DE102013200282A1 - Fixing device e.g. cell connector, for fixing planar electric conductor at electrode connection of rechargeable lithium-ion cell of high power-vehicle-battery, has compensating element arranged below another compensating element at boundary - Google Patents

Fixing device e.g. cell connector, for fixing planar electric conductor at electrode connection of rechargeable lithium-ion cell of high power-vehicle-battery, has compensating element arranged below another compensating element at boundary

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Publication number
DE102013200282A1
DE102013200282A1 DE201310200282 DE102013200282A DE102013200282A1 DE 102013200282 A1 DE102013200282 A1 DE 102013200282A1 DE 201310200282 DE201310200282 DE 201310200282 DE 102013200282 A DE102013200282 A DE 102013200282A DE 102013200282 A1 DE102013200282 A1 DE 102013200282A1
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DE
Germany
Prior art keywords
element
compensating element
screw
characterized
battery
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.)
Pending
Application number
DE201310200282
Other languages
German (de)
Inventor
Michael Gless
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.)
Robert Bosch GmbH
Samsung SDI Co Ltd
Original Assignee
Robert Bosch GmbH
Samsung SDI Co Ltd
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, Samsung SDI Co Ltd filed Critical Robert Bosch GmbH
Priority to DE201310200282 priority Critical patent/DE102013200282A1/en
Publication of DE102013200282A1 publication Critical patent/DE102013200282A1/en
Application status is Pending legal-status Critical

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/20Current conducting connections for cells
    • H01M2/30Terminals
    • H01M2/305Poles or terminals for starting, lighting or ignition [SLI] batteries, traction or motive power type or standby power batteries
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00Batteries for particular applications

Abstract

The device (1) has a screw element (4) with a screw thread for arrangement at an electrode terminal (3). A planar designed compensating element (6) e.g. clamping disk, is mechanically pre-tensioned, and arranged centered at the screw element relative to the screw thread of the screw element. Another planar designed compensating element (7) e.g. washer, is arranged below the former compensating element at an outer boundary (8) of the former compensating element. A fastening element (10) is made of dimensionally stable, resilient deformable plastic. An independent claim is also included for a battery module.

Description

  • The invention relates to a device for fixing a planar electrical conductor, in particular a cell or module connector, to an electrode terminal of a battery cell, wherein the device comprises a screw with a screw thread for placement on an electrode terminal and a first planarized compensation element, wherein the first Compensation element is mechanically biased and centered with respect to the screw thread of the screw is arranged on the screw.
  • Furthermore, the invention relates to a battery module having a plurality of battery cells, wherein the battery cells each have at least one electrode terminal with a screw thread and wherein at least one electrode terminal of a battery cell is electrically conductively contacted by means of a flat electrical conductor.
  • State of the art
  • Battery modules, such as in particular high-performance vehicle batteries usually have a plurality of electrically interconnected battery cells. In addition, high-performance vehicle batteries, in particular, include a large number of electrical components, such as contactors, resistors, voltmeters and / or high-voltage connectors. These electrical components and in particular the electrode terminals of battery cells are electrically conductively connected to each other by means of flat trained electrical conductors, in particular by means of so-called cell connectors or module connectors with the electrode terminals of battery cells, wherein an arrangement of the electrical conductors at the electrode terminals in particular by screw. In particular so that the Joule heat is kept low by ohmic losses in the electrically conductive connection, the electrical conductors used for producing the electrically conductive connection should have a good electrical conductivity. Therefore, metals, such as copper or aluminum, are used as materials for the electrical conductors in particular. As a rule, aluminum is preferred for cost reasons.
  • A disadvantage of these metallic materials used is the relatively low mechanical strength and, at the atomic level, the increased number of slip planes in the lattice structure. Due to this increased number of slip planes, these materials, in particular when using the above-mentioned screw connections for the electrically conductive connection of battery cells and / or electrical components with battery cells, plastic creep deformation processes offer less resistance, which is why such plastic Kriechverformungsprozesse often occur.
  • These plastic creep deformation processes under electrical and mechanical stress are highly undesirable. Because of these Kriechverformungsprozesse worsens over time, the electrical contacting of the electrically conductive compounds. This is due in particular to the fact that the contact pressure with which the electrical conductor is pressed by the screw connection against the electrode connection is reduced due to the outflow of material occurring due to the creep deformation processes. If the contact pressure in the contacted region falls below certain limit values, the electrical contact contact resistance thereby increases sharply. As a result of the increased contact resistance, the resistive losses increase in the electrical conductor, so that the current-carrying electrical conductor heats up quickly. Due to this Joule heat, the problem of plastic creep deformation processes is further intensified, since creeping already occurs at temperatures in a temperature range of approximately 80.degree. C. to 100.degree. C., especially in the case of light metal alloys, such as aluminum alloys. By unfavorable material combinations and small-area contacts in the electrically conductive connection, the problem of reducing the contact pressure and the concomitant increase in the electrical contact resistance is compounded. A safe and proper operation of the electrically conductive connection and thus ultimately the battery module or the high-performance vehicle battery is no longer given.
  • From the publication KR 1020080042964 A is the electrical contacting using a pressing element known, wherein a reduction of the electrical contact resistance is to be effected by the pressing element.
  • It is also known to use nuts to increase the contact pressure together with metallic disc springs. For example, in the document DE 35 20 855 C1 such disc springs used together with a nut for a uniform press-contacting a galvanic cell.
  • Against this background, it is an object of the present invention to provide a device for fixing a planarized electrical conductor to an electrode terminal of a battery cell, the device in particular to compensate for the effects of Kriechverformungsprozessen the electrical conductor. In particular, the device should help, despite plastic creep deformation of the electrical Ladder to provide the necessary for a low electrical contact resistance contact force.
  • Disclosure of the invention
  • To achieve the object, a device for fixing a flat-shaped electrical conductor, in particular a cell or module connector, proposed at an electrode terminal of a battery cell, wherein the device comprises a screw with a screw thread for placement on an electrode terminal and a first planarized compensation element, wherein the first compensating element is mechanically biased and centered with respect to the screw thread of the screw element is arranged on the screw, and wherein at the outer boundary of the first compensating element, a second flat compensating element is arranged below the first compensating element. Advantageously, creep deformation processes, in particular settling and relaxation processes, of the electrical conductor are compensated by the elastic spring effect of the mechanically biased first compensation element in the case of a device arranged correspondingly on an electrode connection. By the second compensating element, the spring action and thus the contact pressure is exerted by the first compensating element in fixing an electrical conductor, advantageously evenly transmitted to the contacting point. As a result, a more uniform electrically conductive contact is advantageously achieved, so that in particular by the interaction of the first compensating element and the second compensating element when screwed to an electrode terminal screw a permanent uniformly low electrical contact resistance is achieved by the electrode connection to the electrical conductor. The first compensating element and the second compensating element are preferably designed such that they, at least in the assembled state, ie after a compensation of the curvature of the first compensating element by the mechanical bias, are equal in area.
  • In particular, it is provided that the screw element of the device is a screw, preferably in the manner of a screw bolt, and that the screw thread of the screw element is designed as an external thread for screwing into an internal thread of an electrode connection. According to a preferred embodiment variant of the invention it is provided that the screw element is designed as a nut, wherein the screw thread of the screw is formed as an internal thread. In this embodiment variant, it is provided that the device can be screwed onto an external thread of an electrode connection by means of the screw element designed as a screw nut. The compensation elements are preferably each ring-shaped, wherein the inner radius is dimensioned such that the compensation elements can be arranged substantially accurately to the outer thread of the screw or the electrode terminal. The outer radius of the compensating elements is preferably in each case determined such that the area between the inner radius and the outer radius substantially corresponds to the contacting area of the electrode terminal.
  • Advantageously, the screw element has a projection or a nose, such that an annular gap is formed on the screw element by the projection or the nose. If the screw element is designed as a nut, then the projection can be formed in particular by a corresponding deformation of the nut collar. In particular, the projection or the nose but also in other ways, for example, by forming a plastic clip an annular gap.
  • By formed by the projection or the nose annular gap, the first compensating element is advantageously held by the screw, preferably rotatably supported. Furthermore, the compensating element is advantageously preassembled arranged on the screw by this projection or this nose, whereby the handling of the device is advantageously simplified. In particular, it is provided that for holding the first compensation element in the gap, the first compensation element is advantageously narrower in its inner boundary with respect to its thickness, preferably with a shoulder, such that the projection is arranged in the recess formed by the shoulder when the Device fixed the electrical conductor by screwing to the electrode connection.
  • According to a particularly advantageous embodiment of the invention it is provided that the device according to the invention is integrally formed. As a result, the handling is advantageously further simplified. In addition, the one-part construction offers the advantage that the individual components of the device, in particular the screw element, the first compensating element and the second compensating element, can not fall down during assembly on an electrode connection, and thus unintentionally contact an electrically conductive component and thereby occasionally one Cause short circuit.
  • A further advantageous embodiment of the invention provides that the first compensation element is designed in the manner of a plate spring. This makes it possible to achieve a particularly good compensation of elastic creep deformations under the influence of the first compensation element. The second compensating element is in this case pressed by the mechanical bias of the plate spring with high contact pressure on the flat-shaped electrical conductor, whereby advantageously a good electrical contact between the electrode terminal and the electrical conductor is achieved. As the first compensation element can in particular one after DIN 6796 standardized clamping disc can be used. Preferably, the first compensating element is made of a spring steel or spring steel. As a result, the mechanical bias is advantageously further increased and advantageously increases the contact pressure on the second compensation element.
  • A further advantageous embodiment of the invention provides that the second compensation element is designed in the manner of a washer. By the second compensating element, the contact surface is advantageously increased with the electrical conductor to be fixed. In addition, the surface pressure caused by the first compensating element is distributed more uniformly over the contacting region of the device by the second compensating element. The second compensating element can also be designed in the manner of a plate spring according to a design variant, but a design in the manner of a washer is preferred.
  • According to a further advantageous embodiment of the invention, the outer boundary of the first compensating element and the outer boundary of the second compensating element are surrounded by a fastening element, wherein the second compensating element is arranged by the fastening element on the first compensating element.
  • Advantageously, the fastening element surrounds the edge region of the respective outer boundary. This means that the fastening element is in this case arranged partially on the surface of the first compensating element and partly on the lower surface of the second compensating element. Advantageously, the fastener thereby allows a displacement of the compensating elements against each other, at least to a small extent, in particular by up to 2 mm (mm: millimeters) to. Preferably, the fastening element is designed such that it also acts as a sealing element. Characterized in that the fastening element engages around the edge region of the outer boundary of the second compensating element, the fastening element is thus advantageously formed to seal the contact surface between the second compensating element and the electrical conductor to be fixed and thus to prevent corrosion of the contact point, in particular electrochemical corrosion or at least limit.
  • Advantageously, the fastening element is formed from a dimensionally stable, elastically moldable plastic. In particular, it is provided that the fastening element is a belt-like elastomer, which is arranged around the outer boundary of the first compensating element and the second compensating element. Advantageously, the fastening element also prevents impurities from accumulating between the compensating elements.
  • To solve the above-mentioned object, a battery module with a plurality of battery cells is further proposed, wherein the battery cells each have at least one electrode terminal with a screw, wherein at least one electrode terminal of a battery cell is electrically conductively contacted by means of a flat electrical conductor and wherein the electrical Head is fixed with a device according to the invention for fixing a flat-shaped electrical conductor to the electrode terminal of the battery cell. In this case, the screw element of the device with the electrode connection is advantageously screwed such that the second compensating element is contacted with the electrical conductor. By the first compensating element thereby advantageously exerted by the second compensating element on the electrical conductor contact pressure is increased. The battery cells are preferably lithium-ion cells, in particular rechargeable lithium-ion cells. Preferably, the battery cells are formed as prismatic cells.
  • Further advantageous details, features and design details of the invention are explained in more detail in connection with the embodiment shown in the figures. Showing:
  • 1 in a schematic representation of a sectional side view of an embodiment of a device according to the invention, wherein the device is pre-mounted on an electrode terminal, but the screw of the device is not yet tightened; and
  • 2 in a schematic representation of a sectional side view of the in 1 illustrated embodiment, wherein the screw of the device tightened and the device is thus mounted on the electrode terminal.
  • In 1 is a device 1 for fixing a flat electrical conductor 2 at an electrode connection 3 a battery cell shown in a pre-assembled state. This is a screw 4 the device 1 , which is presently designed as a nut on an external thread 5 an electrode connection 3 screwed. The device 1 points next to the screw 4 a first compensation element 6 and a second compensating element 7 on. The first compensation element 6 and the second compensation element 7 are flat and each have an opening through which the electrode connection 3 with the external thread 5 protrudes. The first compensation element 6 and the second compensation element 7 are thus with respect to the internal thread of the screw 4 or with respect to the external thread 5 of the electrode connection 3 centered. The first compensation element 6 is mechanically biased in the manner of a plate spring and is preferably made of a spring steel. Will the screw 4 the device 1 further screwed and thus tightened must therefore against the force of the first compensation element 6 be worked plate spring formed. The second compensation element 7 is preferably designed in the manner of a washer and may for example be made of steel.
  • The screw element 4 the device 1 has a lead 12 on, through which an annular gap is formed, in which the first compensation element 6 with its inner limitation 13 intervenes. For this purpose, the compensation element at its inner boundary 13 a paragraph on, with the projection 12 is arranged in the recess formed by the shoulder. By means of the projection 12 is the first compensation element 6 on the screw 4 with respect to the internal thread of the screw 4 centered.
  • At the outer limit 8th of the first compensation element 6 is the second compensation element 7 by means of a fastener 10 below the first compensating element 6 arranged. Here are the outer boundary 8th of the first compensation element 6 and the outer boundary 9 of the second compensating element 7 from the fastener 10 surrounded like a belt. The fastener 10 encompasses the edge area of the outer boundary 8th of the first compensation element 6 and the edge area of the outer boundary 9 of the second compensating element 7 , The fastener 10 is made of a dimensionally stable, elastically deformable plastic, preferably an elastomer. The fastener 10 allows by its design, a displacement of the compensation elements 6 . 7 against each other, at least to a small extent of a few tenths of a millimeter, too. The fastener 10 can in other embodiments of the device 1 but in particular also be designed such that larger shifts or no shifts are allowed. Through the fastener 10 is the gap 11 between the first compensation element 6 and the second compensating element 7 tightly closed. Foreign substances can not or only with difficulty between the first compensation element 6 and the second compensation element 7 reach. In addition, the fastener seals 10 through the overlap at the outer boundary 9 of the second compensating element 7 the contacting surface between the electrical conductor 2 and the second compensating element 7 and protects the contact surface thus advantageously against corrosion. The outer limits 8th . 9 but especially with respect to the rest of the respective compensation element 6 . 7 be formed thin surface, such that the fastener 10 not about the respective compensation element 6 . 7 survives.
  • In 2 is the device 1 in a mounted state with tightened nut 4 shown, so that the device 1 the flat electrical conductor 2 at the electrode terminal 3 fixed. The first compensation element 6 increases due to the spring action on the electrical conductor 2 applied contact pressure. Advantageously, creep deformation processes, settling and / or relaxation processes, of the electrical conductor 2 by the elastic spring effect of the mechanically biased first compensation element 6 balanced. The second compensation element 7 contributes in particular to a more uniform pressure distribution of the first compensation element 6 exerted pressure and compensates in particular local pressure peaks. Through the compensation elements 6 and 7 is also the contact surface with the electrical conductor 2 compared to a screw, which uses only one screw increases. Through the interaction of the first compensation element 6 and the second compensating element 7 becomes a permanent uniformly low electrical contact resistance from the electrode terminal 3 on the electrical conductor 2 achieved.
  • The illustrated in the figures and explained in connection with this embodiment is illustrative of the invention and is not limiting for this.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • KR 1020080042964 A [0006]
    • DE 3520855 C1 [0007]
  • Cited non-patent literature
    • DIN 6796 [0014]

Claims (8)

  1. Contraption ( 1 ) for fixing a flat electrical conductor ( 2 ), in particular a cell or module connector, at an electrode connection ( 3 ) of a battery cell, the device ( 1 ) a screw element ( 4 ) with a screw thread for placement on an electrode terminal ( 3 ) and a first flat compensating element ( 6 ), wherein the first compensation element ( 6 ) is mechanically biased and with respect to the screw thread of the screw ( 4 ) centered on the screw element ( 4 ), characterized in that at the outer boundary ( 8th ) of the first compensating element ( 6 ) a second flat compensating element ( 7 ) below the first compensating element ( 6 ) is arranged.
  2. Contraption ( 1 ) according to claim 1, characterized in that the first compensating element ( 6 ) is designed in the manner of a plate spring.
  3. Contraption ( 1 ) according to one of the preceding claims, characterized in that the first compensating element ( 6 ) is made of a spring steel.
  4. Contraption ( 1 ) according to one of the preceding claims, characterized in that the second compensating element ( 7 ) is designed in the manner of a washer.
  5. Contraption ( 1 ) according to one of the preceding claims, characterized in that the outer boundary ( 8th ) of the first compensating element ( 6 ) and the outer boundary ( 9 ) of the second compensating element ( 7 ) of a fastener ( 10 ), wherein the second compensation element ( 7 ) by the fastener ( 10 ) on the first compensating element ( 6 ) is arranged.
  6. Contraption ( 1 ) according to claim 5, characterized in that the fastening element ( 10 ) the edge area of the outer boundary ( 8th . 9 ) each encompasses.
  7. Contraption ( 1 ) according to claim 5 or claim 6, characterized in that the fastening element ( 10 ) is made of a dimensionally stable, elastically deformable plastic.
  8. Battery module with a plurality of battery cells, wherein the battery cells each have at least one electrode terminal ( 3 ) with a screw thread ( 5 ) and wherein at least one electrode connection ( 3 ) of a battery cell by means of a flat electrical conductor ( 2 ) is electrically conductively contacted, characterized in that the electrical conductor with a device ( 1 ) according to one of claims 1 to 7 on the electrode connection ( 3 ) of the battery cell is fixed.
DE201310200282 2013-01-11 2013-01-11 Fixing device e.g. cell connector, for fixing planar electric conductor at electrode connection of rechargeable lithium-ion cell of high power-vehicle-battery, has compensating element arranged below another compensating element at boundary Pending DE102013200282A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE201310200282 DE102013200282A1 (en) 2013-01-11 2013-01-11 Fixing device e.g. cell connector, for fixing planar electric conductor at electrode connection of rechargeable lithium-ion cell of high power-vehicle-battery, has compensating element arranged below another compensating element at boundary

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201310200282 DE102013200282A1 (en) 2013-01-11 2013-01-11 Fixing device e.g. cell connector, for fixing planar electric conductor at electrode connection of rechargeable lithium-ion cell of high power-vehicle-battery, has compensating element arranged below another compensating element at boundary

Publications (1)

Publication Number Publication Date
DE102013200282A1 true DE102013200282A1 (en) 2014-07-17

Family

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DE201310200282 Pending DE102013200282A1 (en) 2013-01-11 2013-01-11 Fixing device e.g. cell connector, for fixing planar electric conductor at electrode connection of rechargeable lithium-ion cell of high power-vehicle-battery, has compensating element arranged below another compensating element at boundary

Country Status (1)

Country Link
DE (1) DE102013200282A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3520855C1 (en) 1985-06-11 1986-09-04 Deutsche Automobilgesellsch Galvanic cell with press contacting
KR20080042964A (en) 2006-11-13 2008-05-16 주식회사 엘지화학 Electrical connecting structure having low contact resistance

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3520855C1 (en) 1985-06-11 1986-09-04 Deutsche Automobilgesellsch Galvanic cell with press contacting
KR20080042964A (en) 2006-11-13 2008-05-16 주식회사 엘지화학 Electrical connecting structure having low contact resistance

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DIN 6796

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