JP2013080618A - Wiring module for battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring module for battery using a lamination type unit cell groups in which the voltage of each unit cell can be detected reliably.SOLUTION: The wiring module 40 for battery is attached to a unit cell group 20 in which unit cells 21 are connected in series by arranging a plurality of unit cells 21, each having an extended terminal 23A and a flat terminal 23B with the electrode terminal surfaces 23C of a positive electrode and a negative electrode being provided on the front and back, while laminating and bringing the electrode terminal surface 23C of the extended terminals 23A and the flat terminal 23B of adjoining unit cells 21 into contact. The wiring module 40 for battery includes an FPC 41 formed to extend in the lamination direction of the unit cells 21 and provided, at one end thereof, with a plurality of conductive paths 42 having a lead-in wire 45 being introduced to a terminal housing part 26 between the unit cells 21, a resin protector 60 holding the FPC 41, and a metal terminal 46 provided at the lead-in wire 45 and connected with the flat terminal 23B of the unit cell 21.

Description

  The present invention relates to a battery 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 each having a positive electrode electrode and a negative electrode terminal 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. A voltage detection terminal and an insulating resin protector that accommodates the bus bar and the voltage detection terminal therein are provided. The voltage detection terminal is connected to, for example, an ECU via a voltage detection line, and the voltage of each unit cell is detected by the ECU.

JP 2011-91003 A

By the way, in recent years, for the purpose of reducing the size and weight of the battery module, by arranging a plurality of unit cells having positive and negative electrode terminal surfaces on the front and back, the electrode terminal surfaces of adjacent unit cells can be arranged. It has been studied to use, for a battery module, a stacked unit cell group in which unit cells are connected in series. According to such a configuration, the structure of the battery module can be reduced in size and weight as compared with the conventional battery module, for example, it is not necessary to provide an electrode terminal on the upper end of the unit cell.
However, according to such a configuration, since the electrode terminal surface of each unit cell is not exposed to the outside, the configuration for detecting the voltage of each unit cell becomes difficult.

  The present invention has been completed based on the above circumstances, and is a battery module that can reliably detect the voltage of each unit cell while using a stacked unit cell group. The purpose is to provide modules.

  As a means for achieving the above object, the present invention provides a stack of a plurality of unit cells having positive and negative electrode terminal surfaces on the front and back sides, so that the electrode terminal surfaces of the adjacent unit cells are arranged together. A wiring module for a battery that is attached to a unit cell group in which the unit cells are connected in series with each other, the assembly conductive line formed by aggregating a plurality of conductive paths formed extending in the stacking direction of the unit cells; An introduction line portion provided at one end of the conductive path and introduced into a gap between the unit cells for each predetermined number of the unit cells, an insulating support member for holding the collective conductive line, and the introduction line And a voltage detection terminal part that is connected to the electrode terminal surface of the unit cell.

According to the battery wiring module having such a configuration, the voltage detection terminal portion and the electrode terminal surface can be obtained by introducing the introduction line portion into the gap between adjacent single cells and bringing the voltage detection terminal portion into contact with the electrode terminal surface. Can be securely connected. As a result, the voltage detection of each single cell can be performed reliably.
Moreover, since the lead wire portion can be introduced into the gap between the single cells to connect the voltage detection terminal portion and the electrode terminal surface, the voltage detection terminal is connected to the electrode terminal by tightening the nut to the electrode terminal. Compared with the battery wiring module, the connection operation between the voltage detection terminal portion and the electrode terminal surface can be easily performed.
Furthermore, since the number of parts of the battery wiring module can be reduced compared to a conventional battery wiring module having a bus bar for connecting the electrode terminals, the manufacturing cost of the battery wiring module can be reduced, and the battery The wiring module can be reduced in weight.

The following configuration is preferable as an embodiment of the present invention.
The collective conductive line may be formed of a flexible printed board, and the lead-in portion may be integrally extended from the conductive path of the flexible printed board.
According to such a configuration, a work process for bundling electric wires is not required and the battery wiring module can be reduced in weight as compared with a collective conductive line formed by a wire harness in which electric wires are bundled.

The voltage detection terminal unit may be configured to be sandwiched in the stacking direction of the unit cells by the electrode terminal surfaces of the adjacent unit cells.
According to such a configuration, the voltage detection terminal portion and the electrode terminal surface can be brought into contact with each other by sandwiching the voltage detection terminal portion between the electrode terminal surfaces of the adjacent unit cells. Compared with the case where a biasing member for biasing the detection terminal portion is provided, the voltage detection terminal portion and the electrode terminal surface can be connected without increasing the number of components.

The voltage detection terminal portion may be formed by a metal terminal inserted into a recess formed in an edge portion of the electrode terminal surface of the unit cell.
When the voltage detection terminal part formed by the metal terminal is sandwiched between the electrode terminal surfaces of adjacent unit cells, a gap is generated between the electrode terminal surfaces not sandwiching the voltage detection terminal part, and the connection state between the electrode terminals is May become unstable. In that respect, according to the above configuration, since the voltage detection terminal portion is formed by the metal terminal inserted into the recess formed in the electrode terminal, it is possible to suppress the formation of a gap between the electrode terminal surfaces. . Thereby, the connection state between electrode terminal surfaces can be made favorable.

The metal terminal may be configured to be elastically deformable in the stacking direction of the unit cells.
According to such a configuration, even when the pitch between the electrode terminal surfaces becomes narrow due to the expansion of the unit cell in the stacking direction due to heat or the like, the metal terminal elastically deforms in the stacking direction of the unit cell to reduce the pitch. Misalignment can be absorbed. Thereby, the connection of a metal terminal and an electrode terminal surface can be maintained favorable.

The introduction line portion may be arranged in a staggered manner in a direction in which the collective conductive line extends on both sides in the long side direction of the collective conductive line.
According to such a configuration, for example, when the lead-in line portion is formed long, compared with the case where the lead-in wire part is formed linearly in the extending direction of the collective conductive line, the material removal can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, although it is a battery module using a laminated type cell group, the voltage detection of each cell can be performed reliably.

1 is a perspective view of a battery module according to Embodiment 1. FIG. 1 is a partially enlarged plan view of a battery module according to Embodiment 1. FIG. 1 is a front view of a battery module according to Embodiment 1. FIG. The principal part enlarged front view which shows the state by which the battery wiring module was mounted | worn with the cell group which concerns on Embodiment 1. FIG. The principal part expanded sectional view which shows the state by which the battery wiring module was mounted | worn with the cell group which concerns on Embodiment 1, and the state in which the metal terminal and the flat terminal were connected. The principal part expanded sectional view which shows the state before a battery wiring module is mounted | worn in the cell group which concerns on Embodiment 1, and before a voltage detection terminal and the rear surface of a flat terminal are connected. 1 is a perspective view of a battery wiring module according to Embodiment 1. FIG. 1 is a partially enlarged plan view of a battery wiring module according to Embodiment 1. FIG. 1 is a front view of a battery wiring module according to Embodiment 1. FIG. The partially expanded side view of the battery wiring module which concerns on Embodiment 1. FIG. The partially expanded bottom view of the battery wiring module which concerns on Embodiment 1. FIG. XII-XII sectional view of FIG. The partially expanded perspective view which shows the state before mounting | wearing the resin protector which concerns on Embodiment 1 with FPC. The partially expanded perspective view which shows the state which mounted FPC in the mounting part of the resin protector which concerns on Embodiment 1. FIG. FIG. 4 is a partially enlarged perspective view of the unit cell group according to Embodiment 1. 1 is a partially enlarged plan view of a unit cell group according to Embodiment 1. FIG. 1 is a partially enlarged perspective view of a flexible printed circuit board according to Embodiment 1. FIG. The perspective view of the battery module which concerns on Embodiment 2. FIG. Partially enlarged plan view of a battery module according to Embodiment 2 Front view of battery module according to Embodiment 2 The principal part expanded sectional view which shows the state by which the battery wiring module was mounted | worn in the cell group which concerns on Embodiment 2, and the voltage detection terminal, the overhang | projection terminal, and the flat terminal were connected Partially enlarged plan view of a battery wiring module according to Embodiment 2 Front view of battery wiring module according to Embodiment 2 The partially expanded side view of the wiring module for batteries which concerns on Embodiment 2. FIG. The perspective view of the metal terminal which concerns on Embodiment 2. FIG. The partially expanded perspective view of the cell group which concerns on Embodiment 2. FIG. Partially enlarged plan view of the cell group according to Embodiment 2

<Embodiment 1>
Embodiment 1 of the present invention 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. As shown in FIG. 1, the battery module 10 includes a unit cell group 20 in which a plurality of (38 in the present embodiment) unit cells 21 are arranged side by side, and a battery wiring module 40 attached to the unit cell group 20. It is configured with. In the following description, the vertical direction is based on the vertical direction in FIG. 3, the horizontal direction is based on the horizontal direction in FIG. 3, and the front-back direction is based on the horizontal direction in FIG.

  As shown in FIGS. 1 and 2, the unit cell 21 has a flat and substantially rectangular parallelepiped shape, and a power generation element (not shown) is accommodated therein. The upper, lower, left and right side surfaces of the unit cell 21 are covered with an insulating resin portion 22 made of synthetic resin, and the front and rear side surfaces (both front and back sides) of the unit cell 21 are connected to an internal power generation element in a conductive manner. A pair of electrode terminals 23 is provided.

  The pair of electrode terminals 23 are made of metal and have a substantially rectangular shape in front view that is slightly smaller than the outer peripheral shape of the unit cell 21 as shown in FIG. 3, and each electrode terminal 23 has a shape as shown in FIG. The electrode terminal surface 23 </ b> C is in contact with the electrode terminals 23 of the adjacent unit cells 21 in the front-rear direction. One of the pair of electrode terminals 23 is a positive electrode terminal 23, and the other is a negative electrode terminal 23. Further, as shown in FIGS. 5 and 6, the electrode terminal 23 located on the front side of the electrode terminals 23 is an overhanging terminal 23 </ b> A that projects slightly forward from the front end surface of the insulating resin portion 22. The electrode terminal 23 located in the position is a flat terminal 23 </ b> B formed flush with the rear end surface of the insulating resin portion 22. A plurality of single cells 21 are stacked in the front-rear direction so that the overhanging terminal 23A and the flat terminal 23B are adjacent to each other, and the front surface (electrode terminal surface 23C) of the overhanging terminal 23A and the rear surface of the flat terminal 23B. A unit cell group 20 in which a plurality of unit cells 21 are electrically connected in series is configured by contacting (electrode terminal surface 23C).

  Further, as shown in FIG. 2, for example, an electrode plate 24 whose front or rear surface is covered with an insulating resin portion 22 is attached to both ends in the front-rear direction of the unit cell group 20. 23B is not exposed in the front-rear direction. The unit cell group 20 is fixed by fixing means such as a holding plate (not shown) so that the extension terminal 23A and the flat terminal 23B of the adjacent unit cell 21 are not in a non-contact state.

  On the upper surface of the unit cell 21, a pair of engagement pieces 25 that rise upward are formed. The pair of engagement pieces 25 are formed so as to be elastically deformable in the left-right direction, and are configured to protrude inward so that the front ends of the engagement pieces 25 face each other.

As shown in FIGS. 1 and 3, a battery wiring module 40 extending in the front-rear direction is attached to the upper surface of the unit cell group 20.
The battery wiring module 40 includes a flexible printed circuit board 41 (an example of an “aggregate conductive line” of the present invention) and a resin protector 60 (an “insulating support member” of the present invention) that surrounds the flexible printed circuit board 41 over the entire circumference. For example).

As shown in FIG. 17, a flexible printed circuit board (hereinafter also simply referred to as “FPC”) 41 has a plurality of conductive films formed 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. A path 42 is formed, and the surface of the conductive path 42 is covered with a protective film (for example, a polyimide film). Note that the conductive path 42 is not shown in FIGS. 13 and 14.
The FPC 41 includes an FPC main body 43 that extends in the front-rear direction, which is the stacking direction of the unit cells 21, and a plurality of introduction pieces 44 that are integrally formed with the FPC main body 43.

  The length dimension in the front-rear direction of the FPC main body 43 is set to be longer than the length dimension in the front-rear direction of the unit cell group 20, and the FPC main body 43 has a plurality of conductive paths 42 extending in the front-rear direction. It is formed in an aggregated form. Further, an introduction line portion 45 of an introduction piece 44 described later is formed at a terminal on the rear side of the conductive path 42 in the FPC main body 43, and an ECU (not shown) or the like is provided at a terminal on the front side of the conductive path 42, for example. Connected.

  Each introduction piece 44 is formed in a strip shape projecting in a direction away from the FPC main body 43 at the ends on both sides in the left-right direction of the FPC main body 43 and extending downward from the front end edge thereof. In addition, each introduction piece 44 forms a cut from the both ends of the FPC 41 in the left-right direction toward the FPC main body 43, and further forms a cut from the back end of the cut to the rear. It is formed by bending down the part surrounded by.

  The introduction pieces 44 are formed between the unit cells 21 on both sides in the left-right direction of the FPC main body 43, and each introduction piece 44 has a thickness dimension of the unit cells 21 on both sides in the left-right direction around the FPC main body 43. It is arranged in a staggered pattern that is shifted in the front-rear direction by the amount. Thereby, compared with the case where the introduction piece 44 in which the introduction line part is formed in the front-rear direction is formed linearly, the material removal of the introduction piece 44 can be improved.

  An introduction line portion 45 is formed in each introduction piece 44. The lead-in wire portion 45 is integrally formed by extending from the rear end of the conductive path 42 of the FPC main body portion 43. The introduction line portion 45 extends in the left-right direction from the rear end portion of the conductive path 42 in the FPC main body portion 43 toward the portion protruding in the left-right direction of the introduction piece 44, and extends downward from the side end portion of the introduction piece 44. It is formed to extend downward so as to be arranged at a substantially central portion in the left-right direction of the extended portion. In addition, an electrode pad (not shown) is provided at the lower end portion of the introduction line portion 45 on the front surface of the introduction piece 44. As shown in FIG. Are connected by a known method such as reflow soldering.

  The metal terminal 46 is a detection terminal that takes in information related to the voltage of the unit cell 21 by being connected to the electrode terminal 23 of the unit cell 21 in a conductive manner. As shown in FIGS. The front surface of the metal terminal 46 is formed to be elastically deformable in the front-rear direction. In addition, the information regarding the voltage obtained at the metal terminal 46 is taken into ECU etc. which are not shown in figure through the introductory line part 45 and the electrically conductive path 42, and the voltage of each cell 21 is detected.

  The inside of the metal terminal 46 is a bending space 46A when the front surface of the metal terminal 46 is elastically deformed rearward. On the other hand, when the battery wiring module 40 is mounted on the upper surface of the unit cell group 20 on the overhanging terminal 23A of the unit cell 21, as shown in FIGS. A terminal accommodating portion 26 (an example of the “concave portion” of the present invention) that accommodates the terminal 46 is formed.

  The terminal accommodating portion 26 is formed in the upper edge portion of the overhanging terminal 23A in a form slightly recessed rearward from the front surface of the overhanging terminal 23A, and opens upward and forward. The depth dimension in the front-rear direction of the terminal accommodating portion 26 is set to be substantially the same as the dimension obtained by combining the protruding dimension of the metal terminal 46 and the thickness dimension of the introduction piece 44. Here, “substantially the same” means that the depth dimension in the front-rear direction of the terminal accommodating portion 26 is the same as the combined dimension of the protruding dimension of the metal terminal 46 and the thickness dimension of the introduction piece 44, and This includes the case where the depth dimension in the front-rear direction is slightly smaller than the combined dimension of the overhang dimension of the metal terminal 46 and the thickness dimension of the introduction piece 44.

  That is, when the battery wiring module 40 is mounted on the unit cell group 20 and the metal terminal 46 is accommodated in the terminal accommodating portion 26, the metal terminal 46 provided on the introduction piece 44 is adjacent to the adjacent terminal as shown in FIG. The rear surface (electrode terminal surface 23C) of the flat terminal 23B of the unit cell 21 and the rear inner surface of the terminal accommodating portion 26 are sandwiched between the rear surface (electrode terminal surface 23C) of the flat terminal 23B of the unit cell 21 and the metal terminal 46. Is in contact with the front surface in the front-rear direction, so that the rear surface of the flat terminal 23B (the electrode terminal surface 23C) and the metal terminal 46 are connected to be conductive. As a result, the voltage detection of each cell 21 can be performed reliably. When the depth dimension in the front-rear direction of the terminal accommodating portion 26 is slightly smaller than the combined dimension of the protruding dimension of the metal terminal 46 and the thickness dimension of the introduction piece 44, the front surface of the metal terminal 46 is bent. The flat terminal 23 </ b> B and the metal terminal 46 are connected so as to be conductive by being slightly elastically deformed toward the space 46 </ b> A. Thereby, the extension terminal 23A and the flat terminal 23B of the adjacent unit cell 21 can be reliably connected without causing a gap between the extension terminal 23A and the flat terminal 23B of the adjacent unit cell 21. .

  The resin protector 60 is configured by arranging a plurality (four in this embodiment) of connecting units 61 made of an insulating resin in the front-rear direction. Adjacent connecting units 61 are connected by the FPC 41 while holding the FPC 41 by attaching the FPC 41.

  As shown in FIGS. 7 and 10, the connecting unit 61 includes a placement portion 62 on which the FPC 41 is placed, and a cover 63 formed integrally with the placement portion 62. Further, the width dimension of the connecting unit 61 is set to be substantially the same as the length dimension between the pair of engaging pieces 25 in the unit cell 21 as shown in FIG.

  The mounting unit 62 includes a divided mounting unit 64 that is divided into a plurality of (10 in the present embodiment) in the front-rear direction, and the adjacent divided mounting units 64 adjust the gap interval between the divided mounting units 64. Are connected by a gap interval adjusting means 65.

  The gap interval adjusting means 65 is composed of a pair of elastic portions 66 that are elastically deformable in the front-rear direction to connect the opposite side edges of the adjacent divided placement portions 64 in the front-rear direction. It is arranged in a direction and is formed in a substantially U shape in side view that bulges downward from the lower surface of the divided mounting portion 64. Therefore, when the elastic portion 66 is elastically deformed in the front-rear direction, the divided placement portions 64 are displaced in the front-rear direction, so that the gap in the front-rear direction between the divided placement portions 64 can be increased or decreased. It has become.

  The FPC main body 43 is placed at a substantially central portion in the left-right direction of the divided placement portion 64, and the introduction pieces 44 of the FPC 41 are placed at both left and right ends of the divided placement portion 64. It has come to be. In addition, an introduction piece insertion hole 67 that penetrates the division placement portion 64 in the vertical direction is formed in a portion of the division placement portion 64 where the introduction piece 44 is placed. The introduction piece insertion hole 67 is formed so that the introduction piece 44 can be inserted, and a pair of support portions 68 projecting downward from the lower surface of the divided mounting portion 64 at both ends in the left-right direction of the introduction piece insertion hole 67. Is formed.

  As shown in FIGS. 9 to 11, the two support portions 68 are each formed in a concave shape in cross section, and the both support portions 68 face the concave openings along the peripheral edge portion of the introduction piece insertion hole 67. They are arranged together. The left and right ends of the portion of the introduction piece 44 that extends downward are disposed on the concave inner sides of the support portions 68, and the introduction piece 44 is supported by the support portions 68 in the front-rear and left-right directions.

  Further, the thickness dimension of the support portion 68 in the front-rear direction is set to be slightly smaller than the extension dimension of the extension terminal 23A of the unit cell 21, and each support unit 68 is connected to the battery wiring on the upper surface of the unit cell group 20. When the module 40 is mounted, the module 40 is accommodated between the insulating resin portions 22 of the adjacent unit cells 21.

  As shown in FIG. 12, the cover 63 is integrally formed on the left side edge of the placement portion 62 via a flexible hinge 69. On the right edge of the cover 63, a locking portion 71 is formed to be locked to the locked portion 70 formed on the right edge of the mounting portion 62. The cover 63 is mounted on the mounting portion 62 as shown in FIGS. 8 and 10 by bending the hinge 69 and locking the locking portion 71 and the locked portion 70 in the vertical direction. The FPC 41 is fixed to the mounting portion 62 while covering the upper surface of the FPC 41. That is, the FPC 41 is surrounded by the connecting unit 61 over the entire circumference by fixing the cover 63 to the placement portion 62.

  A plurality of engaged portions 72 are formed on both side edges of the cover 63 in the left-right direction. As shown in FIG. 9, the engaged portion 72 is formed so as to protrude outward in the left-right direction from the hinge 69 and the locking portion 71 of the cover 63. As shown in FIG. It is formed to be able to engage with the joining piece 25. Thereby, while a pair of engagement piece 25 positions the connection unit 61 in the left-right direction with respect to the cell group 20, the engagement piece 25 and the engaged part 72 are engaged in the up-down direction, The connection unit 61 (resin protector 60) is held by the unit cell group 20. The engaged portion 72 is slidable in the front-rear direction between the engagement pieces 25 of each unit cell 21, and the battery wiring module 40 can be slid in the front-rear direction with respect to the unit cell group 20. ing.

The battery module 10 of the present embodiment has the structure as described above. Next, an example of an assembly procedure of the battery module 10 will be briefly described.
First, as shown in FIG. 13, the connecting units 61 with the cover 63 opened are arranged in the front-rear direction, and the FPC 41 in which the introduction pieces 44 are formed on both sides in the left-right direction of the FPC main body 43 is prepared. Then, the introduction piece 44 of the FPC 41 is inserted into the introduction piece insertion hole 67 formed in the placement portion 62 of the connection unit 61, and the FPC 41 is placed on the upper surface of the placement portion 62 as shown in FIG.

  Next, the hinge 69 of the connecting unit 61 is bent so that the cover 63 is covered with the mounting portion 62 so as to cover the upper surface of the FPC 41 mounted on the mounting portion 62, and the locking portion 71 of the cover 63 is mounted. Engage with the locked portion 70 of the mounting portion 62. Thus, as shown in FIGS. 7 and 9, the FPC 41 arranged in the connection unit 61 is surrounded by the resin protector 60 over the entire circumference, and each connection unit 61 is connected by the FPC 41. Thus, the battery wiring module 40 is completed. Here, since the FPC 41 is surrounded by the resin protector 60 over the entire circumference, the FPC 41 can be prevented from coming into contact with other members, and the FPC 41 can be prevented from being damaged.

  When the battery wiring module 40 is completed, as shown in FIG. 6, each unit cell 21 is moved back and forth with a slight space between each unit cell 21 so that the overhanging terminal 23 </ b> A is arranged on the front side. Arranged in the direction, the battery wiring module 40 is assembled from above. Specifically, the elastic portion 66 is elastically deformed so that the introduction piece 44 of the battery wiring module 40 is disposed between the single cells 21, and the metal of the introduction piece 44 is formed in the terminal accommodating portion 26 of the extension terminal 23 </ b> A. Positioning in the front-rear direction is performed so that the terminal 46 can be inserted, and the battery wiring module 40 is assembled on the upper surface of the unit cell 21, and at the same time, the gap between the unit cells 21 is closed. In this way, as shown in FIG. 5, the front surface of the overhanging terminal 23A of the adjacent unit cell 21 and the rear surface of the flat terminal 23B are connected to be conductive, and the front surface of the metal terminal 46 and the flat terminal 23B are connected. The battery module 10 is completed by connecting the rear surface. In addition, when a plurality of unit cells 21 are assembled in a stacked state, a deviation occurs between the unit cells 21 due to manufacturing tolerances and assembly tolerances of each unit cell 21. According to the present embodiment, the gap interval The elastic portion 66 as the adjusting means 65 is elastically deformed in the front-rear direction, which is the stacking direction of the single cells 21, so that the divided mounting portion 64 is displaced in the front-rear direction, and manufacturing tolerances and assembly tolerances between the single cells 21 are reduced. It can be absorbed.

  As described above, according to the present embodiment, the introduction piece 44 is introduced into the terminal accommodating portion 26 of the overhanging terminal 23A provided between the adjacent unit cells 21, and the unit cells 21 are connected in series. By holding the metal terminal 46 between the rear surface of the flat terminal 23B and the rear inner surface of the terminal accommodating portion 26, the metal terminal 46 and the flat terminal are brought into contact with the front surface of the metal terminal 46 and the rear surface of the flat terminal 23B in the front-rear direction. 23B can be reliably connected. Therefore, the metal terminal 46 and the flat terminal 23B can be connected to each other without using a biasing member that biases the metal terminal 46 to the electrode terminal 23. Thereby, the voltage detection of each cell 21 can be performed reliably.

In addition, since the introduction piece 44 can be introduced into the terminal accommodating portion 26 between the single cells 21 to connect the metal terminal 46 and the flat terminal 23B, the voltage detection terminal can be secured by tightening the nut to the electrode terminal as in the prior art. There is no need to connect the electrode terminal to the electrode terminal, and the connection work can be easily performed.
In addition, since the number of parts of the battery wiring module 40 can be reduced as compared with a conventional battery wiring module having a bus bar for connecting electrode terminals, the manufacturing cost of the battery wiring module 40 can be reduced, and the battery The wiring module 40 can be reduced in weight.
Furthermore, according to the present embodiment, the use of the flexible printed circuit board 41 eliminates the need for a work process for bundling electric wires as compared to the collective conductive line formed by the wire harness bundling the electric wires, and the battery wiring module 40. Can be further reduced in weight.

In addition, according to the present embodiment, the metal terminal 46 is accommodated in the terminal accommodating portion 26 and the metal terminal 46 and the flat terminal 23B are connected, so the front surface of the overhanging terminal 23A and the flat terminal 23B are configured. The overhanging terminal 23 </ b> A and the flat terminal 23 </ b> B can be connected without sandwiching the voltage detection terminal portion with the rear surface. Thereby, it can suppress that a clearance gap produces between the front surface of 23 A of overhanging terminals, and the rear surface of the flat terminal 23B, and can make the connection state between the electrode terminals 23 favorable.
In addition, according to the present embodiment, the elastic portion 66 that is the gap interval adjusting means 65 is elastically deformed in the front-rear direction that is the stacking direction of the single cells 21, so that the divided placement portion 64 can be displaced in the front-rear direction. Therefore, manufacturing tolerances and assembly tolerances between the plurality of single cells 21 can be absorbed.

  By the way, when a large current flows through the unit cells 21 connected in series and heat is generated, the unit cells 21 expand in the front-rear direction, so that the gap dimension (pitch) in the front-rear direction in the internal space of the terminal accommodating portion 26 is narrow. There is a case. In this regard, according to the present embodiment, the front surface of the metal terminal 46 is elastically deformed into the bending space 46 </ b> A, thereby absorbing the gap in the gap size in the front-rear direction in the internal space of the terminal accommodating portion 26. The contact state with the rear surface of the flat terminal 23B can be favorably maintained. Thereby, it is possible to reliably suppress the formation of a gap between the front surface of the overhanging terminal 23A and the rear surface of the flat terminal 23B, and to improve the connection state between the electrode terminals 23.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.
The battery module 110 according to the present embodiment is obtained by changing the shape of the pair of engaging pieces 25 and the terminal accommodating portion 26 of the single battery 21 and the battery wiring module 40 according to the first embodiment. And since it overlaps about the structure, the effect | action, and effect which are common in the said embodiment, the description is abbreviate | omitted. Moreover, the same code | symbol shall be used about the same structure as the said embodiment. In the following description, the vertical direction is based on the vertical direction in FIG. 20, the horizontal direction is based on the horizontal direction in FIG. 20, and the front-back direction is based on the horizontal direction in FIG.

  As shown in FIGS. 18 to 20, the pair of engaging pieces 125 of the unit cell 21 according to the second embodiment is configured to rise straight up to the tip of the engaging piece 125, and is implemented between the engaging pieces 125. The battery wiring module 140 according to the second embodiment is arranged. That is, unlike the first embodiment, the pair of engagement pieces 125 do not hold the battery wiring module 140, and the inner surfaces of both the engagement pieces 125 and the left and right ends of the battery wiring module 140 are in the left-right direction. The battery wiring module 140 is positioned with respect to the unit cell group 20 in the left-right direction.

  As shown in FIGS. 21 and 27, the terminal accommodating portion 126 of the unit cell 21 according to the second embodiment has an engaging protrusion 126 </ b> A that protrudes forward at the center of the rear inner surface of the terminal accommodating portion 126.

Similar to the battery wiring module 40 of the first embodiment, the battery wiring module 140 according to the second embodiment is attached to the upper surface of the unit cell group 20 as shown in FIGS. 1 and 3.
The battery wiring module 140 includes an FPC 141 (an example of an “aggregate conductive line” of the present invention) and an electronic component protection film 160 (an “insulating support member” of the present invention) that surrounds the upper and lower surfaces of the FPC main body 43 of the FPC 141. An example). The conductive path 42 in the second embodiment is not shown.

  As shown in FIG. 22, the introduction pieces 144 integrally connected to the FPC main body 43 form substantially U-shaped cuts penetrating the FPC 41 in the vertical direction on both sides of the FPC main body 43 in the left-right direction. The portion surrounded by the cuts is formed by bending downward. Therefore, the left and right end portions of the introduction pieces 144 aligned in a straight line in the front-rear direction are connected in the front-rear direction. Accordingly, the introduction piece 144 has an end portion on the opposite side to the FPC main body portion 43 in the introduction piece 144 on the FPC main body portion 43 side as compared with the introduction piece 144 in which both right and left ends of the introduction piece are not connected in the front-rear direction. It is possible to suppress the bending of the introduction piece 144 so as to go.

  As shown in FIGS. 21, 23, and 24, the introduction piece 144 includes a dish-shaped metal terminal 146, a pair of connection detection terminals 147 disposed above the metal terminal, and a block-shaped temperature sensor 148. And have.

  The metal terminal 146 is connected to an electrode pad (not shown) of the introduction line portion 45 formed on the introduction piece 144. As shown in FIGS. 21 and 25, the metal terminal 146 has a rear protrusion 146 </ b> B that protrudes rearward so as to incline toward the rear from a position slightly inside the outer peripheral edge of the metal terminal 146. The front protrusion 146A is inclined further inwardly toward the front from the rear end of the rear protrusion 146B and protrudes forward from the outer peripheral edge.

  In addition, the engagement protrusion 126A of the terminal accommodating portion 126 can be accommodated inside the front protruding portion 146A, and the rear protruding portion of the metal terminal 146 and the terminal accommodating portion 126 are engaged as shown in FIG. Engagement with the protrusion 126 </ b> A prevents the metal terminal 146 from being displaced in the terminal accommodating portion 126.

  In addition, as shown in FIGS. 23 and 25, a plurality of slits 146C are formed at intervals in the circumferential direction on the front projecting portion 146A. By narrowing the gap interval between these slits 146C, The protrusion 146A is elastically deformed rearward.

  The distance in the front-rear direction between the front end portion of the front protrusion 146A and the rear end portion of the rear protrusion 146B in the metal terminal 146 is set to be substantially the same as the depth dimension of the terminal accommodating portion 126 in the front-rear direction. Here, “substantially the same” means that the depth dimension in the front-rear direction of the terminal accommodating portion 126 is the same as the distance in the front-rear direction between the front end portion of the front protruding portion 146A and the rear end portion of the rear protruding portion 146B in the metal terminal 146. The depth dimension of the terminal accommodating part 126 in the front-rear direction includes a case where the metal terminal 146 is slightly smaller than the distance in the front-rear direction between the front end part of the front protrusion part 146A and the rear end part of the rear protrusion part 146B.

  That is, when the battery wiring module 140 is attached to the unit cell group 20 and the metal terminal 146 is accommodated in the terminal accommodating portion 126, the metal terminal 146 provided on the introduction piece 144 is adjacent to the adjacent terminal 144 as shown in FIG. The rear surface of the flat terminal 23B of the unit cell 21 and the rear inner surface of the terminal accommodating portion 126 are sandwiched, and the rear surface of the flat terminal 23B of the unit cell 21 and the front protruding portion 146A of the metal terminal 146 contact in the front-rear direction. At the same time, the front surface of the overhanging terminal 23A and the rear protrusion 146B of the metal terminal 146 are in contact with each other in the front-rear direction, so that the metal terminal 146 is connected to the flat terminal 23B and the overhanging terminal 23A in a conductive manner. Yes.

If the depth dimension in the front-rear direction of the terminal accommodating portion 126 is slightly smaller than the distance in the front-rear direction between the front end portion of the front protruding portion 146A and the rear end portion of the rear protruding portion 146B in the metal terminal 146, the metal The front projecting portion 146A of the terminal 146 is elastically deformed rearward so that no gap is generated between the front surface of the overhanging terminal 23A and the rear surface of the flat terminal 23B, and the rear surface of the overhanging terminal 23A and the rear surface of the flat terminal 23B. And are to be connected.
Further, even when the cell 21 expands in the front-rear direction due to heat or the like, and the gap dimension (pitch) in the front-rear direction in the internal space of the terminal accommodating portion 126 becomes narrower, the front protrusion 146A of the metal terminal 146 is rearward By being elastically deformed, it is possible to absorb the gap in the gap size in the front-rear direction in the internal space of the terminal accommodating portion 126 and to maintain the contact state between the metal terminal 146, the flat terminal 23B, and the overhanging terminal 23A in a favorable manner. . Thereby, it is possible to suppress the formation of a gap between the front surface of the overhanging terminal 23A and the rear surface of the flat terminal 23B, and to improve the connection state between the electrode terminals 23.

  The pair of connection detection terminals 147 are arranged at both ends in the left-right direction of the introduction piece 144, and are connected to the terminals of the introduction line portion 45 for connection detection different from the introduction line portion 45 for voltage detection. As shown in FIG. 21, both connection detection terminals 147 contact the rear surface of the flat terminal 23 </ b> B together with the metal terminals 146 in the terminal accommodating portion 126 when the battery wiring module 140 is attached to the unit cell group 20. In addition, both connection detection terminals 147 are set to be short-circuited. That is, when both the connection detection terminals 147 are short-circuited, it is possible to detect that the metal terminal 146 and the flat terminal 23 </ b> B are connected so as to be conductive between the adjacent unit cells 21.

  The temperature sensor 148 is arranged above the metal terminal 146 in the introduction piece 144 and between the connection detection terminals 147, and is introduced for a temperature sensor different from the voltage detection and connection detection introduction line portions 45. It is connected to the line part 45. Further, the temperature sensor 148 is provided on the introduction piece 144 arranged at the front end portion and the substantially central portion of the FPC 41. Note that the temperature sensor 148 can be provided on any introduction piece 144 as necessary, such as every predetermined number of introduction pieces 144.

  As shown in FIG. 21, the temperature sensor 148 is arranged in a non-contact state with the electrode terminals 23 in the terminal accommodating portion 126 when the battery wiring module 140 is attached to the unit cell group 20. The temperature information obtained by the temperature sensor 148 is taken into the ECU through the lead-in line portion 45 and the conductive path 42, and the temperature of the unit cell group 20 is detected by the ECU.

  On the other hand, the electronic component protection film 160 has a shape that is longer in the front-rear direction than the FPC main body 43 of the FPC 141, and is formed so as to sandwich the FPC main body 43 from both sides in the vertical direction. The electronic component protective film 160 holds the FPC 141 and protects the upper and lower surfaces of the FPC main body 43 by adhering in the vertical direction at positions outside the front and rear ends of the FPC main body 43. An electronic component (not shown) is connected to the upper surface of the FPC main body 43 by a known technique such as reflow soldering. The electronic component is protected by an electronic component protection unit 161 provided on the electronic component protection film 160. Covered from above. Thereby, it is possible to prevent other members from coming into contact with the electronic component, damaging the electronic component, or peeling the electronic component from the FPC main body 43.

  As described above, according to the battery module 110 of the present embodiment, the battery wiring module 140 is configured by the FPC 141 and the electronic component protective film 160. Therefore, for the battery in which the FPC is covered with a synthetic resin protector or the like. Compared to the wiring module, the battery wiring module 140 can be further reduced in weight.

<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 said embodiment, although the collective conductive line was comprised by the flexible printed circuit boards 41 and 141, this invention is not limited to such an aspect, For example, it comprises by the wire harness which bundled the electric wire. Also good.
(2) In the above embodiment, the metal terminals 46 and 146 are sandwiched between the adjacent overhanging terminal 23A and the flat terminal 23B, so that the metal terminals 46 and 146 and the flat terminal 23B are connected to be conductive. However, the present invention is not limited to such an embodiment. For example, biasing means is provided on the overhanging terminal, and the metal terminals 46 and 146 are connected to the flat terminal 23B by the biasing means. It is good also as a structure.

(3) In the above embodiment, the introduction pieces 44 and 144 are provided on both sides in the left-right direction of the FPC main body 43. However, the present invention is not limited to such an embodiment. You may comprise so that an introduction piece may be provided in one side edge of a part.
(4) In the above embodiment, the voltage detection terminal portion is configured by the metal terminals 46 and 146. However, the present invention is not limited to such an embodiment. For example, the protective film of the introduction piece 44 is peeled off. You may comprise a voltage detection terminal part by exposing metal foil.

20: Cell group 21: Cell 23C: Electrode terminal surface 26: Terminal accommodating portion (gap, recess)
40, 140: battery wiring module 42: conductive path 41, 141: flexible printed circuit board (collective conductive line)
45: Lead wire portion 46, 146: Metal terminal (voltage detection terminal portion)
65: Clearance interval adjusting means 60: Resin protector (insulating support member)
160: Electronic component protective film (insulating support member)

Claims (7)

By arranging a plurality of unit cells having positive and negative electrode terminal surfaces on the front and back, the unit cell group is formed by connecting the unit cells in series by bringing the electrode terminal surfaces of adjacent unit cells into contact with each other. A battery wiring module to be attached,
A collective conductive line formed by aggregating a plurality of conductive paths formed extending in the stacking direction of the unit cells;
An introduction line portion provided at one end of the conductive path and introduced into a gap between the unit cells for each predetermined number of the unit cells;
An insulating support member for holding the collective conductive line;
A battery wiring module comprising a voltage detection terminal portion provided in the lead-in portion and connected to the electrode terminal surface of the unit cell.   2. The battery wiring module according to claim 1, wherein the collective conductive line is formed of a flexible printed board, and the lead-in portion extends integrally from the conductive path of the flexible printed board.   3. The battery wiring module according to claim 1, wherein the voltage detection terminal portion is sandwiched in the stacking direction of the unit cells by the electrode terminal surfaces of the adjacent unit cells.   The said voltage detection terminal part is formed of the metal terminal inserted in the recessed part formed in the edge of the said electrode terminal surface of the said cell, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The battery wiring module according to item.   The battery wiring module according to claim 4, wherein the metal terminal is formed to be elastically deformable in a stacking direction of the unit cells. The collective conductive line is formed of a flexible printed circuit board,
The introduction line portion is integrally extended from the conductive path of the flexible printed circuit board,
6. The battery according to claim 1, wherein the lead-in portions are staggered in a direction in which the collective conductive line extends on both sides in the long side direction of the collective conductive line. Wiring module. The insulating support member is provided with a plurality of support portions for supporting the lead-in wire portion, and a gap interval adjusting means is integrally provided for each region including the support portions, and the regions are stacked on each other. The battery wiring module according to any one of claims 1 to 6, wherein the battery wiring module is displaceable along a direction.

Images