JPS58176862A - Process for producing miniature, thin battery - Google Patents

Abstract

PURPOSE:To prevent the liquid leakage and swelling of the captioned battery, by bringing a positive electrode can face to face with a negative electrode can after forming each of them to possess a collar part of the same diameter, holding those collar parts with the holding member having a U-shaped section coated with adhesive, and sealing said collar parts. CONSTITUTION:A positive electrode can 1 and a negative electrode can 2 which contain the battery content of a lithium battery or the like are formed so as to possess collar parts with the same diameter, and those collar parts are brought face to face each other, while maintaining them intact by using 2 semicircular U-shaped ring caps 3 previously coated with semi-solidified adhesive 8 which is made by kneading epoxyresin-epicoat 868, curing agent-epocurezet and glass fiber; after that, said adhesive is solidified to seal them. Consequently, the liquid leakage-proof property can be made satisfactory by the electrolytic solution- proof property of epicoat 868, and a miniature, thin battery having a good characteristic and entire height less than 1mm. can be easily formed.

Description

[Detailed description of the invention] Ru.

The miniaturization of some electronic devices has created a lot of demand, which in turn has encouraged the miniaturization of electronic devices, which is now accelerating to the point where it can be said that the exact size is unknown. Of course, this depends on semiconductor technology and integrated circuit technology, but another pillar must be the development of excellent small batteries. In particular, small electronic devices are expected to further develop with advances in lower power consumption, but I have a feeling that the development of batteries is lagging behind, and it is still believed that small batteries with a total length of less than 1 inch are difficult to manufacture. . The present invention is an attempt to overcome this problem, and since there is currently little prospect of developing solid-state batteries, the present invention aims to solve this problem with a lithium battery using an organic solvent.

For this reason, the present invention provides a method of insulating the mating portions of the anode and cathode cans and then sealing them with an adhesive to accommodate the battery contents. As an adhesive, various synthetic resins can be dissolved by immersing them in an electrolytic solution in which 1 mole of perchlorine + 1 t IJ tium is added to the electrolytic agent Blobile/Carphonate or Diphthoki/Ethane.
As a result of observing the swelling with the naked eye, measuring its weight, and observing changes in color, it was found that the epoxy resin has sufficient electrolyte resistance depending on the usage.

Among them, it has been found that Epicote 868 and a product in which the curing agent Ebicure Z is used for a period of time are relatively easy to use and are extremely suitable for the present purpose. The present invention uses this to provide a shape and manufacturing method particularly suitable for small, thin batteries. Embodiments of the present invention will be described using the drawings.

The cathode can and anode can 1゜2 (only the flange is insulated) as shown in Fig. 1A and B have a relatively large internal volume compared to the dog-shaped outside, and the case I chose this method because it is easy to make and the dimensional accuracy can be maintained to a certain level. The sealing is performed by using two semicircular U-shaped ring camps, which are adhesive holding members, as shown in FIGS. 2 and 3. To this, the above-mentioned epochino resin Epicor 86, which is resistant to electrolyte, is used.
Adhesive 8 (Fig. 3), which is made by kneading 8, its hardening agent Ebicurez, and glass fiber or glass powder and semi-solidifying it.
The cathode can 1 and the anode can 2 are coated in advance with the above-mentioned cathode can 1 and anode can 2. As shown in FIG. The outer part of the collar is placed over the assembled garment, and then the adhesive is solidified and sealed.

It is even better if the cases shown in FIGS. 1A and 1B have a curved flange as shown in the figures.

Actually, lithium was used as the cathode material to a thickness of 250 μm so that the outermost diameter was 95 mm and the total length was 1 mm. %, with 4% binder added separately to 400μ
m thickness and charged with a U-shaped ring. Inside the cap, we added 20% by volume of Ebicure Z as a hardening agent to Epicor 868 as mentioned above, and pressed it with a glass fiber bed.We made a battery and measured its performance.The results are as follows. As shown in Figure 4, this is fully satisfactory.

Figure 4 shows the discharge characteristics of a battery according to the present invention in which a 30Ω resistor is connected, and the horizontal axis represents the discharge energy;
The vertical axis shows battery voltage.

As for leakage resistance, in addition to being left at room temperature, we conducted a storage test at 60°C, 90% R8, for 40 days, and it was determined that there was no leakage.

Pl swelling and other conditions were within a satisfactory range.

[Brief explanation of drawings]

FIGS. 1A and 1B are cross-sectional views showing a cathode can and an anode can, respectively, used in the present invention. FIG. 2 is a sectional view of an adhesive holding member used in the present invention. FIG. 3 is a sectional view showing the structure of a thin type battery sealed by the method of the present invention. FIG. 4 is a diagram showing the discharge characteristics of the battery according to the present invention. 1 cathode can, 2 anode can, 3 adhesive holding member, 4: lithium metal, 5: electrolyte and holding agent, 6: separator, γ anode tablet, 8 adhesive.

Claims (1)

[Claims] An anode can and a cathode can were each formed to have flanges of the same diameter, and the flanges of the anode can and cathode can were brought together to accommodate the contents of the battery, and an adhesive was applied in advance. ,
Production of a small thin battery characterized by assembling an adhesive holding member having a U-shaped cross section so that the abutted collar portions are inserted into the cross-sectional opening, and then solidifying the adhesive and sealing the battery. Method.