JP2014093163A - Wire routing structure of bus bar module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain downsizing of a bus bar module and simplification in structure and to reduce a routing length of a lead wire.SOLUTION: In a wire routing structure of a bus bar module 13, in a resin bus bar accommodation part 41 for accommodating a bus bar 25 which connects electrodes of neighboring batteries in a battery assembly 11 formed from a plurality of batteries 17, a voltage detection terminal 27 is held which is connected to an electrode of a battery, and a voltage detection line 61 of the voltage detection terminal and a lead wire 65 of a sensor 63 for measuring the temperature of a battery are routed. The bus bar module includes: a groove-shaped wire routing path 45 for routing the voltage detection line along an inter-electrode direction at an outer edge of the bus bar accommodation part; and a sensor accommodation part 69 for accommodating a sensor in contact with a battery by opening a bottom part 51 of the wire routing path. The lead wire of the sensor accommodated in the sensor accommodation part is led out and routed along the wire routing path.

Description

  The present invention relates to a wire routing structure for a bus bar module.

  An electric motor such as a hybrid vehicle or an electric vehicle is equipped with a power supply device configured by overlapping a plurality of batteries. This type of power supply device is configured by mounting a bus bar module on a battery assembly including a plurality of batteries in which positive and negative electrode columns are alternately arranged and assembled. In the battery assembly, the batteries are connected in series by mounting the bus bar module. The bus bar module includes a plurality of bus bars that connect the electrodes of adjacent batteries, a plurality of voltage detection terminals that are electrically connected to these bus bars, a plurality of sensors that measure the temperature of each battery, and And a resin plate to be held.

  Each bus bar is made of a flat metal plate material, and is provided with a pair of insertion holes through which the positive electrode column and the negative electrode column of adjacent batteries are respectively inserted. The voltage detection terminal has a flat electrical contact portion that contacts the bus bar and detects the voltage of the battery, and one of two electrode columns to which the bus bar is connected is inserted into the electrical contact portion. An insertion hole is provided. The sensor is supported by the plate in contact with the electrode surface of the battery on which the electrode pillar is provided.

  On the plate, a bus bar housing portion for housing the bus bar and the voltage detection terminal is formed surrounded by a frame-shaped peripheral wall. On the outer edge of the bus bar housing portion, a wire routing path is provided in which a voltage detection line connected to the voltage detection terminal and a lead wire connected to the sensor are routed.

  In FIG. 6, the electric wire wiring structure of the bus bar module of patent document 1 is shown. In this structure, the bus bar module 103 assembled to the battery 101 is viewed from obliquely above. The electric wire routing path 105 is provided in a groove shape along the direction between the electrodes 111a and 111b on the outer edge of the bus bar accommodating portion 109 on the plate 107, and is a voltage detection line under the lid portion 113 that opens and closes via a hinge (not shown). (Not shown) and the like are accommodated. The sensor housing portion 117 that holds the sensor 115 is provided on the opposite side of the electric wire routing path 105 with the bus bar housing portion 109 interposed therebetween.

  The lead wire (not shown) of the sensor 115 reaches the electric wire routing path 105 via the lead wiring routing paths 121a and 121b formed along the peripheral wall 119 of the bus bar housing portion 109. Along with the voltage detection line, it is routed to the end of the plate 107 and led out to the outside.

JP 2011-60675 A

  However, in the electric wire routing structure of Patent Document 1, the sensor accommodating portion 117 and the electric wire routing path 105 are provided on both sides of the bus bar accommodating portion 109. Therefore, in order to guide and route the lead wire to the electric wire routing path 105, a lead wire routing path is provided by bypassing the bus bar accommodating portion 109 from the sensor accommodating portion 117 to the electric wire routing path 105. As a result, there is a problem that the structure of the bus bar module 103 becomes complicated and it is difficult to reduce the size. In addition, there is a problem that the length of the lead wire becomes longer.

  An object of the present invention is to reduce the size and structure of a bus bar module and to reduce the length of a lead wire.

  In order to solve the above-mentioned problems, the present invention is connected to the battery electrode in a resin bus bar housing portion that houses a bus bar that connects the electrodes of adjacent batteries of a battery assembly composed of a plurality of batteries. In the electric wire routing structure of the bus bar module in which the voltage detection terminal is held and the voltage detection line of the voltage detection terminal and the lead wire of the sensor for measuring the temperature of the battery are routed, the bus bar module accommodates the bus bar. A groove-shaped electric wire arrangement path for arranging the voltage detection line along the direction between the electrodes on the outer edge of the section, and a sensor accommodating section for accommodating the sensor in contact with the battery by opening the bottom of the electric wire arrangement path The lead wire of the sensor accommodated in this sensor accommodating part is pulled out, and it is made to wire in an electric wire wiring path, It is characterized by the above-mentioned.

  According to this, when guiding the lead wire from the sensor housing portion to the wire routing path, the lead wire drawn out from the wire routing route or the vicinity thereof is routed to the wire routing route without bypassing the bus bar housing portion. Therefore, the length of the lead wire can be remarkably shortened. Further, since there is no need to provide a dedicated routing path for routing the lead wires, the bus bar module can be reduced in size and the structure can be simplified.

  In this case, the bus bar housing portion is formed by being surrounded by a frame-shaped peripheral wall, and the lead wire of the sensor housed in the sensor housing portion is drawn into the bus bar housing portion, and this lead wire is formed on the peripheral wall. It shall be made to pass through a slit and to be wired in an electric cable wiring path.

  In this way, the lead wire can be given a predetermined extra length by being drawn into the bus bar housing portion and then drawn out to the electric wire routing path. Therefore, even if some external force acts on the lead wire or sensor routed in the cable routing path and these positions move, the movement can be absorbed by the extra length of the lead wire. Disconnection can be prevented.

  Further, the slit is preferably formed with a slit width in which both the voltage detection line and the lead line can be press-fitted.

  By setting the slit width in this way, the voltage detection line and the lead wire can be held by the slit portions, respectively, so that disconnection can be prevented not only in the lead wire but also in the voltage detection line.

  According to the present invention, the bus bar module can be miniaturized and the structure can be simplified, and the length of the lead wire can be shortened.

It is a top view which shows the electric wire wiring structure when the bus bar module to which this invention is applied is mounted | worn with a battery assembly. It is a perspective view which expands and shows the principal part of the bus bar module with which the battery assembly was mounted | worn. It is sectional drawing when FIG. 2 is seen from an arrow direction. FIG. 3 is a perspective view in which lead wires are routed in FIG. 2. It is a perspective view which shows the external appearance of a sensor. It is a perspective view which expands and shows the principal part of the conventional bus bar module.

  Hereinafter, an embodiment of a wire arrangement structure of a bus bar module to which the present invention is applied will be described with reference to the drawings. The electric wire routing structure of the bus bar module of the present embodiment is mounted on, for example, an electric vehicle that travels by the driving force of an electric motor, a hybrid vehicle that travels by the driving force of both an engine and an electric motor, and the like. The present invention is applied to a power supply device that supplies electric power.

  FIG. 1 shows a part of a power supply device 15 configured by mounting a bus bar module 13 on a battery assembly 11 (battery). The battery assembly 11 includes a plurality of batteries 17 formed in a rectangular parallelepiped shape and a fixing member (not shown) that fixes the batteries 17 by overlapping each other. A pair of cylindrical electrode columns project from one end side and the other end side of the electrode surface 19 of each battery 17, and one electrode column is a positive electrode (hereinafter referred to as positive electrode column 21) and the other electrode column. Is a negative electrode (hereinafter referred to as negative electrode column 23). The plurality of batteries 17 are arranged in the opposite direction so that the positive poles 21 and the negative poles 23 are alternately arranged between the adjacent batteries 17.

  A bus bar module 13 is attached to the electrode surface 19 of the battery assembly 11. The bus bar module 13 has a flat plate shape as a whole, and includes a plurality of bus bars 25 that electrically connect the positive electrode columns 21 and the negative electrode columns 23 of the adjacent batteries 17 of the battery assembly 11, and each battery 17. A plurality of voltage detection terminals 27 for measuring voltage, and a resin plate 29 for holding the bus bar 25 and the voltage detection terminals 27 are provided.

  The bus bar 25 is a metal plate, and is provided with a pair of insertion holes (not shown) through which the positive poles 21 and the negative poles 23 of the adjacent batteries 17 are respectively inserted. The voltage detection terminal 27 includes a crimping portion 31 to which a voltage detection line (described later) is crimped, and a flat electrical contact portion 33 extending from the crimping portion 31. An insertion hole (not shown) through which one of the positive electrode column 21 and the negative electrode column 23 of the adjacent battery 17 is inserted is provided.

  The plate 29 includes a first plate 35 and a second plate 37 that extend in the longitudinal direction (the left-right direction in FIG. 1), and a connection portion 39 that connects them to each other. The first plate 35 and the second plate 37 are arranged in parallel with a space therebetween, and these plates include a bus bar accommodating portion 41 that accommodates the bus bar 25 and the voltage detection terminal 27, and the adjacent bus bar accommodating portion 41. A connecting portion 43 that connects the two and a groove-shaped electric wire routing path 45 that accommodates a voltage detection line (described later) are integrally formed.

  As shown in FIG. 1, a plurality of bus bar accommodating portions 41 are arranged along the longitudinal direction of each plate. The bus bar accommodating portions 41 of the first plate 35 and the bus bar accommodating portions 41 of the second plate 37 are arranged in a staggered manner along the longitudinal direction of each plate. The bus bar accommodating portion 41 is formed by being surrounded by a substantially rectangular peripheral wall 49 that rises in a frame shape from the bottom wall 47 of each plate. On the bottom wall 47 of the bus bar accommodating portion 41, the positive column 21 and the negative column 23 are respectively provided. A pair of electrode through holes (not shown) are provided.

  The electric wire routing path 45 is provided along the longitudinal direction of each plate at the outer edge (outside of the peripheral wall) of each bus bar accommodating portion 41. The plurality of electric wire routing paths 45 provided on each plate are arranged such that adjacent electric wire routing paths 45 are spaced apart from each other, but these electric wire routing paths 45 are arranged along the same straight line. .

  Each electric wire routing path 45 is formed between a bottom 51 (not shown) and a pair of side walls 53a and 53b. In this embodiment, in order to design the bus bar module 13 as compactly as possible, the electric wire routing path 45 is provided along the peripheral wall 49 of the bus bar accommodating portion 41. That is, of the pair of side walls 53 that form the electric wire routing path 45, one side wall 53 a is the peripheral wall 49 a that forms the bus bar accommodating portion 41, and the other side wall 53 b is integrally raised from the plate 29. Provided.

  In the bus bar accommodating portion 41, the bus bar 25 and the voltage detection terminal 27 are held overlapping each other. That is, the bus bar 25 is overlaid on the bottom wall 47 of the bus bar accommodating portion 41 and is locked by the claw portion 57 protruding from the peripheral wall 49. Further, the electric contact portion 33 of the voltage detection terminal 27 is overlaid on the bus bar 25, and the electric contact portion 33 is locked by a claw portion 57 protruding from the peripheral wall 49.

  The crimp part 31 of the voltage detection terminal 27 is accommodated in a crimp accommodation part 59 formed at one corner of the bus bar accommodation part 41. A voltage detection line 61 is crimped and connected to the crimping portion 31 of the voltage detection terminal 27. The voltage detection line 61 is extracted from the bus bar accommodating portion 41 (described later) and routed in the wire routing path 45.

  Next, the electric wire routing structure of the bus bar module, which is a characteristic configuration of the present embodiment, will be described with reference to FIGS. 2 is a perspective view showing the main part of the bus bar module mounted on the battery assembly, FIG. 3 is a cross-sectional view when FIG. 2 is viewed from the direction of the arrow, and FIG. It is the perspective view made to search.

  In the bus bar module 13 of the present embodiment, lead wires 65 of sensors 63 (for example, thermistors) that measure the surface temperature of each battery 17 of the battery assembly 11 are routed. As will be described later, the sensor 63 is held between the battery 17 and the bus bar module 13 (plate) while being in contact with the electrode surface 19 of the battery 17.

  As shown in FIG. 2, the bus bar module 13 is provided with an opening 67 that penetrates the bottom 51 of the electric wire routing path 45. Inside the opening 67 is a sensor accommodating portion 69 formed so as to accommodate the sensor 63. As shown in FIG. 3, the sensor accommodating portion 69 is basically a gap between the electrode surface 19 of the battery 17 and the back surface of each plate 35, 37, that is, the back surface of the bottom portion 51 of the wire routing path 45. For example, a cylindrical member that holds the sensor 63 from the opening 67 in the insertion direction of the sensor 63 may be formed extending from the plates 35 and 37. The sensor accommodating portion 69 is formed so as to hold the posture within a predetermined range without protruding from the opening 67 in a state where the sensor 63 inserted from the opening 67 is in contact with the electrode surface 19 of the battery 17. .

  As shown in FIG. 3, the peripheral wall 49 that is continuous with the opening 67 is provided with a window portion 71 that is continuous with the opening 67 and is formed by cutting out into a rectangular shape. The bottom wall 47 on the inner side of the bus bar accommodating portion 41 is provided with an outlet 73 that is connected to the opening 67 and for drawing out the lead wire 65 of the sensor 63 accommodated in the opening 67. The outlet 73 is described separately from the opening 67 for convenience of explanation, but is a portion formed by extending the opening 67 to the inside of the bus bar accommodating portion 41 and forms a part of the opening 67. ing.

  The bus bar accommodating portion 41 is provided with a routing space 75 for routing the lead wire 65 and the voltage detection wire 61 in addition to the original space for holding the bus bar 25 and the voltage detection terminal 27. This wiring space 75 is provided along the peripheral wall 49a of the bus bar accommodating portion 41 near the electric wire wiring path 45, and the outlet 73 is provided in the bottom wall 47 of this space. The window portion 71 and the outlet 73 of the peripheral wall 49a are formed in the insertion hole of the electrode column of the bus bar 25 on the opposite side to the position where the voltage detection terminal 27 is provided in the longitudinal direction of the bus bar housing portion 41 (left and right direction in FIG. 1). It is provided in the vicinity.

  As shown in FIG. 2, the peripheral wall 49a is provided with a slit 77 extending in the height direction of the peripheral wall 49a at a position shifted from the window 71 in the longitudinal direction of the bus bar accommodating portion 41. The corners of the pair of peripheral walls 49a that form the upper ends of the slits 77 are chamfered 78, respectively. The slit 77 is set to a slit width in which both the voltage detection line 61 and the lead wire 65 can be press-fitted, that is, a slit width smaller than the outer diameter of either the voltage detection line 61 or the lead wire 65.

  As shown in FIG. 5, the sensor 63 includes a sensor body 79 formed in a rectangular parallelepiped shape, a pair of left and right elastic elastic arms 81 projecting obliquely upward from the sensor body 79, and the sensor body An elastic holding arm 83 that is curved and protrudes upward from a side surface to which the elastic arm 81 is not connected is provided. The lead wire 65 is connected to the side surface of the sensor main body 79 to which the holding arm 83 is connected.

  When the bus bar module 13 holding the bus bar 25 and the voltage detection terminal 27 is mounted on the electrode surface 19 of the battery assembly 11, the positive column 21 and the negative electrode are respectively inserted into the pair of insertion holes formed in each bus bar 25. The column 23 is inserted, and either the positive column 21 or the negative column 23 is inserted into the insertion hole of the voltage detection terminal 27. Each electrode column is formed with a thread groove, and the bus bar 25 and the voltage detection terminal 27 are electrically connected to the pair of electrode columns by screwing the nut 85, respectively.

  As shown in FIG. 1, the voltage detection line 61 connected to the crimping portion 31 of the voltage detection terminal 27 is press-fitted into the slit 77 through the routing space 75 of the bus bar housing portion 41, and this press-fitting is performed. A portion is held in the slit 77. The voltage detection line 61 that has exited the slit 77 is introduced into the wire routing path 45 that traverses just before the slit 77, and is routed in a bundle while merging with the voltage detection line 61 that has exited from the other bus bar accommodating portion 41. The bundle of voltage detection lines 61 routed through the wire routing path 45 of each plate joins at the connection portion 39 and is led out to the outside.

  On the other hand, when assembling the sensor 63 (with the lead wire connected), the sensor 63 is inserted into the opening 67 of the electric wire routing path 45. At this time, the bus bar module 13 is mounted on the battery assembly 11 with the portion protruding from the back surface of the plate 29 facing the electrode surface 19 of the battery assembly 11 in contact with the electrode surface 19. A predetermined gap is formed between the back surface of the plate 29 and the sensor accommodating portion 69 is secured.

  When the sensor 63 is inserted into the opening 67, the pair of elastic arms 81 are elastically deformed in the closing direction. As shown in FIG. 3, when the sensor main body 79 comes into contact with the electrode surface 19, the movement of the sensor 63 in the insertion direction is prevented, and at the same time, the opening 67 is formed on the peripheral edge facing the electrode surface 19. The upper ends 89 of the pair of elastic arms 81 whose elastic deformation has been restored are respectively engaged with the stepped portions 87. Thereby, the movement of the sensor main body 79 in the X direction and the Z direction (FIG. 5) is suppressed, and the side surface opposite to the side surface of the sensor main body portion 79 to which the holding arm 83 and the holding arm 83 are connected, The movement of the sensor main body 79 in the Y direction (FIG. 5) is suppressed by abutting against a wall (not shown) formed in the sensor accommodating portion 69.

  When the sensor 63 is assembled in the sensor housing portion 69 in this way, the lead wire 65 connected to the sensor 63 is pulled out from the outlet 73 into the bus bar housing portion. As shown in FIG. 4, the lead wire 65 drawn out from the outlet is press-fitted into the slit 77 through the routing space 75 of the bus bar accommodating portion 41, and this press-fitted portion is held in the slit 77. . The lead wire 65 that exits the slit 77 is guided to the wire routing path 45 that traverses just before it, and is routed in a bundle while joining the lead wire 65 and the voltage detection wire 61 that have exited from the other bus bar housing portion. The A bundle of these wires routed through the wire routing path 45 of each of the plates 35 and 37 joins at the connecting portion 39 and is led out to the outside.

  As described above, in the present embodiment, the electric wire routing path 45 is formed along the direction between the electrodes on the outer edge of the bus bar accommodating portion 41, and the sensor accommodating portion 69 is overlapped with the electric wire routing path 45. Since it is provided below, the lead wire 65 can be drawn out from the vicinity of the wire routing path 45 and routed to the wire routing path 45, so that the routing length of the lead wire 65 can be shortened. In addition, since it is not necessary to provide a dedicated routing path for routing the lead wire 65, the structure of the bus bar module 13 can be reduced in size and simplified. Furthermore, according to the present embodiment, since the conventional electric wire routing path (reference numeral 105 in FIG. 6) is not required, the area A can be eliminated and the bus bar module 13 can be reduced in size as shown in FIG. be able to.

  In the present embodiment, since the lead wire 65 is drawn into the bus bar housing portion 41 and then pulled out to the electric wire routing path 45 through the slit 77, the lead wire 77 is used for routing in the bus bar housing portion 41. It is possible to provide an extra length for wiring in the space 75. Therefore, for example, even if some external force acts on the lead wire 65 or the sensor 63 routed in the wire routing path 45 and these positions move, the movement can be absorbed by the extra length of the lead wire 65. Therefore, disconnection of the lead wire 65 can be prevented.

  Further, since the lead wire 65 and the voltage detection wire 61 are respectively held by the slits 77, some external force acts on the voltage detection wire 61 routed in the wire routing path 45 as well as the disconnection of the lead wire 65. Even if the position moves, the connection portion between the electric cable routing 45 and the voltage detection line 61 is hardly loaded, so that the disconnection of the voltage detection line 61 can be prevented.

  As mentioned above, although embodiment of this invention has been explained in full detail with drawing, the said embodiment is only an illustration of this invention and this invention is not limited only to the structure of the said embodiment. Needless to say, changes in design and the like within the scope of the present invention are included in the present invention.

  For example, in the present embodiment, the example in which the outlet 73 for drawing out the lead wire 65 is provided in the bus bar housing portion 89 has been described. However, there is no problem of interference with other electric wires arranged in the electric wire arrangement path 45. For example, it is possible to provide the outlet 73 in the electric wire routing path 45.

DESCRIPTION OF SYMBOLS 11 Battery assembly 13 Bus bar module 15 Power supply device 17 Battery 19 Electrode surface 21 Positive pole 23 Negative pole 25 Bus bar 27 Voltage detection terminal 29 Plate 31 Crimping part 33 Electrical contact part 41 Bus bar accommodating part 45 Electric wire routing path 47 Bottom wall 49 Peripheral wall 51 Bottom 53a, 53b Side wall 61 Voltage detection line 63 Sensor 65 Lead wire 67 Opening 69 Sensor accommodating part 71 Window part 73 Outlet 75 Routing space 77 Slit 79 Sensor body part 81 Elastic arm 83 Holding arm 87 With step portion

Claims (3)

A voltage detection terminal connected to the electrode of the battery is held in a resin bus bar housing portion that houses a bus bar that connects between the electrodes of adjacent batteries of a battery assembly composed of a plurality of batteries, and this voltage In the wire routing structure of the bus bar module in which the voltage detection wire of the detection terminal and the lead wire of the sensor for measuring the temperature of the battery are routed,
The bus bar module includes a groove-shaped electric wire routing path for routing the voltage detection line along the direction between the electrodes on the outer edge of the bus bar housing portion, and opens the bottom portion of the electrical wiring routing path so that the sensor is A sensor accommodating portion for accommodating in contact with the battery;
An electric wire routing structure for a bus bar module, wherein a lead wire of the sensor accommodated in the sensor accommodating portion is pulled out and routed in the electric wire routing path. The bus bar accommodating portion is formed surrounded by a frame-shaped peripheral wall,
The lead wire of the sensor housed in the sensor housing portion is pulled out into the bus bar housing portion, and the lead wire pulled out is passed through the slit formed in the peripheral wall and is routed in the wire routing path. The electric wire routing structure of the bus bar module according to claim 1.   The wire arrangement structure of the bus bar module according to claim 1 or 2, wherein the slit is formed with a slit width in which both the voltage detection line and the lead wire can be press-fitted.

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