Thermistor

Abstract

The thermistor is provided with: a holding member that is attached to a wall section that partitions the inside and the outside of a case member; and a thermistor body that is held by the holding member and detects the temperature inside the housing member. The thermistor body is provided with: a thermistor element for detecting temperature; a lead electrically connected to the thermistor element; and a resin part which covers the thermistor element and from which the lead wire is led out to the outside. The holding member includes: a holding portion that holds the resin portion and arranges the thermistor element inside the frame member; and a lead-out part for leading out the lead wire to the outside of the frame member.

Description

Technical Field

[0001] The present invention relates to thermistors. Background Art

[0002] In the past, as a thermistor, there was a pipe mounting component as a retaining component, and the pipe mounting component was assembled to a wall portion that divides the inside and outside of a pipe as a frame member. In addition, a thermistor having a thermistor body that is retained in the pipe mounting component and detects the temperature inside the pipe is known (see patent document 1: JP 2023-006323A). In the thermistor of patent document 1, the thermistor body has a thermistor element for detecting temperature, a lead wire electrically connected to the thermistor element, and a resin portion that is integrally provided with the lead wire in a manner covering the lead wire. In such a thermistor, by assembling the resin portion to the pipe mounting component, the thermistor body is assembled to the pipe mounting component, and the thermistor element is arranged inside the pipe. Summary of the invention

[0003] Technical problem that the invention aims to solve

[0004] However, in the thermistor of patent document 1, when the thermistor main body is assembled in the state of the holding component, the lead is covered by the resin portion, and the resin portion is covered by the holding component. Therefore, the lead becomes a state doubly covered by the resin portion and the holding component, and the heat inside the frame member is difficult to transfer to the lead. The lead is drawn to the outside of the frame member and is easily affected by the temperature outside the frame member. If the heat inside the frame member is difficult to transfer to the lead, the temperature difference between the inside of the frame member and the lead becomes larger. If the temperature difference between the inside of the frame member and the lead becomes larger, it is possible to affect the detection temperature of the thermistor element, and the thermistor element detects the temperature electrically connected to the lead, and the detection accuracy is likely to be reduced.

[0005] The present invention has been made in view of the above-mentioned problems. An object of the present invention is to provide a thermistor capable of improving detection accuracy.

[0006] Technical solutions to the problem

[0007] The thermistor according to the embodiment includes: a holding member assembled to a wall portion separating the inside and outside of a frame member; and a thermistor body held by the holding member and detecting the temperature inside the frame member. The thermistor body includes: a thermistor element detecting temperature; a lead wire electrically connected to the thermistor element; and a resin portion covering the thermistor element and from which the lead wire is led to the outside. The holding member includes: a holding portion holding the resin portion and arranging the thermistor element inside the frame member; and a lead-out portion leading the lead wire to the outside of the frame member.

[0008] Effects of the Invention

[0009] According to the embodiment, it is possible to provide a thermistor capable of improving detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a perspective view of the thermistor according to the embodiment.

[0011] Figure 2 It is a side view of the thermistor according to the embodiment.

[0012] Figure 3 It is a cross-sectional view of the thermistor according to the embodiment.

[0013] Figure 4 It is a perspective view of a thermistor body of the thermistor according to the embodiment.

[0014] Figure 5 It is a perspective view of the thermistor body excluding the resin portion of the thermistor according to the embodiment. DETAILED DESCRIPTION

[0015] Hereinafter, the thermistor according to the embodiment will be described in detail with reference to the drawings. In addition, for the convenience of description, the dimensional ratios in the drawings are exaggerated and may be different from the actual ratios.

[0016] like Figure 1 As shown, the thermistor 1 according to the embodiment is used, for example, to detect the internal temperature of a frame member (not shown) such as a duct that supplies air to a battery cell mounted on a vehicle. The thermistor 1 can detect the internal temperature of the duct, for example, so that appropriate air can be supplied from the duct, and the temperature of the battery cell can be controlled. By controlling the temperature of the battery cell, the driving output of the battery cell to the vehicle can be stabilized.

[0017] like Figure 1 to Figure 5 As shown, the thermistor 1 includes a holding member 3 and a thermistor body 5 .

[0018] like Figure 1 to Figure 3 As shown, the retaining member 3 is, for example, made of insulating materials such as polypropylene (PP resin). The retaining member 3 is formed as a cylindrical shape in a manner extending from the inside and outside of the frame member relative to the wall portion (not shown) separating the inside and outside of the frame member. The retaining member 3 is inserted through a hole (not shown) formed through the wall portion of the frame member and assembled to the wall portion. The outer surface of the retaining member 3 configured at the wall portion is provided with a flange portion 7 abutting against the outer surface of the outer side of the wall portion. The outer surface of the retaining member 3 configured at the inner side of the frame member is provided with a pair of elastically deformable locking pieces 9 engaged with the edge of the hole of the wall portion.

[0019] The holding member 3 is inserted into the hole of the wall of the frame member from the outside to the inside of the frame member. At this time, the pair of locking pieces 9 abut against the edge of the hole and are elastically deformed, and the holding member 3 can be inserted into the hole. If the holding member 3 is further inserted into the hole, the flange portion 7 abuts against the wall of the frame member, and the insertion of the holding member 3 is completed. At this time, the pair of locking pieces 9 recover from elastic deformation and engage with the edge of the hole, and the holding member 3 is assembled to the wall of the frame member. The holding member 3 includes a holding portion 11 and a lead-out portion 13.

[0020] The holding portion 11 is provided in the portion disposed inside the frame member in the holding component 3. The holding portion 11 is a space portion divided by the top surface of the insertion portion 15 extending from the flange portion 7 toward the inside of the frame member and the inner surface of a pair of holding walls 17 extending from the top surface side of the insertion portion 15 toward the inside of the frame member. In addition, on the outer surface of the pair of holding walls 17, the base ends of a pair of locking pieces 9 are formed by a continuous member. The resin portion 33 of the thermistor body 5 described later is accommodated in the holding portion 11. The holding portion 11 is provided with an elastically deformable holding piece 19, which extends from the top surface of the insertion portion 15 toward the inside of the frame member. The holding piece 19 engages with the resin portion 33 in a state where the resin portion 33 is accommodated in the holding portion 11, and the thermistor body 5 is held in the holding component 3. The holding portion 11 is provided with a plurality of resin exposed portions 21, which expose the resin portion 33 accommodated in the holding portion 11 to the outside. The resin exposed portion 21 is formed as an opening between the pair of retaining walls 17, between the pair of retaining walls 17 and the retaining piece 19, and at the end side of the pair of retaining walls 17 and the retaining piece 19. By providing the resin exposed portion 21 in the retaining portion 11, the resin portion 33 can directly contact the internal air inside the frame member, and the temperature detection accuracy of the thermistor body 5 can be improved.

[0021] The lead-out portion 13 is provided in the holding member 3 at the portion disposed inside and outside the frame member. The lead-out portion 13 includes an insertion portion 15 and a cylindrical portion 23 extending in a cylindrical shape from the flange portion 7 toward the outside of the frame member. The insertion portion 15 is provided with an insertion hole 25 which is connected to the holding portion 11 and the cylindrical portion 23 and through which a lead 31 of the thermistor body 5 described later can be inserted. The insertion portion 15 is provided with a lead wire exposure portion 27 which is connected to the insertion hole 25 so that the lead wire 31 inserted in the insertion hole 25 is exposed to the outside. By providing the lead wire exposure portion 27 in the lead-out portion 13, the lead wire 31 can directly contact the internal gas inside the frame member, and the temperature of the lead wire 31 can be close to the temperature inside the frame member. The lead wire 31 inserted in the insertion hole 25 is arranged in the cylindrical portion 23. A connector (not shown) electrically connected to a controller (not shown) for controlling various mechanisms mounted on the vehicle can be fitted into the cylindrical portion 23. By fitting the connector into the cylindrical portion 23, the temperature inside the frame member detected by the thermistor body 5 is input to the controller.

[0022] like Figures 1 to 5 As shown, the thermistor body 5 is assembled to the holding member 3 before the holding member 3 is assembled to the frame member. The thermistor body 5 includes the thermistor element 29 , lead wires 31 , and a resin portion 33 .

[0023] The thermistor element 29 is composed of, for example, an electronic component whose resistance changes according to a temperature change. When the holding member 3 is assembled to the frame member, the thermistor element 29 is arranged inside the frame member to detect the temperature inside the frame member.

[0024] The lead wire 31 includes a conductive material, and one end side is electrically connected to the thermistor element 29. A plurality of (two in this case) lead wires 31 are provided relative to the thermistor element 29. When the thermistor body 5 is assembled to the holding member 3, the other end side of the lead wire 31 is inserted through the insertion hole 25 of the insertion portion 15 and is arranged inside the cylindrical portion 23. When the holding member 3 is assembled to the frame member, one end side of the lead wire 31 is arranged inside the frame member, and the other end side is arranged outside the frame member. The lead wire 31 is electrically connected to the controller via the connector by fitting the connector to the cylindrical portion 23.

[0025] The resin portion 33 includes epoxy resin, which is an insulating material having better thermal conductivity than PP resin. The resin portion 33 is insert-molded into a rectangular parallelepiped shape in a manner that covers the thermistor element 29 and leads the lead 31 to the outside. When the thermistor body 5 is assembled to the holding member 3, the resin portion 33 is accommodated in the holding portion 11 and the holding piece 19 is engaged, so that the thermistor body 5 is held in the holding member 3. When the holding member 3 is assembled to the frame member, the resin portion 33 is arranged inside the frame member, so that the thermistor element 29 is arranged inside the frame member.

[0026] Since the lead wire 31 is led out to the outside, the resin part 33 is in a state where only the holding part 3 (insertion part 15) is arranged around the lead wire 31 located inside the frame body component. Therefore, the heat inside the frame body component is easily transferred to the lead wire 31, and the temperature of the lead wire 31 is close to the temperature inside the frame body component. If the temperature of the lead wire 31 is close to the temperature inside the frame body component, the influence of the thermistor element 29 electrically connected to the lead wire 31 on the detected temperature can be suppressed. Therefore, the detection accuracy of the temperature detected by the thermistor element 29 can be improved. In addition, the resin part 33 contains epoxy resin with excellent thermal conductivity, so the heat inside the frame body component is easily transferred to the thermistor element 29, which can improve the temperature detection accuracy of the thermistor element 29.

[0027] In a state before the holding member 3 is assembled to the frame member, the thermistor body 5 is assembled to the holding member 3 by inserting the end of the lead wire 31 into the insertion hole 25 from the holding portion 11 side of the holding member 3. The insertion of the thermistor body 5 into the holding member 3 is completed by the abutment of the resin portion 33 with the top surface of the insertion portion 15 and the abutment of the step portion of the lead wire 31 with the step portion of the insertion hole 25. At this time, the holding piece 19 of the holding portion 11 is engaged with the resin portion 33, and the thermistor body 5 is held by the holding member 3.

[0028] Such a thermistor 1 includes: a holding member 3 assembled to a wall portion that divides the inside and outside of a frame member; and a thermistor body 5 that is held by the holding member 3 and detects the temperature inside the frame member. The thermistor body 5 includes a thermistor element 29 for detecting temperature, a lead 31 electrically connected to the thermistor element 29, and a resin portion 33 that covers the thermistor element 29 and leads the lead 31 to the outside. The holding member 3 includes a holding portion 11 that holds the resin portion 33 and arranges the thermistor element 29 inside the frame member, and a lead portion 13 that leads the lead 31 to the outside of the frame member.

[0029] Since the lead 31 is led out to the outside, the resin part 33 held by the holding part 11 is in a state where only the holding part 3 is arranged around the lead 31 located inside the frame member. Therefore, the heat inside the frame member is easily transferred to the lead 31, and the temperature of the lead 31 is close to the temperature inside the frame member. If the temperature of the lead 31 is close to the temperature inside the frame member, the influence of the thermistor element 29 electrically connected to the lead 31 on the detection temperature can be suppressed.

[0030] Therefore, in such thermistor 1 , the detection accuracy can be improved.

[0031] Furthermore, the holding portion 11 is provided with a resin exposed portion 21 for exposing the resin portion 33 inside the frame member.

[0032] Therefore, the resin portion 33 can directly come into contact with the internal air inside the frame member through the resin exposed portion 21 , and the temperature detection accuracy of the thermistor body 5 can be improved.

[0033] Furthermore, the lead portion 13 is provided with a lead wire exposing portion 27 for exposing the lead wire 31 inside the frame member.

[0034] Therefore, the leads 31 can directly come into contact with the internal air in the frame member through the lead exposed portions 27 , and the temperature of the leads 31 can be brought close to the temperature inside the frame member.

[0035] In addition, the resin portion 33 contains epoxy resin.

[0036] Therefore, the heat inside the frame member can be easily transferred to the thermistor element 29 disposed inside the resin portion 33 by the epoxy resin having excellent thermal conductivity, and the temperature detection accuracy of the thermistor element 29 can be improved.

[0037] As mentioned above, although this embodiment was demonstrated, this embodiment is not limited to this, Various deformation|transformation is possible within the range of the summary of this embodiment.

[0038] For example, the number of leads is two, but the present invention is not limited thereto and the number of leads may be three or more.

Claims

1. A thermistor, characterized in that: have: a holding member assembled to a wall portion of the frame member, the wall portion separating the inside and the outside of the frame member; and a thermistor body which is held by the holding member and detects the temperature inside the frame member, The thermistor body has: a thermistor element, wherein the thermistor element detects temperature; A lead wire electrically connected to the thermistor element; and a resin portion, the resin portion covering the thermistor element, and the lead wire being led outward from the resin portion, The holding member comprises: a holding portion that holds the resin portion and arranges the thermistor element inside the frame member; and The lead-out portion leads the lead wire to the outside of the frame member.

2. The thermistor according to claim 1, characterized in that: The holding portion is provided with a resin exposure portion that exposes the resin portion inside the frame member.

3. The thermistor according to claim 1, characterized in that: The lead portion is provided with a lead wire exposure portion that exposes the lead wire inside the frame member.

4. The thermistor according to claim 1, characterized in that: The resin portion includes epoxy resin.

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