JPH0822812A - Battery pack - Google Patents

Abstract

PURPOSE:To provide a battery pack which is space-saving, inexpensive, and free of backlash in a group of batteries. CONSTITUTION:A group of batteries 1 consisting of a plurality of batteries, a flexible printed board 3, and a both-sided tape 4 are accommodated in cases 5 and 6. A group f batteries 1 and the case are fixed with each other by the both-sided tape 4 through an opening 7 or a cut 9 made in the flexible printed board. As a result, the fixation can be made with one sheet of both-sized tape by stabilizing a group of batteries and the case. It becomes possible to increase the fall strength by removing the backlash, and the quality can be improved. Furthermore, this enables the constitution of the space-saving, high-productivity, and inexpensive battery pack.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack containing a plurality of batteries.

[0002]

2. Description of the Related Art Conventionally, a general battery pack uses lead wires or the like to fix a battery group and a case with double-sided tape or the like. In recent years, flexible printed circuit boards (hereinafter referred to as "flexible circuit boards") have come to be used because of the need for space saving of battery packs and improvement of productivity.

As a fixing method in a battery pack using this flexible substrate, there is one as shown in FIGS.

In FIG. 7, a flexible substrate 3 is attached on a battery group 1 in which a plurality of batteries are connected by a lead plate 2, and the flexible substrate 3 is inserted between an upper case 5 and a lower case 6 without being fixed with a double-sided tape. This is the case when fixing.

FIG. 8 shows a case where a flexible substrate 3 is mounted on a battery group 1 in which a plurality of batteries are connected by a lead plate 2, and a double-sided tape 4 is stuck on the flexible substrate 3 and fixed to an upper case 5.

In FIG. 9, a double-sided tape 4 is attached on a battery group 1 in which a plurality of batteries are connected by a lead plate 2, a flexible substrate 3 is attached and fixed thereon, and an upper case 5 and a lower case 6 are attached.
This is the case when it is put between and.

In FIG. 10, a double-sided tape 4 is attached on a battery group 1 in which a plurality of batteries are connected by a lead plate 2, a flexible substrate 3 is attached thereon, and then another double-sided tape 4 is attached thereon. Then, the case is fixed to the upper case 5.

[0008]

However, in the structure shown in FIGS. 7 to 9, the battery group and the case are not sufficiently fixed to each other, so that the battery group becomes unstable, and the battery group rattles and produces an abnormal noise. Or, it causes a drop in strength when dropped. In addition, when the flexible substrate is attached to the battery group, the battery group and the flexible substrate are not fixed, which makes attachment difficult.
When double-sided tape is used on both sides of the flexible substrate in order to solve such a problem as shown in FIG. 10, problems such as increased cost, reduced productivity, and increased space occur.

The present invention solves the above problems of the prior art,
It is an object of the present invention to provide a space-saving, inexpensive battery pack that does not rattle the battery group.

[0010]

To achieve the above object, the battery pack of the present invention is a battery pack in which a battery group consisting of a plurality of batteries, a flexible substrate, and a double-sided tape are housed in a case. In the above, the battery group and the case are fixed by the double-sided tape through an opening or a notch formed in the flexible substrate.

[0011]

The double-sided tape attached to the case is attached not only to the flexible substrate but also to the battery group through the opening or notch provided in the flexible substrate. All pack components are fixed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIGS. 1 and 2 show an example of a battery pack using a flexible substrate having an opening according to the present invention. Taking the case of FIG. 1 as an example, first, a battery group (cylindrical type) 1 in which a plurality of batteries are connected by a lead plate 2 is housed in a lower case 6. When the flexible substrate 3 is arranged on the battery group 1 and the double-sided tape 4 is attached from above the flexible substrate 3,
The double-sided tape 4 is also attached to the battery group 1 through the opening 7 (for example, when a flexible substrate as shown in FIG. 5 is used) provided in the flexible substrate 3. When the upper case 5 is fitted onto the lower case 6 from above the double-sided tape 4, the back surface of the surface of the double-sided tape 4 which is adhered to the flexible substrate 3 is adhered to the upper case 5. Then, the upper case 5 and the lower case 6 are ultrasonically welded, and as a result, all the constituent elements of the battery pack can be easily fixed with one double-sided tape. Figure 2
In the case of, the battery pack is configured in the same manner as in the case of FIG. 1 except that the prismatic battery group 8 is used as the battery group.
The same effect can be obtained.

(Second Embodiment) In the first embodiment, the upper case 5 is used.
The double-sided tape 4 was used between the flexible substrate 3 and the flexible substrate 3, but in this embodiment, as shown in FIGS. 3 and 4, the battery group 1 (cylindrical type) or 8 (square type) and the opening 7 were formed. The double-sided tape 4 is used between the flexible substrate 3 and the flexible substrate 3. In the case of the battery pack thus obtained, the same results as in Example 1 are obtained.

Although the flexible substrate having the opening (FIG. 5) is used in the above embodiment, the same result can be obtained by using the flexible substrate 3 having the notch 9 as shown in FIG. . Further, the shape and position of the opening and the notch are not particularly limited.

[0016]

As described above, according to the present invention, by fixing the case and the battery group with one double-sided tape through the flexible substrate provided with the opening or the notch, it is possible to save space and cost. It is possible to realize a battery pack without rattling of the battery group.

[Brief description of drawings]

FIG. 1 is an exploded perspective view for explaining a fixing method of an embodiment of a battery pack using a flexible substrate according to the present invention.

FIG. 2 is an exploded perspective view for explaining a fixing method of an embodiment of a battery pack using a flexible substrate according to the present invention.

FIG. 3 is an exploded perspective view for explaining a method of fixing an embodiment of a battery pack using the flexible substrate according to the present invention.

FIG. 4 is an exploded perspective view for explaining how to fix an embodiment of a battery pack using a flexible substrate according to the present invention.

FIG. 5 is a perspective view showing an example of a flexible substrate having an opening.

FIG. 6 is a perspective view showing an example of a flexible substrate having a cutout portion.

FIG. 7 is an exploded perspective view for explaining a fixing method of a conventional example of a battery pack using a general flexible substrate.

FIG. 8 is an exploded perspective view for explaining a fixing method of a conventional example of a battery pack using a general flexible substrate.

FIG. 9 is an exploded perspective view for explaining a fixing method of a conventional example of a battery pack using a general flexible substrate.

FIG. 10 is an exploded perspective view for explaining a fixing method of a conventional example of a battery pack using a general flexible substrate.

[Explanation of symbols]

 1 battery group (cylindrical type) 2 lead wire 3 flexible printed circuit board (flexible substrate) 4 double-sided tape 5 upper case 6 lower case 7 opening 8 battery group (square) 9 notch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazushige Sato 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Akira Ito, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Katsuji Tsujioka, 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor, Naohiro Hamao 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A battery pack in which a battery group including a plurality of batteries, a flexible printed circuit board, and a double-sided tape are housed in a case, with an opening or a notch formed in the flexible printed circuit board. And the battery group and the case are fixed by the double-sided tape.