Cylindrical cell with contact lugs
地域：
Ellwangen Jagst
摘要
A cylindrical cell includes a. a cylindrical housing enclosing an interior space and composed of a first and a second metal housing part, wherein the housing includes, at its axial ends, a first planar end face and a second planar end face connected to one another by an annular casing, b. a positive electrode and a negative electrode, at least one of which can intercalate and/or deintercalate lithium ions, wherein the positive electrode electrically connects to the first housing part directly or via a separate electrical conductor, and the negative electrode electrically connects to the second housing part directly or via a separate electrical conductor, c. a first contact lug configured as a sheet-metal part that is welded onto the first end face and which has a planar section extending in a plane parallel to the first end face, and d. a second contact lug configured as a sheet-metal part that is welded onto the second end face and has a planar subsection extending in a plane parallel to the second end face and has a subsection angled away from the plane and extends as far as into the plane of the planar section, wherein the angled-away subsection includes an expansion section in which the second contact lug expands in the main direction of extent in a targeted and predictable manner under a defined tensile loading in its main direction of extent.
說明書
This disclosure relates to a cylindrical cell with contact lugs.
Contact lugs are required to fix cells in electronic devices, for example, onto printed circuit boards, in particular by soldering or welding. The contact lugs first serve as mechanical fastening means, but also as electrical conductors. For this purpose, the cells generally have one contact lug connected to their positive pole and one contact lug connected to their negative pole. Cells with contact lugs of this kind are known, for example, from US 2011/001618 A1.
The cells are often button cells, as presented in US 2011/001618 A1. By definition, button cells are cells with a round, usually cylindrical cross section, the height of which is smaller than its diameter. Button cells are generally axially delimited by two planar, usually round, end faces. For reasons of production, the contact lugs are usually also fitted in these regions. The contact lugs are usually flat sheet-metal strips applied, for example, by resistance welding to the end faces. By bending over one of the contact lugs through 90°, the contact lug can be guided onto the side of the opposite end face. When the contact lugs are located in the same plane, fixing the contact lugs onto a printed circuit board is particularly simple.
In recent years, button cells based on lithium-ion technology have increasingly also been developed, for example, in WO 2010/089152 A1. Button cells of that kind require more safety solutions since, on account of their high energy density and also their easily combustible constituent parts, they can present a great danger to consumers in the event of damage.
權(quán)利要求
What is claimed is:1. A cylindrical cell comprising:a. a cylindrical housing enclosing an interior space and composed of a first and a second metal housing part, wherein the housing comprises, at its axial ends, a first planar end face and a second planar end face connected to one another by an annular casing, b. a positive electrode and a negative electrode, at least one of which can intercalate and/or deintercalate lithium ions, wherein the positive electrode electrically connects to the first housing part directly or via a separate electrical conductor, and the negative electrode electrically connects to the second housing part directly or via a separate electrical conductor, c. a first contact lug configured as a sheet-metal part that is welded onto the first end face and which has a planar section extending in a plane parallel to the first end face, and d. a second contact lug configured as a sheet-metal part that is welded onto the second end face and has a planar subsection extending in a plane parallel to the second end face and has a subsection angled away from the plane and extends as far as into the plane of the planar section, wherein the angled-away subsection comprises an expansion section in which the second contact lug expands in the main direction of extent in a targeted and predictable manner under a defined tensile loading in its main direction of extent, wherein a length of the second contact lug in the expansion section and/or length of the at least one track or strip conductor or conductor with a round cross section exceeds the height of the cell at least by a factor of 1.1. 2. The cell according to claim 1 , wherein the angled-away subsection comprises a terminal contact section and the expansion section between the contact section and the plane of the planar subsection. 3. The cell according to claim 1 , wherein at least one of:the second contact lug is a track or strip conductor or conductor with a round cross section in the expansion section or comprises at least one conductor in the expansion section, the second contact lug has, in a main direction of extent, a cross section tapered in relation to the terminal contact section of the angled-away subsection and/or the planar subsection in the expansion section, and the second contact lug or the at least one track or strip conductor or conductor with a round cross section has a non-linear, or bent profile in the expansion section. 4. The cell according to claim 1 , wherein at least one of:the contact lug comprises at least one bent or bent-away lower section in the expansion section, the contact lug is of S-, U- or Z-shaped design in the expansion section or comprises a lower section designed in this way within the expansion section, and the contact lug is a wave design in the expansion section or comprises a lower section designed in this way within the expansion section. 5. The cell according to claim 1 , wherein at least one of:the expansion section comprises two conductor tracks or two strip conductors or two conductors with a round cross section, the two conductor tracks or the two strip conductors or the two conductors with a round cross section each have a bent profile in the expansion section, the two conductor tracks or the two strip conductors or the two conductors with a round cross section are bent in opposite bending directions in the expansion section, and the second contact lug is an O-shape in the expansion section or comprises a lower section designed in this way within the expansion section. 6. The cell according to claim 1 , wherein at least one of:the first contact lug comprises a contact section that can be angled away or is angled away from the plane of the section, and the contact section of the first contact lug points in the same direction as the contact section of the second contact lug. 7. The cell according to claim 1 , wherein at least one of:the cell has a diameter of 5 mm to 25 mm, the cell has a height of 3 mm to 50 mm, and the cell is a button cell. 8. The cell according to claim 1 , wherein at least one of:the contact lugs and consist of sheet metal with a thickness of 0.25 mm to 2.5 mm, and the contact lugs and are manufactured as stamped parts. 9. The cell according to claim 1 , wherein at least one of:the cell has a rupture cross, and the rupture cross is made in the first end face or in the second end face. 10. The cell according to claim 1 , wherein at least one of:the housing consists of two housing parts that can be displaced axially in relation to one another, and the housing has, in the casing, a hole that can vent the interior space. 11. The cell according to claim 1 , wherein the cell is fixed on a printed circuit board via the contact sections. 12. A cylindrical cell comprising:a. a cylindrical housing enclosing an interior space and composed of a first and a second metal housing part, wherein the housing comprises, at its axial ends, a first planar end face and a second planar end face connected to one another by an annular casing, b. a positive electrode and a negative electrode, at least one of which can intercalate and/or deintercalate lithium ions, wherein the positive electrode electrically connects to the first housing part directly or via a separate electrical conductor, and the negative electrode electrically connects to the second housing part directly or via a separate electrical conductor, c. a first contact lug configured as a sheet-metal part that is welded onto the first end face and which has a planar section extending in a plane parallel to the first end face, and d. a second contact lug configured as a sheet-metal part that is welded onto the second end face and has a planar subsection extending in a plane parallel to the second end face and has a subsection angled away from the plane and extends as far as into the plane of the planar section, wherein the angled-away subsection comprises an expansion section in which the second contact lug expands in the main direction of extent in a targeted and predictable manner under a defined tensile loading in its main direction of extent, wherein the contact lug is of S-, U- or Z-shaped design in the expansion section or comprises a lower section designed in this way within the expansion section.
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