JPS6023967A - Plate battery - Google Patents

Abstract

PURPOSE:To obtain a thin flexible alkaline manganese Leclanche plate battery by using conductive plastic films as positive and negative terminals respectively working as a positive and negative current collector. CONSTITUTION:A conductive plastic is prepared by blending nitrobutadiene rubber used as a base with a copolymer consisting of vinyl acetate and vinyl chloride before the mixture is combined with 15% of carbon black in order to obtain conductivity. Positive active materials 2a and 2b are applied to conductive plastic sheets 1 and 4 by a general application method such as screen printing, gravure, squeezing or extrusion. Negative active materials 5a and 5b principally consist of zinc powder or amalgamated zinc. The negative active material 5b is applied to a negative current collector 6 in the same manner as the positive active materials 2a and 2b. The peripheral area of the battery is sealed by performing thermal fixation during the assembly after an emulsion of a copolymer consisting of vinyl acetate and vinyl chloride is applied to separators 3a and 3b. By the means mentioned above, a very thin flexible plate battery can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thin and flexible alkaline manganese and Lecrancier type flat plate battery.

Generally, the structure of a flat plate current battery is as shown in Figure 1. The positive and negative electrode current collectors 1 and 6 are a laminate in which aluminum foil (At foil) is placed on an S conductive plastic film (hereinafter abbreviated as conductor). Using a film, the positive electrode active material layer 2af mainly composed of manganese dioxide is coated on the positive electrode current collector l, a separator 3α is placed on top of the positive electrode active material layer 2af, and then a conductive layer 4
The duplex electrode coated with 5cL of zinc dust layer and 2bf of manganese dioxide layer is rearranged, and a separator 3b is placed on top of it.
Next, a dry batch on which the zinc dust layer 5b was applied in advance was placed on the negative electrode current collector 6. Since this battery is of a flat plate type, the electrode area is large and the distance between the electrodes can be made small, making it possible to draw a large current. Therefore, we decided to drive a small motor for advancing the camera's film.
strobe.

It was used as a power source for instant flash charging. This
These are all devices that require high-power grade batteries that consume large currents, as well as razors, small reinforced lights, and small radios.

In recent years, the trend in microelectronic devices with built-in batteries has been toward smaller, lighter, thinner, and smaller devices.This trend has led to improvements in integrated circuit technology and rapid reductions in power consumption. In particular, in small electronic devices such as electronic watches, electronic games, and peso modules, the extinction current has decreased to about 1 to 2 μ8. Against this background, there is a strong demand for batteries to be smaller and thinner, and button-type silver batteries have reached a thickness of 1 inch, which is equivalent to O68. Therefore, what will be required of batteries in the future is to reduce the thickness to the absolute minimum in order to make small electronic devices even smaller and thinner.
It has a flexible characteristic that allows it to be deformed and makes use of some dead space in small electronic devices.

Conventional flat plate batteries have five conductors as positive and negative current collectors.
Since the At foil is laminated with a thickness of approximately 0 μm, flexibility is low and it is difficult to provide large flexibility characteristics. In addition, the battery thickness must be increased to 1 to 2 laps.
It was also not as good as the button-type silver battery. In the case of button current batteries, a metal can is used as the outer case, so
There is a limit to its thinness, and it naturally does not have flexible properties.

The present invention eliminates the above-mentioned drawbacks and provides an extremely thin and flexible flat battery.Examples thereof will be described below with reference to FIG. 2.

The flat battery shown in Figure 2 has the same voltage as the flat battery shown in Figure 1! It has a V-type structure. 1 and 6 are conductive plastics with a thickness of 10μηL, and 7t are current collectors for positive and negative electrodes, respectively. 4 also uses the same conductor. This conductor is made by blending a copolymer of vinyl acetate and vinyl chloride with nitrile butadiene rubber as a base, and further adding 15% carbon plaque in total to obtain conductivity. Naturally, this conductor plastic should be conductive as a current collector and an electrode, and should be resistant to electrolyte, and only needs to be 62L. for example,
There are RV4 bras made by adding carbon black to polyethylene.

Are these conductors coated with carbon black to improve current collection? :As a result of adjustment, the body resistance is 5~8X1
A conductor with a surface resistivity of 3 to 5 x 10 Ω was obtained.

2α and 2b are positive electrode active materials mainly composed of manganese dioxide, and the thickness is regulated to f 20 p m. The positive electrode active materials 2a and 2b were applied to the special plastics 1 and 4 in advance using a general coating method such as screen printing, gravure printing, squeegeeing, and extrusion. For 3a and 3b, 10 μm thick cellophane cellophane used in silver oxide batteries, etc. was used. 5
α and 5b are negative electrode active materials mainly composed of zinc powder or zinc hydrate, and the coating thickness was always regulated to 5 μm using the above-mentioned general coating method, similarly to the positive electrode active materials 2α and 2b. The electrolyte is 9N potassium hydroxide solution, 35wt% zinc chloride, 3% ammonium chloride.
The experiment was carried out on ``rM'' of wt candy and vinegar solution of dissolved solution.First
The table below is a composition table that summarizes the ingredients. To seal the area around the battery, in order to strengthen the adhesion with the conductor, apply an emulsion of a copolymer of vinyl acetate and vinyl chloride, which is one of the components of the conductor, to the separator in advance. At that time, it was sealed by heat compression bonding.

Table 1 The NFC battery manufactured as shown above is extremely thin and flexible, with a thickness of O01, and even when bent at 90 degrees at the center of the battery, it has the same characteristics as a flat plate. did it.

FIG. 3 shows a current-voltage curve measured by connecting an external electrode having the same shape and size as the battery electrode surface.

In this way, an extremely thin and flexible battery that is not only able to draw enough current to meet the current consumption of small electronic devices will also make it possible to manufacture batteries of any shape, making it possible to produce small, thin, and small electronic devices. It is expected that this will make a significant contribution to the rounding process that will make it possible to achieve this goal. Further, in the example, a 3-inch type flat plate battery was shown, but it has been confirmed that the thickness can be reduced to 0.05 mm in the case of a 1° 5-inch type.

[Brief explanation of drawings]

Figure 1 shows a conventional flat plate battery. FIG. 2 shows a flat plate battery according to the present invention. 1°. Positive electrode current collector, 2°. Positive electrode active material, 3°,
Separate 1/-ta, 4°. Intermediate current collector, 5°. Kuchiku live animal observation,
6°. 9-pole current collector. FIG. 3 is a current-voltage curve obtained according to an embodiment of the present invention. I.A. Alkaline type, IB
,,Alkali type f: 90° bending, 2A,,Lecrancier type, 2B. . Le Clancier type 90
°When bent. that's all

Claims (1)

[Claims] Manganese dioxide for the positive electrode, zinc powder or frozen zinc for the negative electrode,
In primary batteries that use non-woven fabric, cellophane or (or kraft polyethylene) as the separator, and a potassium hydroxide solution or sodium hydroxide solution or a mixed solution of zinc chloride and ammonium chloride as the electrolyte, conductive plastic films are used as positive and negative electrode current collectors. ) positive and negative terminals and 1
A flat plate battery characterized by a.