JP2013078232A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack including bus bars which enable electric connection to be made between internal electronic components and with exterior devices despite a simple and inexpensive structure.SOLUTION: A battery pack includes: a battery pack case 1; and bus bars 34 to 37 for electrically connecting electronic components, which are disposed in the battery pack case 1, with each other. The battery pack case 1 has an opening and parts of the bus bars 34 to 37 are disposed at the opening. Further, parts of the bus bars 34 to 37 may be electrically connected with the exterior through the opening.

Description

  The present invention relates to a battery pack.

  Conventionally, as a junction box used for a battery pack or the like, one having a bus bar for electrically connecting an internal electronic component to the outside is known (see, for example, Patent Documents 1 to 3).

  However, in the conventional junction box, the internal electronic components are mounted on the circuit board, and the bus bar is electrically connected to the circuit board. That is, the internal electronic components depend on the wiring of the circuit board, and the bus bar itself is not configured to electrically connect the internal electronic components.

  In particular, in the junction box described in Patent Document 1, a bus bar for electrical connection to a circuit board and a bus bar for electrical connection to the outside are configured as separate members, and both are joined. For this reason, there is a problem that the number of parts increases, resulting in an increase in cost.

JP 2006-325355 A JP 2007-181279 A JP 2009-153318 A

  An object of the present invention is to provide a battery pack provided with a bus bar capable of performing electrical connection between internal electronic components and external connection in spite of a simple and inexpensive configuration. To do.

As a means for solving the above problems, the present invention provides:
A battery pack case,
A bus bar for electrically connecting electronic components arranged in the battery pack case;
A battery pack comprising:
The battery pack case, or the box body housed in the battery pack case has an opening,
A part of the bus bar is disposed in the opening and can be electrically connected to the outside through the opening.

  With this configuration, even with a single bus bar, it is possible to perform electrical connection between internal electronic components and external connection with a simple configuration that simply forms an opening in the battery pack case. It becomes.

The battery pack case or the box body includes a first surface on which the opening is formed, and a second surface on which an electronic component that electrically connects the bus bar is placed,
Preferably, the second surface is constituted by a bottom surface of a recess formed in the first surface by projecting a part of the battery pack case or the box body outward.

  With this configuration, an opening for electrical connection to the outside is formed on the first surface, so that a battery pack case or box is formed by a recess formed by projecting a part of the battery pack case or box body outward. A work space for electrical connection can be secured outside the main body. Further, by placing the electronic component on the second surface, an increase in the height dimension can be suppressed.

  It is preferable that the bus bar includes a bent portion at a middle portion between a position electrically connected to the outside and a position electrically connected to the electronic component.

  With this configuration, a space that facilitates electrical connection with other electronic components can be provided at a position corresponding to the bent portion.

  It is preferable that the battery pack case or the box body includes a convex portion in the vicinity of a position where the battery pack case or the box body is electrically connected to the outside of the bus bar.

  With this configuration, even when a plurality of bus bars are provided, the bus bars can be insulated from each other only by forming the protrusions.

The battery pack case or the box body includes other electronic components placed on the first surface,
In the other electronic component, it is preferable that a connector for electrically connecting the wire harness is formed on the concave portion side.

  With this configuration, the electrical connection work of the wire harness to the connector of another electronic component can be smoothly performed using the space formed by the recess.

  According to the present invention, even with a single bus bar, the internal electronic components can be electrically connected to each other, and also electrically connected to the outside through the opening formed in the battery pack case or the box body. Can do.

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. FIG. 3 is an exploded perspective view of the battery pack case and the battery pack case of FIG. 2. It is a perspective view of the battery module of FIG. FIG. 4 is a partial perspective view showing one end side of the battery pack case of FIG. 3. 2 is an exploded perspective view showing the junction box and the bus bar. It is a perspective view which shows the state which assembled | attached the bus bar from FIG. FIG. 8 is an exploded perspective view of the substrate and the second cover with the first cover attached from FIG. 7. It is a perspective view which shows the state seen from the bottom face side which shows the connection state of the round crimp terminal to the bus bar of FIG. It is a perspective view which shows the bus bar 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 9 (hereinafter referred to as a JB housing portion) in which the junction box 3 is disposed between the partition walls 5a and 5b, which is separated into a portion 7 and second battery housing portions 8a and 8b. It has become.

  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.

  As shown in FIG. 7, the junction box 3 includes a relay (not shown), a leakage sensor 16, bus bars 34 to 37, etc. in addition to a control device (CPU mounted on a circuit board) not shown in the box body 13. Is housed.

  As shown in FIG. 3, a rectangular hole 18 is formed in one end face of the JB housing portion 9, and a harness plate 19 is attached thereto. Four wire harnesses 20 are connected to the harness plate 19. A round crimp terminal 21 is attached to the tip of each wire harness 20. Each round crimp terminal 21 is electrically connected to each bus bar 17 described later. Further, a communication hole 23 that is closed by a closing plate 22 is formed on the bottom surface at one end side of the JB housing portion 9.

  As shown in FIG. 5, the box body 13 includes a first bottom surface 24 on which a control device and a relay are placed, and a second bottom surface 25 positioned above the first bottom surface 24. That is, the bottom surface of the recess formed on the second bottom surface 25 constitutes the first bottom surface 24. The box body 13 includes a third bottom surface 26 and a fourth bottom surface 27 on the side of the first bottom surface 24. The third bottom surface 26 is formed at a position one step higher than the first bottom surface 24, and the fourth bottom surface 27 is formed at a position between the second bottom surface 25 and the third bottom surface 26.

  The first bottom surface 24 and the second bottom surface 25 are each formed with four rows of groove portions (first groove portion 28, second groove portion 29, third groove portion 30, and fourth groove portion 31) extending in the longitudinal direction. The first groove 28 includes an upper groove 28 a formed on the second bottom surface 25 and a lower groove 28 b formed on the first bottom surface 24. The second groove portion 29 is the same as the first groove portion 28, but the upper groove 29a formed in the second bottom surface 25 has an intermediate portion extending laterally.

  As shown in FIG. 5, each of the grooves 28 to 31 has openings 32a, 32b, 32c, and 32d formed on the bottom surface on one end side. On the lower side of each opening 32a, 32b, 32c, 32d, a round crimp terminal 21 attached to one end of the wire harness 20 is arranged. An insulating wall 33 is formed in the vicinity of the openings 32a, 32b, 32c, and 32d. The insulating wall 33 includes a first wall portion 33 a located on one end side of the second groove portion 29 and the third groove portion 30. From both ends of the first wall portion 33a, the second wall portion 33b and the third wall portion 33c extend in the perpendicular direction, that is, along the second groove portion 29 and the third groove portion 30 toward the other end side. From the second wall portion 33b and the third wall portion 33c, a fourth wall portion 33d and a fifth wall portion 33e extend to the inner surface of the box body 13 in directions orthogonal to each other. The fourth wall portion 33d and the fifth wall portion 33e are formed lower than the second wall portion 33b and the third wall portion 33c, and one end of a first bus bar 34 and a fourth bus bar 37, which will be described later, is formed at the upper end edge thereof. Each part is located.

  In addition, as shown in FIG. 6, four bus bars (a first bus bar 34, a second bus bar 35, a third bus bar 36, and a fourth bus bar 37) are arranged in each of the groove portions 28 to 31.

  As shown in FIG. 10, each of the bus bars 34 to 37 includes a placement portion 38 that is disposed along the bottom surface of the junction box 3, and a standing portion 39 that rises from one end side of the placement portion 38.

  Although the cylinder part 40 is formed in the mounting part 38, although not shown in figure, the volt | bolt penetrated by the center hole of the said round type crimp terminal 21 is penetrated, and a bus bar 34-37 and a wire are screwed together. The harness 20 is electrically connected to each other via a round crimp terminal 21.

  The first bus bar 34 includes a first electrical connection portion 34 a that extends at a right angle from the standing portion 39 and is electrically connected to the fourth bus bar 37. The first bus bar 34 is disposed in the recess of the box body 13 on the other end side of the placement portion 38. The bent portion 34b is provided. The bent part 34b includes a bottom part 34b1 located in the lower groove and side parts (first side part 34b2 and second side part 34b3) protruding upward from both ends thereof. A second electrical connection portion 34c extends at a right angle from the upper end of the second side portion 34b3 and is connected to one electrode of the relay.

  The second bus bar 35 has substantially the same configuration as the first bus bar 34, but the shape of the mounting portion 38 is slightly different, and has a third electrical connection portion 35 d that protrudes laterally. The third bus bar 36 also has a similar third electrical connection portion 36d. And the 2nd electrical connection part 35c of the 2nd bus-bar 35 is electrically connected to one electrode of a relay. The cylindrical portions 35 d and 36 d of the second bus bar 35 and the third bus bar 36 are electrically connected to each other by the auxiliary bus bar 43.

  The bus bars 34 to 37 and the leakage sensor 16 are covered with a first cover 44 attached to one end side of the box body 13. A substrate 45 is disposed on the upper surface of the first cover 44, and the substrate 45 is covered with a second cover 46 attached to the first cover 44.

  A guide wall 26 a is formed around the third bottom surface 26 so that the relay can be placed and positioned. The relay placed on the third bottom surface 26 is fixed to the box body 13 with screws. A guide wall 26a is also formed on the fourth bottom surface 27 so that the leakage sensor 16 can be placed and positioned and then fixed with screws.

  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 a bus bar (not shown), and 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.

  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 47 and an exhaust portion 48 are formed at diagonal positions, respectively. The intake portion 47 has a rectangular opening, is connected to an air conditioner in the vehicle, and is supplied with cold air.

  Next, a method for assembling the junction box 3 having the above configuration will be described.

  First, as shown in FIG. 6, a circuit board on which various electronic components are mounted, a relay, a leakage sensor 16, and the like are screwed into the box body 13. Further, the bus bars 34 to 37 are arranged in the groove portions of the box body 13, respectively. As shown in FIG. 7, each of the bus bars 34 to 37 is mounted by fixing the standing portion 39 to the insulating wall 33 with a resin clip or the like. In this case, the mounting direction is stable because the mounting direction of the resin clip or the like is perpendicular to the direction in which the bus bars 34 to 37 drop from the box body 13.

  Then, the first electrical connection portion 34 a of the first bus bar 34 and the first electrical connection portion 37 a of the fourth bus bar 37 are electrically connected by the wire harness 49. Further, the second electrical connection portion 34c of the first bus bar 34 is connected to one electrode of the relay, and the second electrical connection portion 35c of the second bus bar 35 is connected to one electrode of the other relay.

  As shown in FIG. 9, the round crimp terminals 21 connected to one end of each wire harness 20 are connected to the tube portions 40 of the bus bars 34 to 37, respectively. These connections are made from the bottom surface side of the box body 13 through the openings 32a, 32b, 32c, and 32d formed in the box body 13. The connection state between the cylindrical portion 40 of each bus bar 34 to 37 and each round crimp terminal 21 is communicated from the bottom side of the battery pack case 1 after the box body 13 is accommodated in the JB accommodating portion 9 of the battery pack case 1. It can be visually recognized through the hole 23 (may be connected in this state). Further, the second bus bar 35 and the third bus bar 36 are electrically connected to each other by the auxiliary bus bar 43 via the respective cylinder portions 35c and 36c.

  Subsequently, a cable connector is connected to the connector of the leakage sensor 16. In this case, since the first bottom surface 24 is formed at a position lower than the side surface of the fourth bottom surface 27 to which the leakage sensor 16 is attached, a sufficiently wide working space is secured. For this reason, the cable connection work can be easily performed.

  Thereafter, the earth leakage sensor 16 and the bus bars 34 to 37 are covered with the first cover 44, the substrate 45 is attached to the first cover 44, and the second cover 46 is attached to cover the substrate 45.

  In the junction box 3 assembled in this way, one end sides of the bus bars 34 to 37 are insulated from each other by the insulating wall 33. Further, by preparing four types of bus bars 34 to 37 and arranging them in the respective groove portions formed in the box main body 13, electrical connection between the respective electronic components can be easily achieved. Moreover, each of the four types of bus bars can be electrically connected to the outside through the openings 32a, 32b, 32c, and 32d formed in the box body 13. Therefore, the structure can be simplified and manufactured at low cost.

  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, four types of bus bars 34 to 37 are used, but the shape can be freely changed according to the difference in the layout of electronic components provided in the junction box. The point is that the bus bar can be attached only to the battery pack case 13 from above and can be electrically connected to the outside through the openings 32a, 32b, 32c, 32d formed in the box body 13. That's fine.

  In the above embodiment, the external connection is made through the openings 32 a, 32 b, 32 c, and 32 d formed in the box main body 13, but the electric pack case 1 itself is opened instead of the box main body 13. A portion may be formed, and electrical connection with the outside may be achieved through a part of the bus bar disposed in the opening. Further, the first bottom surface 24, the second bottom surface 25, the insulating wall 33 and the like formed on the box body 13 can be formed on the electric pack case 1.

  The junction box 3 according to the present invention can be employed in various batteries such as a lead storage battery in addition to a lithium ion battery.

DESCRIPTION OF SYMBOLS 1 ... Battery pack case 2 ... Battery module 3 ... Junction box 4 ... Battery pack cover 5 ... 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 16 ... Electrical leakage sensor 17 ... Bus bar 18 ... Rectangle hole 19 ... Harness plate 20 ... Wire harness 21 ... Round crimp terminal 22 ... Closing plate 23 ... Communication hole 24 ... First bottom surface ( First side)
25. Second bottom surface (second surface)
26 ... 3rd bottom surface 27 ... 4th bottom surface 28 ... 1st groove part 29 ... 2nd groove part 30 ... 3rd groove part 31 ... 4th groove part 32a, 32b, 32c, 32d ... Opening part 33 ... Insulating wall (convex part)
34 ... 1st bus bar 35 ... 2nd bus bar 36 ... 3rd bus bar 37 ... 4th bus bar 38 ... Mounting part 39 ... Standing part 40 ... Tube part 41 ... Bolt 42 ... Nut 43 ... Auxiliary bus bar 44 ... 1st cover 45 ... Substrate 46 ... second cover 47 ... intake part 48 ... exhaust part 49 ... wire harness

Claims (5)

A battery pack case,
A bus bar for electrically connecting electronic components arranged in the battery pack case;
A battery pack comprising:
The battery pack case, or the box body housed in the battery pack case has an opening,
A part of the bus bar is disposed in the opening, and is electrically connectable to the outside through the opening. The battery pack case or the box body includes a first surface on which the opening is formed, and a second surface on which an electronic component that electrically connects the bus bar is placed,
The said 2nd surface was comprised by the bottom face of the recessed part formed in the said 1st surface by making a part of the said battery pack case or the said box main body protrude outward. Battery pack.   The battery pack according to claim 2, wherein the bus bar includes a bent portion at an intermediate portion between a position where the bus bar is electrically connected to the outside and a position where the bus bar is electrically connected to the electronic component.   4. The battery pack according to claim 1, wherein the battery pack case or the box body includes a convex portion in the vicinity of a position where the battery pack case or the box body is electrically connected to the outside of the bus bar. 5. The battery pack case or the box body includes other electronic components placed on the first surface,
5. The battery pack according to claim 1, wherein a connector for electrically connecting a wire harness is formed on the concave portion side of the other electronic component.