Classifications

• • 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
  • H01M10/0404—Machines for assembling batteries
• • 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
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
• • 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
• • 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

Definitions

• the present invention relates to a method and an apparatus for producing a built-up of energy storage cells cell composite.
• lithium-ion batteries are increasingly used, for example, reinforced in the automotive industry.
• lithium-ion batteries different electrolytes can be used, with automobiles increasingly using polymers as electrolytes.
• there are different designs in the field of lithium-ion cells in particular, the three types cylindrical, prismatic and bag-like (coffee-bag cell) are mentioned here.
• a coffee-bag cell also called bag cell or pouch cell
• a polymer-based electrolyte so that the rigid housing of a cell can be omitted.
• a lightweight and flexible cell construction at low cost is thus feasible.
• such cells are form unstable, which can lead to problems in the further processing of the cells into a cell composite.
• Such coffee bag or pouch cells are combined in a subsequent processing step to form a composite of a plurality of Pouch cells, wherein such a cell composite forms the lithium-ion battery or alternatively a part of such a lithium Ion battery represents.
• the individual Pouch cells are first stacked to form a more dimensionally stable package or composite, the Abieiter the individual cells are then electrically connected together in a next step.
• the individual cells of a composite are connected either electrically in series or in parallel at the end.
• an object of the present invention is to provide a method and a device which / which overcomes the problems mentioned and in particular allows a better contact.
• the essential aspect of the method according to the invention is that the electrical connection of the individual cells takes place before stacking.
• the energy storage cells are transported, for example, in the inline process through a processing area, wherein successively adjacent energy storage cells are electrically connected to each other.
• connection of the electrical pole connections by applying connecting elements to the respective pole terminals and arresters and by fixing the connecting elements to the pole terminals, such that an electrical connection is formed.
• the setting of the connecting elements by heat input, for example by laser light.
• electromagnetic pulse welding is a preferred way to make the connection.
• the connecting elements which are preferably provided as electrically conductive strips of metal, removed from a roll and cut to length.
• the laying of the energy storage cells on the transport unit is preferably carried out via a handling device, such as a robot.
• the energy storage cells are fixed on the transport unit in at least one direction, preferably a plurality of directions, in order to ensure an exact position during transport.
• the processing area comprises further processes, such as a curing process, an inline inspection process electrical parameters, a labeling process, a process for applying cooling pads or spacers and / or a process for folding or Stack the two-dimensional array of energy storage cells into a cell composite.
• the transport unit preferably comprises a conveyor belt to which the energy storage cells are placed.
• the fixation of the energy storage cells can bswp. done by vacuum. Of course, other possibilities of fixation in at least one direction are possible.
• the transport unit may also have workpiece carriers that transport the energy storage cells.
• the transport of the energy storage cells through the processing area is preferably clocked. However, it is also conceivable to transport the energy storage cells continuously.
• the energy storage cells are preferably form unstable energy storage cells.
• the method has great advantages, since it does not require stabilization measures such as frames, etc., to the To connect cells electrically.
• stabilization measures such as frames, etc.
• the aforementioned method can be used in so-called pouch cells.
• the energy storage cells may also be capacitors, for example. Supercapacitors.
• Figure 1 is a perspective view of a processing plant for carrying out the method according to the invention
• Figure 2a-d are schematic representations of various types of pouch cells
• Figure 3 is a detail view of the system of Figure 1;
• Figure 4 is a schematic representation of three pouch cells with electrical connector
• FIG. 5 is a schematic representation of a processing plant similar to Figure 1 but with a different transport system.
• a processing system is shown and designated by the reference numeral 10.
• the processing system 10 is used in this embodiment to edit so-called pouch cells, in which case in particular the electrical connection of several pouch cells is meant.
• pouch cells in which case in particular the electrical connection of several pouch cells is meant.
• other energy storage cells can be processed.
• low-profile, preferably form-unstable or frameless energy storage cells can be processed.
• Energy storage cells in the form of capacitors for example.
• Supercapacitors can be processed.
• pouch cells also called coffee bag cells
• a lithium-ion battery cell with a polymer as the electrolyte
• the active part sandwiched in a cladding film and tightly welded wherein the cladding film forms a circumferential sealing seam and wherein the cell poles are formed by Abieiter, which preferably pass through the sealed seam on one side of the cell.
• Such single, preferably parallelepiped, flat and frameless battery cells are stacked into a cell composite with the individual cells of the cell composite connected in series or in parallel.
• Such a cell composite of a plurality of individual Pouch cells can form a battery.
• the processing system shown in Fig. 1 is now used to process individual flat-building Pouch cells to a cell composite, which is connected in one - not shown - subsequent processing either with other cell compounds or processed directly to a battery becomes.
• Low-profile means in this context that the upper or lower surface (top or bottom) of the cell is significantly larger than the lateral surface (narrow side) of the cell, or in other words, length and width of the cell are significantly greater than the height (thickness ).
• the cell poles are formed by arresters that pass through the cladding film. This also means that two arresters, namely one for the positive pole and one for the negative pole, are provided per pouch cell, which can be provided on the same side of the cell or alternatively on different sides of the cell.
• the arrangement of the arrester has an effect in the production of a cell composite insofar as the electrical connections between the individual cells are to be carried out differently.
• the processing equipment shown in Fig. 1 is not limited to a specific type of pouch cell, but rather can process different pouch cell types with differently arranged dischargers.
• Fig. 2a, b, c and d several examples of different Pouch cells are shown in a series or parallel connected cell composite.
• the lower row, Fig. 2a shows three pouch cells 20, the two arresters 22, 24 on the same side, here the left narrow side, are provided.
• the three pouch cells 20 shown in this example lie in a row and thus in one plane, the pouch cells being arranged so that the arresters 22, 24 point to the same, here left side.
• the pouch cells 20 are arranged so that the positive pole and the negative pole alternately from one cell to the next once at the front and once back (front and rear is related to the transport direction of the cells, see Fig. 2). In other words, this means that the positive pole of a pouch cell is immediately adjacent to the negative pole of the subsequent pouch cell.
• the electrical connector 26 may be, for example, way to act an electrically conductive strip of a metal which is fixed to the Abieitern 22, 24. This setting can be done via different joining techniques, for example by welding, soldering, gluing, etc.
• This series of electrically interconnected Pouch cells 20 is shown in Fig. 2a as a stack 30, in which the series of Pouch cells 20 are zigzagged superimposed.
• This stack 30 forms a cell composite 32 in series.
• a number of pouch cells 20 is shown, these pouch cells have the arresters 22, 24 respectively on opposite sides.
• the plus poles of the pouch cells 20 are on the left side, while the negative poles are on the right side.
• This arrangement of the pouch cells 20 makes it easy to realize a parallel connection of the cells by electrically connecting the upper arresters 22 via a connector 26 and also electrically connecting the lower arresters 24 to a connector 26.
• the cell composite 30 shown adjacent has the electrically interconnected Pouch cells 20, which in turn are zigzagged superimposed.
• a series connection of Pouch cells 20 is shown, in which the arresters - as before - are provided on opposite sides of a cell.
• the pouch cells 20 are placed here so that there are plus and minus poles of two adjacent Pouch cells on the facing sides (front and back).
• positive and negative poles of two adjacent pouch cells 20 can be easily electrically connected to each other via a connector 26.
• the cell composite 32 of the serially connected pouch cells 20 is again achieved by zigzag superimposing the cells.
• the exemplified four cell composites 32 not conclusively show all possibilities. Rather, it is of course also possible to fold or stack the pouch cells lying in a row in a different manner, for example by always folding after two or more cells, so that the cell composite then consists of two or more stacks ,
• the processing system 10 shown in Fig. 1 is designed to produce the aforementioned cell composites from individual pouch cells.
• the processing installation has a transport system 40, which transports the workpiece carrier 42 from a starting point A to an end point B.
• transport system 40 is shown as a single system in the processing plant shown in Figs. 1, 4, the transport system may also be comprised of a plurality of interlinked transport systems.
• the transport system 40 may be a commercially available transport system for assembly systems, wherein particularly preferably a transport system 40 is used, the workpiece carrier 42 can drive individually via linear motors.
• the transport system 40 shown here has two mutually parallel guideways 44, which are each formed as a closed path, so that forms a transport plane and an underlying return transport plane.
• the workpiece carriers 42 are guided in the guideways 44 on the two transverse sides and are driven by linear motors integrated in the guideways.
• the individual workpiece carriers 42 preferably each receive a single pouch cell 20 and guide them from point A through the processing system 10 to the end point B where the pouch cells are removed. During transport from A to B, various processing steps are carried out on the pouch cells, which will be discussed below.
• the pouch cells 20 provided in a plurality of magazines 28 are removed from the magazines 28 via a handling system 50 and placed on a workpiece carrier 42.
• the handling system 50 has a vacuum suction head 52.
• a gripping arm is also conceivable.
• pouch cells 20 are provided in a first processing area 60 with electrical connectors 26, which are preferably unwound from rollers. These connectors 26 are placed on the adjuncts of adjacent pouch cells, as shown in the examples in FIG. Since the pouch cells 20 to be populated lie in one plane, this processing step can be carried out very easily via corresponding handling systems.
• the connectors 26 are electrically connected to the corresponding Abieitern, wherein as a connection process different options are available. For example, it is conceivable to weld the connector to the Abieiter.
• a welding unit 64 which has a welding head 65 which drives against the connector and the arrester from above.
• a counterhold corresponding elements 66 are provided below the pouch cell or the transport plane.
• the workpiece carriers are transported step by step through this work area 62, so that in turn the pouch cells can be electrically connected to each other.
• process steps can subsequently follow in the direction of transport up to the end B of the processing plant. Due to the location of the pouch cells, which lie in one plane on workpiece carriers, process steps can be carried out on each individual pouch cell, regardless of whether, for example, the top side or the bottom side of the pouch cell is to be processed.
• Such additional process steps may be, for example: curing of applied materials, such as a conductive adhesive for connection between connector 26 and absorber 22, 24, by UV light, air, heat, etc .; an in-line examination of the pouch cells, for example checking of the contacting, testing of contact resistance, testing of other cell parameters; an identification of the pouch cells, for example by laser, label, inkjet or labeling; Application of cooling pads, spacers or similar elements;
• Layup i. Recording and / or handling of the interconnected Pouch cells, which form a laminar network of cells.
• an inline inspection unit 70 is exemplified, which checks, for example, the contacting quality between connector and Abieiter.
• a planar composite of pouch cells is provided, which can be further processed in different ways.
• a folding and stacking unit 80 is provided, which removes the connected pouch cells 20 from the workpiece carriers 42 and places them on a table 82.
• This table 82 is displaceable in height, being moved gradually downwards for easier stacking of the pouch cells.
• this pouch cell stack or cell composite can be removed from the processing system and fed to further processing.
• Fig. 3 a portion of the processing system 10 is shown again in detail.
• the counter-holders 66 are clearly visible, which interact with a welding head 65 of the welding unit 64.
• the welding head 65 itself can be moved in all three directions.
• a workpiece carrier 42 is formed from two workpiece carrier elements 46.
• the two workpiece carrier elements 46 are crossbeam elements that span the area between the two guide tracks 44 and are laterally connected to the guide rail. railways 44 are supported and managed.
• a longitudinally extending longitudinal element is provided on this cross member, which extends to the associated second workpiece carrier element.
• the rear workpiece carrier element 46 has a longitudinal element which extends to the front (in the transport direction), while the other workpiece carrier element 46 has a longitudinal element which is against the transport direction to the rear runs and additionally offset (transverse to the longitudinal direction) to the other longitudinal element.
• the respective longitudinal elements can engage in the embodiment shown in corresponding recesses or grooves of the respective opposite associated workpiece carrier element, so that then the longitudinal elements are also supported at the free end.
• two workpiece carrier elements can each form a workpiece carrier 42, which is variable in its longitudinal extent.
• the drive of the workpiece carrier elements can - as previously mentioned - done via linear motors. However, other drive techniques can be used. In addition, of course, classic workpiece carriers that form a single unit can be used. Finally, it should be noted that the transport or transfer system can be chosen arbitrarily as a whole and the system shown and described in FIG. 1 represents one of many possibilities.
• a plurality of already interconnected Pouch cells 20 are shown in more detail. Good to see the respective connector 26, which connect two different poles of adjacent Pouch cells. This arrangement corresponds to the series connection of several pouch cells explained with reference to FIG. 2.
• the "in-line processing" of the pouch cells in the processing system 10 also makes it possible, for example, to provide each individual pouch cell with a battery management system.
• This battery management system is - as shown in Fig. 4 - placed between the two Abieiter a Pouch cell and electrically connected to the two Abieitern 22, 24.
• the battery management system 90 can thus check, for example, the cell voltage.
• a processing system 10 ' is shown, which essentially corresponds to the processing system 10 of FIG. On the marked with the same reference numerals elements will therefore not be discussed further.
• the difference from FIG. 1 is the transport system 40 used. While in FIG. 1 workpiece carriers 42 transport the pouch cells, a conveyor belt 43 is provided in the processing system 10 'of FIG. On this conveyor belt 43, the Pouch cells are placed one after the other by means of the handling system 52, so that they are transported lying in a row and in a transport plane through the processing area.
• mechanical fixing elements can be provided on the conveyor belt.
• a vacuum system may be provided that sucks the pouch cells via suction openings on the conveyor belt 43 and thus holds.
• the processing system 10 or 10 'and the method executed thereon for processing pouch cells are described.
• other particularly flat-structure energy storage cells can be processed with this method.
• the method is particularly advantageous.
• the processing system 10 and in particular the method executed thereon allows electrical connection / contacting of the connectors with the Abieitern in high quality. Problems due to contacting errors can thus be significantly reduced.
• the in-line processing method on the processing unit 10 allows for further processing or process steps that can be performed on the individual pouch cells. Each pouch cell is readily accessible from top or bottom to final stacking.

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Citations (4)

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• 2014
  • 2014-01-20 DE DE102014100574.0A patent/DE102014100574A1/de not_active Withdrawn
• 2015
  • 2015-01-19 WO PCT/EP2015/050892 patent/WO2015107194A1/de active Application Filing

Patent Citations (4)

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