JPS5844532Y2 - Through terminal type flat battery - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a through terminal type flat battery.

Conventionally, this type of battery is as shown in Fig. 1.
A metal case 1 loaded with an anode mixture 2 and a metal sealing lid 7 having a through-hole cathode terminal 4 whose electrical insulation is held through a sealing material 6 and filled with a cathode active material 10, respectively. are welded to each other at the open end portions of the cathode active material 10 and are disposed along the inner surface of the sealing lid 7 to electrically insulate and isolate the cathode active material 10 from the sealing lid 7. A cup-shaped insulating isolation member 8 is provided, and a lower open end surface of the cup-shaped insulating isolation member 8 allows the anode mixture 2 to be
The separator 3 is configured to press the peripheral edge of the separator 3 interposed between the cathode active material 10 and the cathode active material 10 from above.

The anode mixture 2 is generally press-molded into pellets in advance.

Further, as the sealing material 6, glass, ceramics,
Epoxy resin etc. are used.

The metal sealing lid 7 has a through hole formed in the center of the cup-shaped metal lid member 5, and allows the cathode terminal 4 to pass freely through the through hole, and between the cathode terminal 4 and the through hole. The sealing material 6 is filled in the terminal 4 to hold the terminal 4 therein.

The upper end surface of the through-hole cathode terminal 4 serves as a cathode terminal, and the lower end thereof electrically contacts the cathode active material 10 via the current collector plate 9 .

The cup-shaped insulating isolation member 8 is made of a molded product of polyethylene, polypropylene, nylon, or the like.

This isolation member 8 has two functions as described above.

That is, by being formed into a cup shape and disposed along the inner surface of the sealing lid 7, the sealing lid 7 and the cathode active material 10 are electrically insulated and isolated, and the lower opening end surface thereof presses the periphery of the separator 30, causing the periphery of the separator 3 to rise, or the anode mixture to bypass the outer periphery of the separator 3 and move to the cathode side, resulting in natural consumption of battery capacity. to prevent such things from happening.

When the sealing lid 7 and the metal case 1 are welded to each other, the insulating isolation member 8 has its cylindrical peripheral wall portion 8a vertically compressed by about 5 to 20%. The peripheral edge of 3 is elastically pressed.

It must be strong enough to withstand the pressing force at this time; if this pressing force is weak, problems such as lifting of the separator or migration of the anode mixture to the cathode side will occur as described above.

However, it has been found that in the conventional through-terminal type flat battery as shown in FIG. 1, when the pressing force of the separator is increased, the following two defects occur.

The first reason is that when the sealing lid 7 is placed on the metal case 1 and the opening ends are butted together, the cylindrical peripheral wall of the isolation member 10 is compressed in the vertical direction, and as a result, the peripheral wall slightly inwards. It seems to be deformed towards the direction.

If welding is carried out with a welding current in this state, the air in the vicinity will expand rapidly, which tends to cause the lower open end of the insulating isolation member 8 to partially bend inward.

In the first place, in this type of through-terminal type flat battery, the isolation member 8 must be formed into a cup shape in order to insulate and isolate the sealing lid 7 and the cathode active material 10. The second defect is that it was difficult to create a structure that would allow sufficient performance.Since the cup-shaped insulating isolation member 8 is filled with the cathode active material 10 inside, it takes a certain amount of effort to ensure the filling volume. It was necessary to form it thinly,
For this reason, there was a risk that the corner A of the lower opening end would strongly bite into the separator 3 and cause the separator 3 to be locally destroyed.

This invention was made in order to improve the above-mentioned conventional defects, and its purpose is to reliably hold down the peripheral edge of the separator by making relatively simple changes to the structure. For example, to prevent the anode mixture from going around to the cathode side, and to prevent the separator from being locally destroyed without significantly impairing the filling volume of the cathode active material. The object of the present invention is to provide a highly reliable feed-through terminal type flat battery which is free from natural wear and tear during storage.

In order to achieve the above objectives, this device has a metal case loaded with an anode mixture, a through cathode terminal held through an electrically insulating sealing material, and a metal case filled with a cathode active material. The metal sealing lids are welded to each other at their respective opening ends to be integrated, and the sealing lid is disposed along the inner surface of the sealing lid to create a connection between the sealing lid and the cathode active material. A cup-shaped insulating isolation member for electrical isolation is provided,
Further, in the through terminal type flat battery, the peripheral edge of the separator interposed between the anode mixture and the cathode active material is pressed from above by the lower opening end surface of the cup-shaped insulating isolation member. The insulating and isolating member is made relatively hard, and the inner peripheral surface of the insulating and isolating member is inclined inward so that the wall thickness in the horizontal direction is directed closer to the open end than the cylindrical peripheral wall above it. The pressing area of the separator is expanded by gradually increasing the pressure inward according to the pressure.

Hereinafter, preferred embodiments of this invention will be described based on the drawings.

Note that common or corresponding parts in each figure are indicated using the same reference numerals.

FIGS. 2 and 3 show an embodiment of a through terminal type flat battery according to this invention.

The battery shown in the figure, particularly the battery shown in FIG. 3, is basically the same as the conventional battery shown in FIG.

That is, a metal case 1 loaded with an anode mixture 2 and a through cathode terminal 4 held through an electrically insulating sealing material 6.
and a metal sealing lid 7 filled with the cathode active material 10 are welded together at their respective open ends to be integrated, and are disposed along the inner surface of the sealing lid 7. A cup-shaped insulating isolation member 8 is provided to electrically insulate and isolate between the sealing lid 7 and the cathode active material 10, and the anode mixture 2 is further provided at the lower open end surface of the cup-shaped insulating isolation member 8. The peripheral edge of the separator 3 interposed between the electrode and the cathode active material 10 is pressed from above.

Here, the difference from the conventional one is that, as shown in each partial embodiment in FIG. It is formed larger toward the inside than the cylindrical peripheral wall portion 8b, so that the enlarged lower end surface of the lower opening presses against the upper end surface of the peripheral edge of the separator 3.

The cross-sectional shape of the lower opening end portion 8a of each cup-shaped insulating isolation member 8 is formed in an inwardly abbreviated shape.

Further, in the embodiment, the vertical wall thickness of the horizontal portion of the L-shaped end portion is made thinner toward the inner side.

In the embodiment shown in FIG. 3, a cup-shaped insulating isolation member 8 having the shape of the lower open end 8a of FIG. 2C is used.

In this embodiment, the wall thickness B of the cylindrical peripheral wall portion 8b is 0.3 to 0.
．． 6mm, and the horizontal wall thickness C of the opening is 0.5~
The length is set to about 1.2 mm, and it is made of a relatively hard material such as nylon, and a relatively large curved surface as shown by the symbol R is formed inside the L-shape.

As described above, in the through-terminal type flat battery according to this invention, the horizontal wall thickness at the lower open end 8a of the cup-shaped insulating isolation member 8 used therein is greater than that at the cylindrical peripheral wall 8b. By increasing the pressing area of the separator 3 inwardly, the peripheral edge of the separator 3 can be kept elastically pressed in a stable state, and the pressing force can be applied over a wide area. Due to the dispersion, there is no possibility that the separator 3 will be locally destroyed, and the loss of the filling volume of the cathode active material 10 inside the cup-shaped insulating isolation member 8 can be kept to a minimum.

As mentioned above, the feedthrough terminal type flat battery according to this invention is
By simply making a slight change in the shape of the lower open end of the cup-shaped insulating isolation member used there, it is possible to hold the separator stably and reliably. It is possible to prevent the separator from going around to the cathode side, and it is also possible to reliably prevent local destruction of the separator without significantly reducing the effective power generation capacity. Reliability can be greatly increased.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an example of a conventional through-terminal type flat battery, Fig. 2 A-C is a partial sectional view showing an embodiment of each main part of the through-terminal type flat battery according to this invention, and Fig. 3 is a cross-sectional view showing an example of a conventional through-terminal type flat battery. FIG. 1 is a sectional view showing an embodiment of a through terminal type flat battery according to this invention. 1...Metal case, 2...Anode mixture,
3...Separator, 4...Through cathode terminal, 5...Lid member, 6...Sealing material, 7
... Sealing lid, 8 ... Cup-shaped insulating isolation member, 9 ... Current collector plate, 10 ... Cathode active material, 8a ...・Lower opening end, 8b...
・Cylindrical peripheral wall part.

Claims (1)

[Scope of utility model registration request] A metal case loaded with an anode mixture and a metal sealing lid having a through cathode terminal held through an electrically insulating sealing material and filled with a cathode active material are attached to each open end. and a cup-shaped insulating isolation member is provided along the inner surface of the sealing lid to electrically insulate and isolate between the sealing lid and the cathode active material. Further, in the through terminal type flat battery, the peripheral edge of the separator interposed between the anode mixture and the cathode active material is pressed from above by the lower opening end surface of the cup-shaped insulating isolation member. The cup-shaped insulating isolation member is made relatively hard, and the horizontal wall thickness at the lower opening end of the cup-shaped insulating isolation member is made so that the inner circumferential surface of the insulating isolation member is inclined inwardly, so that the wall thickness in the horizontal direction is lower than that of the cylindrical circumferential wall above the cup-shaped insulating isolation member. A through-terminal type flat battery, characterized in that the pressing area of the separator is enlarged by gradually increasing inward toward the open end.