Battery cell comprising a covering plate fixed in a form-fitting manner in a housing

Patent metadata

Field	Value
Publication number	US-10135039-B2
Application number	US-201314430980-A
Country	US
Kind code	B2
Filing date	Aug 2, 2013
Priority date	Sep 26, 2012
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

The invention relates to a battery cell ( 1 ), in particular a lithium ion battery cell, in which a wrapping element, two current collectors and an electrolyte are accommodated in a housing ( 11 ). The prismatically formed housing ( 11 ) comprises a container that is open towards the upper side and a cover arrangement having a cover plate ( 23 ) closing the opening ( 14 ) of said container. The cover plate ( 23 ) and a wall of the container ( 13 ) are designed in the region of the opening ( 14 ) in such a manner that the wall prevents a movement of the cover plate ( 23 ) from the opening by means of a positive connection. An elastically compressible sealing element ( 31 ) is provided between the wall and a wall surface of an outer edge ( 27 ) of the cover plate directed towards said wall, in order to seal the cover plate ( 23 ) hermetically against the container ( 13 ). On the basis of the positive connection between the cover plate ( 23 ) and the edge of the container ( 13 ) a sealing effect can hereby likewise increase while the inner pressure in the housing ( 11 ) increases. The invention relates to a battery cell ( 1 ), in which it can be prevented that the cover plate ( 23 ) must be welded to the container ( 13 ).

First claim

The invention claimed is:

1. A battery cell ( 1 ), comprising:
a coil element ( 3 ) comprising a wound stack ( 5 ) comprising a first film, coated with anode material, a second film, coated with cathode material, and two plastic films acting as diaphragms,
an electrolyte,
two current collectors ( 7 , 9 ), of which one is electrically conductively connected to the first film and one is electrically conductively connected to the second film,
a prismatic housing ( 11 ) having a container ( 13 ) and a cover arrangement ( 15 );
wherein the container ( 13 ) has an opening ( 14 ), through which the coil element ( 3 ) and the two current collectors ( 7 , 9 ) can be introduced into an interior of the housing ( 11 ) during the manufacture of the battery cell ( 1 ),
wherein the cover arrangement ( 15 ) has a covering plate ( 23 ) arranged in the opening ( 14 ) of the container ( 13 ) such that the covering plate ( 23 ) and the container ( 13 ) are directly contacting each other via a press fit and such that the covering plate ( 23 ) closes off the opening ( 14 ) of the container ( 13 ) in a gas-tight and pressure-tight manner,
wherein the covering plate ( 23 ) and a wall of the container ( 13 ) in a region of the opening ( 14 ) are formed in such a way that the wall, by means of a form-fitting connection, prevents a movement of the covering plate ( 23 ) out of the opening ( 14 ), and
wherein an elastically compressible sealing element ( 31 ) is arranged between a peripheral surface of the covering plate ( 23 ), which peripheral surface is directed towards the wall, and the wall;
wherein an outer rim ( 27 ) of the covering plate ( 23 ) is bent back inwards, wherein the container ( 13 ) includes side walls ( 35 ) which surround the opening ( 14 ), wherein the side walls ( 35 ) are bent inwards in the region of the opening ( 14 ) such that the side walls ( 35 ) overlap the outer rim ( 27 ) of the covering plate ( 23 ), and wherein the elastically compressible sealing element ( 31 ) is arranged between the outer rim ( 27 ) and the side walls ( 35 ) of the container ( 13 ).

2. The battery cell as claimed in claim 1 , wherein the covering plate ( 23 ) is not cohesively connected to the container ( 13 ).

3. The battery cell as claimed in claim 1 , wherein the covering plate ( 23 ) and the wall of the container ( 13 ) in the region of the opening ( 14 ) are formed in such a way that an increase in pressure is exerted on the compressible sealing element ( 31 ) owing to increasing internal pressure in the housing ( 11 ).

4. The battery cell as claimed in claim 1 , wherein the wall of the container ( 13 ) in the region of the opening ( 14 ) is formed in such a way that the opening ( 14 ) tapers in cross section away from the interior.

5. The battery cell as claimed in claim 1 , wherein side walls ( 35 ) of the container ( 13 ) which surround the opening ( 14 ) are bent inwards in the region of the opening ( 14 ).

6. The battery cell as claimed in claim 1 , wherein an outer rim ( 27 ) of the covering plate ( 23 ) is bent back inwards and a sprayed-on sealing film ( 29 ) as a sealing element ( 31 ) is arranged between a peripheral surface of the outer rim ( 27 ), which peripheral surface is directed towards the wall, and the wall.

7. The battery cell as claimed in claim 1 , wherein the covering plate ( 23 ) is flat and a sealing lip ( 39 ) is injection-molded onto an outer rim ( 27 ) of the covering plate ( 23 ).

8. The battery cell as claimed in claim 1 , wherein the covering plate ( 23 ) is flat and a sealing ring is mounted on an outer rim ( 27 ) of the covering plate ( 23 ).

9. The battery cell as claimed in claim 1 , wherein the sealing element ( 31 ) comprises a material which is chemically resistant to the electrolyte.

10. A motor vehicle ( 100 ) having a battery cell ( 1 ) as claimed in claim 1 .

11. The motor vehicle as claimed in claim 10 , wherein the covering plate ( 23 ) is not cohesively connected to the container ( 13 ).

12. The motor vehicle as claimed in claim 10 , wherein the covering plate ( 23 ) and the wall of the container ( 13 ) in the region of the opening ( 14 ) are formed in such a way that an increase in pressure is exerted on the compressible sealing element ( 31 ) owing to increasing internal pressure in the housing ( 11 ).

13. The motor vehicle as claimed in claim 10 , wherein the wall of the container ( 13 ) in the region of the opening ( 14 ) is formed in such a way that the opening ( 14 ) tapers in cross section away from the interior.

14. The motor vehicle as claimed in claim 10 , wherein side walls ( 35 ) of the container ( 13 ) which surround the opening ( 14 ) are bent inwards in the region of the opening ( 14 ).

15. The motor vehicle as claimed in claim 10 , wherein an outer rim ( 27 ) of the covering plate ( 23 ) is bent back inwards and a sprayed-on sealing film ( 29 ) as a sealing element ( 31 ) is arranged between a peripheral surface of the outer rim ( 27 ), which peripheral surface is directed towards the wall, and the wall.

16. The motor vehicle as claimed in claim 10 , wherein the covering plate ( 23 ) is flat and a sealing lip ( 39 ) is injection-molded onto an outer rim ( 27 ) of the covering plate ( 23 ).

17. The motor vehicle as claimed in claim 10 , wherein the covering plate ( 23 ) is flat and a sealing ring is mounted on an outer rim ( 27 ) of the covering plate ( 23 ).

18. The battery cell as claimed in claim 9 , wherein, when viewed in a cross-sectional plane extending through a central axis of the container, an outer surface of the outer rim ( 27 ) extends linearly and an inner surface of the side walls ( 35 ) extends linearly and parallel to the outer surface of the outer rim.

19. A battery cell ( 1 ), comprising:
a coil element ( 3 ) comprising a wound stack ( 5 ) comprising a first film, coated with anode material, a second film, coated with cathode material, and two plastic films acting as diaphragms,
an electrolyte,
two current collectors ( 7 , 9 ), of which one is electrically conductively connected to the first film and one is electrically conductively connected to the second film,
a prismatic housing ( 11 ) having a container ( 13 ) and a cover arrangement ( 15 );
wherein the container ( 13 ) has an opening ( 14 ), through which the coil element ( 3 ) and the two current collectors ( 7 , 9 ) can be introduced into an interior of the housin 4 g ( 11 ) during the manufacture of the battery cell ( 1 ),
wherein the cover arrangement ( 15 ) has a covering plate ( 23 ) that is arranged in the opening ( 14 ) of the container ( 13 ) and that closes off the opening ( 14 ) of the container ( 13 ) in a gas-tight and pressure-tight manner, 19
wherein an outer rim ( 27 ) of the covering plate ( 23 ) is bent back inwards,
wherein the container ( 13 ) includes side walls ( 35 ) that surround the opening ( 14 ) and that are bent inwards in the region of the opening ( 14 ) such that the side walls ( 35 ) overlap the outer rim ( 27 ) of the covering plate ( 23 ),
wherein, when viewed in a cross-sectional plane extending through a central axis of the container ( 13 ), an outer surface of the outer rim ( 27 ) extends linearly and an inner surface of the side walls ( 35 ) extends linearly and parallel to the outer surface of the outer rim ( 27 ), and
wherein an elastically compressible sealing element ( 31 ) is arranged between the outer rim ( 27 ) and the side walls ( 35 ).

Assignees

• Bosch Gmbh Robert

Inventors

• Feigl Markus
• Gerundt Oliver

Classifications

• H01M50/184

  characterised by their shape or structure · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/167

  by crimping · CPC title

• H01M50/171

  using adhesives or sealing agents · CPC title

• H01M2/0439

  Electricity · mapped topic