Battery cell assembly with gas guiding device and vehicle

Abstract

The invention relates to a cell assembly (12), comprising a cell (14) having a cell housing (20), which has a first housing wall (20a) and an openable cell outlet (22) arranged in the first housing wall, and a gas-conducting device (16), the gas guide device has a base element (24) arranged on the first housing wall, an openable gas outlet (28) in the base element, and a flap (26) arranged on the base element, which in a first position (P1) closes the openable gas outlet and covers the cell outlet, and which in a second position (P2) is movable, in the second position, the gas outlet is opened. In this case, the gas-conducting device comprises at least one deformable first connecting element (30a, 30b, 32a, 32b, 34a, 34b), which connects the flap to the base element in a first flap region of the flap, which differs from the end region (26b).

Description

Technical Field

[0001] The present invention relates to a cell assembly with a gas guiding device, wherein the cell assembly has a cell, the cell has a cell housing, the cell housing has a first housing wall and an openable cell exhaust port arranged in the first housing wall, wherein the gas guiding device has a base element arranged on the cell housing, an openable gas outlet in the base element, and a valve arranged on the base element, the valve closing the openable gas outlet and covering the cell exhaust port in a first valve position, wherein the valve can be moved to a flipped-open second position in which the gas outlet is opened, wherein the valve has a first end region that is detached from the base element in the second position and a second end region that is opposite to the first end region, the second end region being located on the base element in the second position, the valve comprising a first side edge and a second side edge that is opposite to the first side edge, the side edges each extending from the first end region to the second end region. In addition, the present invention also relates to a motor vehicle having such a cell assembly. Background Art

[0002] During electrochemical processes, primary cells, in particular secondary cells (which are also referred to as cells within the scope of the present invention), can usually generate high temperatures and gas pressures in the housing outside normal operating conditions. When defined limits are exceeded, these high temperatures and gas pressures are output to the environment, which is also referred to as a fault. This can lead to negative effects on the surrounding cells when the primary cells in the battery are multiple interconnected, since the surrounding cells can be damaged by the hot gases or even stimulated to react themselves. For this purpose, efforts are made to create a barrier that prevents the hot outflowing gases from reaching the surface of the still intact primary cells as much as possible.

[0003] DE 10 2014 208 062 A1 describes a battery system having a plurality of battery cells each having an exhaust port and an exhaust device having a plurality of inlets, wherein the battery cells are respectively connected to the exhaust device via a connecting element connecting the exhaust port to the inlet of the exhaust device. Here, the connecting element is designed so that the gas pressure generated during exhaust causes the exhaust device to move toward the exhausted battery cell. As a result, an improved sealing effect should be achieved. The inlet of the exhaust device can be designed to have a closing element, which opens the inlet under the action of the fluid leaking from the exhaust port of the battery cell connected via the connecting element. The closing element can be a check valve or a bursting element. The closing port can prevent the fluid from flowing out of the exhaust device via the inlet connected to other battery cells.

[0004] Nevertheless, efforts are still made to ensure improved protection of cells that are still intact in the event of a thermal runaway of the cell. Summary of the invention

[0005] The object of the present invention is to provide a battery cell assembly and a motor vehicle which, when gas is discharged from a battery cell, ensures improved protection of other battery cells that are still intact.

[0006] This object is achieved by a cell assembly and a motor vehicle having the features according to the respective independent claim. Advantageous embodiments of the invention are the subject matter of the dependent claims, the description and the drawings.

[0007] The cell assembly with a gas guiding device according to the present invention comprises a cell, the cell having a cell housing, the cell housing having a first housing wall and an openable cell exhaust port arranged in the first housing wall. In addition, the gas guiding device comprises a base element arranged on the cell housing, in particular arranged on the first housing wall, an openable gas outlet in the base element and a valve arranged on the base element, the valve closing the openable gas outlet and covering the cell exhaust port in a first valve position. Here, the valve can be moved to a second position that is flipped open, in which the gas outlet is opened, wherein the valve has a first end region that is detached from the base element in the second position and a second end region that is opposite to the first end region, and the second end region is located on the base element in the second position. In addition, the valve comprises a first side edge and a second side edge that is opposite to the first side edge, and the side edges extend from the first end region to the second end region respectively. Here, the gas guiding device comprises at least one deformable first connecting element, which connects the valve to the base element in a first valve region of the valve that is different from the second end region.

[0008] The great advantage of providing such a deformable first connecting element is that the valve can be stabilized in its second position. By means of such a first connecting element (which is sometimes also referred to as a connecting element below), for example, the maximum opening angle of the valve can be defined. Thus, in an advantageous manner, it is possible to prevent the valve from opening uncontrolled or breaking to any second position when gas is discharged from the opened exhaust port of the battery cell. This in turn enables the valve to additionally realize the gas guiding function and the gas shielding function. Thus, the valve opened in the second position can be used in an advantageous manner to divert the discharged gas flow in the desired direction and, conversely, to prevent excessive flow in the opposite direction. In addition, the provision of such a deformable first connecting element simplifies the connection of the valve to the base element, because it is not necessary to implement such a connection in a complicated manner, for example, by means of a hinge with a constraining function. For example, the valve can be opened simply by bending caused by gas pressure. The deformation of the deformable connecting element can be caused by the opening of the valve. By ultimately being able to provide a significantly more stable and more precise gas deflection function and gas shielding function through the valve in the second position, it is possible to provide an improved protection function for, for example, intact adjacent cells when gas is discharged from the cell. With the help of the valve, the discharged gas flow can be deflected so that the gas flow is not directed in the direction of the adjacent cells as much as possible. On the contrary, in the first position of the valve, an additional protection function for the openable cell exhaust port can be provided by the valve. That is, if another cell is exhausted, for example, the gas discharged from the other cell cannot or is obviously difficult to contact the openable cell exhaust port of the cell because the cell exhaust port is additionally covered by the valve that closes the gas outlet.

[0009] Here, a cell is understood to be a primary cell, in particular an electrochemical energy storage cell. For example, the cell can be designed as a lithium-ion cell. Preferably, the cell is a prismatic cell with a substantially square cell housing. However, applications for round cells and / or soft-pack cells are also conceivable. The openable cell vent is configured so that it is normally closed and can be opened passively depending on the pressure, in particular when the internal pressure in the cell housing exceeds a predetermined threshold value. For example, the openable cell vent can be designed as an overpressure valve and / or a bursting membrane, etc. The cell vent can also be designed as a theoretical rupture site in the cell housing. If the openable cell vent is in a closed state, the cell, in particular the cell housing, is hermetically sealed.

[0010] Preferably, the base element of the gas-guiding device is designed to fix the gas-guiding device to the battery cell. For example, the gas-guiding device can be provided as a whole in the form of an attachment part, which is attached to the first housing wall or fastened to the first housing wall or, in other words, fastened to the battery cell housing. It can be said that the base element holds the flap on the battery cell.

[0011] Furthermore, it is preferred that the gas guiding device is a gas guiding device assigned only to a cell. In a battery having a plurality of cells, it is preferred that each of the cells comprises such a gas guiding device, which is arranged at the associated cell, in particular only at the associated cell.

[0012] Preferably, the gas guiding device is made of a material that is as heat-resistant as possible, and for example includes a metal material, such as steel or stainless steel, and / or includes a non-metallic material, such as glass fiber, mica or other materials. It is also conceivable that fiber-reinforced plastics, such as plastics reinforced with glass fibers and / or ceramic fibers, etc., are used. Here, the valve can have a geometry corresponding to the openable gas outlet in the open state. The gas outlet can be designed as a circle or an angle or have any geometry, wherein a rectangular geometry is preferred. Correspondingly, the same situation applies to the valve. Here, the valve does not necessarily include the following situation when the valve closes the openable gas outlet in the first position: the openable gas outlet is now sealed by the valve in an atmospheric and / or fluid-tight manner. Preferably, in the first position, the valve only rests on the base element in a form-fitting manner and covers or covers the gas outlet. Therefore, it is not necessary to provide a sealed closure by the valve. When the valve is opened, that is, when transitioning from the first position to the second position, the second end region is now left on the base element. Therefore, the second end region of the valve contacts the base element both in the first position of the valve and in the second position of the valve, and preferably also in any intermediate position between the first position and the second position during the transition from the first position to the second position. Here, in the first position of the valve, the first end region of the valve rests on the base element, or is adjacent to the base element, or is at least positioned closer to the base element than in the second position of the valve. Therefore, when the valve is opened, the first end region moves away from the base element. Therefore, at least in the second position of the valve, the first end region is no longer in direct contact with the base element. Here, the valve itself can be designed as a substantially flat component.

[0013] Furthermore, it is preferred that the openable gas outlet is directly opposite to the openable battery cell exhaust port in the first direction. Preferably, the openable gas outlet is at least as large as or larger than the openable battery cell exhaust port.

[0014] The valve is connected to the base element via a deformable connecting element, i.e., at a location of the valve, i.e., at the first valve region, which is different from the second end region of the valve and is therefore not the second end region or is located in the second end region. For example, the valve can be connected to the base element at its side edge or at the first end region via a connecting element. Thus, the connecting element is fastened on the one hand in the first valve region of the valve and on the other hand to the base element. As a result, an improvement in the stabilization and retention of the valve in its second position can be achieved by a greater leverage effect due to the greater distance from the axis of rotation in the region of the second end region.

[0015] Furthermore, the gas guiding device is designed such that when the battery cell is in a venting state in which gas is discharged from the battery cell vent, the valve takes the second position. In particular, the transition of the valve from the first position to the second position is caused by the gas pressure of the gas discharged from the battery cell vent and / or by the opening of the openable battery cell vent. Therefore, the valve is opened passively and does not require manipulation to transfer it from the first position to the second position.

[0016] According to an advantageous embodiment of the invention, the flap can be moved from the first position into the second position by bending in the first end region. Thus, no hinge or other mechanism is required for opening the flap. The flap can be opened simply by bending the flap in the second end region. This allows a particularly simple and cost-effective design of the gas guiding device.

[0017] According to an advantageous design of the present invention, the first end region of the flap is connected to the base element in a material-locked manner. For example, the flap can even be formed integrally with the base element, or the flap can be welded or bonded or otherwise engaged on the base element.

[0018] According to another advantageous design of the present invention, the gas guiding device is designed so that the valve has an inclination in the second position relative to the opening plane where the opened gas outlet is located, and the valve is in a discharge path passing through the gas outlet and perpendicular to the opening plane, in particular, wherein the second position of the valve is the maximum open position of the valve, and at least one first connecting element stipulates the maximum opening angle of the valve in the second position, which is in particular less than 90 degrees. Due to the inclination of the valve in the second position, a particularly advantageous valve diversion effect can be achieved. In particular, in the case of an inclination at an angle of about 45 degrees, it is achieved, for example, that the gas flow discharged from the battery cell along the discharge path is deflected by 90 degrees. Here, other opening angles and corresponding other deflection angles are also conceivable depending on the direction in which the gas flow should be directed.

[0019] By making the opening angle of the valve less than 90 degrees, it can be advantageously achieved that the valve is in the discharge path in the second position. As a result, the gas discharged from the battery cell hits the valve. Preferably, the maximum opening angle is less than 80 degrees, or also less than 70 degrees. As a result, a particularly large valve action surface for gas deflection and shielding can be provided in the second position of the valve. It is also preferred that the opening angle of the valve in the second position is at least 10 degrees, preferably at least 20 degrees, for example also greater than 30 degrees. As a result, the backflow effect of the discharged gas caused by the valve can be advantageously avoided.

[0020] At least one first connecting element can be designed to define a maximum opening angle. In other words, the connecting element prevents the flap from being opened beyond the maximum opening angle. The connecting element thus fulfills a restraining function. This can prevent, for example, the flap from taking up an opening angle of 90 degrees in the second position, at which an effective gas guiding function or gas deflecting function is no longer provided by the flap, although a shielding effect may still exist.

[0021] At least in the second position of the valve, the first end region of the valve can also include an edge of the valve that connects the first side edge and the second side edge to each other. In the case where the valve is designed as a rectangle, these edges, that is, the edge included by the first end region and the two side edges are perpendicular to each other, and the two side edges are parallel to each other. Since the second end region of the valve is directly fastened to the base element, it is not necessary to provide the edge of the valve through the second end region. On the contrary, the second end region includes a boundary line of the valve, which connects the first side edge and the second side edge to each other. Here, the boundary line can also be an assumed boundary line. In the case of a rectangular valve, the boundary line can be parallel to the edge included by the first end region of the valve. Here, it is also preferred that the gas guiding device is arranged on the battery cell so that the assumed boundary line and / or the edge of the valve included by the first end region in the first position extends along a longitudinal extension direction parallel to the second direction. The second direction can be perpendicular to the first direction defined above. Furthermore, preferably, the second direction corresponds to the stacking direction of a cell stack having a plurality of battery cells, in particular prismatic battery cells, arranged side by side, one of which is a cell of the cell assembly. In addition, each cell of such a cell stack can be designed to have a corresponding gas guiding device. Therefore, such a cell stack (which should also be regarded as belonging to the present invention) can include a plurality of cell assemblies arranged side by side in the stacking direction. By orienting the described boundary line parallel to the stacking direction, the valve opens in the direction away from the adjacent battery cell of the cell stack when transitioning to the second position. As a result, the gas flow discharged from the battery cell can be directed away from the adjacent battery cell in a targeted manner and shielded from the adjacent battery cell.

[0022] According to another advantageous embodiment of the invention, the gas guiding device has at least one deformable second connecting element, which connects the valve to the base element in a second valve region of the valve that is different from the second end region and the first valve region, in particular, wherein the first valve region includes a first side edge and the second valve region includes a second side edge. In particular, the first connecting element and the second connecting element can be arranged or fastened at the respective ends of the first and second side edges that are opposite to the second end region. Thus, it is advantageously achieved by a further connecting element that the valve is held in its second position in a more stable manner. In particular, the two connecting elements can be arranged symmetrically to each other, or the connecting elements can be arranged on the respective side edges of the valve. In principle, there is also the possibility of arranging such a connecting element at the first end region of the valve, but this has the disadvantage that the connecting element can hinder the outflowing gas flow in the second position of the valve. Therefore, it is very advantageous to position the connecting element in the region of the side edges of the valve. In addition, when located in the region of the two side edges of the valve, an additional lateral shielding effect can be provided by the connecting element. As a result, the protective function for adjacent cells can be further enhanced, just as in the above-described preferred positioning of the cells in the cell stack. In addition, the second connecting element can be constructed in the same way as described for the first connecting element. The following embodiments and descriptions with reference to the first connecting element or the connecting element in general can also apply to the first connecting element, and can also apply to the second connecting element in a completely similar manner. That is, preferably, the first connecting element is fastened to a first side edge of the valve on the one hand and to a base element on the other hand, and the second connecting element is preferably fastened to a second side edge of the valve and likewise fastened to the base element on the other hand. A significantly more reliable holding function can thereby be provided for the valve, in particular when the valve is in the second position.

[0023] According to another advantageous design of the present invention, at least one first connecting element and in particular also a second connecting element are spring elements, which are designed to apply a restoring force to the valve in the second position for returning the valve to the first position. As long as no gas is discharged from the battery cell, the valve can also be additionally stably maintained in its first position by such a spring element. The gas discharged from the battery cell in the exhaust state causes the valve to open against the restoring force applied to the valve by the spring element. At this time, it can be achieved by the restoring force at the same time that the valve does not open beyond its defined second position at this time. In other words, the maximum opening angle of the valve can be limited by the restoring force. If the gas flow discharged from the battery cell in the exhaust state stops, the restoring force can cause the valve to return to the first position or at least in the direction of the first position. For example, the spring element can be designed as a spring, for example in the form of a leaf spring or a helical spring, etc. Here, the connecting element can also include a plurality of such spring elements.

[0024] According to another advantageous design of the present invention, at least one first connecting element provides a shielding wall in the second position of the valve, which shielding wall partially, mostly or completely covers the envisaged side surface, which is spanned by a first side edge of the valve and a corresponding boundary edge of the base element that limits the openable gas outlet.

[0025] Therefore, if the valve is in the second position, the first side edge of the valve and the corresponding boundary edge of the base element are stretched to form an imaginary side that can be partially, especially mostly, or even completely covered by the shielding wall provided by the connecting element. As a result, a very reliable lateral shielding function can be provided in an advantageous manner. It is particularly advantageous that the aforementioned second connecting element also provides a second shielding wall in a similar manner in the second position of the valve, and the second shielding wall partially, mostly or completely covers the imaginary second side, which is stretched by the second side edge of the valve and the corresponding second boundary edge of the base element that limits the openable gas outlet, wherein the second boundary edge can be positioned opposite to the first boundary edge. For example, if the gas outlet is a rectangular gas outlet, the boundary edges can be two parallel and opposite edges of the gas outlet. Here, the length of the first side edge of the valve can basically correspond to the length of the first boundary edge, and / or the length of the second side edge of the valve can basically correspond to the length of the second boundary edge. In the first position of the flap, for example, the first side edge can be opposite a boundary edge, in particular a first boundary edge, and optionally directly adjoins and / or is located on the boundary edge. The same applies to the second side edge and the second boundary edge.

[0026] Here, the shielding wall can be designed to be flexible. In other words, here, the shielding wall should not be a rigid wall. The shielding wall can be provided by a thin-walled element, for example, by a thin-walled metal sheet or metal strip or other material strip or film, etc.

[0027] In another advantageous embodiment of the present invention, at least one connecting element is a shielding wall, which is designed as a foldable shielding wall, which has a folded state in the first position of the shutter and a second state in the second position, which is unfolded relative to the first state. In the second position, the foldable shielding wall does not have to be fully unfolded, that is, it does not have to be completely flat, but this is nevertheless possible. As a result, the shielding wall takes up very little structural space, especially when the shutter is in the first position, because in this position the shielding wall is folded in a way that saves structural space. When the shutter is opened, that is, when transitioning to the second position, the shielding wall automatically unfolds due to the movement of the shutter and assumes its lateral shielding function. The same situation can also apply to the second opposite connecting element. As a result, lateral shielding functions on both sides are provided in an advantageous manner.

[0028] Here, the design of the connecting element as a shielding wall can be combined with the design as a spring element. In other words, the connecting element, i.e. the first connecting element and / or the second connecting element, can include not only a spring element but also a shielding wall constructed as the described shielding wall. The shielding wall itself is designed to be unable to provide a restoring force. Therefore, if necessary, a spring element can be additionally provided as part of the connecting element. It can also be provided that the first connecting element is designed as a shielding wall or includes such a shielding wall, and the second connecting element is designed as a spring element or includes such a spring element.

[0029] In another advantageous embodiment of the present invention, the valve is fixed in the first position by means of a fixing device, wherein the fixing device can be released by opening the openable battery cell exhaust port and / or by gas pressure acting on the valve from the direction of the battery cell exhaust port. By means of such a fixing device, the valve can be reliably held in the first position. Thus, a particularly good protection function is provided for the intact battery cell exhaust port. By means of the fixing device, when gas is discharged from the battery cell, it is possible to reliably open the valve. For example, the fixing device can be provided by means of an adhesive. For example, the valve can be locally bonded to the base element. Therefore, the fixing device can be provided by a material-locked connection between the valve and the base element. When the gas is discharged, the adhesive seam provided by the adhesive can be broken and the valve can be opened thereby.

[0030] According to another advantageous embodiment of the invention, the gas guiding device is arranged only on the battery cell, in particular is glued and / or snapped onto the battery cell. Preferably, the base element of the gas guiding device is glued and / or snapped onto the cell housing of the battery cell. Providing a gas guiding device for each battery cell has the great advantage that the arrangement of the gas guiding device on such a battery cell is thereby simplified, since tolerance compensation for different heights of the battery cells and / or for different distances of the battery cells from one another does not have to be provided. Each battery cell can be provided with its own gas guiding device. Advantageously, then, coordination with the geometry or distances to other battery cells does not have to be taken into account.

[0031] In the closed state of the flap, a housing can optionally be provided by the gas-conducting device. The gas-conducting device can then enclose the interior volume, for example, together with a portion of the first housing wall. However, in order to achieve fastening of the gas-conducting device to the cell, the base element can also rest directly on the first housing wall and / or be designed only as a frame surrounding the gas outlet.

[0032] Furthermore, the invention relates to a motor vehicle having a cell assembly according to the invention or one of its embodiments.

[0033] Furthermore, the present invention relates to a battery, in particular a high-voltage battery, having a cell assembly according to the present invention or one of its embodiments. In this case, the battery can have a cell stack comprising a plurality of cell assemblies. In this case, the cells of the corresponding cell assemblies can be arranged side by side in a stacking direction. In this case, the battery can also include a plurality of such cell stacks.

[0034] The invention also includes improvements of the motor vehicle according to the invention and of the battery according to the invention, which have the features already described in conjunction with the improvements of the cell assembly according to the invention. For this reason, the corresponding improvements of the motor vehicle according to the invention and of the battery according to the invention will not be described again here.

[0035] The motor vehicle according to the invention is preferably designed as a car, in particular as a passenger car or a commercial vehicle, or as a bus or a motorcycle.

[0036] The invention also includes combinations of features of the described embodiments. Therefore, the invention also includes implementations which each have a combination of features of a plurality of the described embodiments, as long as these embodiments are not described as mutually exclusive. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The following describes an embodiment of the present invention. It is shown here:

[0038] Figure 1A schematic perspective view showing a battery having a plurality of battery cell assemblies according to one embodiment of the present invention; and

[0039] Figure 2 A schematic diagram of a battery having a plurality of battery cell assemblies according to another embodiment of the present invention is shown. DETAILED DESCRIPTION

[0040] The embodiments described below are preferred embodiments of the present invention. In the embodiments, the described components of the embodiments are respectively individual features of the present invention that can be regarded as independent of each other, and these features also improve the present invention independently of each other. Therefore, the present disclosure should also include feature combinations that are different from the illustrated embodiment feature combinations. In addition, the embodiments may also be supplemented by other features in the already described features of the present invention.

[0041] In the figures, the same reference numerals respectively denote elements with the same function.

[0042] Figure 1 A schematic diagram of a battery 10 with a plurality of cell assemblies 12 according to one exemplary embodiment of the present invention is shown. In this case, each cell assembly 12 comprises a cell 14, which is designed in the present case as a prismatic cell, and a gas conducting device 16 arranged at the associated cell 14. In this case, the battery 10 can include a cell stack 18, which in turn includes the cells 14. In this case, the cells 14 can be arranged side by side in a stacking direction, wherein the stacking direction corresponds to the x direction shown.

[0043] In addition, Figure 1 and Figure 2 , respectively, and the coordinate system is a Cartesian coordinate system. Here, the aforementioned first direction may correspond to the z direction shown, and the aforementioned second direction may correspond to the x direction shown. Here, the y direction is defined perpendicular to the x direction and the z direction shown.

[0044] In this case, the cell assemblies 12 may be designed to be identical or similar, so that the following description related to such cell assemblies 12 may apply analogously to the other cell assemblies 12 .

[0045] In this case, the cell 14 has a cell housing 20, which comprises a first housing side 20a. An openable cell vent 22 is arranged in the first housing side 20a. The cell vent is closed in the normal state and can be opened depending on the pressure in order to enable the cell 14 to be vented. The gas guiding device 16 comprises a base element 24, which is fastened to the cell 14, in particular to the cell housing 20 of the cell. In this case, the base element 24 is arranged on the first housing wall 20a. The base element 24 can be glued or snapped onto the cell housing 20, for example. In addition, the gas guiding device 16 comprises a flap 26, which can assume at least a first position P1 and a second position P2. For the cell assembly 12, which is also currently indicated as 12a, the flap 26 is shown in the second position P2, while the flap 26 of the remaining cell assembly 12, which is also indicated as 12b, is in the first position P1. Generally speaking, the valve 26 has a first end region 26a and a second end region 26b opposite to the first end region. In addition, the valve 26 includes a first side edge 26c and a second side edge 26d opposite to the first side edge 26c. Here, the two side edges 26c, 26d respectively connect the first end region 26a and the second end region 26b of the valve 26.

[0046] An openable gas outlet 28 is arranged in the base element 24. If the valve 26 is in the first position P1, the valve 26 closes the openable gas outlet 28 and simultaneously covers the openable battery cell exhaust port 22. In the second position P2 of the valve 26, the gas outlet 28 is opened. As a result, the gas discharged through the battery cell exhaust port 22 can escape through the gas outlet 28. At this time, in particular, the gas discharged from the battery cell exhaust port 22 causes the valve 26 to open automatically and passively due to the pressure applied by the gas to the valve 26. At this time, the second end region 26b of the valve 26 remains on the base element 24, that is, the second end region is arranged on the base element 24 not only in the first position P1, but also in the second position P2, and in any intermediate position occupied by the valve 26 when transitioning from the first position P1 to the second position P2.

[0047] Advantageously, the gas guiding device 16 has at least one deformable connecting element 30a, 30b, which in this example is designed as a spring element 32a, 32b. In particular, in this example, the gas guiding device 16 comprises two such connecting elements, namely a first connecting element 30a and a second connecting element 30b, which are each designed as a spring element 32a, 32b. In this case, the first spring element 32a is arranged on the first side edge 26c, in this example, in particular at the corner where the first side edge 26c and the first end region 26a meet, and the second spring element 32b is arranged on the second side edge 26d, in particular at the corner where the second side edge 26d meets the first end region 26a. In addition, the two spring elements 32a, 32b are arranged on the base element 24. Here, the first spring element 32a is arranged with the opposite ends on the first boundary edge 24a of the base element 24 limiting the openable outlet 28, and the second spring element 32b is arranged on the second boundary edge 24b of the base element 24 limiting the gas outlet 28 on the opposite side. In particular, the spring elements 32a, 32b are arranged again on the respective corners of the respective boundary edges 24a, 24b adjoining the other boundary edge 24c of the base element 24. Thus, the spring elements 32a, 32b are arranged with their respective ends facing the base element 24 on the ends of the two boundary edges 24a, 24b facing away from the second end region 26b. As a result, the holding effect on the shutter 26 provided by the connecting elements 30a, 30b in the second position P2 can be optimized. Here, the connecting elements 30a, 30b can define for the shutter 26 the maximum opening angle α that the shutter has in the second position P2. In the present example, the valve 26 has an inclination in the second position P2 relative to the plane in which the opened gas outlet 28 is located, wherein the plane is currently parallel to the xy plane shown. This inclination advantageously achieves that, on the one hand, the gas flow discharged from the battery cell 14 is deflected by means of the valve 26 and, on the other hand, the gas flow is shielded in the opposite direction. In the present example, the discharged gas flow can be diverted, for example, in the opposite direction to the y direction by means of the valve 26. It can thus be avoided that most of the outflowing gas flows in the x direction or in the opposite direction to the x direction to the adjacent battery cell 14. The adjacent battery cell is additionally protected by the valve 26, which is also closed. If the discharged gas flow is reduced, the valve 26 can be reset in the direction of its first position P1 or even in its first position P1 by means of the spring elements 32a, 32b.

[0048] Thus, a defined venting region of an element, ie a cell assembly 12 , is provided with a flexible element, namely a flap 26 , which allows free opening during a fault and simultaneously prevents a gas flow in the opposite direction.

[0049] The barrier provided by the gas deflection device 16, in particular by the open flap 26, which acts only in one direction, minimizes the flow resistance during the venting process. At the same time, the flow in the opposite direction and thus the heat load can be kept away from the galvanic cells, in particular the adjacent cells 14. In addition, this design allows the outflow resistance to be adjusted and the protection in the opposite direction to be provided. In addition, the possibility of deflecting the gas flow and thus keeping the influence of faults on the battery 10 low is provided.

[0050] Therefore, in this example, the secondary cell, currently referred to as the cell 14, is equipped with an opening element, i.e. an openable cell vent 22, which opens in a pressure- and / or temperature-sensitive manner and thus allows venting in the event of a fault. A protective element in the form of a valve 26 is present above the opening element in a covered manner, which opens in a pressure-controlled manner by preloaded spring elements 32a, 32b and releases gas into the surrounding battery cavity. The protective element, that is to say the valve 26, is preferably made of a highly heat-resistant material and thus makes it possible to protect the adjacent secondary cells 14 from the hot gas of the damaged secondary cell 14 in the event of a fault. In addition, the structure makes it possible to guide the outflowing gas.

[0051] Figure 2 1 is a schematic diagram of a battery 10 according to another embodiment of the present invention. Figure 1 The gas deflection device 16 is constructed as described, except for the differences described below. In this case, the differences essentially relate to the design of the gas deflection device 16. In this example, the gas deflection device also includes a valve 26, which can occupy the following positions: Figure 1 The first position P1 and the second position P2 are defined. Here, the basic element 24 of the gas deflection device 16 can be provided by a part of the first housing wall 20a of the cell housing 20 itself, that is, the valve 26 can be arranged directly on the first housing wall 20a, or the basic element 24 can be provided in the form of a plate having an opening in the area of ​​the openable cell exhaust port 22 on the first housing wall 20a arranged directly, or can be provided only in the form of a frame extending along the contour line indicated by 24'.

[0052] In this example, two connecting elements 30a, 30b are provided in the form of two foldable shielding walls 34a, 34b. The connecting elements are fastened to the corresponding side edges 26c, 26d on the one hand, and to the two boundary edges 24a, 24b that limit the openable gas outlet 28 on the other hand. The first side edge 26c and the first boundary edge 24a form an imaginary first face A, which is covered by the foldable first shielding wall 34a in the second position P2 of the valve, and the second side edge 26d and the second boundary edge 24b form an imaginary other face A, which is covered by the foldable second shielding wall 34b when the valve 26 is in the second position P2. In the first position P1 of the valve 26, the corresponding foldable shielding walls 34a, 34b are folded up, as shown for the battery cell assembly 12b. Here, the folding edges of the corresponding shielding walls 34a, 34b are represented by 34a' and 34b'. In this case, more than just one individual fold edge 34 a ′, 34 b ′ may also be provided for each foldable shielding wall 34 a , 34 b .

[0053] In this example, the secondary cell, that is to say the cell 14, is again equipped with an opening element, which is provided by an openable cell exhaust port 22, and which opens in a pressure- and / or temperature-sensitive manner and thereby allows exhaust in the event of a fault. A protective element, that is, a gas guiding device 16 having a valve 26, is again located above the opening element in a covered manner, and in the closed state P1, the protective element has a folded structure. The protective element, in particular the shielding walls 34a, 34b included therein, is unfolded by pressure loading, and the gas flow is released during a fault. The protective element, that is to say the gas guiding device 16, is preferably made of a highly heat-resistant material, and thereby enables the adjacent secondary cell 14 to be protected from the hot gas of the damaged secondary cell 14 in the event of a fault. In addition, the structure enables the guiding of the outflowing gas.

[0054] In this example, the shielding walls 34a, 34b can also define a maximum opening angle α for the shutter 26 in the second position P2. Thereby, the shutter 26 can be stably held in its second position P2.

[0055] In summary, the example shows how a degassing barrier for one-sided insulation of a galvanic cell can be provided by the invention.

Claims

1. A battery cell assembly (12) having a gas guiding device (16), wherein: The battery cell assembly (12) comprises a battery cell (14), wherein the battery cell comprises a battery cell housing (20), wherein the battery cell housing comprises a first housing wall (20a) and an openable battery cell exhaust port (22) arranged in the first housing wall (20a). the gas-conducting device (16) comprises a base element (24) arranged on the cell housing (20), - has an openable gas outlet in the base element (24), - comprising a valve (26) arranged on the base element (24), which in a first position (P1) closes the openable gas outlet (28) and covers the cell exhaust opening (22), wherein the flap (26) can be moved into a second, flipped-open position (P2) in which the gas outlet (28) is opened, - wherein the valve (26) has a first end region (26a) which is disengaged from the base element (24) in the second position (P2) and a second end region (26b) which is opposite to the first end region (26a), and the second end region is located on the base element (24) in the second position (P2), the valve comprising a first side edge (26c, 26d) and a second side edge (26d, 26c) which is opposite to the first side edge, and the side edges extend from the first end region (26a) to the second end region (26b), respectively, It is characterized in that The gas guiding device (16) comprises at least one first deformable connecting element (30a, 30b, 32a, 32b, 34a, 34b) which connects the valve (26) to the base element (24) in a first valve region of the valve (26) different from the second end region (26b).

2. The battery cell assembly (12) according to claim 1, It is characterized in that The flap (26) can be moved from a first position (P1) into a second position (P2) by bending in a second end region (26b), in particular wherein the second end region (26a) of the flap (26) is connected to the base element (24) in a materially bonded manner.

3. The battery cell assembly (12) according to any one of the preceding claims, It is characterized in that The gas guiding device (16) is designed so that the valve (26) has an inclination in the second position (P2) relative to the opening plane where the opened gas outlet (28) is located, and the valve (26) is in a discharge path passing through the gas outlet (28) and perpendicular to the opening plane, in particular, wherein the second position (P2) of the valve (26) is the maximum open position of the valve (26), and the at least one first connecting element (30a, 30b, 32a, 32b, 34a, 34b) specifies the maximum opening angle (α) of the valve (26) in the second position (P2), and the maximum opening angle is in particular less than 90°.

4. The battery cell assembly (12) according to any one of the preceding claims, It is characterized in that The gas guiding device (16) has at least one deformable second connecting element (30b, 30a, 32b, 32a, 34b, 34a), which connects the valve (26) to the base element (24) in a second valve area of ​​the valve (26) different from the second end area (26b) and the first valve area, in particular, wherein the first valve area includes a first side edge (26c, 26d) and the second valve area includes a second side edge (26d, 26c).

5. The battery cell assembly (12) according to any one of the preceding claims, It is characterized in that The at least one first connecting element (30a, 30b, 32a, 32b) is a spring element (32a, 32b) which is designed to exert a restoring force on the flap (26) in the second position (P2) for returning the flap (26) to the first position (P1).

6. The battery cell assembly (12) according to any one of the preceding claims, It is characterized in that The at least one first connecting element (30a, 30b, 34a, 34b) provides a shielding wall (34a, 34b) in the second position (P2) of the valve (26), which shielding wall partially, mostly or completely covers an imaginary side (A) that is spanned by a first side edge (26c, 26d) of the valve (26) and a corresponding boundary edge (24a, 24b) of the base element (24) that limits the openable gas outlet (28).

7. The battery cell assembly (12) according to any one of the preceding claims, It is characterized in that The at least one first connecting element (30a, 30b, 34a, 34b) is a shielding wall (34a, 34b), which is designed as a foldable shielding wall (34a, 34b), which has a folded state in a first position (P1) of the valve (26) and a second state that is unfolded relative to the first state in a second position (P2).

8. The battery cell assembly (12) according to any one of the preceding claims, It is characterized in that The valve (26) is fixed in a first position (P1) by means of a fixing device, wherein the fixing device can be released by opening an openable battery cell exhaust port (22) and / or by gas pressure acting on the valve (26) from the direction of the battery cell exhaust port (22).

9. The battery cell assembly (12) according to any one of the preceding claims, It is characterized in that The gas conducting device (16) is merely arranged on the battery cell (14), in particular is adhesively bonded and / or clipped onto the battery cell (14).

10. A motor vehicle having a cell assembly (12) according to any one of the preceding claims.

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