DE102020133411A1 - Mounting device for a pouch battery cell, battery module and vehicle - Google Patents

Abstract

The present invention relates to a receiving device for a pouch battery cell, which has a sealing seam on the circumference and current collector lugs protruding from the sealing seam, the receiving device being designed in the shape of a frame and comprising:an outer frame; andan inner frame; wherein the inner frame is arranged in the outer frame in such a way that a sealing seam receiving cavity is formed between the outer frame and the inner frame, in which the sealing seam of the pouch battery cell can be arranged, in particular folded over.

Description

The invention relates to a receiving device for a pouch battery cell, a battery module and a vehicle.

Battery cells in vehicle drives change their volume during a charging or discharging process and/or as a result of aging over their service life. Furthermore, an operating characteristic of lithium-ion pouch battery cells depends heavily on the external conditions due to their low mechanical stability.

The pressure applied to the pouch battery cells from the outside is a decisive factor for the performance, service life and structural stability of a battery module that includes a large number of pouch battery cells.

A technical challenge when using solid-state batteries such as lithium-ion pouch battery cells is to allow the volume of the anode to change. During a charging process, lithium ions accumulate in a porous layer of the anode and migrate out again during a discharging process. This can result in a volume change of around 30 percent of the pouch battery cell between a charged and a discharged state.

In a battery module in which the individual pouch battery cells are present in the group, the pouch battery cells in the group have to be able to move up to several millimeters. This pathway is amplified whenever more than one cell is stacked together in a pouch shape or similar shape. This means that the further a battery cell is from a (rear) wall of a battery housing (in the direction of cell stacking), the greater its displacement path.

It should therefore be noted that the pouch battery cell can move freely in the direction of volume expansion and, if necessary, follow a pressure plate, while in all other directions a position and orientation of the pouch battery cell remains unchanged (i.e. no displacement, tilting, tilting , Etc.). Furthermore, pressure should be applied to the pouch battery cell, regardless of its movement, in order to reduce or even avoid dendrite formation and/or growth. Therefore, for the performance and longevity of the pouch battery cell, a pressure load that is even over the entire cell surface is necessary. This requires a deformation-relevant design of the components involved in the battery module.

In current pouch battery cells with liquid electrolyte, the volume expands as a result of aging effects. In order to compensate for this volume expansion caused by aging and to avoid significant deformation of the battery housing, passive pressure mats, tensioning straps and/or springs are used to absorb or compensate for the volume expansion. This ensures that the individual cell stacks cannot move (around) freely in the housing at any time. This can reduce the risk of damage to the cells or cell stacks. However, these systems can only compensate for comparatively small volume changes of less than 10 percent. Furthermore, these systems are not suitable for enabling movements of the pouch battery cells that are significantly greater than the cell thickness.

Furthermore, care must be taken to ensure that the sealing seam of the pouch battery cell is not damaged, e.g. by movement of the pouch battery cell, since otherwise there would be fluid communication between the interior of the pouch battery cell and its external environment. As a result, an electrolyte can diffuse out of the pouch battery cell or oxygen can get inside the pouch battery cell, both of which can lead to a reduction in service life.

From the DE 10 2010 051 010 A1 It is known that at least parts of a sealing seam of a single battery cell designed as a pouch cell can be provided with a frame which is connected to the sealing seam, a heat-conducting element attached in the area of a part of the sealing seam and/or other areas of the single battery cell by means of a positive connection, a non-positive connection Connection and / or an adhesive bond is connected. So it is a frame z. B. made of plastic, which is firmly connected to the single battery cell and / or the heat conducting element by gluing and heat-conducting potting and ensures sufficient heat conduction and rigidity of the cell during operation.

The object of the present invention is to provide an improved holding device for a pouch battery cell, an improved battery module and an improved vehicle.

This object is achieved by the recording device according to claim 1, the battery module according to claim 9 and the vehicle according to claim 10.

Further advantageous configurations of the invention result from the dependent claims and the following description of preferred embodiments of the present invention.

• einen Außenrahmen; und
• einen Innenrahmen;

wobei der Innenrahmen in dem Außenrahmen derart angeordnet ist, dass zwischen dem Außenrahmen und dem Innenrahmen eine Siegelnahtaufnahmekavität ausgebildet ist, in der die Siegelnaht der Pouch-Batteriezelle, insbesondere umgelegt, anordenbar ist.A first aspect of the present invention relates to a receiving device for a pouch battery cell, which has a sealing seam on the circumference and current collector lugs protruding from the sealing seam, the receiving device being designed in the shape of a frame and comprising:

• an outer frame; and
• an inner frame;

wherein the inner frame is arranged in the outer frame in such a way that a sealing seam receiving cavity is formed between the outer frame and the inner frame, in which the sealing seam of the pouch battery cell can be arranged, in particular folded over.

The pouch battery cell has a stack of layers comprising layers of electrode material and separator material in an outer shell (packaging film), z. B. from a composite film with optional aluminum insert enclosed. The sides of the outer shell are usually thermally welded, creating the seal seam that runs around and seals the stack of layers. The sealing seam is therefore present on the peripheral side of the pouch battery cell.

Furthermore, the pouch battery cell has two current collector lugs that are electrically conductively connected to the layer stack. Depending on the embodiment, the current collector lugs can be arranged on one side of the pouch battery cell or on opposite sides.

The frame-shaped receiving device is intended to enclose the pouch battery cell at its periphery. The frame shape of the receiving device essentially corresponds to the peripheral shape of the sealing seam of the pouch battery cell. Furthermore, the receiving device is designed in such a way that a change in volume of the pouch battery cell enclosed in the receiving device is made possible as a result of a charging process and a discharging process.

The change in volume takes place in a layer stack area of the pouch battery cell and in the layer stack direction, i. H. in a direction perpendicular to the layer stack.

The receiving device comprises the outer frame and the inner frame and is therefore designed in two parts. The receiving device can, for example, comprise a receiving section for receiving the inner frame. For this purpose, the receiving section can run circumferentially on the outer frame. “Peripheral” means an edge area of the outer frame. The accommodating portion can accommodate the inner frame such that the inner frame is placed in the outer frame. Here, the edge portion may include an outer peripheral side of the outer frame and a peripheral portion of the frame as viewed in the front direction of the outer frame. The frontal direction is perpendicular to the plane of the frame of the receiving device (hereinafter "plane of the frame"). If the pouch battery cell is enclosed in the receiving device, the frame plane is arranged parallel to the layers from the layer stack of the pouch battery cell and perpendicular to the stacking direction.

The inner frame and the outer frame can be connected to one another via a non-positive, positive and/or material connection. For example, latching lugs, gluing, riveting, screwing, etc. can optionally be provided for this purpose.

The inner frame is arranged in the outer frame in such a way that a sealing seam receiving cavity is formed between them. The sealing seam of the pouch battery cell can be arranged in the sealing seam receiving cavity. The sealing seam receiving cavity is arranged between a surface of the outer frame that faces the inner frame and a surface of the inner frame that faces the outer frame. The sealing seam receiving cavity can therefore essentially run along the receiving section. For example, the sealing seam receiving cavity can be arranged between an inner peripheral side of the outer frame and an outer peripheral side of the inner frame. The sealing seam receiving cavity runs circumferentially along the receiving device. The receiving device can thus enclose the pouch battery cell at the periphery of the pouch battery cell by arranging the sealed seam in the sealed seam receiving cavity.

The sealing seam can be arranged in a protected manner in the receiving device by means of the sealing receiving cavity, as a result of which damage to the sealing seam can be avoided. For example, this can prevent the sealing seam from rubbing against other components of a battery module (e.g. housing, other cells, etc.) due to movement of the pouch battery cell. Furthermore, conventionally manufactured pouch battery cells with a sealed seam can be installed in the battery module by means of the receiving device. Furthermore, it can also be avoided that the sealing seam is damaged by material connections, such as e.g. B. gluing, and / or screwing, riveting, etc. is attached to the receiving device. Therefore, the sealing seam (and thus also the pouch battery cell) in the Auf be taken device, in particular non-destructive, releasably bordered.

Furthermore, an area of the sealing seam is also received in the sealing seam receiving cavity, from which the current collector lugs are led out of the pouch battery cell or out of the outer film. This can prevent the outer film from rubbing on the inside of a battery module housing. It is thus possible to prevent the outer film from being abraded in the area of the current collector lugs, as a result of which, in the worst case, an undesired electrically conductive contact can occur between the current collector lugs and an aluminum material used in the outer film. This results in unfavorable insulation conditions on the outer film, which promote electrical breakdown. The receiving device can therefore permanently ensure the good insulating properties of the outer film and improve the dielectric strength of the pouch battery cell, since the outer film does not rub against the battery module housing when the pouch battery cells are moved.

Furthermore, for example, the sealing seam can be arranged folded over in the sealing seam receiving cavity. In this context, “folded over” means that the sealed seam in the sealed seam receiving cavity is placed/guided over a radius that is provided in the sealed seam receiving cavity (seen in the circumferential direction of the receiving device) on the outer frame and/or the inner frame. For this purpose, the sealing seam receiving cavity or a cross section of the sealing seam receiving cavity, viewed in the circumferential direction of the receiving device, comprises a first cavity section and a second cavity section. The first cavity section runs parallel to the plane of the frame and along a neutral line of the pouch battery cell. In other words, when the pouch battery cell is enclosed in the receiving device, the sealing seam is arranged in the first cavity section without a kink or folding over. The "neutral fiber" is a level of the pouch battery cell in which the current collector lugs are located. The second cavity section is adjacent to the first cavity section and forms an angle with the first cavity section, viewed in the circumferential direction of the receiving device. In some examples, the angle can be between 80° and 100° degrees, for example essentially 90° degrees. The angle or bending radius in the seal receiving cavity depends on the material used for the outer film and its deformability. Since the sealing seam can be arranged folded over in the sealing seam receiving cavity, the receiving device can be designed to be comparatively short in the transverse direction. The transverse direction lies in the plane of the frame and describes a direction from a center of the receiving device to the periphery. This configuration of the sealing seam receiving cavity allows the receiving device to be designed to save space and weight. A battery module that includes a large number of holding devices with enclosed pouch battery cells can thus be designed to save space and weight. Alternatively, the volumetric efficiency of the battery module can be increased with the same battery module size, since more receptacles (with bordered pouch battery cells) can be installed in the battery module (housing) due to the space-saving design of the receptacles.

In further embodiments, the outer frame and the inner frame can be designed in such a way that the sealing seam can be clamped at least partially between the outer frame and the inner frame. By "clampable" is meant that the outer frame and the inner frame can exert a force fit on the seal seam, which at least partially prevents movement of the seal seam. For example, the first cavity section can be designed in such a way that the frictional connection is exerted on the sealing seam. As a result, attachment of the pouch battery cell to the receiving device can be improved.

As a rule, the pouch battery cell is designed in the shape of a rectangle, as is the receiving device accordingly. In contrast to some embodiments, in which the sealing seam receiving cavity runs completely along the circumference of the receiving device, there are embodiments in which the sealing seam receiving cavity can be cut out or exposed to accommodate creases in the corner areas of the sealing seam, which arise when the sealing seam is folded over. This means that the sealing seam receiving cavity in the corner areas of the receiving device is at least a partially open cavity. The corner areas of the receiving devices can be at least partially recessed or cut free, so that the corner areas of the pouch battery cell and the folded sealing seam with their folds can be accommodated in the receiving device and/or can be received at least partially protected. The corner areas are the areas at the corners of the rectangular recording device, as seen in the frontal direction of the recording device. As a result, creases can be formed on the sealing seam side by folding over the sealing seam in the corner regions of the receiving device, and stress on the sealing seam in its corner regions can be at least partially reduced.

In some embodiments, the receiving device can also have a snap-in connection for detachably connecting the outer frame to the inner frame. The detachable connection can, for example, as a non-positive connection such. B. a screw connection, and / or as a positive connection, z. B. a locking / snap / clip connection can be formed. In particular, the outer frame can include a locking lug for locking the inner frame into place on the outer frame. For this purpose, the detent can be designed to be elastically deformable. The detent can run at least partially or completely along the outer frame or receiving section. Due to the detachable connection between the outer frame and the inner frame, the pouch battery cell enclosed in the receiving device can be exchanged particularly easily and without destroying the receiving device.

In alternative embodiments, the outer frame and the inner frame can be connected to one another via a snap-in connection for quick assembly and locking as described above. In addition, the outer frame and the inner frame can be connected to one another via an additional non-positive, material and/or positive connection in order to enable a particularly stable connection between the outer frame and the inner frame. For example, the additional connection can include an adhesive, a welded and/or a screwed connection.

In other embodiments, at least one of the outer frame and the inner frame may have an inner peripheral chamfer facing outward. “Inner peripheral side” means a side or surface of the outer frame or the inner frame that runs along the inner circumference of the outer frame or the inner frame. The inner peripheral chamfer faces outward, i. H. the inner peripheral side chamfer is provided on an outer edge located on an inner peripheral side of the outer frame and the inner frame, respectively. Furthermore, the inner peripheral side chamfer (in the peripheral direction) can run along the entire periphery of the outer frame or the inner frame. With the inner peripheral chamfer, when the pouch battery cell discharges and thus contracts in the stacking direction, tilting of the outer shell of the pouch battery cell with an outer edge of the outer frame or the inner frame can be at least partially avoided.

In some embodiments, the receiving device can also have a chamfer on the outer peripheral side. In other words, the outer peripheral side chamfer is provided on an outer edge located on an outer peripheral side of the retainer. The outer peripheral chamfer can thus be provided on the outer frame. Furthermore, the outer peripheral side chamfer (in the peripheral direction) can run along the entire periphery of the receiving device. With the outer peripheral chamfer, when the pouch battery cell is being charged or discharged and thus expands or contracts in the stacking direction, tilting of the receiving device on the battery module housing or on its components can be at least partially avoided and rubbing of the receiving device on the battery module housing can be reduced.

In other embodiments, the receiving device may further include outer peripheral sliding portions so that the receiving device can be placed in sliding contact with an inner wall of a battery module housing. “Outer peripheral side” means a side or surface of the outer frame or inner frame that runs along the outer perimeter of the outer frame or inner frame. The slide portions may be arranged on either outside of the frame-shaped retainers.

The sliding sections can, for example, have a surface structure with favorable sliding properties, be coated with lubricants and/or include a lubricant reservoir. With the sliding sections, a stick-slip effect (ie stick-slip effect of bodies moving against one another) of the receiving device in the battery module housing can be at least partially reduced. Furthermore, an optimization of the sliding/friction surfaces between the receiving device and the battery module housing or its components is possible.

In other embodiments, the sliding sections in the area of the current collector lugs can comprise two sliding lugs, between which a centering device for a small contact plate can be arranged, which is used for contacting one of the current collector lugs. The sliding lugs can be designed in such a way that they provide space for the centering device and the small contact plate, with the centering device with the small contact plate attached to the centering device and the electrical conductors connected to the small contact plate not protruding beyond the sliding lug (in a direction from the center of the Pick-up device seen towards the frame side of the pick-up device). This can ensure that in the area where the pouch battery cell contacts the electrical conductors, only the sliding lugs are in sliding, insulating contact with the battery module housing and ensure the delimited insulating installation space for the electrical contacts of the pouch battery cells.

• ein Batteriemodulgehäuse;
• eine Vielzahl von Aufnahmevorrichtungen gemäß einer der oben beschriebenen Ausführungsformen, wobei die Vielzahl von Aufnahmevorrichtungen in einer Richtung senkrecht zur Rahmenrahmebene der Aufnahmevorrichtungen hintereinander angeordnet sind;
• eine Vielzahl von Pouch-Batteriezellen, die jeweils in einer Aufnahmevorrichtung der Vielzahl von Aufnahmevorrichtung eingefasst ist; und
• eine Druckbeaufschlagungsvorrichtung, die dazu eingerichtet ist, einen Druck auf die Vielzahl von Pouch-Batteriezellen auszuüben.

A second aspect of the present invention relates to a battery module. The battery module has:

• a battery module housing;
• a plurality of receiving devices according to one of the embodiments described above, wherein the plurality of receiving devices are arranged one behind the other in a direction perpendicular to the frame frame plane of the receiving devices;
• a plurality of pouch battery cells each encased in a receptacle of the plurality of receptacles; and
• a pressurizing device configured to apply pressure to the plurality of pouch battery cells.

The multiplicity of receiving devices are arranged in such a way that the multiplicity of pouch battery cells have a common (cell) stacking direction. The plurality of pouch battery cells are arranged as a cell stack.

The pressurization device is designed and set up to apply a predetermined (compressive) prestress to the cell stack in the stacking direction and to maintain this over the course of the volume change in the pouch battery cells. The predetermined bias voltage can be dependent, for example, on a charging and/or a discharging state of the pouch battery cell. For this purpose, the pressure application device can have, for example, a plate that can be moved relative to the cell stack. Due to the change in volume of the individual pouch battery cells during a charging or discharging phase, the pouch battery cells change their position in the cell stack. Therefore, the pressure plate must be tracked to allow a constant preload on the cell stack.

The pouch battery cells are protected along their sealing seam by the enclosure in the corresponding receiving devices, while at the same time a guided movement of the pouch battery cells within the battery module housing is enabled by the receiving device.

According to one embodiment, the pressurizing device may comprise a force generating element (hydraulic) coupled to the plate and capable of displacing the plate relative to the cell stack. In a further embodiment, the pressurizing device can comprise a transmission device via which the force generating element is coupled to the plate. With the translation device, a force generated by the force generating element can be transmitted/changed and directed to the plate.

The performance, the service life and the structural stability of the large number of pouch battery cells and thus of the battery module can be guaranteed by the uniform pre-tension on the cell stack.

A third aspect of the present invention relates to a vehicle with one of the battery modules described above. The vehicle can have an electrified powertrain and include the battery module as a traction battery.

• 1 schematisch eine Pouch-Batteriezelle;
• 2a, 2b schematisch eine Aufnahmevorrichtung gemäß einer ersten Ausführungsform;
• 3a, 3b Querschnittsansichten der Aufnahmevorrichtung aus 2a, 2b;
• 4a-f einen Eckbereich der Aufnahmevorrichtung aus 2a, 2b gemäß verschiedenen Ausführungsformen;
• 5 schematisch einen Teil eines Batteriemoduls;
• 6 ein Kontaktierungsplättchen für die Aufnahmevorrichtung;
• 7a-c schematisch ein Verschalten von mehreren, in Aufnahmevorrichtungen eingefassten Pouch-Batteriezellen;
• 8a, 8b schematisch ein Batteriemodul bzw. einen mäanderförmigen Verlauf von elektrischen Leitern;
• 9a-c schematisch eine teilweise Draufsicht und eine Querschnittsansicht des Batteriemoduls aus 8a;
• 10a, 10b schematisch eine Aufnahmevorrichtung gemäß einer zweiten und dritten Ausführungsform; und
• 11 schematisch eine Fahrzeug mit dem Batteriemodul aus 8a.

Embodiments of the invention will now be described by way of example and with reference to the accompanying drawings. It shows:

• 1 schematic of a pouch battery cell;
• 2a , 2 B schematically a recording device according to a first embodiment;
• 3a , 3b Cross-sectional views of the receiving device 2a , 2 B ;
• 4a-f a corner area of the receiving device 2a , 2 B according to various embodiments;
• 5 schematically a part of a battery module;
• 6 a contacting pad for the receiving device;
• 7a-c schematically an interconnection of a plurality of pouch battery cells enclosed in receiving devices;
• 8a , 8b schematically a battery module or a meandering course of electrical conductors;
• 9a-c schematically shows a partial plan view and a cross-sectional view of the battery module 8a ;
• 10a , 10b schematically a recording device according to a second and third embodiment; and
• 11 schematically shows a vehicle with the battery module 8a .

1 shows schematically a pouch battery cell 100, which can be enclosed in a receiving device 1 described below. The pouch battery cell 100 includes a stack of layers 103 encased in an outer shell. The layer stack includes layers of electrode material and separator material. The sides of the outer shell are thermally welded so that a you gel seam 105 arises, which encircles the layer stack 103 . The sealing seam 105 is therefore present on the peripheral side of the pouch battery cell 100 . The pouch battery cell 100 also includes two current collector lugs 107 for making contact with a contacting pad 40 described later. During a discharging and charging process of the pouch battery cell 100, the volume of the pouch battery cell 100 changes in the area of the layer stack 103. The pouch battery cell 100 expands during the charging process and contracts during the discharging process.

2a shows schematically a receiving device 1 according to a first embodiment, in which the pouch battery cell 100 is enclosed. The receiving device 1 is designed in the shape of a frame and allows the volume of the pouch battery cell 100 to change in the layer stacking direction S.

2 B shows a schematic exploded view of the receiving device 1. The receiving device 1 comprises an outer frame 3 and an inner frame 20. The outer frame 3 comprises a receiving section 5, which runs along an (inner) circumference of the outer frame 3 and is provided for receiving the inner frame 20. The outer frame 3 also includes a plurality of latching sections 7, for example latching lugs, for releasably connecting the outer frame 3 to the inner frame 20. On the side of the current collector lugs 7, the outer frame 3 has two sliding sections 9 on its outer circumference, which include sliding lugs.

3a FIG. 12 shows a sectional illustration along the section axis AA, which shows an area of the receiving device 1 with the enclosed pouch battery cell 100, the area being arranged opposite the current collector lugs 107. The pouch battery cell 100 is shown in a discharged state, the change in volume of the pouch battery cell 100 as a result of a charged state being indicated by the dashed line.

The outer frame 3 and the inner frame 20 are arranged in such a way that a sealing seam receiving cavity 13 is formed between the outer frame 3 and the inner frame 20 . The sealed seam 105 can be arranged in the sealed seam receiving cavity 13 . In other words, the sealed seam 105 can be accommodated/enclosed in the sealed seam receiving cavity 13 . in the in 3a In the example shown, the sealing seam receiving cavity 13 is designed in such a way that the sealing seam 105 can be arranged folded over in the sealing seam receiving cavity 13 . For this purpose, the sealing seam receiving cavity 13 comprises a first cavity section 13a, which runs along a neutral line of the pouch battery cell 100 and parallel to a frame plane of the receiving device 1, and a second cavity section 13b, which adjoins the first cavity section 13a and (in the circumferential direction of the receiving device 1 seen) has a cavity cross section which forms an angle of approximately 90° with the cavity cross section of the first cavity section 13a. Consequently, the sealing seam receiving cavity 105 has a curved section 13c with a radius around which the sealing seam 105 can be wrapped.

In the region of the first cavity section 13a, the outer frame 3 and the inner frame 20 can be designed such that the sealing seam 105 can be clamped between the outer frame 3 and the inner frame 20 by a clamping force exerted by the outer frame 3 and the inner frame 20.

Furthermore, the receiving device 1 comprises a latching connection for the detachable connection of the outer frame 3 to the inner frame 20. The latching connection comprises a latching lug 7 on the outside frame, which engages in a correspondingly designed latching section 27 on the inside frame. The outer frame 3 and the inner frame 20 are formed from a material that allows elastic deformation of the locking lug 7 and the locking portion 27 to enable the locking connection. In some examples, the outer frame and the inner frame 20 may be formed from a resilient plastic material, such as polyamide 6 with a glass fiber content of 30 percent (PA6-GF30).

Furthermore, in 3a 1, the outer frame 3 has, on its inner peripheral side, an inner peripheral chamfer 15 provided on an outward edge. The inner frame 20 also has, on its inner peripheral side, an inner peripheral chamfer 25 provided at an outward edge. On its outer peripheral side, the outer frame 3 has a first outer peripheral chamfer 17a and a second outer peripheral chamfer 17b. Each of the bevels 15, 17a, 17b, 25 runs along the entire circumference of the outer frame 3 or the inner frame 20 and thus along the circumference of the receiving device 1.

Sliding sections 16 are also provided on the outer frame 3 and run at least partially along the outer circumference of the outer frame 3 .

3b shows a sectional view along the section axis AA, which represents an area of the receiving device 1 with the bordered pouch battery cell 100, the area in the Current collector lugs 107 is arranged. In this area, the outer frame has two centering devices 11 for centering and thus for fastening/receiving the contacting plates 40 and the sliding sections 9 designed as sliding lugs. The centering devices 11 each have two centering lugs 11a.

Furthermore, in 3b to recognize that the sealing seam receiving cavity 13 is designed to be open in order to lead the current collector lugs 107 out of the receiving device 1 . For this purpose, the outer frame 3 and the inner frame 20 are arranged in such a way that a lead-through section 13d is formed between them, through which the current collector leads 107 can be guided (in the form of a labyrinth). A cross section of the lead-through section 13d runs (seen in the circumferential direction of the receiving device 1) essentially parallel to the cross section of the first cavity section 13a. To form the lead-through section 13, in the region of the current collector lugs, the outer frame 3 has a projection 18 on the outer frame and the inner frame 20 has a projection 28 on the inner frame, each of which protrudes perpendicularly from the outer circumference of the outer frame 3 and the inner frame 20. Furthermore, the projection 18 on the outer frame and the projection 28 on the inner frame have a radius 18a on the outer frame and a radius 28a on the inner frame, respectively, which face the current collector lugs 107 . The projection 18 on the outer frame and thus the radius 18 on the outer frame protrude further than the projection 28 on the inner frame or the radius 28a on the inner frame. If the current collector lugs 107 move due to the volume changes of the pouch battery cell, the radius 18a on the outside frame and the radius 18b on the inside frame can prevent the current collector lugs 107 from buckling in an area in which the current collector lugs 107 are led out of the sealing seam 105.

As in the area of the first cavity section 13a, the outer frame 3 and the inner frame 20 can also be designed in the area of the lead-through section 13d in such a way that the sealing seam 105 is caused by the clamping force exerted by the outer frame 3 and the inner frame 20 between the outer frame 3 and the inner frame 3 can be clamped.

4a-f show different embodiments for a (in 1 marked) Corner area B of the receiving device 1. The peripheral sealing seam receiving cavity 13 or the receiving device 1 is at least partially recessed or cut free (exposed) in the corner area B, so that the sealing seam 105 is at least partially exposed or open. In other words, the receiving device 1 has a recessed area 14 at its corner area B; 14';14", which is arranged on the outer frame 3. As a result, the formation of folds on the sealing seam 105 can take place in such a way that the folds exert as little stress as possible on the sealing seam 105. The other corner regions of the receiving device 1 can also be cut out accordingly.

In 4a a recess 14 on the outer frame side is shown according to a first example. The recess 14 is designed in such a way that the sealing seam 105 is completely exposed in the corner area B of the receiving device. The sealing seam 105 has folds (not shown) that are formed by folding the sealing seam 105 over.

In 4b 1 is shown an embodiment for the inner frame 20 that includes an optional inner frame side recess 24 . Due to the recess 24 on the inside of the frame, more space can be provided for folding over the sealing seam 105 .

In 4c an external view of a recess 14' on the outer frame side according to a second embodiment is shown. The recess 14' on the outer frame includes a plurality of lugs 14a', which protrude from the outer frame 3 perpendicularly to the plane of the frame. The plurality of tabs 14a' are arranged in a fan shape and are configured to fence the seal 105 in place. In 4d an interior view of the recess 14' on the outer frame side is shown. The plurality of lugs 14a' each include a hooked end portion 14b'.

In 4e is an inside view of a recess 14" on the outer frame side according to a second embodiment. The recess 14" on the outer frame side includes a lug 14a" which protrudes from the outer frame 3 perpendicularly to the frame plane. The lug 14a" includes a hook-shaped end section 14b". of the outer frame 3, a free cut (or recess, slit) 14c" is provided at opposite ends of the nose 14a", which is provided to accommodate the folds formed in the sealing seam 105.

The plurality of lugs 14a′ or lug 14a″ can prevent sealing seam 105 from rubbing against a battery module housing 201 of a battery module 200 (described later).

4f shows a cross-sectional view in the circumferential direction of the receiving device 1 in the corner region B. The sectional view runs through one of the plurality of lugs 14a' or the lug 14a". The plurality of lugs 14a' are or the lug 14a" is arranged in such a way that the sealing seam receiving cavity 13 in the region of the recesses 14; 14';14" has a larger cross section compared to the remaining area of the sealing seam receiving cavity 13, which runs along the remaining circumference of the receiving device 1. Furthermore, an inner peripheral side of the plurality of lugs 14'a or the lug 14" can have a larger radius than the remaining inner peripheral side of the outer frame 3. Due to the larger cross section of the seal receiving cavity 13 and the larger radius, more space can be provided for folding over the sealed seam 105, so that the folds formed in the sealed seam 105 exert as little stress as possible on the sealed seam 105 and the sealed seam 105 is protected can be.

Furthermore, in order to reduce the formation of folds, corners of the sealing seam 105 can be trimmed in such a way that they each have a rounding (seen in the stacking direction).

5 12 shows part of the battery module 200. A multiplicity of pouch battery cells 100 are shown here, which are arranged in series in the (cell) stacking direction and thus form a cell stack. The multiplicity of pouch battery cells 100 are each held in one of the receiving devices 100 described above. To couple the multiplicity of pouch battery cells 100 , the contacting plates 40 can be electrically conductively connected to one another with the current collector lugs 107 , for example welded, and the contacting plates 40 can in turn be electrically conductively connected to one another via elastic electrical conductors 60 .

In 6 is a contact plate 40 from 5 shown in more detail. The contacting lamina 40 is designed in the form of a lamina and has contact surfaces 41 for connecting the contacting lamina 40 to the electrical conductors 60 on an upper side and an underside. The contacting pad 40 is formed from an electrically conductive material, such as copper. In the example shown, the contact surfaces 41 are in the form of welding contact surfaces for welding the contacting plate 40 to the electrical conductors 60 . In other embodiments, the contacting platelet can also be electrically conductively connected to the electrical conductors 60 at the contact surfaces 41 via other connection options. Furthermore, the contacting plate 40 includes through holes 43 for receiving the centering lugs 11a. The through-holes are arranged in a middle section of the contacting plate 40 which is located between the contact surfaces 41 . A current collector lug contact area 45 for electrically conductive connection to one of the current collector lugs 107 is also provided on an upper side of the middle section.

In 7a a connection contact side of the outer frame 3 is shown in a front view of the receiving device 1 . The outer frame 3 includes a separating section 19 which divides the connection contact side into two contacting areas. It can be seen here that a contacting space 12 for cell contacting is provided between the sliding lugs 9, in which space the centering devices 11 are provided. The contacting space 12 is divided by a separating section 19 arranged on the outer frame 3 . The contacting space 12 is provided in such a way that it does not protrude further from the outer frame 3 than the sliding lugs 9. The sliding lugs 9 comprise sliding sections 16 on contact surfaces that are in contact with the battery module housing 201.

7b shows a side view of a multiplicity of receiving devices 1 which are arranged one behind the other, with the pouch battery cells 100 being in an uncharged state. It can be seen here that the electrical conductors 60 are oversized, so that the electrical conductors 60 sag and form a loop.

7c shows the side view 7a , wherein the pouch battery cells 100 are in a charged state. Due to the change in volume of the pouch battery cells 100, the individual receiving devices 1 move relative to one another in the cell stacking direction Z. The electrical conductors 60 can compensate for this movement due to the excess (in the uncharged state of the pouch battery cells 100). Consequently, when pouch battery cells 100 are in a charged state, the electrical conductors 60 are in an approximately stretched state. Thus, the oversize or the looping of the electrical conductors 60 allows their strain relief during a charging process of the battery module 200.

In 8a the battery module 200 is shown schematically. The battery module 200 includes the battery housing 201, in which a plurality 203 of receiving devices 1 are arranged in rows and in the cell stacking direction Z one behind the other. A pouch battery cell 100 is enclosed in each receiving device 1 of the plurality 203 of receiving devices 1 .

The battery module 200 includes a pressurization device 205 which is set up to apply pressure to the plurality of pouch Exercise battery cells 100. The pressure application device 205 is designed and set up to apply a predetermined (compressive) prestress to the cell stack in the layer stacking direction S or cell stacking direction Z and to maintain this over the course of the volume change in the pouch battery cells 100 . The pressurizing device 205 comprises a (pressure) plate 205a that can be moved relative to the cell stack. Due to the change in volume of the individual pouch battery cells 100 during a charging or discharging phase, the pouch battery cells 100 change their position in the cell stack due to their change in volume. Therefore, the plate 205a can be tracked to allow a constant bias on the cell stack. To this end, the pressurizing device 205 includes a force generating element 205b coupled to the plate 205a and capable of displacing the plate 205a relative to the cell stack.

This in 8a The battery module 200 shown can be used, for example, as a traction battery for a vehicle 300 described later. Furthermore, the battery module 200 can be used, for example, as an electrical storage device for an agricultural or working machine, a mobile additional battery (“power bank”), means of electric transport, electric aircraft (e.g. a flying drone), an uninterruptible power supply (UPS), an industrial application or a home application, a solar system buffering or a fast charging station can be used. The battery module 200 can thus be used in all areas in which batteries are used.

8b shows schematically the entire course of an interconnection 50 in the battery module 200. The interconnection 50 includes the electrical conductors 60 and represents a current path that couples the individual pouch battery cells 100 to one another via the current collector lugs 107 and connects terminal poles 70 to one another in an electrically conductive manner. The interconnection 50 runs in a meandering pattern, so that it is prevented that a line length of the electrical conductors 60 via a cell stack requires compensation over the length of the entire cell stack over the large range of movement (of the pouch battery cells 100). As a result, the loops formed in the electrical conductors 60 only have to compensate for the movement between adjacent pouch battery cells 100 . This is described in more detail using an interconnection section 51 of the interconnection 50 as an example. In the interconnection section 51, a cell stack (not shown) is interconnected. In the wiring section 51, the electrical conductors 60 are divided into a plurality of conductor sections 60a-f, each of which couples a group of pouch battery cells 100 to one another in the cell stack. Because the conductor sections 60a-f form a meandering course of the interconnection 50, movements of the grouped pouch battery cells 100 are compensated for by the corresponding conductor sections 60a-f. A movement of the groups of pouch battery cells 100 is smaller than a movement of the entire cell stack. Due to the meandering course, the individual conductor sections 60a-f therefore have to compensate for less movement compared to a single “straight” conductor section that interconnects the entire cell stack and runs along the cell stack in the direction of the cell stack.

9a shows a schematic partial plan view of the battery module 200. A first cell stack row 203a and a second cell stack row 203b of the battery module 200 are shown schematically, which are arranged parallel to one another in the cell stacking direction Z and are separated from one another by a partition 207. The partition wall 207 prevents the first and second cell stack rows 203a, 203b arranged in parallel or the receiving devices 1 from tilting or getting caught and can be formed from PA6-GF30, for example.

9b FIG. 2 schematically shows a partial side view of the battery module 200 in an uncharged state. The partition wall 207 includes a first partition wall portion 207a and a second partition wall portion 207b. The partition wall 207 is therefore formed in at least two parts. 9c schematically shows a partial side view of the battery module 200 in a charged state. The first and second partition wall sections 207a, 207b are movable relative to each other. Furthermore, the first and the second partition wall section 207a, 207b are designed in such a way that they (seen in the side view) at least partially overlap, regardless of the state of charge of the battery module 200. For this purpose, as in 9b and 9c As shown, the first and second partition wall portions 207a, 207b may be L-shaped and interlocking. Further, the first and second partition wall portions 207a, 207b (in a direction perpendicular to the plane of the drawing of Fig 9a seen from above) each have wedge-shaped cross sections, wedge tips being respectively arranged at ends of the first and second partition wall sections 207a, 207b which face one another. The wedge-shaped design prevents the partition wall 207 and thus the first and second partition wall sections 207a, 207b from getting caught on the pouch battery cells 100 and/or on the receiving devices 100.

In 10a a receiving device 1' is shown according to a second embodiment, in which an outer frame 3' and an inner frame 20' are designed in such a way that several pouch battery cells are formed len 100 side by side. In an alternative embodiment that is not shown, the receiving device 1′ can be designed to enclose a plurality of pouch battery cells 100 one on top of the other.

10b shows a receiving device 1" according to a third embodiment. In this embodiment, the outer frame 3 and the inner frame 20 are connected to one another via a pivoting element (not shown), e.g the pivot axis S is provided on a short side (shown here) of the receiving device 1. Alternatively, the pivot axis S can also run along a long side of the receiving device 1.

In 11 a vehicle 300 designed as a passenger car is shown. In other embodiments, vehicle 300 may also be in the form of a commercial vehicle (LCV), a truck (lorry) or a bus. Furthermore, the vehicle can be designed as a watercraft, for example a ship with an electric or partially electric drive, or as an aircraft. Vehicle 300 includes battery module 200, for example as a traction battery module.

Reference List

1; 1'; 1''

recording device

3; 3'

outer frame

5

recording section

7

detents

9

sliding noses

11

centering device

11a

centering masons

13

seal receiving cavity

13a

first cavity section

13b

second cavity section

13c

curvature section

13d

implementation section

15

inner peripheral chamfer on the outer frame

16

sliding sections

17a, b

outer peripheral chamfer on the outer frame

18

head Start

18a

radius

19

separation section

20; 20'

inner frame

25

inner peripheral chamfer on the inner frame

27

rest section

28

head Start

28a

radius

40

contact plate

41

contact surfaces

43

through hole

45

collector tab contact surface

50

interconnection

51

interconnection section

60

electrical conductors

60a-f

ladder sections

70

connection poles

100

Pouch battery cell

103

layer stack

105

sealing seam

107

current collector flags

200

battery module

201

battery module housing

203

Variety of recording devices

203a

first row of cells

203b

second row of cells

205

pressurization device

205a

(Printing plate

205b

force generating element

207

partition wall

207a

first partition wall section

207b

second partition section

300

vehicle

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102010051010 A1 [0009]

Claims (10)

Receiving device (1; 1'; 1") for a pouch battery cell (100), which has a sealing seam (105) on the circumference and current collector lugs (107) protruding from the sealing seam (105), the receiving device (1; 1'; 1 ") is frame-shaped and includes: an outer frame (3; 3'); and an inner frame (20; 20'); wherein the inner frame (20; 20') is arranged in the outer frame (3; 3') in such a way that a sealing seam receiving cavity (13) is formed between the outer frame (3; 3') and the inner frame (20; 20'), in the sealing seam (105) of the pouch battery cell (100), in particular folded, can be arranged. Recording device (1; 1';1") claim 1 , wherein the outer frame (3; 3') and the inner frame (20; 20') are designed such that the sealing seam (105) can be clamped at least partially between the outer frame (3; 3') and the inner frame (20; 20'). is. Receiving device (1; 1'; 1") according to one of the preceding claims, wherein the sealing seam receiving cavity (13) is recessed in corner regions of the receiving device (1; 1'; 1"). Retaining device (1; 1'; 1") according to one of the preceding claims, which further comprises a snap-in connection for the detachable connection of the outer frame (3; 3') to the inner frame (20; 20'), wherein in particular the outer frame (3; 3 ') comprises a locking lug for locking the inner frame (20; 20') on the outer frame (3; 3'). Recording device (1; 1'; 1") according to one of the preceding claims, wherein at least one of the outer frame (3; 3') and the inner frame (20; 20') has an inner peripheral chamfer (15) which is directed outwards . Recording device (1; 1'; 1") according to one of the preceding claims, which also has a chamfer (17a, 17b) on the outer peripheral side. The cradle (1; 1'; 1") according to any one of the preceding claims, further comprising outer peripheral sliding portions (16) for slidably guiding the cradle (1; 1'; 1") in a battery module case (200). Recording device (1; 1';1") claim 7 , wherein the sliding sections (16) in the region of the current collector lugs (107) comprise two sliding lugs (9) and between the sliding lugs (9) a centering device (11) for a contacting plate (40) for contacting one of the current collector lugs (107) is arranged. Battery module (200) comprising: a battery module housing (201); a plurality (203) of receiving devices (1; 1'; 1") according to any one of the preceding claims, which are arranged one behind the other in a direction perpendicular to the plane of the frame of the receiving devices (1; 1'; 1"); a plurality of pouch battery cells (100), each of which is enclosed in a receptacle (1; 1'; 1") of the plurality (203) of receptacles (1; 1'; 1"); and a pressurization device (205) configured to exert pressure on the plurality of pouch battery cells (100). Vehicle (100) with a battery module (200). claim 9 .

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