MXPA97008024A - Galvanic pile with dire impression - Google Patents

Abstract

The present invention relates to a galvanic cell or cell comprising an external metal vessel that on its outer side has an insulating layer and a decorative layer, which have been applied directly on the metal vessel by a printing and / or coating process.

Description

GALVANIC STACK WITH DIRECT PRINTING Description of the invention The invention relates to a galvanic cell or battery comprising an external metal vessel which on its outer side has an insulating and decorative layer. Batteries or galvanic cells, which are mainly used in household appliances operated in electrical form, have an electrically insulated sheath and two contacts that are generally located opposite one another. The electrical circuit of the household appliance is closed by the contact areas *. The insulation between the contact areas is provided to prevent batteries or cells from being discharged inadvertently. Thus, for example, many household appliances are provided with a coiled spring as an electrical contact area, and jacket-type or jacket-type insulation protects the two terminals of the cell or battery against a possible short circuit due to an inadvertent tilt of the battery. said spiral spring. The insulating envelope of the galvanic cells or cells also protects them against environmental influences that lead to scratches, stains or traces of corrosion in the cell or cell vessel. The insulating sheath of the cells or galvanic cells is also provided with inscriptions and advertising material. On the one hand, this decoration contains information about the electrochemical system used, the size of the cell or battery, the voltage of the cell or battery, the manufacturer, the country of origin and the warranty period, but also, by the way in which is designed, is intended to provide an appropriate advertising message. Documents DE 1671802 and DE 2845242 disclose metal wrappings or jackets for cells or galvanic cells having on their outer side a decorative layer. These metal casings are used primarily for batteries or galvanic cells of the Leclanché type, to prevent electrolyte from leaking out of the cell after it has been completely discharged. In the case of batteries or galvanic cells of the Leclanché type, there is the possibility that holes are formed in the zinc anode designed to be the vessel, when the time comes when the battery will be completely discharged. To protect the batteries or cells of the above-mentioned type against filtration (of the electrolyte to the outside), they are provided, by interposition of an insulating layer, with a metallic envelope provided with a decorative layer. The above-described veneering technique is also used in galvanic cells or cells of the alkali-manganese type. To increase the capacity of the cells or cells for some time have been using the labels in the form of film or adhesive labels disclosed by the documents US 4,869,978, WO / 19835 and US 4,801,514 for the purposes of electrical insulation and decoration, since by means of them it is possible to reduce the thickness of the envelope. If the dimensions of the cell or galvanic cell are kept constant, it is therefore possible to use a larger container of cell or cell, and therefore to introduce a greater quantity of active compound in the cells or cells. Known methods for electrically insulating jacketing of galvanic cells or cells are an important factor in the cost thereof, and battery manufacturers are also interested in reducing the thickness of the insulating layer. The object of the invention is to specify galvanic cells or cells and methods for their manufacture, in which the known methods for caching galvanized cells or cells are dispensed with. According to the invention, the object is achieved by means of a galvanic cell or battery comprising an external metal vessel, in which the insulating and decorative layer was applied directly on the metal vessel by means of a printing and / or coating process. The batteries or galvanic cells are advantageously manufactured in such a way that before forming the metal vessel, we proceed to apply the insulating and decorative layer (on the material to form the glass). In a further development of the invention, the galvanic cells or cells are manufactured in such a way that at least the insulating layer is applied to the prefabricated metallic vessel. A further refinement of the invention consists in applying the insulating and decorative layer on the metallic vessel of the completely finished galvanic cell or cell, that is, on galvanic cells or cells that have been filled with active and sealed materials. In the process, galvanic cells or cells are manufactured by applying the insulating layer by means of electrophoretic coating, spray coating, coating by powder application processes, by means of knife application or by immersion processes, and by applying the decorative layer by means of printing processes such as distorted printing (ie printing that takes into account the subsequent deformation of the article during processing), silk screen printing on a flat bed, silk screen printing on a rotating bed, printing type offset or printing by pressure roller. The use d = such coatings allows manufacturing cycles with high rates and reduces the risk of damage to batteries or cells, since it does not require a heat treatment for e. efficient curing d = the coating layer. The new galvanic cells or cells, and the methods to manufacture them, have the following advantages: 1. Continuous production that can be carried out at high speed 2. Saving in the costs of the materials by eliminating the plastic film label 3. Simplification of the manufacturing stages due to a lower manufacturing depth, since the prefabrication of the printed film tape, the cutting and application stages, and the transportation and storage are omitted. 4. Achieving a greater capacity of the cell or cell, since the coating of the vessel is thinner than a film label, being that as a result it is possible to use a larger cell vessel with larger volume available for electrochemically active material. 5. High flexibility to select the design of the cell. battery or cell.

The invention is illustrated by the following examples: EXAMPLE 1 Completely filled stacks or cells were provided with the insulating and decorative layer in a single step of silk screen printing on a flat bed, by direct printing of the rotating metal vessel. The printing was carried out with a conventional printing ink held at a very high viscosity index and based on polyacrylates and polyurethanes. The drying was carried out by means of a hot air current of approximately 60 ° C. A layer thickness of 10 to 20 μm of the dry printing ink conferred an adequate insulating strength.

EXAMPLE 2 To provide the base coat for finished cells or cells to be completed, these were coated by application of atomized spray with epoxy resin, polyurethane resin or a polyacrylate as an insulating layer. The pre-coated cell or cell cups were then provided with a decorative layer by silk screen printing on a flat bed, according to Example 1. The printing ink used was a UV curable coating that cures in seconds . The coating achieves an insulating resistance comparable to that of adhesive labels.

EXAMPLE 3 Before completing the completion of the cells or cells, the metal vessels were provided with a base coating as an insulating layer, according to example 2. The decorative layer was applied to these cells or pre-coated cells by rotary offset printing, using inks of conventional printing. A layer thickness of approximately 20 μm conferred an insulating strength that satisfies practical requirements.

Example 4 l? A glass d = stack or cell as coated by atomization c_c? N a. layer, resilient (elastic) base resistant to abrasion. This is a bake at 180 ° C. The vessels that are obtained are used for the manufacture of cells Q cells to the same for that the raw material s_in coating for lSIs vaSOS. The coating that involves baking. Y. the resilience (elasticity) of the coating layer prevents it. To the coating splinter and descostre in the pearl or drop in the region of the pearl. The subsequent application of decoration by offset printing is carried out using a UV curable coating system (layer thickness typically from I to 5 μm). This can be complemented with the application of an external outer layer of clear varnish (thickness of the layer typically of U2 a-ifl μ). F. The use of a UV curable coating has the advantage that curing does not require the pil to be subjected to thermal stress.

EXAMPLE 5 On top of the finished cell or scale, apply a UV-curable base coat (for example, 20 μm by SOO ion, roller.) This follows the application of the decorative layer (or generally 2-10 μmJ). by offset printing, being possible and It is necessary to apply h = seven colors eja a single operation. To finish, an external final layer is applied. also in the form of a light-curable system Ifí OO? The purpose is to obtain additional mechanical protection and increase the brightness.

Example 6 On top of the finished pillar, a Coating system gives 2 components (two-component) by spray coating PQr. The subsequent decoration formation is carried out by offset printing with a TJV-curable coating. An additional roll coating is carried out with a transpartent coating curable by UV rays. coating that contains fluorescent or absorbent components of the UV range. An advantage of this is that the printed stack or bristle in this way can be recognized and classified by scanning or electronic scanning systems.

Claims (1)

1. CLAIMS A galvanic cell or battery comprising an external metal vessel that on the outer side has an insulating layer and a decorative layer, characterized in that the insulating and decorative layer is applied directly on the metal vessel by a process of printing and / or coating. A method for manufacturing a cell or cell according to claim 1, characterized in that the insulating and decorative layer is applied to the metal material before shaping the metal vessel. A method for manufacturing a cell or cell according to claim 1, characterized in that at least the insulating layer is applied to the prefabricated metal vessel. A method for manufacturing a cell or cell according to claim 1, characterized in that the insulating and decorative layer is applied to the metal vessel of the finished galvanic cell or cell. The method for manufacturing a cell or cell according to any of claims 2 to 4, characterized in that the insulating layer is applied by electrophoretic coating, coating by spray by spray, coating by application of powder, application by means of a knife or by immersion processes, and the decorative layer is applied by printing processes such as distorted printing, silk screen printing on a flat bed, silk screen printing on a rotary bed, offset printing or printing by pressure roller. A galvanic cell or cell according to claim 1, characterized in that the insulation layer and the decorative layer are coatings curable by UV rays.