WO2021006031A1 - Construction machine - Google Patents

Construction machine Download PDF

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Publication number
WO2021006031A1
WO2021006031A1 PCT/JP2020/024569 JP2020024569W WO2021006031A1 WO 2021006031 A1 WO2021006031 A1 WO 2021006031A1 JP 2020024569 W JP2020024569 W JP 2020024569W WO 2021006031 A1 WO2021006031 A1 WO 2021006031A1
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WO
WIPO (PCT)
Prior art keywords
total voltage
circuit
battery
housing
connecting member
Prior art date
Application number
PCT/JP2020/024569
Other languages
French (fr)
Japanese (ja)
Inventor
渡辺　明
聡彦 渡邉
竹内　健
絢太 谷垣
春樹 杉山
Original Assignee
日立建機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日立建機株式会社 filed Critical 日立建機株式会社
Priority to JP2021530579A priority Critical patent/JP7166460B2/en
Publication of WO2021006031A1 publication Critical patent/WO2021006031A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H02G3/16—Distribution boxes; Connection or junction boxes structurally associated with support for line-connecting terminals within the box

Definitions

  • the present disclosure relates to construction machines such as hydraulic excavators, and particularly to construction machines equipped with a power storage device.
  • a hydraulic excavator representing a construction machine is provided with a self-propelled lower traveling body and an upper turning body mounted on the lower traveling body so as to be able to turn, and the vehicle body is composed of the lower running body and the upper turning body. There is.
  • a work device is provided on the front side of the upper swivel body so as to be able to move up and down, and excavation work and the like are performed by this work device.
  • hybrid hydraulic excavators equipped with two types of power sources, an engine and a generator / motor that assists the driving of the engine have been known for the purpose of improving fuel efficiency and reducing CO 2 emissions. ..
  • This hybrid hydraulic excavator has an assist power generation / electric motor that generates electricity by being rotationally driven by the engine or assists the rotation of the engine by supplying power, and an assist power generation / electric motor that assists the rotation of the engine. Is installed, or a power storage device that supplies the stored power to the electric motor is installed.
  • a battery-powered hydraulic excavator that does not have an engine and is provided with an electric motor driven by electric power supplied from a charged power storage device, and is operated by driving a hydraulic pump by this electric motor.
  • the power storage device used for these is usually composed of a housing, a plurality of batteries (lithium ion batteries, etc.) connected in series, a battery block unit housed in the housing, and a conductive circuit connected to the battery block unit. It is configured to include a circuit block unit housed in a housing.
  • the power storage device is provided with a relay that cuts off the electric circuit when it is not used as a power source, a service plug that cuts off the series connection between the batteries constituting the battery block portion at an intermediate potential, and the like. Therefore, the power of the power storage device can be cut off at an intermediate potential by removing the service plug during the assembly work and the disassembly work of the power storage device.
  • the power storage device mounted on a hybrid or battery type hydraulic excavator is large in size. Therefore, the power storage device is often discarded in a disassembled state, for example, in a housing, a battery block unit, a circuit block unit, a cooling device, or the like.
  • a disassembled state for example, in a housing, a battery block unit, a circuit block unit, a cooling device, or the like.
  • overseas there are some areas where lithium-ion batteries must be disassembled and discarded. Since the dismantling work of such a power storage device is usually performed by a disposal company other than the manufacturer, if the dismantling work procedure is complicated and difficult to avoid a short circuit accident or the like, the workability of the dismantling work is easy. There is a problem that is reduced.
  • the power storage device can prevent a short-circuit accident from occurring between the total voltage positive terminal or the total voltage negative terminal and the intermediate potential terminal by attaching a cover to the intermediate potential terminal.
  • a cover to the intermediate potential terminal.
  • An object of an embodiment of the present invention is to provide a construction machine capable of improving workability when disassembling a power storage device.
  • a self-propelled vehicle body to which a working device is attached, a hydraulic pump mounted on the vehicle body to drive the working device, an electric motor for driving the hydraulic pump, and a supply to the electric motor.
  • the power storage device has a storage device for storing the electric power to be generated, and the power storage device has a housing mounted on the vehicle body and an assembled battery composed of a plurality of batteries connected in series, and the battery is stored in the housing. It has a block portion, a conductive circuit provided with a connector portion connected to the electric motor and connected to the assembled battery, and a relay provided in the conductive circuit to connect or cut off between the assembled battery and the connector portion. It is applied to a construction machine provided with a circuit block unit housed in the housing and a breaking device for cutting off the series connection between the batteries constituting the assembled battery.
  • a feature of one embodiment of the present invention is that the power storage device excludes the intermediate connecting member that connects the blocking device and the assembled battery, and the connector portion in a state where the intermediate connecting member is exposed to the outside.
  • An insulating cover that covers the conductive circuit is further provided, and the intermediate connecting member prevents the insulating cover from coming off from the housing in a state where the breaking device and the assembled battery are connected to each other. is there.
  • the insulating cover cannot be removed from the housing unless the intermediate connecting member is removed to cut off the connection between the breaking device and the assembled battery. Therefore, by removing the intermediate connecting member to cut off the connection between the breaking device and the assembled battery, it is possible to avoid a short-circuit accident or the like occurring in the housing, and workability when disassembling the power storage device is possible. Can be enhanced.
  • FIG. 6 It is an external view which shows the hybrid type hydraulic excavator by 1st Embodiment. It is an exploded perspective view which shows the power storage device. It is an exploded perspective view which shows the circuit cover and the total voltage bus bar in FIG. It is an exploded perspective view which shows the total voltage terminal cover and an intermediate bus bar in FIG. It is a circuit diagram which shows schematic the electric circuit of a power storage device. It is a top view of the circuit housing part of a power storage device with the lid removed. It is a top view of the same position as FIG. 6 which shows the state which the total voltage terminal cover was removed from the circuit housing part.
  • the traveling directions of the hydraulic excavator are defined as the front and rear directions, and the directions orthogonal to the traveling direction of the hydraulic excavator are defined as the left and right directions.
  • the hybrid type hydraulic excavator 1 (hereinafter referred to as the hydraulic excavator 1) has a power source in which the engine 10 and the assist generator / motor 12 described later are used in combination.
  • the hydraulic excavator 1 includes a crawler-type lower traveling body 2 capable of self-propelling in the front and rear directions, an upper rotating body 4 mounted on the lower traveling body 2 so as to be able to swivel via a swivel device 3, and an upper swivel body. It is configured to include a working device 5 provided on the front side of the body 4.
  • the lower traveling body 2 and the upper turning body 4 constitute a vehicle body of the hydraulic excavator 1.
  • the hydraulic excavator 1 travels on the work site by the lower traveling body 2, and excavates earth and sand by moving the work device 5 up and down while turning the upper rotating body 4.
  • the upper swivel body 4 is provided on the lower traveling body 2 so as to be swivelable, and is provided with a swivel frame 6, a counter weight 7, a cab 8, a building cover 9, an engine 10, a hydraulic pump 11, an assist generator / motor 12, and a swivel, which will be described later. It includes a hydraulic motor 14, a turning power generator / motor 15, an inverter unit 17, and a power storage device 19.
  • the swivel frame 6 constitutes the base of the upper swivel body 4.
  • the swivel frame 6 includes a center frame (not shown) supported on the lower traveling body 2 via the swivel device 3 and left and right side frames 6A (only on the left side) arranged on the left and right sides of the center frame. It is configured to include (shown).
  • the base end of the working device 5 is rotatably attached to the front side of the swivel frame 6.
  • a counterweight 7 is provided at the rear end of the swivel frame 6.
  • the counterweight 7 is formed as a heavy object that balances the weight with the working device 5.
  • the cab 8 is provided on the left front side of the swivel frame 6.
  • the cab 8 defines a driver's cab on which the operator boarded.
  • a driver's seat Inside the cab 8, a driver's seat, various operating lever devices, and the like (none of which are shown) are arranged.
  • the building cover 9 is located between the cab 8 and the counterweight 7 and is provided on the swivel frame 6.
  • an engine 10 Inside the building cover 9, an engine 10, a hydraulic pump 11, an assist generator / motor 12, a swivel hydraulic motor 14, a swivel generator / motor 15, an inverter unit 17, a power storage device 19, and the like are housed.
  • the engine 10 is located on the front side of the counterweight 7 and mounted on the rear side of the turning frame 6.
  • the engine 10 drives the hydraulic pump 11.
  • the hydraulic pump 11 is connected to the engine 10 and driven by the engine 10 to the traveling hydraulic motor (not shown) of the lower traveling body 2, the turning hydraulic motor 14 of the turning device 3, and the working device 5.
  • the hydraulic oil for operation is supplied to a plurality of hydraulic actuators such as hydraulic cylinders provided.
  • the assist generator / motor 12 is connected to the engine 10 and the hydraulic pump 11.
  • the assist generator / motor 12 is connected to the output shaft of the engine 10 and the input shaft of the hydraulic pump 11 to perform a generator operation and a motor operation. That is, the assist power generation / motor 12 generates electricity by being driven by the engine 10, and stores this power in the power storage device 19.
  • the assist generator / motor 12 assists the engine 10 to drive the hydraulic pump 11 by supplying electric power from the power storage device 19.
  • the assist generator / motor 12 is electrically connected to the inverter unit 17 via a cable 13.
  • the swivel hydraulic motor 14 is provided between the lower traveling body 2 and the upper swivel body 4.
  • the swivel hydraulic motor 14 constitutes a drive source for the swivel device 3, and by supplying pressure oil from the hydraulic pump 11, the upper swivel body 4 is swiveled with respect to the lower traveling body 2.
  • the turning power generator / motor 15 is provided on the turning hydraulic motor 14.
  • the turning power generation / motor 15 assists the rotation of the turning hydraulic motor 14 by supplying electric power from the power storage device 19.
  • the turning power generation / motor 15 generates electricity by the regenerative energy generated when the turning operation of the upper turning body 4 is decelerated, and stores this power in the power storage device 19.
  • the turning power generator / motor 15 is electrically connected to the inverter unit 17 via a cable 16.
  • the inverter unit 17 is provided between the assist power generation / motor 12 and the turning power generation / motor 15 and the power storage device 19.
  • the inverter unit 17 is electrically connected to the power storage device 19 via the cable 18.
  • the inverter unit 17 has an assist inverter for controlling the operation of the assist power generation / motor 12 and a swing inverter for controlling the operation of the turning power generation / motor 15.
  • the assist inverter of the inverter unit 17 controls the operation of the assist generator / motor 12 based on a control signal from a controller (not shown).
  • the turning inverter of the inverter unit 17 controls the operation of the turning power generator / motor 15 based on the control signal from the controller.
  • the power storage device 19 is mounted on the swivel frame 6 and is housed in the building cover 9 together with the engine 10 and the like.
  • the power storage device 19 stores the power generated by the assist power generation / motor 12 and the turning power generation / motor 15, and supplies the stored power to the assist power generation / motor 12 and the turning power generation / motor 15.
  • the power storage device 19 includes a housing 20, a battery block 25, a circuit block 31, a service plug 40, total voltage bus bars 42, 43, intermediate bus bars 45, 46, and an insulating cover 47, which will be described later. It is composed of.
  • the housing 20 constitutes the outer shell of the power storage device 19.
  • the housing 20 is formed in a box shape having two upper and lower stages extending in the front and rear directions, and a battery block portion 25, a circuit block portion 31, and the like are housed therein.
  • the housing 20 includes a battery housing portion 21, a circuit housing portion 23 arranged on the upper side of the battery housing portion 21, and a lid arranged on the upper side of the circuit housing portion 23. It is composed of 24.
  • the battery housing 21 is formed in the shape of a bottomed rectangular parallelepiped box with an open upper end, and the assembled battery 26 described later is stored inside the box. That is, the battery housing portion 21 includes a rectangular bottom plate 21A, a front plate 21B rising from the front end of the bottom plate 21A, a rear plate 21C rising from the rear end of the bottom plate 21A, and a left side plate rising from the left end of the bottom plate 21A. It is formed as a box body surrounded by 21D and a right side plate 21E rising from the right end of the bottom plate 21A, and the upper end thereof is an opening end 21F.
  • a rectangular frame-shaped mounting flange 21G is provided at the upper end of the battery housing portion 21, and a plurality of bolt holes (female screw holes) 21H are formed in the mounting flange 21G.
  • a plurality of anti-vibration mounts 22 are provided on the lower surface of the bottom plate 21A, and the battery housing portion 21 is mounted on the swivel frame 6 via the anti-vibration mount 22.
  • the circuit housing portion 23 is provided on the upper side of the battery housing portion 21.
  • the circuit housing portion 23 is formed in a bottomed box shape in which the lower end closes the open end 21F of the battery housing portion 21 and the upper end is open, and the circuit block portion 31 is housed therein. That is, the circuit housing portion 23 has a rectangular bottom plate 23A that closes the opening end 21F of the battery housing portion 21, a front plate 23B that rises from the front side of the bottom plate 23A, and a rear end plate 23A that rises from the rear end side.
  • a plate 23C It is surrounded by a plate 23C, a left side plate 23D rising from the left end side of the bottom plate 23A, and a right side plate 23E rising from the right end side of the bottom plate 23A, and is formed as a box body having an open end 23F at the upper end.
  • a plurality of bolt insertion holes are formed in the bottom plate 23A at positions corresponding to the plurality of bolt holes 21H formed in the mounting flange 21G of the battery housing portion 21. Therefore, the circuit housing portion 23 is mounted on the battery housing portion 21 by screwing the bolt 23G inserted into the bolt insertion hole of the bottom plate 23A into the bolt hole 21H of the battery housing portion 21. As a result, the inside of the battery housing portion 21 is sealed by the bottom plate 23A of the circuit housing portion 23.
  • a plurality of bolt holes (female screw holes) 23H are formed at the opening end 23F of the circuit housing portion 23.
  • the front plate 23B of the circuit housing portion 23 is provided with a first connector portion 33 and a second connector portion 34, which will be described later, adjacent to each other in the left and right directions.
  • a concave portion 23J recessed from the left side plate 23D toward the right side plate 23E is provided.
  • a service plug 40 which will be described later, is attached to the recessed portion 23J.
  • the lid 24 is provided on the upper side of the circuit housing portion 23.
  • the lid 24 is composed of a plate covering the opening end 23F of the circuit housing portion 23, and the peripheral portion of the lid 24 corresponds to a plurality of bolt holes 23H formed in the opening end 23F of the circuit housing portion 23.
  • a plurality of bolt insertion holes are formed at the positions where the bolts are inserted. Therefore, the lid 24 is mounted on the circuit housing 23 by screwing the bolt 24A inserted into the bolt insertion hole of the lid 24 into the bolt hole 23H of the circuit housing 23.
  • the open end 23F of the circuit housing portion 23 is closed by the lid body 24, and the inside of the circuit housing portion 23 is sealed.
  • the battery block portion 25 is stored in the battery housing portion 21 of the housing 20.
  • the battery block unit 25 has an assembled battery 26 in which a plurality of (for example, eight) batteries 26A made of, for example, a lithium ion battery are electrically connected in series (see FIG. 5).
  • the battery 26A constituting the assembled battery 26 is not limited to the lithium ion battery, and other batteries such as a nickel hydrogen battery may be used.
  • the assembled battery 26 in which a plurality of batteries 26A are connected in series is provided with a total voltage positive terminal 27 having the highest potential and a total voltage negative terminal 28 having the lowest potential. .. Further, the assembled battery 26 is provided with an intermediate positive terminal 29 and an intermediate negative terminal 30 which have a potential (intermediate potential) of half (for example, four) of the plurality of batteries 26A.
  • the circuit block unit 31 is housed in the circuit housing unit 23 of the housing 20, and includes a conductive circuit 32 and a service plug circuit 41 described later.
  • the conductive circuit 32 has a first connector portion 33, a second connector portion 34, a connecting line 35, and a connecting line 36.
  • the assist generator / motor 12 is connected to the first connector portion 33 via a cable (not shown).
  • the second connector portion 34 is connected to the turning power generator / motor 15 via a cable (not shown).
  • the connection line 35 connects the positive terminals of the first and second connector portions 33 and 34 and the total voltage positive terminal 27 of the assembled battery 26 via the total voltage bus bar 42 described later.
  • the connection line 36 connects the negative terminals of the first and second connector portions 33 and 34 and the total voltage negative terminal 28 of the assembled battery 26 via the total voltage bus bar 43 described later.
  • a first relay 37 is provided in the middle of the connecting line 35 of the conductive circuit 32, and a second relay 38 is provided in the middle of the connecting line 36.
  • These first and second relays 37 and 38 connect or disconnect between the assembled battery 26 and the first and second connector portions 33 and 34. That is, the first and second relays 37 and 38 are kept in the open state when the hydraulic excavator 1 is not operating, and are normally opened after the engine key (not shown) is turned on when the hydraulic excavator 1 is operating. It constitutes a contact.
  • the connection line 35 is provided with an inrush current prevention device 39 so as to be connected in parallel to the first relay 37. The inrush current prevention device 39 prevents the inrush current when the first and second relays 37 and 38 shift from the open state to the closed state.
  • the service plug 40 as a breaking device is provided in the recessed portion 23J of the circuit housing portion 23.
  • the service plug 40 is connected to a service plug circuit 41 arranged in the circuit housing portion 23.
  • the service plug circuit 41 is connected to the intermediate positive terminal 29 and the intermediate negative terminal 30 of the assembled battery 26 via the intermediate bus bars 45 and 46 described later.
  • the service plug 40 is, for example, a disconnect switch that cuts off the series connection between a plurality of batteries 26A constituting the assembled battery 26 in order to ensure safety during disassembly work of the power storage device 19.
  • the total voltage bus bars 42 and 43 as the total voltage connection member are connected between the conductive circuit 32 and the assembled battery 26. That is, the total voltage bus bar 42 connects between the total voltage positive terminal 27 of the assembled battery 26 and the connection line 35, and the total voltage bus bar 43 connects between the total voltage negative terminal 28 of the assembled battery 26 and the connection line 36. Is connected.
  • the total voltage bus bar 42 is formed by using, for example, a strip-shaped metal plate, and has a main body portion 42A bent in an inverted J shape and a one-sided connection provided at one end of the main body portion 42A. It has a portion 42B and another side connecting portion 42C provided at the other end of the main body portion 42A. The upper end of the main body portion 42A is a bent portion 42D.
  • One side connection 42B of the total voltage bus bar 42 is connected to the total voltage plus terminal 27 of the assembled battery 26 using bolts 44A, and the other side connection 42C of the total voltage bus bar 42 is connected to the connection line 35 using bolts 44B. It is connected to the.
  • the total voltage bus bar 43 has the same shape as the total voltage bus bar 42, and includes a main body portion 43A, one side connection portion 43B, another side connection portion 43C, and a bending portion 43D.
  • One side connection 43B of the total voltage bus bar 43 is connected to the total voltage minus terminal 28 of the assembled battery 26 using bolts 44A, and the other side connection 43C of the total voltage bus bar 43 is connected to the connection line 36 using bolts 44B. It is connected to the.
  • the intermediate bus bars 45 and 46 as the intermediate connecting members are connected between the assembled battery 26 and the service plug circuit 41. That is, the intermediate bus bar 45 connects between the intermediate positive terminal 29 of the assembled battery 26 and the service plug circuit 41, and the intermediate bus bar 46 connects between the intermediate negative terminal 30 of the assembled battery 26 and the service plug circuit 41. doing.
  • the intermediate bus bar 45 is formed by using, for example, a strip-shaped metal plate, and has a main body portion 45A bent in a J shape and a one-side connecting portion 45B provided at one end of the main body portion 45A. And the other side connecting portion 45C provided at the other end of the main body portion 45A.
  • the upper end of the main body portion 45A is a bent portion 45D.
  • the one-side connection 45B of the intermediate bus bar 45 is connected to the intermediate positive terminal 29 of the assembled battery 26 using the bolt 44C, and the other connection 45C of the intermediate bus bar 45 is connected to the service plug circuit 41 using the bolt 44D. Has been done.
  • the intermediate bus bar 46 has the same shape as the intermediate bus bar 45, and includes a main body portion 46A, one side connecting portion 46B, another side connecting portion 46C, and a bent portion 46D.
  • the one-side connection 46B of the intermediate bus bar 46 is connected to the intermediate minus terminal 30 of the assembled battery 26 using the bolt 44C, and the other connection 46C of the intermediate bus bar 46 is connected to the service plug circuit 41 using the bolt 44D. Has been done.
  • the insulating cover 47 is provided in the circuit housing portion 23 of the housing 20. As shown in FIG. 6, when the lid 24 is removed from the circuit housing 23, the insulating cover 47 has the first connector 33 and the second connector with the intermediate bus bars 45 and 46 exposed to the outside. It covers the conductive circuit 32 except for the portion 34.
  • the insulating cover 47 is composed of a circuit cover 48 and a total voltage terminal cover 49, which will be described later.
  • the circuit cover 48 is detachably attached to the circuit housing portion 23 using a plurality of bolts 50.
  • the circuit cover 48 covers the conductive circuit 32 except for the total voltage bus bars 42, 43, the intermediate positive terminal 29, and the intermediate negative terminal 30 (see FIG. 7).
  • the circuit cover 48 is formed in a flat plate shape using a resin material having excellent electrical insulation such as PBT resin (polybutylene terephthalate resin). That is, the circuit cover 48 is formed in a flat plate shape having a front end edge 48A, a rear end edge 48B, a left end edge 48C, and a right end edge 48D.
  • an overhang 48E extending rearward from the trailing edge 48B is provided.
  • the distance between the left end edge 48C and the right end edge 48D of the circuit cover 48 is set to be substantially equal to the distance between the left side plate 23D and the right side plate 23E of the circuit housing portion 23.
  • the overhanging portion 48E of the circuit cover 48 is formed with an anterior horn hole 48F and a rear horn hole 48G penetrating in the upward and downward directions adjacent to each other in the front and rear directions.
  • the other side connection portion 42C of the total voltage bus bar 42 is inserted into the front square hole 48F, and the other side connection portion 43C of the total voltage bus bar 43 is inserted into the rear corner hole 48G.
  • a front hooking portion 48H is formed between the left end edge 48E1 of the overhanging portion 48E and the front square hole 48F, and a rear hooking portion 48J is formed between the left end edge 48E1 of the overhanging portion 48E and the rear corner hole 48G. Is formed.
  • the bent portion 42D of the total voltage bus bar 42 is always engaged with the front hook portion 48H of the circuit cover 48, and the bent portion 43D of the total voltage bus bar 43 is always engaged with the rear hook portion 48J of the circuit cover 48.
  • the total voltage bus bars 42 and 43 attach the circuit cover 48 to the circuit housing portion 23 in a state where the total voltage plus terminal 27 and the total voltage minus terminal 28 of the assembled battery 26 and the conductive circuit 32 are connected to each other. It has stopped coming off. Therefore, even if the bolt 50 is removed from the circuit cover 48, the circuit cover 48 cannot be removed from the circuit housing portion 23 unless the total voltage bus bars 42 and 43 are removed.
  • the total voltage terminal cover 49 constituting the insulating cover 47 together with the circuit cover 48 is detachably attached to the circuit housing portion 23 by using a plurality of bolts 50, and covers the total voltage bus bars 42 and 43 (see FIG. 6). ).
  • the total voltage terminal cover 49 is formed in a flat plate shape using a resin material having excellent electrical insulation such as PBT resin. That is, the total voltage terminal cover 49 is formed in a flat plate shape having a front end edge 49A, a rear end edge 49B, a left end edge 49C, and a right end edge 49D.
  • a pair of left and right rear square holes 49E1 and 49E2 and a pair of left and right front square holes 49F1 and 49F2 are formed at positions of the total voltage terminal cover 49 closer to the left end edge 49C.
  • a rear hooking portion 49G is formed between the rear corner hole 49E1 and the rear corner hole 49E2, and a front hooking portion 49H is formed between the front corner hole 49F1 and the front corner hole 49F2.
  • the other side connection portion 45C of the intermediate bus bar 45 is inserted into the rear corner hole 49E1 of the total voltage terminal cover 49, and the one side connection portion 45B of the intermediate bus bar 45 is inserted into the rear corner hole 49E2.
  • the bent portion 45D of the intermediate bus bar 45 straddles the rear hooking portion 49G of the total voltage terminal cover 49 from above.
  • the other side connecting portion 46C of the intermediate bus bar 46 is inserted into the front square hole 49F1 of the total voltage terminal cover 49, and the one side connecting portion 46B of the intermediate bus bar 46 is inserted into the front square hole 49F2.
  • the bent portion 46D of the intermediate bus bar 46 straddles the front hooking portion 49H of the total voltage terminal cover 49 from above.
  • the bent portion 45D of the intermediate bus bar 45 is always engaged with the rear hooking portion 49G of the total voltage terminal cover 49, and the bent portion 46D of the intermediate bus bar 46 is the front hooking portion 49H of the total voltage terminal cover 49.
  • the intermediate bus bars 45 and 46 prevent the total voltage terminal cover 49 from coming off from the circuit housing portion 23 in a state where the service plug 40 and the assembled battery 26 are connected.
  • the total voltage terminal cover 49 cannot be removed from the circuit housing portion 23 unless the intermediate bus bars 45 and 46 are removed. There is. That is, by removing the intermediate bus bar 45, the connection between the intermediate positive terminal 29 of the assembled battery 26 and the service plug circuit 41 is cut off, and by removing the intermediate bus bar 46, the intermediate negative terminal 30 of the assembled battery 26 and the service plug circuit are cut off. The total voltage terminal cover 49 cannot be removed unless the connection with the 41 is cut off.
  • the one-side connection portion 42B of the total voltage bus bar 42 is fixed to the total voltage plus terminal 27 of the assembled battery 26 using the bolt 44A, and the one-side connection portion 43B of the total voltage bus bar 43 is assembled using the bolt 44A. It is fixed to the total voltage minus terminal 28 of the battery 26.
  • the one-side connection portion 45B of the intermediate bus bar 45 is fixed to the intermediate positive terminal 29 of the assembled battery 26 using the bolt 44C, and the one-side connecting portion 46B of the intermediate bus bar 46 is fixed to the intermediate positive terminal 29 of the assembled battery 26 by using the bolt 44C. It is fixed to the intermediate minus terminal 30.
  • the battery block unit 25 and the circuit block unit 31 cannot be separated unless the total voltage bus bars 42 and 43 and the intermediate bus bars 45 and 46 are removed. That is, the total voltage bus bars 42 and 43 and the intermediate bus bars 45 and 46 are removed from the battery housing 21 in which the assembled battery 26 is stored and the circuit housing 23 in which the conductive circuit 32 and the service plug circuit 41 are stored. It is configured to be separated in the state of being separated.
  • the hydraulic excavator 1 has the power storage device 19 as described above, and the work procedure when disassembling the power storage device 19 will be described below.
  • the intermediate positive terminal 29, the intermediate negative terminal 30, the intermediate bus bars 45 and 46, and the service plug circuit 41 are intermediate potentials of the total voltage positive terminal 27 and the total voltage negative terminal 28, and these are all equipotential. Therefore, even if a tool or the like touches the intermediate positive terminal 29, the intermediate negative terminal 30, the intermediate bus bars 45, 46, and the service plug circuit 41 exposed to the outside, a short circuit accident or the like does not occur.
  • the intermediate bus bars 45 and 46 remove the intermediate bus bars 45 and 46. That is, the one side connection portion 45B of the intermediate bus bar 45 is removed from the intermediate positive terminal 29 of the assembled battery 26, the other side connection portion 45C is removed from the service plug circuit 41, and the one side connection portion 46B of the intermediate bus bar 46 is removed from the assembled battery 26. Remove from the intermediate minus terminal 30 of the above, and remove the other side connection portion 46C from the service plug circuit 41. As a result, the detachment prevention state of the total voltage terminal cover 49 by the intermediate bus bars 45 and 46 is released. Therefore, the total voltage terminal cover 49 can be removed from the circuit housing portion 23 by removing the plurality of bolts 50.
  • the body portion 23 can be separated quickly and safely, and the workability of the disassembling work of the power storage device 19 can be improved.
  • the power storage device 19 mounted on the hydraulic excavator 1 has a housing 20 mounted on the upper swing body 4 and an assembled battery 26 including a plurality of batteries 26A connected in series.
  • the battery block portion 25 housed in the housing 20 and the first and second connector portions 33 and 34 connected to electric devices such as the assist generator / motor 12 and the turning generator / motor 15 are provided, and the assembled battery 26 is provided.
  • the conductive circuit 32 connected to the conductive circuit 32, and the first and second relays 37 and 38 provided in the conductive circuit 32 to connect or disconnect the assembled battery 26 and the first and second connector portions 33 and 34. It includes a circuit block unit 31 housed in the housing 20 and a service plug 40 that cuts off the series connection between the batteries 26A constituting the assembled battery 26.
  • the power storage device 19 has the intermediate bus bars 45, 46 for connecting the service plug 40 and the assembled battery 26, and the first and second connector portions 33, 34 with the intermediate bus bars 45, 46 exposed to the outside.
  • An insulating cover 47 that covers the conductive circuit 32 excluding the above is further provided, and the intermediate bus bars 45 and 46 prevent the insulating cover 47 from coming off from the housing 20 in a state where the service plug 40 and the assembled battery 26 are connected. doing.
  • the insulating cover 47 (circuit cover 48 and total voltage terminal cover 49) is removed from the housing 20 unless the intermediate bus bars 45 and 46 are removed to disconnect the service plug 40 and the assembled battery 26. Can't. Therefore, even if the dismantling work of the power storage device 19 is not performed according to the regular work procedure and the dismantling work is performed without forgetting the operation of removing the service plug 40, the service plug can be removed by removing the intermediate bus bars 45 and 46. The connection between the 40 and the assembled battery 26 can be cut off.
  • intermediate bus bars 45 and 46 made of a strip-shaped metal plate are used as the intermediate connecting member.
  • an intermediate connecting member may be formed by using a conductive material such as a cable. This also applies to the total voltage connecting member composed of the total voltage bus bars 42 and 43.
  • the insulating cover 47 including the circuit cover 48 and the total voltage terminal cover 49 is attached to the circuit housing portion 23, and the intermediate bus bars 45 and 46 and the intermediate positive terminal 29 and the intermediate of the assembled battery 26 are intermediate.
  • the service plug circuit 41 is exposed (see FIG. 6).
  • the present invention is not limited to this, and only the intermediate bus bars 45 and 46 and the intermediate positive terminal 29 and the intermediate negative terminal 30 of the assembled battery 26 are exposed to the outside and arranged in the other circuit housing portion 23. It may be configured to cover the entire electric circuit.
  • a hybrid type hydraulic excavator 1 including an assist power generation / motor 12 and a turning power generation / motor 15 is illustrated.
  • the present invention is not limited to this, and can be applied to, for example, a hydraulic excavator provided with any one of an assist generator / motor 12 and a turning generator / motor 15.
  • the hybrid type hydraulic excavator 1 in which the engine 10 and the assist power generation / motor 12 connected to the engine 10 are used in combination has been described as an example.
  • the present invention is not limited to this, for example, an electric hydraulic excavator that does not have an engine, that is, an electric motor that drives an electric motor by using a power storage device in which electric power is stored in advance, and drives a hydraulic pump by this electric motor. It can also be applied to hydraulic excavators.

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Abstract

An electricity storage device (19) is provided with: a housing (20); a battery block part (25) having a battery pack (26); a circuit block part (31) having a conductive circuit (32) and first and second relays (37), (38); and a service plug (40) that breaks the series connection between battery cells (26A) constituting the battery pack (26). The electricity storage device (19) is further provided with: intermediate bus bars (45), (46) that connect the service plug (40) and the battery pack (26); and an insulating cover (47) that covers the conductive circuit (32) such that the intermediate bus bars (45), (46) are exposed to the outside. In the state in which the service plug (40) and the battery pack (26) are connected, the intermediate bus bars (45), (46) prevent the insulating cover (47) from coming off of the housing (20).

Description

建設機械Construction machinery
　本開示は、例えば油圧ショベル等の建設機械に関し、特に蓄電装置を備えた建設機械に関する。 The present disclosure relates to construction machines such as hydraulic excavators, and particularly to construction machines equipped with a power storage device.
　建設機械を代表する油圧ショベルは、自走可能な下部走行体と、下部走行体上に旋回可能に搭載された上部旋回体とを備え、下部走行体と上部旋回体とによって車体が構成されている。上部旋回体の前側には作業装置が俯仰動可能に設けられ、この作業装置によって掘削作業等が行われる。 A hydraulic excavator representing a construction machine is provided with a self-propelled lower traveling body and an upper turning body mounted on the lower traveling body so as to be able to turn, and the vehicle body is composed of the lower running body and the upper turning body. There is. A work device is provided on the front side of the upper swivel body so as to be able to move up and down, and excavation work and the like are performed by this work device.
　近年では、燃費の向上、ＣＯ２の排出量削減等を目的として、エンジンと、エンジンの駆動をアシストする発電・電動機との２種類の動力源を備えたハイブリッド式の油圧ショベルが知られている。このハイブリッド式の油圧ショベルには、エンジンによって回転駆動されることにより発電を行い、または、電力が供給されることにより前記エンジンの回転を補助するアシスト発電・電動機と、アシスト発電・電動機による発電電力を蓄電し、または、蓄電された電力を電動機に供給する蓄電装置が搭載されている。また、エンジンを搭載せず、充電された蓄電装置から供給される電力によって駆動される電動機を備え、この電動機によって油圧ポンプを駆動して動作するバッテリ式の油圧ショベルも知られている。 In recent years, hybrid hydraulic excavators equipped with two types of power sources, an engine and a generator / motor that assists the driving of the engine, have been known for the purpose of improving fuel efficiency and reducing CO 2 emissions. .. This hybrid hydraulic excavator has an assist power generation / electric motor that generates electricity by being rotationally driven by the engine or assists the rotation of the engine by supplying power, and an assist power generation / electric motor that assists the rotation of the engine. Is installed, or a power storage device that supplies the stored power to the electric motor is installed. There is also known a battery-powered hydraulic excavator that does not have an engine and is provided with an electric motor driven by electric power supplied from a charged power storage device, and is operated by driving a hydraulic pump by this electric motor.
　これらに用いられる蓄電装置は、通常、筐体と、直列接続された複数の電池（リチウムイオン電池等）からなり筐体内に格納された電池ブロック部と、電池ブロック部に接続される導電回路を有し筐体内に格納された回路ブロック部とを含んで構成されている。この種の蓄電装置の組立て作業、解体作業を行う場合には、短絡事故等を防止する必要がある。このため、蓄電装置には、電源として使用されないときに電気回路を遮断するリレー、電池ブロック部を構成する電池間の直列接続を中間電位で遮断するサービスプラグ等が設けられている。従って、蓄電装置の組立て作業、解体作業時にサービスプラグを取外すことにより、蓄電装置の電力を中間電位で遮断することができる。 The power storage device used for these is usually composed of a housing, a plurality of batteries (lithium ion batteries, etc.) connected in series, a battery block unit housed in the housing, and a conductive circuit connected to the battery block unit. It is configured to include a circuit block unit housed in a housing. When assembling or disassembling this type of power storage device, it is necessary to prevent short-circuit accidents and the like. For this reason, the power storage device is provided with a relay that cuts off the electric circuit when it is not used as a power source, a service plug that cuts off the series connection between the batteries constituting the battery block portion at an intermediate potential, and the like. Therefore, the power of the power storage device can be cut off at an intermediate potential by removing the service plug during the assembly work and the disassembly work of the power storage device.
　しかし、蓄電装置の組立て作業等においてサービスプラグを取外した場合でも、蓄電装置の総電圧プラス端子および総電圧マイナス端子と、中間電位の端子との間には電位差が存在する。このため、総電圧プラス端子あるいは総電圧マイナス端子と中間電位の端子との間で短絡事故が発生するのを防止するため、中間電位の端子にカバーを取付けた蓄電装置が開示されている（参考文献１）。 However, even when the service plug is removed during the assembly work of the power storage device, there is a potential difference between the total voltage plus terminal and the total voltage minus terminal of the power storage device and the intermediate potential terminal. Therefore, in order to prevent a short-circuit accident from occurring between the total voltage positive terminal or the total voltage negative terminal and the intermediate potential terminal, a power storage device in which a cover is attached to the intermediate potential terminal is disclosed (reference). Document 1).
特開２０１５－３２４０８号公報JP-A-2015-32408
　ところで、ハイブリッド式やバッテリ式の油圧ショベルに搭載される蓄電装置はサイズが大きい。このため、蓄電装置は、例えば筐体、電池ブロック部、回路ブロック部、冷却装置等に解体した状態で廃棄されることが多い。特に、海外においては、リチウムイオン電池を解体した状態で廃棄しなければならない地域もある。このような蓄電装置の解体作業は、通常、製造元ではない廃棄業者によって行われるため、解体作業の手順が、短絡事故等を避けるために複雑、難解であった場合には、解体作業の作業性が低下してしまうという問題がある。 By the way, the power storage device mounted on a hybrid or battery type hydraulic excavator is large in size. Therefore, the power storage device is often discarded in a disassembled state, for example, in a housing, a battery block unit, a circuit block unit, a cooling device, or the like. In particular, overseas, there are some areas where lithium-ion batteries must be disassembled and discarded. Since the dismantling work of such a power storage device is usually performed by a disposal company other than the manufacturer, if the dismantling work procedure is complicated and difficult to avoid a short circuit accident or the like, the workability of the dismantling work is easy. There is a problem that is reduced.
　特許文献１による蓄電装置は、中間電位の端子にカバーを取付けることにより、総電圧プラス端子あるいは総電圧マイナス端子と中間電位の端子との間で短絡事故が発生するのを防止することができる。しかし、蓄電装置の解体作業を行うときに、作業手順を間違えた場合、例えばサービスプラグを取外すのを忘れた状態で解体作業を行った場合には、総電圧プラス端子と総電圧マイナス端子との間で短絡事故等が発生する虞がある。 The power storage device according to Patent Document 1 can prevent a short-circuit accident from occurring between the total voltage positive terminal or the total voltage negative terminal and the intermediate potential terminal by attaching a cover to the intermediate potential terminal. However, if you make a mistake in the work procedure when disassembling the power storage device, for example, if you forget to remove the service plug and disassemble the device, the total voltage plus terminal and the total voltage minus terminal will be used. There is a risk of short-circuit accidents occurring between them.
　本発明の一実施形態の目的は、蓄電装置の解体作業を行うときの作業性を高めることができるようにした建設機械を提供することにある。 An object of an embodiment of the present invention is to provide a construction machine capable of improving workability when disassembling a power storage device.
　本発明の一実施形態は、作業装置が取付けられた自走可能な車体と、前記車体に搭載され、前記作業装置を駆動する油圧ポンプと、前記油圧ポンプを駆動する電動機と、前記電動機に供給する電力を蓄電する蓄電装置とを有し、前記蓄電装置は、前記車体に搭載された筐体と、直列接続された複数の電池からなる組電池を有し、前記筐体内に格納された電池ブロック部と、前記電動機に接続されるコネクタ部が設けられ前記組電池に接続された導電回路、および前記導電回路に設けられ前記組電池と前記コネクタ部との間を接続または遮断するリレーを有し、前記筐体内に格納された回路ブロック部と、前記組電池を構成する電池間の直列接続を遮断する遮断装置とを備えてなる建設機械に適用される。 In one embodiment of the present invention, a self-propelled vehicle body to which a working device is attached, a hydraulic pump mounted on the vehicle body to drive the working device, an electric motor for driving the hydraulic pump, and a supply to the electric motor. The power storage device has a storage device for storing the electric power to be generated, and the power storage device has a housing mounted on the vehicle body and an assembled battery composed of a plurality of batteries connected in series, and the battery is stored in the housing. It has a block portion, a conductive circuit provided with a connector portion connected to the electric motor and connected to the assembled battery, and a relay provided in the conductive circuit to connect or cut off between the assembled battery and the connector portion. It is applied to a construction machine provided with a circuit block unit housed in the housing and a breaking device for cutting off the series connection between the batteries constituting the assembled battery.
　本発明の一実施形態の特徴は、前記蓄電装置は、前記遮断装置と前記組電池との間を接続する中間接続部材と、前記中間接続部材を外部に露出させた状態で前記コネクタ部を除く前記導電回路を覆う絶縁カバーとをさらに備え、前記中間接続部材は、前記遮断装置と前記組電池との間を接続した状態で前記絶縁カバーを前記筐体に対して外れ止めしていることにある。 A feature of one embodiment of the present invention is that the power storage device excludes the intermediate connecting member that connects the blocking device and the assembled battery, and the connector portion in a state where the intermediate connecting member is exposed to the outside. An insulating cover that covers the conductive circuit is further provided, and the intermediate connecting member prevents the insulating cover from coming off from the housing in a state where the breaking device and the assembled battery are connected to each other. is there.
　本発明の一実施形態によれば、中間接続部材を取外し、遮断装置と組電池との接続を遮断しない限りは、絶縁カバーを筐体にから取外すことができない。従って、中間接続部材を取外して遮断装置と組電池との接続を遮断することにより、筐体内で短絡事故等が発生するのを回避することができ、蓄電装置の解体作業を行うときの作業性を高めることができる。 According to one embodiment of the present invention, the insulating cover cannot be removed from the housing unless the intermediate connecting member is removed to cut off the connection between the breaking device and the assembled battery. Therefore, by removing the intermediate connecting member to cut off the connection between the breaking device and the assembled battery, it is possible to avoid a short-circuit accident or the like occurring in the housing, and workability when disassembling the power storage device is possible. Can be enhanced.
第１の実施形態によるハイブリッド式の油圧ショベルを示す外観図である。It is an external view which shows the hybrid type hydraulic excavator by 1st Embodiment. 蓄電装置を示す分解斜視図である。It is an exploded perspective view which shows the power storage device. 図２中の回路カバーと総電圧バスバーを示す分解斜視図である。It is an exploded perspective view which shows the circuit cover and the total voltage bus bar in FIG. 図２中の総電圧端子カバーと中間バスバーを示す分解斜視図である。It is an exploded perspective view which shows the total voltage terminal cover and an intermediate bus bar in FIG. 蓄電装置の電気回路を概略的に示す回路図である。It is a circuit diagram which shows schematic the electric circuit of a power storage device. 蓄電装置の回路筐体部を蓋体を取外して上方からみた平面図である。It is a top view of the circuit housing part of a power storage device with the lid removed. 回路筐体部から総電圧端子カバーを取外した状態を示す図６と同様位置の平面図である。It is a top view of the same position as FIG. 6 which shows the state which the total voltage terminal cover was removed from the circuit housing part.
　以下、本発明の一実施形態について、ハイブリッド式の油圧ショベルに適用した場合を例に挙げ、添付図面に従って詳細に説明する。なお、実施の形態では、油圧ショベルの走行方向を前，後方向とし、油圧ショベルの走行方向と直交する方向を左，右方向として説明する。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where it is applied to a hybrid type hydraulic excavator. In the embodiment, the traveling directions of the hydraulic excavator are defined as the front and rear directions, and the directions orthogonal to the traveling direction of the hydraulic excavator are defined as the left and right directions.
　図中、ハイブリッド式の油圧ショベル１（以下、油圧ショベル１という）は、後述するエンジン１０とアシスト発電・電動機１２とを併用した動力源を有している。この油圧ショベル１は、前，後方向に自走可能なクローラ式の下部走行体２と、下部走行体２上に旋回装置３を介して旋回可能に搭載された上部旋回体４と、上部旋回体４の前側に設けられた作業装置５とを含んで構成されている。下部走行体２と上部旋回体４とは、油圧ショベル１の車体を構成している。油圧ショベル１は、下部走行体２によって作業現場を走行し、上部旋回体４を旋回させつつ作業装置５を俯仰動させることにより、土砂の掘削作業等を行う。 In the figure, the hybrid type hydraulic excavator 1 (hereinafter referred to as the hydraulic excavator 1) has a power source in which the engine 10 and the assist generator / motor 12 described later are used in combination. The hydraulic excavator 1 includes a crawler-type lower traveling body 2 capable of self-propelling in the front and rear directions, an upper rotating body 4 mounted on the lower traveling body 2 so as to be able to swivel via a swivel device 3, and an upper swivel body. It is configured to include a working device 5 provided on the front side of the body 4. The lower traveling body 2 and the upper turning body 4 constitute a vehicle body of the hydraulic excavator 1. The hydraulic excavator 1 travels on the work site by the lower traveling body 2, and excavates earth and sand by moving the work device 5 up and down while turning the upper rotating body 4.
　上部旋回体４は、下部走行体２上に旋回可能に設けられ、後述の旋回フレーム６、カウンタウエイト７、キャブ８、建屋カバー９、エンジン１０、油圧ポンプ１１、アシスト発電・電動機１２、旋回用油圧モータ１４、旋回用発電・電動機１５、インバータユニット１７、蓄電装置１９を含んで構成されている。 The upper swivel body 4 is provided on the lower traveling body 2 so as to be swivelable, and is provided with a swivel frame 6, a counter weight 7, a cab 8, a building cover 9, an engine 10, a hydraulic pump 11, an assist generator / motor 12, and a swivel, which will be described later. It includes a hydraulic motor 14, a turning power generator / motor 15, an inverter unit 17, and a power storage device 19.
　旋回フレーム６は、上部旋回体４のベースを構成している。旋回フレーム６は、旋回装置３を介して下部走行体２上に支持されたセンタフレーム（図示せず）と、センタフレームの左，右両側に配置された左，右のサイドフレーム６Ａ（左側のみ図示）とを含んで構成されている。旋回フレーム６の前部側には、作業装置５の基端が回動可能に取付けられている。一方、旋回フレーム６の後端には、カウンタウエイト７が設けられている。カウンタウエイト７は、作業装置５との重量バランスをとる重量物として形成されている。 The swivel frame 6 constitutes the base of the upper swivel body 4. The swivel frame 6 includes a center frame (not shown) supported on the lower traveling body 2 via the swivel device 3 and left and right side frames 6A (only on the left side) arranged on the left and right sides of the center frame. It is configured to include (shown). The base end of the working device 5 is rotatably attached to the front side of the swivel frame 6. On the other hand, a counterweight 7 is provided at the rear end of the swivel frame 6. The counterweight 7 is formed as a heavy object that balances the weight with the working device 5.
　キャブ８は、旋回フレーム６の左前側に設けられている。キャブ８は、オペレータが搭乗する運転室を画成している。キャブ８の内部には、運転席、各種の操作レバー装置等（いずれも図示せず）が配設されている。建屋カバー９は、キャブ８とカウンタウエイト７との間に位置して旋回フレーム６上に設けられている。建屋カバー９の内部には、エンジン１０、油圧ポンプ１１、アシスト発電・電動機１２、旋回用油圧モータ１４、旋回用発電・電動機１５、インバータユニット１７、蓄電装置１９等が収容されている。 The cab 8 is provided on the left front side of the swivel frame 6. The cab 8 defines a driver's cab on which the operator boarded. Inside the cab 8, a driver's seat, various operating lever devices, and the like (none of which are shown) are arranged. The building cover 9 is located between the cab 8 and the counterweight 7 and is provided on the swivel frame 6. Inside the building cover 9, an engine 10, a hydraulic pump 11, an assist generator / motor 12, a swivel hydraulic motor 14, a swivel generator / motor 15, an inverter unit 17, a power storage device 19, and the like are housed.
　エンジン１０は、カウンタウエイト７の前側に位置して旋回フレーム６の後部側に搭載されている。エンジン１０は、油圧ポンプ１１を駆動するものである。油圧ポンプ１１は、エンジン１０に接続され、エンジン１０によって駆動されることにより、下部走行体２の走行用油圧モータ（図示せず）、旋回装置３の旋回用油圧モータ１４、および作業装置５に設けられた複数の油圧シリンダ等の油圧アクチュエータに対し、作動用の圧油を供給する。 The engine 10 is located on the front side of the counterweight 7 and mounted on the rear side of the turning frame 6. The engine 10 drives the hydraulic pump 11. The hydraulic pump 11 is connected to the engine 10 and driven by the engine 10 to the traveling hydraulic motor (not shown) of the lower traveling body 2, the turning hydraulic motor 14 of the turning device 3, and the working device 5. The hydraulic oil for operation is supplied to a plurality of hydraulic actuators such as hydraulic cylinders provided.
　アシスト発電・電動機１２は、エンジン１０と油圧ポンプ１１とに連結されている。アシスト発電・電動機１２は、エンジン１０の出力軸と油圧ポンプ１１の入力軸とに接続され、発電機作用と電動機作用とを行うものである。即ち、アシスト発電・電動機１２は、エンジン１０によって駆動されることにより発電し、この電力を蓄電装置１９に蓄電する。一方、アシスト発電・電動機１２は、蓄電装置１９から電力が供給されることにより、エンジン１０を補助して油圧ポンプ１１を駆動する。アシスト発電・電動機１２は、ケーブル１３を介してインバータユニット１７に電気的に接続されている。 The assist generator / motor 12 is connected to the engine 10 and the hydraulic pump 11. The assist generator / motor 12 is connected to the output shaft of the engine 10 and the input shaft of the hydraulic pump 11 to perform a generator operation and a motor operation. That is, the assist power generation / motor 12 generates electricity by being driven by the engine 10, and stores this power in the power storage device 19. On the other hand, the assist generator / motor 12 assists the engine 10 to drive the hydraulic pump 11 by supplying electric power from the power storage device 19. The assist generator / motor 12 is electrically connected to the inverter unit 17 via a cable 13.
　旋回用油圧モータ１４は、下部走行体２と上部旋回体４との間に設けられている。旋回用油圧モータ１４は旋回装置３の駆動源を構成し、油圧ポンプ１１からの圧油が供給されることにより、下部走行体２に対して上部旋回体４を旋回させる。旋回用発電・電動機１５は、旋回用油圧モータ１４上に設けられている。旋回用発電・電動機１５は、蓄電装置１９から電力が供給されることにより、旋回用油圧モータ１４の回転を補助する。一方、旋回用発電・電動機１５は、上部旋回体４の旋回動作が減速するときに発生する回生エネルギにより発電し、この電力を蓄電装置１９に蓄電する。旋回用発電・電動機１５は、ケーブル１６を介してインバータユニット１７に電気的に接続されている。 The swivel hydraulic motor 14 is provided between the lower traveling body 2 and the upper swivel body 4. The swivel hydraulic motor 14 constitutes a drive source for the swivel device 3, and by supplying pressure oil from the hydraulic pump 11, the upper swivel body 4 is swiveled with respect to the lower traveling body 2. The turning power generator / motor 15 is provided on the turning hydraulic motor 14. The turning power generation / motor 15 assists the rotation of the turning hydraulic motor 14 by supplying electric power from the power storage device 19. On the other hand, the turning power generation / motor 15 generates electricity by the regenerative energy generated when the turning operation of the upper turning body 4 is decelerated, and stores this power in the power storage device 19. The turning power generator / motor 15 is electrically connected to the inverter unit 17 via a cable 16.
　インバータユニット１７は、アシスト発電・電動機１２および旋回用発電・電動機１５と蓄電装置１９との間に設けられている。インバータユニット１７は、ケーブル１８を介して蓄電装置１９に電気的に接続されている。インバータユニット１７は、アシスト発電・電動機１２の動作を制御するアシスト用インバータと、旋回用発電・電動機１５の動作を制御する旋回用インバータとを有している。インバータユニット１７のアシスト用インバータは、コントローラ（図示せず）からの制御信号に基づいてアシスト発電・電動機１２の動作を制御する。インバータユニット１７の旋回用インバータは、コントローラからの制御信号に基づいて旋回用発電・電動機１５の動作を制御する。 The inverter unit 17 is provided between the assist power generation / motor 12 and the turning power generation / motor 15 and the power storage device 19. The inverter unit 17 is electrically connected to the power storage device 19 via the cable 18. The inverter unit 17 has an assist inverter for controlling the operation of the assist power generation / motor 12 and a swing inverter for controlling the operation of the turning power generation / motor 15. The assist inverter of the inverter unit 17 controls the operation of the assist generator / motor 12 based on a control signal from a controller (not shown). The turning inverter of the inverter unit 17 controls the operation of the turning power generator / motor 15 based on the control signal from the controller.
　次に、本実施形態に用いられる蓄電装置１９について説明する。 Next, the power storage device 19 used in this embodiment will be described.
　蓄電装置１９は、旋回フレーム６上に搭載され、エンジン１０等と共に建屋カバー９内に収容されている。蓄電装置１９は、アシスト発電・電動機１２および旋回用発電・電動機１５が発電した電力を蓄電すると共に、蓄電した電力をアシスト発電・電動機１２および旋回用発電・電動機１５に供給する。図２に示すように、蓄電装置１９は、後述する筐体２０、電池ブロック部２５、回路ブロック部３１、サービスプラグ４０、総電圧バスバー４２，４３、中間バスバー４５，４６、絶縁カバー４７を含んで構成されている。 The power storage device 19 is mounted on the swivel frame 6 and is housed in the building cover 9 together with the engine 10 and the like. The power storage device 19 stores the power generated by the assist power generation / motor 12 and the turning power generation / motor 15, and supplies the stored power to the assist power generation / motor 12 and the turning power generation / motor 15. As shown in FIG. 2, the power storage device 19 includes a housing 20, a battery block 25, a circuit block 31, a service plug 40, total voltage bus bars 42, 43, intermediate bus bars 45, 46, and an insulating cover 47, which will be described later. It is composed of.
　筐体２０は、蓄電装置１９の外殻を構成している。筐体２０は、前，後方向に延びる上，下２段の箱状に形成され、その内部には電池ブロック部２５、回路ブロック部３１等が格納されている。図２に示すように、筐体２０は、電池筐体部２１と、電池筐体部２１の上側に配置された回路筐体部２３と、回路筐体部２３の上側に配置された蓋体２４とにより構成されている。 The housing 20 constitutes the outer shell of the power storage device 19. The housing 20 is formed in a box shape having two upper and lower stages extending in the front and rear directions, and a battery block portion 25, a circuit block portion 31, and the like are housed therein. As shown in FIG. 2, the housing 20 includes a battery housing portion 21, a circuit housing portion 23 arranged on the upper side of the battery housing portion 21, and a lid arranged on the upper side of the circuit housing portion 23. It is composed of 24.
　電池筐体部２１は、上端が開口した有底な直方体の箱状に形成され、その内部には後述の組電池２６が格納されている。即ち、電池筐体部２１は、矩形状の底板２１Ａと、底板２１Ａの前端から立上る前板２１Ｂと、底板２１Ａの後端から立上る後板２１Ｃと、底板２１Ａの左端から立上る左側板２１Ｄと、底板２１Ａの右端から立上る右側板２１Ｅとにより囲まれ、上端が開口端２１Ｆとなった箱体として形成されている。電池筐体部２１の上端には、矩形の枠状をなす取付フランジ２１Ｇが設けられ、取付フランジ２１Ｇには、複数のボルト穴（雌ねじ穴）２１Ｈが形成されている。底板２１Ａの下面には複数の防振マウント２２が設けられ、電池筐体部２１は、防振マウント２２を介して旋回フレーム６上に取付けられる。 The battery housing 21 is formed in the shape of a bottomed rectangular parallelepiped box with an open upper end, and the assembled battery 26 described later is stored inside the box. That is, the battery housing portion 21 includes a rectangular bottom plate 21A, a front plate 21B rising from the front end of the bottom plate 21A, a rear plate 21C rising from the rear end of the bottom plate 21A, and a left side plate rising from the left end of the bottom plate 21A. It is formed as a box body surrounded by 21D and a right side plate 21E rising from the right end of the bottom plate 21A, and the upper end thereof is an opening end 21F. A rectangular frame-shaped mounting flange 21G is provided at the upper end of the battery housing portion 21, and a plurality of bolt holes (female screw holes) 21H are formed in the mounting flange 21G. A plurality of anti-vibration mounts 22 are provided on the lower surface of the bottom plate 21A, and the battery housing portion 21 is mounted on the swivel frame 6 via the anti-vibration mount 22.
　回路筐体部２３は、電池筐体部２１の上側に設けられている。回路筐体部２３は、下端が電池筐体部２１の開口端２１Ｆを閉塞すると共に上端が開口した有底な箱状に形成され、その内部には回路ブロック部３１が格納されている。即ち、回路筐体部２３は、電池筐体部２１の開口端２１Ｆを閉塞する矩形状の底板２３Ａと、底板２３Ａの前側から立上る前板２３Ｂと、底板２３Ａの後端側から立上る後板２３Ｃと、底板２３Ａの左端側から立上る左側板２３Ｄと、底板２３Ａの右端側から立上る右側板２３Ｅとにより囲まれ、上端が開口端２３Ｆとなった箱体として形成されている。 The circuit housing portion 23 is provided on the upper side of the battery housing portion 21. The circuit housing portion 23 is formed in a bottomed box shape in which the lower end closes the open end 21F of the battery housing portion 21 and the upper end is open, and the circuit block portion 31 is housed therein. That is, the circuit housing portion 23 has a rectangular bottom plate 23A that closes the opening end 21F of the battery housing portion 21, a front plate 23B that rises from the front side of the bottom plate 23A, and a rear end plate 23A that rises from the rear end side. It is surrounded by a plate 23C, a left side plate 23D rising from the left end side of the bottom plate 23A, and a right side plate 23E rising from the right end side of the bottom plate 23A, and is formed as a box body having an open end 23F at the upper end.
　底板２３Ａには、電池筐体部２１の取付フランジ２１Ｇに形成された複数のボルト穴２１Ｈに対応する位置に、複数のボルト挿通孔が形成されている。従って、底板２３Ａのボルト挿通孔に挿通されたボルト２３Ｇが、電池筐体部２１のボルト穴２１Ｈに螺着されることにより、回路筐体部２３は、電池筐体部２１上に取付けられる。これにより、電池筐体部２１の内部は、回路筐体部２３の底板２３Ａによって密閉される。 A plurality of bolt insertion holes are formed in the bottom plate 23A at positions corresponding to the plurality of bolt holes 21H formed in the mounting flange 21G of the battery housing portion 21. Therefore, the circuit housing portion 23 is mounted on the battery housing portion 21 by screwing the bolt 23G inserted into the bolt insertion hole of the bottom plate 23A into the bolt hole 21H of the battery housing portion 21. As a result, the inside of the battery housing portion 21 is sealed by the bottom plate 23A of the circuit housing portion 23.
　回路筐体部２３の開口端２３Ｆには、複数のボルト穴（雌ねじ穴）２３Ｈが形成されている。また、回路筐体部２３の前板２３Ｂには、後述する第１コネクタ部３３と第２コネクタ部３４が、左，右方向に隣接して設けられている。さらに、回路筐体部２３の後板２３Ｃと左側板２３Ｄとが交わる角部には、左側板２３Ｄから右側板２３Ｅに向けて窪んだ凹窪部２３Ｊが設けられている。この凹窪部２３Ｊには、後述するサービスプラグ４０が取付けられている。 A plurality of bolt holes (female screw holes) 23H are formed at the opening end 23F of the circuit housing portion 23. Further, the front plate 23B of the circuit housing portion 23 is provided with a first connector portion 33 and a second connector portion 34, which will be described later, adjacent to each other in the left and right directions. Further, at the corner where the rear plate 23C and the left side plate 23D of the circuit housing portion 23 intersect, a concave portion 23J recessed from the left side plate 23D toward the right side plate 23E is provided. A service plug 40, which will be described later, is attached to the recessed portion 23J.
　蓋体２４は、回路筐体部２３の上側に設けられている。蓋体２４は、回路筐体部２３の開口端２３Ｆを覆う板体からなり、蓋体２４の周縁部には、回路筐体部２３の開口端２３Ｆに形成された複数のボルト穴２３Ｈに対応する位置に、複数のボルト挿通孔が形成されている。従って、蓋体２４のボルト挿通孔に挿通されたボルト２４Ａが、回路筐体部２３のボルト穴２３Ｈに螺着されることにより、蓋体２４は、回路筐体部２３上に取付けられる。これにより、回路筐体部２３の開口端２３Ｆが蓋体２４によって閉塞され、回路筐体部２３の内部が密閉される。 The lid 24 is provided on the upper side of the circuit housing portion 23. The lid 24 is composed of a plate covering the opening end 23F of the circuit housing portion 23, and the peripheral portion of the lid 24 corresponds to a plurality of bolt holes 23H formed in the opening end 23F of the circuit housing portion 23. A plurality of bolt insertion holes are formed at the positions where the bolts are inserted. Therefore, the lid 24 is mounted on the circuit housing 23 by screwing the bolt 24A inserted into the bolt insertion hole of the lid 24 into the bolt hole 23H of the circuit housing 23. As a result, the open end 23F of the circuit housing portion 23 is closed by the lid body 24, and the inside of the circuit housing portion 23 is sealed.
　電池ブロック部２５は、筐体２０の電池筐体部２１内に格納されている。電池ブロック部２５は、例えばリチウムイオン電池からなる複数（例えば８個）の電池２６Ａが電気的に直列接続された組電池２６を有している（図５参照）。なお、組電池２６を構成する電池２６Ａは、リチウムイオン電池に限らず、例えばニッケル水素電池等の他の電池を用いてもよい。 The battery block portion 25 is stored in the battery housing portion 21 of the housing 20. The battery block unit 25 has an assembled battery 26 in which a plurality of (for example, eight) batteries 26A made of, for example, a lithium ion battery are electrically connected in series (see FIG. 5). The battery 26A constituting the assembled battery 26 is not limited to the lithium ion battery, and other batteries such as a nickel hydrogen battery may be used.
　図５に示すように、複数の電池２６Ａが直列接続された組電池２６には、最も高電位となる総電圧プラス端子２７と、最も低電位となる総電圧マイナス端子２８とが設けられている。また、組電池２６には、複数の電池２６Ａの半分（例えば４個）の電位（中間電位）となる中間プラス端子２９、および中間マイナス端子３０が設けられている。 As shown in FIG. 5, the assembled battery 26 in which a plurality of batteries 26A are connected in series is provided with a total voltage positive terminal 27 having the highest potential and a total voltage negative terminal 28 having the lowest potential. .. Further, the assembled battery 26 is provided with an intermediate positive terminal 29 and an intermediate negative terminal 30 which have a potential (intermediate potential) of half (for example, four) of the plurality of batteries 26A.
　回路ブロック部３１は、筐体２０の回路筐体部２３内に格納され、導電回路３２と、後述するサービスプラグ回路４１とを含んで構成されている。導電回路３２は、第１コネクタ部３３と、第２コネクタ部３４と、接続線３５と、接続線３６とを有している。第１コネクタ部３３は、アシスト発電・電動機１２がケーブル（図示せず）を介して接続される。第２コネクタ部３４は、旋回用発電・電動機１５がケーブル（図示せず）を介して接続される。接続線３５は、後述する総電圧バスバー４２を介して第１，第２コネクタ部３３，３４のプラス端子と組電池２６の総電圧プラス端子２７との間を接続する。接続線３６は、後述する総電圧バスバー４３を介して第１，第２コネクタ部３３，３４のマイナス端子と組電池２６の総電圧マイナス端子２８との間を接続する。 The circuit block unit 31 is housed in the circuit housing unit 23 of the housing 20, and includes a conductive circuit 32 and a service plug circuit 41 described later. The conductive circuit 32 has a first connector portion 33, a second connector portion 34, a connecting line 35, and a connecting line 36. The assist generator / motor 12 is connected to the first connector portion 33 via a cable (not shown). The second connector portion 34 is connected to the turning power generator / motor 15 via a cable (not shown). The connection line 35 connects the positive terminals of the first and second connector portions 33 and 34 and the total voltage positive terminal 27 of the assembled battery 26 via the total voltage bus bar 42 described later. The connection line 36 connects the negative terminals of the first and second connector portions 33 and 34 and the total voltage negative terminal 28 of the assembled battery 26 via the total voltage bus bar 43 described later.
　導電回路３２の接続線３５の途中には、第１リレー３７が設けられ、接続線３６の途中には、第２リレー３８が設けられている。これら第１，第２リレー３７，３８は、組電池２６と第１，第２コネクタ部３３，３４との間を接続または遮断する。即ち、第１，第２リレー３７，３８は、油圧ショベル１の非作動時には開状態を保持し、油圧ショベル１の作動時にエンジンキー（図示せず）がオンされた後に閉状態となる常開接点を構成している。また、接続線３５には、第１リレー３７に対して並列接続となるように突入電流防止装置３９が設けられている。突入電流防止装置３９は、第１，第２リレー３７，３８が開状態から閉状態に移行したときの突入電流を防止する。 A first relay 37 is provided in the middle of the connecting line 35 of the conductive circuit 32, and a second relay 38 is provided in the middle of the connecting line 36. These first and second relays 37 and 38 connect or disconnect between the assembled battery 26 and the first and second connector portions 33 and 34. That is, the first and second relays 37 and 38 are kept in the open state when the hydraulic excavator 1 is not operating, and are normally opened after the engine key (not shown) is turned on when the hydraulic excavator 1 is operating. It constitutes a contact. Further, the connection line 35 is provided with an inrush current prevention device 39 so as to be connected in parallel to the first relay 37. The inrush current prevention device 39 prevents the inrush current when the first and second relays 37 and 38 shift from the open state to the closed state.
　遮断装置としてのサービスプラグ４０は、回路筐体部２３の凹窪部２３Ｊに設けられている。サービスプラグ４０は、回路筐体部２３内に配置されたサービスプラグ回路４１に接続されている。サービスプラグ回路４１は、後述する中間バスバー４５，４６を介して組電池２６の中間プラス端子２９と中間マイナス端子３０とに接続されている。サービスプラグ４０は、例えば蓄電装置１９の解体作業時の安全性を確保するため、組電池２６を構成する複数の電池２６Ａ間の直列接続を遮断するディスコネクトスイッチとなっている。 The service plug 40 as a breaking device is provided in the recessed portion 23J of the circuit housing portion 23. The service plug 40 is connected to a service plug circuit 41 arranged in the circuit housing portion 23. The service plug circuit 41 is connected to the intermediate positive terminal 29 and the intermediate negative terminal 30 of the assembled battery 26 via the intermediate bus bars 45 and 46 described later. The service plug 40 is, for example, a disconnect switch that cuts off the series connection between a plurality of batteries 26A constituting the assembled battery 26 in order to ensure safety during disassembly work of the power storage device 19.
　総電圧接続部材としての総電圧バスバー４２，４３は、導電回路３２と組電池２６との間を接続している。即ち、総電圧バスバー４２は、組電池２６の総電圧プラス端子２７と接続線３５との間を接続し、総電圧バスバー４３は、組電池２６の総電圧マイナス端子２８と接続線３６との間を接続している。 The total voltage bus bars 42 and 43 as the total voltage connection member are connected between the conductive circuit 32 and the assembled battery 26. That is, the total voltage bus bar 42 connects between the total voltage positive terminal 27 of the assembled battery 26 and the connection line 35, and the total voltage bus bar 43 connects between the total voltage negative terminal 28 of the assembled battery 26 and the connection line 36. Is connected.
　図３に示すように、総電圧バスバー４２は、例えば帯板状の金属板を用いて形成され、逆Ｊ字状に屈曲した本体部４２Ａと、本体部４２Ａの一端に設けられた一側接続部４２Ｂと、本体部４２Ａの他端に設けられた他側接続部４２Ｃとを有している。本体部４２Ａの上端は屈曲部４２Ｄとなっている。総電圧バスバー４２の一側接続部４２Ｂは、ボルト４４Ａを用いて組電池２６の総電圧プラス端子２７に接続され、総電圧バスバー４２の他側接続部４２Ｃは、ボルト４４Ｂを用いて接続線３５に接続されている。 As shown in FIG. 3, the total voltage bus bar 42 is formed by using, for example, a strip-shaped metal plate, and has a main body portion 42A bent in an inverted J shape and a one-sided connection provided at one end of the main body portion 42A. It has a portion 42B and another side connecting portion 42C provided at the other end of the main body portion 42A. The upper end of the main body portion 42A is a bent portion 42D. One side connection 42B of the total voltage bus bar 42 is connected to the total voltage plus terminal 27 of the assembled battery 26 using bolts 44A, and the other side connection 42C of the total voltage bus bar 42 is connected to the connection line 35 using bolts 44B. It is connected to the.
　総電圧バスバー４３は、総電圧バスバー４２と同一形状を有し、本体部４３Ａと、一側接続部４３Ｂと、他側接続部４３Ｃと、屈曲部４３Ｄからなっている。総電圧バスバー４３の一側接続部４３Ｂは、ボルト４４Ａを用いて組電池２６の総電圧マイナス端子２８に接続され、総電圧バスバー４３の他側接続部４３Ｃは、ボルト４４Ｂを用いて接続線３６に接続されている。 The total voltage bus bar 43 has the same shape as the total voltage bus bar 42, and includes a main body portion 43A, one side connection portion 43B, another side connection portion 43C, and a bending portion 43D. One side connection 43B of the total voltage bus bar 43 is connected to the total voltage minus terminal 28 of the assembled battery 26 using bolts 44A, and the other side connection 43C of the total voltage bus bar 43 is connected to the connection line 36 using bolts 44B. It is connected to the.
　中間接続部材としての中間バスバー４５，４６は、組電池２６とサービスプラグ回路４１との間を接続している。即ち、中間バスバー４５は、組電池２６の中間プラス端子２９とサービスプラグ回路４１との間を接続し、中間バスバー４６は、組電池２６の中間マイナス端子３０とサービスプラグ回路４１との間を接続している。 The intermediate bus bars 45 and 46 as the intermediate connecting members are connected between the assembled battery 26 and the service plug circuit 41. That is, the intermediate bus bar 45 connects between the intermediate positive terminal 29 of the assembled battery 26 and the service plug circuit 41, and the intermediate bus bar 46 connects between the intermediate negative terminal 30 of the assembled battery 26 and the service plug circuit 41. doing.
　図４に示すように、中間バスバー４５は、例えば帯板状の金属板を用いて形成され、Ｊ字状に屈曲した本体部４５Ａと、本体部４５Ａの一端に設けられた一側接続部４５Ｂと、本体部４５Ａの他端に設けられた他側接続部４５Ｃとを有している。本体部４５Ａの上端は屈曲部４５Ｄとなっている。中間バスバー４５の一側接続部４５Ｂは、ボルト４４Ｃを用いて組電池２６の中間プラス端子２９に接続され、中間バスバー４５の他側接続部４５Ｃは、ボルト４４Ｄを用いてサービスプラグ回路４１に接続されている。 As shown in FIG. 4, the intermediate bus bar 45 is formed by using, for example, a strip-shaped metal plate, and has a main body portion 45A bent in a J shape and a one-side connecting portion 45B provided at one end of the main body portion 45A. And the other side connecting portion 45C provided at the other end of the main body portion 45A. The upper end of the main body portion 45A is a bent portion 45D. The one-side connection 45B of the intermediate bus bar 45 is connected to the intermediate positive terminal 29 of the assembled battery 26 using the bolt 44C, and the other connection 45C of the intermediate bus bar 45 is connected to the service plug circuit 41 using the bolt 44D. Has been done.
　中間バスバー４６は、中間バスバー４５と同一形状を有し、本体部４６Ａと、一側接続部４６Ｂと、他側接続部４６Ｃと、屈曲部４６Ｄからなっている。中間バスバー４６の一側接続部４６Ｂは、ボルト４４Ｃを用いて組電池２６の中間マイナス端子３０に接続され、中間バスバー４６の他側接続部４６Ｃは、ボルト４４Ｄを用いてサービスプラグ回路４１に接続されている。 The intermediate bus bar 46 has the same shape as the intermediate bus bar 45, and includes a main body portion 46A, one side connecting portion 46B, another side connecting portion 46C, and a bent portion 46D. The one-side connection 46B of the intermediate bus bar 46 is connected to the intermediate minus terminal 30 of the assembled battery 26 using the bolt 44C, and the other connection 46C of the intermediate bus bar 46 is connected to the service plug circuit 41 using the bolt 44D. Has been done.
　絶縁カバー４７は、筐体２０の回路筐体部２３内に設けられている。図６に示すように、回路筐体部２３から蓋体２４を取外したときに、絶縁カバー４７は、中間バスバー４５，４６を外部に露出させた状態で、第１コネクタ部３３および第２コネクタ部３４を除く導電回路３２を覆っている。絶縁カバー４７は、後述する回路カバー４８と総電圧端子カバー４９とにより構成されている。 The insulating cover 47 is provided in the circuit housing portion 23 of the housing 20. As shown in FIG. 6, when the lid 24 is removed from the circuit housing 23, the insulating cover 47 has the first connector 33 and the second connector with the intermediate bus bars 45 and 46 exposed to the outside. It covers the conductive circuit 32 except for the portion 34. The insulating cover 47 is composed of a circuit cover 48 and a total voltage terminal cover 49, which will be described later.
　回路カバー４８は、複数のボルト５０を用いて回路筐体部２３に着脱可能に取付けられている。回路カバー４８は、総電圧バスバー４２，４３、中間プラス端子２９および中間マイナス端子３０を除いて導電回路３２を覆っている（図７参照）。図３に示すように、回路カバー４８は、例えばＰＢＴ樹脂（ポリブチレンテレフタレート樹脂）等の電気的な絶縁性に優れた樹脂素材を用いて平板状に形成されている。即ち、回路カバー４８は、前端縁４８Ａ、後端縁４８Ｂ、左端縁４８Ｃ、右端縁４８Ｄを有する平板状に形成されている。後端縁４８Ｂと右端縁４８Ｄとが交わる角部には、後端縁４８Ｂから後方に延びる張出し部４８Ｅが設けられている。回路カバー４８の左端縁４８Ｃと右端縁４８Ｄとの間隔は、回路筐体部２３の左側板２３Ｄと右側板２３Ｅとの間隔とほぼ等しく設定されている。 The circuit cover 48 is detachably attached to the circuit housing portion 23 using a plurality of bolts 50. The circuit cover 48 covers the conductive circuit 32 except for the total voltage bus bars 42, 43, the intermediate positive terminal 29, and the intermediate negative terminal 30 (see FIG. 7). As shown in FIG. 3, the circuit cover 48 is formed in a flat plate shape using a resin material having excellent electrical insulation such as PBT resin (polybutylene terephthalate resin). That is, the circuit cover 48 is formed in a flat plate shape having a front end edge 48A, a rear end edge 48B, a left end edge 48C, and a right end edge 48D. At the corner where the trailing edge 48B and the right edge 48D intersect, an overhang 48E extending rearward from the trailing edge 48B is provided. The distance between the left end edge 48C and the right end edge 48D of the circuit cover 48 is set to be substantially equal to the distance between the left side plate 23D and the right side plate 23E of the circuit housing portion 23.
　回路カバー４８の張出し部４８Ｅには、上，下方向に貫通する前角孔４８Ｆと後角孔４８Ｇとが前，後方向に隣接して形成されている。前角孔４８Ｆには、総電圧バスバー４２の他側接続部４２Ｃが挿通され、後角孔４８Ｇには、総電圧バスバー４３の他側接続部４３Ｃが挿通される。張出し部４８Ｅの左端縁４８Ｅ１と前角孔４８Ｆとの間には、前掛止め部４８Ｈが形成され、張出し部４８Ｅの左端縁４８Ｅ１と後角孔４８Ｇとの間には、後掛止め部４８Ｊが形成されている。総電圧バスバー４２の他側接続部４２Ｃが、張出し部４８Ｅの前角孔４８Ｆに挿通されたときには、総電圧バスバー４２の屈曲部４２Ｄは、前掛止め部４８Ｈを上方から跨ぐ。これと同様に、総電圧バスバー４３の他側接続部４３Ｃが、張出し部４８Ｅの後角孔４８Ｇに挿通されたときには、総電圧バスバー４３の屈曲部４３Ｄは、後掛止め部４８Ｊを上方から跨ぐ。 The overhanging portion 48E of the circuit cover 48 is formed with an anterior horn hole 48F and a rear horn hole 48G penetrating in the upward and downward directions adjacent to each other in the front and rear directions. The other side connection portion 42C of the total voltage bus bar 42 is inserted into the front square hole 48F, and the other side connection portion 43C of the total voltage bus bar 43 is inserted into the rear corner hole 48G. A front hooking portion 48H is formed between the left end edge 48E1 of the overhanging portion 48E and the front square hole 48F, and a rear hooking portion 48J is formed between the left end edge 48E1 of the overhanging portion 48E and the rear corner hole 48G. Is formed. When the other side connecting portion 42C of the total voltage bus bar 42 is inserted into the front square hole 48F of the overhanging portion 48E, the bent portion 42D of the total voltage bus bar 42 straddles the front hooking portion 48H from above. Similarly, when the other side connecting portion 43C of the total voltage bus bar 43 is inserted into the rear corner hole 48G of the overhanging portion 48E, the bent portion 43D of the total voltage bus bar 43 straddles the rear hooking portion 48J from above. ..
　このように、総電圧バスバー４２の屈曲部４２Ｄは、回路カバー４８の前掛止め部４８Ｈに常に係合し、総電圧バスバー４３の屈曲部４３Ｄは、回路カバー４８の後掛止め部４８Ｊに常に係合している。これにより、総電圧バスバー４２，４３は、組電池２６の総電圧プラス端子２７および総電圧マイナス端子２８と導電回路３２との間を接続した状態で、回路カバー４８を回路筐体部２３に対して外れ止めしている。このため、仮に回路カバー４８からボルト５０を抜取ったとしても、総電圧バスバー４２，４３を取外さない限り、回路カバー４８を回路筐体部２３から取外すことができない構成となっている。即ち、総電圧バスバー４２を取外すことにより、組電池２６の総電圧プラス端子２７と導電回路３２の接続線３５との接続を遮断し、総電圧バスバー４３を取外すことにより、組電池２６の総電圧マイナス端子２８と導電回路３２の接続線３６との接続を遮断しない限り、回路カバー４８を取外すことができない構成となっている。 In this way, the bent portion 42D of the total voltage bus bar 42 is always engaged with the front hook portion 48H of the circuit cover 48, and the bent portion 43D of the total voltage bus bar 43 is always engaged with the rear hook portion 48J of the circuit cover 48. Engaged. As a result, the total voltage bus bars 42 and 43 attach the circuit cover 48 to the circuit housing portion 23 in a state where the total voltage plus terminal 27 and the total voltage minus terminal 28 of the assembled battery 26 and the conductive circuit 32 are connected to each other. It has stopped coming off. Therefore, even if the bolt 50 is removed from the circuit cover 48, the circuit cover 48 cannot be removed from the circuit housing portion 23 unless the total voltage bus bars 42 and 43 are removed. That is, by removing the total voltage bus bar 42, the connection between the total voltage plus terminal 27 of the assembled battery 26 and the connection line 35 of the conductive circuit 32 is cut off, and by removing the total voltage bus bar 43, the total voltage of the assembled battery 26 The circuit cover 48 cannot be removed unless the connection between the negative terminal 28 and the connection line 36 of the conductive circuit 32 is cut off.
　回路カバー４８と共に絶縁カバー４７を構成する総電圧端子カバー４９は、複数のボルト５０を用いて回路筐体部２３に着脱可能に取付けられ、総電圧バスバー４２，４３を覆っている（図６参照）。図４に示すように、総電圧端子カバー４９は、例えばＰＢＴ樹脂等の電気的な絶縁性に優れた樹脂素材を用いて平板状に形成されている。即ち、総電圧端子カバー４９は、前端縁４９Ａ、後端縁４９Ｂ、左端縁４９Ｃ、右端縁４９Ｄを有する平板状に形成されている。総電圧端子カバー４９のうち左端縁４９Ｃに寄った位置には、左，右一対の後角孔４９Ｅ１，４９Ｅ２と、左，右一対の前角孔４９Ｆ１，４９Ｆ２とが形成されている。後角孔４９Ｅ１と後角孔４９Ｅ２との間には、後掛止め部４９Ｇが形成され、前角孔４９Ｆ１と前角孔４９Ｆ２との間には、前掛止め部４９Ｈが形成されている。 The total voltage terminal cover 49 constituting the insulating cover 47 together with the circuit cover 48 is detachably attached to the circuit housing portion 23 by using a plurality of bolts 50, and covers the total voltage bus bars 42 and 43 (see FIG. 6). ). As shown in FIG. 4, the total voltage terminal cover 49 is formed in a flat plate shape using a resin material having excellent electrical insulation such as PBT resin. That is, the total voltage terminal cover 49 is formed in a flat plate shape having a front end edge 49A, a rear end edge 49B, a left end edge 49C, and a right end edge 49D. A pair of left and right rear square holes 49E1 and 49E2 and a pair of left and right front square holes 49F1 and 49F2 are formed at positions of the total voltage terminal cover 49 closer to the left end edge 49C. A rear hooking portion 49G is formed between the rear corner hole 49E1 and the rear corner hole 49E2, and a front hooking portion 49H is formed between the front corner hole 49F1 and the front corner hole 49F2.
　総電圧端子カバー４９の後角孔４９Ｅ１には、中間バスバー４５の他側接続部４５Ｃが挿通され、後角孔４９Ｅ２には、中間バスバー４５の一側接続部４５Ｂが挿通される。この状態で、中間バスバー４５の屈曲部４５Ｄは、総電圧端子カバー４９の後掛止め部４９Ｇを上方から跨ぐ。これと同様に、総電圧端子カバー４９の前角孔４９Ｆ１には、中間バスバー４６の他側接続部４６Ｃが挿通され、前角孔４９Ｆ２には、中間バスバー４６の一側接続部４６Ｂが挿通される。この状態で、中間バスバー４６の屈曲部４６Ｄは、総電圧端子カバー４９の前掛止め部４９Ｈを上方から跨ぐ。 The other side connection portion 45C of the intermediate bus bar 45 is inserted into the rear corner hole 49E1 of the total voltage terminal cover 49, and the one side connection portion 45B of the intermediate bus bar 45 is inserted into the rear corner hole 49E2. In this state, the bent portion 45D of the intermediate bus bar 45 straddles the rear hooking portion 49G of the total voltage terminal cover 49 from above. Similarly, the other side connecting portion 46C of the intermediate bus bar 46 is inserted into the front square hole 49F1 of the total voltage terminal cover 49, and the one side connecting portion 46B of the intermediate bus bar 46 is inserted into the front square hole 49F2. To. In this state, the bent portion 46D of the intermediate bus bar 46 straddles the front hooking portion 49H of the total voltage terminal cover 49 from above.
　このように、中間バスバー４５の屈曲部４５Ｄは、総電圧端子カバー４９の後掛止め部４９Ｇに常に係合し、中間バスバー４６の屈曲部４６Ｄは、総電圧端子カバー４９の前掛止め部４９Ｈに常に係合している。これにより、中間バスバー４５，４６は、サービスプラグ４０と組電池２６との間を接続した状態で、総電圧端子カバー４９を回路筐体部２３に対して外れ止めしている。 In this way, the bent portion 45D of the intermediate bus bar 45 is always engaged with the rear hooking portion 49G of the total voltage terminal cover 49, and the bent portion 46D of the intermediate bus bar 46 is the front hooking portion 49H of the total voltage terminal cover 49. Always engaged with. As a result, the intermediate bus bars 45 and 46 prevent the total voltage terminal cover 49 from coming off from the circuit housing portion 23 in a state where the service plug 40 and the assembled battery 26 are connected.
　このため、仮に総電圧端子カバー４９からボルト５０を抜取ったとしても、中間バスバー４５，４６を取外さない限り、総電圧端子カバー４９を回路筐体部２３から取外すことができない構成となっている。即ち、中間バスバー４５を取外すことにより、組電池２６の中間プラス端子２９とサービスプラグ回路４１との接続を遮断し、中間バスバー４６を取外すことにより、組電池２６の中間マイナス端子３０とサービスプラグ回路４１との接続を遮断しない限り、総電圧端子カバー４９を取外すことができない構成となっている。 Therefore, even if the bolt 50 is removed from the total voltage terminal cover 49, the total voltage terminal cover 49 cannot be removed from the circuit housing portion 23 unless the intermediate bus bars 45 and 46 are removed. There is. That is, by removing the intermediate bus bar 45, the connection between the intermediate positive terminal 29 of the assembled battery 26 and the service plug circuit 41 is cut off, and by removing the intermediate bus bar 46, the intermediate negative terminal 30 of the assembled battery 26 and the service plug circuit are cut off. The total voltage terminal cover 49 cannot be removed unless the connection with the 41 is cut off.
　しかも、総電圧バスバー４２の一側接続部４２Ｂは、ボルト４４Ａを用いて組電池２６の総電圧プラス端子２７に固定され、総電圧バスバー４３の一側接続部４３Ｂは、ボルト４４Ａを用いて組電池２６の総電圧マイナス端子２８に固定されている。さらに、中間バスバー４５の一側接続部４５Ｂは、ボルト４４Ｃを用いて組電池２６の中間プラス端子２９に固定され、中間バスバー４６の一側接続部４６Ｂは、ボルト４４Ｃを用いて組電池２６の中間マイナス端子３０に固定されている。 Moreover, the one-side connection portion 42B of the total voltage bus bar 42 is fixed to the total voltage plus terminal 27 of the assembled battery 26 using the bolt 44A, and the one-side connection portion 43B of the total voltage bus bar 43 is assembled using the bolt 44A. It is fixed to the total voltage minus terminal 28 of the battery 26. Further, the one-side connection portion 45B of the intermediate bus bar 45 is fixed to the intermediate positive terminal 29 of the assembled battery 26 using the bolt 44C, and the one-side connecting portion 46B of the intermediate bus bar 46 is fixed to the intermediate positive terminal 29 of the assembled battery 26 by using the bolt 44C. It is fixed to the intermediate minus terminal 30.
　このため、電池ブロック部２５と回路ブロック部３１とは、総電圧バスバー４２，４３および中間バスバー４５，４６を取外さない限り分離することができない構成となっている。即ち、組電池２６が格納された電池筐体部２１と、導電回路３２およびサービスプラグ回路４１が格納された回路筐体部２３とは、総電圧バスバー４２，４３および中間バスバー４５，４６を取外した状態で分離される構成となっている。 Therefore, the battery block unit 25 and the circuit block unit 31 cannot be separated unless the total voltage bus bars 42 and 43 and the intermediate bus bars 45 and 46 are removed. That is, the total voltage bus bars 42 and 43 and the intermediate bus bars 45 and 46 are removed from the battery housing 21 in which the assembled battery 26 is stored and the circuit housing 23 in which the conductive circuit 32 and the service plug circuit 41 are stored. It is configured to be separated in the state of being separated.
　本実施の形態による油圧ショベル１は、上述の如き蓄電装置１９を有するもので、以下、蓄電装置１９を解体する場合の作業手順について説明する。 The hydraulic excavator 1 according to the present embodiment has the power storage device 19 as described above, and the work procedure when disassembling the power storage device 19 will be described below.
　蓄電装置１９を解体する場合には、回路筐体部２３から複数のボルト２４Ａを抜取り、蓋体２４を取外す。蓋体２４が取外された状態では、図６に示すように、回路筐体部２３内に格納されたサービスプラグ回路４１と、中間バスバー４５，４６と、組電池２６の中間プラス端子２９および中間マイナス端子３０が外部に露出している。一方、導電回路３２は、回路カバー４８によって覆われ、総電圧バスバー４２，４３は、総電圧端子カバー４９によって覆われている。 When disassembling the power storage device 19, a plurality of bolts 24A are removed from the circuit housing portion 23, and the lid body 24 is removed. In the state where the lid 24 is removed, as shown in FIG. 6, the service plug circuit 41 housed in the circuit housing portion 23, the intermediate bus bars 45 and 46, the intermediate positive terminal 29 of the assembled battery 26, and The intermediate negative terminal 30 is exposed to the outside. On the other hand, the conductive circuit 32 is covered by the circuit cover 48, and the total voltage bus bars 42 and 43 are covered by the total voltage terminal cover 49.
　この場合、中間プラス端子２９、中間マイナス端子３０、中間バスバー４５，４６、サービスプラグ回路４１は、総電圧プラス端子２７と総電圧マイナス端子２８の中間電位であり、これらは全て等電位である。このため、工具等が外部に露出した中間プラス端子２９、中間マイナス端子３０、中間バスバー４５，４６、サービスプラグ回路４１に触れたとしても、短絡事故等が発生することはない。 In this case, the intermediate positive terminal 29, the intermediate negative terminal 30, the intermediate bus bars 45 and 46, and the service plug circuit 41 are intermediate potentials of the total voltage positive terminal 27 and the total voltage negative terminal 28, and these are all equipotential. Therefore, even if a tool or the like touches the intermediate positive terminal 29, the intermediate negative terminal 30, the intermediate bus bars 45, 46, and the service plug circuit 41 exposed to the outside, a short circuit accident or the like does not occur.
　次に、中間バスバー４５，４６を取外す。即ち、中間バスバー４５の一側接続部４５Ｂを組電池２６の中間プラス端子２９から取外し、他側接続部４５Ｃをサービスプラグ回路４１から取外すと共に、中間バスバー４６の一側接続部４６Ｂを組電池２６の中間マイナス端子３０から取外し、他側接続部４６Ｃをサービスプラグ回路４１から取外す。これにより、中間バスバー４５，４６による総電圧端子カバー４９の外れ止め状態が解除される。従って、複数のボルト５０を取外すことにより、回路筐体部２３から総電圧端子カバー４９を取外すことができる。 Next, remove the intermediate bus bars 45 and 46. That is, the one side connection portion 45B of the intermediate bus bar 45 is removed from the intermediate positive terminal 29 of the assembled battery 26, the other side connection portion 45C is removed from the service plug circuit 41, and the one side connection portion 46B of the intermediate bus bar 46 is removed from the assembled battery 26. Remove from the intermediate minus terminal 30 of the above, and remove the other side connection portion 46C from the service plug circuit 41. As a result, the detachment prevention state of the total voltage terminal cover 49 by the intermediate bus bars 45 and 46 is released. Therefore, the total voltage terminal cover 49 can be removed from the circuit housing portion 23 by removing the plurality of bolts 50.
　総電圧端子カバー４９が取外された状態では、図７に示すように、回路筐体部２３内に格納されたサービスプラグ回路４１と、組電池２６の中間プラス端子２９および中間マイナス端子３０と、総電圧プラス端子２７および総電圧マイナス端子２８と、総電圧バスバー４２，４３とが外部に露出している。この場合、中間バスバー４５，４６は取外されているので、仮にサービスプラグ４０を取外す操作を忘れたまま解体作業が行われ、工具等が総電圧プラス端子２７および総電圧マイナス端子２８に触れたとしても、短絡事故等の発生を回避することができる。 With the total voltage terminal cover 49 removed, as shown in FIG. 7, the service plug circuit 41 housed in the circuit housing 23, the intermediate positive terminal 29 and the intermediate negative terminal 30 of the assembled battery 26 , The total voltage plus terminal 27, the total voltage minus terminal 28, and the total voltage bus bars 42 and 43 are exposed to the outside. In this case, since the intermediate bus bars 45 and 46 have been removed, the dismantling work was performed without forgetting the operation of removing the service plug 40, and the tool or the like touched the total voltage positive terminal 27 and the total voltage negative terminal 28. Even so, it is possible to avoid the occurrence of a short circuit accident or the like.
　この状態で、総電圧バスバー４２，４３を取外す。即ち、総電圧バスバー４２の一側接続部４２Ｂを組電池２６の総電圧プラス端子２７から取外し、他側接続部４２Ｃを導電回路３２（接続線３５）から取外す。また、総電圧バスバー４３の一側接続部４３Ｂを組電池２６の総電圧マイナス端子２８から取外し、他側接続部４３Ｃを導電回路３２（接続線３６）から取外す。これにより、総電圧バスバー４２，４３による回路カバー４８の外れ止め状態が解除される。従って、複数のボルト５０を取外すことにより、回路筐体部２３から回路カバー４８を取外すことができる。 In this state, remove the total voltage bus bars 42 and 43. That is, one side connection portion 42B of the total voltage bus bar 42 is removed from the total voltage plus terminal 27 of the assembled battery 26, and the other side connection portion 42C is removed from the conductive circuit 32 (connection line 35). Further, the one-side connection portion 43B of the total voltage bus bar 43 is removed from the total voltage minus terminal 28 of the assembled battery 26, and the other side connection portion 43C is removed from the conductive circuit 32 (connection line 36). As a result, the detachment prevention state of the circuit cover 48 by the total voltage bus bars 42 and 43 is released. Therefore, the circuit cover 48 can be removed from the circuit housing portion 23 by removing the plurality of bolts 50.
　回路カバー４８が取外された状態では、回路筐体部２３内に格納された導電回路３２、サービスプラグ回路４１を含む全ての電気回路が外部に露出する。この場合、回路筐体部２３内の電気回路と電池筐体部２１内の組電池２６との接続は遮断されている。従って、工具等が回路筐体部２３内の電気回路に触れたとしても、短絡事故等が発生するのを回避することができる。 When the circuit cover 48 is removed, all the electric circuits including the conductive circuit 32 and the service plug circuit 41 housed in the circuit housing 23 are exposed to the outside. In this case, the connection between the electric circuit in the circuit housing 23 and the assembled battery 26 in the battery housing 21 is cut off. Therefore, even if a tool or the like touches the electric circuit in the circuit housing portion 23, it is possible to avoid a short circuit accident or the like.
　このようにして、中間バスバー４５，４６および総電圧バスバー４２，４３を取外すことにより、組電池２６が格納された電池筐体部２１と、導電回路３２およびサービスプラグ回路４１が格納された回路筐体部２３とを迅速かつ安全に分離することができ、蓄電装置１９の解体作業の作業性を高めることができる。 By removing the intermediate bus bars 45, 46 and the total voltage bus bars 42, 43 in this way, the battery housing 21 in which the assembled battery 26 is housed, and the circuit housing in which the conductive circuit 32 and the service plug circuit 41 are housed. The body portion 23 can be separated quickly and safely, and the workability of the disassembling work of the power storage device 19 can be improved.
　かくして、実施形態によれば、油圧ショベル１に搭載された蓄電装置１９は、上部旋回体４に搭載された筐体２０と、直列接続された複数の電池２６Ａからなる組電池２６を有し、筐体２０内に格納された電池ブロック部２５と、アシスト発電・電動機１２、旋回用発電・電動機１５等の電気機器に接続される第１，第２コネクタ部３３，３４が設けられ組電池２６に接続された導電回路３２、および導電回路３２に設けられ組電池２６と第1，第２コネクタ部３３，３４との間を接続または遮断する第１，第２リレー３７，３８を有し、筐体２０内に格納された回路ブロック部３１と、組電池２６を構成する電池２６Ａ間の直列接続を遮断するサービスプラグ４０とを備えている。 Thus, according to the embodiment, the power storage device 19 mounted on the hydraulic excavator 1 has a housing 20 mounted on the upper swing body 4 and an assembled battery 26 including a plurality of batteries 26A connected in series. The battery block portion 25 housed in the housing 20 and the first and second connector portions 33 and 34 connected to electric devices such as the assist generator / motor 12 and the turning generator / motor 15 are provided, and the assembled battery 26 is provided. The conductive circuit 32 connected to the conductive circuit 32, and the first and second relays 37 and 38 provided in the conductive circuit 32 to connect or disconnect the assembled battery 26 and the first and second connector portions 33 and 34. It includes a circuit block unit 31 housed in the housing 20 and a service plug 40 that cuts off the series connection between the batteries 26A constituting the assembled battery 26.
　そして、蓄電装置１９は、サービスプラグ４０と組電池２６との間を接続する中間バスバー４５，４６と、中間バスバー４５，４６を外部に露出させた状態で第１，第２コネクタ部３３，３４を除く導電回路３２を覆う絶縁カバー４７とをさらに備え、中間バスバー４５，４６は、サービスプラグ４０と組電池２６との間を接続した状態で、絶縁カバー４７を筐体２０に対して外れ止めしている。 Then, the power storage device 19 has the intermediate bus bars 45, 46 for connecting the service plug 40 and the assembled battery 26, and the first and second connector portions 33, 34 with the intermediate bus bars 45, 46 exposed to the outside. An insulating cover 47 that covers the conductive circuit 32 excluding the above is further provided, and the intermediate bus bars 45 and 46 prevent the insulating cover 47 from coming off from the housing 20 in a state where the service plug 40 and the assembled battery 26 are connected. doing.
　この構成によれば、中間バスバー４５，４６を取外してサービスプラグ４０と組電池２６との接続を遮断しない限りは、絶縁カバー４７（回路カバー４８および総電圧端子カバー４９）を筐体２０から取外すことができない。従って、蓄電装置１９の解体作業が、正規の作業手順に従って行われず、仮にサービスプラグ４０を取外す操作を忘れたまま解体作業が行われたとしても、中間バスバー４５，４６を取外すことにより、サービスプラグ４０と組電池２６との接続を遮断することができる。この結果、工具等が回路筐体部２３内の電気回路に触れたとしても、短絡事故等が発生するのを回避することができ、組電池２６が格納された電池筐体部２１と、導電回路３２およびサービスプラグ回路４１が格納された回路筐体部２３とを迅速かつ安全に分離することができ、蓄電装置１９の解体作業の作業性を高めることができる。 According to this configuration, the insulating cover 47 (circuit cover 48 and total voltage terminal cover 49) is removed from the housing 20 unless the intermediate bus bars 45 and 46 are removed to disconnect the service plug 40 and the assembled battery 26. Can't. Therefore, even if the dismantling work of the power storage device 19 is not performed according to the regular work procedure and the dismantling work is performed without forgetting the operation of removing the service plug 40, the service plug can be removed by removing the intermediate bus bars 45 and 46. The connection between the 40 and the assembled battery 26 can be cut off. As a result, even if a tool or the like touches the electric circuit in the circuit housing portion 23, it is possible to avoid a short-circuit accident or the like, and the battery housing portion 21 in which the assembled battery 26 is stored and the conductivity The circuit 32 and the circuit housing portion 23 in which the service plug circuit 41 is housed can be separated quickly and safely, and the workability of the disassembly work of the power storage device 19 can be improved.
　なお、実施の形態では、中間接続部材として、帯板状の金属板からなる中間バスバー４５，４６を用いた場合を例示している。しかし、本発明はこれに限らず、例えばケーブル等の導電材料を用いて中間接続部材を形成してもよい。このことは、総電圧バスバー４２，４３によって構成された総電圧接続部材についても同様である。 In the embodiment, the case where the intermediate bus bars 45 and 46 made of a strip-shaped metal plate are used as the intermediate connecting member is illustrated. However, the present invention is not limited to this, and an intermediate connecting member may be formed by using a conductive material such as a cable. This also applies to the total voltage connecting member composed of the total voltage bus bars 42 and 43.
　実施の形態では、回路カバー４８および総電圧端子カバー４９からなる絶縁カバー４７は、回路筐体部２３に取付けられた状態で、中間バスバー４５，４６、および組電池２６の中間プラス端子２９，中間マイナス端子３０の他に、サービスプラグ回路４１を露出させる構成としている（図６参照）。しかし、本発明はこれに限らず、中間バスバー４５，４６、および組電池２６の中間プラス端子２９，中間マイナス端子３０のみを外部に露出させ、それ以外の回路筐体部２３内に配置された電気回路全体を覆う構成としてもよい。 In the embodiment, the insulating cover 47 including the circuit cover 48 and the total voltage terminal cover 49 is attached to the circuit housing portion 23, and the intermediate bus bars 45 and 46 and the intermediate positive terminal 29 and the intermediate of the assembled battery 26 are intermediate. In addition to the negative terminal 30, the service plug circuit 41 is exposed (see FIG. 6). However, the present invention is not limited to this, and only the intermediate bus bars 45 and 46 and the intermediate positive terminal 29 and the intermediate negative terminal 30 of the assembled battery 26 are exposed to the outside and arranged in the other circuit housing portion 23. It may be configured to cover the entire electric circuit.
　実施の形態では、アシスト発電・電動機１２と、旋回用発電・電動機１５とを備えたハイブリッド式の油圧ショベル１を例示している。しかし、本発明はこれに限らず、例えばアシスト発電・電動機１２および旋回用発電・電動機１５のうちいずれか一方を備えた油圧ショベルにも適用することができる。 In the embodiment, a hybrid type hydraulic excavator 1 including an assist power generation / motor 12 and a turning power generation / motor 15 is illustrated. However, the present invention is not limited to this, and can be applied to, for example, a hydraulic excavator provided with any one of an assist generator / motor 12 and a turning generator / motor 15.
　実施形態では、エンジン１０と、エンジン１０に連結されたアシスト発電・電動機１２とを併用したハイブリッド式の油圧ショベル１を例に挙げて説明した。しかし、本発明はこれに限らず、例えばエンジンを搭載しない電動式の油圧ショベル、即ち、予め電力が蓄電された蓄電装置を用いて電動機を駆動し、この電動機によって油圧ポンプを駆動する電動式の油圧ショベルにも適用することができる。 In the embodiment, the hybrid type hydraulic excavator 1 in which the engine 10 and the assist power generation / motor 12 connected to the engine 10 are used in combination has been described as an example. However, the present invention is not limited to this, for example, an electric hydraulic excavator that does not have an engine, that is, an electric motor that drives an electric motor by using a power storage device in which electric power is stored in advance, and drives a hydraulic pump by this electric motor. It can also be applied to hydraulic excavators.
　１　油圧ショベル（建設機械）
　２　下部走行体（車体）
　４　上部旋回体（車体）
　５　作業装置
　１０　エンジン
　１２　アシスト発電・電動機（電動機）
　１５　旋回用発電・電動機（電動機）
　１９　蓄電装置
　２０　筐体
　２１　電池筐体部
　２３　回路筐体部
　２５　電池ブロック部
　２６　組電池
　２６Ａ　電池
　２７　総電圧プラス端子
　２８　総電圧マイナス端子
　２９　中間プラス端子
　３０　中間マイナス端子
　３１　回路ブロック部
　３２　導電回路
　３３　第１コネクタ部（コネクタ部）
　３４　第２コネクタ部（コネクタ部）
　３７　第１リレー（リレー）
　３８　第２リレー（リレー）
　４０　サービスプラグ（遮断装置）
　４２，４３　総電圧バスバー（総電圧接続部材）
　４５，４６　中間バスバー（中間接続部材）
　４７　絶縁カバー
　４８　回路カバー
　４９　総電圧端子カバー 1 Hydraulic excavator (construction machinery)
2 Lower running body (body)
4 Upper swivel body (body)
5 Work equipment 10 Engine 12 Assist power generation / motor (motor)
15 Power generation / motor for turning (motor)
19 Power storage device 20 Housing 21 Battery housing 23 Circuit housing 25 Battery block 26 group battery 26A Battery 27 Total voltage positive terminal 28 Total voltage negative terminal 29 Intermediate positive terminal 30 Intermediate negative terminal 31 Circuit block 32 Conductive circuit 33 First connector part (connector part)
34 Second connector part (connector part)
37 1st relay (relay)
38 Second relay (relay)
40 Service plug (breaker)
42,43 Total voltage bus bar (total voltage connection member)
45,46 Intermediate bus bar (intermediate connecting member)
47 Insulation cover 48 Circuit cover 49 Total voltage terminal cover

Claims (3)

  1. 　作業装置が取付けられた自走可能な車体と、
    　前記車体に搭載され、前記作業装置を駆動する油圧ポンプと、
    　前記油圧ポンプを駆動する電動機と、
    　前記電動機に供給する電力を蓄電する蓄電装置とを有し、
    　前記蓄電装置は、
    　前記車体に搭載された筐体と、
    　直列接続された複数の電池からなる組電池を有し、前記筐体内に格納された電池ブロック部と、
    　前記電動機に接続されるコネクタ部が設けられ前記組電池に接続された導電回路、および前記導電回路に設けられ前記組電池と前記コネクタ部との間を接続または遮断するリレーを有し、前記筐体内に格納された回路ブロック部と、
    　前記組電池を構成する電池間の直列接続を遮断する遮断装置とを備えてなる建設機械において、
    　前記蓄電装置は、前記遮断装置と前記組電池との間を接続する中間接続部材と、
    　前記中間接続部材を外部に露出させた状態で前記コネクタ部を除く前記導電回路を覆う絶縁カバーとをさらに備え、
    　前記中間接続部材は、前記遮断装置と前記組電池との間を接続した状態で前記絶縁カバーを前記筐体に対して外れ止めしていることを特徴とする建設機械。     A self-propelled vehicle body with a work device attached and
    A hydraulic pump mounted on the vehicle body and driving the work device,
    The electric motor that drives the hydraulic pump and
    It has a power storage device that stores the power supplied to the electric motor.
    The power storage device
    The housing mounted on the vehicle body and
    It has an assembled battery composed of a plurality of batteries connected in series, and has a battery block unit housed in the housing and a battery block unit.
    The housing includes a conductive circuit provided with a connector portion connected to the electric motor and connected to the assembled battery, and a relay provided in the conductive circuit to connect or disconnect the assembled battery and the connector portion. The circuit block part stored in the body and
    In a construction machine provided with a breaking device for breaking the series connection between the batteries constituting the assembled battery.
    The power storage device includes an intermediate connecting member that connects the shutoff device and the assembled battery.
    Further provided with an insulating cover that covers the conductive circuit excluding the connector portion in a state where the intermediate connecting member is exposed to the outside.
    The intermediate connecting member is a construction machine characterized in that the insulating cover is prevented from coming off from the housing in a state where the breaking device and the assembled battery are connected to each other.
  2. 　前記組電池は、最も高電位となる総電圧プラス端子と、最も低電位となる総電圧マイナス端子と、前記総電圧プラス端子と前記総電圧マイナス端子との中間電位となる中間プラス端子および中間マイナス端子とを有し、
    　前記遮断装置は、前記中間プラス端子と前記中間マイナス端子との間を遮断するサービスプラグによって構成され、
    　前記中間接続部材は、前記中間プラス端子および前記中間マイナス端子と前記サービスプラグとの間を接続した状態で前記絶縁カバーを前記筐体に対して外れ止めし、
    　前記電池ブロック部と前記回路ブロック部とは、前記中間接続部材を取外さない限り分離できない構成としたことを特徴とする請求項１に記載の建設機械。     The assembled battery has a total voltage positive terminal having the highest potential, a total voltage negative terminal having the lowest potential, and an intermediate positive terminal and an intermediate negative terminal having an intermediate potential between the total voltage positive terminal and the total voltage negative terminal. Has terminals and
    The blocking device is composed of a service plug that cuts off between the intermediate positive terminal and the intermediate negative terminal.
    In the intermediate connecting member, the insulating cover is prevented from coming off from the housing in a state where the intermediate positive terminal, the intermediate negative terminal, and the service plug are connected to each other.
    The construction machine according to claim 1, wherein the battery block portion and the circuit block portion cannot be separated unless the intermediate connecting member is removed.
  3. 　前記筐体は、前記電池ブロック部が格納された電池筐体部と、前記回路ブロック部が格納され前記電池筐体部に取付けられた回路筐体部とにより構成され、
    　前記電池ブロック部と前記回路ブロック部との間には、前記組電池の前記総電圧プラス端子および前記総電圧マイナス端子と前記導電回路との間を接続する総電圧接続部材が設けられ、
    　前記絶縁カバーは、前記総電圧接続部材、前記中間プラス端子および前記中間マイナス端子を除いて前記導電回路を覆う回路カバーと、前記総電圧接続部材を覆う総電圧端子カバーとにより構成され、
    　前記中間接続部材は、前記中間プラス端子および前記中間マイナス端子と前記サービスプラグとの間を接続した状態で前記総電圧端子カバーを前記回路筐体部に対して外れ止めし、
    　前記総電圧接続部材は、前記総電圧プラス端子および前記総電圧マイナス端子と前記導電回路との間を接続した状態で前記回路カバーを前記回路筐体部に対して外れ止めし、
    　前記電池筐体部と前記回路筐体部とは、前記中間接続部材と前記総電圧接続部材とを取外した状態で分離される構成としたことを特徴とする請求項２に記載の建設機械。     The housing is composed of a battery housing portion in which the battery block portion is stored and a circuit housing portion in which the circuit block portion is stored and attached to the battery housing portion.
    Between the battery block portion and the circuit block portion, a total voltage connecting member for connecting the total voltage positive terminal of the assembled battery and the total voltage negative terminal and the conductive circuit is provided.
    The insulating cover is composed of a circuit cover that covers the conductive circuit except for the total voltage connecting member, the intermediate positive terminal and the intermediate negative terminal, and a total voltage terminal cover that covers the total voltage connecting member.
    The intermediate connecting member prevents the total voltage terminal cover from coming off from the circuit housing portion in a state where the intermediate positive terminal, the intermediate negative terminal, and the service plug are connected to each other.
    The total voltage connecting member prevents the circuit cover from coming off from the circuit housing portion in a state where the total voltage positive terminal and the total voltage negative terminal are connected to the conductive circuit.
    The construction machine according to claim 2, wherein the battery housing portion and the circuit housing portion are separated from each other in a state in which the intermediate connecting member and the total voltage connecting member are removed.
PCT/JP2020/024569 2019-07-05 2020-06-23 Construction machine WO2021006031A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002012097A (en) * 2000-06-28 2002-01-15 Unisia Jecs Corp Electronic control device for vehicle
JP2005130636A (en) * 2003-10-24 2005-05-19 Yazaki Corp Circuit structure of junction block
JP2007172893A (en) * 2005-12-19 2007-07-05 Nissan Motor Co Ltd Battery module
JP2014179256A (en) * 2013-03-15 2014-09-25 Sanyo Electric Co Ltd Battery pack

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002012097A (en) * 2000-06-28 2002-01-15 Unisia Jecs Corp Electronic control device for vehicle
JP2005130636A (en) * 2003-10-24 2005-05-19 Yazaki Corp Circuit structure of junction block
JP2007172893A (en) * 2005-12-19 2007-07-05 Nissan Motor Co Ltd Battery module
JP2014179256A (en) * 2013-03-15 2014-09-25 Sanyo Electric Co Ltd Battery pack

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