FI75238C - FOERFARANDE FOER FRAMSTAELLNING AV ETT BATTERI. - Google Patents

Description

75238

Method of making the battery

The invention relates to a method of manufacturing a battery, which battery comprises successively stacked flat cells containing a zinc anode, an alkaline electrolyte and a cathode in the form of a rune-carbon extrudate in contact with a metal terminal.

The known 9 V batteries, which are 40 mm high, comprise a number of relatively long and narrow cylindrical elements. These elements are relatively difficult to manufacture and the rejection rate is correspondingly relatively high. In addition, there will be a large use of partial volume and, moreover, we will be bound in terms of dimensions.

For this reason, there has been a shift to the use of flat ken-15 stacks stacked in succession - cf. for example, Danish Patent Application No. 5318/78. It achieves 22% better volume utilization. The individual cell is encapsulated in a plastic cup. However, a particular problem is the establishment of a satisfactory contact between the runic stone-carbon-20 extrudate (cathode mass) and the metal terminal in question.

The invention has shown how a satisfactory contact can be established between a rune-carbon extrudate and a metal terminal in a simple manner, and this object is achieved according to the invention by bending the metal terminal slightly more than 90 ° along two opposite flat edges, introducing the rune-carbon extrudates from the side. Thus, the battery becomes suitable for mass production at the same time, when the runic stone-carbon extrudate can then be protected from the inside along the two opposite edges of the folded end plate. The end plate should be folded only slightly more, primarily 1-3 ° more than 90 ° along the two opposite edges.

In order to facilitate the lateral insertion of the runic stone-carbon extrudate, the extrudate may preferably be rounded at an angle of 2,75238. Considering that the runic stone-carbon extrudates must be able to expand, they are about 0.06 to 0.08 mm narrower than the metal terminal when inserted.

The invention will be explained in more detail below with reference to the drawing, in which: Figure 1 shows a part of a battery showing a lead-through to a metal terminal connected to a runic stone-carbon compact, and Figure 2 shows the metal terminal itself.

The alkaline battery shown in Figure 1 comprises a series of flat cells stacked in succession. The separate cell contains a zinc anode, an alkaline electrolyte and a cathode in the form of a rune-stone-carbon extrudate 1. The Rune 15 coal-carbon compact is in contact with the metal terminal 2. However, a satisfactory contact must be established between the Rune-stone coal 1 and the metal terminal 2 when this connection determines the short-circuit current. If a rectangular terminal is used with folds along all four edges, the folds will turn outwards and the connection will be insufficient. According to the invention, a folded metal body has been used - cf. Figure 2 with folds along two opposite edges that fold in about 1-3 °. Thus, a sufficiently good compression of the runic stone-coal compact 1 is obtained. The terminal 2 must, of course, be of a suitably flexible material, such as nickel-plated iron. Thus, a short-circuit current of 3-5 A is obtained. Previous circular cells did not have such a problem at all when the electrode mass in question was introduced under pressure and thus the necessary contact was made, taking advantage of the fact that the cylindrical body was able to absorb the pressure in question without going out on the contact.

The method according to the invention is furthermore suitable for mass production of 3 75238 when the end piece is symmetrical and the crushed stone-coal extrudates can be pushed in from the side when they are rounded at the edges.

The terminal may be provided with an additional fold 4 4, when it can also be used to make a certain contact with the bottom surface. The width of the extrudates is about 0.06 to 0.08 mm smaller than the width of the terminal, while their height increases because the extrudates expand slightly due to the release of stresses upon addition of electrolysis. In the actual formation, the height of the terminal is 2.7 mm, the length 17.5 mm and the width 13.08 mm. The thickness of the material is about 0.1 to 0.3 mm.

Claims (4)

75238 A method of manufacturing a battery comprising sequentially stacked flat cells comprising a zinc anode, an alkaline electrolyte and a cathode in the form of a runic-carbon-press (1) in contact with a metal terminal (2), characterized in that the metal terminal ( 2) is bent slightly more than 90 ° along the two opposite flat edges, whereby the rune-10 coal-carbon extrudates (1) are introduced from the side into the inside. Method according to Claim 1, characterized in that the runic stone-carbon extrudates (1) are slightly narrower than the metal terminal (2). Method according to Claim 2, characterized in that the runic coal-carbon extrudates (1) are 0.06 to 0.08 mm narrower than the metal terminal (2). Method according to Claim 1, characterized in that the terminal (2) is folded along two opposite edges 1 to 3 ° inwards.