JP2015043274A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack which reduces a cubic volume (achieves downsizing) and costs.SOLUTION: A pack battery includes: battery groups formed by laminating multiple square type batteries 2 with a rectangular shape in a plane view; a holder 8 including an outer periphery part 8c provided at outer peripheries of plane portions of the batteries 2 between the multiple batteries 2 and a substrate holding part 8b which holds a protection circuit board 6 provided on one end surface of the battery 2; a cap 4 which covers the substrate holding part 8b of the holder 8; and an exterior sheet 3 which covers the exposed batteries 2.

Description

  The present invention relates to a battery pack.

  In the battery pack shown in the following patent document, two flat rectangular batteries are stacked and stored in the upper and lower cases.

JP2005-174707

  In the above-described conventional technology, the volume is increased and the cost is increased by being accommodated in the case.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a battery pack that can be reduced in volume (downsized) and reduced in cost.

  The battery pack of the present invention includes a battery group in which a plurality of rectangular batteries having a rectangular shape in plan view are stacked, an outer peripheral portion provided on an outer periphery of a planar portion of the battery between the plurality of batteries, and one of the batteries. A holder including a substrate holding part that holds a protection circuit board provided on an end face, a cap that covers the substrate holding part of the holder, and an exterior sheet that covers an exposed battery except at least the cap. Further, the substrate holding part and the cap of the holder each have a convex part or a concave part, whereby the cap is held by the holder.

  In the present invention, since the cap covers the substrate holding portion of the holder, the protection circuit board and the like can be prevented from being damaged by impact or the like, and the conventional case can be obtained by covering the battery from which the exterior label is exposed. Compared to use, the volume can be reduced (downsizing) and the cost can be reduced.

1 is an exploded perspective view of a battery pack according to the present invention. FIG. 6 is a six-side view of the battery pack according to the present invention, where (a) is a front view (= plan view), (b) is a top view, (c) is a bottom view, (d) is a left side view, and (e). Is a right side view, and (f) is a rear view. It is a figure which shows the manufacture middle, (a) is a front view (= top view), (b) is a top view.

Hereinafter, the best mode for carrying out the present invention will be described using an example.
The embodiment used in the following description is an example used for easy understanding of the configuration, operation, and effect of the present invention, and the present invention is not limited to the essential features. Not limited.
The configuration of the battery pack 1 according to the present embodiment will be described with reference to FIGS. FIG. 1 is an exploded perspective view of a battery pack 1 according to the present embodiment, FIG. 2 is a six-face view showing the appearance of the battery pack 1 according to the present embodiment, and FIG. FIG.

As shown in FIG. 2, the battery pack 1 is covered with an exterior sheet 3. The exterior sheet 3 is a box-shaped body formed by bending and partially pasting a piece of electrically insulating paper, and is shown in an expanded state in FIG.
The exterior sheet 3 includes a lower surface portion 3c covering the lower surface of the battery 2 (core pack 10) in FIG. 1, side surface portions 3s and 3s covering the side surface, a bottom portion 3b covering the bottom surface of the battery 2 (core pack 10), and a core pack described later. The cap part 3p which covers the cap 4 part is comprised from the upper surface part 3u extended from this part and folded and stuck. Furthermore, it has sticking parts 3g and 3g that extend from the side face parts 3s and 3s and are pasted to the inner surface by a double-sided adhesive tape (not shown), as shown in FIG. 2 (f). It is affixed to. Instead of such an outer sheet, an outer sheet that covers the exposed battery 1 (core pack 10) except at least the cap 4 may be used.
Furthermore, the exterior sheet 3 may be a label having a sticky surface on the side in contact with the battery 2 (core pack 10). Instead of such an outer sheet, an outer sheet that covers the exposed battery 1 (core pack 10) except at least the cap 4 may be used.
In the battery pack 1, the exterior sheet 3 can prevent corrosion of the exterior body and electrical corrosion in the battery 2, and further improve appearance quality and strength. On the exterior sheet 3, a rating label 13 indicating the electric performance of the battery pack is attached.

Of the configuration of the battery pack 1, the core pack 10 will be described below.
The core pack 10 is a state (battery group) in which a plurality (two in this embodiment) of rectangular batteries 2 and 2 are stacked, and the lead portions 5l and 5l of the PTC elements 5 and 5 as safety elements are The upper lead plates 5u and 5u on the PTC element bodies 5h and 5h of the PTC elements 5 and 5 are connected to the convex electrodes 2t and 2t of the battery 2 through the through holes 8h and 8h of the holder 8, respectively. One end side lead plates 6ol and 6ol are connected. Here, the PTC elements 5 and 5 are held between the plurality of ribs 8 l of the substrate holding portion 8 b of the holder 8. Further, as shown in FIG. 1, the battery 2 is a lithium ion secondary battery having a rectangular shape in plan view and a flat rectangular shape, and the sealing plate 2a has a negative electrode terminal as a convex electrode 2t. Projected.
An insulating plate 9 is arranged between the lead portions 5l and 5l of the PTC elements 5 and 5 and the protection circuit board 6 to achieve insulation.

  On the other hand, the other end side lead plates 6tl and 6tl of the protective circuit board 6 are connected to the sealing plate 2a constituting the positive electrode of the battery 2 via the clad plates 13 and 13, respectively. With the above connection, the two batteries 2 are electrically connected in parallel.

The resin holder 8 includes a rectangular frame-shaped outer peripheral portion 8c provided on the outer periphery of the flat portion of the battery 2 between the batteries, and a protective circuit board provided on one end surface of the battery 2 (surface of the sealing plate 2a). 6 and a substrate holding part 8b for holding 6. The holder 8 and both the batteries 1 are fixed to both sides of one side of the outer peripheral portion 8 c of the holder 8 using double-sided tapes 12 and 12.
The core pack 10 is completed by installing the cap 4 in the middle of the production of the battery pack 1 (core pack 10) as shown in FIG.
The cap 4 made of resin has a box shape with one side open, and holes 4h, 4h, 4h, 4h, which are recesses provided on both side surfaces of the cap 4, (in FIG. 1, only one side is shown). (Not shown) by fitting convex portions 8t, 8t, 8t, 8t (only one side is shown in FIG. 1) provided on both side surfaces of the substrate holding portion 8b of the holder 8. The cap 4 covers and holds the substrate holding portion 8b. In this case, the cap 4 can be held by fitting with a convex portion inside the cap 4 and holes which are concave portions provided on both side surfaces of the substrate holding portion 8 b of the holder 8.
Thereby, the core pack 10 is completed, and the core pack 10 is covered with the exterior sheet 3 as described above, and the battery pack 1 is completed.

2 Battery 3 Exterior sheet 4 Cap 6 Protection circuit board 8 Holder 8c Outer peripheral part 8b Substrate holding part

Claims (2)

A battery group in which a plurality of rectangular batteries having a rectangular shape in plan view are stacked;
A holder comprising an outer peripheral portion provided on an outer periphery of a planar portion of the battery and a substrate holding portion for holding a protective circuit board provided on one end surface of the battery, between the plurality of batteries.
A cap covering the substrate holding portion of the holder;
An exterior sheet covering the exposed battery except at least the cap;
A battery pack comprising:   The battery pack according to claim 1, wherein the substrate holding portion and the cap of the holder each have a convex portion or a concave portion, whereby the cap is held by the holder.