JPH01232657A - laminated battery - Google Patents

Abstract

PURPOSE:To stabilize contacting of terminal surfaces of element cells with each other by placing the element cells one over another with a two-side adhesive conductive tape interposed. CONSTITUTION:A plurality of element cells 1 are put one over another with a two-side adhesive conductive tape 3 interposed, which is provided on each terminal surface of these cells, This conductive tape 3 consists of a base of 0.1mum thick formed by coating a conductive substance such as Cu and Ni in a thickness of 1-10mum on the surfaces of synthetic fibers of polyester etc., and the surfaces of this base are coated with an admixture of approx. 30mum thick consisting of sticky substance of acryl etc., and conductive particles such as Cu, Ni, and carbon.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a stacked battery in which a plurality of unit cells are stacked to obtain a high voltage.

<Prior art> This type of laminated battery includes one in which adjacent terminal surfaces of multiple stacked unit cells are sequentially bonded with a conductive adhesive,
Alternatively, it is known that a unit cell group in which a plurality of unit cells are stacked is pressurized from above and below using spring terminals or the like, so that adjacent terminal surfaces between the unit cells are brought into pressure contact with each other.

<Problems to be Solved by the Invention> However, in the conventional laminated batteries mentioned above, those of the type that are pressurized with spring terminals, etc., make electrical connection between unit cells only by contact by pressurization. When the force of this spring is weakened or external vibrations are applied, the contact properties of the unit cells tend to deteriorate easily, resulting in problems such as unstable battery performance and poor reliability.

In addition, in the case of a type that uses conductive adhesive, the electrical connectivity between the terminal surfaces between the unit cells deteriorates in areas where the conductive adhesive is once peeled off due to external force after manufacture, which also impairs battery performance. The problem is that it is unstable and unreliable.

The object of the present invention is to provide a stacked battery that does not have these problems.

<Means for Solving the Problems> The laminated battery of the present invention has a structure in which a plurality of unit cells are sequentially stacked via a double-sided adhesive conductive adhesive tape provided on the terminal surfaces of the unit cells. The gist is that they are configured by connecting them in series.

Such conductive adhesive tapes are made by coating a conductive material such as copper or nickel on the surface of synthetic fibers such as polyester.
~10 μm thick coating made with a thickness of 0.1
Apply 30 μm of a mixture of adhesive such as acrylic and conductive particles such as copper, nickel, or carbon to both sides of the μm base material.
A material composed of a coating with a thickness of about 1.5 m is used.

Further, as the unit cell described above, a flat battery such as a coin-shaped lithium battery, or a cylindrical battery such as a cylindrical lithium battery can be used.

Furthermore, heat-shrinkable insulating resin tubes are shrunk and tied on the outer surface or peripheral surface of the power generating element, which is constructed by stacking these unit cells, except for the positive and negative terminal surfaces, or synthetic resin or metal A case (exterior can) may be combined.

<Function> By adopting the method described above in which adjacent terminals are fixed to each other using conductive adhesive tape, it is possible to create a laminated battery that is easy to manufacture and requires no man-hours, and in which the contact between the terminal surfaces of the unit cells is stable. Obtainable.

<Example> The present invention will be described in detail below with reference to the accompanying drawings.

First, as shown in the figure, an insulating film 2 made of polyvinyl chloride or the like is placed on the outer peripheral surface of the unit cell 1, which is an RC2032 type flat lithium battery, except for the positive terminal surface and the negative terminal surface. It is wrapped.

On the other hand, on the negative electrode terminal surface 1a of this unit cell 1, copper is coated with a thickness of 3 μm as a conductive material on the surface of a synthetic fiber made of polyester.
A 0.1 μm thick substrate is coated with a mixture of acrylic adhesive and conductive particles (copper powder) on both sides to a thickness of 30 ALrn.
One side of a double-sided adhesive conductive adhesive tape 3 having a width of 12 mm and a width of 12 mm was attached.

Then, as shown in FIG. 2, the unit cells 1 with the conductive adhesive tape 3 adhered to the negative electrode terminal surface 1a are sequentially laminated in the thickness direction of the unit cell, and the conductive tape is also attached. Finally, unit cells 1 which were similar except that they were not adhered were stacked from above, and a case 4 made of a tin plate with a thickness of 0.2 mm was attached to the outer periphery of the power generating element thus obtained, as shown in Fig. 3. Thus, a laminated battery according to the present invention (product of the present invention) was produced.

/ On the other hand, a laminated battery for comparison (comparative product) was produced in the same manner except that the terminal surfaces of the unit cells were connected using a conductive adhesive made of acrylic adhesive and copper powder.

Then, the inventive product and the conventional product obtained above were each given 10
The short circuit current (m^) of each piece was examined immediately after it was dropped from a height of 0.75 m and after it was stored for 20 days at a temperature of 60° C. and a relative humidity of 90%. Regarding these results, the following table shows the average of 10 samples each for the inventive product and the conventional product.

<Effects of the Invention> As described above, according to the present invention, it is possible to obtain a laminated battery that is easy to manufacture, requires no man-hours, and has stable contact between the terminal surfaces of the unit cells.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a unit cell used in an example of the present invention, FIG. 2 is an explanatory diagram of the manufacturing process of the laminated battery of the present invention, and FIG. 3 is a sectional view of this laminated battery. DESCRIPTION OF SYMBOLS 1... Unit cell, 2... Insulating film, 3... Conductive adhesive tape. District 1, Figure 3, Figure 2

Claims (1)

[Claims] (1) A stacked battery characterized in that a plurality of unit cells are connected in series by stacking them one after another via double-sided adhesive conductive adhesive tape provided on the terminal surfaces of these units. .