JPS636983B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention incorporates a power generation element such as a silver oxide battery, nickel zinc battery, mercury battery, lithium battery, nickel cadmium battery, alkaline manganese battery, etc., and insulates the opening of the metal case to which the anode metal ring is pressed. Regarding the improvement of a sealed battery that is liquid-tightly sealed with a sealing plate through sealing packing, excluding the inner surface of the upper part of the opening of the metal case into which the anode mixture pellet and the anode metal ring are inserted, and the inner periphery of the upper surface of the anode metal ring. Then, on the periphery of the corner with the anode metal ring, an adhesive film made of synthetic resin or synthetic rubber, or a bituminous material such as asphalt or pitch, which is resistant to electrolyte, has excellent adhesion to metal, and is sticky in the film state, is applied to the cross section. Form into an L shape,
When inserting and installing the disc-shaped separator and impregnating material, the periphery of the separator is fixed to the anode metal ring, which stabilizes the battery structure and improves the liquid-tightness of the battery. It is something. Hereinafter, a button-type silver oxide battery will be described as an example of the present invention with reference to the drawings. In the figure, reference numeral 1 indicates a cylindrical metal case with a bottom, and reference numeral 2 indicates an anode mixture pellet placed at the inner bottom of the case 1, which is formed by pressure molding a mixed powder of silver oxide, graphite, etc. Therefore, case 1 also serves as an anode terminal. 3 is a disc-shaped separator placed on the anode mixture pellet 2, and 4 is a disc-shaped electrolyte-impregnated material placed on the separator and impregnated with an alkaline electrolyte. Reference numeral 5 denotes a gel cathode disposed on the impregnated material, which is mainly composed of zinc chloride powder. 6 is a single metal sealing plate that closes the opening of the case 1, and 7 is a ring-shaped insulating sealing packing attached to the outer periphery of the sealing plate 6. It is made of synthetic resin with excellent elasticity and flexibility, and the cross-sectional shape is approximately It is L-shaped. Reference numeral 8 denotes an anode metal ring having an inverted L-shaped cross section that contacts the inner circumferential surface of the case 1, the outer circumferential surface of the anode mixture pellet 2, and the upper outer circumference of the anode mixture pellet 2; When pressing and re-molding, they are pressed and fixed at the same time. 9 is an electrolyte-resistant coating applied to the corner edges of the case 1 and the anode ring 8, except for the inner surface 1a of the upper opening of the mixture-containing case 1 and the inner periphery 8a of the upper surface of the anode ring 8 brim. It is an adhesive made of synthetic resin, synthetic rubber, asphalt, or pitch that has excellent adhesion, maintains a film state, and has tack. The main purpose of this adhesive is to adhere the separator 3 and the impregnating material 4 to the mixture-containing case 1 and to stably fix them inside the case 1 when they are installed on the anode ring. Conventionally, there was no adhesive 9, so the inner diameter of the case 1, the separator 3, and the impregnating material 4 were
It is difficult to balance the outer diameter of the separator 3 and the impregnating material 4 with the outer diameter of the case 1. If the outer diameter of the separator 3 and the impregnating material 4 are small, they are likely to come off during the work process, and conversely, if the diameter is large, the periphery may be formed between the case 1 and the sealing packing 7. There was a phenomenon in which liquid got into the tank and leaked easily. In the present invention, by forming a coating of adhesive 9 on the corner edges of the case 1 and the anode ring 8, the gap between the inner diameter of the case 1 and the outer diameters of the separator 3 and the impregnating material 4 is reduced to approximately 1 mm in diameter. Both can be adhesively fixed in a stable state, and there is no need to change the product type or adjust the punched outer diameter dimensions of the separator 3 and the impregnated material 4 depending on the processing set of the case 1 as in the past. In addition, by applying an alkali-resistant and highly adhesive synthetic resin such as chlorosulfonated polyethylene or polyamide, or a synthetic rubber such as isoprene rubber or chlorinated butyl rubber to the adhesive 9, the upper part of the case 1 can be attached to the inside. When sealing the battery by curling it,
Since the adhesive 9 is interposed between the inside of the case 1 and the outside of the sealing packing 7, the liquid-tight effect can also be enhanced. The reason why the adhesive 9 is not applied to the inner peripheral edge 1a of the upper opening of the case 1 is to prevent the adhesive 9 from oozing out when the case 1 is curled inward and sealed. Also, the reason why the adhesive 9 is not applied to the inner peripheral edge 8a of the upper surface of the brim of the anode ring 8 is that the adhesive 9 is not applied when the separator 3 and the impregnating material 4 are inserted and installed, or when the case 1 is curled inward and sealed. This is to prevent the agent 9 from spreading inward and reaching the upper surface of the anode mixture 2. Next, the workability during assembly and leakage resistance of the silver oxide battery according to the present invention were compared with conventional products. 1 Workability (indicated by defective rate)

[Table] 2 Leakage resistance (Stored in an atmosphere with a temperature of 45℃ and relative humidity of 80-90%)

[Table] The above values indicate the number of defective batteries out of 100 batteries. As described above, according to the present invention, the workability is high,
Furthermore, a sealed battery with excellent leakage resistance can be provided. In addition, in FIG. 3, when applying the adhesive 9 to the upper surface of the collar of the anode ring 8, a shallow ring shape is applied to the upper surface of the collar of the anode ring 8 except for the inner peripheral edge so that it does not spread to the anode mixture pellet 2. Recessed step 8'
This is the one that was used.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a button-type silver oxide battery according to an embodiment of the present invention, and FIG. 2 shows adhesive applied to the inner surface of the case and the corner of the anode metal ring.
FIG. 3 is a cross-sectional view showing a state in which the separator and impregnating material are inserted and installed, and FIG. 3 is a cross-sectional view when the flange of the anode ring is stepped to make it easier to apply the adhesive. 1...Battery case, 1a...Inner surface of the upper part of the opening,
2, 3, 4, 5... Power generation element, 6... Sealing plate, 7
... Sealing packing, 8 ... Anode metal ring, 8
a... Inner peripheral edge of the upper surface of the collar of the anode metal ring, 9
...adhesive film.

Claims (1)

[Scope of Claims] 1. An anode mixture pellet and an anode metal ring having an inverted L-shaped cross section are inserted and pressed into a metal case, excluding the inner surface of the opening upper part of the metal case and the inner peripheral edge of the anode metal ring, An adhesive film with an L-shaped cross section is provided around the corner edges of both the case and the metal ring, and is resistant to electrolyte, has excellent adhesion to metal, and is adhesive in the film state.This film is used to punch out discs. A sealed battery characterized in that the periphery of a separator and an electrolyte-impregnated material are fixed to an anode metal ring. 2. The sealed battery according to claim 1, wherein the anode metal ring has a shallow ring-shaped depression on the upper surface of the flange except for the inner edge thereof to hold an adhesive. 3. The adhesive forming the film is at least one selected from the group consisting of chlorosulfonated polyethylene, polyamide, isoprene rubber, chlorinated butyl rubber, asphalt, and pitch. The sealed battery described in item 2.