JPS5812368Y2 - Sealed small battery manufacturing equipment - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a sealed small battery manufacturing apparatus.

In recent years, small portable electronic devices such as electronic watches, cameras, small calculators, lighters, and hearing aids that use batteries as a power source have become increasingly popular, and as a result, batteries are expected to become smaller, thinner, and have higher capacity. .

Batteries that meet these requirements include alkaline batteries with a large capacity per unit volume, in particular zinc, indium, and cadmium as negative electrode active materials, and silver oxide I, n, mercury oxide, manganese dioxide, and manganese oxide as positive electrode active materials. Those that used nickel are now widely used.

These alkaline batteries, especially silver oxide (1) and (2) batteries, use an alkaline electrolyte, so they are not perfect in terms of leakage resistance.

In particular, the tendency for batteries to become smaller due to the miniaturization of electronic devices used, and for longer lifespans of radio waves due to lower current consumption of these devices, will increasingly require improved leakage resistance of batteries.

However, in order to improve leakage resistance, this type of alkaline battery has conventionally had a general structure as shown in Figure 1, with the anode side consisting of a low cylindrical anode end 1 and an anode mixture 2, and a cathode. The side consists of a cathode end 3 and a cathode mixture 4, which are joined via a separator 5 and an electrolyte 6, and a gasket 7 for insulating the anode and cathode ends is inserted to close the upper end of the anode end. It was caulked inward to prevent leakage.

In order to make the caulking more complete, the caulking was performed in two stages: primary caulking using a press punch, shallow caulking at the upper end of the anode, and finishing with secondary caulking.

However - after the next crimping, the battery is moved to the secondary crimping machine,
Secondary caulking was performed by positioning the battery.

As a result, misalignment is likely to occur, and since the press punch is crimped from above the cathode of the battery, contact begins from the top of the anode of the battery and ends with the top of the cathode.

For this reason, the cathode end was easily distorted, the caulking from the side of the battery tended to be insufficient, and the caulking shape of the anode end was incomplete.

That is, as shown in Figure 2a, due to insufficient caulking pressure, the shoulder portion 1c of the anode end bulges, causing the gasket to bulge. The pressure required to prevent liquid leakage may not be applied to a, resulting in insufficient compressibility of the gasket, or, as shown in Figure 2, too much pressure may be applied only to the upper end of the anode, causing cracks to form in the part 7b of the gasket 7. As shown in Figure 2C, distortion occurred at the cathode end, causing leakage.

The present invention was made to eliminate the drawbacks of the conventional battery as described above, and aims to provide a manufacturing device for a sealed small battery that reduces process time and has excellent leakage resistance. .

The present invention will be explained in detail below with reference to embodiments shown in the drawings.

The structure of the press punch section of the battery crimping machine consists of three parts: a primary crimping press punch 9, a secondary crimping press punch 10, and a fixing base 8 for fixing the battery.

- The next crimping press punch 9 has a slit 9a and an end 9
b emphasizes lateral mobility.

The secondary press punch 10 has a curved shape 10a on the inside, and has a structure that matches the M portion 9c and the movable end portion 9b of the secondary press punch.

Next, the caulking operation of the device of the present invention will be specifically explained.

First, in FIG. 3a, all the parts necessary for the battery structure are assembled, and the anode upper end 1d is set on the battery fixing base 8 without being caulked.

Next, as shown in FIG. 3, the cathode can is loosely caulked with the secondary caulking press punch 9 to the extent that it will not be distorted, and the top part 3a of the battery cathode can is similarly fixed with the inner top part 9d of the primary caulking press punch.

At this time, the next press punch has Surin) 9a, so
The final final caulking, which is somewhat expanded, is performed by pressing with a press punch 10, as shown in FIG. 3C.

At this time, since the outside of the primary press punch and the inside of the secondary press punch are tapered, the primary press punch, which is somewhat wide, is tightened inward to swage the side surface of the anode can of the battery from the side.

As mentioned above, the present invention fixes the entire battery with a secondary press punch, and since the slit of the secondary press and the primary and secondary press punches have tapers, no strain is applied to the cathode can of the battery. Moreover, since there is no misalignment of the battery, the bottom surface of the anode can
A and side 1b can be aligned at right angles, and the gasket can be caulked with the pressure necessary to prevent leakage.

Furthermore, since the secondary press punch and the secondary press punch are integrally constructed, a carrier device for transferring the battery from the secondary press to the secondary press is not required, and the time required for this purpose can be shortened.

Next, a sealed button-type car-shaped silver oxide battery was manufactured using a crimping press machine to which the crimping method of the present invention was applied, and as a result, remarkable effects were shown as shown in the leakage resistance test results in Table 1.

In addition, the leakage test was conducted at 250°C in the temperature range of 100C to 600C.
After 1 cycle (4 hours per cycle), leakage was observed after leaving it for 1 day in an atmosphere of 23°C and 50% to 60% humidity.Cl5
Plan O).

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of a sealed button-type alkaline battery, Figures 2 a, b, and c are vertical cross-sectional views of defective products with conventional battery caulking.
Figures a, b, and c show longitudinal cross-sectional views of an apparatus illustrating the caulking method of the present invention. 1...Anode can, 2...Anode mixture, 3.
...Cathode can, 4...Cathode mixture, 5...
... Separator, 6... Electrolyte, 7...
...Insulating gasket, 1a...Bottom surface of anode can,
1b...Side surface of the anode can, 1c...Shoulder of the anode can, 1d...Top end of the anode end, 3a...
・Cathode can top part, 7a, 7b... Insulating gasket, 8... Battery fixing stand, 9... - caulking press punch, 10... Two pieces Tightening press punch, 9a...slit, 9b...-
Next caulking press punch end, 9c...-Next caulking press punch shoulder, 9d...-Next caulking press punch inner top part, 10a...Secondary caulking press Punch and curve club.

Claims (1)

[Scope of Claim for Utility Model Registration] A battery crimping device used in the manufacturing process of sealed small batteries, comprising: a battery fixing stand that holds a battery before being sealed; and a primary crimping press that loosely crimps the anode end of the battery inward. A sealed small battery manufacturing apparatus comprising a punch and a secondary caulking press punch that further caulks the loosely caulked anode end by tightening and deforming the secondary caulking press punch inward. .