RELEASABLE ADHESIVE CONNECTION, AND METHOD FOR RELEASING THE ADHESIVE CONNECTION

Abstract

A releasable adhesive connection between two joint partners, which are materially bonded to one another by means of an adhesive, wherein the adhesive connection is releasable in a separating process by an introduction of heat. According to the disclosure, the introduction of heat is performed using a heated thermofluid. A first joint partner comprises at least one fluid chamber, which is filled at least in the separating process using the thermofluid and which indirectly or directly adjoins the adhesive with a chamber wall, so that in the separating process, the introduction of heat into the adhesive takes place by means of heat conduction from the thermofluid via the chamber wall into the adhesive.

Claims

1-11. (canceled)

12. A releasable adhesive connection between two joint partners comprising: the two joint partners are materially connected to one another by an adhesive, wherein the adhesive connection is releasable in a separating process by an introduction of heat, wherein the introduction of heat is performed using a heated thermofluid, and in that at least one first joint partner further comprises at least one fluid chamber, which is filled at least in the separating process using the thermofluid and which indirectly or directly adjoins the adhesive with a chamber wall, so that in the separating process, the introduction of heat into the adhesive takes place by heat conduction from the thermofluid via the chamber wall into the adhesive.

13. The releasable adhesive connection as claimed in claim 12, wherein the first joint partner is designed as a thermofluid-conducting component and/or is incorporated into a preferably closed heating circuit, and in that in particular in the heating circuit, the thermofluid is conducted via a supply connecting part into the fluid chamber of the first joint partner and/or is conducted via a return connecting part out of the fluid chamber of the first joint partner, specifically in particular with forced conduction by means of a flow unit, such as a circulating pump.

14. The releasable adhesive connection as claimed in claim 13, wherein a heating unit and a thermofluid reservoir are integrated into the heating circuit in addition to the flow unit and the fluid chamber of the first joint partner.

15. The releasable adhesive connection as claimed in claim 14, wherein the heating circuit is divided into a first partial circuit on the joint partner side and a second partial circuit, which can be decoupled from the first joint partner, and in that in particular the second partial circuit can be fluidically decoupled from the first joint partner at the supply and return connecting pieces.

16. The releasable adhesive connection as claimed in claim 15, wherein the second partial circuit, which can be decoupled from the first joint partner, comprises the flow unit, the heating unit, and the thermofluid reservoir.

17. The releasable adhesive connection as claimed in claim 14, wherein the flow unit, the heating unit, and possibly a supply and/or return temperature sensor are parts of a control loop, in which a regulating unit in the separating process activates the heating unit and/or the flow unit on the basis of the detected supply and/or return temperature.

18. The releasable adhesive connection as claimed in claim 17, wherein an input unit, by means of which a heating time and/or a heating temperature of the thermofluid can be predetermined, is associated with the regulating unit.

19. The releasable adhesive connection as claimed in claim 12, wherein the thermofluid is, for example, a mineral oil, and/or in that the adhesive is, for example, a polyurethane adhesive, in which after heating to, for example, 220 C. with a holding time of, for example, 10 seconds, a complete release of the adhesive connection occurs.

20. The releasable adhesive connection as claimed in claim 12, wherein the first joint partner is a multi-chamber extruded profile part and is in particular produced from a metal of high thermal conductivity, for example, a light metal such as an aluminum alloy.

21. The releasable adhesive connection as claimed claim 12, wherein the first joint partner is a frame structure of an electrically operated vehicle, which is constructed from longitudinal beams and crossbeams and which encloses a traction battery of the vehicle, and in that the longitudinal beams and/or crossbeams have a detachable adhesive connection to the traction battery with the inner walls thereof, and in that the longitudinal beams and/or crossbeams are permeated by the thermofluid in the separating process to remove the traction battery.

22. The releasable adhesive connection as claimed in claim 15, wherein the flow unit, the heating unit, and possibly a supply and/or return temperature sensor are parts of a control loop, in which a regulating unit in the separating process activates the heating unit and/or the flow unit on the basis of the detected supply and/or return temperature.

23. The releasable adhesive connection as claimed in claim 16, wherein the flow unit, the heating unit, and possibly a supply and/or return temperature sensor are parts of a control loop, in which a regulating unit in the separating process activates the heating unit and/or the flow unit on the basis of the detected supply and/or return temperature.

24. The releasable adhesive connection as claimed in claim 13, wherein the thermofluid is, for example, a mineral oil, and/or in that the adhesive is, for example, a polyurethane adhesive, in which after heating to, for example, 220 C. with a holding time of, for example, 10 seconds, a complete release of the adhesive connection occurs.

25. The releasable adhesive connection as claimed in claim 14, wherein the thermofluid is, for example, a mineral oil, and/or in that the adhesive is, for example, a polyurethane adhesive, in which after heating to, for example, 220 C. with a holding time of, for example, 10 seconds, a complete release of the adhesive connection occurs.

26. The releasable adhesive connection as claimed in claim 15, wherein the thermofluid is, for example, a mineral oil, and/or in that the adhesive is, for example, a polyurethane adhesive, in which after heating to, for example, 220 C. with a holding time of, for example, 10 seconds, a complete release of the adhesive connection occurs.

27. The releasable adhesive connection as claimed in claim 16, wherein the thermofluid is, for example, a mineral oil, and/or in that the adhesive is, for example, a polyurethane adhesive, in which after heating to, for example, 220 C. with a holding time of, for example, 10 seconds, a complete release of the adhesive connection occurs.

28. The releasable adhesive connection as claimed in claim 17, wherein the thermofluid is, for example, a mineral oil, and/or in that the adhesive is, for example, a polyurethane adhesive, in which after heating to, for example, 220 C. with a holding time of, for example, 10 seconds, a complete release of the adhesive connection occurs.

29. The releasable adhesive connection as claimed in claim 18, wherein the thermofluid is, for example, a mineral oil, and/or in that the adhesive is, for example, a polyurethane adhesive, in which after heating to, for example, 220 C. with a holding time of, for example, 10 seconds, a complete release of the adhesive connection occurs.

30. The releasable adhesive connection as claimed in claim 13, wherein the first joint partner is a multi-chamber extruded profile part and is in particular produced from a metal of high thermal conductivity, for example, a light metal such as an aluminum alloy.

31. The releasable adhesive connection as claimed in claim 14, wherein the first joint partner is a multi-chamber extruded profile part and is in particular produced from a metal of high thermal conductivity, for example, a light metal such as an aluminum alloy.

Description

[0018] An exemplary embodiment of the invention is described hereafter with the aid of the appended figures.

[0019] In the figures:

[0020] FIG. 1 shows an enlarged perspective illustration in partial section of an adhesive connection between a vehicle body longitudinal beam of an electrically operated vehicle and a traction battery of the vehicle and also a thermofluid partial circuit decoupled therefrom;

[0021] FIG. 2 shows a view corresponding to FIG. 1 having thermofluid partial circuit fluidically coupled on the vehicle body longitudinal beam;

[0022] FIG. 3 shows a rough schematic illustration of a body-side frame structure having traction battery adhesively connected therein in a view from above; and

[0023] FIG. 4 shows a further exemplary embodiment in a view corresponding to FIG. 3.

[0024] A releasable adhesive connection is shown in FIG. 1, in which the vehicle body longitudinal beam 1 of an electrically operated vehicle (not shown in greater detail) is adhesively connected via an adhesive 4 to a traction battery 3 of the electrically operated vehicle. The vehicle body longitudinal beam 1 is part of a closed frame structure 5 shown in FIG. 3, in which the lateral vehicle body longitudinal beams 1 are connected to one another in the vehicle transverse direction y by means of front and rear crossbeams 7. The longitudinal beams and crossbeams 1, 7 are adhesively connected on the inner side via the adhesive 4 to the traction battery 3.

[0025] Both the longitudinal beams 1 and also the crossbeams 7 are formed by way of example from multi-chamber extruded profile parts, as shown by way of example in FIGS. 1 and 2 with the aid of one of the vehicle body longitudinal beams 1. As a result, a vehicle-interior chamber facing toward the traction battery 3 in the multi-chamber profile of the vehicle body longitudinal beam 1 forms a fluid chamber 9, which is delimited toward the vehicle interior via an inner chamber wall 11. The chamber wall 11 forms a contact surface 13 wetted using the adhesive 4 on its inner side in the vehicle transverse direction y. In the same manner, the further longitudinal beam 1 and also the two crossbeams 7 are implemented having such a fluid chamber 9, wherein all fluid chambers 9 of the longitudinal beams and crossbeams 1, 7 are terminated fluid-tight to the outside and are fluidically connected to one another.

[0026] In a separating process described later with the aid of FIG. 2, the fluid chambers 9 of the longitudinal beams and crossbeams 1, 7 are permeated by a heated thermofluid 15, with the aid of which an introduction of heat takes place by heat conduction via the inner chamber wall 11 into the adhesive 4 to release it.

[0027] As indicated by way of example in FIG. 2, the fluid chambers 9 of the longitudinal beams and crossbeams 1, 7 can be incorporated into a closed heating circuit H. In the heating circuit H, the thermofluid 15 is introduced via a supply connecting part 17 into the fluid chambers 9 of the frame structure 5 and conducted out of the fluid chambers 9 of the frame structure 5 via a return connecting part 19. As shown in FIG. 1 or 2, the heating circuit H comprises a circulating pump 21 and a thermofluid tank 23, in which a heating unit 25 is integrated. A supply temperature sensor 29 is arranged in a supply line 27, while a return temperature sensor 33 is arranged in a return line 31. Both the supply connecting part 17 and also the return connecting part 19 are implemented as quick-action couplings, on which the supply line 27 and the return line 31 can be readily coupled or decoupled. In this manner, the heating circuit H can be divided into a first vehicle-side partial circuit H1, which comprises the fluid chambers 9, and a second partial circuit H2, which comprises the circulating pump 21, the thermofluid tank 23, and the temperature sensors 29, 33 and can be decoupled from the vehicle.

[0028] The circulating pump 21, the heating unit 25 installed in the thermofluid tank 23, and the two supply and return temperature sensors 29, 33 are, in FIGS. 1 and 2, parts of an electronic control loop R, in which a regulating unit 35 has a signaling connection (shown by dashed lines) to the supply and return temperature sensors 29, 33 and to the heating unit 25 and the circulating pump 21. The regulating unit 35 is moreover associated in FIGS. 1 and 2 with an input unit 37, by means of which a heating duration and a heating temperature of the thermofluid 15 can be predetermined.

[0029] In FIG. 2, the second partial circuit H2 is fluidically coupled on the frame structure 5 to carry out a separating process, in which the adhesive connection between the frame structure 5 and the traction battery 3 is released. For this purpose, the circulating pump 21 and the heating unit 25 are activated to flood the fluid chambers 9 of the frame structure 5 using heated thermofluid 15. The thermofluid 15 can in this case have a temperature of, for example, 220 C. and can permeate the frame structure 5 over a process duration of, for example, one or two minutes. The process parameters in the separating process are designed so that the thermal energy introduced by the thermofluid 15 into the adhesive bond is sufficient to heat the adhesive 4 enough that a complete release of the adhesive connection occurs.

[0030] A further exemplary embodiment of the invention is shown in FIG. 4, which is fundamentally embodied structurally identical to the preceding exemplary embodiment. In contrast to FIG. 3, two fluid chambers 9 fluidically separated from one another are provided. The two fluid chambers each comprise a separate supply 17 and drain 19.