Classifications

• • 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
  • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
  • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
  • H01M50/627—Filling ports
  • H01M50/636—Closing or sealing filling ports, e.g. using lids
  • H01M50/645—Plugs
• • 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
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/147—Lids or covers
• • 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
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/183—Sealing members
  • H01M50/184—Sealing members characterised by their shape or structure
• • 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
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/183—Sealing members
  • H01M50/186—Sealing members characterised by the disposition of the sealing members
• • 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
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/183—Sealing members
  • H01M50/19—Sealing members characterised by the material
  • H01M50/193—Organic material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
  • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

• the present invention relates to a battery cell, in particular a lithium-ion battery cell.
• the invention further relates to a motor vehicle with such a battery cell.
• Battery cells sometimes referred to as accumulator cells, are used for the chemical storage of electrically provided energy. Even today, battery cells are used to power a variety of mobile devices. In the future, battery cells will be used, among other things, to supply energy to mobile devices
• Electric vehicles or hybrid vehicles both on land and on water, or for stationary intermediate storage of electricity derived from alternative energy sources.
• a plurality of battery cells is usually assembled into battery packs.
• battery cells with a prismatic primarily battery cells with a prismatic
• a battery cell in particular a lithium-ion battery cell having at least one winding element, an electrolyte, two current collector and a housing.
• the winding element consists of a wound stack of a first foil coated with anode material, for example of copper, a second foil coated with cathode material, for example of aluminum, and two plastic foils serving as diaphragms.
• One of the current collectors is electrically conductively connected, for example welded, to the first foil of the wetting element.
• the second current collector is electrically conductively connected to the second foil of the winding element.
• the housing has a metallic container and a largely metallic lid assembly.
• the container has an opening through which the winding element and the two current collectors can be introduced into the housing during the manufacture of the battery cell.
• the lid assembly is adapted to the
• Cover assembly inter alia, a cover plate which can largely close the opening in the container and which for hermetically closing the
• the Housing can be connected to the container, for example by a weld.
• the cover plate has, inter alia, a filling opening, through which electrolyte can be filled into the housing.
• the proposed battery cell is characterized in that the filling opening is closed with a sealing plug, wherein the sealing plug is held in the filling opening by means of an adhesive and a sealing arrangement prevents the electrolyte filled into the housing from coming into contact with the adhesive.
• the cover plate When attaching the lid assembly, the cover plate is first connected to the container, for example by welding.
• the filling opening provided in the cover plate then charges electrolyte into the container so that it can wet the winding element received therein. Subsequently, the filling opening must be hermetically sealed and resistant to the electrolyte
• An adhesive is provided between the sealing plug and an adjacent surface of the cover plate in the region of the filling opening. After curing, this adhesive ensures that the sealing plug in the filling opening is mechanically held.
• the adhesive fixes the closure plug within the filling opening so tightly that even with an increased internal pressure within the battery cell housing of, for example, more than 6000 hPa, there is no danger that the closure plug will come off the filling opening.
• the battery cell has an additional sealing arrangement, which prevents the adhesive from coming into contact with the electrolyte.
• the sealing arrangement can be realized in different ways.
• the cover plate at the filling opening may have a projecting into the housing projection and the closure plug may be inserted into this projection, wherein the closure plug at a first portion of a lateral surface with an inner surface of the Projection can be glued.
• a sealing bead exhibit.
• This sealing bead can, for example, surround the sealing plug in an annular manner and ensure a reliable sealing between the sealing plug and a further inner region of the projection of the cover plate in the region of the filling opening.
• the sealing arrangement in particular the sealing bead described above, can be designed with an elastomer resistant to the electrolyte.
• an elastomer may contain, for example, a fluoropolymer.
• a fluoropolymer For example, from the company DuPont a against many electrolytes resistant elastomer under the
• a sealing arrangement can be produced by providing a lower end of the in the region of the filling opening on the cover plate
• Sealing plug in a second portion, which is relative to the first portion of the lateral surface, which is adhesively bonded to the inner surface of the projection, closer to the interior of the housing comes into abutment.
• Projection can form, for example, a sharp edge, which closely conforms to a lateral surface of the sealing plug accommodated in the projection and thereby prevents electrolyte from reaching the bond arranged above it.
• the sealing plug can be at the lower end below the second
• Subarea have a Ein Industriesfase.
• the Ein Industriesfase can at the lower end of the sealing plug form a downwardly tapered area, using which can be successively pressed outwardly during insertion of the sealing plug into the projection of the inwardly bent portion of the projection.
• the inwardly bent portion of the projection whose cross section may be slightly smaller than the cross section of the sealing plug in the second portion, can thus be widened by the Einticianfase so that it conforms under mechanical tension to the lateral surface of the sealing plug.
• Both the filling opening and the sealing plug can be a round
• closure plug may then be at least partially cylindrical. Due to the rotational symmetry, such filling openings and sealing plugs can be produced easily.
• the stopper may have a laterally projecting beyond the opening collar. This covenant may occur when inserting the
• Closing plug into the filling hole serve as a mechanical stop, to prevent the plug is inserted too deeply into the filling opening or even pushed through the filling opening into the interior of the battery cell.
• the adhesive used to bond the sealing plug to the cover plate may be a microencapsulated adhesive.
• Such microencapsulated adhesives contain tiny capsules filled with an adhesive substance. The microencapsulated adhesive can even before mounting the battery cell on surfaces to be bonded to the
• Sealing plug and / or the cover plate are applied. When fitting the sealing plug into the filling opening, the microencapsulation is destroyed, so that the adhesive is released and after curing, the surfaces to be bonded mechanically stable. Microencapsulated adhesives are also used, for example, to secure screwed connections
• microencapsulated adhesive is sold under the trademark Loctite®.
• Fig. 1 shows an exploded view of a lithium-ion battery cell.
• FIG. 2 shows a cross-section of a sealing plug for a battery cell inserted into a filling opening of a cover plate according to an embodiment of the present invention.
• FIG. 3 shows a cross section of a sealing plug for a battery cell inserted into a filling opening of a cover plate according to another embodiment of the present invention.
• FIG. 4 shows a motor vehicle with a battery according to an embodiment of the present invention.
• Fig. 1 shows a conventional lithium-ion battery cell in an exploded view. It can be seen that the battery cell consists of a large number of individual components. Only the components necessary for the understanding of embodiments of the invention and their features are described herein, a description of the remaining components of the battery cell is omitted.
• the battery cell 1 has at least one winding element 3 with a wound stack 5 of a copper foil, which is coated with anode material, and a
• Aluminum foil which is coated with cathode material, and intervening plastic films, which serve as diaphragms on.
• the copper foil and the aluminum foil along the winding axis in the opposite direction slightly staggered stacked, so that the copper foil on a narrow side and the aluminum foil on a
• a current collector 7 made of copper is welded, so that this current collector is electrically connected to the anode of Wckelelements.
• a second current collector 9 made of aluminum is welded to make electrical contact with the cathode of the winding element 3.
• the winding element 3 provided with the two current collectors 7, 9 is then introduced through an opening 14 into an upwardly open, cuboidal container 13.
• the container 13 is then provided with a lid assembly 15 in addition to a cover plate
• the cover plate 23 still includes several other components, closed.
• the cover plate 23 is welded with its edge to an inner surface of the container.
• the container 13 as well as the cover plate 23 are formed of sheet metal to withstand, inter alia, the chemically aggressive electrolyte can.
• the cover plate 23 has, among other things, a filling opening 25, through which electrolyte can be filled into the interior of the housing 1 formed by the container 13 and the lid assembly 15, after the cover plate 23 has been fastened to the container 13.
• the filling opening 25 may be formed, for example, with a round cross section and have a diameter of about 5 mm.
• FIGS. 2 and 3 show alternative ways of closing the filling opening 25 of a battery cell according to embodiments of the present invention
• An inner edge of the filling opening 25 of the cover plate 23 is bent downward, for example, by a bending process, a deep-drawing process or an embossing process, so that a protrusion 29 projecting inwards into the housing 11 forms.
• This projection 29 may preferably have a round cross section, so that an inner surface 30 of the projection 29 has a cylindrical geometry.
• the projection can be, for example, 3 mm to 5 mm in the interior of the housing
• a sealing plug 27 is inserted after the filling of the electrolyte.
• the closure plug 27 has an outer contour that corresponds approximately to the inner contour of the projection 29.
• the sealing plug 27 has a likewise cylindrical shank 26 whose diameter is at most slightly smaller than an inner diameter of the projection 29.
• the sealing plug 27 has at its upper end, that is, the end remaining outside the housing 11 laterally over the filling opening 25 projecting collar 39.
• an adhesive 31 preferably a microencapsulated adhesive, is provided on an outer surface 28 of the shaft 26 of the sealing plug 27 .
• Projection 29 are dimensioned so that the adhesive 31 comes into contact with the inner surface 30 of the projection 29 during insertion of the sealing plug 27 and optionally a microencapsulation is opened. After hardening of the adhesive 31, this thus ensures a stable fixation of the sealing plug 27 within the projection 29 of the filling opening 25.
• a sealing arrangement 35 is provided below the adhesive 31, that is, closer to the interior of the housing 11.
• this sealing arrangement 35 is formed by means of an elastomer which surrounds the shaft in a ring-shaped manner and forms a sealing bead 33.
• This elastomer is on the one hand chemically resistant to the electrolyte and on the other hand has sufficient elasticity to provide a reliable seal between the inner surface 30 of the projection 29 and the lateral surface 28 of the shaft 26 of the sealing plug 27.
• the elastomer can be received in a groove 37, for example in the form of an O-ring and thus against an axial
• sealing plug 27 For manufacturing the sealing plug 27, automatic turning can be used. As a fit between the sealing plug 27 and the filling opening 25, for example H7 / r6 can be selected, which corresponds to a slight pressure.
• the sealing bead 33 may, for example, 0.03 mm with a tolerance of 0.01 mm in
• FIG. 3 shows an alternative embodiment for closing the filling opening 25 with the aid of a sealing plug 27.
• a seal between the projection 29 and the shaft 26 of the sealing plug 27 is accomplished here directly via a suitable configuration of the projection 29.
• a lower end 41 of the projection 29 is bent toward the center of the filling opening 25 such that the inner diameter of the projection 29 in this area is slightly smaller than the outer diameter of the shaft 26 of the sealing plug 27 before it is inserted into the projection 29.
• a taper in the form of a cylinder-stump-like Ein Industriesfase 45 is provided at a lower end of the shaft 26, a taper in the form of a cylinder-stump-like Ein Industriesfase 45 is provided.
• the inwardly bent edge region 41 of the projection 29 can be widened outwards during the insertion of the sealing plug 27 into the filling opening 25.
• an edge 43 at the lower end 41 of the projection 29 as a sealing arrangement 35 against the electrolyte seal against the shaft 26 of the sealing plug 27 create.
• sealing plug 27 can be used for manufacturing, for example, a cold striking. As a fit again H7 / r6 can be selected.
• H7 / r6 can be selected.
• the closure stopper is simply pressed into the filling opening 25 and held in the filling opening 25 by means of the possibly microencapsulated adhesive 31, which may have been previously applied, if possible.
• the sealing arrangement 25 prevents the adhesive 31 from being contacted and attacked by the electrolyte.
• FIG 4 shows a motor vehicle 100 with a battery 102, which is composed of several of the battery cells 1 described above.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Sealing Battery Cases Or Jackets (AREA)
• Battery Mounting, Suspending (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=48875682

Family Applications (1)

Country Status (3)

Families Citing this family (2)

Citations (3)

Family Cites Families (4)

• 2012
  • 2012-09-14 DE DE102012216477.4A patent/DE102012216477A1/de not_active Withdrawn
• 2013
  • 2013-07-30 WO PCT/EP2013/065963 patent/WO2014040789A1/fr not_active Ceased
  • 2013-07-30 CN CN201380047827.1A patent/CN104620421B/zh not_active Expired - Fee Related

Patent Citations (3)

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