Pouch film for a battery cell system

Patent metadata

Field	Value
Publication number	US-2018205046-A1
Application number	US-201715841852-A
Country	US
Kind code	A1
Filing date	Dec 14, 2017
Priority date	Dec 15, 2016
Publication date	Jul 19, 2018
Grant date	—

Abstract

A pouch film ( 3 ) for a battery cell system ( 1 ) is described, the pouch film ( 3 ) forming mutually separate pockets ( 12 ) for the insertion of electrode assemblies ( 5 ), the pockets ( 12 ) being impermeable to electrolyte, and the pockets ( 12 ), particularly when the battery cell system ( 1 ) is in the operating state, being physically connected to one another in a foldable manner via the pouch film ( 3 ).

First claim

1 . A pouch film ( 3 ) for a battery cell system ( 1 ), the pouch film ( 3 ) 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 ).

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 3 , 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 3 , 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 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 ), in particular centrally, 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

Assignees

• Bosch Gmbh Robert

Inventors

• Schmid-Schoenbein Christian

Classifications

• H01M10/0413 Primary

  Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes · CPC title

• H01M10/6555

  arranged between the cells · CPC title

• H01M10/0525 Primary

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

• H01M50/121

  Organic material · CPC title

• H01M2/0275 Primary

  Electricity · mapped topic