Electrochemical Energy Store, Means of Transport, Cell Vent and Method for Manufacturing a Cell Vent

Abstract

The present disclosure is directed to an electrochemical energy store, a means of transport, a manufacturing method and a cell vent for an electrochemical energy store. In one form a cell vent comprises a first layer comprising a metal and a second layer comprising a first plastic, wherein the first layer and the second layer are arranged successively with respect to a pressure differential on the cell vent.

Claims

1-10. (canceled)

11. A cell vent for an electrochemical energy store, comprising: a first layer comprising a metal; and a second layer comprising a first plastic; wherein the first layer and the second layer being arranged lying one behind the other with respect to a pressure differential at the cell vent.

12. The cell vent of claim 11, wherein the first layer has a predetermined breaking point comprising a third plastic.

13. The cell vent of claim 11, wherein the first layer has a predetermined breaking point in the form of a ring.

14. The cell vent of claim 12, wherein the first plastic has a lower temperature resistance than the third plastic.

15. The cell vent of claim 11, wherein the first layer and the second layer are at least one of laminated or adhesively bonded directly one on top of the other.

16. The cell vent of claim 11, wherein the first layer and the second layer are arranged separately from one another.

17. The cell vent of claim 11, wherein the second layer is configured to resist a smaller maximum gas pressure in the electrochemical energy store than the first layer.

18. The cell vent of claim 11, wherein the second layer comprises an inlay of a second plastic, which has a multiplicity of openings closed by the first plastic.

19. The cell vent of claim 18, wherein the first plastic has a lower temperature resistance than the second plastic.

20. A method for manufacturing a cell vent for an electrochemical energy store, comprising: a first layer comprising a metal; and a second layer comprising a first plastic, wherein the first layer and the second layer being arranged lying one behind the other with respect to a pressure differential at the cell vent, the method comprising: punching out the first layer from a first sheet; punching out the second layer from a second sheet; closing an opening in a cell housing for an electrochemical energy store by means of the first layer and the second layer, the second layer being arranged between the first layer and an interior of the cell housing.

21. An electrochemical energy store, comprising: a cell vent, comprising a first layer comprising a metal; and a second layer comprising a first plastic; wherein the first layer and the second layer being arranged lying one behind the other with respect to a pressure differential at the cell vent.

22. A means for transport comprising a cell vent for an electrochemical energy store, the cell vent comprising: a first layer comprising a metal; and a second layer comprising a first plastic; wherein the first layer and the second layer being arranged lying one behind the other with respect to a pressure differential at the cell vent.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Further details, features and advantages of the invention emerge from the following description and the figures, in which:

[0020] FIG. 1 shows a schematic representation of an exemplary embodiment of a means of transport according to the invention with an exemplary embodiment of an electrochemical energy store according to the invention with an exemplary embodiment of a cell vent;

[0021] FIG. 2 shows a perspective view of a detail of an exemplary embodiment of the cell vent; and

[0022] FIG. 3 shows steps of an exemplary embodiment of an exemplary embodiment of the method for manufacturing a cell vent.

DETAILED DESCRIPTION OF THE DRAWINGS

[0023] FIG. 1 shows an electrically driveable passenger car as a means of transport 10, which has a traction energy store as electrochemical energy store 2. For reducing an overpressure when there is a fault, the electrochemical energy store 2 is protected by a cell vent 1, which is described in detail in FIG. 2.

[0024] FIG. 2 shows an electrochemical energy store 2, in the housing 11 of which a cell vent 1 is installed. The cell vent 1 comprises in an opening 9 a first layer 3 and, lying thereunder, a second layer 6, so that the layers 3, 6 are arranged lying one behind the other. At the same time, the second layer 6 is arranged closer to the interior of the cell than the first layer 3. The first layer 3 has a membrane of metal 4, which has an annular predetermined breaking point, comprising a third plastic 5. When the third plastic 5 melts or otherwise yields, a circular opening within the first layer 3 is exposed for the escape of gas and material. The second layer 6 has a mesh of a second plastic 8 and has a first plastic 7 coating the mesh and closing the openings in the mesh. The first plastic 7 has comparatively little temperature resistance, so that, of the materials presented, it is the first to yield in the event of a thermal triggering. As a result, openings in the mesh of the second plastic 8 are exposed and, as a consequence, the first layer 3 is subjected to thermal and pressure-related loading. As soon as the predetermined breaking point in the form of the third plastic 5 has responded, gas and material can escape substantially unhindered and blocking of the opening 9 does not have to be feared because of the prompt response of the cell vent 1.

[0025] FIG. 3 shows steps of a method for manufacturing a cell vent 1 such as that which has been presented in detail in FIG. 2. In a first step 100, the first layer is punched out from a first sheet. In a second step 200, the second layer is punched out from a second sheet. For this purpose, the first sheet and the second sheet may first be laid one on top of the other and punched out in a common punching step. In other words, the steps 100 and 200 may be performed at the same time or one after the other in time (in any desired sequence). In step 300, an opening in a cell housing for an electrochemical energy store is closed by means of the first layer and the second layer. For this purpose, a heat input which seals the first layer and the second layer fluid-tightly to the opening of the electrochemical energy store is chosen in the edge region of the first layer and the second layer. The second layer is arranged closer to the interior of the cell, and consequently placed between the storage cells and the first layer.

LIST OF REFERENCE SIGNS

[0026] 1 Cell vent [0027] 2 Electrochemical energy store [0028] 3 First layer [0029] 4 Metal [0030] 5 Third plastic [0031] 6 Second layer [0032] 7 First plastic [0033] 8 Second plastic [0034] 9 Opening [0035] 10 Means of transport [0036] 11 Housing [0037] 100 to 300 Method steps