JPS6344947Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a flat battery assembly in which a plurality of button-shaped batteries are arranged on a plane and electrically connected to each other to be used as one unit battery.

Button batteries include nickel-cadmium batteries and silver-zinc oxide batteries that use an alkaline aqueous solution as an electrolyte.In recent years, these batteries have been electrically connected in series or parallel to form a collective battery, which is used for printed circuit boards of various electronic devices. It is attached to the circuit by directly soldering the positive and negative leads like other electronic components, and is
-It is often used for the purpose of backing up memory such as RAM. These button batteries have been improved to have significantly better leakage resistance than conventional cylindrical nickel cadmium batteries, but depending on the conditions of use, they may not be completely free of alkaline electrolyte leakage. I can't say it enough. For example, under hot, humid conditions or conditions with large temperature changes, electrolyte leaks and alkaline aqueous solutions are highly prone to creep, so leaked electrolyte can reach printed circuit boards and damage printed copper electronics. In some cases, the circuits were damaged. The present invention is used under such conditions, and even if leakage occurs,
This prevents it from damaging the printed circuit board.
In other words, this invention relates to an improvement for preventing alkaline electrolyte from leaking out of an assembled battery even if a single cell leaks, and will be described in detail below with reference to the drawings.

FIG. 1 is a diagram for explaining the structure of a flat type battery assembly according to the present invention. In Figure 1, 1,
1' and 1'' are, for example, button-shaped nickel-cadmium cells, in which the positive electrode plate, separator, and electrolyte consisting of an alkaline aqueous solution such as caustic potash in the positive electrode case 2 and negative electrode case 3 are connected to the positive electrode through packing. - Generally, the negative electrode cases 2 and 3 are sealed together by caulking.These cells are electrically connected in series by connecting pieces 4 and 4' to form one unit. It becomes a battery, with 3 being the negative terminal and 2'' being the positive terminal. Reference numeral 5 denotes liquid-absorbing paper or cloth that wraps the unit battery with holes or cuts 6, 6' formed at the positions where the positive and negative electrodes are located. The wrapping method in step 5 will be described later, but the thickness may be about 0.1 to 1.0 mm, and the material may be any material that can absorb and retain an alkaline aqueous solution, for example, it may be made of filter paper or the like. 7, 7' is a metal cap made of nickel, stainless steel mesh, or nickel-plated iron plate with a thickness of about 0.1 to 0.5 mm, and has a shape that just fits over the opening of the paper 5, etc. that wraps the unit battery. have. Then, using the notches or holes 6, 6' made in the cylindrical paper 5, spots are placed on the case 3, which will become the negative terminal of the unit battery, and the positive electrode case 2'', which will become the positive terminal, as shown at 8, 8'. Electrically connected by welding etc.

Thereafter, a heat-shrinkable tube 9 serving as a label, for example, is covered, and the negative electrode lead 10 and the positive electrode lead 11 are connected by spot welding, thereby completing the flat battery assembly according to the present invention. In addition, Figure 2 A, B, and C show examples of the shape of 5 such as liquid-absorbing paper that wraps the unit battery. It has multiple holes 6 and 6'. B is wrapped in paper with a thickness of about 0.5 to 1.0 mm and has cut parts 6 and 6'.
In this case, the paper 5 has a shape in which it is joined at 12 portions, and this portion may be fixed by using an adhesive or by pasting cellophane tape from the top surface. Ha is thickness
For example, wrap relatively thick paper of about 1.0 mm so that the cross section is U-shaped and wrap it around 5' and 5'' to hold the unit battery between them. As in the case of (b), fix with adhesive or sellotape.

With this kind of structure, even if the alkaline electrolyte leaks out of the cell as mentioned above, it will be absorbed by the paper or cloth wrapped around it and will change into carbonate over time, preventing electrolysis. The problem of liquid passing through the positive and negative leads to the board and damaging printed circuits is eliminated.

As described above, the present invention is a flat type battery that is mounted on a printed circuit board for electronic circuits for CMOS-RAM backup and does not damage the electronic circuits on the printed circuit board even when used under severe conditions. It is of extremely high practical value.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the structure of a flat battery assembly according to the present invention, in which a plurality of button batteries are electrically connected in series, and Figure 2 A, B, and C are unit batteries used in the present invention. It is a figure which shows the example of the shape of wrapped absorbent paper etc. 1, 1', 1''...Button cell, 5,
5', 5''...Liquid-absorbing paper or cloth to wrap the unit battery, 6,6'...Hole or cut in 5, 7,7'...Metallic cap, 9...Heat shrinkage sex tube, 10... negative electrode lead, 11... positive electrode lead.

Claims (1)

[Scope of utility model registration request] In a flat battery assembly in which a plurality of button batteries are arranged on a flat surface and electrically connected to form a single unit battery, the unit batteries are covered with liquid-absorbing paper, cloth, etc. Cover the openings at both ends of the unit battery with metal caps, and electrically connect the caps to the positive and negative electrodes of the unit battery by wrapping the unit cell except for the positions where the positive and negative electrodes are located, and using paper or cloth. A flat battery assembly characterized by having a heat-shrinkable tube that also serves as a label covered over a part of the battery and a part of the cap.