JP2009009734A - Label wound battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To supply a means in which an abnormality of the swelling of a battery pack can be detected easily. <P>SOLUTION: This label wound battery pack has a label 1 wound around a battery body of a rectangular flat shape. A cut-out groove (in the figure, a cut-out groove of a "#-shape") having a prescribed depth and a prescribed length functioning as a swelling detection means is provided on the label 1. Since a breaking mark 1b of a slit shape is formed along the cut-out groove of the label 1 by stress at the time of swelling caused by the deterioration of the battery body, the deterioration of the battery can be easily determined by visually viewing the generation of the breaking mark 1b of the slit shape. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a label-wound battery pack in which a label is wound around the outer surface of a battery unit.

  As electronic devices such as mobile phones become smaller and lighter, there is an increasing demand for smaller and thinner battery packs that are built into electronic devices and used as power sources. For example, rectangular flat battery cells are framed. The battery pack can be easily assembled by reducing the thickness dimension of the battery pack by attaching the battery cell and the outer package with the label. The technology to make is disclosed in Patent Documents 1 to 4 and the like.

  6 and 7 are an external view and an exploded perspective view showing an example of such a conventional label-wound battery pack.

  In the conventional label-wound battery pack, in order to protect the periphery of the side surface of the rectangular flat battery unit 4, the terminal side frame 2 and the finger hook side frame 3 configured in a frame shape are attached to the side surface of the battery unit 4. Further, the terminal side frame 2, the finger hook side frame 3, and the battery unit are wound by sticking the label 10 around the front and back surfaces of the terminal side frame 2 and finger hook side frame 3 and the battery unit 4. 4 is fixed. Therefore, the thickness of the battery pack can be reduced to approximately the thickness of the battery cell 5.

JP 2001-196035 A JP 2004-327378 A JP 2005-327593 A JP 2006-032018 A JP 11-31505 A JP 11-31505 A

  In general, the battery pack has a built-in protection control unit that controls the charge control element when overcharge is detected (see Patent Documents 2 to 4), and when the charging voltage becomes abnormally high, The charge control element is turned off to stop charging. However, when the protection control unit fails and the overcharge detection and protection functions do not operate and the secondary battery is exposed to an overcharged state, the secondary battery is overvoltaged to generate heat and swell. Also, when a failure or the like due to an internal short circuit or an external impact occurs, heat generation or swelling may occur.

When such heat generation or swelling due to battery deterioration or the like occurs, it is difficult to visually detect abnormality of the charging environment or the like by itself unless the battery pack is extremely swollen. As a result, there is a possibility that it may eventually rupture or ignite. FIG. 8 is an external view showing a state in which the label-wound battery pack shown in FIG. 6 is swollen, and FIG. 9 and FIG. FIG. 9 is a side view of the label-wound battery pack shown in FIG. 8 viewed from the A direction and the B direction.

  Conventionally, when cell swelling occurs in this label-wound battery pack, the center portion of the front and back surfaces of the battery pack is raised as shown in FIGS. 9 and 10 and deformed into a via barrel shape. By measuring, it was judged whether or not the swelling was abnormal (battery deterioration). However, the raised dimension α is a small value and it is difficult to measure accurately, and therefore it is not easy to determine battery deterioration by this method.

  Conventionally, in a thin battery using a laminate film as an exterior material, a moisture-proof multilayer film including a resin layer and a metal layer is used as the exterior material. For example, the resin layer disposed on the innermost side of the exterior material has a thickness of A safety valve that has a thin part in the exterior material, such as by inserting a straight cut groove leading to the middle part, so that the cut groove part of the exterior material is torn when the battery internal pressure rises and swells Although a technique for providing a mechanism is disclosed in Patent Documents 5 to 6 and the like, in this case, the tearing of the outer packaging material is substantially the bursting of the battery pack, and when the outer packaging material is cracked, the contents of the battery from the cleavage portion. There is a problem that (electrolyte etc.) flows out to the outside. Therefore, it is insufficient as a method for solving the problem that the deterioration state of the battery cannot be determined until the battery pack is ruptured.

  In view of the above problems, an object of the present invention is to provide means for easily detecting a battery pack swelling abnormality before battery destruction or the like occurs.

  The present invention provides a label-wound battery pack in which a label is wound around a battery body, wherein the label is provided with a notch groove having a predetermined depth and a predetermined length, and the notch is formed in the label by a stress when the battery body is swollen. It is characterized by having blister detection means configured to generate slit-shaped crevices along the groove.

  Further, the label used in the label-wound battery pack of the present invention has the predetermined depth and the predetermined length configured such that a slit-like tear along the cut groove is generated by the stress when the battery body swells. A groove is provided.

  In the swelling detection structure of the battery pack of the mobile phone terminal according to the present invention, the cut groove provided in the label wound around the battery body breaks when the cell of the battery pack swells and becomes a slit, and the battery starts from the tear. When the cell of the unit is exposed, the battery pack can be visually recognized for abnormal expansion, and the user can easily detect the abnormal expansion of the battery pack. Safety can be improved.

  In the present invention, since a slit is formed in the label wound around the cell in the case of an abnormality with respect to the cell bulge and the exposure of the cell can be visually determined, even a general user can easily perform before the battery bursts. It is possible to detect a battery pack swelling abnormality (battery deterioration).

  In addition, since the detection method is provided with a cut groove in the label, it is possible to provide a battery pack swelling abnormality detection means with an inexpensive and easy structure without adding a dedicated detection component.

  Furthermore, by changing the notch groove depth and the notch groove length of the label, it becomes possible to control the degree to which the label is torn, so the level of battery pack swell abnormality can be easily controlled. .

  1 is an external perspective view of a label-wound battery pack showing an embodiment of the present invention, FIG. 2 is an external perspective view of a label used in this embodiment, and FIG. 3 is a cross-sectional view of the label shown in FIG. .

  The label-wound battery pack of this example also has the same configuration as the conventional label-wound battery pack shown in FIGS. 6 to 7 except that the cut groove 1a is formed in the label 1, and is a rectangular flat plate. After attaching the frame-shaped terminal side frame 2 and the finger-hook side frame 3 around the battery-shaped battery unit 4, the battery unit 4 and the terminal-side frame 2 are wrapped around and attached to the outer periphery of the label 1. In addition, the battery pack is configured by fixing the finger hook side frame 3.

  As shown in FIGS. 2 to 3, the label 1 used in the label-wound battery pack of this embodiment has a cut groove 1 a having a predetermined depth and a predetermined length at a predetermined position of the label 1. Is formed. In the embodiment, a configuration in which four cut grooves are arranged in a “#” shape is shown. However, the number and arrangement method of the cut grooves are not limited to the shape shown in the figure. For example, one cut groove is provided. An appropriately shaped cut groove, such as a structure in which two grooves are arranged in an “x” shape, or a structure in which a plurality of cut grooves are arranged in parallel, can be provided on the label 1.

  When the label 1 is wound around the battery unit 4, the rectangular groove is formed by winding the label 1 around the battery unit 4 so that the cut groove 1a formed in the label 1 is on the inner side (battery unit 4 side). A battery pack is configured by fixing the flat battery unit 4, the terminal side frame 2, and the finger hook side frame 3.

  FIG. 4 is an external perspective view showing a state when swelling occurs in the label-wound battery pack of this embodiment, and FIG. 5 is taken along the CC plane of the label winding battery pack shown in FIG. A sectional view and an enlarged view are shown. Hereinafter, the operation of this embodiment will be described with reference to FIGS.

  In the label-wound battery pack shown in FIG. 1, when the cell 5 provided in the battery unit 4 swells due to reasons such as deterioration, the label-wound battery pack is deformed into a via barrel shape as shown in FIGS. . Therefore, when the tensile stress acts on the label 1 as the external appearance of the battery pack and the battery pack bulges beyond the stress capable of maintaining the cut groove 1a, the cut groove 1a breaks to become the slit 1b, and the gap To expose the cell 5 of the battery unit. Therefore, by visually observing that the cut groove 1a of the label 1 is broken and changed to the slit 1b, it is possible to easily confirm that the battery pack has been swollen.

  As shown in FIGS. 4 to 5, the shape of the battery pack when the cell bulge occurs is such that the center of the front and back surfaces of the rectangular flat battery pack is raised and deformed into a via barrel shape. The central part of the front and back surfaces of the pack is deformed the most. Therefore, the position where the cut groove 1a in the label 1 is provided is such that when the label 1 is wound around the outer appearance of the cell 5, the cut groove 1a is provided so as to coincide with the center of the front surface or the back surface of the cell 5. The effect of confirming the swelling of the battery pack can be increased.

It is an external appearance perspective view of the label winding battery pack which shows the Example of this invention. It is an external appearance perspective view of the label used in a present Example. It is CC sectional drawing of the label shown in FIG. It is an external appearance perspective view of the label winding battery pack which shows the operation state of a present Example. It is sectional drawing and the one part enlarged view of the label winding battery pack which show the operation state of a present Example. It is an external appearance perspective view of the conventional label winding battery pack. It is a disassembled perspective view of the conventional label winding battery pack. It is an external appearance perspective view which shows the state which the label winding battery pack shown in FIG. 6 expanded. It is the side view which looked at the label winding battery pack shown in FIG. 8 from the A direction. It is the side view which looked at the label winding battery pack shown in FIG. 8 from the B direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 10 Label 1a Cut groove 1b Slit 2 Terminal side frame 3 Finger hook side frame 4 Battery unit 5 Battery cell

Claims (6)

In a label-wound battery pack in which a label is wound around the battery body,
The label has a notch groove having a predetermined depth and a predetermined length, and has a swollen detecting means configured so that a slit-like tear along the notch groove is generated in the label by the stress when the battery body is swollen. A label-wound battery pack characterized by   The label wound battery pack according to claim 1, wherein a plurality of the cut grooves are provided in the label.   3. The label according to claim 1, wherein the battery body is formed in a rectangular flat plate shape, and the cut groove is provided at a position on the label that substantially coincides with the center of the surface of the battery body. Winding battery pack. A label used for the label-wound battery pack according to claim 1,
A label having a predetermined depth and a predetermined length configured so that a slit-like tear along the cut groove is generated by a stress generated when the battery body swells.   The label according to claim 4, wherein a plurality of the cut grooves are provided. 3. The label according to claim 1, wherein the cut groove is provided so as to be positioned substantially at the center of the surface of the battery body when wound around the battery body having a rectangular flat plate shape.

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