Secondary lithium battery and manufacturing method

Patent metadata

Field	Value
Publication number	US-2021111397-A1
Application number	US-202017064743-A
Country	US
Kind code	A1
Filing date	Oct 7, 2020
Priority date	Oct 10, 2019
Publication date	Apr 15, 2021
Grant date	—

Abstract

A secondary lithium battery includes (a) a housing enclosing an interior space, and (b) a composite body arranged in the interior space and including at least one positive electrode, at least one negative electrode and at least one separator, wherein (c) the housing includes a metal housing part having an inner side pointing into the interior space and an outer side pointing away from the interior space, and (d) the metal housing part includes: a first layer consisting of aluminium or an aluminium alloy that forms the inner side of the metal housing part, and in direct contact with the first layer, a second layer consisting of nickel or a nickel alloy that forms the outer side of the metal housing part.

First claim

1 . A secondary lithium battery comprising:
(a) a housing enclosing an interior space, and (b) a composite body arranged in the interior space and comprising at least one positive electrode, at least one negative electrode and at least one separator, wherein (c) the housing comprises a metal housing part having an inner side pointing into the interior space and an outer side pointing away from the interior space, and (d) the metal housing part comprises:
a first layer consisting of aluminium or an aluminium alloy that forms the inner side of the metal housing part, and
in direct contact with the first layer, a second layer consisting of nickel or a nickel alloy that forms the outer side of the metal housing part.

2 . The lithium battery according to claim 1 , wherein
the first layer consists of the aluminium or the aluminium alloy having a thickness of 10 μm to 1500 μm, and the second layer consists of the nickel or the nickel alloy having a thickness of 0.1 μm to 100 μm.

3 . The battery according to claim, wherein
the composite body comprises the electrodes in stacked form or in wound form, the electrodes are able to reversibly store and release lithium ions, the electrodes each comprise a current collector partly covered with an active material, and the positive electrode is electrically connected to the metal housing part.

4 . The battery according to claim 1 , wherein
the housing comprises the metal housing part as first housing part and a further metal housing part as second housing part, the first and the second housing part are both in a cup shape and each have a circular or oval base and an annular side wall, the first and the second housing part are electrically isolated from one another by an annular seal having electrically insulating properties, and the first housing part is electrically connected to the positive electrode and the second housing part is electrically connected to the negative electrode.

5 . The battery according to claim 1 , wherein
the housing comprises the metal housing part as first housing part and a further metal housing part as second housing part, the first housing part has a cup-shaped design and a circular base and an annular side wall, whereas the second housing part is a circular disc, the first and the second housing part are electrically isolated from one another by an annular seal having electrically insulating properties, and the first housing part is electrically connected to the positive electrode and the second housing part is electrically connected to the negative electrode.

6 . The battery according to claim 1 , wherein
the housing comprises the metal housing part as a first housing part and a further metal housing part as second housing part, the first housing part has a cup-shaped design and a circular base and an annular side wall, whereas the second housing part is a circular disc, the first and the second housing part are electrically isolated from one another by an annular seal having electrically insulating properties, and the first housing part is electrically connected to the negative electrode and the second housing part is electrically connected to the positive electrode.

7 . The battery according to claim 1 , wherein
the housing comprises the metal housing part as first housing part and a further non-metal housing part as second housing part, the metal housing part is designed as a prismatic container that has a polygonal base with n sides and n rectangular side walls that enclose a right angle with the base, wherein n is an integer from 4 to 8, and the second housing part serves as cover for the first housing part and closes off an opening defined by the n rectangular side walls.

8 . The battery according to claim 1 , wherein:
the housing comprises the metal housing part as first housing part and a further metal housing part as second housing part, the metal housing part is a prismatic container having a polygonal base with n sides and n rectangular side walls that enclose a right angle with the base, wherein n is an integer from 4 to 8, and the second housing part serves as cover for the first housing part and closes off an opening defined by the n rectangular side walls.

9 . The battery according to claim 1 , wherein at least one of:
the first layer comprises lithium in addition to the aluminium or the aluminium alloy, the first layer is coated with a layer consisting of lithium, the first layer is lithium-doped, and the aluminium in the first layer is alloyed with lithium.

10 . A method of manufacturing the battery according to claim 1 , comprising:
providing a foil or a metal sheet consisting of aluminium or of an aluminium alloy, applying a layer consisting of nickel or of a nickel alloy to one side of the foil or of the metal sheet, shaping the foil or metal sheet resulting from step (b) using a deep-drawing tool to form a metal housing part the inner side of which is formed by the foil or the metal sheet consisting of the aluminium or of the aluminium alloy and the outer side of which is formed by the layer consisting of the nickel or of the nickel alloy, and assembling the lithium battery using the housing part formed in step (c).

11 . The method according to claim 10 , further comprising:
applying the layer consisting of the nickel or of the nickel alloy to the foil or the metal sheet consisting of the aluminium or the aluminium alloy through a CVD or a PVD method.

12 . The method according to claim 10 , further comprising:
roll-coating a foil consisting of nickel or of the nickel alloy onto the foil or onto the metal sheet consisting of the aluminium or the aluminium alloy to form the layer consisting of the nickel or of the nickel alloy.

Assignees

• Varta Microbattery Gmbh

Inventors

• Fischer Claus-Christian
• Kilibarda Goran
• Kreidler Bernd
• Schebesta Sebastian

Classifications

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M50/20

  Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders (structural combination of accumulators with charging apparatus H01M10/46) · CPC title

• H01M2004/028

  Positive electrodes · CPC title