JP2003068256A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery, in which a circuit board and electrode terminals are fixed integrally to a battery cell by a molded part that can be firmly fixed to the battery cell. SOLUTION: In the battery A, the circuit board is arranged along the surface of the battery cell 1, and the circuit board is buried in the molded part 2 and is fixed integrally to the battery cell 1. The molded part 2 is formed as a bar shape extending along the surface of the buttery cell, and a remaining gate 4 is formed in almost the middle between both ends of the molded part 2.

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.

4 to 7 show an example of the above-mentioned conventional battery. In FIG. 4, reference numeral 1 is a battery cell, and reference numeral 2 is a molded portion. The battery cell 1 is formed in a substantially plate-like shape, and almost entirely is covered with a casing 3 made of aluminum.
The casing 3 constitutes a positive electrode, and a negative electrode (not shown) is formed on the side surface of the casing 3. Further, in the molding process, the gate mark 4 is formed at a position apart from the substantially central part of both ends of the molded part 2 and near the center in the width direction.

FIG. 5 shows a cross-sectional shape of the mold part. As mentioned above, reference numeral 1 is a battery cell and reference numeral 2 is a battery cell.
Is a molded part. As described above, the gate mark 4 is formed near the center of the end of the molded portion 2.

As shown in FIGS. 6 and 7, a circuit board 6 is attached to the side surface 5 of the battery cell 1. The circuit board 6 is one in which various electronic components 11 are mounted on the board body 10, the board body 10 is positioned in parallel along the side surface 5, and the back surface of the board body 10 is attached to the side surface 5 by the double-sided adhesive tape 12. It is attached to the battery cell 1 by pasting.

The circuit board 6 and the battery cell 1 are electrically connected by the electrode terminals 13. That is, the output terminal plate 15 is provided on the side surface 14 of the casing 3 of the battery cell 1.
Are fixed, and an input terminal plate 16 is provided on the upper surface of the end portion of the substrate body 10. The output terminal plate 15 and the input terminal plate 16 are connected by the electrode terminal 13.

The electrode terminal 13 is formed by bending a strip-shaped conductor plate, and has a fixed portion 20 whose one end is fixed to the output terminal plate 15 and a shape of a side surface of the casing 3 from the fixed portion 20. A lead-out portion 21 that is bent at a right angle along and extends along the side surface 5 while contacting the side surface 5, and a bent portion 2 that is bent in a direction away from the lead-out portion 21 and the side surface 5.
2 and a fixing portion 23 extending from the bent portion 22 along the substrate body 10 and fixed to the input terminal board 16. Although this electrical connection structure is on the positive electrode side, the battery cell 1 and the circuit board 6 are connected with the same structure on the negative electrode side.

The circuit board 6 and the electrode terminals 13 are embedded in the molded portion 2 and integrally fixed to the battery cell 1 by the molded portion 2. That is, in this battery, after the circuit board 6, the electrode terminal 13 and the like are assembled to the battery cell 1, the circuit board 6 and the electrode terminal 13 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.

The power output from the battery cell 1 and the circuit board 6 is taken out from the connector 25 via the output cable 24 shown in FIG. In addition, in the above-described configuration, the protrusion 26 is formed on the gate mark 4 of the mold forming unit 2 after the mold is formed, and the protrusion 26 is cut off by using a tool such as a nipper after the formation.

[0010]

By the way, in the conventional battery manufacturing process, particularly in the molding process, the protrusion 26 is also a flow path for pouring the resin into the mold.
However, since it is located away from substantially the center of both ends of the molded portion 2, there is a difference in the distance for the resin that is poured into the mold and that is divided into left and right parts to reach the ends. Therefore, the resin temperature suddenly decreases before the resin is sufficiently distributed in the mold, which hinders the sticking of the resin, thereby forming the tip of the mold-molded portion 2 in the vicinity of the tip portion 2a shown in FIG. However, there is a problem that the molded part 2 is easily separated from the battery cell 1.

In the above battery, when the molded portion 2 is peeled off from the battery cell 1, it cannot be offered as a product to the market, and it is difficult to disassemble and reuse the battery, which makes it difficult to manufacture the battery. There is a problem in that the yield is poor and a great economic loss occurs.

Further, the projection 26 is formed by the molding section 2
Since it is located in the vicinity of the center in the width direction of the mold, when cutting or deburring the protrusion 26 after molding, the blade of a tool such as a nipper hits the side surface of the molding part 2 and the like. There is a problem in that it hinders them and makes these tasks difficult.

The present invention has been made in consideration of such circumstances, and an object thereof is to provide a battery in which a circuit board and an electrode terminal are integrally fixed to a battery cell by a molding portion. An object of the present invention is to provide a battery capable of firmly fixing the molded portion.

[0014]

In order to achieve the above object, the present invention provides the following means. Claim 1
The invention according to claim 1, wherein a circuit board is arranged along the surface of the battery cell, the circuit board is embedded in a molded portion, the battery is integrated with the battery cell, the molded portion on the surface. It is characterized in that it has a long shape extending along it, and that a gate mark is formed at approximately the center of both ends thereof.

In the battery according to the present invention, since the gate mark is formed substantially at the center of both ends of the molded portion, this position can be used as various indicators. For example, a label is attached to the surface of the battery cell when it is shipped as a product, and it can be used as an index for center alignment when attaching the label.

Further, when the protrusion is cut off, if it is not completely cut off from the root but left with a slight length, the remaining part is used as a backlash preventing rib when the battery is stored in the case. However, at this time, since the backlash preventing rib is at the center of the molded portion, the battery can be held in the case in good balance with only this one rib.

Furthermore, in the step of performing the mold forming in which the resin is poured into the mold at the time of manufacturing, since the gate marks are formed in the substantially central portions of both ends of the mold forming part, the resin injection is biased. You will be able to do without it. Therefore, the inflow of the resin becomes smooth, the molding is carried out in a good state without a sudden temperature drop of the resin, and the molded portion is firmly fixed,
The peeling can be prevented. Therefore, the yield of products is improved, and economic loss can be reduced.

According to a second aspect of the present invention, in the battery according to the first aspect, the battery cell is formed in a substantially plate shape, and the molded portion is formed along a side surface of the battery. And According to the battery of the present invention, it is difficult to inject the resin because the width of the molded portion is small in the step of molding in which the resin is poured into the mold during manufacturing. However, since the trace of the gate is formed at a position corresponding to substantially the center of one side of the rectangular shape, the resin can be uniformly flowed in, so that the resin can be smoothly flowed in and good molding can be performed. be able to.

According to a third aspect of the present invention, in the battery according to the second aspect, the gate trace is formed on an end edge in the width direction of the molded portion. According to the battery of the present invention, the gate mark is formed on the widthwise end edge of the molded portion, so that the cutting is easy. This is because cutting the protrusions formed at the corners is more difficult than cutting the protrusions formed on the flat portion because the blade does not hit the peripheral portion. Work and deburring work can be simplified and production efficiency can be improved.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are views showing an embodiment, in which the present invention is applied to a battery for a mobile terminal. The battery A (battery) for a mobile terminal shown in FIG. 1 is a battery cell 1 and a circuit board (not shown) attached to the battery cell 1.
And electrode terminals (not shown) for electrically connecting the battery cell 1 and the circuit board, and the circuit board and the electrode terminal are formed by the molded portion 2 so that the battery cell 1
It is configured to be integrally fixed to.

The protrusion 26 near the center of the end of the molded portion 2 is formed in the molding process, and this portion is cut off in the finished product, and its cross section becomes the gate mark 4. These basic configurations are the same as those of the conventional products shown in FIGS. In this case, the molded portion 2 includes a base portion 2b along the long side of the battery cell 1 and a side portion 2c along the short side of the battery cell.
It consists of

FIG. 2 shows the battery 2 for a portable terminal with the protrusion 2
FIG. 6 is a cross-sectional view including 6 and a gate mark 4;
The positional relationship among the battery-cell 1, the molded portion 2 and the gate mark 4 is shown. The straight line B is a straight line showing the parting surface of the mold, and the mold is separated from the first mold and the second mold (not shown) by this line. 1 to 3, the same parts as those shown in FIGS. 4 to 7 are designated by the same reference numerals, and the description thereof will be omitted.

In the portable terminal battery A, the positions of the molded portion 2 and the gate mark 4 formed therein are different from those shown in FIGS. 4 to 7. That is, the molding unit 2
As shown in FIG. 2, when the upper side dimension is T1 and the lower side dimension is T2, the cross section has a shape that widens from the lower side to the upper side so as to satisfy the conditional expression of T1> T2. The gate trace 4 is formed on the edge in the width direction.

FIG. 3 shows the mold 27, the battery cell 1, and the circuit board 6 when the above-mentioned portable battery A is molded and processed. The battery cell 1 and a circuit attached to the battery cell 1 are shown. The substrate 6 is housed in the mold 27. The mold 27 is provided with a nozzle 31 that is a resin injection part and a gate 32 that is a flow path thereof at the center of both ends of the mold side surface 30 facing the circuit board 6.
A space 33 is formed between the mold 27 and the battery cell 1 in which the mold forming part 2 is to be formed.

In this structure, when the battery A for portable terminal is molded, the molten resin is supplied from the nozzle 31 into the mold 27 from the gate 32. In this case, since the gate 32 is located at a position substantially corresponding to the center of the base portion 2b of the battery cell 1, the resin branches in the left-right direction in the drawing and advances toward the end portion of the battery cell 1, respectively. Further, the resin changes its direction and advances to the side portion 2c along the short side of the battery cell 1, and finally reaches the end portion 33a of the space. In this resin filling, since the resin is supplied from almost the center of the flow path, the filling is smoothly performed.

Thus, the molding is completed by cooling the resin in the state where the filling is completed. The molded battery A for a mobile terminal includes a protrusion 26 shown by a two-dot chain line in FIG. After this process, the protrusion 26 is cut with a tool such as a nipper. At this time, the length T3 of the protrusion shown in FIG. 2 and the width T4 of the protrusion of the protrusion 26 are T3 <3.
When the conditional expressions of 5 (mm) and T4 <1 (mm) are satisfied, it is possible to cut with a tool such as a commercially available nipper, so it is preferable to fit within this dimension.

According to the portable terminal battery A,
Since the gate mark 4 is formed at the center of the base 2b of the molded portion 2, the gate mark 4 can be used as various indicators. For example, a label is attached to the surface of the battery cell 1 at the stage of shipping the battery A for mobile terminal as a product to the market, and it can be used as an index for center alignment when attaching the label.

Further, when the protrusion is cut off after molding, it is not completely cut off from the root but is cut out with a slight length left, and the remaining part is prevented from rattling when the battery is stored in the case. It can be used as a rib. At this time, it is difficult to keep the battery stable because there is only one rattling rib, but this rib is located in the center of the molded part, so even with only one rib, the battery is well balanced in the case. Can be held.

Further, in the battery A for the portable terminal, the base portion 2b of the molded portion 2 is molded at the time of molding.
Since the filling is performed from near the center of the mold, the resin reaches the tip 2a of the molded portion 2 at the same distance from the gate, which prevents a sharp decrease in the resin temperature. If the other filling distance is long,
It is possible to prevent peeling of the molded portion 2 that occurs at the end portion on the long side. Therefore, the yield of products becomes good, and the economic loss can be reduced.

Furthermore, since the releasing surface of the mold 27 is on the same plane as the upper surface of the battery cell 1 as shown in FIG. 2, even if burrs are produced after molding, Since it is the end portion in the width direction of the molded portion 2, the deburring work can be performed very easily. Similarly, the work of separating the protrusion 26 is also easy.

In the above embodiment, the battery for the portable terminal is used, but it can be applied to the batteries for various electronic devices.

[0032]

As described above, according to the first aspect of the invention, in a battery in which a circuit board is integrated with a battery cell by molding, a gate mark is formed at substantially the center of both ends of the molding part. Since it is formed, it can be used as various indexes such as the position used for centering the label sticking. Further, when cutting off the protrusion, if a small length is left, the remaining portion can be used as a backlash preventing rib when the battery is housed in the case. At this time, since the backlash preventing rib is located in the center of the molded portion, the battery can be held in a balanced manner in the case with only this one rib. Therefore, it is possible to prevent the battery from moving due to play during use.

Further, during the molding process, it is possible to inject the resin evenly, it is possible to prevent a sharp decrease in the resin temperature, and it is possible to prevent the molded part from peeling off near the tip. Therefore, the yield of products can be improved, and economic loss can be suppressed.

According to the second aspect of the invention, since the battery cell is formed in a substantially plate shape and the gate trace is formed in the substantially central portion of one side of the plate shape, the molding process at the time of manufacturing is performed. At times, although the resin inflowability is deteriorated due to the small width dimension of the molded portion, the resin can be smoothly inflowed, and the molding can be favorably performed.

According to the third aspect of the invention, since the trace of the gate is formed on the widthwise edge of the molded portion, the work of cutting the protrusion and the deburring work are relatively easy. Therefore, the manufacturing process can be simplified and the production efficiency can be improved.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of a main part of the battery shown in FIG.

FIG. 3 is a diagram showing the battery shown in FIG. 1 and a mold for manufacturing the battery, and is a schematic configuration diagram showing a state in which a resin flows.

FIG. 4 is a perspective view showing an example of a conventional battery.

5 is a cross-sectional view of a main part of the battery shown in FIG.

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

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

[Explanation of symbols]

1 battery cell 2 Molding department 4 gate marks 6 circuit board 14 sides

Claims (3)

[Claims] 1. A battery in which a circuit board is arranged along a surface of a battery cell, and the circuit board is embedded in a molded portion so that the battery cell is integrated with the molded portion. A battery characterized in that it has a long shape that extends along it, and that a gate mark is formed at approximately the center of both ends thereof. 2. The battery according to claim 1, wherein the battery cell is formed in a plate shape, and the molded portion is formed along a side surface of the battery. 3. The battery according to claim 2, wherein the gate trace is formed on an end edge of the molded portion in the width direction.