JP3960288B2 - Capacitor unit - Google Patents

Description

  The present invention relates to an emergency power source for an electronic device using a battery or the like, and more particularly to a capacitor unit used in an electronic brake system or the like that electrically brakes a vehicle.

  In recent years, the development of hybrid cars and electric cars has been promoted rapidly from the viewpoint of protecting the global environment and improving fuel efficiency.

  In addition, various functions for controlling vehicles are rapidly becoming electronic, and vehicle braking is shifting from conventional mechanical hydraulic control to electrical hydraulic control. Various electronic brake systems have been proposed. ing.

  For important functions such as brakes, if the battery used as its power source drops in voltage or fails due to unforeseen circumstances, hydraulic control becomes impossible if power cannot be supplied. In many cases, a redundant system is used.

  Conventionally, another method of using a battery as an emergency power source has been proposed. However, the battery has a property of aging, and when used for a vehicle, only a life of about 5 years can be expected at the maximum.

  In addition, it is difficult to detect the deterioration state in the process, and it is difficult to perform the function as an emergency power source when an unexpected situation occurs.

  Therefore, a capacitor such as an electric double layer capacitor has been attracting attention as an emergency power supply that is changing to a battery in recent years. Capacitors can be used, for example, by charging them when the system is operating and discharging them when the system is not operating, so that their lifetime can be extended several times that of the battery, and they can withstand 15 years of use, which is the target lifetime of the vehicle. It is said to get.

  Further, by monitoring the capacitance value and the internal resistance which are the characteristic values of the capacitor, it is possible to grasp the change in the characteristic.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP-A-10-189402

  However, the capacitor has a drawback that its withstand voltage is low in nature. Therefore, in order to obtain a necessary voltage, it is necessary to use a plurality of capacitors connected in series. Depending on the amount of energy required, it may be necessary to connect it in parallel. In addition, it is necessary to provide a control circuit for charging and discharging the capacitor.

  Although the characteristics of capacitors have been attracting attention, there has not been much proposal of a structure that can withstand the vehicle life as an emergency power supply unit in which a plurality of capacitors and a control circuit are integrated.

  SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. A system for a system to be used by unitizing a capacitor block composed of a plurality of capacitors and a control circuit unit for controlling charging / discharging so as to increase reliability and safety. It is intended to contribute to the improvement of reliability and safety.

  In order to solve the above-mentioned problems, according to the first aspect of the present invention, a plurality of capacitors are sandwiched in a holder and electrically connected in series or in parallel to a wiring board provided on the top of the capacitor. A capacitor block, a control circuit unit that configures a charge / discharge circuit for charging / discharging the capacitor block, and a connector for electrically connecting them, and the capacitor is charged / discharged by a charge / discharge signal of an external load. The capacitor unit is configured to be capable of holding a plurality of capacitors connected in series or in parallel with high reliability and providing a charge / discharge circuit to maximize the characteristics of the capacitor. It has the effect of being able to.

  According to a second aspect of the present invention, the control circuit unit includes an input / output connector electrically connected to an external load, and is integrally housed in a case together with the capacitor block. It has the effect that it can be set as an independent product structure as an emergency power supply unit having a connection connector.

  In the invention according to claim 3 of the present invention, the plurality of capacitors have two-pole electrodes made of lead wires extending in the same direction, and a wiring in which a circuit pattern for connecting them in series or in parallel is formed. It is mounted on a substrate, and has an effect of facilitating wiring of capacitors in series or in parallel and improving connection reliability.

  According to a fourth aspect of the present invention, a plurality of height regulating bosses are provided on the upper surface of the holder so as to maintain a constant distance between the upper surface of the capacitor and the wiring board. The length of the lead wire can be kept constant, the stress in the soldered portion of the capacitor lead wire caused by the difference in thermal expansion of the component due to changes in environmental temperature can be kept constant, and the quality of the soldered portion This has the effect of achieving uniformization.

  According to a fifth aspect of the present invention, at least two of the height regulating bosses have projections for positioning the wiring board, and holes corresponding to the wiring board are formed in each of the positions. It has a configuration having a regulation function, and has the effect of stabilizing the positional relationship between the position of the lead wire of the capacitor and the wiring board.

  According to a sixth aspect of the present invention, at least two of the height regulation bosses have screw holes for fixing the wiring board, and the wiring board is fixed with screws so that the holder and the wiring are fixed. The board can be fixed at a certain height, and the length of the lead wire of the capacitor connected to the wiring board can be increased by fixing the wiring board with screws before soldering the lead wire to the wiring board. It becomes possible to keep constant, and it has the effect that assembly property and soldering work become easy.

  According to a seventh aspect of the present invention, the height regulating boss is provided with a positioning projection and a screw hole on a concentric circle, and the positioning projection is set lower than the thickness of the wiring board. According to the configuration, it is possible to perform positioning and screwing at the same place, and it is possible to reliably prevent backlash of the wiring board after screwing.

  According to an eighth aspect of the present invention, the lead wire extending in the same direction from the capacitor has a length from the outlet of the capacitor to the fixed portion of the wiring board in an intermediate portion where the lead wire is soldered and fixed to the wiring board. Compared to the case where the length of the capacitor lead wire connected to the wiring board is made straight, the component due to changes in environmental temperature It is possible to relieve stress in the soldered portion of the capacitor lead wire due to the difference in thermal expansion of the capacitor and to improve the quality of the soldered portion.

  The invention according to claim 9 of the present invention has a valve-opening structure that discharges the electrolytic solution to the bottom so that the internal burst of the capacitor does not occur at the time of abnormality. It is possible to prevent rupture due to alteration of the internal electrolyte when the above is added, and there is an effect that damage can be reduced in an unexpected situation.

  The invention according to claim 10 of the present invention prevents the occurrence of migration due to humidity between adjacent lead lands by arranging the lead lands of adjacent capacitors on the wiring board to have the same potential. Has the effect of being able to

  According to the eleventh aspect of the present invention, when a plurality of capacitors connected in series or in parallel are charged through a control circuit, the balance corresponding to the number of series is applied so that the charging voltage can be applied equally to each capacitor. By mounting the voltage resistor in parallel with the capacitor, it is possible to equalize the charging voltage to each capacitor when charging the capacitor, prevent deterioration as a capacitor block, and enable long-term use Has an effect.

  The invention according to claim 12 of the present invention is such that the wiring board of the capacitor block has a test point for monitoring the voltage and characteristics (capacitance, resistance) of each parallel block of the capacitor. In order to prolong the service life of the capacitor, it is desirable that the characteristics of the capacitor to be used are as uniform as possible. By ascertaining the characteristics when the capacitor block is assembled, a capacitor unit having a stable quality that can be used for a long time is provided. Has the effect of becoming possible.

  According to a thirteenth aspect of the present invention, the control circuit unit has a function of monitoring the voltage and characteristics of the series connection or parallel connection of the capacitor blocks. In addition to grasping the change, there is an effect that it is possible to notify the failure by communicating with the system when out of the predetermined characteristic range.

  According to the fourteenth aspect of the present invention, the holder is provided with a plurality of storage cylinder portions so as to sandwich and hold the plurality of capacitor body portions so that the capacitor does not move up and down and left and right due to an external vibration factor. The capacitor unit is configured to be fixed to the capacitor, and when used in a vehicle or the like, the capacitor vibrates up and down, left and right due to large vibrations applied, and an acceleration load is applied to the soldered portion of the capacitor lead wire. This prevents the deterioration of the life of the capacitor and promotes the long-term reliability of the capacitor unit.

  According to the fifteenth aspect of the present invention, the storage cylinder of the holder has an inner diameter slightly larger than the outer diameter of the capacitor, and the capacitor is press-fitted and held by two or more ribs provided on the inner surface thereof. As a result, the capacitor can be held more reliably and the holding force can be stabilized.

  According to a sixteenth aspect of the present invention, the holder cylindrical portion of the holder has an inner diameter slightly larger than the outer diameter of the capacitor, and is composed of two or more slits provided on the inner surface and holding claws. By holding the capacitor with the elastic piece, there is an effect that the capacitor can be held more securely and the holding force can be greatly improved.

  The invention according to claim 17 of the present invention specifies that the holding force of the capacitor is in the range of 0.1 kgf to 10 kgf in terms of the pulling direction of the capacitor. The holding power when considering the weight of the solder, the allowable stress of the soldering part to the wiring board, the insertion force of the capacitor into the storage cylinder part, etc. is specified, and long-term reliability is ensured by managing this It has the effect of being able to.

  According to the eighteenth aspect of the present invention, the capacitor block is attached to the attachment position in the case via a plurality of attachment portions provided on the outer periphery of the holder, and the bottom surface of the capacitor incorporated in the holder is on the bottom surface of the case. In contrast, it is configured to maintain a constant interval. By supporting all the weights of multiple capacitors with a holder, the wiring board is not subjected to any heavy load, and the capacitor block is stored in the case. In this case, since the bottom surface of the capacitor does not interfere with the bottom surface of the case, the wiring board is not destroyed, and there is an effect that a highly reliable capacitor unit can be provided.

  According to the nineteenth aspect of the present invention, the capacitor is opened by an abnormal voltage or the like by setting the interval between the bottom surface of the capacitor and the bottom surface of the case to an interval at which the valve opening structure provided on the bottom surface of the capacitor is operable. When the valve is operated, the operation is enabled.

  In the invention according to claim 20 of the present invention, in the unlikely event that the valve opening structure of the capacitor is activated and the electrolytic solution leaks, an isolation wall is provided so that adjacent capacitors do not cause liquid conduction. As a result, even when the capacitor is opened, a serious defect can be prevented without causing a short circuit with the adjacent capacitor.

  In the invention according to claim 21 of the present invention, in the event that the valve opening structure of the capacitor is activated and the electrolyte leaks, an isolation wall is provided so as not to cause liquid conduction between series having a potential difference. Thus, even when the capacitor is opened, there is an effect that a serious defect can be prevented without short-circuiting the capacitor between series having a potential difference.

  According to a twenty-second aspect of the present invention, the case includes a lower case and an upper cover, and the lower case is provided with a restriction wall between the capacitor block and the control circuit unit, and these are relay connectors. By connecting the whole with an upper cover, the capacitor block and the control circuit unit are housed in a case, thereby improving the productivity and improving the reliability. Have.

  According to a twenty-third aspect of the present invention, a nut for fixing a screw for fixing a bracket for mounting to a fixed body is provided on a side surface of a case. When mounting to a plurality of vehicle types, a capacitor unit Can be dealt with by changing only the shape of the bracket in common, so that the capacitor unit can be standardized to reduce costs and stabilize quality.

  In the invention according to claim 24 of the present invention, the nut is press-fitted into a hole provided on the side surface of the case with a strength capable of withstanding the torque necessary for screw fixing, and the nut can be formed by a simple method. It has the effect of.

  According to a twenty-fifth aspect of the present invention, the nut is formed by insert molding on the side surface of the case with a strength capable of withstanding the torque necessary for screw fixing, and provides a fixing method with more stable quality. Has the effect of being able to

  In the invention according to claim 26 of the present invention, the mounting accuracy of the bracket can be improved by providing a position regulating guide for mounting the bracket in the vicinity of the nut portion on the side surface of the case. This has the effect of improving the mounting accuracy.

  The invention according to claim 27 of the present invention has a position restricting guide as a recessed hole, and shows a specific example of the position restricting guide.

  The invention described in claim 28 of the present invention is such that the position restricting guide is a convex boss, and similarly shows a specific invention example of the position restricting guide.

  According to a twenty-ninth aspect of the present invention, the lower case, the upper cover, and the holder are made of a glass-reinforced resin of a grade that hardly warps, and a plurality of capacitors and a control circuit unit are accommodated. It has the effect of being able to cope with the enlargement of the case, the required strength, and the stability of the shape.

  According to a thirty-third aspect of the present invention, the lower case and the upper cover are fixed by a snap fit portion formed of a claw portion and a lock portion formed by at least one molding, and at least one screw fastening. At the time of assembly, it can be fixed with a snap fit first, so that productivity can be stabilized, and after that, one or more screws are secured to prevent the upper cover from coming off. Therefore, it has the effect of improving productivity and reducing the number of screwing points.

  In order to charge and discharge the capacitor block, the capacitor block is formed by sandwiching a plurality of capacitor body parts into a holder and electrically connected in series or in parallel to a wiring board provided on the top of the capacitor. Is a capacitor unit comprising a control circuit unit constituting the charge / discharge circuit and a connector for electrically connecting them, and configured to charge / discharge the capacitor by a charge / discharge signal of an external load, and is connected in series or in parallel. The capacitor unit can be maintained with high reliability and the characteristics of the capacitor can be maximized by providing a charge / discharge circuit. Furthermore, stable control and deterioration of charge / discharge of the capacitor can be provided. It is configured in consideration of detection and assembly to vehicles, etc., and is highly reliable and easy to use It is possible to provide a capacitor unit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of an electronically controlled brake system for a vehicle according to an embodiment of the present invention. In FIG. 1, a battery 1 that supplies power, a capacitor unit 2 that serves as an emergency power supply, and an electronic control unit 3 that controls the electronically controlled brake system are electrically connected to each other. Further, the electronic control unit 3 is also connected to the brake pedal 4 and the hydraulic control unit 5. The hydraulic control unit 5 is connected to the brake 6 and the tire 7.

  In the electronically controlled brake system having such a configuration, when the power supply from the battery 1 is lost due to some unforeseen circumstances while operating, the function of the electronically controlled brake system is lost. If this happens during driving, the brake will not work and the vehicle cannot be braked. In order to prevent this, the capacitor unit 2 is connected, and when an unexpected situation occurs, the electric charge stored in the capacitor unit 2 is released by a command from the electronic control unit 3, and the vehicle is operated by operating the electronic control brake system. It is intended to brake.

  The present invention relates to the capacitor unit 2 and will be described next.

  FIG. 2 is an external perspective view of the capacitor unit 2.

  3, 4, and 5 are exploded perspective views of the capacitor unit 2.

  In each figure, 11 is a capacitor block, 12 is a control circuit unit, 13 is a connector that electrically connects the capacitor block 11 and the control circuit unit 12, and 14 is electrically connected to the electronic control unit 3 of the electronic control brake system. Input / output connector. Reference numeral 15 denotes a case for storing them, and includes a lower case 15a and an upper cover 15b.

  First, the configuration of the capacitor block 11 will be described.

  The capacitor 16 has lead wires 16a and 16b with + and-polarities extending in the same direction on the upper surface thereof. In the description of the present embodiment, 28 capacitors are configured in 4 series of 7 series. When the permissible voltage per capacitor 16 is 2V, 7 series are applied in order to be applied to a 14V system, and in order to secure the necessary charge amount, it is arranged in parallel to increase the charge amount. .

  The holder 17 stably holds the 28 capacitors 16 in 7 series × 4 parallel. At this time, the capacitor 16 is assembled by a jig or the like so that the height of the upper surface 16c from which the lead wires 16a and 16b extend is substantially uniform.

  A circuit pattern for connecting a plurality of capacitors 16 in 7 series × 4 parallel is formed on the wiring board 18. The holder 17 is provided with four height regulating bosses 17a, 17b, 17c, and 17d for keeping the height of the wiring board 18 constant. As a result, the positional relationship between the wiring board 18 and the upper surfaces 16c of the 28 capacitors 16 can be maintained substantially the same.

  Here, the height restricting bosses 17a to 17d of the holder 17 are formed with positioning projections 17e, 17f, 17g and 17h which are smaller than the diameter of the height restricting boss at the tip thereof, corresponding to that of the wiring board 18. It fits into holes 18a, 18b, 18c, 18d provided at the positions. Thereby, it is devised to maintain the positional relationship between the capacitor 16 and the wiring board 18 appropriately.

  Further, screw holes 17i, 17j, 17k, 17l for fixing with screws are formed concentrically on the positioning protrusions 17e to 17h of the holder 17. Here, the positioning protrusions 17 e to 17 h are formed with a height slightly smaller than the thickness of the wiring board 18. With this configuration, the holder 17 and the wiring board 18 can be stably fixed by fixing the wiring board 18 with screws after assembling.

  Further, the lead wires 16a and 16b of the capacitor 16 are bent at a substantially central position between the wiring board 18 and the lead wire 16a and 16b. Has been made substantially longer.

  Although the assembly procedure is not specifically described, the lead wires 16a and 16b of the 28 capacitors 16 are soldered to 56 soldering land portions 18e formed on the wiring board 18 in the state of being assembled in the above configuration. It is electrically connected by doing.

  With the above configuration, it is possible to securely hold the 28 capacitors 16 and to maintain a constant vertical and horizontal positional relationship with the wiring board 18, and to bend the lead wires 16a and 16b. Thus, the stress applied to the soldered portion can be made uniform and small. The environment of automobiles and the like is extremely severe, and vibration resistance and a wide operating temperature range are required. However, by taking the configuration as described above, it is possible to meet the required performance.

  Although not shown, the capacitor 16 is formed by winding a +,-electrode plate coated with activated carbon for a required length with a slip sheet called a separator sandwiched between the electrolyte and the outer case. ing. When an abnormal voltage or temperature is applied, gas is generated from the internal electrolyte and the internal pressure rises. If this exceeds the allowable value, it bursts (explodes) from the weakest part of the outer case or component pressure. Have the potential to The failure mode when an unexpected situation occurs in this state is difficult to predict.

  Here, in the present embodiment, as shown in FIG. 6, a slit 16g is formed in the bottom 16f of the outer case 16e made of aluminum or the like of the capacitor 16. The slit 16g is a groove having a depth of about ½ of the thickness of the outer case 16e, and is not a hole in the initial state.

  In this state, when the internal electrolyte expands due to abnormal voltage or the like and becomes a certain pressure or higher, the bottom 16f of the outer case 16e opens from the slit 16g as a starting point. As a result, the failure mode at the time of abnormality is fixed and destroyed on the safe side.

  Next, the capacitor 16 has lead wires 16a and 16b having + and-polarities, and the circuit pattern configuration of the wiring board 18 on which the lead wires 16a and 16b are mounted is the distance between adjacent lead wires. The short side is always the same potential (+ vs. + or-vs.-). This is to prevent a short-circuit between lead lands due to migration that occurs in a humidity environment or the like. Usually, when such treatment is not performed, it is necessary to cover the soldered portion with a moisture-proof coat or the like, but according to the present embodiment, there is an advantage that the moisture-proof coat is not required.

  FIG. 7 shows a pattern diagram of the wiring board 18. The wiring board 18 is connected to a resistor 19 for balancing so that the capacitors connected in series during charging are evenly charged. Since the allowable voltage of the capacitor 16 is as low as about 2V as described above, when the voltage applied to each capacitor 16 varies when charging with 14V, the performance of the capacitor 16 to which the high voltage is applied deteriorates quickly. Become. By connecting the voltage balancing resistor 19, the voltage applied to each capacitor 16 can be equalized, and an abnormal voltage can be prevented from being concentratedly applied to a small number of capacitors 16 to ensure stable long-term use. It will be possible.

  The wiring board 18 is provided with a test point 18 f for monitoring the voltage and characteristics (capacitance and resistance) for each parallel block of the capacitor 16. As a result, it is possible to confirm the characteristics at the stage of the capacitor block, and it is possible to initially grasp variations in voltage and capacitance. Further, although not shown in detail, the control circuit unit 12 also has a function of confirming the above-described characteristics, and when an abnormality occurs in the characteristic value due to the life or the like, electronic control is performed as a diagnostic signal from a built-in microcomputer. It is transmitted to the electronic control unit 3 of the brake system. Based on the result, measures such as lighting of the vehicle indicator and replacement of the capacitor unit 2 are performed.

  Next, a method of holding the capacitor 16 by the holder 17 of the capacitor block 11 will be described in detail with reference to FIGS.

  For example, when used in a vehicle or the like, large vibrations are applied due to engine vibrations or road conditions during travel. Therefore, a large toughness is required for vibration and impact. When the capacitor 16 vibrates up and down or left and right due to this vibration, a large load is applied to the soldering land portion 18e of the wiring board 18 and the reliability of the soldering portion may be reduced.

  Therefore, in the present embodiment, the capacitor 16 is fixed to the holder 17 so as not to vibrate up and down and left and right due to external vibration factors. Details will be described.

  FIG. 8 is a cross-sectional perspective view showing one place of 28 capacitor holding portions formed on the holder 17. The diameter of the storage cylinder 20 of the holder 17 into which the capacitor 16 is inserted is slightly larger than the diameter of the capacitor 16. Two or more ribs 21 are provided on the inner surface of the storage cylinder portion 20 in the vertical direction. Various shapes are possible, but a triangular or arcuate shape is desirable. The diameter connecting the apexes of the ribs 21 formed at two or more locations is set slightly smaller than the diameter of the capacitor 16. Therefore, when the capacitor 16 is inserted in this state, the capacitor 16 is press-fitted and held by elastic deformation of the housing cylinder portion 20 of the holder 17 and the exterior of the capacitor 16.

  The holding force at this time is set to 0.1 kgf to 10 kgf as a static load in the pulling direction of the capacitor 16. This determines the minimum holding force from the maximum acceleration resulting from the vibration conditions of the vehicle, the weight of the capacitor 16 and the allowable stress that does not cause the solder crack of the soldering portion 18e of the wiring board 18, and the deformation and internal destruction of the capacitor 16 are determined. The maximum holding force is determined from the allowable load.

  FIG. 9 is a view showing another method of holding the capacitor, and is a cross-sectional perspective view showing one place of 28 capacitor holding portions formed in the holder 17 as in FIG. On the side wall of the storage cylinder portion 20 of the capacitor 16, two holding claws 22 that are provided with slits 22 b on the left and right sides and can be elastically deformed are provided at diagonal positions. An arc-shaped holding portion 22 a is provided at the tip of the holding claw 22, and the diameter dimension connecting the two arc-shaped holding portions 22 a is set smaller than the diameter of the capacitor 16.

  When the capacitor 16 is inserted in this state, the capacitor 16 is held by the deflection of the holding claws 22 at two locations.

  The holding force at this time is set to 0.1 kgf to 10 kgf as a static load in the pulling direction of the capacitor 16 as in the case of rib press-fitting. The use of the holding claws 22 is the principle of a cantilever spring, and the holding force can be easily adjusted by adjusting the width and the length of the slit.

  In the case of rib press-fitting shown in FIG. 8, since the holding force depends on the elastic deformation of the cylindrical resin, the change in the holding force due to the dimensional change increases. Therefore, it is necessary to finish the dimensions with high accuracy. On the other hand, when the holding piece of FIG. 9 is used, since the fluctuation of the holding force due to the dimensional change can be suppressed as compared with FIG. 8, the dimensions are rough and a stable holding force can be obtained.

  Next, a method for housing the capacitor block 11 and the control circuit unit 12 obtained in the above configuration in the case 15 will be described in detail.

  Description will be made with reference to FIGS. 10 and 11 in addition to FIGS.

  FIG. 10 shows a cross-sectional view of the main part in a state of being housed in the case. The case 15 includes a lower case 15a and an upper cover 15b. The holder 17 of the capacitor block 11 is provided with two or more attachment portions 23 (six in this embodiment) on the outer periphery thereof. The lower case 15 a is provided with a fixing hole 24 at a position corresponding to the mounting portion 23. In this state, the holder 17 is inserted and fixed to the lower case 15a with screws.

  At this time, the capacitor 16 is sandwiched between the bottom portion 16f of the capacitor 16 and the bottom portion 25 of the lower case 15a so as to maintain a certain distance. One purpose of this is to prevent the bottom portion 16f of the capacitor 16 from interfering with the bottom portion of the lower case 15a so that no load is applied to the soldering land portion 18e of the wiring board 18. Another purpose is as follows. This is because the valve opening action of the slit 16g provided in the bottom portion 16f of the capacitor 16 is not hindered. Accordingly, the distance between the bottom portion 16f of the capacitor 16 and the bottom portion 25 of the lower case 15a is a dimension that takes into account the dimensional variation of the length of the capacitor 16 and the dimensional change when the slit 16g is opened.

  FIG. 11 is a cutaway perspective view of the main part showing the bottom 25 of the lower case 15a. In the position corresponding to the plurality of capacitors 16 of the capacitor block 11, the isolation wall 26 is latticed from the bottom 25 of the lower case 15a. It is provided in the shape. As a result, even if liquid leakage of the capacitor 16 occurs, it is possible to prevent liquid conduction with other capacitors 16 immediately, and during that time, it is possible to judge deterioration by the capacitor characteristic monitoring function and to perform diagnosis. Serious failure can be prevented in advance.

  Similarly, the isolation wall 27 provided in the lower case 15a shown in FIG. 3 is for preventing liquid conduction between a plurality of capacitors 16 in series, and the same effect can be obtained with this configuration. .

  Next, on the opposite side of the capacitor block 11 housed in the lower case 15a, a control circuit unit 12 is fixed by screws or the like, and the capacitor block 11 and the control circuit unit 12 housed in the lower case 15a. Between them, a regulating wall 28 having an appropriate height and thickness is provided. Further, the capacitor block 11 and the control circuit unit 12 are electrically connected by a connector 13.

  The capacitor block 11 is configured by connecting 28 capacitors 16 in series or in parallel. However, in order to maintain the performance, it is desirable that each characteristic is as uniform as possible. However, the control circuit unit 12 is a circuit that charges and discharges the capacitor block 11. In the process, the control circuit unit 12 generates considerable heat, and the radiant heat raises the temperature of the capacitor block 11 near the control circuit unit 12 to cause performance variation. There is a risk of generating. The restriction wall 28 prevents this radiant heat and maintains the quality of the capacitor block 11.

  Next, an embodiment for mounting the capacitor unit 2 on a vehicle will be described.

  A plurality of nuts 30 to be attached to the fixed body are formed on the side surface of the lower case 15a. This forming method is shown in FIG. A lower hole 29 for press-fitting a nut is formed in a side surface of the lower case 15a, and a nut 30 is press-fitted into the lower hole 29. The nut 30 has a knurled concavo-convex process on its outer periphery, and its diameter is slightly larger than the diameter of the pilot hole 29. The dimensional difference is defined from the required torque for fixing.

  FIG. 13 shows a method of forming the nut 31 by insert molding. The nut 31 is formed at the same time as the molding of the lower case 15a made of resin. The nut 31 has a concavo-convex shape on the outer peripheral knurl shape, and a circumferential groove is processed at a substantially central portion thereof. The processed part is filled with resin to ensure the tightening torque of the screw and the pull-out strength of the nut.

  FIG. 14 shows a position restricting guide hole 32 provided in the vicinity of a nut 30 or a nut 31 which is press-fitted or insert-molded. In the present embodiment, holes 32a, 32b, 32c of three position restriction guides are provided for the two nuts 30a, 30b. The bracket 33 is made of a metal plate or the like. The bracket 33 has two holes 34a and 34b for fixing screws and two positions 35a and 35b for positioning. In this state, the holes 32a and 32b of the position regulating guide are fitted into the positioning protrusions 35a and 35b, respectively, and the screw fixing holes 34a and 34b are inserted by the two bolts 36a and 36b and fixed to the nuts 30a and 30b. The A long hole 37 is formed at a required position in the bracket 33 and is fixed to a mounting portion of a vehicle or the like with a bolt (not shown).

  On the other hand, FIG. 15 shows a position regulating guide boss 38 provided in the vicinity of the nut 30 or the nut 31 which is press-fitted or insert-molded. In the present embodiment, the bosses 38a, 38b, 38c of the three position restriction guides are provided for the two nuts 30a, 30b. The bracket 33 is formed with two screw fixing holes 39a and 39b and positioning holes 40a and 40b. In this state, the bosses 38a, 38b, 38c of the position regulating guide and the positioning holes 40a, 40b, 40c are fitted, and the nuts are inserted through the screw fixing holes 39a, 39b by the two bolts 36a, 36b. It is fixed to 30a, 30b.

  Here, the hole 32c of the position restriction guide is not used in the example of FIG. 14, but when this is attached to various vehicles, various shapes of the bracket 33 are conceivable. It is formed to increase the design selectivity. Further, in the present embodiment, the configuration of only one surface of the lower case 15a is described, but these attachment portions may be configured on all surfaces including at least one surface and the top surface of the maximum upper cover 15b. .

  Next, assembly of the lower case 15a and the upper cover 15b will be described with reference to FIGS.

  Locking projections 41a and 41b are formed on the outer peripheral surface (desirably facing two surfaces) of the lower case 15a, and screw lower holes 43a and 43b are formed in the corner portion. The upper cover 15b is formed with elastic pieces 42a, 42b that can be fitted into the locking projections 41a, 41b and screw holes 44a, 44b facing the screw lower holes 43a, 43b. When the upper cover 15b is inserted into the lower case 15a in which the capacitor block 11 and the control circuit unit 12 are accommodated, the locking protrusions 41a and 41b and the elastic pieces 42a and 42b are fitted, and screws 45a and 45b are fitted. The screw holes 44a and 44b are inserted with (tapping screws) and fixed to the screw pilot holes 43a and 43b.

  By adopting the above configuration, it is possible to temporarily fix the screw before fixing, so that it is possible to inspect the characteristics in this state, and it is only necessary to fix the screw to a non-defective product after the inspection. If this is a configuration with only screws, if there is a problem and the upper cover 15b needs to be removed, the fixed screws 45a and 45b need to be removed again. At this time, since the screws 45a and 45b are of the type (tapping screws) that are directly screwed to the resin, if the screws 45 are screwed again, the screw fixing strength is deteriorated, and in some cases, it is necessary to replace the lower case 15a. There is a case.

  Further, if it is composed only of the elastic pieces 42a, 42b and the locking projections 41a, 41b, it can cope with disassembly at the time of trouble, but it is dropped as a product, mounted on the vehicle, in use, etc. If there is, there is a possibility that the upper cover 15b falls off. According to the present embodiment, there is rationality in the process, and the quality of the unit as a unit can be maintained and improved by minimizing the screwing portion.

  Next, although not shown, the lower case 15a, the upper cover 15b, and the holder 17 are resin parts, but it is necessary to stably hold a plurality of capacitors 16, and the capacitor block 11 and the control circuit. These parts are reinforced grades with glass fibers and sleds, assuming that the parts 12 etc. need to be stably stored in the case and are used in harsh environments. It is desirable to use a grade of resin material that does not easily cause

  The present invention provides a capacitor unit that can hold a plurality of capacitors connected in series or in parallel with high reliability and that can maximize the characteristics of the capacitor by providing a charge / discharge circuit. Suitable for use as a capacitor unit for auxiliary power supply in electronically controlled brake systems.

The block diagram of the electronic brake system of the vehicle in embodiment of this invention 1 is an external perspective view of a capacitor unit according to an embodiment of the present invention. An exploded perspective view of the main part of the capacitor unit The principal part perspective view of the same capacitor unit with the upper cover removed The principal part exploded perspective view of the capacitor block of the capacitor unit The perspective view of the capacitor of the same capacitor unit Diagram showing the wiring board of the capacitor unit Cross-sectional perspective view of the main part of the capacitor block holder Cross-sectional perspective view of the main part of the capacitor block holder Cross-sectional view of the main part of the capacitor unit Perspective view of main part of lower case of same capacitor unit Perspective view of main part of lower case of same capacitor unit Perspective view of main part of lower case of same capacitor unit The principal part perspective view which shows the relationship between the lower case and bracket of the capacitor unit The principal part perspective view which shows the relationship between the lower case and bracket of the capacitor unit

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery 2 Capacitor unit 3 Electronic control part 4 Brake pedal 5 Hydraulic control part 6 Brake 7 Tire 11 Capacitor block 12 Control circuit part 13 Connector 14 Input / output connector 15 Case 15a Lower case 15b Upper cover 16 Capacitors 16a and 16b Lead wire 17 Holder 17a, 17b, 17c, 17d Height restriction boss 18 Wiring board 19 Resistance 20 Storage cylinder part 21 Rib 22 Claw 22a Arc-shaped holding part 22b Slit 23 Attaching part 24 Fixing hole 25 Bottom part 26 Isolation wall 27 Isolation wall 28 Restriction wall 29 Pilot hole 30 Nut 31 Nut 32 Position restriction guide hole 33 Bracket 34a, 34b Screw fixing hole 35a, 35b Raised 36a, 36b Bolt 37 Long hole 38a, 38b, 38c Position restriction guide bolt 39a, 39b threaded fixing holes 40a, 40b, 40c holes 41a for positioning, projections 42a for 41b locking, 42b elastic pieces 43a, 43b under the screw holes 44a, 44b threaded holes 45a, 45b threaded

Claims (30)

A capacitor block formed by sandwiching a plurality of capacitor body parts into a holder and electrically connected in series or in parallel to a wiring board provided above the capacitor, and charging / discharging for charging / discharging the capacitor block A capacitor unit comprising a control circuit unit constituting a discharge circuit and a connector for electrically connecting them, and charging and discharging the capacitor by a charge / discharge signal of an external load. The capacitor unit according to claim 1, wherein the control circuit unit includes an input / output connector electrically connected to an external load, and is integrally housed in a case together with the capacitor block. 2. The capacitor unit according to claim 1, wherein the plurality of capacitors have two-pole electrodes composed of lead wires extending in the same direction, and are mounted on a wiring board on which a circuit pattern for connecting them in series or in parallel is formed. . 2. The capacitor unit according to claim 1, wherein a plurality of height restricting bosses are provided on the upper surface of the holder so that a constant distance is maintained between the upper surface of the capacitor and the wiring board. 5. The capacitor according to claim 4, wherein at least two of the height restriction bosses have wiring board positioning protrusions, and the wiring board has holes corresponding to the protrusions, each having a position restriction function. unit. At least two of the height regulating bosses have screw holes for fixing the wiring board. By fixing the wiring board with screws, the holder and the wiring board are fixed at a certain height. The capacitor unit according to claim 4. 5. The capacitor unit according to claim 4, wherein the height restricting boss is provided with a positioning projection and a screw hole concentrically, and the positioning projection is set lower than a thickness of the wiring board. The lead wire extending in the same direction from the capacitor is bent so that the length from the outlet of the capacitor to the fixing portion of the wiring board becomes substantially longer at the intermediate portion soldered and fixed to the wiring board. The capacitor unit according to claim 3. The capacitor unit according to claim 1, wherein the capacitor has a valve-opening structure that discharges the electrolytic solution at the bottom. The capacitor unit according to claim 1, wherein the plurality of capacitors connected in series or in parallel to the wiring board are arranged so that lead lands of adjacent capacitors on the wiring board have the same potential. 2. The capacitor unit according to claim 1, wherein a resistance for a balance voltage corresponding to the series number of a plurality of capacitors connected in series or in parallel is mounted on the wiring board in parallel with the capacitor. 2. The capacitor unit according to claim 1, wherein the wiring board has test points for monitoring the voltage and characteristics of each parallel block of the capacitor. The capacitor unit according to claim 1, wherein the control circuit unit has a function of monitoring a voltage and characteristics of series connection or parallel connection of capacitor blocks. 2. The capacitor unit according to claim 1, wherein the holder is provided with a plurality of storage cylinder portions to sandwich and hold the plurality of capacitor body portions, and the capacitor is fixed so as not to move up and down and left and right due to an external vibration factor. . 15. The capacitor unit according to claim 14, wherein an inner diameter of the storage cylinder portion of the holder is slightly larger than an outer diameter of the capacitor, and the capacitor is press-fitted and held by two or more ribs provided on the inner surface thereof. . The inner cylinder of the holder is slightly larger than the outer diameter of the capacitor, and the capacitor is held by an elastic piece composed of two or more slits and holding claws provided on the inner surface. The capacitor unit according to claim 14. The capacitor unit according to claim 14, wherein the capacitor is held in the holder in a range of 0.1 kgf to 10 kgf as a holding force in the pulling direction of the capacitor. The capacitor block is mounted at a mounting position in the case through a plurality of mounting portions provided on the outer periphery of the holder, and the bottom surface of the capacitor incorporated in the holder is configured to maintain a certain distance from the bottom surface of the case. The capacitor unit according to claim 2. 19. The capacitor unit according to claim 18, wherein an interval between the bottom surface of the capacitor and the bottom surface of the case is set to an interval at which a valve opening structure provided on the bottom surface of the capacitor can be operated. 3. The capacitor unit according to claim 2, wherein an isolation wall is provided on the bottom surface of the case so that adjacent capacitors do not cause liquid conduction when the valve opening structure of the capacitor is activated and the electrolyte leaks. 3. The capacitor unit according to claim 2, wherein an isolation wall is provided on the bottom surface of the case so as not to cause liquid conduction between series having a potential difference when the valve opening structure of the capacitor is activated and the electrolyte leaks. The case is composed of a lower case and an upper cover, and the lower case is provided with a regulating wall between the capacitor block and the control circuit unit, and these are electrically connected by a relay connector, and the whole is covered by the upper cover. The capacitor unit according to claim 2, wherein the capacitor unit is covered. The capacitor unit according to claim 2, wherein a screw fixing nut for fixing a bracket to be attached to a fixed body is provided on a side surface of the case. 23. The capacitor unit according to claim 22, wherein the nut is press-fitted into a hole provided on a side surface of the case with a strength sufficient to withstand a torque necessary for fixing the screw. 23. The capacitor unit according to claim 22, wherein the nut is formed by insert molding on a side surface of the case with a strength capable of withstanding a torque necessary for fixing the screw. The capacitor unit according to claim 22, wherein a position regulating guide for mounting the bracket is provided in the vicinity of the nut portion on the side surface of the case. 26. The capacitor unit according to claim 25, wherein the position regulating guide comprises a recessed hole. 26. The capacitor unit according to claim 25, wherein the position regulating guide comprises a convex boss. 23. The capacitor unit according to claim 22, wherein the lower case, the upper cover, and the holder are made of a glass-reinforced resin grade resin that hardly warps. 23. The capacitor unit according to claim 22, wherein the lower case and the upper cover are fixed to each other by a snap fit portion formed by a claw portion formed by molding at least one location and a lock portion and at least one screw fastening. .

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