 is electrically connected to the negative conductive member 98.

[0098] 3A, the connection device 90 of the second embodiment shown in Fig. 5 can omit the fourth terminal 95, thereby reducing the size of the base portion 91. Furthermore, because the fourth terminal 95 can be omitted, it is possible to prevent an operator from erroneously connecting the first terminal 73 to the fourth terminal 95. [Third embodiment] 6 shows another embodiment (third embodiment) of the connection structure 60 for the battery 40a. In the first embodiment, the connection device 90 has the fourth terminal 95, but the second terminal 92 may also serve as the fourth terminal 95. In such a case, the first terminal 73 and the third terminal 83 are attached to the second terminal 92. Hereinafter, the connection structure 60 for the battery 40a of the third embodiment will be described, focusing on the configurations that differ from the above-described embodiments (first and second embodiments). Configurations that are common to the first and second embodiments will be assigned the same reference numerals and will not be described in detail.

[0099] As shown in Fig. 6, the third embodiment shows a case in which the battery unit 40 has two batteries 40a. That is, in the example shown in Fig. 6, there are two first transmission parts 70 and four first terminals 73, and therefore four second terminals 92 are provided on the base part 91. Therefore, the worker inserts the first shaft member 93 into the first opening 75 of the first terminal 73 and the second opening 85 of the third terminal 83, attaches the first fastener 77 (nut) to the first shaft member 93, and tightens it with a predetermined torque to fasten the first terminal 73 and the third terminal 83 together.

[0100] In the example shown in FIG. 6, four second terminals 92 are provided on the base portion 91. However, the first terminal 73 and the third terminal 83 may be fixedly connected to each other to form contact points. It is sufficient that the base portion 91 has at least one or more second P terminals 92a and one or more second N terminals 92b. In such a case, the first P terminals 73a of all first transmission portions 70 and the third P terminals 83a of all second transmission portions 80 of the connection structure 60 of the battery 40a may be fastened together to a single second P terminal 92a, and the first N terminals 73b of all first transmission portions 70 and the third N terminals 83b of all second transmission portions 80 may be fastened together to a single second N terminal 92b.

[0101] Therefore, compared to the connection device 90 of the first embodiment shown in FIG. 3A, the connection device 90 of the third embodiment shown in FIG. 6 can omit the fourth terminal 95, thereby allowing the size of the base portion 91 to be smaller. The above-mentioned second transmission part 80 has a fourth connector 82 that is detachably connected to the third connector 54 of the electrical equipment 50, and a third terminal 83 that has a second opening 85 formed therein and is electrically connected to the fourth connector 82, and the first shaft member 93 is inserted through the first opening 75 and the second opening 85, and the first fixing device 77 fixedly connects the first terminal 73, the second terminal 92, and the third terminal 83.

[0102] According to the above configuration, it is possible to configure the connection device 90 compactly. Therefore, the connection structure 60 for the battery 40a can be easily adopted even in an electric operating machine 1 in which the space for installing the connection device 90 is narrow. [Fourth embodiment] 7A to 7C show another embodiment (fourth embodiment) of the connection structure 60 for the battery 40a. In the first to third embodiments described above, the first fastener 77 is a nut 77a attached to the first shaft member 93 (stud bolt), but the first fastener 77 is not limited to the nut 77a as long as it is attached to at least the first shaft member 93 to fasten the first terminal 73 and the second terminal 92 together and can be removed from the first shaft member 93 to release the fastening of the first terminal 73 and the second terminal 92. Similarly, the second fastener 87 is not limited to the nut 77a.

[0103] Below, the connection structure 60 of the battery 40a in the fourth embodiment will be described, focusing on the configurations that differ from the above-mentioned embodiments (first to third embodiments), and the configurations that are common to the first to third embodiments will be given the same symbols and detailed explanations will be omitted. 7A to 7C, the second terminals 92 and the fourth terminals 95 are spaced apart from each other and arranged in a straight line at one end of the base portion 91. In the fourth embodiment, the first fixture 77 includes a fixing bracket 77b and a pair of nuts 77c.

[0104] The fixed bracket 77b is a long, plate-like member, and its outer circumferential surface is insulated. The longitudinal length of the fixed bracket 77b is longer than the distance between the terminals (the second terminals 92 or the fourth terminals 95) at both ends of the plurality of second terminals 92 and the plurality of fourth terminals 95 provided on the base portion 91. The fixed bracket 77b also has a plurality of insertion holes 77b1. The plurality of insertion holes 77b1 are holes through which the first shaft member 93 or the second shaft member 96 is inserted, and are formed at positions corresponding to the first shaft member 93 or the second shaft member 96. The number of the plurality of insertion holes 77b1 is equal to the total number of the second terminals 92 and the plurality of fourth terminals 95 provided on the base portion 91. In the example shown in FIGS. 7A to 7C, the plurality of second terminals 92 and the plurality of fourth terminals 95 are arranged in a straight line, and therefore the plurality of insertion holes 77b1 are also formed in a straight line.

[0105] The pair of nuts 77c are attached to the terminals at both ends (the second terminal 92 or the fourth terminal 95) of the plurality of second terminals 92 and the plurality of fourth terminals 95 provided on the base portion 91. That is, as shown in FIG. 7C , the worker inserts the first shaft member 93 into the first opening 75 of the first terminal 73, and inserts the second shaft member 96 into the second opening 85 of the third terminal 83. Then, with the first shaft member 93 inserted into the first opening 75 and the second shaft member 96 inserted into the second opening 85, the worker inserts the first shaft member 93 or the second shaft member 96 into the plurality of insertion holes 77b1, respectively, and attaches the nuts 77c to the shaft members at both ends (the first shaft member 93 or the second shaft member 96) and tightens them with a predetermined torque.

[0106] As a result, the fixing bracket 77b presses the first terminal 73 against the second terminal 92, thereby forming a contact point between the first terminal 73 and the second terminal 92. Furthermore, the fixing bracket 77b presses the third terminal 83 against the fourth terminal 95, thereby forming a contact point between the third terminal 83 and the fourth terminal 95. Therefore, by attaching the fixing bracket 77b to the shaft members at both ends (the first shaft member 93 or the second shaft member 96) with the nuts 77c, the first terminal 73 and the second terminal 92 can be fixedly connected, and the third terminal 83 and the fourth terminal 95 can be fixedly connected.

[0107] In addition, the worker can release the fixation of all terminals (first terminal 73 or third terminal 83) fixedly connected to the fixing bracket 77b by removing the nuts 77c at both ends from the shaft members at both ends (first shaft member 93 or second shaft member 96), thereby improving workability. In the above-described embodiment, an example was given of a configuration in which the first fixing device 77 also serves as the second fixing device 87, but the first fixing device 77 may be configured to group together at least two or more first terminals 73 and fixedly connect them to the second terminals 92 using a common member, or may be configured to fixedly connect the first terminals 73 and the second terminals 92 and the third terminals 83 and the fourth terminals 95.

[0108] Furthermore, the shape of the fixed bracket 77b is not limited to the shapes shown in Figures 7B and 7C, and may be, for example, a shape in which the edge is bent toward the base portion 91 and also serves as a case that surrounds the first to fourth terminals 73, 83, 92, and 94. Furthermore, it is sufficient that the fixing bracket 77b is attached to the base portion 91 to fixedly connect the first terminal 73 and the second terminal 92 and to fixedly connect the third terminal 83 and the fourth terminal 95, and the nut 77c may be attached to a stud bolt provided on the base portion 91 instead of to the shaft members at both ends (the first shaft member 93 or the second shaft member 96). Furthermore, the fixing bracket 77b may be attached to the base portion 91 by a fastening member such as a bolt instead of the nut 77c.

[0109] Although the present invention has been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0110] 1 Electric work equipment (tractor) 2. Body 4 Running gear 6. Work equipment 30 Control device 34 Temperature detection unit 35 Alarm device 40a battery 40b Mounting part 41 First Connector 45 Electric Motor 50 Electrical Equipment 51 Inverter 52 DC / DC converter 54 Third Connector 60 Connection structure 70 First Transmission Section 72 Second Connector 73 1st terminal 73a First positive terminal (first P terminal) 73b Negative first terminal (first N terminal) 75 First Opening 76 Support part (1st support part) 77 1st fixture 77a Nut 80 Second Transmission Section 82 4th Connector 83 3rd terminal 85 Second Opening 87 Second fixture 87a Nut 90 Connection Device 92 2nd terminal 93 First shaft member 93a: Positive first shaft member (first P shaft) 93b Negative electrode first shaft member (first N-shaft) 95 4th terminal 96 2nd shaft member R1~R4 inner diameter R5~R8 Outer diameter

Claims

1. a first transmission unit having a second connector that is detachably connected to a first connector of a battery that is detachably provided on the electric operating machine; a second transmission unit provided in the electric working machine and electrically connected to an electric device that receives power from the battery; a connection device that electrically connects the first transmission unit and the second transmission unit; Equipped with the first transmission portion has a first terminal formed with a first opening and electrically connected to the second connector; The connection device is a second terminal including a first shaft member inserted into the first opening, the second terminal being electrically connected to the second transmission portion; a first fixing device that is attached to the first shaft member to fix the first terminal and the second terminal together and that is removed from the first shaft member to release the fixation between the first terminal and the second terminal; A battery connection structure having the above structure.

2. The first transmission unit is A plurality of the first terminals; a support portion that supports the plurality of first terminals at intervals in a direction perpendicular to the opening direction of the first opening; and 2. The battery connection structure according to claim 1, wherein the connection device has a plurality of the second terminals corresponding to the plurality of the first terminals, respectively.

3. Among the plurality of first terminals, an inner diameter of the first opening of the first terminal of a positive electrode and an inner diameter of the first opening of the first terminal of a negative electrode are different in size, an outer diameter of the first shaft member corresponding to an inner diameter of the first opening, The outer diameter of the first shaft member inserted into the first opening of the first terminal of the positive electrode and the outer diameter of the first shaft member inserted into the first opening of the first terminal of the negative electrode are different in size.

3. The battery connection structure according to claim 2, wherein

4. the first shaft member is a stud bolt, 4. The battery connection structure according to claim 1, wherein the first fastener is a nut fastened to the first shaft member.

5. 5. The battery connection structure according to claim 4, wherein the first terminal is a round terminal.

6. The second transmission unit is a fourth connector detachably connected to the third connector of the electrical device; a third terminal having a second opening formed therein and electrically connected to the fourth connector; and The connection device is a fourth terminal including a second shaft member inserted into the second opening, the fourth terminal being electrically connected to the second terminal; a second fixing device that is attached to the second shaft member to fix the third terminal and the fourth terminal together and that is removed from the second shaft member to release the fixation between the third terminal and the fourth terminal; 2. The battery connection structure according to claim 1, further comprising:

7. the second shaft member is a stud bolt, The battery connection structure according to claim 6 , wherein the second fastener is a nut fastened to the second shaft member.

8. The second transmission unit is a fourth connector detachably connected to the third connector of the electrical device; a third terminal having a second opening formed therein and electrically connected to the fourth connector; and the first shaft member is inserted through the first opening and the second opening, The battery connection structure according to claim 1 , wherein the first fixing member fixedly connects the first terminal, the second terminal, and the third terminal.

9. 9. The battery connection structure according to claim 6, wherein the second terminal is a round terminal.

10. The battery connection structure according to claim 1; The electrical device; a vehicle body provided with the electrical equipment; a mounting portion for detachably mounting the battery to the vehicle body; an electric motor provided on the vehicle body and driven by power supplied from the battery; An electric work machine equipped with:

11. a temperature detection unit provided in the connection device and configured to detect a temperature at or near the second terminal; an alarm device that notifies an operator when the temperature detected by the temperature detection unit exceeds a predetermined threshold; The electric operating machine according to claim 10, further comprising:

12. a control device for controlling the electric motor; a temperature detection unit provided in the connection device and configured to detect a temperature at or near the second terminal; Equipped with the electric device includes an inverter that controls power supplied from the battery to the electric motor; The electric operating machine according to claim 10, wherein the control device controls the inverter to reduce the power supplied to the electric motor when the temperature detected by the temperature detection unit exceeds a predetermined threshold value.

13. a traveling device provided on the vehicle body and driven by power generated by the electric motor; a working device that is provided on the vehicle body and driven by power generated by the electric motor; a control device that controls the traveling device and the working device; a temperature detection unit provided in the connection device and configured to detect a temperature at or near the second terminal; Equipped with The electric work machine according to claim 10 , wherein the control device permits driving of the traveling device and restricts driving of the work device when the temperature detected by the temperature detection unit exceeds a predetermined threshold value.

14. the second transmission unit has a fourth connector that is detachably connected to a third connector of the electrical device, The electric working machine according to any one of claims 10 to 13, wherein the electrical equipment includes either an inverter that drives the electric motor using power supplied from the battery, or a DC / DC converter that converts the voltage of the power supplied from the battery.

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