JPS59224057A - Button-type alkaline battery - Google Patents

Abstract

PURPOSE:To prevent any defective leading between a negative mixture and a negative can so as to improve the performance of a button-type alkaline battery by mixing a specified amount of extended copper wire having a specified diameter into a negative mixture principally consisting of amalgamated zinc. CONSTITUTION:Extended copper wire having a diameter of 10-50mum is mixed into a negative mixture 3 principally consisting of amalgamated zinc; the amount of the extended copper wire added is 0.01-3.0% of the weight of the negative mixture 3. The thus prepared mixture is then packed into a negative can 1 also serving as a negative lead. Next, a positive mixture 4 principally consisting of silver oxide or the like, a separator 5 and a liquid-holding member 6 are combined in a positive can 2. After that, the positive can 2 is placed over the negative can 1 with a gasket 7 interposed to seal the battery, thereby constituting a button-type alkaline battery. Owing to the above constitution, the extended wire touches the negative can 1 and works as a lead for the negative mixture 3. As a result, the performance of the battery can be improve without causing any defective leading between the negative mixture 3 and the negative can 1 even when part of zinc changes into zinc oxide having a low conductivity with the progress of electric discharge.

Description

[Detailed description of the invention] Industrial applications The present invention relates to improvements in button-type alkaline batteries.

Prior Art The square rod mixture for conventional button-type alkaline batteries consists of granular frozen zinc dispersed in a glue and an electrolyte.

I'm looking forward to it. In this case, if the inside of the square bar can is not completely filled with the zinc chloride, the electrolyte, and the electrolyte, a lead failure between the square bar mixture and the square bar can is likely to occur.

On the other hand, if the void inside the square bar can is made small, the alkaline solution is likely to leak. Therefore, in order to produce a battery with good electrical characteristics and good leakage resistance, it was necessary to manufacture it under strict conditions. The problem of lead failure is more serious after the discharge has progressed than due to the discharge effect because zinc oxide, which has poor conductivity, increases in the negative electrode as the discharge progresses.

Purpose of the Invention The present invention prevents the above-mentioned defects in the electrical characteristics of the battery, and furthermore, even if the battery is assembled with many gaps in the negative rod can, the electrical characteristics of the battery are good, so that leakage is prevented. A battery with good liquid characteristics is obtained.

Structure and operation of the invention FIG. 1 is a cross-sectional view of the constituent battery of the present invention, which includes a 1-pole square can, a 2-pole square can, a 6-pole negative electrode mixture, a 4-pole square electrode mixture, a 5-pole separator, 6 pcs of impregnating material, 7 pcs of gas... As shown in FIG. 2, a copper wire 8 is inserted into the negative electrode mixture 3 of the upper MF'. 8 copper wires, amalgamated with mercury, 8 copper wires above, in contact with negative electrode can 1, negative electrode mixture 3
Acts as a lead. Because of this copper wire 8, even if the contents in the negative electrode can 1 are small, a lead failure between the negative electrode can 1 and the negative electrode mixture 3 will not occur. Further, even if part of the zinc changes to zinc oxide, which has poor lightning conductivity as the discharge progresses, the lead between the negative electrode mixture 3 and the negative supply can 1 can be sufficiently secured. Since the void inside the negative electrode can be enlarged, there is less chance of the contents overflowing from the negative electrode can 1 during assembly, making it easier to manufacture a battery with good leakage resistance.

Example As an example of the present invention, a wire with a diameter of 10 μm was added to the negative electrode mixture.
The manufacturer produced a battery in which copper wire was added in an amount of 0.2 weight percent of the negative electrode mixture, and the porosity in the square rod can was 10.

The battery size is 36 mm in thickness and 79 mm in outer diameter.

The copper wire was inserted into a ball as shown in FIG. Copper wires that come into contact with zinc oxide are amalgamated by the mercury of zinc oxide.

Effect of the invention Next, Table 1 shows the effects of the above-mentioned example batteries.

Table 1? +, = 500 In the table, the conventional battery is a battery of the same size as the example made using a negative electrode mixture without the addition of copper wire.The measured characteristics are the closed circuit voltage at -10°C. Load resistance 200
In the case of Q, a battery whose voltage across both ends is 1.2V or more is considered to be a good product, and the number of defective batteries for each 500 batteries is shown.1. Ta. This measurement value was measured approximately 90 days after the battery was manufactured. As is clear from Table 1, the battery of the present invention can reduce the defective rate of electrical characteristics by 11.

Figure 3 shows an example of a 200Q constant resistance discharge curve at -10°C. With conventional batteries, the pressure drops rapidly as soon as discharge begins, as in the case of 1s9, and the battery life is also short. - As shown by the solid line 10, the second embodiment of the battery according to the present invention has less voltage drop due to discharge and has a longer duration.

From the above, the effects of the present invention are clear.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the battery of the present invention, Fig. 2 is a sectional view of the debt can and debt mixture of the invention, and Fig. 3 is a sectional view of the battery at -10°C.
An example of a 0Ω constant resistance discharge curve is shown. 1. Negative electrode can 6. Impregnating material 2. Stop rod can 7. Gas container/soto 3. Negative electrode mixture 8. Copper wire 4. Stop rod mixture 9. Conventional example 5. Separator 10 ...Embodiments of the present invention and above Applicant Sendai Precision Materials Research Institute Co., Ltd. Figure 1 Figure 2

Claims (2)

[Claims] (1) A camellia mixture containing frozen zinc as the main ingredient, a stopping rod mixture containing silver oxide, manganese dioxide, etc. as the main ingredient, alkaline electrolyte,
A button-type alkaline battery that has a positive electrode can that also serves as a stop lead, a negative electrode can that also serves as a negative lead, a gasket, and a separator, and is characterized by having a copper wire mixed in the mixture. (2) Previous H? The rolled copper wire is mixed into the frozen zinc. A button-shaped alkaline lightning or pond with a pupil as set forth in claim 1, characterized in that the wire diameter is 10 μm to 50 μm and the wire weight is 0°01 to 30 inches of the weight of the negative electrode mixture.