METHOD FOR PRODUCING A TRACTION BATTERY OF A MOTOR VEHICLE AND CORRESPONDING PRODUCTION DEVICE

Abstract

A method for producing a traction battery of a motor vehicle. At least one cell module having multiple battery cells is arranged in a receptacle compartment of a battery housing of the traction battery. The battery cells are provided with a separate temperature sensor At least one temperature sensor is arranged on a metal carrier in each case and the metal carrier is welded to a cell housing of the respective battery cell.

Claims

1. A method for producing a traction battery of a motor vehicle, wherein at least one cell module having multiple battery cells is arranged in a receptacle compartment of a battery housing of the traction battery, wherein each of the battery cells are provided with a separate temperature sensor, wherein at least one temperature sensor is arranged in each case on a metal carrier and the metal carrier is welded to a cell housing of the respective battery cell.

2. The method according to claim 1, wherein each of the battery cells has at least one terminal for electrical contacting and the terminals of multiple battery cells are electrically connected to one another via a common connector, wherein the connector is welded to the terminals.

3. The method according to claim 1, wherein the connector is welded to the terminals in the same work step as the metal carrier is welded to the cell housing.

4. The method according to claim 1, wherein the welding is carried out by laser welding.

5. The method according to claim 1, wherein the connector is welded to the terminals by means of the same laser head or at the same time as the metal carrier is welded to the cell housing.

6. The method according to claim 1, wherein the at least one temperature sensor is arranged on a printed circuit board which is connected to the metal carrier.

7. The method according to claim 1, wherein a flexible printed circuit board is used as the printed circuit board.

8. The method according to claim 1, wherein the metal carrier has a retaining foot which is wider than a connecting region carrying the at least one temperature sensor and is welded to the cell housing of the respective battery cell.

9. The method according to claim 1, wherein a prismatic battery cell is used as the battery cell.

10. A production device for producing a traction battery of a motor vehicle, wherein the production device is provided and designed to arrange at least one cell module having multiple battery cells in a receptacle compartment of a battery housing of the traction battery, wherein the production device is further provided and designed to provide each of the battery cells with a separate temperature sensor, wherein at least one temperature sensor is arranged on a metal carrier in each case and the metal carrier is welded to a cell housing of the respective battery cell.

11. The method according to claim 2, wherein the connector is welded to the terminals in the same work step as the metal carrier is welded to the cell housing.

12. The method according to claim 2, wherein the welding is carried out by laser welding.

13. The method according to claim 3, wherein the welding is carried out by laser welding.

14. The method according to claim 2, wherein the connector is welded to the terminals by means of the same laser head or at the same time as the metal carrier is welded to the cell housing.

15. The method according to claim 3, wherein the connector is welded to the terminals by means of the same laser head or at the same time as the metal carrier is welded to the cell housing.

16. The method according to claim 4, wherein the connector is welded to the terminals by means of the same laser head or at the same time as the metal carrier is welded to the cell housing.

17. The method according to claim 2, wherein the at least one temperature sensor is arranged on a printed circuit board which is connected to the metal carrier.

18. The method according to claim 3, wherein the at least one temperature sensor is arranged on a printed circuit board which is connected to the metal carrier.

19. The method according to claim 4, wherein the at least one temperature sensor is arranged on a printed circuit board which is connected to the metal carrier.

20. The method according to claim 5, wherein the at least one temperature sensor is arranged on a printed circuit board which is connected to the metal carrier.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0031] In the following, the invention will be explained in greater detail with reference to the exemplary embodiments depicted in the drawings, without this restricting the invention. In the figures:

[0032] FIG. 1 shows a schematic illustration of a part of a traction battery of a motor vehicle, namely a battery cell of a cell module,

[0033] FIG. 2 shows a schematic illustration of an arrangement made up of a temperature sensor and a metal carrier in a first illustration, and

[0034] FIG. 3 shows the arrangement made up of the temperature sensor and the metal carrier in a second illustration.

DETAILED DESCRIPTION

[0035] FIG. 1 shows a schematic illustration of a region of a traction battery 1 which has at least one cell module (not shown in greater detail here). The cell module has multiple battery cells 2, one of which is shown here. The battery cell 2 has a cell housing 3 on which two electrical terminals 4 and 5 are arranged. In addition, the cell housing 3 has a safety valve 6 in order to prevent excessive internal pressure in the battery cell 2.

[0036] A temperature sensor 7 is fastened to the cell housing 3, namely via a metal carrier 8. The metal carrier 8 is welded to the cell housing 3 of the battery cell 2. Each of the battery cells 2 of the traction battery 1 is preferably assigned a separate temperature sensor 7, each of which is connected to the respective cell housing 3 of the corresponding battery cell 2 via a metal carrier 8.

[0037] The connection of the temperature sensor 7 to the cell housing 3 via the metal carrier 8 has the advantage that very effective thermal coupling is established between the temperature sensor 7 and the cell housing 3, so that the temperature of the battery cell 2 can be measured with high accuracy by means of the temperature sensor 7. In addition, the connection of the temperature sensor 7 to the cell housing 3 is resistant to aging and therefore does not depend, or only to a very small extent, on the age of the traction battery 1 or the battery cell 2.

[0038] FIG. 2 shows an extremely schematic illustration of an arrangement made up of the temperature sensor 7 and the metal carrier 8. In the exemplary embodiment shown here, multiple temperature sensors 7 are arranged on the metal carrier 8 and connected to the cell housing 3 via this. Electrical contacting with the temperature sensor 7 takes place via a printed circuit board 9, which in the exemplary embodiment shown here is preferably a flexible printed circuit board.

[0039] The metal carrier 8 has a retaining foot 10 and a connecting region 11. The retaining foot 10 is welded to the cell housing 3 of the respective battery cell 2. The temperature sensor 7 is connected to the retaining foot 10 via the connecting region 11. The retaining foot 10 and the connecting region 11 are embodied in one piece and made of the same material, that is to say they consist of the same continuous material.

[0040] FIG. 3 shows an alternative view of the arrangement made up of temperature sensor 7 and metal carrier 8 already described. It can be seen that the retaining foot 10 has a greater width than the connecting region 11 and preferably protrudes on both sides over the connecting region 11 in one direction. This ensures perfect contacting of the metal carrier 8 on the cell housing 3, i.e., simple welding. For example, the metal carrier 8 is connected to the cell housing 3 via at least one spot weld, but particularly preferably via multiple spot welds, in order to achieve a particularly reliable mounting of the temperature sensor 7 on the cell housing 3.

[0041] The described design of the traction battery 1 or the described procedure for connecting the temperature sensor 7 to the battery cell 2 has the advantage that, on the one hand, a highly accurate measurement of the temperature of the respective battery cell 2 can take place. In addition, the connection of the temperature sensor 7 is largely independent of the effects of aging, so that the accuracy of the temperature measurement is ensured over the service life of the traction battery 1.

LIST OF REFERENCE NUMERALS

[0042] 1 traction battery [0043] 2 battery cell [0044] 3 cell housing [0045] 4 terminal [0046] 5 terminal [0047] 6 safety valve [0048] 7 temperature sensor [0049] 8 metal carrier [0050] 9 printed circuit board [0051] 10 retaining foot [0052] 11 connecting region