JPH0517809Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> This invention relates to a spiral battery using a power generation element formed by stacking a positive electrode and a negative electrode with a separator interposed therebetween and winding them in a spiral shape.

<Prior Art> As batteries of the above type, spiral-shaped cylindrical lithium batteries, cylindrical nickel-cadmium batteries, and the like are known. Taking a cylindrical lithium battery as an example, the above-mentioned power generating element is housed in a bottomed cylindrical battery can with an insulating plate arranged at the bottom, and one electrode of the power generating element is placed in the battery can, and the other The electrodes are electrically connected to terminal plates provided at the opening of the battery can through lead plates, respectively.

In the prior art, when one electrode is connected to the battery can as described above, the structure shown in FIG. 2B, for example, is used. That is, the second insulating plate is
As shown in FIG. A, a through hole 16a is formed in the center and a notch 16b is formed in the periphery. A lead plate 17 connected to the bottom of one electrode
is bent in advance toward the insulating plate through a notch 16b formed on the peripheral edge of the insulating plate 16, and in this state is inserted into the battery can together with the power generating element 2 and the insulating plate 16, and brought into close contact with the inner bottom surface of the battery can. Then, one of the welding electrode rods is brought into contact with the lead plate portion through the conductive hole 2a and the through hole 16a formed in the center of the power generation element from the opening of the battery can, and the other electrode rod is brought into contact with the bottom of the battery can. The lead plate portion exposed in the through hole 16a formed in the center of the insulating plate is connected to the inner bottom surface of the battery can by abutting on the outer surface and by resistance welding.

<Problems to be solved by the invention> However, with the above-mentioned conventional technology, when inserting a power generating element etc. into a battery can, the position of the lead plate bent and positioned on the insulating plate tends to shift. There's a problem. As a result, the lead plate portion, which should normally be located above the through-hole of the insulating plate, shifts and, in extreme cases, is no longer exposed through the through-hole, and the above-mentioned welding between the lead plate portion and the inner bottom surface of the battery can after the power generation element is housed becomes impossible. There is a danger that the welding may become incomplete or cannot be completed at all, resulting in defective welding, or that the edge of the deviated lead plate may come into contact with the other pole of the power generating element that protrudes from the periphery of the insulating plate, causing an internal shoot. .

<Means for solving the problem> The spiral-shaped battery of this invention has a power generating element formed by overlapping a positive electrode and a negative electrode with a separator interposed therebetween and winding them in a spiral shape, and an insulating plate with a through hole at the bottom. The lead plate connected to one electrode of the power generating element is led out through the periphery of the insulating plate to the inner bottom surface of the battery can, and is positioned in the through hole of the insulating plate. Abstract: In a spiral battery in which a lead plate portion is welded to the inner bottom surface of a battery can, a groove for fixing the lead plate is provided on the inner bottom surface side of the battery can of an insulating plate, and the through hole is formed on this groove. shall be.

<Function> By providing the above-mentioned groove in the insulating plate and storing the bent lead plate portion on the insulating plate side in this groove, the lead plate is securely fixed and the above-mentioned misalignment can be prevented. will no longer occur.

<Example> In FIG. 1A, which shows an example in which this invention is applied to a spiral-shaped cylindrical lithium battery, a sheet-shaped battery is inserted into the open cylindrical battery can 1 through a separator 5. A power generating element 2 is housed in which a positive electrode 3 and a negative electrode 4 are alternately stacked and then spirally wound. An insulating plate 6 made of olefin resin such as polyethylene or polypropylene and having a thickness of about 0.2 to 0.3 mm is provided between the power generating element 2 and the inner bottom surface of the battery can. After the power generation element is housed, a non-aqueous electrolyte 9 is injected, an annular sealing gasket 10 and a disc-shaped terminal plate 11 are placed at the opening of the battery can, and the opening is squeezed and sealed.

As shown in FIG. 1B, the above-mentioned insulating plate 6 is
A groove 6d with a depth of about 0.1 to 0.2 mm is formed along the approximate center, and notches 6b and 6c are provided at both ends of the groove 6d, and furthermore, at the approximate center of the groove 6d, cutouts 6b and 6c are provided at both ends of the groove 6d. The portion is a through hole 6a. As shown in detail in FIG. 1C, this insulating plate 6 is used with its concave groove side facing the inner bottom surface of the battery can, and with the lead plate 7 housed in the concave groove 6d. That is, in the same figure, the lead plate 7 with a thickness of about 0.1 mm, one end of which is connected to the lower end of the negative electrode 4, passes through the notch 6b of the insulating plate 6 and reaches the bottom of the battery can, where it moves toward the left in the figure. It passes through the groove 6d and reaches the opposite end of the insulating plate 6, where it is bent upward in the figure and has a notch 6c formed at the same end.
located within. Here, since the negative electrode 4 connected to the battery can is placed on the outermost periphery of the power generation element 2, even if the end of the lead plate 7 on the insulating plate side slightly protrudes toward the electrode body side and comes into contact with it, this will cause an internal shoot. There is no danger at all.

In this battery configured in this way, the insulating plate 6 is tightly attached to the lower surface of the power generation element 2 with its groove 6d facing downward, and the lead plate 7 connected to the lower surface of the negative electrode is bent to form the insulating plate 6. are sequentially stored in the notch 6b, groove 6d, and notch 6c, and in this state, they are inserted into the battery can as a whole. After insertion, one side of the electrode rod for resistance welding is brought into contact with the lead plate portion exposed from the through hole 6a through the opening of the battery can, the conducting hole 2a of the power generating element 2, and the through hole 6a of the insulating plate 6. Weld this lead plate part to the inside bottom of the battery can by doing something like this.

<Effects of the invention> According to the spiral battery of this invention constructed as described above, the lead plate can be securely fixed and positional deviations when inserting the electrode body into the battery can can be eliminated. Since internal shoots and welding defects caused by this kind of positional deviation of the lead plate can be eliminated, the yield and productivity of batteries can be improved.

[Brief explanation of the drawing]

FIG. 1A is a sectional view showing a battery according to an embodiment of this invention, FIG. 1B is a perspective view of an insulating plate used in the embodiment, FIG. 1C is an enlarged view of the main part of FIG. Figure 2A
2 is a perspective view of an insulating plate used in a conventional example, and FIG. 2B is a sectional view showing the main parts of the conventional example. 1...Battery can, 2...Power generation element, 6,16...
Insulating plate, 7, 8, 17... lead plate.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A power generation element consisting of a positive electrode and a negative electrode stacked on top of each other with a separator interposed therebetween and spirally wound is arranged in a bottomed cylindrical shape with an insulating plate having a through hole at the bottom. A lead plate housed in a battery can and connected to one electrode of a power generating element is led out to the inner bottom surface of the battery can through the periphery of the insulating plate, and the lead plate portion located in the through hole of the insulating plate is guided to the inner bottom surface of the battery can. What is claimed is: 1. A spiral battery, characterized in that a concave groove for fixing a lead plate is provided on the inner bottom side of an insulating plate in a battery can, and the through hole is formed on the concave groove. 2. The spiral shaped battery according to claim 1, wherein the end of the lead plate on the bottom side of the battery can is bent from the periphery of the insulating plate toward the power generating element. 3. The spiral shaped battery according to claim 1 or 2, wherein the polarity of the outermost electrode of the power generation element is the same as that of the electrode connected to the battery can.