Lithium cell

Patent metadata

Field	Value
Publication number	US-10355250-B2
Application number	US-201715723269-A
Country	US
Kind code	B2
Filing date	Oct 3, 2017
Priority date	Oct 10, 2016
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

A lithium cell includes a housing including a housing cup, a cover plate and an annular insulating sealing element, wherein the housing has an end-side cup base, a circumferential housing casing and a circular opening opposite the housing base and formed by an opening edge. The cover plate has a circumferential edge and closes the circular opening. The cell includes a pin-shaped negative electrode current collector electrically connected to the cover plate. The sealing element is fitted onto the edge of the cover plate. The sealing element insulates the cover plate and the housing cup from one another. The cell can be produced by the components being brought together in two preassembled units combined to form the cell.

First claim

The invention claimed is:

1. A lithium cell comprising:
a positive electrode in the form of a hollow cylinder and defining a hollow space,
a negative electrode arranged in the hollow space,
a separator arranged between the positive and negative electrodes,
a liquid electrolyte with which the electrodes and the separator are impregnated,
a housing surrounding an interior space in which the positive and negative electrodes and the separator are arranged,
a pin-shaped current collector for the negative electrode having a first, terminal section completely recessed in the negative electrode and a second section, immediately adjacent to the first, terminal section, that is not in direct contact with the negative electrode, and
an insulator element protecting the second section, at least in regions, from direct contact with the electrolyte, wherein
the housing comprises a cylindrical housing cup, a cover plate and an electrically insulating, annular sealing element,
the housing cup has an end-side cup base, a circumferential housing casing and an end-side, circular opening is situated opposite the housing base and is formed by a circular opening edge,
the cover plate is circular, has a circumferential edge and closes the circular opening,
the sealing element is fitted onto the edge of the cover plate and insulates the cover plate and the housing cup from one another, and
the pin-shaped current collector electrically connects to the cover plate.

2. The cell according to claim 1 , wherein at least one of:
the pin-shaped current collector is welded to the cover plate,
the cover plate has an aperture through which the pin-shaped current collector is guided, and
the cover plate and the pin-shaped current collector connect to one another by an annular welding line guided around the current collector.

3. The cell according to claim 1 , wherein at least one of:
the housing casing of the cylindrical housing cup has a circumferential lug formed by radial drawing-in and faces the interior space,
the edge of the cover plate is seated, together with the annular sealing element, on the lug, and
the circular opening edge of the housing cup is placed radially inward over the edge of the cover plate so that the diameter of the opening defined by the opening edge is smaller than the diameter of the cover plate.

4. The cell according to claim 1 , having at least one of:
the separator is a closed container completely surrounding the negative electrode and having only one aperture for the first current collector, and
the separator connects to the insulator element by welding or adhesive bonding.

5. The cell according to claim 1 , wherein
the function of the insulator element and the electrically insulating sealing element are an integral plastic part.

Assignees

• Varta Microbattery Gmbh

Inventors

• Gaugler Winfried

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0422

  Cells or battery with cylindrical casing · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M2/06

  Electricity · mapped topic

• H01M6/16 Primary

  with organic electrolyte (H01M6/18 takes precedence) · CPC title