Bushing forming a terminal for a lithium storage battery and related storage battery

Patent metadata

Field	Value
Publication number	US-10205152-B2
Application number	US-201314397053-A
Country	US
Kind code	B2
Filing date	Apr 23, 2013
Priority date	Apr 24, 2012
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

The present invention relates to a bushing forming a terminal for a storage battery, made through an opening connecting to either side of a wall comprising two opposing surfaces, which comprises: two electrically insulating washers, each comprising a bearing portion resting by the surface thereof under pressure against one of the surfaces of the wall and a guiding portion projecting from the bearing portion and resting under pressure against the edge of the opening; two electrically conductive parts, in which a male part is adjusted clamped inside the female part, each one of the parts comprising a bearing portion resting by the surface thereof under pressure against a bearing portion of the washers, the female part resting by the surface thereof under pressure against the guiding portions of the washers. The material(s) of the parts is/are fitted, and the section(s) thereof is/are sized so as to enable the flow of an electric current with a value of no less than 100 A.

First claim

The invention claimed is:

1. A bushing forming a terminal for a lithium-ion (Li-ion) storage battery, formed through an orifice opening on either side of a wall having two opposite faces, comprising:
two electrically insulating washers, each having a bearing portion bearing with its surface under pressure against one of the faces of the wall, and a guiding portion projecting from the bearing portion, the guiding portion bearing with pressure against the edge of the orifice of the wall,
two electrically conductive pieces, of which a male piece is fitted tightly in the female piece, each of the conductive pieces having a bearing portion bearing with its surface under pressure against a bearing portion of the washers, the female piece furthermore bearing with its surface under pressure against the guiding portions of the washers, wherein radial tightening of the male and female pieces between one another and of the two insulating washers between the female piece and the edge of the orifice ensures leaktightness, wherein the female piece is open and is welded by a continuous weld bead to the male piece on the emergent end of the latter,

in which bushing the material(s) of the pieces is (are) adapted, and their cross sections are dimensioned, in order to allow an electric current with a value at least equal to 100 A to flow through.

2. The bushing as claimed in claim 1 , wherein the material(s) of the pieces is (are) adapted, and their cross sections are dimensioned, in order to allow an electric current with a value at most equal to 500 A to flow through.

3. The bushing as claimed in claim 1 , wherein the male and female pieces are made of the same material.

4. The bushing as claimed in claim 3 , wherein the male and female pieces are made of electrolytic copper, copper alloyed with aluminum (CuA1), or copper alloyed with tellurium (CuTe).

5. The bushing as claimed in claim 1 , wherein the insulating washers are made of polyetherimide (PEI).

6. The bushing as claimed in claim 1 , wherein the contact cross section S 1 between the male piece and the female piece is greater than 8 mm 2 .

7. The bushing as claimed in claim 1 , wherein the smallest cross section S 2 of the male piece is greater than 8 mm 2 .

8. A lithium-ion (Li-ion) battery or storage battery comprising a housing with a cover through which a bushing as claimed claim 1 is formed.

9. The Li-ion battery or storage battery as claimed in claim 8 , wherein the male piece is of the internally threaded type and projects outside the housing.

10. The Li-ion battery or storage battery as claimed in claim 8 , wherein the cover comprises aluminum.

11. The Li-ion battery or storage battery as claimed in claim 8 , wherein:
the material of the negative electrode(s) is selected from the group comprising graphite, lithium, titanate oxide Li 4 TiO 5 O 12 ;
the material of the positive electrode(s) is selected from the group comprising LiFePO 4 , LiCoO 2 , LiNi 0.33 Mn 0.33 Co 0.33 O 2 .

12. A method for producing a bushing as claimed in claim 1 , according to which the following steps are carried out:
a/ insertion through the orifice, from each of the two opposite faces of the wall, of one of the guiding portions of the washers, in such a way that they bear against the edge of the orifice of the wall,
b/ insertion, from one face of the wall, of the female piece which is open into one of the washers;
c/ force-fitting, from the opposite face of the wall, of the male piece, in such a way that each of the bearing portions of the male and female pieces bears with its surface under pressure against a bearing portion of the washers, which itself bears with pressure against the edge of the orifice, the female piece furthermore bearing with pressure against the guiding portions of the washers, which themselves bear with their surface under pressure against the edge of the orifice of the wall, wherein radial tightening of the male and female pieces between one another and of the two insulating washers between the female piece and the edge of the orifice ensures leaktightness; and
d/ welding, by a continuous weld bead, the female piece to the male piece on the emergent end of the latter.

13. The method as claimed in claim 12 , wherein the force-fitting according to step c/ is carried out by pressing with a force greater than or equal to 1 metric ton-force.

14. The bushing as claimed in claim 6 , wherein the contact cross section S 1 between the male piece and the female piece is greater than 10 mm 2 .

15. The bushing as claimed in claim 7 , wherein the smallest cross section S 2 of the male piece is greater than 10 mm 2 .

16. The Li-ion battery or storage battery as claimed in claim 10 wherein the cover comprises aluminum 1050 or aluminum 3003 .

Assignees

• Commissariat Energie Atomique

Inventors

• Dewulf Frederic
• Jost Pierre

Classifications

• H01M4/502 Primary

  for non-aqueous cells (H01M4/505 takes precedence) · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• Y10T29/49108

  Electric battery cell making · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M10/0525 Primary

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