Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/02—Details
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/04—Construction or manufacture in general
  • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/058—Construction or manufacture
  • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
  • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/052—Li-accumulators
  • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
  • H01M2010/4292—Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
  • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49108—Electric battery cell making

Definitions

• the invention relates to an electrochemical cell having an electrode stack with in particular a plurality of layers of active material. Furthermore, the invention relates to a method for producing an aforementioned electrochemical cell. Furthermore, the invention relates to a battery with at least one aforementioned electrochemical cell.
• There are lithium-ion cells are known in which anodes and cathodes are arranged alternately, wherein between the anodes and the cathodes in each case a separator is provided.
• the cathodes generally have a smaller areal extent than the anodes.
• an electrochemical cell comprising at least one electrode stack, which is arranged within a sheath of the electrochemical cell, wherein the electrode stack at least one cathode layer and one anode layer wherein a separator layer is arranged between the first electrode layer and the second electrode layer, and wherein the cathode layer has a smaller areal extent than the anode layer.
• This electrochemical cell is further characterized in that an edge layer is arranged adjacent to the first electrode layer. The edge layer is preferably made mechanically stabilizing.
• an electrode stack is to be understood as a device which, as an assembly of a galvanic cell, also serves to store chemical energy and to deliver electrical energy.
• the electrode stack has a plurality of plate-shaped elements, at least two electrodes, namely in particular anode and cathode, and a separator which at least partially receives the electrolyte.
• at least one anode, a separator and a cathode are stacked or stacked, wherein the separator is at least partially disposed between the anode and the cathode.
• This sequence of anode, separator and cathode can be repeated as often as desired within the electrode stack.
• the plate-shaped elements are wound into an electrode winding.
• electrode stack is also used for electrode windings: Before the electrical energy is emitted, stored chemical energy is converted into electrical energy. During charging, the electrical energy supplied to the electrode stack or the galvanic cell is converted into chemical energy and stored a plurality of electrode pairs and separators, particularly preferably some of the electrodes are electrically connected to one another.
• an at least partial limitation is to be understood, which delimits the electrode stack to the outside.
• the envelope is preferably gas and liquid tight, so that a material exchange with the environment can not take place.
• the electrode Stacks are located within the enclosure. At least one current conductor, in particular two current conductors extend out of the enclosure and serve to connect the electrode stacks.
• the outwardly extending current conductors preferably represent the positive pole connection and the negative pole connection of the electrochemical cell. However, it is also possible for a plurality of current conductors to extend out of the enclosure, in particular four current arresters. If the electrochemical cell has two electrode stacks which are connected in series with one another, two electrodes of different electrode stacks are connected to one another.
• a current collector is an element which is made of an electrically conductive material. It is used to conduct electricity between two geometrically separated points.
• a current collector is connected to an electrode stack.
• the current conductor is connected to all similar electrodes of an electrode stack, i. either with the cathodes or with the anodes. It goes without saying that a current conductor is not connected to the cathodes and anodes of an electrode stack at the same time, since this would lead to a short circuit.
• a current collector may be connected to different electrodes of different electrode stacks, e.g. in a series connection of the two electrode stacks. At least one current collector extends from the enclosure and may serve to connect the electrochemical cell to the outside.
• the current collector may be integrally formed with one or more electrodes. A distinction between current collector and electrode can be seen in that the current conductor is not coated in particular with active electrode material.
• the cathode layer By providing the edge layer on the first electrode layer, the cathode layer can be mechanically enlarged. The enlargement results in a reduced surface pressure on the electrode layers, in particular on the cathode layer, while the pressure remains constant.
• the cathode layer and the edge layer are preferably in a common Plane arranged.
• the separator layer which is in contact with the first electrode layer and in particular overlaps the cathode layer in an edge region of the first electrode layer, can thereby be supported by the edge layer.
• the anode layer which is arranged on the side of the separator layer facing away from the first electrode layer, is indirectly supported by the edge layer.
• the edge layer is preferably arranged at least on one side of the first electrode layer.
• the boundary layer is arranged on one side of the first electrode layer, from which a current conductor is connected to the cathode layer.
• the current conductor is preferably not coated with active electrode material.
• the current arrester may have a cross-sectional thickness which is less than the cross-sectional thickness of the first electrode layer.
• the cross-sectional thickness of the current conductor can be summed up by a certain cross-sectional thickness of the edge layer, in particular to a cross-sectional thickness which corresponds to the cross-sectional thickness of the cathode layer in the region of the interface between the current conductor and the first electrode layer.
• the edge layer is preferably arranged on at least two mutually opposite sides of the first electrode layer.
• the edge layer can be split into several, in particular not interconnected, portions of the edge layer.
• the edge layer is arranged circumferentially around the cathode layer.
• a circumferential area around the cathode layer can be reinforced.
• the anode layer is thereby supported in a peripheral region of the edge layer.
• the edge layer may form a particular supporting frame around the cathode layer.
• the electrode layer preferably forms a composite layer together with the edge layer.
• the composite layer preferably has the mechanical properties that would have a continuous cathode layer. As a result, all the disadvantages can be compensated, which can result from the smaller areal extent of the first electrode layer.
• a length of the composite layer corresponds to a length of the second electrode layer.
• a width of the composite layer corresponds to a width of the second electrode layer.
• An outline of the composite layer preferably corresponds to an outline of the second electrode layer.
• corresponding is meant a wide-ranging concept of size, which is to be understood in particular as manufacturing-related tolerances
• deviations in the single-digit percentage range between the two length specifications may well lie in. However, the deviations are preferably smaller, in particular smaller than 5%. based on the geometric surface area.
• the edge layer has a cross-sectional thickness that substantially corresponds to a cross-sectional thickness of the first electrode layer.
• the edge layer has a hardness which corresponds approximately to the hardness of the first electrode layer.
• the edge layer can simulate an enlarged cathode layer.
• the first layer may be a cathode layer and the second layer may be an anode layer.
• the invention is achieved by a method for producing a generic electrochemical cell, wherein at least on one side of the electrode layer, an edge layer is attached.
• the edge layer and the first electrode layer can be arranged in a common plane.
• the edge layer can be arranged at least on one side of the first electrode layer, in particular on one side of the first electrode layer, of which a current conductor is connected to the first electrode layer.
• the edge layer can be arranged at least on two respective opposite sides of the first electrode layer. More preferably, the edge layer can be arranged circumferentially around the first electrode layer.
• a composite layer is formed together from the first electrode layer with the edge layer.
• Fig. 1 shows an inventive electrochemical cell in flat construction in the
• FIG. 2 shows a detail view of an electrochemical cell according to FIG. 1 in FIG
• FIG. 3 is a detail view of an electrochemical cell according to FIG. 1 in FIG.
• FIG. 4 a Cross section after the application of a boundary layer; 4 a) a cathode of the electrochemical cell according to FIG. 1 before the application of an edge layer, FIG.
• FIG. 5 a an alternative cathode according to FIG. 1 before the application of a
• FIG. 1 shows an electrochemical cell 1 according to the invention.
• the electrochemical cell 1 comprises an electrode stack 2 which is accommodated within an enclosure 4.
• the envelope 4 consists essentially of two moldings, which were made of packaging film. The moldings were brought into their illustrated form in a deep drawing process.
• the sheath 4 has a limited resistance to externally acting forces, since the sheath 4 is largely elastic, so that forces acting on externally can be passed on to the electrode stack. It can be seen that forces in the edge region F R of the electrochemical cell 1 can be greater than forces occurring in the central region F z .
• FIG. 1 it can not be seen that a plurality of current conductors 3, which extend through the sheath 4, are electrically conductively connected to the electrode stack 2.
• FIG 2 shows a detail of the electrode stack 2 of an electrochemical cell of Figure 1 shown enlarged.
• the electrode stack 2 has a plurality of first electrode layers 5 and a plurality of second electrode layers 6.
• the electrode layers 5, 6 are designed flat and arranged parallel to a plane E.
• the first electrode layers 5 and the second electrode layers Layers 6 are arranged alternately.
• a separator layer 7 is arranged between the first electrode layer 5, which in the present case is a cathode layer, and the second electrode layer 6, which in the present case is an anode layer.
• the current conductors 3 can be seen, which are arranged outside the electrode layers 5, 6. Extensions of the current conductor 3 within the electrode layers 5, 6 form the electrodes 13, 14.
• a cathode 13 is provided within the cathode layer 5; Within the anode layer 6, an anode 14 is provided.
• the current conductors 3 may be integrally formed with the respective electrodes 13, 14; However, the current conductor 3 can also be formed separately from the electrodes 13, 14 and be connected to them in an electrically conductive manner.
• the cathode layer 5 has a smaller areal extent than the anode layer 6. Thus, it can be seen that in an edge region 11, the anode layer 6 projects beyond the cathode layer 5.
• gaps 12 are formed between two anode layers 6, which are bounded on one side by a side 9 of the cathode layer 5. Due to the gap 12, the anode layers 6 in the case of external Karataufbringung perpendicular to the respective planes E of the layers no resistance counteracted, so that the anode layers 6 can bend in the edge region 11 into the gaps 12, which is indicated by the dashed lines , This can lead to signs of aging on the electrode stacks.
• FIG. 3 shows the detail of the electrode stack 2 according to FIG. 2 after an edge layer 8 has been applied. It can be seen that the gap 12 is completely filled by the edge layer 8 of polyurethane.
• the edge layer 8 is attached to one side 9 of the cathode layer 5 and arranged with this in a plane E.
• the cathode layer 5 and the edge layer 8 forms a composite layer 10, which is arranged between two respective anode layers 6.
• the edge layer 8 in this case has a hardness which corresponds to the hardness of the cathode layer 5.
• the edge layer 8 acts mechanically stabilizing, in particular on the anode layer. 6
• FIG. 4 a shows a cathode layer 5 before the application of an edge layer.
• the cathode layer 5 has a length Li and a width B.
• In one side 9 of the current conductor 3 is connected to the cathode.
• FIG. 4b shows a development of the invention as shown in FIG. On the cathode layer 5, according to FIG. 5b), an edge layer 1 1 is attached circumferentially around the cathode layer 5, so that a composite layer 10 is formed therefrom. Both the length L 2 and the width B 2 of the composite layer 10 are thus greater than the length U as well as the width Bt of the cathode layer 5.
• FIG. 5c shows by way of example an anode layer 6 of the electrochemical cell according to the invention.
• the length L 2 corresponds to the length L 2 of the composite layer 10.
• the width B 2 of the anode layer 6 corresponds to the width B 2 of the composite layer 10.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Battery Electrode And Active Subsutance (AREA)
• Secondary Cells (AREA)
• Primary Cells (AREA)
• Cell Separators (AREA)

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• 2009
  • 2009-10-05 DE DE102009048237A patent/DE102009048237A1/de not_active Withdrawn
• 2010
  • 2010-09-13 JP JP2012532475A patent/JP2013506967A/ja active Pending
  • 2010-09-13 EP EP10754695A patent/EP2486614A1/de not_active Withdrawn
  • 2010-09-13 KR KR1020127011575A patent/KR20120091184A/ko not_active Withdrawn
  • 2010-09-13 CN CN2010800443777A patent/CN102687312A/zh active Pending
  • 2010-09-13 WO PCT/EP2010/005604 patent/WO2011042111A1/de not_active Ceased
  • 2010-09-13 US US13/500,388 patent/US20120282517A1/en not_active Abandoned
  • 2010-09-13 BR BR112012007806A patent/BR112012007806A2/pt not_active IP Right Cessation

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