JPH0620286Y2 - Flat type battery with lead terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a flat battery with lead terminals of a type in which an annular gasket is sandwiched between a battery can and a terminal plate.

<Prior art> For a cylindrical battery such as a cylindrical lithium battery or a flat battery such as a flat non-aqueous electrolyte battery, a battery case is constructed by combining a cylindrical battery can with a bottom with a dish-shaped terminal plate. The power generation element is housed in this battery case. Taking a flat type non-aqueous electrolyte battery as an example, a positive electrode mixture is arranged on the battery can side having a bottomed short cylindrical shape, and a negative electrode made of a light metal such as lithium is arranged on the terminal plate side. Both electrodes are faced to each other via a separator and assembled, and an annular gasket made of synthetic resin is interposed between the inner peripheral side of the battery can and the peripheral edge of the terminal plate to curl the opening of the battery can inward. Then, the gasket is pinched between the opening of the battery can and the peripheral portion of the terminal plate.

By the way, since this type of battery adopts the above-mentioned configuration, a projecting portion (terminal surface for current extraction) formed at the periphery of the opening of the battery can and the center of the terminal plate near the periphery of the opening of the battery can.
And are very close together, so there is a high risk of an external short at this point. Especially in the case of flat type batteries,
This tendency is large because the projecting portion of the terminal plate must be formed near the periphery of the opening of the battery can in order to increase the amount of power generation elements accommodated in the battery case.

In order to prevent such an external short circuit, generally, a battery can opening is insulated by a heat-shrinkable tube applied to the outer periphery, an insulating seal is attached to the opening, or a battery can opening is formed. A structure is used in which an insulating paint, for example, an epoxy-based or silicon-based synthetic resin paint is applied.

<Problems to be solved by the invention> However, in the case of using a heat-shrinkable tube, a process of covering the outer periphery of the battery can with a heat-shrinkable tube and then heating to shrink the tube is required. In addition to complicating the process, in the case of a flat type battery, the tube end may reach up to the terminal plate, which causes a problem that a poor contact with the terminal on the battery device side is likely to occur. Also, when a lead terminal is connected to the terminal surface of this flat type battery to make a battery with lead terminals, the lead terminal 7 connected to the terminal surface of the flat type battery 1 as shown in FIG. As described above, the heat-shrinkable resin tube 8 must be bent by the thickness of the tube, and there is a problem that the adhesion between the lead terminal and the battery terminal surface is significantly reduced.

Also, in the case of a sticker type, the curl of the battery can opening is a curved surface and the area is quite small, so it is easy to remove the sticker attached to this curl, while the type using an insulating paint is used. However, since the coating material is easily peeled off due to the effect of the sealant interposed between the opening of the battery can and the gasket, all of these types are inferior in terms of reliability.

<Means for Solving Problems> The battery of the present invention has a battery case in which a cylindrical battery can with a bottom and a terminal plate with a plate are combined, and the power generating element is housed therein. In a flat battery that is curled and pinched with an annular gasket between it and the peripheral edge of the terminal plate, the exposed portion of the gasket on the outer surface of the battery has an annular end that covers the curled portion of the battery can. The gist is that one end of the insulator is welded and lead terminals are fixed to the terminal surface of the battery can and the terminal surface of the terminal plate, respectively.

<Operation> By using the above means, the process is not complicated, the above-mentioned contact failure does not occur, and reliable insulation of the battery can opening peripheral edge and the protruding portion of the terminal plate is performed with high reliability. Can be achieved. Further, even if the lead terminal is fixed to the battery terminal surface, this insulator is not located on the battery terminal surface, and therefore it is not necessary to bend the lead terminal.

<Example> An example in which the present invention is applied to a flat type non-aqueous electrolyte battery will be described below.

Example 1. In the flat type non-aqueous electrolyte battery 1 shown in FIG. 1 (A),
A positive electrode mixture 1b and a negative electrode 1d are provided inside a battery case formed by combining a battery can 1a having a short cylinder with a bottom and a terminal plate 1e having a dish shape.
And a power generation element that is opposed to each other via a separator 1c. An annular gasket 1f made of a synthetic resin such as polypropylene or 6-6 nylon is located between the inner peripheral side of the battery can opening and the peripheral edge of the terminal plate. By curling the gasket 1f, the gasket 1f is pinched between them, and the power generating element in the battery is hermetically housed.

On the other hand, in the portion of the gasket 1f exposed from the battery can opening and the peripheral portion of the terminal plate to the outer surface of the battery, a chamfer having a hole with an inner diameter that is slightly larger than the outer diameter of the terminal plate protrusion is formed in the center. One end of an insulator 2 made of a polyethylene molded body having a cup shape and a wall thickness of about 0.2 mm is fixed. The other end of the insulator 2 contacts with or covers at least the gasket side portion of the curl portion 1g outside the battery can, and covers this portion. As a method of fixing the insulator 2 to the gasket 1f in this way, as shown in FIG. 1 (A), the heating jig 4 is brought into contact with the insulator upper surface brought into contact with the gasket upper surface, and this jig is used. One end of the insulator and the gasket 1f may be heat-welded by heating, or they may be welded by ultrasonic welding, high-frequency welding, impulse welding or the like (3 in the figure is a welded portion). At this time, since the insulator 2 can be easily welded by using a predetermined heating jig 4 or welding means, workability is improved. Further, these may be adhered and fixed by a sealant-resistant adhesive. FIG. 1 (B) is a view of the flat battery with an insulator thus produced, viewed from the upper side in FIG. 1 (A), and the curl of the battery can and the terminal plate 1e are reliably separated by the insulator 2. ing.

Example 2. FIG. 2 (A) shows another example in which the present invention is applied to a flat type non-aqueous electrolyte battery. In this example, as an insulator, the thickness is
A hollow flat plate-shaped (donut-shaped) insulator 5 made of a polyethylene sheet having a diameter of about 0.2 mm and larger than the battery diameter is used. It is fixed by being welded or adhered to a portion exposed to the outer surface of the battery from between the opening of the battery can and the peripheral portion of the terminal plate. The other end on the outer peripheral side of the insulator 5 extends annularly outward in the horizontal direction to cover the curl portion 1g of the battery can 1a from above.

2 (B) and 2 (C) show a state in which the lead terminal 6 is welded to the flat type non-aqueous electrolyte battery with an insulator (“X” in the figure is a welded portion), and the insulator 5 is a terminal plate protrusion. Since it does not project upward from the negative electrode terminal surface of the portion and does not protrude below the positive electrode terminal surface outside the bottom of the positive electrode can, the lead terminal 6 is directly welded to each terminal surface without bending. Are welded in close contact with each other. As a result, it is possible to prevent the decrease in the adhesion to the battery terminal surface due to the bending of the conventional lead terminal 7 as shown in FIG.

Needless to say, the present invention can be applied to a cylindrical battery as well.

<Effect of device> As described above, according to the flat battery with lead terminal of the present invention, insulation between the peripheral part of the battery can opening and the protruding part of the terminal plate can be achieved with high reliability, and contact between these parts can be achieved. It is possible to prevent the occurrence of an external short circuit. Further, since it is only necessary to weld the insulator to the gasket, workability is excellent.

Furthermore, since there is no need to bend the lead terminals,
The adhesion between the lead terminal and the battery terminal surface is improved.

[Brief description of drawings]

FIG. 1 (A) is an illustration of an embodiment of the present invention, FIG. 1 (B) is a plan view of the embodiment, FIG. 2 (A) is an illustration of another example, and FIG. 2 (B) is another. FIG. 2 is a plan view showing a state where lead terminals are attached to the battery terminal surface of the example, FIG. 2 (C) is a side view thereof, and FIG. 3 is an explanatory view showing a conventional example. 1 ... Flat non-aqueous electrolyte battery, 2, 5 ... Insulator, 6, 7 ...
Lead terminal.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidenori Nagura, 5-16-11, Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (56) References

Claims (1)

[Scope of utility model registration request] 1. A power generating element is housed in a battery case which is a combination of a bottomed cylindrical battery can and a dish-shaped terminal plate, and an opening of the battery can is curled inward to form a peripheral portion of the terminal plate. In a flat battery formed by sandwiching an annular gasket between the two, one end of an annular insulator whose other end side covers the battery can curl portion is welded to the exposed portion of the outer surface of the gasket of the gasket, A flat-type battery with lead terminals, wherein lead terminals are fixed to the terminal surface of the can and the terminal surface of the terminal plate, respectively.