JP3510553B2 - Battery pack - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a battery pack used in a portable electronic device.

[0002]

2. Description of the Related Art In recent years, electronic devices such as mobile phones have become smaller and lighter, and there has been a demand for a battery pack used as a power source of the electronic device to be thin. Therefore, the battery is made flat and the outer case made of synthetic resin for accommodating the battery is thinned to reduce the thickness of the entire battery pack.

[0003]

However, the surface of the outer case having a reduced wall thickness does not have sufficient strength as a matter of course, and may be damaged when a strong external force is applied. The present invention has been made in view of the above circumstances, and an object thereof is to provide a battery pack in which the strength of an outer case can be increased.

[0004]

The battery pack according to the invention of claim 1 for solving the above-mentioned problems is a battery pack in which a battery main body is housed in a flat outer case made of synthetic resin. At least one of the end faces in the thickness direction of the case has a mounting recess at the center of the surface.
Part of the mounting recess
Is characterized in that an opening is partially provided, leaving a peripheral edge portion, and a metal flat plate having a shape matching with this is attached to the mounting recess to cover the opening.

[0005]

According to a second aspect of the present invention, in the first aspect, the thickness of the metal flat plate is 50 to 200 μm.
It has a feature in that.

A third aspect of the present invention is characterized in that, in the first or second aspect, a display as a nameplate is attached to the surface of the metal flat plate .

The battery pack according to claim 1 is mounted so that a part of the battery pack is exposed to the outside of the portable electronic device, and the outer case is the portable electronic device. It is configured by combining a case on the side exposed to the outside and a cover located inside the portable electronic device in the thickness direction of the battery pack, and the case is formed to be thicker than the cover. The metal plate may be attached to the cover. According to this, strength is ensured by forming the outer case thicker than the inner cover, and strength is secured by attaching a metal plate to one cover.

[0009]

According to the invention of claim 1, since the metal plate is attached to at least one of the end faces in the thickness direction of the outer case, the strength of the end face can be increased.

In addition , since a thin wall portion is likely to cause a lack of thickness, molding accuracy is required. However, by providing an opening, a part of one mold is passed through the opening to the opposite side. Since it can be held against the mold of
The position accuracy of the mold is improved. Therefore, it is possible to obtain sufficient molding accuracy and prevent lack of thickness. Further, by covering the opening with a metal plate, the internal battery is protected without being exposed.

According to the second aspect of the present invention, by setting the thickness of the metal plate to 50 to 200 μm, it is possible to reduce the thickness of the outer case while ensuring appropriate strength.

According to the invention of claim 3 , since the metal plate also has a function as a name plate, an increase in the number of parts can be suppressed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to FIGS. The battery pack 10 of the present embodiment is attached to a mobile phone (not shown),
It is used as a power source. The battery pack 10 is
It is composed of a battery body (not shown) and an outer case 11 that houses the battery body, and a secondary battery such as a lithium ion battery is used for the battery body. Further, the battery body has a flat box shape, and the outer case 11 is also formed into a flat box shape as a whole in accordance with it.

The outer case 11 is made of, for example, a synthetic resin material such as PC-ABS resin, and as shown in FIG. 4 and FIG. 5, the case 12 and the cover 13 which are substantially halved in the thickness direction are combined. It consists of: The phone body is provided with a recess, and the battery pack 10 has a case 12 with the cover 13 side facing inward.
Is attached while being exposed to the outside. In the following description, the front side (cover 13 side) in FIG. 1 is referred to as the front.

The case 12 is a substantially rectangular flat outer end surface 1.
4, a peripheral wall portion 15 is provided on the front surface side along the periphery of the outer end surface 14, and an accommodation recess (not shown) for accommodating half of the battery main body in the thickness direction is formed inside thereof. ing. Further, a pair of left and right locking projections 17 projecting forward (on the cover 13 side) and downward are provided at the lower end of the peripheral wall portion 15. The locking projection 17 can be engaged with the cover 13 and is also used for locking when the battery pack 10 is mounted on the telephone body. The thickness of the outer end surface 14 of the case 12 is set to 0.7 mm, for example.

On the other hand, the cover 13 is provided with a generally rectangular inner end surface 19 that is flat as a whole, and is provided with a peripheral wall portion 21 on the rear side along the peripheral edge thereof, and inside thereof also in the thickness direction of the battery main body. An accommodation recess is formed in which half of the above is accommodated. The case 12 and the cover 13 are assembled by ultrasonic welding in a state in which the tips of both peripheral wall portions 15 and 21 are combined while the battery main body is accommodated in both accommodation recesses.

A pair of left and right rectangular connecting holes 22 are formed in the upper end portion of the inner end surface 19, and the connecting holes 22 are formed.
The electrodes of the internal battery body and the terminal fittings on the telephone body side are connected through the. Also, the inner end surface 19
A mounting recess 24 having a shape matching the metal plate 30 described later is provided in the center of the surface of the. The thickness t1 of the portion of the inner end surface 19 other than the mounting recess 24 is, for example, 0.35 mm, and the thickness t2 of the portion having the mounting recess 24 is, for example, 0.2.
It is set to 5 mm (see FIG. 6). In addition, the mounting recess 24
A rectangular opening 25 is provided at the center of the.

A metal plate 30 is adhered to the inside of the mounting recess 24 by means of an adhesive material, so that the entire opening 25 is covered. The metal plate 30 is made of, for example, stainless steel and has a thickness of 100 μm, for example.
Further, the surface of the metal plate 30 (the surface opposite to the mounting recess 24) is provided with a display for functioning as a nameplate.

The present embodiment has the above configuration. According to this embodiment, the strength of the inner end face 19 can be increased by attaching the metal plate 30 to the inner end face 19 which is one of the end faces in the thickness direction of the outer case 11. For example, the strength is improved as compared with the case where the inner end surface 19 is formed with a uniform thickness (for example, 0.35 mm) without attaching a metal plate. Therefore, it is possible to prevent the outer case from being damaged by a strong external force. Further, by forming the outer end surface 14 of the case 12 exposed to the outside of the telephone to be thicker than the inner end surface 19 of the inner cover 13, strength is obtained, while the thin cover 13 is provided with the metal plate 30. The strength is secured by pasting.

In addition, since a thin wall portion is apt to cause a lack of thickness, molding accuracy is required. However, by providing the opening 25 in the cover 13, a part of one of the molds can be molded at the time of molding. Since the mold can be held against the mold on the opposite side through the opening 25, the accuracy of the mold position can be improved. Therefore, sufficient molding accuracy can be obtained, and it is possible to prevent the thin mounting recess 24 from being thin. Furthermore, the opening 2
By covering 5 with the metal plate 30, the internal battery is protected without being exposed. In addition, the thickness of the metal plate 30 is 50 to 200 μ.
By setting m, the outer case 11 can be secured while ensuring appropriate strength.
It is possible to reduce the wall thickness of. Further, conventionally, a paper sticker or the like indicating the name of the battery pack has been attached to the cover, but in the present embodiment, since the metal plate 30 is provided with an indication and has a function as a name plate, the parts are The increase in points can be suppressed.

The technical scope of the present invention is not limited to the above-described embodiment, and the following technical scope is also included in the technical scope of the present invention. (1) In the above embodiment, the battery pack 1 for a mobile phone
However, according to the present invention, it may be used for other portable electronic devices such as a notebook computer. (2) In the above embodiment, only the cover 13 has the metal plate 30.
According to the present invention, the metal plate is attached to the case 12.
You may stick it on the side. (3) In the above embodiment, the outer case 11 is the PC-AB.
Although it is formed of S resin, according to the present invention, the outer case may be formed of other synthetic resin material such as PC alone. (4) In the above embodiment, one opening 25 is provided in the center of the cover 13. However, according to the present invention, the opening may be provided not only in the center of the cover but also at a position closer to the end, and a plurality of openings may be provided. It may be provided.

[Brief description of drawings]

FIG. 1 is a front view showing a battery pack of the present embodiment.

[Figure 2] Rear view of the battery pack

[Fig. 3] Bottom view of the battery pack

FIG. 4 is a side view showing a state before mounting the exterior cover.

FIG. 5 is a side view of the battery pack.

FIG. 6 is a partially enlarged cross-sectional view showing a bonded portion of a metal plate.

[Explanation of symbols]

10 ... Battery pack 11 ... Exterior case 12 ... Case 13 ... Cover 19 ... Inner end face (end face) 25 ... Opening 30 ... Metal plate

Continuation of the front page (56) Reference JP-A-8-185836 (JP, A) JP-A-11-96983 (JP, A) JP-A-11-176400 (JP, A) JP-A-10-40885 (JP , A) JP 2000-149892 (JP, A) JP 2001-93496 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01M 2/02-2/10

Claims (3)

(57) [Claims] 1. A battery pack in which a battery main body is housed in a flat outer case made of synthetic resin, wherein at least one of the end faces in the thickness direction of the outer case has at least one end face.
The mounting recess is partly recessed in the center of the surface, leaving the peripheral edge.
The mounting recess has an opening that leaves the peripheral edge.
A battery pack, characterized in that it is provided separately, and a metal flat plate having a shape matching with the mounting recess is attached to the mounting recess to cover the opening. 2. The thickness of the metal flat plate is 50 to 200.
The battery pack according to claim 1, wherein the battery pack has a thickness of μm. 3. The battery pack according to claim 1, wherein an indication as a nameplate is attached to the surface of the metal flat plate .