JP2575989Y2 - Mercury-free alkaline batteries - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mercury-free alkaline battery having no fluctuation in operating voltage during discharge.

[0002]

2. Description of the Related Art As shown in FIG. 4, an alkaline dry battery separates an anode mixture 4 and a cathode gel 2 in an anode can 5 by a separator 1 and seals a current collector 6 fixed to a cathode terminal 7 with a sealing gasket. 3, and the sealing gasket 3 provides insulation and sealing between the anode can 5 and the cathode terminal 7. Normally, as shown, the separator 1 has a straight cylindrical shape, and has a considerable space between the upper end surface of the cathode gel 2 and the sealing gasket 3.

[0003] Generally, the granular Zn in the cathode gel 1 is formed into a mercury amalgam in order to uniformly dissolve the surface of the Zn particles and increase the hydrogen overpotential at the time of electric discharge. There is something.

[0004]

[Problem to be solved by the invention] In a battery containing mercury,
Since mercury maintains good contact between Zn particles and the like, there is no problem such as a fluctuation in operating voltage during discharge.

However, in a mercury-free alkaline battery, when gas is generated in the cathode gel 2 during discharging, there is a considerable space between the upper end surface of the cathode gel 2 and the sealing gasket 3 as described above. Gel 2 swells, current collector 5
The contact between the Zn powder in the cathode gel 2 and the contact between the Zn powders in the cathode gel 2 became worse, and the internal resistance increased. Further, the current collector 5 itself may be discharged, and the voltage may be lower than the cutoff voltage at the beginning of the discharge.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate disadvantages such as fluctuations in operating voltage during discharge and abnormal discharge, which are problems specific to mercury-free alkaline batteries.

[0007]

According to the present invention, in order to achieve the above object, the upper portion of the separator is bent inward, and a sealing rib is formed on the sealing gasket at a position facing the upper surface of the cathode gel. The holding rib presses the inside bent portion on the upper part of the separator.

Further, according to the present invention, the upper part of the separator is bent inward, the sealing gasket is formed with a separator pressing rib at a position facing the upper surface of the cathode gel, and a pressing ring plate is further interposed on the upper surface of the cathode gel, The press plate is pressed by the inside bent portion of the upper portion of the separator, and the inside bent portion of the upper portion of the separator is pressed by the press rib of the sealing gasket.

[0009]

[Operation] The bent portion inside the upper part of the separator pressed by the holding rib of the sealing gasket and the holding ring plate interposed on the upper surface of the cathode gel prevent the cathode gel from expanding during battery discharge. The contact between the electrons and the Zn powder in the cathode gel or the contact between the Zn powders in the cathode gel is maintained, thereby preventing an increase in internal resistance and a fluctuation in operating voltage.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention shown in FIG.
The upper portion of the separator 1 is bent inward to form an inner bent portion 1a. The sealing gasket 3 has separator pressing ribs 8 formed at locations facing the upper surface of the cathode gel 2. The inner bent portion 1a on the upper part of the separator 1 is pressed by the pressing rib 8. Therefore, even if the cathode gel 2 is about to expand, there is an inner bent portion 1a of the separator 1 above the cathode gel 2, and the inner bent portion 1a is pressed by the pressing rib 8 of the sealing gasket 3. The cathode gel 2 is not allowed to expand freely. When the expansion of the cathode gel 2 is prevented as described above, the contact between the current collector 6 and the Zn powder in the cathode gel 2 or the contact between the Zn powders in the cathode gel 2 are maintained well.

FIG. 2 shows another embodiment of the present invention.
In addition to the above configuration, a pressing ring plate 9 is further interposed on the cathode gel 2, and the pressing ring plate 9 is pressed down at the inner bent portion 1a on the upper part of the separator 1. Therefore, the cathode gel 2 cannot be further expanded due to the additional pressing ring plate 9.

FIG. 3 is a diagram showing discharge performance. The dotted line shows the case of the conventional product having the configuration shown in FIG. On the other hand, in the configuration of FIG. 1 shown by a solid line, there is no such a case, but a slight fluctuation of the operating voltage is observed. However, in the configuration of FIG. 2, there is no such variation.

Incidentally, for each of them, 1Ω continuous 20 ° C.
Number of operating voltage fluctuation at discharge (Test I), 2Ω continuous 2
The results of examining the number of operating voltage fluctuations at 0 ° C. discharge (Test II) are shown in Table 1 below.

[0014]

[Table 1]

[0015]

According to the first aspect of the present invention, an inner bent portion is formed by bending an upper portion of the separator inward, and a presser for pressing the inner bent portion of the upper portion of the separator at a sealing gasket portion facing the upper surface of the cathode gel. Forming the ribs is relatively easy to carry out, and the present invention, which can eliminate the disadvantages such as the fluctuation of the operating voltage and the abnormal discharge caused by the mercury-free alkaline batteries by such simple means, is not a practical use. The effect is extremely excellent.

Further, it is also relatively easy to interpose a press ring plate on the upper surface of the cathode gel and press the press plate at the inside bent portion of the upper part of the separator, thereby making it possible to avoid the above-mentioned disadvantages. Elimination can be achieved more reliably.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a mercury-free alkaline dry battery according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a main part of a mercury-free alkaline dry battery according to a second embodiment of the present invention.

FIG. 3 is a diagram showing discharge performance.

FIG. 4 is a sectional view showing a main part of a conventional mercury-free alkaline battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Separator 1a Inside bent part of separator upper part 2 Cathode gel 3 Sealing gasket 4 Anode mixture 5 Anode can 6 Current collector 7 Cathode terminal 8 Pressing rib 9 Pressing ring

──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Michitsugu Nakajima 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd. (56) References JP-A-63-285868 (JP, A) 58-94265 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01M 6/08

Claims (2)

(57) [Scope of request for utility model registration] An anode mixture (4) and a cathode gel (2) in an anode can (5) are separated by a separator (1), and a current collector (6) fixed to a cathode terminal (7) is fitted into a sealing gasket (3). In an alkaline dry battery in which insulation and sealing between the can 5 and the cathode terminal 7 are performed, the upper part of the separator 1 is bent inward, and the separator gasket 3 is formed with a separator pressing rib 8 at a position facing the upper surface of the cathode gel 2. A mercury-free alkaline dry battery characterized in that a holding rib (8) presses an inner bent portion (1a) of the upper part of the separator (1). 2. An anode mixture 4 and a cathode gel 2 in an anode can 5 are separated by a separator 1, a current collector 6 fixed to a cathode terminal 7 is fitted to a sealing gasket 3, and the anode gasket 3 is sealed by the sealing gasket 3. In an alkaline dry battery in which insulation and sealing between the can 5 and the cathode terminal 7 are performed, the upper portion of the separator 1 is bent inward, and the sealing gasket 3 is formed with a separator pressing rib 8 at a position facing the upper surface of the cathode gel 2. A press ring plate 9 is interposed on the upper surface of the cathode gel 2, the press ring plate 9 is pressed at the inside bent portion 1 a of the upper portion of the separator 1, and the press rib 8 of the sealing gasket 3 is pressed inside the separator 1. A mercury-free alkaline battery, wherein the bent portion 1a is pressed.