Feedthrough forming a terminal for an electrochemical metal-ion battery and associated battery

Patent metadata

Field	Value
Publication number	US-11005086-B2
Application number	US-201716329840-A
Country	US
Kind code	B2
Filing date	Sep 1, 2017
Priority date	Sep 7, 2016
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

A feedthrough that forms a terminal for a metal-ion electrochemical accumulator, provided through an aperture opening out on either side of a wall including two opposite faces. The includes feedthrough an electrically conductive male part, and a female part made of an aluminum-based alloy. A portion of the male part is tight-fitted into a blind hole of the female part.

First claim

The invention claimed is:

1. A feedthrough forming a terminal for a metal-ion electrochemical accumulator, provided through an aperture opening out on either side of a wall including two opposite faces, including:
an electrically conductive male part; and
a female part made of an aluminum-based alloy, a portion of the male part being tight-fitted into a blind hole of the female part,

wherein the male part is made of an aluminum-based alloy that is different from that of the female part.

2. The feedthrough as claimed in claim 1 , including:
two electrically insulating washers, each including a bearing portion superficially bearing against one of the faces of the wall and a guide portion protruding with respect to the bearing portion and making contact with the edge of the aperture,
in which feedthrough each of the conductive male and female parts includes a bearing portion superficially bearing against a bearing portion of the washers.

3. A method for producing a feedthrough as claimed in claim 2 , wherein the following steps are carried out:
a/ inserting, through the aperture, from each of the two opposite faces of the wall, one of the guide portions of the washers such that they bear against the edge of the aperture in the wall;
b/ inserting, from one face of the wall, the aluminum female part into one of the washers;
c/ press-fitting, from the opposite face of the wall, the male part such that the portion of the male part abuts against the bottom of the blind hole of the female part and such that each of the bearing portions of the male and female parts superficially bears against a bearing portion of the washers that is itself guided against the edge of the aperture.

4. The method as claimed in claim 3 , the press-fitting operation in step c/ being carried out by pressing with a force that is greater than or equal to 1 tonne-force so as to obtain a type N9p7 fitting between portion of male part and blind hole of female part.

5. The feedthrough as claimed in claim 1 , the aluminum alloy of the male part being chosen from grade 5754, 6060 and 3003 alloys with an H18 temper, the aluminum alloy of the female part being a grade 1050 alloy.

6. The feedthrough as claimed in claim 1 , the tight fitting of the portion of the male part in the blind hole of the female part is a type N9p7 fitting.

7. The feedthrough as claimed in claim 1 , the one or more materials of the parts and the dimensions of the cross sections of the parts being suitable for allowing an electric current up to a value that is equal at least to 100 A to pass.

8. The feedthrough as claimed in claim 1 , the portion of the male part comprising at least one duct opening out both on the outside of the accumulator and on the bottom into the blind hole of the female part, in such a way as to let air out when crumping the male part into the female part.

9. The feedthrough as claimed in claim 1 , the thickness of the female part measured between the bottom of the blind hole and the base of the female part being greater than or equal to 2 mm for a bore diameter of the blind hole of the order of 6 mm.

10. A metal-ion accumulator or battery including a housing with a cover through which a feedthrough as claimed in claim 1 is produced.

11. The metal-ion accumulator or battery as claimed in claim 10 , the male part being an internally threaded part and protruding toward the outside of the housing.

12. The metal-ion accumulator or battery as claimed in claim 11 , the cover being made of aluminum.

13. The metal-ion accumulator or battery as claimed in claim 11 , the female part of the feedthrough being welded to an aluminium-based current collector which is itself welded to an aluminium-based electrode foil bearing an active metal-ion insertion material.

14. The metal-ion accumulator or battery as claimed in claim 13 , the active metal-ion insertion material chosen from a material based on titanate.

Assignees

• Commissariat Energie Atomique

Inventors

• Dewulf Frédéric
• Jost Pierre
• Leys Côme-Emmanuel

Classifications

• H01G11/66 Primary

  Current collectors · CPC title

• H01M50/566

  by welding, soldering or brazing · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title

• H01M50/55

  on the same side of the cell · CPC title

• H01M50/559

  Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells (H01M50/553 takes precedence) · CPC title