METHOD FOR PRODUCING A BATTERY CELL

1 . A method for producing a battery cell, comprising:

a) providing a housing having a first volume, and, in the first volume, a multiplicity of electrodes stacked one on top of another and an electrolyte, wherein the electrolyte is introduced into the first volume via an unsealed opening;

b) degassing the first volume via the opening and closing the opening with a closing element, wherein the closing element and the opening form a non-material connection;

c) arranging a chamber on the housing so that the opening and the closing element are arranged inside the chamber and so that at least one part of the housing is arranged outside the chamber;

d) creating a negative pressure in the chamber; and

e) providing a laser welding device and materially connecting the closing element to the housing using a laser beam, so that the opening is sealed gas-tight by the material connection thus created.

2 . The method according to claim 1 , in which the laser beam is coupled into the chamber via a transparent wall of the chamber.

3 . The method according to claim 1 ,

wherein the chamber has a bearing surface for contacting the housing, and

wherein the bearing surface is designed to seal the chamber gas-tight from an environment.

4 . The method according to claim 1 , wherein the chamber has a second volume which is smaller than the first volume.

5 . The method according to claim 4 , wherein the second volume is at most 5 percent of the first volume.

6 . The method according to claim 1 , wherein the closing element comprises a sealing material by which the opening is closed in a liquid-tight manner before step c).

7 . The method according to claim 1 , wherein the closing element is connected to the housing in a form-fitting manner before step c).

8 . The method according to claim 1 , wherein the negative pressure in the chamber is less than 30 mbar.