JP2015049931A - Battery wiring module of battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve attaching workability of a battery wiring module to a battery module and durability of the battery wiring module in the battery wiring module which is attached to the battery module configured by superposing battery cells to connect the battery cells in series.SOLUTION: A battery wiring module 11 configured by holding bus bars 12 to be respectively connected to electrode posts 73 of battery cells 71 on a wiring base 15 includes: a trunk part 51 extended in a superposing direction of the battery cells 71 on the wiring base 15; a plurality of branch parts 52 extended from both side faces of the trunk part 51; and a plurality of bus bar holding parts 53 respectively formed on tips of the branch parts 52 to individually hold the bus bars 12. A displacement allowable space 54 for non-connecting the adjacent bus bar holding parts 53 and allowing displacement is formed between the adjacent bus bar holding parts 53 to provide at least the branch parts 52 with flexibility. The trunk part 51 is provided with a wire guide part 55 for guiding voltage monitoring wires 13 each connecting its one end to the bus bar 12 to hold the voltage monitoring wires 13.

Description

  TECHNICAL FIELD The present invention relates to an in-battery wiring module in which a plurality of battery cells are stacked and attached to a battery module, and the battery cells are connected in series. It relates to the wiring module.

  A battery pack as a high output power source mounted in an electric vehicle, a hybrid vehicle, or the like includes one or more battery modules. The battery module is configured by overlapping a plurality of battery cells connected in series.

  To connect battery cells in series, the positive and negative electrodes of adjacent battery cells are connected, but the pitch between the battery cell electrodes in the battery module is not necessarily the same. In other words, since the dimensional tolerance of the battery cells to be overlapped and the separator provided between them overlaps with the misalignment tolerance of the electrode of the battery cell, the electrode positional deviation becomes closer to the both end sides in the battery module overlapping direction. May grow. For this reason, there existed a problem that the operation | work which connects in series was not easy.

  In order to solve this problem, a battery connection plate disclosed in Patent Document 1 below has been proposed.

  The battery connection plate of Patent Document 1 has a configuration in which an integral pitch adjusting means that is displaced in order to absorb misalignment between the electrodes is provided between connection portions that include bus bars that connect the electrodes. With this configuration, even if there is a difference in the pitch between the electrodes of the battery cells in the battery module, the pitch adjusting means appropriately adjusts the distance between the connection portions so that the bus bars provided at the connection portions are adjusted to the electrodes. Since it can be made to correspond, connection workability is good.

  However, since the pitch adjusting means has a configuration in which the connecting portions are directly connected to each other, the allowable displacement amount is not so large. For this reason, when the difference in pitch between the electrodes is large, the pitch adjusting means may not be able to absorb the difference in pitch and may be damaged.

  In addition, in adjacent connection parts, the displacement of one connection part affects the other connection part via the pitch adjusting means, and an unnecessary displacement is forced on the other connection part. There is also a drawback that distortion occurs in the plate and the bus bar provided at the connection portion thereof. Distortion leads to weakening of the battery connection plate.

JP 2000-149909 A

  In view of the above, the main object of the present invention is to ensure that the battery module has excellent attachment properties and that the in-battery wiring module and the related device are not easily damaged and have excellent durability.

  The first means for that purpose is to attach a plurality of battery cells to each other so that positive and negative electrodes are alternately arranged on both sides, and connect the plurality of battery cells in series. A wiring module in a battery in which a plurality of bus bars that connect positive and negative electrodes of battery cells adjacent in the stacking direction of the battery cells are held on a wiring base material, wherein the wiring base material is the battery A trunk extending in the cell overlapping direction, a plurality of branches extending from the side of the trunk in a direction intersecting with the battery cell overlapping direction, and formed at the tips of these branches, individually holding the bus bars Provided with a plurality of bus bar holding portions, and between the bus bar holding portions, adjacent bus bar holding portions are not connected to each other, and a displacement allowable space for allowing displacement is provided. In addition, the branch portion has flexibility, a wiring guide portion for guiding a voltage monitoring line having one end connected to the bus bar to the trunk portion, and an in-battery wiring including the voltage monitoring line led to the wiring guide portion. It is a module.

  The term “overlapping” is used to include the overlapping in the horizontal direction as well as the vertical direction.

  The wiring guide part may be one that simply puts the voltage monitoring line, or may be provided with means for positively holding the wire monitoring line.

  In this configuration, the plurality of bus bar holding portions holding the bus bars are formed at the ends of the branch portions extending from the side portions of the trunk portion, and at least the branch portions are flexible. The bus bar holding part is tilted or bent to be displaced according to the electrode of the battery cell to absorb the pitch difference between the electrodes. If the branch portion is bent or curved, it is possible to cope with a case where the surface to which the trunk portion of the in-battery wiring module is attached and the surface having the electrodes are different.

  The displacement-permissible space between the plurality of bus bar holding portions makes the displacement of the above-described bus bar holding portion more flexible, and allows adjacent bus bar holding portions to be freely displaced from each other, thereby blocking strain transmission. Since the displacement of the bus bar holding portion is made flexible, damage to the bus bar holding portion can be prevented and transmission of strain can be suppressed, so that the wiring substrate can be prevented from becoming weak, and as a result, durability can be improved.

  In addition to supporting the branch part, the trunk part guides the voltage monitoring line connected to the bus bar of the bus bar holding part to the wiring guide part, and holds the voltage monitoring line in an orderly manner. As a result, the voltage monitoring line can be protected, and unexpected damage or the like can be prevented. Since the voltage monitoring line is connected to the bus bar and held by the trunk, the voltage monitoring line can be easily attached.

As an aspect of the present invention, a wiring guide portion that guides the voltage monitoring line may be provided in the branch portion.
In this configuration, since the branch wiring guide portion guides the portion of the voltage monitoring line between the bus bar holding portion and the trunk portion and holds it in an orderly manner, more complete protection of the voltage monitoring line can be achieved.

As an aspect of the present invention, a voltage monitoring unit main body that connects the voltage monitoring line may be mounted on the trunk.
In this configuration, since the trunk has a voltage monitoring unit main body for connecting the voltage monitoring line, when attaching to the battery module, it is possible to attach the voltage monitoring unit main body only by attaching the in-battery wiring module. . That is, the mounting workability is significantly improved.

As an aspect of the present invention, the bus bar holding portion may be provided with holding means for holding the bus bar in a detachable manner.
In this configuration, the holding means holds the bus bar and allows the bus bar to be removed during recycling. For this reason, workability at the time of recycling is good.

As an aspect of the present invention, the branch portion may be provided on both side portions of the trunk portion. In this case, the formation position of the branch part is shifted in the longitudinal direction of the trunk part between the one side part and the other side part.
In this configuration, the branch portions on both side surfaces of the trunk portion enable connection to the electrodes on both sides of the battery cell, so that the battery cells can be connected in series by attaching one in-battery wiring module.

  A second means for solving the problem is attached to a battery module configured by stacking a plurality of battery cells so that positive electrodes and negative electrodes are alternately arranged on both sides, and the plurality of battery cells are connected in series. A wiring base that holds a plurality of bus bars that connect the positive and negative electrodes of the battery cells adjacent to each other in the stacking direction of the battery cells in order to connect, and extends in the stacking direction of the battery cells And a plurality of branch portions extending from the side of the trunk portion in a direction crossing the overlapping direction of the battery cells, and a plurality of bus bar holding portions formed at the tips of the branch portions and individually holding the bus bars. In addition, between the bus bar holding portions, adjacent bus bar holding portions are not connected to each other and a displacement allowable space for allowing displacement is provided, and at least the branch portion has flexibility. Moni, the executive, a wiring substrate having a wiring guide portion for guiding the voltage monitoring line having one end connected to the bus bar.

A third means for solving the problem is a battery module to which the in-battery wiring module is attached.
In this configuration, the displacement of the bus bar holding part of the in-battery wiring module can be flexibly matched to the electrode of the battery cell, so that the bus bar holding part can be prevented from being damaged, and the strain is transmitted by deformation of the branch part that displaces the bus bar holding part. Therefore, the wiring substrate itself can be prevented from being weakened. The voltage monitoring line can also be protected. As a result, it is possible to improve the durability of the battery module to which the in-battery wiring module is attached. In addition, since the voltage monitoring line is connected to the bus bar and held by the trunk, the assemblability of the battery module to which the in-battery wiring module is attached can be improved.

The 4th means for solving a subject is a battery pack in which the battery module which attached the above-mentioned wiring module in a battery was stored.
In this configuration, the displacement of the bus bar holding part of the in-battery wiring module can be flexibly matched to the electrode of the battery cell, so that the bus bar holding part can be prevented from being damaged, and the strain is transmitted by deformation of the branch part that displaces the bus bar holding part. Therefore, the wiring substrate itself can be prevented from being weakened. The voltage monitoring line can also be protected. As a result, it is possible to improve the durability of the battery module to which the in-battery wiring module is attached. As a result, it is possible to improve the durability of the battery pack containing the battery module. In addition, since the voltage monitoring line is connected to the bus bar and held by the trunk, the assemblability of the battery pack that accommodates the battery module to which the in-battery wiring module is attached can be improved.

  According to the present invention, the battery wiring module is easily attached to the battery module, and the battery wiring module, the wiring substrate used therefor, the battery module having the battery wiring module attached thereto, and the durability of the battery pack are provided. Can be improved.

The perspective view of a wiring module in a battery. The perspective view of the battery module which attached the wiring module in a battery. The perspective view of the battery pack which accommodated the battery module. The disassembled perspective view of the wiring module in a battery. The expansion perspective view of a bus bar and a bus-bar holding part. The disassembled perspective view which shows the state which attaches the wiring module in a battery with respect to a battery module. The top view which shows the action state of the wiring module in a battery, and a wiring base material. The perspective view of the wiring module in a battery which concerns on another example. The perspective view of the wiring module in a battery which concerns on another example. The perspective view of the wiring module in a battery which concerns on another example. The perspective view of the wiring module in a battery which concerns on another example. The perspective view of the wiring module in a battery which concerns on another example. The top view of the branch part which concerns on another example.

An embodiment for carrying out the present invention will be described below with reference to the drawings.
1 is a perspective view of an in-battery wiring module 11, FIG. 2 is a perspective view of a battery module 72 to which the in-battery wiring module 11 is attached, and FIG. 3 is a perspective view of a battery pack 75 that houses the battery module 72. It is. 4 is an exploded perspective view of the in-battery wiring module 11, FIG. 5 is an enlarged perspective view of the bus bar 12 and the bus bar holding portion 53, and FIG. 6 is a perspective view of a state before the in-battery wiring module 11 is attached to the battery module 72. FIG. FIG. 7 is a plan view showing the operating state of the in-battery wiring module 11 and the wiring base material 15. 8 to 13 are drawings for explaining other examples.

  The in-battery wiring module 11 shown in FIG. 1 is attached to a battery module 72 configured by stacking a plurality of battery cells 71 as shown in FIG. 2, in order to connect the battery cells 71 in series. The bus bar 12 connected to the electrode post 73 as the electrode of the battery cell 71, the voltage monitoring line 13 connected to the bus bar 12 at one end, and the voltage monitoring unit main body 14 connected to the other end of the voltage monitoring line 13 are wired. This is a configuration provided in the base material 15. The voltage monitoring line 13 and the voltage monitoring unit main body 14 are for monitoring the voltage of the battery cell 71 in order to prevent overcharge and overdischarge of the battery cell 71 constituting the battery module 72.

  The in-battery wiring module 11 is attached to the battery module 72, and the battery module 72 to which the in-battery wiring module 11 is attached constitutes a battery pack 75 housed in the battery housing box 74 as shown in FIG. The number of battery modules 72 accommodated in the battery pack 75 is not limited to the illustrated example and is one or more. When the number of battery modules 72 is two or more, although not shown, the electric modules 72 are connected in series with each other.

  First, the battery cell 71 and the battery module 72 will be briefly described.

  As shown in FIG. 2, the battery cell 71 has a thin hexahedron shape having two rectangular vertical surfaces 71 a, and the electrode posts on the left and right sides of the upper surface 71 b when the vertical surface is set up. In this configuration, a positive electrode post 73a and a negative electrode post 73b as 73 are disposed. The positive electrode post 73 a and the negative electrode post 73 b are formed in a rod shape and protrude from the upper surface 71 b of the battery cell 71. The outer peripheral surfaces of the positive electrode post 73a and the negative electrode post 73b have male screws (not shown) on the outer peripheral surface that allow the nut 16 (see FIG. 2) to be screwed together.

  The overlapping of the battery cells 71 for constituting the battery module 72 is performed so that the vertical surfaces 71a of the battery cells 71 face each other. That is, the electrode posts 73 of the battery cells 71 are arranged in the overlapping direction of the battery cells 71 on both sides.

  At this time, the battery cells 71 are alternately oriented so that the electrode posts 73 adjacent in the overlapping direction of the battery cells 71 in the adjacent battery cells 71 are alternately arranged with the positive electrode posts 73a, the negative electrode posts 73b, and the positive electrode posts 73a. Overlapping while changing. A separator for securing a cooling passage is interposed between the battery cells 71, but the illustration of the separator is omitted for convenience.

  Next, the in-battery wiring module 11 will be described.

  As shown in FIG. 4, the in-battery wiring module 11 includes the wiring base material 15, the bus bar 12, the voltage monitoring line 13, and the voltage monitoring unit main body 14.

  The wiring substrate 15 is entirely formed of a relatively soft synthetic resin having insulation and flexibility. Describing the general configuration, the wiring substrate 15 includes an elongated trunk 51 extending in the overlapping direction (see FIG. 2) of the battery cells 71 of the battery module 72, and the battery cells 71 overlapping from both sides of the trunk 51. A plurality of branch portions 52 extending horizontally in a direction intersecting the alignment direction, specifically, a direction orthogonal to each other, and a plurality of bus bar holding portions 53 formed individually at the ends of the branch portions 52 and individually holding the bus bars 12 are integrally formed. And a displacement-permissible space 54 is provided between the bus bar holding portions 53.

  The trunk portion 51 has a plate-like substrate 51a in a plan view and a dish-like shape in which a wall portion 51b is erected on almost the entire circumference except for one end in the longitudinal direction of the substrate 51a. A substantially entire inner side of the trunk 51 surrounded by the substrate 51a and the wall 51b is a wiring guide 55 for guiding the voltage monitoring line. The length of the trunk 51 is appropriately set according to the length of the battery module 72.

  In addition, a voltage monitoring unit main body mounting portion 56 on which the wire monitoring unit main body 14 is mounted is formed on a portion of the trunk portion 51 on one end side that does not have the wall portion 51b. The voltage monitoring unit main body attaching portion 56 is appropriately formed in a shape that can be locked or screwed, for example, according to the mounting mode of the voltage monitoring unit main body 14.

  A plurality of the branch parts 52 are formed in parallel from both side parts of the trunk part 51 at a predetermined interval. The cross-sectional shape of the branch portion 52 is a size that can accommodate the voltage monitoring line 13, and has a narrow substrate 52a and wall portions 52b provided on both sides of the substrate 52a (see FIG. 5). The wall part 52 b of the branch part 52 is connected to the wall part 51 b of the trunk part 51. The entire inside of the branch part 52 surrounded by the substrate 52a and the wall part 52b is a wiring guide part 55 for guiding the voltage monitoring line. In addition, the said branch part 52 is not restricted to the illustrated example, It sets according to the number of the battery cells 71 of the battery module 72 to apply.

  The bus bar holding portion 53 has a rectangular shape in plan view, and has a rectangular frame-shaped frame portion 53a constituting the bottom, and a wall portion 53b erected on the entire outer peripheral edge of the frame portion 53a. The wall part 53 b of the bus bar holding part 53 is connected to the wall part 52 b of the branch part 52.

  The bus bar 12 held by the bus bar holding portion 53 is a member for electrical conduction. In this example, as shown in FIG. 4, the bus bar 12 is shown from a single plate having conductivity. In order to connect to the electrode post 73 having the above-described shape, the bus bar 12 has a through hole 21 through which the electrode post 73 passes. Since the adjacent electrode posts 73 in the adjacent battery cells 71 of the battery module 72 are alternately arranged with the positive electrode posts 73a and the negative electrode posts 73b as described above, the bus bar 12 has one of the two side portions of the trunk portion 51 on one side. Except for some bus bars 12a at positions corresponding to both ends of the battery cell 71 in the overlapping direction, one through hole 21 connected to the positive electrode post 73a and one through hole 21 connected to the negative electrode post 73b are provided. (See FIG. 2). The interval between the through holes 21 corresponds to the interval between the electrode posts 73 of the adjacent battery cells 71.

  The bus bar 12a at a position corresponding to both ends of the battery cells 71 in the overlapping direction on one side of the both sides of the trunk 51 has a structure including one through hole 21 at the center.

  In order to arrange all the through holes 21 in the plurality of bus bars 12 at a constant interval corresponding to the dimension setting of the battery cell 71 and the electrode post 73, the position, length, and the like are appropriately set. Thus, the bus bar holding portion 53 and the branch portion 52 are formed. The formation position of the branch part 52 with respect to the bus bar holding part 53 is an intermediate position in the overlapping direction of the battery cells 71 in the bus bar holding part 53.

  If it adds about the branch part 52 formed in the both sides of the trunk part 51, the branch position 52 of the one side part and the branch part 52 of the other side part have shifted | deviated in the longitudinal direction of the trunk part 51. FIG. Specifically, with the exception of the bus bar holding portion 53 that holds the bus bar 12a having one through hole 21, the branch portion 52 on the other side is positioned at an intermediate position between two adjacent branch portions 52 on one side. Exists.

  Further, the bus bar holding portion 53 is provided with holding means for holding the bus bar 12 in a detachable manner as shown in FIG. The holding means includes a plurality of locking projections 53c having a triangular cross section formed above the upper surface of the frame portion 53a on the inner surface of the wall portion 53b of the bus bar holding portion 53. The locking projection 53c can be displaced by the flexibility and softness of the material constituting the bus bar holding portion 53. A hole for facilitating deformation may be provided around the locking protrusion 53c. Moreover, you may employ | adopt structures other than the latching protrusion 53c of the shape as mentioned above for a holding means.

  The displacement allowance space 54 is a portion that allows the adjacent bus bar holding portions 53 to be disconnected from each other and allows the bus bar holding portion 53 to be displaced based on displacement such as inclination or bending of the branch portion 52.

  As shown in FIG. 4, the wiring board 15 configured as described above includes a bus bar 12 to which one end of the voltage monitoring line 13 is connected and a voltage monitoring unit main body 14 to which the other end of the voltage monitoring line 13 is connected. 1, the voltage monitoring line 13 is guided to the branch part 52 and the wiring guide part 55 of the trunk part 51. Then, the in-battery wiring module 11 is obtained.

  The voltage monitoring line 13 is connected to the bus bar 12 by welding the terminal of the voltage monitoring line 13, for example, resistance welding, fiber laser welding, ultrasonic welding, or the like. In FIG. 4, 22 is a welding part. In addition, a configuration may be adopted in which the crimping portion is crimped and connected after the end of the voltage monitoring line 13 is inserted into a crimping portion (not shown) formed in a part of the bus bar 12. It may be connected via a round terminal (not shown) having a through hole inserted into the electrode post. However, if it is previously connected by welding or crimping as described above, the round terminal is connected to the electrode post. The voltage monitoring line 13 can be wired only by the work of holding the bus bar 12 to the bus bar holding portion 53, so that the number of parts can be reduced and the assembling work can be simplified. Has the advantage of being able to.

  The other end of the voltage monitoring line 13 is connected to a wire connecting portion 41 provided on the end face of the voltage monitoring unit main body 14 (see FIGS. 1 and 4). The electric wire connecting portion 41 is a press contact terminal and can be connected by press-fitting the other end of the voltage monitoring line 13 from above.

  The electric wire monitoring unit main body 14 has a box shape with a low height, and has a connector connecting portion 42 on an end surface different from the end surface having the electric wire connecting portion 41. A connector 43 for wiring is connected to the connector connecting portion 42 as shown in FIG. The battery state information of the battery module 72 is connected to an external electronic control unit (not shown) through the connector 43.

  The in-battery wiring module 11 configured as described above is attached to the surface of the battery module 72 having the electrode posts 73 as shown in FIG. The attachment is performed by screwing the nut 16 into the electrode post 73 after inserting the through hole 21 of the bus bar 12 into the electrode post 73 of the battery module 72. After the attachment, the cover member 18 is attached on the in-battery wiring module 11. The cover member 18 is appropriately formed according to the shape of the in-battery wiring module 11.

  Since the bus bar holding portion 53 for holding the bus bar 12 is supported only by the flexible branch portion 52 and the bus bar holding portions 53 are not connected to each other, the through hole 21 of the bus bar 12 is inserted into the electrode post 73. When fitting, as shown in FIG. 7, even if there is a shift in the position of the electrode post 73 to which the bus bar 12 of the adjacent bus bar holding portion 53 is connected, the electrode post 73 is displaced corresponding to the shift. That is, the displacement of the electrode post 73 is absorbed by the displacement of the branch portion 52. For this reason, the in-battery wiring module 11 can be easily and reliably attached to the battery module 72 without applying an excessive force.

  In FIG. 7, the voltage monitoring line 13 and the voltage monitoring unit main body 14 are not shown for convenience.

  In addition, since the bus bar holding portions 53 are not connected to each other and have a displacement allowable space 54 between the bus bar holding portions 53, even if some of the bus bar holding portions 53 are displaced, distortion due to the displacement is caused by other bus bar holding portions. Transmission to 53 can be avoided.

  Since it is not necessary to apply an unreasonable load for attachment and the occurrence of distortion can be suppressed, damage and weakening of the wiring substrate 15 can be prevented, and durability can be enhanced. Since the durability of the wiring substrate 15 is increased, the durability of the in-battery wiring module 11, the battery module 72 to which the wiring module 11 is attached, and the battery pack 75 that accommodates the electric module 72 can also be improved.

  In addition, since the branch portions 52 of the wiring base material 15 are provided on both sides of the trunk portion 51, if one in-battery wiring module 11 is attached, the battery cells 71 in one battery module 72 can be connected in series. it can. For this reason, workability | operativity is good compared with the case where another member is separately attached with respect to the both sides of the battery module 72. FIG. In addition, the wiring base material 15 does not have to be provided one by one with different shapes, so that the entire work from manufacturing to management, assembly work, and mounting work can be simplified.

  In addition, since the in-battery wiring module 11 is integrally provided with members necessary for voltage monitoring in addition to the bus bar 12 necessary for the series connection of the battery cells 71, the battery module 72 to which the in-battery wiring module 11 is attached. In addition, the assembly work of the battery pack 75 can be simplified.

  Since the trunk portion 51 and the branch portion 52 of the wiring base material 15 in the in-battery wiring module 11 have the wiring guide portion 55 that guides the voltage monitoring line 13, the voltage monitoring lines 13 can be organized neatly. For this reason, wiring and its connection part can be protected and handling property is favorable.

  Since the bus bar 12 can be attached to and detached from the bus bar holding part 53, the bus bar 12 can be removed from the bus bar holding part 53 at the time of recycling, and separation can be easily performed.

  Hereinafter, other examples will be described. In this description, parts that are the same as or equivalent to those in the above configuration are given the same reference numerals, and detailed descriptions thereof are omitted.

  FIG. 8 is a perspective view of the in-battery wiring module 11, and is an example in which a connector 44 for connecting the voltage monitoring unit main body 14 is mounted on the trunk 51 of the wiring base 15 as shown in FIG. One end of the required number of voltage monitoring lines 13 is connected to the connector 44.

  According to this configuration, since the connection between the voltage monitoring unit main body 14 and the voltage monitoring line 13 is made via the connector 44, the connection work of the voltage monitoring line 13 on the wiring substrate 15 is omitted, and the assembly work is simplified. Can be achieved.

  FIG. 9 is a perspective view showing the in-battery wiring module 11 that can be attached to the battery module 72 having the gas discharge duct 72a on the upper surface from which the electrode post 73 protrudes.

  This in-battery wiring module 11 has a structure in which the branch portions 52 on both sides of the trunk portion 51 are directed obliquely downward, and the bottom surface of the substrate 51a of the trunk portion 51 is floated above the height of the gas discharge duct 72a. The shape of the branch portion 52 may be a bent shape instead of a linear shape.

  According to this configuration, the bus bar 12 can be properly connected to the electrode post 73 by tightening the nut 16 even for the battery module 72 having the gas discharge duct 72a.

  FIG. 10 is also a perspective view showing the in-battery wiring module 11 that can be attached to the battery module 72 having the gas discharge duct 72a on the upper surface from which the electrode post 73 protrudes.

  The in-battery wiring module 11 has a configuration in which the in-battery wiring module 11 having the above-described configuration is divided into two on the left and right in the trunk portion 51. That is, in the structure provided with the several branch part 52 extended toward the outer side (electrode post 73 direction) of the width direction of the battery module 72 in one side surface of the trunk 51 which can be attached along the side surface of the gas exhaust duct 72a. is there. Only the wiring guide portion 55 is formed on the trunk portion 51.

  An end portion of the voltage monitoring line 13 led to the wiring guide portion 55 is connected to the connector 44 outside the trunk portion 51. The connector 44 and the voltage monitoring unit main body 14 (see FIG. 8) connected to the connector 44 are attached to appropriate positions of the battery module 72.

  Each connector 44 of the in-battery wiring module 11 divided into the left and right parts may be integrated instead of separately on the left and right.

  According to this configuration, it is possible to attach the in-battery wiring module 11 while avoiding the gas discharge duct 72a, and to form a compact shape that is not bulky.

  FIG. 11 is a perspective view showing a modified example of the in-battery wiring module 11 shown in FIG. 10 and is connected even if the trunk 51 is arranged at a position outside in the width direction from the gas discharge duct 72a (see FIG. 10). It is a configuration that can be made. That is, a plurality of branch portions 52 extending toward the inner side in the width direction of the battery module 72 (in the direction of the gas discharge duct 72a) are provided on one side surface of the trunk portion 51 that can be attached at a position away from the side surface of the gas discharge duct 72a. It is a configuration. Only the wiring guide portion 55 is formed on the trunk portion 51.

  Even in this configuration, the in-battery wiring module 11 can be attached while avoiding the gas discharge duct 72a, and the shape can be made compact without being bulky. Further, according to this configuration, the in-battery wiring module 11 can be attached even when the electrode post 73 (see FIG. 9) protrudes not in the left and right sides of the upper surface 71b of the battery cell 71 but in the vicinity of the center.

  FIG. 12 is a perspective view of the in-battery wiring module 11 that is attached to the upper surface of the battery module 72 and can be connected even when the electrode post 73 protrudes from the side surface 71c instead of the upper surface 71b of the battery cell 71.

  That is, in the in-battery wiring module 11, the branch portion 52 of the wiring base material 15 is formed longer than the case described above, and a notch for facilitating the bending of the branch portion 52 in the middle of the branch portion 52 in the longitudinal direction. A portion 52c is provided. When the flexibility is high, the notch 52c may not be provided.

  In the in-battery wiring module 11 configured as described above, if the in-battery wiring module 11 is mounted so as to be placed on the upper surface of the battery module 72, it can be mounted even when the electrode post 73 is provided on the side surface 71c. Workability is good because series connection is possible with a single installation.

  FIG. 13 is a plan view showing another example of the branch part 52, and the branch part 52 has an expansion / contraction mechanism 52d that expands and contracts in the longitudinal direction. In this example, the expansion / contraction mechanism is shown as an example of a fitting structure that fits each other and can slide between each other.

  When the branch part 52 has such an expansion / contraction mechanism 52d, even if there is a case where the pitch difference of the electrode post 73 is large and the branch part 52 is tilted or curved and cannot be accommodated, the expansion / contraction mechanism 52d. Therefore, the electrode post 73 can be made to respond more flexibly.

In correspondence between the configuration of the present invention and the configuration of the above-described embodiment,
The electrode of the present invention corresponds to the electrode post 73, the positive electrode post 73a, the negative electrode post 73b,
Similarly,
The holding means corresponds to the locking projection 53c,
The present invention is not limited to the configuration of the above-described one form, and other configurations can be adopted.

  For example, the trunk 51 and the branch 52 may be formed in a plate shape without the walls 51a and 52a. In this case, the voltage monitoring line 13 is appropriately held in the wiring guide 55 appropriately. It is good to provide the means.

  Further, the branch portions 52 as described above can be provided not only in all the bus bar holding portions 53 but in only some bus bar holding portions 53.

  In the above-described example, the electrode post 73 is shown as the electrode. However, other types of electrodes may be used, and the way of connecting the bus bar 12 is not limited to the fixing by the nut 16.

DESCRIPTION OF SYMBOLS 11 ... Wiring module in a battery 12 ... Bus bar 13 ... Voltage monitoring line 14 ... Voltage monitoring unit main body 15 ... Wiring base material 51 ... Trunk part 52 ... Branch part 53 ... Bus-bar holding part 53c ... Locking protrusion 54 ... Displacement allowable space 55 ... Wiring Guide portion 71 ... Battery cell 72 ... Battery module 73 ... Electrode post 73a ... Positive electrode post 73b ... Negative electrode post 75 ... Battery pack

Claims (8)

It is attached to a battery module configured by stacking a plurality of battery cells so that positive electrodes and negative electrodes are alternately arranged on both sides, and in order to connect the plurality of battery cells in series, A wiring module in a battery in which a plurality of bus bars that connect positive and negative electrodes between adjacent battery cells are held on a wiring substrate,
The wiring substrate is a trunk extending in the overlapping direction of the battery cells;
A plurality of branches extending in a direction intersecting with the overlapping direction of the battery cells from the side of the trunk,
A plurality of bus bar holding portions that are formed at the ends of these branch portions and hold the bus bars individually,
Between these bus bar holding parts, adjacent bus bar holding parts are disconnected and provided with a displacement allowable space that allows displacement,
At least the branch has flexibility,
An in-battery wiring module comprising: a wiring guide section for guiding a voltage monitoring line having one end connected to the bus bar; and the voltage monitoring line guided to the wiring guide section. The in-battery wiring module according to claim 1, further comprising: a wiring guide part that guides the voltage monitoring line to the branch part. The in-battery wiring module according to claim 1 or 2, wherein a voltage monitoring unit main body for connecting the voltage monitoring line is mounted on the trunk. The in-battery wiring module according to any one of claims 1 to 3, wherein the bus bar holding portion includes holding means for detachably holding the bus bar. The in-battery wiring module according to any one of claims 1 to 4, wherein the branch portion is provided on both side portions of the trunk portion. It is attached to a battery module configured by stacking a plurality of battery cells so that positive electrodes and negative electrodes are alternately arranged on both sides, and in order to connect the plurality of battery cells in series, A wiring substrate that holds a plurality of bus bars that connect the positive electrode and the negative electrode between adjacent battery cells,
A trunk extending in the overlapping direction of the battery cells;
A plurality of branches extending in a direction intersecting with the overlapping direction of the battery cells from the side of the trunk,
A plurality of bus bar holding portions that are formed at the ends of these branch portions and hold the bus bars individually,
Between these bus bar holding parts, adjacent bus bar holding parts are disconnected and provided with a displacement allowable space that allows displacement,
At least the branch has flexibility,
The wiring base material provided with the wiring guide part which the said trunk | drum guides the voltage monitoring line which connected the end to the said bus bar.   The battery module which attached the wiring module in a battery as described in any one of Claims 1-5.   A battery pack containing a battery module to which the in-battery wiring module according to any one of claims 1 to 5 is attached.

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