JP2013077500A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly make connection by using bus bars and wire harnesses even when battery modules are arranged in three or more lines.SOLUTION: A battery pack includes: a battery pack case 1; multiple battery modules 2, each of which is formed by electrically connecting multiple battery cells 10 and is disposed in the battery pack case 1; multiple bus bars 12 for electrically connecting the respective battery modules 2 in series; and bus bar covers 13 covering the bus bars 12. The bus bar covers 13 are respectively fixed to the battery modules 2.

Description

  The present invention relates to a battery pack.

  Conventionally, a battery pack in which a plurality of battery modules obtained by electrically connecting a plurality of single cells (battery cells) into modules is housed in a case is known (for example, see Patent Document 1).

JP 2011-76936 A

  However, the conventional battery pack includes a bus bar arranged between battery modules in which signal lines connecting each battery and the control device are arranged in two rows. For this reason, when a battery module is arranged in parallel by 3 or more rows, it cannot respond appropriately. That is, if the battery modules are arranged in three or more rows, it is necessary to make electrical connection with the battery module at the most distant position using a bus bar, a wire harness or the like, but the conventional configuration can cope with this. difficult.

  In addition, since the bus bar is only fixed to the positive electrode terminal and the negative electrode terminal, when the battery pack is used for in-vehicle use, vibration is transmitted to the bus bar and the fixing part between the bus bar and each terminal is loosened. Or may come off in some cases.

  Therefore, an object of the present invention is to provide a battery pack that can be appropriately connected by a bus bar or a wire harness, has a high degree of design freedom, and is excellent in vibration resistance.

As a means for solving the above problems, the present invention provides:
Battery pack
A battery pack case,
A plurality of battery modules formed by electrically connecting a plurality of battery cells, and disposed in the battery pack case,
A bus bar for electrically connecting each of the battery modules;
A bus bar cover for fixing the bus bar;
And a configuration with
The bus bar cover is fixed to the battery module.

  With this configuration, even a battery module far away can be easily electrically connected with the bus bar. In addition, since the bus bar is covered by the bus bar cover, it is possible to suppress the influence on other components when energizing through the bus bar. Further, since the bus bar is fixed to the battery module via the bus bar cover, the bus bar is excellent in vibration resistance, and the connection state of the bus bar does not become inappropriate due to the influence of vibration or the like.

  The bus bar cover is preferably fixed in the vicinity of the electrode fixing portion of the battery module.

  With this configuration, it is possible to stabilize the mounting state of the bus bar cover and the bus bar guided by the bus bar cover.

The bus bar cover is formed with a through hole,
It is preferable to further include a fixing member that is inserted through the through hole of the bus bar cover and fixed to a part of the battery module.

  With this configuration, the bus bar cover can be easily attached to the battery module only by fixing the fixing member to a part of the battery module.

A wire harness connected to any one of the battery modules,
It is preferable that the fixing member has a holding portion that holds the wire harness.

  With this configuration, not only can the bus bar cover be attached with the clip, but also the wire harness can be held, and assemblability can be improved.

In addition, a wire harness connected to any one of the battery modules is further provided,
The bus bar cover may include a holding member that holds the wire harness.

The battery module includes a battery cover,
The battery cover and the bus bar cover have through holes communicating with each other,
It is preferable that the clip can be fitted and attached to both the through holes.

  With this configuration, the bus bar cover can be easily attached to the battery case simply by positioning the bus bar cover with respect to the battery case and inserting the clip into and engaging with both through holes.

  According to the present invention, since the bus bar cover is provided and fixed to the battery module, not only the insulation of the bus bar can be improved, but also the mounting state of the bus bar and the bus bar cover can be stabilized, and the vibration resistance is improved. It becomes possible to make it high. Moreover, the connection by a bus bar and a wire harness can be performed appropriately, and the freedom degree of design is excellent.

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 an expansion perspective view of a pair of battery module of FIG. FIG. 6 is an exploded perspective view of the bus bar and the bus bar cover of FIG. 5. FIG. 6 is an enlarged perspective view of a fixed portion of the bus bar cover of FIG. 5. It is an expansion perspective view of the fixed part of the bus-bar cover which concerns on other embodiment. It is an expansion perspective view of the fixing clip of FIG. It is an expansion perspective view of the fixed part of the bus-bar cover which concerns on other embodiment.

  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 upper surface opened, and two partition walls 5 a and 5 b in which an internal space is arranged at a predetermined interval, and a partition portion 6, and includes a first battery. The housing portion 7 and the second battery housing portions 8a and 8b are divided into three, and between the both partition walls 5 is a JB housing portion 9 in which the junction box 3 is disposed.

  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.

  In the battery module 2, fixed electrode portions 2 a composed of a positive electrode and a negative electrode are exposed at both end portions of the side edge. Here, all the battery modules 2 have the same structure, and are arranged in different directions when placed in the battery case 10.

The battery modules are electrically connected by the bus bar 13.
As shown in FIG. 5, the bus bar 13 is a plate made of a conductive metal material (for example, copper or copper alloy). The bus bar 13 is formed with through holes at both ends, and through each through hole, the positive electrode fixed electrode portion 2a of one battery module 2 and the negative electrode fixed electrode portion 2a of another battery module 2 are inserted, respectively, and a nut The fixed electrode portions are electrically connected to each other by screwing 2b. The battery modules 2 housed in the battery case 10 are all connected in series by the bus bar 13.

The bus bar 13 is covered with a synthetic resin bus bar cover 14.
As shown in FIG. 6, the bus bar cover 14 includes an upper cover 14A and a lower cover 14B, and a groove in which the bus bar 13 is disposed is formed in the upper cover 14A. The upper cover 14A and the lower cover 14B can be attached to the bus bar 13 by heat welding. As shown in FIG. 7, the bus bar 13 to which the bus bar cover 14 is mounted is inserted into the through hole formed in the bus bar cover 14, and the screw 14 a is inserted into the through hole 12 a formed in the battery cover 12. It is fixed by being screwed onto.

  A holding member 15 is integrated with the bus bar cover 14 in the vicinity of the position fixed by the screw 14a. The holding member 15 is made of a synthetic resin material and has an annular harness holding portion 17 for holding the wire harness 18 at the upper end portion of the shaft portion 16 protruding from the bus bar cover 14.

  The wire harness 18 serves as a signal line that connects each battery cell 11 and a control device of the junction box 3 described later.

  The junction box 3 contains a control device and the like, and the bus bar 13 and the wire harness 18 are connected to each other. 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 13, the remaining electric power of the battery cell 11 is detected via the wire harness 18, and the vehicle side It manages by communicating with the control device.

  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 19 and an exhaust portion 20 are formed at diagonal positions, respectively.

  Next, a method for assembling the battery pack having the above configuration will be described. Here, the assembly work of the bus bar cover 14 and the wire harness 18 which is a characteristic part of the present invention will be mainly described.

  The battery module 11 is formed by housing a plurality of battery cells 11 in the battery case 10, electrically connecting the batteries in series, and then covering with a battery cover 12. A plurality of battery modules 2 formed in this way are accommodated in the battery pack case 1 in an aligned state. At this time, the battery modules are laid out so that adjacent battery modules have opposite polarities. As a result, the distance between the positive electrode and the negative electrode of the fixed electrode portion 2a can be minimized between the adjacent battery modules 2, and it is possible to connect with a short bus bar (not shown).

  Further, the battery modules whose fixed electrode portions 2a are separated from each other are connected by a long bus bar 13 shown in FIG. A bus bar cover 14 is attached to the bus bar 13 in advance. A holding member 15 is integrated with the bus bar cover 14. The wire harness 18 is held in the harness holding portion 17 of the holding member 15.

  Then, the positive fixed electrode portion 2 a protruding from one battery module 2 and the negative fixed electrode portion 2 a protruding from the other battery module 2 are inserted through through holes formed at both ends of the bus bar 13. And the electrical connection by the bus-bar 13 is completed by screwing the nut 2b in each fixed electrode part 2a.

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

  For example, in the above-described embodiment, the wire harness 18 is held by the holding member 17, but instead of this, the fixing member 21 shown in FIG. 8 can be used. Similar to the holding member 15, the fixing member 21 is capable of holding a wire harness made of a synthetic resin material and also has the function of the screw 14 a. That is, as shown in FIG. 9, the fixing member 21 includes a shaft portion 22 that can be screwed or engaged with a through hole formed in the battery cover 12, and a circular flange portion 23 provided at an intermediate portion of the shaft portion 22. And an annular harness holding portion 24 provided at the upper end portion of the shaft portion 22. The fixing member 21 is inserted into the through hole of the bus bar cover 14 while the wire harness 18 is inserted into the harness holding part 24, and the shaft part 23 is engaged with the through hole of the battery cover 12. It is attached. Thereby, holding | maintenance of the wire harness 18 and fixation to the battery cover 12 of the fixing member 21 and the bus-bar cover 14 can be performed.

  Moreover, in the said embodiment, although the harness holding | maintenance part 18 of the holding member 15 and the harness holding | maintenance part 24 of the fixing member 21 were made into the cyclic | annular form, it winds according to the outer diameter dimension of the wire harness 18 like a binding band. It can also be set as the structure which can change an internal diameter dimension. Further, as long as the wire harness 18 can be held, other various forms such as a substantially U-shape can be adopted.

  Further, in the embodiment, the holding member 15 or the fixing member 21 is provided on the bus bar cover 14, but the bus bar cover 14 is screwed to the battery cover 12 as shown in FIG. It can also be configured to be held at the location.

DESCRIPTION OF SYMBOLS 1 ... Battery pack case 2 ... Battery module 2a ... Fixed electrode part 2b ... Nut 3 ... Junction box 4 ... Battery pack cover 5a, 5b ... Partition wall 6 ... Partition part 7 ... 1st battery accommodating part 8 ... 2nd battery accommodating part DESCRIPTION OF SYMBOLS 9 ... JB accommodating part 10 ... Battery case 11 ... Battery cell 12 ... Battery cover 12a ... Through-hole 13 ... Bus bar 14 ... Bus bar cover 14a ... Screw 15 ... Holding member 16 ... Shaft part 17 ... Harness holding part 18 ... Wire harness 19 ... Intake part 20 ... exhaust part 21 ... fixing member 22 ... shaft part 23 ... collar part 24 ... harness holding part

Claims (6)

A battery pack case,
A plurality of battery modules formed by electrically connecting a plurality of battery cells, and disposed in the battery pack case,
A bus bar for electrically connecting each of the battery modules;
A bus bar cover for fixing the bus bar;
With
The battery pack, wherein the bus bar cover is fixed to the battery module.   The battery pack according to claim 1, wherein the bus bar cover is fixed in the vicinity of an electrode fixing portion of the battery module. The bus bar cover is formed with a through hole,
The battery pack according to claim 1, further comprising a fixing member that is inserted through the through hole of the bus bar cover and is fixed to a part of the battery module. A wire harness connected to any one of the battery modules,
The battery pack according to claim 3, wherein the fixing member includes a holding portion that holds the wire harness. A wire harness connected to any one of the battery modules,
The battery pack according to claim 1, wherein the bus bar cover includes a holding member that holds the wire harness. The battery module includes a battery cover,
The battery cover and the bus bar cover have through holes communicating with each other,
5. The battery pack according to claim 3, wherein the fixing member can be fitted and attached to both the through holes.