JP2013152917A - Wiring module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring module capable of certainly detecting a state of each unit cell.SOLUTION: A wiring module 13 is attached to a unit cell group 12 made by aligning a plurality of unit cells 11 equipped with monitor terminals 18 for monitoring internal states. The wiring module 13 includes: a plurality of conducting paths 20 equipped with detection terminals 19 for detecting the states of the unit cells 11 at end portions; an insulation holding member 21 for holding the plurality of conducting paths 20; and a connector fitting portion 40 provided on the holding member 21, and fitted with a fitted portion 17 storing the detection terminals 19 and provided on the unit cell group 12 to connect the detection terminals 19 with the monitor terminals 18. The connector fitting portion 40 is formed on an extending portion 52 extended from the holding member 21 in a cantilever state.

Description

  The present invention relates to a wiring module.

  For example, a battery module described in Patent Document 1 is known as a battery module mounted on a vehicle such as an electric vehicle or a hybrid vehicle. This has a unit cell group in which a plurality of unit cells having positive and negative electrode terminals at the upper end are arranged side by side, and a battery wiring module attached to the unit cell group.

  The battery wiring module is fastened together with the bus bar by connecting the cells in series by connecting the positive electrode terminal and the negative electrode terminal of the adjacent unit cells, and screwing the nut to the electrode terminal. It comprises a detection terminal and an insulating resin protector that houses the bus bar and the detection terminal. The detection terminal is connected to the ECU, for example, by a detection line, and the state of each unit cell (for example, the voltage of the unit cell) is detected by the ECU.

JP 2011-91003 A

  However, according to the above configuration, since the electrode detection terminal must be tightened and connected to the electrode terminal by the nut, there is a problem that the connection work between the voltage detection terminal and the electrode terminal is complicated.

  Therefore, a connector fitting portion that accommodates the detection terminal inside is formed in the wiring module, and this connector fitting portion is fitted to a fitting portion provided on the unit cell group side to thereby singly detect the detection terminal. A configuration in which the battery is connected to the electrode terminal is considered. According to this, a detection terminal and an electrode terminal can be made into a connection state by fitting a connector fitting part and a to-be-fitted part.

  However, according to said structure, when the to-be-fitted part provided in the cell group side shifted | deviated from a normal position, there was a concern that a connector fitting part cannot carry out a normal fitting with a to-be-fitted part. Then, there arises a problem that it is difficult to reliably detect the state of each cell by the detection terminal.

  The present invention has been completed based on the above circumstances, and an object thereof is to provide a wiring module capable of reliably detecting the state of each unit cell.

  The present invention is a wiring module attached to a unit cell group in which a plurality of unit cells having a monitor terminal for monitoring an internal state are arranged, and detecting the state of the unit cell at an end portion A plurality of conductive paths provided with terminals; an insulating holding member that holds the plurality of conductive paths; and a holding member that is provided in the holding member and accommodates the detection terminal therein and is provided in the unit cell group. A connector fitting part that connects the detection terminal to the monitor terminal by fitting with a fitting part, and the connector fitting part is extended in a cantilevered manner from the holding member Is formed.

  According to the present invention, the extending portion extended in a cantilever shape is bent and deformed in a direction intersecting the extending direction, so that the misalignment of the fitted portion can be absorbed. Thereby, even when a to-be-fitted part shifts, a connector fitting part and a to-be-fitted part can be normally fitted. As a result, the detection terminal and the monitor terminal can be reliably electrically connected.

  As embodiments of the present invention, the following embodiments are preferable.

  The extending portion is formed with a locking portion that engages with a locking receiving portion formed in the fitted portion to lock the extended portion and the fitted portion. preferable.

  According to the above aspect, even when the fitted portion is displaced, the displacement is absorbed by the deformation of the extending portion, so that the extending portion and the fitted portion are securely locked. can do.

  The holding member includes a case and a cover that is assembled to the case and covers the case, and a plurality of divided portions are integrally connected to the case via elastically deformable deforming portions. In each of the divided portions, the connector fitting portion is formed, and the cover is formed with a cover side extending portion that extends in a cantilever manner corresponding to the divided portion, The extension part is formed by the split part and the cover side extension part.

  According to said aspect, even when the space | interval of division parts changes, it can absorb by a deformation | transformation part elastically deforming. On the other hand, when the space | interval of the division part of a case changes, it absorbs because a cover side extension part bends and deforms. As a result, even when the fitted portion is displaced, the displacement is reliably absorbed, so that the connector fitting portion and the fitted portion can be securely fitted properly.

  The conductive path is preferably formed on a flexible printed circuit board. Thereby, the process of bundling electric wires becomes unnecessary compared with the case where a plurality of electric conduction paths are formed with a wire harness which bundled a plurality of electric wires, for example. Furthermore, the wiring module can be reduced in weight.

  The conductive path is preferably formed by a wire harness in which a plurality of electric wires are bundled. Thereby, manufacturing cost can be reduced compared with the case where a flexible printed circuit board is used, for example.

  According to the present invention, the state of each unit cell can be reliably detected in the wiring module.

FIG. 1 is a perspective view showing a battery module according to Embodiment 1 of the present invention. FIG. 2 is a front view showing the unit cell. FIG. 3 is an exploded perspective view showing the unit cell group and the wiring module. FIG. 4 is a plan view showing the FPC. FIG. 5 is a front view showing the FPC. FIG. 6 is an exploded perspective view showing the wiring module. FIG. 7 is a perspective view showing the case unit. FIG. 8 is a plan view showing the case unit. FIG. 9 is a front view showing the case unit. FIG. 10 is a perspective view showing the cover. FIG. 11 is a front view showing the cover. FIG. 12 is a partially enlarged perspective view showing the end cover. FIG. 13 is a side view showing the wiring module. FIG. 14 is a partially cutaway sectional view showing a fitting structure between the connector fitting portion and the fitted portion. FIG. 15 is a perspective view showing a battery module according to Embodiment 2 of the present invention. FIG. 16 is an exploded perspective view showing the single cell group and the wiring module. FIG. 17 is a perspective view showing a wire harness. FIG. 18 is an exploded perspective view showing the wiring module. FIG. 19 is a perspective view showing the case unit. FIG. 20 is a plan view showing the case unit.

<Embodiment 1>
A first embodiment in which the present invention is applied to a battery module 10 will be described with reference to FIGS. The battery module 10 according to the present embodiment is used as a power source for driving a vehicle such as an electric vehicle or a hybrid vehicle. The battery module 10 includes a unit cell group 12 in which a plurality of unit cells 11 are arranged, and a wiring module 13 attached to the unit cell group 12. In the following description, the Z direction in FIG. 1 is the upper side, and the direction opposite to the Z direction is the lower side. Moreover, let the X direction in FIG. 1 be the front, and let the direction opposite to the X direction be the back. Further, the Y direction in FIG. 1 is the right side, and the direction opposite to the Y direction is the left side.

(Single cell group 12)
As shown in FIG. 2, the unit cell 11 has a flat, substantially rectangular parallelepiped shape. A power generation element (not shown) is accommodated inside the unit cell 11. The upper, lower, left and right side surfaces of the unit cell 11 are covered with an insulating frame portion 14 made of synthetic resin. On the upper surface of the unit cell 11, a pair of electrode terminals 80 projecting upward are formed at positions near both ends in the left-right direction.

  The electrode terminal 80 is made of metal, and a screw thread is formed on the outer periphery thereof. One of the pair of electrode terminals 80 is a positive electrode, and the other is a negative electrode. The adjacent unit cells 11 are arranged so that the electrode terminals 80 having different polarities are in contact with each other. The electrode terminals 80 of adjacent unit cells 11 are electrically connected by a bus bar 81 formed by pressing a metal plate material. Specifically, the bus bar 81 is fixed to the electrode terminal 80 by a nut 82 screwed into a screw thread formed on the electrode terminal 80. Thereby, the several cell 11 is connected in series. As the metal constituting the bus bar 81, any metal such as copper, copper alloy, aluminum, aluminum alloy, stainless steel and the like can be appropriately selected as necessary. On the surface of the bus bar 81, a plating layer made of any metal such as tin, nickel, zinc, or the like can be formed as necessary.

  As shown in FIG. 3, a pair of restraining plates 16 are attached to the front and rear ends of the unit cell group 12. The outer surface of the restraint plate 16 is made of an insulating synthetic resin. The plurality of single cells 11 are fixed in a state where a predetermined pressure is applied in the front-rear direction by being sandwiched between the pair of restraining plates 16. A power terminal 29 protruding upward is formed on the upper surface of the restraining plate 16. A screw thread is formed on the outer surface of the power terminal 29. The cell group 12 according to the present embodiment may include a restraint plate 16.

  On the upper surface of the insulating frame portion 14, a fitted portion 17 that protrudes upward is formed at a position near the right end portion. The fitted portion 17 has a cylindrical shape opened upward. A monitor terminal 18 electrically connected to the power generation element is disposed inside the fitted portion 17. The monitor terminal 18 can monitor the voltage of the unit cell 11 from the outside.

(Wiring module 13)
As shown in FIG. 1, a wiring module 13 is attached to the upper surface of the unit cell group 12. The wiring module 13 includes a plurality of conductive paths 20 provided with detection terminals 19 that detect the state of the unit cell 11 at an end, and an insulating holding member 21 that holds the plurality of conductive paths 20. A flexible printed circuit board (hereinafter also simply referred to as “FPC”) 22 and a bus bar 23 are held inside the holding member 21.

(FPC22)
As shown in FIGS. 4 and 5, the FPC 22 is formed by forming a plurality of conductive paths 20 on one or both sides of an insulating base film made of, for example, a polyimide film or a liquid crystal film by a printed wiring technique. The surface of 20 is covered with a protective film (for example, a polyimide film). In the drawing, only some of the conductive paths 20 are shown, and the other conductive paths 20 are omitted. The FPC 22 is formed to be elongated in the front-rear direction. On the right end edge of the FPC 22, a plurality of extending pieces 24 extending rightward are arranged side by side in the front-rear direction.

  A detection terminal 19 that protrudes downward is attached to the distal end portion of the extension piece 24 in a state of being electrically connected to the conductive path 20. The detection terminal 19 is attached to the conductive path 20 by a known method such as soldering.

  A plurality of electronic components 25 are attached to the upper surface of the FPC 22 in a state of being electrically connected to the conductive path 20. The electronic component 25 is attached to the conductive path 20 by a known method such as soldering.

  The FPC 22 is formed with a thermistor mounting piece 27 with a base film cut out and bent downward, and a thermistor 26 attached to the tip. The thermistor 26 is attached to the lower surface of the thermistor attachment piece 27 while being electrically connected to the conductive path 20. The thermistor 26 is attached to the conductive path 20 by a known method such as soldering.

  A connector housing 28 made of synthetic resin is attached to the upper surface of the FPC 22 at a position near the front end. A connector terminal 28A is disposed inside the connector housing 28, and the connector terminal 28A is electrically connected to the conductive path 20 by a known method such as soldering. The connector housing 28 is adapted to be fitted with a mating connector (not shown). The mating connector is connected to an ECU (not shown) via a wire harness 61 (not shown).

(Bus bar 23)
As shown in FIG. 6, the bus bar 23 is formed to be elongated in the front-rear direction. The bus bar 23 is formed by pressing a metal plate made of copper or a copper alloy into a predetermined shape. Both front and rear ends of the bus bar 23 are bent downward in a crank shape. At both front and rear ends of the bus bar 23, power terminal insertion holes 30 through which the power terminals 29 of the restraining plate 16 are inserted are formed. The power terminal insertion hole 30 penetrates the bus bar 23 and is formed in an elongated shape in the front-rear direction. The bus bar 23 and the power terminal 29 are connected by a nut (not shown) being screwed into a screw thread of the power terminal 29.

(Holding member 21)
As shown in FIG. 6, the holding member 21 includes a synthetic resin case 31 and a synthetic resin cover 32 that is assembled to the case 31 from above and covers the case 31.

(Case 31)
As shown in FIGS. 7 to 9, the case 31 includes a front case unit 33 disposed at the front end portion and a plurality (three in this embodiment) of case units 34. The front case unit 33 and the case unit 34 are formed by arranging a plurality of divided portions 35 elongated in the left-right direction in the front-rear direction via the connecting portions 36. The connecting portion 36 has a hinge 42 structure that can be elastically deformed. The connecting portions 36 are elastically deformed in the front-rear direction, so that the intervals between the plurality of divided portions 35 are adjusted.

  A partition portion 37 that protrudes upward and extends in the front-rear direction is formed at a position slightly shifted to the right side from the left end portion of each divided portion 35. The FPC 22 is placed in the area on the right side of the partition portion 37, and the bus bar 23 is placed in the area on the left side. By this partition portion 37, the FPC 22 and the bus bar 23 are kept in an insulated state.

  A thermistor insertion hole 38 through which the thermistor mounting piece 27 is inserted penetrates in at least one of the plurality of divided portions 35 constituting the front case unit 33 and the case unit 34 in the vertical direction. A thermistor holding portion 39 for holding the thermistor mounting piece 27 is formed on the bottom surface of the dividing portion 35 so as to protrude downward. The thermistor 26 is pressed against the upper surface of the unit cell 11 from above with the thermistor mounting piece 27 held on the lower surface of the thermistor holding portion 39.

  A connector fitting portion 40 that protrudes downward and accommodates the detection terminal 19 is formed at the right end of each divided portion 35. The connector fitting part 40 can be fitted to the fitted part 17 of the unit cell 11 from above. When the connector fitting portion 40 and the fitted portion 17 are fitted, the detection terminal 19 and the monitor terminal 18 are electrically connected.

  A connector cover 41 that covers the connector housing 28 of the FPC 22 from above is integrally formed on the front end portion of the front case unit 33 via a hinge 42. The connector cover 41 is configured such that a connector cover locking portion 43 formed on the connector cover 41 and a connector cover locking receiving portion 44 formed on the front case unit 33 are elastically locked.

(Cover 32)
As shown in FIGS. 10 and 11, the cover 32 has an elongated shape in the front-rear direction. A locking claw 46 is formed on the upper wall of the cover 32 and protrudes downward and engages with a hole edge of a locking hole 45 formed in the case 31 to assemble the cover 32 and the case 31 together. Yes. Further, a locking claw through hole 47 through which the locking claw 46 can penetrate is formed in the FPC 22 at a position corresponding to the locking claw 46.

  The cover 32 includes a plurality of (four in this embodiment) cover units 32A arranged in the front-rear direction and connected by a space adjusting means 38B having a hinge shape. The space | interval of the front-back direction between 32 A of cover units is adjusted when the space | interval connection means 38B bends and deforms.

  End covers 48 that cover the power terminals 29 of the restraint plate 16 and the ends of the bus bars 23 are formed integrally with the cover 32 via hinges 49 at both front and rear ends of the cover 32. As shown in FIG. 12, a pair of bus bar locking claws 50 projecting downward is formed on the upper wall of the cover 32. When the bus bar locking claw 50 is locked to the end portion of the bus bar 23, the end cover 48 is held in a closed state.

  A plurality of cover side extending portions 51 extending rightward are formed on the right end edge of the cover 32. The cover-side extending part 51 is formed at a position corresponding to the upper and lower sides with respect to the dividing part 35 of the case 31. As shown in FIGS. 3 and 13, the split portion 35 of the case 31 and the cover-side extension portion 51 of the cover 32 extend in a cantilevered manner outward (rightward) from the right edge of the holding member 21. The extended portion 52 is formed.

  As shown in FIG. 14, a connector locking portion 54 that elastically locks with the connector locking receiving portion 53 formed in the fitted portion 17 is formed at the right end portion of each extending portion 52. . In addition, a locking portion 56 that elastically locks with a locking receiving portion 55 formed on the insulating frame portion 14 of the unit cell 11 is formed at the left end portion of each divided portion 35. When the connector locking portion 54 and the connector locking receiving portion 53 are locked, and the locking portion 56 and the locking receiving portion 55 are locked, the wiring module 13 is assembled integrally with the unit cell group 12. It is like that.

(Assembly process of this embodiment)
Then, an example of the assembly | attachment process of the battery module 10 which concerns on this embodiment is demonstrated. In addition, the assembly process of the battery module 10 is not limited to the following description.

  First, the front case unit 33 and the case unit 34 are arranged side by side in the front-rear direction, and the FPC 22 is placed on the right side of the partition portion 37. At this time, the detection terminal 19 is arranged in the connector fitting portion 40. Then, the thermistor mounting piece 27 is inserted into the thermistor insertion hole 38 and arranged below the case 31, and the thermistor 26 is held by the thermistor holding portion 39 of the case 31. Subsequently, the bus bar 23 is placed on the left side of the partition portion 37.

  Subsequently, the cover 32 is put on the case 31 from above. At this time, the locking claw 46 of the cover 32 is passed through the locking claw through hole 47 of the FPC 22 and is locked to the hole edge of the locking hole 45 of the case 31. As a result, the cover 32 and the case 31 are assembled together. Next, the connector housing 41 is covered with the connector cover 41 by closing the connector cover 41. Thereby, the wiring module 13 is completed.

  Next, the unit cells 11 are formed by arranging the plurality of unit cells 11 in the front-rear direction and sandwiching the unit cells 11 by a pair of restraining plates 16 from the front-rear direction with a predetermined pressure. Next, the adjacent electrode terminals 80 are electrically connected by the bus bar 81.

  The wiring module 13 described above is assembled to the unit cell group 12 from above. In detail, the connector fitting part 40 of the wiring module 13 and the to-be-fitted part 17 of the cell group 12 are assembled so that it may fit. In this fitting process, the connector locking portion 54 of the wiring module 13 and the connector locking receiving portion 53 formed in the fitted portion 17 are elastically locked, and the locking portion 56 of the wiring module 13. And the latching receiving part 55 formed in the insulating frame part 14 is elastically locked, whereby the wiring module 13 and the unit cell group 12 are assembled together. When the connector fitting portion 40 is fitted into the fitted portion 17, the detection terminal 19 of the wiring module 13 and the monitor terminal 18 of the unit cell group 12 are electrically connected. At this time, the power terminal 29 of the restraining plate 16 is inserted into the power terminal insertion hole 30 of the bus bar 23.

  Next, the bus bar 23 and the power terminal 29 are electrically connected by screwing a nut into the thread of the power terminal 29. Thereafter, the end cover 48 is closed to cover the power terminal 29 and the end of the bus bar 23 with the end cover 48. Thereby, the battery module 10 is completed.

(Operation and effect of this embodiment)
Then, the effect | action and effect of this embodiment are demonstrated. According to this embodiment, since the extending part 52 is extended from the holding member 21 in a cantilevered manner, it can be bent and deformed vertically and horizontally. As described above, the extension portion 52 is bent in the vertical and horizontal directions, so that the misalignment of the fitted portion 17 can be absorbed. Thereby, even when the to-be-fitted part 17 shifts | deviates, the connector fitting part 40 and the to-be-fitted part 17 can be normally fitted. As a result, the detection terminal 19 and the monitor terminal 18 can be reliably electrically connected.

  Further, according to the present embodiment, each extending portion 52 is engaged with the connector locking receiving portion 53 formed in the fitted portion 17 so that the extended portion 52 and the fitted portion 17 are engaged. A connector locking portion 54 for stopping is formed. Accordingly, even when the plurality of fitted portions 17 are displaced independently of each other, the displacements are absorbed by each of the extended portions 52 being flexed and deformed independently. And since the latching | locking part 56 is formed in each extension part 52, the extension part 52 and the to-be-fitted part 17 can be latched reliably.

  Further, according to the present embodiment, the holding member 21 includes the case 31 and the cover 32 that is assembled to the case 31 and covers the case 31, and the plurality of divided portions 35 are elastically deformable in the case 31. Are connected to each other through a deformable portion, and each divided portion 35 is formed with a connector fitting portion 40, and the cover 32 is extended in a cantilever manner corresponding to the divided portion 35. The cover-side extending portion 51 is formed, and the dividing portion 35 and the cover-side extending portion 51 form an extending portion 52.

  According to said structure, even when the space | interval of the division parts 35 changes, a deformation | transformation part can absorb the change of the space | intervals of the division parts 35 by elastically deforming a deformation | transformation part. On the other hand, when the interval between the cover-side extension portions 51 of the case 31 changes, the change in the interval is absorbed by the cover-side extension portion 51 being bent and deformed. Thereby, even when the fitted portion 17 is displaced, the displacement is reliably absorbed by the divided portion 35 and the cover-side extending portion 51, so that the connector fitting portion 40 and the fitted portion 17 are securely connected. Can be properly fitted.

  More specifically, in the unit cell group 12 in which the plurality of unit cells 11 are arranged in the front-rear direction, the mated portion 17 provided in the unit cell group 12 is the same as the mated portion 17 of each unit cell 11. The manufacturing tolerance and the assembly tolerance in the arrangement direction of the cells 11 are added together. Then, there is a concern that the position shift of the fitted portion 17 may be considerably large between both ends of the unit cell group 12. Even in such a case, in the case 31, the interval between the divided portions 35 is adjusted by the interval adjusting portion, and in the cover 32, the feeling of the cover side extending portions 51 is the same as the cover side extending portion. 51 is adjusted by bending and deforming. Furthermore, even when the fitted portion 17 is displaced in the vertical direction, the split portion 35 and the cover-side extending portion 51 can be adjusted by being bent and deformed in the vertical direction.

  Further, according to the present embodiment, the conductive path 20 is formed on the flexible printed board. Thereby, the process of bundling the electric wire 60 becomes unnecessary compared with the case where the several conductive path 20 is formed with the wire harness 61 which bundled the several electric wire 60, for example. Furthermore, the weight of the wiring module 13 can be reduced.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIGS. 15 to 20. As shown in FIG. 15, in this embodiment, the wire harness 61 is formed by bundling a plurality of electric wires 60 corresponding to the conductive path. A terminal 62 is connected to one end of the electric wire 60. The electric wire 60 and the terminal 62 are connected by a known method such as crimping or soldering. A plurality (three in this embodiment) of connector housings 63 are connected to the other end of the electric wire 60. A plurality of electric wires 60 are connected to the rear surface of the connector housing 63.

  As shown in FIGS. 16 and 17, the wire harness 61 and the connector are led forward from the front end portion of the holding member 21. A mating connector (not shown) is connected to the connector, and is connected to an ECU (not shown) via the mating connector.

  Further, as shown in FIG. 15, the wire harness 61 includes a thermistor wire 65 having a thermistor 64 connected to one end thereof. The thermistor wire 65 is bundled together with the wire 60 described above. The other end of the thermistor wire 65 is connected to the connector housing 63 in the same manner as the wire 60 described above.

  As shown in FIG. 18, the case 66 includes a plurality (four in this embodiment) of case units 67. As shown in FIGS. 19 and 20, each case unit 67 is formed with a thermistor attachment portion 68 to which the thermistor 64 is attached, opening upward. The thermistor 64 is fitted to the thermistor mounting portion 68 from above. The thermistor 64 attached to the thermistor attaching portion 68 is pressed against the upper surface of the unit cell 11 from above.

  The wire harness 61 is placed at a position on the right side of the partition portion 69 of the case 66, and the bus bar 23 is placed at a position on the left side of the partition portion 69 of the case 66. Thereby, the wire harness 61 and the bus bar 23 are held in an insulated state.

  Since the configuration other than the above is substantially the same as that of the first embodiment, the same members are denoted by the same reference numerals, and redundant description is omitted.

  According to this embodiment, since the conductive path is formed by the wire harness 61 in which a plurality of electric wires 60 are bundled, for example, the manufacturing cost can be reduced as compared with the case where the FPC 22 is used.

<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 detection terminal 19 is configured to detect the voltage of the unit cell 11, but is not limited thereto, and the detection terminal 19 may detect a current flowing through the unit cell 11.

  (2) In the present embodiment, the unit cell 11 has a configuration in which a pair of electrode posts protrudes from the upper surface. However, the present invention is not limited to this. Good. The unit cell group 12 may not include the restraint plate 16.

DESCRIPTION OF SYMBOLS 11 ... Single cell 12 ... Single cell group 13 ... Wiring module 17 ... Mated part 18 ... Monitor terminal 19 ... Detection terminal 20 ... Conductive path 21 ... Holding Member 22 ... FPC (Flexible Printed Circuit Board)
31 ... Case 32 ... Cover 35 ... Split part 40 ... Connector fitting part 51 ... Extension part on the cover side 52 ... Extension part 55 ... Lock receiving part 56. .. Locking part 60 ... Electric wire (conductive path)
61 ... Wire harness

Claims (5)

A wiring module attached to a unit cell group in which a plurality of unit cells having monitor terminals for monitoring an internal state are arranged,
A plurality of conductive paths provided with a detection terminal for detecting the state of the unit cell at an end; and
An insulating holding member holding the plurality of conductive paths;
A connector fitting portion that is provided on the holding member, accommodates the detection terminal therein, and is fitted with a fitted portion provided in the unit cell group to connect the detection terminal to the monitor terminal; With
The connector fitting portion is a wiring module formed in an extending portion that is cantilevered from the holding member.   The extension portion is formed with a locking portion that engages with a locking receiving portion formed in the fitted portion to lock the extended portion and the fitted portion. The wiring module according to 1. The holding member includes a case and a cover that is assembled to the case and covers the case,
In the case, a plurality of divided portions are integrally connected via elastically deformable deformable portions, and the connector fitting portions are formed in each of the divided portions,
The cover is formed with a cover-side extension portion that extends in a cantilever manner corresponding to the divided portion,
The wiring module according to claim 1, wherein the extension part is formed by the split part and the cover side extension part.   The wiring module according to any one of claims 1 to 3, wherein the conductive path is formed on a flexible printed circuit board.   The wiring module according to any one of claims 1 to 3, wherein the conductive path is formed by a wire harness in which a plurality of electric wires are bundled.

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