JPS6255871A - Nonaqueous electrolyte cell - Google Patents

Abstract

PURPOSE:To simplify the cell assembling process by arranging an annular member on the upper or lower face of a separator while forming an electrolyte layer with the inner space of an annular member thereby making the electrolyte impregnatable under normal pressure thus eliminating the vacuum impregnation process. CONSTITUTION:A positive electrode 1 is pressure contacted against a positive electrode current collector 10 secured to the inner bottom face of an outer can 9 also serves as positive electrode terminal then a separator 3 is mounted and an annular member 4 is arranged to inject the electrolyte into the inner space of the annular member 4 thus to form an electrolyte layer 5. Then a negative electrode 2 is pressed against the negative electrode current collector 8 secured to the inner bottom face of a sealing cover 7 also serves as the negative electrode thereafter said cover 7 is mounted into the opening of an outer can 9 and to tighten the open edge against an insulation packing 6. The positive electrode 1 is made by sintering the compound of copper oxide, graphite and fluorine resin while the negative electrode 2 is made of rolled lithium board, the separator 3 is made of fine porous polypropylene film, the annular member 4 is made of polypropylene and the electrolyte is made by dissolving lithium perchloric acid into mixed solvent of propylene carbonate and 1.2 dimethoxy ethane.

Description

Detailed Description of the Invention B) Field of Industrial Application The invention is related to a non-aqueous electrolyte battery equipped with a positive electrode whose volume apparently increases due to a discharge reaction.B) Conventional technology, for example: Carbon heptatide, silver chromate, manganese dioxide, etc. disclosed in Japanese Patent Publication No. 54-35653, metal sulfides, silver oxide, bismuth oxide, etc. disclosed in Japanese Patent Application Publication No. 57-174871 etc. have the property of increasing their apparent volume due to discharge reaction, so when a non-aqueous electrolyte battery is incorporated as an active material to correct such a material,
There are problems as described below.

That is, as described in the above-mentioned prior art document,
Polypropylene nonwoven fabric is generally used as a separator member for this type of battery.

The volume of the positive electrode increases due to N5 discharge.The separator made of polypropylene non-woven fabric interposed between the positive and negative parts is compressed and the electrolyte to be impregnated and retained is squeezed out.1 The polypropylene non-woven fabric is partially free of electrolyte. is interposed between the positive and negative electrodes, and this thick polypropylene nonwoven fabric becomes a kind of insulating material, causing a rapid increase in internal resistance. As a result, there is a problem that battery characteristics deteriorate.

In order to solve the above-mentioned problems, the applicant Mizu has proposed a battery that uses a microporous resin film as a separator and has a structure in which the electrolyte layer can be cast (Japanese Patent Application No. 59-12965).
(See No. 9).

By the way, in the case of such a structure, when forming the electrolyte layer, there is no gas trapping phenomenon and the K is properly formed.

It is necessary to impregnate the electrolyte in a vacuum, which complicates the battery assembly process.

(c) Problems to be solved by the invention The major invention is a battery having a structure in which microporous resin Twill is used as a separator and an electrolyte layer is formed. The purpose is to take advantage of the advantage of not increasing rapidly and to simplify the formation of an electrolyte layer.

B) Means for solving the problems The present invention uses a microporous resin film as a separator and arranges an annular body on the upper or lower surface of the separator,
It is characterized in that an electrolyte layer is formed between the interiors 22 of the annular body.

According to the present invention, since the electrolytic solution layer is formed in the internal space of the annular body, the electrolytic solution can be impregnated at normal pressure, so a vacuum impregnation process is not necessary and the battery assembly is easy. The process is simplified.

(G) Embodiment FIG. 1 shows a vertical cross-sectional view of a battery according to an embodiment of the present invention, in which 11 is a straight line, copper oxide 851 is weighed, graphite is 10% by weight as a conductive agent, and a binder is Fluororesin 5
A mixture of 200 g and 200 g of 2000 g was press-molded at a pressure of 2) m/-, and pellets with a diameter of about 11.0 g and a thickness of 1.8 g were calcined at a temperature of 200 to 300 g. . (2)
is a negative fence with a lithium rolled plate with a thickness of about 22 mm and a diameter of about 7
．． 5 fi punched I/-1t. (3I is a separator made by punching out a microporous polypropylene film with a thickness of about 0.025 mm to a diameter of about 11 degrees. (4) is an annular body that is the gist of the present invention. The annular body (4) has an outer diameter of approximately 11.0 Jall and an inner diameter of 8.0 Jall, is made of polypropylene, and is placed on the upper surface of the separator (31).The space of this annular body (4) is filled with an electrolytic solution. A layer (61) is formed. Note that the annular body may be formed of a conductive material.

This battery is assembled as follows. That is, first, an insulating backing (sr@
Negative 1g1f!l is fixed to the inner bottom surface of the NRT negative electrode current collector (8) to prevent negative@+2+ from falling even if 1 is reversed. The lower surface of the negative electrode 121 is arranged so that the lower surface of the insulating backing (6) or the negative electrode (2) protrudes downward.

On the other hand, the positive electrode +11 is pressure-welded to the positive current collector l11m which is attached face-to-face to the inner bottom surface of the outer can 191 which also serves as a pant.
A separator [$1 is placed on the separator [$1], and an annular body (4) is placed on top of it. In this state, an electrolytic solution is injected into the internal space of the annular body (4) to form an electrolytic solution layer 1ift. Set up

The electrolyte used here was propylene carbonate and 1.2
1 liter of lithium perchlorate in a mixed solvent with dimethoxyethane
mol/ is dissolved.

Then, attach the sealing lid [7] fixed to the negative electrode 1211 to the opening of the outer can (outer case), and tighten the opening edge of the outer can (outer!i+s+) to the insulating backing (6) to complete the battery.1 The second reason is the main This is a vertical cross-sectional view of a battery according to another embodiment of the invention, and the difference from the battery structure in the first example is that the annular body (4) has a separator (31
It is located on the bottom surface of the .

(g) Effects of the Invention If the battery of the present invention is constructed, even if the volume of the positive electrode increases with discharge and the positive and negative electrodes approach each other, and the electrolyte in the separator interposed between the positive and negative electrodes is squeezed out, the separator remains in a thin layer. Since the battery is made of a microporous resin film, the distance between the positive and negative terminals is short, and as a result, a rapid increase in internal resistance is suppressed and battery characteristics can be improved.

Further, since the electrolytic solution layer can absorb the volume increase of the positive electrode, it is possible to prevent the battery from expanding.

Furthermore, when forming an electrolyte layer, an annular body is placed on the upper or lower surface of the separator, and the electrolyte is completely filled in the internal space of this annular body to form an electrolyte layer, and the electrolyte is kept under normal pressure. This simplifies the battery assembly process.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a battery according to an embodiment of the present invention, and FIG.
The figures each show a longitudinal sectional view of a battery according to another embodiment of the invention. [11-Positive electrode, +21-・Negative electrode, +31-・Separator 5 (41”・Annular body, +51-・Electrolyte layer, (6)-Insulating backing i71-Sealing lid, tsn-Exterior can.

Claims (1)

[Claims] (1) A negative electrode whose active material is a light metal such as lithium or sodium or an alloy thereof, a positive electrode whose apparent volume increases due to a discharge reaction, and a separator made of a microporous resin film interposed between the positive and negative electrodes; A non-aqueous electrolyte battery comprising an annular body disposed on the upper or lower surface of a separator and an electrolyte layer formed by the annular body.