Battery and process for producing a battery

Patent metadata

Field	Value
Publication number	US-11258145-B2
Application number	US-202016850008-A
Country	US
Kind code	B2
Filing date	Apr 16, 2020
Priority date	May 20, 2019
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

A method for producing a battery includes depositing, via sputter deposition, a coating on at least a portion of a cup shaped first housing part of the battery. The coating includes aluminium, chromium, tin, and/or an alloy having two or more of the group consisting of aluminium, chromium, and tin. The method also includes establishing an electrical connection between a current conductor of the battery and the cup-shaped first housing part of the battery and assembling the cup-shaped first housing part of the battery and a second housing part of the battery to form a housing of the battery. The housing has an interior space that includes a composite body including a positive electrode, a negative electrode, a separator, and the current conductor. The cup-shaped first housing part has a circular or oval bottom and a ring-shaped side wall.

First claim

What is claimed is:

1. A battery, comprising:
a metallic housing enclosing an interior space, the housing including a cup-shaped first housing part and a second housing part; and
a composite body arranged in the interior space, the composite body including a positive electrode, a negative electrode, a separator, and a current conductor that electrically connects the cup-shaped first housing part either to the positive electrode or to the negative electrode,
wherein the cup-shaped first housing part has a circular or oval bottom and a ring-shaped side wall,
wherein the bottom of the cup-shaped first housing part and the side wall of the cup-shaped first housing part each have an inside facing the interior space of the housing and an outside facing in a direction opposite the interior space of the housing, and
wherein at least a portion of the inside of the bottom of the cup-shaped first housing part and/or at least a portion of the inside of the side-wall of the cup-shaped first housing part include a sputter-deposited coating, the sputter-deposited coating including aluminium, chromium, tin, and/or an alloy having two or more of the group consisting of aluminium, chromium, and tin.

2. The battery according to claim 1 , wherein the composite body includes the electrodes in stacked form or in rolled form, and
wherein the electrodes are configured so as to be able to reversibly incorporate and release lithium ions.

3. The battery according to claim 1 , wherein electrodes each comprise a current collector which is partly covered with a respective active material, and
wherein the current conductor is a part of one of the current collectors is not covered with the respective active material.

4. The battery according to claim 1 , wherein the cup-shaped first housing part includes steel or stainless steel, and
wherein the outside of the cup-shaped first housing part is covered with a layer of nickel.

5. The battery according to claim 1 , wherein the current conductor includes aluminium or an aluminium alloy,
wherein the coating is based on a same metal as the current conductor, and
wherein the battery includes a second current conductor including copper or a copper alloy.

6. The battery according to claim 1 , wherein second housing part has a cup-shaped configuration, and
wherein the battery is a button cell and the metallic housing is a metallic button cell housing.

7. The battery according to claim 6 wherein the battery is a rechargeable lithium ion battery, the battery further comprising:
a non-aqueous electrolyte comprising a lithium electrolyte salt.

8. The battery according to claim 6 , wherein the current conductor electrically connects the cup-shaped first housing part to the positive electrode or the negative electrode via a weld, the weld being formed in a region of the portion of the inside of the bottom of the cup-shaped first housing part that includes the sputter-deposited coating.

9. The battery according to claim 6 , wherein the sputter-deposited coating is disposed over an entirety of the inside of the bottom of the cup-shaped first housing part and over at least a portion of the inside of the side wall of the cup-shaped first housing part.

10. The battery according to claim 6 , wherein the bottom of the cup-shaped first housing part includes an intended rupture region.

11. The battery according to claim 10 , wherein the sputter deposited coating has a non-uniform thickness, the non-uniform thickness being in a range of 10 nm to 10 μm.

12. The battery according to claim 11 , wherein the sputter deposited coating has a first thickness in the intended rupture region and a second thickness outside of the intended rupture region, wherein a maximum thickness of the first thickness is less than a minimum thickness of the second thickness.

13. The battery according to claim 6 , wherein the sputter deposited coating has a uniform layer thickness, the layer thickness being in a range of 10 nm to 10 μm.

Assignees

• Varta Microbattery Gmbh

Inventors

• Kilibarda Goran
• Kreidler Bernd
• Rieger Joachim

Classifications

• H01M50/119

  Metals · CPC title

• Y02P70/50

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

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M50/1243

  characterised by the internal coating on the casing · CPC title

• C23C14/34

  Sputtering · CPC title