DE102018203052A1 - Battery and method of manufacturing a battery - Google Patents

Abstract

The present invention relates to a battery (100) with a prismatic housing (102) and a cell stack (104) with different-pole electrode layers (106) each having at least one contact lug (FIG. 10) over an active surface (108) of the electrode layer (106). 110) for electrically contacting the electrode layer (106), wherein the contact lugs (110) of the same pole electrode layers (106) are arranged aligned with each other and at least two gleichpoligen contact lobe bundles (112) are combined with a substantially equal number of gleichpoliger contact lugs (110) wherein the gleichpoligen electrode layers (106) via the corresponding gleichpoligen contact lugs bundle (112) and a pressure welding connection (114) with a corresponding arrester (116) of the housing (102) are electrically connected

Description

Field of the invention

The invention relates to a battery and a method for manufacturing a battery.

State of the art

A battery has terminals for transporting electrical energy or in an electrochemical energy storage, which are accessible on an outer side of a housing or a shell of the battery. The connections are connected inside the battery with electrodes of the energy storage. Gleichpolige electrodes are contacted together and electrically connected to the corresponding terminal.

Disclosure of the invention

Against this background, a battery and a method for manufacturing a battery according to the independent claims are presented with the approach presented here. Advantageous developments and improvements of the approach presented here emerge from the description and are described in the dependent claims.

Advantages of the invention

Embodiments of the present invention may advantageously enable a required length of tabs for electrically contacting electrodes of an energy storage of a battery to be shortened as compared to conventional implementations of batteries, thereby reducing electrical resistance of the tabs. An electric current flow through the contact lugs thereby leads to a reduced heating, in particular in the case of rapid discharge of the cell. In addition, a space requirement for contacting the energy storage is reduced, whereby the energy storage can be increased in proportion to a total volume of the battery. In normal operation, the Joule heating does not occur as much due to the lower currents flowing then. There is no need for an alternative, extremely low-impedance current path to an internal short circuit.

A battery is presented which has a prismatic housing and a cell stack with electrode layers of different polarity, each of which has at least one contact lug projecting over an active area of the electrode layer for electrically contacting the electrode layer, wherein the contact lugs of the same pole electrode layers are arranged aligned with one another and at least one each two gleichpoligen contact lobe bundles are combined with a substantially equal number of gleichpoliger contact lugs, wherein the gleichpoligen electrode layers are electrically connected via the corresponding gleichpoligen contact lug bundles and a pressure welding connection with a corresponding arrester of the housing.

Furthermore, a method for manufacturing a battery is presented, wherein the method comprises the following steps:

Stacking a cell stack comprising different polar electrode layers, whereby contact lugs of uniform-pole electrode layers protruding beyond an active area of the cell stack are arranged aligned with one another;

Bundling the same-pole contact lugs to at least two respective contact lug bundles, wherein a substantially equal number of contact lugs is bundled per contact lug bundle; and

Pressure welding of the homopolar contact lugs bundle to each one arrester of a housing of the battery to connect the gleichpoligen electrode layers via the corresponding contact lugs electrically conductive to the corresponding arrester.

A battery can be understood as an accumulator or a secondary battery for storing and re-supplying electrical energy. The electrical energy can be stored electrochemically in a cell stack of stacked single cells. The cell stack can be called a stack. The electrical energy can be conducted via electrically conductive electrode layers into the cell stack or out of the cell stack. A single cell is formed in each case between two different pole electrode layers of the cell stack.

The electrode layers of a single cell are therefore assigned to different electrical poles of the battery. The different pole electrode layers may have different electrically conductive materials. For example, the different-pole electrode layers may comprise copper foil or aluminum foil. A single cell can be called an elementary stack. In an elementary stack there are always double coatings. An electrode layer is therefore coated on both sides with the same material. This results in a sequence of an anode layer, copper Cu, another anode layer, a separator, a cathode layer, aluminum Al and another cathode layer. The layer structure of the individual electrodes consists of a Carrier film on which the electrochemically active layer is applied. In the case of the anode, the carrier foil is made, for example, of copper Cu or another electrochemically stable electron conductor at the anode potential. In the case of the cathode, the carrier foil is made, for example, of aluminum Al or another electrochemically stable electron conductor at the cathode potential. The electrochemically active layer is a porous layer of memory material and an electronically conductive additive. The layer is porous to receive lithium ions as a conductive liquid electrolyte. Alternatively, a solid state cell without porosity and separator can be constructed. The solid state cell may contain a lithium ion conductive solid electrolyte and both lithium ion conductive additives and electronically conductive additives in both electrodes together with the memory materials.

To form the single cells, the different electrode layers on active surfaces carry different electrochemically active materials for storing the electrical energy. The electrode layers are electrically isolated from each other. In the cell stack, the electrode layers are arranged parallel to each other with uniform intervals. For contacting, the electrode layers have electrically conductive contact lugs without electrochemically active materials. The contact lugs overflow over the active surfaces. The contact lugs are integrally formed with the electrode layers, for example of a common metal foil. Differently polar contact lugs do not touch each other. Gleichpolige contact lugs are summarized to at least two contact lobe bundles. Two gleichpolige contact lug bundles form a double bundle. One polarity can also be equipped with a single bundle of all the same pole contact lugs and the other polarity can be equipped with a double bundle. The cell stack has at least four contact lug bundles. A bundle of contact lugs can be combined to form a welding surface for establishing an electrically conductive connection of the contact lugs with one another, to the other same-pole contact lug bundle and to the arrester.

Due to the safety concept of the quick-charging device, the current path is extremely low-impedance. The battery cells can have one or two terminals. In the version with a terminal, the cell housing carries the other polarity. In the case of the two-terminal version, the housing can be neutral, at a floating potential or floating potential or at one polarity.

A housing may be a solid shell to protect the cell stack. In contrast to so-called pouch battery cells, in which the cell stack is surrounded by a flexible film, the housing is substantially dimensionally stable, i. the enclosed by the housing volume changes at most insignificant in normal operation of the battery cell, for example, less than 10% or less than 5% or 2%. A prismatic housing may for example have a rectangular base. An arrester may be an electrically conductive part of the housing, at which the electrical energy can be tapped on an outside of the battery. The two arresters of the battery are electrically isolated from each other. The approach presented here can also be used in a pouch cell.

Press welding can be, for example, ultrasonic welding or friction welding. In pressure welding, at least two materials are heated by pressure and friction until they are at least pasty and mixed together in pasty state. An energy necessary for welding the materials is thus provided predominantly in the form of mechanical energy during pressure welding. In particular, the ultrasonic welding allows, inter alia, an advantageous process control and / or advantageous welding results. For example, the materials to be welded are gently heated and not too high temperatures. In addition, several contact lugs can be welded together and / or with the arrester of the housing in a common process step. The film connection can also be made by other methods, such as gluing, laser welding, crimping, soldering or compression. Everything that creates a mechanically stable connection with homogeneously low resistance between the foils and the arrester can be used.

The cell stack may have at least two partial stacks stacked on top of one another. Each partial stack can have at least two different-pole contact lug bundles. During production, the two partial stacks can be stacked first and the tabs bundled. The prefabricated partial stacks can be joined together to form the cell stack. The contact lugs bundles can be made easier.

At a dividing plane of the partial stacks, ie where an electrode layer lying too far opposite one of the partial stacks of an electrode layer lying too far opposite the other of the partial stack, two different pole electrode layers can form a single cell of the cell stack. In other words, the two opposite to each other on the separation plane, to extremely lying electrode position of the two partial stacks may have different polarities, so that they form a single cell of the battery. Alternatively, two gleichpolige electrode layers adjacent to the parting plane be arranged. The parting plane may represent the middle of the cell stack if the part stacks have the same number of electrode layers. An additional single cell can increase the energy density of the battery. By two separate and optionally mutually isolated partial stack, an electrical interconnection of the cell stack can be set according to requirements. For example, the partial stacks can be connected in series.

Corresponding Gleichpolige electrode layers of the two sub-stacks can be integrally connected via their contact lugs. One of the partial stacks can be folded onto the other partial stacks, so that the electrode layers of the two partial stacks are arranged parallel to the dividing plane and the partial stacks face each other. The partial stacks can be stacked at the same time. Each pair of contact lug bundles may have a common welding surface. Material can be saved at the welding area, as half of the layers to be welded are eliminated.

The housing may have a cover assembly with a cover plate and an electrically insulated from the cover plate terminal bushing. The cover plate can form the one arrester of the battery. The terminal bushing can form the other end of the battery. The terminal bushing is electrically insulated from the cover plate. The terminal bushing can be arranged in a recess of the cover plate. The cell stack can first be connected to the lid assembly. Subsequently, the cell stack can be inserted into a remainder of the housing or enclosed by the remainder of the housing.

The terminal bushing may have two different, roll-clad materials. A heterogeneous low-resistance compound of the materials is challenging. To keep the electrical resistance low, an alloying zone is kept very thin. Friction welding methods, for example, are also suitable for this purpose. Different materials can fulfill different tasks. For example, one of the materials for pressure welding of the contact lug bundles may be particularly well suited. Likewise, at least one of the materials may be required to prevent corrosion and / or electrocorrosion. The materials may be metal materials. For example, copper or a copper alloy and aluminum or an aluminum alloy may be roll-bonded together.

Welding surfaces of the pressure weld connections on the cover plate and on the terminal leadthrough can be aligned transversely to a plane of the electrode layers and be arranged substantially equal in height. Alternatively, the welding surfaces may have a height offset from one another. Then the welded to the terminal bushing tabs can be shorter than the welded to the cover plate tabs. The welding surfaces may be part of the contact lug bundles. By aligning transversely to the electrode layers space can be saved. For the same height arrangement of the welding surfaces, the terminal bushing can be embedded in a large area in the cover plate. For the arrangement with height offset, the terminal bushing on the inside over the cover plate can survive. The terminal bushing may have a patch on the inside of the cover plate contact plate.

It should be understood that some of the possible features and advantages of the invention are described herein with reference to different embodiments as a battery and as a method of manufacturing a battery.

list of figures

• Die 1a bis 1d zeigen eine Darstellung eines Herstellungsablaufs einer Batterie gemäß einem Ausführungsbeispiel;
• 2 zeigt eine Schnittdarstellung durch eine Pressschweißverbindung an einer Batterie gemäß einem Ausführungsbeispiel;
• 3 zeigt eine Darstellung eines Pressschweißverfahrens an einer Batterie gemäß einem Ausführungsbeispiel;
• Die 4a bis 4f zeigen eine Darstellung eines Herstellungsablaufs einer Batterie gemäß einem Ausführungsbeispiel; und
• Die 5a bis 5d zeigen eine Darstellung eines Herstellungsablaufs einer Batterie gemäß einem Ausführungsbeispiel.

Embodiments of the invention will now be described with reference to the accompanying drawings, in which neither the drawings nor the description are to be construed as limiting the invention.

• The 1a to 1d show an illustration of a manufacturing process of a battery according to an embodiment;
• 2 shows a sectional view through a pressure-welded connection to a battery according to an embodiment;
• 3 shows a representation of a pressure welding method on a battery according to an embodiment;
• The 4a to 4f show an illustration of a manufacturing process of a battery according to an embodiment; and
• The 5a to 5d show an illustration of a manufacturing process of a battery according to an embodiment.

The figures are only schematic and not to scale. Like reference numerals designate the same or equivalent features in the figures.

An internal short circuit of a battery cell, such as by penetration of a nail, by a conductive particle or by overstressing the cell at e.g. An accident leads to internal heat generation, which can lead to thermal runaway of the battery cell and to a risk of explosion.

A fast discharge device transfers the heat to an outside of a cell stack of the battery cell and creates a permanent bypass to the defective battery cell. The fast discharge device thus reduces the heat input in the stack. As a result, a vehicle, in particular an electric vehicle, does not remain in the event of damage to a battery cell. The fast discharge device also avoids explosions and flames, which can endanger the occupants, third parties and / or the environment. A possible stoppage can be additionally prevented if the electrochemically deactivated by the quick discharge device without continuity cell further short-circuited maintains the series connection of the cells or is excluded by a secondary device with parallel connection of cells from the circle, eg by an additional Melzsicheru ng.

The integration of the rapid discharge device alters the cell design with respect to a contacting of the cell stack, since an electrical resistance is very critical. Likewise, the integration of the quick-charging device alters a volume-related energy density of the battery cell and a cooling of the battery cell.

The cell stack connection by tabs of the electrodes ensures electrical current flow from and to the electrode current collecting foils to and from the terminals of the battery cell during normal cyclic operation and rapid discharge.

Normally, the tabs are projections of the copper or aluminum current collecting foils of the anode and cathode layers, respectively, of defined but variable length. The tabs are bundled and welded to the terminal.

Since the tabs are thin films and are limited in width by dimensions of the battery cell, they have a small cross-sectional area. Therefore, a free length of the contact lugs should be as low as possible, for example 5 mm. The free length indicates the length between the active (coated) area and the welding point to the terminal.

Long contact lugs lead to a high electrical resistance, which increases linearly with the length. This resistance has a major influence on a total electrical resistance of the current path.

Long contact lugs lead to a reduced utilization of a cell volume, since the space used for the cell connection does not contribute to an electrochemically active area of the battery cell and thus lowers a volume-related energy density of the battery cell.

Embodiments of the invention

In the approach presented here, two contact lobe bundles are therefore used to contact the anode and cathode layers, respectively. As a result, the free length of the contact lugs can be reduced by approximately 50 percent. For example, an average free length of 10 mm can be reduced to 5 mm. Thus, the electrical resistance of the contact lugs can also be reduced by approximately 50 percent. For example, a resistance of less than 100 μΩ can be achieved. Furthermore, the volume required to contact the cell stack can also be reduced by approximately 50 percent.

The 1a to 1d show an illustration of a manufacturing process of a battery 100 according to an embodiment. A battery is produced 100 with a prismatic housing 102 that a cell stack 104 from different pole electrode layers 106 and required for operation between the electrode layers 106 encloses arranged separator layers. The electrode layers 106 So are the two electrical poles of the battery 100 assigned. The electrode layers 106 of the one pole are oxidized and act during discharge of the battery 100 as anodes. These electrode layers 106 may be referred to as anode layers. The electrode layers 106 the other pole are reduced and act as cathodes during discharge. These electrode layers 106 may be referred to as cathode layers. The anode layers and cathode layers alternate in the cell stack 104 from. On an active surface 108 the anode layers have anode material. The cathode layers point to their active surface 108 Cathode material on. The electrode layers 106 are electrically conductive. For example, the electrode layers 106 Metal foils with active material deposited thereon.

Every electrode layer 106 has at least one over the active area 108 protruding contact flag 110 for electrically contacting the electrode layer 106 on. The contact flags 110 different pole electrode layers 106 are at different positions of the cell stack 104 arranged. The active area 108 is rectangular here. The individual electrode layers 106 are stacked so that edges of the active area 108 are substantially congruent. The contact flags 110 Gleichpoliger electrode layers 106 are arranged aligned with each other. The contact flags 110 different pole electrode layers 106 to overlap with something Not. Here are the contact flags 110 along one side of the cell stack 104 arranged side by side.

The contact flags 110 Gleichpoliger electrode layers 106 are each at least two gleichpoligen contact lobe bundles 112 summarized. Each contact banner bundle 112 has substantially the same number of gleichpoligen tabs 110 on. Here, each contact flags bundle 112 each half of the same-pole contact lugs 110 on. The same-pole electrode layers 106 are via the corresponding Gleichpoligen contact lane bundles 112 and a press-welded connection 114 with a corresponding arrester 116 of the housing 102 electrically connected.

Here is the case 102 only one cover assembly 118 shown. The cover assembly 118 puts both arresters 116 the battery 100 ready. This is the first arrester 116 a terminal implementation 120 electrically insulated in a cover plate 122 the lid assembly 118 admitted. The terminal implementation 120 thus puts one electrically from the rest of the case 102 insulated electrically conductive connection through the cover plate 122 ready.

The rest of the case 102 , in particular the cover plate 122 is also electrically conductive, is at the other potential and acts as a second arrester 116 the battery 100 ,

In 1a is a first partial stack 124 of the cell stack 104 with the lid assembly 118 shown. The partial stack 124 here covers half of the electrode layers 106 of the cell stack 104 , The contact flags 110 of the sub-stack 124 are to two different pole contact lane bundles 112 summarized. The contact banner bundles 112 are side by side along one side of the sub-stack 124 arranged. The contact flags 110 the one in the partial stack 124 external electrode layers 106 are to the middle of the sub-stack 124 Angled down. The closer an electrode layer 106 is located at the center, the less is the associated contact lug 110 angled. At a short distance from the edge of the active surfaces 108 the contact flags touch each other 110 of the respective contact lane bundle 112 and form from there a welding surface 126 for the pressure welding connection 114 out. The distance is as small as possible. The distance is determined by the geometry, necessary strain reliefs or a film stability and requirements with regard to coating edge load. The distance determines the critical length for the resistance path. In the area of welding surfaces 126 lie the contact flags 110 flat on each other. Likewise, there may be a line connection. The welding surfaces 126 are opposite to a plane of the electrode layers 106 angled. The partial stack 124 and the lid assembly 118 are aligned with each other so that the welding surfaces 126 each above one of the arresters 116 are arranged. Here is the partial stack 124 obliquely to the lid assembly 118 aligned to a space above the welding surfaces 126 kept clear. The welding surfaces 126 are parallel to surfaces of the arresters 116 aligned. For other welding processes this may not be necessary.

In 1b is in addition to the illustration in 1a a second partial stack 128 of the cell stack 104 shown. The second part stack 128 essentially corresponds to the first partial stack 124 , Also the second part stack 128 is oriented so that its welding surfaces 126 at the arresters 116 are aligned. The welding surfaces 126 the two partial stacks 124 . 128 are arranged one above the other. The second part stack 128 is in the opposite direction as the first part stack 124 obliquely to the lid assembly 118 aligned. So the room stays above the welding surfaces 126 still free. In other words, the second sub-stack 128 relative to a plane perpendicular to the cover plate 122 symmetric to the first sub-stack 124 aligned. This results in a minimum height offset according to the film bundle thickness of the first sub-stack 124 ,

In 1c become the welding surfaces 126 with the underlying arresters 116 connected by a pressure welding process. Here is a sonotrode 130 for an ultrasonic welding process in free space between the sub-stacks 124 . 128 arranged. The sonotrode 130 is at the welding surfaces 126 aligned and presses the welding surfaces 126 as well as the respective arrester 116 against an anvil, not shown. This ultrasonic vibrations for ultrasonic welding in the welding surfaces 126 coupled to the gleichpoligen contact flags 110 the two gleichpoligen contact flags bundle 112 both partial stacks 124 . 128 with the respective arrester 116 electrically conductive and mechanically connect. Here is the sonotrode 130 on the welding surfaces 126 above the terminal lead-through 120 shown. The with the cover plate 122 to be joined other welding surfaces 126 are either simultaneously using a different sonotrode or time-shifted using the same sonotrode 130 welded.

In 1d are the part stacks 124 . 128 collapsed and form the continuous cell stack 104 out. The folded cell stack 104 comes with the lid assembly 118 inserted into an unillustrated residual housing to the housing 102 to complete. The cover assembly 118 is fluidly connected to the residual housing to the cell stack 104 and for the function of the battery 100 include required electrolyte, since many battery storage materials, conductive salts, and the like. Additive hygroscopic or emit environmentally harmful and / or harmful gases, especially in the formation and overcharging of the cells.

In one embodiment, the two sub-stacks 124 . 128 symmetrical to a perpendicular to the cover plate 122 standing dividing plane 132 built up. This is in the parting line 132 two identically polar electrode layers 106 together. At least one of the partial stacks 124 . 128 may also have an insulating sheath, in which case at least one layer of insulating material in the parting plane 132 is arranged.

In an alternative embodiment, the two sub-stacks 124 . 128 asymmetric to the parting plane 132 built up. In this case, different electrode layers are in the parting plane 106 arranged adjacent to each other and form an electrochemical single cell. Between the different pole electrode layers 106 a separator layer is arranged. The single cell is characterized by different pole contact lugs 110 on different sides of the dividing plane 132 contacted. The entire cell stack 104 can by an additional shell of the housing 102 be isolated. In this embodiment, the structure of two double bundles does not lead to an energy density loss, but has exactly the same energy density, as a stack built up from the outset individually with even number of layers.

In other words shows 1 a battery 100 comprising two stacks of electrodes, said stacks comprising anodes and cathodes. From the anodes are flags of a first type. From the cathodes are flags of a second type. Said flags of the first type of the first stack are welded to said flags of the first type of the second stack using a welding technique such as laser welding or ultrasonic welding.

An additional anode layer or cathode layer is present when the stacks are constructed identically, the additional layer not being equal to the capacity of the battery 100 contributes. An optional release layer can be placed between the stacks if they are identical.

No said separating layer between the stacks is present if said stacks are not identical.

The flags of the first type are shorter than the flags of the second type. An optional fast discharge path is disposed between said flags of the first type and said flags of the second type and forms a low electrical resistance electrical path. Here are the flags of different lengths, as a step between the terminal implementation 120 and the inside of the lid 118 to be bridged.

The double bundling allows a homogeneous current distribution in the stack by approximately the same length flags. The unequal stack construction makes it possible to dispense with one layer, which leads to a higher energy density. The distance between the nominal length of the shortest flag to the longest flag is about halved, since the flag length is about halved.

The two part stacks 124 . 128 are connected together in open condition to make room for the sonotrode 130 to accomplish. After connecting and welding the contact lugs 110 become the partial stacks 124 . 128 to the cell stack 104 together. Both partial stacks 124 . 128 can be isolated separately. The partial stacks 124 . 128 can after mating against the case 102 be isolated. The ultrasonic welding can be replaced by another welding process.

2 shows a sectional view through a pressure welding connection 114 on a battery 100 according to an embodiment. The battery 100 corresponds essentially to the battery in 1 , The terminal implementation 120 is here in a breakthrough of the cover plate 122 glued. A circumferential glue joint 200 isolated the two arresters 116 electrically from each other and seals a gap between the terminal lead-through 120 and the cover plate 122 from.

The terminal implementation 120 is made of roll-clad material. In this case, two difficultly connectable metals have been compressed under high pressure until a connection between the metals at the lattice level has arisen. This is done from an electrochemical point of view, since a material which is stable at anode potential in the cell is required on the anode side. In the case of liquid electrolyte contact, ie contact with liquid electrolyte, this is, for example, copper or nickel. Aluminum is preferred on the outside of the cell because it is less expensive and more corrosion resistant. Here is the terminal lead-through 120 copper on one side and aluminum on one side. The contact flags 110 the one with the terminal lead-through 120 by the pressure welding connection 114 welded uniform-pole electrode layers 106 are also made of copper. The terminal implementation 120 is so long and wide that the welding surfaces 126 lie all over the surface and circumferentially spaced from the glue joint 200 persists.

On the inside are a contact surface of the cover plate 122 and a contact surface of the terminal duct 120 here in one plane. As a result, the different pole contact lug bundles 112 of equal length.

3 shows a representation of a pressure welding process on a battery 100 according to an embodiment. The battery 100 corresponds essentially to the battery in 1 , Here, in contrast to the in 1 production process shown, the two part stacks 124 . 128 even before the pressure welding process to the cell stack 104 together. Alternatively, no partial stacks are created at all and the additional process of partial stack assembly can be saved. Between the gleichpoligen contact lane bundles 112 This results in one of the transverse to the cell stack aligned welding surfaces 126 and the innermost contact flags 110 the two contact flags bundle 112 limited, laterally open cavity 300 with a substantially triangular cross-sectional area. Here is one for welding to the cavity 300 adapted sonotrode 130 introduced into the cavity. The sonotrode 130 has a finger shape and a smaller cross-sectional area than the cavity 300 on.

The connection of the contact flags 110 can complete the cell stack 104 using a special sonotrode 130 or alternative welding technology.

The 4a to 4f show an illustration of a manufacturing process of a battery 100 according to an embodiment. The battery 100 corresponds essentially to the battery in 1 , In contrast, the lid assembly is 118 here with a welded terminal bushing 120 executed. The terminal implementation 120 has a contact plate on the inside 400 for welding the contact lug bundles 112 one pole of the battery 100 on. The contact plate 400 provides the contact surface required for welding. To derive the flow of electrical current from the battery 100 only one is required compared to the contact area lesser line cross-section. Therefore, the breakthrough is through the cover plate 122 smaller than the contact plate 400 , In the breakthrough is just a pen 402 arranged with a required for mechanical strength and current carrying capacity cross-sectional area. The cross-sectional area can be arbitrarily shaped.

On the outside is the pin 402 through a counterpart 404 held. The counterpart 404 is with the pen 402 welded under pretension. Between the inside of the cover plate 122 and the contact plate 400 as well as the outside of the cover plate 122 and the counterpart 404 are electrically insulating insulators 406 arranged from a plastic material. In addition, the breakthrough is not shown here by sealing rings between the contact plate 400 and the cover plate 122 and / or between the cover plate 122 and the counterpart 404 sealed.

By on the inside of the battery 100 over an area of the cover plate 122 protruding contact plate 400 and the inner insulator 406 there is a height offset to the cover plate 122 , As a result, they are with the contact plate 400 welded contact flags 110 shorter here than with the cover plate 122 welded contact flags 110 ,

In one embodiment, the pen is 402 connected by a friction welding process of two metal materials. As in 2 indicates the terminal lead-through 120 so on the inside of a different material than on the outside.

In 4a are the part stacks 124 . 128 on a welding device 408 arranged. The welding device 408 points for each partial stack 124 . 128 a requirement. The partial stacks are located on the supports 124 . 128 like the pages of an open book. The support ramps position the part stacks 124 . 128 so that the welding surfaces 126 the contact banner bundle 112 overlap. Between the support slant is the space for the sonotrode 130 free.

The pencil 402 the terminal implementation 120 is in 4a in a recess of an anvil 410 arranged. The contact plate 400 lies on a pressure surface of the anvil 410 on. The welding surfaces 126 of one pole of the cell stack 104 are between the sonotrode 130 and the terminal implementation 120 arranged and are through from the sonotrode 130 coupled ultrasonic waves and pressure with the contact plate 400 welded.

In other words, in 4a the anode double bundle with the terminal lead-through 120 connected. The terminal implementation 120 may comprise roll-plated material. Alternatively, copper and aluminum can be welded together by friction welding. The contact lugs of the anodes become on the copper surface of the contact plate 400 on the inside of the lid assembly 118 welded. The cylindrical part comprises the roll-plated material. The aluminum part will later be welded to the aluminum terminal plate.

In 4b are the welding surfaces 126 of the one pole welded to the contact plate. The anvil 410 is removed and the inner insulator 406 and an inner seal, not shown, between the terminal lead-through 120 and the cover plate 122 been arranged. The pencil 402 is in the breakthrough of the cover plate 122 arranged and stands on the outside over the cover plate 122 about.

In other words, in 4b an inner seal and the terminal lead-through 120 in the cover plate 122 used. The insulation is provided, for example, by cast or injection-molded plastic parts. The terminal implementation 120 is arranged in the recess of the plastic part, that the cylindrical part on the outside of the cover plate 122 survives. The flat part sits in the recess.

In 4c Is a flat anvil 410 on the cover plate 122 arranged. The welding surfaces 126 the other pole of the cell stack 104 are between the sonotrode 130 and the cover plate 122 arranged and are through from the sonotrode 130 coupled ultrasonic waves and pressure with the cover plate 122 welded.

In other words, in 4c the cathode double bundle with the cover plate 122 connected. The anode contact lugs are with the copper surface of the terminal lead-through 120 welded. The cathode contact lugs are with the cover plate 122 made of aluminum. Because of the step between the copper surface and the aluminum surface of the cover plate 122 the cathode contact lugs are longer than the anode contact lugs.

In 4d are all contact banner bundles 112 welded. The flat anvil 410 is removed and the outer insulator 406 and an outer seal, not shown, between the cover plate 122 and the counterpart 404 arranged. The protruding part of the pen 402 is in the counterpart 404 introduced.

In other words, in 4d an outer seal and the terminal plate mounted. The seal is placed in a recess around the opening through the cover plate 122 inserted. The seal seals the cover plate 122 , the terminal implementation 120 and the cell interior against the outside environment. The terminal plate is inserted into the recess of the plastic part on the outside, so that electrical contact can be established between the cells.

In 4e will be at the pin 402 pulled or against the contact plate 400 welded welding surfaces 126 pressed while on the counterpart 404 is pressed. This will make the insulators 106 and the seals compressed or compacted and so the breakthrough of the cover plate 122 sealed. In the compressed state becomes the counterpart 404 with the pen 402 welded to fix the bias.

In other words, in 4e the terminal plate is biased and the terminal lead-through 120 welded into the terminal plate.

In 4f is the welding device 408 removed and the part stacks 124 . 128 are folded to the one-piece cell stack 104 train. Subsequently, the cell stack 104 in the case of the battery 100 introduced.

In other words, in 4f the cell stack 104 put together and the battery 100 final assembly.

In one embodiment, each two Gleichpolige electrode layers hang different sub-stacks 124 . 128 over two contact flags 110 together and have a common welding surface 126 on.

The 5a to 5d show an illustration of a manufacturing process of a battery 100 according to an embodiment. The battery 100 essentially corresponds to the batteries in the 1 to 4 , In contrast, here are the welding surfaces 126 essentially parallel to the electrode layers 106 of the cell stack 104 aligned. This will be done in 5a one electrically conductive intermediate piece each 500 between the bundled welding surfaces 126 the two gleichpoligen contact flags bundles 112 the two partial stacks 124 . 128 arranged and welded with these. The intermediate pieces 500 turn into the 5b and 5c relative to the two arresters 116 arranged. In 5b becomes the intermediate piece 500 flat on even contact surfaces of the arrester 116 placed. In 5c become the intermediate pieces 500 in corresponding recesses 502 the arrester 116 used. The spacers can 500 as feedthroughs through the lid assembly 118 Act. In 5d become the intermediate pieces 500 electrically conductive with the arresters 116 connected. For example, the spacers 500 and the arresters 116 laser welded.

In other words, the dual-band connection can also be made using an additional conductor which is part of the terminal or connected to the terminal before or after the double bundle is connected. As a result, the double bundles can be essentially parallel to a stacking direction of the cell stack 104 be welded. This, however, consumes more space in the battery cell for electrical connection. However, welding can be done from outside the lid.

Finally, it should be noted that terms such as "consist ... of", "having", "comprising", etc., do not exclude other elements or steps, and terms such as "a" or "an" do not exclude a multitude. Reference signs in the claims are not to be considered as limiting.

Claims (10)

Battery (100) having a prismatic housing (102) and a cell stack (104) with different-pole electrode layers (106) each having at least one over a active surface (108) of the electrode layer (106) protruding contact lug (110) for electrically contacting the electrode layer (106), wherein the contact lugs (110) of the same pole electrode layers (106) are arranged aligned with each other and at least two gleichpoligen contact lobe bundles (112) are combined with a substantially equal number of gleichpoliger contact lugs (110), wherein the gleichpoligen electrode layers (106 ) are electrically conductively connected via the corresponding common-pole contact lug bundles (112) and a pressure-welded connection (114) to a corresponding arrester (116) of the housing (102). Battery (100) according to Claim 1 in which the cell stack (104) has at least two sub-stacks (124, 128) stacked on one another in a planar manner, each sub-stack (124, 128) having at least two different-polarity of the contact lug bundles (112). Battery (100) according to Claim 2 in which two different-polar electrode layers (106) form a single cell of the cell stack (106) at a parting plane (132) of the part stack (124, 128). Battery (100) according to Claim 2 in which two unipolar electrode layers (106) are arranged adjacent to one parting plane (132) of the part stacks (124, 128). Battery (100) according to one of Claims 2 to 4 in which corresponding, unipolar electrode layers (106) of the two partial stacks (124, 128) are integrally connected via their contact lugs (110), one of the partial stacks (124, 128) being folded onto the other partial stack (124, 128). Battery (100) according to one of the preceding claims, in which the housing (102) has a cover assembly (118) with a cover plate (122) and a terminal lead-through (120) electrically insulated from the cover plate (122), the cover plate (122) one terminal (116) of the battery (100) is formed and the terminal lead-through (120) the other arrester (116) of the battery (100) is formed. Battery (100) according to Claim 6 in that the terminal lead-through (120) has two different materials rolled-together with one another. Battery (100) according to one of Claims 6 to 7 in that welding surfaces (126) of the press-welded joints (114) on the cover plate (122) and on the terminal lead-through (120) are aligned transversely to a plane of the electrode layers (106) and are arranged substantially level. Battery (100) according to one of Claims 6 to 7 in which welding surfaces (126) of the pressure-welded connections (114) on the cover plate (122) and on the terminal leadthrough (120) are aligned transversely to a plane of the electrode layers (106) and have a height offset relative to one another, with the terminal lead-through (120) welded contact lugs (110) are shorter than the welded to the cover plate (122) contact lugs (110). A method of manufacturing a battery (100), the method comprising the steps of: Stacking a cell stack (104) comprising different polar electrode layers (106), whereby contact lugs (110) of unipolar electrode layers (106) projecting over an active surface (108) of the cell stack (104) are aligned with one another; Bundling the same-pole contact lugs (110) to at least two respective contact lug bundles (112), wherein a substantially equal number of contact lugs (110) is bundled per contact lug bundle (112); and Welding the gleichpoligen contact lugs bundle (112) to each one arrester (116) of a housing (102) of the battery (100) to the Gleichpoligen electrode layers (106) via the corresponding tab bundles (112) electrically conductively connected to the corresponding arrester (116) ,

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