WO2013023767A1

WO2013023767A1 - Electrochemical energy storage cell having a metallic housing and method for producing an electrochemical energy storage cell having a metallic housing

Info

Publication number: WO2013023767A1
Application number: PCT/EP2012/003411
Authority: WO
Inventors: Tim Schaefer
Original assignee: Li-Tec Battery Gmbh
Priority date: 2011-08-17
Filing date: 2012-08-09
Publication date: 2013-02-21
Also published as: DE102011110695A1

Abstract

An electrochemical energy storage device according to the invention, also referred to below as a secondary cell, comprises an electrode assembly. The electrode assembly comprises at least a separator and two electrodes of differing polarity. The separator is arranged between two electrodes. The electrode assembly is provided in order to supply electrical energy at least intermittently. The secondary cell also comprises one, two or a plurality of current collectors. A current collector is provided in order to be connected to the electrode assembly in an essentially electrically conductive manner, preferably to one of the electrodes and preferably by means of a material-fitting connection, more preferably by means of a welded connection. The secondary cell further comprises at least two, in particular metallic, molded housing parts. The molded housing parts are provided in order to delimit the electrode assembly with respect to the surroundings of the secondary cell. The molded housing parts are also provided for the essentially form-fitting and/or material-fitting connection to one another, wherein, preferably, the connected molded housing parts form a housing around the electrode assembly. At least one, preferably two current collectors are connected to a molded housing part in an essentially form-fitting and/or material-fitting manner, in particular to the same molded housing part. At least one of the molded housing parts is provided in order to accommodate the electrode assembly in an essentially form-fitting and/or force-fitting manner.

Description

Electrochemical energy storage cell with metallic housing, process for producing an electrochemical

Energy storage cell with metallic housing

Description

Hereby, the entire contents of the priority application DE 10 201 1 1 10 695 by reference is part of the present application.

The present invention relates to a rechargeable electrochemical energy storage cell, hereinafter referred to as a secondary cell, for a battery. The invention will be described in the context of lithium-ion batteries for the supply of motor vehicle drives. It should be noted that the

Invention can also be used regardless of the chemistry of the secondary cell or regardless of the type of powered drive.

Batteries with a plurality of secondary cells for supplying electrical consumers, in particular motor vehicle drives, are known from the prior art. The secondary cells each have a housing, a

Electrode assembly for providing electrical energy and usually two current conductors on. The current conductors extend at least partially out of the housing into the environment of the secondary cell. Within the housing, the electrode assembly and the current conductors are electrically conductive

connected with each other. The inadequate lifetime of some types of batteries can sometimes cause problems. It is an object of the invention to provide batteries with increased lifetime.

The object is achieved by an electrochemical energy storage device according to claim 1. Claim 10 describes a battery with at least two electrochemical energy storage devices according to the invention. The object is also achieved by a manufacturing method according to claim 1 1 for an electrochemical energy storage device. To be preferred

Further developments of the invention are the subject of the dependent claims.

An inventive electrochemical energy storage device, hereinafter referred to as a secondary cell, has an electrode assembly. The electrode assembly has at least one separator and two electrodes of different polarity. The separator is arranged between two electrodes. The electrode assembly is provided to provide at least temporary electrical energy. Furthermore, the secondary cell has one, two or more current conductors. A current collector is provided, at least indirectly, to be electrically conductively connected to the electrode assembly, preferably to one of the electrodes, preferably by means of a material connection, particularly preferably by means of a welded connection. Furthermore, the secondary cell has at least two, in particular, metallic housing moldings. The housing moldings are for limiting the electrode assembly from the environment of

Secondary cell provided. The housing moldings are also provided with one another for the in particular positive and / or material-locking connection, wherein preferably the connected housing moldings form a housing around the electrode assembly. At least one, preferably two

Current conductors are connected to a housing molding in particular non-positively and / or cohesively, preferably with the same

Body molding. At least one of the housing moldings is provided to receive the electrode assembly in particular positive and / or non-positive. In the inventive design of the secondary cell whose current conductor are held by a housing molding such that an undesirable

Relative movement between the current collector and housing molding is counteracted. Further, the electrode assembly of one of the housing moldings is held such that an undesired relative movement of the electrode assembly is counteracted with respect to the current conductor or the housing. If a secondary cell according to the invention is exposed to vibrations and / or shocks in particular in the operating state, then the inventive design of the secondary cell of a mechanical stress of the electrical

Connections of electrode assembly and current conductors against. This design offers the advantage that aging of the electrical connections of the electrode assembly and current conductors in particular due

mechanical stress or alternating stress is met. This increases the life of a secondary cell and solves the underlying problem.

An electrode assembly in the sense of the invention means a device which is used in particular for providing electrical energy. For this purpose, the electrode assembly has at least two electrodes

different polarity, wherein the electrodes are criticized by a separator. The electrode assembly is dischargeable and rechargeable, with ions of the electrolyte's conducting electrolyte migrating through the separator. When the secondary cell is charged, a conversion of supplied electrical energy into chemical energy takes place in the electrode assembly. During discharge, chemical energy in the electrode assembly is converted into electrical energy. The electrode assembly has at least one so-called lateral surface, wherein the lateral surface delimits the electrode assembly to the environment or to a housing molding.

An electrode has a particular metallic collector foil. An active electrode mass is applied to the collector foil. Preferably, a portion of the collector foil remains free of the active electrode mass. This Area, also referred to below as the arrester lug, is used in particular for electrical connection to a current conductor. Preferably, the trap tab extends beyond an adjacent separator. Preferably, a collector foil has a substantially rectangular shape. The secondary cell according to the invention preferably has lithium ions. This version offers the advantage of an increased energy density of

Secondary cell, in particular an energy density of at least 40 Wh / kg.

In a further embodiment, at least one electrode of the

Electrode assembly, more preferably at least one cathode, a compound having the formula LiMP0 ₄ , wherein M at least one

Transition metal cation of the first row of the Periodic Table of the Elements is. The transition metal cation is preferably selected from the group consisting of Mn, Fe, Ni and Ti or a combination of these elements. The

Compound preferably has an olivine structure, preferably

parent olivine, with Fe being particularly preferred. This

Embodiment offers the advantage of an increased number of sustainable

Charge change of the electrode.

In a further embodiment, preferably at least one

Electrode of the electrode assembly, more preferably at least one cathode, a lithium manganate, preferably LiMn ₂ 0 ₄ spinel type, a lithium cobaltate, preferably LiCo0 ₂ , or a lithium nickelate, preferably LiNi0 ₂ , or a mixture of two or three of these oxides, or

Lithium mixed oxide containing manganese, cobalt and nickel on.

A separator is used in particular for the complaint of two adjacent electrodes of different polarity. The separator blocks electrons, but is permeable to ions. The electrolyte or the conductive salt are at least partially taken up by the separator. Preferably, the separator is as formed thin film, more preferably having a substantially rectangular shape.

Preferably, a separator is used which is not or only poorly electron-conducting, and which at least partially

permeable carrier. The support is preferably coated on at least one side with an inorganic material. As at least partially permeable carrier, an organic material is preferably used, which is preferably designed as a non-woven fabric. The organic material, which preferably comprises a polymer and more preferably a polyethylene terephthalate (PET), is with a

coated inorganic, preferably ion-conducting material, which is more preferably ion conducting in a temperature range of - 40 ° C to 200 ° C. The inorganic material preferably comprises at least one compound from the group of oxides, phosphates, sulfates, titanates, silicates, aluminosilicates with at least one of the elements Zr, Al, Li, particularly preferably zirconium oxide. The inorganic, ion-conducting material preferably has particles with a largest diameter below 100 nm. Such a

Separator is sold, for example, under the trade name "Separion" by Evonik AG in Germany. A preferred embodiment of the electrode assembly comprises a plurality of positive electrodes and a plurality of negative electrodes, wherein adjacent electrodes of different polarity are separated by a respective separator. The electrodes and the separators are substantially formed as rectangular sheets and corresponding to a stack of playing cards

stacked one above the other, this arrangement being called electrode stack below. In the electrode stack, a separator sheet separates two each

Electrode sheets of different polarity. Beyond the separator sheet, the collector tabs of the adjacent electrodes extend. The

Ableitfahnen a polarity are electrically connected to one of the current collector, preferably welded. A further preferred embodiment of the electrode assembly comprises a positive electrode and a negative electrode, wherein adjacent electrodes of different polarity are separated by a respective separator. The electrodes and the separator are essentially formed as rectangular strips and placed one above the other. This arrangement is wound up into a substantially cylindrical so-called electrode winding. Beyond the separator, the arrester lugs of the two electrodes extend. The

Ableiterfahnen a polarity are electrically connected to one of the current collector, preferably welded. Preferably, the first is in

Substantially cylindrical electrode winding deformed into a so-called. Electrode flat winding, the electrode flat winding assumes a substantially cuboidal or prismatic shape. This embodiment offers the advantage that a cuboid housing can be used for the electrode flat winding, the cuboid housing being particularly suitable for the adjacent housing

Arrangement of two secondary cells in a battery is suitable.

Under a current conductor in the context of the invention is a device to understand, which in particular the electrical contact of the

Electrode assembly and in particular for connection to a zu

serving consumers. Preferably, the current conductor is formed metallic, particularly preferably with copper and / or aluminum. Of the

Current conductor is at least indirectly electrically conductive with the

Electrode assembly connected, preferably with an electrode of

Electrode assembly. Preferably, the current collector extends at least partially from a housing molding in the environment of the secondary cell.

The current conductor preferably has a supply contact region which extends at least partially outside a housing molding. The supply contact area is for connection to a supply line

designed, in particular a busbar. Particularly preferably, a lead contact region is formed substantially cylindrical and has an external thread. An eye or a hook at the end of a power cable can surround the lead contact area and with a be screwed mother screwed. Preferably, the

Stromableiter a substantially plate-shaped electrode contact area, which serves in particular for contacting the electrode assembly or an electrode, preferably via the Ableiterfahnen. The conductor tabs or the electrodes of one polarity are preferably bonded to the electrode contact area, particularly preferably welded.

Preferably, the electrode contact region is arranged in the interior of the housing. Preferably, a substantially rectangular

Boundary surface of the electrode contact region substantially parallel to a wall of a housing molding, hereinafter called Formteilwandung arranged. This embodiment has the advantage that a connection, in particular a welding of the collector lugs with this

Limiting surface is facilitated.

A preferred embodiment of the current collector has a in

Essentially as a cylindrical pin or bolt in particular with

External thread trained supply contact area. Next, this embodiment has a substantially plate-shaped

Electrode contact area with a substantially rectangular boundary surface within the housing. This embodiment offers the advantage that the number of material transitions in the current path from the electrode to the

Consumer is reduced by the arrester lug directly with the

Current conductor is connected. Another advantage of this embodiment is the improved sealing of the housing by an optionally

multi-part sealing device can be pushed over the bolt and secured. If the supply contact area is designed as a bolt with an external thread, referred to below as a threaded bolt, a deferred supply line can be secured with a nut. This version offers the

Advantage that at the same time a sealing device or insulation can be secured. Under a housing molding in the context of the invention is a device to understand, which serves in particular:

• limit the electrode assembly to the environment of the secondary cell,

• The electrode assembly in particular form-fitting and / or

frictionally received, preferably to clamp the electrode assembly,

• exchange heat energy with the electrode assembly,

preferably remove heat energy from the electrode assembly,

• with at least one other housing molding in particular

to be positively connected and / or materially connected,

• a current collector of the secondary cell with respect to the

To keep the electrode assembly substantially immovable, especially in shock or vibration,

• To hinder the escape of a component electrode assembly in the environment of the secondary cell, preferably to prevent, and / or

• to hinder the penetration of a substance from the environment of the secondary cell in the electrode assembly, preferably to prevent the entry of moisture.

"Form-fitting receiving the electrode assembly" in the context of the invention is to be understood that the housing molding in particular at the same time at least one, preferably a plurality of lateral surfaces of the

Electrode assembly is applied.

"Force-fitting the electrode assembly" in the sense of the invention is to be understood that the housing molding in particular exerts a normal force on the electrode assembly, in particular at least a lateral surface of the electrode assembly. From the normal force on the lateral surface and the static friction between the electrode assembly touching wall or molding wall follows a force, in particular a frictional force in the plane of the lateral surface, which is encountered in particular during operation of a relative movement between the electrode assembly and housing molding. Thus, a mechanical stress and thus an aging of the electrical connection of electrode assembly and

Electricity conductor counteracted.

The term "clamping of the electrode assembly" in the sense of the invention is to be understood in particular as meaning that the housing molding exerts a normal force on the electrode assembly, in particular on at least one lateral surface of the electrode assembly On the one hand and the electrode assembly on the other hand, a force in the plane of the lateral surface, with a relative movement between the electrode assembly and the housing molding is met

Electrode assembly and current arrester counteracted. By clamping the electrode assembly and its disintegration or disassembly counteracts during operation counteracts.

Preferably, a housing molding comprises at least one metal, more preferably a metal of the following group, which includes aluminum, copper, iron, steel. This version has the advantage that the

Housing molding provides a minimum protection of the electrode assembly from damaging mechanical influences, especially against the

Penetration of a foreign body into the electrode assembly. Another advantage is that the housing molding the cohesion of

Electrode assembly supported by the housing molding exerts a normal force on the electrode assembly. Another advantage is that the housing molding in particular due to its thermal conductivity of at least 40 W m ^"1 K ^{" 1 is} capable of dissipating heat from the electrode assembly.

Preferably, a housing molding with a cavity, below

Part molding called interior, and formed a molding opening, particularly preferably cup-shaped or cup-shaped. The molding interior is surrounded by a molding wall. The molding wall has at least two wall elements, the normal vectors of which are preferably arranged at an angle of substantially 90 ° to one another. Preferably that is

Housing molding formed with a substantially prismatic, cuboid or cylindrical shape. The shape of the housing molding is adapted to the shape of the electrode assembly, in particular is a

Dimension housing part depending on a nominal dimension of the electrode assembly. Preferably, the molding wall is dimensioned such that at least two wall elements touch the electrode assembly, more preferably a normal force on a lateral surface of the

Exercise electrode assembly. This design offers the advantage that the electrode assembly is received substantially immovable in the housing molding.

Preferably, a housing molding is essentially one

plate-shaped starting material produced, particularly preferably from a metallic plate-shaped starting material. Preferably, the housing molding by means of a forming process, a separation process and / or a

Joining method produced. Particularly preferably, the housing molding by means of deep drawing, pressing, embossing, cold forming, cold extrusion, folding, hemming, flanging, stamping, fine blanking, welding,

Resistance welding, seam seam welding, medium frequency welding,

Capacitor discharge welding, ultrasonic welding, brazing, brazing, soldering, gluing and / or combinations of these methods.

This manufacturing method has the advantage that the housing molding largely automated and repeatable with small deviations from the

Specified dimensions can be produced.

According to a first preferred embodiment, a housing molding with a cavity, hereinafter referred to molding part interior, and a first mold part opening is formed, particularly preferably cup-shaped or

cupped. Preferably, the housing molding is formed with a raised edge. This housing molding, in particular its

Molded part interior serves in particular for receiving the electrode assembly. Hereinafter, a according to this preferred embodiment

The molded part opening is used in particular as access to the molded part interior, whereby the molded part interior is surrounded by a molded part wall, wherein the first molded part wall has a plurality of wall elements each having a normal vector. At least two normal vectors are arranged at an angle of substantially 90 ° to each other Preferably, the housing molding is prismatic, particularly preferably substantially

cuboid shaped. Such a design of a housing molding offers the advantage that an electrode assembly can be accommodated in particular in a form-fitting manner. The housing molding, in particular its molding wall, is preferably dimensioned such that opposite lateral surfaces of the electrode assembly are each subjected to a normal force in the molding interior. This design has the advantage that the electrode assembly frictionally (s.o.) With a frictional force of

Housing molding is held.

According to a second preferred embodiment, a housing molding having a cavity, hereinafter referred to as the mold cavity interior, a second mold cavity opening and a mold guide region is preferably cup-shaped or cup-shaped. Preferably, the housing molding is with formed a raised edge. In particular, this serves

Housing molding for:

Closing a molding opening of another housing molding,

Area-by-area surrounding of the first molding part wall of another housing molding, in particular by means of the molding guide region

• Connect with another housing molding, preferably

cohesively.

Hereinafter, a according to this preferred embodiment

The molded part guide region is preferably adjacent to the second

Shaped part opening arranged. The molding interior is surrounded by a first molding part wall, wherein the first molding part wall more

Wall elements each having a normal vector. At least two normal vectors are arranged at an angle of substantially 90 ° to each other. Preferably, the housing molding is prismatic, more preferably formed substantially parallelepipedic. Preferably, the shape of this housing molding corresponds to the shape of another

Housing molding of the secondary cell. Preferably, this has

Housing molding on a metal, as stated above. Preferably, the second mold part wall, in particular its mold guide area is dimensioned so that a first mold part wall can be received with a predetermined gap, particularly preferably form-fitting manner. Preferably, the second mold part wall is dimensioned such that a transition fit or a small clearance fit between the female housing mold part and the closing housing mold part occurs when the female mold part

Housing molding is inserted into the molding guide area. These

Dimensioning of the second part wall or its part guide area offers the advantage that a cohesive connection can be carried out essentially without Maßkorrigierende preparations. Especially Preferably, the second mold part wall is dimensioned such that a gap is established which sucks in a liquefied filler material, in particular during soldering.

Preferably, a first housing molding and a second housing molding are at least partially connected in particular cohesively. This offers the advantage that the connection is capable of absorbing forces from the electrode assembly, in particular during different states of charge. In the connected state, the housing moldings form a housing of the secondary cell, in particular for the electrode assembly. According to a preferred development of the first or second preferred embodiment of a housing molding, this housing molding additionally serves:

• for holding at least one Stromableiters, and / or

• to keep a current collector in place substantially immovable in place with respect to the electrode assembly.

Preferably, this development of a housing molding has a

Ableiterausnehmung, which serves to receive a current collector. The current collector is guided through the Ableiterausnehmung and extends partially from the housing molding in the environment of the secondary cell. This development offers the advantage of a reduced number of electrical contact resistance.

Preferably, a current conductor is connected to this housing molding material cohesively, more preferably by means of a welded or soldered connection. This version has the advantage that the current collector of the

Housing molding is held substantially immovable. Another advantage is that there is good electrical contact between the current conductor and the housing molding. Preferably, a current conductor is non-positively connected to this housing molding, wherein a friction force particularly preferably holds the current conductor in position with respect to the housing molding. This embodiment has the advantage that the current conductor is held by the housing molding substantially immovable. Furthermore, this embodiment has the advantage that the current collector is insulated from the housing molding.

Preferably, the secondary cell has a

Electrode assembly clamping device, which:

• is provided, a normal force on the electrode assembly

to exercise, and

• is arranged in the housing.

The electrode assembly clamping device is at least temporarily inserted into a molding interior, preferably in the closing

Body molding. Preferably, the

Electrode assembly clamping device on a contact device, which is provided, at least temporarily, in particular flat on the

To touch electrode assembly. The abutment device is substantially plate-shaped or cup-shaped and rests at least temporarily on a lateral surface of the electrode assembly. Preferably, the electrode assembly clamping device has a

Normal force on which is provided to urge the contact device in the direction of the electrode assembly or to act on the contact device with a force in the direction of the electrode assembly, at least temporarily. The application of force to the installation device serves to ensure that

promote electrochemical interaction of the constituents of the electrode assembly. The normal force actuator is preferably configured to be transferred from a relaxed state to a tensioned state. These Embodiment offers the advantage that the normal force in the relaxed state allows easy insertion of the electrode assembly clamping device in a housing molding together with the electrode assembly. With transfer of the normal force actuator in the tensioned state, this urges the investment device in the direction of the electrode assembly or exercises a normal force on the investment device, which in particular the

Freedom of movement of the electrode assembly is limited. Preferably, the normal force actuator is formed with a spring, more preferably with an elastomer spring, plate spring, coil spring, leaf spring, gas spring. According to a preferred embodiment, the normal force actuator expands with overpass and the tensioned state and moves the

Investment device within the housing in the direction of

Electrode assembly. This refinement has the advantage that an electrode assembly which does not completely fill the first molding part interior is also pressed against the particularly first molding part wall and kept substantially immovable by frictional forces.

According to a further preferred embodiment, the normal force actuator is elastic at least in the tensioned state, particularly preferably with a spring. This embodiment offers the advantage that a

Dimensional change of the electrode assembly is compensated in particular as a result of changing state of charge of the electrode assembly by the normal force actuator by the electrode assembly is pressed unchanged against one, preferably the first part of the molding.

Preferably, a housing molding has at least one Ableiterausnehmung. In particular, the Ableiterausnehmung serves to receive a

Stromableiters, wherein the current collector is guided through the housing molding. Preferably, the current conductor is held positively and / or non-positively in the Ableiterausnehmung, more preferably with a sealing device or an insulating device. Preferably, the sealing device or the Insulating device formed with an electrically insulating material, particularly preferably of a polymer or elastomer. This embodiment has the advantage that the current conductor is electrically insulated and held substantially immovable relative to the housing molding. Preferably, the sealing device or the insulating device are multi-part and each with a recess for a substantially elongated region of a

Stromableiters formed. This embodiment has the advantage that an assembly of the sealing device or the insulating device is simplified.

Hereinafter, preferable embodiments of a

According to the invention described secondary cell.

Preferably, the secondary cell according to the invention is designed to deliver, at least temporarily, a current of at least 50A, 100A, 200A, 500A or more. This embodiment offers the advantage that the secondary cell is suitable for supplying an electric main drive motor of a motor vehicle, in particular during an acceleration drive or a drive uphill.

Preferably, the secondary cell according to the invention has a

Rated charging capacity of at least, 5 Ah, 10 Ah, 20 Ah, 50 Ah, 100 Ah or more. Particularly preferably, the secondary cell according to the invention has a nominal charging capacity of at least 20 Ah. This embodiment offers the advantage that the secondary cell is suitable in particular in the combination of a battery for supplying an electric main drive motor of a motor vehicle over a distance of at least 50 km.

Preferably, the secondary cell according to the invention for operation between -40 ° C and + 100 ° C is provided. This embodiment has the advantage that the secondary cell, in particular in combination with a battery for supplying a Consumer of a motor vehicle, for outdoor operation or a non-tempering room is suitable.

Preferably, the secondary cell according to the invention is mounted in a motor vehicle and designed to provide electrical energy for a consumer of the motor vehicle, preferably for an electric motor of the

Motor vehicle, particularly preferably for an electric motor which at least indirectly drives a wheel of the motor vehicle. This design offers the advantage that the lifetime of the secondary cell violates and / or

Vibrations from the operation of the motor vehicle is increased. A first preferred embodiment of the secondary cell has a

Electrode assembly, two current collector, a receiving housing molding and a closing housing molding on

The female housing part is essentially designed as a shell with a raised edge. The electrode assembly is in

Received molding interior and is held in particular by the molding wall in particular positive and / or non-positive. That's how it is

Electrode assembly held in the housing molding substantially immovable. Also, the female housing molding per Stromableiter a Stromableiterausnehmung. Two current conductors, in particular their electrode assembly contact regions, are electrically conductively connected to electrodes of different polarity of the electrode assembly, preferably connected in a materially bonded manner, particularly preferably welded by means of ultrasound. Lead contact areas of the current conductors partially extend from the receiving housing molding in the

Environment of the secondary cell. The particular as a threaded bolt

trained Zuleitungskontaktbereich a Stromableiters is through the

Guided Ableiterausnehmung and in particular by means of a Sealing device held in particular form-fitting and / or non-positively in the Ableiterausnehmung. This design offers the advantage that a current collector is held substantially immovable with respect to the housing molding and the electrode assembly. Preferably, a nut for connection of current conductors, arrester housing housing part and

Sealing device screwed onto the threaded bolt.

The closing housing molding, in particular its

Molding guide portion accommodates the female housing molding at least partially. Several wall elements each of the occlusive

Housing molding and the receiving housing molding are arranged parallel to each other, preferably, the wall elements contact each other surface. There, an overlap region is formed, which serves in particular to compensate for a deviation of an actual dimension of the electrode assembly from a desired dimension for the electrode assembly. In the overlapping area or adjacent are the female housing molding and the

closing housing molding together materially connected, preferably soldered or welded, more preferably with a peripheral seam.

The connected housing moldings exert a normal force on at least one lateral surface of the electrode assembly. A resulting frictional force keeps the electrode assembly substantially immovable with respect to

Current conductor. This embodiment has the advantage that mechanical loads on the electrically conductive connections of the electrode assembly and current conductors from relative movements during operation are counteracted, whereby an aging of the electrically conductive connections is encountered. Furthermore, this embodiment offers the advantage, due to the overlap region, that electrode assemblies of different dimensions can be surrounded by the same housing moldings. According to a preferred embodiment of the first embodiment, the connecting seam is formed as a circumferential, elastic Dickschichtklebung. The elastic thick film adhesive allows the housing to be stretched to compensate for a change in thickness of the electrode assembly due to a changed state of charge. Preferably, the thick-film adhesion is on

Shearing loaded. This embodiment offers the advantage that the frictional force between the electrode assembly and the housing moldings can be maintained during operation.

A second preferred embodiment of the secondary cell has a

Electrode assembly, two current collector, a receiving housing molding and a closing housing molding on.

Electrode assembly held in the housing molding substantially immovable. Also, the female housing molding per Stromableiter a Stromableiterausnehmung.

Two current conductors, in particular their electrode assembly contact regions, are electrically conductively connected to electrodes of different polarity of the electrode assembly, preferably connected in a materially bonded manner, particularly preferably welded by means of ultrasound. Lead contact areas of the current conductors partially extend from the receiving housing molding in the

Environment of the secondary cell. The particular as a threaded bolt

trained Zuleitungskontaktbereich a Stromableiters is through the

Guided Ableiterausnehmung and in particular by means of a

Sealing device held in particular form-fitting and / or non-positively in the Ableiterausnehmung. This design offers the advantage that a current collector is substantially immovable with respect to the housing molding and the electrode assembly is held. Preferably, a nut for connection of current conductors, arrester housing housing part and

Sealing device screwed onto the threaded bolt.

The closing housing molding, in particular its

Housing molding and the receiving housing molding are arranged parallel to each other, preferably, the wall elements contact each other surface. There, an overlap region is formed, which serves in particular to compensate for a deviation of an actual dimension of the electrode assembly from a desired dimension for the electrode assembly. In the overlap area are the female housing molding and the occlusive

Housing molding connected to one another cohesively, preferably soldered or welded, particularly preferably with a peripheral connecting seam. In the closing housing molding is a

Electrode assembly clamping device with contact device and

Normal force actuator used. The normal force actuator urges in the tensioned state, the investment device against a lateral surface of the

Electrode assembly. The normal force actuator is designed as a gas spring, wherein the gas pressure is increased with transition to the tensioned state, preferably by means of an accessible from outside the secondary cell inlet valve, which is particularly preferably arranged in an outer wall of the housing moldings. The normal force actuator is supported on the molding wall of the closing housing molding. This embodiment has the advantage that mechanical loads on the electrically conductive connections of the electrode assembly and current conductors from relative movements during operation are counteracted, whereby an aging of the electrically conductive connections is encountered. Another advantage of this embodiment is that a mechanical load of the electrically conductive connections of electrode assembly and current conductors of non - aligned positioning of electrode assembly and

Stromableitern due to inaccuracies in the manufacturing, especially when connecting female housing molding and closing housing molding, encountered.

According to a preferred development of the second embodiment, the gas spring is formed with a pressure relief valve and / or a bursting device, wherein pressure relief valve and / or bursting device are particularly preferably arranged in an outer wall of the housing moldings. Preferably, the electrochemical interaction of the electrodes of the electrode assembly with lowering of the normal force can be reduced. This configuration offers the advantage that the electrical current delivered by the electrode assembly can be reduced.

The Herste II method according to the invention for an inventive

Secondary cell is characterized by the provision of a first, in particular metallic housing molding, hereinafter referred to as step S1, wherein the housing molding a first molding part wall, a

Mold part interior and having at least a first mold part opening.

Subsequently, a prepared electrode assembly having at least two electrodes of different polarity and a separator through the first

Form part opening inserted into the first mold part interior of the first housing molding, hereinafter called step S2, whereupon preferably the

Electrode assembly is held by the first mold part wall positively and / or non-positively. Subsequently, a second in particular metallic housing molding is provided, hereinafter called step S3, wherein the second

Housing molding a second Formteilwandung, a second mold part opening and the second molding part wall has a molded part guide region, in particular adjacent to the second mold part opening.

Subsequently, the first housing mold part is at least partially inserted into the second housing mold part, in particular in its molded part guide area, referred to below as step S4, in particular through the second mold part opening, whereupon the mold part guide area at least partially surrounds the first mold part wall. The insertion takes place in particular in such a way that an overlap region is created by means of which a deviation of an actual dimension of the electrode assembly from a desired dimension of the electrode assembly is compensated. Thus, two coordinated

Housing moldings for electrode assemblies are used in particular with different thicknesses.

Preferably, at least one of the housing moldings is acted upon by a force in the direction of the other housing molding, hereinafter called step S5, in particular such that a normal force on the

Electrode assembly acts. This normal force is used in particular

Generating a frictional force in connection with the first part of the molding. The frictional force serves in particular to keep the electrode assembly substantially immovable with respect to at least one current conductor. These

Execution of the manufacturing process offers the advantage that an aging of the

Connection of current and arrester lugs is met. Preferably, step S5 ends after step S6. This development has the advantage that the normal force is applied until after the connection of the housing moldings is generated from the outside. Subsequently, at least partially, the first mold part wall is connected to the second mold part wall, hereinafter referred to as step S6, preferably cohesively, more preferably by means of at least one method from the following group, which welding, seam welding, resistance welding, medium frequency welding, Capacitor discharge welding, brazing, soldering, gluing and / or combinations of these methods. Particularly preferably, the connection is made with an elastic Dickschichtklebung, which can compensate for a dimensional change of the electrode assembly limited due to a change in state of charge.

This manufacturing process offers the advantages that

• an undesirable relative movement of current collector and

Electrode assembly is encountered in the operation of the secondary cell, in particular by the normal force in operation on a lateral surface of the electrode assembly,

• Damage to the electrode assembly is met with unyielding housing, in particular by the elastic Dickschichtklebung, and / or

• Use of housing moldings for electrode assemblies

various dimensions, in particular different thicknesses is made possible, in particular by the overlap region.

A preferred development of the manufacturing method according to the invention comprises step S1 1, according to which a current conductor is connected to at least one arrester lug, preferably to a plurality of collector lugs of the same polarity, particularly preferably by means of welding, roll seam welding, resistance welding, medium frequency welding,

Capacitor discharge welding, ultrasonic welding, brazing, soldering, gluing and / or combinations of these methods. This creates an electrical connection between the current conductor and the arrester lug.

This development offers the advantage that the electrical connection can be automated and generated with high repeatability. Preferably, step S1 1 is performed before step S2. This development offers the advantage of a simplified installation of the secondary cell, in particular a simplified implementation of step S4.

A preferred embodiment of the manufacturing method according to the invention comprises step S9, after which a current conductor is passed through a Ableiterausnehmung.

A preferred development of the manufacturing method according to the invention comprises step S10, according to which a current collector is connected to a housing molding, preferably to a female housing molding.

This is an undesirable relative movement of current collector and

Housing molding and an undesirable relative movement of

Current arrester and electrode assembly or current arrester encountered. This development offers the advantage that an aging of the electrical

Connection between current conductor and the arrester lug is prevented.

Preferably, step S10 is performed before step S6, more preferably before step S4. This development offers the advantage of simplified assembly.

A preferred embodiment of the method comprises step S7, after which an electrode assembly clamping device is inserted into the first housing molding, wherein the electrode assembly clamping device a

Investment device and a normal force actuator has. Preferably, the normal force actuator is relaxed. Preferably we the

Electrode assembly clamping device used simultaneously with the electrode assembly in a housing molding. In particular following step S6, step S8 follows, after which the normal force actuator is transferred into its tensioned state. This embodiment has the advantage that when easier

Installation on step S5 can be omitted. This embodiment offers the further advantage that at least one of the dimensions of the electrode assembly can be compensated for deviation from the desired dimension with the normal force actuator. This preferred embodiment can preferably be combined with the further developments, steps S9 to S11.

Further advantages, features and applications of the present invention will become apparent from the following description taken in conjunction with the figures. It shows:

1 schematically shows a section through an assembly for a

Secondary cell according to the first preferred embodiment of the invention

2 schematically shows a section through a secondary cell according to the first preferred embodiment using the assembly of FIG. 1,

3 schematically shows a section through an assembly for a

Secondary cell according to the second preferred embodiment of the present invention

Fig. 4 shows schematically a section through an assembly for a secondary cell according to the second preferred embodiment and this

Secondary cell.

1 shows schematically a section through an assembly for a

Secondary cell according to the invention according to the first preferred

Embodiment, with a first housing molding 4, a second

Housing molding 5, and a Elektrodenflachwickel second

The electrode flat winding 2 is surrounded by a polymer film, not shown, for electrical insulation with respect to the metallic housing moldings. Alternatively, the insides of the housing moldings could be coated electrically insulating.

The first housing molding 4 is thermoformed from a sheet metal to a shell with a rectangular base and with a raised edge. In the first housing molding 4 Ableiterausnehmungen 10, 10 a are punched. The electrode flat winding 2 is inserted through the first molded part opening 9 into the first molded part interior 8.

The second housing molding 5 is thermoformed from a metal sheet to a shell and with a raised edge. The second housing mold part 5 has a second mold part wall 7a, a second mold part interior 8a, a second mold part opening 9a and a mold part guide region 20. The molded part guide region 20 is part of the second mold part wall 7a and is arranged adjacent to the second mold part opening 9a.

The first housing molding 4 is partially inserted into the molding guide section 20 through the second molding opening 9a. This is the result

Overlap area 18 formed in which the raised edges of the housing moldings 4, 5 are arranged parallel to each other. Of the

Mold part guide portion 20 of the second mold part wall 7a surrounds parts of the first mold part wall 7. The second mold part wall 7a is in

Mold part guide portion 20 so dimensioned that with the first molding part wall 7, a welding gap or soldering gap is formed. The housing moldings 4, 5 are clamped by the force F around the electrode flat winding 2. In this

State is the assembly ready for step S6.

The electrode flat coil 2 has a separator of "separation." The electrode flat coil 2 also has a cathode with LiFePO ₄ . 2 schematically shows a section through a secondary cell according to the first preferred embodiment using the assembly of FIG. 1. The housing moldings 4, 5 or their molding walls 7, 7a are circumferentially welded together, which by the black filled triangles 31, 32nd is indicated. This is a housing 14vum the

Electrode flat winding 2 is formed.

The current conductor 3, shown schematically, has a threaded contact pin 1 1 formed as a contact area and an electrode contact area 12. On the threaded bolt 1 1, a busbar or a supply line can be pushed. The electrode contact region 12 serves the electrical

Connection with the electrodes of the electrode flat coil 2, in particular with the not shown tabs of the electrodes. The threaded bolt 1 1 of the Stromableiters 3 is guided by the Ableiterausnehmung 10. Of the

Threaded bolt 1 1 is sealed relative to the housing molding 4 by means of a sealing device, not shown, and electrically insulated. By means of the sealing device, which is fixed by a nut, also not shown on the threaded bolt 1 1, the threaded bolt 1 1 with a

Friction force held substantially immovable in a Ableiterausnehmung 10. 3 schematically shows a section through an assembly for a

Secondary cell of the invention according to the second preferred

Embodiment, with a first housing molding 4, a second

Housing molding 5, an electrode stack 2 and a

Electrode Assembly Clamping Device 15. The housing moldings 4, 5 essentially correspond to those of FIG. 1.

The electrode assembly clamping device 15 has a contact plate 16 and a spring 17. The contact plate 16 is located on a lateral surface of the Electrode stack 2 on. The spring 17 is provided to be supported on the second mold part wall 7a and to urge the contact plate 16 with a normal force against the electrode stack 2. That is possible if the

Housing moldings 4, 5 or whose Formteilwandungen 7, 7a are connected. Fig. 4 shows schematically a section through an assembly for a

Secondary cell according to the second preferred embodiment and this secondary cell.

Fig. 4a shows schematically an assembly for a secondary cell according to the second preferred embodiment. The module corresponds to

3, the electrode assembly clamping device 15 is formed with gas pressure springs 17a, 17b as a normal force actuator. The gas pressure springs 17a, 17b, which are intended to be supported on the contact plate 16 and the second part wall 7a, are relaxed. The housing moldings 4, 5 are not yet connected to each other. The assembly is shown after step S4.

Friction force held substantially immovable in a Ableiterausnehmung 10. 4b schematically shows a section through a secondary cell according to the second preferred embodiment using the assembly according to FIG. 3.

The housing moldings 4, 5 and their Formteilwandungen 7, 7a are

welded together, which is indicated by the black-filled triangles 31, 32. Thus, a housing 14 is formed around the electrode stack 2.

The gas springs 17a, 17a have already been transferred to their tensioned state. The gas springs 17a, 17a are supported on the contact plate 16 and the second molding part wall 7a. With the associated housing moldings 4, 5, the electrode assembly clamping device 15 exerts a normal force on the electrode stack 2. The normal force causes a frictional force which makes the electrode assembly substantially immovable with respect to the

Housing molding 4 and the current conductors 3 stops.

Claims

P a n t a n s p r e c h e

Electrochemical energy storage device (1), below

Called secondary cell, comprising at least:

An electrode assembly (2) with at least two electrodes

different polarity and a separator, wherein the separator is disposed between two electrodes, wherein the

Electrode assembly (2) is provided to provide at least temporarily electrical energy,

• a current conductor (3, 3a), which is provided with the

Electrode assembly (2), preferably to be electrically connected to one of the electrodes, preferably by means of a

cohesive connection,

A first, in particular metallic housing molding (4, 5),

which is provided for limiting the electrode assembly (2) with respect to the environment of the secondary cell (1),

A second, in particular metallic housing molding (4, 5),

which is provided for the particular positive and / or material connection with the first housing molding (4, 5), and for limiting the electrode assembly (2) relative to the environment of the secondary cell (1) is provided, wherein the current conductor (3, 3a) with a the housing molding (4, 5) is in particular positively and / or materially connected, wherein at least one of the housing molding parts (4, 5) is provided to receive the electrode assembly (2) in particular positive and / or non-positive. Secondary cell (1) according to one of the preceding claims, characterized in that at least one of the housing molding parts (4, 5) comprises:

A first shaped part wall (7, 7a) which surrounds a shaped part inner space (8, 8a), wherein the shaped part inner space (8, 8a) is provided to receive the electrode subassembly (2) in a form-locking and / or non-positive manner, and preferably the

To brace electrode assembly (2), wherein preferably the Formteiiinnenraum (8, 8a) has a substantially prismatic shape, and / or

A molded part opening (9, 9a) which serves as access to the

Formteiiinnenraum (8, 8a) is used.

Secondary cell (1) according to one of the preceding claims, characterized in that

The first housing molding (4) with a first molding part wall (7) is preferably cup-shaped or cup-shaped,

The second housing molding (5) is preferably cup-shaped or cup-shaped with a second molding wall (7a),

The second shaped part wall (7a) has a shaped part guide region (20), wherein the molded part guiding region (20) is provided to surround the first molded part wall (7) at least in regions, preferably in a form-locking and / or non-positive manner,

• the first mold part wall (7) and the second mold part wall (7a) are at least partially connected to each other in particular cohesively, in particular the first mold part wall (7) and the second mold part wall (7a) together a housing (14) for the

Form electrode assembly (2). Secondary cell (1) according to the preceding claim, characterized in that the housing (14) has an overlapping area (18) in which the first mold part wall (7) and the second mold part wall (7a) are arranged in parallel and adjacent to each other Overlap area (18) in particular serves to compensate for a deviation of an actual dimension of the electrode assembly from a desired dimension of the electrode assembly.

5. secondary cell (1) according to one of the preceding claims,

characterized by electrode assembly clamping means (15) arranged to apply a normal force to the electrode assembly (2) disposed in the housing (14)

preferably:

A contact device (16) which is provided, in particular flat against the electrode assembly (2), and

• a normal force actuator (17), which is provided, the

Facility (16) at least temporarily in the direction of the electrode assembly (2) to urge, the normal force actuator (17) is preferably provided to be transferred from a relaxed state to a tensioned state.

Secondary cell (1) according to one of the preceding claims, characterized

in that at least one of the housing molded parts (4, 5) has at least one arrester recess (10, 10a),

that the current conductor (3, 3a) extends through the Ableiterausnehmung (10, 10a), wherein preferably the current collector (3, 3a) relative to the housing molding (4, 5) is electrically insulated. Secondary cell (1) according to one of the preceding claims, characterized in that at least one of the housing molding parts (4, 5) by means of a forming process, a joining process and / or by means of a separation process of a substantially

plate-shaped starting material is produced.

Secondary cell (1) according to one of the preceding claims, characterized by

An electrode assembly (2) with lithium ions,

An electrode assembly (2) with at least one electrode,

preferably at least one cathode having a compound of the formula LiMP0 ₄ , where M is at least one

Transition metal cation of the first row of the Periodic Table of the Elements, wherein this transition metal cation is preferably selected from the group consisting of Mn, Fe, Ni and Ti or a combination of these elements, and wherein the compound preferably has an olivine structure, preferably parent olivine, and / or

At least one electrode, preferably at least one cathode, which comprises a lithium manganate, preferably spinel-type LiMn ₂ O ₄ , a lithium cobaltate, preferably LiCoO ₂ , or a lithium nickelate, preferably LiNiO ₂ , or a mixture of two or three of these oxides, or a lithium mixed oxide containing manganese, cobalt and nickel.

Secondary cell (1) according to one of the preceding claims, characterized by at least one separator which is not or only poorly electron-conducting, and which consists of an at least partially permeable carrier, wherein the carrier

preferably coated on at least one side with an inorganic material, wherein as at least partially permeable to material Support is preferably used an organic material, which is preferably designed as a non-woven fabric, wherein the organic material preferably comprises a polymer, and more preferably a polyethylene terephthalate (PET), wherein the organic material is coated with an inorganic, preferably ion-conducting material which further preferably in a temperature range of - 40 ° C to 200 ° C ion conducting, wherein the inorganic material preferably comprises at least one compound selected from the group of oxides, phosphates, sulfates, titanates, silicates, aluminosilicates at least one of the elements Zr, Al, Li, particularly preferably zirconium oxide, and wherein the inorganic, ion-conducting material preferably has particles with a largest diameter below 100 nm.

10. secondary cell (1) according to one of the preceding claims,

characterized in that

• the secondary cell (1) is provided, at least temporarily one

Deliver electricity of at least 50A,

The secondary cell (1) has a nominal charging capacity of at least 5Ah,

• the secondary cell (1) for operation between -40 ° C and + 100 ° C

is provided, and / or

• The secondary cell (1) is at least temporarily mounted in a motor vehicle and is provided for providing electrical energy for a consumer of the motor vehicle, preferably for an electric motor of the motor vehicle.

Battery (20) with at least two secondary cells (1, 1 a) according to one of the preceding claims, in particular provided for the provision of electrical energy for a consumer of a motor vehicle, in particular for installation in a motor vehicle. Method for producing a secondary cell (1), in particular according to one of the preceding claims, characterized by the steps:

(51) providing a first, in particular metallic

Housing molding (4), which a first Formteilwandung (7), a first molded part interior (8) and a first

Having molded part opening (9),

(52) inserting an electrode assembly (2), comprising at least two electrodes of different polarity and a separator, in the first housing molding (4) through the first mold part opening (9) in the first mold part interior (8), whereupon

Electrode assembly (2) of the first mold part wall (7) is surrounded in particular form-fitting and / or non-positively,

(53) providing a second, in particular metallic

Housing molding (5), which has a second Formteilwandung (7a) and a second mold part opening (9a), wherein the second Formteilwandung (7a) has a molding guide portion (20) in particular adjacent to the second mold part opening (9a),

(54) Inserting the first housing molding (4) in the second

Housing molding (5) at least partially in the

Molding part guide area (20), in particular through the second mold part opening (9a), whereupon the mold part guide area (20) surrounds the first mold part wall (7) at least in regions,

(55) preferably applying at least one of

Housing moldings (4, 5) with a force in the direction of the other housing molding (4, 5) in particular such that a

Normal force acts on the electrode assembly (2), (56) connecting the first mold part wall (7) to the second mold part wall (7a) at least in regions, preferably by material bonding.

13. Method according to the preceding claim, characterized by at least one of the steps:

(57) inserting an electrode assembly clamping device (15) into the first housing molding (4), the electrode assembly clamping device (15) having a contact device (16) and a normal force actuator (17),

(58) transferring the normal force actuator (17) from a relaxed state to a tensioned state,

(59) passing at least one current conductor (3, 3a) through an arrester recess (10, 10a) of one of the housing moldings (4, 5),

(510) connecting the current conductor (3, 3a) to the housing molding (4, 5),

(511) connecting a current collector (3, 3a) to at least one

Ableiterfahne the electrode assembly, preferably cohesively.