Energy Storage Cell, and Method for Producing an Energy Storage Cell

Abstract

An energy storage cell, in particular a lithium-ion cell, comprising an in particular cylindrical housing main body which extends along a longitudinal axis and forms an arrangement space in which electrode material that is electrically conductively connected to the housing main body is arranged. The arrangement space is delimited at a second end by a cover element and at a first end by a base element. The base element is fastened electrically conductively and gas-tightly to the housing main body by electromagnetic pulse welding.

Claims

1.-15. (canceled)

16. An energy storage cell comprising: a housing body which extends along a longitudinal axis and forms an arrangement space in which electrode material is arranged and has been connected to the housing body in a electrically conducting manner, wherein the arrangement space is delimited at a second end by a cover element, and at a first end by a base element, and wherein the base element has been fastened to the housing body in electrically conducting and gastight manner by electromagnetic pulse welding.

17. The energy storage cell according to claim 16, wherein the base element exhibits a contact surface peripherally for the purpose of fastening.

18. The energy storage cell according to claim 16, wherein the base element exhibits a central portion from which a contact link extends in the direction of the arrangement space or away therefrom, and wherein the contact link bears against the housing body on the inside or on the outside.

19. The energy storage cell according to claim 16, wherein the housing body is connected to the electrode material in a electrically conducting manner via a contact element, and wherein the contact element exhibits peripherally a contact surface via which the contact element has been fastened to the housing body by electromagnetic pulse welding.

20. The energy storage cell according to claim 19, wherein the contact surfaces have been designed and positioned to be fastened simultaneously by the electromagnetic pulse welding.

21. The energy storage cell according to claim 19, wherein the contact surfaces each contact the housing body directly.

22. The energy storage cell according to claim 19, wherein the contact surface of the contact element contacts the housing body indirectly via the base element.

23. The energy storage cell according to claim 19, wherein the contact element has been designed and positioned to act as a supporting element in the course of welding.

24. The energy storage cell according to claim 19, wherein the contact link(s) has/have been designed and shaped to be accelerated in the course of the welding procedure.

25. The energy storage cell according to claim 16, wherein the housing body exhibits a fastening portion which has been designed and positioned to be accelerated in the course of the welding procedure.

26. The energy storage cell according to claim 16, wherein the housing body constitutes the negative pole of the energy storage cell, and wherein the positive pole has been formed in or on the cover element.

27. A method for producing an energy storage cell, comprising: making available a housing body which extends along a longitudinal axis and has been designed to form an arrangement space for electrode material; arranging electrode material in the arrangement space, and establishing an electrically conducting connection to the housing body; and, fastening a base element to one end of the housing body by electromagnetic pulse welding for the purpose of establishing a gastight connection.

28. The method according to claim 27, further comprising: arranging a magnetic coil for the purpose of welding in such a manner that an acceleration of the structural member occurs in the radial direction.

29. The method according to claim 27, further comprising: arranging a magnetic coil for the purpose of welding in such a manner that an acceleration of the structural member occurs in the axial direction.

30. The method according to claim 27, further comprising: using/arranging a supporting element for the purpose of supporting the structural-member portions to be connected in the course of welding.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Further advantages and features arise out of the following embodiments of energy storage cells and of methods with reference to the appended figures.

[0040] FIG. 1: shows a schematic view of an energy storage cell;

[0041] FIG. 2: shows a schematic view for illustrating an embodiment of the method;

[0042] FIG. 3: shows a further schematic view for illustrating a further embodiment of the method;

[0043] FIG. 4: shows a further embodiment for illustrating a further embodiment of the method;

[0044] FIG. 5: shows a further embodiment for illustrating a further embodiment of the method;

[0045] FIG. 6: shows a further embodiment for illustrating a further embodiment of the method;

[0046] FIG. 7: shows a further embodiment for illustrating a further embodiment of the method; and,

[0047] FIG. 8: shows a further embodiment for illustrating a further embodiment of the method.

DETAILED DESCRIPTION OF THE DRAWINGS

[0048] FIG. 1 shows schematically an energy storage cell 10, illustrated as a round cell, including a housing body 14 which extends along a longitudinal axis L. A base element 20 is arranged at a first end. A first or negative pole 11 has been formed there. At an opposing, second end, a cover element 16 has been arranged or formed. A second or positive pole 12 has been provided there. Methods for fastening the base element 20 to the housing body 14 by way of electromagnetic pulse welding are outlined in the following figures.

[0049] FIG. 2 shows, in a schematic partial view, a housing body 14 which extends along a longitudinal axis L. Reference symbol 20 denotes a base element which exhibits a central portion 24 and also a contact link 26. The contact link 26, on which a contact surface 22 has been formed, is accelerated in the direction of the housing body 14 with the aid of a welding device, or a magnetic coil 50. In the right half of the picture, the state can be seen in which the base element 20 has been fastened externally to the housing body 14 in gastight manner via the contact link.

[0050] FIG. 3 shows a further configuration of the method, wherein a base element 20, including a central portion 24 and also a contact link 26 together with a contact surface 22, is fastened internally to a housing body 14. On the outside, a support is effected with the aid of a supporting element which has been illustrated with reference symbol 16. In this configuration, the contact link 60 extends away from the arrangement space. The final state is represented in the right half of the picture.

[0051] FIG. 4 shows a further configuration of the method. In addition to a base element 20, a contact element 40 has also been illustrated here which exhibits a central portion 44 and also a contact link 46 which, in turn, includes a contact surface 42 which bears internally against the housing body 14, or has been fastened there. Here too, the fastening is effected by material closure, particularly preferably with the aid of a pressure-welding method such as resistance welding, cold pressure welding, friction welding or ultrasonic welding. Particularly preferred welding methods are resistance welding, projection welding or gap welding. According to a preferred embodiment, the contact element 40 has also been fastened with the aid of electromagnetic pulse welding. In the embodiment illustrated here, only the base element 20 has been fastened to the housing body 40 with the aid of the magnetic coil 50. For this purpose, the housing body 14 forms a fastening portion 15 which forms a corresponding gap toward the base element 20. The fastening portion 15 is accelerated toward the contact link 26 of the contact element 20 in the course of the electromagnetic pulse welding. However, given an appropriate configuration of the magnetic coil, or even given an appropriate design of the fastening portion 15, it can easily be imagined that both the base element 20 and the contact element 40 can be fastened simultaneously by electromagnetic pulse welding, compare also FIG. 7 for instance. An electrode materialsuch as, for instance, a cell wraphas been illustrated with reference symbol 18. This cell wrap has been fastened to the contact element 40, for instance by way of welding, in particular laser welding.

[0052] FIG. 5 shows substantially the embodiment of the method known from FIG. 4. However, the possible application of a supporting element 60, for the purpose of supporting the partners to be joined from the inside, has also been illustrated. A fastening portion 15 has also been formed differently here, as compared to FIG. 4.

[0053] FIG. 6 shows an embodiment in which a contact element 40 takes the form merely of a disk-shaped element. Here, a base element 20 has been fastened externally to a housing body 14. Given appropriate configuration, it is possible that the contact element 40 here acts directly as a supporting element in the course of the welding process.

[0054] FIG. 7 shows a configuration in which both the base element 20 and the contact element 40 exhibit contact links 44 and 46, respectively, which extend away from the arrangement space of a housing body 14. The contact links 26 and 46 overlap in the radial direction. Both components can be fastened in one method step with a fastening portion 15 of the housing body 14 by way of electromagnetic pulse welding. Alternatively, a contact element configured as in FIG. 7 has already been fastened to the housing body 14 from the inside, and the contact link 26 of the contact element 20 has been formed as a moving structural member which in the course of the electromagnetic pulse welding is fastened to the contact link 46 of the contact element 40 from the inside.

[0055] FIG. 8 shows a further configuration of the method, a magnetic coil 50 being arranged here in such a manner that an acceleration of the structural member takes effect in the axial directionthat is to say, along the longitudinal axis L. A base element 20, including a central portion 24, exhibits an appropriately oriented, or reshaped, contact link 26 which has been designed and positioned to be accelerated in the direction of an appropriately configured housing body 14. For this purpose, the housing body 14 correspondingly exhibits on an end facethat is to say, at the first enda link or flange which is directed to be substantially perpendicular to the longitudinal axis L, in order to serve, as it were, as a stop for the contact link 26 in the course of the electromagnetic pulse welding.

LIST OF REFERENCE SYMBOLS

[0056] 10 energy storage cell [0057] 11 first pole, negative pole [0058] 12 second pole, positive pole [0059] 14 housing body [0060] 15 fastening portion [0061] 16 cover element [0062] 18 electrode material [0063] 20 base element [0064] 22 contact surface [0065] 24 central portion [0066] 26 contact link [0067] 40 contact element [0068] 42 contact surface [0069] 44 central portion [0070] 46 contact link [0071] 50 welding device, magnetic coil [0072] 60 supporting element [0073] L longitudinal axis