Pouch cell assembly for a battery pack, battery pack, and housing assembly for same, in particular for lightweight vehicles and electrical devices

Abstract

The invention relates to a pouch cell assembly (20) for a battery pack (40), comprising a first and a second pouch cell (1, 1a, 1b), each of which has a first electrode (2, 2a, 2b) in the form of a flat body and a second electrode (4, 4a, 4b), the first electrode (2a) of the first pouch cell (1a) lying above the first electrode (2b) of the second pouch cell (1b) in a stacking direction (22), and the first electrode (2a) of the first pouch cell (1a) being electrically conductively connected to the first electrode (2b) of the second pouch cell (1b); a printed circuit board (24), which is situated between the first electrode (2a) of the first pouch cell (1a) and the first electrode (2b) of the second pouch cell (1b) in the stacking direction (22) and has a conductor track (64) connected to the first electrode (2a) of the first pouch cell (1a) and a conductor track (64) connected to the first electrode (2b) of the second pouch cell (1b); and a clamping system (50), by means of which the first electrode (2a) of the first pouch cell (1a) and the first electrode (2b) of the second pouch cell (1b) are pressed against each other in the stacking direction.

Description

[0001] Pouch cell arrangement for a battery pack, battery pack, and a housing arrangement therefor, especially for light vehicles and electrical appliances

[0002] The invention relates to a pouch cell arrangement for a battery pack, a battery pack with at least two such pouch cell arrangements, a housing arrangement for receiving the at least two pouch cell arrangements or the battery pack, and a light vehicle with the at least two pouch cell arrangements or the battery pack.

[0003] Rechargeable battery packs are used in electrical appliances and light vehicles, such as e-bikes and electric scooters, as drive batteries for a motor. Battery packs are also used in cordless power tools. These packs are often made up of pouch cells. Several pouch cells are connected in series and / or parallel so that the battery pack can deliver the necessary voltage and power.

[0004] There is a need to integrate such pouch cell assemblies and battery packs easily and safely into the respective devices. The invention aims to provide a pouch cell assembly that meets these requirements.

[0005] This objective is achieved by a pouch cell arrangement for a battery pack, comprising a first and a second pouch cell, each having a first electrode designed as a flat body and a second electrode designed, for example, as a flat body, wherein the first electrode of the first pouch cell is located in a stacking direction above the first electrode of the second pouch cell and the first electrode of the first pouch cell is electrically connected to the first electrode of the second pouch cell; with a printed circuit board arranged in the stacking direction between the first electrode of the first pouch cell and the first electrode of the second pouch cell, comprising a conductor connected to the first electrode of the first pouch cell and a conductor connected to the first electrode of the second pouch cell;and with a clamping system by which the first electrode of the first pouch cell and the first electrode of the second pouch cell are pressed against each other in the stacking direction.

[0006] This arrangement enables a mechanically stable design for the pouch cell assembly. The circuit board is positioned between the first two electrodes, saving space. The conductive traces allow for current measurement and monitoring of the pouch cells.

[0007] The following describes individually advantageous, independent, and arbitrarily combinable further training courses.

[0008] PCT151241-PEbha According to a further embodiment, the pouch cells can have a pouch section in which the active components of the pouch cell are arranged. The active components can be surrounded in the pouch section by a film, for example, an aluminum foil, a film containing or consisting of another metal, or a plastic film.

[0009] The bag section can be designed as a flat body, for example as a flat cuboid or, more generally, as a flat polyhedron. The bag section can have two flat sides on two opposite sides, which may be oriented perpendicular to the stacking direction. The two opposite flat sides can be connected by narrow sides, particularly circumferentially. The first and second electrodes can be arranged on one of the narrow sides, the end face, and may extend into the interior of the bag section, i.e., through the film.

[0010] The first and second electrodes of a pouch cell can be located on the same narrow side or on different narrow sides, particularly on two opposite narrow sides. The first and second electrodes can be spaced apart transversely to the stacking direction. The direction in which the first and second electrodes are spaced apart when they are located on the same narrow side is referred to below as the width direction. The direction in which the first and second electrodes are spaced apart when they are located on opposite narrow sides of a pouch cell is referred to below as the length direction.

[0011] At least one narrow side of the first and / or second pouch cell, preferably two opposing narrow sides, can have a substantially rigid sidewall. This facilitates stacking the pouch cells or pouch sections on top of each other. In particular, the two narrow sides facing the width can each be provided with such a sidewall.

[0012] The electrodes can have two flat sides whose normal direction runs parallel to the stacking direction. The flat sides of the electrodes can run parallel to the flat sides of the pouch section. This creates a flat pouch cell. The electrodes can be tab-shaped, tab-shaped, or designed as clamps.

[0013] The term "first" electrode does not refer to its polarity, but merely distinguishes the "first" from the "second" electrode. The first electrode of the first pouch cell can therefore be either the positive or the negative pole of the first pouch cell. Similarly, the second electrode of the first pouch cell can be the opposite pole, i.e., the negative or the positive pole of the first pouch cell. The polarity assignment of the first and second electrodes of the second pouch cell is independent of the polarity assignment of the first and second electrodes of the first pouch cell. For example, the first electrode of the first pouch cell can be the negative pole and the first electrode of the second pouch cell the positive pole of their respective pouch cells. Likewise, the first electrodes of the first and second pouch cells can each have the same polarity.

[0014] In one embodiment, the second electrode of the first pouch cell can also be arranged above the second electrode of the second pouch cell in the stacking direction. The second electrode of the first pouch cell can be electrically connected to the second electrode of the second pouch cell. Alternatively, the second electrode of the first pouch cell can be galvanically isolated from the second electrode of the second pouch cell.

[0015] In the pouch cell arrangement, the first and second pouch cells, in particular their pouch sections, can be stacked on top of each other. The pouch sections can lie directly on top of each other, for example, by the films or, in particular, the rigid side walls of the stacked pouch cells supporting each other.

[0016] Alternatively, the first and second pouch cells can be positioned opposite each other transversely to the stacking direction and, in particular, also transversely to the width direction or longitudinally. In both cases, it is possible to arrange the first and second electrodes one above the other in the stacking direction.

[0017] The clamping system can be designed differently depending on requirements. In one embodiment, for example, it can clamp around the first and / or second electrodes stacked on top of each other. In another embodiment, the clamping system is designed for repeated, non-destructive use. This means that it can be removed and reused, for example, when a pouch cell in the pouch cell array needs to be replaced. In one embodiment, the clamping system is galvanically isolated from the first and second electrodes of the first and second pouch cells.

[0018] The clamping system can alternatively or cumulatively comprise at least one retaining bolt extending in the stacking direction, for example, a rod or pin, a threaded rod, a threaded bolt, or a screw. To exert the force applied by the clamping system in the stacking direction as centrally as possible on the electrodes, the first electrodes of the first and second pouch cells and / or the second electrodes of the first and second pouch cells can each have a recess through which the retaining bolt protrudes. The at least one printed circuit board can also have such a recess.

[0019] Thus, a (first) retaining bolt can penetrate the first electrodes of the first and second pouch cells and the circuit board located between these two first electrodes. A further, or second, retaining bolt can penetrate the second electrodes of the first and second pouch cells and the circuit board located between these two second electrodes.

[0020] The recess can be designed as a through-hole or a recess in an electrode or the circuit board. The first and / or second retaining bolt then extends through the respective through-hole or recess.

[0021] The at least one retaining bolt can be used not only to create a mechanical connection in the stacking direction, but also to align the electrodes and the at least one circuit board as precisely as possible with each other. Advantageously, head elements can be arranged at at least one or each end of the first and / or second retaining bolt located in the stacking direction, by which the battery pack is held together in the stacking direction. The first and second electrodes of the first and second pouch cells, with the circuit board between them, can be arranged between two head elements.

[0022] If the clamping system features a threaded connection, this offers the advantage that, for example, the head element can be repeatedly detached from its associated retaining bolt without damaging the electrodes and pouch cells. The first and / or second retaining bolts can also be designed to be removed from their recesses without damage. With this design, it is possible to repeatedly disassemble the circuit board and electrode assembly, allowing individual pouch cells to be removed and replaced. This can be achieved, for example, by designing the first and / or second retaining bolt as a threaded rod, screw, or bolt. The head element can be, for example, a screw head or a nut. A stamping plate can be positioned between the stack of the first electrodes and / or the stack of the second electrodes to distribute the force more evenly and simplify assembly.

[0023] In one embodiment, the retaining pins can be galvanically isolated from the first and / or second electrodes of the first and second pouch cells. For example, at least one of the retaining pins can be enclosed in an insulating sleeve made of an insulating material. The insulating sleeve is positioned between an electrode and the retaining pin extending through that electrode. This is, of course, only necessary if the retaining pins are made of an electrically conductive material, such as a metal. However, the pins can also be made of a non-conductive material, such as a plastic or a composite material.

[0024] Alternatively, the retaining bolt can extend alongside the first and / or second electrodes in the stacking direction, so that it does not penetrate the electrodes.

[0025] The pouch cell array can include one or more printed circuit boards (PCBs). A PCB can extend in the stacking direction between the first electrode of the first pouch cell and the first electrode of the second pouch cell, as well as between the second electrode of the first pouch cell and the second electrode of the second pouch cell, particularly if these electrodes are located on the same face of the array. Alternatively, the PCB can extend laterally across the entire width of the first and second pouch cells. Or, one PCB can be positioned between the first electrode of the first pouch cell and the first electrode of the second pouch cell, and another PCB can be positioned between the second electrode of the first pouch cell and the second electrode of the second pouch cell.

[0026] The power and / or capacity of a single pouch cell is typically insufficient for the reliable operation of an electrical appliance or light vehicle. Therefore, pouch cell configurations often require pouch cells to be connected in series or parallel. Such a circuit necessitates that at least one electrode of the first pouch cell is electrically connected to at least one electrode of the second pouch cell, for example, the positive terminal of the first pouch cell to the negative terminal of the second pouch cell, or the positive terminal of the first pouch cell to the positive terminal of the second pouch cell. Preferably, the circuit board establishes this connection between two electrodes stacked on top of each other to minimize current paths.

[0027] In one embodiment, the printed circuit board can have a via that electrically connects the first electrode of the first pouch cell to the first electrode of the second pouch cell in the stacking direction. The via can, for example, at least partially surround the cutout in the printed circuit board through which the first centering pin extends. The first electrode of the first pouch cell and the first electrode of the second pouch cell can be in direct contact with the via.

[0028] In one embodiment, the second electrode of the first pouch cell and / or the second electrode of the second pouch cell can be in contact with the printed circuit board (PCB). In a further embodiment, the at least one PCB can have a via that electrically connects the second electrode of the first pouch cell to the second electrode of the second pouch cell in the stack direction. The via can, for example, at least partially surround the recess in the PCB through which the second retaining pin extends. The second electrode of the first pouch cell and the second electrode of the second pouch cell can be in direct contact with the via. Alternatively, the second electrode of the first pouch cell and the second electrode of the first pouch cell can also be galvanically isolated by the PCB.

[0029] In particular, the printed circuit board (PCB) can have a first conductor track that contacts the second electrode of the first pouch cell. The PCB can have a second conductor track, not directly electrically connected to the first, that contacts the second electrode of the second pouch cell. The PCB can have a contact area at the point where the second electrode of the first pouch cell contacts the PCB and / or at the point where the second electrode of the second pouch cell contacts the PCB, which is connected to the current sensor. The contact area can be formed by the end of either the first or the second conductor track. Each of these conductor tracks can be connected to a current sensor.

[0030] The circuit board can contain electronic components. At least one electronic component can be configured to monitor the first pouch cell and / or the second pouch cell. Such monitoring can be achieved, for example, using the conductor tracks mentioned above.

[0031] For example, the printed circuit board can have at least one current sensor configured to measure the voltage and / or current of the first and / or second pouch cell. In particular, such a current sensor can be used to monitor each individual pouch cell of the pouch cell assembly separately. A separate current sensor can be provided for each pouch cell of the pouch cell assembly. The current sensor is then connected to the first and second electrodes of the pouch cell whose current and / or voltage it is configured to measure. The current sensor can, for example, be conductively connected to the via.

[0032] In one embodiment, the circuit board can have at least one temperature sensor. In particular, each pouch cell can be assigned its own separate temperature sensor. The circuit board can have a thermal bridge that connects the temperature sensor to its assigned pouch cell. In another embodiment, the temperature sensor can also be in direct contact with its assigned pouch cell of the pouch cell arrangement, in particular with the pouch section or one of the two electrodes of the pouch cell.

[0033] A further embodiment provides that the circuit board has a connector on one side facing the stacking direction and a mating connector on the other side facing the stacking direction, the mating connector being designed complementary to the connector, wherein the connector and the mating connector can be arranged in alignment with each other in the stacking direction. The connector and / or mating connector can be connected to the at least one temperature sensor and / or the at least one current sensor of the circuit board. The connector and the mating connector can be multi-pin and have an identical pin assignment.

[0034] The arrangement of plug and mating plug in the stacking direction in alignment with each other makes it possible, when stacking several pouch cell arrangements on top of each other in the stacking direction, to plug together the plug of one circuit board with the mating plug of the other circuit board adjacent in the stacking direction.

[0035] Connectors and mating connectors can be designed specifically for signal transmission and not for the transmission of power currents. For example, connectors and mating connectors can be part of a bus system connected to the battery management system.

[0036] In one embodiment, the plug and mating plug of a printed circuit board are arranged transversely to the stacking direction, particularly in the width direction, between the first electrodes of the first and second pouch cells and the second electrodes of the first and second pouch cells. This arrangement can be made, in particular, centrally between these two electrode pairs. The insertion direction of the plug and mating plug is, in particular, aligned parallel to the stacking direction.

[0037] A battery pack can be easily constructed from the pouch cell arrangement in one of the above embodiments, which can serve as an energy source, for example, to power an electrically driven light vehicle or an electrical appliance. Such a battery pack has at least two pouch cell arrangements in one of the above embodiments, i.e., at least a first pouch cell arrangement and a second pouch cell arrangement. The first and second pouch cell arrangements are stacked on top of each other in the stacking direction.

[0038] The battery pack further comprises a contact arrangement having at least one conductive spacer and at least one non-conductive spacer. The spacers can be designed, for example, as turned parts, in particular as spacer rings. Each spacer can be penetrated by one of the retaining bolts. For this purpose, each spacer can be provided with a recess, in particular with a through-hole.

[0039] The conductive spacer electrically connects the two electrodes of the first and second pouch cell arrangements, which are arranged directly on top of each other in the stacking direction, while the non-conductive spacer galvanically isolates the two electrodes of the first pouch cell arrangement and the second pouch cell arrangement, which are arranged directly on top of each other in the stacking direction.

[0040] For example, the conductive spacer electrically connects the first electrode of the second pouch cell of the first pouch cell array to the first electrode of the first pouch cell of the second pouch cell array that is directly opposite it, particularly in the stacking direction. The non-conductive spacer then separates the second electrode of the second pouch cell of the first pouch cell array from the second electrode of the first pouch cell of the second pouch cell array.

[0041] Alternatively, the conductive spacer can electrically connect the second electrode of the second pouch cell of the first pouch cell arrangement with the second electrode of the first pouch cell of the second pouch cell arrangement, while the non-conductive spacer galvanically isolates the first electrode of the second pouch cell of the first pouch cell arrangement from the first electrode of the first pouch cell of the second pouch cell arrangement.

[0042] Alternatively, the conductive spacer can electrically connect the first electrode of the second pouch cell of the first pouch cell arrangement with the second electrode of the first pouch cell of the second pouch cell arrangement, while the non-conductive spacer separates the second electrode of the second pouch cell of the first pouch cell arrangement from the first electrode of the first pouch cell of the second pouch cell arrangement.Alternatively, a conductive spacer can electrically connect the second electrode of the second pouch cell of the first pouch cell array to the second electrode of the first pouch cell of the second pouch cell array, while another conductive spacer can electrically connect the first electrode of the second pouch cell of the first pouch cell array to the first electrode of the first pouch cell of the second pouch cell array that is directly opposite it, particularly in the stacking direction. This type of connection allows, for example, a parallel connection of pouch cell arrays stacked one above the other.

[0043] With these alternative configurations, any sequence of series and parallel connections between stacked pouch cell arrangements is therefore possible.

[0044] The retaining bolt penetrating the non-conductive spacer can be galvanically isolated from the circuit board by the non-conductive spacer. For this purpose, the non-conductive spacer can penetrate the circuit board in the stacking direction, for example, by surrounding the retaining bolt in a sleeve-like manner. The spacers can be nested in the stacking direction, for example, by having a sleeve-like extension, which can also penetrate the circuit board, of one spacer inserted into a recess of the spacer following it in the stacking direction.

[0045] Individual or all conductive spacers can be separated from the retaining bolt passing through them by an insulating sleeve located between the retaining bolt and the conductive spacer. The insulating sleeve can extend in one piece over the entire length of the retaining bolt as it passes through the conductive spacers. Alternatively, the insulating sleeve can be composed of several individual sleeves stacked side by side, allowing for a modular extension of the insulating sleeve.

[0046] A spacer can also be used in a pouch cell array. For example, a pouch cell array might have a spacer positioned between the second electrode of the first pouch cell and the second electrode of the second pouch cell, while the circuit board is positioned between the first electrode of the first pouch cell and the first electrode of the second pouch cell. The spacer can be conductive or non-conductive.

[0047] Furthermore, a conductive spacer can be used instead of or in addition to a via in the printed circuit board. In this case, the printed circuit board can have an opening through which the spacer extends. In a further embodiment, a conductive spacer can be located on one or both sides of the via, bearing against the printed circuit board and against one of the electrodes of one of the pouch cells of the pouch cell assembly.

[0048] In the battery pack, the connector of the first pouch cell arrangement can be plugged into the mating connector of the second pouch cell arrangement.

[0049] Preferably, the plug and mating plug are designed to be movable relative to each other in the stacking direction when plugged together and, in particular, also secured by a positive locking mechanism, in order to allow movements of components of the pouch cell arrangement relative to each other, for example when the clamping system is actuated.

[0050] If the battery pack has more than two pouch cell arrangements, each individual pair of such a battery pack of immediately adjacent pouch cell arrangements can be considered to be composed of a first pouch cell arrangement and a second pouch cell arrangement.

[0051] A housing arrangement adapted to the pouch cell arrangement in one of the above embodiments and / or the battery pack with at least two such pouch cell arrangements may be provided.

[0052] Such a housing arrangement includes, for example, a housing for receiving a pouch cell arrangement or a battery pack.

[0053] The housing arrangement can further include a pressure plate located within the housing, which can be fixed in various positions spaced apart from one another in the stacking direction. The pressure plate is particularly arranged and configured to press against a pouch section of the uppermost or lowermost pouch cell of the pouch cell arrangement or battery pack in the stacking direction.

[0054] The pressure plate prevents the pouch section from inflating and fixes the pouch cells in the stack.

[0055] The pressure plate can be designed to be repeatedly fixed in spaced-apart positions, for example, by using a clamping device with a thread or lever. This makes it possible to release the force pressing the pouch sections against each other and to remove the pouch cell assemblies or the battery pack from the housing. The pressure plate can be stationary within the housing or stationary on the pouch sections. In one embodiment, the housing is formed from a profile tube, for example, an extruded or rolled profile. The housing can be made of a metal material, for example, aluminum, a plastic, or a composite material. It can, in particular, be part of a light vehicle frame or a power tool housing. The battery management system can be arranged within the housing.

[0056] In one embodiment, two pressure plates opposite each other in the stacking direction can be provided, between which the pouch sections of stacked pouch cells are arranged. Both pressure plates can be repeatedly fixed in different positions spaced apart from each other in the stacking direction. In this way, the stack of pouch cells can be compressed on both sides.

[0057] Busbars can be arranged between the pressure plate and the housing to tap into the electrical power supplied by the pouch cell assemblies.

[0058] In a further embodiment, the housing can have a guide through which the pressure plate is guided in a straight line in the stacking direction.

[0059] The guide can be designed to create a positive fit only in the width direction, so that the pressure plate can be inserted into the housing in the longitudinal direction of the profile, the longitudinal direction preferably being perpendicular to the stacking direction and the width direction. Such a guide facilitates the insertion of the battery pack and prevents the pressure plate from tilting in the housing.

[0060] Finally, a pouch cell arrangement as described above, or a battery pack as described above, can be used in a light vehicle as the traction battery for the drive motor. A light vehicle is defined as a single- or multi-track vehicle with a total weight of less than 800 kg. The light vehicle may also have a housing as described above in which the battery pack is located.

[0061] The following are exemplary embodiments explained with reference to the accompanying drawings. In accordance with the above explanations, individual features of the respective embodiment may be omitted if the technical effect associated with these features is not relevant for a particular application. Conversely, in accordance with the above explanations, a feature described above that is not present in an embodiment may also be added if the technical effect associated with the feature to be added is relevant for a particular application.

[0062] In the figures, the same reference symbols are used for features that correspond to each other in terms of function and / or structure.

[0063] They show:

[0064] Fig. 1 is a schematic perspective view of an embodiment of a pouch cell;

[0065] Fig. 2 is a schematic top view of part of a modification of the pouch cell of Fig. 1;

[0066] Fig. 3 shows a schematic perspective view of an embodiment of a pouch cell arrangement;

[0067] Fig. 4 shows another schematic perspective view of the pouch cell arrangement of Fig. 3;

[0068] Fig. 5 is a schematic perspective view of a battery pack;

[0069] Fig. 6 shows a schematic side view of the battery pack of Fig. 5;

[0070] Fig. 7 shows a schematic sectional view along the plane VII-VII of the battery pack of Fig. 5;

[0071] Fig. 8 shows a schematic side view of a housing arrangement for holding a battery pack;

[0072] Fig. 9 shows a schematic perspective view of a battery pack with parts of the housing arrangement;

[0073] Fig. 10 shows a schematic sectional view of another pouch cell arrangement;

[0074] Fig. 11 shows a schematic sectional view of another pouch cell arrangement;

[0075] Fig. 12 shows a schematic sectional view of another pouch cell arrangement; Fig. 13 shows a schematic sectional view of another battery pack;

[0076] Fig. 14 shows a schematic sectional view of another battery pack.

[0077] Fig. 1 shows a pouch cell 1, which has a first electrode 2 and a second electrode 4. The designations "first" electrode and "second" electrode are intended only to distinguish the two electrodes 2 and 4 from one another. This designation does not imply a specific polarity assignment for the electrode. Thus, the first electrode 2 can form the positive or the negative pole of the pouch cell 1, while the second electrode then forms the corresponding opposite pole.

[0078] The pouch cell 1 may further comprise a pouch section 6. Within pouch section 6, the active layers of the pouch cell are enclosed in a film 8. The first and second electrodes 2, 4 project away from pouch section 6. They may extend into the interior of pouch section 6.

[0079] The pouch cell 1 can, in particular, have two opposing flat sides 10, which can be connected to each other by narrow sides 12. The first and second electrodes 2, 4 can, in particular, project from a narrow end face. On one or more narrow sides 12, for example, the longer narrow sides or the narrow sides adjoining the narrow end face, the pouch section 8 can be provided with rigid side walls 16.

[0080] The first and second electrodes 2, 4 are, for example, flat bodies whose flat sides 14 run parallel to the flat sides 10 of the bag section 6. The first electrode 2 and the second electrode 4 can, in particular, be clamp-shaped, tab-shaped, or, synonymously, tab-shaped.

[0081] The first and second electrodes 2, 4 are each provided with a through-hole 18. The hole 18 can be in the form of a hole; in Fig. 1, for example, this is a through-hole.

[0082] Fig. 2 shows an alternative embodiment of the recess 18 of the first and second electrodes 2, 4, which here is designed as a recess, for example in the form of a slot open on one side. The recesses 18 of the two electrodes 2, 4 do not have to have the same shape. A single pouch cell 1 is usually insufficient to drive, for example, the motor of an electrical appliance or a light vehicle for a sufficiently long time or to deliver sufficient power. Therefore, several pouch cells are connected in series and / or parallel to each other. In this way, the required voltage and power can be supplied to the motor.

[0083] Figures 3 and 4 show a pouch cell arrangement 20 with a first pouch cell 1a and a second pouch cell 1b connected together. The first and second pouch cells can be identical in design.

[0084] Insofar as a distinction must be made below between the individual first electrodes 2 and the individual second electrodes 4 of pouch cells 1a, 1b, the following applies: 2a designates the first electrode of the first pouch cell 1a, and 2b designates the first electrode of the second pouch cell. 4a designates the second electrode of the first pouch cell 1a, and 4b designates the second electrode of the second pouch cell 1b. Where this distinction is not important, the reference symbols 2, 4 are used. This also applies to pouch cells 1a, 1b, which are grouped under the reference symbol 1.

[0085] In the illustrated embodiment, the first electrode 2a and the first electrode 2b overlap in the stacking direction 22. Likewise, the second electrode 4a and the second electrode 4b of the second pouch cell 1b overlap in the stacking direction 22. In particular, the first and second pouch cells 1a, 1b can be arranged such that the recesses 18 of the respective electrodes 2, 4 are aligned with each other in a stacking direction 22. The stacking direction 22 can be perpendicular to the flat sides 10, 14.

[0086] The assignment of the first and second electrodes 2, 4 of the pouch cells 1a, 1b to the positive and negative polarities depends on the specific application. For example, the electrodes 2a, 2b arranged one above the other in the stacking direction 22 can have the same or opposite polarities.

[0087] In Figures 3 and 4, the arrangement of the two pouch sections 6 opposite each other transversely to the stacking direction 22 is merely exemplary. An arrangement of the electrodes 2a, 2b or 4a, 4b lying one above the other in the stacking direction 22 can also be achieved if the pouch sections 6 of the pouch cells 1a, 1b lie one above the other or directly on top of each other in the stacking direction 22. A circuit board 24 is arranged between the two first electrodes 2a, 2b and / or between the two second electrodes 4a, 4b. In particular, the circuit board can extend between both the first electrodes 2a, 2b and the second electrodes 4a, 4b.

[0088] In a lateral direction 26, in which the first and second electrodes 2, 4 of a single pouch cell 1 are spaced apart, the circuit board 24 can project beyond the first and second electrodes 2a, 2b, 4a, 4b on both sides. The lateral direction 26 runs in particular parallel to the flat sides 10, 14 and perpendicular to the stacking direction 22.

[0089] The circuit board 24 can also be provided with a recess 18 which, in the pouch cell arrangement 20, aligns with one of the recesses 18 of the respective first and second electrodes 2a, 2b or 4a, 4b. In particular, the circuit board 24 can have two recesses 18. In this case, one of the two recesses 18 aligns with the recess 18 of the first electrodes 2a, 2b, and the other of the two recesses 18 aligns with the recess 18 of the second electrodes 4a, 4b. The recesses 18 of the circuit board 24 can have a different shape than the recesses 18 of electrodes 2, 4.

[0090] The circuit board 24 can be provided on one side with, for example, a multi-pin connector 28, which can be plugged together with a complementary counterpart connector 28 in the plug-in direction 22.

[0091] The printed circuit board 24 has a connector 28 on each of its two sides located in the stacking direction 22. Each connector 28 may have two or more poles. In one embodiment, the connector 28 on one side of the printed circuit board 24 located in the stacking direction 22 is configured as a complementary mating connector 30 to the connector 28 on the other side of the printed circuit board 24 located in the stacking direction 22. The connectors 28 and 30 are aligned in the stacking direction 22, so that the connectors 28 and 30 of two printed circuit boards 24 stacked one above the other in the stacking direction 22 can be plugged together when the recesses 18 are aligned. In particular, the plugs 28, 30 can be located in the pouch cell arrangement 20 between the electrodes 28, 30, for example in the width direction 26 centrally or off-center between the first electrodes 2a, 2b on one side and the second electrodes 4a, 4b on the other side.Of course, the plugs 28, 30 can also be arranged in the width direction on one of the two sides of the two electrode pairs 2a, 2b and 4a, 4b, i.e. for example to the left or right of the first and second electrodes 2, 4.

[0092] The printed circuit board 24 can have electronic components 32. In another embodiment, however, the printed circuit board 24 can also have only conductor tracks that are connected to electronic components arranged elsewhere. Such components can, for example, be found in a structurally separate battery management system (reference numeral 66, Fig. 1).

[0093] 7) be accommodated.

[0094] For example, the printed circuit board 24 can have electronic components 32 in the form of one or more temperature sensors 34. In one embodiment, each of the pouch cells 1a, 1b can be assigned its own, in particular a different, temperature sensor 34. The temperature of at least one pouch cell 1a, 1b can be monitored by means of the at least one temperature sensor 34. In one embodiment, two temperature sensors 34 can be arranged, one of which is configured to detect the temperature of pouch cell 1a, and the other temperature sensor is configured to detect the temperature of the second pouch cell 1b. The at least one temperature sensor 34 can be connected to the pouch cell 1a, 1b, in particular to the first or second electrode 2, 4 of this pouch cell 1a, 1b.

[0095] The circuit board 24 can further comprise at least one current sensor 38 as an electronic component 32, which is designed to detect the voltage and / or current generated by the pouch cell arrangement 20.

[0096] Connectors 28 and 30 are used to transmit signals received from a battery management system (reference numeral 66 in Fig. 7), for example, a computer. For instance, the signal outputs of the electronic components 32, such as the at least one temperature sensor 34 and / or the current sensor 38, are connected to one or more poles of connector 28 and the mating connector 30, so that the signals supplied by the at least one temperature sensor 34 and / or current sensor 38 can be accessed at connector 28 and mating connector 30. The pouch cell arrangement 20 can be configured, in particular, to be connected to a bus system, for example, a CAN bus or another system, by means of connectors 28 and 30. A corresponding component for coupling the at least one electronic component 32 to the bus system can also be included on the circuit board 24.

[0097] If no bus system is used, each electronic component 32 can be connected to a different pin of connector 32 or the mating connector 30. This is necessary, for example, if the signals of the electronic components 32 are transmitted purely analogously.

[0098] Individual or all electrodes 2, 4 of the pouch cells 1a, 1b can be in direct contact with the circuit board 24. Fig. 5 shows a battery pack 40 composed of a plurality of pouch cell assemblies 20 as shown in Figs. 3 and 4. The number and arrangement of the pouch cell assemblies 20 in the battery pack 40 depends on the application. However, the battery pack 40 should comprise at least two stacked assemblies 20.

[0099] In one embodiment of the battery pack 40, the pouch cells 1a, 1b are positioned opposite each other transversely to the stacking direction 22, with the electrodes 2, 4 of the two pouch cells 1a, 1b arranged between the pouch sections 6 of the pouch cells 1a, 1b. This allows two stacks 42, 44 to form in the stacking direction 22. Alternatively, only a single stack 42 or 44 may be present.

[0100] In a stack 42, 44, the side walls 16 of the pouch areas 6 of the pouch cells 1a or 1b, which are stacked 22 above each other in the stacking direction, preferably lie directly on top of each other. In this way, each stack 40, 42 has a defined height.

[0101] For example, the first pouch cells 1a, with their respective pouch sections 6, are stacked one on top of the other in the stacking direction 22, thus forming a first stack 42, while the second pouch cells 1b of the stacking arrangements 20, with their pouch sections 6, are stacked one on top of the other in the stacking direction 22, forming a second stack 44. The individual stacking arrangements 20 of the battery pack 40 can be identical in one embodiment.

[0102] The first electrodes 2 of all first and second pouch cells 1a, 1b of the battery pack are stacked one above the other in the stacking direction 22 such that their recesses 18 (not visible in Fig. 5) are aligned in the stacking direction. The same applies to the second electrodes 4 of all pouch cells 1a, 1b of the battery pack 40. In this way, a retaining bolt 46 can be inserted through the recesses 18 of the first electrodes 2 or the second electrodes 4, respectively, which are aligned in the stacking direction. For example, a first retaining bolt 46a is inserted through the recesses 18 of the first electrodes 2, which are stacked one above the other in the stacking direction 22. A second retaining bolt 46b can be inserted through the recesses 18 of the second electrodes 4, which are stacked one above the other in the stacking direction 22. The first and / or second retaining bolt 46a, 46b can be made of a non-conductive or conductive material.For example, each of the retaining bolts 46a, 46b can be a threaded rod or a screw made of metal, plastic, or a composite material. If the retaining bolt 46a and / or the retaining bolt 46b is made of a conductive material, it can be galvanically isolated from the electrodes 2, 4 through which it passes. The connectors 28 and mating connectors 30 of the circuit boards of the battery pack 40 are connected to each other. Access to each individual electronic component 32 of each circuit board 24 is possible via the connector 28 or mating connector 30 of the circuit board 24, which is arranged at the top or bottom in the stacking direction 22.

[0103] As shown in Fig. 6, a spacer 48 is located between each first pouch cell arrangement 20a of the pouch cell arrangements 20 of a battery pack 40 and a second pouch cell arrangement 20b of the pouch cell arrangements 20 of the battery pack 40 adjacent to it in the stacking direction 22. This spacer can be designed in a ring-shaped form, i.e., as a spacer ring. The spacer 48 can be penetrated by the retaining bolt 46 in the stacking direction 22. In particular, the electrodes 2, 4 of the first and second pouch cell arrangements 20a, 20b, which are opposite each other in the stacking direction 22, bear against the spacer 48. The spacers 48 are part of a contacting arrangement 49 with which a battery pack 40 can be assembled from at least two pouch cell arrangements 20.

[0104] In one embodiment, the first electrodes 2 arranged one below the other in the stacking direction 22 of successive pouch cell arrangements 20 in the stacking direction 22 are each separated by a first spacer 48a. A first spacer 48a is therefore located between the two adjacent first electrodes of the first and second pouch cell arrangements 20a, 20b in the stacking direction 22.

[0105] Accordingly, a second spacer 48b can be arranged between the second electrodes 4 of the first pouch cell arrangement 20a and the second pouch cell arrangement 20b, which are directly opposite each other in the stacking direction 22.

[0106] Depending on whether the first or second electrodes 2, 4 adjacent to a spacer 48a, 48b are to be electrically connected to each other or galvanically isolated from each other, the spacer 48 is made of an electrically conductive material, for example aluminum, copper, or an aluminum and / or copper alloy, or of an electrically insulating material, for example ceramic or plastic. In one embodiment, the spacers 48 are turned parts.

[0107] In one embodiment, the spacers 48 can each be provided with a recess 18 that aligns with the recesses 18 of the adjacent electrodes 2, 4 and the recess 18 of the printed circuit boards 24 arranged overlapping in the stacking direction 22. The retaining bolts 46a, 46b serve—particularly together with the spacers 48—for the mechanical retention and alignment of the electrodes 2, 4 and the printed circuit boards 24, as well as the pouch cell assemblies 20. The retaining bolts 46a, 46b are part of a clamping system 50.

[0108] The clamping system 50 can be configured, in particular, to create a repeatedly releasable mechanical connection between the electrodes 2, 4 and the circuit boards 24. For this purpose, each retaining bolt 46a, 46b can provide a screw connection. Such a screw connection is easy to loosen and can be loosened multiple times, so that each individual pouch cell 1a, 1b is replaceable. A high clamping force in the stacking direction 22 is not necessarily required.

[0109] Fig. 7 shows a schematic sectional view along arrows VI1-VII of Fig. 4. The first electrodes 2 of the stack 42, which lie directly one above the other in the stacking direction 22, are all electrically connected to each other. Depending on whether the first electrode 2a of the first pouch cell 1a and the first electrode 2b of the second pouch cell 1b, which is arranged overlapping it in the stacking direction 22, have the same or opposite polarity, parallel and series circuits of the pouch cell arrangements 1 can be combined and assembled as desired using the setup shown in Fig. 6. The second electrodes 4 of the battery pack 40 are all galvanically isolated from each other.

[0110] To electrically connect the first two electrodes 2a, 2b (or alternatively the second electrodes 4a, 4b) of a pouch cell arrangement 1, the circuit board 24 can be provided with a via 52. The via 52 can, in particular, at least partially surround the recess 18.

[0111] The first electrodes 2a, 2b of a pouch cell arrangement 1 can, in one embodiment, be in direct or indirect contact with the via 52. The electrodes 2 are thus electrically connected to each other. The first electrodes 2 of two different pouch cell arrangements 1, arranged successively in the stacking direction 22, are electrically connected to each other by an electrically conductive spacer 48a.

[0112] The spacers 48a, which connect successive first electrodes 2 of two successive pouch cell arrangements 1 in the stacking direction 22, are electrically conductive. The spacers 48b, which bear against the successive second electrodes 4 of two pouch cells 1 adjacent in the stacking direction 22, are non-conductive in the embodiment shown by way of example in Fig. 7. Furthermore, the circuit board 24 lacks a via in the area where the second electrodes 4 bear against the circuit board 24.

[0113] The spacers 48b can have a section 52 extending through the recess 18, which contacts the spacer arranged on the other side of the printed circuit board 24 in the stacking direction 22. For example, the section 52 can be inserted into a receptacle 54 of the spacer 48 on the other side of the printed circuit board 24 in the stacking direction 22. This provides continuous galvanic isolation of the printed circuit board 24 from the retaining bolt 46b in the stacking direction 22.

[0114] Such a design is also possible for the conductive spacers 48a.

[0115] To galvanically isolate the retaining bolts 46a, which extend through the vias 52, from the electrodes 2 and the spacers 48a, an insulating sleeve 58 can be arranged between the retaining bolt 46a and the via 52. This insulating sleeve can extend in one piece through all the recesses 18 penetrated by the retaining bolt 46a. Alternatively, the insulating sleeve 58 can also be formed from ring segments stacked one above the other in the direction 22, so that it can be more easily extended modularly. The height of a ring segment in the stacking direction 22 corresponds to the height of a pouch cell arrangement 20.

[0116] A termination plug 60 can be provided at one end of the plugs 28 and mating plugs 30 connected in the stacking direction 22. A connection 62 to the battery management system 66 can be connected at the other end located in the stacking direction 22. Even if the second electrodes 4a, 4b located on a circuit board 24 are not connected to each other via the circuit board 24, the circuit board 24 can have conductor tracks 64, each of which is connected to one of the second electrodes 4a, 4b.

[0117] For example, a conductor track 64a can be conductively connected to the second electrode 4a of the first pouch cell of a pouch cell arrangement 1, and a conductor track 64b can be conductively connected to the second electrode 4b of the second pouch cell 1b of a pouch cell arrangement 20, for example, by the electrodes 4a, 4b, contacting the corresponding conductor tracks 64a, 64b. The conductor tracks 64a, 64b can be connected to electronic components 32, as described above. Each conductor track 64, 64a, 64b can terminate in a contact area 65 that contacts one of the electrodes 2, 4 located therein. The via 52 can also be connected to an electronic component 32 via a conductor track 64 of the circuit board 24. An end plate 68 made of an electrically insulating material can be provided at an end of the battery pack 40 located in the stacking direction 22. The end plate 68 can extend over the entire or only part of the base area of ​​the battery pack 40.The pouch cell arrangements are positioned between the end plate 68 and a head section 70, for example, a screw head or nut of the clamping system 50. All electrical and electronic connections for the battery pack 40, such as the terminal 62, can be located at the end opposite the end plate 68 in the stacking direction. The terminal posts 72 of the battery pack 40 can also be accessible from this side.

[0118] Fig. 10 schematically shows another pouch cell arrangement 20. The following discussion focuses solely on the differences compared to the embodiments described above. In the pouch cell arrangement 20 of Fig. 11, a separate circuit board 24 is located only between each pair of electrodes 2a, 2b or 4a, 4b. For example, a first circuit board 24a is arranged between the first electrode 2a of the first pouch cell 1a and the first electrode 2b of the second pouch cell 1b. A second circuit board 24b is arranged between the second electrode 4a of the first pouch cell 1a and the second electrode 4b of the second pouch cell.

[0119] The printed circuit boards can project laterally, perpendicular to the stacking direction 22, over the electrodes 2, 4 or pouch cells 1, so that they are easily accessible in the stacking direction 22. A connector 28 or mating connector 30 can be located in the laterally projecting section 76. Alternatively, connections for electrical lines 78 can be provided at this point, connecting the printed circuit boards to a battery management system (not shown). As described above, the first printed circuit board 24a can electrically connect the first electrodes 2a, 2b to each other, for example, by means of a via 52.

[0120] Depending on whether the two pouch cells 1a, 1b are to be connected in series or in parallel, the second circuit board 24b can galvanically isolate the two second electrodes 4a, 4b from each other (series connection) or connect them, for example, by means of a through-line 52 (not shown), as with the first electrode (parallel connection). The first circuit board 24a and / or the second circuit board 24b do not necessarily have to contain electronic components. It may be sufficient, for example, if conductive traces 64 are provided by the respective circuit board 24a, 24b for current measurement.

[0121] Regardless of whether a single printed circuit board 24 or two separate printed circuit boards 24a, 24b are arranged, the clamping system 50 can also be configured differently. For example, in Fig. 11, the clamping system does not extend through the electrodes 2, 4 and the printed circuit boards 24a, 24b. Therefore, a recess 18 is not required for the electrodes 2, 4 and / or the printed circuit board 24. Instead, the clamping system 50 extends laterally, i.e., transversely to the stacking direction 22, next to the electrodes 2, 4 in the stacking direction 22. To press the electrodes 2, 4 towards each other in the stacking direction or against the printed circuit board 24, two plunger plates 74 are provided, which are arranged above and below the electrodes 2, 4 in the stacking direction 22, and aligned with them in the plunger direction 22. The clamping system 50 is designed to clamp the two plunger plates towards each other. For this purpose, for example, a screw connection with a retaining bolt 46 can be used, as shown.Alternatively, a spring assembly (not shown) can also be used. Due to the pressure plates 74, only a single retaining bolt 46 is sufficient for the clamping system 50 of Fig. 11.

[0122] In the embodiment of Fig. 11, the circuit board 24 extends only between the first electrode 2a of the first pouch cell 1a and the first electrode 2b of the second pouch cell 1b. Between the second electrode 4a of the first pouch cell 1a and the second electrode 4b of the second pouch cell 1b, there is a spacer 47, which can be conductive or non-conductive depending on the connection of the pouch cells.

[0123] Fig. 12 shows a further embodiment of a pouch cell arrangement 20. Here, the clamping system 50 has retaining clips that grip the electrodes 2, 4 arranged one above the other in the stacking direction 22. Each electrode pair 2a, 2b or 4a, 4b is assigned a separate retaining clip that presses this electrode pair together in the stacking direction 22. Of course, instead of the retaining clip, a retaining bolt 46 as shown in Fig. 10 or, if the electrodes 2, 4 have a recess 18, as shown in Figs. 5 to 7, can also be used.

[0124] A printed circuit board 24a is arranged between a pair of electrodes, here the electrode pair 2a, 2b. This printed circuit board can be designed like the printed circuit board in the embodiment of Fig. 11. The printed circuit board 24 of Fig. 12 has, for connection with further printed circuit boards 24 above and below it in the stacking direction 22, a connector 28 on one side located in the stacking direction 22 and a mating connector 30 on the other side located in the stacking direction 22, as already described above.

[0125] Between the other electrode pair, here electrode pair 4a, 4b, another circuit board 24b can be located, which can correspond in its design to circuit board 24a. Alternatively, a spacer 48 can be located between the second pair of electrodes 4a, 4b, as shown in Fig. 11. Depending on the wiring of the pouch cells 1a, 1b, the spacer 48 can be conductive or non-conductive.

[0126] Fig. 13 shows a battery pack 40 with a plurality of pouch cell assemblies 20. Each pouch cell assembly has a circuit board 24 located between the pair of first electrodes 2 of the respective pouch cell assembly 20, and a conductive or non-conductive spacer 48 located between the pair of second electrodes 4 of the respective pouch cell assembly 20. In such an assembly, each pouch cell 1 is part of two successive pouch cell assemblies 20 stacked in the same direction.

[0127] In this embodiment, a circuit board 24 and a spacer 48 are arranged alternately between successive electrode pairs 2 and 4 in the stacking direction 22. Each pouch cell arrangement 20 of the battery pack 40 has only one circuit board 24 and one spacer 48. The number of pouch cell arrangements 20 in the battery pack 40 is arbitrary. If a circuit board 24 is arranged between two electrodes, these are designated as first electrodes 2. If a spacer 48 is arranged between two electrodes, these are designated as second electrodes 4.

[0128] In the battery pack 40, each electrode 2, 4 is connected to a circuit board 24, so that, for example, a current measurement for each pouch cell 1 can be carried out via the conductor tracks 64 described in Fig. 11. Since in the battery pack 40 of Fig. 13 there is a circuit board 24 on one side of an electrode located in the stacking direction 22, in one pouch cell arrangement 20, and a spacer 48 on the other side of this electrode located in the stacking direction 22, in the other pouch cell arrangement 20, one and the same electrode is a first electrode 2 in one pouch cell arrangement 20 and a second electrode 4 in the other pouch cell arrangement 20 adjacent in the stacking direction 22.

[0129] The sequence of pouch cell arrangements 20 in the battery pack of Fig. 13 can also be transferred to a configuration of pouch cell arrangements 20 similar to Fig. 12. Fig. 14 accordingly shows a battery pack 40 with pouch cell arrangements 20, in which the electrodes 2, 4 of the pouch cells 1 are arranged on narrow sides 12 opposite each other in the longitudinal direction, transverse to the stacking direction 22.

[0130] As in Fig. 13, in the battery pack 40 of Fig. 14, a circuit board 24 is arranged alternately between one electrode pair and a spacer 48 between the next pair in the stacking direction 22. Reference can therefore be made to the details in Fig. 13. The spacer can be conductive, as in Fig. 12, if the circuit requires a conductive connection between the electrode pairs 2 and 4 stacked on top of each other in the stacking direction 22, or non-conductive if the electrode pair 2 or 4 is to be galvanically isolated.

[0131] Any of the above-described configurations can be used as the clamping system 50. For example, the electrodes 2, 4 of the pouch cells 1, which are arranged opposite each other transversely to the stacking direction 22, can also be provided with recesses 18 through which a retaining bolt protrudes. Alternatively, the configurations shown in Figures 11 and 12 can be used.

[0132] Fig. 8 shows a section through a housing assembly 80 for receiving the battery pack 40. The housing assembly 80 has a housing 82, which is made, for example, from an extruded profile, such as an aluminum extrusion profile, a plastic extrusion profile, or a composite profile, for example, containing carbon fibers. The housing 82 can, for example, be formed from a tube of a frame of a light vehicle, such as an e-bike or an electric scooter, or from the housing of an electrical device.

[0133] The battery pack 40 can, for example, be inserted into the housing 82 transversely to the stacking direction 22, in particular in the direction in which the pouch cells 1a, 1b of a pouch cell arrangement 20 are opposite each other (as shown in Fig. 3 and 4).

[0134] To prevent the pouch areas 6 (Fig. 1) of the pouch cells 1 from inflating and to ensure that the battery pack 40 is securely fixed in the housing 82, a pressure plate 84 can be provided, which is arranged at an end of the battery pack 40 located in the stacking direction 22. In one embodiment, the pressure plate 84 bears, particularly under force, exclusively against the pouch areas 6 of the lowest or highest pouch cell 1 in the stacking direction 22. An identical pressure plate 84 can also be provided at the opposite end in the stacking direction. A separate pressure plate 84 can be provided for each stack 42, 44.

[0135] The pressure plate 84 is pressed against the pouch sections 6 of the pouch cells 1 by a clamping device 86. The clamping device 86 can, for example, have at least one screw 88 screwed into the housing, which can be moved against the pressure plate 84 to press against the pouch sections 6. The screw 88 can be designed as a threaded stud, as shown. A clamping device 86 with a pressure plate 84 can be provided at both ends of the battery pack 40 located in the stacking direction 22. Both clamping devices 86 can be identical. In addition, a separate clamping device 86 can be provided for each stack 42, 44. To prevent excessive tilting of the pressure plate 84 when the clamping device 86 is actuated and at the same time to provide guidance when inserting the battery pack 40 into the housing 82, a longitudinal guide 90 can be provided at at least one end 2 located in the stacking direction 22.The longitudinal guide 90 blocks relative movement of the pressure plate 84 in only one spatial direction, for example, the width direction 26. In the simple embodiment shown in Fig. 8, the longitudinal guide 90 consists of a tongue-and-groove arrangement extending transversely to the width direction 26 and the stacking direction 22. Part of the tongue-and-groove arrangement—for example, the spring—is located on the pressure plate 84, and another part on the housing 82. The pressure plate 84 can be made of a plastic, a composite material, or a metal material, such as aluminum. Fig. 8 shows that a separate pressure plate 84 or a separate pair of pressure plates 84 can be provided for each of the two stacks 42, 44 of the battery pack 40. In one embodiment, the pressure plates 84 do not cover the electrodes 2, 4 or circuit boards 24 in the stacking direction 22. In Fig.Figure 9 finally shows that a busbar 92 can be used as a pole connection.

[0136] Reference sign

[0137] 1 pouch cell

[0138] 1a first pouch cell

[0139] 1b second pouch cell

[0140] 2 first electrode

[0141] 2a First electrode of the first pouch cell

[0142] 2b first electrode of the second pouch cell

[0143] 4 second electrode

[0144] 4a second electrode of the first pouch cell

[0145] 4b second electrode of the second pouch cell

[0146] 6 bag section

[0147] Slide 8

[0148] 10 Flat side of the bag section

[0149] 12 Narrow side of the bag section

[0150] 14 Flat side of the electrode

[0151] 16 Side wall of the bag section

[0152] 18 recess

[0153] 20 pouch cell arrangement

[0154] 20a first pouch cell arrangement

[0155] 20b second pouch cell arrangement

[0156] 22 stacks in the direction

[0157] 24 circuit boards

[0158] 24a first circuit board

[0159] 24b second circuit board

[0160] 26 Latitude

[0161] 28 plugs

[0162] 30 mating plugs

[0163] 32 electronic component

[0164] 34 Temperature sensor

[0165] 36 Thermal bridge

[0166] 38 Current sensor

[0167] 40 battery pack

[0168] 42 first stack

[0169] 44 second stack 46 retaining bolts

[0170] 46a first retaining bolt

[0171] 46b second retaining bolt

[0172] 48 spacer

[0173] 48a first spacer

[0174] 48b second spacer

[0175] 49 Contact arrangement

[0176] 50 clamping system

[0177] 52 Vias

[0178] 54 Section of a spacer extending through the recess

[0179] 56. Intake of a spacer

[0180] 58 Insulating sleeve

[0181] 60 termination plugs

[0182] 62 Connection to battery management system

[0183] 64 conductor track

[0184] 64a first conductor track

[0185] 64b second conductor

[0186] 65 Contact area

[0187] 66 Battery Management System

[0188] 68 End plate

[0189] 70 Head section

[0190] 72-pin connector

[0191] 74 stamp plate

[0192] 76 outstanding section

[0193] 80 Housing arrangement

[0194] 82 cases

[0195] 84 Pressure plate

[0196] 86 Clamping device

[0197] 88 screw

[0198] 90 Longitudinal guidance

[0199] 92 busbar

Claims

Claims 1. Pouch cell arrangement (20) for a battery pack (40), comprising a first and a second pouch cell (1 , 1 a, 1b), each having a first electrode (2, 2a, 2b) designed as a flat body and a second electrode (4, 4a, 4b), wherein the first electrode (2a) of the first pouch cell (1 a) is located in a stacking direction (22) above the first electrode (2b) of the second pouch cell (1b) and the first electrode (2a) of the first pouch cell (1a) is electrically connected to the first electrode (2b) of the second pouch cell (1 b); with a circuit board (24) arranged in the stacking direction (22) between the first electrode (2a) of the first pouch cell (1a) and the first electrode (2b) of the second pouch cell (1b) and having a conductor track (64) connected to the first electrode (2a) of the first pouch cell (1a) and a conductor track (64) connected to the first electrode (2b) of the second pouch cell (1b);and with a clamping system (50) by which the first electrode (2a) of the first pouch cell (1a) and the first electrode (2b) of the second pouch cell (1b) are pressed against each other in the stacking direction.

2. Pouch cell arrangement (20) according to claim 1, wherein the first pouch cell (1a) and the second pouch cell (1b) are arranged one above the other or opposite each other in the stacking direction (22) or transversely to the stacking direction (22).

3. Pouch cell arrangement (20) according to claim 1 or 2, wherein the circuit board (24) has a via (52) which electrically connects the first electrode (2a) of the first pouch cell (1a) to the first electrode (1b) of the second pouch cell (1b) in the stacking direction (22).

4. Pouch cell arrangement (20) according to one of claims 1 to 3, wherein the clamping system (50) has a retaining bolt (46a), the retaining bolt (46a) extends in the stacking direction (22) and passes through the first electrode (2a) of the first pouch cell (1a) and the first electrode of the second pouch cell (2a).

5. Pouch cell arrangement (20) according to one of claims 1 to 4, wherein the second electrode (4a) of the first pouch cell (1a) is located in the stacking direction (22) above the second electrode (4b) of the second pouch cell (2b) and a printed circuit board (24) is arranged between the second electrode (4a) of the first pouch cell (1a) and the second electrode (4b) of the second pouch cell (2b), the printed circuit board having a conductor track (64) connected to the second electrode (2a) of the first pouch cell (1a) and a conductor track (64) connected to the second electrode (2b) of the second pouch cell (1b).

6. Pouch cell arrangement (20) according to claim 5, wherein the second electrode (4a) of the first pouch cell (1a) and / or the second electrode (4b) of the second pouch cell (1b) is in contact with the circuit board (24).

7. Pouch cell arrangement (20) according to any one of claims 1 to 6, wherein the clamping system (50) has a retaining bolt (46a) which extends in the stacking direction and passes through the first electrode (2a) of the first pouch cell (1a) and the first electrode of the second pouch cell (2a).

8. Pouch cell arrangement (20) according to one of claims 1 to 7, wherein the circuit board (24) comprises at least one electronic component (32) in the form of a current sensor (38) for measuring a voltage and / or a current of the first pouch cell (1a) and / or second pouch cell (1b) and wherein the current sensor (38) is conductively connected to the via (52) via the first and second conductor tracks (64).

9. Pouch cell arrangement (20) according to one of claims 1 to 8, wherein the circuit board (24) has a temperature sensor (34) which is connected to the first and / or second pouch cell (1a, 1b) via a thermal bridge (36).

10. Pouch cell arrangement (20) according to one of claims 1 to 9, wherein the circuit board (24) has a connector (28) on one side facing in the stacking direction (22) and a mating connector (30) designed to be complementary to the connector (28) on the other side facing in the stacking direction (22), and wherein the connector (28) and the mating connector (30) are arranged in alignment with each other in the stacking direction (22).

11. Battery pack (40), in particular for powering an electrically powered light vehicle, comprising a first pouch cell arrangement (20, 20a) according to any one of claims 1 to 10 and a second pouch cell arrangement (20, 20b) according to any one of claims 1 to 10, wherein the first and the second pouch cell arrangement (20) are arranged one above the other in the stacking direction (22); and comprising a contacting arrangement (49) comprising a conductive spacer (48, 48a, 48b) and a non-conductive spacer (48, 48a, 48b); wherein - either the conductive spacer (48, 48a, 48b) electrically connects the first electrode (2b) of the second pouch cell (1b) of the first pouch cell arrangement (20a) to the first electrode (2a) of the first pouch cell (1a) of the second pouch cell arrangement (20b). and the second electrode (4b) of the second pouch cell (1b) of the first pouch cell arrangement (20a) is separated from the second electrode (4a) of the first pouch cell (1a) of the second pouch cell arrangement (20b) by the non-conductive spacer (48, 48a, 48b); - or the conductive spacer (48, 48a, 48b) electrically connects the second electrode (4b) of the second pouch cell (1b) of the first pouch cell arrangement (20a) to the second electrode (4a) of the first pouch cell (1a) of the second pouch cell arrangement (20b) and the first electrode (2b) of the second pouch cell (1b) of the first pouch cell arrangement (20a) is separated from the first electrode (2a) of the first pouch cell (1a) of the second pouch cell arrangement (20b) by the non-conductive spacer (48, 48a, 48b); - or the conductive spacer (48, 48a, 48b) connects the first electrode (2b) of the second pouch cell (1b) of the first pouch cell assembly (20a) to the second electrode (4a) of the first pouch cell (1a) of the second pouch cell assembly (20b) and the second electrode (4b) of the second pouch cell (1b) of the first pouch cell assembly (20a) is separated from the first electrode (2a) of the first pouch cell (1b) of the second pouch cell assembly (20b) by the non-conductive spacer (48, 48a, 48b).

12. Battery pack (40) according to claim 11, wherein the first and second pouch cell arrangements (20a) are configured according to claim 10 and the plug (28) of the first pouch cell arrangement (20) is inserted into the mating plug of the second pouch cell arrangement (20).

13. Battery pack (40), in particular for powering an electrically powered light vehicle, comprising a first pouch cell arrangement (20) and a second pouch cell arrangement (20) which immediately follows the first pouch cell arrangement (20) in the stacking direction (22), 32 wherein a pouch cell (1) is both part of the first pouch cell arrangement (20) and part of the second pouch cell arrangement (20) and wherein on one side in the stacking direction (22) of an electrode (2, 4) of the pouch cell (1) there is a circuit board (24) and on the other side of the electrode (2, 4) there is a spacer (48).

14. Housing arrangement (80) comprising a housing (82) for receiving a pouch cell arrangement (20, 20a, 20b) according to one of claims 1 to 10 or a battery pack (40) according to one of claims 11 to 13 and comprising a pressure plate (84) arranged in the housing (82), which can be fixed in different positions spaced apart from each other in the stacking direction (22) and is arranged and designed to press against a pouch section (6) of the uppermost or lowermost pouch cell (1, 1a, 1b) of the pouch cell arrangement (20) or the battery pack (40) in the stacking direction (22).

15. Housing arrangement according to claim 14, wherein the housing (82) has a longitudinal guide (90) through which the pressure plate (84) is guided in a straight line in the stacking direction (22).

Images