JP2019106770A - Electric connection box - Google Patents

Abstract

An electrical junction box having a more suitable storage structure that satisfies the requirements for securing an insulation distance and miniaturization is provided. An electrical junction box of the present disclosure is disposed in a housing and a lower region in the housing, and receives a power supply from the battery and forms a first electrical path that distributes the power to the load device. A bus bar, an insulative substrate support base disposed so as to cover the bus bar from above in the housing, and the load device disposed on the substrate support base from a branch point of the first electric path An insulated wire that forms at least a part of a second electrical path that communicates with the second electrical path; a fuse that is connected to the second electrical path and blocks overcurrent generated in the second electrical path; and on the substrate support base A circuit board supported in a state in which the board surface is directed in the vertical direction, and the board support base holds the fuse in a recess formed on the upper surface side, and in the upper region of the fuse, Support the circuit board[Selection] Figure 10

Description

  The present disclosure relates to an electrical connection box.

  BACKGROUND Conventionally, high-voltage devices such as batteries, on-vehicle chargers, and inverters are mounted on vehicles such as electric vehicles and hybrid vehicles. In such a vehicle, electric components such as power lines (for example, bus bars) and relays for receiving power from these high voltage devices or distributing power to the high voltage devices are aggregated and configured. The electric connection box (hereinafter also referred to as "junction box") is installed.

  On the other hand, in the Japanese Patent Application No. 2017-032605, the inventors of the present application have joined a control device having a function such as a charge / discharge control unit that generates a command signal for causing the vehicle charger (charging module) to perform a charging operation. We are considering installing in the box.

  Patent Document 1 describes that a control device is mounted in a junction box. The junction box disclosed in Patent Document 1 includes a pair of bus bars that form an electrical path between a high voltage battery and a high voltage load, a semiconductor module that energizes and shuts off a pair of bus bars, and a semiconductor module. And a circuit board on which a control circuit for outputting a control signal to be controlled is mounted. The circuit board is located above the semiconductor module in the junction box via a spacer standing on the upper surface of the radiator. Are arranged in layers.

JP, 2017-118672, A

  By the way, when designing the storage structure of the electric component in the junction box, it is between the electric component (for example, bus bar) through which the high voltage current flows and the other electric component (for example, the circuit board) Securing the insulation distance is an issue.

  In this regard, a control device (that is, a circuit board) having the above-described various functions generally increases in size. Therefore, as a storage structure of the electrical components in the junction box, a design that meets the demand for downsizing of the entire junction box is required, in particular, assuring the insulation distance between the circuit board and the bus bar.

  The junction box described in Patent Document 1 is not a junction box that distributes power to a plurality of power modules, and a circuit board mounted on the junction box does not communicate with the plurality of power modules. Moreover, in patent document 1, there is no disclosure about mounting a current sensor or a fuse in an electrical connection box, and there is also no description about insulation of a high voltage power line and a control device.

  This indication is made in view of the above-mentioned problem, and it aims at providing an electric connection box which has a more suitable accommodation structure which satisfied insulation distance and a request for miniaturization.

The main present disclosure to solve the above-mentioned problems is
An electrical junction box for relaying power distribution from a battery to a plurality of load devices, comprising:
And
A bus bar disposed in a lower region in the housing and forming a first electrical path for receiving power supply from the battery and distributing it to the load device;
An insulating substrate support provided so as to cover the bus bar from above in the housing;
An insulated wire disposed on the substrate support and forming at least a portion of a second electrical path leading from the branch point of the first electrical path to the load device;
A fuse connected in the second electrical path for interrupting an overcurrent generated in the second electrical path;
A circuit board supported on the substrate support with the substrate surface oriented in the vertical direction;
Equipped with
The substrate support is an electrical connection box that holds the fuse in a recess formed on the upper surface side and supports the circuit board in the upper region of the fuse.

And in other aspects,
It is a vehicle carrying the said electrical connection box.

  According to the present disclosure, it is possible to realize an electrical connection box having a more preferable storage structure that satisfies the requirements for securing the insulation distance and downsizing.

A figure showing an example of composition of electric power system of vehicles concerning an embodiment An exploded view of each part stored in the junction box according to the embodiment An exploded view of each part stored in the junction box according to the embodiment Top view of the junction box according to the embodiment Top view of the junction box according to the embodiment Top view of the junction box according to the embodiment Top view of the junction box according to the embodiment Side cross-sectional view of the junction box according to the embodiment The enlarged view showing the support structure of the current sensor concerning this embodiment concerning an embodiment The figure explaining the arrangement configuration of the current sensor at the time of mounting the junction box concerning an embodiment in a car. The perspective view which shows the structure of the subholder in the junction box which concerns on embodiment

  Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functions will be assigned the same reference numerals and redundant description will be omitted.

[Configuration of vehicle's power system]
FIG. 1 is a diagram showing an example of a configuration of a power system of a vehicle A according to the present embodiment.

  In FIG. 1, thick lines L1 to L8 (L1-H to L8-H, L1-L to L8-L) indicate high voltage power lines. The high voltage power lines L1-H to L8-H indicate power lines on the high side, and the high voltage power lines L1-L to L8-L indicate power lines on the low side.

  In FIG. 1, dotted lines indicate signal lines communicating with the respective units. In the present embodiment, low voltage power lines for supplying control power to the respective electronic control units are also arranged in parallel with the signal lines shown by the dotted lines.

   Vehicle A is, for example, an electric car or a plug-in hybrid car, and a vehicle ECU (Electronic Control Unit) 100000, a junction box 10000, and a plurality of power modules (battery module 20000, inverter module 40000, DC / DC module 50000, charging Module 60000, electric compressor 70000, heater 80000, cooler 90000 (hereinafter collectively referred to as "power module". DC / DC module 50000, charging module 60000, electric compressor 70000, heater 80000, cooler 90000 "complementary (Generally referred to as “machine module” or “load device”) and the like.

  Junction box 10000 draws high voltage power lines drawn from each power module, high voltage power lines drawn for connection to external rapid charging facility S2, etc. into its own housing, and between multiple power modules Relay power transfer.

  In addition, junction box 10000 houses relays 41 and 42 provided between high-voltage power lines between external rapid charging equipment S2 and battery module 20000. In addition, fuses 11 to 15 provided in high voltage power lines L1-H to L5-H leading to respective auxiliary device modules 50000, 60000, 70000, 80000, and 90000 are accommodated.

  Here, the junction box 10000 according to the present embodiment includes a relay ECU (relay device) 22. The relay ECU 22 communicates with the vehicle ECU 100000 and communicates with each power module.

  The relay ECU 22 acquires a charge state and the like from the battery module 20000, and issues a charger operation command signal to the charge module 60000 to charge the battery module 20000. DC / DC command function that issues DC converter operation command signal, and quick charge command function that issues quick charge command to charge battery module 20000 from external fast charge equipment S2, operation of electric compressor 70000, heater 80000 and cooler 90000 It has a function to switch the state.

  In addition, junction box 10000 houses current sensor 300 for detecting a charging current leading to battery module 20000 or an output current output from battery module 20000. The detection result of the current sensor 300 is output to the relay ECU 22, and used, for example, for adjustment of the output current in the charging module 60000. In the high voltage power line L7-H, the current sensor 300 is disposed closer to the battery module 20000 than each branch point branched into the high voltage power lines L1-H to L6-H.

  Junction box 10000 connects BATTHV connector 1100, quick charge connector 1200, INV connector 1300, and accessory HV connector in order to connect the high voltage power line extending from each power module to the high voltage power line in its own housing. It has 1401-1405.

  In FIG. 1, high voltage power line L7 (L7-H, L7-L) receives power transmitted from battery module 20000 through BATTHV connector 1100, and auxiliary module 50000, 60000, 70000, 80000, and so forth. It is a power line (hereinafter, also referred to as “first electric path”) that distributes to 90000.

  Also, high voltage power lines L1 to L5 (L1 to H5 to L5, L1 to L5 to L5) are connected to branch points of high voltage power lines L7 to H, and auxiliary modules 50000, 60000, 70000, 80000, 90000, respectively. Power line (hereinafter, also referred to as “second electrical path”). High-voltage power lines L1 to L5 (L1-H to L5-H, L1-L to L5-L) transmit the power distributed from high voltage power line L7 to respective auxiliary device modules 50000, 60000, 70000, 80000, 90000 Do.

  The high voltage power line L6 (L6-H, L6-L) is a power line leading from the branch point of the high voltage power line L7-H to the inverter module 40000.

  The high voltage power line L8 (L8-H, L8-L) is a power line for receiving the power transmitted from the external rapid charging facility S2, and is connected to the high voltage power line L7 via the relays 41 and 42. There is.

  The BATTHV connector 1100 is used for connection with the battery module 20000, the quick charge connector 1200 is used for connection with the external quick charge facility S2, and the INV connector 1300 is used for connection with the inverter module 40000. The HV connectors 1401 to 1405 are used for connection with the DC / DC module 50000, the charging module 60000, the electric compressor 70000, the heater 80000, and the cooler 90000, respectively.

  The junction box 10000 also has a BMS control connector 1500, a 12V connector 1600, and a vehicle LV connector 1700 for communication with the relay ECU 22 and for transfer of control power.

  The BMS control connector 1500 is used for communication with the battery control unit of the battery module 20000 and for exchange of control power, and the 12V connector 1600 is used for communication with the vehicle ECU 100000 and exchange of control power. 1700 is used for communication with the control unit that each of the DC / DC module 50000, the charging module 60000, the electric compressor 70000, the heater 80000 and the cooler 90000 has, and for exchange of control power. As described above, communication with each of the auxiliary device modules 50000, 60000, 70000, 80000 and 90000 and transfer of control power are integrated in the vehicle LV connector 1700.

  The vehicle ECU 100000 is a vehicle control unit that integrally controls each part of the vehicle A. The vehicle ECU 100000 communicates with the relay ECU 22. In addition, the vehicle ECU 100000 communicates with the inverter module 40000, emits an inverter drive command signal according to the required torque, and the like, and controls the inverter module 40000.

  The battery module 20000 is configured to include a high voltage battery and an electronic control unit (BAT-ECU in FIG. 1) that controls the high voltage battery.

  The inverter module 40000 includes an inverter circuit that converts DC power received from the battery module 20000 into AC power and supplies the AC power to the motor, and an electronic control unit (INV-ECU in FIG. 1) that controls the inverter circuit. .

  The DC / DC module 50000 is a DC / DC converter that steps down DC power received from the battery module 20000 or the like and supplies the DC power to an auxiliary battery etc., and an electronic control unit (DCDC-FIG. ECU) is configured.

  Charging module 60000 is a charge that converts AC power supplied from external power supply S1 (for example, single-phase 100V or single-phase 200V home power supply) outside the vehicle into electric power and sends out the DC power to battery module 20000 etc. It comprises a circuit and an electronic control unit (CHG-ECU in FIG. 1) for controlling the charging circuit.

  The electric compressor 70000 includes a compressor that compresses a refrigerant for air conditioning in the vehicle, and an electronic control unit (not shown) that controls the compressor.

  The heater 80000 is configured to include a heater for heating the battery module 20000 or the like when the temperature is low, and an electronic control unit (not shown) for controlling the heater.

  The cooler 90000 includes a cooler for cooling the charge module 60000 and the like, and an electronic control unit (not shown) for controlling the cooler.

[Junction box configuration]
Subsequently, a specific configuration of the junction box 10000 will be described with reference to FIGS. 2A, 2B, and 3 to 10.

  In each drawing, a common orthogonal coordinate system (X, Y, Z) is shown in order to clarify the positional relationship of each configuration. In the following description, for the convenience of description, the positive direction of the Z axis represents the upward direction of the junction box 10000, the positive direction of the X axis represents the forward direction of the junction box 10000, and the positive direction of the Y axis represents the left direction of the junction box 10000. explain. In each of the drawings, for convenience of explanation, only the components necessary for the explanation are given reference numerals.

  FIG. 2A and FIG. 2B are exploded views of each part accommodated in the junction box 10000 according to the present embodiment.

  The junction box 10000 has a housing 1000 forming a substantially sealed storage space inside, and the base holder 100, the sub-holders 10, the fuses 11 to 15, and the like in the housing 1000 from the lower side, It is housed in the circuit board 221.

  FIG. 2A shows an exploded view of the parts supported by the base holder 100 in the housing 1000. FIG. 2B shows an exploded view of the parts supported by the sub-holder 10 in the housing 1000 in the upper region of FIG. 2A.

  3 to 6 are plan views of the junction box 10000 according to the present embodiment, and are plan views showing the state in which components are mounted in the housing 1000 from the lower side. 3 shows a state in which the base holder 100 is mounted in the housing 1000, FIG. 4 shows a state in which the sub holder 10 is further mounted in the state of FIG. 3, and FIG. In the state, the fuses 11 to 15 are further attached to the sub holder 10, and FIG. 6 shows the state in which the circuit board 221 is further attached in the state of FIG.

  FIG. 7 is a side cross-sectional view of the junction box 10000 according to the present embodiment (a side cross-sectional view at the position of T—T in FIG. 6). 7A shows a state in which only a part of the electric components are mounted in the housing 1000 for the convenience of description, and FIG. 7B shows a state in which all the electric components are mounted in the housing 1000. Represents

  A BATTHV connector 1100, a quick charge connector 1200, an INV connector 1300, accessory HV connectors 1401 to 1405, a BMS control connector 1500, a 12V connector 1600, and a vehicle LV connector 1700 are provided on the side of the housing 1000. The connectors 1100, 1200, 1300, 1401 to 1405, and 1500 connect a power line inside the housing 1000 and a power line outside the housing 1000.

  The housing 1000 has a substantially rectangular parallelepiped outer shape, and a rectangular parallelepiped storage space is formed by plate-like metal members (for example, aluminum materials) arranged on six sides of up, down, left, and right. Further, through holes corresponding to the connectors 1100, 1200, 1300, 1401 to 1405 and 1500 are formed on the side surface of the housing 1000.

  A terminal block (not shown) is provided on the bottom of the housing 1000, and one end of the GND harness 405 is connected. The other end of the GND harness 405 is connected to the circuit board 221. Thereby, the GND potential of the circuit board 221 is secured.

Configuration of Base Holder First, the configuration of the base holder 100 will be described with reference to FIGS. 2A and 3.

  The base holder 100 supports the relays 41 and 42, the harness holder 410, the bus bars 1, 2, 3, 5, 6, 7 and 8, the current sensor 300 and the sensor holder 400. The base holder 100 is made of an insulating material.

  First, the base holder 100 is screwed and fixed to the housing 1000.

  Subsequently, the current sensor 300 is screwed and fixed to the base holder 100 by the sensor holder 400 (corresponding to the fixing member of the present invention).

  The sensor holder 400 according to the present embodiment has a shape in which a sheet metal is bent in a U-shape, the horizontal surface area is fixed to the base holder 100, and the vertical surface area is fixed to the current sensor 300.

  More specifically, the sensor holder 400 is formed with a through hole 400A and a through hole 400B. The through hole 400A is a through hole coaxial with the through hole 300A provided in the current sensor 300. The sensor holder 400 and the current sensor 300 are screwed and fixed by the screws inserted through the through holes 400A and the through holes 300A. Further, by screwing and fixing the through hole 400B to the base holder 100, the current sensor 300 is screwed and fixed to the base holder 100 (the lower surface side of the housing 1000). By fixing the current sensor 300 with such a configuration, it is possible to fix the current sensor 300 inexpensively and easily. Further, by fixing the current sensor 300 with such a configuration, space saving of the support structure in the housing 1000 can be achieved.

  The bus bars 1, 2, 3, 5, 6, 7, 8 and 9 are conductive members (for example, copper alloys) in a substantially flat plate shape, and are formed into a desired shape by press molding or the like.

  A through hole 1A is formed at one end of the bus bar 1, and a through hole 1B is formed at the other end. The bus bar 1 is electrically connected to the BATTHV connector 1100 via the fastening bolt at the position of the through hole 1A, and is electrically connected to the bus bar 2 via the fastening bolt at the position of the through hole 1B.

  Through holes 2A to 2D are formed in the bus bar 2. The bus bar 2 is electrically connected to the INV connector 1300 via the fastening bolt at the position of the through hole 2A, and is electrically connected to the bus bar 1 via the fastening bolt at the position of the through hole 2B. Further, the bus bar 2 is electrically connected to the bus bar 3 via the fastening bolt at the position of the through hole 2C, and is electrically connected to the bus bar 5 via the fastening bolt at the position of the through hole 2D.

  Through holes 3A to 3F are formed in the bus bar 3. The bus bar 3 is electrically connected to the bus bar 2 via a fastening bolt at the position of the through hole 3A. Further, bus bar 3 is electrically connected to corresponding auxiliary HV connectors 1401 to 1405 via fastening bolts at the positions of through holes 3B to 3F, respectively.

  The relays 41 and 42 are screwed to the base holder 100. Terminal 41 A of relay 41 is electrically connected to bus bar 5, and terminal 41 B is electrically connected to bus bar 6. Terminal 42 A of relay 42 is electrically connected to bus bar 7, and terminal 42 B is electrically connected to bus bar 8.

  Through holes 5A and 5B are formed in the bus bar 5. The bus bar 5 is electrically connected to the bus bar 2 at the position of the through hole 5A, and is electrically connected to the terminal 41A of the relay 41 at the position of the through hole 5B.

  Through holes 6A and 6B are formed in the bus bar 6. The bus bar 6 is electrically connected to the terminal 41B of the relay 41 at the position of the through hole 6A, and is electrically connected to the quick charge connector 1200 at the position of the through hole 6B.

  Through holes 7A to 7D are formed in the bus bar 7. Bus bar 7 is electrically connected to BATTHV connector 1100 at the position of through hole 7A (not shown), electrically connected to INV connector 1300 at the position of through hole 7B, and the terminals of relay 42 at the position of through hole 7C. 42A and electrically connected to the bus bar 9 at the position of the through hole 7D.

  Through holes 8A and 8B are formed in the bus bar 8. The bus bar 8 is electrically connected to the terminal 42B of the relay 42 at the position of the through hole 8A, and is electrically connected to the quick charge connector 1200 at the position of the through hole 8B.

  One end of the bus bar 9 is electrically connected to the bus bar 7, and the other end is electrically connected to the fuses 11 to 15 (described later) (see FIG. 2B).

  That is, the bus bars 1, 2, 3, 5, 6, 7, 8 and 9 are connected to the high voltage power line L7-H (corresponding to the "first electrical path" in the present invention) L8-H, shown in FIG. L1-L to L8-L are configured.

  The relay harnesses 401 to 404 are drawn out from the terminals 41A and 41B of the relay 41 and the terminals 42A and 42B of the relay 42, respectively. The relay harnesses 401 to 404 are engaged so as to prevent the relay harnesses 401 to 404 from playing by being engaged with the engagement claws provided on the harness holder 410.

  The harness holder 410 is fixed to the base holder 100 by screwing.

Specific Configuration of Current Sensor Next, a specific configuration of the current sensor 300 will be described with reference to FIG. 2A, FIG. 3 (particularly, with reference to the dotted line region R1), and FIGS. 8 and 9.

  FIG. 8 is an enlarged view showing a support structure of the current sensor 300 according to the present embodiment. FIG. 9 is a view for explaining the arrangement configuration of the current sensor 300 when the junction box 10000 according to the present embodiment is mounted on a vehicle.

  As the current sensor 300, typically, a Hall-type current sensor configured to include a circular core (an undivided cylindrical magnetic core) is used. The current sensor 300 according to the present embodiment is disposed so that the bus bar 1 is inserted into the circular core, and detects the current flowing in the bus bar 1. The detection result of the current sensor 300 is input to the relay ECU 22 via the current sensor harness 310.

  The bus bar 1 inserted in the current sensor 300 is arranged to extend in the vehicle width direction (± Y direction) of the vehicle A. Further, current sensor 300 is arranged such that the central axis direction of its own circular core is parallel to the vehicle width direction of vehicle A (that is, ± Y directions). That is, current sensor 300 surrounds bus bar 1 on the inner circumferential surface of the core such that the central axis direction of the circular core is parallel to bus bar 1 extending in the vehicle width direction of vehicle A.

  More specifically, the current sensor 300, which is a Hall-type current sensor, has a circular shape perpendicular to the long side direction of the bus bar 1 (that is, the current flow direction) in order to accurately detect the current value. Preferably, a core is arranged. In this respect, if the current sensor 300 is disposed such that the central axis direction of the circular core is parallel to the longitudinal direction of the vehicle A (that is, ± X direction), the current sensor 300 When acceleration in the front-rear direction such as vibration or collision of the vehicle A is pushed, it is inclined in the front-rear direction starting from the fixed position of the current sensor 300 (that is, the lower surface side of the housing 1000). In other words, in this arrangement mode, the circular cross section of the core of the current sensor 300 is in the direction of the long side of the bus bar 1 (that is, the current flows) due to acceleration in the front-rear direction such as vibration or collision of the vehicle A. Flow direction).

  From this point of view, the current sensor 300 according to the present embodiment is set such that the central axis direction of the circular core is parallel to the vehicle width direction (± Y direction) of the vehicle. Even when acceleration in the front-rear direction (± X direction) such as vibration or collision of the vehicle is pushed by this arrangement configuration, the current sensor 300 has the circular cross section of the core with respect to the bus bar 1 in the front-rear direction (± Misalignment occurs only in the X direction).

  Furthermore, in the sensor holder 400 according to the present embodiment, the longitudinal direction is disposed in parallel with the longitudinal direction of the vehicle. Since the sensor holder 400 is a sheet metal, the rigidity in the longitudinal direction is higher than the rigidity in the width direction. In other words, current sensor 300 is fixed at a plurality of locations or continuously along the longitudinal direction of the vehicle using sensor holder 400. By arranging the longitudinal direction of the vehicle A and the direction in which the rigidity of the parts is high in parallel in this manner, it is possible to configure the components from inexpensive parts while securing the strength against the collision of the vehicle A.

  With such a configuration, the current sensor 300 can accurately detect the current value even when acceleration in the front-rear direction such as vibration or collision of the vehicle A is pressed.

  When the junction box 10000 of the present invention is mounted on the vehicle A, as shown in FIG. 9, the circumferential direction of the circular core of the current sensor 300 is parallel to the front-rear direction of the vehicle A. Will be arranged to be In other words, junction box 10000 is arranged such that the central axis direction of the circular core of current sensor 300 is parallel to the vehicle width direction of vehicle A.

Following sub holder arrangement, 2B, FIGS. 4-5, with reference to FIG. 10, the configuration of the sub-holder 10.

  FIG. 10 is a perspective view showing the configuration of the sub holder 10 in the junction box 10000 according to the present embodiment.

  The sub holder 10 supports the bus bar 9, the fuses 11 to 15, the harnesses 16 to 20, and the circuit board 221.

  First, the sub holder 10 (corresponding to the “substrate support base” of the present invention) which is a base for mounting the circuit board 221 is screwed and fixed to the base holder 100.

  The sub holder 10 is made of an insulating material. As an insulating material of the sub holder 10, for example, a material (for example, polyethylene or the like) having a dielectric strength higher than that of air is used.

  Sub holder 10 is disposed in housing 1000 so as to cover bus bars 1 to 8 from above. That is, the sub holder 10 has an area substantially the same as the bottom area of the housing 1000 in a plan view, and between the bus bars 1 to 8 and the circuit board 221 and between the bus bars 1 to 8 and the fuses 11 to 15 Shield the space between them.

  Further, on the upper surface of the sub holder 10, a plurality of recessed portions 10A to 10E for respectively embedding the fuses 11 to 15 are formed (see R2 area in FIGS. 4 to 5). The shape of the concave portions 10A to 10E has a shape (that is, a cylindrical shape) along the outer shape of each of the fuses 11 to 15 in order to stably hold the fuses 11 to 15 respectively. The recesses 10A to 10E are arranged such that the longitudinal directions of the fuses 11 to 15 are parallel to each other.

  Moreover, the recessed parts 10A-10E are each divided by partition plate 10F-10I. The partition plates 10F to 10I respectively have, in the upper surface of the sub-holder 10, a region between the recess 10A and the recess 10B, a region between the recess 10B and the recess 10C, a region between the recess 10C and the recess 10D, and the recess 10D It is provided in the area between the recesses 10E.

  Further, on the upper surface of the sub holder 10, screw grooves 10K to 10O and screw grooves 10P to 10T corresponding to the terminal portions of the fuses 11 to 15 are formed at positions adjacent to both ends of the concave portions 10A to 10E.

  Further, on the upper surface of the sub holder 10, locking claws for locking the respective harnesses 16 to 20 for connecting the fuses 11 to 15 and the auxiliary machine HV connectors 1401 to 1405 are formed.

  Through holes 9A to 9E corresponding to the screw grooves 10K to 10O are formed in the bus bar 9, and a through hole 9F connected to the through hole 7D of the bus bar 7 is formed. The bus bar 9 is screwed and fixed to the through holes 11A to 15A respectively formed at one end of the fuses 11 to 15 at the positions of the through holes 9A to 9E, and is electrically connected to one end of each of the fuses 11 to 15 . The bus bar 9 is drawn from the lower surface to the upper surface of the sub holder 10 through the through hole formed at the end of the sub holder 10 so that the exposed area of the bus bar 9 on the upper surface of the sub holder 10 is reduced. ing.

  The fuses 11 to 15 are electronic components that protect the electric circuit from a large current above the rating. Here, the fuses 11 to 15 shut off the overcurrents generated in the high voltage power lines L1-H to L5-H, respectively (see FIG. 1). The through holes 11B to 15B respectively formed at the other ends of the fuses 11 to 15 correspond to the screw grooves 10P to 10T, respectively, and are screwed and fixed together with the harnesses 16 to 20 (corresponding to the insulated wire of the present invention).

  The harnesses 16 to 20 respectively connected to the fuses 11 to 15 are connected to the auxiliary machine HV connectors 1401 to 1405, respectively.

  That is, fuses 11-15 and harnesses 16-20 are connected to high voltage power lines L1-H-L5 passing from the branch point of high voltage power line L7-H to auxiliary HV connectors 1401-1405, respectively, as a power system in junction box 10000. Form H (corresponding to the “second electrical path” of the present invention) (see FIG. 1). Specifically, high voltage power line L3-H is formed by fuse 11 and harness 16, high voltage power line L4-H is formed by fuse 12 and harness 17, and high voltage power line L5 is formed by fuse 13 and harness 18. A high voltage power line L 1 -H is formed by the fuse 14 and the harness 19, and a high voltage power line L 2 -H is formed by the fuse 15 and the harness 20.

  When power is distributed from the battery module 20000 to an operating accessory module (for example, any of the accessory modules 50000, 60000, 70000, 80000, and 90000), the fuses 11 to 15 connected to the non-operating accessory module In the terminal portion or the like, there is a possibility that dielectric breakdown occurs with the bus bars 1 to 8. From such a viewpoint, in the junction box 10000 according to the present embodiment, the sub holder 10 also shields the space between the fuses 11 to 15 and the bus bars 1 to 8.

  The harnesses 16 to 20 are locked by locking claws formed on the sub holder 10.

Configuration of Circuit Board Subsequently, the circuit board 221 on which the relay ECU 22 is mounted is screwed and fixed to the sub holder 10 (see FIGS. 6 and 10).

  The sub holder 10 holds the fuses 11 to 15 in the concave portions 10A to 10E formed on the upper surface side, and supports the circuit board 221 so that the substrate surface is vertically oriented in the region above the fuses 11 to 15 .

  Here, the circuit board 221 has a half or more area, typically about the same area, as the bottom area of the housing 1000 in plan view. However, the circuit board 221 is configured to have an area smaller than the bottom area of the housing 1000.

  The relay ECU 22 (corresponding to the “first control circuit” and the “second control circuit” in the present invention) is mounted on the circuit board 221. The relay ECU 22 is a microcomputer configured to include, for example, a read only memory (ROM), a random access memory (RAM), an input port, an output port, and the like.

  As described above, the relay ECU 22 controls the energization and cutoff of the relays 41 and 42, monitors the current level flowing to the current sensor 300, communicates with the electronic control unit of each power module, and the electronic of each power module. It controls the supply of control power to the control unit. The said function which relay ECU22 has is implement | achieved, for example by CPU referring the control program and various data which were stored in ROM and RAM.

  The circuit board 221 typically has a circuit pattern on both the upper surface and the lower surface, and is supported by the sub holder 10 in an end area where the circuit pattern is not formed. In other words, the circuit board 221 is supported such that the lower surface side of the circuit pattern is separated from the upper surface of the sub holder 10.

  In the circuit board 221, the relay harnesses 401 to 404 and the current sensor harness 310 can be inserted into the circuit board 221 from the lower region than the sub holder 10 in the housing 1000, by themselves and the side surface of the housing 1000. Notches 221a to 221c forming a gap are formed.

  Also, in the sub holder 10, the relay harnesses 401 to 404 and the current sensor harness 310 can be inserted into the circuit board 221 from the lower region than the sub holder 10 in the housing 1000, by themselves and the housing 1000. Notches 10a-10b are formed to form a gap with the side surface.

  Then, the relay harnesses 401 to 404 are connected to the terminal block on the circuit board 221 through the notches 221 a to 221 c of the circuit board 221 and the notches 10 a to 10 b of the sub holder 10. In addition, the current sensor harness 310 is connected to the connector on the circuit board 221 through the notches 221 a to 221 c of the circuit board 221 and the notches 10 a to 10 b of the sub holder 10.

  Further, connectors corresponding to the BMS control connector 1500, the 12V connector 1600, and the vehicle LV connector 1700 are mounted on the circuit board 221, and the corresponding connectors are connected to each other.

  Next, the partition plates 10F to 10I of the sub holder 10 will be described in detail.

  The partition plates 10F to 10I are formed to partition the concave portions 10A to 10E for mounting the cylindrical fuses 11 to 15. The partition plates 10F to 10I also contribute to increasing the creeping insulation distance between the fuses 11 to 15, respectively.

  In addition, each of the partition plates 10F to 10I has such a height that the insulation distance from the parts through which high current flows, such as the fuses 11 to 15 mounted on the sub holder 10 and the bus bar 9 can be secured. And for the insulation of the circuit board 221.

  Here, the circuit board 221 is configured by double-sided mounting. Therefore, in order to secure a mounting area, it is preferable that the area for supporting the circuit board 221 be small.

  Therefore, in the present invention, the partition plates 10F and 10I have the convex portions U and X for supporting the circuit board 221 from the lower surface side on the screw grooves 10P to 10T side, and the partition plates 10G and 10H are screw grooves 10K to 10O. It is comprised so that it may have convex part V and W which support the circuit board 221 from the lower surface side in the side.

  With this configuration, the support area can be reduced while stably supporting the circuit board 221.

  As described above, in the present invention, the partition plates 10F to 10I for partitioning the concave portions 10A to 10E for mounting the fuses 11 to 15 are also used to secure the insulation distance from the circuit board 221, and further to the circuit board By configuring only the support portion 221 with the convex portions U to X, insulation of the circuit board 221 and a mounting area can be secured.

  In other words, even when the central region or the like of the circuit board 221 is bent in the vertical direction due to vibration or the like when the vehicle is traveling, the occurrence of dielectric breakdown between the circuit board 221 and the fuses 11 to 15 is suppressed be able to.

[effect]
As described above, in the junction box 10000 (electrical connection box) according to the present embodiment, the insulating sub-holder 10 (substrate support) is disposed to cover the bus bars 1 to 8 from above, and the fuses 11 to 15 and the circuit board A support structure is provided to support the fuses 11 to 15 and the circuit board 221 so as to spatially shield the bus bars 221 from the bus bars 1 to 8. As a result, it is possible to suppress the occurrence of dielectric breakdown between the bus bars 1 to 8 and the circuit board 221 (or the terminal portions of the fuses 11 to 15) caused by vibration or the like when the vehicle is traveling.

  In addition, the junction box 10000 (electrical connection box) according to the present embodiment has a configuration in which the fuses 11 to 15 are held so as to be embedded in the concave portions 10A to 10E by the sub holder 10 (substrate support). As a result, the space between the bus bars 1 to 8 and the circuit board 221 is effectively utilized to secure the support stability of the fuses 11 to 15 while securing the space distance between the fuses 11 to 15 and the circuit board 221 Is also possible.

  In particular, according to the junction box 10000 (electrical connection box) according to the present embodiment, it is possible to suppress the proximity of the insulation distance caused by vibration or the like when the vehicle A is traveling while realizing downsizing. It is useful.

<Other embodiments>
Although it has been described that the relay ECU 22 communicates with the auxiliary module (the DC / DC module 50000, the charge module 60000, the electric compressor 70000, the heater 80000, and the cooler 90000), the present invention is not limited thereto. Communication may be performed between each accessory module and the vehicle ECU (for example, the vehicle ECU 1000000. Similarly, control power may be supplied to each accessory module from another device (for example, the vehicle ECU 100000). .

  According to the present disclosure, it is possible to realize an electrical connection box having a more preferable storage structure that satisfies the requirements for securing the insulation distance and downsizing.

A Vehicle 100000 Vehicle ECU
10000 junction box 20000 battery module 40000 inverter module 50000 DC / DC module 60000 charging module 70000 electric compressor 80000 heater 90000 cooler L1-H to L8-H high voltage power line (high side)
L1-L to L8-L High voltage power line (low side)
1000 chassis 1100 BATTHV connector 1200 rapid charging connector 1300 INV connector 1401 to 1405 accessory HV connector 1500 BMS control connector 1600 12V connector 1700 vehicle LV connector 100 base holder 1 to 9 bus bar 41 to 42 relay 300 current sensor 400 sensor holder 410 harness Holder 10 Sub-holder 10A to 10E Recess 10F to 10I Partition plate 11 to 15 Fuse 16 to 20 Harness 221 Circuit board 22 Relay ECU

Claims (18)

An electrical junction box for relaying power distribution from a battery to a plurality of load devices, comprising:
And
A bus bar disposed in a lower region in the housing and forming a first electrical path for receiving power supply from the battery and distributing it to the load device;
An insulating substrate support provided so as to cover the bus bar from above in the housing;
An insulated wire disposed on the substrate support and forming at least a portion of a second electrical path leading from the branch point of the first electrical path to the load device;
A fuse connected in the second electrical path for interrupting an overcurrent generated in the second electrical path;
A circuit board supported on the substrate support with the substrate surface directed in the vertical direction;
Equipped with
An electrical connection box, wherein the substrate support holds the fuse in a recess formed on the upper surface side and supports the circuit board in an upper region of the fuse. The electrical connection box according to claim 1, wherein the recess formed in the substrate support has a shape along an outer shape of the fuse. The substrate support has a plurality of recesses corresponding to the number of fuses.
The plurality of recesses are arranged such that the longitudinal direction of the fuses is parallel.
The electrical connection box according to claim 2. The substrate support has a plurality of partition plates that separate a plurality of the recesses on the upper surface, respectively.
The electrical connection box according to claim 3. The electrical connection box according to claim 4, wherein each of the plurality of partition plates has a height higher than an insulation clearance distance between the fuse and the circuit board. The electrical connection box according to claim 4, wherein at least a part of the plurality of partition plates support the circuit board from the lower surface side. The electrical connection box according to claim 1, wherein the substrate support holds the fuse such that a longitudinal direction is substantially horizontal. The electrical connection box according to claim 1, wherein one end of the fuse is connected to the bus bar and the other end is connected to the insulated wire. The electrical connection box according to claim 1, wherein the substrate support has a locking portion that locks the insulated wire. The circuit board has circuit patterns on both upper and lower surfaces,
The electrical connection box according to claim 1, wherein the circuit board is supported such that the circuit pattern on the lower surface side is separated from the upper surface of the substrate support. The electrical connection box according to claim 1, wherein the circuit board includes a first control circuit that communicates with an apparatus outside the housing. The electrical connection box according to claim 1, wherein the circuit board includes a second control circuit that supplies a low voltage control power to a device outside the housing. The electrical connection box according to claim 1, further comprising: a current sensor that detects a current value flowing through the bus bar. The current sensor is a Hall-type current sensor having a circular core,
The electrical connection box according to claim 13, wherein the current sensor is disposed in the housing so as to insert the bus bar into the core. The electrical connection box according to claim 14, wherein a central axis direction of the core is set to be a vehicle width direction of a vehicle when mounted on a vehicle. The electric connection box according to claim 15, wherein the current sensor is fixed to the lower surface side of the housing continuously at a plurality of locations along the longitudinal direction of the vehicle when mounted on a vehicle using a fixing member. . The substrate support has a notch forming a gap between itself and the side surface of the housing,
The electrical connection box according to claim 13, wherein a sensor wire having one end connected to the current sensor and the other end connected to the circuit board is disposed so as to pass through the notch. A vehicle equipped with the electrical connection box according to claim 1.

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