WO2014048620A1 - Electric energy storage module and method for producing an electric energy storage module - Google Patents

Description

 Description title

 Electrical energy storage module and method for manufacturing an electrical energy storage module

The invention relates to an electrical energy storage module and a method for producing an electrical energy storage module.

State of the art

Usually, electrical energy storage cells are taken from direct current or direct current fed into them. Therefore, the previously known construction of

 Energy storage cells designed to optimize the ohmic internal resistance and the specific energy and power density of the energy storage cells.

In many applications of electrical energy storage cells, memory cells are connected in series or in parallel with each other to battery modules to set desired output parameters such as total voltage, voltage range, energy content or power density. If currents with increasing alternating component are removed from such energy storage cells, the influence of the distributed inductance of the energy storage cells increases as a function of frequency. The inductive losses of a

Energy storage cells are composed of the individual portions of the loss contributions of the electrodes, the Polverschaltung and the arrangement of the electrodes in the housing. In addition, at operating frequencies in the kHz range by the

Skine effect losses in the current-carrying areas and eddy currents in electrically conductive surfaces, for example in the housing occur.

The document DE 10 2010 035 1 14 A1 discloses, for example, a battery unit with a multiplicity of cell units, each of which has accumulator cells which are electrically coupled via busbars. Moreover, it is necessary to provide degassing openings in the battery cells, through which aerosols can escape from the battery cells. Usually, the battery cells are also heated via a cooling plate. The publication DE 40 19 462 A1 discloses, for example, a lead-acid battery in block construction, in which degassing channels are provided in the block cover, which lead out of the battery cells via vent openings exiting aerosols.

There is a need for energy storage modules of one or more

Energy storage cells, which have lower losses with regard to the removal of alternating currents of high frequency and thus the efficiency of the

Improve energy storage cell system in use, and where also the cell heating and the cell degassing can be optimized.

Disclosure of the invention

The present invention provides, in one aspect, an electrical

Energy storage module, with at least one memory cell stack, which a plurality of groups of first, planar parallel energy storage cells, each having first electrode elements, and a plurality of surface parallel to the groups of first energy storage cells arranged groups second, planar parallel

Energy storage cell having, each having second electrode elements. In this case, the groups of first and second energy storage cells are arranged alternately along a first extension direction of the storage cell stack, and the first electrode elements have a different polarity to the second electrode elements on the side surface of the storage cell stack on a first side surface of the storage cell stack. The energy storage module further comprises a plurality of planar contact elements, which are arranged on the side surfaces of the storage cell stack, which electrically connect adjacent groups of first and second energy storage cells, and which are substantially all first or second

Contact electrode elements of the adjacent groups of first and second energy storage cells each across the width of the memory cell stack away. The

Energy storage cells have in each case on a along the extension direction arranged second side surface of the storage cell stack on each vent openings. The energy storage module further comprises a degassing channel which is formed over the degassing openings of the energy storage cells along the second side surface flat parallel to the memory cell stack, and which is adapted to discharge aerosols, which emerge from the energy storage cells via the vent openings away from the storage cell stack. According to a further aspect, the present invention provides a method for producing an electrical energy storage module, comprising the steps of

alternatingly arranging a plurality of groups first, surface parallel

Energy storage cells, each having first electrode elements, and a plurality of surface parallel to the groups of first energy storage cells arranged groups of second, flat-parallel energy storage cells, each second

Have electrode elements, in at least one memory cell stack along a first direction of extension of the memory cell stack, wherein the first

Electrode elements on a side surface of the memory cell stack have a different polarity to the second electrode elements on the side surface of the

 Have memory cell stack, and contacting substantially all first or second electrode elements of the adjacent groups first and second

Energy storage cells each across the width of the memory cell stack away using a plurality of flat contact elements, which on the side surfaces of the

Memory cell stack are arranged, and which adjacent groups of first and second energy storage cells galvanically connect. The energy storage cells in this case have at a arranged along the direction of extension second side surface of the

Storage cell stack each vent openings on. In a further step, the method comprises arranging a degassing duct over the degassing openings of the energy storage cells along the second side surface in a plane parallel to the latter

 Storage cell stack, wherein the degassing channel is adapted to aerosols, which emerge from the energy storage cells via the degassing of the

Leading away storage cell stacks. Advantages of the invention

It is an idea of the present invention, the losses caused by the eddy currents occurring in the control of an electrical energy storage module inside the energy storage module and / or in the housing to reduce using a suitable internal structure of the energy storage module with the lowest possible internal cell inductance and simultaneously to ensure optimal degassing and cooling. These are the energy storage cells of the electric

Energy storage module suitably arranged such that on the one hand, the total length of the necessary current-carrying conductor elements and on the other hand, the number of contact junctions between the individual interconnected

Energy storage cells and housing parts is minimized. On a side surface of an energy storage cell stack is in a degassing, which along this Side surface runs, collected from the energy storage cells escaping gas and discharged to the outside.

A significant advantage is that the energy loss can be significantly reduced, especially in the removal of high frequency alternating current from the energy storage module. In particular, in battery systems with integrated inverter, so-called battery direct inverter ("BDI"), in which a rapid change of power management by a battery module for varying the

Voltage is applied, this reduction in energy loss is a great advantage.

Another advantage is that the short-term dynamics of such

Energy storage modules is improved by the delay of the energy or

Load output of the energy storage cells is minimized after load changes. As a result, it is advantageously possible to dispense with otherwise possibly compensating components, such as, for example, buffer capacitors, which can reduce the space requirement and the production costs of components which insert energy storage cells or modules.

Moreover, by avoiding inductive loss shares through the

Energy storage cells, the electromagnetic compatibility (EMC) can be improved because the emitted electromagnetic fields can be reduced and interference on adjacent electronic components can be reduced. Furthermore, ohmic losses, for example, due to the skin effect, largely reduced, which is advantageously associated with increased efficiency and lower heat generation.

At the same time, the advantage of optimal gas removal via a flat

Gas collector channel. This reduces the height of the entire system.

Advantageously, the degassing channel does not interfere with the formation of the pole connections, so that no consideration has to be made between low modulus inductance on the one side and optimum degassing on the other side.

Through the entire structure, optimal cooling is also possible when providing a cooling plate on the free side surface of the storage cell stack.

According to one embodiment, the energy storage module according to the invention may further comprise a first planar pole terminal, which first electrode elements one a first end surface of the memory cell stack arranged group first

Energy storage cells electrically contacted, and a second planar Polanschluss, which second electrode elements one at a second end face of the

Memory cell stack arranged group of second energy storage cells electrically contacted, wherein the first planar pole terminal and the second planar pole terminal are guided parallel to each other along a side surface of the memory cell stack.

Alternatively, the energy storage module according to the invention can have two memory cell stacks adjoining one another on the side surfaces, each with groups of first energy cells which are flat in area and groups of second energy storage cells which are flat in area.

In this case, the energy storage module according to the invention may further electrically contact a first planar pole connection, which electrically contacts first electrode elements of a group of first energy storage cells arranged on an end surface of a first storage cell stack, and a second planar pole connection, which electrically contacts first electrode elements of a group of first energy storage cells arranged on an end surface of a second storage cell stack , wherein the first planar

Pol connection and the second planar pole terminal are arranged parallel to each other between the two memory cell stacks.

According to a further embodiment, the inventive

Energy storage module further comprising an insulating layer, which is arranged between the first planar pole terminal and the second planar pole terminal for electrically insulating the pole terminals.

According to a further embodiment of the energy storage module according to the invention, the insulating layer may be embodied as a dielectric layer with a high dielectric constant, which has a low-inductive, capacitive path between the dielectric layers

 Pole connections forms. This allows a further reduction of the module inductance of the energy storage module.

According to a further embodiment of the energy storage module according to the invention, the energy storage module may further comprise a cooling plate, which is arranged flat parallel along a third side surface of the storage cell stack opposite the second side surface and which is designed to operate during operation of the Dissipate energy storage cells resulting waste heat from the energy storage module. Through this cooling plate and a dehumidification of the metallic conductor of the energy storage module is very possible. In an advantageous embodiment, the cooling plate via at least one

Protrude end surface of the storage cell stack. On the over the end face of the

Memory cell stack protruding portion may then be arranged power electronic components. As a result, the cooling plate can take on a dual function and at the same time also switching elements and driver circuits for the

Take over energy storage module, for example, in Batteriedirektumrichterschaltungen for electric drive systems.

According to a further embodiment, the inventive

Energy storage module further comprising a housing, which groups the first, flat parallel energy storage cells, the groups second, planar parallel

 Energy storage cells and the plurality of contact elements includes. In this case, the housing may consist of a non or only slightly electrically conductive material. According to a further embodiment of the energy storage module according to the invention, the degassing channel can completely cover the second side surface of the storage cell stack. This allows for the same fluid cross section an extremely flat geometry of the degassing, whereby the overall height of the energy storage module can be minimized.

In an advantageous embodiment, the degassing channel may consist of a metallic material.

According to one embodiment of the method according to the invention, furthermore, the step of arranging a cooling plate in a planar manner can be parallel to one of the second

Side surface opposite third side surface of the storage cell stack done, wherein the cooling plate is designed to dissipate during operation of the energy storage cells waste heat from the energy storage module. Further features and advantages of embodiments of the invention will become apparent from the following description with reference to the accompanying drawings. Brief description of the drawings

1 shows a schematic representation of an arrangement of electrical

 Energy storage cells; Fig. 2 is a schematic representation of a basic structure of an electrical

 Energy storage module according to an embodiment of the invention;

Fig. 3 is a schematic representation of a basic structure of an electrical

 Energy storage module according to another embodiment of the invention; Fig. 4 is a schematic representation of a basic structure of an electrical

 Energy storage module according to another embodiment of the invention; 5 shows a schematic representation of an electrical energy storage module according to a further embodiment of the invention; and

6 shows a schematic representation of a method for producing an electrical energy storage module according to a further embodiment of the invention.

The directional terminology used herein, that is, terms such as "left," "right," "top," "bottom," "front," "rear," "above," "behind," and the like, will be understood only for convenience of the drawings, and shall in no case constitute a restriction on the general public. Like reference numerals generally designate like or equivalent components.

Electric energy storage cells in the sense of the present invention include all devices which store electrical energy over a predefined period of time and can deliver it again over a further period of time. Energy storage cells in the context of the present invention encompass all types of secondary and primary energy storage devices, in particular electrically capacitive, electrochemical (Faraday) and combined storage types. The considered periods can range from seconds to hours, days or years.

Electrical energy storage cells can be, for example, lithium-ion cells, lithium-polymer cells, nickel-metal hydride cells, ultracapacitors, supercapacitors, power capacitors, BatCaps, batteries based on lead, zinc, sodium, lithium, magnesium, sulfur or other metals, Elements or alloys, or include similar systems. The functionality of the electrical energy storage cells encompassed by the invention can be based on intercalation electrodes,

Reaction electrodes or alloy electrodes in combination with aqueous, aprotic or polymeric electrolytes are based.

The construction of electrical energy storage cells in the sense of the present invention can be both different outer structures, such as

prismatic shapes or so-called "pouch" shapes, as well as different electrode structures, such as wound, stacked, folded or other constructions include.

Electrode elements in the sense of the present invention can be made of various electrically conductive, for example metallic materials.

Electrode elements in the sense of the present invention can be coated,

filled in three dimensions and / or produced with a large active surface. Depending on the memory technology, the planar electrode elements may have different dimensions, for example, the thickness of electrode elements may have orders of magnitude of a few μm to a few mm. The electrode elements may be folded, stacked or wound, and it may be provided to form insulation or separation layers between the electrode elements which galvanically separate the electrode elements from one another and can separate the electrolyte into individual regions within the cell housing. It may also be possible to

To build up electrode elements in bipolar form. The flat shape of the

Electrode elements can be square, rectangular, round, elliptical or any other design.

Electric energy storage modules according to the present invention comprise components which have one or more electrical energy storage cells in a housing, wherein the electrical energy storage cells are suitably electrically coupled to one another in order to ensure a serial or parallel connection of the energy storage cells. Electrical energy storage modules can have module connections, to which one of the internal interconnection of the electrical energy storage cells of the electrical energy storage module dependent output voltage can be tapped.

Housing in the context of the present invention comprise all components which have a recess for receiving one or more electrical energy storage cells and the electrically conductive interconnection elements of the electrical energy storage cells, and which can mechanically and / or electrically shield the recorded energy storage cells and elements from the outside world. Housings may comprise electrically conductive materials, electrically non-conductive materials or only poorly conductive materials or combinations of partial areas of such materials, such as, for example, plastics, metals, alloys of metals. The shape and size of the housing can be adapted to the recorded energy storage cells and elements.

Fig. 1 shows a schematic representation of an arrangement of electrical

Energy storage cells 10. The arrangement 10 comprises a plurality of flat electrical energy storage cells 1 and 2, which along their

Surface normal direction side by side in a memory cell stack 7 are arranged. The memory cell stack 7 in this case has a first extension direction, which runs in FIG. 1 by way of example from left to right. The storage cell stack 7 can each have quadrangular end surfaces, which are connected via four side surfaces along the first extension direction. In the exemplary embodiment of FIG. 1, the memory cell stack 7 has rectangular end faces, but others

End surface shapes, such as a square or a trapezoidal shape are also possible.

The energy storage cells 1 and 2 have a plurality of electrode elements 1a and 2a, respectively. The electrode elements 1a and 2a, for example, spirally wound into each other electrodes, stacked electrodes or electrodes folded on one another. In this case, per energy storage cell 1 or 2 electrode elements of different polarity may be present, which are electrically isolated from each other within the energy storage cell 1 and 2 respectively. The electrode elements can be, for example, flat layers of electrically conductive material, which are meshed with one another in a comb-like structure. It may also be possible that the

Electrode elements by winding or folding a band of layered

Electrode elements have been brought into an alternating stack shape. It should be clear that there are a wealth of possibilities, the electrode elements 1 a and 2a in an energy storage cell 1 and 2, respectively, and that the selection of a

Arrangement of the memory technology used, the boundary conditions with respect to the outer shape of the energy storage cell 1 or 2 and / or the electrical characteristics to be achieved of the energy storage cell 1 or 2 may be dependent.

For example, it may be advantageous to arrange the electrode elements 1a or 2a such that the inner volume of the energy storage cells 1 or 2 is utilized to the maximum.

The energy storage cells 1 differ from the energy storage cells 2 to the effect that they are arranged in the memory cell stack 7 in mirror image with respect to their polarity. In other words, the energy storage cells 1 are such

arranged on the front side surface of the storage cell stack 7

Electrode elements 1 a positive polarity, and on the rear side surface of the

Memory cell stack 7 electrode elements 1 a negative polarity have. In contrast, the energy storage cells 2 are arranged so that they on the front

Side surface of the memory cell stack 7 electrode elements 2a negative polarity, and on the rear side surface of the memory cell stack 7 electrode elements 2a have positive polarity. The energy storage cells 1 and 2 can be electrically insulated from each other, for example, each by separating elements 3. The separating elements 3 are used in particular for the separation of the electrolyte into segments, so that a certain electrical potential difference within this segment in the electrolyte is not exceeded. These may, for example, have thin layers of electrically non-conductive or only slightly conductive materials. The number of each juxtaposed, oriented in the same direction Energiespeicherzellenl or 2 is shown in Fig. 1 by way of example with three, but any other number of juxtaposed energy storage cells the same orientation is also possible. The arrangement of cells in the same direction means electrically a parallel connection of the cells, which in particular allows the representation of higher currents. The interconnection of such a packet with one of cells in the opposite direction corresponds to a series connection with a corresponding addition of the individual voltages.

The energy storage cells 1 and 2 may have vent openings 9, which are arranged on a side surface of the storage cell stack 7. The

Degassing 9 all energy storage cells 1 and 2 are arranged on the same side surface, that is, that the first energy storage cells 1 are constructed with respect to the degassing 9 mirror images of the second energy storage cells 2. The storage cell stack 7 may be enclosed by a housing 4, which is exemplary prismatic in FIG. However, it is clear that any other shape for the housing 4 is also possible, and that this shape may be dependent on the dimensions of the enclosed energy storage cells 1 and 2, for example.

FIG. 2 shows a schematic representation of an electrical energy storage module 20, which has an arrangement of electrical energy storage cells 1 and 2. The arrangement of electrical energy storage cells can correspond, for example, to the arrangement 10 in FIG. 1. It should be understood, however, that any other arrangement with adaptation of each interconnected elements for the electrical

Energy storage module 20 is also possible.

The electrical energy storage module 20 has two-dimensional contact elements 5, which respectively contact adjacent groups of energy storage cells 1 and 2 laterally and interconnect. In this case, the flat contact elements 5 each connect electrode elements 1a and 2a of different polarity. The planar contact elements 5 may each have a surface extension direction which is perpendicular to the surface extension directions of the electrode elements 1 a and 2 a and the

Side surfaces of the energy storage cells 1 and 2 is. The flat contact elements 5 may comprise, for example, layers, flat strips or layer elements of electrically conductive material. In this case, the planar contact elements 5 essentially contact all the first or second electrode elements 1a or 2a of the adjacent groups of energy storage cells 1 and 2, respectively, along their respective ones

Surface extension direction across the width of the storage cell stack 7 away.

Preferably, the flat contact elements 5 contact a plurality of

Electrode elements 1 a and 2 a per energy storage cell 1 and 2, so that the electrical connection path between adjacent energy storage cells 1 and 2 is as low as possible. At the same time, the current density over the large areal extent of the respective contact elements 5 is distributed as homogeneously as possible.

The surface contacting of the contact elements 5 can be achieved for example via welding, spraying, sputtering or bonding process with the electrode elements 1 a and 2a. It may be provided to keep the projection of the contact elements 5 as low as possible over the vertical extent of the respective layers of electrode elements 1 a and 2a in addition to avoid unnecessary current paths. The contact elements 5 are arranged alternately at the front and rear of the storage cell stack 7, so that a meandering or serpentine current path between adjacent energy storage cells 1 and 2 along the

Longitudinal extent of the storage cell stack 7 results. The number of groups

adjacent, similarly arranged energy storage cells 1 and 2 is preferably even, so that each not connected via contact elements 5 end contacts of each end of the memory cell stack 7 located groups adjacent, similarly arranged energy storage cells 1 and 2 are on the same side of the storage cell stack 7. In the exemplary illustrated case in FIG. 2, these end contacts are located on the front side at the left and right ends of the memory cell stack. The end contacts can each be electrically contacted via pole terminals or pole contact terminals 6a and 6b.

The pole terminals or pole contact terminals 6a and 6b can each have planar elements, which surface parallel to one another to one end side of the

Memory cell stack 7 are performed. In the present example of FIG. 2, the pole contact terminals 6 a and 6 b are guided on the left side of the memory cell stack 7. The distance between the Polkontaktanschlüsse 6a and 6b to each other can be chosen as small as possible to the through the Polkontaktanschlüsse 6a and 6b

enclosed flooding area and thus the inductive impedance of the

Polkontaktanschlüsse 6a and 6b to be kept as low as possible.

It may optionally be provided, an insulating layer 8, which is indicated in sections in Fig. 2, between the Polkontaktanschlüsse 6a and 6b

to provide a galvanic isolation between the Polkontaktanschlüssen 6a and 6b. The insulation layer 8 can also extend between the front-side contact elements 5 and the pole contact connection 6a for a corresponding galvanic insulation. Furthermore, the insulating layer 8 may be implemented as a dielectric layer having a high dielectric constant, which forms a low-inductance, capacitive path between the pole contact terminals 6a and 6b. This path can run parallel to the actual electrical Verschaltungspfad the energy storage cells 1 and 2. Due to the capacitive parallel path, the module-internal inductance can be further reduced. The pole terminals or pole contact terminals 6a and 6b can extend, for example, over a surface as large as possible, flush with each other. Between the respective ends of the Polkontaktanschlüsse 6 a and 6 b can then a Output voltage of the energy storage module 20 are tapped. The

Energy storage module 20 in Fig. 2 may also have a housing 4, which is not shown explicitly for reasons of clarity in Fig. 2. FIG. 3 shows a schematic representation of an electrical energy storage module 30, which has an arrangement of electrical energy storage cells. The

Energy storage cells can correspond to the energy storage cells 1 and 2 in Fig. 1. The electrical energy storage module 30 has an arrangement of two storage cell stacks 7a and 7b arranged parallel to one another. Without restricting generality, the memory cell stack 7a shown in the background is to be referred to as the rear memory cell stack, and the memory cell stack 7b shown in the foreground is referred to as the front memory cell stack. The number of groups

adjacent, similarly arranged energy storage cells 1 and 2 in both

Memory cell stacks 7a and 7b may be the same and have an even number. The number of energy storage cells 1 and 2 per group is shown in Fig. 3 by way of example with one, wherein any other number is also possible. The electric

Energy storage module 30 has no separating elements between the energy storage cells 1 and 2; However, it is understood that as shown in Fig. 1 corresponding separating elements 3 between the groups of adjacent, similarly arranged energy storage cells 1 and 2 may be provided.

Similar to the energy storage module 20 shown in FIG. 2, adjacent energy storage cells 1 and 2 of each storage cell stack 7a and 7b, respectively, over

Contact elements 5 connected to each other, wherein the front-side contact elements 5 are arranged alternately to the rear-side contact elements 5, so that a meandering or serpentine current path between

adjacent energy storage cells 1 and 2 along the longitudinal extent of the

Memory cell stack 7a and 7b results. The last located on the right

Energy storage cells 2 of both storage cell stack 7 a and 7 b can via a

stack-overlapping contact element 5a may be electrically connected to result in a straddling current path meandering from the left side of the rear memory cell stack 7a to the right side of the rear memory cell stack 7a, and from the right side of the front memory cell stack 7b to the left side of the front memory cell stack 7b runs. It can to the respective

End contacts of the memory cell stack 7a and 7b, that is, at the rear of the leftmost energy storage cell 1 of the front memory cell stack 7b and at the front of the leftmost energy storage cell 1 of the Rear memory cell stack 7a each pole terminals or Polkontaktanschlüsse 6a and 6b may be provided.

The pole terminals or Polkontaktanschlüsse 6a and 6b can analog

Properties as described in connection with FIG. 2. In particular, an optional insulation layer 8 can be provided, which between the

Polkontaktanschlüsse 6a and 6b is introduced to ensure a galvanic isolation between the Polkontaktanschlüssen 6a and 6b. The insulating layer 8 may also be between the front side for a corresponding galvanic insulation

Contact elements 5 of the rear memory cell stack 7a and the rear side

Contact elements 5 of the front memory cell stack 7b extend.

In FIG. 3, for reasons of clarity, again no housing is shown, although the energy storage module 20 may have a housing 4 which can ensure a mechanical and / or electrical shielding of the energy storage module 20 with respect to the outside world.

The vent openings 9 of all energy storage cells 1 and 2 are in turn arranged on adjacently lying in a plane side surfaces of the storage cell stack 7a and 7b, so that over the vent openings 9 aerosols from all

 Energy storage cells 1 and 2 emerge in substantially the same direction and thereby can be derived via a suitable Entgasungssammelsystem.

Overall, FIGS. 2 and 3 show only exemplary embodiments of energy storage modules. Variations and modifications can under

 Be taken into account by purposeful design criteria.

In general, it is advantageous to keep the distances between current-carrying elements of both polarities as low as possible in order to minimize the active surface area enclosed by these elements. This means that the inductive impedance of the current-carrying elements inside the energy storage modules can be minimized. Moreover, it is advantageous to design the current-carrying elements as large as possible in order to distribute the current density as homogeneously as possible. Is an ideally planar, closely fitting to the active areas of the electrode elements

Polkontakting possible only under certain conditions, such as safety requirements or technical constraints, so it is at least to make sure to ensure the merger of the current-carrying elements of different polarity at a small distance from each other. Furthermore, it is advantageous to the number to minimize the necessary pole connections of the energy storage cells with the housing by means of suitable module-internal connection of the energy storage cells. As a result, the ohmic line resistances are reduced, which in turn results in both

DC operation as well as in AC operation in a minimization of ohmic losses, in particular due to the skin effect, results.

For example, the illustrated energy storage modules may be preferably used in systems where high frequency alternating currents are out of the

Energy storage cells are removed, for example, in battery direct converters with drive frequencies above about 100 Hz. In these systems, due to the design of the energy storage modules inductive losses due to the high

AC frequency can be minimized. At the same time, that improves

Responses of the energy storage modules in the short-term range, which significantly improves the dynamics and reliability of the systems.

The energy storage modules 20 and 30 of FIGS. 2 to 3 can serve as a basis for an energy storage module 40, as shown by way of example in FIG. 4. The

Energy storage module 40 includes an energy storage module 20, which is applied to a side surface 9b on a cooling plate 1 1. In this case, the cooling plate 1 1 is arranged in a planar manner along one of the side surfaces 9 a, on which the degassing openings 9 are arranged opposite side surface 9 b of the storage cell stack 7.

For example, the cooling plate may comprise a metallic layer of high thermal conductivity material which is designed to withstand the operation of the

To dissipate energy storage cells 1 and 2 resulting waste heat from the energy storage module 40.

The cooling plate 1 1 can protrude beyond at least one end face of the storage cell stack 7, as shown in Fig. 4, for example, with the section 1 1. On the over the end surface of the memory cell stack 7 protruding portion 1 1 a then, for example, power electronic components can be arranged. The

Power electronic components can, for example, semiconductor switches,

Power semiconductor switches, diodes or similar components, which are used for high-frequency Beschallten the energy storage module 40. As a result, the cooling plate 1 1 can also simultaneously de-heat the power-electronic components with the energy storage module 40, as a result of which the required installation space for the entire module together with the control electronics is reduced. In addition, the necessary conductor lengths between the pole terminals 6a and 6b of the Energy storage module and the power electronic components, resulting in a reduction of electrical losses.

FIG. 5 shows a schematic representation of an electrical energy storage module 50, which has an arrangement of electrical energy storage cells 1 and 2. The energy storage module 50 may be, for example, as shown in FIGS

Energy storage modules 20 to 40 are constructed. In this case, as shown in FIG. 2, pole terminals or pole contact terminals 6a and 6b are applied to a side surface of the memory cell stack 7. Via the degassing openings 9 on the side surface 9a of the storage cell stack 7, a degassing channel 12 is arranged, which is opened with respect to the degassing openings 9, and out of the degassing openings 9

Collects escaping aerosols and conducts them to the outside. The degassing passage 12 may completely cover, for example, the side surface 9a of the storage cell stack 7. Thus, with the same cross section of the degassing 12, the height of the

Degassing channel 12 and thus of the energy storage module 50 are minimized.

The degassing 12 may for example consist of a metallic material. Moreover, the degassing channel 12 for mechanical fixation of

Energy storage cells 1 and 2 are used in the cell assembly of the energy storage module 50.

6 shows a schematic representation of a method 60 for producing an electrical energy storage module, in particular one of the energy storage modules 20, 30, 40 or 50 shown schematically in FIGS. 2 to 5. In a first step 61, a plurality of groups is arranged alternately first, planar parallel energy storage cells 1, each having first electrode elements 1 a, and a plurality of surface parallel to the first groups

Energy storage cells 1 arranged groups second, planar parallel

Energy storage cells 2, each having second electrode elements 2a, in at least one memory cell stack 7, 7a, 7b along a first direction of extension of the memory cell stack 7, 7a, 7b, wherein the first electrode elements 1a on a side surface of the memory cell stack 7, 7a, 7b a different polarity to the second electrode elements 2a on the side surface of the storage cell stack 7, 7a, 7b. In a second step 62, substantially all of the first or second electrode elements 1a, 2a of the adjacent groups of first and second energy storage cells 1, 2 are contacted over the width of the storage cell stack 7, 7a, 7b by means of a plurality of planar contact elements 5 to the

Side surfaces of the memory cell stack 7, 7a, 7b are arranged, and which adjacent Groups of first and second energy storage cells 1, 2 galvanically connect. In this case, the flat contact elements 5, for example, by a welding method, a spraying method, a sputtering method or a bonding method with the

Electrode elements 1 a, 2 a are contacted. Preferably, the electrical resistance of the connection point between the respective contact element 5 and the electrode elements 1 a, 2 a is to be kept as low as possible.

The first and second planar parallel electrode elements 1 and 2 can be suitably stacked, folded or wound, for example, before contacting with the respective contact elements 5, depending on the desired cell topology. For example, for a so-called pouch cell, the first and second

Electrode elements 1 a and 2 a are folded or layered in meandering paths using an insulating separator layer. For the

For example, a prismatic cell design may use a "racetrack pancake" topology or a "racetrack double pancake" topology, that is, a flat spiral winding of first and second electrode elements 1a and 2a, respectively, along a cross-sectional direction of the resulting coil can be compressed or compressed to a "racetrack" shape, that is, one over close

External radii connected to receive substantially parallel winding paths.

In this case, the energy storage cells 1 and 2 have degassing openings 9 at a second side surface 9a of the storage cell stack arranged along the extension direction, so that in a third step 63 of the method 60, a degassing channel 12 is arranged above the degassing openings 9 of the energy storage cells 1 and 2 along the second Side surface 9a flat parallel to the memory cell stack is possible. The degassing 12 serves aerosols, which from the

Energy storage cells on the vent openings 9 emerge from the

Leading away storage cell stacks.

In an optional step 64, a cooling plate 11 can be arranged in a planar manner along a third side surface 9b of the storage cell stack opposite the second side surface 9a. The cooling plate 1 1 is used in the operation of

To dissipate energy storage cells 1 and 2 resulting waste heat from the energy storage module. Optionally, enclosing the memory cell stacks 7, 7a, 7b and the

Contact elements 5 take place in a housing 4. In this case, the first and second pole terminals 6a, 6b can be led out of the housing 4 as electrical terminals of the energy storage module.

Claims

Claims 1. Electric energy storage module (20; 30; 50), comprising: at least one memory cell stack (7; 7a; 7b), which comprises: a plurality of groups of first, flat parallel energy storage cells (1), each having first electrode elements (1 a), and a large number of groups of second energy storage cells (2), which are arranged in a planar manner parallel to the groups of first energy storage cells (1), and each have second electrode elements (2 a), wherein the groups of first and second energy storage cells (1; 2) are arranged alternately along a first extension direction of the storage cell stack (7; 7a; 7b), and wherein the first electrode elements (1a) are arranged on a first side surface of the Memory cell stack (7; 7a; 7b) a different polarity to the second  Having electrode elements (2a) on the first side surface of the storage cell stack (7; 7a; 7b); a plurality of flat contact elements (5), which on the side surfaces of the Memory cell stack (7; 7a; 7b) are arranged which galvanically connect adjacent groups of first and second energy storage cells (1; 2), and which substantially all first or second electrode elements (1 a; 2a) of the adjacent groups of first and second energy storage cells (1 2) each across the width of the memory cell stack (7; 7a, 7b) contact away, the energy storage cells (1; 2) having vent openings (9) on a second side surface (9a) of the storage cell stack (7; 7a; 7b) arranged along the extension direction; and a degassing duct (12) which above the degassing openings (9) of the Energy storage cells (1, 2) along the second side surface (9a) flat parallel to the memory cell stack (7; 7a, 7b) is formed, and which is adapted to aerosols, which from the energy storage cells (1, 2) via the degassing (9 ) escape from the storage cell stack (7; 7a; 7b). The electrical energy storage module (20; 50) of claim 1, further comprising: a first planar pole connection (6b), which first electrode elements (1a) of a first group arranged on a first end face of the storage cell stack (7) Energy storage cells (1) contacted electrically; and a second planar pole connection (6a) which electrically contacts second electrode elements (2a) of a group of second energy storage cells (2) arranged on a second end face of the memory cell stack (7), wherein the first planar pole terminal (6b) and the second planar pole terminal (6a) are guided parallel to each other along the first side surface of the storage cell stack (7). The electrical energy storage module (20; 30; 50) of claim 2, further comprising: an insulating layer (8) which is arranged between the first planar pole connection (6b) and the second planar pole connection (6a) for galvanically insulating the pole connections (6a; 6b). The electrical energy storage module (20; 30; 50) of claim 3, wherein the Insulation layer (8) is a high-dielectric-constant dielectric layer forming a low-inductance capacitive path between the pole terminals (6a, 6b). The electric energy storage module (30; 50) according to claim 1, which has two adjacent side surfaces opposite to the first side surface Memory cell stack (7a, 7b), each with groups first, two-dimensionally parallel  Energy storage cells (1) and groups of second, flat parallel energy storage cells (2). The electrical energy storage module (30; 50) of any one of claims 1 to 5, further comprising: a cooling plate (1 1) which is arranged in a planar manner along a third side surface (9b) of the storage cell stack (7; 7a; 7b) opposite the second side surface (9a) and which is designed to operate during operation of the energy storage cells (1; ) dissipate waste heat arising from the energy storage module (20; 30; 50). The electrical energy storage module (20; 30; 50) of claim 6, wherein the cooling plate (1 1) projects beyond at least one end face of the storage cell stack (7; 7a; 7b) and on top of the end face of the storage cell stack (7; 7a ; 7b) protruding portion (1 1 a) power electronic components are arranged. The electrical energy storage module (20; 30; 50) of any one of claims 1 to 7, further comprising: a housing (4), which encloses the groups of first energy cells (1), which are flat in area, the groups of second energy cells (2), which are flat in area, and the plurality of contact elements (5). 9. The electric energy storage module according to claim 1, wherein the degassing passage completely covers the second side surface of the storage cell stack. The electrical energy storage module (20; 30; 50) according to any one of claims 1 to 9, wherein the degassing passage (12) is made of a metallic material. 1 1. Method (60) for producing an electrical energy storage module (20; 30; 50), comprising the steps of: alternating arrangement (61) of a multiplicity of groups of first energy cells (1), each having a first electrode elements (1 a), and a plurality of groups of second energy storage cells (2), which are arranged flat parallel to the groups of first energy storage cells (1) 2), each having second electrode elements (2a), in at least one Memory cell stack (7; 7a; 7b) along a first extension direction of The first electrode elements (1 a) on a side surface of the storage cell stack (7; 7a; 7b) have a different polarity to the second electrode elements (2a) on the side surface of the storage cell stack (7; 7a; 7b ) exhibit;  Contacting (62) essentially all of the first or second electrode elements (1a, 2a) of the adjacent groups of first and second energy storage cells (1, 2) across the width of the storage cell stack (7; 7a; 7b) by means of a multiplicity of planar contact elements (5 ) which are arranged on the side surfaces of the storage cell stack (7; 7a; 7b) and which adjacent groups first and second Galvanically connecting the energy storage cells (1; 2) to vent openings (9) on a second side surface (9a) of the storage cell stack (7; 7a; 7b) arranged along the extension direction; and Arranging (63) a degassing duct (12) over the degassing openings (9) of the energy storage cells (1; 2) along the second side surface (9a) flat parallel to the storage cell stack (7; 7a; 7b), the degassing duct (12) being designed for this purpose is, aerosols, which emerge from the energy storage cells (1, 2) via the vent openings (9) of the memory cell stack (7, 7a, 7b) away. 12. The method (60) according to claim 1 1, further comprising the step:  Arranging (64) a cooling plate (11) flat in parallel along a third side surface (9b) of the storage cell stack (7; 7a; 7b) opposite the second side surface (9a), the cooling plate (11) being designed to operate during operation of the Dissipate energy accumulation cells (1; 2) resulting waste heat from the energy storage module (20; 30; 50).