Battery module for a motor vehicle and method for the production thereof

1. A battery module for a motor vehicle, comprising:

a battery module housing with an insertion opening extending into the battery module housing in a longitudinal direction; and

a battery cell package arranged in the battery module housing, the battery cell package having:

battery cells with opposite ends spaced apart in the longitudinal direction so that the battery cells are arranged parallel to one another,

at least one compression pad having opposite longitudinal ends spaced apart in the longitudinal direction, the at least one compression pad being arranged parallel to the battery cells, the battery cells and the at least one compression pad being stacked one on top of the other in a thickness direction that is transverse to the longitudinal direction, and

two insertion auxiliary layers that respectively form outer sides of the battery cell package that are situated oppositely in the thickness direction, the insertion auxiliary layers having opposite ends projecting in the longitudinal direction to positions that are beyond opposite ends of the battery cells and the at least one compression pad, wherein:

the battery cell package is inserted in the longitudinal direction through the insertion opening into the battery module housing, and the opposite ends of the insertion auxiliary layers are deformed inwardly and toward one another.

2. The battery module of claim 1 , wherein the battery module housing is formed from an aluminum extruded profile.

3. The battery module of claim 1 , wherein the at least one compression pad comprises two compression pads arranged parallel to the battery cells and arranged respectively between an outer battery cell and one of the insertion auxiliary layers.

4. The battery module of claim 3 , wherein each of the insertion auxiliary layers is formed from a metal sheet.

5. The battery module of claim 3 , wherein each of the insertion auxiliary layers is formed from fiber-reinforced plastic.

6. The battery module of claim 5 , wherein the fiber-reinforced plastic is formed from fibers extending parallel to the insertion direction.

7. The battery module of claim 1 , further comprising a friction-reducing coating arranged on at least one of an outside of the insertion auxiliary layers or on an inside of inner walls of the battery module housing that are situated opposite the insertion auxiliary layers.

8. The battery module of claim 7 , wherein the friction-reducing coating is a polytetrafluoroethylene coating.

9. The battery module of claim 1 , wherein the battery cells, the at least one compression pad and the insertion auxiliary layers are adhesively bonded to one another.

10. The battery module of claim 1 , further comprising opposite end plates at positions opposed respectively to the opposite ends of the battery cells, the opposite end plates being fastened respectively to the opposite longitudinal ends of the insertion auxiliary layers.

11. The battery module of claim 1 , wherein the insertion auxiliary layers are thinner than the at least one compression pad and thinner than the battery cells in the thickness direction, and the insertion auxiliary layers being deformable in the thickness direction.

12. The battery module of claim 1 , wherein the battery cells and the at least one compression pad being stacked one on top of the other so that each of the battery cells is positioned adjacent at least one other one of the battery cells, the at least one compression pad comprising two compression pads disposed respectively between the two insertion auxiliary layers and one of the battery cells.

13. A method for producing a battery module, comprising:

providing a battery module housing with an insertion opening extending into the battery module housing in a longitudinal direction;

providing a battery cell package that has battery cells with opposite ends spaced apart in the longitudinal direction so that the battery cells are arranged parallel to one another and at least one compression pad arranged parallel to the battery cells, the battery cells and the at least one compression pad being stacked one on top of the other in a thickness direction and the battery cell package also having two insertion auxiliary layers that respectively form outer sides of the battery cell package and that are situated oppositely in the thickness direction, the insertion auxiliary layers having opposite ends projecting beyond the opposite ends of the battery cells in the longitudinal direction;

compressing the battery cell package in the thickness direction; and

inserting the compressed battery cell package in an insertion direction through the insertion opening into the battery module housing, wherein the opposite longitudinal ends of the insertion auxiliary layers that project beyond the opposite ends of the battery cells are deformed inward and toward one another relative to parts of the insertion auxiliary layers that align in the thickness direction with the battery cells and the at least one compression pad.

14. The method of claim 13 , wherein the insertion direction and the thickness direction run approximately orthogonal to one another.

15. The method of claim 14 , wherein the step of compressing the battery cell package comprises compressing the battery cell package between cylindrical rollers.

16. The method of claim 13 , further comprising positioning opposite end plates at positions opposed respectively to the opposite ends of the battery cells, and fastening the opposite longitudinal ends of the insertion auxiliary layers to the respective end plates.

17. The method of claim 13 , further comprising arranging a friction reducing coating on outwardly facing surfaces of the insertion auxiliary layers.

18. The method of claim 13 , further comprising arranging a friction reducing coating on inwardly facing surfaces of the battery module housing.

19. The method of claim 13 , further comprising adhesively bonding the insertion auxiliary layers to the at least one compression pad or to at least one of the battery cells.