EP2727172A1 - Dispositif d'accumulation électrique - Google Patents

Dispositif d'accumulation électrique

Info

Publication number
EP2727172A1
EP2727172A1 EP12733022.3A EP12733022A EP2727172A1 EP 2727172 A1 EP2727172 A1 EP 2727172A1 EP 12733022 A EP12733022 A EP 12733022A EP 2727172 A1 EP2727172 A1 EP 2727172A1
Authority
EP
European Patent Office
Prior art keywords
cell
storage device
connection
clinching
poles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12733022.3A
Other languages
German (de)
English (en)
Inventor
Martin Michelitsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AVL List GmbH
Original Assignee
AVL List GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AVL List GmbH filed Critical AVL List GmbH
Publication of EP2727172A1 publication Critical patent/EP2727172A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
    • 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
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6553—Terminals or leads
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/298—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the wiring of battery packs
    • 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
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • 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
    • H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
    • H01M50/522—Inorganic material
    • 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
    • H01M50/543—Terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0267—Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • 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
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/512—Connection only in parallel
    • 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
    • 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
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the invention relates to an electrical storage device, in particular secondary battery, in particular high-voltage battery, preferably for an electric vehicle, with at least one stack of juxtaposed memory cells, wherein at least two cell poles of adjacent memory cells - preferably electrically interconnected by at least one cell connector -, wherein the Connection between at least one cell pole and the cell connector and / or between at least one cell pole and at least one bus bar and / or formed directly between two cell poles by at least one preferably cold-pressed surface Versteck spageitati.
  • High-voltage batteries usually have battery packs with memory cells arranged in series, for example lithium-ion memory cells, wherein the cell poles are electrically connected to one another by cell connectors which are connected to the cell poles by means of a laser welding connection. Due to the electrochemical material properties, the two cell poles of each battery cell usually consist of different materials, which makes connection technology more difficult. In the laser welding process which is very frequently used, the cell pole sheets protruding from the cell chemistry (usually Cu or Al) are welded together with an additional bi-metal cell connector (for example aluminum sheet or copper sheet via a compaction process). A direct welding of two different materials is technically extremely complicated and complicates the already complex to monitor and complex laser welding process.
  • a storage device with a plurality of flat, substantially plate-shaped battery single cells is known.
  • the battery cells are stacked into a cell stack and surrounded by a battery case.
  • the battery single cells are formed in frame flat construction with metallic sheets and a frame made of insulating material.
  • WO 2008/048751 A2 also discloses a battery module having a multiplicity of plate-shaped memory cells arranged side by side in a stack, which are accommodated in a housing.
  • WO 2010/053689 A2 describes a battery arrangement with a housing and a plurality of lithium-ion cells, which are arranged next to one another are.
  • the housing is flowed through for cooling with a thermally conductive, electrically insulating fluid.
  • DE 27 05 050 A1 describes a battery structure having at least one galvanic cell, which has a positive and a negative battery terminal and a positive and negative spiral wound into a cylindrical shape electrode material, wherein the connection between the electrode material with the poles via a mechanical point contact Connection takes place.
  • a prismatic accumulator with several cell vessels wherein in each cell vessel, a plate stack is added.
  • Contact connecting plates each extend along the intermediate walls of the cell vessel between the plate stacks, the contact connecting plates opposite an intermediate wall in each case being conductively connected to one another via the intermediate wall and the contacts of the plate stacks being electrically conductively connected by welding to the associated contact connector plates.
  • the connection of contact connection plates through the intermediate wall is formed as a cold-pressed-through clinching connection.
  • WO 2011/144372 A1 describes a lithium-ion battery cell and a method for producing an electrically conductive contacting of terminals of battery cells, wherein the terminals with a joining process, for example, a clinching process are connected electrically contacting each other.
  • the object of the invention is to avoid the disadvantages mentioned, and to simplify the manufacture of a rechargeable electrical storage device of the type mentioned.
  • At least one cell connector has a U-profile or Y-profile.
  • the connection between at least one cell pole and at least one cell connector and / or between at least one cell pole and at least one bus bar and / or directly between two cell poles is formed by at least one cold junction pressed-through connection, wherein preferably each clinching connection has a plurality of joining points arranged next to one another.
  • the joining points can be arranged in several parallel rows, wherein the joint points of at least two juxtaposed rows can be arranged offset from one another.
  • the joining points may have a round - for example, circular or oval - or angular - for example, rectangular or triangular - have ground plan.
  • a round floor plan without cutting share a three-axis deformation state and thus a tearing of the material can be avoided. Furthermore, a round floor plan without sharp edges is more corrosion-resistant compared to an angular floor plan and - due to the better water and gas tightness - more corrosion-resistant, which is particularly important for the electrical connection. Gas tightness is of particular importance in electrical connections to improve aging and corrosion resistance.
  • At least one joining point may have a structure.
  • the material load can be minimized.
  • the joining points can be arranged in a 2x4 matrix arrangement.
  • the clinching connection can be performed in the cold or heated or heated state.
  • At least one cell connector is formed by the cell poles of interconnected cell poles.
  • At least one cell connector is formed by a cell connector element different from the cell poles.
  • the separate cell connector elements create additional surfaces, which can improve heat exchange.
  • the cell connector element has a U-profile or Y-profile with partially parallel legs, the mechanical stress on the memory cells can be kept very low, since the parallel upwardly projecting flags of the cell poles do not have to be bent.
  • the parallel aligned flags of the cell poles remain the same length throughout the joining process, thus more than two cell poles - such as several cell connector elements with U-profile and / or Y-profile - are connected to each other without the flags subsequently brought to the same length Need to become.
  • Setzhegevorgang the clinching normally attack the parts to be enforced, thus no shear forces are introduced into the memory cells.
  • cell connectors with U-profile and Y-profile are arranged alternately between successive memory cells.
  • U-shaped cell connectors (bus bar, busbars) parallel circuits of memory cells are possible, wherein two Gleichpolige Zelltaps of two memory cells via a busbar (U-shaped busbar) with two further memory cells are connected to the respective opposite pole.
  • Parallel circuits of memory cells are also possible directly through the respective opposing poles, with the same pole cell poles of two memory cells with two further memory cells being connected to the respective opposite pole (for example 1S2P: 1x serial, 2x parallel).
  • a cell voltage tap on cell voltage leaves can additionally be used as a measuring tap for the cell voltage measurement.
  • At least two cell poles of adjacent memory cells are connected directly to one another by at least one clinching connection and form a preferably Y-shaped cell connector.
  • the clinching connection is sealed gas-tight, resulting in a corrosion-resistant long-term connection.
  • At least one cell pole may have a galvanization layer, preferably a nickel coating.
  • two or more sheets are plastically deformed by a tool punch and a tool die, creating a positive fit between the sheets.
  • these are connected to each other in a single operation, depending on the type of wiring chosen (for example, two sheets in series connection or three or four sheets in a parallel connection of two memory cells with cell connectors and cell voltage monitoring cables), whereby simultaneously using multiple tools multiple joint points (clinching) on a Zellpolvert (cell pile) or on several Zellpolversen can be set.
  • the harder material should always be aligned on the punch side and the softer material on the die side of the clinch tool.
  • the softer material can be more deformed, so that a good deformation can take place in the outer region of the joint point and a strong connection is formed.
  • the multiple joining points allow high current carrying capacity.
  • the clinch connection allows easy contacting of the cell poles with different materials (eg, copper to aluminum or vice versa) without the need for additional components. Furthermore, the connection of and with non-metallic materials with conductive alloys is possible.
  • At least one cell pole may be connected to at least one voltage tapping element, preferably by means of a clinching connection.
  • a voltage tapping element in the form of a leaflet which carries at least one cable for the cell voltage tap, may be included in the voltage tapping.
  • connections for a monitoring unit and / or thermal sensors or the like can be mitg clinter.
  • the bus bar can also act as a cell voltage tapping plate at the same time.
  • At least two cell poles may have different thicknesses, wherein preferably at least one cell pole may consist of several interconnected cell collagen.
  • an electrically non-conductive joining tool should be used, in particular in parallel joining operations.
  • a big advantage of clinch joints is that the joint points can be visually inspected.
  • Another advantage over thermal joining methods such as welding or soldering is that no heat in the memory cells is entered. A force entry into the memory cells is avoided.
  • At least one clinching connection is arranged in a cooling air channel, wherein preferably the clinching connection has at least one joining point projecting into the cooling air flow of the cooling air channel.
  • the protruding joining points increase the relevant surface area for cooling, for example in the case of direct air cooling of the cell poles.
  • the protruding joining points also act to increase turbulence, which has an advantageous effect on the heat transport during air cooling. Efficient component utilization can thus increase the volumetric energy density of the storage device.
  • the U-shaped cell connector has at least one mounting opening in an area spanning at least two cell poles, wherein preferably the penetration connection is arranged between the mounting opening and the memory cell.
  • the invention is suitable for primary batteries, secondary batteries, fuel cells and capacitors and combinations thereof.
  • FIG. 1 shows a memory device according to the invention in an oblique view from above.
  • Fig. 2 shows the memory device in a section along the line II - II in
  • FIG. 5 shows a storage device module of the storage device in a
  • FIG. 6 shows this storage device module in a view from below;
  • FIG. 7 shows a stack of memory cells in an oblique view; 8 shows this stack in a side view;
  • FIG. 10 shows a stack of memory cells in a section according to the line X.
  • FIG. 11 shows a detail of this stack in a section analogous to FIG. 10;
  • FIGS. 12 to 14 show details of a stack in various design variants in oblique views
  • Fig. 15 shows a stack in a further embodiment in a
  • Fig. 16 shows a detail of a stack in another embodiment in a
  • Fig. 17 shows a stack in a further embodiment in a
  • Fig. 18 is a detail of this stack
  • Fig. 20 is a joining point of a clinching in a first connection
  • Fig. 22 the joining point of Fig. 20 in detail in section.
  • the storage device 1 formed, for example, by a secondary battery has in the exemplary embodiment seven storage device modules 2, each storage device module 2 having two stacks 3, 4 of juxtaposed and tensioned storage cells 5.
  • the stacks 3, 4 of each storage device module 2 are between two structurally stiff corrugated plates 6 made of metal, for. As aluminum, or plastic, arranged, wherein the plates 6 may be formed by die castings.
  • the plates 6 themselves are between two holding plates 7, 8 clamped to the front and back of the memory device 1, wherein the holding plate 7 is fixedly connected at the front via clamping screws 9 with the holding plate 8 at the back.
  • the clamping screws 9 are each arranged in the region of the plates 6.
  • the plates 6 together with the holding plates 7, 8 form a holding frame 10 for the storage device modules 2.
  • the holding plates 7, 8 have openings in order to keep the weight as low as possible.
  • the - seen in the stacking direction y - defined distance between the clamping screws 9 ensures that the memory cells 5 are installed in the correct position and with certain and over the life of the memory device 1 substantially invariable bias.
  • an elastic insulating layer 6a for example of a foam, arranged, which allows a uniform and gentle pressure distribution.
  • the storage device 1 together with the holding frame 10 is arranged in a housing 12, wherein between the housing 12 and the storage device 1 cooling air flow paths are formed.
  • To guide the flow of cooling air flow guide surfaces 13 are incorporated into the housing bottom 12a, as shown in FIG. 2 and 4 can be seen.
  • Each storage cell 5 is surrounded by a plastic sleeve 14, wherein the plastic sleeve 14 approximately in the region of a cell center plane 15 along the narrow side 5a has a protruding seal seam 16 for sealing. Between the sealing seams 16 of two adjacent memory cells 5 of a stack 3, 4 a free space 17 is spanned in each case.
  • the two juxtaposed stacks 3, 4 of each storage device module 2 are offset and formed overlapping each other.
  • the offset V amounts to approximately half the thickness D of a memory cell 5.
  • the sealing seams 16 of a memory cell 5 of the one stack 3, 4 protrude into a free space 17 spanned by sealing seams 16 of two adjacent memory cells 5 of the other stack 4, 3.
  • the free space 17 can be used at least partially by accommodating part of the sealing seams 16. This has a very beneficial effect on the size of the installed space and on the volumetric energy density.
  • the offset v between the two stacks 3, 4 causes the plates 6 form a step 24 in the region of a longitudinal center plane la of the storage device 1.
  • two to four sheets can be electrically connected to each other, with the materials copper, aluminum and steel, in particular, being suitable for wall thicknesses of 0.1 mm to 0.5 mm.
  • cell voltage monitoring cables 22 for example by means of cell voltage leaves to which a cable is made-can thus be connected to the cell poles 18 in a clinching operation in one step simultaneously with the cell connectors 19, 20.
  • the same tool can be used for the same total thicknesses. Since the position of the joining points 21a of the clinching joint 21 is allowed to scatter more than, for example, a laser welding connection, a relatively high tolerance compensation capability results.
  • joining points 21a By projecting into the cooling air channel 27 joining points 21a, the heat-dissipating surface of the storage device 1 is increased, which is particularly important in direct air cooling of the cell poles 18 of importance.
  • the protruding joining points 21a also contribute to the increase in turbulence, which improves the heat transport, in particular in the case of air cooling. By virtue of their positive effect on the cooling, joining points 21a thus also contribute to increasing the volumetric energy density through efficient use of space.
  • a very thin, thermal and electrical insulator layer 23 for example an insulating film, is arranged between the memory cells 5 in order to avoid the occurrence of a "domino effect" in the case of a thermal overload of an adjacent memory cell 5.
  • the free spaces 17 at the same time form cooling air channels 26, 27.
  • the sealing seams 16 thereby form flow guide surfaces for the air flow and heat-dissipating surfaces.
  • second cooling air channels 27 in the region of the cell poles 18 are formed by the free spaces 17 at the top of the memory cells 5.
  • the first and second cooling air channels 26, 27 are part of a closed cooling air circuit 28 for cooling the storage device 1, wherein the cooling air circuit 28 has at least one cooling air blower 29 and at least one heat exchanger 30.
  • the cooling air is - coming from the cooling air blower 29 and the heat exchanger 30 - in the housing 12 in the region of the holding plate 9 at the rear and / or top of the storage device 1 or in the region of the cell poles 18 supplied.
  • the cooling air flows through the second cooling air channels 27 and cools cell poles 18 and cell connectors 19, 20. Thereafter, at least a portion of the cooling air passes into the first cooling air channels 26, which lead the cooling air counter to the vertical axis z down.
  • FIG. 12 shows a section of a stack 3, the cell poles 18 of two adjacent memory cells 5, which take over the function of the cell connectors 20, being connected electrically in series.
  • the cell connectors 20 are thus formed by the Y-shaped bent and interconnected by a clinching connection (clinching) 21 cell poles 18 itself.
  • the two cell poles 18 are clinched together with a vesicular voltage tapping element 31.
  • a cell pole 18 or cell arrester is connected to the opposite pole of the adjacent memory cell 5.
  • FIGS. 13 and 14 show alternative embodiments, each with a parallel connection of memory cells 5, wherein two homopolar cell poles 18 together with two further memory cells 5 can be connected to a counter pole and a voltage tap element 31.
  • FIGS. 15 and 16 show a further embodiment variant of a stack 3 of memory cells 5, memory cells 5 having U-shaped cell connectors 19 or busbars being connected to one another. In this case, homopolar cell poles 18 of two memory cells 5 are connected via a U-shaped cell connector 19 (busbar, bus bar) with another two memory cells 5 to the opposite pole.
  • the busbar can simultaneously act aschrosabgriffelement.
  • a U-shaped cell connector may also provide the capability of interfacing with cell monitoring test leads.
  • aaccosabgriffselement 31 is shown as provided on the U-profile plug-in lug for tabs with cable 22.
  • a soldering with the line can be carried out.
  • a connection can be established via resistance welding, ultrasonic compacting welding, or via a screw connection to the flag.
  • the cell monitoring measuring lines are guided at current energy stores with lithium cells from each memory cell 5 to a monitoring unit.
  • This monitoring unit measures the individual cell voltages. In most cases, it can also balance cell voltage inequalities.
  • FIG. 16 shows a further connection possibility for the cell monitoring measuring lines by means of coincident voltage tapping elements 31.
  • Fig. 17 and Fig. 18 show a variant with upside down, so with downwardly open legs 19a on the cell poles 18 patch U-shaped cell connectors 19.
  • mounting holes 35 provided through which the clinching forceps introduced and thus the clinching connection 21 can be performed.
  • Fig. 19 shows a clinching connection 21 with two staggered rows of circular joining points 21a.
  • the minimum requirement for sufficient current monitoring with minimal heat loss in this example are four joint points 21a.
  • eight joint points 21a are arranged offset in two rows.
  • a peeling stress, which in Fig. 19 can be acted upon from below, is intercepted by the lower row, so that the second row is not mechanically stressed and thus does not affect the electrical conductivity.
  • Fig. Fig. 20 shows an example of a clinching joint 21 having a substantially circular outline. In Fig. 21, by contrast, a clinching connection 21 is shown with a rectangular plan.
  • the process of single-stage clinching with opening die 32 consists of the following steps (see FIG. 22):
  • the overlapping sheets A, B are plastically deformed by a punch 33 and pressed into a die cavity.
  • the die wall 34 usually two or four parts, remains closed.
  • an undercut Cl (see FIG. 22) of the joined materials is generated.
  • the undercut Cl, the neck width Sl, and the residual ground thickness ST, are features of the quality of the connection.
  • the result of the clinching process is a visually pleasing, high strength and reproducible connection.
  • the harder material B should always be aligned with the punch side and the softer material A on the side of the anvil 35 of the die 32.
  • the softer material A can be more deformed so that good deformation of the outside "bottom” can take place and a resilient clinching joint 21 is created.
  • the invention has been described with reference to a memory device 1 formed by a secondary battery.
  • the storage device 1 can also be formed by a primary battery, a fuel cell or a capacitor.

Abstract

La présente invention concerne un dispositif d'accumulation électrique (1), notamment une batterie secondaire, en particulier une batterie haute tension de préférence destinée à un véhicule électrique, comportant au moins un empilement (3, 4) d'éléments d'accumulation (5) disposés en rangée, au moins deux pôles d'éléments (18) d'éléments d'accumulation adjacents (5) étant de préférence connectés électriquement par au moins un connecteur d'éléments (19, 20), la connexion entre au moins un pôle d'élément (18) et le connecteur d'éléments (19, 20) et/ou entre au moins un pôle d'élément (18) et au moins une barre conductrice et/ou directement entre deux pôles d'éléments (18) étant réalisée par au moins une connexion d'assemblage par pression (21). Pour une fabrication simple, au moins un connecteur d'éléments (19, 20) présente un profil en U ou en Y.
EP12733022.3A 2011-06-30 2012-06-26 Dispositif d'accumulation électrique Withdrawn EP2727172A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA956/2011A AT511667B1 (de) 2011-06-30 2011-06-30 Wiederaufladbare elektrische batterie
PCT/EP2012/062309 WO2013000889A1 (fr) 2011-06-30 2012-06-26 Dispositif d'accumulation électrique

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EP (1) EP2727172A1 (fr)
JP (1) JP2014524107A (fr)
KR (1) KR20140041716A (fr)
CN (1) CN103891004A (fr)
AT (1) AT511667B1 (fr)
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AT511667B1 (de) 2015-07-15
AT511667A1 (de) 2013-01-15
JP2014524107A (ja) 2014-09-18
WO2013000889A9 (fr) 2013-02-28
KR20140041716A (ko) 2014-04-04
WO2013000889A1 (fr) 2013-01-03
US20140154602A1 (en) 2014-06-05
DE112012002697A5 (de) 2014-03-20
CN103891004A (zh) 2014-06-25

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