JPH0621153U - Manganese battery - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention forms a gas cutout passageway on the outer surface of the sealing body, and installs a valve in the middle of the passageway to discharge only the gas and stop the outflow of the electrolytic solution to prevent blister of the dry cell. The purpose of the present invention is to obtain a manganese dry battery with excellent discharge performance by preventing evaporation of the electrolytic solution. According to the present invention, a positive electrode mixture 4 having a carbon rod 3 inserted in the center is filled in a zinc can 1 through a separator 2, and a positive electrode terminal plate 10 and a sealing body 6 form an opening of the zinc can 1. It is a manganese dry battery in which 11 is bent inward and sealed. The present invention is a manganese dry battery characterized in that it has a notch passage 8 for degassing on the outer surface of a sealing body 6 and a valve portion 9 is formed in the passage 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a manganese dry battery in which a gas passage and a valve portion are formed in a sealing body.

[0002]

[Prior art]

 In a conventional manganese dry battery, a separator having a glue layer made of starch and a synthetic glue on one or both sides is housed inside a negative zinc can so that the glue layer faces the inner surface of the zinc can. The inside of it is filled with a positive electrode mixture in which a carbon rod is embedded in the center. This positive electrode mixture is composed of a molded body in which manganese dioxide, a conductive agent such as acetylene black or graphite, and an electrolytic solution of zinc chloride or ammonium chloride are mixed. The lower part of the positive electrode mixture and the zinc can are insulated with an insulating bottom paper, and the brim paper is placed on the upper part. The upper part of the carbon rod is inserted into the through hole in the center of the sealing plate, and the top part is fitted to the positive electrode terminal plate made of metal. The negative electrode terminal plate made of metal is in contact with the outer bottom of the zinc can, and the outer peripheral wall of the zinc can is covered with a heat-shrinkable outer tube made of vinyl chloride.

The AAA type and AAA type manganese dry batteries are sealed by bending the opening of the zinc can directly inward with a positive electrode terminal plate through a sealing body. Conventionally, the sealing body is made of polyethylene with a concave cross-section, and there are a one-piece method in which the positive electrode terminal plate and the sealing body are molded, and a two-piece method in which the two are separated and combined. It was folded and sealed.

[0004]

[Problems to be solved by the device]

 A conventional dry battery manufactured by the one-piece method has a poor storability. The reason for this was that the gap between the positive electrode terminal plate and the sealing body was not completely filled, so the electrolytic solution was evaporated and the inside of the battery was dried, the internal electrical resistance increased and the discharge performance deteriorated.

In addition, the dry battery produced by the two-piece method also did not have good storability. The reason for this is that the airtightness is high and the gas generated inside the battery does not escape to the outside, so the battery may rupture and burst, causing the contents to pop out.

The present invention forms a cutout passage for venting gas on the outer surface of the sealing body, and installs a valve in the middle of the passage to discharge only gas and stop the outflow of the electrolytic solution to prevent blistering of the battery and evaporation of the electrolytic solution. The purpose is to obtain a manganese dry battery with excellent discharge performance.

[0007]

[Means for Solving the Problems]

 According to the present invention, a positive electrode mixture 4 having a carbon rod 3 inserted in the center is filled in a zinc lead can 1 via a separator 2, and a positive electrode terminal plate 10 and a sealing body 6 form an opening 11 of the zinc can 1. In a manganese dry battery that is bent inwardly and sealed, the sealing body 6 has a cutout passage 8 for gas removal on the outer surface 7, and a valve portion 9 is formed in the middle of the passage 8. It is a manganese dry battery that is characterized by The sealing body 6 of the present invention is made of polyethylene resin, and is provided with a gas cutout passage 8 and a thin plate-shaped valve portion 9 having a thickness of 0.5 mm in the middle of the passage 8 to discharge only gas inside the battery. , The electrolyte has the function of not being exposed to the outside.

[0008]

[Action]

 Internal gas such as hydrogen gas and carbon dioxide gas generated in the battery where the zinc can and the positive electrode mixture contact each other accumulates between the surface of the positive electrode mixture and the sealant, and pushes up the entire sealant when the internal pressure increases. . Further, it may be rotated downward to push up the positive electrode mixture. However, the internal gas mainly goes up along the zinc can and reaches the sealing body. In the present invention, since the notch passage for gas release is provided on the outer surface of the sealing body which is in contact with the inner surface of the zinc can, these internal gases rise through the notch passage, and a thin plate-like member in the middle of the passage. Permeate through the valve portion formed in the battery and are discharged to the outside of the battery through the passage.

However, the thin plate-shaped valve portion allows gas to permeate, but does not allow liquid to permeate. Therefore, the electrolytic solution in the battery does not flow out, and the positive electrode mixture and the glue layer do not dry. Therefore, the internal resistance of the battery did not increase during storage of the battery, and the deterioration of the discharge performance during storage could be largely prevented.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 1 denotes a negative electrode zinc can, and a separator 2 having a glue layer made of starch, synthetic glue or the like formed on one or both sides is housed inside so that the glue layer faces the zinc can 1. . The inside thereof is filled with a positive electrode mixture 4 in which a carbon rod 3 is embedded in the center. The positive electrode mixture 4 is composed of a molded body in which a conductive agent of manganese dioxide and acetylene black is mixed with an electrolytic solution of zinc chloride or ammonium chloride. 5 is a hot-melt wax sealant, 6 is a polyethylene resin annular sealing body in which a gas vent passage 8 is provided in the outer peripheral surface 7 of the present invention, and a valve portion 9 having a thickness of 0.5 mm is formed in the passage 8. The carbon rod 3 is inserted into the central through hole. Reference numeral 10 is a metal positive electrode terminal plate fitted on the top of the carbon rod 3. The battery is formed by bending the opening 11 of the zinc can 1 inward and sealing it. The AAA type manganese battery of the present invention having the above-mentioned one-piece structure is assembled.

Next, using the sealing body having the vent passage and valve portion of the present invention, 200 AAA manganese dry batteries (A) and the conventional sealing body without the slit passage and valve portion are used. Other than that, the same other components were used and 200 conventional manganese dry batteries (B) of the same type were assembled. These manganese dry batteries were stored at 60 ° C for 30 days, and the number of batteries that caused an accident such as liquid leakage, detachment of the positive electrode terminal plate, or protruding contents was examined and summarized in Table 1.

[0012]

[Table 1]

Further, 10 of these dry batteries after storage were discharged at 20 ° C. and 15Ω, and the duration time thereof is shown in Table 2.

[0014]

[Table 2]

As a result of these tests, even when the battery of the present invention was stored at 60 ° C. for 30 days, it did not leak or the positive electrode terminal plate did not come off, and the gas generated inside the battery was discharged to the outside. You can see that Also, in the discharge test, it has a duration of 250 minutes at 15Ω, which shows that the electrolytic solution is sufficiently present inside the battery. That is, the sealing body of the present invention having the cut passage and the valve portion discharges the internal gas, but the electrolytic solution necessary for the discharge is stopped by the valve portion and is not discharged.

[0016]

[Effect of device]

 As described above, the manganese dry battery assembled by using the sealing body of the present invention provided with the gas vent passage on the outer surface of the sealing body and the valve section formed in the middle of the passage has the passage and the valve section inside the battery. The generated gas is discharged, but the electrolytic solution is not discharged. Therefore, it does not leak even when stored at high temperatures, and has excellent discharge performance after storage.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of an essential part of an embodiment of a manganese dry battery of the present invention.

FIG. 2 is a perspective view of a main part of a sealing body used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Zinc can 6 ... Sealing body 7 ... Outside surface 8 ... Passage 9 ... Valve part 10 ... Positive electrode terminal plate 11 ... Opening part

Claims (1)

[Scope of utility model registration request] 1. A zinc can (1) is filled with a positive electrode mixture (4) having a carbon rod (3) inserted in the center thereof through a separator (2), and a positive electrode terminal plate (10) and a sealing body ( 6) and a manganese dry battery in which the opening (11) of the zinc can (1) is bent inward for sealing, the sealing body (6) is provided on the outer surface (7) for degassing. A manganese dry battery having a passage (8) and a valve portion (9) formed in the middle of the passage (8).