JPH0310612Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an assembled battery formed by collecting a plurality of flat unit cells.

For example, LR44 button type alkaline batteries, etc.
Although they are often used alone, they are often assembled into so-called assembled batteries, in which a plurality of batteries are assembled in series to obtain a desired electromotive force. For example, the electromotive force per LR type button alkaline battery is about 1.5V, but by collecting four of these batteries, an assembled battery with an electromotive force of 6V can be constructed. FIG. 1 shows an example of such an assembled battery. The assembled battery shown in the figure is loaded with flat unit cells 10 stacked in series in a cylindrical metal exterior body 12, and between the outer surface of each unit cell 10 and the inner surface of the exterior body 12. A cylindrical insulating isolation member 14 is interposed therebetween.

In conventional battery packs of this kind, a heat-shrinkable tube or a rigid middle tube made of paraffin is generally used as the insulating isolation member 12. However, heat-shrinkable tubes have problems such as relatively high material costs, limited dimensional flexibility, and the difficulty of uniformly shrinking the cell stack without changing its shape. had. The dimensional flexibility of heat-shrinkable tubes is small because if the dimensions are small, it is difficult to insert the unit cells before shrinking.
On the other hand, if the size becomes large, it becomes impossible to reliably cover the stack of unit cells after shrinking. Therefore, in order to use this heat-shrinkable tube as the insulating isolation member 14, a heat-shrinkable tube with a different diameter must be prepared for each of the dimensions of the unit cell 10, especially the external dimensions, which is a hassle. occurs. Further, even when using a rigid inner cylinder made of cardboard or the like fried in paraffin, consideration must be given to the fit between the metal exterior body 12 and the unit cell, and therefore the flexibility in its dimensions is still small. Moreover, such a paraffin fried inner tube has the disadvantage that the manufacturing process is troublesome and tends to be expensive.

As described above, this type of assembled battery generally has the disadvantage that it is troublesome to manufacture and assemble and tends to be expensive.

This idea was made in view of the above-mentioned conventional problems, and its purpose is to make it possible to form the insulation isolation member at a relatively low cost, and in particular, to have great dimensional flexibility and thinning of the insulation isolation member. The object of the present invention is to provide an assembled battery that has excellent operability in the manufacturing and assembly process and has improved volumetric efficiency.

In order to achieve the above object, this invention includes a flat unit battery 10 consisting of a plurality of alkaline batteries,
An assembled battery having a cylindrical metal exterior body 12 with both ends open and a cylindrical insulating isolation member 14, the insulating isolation member 14 being impermeable to water and having self-restoring elasticity in the direction of deployment. The insulating isolation member 14 is a polyethylene sheet piece 26.
and paper 28 laminated thereon, a plurality of flat unit cells 10 are connected in series and loaded into the exterior body 14, and the insulating isolation member 14 is connected to the flat cell 10. Plain battery 10 and the exterior body 1
It is characterized by being interposed between 2 and 2.

Hereinafter, preferred embodiments of this invention will be described based on the drawings. In the following explanation, FIG. 1 will be referred to, and common or corresponding parts in each figure will be denoted by the same reference numerals.

FIGS. 1 and 2 show an embodiment of an assembled battery according to this invention. The assembled battery shown in the figure is basically the same as the conventional one described above. That is, the flat unit cells 10, such as button-type alkaline batteries, are stacked in series and loaded into the cylindrical metal exterior body 12, and the outer surface of each unit cell 10 and the inner surface of the exterior body 12 are connected to each other. It is constructed by interposing a cylindrical insulating isolation member 14 between them.

Here, in the assembled battery according to this invention, the insulating isolation member 12 is made of a flexible insulating sheet piece 24 that is water-impermeable and has self-restoring elasticity in the direction of deployment.
It is composed of. The insulating sheet piece 24 having such self-restoring elasticity is made of polyethylene 2
It is made of so-called laminate paper, which is made by laminating 6 sheets. When such a flexible sheet piece 24 is inserted into the exterior body 12 in a rolled state, it tends to expand outward within the exterior body 12 due to its self-restoring elasticity. Due to this property, the sheet piece 24 inserted into the exterior body 12 becomes cylindrical, following the inner surface of the exterior body 12. By forming the sheet piece 24 into a cylinder in this way, the state of contact between the sheet piece 24 and the inner surface of the exterior body 12 becomes very tight, and therefore the third
As shown in the figure, the unit cells 10 can be smoothly inserted inside the sheet pieces 24 and stacked in series. In this case, since a polyethylene laminate paper piece is used as the sheet piece 24, it is desirable that the polyethylene 26 side thereof faces the unit cell 10 side. Thereby, the operation of inserting the unit cell 10 can be performed more smoothly since the unit cell 10 is guided by the smooth polyethylene surface of the laminated paper piece.

Here, the width of the insulating sheet piece 24 is 3 mm above and below the stack of unit cells 10, respectively.
If you set it in advance so that it protrudes extra, you can cut the length as necessary. Therefore, if the sheet piece 24 has a predetermined width and is rolled into a roll shape in advance, the outer diameter of the unit cell 10 can be changed by simply changing the length to be cut according to the outer diameter of the unit cell 10. It can be adapted very easily. In addition, its length may be just enough to go around the side of the stack of the unit cell 10 and leave a little extra, and there is no big restriction on the extra length, so its dimensional flexibility is high. It's getting very big. In addition, in the manufacturing and assembly process, even if the sheet piece 24 cut to a predetermined length is appropriately rolled up and inserted into the exterior body 12, it will expand naturally due to the self-restoring elasticity of the sheet piece 24. Eventually, it can take on a predetermined cylindrical shape that follows the inner surface of the exterior body 12. Furthermore, it follows the inner surface of the exterior body 12 and, due to its self-restoring elasticity, is constantly pressed against the inner surface of the exterior body 12 to stably maintain its predetermined cylindrical shape. Therefore, in the manufacturing and assembly process, it becomes very easy to insert the cell 10 inside the sheet piece 24, and the sheet piece 24
Handling is also very simple, as all you have to do is roll it up appropriately and insert it into the exterior body 12. moreover,
Since such an insulating sheet piece 24 can be made thinner by using a polyethylene laminate paper piece, it is also possible to improve the volumetric efficiency of the assembled battery.

In addition, in the assembled battery of the example shown in FIG.
An anode terminal plate 16 and a cathode terminal plate 18 are disposed at the upper and lower ends of the stacked body of the unit cell 10, respectively, and each terminal plate 16, 18 is connected to the cylindrical metal exterior body 12 via an insulating ring 22. is held down by the inwardly bent ends of both open ends. Further, in order to maintain good and stable contact between the terminal plates 16 and 18 and the unit cell 10 and between the unit cells, a leaf spring 20 is inserted in an elastically bent state.

As described above, the assembled battery according to this invention can be constructed at a lower cost than before by using relatively inexpensive insulating sheet pieces called polyethylene laminate paper pieces, and has greater dimensional flexibility. Since the operations in the manufacturing and assembly processes can be simplified, the suitability for production can be greatly improved compared to the conventional method, and since the insulating isolation member can be made thinner, the volumetric efficiency can also be increased.

[Claims for Utility Model Registration] Flat unit battery 10 consisting of a plurality of alkaline batteries
, a cylindrical metal exterior body 12 with both ends open, and a cylindrical insulating and isolating member 14, the insulating and isolating member 14 being impermeable to water, and
The insulating isolation member 14 has a polyethylene sheet piece 26 and a paper 28 laminated thereon, and a plurality of flat unit cells 10 are connected in series. The insulating isolation member 14 is loaded into the exterior body 12 with a
and the exterior body 12.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of an assembled battery according to this invention, Fig. 2 is a partial sectional view of an insulating isolation member used in a battery according to an embodiment of this invention, and Fig. 3 is a sectional view showing an example of an assembled battery according to this invention. FIG. 3 is a perspective view showing one state during assembly. 10... Unit cell, 12... Cylindrical metal exterior body, 1
4...Insulating isolation member, 16...Anode terminal plate, 18
... Cathode terminal plate, 20 ... Leaf spring, 22 ... Insulation ring, 24 ... Insulation sheet piece, 26 ... Polyethylene, 28 ... Paper.