DE102018210717A1 - Method for producing an electrode assembly for an electrical energy storage unit and corresponding electrical energy storage unit - Google Patents

Abstract

A method for producing an electrode assembly (300) for an electrical energy storage unit is described, which comprises the following steps: a) providing a first electrode web (100) which is at least partially coated with a first material (101); b) generating first cuts (102) in the first electrode track (100); c) first coating the first electrode track (100) with a second material; d) generating second cuts (108) in the first electrode track (100); e) second coating of the first electrode web (100) with the second material; f) producing a third incision (111) in the first electrode web (100). Furthermore, an electrical energy storage unit having an electrode assembly (300), which was produced according to the disclosed method, is disclosed ,

Description

The present invention is based on a method for producing an electrode assembly for an electrical energy storage unit and a correspondingly produced electrical energy storage unit.

State of the art

Due to the increasing electrification, particularly in the vehicle sector, electrical energy storage devices are becoming increasingly important and in greater demand. In addition to increasing energy and power density, the focus is also on increasing the security of electrical energy stores. Electrical energy storage devices are usually made up of several smaller electrical energy storage units, which are electrically connected to one another in a suitable manner. In particular, the focus is on optimizing these electrical energy storage units with regard to the points mentioned.

In the publication JP 2013-101877 describes a method whereby an electrode of a secondary battery can be impregnated more quickly with an electrolyte.

In the publication JP 2017-103253 describes a method by which boundary layers within a lithium ion battery are optimized by an uneven shape in such a way that their mutual contact areas are enlarged.

Disclosure of the invention

Advantages of the invention

A method for producing an electrode assembly for an electrical energy storage unit is disclosed.

A first electrode track is provided, which is at least partially coated with a first material. The first material can be, for example, a cathode material of an electrical energy storage unit. The coating with the first material can be continuous. For example, the material of the uncoated electrode web can comprise aluminum or the uncoated electrode web can be made of aluminum.

First incisions are made in the first electrode track. The first incisions can be made in particular in the transverse direction.

Furthermore, the first electrode web is coated with a second material for the first time. The second material can in particular be a separator material of an electrical energy storage unit, for example a solid-state separator based on polymer. The second material, which is used as the coating material, preferably fills the first incisions at least partially, in particular completely.

Furthermore, second incisions are made in the first electrode track. For example, these incisions are made at least partially in the longitudinal direction of the first electrode track.

Furthermore, the first electrode web is coated with the second material a second time.

Furthermore, third incisions are made in the first electrode track.

This is advantageous since the manufacturing method disclosed ensures that a lower contact or contact resistance is achieved at the interfaces than by methods known from the prior art. In addition, there is the advantage of electrical insulation of the edge regions of the first electrode track or of the resulting electrodes. In addition, a uniform material thickness is advantageously achieved in the edge region of the coating surfaces. Furthermore, the method advantageously contributes to an optimized coating process which can thereby be carried out in a material and cost-saving manner and thus in a more environmentally friendly manner, since for example carrier films and protective films are saved. At the same time, the complexity of the manufacturing process is advantageously reduced, since laminating processes for connecting the first electrode web to the second material, in particular the cathode and separator, can be omitted.

The sequence described above is to be understood as the preferred sequence of the process steps, it being possible, if necessary, to change the sequence, in particular the steps of the incision and the coating, and this can take place in an application-specific manner.

Further advantageous embodiments of the present invention are the subject of the dependent claims.

When producing the second incisions, a first edge region of the first electrode track, which is at least partially not coated with the first material, is expediently cut in order to produce current conductor tabs. This means that edge material of the first electrode web is removed. This leaves uncoated sections in the edge region of the first electrode track, which are preferably in relation to the removed material are less than 50 percent in terms of area, which means that more material is removed in the edge area than remains. This is advantageous because it enables a simple possibility of electrical connection to a pole connection of an electrical energy storage unit. Furthermore, it is made possible that the newly created edge region is at least partially coated in the subsequent step, in particular up to the current conductor tabs, and thus good electrical insulation is achieved.

The first incisions and the second incisions expediently take place spatially, at least in parts, not parallel to one another. This is advantageous since the electrode web is thus cut in the longitudinal and transverse directions, which enables an advantageous division of the electrode web.

The first electrode web is expediently continuously coated on both sides with the first material. This is advantageous since coating steps can thus be carried out from both sides of the electrode track and at the same time the electrical capacity of an electrical energy storage unit produced from the first electrode track increases in an advantageous manner.

A first side of the first electrode web is expediently coated with the second material during the first coating of the first electrode web with the second material. This has the advantage that further properties are impressed on the first side of the first electrode track, the second material preferably having an electrically insulating effect and, in a particularly preferred embodiment, being designed as a separator material or comprising one.

Expediently, a second side of the first electrode web, which lies opposite the first side, is coated with the second material during the second coating of the first electrode web with the second material. This has the advantage that the same properties are impressed on the second side of the first electrode track as on the first side, since in both cases the second material is coated and therefore both sides are constructed symmetrically in this regard. It is thus advantageously possible, for example, to apply a corresponding counter electrode to the first electrode track from both sides.

A second edge region of the first electrode web is expediently kept free of the second material when the first electrode web is coated with the second material. This applies in particular if the second edge area is current collector tabs. This has the advantage that the edge area can be welded, for example, without the need for expensive pretreatment.

The third incisions in the first electrode track are expediently produced at least partially in the same spatial area of the second incisions. This is advantageous since the spatial division of the first electrode track generated by the production of the second incisions is thus at least partially restored even after coating.

The first material is expediently a cathode material for an electrical energy storage unit, for example a coating made of NCM, NCA or lithium iron phosphate, or an anode material, for example based on graphite, lithium titanate (LTO), silicon or lithium, which is applied to a conductive carrier material, and the second material is a separator material for an electrical energy storage unit, for example based on PE, PP, polyolefin or an ion-conducting solid electrolyte. Alternatively, the first material can comprise a cathode material or anode material and the second material can comprise a separator material. The advantages described can thus be realized for the electrical energy storage unit produced from the cathode material or anode material and the separator material.

The first incisions and the second incisions expediently run, in particular at least partially, at right angles to one another and / or the first incisions and the third incisions run, in particular at least partially, at right angles to one another. This is advantageous since the first electrode web with the corresponding coatings is cut in the longitudinal and transverse directions and a corresponding spatial division is thereby generated.

The invention furthermore relates to an electrical energy storage unit which has an electrode assembly which was produced by the method described above. This is advantageous since the electrical energy storage unit thus realizes the advantages described.

An electrical energy storage unit can in particular be understood as an electrochemical battery cell. For example, the electrical energy storage unit can be a lithium-based battery cell. In particular, the electrical energy storage unit can be a lithium-ion battery cell. Furthermore, the battery cell of the type lithium polymer accumulator, lithium metal accumulator or of the type solid-state accumulator or in general Accumulator of any electrochemical composition. A capacitor is also possible as an electrical energy storage unit.

list of figures

Advantageous embodiments of the invention are shown in the figures and detailed in the following description.

• 1 ein Flussdiagramm des offenbarten Verfahrens gemäß einer Ausführungsform;
• 2 ein Flussdiagramm des offenbarten Verfahrens gemäß der Ausführungsform;
• 3 eine schematische Schnittdarstellung einer Anlage zur Herstellung einer elektrischen Energiespeichereinheit unter Verwendung eines gemäß dem offenbarten Verfahren hergestellten Elektrodenverbundes.

Show it:

• 1 a flowchart of the disclosed method according to an embodiment;
• 2 a flowchart of the disclosed method according to the embodiment;
• 3 is a schematic sectional view of a system for producing an electrical energy storage unit using an electrode assembly manufactured according to the disclosed method.

Embodiments of the invention

The same reference symbols in all figures denote the same device components or the same method steps.

1 10 shows a flow diagram of the disclosed method according to an embodiment. The corresponding sectional diagrams for the cuts shown can be found in 2 in the corresponding process steps.

In a first step S11 becomes an electrically conductive carrier film 100 for cathode material with a corresponding cathode material 101 coated on both sides. As in 1 and 2 in step S11 it can be seen that there is an edge region of the carrier film on both long sides 100 uncoated.

In a second step S12 be in the with the cathode material 101 coated carrier film 100 first cuts 102 generates which are continuous, which means removal of cathode material 101 brings with it. This creates on the coated carrier film 100 sections 103 through the first incisions 102 are limited.

In a third step S13 becomes a first top of that with the cathode material 101 coated carrier film 100 coated with a separator material, wherein a first separator material layer 106 arises. Furthermore, there is a first transport film 105 shown on the with the cathode material 101 coated carrier film 100 is transported. Accordingly, the coating with the separator material takes place on that of the first transport film 105 facing away from the first top. The coating with the separator material takes place, as shown, over that with the cathode material 101 coated area. This is in 2 to see again in the cut.

In a fourth step S14 become second incisions in the coated carrier film 100 carried out, from the uncoated edge region of the coated carrier film 100 first sections are cut out such that remaining second sections of current conductor tabs 107 form. Thereby material is between the current collector tabs 107 cut out. Furthermore, in the middle of the coated carrier film 100 a continuous, longitudinal incision 108 carried out. The incision 108 cuts through the coated carrier film, as well 2 can be seen completely.

In a fifth step S15 becomes a second top of that with the cathode material 101 coated carrier film 100 coated with the separator material, almost as a counterpart to the one in step S13 performed coating, wherein a second separator material layer 110 arises. How especially out 2 can be seen, enclose the first separator material layer 106 and the second separator material layer 110 the one with the cathode material 101 coated carrier film 100 except for the current collector tabs 107 Completely. There is also a second transport film 109 shown, which serves to transport the entire layer composite.

In a sixth step S16 will be a third incision 111 generated, which divides the layered composite in the middle on the long side in half. Thus, two functionally equivalent layer composites are generated, on which, for example, a corresponding anode can be placed in order to produce the functionality of the energy storage required for an electrical energy storage unit.

2 shows a flowchart of the disclosed method according to the embodiment, wherein for the respective method steps the corresponding sectional images to the in 1 shown sections are shown.

As from the sectional images to the cuts AA and BB emerges remains in the step S11 each have an edge area in the longitudinal direction of the carrier film 100 uncoated.

As from the sectional images to the cuts BB and CC emerges in the second step S12 consistent first cuts 102 creates sections 103 arise through the first cuts 102 are spatially separated from each other.

As from the sectional images to the cuts AA . BB and CC emerges are in step S13 the incisions 102 through the first separator material layer 106 filled. It can also be seen, in particular from the sectional view of section AA, that the first separator material layer 106 part of the uncoated edge area of the carrier film 100 all covered.

As from the sectional images to the cuts AA . BB . CC and DD emerges are in the step S14 current drain 107 from the uncoated edge area of the carrier film 100 cut out. In the area of the uncoated edge area of the carrier film 100 which is cut off and not as current collector tabs 107 serves, closes the carrier film 100 after cutting, flush or nearly flush with the separator material layer 106 ,

As from the sectional images to the cuts AA . BB . CC and DD emerges in the fifth step S15 a second separator material layer 110 on the side of the coated carrier film that has not yet been coated with the separator material 100 applied. As especially in the sectional images of the cuts AA . BB and CC shown surround the first separator material layer 106 and the second separator material layer 110 the one with the cathode material 101 coated carrier film 100 except for the current collector tabs 107 Completely.

As from the sectional images to the cuts AA . BB . CC and DD emerges in the sixth step S16 the third incision 111 generated, which divides the layer composite in the middle on the long side in half. Furthermore is in the sectional images of the cuts AA . BB and CC shown that by a suitable choice of the cutting width of the third incision 111 that is smaller than the width of the incision 108 in the fourth step S14 , as well as the position of the third incision 111 , preferably longitudinally on the center of the carrier film 100 who have favourited the edges of the incision 111 are completely covered with the separator material, so that the separator material also has an electrically insulating effect here.

3 shows a schematic representation of a manufacturing process of an electrical energy storage unit using an electrode assembly manufactured according to the disclosed method 300 which is on a transport foil 303 located. The electrode assembly 300 comes with an anode track 301 brought together, the anode track 301 when brought together with the electrode assembly 300 on a transport foil 302 located. In order to deflect the corresponding foils, appropriate deflection rollers are used 305 for use.

For the integral connection of the anode material of the anode track 301 with the material of the electrode composite 300 becomes a laminator 306 used, the transport foils after the lamination process 302 . 303 via appropriate pulleys 305 be removed. The composite thus produced is then made using a corresponding separating device 307 divided into sections, the division along the incisions described in the disclosed method 102 takes place so that the cut edges resulting from the separation are electrically insulated by the separator material.

Then the resulting pieces can be stacked 308 are assembled, from which an electrical energy storage unit can be produced in a further method step, not shown here.

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• JP 2013101877 [0003]
• JP 2017103253 [0004]

Claims (11)

Method for producing an electrode assembly (300) for an electrical energy storage unit, comprising the steps: a) providing a first electrode web (100) which is at least partially coated with a first material (101); b) producing first incisions (102) in the first electrode track (100); c) first coating the first electrode web (100) with a second material; d) producing second incisions (108) in the first electrode track (100); e) second coating of the first electrode web (100) with the second material; f) producing a third incision (111) in the first electrode track (100). Procedure according to Claim 1 , wherein in step d) a first edge region of the first electrode web (100), which is at least partially not coated with the first material (101), is cut, in particular in order to produce current conductor tabs (107). Method according to one of the preceding claims, wherein the incisions (102, 108) in steps b) and d) are spatially at least partially not parallel to one another. Method according to one of the preceding claims, wherein the first electrode web (100) is continuously coated on both sides with the first material (101). Procedure according to Claim 4 , wherein in step c) a first side of the electrode web (100) is coated with the second material. Procedure according to Claim 4 or 5 , wherein in step e) a second side of the electrode web (100), which lies opposite the first side, is coated with the second material. Method according to one of the preceding claims, wherein a second edge region of the first electrode web (100), in particular current conductor tabs (107), remains free of the second when coating the first electrode web (100) with the second material in step c) or in step e) Material. Method according to one of the preceding claims, wherein the generation of the third incision (111) in step f) takes place at least partially in the same spatial area of the second incisions (108) from step d). Method according to one of the preceding claims, wherein the first material (101) is a cathode material for an electrical energy storage unit and the second material is a separator material for an electrical energy storage unit or comprise the same. Method according to one of the preceding claims, wherein the first incisions (102) and the second incisions (108) run at right angles to one another and / or the first incisions (102) and the third incision (111) run at right angles to one another. Electrical energy storage unit, which has an electrode assembly (300), which according to a method of Claims 1 to 10 was produced.

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