ELECTRIC ENERGY STORAGE CELL, ELECTRIC ENERGY STORAGE DEVICE AND MOTOR VEHICLE

Abstract

An electric energy storage cell is provided with a plurality of cell layers. At least two cell layers are equipped with electrically conductive contact elements that are coupled with their electrodes and create at least one connection between the at least two cell layers by an adhesive site realized from a conductive adhesive on the contact elements. At least one connection realized by the adhesive site is interrupted when the adhesive-specific temperature limiting value is exceeded in the adhesive site.

Claims

1-15. (canceled)

16. An electric energy storage cell, comprising: a plurality of cell layers, wherein at least two cell layers are provided with contact elements coupled with their electrodes in an electrically conductive manner, and at least one connection is realized between the at least two cell layers by means of at least one adhesive layer from an electrically conductive adhesive on the contact elements, wherein the at least one connection realized by means of the adhesive is interrupted when an adhesive-specific temperature limiting value is exceeded in the adhesive site.

17. The electric energy storage cell according to claim 16, wherein the adhesive-specific temperature limiting value is greater than a highest temperature of the adhesive permissible.

18. The electric energy storage cell according to claim 16, wherein the adhesive-specific temperature limiting value is selected in such a way that it is exceeded with a fault of the electric energy cell that is caused by a short-circuit.

19. The electric energy storage cell according to claim 16, wherein the adhesive comprises electrically conductive particles that form an electrically conductive network in a cured state of the adhesive, wherein the network is dissolved when the adhesive-specific temperature limiting value is exceeded.

20. The electric energy storage cell according to claim 16, wherein the adhesive comprises, at least in a region of the adhesive, a propellant, which is designed in such a manner that when the adhesive-specific temperature limiting value is exceeded, the adhesive site is expanded in such a manner that the electric connection is interrupted.

21. The electric energy storage cell according to claim 16, wherein the contact elements are mutually in connection with one another in a stack-like form.

22. The electric energy storage cell according to claim 16, wherein the electric energy storage cell is a pouch cell.

23. The electric energy storage cell according to claim 16, wherein two or more contact elements are connected through at least one adhesive site.

24. The electric energy storage cell according to claim 16, wherein three or more contact elements are connected through at least one adhesive site.

25. The electric energy storage cell according to claim 16, wherein one or several contact elements are connected to an electrically conductive conductor body by means of at least one adhesive site.

26. The electric energy storage cell according to claim 16, wherein a free end of one or several contact elements contacting an adhesive site is formed into a heat transfer section.

27. The electric energy storage cell according to claim 26, wherein the heat transfer section is formed with a wavy, spiral, zigzag or helical shape.

28. The electric energy storage cell according to claim 26, wherein the heat transfer section is provided with a larger base surface area in comparison to the remaining part of the contact element.

Description

[0021] Other advantages and details of the invention will become evident from the described examples of the embodiments, as well as from the attached figures.

[0022] FIG. 1 through 3 outline drawings showing the principle of an electric energy storage cell in different operating states;

[0023] FIG. 4 through 6 outline drawings of differently designed embodiments showing the principle of connected contact elements;

[0024] FIG. 7 through 11 contact elements having differently designed heat transfer sections; and

[0025] FIG. 12 an outline drawing, of a motor vehicle according to the invention provided with an energy storage device according to the invention.

[0026] FIG. 1 through 3 show respective outline drawings showing an electric energy storage cell I that is provided with five cell layers 2. Each electrode of the cell layers 2 is in this case provided with a contact element 3. As shown in FIGS. 1 and 2, the contact elements 3 of each electrode run together in each case to an adhesive site 4, which is realized from an electrically conductive adhesive. In FIG. 1 is shown a fault-free, normal operational state, in which each cell layer 2 emits an operating current. If an internal short-circuit 6 is generated after this state in a defective cell layer 9, the state shown in FIG. 2 will be created. A higher heat input is thus caused in the adhesive site 4 by an internal short-circuit 6. In this state, the cell layers 2 also emit a short-circuit current 7, which is added to the summation current 9. The adhesive site 4 is designed in such way that an adhesive-specific temperature limiting value created for the adhesive is exceeded by the heat input. As shown in FIG. 3, in this case, the adhesive site 4, no longer shown in the figure, will at least interrupt the connection with the defective cell layer 9.

[0027] The FIGS. 4 through 6 are outline drawings respective showing the principle of four contact elements 3 connected by adhesive sites 4. In FIG. 4 is shown an embodiment in a longitudinal section, in which two respective elements 3 are connected by an adhesive 4 formed with a point shape. Another embodiment is shown in FIG. 5, in which the four contact elements 3 are connected with a single adhesive site 4. Finally, FIG. 6 shows a top view of a conductor body 10, in which four contact elements 3 are mutually connected by means of an adhesive site 4 in an electrically conductive manner. However, in this example it would be also conceivable to connect all contact elements 3 with a single adhesive site 4. The conductor body 10 is in this case formed from an electrically conductive metal such as copper.

[0028] FIG. 7 through FIG. 11 show respectively a contact element 3 whose free ends are designed to create a heat transfer section 11, wherein FIG. 7 through 10 show lateral views and FIG. 11 shows a top view. In FIG. 7, the heat transfer section 11 is formed with a wavy shape in order to connect a larger surface with the adhesive. As shown in FIG. 8, the same aim is achieved with a helical embodiment of the same heat transfer section 11. FIG. 9 shows an embodiment of a heat transfer section that is similar to FIG. 9; wherein however, the heat transfer section 11 is formed in zigzag fashion. In addition, FIG. 10 shows a heat transfer section 11 wherein a helical configuration is created by rotating the longitudinal axis of the contact element 3. Finally, FIG. 11 shows a top view of a contact element 3 with a plate-like design of a heat transfer section 11 by means of which the base surface of the heat transfer section 11 is wider than that of the contact element 3, All of the embodiments illustrated in FIG. 7 through 11 enable improved transfer of heat in each adhesive site 4 when the heat transfer layers 11 are suitably arranged relative to each other and in the adhesive site 4.

[0029] FIG. 12 finally shows an outline drawing explaining the principle of a motor vehicle 12 that is provided with an electric energy storage device 14 according to the invention. The motor vehicle is equipped with three energy storage cells 1 that can be in this case arranged for example in the rear region of the motor vehicle 12. A electro motor serves here as an energy source for an electromotive drive 13, which is in the present case indicated as being located in the engine compartment of the motor vehicle.