WO2013092063A1

WO2013092063A1 - Battery arrangement, battery and production method

Info

Publication number: WO2013092063A1
Application number: PCT/EP2012/073035
Authority: WO
Inventors: Martin Kessler; Volker Doege; Andy Tiefenbach; Alexander Schmidt
Original assignee: Robert Bosch Gmbh
Priority date: 2011-12-22
Filing date: 2012-11-20
Publication date: 2013-06-27
Also published as: DE102011089665A1

Abstract

The present invention discloses a battery arrangement (1), in particular for a high-voltage battery for a motor vehicle, comprising at least one cell winding stack (2), which has at least one cathode (3) and one anode (4), comprising at least one first outgoing electrical conductor (5) for a respective cell winding stack, wherein this first outgoing electrical conductor is coupled to the cathode and has a flat contact face (6), comprising at least one second outgoing electrical conductor (7) for a respective cell winding stack, wherein said second outgoing electrical conductor is coupled to the anode and has a flat contact face (8), comprising a first busbar (10), which is coupled to the flat contact face of the first outgoing electrical conductors, and comprising a second busbar (11), which is coupled to the flat contact face of the second outgoing electrical conductors. In addition, the present invention discloses a battery and a production method.

Description

Description title

Battery assembly, battery and manufacturing process

The present invention relates to a battery assembly, in particular for a high-voltage battery for a motor vehicle, a battery, in particular a high-voltage battery for a motor vehicle, and a manufacturing method for a battery assembly.

State of the art

Although the subject matter of the present invention may be used in a variety of applications in which electrical energy is stored, it will be described below in conjunction with hybrid and / or electric vehicles.

In the development of modern motor vehicles, the reduction of fuel consumption and thus of pollutant emissions is one of the most important criteria for the

Development engineer. In addition to reducing the weight of a motor vehicle, different drive types are combined in modern motor vehicles in order to further reduce the fuel consumption of a motor vehicle.

One possibility is to use an internal combustion engine, e.g. in hybrid vehicles, supplemented by an electric motor. Furthermore, in electric vehicles of

Internal combustion engine not only supported by an electric motor but replaced by the electric motor.

In order to operate an electric motor in a motor vehicle is a

Energy storage necessary. Such energy storage, such as a high-voltage battery, provides the electrical energy that is necessary to drive the electric motor and stores energy, which is obtained by the electric motor in the generator mode, for example when the vehicle brakes. High-voltage batteries usually consist of individual electrochemical energy storage cells, which can be electrically connected in series or in parallel. Such an energy store for hybrid or electric vehicles is shown for example in DE 102010028191 (A1).

Usual energy storage cells each have at least one cell winding package whose cathode and anode are each contacted by means of a connecting wire, also called tab.

DISCLOSURE OF THE INVENTION The present invention discloses a battery assembly having the features of claim 1, a battery having the features of claim 9, and a manufacturing method for a battery assembly having the features of claim 10.

Accordingly, it is provided:

A battery assembly, in particular for a high-voltage battery for a motor vehicle, having at least one cell winding package, which has at least one cathode and one anode, with at least one first current conductor for a respective cell winding packet, said first current conductor is coupled to the cathode and a flat

having a trained contact surface, with at least one second current conductor for a respective cell winding package, said second current collector is coupled to the anode and having a flat contact surface formed, and having a first bus bar, which with the flat contact surface of the first

Current conductor is coupled, and with a second bus bar, which is coupled to the flat contact surface of the second current collector.

A battery, in particular high-voltage battery for a motor vehicle, with a

A battery housing, comprising at least one battery assembly according to the invention, which is arranged in the battery housing, with a positive battery terminal which is coupled to a first bus bar of the battery assembly, and a negative battery terminal, which is coupled to a second bus bar, the battery assembly.

A manufacturing method for a battery assembly, in particular for a high-voltage battery for a motor vehicle, comprising the steps of arranging at least one cathode and one anode into a cell winding package, coupling a first current conductor, which comprises a having a flat formed contact surface, with the cathode, coupling a second current collector, which has a flat contact surface, with the anode, coupling a first bus bar with the area formed contact surface of the first Stromableiters, and coupling a second busbar with the flat contact surface of the second current conductor.

ADVANTAGES OF THE INVENTION The finding underlying the present invention is that the inductance, which is a battery, in particular a high-voltage battery for a

Motor vehicle, depending on the geometry of the Zellwickelpakete and their connections. The idea underlying the present invention now consists of this

Recognize knowledge and provide a battery assembly, in which the distances covered by the electrical current and the areas enclosed by these distances surfaces are minimized. If battery arrangements according to the invention are used, in addition to the low inductance, a low DC resistance also results.

The lower inductance and the lower DC resistance allow a reduction in the loss energy in switches or switching devices which are coupled to the battery assembly. Furthermore, the efficiency of the electrical system which is coupled to the battery assembly increases. Finally, electromagnetic emissions and DC losses are reduced.

Advantageous embodiments and developments emerge from the

Subclaims and from the description with reference to the figures.

In one embodiment, the cathode and the anode and the first current collector and the second current collector are formed as films. Further, the cell winding package has an insulating film and a separator film, and has the first current collector, the cathode, the separator film, the anode, the second current collector, and the insulating film therein Order stacked and wrapped up. This makes it possible to provide a stable battery assembly with a compact design.

In one embodiment, a battery arrangement has at least two cell winding packages, the battery arrangement being designed such that the contact area of the first current conductor and the contact area of the second current conductor of the cell winding packages are electrically coupled to the busbars in the same pole. The parallel connection of several battery arrangements makes it possible to easily increase the energy content of electrical energy which the battery arrangement has.

In one embodiment, a battery arrangement has at least two cell winding packages, the battery arrangement being designed such that the contact area of the first current conductor and the contact area of the second current conductor of at least two cell winding packages are electrically coupled to the busbars in opposite polarity. Furthermore, at least one busbar between the electrically opposite pole with the

Busbars coupled contact surfaces electrically interrupted. As a result, at least two Zellwickelpakete be connected in series. This allows the

Adjust output voltage of a battery assembly to different embodiments.

In a further embodiment, a battery arrangement has at least two cell winding packages, wherein the contact surface of the first current conductor and the

Contact surface of the second Stromableiters of at least two Zellwickelpaketen electrically opposite polarity are coupled to the busbars and has the

Battery assembly additionally at least two more Zellwickelpakete, wherein the contact surface of the first Stromableiters and the contact surface of the second Stromableiters the other Zellwickelpakete are electrically gleichpolig coupled to the busbars. This makes it possible, both the energy content, and the

Adjust output voltage of the battery assembly to different requirements and conditions of use.

In one embodiment, the cell winding package has an elliptical or a semicircle connected with two sides, rectangular cross section. Furthermore, the first current collector and the second current collector are designed such that they extend over the entire length of the main axis of the elliptical cross section of the Zellwickelpakets each protrude on opposite sides of the cell wrapping package across the width of the cell wrapping package, the contact surfaces of the current conductor bent at right angles at the same end of the respective

Stromableiters are formed. This makes it possible to arrange the busbars very close together and thus to reduce the inductance of both the current collector and the busbars.

In one embodiment, the cell winding package has an elliptical or a semicircle connected with two sides, rectangular cross section. Furthermore, the first current collector and the contact surface of the first current collector and the second current collector and the contact surface of the second current collector are as foils of the

Cell winding packages are formed, wherein the contact surfaces of the current conductors are formed as unwound from the cell winding package foil sections. This makes it possible to arrange the busbars very close together and thus to reduce the inductance of both the current collector and the busbars. Furthermore, a very simple construction of the cell wrapping package is made possible, since no separate contact surfaces have to be provided.

In one embodiment, the cell winding package has an elliptical or a semicircle connected with two sides, rectangular cross section. Furthermore, the first current collector and the second current collector are designed such that they extend over the entire length of the main axis of the elliptical cross section of the

Zellwickelpakets each protrude on opposite sides of the cell wrapping package across the width of the cell wrapping package, wherein the contact surfaces of the current collector bent at right angles to the respective same end of the corresponding

Stromableiters are formed and wherein the width of the busbars corresponds to the width of the Zwollwickelpakets and the busbars are arranged one above the other lying below the Zellwickelpaket, and wherein, depending on whether the first

Busbar over the second busbar or the second busbar is disposed above the first busbar, the first current conductor shorter than the second

Current conductor or the second current collector shorter than the first current collector is formed. This makes it possible to arrange the busbars very close together and thus to reduce the inductance of both the current collector and the busbars. In this arrangement, the bus bars may have an enlarged cross-section, thereby further reducing the DC resistance of the bus bars. In one embodiment, the cell winding package has an elliptical or a semicircle connected with two sides, rectangular cross section. Furthermore, the first current collector and the contact surface of the first current collector and the second current collector and the contact surface of the second current collector are as foils of the

Zwellwickelpakets formed, wherein the bus bars are formed as voltage applied to side surfaces of the Zellwickelpakets busbars, and wherein the

Contact surfaces of the current collector are designed as laterally formed on the cell winding package tabs. This makes it possible to place the cell winding packages very close together, thus providing a very compact battery arrangement.

The above embodiments and developments can, if appropriate, combine with each other as desired. Further possible refinements, developments and implementations of the invention also include combinations which have not been explicitly cited and which are described above or below with regard to the exemplary embodiments

Features of the invention. In particular, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the present invention.

Brief description of the drawings

The present invention will be explained in more detail with reference to the exemplary embodiments indicated in the schematic figures of the drawings. 1 shows a schematic representation of an embodiment of a

battery assembly 1 according to the invention;

Fig. 2 is a side view of an embodiment of an inventive

Cell wrapping packages 2;

Fig. 3 is a schematic representation of another embodiment of a

battery assembly 1 according to the invention;

Fig. 4 is a schematic representation of another embodiment

battery assembly 1 according to the invention; Fig. 5 is a schematic representation of another embodiment of a battery assembly 1 according to the invention;

6 is a block diagram of an embodiment of a battery according to the invention

14;

7 is a flowchart of a manufacturing method according to the invention.

In all figures, the same or functionally identical elements and devices - unless otherwise stated - have been given the same reference numerals.

EMBODIMENTS OF THE INVENTION FIG. 1 shows a schematic representation of an embodiment of a

Inventive battery assembly 1.

The battery arrangement 1 in FIG. 1 has a cell winding package 2 which has an elliptical or a semicircle connected with two sides, of rectangular cross section, in which the ratio of the main axis to the minor axis is approximately 5: 1. In this case, the main axis of the elliptical cross-section in Fig. 1 forms the

The vertical axis of the cell wrapping package 2. Further, the cell winding package 2 in Fig. 1 is about twice as high as it is wide. The individual layers of the cell wrapping package 2 are stacked and wound around an axis through the center of the elliptical cross section, so that the individual layers are visible in a side view of each side of the cell wrapping package.

The cell winding package 2 has, on the left side, a first current conductor 5, which in one embodiment is electrically coupled to a current collector film applied to the cathode 3. In a further embodiment, the first current conductor 5 is formed integrally with the current collector foil of the cathode 3.

On the right side, the cell winding package 2 has a second current collector 7, which in one embodiment is electrically coupled to a current collector foil applied to the anode 4. In a further embodiment, the second current conductor 7 is formed integrally with the current collector foil of the anode 4. The current conductors 5 and 7 each extend over the entire length of the main axis of the elliptical cross section of the cell winding package 2. At the lower end of the cell winding package 2, the current conductors 4, 5 each have a contact surface 6, 8, which in a plane perpendicular to the respective current conductor 4, 5 extends in the direction of the center under the cell winding package 2. This extends the

Contact surface 6 of the first Stromableiters 5 only over a width of a first busbar 10. The contact surface 8 of the second Stromableiters 7, however, extends beyond the midpoint under the Zellwickelpaket out to the contact surface 6 of the first Stromableiters 5, but without touching them. A first bus bar 10, which is electrically coupled to the contact surface 6 and which is marked with a "+", extends under the contact surfaces 6 of the first current conductor 5. Underneath the contact surfaces 8 of the second current conductor 7 extends a second bus bar 11 which extends is electrically coupled to the contact surface 8 and which is marked with a "-".

In further embodiments, in particular, the cell winding package 2 has a geometry deviating from the cell winding package 2 in FIG. 1. For example, that can

Zellwickelpaket 2 have a different aspect ratio or different outer dimensions.

Fig. 2 shows a side view of an embodiment of an inventive

Zellwickelpakets 2. The cell winding package 2 in Fig. 2, the first current collector 5, the cathode 3, the

Separator film 12, the anode 4, the second current collector 7 and the insulator film 13 stacked in this order and wound on.

In an alternative embodiment, the cell winding package 2 has the first one

Current conductor 5, the cathode 3, the separator film 12, the anode 4, the second

Current collector 7, a second second current collector 7, a second anode 4, a second separator foil 12, a second cathode 3 and a second first current conductor 5 are stacked and wound in this order. In yet another embodiment, the cell wrapper has the

Zellwickelpaket 2 the second current collector 7, the anode 4, the separator film 12, the Cathode 3, the first current collector 5, a second first current collector 5, the cathode 3, a second separator foil 12, a second anode 4 and a second second

Current conductor 7, stacked in this order and wound on. As a result, that part of the weight or volume of the battery arrangement 1 which has charge storage of the material is increased.

In Fig. 2 is merely shown that the layers are folded up once and then once wound from top to bottom. In further embodiments, a cell winding package 2 has a plurality of turns. The number of turns is at least of the available space and of the for the

Battery arrangement 1 specified energy content dependent.

FIG. 3 shows a schematic representation of a further embodiment of a battery arrangement 1 according to the invention.

FIG. 3 has a cell winding package 2, which corresponds to the cell winding package 2 of FIG. 1, but in which the current conductors 5, 7 are integrated into the cell winding package 2 as current collector foils 5, 7. Further, in the cell winding package 2 in FIG. 3, an additional one

Insulation layer 13b arranged at the end of the cell coil 2. In Fig. 3 forms as well as in Fig. 1, the major axis of the elliptical cross section, the vertical axis of the

Cell winding packages 2.

The cell winding package 2 has no separate current conductors 5, 7 or contact surfaces 6, 8. Rather, the contact surfaces 6, 8 as part of the Stromableiterfolien 5, 7 are formed. In order to contact the Stromableiterfolien 5, 7 with the busbars 10, 1 1 electrically, the end of the cell winding package 2 is unwound such that the unwound end on the busbars 10 and 1 1 comes to rest. In order to be able to contact the first current conductor 5 with the first busbar 10, the foils which are between the first current conductor 5 and the first

Busbar 10 are cut out such that the first current conductor 5 rests directly on the first busbar 10. Only the area of the foils will be affected

cut out, which directly between the current collector 5 and the first

Busbar 10 is located. By inserting the additional insulation layer 13b at the winding end, it is ensured that cathode 3 and anode 4 are electrically insulated. In an analogous manner, the films which lie between the second current collector 7 and the second busbar 1 1, cut out such that the second current collector 7 rests directly on the second busbar 1 1.

The battery arrangement 1 shown in FIG. 3 makes it possible to easily connect cell winding packages to the conductor rails 10, 11.

4 shows a schematic illustration of a further embodiment of a battery arrangement 1 according to the invention.

FIG. 4 has a cell winding package 2, which corresponds to the cell winding package 2 of FIG. 1. Furthermore, FIG. 4 has current conductors 5, 7, which, just as in FIG. 1, are arranged laterally on the cell winding package 2.

In contrast to FIG. 1, however, the contact surfaces 6, 8 of the current conductors 5, 7 are not arranged on a common plane. 4, the bus bars 10, 1 1 are formed such that they extend over the entire width of the cell winding package 2. Furthermore, the busbars 10, 1 1 are arranged below one another under the cell winding package, wherein the first busbar 10 is arranged above the second busbar 11. Furthermore, in one embodiment, an insulating layer (not shown in FIG. 4) is arranged between the busbars 10, 11, in order to avoid a short circuit between the busbars 10, 11. For electrical contacting of the contact surfaces 6, 8 of the current conductors 5, 7, the current conductors 5, 7 are formed differently long. The contact surfaces 6, 8 extend over the entire width of the cell winding package 2. The contact surface 6 of the first current conductor 5 extends directly under the cell winding package 2 over the entire width of the cell winding package 2 and contacts the first busbar 10. The second

Current conductor 7 is formed so long that the contact surface 8 of the second

Stromableiters is arranged under the first bus bar 10 to the second

Contact rail 1 1.

FIG. 5 shows a schematic illustration of a further embodiment of a battery arrangement 1 according to the invention. The battery assembly 1 in Fig. 5, a cell winding package 2, which the

Cell winding package 2 of FIG. 1 corresponds. In contrast to Fig. 1, the

Battery assembly 1 in Fig. 5 no current conductors 5, 7 on. The current conductors 5, 7 are formed in FIG. 5 as current drainage foils 5, 7 and integrated in the cell winding package 2. The contact surfaces 6, 8 of the Stromabieiterfolien 5, 7 are formed as tabs 6, 8, which are attached to each side of the cell winding package 2 to contact the busbars 10, 1 1. In order to allow electrical contact of the bus bars 10, 1 1 with the tabs 6, 8, the bus bars 10, 1 1 on the sides of

Zellwickelpakets 2 arranged adjacent.

6 shows a block diagram of an embodiment of a battery 14 according to the invention.

The battery 14 has a battery housing 15, which at least one

Battery assembly 1 has. In Fig. 6 further possible battery arrangements 1 are represented by three dots. Furthermore, the battery 14 in FIG. 6 has a positive battery terminal 16 and a negative battery terminal 17, which are coupled to the battery arrangements 1. Fig. 7 shows a flow chart of a manufacturing method according to the invention.

In a first step S1 of the embodiment of the method, a first

Current conductor 5, which has a flat contact surface 6, coupled to a cathode 3. In a second step S2, a second current collector 7, which has a flat contact surface 8, is coupled to the anode 4. In a third step S3, at least the cathode 3, the anode 4, a separator foil 12 and the current conductors 5, 7 are arranged to form a cell winding package 2. In a fourth step S4, a first busbar 10 is formed with the planar

Contact surface 6 of the first Stromableiters 5 coupled and in a fifth step S5, a second busbar 1 1 is coupled to the flat contact surface 8 of the second Stromableiters 7.

Although the present invention has been described above with reference to preferred embodiments, it is not limited thereto, but modifiable in a variety of ways. In particular, the invention can be varied or modified in many ways without deviating from the gist of the invention. In one embodiment, the contact surfaces 6, 8 can be electrically and mechanically coupled to the bus bars 10, 11 by spot welding. In further embodiments, the contact surfaces 6, 8 with the busbars 10, 1 1 by electrically conductive adhesive, by soldering or the like can be electrically and mechanically coupled.

Claims

Claims 1. Battery arrangement (1), in particular for a high-voltage battery for a

Motor vehicle, with at least one Zellwickelpaket (2), which has at least one cathode (3) and an anode (4); with at least one first current conductor (5) for a respective cell winding package (2) which is coupled to the cathode (3) and which has a planar design

Contact surface (6) has; with at least one second current conductor (7) for a respective cell winding packet (2), which is coupled to the anode (4), and which has a planar design

Contact surface (8) has; with a first busbar (10), which is coupled to the flat contact surface (6) of the first current collector (5); with a second busbar (1 1), which is coupled to the flat contact surface (8) of the second current collector (7).

2. Battery arrangement according to claim 1,

characterized in that the cathode (3) and the anode (4) and the first current conductor (5) and the second current conductor (6) are formed as films, and the cell winding package (2) further comprises a separator film (12) and a Insulating film (13); and wherein the cell winding package (2) includes the first current collector (5), the cathode (3), the separator film (12), the anode (4), the second current collector (7), and the insulating film (13) therein Sequence stacked and wrapped has; or wherein the cell winding package (2) comprises the first current collector (5), the cathode (3), the separator film (12), the anode (4), the second current collector (7), a second second

Current conductor (7), a second anode (4), a second separator film (12), a second cathode (3) and a second first current collector (5).

3. Battery arrangement according to one of claims 1 and 2,

characterized in that a battery assembly (1) has at least two cell winding packages (2); the battery arrangement (1) being designed such that the contact surface (6) of the first current conductor (5) and the contact surface (8) of the second current conductor (7) of the cell winding packages (2) are electrically homopolar with the conductor rails (10, 11) are coupled.

4. Battery arrangement according to one of claims 1 and 2,

characterized in that

a battery arrangement (1) has at least two cell winding packages (2); wherein the battery arrangement (1) is designed such that the contact surface (6) of the first current conductor (5) and the contact surface (8) of the second current conductor (7) of at least two cell winding packages (2) are electrically opposite in polarity to the conductor rails (10, 1 1) are coupled; and wherein at least one bus bar (10, 1 1) between the electrically opposite pole with the busbars (10, 1 1) coupled to the contact surfaces (6, 8) is electrically interrupted.

5. Battery arrangement according to one of the preceding claims 1 to 4,

characterized in that the cell winding package (2) has an elliptical or a half-circles connected with two sides, rectangular in cross-section; and that the first current collector (5) and the second current collector (7) are formed so that they over the entire length of the major axis of the elliptical Extending cross section of the cell wrapping package (2) respectively on opposite sides of the cell wrapping package (2) across the width of the cell wrapping package (2); wherein the contact surfaces (6, 8) of the current conductors (5, 7) angled at right angles to the respective same end of the corresponding Stromableiters (5, 7) are formed.

6. Battery arrangement according to one of the preceding claims 1 to 4,

characterized in that the cell winding package (2) has an elliptical or a half-circles connected with two sides, rectangular in cross-section; and that the first current conductor (5) and the contact surface (6) of the first current collector (5) and the second current collector (7) and the contact surface (8) of the second current collector (7) are formed as films of the cell winding package (2); wherein the contact surfaces (6, 8) of the current conductors (5, 7) are formed as foil sections unwound from the cell winding package (2).

7. Battery arrangement according to one of the preceding claims 1 to 4,

characterized in that the cell winding package (2) has an elliptical or a half-circles connected with two sides, rectangular in cross-section; and that the first current conductor (5) and the second current collector (7) are formed such that they are formed over the entire length of the major axis of the elliptical

Extending cross section of the cell wrapping package (2) respectively on opposite sides of the cell wrapping package (2) across the width of the cell wrapping package (2); wherein the contact surfaces (6, 8) of the current conductors (5, 7) are angled at right angles to the respective same end of the corresponding current conductor (5, 7); wherein the width of the bus bars (10, 1 1) corresponds to the width of the Zwollwickelpakets (2), and the bus bars (10, 1 1) lying one above the other under the

Cell winding package (2) are arranged; and wherein, depending on whether the first bus bar (10) over the second

Busbar (1 1) or the second busbar (1 1) over the first busbar (10) is arranged, the first current conductor (5) shorter than the second current collector (6) or the second current collector (6) shorter than the first current collector (5) is formed.

8. Battery arrangement according to one of the preceding claims 1 to 4,

characterized in that the cell winding package (2) has an elliptical or a half-circles connected with two sides, rectangular in cross-section; and in that the first current conductor (5) and the contact surface (6) of the first current conductor (5) and the second current conductor (7) and the contact surface (8) of the second current conductor (7) are formed as films of the Zwollwickelpakets (2); wherein the bus bars (10, 1 1) as on side surfaces of the cell winding package (2) adjacent busbars (10, 1 1) are formed; and wherein the contact surfaces (6, 8) of the current conductors (5, 7) are designed as lugs (6, 8) formed laterally on the cell winding package (2).

9. Battery, in particular high-voltage battery for a motor vehicle, with a battery housing (15); with at least one battery assembly (1) according to one of the preceding claims, which is arranged in the battery case (15); a positive battery terminal (16) coupled to a first bus bar (10) of the battery assembly (1); and with a negative battery terminal (17) which is coupled to a second bus bar (1 1), the battery assembly (1).

10. Manufacturing method for a battery assembly (1), in particular for a

High-voltage battery for a motor vehicle, with the following steps:

Coupling (S1) of a first current conductor (5), which has a flat design

Contact surface (6), with a cathode (3);

Coupling (S2) of a second current collector (7), which has a flat design

Contact surface (8), with an anode (4); and arranging (S3) at least the cathode (3), the anode (4), a separator foil (12) and the current conductor (5, 7) to form a cell winding package (2);

Coupling (S4) a first busbar (10) to the areally formed contact surface (6) of the first current conductor (5);

Coupling (S5) a second busbar (1 1) with the flat contact surface (8) of the second current collector (7).