JP6053643B2 - In-battery wiring module of battery pack - Google Patents

Description

  The present invention relates to an in-battery wiring module that is attached to a battery module configured by overlapping a plurality of battery cells and connects the battery cells in series, and more particularly, to an in-battery wiring module that has good attachment to the battery 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. growing.
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 connects and separates the connection portions so that the bus bars provided in the connection portions correspond to the electrodes. 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

  It is an object of the present invention to provide an in-battery wiring module that has excellent attachment properties to the battery module and that is resistant to damage to the in-battery wiring module and the devices related thereto.

The present invention 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 battery cells are connected in series to connect the plurality of battery cells in series. A wiring module in a battery in which a plurality of bus bars connecting positive and negative electrodes of the battery cells adjacent in the overlapping direction are arranged on a wiring base material, wherein the wiring base material is a part of the battery module. It is attached to the surface having electrodes, and is composed of a sheet having flexibility and insulation, and is provided along the overlapping direction on the surface of the sheet constituting the wiring base, and one end of the bus bar. voltage and that conductive wire placement unit to place the monitor line connected to, in the cross direction intersecting the superposition direction of the conductor arrangement portion, a plurality of Configured the serial bus bar in the bus bar arrangement unit which arranged at a predetermined interval in the superposition direction, the bus bar arrangement section, wherein the bus bar holding means for holding the busbar detachably provided.

  Here, the said wiring base material can be comprised with the sheet | seat formed with the synthetic resin etc. which have softness | flexibility and insulation, such as foaming resin and a polyethylene terephthalate (PET), for example. In addition, the overlapping direction includes, for example, those overlapping in the horizontal direction in addition to the vertical direction.

  In addition, the electric wire arrangement part is constituted by, for example, a guide part provided with a groove part for holding a voltage monitoring line, a concave or convex rib part, or a wiring guide piece separated by leaving a root by a slit. Can do.

  According to the present invention, it is possible to provide an in-battery wiring module that is excellent in the attachment property to the battery module and that is resistant to damage to the in-battery wiring module and a device related thereto.

More specifically, since the bus bar arrangement portion in which a plurality of bus bars are arranged is formed on a flexible sheet-like wiring base material, when the in-battery wiring module is attached to the battery module, the wiring base material itself is flexible. Due to the deformation, the bus bar in the bus bar arrangement portion is displaced according to the electrode of the battery cell, so that the difference in pitch between the electrodes in the adjacent battery cell, that is, the tolerance can be absorbed.
If the sheet-like wiring base material constituting the bus bar arrangement part itself is bent or bent and deformed, the surface on which the in-battery wiring module is attached and the surface having the battery cell electrode are different. Is also available.

  In addition, due to the flexible deformation of the wiring base material itself, the bus bars arranged in the bus bar arrangement portion can be easily displaced, and the adjacent bus bars can be freely displaced from each other, thereby suppressing the transmission of strain.

That is, since the bus bar arranged in the bus bar arrangement portion can be easily displaced, the bus bar can be prevented from being damaged, strain transmission can be suppressed, and the wiring substrate can be prevented from being weakened. As a result, durability can be improved.
As a result, the in-battery wiring module can be easily attached to the battery module, and workability is improved.

  In addition, since the bus bar holding portion is provided with the bus bar holding means for detachably holding the bus bar, the bus bar holding means holds the bus bar and enables 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, in the bus bar arrangement portion, a slit that is notched in the intersecting direction can be provided between the adjacent bus bars.
According to this invention, the attachment property with respect to the battery module of the in-battery wiring module can be further improved.

More specifically, when the in-battery wiring module is attached to the battery module, in addition to the deformation of the wiring base material itself, the deformation between the adjacent bus bars is allowed by the width of the slit formed between the bus bars. That is, the bus bar is further displaced in accordance with the electrode of the battery cell by the synergistic action of the deformation of the wiring substrate itself and the deformation of the slit, so that the difference in pitch between the electrodes can be absorbed more.
As a result, even when the surface on which the in-battery wiring module is attached and the surface having the battery cell electrodes are greatly different, it is possible to cope with the problem more reliably.

  Furthermore, since the transmission of strain between the bus bars is blocked by the slits, for example, even if a part of the bus bar arrangement part is displaced, the distortion due to the displacement is blocked by the slits, so other parts of the bus bar arrangement part Moreover, it can avoid that a load acts on the bus bar of another part, and can improve the durability of a wiring base material and a bus bar.

Moreover, as an aspect of this invention, the said bus-bar arrangement | positioning part can be arrange | positioned at the both sides of the said crossing direction with respect to the said electric wire arrangement | positioning part.
According to this invention, the bus bars can be arranged shifted in the overlapping direction on both sides of the wiring substrate.

  Thereby, since the bus bar arrange | positioned at the bus-bar arrangement | positioning part of both sides enables the connection with the electrode of the both sides of a battery cell, series connection of a battery cell is attained by attachment of the wiring module in a battery.

As an aspect of the present invention, a voltage monitoring unit main body for connecting the voltage monitoring line can be mounted on the wiring substrate.
According to this invention, since the wiring base material includes the voltage monitoring unit main body for connecting the voltage monitoring line, when attaching to the battery module, the voltage monitoring unit main body is also attached together only by attaching the in-battery wiring module. Is possible. That is, the mounting workability is significantly improved.

As an aspect of the present invention, unit fixing means for fixing the voltage monitoring unit main body to the wiring base material can be provided.
Here, the unit fixing means may be, for example, a lock structure in which the voltage monitoring unit body is fitted and fixed to a rib portion, a protrusion, a recess, or the like, or a slide type in which the voltage monitoring unit body is slid and locked to the locking portion. A lock structure or the like can be used.

  According to this invention, the voltage monitoring unit main body can be reliably fixed at a predetermined position on the wiring substrate by the unit fixing means. If the fixing of the voltage monitoring unit main body by the unit fixing means is released, the voltage monitoring unit main body can be removed from the wiring substrate. For this reason, workability at the time of recycling is good.

Further, the present invention 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 battery is connected to connect the plurality of battery cells in series. A wiring substrate on which a plurality of bus bars connecting positive and negative electrodes of the battery cells adjacent in the cell stacking direction are arranged, the wiring substrate having the electrodes of the battery module And a voltage that is configured with a sheet having flexibility and insulation, is provided along the overlapping direction on the surface of the sheet constituting the wiring substrate, and has one end connected to the bus bar. and that conductive lines disposed portion to place the monitor line, in the cross direction intersecting the superposition direction of the conductor arrangement portion, a plurality of the bus bars the Configured root alignment direction by the bus bar arrangement unit be disposed at a predetermined distance, the bus bar arrangement section, wherein the bus bar holding means for holding the busbar detachably provided.

  More specifically, the flexible deformation of the sheet-like wiring base material itself constituting the bus bar arrangement part causes the bus bar arranged in the bus bar arrangement part to be displaced according to the electrode of the battery cell. The tolerance can be absorbed, and the case where the surface on which the in-battery wiring module is attached and the surface having the electrode of the battery cell are different can be dealt with.

  In addition, due to the flexible deformation of the wiring base material itself, the bus bars arranged in the bus bar arrangement portion can be easily displaced, and the adjacent bus bars can be freely displaced from each other, thereby suppressing the transmission of strain.

  That is, since the bus bar arranged in the bus bar arrangement portion can be easily displaced, the bus bar can be prevented from being damaged, and the strain transmission can be suppressed, so that the wiring substrate can be prevented from being weakened, and as a result, the durability can be improved. You can plan.

  In addition, since the bus bar holding portion is provided with the bus bar holding means for detachably holding the bus bar, the bus bar holding means holds the bus bar and enables the bus bar to be removed during recycling. For this reason, workability at the time of recycling is good.

Furthermore, the present invention can constitute a battery module to which the in-battery wiring module is attached.
According to this invention, the displacement of the bus bar arranged in the bus bar arrangement part in the in-battery wiring module is made flexibly in accordance with the electrode of the battery cell by the flexible deformation of the wiring substrate itself having a sheet shape. In addition to preventing damage, distortion transmission can be suppressed by flexible deformation of the wiring base material itself, and weakening of the wiring base material itself can be prevented. In addition, the voltage monitoring line can 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 on the wiring base material itself, the assemblability of the battery module to which the in-battery wiring module is attached can be improved.

Furthermore, the present invention can constitute a battery pack in which a battery module to which the in-battery wiring module is attached is accommodated.
According to this invention, the displacement of the bus bar arranged in the bus bar arrangement part in the in-battery wiring module is made flexibly in accordance with the electrode of the battery cell by the flexible deformation of the wiring base material itself, so that damage to the bus bar can be prevented. In addition, since the transmission of strain can be suppressed by flexible deformation of the wiring substrate itself, the wiring substrate itself can be prevented from becoming weak. In addition, the voltage monitoring line can 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 and the battery pack that houses the battery module. In addition, since the voltage monitoring line is connected to the bus bar and is held by the wiring base material itself, the assemblability of the battery pack that houses the battery module to which the in-battery wiring module is attached can be improved.

  According to the present invention, the mounting property of the in-battery wiring module to the battery module is good, and the in-battery wiring module, the wiring substrate used therefor, the battery module having the in-battery wiring module attached thereto, and the battery pack are provided. Durability can be improved.

The perspective view of the wiring module in a battery of this embodiment. The perspective view of the battery module which attached the wiring module in a battery. The side 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 which shows the state which attaches the wiring module in a battery to a battery module. The expansion perspective view of a bus-bar and a bus-bar arrangement | positioning part. The top view which shows the action state of the wiring module in a battery, and a wiring base material. The expansion perspective view which shows the other wiring example of a voltage monitoring line. The side view which shows the other example of attachment of the wiring module in a battery. The side view which shows the other example of the electrode protection structure of the wiring module in a battery. The perspective view which shows the other example of attachment of the wiring module in a battery. The perspective view which shows the other example of a connection of a voltage monitoring unit main body. The perspective view which shows the other example of a connection of a voltage monitoring unit main body. The top view which simplified the example of wiring of the wiring module in a battery.

An embodiment of the present invention will be described in detail with reference to the drawings.
1 is a perspective view of the in-battery wiring module 11 according to the present embodiment, FIG. 2 is a perspective view of the battery module 72 to which the in-battery wiring module 11 is attached, and FIG. 3 is a side view of the battery module 72 to which the in-battery wiring module 11 is attached. 4 is a perspective view of a battery pack 75 containing the battery module 72, FIG. 5 is a perspective view showing a state where the in-battery wiring module 11 is attached to the battery module 72, and FIG. 6 is an enlarged view of the bus bar 12 and the bus bar arrangement portion 53. It is a perspective view.
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 14 are drawings for explaining other examples.

  The in-battery wiring module 11 shown in FIG. 1 is attached to the upper surface 71b of a battery module 72 formed by stacking a plurality of battery cells 71 shown in FIG. 2, and is connected to the battery cells 71 in series. A bus bar 12 connected to an electrode post 73 as an electrode of the battery cell 71, a voltage monitoring line 13 having one end connected to the bus bar 12, a voltage monitoring unit main body 14 connecting the other end of the voltage monitoring line 13, and a sheet It is the structure with which the wiring base material 15 of the shape was equipped.

  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 a battery housing box 74 as shown in FIG.
The number of battery modules 72 is not limited to the illustrated example, and is configured by one or more. When the number of battery modules 72 is two or more, the battery modules 72 are connected in series (not shown).

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 71a, and the electrode posts on both the left and right sides of the upper surface 71b when the vertical surface 71a is in an upright posture. 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. On the outer peripheral surfaces of the positive electrode post 73a and the negative electrode post 73b, there are external threads on the outer peripheral surface that allow the nut 16 to be screwed (see an enlarged view of a portion in FIG. 3).

  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 X of the battery cells 71 on both sides.

  At this time, the battery cells 71 are staggered so that the electrode posts 73 adjacent in the overlapping direction X 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 direction.

In addition, although the separator for ensuring a cooling channel | path is interposed between the battery cells 71, illustration of the separator is abbreviate | omitted for convenience.
Next, the in-battery wiring module 11 will be described.

As shown in FIG. 5, the in-battery wiring module 11 includes the bus bar 12, the voltage monitoring line 13, the voltage monitoring unit main body 14, and the sheet-like wiring base material 15.
The wiring substrate 15 is composed of a sheet formed of a synthetic resin having flexibility and insulation, and is formed in a size and shape that covers the entire upper surface 71b of the battery module 72.

  At the center of the wiring substrate 15 in the intersecting direction Y orthogonal to the overlapping direction X, an electric wire arranging part 19 for arranging the voltage monitoring line 13 having one end connected to the bus bar 12 is provided. A plurality of voltage monitoring lines 13 and the voltage monitoring unit main body 14 are arranged in the electric wire arrangement portion 19.

Bus bar arrangement portions 53 for arranging the plurality of bus bars 12 with respect to the overlapping direction X are formed on both side portions in the cross direction Y orthogonal to the overlapping direction X in the electric wire arrangement portion 19.
In the bus bar arrangement portion 53, a plurality of bus bars 12 are arranged at a predetermined interval with respect to the overlapping direction X. The adjacent bus bars 12 are separated from each other by an interval 54 that is insulated from each other (see FIG. 6).

Furthermore, between the adjacent bus bars 12 in the bus bar arrangement portion 53, slits 52 that are notched in a direction orthogonal to the overlapping direction X (cross direction Y) are formed. The length of the slit 52 is set to a length at which the interval between the adjacent bus bars 12 is divided in the direction orthogonal to the overlapping direction X.
The number and length of the bus bars 12 and the length of the bus bar arrangement portion 53 are not limited to the illustrated example, and are set according to the number of battery cells of the battery module 72 to be applied.

As shown in FIG. 6, the bus bar arrangement unit 53 includes a first bus bar arrangement unit 53 a that arranges the bus bars 12 and a second bus bar arrangement unit 53 b.
The first bus bar arrangement portion 53a is formed on both sides of the electric wire arrangement portion 19 in the intersecting direction Y corresponding to the electrode posts 73 of the battery cells 71 arranged on the inner side of both ends of the battery module 72 in the overlapping direction X. ing.

  The second bus bar arrangement portion 53 b is formed at the end portion of the bus bar arrangement portion 53 in the overlapping direction X corresponding to the electrode posts 73 of the battery cells 71 arranged at both ends in the overlapping direction X of the battery module 72. .

  In the arrangement surface of the first bus bar arrangement portion 53a and the second bus bar arrangement portion 53b, an opening hole 53c that allows insertion of the electrode post 73 of the battery cell 71 is formed corresponding to the through hole 21 of the bus bar 12. doing.

  The bus bar 12 arranged in the above-described bus bar arrangement part 53 is made of a single conductive plate material, and has a substantially rectangular bus bar 12a for connecting the electrode posts 73 of adjacent battery cells 71 in the battery module 72. The battery module 72 is configured by a substantially square bus bar 12b for connection to the electrode posts 73 of the battery cells 71 disposed at both ends of the battery module 72 (see FIG. 6).

  The first bus bar arrangement portion 53a for arranging the bus bar 12a and the second bus bar arrangement portion 53b for arranging the bus bar 12b are respectively formed in a size and a shape that allow the arrangement of the bus bars 12a and 12b. .

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 (12a) has an intersecting direction Y in the wiring substrate 15. One through hole 21 connected to the positive electrode post 73a and one through hole 21 connected to the negative electrode post 73b except for the bus bar 12b at a position corresponding to the end portion in the overlapping direction X on one side of the two sides (See FIG. 6).
The interval between the through holes 21 corresponds to the interval between the electrode posts 73 of the adjacent battery cells 71.

  Further, the bus bar 12b at a position corresponding to the end portion in the overlapping direction X on one side of the both sides in the cross direction Y of the wiring substrate 15 is provided with 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 first bus bar arrangement portion 53a and the second bus bar arrangement portion 53b described above are formed.

The formation position of the slit 52 with respect to the bus bar arrangement part 53 (53 a) is an intermediate position in the overlapping direction X in the bus bar 12 arranged in the bus bar arrangement part 53.
If it adds about the slit 52 formed between the bus bars 12 in the bus-bar arrangement | positioning part 53, the slit 52 of the one side part and the other side part has shifted | deviated in the said superimposition direction X. FIG. Specifically, a slit 52 on the other side exists at an intermediate position between adjacent slits 52 on one side of the intersecting direction Y.

Further, as shown in FIG. 6, the bus bar arrangement portion 53 (53a, 53b) includes a bus bar holding portion 531 for holding the bus bar 12 (12a, 12b) in a detachable manner.
The bus bar holding portion 531 is arranged corresponding to one diagonal corner portion of the bus bar 12, and has a convex rib portion 532 that forms a right angle with which the end surface of the corner portion of the bus bar 12 abuts, and the rib portion. It is comprised with the latching claw 533 latched by the corner | angular corner upper surface of the above-mentioned bus bar 12 formed in the edge part of 532.

  The rib portion 532 described above can be fixed to the bus bar placement portion 53 using, for example, a welding unit, an adhesion unit, or the like. The above rib portion 532 may be formed by bulging a part on the upper surface side of the above.

  When the above-mentioned bus bar 12 (12a, 12b) is arranged in the bus bar arrangement part 53 (53a, 53b), the corner corner end face of the bus bar 12 abuts on the rib part 532 of the bus bar arrangement part 53 and the bus bar 12 The upper surface of the corner portion is locked to the locking claw 533 of the rib portion 532.

As a result, the bus bar 12 can be detachably held with respect to the bus bar arrangement portion 53, and the position can be regulated so that the opening hole 53 c of the bus bar arrangement portion 53 and the through hole 21 of the bus bar 12 communicate with each other. .
The holding of the bus bar 12 is not limited to the illustrated example, and can be fixed to the bus bar arrangement portion 53 using, for example, an adhesive, a pressure-sensitive adhesive, a double-sided pressure-sensitive adhesive tape, or the like.

  As shown in FIG. 5, 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. The voltage monitoring line 13 is guided to the wiring guide part 55 arranged in the electric wire arrangement part 19 in the wiring base material 15 as shown in FIG. Then, the in-battery wiring module 11 is obtained.

  As shown in FIG. 3, a unit fixing portion 57 that detachably fixes the voltage monitoring unit main body 14 is provided at the end of the electric wire arrangement portion 19 in the overlapping direction X. The unit fixing part 57 is arranged corresponding to both side surfaces of the voltage monitoring unit main body 14, and is constituted by a pair of locking parts 57a locked to the both side surfaces.

  When the voltage monitoring unit main body 14 is fixed to the electric wire arranging portion 19, both side surfaces of the voltage monitoring unit main body 14 are engaged with the engaging portions 57 a and 57 a of the unit fixing portion 57. It can be securely fixed to the end in the direction X. If both side surfaces of the voltage monitoring unit main body 14 are detached from the locking portions 57a and 57a of the unit fixing portion 57, the voltage monitoring unit main body 14 can be easily removed.

  The wiring guide part 55 is arranged corresponding to the bus bars 12 arranged in the bus bar arrangement part 53. The wiring guide part 55 has a groove part 55a in which the insertion of the voltage monitoring line 13 is allowed.

When the voltage monitoring line 13 is arranged in the electric wire arrangement part 19, the voltage monitoring line 13 connected to the bus bar 12 is respectively inserted into the groove part 55 a of the wiring guide part 55 and guided toward the voltage monitoring unit main body 14. The voltage monitoring lines 13 can be prevented from being entangled or disconnected, and the voltage monitoring lines 13 can be organized neatly.
Note that the guidance of the voltage monitoring line 13 is not limited to the illustrated example. For example, the voltage monitoring line 13 may be fixed to the electric wire placement portion 19 using an adhesive tape, a stopper, an adhesive, or the like, as described above. I can guide you to.

  The voltage monitoring line 13 is connected to the bus bar 12 by welding the terminal of the voltage monitoring line 13 using, for example, welding means such as resistance welding, fiber laser welding, or ultrasonic welding. In FIG. 6, 22 is a welding part.

In addition, after inserting the terminal of the voltage monitoring wire | line 13 in the crimping | compression-bonding part (not shown) formed in a part of bus bar 12, you may employ | adopt the structure which crimps | bonds and connects this crimping | compression-bonding part.
Further, the connection may be made via a round terminal (not shown) provided with a through hole inserted into the electrode post 73, but if the connection is made in advance by welding or crimping as described above, the round terminal Since the voltage monitoring line 13 can be wired simply by placing the bus bar 12 on the bus bar placement portion 53, the number of parts can be reduced and the assembly work can be simplified. Can be planned.

  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 6). 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 upper surface 71b side 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 pair of electrode protection members 14 having insulation properties are overlapped so as to cover the bus bar 12 and the electrode posts 73, and then the cover member 18 is attached onto the in-battery wiring module 11. The cover member 18 is appropriately formed according to the shape of the in-battery wiring module 11.

  The bus bar arrangement portion 53 in which the bus bars 12 are arranged is formed on the sheet-like wiring base material 15 having flexibility (including flexibility), and the adjacent bus bars 12 are separated by the slits 52. When the through hole 21 of the bus bar 12 is inserted into the electrode post 73, the position of the electrode post 73 (73a, 73b) to which the adjacent bus bar 12 is connected in the bus bar arrangement portion 53 is shifted as shown in FIG. However, it is displaced corresponding to the deviation.

  That is, in addition to the flexible deformation of the wiring base material 15 itself, the deformation between the adjacent bus bars 12 in the bus bar arrangement portion 53 is allowed by the width of the slit 52 formed between the bus bars 12, so By displacing the bus bar 12 according to the electrode post 73 of the battery cell 71 by the synergistic action of the flexible deformation of the material 15 itself and the deformation of the slit 52, the displacement of the electrode post 73 is more reliably absorbed. be able to.

  Therefore, the difference in pitch between the electrode posts 73, that is, the tolerance can be absorbed, and the in-battery wiring module 11 can be easily and reliably attached to the battery module 72 without applying an excessive force. .

  In addition, since the space between the bus bars 12 in the bus bar arrangement portion 53 is divided by the slits 52, even if a part of the bus bar arrangement portion 53 is displaced, distortion due to the displacement is blocked by the slits 52. Transmission to the other part of the arrangement part 53 can be avoided.

  As a result, it is not necessary to apply an excessive load to the installation of the in-battery wiring module 11, and it is possible to suppress the transmission of strain, thereby preventing the wiring substrate 15 from being damaged or weakened and improving the durability. it can.

Furthermore, it is possible to avoid a load from acting on the wiring substrate 51 and the bus bar 52, and the durability of the bus bar 52 can be further improved. 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.
Further, since the wiring base material 15 itself is flexibly deformed, it is also possible to absorb vibrations and impacts that are received during traveling of a vehicle (not shown) on which the battery pack 75 is mounted.

  Furthermore, the bus bar arrangement | positioning part 53 which has arrange | positioned the bus bar 12 is formed in the both sides of the cross direction Y in the wiring base material 15, and the bus bar 12 arrange | positioned at the bus bar arrangement | positioning part 53 of both sides is adjacent battery cells 71. If the in-battery wiring module 11 is attached to enable connection of the electrode posts 73, the battery cells 71 in the battery module 72 can be connected in series.

  For this reason, workability is better than when separate members are individually attached to both sides of the battery module 72. 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.

  Further, in addition to the bus bar 12 necessary for the series connection of the battery cells 71, the in-battery wiring module 11 is integrally provided with a voltage monitoring line 13 and a voltage monitoring unit main body 14 necessary for voltage monitoring. The assembly work of the battery module 72 and the battery pack 75 to which the wiring module 11 is attached can be simplified.

Since the wiring base material 15 in the in-battery wiring module 11 has the wiring guide portion 55 for guiding the voltage monitoring line 13, the voltage monitoring lines 13 can be prevented from being entangled or disconnected. 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 arrangement part 53, the bus bar 12 can be removed from the bus bar arrangement part 53 at the time of recycling, and separation can be performed easily.

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.
First, another example in which the voltage monitoring line 13 described above is wired to the electric wire placement unit 19 will be described.
FIG. 8 is an enlarged perspective view showing another wiring example of the voltage monitoring line 13. In the electric wire arrangement part 19, a wiring guide piece 56 for holding the voltage monitoring line 13 in correspondence with the bus bar 12 arranged in the bus bar arrangement part 53. Is arranged.

  More specifically, the wiring guide piece 56 is formed so as to be able to be deformed upward with the base end side (root side) left, with a cut made in the crossing direction Y with respect to the upper surface of the electric wire arrangement portion 19. ing. When holding the voltage monitoring line 13, the free end side of the wiring guide piece 56 is warped upward against the restoring force, and then the voltage monitoring line 13 connected to the bus bar 12 is connected to the lower surface of the wiring holding piece 56. And is held by the restoring force of the wiring guide piece 56.

  Thereby, since the voltage monitoring line 13 is guided toward the voltage monitoring unit main body 14 along the electric wire arrangement part 19, it is possible to prevent the voltage monitoring lines 13 from being entangled or disconnected from each other. Can be organized in an orderly manner.

Next, another mounting example of the in-battery wiring module 11 will be described.
FIG. 9 is a side view showing another example of attachment of the in-battery wiring module 11, and more specifically, FIG. 9A shows the upper side 71b side of the battery module 72 by flexing the in-battery wiring module 11 into a substantially gate shape. 9B is a side view of the battery wiring module 11 attached to the left and right upper surfaces 71b of the battery module 72 in two parts.

  The wiring substrate 15 of the in-battery wiring module 11 shown in FIG. 9A is composed of a sheet formed of a flexible synthetic resin. That is, even if a device (not shown) is arranged at the center on the upper surface side of the battery module 72, the in-battery wiring module 11 can be deformed and attached to a desired shape according to the structure on the upper surface side of the battery module 72. .

Further, the in-battery wiring module 11 is deformed into a substantially gate shape so as to straddle a device (not shown) and is attached to the upper surface side of the battery module 72, and the electrode posts 73 of the adjacent battery cells 71 are connected in series. The effect | action and effect substantially equivalent to embodiment can be show | played.
Moreover, the space part Z formed by transforming the in-battery wiring module 11 into a substantially gate shape can be used as a space for arranging a smoke exhausting device such as a duct, for example.

  The in-battery wiring module 11 shown in FIG. 9B has a configuration in which the bus bar arrangement portion 53 is formed only on one side portion in the cross direction Y of the wiring base material 15. That is, even if a device (not shown) is arranged at the center on the upper surface side of the battery module 72, the device can be divided and attached to the left and right upper surfaces of the battery module 72 while avoiding the device.

  Furthermore, since the in-battery wiring module 11 is connected in series with the electrode posts 73 of the adjacent battery cells 71 on the left and right upper surfaces of the battery module 72, the operation and effect substantially the same as those of the above embodiment can be achieved. .

Moreover, the space part Z formed between the left and right in-battery wiring modules 11 can be used as a space for arranging the smoke exhaust device.
Furthermore, according to this configuration, the in-battery wiring module 11 can be attached even when the electrode post 73 protrudes not in the left and right sides of the upper surface 71b (see FIG. 2) of the battery cell 71 but near the center.

  In addition, you may form the opening part in which the arrangement | positioning of the said apparatus is accept | permitted in the electric wire arrangement | positioning part 19 of the wiring base material 15, and it can attach to the upper surface side of the battery module 72 avoiding this apparatus.

Next, another example of the electrode protection structure in the in-battery wiring module 11 will be described.
FIG. 10 is a side view showing another example of the electrode protection structure of the in-battery wiring module 11.

More specifically, both side portions of the wiring base material 15 in the cross direction Y are extended in the cross direction Y by a predetermined length so as to be superposed on the upper surface side of the bus bar 12 arranged in the bus bar arrangement portion 53. Yes. The bus bar arrangement 53 is arranged busbar 12 to which the voltage monitoring line 13 is connected.

When the in-battery wiring module 11 is attached to the upper surface of the battery module 72, the both sides of the wiring base material 15 in the cross direction Y are folded upward and overlapped so as to cover the bus bar 12 arranged in the bus bar arrangement part 53. The bus bar 12 can be reliably protected without using the electrode protective material 17.
Thereby, the component of the wiring module 11 in a battery can be decreased, and the workability | operativity at the time of attachment can be improved more.

Next, a description will be given of the other attachment example of a battery in the wiring module 11.
FIG. 11 is a perspective view showing another example of attachment of the in-battery wiring module 11. Specifically, even when the electrode post 73 protrudes from the side surface 71 c instead of the upper surface 71 b of the battery cell 71, the upper surface of the battery module 72 is shown. It is a perspective view of the wiring module 11 in a battery which was able to attach and connect.

  The in-battery wiring module 11 shown in FIG. 11 extends from the both sides of the wiring substrate 15 in the intersecting direction Y by a predetermined length in the intersecting direction Y, with respect to the side surface 71c of the battery cell 71 protruding the electrode post 73. It is formed so that it can be overlapped.

  When the in-battery wiring module 11 is attached to the upper surface of the battery module 72, both sides of the wiring base material 15 in the cross direction Y are bent downward and overlapped with the side surface 71c of the battery cell 71 from which the electrode post 73 protrudes.

  At that time, the electrode post 73 protruding from the side surface 71c of the battery cell 71 is inserted into the through hole 21 of the bus bar 12 arranged in the bus bar arrangement portion 53 and is fastened and fixed by the nut 16. The electrode posts 73 can be connected in series.

  Thereby, the in-battery wiring module 11 can be attached also to the battery module 72 in which the electrode post 73 protrudes from the side surface 71c of the battery cell 71, and can exhibit substantially the same operation and effect as the above embodiment.

  Next, in the above-described embodiment, the mounting example in which the voltage monitoring unit main body 14 of the in-battery wiring module 11 is mounted on the wiring base material 15 has been described. However, the voltage monitoring unit main body 14 is mounted on the wiring base material 15. The connector 44 may be provided so as to be connectable.

FIG. 12 is a perspective view showing another connection example of the voltage monitoring unit main body 14, and FIG. 13 is a perspective view showing another connection example of the voltage monitoring unit main body 14.
More specifically, the in-battery wiring module 11 shown in FIG. 12 connects the voltage monitoring line 13 connected to the bus bar 12 to the electric wire connecting portion 41 of the connector 44 mounted on the wiring base material 15 to monitor the voltage. The unit body 14 is fitted and connected to the connector 44.

  In the in-battery wiring module 11 shown in FIG. 13, the voltage monitoring line 13 connected to the bus bar 12 is connected to the connector 44 mounted on the wiring substrate 15, and the voltage monitoring unit main body 14 is fitted to the connector 44. And connect.

  According to the above-described configuration, the connection between the voltage monitoring unit main body 14 and the voltage monitoring line 13 is made via the connector 44, so that the connection work of the voltage monitoring line 13 on the wiring substrate 15 is omitted, and the assembly work is performed. Simplification can be achieved.

Next, a wiring example of the voltage monitoring line 13 in the in-battery wiring module 11 will be described.
FIG. 14 is a simplified plan view of the wiring example of the in-battery wiring module 11. Specifically, FIG. 14A shows the voltage monitoring unit main body 14 arranged at the end of the wiring base material 15 in the overlapping direction X. FIG. 14B is a plan view of the wiring state in which the voltage monitoring unit main body 14 is disposed at the center of the overlapping direction X in the wiring base material 15.

More specifically, in the in-battery wiring module 11 of FIG. 14A, the voltage monitoring unit main body 14 is disposed at the end on the upper surface side of the wiring base material 15, and the voltage monitoring line 13 connected to the bus bar 12 is connected to the voltage monitoring line 13. It is connected to a wire connecting portion 41 provided on one side of the monitoring unit main body 14.
Thereby, the whole upper surface of the wiring base material 15 can be effectively utilized as the wiring space of the voltage monitoring line 13, and wiring can be performed efficiently.

  A connector connected to a voltage monitoring device (not shown) can be easily inserted into and connected to the other side of the voltage monitoring unit main body 14, and the in-battery wiring module 11 can be more easily attached to the battery module 72. .

  In the in-battery wiring module 11 shown in FIG. 14B, the voltage monitoring unit main body 14 is arranged at the center of the overlapping direction X in the wiring substrate 15, and the voltage monitoring line 13 connected to the bus bar 12b is connected to the voltage. It is connected to a wire connecting portion 41 provided on the four sides of the monitoring unit main body 14.

  Thereby, compared with the wiring state shown in FIG. 14A, the wiring state of the voltage monitoring lines 13 in FIG. 14B can be further simplified, and the interval between the voltage monitoring lines 13 is widened. It is possible to more reliably prevent the voltage monitoring lines 13 from being entangled or disconnected.

In the correspondence between the configuration of the present invention and the embodiment,
Electrodes consisting of positive and negative electrodes of the present invention correspond to the electrode post 73, positive electrode post 73a, and negative electrode post 73b of the embodiment,
Similarly,
The bus bar holding means corresponds to the rib portion 532 and the locking claw 533 in the bus bar holding portion 531.
The unit fixing means corresponds to the unit fixing portion 57,
The present invention is not limited to the configuration of the above-described embodiment, but can be applied based on the technical idea shown in the claims, and many embodiments can be obtained.

  In the above-described embodiment, the entire wiring substrate 15 is made of a flexible synthetic resin. For example, only the bus bar arrangement portion 53 for arranging the bus bar 12 is made of a flexible synthetic resin. May be.

  Further, the present invention is not limited to the connection structure in which the electrode post 73 of the battery cell 71 is inserted into the through hole 21 of the bus bar 12 and is fastened and fixed by the nut 16. The electrode post 73 of the cell 71 may be connected by other connection structures such as press fitting and fitting.

X ... Overlapping direction Y ... Crossing direction 11 ... In-battery wiring module 12 ... Bus bar 13 ... Voltage monitoring line 14 ... Voltage monitoring unit main body 15 ... Wiring substrate 19 ... Electric wire arrangement part 21 ... Through hole 52 ... Slit 53 ... Bus bar arrangement Portion 53c ... Open hole 531 ... Bus bar holding portion 55 ... Wiring guide portion 56 ... Wiring guide piece 57 ... Unit fixing 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 battery wiring module in which a plurality of bus bars connecting the positive electrode and the negative electrode between adjacent battery cells are arranged on a wiring substrate,
The wiring substrate is
Attached to the surface of the battery module having the electrode and composed of a sheet having flexibility and insulation,
Wherein provided along the superimposing direction on the surface of the sheets constituting the wiring substrate, and conductive wire arrangement unit in which to place the voltage monitoring line having one end connected to said bus bar,
In the crossing direction intersecting with the overlapping direction in the electric wire arrangement part, it is constituted by a bus bar arranging part that arranges a plurality of bus bars at a predetermined interval in the overlapping direction,
In the bus bar arrangement part,
An in-battery wiring module provided with bus bar holding means for detachably holding the bus bar. The in-battery wiring module according to claim 1, wherein in the bus bar arrangement portion, a slit that is cut out in the intersecting direction is provided between the adjacent bus bars. The in-battery wiring module according to claim 1, wherein the bus bar arrangement portion is arranged on both side portions in the intersecting direction with respect to the electric wire arrangement portion. In the wiring substrate,
The in-battery wiring module according to any one of claims 1 to 3, wherein a voltage monitoring unit main body for connecting the voltage monitoring line is mounted. In the wiring substrate,
The in-battery wiring module according to claim 4, further comprising unit fixing means for fixing the voltage monitoring unit main body. 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 in which a plurality of bus bars connecting the positive electrode and the negative electrode between the adjacent battery cells are arranged,
The wiring substrate is
Attached to the surface of the battery module having the electrode and composed of a sheet having flexibility and insulation,
Wherein provided along the superimposing direction on the surface of the sheets constituting the wiring substrate, and conductive wire arrangement unit in which to place the voltage monitoring line having one end connected to said bus bar,
In the crossing direction intersecting with the overlapping direction in the electric wire arrangement part, it is constituted by a bus bar arranging part that arranges a plurality of bus bars at a predetermined interval in the overlapping direction,
In the bus bar arrangement part,
A wiring substrate provided with bus bar holding means for holding the bus bar in a detachable manner. The battery module to which the wiring module in a battery as described in any one of Claims 1-5 was attached. 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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