JP2008204988A - Capacitor unit and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-reliability low-profile capacitor unit and its manufacturing method. <P>SOLUTION: By making a configuration and the manufacturing method of the capacitor unit set, such that a capacitor 11 is held horizontally by a holding section 19 so that a pressure regulation valve 15, provided at a positive electrode 12 in the cylindrical capacitor 11 having electrodes on both end faces, is located at the upper side, and a positioning projection 14, provided at the positive electrode 12 in the capacitor 11, is inserted into a fitting section 21 provided in an upper case 20, the electrodes of the adjacent capacitors 11 are welded and jointed by a bus bar; and finally a bus bar terminal integrated with the bus bar and a circuit board are connected electrically. Thus, with the horizontal arrangement of the capacitor 11 at a holding section and the stress-free welding connection of the bus bar, a high-reliability low-profile capacitor unit can be realized. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a capacitor unit mainly used in a system for regenerating braking energy of a vehicle as electric energy, and a method for manufacturing the same.

  In recent years, automobiles equipped with hybrid systems and idling stop systems have been rapidly developed from the viewpoint of protecting the global environment, and various proposals have been made for systems that regenerate braking energy of vehicles as electrical energy. .

  In such a regeneration system, braking energy is temporarily stored as electric energy in a power storage element, the engine is stopped, and the engine is started with the stored electric energy when the vehicle is restarted. In this system, a capacitor-based regenerative system is attracting particular attention because a capacitor that has superior rapid charge / discharge characteristics as compared with a battery can be started at a higher speed.

  However, in order to store electric power enough to start the engine, a large-capacity capacitor is required. Further, since the voltage is low at a general capacitor voltage (about 2.2 V), the voltage is increased by connecting a plurality of capacitors. There is a need. Therefore, the required individual capacitors are increased in size and must be configured as a capacitor unit using a plurality of them. In this case, a capacitor unit including a plurality of large capacitors (for example, a diameter of about 3 cm and a capacity of about 1000 F) has a large outer size. Therefore, in order to mount the capacitor unit on a vehicle, for example, it is disposed in a dead space such as under the floor. It becomes composition.

In order to realize this, it is necessary to reduce the height of the capacitor unit. Therefore, a configuration in which a plurality of capacitors are arranged in the horizontal direction is conceivable. An example of such an arrangement is described in Patent Document 1. This is an example of a backup power supply at the time of a power failure. As shown in FIG. 9, the battery 1 is arranged so that the positive electrode and the negative electrode are different from each other, and the two electrodes are sequentially connected by the conductive material 2 (bus bar). Thus, a plurality of batteries (seven in FIG. 9) are connected in series. This is connected to a plurality of stages (four stages in FIG. 9), and an insulating sheet 3 is provided between the stages. In this way, the battery pack 4 is formed. With the above configuration, the backup power supply with high voltage output is made thin (low profile).
JP 2003-309935 A

  Such a backup power source can certainly be reduced in height, for example, for a backup power source disposed in a gap such as a lower portion of an information processing device rack mainly used indoors, and the information processing device and the backup power source are integrated. Can contribute to the overall size reduction.

  However, considering the case where the backup power supply having such a configuration is mounted on a vehicle, it is assumed that reliability with respect to vehicle vibration is particularly insufficient. That is, since each battery 1 is only connected by the conductive material 2, and only the insulating sheet 3 is provided between the stages, the battery 1 is restrained and fixed to vibration. It is not. Accordingly, there is a possibility that stress is concentrated on the conductive material 2 due to movement of the heavy battery 1 due to vehicle vibration, and the conductive material 2 and the electrode of the battery 1 may be damaged. Even if the battery 1 is changed to a capacitor, there is a possibility that this may be similarly damaged.

  Therefore, the configuration of the conventional low-profile backup power source has a problem that the reliability for the vehicle is insufficient.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a highly reliable low-profile capacitor unit and a method for manufacturing the same.

  In order to solve the above-described conventional problems, the capacitor unit of the present invention and the method for manufacturing the same are firstly arranged so that a pressure regulating valve provided on one electrode of a cylindrical capacitor having electrodes on both end faces is on the upper side. After holding the capacitor in the holding part of the case in the horizontal direction so that the positioning convex part provided on one of the electrodes of the capacitor is inserted into the fitting part provided on the case, between the electrodes of the adjacent capacitors Are connected by welding with a bus bar, and finally, a bus bar terminal integrally formed with the bus bar and a circuit board are electrically connected and a manufacturing method is provided.

  As a result, since the capacitor and the bus bar are connected after the fixing to the holding portion of the capacitor arranged in the horizontal direction is completed, no stress is applied to the capacitor electrode when the bus bar is connected. Furthermore, since the capacitor itself is fixed to the holding portion and is firmly connected by welding, the capacitor does not move even when vehicle vibration is applied, and stress on the bus bar can be avoided. As a result, the object can be achieved.

  According to the capacitor unit and the manufacturing method thereof of the present invention, it is possible to reduce the height of the capacitor in the horizontal direction, and to fix the capacitor to the holding portion and to perform stress-free welding connection with the bus bar. Stress concentration is reduced and high reliability can be obtained at the same time.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a partially exploded perspective view of a capacitor unit according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing bus bar connection in the method for manufacturing the capacitor unit according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing circuit board attachment in the method for manufacturing the capacitor unit according to Embodiment 1 of the present invention. FIG. 4 is a perspective view showing circuit board attachment when the flexible cable of the capacitor unit manufacturing method according to Embodiment 1 of the present invention is used.

  The capacitor unit according to the first embodiment will be described using a vehicle regeneration system as an example.

  In FIG. 1, a plurality of capacitors 11 are cylindrical electric double layer capacitors having a diameter of 3 cm, and electrodes are provided on both end faces thereof. The electrode is configured such that one end face is the positive electrode 12 and the other end face is the negative electrode 13. In the first embodiment, the positive electrode 12 is provided with the positioning convex portion 14, the pressure regulating valve 15, and the protruding portion 16 in which a part of the positive electrode 12 protrudes from the cylindrical shape. Among these, the positioning convex portion 14 and the protruding portion 16 are formed integrally with the positive electrode 12. Further, the positive electrode 12 has a structure that is caulked through an insulating portion (not shown) for internal sealing of the capacitor 11. Accordingly, the positive electrode 12 is arranged in one step deeper than the cylindrical end face (the depth is d shown in FIG. 1). On the other hand, the protrusion 16 has a thickness larger than d for welding with a bus bar described later. The positive electrode 12 and the negative electrode 13 are each formed with three electrode welds 17 for electrical connection with electrodes (not shown) inside the capacitor 11.

  Since the capacitor 11 has a cylindrical shape, the positioning convex portion 14 prevents the electrode welding position with the bus bar described later from shifting, and is provided in a fitting portion (described later) provided in a case (described later) that holds the capacitor 11. By inserting, the positioning of the capacitor 11 is determined. Therefore, the height is larger than d, and the position is formed so as to be on the upper side when the capacitor 11 is arranged in the horizontal direction.

  The pressure regulating valve 15 is provided to prevent the internal pressure of the capacitor 11 from increasing when the electrolyte filled in the capacitor 11 is vaporized due to a change in external temperature or the like. The outer surface of the pressure regulating valve 15 is provided with two holes 15a for discharging the vaporized electrolyte. Therefore, the pressure regulating valve 15 is also formed to be on the upper side when the capacitor 11 is arranged in the horizontal direction. Thereby, the possibility that the pressure regulating valve 15 is clogged with the electrolytic solution and the vaporized electrolytic solution is not released can be reduced, and high reliability can be obtained. In the first embodiment, the pressure regulating valve 15 is arranged directly below the positioning convex portion 14. Further, before the pressure regulating valve 15 is attached, the pressure regulating valve 15 is used as an inlet for the electrolyte into the capacitor 11 and the pressure regulating valve 15 is attached after the injection. Therefore, the pressure regulating valve 15 cannot be formed integrally with the positive electrode 12, and is structured to be attached to the positive electrode 12 by caulking.

  In the first embodiment, both the positioning convex portion 14 and the pressure regulating valve 15 are provided on the positive electrode 12, but these may be provided on any one of the electrodes of the capacitor 11. Further, these need not be provided on the same electrode.

  Such a plurality of capacitors 11 (six in this embodiment) are arranged in the resin lower case 18 so that the positive electrodes 12 and the negative electrodes 13 of the adjacent capacitors 11 are alternately arranged in the horizontal direction. The holding part 19 formed integrally and the holding part 19 of the upper case 20 having the same configuration as the lower case 18 are firmly fixed by being sandwiched. At this time, since the upper case 20 has a shape that exposes the pressure regulating valve 15 provided in each capacitor 11, it does not hinder the release of the vaporized electrolyte. Further, by inserting the positioning protrusions 14 provided on each capacitor 11 into the fitting portion 21 formed integrally with the upper case 20, all the electrode directions of each capacitor 11 are aligned.

  Elastic portions 23 are integrally formed with the holding portions 19 of the lower case 18 and the upper case 20, respectively. As shown in FIG. 1, the elastic portion 23 has a U-shaped cutout structure in the holding portion 19 of the upper case 20, and the U-shaped tip is bent toward the holding portion 19 side (lower side in FIG. 1). It is formed in the state. The elastic portions 23 are provided at two locations for each capacitor 11. Further, although not shown in FIG. 1, a similar elastic portion 23 is also formed in the lower case 18. In this case, the U-shaped tip is formed in a state of bending upward. Therefore, when the capacitor 11 is brought into contact with and sandwiched between the lower case 18 and the upper case 20, the upper and lower elastic portions 23 press the capacitor 11 and can be firmly fixed. The elastic portion 23 may be provided only on either the lower case 18 or the upper case 20.

  Here, a claw portion 24 is integrally formed on the lower case 18, and an elastic protrusion 26 having a locking portion 25 is integrally formed on the upper case 20. Accordingly, when the upper case 20 is fitted into the lower case 18, the elastic protrusion 26 comes into contact with the claw portion 24, the elastic protrusion 26 spreads outward in accordance with the taper shape of the claw portion 24, and the locking portion 25 eventually fits with the claw portion 24. By combining, both are fixed. In the first embodiment, the claw portion 24 and the elastic protrusion 26 are provided at two locations on the front side and the rear side in FIG. 1. However, the number of the claw portions 24 and the elastic projections 26 may be more than two. You may provide in side surfaces other than an opening part (after-mentioned).

  Further, an insert nut 27 for connecting a power cable (described later) is embedded in an end portion of a bus bar described later in the upper case 20. A boss 28 for fixing a circuit board, which will be described later, is also formed integrally with the upper case 20.

  Next, a method for assembling the components shown in FIG. 1 will be described.

  First, the capacitor 11 is arranged on the holding portion 19 of the lower case 18. As a result, the capacitors 11 are arranged in the horizontal direction, so that the height can be reduced. At this time, as shown in FIG. 1, the positioning projections 14 are arranged so that the positive electrodes 12 and the negative electrodes 13 are alternately arranged so that the positioning convex portions 14 are on the upper side at the same time.

  Next, the upper case 20 is put on the lower case 18. At this time, each capacitor 11 is covered while turning so that all the positioning convex portions 14 are inserted into the fitting portions 21. Thereby, as described above, when the locking portion 25 of the elastic protrusion 26 is fitted to the claw portion 24 and both are fixed, the directions of the electrodes of the capacitors 11 are aligned.

  In addition, in FIG. 1, the positioning convex part 14 may be provided in the lower part of an electrode, and the fitting part 21 may be provided in the lower case 18 in the position corresponding to it. In this case, since the directions of the electrodes are aligned when the capacitor 11 is arranged on the holding portion 19 of the lower case 18, it becomes easier to manufacture.

  Here, the inner diameter of the holding portion 19 is formed to be slightly larger than the outer diameter of the capacitor 11, but the elastic portion 23 is bent toward the capacitor 11, so that the upper case 20 and the lower case 18 are By fitting, the capacitor 11 comes into contact with the elastic portion 23 and is firmly fixed by the elasticity. By adopting such a configuration, the tolerance of the capacitor 11 and the holding portion 19 can be absorbed, so that the capacitor 11 can be reliably fixed.

  The assembled state is shown in FIG. Each capacitor 11 is firmly held by the reaction force of the upper and lower elastic portions 23. Further, a window into which the bus bar 30 is fitted is opened on the electrode side of the capacitor 11 (left and right side in FIG. 1). By inserting the bus bar 30 into the opening 30a, the capacitor 11 is electrically and mechanically connected.

  The bus bar 30 is made of copper having a surface subjected to rust prevention treatment such as plating, and the positioning convex portion 14 and the pressure regulating valve 15 are exposed, and the others are press-molded into a shape covering the opening 30a. Here, bent portions 32 are provided at two locations on portions excluding the portion welded to the positive electrode 12 and the negative electrode 13 and the bus bar terminal 31 connected to the circuit board described later. Thereby, since the external stress such as during welding or vehicle vibration applied to the bus bar 30 at the bent portion 32 can be absorbed, the possibility of breakage of the bus bar 30 can be reduced and the reliability is improved. The bus bar terminal 31 and the bent portion 32 are formed integrally with the bus bar 30.

  Next, a method for attaching the bus bar 30 will be described.

  First, the bus bar 30 is fitted into the opening 30a as shown by the arrow in FIG. Next, the portion indicated by x on the bus bar 30 is laser-welded. Thereby, since the resistance of the connection part of an electrode and the bus-bar 30 can be lowered | hung, even if a heavy current flows, the heat_generation | fever in a connection part can be suppressed and the thermal deterioration of the capacitor 11 is reduced. Therefore, high reliability can be obtained.

  The welded portion is just a portion other than the protruding portion 16 provided on the positive electrode 12 and the electrode welded portion 17 of the negative electrode 13. As a result, the electrodes of the adjacent capacitors 11 are electrically and mechanically connected. At this time, since the capacitor 11 has already been positioned by the lower case 18 and the upper case 20 and is firmly fixed, it is possible to perform laser welding accurately and without applying stress to the electrodes of the capacitor 11, and reliability. Improves. At the same time, since the bus bar terminal 31 is inserted and fixed in the bus bar terminal groove 33 formed integrally with the upper case 20, the position of the bus bar terminal 31 is also determined. Laser welding is shown as spot welding at 5 points per electrode in FIG. 1, but the welded part needs to be more reliable due to factors such as severe vibration conditions at the installation location of the vehicle. May be continuously welded linearly.

  All the capacitors 11 are electrically and mechanically connected by sequentially performing the above process on each opening 30a. In the first embodiment, all the capacitors 11 are connected in series, but this can be done in parallel by changing the direction of the capacitors 11 or connecting the electrodes of the plurality of capacitors 11 with one bus bar 30. You may connect in series and parallel.

  What was assembled so far is shown in FIG. A bus bar 30 is fixed to each opening 30a. 3, the bus bar 30 on the left front side is the end of the six capacitors 11 in series. Therefore, in order to connect the power cable 34 to the outside, the bus bar 30 is bent at right angles along the lower case 18 and the upper case 20. It has a different shape. The power cable 34 is electrically connected together with the bus bar 30 by being fastened to the insert nut 27 by a screw 35.

  A circuit board 36 is disposed on the upper case 20. In the first embodiment, a circuit for controlling the voltage balance of each capacitor 11 is formed on the circuit board 36, but drawing of the circuit components is omitted. Terminal holes 37 and screw holes 38 are provided at positions corresponding to the bus bar terminals 31 and the bosses 28 of the circuit board 36, respectively. Therefore, by inserting the terminal hole 37 into the bus bar terminal 31, the circuit board 36 is disposed on the upper case 20. At this time, the size of the terminal hole 37 is larger than that of the bus bar terminal 31 so that the bus bar 30 is not stressed. Therefore, simply inserting the bus bar terminal 31 into the terminal hole 37 causes the circuit board 36 to wobble and the position is not fixed. Therefore, first, the circuit board 36 is fixed with the screw 35 by matching the positions of the boss 28 and the screw hole 38. Thereafter, by soldering the bus bar terminal 31 to the circuit board 36, the bus bar 30 can be electrically connected to the circuit board 36 without applying stress to the bus bar 30, and high reliability can be obtained. Further, since the bus bar terminal 31 is formed at the tip bent from the bus bar 30 into a crank shape, the stress applied to the bus bar terminal 31 is absorbed by the crank portion, and the influence of the stress is not directly transmitted to the bus bar 30. is doing. From this point of view, high reliability can be obtained.

  In addition, since the circuit board 36 is disposed at the upper part of the upper case 20, even if the vaporized electrolytic solution is discharged from the pressure regulating valve 15, the circuit board 36 is not in direct contact with the circuit board 36. Therefore, the possibility of corrosion of the circuit board 36 is reduced and the reliability is increased.

  The manufacturing method of the capacitor unit having the above configuration is summarized as follows.

  1) The capacitor 11 is held by the holding portion 19 so that the pressure regulating valve 15 is on the upper side and the positioning convex portion 14 is inserted into the fitting portion 21, and is sandwiched between the lower case 18 and the upper case 20.

  2) The bus bar 30 is welded and joined between the electrodes of the adjacent capacitors 11 located in the opening 30a.

  3) The bus bar terminal 31 formed integrally with the bus bar 30 and the circuit board 36 are electrically connected.

  In this way, after fixing the capacitor 11, the bus bar 30 is welded and joined, or by connecting to the circuit board 36 via the bus bar terminal 31 so that no stress is applied to the bus bar 30, stress on the electrode of the capacitor 11 is reduced. The manufacturing method can reduce the influence and obtain high reliability.

  Here, the voltage balance control circuit of the circuit board 36 according to the first embodiment can be entirely composed of surface mount components. However, a large capacitor 11 is used to increase the capacity. Therefore, although the circuit board 36 of FIG. 3 has a very large board size, the area occupied by the mounted circuit components is extremely small. Therefore, the unused portion of the circuit board 36 is wide and wasteful, and when the capacitor unit is installed in a place where vehicle vibration is greatly transmitted, the possibility that the circuit board 36 resonates as the area increases.

  Therefore, in such a case, as shown in FIG. 4, the circuit board 36 is made the minimum necessary shape smaller than the upper case 20, and is fixed by tightening a screw 35 on a boss 28 provided on the upper portion of the upper case 20. Keep it. Each bus bar terminal 31 and the circuit board 36 are connected by a flexible cable 39. With this configuration, the circuit board 36 is not wasted, the possibility of resonance due to vehicle vibration can be reduced, and the reliability is further improved. In addition, since the flexible cable 39 is flexible, even if soldered to the bus bar terminal 31, there is almost no influence of stress on the bus bar 30 as compared with the configuration of FIG.

  The connection between the bus bar 30 and the circuit board 36 is not limited to the flexible cable 39, and a general cable or a flat cable obtained by joining a plurality of cables may be used.

  With the above-described configuration and manufacturing method, the capacitor 11 is arranged in the horizontal direction and can be manufactured without applying stress to the bus bar 30, and the capacitor 11 is firmly sandwiched between the lower case 18 and the upper case 20, and the bus bar Since 30 is firmly fixed to the electrode of the capacitor 11 by welding, a highly reliable low-profile capacitor unit was obtained.

  In the first embodiment, six capacitors 11 are used. However, it is sufficient to mount a necessary quantity according to the power specifications required for the capacitor unit. Furthermore, it is good also as a structure which connects several capacitor units.

(Embodiment 2)
FIG. 5 is a partially exploded perspective view of the capacitor unit according to Embodiment 2 of the present invention. FIG. 6 is a perspective view showing bus bar connection in the method for manufacturing a capacitor unit according to the second embodiment of the present invention. FIG. 7 is a perspective view showing circuit board attachment in the method for manufacturing a capacitor unit according to the second embodiment of the present invention. FIG. 8 is a perspective view showing circuit board attachment when the flexible cable of the capacitor unit manufacturing method according to the second embodiment of the present invention is used.

  The capacitor unit according to the second embodiment will be described by taking the vehicle regeneration system as an example, as in the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  That is, the differences from the first embodiment are as follows.

  1) The holding portion 19 is provided only on both electrode sides of the capacitor 11 so that the central portion of the capacitor 11 is exposed.

  2) Thus, the case was divided into a right case 40 and a left case 41.

  3) Since the center portion of the capacitor 11 is exposed, the right case 40 and the left case 41 cannot be directly mechanically connected, and the right case 40 and the left case 41 are connected via a female screw rod 42 disposed on the exposed portion. To be connected with screws 35.

  4) Along with this, the claw portion 24 and the elastic protrusion 26 were abolished.

  5) Since the screw 35 is fastened to the female threaded rod 42, the screw hole 38 provided in the right case 40 and the left case 41 and the position that does not interfere with the holding portion 19 (specifically, the left case 41 in FIG. The insert nut 27 was moved to the lower part.

  6) Since the holding portion 19 is provided only on both electrode sides of the capacitor 11, the shape of the elastic portion 23 provided in the holding portion 19 was changed.

  7) Accordingly, a rib 43 for positioning the capacitor 11 is provided in the holding portion 19.

  First, the structure of the capacitor unit according to the second embodiment will be described focusing on the above differences.

  As shown in FIG. 5, the case for fixing the capacitor 11 is divided into a right case 40 and a left case 41. The capacitor 11 is fixed by being inserted into a cylindrical holding portion 19 provided in the right case 40 and the left case 41.

  Here, details of the holding portion 19 will be described. As in the first embodiment, the holding portion 19 is provided with an elastic portion 23 for firmly fixing the capacitor 11, but the shape of the holding portion 19 includes four cutout portions 44 up to the middle of the holding portion 19 (in FIG. 5). The holding portion 19 is provided at two locations on the upper side and two locations on the lower side. Accordingly, the elastic portion 23 is located between the two cutout portions 44 in the upper and lower portions. In addition, the notch part 44 is not specifically limited to four places.

  The inner diameter of the holding portion 19 is formed to be slightly larger than the outer diameter of the capacitor 11, but the tip portion of the elastic portion 23 is configured to be thicker. The tip portion and the two cutout portions 44 provide elasticity. Further, ribs 43 are provided on the left and right wall surfaces of the holding portion 19 in FIG. Therefore, when the capacitor 11 is inserted into the holding portion 19 from the direction of the arrow in FIG. 5, the capacitor 11 is guided parallel to the holding portion 19 while abutting the rib 43 while expanding the elastic portion 23. Therefore, the capacitor 11 contacts the elastic portion 23 while being positioned by the rib 43, and is firmly fixed by the elasticity. By adopting such a configuration, the tolerance of the capacitor 11 and the holding portion 19 can be absorbed, so that the capacitor 11 can be reliably fixed. Here, in order to align the position of the capacitor 11 when the capacitor 11 is inserted into the holding portion 19, the direction of the capacitor 11 is adjusted so that the positioning convex portion 14 is inserted into the fitting portion 21 as in the first embodiment. Insert into the holding part 19 while rotating.

  With such a configuration, the central portion of the capacitor 11 is exposed. Therefore, for example, when the capacitor unit is arranged so as to be able to ventilate, the capacitor 11 particularly when a large current flows during charging due to vehicle braking or discharging due to engine start. Temperature rise is suppressed. As a result, the life of the capacitor 11 can be extended and high reliability can be obtained.

  Next, a method for assembling the capacitor unit according to the second embodiment will be described.

  The capacitor 11 is inserted into each holding portion 19 of the right case 40 and the left case 41 in a state where the polarities of the electrodes are aligned in different directions. Thereby, the capacitor 11 is firmly fixed to the right case 40 and the left case 41.

  Next, four female screw rods 42 are arranged at positions corresponding to the four screw holes 38 provided in the right case 40 and the left case 41 (two of them are shown in FIG. 5). The female screw rod 42 has a structure in which a female screw that matches the screw 35 is cut on the entire inside of the cylinder. Therefore, after the female screw rod 42 is disposed, the right case 40 and the left case 41 are tightened into the female screw rod 42 from the screw holes 38 on both sides of the right case 40 and the left case 41, respectively. It is mechanically and firmly fixed via. As a result, both ends of the capacitor 11 are fixed by the holding portions 19 of the right case 40 and the left case 41.

  The assembled state is shown in FIG. The electrodes of each capacitor 11 are arranged in an opening 30 a provided integrally with the right case 40 and the left case 41. Next, the bus bar 30 is fitted into each opening 30a and welded and joined to the electrode to electrically and mechanically connect. The shape of the bus bar 30 and the welding process are the same as those in the first embodiment.

  FIG. 7 shows a state where the bus bar 30 is connected. Next, the power cable 34 is attached with screws 35 to the bus bar 30 connected to the capacitor 11 at both ends of the capacitor unit. Further, after inserting the terminal holes 37 of the circuit board 36 into the bus bar terminals 31 and fastening the screws 35 to the bosses 28 through the screw holes 38 of the circuit board 36, the circuit board 36 is fixed, and then each bus bar terminal 31 is fixed. The circuit board 36 is electrically connected by soldering. The details are the same as in the first embodiment.

  In the case where the vibration condition is installed in a severe place as in the first embodiment, the circuit board 36 is minimized as shown in FIG. 8, and the connection between the circuit board 36 and the bus bar terminal 31 is connected to the flexible cable 39. You may connect with. Thereby, further high reliability is obtained.

  Further, as apparent from the above description, the manufacturing method of the second embodiment is the same as the order of 1) to 3) summarized in the first embodiment.

  With the above-described configuration and manufacturing method, the capacitor 11 is arranged in the horizontal direction, and can be manufactured without applying stress to the bus bar 30, and the capacitor 11 is firmly fixed by the right case 40 and the left case 41, and the bus bar. Since 30 is firmly fixed to the electrode of the capacitor 11 by welding, a highly reliable low-profile capacitor unit was obtained. Furthermore, by adopting the configuration of the second embodiment, since the temperature rise of the capacitor 11 is suppressed, the life is extended, and further high reliability is obtained.

  In the first and second embodiments, the capacitor 11 is described as having a cylindrical shape. However, the present invention is not limited to this and may be a prismatic shape.

  Moreover, what is necessary is just to determine the connection wiring kind of capacitor 11 (parallel or series-parallel in addition to series), the quantity, and the multiple connection of capacitor units according to the required power specifications as in the first embodiment.

  Furthermore, although the vehicle regeneration system has been described as an example in the first and second embodiments, the present invention is not limited to this, and the present invention may be applied to an emergency power source for vehicle emergency or idling stop.

  In the capacitor unit according to the present invention, since the capacitors are arranged in the horizontal direction, it is possible to reduce the height, and it is possible to increase the reliability because the configuration and the manufacturing method do not apply stress to the capacitor electrode, In particular, it is useful as a power storage device that is used in a system that regenerates braking energy of a vehicle as electric energy.

1 is a partially exploded perspective view of a capacitor unit according to Embodiment 1 of the present invention. The perspective view which shows the bus-bar connection of the manufacturing method of the capacitor unit in Embodiment 1 of this invention The perspective view which shows the circuit board attachment of the manufacturing method of the capacitor unit in Embodiment 1 of this invention The perspective view which shows the circuit board attachment at the time of using the flexible cable of the manufacturing method of the capacitor unit in Embodiment 1 of this invention The partial exploded perspective view of the capacitor unit in Embodiment 2 of the present invention The perspective view which shows the bus-bar connection of the manufacturing method of the capacitor unit in Embodiment 2 of this invention The perspective view which shows the circuit board attachment of the manufacturing method of the capacitor unit in Embodiment 2 of this invention The perspective view which shows the circuit board attachment at the time of using the flexible cable of the manufacturing method of the capacitor unit in Embodiment 2 of this invention A perspective view of a conventional backup power supply

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Capacitor 12 Positive electrode 13 Negative electrode 14 Positioning convex part 15 Pressure regulation valve 16 Protrusion part 18 Lower case 19 Holding part 20 Upper case 21 Fitting part 23 Elastic part 28 Boss 30 Bus bar 31 Bus bar terminal 32 Bending part 35 Screw 36 Circuit board 39 Flexible cable 40 Right case 41 Left case

Claims (9)

A plurality of capacitors having a cylindrical shape and electrodes provided on both end faces of the cylindrical shape;
A protruding portion in which a part of one of the electrodes of the capacitor protrudes from the cylindrical shape;
A positioning protrusion provided on one of the electrodes of the capacitor;
A pressure regulating valve provided on one of the electrodes of the capacitor;
A bus bar having a shape that exposes the positioning convex part and the pressure regulating valve while connecting the capacitors in series, in parallel, or in series and parallel,
A case in which the pressure regulating valve is exposed and a fitting portion with the positioning convex portion and a holding portion for holding the capacitor in a horizontal direction are integrally formed,
A circuit board having a control circuit for the capacitor,
The capacitor is held by the holding portion so that the pressure regulating valve is on the upper side and the positioning convex portion is inserted into the fitting portion,
Between the electrodes of the adjacent capacitors are welded and joined by the bus bar,
A capacitor unit formed by electrically connecting a bus bar terminal formed integrally with the bus bar and the circuit board. The capacitor unit according to claim 1, wherein the holding portion has an elastic portion arranged so as to contact the capacitor. The capacitor unit according to claim 1, wherein the holding portion is provided only on both electrode sides of the capacitor, and the case is configured so that a central portion of the capacitor is exposed. The capacitor unit according to claim 1, wherein the circuit board has a smaller shape than the case, and the bus bar and the circuit board are connected by a cable. The capacitor unit according to claim 4, wherein the cable is a flexible cable. The capacitor unit according to claim 1, wherein a bent portion is provided in a part of the bus bar. The capacitor unit according to claim 1, wherein the circuit board is disposed on an upper portion of the case. The capacitor unit according to claim 7, wherein the circuit board is fixed to a boss integrally formed with the case with a screw. A plurality of capacitors having a cylindrical shape and electrodes provided on both end faces of the cylindrical shape;
A protruding portion in which a part of one of the electrodes of the capacitor protrudes from the cylindrical shape;
A positioning protrusion provided on one of the electrodes of the capacitor;
A pressure regulating valve provided on one of the electrodes of the capacitor;
A bus bar having a shape that exposes the positioning convex part and the pressure regulating valve while connecting the capacitors in series, in parallel, or in series and parallel,
A case in which the pressure regulating valve is exposed and a fitting portion with the positioning convex portion and a holding portion for holding the capacitor in a horizontal direction are integrally formed,
A circuit board having a control circuit for the capacitor,
After holding the capacitor in the holding portion so that the pressure regulating valve is on the upper side and the positioning convex portion is inserted into the fitting portion,
Welding the electrodes of the adjacent capacitors with the bus bar,
A capacitor unit manufacturing method for electrically connecting a bus bar terminal integrally formed on the bus bar and the circuit board.

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