JP2003017008A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery having a battery cell with a mold, suppressing appearance defect of the mold, and suppressing reduction of fixing strength of the mold to the battery cell to suppress detachment of the mold from the battery cell. SOLUTION: In this battery A, the mold 2 is integrally fixed to the battery cell 1. In the mold 2, each of the tips 15 extending in one direction and having bottom faces fixed on the surface 11 of the battery cell 1 is formed with a thin part 21 for air venting thinner than a mold 20 in thickness from the surface 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery used in a mobile terminal or the like, and more particularly to a battery in which a molded portion is formed in a battery cell.

[0002]

2. Description of the Related Art Conventionally, as a battery used in a mobile terminal such as a mobile phone, there has been provided a battery cell having various circuit boards, for example, a protection circuit board against overcurrent. Generally, in this type of battery, the circuit board is integrally fixed to the battery cell by a molding resin from the viewpoint of handling convenience and design.

5 to 8 show an example of the above-mentioned conventional battery. In FIGS. 5 and 6, reference numeral 1 is a battery cell, and reference numeral 2 is a molded portion. The battery cell 1 is formed in a rectangular shape with a constant thickness, and the whole of the battery cell 1 is covered with a casing 3 made of aluminum. The casing 3 constitutes a positive electrode, and a side surface of the casing 3 has a negative electrode (not shown). Are formed.

As shown in FIGS. 7 and 8, a circuit board 5 is mounted on the side surface 4 of the battery cell 1. The circuit board 5 is one in which various electronic components 7 are mounted on the board body 6, the board body 6 is positioned in parallel along the side surface 4, and the back surface of the board body 6 is attached to the side surface 4 by the double-sided adhesive tape 8. It is attached to the battery cell 1 by pasting.

The circuit board 5 and the battery cell 1 are electrically connected by the electrode terminals 10. That is, the output terminal plate 12 is fixed to the side surface 11 of the casing 3 of the battery cell 1, the input terminal plate 13 is provided on the upper surface of the end of the substrate body 6, and the space between the output terminal plate 12 and the input terminal plate 13 is It is connected by the electrode terminal 10. Although this structure is the structure on the positive electrode side, the battery cell 1 and the circuit board 5 are connected with the same structure on the negative electrode side.

The circuit board 5 and the electrode terminals 10 are embedded in the molded portion 2 and are integrally fixed to the battery cell 1 by the molded portion 2. That is, in this battery, after assembling the circuit board 5, the electrode terminal 10 and the like to the battery cell 1, the circuit board 5 and the electrode terminal 10 are embedded in a resin by molding, and a molding portion 2 made of the resin is formed. It has a structure integrated with the battery cell 1.

In this case, the molded portion 2 is formed in the side surfaces 4 and 11 of the battery cell 1 so as to have a U-shaped appearance, and the side surfaces 4 and 11 have the same width and a predetermined thickness. It is formed in the extending direction of 11. Under this configuration, the molding section 2 has a structure shown in FIG.
The connection structure on the positive electrode side of the battery cell 1 is embedded in the portion indicated by reference numeral 14A, and the connection structure on the negative electrode side is embedded in the portion indicated by reference numeral 14B. In addition, battery cell 1
The power output from the circuit board 5 is taken out from the connector 19 via the output cable 18 shown in FIG.

[0008]

By the way, in the above battery, when molding the molded portion 2 to the battery cell 1, the molded portion 2 shown in FIG.
However, there is a problem in that the tip portion 15 is insufficiently molded, the tip portion 15 has a poor appearance, and the tip portion 15 is peeled off from the battery cell 1.

That is, when the molding portion 2 is molded, since the tip portion 15 has a shape protruding in one direction, air is apt to escape insufficiently when the resin is filled, and the tip portion 15 has sink marks, pin holes, There is a problem in that short-molding and the like frequently occur, the problem of poor appearance of the product occurs, and the adhesion strength to the battery cell 1 decreases. The tip 1 in FIG.
The sink mark F is shown as an example of the appearance defect that occurred in FIG. This problem becomes more remarkable as the molding die is made more elaborately,
It was also an obstacle to ensuring product accuracy.

Further, the tip portion 15 is a terminal portion when the resin is filled, and there is a problem that the molded resin after molding is peeled off from the battery cell 1 due to the decrease of the resin filling temperature. If the molded part 2 is peeled off from the battery cell 1, it cannot be offered to the market as a product, and it is difficult to disassemble and reuse the already molded product, which is a significant factor in battery manufacturing from the viewpoint of cost balance. There was the problem of financial loss.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a battery in which a molded portion is formed in a battery cell, in which a defective appearance of the molded portion occurs and a battery cell is formed. It is an object of the present invention to provide a battery capable of suppressing a decrease in the fixing strength of the molded part with respect to the battery and suppressing the occurrence of peeling of the molded part from the battery cell.

[0012]

In order to achieve the above object, the present invention provides the following means. Claim 1
The invention according to, in a battery in which a molded portion is integrally fixed to a battery cell, in the molded portion, a bottom surface of the molded portion is fixed to the surface of the battery cell, the tip portion extending in one direction, the surface And a thin wall portion for air bleeding, which is thinner than the main body of the molding portion.

According to the battery of the present invention, air is expelled from the main body of the molding portion toward the thin wall portion for removing air when the resin is filled during molding, and the thin wall portion escapes from the mold to the outside. Therefore, no pinholes or short molds are generated in the molding section body of the molding section.

According to a second aspect of the invention, in a battery in which a molded portion is integrally fixed to a battery cell, the bottom surface of the molded portion is fixed to the surface of the battery cell and extends in one direction. The tip is
It is characterized in that a portion which extends over the tip portion and extends in a direction intersecting with the direction, and extends in a direction away from the tip portion is held by a seal attached to the surface. is there.

According to the battery of the present invention, the tip of the molded portion is held on the battery cell side by the seal, and the tip is prevented from peeling off from the battery cell.

According to a third aspect of the present invention, in the battery according to the first aspect, the air bleeding thin portion extends over the air bleeding thin portion in a direction intersecting with the direction, and the air bleeding is performed. A portion extending in a direction away from the thin portion for use is held by a seal attached to the surface.

According to the battery of the present invention, since the thin portion for bleeding air is held on the battery cell side by the seal, the exfoliation of the tip portion of the molded portion is more reliably prevented. Further, even if pinholes or short molds are generated, they are generated in the thin portion for air bleeding where the air is expelled. Since the thin portion for air bleeding is covered by the seal, the problem of poor appearance does not occur.

According to a fourth aspect of the present invention, in the battery according to the second or third aspect, the seal is composed of a nameplate having a nameplate portion having a display portion and a holding portion holding the molded portion. It is characterized by that.

According to the battery of the present invention, a part of the nameplate serves as a seal for holding the tip of the molded portion, so that a good appearance can be obtained in terms of design.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention, which is a case where the present invention is applied to a battery for a mobile terminal. Battery A for portable terminal (battery) according to an embodiment of the present invention
Is a battery cell 1 to which a molded portion 2 is fixed.

This battery A has a basic structure similar to that of the battery shown in FIGS.
Although not shown in FIG. 2, the circuit board 5, the electrode terminals 10 and the like shown in FIG. 7 are provided, and the circuit board 5, the electrode terminals 10 and the like are embedded in the molding section 2 and the molding section 2 is embedded in the molding section 2. 2 is fixed to the battery cell 1. In FIGS. 1 and 2, the same components as those shown in FIGS. 5 to 8 are designated by the same reference numerals, and the description thereof will be omitted.

In the battery A, the bottom surface of the molded portion 2 is fixed to the side surface 11 (front surface) of the battery cell 1, and the tip portion 15 extends in one direction. Thin air removal thin part 21
Are formed. That is, the molding portion main body 20 of the molding portion 2 has a constant thickness from the side surface 11 and projects in the extending direction of the side surface 11 with the same width as the side surface 11. Then, a step portion 22 is formed at the end of the molding portion main body 20, and then a thin portion 21 for bleeding air is formed so as to further protrude from the end of the molding portion main body 20. The thin portion 21 for bleeding air is also thinner than the molding portion main body 20 but has a constant thickness and has the same width as the side surface 11 and projects in one direction in which the side surface 11 extends.

In this battery A, when molding the molded portion 2 with respect to the battery cell 1, particularly in molding the tip portion 15, after the resin filled in the mold forms the molded portion main body 20. The thin portion 21 for bleeding air is formed. At this time, the air in the mold is expelled from the molding unit main body 20 into the mold of the thin portion 21 for bleeding air, and is discharged from the mold to the outside. Here, the thin portion 21 for bleeding air
Since the cross-sectional shape of the mold has a thin thickness, the air in the mold for forming the mold is prevented from diffusing in each direction and is sequentially driven toward the tip end, and is well discharged to the outside.

Therefore, after the molding, the molding portion main body 2
In addition to 0, occurrence of pinholes and short-molding is suppressed also in the thin portion 21 for bleeding air, and in the tip portion 15 of the molded portion 2, occurrence of defective appearance and reduction in adhesion strength to the battery cell 1 are prevented. Therefore, it is possible to prevent the tip portion 15 from peeling off.

The thin portion 21 for bleeding air is provided on the side surface 11
Since the thickness of the thin portion 21 is small, it is difficult for the finger of the person who handles the battery or each part of the equipment to which the battery is attached to come into contact with the thin portion 21 for air bleeding. The peeling of the portion 15 is avoided. In this way, the battery A can prevent the appearance failure and the peeling of the molded portion 2, so that the yield of products can be improved.
In addition, as the resin used for molding the molding unit 2,
Polyamide resin or polyurethane resin is suitable.

Next, another embodiment of the present invention will be described with reference to FIGS. In the embodiment shown in FIGS. 3 and 4, a name plate 30 (sticker) is attached to the battery A shown in FIGS. 1 and 2 described above, and the thin portion 21 for air bleeding is attached to a part of the name plate 30. The battery cell 1 is held on the battery cell 1 side.

The name plate 30 is formed of a film mainly composed of a polyester film, and is shown in FIG.
As shown in a developed view of No. 3, it comprises a substantially rectangular nameplate portion 31 and a holding portion 32 formed in the nameplate portion 31 and holding the thin portion 21 for bleeding air. The nameplate portion 31 includes a rectangular sticking portion 34 conforming to the shape of the front surface 33 (see FIG. 1) of the battery cell 1 and a side surface 35 of the battery cell 1.
The sticking portion 36 has a shape matching the shape (see FIG. 1) and the sticking portion 38 has a shape matching the back surface 37 (see FIG. 3) of the battery cell 1. An adhesive is applied to the entire back surface of the name plate 30, and a display portion 39 on which the specifications of the battery are described is formed on the surface of the name plate portion 31.

In the name plate 30, the sticking portion 34 of the name plate portion 31 is stuck to the front surface 33 of the battery cell 1, the sticking portion 36 is stuck to the side surface 35, and the sticking portion 38 is stuck to the back surface 37. . Further, as shown in FIG. 3, the holding portion 32 goes over the thin portion 21 for air bleeding of the molded portion 2 and is folded back toward the back surface 37.
It is attached to 7. In addition, the holding part 32 is a sticking part 38.
Is attached to the back surface 37 prior to the above, and the attaching portion 38 is attached later to be covered by the attaching portion 38.

According to the battery of this embodiment, in addition to the effects of the above-described embodiment, the thin air-bleeding portion 21 of the molded portion 2 has the holding portion 3 of the nameplate 30.
Since it is held on the battery cell 1 side by 2, it is possible to more reliably avoid peeling of the tip portion 15 of the molded portion 2. That is, the name plate 30 extends over the air bleeding thin portion 21 in a direction orthogonal to the direction in which the thin portion 21 projects, and is attached to the thin portion 21.
The portion extending in the direction away from the thin portion 21 is attached to the battery cell 1. Therefore, the thin portion 2 for bleeding air
1 is firmly held on the battery cell 1 side, and peeling from the battery cell 1 is reliably prevented.

Further, according to this battery, even if a pinhole or the like is formed in the air bleeding thin portion 21, the thin portion 21 is covered by the holding portion 32 of the name plate 30.
From the viewpoint of design, it is possible to repair the defect in appearance and further improve the yield. Further, since the member that holds the thin portion 21 is a part of the name plate 30, it is possible to maintain a good design in appearance.

Furthermore, according to this battery, since the tip portion 15 of the embedded portion of the connection structure of the positive and negative electrodes of the battery cell 1 in the molded portion 2 is firmly held by the name plate 30, the battery is It is possible to prevent the user from accidentally disassembling the battery.

In this embodiment, the air bleeding thin portion 21 of the molding portion 2 is held by the name plate 30, but the air bleeding thin portion 21 may be held depending on the shape of the molding portion 2. Without providing the molding unit body 20 with the name plate 30
You may make it hold | maintain by seals, such as.

[0033]

As described above, according to the first aspect of the invention, the air is driven to the side of the thin wall portion for air bleeding during the molding process and escapes from the mold of the thin wall portion to the outside. Pinholes and short molds do not occur in the molded part body of the molded part, and it is possible to prevent defective appearance of the molded part and peeling from the battery cell,
It is possible to improve the yield in product manufacturing.

According to the second aspect of the invention, since the tip of the molded portion is held on the battery cell side by the seal, it is possible to prevent the tip of the molded portion from peeling off and repair the appearance defect. It is possible to improve the yield in product manufacturing.

Further, according to the third aspect of the invention, since the thin portion for bleeding air is held on the battery cell side by the seal, it is possible to more reliably prevent the tip portion of the molded portion from peeling off. In addition, since the thin portion for bleeding air is covered with the seal, it is possible to obtain the effect of repairing the defective appearance.

Further, according to the invention of claim 4, a part of the inscription plate serves as a seal for holding the front end portion of the molding portion, so that an effect that a good appearance can be obtained in terms of design can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a battery according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the battery shown in FIG.

FIG. 3 is a perspective view showing a stuck state of a battery seal according to another embodiment of the present invention.

4 is a development view of a seal used in the battery shown in FIG.

FIG. 5 is a perspective view showing an example of a conventional battery.

FIG. 6 is a perspective view of a main part of the battery shown in FIG. 5, showing an example of a defective appearance of a molded portion.

7 is a perspective view of a main part of the battery shown in FIG.

8 is an enlarged cross-sectional view of a main part of the battery shown in FIG.

[Explanation of symbols]

A battery 1 battery cell 2 Molding department 11 surface 15 Tip 20 Molding unit body 21 Thin part for bleeding air 30 seal (name plate) 31 Name Plate Department 32 holding part

Claims (4)

[Claims] 1. A battery in which a molded portion is integrally fixed to a battery cell, wherein the bottom surface of the molded portion is fixed to the surface of the battery cell and extends in one direction. The battery is characterized in that a thin wall portion for air bleeding is formed that is thinner than the molded portion body. 2. A battery having a molded portion integrally fixed to a battery cell, wherein a tip portion of the molded portion whose bottom surface is fixed to the surface of the battery cell and extends in one direction has a tip. Extending in a direction that crosses the section and intersects with the above direction,
A battery, wherein a portion extending in a direction away from the tip portion is held by a seal attached to the surface. 3. The battery according to claim 1, wherein the thin portion for air bleeding extends over the thin portion for air bleeding, extends in a direction intersecting the direction, and is separated from the thin portion for air bleeding. A battery, wherein a portion extending in the direction is held by a seal attached to the surface. 4. The battery according to claim 2, wherein the seal is composed of a nameplate having a nameplate part having a display part and a holding part holding the mold forming part. A battery that does.