Energy storage assembly comprising an electrically insulating elastic ring

Patent metadata

Field	Value
Publication number	US-9911538-B2
Application number	US-201314386336-A
Country	US
Kind code	B2
Filing date	Mar 21, 2013
Priority date	Mar 21, 2012
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

The invention concerns an electrical energy storage assembly (capacitor or battery) comprising: -an envelope ( 20 ) including: *at least one lateral wall ( 21 ), and *an open end, -an electrochemical element ( 30 ) intended to be contained in the envelope ( 20 ) and -at least one cover ( 40 ) intended to be positioned at the open end of the envelope ( 20 ), each cover ( 40 ) including: *a cover wall ( 41, 45 ) intended to cover the open end of the envelope ( 20 ), *a lateral face ( 42, 43 ) at the periphery of the cover wall ( 41, 45 ) and intended to be facing the lateral wall ( 21 ) of the envelope ( 20 ), -at least one electrically insulating elastic annular ring ( 50 ) intended to be positioned between the lateral wall ( 21 ) of the envelope ( 20 ) and the lateral wall ( 42, 43 ) of the cover ( 40 ).

First claim

The invention claimed is:

1. An electrical energy storage assembly including:
a case including:
at least one side wall, and
at least one open end,

an electrochemical element contained in the case and
at least one cover positioned at a corresponding one of the at least one of the open ends of the case, each cover including:
a covering wall covering a corresponding one of the at least one open end of the case,
a side wall on the perimeter of the covering wall facing a corresponding one of the at least one side walls of the case,
an elastic electrically insulating annular ring positioned between the at least one side wall of the case and the side wall of the at least one cover, wherein the electrical energy storage assembly further includes a degassing channel disposed between at least one of a) the ring and the case, and b) the ring and the at least one cover, to allow the passage of gas between the interior and the outside of the storage assembly, wherein the side walls of the at least one cover and of the case between which the ring is positioned, are parallel over the entire area where they are in contact with the ring, and wherein the case or the at least one cover has, on one face of its side wall facing the ring and which is parallel to the side wall of the cover, respectively parallel to the side wall of the case, at least one recess extending at least partially along the longitudinal dimension of the side wall, each recess forming said degassing channel.

2. The storage assembly according to claim 1 , wherein the material constituting the ring is an elastomer.

3. The storage assembly according to claim 2 , wherein the material constituting the ring is ethylene-propylene-diene monomer.

4. The storage assembly according to claim 1 , wherein the material constituting the ring is a foam.

5. The storage assembly according to claim 1 , wherein the ring is split over its entire height.

6. The storage assembly according to claim 1 wherein the ring takes the form of a tube, said ring including at least one recess extending over the entire longitudinal dimension of the ring over at least one of its faces, each recess forming a degassing channel with the side wall of at least one of the at least one cover and the case.

7. The storage assembly according to claim 1 , wherein the ring takes the form of a tube, said ring including at least one pin extending radially on at least one of its faces, each pin defining at least partially a degassing channel with the side wall of at least one of the at least one cover and the case.

8. The storage assembly according to claim 1 , wherein the side wall of at least one of the at least one cover and the case includes at least one pin extending radially on the face intended to face the ring, each pin defining at least partially a degassing channel with the face of the ring facing said side face.

9. The storage assembly according to claim 1 , wherein the side wall of the at least one cover and the case includes a gap to accommodate the ring.

10. The storage assembly according to claim 1 , wherein at least one of the case and the at least one cover has a positioning groove facing the ring.

11. The storage assembly according to claim 1 , wherein the ring has a pointed cross-section over at least one of its faces so that the contact of the ring with at least one of the at least one cover and the case is a line type contact.

12. The storage assembly according to claim 1 , wherein the ring has at least one tab extending in the longitudinal direction of the ring and locally extending the same in that direction.

13. The storage assembly according to claim 1 , wherein the side walls of the at least one cover and of the case between which the ring is positioned, are parallel over the entire area where they are in contact with the ring.

14. The storage assembly according to claim 1 , also including a glue positioned between the side walls of the cover and of the at least one case so that the ring is positioned on the path that the glue must take to come into contact with the electrochemical element located in the interior of the case.

15. A process for assembling an electrical energy storage assembly including a case including at least one side wall and at least one open end, an electrochemical element, and at least one cover including a covering wall and a side wall at the perimeter of the covering wall, the process comprising:
positioning the electrochemical element within the case,
positioning the at least one cover on the open face of the case,
positioning an annular elastic electrically insulating ring between the at least one cover and the case, wherein said process further includes positioning a degassing channel between at least one of a) the ring and the case and b) the ring and the at least one cover to allow the passage of gas between the interior and the outside of the storage assembly, wherein the side walls of the at least one cover and of the case between which the ring is positioned, are parallel over the entire area where they are in contact with the ring, the case or the at least one cover having, on one face of its side wall facing the ring and which is parallel to the side wall of the cover, respectively parallel to the side wall of the case, at least one recess extending at least partially along the longitudinal dimension of the side wall, each recess forming said degassing channel.

16. The process according to claim 15 wherein, once the at least one cover, the case and the annular ring are positioned, the process further includes:
placing a glue between the side walls of the case and the at least one cover and
heating the glue so that said glue polymerises.

17. The process according to claim 15 , wherein said positioning the annular ring is carried out following said positioning the at least one cover on the at least one open end of the case, said process further comprising positioning the annular ring by forcible insertion between the side walls of the at least one cover and the case.

Assignees

• Blue Solutions

Inventors

• Jourdren Arnaud
• Baylard Eric

Classifications

• H01G11/58

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• Y10T29/49108

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• H01G11/80

  Gaskets; Sealings · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01G11/82

  Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations · CPC title