JP5811396B2 - Battery wiring module - Google Patents

Description

  The present invention relates to a battery wiring module.

  2. Description of the Related Art Battery modules for electric vehicles and hybrid vehicles are arranged by stacking a plurality of unit cells each having a flat main body having a power generation element therein and positive and negative electrodes. A plurality of single cells are connected in series or in parallel by connecting the electrodes of the adjacent single cells with a connecting member (bus bar).

  Patent Document 1 listed below describes a battery wiring module configured by incorporating a large number of bus bars into a synthetic resin substrate portion by insert molding. Each battery cell is connected by attaching this battery wiring module to the cell group, inserting electrode bolts of each battery cell into electrode holes formed in each bus bar, and tightening the bus bar with nuts.

JP 2000-149909 A

  In order to attach such a battery wiring module to the unit cell group, it is necessary to insert the electrode bolt of each unit cell into the connection hole formed in each bus bar. When mounting, all bus bar connection holes must be aligned with all electrode bolts.

  However, in practice, it is difficult to match the positions of the connection holes of the bus bars and the electrode bolts all together due to manufacturing errors and assembly errors due to dimensional tolerances set for each unit cell and battery wiring module. For this reason, conventionally, after repeating the work of inserting the electrode bolt through the connection hole after aligning the connection hole with each electrode bolt of each unit cell for each bus bar, the nut is screwed onto the connection hole. The fact was that he was forced to do the troublesome work of doing.

  The present invention has been completed based on the above situation, and an object thereof is to improve the workability of mounting a battery wiring module.

The present invention is a battery wiring module attached to a unit cell group in which a plurality of unit cells having positive and negative electrode portions are arranged, the connection member connecting the electrode portions, and the connection member being held A protector, and when the protector is attached to the unit cell, the protector is fitted into a positioned portion formed in the unit cell before the connection member reaches a connection position with the electrode unit. A positioning portion is formed, the positioning portion is provided at a position protruding to the unit cell side from the connection member, and the positioned portion is a voltage detection provided in one unit cell. It is characterized by being an electrode part for use .

According to such a configuration, it is possible to improve the workability of attaching the battery wiring module to the single cell group. That is, since the positioning member and the positioned portion can collectively position the battery wiring module with respect to the unit cell, the connecting member and the electrode portion can be connected. There is no need to perform the troublesome work of matching. In particular, when the number of unit cells constituting the unit cell group is large, the working efficiency can be remarkably improved. In addition, since the positioning part is provided in the protector and the positioning part is fitted in the positioning part in advance to perform the approximate alignment, the connection work between the electrode part and the connection member is performed. There is no need to bring the electrode parts into contact with each other, and the possibility that they are damaged and the performance of the battery module is lowered can be reduced.
Further, if the positioned portion is an electrode for voltage detection, it is not necessary to newly provide a positioned portion on the unit cell side, and the versatility is excellent and the cost can be reduced. In addition, since the dimensional accuracy of the voltage detection electrode and each electrode portion is managed in the single cell regardless of the positioning portion, the dimensional accuracy of the positioned portion is newly (apart from the voltage detection electrode). There is no need to manage. If the positioning part is fitted with the voltage detection electrode whose dimensional accuracy has already been managed as a reference, the assembly error of the connecting member with respect to the electrode part becomes smaller, and the mounting workability can be further improved. it can.

  In addition, by forming the positioned part in the same unit cell as the electrode part that needs to be aligned, the assembly error of the connecting member to the electrode part after fitting the positioned part and the positioning part is reduced. It is possible to prevent the deterioration of the mounting workability due to the increase in the assembly error.

  It is desirable that the positioning portion is located closest to the unit cell when attached to the unit cell. According to such a configuration, when the battery wiring module is attached to the unit cell without being constrained by the unit cell side configuration, the positioning unit can first be fitted to the positioned unit. Excellent versatility.

  The positioning portion may be formed at a substantially central position of the protector in a direction intersecting with the arrangement direction of the unit cells. With such a configuration, for example, it is possible to reduce the assembling error of the protector with respect to the unit cell, compared with the case where it is provided at either end in the same direction, and the alignment between the connecting member and the electrode portion is easier. Can be.

  The positioning portion may be provided in the protector corresponding to each of the unit cells. With such a configuration, positioning can be performed for each unit cell, so that an assembly error between the connection member and the electrode portion can be minimized. That is, the closer the formation position of the positioning portion is to the connection member that needs to be aligned, the smaller the assembly error of the connection member with respect to the electrode portion can be suppressed. Therefore, if a positioning part is provided for each unit cell of the minimum unit, it is possible to suppress assembly errors and improve assembly workability.

The portion to be positioned is, one of the is provided between the electrode portion of the positive electrode and the negative electrode in a single cell, the positioning unit, the may form a fittable concave the portion to be positioned. With such a configuration, the distance from the positioned portion to the positive electrode portion and the distance from the positioned portion to the negative electrode portion can be made substantially the same distance. Assembling errors of the connecting members with respect to the electrode portions after the fittings can be suppressed in a well-balanced manner, and the mounting workability can be improved.

  The projecting end of the positioning part may be provided with a guiding inclined surface that inclines so as to widen the inside thereof. With such a configuration, when the positioning portion is fitted to the positioned portion, the positioned portion can be easily guided by the guiding inclined surface. Therefore, by improving the workability of fitting the positioning portion to the positioned portion, it is possible to improve the mounting workability of the battery wiring module as a whole.

The connecting member includes a connecting connecting member, the connecting connecting member is a of connecting between the electrode portions adjacent the plurality of unit cells, the protector is in the connection direction of the connecting connecting member The first unit holding one side and the second unit holding the other side in the connection direction of the connecting member for connection, at least one of the first unit and the second unit is the connecting unit it may be slidable in the connecting direction of the connecting connecting member to the connecting member.

According to such a configuration, even when an assembly error occurs between the plurality of single cells and the battery wiring module assembled thereto, at least one of the first unit and the second unit is a connecting member for connection. since that is configured to be slidable in the connecting direction of the connecting connecting member relative to the first unit via the connecting connecting member and the unit cells comprising a mating relative position between the second unit The position can be changed based on the positioned portion. Therefore, the assembly error with respect to the unit cell can be absorbed on the battery wiring module side, and a problem in assembling the battery wiring module due to both dimensional errors can be prevented.

The coupling connecting member is provided with an engaged portion, and at least one of the first unit and the second unit has a predetermined clearance in the connecting direction with respect to the engaged portion. An engaging portion that can be engaged may be provided. According to such a configuration, when the positioning portion is fitted to the positioned portion, the connecting connecting member can be slid within a predetermined clearance range. Therefore, even when an error each dimension between the electrode portions is caused, it is possible to move the connecting connecting member to the connecting direction at a predetermined range of the clearance, the mounting workability to the electrode portion of the connecting connecting member Can be improved.

  According to the present invention, the mounting workability of the battery wiring module can be improved.

The top view of the battery module which concerns on one Embodiment of this invention. Plan view with battery wiring module assembled Top view of bus bar The top view of the 1st unit which constitutes a protector, and the 2nd unit Side view Bottom view of first or second unit AA sectional view of FIG. FIG. 7 is a partial cross-sectional view of the battery wiring module attached to the unit cell group. BB sectional view of FIG. 9 is a partial cross-sectional view of the battery wiring module attached to the unit cell group in FIG.

<Embodiment>
An embodiment 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 to form a battery module 10. For example, it is used as a drive source for vehicles such as electric vehicles and hybrid vehicles. In the following description, the upper side of FIG. 1 is the front side, the lower side is the rear side, the left-right direction is the connection direction, the front side of the page is the upper side, and the back side of the page is the lower side.

(Battery module)
As shown in FIG. 1, the battery module 10 includes, for example, a plurality of unit cells 11 (corresponding to a unit cell group) arranged side by side, and a battery wiring module 20 attached to the plurality of unit cells 11. Configured.

(Single cell)
The unit cell 11 includes positive and negative electrode portions 12 and 13 protruding side by side before and after a predetermined surface (upper surface) of a rectangular parallelepiped main body portion in which a power generation element (not shown) is accommodated, and on the main body portion. In addition, a voltage detection electrode portion 14 is provided so as to protrude at a substantially intermediate position between the electrode portions 12 and 13. Each of the electrode portions 12, 13, and 14 is formed of a square tube nut (square nut), a screw hole is formed through the center, and the periphery excluding the upper and lower sides is covered with an insulating member made of synthetic resin. Portions 12A, 13A, and 14A.

  Each unit cell 11 is arranged side by side so that the front and rear direction of the adjacent unit cells 11 are opposite to each other, so that the polarities of the adjacent electrode parts 12 and 13 are different (the positive electrode and the negative electrode are in the side-by-side direction). (Alternately). The plurality of unit cells 11 are fixed by a holding plate (not shown).

(Battery wiring module)
As shown in FIGS. 1 and 2, the battery wiring module 20 includes a plurality of bus bars 21 (corresponding to connecting members) that connect between the electrode parts 12 and 13 that are adjacent to each other on the left and right sides, and a single battery that is stacked on each bus bar 21. 11, a plurality of voltage detection terminals 25 for detecting the voltage of 11, a plurality of intermediate voltage detection terminals 26 for detecting the voltage of the unit cell 11, which are superimposed on the voltage detection electrode portion 14, the bus bar 21, and each voltage And a synthetic resin protector 30 that accommodates the detection terminals 25 and 26.

(Bus bar)
The bus bar 21 is made of a metal such as copper, copper alloy, stainless steel (SUS), aluminum, and has a plate shape with a length corresponding to the dimension between the adjacent electrode portions 12 and 13 as shown in FIG. A pair of through holes 22 communicating with the screw holes of the electrode portions 12 and 13 is formed. The shape of the through-hole 22 is an oval shape whose longitudinal direction is the connecting direction (left-right direction in FIG. 3). Then, at the side edges along the connecting direction of the bus bar 21 and on both the front and rear sides of the through hole 22, an engaged recess 23 is cut out.

  As shown in FIG. 2, the bus bar 21 is entirely accommodated in a connecting bus bar 21A for connecting a first unit 31 and a second unit 40, which will be described in detail later, and the first unit 31 or the second unit 40. And the accommodating bus bar 21B. Both the connecting bus bar 21A and the housing bus bar 21B have the same shape as shown in FIG. In the present embodiment, among these bus bars 21, the engaged recess 23 provided in the connecting bus bar 21A corresponds to the engaged part.

(Voltage detection terminal)
Each voltage detection terminal 25, 26 is electrically connected to the corresponding electrode part 12, 13, 14 by a pair of voltage detection terminals 25, or the voltage detection terminal 25 and the intermediate voltage detection terminal 26, respectively. A desired voltage in the unit cell 11 is detected. First, the voltage detection terminal 25 superimposed on the bus bar 21 will be described. The voltage detection terminal 25 is provided with a rectangular flat plate portion and a crimp portion provided so as to protrude from the flat plate portion, and the voltage detection wire W1 is crimped to the crimp portion. Yes. An oblong insertion hole communicating with the screw hole of the electrode portion 12 and the through hole 22 is formed through the central portion of the flat plate portion.

  On the other hand, as shown in FIGS. 1 and 2, the intermediate voltage detection terminal 26 superimposed on the voltage detection electrode portion 14 has a rectangular flat plate portion 26 </ b> A slightly smaller than the flat plate portion of the voltage detection terminal 25 described above. A crimping part 26B provided so as to protrude from the flat plate part 26A is provided, and a voltage detection wire W2 is crimped to the crimping part 26B. An oblong insertion hole 26 </ b> C communicating with the screw hole of the voltage detection electrode portion 14 is formed through the central portion of the flat plate portion 26 </ b> A.

  The voltage detection wires W1 and W2 connected to the voltage detection terminals 25 and 26 are collected in a wire routing groove 36, which will be described later, and provided in a position on the right side of FIG. (Not shown). The battery ECU is equipped with a microcomputer, elements, and the like, and has a function of detecting the voltage, current, temperature, etc. of the unit cells 11 and performing monitoring control of each unit cell 11 and the like. The structure is made.

(Protector)
The protector 30 connects the first unit 31 that holds one side in the connecting direction (left-right direction) of the connecting bus bar 21A and the second unit 40 that holds the other side in the connecting direction of the connecting bus bar 21A. The plurality of units 31 and 40 connected to each other are further connected. That is, the protector 30 has a form in which a plurality of first units 31 and second units 40 are alternately connected. The first unit 31 and the second unit 40 have the same shape. For convenience, the first unit 31 is shown on the left side, and the second unit 40 is shown on the right side. The description will be made using the first unit 31, and the corresponding parts of the second unit 40 will be denoted by the same reference numerals and description thereof will be omitted.

  The first unit 31 is made of synthetic resin, and as shown in FIG. 4, the right end edge protrudes rightward from the front part toward the rear part, and the left end edge extends from the rear part to the front part. It has a shape that protrudes to the left with a step. The first unit 31 is provided with a pair of housing portions 32 for housing the housing bus bar 21 </ b> B and the voltage detection terminal 25 at both sides in the front-rear direction and at a substantially intermediate portion in the connection direction.

  A connecting portion 33 that holds one side of the connecting bus bar 21 </ b> A and receives the voltage detection terminal 25 in an overlapping manner is provided on each right side of the pair of receiving portions 32. Similarly, on each left side of the accommodating portion 32, a connected portion 34 that holds the other side of the connecting bus bar 21 </ b> A held by the connecting portion 33 of the second unit 40 is provided.

  Four intermediate accommodating portions 35 for accommodating the intermediate voltage detection terminals 26 are formed side by side in the intermediate portion in the front-rear direction of the first unit 31. Moreover, it is the both sides of the intermediate | middle accommodating part 35, Comprising: Between each intermediate | middle accommodating part 35 and the accommodating part 32 or the connection part 33, the electric wire W1, V1 for voltage detection connected to each voltage detection terminal 25 is provided. A wire routing groove 36 is provided in which W2 can be collected and routed to the battery ECU side.

  The housing 32 is provided with a bottom plate 32A on which the housing bus bar 21B is placed and a rectangular tubular partition wall 32B that surrounds the housing bus bar 21B. ing. The bottom plate 32A has a belt-like shape extending in the front-rear direction, and is opposed to the front-rear side only in a substantially intermediate part in the connecting direction so that the electrode parts 12, 13 including the electrode holding parts 12A, 13A can enter the housing part 32 from below. The lower end of the partition wall 32B to be connected is connected. In other words, the accommodating portion 32 has a pair of rectangular openings with the bottom plate 32A interposed therebetween.

  Above the bottom plate 32A, as shown in FIGS. 2 and 4, a pair of lock pieces 32C for locking the accommodating bus bar 21B fitted from above is provided. The lock piece 32C is formed by cutting out the partition wall 32B, and is an elastic piece that can be bent and deformed in the front-rear direction. The lock piece 32C is elastic so as to be pushed out of the housing portion 32 (partition wall 32B side) by the housing bus bar 21B. The insertion is allowed to be inserted and elastically restored to prevent the housing bus bar 21B from coming out upward.

  In the housing portion 32, a terminal holding portion 32D and a wire passage groove 32E for holding the voltage detection terminal 25 fitted from above the housing bus bar 21B are formed on the left side from the substantially middle portion in the connection direction. The terminal holding portion 32D has a posture in which the flat plate portion of the voltage detection terminal 25 is inclined obliquely with respect to the front-rear direction so that the voltage detection wire W1 connected to the voltage detection terminal 25 can be led out to the wire routing groove 36. It is to be held, and is composed of three concave portions having a triangular shape in a plan view that can be prevented from rotating by fitting corner portions of the flat plate portion. The wire passage groove 32E leads the crimp portion of the voltage detection terminal 25 and the voltage detection wire W1 crimped thereto to the wire routing groove 36, and communicates from the housing portion 32 to the wire routing groove 36. Is recessed.

  When the connecting portion 33 is connected to the connected portion 34, the connecting portion 33 is connected to the bottom plate 33 </ b> A on which the connecting bus bar 21 </ b> A is placed on the bottom plate 34 </ b> A (or below) of the connected portion 34 in the connecting direction. A partition wall 33B that surrounds the three sides on the left side from the substantially middle portion of the connecting bus bar 21A so as to open one end. Similar to the accommodating portion 32, the connecting portion 33 is formed with a terminal holding portion 33C and a wire passage groove 33D for holding the voltage detection terminal 25 fitted from above the held connecting bus bar 21A. Since the configuration is the same as the terminal holding portion 32D and the wire passage groove 32E of the housing portion 32, the description thereof is omitted.

  On the other hand, when connected to the connecting portion 33, the connected portion 34 has a bottom plate 34A on which the connecting bus bar 21A is placed under the bottom plate 33A of the connecting portion 33 (or above). A partition wall 34B that surrounds the three sides on the right side from the substantially middle part of the connecting bus bar 21A so as to open one end part in the connecting direction.

  In the connecting direction, a plurality of holding pieces 33E and 34C that form a pair project from the partition walls 33B and 34B located inside the bottom plates 33A and 34A. The holding pieces 33E and 34C are located on the upper side of the connecting bus bar 21A that is laterally inserted from the open ends of the connecting portion 33 and the connected portion 34, and the bottom plates 33A and 34A located on the lower side of the connecting bus bar 21A. It plays the role of holding the connecting bus bar 21A.

  In addition, a pair of engaging convex portions 33F and 34D (corresponding to engaging portions) are provided so as to project from the opposing walls along the connecting direction among the partition walls 33B and 34B in the connecting portion 33 and the connected portion 34, respectively. ing. Each engaging convex part 33F, 34D is allowed to move within the predetermined range of the connecting bus bar 21A by engaging with the engaged recessed part 23 of the connecting bus bar 21A. That is, as shown in FIG. 2, the groove width (width in the connection direction) a of the engaged recess 23 of the connecting bus bar 21A is slightly larger than the width dimension b in the connection direction of the engagement protrusions 33F and 34D. The difference a−b corresponds to a predetermined clearance, and the connecting bus bar 21 </ b> A is allowed to move up to a−b in the connection direction.

  The intermediate accommodating portion 35 accommodates the terminal holding portion 35A having a rectangular opening into which the main body portion 26A of the intermediate voltage detecting terminal 26 can be fitted from above, and the crimping portion 26B, and for voltage detection crimped thereto. The electric wire W2 is constituted by an electric wire passage groove 35B that can lead the electric wire W2 to the electric wire routing groove 36. A pair of fitting projections 37 each having a bar shape projecting rightward is provided at the right end of the four intermediate accommodating portions 35 formed side by side. Similarly, among the four intermediate accommodating portions 35, the leftmost intermediate accommodating portion 35C located on the leftmost side is fitted with the fitting convex portion 37 before and after sandwiching the terminal holding portion 35A. Are provided as a pair.

(Positioning part)
From among the four intermediate accommodating portions 35 arranged side by side, from the lower end of the second intermediate accommodating portion 35D located second from the right, as shown in FIG. 5, from which member the positioning portion 50 constitutes the battery wiring module 20 Is formed so as to protrude downward so as to be located closest to the unit cell 11 side. That is, the positioning part 50 is formed at a substantially central position of the units 31 and 40 in the direction intersecting with the arrangement direction of the cells 11. The positioning part 50 has a concave shape in which the electrode part 14 for voltage detection of the corresponding unit cell 11 can be inserted together with the electrode holding part 14A. In the present embodiment, the voltage detecting electrode portion 14 and the electrode holding portion 14A correspond to a positioned portion.

  When the positioning part 50 is viewed from the unit cell 11 side (lower side), as shown in FIG. 6, a front side wall part having a U-shape in plan view surrounding the front part of the electrode holding part 14A along the side part. 51, and a rear side wall portion 52 having a U-shape in a plan view surrounding the rear portion of the same electrode holding portion 14A along the side portion. As shown in FIGS. 7 to 10, tapered leading inclined surfaces 51A and 52A are formed along the periphery of the projecting ends of the front wall 51 and the rear wall 52, as shown in FIGS. Has been.

Next, a method for assembling the battery wiring module 20 will be described.
First, the accommodating bus bar 21 </ b> B is accommodated in the accommodating portion 32 of the first unit 31 and the second unit 40. Then, when connecting the first unit 31 and the second unit 40, one side of the connecting bus bar 21 </ b> A is laterally inserted and held in one of the connecting part 33 and the connected part 34 corresponding to each other, At the same time, the other side of the connecting bus bar 21A is laterally inserted in the connecting direction, and at the same time, the fitting convex portion 37 is inserted into the corresponding fitting concave portion 38, and the connected portion corresponding to the bottom plate 33A of the connecting portion. At the position where the bottom plates 34A of 34 are vertically overlapped, they are fitted to each other to complete the connecting operation.

  Regarding the voltage detection terminal 25, the flat plate portion is fitted into the terminal holding portion 32 </ b> D from above the bus bar 21 accommodated in the accommodation portion 32, and the voltage detection wire W <b> 1 crimped from the wire passage groove 32 </ b> E is connected to the wire routing groove 36. Derived to The intermediate voltage detection terminal 26 is inserted into the terminal holding portion 35A of the intermediate housing portion 35 with the flat plate portion 26A, and the voltage detection wire W2 crimped from the wire passage groove 35B is led out to the wire routing groove 36. .

  Thus, in the battery wiring module 20 to be assembled, the number of connections of the first unit 31 and the second unit 40 is determined according to the number of the single cells 11 constituting the single cell group. By the way, the groove width a of the engaged recess 23 of the connecting bus bar 21A that connects the units 31 and 40, and the connecting direction of the engaging protrusions 33F and 34D of the connecting portion 33 and the connected portion 34 that engage with the groove width a. Between the width dimension b, the clearance of ab is ensured. Therefore, as the battery wiring module 20, the number of the connecting bus bars 21A arranged in series in the connecting direction of the units 31 and 40 is 2 × (a The value obtained by multiplying -b) is maximized, and can be expanded and contracted in the connection direction. In addition, since the fitting convex part 37 is only inserted in the fitting recessed part 38, it fits with respect to the fitting recessed part 38 according to the positional relationship of each connection part 33 and the to-be-connected part 34 corresponding to it. It is determined how much the protrusion 37 is inserted in the connection direction.

Next, a method for assembling the battery wiring module 20 to the cell group will be described.
As shown in FIG. 7 and FIG. 9, the second intermediate accommodating portion 35 </ b> D provided for each unit 31, 40 is positioned so as to be located immediately above the corresponding voltage detecting electrode portion 14. Then, the positioning portion 50 projecting from the lower portion of the second intermediate housing portion 35D is placed on the electrode holding portion 14A around the electrode portion 14 and fitted. At this time, since the positioning part 50 protrudes downward on the unit cell 11 side from any part of the protector 30, it is easy to align with the reference electrode part 14.

  And the battery module 20 is assembled | attached on the basis of the positioning part 50 fitted to the electrode part 14 and electrode holding part 14A equivalent to a to-be-positioned part. That is, as described above, since the battery wiring module 20 can expand and contract in the connecting direction, the through hole 22 of the bus bar 21 and the insertion hole of the voltage detection terminal 25 communicating therewith, or the insertion hole 26C of the intermediate voltage detection terminal 26. And each position is adjusted so that the screw hole of each electrode part 12,13,14 may correspond (refer FIG.8 and FIG.10). In this manner, since the dimensional error between the electrode portions 12, 13, and 14 on the unit cell 11 side can be absorbed by the extendable configuration of the battery wiring module 20, the assembling work is facilitated.

  Subsequently, a shaft portion of a bolt (not shown) is inserted into each through hole 22 superimposed on each electrode portion 12, 13, 14, the insertion hole of the voltage detection terminal 25 communicating therewith, or the insertion hole 26 </ b> C of the intermediate voltage detection terminal 26. Then, the screw holes of the respective electrode portions 12, 13 and 14 are combined with the screw grooves of the bolts and bolted. Accordingly, the corresponding electrode portions 12 and 13 and the voltage detection terminal 25 are electrically connected through the bus bar 21, and the voltage detection electrode portion 14 and the intermediate voltage detection terminal 26 are electrically connected. Note that the through hole 22 of the bus bar 21, the insertion hole of the voltage detection terminal 25, and the insertion hole 26C of the intermediate voltage detection terminal 26 have an oval shape that is long in the left-right direction. In addition to absorbing dimensional errors between the electrode portions 12, 13, and 14, it is possible to provide a margin in the range in which the bolt can be inserted, and the bolt can be securely tightened. As described above, the assembly of the battery module 10 is completed by assembling the battery wiring module 20 into the unit cell group.

  As described above, according to the present embodiment, it is possible to improve the workability of attaching the battery wiring module 20 to the unit cell group. That is, the battery bar module 21 is collectively positioned with respect to the unit cell 11 by the voltage detecting electrode portion 14 and the surrounding electrode holding portion 14A corresponding to the positioning portion 50 and the positioned portion, and then the bus bar 21. And the electrodes 12 and 13 can be connected, so that it is not necessary to perform the troublesome work of aligning the electrode parts 12 and 13 with each bus bar 21. In particular, when the number of unit cells 11 constituting the unit cell group is large, the working efficiency can be remarkably improved. In addition, the protector 30 is provided with a positioning portion 50, and the positioning of the positioning portion 50 is previously fitted to the electrode portion 14 and the electrode holding portion 14 </ b> A around the electrode portion 14. Since the connection work is performed, it is not necessary to align the bus bar 21 and the electrode parts 12 and 13 with each other when the mounting work is performed, and these are damaged and the performance as the battery module 10 is deteriorated. The possibility of doing so can be reduced.

  Moreover, the electrode part 14 is made into the to-be-positioned part by setting it as the electrode part 14 for electrode detection provided in the same cell 11 as the electrode parts 12 and 13 which need alignment, and the electrode holding part 14A around it. And the assembly error of the bus bar 21 with respect to the electrode parts 12 and 13 after fitting the electrode holding part 14A and the positioning part 50 can be reduced, and deterioration of the mounting workability due to the increase in the assembly error. Can be prevented.

  In addition, since the positioning portion 50 is provided at a position protruding from the bus bar 21 to the unit cell 11 side, the battery wiring module 20 is attached to the unit cell 11 without being caught by the configuration of the unit cell 11 side. At this time, since the positioning portion 50 can be first fitted to the voltage detecting electrode portion 14 and the electrode holding portion 14A, the versatility is excellent.

  Moreover, since the positioning part 50 is formed in the approximate center position of the protector 30 in the direction intersecting with the arrangement direction of the single cells 11, for example, the protector for the single cells 11 is provided rather than provided at any end in the same direction. The assembly error of 30 can be reduced, and the alignment between the bus bar 21 and the electrode parts 12 and 13 can be made easier.

  Further, the positioned portion is a voltage detecting electrode portion 14 and an electrode holding portion 14A provided between the positive electrode portion 12 and the negative electrode portion 13 in the single cell 11, and the positioning portion 50 includes: Since it has a concave shape into which the voltage detecting electrode portion 14 and the electrode holding portion 14A can be inserted, the distance from the positioned portions 14 and 14A to the positive electrode portion 12 (13) and the positioned portions 14 and 14A Since the distance to the negative electrode portion 13 (12) can be made substantially the same distance, each bus bar 21 with respect to each electrode portion 12, 13 after the positioning portion 50 is fitted to the positioned portions 14, 14A. The assembly error can be suppressed in a well-balanced manner, and the mounting workability can be improved.

  Further, since the positioned portion is the voltage detecting electrode portion 14 and the surrounding electrode holding portion 14A, it is not necessary to provide a positioned portion separately from the voltage detecting electrode portion 14 on the unit cell 11 side. In addition to excellent versatility, cost reduction can be achieved. In addition, since the dimensional accuracy of the voltage detection electrode 14 and each of the electrode portions 12 and 13 is managed in the single battery 11 regardless of the positioning portion 50, a new (with voltage detection electrode 14 and Apart from that, there is no need to manage the dimensional accuracy of the positioned part. And if the positioning part 50 is fitted on the basis of the voltage detection electrode part 14 whose dimensional accuracy has already been managed, the assembly error of the bus bar 21 with respect to the electrode parts 12 and 13 becomes smaller, and the mounting workability Can be further improved.

  In addition, the projecting end of the positioning portion 50 is provided with guiding inclined surfaces 51A and 52A that are inclined so as to widen the inside thereof, so that the voltage detecting electrode portion 14 and the electrode holding portion 14A, which are positioning portions, are provided. When the positioning portion 50 is fitted to each other, it is possible to easily guide the electrode portion 14 and the electrode holding portion 14A by the leading inclined surfaces 51A and 52A. Therefore, by improving the workability of fitting the positioning portion 50 to the positioned portions 14 and 14A, it is possible to improve the mounting workability of the battery wiring module 20 as a whole.

  Even when an assembly error occurs between the plurality of single cells 11 and the battery wiring module 20 assembled thereto, at least one of the first unit 31 and the second unit 40 is connected to the bus bar 21 with respect to the bus bar 21. 21 is configured to be slidable in the connecting direction of 21, so that the relative position between the first unit 31 and the second unit 40 via the bus bar 21 is an electrode for voltage detection of the unit cell 11 that is on the other side. The portion 14 and the electrode holding portion 14A can be changed as a reference. Therefore, the assembly error with respect to the single battery 11 can be absorbed by the battery wiring module 20 side, and the trouble at the time of the assembly of the battery wiring module 20 resulting from both dimensional errors can be prevented.

  Further, the bus bar 21 is provided with an engaged recess 23, and at least one of the first unit 31 and the second unit 40 has a predetermined clearance ab in the connecting direction with respect to the engaged recess 23. Since the engaging protrusions 33F and 34D that can be engaged are provided, when the positioning portion 50 is fitted to the voltage detecting electrode portion 14 and the electrode holding portion 14A, which are positioning portions, a clearance is provided. Each bus bar 21 can be slid in the range ab. Accordingly, even if an error occurs in the dimension between the electrode portions 12 and 13, each bus bar 21 can be moved in the connection direction within the range of the clearance ab, so that the bus bar 21 with respect to the electrode portions 12 and 13 can be moved. Mounting workability can be improved.

<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-described embodiment, one positioning unit 50 is provided for each of the units 31 and 40. However, the present invention is not limited to this. For example, a positioning unit is provided for each single cell, and each positioning unit 50 corresponds to each unit. A positioning part may be provided in the unit. With such a configuration, positioning can be performed for each unit cell, so that an assembly error between the connection member and the electrode portion can be minimized. That is, the closer the formation position of the positioning portion is to the connection member that needs to be aligned, the smaller the assembly error of the connection member with respect to the electrode portion can be suppressed. Therefore, if a positioning part is provided for each unit cell of the minimum unit, it is possible to suppress assembly errors and improve assembly workability.

  (2) In the above-described embodiment, the positioning unit 50 is formed at a substantially central position of the protector 30 in the direction intersecting with the arrangement direction of the cells 11, but is not limited to this, and the end in the intersecting direction is not limited thereto. In the present invention, a positioning part is formed in the present invention.

  (3) In the above-described embodiment, the guiding inclined surfaces 51A and 52A are provided at the protruding end of the positioning portion 50. However, the present invention is not limited to this, and the guiding inclined surface may not be provided, A mark for aligning the positioning portion with respect to the portion may be formed. In addition to providing a positioning part and a positioned part, it is possible to further improve the assembling workability of the battery wiring module with respect to the single cell by giving a device that facilitates fitting the positioning part to the positioned part. it can.

  (4) In the above-described embodiment, the engaging convex portions 33F and 34D that engage with the engaged concave portion 23 are provided in both the first unit 31 and the second unit 40. You may make it provide a joint part in any one of a 1st unit and a 2nd unit. Even if it does in this way, the malfunction at the time of battery wiring module attachment can be prevented by the clearance of the engaging part provided in at least one unit, and the to-be-engaged part provided in a connection member.

  (5) In the above-described embodiment, the engaged concave portion 23 and the engaging convex portions 33F and 34D are provided. However, the present invention is not limited to this. For example, the engaged portion and the engaging portion are not provided, and the connection member is connected to each unit. However, it may be configured to be slidable (regardless of the clearance).

  (6) In the above-described embodiment, the electrode parts 12, 13, and 14 of the unit cell 11 are nut-shaped and fastened by using bolts of separate members. It is good also as a structure which has a rod-shaped axial part which has a thread groove, and fixes a connection member to a terminal part by fastening the nut of another member. In this case, the shaft portion of the electrode portion is passed through the through hole of each connection member.

  (7) In the above-described embodiment, the case where the plurality of unit cells 11 are connected in series has been described. However, the present invention is not limited to this, and the case where a plurality of unit cells are connected in parallel may be applied.

  (8) In the above-described embodiment, the number of single cells 11 constituting the battery module 10 is not limited to the number in the above-described embodiment. Further, the shape of the battery wiring module 20 can be arbitrarily set according to the number of the cells 11.

  (9) In the above-described embodiment, the bus bar 21 is exemplified as the connection member. However, the bus bar 21 is not limited to this, and any member that can be electrically connected may be used. For example, an electric wire, a flexible printed circuit board (FPC), or the like is used. Also good.

DESCRIPTION OF SYMBOLS 10 ... Battery wiring module 11 ... Single cell 12, 13 ... Electrode part 12A, 13A, 14A ... Electrode holding part 14 ... Electrode part for voltage detection (positioned part)
20 ... Battery wiring module 21 ... Bus bar (connection member)
21A ... Bus bar for connection 21B ... Bus bar for accommodation 22 ... Through hole 23 ... Recessed portion (engaged portion)
25 ... Voltage detection terminal 26 ... Intermediate voltage detection terminal 30 ... Protector 31 ... 1st unit 33F, 34D ... Engagement convex part (engagement part)
37 ... fitting convex part 38 ... fitting concave part 40 ... second unit 50 ... positioning parts 51A, 52A ... guiding slope

Claims (8)

A battery wiring module attached to a unit cell group in which a plurality of unit cells having positive and negative electrode portions are arranged,
A connection member for connecting the electrode parts, and a protector for holding the connection member,
The protector is formed with a positioning portion that fits into a positioned portion formed in the unit cell before the connection member reaches a connection position with the electrode unit when attached to the unit cell. The positioning portion is provided at a position protruding to the unit cell side than the connection member ,
The battery positioning module , wherein the positioned part is an electrode part for voltage detection provided in one unit cell.   2. The battery wiring module according to claim 1, wherein the positioning portion is positioned closest to the unit cell when attached to the unit cell.   3. The battery wiring module according to claim 1, wherein the positioning portion is formed at a substantially central position of the protector in a direction intersecting with an arrangement direction of the single cells.   4. The battery wiring module according to claim 1, wherein the positioning portion is provided in the protector corresponding to each of the single cells. 5. The portion to be positioned is provided between the electrode portion of the positive electrode and the negative electrode in the one of the unit cells,
5. The battery wiring module according to claim 1, wherein the positioning portion has a concave shape into which the positioned portion can be inserted.   The battery wiring module according to claim 5, wherein a guiding inclined surface that inclines so as to expand the inner side is provided at a protruding end of the positioning portion. The connection member includes a connection member for connection, and the connection member for connection connects the electrode portions adjacent to each other of the plurality of unit cells,
The protector consists of a first unit that holds one side in the connection direction of the connecting member for connection, and a second unit that holds the other side in the connection direction of the connecting member for connection,
7. At least one of the first unit and the second unit is slidable in the connecting direction of the connecting member with respect to the connecting member. The battery wiring module according to any one of the above.   The coupling connecting member is provided with an engaged portion, and at least one of the first unit and the second unit has a predetermined clearance in the connecting direction with respect to the engaged portion. The battery wiring module according to claim 7, further comprising an engaging portion that can be engaged.

Images