Electrically powered work machine

Abstract

The electric work machine has a body, which includes a battery (112A-112D), an electric motor, and an inverter that supplies power from the battery (112A-112D) to the electric motor. The electric work machine also includes a hub box (151A11, 151A12) connected to the battery (112A-112D), and a hub box (151B1) connected to the hub box (151A11, 151A12) and the inverter. An output section in the hub box (151A11, 151A12) outputs power to the hub box (151B1). The input section of the hub box (151B1) receiving input from the hub boxes (151A11, 151A12) and the output section of the hub box (151B1) outputting to the inverter are respectively provided with connectors (151S), connector (152N), and connector (152S). The connection between the hub boxes (151A11, 151A12) and the hub box (151B1), and the connection between the hub box (151B1) and the inverter are made via connectors (151S), connectors (152N), and connectors (152S) and through cables (154). Thus, an electric work machine that allows for easy modification of the system output is provided.

Description

Technical Field

[0001] This invention relates to electric work machinery, and more particularly to electric work machinery having a power relay device that relays power when supplying power from a battery to an inverter. Background Technology

[0002] Recently, from an environmental perspective, electric work machinery that operates using electricity is being used. One method of driving this machinery involves obtaining a portion of the power used from a battery mounted on the machine. In this case, the direct current from the battery is converted to alternating current by an inverter, thereby actuating the electric motor and operating the machinery. Furthermore, there are cases where a power relay device is used to relay power from the battery to the inverter.

[0003] Patent Document 1 discloses a structure in which the main body of an engineering machine is provided with a power supply device, which includes: a main battery; an auxiliary battery that receives, stores and outputs the surplus power from the main battery; an inverter with an output section that converts DC current into AC current; and a repeater sandwiched between the main battery and the auxiliary battery, which transmits the surplus power from the main battery to the auxiliary battery to prevent backflow, and transmits the stored power from the auxiliary battery to the inverter when needed. Existing technical documents Patent documents

[0004] Patent Document 1: Japanese Patent Application Publication No. 11-8945 Summary of the Invention

[0005] When performing operations such as digging and driving using electric work machinery, the work is usually carried out under the load designed according to the rated output. However, there are sometimes situations where it is necessary to carry out the work under heavy loads that cannot be handled by the rated output. For electrically powered work machines, the system output can be temporarily set above the rated value by changing the number of batteries used as the power source, thus enabling operation under heavy loads. However, when the system output is changed by increasing or decreasing the number of batteries, the resulting change in vehicle weight can shift the vehicle's center of gravity, impairing vehicle stability and potentially affecting operation. Furthermore, changes to the output may also require changes to the wiring connected to the battery. However, changing the wiring according to the work is cumbersome, and there is also a risk of electric shock to the operator from touching the battery terminals. The present invention was made in view of this problem, and its object is to provide an electric work machine that allows for easy modification of the system output.

[0006] To address the aforementioned issues, the electric work machine of the present invention has a body comprising a battery, an electric motor, and an inverter that supplies power from the battery to the electric motor. The electric work machine includes a first power relay connected to the battery and a second power relay connected to both the first power relay and the inverter. Connectors are provided at the output section of the first power relay supplying power to the second power relay, the input section of the second power relay supplying power from the first power relay, and the output section of the second power relay supplying power to the inverter. Connections between the first and second power relays, and between the second power relay and the inverter, are made via these connectors and cables. In this case, an electric work machine can be provided that provides multiple power relays supplying power from the battery to the inverter, and replaces power relays not directly connected to the battery with devices having wiring directly connected to the battery, thereby allowing for easy modification of the system output.

[0007] Here, for example, the battery and the first power relay are connected via terminals or connectors provided on each of the battery and the first power relay, and by cables. In this case, the connection between the battery and the first power relay can be easily made. Alternatively, for example, the output section of the battery that outputs to the first power relay is a terminal, and the input section of the first power relay that receives input from the battery is a connector. In this case, it is easier to connect the battery to the first power relay. Furthermore, for example, if there are multiple batteries, the first power relay device is connected to each of the multiple batteries, and the second power relay device changes the series and parallel connections of the multiple batteries. In this case, it is easy to make appropriate changes to the output corresponding to the operation. Furthermore, for example, if there are multiple batteries, a first power relay device is connected to each of the multiple batteries, and a second power relay device changes the number of batteries connected in parallel. In this case, when a battery becomes unusable due to a malfunction, it can be disconnected. Alternatively, for example, the second power relay can be positioned outwards from the center of the vehicle body compared to the first power relay. In this case, the second power relay can be easily replaced. Furthermore, for example, in a vehicle body-mounted cover, a maintenance access panel is provided on the cover, and the second power relay device is located closer to the access panel than the first power relay device. In this case, the second power relay device can be easily replaced using the access panel. Furthermore, for example, an insulation degradation sensor is provided at the second power relay device to monitor the insulation resistance between the vehicle body and the battery. In this case, even for electric construction machinery used to increase or decrease the system output, the situation of reduced circuit insulation can be easily detected. Invention Effects

[0008] According to the present invention, an electric work machine with easily modifiable system output can be provided. Attached Figure Description

[0009] Figure 1 This is a diagram illustrating the electric excavator of this embodiment. Figure 2 (a) is a diagram showing the first example of wiring between a high-voltage battery and a hub box. Figure 2 (b) is a diagram showing the first example of wiring inside the hub box. Figure 3 (a) is a second example of the wiring between the high-voltage battery and the hub box. Figure 3 (b) is a second example of the wiring inside the hub box. Figure 4 (a) is a diagram representing the third example of wiring between the high-voltage battery and the hub box, as well as wiring inside the hub box. Figure 4 (b) is the fourth example of the wiring between the high-voltage battery and the hub box, as well as the wiring inside the hub box. Figure 5 (a) is the fifth example of the wiring between the high-voltage battery and the hub box, as well as the wiring inside the hub box. Figure 5 (b) is the sixth example of the wiring diagram, which shows the wiring between the high-voltage battery and the hub box, as well as the wiring inside the hub box. Figure 6 Figures (a) through (c) are diagrams illustrating the wiring between the high-voltage battery and the hub box, as well as the wiring inside the hub box, in Example 7. Figure (a) shows the wiring between the high-voltage battery and the hub box. Figure 2 The same diagram shows the situation in (a). (b) is the first example showing the situation where the battery is disconnected. (c) is the second example showing the situation where the battery is disconnected. Figure 7 This is the third example of a situation where the battery is disconnected. Figure 8(a) to (d) are diagrams showing the location of the hub box in an electric excavator. Figure 9 (a) and (b) are diagrams showing the location of the hub box in an electric excavator. Figure 10 (a) and (b) are diagrams showing the locations where insulation degradation sensors are installed. Detailed Implementation

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0011] <Explanation of the composition of the electric excavator 100> Figure 1 This is a diagram showing the electric excavator 100 of this embodiment. Depend on Figure 1 The electric excavator 100 shown is an example of an electric work machine with a vehicle body. However, the electric work machine applicable to this embodiment is not limited to the electric excavator 100, and can also be a wheel loader, bulldozer, crane, or other construction machinery. Furthermore, the electric work machine can also be a dump truck for transporting sand and gravel. Moreover, for example, the electric work machine can be agricultural machinery such as a logging machine, a timber processing machine, a tractor, a forestry vehicle, or a timber harvester.

[0012] The electric excavator 100 shown in the figure is powered from the system power supply 400 via power cable 200. Additionally, the electric excavator 100 is also powered from a high-voltage battery 112. That is, the electric excavator 100 is configured to receive power from the system power supply 400 while simultaneously using power from its onboard battery. However, in this embodiment, the power supplied to the electric excavator 100 is not used; power is supplied solely from the high-voltage battery 112.

[0013] The electric excavator 100 has a high-voltage circuit 110, a vehicle control device 120, a hydraulic circuit 130, and an operating system 140. The electric excavator 100 shown in the figure controls the power supplied from the power cable 200 to the high-voltage circuit 110 via the vehicle control device 120, and drives the electric motor 118, which serves as the power source. The high-voltage circuit 110 includes: an AC / DC converter 111 that accepts power from the system power supply 400 and converts AC power supplied from the power cable 200 into DC power; a high-voltage battery 112, which is an example of a storage battery, for storing power; an inverter 117, which is an example of an inverter device, for converting DC power from the AC / DC converter 111 and the high-voltage battery 112 into AC power; an electric motor 118 that is driven by AC power supplied from the inverter 117; and a hub box 150.

[0014] The hub box 150 relays the power from the high-voltage battery 112 and supplies it to the inverter 117. The configuration of the hub box 150 will then be described in detail.

[0015] The vehicle control device 120 changes the power received from the system power supply 400 during the operation of the electric excavator 100. Furthermore, the AC / DC converter 111 adjusts the power received from the system power supply 400 (the upper limit of the received power). For example, the power received from the system power supply 400 can be adjusted by adjusting the resistance value within the current limiting circuit of the AC / DC converter 111. The vehicle control device 120 has a control calculation function unit 121, a data recording unit (memory) 122 and a communication function unit 123. The control calculation function unit 121 performs calculations for controlling the AC / DC converter 111, the high-voltage battery 112, and the inverter 117. Each of the AC / DC converter 111, the high-voltage battery 112, and the inverter 117 has a control unit (controller) 111CO, 112CO, and 117CO, respectively. The control units 111CO, 112CO, and 117CO send data indicating the status of the AC / DC converter 111, the high-voltage battery 112, and the inverter 117 to the control calculation function unit 121. Based on the received data, the control calculation function unit 121 performs calculations and sends control signals for controlling the AC / DC converter 111, the high-voltage battery 112, and the inverter 117 to the control units 111CO, 112CO, and 117CO. When adjusting the power received from the system power supply 400, the vehicle control device 120 sends a command, and the control unit 111CO of the AC / DC converter 111 receives the command. Furthermore, the settings of the AC / DC converter 111 are changed, thereby altering the power received from the system power supply 400. The data recording unit (memory) 122 records program data used to control the arithmetic function unit 121 to perform operations. The communication function unit 123 is a communication interface used when sending control signals to the control units 111CO, 112CO, and 117CO.

[0016] The hydraulic circuit 130 includes a hydraulic pump 131 for generating hydraulic pressure, a working oil tank 132 for storing working oil, a first directional control valve 133, and a second directional control valve 134. The hydraulic pump 131 is a variable capacity hydraulic pump driven by the electric motor 118. The hydraulic pump 131 draws working oil from the working oil tank 132 and supplies working oil to the swing motor 14 and the hydraulic cylinder 16 of the working device of the electric excavator 100 via the first directional control valve 133 and the second directional control valve 134, so as to make the electric excavator 100 move.

[0017] The operating system 140 is located in the cab of the electric excavator 100 and is used by the operator when operating the electric excavator 100. The operating system 140 includes a work mode selection switch, a motor control dial (not shown) for setting the speed of the electric motor 118, and operating levers 141A and 141B. The operating levers 141A and 141B correspond to each rotary motor 14 and the hydraulic cylinder 16 for the working device. For example, an electric lever is used to output an electrical operating signal (lever signal Lv) corresponding to the operating amount.

[0018] <Explanation of the construction of hub box 150> Next, the composition of the hub box 150 will be described in detail. Figure 2 Figures (a) and (b) show a first example of wiring between the high-voltage battery 112 and the hub box 150, and wiring inside the hub box 150. Figure 2 In (a), on the left side of the figure, four batteries, namely batteries 112A to 112D, are shown as high-voltage storage batteries 112. In addition, from the center to the right side of the figure, hub boxes (A), namely hub boxes 151A11 and 151A12, and hub box (B), namely hub box 152B1, are shown as hub boxes 150.

[0019] Batteries 112A-112D are connected to hub boxes 151A11 and 151A12 by eight cables 153. In this case, the eight cables 153 are connected using terminals 112T and connectors 151N. Two terminals 112T are provided on each of batteries 112A-112D, and four connectors 151N are provided on each side (left side of the figure) of hub boxes 151A11 and 151A12. Alternatively, while batteries 112A-112D are connected to cables 153 via terminals 112T, they can also be connected via connectors (not shown) provided on batteries 112A-112D.

[0020] Hub boxes 151A11 and 151A12 are connected to hub box 152B1 by four cables 154. In this case, the four cables 154 are connected by connectors 151S, which are provided on the other side of hub boxes 151A11 and 151A12 (right side in the figure), and connectors 152N, which are provided on one side of hub box 152B1 (left side in the figure).

[0021] Furthermore, although not shown in the figure, a cable connecting to the inverter 117 side is located on the right side of the hub box 152B1. This cable is connected using two connectors 152S located on the other side of the hub box 152B1 (right side of the figure).

[0022] In this configuration, the power supplied from batteries 112A to 112D is transmitted to inverter 117 in the order of hub box 151A11 or hub box 151A12, hub box 152B1. Thus, hub box 150 serves as a power relay device that relays the power from batteries 112A to 112D and supplies it to inverter 117.

[0023] Figure 2 The configuration of the hub box 150 shown in (a) can also be explained as follows. Hub boxes 151A11 and 151A12 function as the first power relay devices connected to batteries 112A to 112D. Hub box 152B1 functions as the second power relay device connected to the first power relay devices, namely hub boxes 151A11 and 151A12, and inverter 117. Connectors are provided at the output sections of hub boxes 151A11 and 151A12 that output to hub box 152B1, the input sections of hub box 152B1 that receive input from hub boxes 151A11 and 151A12, and the output sections of hub box 152B1 that output to inverter 117. These connectors are connector 151S, connector 152N, and connector 152S. The connections between hub boxes 151A11, 151A12 and hub box 152B1, and between hub box 152B1 and inverter 117, are made via connectors and cables. Specifically, the connection between hub boxes 151A11, 151A12 and hub box 152B1 is made via connectors 151S and 152N and cable 154. Furthermore, the connection between hub box 152B1 and inverter 117 is made via connector 152S and the aforementioned cable connected to inverter 117. Batteries 112A-112D are connected to hub boxes 151A11 and 151A12 via terminals or connectors provided on each of the batteries 112A-112D and hub boxes 151A11 and 151A12, and via cable 153. However, Figure 2 In (a), the output part of the batteries 112A to 112D that outputs to the hub boxes 151A11 and 151A12 is terminal 112T, and the input part of the hub boxes 151A11 and 151A12 that receives input from the batteries 112A to 112D is connector 151N.

[0024] and Figure 2Compared to (a), Figure 2 (b) shows the case where hub box 152B1 is replaced with hub box 152B2. Hub box 152B2 has the same number and location as hub box 152B1 and connector 152N, but its internal wiring configuration is different. Hub boxes 152B1 and B2 are freely detachable, allowing hub box 152B1 to be replaced with hub box 152B2. Conversely, hub box 152B2 can also be replaced with hub box 152B1. That is, in hub box 150, the wiring configuration of hub boxes 151A11 and 151A12 is fixed, but hub boxes 152B1 and 152B2 can be replaced with hub boxes having different wiring configurations.

[0025] Furthermore, in Figure 2 In (a), the wiring for the four batteries 112A to 112D can be configured as a double series-double parallel connection. Thus, the voltage of two batteries is output from the hub box 150 to the inverter 117. On the other hand, Figure 2 In (b), the wiring for the four batteries 112A to 112D can be configured as four in series (four in series and one in parallel). Thus, the voltage of the four batteries is output from the hub box 150 to the inverter 117.

[0026] Right now, Figure 2 Methods (a) and (b) can be described as follows: hub boxes 151A11 and 151A12 are connected to multiple batteries 112A to 112D respectively, and hub boxes 152B1 and 152B2 change the series-parallel connection of the multiple batteries 112A to 112D. Alternatively, this method can be described as changing the series-parallel connection of batteries 112A to 112D by changing hub box 152B1 to a hub box with a different wiring configuration. In this case, hub boxes 151A11 and 151A12 serve to collect the voltage necessary for the operation of the electric excavator 100. Hub boxes 151A11 and 151A12 are provided to obtain the voltage necessary for the electric excavator 100 to operate at rated output. Furthermore, hub boxes 152B1 and 152B2 serve to make the voltage collected by hub boxes 151A11 and 151A12 variable. That is, when the electric excavator 100 is operated under normal conditions and at rated output, it is set to be used. Figure 2 The wiring status of hub box 152B1 in (a). On the other hand, when operations requiring heavy loads that cannot be handled by the rated output of electric excavator 100 are needed, Figure 2 (a) Replace hub box 152B1 with hub box 152B2 and set it to use Figure 2The wiring configuration of hub box 152B2 is shown in (b). Thus, without changing the number of batteries installed, the electric excavator 100 can be easily changed by simply replacing hub boxes 152B1 and 152B2, which are used as the second power relay device, in cases where the electric excavator 100 is operated at its normal rated output and in cases where the electric excavator is operated at a heavy load that cannot be handled by the rated output.

[0027] Furthermore, the first power relay devices, namely hub boxes 151A11 and 151A12, and the second power relay devices, namely hub boxes 152B1 and 152B2, are connected via connectors 151S and 152N, thereby facilitating the removal and reconnection of cable 154. This simplifies the wiring modification process. Specifically, since the first power relay devices, namely hub boxes 151A11 and 151A12, and the second power relay devices, namely hub boxes 152B1 and 152B2, are connected via connectors 151S and 152N, the removal and reconnection of cable 154 is easy without needing to open hub boxes 151A11, 151A12, hub boxes 152B1 and 152B2, or use tools to change the terminal connections of cable 154. Furthermore, when changing the system output, the operator only needs to disconnect and reconnect the cable 154 connected by the connector, and replace the second power relay device, i.e., the hub boxes 152B1 and 152B2, thus avoiding contact with the terminals 112T of the batteries 112A to 112D. Therefore, electric shock from the batteries 112A to 112D can be prevented. Furthermore, even if hub box 152B1 is replaced with hub box 152B2, the connectors 151S and 152N used for connection can each use four cables 154, which are set in the same number and in the same position. Therefore, it is possible to prevent the cables 154 from being connected to the wrong connectors, and the safety is also excellent. Furthermore, it can be said that the above applies to the cables connecting hub boxes 152B1 and 152B2 to the inverter 117 side as well.

[0028] Figure 3 (a) and (b) are diagrams showing the wiring of the high-voltage battery 112 to the hub box 150, and the wiring inside the hub box 150, as a second example. If Figure 3 (a), (b) and Figure 2 Comparing (a) and (b), then in Figure 3 In (a) and (b), the two hub boxes 151A11 and 151A12 are merged into one and become hub box 151A1. The points are different, but the other points are the same.

[0029] Figure 4Figure (a) is a third example showing the wiring between the high-voltage battery 112 and the hub box 150, as well as the wiring inside the hub box 150. This third example is the typical rated output ratio of the electric excavator 100. Figure 2 Example (a) shows a large rated output. If Figure 4 (a) and Figure 2 Comparing with (a), the high-voltage batteries 112 increase from four batteries 112A to 112D to six batteries 112A to 112F. Correspondingly, the hub boxes increase from two hub boxes 151A11 to 151A12 to three hub boxes 151A21 to 151A23. Furthermore, hub box 152B3, for the six batteries 112A to 112F, becomes a double-series, triple-parallel wiring configuration. Moreover, the number of cables 153 increases from eight to twelve, and the number of cables 154 increases from four to six.

[0030] Figure 4 Figure (b) is a fourth example showing the wiring between the high-voltage battery 112 and the hub box 150, as well as the wiring inside the hub box 150. This fourth example is an example where the typical rated output of the electric excavator 100 is further increased than that of the third example. If Figure 4 (b) and Figure 2 Comparing with (a), the number of high-voltage batteries 112 increases from four batteries 112A to 112D to eight batteries 112A to 112F. Correspondingly, the number of hub boxes increases from two hub boxes 151A11 to 151A12 to four hub boxes 151A31 to 151A34. Furthermore, hub box 152B4, for the eight batteries 112A to 112F, becomes a double-series, four-parallel wiring configuration. Moreover, the number of cables 153 increases from eight to sixteen, and the number of cables 154 increases from four to eight.

[0031] Figure 4 In (a), the six batteries 112A to 112F are connected in a two-series, three-parallel configuration. Thus, the voltage from two batteries is output from the junction box 150 to the inverter 117. Furthermore, Figure 4 In (b), the eight batteries 112A to 112H are connected in a double series and four parallel configuration. Thus, the voltage of two batteries is output from the hub box 150 to the inverter 117. Even in Figure 4 In cases (a) and (b), the series and parallel connection of batteries 112A to 112D can also be changed by replacing hub boxes 152B3 and 152B4 with hub boxes of different wiring configurations. Figure 4In case (a), by replacing the hub box 152B3, it is possible to configure the wiring as a six-series (six-series single-parallel) configuration, for example. Additionally, in Figure 4 In case (b), by replacing the hub box 152B4, it is possible to configure the wiring as either four-series double-parallel or eight-series (eight-series single-parallel).

[0032] Figure 5 (a) is a fifth example of a diagram showing the wiring of the high-voltage battery 112 and the hub box 150, as well as the wiring inside the hub box 150. In case 5, compared to case 3, the three hub boxes 151A21 to A23 are different in that they become one hub box 151A2, while the other points are the same. Figure 5 (b) is a sixth example of a diagram showing the wiring between the high-voltage battery 112 and the hub box 150, as well as the wiring inside the hub box 150. Compared to case 4, case 6 is... Figure 5 In (b), the four hub boxes 151A31 to A34 are different in that they become one hub box 151A3, while the other points are the same.

[0033] Figure 6 Figures (a) to (c) are the seventh example of the wiring of the high-voltage battery 112 and the hub box 150, as well as the wiring inside the hub box 150. in, Figure 6 (a) is with Figure 2 The same figure is shown in (a). Here, we envision a situation where at least one of batteries 112C and 112D becomes inoperable due to a malfunction or other reasons. In this case, we perform the operation of disconnecting batteries 112C and 112D.

[0034] Figure 6 (b) is the first example of a case where the batteries 112C and 112D are disconnected. Here, the following situation is indicated: by dismantling... Figure 6 The two lower cables 154 shown in (a) disconnect the batteries 112C and 112D, and are configured as a double series single parallel wiring. The cables 154 are connected to the hub boxes 151A12 and 152B1 via connectors, and can be easily installed and removed.

[0035] in addition, Figure 6 (c) is the second example of the case where the batteries 112C and 112D are disconnected. Here, we illustrate the following: By replacing hub box 152B1 with hub box 152B5, batteries 112C and 112D are disconnected, and the wiring is changed from a dual-series dual-parallel connection to a dual-series single-parallel connection. In this configuration, hub boxes 151A11 and 151A12 are connected to multiple batteries 112A to 112D respectively, while hub boxes 152B1 and 152B5 change the number of parallel connections of batteries 112A to 112D. Alternatively, in this configuration, by replacing hub box 152B1 with a hub box having a different wiring configuration, the number of connected batteries 112A to 112D is changed. Even in cases where a battery failure occurs and it is necessary to disconnect an unusable battery, only the disconnection and reconnection of cable 154 (connected by the connector) and the replacement of the second power relay devices, i.e., hub boxes 152B1 and 152B5, are required, thus simplifying the operation. Furthermore, the operator only needs to disconnect and reconnect the cable 154 connected by the connector, and replace the second power relay device, namely the hub boxes 152B1 and 152B5, thus avoiding contact with the terminals 112T of the batteries 112A to 112D. Therefore, electric shock from the batteries 112A to 112D can be prevented.

[0036] in addition, Figure 7 This is the third example of a situation where batteries 112C and 112D are disconnected. In this case, using a hub box 152B6 with two circuit breakers 152K inside the hub box 152B1, by setting the circuit breaker 152K to closed, it is possible to set it to be in harmony with... Figure 6 The same wiring is used for the hub box 152B5 of (c). Thus, it is possible to disconnect the batteries 112C and 112D and set them to a double series single parallel wiring configuration.

[0037] <Instructions on the location of hub box 150> Figure 8 (a) to (d) Figure 9 Figures (a) and (b) show the location of the hub box 150 in the electric excavator 100. In the figures, CAB is the cab. LIB is a lithium-ion battery, specifically the aforementioned storage battery. C / W is the counterweight. Furthermore, in the figures, the X direction is from the rear of the electric excavator 100 towards the front. The Y direction is from the right side of the electric excavator 100 towards the left. The Z direction is from below the electric excavator 100 towards above. in, Figure 8 Figures (a) to (d) show the position of the hub box 150 when viewed from above the electric excavator 100. Additionally, Figure 9Figures (a) and (b) show the location of the hub box 150 when viewed from the side of the electric excavator 100. Here, BOX_A refers to hub boxes 151A1-151A3, 151A11-151A12, 151A21-151A23, and 151A31-151A34, which are the first power relay devices described above. Furthermore, without distinguishing between hub boxes 151A1-151A3, 151A11-151A12, 151A21-151A23, and 151A31-151A34, they will sometimes be referred to simply as hub box 151 below. Additionally, BOX_B refers to hub boxes 152B1-152B6, which are the second power relay devices described above. Furthermore, without distinguishing between hub boxes 152B1-152B6, they will sometimes be referred to simply as hub box 152 below.

[0038] As by Figure 8 as well as Figure 9 As shown in the diagram, the hub box 152 is located at a position outward from the center O of the vehicle body compared to the hub box 151. Furthermore, the hub box 152 is positioned close to the access port 160 located on the vehicle body. The electric excavator 100 has a cover that forms part of the vehicle body, and the access port 160 is provided on the cover as an opening for maintenance. The access port 160 is equipped with doors, covers, etc., and is normally closed by these components, but is opened during maintenance or other procedures, thereby allowing access to the interior of the electric excavator 100. That is, from the viewpoint of ease of assembly and disassembly, it is preferable that the hub box 152 is located at a position that is outward from the center O of the vehicle body than the hub box 151 and close to the access port 160.

[0039] exist Figure 8 In case (a), the access panel 160 is located at the center of the right side of the vehicle body, and a hub box 152 is provided adjacent to the access panel 160. On the other hand, the hub box 151 is located inside the vehicle body compared to the hub box 152, and the hub box 152 is located at a position that is outside the hub box 151 relative to the center O of the vehicle body. In addition, the hub box 152 is located closer to the access panel 160 than the hub box 151.

[0040] exist Figure 8 In case (b), the access panel 160 is located on the front right side of the vehicle body, and a hub box 152 is provided adjacent to the access panel 160. On the other hand, the hub box 151 is located at the rear of the vehicle body compared to the hub box 152, and the hub box 152 is located at a position that is outward relative to the center O of the vehicle body compared to the hub box 151. In addition, the hub box 152 is located closer to the access panel 160 than the hub box 151.

[0041] exist Figure 8In case (c), the access panel 160 is located at the center of the left side of the vehicle body, and a hub box 152 is provided adjacent to the access panel 160. On the other hand, the hub box 151 is located closer to the right side of the vehicle body than the left side, and the hub box 152 is located on the outer side of the center O of the vehicle body than the hub box 151. In addition, the hub box 152 is located closer to the access panel 160 than the hub box 151.

[0042] exist Figure 8 In case (d), the access panel 160 is located at the rear right side of the vehicle body, and a hub box 152 is provided adjacent to the access panel 160. On the other hand, the hub box 151 is located at the center in the longitudinal direction of the vehicle body, and the hub box 152 is located at a position that is outward relative to the center O of the vehicle body compared to the hub box 151. In addition, the hub box 152 is located closer to the access panel 160 than the hub box 151.

[0043] exist Figure 9 In case (a), the access port 160 is located at the rear of the upper surface of the vehicle body, and the hub box 152 is provided adjacent to the access port 160. On the other hand, the hub box 151 is located at the center in the vertical direction of the vehicle body, and the hub box 152 is located at a position that is outward relative to the center O of the vehicle body compared to the hub box 151. In addition, the hub box 152 is located closer to the access port 160 than the hub box 151.

[0044] exist Figure 9 In case (b), the access port 160 is located at the rear of the lower surface of the vehicle body, and the hub box 152 is provided adjacent to the access port 160. On the other hand, the hub box 151 is located at the center in the vertical direction of the vehicle body, and the hub box 152 is located at a position that is outward relative to the center O of the vehicle body compared to the hub box 151. In addition, the hub box 152 is located closer to the access port 160 than the hub box 151.

[0045] <Description of Insulation Deterioration Sensor> The hub box 152 preferably has an insulation degradation sensor. The insulation degradation sensor is a sensor that monitors the insulation resistance between the vehicle body and the high-voltage battery 112, and has the function of outputting a warning signal when the insulation resistance deteriorates.

[0046] Figure 10 (a) and (b) are diagrams showing the configuration location of the insulation degradation sensor 152Z. in, Figure 10 (a) shows the insulation degradation sensor 152Z mounted on Figure 2 Example of hub box 152B1 shown in (a). Additionally, Figure 10 (b) shows the installation of the insulation degradation sensor 152Z on Figure 2 Example of hub box 152B2 shown in (b). In any case, insulation degradation sensor 152Z is ​​configured to be connected to transmission lines 152L1, 152L2 supplied to inverter 117.

[0047] As these examples illustrate, it is preferable that the insulation degradation sensor 152Z is ​​located in the hub box 152, rather than in the hub box 151. The insulation degradation sensor 152Z must be of a specification that matches the voltage used. That is, an insulation degradation sensor 152Z that matches the voltage output to the inverter 117 must be used. Figure 10 In case (a), it is a dual series-parallel connection, and the voltage used here is the voltage of the two batteries output to inverter 117 as described above. Additionally, in Figure 10 In case (b), four batteries are connected in series, and the voltage used here is the voltage of the four batteries output to the inverter 117 as described above. Furthermore, the hub box 152 has a circuit configuration for changing this voltage. Therefore, if insulation degradation sensors 152Z matching their respective operating voltages are installed in the hub box 152, it can be said that when the hub box 152 is replaced, the appropriate insulation degradation sensor 152Z is ​​automatically installed. In this case, compared to the insulation degradation sensor 152Z installed in the hub box 152B1, the insulation degradation sensor 152Z installed in the hub box 152B2 is selected with a higher voltage specification. Figure 10 In (a), the following situation is shown: 152Z is ​​used as an insulation degradation sensor, while a sensor that responds to the M (Middle) voltage is used. Figure 10 (b) shows the following situation: instead of the insulation degradation sensor 152Z which is a high voltage specification sensor, a sensor that is designed to withstand Hi voltage is used.

[0048] The above describes this embodiment, but the technical scope of the present invention is not limited to the scope described in the above embodiment. As can be seen from the description of the technical solution, embodiments that have undergone various changes or improvements to the above embodiment are also included in the technical scope of the present invention. Explanation of reference numerals in the attached figures

[0049] 100… Electric excavator, 110… High voltage circuit, 111… AC / DC converter, 112… High voltage battery, 112A~112H… Battery, 112T… Terminal, 151N, 151S, 152N, 152S… Connector, 117… Inverter, 120… Vehicle control device, 151A1~151A3, 151A11~151A12, 151A21~151A23, 151A31~151A34… Hub box (first power relay device), 152B1~152B6… Hub box (second power relay device), 152Z… Insulation degradation sensor, 153, 154… Cable, 160… Inspection port.

Claims

1. An electric work machine, comprising a body, The vehicle body includes a battery, an electric motor, and an inverter that supplies power from the battery to the electric motor. The electric work machinery is characterized by the following features: It has a first power relay device connected to the battery, and a second power relay device connected to the first power relay device and the inverter. The output section of the first power relay device that outputs to the second power relay device, the input section of the second power relay device that receives input from the first power relay device, and the output section of the second power relay device that outputs to the inverter are each provided with a connector. The connection between the first power relay and the second power relay, and the connection between the second power relay and the inverter, are made via the connector and through a cable.

2. The electric operating machinery according to claim 1, characterized in that, The battery and the first power relay are connected via terminals or connectors provided on each of the battery and the first power relay, and by cables.

3. The electric operating machinery according to claim 2, characterized in that, The output section of the battery that supplies power to the first power relay device is a terminal. The input section of the first power relay device, which receives power from the battery, is a connector.

4. The electric operating machinery according to claim 1, characterized in that, The storage battery is provided in multiple units. The first power relay device is connected to each of the multiple batteries. The second power relay device alters the series and parallel connections of the multiple batteries.

5. The electric operating machinery according to claim 1, characterized in that, The storage battery is provided in multiple units. The first power relay device is connected to each of the multiple batteries. The second power relay device changes the number of parallel connections of the multiple batteries.

6. The electric operating machinery according to claim 1, characterized in that, The second power relay device is located on the outer side relative to the center of the vehicle body compared to the first power relay device.

7. The electric operating machinery according to claim 1, characterized in that, It has a cover that becomes part of the exterior of the vehicle body. The cover is equipped with a maintenance access panel. The second power relay device is located closer to the maintenance port than the first power relay device.

8. The electric operating machinery according to claim 1, characterized in that, It has an insulation degradation sensor that monitors the insulation resistance between the vehicle body and the battery. The insulation degradation sensor is located in the second power relay device.

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