JP3471323B2 - Battery and mobile device with this - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery suitable for mobile phones and the like and a portable terminal equipped with this battery.

[0002]

2. Description of the Related Art For example, batteries used in mobile terminals such as mobile phones and PHSs (simple mobile phones) tend to be smaller and lighter year by year as battery performance improves. Conventionally, a battery used in a mobile terminal has a case having a case manufactured by deep-drawing an aluminum material (hereinafter, referred to as an aluminum can battery) has been mainstream. However, the aluminum can battery has a limitation in the thickness dimension of the battery due to the deep drawing of the case, and there is a limit to the reduction in thickness.

Therefore, there has been proposed a laminated pack battery in which a unit cell is hermetically sealed with a laminate film so as to be small, lightweight and thin (for example, Japanese Patent Laid-Open No. 2000-
No. 323110). The battery of this laminate pack has low rigidity as it is, and the rigidity must be increased by some reinforcing means.

Conventionally, as a reinforcing method, the battery of the laminate pack is sandwiched from both the front and back sides by a resin case, and the case on the front side and the case on the back side are ultrasonically welded to each other to increase the rigidity.

[0005]

However, in this structure, since the case is provided outside the laminate pack, there is a problem that the battery becomes thick. In addition, since there is a gap in the case, the required rigidity cannot be obtained. Furthermore, if dropped, the case may be damaged from the welded portion. In addition, foreign matter may enter the case and cause a short circuit or the like.

Therefore, the present invention provides a laminate pack type battery which has a predetermined rigidity while having a simple structure and can be made small, lightweight and thin, and a portable terminal provided with this battery. .

[0007]

In order to solve the above problems, a battery according to the invention described in claim 1 is a battery cell of a laminate pack and a circuit electrically connected to each terminal of the battery cell. comprising a substrate and an electrical connection portion electrically connected to the circuit board, these bars
Electrically connects the battery cell, circuit board, and electrical connection
The battery unit thus obtained is characterized in that the connection end portion of the electrical connection portion is exposed , and the battery unit is encapsulated by molding with resin .

With this configuration, the mode
Since the resin mold portion formed by the groove functions as a reinforcing material, the rigidity of the battery is improved. Moreover, since the battery cell, the circuit board, and the electrical connection portion are enclosed by the resin mold portion and there is no gap inside, foreign matter does not enter the inside of the battery. Moreover, the number of battery parts can be reduced, and the structure can be simplified and the battery can be made thin.

According to the invention described in claim 2, in the invention described in claim 1, a part of the battery cell is the
It is characterized in that it is exposed from a resin mold portion formed by molding. With this configuration, when the battery cell expands due to the temperature rise, it can escape at the portion exposed from the resin mold portion.

According to a third aspect of the present invention, in the first or second aspect of the invention, the electrical connection portion is a connector provided directly on the circuit board. With this configuration, the resin mold portion reinforces the connection between the circuit board and the connector. According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the electrical connection portion includes a lead wire connected to a circuit board and a connector provided at a tip of the lead wire. It is characterized in that the lead wire and the connector are exposed from the resin mold portion formed by the mold. With this configuration, the resin mold portion reinforces the connection between the circuit board and the lead wire. A fifth aspect of the present invention is characterized in that, in the first or second aspect of the invention, the electrical connection portion is a connection terminal provided on a circuit board.

According to a sixth aspect of the invention, there is provided a mobile terminal including the battery according to any one of the first to fifth aspects. With this configuration, the battery storage space in the mobile terminal can be reduced.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings of FIGS. [First Embodiment] First, a first embodiment of the present invention will be described with reference to the drawings of FIGS. 1 to 12. Figure 1
2 is a perspective view of the battery 1 according to the first embodiment as seen from the front side, and FIG. 2 is a perspective view as seen from the back side.

The battery 1 is, for example, a lithium ion battery used for a mobile phone as a mobile terminal or for a PHS. The battery 1 is composed of a battery unit 2, a resin mold portion 3 and a label 4. As shown in FIGS. 3 and 4, the battery unit 2 includes a battery cell 5, a circuit board 6, and a connector (electrical connection portion) 7.

The battery cell 5 is formed by placing a laminate film formed by laminating resin films on both front and back surfaces of an aluminum foil into a tube-shaped container, the electrolyte and electrodes, and sealing the ends of the container by stacking them. There is. The battery cell 5 of this laminate pack is a battery cell that can be made smaller and thinner than one using a deep-drawing metal container. A positive electrode terminal 5a and a negative electrode terminal 5b extend to the battery cell 5.

The circuit board 6 is a board including a charge control circuit connected to the positive electrode terminal 5a and the negative electrode terminal 5b of the battery cell 5 and a short circuit safety circuit. At both ends of the circuit board 6, substantially semicircular positioning recesses 6 a, 6 are formed.
a is formed. The connector 7 is integrally provided at the center of the surface of the circuit board 6, and is connected to the positive electrode terminal 5a and the negative electrode terminal 5b of the battery cell 5 via the respective circuits of the circuit board 6. That is, the connector 7 is directly provided on the circuit board 6. The connector 7 is a member that is inserted into a connector 25 of the mobile phone K described later to electrically connect the battery cell 5 and the mobile phone. The insertion portion (connection end portion) 7 a of the connector 7 is directed toward the front end side of the battery cell 5.

As shown in FIG. 1, the battery unit 2 thus constructed is entirely covered with the resin mold portion 3 except for the central portion 5c of the surface of the battery cell 5 and the insertion portion 7a of the connector 7. Then, the label 4 is affixed to the resin mold portion 3 on the back surface side to form the rectangular thin battery 1. As a result, the battery cell 5, the circuit board 6, and the connector 7 are integrally fixed by the resin mold portion 3.

According to the battery 1 of the first embodiment, since the resin mold portion 3 itself has rigidity and functions as a reinforcing material, the battery 1 can be made thin and the laminate pack type battery 1 can be realized. The strength and rigidity of the are increased, and the impact resistance and the like are improved, and the reliability is improved. Moreover, since the resin mold portion 3 also functions as a reinforcing material for the connector 7, the reliability of the connector 7 is also improved.

Further, since the battery cell 5, the circuit board 6, and the connector 7 are wrapped in the resin mold portion 3 without a gap, foreign matter does not enter the inside of the battery 1 and a problem caused by the foreign matter intrudes. Can be prevented.

Further, since the resin mold portion 3 itself functions as an insulating material, no other insulating member is required. Moreover, since the battery cell 5, the circuit board 6, and the connector 7 are integrally fixed by the resin mold portion 3, Battery 1
The structure can be simplified and the number of parts can be reduced.

Further, the central portion 5 of the surface of the battery cell 5
Since c is exposed from the resin mold portion 3, when the battery cell 5 expands due to a temperature rise, the surface central portion 5c can bulge outward and escape. Therefore, both the battery cell 5 and the resin mold portion 3 can be prevented from being damaged.

Next, a method of manufacturing the battery 1 will be described with reference to FIG. First, the circuit board 6 provided with the connector 7 is joined to the positive electrode terminal 5a and the negative electrode terminal 5b of the battery cell 5 by spot welding or the like to form the battery unit 2 as shown in FIG. 3 in advance.

Then, the battery unit 2 is attached to the mounting groove 1 formed in the lower mold (mold) 10a made of aluminum.
Set to 1a. At this time, the recesses 6a, 6a for positioning the circuit board 6 of the battery unit 2 are attached to the mounting groove 11
By engaging with the positioning pins 11c and 11c provided in a, the insertion part 7a of the connector 7 of the battery unit 2 is brought into close contact with the inner wall 11d of the mounting groove 11a. As a result, a space is formed around the battery unit 2.

In this state, the aluminum upper mold (mold)
In order to align the mounting groove 11b of the lower mold 10b with the mounting groove 11a of the lower mold 10a, the positioning pin 12 of the lower mold 10a is moved to the upper mold 1
0b of the upper mold 10b and the lower mold 10
Clamp a. At this time, the mounting groove 11b of the upper mold 10b
The push-out hole 11e provided at the center of the battery cell 5
It closely contacts the central portion 5c of the surface of the.

Next, a polyamide resin or a polyolefin resin is injected at a low temperature and a low pressure through the resin injection groove 14 (14a, 14b) formed in the joining portion between the upper mold 10b and the lower mold 10a. The reason for injecting the resin at low temperature and low pressure is that it does not adversely affect the battery cells 5 and the circuit board 6. Since the polyolefin resin has higher mechanical strength than the polyamide resin, it is suitable for forming the high-strength battery 1.

The injected resin is attached to the mounting groove 11 in the mold 10.
The cavity 11 (11a, 11a formed between a and 11b
11b) Go around. In this embodiment, the upper mold 10
The resin is injected around the battery unit 2 except for the central portion 5c of the surface of the battery unit 2 which is in close contact with the extrusion hole 11e of b and the insertion portion 7a of the connector 7 which is in close contact with the inner wall 11d of the lower mold 10a. It

Then, the mold 10 is forcibly or left to cool, and when the resin is solidified in the mold 10, the mold is opened and the product is extruded through the extrusion hole 15 to complete the production of the battery 1. As a result, the battery 1 in which the central surface portion 5c of the battery cell 5 and the insertion portion 7a of the connector 7 are exposed from the resin mold portion 3 is manufactured.

According to this battery manufacturing method, the battery unit 2 is set in the mold 10, resin is injected into the cavity 11 of the mold 10 to be solidified in the mold 10, and the mold is opened after cooling. Since the battery 1 is manufactured in this manner, it is possible to easily manufacture the battery 1 in which the battery cell 5, the circuit board 6, and the connector 7 are wrapped in the resin mold portion 3 without a gap and are integrated, and the productivity is improved. .

Next, a mobile phone K as a mobile terminal to which the battery 1 is attached will be described with reference to FIGS. 6 and 7. The mobile phone K shown below has a display unit 2
0 and the key operation part 21 have a well-known structure in which they can be folded by a hinge 22. Therefore, a perspective view seen from the back side in a folded state so that the mounted state of the battery 1 can be understood without showing the overall shape. Only the figures will be described.

On the back side of the operation section 21 of the mobile phone K, a concave accommodation section 23 for mounting the battery 1 is formed. A lid 24 is detachably attached to the housing portion 23. Specifically, the protrusions 24a and 24a are formed on the base end side of the lid body 24, and the locking portions 24b are formed on the tip end side, and the protrusions 24a and 24a are locked to the housing portion 23 and the mobile phone K side. 24b on the release hook H of
Is locked and attached to the housing portion 23.

A main body side connector 25 to be inserted into the connector 7 is attached to the accommodating portion 23 at an inner wall 23a facing the sliding direction of the battery 1 and at a position facing the connector 7. That is, the housing portion 23
After the battery 1 is set in, the battery 1 is slid to the front side connector 7 side, so that the connector 7 of the battery 1 is connected to the main body side connector 25. Therefore, the accommodating portion 23 is the battery 1
When the connector 7 is mounted and the connector 7 is inserted into the main body side connector 25, a space for inserting the battery 1 is formed between the connector 7 and the rear end of the battery 1.

Then, as shown in FIG. 7, a pair of fixing ribs 26 are formed on the rear side of the lid body 24 on the base end side.
The fixing ribs 26, 26 are the connector 7 of the battery 1.
At the time of joining, it is inserted into a space formed between the housing 23 and the rear end of the battery 1, that is, a space serving as a margin for inserting the connector 7. Each fixing rib 26 is provided with an inclined surface 26a, and the lid 24 is accommodated in the housing portion 23.
When it is attached to, the force for supporting the rear end of the battery 1 (toward the front) is generated. In the mobile phone K configured in this way, the space of the housing portion 23 for housing the battery 1 can be reduced by the size of the battery 1 itself and the need for a harness. Therefore, the mobile phone K as a whole is small and lightweight. Can be converted.

Next, referring to FIGS. 6 to 12,
A procedure for mounting the battery 1 on the mobile phone K will be described. As shown in FIG. 6, the lid 24 of the mobile phone K is opened and removed, and the battery 1 is mounted in the housing portion 23 (FIG. 8). Next, as shown by the arrow in FIG. 8, the battery 1 is slid forward to connect the connector 7 of the battery 1.
Plug into the main unit side connector 25 (Fig. 9). Next, as shown in FIGS. 10 and 11, when the lid 24 is rotated in the closing direction in a state where the protrusion 24 a of the lid 24 is locked to the housing portion 23, the fixing rib 26 of the battery 1 is released. When the locking portion 24b is inserted between the rear end portion and the housing portion 23 and the release hook H on the mobile phone K side is locked (FIG. 12), the housing portion 2
3 is closed by the lid 24, and the work of attaching the battery 1 to the mobile phone K is completed. In the case of the first embodiment, when the battery 1 is mounted, it is not necessary to fold and store the harness, which simplifies the mounting work. In addition, the fixing ribs 26 of the lid 24 regulate the movement of the battery 1 in the detaching direction to prevent the battery 1 from moving.
Can be securely attached without rattling.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to the drawings of FIGS. 13 and 14. FIG. 13 shows the battery 1 according to the second embodiment.
FIG. 14 shows the appearance of the battery unit 2 before resin molding. The battery 1 of the second embodiment is different from that of the first embodiment in the following points.

In the first embodiment, the connector 7 is provided directly on the circuit board 6, but in the second embodiment, as shown in FIG. 14, the charge control circuit and the short circuit of the circuit board 6 are provided. A harness (lead wire) 31 connected to the hour safety circuit extends from the central portion of the circuit board 6, and a connector 32 is provided at the tip of the harness 31.

Then, as shown in FIG. 13, in the battery 1 of the second embodiment, the tip of the harness 31 away from the circuit board 6 is exposed from the resin mold portion 3. In the second embodiment, the harness 31 and the connector 32 form an electrical connection portion, and most of the harness 31 and the connector 32 are exposed from the resin mold portion 3. Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the same aspect parts and the description thereof will be omitted.

In the battery 1 according to the second embodiment, the resin molding portion 3 includes the harness 31 and the circuit board 6.
Since the connection part with is reinforced, reliability is improved. The other actions and effects are the same as those of the first embodiment, and therefore the description thereof is omitted. Also in the battery 1 of the second embodiment, a hole through which the harness 31 is inserted is provided at the joining portion between the lower mold 10a and the upper mold 10b, so that the first mold
It can be manufactured by the manufacturing method described in the embodiment. In addition, the battery 1 of the second embodiment
Can be attached to a mobile phone having a housing space for the harness 31 and a connector corresponding to the connector 32.

[Third Embodiment] Next, a third embodiment of the present invention will be described with reference to the drawings of FIGS. FIG. 15 shows the battery 1 according to the third embodiment.
16 shows the external appearance of the battery unit 2 and FIG. 16 shows the state of the battery unit 2 before resin molding. The battery 1 of the third embodiment is different from that of the first embodiment in the following points.

In the first embodiment, the connector 7 is provided on the circuit board 6, but in the third embodiment,
As shown in FIG. 16, the connection terminals 33a,
33b and 33c are provided, and these connection terminals 33
a, 33b, 33c are connected to the positive electrode terminal 5a and the negative electrode terminal 5b of the battery cell 5 via the charge control circuit of the circuit board 6 and the short circuit safety circuit. In the third embodiment, the connection terminals 33a, 33b, 33c
Form an electrical connection.

Then, as shown in FIG. 15, in the battery 1 of the third embodiment, the connection terminals 33a, 33b,
33c is exposed from the resin mold portion 3. Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the same aspect parts and the description thereof will be omitted.

The battery 1 of the third embodiment is also
Connection terminals 33 are provided on the inner wall surfaces of the lower mold 10a and the upper mold 10b.
By providing the ribs that come into contact with a, 33b, and 33c, it is possible to manufacture by the manufacturing method described in the first embodiment. Further, the battery 1 of the third embodiment can be mounted on a mobile phone having connection terminals corresponding to the connection terminals 33a, 33b, 33c.

[0041]

As described above, according to the inventions described in claims 1 to 5, since the resin mold portion functions as a reinforcing material, an excellent effect that the rigidity of the battery is improved is exhibited. It Moreover, since the battery cell, the circuit board, and the electrical connection portion are enclosed by the resin mold portion and there is no gap inside, foreign matter does not enter the inside of the battery. In addition, the number of parts of the battery can be reduced, the structure can be simplified, and the battery can be made thin.

Further, in particular, according to the invention described in claim 2, when the battery cell expands due to the temperature rise, it is possible to escape in the portion exposed from the resin mold portion, and the damage of the resin mold portion can be prevented. The effect is that it can be prevented. According to the invention described in claim 6,
Since the battery storage space in the mobile terminal can be reduced, there is an effect that the mobile terminal can be made compact, lightweight and thin.

[Brief description of drawings]

FIG. 1 is a perspective view of a battery according to a first embodiment of the present invention viewed from the front side.

FIG. 2 is a perspective view of the battery according to the first embodiment viewed from the back surface side.

FIG. 3 is a perspective view of the battery unit according to the first embodiment.

FIG. 4 is an exploded perspective view of the battery unit according to the first embodiment.

FIG. 5 is a perspective view showing a mold for manufacturing the battery according to the first embodiment.

FIG. 6 is an exploded perspective view of the battery and the mobile phone according to the first embodiment.

FIG. 7 is a perspective view showing a back side of a lid portion of the mobile phone according to the first embodiment.

FIG. 8 is a perspective view of the mobile phone showing a procedure for attaching the battery according to the first embodiment.

FIG. 9 is a perspective view of the mobile phone showing a procedure for attaching the battery according to the first embodiment.

FIG. 10 is a perspective view of a mobile phone showing a procedure for attaching the battery according to the first embodiment.

FIG. 11 is a perspective view of the mobile phone showing a procedure for attaching the battery according to the first embodiment.

FIG. 12 is a perspective view showing a completed state of the mobile phone after the battery according to the first embodiment is mounted.

FIG. 13 is a perspective view of a battery according to a second embodiment of the present invention.

FIG. 14 is a perspective view of a battery unit according to a second embodiment of the present invention.

FIG. 15 is a perspective view of a battery according to a third embodiment of the present invention.

FIG. 16 is a perspective view of a battery unit according to a third embodiment of the present invention.

[Explanation of symbols]

1 battery 2 Battery unit 3 Resin mold part 5 battery cells 5a Positive terminal 5b Negative electrode terminal 5c surface center 6 circuit board 7 connector (electrical connection) 7a Insertion part (connection end part) 31 harness (electrical connection) 32 connectors (electrical connection) 33a, 33b, 33c Connection terminal (electrical connection part) K mobile phone (mobile terminal)

Claims (6)

(57) [Claims] 1. A battery cell of a laminate pack,
A circuit board electrically connected to each terminal of the battery cell and an electrical connection portion electrically connected to the circuit board are provided, and the battery cell and the circuit board are electrically connected.
A battery unit characterized in that a battery unit formed by electrically connecting the above-mentioned parts to each other is exposed by exposing a connection end part of the electric connection part and molded by resin to be integrated. 2. A part of the battery cell is the molding
The battery according to claim 1, wherein the battery is exposed from a resin mold portion formed by the battery. 3. The electrical connection portion is a connector provided directly on the circuit board.
Alternatively, the battery according to claim 2. 4. The electrical connecting portion includes a lead wire connected to a circuit board and a connector provided at a tip of the lead wire, and the lead wire and the connector are formed by the resin. The battery according to claim 1 or 2, wherein the battery is exposed from the mold part. 5. The battery according to claim 1, wherein the electrical connection portion is a connection terminal provided on a circuit board. 6. A mobile terminal comprising the battery according to any one of claims 1 to 5.