JP2013078215A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably and properly attach a bus bar at low cost without causing backlash and secure good conduction state.SOLUTION: A battery pack includes: a battery pack case 1; a bus bar 15 disposed in the battery pack case 1; and an attachment member 25 which attaches the bus bar 15 to a wall surface in the battery pack case 1. The attachment member 25 is attached to a region which is offset from a conductive region of the bus bar 15.

Description

  The present invention relates to a battery pack.

  Conventionally, as a junction box that can be used for a battery pack, there is one in which two bus bars are fastened and fixed by bolts and nuts (see, for example, Patent Document 1).

  In addition, as a junction box that can be used for other battery packs, a vertical bus bar can be inserted into the bus bar housing part formed in the relay block, and can protrude from the inner surface of the bus bar housing part into a locking hole formed in the vertical bus bar. There is one in which a locking projection of a flexible piece is locked (see, for example, Patent Document 2).

JP 2007-28896 A JP 2002-186145 A

  However, in the invention described in the above-mentioned patent document, there is a problem in that the electrical resistance increases due to the formation of the through hole in the conductive portion, which adversely affects the conductive state.

  Further, in the invention described in Patent Document 1, since the bus bar is only fixed by the bolts and nuts of the conductive portion, there is a problem that if the bus bar is loosened, the bus bar is rattled.

  In the invention described in Patent Document 2, since it is a vertical bus bar, it is inserted into the relay block from the lower surface side, and when a part of the relay block comes into contact with the bottom wall, a flexible piece is inserted into the locking hole. It is necessary to lock the locking projection. For this reason, the processing precision of each component is requested | required and it causes a cost increase. Moreover, since the latching convex part is only latched in the latching hole, there exists a possibility that a latching state may be cancelled | released by an impact.

  An object of the present invention is to provide a battery pack capable of attaching a bus bar at a low cost, appropriately and reliably without causing rattling, and ensuring a good conduction state.

As a means for solving the above problems, the present invention provides:
Battery pack
A battery pack case,
A bus bar disposed in the battery pack case;
An attachment member for attaching the bus bar to a wall surface in the battery pack case;
With
The attachment member is configured to be attached to a region that is unevenly distributed from the conduction region of the bus bar.

  The mounting member may be a member that fixes the bus bar to the battery pack case, or may be a member that abuts only a part of the bus bar.

  With this configuration, the bus bar can be attached in an unevenly distributed region that is not directly related to the conduction region, and an appropriate support state can be obtained without adversely affecting the conduction in the bus bar.

The battery pack case includes a bottom wall surface and a side wall surface inside,
The bus bar includes a placement portion placed on a bottom wall surface of the battery pack case, and an upright portion standing up along a side wall surface of the battery pack case,
It is preferable that the attachment member has a shaft portion that extends in a direction perpendicular to the rising direction of the rising portion of the bus bar and is attached to the side wall surface of the battery pack case.

  With this configuration, the bus bar attached to the battery pack case is supported by the shaft portion of the attachment member that extends the upright portion in a direction orthogonal to the upright direction. Therefore, even if the position of the attachment member with respect to the battery pack case is shifted, it is in the axial direction and does not affect the state of supporting the standing portion of the bus bar. That is, it is possible to reliably prevent the bus bar from being lifted.

  The mounting member is preferably a clip whose shaft is engaged with a side wall surface of the battery pack case.

  With this configuration, the bus bar can be easily prevented from being lifted simply by engaging the shaft portion of the clip with the side wall of the box body.

  It is preferable that the attachment member is a tongue piece that protrudes from a side wall of the box main body and can come into contact with an edge of an upright portion of the bus bar.

  With this configuration, the bus bar can be prevented from being lifted without the need for a separate member, and the workability is excellent.

  According to the present invention, since the mounting of the bus bar to the battery pack case is performed by the mounting member attached to the unevenly distributed region that is not directly related to the conductive region of the bus bar, it is appropriate without adversely affecting the conductive property at the bus bar. Can be obtained.

It is a perspective view of the battery pack which concerns on this embodiment. It is a perspective view which shows the state which removed the battery pack cover from FIG. It is a perspective view which shows the state which removed internal components, such as a battery module and a junction box, from FIG. It is a perspective view of the battery module of FIG. It is a fragmentary perspective view which shows the state before bus bar mounting | wearing of the junction box of FIG. It is a fragmentary perspective view which shows the state in the middle of bus bar attachment to the junction box of FIG. It is a fragmentary perspective view which shows the state after completion of bus-bar mounting to the junction box of FIG.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings. In the following description, terms indicating specific directions and positions (for example, terms including “up”, “down”, “side”, “end”) are used as necessary. Is for facilitating understanding of the invention with reference to the drawings, and the technical scope of the present invention is not limited by the meaning of these terms. Further, the following description is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  1 and 2 show a battery pack according to the present embodiment. In this battery pack, a plurality of battery modules 2 and a junction box 3 (Junction Box) are accommodated in a battery pack case 1 and closed by a battery pack cover 4.

  As shown in FIG. 3, the battery pack case 1 has a substantially box shape with an open upper surface, and includes two partition walls 5 a and 5 b and a partition portion 6 in which an internal space is arranged at a predetermined interval. A junction box housing portion (JB housing portion 9) in which the junction box 3 is disposed is separated between the partition wall 5a and the second battery housing portions 8a and 8b.

  As shown in FIG. 4, the battery module 2 is a battery case 10 in which a plurality of battery cells 11 are accommodated at a predetermined interval and covered with a battery cover 12. The battery cells 11 are electrically connected in series. Each battery cell 11 is a non-aqueous electrolyte secondary battery such as a lithium ion battery, and although not shown, for example, the power generation element is housed in a battery container and sealed with a lid.

  The junction box 3 contains a control device, a sensor, a bus bar 15 and the like (not shown) in a box main body 13, and a wire harness (not shown) is connected to the bus bar 15. In the control device, the electric power from the battery cell 11 is supplied to the vehicle side on which the battery pack is mounted via the bus bar 15, the remaining electric power of the battery cell 11 is detected via a wire harness (not shown), It manages by communicating with the control device on the vehicle side.

  As shown in FIG. 5, the junction box 3 is formed with four rows of groove portions 14 extending in the longitudinal direction along the concave-convex shape on the bottom surface at one end, and each groove portion 14 has 4 grooves as shown in FIG. Two bus bars 15 (first bus bar 15a, second bus bar 15b, third bus bar 15c, and fourth bus bar 15d) are arranged.

  As shown in FIGS. 6 and 7, standing walls 16 are formed at predetermined intervals near the inside of one side wall of the junction box 3. Openings 17 are respectively formed on the bottom surface in the vicinity of the inner side of the upright wall 16 where the bus bars 15a, 15b, 15c, and 15d are disposed. A round crimp terminal 19 attached to one end of a wire harness (not shown) is arranged below each opening 17.

  Each bus bar 15a, 15b, 15c, 15d stands along the upright wall 16 from the mounting portion 20 disposed along the bottom surface of the junction box 3, and from one end side of the mounting portion 20. And an upright portion 21 corresponding to the unevenly distributed region.

  A cylindrical portion 22 is formed in the mounting portion 20, a bolt 23 inserted through the center hole of the round crimp terminal 19 is inserted, and a nut 24 is screwed into the bus bar 15 a, 15 b, 15 c, 15 d. And a wire harness (not shown) are electrically connected via a round crimp terminal 19. In the second bus bar 15 b and the third bus bar 15 c, the cylindrical portion 22 is formed at two locations, and each is electrically connected to the wire harness via the round crimp terminal 19.

  A through hole 21 a is formed in the standing portion 21 and is positioned in the vertical direction with respect to the standing wall 16 by a resin clip 25 which is an example of an attachment member inserted through the through hole 21 a. The resin clip 25 is provided with a flange portion 25b on one end side of the shaft portion 25a, and a resin pin 25c is press-fitted into the center of the flange portion 25b so that the shaft portion 25a can be expanded and fixed in the through hole 21a. Is. The resin clip 25 supports the bus bars 15a, 15b, 15c, and 15d with a shaft portion 25a that extends in a direction perpendicular to the direction in which the bus bars 15a, 15b, 15c, and 15d are about to float up. Therefore, the resin clip 25 does not easily fall off due to the rise of the bus bars 15a, 15b, 15c, and 15d, and the mounting state is improved.

  In the 2nd bus bar 15b and the 3rd bus bar 15c, the cylindrical part 22 is each formed in two places, and is electrically connected to the wire harness etc. which are not shown in figure. In the 2nd bus bar 15b, it connects with the cylindrical part 22 formed in the both ends side of the mounting part 20, respectively, and in the 3rd bus bar 15c, the cylindrical part formed in the standing part 21 side and the part extended to the side, respectively. 22 is connected.

  Thus, in each said bus-bar 15a, 15b, 15c, 15d, the standing part which is the area | region which was unevenly distributed from the conduction | electrical_connection area | region (For example, between the two cylindrical parts 22 in the 2nd bus bar 15b or the 3rd bus bar 15c). A resin clip 25, which is an example of an attachment member, is attached to 21. Accordingly, the bus bars 15a, 15b, 15c, and 15d can be attached to the standing wall 16 by the standing portion 21 that is not directly related to the conduction region, and the conduction at the bus bars 15a, 15b, 15c, and 15d is not adversely affected. An appropriate support state can be obtained.

  The battery pack cover 4 is a plate-like body that covers the upper opening of the battery pack case 1, and an intake portion 27 and an exhaust portion 28 are formed at diagonal positions, respectively.

  Next, a method for assembling the battery pack having the above configuration will be described. Here, only the method of assembling the bus bars 15a, 15b, 15c, and 15d in the junction box 3, which is a characteristic part of the present invention, will be described.

  In the junction box 3, the placement portions 20 of the bus bars 15a, 15b, 15c, and 15d are placed in the groove portions 14 formed on the bottom surface. At this time, the upright portions 21 of the bus bars 15a, 15b, 15c, and 15d are arranged along the upright wall 16. Thereby, each bus-bar 15a, 15b, 15c, 15d is positioned.

  In addition, each bus bar 15a, 15b, 15c, 15d has a shaft portion 25a of a resin clip 25 inserted into a through hole 16a formed in the standing wall 16 of the junction box 3 through a through hole 21a formed in the standing portion 21. The resin clip 25 is positioned by press-fitting the resin pin 25c. Thereby, each bus-bar 15a, 15b, 15c, 15d is prevented by the axial part 25a of the resin clip 25 from rising upward. In this case, the rising direction of the bus bar 15 and the falling direction of the resin clip 25 are orthogonal to each other. For this reason, even if the bus bar 15 tries to float up, the direction does not coincide with the direction in which the resin clip 25 falls off, and the positioning of the bus bar 15 by the resin clip 25 can be maintained in a good state.

  Thereafter, the round crimp terminal 19 integrated with a wire harness (not shown) is connected to the cylindrical portion 22 of each bus bar 15a, 15b, 15c, 15d by the bolt 23 and the nut 24.

  In addition, this invention is not limited to the structure described in the said embodiment, A various change is possible.

  For example, in the embodiment, the bus bar 15 is fixed by the resin clip 25, but may be fixed by other means such as screwing. In short, any attachment member having a configuration in which the shaft portion 25a is provided in a direction orthogonal to the lifting direction of the bus bar 15 may be used.

  Further, the attachment member does not necessarily have to be a separate body from the junction box 3, and can be constituted by, for example, a protrusion protruding from the standing wall 16. In this case, the protrusion or the like does not necessarily have to be inserted into the through hole 21 a of the bus bar 15, and may be capable of contacting the upper end of the standing portion 21 of the bus bar 15, for example.

  Further, the mounting member prevents the bus bar 15 in the box main body 13 accommodated in the junction box 3 from being lifted up, but the bus bar provided at other positions in the battery pack case 1 is also lifted in the same manner. It is possible to prevent. For example, even with a bus bar that connects battery cells 11 or a bus bar that connects battery modules 2, the mounting member having the above-described configuration can be employed.

DESCRIPTION OF SYMBOLS 1 ... Battery pack case 2 ... Battery module 3 ... Junction box 4 ... Battery pack cover 5a, 5b ... Partition wall 6 ... Partition part 7 ... 1st battery accommodating part 8 ... 2nd battery accommodating part 9 ... JB accommodating part 10 ... Battery Case 11 ... Battery cell 12 ... Battery cover 13 ... Box body 14 ... Groove 15 ... Bus bar 15a ... First bus bar 15b ... Second bus bar 15c ... Third bus bar 15d ... Fourth bus bar 16 ... Standing wall 17 ... Opening 18 ... Wire Harness 19 ... Round crimp terminal 20 ... Placement part 21 ... Standing part 21a ... Through hole 22 ... Cylinder part 23 ... Bolt 24 ... Nut 25 ... Resin clip 25a ... Shaft part 27 ... Intake part 28 ... Exhaust part

Claims (3)

A battery pack case,
A bus bar disposed in the battery pack case;
An attachment member for attaching the bus bar to a wall surface in the battery pack case;
With
The battery pack, wherein the attachment member is attached to a region that is unevenly distributed from a conduction region of the bus bar. The battery pack case includes a bottom wall surface and a side wall surface inside,
The bus bar includes a placement portion placed on a bottom wall surface of the battery pack case, and an upright portion standing up along a side wall surface of the battery pack case,
2. The battery pack according to claim 1, wherein the attachment member includes a shaft portion that extends in a direction orthogonal to an upright direction of the upright portion of the bus bar and is attached to a side wall surface of the battery pack case.   The battery pack according to claim 2, wherein the attachment member is a clip whose shaft is engaged with a side wall surface of the battery pack case.