JPH0311811Y2 - - 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.

Button batteries include nickel-cadmium batteries, silver-zinc oxide batteries, etc. that use an alkaline aqueous solution as an electrolyte. In recent years, several of these batteries have been electrically connected in series or parallel to form a collective battery, and these batteries have been soldered directly to the circuits of printed circuit boards of various electronic devices like other electronic components, and CMOS-
It is often used for backing up memory such as RAM. These button-shaped 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 leak alkaline electrolyte at all. I can't say it enough. For example, under hot and humid conditions or conditions with severe temperature changes, alkaline aqueous solutions tend to creep easily, causing electrolyte to leak and reach printed circuit boards, causing damage to printed electronic circuits. In some cases, damage was caused. The present invention is used under such conditions, and even if leakage occurs, it will not damage the printed circuit board.In other words, even if a single battery leaks, the alkaline electrolyte can be transferred to the assembled battery. This invention relates to an improved battery assembly that does not leak outside, and will be described in detail below with reference to the drawings.

FIG. 1 is a diagram for explaining the structure of a flat battery assembly according to the present invention. In Figure 1, 1,
1' and 1'' are, for example, button-type nickel-cadmium batteries.Button-type nickel-cadmium batteries are
Inside, positive and negative electrode plates, a separator, and an electrolyte consisting of an alkaline aqueous solution such as caustic potash are sealed by caulking the ends of the positive electrode case 2 and negative electrode case 3 through packing. It is a common shape. These batteries 1, 1', 1'' are arranged on a plane and electrically connected in series by connection pieces 4, 4'. 5 is a negative terminal and 6 is a positive terminal. 7, 7 ' is a paper with a thickness of about 0.1 to 1.0 mm that has liquid absorbing properties and has incisions or holes at the positions where the positive terminal 6 and negative terminal 5 of the battery are located.
For example, as shown in FIG. 2, the unit battery is almost completely hidden. The paper may be made of any material as long as it can absorb and retain an alkaline aqueous solution, such as filter paper or pressboard. Furthermore, the way the battery is wrapped with paper 7, 7' is not limited to the shape shown in Figure 2; any shape that allows the paper to absorb liquid leakage from the button-type battery may be used. Therefore, in addition to dividing the battery into two parts such as 7 and 7', the battery may be wrapped in one or more pieces of paper depending on the size of the battery.

Next, this unit battery is inserted into the pipe 8 made of synthetic resin, and the pipe 8 is further inserted with a heat shrink tube 9.
The entire cell and a portion of the paper 7, 7' are covered to complete the battery according to the present invention. The material of the synthetic resin pipe 8 is suitably an extrusion molded product such as PVC or ABS, and the wall thickness only needs to have the necessary mechanical strength, so it is generally about 0.3 to 1.5 mm. good.

With this structure, even if the alkaline electrolyte leaks out of the button battery as described above, it will be absorbed by the paper surrounding the battery and change into carbonate over time, so that the electrolysis will not be possible. The problem of liquid traveling down the positive and negative leads to the substrate and damaging printed circuits is eliminated.

As described above, the present invention is a flat assembly that does not damage the electronic circuits on the printed circuit board even when it is mounted on a printed circuit board for electronic circuits for CMOS-RAM backup etc. and used under severe conditions. It provides batteries and has 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-shaped batteries are electrically connected in series, and Figure 2 is a diagram showing a structure in which a plurality of button-shaped batteries are electrically connected in series. FIG. 3 is a perspective view showing a state where the product is wrapped in paper. 1, 1', 1''...Button battery, 5...Negative terminal, 6...Positive terminal, 7,7'...Liquid absorbing paper, 8...
...Synthetic resin pipe, 9...Heat shrink tube.

Claims (1)

[Claims for Utility Model Registration] A plurality of button batteries 1, 1', 1'', connection pieces 4, 4', positive and negative terminals 5, 6, liquid absorbent paper 7,
7', a synthetic resin pipe 8, and a heat-shrinkable tube 9. A plurality of button-shaped batteries 1, 1', 1'' are arranged on a plane, and a connecting piece 4 , 4', the periphery is covered with liquid-absorbing paper 7, 7', one end of the positive and negative electrode terminals 5, 6 protrudes outside, and the whole is housed in a synthetic resin pipe 8. , a flat battery assembly characterized in that a heat-shrinkable tube 9 is wrapped around the outside thereof.