JP2010277692A - Battery pack and battery pack intermediate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-profile battery pack with a plurality of laminate cells arrayed and stored in the outer case, having reduced thickness and weight while securing dimensional stability. <P>SOLUTION: The low-profile battery pack 1 includes a flat battery pack intermediate 10 mounted in the storage region of a bottom case 20 of a notebook computer. The battery pack intermediate 10 consists of a core pack 11, a metal cover plate 12 covering the upper face of the core pack 11, and an insulating sheet 13 covering the lower face of the core pack 11. The core pack 11 includes the plurality of laminate cells 41-46 and a circuit board 50 arranged inside an insulating frame body 30 along the flat surface. Over the entire outer periphery of the metal cover plate 12, an outer periphery side plate portion 12a is formed by bending an edge portion downward. The insulating frame body 30 is set inside the outer periphery side plate portion 12a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a battery pack, and more particularly to a thin battery pack incorporating a plurality of laminated batteries.

In recent years, with the spread of mobile devices such as mobile phones, secondary batteries are widely used as these power sources. Among portable devices, in particular, in notebook computers, a battery pack in which a plurality of secondary batteries are connected in a multi-dash arrangement and housed in an exterior body together with a circuit board is built in as a power source.
By the way, along with the thinning of notebook computers, there is a demand for thinning of the battery pack incorporated therein, and in order to meet this demand, a thin and lightweight laminated battery (a lithium polymer battery with a laminated exterior) having a high energy density is required. It is used. A thin pack battery in which a plurality of laminate batteries are arranged and accommodated in an outer case has also been devised.

For example, a thin and light battery pack can be constructed by covering a plurality of laminated batteries with an exterior film, but if the internal pressure of the laminate battery rises depending on use conditions, the exterior film tends to swell and deform, It is difficult to stabilize.
On the other hand, as shown in FIG. 6, in the thin battery pack disclosed in Patent Document 1, a plurality of laminated batteries 101 are inserted into a rectangular frame 104 having an outer frame 104a and an intermediate frame 104b. The first metal plate 105 and the second metal plate 106 are arranged together with the terminal substrate 102. The frame body 104 is provided with a locking groove 111 on the outer peripheral surface of the outer frame 104a, and the edges of the first metal plate 105 and the second metal plate 106 are bent inward along the surface of the frame body 104, The leading edge is locked in the locking groove 111.

  In such a battery pack, the plurality of laminated batteries 101 are housed in a case formed by the first metal plate 105, the second metal plate 106, and the frame body 104. The surface is protected by a metal plate and has excellent dimensional stability.

JP 2004-356027 A JP 2004-273174 A JP-A-2005-85543 JP 2006-216517 A

However, there is a demand for further thinning in portable devices such as notebook computers, and accordingly, it is desired to make the thin pack battery thinner and lighter.
The present invention has been made in view of the above problems, and in a thin pack battery in which a plurality of laminated batteries are arranged and housed in an outer case, it is thinner and lighter while ensuring dimensional stability. With the goal.

  In order to achieve the above object, in the battery pack according to the present invention, an insulating frame on one plane, and a core pack in which a plurality of laminated batteries and a circuit board are arranged inside the insulating frame, And a metal plate that covers one main surface of the core pack, and stores the other main surface of the core pack directly opposite the inner bottom surface in a storage area provided on the inner bottom surface of the device body case. The exterior case that protects the plurality of laminated batteries and the circuit board by the storage area portion of the device body case and the metal plate is configured.

When the bottom surface of the device body case is rectangular, it is preferable to arrange a plurality of laminated batteries in a state along the entire length of the long side of the bottom surface.
It is preferable that the insulating frame is formed of resin, the outer peripheral edge of the metal plate is bent, and the outer periphery of the insulating frame is surrounded by the bent portion.
In order to achieve the above object, in the battery pack intermediate of the present invention, an insulating frame is formed on one plane, and a plurality of laminated batteries and a circuit board are arranged inside the insulating frame. When the core pack and a metal plate that covers one main surface of the core pack are provided and the other main surface of the core pack is stored directly opposite to the inner bottom surface, the storage area portion of the device body case In addition, an exterior case for protecting a plurality of laminated batteries and a circuit board is formed by the metal plate.

  In the battery pack intermediate body, it is preferable that an insulating sheet that covers the other main surface of the core pack is further provided, and the outer peripheral portions of the metal plate, the core pack, and the insulating sheet are fixed with a tape.

  According to the battery pack of the present invention, the insulating frame constituting the core pack, the plurality of laminated batteries, and the circuit board are arranged on one plane, so that the thickness is basically thin, and the core By covering one main surface of the pack with a metal plate and storing the other main surface of the core pack directly facing the inner bottom surface in a storage area provided on the inner bottom surface of the device body case, a plurality of The laminated battery and the circuit board are sandwiched and protected by a metal plate and a device body case.

In this way, the device main body case also serves as a part of the outer case that protects the plurality of laminated batteries and the circuit board, and therefore, compared with the thin pack battery in which the laminated battery is sandwiched between the two metal plates according to the above-described conventional technology. However, the thickness is reduced and the weight is reduced.
In addition, since the periphery of the laminate battery and the circuit board is surrounded and held by an insulating frame body, the effect of maintaining the overall shape is high compared with the case where a plurality of laminate batteries are fixed by tape winding, and the thickness Can also be reduced.

In addition, the same effect can be obtained in the battery pack intermediate of the present invention.
In the present invention, when the bottom surface of the device body case is rectangular, if a plurality of laminated batteries are arranged along the entire length of the long side of the bottom surface of the device body case, the plurality of laminated batteries are stabilized by the insulating frame. Can be held.
If the insulating frame is formed of resin, it is easy to fit a plurality of laminated batteries and circuit boards into the insulating frame when assembling the battery pack. Further, if the outer peripheral edge portion of the metal plate is bent and the bent portion surrounds the outer periphery of the insulating frame, the dimensional stability is excellent even if the insulating frame is formed of resin.

  In the battery pack intermediate body, an insulating sheet covering the other main surface of the core pack is further provided, and the outer periphery of the metal plate, the core pack, and the insulating sheet is fixed with a tape. Since it is sandwiched, even when the laminated battery is about to swell, the swell is suppressed.

It is a perspective view which shows the structure of the thin pack battery which concerns on embodiment. FIG. 2 is an assembly diagram of an intermediate body of the battery pack shown in FIG. 1. FIG. 3 is an assembly diagram of the core pack shown in FIG. 2. It is the schematic sectional drawing which cut | disconnected the thin battery pack 1 shown in FIG. 1 by the YZ surface. It is the schematic sectional drawing which cut | disconnected the thin battery pack 1 shown in FIG. 1 by the XZ surface. It is a perspective view which shows the structure of the thin pack battery which concerns on a prior art.

Embodiments of the present invention will be described with reference to the drawings.
For the sake of explanation, in each figure, the direction indicated by the arrow X is defined as the forward direction, the direction indicated by the arrow Y is defined as the horizontal direction (rightward), and the direction indicated by the arrow Z is defined as the upward direction.
FIG. 1 is a perspective view showing an overall configuration of a thin battery pack 1 according to an embodiment.
As shown in FIG. 1, the thin battery pack 1 is configured by mounting a flat battery pack intermediate body 10 in a storage area of a bottom case 20 of a notebook personal computer serving as an electronic device main body. It will be.

As shown in FIG. 1, the bottom case 20 is a rectangular dish-shaped member.
The bottom case 20 includes a bottom plate portion 21 formed of a rectangular flat plate along the XY plane, and outer peripheral side wall portions 22a to 22d provided by bending upward from the four outer sides of the bottom plate portion 21, and the bottom plate portion On the 21, partition walls 23 a to 23 e are provided.
The upper surface of the bottom plate portion 21 is partitioned by the partition walls 23a to 23e, and a region surrounded by the partition walls 23a to 23e and the outer peripheral side wall portions 22a, 22c, and 22d is a storage region for storing the battery pack intermediate body 10. . This storage area has substantially the same shape as the battery pack intermediate 10 so that the battery pack intermediate 10 is just inserted.

  As shown in FIG. 4, the battery pack intermediate 10 is attached by being attached to the upper surface of the storage area of the bottom plate portion 21 with the double-sided tape 16. It is designed to serve as part of the exterior case. An exterior case that protects the plurality of laminated batteries and the circuit board is configured by the storage region portion of the device main body case and the metal plate.

Such a bottom case 20 is generally produced by injection molding a resin, but may be produced by molding a metal material.
The notebook computer includes an upper lid case (not shown) on the bottom case 20, and a main body circuit board (not shown) in addition to the thin battery pack 1 in the main body case including the bottom case 20 and the upper lid case. A storage device, a keyboard, and the like are stored. This keyboard is disposed immediately above the thin pack battery 1.

(Pack battery intermediate 10)
The shape of the battery pack intermediate body 10 is composed of a long rectangular portion 10a that is long in the lateral direction and a rectangular protruding portion 10b that protrudes forward from the central portion of the long portion 10a. The lateral length is substantially the same as the lateral length of the bottom case 20, but the lateral length of the protrusion 10b is shorter than this.

FIG. 2 is an assembly diagram illustrating the configuration of the battery pack intermediate 10.
The battery pack intermediate body 10 includes a core pack 11, a metal cover plate 12 that covers the upper surface of the core pack 11, and an insulating sheet 13 that covers the lower surface of the core pack 11.
The core pack 11, the metal cover plate 12, and the insulating sheet 13 are all flat plates along the XY plane, and have the same shape as the battery pack intermediate body 10 described above. As shown in FIG. 1, the outer peripheral portion is fixed with an adhesive tape 15 to constitute a battery pack intermediate 10.

The core pack 11 includes a plurality of (six) laminated batteries 41 to 46 and a circuit board 50 arranged along the XY plane inside the insulating frame 30 along the XY plane.
FIG. 3 is an assembly diagram of the core pack 11.
The shape of the insulating frame 30 is the same as the shape of the battery pack intermediate body 10 described above, and the main configuration is a frame portion that is located on the outer periphery without a bottom surface, and is a rectangle that is long in the horizontal direction. The long frame body portion 30a and a rectangular projecting frame body portion 30b projecting forward from the central portion of the long frame body portion 30a are formed entirely of resin.

The long frame body portion 30a includes four frame sides (long frame sides 31 and 32 extending in the horizontal direction and short frame sides 33 and 34 extending in the front-rear direction), and five laminated batteries 41 to 41 are provided on the inner side. With 45 facing the same direction, they can be stably mounted side by side in the horizontal direction.
The projecting frame 30b is composed of frame sides 35, 36, and 37 that extend forward from the center of the frame side 31, and a frame side 38 that extends in the lateral direction so as to connect the front ends thereof. The battery 46 and the circuit board 50 can be mounted side by side in the horizontal direction.

The metal cover plate 12 is formed by molding a metal plate (for example, a SUS304 plate having a thickness of 0.15 mm). As shown in FIG. 2, the edge portion is folded downward over the entire outer periphery of the metal cover plate 12. The outer peripheral side plate portion 12a is formed by being bent. The insulating frame 30 is fitted inside the outer peripheral side plate portion 12a.
4 is a schematic cross-sectional view of the thin battery pack 1 shown in FIG. 1 cut along the YZ plane. FIG. 5 is a schematic cross-sectional view of the thin battery pack 1 cut along the XZ plane.

As shown in FIGS. 4 and 5, the frame sides 33 and 34 of the insulating frame 30 are fitted inside the outer peripheral side plate portion 12 a of the metal cover plate 12.
Each of the laminate batteries 41 to 46 is formed by sandwiching an electrode body between folded laminate films and hermetically sealing the outer periphery of the film by welding or the like. A polymer battery is used as .about.46.

As shown in FIG. 3, each laminated battery 41-46 is rectangular shape, The negative electrode terminals 41a-46a and the positive electrode terminals 41b-46b are attached on the short side.
Each of the five laminated batteries 41 to 45 is fitted over the frame side 31 and the frame side 32 of the long frame body 30a with the negative terminals 41a to 45a and the positive terminals 41b to 45b facing forward. It is. The laminate battery 46 is fitted over the frame side 35 and the frame side 36 of the projecting frame 30b with the negative electrode terminal 46a and the positive electrode terminal 46b facing leftward. Here, an insulating spacer 47 is interposed between the adjacent laminated batteries 41 to 46 (see FIG. 4).

Instead of interposing the insulating spacer 47, an intermediate frame for partitioning adjacent laminated batteries 41 to 45 may be provided in the long frame body portion 30a. However, it is more space efficient to interpose the insulating spacer 47. It can be increased, and it can cope with variations in the sizes of the laminated batteries 41 to 45.
A double-sided tape 14 a is attached to the upper surface side of the laminate batteries 41 to 45, and a double-sided tape 14 b is also attached to the upper surface of the laminate battery 46. The upper surfaces of the laminated batteries 41 to 46 and the lower surface of the metal cover plate 12 are bonded by the double-sided tapes 14a and 14b.

Moreover, the double-sided tape 13a (refer FIG. 4) is affixed also to the lower surface side of the laminated batteries 41-46, and the lower surface of the laminated batteries 41-46 and the upper surface of the insulating sheet 13 are adhere | attached by this double-sided tape 13a.
The circuit board 50 has a rectangular shape and is fitted and mounted so as to straddle the frame side 36 and the frame side 37 of the protruding frame body portion 30b. The insulating frame 30 is provided with an insulating cover portion 39 extending between the frame side 36 and the frame side 37, and the circuit board 50 is mounted on the lower side of the insulating cover portion 39.

On the circuit board 50, electronic components that realize a protection circuit for protecting the laminated batteries 41 to 46 are mounted. This protection circuit is a circuit that controls the charge / discharge current to prevent the laminated batteries 41 to 46 from being overcharged or overdischarged, a circuit that detects the overcurrent and interrupts the current, and the laminated batteries 41 to 46 are at an abnormally high temperature. A circuit that cuts off the current when the
Further, on the upper surface of the circuit board 50, a positive input terminal 51a for inputting power from the laminated batteries 41 to 46, a negative input terminal 51b, intermediate terminals 52a and 52b for inputting an intermediate voltage of the battery pack, and a notebook A connector 53 for outputting to the personal computer main body is provided.

The connector 53 passes through the notch 39a formed in the insulating cover part 39 and the notch 12b formed in the metal cover plate 12, and is exposed on the upper surface of the battery pack intermediate 10 as shown in FIG.
The connector 53 is connected to a plug (not shown) connected to the circuit board of the notebook personal computer.

Further, a thermistor element 54, which is a heat sensitive element, is attached to the circuit board 50. The thermistor element 54 penetrates through a notch 39b formed in the insulating cover portion 39, and as shown in FIG. The part is fixed at a position suitable for measuring the temperature of the laminated batteries 41 to 46.
(Connection of laminated battery and circuit board)
The six laminated batteries 41 to 46 are connected in series 3 in parallel by power buses 61 to 64 in which an insulating film is laminated on a metal plate conductor, and both ends thereof are connected to the positive input terminal 51a of the circuit board 50 and negative. It is connected to the input terminal 51b. Then, power is supplied from the laminated batteries 41 to 46 to the circuit board of the notebook personal computer via the power buses 61 to 64, the circuit board 50, and the connector 53.

Specifically, each power supply bus 61 to 64 is connected to each terminal as follows.
The power bus 61 extends linearly in the horizontal direction and connects the positive terminals 41b and 42b. The positive terminal 61a provided in the power supply bus 61 passes through the notch 39c formed in the insulating cover part 39 and is connected to the positive input terminal 51a.
The power supply bus 62 extends in a straight line in the lateral direction and connects the negative terminals 41a and 42a and the positive terminals 44b and 45b. The intermediate terminal 62a provided in the power supply bus 62 passes through the notch 39c and passes through the intermediate terminal 62a. It is connected to the terminal 52a.

The power supply bus 63 extends in an L shape in the lateral direction and the front-rear direction, and connects the negative terminals 44 a and 45 a and the positive terminals 43 b and 46 b, and the intermediate terminal 63 a provided in the power supply bus 63 is connected to the insulating cover portion 39. The cutout 39b formed is connected to the intermediate terminal 52b.
The power supply bus 64 extends in an L shape in the lateral direction and the front-rear direction, and connects the negative terminals 43a and 46a. The negative terminal 64a provided in the power supply bus 64 passes through the notch 39b and is a negative input terminal. 51b. The two cells at both ends are connected in parallel, the two cells at the center are connected in parallel, and these are connected in series.

(Manufacturing method of thin pack battery 1)
The thin pack battery 1 can be manufactured as follows.
(1) Laminate batteries 41 to 46 are arranged on a plane while interposing insulating spacers 47, and double-sided tapes 13a, 14a, and 14b are attached thereto. Further, the power buses 61 to 64 are connected to the terminals of the laminated batteries 41 to 46.
(2) The laminated batteries 41 to 46 and the circuit board 50 are fitted into the insulating frame 30, and the terminals 61a to 64a of the power buses 61 to 64 and the terminals 51a, 52c, 52b of the circuit board 50, The core pack 11 is produced by connecting 51b.
(3) The battery pack intermediate body 10 is produced by attaching the metal cover plate 12 to the upper surface of the core pack 11 and the insulating sheet 13 to the lower surface and fixing the outer peripheral portion with the adhesive tape 15.
(4) The thin battery pack 1 is produced by attaching the battery pack intermediate 10 to the storage area of the bottom case 20 via the double-sided tape 16.

(Effect of thin battery pack 1)
In the thin battery pack 1 of this embodiment, since the insulating frame 30, the laminated batteries 41 to 46, and the circuit board 50 are arranged on one plane, the thickness can be reduced.
In the notebook personal computer main body, a keyboard is disposed immediately above the thin battery pack 1, but the upper surfaces of the laminated batteries 41 to 46 and the circuit board 50 are covered with the metal cover plate 12. Protected by.

On the other hand, the lower surfaces of the laminate batteries 41 to 46 and the circuit board 50 are in contact with the bottom plate portion 21 via the insulating sheet 13 and there is no metal plate, but the bottom plate portion 21 has strength, so The lower surfaces of the batteries 41 to 46 and the circuit board 50 are also protected.
As described above, there is no metal plate on the lower surface side of the thin battery pack 1, and the bottom plate portion 21 functions as an outer case of the thin battery pack 1, so that the laminated battery is sandwiched between the two metal plates described in the prior art. Compared with the thin battery pack, the thickness is further reduced and the weight is reduced.

Further, in the battery pack intermediate 10, the laminate batteries 41 to 46 are sandwiched between the metal cover plate 12 and the insulating sheet 13 and the outer periphery thereof is fastened with the adhesive tape 15, so that the laminate batteries 41 to 46 are swollen. Even when trying to do so, the swelling is suppressed.
In addition, since the laminated batteries 41 to 46 and the circuit board 50 are inserted and held in the insulating frame 30, the function of holding the entire shape is high, and a plurality of batteries are fixed by tape winding. The thickness can also be reduced compared to

  Further, since the insulating frame 30 is made of resin, the laminated batteries 41 to 46 and the circuit board 50 can be easily mounted by elastically deforming the insulating frame 30 when the battery pack intermediate 10 is assembled. . On the other hand, after the battery pack intermediate body 10 is assembled, the outer periphery of the insulating frame 30 is surrounded by the outer peripheral side plate 12a, so that it is difficult to deform and has excellent dimensional stability.

(Variations, etc.)
In the above embodiment, the example in which six laminated batteries and one circuit board are inserted into the insulating frame 30 has been shown. However, the number of laminated batteries to be inserted into the insulating frame can be any number of two or more. The same can be done with numbers. Further, the number of circuit boards to be embedded in the insulating frame is not limited to one, and two or more circuit boards can be similarly implemented.

  In the above embodiment, the thin pack battery built in the notebook computer has been described. However, the present invention can be applied to a thin pack battery built in a general portable electronic device.

  According to the pack battery intermediate and the pack battery according to the present invention, since the thickness of the pack battery can be reduced, it is suitable as a power source for portable devices such as thin laptop computers.

DESCRIPTION OF SYMBOLS 1 Thin battery pack 10 Pack battery intermediate body 11 Core pack 12 Metal cover board 12a Outer peripheral side plate part 13 Insulation sheet 15 Adhesive tape 20 Bottom case 21 Bottom plate part 22a-22d Outer peripheral side wall part 23a-23e Partition 30 Insulating frame 30a Long Frame body portion 30b Projection frame body portion 41 to 46 Laminated battery 41a to 46a Negative electrode terminal 41b to 46b Positive electrode terminal 47 Insulating spacer 50 Circuit board 61 to 64 Power supply bus

Claims (5)

On one plane, an insulating frame, and a core pack in which a plurality of laminated batteries and a circuit board are arranged inside the insulating frame,
A metal plate covering one main surface of the core pack;
In the storage area provided on the inner bottom surface of the device body case, the other main surface of the core pack is stored directly facing the inner bottom surface,
A battery pack characterized in that an outer case for protecting the plurality of laminated batteries and the circuit board is constituted by a housing region portion of the device main body case and the metal plate. The bottom surface of the device body case is rectangular,
2. The battery pack according to claim 1, wherein the plurality of laminated batteries are arranged along the entire length of the long side of the bottom surface. The insulating frame is formed of resin;
3. The battery pack according to claim 1, wherein an outer peripheral edge portion of the metal plate is bent, and the bent portion surrounds an outer periphery of the insulating frame. On one plane, an insulating frame, and a core pack in which a plurality of laminated batteries and a circuit board are arranged inside the insulating frame,
A metal plate covering one main surface of the core pack;
When the other main surface of the core pack is stored directly opposite to the inner bottom surface in the storage region provided on the inner bottom surface of the device main body case, the storage region portion of the device main body case and the metal A battery pack intermediate comprising an outer case for protecting the plurality of laminated batteries and the circuit board by a plate. Furthermore, it has an insulating sheet that covers the other main surface of the core pack,
The battery pack intermediate according to claim 4, wherein outer peripheral portions of the metal plate, the core pack, and the insulating sheet are fixed with a tape.

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