JP5652082B2 - Electrolytic capacitor with temperature sensor - Google Patents

Description

  The present invention relates to an electrolytic capacitor with a temperature sensor that can measure its own temperature and prevent ignition and the like.

Electrolytic capacitors such as aluminum electrolytic capacitors are subject to deterioration of characteristics due to overvoltage and other loads exceeding the rated voltage, causing rapid heat generation and gas generation. Has been.
Conventionally, a method of measuring and controlling the temperature of an electrolytic capacitor by attaching a temperature sensor to the electrolytic capacitor is known.

  For example, Patent Document 1 proposes a temperature detection structure in which a temperature sensor wound with an insulating tape is placed in close contact with an electrolytic capacitor with a heat shrinkable tube. In this temperature detection device, a thermistor mounted on a small sensor substrate is used as a temperature sensor, and this temperature sensor is fixed to the side surface of the electrolytic capacitor by contraction of a heat shrinkable tube.

JP 2003-243269 A

The following problems remain in the conventional technology.
That is, in the technique described in Patent Document 1, the temperature sensor is disposed in close contact with the side surface of the electrolytic capacitor. In this case, the temperature of the electrolytic capacitor is only measured partially. The whole cannot be measured. Even if the temperature inside the tube is equalized to some extent by the heat conduction of the heat-shrinkable tube, the temperature sensor is locally fixed to the side surface of the electrolytic capacitor, and the area where the temperature sensor is closely attached is small. Due to the large heat capacity, it is difficult to measure an accurate temperature and the response is low. In addition, the temperature sensor alone is likely to fluctuate rapidly due to outside air etc., and the temperature sensor fixed to the side surface makes the overall shape of the electrolytic capacitor uneven, making it difficult to install and store, and difficult to downsize. Become. In addition, since the temperature sensor is fixed with a heat-shrinkable tube, it is difficult to dissipate the heat of the electrolytic capacitor, the heat tends to be trapped and the safety is lowered, and the responsiveness of the temperature sensor to the rapid temperature change of the electrolytic capacitor There was a problem that became slow.

  The present invention has been made in view of the above-described problems, and is an electrolytic capacitor with a temperature sensor that can accurately measure the temperature of the entire electrolytic capacitor, has excellent responsiveness, and suppresses unevenness of the outer shape as much as possible and is easy to install and store. The purpose is to provide.

The present invention employs the following configuration in order to solve the above problems. That is, the electrolytic capacitor with a temperature sensor of the present invention is provided so as to cover the outer periphery of the electrolytic capacitor main body and the electrolytic capacitor main body, and extends in the circumferential direction of the outer peripheral to change the electric resistance according to the temperature. And a film-like temperature sensor having a heat sensitive part.
In this electrolytic capacitor with a temperature sensor, a film-like temperature sensor having a heat-sensitive portion that is provided so as to cover the outer periphery of the electrolytic capacitor body and that extends in the circumferential direction of the outer periphery and changes its electrical resistance in accordance with the temperature. Since it is provided, the temperature can be measured over a wide area on the outer periphery of the electrolytic capacitor main body, and the temperature of the entire electrolytic capacitor can be measured more accurately than a conventional device in which a temperature sensor is closely adhered and fixed locally. Further, the temperature of the film-like temperature sensor fluctuates in a place where the outside air wind is received, but the influence is reduced because the average temperature on the wide outer peripheral surface of the covered electrolytic capacitor body is measured. Furthermore, since the outer periphery of the electrolytic capacitor body is covered with a flexible and thin film-like temperature sensor, the outer shape is less likely to have irregularities and has a small heat capacity. For this reason, the responsiveness of temperature measurement is high, it is easy to miniaturize, and it is easy to secure a place for installation and storage.

Moreover, the electrolytic capacitor with a temperature sensor of the present invention is characterized in that the heat-sensitive portion extends over the entire circumference of the electrolytic capacitor body.
That is, in this electrolytic capacitor with a temperature sensor, since the heat sensitive part extends over the entire circumference of the electrolytic capacitor body, the average temperature in the entire circumference of the electrolytic capacitor body can be measured, and the electrolytic capacitor can be measured with higher accuracy. The average temperature of the capacitor body can be measured.

Further, in the electrolytic capacitor with a temperature sensor of the present invention, the film-shaped temperature sensor includes an insulating film, the thin-film heat-sensitive portion formed on the insulating film and extending in the circumferential direction of the outer periphery, And a pair of lead wires connected to the heat sensitive part.
That is, in this electrolytic capacitor with a temperature sensor, the film-like temperature sensor has the thin film-like heat-sensitive portion formed on the insulating film and extending in the circumferential direction of the outer periphery. The film-like temperature sensor can be adhered to the outer periphery easily and in a high contact state, and temperature measurement with high accuracy and high response becomes possible.

Furthermore, in the electrolytic capacitor with a temperature sensor according to the present invention, the heat sensitive part is formed on the insulating film, the pair of pattern electrodes to which the pair of lead wires are connected, the insulating film, and the pair of patterns. And a thin film thermistor portion patterned on the electrode.
That is, in this electrolytic capacitor with a temperature sensor, the heat sensitive part has a thin film thermistor part patterned on the insulating film, so that a wide area of the electrolytic capacitor body is covered with a thin film thermistor part of a wide area, More accurate and responsive temperature measurement becomes possible.

Moreover, the electrolytic capacitor with a temperature sensor of the present invention is characterized in that the heat sensitive part is a platinum resistance thermometer formed by patterning a platinum film on the insulating film.
That is, in this electrolytic capacitor with a temperature sensor, since the heat sensitive part is a platinum resistance thermometer that is patterned with a platinum film on an insulating film, the platinum resistance thermometer extending over a wide range of outer periphery of the electrolytic capacitor body. The body enables temperature measurement with higher accuracy and higher response.

The present invention has the following effects.
That is, according to the electrolytic capacitor with a temperature sensor according to the present invention, the heat-sensitive part that is provided so as to cover the outer periphery of the electrolytic capacitor body and extends in the circumferential direction of the outer periphery and changes in electric resistance according to temperature. Since the film-like temperature sensor is provided, the temperature of the entire electrolytic capacitor can be accurately measured, and the response is excellent, and the outer shape unevenness is suppressed as much as possible, and installation and storage are facilitated. Therefore, the temperature of the electrolytic capacitor body can be measured with high accuracy and high responsiveness, and the occurrence of ignition or the like can be prevented in advance.

1 is a perspective view showing a first embodiment of an electrolytic capacitor with a temperature sensor according to the present invention. In 1st Embodiment, it is a perspective view which shows a film-like temperature sensor. In 1st Embodiment, it is a perspective view which shows the manufacturing method of a film-form temperature sensor in order of a process. In 1st Embodiment, it is a perspective view which shows the fixing method of the film-form temperature sensor to the electrolytic capacitor main body in order of a process. In 2nd Embodiment of the electrolytic capacitor with a temperature sensor which concerns on this invention, it is a perspective view which shows a film-form temperature sensor. In 2nd Embodiment, it is a perspective view which shows the manufacturing method of a film-form temperature sensor in order of a process.

  Hereinafter, a first embodiment of an electrolytic capacitor with a temperature sensor according to the present invention will be described with reference to FIGS. In each drawing used for the following description, the scale is appropriately changed in order to make each member recognizable or easily recognizable.

As shown in FIGS. 1 and 2, the electrolytic capacitor 1 with a temperature sensor of the present embodiment is provided so as to cover a columnar electrolytic capacitor body 2 and an outer periphery of the electrolytic capacitor body 2, and the periphery of the outer periphery. And a film-like temperature sensor 4 having a heat-sensitive part 3 that extends in the direction and changes its electrical resistance in accordance with the temperature.
The film-like temperature sensor 4 includes an insulating film 5, a thin-film heat-sensitive part 3 formed on the insulating film 5 and extending in the circumferential direction of the outer periphery, and a pair connected to the heat-sensitive part 3. Lead wire 6.

The heat sensitive part 3 extends over the entire circumference of the electrolytic capacitor body 2.
As shown in FIG. 2, the heat sensitive part 3 is formed on a pair of pattern electrodes 7 formed on an insulating film 5 and connected to a pair of lead wires 6, and on the insulating film 5 and the pair of pattern electrodes 7. And a patterned thin film thermistor section 8.

The electrolytic capacitor body 2 is, for example, an aluminum electrolytic capacitor. The electrolytic capacitor main body 2 is provided with a pair of lead terminals 9 as lead wires protruding downward in the axial direction.
The insulating film 5 is, for example, a polyimide resin sheet and is formed in a strip shape with a length equal to or longer than the entire circumference of the electrolytic capacitor body 2.
The pair of pattern electrodes 7 is formed by patterning a laminated metal film of, for example, a NiCr film and a Pt film, and has comb-shaped electrode portions having a comb-shaped pattern arranged in an opposed state. The comb-shaped electrode portions of these pattern electrodes 7 are arranged so as to extend along the extending direction of the strip-shaped insulating film 5 (winding direction around the electrolytic capacitor body 2). Further, a plating part 10 is formed on the base end part of the pair of pattern electrodes 7 as a lead part of the lead wire 6. Furthermore, one end of the lead wire 6 is joined to the plated portion 10 with a solder material 11.

  The thin film thermistor portion 8 is made of a thin film thermistor material made of a nitride such as TiAlN, TiN, NbAlN, NbN, etc. Is formed.

Next, the manufacturing method of the electrolytic capacitor 1 with a temperature sensor of this embodiment is demonstrated with reference to FIGS.
First, for example, a NiCr film (Ni: Cr = 80 mol%: 20 mol%) is formed to a thickness of 10 nm on the insulating film 5 of a polyimide resin sheet having a thickness of 50 μm shown in FIG. Further, a Pt film having a thickness of 200 nm is formed thereon.

  Next, as shown in FIG. 3B, a resist solution is applied onto the stacked NiCr film and Pt film with a bar coater, pre-baked at 80 ° C. for 10 minutes, and then a predetermined comb electrode is formed with an exposure apparatus. It is exposed to the pattern shape of the structure, and unnecessary portions are removed. Further, the pair of pattern electrodes 7 is patterned in a predetermined pattern by dry etching with Ar.

On the insulating film 5 on which the pattern electrode 7 is formed, as shown in FIG. 3C, a TiAlN thin film thermistor portion 8 having a predetermined shape and a thickness of 500 nm is formed by reactive sputtering through a metal mask. Film.
Thereafter, as shown in FIG. 3 (d), a polyimide coverlay film 12 with an adhesive is placed on the insulating film 5 so as to cover the thin film thermistor portion 8, and 2N / cm at 150 ° C. by a press machine. Pressurize with pressure for 30 min to adhere. At this time, the polyimide cover lay film 12 is bonded except for the base end portions of the pair of pattern electrodes 7 forming the plating portion 10.

Next, as shown in FIG. 3E, a Ni plating layer having a thickness of 3 μm and a Sn plating layer having a thickness of 10 μm are formed on the base end portions of the pair of pattern electrodes 7 by a plating solution. The plating part 10 is used.
Furthermore, the film-like temperature sensor 4 shown in FIG. 2 is produced by joining one end of each lead wire 6 to the plated portion 10 with the solder material 11.

Next, a film with a double-sided adhesive (not shown) is wound around the outer periphery of the electrolytic capacitor main body 2 shown in FIG. 4A, and the film-like temperature sensor 4 is placed on the film with the double-sided adhesive, as shown in FIG. As shown in FIG. 3, the outer periphery of the electrolytic capacitor body 2 is wrapped and bonded so as to cover the outer periphery. At this time, the film-like temperature sensor 4 is bonded so that the heat-sensitive part 3 makes one round of the outer peripheral surface of the electrolytic capacitor body 2.
Further, as shown in FIG. 4C, the outer circumference of the electrolytic capacitor body 2 is wrapped so as to cover the insulating film 5 of the film-like temperature sensor 4 with the insulating tape 13, whereby the temperature sensor of the present embodiment. The attached electrolytic capacitor 1 is produced.

As described above, in the electrolytic capacitor 1 with the temperature sensor of the present embodiment, the thermosensitive part is provided so as to cover the outer periphery of the electrolytic capacitor main body 2 and extends in the circumferential direction of the outer periphery to change the electric resistance according to the temperature. 3 is provided so that the temperature can be measured in a wide area on the outer periphery of the electrolytic capacitor body 2 and compared to the conventional locally fixed temperature sensor. 2 The temperature of the whole can be measured accurately.
In particular, by extending the heat sensitive part 3 over the entire circumference of the electrolytic capacitor body 2, the average temperature of the entire circumference of the electrolytic capacitor body 2 can be measured, and the average temperature of the electrolytic capacitor body can be measured with higher accuracy. can do.

  Further, the temperature of the film-like temperature sensor 4 fluctuates in a place where the outside air wind is received, but the influence is reduced because the average temperature on the wide outer peripheral surface of the covered electrolytic capacitor body 2 is measured. Furthermore, since the outer periphery of the electrolytic capacitor body 2 is covered with the flexible and thin film-like temperature sensor 4, unevenness is hardly generated on the outer shape and the heat capacity is small. For this reason, the responsiveness of temperature measurement is high, it is easy to miniaturize, and it is easy to secure a place for installation and storage.

  Moreover, since the film-like temperature sensor 4 has the thin film-like heat-sensitive part 3 formed on the insulating film 5 and extending in the circumferential direction of the outer circumference, the film-like temperature sensor 4 can be easily placed on the outer circumference of the electrolytic capacitor body 2 with high flexibility. The film-like temperature sensor 4 can be adhered in a high contact state, and temperature measurement with high accuracy and high response becomes possible. In particular, since the heat sensitive part 3 includes the thin film thermistor part 8 patterned on the insulating film 5, the wide outer periphery of the electrolytic capacitor body 2 is covered with the thin film thermistor part 8 having a large area, so that the accuracy is high. In addition, highly responsive temperature measurement is possible.

  Next, 2nd Embodiment of the electrolytic capacitor with a temperature sensor which concerns on this invention is described below with reference to FIG. 5 and FIG. Note that, in the following description of the embodiment, the same components described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

The difference between the second embodiment and the first embodiment is that, in the first embodiment, the heat sensitive part 3 is a thin film thermistor provided with a thin film thermistor part 8, whereas the electrolytic capacitor with a temperature sensor of the second embodiment. As shown in FIG. 5, the heat-sensitive part 23 is a platinum resistance thermometer 28 that is patterned in a meander-shaped linear pattern with a Pt (platinum) film on the insulating film 5.
That is, in the film-like temperature sensor 24 of the second embodiment, the Pt film formed on the insulating film 5 is patterned in a meander shape so that the platinum resistance thermometer 28 is in the circumferential direction of the outer periphery of the electrolytic capacitor body 2. It is provided over.

Next, the manufacturing method of the electrolytic capacitor with a temperature sensor of 2nd Embodiment is demonstrated with reference to FIG. 5 and FIG.
First, as shown in FIG. 6A, a NiCr film (Ni: Cr = 80 mol%: 20 mol%) is formed to a thickness of 10 nm on the insulating film 5 of a polyimide resin sheet having a thickness of 50 μm, for example, by sputtering. Further, a Pt film having a thickness of 200 nm is formed thereon.

  Next, as shown in FIG. 6B, a resist solution is applied on the stacked NiCr film and Pt film with a bar coater, pre-baked at 80 ° C. for 10 minutes, and then a predetermined meander structure is formed with an exposure apparatus. The pattern is exposed to light, and unnecessary portions are removed. Further, the platinum resistance thermometer 28 is patterned in a predetermined pattern by dry etching with Ar.

  Thereafter, as shown in FIG. 6 (c), a polyimide coverlay film 12 with an adhesive is placed on the insulating film 5 so as to cover the platinum resistance thermometer 28, and 2N / Pressurize with a pressure of cm for 30 minutes to adhere. The polyimide cover lay film 12 is bonded except for the pair of base end portions of the platinum resistance thermometer 28 where the plated portion 10 is formed.

Next, as shown in FIG. 6D, a Ni plating layer having a thickness of 3 μm and a Sn plating layer having a thickness of 10 μm are formed on the pair of base end portions of the platinum resistance thermometer 28 by a plating solution. A pair of plating portions 10 is used.
Furthermore, the film-like temperature sensor 24 shown in FIG. 5 is produced by joining one end of each lead wire 6 to the plated portion 10 with the solder material 11.

  Next, similarly to the first embodiment, a film with a double-sided adhesive (not shown) is wound around the outer periphery of the electrolytic capacitor body 2, and the film-like temperature sensor 24 is electrolyzed on the film with a double-sided adhesive (not shown). The capacitor body 2 is adhered so as to cover the outer periphery. At this time, the film-like temperature sensor 24 is bonded so that the heat-sensitive part 23 makes one round of the outer peripheral surface of the electrolytic capacitor body 2. Furthermore, by wrapping the outer periphery of the electrolytic capacitor main body 2 so as to cover the insulating film 5 of the film-like temperature sensor 24 with the insulating tape 13, the electrolytic capacitor with a temperature sensor of the second embodiment is manufactured.

  Thus, in the electrolytic capacitor with a temperature sensor of the second embodiment, since the heat sensitive part 23 is the platinum resistance thermometer 28 patterned with the Pt film on the insulating film 5, a wide range of the electrolytic capacitor main body 2 can be obtained. The platinum resistance thermometer 28 extending over the outer periphery enables temperature measurement with higher accuracy and higher response.

  The technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Electrolytic capacitor with temperature sensor, 2 ... Electrolytic capacitor body, 3, 23 ... Heat sensitive part, 4, 24 ... Film temperature sensor, 5 ... Insulating film, 6 ... Lead wire, 7 ... Pattern electrode, 8 ... Thin film thermistor 28, platinum resistance thermometer

Claims (4)

Electrolytic capacitor body,
A film-like temperature sensor that is provided so as to cover the outer periphery of the electrolytic capacitor body and has a heat-sensitive portion that extends in the circumferential direction of the outer periphery and changes its electrical resistance in accordance with the temperature;
The temperature characterized in that the film-like temperature sensor is wound around and adhered to the outer periphery of the electrolytic capacitor main body to be in close contact with the entire circumference, and the heat sensitive portion extends over the entire circumference of the electrolytic capacitor main body. Electrolytic capacitor with sensor. The electrolytic capacitor with a temperature sensor according to claim 1,
The film temperature sensor is an insulating film,
The thin film-shaped heat-sensitive part formed on the insulating film and extending in the circumferential direction of the outer periphery;
An electrolytic capacitor with a temperature sensor, comprising: a pair of lead wires connected to the heat sensitive part. The electrolytic capacitor with a temperature sensor according to claim 2,
A pair of pattern electrodes formed on the insulating film and connected to the pair of lead wires;
An electrolytic capacitor with a temperature sensor, comprising: a thin film thermistor portion patterned on the insulating film and the pair of pattern electrodes. The electrolytic capacitor with a temperature sensor according to claim 2,
The temperature-sensing electrolytic capacitor, wherein the heat-sensitive part is a platinum resistance thermometer that is patterned with a platinum film on the insulating film.

Images