JP6963810B2 - Temperature detector - Google Patents

Description

In the present invention, the temperature measuring element is fixed to the surface of the heat receiving substrate via a conductive pattern, the uncoated end portion of the pair of lead wires is fixed, and at least the uncoated end portion of the temperature measuring element and the pair of lead wires is fixed. It relates to a temperature detector whose part is potted with resin.

As a temperature detector for detecting the temperature of a predetermined portion, for example, the temperature of the upper surface of a power storage device containing a large number of power storage elements, Patent Document 1 below describes the heat receiving substrate and the surface of the heat receiving substrate. A conductive pattern having a pair of connection areas for connecting each of the temperature measuring element fixing area, the pair of lead wire fixing areas, and the pair of lead wire fixing areas to the temperature measuring element fixing area, and the conductive pattern fixed to the temperature measuring element fixing area. A pair of lead wires with uncoated ends fixed to each of the temperature measuring element and the pair of lead wire fixing areas, and a part of the uncoated end and covering of the temperature measuring element and the pair of lead wires. A temperature detector containing a potting resin covering the above has been proposed.

Japanese Unexamined Patent Publication No. 2015-69738

Thus, in the conventional temperature detector as described above, (1) a resin in a state in which a part of the lead wire covered with the uncoated end portion extends along the surface of the heat receiving substrate. In general, due to the coating of a pair of lead wires whose so-called resin wetting is not good, resin potting cannot be performed as required and gaps tend to be generated, and the insulation reliability is not always sufficient. No, (2) Resin to be filled because the resin is potted on the exposed heat receiving substrate, temperature measuring element, and the uncoated end and part of the coated part of the pair of lead wires. If the viscosity is relatively low, for example, the resin tends to flow forward from the surface of the heat receiving substrate, and if the resin to be filled has a relatively high viscosity, it is difficult to form the potting resin in the required form. be.

The present invention has been made in view of the above facts, and its main technical problem is that the resin can be sufficiently and easily filled in a required form without gaps, and sufficient insulation reliability can be obtained. To provide a new and improved temperature detector.

As a result of diligent studies and experiments, the present inventors have arranged a synthetic resin case having a front wall and both side walls and having an opening on the bottom surface on which a heat receiving substrate is mounted. The back surface is exposed from the opening of the case and the temperature measuring element fixing area is positioned on the front wall side of the case and press-fitted into the opening of the case, and the potting resin is fixed to the pair of lead wire fixing areas of the pair of lead wires. It is formed by filling and curing resin between the front wall and both side walls of the case, and the heat receiving substrate is bonded to the case with potting resin. It has been found that the detector can achieve the above-mentioned main technical problems.

That is, according to the present invention, as a temperature detector that achieves the above-mentioned main technical problem,
A pair of connection areas arranged on the surface of the heat receiving substrate and connecting each of the temperature measuring element fixing area, the pair of lead wire fixing areas, and the pair of lead wire fixing areas to the temperature measuring element fixing area. A conductive pattern having a A temperature detector containing the temperature measuring element and a potting resin covering at least the uncoated end of the pair of lead wires.
It has a front wall and both side walls, and a bottom surface is provided with a synthetic resin case in which an opening for mounting the heat receiving substrate is defined.
The heat receiving substrate is press-fitted into the opening of the case with its back surface exposed from the opening and the temperature measuring element fixing region located on the front wall side.
The potting resin causes the pair of lead wires to stand up from the heat receiving substrate except for the uncoated end portions fixed to the pair of lead wire fixing regions, and is used between the front wall and both side walls of the case. is formed by the resin filled cured,
The heat receiving substrate is adhered to the case by the potting resin .
A temperature detector is provided which is characterized in that.

The case has a rear wall, and it is desirable that the front wall, the side walls and the rear wall define a main part having a rectangular tubular shape. Each of the side walls of the case is integrally provided with a laterally extending wall, and each of the extending walls is equipped with a metal spring piece having a free end for applying a pressing force. It is preferable to have. The spring piece has a mounting portion extending flatly and a functional portion extending in an arc shape from the front end of the mounting portion upward and rearward to the pressing force application end, and the mounting portion is formed on the extending wall. It is preferably mounted on the upper surface. A locking piece located above the front end of the extending wall is integrally attached to each of the both side walls of the case, and a locking protrusion is provided on the upper rear end of each of the extending walls. The strips are integrally formed, and a locked hole corresponding to the locking ridge is formed in the mounting portion of the spring piece, and the spring piece is engaged with the locking ridge. The extension is made by fitting a stop hole and extending the mounting portion forward from the rear end of the upper surface of the extension wall and passing between the extension wall and the locking piece. It is desirable that it is mounted on the wall. It is convenient for the locking ridge to have a steep rear surface and an inclined front surface that slopes downward toward the front.

In the temperature detector of the present invention, the potting resin makes the front wall and both sides of the case stand up from the heat receiving substrate except for the uncoated ends of the pair of lead wires fixed to the pair of lead wire fixing regions. Since it is formed by filling and curing the resin between the walls, the entire uncoated portion of the pair of leads can be resin potted without gaps without being hindered by the coating of the pair of leads, and also Since the space surrounded by the front wall and both side walls of the case is filled with resin, even a resin with relatively low viscosity can be filled sufficiently easily into the required shape, and thus the potting resin having the required shape without gaps can be obtained. It can be formed to achieve highly reliable insulation. In addition, the potting resin can bond the heat-receiving substrate to the bottom wall of the case, ensuring that the heat-receiving substrate does not fall out of the case even when the heat-receiving substrate is simply press-fitted into place in the case. can do.

The slope view which shows the preferable embodiment of the temperature detector configured according to this invention. The slope view which shows the heat receiving substrate, the conductive pattern, the temperature measuring element and the lead wire in the temperature detector shown in FIG. A slope portion showing a synthetic resin case in the temperature detector shown in FIG. The slope view which shows the metal spring piece in the temperature detector shown in FIG. FIG. 5 is a cross-sectional view showing the temperature detector shown in FIG. The slope view which shows an example of the use state of the temperature detector shown in FIG. The front view which shows an example of the use state of the temperature detector shown in FIG.

Hereinafter, description will be made in more detail with reference to the accompanying drawings illustrating preferred embodiments of the temperature detector configured according to the present invention.

Explaining with reference to FIG. 2 together with FIG. 1, the temperature detector indicated by No. 2 as a whole includes a heat receiving substrate 4 having a rectangular plate shape. The heat receiving substrate 4 is composed of a main body 6 and an insulating layer 8 provided on the surface of the main body 6. The main body 6 can be formed from an appropriate metal having a high thermal conductivity such as aluminum, copper or magnesium, oxides or nitrides thereof, or a ceramic obtained by kneading and baking these. The insulating layer 8 can be formed of, for example, a resin such as epoxy, polyamide or polyimide, or a resin to which an appropriate filler is added. On the insulating layer 8 provided on the surface of the heat receiving substrate 4, a conductive pattern 10 which is conveniently formed of copper foil is arranged. The conductive pattern 10 has a pair of connection areas 10c for connecting each of the temperature measuring element fixing area 10a, the pair of lead wire fixing areas 10b, and the pair of lead wire fixing areas 10b to the temperature measuring element fixing area 10a.

A temperature measuring element 12 that can be composed of a thermistor is fixed by soldering on the temperature measuring element fixing region 10a of the conductive pattern 10. Further, each of the uncoated end portions 14a of the pair of lead wires 14 is fixed to each of the pair of lead wire fixing regions 10b of the conductive pattern 10 by soldering. As will be described in more detail later, the potting resin is formed by raising the portion of the pair of lead wires 14 other than the uncoated end portion 14a fixed to the lead wire fixing region 10b of the conductive pattern 10 from the heat receiving substrate 4. Therefore, the portion of the pair of lead wires 14 other than the uncoated end portion 14a is maintained in a state of rising from the heat receiving substrate 4, and therefore, also in FIG. 2, the portion of the pair of lead wires 14 other than the uncoated end portion 14a. Is shown in a state of being raised from the heat receiving substrate 4.

It is important that the temperature detector 2 configured according to the present invention is provided with the synthetic resin case 16. Continuing the description with reference to FIGS. 3 to 5 together with FIG. 1, the illustrated case 16 which can be integrally injection-molded from an appropriate synthetic resin such as PBT, PET or POM has a front wall 18a and both side walls. It has a rectangular tubular main portion 18 as a whole composed of 18b and 18c and a rear wall 18d. If desired, the rear wall 18d can be omitted. An opening 20 on which the heat receiving substrate 4 is mounted is defined on the lower surface of the main portion 18. As is clearly understood by referring to FIG. 5, recesses extending continuously in the circumferential direction are formed in the lower end of the inner surface of the front wall 18a, the side walls 18b and 18c, and the rear wall 18d. The recess 20 defines the opening 20. The outer diameter dimension of the opening 20 corresponds to the outer diameter dimension of the heat receiving substrate 4, and more specifically, it is slightly smaller than the outer diameter dimension of the heat receiving substrate 4.

On the outer surfaces of both side walls 18b and 18c of the case 16, an extension wall 22 extending laterally is integrally attached, and a locking piece located above the front end portion of the extension wall 22 is also provided. 24 are integrally formed. A rectangular locking ridge 26 is formed in the plan view at the rear end of the upper surface of the extending wall 22. Each of such locking ridges 26 has an inclined front surface 26a that inclines downward toward the front and a steep (ie, extending substantially perpendicular to the upper surface of the extending wall 22) rear surface 26b. Further, a notch 28 is formed in a portion of the extending wall 22 located below the locking piece 24, and an upwardly raised rib 30 is formed at the rear end of the upper surface of the extending wall 22.

The illustrated temperature detector 2 further comprises a pair of metal spring pieces 32. Continuing the description with reference to FIG. 4, each of the spring pieces 32, which can be formed from an appropriate metal plate such as a stainless steel plate, a high carbon steel plate, or a spring steel plate which is an alloy steel plate, extends substantially flat. It has a mounting portion 32a to be mounted and a functional portion 32b extending upward and rearward from the front end of the mounting portion 32a to the pressing force applying end 32c. At the rear end of the mounting portion 32a, a rectangular locked hole 32d corresponding to the locking ridge 26 formed on the upper surface of the extending wall 22 is formed. Each of such spring pieces 32 engages with the upper surface of the extension wall 22 with the mounting portion 32a facing the extension wall 22 from front to back, as is clearly understood by reference to FIG. It is attached to the extending wall 22 of the case 16 by moving it through the lower surface of the stop piece 24 and fitting the locked hole 32d into the locking ridge 26 formed on the upper surface of the extending wall 22. Will be done. At this time, the mounting portion 32a of the spring piece 32 is guided by the inclined front surface 26a of the locking ridge 26, and the non-locking hole 32d is sufficiently easily fitted into the locking ridge 26. Then, once the non-locking hole 32d is fitted into the locking ridge 26, the mounting portion 32a of the spring piece 32 is moved forward with respect to the locking ridge 26 by the steep rear surface 26b of the locking ridge 26. It is prevented from moving and being separated from the extension wall 22.

In the temperature detector 2 as described above, the heat receiving substrate 4 to which the conductive pattern 10, the temperature measuring element 12, and the uncoated end 14a of the pair of lead wires 14 are fixed is press-fitted into the opening 20 from below the case 16. By doing so, it is attached to the case 16. The depth of the recess defining the opening 20 is somewhat smaller than the thickness of the heat-receiving substrate 4, thus the back surface of the heat receiving substrate 4 is caused to exposed downwardly from the lower surface of the case 16 are made to protrude downward. Next, as shown in FIG. 5, the case is maintained in a state in which the pair of lead wires 14 other than the uncoated end portions 14a fixed to the pair of lead wire fixing regions 10b of the conductive pattern 10 stand up from the heat receiving substrate 4. A potting resin is filled and cured between the front wall 18a and the side walls 18b and 18c of the main portion 18 of the case 16 from the upper side and the rear side to the lower side and the front side of the case 16, thus forming the resin potting 34. It is convenient that the potting resin to be filled is an epoxy resin or a silicon resin having a viscosity of about 5 Pa · s to 80 Pa · s, particularly about 28 Pa · s to 58 Pa · s, or a resin to which an appropriate filler is added. be. When the potting resin is filled, the pair of lead wires 14 are maintained in a state of rising from the heat receiving substrate 4 except for the uncoated end portions 14a fixed to the pair of lead wire fixing regions 10b of the conductive pattern 10. The entire uncoated end 14a of the pair of lead wires 14 can be potted well without gaps together with the conductive pattern 10 and the temperature measuring element 12 without being hindered by the coating of the lead wire 14 whose so-called resin wetting is not good. can. In addition, since the space surrounded by the front wall 18a of the main portion 18 and the side walls 18b and 18c in the case 16 is filled with the potting resin, the potting resin does not flow out to the front or side, and is sufficiently easily as required. Can be filled. When the potting resin 34 is formed as described above, the case 16 and the heat receiving substrate 4 press-fitted into the opening 20 thereof are adhered to each other by the potting resin 34, as is clearly understood by referring to FIGS. 1 and 5. Therefore, it is surely prevented that the heat receiving substrate 4 is accidentally detached from the case 16.

6 and 7 illustrate a typical usage pattern of the temperature detector 2 as described above. In the mode shown in FIGS. 6 and 7, the temperature detector 2 is used to detect the temperature of the upper surface of the capacitor 36 containing the plurality of storage elements. The temperature detector 2 is preloaded in a mounting frame 38 that can be integrally molded from an appropriate synthetic resin, and the mounting frame 38 is fixed to the capacitor 36 by an appropriate fixing means (not shown) to the capacitor 36. On the other hand, it can be arranged as required. Instead of this, the temperature detector 2 may be fixed at the required position by arranging the temperature detector 2 on the upper surface of the capacitor 36 as required and then fixing the mounting frame 38 to the capacitor 36 as required. can. The illustrated mounting frame 38 has a storage space having openings formed on the lower surface, the front surface, and the upper surface, and the temperature detector 2 is housed in the storage space. When the temperature detector 2 and the mounting frame 38 are combined with respect to the capacitor 36 in the state as shown in FIGS. 6 and 7, the lower surface of the heat receiving substrate 4 of the temperature detector 2 becomes the upper surface of the capacitor 36 to be measured. It is brought into contact. Then, due to the pressing force applied to each pressing piece application end 32c of the spring piece 32 of the temperature detector 2 from an appropriate pressing piece (not shown) arranged on the inner surface of the rear wall of the mounting frame 36. Therefore, the lower surface of the heat receiving substrate 4 is elastically pressed against the upper surface of the capacitor 36. To move the temperature detector 2 forward with respect to the mounting frame 38, limiting protrusions (not shown) formed on both inner surfaces of the mounting frame 36 are formed on the extending wall 22 of the case 16 of the temperature detector 2. It is blocked by locking in the notch 28. Thus, the capacitor 36 and the mounting frame 38 are for explaining an example of the use of the temperature detector 2 configured according to the present invention, and therefore detailed description thereof is omitted in the present specification. do.

2: Temperature detector 4: Heat receiving substrate 10: Conductive pattern 10a: Temperature measuring element fixing area 10b: Lead wire fixing area 10c: Connection area 12: Temperature measuring element 14: Lead wire 14a: Uncovered end 16: Case 18: Case main part 18a: Front wall 18b: Side wall 18c: Side wall 18d: Rear wall 20: Opening 22: Extension wall 24: Locking piece 26: Locking ridge 26a: Inclined front surface 26b: Steep rear surface 32: Spring piece 32a: Mounting part 32b: Functional part 32c: Pushing pressure application end 32d: Locked hole 34: Potting resin

Claims (6)

A pair of connection areas arranged on the surface of the heat receiving substrate and connecting each of the temperature measuring element fixing area, the pair of lead wire fixing areas, and the pair of lead wire fixing areas to the temperature measuring element fixing area. A conductive pattern having a A temperature detector containing the temperature measuring element and a potting resin covering at least the uncoated end of the pair of lead wires.
It has a front wall and both side walls, and a bottom surface is provided with a synthetic resin case in which an opening for mounting the heat receiving substrate is defined.
The heat receiving substrate is press-fitted into the opening of the case with its back surface exposed from the opening and the temperature measuring element fixing region located on the front wall side.
The potting resin causes the pair of lead wires to stand up from the heat receiving substrate except for the uncoated end portions fixed to the pair of lead wire fixing regions, and is used between the front wall and both side walls of the case. It is formed by filling the resin curing,
The heat receiving substrate is adhered to the case by the potting resin .
A temperature detector characterized by that. The case has a rear wall, front wall, the both side walls and rear walls defining the main portion of the rectangular cylindrical shape, the temperature detector according to claim 1 Symbol placement. Each of the side walls of the case is integrally provided with a laterally extending wall, and each of the extending walls is equipped with a metal spring piece having a free end for applying a pressing force. The temperature detector according to claim 1 or 2. The spring piece has a mounting portion extending flatly and a functional portion extending in an arc shape from the front end of the mounting portion upward and rearward to the pressing force application end, and the mounting portion is the extending wall. The temperature detector according to claim 3 , which is mounted on the upper surface of the above. A locking piece located above the front end of the extending wall is integrally attached to each of the both side walls of the case, and a locking protrusion is provided on the upper rear end of each of the extending walls. The strips are formed integrally,
A locked hole corresponding to the locking ridge is formed in the mounting portion of the spring piece.
The spring piece has the locked hole fitted in the locking ridge, and the mounting portion is directed forward from the rear end of the upper surface of the extending wall, and the extending wall and the locking piece The temperature detector according to claim 4 , which is mounted on the extending wall by extending through the space. The temperature detector according to claim 5 , wherein the locking ridge has a steep rear surface and an inclined front surface that inclines downward toward the front.

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