JP2014239095A - Auxiliary power supply unit and electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent positional deviation of a lead part inserted into a through-hole.SOLUTION: An auxiliary power supply unit includes: a plurality of capacitors 21 having a pair of lead parts 23A, 23b led out from the end surface of a body 22 housing a power storage element therein; a first circuit board 39 having the plate surface in the direction along the lead-out direction of the lead parts 23A, 23B; a second circuit board 45 having the plate surface in the direction intersecting with the lead-out direction of the lead parts 23A, 23B and also having a through-hole 42 through which the lead parts 23A, 23B are inserted; and an opposite wall 34A opposed to the second circuit board 45. The opposite wall 34A includes a terminal holding groove 35 which is provided at a position corresponding to the through-hole 42 and to which at least one of the pair of lead parts 23A, 23B is fitted to be held.

Description

  The present invention relates to an auxiliary power supply device and an electrical junction box.

2. Description of the Related Art In recent years, an auxiliary power supply device including a power storage member such as an electric double layer capacitor has been used for the purpose of improving safety of a vehicle such as an automobile and improving fuel consumption.
Here, when the capacity of the capacitor is increased so that it can be used as an auxiliary power source for a large number of loads of the vehicle, the size and weight of the capacitor itself increase.

  However, when the auxiliary power supply device is mounted on a vehicle, the size of the auxiliary power supply device is limited. Therefore, when the capacitor of the auxiliary power supply device is mounted on the circuit board, the main body containing the storage element is mounted on the surface of the circuit board. May be arranged along.

Patent Document 1 describes a capacitor unit including a circuit board and a plurality of capacitors arranged along the plate surface of the circuit board.
In this capacitor unit, the lead portion of each capacitor is bent at a right angle and inserted into the lead wire hole of the circuit board. The plurality of capacitors are positioned by being fitted into a cylindrical holding portion of the base portion.
By doing in this way, compared with the structure which makes a capacitor stand upright with respect to a circuit board, the auxiliary power supply device is made low-profile.

Japanese Patent No. 4710667

However, in the configuration of Patent Document 1, since the capacitor lead wire is bent at a right angle and connected to the circuit board, a problem occurs in the connection between the lead wire and the circuit board due to the stress generated in the bent portion of the lead wire. Is concerned.
In particular, when the capacitance of the capacitor is increased, a longer lead portion is used as the size of the capacitor increases, and stress on the lead portion due to external vibration and impact is likely to occur.

Therefore, if the linear lead part is led out from the end face of the capacitor, and the lead part is inserted into the through hole of the second circuit board having the plate surface in the direction orthogonal to the lead direction of the lead part and soldered, the lead part It is considered that it can be connected to the conductive path of the second circuit board without bending.
Here, when the straight lead portion is inserted into the through hole of the auxiliary circuit board, there is a possibility that the connection of the lead portion to the second circuit board may be hindered if the position of the lead portion is shifted from the through hole.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to prevent positional deviation of a lead portion inserted through a through hole.

  The present invention provides a first circuit board having a plurality of capacitors in which a pair of lead portions are led out from an end face of a main body in which a power storage element is accommodated, and a plate surface in a direction along a lead-out direction from the end face of the lead portion. And a second circuit board having a plate surface in a direction intersecting with a direction in which the lead part is led out from the end face, and having a through hole through which the lead part is inserted, and an opposing wall facing the second circuit board The opposing wall includes a terminal holding groove that is provided at a position corresponding to the through hole and that holds and holds at least one of the pair of lead portions.

  According to this configuration, since at least one of the pair of lead portions is fitted and held in the terminal holding groove, it is possible to prevent the positional deviation of the lead portion inserted through the through hole.

It is preferable to have the following configuration as an embodiment of the above configuration.
The terminal holding groove holds only one of the pair of lead portions.
In this way, the other lead portion of the pair of lead portions is not held in the terminal holding groove, so that the misalignment between the other lead portion and the through hole caused by the assembly tolerance or the like is absorbed. It becomes possible.

A housing member that houses the plurality of capacitors and is fixed to the first circuit board is provided, and the terminal holding groove is provided in the housing member.
If it does in this way, a lead part can be held using the composition of the storage member for storing a plurality of capacitors.

The housing member is configured by fitting a first divided member and a second divided member, and the opposed wall is provided in the first divided member and has a first opposed wall having the terminal holding groove; A second opposing wall provided on the second split member, wherein the second opposing wall rotates around the one lead portion held in the terminal holding groove. It has a concave edge that is shaped along the direction.
If it does in this way, the end face of a capacitor can be covered, absorbing the position gap between through holes which arises by assembly tolerance etc.

A plurality of resistors to which the voltage of each capacitor is applied are mounted on the second circuit board, and the capacitor when the voltage between the capacitors is imbalanced on the first circuit board; A bypass relay for short-circuiting the electrodes is mounted.
If it does in this way, the area of a 1st circuit board can be made small by mounting the resistor of the circuit for preventing the imbalance of the voltage of a capacitor on a 2nd circuit board.

An electric junction box that distributes power supplied from the power source to the load, and is arranged in a path from the power source of the vehicle to the load, the auxiliary power unit, and a circuit body on which electronic components are mounted; An electrical junction box including the auxiliary power supply device and a case for housing the circuit body.
In this way, it is possible to reduce the wire harness by incorporating the auxiliary power supply device in the electrical junction box.

  According to the present invention, it is possible to prevent the positional deviation of the lead portion inserted through the through hole.

The perspective view which shows the auxiliary power supply device of Embodiment 1. Cross section of auxiliary power supply AA sectional view of FIG. Exploded perspective view of auxiliary power supply Perspective view showing the auxiliary power supply body The perspective view explaining the assembly | attachment to the 1st circuit board of a accommodating member The perspective view explaining the assembly | attachment of the 2nd circuit board to the accommodating member in which the capacitor was accommodated The figure which shows the division member of the lower side The disassembled perspective view which shows the electrical-connection box of Embodiment 2. FIG.

<Embodiment 1>
The first embodiment will be described below with reference to FIGS.
The auxiliary power supply device 10 of this embodiment is used as an auxiliary power supply for an electronic brake system of a vehicle such as an electric vehicle or a hybrid vehicle. In the following description, the front and rear direction will be described with the upper side in FIG. 2 as the front and the lower side as the rear, and the left and right direction with reference to the direction in FIG.

As shown in FIG. 1, the auxiliary power supply 10 includes an auxiliary power supply main body 20 accommodated in a case 11 having a rectangular parallelepiped shape.
The case 11 is made of synthetic resin and includes a case main body 12 having an opening 13 on one side and a case cover 18 that closes the opening 13 of the case main body 12.
On the side surface of the case main body 12, a cover locking convex portion 14 protrudes outward.

As shown in FIG. 4, a guide protrusion 15 protrudes inward on the opening 13 side on the inner surface of the upper wall of the case body 12.
The guide protrusion 15 is provided in the vicinity of the opening 13.
An insertion groove 16 through which the edge of the first circuit board 39 is inserted extends in the insertion direction of the auxiliary power source body 20 on the inner surfaces of the front wall and the rear wall of the case body 12.
The insertion groove 16 is formed between a pair of protrusions 17 extending in the insertion direction of the auxiliary power source body 20.
The insertion groove 16 is formed over the entire length of the case body 12.

The case cover 18 has a rectangular plate shape, and a rectangular connector lead-out hole 18A passes therethrough.
Engaged portions 19 are formed on the front and rear edges of the case cover 18 to retain the state where the case cover 18 closes the opening 13 by being engaged with the cover engagement convex portion 14 of the case body 12. .
The locked portion 19 protrudes in a direction orthogonal to the surface of the case cover 18.
The locked portion 19 has a frame shape through which a rectangular locking hole is formed, and has a thickness that can be bent and deformed.

  The auxiliary power source body 20 includes a plurality (four in this embodiment) of capacitors 21, a housing member 26 that houses the plurality of capacitors 21, a first circuit board 39 on which the housing member 26 is placed, and a housing member 26. And a second circuit board 45 attached to the front surface.

As shown in FIG. 3, the capacitor 21 includes a cylindrical main body 22 in which a power storage element is accommodated, and a pair of leads led out linearly from a circular flat end surface of the main body 22 in a direction perpendicular to the end surface. Parts 23A and 23B.
An explosion-proof valve 24 that can be opened and closed is formed on the rear surface of the main body 22.
The lead portions 23 </ b> A and 23 </ b> B are rod-shaped metals having a circular cross section, and extend linearly along the axial direction of the main body 22.

The accommodating member 26 accommodates the plurality of main bodies 22 and is fixed to the first circuit board 39. The accommodating member 26 is configured by fitting the first divided member 30A and the second divided member 30B together. Yes.
A guide groove 28 extending in the insertion direction of the auxiliary power source main body 20 is formed in an intermediate portion on the outer surface of the upper wall of the housing member 26.

The guide groove 28 engages with the guide projection 15 of the case body 12 to guide the auxiliary power supply body 20 in the insertion direction when the auxiliary power supply body 20 is accommodated in the case body 12.
A plurality of communication holes 27 are formed through the rear wall 26 </ b> A of the housing member 26.
The communication holes 27 are circular and are arranged in the same number as the capacitors 21, communicate with the inside of the capacitor 21 through the explosion-proof valve 24 of the capacitor 21, and leak from the capacitor 21 through the explosion-proof valve 24. Release the vapor etc. to the outside.

As shown in FIG. 7, each of the dividing members 30 </ b> A and 30 </ b> B includes a plate-like portion 31 into which the side surface of the main body 22 is fitted, and a partition wall 33 that rises from the peripheral portion of the plate-like portion 31.
The inner surface side of the plate-like portion 31 includes a plurality of concave surfaces 32 curved in an arc shape so as to be in close contact with the side surface of the main body 22 (see FIG. 8).
When the first divided member 30A and the second divided member 30B are fitted together, the main body 22 of the capacitor 21 is sandwiched between a pair of upper and lower concave surfaces 32 provided on the divided members 30A and 30B. As a result, the main body 22 is held between the pair of upper and lower concave surfaces 32 and is allowed to be displaced within a clearance range provided according to the dimensional tolerance between the main body 22 and the concave surface 32. In addition, it is not restricted to the structure which provides a clearance in this way, You may make it position the capacitor 21 about the up-down direction by pinching the main body 22 between the division members 30A and 30B.

The partition wall 33 is formed on the entire circumference of the plate-like portion 31, and the four capacitors 21 arranged side by side in the left and right side walls are allowed to be displaced in the range of the clearance between the side walls in the left and right direction. Is done.
The rear wall of the partition wall 33 is formed in a concave shape in an arc shape, and when the dividing members 30A and 30B are fitted together, a circular communication hole 27 corresponding to each capacitor 21 is formed.
The side wall of the partition wall 33 includes a pair of protruding portions 33A that slightly protrude forward.
The partition wall 33 is provided on the first divided member 30A and faces the second circuit board 45, and the first facing wall 34A (an example of “opposing wall”), and is provided on the second divided member 30B and faces the second circuit board 45. Second opposing wall 34B.

A terminal holding groove 35 for holding the lead portion 23A is formed in the first opposing wall 34A.
The terminal holding groove 35 extends to a predetermined depth with substantially the same width as the lead portion 23A, and when the lead portion 23A is fitted into the terminal holding groove 35, the lead portion in the left-right direction (the direction in which the capacitors 21 are arranged). 23A is positioned.
In this embodiment, since the main body 22 is held between the divided members 30A and 30B and the position is held, the lead portion 23A is in a state of floating from the deepest portion of the terminal holding groove 35. However, the lead portion 23 </ b> A may be fitted into the deepest portion of the terminal holding groove 35.

As shown in FIG. 7, the second opposing wall 34B has a direction in which the other lead portion 23B rotates around the one lead portion 23A held in the terminal holding groove 35 of the first opposing wall 34A. A concave edge 36 is formed along the shape. Accordingly, no terminal holding groove for holding the lead portion 23B is formed in the second opposing wall 34B.
The first divided member 30A and the second divided member 30B are engaged by the locked portions 19 connected to both side surfaces of the second divided member 30B being locked to the locking projections 37 formed on both side surfaces of the first divided member 30A. Are held in a fitted state.
Between the pair of overhang portions 33A on the front surfaces of the opposing walls 34A and 34B, the second circuit board 45 is fitted into the opposing walls 34A and 34B so as to abut or have a slight gap.

The first circuit board 39 and the second circuit board 45 are obtained by printing conductive paths on an insulating plate, and a large number of through holes 38 and 42 pass therethrough.
As shown in FIG. 5, the second circuit board 45 has a plate surface in a direction (crossing direction) orthogonal to the lead-out direction of the lead portions 23 </ b> A and 23 </ b> B, and the first circuit board 39 is the second circuit board 45. And has a plate surface in a direction along the lead-out direction of the lead portions 23A and 23B.
As shown in FIG. 6, the first circuit board 39 is sized such that the accommodation member 26 can be placed on the upper surface thereof, and the connector part 40 and the bypass relay 41 are mounted on the edge part.

The connector terminal 40A derived from the connector section 40 and the terminal of the bypass relay 41 are soldered to the through hole 38.
One end of an L-shaped connection terminal 43 is soldered and connected to the through hole 38 of the first circuit board 39.
A fixing hole 44 for fixing the accommodating member 26 passes through the peripheral edge side of the first circuit board 39.
The fixing hole 44 is circular, and the relative position between the first circuit board 39 and the housing member 26 is fixed by press-fitting a circular stationary protrusion 26B protruding from the bottom surface of the housing member 26. The

The second circuit board 45 has a rectangular shape that is substantially the same size as the front surface of the housing member 26 and is long in the left-right direction. The area of the second circuit board 45 is smaller than the area of the first circuit board 39.
As shown in FIG. 7, the second circuit board 45 is mounted with a voltage dividing resistor 46 made of a chip resistor.
The voltage dividing resistor 46 is provided to balance the voltage between the capacitors 21.
The other end side of the connection terminal 43 is connected to the through hole 42 of the second circuit board 45 by soldering.

A method for assembling the auxiliary power supply 10 will be described.
The voltage dividing resistor 46 is reflow soldered to the second circuit board 45 and the connection terminal 43 is spot soldered.
Each main body 22 is mounted on each concave surface 32 of the first divided member 30A while fitting one lead portion 23A of the four capacitors 21 into the terminal holding groove 35 on the first divided member 30A (FIG. 7).

Then, when the second divided member 30B is fitted to the first divided member 30A, the accommodating member 26 in which the four capacitors 21 are accommodated is formed.
In this state, one lead portion 23A is positioned in the arrangement direction of the capacitors 21 with respect to the housing member 26, and the other lead portion 23B is allowed to be displaced in the rotational direction about the one lead portion 23A. Has been.

Then, the lead portions 23 </ b> A and 23 </ b> B of each capacitor 21 are inserted into the through holes 42 of the second circuit board 45.
At this time, since the lead portion 23A is positioned by the terminal holding groove 35, it can be easily inserted into the through hole 42. As for the lead part 23B, even if a positional deviation occurs according to the assembling tolerance or the like, the assembling tolerance can be absorbed by the positional deviation of the lead part 23B.

The lead portions 23A and 23B are inserted into the through holes 42 and spot soldering is performed, so that the lead portions 23A and 23B are connected to the conductive path of the second circuit board 45.
Further, a surface mount type electronic component such as a bypass relay 41 constituting a control circuit for charging / discharging the capacitor 21 is connected to the first circuit board 39 to the conductive path of the first circuit board 39 by reflow soldering.

Further, the connector portion 40 and the like are mounted on the conductive path of the first circuit board 39 by spot soldering.
One end side of the connection terminal 43 is inserted into the through hole 42 of the second circuit board 45 and spot soldered, and the other end side of the connection terminal 43 is inserted into the through hole 38 of the first circuit board 39 and spot soldered. .
Thereby, the auxiliary power supply main body 22 is formed (FIG. 5).

Next, the auxiliary power supply main body 22 is inserted into the case 11 along the guide groove 28 on the inner surface of the case 11 (FIG. 4).
Accordingly, the guide groove 28 of the housing member 26 is in sliding contact with the guide protrusion 15 of the case 11, and the edge of the first circuit board 39 is fitted into the insertion groove 16 of the case main body 12, whereby the auxiliary power supply main body 22. The insertion direction is guided and accommodated in the case body 12.
Then, when the case cover 18 is put on the case main body 12 in which the auxiliary power supply main body 22 is accommodated, the auxiliary power supply 10 is formed.

According to this embodiment, the following operations and effects are achieved.
The auxiliary power supply device 10 has a plurality of capacitors 21 from which a pair of lead portions 23A and 23B are led out from the end face of the main body 22 in which the power storage element is accommodated, and a plate surface in a direction along the lead-out direction of the lead portions 23A and 23B. A second circuit board 45 having a first circuit board 39 and a plate surface in a direction (direction intersecting) orthogonal to the lead-out direction of the lead parts 23A and 23B and having a through hole 42 through which the lead parts 23A and 23B are inserted. And opposing walls 34A and 34B facing the second circuit board 45, the opposing walls 34A and 34B are provided at positions corresponding to the through holes 42, and at least one of the pair of lead portions 23A and 23B is fitted therein. A terminal holding groove 35 that is inserted and held is provided.
According to the present embodiment, the lead portion 23A (at least one of the pair of lead portions) is fitted and held in the terminal holding groove 35, and the positional deviation of the lead portion 23A inserted through the through hole 42 is prevented. The alignment accuracy when the lead portion 23A is inserted into the through hole 42 can be improved.
In addition, since the second circuit board 45 is disposed at a position where a dead space is easily provided when the capacitor 21 and the first circuit board 39 are provided, the auxiliary power supply device 10 can be reduced in size.

The terminal holding groove 35 holds only one of the pair of lead portions 23A and 23B.
In this way, since the other lead portion 23B of the pair of lead portions 23A and 23B is not held in the terminal holding groove 35, the other lead portion 23B is connected to the through hole 42 caused by an assembly tolerance or the like. It is possible to absorb the misalignment between them.

Furthermore, a housing member 26 that houses the plurality of capacitors 21 and is fixed to the first circuit board 39 is provided, and the terminal holding groove 35 is provided in the housing member 26.
In this way, the lead portion 23 </ b> A can be held using the configuration of the housing member 26 for housing the main body 22 of the capacitor 21.

The accommodating member 26 is configured by fitting the first divided member 30A and the second divided member 30B, and the opposing walls 34A and 34B are provided in the first divided member 30A and have terminal holding grooves 35. A first opposing wall 34A and a second opposing wall 34B provided on the second split member 30B, the second opposing wall 34B having the one lead portion 23A held in the terminal holding groove 35 as the other axis The lead edge 23 </ b> B has a concave edge 36 having a shape along the rotation direction.
In this way, it is possible to cover the end face of the main body 22 in the capacitor 21 while absorbing the positional deviation between the through hole 42 caused by assembly tolerances and the like.

Further, a plurality of voltage dividing resistors 46 (resistors) to which the voltage of each capacitor 21 is applied are mounted on the second circuit board 45, and the voltage between the capacitors 21 is not fixed on the first circuit board 39. A bypass relay 41 that short-circuits the electrodes of the capacitor 21 when the balance occurs is mounted.
In this way, the area of the first circuit board 39 can be reduced by mounting the voltage dividing resistor 46 of the circuit for preventing the voltage imbalance of the capacitor 21 on the second circuit board 45. Can do.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG.
In the second embodiment, the auxiliary power supply 10 is not provided alone, but is provided in a path from the power supply of the vehicle to the load, and is built in the electrical connection box 50 that distributes the power supplied from the power supply to the load. In the following, the same components as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted.

As shown in FIG. 9, the electrical junction box 50 includes a circuit configuration body 51, an auxiliary power supply main body 22, and a case 57 that covers the circuit configuration body 51 and the auxiliary power supply main body 22.
The circuit structure 51 includes a circuit body 52 on which a plurality of electronic components are mounted, and a plurality of connector blocks 53 and a fuse block 54 to which the peripheral edge of the circuit body 52 is attached.

The circuit body 52 includes a circuit board on which a conductive path is printed and a bus bar that is stacked on the circuit board and punched out of a metal plate into the shape of the conductive path, and a plurality of electronic components are mounted thereon.
The connector block 53 is formed of a plurality of connector portions 53A, can be fitted to an external mating connector, and a large number of terminals are soldered to the through holes of the circuit body 52.

The fuse block 54 can be fitted with a large number of fuses, and a large number of terminals are soldered to the through holes of the circuit body 52.
A cover locking piece 55 extends upward at the peripheral edge of the circuit structure 51.
The case 11 covers the circuit structure 51 from above, and a locking projection 56 that locks the cover locking piece 55 is formed on the outer surface of the side wall.
According to the second embodiment, the function of the auxiliary power supply device 10 is built in the electrical connection box 50, so that the wire harness for connecting the devices can be reduced.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the said embodiment, although the auxiliary power supply 10 shall be used for the auxiliary power supply of the electronic brake system of a vehicle, it is not restricted to this.
For example, when the power supply from the battery is interrupted due to a collision accident, the door cannot be released, and it can be used as an auxiliary power supply for a door lock system in which the rescue operation may be hindered. In addition, for example, it can be used as an auxiliary power source for a vehicle equipped with an idling stop function for stopping fuel consumption when the vehicle is stopped by stopping the engine when the vehicle is stopped for the purpose of improving fuel efficiency and starting the engine when the vehicle is restarted.

(2) In the above-described embodiment, the terminal holding groove 35 is formed with a constant width, but is not limited thereto. For example, the deeper the groove, the narrower the width, and the lead portion 23A may be held at a predetermined height of the terminal holding groove 35 (the height at which the groove width becomes narrower).

(3) The number of capacitors 21 is not limited to the four in the above-described embodiment, but may be other numbers, and the shape of the housing member and the like can be changed as appropriate according to the number of capacitors 21.

(4) In the above-described embodiment, the opposing wall 34 </ b> A in which the terminal holding groove 35 is formed is provided in the housing member 26, but is not limited thereto. For example, a housing member may not be provided, or a wall facing the second circuit board 45 may be provided separately from the housing member, and a terminal holding groove may be formed in the facing wall.

10: Auxiliary power supply device 11: Case 20: Auxiliary power supply main body 21: Capacitor 22: Main body 23A, 23B: Lead part 26: Housing member 30A: First divided member 30B: Second divided member 33: Partition wall 34A: First opposing wall (Opposite wall)
34B: second opposing wall 35: terminal holding groove 36: concave edge 39: first circuit board 41: bypass relay 38: through hole 45: second circuit board 42: through hole 46: voltage dividing resistor (resistor)
50: Electric junction box 52: Circuit body

Claims (6)

A plurality of capacitors in which a pair of lead portions are led out from the end face of the main body in which the storage element is accommodated;
A first circuit board having a plate surface in a direction along a direction from the end surface of the lead portion;
A second circuit board having a plate surface in a direction intersecting with a direction from the end surface of the lead portion and having a through hole through which the lead portion is inserted;
An opposing wall facing the second circuit board,
The auxiliary power supply device includes a terminal holding groove that is provided at a position corresponding to the through hole and that holds at least one of the pair of lead portions. The auxiliary power supply device according to claim 1, wherein the terminal holding groove holds only one of the pair of lead portions. A housing member that houses the plurality of capacitors and is fixed to the first circuit board;
The auxiliary power supply device according to claim 1, wherein the terminal holding groove is provided in the housing member. The housing member is configured by fitting a first divided member and a second divided member, and the opposed wall is provided in the first divided member and includes a first opposed wall having the terminal holding groove, A second opposing wall provided on the second split member, wherein the second opposing wall rotates in the direction of the other lead portion around the one lead portion held in the terminal holding groove. The auxiliary power supply device according to claim 3, wherein the auxiliary power supply device has a concave edge portion having a shape along the line. A plurality of resistors to which the voltage of each capacitor is applied are mounted on the second circuit board,
The bypass circuit which mounts a short circuit between the electrodes of the capacitor when an imbalance occurs in the voltage between the capacitors is mounted on the first circuit board. Auxiliary power supply as described. An electrical connection box that is arranged in a path from a power source of a vehicle to a load and distributes power supplied from the power source to the load,
An auxiliary power supply device according to any one of claims 1 to 5,
A circuit body on which electronic components are mounted;
An electrical junction box comprising: a case for housing the auxiliary power supply device and the circuit body.

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