FI71633C - Multi-cell lead accumulator. - Google Patents

Description

NOTICE OF PUBLICATION 71633 6 (11) UTLÄGGNINGSSKRIFT '] ΌΟ ° C (45)? "Te: -Ui ^' önnctty 1 'r-ont 19 Cl 1357 ^ ^ ^ (51) Kv.ik.7int.CI.4 H 01 M 10/12 FINLAND —- FINLAND (21) Patent application - Patentansökning 781971 (22) Application date - Ansökningsdag 20.06.78 (H) (23) Starting date - Glltighetsdag 20.06.78 (41) Has become public - Blivlt offentlig 2 ^ .02-79

National Board of Patents and Registration ^ Date of display and publication - 10.10.86

Patent and registration authorities Ansökan utlagd och utl.skriften publicerad (86) Kv. application - Int. trap (32) (33) (31) Privilege claimed — Begärd prloritet 23-08.77

The Federal Republic of Germany (OE) P 2737837.6 (71) VARTA Batterie Aktiengesel1schaft, Am Leineufer 51, Hannover,

German Federal Republic of Germany (72) Hans-Joachim Golz, Hanover, Federal Republic of Germany (DE) (7 ^) Lei tzinger Oy (5 * 0 Multi-cell lead-acid battery - B1yackumulator med flera

The invention relates to a multi-cell lead-acid battery with electro-arrays consisting of zigzag-like positive and negative strip electrodes bent together into a package, with a separator between them. In particular, the invention relates to a battery suitable for aion tips, e.g. as a starting battery.

In battery technology, most of the innovations have been to the benefit of the actual product. This was the case, for example, in the early days of the development of the low-maintenance lead-acid battery and the introduction of lightweight plastic covers for starter batteries to replace the previously used hard rubber shells, leading to significant production progress and quality improvement.

In contrast, the manufacturing process is still determined by other TV steps, such as cell board casting, pulp application, shaping, board block assembly and installation. Despite the mechanical aids, many work steps still have to be done by hand, even with individual electrodes, so that the workflow as a whole has been discontinuous, which sets limits on production.

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More rational working methods have only been applicable to the production of so-called small batteries, which can be produced in mass production.

It has included the manufacture of both alkaline and small lead-acid batteries and their coil electrode devices. They wind a positive and a negative electrode strip between the separator on the electrode coil and mount it in the cell tank. The edges of the electrodes are provided with contact connections for passing through the tank. Due to the complexity of the contact bushings, such coil electrode devices are only used for single-cell batteries.

Also in electrode plates, it cannot be overlooked a clear trend that heavy mass supports, i.e. cast lead trusses, are being replaced by lighter structures such as mesh metal. In addition, mesh metals can be made as endless strips.

Electrode plates made on a mesh metal base alone, which are packed in stacks and mounted in the open in open block housings in the usual way, with the housings closed in the usual way, do not yet represent any excellent step forward for a flexible workflow.

According to US-PS 38 44 841, an attempt has been made to make it easier to connect the battery cells into compact cell blocks by disconnecting the desired number of cells from one end face of the individual cell in each case. The connection is possible due to the smallest cup-like extension of the side wall of each cell, whereby the side walls adhere in the same direction to the expanded edge in the side wall of the next adjacent cell. However, the resulting plug connection leaves a problem with the tightness of the housing with respect to the electrolyte as well as the correct electrical contact.

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The object of the invention is to provide a usable lead-acid battery which is better suited for mass production than hitherto. It is a further object to provide a method of manufacturing such a battery.

The problem is solved in that the adjacent individual cells are electrically connected to each other by a single strip electrode electrode holder guided over a large area through the cell separation wall and that the block housing closure is formed by a side wall perpendicular to the plane of the electrodes.

The manufacturing method according to the invention is characterized in that in each case the electrode support, which is guided over a large area through the cell wall partition or end wall, is provided with correspondingly divided parts without active mass, that the corresponding counter electrode parallel part is removed

In the following, the object of the invention and its manufacturing method according to the invention will be described with reference to the accompanying drawing.

Figure 1 shows a schematic plan view illustrating the object of the invention.

Fig. 2 is a perspective view of a double-cell battery housing opened from the front and also shows the flow of electrode equipment.

The block housing 1 has a set of electrodes according to the invention, consisting of a strip electrode 12, a strip electrode 13 and a separating strip 4 between them with ribs or shoulders 5. These strips are folded in a zigzag shape into a package and are pushed into the battery cells from the side. The folding edges 6 of the electrode package are perpendicular to the bottom of the battery so that gas bubbles can rise unobstructed between the electrodes.

According to the invention, both the interconnection of the cells 4 71633 and the current dissipation take place over the large area of the block housing cell separator wall 7 or end wall 8 in the electrode support regions 9 of each strip electrode. is implemented with an electrode support 3 of the strip electrode 13.

But also the end of each strip electrode can be wrapped around a lead rod and connected to it electrically conductively, for example by compression welding. From this point on, the hub penetration can be provided in a manner known per se.

The counter electrode and the separator are cut off from the transition area between the cells.

In order to produce a zigzag folded electrode package according to the invention for a multi-cell battery, the electrode carrier 2, 3f wound on rollers 10, 11, which is in the form of a conventional lead cell plate, is preferably used as an endless strip or may be formed of lead A uniform mass is attached to these electrode supports as the active substance. This is advantageous because the finished strip electrodes in battery operation change their polarity from one cell to another. The electrode supports 2, 3 thus become strip electrodes 12, 13.

By enclosing a separating strip 4 coming from a roller 14 which is very porous, but still largely insensitive to pressure, the electrode strips pass over the turning roller 15 and retract therein, after which they can be bent.

Immediately before the folds are made, parts 9 of each strip electrode 12, 13 and separator 4 are cut at predetermined distances which, after being inserted into the block housing, cross the cell wall 7 or 8 and are therefore unnecessary there, except for the electrode support required to cross the partition.

The removal of the active mass can take place by the blowing or rinsing method or also when the mass is applied, leaving the corresponding parts of the electrode support without the mass.

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In the manufacture of the battery, it is then only necessary to close the housing, which can surprisingly take place quite simply by attaching the side surface 18 by a method known as welding. Due to the heat effect, plastic penetrates both the cell partitions 7 and the block housing end 8 as well as the corresponding extensions 18, 20 through the electrode support so as to form a solid and liquid-tight connection. Prior to this heating of the lid, it may be expedient to press the electrode holder onto the separating wall with a plug and possibly carry out additional heating at this stage in order to achieve a certain penetration of the electrode holder into the cell separating wall 7 before the final lid welding.

Conventional filling and degassing openings are then made on the upper side of the block housing in line with the image plane of Fig. 1.

The surface of the electrolyte is parallel to the image plane of Fig. 1, while the barrier surface represented by line A-A is perpendicular to the surface of the electrolyte.

The necessary terminal terminals of such a battery can be formed from the electrode support exposed inside or outside the cell by squeezing or, for example, welding the terminal terminal thereto.

It is clear that the usual work steps of curing, shaping, surface treatment (e.g. by treatment with boric acid) can be performed outside the block housing. From the point of view of the continuity of the manufacturing process, it becomes particularly advantageous when the work steps after the installation of the electrode package in the block housing are performed therein itself.

The advantage of the described battery is that its manufacturing process guarantees a very low material consumption.

Claims (9)

71633 A multi-cell lead-acid battery having electrode arrays consisting of zigzag-shaped positive and negative strip electrodes folded into a package with a separator between them, characterized in that adjacent individual cells are electrically connected to each other by an electrode support of one strip electrode (12, 13). guided over a large area through the separating wall of the cells and that the block of the block housing is formed by a side wall (18) perpendicular to the plane of the electrodes, Multi-cell lead-acid battery according to Claim 1, characterized in that the electrode supports (2, 3) are formed from endless strips of mesh metal. Multi-cell lead-acid battery according to Claims 1 and 2, characterized in that the strip ends of the electrode groups are connected to the rod-shaped lead rods in an electrically conductive manner, e.g. by winding and compression welding, and in that these rods form the basis for terminal penetration. Multi-cell lead-acid battery according to Claims 1 and 2, characterized in that the outer electrical connections (16, 17) are formed on a large surface from the electrode support (2 or 3) of only one strip electrode (12 or 13) passed through the end wall (8) of the block housing (1). ). 5. A method of manufacturing a multi-cell lead-acid battery, in which electrode groups consisting of positive and negative strip electrodes with intermediate separators are folded in a zigzag package and placed in a block housing, characterized in that an electrode support with correspondingly divided parts without active mass, that the corresponding counter electrode parallel part is completely removed and that the side openings of the block housing are finally liquid-tightly closed by welding the side wall (18). 7 71633 Method according to Claim 5, characterized in that the sealing takes place by welding and that, prior to welding, the electrode support of the second strip electrode, which does not contain active mass, is slightly embedded in the separation wall or end wall of the cell. Method according to Claim 6, characterized in that the submersible part of the electrode support is heated before pressing. Method according to one of Claims 5 to 7, characterized in that the electrode supports are coated with a uniform active mass. Method according to one of Claims 5 to 8, characterized in that the strip electrodes are formed in a closed block housing. 8 71633