WO2021151702A1 - Élément de connexion, dispositif et procédé de production de connexion liée - Google Patents

Élément de connexion, dispositif et procédé de production de connexion liée Download PDF

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Publication number
WO2021151702A1
WO2021151702A1 PCT/EP2021/050915 EP2021050915W WO2021151702A1 WO 2021151702 A1 WO2021151702 A1 WO 2021151702A1 EP 2021050915 W EP2021050915 W EP 2021050915W WO 2021151702 A1 WO2021151702 A1 WO 2021151702A1
Authority
WO
WIPO (PCT)
Prior art keywords
connecting element
contact
joining partner
curvature
bearing surface
Prior art date
Application number
PCT/EP2021/050915
Other languages
German (de)
English (en)
Inventor
Markus Leimser
Tobias GERHARDT
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2021151702A1 publication Critical patent/WO2021151702A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/02—Soldered or welded connections
    • H01R4/027—Soldered or welded connections comprising means for positioning or holding the parts to be soldered or welded
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
    • H01R43/0263—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections for positioning or holding parts during soldering or welding process
    • 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
    • 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
    • H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
    • H01R43/0221—Laser welding
    • 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

Definitions

  • Connection element device and method for producing an integral connection
  • the invention relates to a connecting element comprising a contact element with a curved support surface.
  • the invention also relates to a device having the connecting element which is materially connected to a joining partner.
  • the invention also relates to the method for producing an integral connection with the provision of the connecting element with the curved bearing surface of the contact element.
  • the document DE 102011 085 467 A1 discloses an electrochemical device comprising at least one electrochemical cell with a first cell terminal, a second electrochemical cell with a second cell terminal and at least one cell connector for electrically conductive connection of the first cell terminal and the second cell terminal.
  • the as yet unpublished document with the file number DE 102018212 335.7 relates to an electrical connecting element, in particular for power electronics and / or a battery module.
  • the object of the present invention is to improve material connections or connection elements, in particular in the field of power electronics and / or battery technology.
  • the present invention relates to a connector.
  • the connecting element has at least one metallic material, in particular a copper alloy and / or an aluminum alloy.
  • the connecting element also preferably has a sheet-metal or plate-shaped extension and it comprises at least one contact element or one contact area.
  • a sheet-like or plate-shaped extension in the sense of this application is understood to mean a height or thickness of the connecting element that is relatively small compared to the longitudinal and vertical direction or the length and width of the connecting element, the length and width of the connecting element in particular preferably each by a factor of five to ten greater than the height or thickness of the connecting element.
  • the thickness is in particular an average thickness or an average height of the cross section in the contact area.
  • the thickness of the connecting element is preferably 0.1 to 5 millimeters.
  • the width of the connecting element and the length of the connecting element are each preferably 5 to 500 millimeters.
  • the thickness is 0.5 millimeters, the width 10 millimeters and the length 50 millimeters.
  • the contact element is set up by means of a curved contact surface to contact a joint partner, resulting in an electrically or thermally conductive contact in particular, with a tangential surface of the curvature of the contact surface on the side of the contact surface or the connecting element facing the joint partner at each point of the contact surface .
  • the curved support surface is advantageously set up to compensate for at least one height and / or angular offset between the contact element and a joining partner.
  • the contact element is set up by means of the curved support surface to be in a distance with an amount less than or equal to the thickness of the connecting element from the contact between the contact element and the joining partner to generate a joint gap with a joint gap height of at most one fifth of the thickness of the connecting element.
  • This configuration of the connecting element results in the advantage that the connecting element can be reliably contacted and welded to a joining partner, since on the one hand a height or position offset and / or a rotation can be compensated by means of the curvature of the support surface and on the other hand a small joint gap height or a thin joint gap results in a relatively large area of point or line contact between the connecting element and the joint partner.
  • the resulting thin joint gap can advantageously produce a reliable material connection or weld seam between the connecting element and the joint partner, for example by means of laser beam welding or ultrasonic welding, in the contacting area.
  • the curved contact surface of the contact element advantageously has, at least in part, a cylindrical, ellipsoidal, paraboloidal or spherical shape.
  • At least one of the main curvatures of the curvature of the support surface has a radius with an amount of at least the thickness of the connecting element in the area of the contact element.
  • at least one of the main curvatures of the curvature of the support surface has a radius with an amount at least five times greater than and particularly preferably at least one hundred times greater than the thickness of the connecting element in the area of the contact element.
  • one of the main curvatures has the value zero at each point on the bearing surface, so that the curvature of the bearing surface is straight in at least one direction of extension.
  • the curvature of the support surface has the shape or contour of a straight circular cylinder, at least in a partial area.
  • the two main curvatures coincide at each point at least for a sub-area of the bearing surface, so that for this sub-area the curvature of the bearing surface corresponds in particular to an area of a spherical surface.
  • the curvature of the support surface has, at least in a partial area, the shape or contour of a spherical surface, in particular a spherical half-shell.
  • the connecting element has a marking on the side of the contact element lying opposite the support surface.
  • the marking is set up to identify a positioning and / or a positioning area of a laser beam for reliable laser welding of the connecting element with a joining partner.
  • the contact element of the connecting element can have a plurality of curved bearing surfaces.
  • the support surfaces are in particular spatially separated or spaced from one another. This is particularly advantageous if no main curvature is zero, i.e. in the case of point-like contact between a connecting element and the joining partner, since several welds per contact element can thus be present or created, whereby a cross-section of a material connection between the connecting element and the joining partner is increased.
  • the connecting element comprises at least one further contact element, wherein the further contact element can have a flat or curved support surface and an intermediate element is arranged between the contact elements.
  • the contact element with the curved support surface also compensates for a height offset and / or a lateral offset and / or an angular offset and / or a rotation between the connecting element and the joining partner or the joining partner and the other joining partner, whereby both the contact element with the curved Support surface as well as on the flat contact element, a material connection or a weld seam can be reliably produced in the lap joint.
  • the intermediate element has in particular at least one spring area. Any mechanical stresses that may arise, for example due to bending, are advantageously absorbed by the optional spring area, so that mechanical stresses on the material connection or the weld seam are at least reduced.
  • the invention also relates to a device, for example a battery module, an inverter or a control device or a computing unit, in particular power electronics.
  • the device has, in particular, a high flow of current in the electrical connections.
  • the device comprises a joining partner, for example a battery cell.
  • the device further comprises the connecting element according to the invention, the joining partner and the connecting element being materially connected to one another on at least one curved bearing surface of a contact element of the connecting element.
  • a component for example a battery cell or a capacitor or a control device, advantageously has the connecting element according to the invention.
  • the joining partner comprises, for example, an electrically conductive aluminum or copper alloy, for example the joining partner is a connection element with planar electrical connection contacts, which are materially connected to one another with the curved contact surface of the contact element of the connection element.
  • the invention also relates to a method for producing a material compound.
  • the joining partner for example a battery cell
  • At least two joining partners are preferably provided, for example two battery cells, which in particular are electrically connected to one another in series in a battery module by means of the connecting element or should be connected in parallel.
  • the connecting element according to the invention is provided. Then, in a step of the method, the joining partner and the connecting element are contacted on the contact element by means of the at least one curved support surface, in particular directly and / or by means of an overlap joint.
  • the tangential surface of the curvature of the bearing surface lies on the side of the bearing surface directed towards the joining partner, so that at least one point-like and / or linear contacting between the joining partner and the connecting element results.
  • a material connection between the connecting element and the joining partner is then produced in the region of the at least one point and / or line contact, in particular by means of laser beam welding and / or ultrasonic welding.
  • the material connection between the connecting element and the joining partner is advantageously produced by means of a laser beam with a wavelength in the green spectral range or with a wavelength between approx. 500 nanometers to approx. 550 nanometers.
  • the method results in the advantage that reliable contacting also takes place in the event of a height offset and / or a lateral offset of the at least one joining partner, the resulting joining gap in the area of the point-like and / or linear contacting being sufficiently small to reliably generate a mechanically and thermally stable one integral connection to form a durable and vibration-stable electrical connection.
  • a laser beam for laser beam welding is positioned as a function of a marking on the side of the contact element opposite the contact surface; in particular, the marking is recognized in a camera image captured by a camera, the The camera image advantageously depicts the side of the connecting element with the marking that is opposite the support surface.
  • Figure 1 Representation of a joint gap with a straight connecting element and height offset between two joint partners.
  • Figure 2a joint gap with a straight connecting element
  • FIG. 2b Joint gap in the case of a connecting element with a curved support surface
  • FIG. 4 Flow diagram of the method as a block diagram
  • a straight connecting element 10 according to the prior art is shown without a curved support surface, the connecting element 10 contacting a first joining partner 20 in the first contact area 40 and a second joining partner 30 offset in height from the first joining partner in the second contact area 60. Due to the height offset 90 between the first joining partner 20 and the second joining partner 30, a first joining gap 50 results between the first joining partner 20 and the connecting element 10 with an increasing joining gap height 51 and 52 directed away from the contact 40 and a second joining gap 70 between the second joining partner 30 and the connecting element 10 with an increasing joint gap height 71 and 72 directed away from the contacting 60.
  • the joint gap heights 51, 52, 71 and 72 which are relatively large for creating a material connection, result even at a short distance from the respective contacting 40 and 60, since the connecting element 10 is only slightly or hardly bent due to its thickness 80 even when a contact force F is applied.
  • These relatively large joint gap heights 51, 52, 71 and 72 at a short distance from the respective contact 40 or 60 respectively make it more difficult to produce a material connection or a weld seam between the connecting element and the respective joint partner.
  • Due to the required conductor cross-section the thickness 80 cannot be sufficiently reduced in high-current applications in order to solve the described technical problem of a joint gap that is too small for welding. In the prior art, this results in the pure height offset 90 shown in FIG.
  • FIG 2a compared to Figure 1, the joint gap 50 of the prior art is shown enlarged.
  • a joint gap 50 results with a joint gap height 51 of 0.352 millimeters, for example, this joint gap height 51 at this distance 55 being not sufficiently small or the ratio of the distance to the joint gap height being too high for reliable generation a thermally and / or mechanically stable material connection is evaluated and / or whereby a resulting weld seam cross-section of a resulting material connection or a weld seam between the connecting element 10 and the joining partner 20 is not sufficiently large to conduct a high current with a sufficiently low ohmic resistance electrically .
  • FIG. 2b shows a connecting element 100 in contact with a joining partner 190, the connecting element 100 making mechanical contact with the joining partner 190 in the contact area 140 by means of a curved support surface 120 of a contact element 110.
  • the curvature is shaped or directed towards contacting 140.
  • the curvature of the bearing surface 120 of the connecting element 100 at each point of the bearing surface 120 of the contact element 110 has a tangential plane 130 on the side 101 of the connecting element 100 directed towards the joining partner 190.
  • At least one main curvature of the curvature of the support surface 120 has a first radius 121.
  • the connecting element is set up to provide at least one height and / or angular offset between the contact element 110 and the joining partner when making contact 140 190 balance.
  • the contact 140 between the contact element 110 and the joining partner 190 also results in a gap 155 with an amount less than or equal to the thickness 103 of the connecting element 100, a joint gap 170 with a joint gap height 171 of at most one fifth of the thickness 103 of the connecting element.
  • the connecting element 100 is set up by means of the contact element 110 with the curved support surface 120 to be welded to the joining partner 190.
  • An amount of the first radius 121 is preferably at least five times greater than the thickness 103 of the connecting element 100 in the area of the contact element 110; the first radius 121 is preferably essentially a hundred times greater than the thickness 103 of the connecting element 100 in the area of the contact element 110 a sheet-metal or plate-shaped cross section with a main direction of extent in the longitudinal direction 199.
  • the connecting element 100 has a width and a length which in each case exceed the amount of the thickness 103 of the connecting element 100 by a factor of five.
  • the contact element 110 is set up by means of the curved support surface 120 to compensate for a positioning offset or an angular offset, in particular in height, and / or a rotation between the contact element 110 and the joining partner 190, whereby in the area of the contact 140 through the curved support surface 120 des Contact element 110 results in a small joint gap height 171 of the joint gap 170.
  • an optional marking can be arranged which, for example, identifies a positioning or a positioning area for a laser beam for laser beam welding.
  • FIG. 3 shows a cross section of the connecting element 300 in contact with a first joining partner 390, the contacting 340 of the joining partner 390 taking place by means of a contact element 310 of the connecting element 300.
  • the contact element 310 has a curved bearing surface 320 and the contacting 340 takes place on or by means of this curved bearing surface 320.
  • the connecting element 300 also has contact with a second joining partner 391.
  • the contacting 341 of the second joining partner 391 takes place by means of a further contact element 311 of the connecting element 300, the contact element 311 having a curved bearing surface 321 and the contacting 341 taking place on this curved bearing surface 321.
  • Each curvature of the respective support surface 320, 321 can in principle have two main curvatures.
  • the cross section from FIG. 3 corresponds to an x-y plane.
  • the tangential plane of the curvature of the bearing surface 320 of the contact element 310 lies, for example, at a point of the curvature in the zx plane, see FIG
  • the normal vector of the tangential plane 330 now runs in the y direction and spans a cutting plane with each direction present in the tangential direction.
  • the main directions of curvature ie a minimum or maximum amount of a flat curvature in the respective cutting plane at the point of intersection, can preferably lie in the x-direction as well as in the z-direction, with a respective radius for the respective main curvature preferably at least five times greater than the thickness 303 of the connecting element 300 is in the area of the contact element 310, 311.
  • a respective radius for the respective main curvature preferably at least five times greater than the thickness 303 of the connecting element 300 is in the area of the contact element 310, 311.
  • the two main curvatures can coincide at each point, so that for this partial area the curvature of the support surface corresponds in particular to an area of a spherical surface.
  • the curvature can also have the amount zero at any point of the support surface 120, 320, 321 in the main direction of curvature, for example in the x direction or in the z direction, see FIG. 3, so that for example in the x direction or in the z direction there is no curvature or the curvature of the support surface is straight in the x direction or in the z extension direction. If there is a curvature with an amount equal to zero in one direction, contact is made linearly between the connecting element and the respective joining partner.
  • the contact between the connecting element and the respective joining partner is point-like.
  • the curved contact surface 320 or 321 of the contact element 310 or 311 of the connecting element 300 results in a joint gap 370 or 375 in the area of the contact 340 or 341 with a small joint gap height 371 or 376.
  • the contacts 340 and 341 on or by means of the curved contact surfaces 320 and 321 result in small joint gap heights 371 or 376, so that the connecting element 300 is set up to be reliably connected or welded to the first joint partner 390 and the second joint partner 391 despite a height offset 399 between a surface of the first and second joint partner 390, 391 .
  • the connecting element has a contact element with a plurality of curved contact surfaces, which are each set up to contact the same joining partner.
  • the connecting element has a plurality of contact elements each with at least one curved contact surface, at least two contact elements each being set up to contact the same joining partner.
  • the connecting element comprises at least one further planar contact element.
  • An intermediate element can be arranged between the contact element with the curved support surface and the planar contact element, the intermediate element comprising at least one spring area.
  • a sequence of the method for producing a material connection is shown schematically as a block diagram.
  • a joining partner 190, 390, 391 is provided in a step 410.
  • the connection element 100, 300 according to the invention is provided 420.
  • contacting 430 of the joining partner 190, 390, 391 and the connection element 100, 300 on the contact element 110, 310, 311 takes place by means of the at least one curved support surface 120, 320 , 321.
  • a laser beam for laser beam welding is positioned as a function of a marking arranged on the side of the contact element 110, 310, 311 lying opposite the support surface 120, 320, 321.
  • an integral connection between the connection element 100, 300 and the joining partner 190, 390, 391 is produced in the area of the at least one point and / or line contact 140, 340, 341.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention concerne un élément de connexion (100, 300) comprenant au moins un matériau électriquement conducteur, en particulier un alliage de cuivre et/ou un alliage d'aluminium. L'élément de connexion (100, 300) comprend au moins un élément de contact (110, 310, 311), et l'élément de contact (110, 310, 311), grâce à une surface de contact incurvée (120, 320, 321), est conçu pour entrer en contact avec un partenaire d'assemblage (190, 390, 391) de manière électriquement conductrice, une surface tangentielle (130, 330) de la courbure sur l'élément de connexion (100, 300) faisant face au partenaire d'assemblage (190, 390, 391) se trouve sur chaque point de la surface de contact (120, 320, 321), et l'élément de contact est également conçu pour former un interstice de jonction (170, 370, 375) avec une hauteur d'interstice de jonction (171, 371, 376) d'au maximum un cinquième de l'épaisseur (103, 303) de l'élément de connexion (100, 300) à une distance (155) du point de contact (140, 340, 341), ladite distance étant inférieure ou égale à l'épaisseur (103, 303) de l'élément de connexion (100, 300).
PCT/EP2021/050915 2020-01-30 2021-01-18 Élément de connexion, dispositif et procédé de production de connexion liée WO2021151702A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020201094.3 2020-01-30
DE102020201094.3A DE102020201094B3 (de) 2020-01-30 2020-01-30 Verbindungselement, Vorrichtung und Verfahren zur Herstellung einer stoffschlüssigen Verbindung

Publications (1)

Publication Number Publication Date
WO2021151702A1 true WO2021151702A1 (fr) 2021-08-05

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Application Number Title Priority Date Filing Date
PCT/EP2021/050915 WO2021151702A1 (fr) 2020-01-30 2021-01-18 Élément de connexion, dispositif et procédé de production de connexion liée

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DE (1) DE102020201094B3 (fr)
WO (1) WO2021151702A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011085467A1 (de) 2011-10-28 2013-05-02 Elringklinger Ag Elektrochemische Vorrichtung
EP2843731A2 (fr) * 2013-08-27 2015-03-04 Samsung SDI Co., Ltd. Module de batterie
DE102018212335A1 (de) 2018-07-24 2020-01-30 Robert Bosch Gmbh Elektrisches Verbindungselement, Leistungselektronik, Batteriemodul und Verfahren zur elektrischen Verbindung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011085467A1 (de) 2011-10-28 2013-05-02 Elringklinger Ag Elektrochemische Vorrichtung
EP2843731A2 (fr) * 2013-08-27 2015-03-04 Samsung SDI Co., Ltd. Module de batterie
DE102018212335A1 (de) 2018-07-24 2020-01-30 Robert Bosch Gmbh Elektrisches Verbindungselement, Leistungselektronik, Batteriemodul und Verfahren zur elektrischen Verbindung

Also Published As

Publication number Publication date
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