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Method of short-circuiting a malfunctioning elementary electrochemical cell of a filter-press structure

An electrochemical and filter press technology, which is applied in the field of short-circuiting the single electrochemical battery of the filter press structure that has failed, and can solve the problems of low-path parts and less prominent electrical characteristics.

Inactive Publication Date: 2005-02-16
NUVERA FUEL CELLS EURO SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But in many cases, there is a clear disadvantage of electrical short-circuiting of individual cells according to the teaching in EP629015: the following description follows the specific case of polymer membrane fuel cells, since this disadvantage is more severe and pronounced in this type of application
This phenomenon is even more pronounced today with the widespread use of very thin bipolar plates; the latter again for the purpose of minimizing weight and volume, but these thin bipolar plates provide more low path section
Furthermore, among the most commonly used materials for plate construction, there are several materials that are very good from a corrosion protection point of view such as stainless steel, but are not so outstanding for electrical characteristics, further adding to the problem

Method used

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  • Method of short-circuiting a malfunctioning elementary electrochemical cell of a filter-press structure
  • Method of short-circuiting a malfunctioning elementary electrochemical cell of a filter-press structure
  • Method of short-circuiting a malfunctioning elementary electrochemical cell of a filter-press structure

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Embodiment 1

[0024] A typical embodiment of the short circuit according to the invention concerns the bypassing of individual cells belonging to a fuel cell stack according to figure 1 The filter press type setting shown in . The battery stack comprises a single cell (1) defined by a bipolar plate or terminal conductive plate (2) such as a metallic material such as stainless steel, aluminum or aluminum alloys, nickel or nickel alloys, titanium or titanium alloy, optionally coated with an anti-corrosion conductive paint. But bipolar plates can also be made of non-metallic materials such as graphite or conductive plastics. The fluid tightness between one cell and the next cell and towards the outside is ensured by suitable gaskets 3 , such as plastic or metal spacers. A frame-shaped flat gasket is shown, but it will be apparent that the present invention could also be used with an O-ring type of sealing system, or with a differently formed gasket. figure 1 Also shown is a current collecto...

Embodiment 2

[0030] Another aspect of the invention resides in the design of certain components in conjunction with electrochemical cell configurations, such as figure 1 The fuel cell stack shown in order to implement the above short circuit process.

[0031] Figure 2 shows a configuration according to a particular embodiment of the invention figure 1 A cross-section of a fuel cell, one of the stack elements in ; it will be understood that the constructive concepts disclosed hereinafter are equally applicable in the case of electrolyzers or other electrochemical cells.

[0032] In particular the cell in Figure 2, showing its frame-shaped gasket (3), only partially shown, the central window of which constitutes the container for the current collector (4), laminated to the bipolar plate (2), The path for clamping the fastening rod (8) is preset externally with respect to the main surface. In this case, by penetrating the groove (10) in any point of the cell side wall of the respective curr...

Embodiment 3

[0034] Another aspect of the invention consists in a method of short-circuiting a battery, wherein the presence of fastening bars is provided inside the active area of ​​the battery or in any case on the main surface of the battery.

[0035] image 3 Illustrates constructions according to specific embodiments of the invention figure 1 A cross-section of a fuel cell, one of the elements of the cell stack; it should be understood that the structural concepts disclosed later apply equally to the case of electrolyzers and other electrochemical cells. in particular image 3 , showing a frame-shaped gasket (3), only partially shown, whose central window constitutes the container for the current collector (4) and is laminated to the bipolar plate (2), pre-prepared in the main surface of the cell Establish the path of the fastening rod (8). In this case, in order to make the short-circuit groove more easily, reduce the amount of material to be replaced and extend said groove, it is...

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Abstract

It is described a method of electrical by-passing of an elementary electrochemical cell, for instance a fuel cell, inserted in a filter-press structure delimited by electrically conducting bipolar sheets and provided with perimetral sealing gaskets, comprising short-circuiting the cell by insertion of a conductive material within recesses realised by perforation of materials interposed between the bipolar sheets. The gaskets and the bipolar sheets may be provided with sites predisposed to the perforation, for instance notches for a drilling tip, or gasket regions of decreased hardness.

Description

technical field [0001] The present invention relates to a method of short-circuiting a single electrochemical cell of a failed filter-press structure. Background technique [0002] Those skilled in the art already know the process of electrolysis or generation of electrical energy based on the filter press type structure constituting the electrochemical cell assembly. Typical single-cell electrochemical cells performing such processes often have a restrictive thickness to minimize energy consumption. A single cell is typically defined by two conductive plates with a pair of gaskets between them to seal the periphery, an ion exchange membrane, a pair of electrodes, and a pair of current collectors / distributors. Holes are made in the plate and / or in the gasket connected to the anode and cathode chambers by means of distribution channels. Multiple single cells are conventionally assembled in filter press mode to form an electrolysis device or electrical energy generator. Thu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B9/23C25B15/00H01M8/04H01M8/10H01M8/24
CPCH01M8/2465C25B15/00Y02E60/50H01M8/04223H01M8/241H01M8/04H01M8/24H01M8/2483H01M8/0273
Inventor 丹尼尔·菲斯安东尼奥·图偌保罗·彼内利
Owner NUVERA FUEL CELLS EURO SRL