WO2010079295A2 - Power storage device, particularly for fitting on an automobile - Google Patents

Power storage device, particularly for fitting on an automobile Download PDF

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Publication number
WO2010079295A2
WO2010079295A2 PCT/FR2010/050005 FR2010050005W WO2010079295A2 WO 2010079295 A2 WO2010079295 A2 WO 2010079295A2 FR 2010050005 W FR2010050005 W FR 2010050005W WO 2010079295 A2 WO2010079295 A2 WO 2010079295A2
Authority
WO
WIPO (PCT)
Prior art keywords
terminals
electrical connection
cells
energy storage
cell
Prior art date
Application number
PCT/FR2010/050005
Other languages
French (fr)
Other versions
WO2010079295A3 (en
Inventor
Fabien Guerin
Roger Abadia
Alexis Hosni
Jean-Philippe Badey
Romaric Lenoir
Hugues Gervais
Original Assignee
Valeo Equipements Electriques Moteur
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 Valeo Equipements Electriques Moteur filed Critical Valeo Equipements Electriques Moteur
Publication of WO2010079295A2 publication Critical patent/WO2010079295A2/en
Publication of WO2010079295A3 publication Critical patent/WO2010079295A3/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
    • B23K26/0626—Energy control of the laser beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/28—Seam welding of curved planar seams
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • B23K2103/10—Aluminium or alloys thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/18—Dissimilar materials
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the invention relates to a device for storing electrical energy, in particular for equipping a motor vehicle.
  • such a power storage device is for example arranged to be loaded during a regenerative braking phase and discharged during vehicle start-up and acceleration phases.
  • the patent application EP 1 058 332 discloses a plurality of rechargeable batteries assembled in series using parts interposed between two neighboring batteries. Among these parts are a perforated perforated plate and an insulating ring. This assembly is relatively complex to perform, requiring several operations, and relatively bulky, especially in the axial direction, due to the plurality of intermediate parts placed between the batteries.
  • the invention aims in particular to overcome the aforementioned drawbacks.
  • the subject of the invention is thus a device for storing energy, in particular for equipping a motor vehicle, comprising at least two energy storage cells, each cell comprising at least one electrical connection terminal, the device being characterized by the make that
  • the energy storage cell comprises a supercapacitor comprising in an interior space a structure electrochemical, and the electrical connection terminal is part of a wall delimiting the interior space of the cell.
  • the fact of directly welding the terminals of the energy storage cells makes it possible to reduce the number of operations, unlike, for example, the assembly described in the patent application EP 1 058 332 which uses several parts intermediates and requires multiple operations.
  • the absence of an intermediate piece between the cells can reduce the electrical resistance in the junction between these cells.
  • the welding is advantageously performed without adding material, which simplifies the operation.
  • the energy storage cell comprises a body having, on the one hand, at one axial end a bottom and, on the other hand, being closed at the other end by a cover, in particular crimped or welded on the body, and the electrical connection terminal is formed on one of the bottom of the body and the cover.
  • the electrical connection terminal is necessary for the operation of the energy storage cell. Without this terminal, the cell is unusable.
  • the two electrical connection terminals are welded by laser welding.
  • solder trace, or weld bead, on the junction of the two terminals extends over the entire periphery of the terminals.
  • the weld is, if desired, made radially on a cylindrical wall of the electrical connection terminal of the cell, and the weld trace can penetrate, without risk of damaging the cell, further into the thickness of this terminal.
  • the solder trace on the junction of the two terminals preferably ends at a circumferential end with a generally triangular shaped portion, or tip-shaped. To obtain this form of the weld trace, the power of the laser used, at the end of welding, is reduced gradually, so as to generate a fading of this laser.
  • the weld trace on the junction of the two terminals extends over a depth of the terminals of at least 1 mm, in particular about 2 mm.
  • the welded terminals are made of compatible materials for laser welding, in particular the terminals being made of aluminum of different grades.
  • the cover of the cell can be made of aluminum 6000 and the body of the aluminum cell 1000, these aluminum being compatible for laser welding.
  • this spacer may have a cup shape.
  • the spacer is for example placed on one of the terminals to be connected. If desired, the spacer extends over an area substantially equal to that of the end of the associated terminal.
  • the spacer is designed to cap the associated terminal, in particular by covering this terminal on its end and on a side wall.
  • the spacer used between the electrical connection terminals allows, if necessary, an effective weld when the respective terminals are of materials that are not compatible for effective welding directly between them.
  • the cover of the energy storage cell can be made of aluminum 6000, the aluminum spacer 1000, and the body of the 6000 aluminum cell, these aluminum being compatible for laser welding.
  • each energy storage cell has two electrical connection terminals.
  • the device comprises at least two groups each of a plurality of energy storage cells whose connection terminals are welded together, and one of the cells of a group is electrically connected to one of cells of the other group via a connector such as a busbar or busbar.
  • the invention also relates to a method for manufacturing a device for storing electrical energy, in particular for equipping a motor vehicle, comprising at least two energy storage cells, each cell comprising at least one electrical connection terminal, comprising the following step: soldering the electrical connection terminals of the two cells to one another.
  • the two cells are arranged relative to each other keeping the terminals facing each other by means of a centering element cooperating with these terminals .
  • the two cells are rotated.
  • the source of the welding laser that is rotated.
  • the force for rotating the cells is exerted, for example, on cylindrical bodies of the cells, in particular by means of rollers resting on these bodies.
  • the power of the laser used for welding is modulated as a function of time.
  • the invention also relates to a method for manufacturing a device for storing electrical energy, in particular for equipping a motor vehicle, comprising at least two energy storage cells, each cell comprising at least one electrical connection terminal, the method comprising the following step:
  • the invention also relates to a tool for implementing the method defined above, comprising a centering element that can cooperate with the two electrical connection terminals to be welded together, to center one of the terminals relative to the other. , this centering element comprising in particular a triangular slot for receiving the two terminals.
  • the tooling may include at least one rotating wheel for pressing on a body of an energy storage cell to rotate it.
  • FIG. 1 illustrates, schematically and partially, a step of welding two energy storage cells
  • FIG. 2 is a diagrammatic and partial representation along the X axis of a cell of FIG. 1;
  • FIG. 3 is a diagrammatic and partial sectional view of the junction between two terminals soldered by the process of FIG. 1;
  • FIG. 4 is a diagrammatic and partially side view of the junction between two terminals soldered by the process of FIG. 1,
  • FIG. 5 is a schematic and partial sectional view of an energy storage cell
  • FIG. 6 is a curve illustrating the variation, as a function of time, of the power of a welding laser for the process of FIG. 1, and
  • FIG. 1 shows two energy storage cells 2 for an energy storage device 1 of a micro-hybrid motor starter-alternator system.
  • the micro-hybrid system includes a regenerative braking system.
  • the device 1 may for example comprise, in all, six energy storage cells 2, only two of which are shown in FIG.
  • the device 1 may comprise a number of cells other than six, for example being equal to two or ten.
  • Each cell 2 is formed by a supercapacitor or EDLC in English
  • each cell 2 comprises:
  • a body 5 of longitudinal axis X made of grade 1000 aluminum having a cylindrical side wall 6 and a bottom 7, a connection terminal 8 being formed on the bottom 7,
  • a cover 9 made of grade 6000 aluminum, crimped on the body 5 and delimiting therewith an interior space 10, a connection terminal 11 being formed on this cover 9,
  • the plates 13 and 14 can be omitted and the structure 12 is welded directly to the cover 9 and the bottom 7.
  • the cover 9 is an integral part of the cell 2, ie this cover can not be removed under penalty of destroying the cell 2.
  • the two electrical connection terminals 8 and 11 of the two neighboring cells 2 are soldered by laser welding using a laser source 20.
  • the weld trace 21, or weld bead, on the junction 22 of the two terminals 8 and 11 extends around the entire periphery of these terminals (see Figure 4).
  • the weld is made radially on a cylindrical wall 25 of the terminals 8 and 11 of electrical connection, and the weld trace 21 penetrates, without risk of damage to the cell, more in the thickness of these terminals.
  • solder trace 21 on the junction 22 of the two terminals terminates at a circumferential end by a portion 26 in generally triangular shape, or in the shape of a point (see FIG. 4).
  • the portion 26 may have a glossy surface condition.
  • This characteristic shape of the portion 26 is the consequence of the fading of the laser at the end of the welding cycle. This fading corresponds to the gradual reduction of the power of the laser source used for welding.
  • the curve of FIG. 6 shows the evolution of the power of the laser as a function of time during a welding operation.
  • the fading of the laser makes it possible to finish the welding progressively, thus avoiding any risk of creating a hole or crater in the weld that may appear during a sudden and instantaneous extinction of the laser and consequently generate mechanical weakness.
  • the fading of the laser corresponds to the phase E, between the instants t2 and t3, of the curve of FIG. 6.
  • the solder trace 21 on the junction 22 of the two terminals 8 and 11 is extends over a depth e of at least 1 mm, in particular about 2.5 mm, for a terminal diameter of about 14 mm to 16 mm.
  • the welded terminals are made of compatible materials for laser welding, in particular the terminals being made of aluminum of different grades.
  • the two cells 2 Prior to the welding operation, the two cells 2 are arranged relative to one another by keeping the terminals 8 and 11 facing one another by means of a centering element 30 cooperating with these terminals. (see figure
  • This centering element 30 belonging to a tool 33 has a triangular slot 31 for receiving the two terminals 8 and 11.
  • Tooling 33 may further include a plurality of rotary drive wheels 34 for pressing on cylindrical bodies 6 of energy storage cells 2 to rotate them (see Figure 2).
  • the laser source 20 can be stationary, and the rotation of the cells 2 makes it possible to obtain the desired weld.
  • the electrical connection terminals 8 and 11 of the two cells 2 are electrically connected to one another via a spacer. 40 interposed between the two terminals and soldered to these two terminals.
  • the spacer 40 has a cup shape.
  • This spacer 40 is 'transparent' welded to terminal 8 or 11 (see FIG. 7).
  • this spacer 40 is welded 'edge to edge' on the other terminal 8 or 11 (see Figure 8).
  • the terminals 8 and 11 have the same diameter.
  • the spacer 40 extends over an area substantially equal to that of the end of the associated terminal 11
  • the spacer 40 allows, where appropriate, an effective weld when the respective terminals are of materials that are not compatible for effective welding directly between them. This spacer 40 is then made of a material compatible for welding with the two associated terminals 8 and 11.
  • the spacer 40 comprises a bottom 41 welded to the terminal 11 by an axial weld by a laser beam parallel to the axis X.
  • the spacer 40 is welded to the other terminal 8 by a weld radial by a beam perpendicular to the X axis.
  • the spacer 40 is arranged to cover the associated terminal 11, covering this terminal on its end and on a side wall 25.
  • the terminal 8 has a diameter greater than that of terminal 11 (for example 16 mm and 14 mm respectively), while in the example of Figures 7 and 8, the terminals 8 and 11 have identical diameters, for example 14 mm.
  • cells 2 may comprise a Li-On (Lithium-Ion), Ni-Mh (Nickel-Metal Hydride) or Lead battery.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention relates to a power storage device (1), particularly for fitting on an automobile, comprising at least two power storage cells (2), each cell comprising at least one electrical connection terminal (8; 11), characterized in that: either the electrical connection terminals of the two cells are welded together; or the electrical connection terminals of the two cells are electrically connected to each other by means of a spacer interposed between the two terminals and welded to said two terminals.

Description

Dispositif de stockage d'énergie, notamment pour équiper un véhicule automobile Energy storage device, in particular for equipping a motor vehicle
L'invention concerne un dispositif de stockage d'énergie électrique, notamment pour équiper un véhicule automobile.The invention relates to a device for storing electrical energy, in particular for equipping a motor vehicle.
De manière connue, un tel dispositif de stockage d'énergie est par exemple agencé pour être chargé lors d'une phase de freinage récupératif et déchargé lors de phases de démarrage et d'accélération du véhicule.In known manner, such a power storage device is for example arranged to be loaded during a regenerative braking phase and discharged during vehicle start-up and acceleration phases.
On connaît par la demande de brevet EP 1 058 332 une pluralité de batteries rechargeables assemblées en série à l'aide de pièces interposées entre deux batteries voisines. Parmi ces pièces figurent une plaque ajourée conductrice et un anneau isolant. Cet assemblage est relativement complexe à réaliser, nécessitant plusieurs opérations, et relativement encombrant, notamment dans le sens axial, du fait de la pluralité de pièces intermédiaires placées entre les batteries.The patent application EP 1 058 332 discloses a plurality of rechargeable batteries assembled in series using parts interposed between two neighboring batteries. Among these parts are a perforated perforated plate and an insulating ring. This assembly is relatively complex to perform, requiring several operations, and relatively bulky, especially in the axial direction, due to the plurality of intermediate parts placed between the batteries.
L'invention vise notamment à remédier aux inconvénients précités. L'invention a ainsi pour objet un dispositif de stockage d'énergie, notamment pour équiper un véhicule automobile, comportant au moins deux cellules de stockage d'énergie, chaque cellule comportant au moins une borne de raccordement électrique, le dispositif étant caractérisé par le fait queThe invention aims in particular to overcome the aforementioned drawbacks. The subject of the invention is thus a device for storing energy, in particular for equipping a motor vehicle, comprising at least two energy storage cells, each cell comprising at least one electrical connection terminal, the device being characterized by the make that
- soit les bornes de raccordement électrique des deux cellules sont soudées l'une à l'autre, - soit les bornes de raccordement électrique des deux cellules sont reliées électriquement l'une à l'autre par l'intermédiaire d'une entretoise interposée entre les deux bornes et soudée à ces deux bornes, les cellules étant notamment disposées de manière coaxiale, - et la cellule de stockage d'énergie comporte un supercondensateur comprenant dans un espace intérieur une structure électrochimique, et la borne de raccordement électrique fait partie d'une paroi délimitant l'espace intérieur de la cellule.either the electrical connection terminals of the two cells are welded to each other, or the electrical connection terminals of the two cells are electrically connected to one another via a spacer interposed between the two terminals and soldered to these two terminals, the cells being in particular arranged coaxially, and the energy storage cell comprises a supercapacitor comprising in an interior space a structure electrochemical, and the electrical connection terminal is part of a wall delimiting the interior space of the cell.
Grâce à l'invention, le fait de souder directement les bornes des cellules de stockage d'énergie permet de réduire le nombre d'opérations, contrairement par exemple à l'assemblage décrit dans la demande de brevet EP 1 058 332 qui utilise plusieurs pièces intermédiaires et nécessite de multiples opérations.Thanks to the invention, the fact of directly welding the terminals of the energy storage cells makes it possible to reduce the number of operations, unlike, for example, the assembly described in the patent application EP 1 058 332 which uses several parts intermediates and requires multiple operations.
Le cas échéant, une seule opération de soudure peut suffire pour réaliser la connexion entre les deux cellules.If necessary, a single welding operation may be sufficient to make the connection between the two cells.
En outre, l'absence de pièce intermédiaire entre les cellules peut permettre de réduire la résistance électrique dans la jonction entre ces cellules.In addition, the absence of an intermediate piece between the cells can reduce the electrical resistance in the junction between these cells.
La soudure est avantageusement réalisée sans apport de matière, ce qui permet de simplifier l'opération.The welding is advantageously performed without adding material, which simplifies the operation.
Avantageusement la cellule de stockage d'énergie comporte un corps ayant, d'une part, à une extrémité axiale un fond et, d'autre part, étant fermé à l'autre extrémité par un couvercle, notamment serti ou soudé sur le corps, et la borne de raccordement électrique est formée sur l'un du fond du corps et le couvercle.Advantageously, the energy storage cell comprises a body having, on the one hand, at one axial end a bottom and, on the other hand, being closed at the other end by a cover, in particular crimped or welded on the body, and the electrical connection terminal is formed on one of the bottom of the body and the cover.
Dans la présente invention, la borne de raccordement électrique est nécessaire au fonctionnement de la cellule de stockage d'énergie. Sans cette borne, la cellule est inutilisable. Dans un exemple de mise en oeuvre de l'invention, les deux bornes de raccordement électrique sont soudées par soudure laser.In the present invention, the electrical connection terminal is necessary for the operation of the energy storage cell. Without this terminal, the cell is unusable. In an exemplary implementation of the invention, the two electrical connection terminals are welded by laser welding.
Avantageusement la trace de soudure, ou cordon de soudure, sur la jonction des deux bornes s'étend sur tout le pourtour des bornes.Advantageously the solder trace, or weld bead, on the junction of the two terminals extends over the entire periphery of the terminals.
La soudure est, si on le souhaite, réalisée radialement sur une paroi cylindrique de la borne de raccordement électrique de la cellule, et la trace de soudure peut pénétrer, sans risque de dommage de la cellule, davantage dans l'épaisseur de cette borne.The weld is, if desired, made radially on a cylindrical wall of the electrical connection terminal of the cell, and the weld trace can penetrate, without risk of damaging the cell, further into the thickness of this terminal.
Ceci est avantageux par rapport au cas où la soudure serait réalisée dans une direction axiale car une trop grande pénétration du laser peut provoquer une perforation de la cellule, et donc une destruction de celle-ci. La trace de soudure sur la jonction des deux bornes se termine de préférence à une extrémité circonférentielle par une portion en forme généralement triangulaire, ou en forme de pointe. Pour obtenir cette forme de la trace de soudure, la puissance du laser utilisé, en fin de soudure, est réduite progressivement, de manière à générer un évanouissement de ce laser.This is advantageous with respect to the case where the welding would be performed in an axial direction because excessive penetration of the laser can cause perforation of the cell, and therefore destruction thereof. The solder trace on the junction of the two terminals preferably ends at a circumferential end with a generally triangular shaped portion, or tip-shaped. To obtain this form of the weld trace, the power of the laser used, at the end of welding, is reduced gradually, so as to generate a fading of this laser.
Ceci permet d'éviter le risque de créer une amorce de rupture, telle un trou, au niveau de la jonction des bornes soudées dans le cas où le laser est arrêté instantanément et la trace de soudure s'interrompt brutalement.This makes it possible to avoid the risk of creating a fracture initiation, such as a hole, at the junction of the welded terminals in the case where the laser is stopped instantaneously and the weld trace stops abruptly.
Le cas échéant, la trace de soudure sur la jonction des deux bornes s'étend sur une profondeur des bornes d'au moins 1 mm, notamment d'environ 2mm.If necessary, the weld trace on the junction of the two terminals extends over a depth of the terminals of at least 1 mm, in particular about 2 mm.
De préférence, les bornes soudées sont réalisées dans des matériaux compatibles pour une soudure laser, notamment les bornes étant réalisées en aluminium de grades différents.Preferably, the welded terminals are made of compatible materials for laser welding, in particular the terminals being made of aluminum of different grades.
Par exemple, le couvercle de la cellule peut être réalisé en aluminium 6000 et le corps de la cellule en aluminium 1000, ces aluminiums étant compatibles pour la soudure laser.For example, the cover of the cell can be made of aluminum 6000 and the body of the aluminum cell 1000, these aluminum being compatible for laser welding.
Dans l'exemple de mise en oeuvre de l'invention utilisant une entretoise, cette entretoise peut présenter une forme en coupelle.In the exemplary implementation of the invention using a spacer, this spacer may have a cup shape.
L'entretoise est par exemple posée sur l'une des bornes à relier. Si on le souhaite, l'entretoise s'étend sur une superficie sensiblement égale à celle de l'extrémité de la borne associée.The spacer is for example placed on one of the terminals to be connected. If desired, the spacer extends over an area substantially equal to that of the end of the associated terminal.
En variante, l'entretoise est agencée pour coiffer la borne associée, notamment en recouvrant cette borne sur son extrémité et sur une paroi latérale.In a variant, the spacer is designed to cap the associated terminal, in particular by covering this terminal on its end and on a side wall.
L'entretoise utilisée entre les bornes de raccordement électrique permet, le cas échéant, une soudure efficace lorsque les bornes respectives sont en matériaux qui ne sont pas compatibles pour une soudure efficace directement entre elles.The spacer used between the electrical connection terminals allows, if necessary, an effective weld when the respective terminals are of materials that are not compatible for effective welding directly between them.
Cette entretoise est alors réalisée en matériau compatible pour une soudure avec les deux bornes associées. Par exemple, le couvercle de la cellule de stockage d'énergie peut être réalisé en aluminium 6000, l'entretoise en aluminium 1000, et le corps de la cellule en aluminium 6000, ces aluminiums étant compatibles pour la soudure laser.This spacer is then made of compatible material for welding with the two associated terminals. For example, the cover of the energy storage cell can be made of aluminum 6000, the aluminum spacer 1000, and the body of the 6000 aluminum cell, these aluminum being compatible for laser welding.
Dans un exemple de mise en oeuvre de l'invention, chaque cellule de stockage d'énergie comporte deux bornes de raccordement électrique. Le cas échéant, le dispositif comporte au moins deux groupes chacun d'une pluralité de cellules de stockage d'énergie dont les bornes de raccordement sont soudées entre elles, et l'une des cellules d'un groupe est reliée électriquement à l'une des cellules de l'autre groupe par l'intermédiaire d'un connecteur tel qu'une barre conductrice ou busbar L'invention a encore pour objet un procédé pour fabriquer un dispositif de stockage d'énergie électrique, notamment pour équiper un véhicule automobile, comportant au moins deux cellules de stockage d'énergie, chaque cellule comportant au moins une borne de raccordement électrique, comportant l'étape suivante : - souder les bornes de raccordement électrique des deux cellules l'une à l'autre.In an exemplary implementation of the invention, each energy storage cell has two electrical connection terminals. Where appropriate, the device comprises at least two groups each of a plurality of energy storage cells whose connection terminals are welded together, and one of the cells of a group is electrically connected to one of cells of the other group via a connector such as a busbar or busbar The invention also relates to a method for manufacturing a device for storing electrical energy, in particular for equipping a motor vehicle, comprising at least two energy storage cells, each cell comprising at least one electrical connection terminal, comprising the following step: soldering the electrical connection terminals of the two cells to one another.
Si on le souhaite, préalablement à l'opération de soudage, les deux cellules sont disposées l'une par rapport à l'autre en maintenant les bornes en regard l'une de l'autre grâce à un élément de centrage coopérant avec ces bornes. Dans un exemple de mise en oeuvre de l'invention, lors de l'opération de soudage, les deux cellules sont entraînées en rotation.If desired, prior to the welding operation, the two cells are arranged relative to each other keeping the terminals facing each other by means of a centering element cooperating with these terminals . In an exemplary implementation of the invention, during the welding operation, the two cells are rotated.
En variante, c'est la source du laser de soudure qui est entraînée en rotation. La force pour mettre en rotation les cellules est exercée par exemple sur des corps cylindriques des cellules, notamment à l'aide de molettes en appui sur ces corps.Alternatively, it is the source of the welding laser that is rotated. The force for rotating the cells is exerted, for example, on cylindrical bodies of the cells, in particular by means of rollers resting on these bodies.
Dans un exemple de mise en oeuvre de l'invention, la puissance du laser servant à la soudure est modulée en fonction du temps.In an exemplary implementation of the invention, the power of the laser used for welding is modulated as a function of time.
Notamment la puissance décroît progressivement en fin de soudure, de manière à créer un évanouissement du laser. L'invention a encore pour objet un procédé pour fabriquer un dispositif de stockage d'énergie électrique, notamment pour équiper un véhicule automobile, comportant au moins deux cellules de stockage d'énergie, chaque cellule comportant au moins une borne de raccordement électrique, le procédé comportant l'étape suivante :In particular, the power decreases gradually at the end of the weld, so as to create a fading of the laser. The invention also relates to a method for manufacturing a device for storing electrical energy, in particular for equipping a motor vehicle, comprising at least two energy storage cells, each cell comprising at least one electrical connection terminal, the method comprising the following step:
- souder les bornes de raccordement électrique des deux cellules à une entretoise disposée entre ces bornes.- Solder the electrical connection terminals of the two cells to a spacer disposed between these terminals.
L'invention concerne également un outillage pour la mise en œuvre du procédé défini ci-dessus, comportant un élément de centrage pouvant coopérer avec les deux bornes de raccordement électrique à souder ensemble, pour centrer l'une des bornes par rapport à l'autre, cet élément de centrage comportant notamment une fente triangulaire pour recevoir les deux bornes.The invention also relates to a tool for implementing the method defined above, comprising a centering element that can cooperate with the two electrical connection terminals to be welded together, to center one of the terminals relative to the other. , this centering element comprising in particular a triangular slot for receiving the two terminals.
L'outillage peut comporter au moins une molette rotative pour s'appuyer sur un corps d'une cellule de stockage d'énergie pour la faire tourner.The tooling may include at least one rotating wheel for pressing on a body of an energy storage cell to rotate it.
L'invention pourra être mieux comprise à la lecture de la description détaillée qui va suivre, d'exemples de mise en œuvre non limitatifs de l'invention, et à l'examen du dessin annexé, sur lequel :The invention will be better understood on reading the following detailed description, non-limiting examples of implementation of the invention, and on examining the appended drawing, in which:
- la figure 1 illustre, schématiquement et partiellement, une étape de soudure de deux cellules de stockage d'énergie,FIG. 1 illustrates, schematically and partially, a step of welding two energy storage cells,
- la figure 2 représente, schématiquement et partiellement, suivant l'axe X, une cellule de la figure 1 , - la figure 3 illustre, schématiquement et partiellement, en coupe, la jonction entre deux bornes soudées par le procédé de la figure 1 ,FIG. 2 is a diagrammatic and partial representation along the X axis of a cell of FIG. 1; FIG. 3 is a diagrammatic and partial sectional view of the junction between two terminals soldered by the process of FIG. 1;
- la figure 4 représente, schématiquement et partiellement, de côté, la jonction entre deux bornes soudées par le procédé de la figure 1 ,FIG. 4 is a diagrammatic and partially side view of the junction between two terminals soldered by the process of FIG. 1,
- la figure 5 est une vue en coupe, schématique et partielle, d'une cellule de stockage d'énergie,FIG. 5 is a schematic and partial sectional view of an energy storage cell,
- la figure 6 est une courbe illustrant la variation, en fonction du temps, de la puissance d'un laser de soudure pour le procédé de la figure 1 , etFIG. 6 is a curve illustrating the variation, as a function of time, of the power of a welding laser for the process of FIG. 1, and
- les figures 7 à 9 représentent, schématiquement et partiellement, en coupe, deux autres exemples de mise en œuvre de l'invention. On a représenté sur la figure 1 deux cellules de stockage d'énergie 2 pour un dispositif de stockage d'énergie 1 d'un système micro-hybride à alterno- démarreur pour véhicule automobile.- Figures 7 to 9 show, schematically and partially in section, two other examples of implementation of the invention. FIG. 1 shows two energy storage cells 2 for an energy storage device 1 of a micro-hybrid motor starter-alternator system.
Le cas échéant, le système micro-hybride comprend un système de freinage récupératif.Where appropriate, the micro-hybrid system includes a regenerative braking system.
Le dispositif 1 peut par exemple comporter, en tout, six cellules de stockage d'énergie 2, dont deux seulement sont représentées sur la figure 1.The device 1 may for example comprise, in all, six energy storage cells 2, only two of which are shown in FIG.
Bien entendu, le dispositif 1 peut comporter un nombre de cellules différent de six, étant par exemple égal à deux ou dix. Chaque cellule 2 est formée par un super-condensateur ou EDLC en anglaisOf course, the device 1 may comprise a number of cells other than six, for example being equal to two or ten. Each cell 2 is formed by a supercapacitor or EDLC in English
(electrochemical double layer capacitator).(electrochemical double layer capacitator).
Comme illustré sur la figure 5, chaque cellule 2 comprend :As illustrated in FIG. 5, each cell 2 comprises:
- un corps 5 d'axe longitudinal X réalisé en aluminium de grade 1000 présentant une paroi latérale cylindrique 6 et un fond 7, une borne de raccordement 8 étant formée sur le fond 7,a body 5 of longitudinal axis X made of grade 1000 aluminum having a cylindrical side wall 6 and a bottom 7, a connection terminal 8 being formed on the bottom 7,
- un couvercle 9, réalisé en aluminium de grade 6000, serti sur le corps 5 et délimitant avec celui-ci un espace intérieur 10, une borne de raccordement 11 étant formée sur ce couvercle 9,a cover 9, made of grade 6000 aluminum, crimped on the body 5 and delimiting therewith an interior space 10, a connection terminal 11 being formed on this cover 9,
- une structure électrochimique 12 disposée dans l'espace intérieur 10,an electrochemical structure 12 disposed in the interior space 10,
- des platines 13 et 14, ou collecteurs, faisant interface entre la structure électrochimique 12 et respectivement le couvercle 9 et le fond 7. Ces platines 13 et 14 sont soudées sur la structure électrochimique 12. La platine 13, respectivement 14, est emmanchée sur le couvercle 9, respectivement le fond 7.- Plates 13 and 14, or collectors, interfacing between the electrochemical structure 12 and the lid 9 and the bottom 7. These plates 13 and 14 are welded to the electrochemical structure 12. The plate 13, respectively 14, is fitted on the cover 9, respectively the bottom 7.
Si on le souhaite, les platines 13 et 14 peuvent être omises et la structure 12 est soudée directement sur le couvercle 9 et le fond 7.If desired, the plates 13 and 14 can be omitted and the structure 12 is welded directly to the cover 9 and the bottom 7.
Le couvercle 9 fait partie intégrante de la cellule 2, à savoir ce couvercle ne peut pas être retiré sous peine de détruire la cellule 2. Dans l'exemple décrit, les deux bornes de raccordement électrique 8 et 11 des deux cellules 2 voisines sont soudées par soudure laser à l'aide d'une source laser 20.The cover 9 is an integral part of the cell 2, ie this cover can not be removed under penalty of destroying the cell 2. In the example described, the two electrical connection terminals 8 and 11 of the two neighboring cells 2 are soldered by laser welding using a laser source 20.
La trace 21 de soudure, ou cordon de soudure, sur la jonction 22 des deux bornes 8 et 11 s'étend sur tout le pourtour de ces bornes (voir figure 4).The weld trace 21, or weld bead, on the junction 22 of the two terminals 8 and 11 extends around the entire periphery of these terminals (see Figure 4).
La soudure est réalisée radialement sur une paroi cylindrique 25 des bornes 8 et 11 de raccordement électrique, et la trace 21 de soudure pénètre, sans risque de dommage de la cellule, davantage dans l'épaisseur de ces bornes.The weld is made radially on a cylindrical wall 25 of the terminals 8 and 11 of electrical connection, and the weld trace 21 penetrates, without risk of damage to the cell, more in the thickness of these terminals.
La trace 21 de soudure sur la jonction 22 des deux bornes se termine à une extrémité circonférentielle par une portion 26 en forme généralement triangulaire, ou en forme de pointe (voir figure 4).The solder trace 21 on the junction 22 of the two terminals terminates at a circumferential end by a portion 26 in generally triangular shape, or in the shape of a point (see FIG. 4).
La portion 26 peut présenter un état de surface brillant.The portion 26 may have a glossy surface condition.
Cette forme caractéristique de la portion 26 est la conséquence de l'évanouissement du laser en fin de cycle de soudure. Cet évanouissement correspond à la réduction progressive de la puissance de la source laser utilisée pour la soudure.This characteristic shape of the portion 26 is the consequence of the fading of the laser at the end of the welding cycle. This fading corresponds to the gradual reduction of the power of the laser source used for welding.
La courbe de la figure 6 montre l'évolution de la puissance du laser en fonction du temps lors d'une opération de soudure.The curve of FIG. 6 shows the evolution of the power of the laser as a function of time during a welding operation.
L'évanouissement du laser permet de terminer la soudure progressivement, évitant ainsi tout risque de création de trou ou cratère dans la soudure pouvant apparaître lors d'une extinction brutale et instantanée du laser et en conséquence générer une faiblesse mécanique.The fading of the laser makes it possible to finish the welding progressively, thus avoiding any risk of creating a hole or crater in the weld that may appear during a sudden and instantaneous extinction of the laser and consequently generate mechanical weakness.
L'évanouissement du laser correspond à la phase E, entre les instants t2 et t3, de la courbe de la figure 6. Comme visible sur la figure 3, la trace de soudure 21 sur la jonction 22 des deux bornes 8 et 11 s'étend sur une profondeur e d'au moins 1 mm, notamment d'environ 2.5 mm, pour un diamètre d des bornes compris environ entre 14 mm et 16 mm.The fading of the laser corresponds to the phase E, between the instants t2 and t3, of the curve of FIG. 6. As can be seen in FIG. 3, the solder trace 21 on the junction 22 of the two terminals 8 and 11 is extends over a depth e of at least 1 mm, in particular about 2.5 mm, for a terminal diameter of about 14 mm to 16 mm.
Les bornes soudées sont réalisées dans des matériaux compatibles pour une soudure laser, notamment les bornes étant réalisées en aluminium de grades différents. Préalablement à l'opération de soudage, les deux cellules 2 sont disposées l'une par rapport à l'autre en maintenant les bornes 8 et 11 en regard l'une de l'autre grâce à un élément de centrage 30 coopérant avec ces bornes (voir figureThe welded terminals are made of compatible materials for laser welding, in particular the terminals being made of aluminum of different grades. Prior to the welding operation, the two cells 2 are arranged relative to one another by keeping the terminals 8 and 11 facing one another by means of a centering element 30 cooperating with these terminals. (see figure
2). Cet élément de centrage 30, appartenant à un outillage 33, comporte une fente triangulaire 31 pour recevoir les deux bornes 8 et 11.2). This centering element 30 belonging to a tool 33 has a triangular slot 31 for receiving the two terminals 8 and 11.
Cette forme triangulaire permet de limiter les frottements lors de la rotation. En variante, la fente peut présenter un pourtour en arc de cercle. L'outillage 33 peut en outre comporter une pluralité de molettes motrices rotatives 34 pour s'appuyer sur les corps cylindriques 6 des cellules de stockage d'énergie 2 pour les faire tourner (voir figure 2).This triangular shape makes it possible to limit friction during rotation. In a variant, the slot may have a periphery in an arc of a circle. Tooling 33 may further include a plurality of rotary drive wheels 34 for pressing on cylindrical bodies 6 of energy storage cells 2 to rotate them (see Figure 2).
D'autres molettes 35 sont prévues pour empêcher la cellule 2 de sortir de la fente 31.Other wheels 35 are provided to prevent the cell 2 from coming out of the slot 31.
Ainsi, lors de l'opération de soudure, la source laser 20 peut être immobile, et la rotation des cellules 2 permet d'obtenir la soudure souhaitée.Thus, during the welding operation, the laser source 20 can be stationary, and the rotation of the cells 2 makes it possible to obtain the desired weld.
Dans un autre exemple de mise en oeuvre de l'invention illustré sur les figures 7 et 8, les bornes de raccordement électrique 8 et 11 des deux cellules 2 sont reliées électriquement l'une à l'autre par l'intermédiaire d'une entretoise 40 interposée entre les deux bornes et soudée à ces deux bornes. L'entretoise 40 présente une forme en coupelle.In another exemplary embodiment of the invention illustrated in FIGS. 7 and 8, the electrical connection terminals 8 and 11 of the two cells 2 are electrically connected to one another via a spacer. 40 interposed between the two terminals and soldered to these two terminals. The spacer 40 has a cup shape.
Cette entretoise 40 est soudée 'par transparence' sur la borne 8 ou 11 (voir figure 7).This spacer 40 is 'transparent' welded to terminal 8 or 11 (see FIG. 7).
Puis cette entretoise 40 est soudée 'bord à bord' sur l'autre borne 8 ou 11 (voir figure 8). Dans l'exemple des figures 7 et 8, les bornes 8 et 11 présentent le même diamètre.Then this spacer 40 is welded 'edge to edge' on the other terminal 8 or 11 (see Figure 8). In the example of Figures 7 and 8, the terminals 8 and 11 have the same diameter.
L'entretoise 40 s'étend sur une superficie sensiblement égale à celle de l'extrémité de la borne associée 11The spacer 40 extends over an area substantially equal to that of the end of the associated terminal 11
L'entretoise 40 permet, le cas échéant, une soudure efficace lorsque les bornes respectives sont en matériaux qui ne sont pas compatibles pour une soudure efficace directement entre elles. Cette entretoise 40 est alors réalisée en un matériau compatible pour une soudure avec les deux bornes associées 8 et 11.The spacer 40 allows, where appropriate, an effective weld when the respective terminals are of materials that are not compatible for effective welding directly between them. This spacer 40 is then made of a material compatible for welding with the two associated terminals 8 and 11.
Comme illustré sur la figure 8, l'entretoise 40 comprend un fond 41 soudé sur la borne 11 par une soudure axiale par un faisceau laser parallèle à l'axe X. L'entretoise 40 est soudée sur l'autre borne 8 par une soudure radiale par un faisceau perpendiculaire à l'axe X.As illustrated in FIG. 8, the spacer 40 comprises a bottom 41 welded to the terminal 11 by an axial weld by a laser beam parallel to the axis X. The spacer 40 is welded to the other terminal 8 by a weld radial by a beam perpendicular to the X axis.
En variante, comme illustré sur la figure 9, l'entretoise 40 est agencée pour coiffer la borne 11 associée, recouvrant cette borne sur son extrémité et sur une paroi latérale 25. Dans cet exemple, la borne 8 présente un diamètre supérieur à celui de la borne 11 (par exemple 16 mm et 14 mm respectivement), alors que dans l'exemple des figures 7 et 8, les bornes 8 et 11 présentent des diamètres identiques, par exemple de 14 mm.In a variant, as illustrated in FIG. 9, the spacer 40 is arranged to cover the associated terminal 11, covering this terminal on its end and on a side wall 25. In this example, the terminal 8 has a diameter greater than that of terminal 11 (for example 16 mm and 14 mm respectively), while in the example of Figures 7 and 8, the terminals 8 and 11 have identical diameters, for example 14 mm.
Bien entendu, l'invention n'est pas limitée aux exemples de mise en œuvre qui viennent d'être décrits.Of course, the invention is not limited to the implementation examples which have just been described.
Par exemple, les cellules 2 peuvent comporter une batterie Li-On (Lithium- Ion), Ni-Mh (Nickel- Métal hydrure) ou au Plomb. For example, cells 2 may comprise a Li-On (Lithium-Ion), Ni-Mh (Nickel-Metal Hydride) or Lead battery.

Claims

Revendications claims
1. Dispositif de stockage d'énergie (1 ), notamment pour équiper un véhicule automobile, comportant au moins deux cellules de stockage d'énergie (2), chaque cellule comportant au moins une borne de raccordement électrique (8 ; 11 ), caractérisé par le fait que - soit les bornes de raccordement électrique des deux cellules sont soudées l'une à l'autre,1. Energy storage device (1), in particular for equipping a motor vehicle, comprising at least two energy storage cells (2), each cell comprising at least one electrical connection terminal (8; 11), characterized in that - either the electrical connection terminals of the two cells are soldered to one another,
- soit les bornes de raccordement électrique des deux cellules sont reliées électriquement l'une à l'autre par l'intermédiaire d'une entretoise (40) interposée entre les deux bornes et soudée à ces deux bornes,either the electrical connection terminals of the two cells are electrically connected to one another via a spacer (40) interposed between the two terminals and soldered to these two terminals,
- et que la cellule de stockage d'énergie (2) comporte un supercondensateur comprenant dans un espace intérieur (10) une structure électrochimique (12), et la borne de raccordement électrique (8 ; 11 ) fait partie d'une paroi délimitant l'espace intérieur de la cellule.and that the energy storage cell (2) comprises a supercapacitor comprising in an interior space (10) an electrochemical structure (12), and the electrical connection terminal (8; 11) is part of a wall delimiting the interior space of the cell.
2. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que les deux bornes de raccordement électrique (8 ; 11 ) sont soudées par soudure laser.2. Device according to one of the preceding claims, characterized in that the two electrical connection terminals (8; 11) are welded by laser welding.
3. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait que la trace de soudure (21 ) sur la jonction (22) des deux bornes (8 ; 11 ) se termine à une extrémité circonférentielle par une portion (26) en forme généralement triangulaire. 3. Device according to any one of the preceding claims, characterized in that the solder trace (21) on the junction (22) of the two terminals (8; 11) terminates at a circumferential end by a portion (26). in generally triangular form.
4. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait que les bornes (8 ; 11 ) soudées sont réalisées dans des matériaux compatibles pour une soudure laser, notamment les bornes étant réalisées en aluminium de grades différents.4. Device according to any one of the preceding claims, characterized in that the terminals (8; 11) welded are made of compatible materials for laser welding, in particular the terminals being made of aluminum of different grades.
5. Dispositif selon la revendication 1 , caractérisé par le fait que l'entretoise (40) présente une forme en coupelle.5. Device according to claim 1, characterized in that the spacer (40) has a cup-shaped.
6. Procédé pour fabriquer un dispositif de stockage d'énergie électrique (1 ), notamment pour équiper un véhicule automobile, comportant au moins deux cellules de stockage d'énergie (2), chaque cellule comportant au moins une borne de raccordement électrique, le procédé comportant l'étape suivante :6. A method for manufacturing an electrical energy storage device (1), in particular for equipping a motor vehicle, comprising at least two energy storage cells (2), each cell comprising at least one electrical connection terminal, the process comprising the following step:
- souder les bornes de raccordement électrique (8 ; 11 ) des deux cellules l'une à l'autre.- solder the electrical connection terminals (8; 11) of the two cells to one another.
7. Procédé selon la revendication précédente, caractérisé par le fait que, préalablement à l'opération de soudage, les deux cellules sont disposées l'une par rapport à l'autre en maintenant les bornes en regard l'une de l'autre grâce à un élément de centrage (30) coopérant avec ces bornes.7. Method according to the preceding claim, characterized in that, prior to the welding operation, the two cells are arranged relative to each other keeping the terminals facing each other by a centering element (30) cooperating with these terminals.
8. Procédé selon l'une des deux revendications précédentes, caractérisé par le fait que, lors de l'opération de soudage, les deux cellules sont entraînées en rotation.8. Method according to one of the two preceding claims, characterized in that, during the welding operation, the two cells are rotated.
9. Procédé selon l'une quelconque des revendications 7 à 9, caractérisé par le fait que la puissance du laser servant à la soudure est modulée en fonction du temps, notamment la puissance décroissant progressivement en fin de soudure.9. A method according to any one of claims 7 to 9, characterized in that the power of the laser for welding is modulated as a function of time, in particular the power decreasing gradually at the end of welding.
10. Procédé pour fabriquer un dispositif de stockage d'énergie électrique (1 ), notamment pour équiper un véhicule automobile, comportant au moins deux cellules de stockage d'énergie (2), chaque cellule comportant au moins une borne de raccordement électrique, le procédé comportant l'étape suivante :10. A method for manufacturing an electrical energy storage device (1), in particular for equipping a motor vehicle, comprising at least two energy storage cells (2), each cell comprising at least one electrical connection terminal, the method comprising the following step:
- souder les bornes de raccordement électrique des deux cellules à une entretoise (40) disposée entre ces bornes.- Solder the electrical connection terminals of the two cells to a spacer (40) disposed between these terminals.
11. Outillage pour la mise en œuvre du procédé selon l'une quelconque des revendications 7 à 11 , comportant un élément de centrage pouvant coopérer avec les deux bornes de raccordement électrique à souder ensemble, pour centrer l'une des bornes par rapport à l'autre, cet élément de centrage comportant notamment une fente triangulaire (31 ) pour recevoir les deux bornes. 11. Tooling for implementing the method according to any one of claims 7 to 11, comprising a centering element that can cooperate with the two electrical connection terminals to be welded together, to center one of the terminals relative to the other, this centering element comprising in particular a triangular slot (31) for receiving the two terminals.
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FR2940858B1 (en) 2011-04-01
FR2940858A1 (en) 2010-07-09

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