JPS6136066Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a button-type sealed battery that uses silver oxide, silver peroxide, mercury oxide, manganese dioxide, etc. as the anode active material, zinc etc. as the cathode active material, and an alkaline aqueous solution as the electrolyte. This relates to the sealing device.

As shown in FIG. 6, the button-type sealed battery has an anode can 20 and a cathode can 21 integrally connected through a packing 22, and contains an anode active material 23, which is a compacted powder body, and its reinforcing material. The anode can 2 is made up of a stainless steel annular pedestal 24, a separator 25, and a cathode active material 26 made of zinc or the like.
The vicinity of the opening 20b in the peripheral wall 20a of 0 is bent inward to seal the opening and prevent electrolyte from leaking.

As the sealing means, a sealing device 30 configured with a punch 27, a die 28, a knockout pin 29, etc. as shown in FIG. 7 is used. An anode can 20 having a straight peripheral wall 20a,
The anode can 21 with the packing 22 fitted on the outer periphery is assembled, the battery with each battery component inserted therein is inserted, and the punch 27 is moved in the direction of arrow D to punch the vicinity of the opening 20b of the peripheral wall 20a as shown. One is known that is compressed inward and sealed.

However, with the above means, in order to seal properly in order to improve leakage resistance, it is necessary to bend the vicinity of the peripheral wall 20b of the battery with a large compressive force. The load will be applied in the axial direction. As a result, an excessive compressive load acts on the anode active material 23, which is a compacted powder body, causing damage to the anode active material 23, resulting in deterioration of the characteristics of the battery.

This idea was developed in view of the above-mentioned conventional drawbacks, and provides a sealing device for a button-type sealed battery that can prevent damage to the battery structure and also enable accurate sealing and improve leakage resistance. The purpose is to

Embodiments of this invention will be described below with reference to the drawings.

In FIG. 1, 1 and 1 indicate a pair of sealing molds, and 2 indicates a moving mechanism. The moving mechanism 2 includes, for example, a rotating shaft 3 and a sprocket 4 fixed to the rotating shaft 3.
The chain 5 is connected to the sealing molds 1 and 1 at both ends 5a and 5b of the chain 5, and is sealed by the operation of a drive source (not shown). The molds 1 and 1 are moved back and forth in the directions of arrows A and B within the same plane.

As shown in FIGS. 2 to 4, the sealing molds 1, 1 have clamping end surfaces 9 that are opposed to each other with a distance 1 between them so that they can come into contact with the peripheral wall 8 of the anode can 7 of the button-type sealed battery 6 in the axial direction. is forming. Therefore, the battery 6, which is clamped by the clamping end surfaces 9 in line contact with the peripheral wall 8 of the anode can 7 in the axial direction, has both ends in the axial direction, that is, the anode can 7 and the cathode can 10, rolling bearings on the support ring. When the sealing molds 1, 1 are moved in the direction of arrow A by being held by a cylindrical rotatable holding member 11 (not shown) that is loosely fitted in Rotate to.

One side of the clamping end surface 9 of each of the sealing molds 1, 1 is in contact with the vicinity of the opening 8a of the peripheral wall 8 continuously in the longitudinal direction, and the vicinity of the opening 8a is directed inward as shown in FIG. A molding surface 12 is formed that is gradually bent and sealed into a predetermined shape.

In the above configuration, the battery 6, in which the anode can 7 and the cathode can 10 are held by the rotatable holding member 11 as shown in FIG. Arrow C as you move in the direction
While rotating in the direction, the vicinity of the opening 8a is gradually curved by the molding surface 12 and sealed as shown in FIG.

As described above, the sealing molds 1, 1 that have molded the molding surfaces 12 are moved in different directions within the same plane, and the vicinity of the opening 8a of the peripheral wall 8 is curved and sealed. Sealing type 1 in
The contact area between the clamping end surface 9 of the anode can 7 and the anode can 7 is small (line contact), so that the sealing force can be reduced. Moreover, since the direction of the sealing force is in the direction in which the rigidity of the battery structure 13 inserted into the battery 6 is large, that is, in the radial direction, the battery structure 13 is not damaged and the characteristics of the battery are deteriorated. can be prevented.

Furthermore, since the sealing is time-divided, the sealing force for the time-divided portions can be reduced, and it is important to apply the necessary sealing force sufficiently, allowing for accurate sealing and improved leakage resistance. do.

In the above embodiment, an example is described in which the sealing molds 1, 1 are moved in different directions to seal the seal, but in this invention, one of the sealing molds 1, 1 is fixed and the other is moved. Even if it is configured so that it is possible, sealing is possible, and the same effect as the above embodiment is achieved.

Furthermore, as shown in FIG. 5, even if the sealing dies 1, 1 are formed in an arcuate shape and one of the sealing dies 1, 1 is configured to be movable in the circumferential direction, the sealing dies 1, 1 may be configured to be movable in the circumferential direction. In particular, the installation area of the device can be kept small.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view of the sealing device according to this invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view taken along the - line, and Fig. 4 is a sectional view taken along the line -.
The figure is a sectional view taken along the same line, FIG. 5 is a schematic plan view showing another embodiment of this invention, FIG. 6 is an explanatory sectional view of a button-type sealed battery, and FIG. 7 is a conventional sealing device. FIG. 1, 1...Sealed type, 2...Movement mechanism, 6...Button type sealed battery, 7...Anode can, 8...Peripheral wall, 8
a... Near the opening, 9... Clamping end surface, l... Interval.

Claims (1)

[Scope of utility model registration request] While holding both ends of the anode can 7 and cathode can 10 of the button-type sealed battery 6 in the axial direction with a rotatable holding member 11, there is a gap l that allows the circumferential wall 8 of the anode can 7 to abut in the axial direction. The clamping end surfaces 9 formed on the pair of sealing molds 1, 1 having peripheral walls continuous in the longitudinal direction or circumferential direction are opposed to each other, and the sealing molds 1, 1 are
At least one of them is connected to the moving mechanism 2 so as to be movable in the longitudinal direction or the circumferential direction with the above-mentioned interval l, and the clamping end surfaces 9 of each of the sealing molds 1 and 1 are
Continuously in the longitudinal direction or circumferential direction on one side and in contact with the vicinity of the opening 8a of the peripheral wall 8 and in the vicinity of the opening 8a
1. A sealing device for a button-type sealed battery, characterized in that a molding surface 12 is formed to gradually bend and seal the battery into a predetermined shape.