Pouch film for a battery cell system

1. A pouch film ( 3 ) for a battery cell system ( 1 ), the pouch film ( 3 ) having a longitudinal direction and comprising mutually separate pockets ( 12 ) for insertion of electrode assemblies ( 5 ), the pockets ( 12 ) being impermeable to electrolyte, and the pockets ( 12 ) being physically connected to one another in a foldable manner via the pouch film ( 3 ), wherein the pouch film ( 3 ) has a fold pattern between the pockets ( 12 ), wherein the fold pattern has a central region ( 15 a ) substantially parallel to the longitudinal direction and flanking regions ( 15 b ) surrounding the central region ( 15 a ) and substantially orthogonal to the central region ( 15 a ), and wherein the flanking regions ( 15 b ) are separate from the pockets ( 12 ).

2. The pouch film ( 3 ) according to claim 1 , characterized in that the pouch film ( 3 ) is a composite film that does not comprise any aluminum.

3. A battery cell system ( 1 ), comprising a pouch film ( 3 ) according to claim 1 , having at least two pockets ( 12 ) and having at least two electrode assemblies ( 5 ), characterized in that the electrode assemblies ( 5 ) are inserted in the mutually separate pockets ( 12 ) of the pouch film ( 3 ), such that respectively one electrode assembly ( 5 ), together with a pocket ( 12 ) of the pouch film ( 3 ), forms a pouch cell ( 10 ), the pouch cells ( 10 ) being physically connected to one another in a foldable manner via the pouch film ( 3 ).

4. The battery cell system ( 1 ) according to claim 3 , characterized in that the pouch film ( 3 ) has a length (L) and a width (B), and the pouch film ( 3 ) is folded over along the longitudinal extent, such that there are two pouch film halves ( 3 a , 3 b ) that are disposed on one another and that have an open end and an end that is closed by folding-over of the pouch film ( 3 ), and the pouch film halves ( 3 a , 3 b ) are joined together, along the width (B), at intervals, in such a manner that there are pockets ( 12 ) that are spatially separate from one another.

5. The battery cell system ( 1 ) according to claim 4 , characterized in that the pockets ( 12 ) of the pouch film ( 3 ) are closed along the length (L), at least partly, at their open end, by joining together of the two pouch film halves ( 3 a , 3 b ).

6. The battery cell system ( 1 ) according to claim 4 , characterized in that the joining together of the pouch film halves ( 3 a , 3 b ) is effected in the form of seams, the seams that separate the pockets ( 12 ) from one another along the width (B) being transverse seams ( 14 a ), and the seam ( 14 ) that closes the pockets ( 12 ) along the length (L) being a longitudinal seam ( 14 b ).

7. The battery cell system ( 1 ) according to claim 3 , characterized in that at least one anode contact lug ( 7 ) of an anode of the electrode assembly ( 5 ) and at least one cathode contact lug ( 8 ) of a cathode of the electrode assembly ( 5 ) project beyond the pocket ( 12 ), on the same side of the pocket ( 12 ), or on opposite sides of the pocket ( 12 ).

8. A method for producing a battery cell system ( 1 ) according to claim 3 , a pouch film ( 3 ) having a length (L) and a width (B), the method comprising the following steps:

A) Applying electrode assemblies ( 5 ), comprising at least one anode having at least one anode contact lug ( 7 ), at least one separator, and at least one cathode having at least one cathode contact lug ( 8 ), to the pouch film ( 3 ), the anode contact lugs ( 7 ) and the cathode contact lugs ( 8 ) projecting beyond a first lateral length (L 1 ) of the pouch film ( 3 ), and the electrode assemblies ( 5 ) covering not more than half of the width (B) of the pouch film ( 3 ) and lying on the pouch film ( 3 ), spaced apart from one another;

B) Folding over the pouch film ( 3 ) along the length (L), such that the width (B) of the pouch film ( 3 ) is in particular halved, and the pouch film ( 3 ) has a first pouch film half ( 3 a ) and a second pouch film half ( 3 b ), which form a type of cavity, within which the electrode assemblies ( 5 ) are located;

C) Joining together the two pouch film halves ( 3 a , 3 b ) at, in particular, regular intervals along the width (B) of the pouch film ( 3 ), so as to produce adjoining pockets ( 12 ) by which the electrode assemblies ( 5 ) as surrounded; and

D) Joining together the pouch film halves ( 3 a , 3 b ) at their open ends.

9. A method for producing a battery cell system ( 1 ) according to claim 3 , a pouch film ( 3 ) having a length (L) and a width (B), and the pouch film ( 3 ) having recesses ( 33 ), the method comprising the following steps:

AA) Applying electrode assemblies ( 5 ) comprising at least one anode having at least one anode contact lug ( 7 ), at least one separator, and at least one cathode having at least one cathode contact lug ( 8 ), to the pouch film ( 3 ), the anode contact lugs ( 7 ) and the cathode contact lugs ( 8 ) being disposed on opposite sides in the direction of a first lateral width (B 1 ) and a second lateral width (B 2 ) of the pouch film ( 3 ), and the electrode assemblies ( 5 ) covering not more than half of the width (B) of the pouch film ( 3 ) and lying on the pouch film ( 3 ), spaced apart from one another;

BB) Contacting respectively one anode contact lug ( 7 ) of an electrode assembly ( 5 ) to respectively one cathode contact lug ( 8 ) of an adjacent electrode assembly ( 5 );

CC) Folding over the pouch film ( 3 ) along the length (L), and the pouch film ( 3 ) forms a type of cavity, within which the electrode assemblies ( 5 ) are located, and the recesses ( 33 ) of the pouch film ( 3 ) are disposed on the anode contact lugs ( 7 ) and cathode contact lug ( 8 ) that are connected to one another, such that they can be electrically contacted;

DD) Joining together along the width (B) at regular intervals, the pouch film pieces that lie on one another, so as to produce adjoining pockets ( 12 ), by which the electrode assemblies ( 5 ) are surrounded; and

EE) Joining together the open ends of the pouch film ( 3 ) along the length (L).

10. A method for producing a battery cell system ( 1 ) according to claim 3 , a pouch film ( 3 ) having a length (L) and a width (B), the length (L) of the pouch film ( 3 ) in particular being longer than the width (B), having the following steps

AAA) Applying electrode assemblies ( 5 ) comprising at least one anode having at least one anode contact lug ( 7 ), at least one separator, and at least one cathode having at least one cathode contact lug ( 8 ), to the pouch film ( 3 ), the anode contact lugs and ( 7 ) the cathode contact lugs ( 8 ) being disposed on opposite sides in the direction of a first lateral width (B 1 ) and in the direction of a second lateral width (B 2 ) of the pouch film ( 3 ), and the electrode assemblies ( 5 ) covering not more than half of the width (B) of the pouch film ( 3 ) and lying on the pouch film ( 3 ), spaced apart from one another;

BBB) Contacting respectively one anode contact lug ( 7 ) of an electrode assembly ( 5 ) to respectively one cathode contact lug ( 8 ) of an adjacent electrode assembly ( 5 ), and contacting the anode contact lug and ( 7 ) the cathode contact lug ( 8 ) to a low-current tab ( 9 ) that constitutes a voltage tap, the low-current tab ( 9 ) projecting beyond a first lateral length (L 1 ) of the pouch film ( 3 );

CCC) Folding over the pouch film ( 3 ) along the length (L), and has a first pouch film half ( 3 a ) and a second pouch film half ( 3 b ), which form a type of cavity, within which the electrode assemblies ( 5 ) are located;

DDD) Joining together the two pouch film halves ( 3 a , 3 b ) along the width (B) at regular intervals, so as to produce adjoining pockets ( 12 ), by which the electrode assemblies ( 5 ) are surrounded; and

EEE) Joining together the pouch film halves ( 3 a , 3 b ) at their open ends.

11. The method according to claim 8 , an electrolyte being introduced into the pockets ( 12 ) of the pouch film ( 3 ).

12. The method according to claim 8 , the joining together of the pouch film halves ( 3 a , 3 b ) being effected by means of a sealing method, such that sealed seams are produced.

13. The method according to claim 8 , wherein, in the joining together of the pouch film ( 3 ) along the width (B), one, two or three pouch film projections ( 15 ) are realized at the ends of transverse seams ( 14 a ).

14. A battery module comprising a pouch film ( 3 ) according to claim 1 .

15. A battery module comprising a battery cell system ( 1 ) according to claim 3 .

16. A method for producing a battery cell system ( 1 ) according to claim 3 , a pouch film ( 3 ) having a length (L) and a width (B), the method comprising the following steps:

A′) Folding over the pouch film ( 3 ) along the length (L), and the pouch film ( 3 ) has a first pouch film half ( 3 a ) and a second pouch film half ( 3 b ), which form a type of cavity, into which the electrode assemblies ( 5 ) can be inserted;

B′) Joining together the two pouch film halves ( 3 a , 3 b ) at regular intervals along the width (B) of the pouch film ( 3 ), so as to produce adjoining pockets ( 12 );

C′) Introducing into the pockets ( 12 ) of the pouch film ( 3 ) electrode assemblies ( 5 ) comprising at least one anode having at least one anode contact lug ( 7 ), at least one separator, and at least one cathode having at least one cathode contact lug ( 8 ), the anode contact lugs ( 7 ) and the cathode contact lugs ( 8 ) projecting beyond a first lateral length L 1 of the pouch film ( 3 ); and

D′) Joining together the pouch film halves ( 3 a , 3 b ) at their open ends.

17. The pouch film ( 3 ) according to claim 1 , wherein the pockets ( 12 ), when the battery cell system ( 1 ) is in an operating state, are physically connected to one another in a foldable manner via the pouch film ( 3 ).

18. The pouch film ( 3 ) according to claim 1 , characterized in that the pouch film ( 3 ) is a composite film that does not comprise any metal.

19. The battery cell system ( 1 ) according to claim 3 , characterized in that the pouch film ( 3 ) has a length (L) and a width (B), the length (L) being longer than the width (B), and the pouch film ( 3 ) is folded over along the longitudinal extent, such that there are two pouch film halves ( 3 a , 3 b ) that are disposed on one another and that have an open end and an end that is closed by folding-over of the pouch film ( 3 ), and the pouch film halves ( 3 a , 3 b ) are joined together, along the width (B), at regular intervals, in such a manner that there are pockets ( 12 ) that are spatially separate from one another.

20. The battery cell system ( 1 ) according to claim 4 , characterized in that the joining together of the pouch film halves ( 3 a , 3 b ) is effected in the form of sealed seams, the seams that separate the pockets ( 12 ) from one another along the width (B) being transverse seams ( 14 a ), and the seam ( 14 ) that closes the pockets ( 12 ) along the length (L) being a longitudinal seam ( 14 b ).