JP2008171726A - Battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack in which a knob piece is suppressed from coming off or being dislocated when the knob piece is pulled since a label is never floated from a unit battery and an overlapping margin on the label can be largely taken because no adhesive layer non-forming portion is generated on the label. <P>SOLUTION: The battery pack 1 is constituted by covering the respective side surfaces of the unit battery 2 with an outer package frame 3 and then by covering two exposed planes of the unit battery 2 and a part of the outer package frame 3 with the label 4 in a state of arranging a protective circuit on one side surface of the unit battery 2. The knob piece 5 is formed in an approximately rectangular shape and equipped with a fixed part pinched and fixed between the rear surface of the unit battery 2 and the label 4, and a tongue-like protruding portion 52 protruding from the rear surface. In the state where the protruding portion 52 is folded on the surface side of the unit battery 2, the battery pack 1 is housed in electronic equipment. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a chargeable / dischargeable non-aqueous electrolyte secondary battery mainly used as a power source of a portable electronic device such as a video camera, a mobile computer, and a mobile phone, specifically a battery pack having a lithium ion secondary battery or the like. .

  In recent years, as power sources for portable electronic devices such as video cameras, mobile computers, and mobile phones, which are rapidly spreading, chargeable / dischargeable rectangular parallelepiped nonaqueous electrolyte secondary batteries such as lithium ion secondary batteries are mainly used. It has been. A lithium ion secondary battery is composed of an electrode group in which a positive electrode and a negative electrode are wound through a separator, and a nonaqueous electrolyte, which are made of aluminum or an aluminum alloy and housed in a rectangular parallelepiped case.

  In one side of this lithium ion secondary battery (unit cell), a protection circuit for controlling the battery voltage to prevent overcharge and overdischarge, and for taking out power from the unit cell or taking in power from the outside A battery core is configured by arranging a circuit board having external output terminals. The circuit board and the unit cell are electrically connected by a connecting lead plate. A battery pack obtained by covering the side surface of the battery core with an insulating outer frame made of, for example, synthetic resin, and further covering the two planes of the unit cell and the outer frame with a label is mounted on the electronic device.

In this battery pack, a claw portion is provided on the outer frame. When removing the battery pack from the electronic device in which the battery pack is stored, after opening the battery cover of the electronic device, the claw portion is gripped and pulled. Some are configured to issue.
However, in the case of this battery pack, the thickness of the battery pack is increased by the amount of the claw, and there is a problem that the battery pack cannot be made thinner.

In view of this, a battery pack has been developed in which a label (picking piece) is provided on the label instead of the claw portion.
14 is a perspective view showing a conventional battery pack 14, FIG. 15 is a plan view showing the battery pack 14, FIG. 16 is a back view showing the battery pack 14, FIG. 17 is a plan view showing the label 8, and FIG. It is a perspective view which shows the laminated structure of.
The battery pack 14 is made of a synthetic resin on each side surface of the unit cell 2 in a state where a protection circuit (not shown) is disposed on one side surface of the square flat unit cell 2, and the rectangular frame-shaped exterior frame 3. And the two exposed flat surfaces of the unit cell 2 and a part of the exterior frame 3 are covered with a label 8.

  One long side of the rectangular main body 81 of the label 8 is provided with a protruding portion 82 that covers a part of one side of the exterior frame 3 and is folded back to the back side of the unit cell 2. A protruding portion 83 that covers a part of the side of the exterior frame 3 that faces the one side and is folded back to the back side of the unit cell 2 and a take-out piece 84 that is gripped and taken out are provided.

As shown in FIG. 18, the label 8 is provided on the other surface of the base material layer 8a, the base material layer 8a made of polyethylene terephthalate (PET), the adhesive layer 8b formed on one surface of the base material layer 8a, And a laminate layer 8c made of a surface layer made of polypropylene (PP) and an adhesive layer.
The label 8 is produced by applying an adhesive to the back surface of the base material layer 8a to form the adhesive layer 8b, and then sticking the laminate layer 8c to the base material layer 8a.
Since the extraction piece 84 touches the user's hand, it is necessary to prevent the adhesive layer 8b from being formed on the extraction piece 84. To delete the adhesive layer 8b of the extraction piece 84, go to the base material layer 8a. In the step of applying the adhesive, not only the back surface of the extraction piece 84 but also the extension 85 (see FIG. 17) of the extraction piece 84 of the main body 81 of the label 8 needs to be removed. A portion 8d is generated, and the take-out piece 84 and the extension portion 85 become the adhesive layer non-forming portion.
After covering the unit cell 2 with the label 8, the battery pack 14 is accommodated in the electronic device in a state where the take-out piece 84 is folded on the surface side of the unit cell 2 as shown in FIGS. 15 and 16.

19 is a plan view showing a conventional battery pack 15 described in Patent Document 1, etc., FIG. 20 is a back view showing the battery pack 15, FIG. 21 is a plan view showing the label 9 and the take-out sheet 10, and FIG. 9 is a perspective view showing a laminated structure of No. 9. In the figure, the same parts as those of the battery pack 14 are denoted by the same reference numerals, and detailed description thereof is omitted.
One long side of the rectangular main body 91 of the label 9 is provided with a protruding portion 92 that covers a part of one side of the exterior frame 3 and is folded back to the back side of the unit cell 2.
The take-out sheet 10 includes a contact portion 10a that is in contact with the other side of the exterior frame 3 that faces the one side, and a first fixing tongue piece 10b that is inserted between the label 9 and the back surface of the unit cell 2. 10b, a second fixing tongue piece 10c inserted between the label 9 and the surface of the unit cell 2, and an extraction tongue piece 10d used for the operation of taking out the battery pack 15 from the electronic device. .

As shown in FIG. 22, the label 9 is provided with a base layer 9a made of PET, an adhesive layer 9b formed on one surface of the base material layer 9a, and a surface layer made of PP. And a laminate layer 9c made of an adhesive layer.
The contact portion 10a of the take-out sheet 10 is brought into contact with the other side of the exterior frame 3, and the first fixing tongue pieces 10b and 10b and the second fixing tongue piece 10c are arranged on the back surface and the front surface of the unit cell 2. Thus, the battery pack 15 is configured by winding the label 9 around the unit cell 2.
And the battery pack 15 is accommodated in an electronic device in the state in which the extraction tongue piece 10d is folded to the surface side of the unit cell 2.
JP 2006-179196 A

In the case of the conventional battery pack 14 described above, there has been a problem that the label 8 floats from the unit cell 2 at the extension portion 85 where the adhesive layer 8b is not formed.
Further, in the case of the battery pack 15, since the overlap margin between the first fixing tongue pieces 10b and 10b and the second fixing tongue piece 10c with the label 9 is small, the extraction sheet 10 is pulled when the extraction tongue piece 10d is pulled. There was a problem that was dislodged or shifted.

  The present invention has been made in view of such circumstances, and a knob piece is sandwiched and fixed between a label and a surface of a unit cell, and is connected to the fixed portion, and is formed from the surface. By having a projecting portion that protrudes, the knob piece is independent from the label, and the adhesive can be easily applied only to the fixing portion, and the adhesive layer non-forming portion is not formed on the label. Therefore, the label does not float from the unit cell, and the allowance for overlapping with the label can be increased by the fixing portion, so that the pulling piece is prevented from being detached or displaced when the protruding portion is pulled. An object is to provide a battery pack.

  Further, in the present invention, when the label is wound around the unit cell so that the end portions overlap each other, the fixing portion is configured to be fixed between a portion other than the portion where the end portions overlap each other and the surface, It aims at providing the battery pack which can suppress an increase in thickness.

  An object of the present invention is to provide a battery pack in which the knob piece has a substantially rectangular shape, so that the knob piece is prevented from being detached or displaced when the protruding portion is pulled. And

  Furthermore, the present invention provides a battery pack in which the fixing part is configured to be wider than the protruding part, so that the pulling piece is prevented from being detached or displaced when the protruding part is pulled. The purpose is to do.

  Another object of the present invention is to provide a battery pack in which the thickness of the portion where the fixing portion and the label overlap is reduced by configuring the portion sandwiching the fixing portion of the label to include only a laminate layer. And

  And since this invention is covered with a laminated layer by comprising so that a character, a symbol, or a figure may be recorded on the surface of a fixing | fixed part, lot no. The wear resistance and alcohol resistance of the indication such as “No. Therefore, an object of the present invention is to provide a battery pack in which the number of parts is reduced.

  A battery pack according to a first aspect of the present invention is a battery pack having a unit cell, a label covering the surface of the unit cell, and a tab piece, wherein the tab piece is sandwiched between the label and the surface. And a fixing portion that is connected to the fixing portion and protrudes in the surface direction from the surface.

Here, the surface refers to the outer surface, and is not limited to the front surface.
In the present invention, since the knob piece is independent of the label, the adhesive can be easily applied only to the fixing portion of the knob piece. Therefore, unlike a conventional battery pack in which a knob piece is extended on the label and an adhesive layer is not formed on the label main body portion connected to the knob piece, the fixed portion is attached to the unit cell and further labeled on the fixed portion. Can be adhered, and the problem that the label floats off the unit cell does not occur.
Further, since the allowance for overlapping with the label can be increased by the fixing portion, it is possible to prevent the knob piece from being detached or displaced when the protruding portion is pulled.

  The battery pack according to a second invention is the battery pack according to the first invention, wherein the label is wound around the unit cell so that ends thereof overlap each other, and the fixing portion is a portion other than a portion where the ends overlap each other. And fixed to the surface.

  In this invention, since the fixing | fixed part is comprised so that it may fix between parts other than the part which edge parts overlap, and the surface, it can suppress the thickness increase of a battery pack.

  A battery pack according to a third invention is characterized in that, in the first or second invention, the knob piece has a substantially rectangular shape.

  In the present invention, since the knob piece is fixed in a substantially rectangular shape, it is further suppressed that the knob piece is detached or displaced when the protruding portion is pulled.

  The battery pack according to a fourth invention is characterized in that, in the third invention, the fixing portion is wider than the protruding portion.

  In the present invention, when the protruding portion is pulled, it is further suppressed that the knob piece is detached or displaced.

  The battery pack according to a fifth invention is the battery pack according to any one of the first to fourth inventions, wherein the label is a base material layer, an adhesive layer formed on one surface of the base material layer, and the other surface of the base material layer. And a portion sandwiching the fixing portion is composed only of the laminate layer.

  In the present invention, the portion of the base material layer and the adhesive layer that overlaps the fixing portion of the knob piece of the label is deleted, so the thickness of this portion is reduced.

  The battery pack according to a sixth aspect of the present invention is the battery pack according to the fifth aspect, wherein characters, symbols or figures are recorded on the surface of the fixed portion.

In the present invention, lot no. Since the characters, symbols or figures for displaying etc. are recorded on the fixed part by printing or the like, and this fixed part is covered with the laminate layer, it is fixed to the unit cell. The wear resistance and alcohol resistance of the indication such as are good.
Lot No. No display label is required, and the number of parts is reduced.

According to the present invention, the knob piece has a fixing portion that is sandwiched and fixed between the label and the surface of the unit cell, and a protruding portion that is connected to the fixing portion and protrudes from the surface. Since the child piece is independent from the label, the adhesive can be easily applied only to the fixed portion, and the adhesive layer non-formed portion is not formed on the label, so the label does not float from the unit cell.
And since the overlap margin with a label can be taken largely by a fixing | fixed part, when pulling a protrusion part, it is suppressed that a knob piece remove | deviates or shift | deviates.

  Further, according to the present invention, when the label is wound around the unit cell so that the end portions overlap each other, the fixing portion is fixed between the portion other than the portion where the end portions overlap each other and the surface, so that the thickness increases. Is suppressed.

  According to the present invention, since the knob piece has a substantially rectangular shape, and the fixing portion is configured to be wider than the protruding portion in a state having the substantially rectangular shape, the protruding portion is pulled. Sometimes, it is further suppressed that the knob piece is detached or displaced.

  In addition, according to the present invention, the portion sandwiching the fixed portion of the label is configured to include only the laminate layer, omitting the base material layer and the adhesive layer, and thus the thickness increase of the battery pack is further suppressed. .

Furthermore, according to the present invention, lot no. Etc., characters, symbols or diagrams for recording are recorded. Since the display is covered with a laminate layer, the display has good wear resistance and alcohol resistance.
Lot No. Thus, the number of parts is reduced.

Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
Embodiment 1 FIG.
1 is a perspective view showing a battery pack 1 according to Embodiment 1 of the present invention, FIG. 2 is a plan view showing the battery pack 1, FIG. 3 is a back view showing the battery pack 1, and FIG. FIG. 5 is a perspective view showing a laminated structure of the labels 4.
The unit cell 2 of the battery pack 1 is a rectangular flat plate, for example, a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery, an electrode group in which a positive electrode and a negative electrode are wound through a separator, and a nonaqueous The electrolyte is housed in a case made of aluminum or aluminum alloy.
In a state where a protective circuit (not shown) is arranged on one side surface of the unit cell 2, each side surface of the unit cell 2 is covered with an exterior frame 3 made of, for example, acrylonitrile butadiene styrene (ABS), and the unit cell 2 is exposed. A battery pack is formed by covering a part of the flat surface and the exterior frame 3 with a label 4.

One long side of the rectangular main body 41 of the label 4 is provided with a protruding portion 42 that covers a part of one side of the outer frame 3 and is folded back to the back side of the unit cell 2. A protruding portion 43 is provided that covers a part of the other side of the exterior frame 3 that faces the one side and is folded back to the back side of the unit cell 2.
For example, the knob piece 5 made of PET has a substantially rectangular shape, a fixing portion 51 that is sandwiched and fixed between the back surface of the unit cell 2 and the label 4, and a tongue piece shape that protrudes in the surface direction from the back surface. Projecting portion 52. An adhesive is applied to the back surface of the fixed portion 51, but no adhesive is applied to the back surface of the protruding portion 52.

As shown in FIG. 5, the label 4 is attached to the other surface of the base material layer 4a, the adhesive layer 4b formed on the one surface of the base material layer 4a, and the base material layer 4a. And a laminate layer 4c made of a surface layer and an adhesive layer.
The label 4 is produced by applying a pressure-sensitive adhesive to one surface of the base material layer 4a to form the pressure-sensitive adhesive layer 4b, and then sticking the laminate layer 4c to the other surface of the base material layer 4a.

After the fixing portion 51 of the knob piece 5 is attached to the back surface of the unit cell 2, the main body 41 of the label 4 is wound around the back surface and the front surface of the unit cell 2, and a part of the one side of the exterior frame 3 is projected. The battery pack 1 is housed in an electronic device (not shown) in a state in which the projecting portion 52 is folded on the surface side of the unit cell 2. (See FIGS. 2 and 3).
When the main body 41 is wound around the back surface of the unit cell 2, one end portion 44 of the main body 41 is overlapped with the other end portion 45, but the fixing portion 51 is affixed to the back surface of the unit cell 2 while avoiding this overlapping portion. Is done.
The battery pack 1 is easily taken out from the stored electronic device by pulling the protruding portion 52 of the knob piece 5.

  In the present embodiment, since the knob piece 5 is independent of the label 4, it is possible to easily apply the adhesive only to the fixing portion 51 of the knob piece 5. Therefore, unlike the conventional battery pack 14 in which the extraction piece 84 is extended from the main body 81 of the label 8 and the adhesion layer 8b is not formed on the main body 81 connected to the extraction piece 84, the label 4 is not formed with the adhesion layer 4b. Part does not occur. And after sticking the fixing | fixed part 51 to the unit cell 2, since the main body 41 of the label 4 is stuck so that the fixing | fixed part 51 may be covered, the label 4 does not float from the unit cell 2. FIG.

Moreover, since the fixing | fixed part 51 is rectangular shape and the overlap allowance with the main body 41 of the label 4 can be taken large, when pulling the protrusion part 52, it is suppressed that the knob piece 5 remove | deviates or shift | deviates. Has been.
And since the fixing | fixed part 51 is comprised so that it may fix between the part other than the part which edge parts overlap, and the surface of the unit cell 2, the increase in the thickness of a battery pack is suppressed.

Embodiment 2. FIG.
FIG. 6 is a plan view showing a knob piece 6 provided in the battery pack according to Embodiment 2 of the present invention.
This battery pack has the same configuration as that of the battery pack 1 according to Embodiment 1 except that the tab 6 is different.
The knob piece 6 has a substantially rectangular shape, a fixing portion 61 that is sandwiched and fixed between the back surface of the unit cell 2 and the label 4, and a tongue-like projection unit 62 that projects from the surface of the unit cell 2. And. In the knob piece 6, the fixing portion 61 is formed wider than the protruding portion 62.

  In the present embodiment, when the protruding portion 62 is pulled, it is further suppressed that the knob piece 6 is detached or displaced.

Embodiment 3 FIG.
7 is a plan view showing the battery pack 11 according to Embodiment 3 of the present invention, FIG. 8 is a back view showing the battery pack 11, FIG. 9 is a plan view showing the label 7 and the knob piece 5, and FIG. 10 is a label. 7 is a perspective view showing a laminated structure of FIG. In the figure, the same parts as those of the battery pack 1 according to Embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  One long side of the rectangular main body 71 of the label 7 is provided with a projecting portion 72 that covers a part of one side of the exterior frame 3 and is folded back to the back side of the unit cell 2. A protruding portion 73 is provided that covers a part of the other side of the exterior frame 3 facing the one side and is folded back to the back side of the unit cell 2.

As shown in FIG. 10, the label 7 is attached to the other surface of the base material layer 7a, the adhesive layer 7b formed on the one surface of the base material layer 7a, and the base material layer 7a. And a laminate layer 7c made of a surface layer and an adhesive layer.
As shown in FIGS. 9 and 10, the portion sandwiching the fixing portion 52 of the main body 71 is a base material layer non-forming portion 74 that does not have the base material layer 7a and the adhesive layer 7b.
The label 7 is applied to the one surface of the base material layer 7a to form the adhesive layer 7b, and then the laminate layer 7c is attached to the other surface of the base material layer 7a to correspond to the base material layer non-forming part 74. It is obtained by half-cutting the laminated layer 7c for the part to be made.

  After the fixing part 51 of the knob piece 5 is adhered to the back surface of the unit cell 2, the label 7 is attached to the back surface and the surface of the unit cell 2 in a state where the fixing unit 51 is covered with the base material layer non-forming part 74. The main body 71 is wound so that one end portion 75 is overlapped with the other end portion 76, a part of the one side of the exterior frame 3 is covered by the protruding portion 42, and a part of the other side is covered by the protruding portion 43. After covering, the battery pack 11 is accommodated in an electronic device (not shown) in a state in which the protruding portion 52 is folded on the surface side of the unit cell 2 (see FIGS. 7 and 8).

  According to the present embodiment, since the base material layer 7a and the adhesive layer 7b are deleted in the base material layer non-forming part 74 that overlaps the fixing part 52 of the knob piece 5 of the label 7, the thickness is accordingly increased. Has been reduced. At this time, since the base material layer non-forming part 74 is adhered to the back surface of the unit cell 2 by the adhesive layer of the laminate layer 7c, the fixing unit 51 is firmly fixed to the unit cell 2, and the label 7 Will not float.

Embodiment 4 FIG.
11 is a plan view showing the battery pack 12 according to Embodiment 4 of the present invention, FIG. 12 is a back view showing the battery pack 12, and FIG. 13 is a plan view showing the knob piece 5. FIG. In the figure, the same parts as those of the battery pack 1 according to the first embodiment and the battery pack 11 according to the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the fixing part 51 of the knob piece 5 according to the present embodiment, the Lot. A lot display 53 indicating No is printed.

Since the base material layer non-forming part 74 of the label 7 is composed only of the laminating layer 7c, and this laminating layer 7c is transparent, as shown in the rear view of FIG. The lot display 53 of the part 51 is visually recognized from the outside.
Since the lot display 53 is covered with the laminate layer 74 as described above, the wear resistance and alcohol resistance are good.
Further, unlike the conventional battery pack, it is not necessary to attach a label for lot display, and the number of parts is reduced.
In the present embodiment, the case where the lot display 53 is printed on the fixed portion 51 of the knob piece 5 is described. However, the present invention is not limited to this, and other characters, A symbol or a figure may be displayed, and the method of recording on the fixing unit 52 is not limited to printing.

In the first to fourth embodiments, the case where the unit cell 2 has a rectangular flat plate shape has been described. However, the present invention is not limited to this.
In the first to fourth embodiments, the case where the knob piece 5 has a substantially rectangular shape or the protruding portion 52 has a convex shape narrower than the fixed portion 51 is described, but the present invention is not limited thereto. Instead, the shape of the knob piece 5 may be an ellipse or the like, and the shape of the protrusion 52 is not limited to the tongue shape.

In the first to fourth embodiments, the case where the fixing portion 51 of the knob piece 5 is inserted and fixed between the flat surface of the unit cell 2 and the label 4 or 7 is described. Without being limited, when the flat surface of the unit cell 2 is covered with a synthetic resin case, and this case is further covered with a label, the fixing portion 51 is inserted between the case and the label. May be fixed.
Further, the manufacturing method of the labels 4 and 7 is not limited to the method described in the first and third embodiments, and after the adhesive layers 4b and 7b are formed by silk printing or the like, the base material layers 4a and 7a are formed. The laminate layers 4c and 7c may be laminated.

It is a perspective view which shows the battery pack which concerns on Embodiment 1 of this invention. It is a top view which shows a battery pack. It is a reverse view which shows a battery pack. It is a top view which shows a label and a knob piece. It is a perspective view which shows the laminated structure of a label. It is a top view which shows the knob piece with which the battery pack which concerns on Embodiment 2 of this invention is equipped. It is a top view which shows the battery pack which concerns on Embodiment 3 of this invention. It is a reverse view which shows a battery pack. It is a top view which shows a label and a knob piece. It is a perspective view which shows the laminated structure of a label. It is a top view which shows the battery pack which concerns on Embodiment 4 of this invention. It is a reverse view which shows a battery pack. It is a top view which shows a knob piece. It is a perspective view which shows the conventional battery pack. It is a top view which shows a battery pack. It is a reverse view which shows a battery pack. It is a top view which shows a label. It is a perspective view which shows the laminated structure of a label. It is a top view which shows the conventional battery pack described in patent document 1 grade | etc.,. It is a reverse view which shows a battery pack. It is a top view which shows a label and a taking-out sheet | seat. It is a perspective view which shows the laminated structure of a label.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11, 12 Battery pack 2 Unit cell 3 Exterior frame 4, 7 Label 41, 71 Main body 42, 43, 72, 73 Projection part 44, 75 One end part 45, 76 Other end part 74 Base material layer non-formation part 4a , 7a Base material layer 4b, 7b Adhesive layer 4c, 7c Laminating layer 5, 6 Picking piece 51, 61 Fixed part 52, 62 Protruding part 53 Lot display

Claims (6)

In a battery pack having a unit cell, a label covering the surface of the unit cell, and a knob piece,
The pick piece is
A fixing part that is sandwiched and fixed between the label and the surface;
A battery pack comprising: a protruding portion that is connected to the fixing portion and protrudes in a plane direction from the surface. The label is wound around the unit cell so that the ends overlap each other,
The battery pack according to claim 1, wherein the fixing portion is fixed between a portion other than a portion where the end portions overlap each other and the surface.   The battery pack according to claim 1, wherein the knob piece has a substantially rectangular shape.   The battery pack according to claim 3, wherein the fixing portion is wider than the protruding portion. The label comprises a base material layer, an adhesive layer formed on one surface of the base material layer, and a laminate layer adhered to the other surface of the base material layer,
The battery pack according to any one of claims 1 to 4, wherein a portion sandwiching the fixing portion is composed only of the laminate layer.   The battery pack according to claim 5, wherein characters, symbols, or drawings are recorded on the surface of the fixed portion.

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