JP5167087B2 - Temperature detection module - Google Patents

Description

  The present invention relates to a temperature detection module that is mounted on a battery of an electric vehicle or the like and detects the temperature of each battery.

  FIG. 7 shows an embodiment of a conventional temperature detection module (see Patent Document 1).

  This temperature detection module 61 is applied to a high voltage battery 62 of an electric vehicle or a hybrid car, and is arranged in a strip shape along the side surface of each battery row 63 arranged horizontally, and each temperature sensor connected to a lead wire 65. 66, the surface temperature of each cylindrical unit cell 64 forming the battery array 63 is detected.

  The temperature sensor 66 is a PTC thermistor. The temperature sensor 66 contacts the cell 64 via a heat transfer sheet (not shown). Both ends of the lead wire 65 are connected to a temperature detection device (not shown).

  FIG. 8 shows another embodiment of the conventional temperature detection module (see Patent Document 1). On the upper surface 78a of each rectangular battery 78 arranged vertically, a resin portion 72, a metal body 73 for electric heating, and a heat transfer sheet. 74, the temperature sensor 75 is brought into close contact with each other. The temperature sensor 75 is pressed by a resin hook 76.

The resin part 72 is a part of the case 77 that partitions each battery 78 . In addition to the above, Patent Document 1 also describes that the temperature sensor 75 is arranged on the upper surface of the battery 78 through only the resin portion 72. The temperature sensor 75 is connected to a temperature detection device (not shown) via a lead wire.

  However, in the conventional temperature detection module 61 shown in FIG. 7, the temperature sensor 66 is closely attached to the surface of the battery 64 via a heat transfer sheet (not shown). The temperature sensor 66 is arranged so as to sandwich the temperature sensor 66, and the force for pressing the temperature sensor 66 against the battery 64 is likely to vary. When the pressure is strongly pressed, the temperature sensor 66 is damaged, and when it is weakly touched, the temperature detection accuracy is lowered. There was concern that it could be. Further, there is a concern that it is difficult to arrange the temperature sensors 66 at equal intervals in the longitudinal direction of the lead wire 65 with high positional accuracy.

  In the conventional temperature detection module 71 shown in FIG. 8, since the temperature sensor 75 is disposed via the resin portion 72 and the heat transfer metal body 73, the temperature detection accuracy may be lowered. There was concern.

  In view of the above points, the present invention can improve the temperature detection accuracy by pressing each temperature sensor against the surface of the battery with a contact pressure that does not cause damage and the like, and each temperature sensor is arranged with high positional accuracy. An object of the present invention is to provide a temperature detection module that can perform the above-described operation.

In order to achieve the above object, a temperature detection module according to claim 1 of the present invention includes a flexible flat circuit body that is bent into a wave shape so as to form a plurality of protrusions, and an inner surface at the tip of the protrusions. to a temperature sensor provided, which accommodates a projecting portion from one opening consists of an insulating cover having a respective housing portion to project to the outside tip end portion of the projecting portion from the other opening, leaving projecting The outer surface of the tip is brought into close contact with the power supply device by the force of only the elastic force of the protruding portion in a state where the outer surface of the tip is abutted against the power supply device and the tip side portion is elastically bent. .

  With the above configuration, the front end side of the protrusion of the flat circuit body abuts against the power supply device and bends elastically, so that the tip of the protrusion, that is, the temperature sensor is pressed by the elastic force of the flat circuit body itself and is elastic to the power supply device. Close contact with. The flat circuit body may be bent when assembled to the first cover, or may be bent before being assembled.

  A temperature detection module according to a second aspect is the temperature detection module according to the first aspect, wherein the flat circuit body is positioned on the cover by positioning means.

  With the above configuration, the flat circuit body is positioned on the cover by the positioning means, and the temperature sensor on the flat circuit body side is arranged in the housing portion of the cover without displacement. Examples of the positioning means include protrusions and holes that engage with each other. The positioning means can also serve as a fixing (locking) means. As another locking means, for example, the width direction both ends of the flat circuit body are locked by the claw portion of the cover.

  A temperature detection module according to claim 3 is the temperature detection module according to claim 1 or 2, wherein the power supply device is an assembled battery in which a plurality of cells are assembled, and each protrusion of the flat circuit body is provided for each cell. It touches.

  With the above configuration, the cover is arranged in a band shape in the cell arrangement direction, and each temperature sensor is accurately positioned in each housing portion of the cover for each cell. Since the temperature sensor contacts the cell via the thin flat circuit body, the surface temperature of the cell is accurately detected. One temperature detection module is arranged for each cell row.

  The temperature detection module according to claim 4 is the temperature detection module according to any one of claims 1 to 3, wherein a connecting portion that connects each housing portion of the cover has flexibility and absorbs misalignment. It is possible.

  With the above configuration, when the temperature detection module is assembled to the power supply device, even if the positions of the cover housing parts and the battery of the power supply device are shifted, the cover is extended or contracted in the longitudinal direction from the connecting portion, thereby causing the position shift. Is absorbed.

  According to the first aspect of the present invention, the temperature sensor is pressed against the power supply device by the elastic force of the flat circuit body, whereby the temperature sensor is prevented from being damaged and the temperature detection accuracy is improved.

  According to the second aspect of the present invention, since the long flat circuit body is positioned on the cover, the position of the temperature sensor is accurately defined, and the temperature detection accuracy is improved.

  According to the third aspect of the present invention, the temperature can be accurately measured for each cell of the assembled battery without any positional deviation.

  According to the fourth aspect of the present invention, each temperature sensor can be arranged in each battery of the power supply device without positional deviation, so that temperature detection accuracy is improved.

  1 to 3 show an embodiment of a temperature detection module according to the present invention.

  This temperature detection module 1 is made of a synthetic resin and has a long insulating cover 2 and a length that is arranged along the cover 2 and bent in a substantially wave shape that partially protrudes from the lower opening 6 (opening) of the cover 2. A flexible flat circuit body (hereinafter referred to as a flat circuit body) 4 and a temperature sensor 5 disposed on the protruding portion 7 of the flat circuit body 4.

  As shown in FIGS. 1 and 2, the downward protruding portion 7 of the flat circuit body 4 protruding from the lower opening 6 of the cover 2 is an upper surface of each rectangular battery (cell) 9 of the battery (power supply device or assembled battery) 8. 9a is pressed by the elastic force of the flat circuit body 4 itself and is in close contact. The elastic force of the flat circuit body 4 is not strong and contacts the battery 9 flexibly.

  The temperature sensor 5 is fixedly connected to the back surface (inner surface) of the protrusion 7 of the flat circuit body 4, and the temperature sensor 5 contacts the upper surface 9 a of the battery 9 via the thin flat circuit body 4. 1 and 2, for the sake of convenience, the flat circuit body 4 is shown in a position before being pressed, and the battery 9 is shown in a position after being pressed. Actually, the protruding portion of the flat circuit body 4 on the upper surface 9a of the battery 9 is shown. The projecting portion 7 bends upward while the lower surface (front surface) 7a of 7 is in contact.

  Since the temperature sensor 5 is arranged on the inner surface of the flat circuit body 4, it does not come into direct contact with the battery 9 and is not damaged. Also, since the flat circuit body 4 is thin, it contacts through the flat circuit body 4. However, there is no concern that the temperature detection accuracy will decrease. The protrusion 7 of the flat circuit body 4 is pressed against the battery 9 by its own elastic force, whereby the temperature sensor 5 on the inner surface side of the protrusion 7 is pressed toward the battery 9.

  As shown in FIG. 3, the cover 2 includes an accommodating portion 13 composed of inverted left and right wall portions 11 and inclined front and rear wall portions 12 via front and rear (longitudinal) directions via connecting portions 14 and 15. A plurality of them are continuously connected in a strip shape in series. A circuit body arrangement space 16 (FIG. 2) is formed by being surrounded by the front, rear, left and right walls 11, 12, and the space 16 communicates with the rectangular lower opening 6 and the upper opening 17, and the upper opening 17 is in the longitudinal direction of the cover. Is continued to the insertion space 18 (FIG. 2).

  The left and right wall portions 11 protrude above the front and rear wall portions 12 and the connecting portions 14 and 15, and the connecting portions 14 and 15 are integrally connected to the front and rear wall portions 12. The lower opening 6 is narrower in the front-rear direction than the upper opening 18. In addition, the front and rear, right and left directions in the specification are for convenience of explanation.

  A protrusion 19 for positioning the protruding portion 7 of the flat circuit body 4 is provided on the lower inner surface of the left and / or right side wall 11, and the protruding portion 7 gets over the protrusion 19 and protrudes downward to prevent upward return. Is done.

  As shown in FIG. 3, protrusions (positioning means) 20 for positioning the flat circuit body 4 are provided on the upper surfaces of the connecting portions 14 and 15 of the cover 2. Each protrusion 20 engages with each hole (positioning means) 21 of the flat circuit body 4, whereby the flat circuit body 4 is accurately positioned in the longitudinal direction.

  In this example, after the protrusion 20 is inserted into the hole portion 21, the flat circuit body 4 is fixed by being crushed like a rivet by heat caulking. 1 and 2 show a fixing portion 20 ′ in which the protrusion 20 is crushed.

  It is also possible to provide a circumferential groove (not shown) in the projection 20 without crushing the projection 20, and to fit the peripheral edge of the hole 21 of the flat circuit body 4 into the circumferential groove and fix it. Alternatively, a locking claw (not shown) is projected from the upper side wall 25 of the cover 2, and the side end of the flat circuit body 4 is engaged between the upper surface of the connecting portion 14 of the cover 2 and the locking claw. It is also possible to fix.

  One connecting portion 14 of the cover 2 is a horizontal plate-like connecting wall, and the other connecting portion 15 has a flexible portion 22. As shown in FIG. 4, the side walls 11 adjacent to the front and rear of the cover 2 are connected by thin flexible connecting pieces (flexible portions) 22 that are substantially U-shaped in side view. The connecting piece 22 is bent horizontally at the lower end side (the horizontal portion at the lower end side is indicated by reference numeral 22a) and continues to the central horizontal plate portion 23 in plan view.

  The connecting piece 22 continues to the side wall 11 at the horizontal portion 22b on the upper end side. A gap 24 is formed between the plate portion 23 and the inclined front and rear wall portions 12. Reference numeral 6 denotes a rectangular lower opening. As shown in FIG. 3, a short columnar protrusion 20 for fixing the body positioning is provided on the plate portion 23 and one connecting portion (connecting wall) 14. The displacement of the cover 2 in the longitudinal direction with respect to the battery 8 (FIG. 2) is absorbed by the flexible connecting portion 15. The connecting portion 15 can absorb not only the longitudinal direction but also the displacement in the bending and twisting directions.

  As shown in FIG. 3, a substantially U-shaped locking frame portion 31 is provided upward in place of the elongated side wall 25 at the point of the connecting portion 14 of the cover 2. The frame portion 31 engages with a claw portion 33 on the upper end side of the resin portion 32 of the battery 8 in FIG. 6, whereby the entire temperature detection module 1 including the cover 2 is accurately positioned on the battery 8.

  As shown in FIG. 3, the flat circuit body 4 is bent into a substantially trapezoidal wave shape. The bending operation is performed when the flat circuit body 4 having a flat initial shape and a belt shape is assembled to the cover 2. As shown in FIG. 3, the flat circuit body 4 can be bent in a wave shape in advance and then assembled to the cover 2.

  The top surface 34 of the upper crest portion of the flat circuit body 4 is formed wider in the front-rear direction than the lower trough portion, that is, the bottom surface 7 a of the protruding portion 7. A circular hole 21 for positioning is provided in a horizontal wall portion (substitute with reference numeral 34) forming the top surface, and a temperature sensor is provided in a horizontal wall section (substitute with reference numeral 7a) forming the bottom of the lower projection 7 5 is provided. The corrugated flat circuit body 4 is constituted by the upper and lower wall portions 34, 7a and the front and rear inclined wall portions 7b connecting the upper and lower wall portions 34, 7a in the longitudinal direction. The temperature sensor 5 is, for example, a PTC thermistor, and a rectangular one is connected and fixed to the circuit of the flat circuit body 4 by soldering.

As shown in FIG. 2, the upper wall portion 34 of the flat circuit body 4 is in contact with the upper surfaces of the connecting portions 14 and 15 of the cover 2, and the inclined walls 7 b before and after the flat circuit body 4 are the inner surfaces of the inclined walls 12 before and after the cover 2. To touch.

  FIG. 5 shows an example of the circuit configuration of the flat circuit body 4. Two printed circuits 36 and 37 are formed on a thin sheet 35 made of insulating resin, one circuit 36 is continuous in the longitudinal direction of the insulating sheet 35, and the other circuit 37 connects the electrodes 5 a of each temperature sensor 5 in series. Connected to. Positioning holes 21 are provided in the insulating sheet 35 between the temperature sensors 5. Each of the circuits 36 and 37 is connected to a circuit on the temperature detection device (not shown) side through a metal terminal (not shown) at a terminal portion of the insulating sheet 35.

  As shown in FIGS. 1 and 2, the flat circuit body 4 is bent and wired along the cover 2, and the tip end portion (the portion having the temperature sensor 5 inside) 7a of the projection 7 of the flat circuit body 4 is provided. Protrudes outward from the lower opening 6 of the housing portion 13 of the cover 2, the tip end portion 7 a is prevented from reversing by a horizontal projection 19 in the housing portion 13, and the upward projection 20 of the cover 2 is a hole of the flat circuit body 4. The flat circuit body 4 is positioned through the portion 21.

  The battery 8 includes vertical rectangular batteries 9 arranged in parallel in the front-rear direction, and an insulating vertical resin plate 45 arranged between the batteries 9. The upper end surface 45 a of the resin plate 45 protrudes above the upper end surface 9 a of the battery 9.

  By mounting the temperature detection module 1 on the battery 8, the protrusion 7 of the flat circuit body 4 abuts on the upper surface 9 a of the battery 9 and elastically bends upward, and the temperature sensor 5 is adjusted to an upper surface of the battery 9 with an appropriate pressure. Press against the 9a side. The force with which the protrusion 7 of the flat circuit body 4 pushes the temperature sensor 5 is appropriately set by changing the wrapping margin between the temperature sensor 5 and the protrusion 7 at the initial position.

  In a state where the temperature detection module 1 is mounted on the battery 8, the upper surface 45 a of the resin plate 45 of the battery 8 is positioned to face the lower surfaces of the connecting portions 14 and 15 of the cover 2 with a gap 46 therebetween. Since the resin plate 45 and the cover 2 are positioned in a non-contact manner with the gap 46 therebetween, for example, occurrence of condensation is prevented, and concerns such as a short circuit of the flat circuit body 4 and the temperature sensor 5 due to condensation are avoided. .

  FIG. 6 shows a state in which the temperature detection module 1 is mounted on the battery 8, and the temperature detection module is obtained by engaging the frame portion 31 of the cover 2 with the claw portion 33 of the horizontal resin portion 32 of the battery 8. 1 is positioned and fixed to the battery 8.

  In FIG. 6, reference numeral 47 denotes a battery pole column, 45 denotes a vertical resin plate between the batteries, and 48 denotes an outer case of the battery 8. The temperature detection module 1 is linearly arranged in the direction in which the batteries 9 are arranged. A bus bar module (not shown) is mounted on the upper side of the battery 8, and the pole column 47 of each battery 9 is connected in series with a bus bar (not shown) made of a conductive metal plate.

  Although the batteries 8 are arranged in a row in FIG. 6, they are actually arranged in two rows and connected in series, and one temperature detection module 1 is also arranged for each battery 8. In the bus bar module, a bus bar having two holes into which two pole columns 47 are inserted is arranged in parallel with an insulating resin plate.

  In the above embodiment, the temperature detection module 1 is arranged on the upper surface of the battery 8, but the temperature detection module 1 may be arranged on the side surface of the battery 8 as shown in FIG. Moreover, in the said embodiment, although the assembled battery 8 which assembled the some battery (cell) 9 was used as a battery (power supply device), it is also possible to apply the said temperature detection module 1 to other power supply devices. It is.

It is a side view which shows one Embodiment of the temperature detection module which concerns on this invention. It is a longitudinal cross-sectional view which similarly shows a temperature detection module. It is a disassembled perspective view which similarly shows a temperature detection module. An example of the connection part of the cover of a temperature detection module is shown, (a) is a side view, (b) is a top view. It is a top view which shows an example of the flat circuit body of a temperature detection module. It is a perspective view which shows the state which mounted | wore the temperature detection module with the battery. It is a top view which shows one form of the conventional temperature detection module. It is a longitudinal cross-sectional view which shows the other form of the conventional temperature detection module.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Temperature detection module 2 Cover 4 Flat circuit body 5 Temperature sensor 6 Opening 7 Protrusion part 8 Battery (power supply device)
9 Battery (cell)
13 accommodating part 15 connecting part 20 protrusion (positioning means)
21 hole (positioning means)

Claims (4)

A flexible flat circuit member which is bent into a wave shape so as to form a plurality of protrusions, and a temperature sensor provided in the distal end inner surface of the projecting portion, the projecting portion to accommodate the projecting portion from one opening is configured with a distal portion in an insulating cover having a respective housing portion to project to the outside from the other opening, the distal end side portion flexed elastically abutted against the front end outer surface of the projecting portion to the power supply In this state, the temperature detection module is characterized in that the outer surface of the tip is brought into close contact with the power supply device with only the elastic force of the protrusion.   The temperature detection module according to claim 1, wherein the flat circuit body is positioned on the cover by positioning means.   3. The temperature detection module according to claim 1, wherein the power supply device is an assembled battery in which a plurality of cells are assembled, and each protrusion of the flat circuit body is in contact with each cell.   The temperature detection module according to any one of claims 1 to 3, wherein a connecting portion that connects each housing portion of the cover has flexibility and can absorb misalignment.

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