WO2018233930A1

WO2018233930A1 - Battery cell

Info

Publication number: WO2018233930A1
Application number: PCT/EP2018/062430
Authority: WO
Inventors: Paulo DE ANDRADE RUIZ; Markus Kohlberger; Markus Neumann; Thomas Kuemmel
Original assignee: Robert Bosch Gmbh
Priority date: 2017-06-20
Filing date: 2018-05-15
Publication date: 2018-12-27
Also published as: CN110785870B; CN110785870A; DE102017210259A1

Abstract

The present invention relates to a battery cell, comprising an electrode arrangement having at least one arrester (26) for contacting active material and a collector (28) for externally contacting the electrode arrangement, wherein the battery cell also comprises at least one rivet (10), and wherein the collector (28) and the arrester (26) each comprise at least one opening (27, 29), wherein the opening (27) of the collector (28) and the opening (29) of the arrester (26) are positioned at least partially in alignment with one another, and wherein the rivet (10) runs through the opening (29) in the arrester (26) and the opening (27) in the collector (28) and fixes the arrester (26) to the collector (28).

Description

Description title

battery cell

The present invention relates to a battery cell with improved manufacturability.

State of the art

It is becoming increasingly apparent that both in stationary applications, such as in wind power plants, in mobile applications, such as in vehicles, for example hybrid or electric vehicles, and in the consumer sector, such as laptops and mobile telephones, there are more and more new ones Battery systems are used, which must meet very high requirements. Such requirements include, for example, high reliability, performance and lifetime. An important parameter for performance is the specific energy. It is measured in watt-hours per kilogram (Wh / kg) and indicates how much energy can be stored in one kilogram of battery. It is therefore an effort to reduce the weight of the batteries to increase this value.

Traction batteries in hybrid, plug-in hybrid and electric vehicles are usually modular in design. In this case, modules are formed from at least two individual cells, which are connected in series or in parallel, which in turn are combined to form larger subunits, the so-called subunits. Such subunits often share a common cooling device. The battery is then made up of two or more of these subunits. The subunits can be arranged one above the other depending on the installation space in several levels. KR 101327767 describes a battery in which the terminal areas of a positive electrode plate with the terminal areas of a negative electrode

Electrode plate is connected by one rivet each.

Disclosure of the invention

The present invention relates to a battery cell comprising a

Electrode arrangement with at least one Abieiter for contacting active material and a collector for external contacting the

An electrode assembly, wherein the battery cell further comprises at least one rivet, and wherein the collector and Abieiter each having at least one opening, wherein the opening of the collector and the opening of the Abieiters are at least partially aligned with each other, and wherein through the opening of the Abieiters and The opening of the collector of the rivet runs, which fixes the Abieiter with the collector.

A battery cell described above enables a particularly advantageous contacting of the at least one Abieiters with a collector and also allows in a simple way interconnection of several

Battery cells of a battery module.

Such a battery cell thus has at least one electrode arrangement with a drain for contacting active material. In particular, the battery cell has a plurality of electrode arrangements, each having a drain contacted with one or more layers of active material. Thus, the battery cell in particular a plurality of electrode assemblies also referred to as electrode ensembles and thus a plurality of Abieitern on.

The electrode arrangements can in principle be designed as they are basically known. In particular, active materials may be present, as are known for the production of lithium-ion battery cells. Furthermore, the electrode arrangement comprises a collector to the external

Contacting the at least one electrode assembly. The collector thus serves to make the Abieiter or in particular for an external contact accessible and also in particular when a plurality of

Abieitern exists, the plurality of Abieitern electrically to each other

boarded.

In the above-described battery cell, it is further provided that the collector and Abieiter or the plurality of Abieitern have at least one opening, wherein the opening of the collector and the opening of the Abieiters or Abieiter are at least partially aligned. Thus, the collector and the collector (s) have a common passageway formed through the openings.

It is provided that this passageway or the openings are used to a rivet passes through the openings or through the passageway. The rivet serves to mechanically fix the Abieiter or in particular the plurality of Abieitern to the connector and also optionally to connect the Abieiter at least partially electrically.

A rivet may be provided or a plurality of rivets may be provided to connect the collector (s) to the collector. The number of rivets may depend on the size of the battery cell.

For example, two to six rivets can be used.

Such attachment of the Abieiter or, preferably, the Abieiter to the collector using a rivet can offer significant advantages over the prior art solutions.

Because by the use of a rivet can on the provision of a

Welded connection for connecting the Abieiters or Abieiter be dispensed with the collector. This has advantages in terms of the first Manufacturing process, since the periphery, which is necessary for the formation of a welded joint, can be dispensed with.

In addition, so no splashes that can often not be completely prevented during a welding process. As a result, the risk of damage resulting from this can be reduced or eliminated.

Schließich can be on a heat application, as this is basically necessary in a welding process, waived. As a result, a particularly gentle production process can be made possible.

Finally, a rivet can provide a secure connection between the connector and the Abieiter or Abieitern, which can have a positive effect on the long-term stability.

Particularly preferably, it can be provided that the Abieiter is designed like a film and that the collector is designed to be rigid. In particular, in this embodiment, a particularly high performance of the battery can be made possible, since a folded electrode configuration can be made possible. In addition, the Abieiter can have a comparatively small thickness, so that a plurality of Abieitern have a small thickness and thus can allow a high performance at low weight. In addition, the fact that the collector is rigid, a mechanically stable electrical external connection of the electrode assemblies can be made possible.

The difference between a film-like configuration and a rigid configuration can be seen in the fact that in fixing a film of only one area, a non-fixed area tends to be bent by gravity, which is not the case with a rigid embodiment.

For example, the collector may be configured as a metal sheet in order to combine a good electrical conductivity with a high stability. The Abieiter such as the arrester foil can be chosen depending on the polarity in the battery cell. For example, the Abieiter or Abieiter may be made of copper, when the Abieiter or the

Electrode arrangement is connected as an anode. Alternatively, the Abieiter or Abieiter may be made of aluminum, when the Abieiter or the electrode assembly is connected as a cathode.

It may further be provided that one or a plurality of Abieitern each on opposite sides of the collector or on the

Opening of the collector are present and thus connected to the collector.

It may also be preferred that the rivet has at least one head part with a roughened fixing surface. In this case, a fixing surface may, in particular, be understood as meaning an area of this type which acts or presses on the components to be fixed. In particular, one is

Fixieroberfläche such a surface, which is present at a head of the rivet and is directed towards the components to be connected. Under a roughened surface can be understood in particular that the

Fixing surface has a greater roughness than at least one more

Surface of the rivet, in particular as all other surfaces of the rivet. For example, the fixing surface may be wavy or serrated. This embodiment can form a mechanically particularly stable connection, so that a high long-term stability is given. In addition, there can be a safe and effective electrical contact, which is an advantage for effective and efficient working of the battery cell. Furthermore, this can be advantageous for an interconnection of the electrode arrangements, as will be described below.

It may also be provided that the collector is roughened, ie

especially at the position of the rivet or around the opening, has a roughened surface. This can be a particularly safe

be formed mechanical connection. Both the collector and the rivet can be roughened using a laser.

It may further be preferred that the rivet is a Bimetallniet. In the context of the present invention, a bimetallic rivet can be understood in particular as meaning a rivet which is constructed from two metals. In particular a

Bimetallic Rivet may combine a particularly preferred fixation of one or more Abieiter on a connector, as described above, with a simple and effective interconnection of various

Electrode arrangements. In particular, one or a plurality of, for example, parallel-connected electrode arrangements of positive polarity can be connected in series with one or a plurality of electrode systems of negative polarity connected in parallel.

In particular, but not limited to such an application, provision may be made for the rivet, in particular the bimetallic rivet, to have a first head part, a second head part and a shaft connecting the first head part and the second head part, wherein the first head part consists of a first metal part Material is formed and wherein the second head part is formed from a second metallic material. It may be provided that a boundary region between the first metallic material and the second metallic material is present in the shaft, for example runs centrally between the first head part and the second head part and / or extends in the radial direction.

In this refinement, for example, the first head part can fix anodic Abieiter to an anode collector and the second head part can fix cathodic Abieiter to a cathode collector. For this purpose, for example, two collectors may be parallel to each other and touching each other. Alternatively, the collector may be formed by a bimetallic collector. Due to the different materials of Bimetallniets and

if appropriate, of the bimetallic collector or of the different collectors, these can each have the same material, for example the Abieiter. As a result, a serial connection can be particularly effective and no or have only negligible line losses. This can thus support or enable high performance.

It can thus be provided that the first head part fixes at least one anode conductor to an anode collector and that the second head part fixes at least one cathode conductor to a cathode collector, in particular wherein the anode collector and the cathode collector are designed as a common bimetallic collector

It may further be preferred that the first metallic material comprises aluminum and that the second metallic material is selected from the group consisting of copper, nickel-plated copper and hilumin. Aluminum may be advantageous for a cathode, whereas copper, nickel-plated copper and hilumin may be advantageous for an anode. Especially in this

Embodiment, an advantageous interconnection of the electrode arrangements are advantageously made possible, since they have a good electrical conductivity and are stable for the corresponding poles. Furthermore, these metallic compounds have a high mechanical stability, so that the Bimetallniet can enable a mechanically stable fixation.

Under Hilumin can be understood in particular nickel-coated steel. In particular, nickel-coated steel can be a high

Corrosion resistance and a low contact resistance allow.

For example, there may thus be a Bimetallniet having a first head portion made of aluminum, which is in contact with one or more Abieitern of aluminum and presses against a made of aluminum collector, such as bimetallic collector, wherein on the opposite side, a second head part, for example Copper or other anode material as described above, which is in contact with one or more Abieitern from the anode material and presses against a made of the anode material collector, such as bimetallic collector. Thus, the collector or the corresponding region can be made about the same material as a bimetallic collector, as the

corresponding Abieiter and the area of Bimetallniets. It may further be preferred that the boundary region between the first metallic material and the second metallic material is from a

Envelope is surrounded. In particular, in this embodiment, corrosion of the less noble of the two metallic compounds can be prevented, for which the danger may otherwise exist in principle in a border area. For example, the envelope may be configured from an electrically insulating material. As a non-limiting example, the envelope may be made of rubber.

Furthermore, it may be advantageous that the battery cell further comprises a cooling element which is fixed by the rivet to the at least one Abieiter and the collector. In this embodiment can be made possible by a close thermal contact of the cooling element, which may be configured for example as a cooling plate, and the Abieiter or the Abieitern and the collector a particularly effective cooling by a close thermal contact. Moreover, in this embodiment, a mechanical fixation of the electrode arrangements to the cooling element can be realized in a simple manner. For this purpose, the cooling element may have an opening for the rivet, which is in coincidence with the openings of the collector and the Abieiters or the Abieiter.

The battery cells thus provided can be connected in parallel and / or in series with one another to one or more battery modules. The number of battery cells and the corresponding interconnection can be selected in particular depending on the desired specification of the battery module or the battery modules.

The type of the provided battery cells is not limited in the context of the present invention. For example, the same or different battery cells can be provided. As an example

Battery cells are called lithium-ion cells here.

Furthermore, it can be provided that at least one battery cell of the battery module is a pouch cell and thus at least one Abieiter part of a Pouch cell is. The corresponding benefits may be particularly effective in providing one or more pouch cells. This may be due in particular to the fact that pouch cells have flexible Abieiter due to their structure and have a comparatively flat housing compared to so-called HardCase cells. This geometric

Properties can be optimally used in the structure and method proposed here.

drawings

Further advantages and advantageous embodiments of the objects according to the invention are illustrated by the drawings and explained in the following description, wherein the features described individually or in any combination may be an object of the present invention, as far as the context clearly does not

Opposite results. It should be noted that the drawings only

descriptive and are not intended to limit the invention in any way. 1 shows a schematic sectional view through an embodiment of a rivet for a battery cell;

FIG. 2 shows a schematic sectional view through a further embodiment of a rivet for a battery cell; FIG.

3 shows a schematic sectional view through an embodiment of a battery cell;

4 is a schematic sectional view through a further embodiment of a battery cell; and

Fig. 5 is a schematic sectional view through a further embodiment of a battery cell.

In the figure 1, a part of a rivet 10 is shown, which is suitable for a battery cell. In particular, the rivet 10 serves to fix one or a plurality of Abieitern 26 an electrode assembly to a collector 28. The rivet 10 may be formed approximately from a unitary material. The rivet 10 comprises a first head part 16, which is fastened to a shaft 18 or designed in unison therewith. Not shown is a second head part 20, which is arranged on the opposite side to the first head part 16 of the shaft 18.

It is further shown that the rivet 10 has a roughened fixing surface 22 at least at its first head part 16.

FIG. 2 shows a further embodiment of a rivet 10. It is shown that the rivet 10 is a Bimetallniet and that the rivet 10 is formed at its first head portion 16 of a first metallic material and is formed at its second head portion 20 of a second metallic material. It is further shown that the boundary 24 between the first metallic material and the second metallic material extends in the shaft 18.

In principle, the different materials can be welded, for example by friction welding.

At the boundary 24 may further be provided a sheath 25 which covers the boundary area so as to prevent corrosion.

FIG. 3 shows a first embodiment of a battery cell. It is shown that a plurality of Abieitern 26 is fixed by a rivet 10 with a collector 28. For this purpose, it is provided that the collector 28 and the Abieiter 26 each have openings 27, 29, wherein the opening 27 of the collector 28 and the opening 29 of the Abieiter 26 are positioned in coincidence, and wherein through the openings 27, 29 of the rivet 10, which fixes the Abieiter 26 with the collector 28.

In particular, conductors 26 of the same polarity can be connected to the collector 28. It is further shown that not only the rivet is a roughened

Having fixing surface, but that the collector 28 is roughened, so in particular at the position of the rivet 10 has a roughened surface 30.

FIG. 4 shows a further embodiment of a battery cell. In particular, a bimetal rivet is used as the rivet 10 to realize that the first header 16 at least one anodic Abieiter 26 ', such as copper, to an anode collector 28', also about copper, fixed and that the second head part 20 at least one cathodic Abieiter 26 ", such as aluminum, on a cathode collector 28", such also made of aluminum, fixed. In this case, the collector 28 as a bimetallic collector having a

Aluminum layer as a cathode collector 28 "and a copper layer as

Anodenkollektor 28 'be configured. It is further shown that the rivet 10 is isolated from the collector 28, but not from the collector 26, by the enclosure 25. This envelope 25 can be guided, for example, in the collector 28, whereupon the particular film-like Abieiter 26 are positioned and fixed by the rivet 10.

FIG. 5 shows a further embodiment of a battery cell. It is provided that the battery cell further comprises a cooling element 32 which is fixed by the rivet 10 with the at least one Abieiter 26 and the collector 28. In particular, it may be advantageous for the cooling element 32 to come into contact with at least one drain 26, since these are exposed to a comparatively large heat development, for example in the case of a short circuit, so that cooling here is particularly effective. Compared to the collector 28, the cooling element 32, such as heat sink, but by an electric

Isolator 34 to be isolated.

Claims

claims

1 . A battery cell comprising an electrode assembly having at least one drain (26) for contacting active material and a collector (28) for externally contacting the electrode assembly therethrough

characterized in that the battery cell further comprises at least one rivet (10) and that the collector (28) and the drain (26) each have at least one opening (27, 29), the opening (27) of the collector (28) and the opening (29) of the Abieiters (26) are at least partially aligned with each other, and wherein through the opening (29) of the Abieiters (26) and the opening (27) of the collector (28) of the rivet (10), which fixed the Abieiter (26) with the collector (28).

2. Battery cell according to claim 1, characterized in that the Abieiter (26) is designed like a foil and that the collector (28) is designed to be rigid.

3. Battery cell according to claim 1 or 2, characterized in that the rivet (10) has at least one head part (16, 20) with a roughened fixing surface (22).

4. Battery cell according to one of claims 1 to 3, characterized in that the rivet (10) is a Bimetallniet.

5. Battery cell according to claim 4, characterized in that the rivet (10) has a first head part (16), a second head part (20) and a first head part (16) and the second head part (20) connecting shaft (18) wherein the first header (16) is formed of a first metallic material and wherein the second header (20) is formed of a second metallic material.

6. Battery cell according to claim 5, characterized in that the boundary (24) extends between the first metallic material and the second metallic material in the shaft (18).

7. Battery cell according to one of claims 4 to 6, characterized in that the first metallic material comprises aluminum and that the second metallic material is selected from the group consisting of copper, nickel-plated copper and Hilumin.

8. Battery cell according to one of claims 4 to 7, characterized in that the boundary (24) between the first metallic material and the second metallic material by a sheath (25) is surrounded.

9. Battery cell according to one of claims 4 to 8, characterized in that the first head part (16) at least one Anodenableiter (26 ') to an anode collector (28') fixed and that the second head part at least one Kathodenableiter (26 ") on a Cathode collector (28 ") fixed, in particular wherein the anode collector (28 ') and the cathode collector (28") are designed as a common bimetallic collector.

10. Battery cell according to one of claims 1 to 9, characterized in that the battery cell further comprises a cooling element (32) which is fixed by the rivet (10) with the at least one Abieiter (26) and the collector (28).