JP5787140B2 - Battery wiring module - Google Patents

Description

  The present invention relates to a battery wiring module.

  In battery modules for electric vehicles and hybrid vehicles, a plurality of single cells having positive and negative electrode terminals are arranged side by side, and electrode terminals of adjacent single cells are connected by a connecting member (bus bar). Thus, a plurality of single cells are connected in series or in parallel (see Patent Document 1).

  Here, in order to simplify the attachment work of the connection member, as shown in Patent Document 2, a plurality of battery wiring modules in which the connection member is accommodated in a plurality of resin connection units and these connection units are connected to each other are provided. It was considered to be attached to a single cell of this.

  And each connection unit is provided on the base made of synthetic resin, and insulation from the outside is ensured by housing the connection member in a wall portion (partition wall) surrounding the four sides. The connection member accommodated inside the portion is locked from above by a pair of locking projections protruding inside the wall portion.

Japanese Patent Application Laid-Open No. 11-067184 JP 2011-8957 A

By the way, in the structure of patent document 2, one of a pair of latching convex parts is provided in the front-end | tip part of a bending piece. This bending piece is formed inside both notches by providing a pair of notches penetrating the wall portion in a slit shape.
However, when such a notch is provided in the wall portion, there is a concern that the insulation between the connection member and the outside and the rigidity of the wall portion are reduced.

  This invention is completed based on the above situations, Comprising: It aims at providing the battery wiring module which can suppress a fall of insulation and rigidity.

The present invention provides a battery wiring module that is attached to a unit cell group in which a plurality of unit cells are arranged, and includes a conductive member that is electrically connected to a terminal of the unit cell, and a plurality of members that hold the conductive members. A holding portion, wherein the conductive member is a voltage detection terminal for detecting a voltage of the unit cell, and the holding portion is placed on the bottom portion on which the conductive member is placed, and the bottom portion. A partition wall that partitions the conductive member from the outside, and the partition wall is provided with an exposed portion that exposes the conductive member as seen from the outside of the partition wall, One rectangular corner of the rectangular plate portion of the voltage detection terminal is inserted so that the voltage detection terminal is inclined, and an auxiliary wall that covers at least a part of the exposed portion is provided.
According to this configuration, since the auxiliary wall that covers at least a part of the exposed portion of the partition wall is provided, it is possible to suppress a decrease in insulation and rigidity of the partition wall due to the exposed portion.

It is more preferable to have the following configuration in addition to the above configuration.
The plurality of conductive members are provided, and the plurality of conductive members include the voltage detection terminal and a connection member that connects between terminals of adjacent unit cells .
The auxiliary wall is provided on the outer surface side of the partition wall.
In this case, a case where a tool such as a socket wrench is inserted inside the partition wall when fastening with bolts or nuts can be considered, but in this case, the auxiliary wall does not get in the way.

-The partition wall is provided with a locking piece that can be bent and deformed to restrict the separation of the conductive member, and the exposed portion is provided around the locking piece to bend and deform the locking piece. This is a through hole that can be made.
In order to restrict the detachment of the conductive member, there may be provided a locking piece that can be bent and deformed on the partition wall. In this case, it is inevitable that the locking piece can be bent and deformed around the locking piece. An exposed portion is formed on the surface. According to this configuration, it is possible to suppress a decrease in insulation and rigidity of the partition wall due to the exposed portion while restricting the detachment of the conductive member by the locking piece.

The auxiliary wall is formed integrally with the partition wall.
The configuration for forming the auxiliary wall can be simplified.

The battery wiring module is configured by connecting a plurality of connection units, and the connection unit is provided with one or a plurality of holding portions.

  ADVANTAGE OF THE INVENTION According to this invention, the battery wiring module which can suppress the insulation and the fall of rigidity can be provided.

The top view which shows the battery module with which the battery wiring module which concerns on Embodiment 1 was attached. Plan view showing the battery wiring module The top view which expanded and represented the holding part in which the electrically-conductive member in the connection unit was accommodated AA sectional view of FIG. BB sectional view of FIG. A plan view schematically showing a state in which the connection unit and the end unit are coupled. A plan view showing the holding part of the connection unit in an enlarged manner A figure showing the auxiliary wall side surface of the holding part in the connection unit Bottom view showing enlarged holding part in connection unit The top view which shows the battery wiring module which concerns on Embodiment 2. Front view showing the battery wiring module Plan view showing the connection unit CC sectional view of FIG. The figure corresponding to BB sectional drawing of Drawing 3 concerning other embodiments. The figure corresponding to CC section of Drawing 12 concerning other embodiments

<Embodiment 1>
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the battery wiring module 20 of the present embodiment is attached to a unit cell group in which a plurality of unit cells 11 are arranged, so that a plurality of unit cells 11 are connected in series or in parallel. It constitutes.

The battery module 10 is used as a drive source of an electric vehicle or a hybrid vehicle, for example. In the following description, the front and rear direction will be described with the upper side in FIG. 1 as the front and the lower side as the rear, the front side in FIG. 1 as the upper side, and the back side of the paper as the lower side.
As shown in FIG. 1, the battery module 10 includes, for example, five (a plurality of) single cells 11 (single cell group) arranged side by side and a battery wiring module 20 attached to the five single cells 11. It is prepared for.

The unit cell 11 includes nut-shaped electrode terminals 12A and 12B (shown as 12A for the positive electrode and 12B for the negative electrode) and voltage detection that protrude perpendicularly from the end face of the rectangular parallelepiped main body in which the power generation element (not shown) is accommodated. It has an electrode 12C.
The direction of the polarity (positive / negative) of each unit cell 11 is arranged so that the unit cells 11 adjacent to each other are opposite to each other, so that the electrode terminals 12A and 12B having different polarities are adjacent to each other. ing. The plurality of single cells 11 are fixed by a holding plate (not shown).

The battery wiring module 20 holds a plurality of connection members 21 (an example of a “conductive member” having the configuration of the present invention) that connect the electrode terminals 12A and 12B adjacent to each other on the left and right sides, and is connected to the left and right sides. In addition, two (plural) connection units 23 and end units 40A and 40B provided at the end of the connection of the connection units 23 are provided.
The connection member 21 is made of a metal such as copper, copper alloy, aluminum, etc., and as shown in FIG. 3, the connection member 21 has a substantially rectangular plate shape, and has insertion holes 22 and 22 through which the shafts of bolts that are fastening members are inserted. Have.

  Each connection unit 23 is made of synthetic resin and has the same shape, and as shown in FIG. 6, has a shape bent in an L shape on the same plane, and is provided at the front and rear portions, respectively. 2 (plural) holding portions 24A and 24B that hold 21 and two (in the middle portion of the connection unit 23) that house voltage detection terminals 43 (an example of the “conductive member” that is the configuration of the present invention) A plurality of) detection housing portions 35, and two wire passage grooves 36 provided between the holding portions 24A and 24B and the detection housing portion 35 and through which the voltage detection wires W2 are passed.

  As shown in FIG. 7, the two holding portions 24 </ b> A and 24 </ b> B both surround the connecting plate 21 and the bottom plate 25 on which the connecting member 21 is placed (an example of the “bottom” that is the configuration of the present invention). And a partition wall 27 formed.

  The bottom plate 25 includes an intermediate support portion 25A that connects the front and rear partition walls 27 at the intermediate portion in the width direction, and a bottom edge portion 25B that slightly protrudes inward from the base end of the partition wall 27 at the left and right ends, A portion without the bottom plate 25 is an opening 26 in which the electrode terminals 12A and 12B are arranged.

  The partition wall 27 is connected so as to surround the connection member 21 at a height at which contact of the tool or the like is prevented in order to prevent the tool or the like from contacting the electrode terminals 12A and 12B and the connection member 21 and short-circuiting. An annular shape is provided around the member 21.

The annular partition wall 27 is formed in a rectangular tube shape by connecting a pair of opposing walls 28A, 28B extending in the left-right direction and a pair of side walls 34, 34 extending in the front-rear direction.
Locking pieces 29A and 29B for restricting the detachment of the connecting member 21 are provided at the intermediate portions in the left-right direction of the opposing walls 28A and 28B (above the end of the intermediate support portion 25A) so as to be able to bend and deform.

  As shown in FIG. 4, each of the locking pieces 29A and 29B includes a pair of left and right slits 30A and 30A and a notch 30B connecting the lower ends of the slits 30A and 30A, and penetrates the partition wall 27 in a U-shape. It is provided by forming an exposed hole 30 (an example of an “exposed portion” that is a configuration of the present invention).

  Below the locking pieces 29A and 29B (below the exposure hole 30), as shown in FIG. 9, a bottom plate 25 is cut into a rectangular shape to open a through hole 31. For example, when the connection unit 23 is formed using upper and lower molds, it becomes a mold punch hole for forming the locking pieces 29A and 29B.

  The locking pieces 29A and 29B are formed with a thickness that can be flexed and deformed in the front-rear direction, and as shown in FIG. 5, a thick portion 29C whose thickness dimension increases slightly downward toward the lower side (bottom plate side). Have As a result, the lower ends of the locking pieces 29 </ b> A and 29 </ b> B protrude inward from the position of the peripheral edge of the connection member 21. (The peripheral edge of the connecting member 21 is arranged below the claw-shaped edges of the locking pieces 29A and 29B). When the connecting member 21 is mounted, the locking pieces 29A and 29B are bent and deformed (elastically deformed). When the connecting member 21 is mounted at a predetermined position, the locking pieces 29A and 29B are restored and deformed. The detachment of the connecting member 21 is restricted.

  Here, of the pair of opposing walls 28A and 28B, the auxiliary wall 32 that covers the exposure hole 30 from the outer side is provided on the opposing wall 28A on the front side (located on the outer surface side of the battery wiring module 20). It is provided integrally with the opposing wall 28A (partition wall 27).

  The auxiliary wall 32 is provided in front (outside) of the outer surface of the opposing wall 28A, and is formed in a range including the entire width dimension of the exposure hole 30 in the left-right direction. The auxiliary wall 32 is formed at a predetermined interval with respect to the outer surface of the opposing wall 28A, and the interval between the auxiliary wall 32 and the partition wall 27 is narrowed to the left and right, and is connected to the partition wall 27 integrally. Thus, a communication hole 33 that communicates vertically is formed between the partition wall 27 and the auxiliary wall 32.

  As shown in FIG. 6, the detection accommodating portion 35 accommodates the voltage detection terminal 43 and has a recess connected to the wire passage groove 36, and is connected to the voltage detection electrode 12 </ b> C of the unit cell 11 in this recess. A rectangular hole is opened. The voltage detection terminal 43 is arranged so as to be engaged with the front and rear hole edges of the rectangular hole, and the voltage detection wire W2 is guided to the wire passage groove 36 through the recess.

The wire passage groove 36 extends to the left and right in each connection unit 23, and the wire passage groove 36 of the adjacent connection unit 23 is connected by connecting the connection units 23.
Although not shown, each connection unit 23 (and the end units 40A and 40B) has a coupling engagement portion provided on one side in the left-right direction and an adjacent connection unit 23 (on the other side in the left-right direction). Alternatively, a connected engaged portion that engages with the end units 40A and 40B) is provided, and the connecting engaged portion and the connected engaged portion engage with each other with a clearance, so that the left and right connecting units are engaged. 23 is connected.

  The voltage detection terminal 43 is for measuring the voltage of the unit cell 11, and as shown in FIG. 1, the voltage detection terminal 43 has a rectangular shape having an insertion hole 43A at the center, and is connected to the terminal of the voltage detection electric wire W2. Connected by crimping or the like. The voltage detection electric wire W2 is a covered electric wire in which a core wire (conductor) is covered with an insulating layer, and at the terminal, the insulating layer is peeled off and the core wire is exposed.

  The voltage detection wire W2 is collected in the wire passage groove 36 and led to a battery ECU (not shown). The battery ECU is equipped with a microcomputer, an element, and the like, and has a function for detecting voltage, current, temperature, etc. of the unit cells 11 and controlling charge / discharge of each unit cell 11. Of the configuration.

  The end unit 40A, 40B is a synthetic resin member provided at each end of the connection of the plurality of connection units 23, and accommodates rectangular terminal fittings 41A, 41B, respectively. The terminal fittings 41A and 41B are provided with insertion holes 42A and 42B through which a shaft portion of a bolt as a fastening member is inserted, and an electric wire W1 connected to an inverter or the like is connected by crimping or the like. One end unit 40B is provided with a detection accommodating portion 35 in which the voltage detection terminal 43 is accommodated.

Next, attachment of the battery wiring module 20 will be described.
In the present embodiment, the connection units 23 and 23 and the end units 40A and 40B are engaged with the connection units 23 by engaging the connection engaging portions (not shown) with the connection engaged portions for the plurality of connection units 23 (FIG. 6).
Next, the connection members 21 and the terminal fittings 41A and 41B are accommodated for all the connection units 23 and the end units 40A and 40B (FIG. 2), and the voltage detection terminals 43 are crimped to the terminal portions of the voltage detection wires W2. It is accommodated in the detection accommodating portion 35 and is passed through the wire passage groove 36.

  Next, all the insertion holes 22, 22, 42 </ b> A, 42 </ b> B, 43 </ b> A of the connection member 21, the terminal fittings 41 </ b> A, 41 </ b> B, and the voltage detection terminal 43 accommodated in the battery wiring module 20 are connected to the plurality of single cells 11 (single cell group). The bolt terminals of all the electrode terminals 12A to 12C are screwed into the nut-like electrode terminals 12A and 12B and tightened. When everything is tightened, the battery module 10 is completed (FIG. 1).

According to the structure of the said embodiment, there exist the following effects.
(1) A battery wiring module 20 attached to a unit cell group in which a plurality of unit cells 11 are arranged, and a connection member 21 (conductive) electrically connected to the electrode terminals 12A and 12B (terminals) of the unit cell 11 Member) and a plurality of holding portions 24A and 24B for holding each connection member 21. The holding portions 24A and 24B are provided on the bottom portion 25 on which the connection member 21 and the voltage detection terminal 43 are placed, and on the bottom portion 25, respectively. And a partition wall 27 that partitions the placed connection member 21 and the voltage detection terminal 43 from the outside, and the partition wall 27 is exposed so that the connection member 21 is exposed when viewed from the outside of the partition wall 27. A hole 30 (exposed portion) is provided, and an auxiliary wall 32 that covers at least a part of the exposed hole 30 is provided.
According to the present embodiment, since the auxiliary wall 32 that covers at least a part of the exposure hole 30 is provided on the outer surface side of the partition wall 27, it is possible to suppress a decrease in insulation and rigidity of the partition wall 27 due to the exposure hole 30. can do.
(2) Since the auxiliary wall 32 is provided on the outer surface side of the opposing wall 28A (partition wall 27), it is conceivable that a tool is inserted inside the partition wall 27. In this case, the auxiliary wall 32 is an obstacle. Never become.

(3) The opposing wall 28A (partition wall 27) is provided with a locking piece 29A for restricting the detachment of the connecting member 21 so as to be able to bend and deform, and the exposure hole 30 is provided around the locking piece 29A. This is a through hole that allows the locking piece 29A to be bent and deformed.
In order to restrict the detachment of the connecting member 21, the partition wall 27 may be provided with a locking piece 29A that can be bent and deformed. In this case, the locking piece 29A can be bent and deformed around the locking piece 29A. Therefore, the exposure hole 30 is inevitably formed. According to the present embodiment, it is possible to suppress a decrease in insulation and rigidity of the partition wall 27 due to the exposure hole 30 while restricting the detachment of the connection member 21 by the locking piece 29A.
(4) Since the auxiliary wall 32 is formed integrally with the partition wall 27, the configuration for forming the auxiliary wall 32 can be simplified.

<Embodiment 2>
The second embodiment will be described with reference to FIGS. In the following, the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
As shown in FIG. 10, the battery wiring module 50 includes a connection unit 51 configured by connecting a plurality of connection units made of synthetic resin to the left and right, and electrode terminals that are accommodated in the connection unit 51 and are adjacent to the left and right. A plurality of connection members 61 (an example of “conductive member” having the configuration of the present invention) for connecting between 12A and 12B, a voltage detection terminal 43 arranged in an intermediate portion of the connection connection unit 51, and each connection member And a voltage detection terminal 63 (an example of a “conductive member” which is a configuration of the present invention) arranged to overlap with 61.
The connecting member 61 is made of a metal such as copper, copper alloy, or aluminum, has a generally rectangular plate shape, and oval insertion holes 62 and 62 that are long in the left-right direction can be inserted through a shaft portion of a bolt as a fastening member. It has become.

As shown in FIG. 12, the connecting and connecting unit 51 includes a plurality of holding portions 52 that are provided in two rows of the front portion and the rear portion and hold the connecting member 51, and a voltage detection terminal 43 that is provided in the middle portion. It has the accommodating part 35 for a detection accommodated, and the electric wire through groove 36 provided between the holding | maintenance part 52 and the accommodating part 35 for a detection, and the electric wire W2 for voltage detection is distribute | arranged.
Each holding portion 52 includes a bottom plate 53 on which the connection member 21 is placed, and a partition wall 54 formed so as to surround the connection member 21.

  The partition wall 54 is provided with a locking piece 55 that restricts the detachment of the connection member 21 so as to bend and deform. The locking piece 55 is provided by penetrating the exposure hole 30 in a U shape with respect to the partition wall 54.

On the outer surface of the partition wall 54, an auxiliary wall 32 that covers a part of the exposure hole 30 from the outer side is provided integrally with the partition wall 54.
Further, the partition wall 54 is formed with a recess 58 into which a corner of the voltage detection terminal 63 is fitted, and as shown in FIG. 13, an exposure hole through which one corner 63A of the voltage detection terminal 63 is inserted. 59 (an example of an “exposed portion” that is a configuration of the present invention) is provided through the partition wall 54.

In the partition wall 54, an auxiliary wall 60 that covers a portion on the lower end side of the exposure hole 59 is provided on the outer surface side of the exposure hole 59.
When the voltage detection terminal 63 is accommodated, the auxiliary wall 60 is located below one corner 63A of the voltage detection terminal 63.

As shown in FIG. 10, the voltage detection terminal 63 is stacked on the left side (one side in the left-right direction) of the connection member 61 in an inclined posture, and has a rectangular flat plate portion and a rear portion of the flat plate portion. And a wire connection portion to which the voltage detection wire W2 is connected.
The flat plate portion has a circular terminal insertion hole 65 at the center, and two corner portions are placed on the bottom of the recess 58 and one corner portion is inserted into the exposure hole 59.

  Although not shown, each connection unit is provided with a connection engagement portion provided on one side in the left-right direction and a connection engaged portion provided on the other side in the left-right direction to engage with the adjacent connection unit. In this case, the left and right connection units are connected to each other by engaging the connection engaging portion and the connection engaged portion with a clearance.

<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 above embodiment, the connecting member 21 connects (series connection) the electrode terminals 12A and 12B having different polarities, but is not limited thereto, and the electrode terminals 12A and 12A having the same polarity (12B and 12B). ) May be connected (parallel connection). For example, another cell 11 is connected in parallel to the battery module 10 of the above embodiment, and the electrode terminals 12A and 12A having the same polarity in this parallel connection are connected by a plurality of connection members 21 (battery wiring module 20). You may have done.

(2) Although the number of the single cells 11 constituting the battery module 10 is five, the number is not limited to this, and may be six or more or four or less, and the connection unit 23 attached to the single cell group according to this. The number is not limited to two in the above embodiment, but may be one or three or more.
(3) In the above-described embodiment, the battery wiring module 20 is configured by connecting a plurality of separate connection units 23. However, the present invention is not limited to this. For example, the battery wiring module 20 can be connected with a single (integrated) connection plate. A module may be configured, and the connection member 21 may be held by the plurality of holding portions 24A and 24B of the connection plate.

(4) In the above embodiment, the exposure hole 30 of the partition wall 27 is provided by forming the locking pieces 29A and 29B. However, the present invention is not limited to this, and other parts (provided in the above embodiment) are provided. An auxiliary wall 32 may be provided with respect to the exposure hole 30 provided to form a portion that may not be formed).
(5) In the above embodiment, the auxiliary wall 32 is provided on the outer wall (front side) facing wall 28A. However, an auxiliary wall may also be provided on the inner wall side (rear side) facing wall 28B. However, since the outer surface side is more likely to have a problem due to the lowering of the insulating property than the inner surface side where the possibility of contact with other members is low, the auxiliary wall on the opposing wall 28A on the outer surface side as in the above embodiment. Providing 32 is more effective for improving insulation.

(6) In the above-described embodiment, the partition wall 27 surrounds the connection member 21 over the entire circumference. However, the partition wall 27 is not limited to this. For example, if the partition wall 27 partitions at least the connection member 21 and the outside, for example, You may have a part in which the partition wall is not provided among the perimeters of the connection member 21. FIG.

(7) In the first embodiment, the communication wall 33 between the partition wall 27 and the auxiliary wall 32 is not closed up and down. However, the present invention is not limited to this. For example, as shown in FIG. It is good also as a shape which block | closed between the upper part of this and the upper part of the auxiliary wall 32 (connected).
(8) In Embodiment 2, the auxiliary wall 60 is configured to cover a part of the exposure hole 59, but the upper end of the auxiliary wall 70 extends above the upper end of the exposure hole 59 as shown in FIG. 15. The auxiliary wall 70 may cover the entirety of the exposure hole 59 by protruding, and the voltage detection terminal 63 (the corner 63A thereof) may be hidden inside the auxiliary wall 70.

DESCRIPTION OF SYMBOLS 10 ... Battery module 11 ... Cell 12A, 12B ... Electrode terminal 12C ... Electrode for voltage detection 20, 50 ... Battery wiring module 21, 61 ... Connection member (conductive member)
23 ... Connection units 24A, 24B ... Holding parts 25, 53 ... Bottom plate (bottom part)
26 ... Openings 27, 54 ... Partition walls 28A, 28B ... Opposing walls 29A, 29B, 55 ... Locking pieces 29C ... Thick parts 30, 59 ... Exposed holes (exposed parts)
30A, 30A ... slit 30B ... notch 31 ... through hole 32, 60, 70 ... auxiliary wall 33 ... communication hole 34, 34 ... side wall 40A, 40B ... end unit 41A, 41B ... terminal fitting 43, 63 ... voltage detection terminal (Conductive member)
51 ... Connection unit 63A ... Corner W1 ... Electric wire W2 ... Electric wire for voltage detection

Claims (6)

A battery wiring module that is attached to a cell group in which a plurality of cells are arranged,
A conductive member electrically connected to a terminal of the unit cell;
A plurality of holding portions for holding each conductive member,
The conductive member is a voltage detection terminal for detecting the voltage of the unit cell,
The holding portion includes a bottom portion on which the conductive member is placed, and a partition wall that partitions the conductive member placed on the bottom portion from the outside.
The partition wall is provided with an exposed portion that is exposed so that the conductive member appears when viewed from the outside of the partition wall, and the exposed portion is a right-angled corner of the rectangular flat plate portion of the voltage detection terminal. The part is inserted and the voltage detection terminal is inclined , and
A battery wiring module having an auxiliary wall covering at least a part of the exposed portion. 2. The battery wiring module according to claim 1, wherein the conductive member includes a plurality of conductive members, and the plurality of conductive members include the voltage detection terminal and a connection member that connects between terminals of adjacent unit cells. . The battery wiring module according to claim 1, wherein the auxiliary wall is provided on an outer surface side of the partition wall. The partition wall is provided with a locking piece that can be bent and deformed so as to restrict the separation of the conductive member, and the exposed portion is provided around the locking piece and can be bent and deformed. The battery wiring module according to any one of claims 1 to 3, wherein the battery wiring module is a through hole. The battery wiring module according to any one of claims 1 to 4, wherein the auxiliary wall is formed integrally with the partition wall. 6. The battery wiring module according to claim 1, wherein the battery wiring module is configured by connecting a plurality of connection units, and the connection unit is provided with one or a plurality of holding portions. The battery wiring module as described.

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