High-voltage energy storage module and method for producing the high-voltage energy storage module

Abstract

A high-voltage energy storage module for supplying a voltage, in particular to a motor vehicle, includes at least two storage cells and at least one electrically conductive connection between two poles of different storage cells. The individual connection consists of multiple adjacently arranged bonding wires, and each bonding wire is secured to the two poles by means of a wire bonding.

Claims

1. A high-voltage energy storage module for supplying voltage, comprising: at least two storage cells; and at least one electrically conductive connection between two poles of different storage cells, wherein the at least one electrically conductive connection comprises a plurality of bonding wires arranged one next to the other, each bonding wire being attached to the two poles via wire bonding.

2. The high-voltage energy storage module according to claim 1, further comprising: a circuit board arranged on the at least two storage cells, the circuit board comprising electronics designed to monitor the storage cells.

3. The high-voltage energy storage module according to claim 2, wherein at least one of the plurality of bonding wires is attached on the circuit board via wire bonding between the two poles of the different storage cells.

4. The high-voltage energy storage module according to claim 2, further comprising: at least one additional bonding wire connecting one of the two poles to the circuit board, the at least one additional bonding wire being attached to the one of the two poles and to the circuit board via wire bonding at respective ends thereof.

5. The high-voltage energy storage module according to claim 3, further comprising: at least one additional bonding wire connecting one of the two poles to the circuit board, the at least one additional bonding wire being attached to the one of the two poles and to the circuit board via wire bonding at respective ends thereof.

6. The high-voltage energy storage module according to claim 3, further comprising: a temperature sensor as at least part of the electronics, the temperature sensor being arranged on the circuit board at an attachment point of the bonding wire to the circuit board, wherein the temperature sensor is designed to determine a temperature of the storage cell passed on via the bonding wire.

7. The high-voltage energy storage module according to claim 4, further comprising: a temperature sensor as at least part of the electronics, the temperature sensor being arranged on the circuit board at an attachment point of the additional bonding wire to the circuit board, wherein the temperature sensor is designed to determine a temperature of the storage cell passed on via the additional bonding wire.

8. The high-voltage energy storage module according to claim 2, wherein all poles of the at least two storage cells are oriented on one side of the high-voltage energy storage module, and the circuit board is configured to rest on said one side.

9. The high-voltage energy storage module according to claim 2, further comprising: a metal element arranged on the circuit board and having a connecting device for a cable; and an electrically conductive connection extending between one pole of a respective storage cell and the metal element, wherein the electrically conductive connection comprises a plurality of bonding wires arranged one next to the other, each bonding wire being attached to the one pole and to the metal element via wire bonding.

10. The high-voltage energy storage module according to claim 9, wherein the metal element is an aluminum panel.

11. The high-voltage energy storage module according to claim 6, further comprising: a metal element arranged on the circuit board and having a connecting device for a cable; and an electrically conductive connection extending between one pole of a respective storage cell and the metal element, wherein the electrically conductive connection comprises a plurality of bonding wires arranged one next to the other, each bonding wire being attached to the one pole and to the metal element via wire bonding.

12. The high-voltage energy storage module according to claim 1, wherein the plurality of bonding wires each have a round cross-section with a maximum diameter of one millimeter.

13. The high-voltage energy storage module according to claim 1, wherein the plurality of bonding wires each have a round cross-section with a maximum diameter of 500 m.

14. The high-voltage energy storage module according to claim 1, wherein the plurality of bonding wires, in aggregate, are ribbon-shaped and have a maximum width of 3 millimeters.

15. The high-voltage energy storage module according to claim 1, wherein the plurality of bonding wires, in aggregate, are ribbon-shaped and have a maximum width of 2 millimeters.

16. The high-voltage energy storage module according to claim 1, wherein the energy storage module is configured for a motor vehicle.

17. A method for producing a high-voltage energy storage module for supplying voltage in a motor vehicle, the method comprising the acts of: providing at least two storage cells; and forming at least one electrically conductive connection between two poles of different ones of the at least two storage cells, wherein the act of forming the at least electrically conductive connection is carried out by wire-bonding a plurality of bonding wires to both of the two poles to form an individual connection.

18. The method according to claim 17, wherein the wire bonding is carried out by applying one of pressure, ultrasound or an increased temperature.

19. The method according to claim 17, further comprising the act of: wire-bonding at least one of the plurality of bonding wires to a circuit board of the high-voltage energy storage module at a location between ends of the at least one bonding wire that are wire bonded to the poles of the different storage cells.

20. The method according to claim 17, further comprising the act of: wire-bonding an additional bonding wire at one end to one pole of a respective storage cell and at another end to a circuit board of the high-voltage energy storage module.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of a high-voltage energy storage module according to the invention in accordance with a first exemplary embodiment;

(2) FIG. 2 is a perspective view of a storage cell of the high-voltage energy storage module according to the invention in accordance with the first exemplary embodiment;

(3) FIG. 3 is a perspective view of a first detail of the high-voltage energy storage module according to invention in accordance with the first exemplary embodiment;

(4) FIG. 4 is a perspective view of a second detail of the high-voltage energy storage module according to invention in accordance with the first exemplary embodiment;

(5) FIG. 5 is a perspective view of the high-voltage energy storage module according to the invention in accordance with a second exemplary embodiment;

(6) FIG. 6 is a perspective view of a detail of the high-voltage energy storage module according to the invention in accordance with the second exemplary embodiment; and

(7) FIG. 7 illustrates production steps for the high-voltage energy storage module of the two exemplary embodiments.

DETAILED DESCRIPTION OF THE DRAWINGS

(8) A first exemplary embodiment of the high-voltage energy storage module 1 is described below with reference to FIGS. 1 to 4. FIGS. 5 and 6 show a second exemplary embodiment of the high-voltage energy storage module 1. FIG. 7 shows method steps for producing the high-voltage energy storage module 1 of the two exemplary embodiments. Identical or functionally identical components are provided with the same reference symbols in all the exemplary embodiments.

(9) According to FIG. 1, the high-voltage energy storage module 1 includes a plurality of storage cells 2. FIG. 2 shows one of the storage cells 2 in detail. The storage cells 2 are of prismatic design and arranged in a row in the high-voltage energy storage module 1. Each storage cell 2 has two poles 4. The storage cells 2 are arranged in a row such that all the poles 4 point to one side. A circuit board 3 is fitted onto this side of the high-voltage energy storage module 1.

(10) The circuit board 3 has a plurality of clips 5 in the first exemplary embodiment. A clip 5 projects in each case between two adjacent poles 4 of different storage cells 2. The circuit board 3 is configured or embodied in such a way that it positions and secures the storage cells 2 with respect to one another.

(11) A connection 6 is arranged in each case between two adjacent poles 4 of different storage cells 2. The connection 6 is electrically conductive and connects the different storage cells 2 to one another in a row connection or a parallel connection.

(12) In order to connect the entire high-voltage energy storage module 1 to a further high-voltage energy storage module 1 or to the high-voltage power supply of a vehicle, a cable 9 is provided. In order to connect this cable 9 to the circuit board 3, a metal element 8 is located on the circuit board 3. On the metal element 8, a connection device 10 is formed, for example for the screwing on of a cable lug of the cable 9. The metal element 8 is connected to one of the poles 4 by way of a connection 7.

(13) FIG. 3 shows a first detail from FIG. 1. The connection 6 is composed of a plurality of bonding wires 11 arranged one next to the other. The bonding wires 11 are arranged, in particular, in parallel with one another and are spaced apart from one another. The bonding wires 11 can also be arranged one on top of the other. Each bonding wire leads from one pole 4 via the circuit board 3 to the adjacent pole 4. Each bonding wire 11 is attached to both poles 4 and to the circuit board 3, and placed in contact therewith, by use of wire bonding. In the example shown, eleven bonding wires 11 are selected for the connection 6. The number of bonding wires 11 is selected in accordance with the cross section of the individual bonding wires 11 and the maximum current.

(14) Furthermore, FIG. 3 shows the connection 7. The connection 7 also consists of individual bonding wires 11. The bonding wires 11 are arranged one next to the other, in particular parallel to one another. Each bonding wire is connected to the metal element 8 and the pole 4 by use of wire bonding.

(15) FIG. 4 shows a second detail from FIG. 1. The point at which the individual bonding wires 11 of the connection 6 are connected to the circuit board 3 is referred to as the attachment point 13. In the vicinity of this attachment point 13 there is a temperature sensor 14 on the circuit board 3. The bonding wires 11 conduct the temperature of the pole 4, and therefore of the storage cell 2, to the circuit board 3. On the circuit board 3, a corresponding temperature can be detected with the temperature sensor 14. Any phase shifts or temperature losses between the temperature sensor 14 and the storage cell 2 are compensated by a corresponding calculation model. For this purpose, the temperature sensor 14 is connected to a CPU 15 on the circuit board 3. The CPU 15 and the temperature sensor 14 are generally electronics by which the individual storage cells 2 can be monitored. For example, the cell voltage in the individual cell 2 can also be measured with the CPU 15 via the attachment point 13.

(16) FIGS. 5 and 6 show a second exemplary embodiment of the high-voltage energy storage module 1. In contrast to the first exemplary embodiment, in the second exemplary embodiment there is provision that the bonding wires 11 of the connection 6 run directly from one pole 4 to the adjacent pole 4. In this context, the attachment point 13 between the two poles 4 is eliminated. As a result, the poles 4 can be located closer to one another. An additional bonding wire 12, which is attached by one end to the pole 4 and by the other end to the circuit board 3, is provided on each storage cell 2 for the measurement current. The attachment of the additional bonding wire 12 is in turn carried out by way of wire bonding. In particular, at least one additional bonding wire 12 is used per storage cell 2 or per pole 4. The connecting point of the additional bonding wire 12 on the circuit board 3 again forms an attachment point 13 via which, for example, the temperature and/or the cell voltage can be measured.

(17) FIG. 7 shows steps S1 to S4 for producing the high-voltage energy storage modules 1 of both exemplary embodiments. For example, the wire bonding of the bonding wires 11 between two adjacent poles 4 is shown.

(18) FIG. 7 shows in step S1 that the bonding wire 11 is guided through a capillary or feed device 16. The end of the bonding wire 11 is firstly positioned on a pole 4. According to S2, an ultrasonic vibration 18 is then applied to the bonding wire 11 and/or to the capillary 16. At the same time, a bonding force 17 is applied, with the result that the bonding wire 11 is connected to the pole 4. After this, the capillary 16 is guided to the adjacent pole 4 according to step S3. Through the movement of the capillary 16, the bonding wire 11 is simultaneously bent into the correct shape. According to step S3, the bonding force 17 and the ultrasonic vibration 18 are in turn applied, with the result that the bonding wire 11 is also connected to the next pole 4. According to step S4, a corresponding movement of the capillaries 16 finally takes place with the result that the bonding wire 11 is disconnected.

(19) In the embodiment of the connection 6 in accordance with the first exemplary embodiment, the capillary 16 is positioned with the bonding wire 11 between the steps S2 and S3 on the circuit board 3. In this context, the ultrasonic vibration 18 and the bonding force 17 are also applied to the circuit board 3. However, the bonding wire 17 is preferably not cut off directly after the connection to the circuit board 3 but instead the connection between the bonding wire 11 and the next pole 4 takes place in accordance with step S4. As a result, in the first exemplary embodiment a continuous bonding wire 11 leads from one pole 4 via the circuit board 3 to the next pole 4. The circuit board 3 therefore does not have to conduct the main current, for example at a level of 200 A.

LIST OF REFERENCE NUMERALS

(20) 1 High-voltage energy storage module 2 Storage cells 3 Circuit board 4 Poles 5 Clips 6 Connections 7 Connection 8 Metal element 9 Cable 10 Connecting device 11 Bonding wires 12 Additional bonding wires 13 Attachment point 14 Temperature sensor 15 CPU 16 Capillary 17 Bonding force 18 Ultrasound

(21) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.