EP1273066A1

EP1273066A1 - Enclosed layered stack, method for producing said enclosed layered stack and use of said method

Info

Publication number: EP1273066A1
Application number: EP01933572A
Authority: EP
Inventors: Hartmut Michel; Klaus Schoch; Werner Erhardt
Original assignee: Epcos AG
Current assignee: TDK Electronics AG
Priority date: 2000-03-30
Filing date: 2001-03-15
Publication date: 2003-01-08
Also published as: KR20020091153A; DE10015823A1; WO2001076002A1; JP2003529944A; US20030077506A1

Abstract

The invention relates to an enclosed layered stack and to a method for producing said enclosed layered stack from a strip material (1) and several intermediate layers (2). Said method comprises the following steps: a) the strip material (1) is wounded onto a mandrel (3) in order to produce a multilayered winding, the intermediate layers (2) being bent about at most 180 DEG during the winding process and arranged on top of each other, between the winding layers (4); b) the layered stack is clamped into a housing (6) in such a way that the intermediate layers (2) are pressed together without buckling. The invention also relates to the use of this method for producing batteries, accumulators or capacitors. The invention can be used particularly advantageously for producing electrolyte capacitors with cuboidal housings.

Description

description

Cased layer stack, method for producing the cased layer tape and use of the method

The invention relates to a packaged layer stack with intermediate layers and a method for producing the packaged layer stack. The invention further relates to the use of the method.

Known methods for producing packaged layers, such as winding or stacking, are used in particular for the production of batteries, accumulators or electrolytic capacitors. An electrolytic capacitor essentially consists of a stack of anode and cathode plates, which lie alternately one above the other and between each of which an absorbent, electrically non-conductive insulating layer, such as paper, is arranged. The insulating layer is impregnated with a liquid electrolyte. By installing the layer stack in a housing, the anodes and the cathodes are pressed together, care being taken to ensure that the contact pressure is uniform over the entire cross-sectional area of the stack. This requirement arises from the fact that the conduction mechanism in the electrolyte compared to the conduction of

Electrons in metals are inhibited, which means that the distance over which charges are to be transported is particularly important. In order to obtain firmly defined, uniform component properties, it is therefore important that the distance between the

Electrodes (anode and cathode) is as homogeneous as possible. Furthermore, a geometry of the housing is required, which is very easy to stack, with particular care being taken to make good use of the volume used when interconnecting several capacitors. In this regard, cylindrical housings are unsuitable, while housings delimited by flat surfaces, such as cuboids, are preferred.

A known method for producing housed layer stacks is to wind four tapes one above the other on a round roll. Two of the tapes can be metallic, for example, and the remaining tapes can be an absorbent, insulating material. After the winding mandrel has been removed, the winding produced in this way takes the form of a hollow cylinder which is now preferably pressed into a cylindrical housing. This procedure has the disadvantage that the shape of the housing is not optimal for the use of space when several stacked layers are interconnected.

Another possibility is to press the winding m into a prismatic housing. As a result, the strips are kinked or stretched or compressed in particular in the edge regions of the housing. This is disadvantageous if one of the tapes is the metallic electrode of a capacitor, since these electrodes are very sensitive to kinks and are often damaged in the process.

Another known method for producing packaged layers is to simply stack the individual layers one above the other. Although damage to sensitive metal electrodes can be prevented in this way, this method is very difficult to implement in terms of production technology and is in particular not suitable for producing large quantities.

The aim of the present invention is therefore to provide a housed layer stack in which the damage to metal electrodes is avoided. It is also an aim to provide a method with which the packaged layer stack can be produced simply and quickly without the layers being damaged during installation in a housing.

This goal is achieved according to the invention by a packaged layer stack according to claim 1. A procedure for

Manufacture of the housed layer stack and use of the method can be found in the further claims.

The invention relates to a packaged layer stack with superposed, separate layers

Intermediate layers, between which a wound strip material runs and which are pressed against a side surface of a housing without kinks.

Such a layer stack has the advantage that the

Intermediate layers cannot be damaged by kinking. The layer stack also has the advantage that it can be produced using a combined winding / stacking process.

The invention also provides a method of manufacturing a packaged layer stack that is a combination of winding and stacking. The starting point for the process is, on the one hand, a strip material and, on the other hand, several intermediate layers. In a first step, the strip material is wound on a winding mandrel, creating a multi-layer winding. During winding, the intermediate layers between two winding layers are arranged one above the other, so that the strip material and intermediate layers lie alternately one above the other. Care is taken to ensure that the intermediate layers on the winding mandrel by at most

Are bent 180 degrees. In a further step, the layer stack thus produced is clamped in a housing, so that the intermediate layers are pressed against a side surface of the housing. Due to the bending of the intermediate layers, which does not exceed 180 degrees, the layer stack can be clamped in such a way that the intermediate layers are pressed together without kinks. This invention

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housed layer stack can be used. This is the case, for example, in the production of an electrolytic capacitor, where anode intermediate layers alternate with cathode intermediate layers. A type of intermediate layer can now be supplied on each side of the winding mandrel and arranged between the layers of the strip material. The two positions at which the respective type of intermediate layer is arranged are spatially separated from one another, so that advantages result from this, particularly with regard to machine technology (feeding intermediate layers from magazines).

The method according to the invention can be used particularly advantageously for the production of batteries, accumulators or capacitors, where it is important to make optimal use of the available space even when interconnecting several batteries, accumulators or capacitors, since it is the damage-free installation of the layer stack m one of parallel Limited and therefore stackable housing allowed for walls.

The invention is explained below with reference to

Exemplary embodiments and the associated figures explained in more detail.

Figure 1 shows a method according to the invention using a large winding mandrel in schematic cross section.

Figure 2 shows an inventive method under

Use of a small winding mandrel in a schematic cross section.

FIG. 3 shows a layer stack according to the invention, which is produced according to the method shown in FIG. FIG. 4 shows a method according to the invention using a flat mandrel in a schematic cross section.

FIG. 5 shows a method according to the invention using a two-ply strip material in a schematic cross section.

FIG. 6 shows a method according to the invention using a two-layer tape, the two layers of the tape being wound up offset by half a turn of the winding mandrel.

FIG. 1 shows a method according to the invention for producing a packaged layer stack, in which a round winding mandrel 3 with a diameter D of 0.5 m is used

Tape material 1 is wound up. The winding mandrel 3 is preferably made of steel, since this material has the necessary mechanical rigidity. An example of a tape material used in the manufacture of electrolytic capacitors is an absorbent layer such as paper made of cellulose or a nonwoven made of polytetrafluoroethylene. During the winding of the strip material 1 onto the winding mandrel 3, intermediate layers 2 are placed on the outermost winding layer 4. During winding, a tensile stress is exerted on the strip material 1, so that the intermediate layers 2 do not have to be further fixed, but are fixed solely on account of the contact pressure which the stretched strip material 1 exerts on the winding mandrel 3. The strip material 1 is, for example, in the manufacture of an electrolytic capacitor such that it is able to suck in a liquid electrolyte due to its capillary forces. The width B of the intermediate layers 2 is, for example, 1.5 cm, so that approximately 50 layer stacks can be produced on the winding mandrel 3 shown as an example with a diameter of 0.5 m. The thickness of the strip material 1 is typically between 50 and 500 μm. The intermediate layer 2 can be a metal electrode ß

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opposite sides of the winding mandrel 3 m stacked between the strip material 1 and the outermost winding layer 4 inserted.

FIG. 5 shows a method according to the invention for producing a packaged layer stack using a flat winding mandrel 3 and a two-layer strip material 7, 8. When winding the strip material 7, 8, the inner layer 7 is spread out in a V-shape from the outer layer 8, so that a first type of intermediate layers 9 between the inner layer of the

Tape material 7 and the outermost winding layer 4 and a second type of intermediate layers 10 can be arranged between the layers of the tape material 7,8. This special procedure doubles the number of intermediate layers 9, 10 introduced into the stack per revolution.

FIG. 6 shows a method for producing a packaged layer stack according to FIG. 5, but the inner layer of the strip material 7 and the outer layer of the strip material 8 are wound up offset by half a turn of the winding mandrel 3. This has the advantage in terms of machine technology that two different types of intermediate layers 9, 10 can be inserted between the layers of strip material 7, 8 from spatially separated positions. The different types of intermediate layers 9, 10 are fed from opposite sides of the winding mandrel 3.

The invention is not limited to the exemplary embodiments shown, but is defined in its most general form by claims 1 and 2.

Claims

claims

1. Cased layer stack with superimposed, separated intermediate layers (2), between which a wound strip material (1) runs and which are pressed against a side surface (5) of a casing (6) without kinks.

2. A method for producing a packaged layer of a strip material (1) and a plurality of intermediate layers (2) with the following steps: a) winding the strip material (1) on a winding mandrel (3) to form a multi-layer winding, the intermediate layers (2) during of the wickein are bent by a maximum of 180 ° and are arranged one above the other between the winding layers (4) b) clamping the layer stack in a housing (6) such that the intermediate layers (2) are pressed without kinks against a side surface (5) of the housing (6).

3. The method according to claim 2, wherein a round winding mandrel (3) is used, the

Diameter (D) is at least three times as large as the width (B) of the intermediate layers (2) and on the circumference of which several intermediate layers (2) are arranged side by side on a winding layer (4), and after the completion of the winding the strip material ( 1) is cut through between the adjacent stacks of intermediate layers (2).

4. The method according to claim 3, wherein a winding mandrel (3) is used, the cross section of which is a regular polygon, the

Side lengths are equal to the width (B) of the intermediate layers (2).

5. The method according to claim 2, wherein a round mandrel (3) is used, the diameter (D) is at least half as large as the width (B) of the intermediate layers (2) and on the opposite sides of each a stack of superimposed intermediate layers ( 2) is arranged, and the winding is pulled from the winding mandrel (3) after its completion.

6. The method according to claim 2, wherein a flat winding mandrel (3) is used, the width of which is equal to the width (B) of the intermediate layers (2) and on the broad sides e of which a stack of intermediate layers (2) is arranged.

7. The method according to claim 6, wherein a two-ply strip material (1) is used, the layers (7, 8) of which are spread out in a V-shape during winding, and wherein on one side of the mandrel (3) in each case an intermediate layer (2) between the uppermost Winding layer (4) and the inner layer (7) of the strip material and between the inner and the outer layer (8) of the strip material (1) is arranged.

8. The method according to claim 7, wherein the layers of the strip material (7, 8) are wound offset by half a turn of the winding mandrel (3) and wherein on opposite sides of the

An intermediate layer (2) is arranged between the layers (7, 8) of the strip material (1).

9. The method according to claim 8, wherein two types of intermediate layers (9, 10) are used and wherein the first type (9) from one side of the

Winding mandrel (3) and the second type (10) from the opposite side of the winding mandrel (3) are applied to the winding.

10. The method according to claim 2 to 9, wherein a cuboid housing (6) is used.

11. The method according to claim 2 to 10, wherein a winding mandrel (3) made of steel is used.

12. The method according to claim 2 to 11, wherein copper, aluminum or nickel layers are used as intermediate layers (2).

13. The method according to claim 2 to 12, wherein as a band material (1) a band of absorbent plastic or cellulose or from a

Polytetrafluoroethylene membrane is used.

14. The method according to claim 13, wherein the strip material (1) after the clamping of the layer stack in the housing (6) is filled with a liquid electrolyte.

15. Use of the method according to claim 2 to 14 for the production of batteries, accumulators or capacitors.