DE1061852B - Galvanic primary element - Google Patents

Description

The invention relates to a galvanic primary element which has an outer covering made of insulating and electrolyte-impermeable material, preferably plastic.

In a known construction, there is a rivet on the bottom of the plastic jacket surrounding the cell embedded, which serves as a negative current conductor. This element is costly to manufacture and has also has the disadvantage that due to the small contact area between rivet and zinc cup, the electrical Contact between the two is poor.

The object of the invention was to avoid these deficiencies and to prevent the electrolyte with certainty leaks from the cell and damages the surrounding housing or other parts. This object is achieved according to the invention solved in that one at the bottom of the negative, preferably made of zinc electrode attached approach passed through an opening in the plastic casing and like a rivet bolt is compressed tightly together with the shell.

In an element according to the invention, the outer shell is only pierced by the approach which can have a very small diameter. The edge joint between the approach and the shell is accordingly of short length and therefore holds tightly. A good electrical contact of the negative Electrode with an external conductor is still guaranteed, because that approach and Electrode consist of one piece, no contact resistance between them can occur.

Another advantage of a cell according to the invention is its ease of manufacture. It is easily possible, for example with a cup-shaped negative electrode the approach in one In the process of spraying with the cup yourself. In a second step, the electrode is turned into a Plastic cup inserted and riveted to it. The further production of the element then takes place in the usual way.

Some possible embodiments of a primary element according to the invention are shown in the drawings.

1 shows a dry cell of the usual type with a centrally arranged positive current collector b, preferably a carbon pin, depolarizer compound and electrolyte c, which are accommodated in a cup d made of electronegative metal, preferably zinc. The metal cup d is tightly surrounded on the outside by a cup e made of insulating, electrolyte-impermeable material, preferably plastic, which is higher than the metal cup d. The upper end of the element is formed by a lid i, which consists of the same material as the cup e and is tightly sealed with it.

Applicant:
Pertrix Union

Company with limited liability,
Ellwangen / Jagst

Werner Riedl and Wilhelm Wild, Ellwangen / Jagst, have been named as inventors

bound, for example welded or glued. In ^ him a positive contact cap α is tightly embedded, preferably injected. An expansion space m for the electrolyte is provided in the element above the depolarizer mass and electrolyte c. The metal cup d has a shoulder h on the bottom, which is passed through the cup e and compressed like a rivet bolt.

FIGS. 2 to 4 show further advantageous embodiments of an element according to the invention.

In Fig. 2, the compressed approach h holds a contact disk g on the bottom of the element. In Fig. 3, an annular sealing washer /, preferably made of rubber, is arranged between the bottom of the metal cup d and the outer cup e , which again seals the passage opening for the approach h through the cup e against the escape of electrolyte. In Fig. 4, a seal / made of an electrolyte-impermeable, insulating material, preferably plastic, which essentially has the shape of a hollow cylinder, surrounds the part of the positive current conductor b passed through the expansion space and separates it from the expansion space m. At the same time, its foot k presses open the depolarizer mass c and holds it in place in the element.

It has also proven to be beneficial to make the expansion space at least equal to the volume of the electrolyte paste of the unused element. It has been shown that if a mono cell is short-circuited, its electrolyte volume doubles within 3 days, but then remains constant. If one sees in the element a sufficiently large expansion space for this increase in electrolyte, then greater internal pressures cannot develop, which would lead to an increase

909 578/93

rupture of the outer shell of the element and lead to the leakage of electrolyte. Then there is also a The element cannot swell.

Claims (5)

Patent claims: 1. Galvanic primary element, which is tightly enclosed by a sheath, preferably made of plastic, an expansion space being arranged above the depolarization mass, characterized in that a projection (h) molded on at the bottom of the negative electrode (d), preferably made of zinc passed through an opening of the envelope (e) and nietbolzenartig with the casing sealingly ^to-1 is S sammengestaucht. 2. Galvanic primary element according to claim 1, characterized in that the extension (I ι) with its compressed edge holds an annular bottom contact disc (g) on the outside of the envelope. 3. Galvanic primary element according to claim 1 and 2, characterized in that an annular sealing washer (/), preferably made of rubber, is arranged between the bottom of the negative electrode (d) and the outer casing (e). 4. Galvanic primary element according to claim 1 to 3, characterized in that the expansion space (to) at least equal to the volume of the electrolyte paste of the unused element is. 5. Galvanic primary element according to claim 1 to 4, characterized by a current collector (b), for. B. the carbon pin, the positive electrode enclosing the hollow cylindrical seal (/), which closes the current conductor (b) from the expansion space (m) . Considered publications:
French Patent No. 973 083;
U.S. Patent Nos. 2,411,272, 2,505,014, 585,922. 1 sheet of drawings © 909 578/93 7.