Conduction module

Abstract

To improve temperature measurement accuracy.SOLUTION: A wiring component 20 has a branch body 22 that is provided with a battery contact surface 22a brought into contact with an outer wall surface of a battery cell BC. A bus bar 10 has a circuit connection body 12 that is connected with a first circuit conductor 23 on a mounting surface 22b of the branch body, and a connection body 13 that connects the circuit connection body with a bus bar body 11 and presses the battery contact surface 22a of the branch body against the outer wall surface of the battery cell with the circuit connection body. A thermistor 30 is connected with second circuit conductors 24 on the mounting surface of the branch body.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a conductive module. [Background technology]

[0002] The conductive module is a wiring module that electrically connects a battery module in which a plurality of battery cells are arranged and a battery monitoring unit that monitors the battery state of the battery cells. The conductive module includes a bus bar that is connected to one or a pair of battery cells of the battery module, a wiring component that includes a plurality of circuit conductors that are electrically connected to the battery monitoring unit, and a thermistor that detects the temperature of the battery cell. The bus bar includes a bus bar body that is physically and electrically connected to the electrode terminal of the battery cell, a circuit connector that is physically and electrically connected to a first circuit conductor of the wiring component, and a heat collector that is disposed in a through hole and surrounds the thermistor. The circuit connector and the heat collector are provided in a protruding state relative to the bus bar body. The thermistor is physically and electrically connected to a second circuit conductor of the wiring component. This type of conductive module is disclosed, for example, in Patent Document 1 below. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 005999 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional conductive module, a part of the wiring component is disposed between the battery cell and the thermistor, but the wiring component does not necessarily contact the outer wall surface of the battery cell. In the conventional conductive module, if the wiring component does not contact the outer wall surface of the battery cell, the thermal resistance between the wiring component and the battery cell increases, and there is a possibility that the thermistor detects a temperature lower than the temperature of the outer wall surface of the battery cell, so there is room for improvement in the accuracy of measuring the temperature of the battery cell.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS An object of the present invention is to provide a conductive module capable of improving the accuracy of temperature measurement. [Means for solving the problem]

[0006] The present invention comprises a bus bar connected to one or a pair of battery cells of a battery module in which a plurality of battery cells are arranged, a wiring component formed to be flexible and flat and containing a plurality of circuit conductors electrically connected to a battery monitoring unit that monitors the battery state of the battery cells, and a thermistor that detects the temperature of the battery cell, wherein the wiring component has a wiring main body and branch bodies branched from the wiring main body for each of the plurality of bus bars and provided with a battery contact surface that comes into contact with an outer wall surface of the battery cell, and the bus bar has a bus bar main body physically and electrically connected to an electrode terminal of the battery cell, a circuit connector physically and electrically connected to a first circuit conductor of the plurality of circuit conductors on a mounting surface of the branch body opposite to the battery contact surface, and a connector that connects the circuit connector to the bus bar main body and presses the battery contact surface of the branch body against the outer wall surface of the battery cell via the circuit connector, and the thermistor is physically and electrically connected to a second circuit conductor of the plurality of circuit conductors on the mounting surface of the branch body. Effect of the Invention

[0007] The conductive module of the present invention brings the branch body into contact with the outer wall surface of the battery cell via the bus bar, allowing the branch body to directly receive the heat from the battery cell, thereby improving the temperature measurement accuracy of the thermistor connected to the mounting surface of the branch body. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a part of a conductive module according to an embodiment. [Diagram 2] FIG. 2 is a perspective view showing a bus bar according to the embodiment. [Diagram 3] FIG. 3 is a perspective view showing a part of the wiring component according to the embodiment. [Figure 4] FIG. 4 is a perspective view illustrating a modified embodiment of the bus bar according to the embodiment. [Diagram 5] FIG. 5 is a perspective view showing the thermistor of the embodiment together with a wiring component. [Figure 6] FIG. 6 is a perspective view showing a part of a conductive module according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a conductive module according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to this embodiment.

[0010] [Embodiment] One embodiment of a conductive module according to the present invention will be described with reference to FIGS.

[0011] Reference numeral 1 in Fig. 1 indicates a conductive module of this embodiment. This conductive module 1 is assembled to a battery module BM in which a plurality of battery cells BC are arranged (for example, arranged in a row), and this battery module BM is electrically connected to, for example, a battery monitoring unit (not shown), which allows the battery monitoring unit to monitor the battery state of the battery cells BC. This conductive module 1 constitutes a battery pack BP together with the battery module BM (Fig. 1). The battery pack BP is mounted, for example, on a vehicle (BEV: Battery Electric Vehicle, HEV: Hybrid Electric Vehicle, etc.) equipped with a rotating machine as a drive source, and is used to supply power to the rotating machine, etc.

[0012] The battery cell BC includes a cell body BC1 and positive and negative electrode terminals BC2 (FIG. 1). The battery cell BC shown here has a cell body BC1 formed in a rectangular shape with six outer wall surfaces, and the positive and negative electrode terminals BC2 are provided on one of the six outer wall surfaces of the cell body BC1. In the battery module BM, the cell bodies BC1 adjacent to each other in the arrangement direction are arranged with one outer wall surface facing each other. Thus, in the battery cell BC shown here, the positive and negative electrode terminals BC2 are provided on one of the four outer wall surfaces along the arrangement direction of the battery cells BC. On one outer wall surface of the cell body BC1, the electrode terminal BC2 serving as a positive electrode is arranged at one end in a direction perpendicular to the arrangement direction of the battery cells BC, and the electrode terminal BC2 serving as a negative electrode is arranged at the other end in the perpendicular direction.

[0013] The positive and negative electrode terminals BC2 may be, for example, plate-shaped or rectangular-shaped provided on one of the outer wall surfaces of the cell body BC1, or may be columnar poles protruding from one of the outer wall surfaces of the cell body BC1. In the case of the plate-shaped or rectangular-shaped electrode terminal BC2, a bus bar described later is physically and electrically connected to the electrode terminal BC2 by welding or the like. In the case of the columnar electrode terminal BC2, a male screw portion is provided in the electrode terminal BC2, so that the electrode terminal BC2 is inserted into a through hole of the bus bar described later, and a female screw member (not shown) is screwed into the male screw portion of the electrode terminal BC2, thereby physically and electrically connecting the bus bar described later to the electrode terminal BC2. Here, the columnar electrode terminal BC2 is taken as an example.

[0014] In the battery module BM, one electrode terminal BC2 and the other electrode terminal BC2 of the plurality of battery cells BC are arranged in the arrangement direction of the plurality of battery cells BC. In this battery module BM, one electrode terminal BC2 of a pair adjacent in the arrangement direction is electrically connected to each other electrode terminal BC2 of the pair by a bus bar described later. In addition, in this battery module BM, the other electrode terminal BC2 of a pair adjacent in the arrangement direction is electrically connected to each other electrode terminal BC2 of the pair by a bus bar described later. One of the pair of electrode terminals BC2 adjacent in the arrangement direction may be a positive electrode and the other may be a negative electrode, or both may be positive electrodes or negative electrodes. Here, the plurality of battery cells BC are arranged such that one of the pair of electrode terminals BC2 adjacent in the arrangement direction is a positive electrode and the other is a negative electrode. In this battery module BM, a bus bar described later is physically and electrically connected to one electrode terminal BC2 that is a total positive electrode, and a bus bar described later is physically and electrically connected to one electrode terminal BC2 that is a total negative electrode.

[0015] The conductive module 1 includes a bus bar that is connected to one or a pair of battery cells BC of the battery module BM. This bus bar is a metal plate-shaped conductive part, and is formed by press forming using a metal plate as a base material, for example.

[0016] When a single battery cell BC is to be connected, the bus bar is formed to physically and electrically connect to the electrode terminal BC2 serving as the total positive electrode or the electrode terminal BC2 serving as the total negative electrode. The pair of battery cells BC to be connected to the bus bar are adjacent to each other in the arrangement direction of the multiple battery cells BC, and each of the pair includes one electrode terminal BC2 and the other electrode terminal BC2 of the pair adjacent to each other in the arrangement direction. Thus, when a pair of battery cells BC is to be connected, the bus bar is formed to physically and electrically connect to one electrode terminal BC2 of the pair adjacent to each other in the arrangement direction, thereby electrically connecting the one electrode terminal BC2 of the pair. Furthermore, the bus bar in this case is formed to physically and electrically connect to the other electrode terminal BC2 of the pair adjacent to each other in the arrangement direction, thereby electrically connecting the other electrode terminal BC2 of the pair.

[0017] Here, a bus bar 10 for connecting a pair of battery cells BC is taken as a representative example (FIGS. 1 and 2). In the conductive module 1, the bus bar 10 is provided for each combination of a pair of electrode terminals BC2.

[0018] The busbar 10 has a busbar body 11 that is physically and electrically connected to the electrode terminals BC2 of the battery cell BC (FIGS. 1 and 2). The busbar body 11 has through holes 11a for each of the two electrode terminals BC2 (FIG. 2), and the pair of electrode terminals BC2 are inserted into the through holes 11a for each electrode terminal BC2. With the busbar body 11 installed in a predetermined position, the busbar 10 physically and electrically connects the busbar body 11 to each electrode terminal BC2 by screwing a female screw member into the male screw portion of the electrode terminal BC2.

[0019] The conductive module 1 electrically connects the bus bars 10 to a battery monitoring unit, thereby allowing the battery monitoring unit to monitor the battery state of each battery cell BC. Therefore, the conductive module 1 includes a wiring component 20 that is flexible and flat and contains multiple circuit conductors that are electrically connected to the battery monitoring unit (FIGS. 1 and 3).

[0020] The wiring component 20 shown here is a flexible printed circuit board, and the circuit conductors are formed by a conductor pattern. This wiring component 20 is provided with various films formed flat with flexibility as an insulating coating, and a conductor pattern is formed on at least one of the various films. The conductor pattern (circuit conductor) is enclosed by the insulating coating, and, for example, a place that becomes an electrical contact point with other components is exposed.

[0021] The wiring component 20 has a wiring main body 21 and branch bodies 22 branched from the wiring main body 21 for each of the bus bars 10 (FIGS. 1 and 3).

[0022] The wiring main body 21 runs parallel to the multiple battery cells BC aligned in the arrangement direction of the multiple battery cells BC. In the wiring component 20, a first circuit conductor 23 (FIG. 3) of the multiple circuit conductors contained in the wiring main body 21 is electrically connected to the battery monitoring unit.

[0023] In the wiring component 20, a first circuit conductor 23 contained in a branch body 22 is physically and electrically connected to the bus bar 10. The branch body 22 branches off from the wiring main body 21 and protrudes from the wiring main body 21 toward the outer wall surface of one of a pair of battery cells BC electrically connected by the bus bar 10. Here, the branch body 22 protrudes toward the outer wall surface of the battery cell BC on which the electrode terminal BC2 is disposed. The branch body 22 is provided with a battery contact surface 22a that comes into contact with the outer wall surface of the battery cell BC (FIG. 3). In this branch body 22, the battery contact surface 22a comes into direct contact with the outer wall surface of the battery cell BC.

[0024] The busbar 10 has a circuit connection body 12 that is physically and electrically connected to the first circuit conductor 23 (FIGS. 1 and 2). The circuit connection body 12 is disposed at a position protruding from the busbar body 11, and is physically and electrically connected to the first circuit conductor 23 contained in the branch body 22. The circuit connection body 12 has a circuit connection portion 12a that is physically and electrically connected to the first circuit conductor 23 on a mounting surface 22b (FIG. 3) on the opposite side to the battery contact surface 22a of the branch body 22 (FIG. 2). For example, in the circuit connection body 12, the circuit connection portion 12a is soldered to the first circuit conductor 23 exposed from the insulating coating on the mounting surface 22b of the branch body 22.

[0025] In the busbar 10 shown here, the busbar body 11 and the circuit connector 12 are each formed in a flat plate shape. The circuit connector 12 is offset from the busbar body 11 in a direction perpendicular to the plane while keeping their planes parallel to each other, and is disposed at a position offset in a direction along the planes of the two bodies. At this position, the circuit connector 12 sandwiches the branch body 22 between the circuit connector 12 and the outer wall surface of the battery cell BC, and the battery contact surface 22a of the branch body 22 directly contacts the outer wall surface of the battery cell BC.

[0026] This busbar 10 has a connector 13 that connects the circuit connector 12 to the busbar body 11 (FIGS. 1 and 2). In this busbar 10, the busbar body 11 is fixed to the electrode terminal BC2 of the battery cell BC, so that the connector 13 can press the battery contact surface 22a of the branch body 22 against the outer wall surface of the battery cell BC via the circuit connector 12.

[0027] The connecting body 13 shown here is formed in a flat plate shape, with its plane aligned in a direction perpendicular to the planes of the busbar body 11 and the circuit connecting body 12, and one end and the other end are respectively connected in the perpendicular direction to the peripheral edge of the busbar body 11 and the peripheral edge of the circuit connecting body 12. In this busbar 10, the connecting body 13 is bent at 90 degrees relative to the busbar body 11, and the circuit connecting body 12 is bent at 90 degrees relative to the connecting body 13, so that the circuit connecting body 12 and the connecting body 13 protrude from the busbar body 11 in a crank shape.

[0028] This busbar 10 may be molded as a single member having the busbar body 11, the circuit connector 12, and the connector 13 (busbar 10A shown in Figs. 1 and 2), or the busbar body 11 and the connection member 14 having the circuit connector 12 and the connector 13 may be molded as separate members, and the busbar body 11 and the connection member 14 are fixed together by welding or the like to form an integrated body (busbar 10B shown in Fig. 4). For example, the connection member 14 is molded in a crank shape having a fixing portion 14a for fixing to the busbar body 11.

[0029] The circuit connector 12 shown here has a through hole 12b, and a circuit connector 12a is provided on a hole periphery 12c of this through hole 12b (FIGS. 1, 2, and 4). Here, the circuit connector 12 is formed with a rectangular through hole 12b and a circular hole periphery 12c.

[0030] The conductive module 1 includes a thermistor 30 that detects the temperature of the battery cell BC via the branch body 22 (FIGS. 1, 4, and 5). The thermistor 30 is, for example, a chip thermistor, and is physically and electrically connected to a second circuit conductor 24 (FIG. 3) among the multiple circuit conductors on the mounting surface 22b of the branch body 22. The thermistor 30 shown here is physically and electrically connected to the second circuit conductor 24 in a through hole 12b whose bottom surface is the mounting surface 22b of the branch body 22.

[0031] Here, in the wiring component 20, the second circuit conductor 24 contained in the wiring main body 21 is electrically connected to the battery monitoring unit side in the same manner as the first circuit conductor 23. The first circuit conductor 23 and the second circuit conductor 24 are arranged in the branch body 22 from the wiring main body 21 side to the mounting surface 22b of the branch body 22. For example, the first circuit conductor 23 and the second circuit conductor 24 are arranged in a straight line from the wiring main body 21 side to the mounting surface 22b of the branch body 22 in the branch body 22. In the hole peripheral portion 12c, the circuit connection portion 12a is arranged to face the first circuit conductor 23 on the mounting surface 22b, so that the circuit connection portion 12a is physically and electrically connected to the first circuit conductor 23. On the other hand, the second circuit conductor 24 is exposed from the insulating coating at the mounting surface 22b of the branch body 22 and arranged to straddle the hole peripheral portion 12c into the through hole 12b. Therefore, it is preferable to provide a recess (not shown) in the hole periphery 12c to prevent contact with the second circuit conductor 24 of the mounting surface 22b.

[0032] In this conductive module 1, the circuit connector 12 presses the branch body 22 against the outer wall surface of the battery cell BC, bringing the battery contact surface 22a of the branch body 22 into contact with the outer wall surface of the battery cell BC. Therefore, in this conductive module 1, the branch body 22 directly receives the heat of the battery cell BC, improving the accuracy of temperature measurement by the thermistor 30. Also, in this conductive module 1, the heat loss in the through hole 12b of the circuit connector 12 can be suppressed by the heat from the hole periphery 12c, improving the accuracy of temperature measurement by the thermistor 30.

[0033] The thermistor 30 has electrical connection portions 31, 32 at one end and the other end (FIG. 5). In this thermistor 30, the electrical connection portion 31 at one end and the electrical connection portion 32 at the other end are physically and electrically connected to a first contact on one side and a second contact on the other side of the second circuit conductor 24, which is divided by the branch body 22. In this thermistor 30, the electrical connection portion 31 at one end is soldered to the first contact of the second circuit conductor 24, and the electrical connection portion 31 at the other end is soldered to the second contact of the second circuit conductor 24.

[0034] The thermistor 30 maintains an insulating distance from the hole periphery 12c by an insulating sealing member 40 filled in the through hole 12b (FIGS. 1 and 4). The sealing member 40 has a higher thermal conductivity than air. Therefore, in the conductive module 1, the sealing member 40 can also suppress heat loss in the through hole 12b of the circuit connector 12, thereby improving the accuracy of temperature measurement by the thermistor 30.

[0035] As described above, the conductive module 1 of this embodiment brings the branch body 22 into contact with the outer wall surface of the battery cell BC via the bus bar 10, and allows the branch body 22 to directly receive the heat of the battery cell BC, thereby improving the temperature measurement accuracy of the thermistor 30 connected to the mounting surface 22b of the branch body 22. For example, since this conductive module 1 can increase the accuracy of the temperature measurement results of the battery cell BC, it is possible to improve electricity consumption by controlling and managing the battery cell BC based on the temperature measurement results.

[0036] Furthermore, in the conductive module 1 of this embodiment, the branch body 22 is brought into contact with the outer wall surface of the battery cell BC, the thermistor 30 is disposed in the through hole 12b of the circuit connection body 12 which is physically and electrically connected to the first circuit conductor 23 of the branch body 22, and the thermistor 30 is physically and electrically connected to the second circuit conductor 24 of the branch body 22. Therefore, the conductive module 1 of this embodiment can improve the temperature measurement accuracy of the thermistor 30.

[0037] Furthermore, the conductive module 1 of this embodiment is an integrated unit in which the busbar 10, the wiring component 20, and the thermistor 30 are assembled, and the thermistor 30 can be positioned at a predetermined position relative to the battery cell BC, making it possible to measure the temperature at that predetermined position.

[0038] [Variations] The conductive module 2 of this modification is obtained by replacing the bus bar 10 in the conductive module 1 of the above-described embodiment with a bus bar 110 described below (FIG. 6).

[0039] Like the busbar 10 of the embodiment, the busbar 110 of this modification has a busbar body 111 that is physically and electrically connected to the electrode terminal BC2 of the battery cell BC, a circuit connector 112 that is physically and electrically connected to the first circuit conductor 23, and a coupling body 113 that couples these together (FIG. 6). The busbar body 111, the circuit connector 112, and the coupling body 113 are formed in a flat plate shape, like the busbar 10 of the embodiment.

[0040] Also, like the busbar 10 of the embodiment, the circuit connector 112 of this modification is offset relative to the busbar body 111 in a direction perpendicular to the plane while keeping the planes parallel to each other, and is disposed at a position offset in a direction along the planes of the busbar body 111. At this position, the circuit connector 112 sandwiches the branch body 22 between the circuit connector 112 and the outer wall surface of the battery cell BC, and the battery contact surface 22a of the branch body 22 directly contacts the outer wall surface of the battery cell BC.

[0041] In addition, like the busbar 10 of the embodiment, the circuit connection body 112 of this modified example has a circuit connection portion 112a that physically and electrically connects to the first circuit conductor 23 on the mounting surface 22b of the branch body 22, and a through hole 112b, and the circuit connection portion 112a is provided on the hole periphery 112c of the through hole 112b (Figure 6).

[0042] On the other hand, the connecting body 113 of this modified example is arranged with the orthogonal direction to its plane inclined with respect to the orthogonal direction to the plane of the busbar main body 111 (FIG. 6). The connecting body 113 of this modified example utilizes the springiness between the busbar main body 111 and the circuit connector 112 to apply a pressing force from the circuit connector 112 to the mounting surface 22b of the branch body 22 for pressing the battery contact surface 22a of the branch body 22 against the outer wall of the battery cell BC. In order to impart such springiness to the busbar 110 of this modified example, the busbar 110 is formed from a metal material that can impart springiness, such as phosphor bronze.

[0043] In this busbar 10, the connecting body 113 is bent at an obtuse angle relative to the busbar body 111, and the circuit connecting body 112 is bent at an obtuse angle relative to the connecting body 113, causing the circuit connecting body 112 and the connecting body 113 to protrude from the busbar body 111 in a crank shape, thereby providing springiness between the busbar body 111 and the circuit connecting body 112. In this busbar 110, the busbar body 111 is fixed to the electrode terminal BC2 of the battery cell BC, so that the springiness between the busbar body 111 and the circuit connecting body 112 can be used by the circuit connecting body 112 to press the battery contact surface 22a of the branch body 22 against the outer wall surface of the battery cell BC.

[0044] This busbar 110 may be molded as a single member having busbar body 111, circuit connector 112, and connector 113 (not shown), or busbar body 111 and connecting member 114 having circuit connector 112 and connector 113 may be molded as separate members, and busbar body 111 and connecting member 114 are fixed together by welding or the like to be integrated (FIG. 6). Here, busbar 110 made up of two parts is used, and connecting member 114 is molded in a crank shape having fixing portion 114a for fixing to busbar body 111.

[0045] As described above, the conductive module 2 of this modified example can increase the adhesion between the branch body 22 and the battery cell BC by using the bus bar 110 with spring properties, and therefore can improve the temperature measurement accuracy of the thermistor 30 connected to the mounting surface 22b of the branch body 22. Furthermore, the conductive module 2 of this modified example can prevent overload on the branch body 22 by using the spring properties of the bus bar 110, and can release stress acting on the bus bar 110. [Explanation of symbols]

[0046] 1,2 Conductive module 10,110 Bus bar 11,111 Busbar body 12,112 Circuit connector 12a, 112a Circuit connection part 12b,112b through hole 12c, 112c Hole periphery 13,113 Consolidated body 14,114 Connection parts 20 Wiring parts 21 Mainly wiring 22 Branched body 22a Battery contact surface 22b Mounting surface 23 First circuit conductor 24 Second circuit conductor 30 Thermistor 40 Sealing member BC Battery Cell BC2 electrode terminal BM Battery Module

Claims

1. a bus bar connected to one or a pair of battery cells of a battery module in which a plurality of battery cells are arranged; a wiring component that is formed flat and flexible and that includes a plurality of circuit conductors that are electrically connected to a battery monitoring unit that monitors the battery state of the battery cell; a thermistor for detecting the temperature of the battery cell; Equipped with the wiring component includes a wiring main body and branch bodies branched from the wiring main body for each of the plurality of bus bars and provided with battery contact surfaces that come into contact with outer wall surfaces of the battery cells; the busbar includes a busbar main body that is physically and electrically connected to an electrode terminal of the battery cell; a circuit connector that is physically and electrically connected to a first circuit conductor of the plurality of circuit conductors on a mounting surface of the branch body that is opposite to the battery contact surface; and a connector that connects the circuit connector to the busbar main body and presses the battery contact surface of the branch body against the outer wall surface of the battery cell via the circuit connector, The conductive module, wherein the thermistor is physically and electrically connected to a second circuit conductor among the plurality of circuit conductors on the mounting surface of the branch body.

2. The bus bar body, the circuit connector, and the coupling body are formed into a flat plate shape, 2. The conductive module according to claim 1, wherein the connecting body is arranged with a direction perpendicular to its plane inclined with respect to a direction perpendicular to the plane of the busbar body, and a pressing force for pressing the battery contact surface of the branch body against the outer wall surface of the battery cell is applied from the circuit connecting body to the mounting surface of the branch body by utilizing a spring property between the busbar body and the circuit connecting body.

3. The conductive module according to claim 1 or 2, characterized in that the bus bar is formed such that the bus bar body and a connection member having the circuit connector and the coupling body are each molded as separate members, and the bus bar body and the connection member are fixed together to form an integrated unit.

4. the circuit connection body has a through hole and a circuit connection portion provided on a peripheral portion of the through hole and configured to physically and electrically connect to the first circuit conductor on the mounting surface of the branch body, 3. The conductive module according to claim 1, wherein the thermistor is physically and electrically connected to the second circuit conductor in the through hole having the mounting surface of the branch body as its bottom surface, and an insulating distance is maintained between the thermistor and the peripheral edge of the hole by an insulating sealing material having a thermal conductivity higher than that of air filled in the through hole.

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