Electrical device, in particular microbattery, and method for the production
An electrical device includes: a housing part made of a metal and including a feedthrough therethrough, an opening of the feedthrough, a first region, and a second region, the opening receiving a conductive material or a conductor in a glass material or a glass-ceramic material, wherein: (i) the conductive material has a first coefficient of expansion α 1 , the glass material or the glass-ceramic material has a second coefficient of expansion α 2 , and the housing part has a third coefficient of expansion α 3 , the third coefficient of expansion α 3 being always greater than the second coefficient of expansion α 2 ; or (ii) the first region including a width W that is substantially perpendicular to the axis of the at least one opening, the width W of the first region being always greater than a thickness D 2 and a thickness D E of the second region; or (iii) a combination of (i) and (ii).
1 . An electrical device, comprising:
a housing part of a housing, the housing part being made of a metal and including a feedthrough therethrough, at least one opening as a part of the feedthrough, a first region, and a second region, the metal of the housing part being iron, an iron alloy, an iron-nickel alloy, an iron-nickel-cobalt alloy, KOVAR, steel, or stainless steel, the at least one opening extending about an axis, the first region including the at least one opening, the second region being adjacent to the at least one opening, the at least one opening receiving a conductive material or a conductor in a glass material or a glass-ceramic material, wherein the conductive material has a first coefficient of expansion α 1 , the glass material or the glass-ceramic material has a second coefficient of expansion α 2 , and the housing part has a third coefficient of expansion α 3 , the third coefficient of expansion α 3 being always greater than the second coefficient of expansion α 2 , wherein:
(i) the housing part includes a flexible flange, the flexible flange having a free space F between a raised region or a lowered region of the housing part and having a connecting region; or
(ii) the first region including a width W that is substantially perpendicular to the axis of the at least one opening, the width W of the first region being always greater than a thickness D 2 and a thickness D E of the second region; or
(iii) a combination of (i) and (ii).
2 . The electrical device according to claim 1 , wherein the housing part includes the flexible flange, wherein the first region includes the width W, wherein the flexible flange is connected to the housing.
3 . The electrical device according to claim 1 , wherein the flexible flange is connected to the housing by way of welding or laser welding or soldering, in such a manner that a connection therebetween is substantially gas-tight and that a helium leakage rate of less than 10-8 mbar 1/sec is provided.
4 . The electrical device according to claim 1 , wherein the flexible flange is produced by reshaping of a sheet material part, wherein the flexible flange has a thickness D 2 of the sheet material part.
5 . The electrical device according to claim 1 , wherein the flexible flange consists of one of the following materials:
a ferritic steel with a coefficient of expansion in a range of 10 to 12·10-6 K−1;
a steel with a coefficient of expansion in a range of 12 to 13·10-6 K−1;
a Duplex steel with a coefficient of expansion in a range of 13 to 14·10-6 K−1;
an austenitic steel with a coefficient of expansion in a range of 16 to 18·10-6 K−1.
6 . The electrical device according to claim 1 , wherein:
(i) the thickness D 2 and the thickness D E are in a range of 0.1 mm to 1 mm or 0.1 mm to 0.6 mm; or
(ii) the width W is in a range of 0.6 mm to 1 mm or in a range of 0.7 mm to 0.9 mm; or
(iii) a combination of (i) and (ii).
7 . The electrical device according to claim 1 , wherein at least one of:
the third coefficient of expansion α 3 is in a range of 12·10-6 1/K to 19·10-6 1/K;
the second coefficient of expansion α 2 is in a range of 9·10-6 1/K to 11·10-6 1/K; and
the first coefficient of expansion ai is in a range of 6·10-6 1/K to 11·10-6 1/K.
8 . The electrical device according to claim 1 , wherein at least one of a metal of the housing and a metal of the conductor is iron, an iron alloy, an iron-nickel alloy, an iron-nickel-cobalt alloy, KOVAR, steel, stainless steel, aluminum, an aluminum alloy, AISiC, magnesium, a magnesium alloy, copper, a copper alloy, titanium, or a titanium alloy.
9 . The electrical device according to claim 1 , wherein the housing part in the first region in a region of the at least one opening comprises a collar, thereby forming an inside wall having a height that is greater than a material thickness or the thickness D 2 .
10 . The electrical device according to claim 9 , wherein the collar is domed or reshaped with at least one of an indentation and a protrusion.
11 . The electrical device according to claim 9 , wherein a glassing length EL of the glass material or the glass-ceramic material is determined by a height of the collar.
12 . The electrical device according to claim 9 , wherein the material thickness or the thickness D 2 of the second region is equal to a material thickness or a thickness of at least one of at least a component elected from the collar, an indentation of the collar, and a protrusion of the collar.
13 . The electrical device according to claim 1 , wherein the electrical device has a total height which is in a range of 1 mm to 40 mm.
14 . The electric device according to claim 1 , wherein a material of the flexible flange is selected such that an expulsion force of the conductor is set by glass pre-stresses which act via the glass material upon the conductor.
15 . The electrical device according to claim 14 , wherein by adjustment of the expulsion force of the conductor a safety vent function of the conductor is set.
16 . The electrical device according to claim 1 , wherein an expulsion force of the conductor and a safety vent function of the conductor is set by at least one of the following measurements:
a thickness of a glassing;
using different ones of a plurality of glass materials;
a different bubble content in a glass;
a structured glass surface based on a shape of a glass part prior to sealing;
a structured glass surface based on a shape of a glass part during sealing;
a structured glass surface through a laser treatment after sealing;
a plurality of notches or a plurality of tapers in the glass material, on one or both sides of the housing;
a plurality of notches or a plurality of tapers in at least one of the conductor, the housing, the housing part, and a base body of the housing.
17 . The electrical device according to claim 1 , wherein the electrical device is an electrical storage device or a sensor housing.
18 . The electrical device according to claim 1 , wherein the electrical device is a battery or a condensator.