JP2013097894A - Battery wiring module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery wiring module capable of protecting a flexible printed wiring board, and capable of reliably detecting the temperature of a single cell.SOLUTION: A battery wiring module 13 which is attached to a single cell group 12 including a plurality of single cells 11 each having positive and negative electrode terminals 14, comprises: a resin protector 16 made of a synthetic resin; an FPC 17 disposed on the resin protector 16; an extension piece 30 extended from a side edge of the FPC 17 and routed toward the single cell 11; and a thermistor 29 attached to the extension piece 30 and brought into contact with the single cell 11 to detect the temperature of the single cell 11. The resin protector 16 includes a pressing part 59 for pressing on the extension piece 30 and the thermistor 29 toward the single cell 11 to bring the thermistor 29 into contact with the single cell 11.

Description

  The present invention relates to a battery wiring module.

  Conventionally, the thing of patent document 1 is known as a battery wiring module attached to the cell group provided with the some cell which has a positive electrode and a negative electrode. This battery wiring module includes a synthetic resin resin protector, a flexible printed circuit board (hereinafter sometimes referred to as FPC) disposed on the resin protector, and a thermistor mounted on the FPC.

  The resin protector includes a biasing member that elastically biases the thermistor and the FPC toward the single cell. The biasing member is in direct contact with the thermistor. When the thermistor is urged toward the unit cell by the urging member, the temperature of the unit cell is detected by the thermistor.

JP 2009-276071 A

  However, according to the above configuration, the urging member presses the FPC. Then, there is a concern that an excessive force is applied to the FPC. The FPC includes a film made of an insulating synthetic resin and a conductive path made of a metal foil formed on the film. When an excessive force is applied to the FPC, there is a concern that the film may be deformed or a problem such as breakage of the conductive path may occur.

  In the prior art, the thermistor is in direct contact with the urging member, and the FPC is interposed between the thermistor and the single cell. For this reason, it is the temperature of the urging member that the thermistor directly detects, and the temperature of the unit cell can only be indirectly detected through a film made of synthetic resin and a conductive path made of metal foil. . For this reason, there existed a problem that the temperature of a cell could not be detected reliably depending on the prior art.

  This invention is completed based on the above situations, Comprising: It aims at providing the wiring module for batteries which protects a flexible printed circuit board and detects the temperature of a single cell reliably.

  The present invention is a battery wiring module that is attached to a unit cell group including a plurality of unit cells each having a positive electrode electrode and a negative electrode terminal. The resin protector is made of a synthetic resin, and is disposed in the resin protector. A flexible printed circuit board; an extended piece extending from a side edge of the flexible printed circuit board and routed toward the single battery; and the single battery attached to the extended piece and in contact with the single battery. A temperature detection unit that detects the temperature of the battery, and the resin protector includes a pressing unit that presses the extension piece and the temperature detection unit against the unit cell to bring the temperature detection unit into contact with the unit cell. .

  According to the present invention, since it is the extension piece and the temperature detection part that are pressed by the pressing part, the flexible printed circuit board does not receive the force from the pressing part. Thereby, a flexible printed circuit board can be protected.

  Moreover, according to this invention, a temperature detection part is pressed toward a press part. Thereby, the temperature of a cell can be detected reliably.

As embodiments of the present invention, the following embodiments are preferable.
The pressing portion is preferably formed to protrude slightly from the resin protector toward the unit cell, and the temperature detection unit is preferably disposed between the pressing unit and the unit cell.

  According to said aspect, in the state in which the resin protector was attached to the cell group, the temperature detection part is reliably contacted with a cell by being pinched | interposed between a cell and a press part. Thereby, the temperature of a cell can be detected reliably.

  The extension piece is preferably formed in a strip shape along a side edge of the flexible printed circuit board and then bent at a right angle.

  According to the above aspect, the extension piece can be formed by a simple method of bending the extension piece formed in an elongated strip shape along the side edge of the flexible printed board at a right angle. Moreover, since the area required for producing one flexible printed circuit board can be made small compared with the case where the extending piece is extended at right angles from the side edge of the flexible printed circuit board, the yield is improved. be able to.

  The resin protector is formed with a housing portion for housing the flexible printed circuit board, and the resin protector is formed with a guide portion for guiding the extended piece led out from the housing portion to the pressing portion. Preferably it is.

  According to the above aspect, the extension piece is led out from the housing portion and guided to the pressing portion by the guide portion. Thereby, since the temperature detection means is reliably pressed by the unit cell by the pressing part, the temperature of the unit cell can be detected reliably.

  The flexible printed circuit board has a mounting surface on which an electronic component and the temperature detection unit are mounted. In a state where the resin protector is attached to the single battery group, the electronic component is connected to the flexible printed circuit board. It is preferable that the temperature detection unit is disposed on the side opposite to the battery, and the temperature detection unit is disposed on the unit cell side with respect to the extension piece by bending the extension piece.

  According to said aspect, an electronic component and a temperature detection part can be mounted in the same process with respect to the mounting surface of a flexible printed circuit board. Furthermore, since the temperature detection unit and the single cell can be brought into direct contact with each other, the temperature of the single cell can be detected more reliably.

  The flexible printed circuit board is preferably formed with lands that are electrically connected to the electrode terminals and detect the voltage of the unit cells.

  According to said aspect, since the voltage of a cell can be detected with the land formed in the flexible printed circuit board, it is not necessary to wire the electric wire for voltage detection separately. Thereby, the wiring module for batteries can be reduced in size.

  The resin protector preferably contains a connection member that connects the electrode terminals of the different cells.

  According to said aspect, the electrode terminal of a different cell can be electrically connected by attaching a resin protector to a cell group.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to protect a flexible printed circuit board, the temperature of a cell can be detected reliably.

FIG. 1 is an exploded perspective view showing a battery module according to an embodiment of the present invention. FIG. 2 is a plan view showing the battery module. FIG. 3 is a perspective view showing the FPC. FIG. 4 is a plan view showing the FPC. FIG. 5 is a schematic view showing a wiring form such as a conductive path. FIG. 6 is a perspective view showing a two-hole bus bar. FIG. 7 is a plan view showing a two-hole bus bar. FIG. 8 is a perspective view showing a one-hole bus bar. FIG. 9 is a plan view showing a one-hole bus bar. FIG. 10 is a perspective view showing an FPC on which a bus bar and electronic components are mounted. FIG. 11 is a plan view showing an FPC on which bus bars and electronic components are mounted. FIG. 12 is a side view showing an FPC on which a bus bar and electronic components are mounted. FIG. 13 is a perspective view showing the connecting unit. FIG. 14 is a plan view showing the connecting unit. FIG. 15 is a side view showing the connecting unit. FIG. 16 is a plan view showing a state in which an FPC with a bus bar or the like is accommodated in a resin protector. FIG. 17 is a bottom view showing a state in which an FPC with a bus bar or the like is accommodated in a resin protector. FIG. 18 is a perspective view showing a state in which an FPC with a bus bar or the like attached is accommodated in a resin protector as viewed from the front side. FIG. 19 is a perspective view showing a state where an FPC with a bus bar or the like attached is accommodated in a resin protector as seen from the back side. FIG. 20 is a plan view showing a battery wiring module. FIG. 21 is a perspective view showing a state in which the battery wiring module is viewed from the front side. FIG. 22 is a perspective view showing a state in which the battery wiring module is viewed from the back side. FIG. 23 is an enlarged side view showing the pressing portion. FIG. 24 is an enlarged perspective view showing the pressing portion. FIG. 25 is a side view showing the battery wiring module. FIG. 26 is a plan view showing an FPC according to another embodiment of the present invention.

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS. The battery module 10 according to the present embodiment is used as a drive source of a vehicle (not shown) such as an electric vehicle or a hybrid vehicle. As shown in FIG. 1, the battery module 10 includes a unit cell group 12 in which a plurality (14 in this embodiment) of unit cells 11 are arranged side by side, and a plurality of unit cells 11 attached to the unit cell group 12. And a battery wiring module 13 for connecting the two. In the following description, the upper side of FIG. 1 is the upper side, and the lower side is the lower side.

(Single cell group 12)
As shown in FIG. 1, the unit cell 11 has a flat and substantially rectangular parallelepiped shape, and a power generation element (not shown) is accommodated therein. On the upper surface of the unit cell 11, a pair of electrode terminals 14, 14 are formed projecting upward at positions close to both ends. One of the pair of electrode terminals 14 and 14 is a positive electrode, and the other is a negative electrode. A thread is formed on the outer peripheral surface of the electrode terminal 14. The positive and negative directions of the unit cells 11 are opposite to each other in the unit cells 11 adjacent to each other, whereby the electrode terminals 14 having different polarities are adjacent to each other. The electrode terminal 14 is fastened with a nut (not shown) with a bus bar 15 (an example of a connection member) accommodated in the battery wiring module 13 interposed therebetween. Although not shown in detail, the plurality of single cells 11 are fixed by known fixing means such as a holding plate.

(Battery wiring module 13)
As shown in FIG. 2, elongated battery wiring modules 13 are arranged on the upper surface of the unit cell group 12 along the arrangement direction of the unit cells 11.

  The battery wiring module 13 is roughly a resin protector 16 that holds a plurality of bus bars 15 that connect the electrode terminals 14, and a flexible printed circuit board 17 (hereinafter simply referred to as an FPC 17) that is held by the resin protector 16. It has. As will be described later, two resin protectors 16 are arranged in parallel to each other, while the FPC 17 is formed in a U-shape.

(FPC17)
First, the FPC 17 will be described. As shown in FIGS. 3 and 4, the FPC 17 has a structure in which a conductive path 18 (see FIG. 5) is formed on one surface or both surfaces of an insulating base film made of a polyimide film, a liquid crystal film, or the like by a printed wiring technique. It is.

  As a whole, the FPC 17 is formed in a U-shape in which one end portions of the first FPC band 19 and the second FPC band 20 arranged in two rows are connected by a connecting portion 56.

  In the first FPC band 19 (upper side in FIG. 4), the conductive path 18 is formed only on the back surface. On the other hand, the second FPC band 20 (lower side in FIG. 4) has conductive paths 18 formed on both the back surface and the front surface. Therefore, the surface of the second FPC band 20 is a mounting surface 21 on which the electronic component 23 and the like are mounted. Further, the conductive path 18 formed on the back surface of the first FPC band 19 and the second FPC band 20 is electrically connected to a bus bar 15 to be described later, and detects voltage of the unit cell 11 at the electrode terminal 14. The path 22 is used.

  The first FPC band 19 is equally divided into seven unit regions 24A along the length direction. The length of each unit region 24A is approximately equal to the combined thickness of two adjacent unit cells 11. Between the adjacent unit regions 24A, a surplus length absorbing portion 25 that performs a surplus length absorbing function is bulged downward.

  The second FPC band 20 is divided into six unit areas along the length direction. Here, the four unit areas 24B in the central portion are the same as the unit area 24A of the first FPC band 19, and two unit cells 11 are provided. The two unit regions 24 </ b> C at both ends have a length corresponding to the thickness of three unit cells 11. Between the adjacent unit regions 24B and 24C, a surplus length absorbing portion 25 that similarly performs a surplus length absorbing function is bulged downward.

  In the first FPC band 19 and the second FPC band 20, the unit regions 24A, 24B, and 24C are arranged with a pitch shifted by one unit cell 11.

  In the following description, when the unit regions 24A, 24B, and 24C are described in common, they may be described as the unit region 24.

  On the back surfaces of the first FPC band 19 and the second FPC band 20, as will be described in detail later, a reinforcing plate 26 integrally formed with the bus bar 15 is fixed for each unit region 24. The bus bar 15 also functions as a detection terminal that takes in information related to the voltage of the unit cell 11. On the back surfaces of the first FPC band 19 and the second FPC band 20, as schematically shown in FIG. 5, lands 27 and voltage detection conductive paths 22 led out from the lands 27 are formed for each unit region 24. The reinforcing plate 26 of the bus bar 15 is electrically connected to the land 27.

  In each unit region 24, as shown in the figure, a land 27 and a plurality of copper foils 28 different from the voltage detection conductive path 22 connected to the land 27 are connected to the land 27 and the voltage detection conductive path. 22 is formed in an electrically insulated form. Further, a copper foil 28 different from the voltage detection conductive path 22 is also formed in the surplus length absorbing portion 25.

  As shown in FIG. 10, the electronic component 23 is connected to the conductive path 18 on the surface of the second FPC band 20 by a known method such as reflow soldering, for example, for each unit region 24B, 24C. ing. The electronic component 23 includes a CPU 23A. A CPU 23 </ b> A is connected to the voltage detection conductive path 22 connected to the land 27. The CPU 23 </ b> A detects the voltage of the unit cell 11 from the information regarding the voltage of the unit cell 11 acquired via the bus bar 15.

  The bus bar 15 and the CPU 23 </ b> A are connected by a voltage detection conductive path 22. The CPU 23A acquires the voltage value of the single battery 11 from the bus bar 15 and monitors whether or not the voltage of the single battery 11 is within a predetermined normal value.

  An extension piece 30 extending from the inner edge is formed in one unit region 24B at the center of the second FPC band 20 and two unit regions 24C at both ends. The extended piece 30 was formed by bending a strip that was cut in the shape of an elongated band along the inner edge of the unit region 24 at a right angle with respect to the direction in which the FPC 17 extends, and then its tip was bent into a U shape. It has a shape. A thermistor 29 (an example of a temperature detection unit) is attached to the lower surface (the surface on the unit cell 11 side) of the distal end portion of the extension piece 30 (see FIG. 12). The thermistor 29 functions to directly contact the corresponding unit cell 11 to detect the temperature of the unit cell 11 and to transmit the temperature detection signal to the CPU 23 </ b> A via the conductive path 18. The CPU 23A monitors whether or not the temperature of the unit cell 11 acquired from the thermistor 29 is within a predetermined normal value.

  A connector portion 32 connected to an external ECU (not shown) is attached to the free end of the second FPC band 20. The connector part 32 is connected to the CPU 23 </ b> A via the conductive path 18. The CPU 23A acquires information from the external ECU, and transmits information related to the single battery 11 such as the voltage of the single battery 11 and the temperature of the single battery 11 to the external ECU.

(Bus bar 15)
Next, the bus bar 15 that connects the electrode terminals 14 of the adjacent unit cells 11 will be described. As described above, the bus bar 15 also functions as a detection terminal that detects a voltage on the unit cell group 12 side. The bus bar 15 is formed by pressing a metal plate such as copper, a copper alloy, or stainless steel (SUS). The bus bar 15 includes two types of bus bars 15 including 13 two-hole bus bars 15A and two one-hole bus bars 15B.

  As shown in FIGS. 6 and 7, the two-hole bus bar 15A has a long planar rectangle in which two terminal insertion holes 33 into which the electrode terminals 14 of the unit cell 11 are inserted are opened at a predetermined interval. A main body 34A is provided. On the other hand, as shown in FIGS. 8 and 9, the 1-hole bus bar 15 </ b> B includes a main body portion 34 </ b> B that is a long planar rectangle having a single terminal insertion hole 33 through which the electrode terminal 14 of the unit cell 11 is inserted. I have.

  Reinforcing plates 26A and 26B are integrally formed on the bus bars 15A and 15B. Taking the two-hole bus bar 15A as an example, the reinforcing plate 26A is formed in a stepped shape on one side edge side of the main body portion 34A via the vertical portion 35A. The reinforcing plate 26 </ b> A is formed in a planar rectangle that hits almost the entire back surface of the unit region 24 </ b> A of the first FPC band 19 and the unit region 24 </ b> B of the second FPC band 20. The unit area 24C at both ends of the second FPC band 20 corresponds to a 2/3 area.

  In the 1-hole bus bar 15B, the reinforcing plate 26B is also formed in a stepped shape that rises one step on the one side edge side of the main body portion 34B via the vertical portion 35B. The reinforcing plate 26B of the 1-hole bus bar 15B is formed to be short like the main body portion 34B, and hits the remaining 1/3 of the unit area 24C at both ends of the second FPC band 20.

  Positioning through holes 36 are formed at positions substantially corresponding to the four corners of the reinforcing plates 26A and 26B of both bus bars 15A and 15B. Note that each unit region 24 of the FPC 17 is also formed with a through hole 37 aligned with the through hole 36 of the reinforcing plates 26A and 26B.

  In the peripheral portions of the reinforcing plates 26A and 26B of the bus bars 15A and 15B, an entrance hole 38 that allows entry of an adhesive, which will be described later, is appropriately opened.

(Resin protector 16)
As described above, the resin protectors 16 are arranged in parallel with each other so as to correspond to the first FPC band 19 and the second FPC band 20 constituting the two sides of the FPC 17.

  Among the resin protectors 16, the first resin protector 16 </ b> A located on the upper side in FIG. 2 includes seven connecting units 39 </ b> A so as to correspond to the unit region 24 </ b> A of the first FPC band 19.

  Further, the second resin protector 16B located on the lower side of FIG. 2 among the resin protectors 16 is composed of six connecting units 39B so as to correspond to the unit regions 24B and 24C of the second FPC band 20. Here, the four connecting units 39B in the central part have the same length as the connecting unit 39A constituting the first resin protector 16A, whereas the two connecting units 39C at both ends are unit The entire region 24C is formed corresponding to the region 24C.

  The basic structure of the connecting unit will be described by taking the connecting unit 39B disposed in the center of the second resin protector 16B as an example.

  As shown in FIGS. 13 to 15, the connecting unit 39 </ b> B includes a main body housing portion 40 </ b> B that houses the main body portion 34 </ b> A in the 2-hole bus bar 15 </ b> A, and an FPC housing portion 41 </ b> B (an example of a housing portion) that houses the FPC 17. Are formed side by side, and a cover 42 </ b> B covering the upper surface of the FPC housing portion 41 </ b> B is formed on the side edge of the FPC housing portion 41 </ b> B through a hinge 43 so as to be swingable.

  The main body accommodating portion 40B is formed in a box shape in which the main body 34A of the two-hole bus bar 15A can be tightly inserted from above, and two terminals of the main body 34A are provided on the bottom surface of the main body accommodating portion 40B. Two window holes 44 are formed to open the formation position of the insertion hole 33 to the outside. A locking claw 45 is formed on the side wall of the main body portion accommodating portion 40B opposite to the FPC accommodating portion 41B so as to be locked at the central portion in the length direction at one side edge of the main body portion 34A.

  The FPC housing part 41B is formed so as to project laterally from a substantially central height position of the side wall in the main body housing part 40B. Therefore, the upper side of the side wall is cut off. The reinforcing plate 26 of the bus bar 15 is placed on the lower side of the FPC 17 in the FPC accommodating portion 41B. Pins 46 are erected at the four corners of the FPC accommodating portion 41B, and the pins 46 can pass through the through holes 36 and 37 that are aligned with each other and are opened in alignment with the reinforcing plates 26A and 26B and the FPC 17. ing.

  A pair of connecting pieces 47 project from the front edge (left side in FIG. 14) of the front and rear edges of the FPC housing portion 41B, and the connecting piece 47 extends from the rear edge (right side in FIG. 14). A receiving portion 48 is formed for slidably receiving the.

  The cover 42B is formed in a size that can cover the entire upper surface of the FPC housing portion 41B. On the back surface of the cover 42B, a shallow relief recess 49 is formed at the center of the cover 42B for fitting and releasing the electronic component 23 mounted on the surface of the FPC 17, and a pressing rib 50 is formed around the relief recess 49.

  A pair of lock pieces 51 are formed at both ends of the edge on the swing end side of the cover 42B so as to protrude to the back side, while lock pieces 51 are formed at both ends of the side wall of the main body housing portion 40B. A lock portion 52 that is elastically locked is provided. Further, at the four corners of the back surface of the cover 42B, fitting holes 53 into which the tips of the pins 46 standing at the four corners of the FPC housing portion 41B are fitted are formed.

  As shown in FIG. 18, the connecting unit 39C disposed on the free end side of the second resin protector 16B includes a main body portion accommodating portion 40C having a main body portion 34A in the two-hole bus bar 15A and a main body portion 34B in the one-hole bus bar 15B. It has a shape that can be accommodated in isolation. The FPC accommodating portion 41C is formed in a shape on which the reinforcing plate 26A of the 2-hole bus bar 15A and the reinforcing plate 26B of the 1-hole bus bar 15B, which are lined on the unit region 24C on the free end side in the second FPC band 20, can be placed. Further, a connector portion placement portion 54 on which the free end of the second FPC band 20 provided with the connector portion 32 can be placed is formed to extend.

  The cover 42 </ b> C is formed in a size that can cover the entire upper surface of the FPC housing portion 41 </ b> C, and a protective cover 55 that covers the connector portion 32 is integrally formed.

  In the connection unit 39D arranged on the connection end side of the second resin protector 16B, the main body accommodating portion 40D can accommodate the main body portion 34A in the two-hole bus bar 15A and the main body portion 34B in the one-hole bus bar 15B. On the other hand, the FPC housing portion 41D is provided with a reinforcing plate 26A of the 2-hole bus bar 15A and a reinforcing plate 26B of the 1-hole bus bar 15B that are lined on the unit region 24C on the connection end side in the second FPC band 20. The connecting portion mounting portion 57 is formed so as to extend and has an end portion of the connecting portion 56 between the first FPC band 19 and the second FPC band 20. The cover 42 </ b> D is formed in a size that can cover the entire upper surface from the FPC housing part 41 </ b> D to the connecting part mounting part 57.

  Both the connecting units 39C and 39D are the same as the above-described connecting unit 39B in other shapes.

  The seven connecting units 39A constituting the first resin protector 16A have a basic structure such as a main body accommodating portion 40A, an FPC accommodating portion 41A, and a cover 42A, and the like, in the central portion of the second resin protector 16B described above. It is the same as the connection unit 39B. The connecting unit 39A constituting the first resin protector 16A has no escape recess 49 formed on the back surface of the cover 42A, and a pressing rib 50 is formed over almost the entire back surface. In this configuration, the connecting unit 39A constituting the first resin protector 16A is different from the connecting unit 39B at the center of the second resin protector 16B.

  Now, as shown in FIG.22 and FIG.23, the groove | channel which hold | maintains the extended piece 30 extended from FPC accommodating part 41A-41D in the outer surface of main-body part accommodating part 40A-40D in each connection unit 39A-39D. A holding portion 58 having a shape is formed. The extension piece 30 is held at a predetermined position by the holding portion 58 by sandwiching the tip of the extension piece 30 in the holding portion 58.

  Further, as shown in FIGS. 23 and 24, the thermistor 29 mounted on the extension piece 30 is pressed toward the unit cell 11 on the outer surface of the main body housing portions 40A to 40D in each of the connection units 39A to 39D. A pressing part 59 is formed. The pressing portion 59 is formed in a rib shape protruding from the outer surface of the main body housing portions 40A to 40D, and has a substantially U shape when viewed from the side. The lower surface of the pressing portion 59 is formed so as to slightly protrude downward (on the unit cell 11 side) from the lower surfaces of the connection units 39A to 39D. On the lower surface of the pressing portion 59, a detachment prevention projection 60 that protrudes downward and prevents the thermistor 29 from detaching from the pressing portion 59 is formed. The protrusion height dimension of the release prevention protrusion 60 from the lower surface of the pressing portion 59 is set smaller than the height dimension of the thermistor 29. The pressing portion 59 is formed to be elastically deformable in the vertical direction.

  On the outer surface of the main body housing portions 39A to 39D, a guide portion 61 having a groove shape for guiding the extending piece 30 led out from the FPC housing portions 41A to 41D to the pressing portion 59 is formed. The guide part 61 is formed in a groove shape along the outer surface of the main body part accommodating parts 39A to 39D. The extension piece 30 is guided to the pressing portion 59 by sandwiching the extension piece 30 inside the guide portion 61. On the inner wall of the guide portion 61, a detachment prevention portion 62 that suppresses the extension piece 30 from escaping upward from the guide groove is formed to protrude inward.

  As shown in FIG. 25, the thermistor 29 is arranged on the unit cell 11 side (lower side) with respect to the extended piece 30 in a state where the extended piece 30 is held by the pressing portion 59. . Thus, the thermistor 29 is in direct contact with the upper surface of the unit cell 11 with the battery wiring module 13 attached to the unit cell group 12. FIG. 25 shows a state of the pressing portion 59 in a state before the battery wiring module 13 is attached to the single cell group 12. In FIG. 25, the position of the upper surface of the unit cell 11 in a state where the battery wiring module 13 is attached to the unit cell group 12 is indicated by an imaginary line (two-dot chain line).

  In a state where the battery wiring module 13 is attached to the unit cell group 12, the upper surface of the unit cell 11 contacts the thermistor 29 from below and presses the thermistor 29 upward. Thereby, the pressing part 59 is pressed upward via the thermistor 29 and the extension piece 30, and is elastically deformed upward. As a result, a downward elastic force is generated in the pressing portion 59, and the thermistor 29 comes into close contact with the upper surface of the unit cell 11 by this elastic force.

(Assembly procedure)
An example of the assembly procedure of the battery module 10 according to the present embodiment will be described. As shown in FIG. 1, the unit cell group 12 is formed by arranging the 14 unit cells 11 shown in the figure so that the adjacent unit cells 11 are stacked in the opposite direction.

  On the other hand, as shown in FIG. 3, a U-shaped FPC 17 is formed in which the first FPC band 19 and the second FPC band 20 are connected by a connecting portion 56, and the surface of the second FPC band 20 is formed as shown in FIG. 10. The electronic component 23 including the CPU 23A and the thermistor 29 is mounted by reflow soldering in the same process. In addition, the connector part 32 is also attached. Then, after being cut out from the second FPC band 20, it is bent to form the extended piece 30 having a predetermined shape.

  Reinforcing plates 26A and 26B are attached to the FPC 17 on which the electronic component 23 and the like are mounted as described above. In the first FPC band 19, the reinforcing plate 26A of the two-hole bus bar 15A is attached to the back surface of the seven unit regions 24A. More specifically, after the conductive adhesive is applied to the entire back surface of the unit region 24A, the reinforcing plate 26A is in a posture in which the main body portion 34A of the two-hole bus bar 15A faces the inner side (the second FPC band 20 side). The through holes 36 and 37 are pasted by being pressed against the back surface of the corresponding unit region 24A while being aligned.

  In the second FPC band 20, the reinforcing plate 26 </ b> A of the two-hole bus bar 15 </ b> A is attached to the entire surface of the back surface of the four unit regions 24 </ b> B at the center through a conductive adhesive in the same manner as described above. On the back surfaces of the unit regions 24C at both ends, the reinforcing plate 26A of the two-hole bus bar 15A and the reinforcing plate 26B of the one-hole bus bar 15B are arranged on the inside and outside at intervals, and the entire surface is also put through the conductive adhesive. Is pasted. As described above, the FPC 17 to which the bus bar 15 is integrally attached is formed.

  On the other hand, the seven connecting units 39A are connected to the connecting piece 47 while being inserted into the receiving portion 48, whereby the first resin protector 16A is formed, and the four connecting units 39B are connected between the connecting units 39C and 39D. Similarly, the second resin protector 16B is formed by connecting and connecting the connecting piece 47 through the receiving portion 48 in the same manner. The first resin protector 16A and the second resin protector 16B are arranged in parallel with each other at a predetermined interval.

  From this state, the FPC 17 is accommodated in the resin protectors 16A and 16B. Specifically, the main body portions 34A and 34B of the bus bars 15A and 15B attached to the FPC 17 are pushed down to the bottom portions of the main body housing portions 40A to 40D of the corresponding connecting units 39A to 39D and are prevented from being detached by the locking claws 45. . At the same time, the reinforcing plates 26A and 26B of the bus bars 15A and 15B and the FPC 17 to which the reinforcing plates 26A and 26B are attached are inserted through the through holes 36 and 37 through the pins 46 erected on the FPC housing portion 41. It is mounted on the FPC accommodating parts 41A-41D.

  Subsequently, the extending piece 30 formed on the side edge of the FPC 17 is led out from the FPC housing portion 41 and sandwiched inside the guide portion 61. Next, the extension piece 30 and the thermistor 29 are arranged on the lower surface of the pressing portion 59 in a posture in which the thermistor 29 is positioned on the opposite side of the pressing portion 59 with respect to the extension piece 30. Further, the extension piece 30 is held by sandwiching the end of the extension piece 30 inside the holding portion 58.

  The covers 42 </ b> A to 42 </ b> D are closed while being positioned by fitting the tips of the pins 46 into the fitting holes 53 on the back surface. When the covers 42 </ b> A to 42 </ b> D are properly closed, the lock pieces 51 are engaged with the lock portions 52 of the counterpart and closed. Locked to.

  As a result, the battery wiring module 13 is formed as a finished product in a form in which the surfaces of the first FPC band 19 and the second FPC band 20 and the upper surface of the connector portion 32 are covered.

  As shown in FIG. 1, the battery wiring module 13 formed as described above is put on a predetermined position on the upper surface of the unit cell group 12 and is inserted into the terminal insertion holes 33 of the two-hole bus bar 15 </ b> A and the one-hole bus bar 15 </ b> B. The electrode terminals 14 and the bus bars 15 are connected by inserting the corresponding electrode terminals 14 of the unit cell 11 and screwing the nuts to the respective electrode terminals 14 and tightening them.

  By tightening a nut on each electrode terminal 14, the battery wiring module 13 receives a force in a direction approaching the unit cell 11. Then, as shown in FIG. 25, the pressing portion 59 is pressed upward from the upper surface of the unit cell 11 via the extending piece 30 and the thermistor 29. Then, the pressing portion 59 is elastically deformed upward, and as a reaction thereof, exerts an elastic force downward. Thereby, the pressing part 59 presses the extension piece 30 and the thermistor 29 downward (in the direction toward the unit cell 11).

  Thus, the battery module 10 is formed. At this time, the length of the resin protectors 16A and 16B is adjusted while the distance between the adjacent connecting units 39A to 39D is changed by expansion and contraction of the hinge 43 formed on the FPC 17, and an attachment error with the unit cell group 12 is reduced. Absorbed.

(Operation and effect of this embodiment)
Then, the effect | action and effect of this embodiment are demonstrated. According to the present embodiment, it is the extension piece 30 and the thermistor 29 that are pressed against the unit cell 11 by the pressing portion 59, so that the main body portion of the FPC 17 does not receive a force from the pressing portion 59. Thereby, the FPC 17 can be protected.

  Further, according to the present embodiment, the thermistor 29 is in direct contact with the unit cell 11 and is pressed against the unit cell 11 by the pressing portion 59. Thereby, since the thermistor 29 and the cell 11 can be closely_contact | adhered, the temperature of the cell 11 can be detected reliably.

  In the present embodiment, the pressing portion 59 is formed so as to slightly protrude from the resin protector 16 toward the unit cell 11, and the thermistor 29 is disposed between the pressing unit 59 and the unit cell 11. Yes. Thereby, in a state where the resin protector 16 is attached to the unit cell group 12, the thermistor 29 is reliably brought into contact with the unit cell 11 by being sandwiched between the unit cell 11 and the pressing portion 59. Thereby, the temperature of the cell 11 can be detected reliably.

  Further, according to the present embodiment, the extension piece 30 is formed in a long and narrow band shape along the side edge of the second FPC band 20 and then bent at a right angle. Thereby, the extension piece 30 to which the thermistor 29 is attached can be formed by bending the extension piece 30 formed in the shape of an elongated band along the side edge of the second FPC band 20 at a right angle. As a result, the area required to create one second FPC band 20 can be reduced as compared with the case where the extending piece 30 is formed extending from the side edge of the second FPC band 20 at a right angle. Therefore, the yield can be improved.

  Further, according to the present embodiment, the resin protector 16 is formed with the FPC accommodating portions 41A to 41D that accommodate the FPC 17, and the resin protector 16 has the extended piece 30 led out from the FPC accommodating portions 41A to 41D. A guide portion 61 that guides the pressure to the pressing portion 59 is formed. As a result, the extended piece 30 is led out from the FPC housing portions 41 </ b> A to 41 </ b> D and guided to the pressing portion 59 by the guide portion 61. As a result, the thermistor 29 is reliably pressed against the unit cell 11 by the pressing part 59, so that the temperature of the unit cell 11 can be reliably detected.

  Further, according to the present embodiment, the FPC 17 has the mounting surface 21 on which the electronic component 23 and the thermistor 29 are mounted, and the electronic component 23 is attached to the FPC 17 in a state where the resin protector 16 is attached to the unit cell group 12. The thermistor 29 is arranged on the unit cell 11 side with respect to the extension piece 30 by bending the extension piece 30. Thus, according to the present embodiment, the electronic component 23 and the thermistor 29 can be mounted on the mounting surface 21 of the FPC 17 in the same process. Furthermore, since the thermistor 29 and the unit cell 11 can be brought into direct contact with each other, the temperature of the unit cell 11 can be detected more reliably.

  Further, according to the present embodiment, the FPC 17 is formed with the land 27 that is electrically connected to the electrode terminal 14 and detects the voltage of the unit cell 11. Thereby, since the voltage of the cell 11 can be detected by the land 27 formed in the FPC 17, it is not necessary to separately wire the voltage detection electric wire. Thereby, the wiring module 13 for batteries can be reduced in size.

  Further, according to the present embodiment, the resin protector 16 accommodates the bus bars 15A and 15B that connect the electrode terminals 14 of different unit cells 11 to each other. Thereby, by attaching the resin protector 16 to the unit cell group 12, the electrode terminals 14 of different unit cells 11 can be electrically connected.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the present embodiment, the configuration is such that three extended pieces 30 are formed in one second FPC band 20, but the present invention is not limited to this, and as shown in FIG. Alternatively, the four extended pieces 30 may be formed. Further, one FPC 17 may be configured such that one, two, or five or more extending pieces 30 are formed.

  (2) In the present embodiment, the pressing portion 59 is formed integrally with the resin protector 16. However, the present invention is not limited thereto, and the pressing portion 59 is formed separately from the resin protector 16. It is good also as a structure which presses the thermistor 29 to the cell 11 by attaching to the protector 16. FIG.

  (3) In the present embodiment, the extended piece 30 is formed by cutting out the side edge of the FPC 17, but is not limited thereto, and the extended piece 30 is formed by extending outward from the side edge of the FPC 17. It is good also as a structure to be made.

  (4) In the present embodiment, the voltage detection conductive path 22 formed in the FPC 17 and the bus bar 15 are electrically connected to detect the voltage of the electrode terminal 14, but the voltage detection conductive path 22 is formed in the FPC 17. The conductive path 18 and the bus bar 15 may not be connected.

  (5) In the present embodiment, the electrode terminals 14 of different unit cells 11 are electrically connected by the bus bars 15A and 15B. However, the present invention is not limited to this. For example, the electrode terminals 14 are connected by electric wires. Alternatively, they may be connected by a braided wire having flexibility. Further, the electrode terminals 14 formed in a plate shape are bent in a direction approaching each other, and the electrode terminals 14 are electrically pressed by an elastic member in a state where the electrode terminals 14 are overlapped with each other. You may connect.

  (6) In the present embodiment, the thermistor 29 is used as the temperature detection unit. However, the temperature detection unit is not limited to this, and the temperature detection unit can detect the temperature of the unit cell 11 such as a thermocouple or a semiconductor element having a PN bond. An appropriate member can be selected as appropriate.

  (7) In the present embodiment, the unit cell 11 has a flat rectangular parallelepiped shape, but is not limited thereto, and may have any shape such as a cylindrical shape or a rectangular tube shape as necessary. In the present embodiment, the pair of electrode terminals 14 and 14 are formed from the upper surface of the unit cell 11. However, the present invention is not limited thereto, and one electrode terminal 14 is formed on the upper surface of the unit cell 11. One electrode terminal 14 may be formed on the lower surface. Moreover, it is good also as a structure by which the electrode terminal 14 is formed in the flat surface of the cell 11, respectively.

DESCRIPTION OF SYMBOLS 11 ... Single cell 12 ... Single cell group 13 ... Wiring module for batteries 14 ... Electrode terminal 15A, 15B ... Bus bar (connection member)
16 ... Resin protector 17 ... FPC (Flexible Printed Circuit Board)
21 ... Mounting surface 23 ... Electronic component 27 ... Land 29 ... Thermistor (temperature detector)
30 ... Extension piece 41A, 41B, 41C, 41D ... FPC accommodating part (accommodating part)
59 ... Pressing part 61 ... Guide part

Claims (7)

A battery wiring module attached to a unit cell group including a plurality of unit cells having positive and negative electrode terminals,
A resin protector made of synthetic resin, a flexible printed circuit board disposed on the resin protector, an extended piece extending from a side edge of the flexible printed circuit board and routed toward the unit cell, and the extension A temperature detection unit that is attached to the output piece and detects the temperature of the unit cell in contact with the unit cell;
The said resin protector is a battery wiring module provided with the press part which presses the said extension piece and the said temperature detection part to the said cell, and makes the said temperature detection part contact the said cell.   The said press part protrudes slightly toward the said cell side from the said resin protector, The said temperature detection part is distribute | arranged between the said press part and the said cell. Battery wiring module.   3. The battery wiring module according to claim 1, wherein the extension piece is formed in a strip shape along a side edge of the flexible printed circuit board and then bent at a right angle. The resin protector is formed with an accommodating portion for accommodating the flexible printed circuit board,
The battery wiring module according to any one of claims 1 to 3, wherein the resin protector is formed with a guide portion that guides the extending piece led out from the housing portion to the pressing portion. . The flexible printed circuit board has a mounting surface on which electronic components and the temperature detection unit are mounted,
In a state where the resin protector is attached to the unit cell group, the electronic component is disposed on the opposite side to the unit cell with respect to the flexible printed circuit board, and the temperature detection unit is the extension piece. The battery wiring module according to any one of claims 1 to 4, wherein the battery wiring module is disposed on the unit cell side with respect to the extending piece by being bent.   The battery wiring module according to any one of claims 1 to 5, wherein a land that is electrically connected to the electrode terminal and detects the voltage of the unit cell is formed on the flexible printed circuit board. .   The battery wiring module according to any one of claims 1 to 6, wherein a connection member that connects the electrode terminals of different unit cells is accommodated in the resin protector.

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